LCD driver IC is a semiconductor device products, collectively, including: integrated circuits (integratedcircuit, abbreviations: IC), two transistors,
, Special electronic components, and then some talk also covers all general electronic components like resistors, capacitors, circuit board / PCB board, and many other related products.
IC can be classified according to function: digital IC, analog IC, and other microwave IC, in which the digital IC is the most widely used in recent years, the fastest-growing IC varieties. IC is a digital transmission, processing, digital signal processing IC, digital IC can be divided into general and special digital IC.
Universal IC: are those the user more extensive field of use, standards-based circuits, such as memory (DRAM), microprocessor (MPU) and microcontroller (MCU), reveals the status and level of digital IC.
Specific IC (ASIC): refers to a specific user, a special purpose or special circuit design.
Currently, there are several IC products design, production and sales model.
1. IC manufacturers (IDM) to design, by its own production line processing, packaging, testing the finished product after the sale of the chip itself.
2. IC design company (Fabless) processing technology with the standard line (Foundry) combination. Chip design company will have the final physical layout design to the Foundry manufacturing the same, also commissioned a professional manufacturer packaging and testing completed, the finished product as an IC chip design company's products on their own sales. Analogy, Fabless equivalent to authors and publishers, and Foundry is equivalent to printing, played industries "leading"role should be the former.
2010年12月26日星期日
PIC microcontroller software skills asynchronous serial interface
In developing embedded applications using SCM system, the asynchronous serial communication is usually used as a communication mode, many applications also require multi-way asynchronous serial communication. We usually familiar with the various manufacturers of microcontrollers, most of the chip provides a hardware UART display module only, use it all the way serial communication can be easily achieved. PIC MCU is no exception, in their rich family members, in addition to high-end series (PIC17/18) some models with a two-chip hardware UART modules, most of the other models only way chip UART, some low-end cheap The PIC microcontroller is not even with hardware UART. In order to improve system performance and low cost to increase by software engineers to design all the way or way to achieve asynchronous serial communication. Many engineers use the UART software reliability and efficiency in the skeptical, in fact, the software key issue is to look at the manner in which to achieve reliable UART function.
In the discussion of specific implementations, we first take a brief look at the definition of asynchronous serial communication format. Send a full byte of information, there must be "start bit", "number of data bits," "parity bit" and "stop bit"; must define the time width of each message - to send the information bits per second the number is "baud rate." SCM system commonly used baud rates from 300 ~ 19 200 b / s. When the baud rate of 1200b / s, each information bit of the time width of 1 / 1200 ≈ 833μs; no data communication, data line idle state should be high, "start bit" is low, data followed by a low starting position and the parity bit (if any), "stop bit" for the high
As the name suggests is a three-speed sampling frequency to three times the baud rate sampling of the receiver Rx pin to ensure the detection of the "start bit", but also can adjust the sampling time interval; will effectively control the data bits in the symbol sampling points the middle 1 / 3 to minimize errors, improve receiver accuracy. Figure 1 we start bit and enlarge the part of the data shown in Figure 2, to be divided into three equal parts of each information bit, set the width of each equal parts of time ts, to facilitate analysis.
The third harmonic sampling bits of information, each information bit will be sampled to three. When in idle state and detects the start bit, the earliest detected time of the start bit low S0 shadow will fall, although each specific sampling points in the shadow of this S0 random changes. After the start bit is detected low, the time interval of 4 × ts, exactly in the middle of the first data bit 1 / 3 (shaded areas in Figure 2 Ds). After the data bits, parity bit and stop bit sampling interval is 3 × ts, all the sampling sites, fall symbol of the middle 1 / 3, the sampling data are most reliable.
PIC microcontrollers implement software UART using this method, the hardware as long as the arbitrary definition of two I / O pins, respectively, initialized to the input (serial data receiving) and output (serial data to send) to; software as long as the realization of time sampling time interval over there in the mid-range microcontroller interrupt mechanism can use different timers (TMR0, TMR1, TMR2, etc.) achieved through the timer interrupt, in the low-end PIC microcontroller without interruption of the main loop to control the consumption per time to achieve. For the 1200 b / s baud rate, symbol width of 833μs, the sampling interval is the 278μs. Receive or send the serial is a process control problem, with the state machine to achieve the most efficient way to easy. Figure 3 shows the reference receiver state machine serial transfer.
