Synlink Technology Co,Ltd. was established to mainly explore European market, a greatly potential market. There are huge demands for Intelligent LCD module in Europe. Synlink participated in "embedded world" trade fair at Nuremberg held from Mar.3, 2010 to Mar.5, 2010. During the trade fair, hundreds of customers showed much interest in our product, not only for the competitive price, but also for the powerful performance. Besides to explore market, we also provide some HMI solution to customers, if requested. That is to say, we can provide complete design plan for HMI as we have some experienced technical persons for this service.
Compared with the competitors, our Intelligent LCD modules sells much better due to the following reasons:
1. Leading technology. This is related to our know-how.
A. Unique drive module. It is a patent product. Because of this, any engineer can finish HMI design with little time as he does not have to study how to drive the TFT and control TFT. The only thing that the engineers need to do is just control our module. So, it will help our customers to shorten development time and lower development cost. Until now, four generations are available.
B. Touch panel technology, which leads to longer life span of the screen, at least three years longer. That is from the accurate algorithm, low power/voltage and self-designed MCU.
C. Accurate algorithm about some data, which results in its excellent reliability. It also obtained patent.
2. Perfect QA plan which is loyally carried out by production and quality control sectors.
3. Price. It has something to do with our scale.
4. Management. Good management is up to an outstanding leader and his leading strategy. Mr.Wang, as the top leader of this company, always makes everyone feel like being at home, which arouse our unbeatable enthusiasm for working with powerful executive ability.
Due to the above-mentioned advantages, we are developing at an amazing speed from nothing. Currently, our Intelligent LCD module occupies 70% of similar product in China and the rate will be higher for sure in the future.
2011年5月31日星期二
Technical features of graphic lcd module
Since our graphic serial LCD becomes more and more popular in USA, a powerful distributor seems very urgent. Undoubtedly, having a basic understanding about our graphic serial LCD is the precondition. The outstanding technical characteristics of the graphic serial LCD are as follows:
1 Reading-protection
FEC coding and interleave processing are done on the pictures by our software before they
are stored, so the pictures finally stored in our flash are greatly different from the original ones.
That is to say, it is impossible for the others to decode the data. It is good for protecting
customers?intellectual property. Furthermore, one of Germany customers whose product is for
banks, requested us to add a "User password" in the graphic serial LCD because the
customer is worried that the communication between the CPU and graphic Serial LCD will be
attacked by the third party. In this way, some confidential information will be revealed.
2 Low power consumption
After our calculation, more than 70% power will be saved, compared with other industrial
control PCB.
3 All of our graphic serial LCD share the same commands.
When there is software upgrade, our display will show strong compatibility. Besides, the
commands are very easy and practicable.
4 Reliable.
Terminal Assistant, software developed by Dwin technical staff, completely free from bug is
the guarantee for the performance.
5 Stable.
Our graphic serial LCD is with strong anti-jamming ability when the working temperature:
-20-70 degree centigrade.
6 Extremely low back repair rate.
The back repair rate is lower than 0.5%. There is only one person in charge of back repair. It
means something. Take Sany group as an example. It is reported that the back repair rate of
our products are lower than 1%, including physical damages, while the percentage is 7.8% for
similar products.
7 Big memory space.
In general, our flash is about 128 megabyte.
1 Reading-protection
FEC coding and interleave processing are done on the pictures by our software before they
are stored, so the pictures finally stored in our flash are greatly different from the original ones.
That is to say, it is impossible for the others to decode the data. It is good for protecting
customers?intellectual property. Furthermore, one of Germany customers whose product is for
banks, requested us to add a "User password" in the graphic serial LCD because the
customer is worried that the communication between the CPU and graphic Serial LCD will be
attacked by the third party. In this way, some confidential information will be revealed.
2 Low power consumption
After our calculation, more than 70% power will be saved, compared with other industrial
control PCB.
3 All of our graphic serial LCD share the same commands.
When there is software upgrade, our display will show strong compatibility. Besides, the
commands are very easy and practicable.
4 Reliable.
Terminal Assistant, software developed by Dwin technical staff, completely free from bug is
the guarantee for the performance.
5 Stable.
Our graphic serial LCD is with strong anti-jamming ability when the working temperature:
-20-70 degree centigrade.
6 Extremely low back repair rate.
The back repair rate is lower than 0.5%. There is only one person in charge of back repair. It
means something. Take Sany group as an example. It is reported that the back repair rate of
our products are lower than 1%, including physical damages, while the percentage is 7.8% for
similar products.
7 Big memory space.
In general, our flash is about 128 megabyte.
2011年5月30日星期一
Touch-screen display module in the quality of Newton's ring defects and corrective and preventive measures
In the resistive touch screen and liquid crystal display production process, the Newton ring (some manufacturers also called rainbow pattern, or simply called the Rainbow) drifting like a ghost in the workshop, accidentally, from time to time it with the customer in the production occur during use, made to do a lot of site management in the workshop process and technical personnel captivated. Not because it is too beautiful rainbow, but the quality of this beautiful killer, in the current industry, too easy to trouble, let someone else a fine Yan finds fault.
In the display module, the Newton ring region appears as the underlying reason why the interference of light, color overlay which will cause color errors leading to the final show, on the other hand, also reduced the display contrast of the region, it is mainly as a fatal defects in the column set.
First, the mechanism of Newton's rings
We know, whether it is resistive touch screen, or liquid crystal displays, are two of the main support piece of ITO glass or ITO glass, a piece of ITO FILM, if there are side material generated deformation, the inner surface of ITO materials to produce a radius of curvature of the surface, with the usual physical optics in the generation of about Newton ring convex lens surface and the plane mirrors effect is the same, Newton ring is also reflected in the relatively light because of the two surfaces reflect light and incident light wavelength of optical path difference and the relationship between. It is the same, because the optical path difference will increase, that is, the distance between the surfaces increases the distance between Newton's rings will increase.
In the actual production process, regardless of Ye Hao resistive touch screen, LCD Ye Hao, will support the frame at the distance farther than the middle of the gap slightly larger, slightly worse if the process parameters from, then the distance difference would not be able to eliminate, so let the two surfaces have a certain inward sag in the middle, so that the light in the two optical path difference between the surface will produce not the same as in the incident light and reflected light interfere with each other process, to will be according to different optical path difference selected different wavelength region out, revealing the color of the corresponding wavelength.
Second, the actual production of local produce Newton rings and why
In the liquid crystal display module, there are three areas most prone to Newton's rings:
1, the liquid crystal display internally generated rainbow.
LCD module cell thickness of 10 microns are generally, if the number of particles is not enough space inside, or uneven, or the space frame and the particle diameter of the internal support is not suitable for workshops with the design process, will have a rainbow defects. Another major cause of that process into the box, the box is more than the diameter of space particles contaminated by foreign objects, which is the liquid crystal display plant for clean environment is very strict control of reason.