Journal of the network to add Edition, we introduce a simple C-language reference source. This paragraph Program for 1200b / s full-duplex serial communication, a start bit, 8 data bits, no parity, 1 stop bit, no frame errors discrimination. Compiler environment HITECH-PICC compiler V8.00PL4 or later.
Additional version of the program in the network, the key part of TMR0 interrupt service. TMR0 interrupt every 278μs time around, TMR0 interrupt response is the software UART receive and transmit full-duplex communication process implementation. By Hitech-PICC efficient code compiled, about 150 word instruction code, the interrupt service an average of about 35 instruction cycles, that is, the way the software UART to achieve operating frequencies in the 4 MHz MCU takes to run about 12% of the bandwidth. Theoretically, as long as the operation of MCU with sufficient bandwidth to other tasks, in this interrupt service routine within the code and then receive and send a copy or copies (data structure independent), can achieve multi-channel software UART. Of course, if different baud rate per channel, the sampling frequency must be three times the highest baud rate. Interval between sampling points of different independent baud rate adjustment.
The greatest advantage of this method is extremely flexible hardware and software configurations: pins can be sent to receive any definition; sampling time can be achieved with different timers; using the same sampling time can easily achieve multiple software UART and so on. Drawback is: no matter whether the data communication, and always take MCU operating bandwidth; serial communication baud rate is not too high, 4 MHz PIC microcontroller generally work to achieve 2400bps full duplex communication. Of course, you can increase the oscillation frequency of the MCU for high baud rate communication, when operating in 20 MHz PIC microcontroller, the realization of 9600b / s more than enough.
In the discussion of specific implementations, we first take a brief look at the definition of asynchronous serial communication format. Send a full byte of information, there must be "start bit", "number of data bits," "parity bit" and "stop bit"; must define the time width of each message - to send the information bits per second the number is "baud rate." SCM system commonly used baud rates from 300 ~ 19 200 b / s. When the baud rate of 1200b / s, each information bit of the time width of 1 / 1200 ≈ 833μs; no data communication, data line idle state should be high, "start bit" is low, data followed by a low starting position and the parity bit (if any), "stop bit" for the high
As the name suggests is a three-speed sampling frequency to three times the baud rate sampling of the receiver Rx pin to ensure the detection of the "start bit", but also can adjust the sampling time interval; will effectively control the data bits in the symbol sampling points the middle 1 / 3 to minimize errors, improve receiver accuracy. Figure 1 we start bit and enlarge the part of the data shown in Figure 2, to be divided into three equal parts of each information bit, set the width of each equal parts of time ts, to facilitate analysis.
The third harmonic sampling bits of information, each information bit will be sampled to three. When in idle state and detects the start bit, the earliest detected time of the start bit low S0 shadow will fall, although each specific sampling points in the shadow of this S0 random changes. After the start bit is detected low, the time interval of 4 × ts, exactly in the middle of the first data bit 1 / 3 (shaded areas in Figure 2 Ds). After the data bits, parity bit and stop bit sampling interval is 3 × ts, all the sampling sites, fall symbol of the middle 1 / 3, the sampling data are most reliable.
PIC microcontrollers implement software UART using this method, the hardware as long as the arbitrary definition of two I / O pins, respectively, initialized to the input (serial data receiving) and output (serial data to send) to; software as long as the realization of time sampling time interval over there in the mid-range microcontroller interrupt mechanism can use different timers (TMR0, TMR1, TMR2, etc.) achieved through the timer interrupt, in the low-end PIC microcontroller without interruption of the main loop to control the consumption per time to achieve. For the 1200 b / s baud rate, symbol width of 833μs, the sampling interval is the 278μs. Receive or send the serial is a process control problem, with the state machine to achieve the most efficient way to easy. Figure 3 shows the reference receiver state machine serial transfer.
Journal of the network to add Edition, we introduce a simple C-language reference source. This paragraph Program for 1200b / s full-duplex serial communication, a start bit, 8 data bits, no parity, 1 stop bit, no frame errors discrimination. Compiler environment HITECH-PICC compiler V8.00PL4 or later.
Additional version of the program in the network, the key part of TMR0 interrupt service. TMR0 interrupt every 278μs time around, TMR0 interrupt response is the software UART receive and transmit full-duplex communication process implementation. By Hitech-PICC efficient code compiled, about 150 word instruction code, the interrupt service an average of about 35 instruction cycles, that is, the way the software UART to achieve operating frequencies in the 4 MHz MCU takes to run about 12% of the bandwidth. Theoretically, as long as the operation of MCU with sufficient bandwidth to other tasks, in this interrupt service routine within the code and then receive and send a copy or copies (data structure independent), can achieve multi-channel software UART. Of course, if different baud rate per channel, the sampling frequency must be three times the highest baud rate. Interval between sampling points of different independent baud rate adjustment.
The greatest advantage of this method is extremely flexible hardware and software configurations: pins can be sent to receive any definition; sampling time can be achieved with different timers; using the same sampling time can easily achieve multiple software UART and so on. Drawback is: no matter whether the data communication, and always take MCU operating bandwidth; serial communication baud rate is not too high, 4 MHz PIC microcontroller generally work to achieve 2400bps full duplex communication. Of course, you can increase the oscillation frequency of the MCU for high baud rate communication, when operating in 20 MHz PIC microcontroller, the realization of 9600b / s more than enough.
Changhong: seize the commanding heights of flat panel display
At present, the emerging industry is clearly a strategic focus on supporting the target country's future, including a new generation of information technology is a top priority. Changhong, China's electronic information industry as a leader in enterprises, in flat panel displays, home appliances, embedded software, digital home and other fields has yielded fruitful results, especially in the field of flat panel display, after the tireless efforts of recent years, Changhong has been playing a simultaneous development of the only plasma, LCD and OLED business, forming a flat-panel TV "panel + machine" in the whole industrial chain. As remarkable results, Changhong, "three-dimensional layout of the" strategic thinking for many people in the industry talked about.
Management Case Research Center of Peking University Visiting Fellow, Changhong Xu tomorrow once described: "Changhong to build three-dimensional aspect of a third strategic development of large flat panel system, the potential is enough."
Break the shackles of plasma technology
From 2007 to the present, Changhong PDP project is a "wait was worth it." Just 3 years, this "highly controversial" project not only withstood the earthquakes, landslides and other natural weather "torture", but also withstood the upstream technology, human resources, capital and other confusion. Earlier this year, Changhong plasma panel production line finally mass production. At this point, Changhong became the first line of display products and most complete industrial chain business, they become a major LCD, plasma research and development base.
The industry believes that the international intellectual property rights Changhong has the latest generation of new plasma display production lines, to achieve a "screen + machine" flat panel TV industry vertical integration, greatly enhance the color TV industry's national competitiveness. Changhong with state-level enterprise technical centers, through the integration of national engineering research centers and engineering labs, the establishment of a new flat panel display R & D platform for globalization, expand cross-regional, cross-industry collaborative R & D, form a complete basis for technologies, products, technology, technology such as multi-level R & D system, in materials, devices, processes, inspection and other fields has made significant innovations.
Changhong plasma panel project using the most advanced flat-panel display technology, mainly produced 42-inch, 50 inch and larger plasma screens, the formation of annual output of 600 million to 8 million plasma screen module capacity, market share is expected to reach 17 %, into the top three global industry. Changhong plasma screen project to bring huge industrial cluster effect, a full range of localization achieved breakthroughs in materials, devices, equipment, research and development and other fields, and domestic enterprises, research institutes, strategic cooperation in full swing, with dozens of companies, signed a joint development agreement and scientific research units.
In plasma technology, control a large number of core technologies of Changhong and about 600 patents, the vast majority of patents for inventions involving a new plasma display panel structure, process, raw materials, circuit design, software and hardware, many of which are based on the core patents. Changhong has already begun to lead a number of national standards, plasma, project work. Compared with other similar flat products, the use of self-luminous plasma, with the natural brightness uniformity, color gamut coverage of large, short response time, viewing angle, dynamic energy consumption is low, cost advantages of large screen. Changhong plasma overall performance in similar products in the world-class; in plasma chain-building, Changhong in materials, devices, equipment and research and development aspects of the progressive realization of localization, establish and improve the local plasma industry support system, and achieve sustainable cost advantage and technological advantages.
It is understood that the efforts of the rainbow, plasma technology has already made considerable progress. In the December 1 implementation of energy efficiency standards in the flat panel TV, Changhong's new plasma TV all in compliance with requirements.