2, the liquid crystal display with resistive touch screen between the ripples (also known as Watermark)
The water ripples, the same is in one of Newton's rings, especially the resistive touch screen action, the added resistance to outside pressure on the touch screen resistive touch screen caused by bending under the surface, it will change with the intensity of Newton rings will move the color radius, generate or disappear, just like stones dropped into the water, like ripples of water produced, so this is also called Newton's rings ripple or watermarks, will be shown with the location and movement action and change the pressure .
3, the resistive touch screen inside the Newton rings (also called rainbow pattern)
Resistive Touch Screen in the production process, in order to produce a touch deformation region, the height of the general outline of the support points are much higher than inside, water-based glue to do if the printed words of frame, generally 50 to 70 microns in height so; If you are using double-sided adhesive PET substrate, the general is also more than 50 microns, while the inside of the support points, generally less than 25 microns, using 30 to 45 microns in diameter, DOT, the forming height of the last strong point, only 15 ~ 25 microns.
With resistive touch screen operation surface, the same region in order to produce a deformation of touch, usually ITO FILM, the material is flexible. Thus, if the production control process parameters inaccurate, do not move operation, in the product by the middle part of the ITO FILM, will collapse of its own, attached to the anchor, the produce surface deformation, so that light rays with the inner surface of the two ITO negative light to produce interference, they formed a Newton ring.
Third, how to measure to prevent Newton rings produced by the design parameters
In actual production, how to effectively prevent the generation of Newton's rings, the same optical ring according to Newton's law of prevention.
In the beginning we began to design products that can be based on product dimensions, calculate the height of the inner and outer box, how much value is, the Newton ring inner radius of the dark ring, would fall outside the product size, so you can optimize the parameters of their own design . (How to calculate and principles of the formula may refer to Annex "equal thickness interference experiment").
Of course, the above validation of this approach is a theoretical fact, if calculated in accordance with the real data, we can not make the customer demand for products, but this calculation, you can guide us in the production, how best to close to the theoretical values .
Some would say that it does not accurately calculated, the production can not be avoided, there is no better way yet? Have, or refer to the attached "equal thickness interference experiment" approach, with a microscope or a micrometer to measure the deformation of your shift down on the number of films, the Newton ring appeared, and then calculate your Newton rings appear in the middle of the smallest particles or the thickness of the supporting space, if together with the pressure gauge with, but also to measure the product of Newton rings occur when the pressure is. Therefore, problems, start testing methods demonstrated, from the experimental data to validate, from process parameters on the adjustment.
Fourth, how to prevent Newton rings from craft production
1, the liquid crystal display of the rainbow
Rainbow defects can quickly find the source of a microscope, if it is point-like, you can see under the microscope in three ways: a small number of particles in space, space particles agglomerate together, foreign body inside the box. Such defects, according to observations on, you can adjust the front right from the parameter space particle spreader, spreading segment and the combination of space particles and clean maintenance section both for prevention.
If the liquid crystal display are a rainbow, it is either within the space frame and the particle with the wrong box, or the number of particles is not enough space inside the box or not. Such defects, may check the spreading of the technology space particles in front of the material parameters, particle detection data, adjust the parameters for prevention.
If the frame is a box near the rainbow, or a frame packaging material contaminated by foreign bodies can be seen from the microscope, either into the box caused all Shouli Bu, need to check into the box equipment and maintenance. Into a box equipment failure, or in case of a foreign body caused by the process of the rainbow folder will also in the adjacent produce the same place a few slices of Newton ring product, that there will be regular.
2, the resistive touch screen and LCD ripples between
To prevent water wave generation, firstly, to increase the intensity of resistive touch screen, for example, the original PC substrate is replaced by a greater pressure force afterburner or glass material, or from thin substrate, and replaced thick substrate. This is why more than a certain size resistive touch screen products will use 2MM glass thickness of glass or one of the reasons. All design parameters are justified, and not copying from the outside will be able to blind copy, if the unknown principle of blind copy, or a waste of materials and quality of your costs, or can not avoid their potential yield and product quality defects rate.
Second is to meet customer requirements in the case of resistive touch screen and liquid crystal display assembly of double-sided adhesive used between the thicker the thickness of the ring to move the Newton ring product size dark outside. Or resistive touch screen and LCD monitors are also printed on the assembly side support and the transfer of the external pressure to the liquid crystal display through the anchor and the housing board to reduce the resistive touch screen of the deformation, to prevent Newton rings, which is a wavy generated.
If the display of products to meet the demand, in terms acceptable to display, can also resistive touch screen surface combined with the liquid crystal display on the LCD monitor glare polarizer into the polarizer. Note that the close-glare polarizer polarizer display display than the average lot worse, especially over QVGA LCD display, if replaced, the display of detail design, response speed and contrast, are significantly decreased, so the end customer must determine the display before replacement.
3, the resistive touch screen of the Newton ring
Resistive touch screen it does to Newton ring prevention of trouble, because most of the operation of resistive touch screen surface, using a flexible ITO FILM substrate.
Resistive touch screen to prevent Newton rings, first in the ITO FILM quenching process, the choice of a good governance for their own tooling and equipment for modified treatment parameters, so that all parts of ITO FILM synchronous contraction, no contraction due to uneven produced uneven, or on the loading fixture is not transferred to the ITO FILM on the flat. The quenching by ITO FILM generated do not ring, has a very distinctive features, if it is combined and then fractionated products, after a good portfolio can not see the ring, but in the product 48 hours after the sub-grain left will appear.
Support points of the high degree of control is the main way to prevent Newton's rings by the above calculation, we can see that, to survive on the height above a certain value, it will be difficult to form the, or are widely spaced to be diluted So we must guarantee the anchor height.
Height of the supporting affirmation and support points attached to the area have a certain relationship, in the same conditions, the higher the altitude, the greater the support points attached to the area, for some fine-quality liquid crystal displays, the pixel size may be only 60 to 90 microns, the size if a strong point after more than half the size of pixels, then the pixel will have a display distortion, observed at a distance, can the layout of the support points emerge from the display screen. To solve this problem, the Japanese manufacturers in the narrow design of the small size products, the use of molds or add gasket combination, which allows the product filled the air, man-made increased the distance between the inner surface of products that avoid the appearance of Newton's rings , would not have to frame design is very complex and difficult to produce a ventilation channel, but also can design the anchor attached to a small area.
Defects in the way inflation is not used in the temperature environment of rapid change, or large-size products. In particular, water-based adhesive printed products, as design is narrow, and difficult to operate, resulting in lack of bond strength. After the drastic changes in temperature, it is likely to cause leakage, gas leakage, the effect is gone to avoid Newton's rings. Many manufacturers of products in the factory warehouse on their own thermostat there is no problem, get the customer's normal storage place for a week, or simply just after a motor transport, the product of Newton's ring phenomenon occurs, that is the reason. So inflation is not to deal with Newton's rings the traditional remedy of a fresh recruit, use of the product if you do not consider the conditions and environment, together with other auxiliary craft with it, would not achieve a real effect.
Resistive touch screen sensitive areas of the ring, the same material thickness is a combination of various techniques and hot temperature and pressure parameters of inappropriate FPC generated, basically you can adjust the thickness of FPC materials and hot pressing parameters can be resolved.