Highlights the cost advantages of LCM integration
In an interview, general manager of Sichuan Changhong Electric Co., Ltd. physical Bin Liu told reporters: "Changhong will spare no effort to expand the LCD TV market." According to him, especially the field of large-screen 50-inch plasma TV should be above the world, while the small LCD TV size is more advantage. For Changhong, the foot plasma screen is the firm's strategic choice, and LCD TVs is to cater to the needs of the current market more practical choice.
In the LCD field, Changhong chose cooperation. October 2009, a joint venture between Changhong and AU Optronics formally unveiled a long intellectual, the first specifically for Changhong's LCD screen in full production. Friends of the rainbow and the strategic partnership of common wisdom long optical components, the main LCD monitors, LCD TV and optoelectronic components and related peripheral products, production, processing, assembly and repair operations. This marks the formal involvement of Changhong LCD drive module areas.
The reporters found that seems to play Changhong LCD display module involved in the "exemplary" role. It is understood that optical is the length of AUO Chi in China's first joint venture, acquisition and mainland China's leading Taiwan's flat panel TV manufacturers a powerful complementary. Long after the establishment of intellectual Optoelectronics, AUO has gradually and Haier, TCL and other TV companies adopt the model of joint cooperation. At the same time, the promotion of national policies and Changhong driven, TCL, Hisense and other TV manufacturers have started from the layout of the LCD module upstream, Huaxing power, BOE-generation LCD panel production line also began to layout.
In addition, Changhong active "machine + module" integrated design and manufacturing. At present, Changhong plasma and LCD TVs in the two areas of flat products have achieved integrated design, manufacturing, effectively reducing the manufacturing costs and greatly enhance the product competitiveness. Changhong thorough grasp of the plasma panel resources, innovation and achieve the level of raw materials, and the Korean and Japanese companies simultaneously; the same time to enter the field of LCD modules, chip-level innovation to achieve the raw materials level of innovation is still some distance, the distance is the distance and the Korean and Japanese companies . Through the screen, integrated modules and machine design, manufacturing, industry collaboration can play an effective product standardization to achieve internal and external to achieve product differentiation. On the one hand, the formation of more accurate and efficient "production - for - sale," the implementation of mechanisms to maintain the status screen state and relatively stable product, according to consumer demand in favor of new products to market quickly; the other hand, can reduce intermediate links materials, production, packaging, logistics, quality and service costs. "Electronic information industry restructuring and revitalization plan" also made it clear that to "strive in the new display panel production, the whole module integrated design, manufacturing, and other areas of the glass substrate to achieve breakthroughs in key technologies."
Third Research Institute of China Electronics Technology Group Senior Engineer Liu Quanen told reporters: "integrated design and manufacturing is an effective way to reduce product cost."
OLED research and development effort to devise strategies
Changhong insiders by saying, Changhong investment plasma panel known as the "convent", that is, take a path out of nothing, at first is very risky, but the project into the stable period after the benefit is greater; Changhong work to do with the AUO LCD Module called "route through" integration of their superior resources, expand the LCD TV integrated design, manufacturing, reduce overall costs industry; and invest in OLED display first production line is called the "Methodist", promising a forward-looking technology, there awareness of investment opportunities once the industry matures, we can quickly scale.
Sichuan Changhong Electric Co., Ltd. proudly Dan Yang, deputy chief engineer, told reporters: "At this stage, Changhong has been done in the PDP material level, and achieve in the LCD module level, in the OLED and achieve a pre-research level."
It is noteworthy that, Changhong had chosen horse plasma production lines, there are also strategic considerations OLED. It is understood, OLED development depends on the organic material in the development and improvement, and development, plasma the most important core area is materials, materials research and development, OLED and plasma is the same, so Changhong investment plasma is in fact solve the flat-panel TV Development material issues. If Changhong continued to cook on the plasma 5 to 6 years, then the plasma during the R & D and talent pool for future development of OLED is very helpful, and its OLED conducive to better address the challenges facing the material. In the next 6 to 7 years, OLED will become the market hit. Opportunities through the development of plasma pave the way for the development of OLED, which is the strategic layout of the rainbow, and do it two steps in the future will be able to Changhong in the OLED field with foreign enterprises stood side by side.