For those watching from the distant large-size display products, because the pixel size is relatively large, can use 50 to 60 micron size of the support points, support points unless it is printed or anchor a high degree of uneven subsidence, generally does not appear Newton ring phenomenon.
V. Conclusion
Newton's rings, nothing more than parallel to the incident light and reflected light generated by mutual interference, such interference is only within a certain optical path difference will be revealed. To avoid the generation of Newton's rings, one approach is to disrupt the direction of light propagation, such as in resistive touch screen, use matte ITO FILM; in LCM polarizing films such as the use of glare; Another way is to ensure that the parallel surfaces, so that the radius of curvature within the table is large enough so that the dark Newton ring expansion to the product outside the loop region; there is greater difference between the two surfaces of the optical path, so that Newton's ring area falls on the dark ring Size Newton ring outside or to increase the distance between adjacent rings, dilute Newton rings. As long as the generation mechanism based on Newton's rings, in the production process to control the quality of Newton's rings is not a ghost.
In the display module, the Newton ring region appears as the underlying reason why the interference of light, color overlay which will cause color errors leading to the final show, on the other hand, also reduced the display contrast of the region, it is mainly as a fatal defects in the column set.
First, the mechanism of Newton's rings
We know, whether it is resistive touch screen, or liquid crystal displays, are two of the main support piece of ITO glass or ITO glass, a piece of ITO FILM, if there are side material generated deformation, the inner surface of ITO materials to produce a radius of curvature of the surface, with the usual physical optics in the generation of about Newton ring convex lens surface and the plane mirrors effect is the same, Newton ring is also reflected in the relatively light because of the two surfaces reflect light and incident light wavelength of optical path difference and the relationship between. It is the same, because the optical path difference will increase, that is, the distance between the surfaces increases the distance between Newton's rings will increase.
In the actual production process, regardless of Ye Hao resistive touch screen, LCD Ye Hao, will support the frame at the distance farther than the middle of the gap slightly larger, slightly worse if the process parameters from, then the distance difference would not be able to eliminate, so let the two surfaces have a certain inward sag in the middle, so that the light in the two optical path difference between the surface will produce not the same as in the incident light and reflected light interfere with each other process, to will be according to different optical path difference selected different wavelength region out, revealing the color of the corresponding wavelength.
Second, the actual production of local produce Newton rings and why
In the liquid crystal display module, there are three areas most prone to Newton's rings:
1, the liquid crystal display internally generated rainbow.
LCD module cell thickness of 10 microns are generally, if the number of particles is not enough space inside, or uneven, or the space frame and the particle diameter of the internal support is not suitable for workshops with the design process, will have a rainbow defects. Another major cause of that process into the box, the box is more than the diameter of space particles contaminated by foreign objects, which is the liquid crystal display plant for clean environment is very strict control of reason.
2, the liquid crystal display with resistive touch screen between the ripples (also known as Watermark)
The water ripples, the same is in one of Newton's rings, especially the resistive touch screen action, the added resistance to outside pressure on the touch screen resistive touch screen caused by bending under the surface, it will change with the intensity of Newton rings will move the color radius, generate or disappear, just like stones dropped into the water, like ripples of water produced, so this is also called Newton's rings ripple or watermarks, will be shown with the location and movement action and change the pressure .
3, the resistive touch screen inside the Newton rings (also called rainbow pattern)
Resistive Touch Screen in the production process, in order to produce a touch deformation region, the height of the general outline of the support points are much higher than inside, water-based glue to do if the printed words of frame, generally 50 to 70 microns in height so; If you are using double-sided adhesive PET substrate, the general is also more than 50 microns, while the inside of the support points, generally less than 25 microns, using 30 to 45 microns in diameter, DOT, the forming height of the last strong point, only 15 ~ 25 microns.
With resistive touch screen operation surface, the same region in order to produce a deformation of touch, usually ITO FILM, the material is flexible. Thus, if the production control process parameters inaccurate, do not move operation, in the product by the middle part of the ITO FILM, will collapse of its own, attached to the anchor, the produce surface deformation, so that light rays with the inner surface of the two ITO negative light to produce interference, they formed a Newton ring.
Third, how to measure to prevent Newton rings produced by the design parameters
In actual production, how to effectively prevent the generation of Newton's rings, the same optical ring according to Newton's law of prevention.
In the beginning we began to design products that can be based on product dimensions, calculate the height of the inner and outer box, how much value is, the Newton ring inner radius of the dark ring, would fall outside the product size, so you can optimize the parameters of their own design . (How to calculate and principles of the formula may refer to Annex "equal thickness interference experiment").
Of course, the above validation of this approach is a theoretical fact, if calculated in accordance with the real data, we can not make the customer demand for products, but this calculation, you can guide us in the production, how best to close to the theoretical values .
Some would say that it does not accurately calculated, the production can not be avoided, there is no better way yet? Have, or refer to the attached "equal thickness interference experiment" approach, with a microscope or a micrometer to measure the deformation of your shift down on the number of films, the Newton ring appeared, and then calculate your Newton rings appear in the middle of the smallest particles or the thickness of the supporting space, if together with the pressure gauge with, but also to measure the product of Newton rings occur when the pressure is. Therefore, problems, start testing methods demonstrated, from the experimental data to validate, from process parameters on the adjustment.
Fourth, how to prevent Newton rings from craft production
1, the liquid crystal display of the rainbow
Rainbow defects can quickly find the source of a microscope, if it is point-like, you can see under the microscope in three ways: a small number of particles in space, space particles agglomerate together, foreign body inside the box. Such defects, according to observations on, you can adjust the front right from the parameter space particle spreader, spreading segment and the combination of space particles and clean maintenance section both for prevention.
If the liquid crystal display are a rainbow, it is either within the space frame and the particle with the wrong box, or the number of particles is not enough space inside the box or not. Such defects, may check the spreading of the technology space particles in front of the material parameters, particle detection data, adjust the parameters for prevention.
If the frame is a box near the rainbow, or a frame packaging material contaminated by foreign bodies can be seen from the microscope, either into the box caused all Shouli Bu, need to check into the box equipment and maintenance. Into a box equipment failure, or in case of a foreign body caused by the process of the rainbow folder will also in the adjacent produce the same place a few slices of Newton ring product, that there will be regular.
2, the resistive touch screen and LCD ripples between
To prevent water wave generation, firstly, to increase the intensity of resistive touch screen, for example, the original PC substrate is replaced by a greater pressure force afterburner or glass material, or from thin substrate, and replaced thick substrate. This is why more than a certain size resistive touch screen products will use 2MM glass thickness of glass or one of the reasons. All design parameters are justified, and not copying from the outside will be able to blind copy, if the unknown principle of blind copy, or a waste of materials and quality of your costs, or can not avoid their potential yield and product quality defects rate.
Second is to meet customer requirements in the case of resistive touch screen and liquid crystal display assembly of double-sided adhesive used between the thicker the thickness of the ring to move the Newton ring product size dark outside. Or resistive touch screen and LCD monitors are also printed on the assembly side support and the transfer of the external pressure to the liquid crystal display through the anchor and the housing board to reduce the resistive touch screen of the deformation, to prevent Newton rings, which is a wavy generated.