For the development of OLED industry, Changhong's rainbow, as the company is divided into two steps, first step is the small size of the industry, the second step is to focus on the development of large size. Currently, dozens of Rainbow, as the combined upstream and downstream enterprises OLED industry, the establishment of the OLED Engineering Laboratory, to create clusters of industrial chain advantage. Rainbow Project as a project PMOLED OLED mass production line was April 1, 2010 was put into trial production, the design capacity of 12 million years (calculated to 1 inch). December 2009 started construction of AMOLED pilot line, and already has a complete laboratory and AMOLED panel PMOLED laboratory, ownership of the industry's leading low-temperature polycrystalline silicon metal induced some of the key technologies, has successfully developed a 2.6 to 7.6 inches AMOLED samples .
Management Case Research Center of Peking University Visiting Fellow, Changhong Xu tomorrow once described: "Changhong to build three-dimensional aspect of a third strategic development of large flat panel system, the potential is enough."
Break the shackles of plasma technology
From 2007 to the present, Changhong PDP project is a "wait was worth it." Just 3 years, this "highly controversial" project not only withstood the earthquakes, landslides and other natural weather "torture", but also withstood the upstream technology, human resources, capital and other confusion. Earlier this year, Changhong plasma panel production line finally mass production. At this point, Changhong became the first line of display products and most complete industrial chain business, they become a major LCD, plasma research and development base.
The industry believes that the international intellectual property rights Changhong has the latest generation of new plasma display production lines, to achieve a "screen + machine" flat panel TV industry vertical integration, greatly enhance the color TV industry's national competitiveness. Changhong with state-level enterprise technical centers, through the integration of national engineering research centers and engineering labs, the establishment of a new flat panel display R & D platform for globalization, expand cross-regional, cross-industry collaborative R & D, form a complete basis for technologies, products, technology, technology such as multi-level R & D system, in materials, devices, processes, inspection and other fields has made significant innovations.
Changhong plasma panel project using the most advanced flat-panel display technology, mainly produced 42-inch, 50 inch and larger plasma screens, the formation of annual output of 600 million to 8 million plasma screen module capacity, market share is expected to reach 17 %, into the top three global industry. Changhong plasma screen project to bring huge industrial cluster effect, a full range of localization achieved breakthroughs in materials, devices, equipment, research and development and other fields, and domestic enterprises, research institutes, strategic cooperation in full swing, with dozens of companies, signed a joint development agreement and scientific research units.
In plasma technology, control a large number of core technologies of Changhong and about 600 patents, the vast majority of patents for inventions involving a new plasma display panel structure, process, raw materials, circuit design, software and hardware, many of which are based on the core patents. Changhong has already begun to lead a number of national standards, plasma, project work. Compared with other similar flat products, the use of self-luminous plasma, with the natural brightness uniformity, color gamut coverage of large, short response time, viewing angle, dynamic energy consumption is low, cost advantages of large screen. Changhong plasma overall performance in similar products in the world-class; in plasma chain-building, Changhong in materials, devices, equipment and research and development aspects of the progressive realization of localization, establish and improve the local plasma industry support system, and achieve sustainable cost advantage and technological advantages.
It is understood that the efforts of the rainbow, plasma technology has already made considerable progress. In the December 1 implementation of energy efficiency standards in the flat panel TV, Changhong's new plasma TV all in compliance with requirements.
Highlights the cost advantages of LCM integration
In an interview, general manager of Sichuan Changhong Electric Co., Ltd. physical Bin Liu told reporters: "Changhong will spare no effort to expand the LCD TV market." According to him, especially the field of large-screen 50-inch plasma TV should be above the world, while the small LCD TV size is more advantage. For Changhong, the foot plasma screen is the firm's strategic choice, and LCD TVs is to cater to the needs of the current market more practical choice.
In the LCD field, Changhong chose cooperation. October 2009, a joint venture between Changhong and AU Optronics formally unveiled a long intellectual, the first specifically for Changhong's LCD screen in full production. Friends of the rainbow and the strategic partnership of common wisdom long optical components, the main LCD monitors, LCD TV and optoelectronic components and related peripheral products, production, processing, assembly and repair operations. This marks the formal involvement of Changhong LCD drive module areas.
The reporters found that seems to play Changhong LCD display module involved in the "exemplary" role. It is understood that optical is the length of AUO Chi in China's first joint venture, acquisition and mainland China's leading Taiwan's flat panel TV manufacturers a powerful complementary. Long after the establishment of intellectual Optoelectronics, AUO has gradually and Haier, TCL and other TV companies adopt the model of joint cooperation. At the same time, the promotion of national policies and Changhong driven, TCL, Hisense and other TV manufacturers have started from the layout of the LCD module upstream, Huaxing power, BOE-generation LCD panel production line also began to layout.
In addition, Changhong active "machine + module" integrated design and manufacturing. At present, Changhong plasma and LCD TVs in the two areas of flat products have achieved integrated design, manufacturing, effectively reducing the manufacturing costs and greatly enhance the product competitiveness. Changhong thorough grasp of the plasma panel resources, innovation and achieve the level of raw materials, and the Korean and Japanese companies simultaneously; the same time to enter the field of LCD modules, chip-level innovation to achieve the raw materials level of innovation is still some distance, the distance is the distance and the Korean and Japanese companies . Through the screen, integrated modules and machine design, manufacturing, industry collaboration can play an effective product standardization to achieve internal and external to achieve product differentiation. On the one hand, the formation of more accurate and efficient "production - for - sale," the implementation of mechanisms to maintain the status screen state and relatively stable product, according to consumer demand in favor of new products to market quickly; the other hand, can reduce intermediate links materials, production, packaging, logistics, quality and service costs. "Electronic information industry restructuring and revitalization plan" also made it clear that to "strive in the new display panel production, the whole module integrated design, manufacturing, and other areas of the glass substrate to achieve breakthroughs in key technologies."
Third Research Institute of China Electronics Technology Group Senior Engineer Liu Quanen told reporters: "integrated design and manufacturing is an effective way to reduce product cost."
OLED research and development effort to devise strategies
Changhong insiders by saying, Changhong investment plasma panel known as the "convent", that is, take a path out of nothing, at first is very risky, but the project into the stable period after the benefit is greater; Changhong work to do with the AUO LCD Module called "route through" integration of their superior resources, expand the LCD TV integrated design, manufacturing, reduce overall costs industry; and invest in OLED display first production line is called the "Methodist", promising a forward-looking technology, there awareness of investment opportunities once the industry matures, we can quickly scale.
Sichuan Changhong Electric Co., Ltd. proudly Dan Yang, deputy chief engineer, told reporters: "At this stage, Changhong has been done in the PDP material level, and achieve in the LCD module level, in the OLED and achieve a pre-research level."
It is noteworthy that, Changhong had chosen horse plasma production lines, there are also strategic considerations OLED. It is understood, OLED development depends on the organic material in the development and improvement, and development, plasma the most important core area is materials, materials research and development, OLED and plasma is the same, so Changhong investment plasma is in fact solve the flat-panel TV Development material issues. If Changhong continued to cook on the plasma 5 to 6 years, then the plasma during the R & D and talent pool for future development of OLED is very helpful, and its OLED conducive to better address the challenges facing the material. In the next 6 to 7 years, OLED will become the market hit. Opportunities through the development of plasma pave the way for the development of OLED, which is the strategic layout of the rainbow, and do it two steps in the future will be able to Changhong in the OLED field with foreign enterprises stood side by side.
For the development of OLED industry, Changhong's rainbow, as the company is divided into two steps, first step is the small size of the industry, the second step is to focus on the development of large size. Currently, dozens of Rainbow, as the combined upstream and downstream enterprises OLED industry, the establishment of the OLED Engineering Laboratory, to create clusters of industrial chain advantage. Rainbow Project as a project PMOLED OLED mass production line was April 1, 2010 was put into trial production, the design capacity of 12 million years (calculated to 1 inch). December 2009 started construction of AMOLED pilot line, and already has a complete laboratory and AMOLED panel PMOLED laboratory, ownership of the industry's leading low-temperature polycrystalline silicon metal induced some of the key technologies, has successfully developed a 2.6 to 7.6 inches AMOLED samples .
2010年12月21日星期二
TFT LCD with experience
First of all, we understand the structure of a number of TFT LCD, as shown below, mainly by the polarizer, consider color base plate, LCD, TFT substrates, chip-chip oscillator, backlight components. Consider color in the base plate and the TFT substrate enclosed in twisted nematic liquid crystal (TN), constitute the liquid crystal cell, taking into account color devices are fabricated on a transparent substrate a common electrode, TFT substrate produced a matrix of thin-mode transistor, for the opening pixel electrode voltage signal, in order to maintain a certain thickness of the liquid crystal layer, placed between two pieces of glass with transparent septum (polyester film or glass ball mode).
TFT LCD signal components: the main circuit from the backlight and display circuit.