If the display of products to meet the demand, in terms acceptable to display, can also resistive touch screen surface combined with the liquid crystal display on the LCD monitor glare polarizer into the polarizer. Note that the close-glare polarizer polarizer display display than the average lot worse, especially over QVGA LCD display, if replaced, the display of detail design, response speed and contrast, are significantly decreased, so the end customer must determine the display before replacement.
3, the resistive touch screen of the Newton ring
Resistive touch screen it does to Newton ring prevention of trouble, because most of the operation of resistive touch screen surface, using a flexible ITO FILM substrate.
Resistive touch screen to prevent Newton rings, first in the ITO FILM quenching process, the choice of a good governance for their own tooling and equipment for modified treatment parameters, so that all parts of ITO FILM synchronous contraction, no contraction due to uneven produced uneven, or on the loading fixture is not transferred to the ITO FILM on the flat. The quenching by ITO FILM generated do not ring, has a very distinctive features, if it is combined and then fractionated products, after a good portfolio can not see the ring, but in the product 48 hours after the sub-grain left will appear.
Support points of the high degree of control is the main way to prevent Newton's rings by the above calculation, we can see that, to survive on the height above a certain value, it will be difficult to form the, or are widely spaced to be diluted So we must guarantee the anchor height.
Height of the supporting affirmation and support points attached to the area have a certain relationship, in the same conditions, the higher the altitude, the greater the support points attached to the area, for some fine-quality liquid crystal displays, the pixel size may be only 60 to 90 microns, the size if a strong point after more than half the size of pixels, then the pixel will have a display distortion, observed at a distance, can the layout of the support points emerge from the display screen. To solve this problem, the Japanese manufacturers in the narrow design of the small size products, the use of molds or add gasket combination, which allows the product filled the air, man-made increased the distance between the inner surface of products that avoid the appearance of Newton's rings , would not have to frame design is very complex and difficult to produce a ventilation channel, but also can design the anchor attached to a small area.
Defects in the way inflation is not used in the temperature environment of rapid change, or large-size products. In particular, water-based adhesive printed products, as design is narrow, and difficult to operate, resulting in lack of bond strength. After the drastic changes in temperature, it is likely to cause leakage, gas leakage, the effect is gone to avoid Newton's rings. Many manufacturers of products in the factory warehouse on their own thermostat there is no problem, get the customer's normal storage place for a week, or simply just after a motor transport, the product of Newton's ring phenomenon occurs, that is the reason. So inflation is not to deal with Newton's rings the traditional remedy of a fresh recruit, use of the product if you do not consider the conditions and environment, together with other auxiliary craft with it, would not achieve a real effect.
Resistive touch screen sensitive areas of the ring, the same material thickness is a combination of various techniques and hot temperature and pressure parameters of inappropriate FPC generated, basically you can adjust the thickness of FPC materials and hot pressing parameters can be resolved.
For those watching from the distant large-size display products, because the pixel size is relatively large, can use 50 to 60 micron size of the support points, support points unless it is printed or anchor a high degree of uneven subsidence, generally does not appear Newton ring phenomenon.
V. Conclusion
Newton's rings, nothing more than parallel to the incident light and reflected light generated by mutual interference, such interference is only within a certain optical path difference will be revealed. To avoid the generation of Newton's rings, one approach is to disrupt the direction of light propagation, such as in resistive touch screen, use matte ITO FILM; in LCM polarizing films such as the use of glare; Another way is to ensure that the parallel surfaces, so that the radius of curvature within the table is large enough so that the dark Newton ring expansion to the product outside the loop region; there is greater difference between the two surfaces of the optical path, so that Newton's ring area falls on the dark ring Size Newton ring outside or to increase the distance between adjacent rings, dilute Newton rings. As long as the generation mechanism based on Newton's rings, in the production process to control the quality of Newton's rings is not a ghost.
2011年5月29日星期日
Boost computer touch screen software vendors revolution
Boost computer touch screen software vendors revolution, the global module production in 2014 nearly 120 million
According to iSuppli, an independent software vendor (ISV) will certainly thrive in the mobile and desktop PC market, the touch screen to play a central role, to provide differentiated characteristics, which makes the interface technology to attract new users and areas.
iSuppli forecasts that by 2014 a computer touch-screen module for the global production will surge to 117.9 million, while the 2010 is 15.8 million. The figure shows iSuppli company for computer touch-screen projections of global production, including desktop, mobile PC, and slate and tablet computer products.
ISV will be a touch screen key role in the revolution. Intense competition among ISV, have the necessary touch to develop new applications that will help promote the sales of the touch screen device - not only in the consumer field but also in key commercial areas. Whether these applications for Windows 7, Linux, Mac, or the development of a number of mobile operating systems, ISV will drive most of the touch application requirements.
Application focus
Apple introduced the iPhone and the iPod, and now introduced the iPad, first prove that the content is the key to touch the product.
Operating system providers are offering more components, to help people with touch applications, thus driving ISV competition.
Most Popular Tablet PC solutions may not provide the most wide doors that can lead to almost all the content on the network of those solutions, but to provide leads to the door or application-specific solutions, but these applications only through the specific brand or operating system to get. Apple iPad, with its development efforts specifically for the initial success of this approach is a good example. With the introduction of competitor products, is expected to have more focus on specific equipment vendors for application development activities, the attractiveness of the device-specific applications and equipment combined.
As manufacturers strive to differentiate their products, content and devices to access the content in a way, industrial design and products will be equally important.
Business investment in the above additional options, such as touch screen, usually related to productivity. To make the touch-screen sales in the area of substantial growth in business, manufacturers must work closely with the ISV to develop focus on enterprise customers to increase productivity solutions. HP is one touch solutions, one of the market leader, has been in and Priscilla Boston and other software vendors work closely to develop a variety of procedures, as it allows the user to select the wedding program can touch what you can change the wedding colors.
Some business-oriented applications may be cross-platform ISV development, from initial program development for mobile devices, to those used for enterprise and desktop programs. Users to consider various types of devices connected together, and in a more seamless transition between each other.
ISV is expected to promote the new touch-screen technology will also play an important role, while impressive for the application of these technologies.
Easy touch has always been a major consideration for manufacturers, and no doubt make Apple's product selection is projected capacitive technology, the main factor. In this technique, a simple touch can activate the touch option, so users can easily slide on the screen image. In the resistive touch screen, you need to use a larger power tap.
However, projected capacitive technology, the initial number of advantages may be a resistive touch solutions, offset by the advantages: the ability to detect pressure and efforts to provide under a different touch response. The success of digital resistance, will depend largely on application development, and the ISV to how fast the software design in an extra touch to add options, such as pressure testing. Possible future applications include use of stress testing games, music, art or business, this is just one of a few examples.
Resistive touch in the emphasis on business applications, ISV possible to build into a single button multi-function solution that allows users to change the way the touch buttons respond. Touch could open the primary menu, and heavier, you can touch some of the drop-down sub-menu.
With the software vendor mining possibilities inherent pressure sensitivity, such option may be portable touch screen driver PC market in the more important areas of differentiation factors. The favored solution may appear, such as Standum introduced digital resistive touch screen, and the introduction of interpolation Touchco force sensitive resistor (IFSR) technology.
Regional characteristics
ISV preferences in the region may also play an important role. Lenovo will attempt to launch its own Tablet PC LePad to consolidate its leadership position in the Chinese market. LePad plan to run a series of regional application and ISV developers to cooperate with local products for the preparation of the new applications.
serial lcd terminal, graphic terminal display
According to iSuppli, an independent software vendor (ISV) will certainly thrive in the mobile and desktop PC market, the touch screen to play a central role, to provide differentiated characteristics, which makes the interface technology to attract new users and areas.
iSuppli forecasts that by 2014 a computer touch-screen module for the global production will surge to 117.9 million, while the 2010 is 15.8 million. The figure shows iSuppli company for computer touch-screen projections of global production, including desktop, mobile PC, and slate and tablet computer products.
ISV will be a touch screen key role in the revolution. Intense competition among ISV, have the necessary touch to develop new applications that will help promote the sales of the touch screen device - not only in the consumer field but also in key commercial areas. Whether these applications for Windows 7, Linux, Mac, or the development of a number of mobile operating systems, ISV will drive most of the touch application requirements.
Application focus
Apple introduced the iPhone and the iPod, and now introduced the iPad, first prove that the content is the key to touch the product.
Operating system providers are offering more components, to help people with touch applications, thus driving ISV competition.
Most Popular Tablet PC solutions may not provide the most wide doors that can lead to almost all the content on the network of those solutions, but to provide leads to the door or application-specific solutions, but these applications only through the specific brand or operating system to get. Apple iPad, with its development efforts specifically for the initial success of this approach is a good example. With the introduction of competitor products, is expected to have more focus on specific equipment vendors for application development activities, the attractiveness of the device-specific applications and equipment combined.
As manufacturers strive to differentiate their products, content and devices to access the content in a way, industrial design and products will be equally important.
Business investment in the above additional options, such as touch screen, usually related to productivity. To make the touch-screen sales in the area of substantial growth in business, manufacturers must work closely with the ISV to develop focus on enterprise customers to increase productivity solutions. HP is one touch solutions, one of the market leader, has been in and Priscilla Boston and other software vendors work closely to develop a variety of procedures, as it allows the user to select the wedding program can touch what you can change the wedding colors.
Some business-oriented applications may be cross-platform ISV development, from initial program development for mobile devices, to those used for enterprise and desktop programs. Users to consider various types of devices connected together, and in a more seamless transition between each other.
ISV is expected to promote the new touch-screen technology will also play an important role, while impressive for the application of these technologies.
Easy touch has always been a major consideration for manufacturers, and no doubt make Apple's product selection is projected capacitive technology, the main factor. In this technique, a simple touch can activate the touch option, so users can easily slide on the screen image. In the resistive touch screen, you need to use a larger power tap.
However, projected capacitive technology, the initial number of advantages may be a resistive touch solutions, offset by the advantages: the ability to detect pressure and efforts to provide under a different touch response. The success of digital resistance, will depend largely on application development, and the ISV to how fast the software design in an extra touch to add options, such as pressure testing. Possible future applications include use of stress testing games, music, art or business, this is just one of a few examples.
Resistive touch in the emphasis on business applications, ISV possible to build into a single button multi-function solution that allows users to change the way the touch buttons respond. Touch could open the primary menu, and heavier, you can touch some of the drop-down sub-menu.
With the software vendor mining possibilities inherent pressure sensitivity, such option may be portable touch screen driver PC market in the more important areas of differentiation factors. The favored solution may appear, such as Standum introduced digital resistive touch screen, and the introduction of interpolation Touchco force sensitive resistor (IFSR) technology.
Regional characteristics
ISV preferences in the region may also play an important role. Lenovo will attempt to launch its own Tablet PC LePad to consolidate its leadership position in the Chinese market. LePad plan to run a series of regional application and ISV developers to cooperate with local products for the preparation of the new applications.
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2011年5月26日星期四
Use of digital power system management and lower data center power consumption
Management functions with a digital DC / DC converter enables designers to develop a "green" power systems, such power system to meet the target performance, and work processes through re-arranging some of the tasks will be transferred to those who work less than The server (which may be off to other servers) to determine when to reduce overall power consumption.
For years, many companies are carried out on the digital power hype, some companies think: digital power, including digital and a communication link with power. Some other companies, said: Digital power is a kind of a digital pulse-width modulation (PWM) built-chip state machine. There are some manufacturers that: includes a digital power supply to run an algorithm (the algorithm used to compensate for control loop) of the general-purpose digital signal processor (DSP), and only rely on a digital serial bus and can not provide power solutions . There are even other companies that: digital power supply has a state machine or a DSP with digital PWM loop. All of these descriptions can be said to be very puzzled, confused, and some of these methods can not produce good performance. However, in the digital power supply design the right circumstances, it can reduce data center power consumption, shorten product time to market with excellent stability and transient response performance, and improve overall system reliability (such as network equipment in).
Network equipment system designers are faced with upgrading their systems and increase data throughput and performance of functions and features of the pressure. At the same time, how to reduce the system's total power consumption is also necessary to deal with their problems. In the data center, the challenge is that people need to rearrange some of the tasks workflow will be transferred to those who work less than the server (which may be off to other servers) to reduce overall power consumption. To meet these needs, understand the end-user equipment power consumption is very important. Properly designed digital power management system can provide users with power consumption data, so that you can make a flexible energy management decisions.
In today's new electronic system, the state regulator may be the last remaining "blind spots", because generally they do not have the key operating parameters of the direct method of configuration or remote monitoring. For reliable operation, the detection time of the regulator output voltage drift or overheating and accordingly take the appropriate action can be said to be crucial. Well-designed digital power system management (DPSM) program to monitor the performance of the regulator and reported its operation to beyond specification range even in its failure to take corrective action before.
For the DPSM for voltage regulators and power supply design engineers to carefully review the requirements of a learning curve to understand how a computer's graphical user interface (GUI) to complete the programming of such devices and connections. This includes learning new programming software, and each company to provide digital power device has its own unique package. Therefore, we should have a choice after careful thought and a user-friendly software package and the GUI of the company, which is very important. In addition, they should have a reputable technical support staff, the team has such power in the design process to provide the necessary capabilities to help.
Multitrack board power systems
Most embedded systems are powered by a 48V backplane. Usually the voltage step-down to a lower intermediate-bus voltage (typically 12V to 3.3V), circuit boards within the system that support power supply. However, these sub-circuit board or IC need to lower the voltage range of 1V to 3.3V and the dozens to hundreds of A, mA current range operations. Therefore, to the intermediate bus voltage step-down sub-circuit, or IC to the expectations of the required voltage point of load (POL) DC / DC converter is essential. These power rails has a strict ordering, voltage accuracy, margin adjustment and monitoring requirements.
In data communications, telecommunications or storage system, there could be as many as 20 POL voltage rail, system designers need a voltage in accordance with its output, sort, and the maximum allowable current management of these voltage rails simple way. Some processors require the I / O voltage is increased until the voltage at its core, while others require the DSP core voltage of the first of its I / O voltage rises. Power sequencing is also indispensable. Designers need a simple adjustment method to optimize the system performance and storage for each DC / DC converter specific configuration to achieve the purpose of simplifying the design work.
In order to avoid expensive ASIC possibility of being over-voltage conditions, high-speed comparator to monitor the voltage of each supply rail, and beyond the supply rails in a safe operating limits of its range specified to take immediate protective measures. In the digital power supply system, in the event of a fault line through the PMBus alert notification host, and will be off the rails in order for electrical components, such as implemented by ASIC and other protection. Achieve this level of protection needed better accuracy and response time of some tens of μs.
Linear Technology's recently introduced LTC3880/-1 provides a highly accurate digital power system management, and use its high-resolution remote sensing programmability and fast read-back key to achieving real-time control point of load converters, and monitoring functions. The device is a dual output, high efficiency synchronous step-down DC / DC controller with I2C based on the PMBus interface and more than 100 orders and on-board EEPROM. LTC3880/-1 both best in class performance analog switching regulator controller and precision mixed-signal data conversion, can be very easy to implement power system design and management, the device has been based graphical user interface with easy to use (GUI) The LTpowerPlayTM software development system support.
Digital power system management for the control interface
PMBus command language designed to meet the needs of large-scale development of multi-track system is a fully defined command language using the open standard power management protocol that simplifies and power converters, power management devices and the system host processor communication. In addition to a precise definition of the standard commands, consistent with the standard PMBus device also can perform its unique special order, to provide a kind of POLDC / DC converters for programming and monitoring of innovative methods. The agreement with the industry standard SMBus serial interface to perform and achieve power conversion products, programming, control and real-time monitoring. Command language and data format standardization can achieve simple firmware development, thereby speeding up the product to market process. For more information, please visit http://pmbus.org/ website.
LTC3880/-1 programmable control parameters include output voltage margining, current limit, input and output control limits on the power-up sequencing and tracking, switching frequency, identification and traceability data. On-chip EEPROM precision data converters and voltage regulators allow the collection of configuration settings and remote sensing variable values, including the input and output voltage and current, duty cycle, temperature and fault records, and these settings and variables for non-volatile volatile storage. Table 1 lists the following program can be LTC3880/-1 some of the parameters, the high-resolution, remote back to reading skills and alternative solutions.
Analog control loop
LTC3880/-1 is a suitable number of features (for example: output voltage, current limit set point and sorting, etc.) digital programmable DC / DC controller, but it has a loop designed for optimal stability and transient response of the analog feedback control loop, but not the quantitative effects of digital control loop.
Figure 2 shows the feedback control loop analog and digital feedback control loop, the controller IC inside curves of different slopes. Analog loop with a smooth slope, and digital loop is similar to a step function - this will cause stability problems, slowing the speed of transient response and, in some applications, resulting in the need to increase the output capacitor, and digital quantify the effect of the loop will result in increased output ripple.
One of the main advantages of digital power supply is available to predict system failure and the potential to start protective measures, which benefited from the provision of real-time telemetry data. Perhaps the most important point is: with digital management features DC / DC converter enables designers to develop a "green" power system, such a power system to meet the target performance, and be able to rearrange work processes and some Task transferred to those who work less than the server (which may be off to other servers) to determine when to reduce overall power consumption. As the load point, circuit boards, brackets, even the installation of level of energy use very little, thus helping to reduce infrastructure costs and product life cycle total cost of ownership.
Another digital power system management can reduce the design cost advantage and accelerate time to market. By using a intuitive GUI with integrated development environment, you can efficiently develop complex multi-track system. Such systems also through the use of GUI (rather than welding assembly) to adjust and simplify the online test (ICT) and board debugging.
On the definition and benefits of digital power, and now the situation has become confusing. Therefore, the digital power supply is necessary for potential users want to achieve their goals and benefits of digital power system management, the suitability of its products and customers to do investigations. They must determine their own choice of company has a high-performance analog devices, the most popular and easy to use software package, as well as a well-educated, willing to provide the necessary technical support team to help. Fortunately, such companies exist.
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For years, many companies are carried out on the digital power hype, some companies think: digital power, including digital and a communication link with power. Some other companies, said: Digital power is a kind of a digital pulse-width modulation (PWM) built-chip state machine. There are some manufacturers that: includes a digital power supply to run an algorithm (the algorithm used to compensate for control loop) of the general-purpose digital signal processor (DSP), and only rely on a digital serial bus and can not provide power solutions . There are even other companies that: digital power supply has a state machine or a DSP with digital PWM loop. All of these descriptions can be said to be very puzzled, confused, and some of these methods can not produce good performance. However, in the digital power supply design the right circumstances, it can reduce data center power consumption, shorten product time to market with excellent stability and transient response performance, and improve overall system reliability (such as network equipment in).
Network equipment system designers are faced with upgrading their systems and increase data throughput and performance of functions and features of the pressure. At the same time, how to reduce the system's total power consumption is also necessary to deal with their problems. In the data center, the challenge is that people need to rearrange some of the tasks workflow will be transferred to those who work less than the server (which may be off to other servers) to reduce overall power consumption. To meet these needs, understand the end-user equipment power consumption is very important. Properly designed digital power management system can provide users with power consumption data, so that you can make a flexible energy management decisions.
In today's new electronic system, the state regulator may be the last remaining "blind spots", because generally they do not have the key operating parameters of the direct method of configuration or remote monitoring. For reliable operation, the detection time of the regulator output voltage drift or overheating and accordingly take the appropriate action can be said to be crucial. Well-designed digital power system management (DPSM) program to monitor the performance of the regulator and reported its operation to beyond specification range even in its failure to take corrective action before.
For the DPSM for voltage regulators and power supply design engineers to carefully review the requirements of a learning curve to understand how a computer's graphical user interface (GUI) to complete the programming of such devices and connections. This includes learning new programming software, and each company to provide digital power device has its own unique package. Therefore, we should have a choice after careful thought and a user-friendly software package and the GUI of the company, which is very important. In addition, they should have a reputable technical support staff, the team has such power in the design process to provide the necessary capabilities to help.
Multitrack board power systems
Most embedded systems are powered by a 48V backplane. Usually the voltage step-down to a lower intermediate-bus voltage (typically 12V to 3.3V), circuit boards within the system that support power supply. However, these sub-circuit board or IC need to lower the voltage range of 1V to 3.3V and the dozens to hundreds of A, mA current range operations. Therefore, to the intermediate bus voltage step-down sub-circuit, or IC to the expectations of the required voltage point of load (POL) DC / DC converter is essential. These power rails has a strict ordering, voltage accuracy, margin adjustment and monitoring requirements.
In data communications, telecommunications or storage system, there could be as many as 20 POL voltage rail, system designers need a voltage in accordance with its output, sort, and the maximum allowable current management of these voltage rails simple way. Some processors require the I / O voltage is increased until the voltage at its core, while others require the DSP core voltage of the first of its I / O voltage rises. Power sequencing is also indispensable. Designers need a simple adjustment method to optimize the system performance and storage for each DC / DC converter specific configuration to achieve the purpose of simplifying the design work.
In order to avoid expensive ASIC possibility of being over-voltage conditions, high-speed comparator to monitor the voltage of each supply rail, and beyond the supply rails in a safe operating limits of its range specified to take immediate protective measures. In the digital power supply system, in the event of a fault line through the PMBus alert notification host, and will be off the rails in order for electrical components, such as implemented by ASIC and other protection. Achieve this level of protection needed better accuracy and response time of some tens of μs.
Linear Technology's recently introduced LTC3880/-1 provides a highly accurate digital power system management, and use its high-resolution remote sensing programmability and fast read-back key to achieving real-time control point of load converters, and monitoring functions. The device is a dual output, high efficiency synchronous step-down DC / DC controller with I2C based on the PMBus interface and more than 100 orders and on-board EEPROM. LTC3880/-1 both best in class performance analog switching regulator controller and precision mixed-signal data conversion, can be very easy to implement power system design and management, the device has been based graphical user interface with easy to use (GUI) The LTpowerPlayTM software development system support.
Digital power system management for the control interface
PMBus command language designed to meet the needs of large-scale development of multi-track system is a fully defined command language using the open standard power management protocol that simplifies and power converters, power management devices and the system host processor communication. In addition to a precise definition of the standard commands, consistent with the standard PMBus device also can perform its unique special order, to provide a kind of POLDC / DC converters for programming and monitoring of innovative methods. The agreement with the industry standard SMBus serial interface to perform and achieve power conversion products, programming, control and real-time monitoring. Command language and data format standardization can achieve simple firmware development, thereby speeding up the product to market process. For more information, please visit http://pmbus.org/ website.
LTC3880/-1 programmable control parameters include output voltage margining, current limit, input and output control limits on the power-up sequencing and tracking, switching frequency, identification and traceability data. On-chip EEPROM precision data converters and voltage regulators allow the collection of configuration settings and remote sensing variable values, including the input and output voltage and current, duty cycle, temperature and fault records, and these settings and variables for non-volatile volatile storage. Table 1 lists the following program can be LTC3880/-1 some of the parameters, the high-resolution, remote back to reading skills and alternative solutions.
Analog control loop
LTC3880/-1 is a suitable number of features (for example: output voltage, current limit set point and sorting, etc.) digital programmable DC / DC controller, but it has a loop designed for optimal stability and transient response of the analog feedback control loop, but not the quantitative effects of digital control loop.
Figure 2 shows the feedback control loop analog and digital feedback control loop, the controller IC inside curves of different slopes. Analog loop with a smooth slope, and digital loop is similar to a step function - this will cause stability problems, slowing the speed of transient response and, in some applications, resulting in the need to increase the output capacitor, and digital quantify the effect of the loop will result in increased output ripple.
One of the main advantages of digital power supply is available to predict system failure and the potential to start protective measures, which benefited from the provision of real-time telemetry data. Perhaps the most important point is: with digital management features DC / DC converter enables designers to develop a "green" power system, such a power system to meet the target performance, and be able to rearrange work processes and some Task transferred to those who work less than the server (which may be off to other servers) to determine when to reduce overall power consumption. As the load point, circuit boards, brackets, even the installation of level of energy use very little, thus helping to reduce infrastructure costs and product life cycle total cost of ownership.
Another digital power system management can reduce the design cost advantage and accelerate time to market. By using a intuitive GUI with integrated development environment, you can efficiently develop complex multi-track system. Such systems also through the use of GUI (rather than welding assembly) to adjust and simplify the online test (ICT) and board debugging.
On the definition and benefits of digital power, and now the situation has become confusing. Therefore, the digital power supply is necessary for potential users want to achieve their goals and benefits of digital power system management, the suitability of its products and customers to do investigations. They must determine their own choice of company has a high-performance analog devices, the most popular and easy to use software package, as well as a well-educated, willing to provide the necessary technical support team to help. Fortunately, such companies exist.
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Prosperous LCD Module Manufacturer---Synlink
With its various and up-grading products, Synlink Technology Co Limited is becoming one of the leading powers in the field of LCD module technologies, which encourages a growing number of advanced LCD display module manufactures and popularizes the utility of intelligent LCD module products.
Synlink as an experienced LCD module manufacturer provides its customers with Smart UART LCM and Intelligent MCU products. Furthermore, Synlink perfect its services by offering complete solutions and high added-value technical supports. Meanwhile efforts made in domestic markets, Synlink is also exploring the vast markets overseas and especially in Europe , establishes its widely admirations and highly trusts with high- performance products.
A European subsidiary is prepared to establish in the near future to broad the business. To provide customers a satisfactory service, Synlink experts steadily develop and upgrade the display control technology: the intelligent LCD module products of Synlink are of various sizes. These LCD modules are displayed graphically and characteristically, what makes our product more extraordinary is the touch screen function, efficiently saves time in the market. No matter your enterprise needs to Buy LCD module, getting more information or seeking for cooperation opportunities, please contact us on the website, our on-line Q&A will be at your service.
2011年5月25日星期三
AT056TN04 LCD Driver Controller
As a large screen resolution than analog, glass line will be more dense, the cost of higher technology and backlight, the color less demanding in the field of industrial instrumentation, low-cost analog color LCD screen has become the first choice. FPGA technology presents a color LCD drive controller design using hardware description language to complete the LCD timing and memory interfaces, the successful implementation of the 8 basic colors AT056TN04 display, both to overcome the color monotone monochrome LCD modules, color-rich expensive digital color screen shortcomings, but also has shown a small amount of data the user the advantages of simple operation. Appropriate adjustments can be easily applied to other analog color LCD screen, in the industrial instrumentation has good application value.
To make the products in the market competition in a strong position in the industrial instrumentation, the monochrome LCD color screen gradually being replaced is an inevitable trend. Since high resolution digital color screen, the glass will be more dense line, process and screen backlight will be higher cost than analog. Therefore, less demanding on the color of the field of industrial instrumentation, has become the preferred low-cost analog screen. The design of instrumentation for industrial applications in the background with a good group of record companies TFT analog LCD screen AT056TN04, using FPGA technology to achieve the drive controller design.
1 shows the memory arrangement
LCD timing controller driver is in control of the system clock, line clock and frame synchronization clock synchronization under the control loop to put data in the display memory to the LCD screen, while under the control of the microprocessor memory data updates. To simplify the design, each color pixel LCD screen, 1 b are used to quantify 8 basic colors can be achieved, the circuit simple. To facilitate the structural arrangement, the LCD screen coordinates of upper left corner of the first point (0,0), lower right corner coordinates (233,319). 64 KB of SRAM used as a display memory, each memory cell, said the LCD screen 8 adjacent pixels of a color component, in which the red end of the address stored in the unit 00, the green is 01, blue 10. Although the waste end of the address is 11 units, addressing is very convenient. 16-bit address lines as the high 8-bit row address, the middle 6 bits for the column address, low address two of the colors.
2 Design of LCD driver timing
AT056TN04 drive signals of the most important interface signals are: the frame start pulse STV, scan driver shift clock CKV, scan driver output enable control OEV, a common electrode driving signal Vcom, data-driven output enable control of OEH, line scanning start pulse STH, data sampling and the shift clock CPH. AT056TN04 display process is as follows: first, the frame start signal STV starts a data display, over time OEV tOEV from low to high maintenance and then high to low, while VCOM transitions, OEH and then descending to maintain tOEH transition from low to high, after tDIS1 STH after the transition from low to high, and then maintain tSTH transition from high to low to start the first line of the display. During this period CKV maintain tCKV from low to high after the high to low. Line after completion, and then replaced one line display, so to repeat down. After a frame data, and then the cycle of this process, the details of the timing shown in Figure 1.
Figure in all time intervals are integer multiple of CPH, CPH therefore count with the counter tcph on to determine the value of tcph other control signals can be generated, while ensuring that each group signal synchronization. Time requirements of the interface signals in AT056TN04 has been given in the manual, CPH is the smallest unit of the timing, the cycle is 154 ns, the error can not exceed 4 ns. Active with 13 MHz crystal clock cycle 76.9 ns, its divided by 2 to get the CPH 153.8 ns clock. AT056TN04 each frame contains 256 ~ 268 lines of data, the real number is 234-line display line, the last of the small number of lines of data is not displayed. External controller can not display the data in these rows in the display memory read and write operations. The design of the data shows the number of lines per frame is set to 260 lines, then STV is that every line will produce a pulse of 260, with a line counter th, when tcpvh 260 (the line shows end) plus 1, after th, to generate STV, STV appears to delay tSV (3 lines)
3 LCD screen refresh module design
AT056TN04 configured to scan from left to right from top to bottom, each time point into the memory 8 tri-color information (3 B), CPH clock every three bytes of RGB data simultaneously to the left one, in The RGB output pin connected PFGA 4.7 kΩ pull-up resistor to 5 V power supply, resulting in VR, VG, VB signal drive the LCD screen. In the RAM read and write control module under the action and timing module in the controller will display RAM to the cycle of image data displayed on the LCD screen. Th and tcpvh to use the counter generated address easy to achieve on the RAM read and write operations. Th value as the row address them with, tcph [9:4] as the column address, tcph [1: O] as the color of the address.
4 Conclusion
Memory at a reasonable arrangement and design of the ranks of the counter based on timing control cleverly done and the liquid crystal display memory read and write data to achieve 8 of AT056TN04 basic colors of the display control. As a result of FPGA design, a slightly modified form can be applied to other soft-core LCD tft module, Color overcome the monotonous monochrome LCD module, and the color rich digital color screen expensive shortcomings. Of color in less demanding industrial instrumentation has a certain value.
To make the products in the market competition in a strong position in the industrial instrumentation, the monochrome LCD color screen gradually being replaced is an inevitable trend. Since high resolution digital color screen, the glass will be more dense line, process and screen backlight will be higher cost than analog. Therefore, less demanding on the color of the field of industrial instrumentation, has become the preferred low-cost analog screen. The design of instrumentation for industrial applications in the background with a good group of record companies TFT analog LCD screen AT056TN04, using FPGA technology to achieve the drive controller design.
1 shows the memory arrangement
LCD timing controller driver is in control of the system clock, line clock and frame synchronization clock synchronization under the control loop to put data in the display memory to the LCD screen, while under the control of the microprocessor memory data updates. To simplify the design, each color pixel LCD screen, 1 b are used to quantify 8 basic colors can be achieved, the circuit simple. To facilitate the structural arrangement, the LCD screen coordinates of upper left corner of the first point (0,0), lower right corner coordinates (233,319). 64 KB of SRAM used as a display memory, each memory cell, said the LCD screen 8 adjacent pixels of a color component, in which the red end of the address stored in the unit 00, the green is 01, blue 10. Although the waste end of the address is 11 units, addressing is very convenient. 16-bit address lines as the high 8-bit row address, the middle 6 bits for the column address, low address two of the colors.
2 Design of LCD driver timing
AT056TN04 drive signals of the most important interface signals are: the frame start pulse STV, scan driver shift clock CKV, scan driver output enable control OEV, a common electrode driving signal Vcom, data-driven output enable control of OEH, line scanning start pulse STH, data sampling and the shift clock CPH. AT056TN04 display process is as follows: first, the frame start signal STV starts a data display, over time OEV tOEV from low to high maintenance and then high to low, while VCOM transitions, OEH and then descending to maintain tOEH transition from low to high, after tDIS1 STH after the transition from low to high, and then maintain tSTH transition from high to low to start the first line of the display. During this period CKV maintain tCKV from low to high after the high to low. Line after completion, and then replaced one line display, so to repeat down. After a frame data, and then the cycle of this process, the details of the timing shown in Figure 1.
Figure in all time intervals are integer multiple of CPH, CPH therefore count with the counter tcph on to determine the value of tcph other control signals can be generated, while ensuring that each group signal synchronization. Time requirements of the interface signals in AT056TN04 has been given in the manual, CPH is the smallest unit of the timing, the cycle is 154 ns, the error can not exceed 4 ns. Active with 13 MHz crystal clock cycle 76.9 ns, its divided by 2 to get the CPH 153.8 ns clock. AT056TN04 each frame contains 256 ~ 268 lines of data, the real number is 234-line display line, the last of the small number of lines of data is not displayed. External controller can not display the data in these rows in the display memory read and write operations. The design of the data shows the number of lines per frame is set to 260 lines, then STV is that every line will produce a pulse of 260, with a line counter th, when tcpvh 260 (the line shows end) plus 1, after th, to generate STV, STV appears to delay tSV (3 lines)
3 LCD screen refresh module design
AT056TN04 configured to scan from left to right from top to bottom, each time point into the memory 8 tri-color information (3 B), CPH clock every three bytes of RGB data simultaneously to the left one, in The RGB output pin connected PFGA 4.7 kΩ pull-up resistor to 5 V power supply, resulting in VR, VG, VB signal drive the LCD screen. In the RAM read and write control module under the action and timing module in the controller will display RAM to the cycle of image data displayed on the LCD screen. Th and tcpvh to use the counter generated address easy to achieve on the RAM read and write operations. Th value as the row address them with, tcph [9:4] as the column address, tcph [1: O] as the color of the address.
4 Conclusion
Memory at a reasonable arrangement and design of the ranks of the counter based on timing control cleverly done and the liquid crystal display memory read and write data to achieve 8 of AT056TN04 basic colors of the display control. As a result of FPGA design, a slightly modified form can be applied to other soft-core LCD tft module, Color overcome the monotonous monochrome LCD module, and the color rich digital color screen expensive shortcomings. Of color in less demanding industrial instrumentation has a certain value.
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