Backlight circuit: 3.5-inch TFT LCD backlight, mostly using white LED as backlight source, usually by 6 white LED serial composition (as shown), probably drive voltage of about 20V, 20mA current around a lot of parts consumption . For battery-powered systems, most of the boost DC / DC to drive, many manufacturers have introduced specifically for white LED drive thread.
Display circuit: the display circuit generally Timing Controller, Source LCD Driver, Gate Driver composition. Some IC Timing Controller and Source Driver to integrate together, and some IC are integrated into three parts. This three-part integrated circuits are generally inside the TFT LCM, and some TFT LCD Timing Controller IC to put out a (such as SHARP some of the LCD).
SAMSUNG LTV350QV LCD Block Diagram Analysis (as shown): LTV350QV the DRIVER IC is S6F2002,
S6F2002 Integrated Timing Controller, Source Driver, Gate Driver section and power management components, 164RGB X 240 driving ability, so for 320 X 240 QVGA resolution, you need two S6F2002. Two S6F2002, one as the main controller, one as a slave controller, it is precisely because there are two LVT350QV DRIVER IC driver's sake, if the timing with the bad power, it is prone to show abnormal (half of the display is not normal, half of the show normal).
A block diagram of the Taiwan TFT LCD (below): it is driven IC has two pieces, one integrates the Timing Controller and Source Driver, another one is the Gate Driver.
TFT LCD common signal interpretation:
LED_Cathode / LED_Anode: LCD backlight power supply
M / POL: LCD driver polarity model, used to generate VCOM signal
RESET: Global reset signal
CS / SCL / SDI: LCD TCON IC configuration port
DATA [0:23]: LCD RGB24BIT data signal, generally we use 16BIT, as observed by the human eye color and 24BIT 16BIT color is not much different, but 16BIT 24BIT required data to be processed is much smaller than the general the status of the remaining cases we have data cable to connect to high.
HSYNC: Horizontal sync clock signal
VSYNC: Vertical sync clock signal
DOTCLK: pixel clock signal
VDD: digital power supply, usually 3.3V
AVDD: Analog power supply, usually 5V
VGL: GATE OFF control voltage
VGH: GATE ON control voltage
VCOM: LCD common drive electrode
ENABLE: data enable signal
TFT circuit driving principle: sent by the CPU through the LCD interface, the video signal and the timing clock after TCON converter, RGB data through the D / A converter to the SOURCE side, while the shift clock signal driving TCON GATE side strobe line open the line all the transistors, SOURCE capacitor to the LCD, grayscale LCD produce and maintain, through the GATE shift, continue to write the following line of the LCD image, when the whole line of finish, starting from the first line again.
If you always show a static image, the LCD voltage on the electrode would have been the same, when the revocation of voltage, the LCD is difficult to be reinstated, and likely to cause liquid damage. To solve this problem is to change the polarity of the LCD control voltage, that even the static images, the voltage on the liquid crystal electrodes have also been overturned. LCD are used generally in the form of flip line, by changing the voltage polarity of VCOM the public to achieve the purpose of flipping. TCON IC will normally send a signal M or POL, and we use this signal generator VCOM, the general conversion circuit using a non-party circuit have or shipped. VCOM by adjusting the DC side, we can change the color LCD, adjust AC side, you can change the LCD contrast. Perhaps the reason is because the line flip, and some level of LCD will produce stripes (Flicker phenomenon), LTV350QV not very clear, generally more obvious in Taiwan LCD.
Point-screen experience:
Common point screen steps:
1, ensure that the data, clock, power and other connections to normal.
2, to ensure that the work of several groups of LCD power supply VDD / AVDD / VGL / VGH normal.
3, LCD Configuration: Some LCD's TCON IC need to use the SPI interface configuration.
a) configuration is mainly the polarity of the clock signal, scanning direction, and some support CCIR601/656/OSD TCON IC function, according to the actual situation of the main configuration.
b) GAMMA correction: the general parameters provided by the manufacturer under the LCD correction, before the transfer is because the manufacturers give LTV350QV GAMMA parameter is incorrect, resulting in the color display is not normal.
c) SPI time series: general different LCD screen SPI timing and registers, there will be some differences, I usually operate under the register timing diagram (below), by writing to registers, as long as the LCD has responded, that there is little SPI communication problem.
4, the clock setting:
a) general LCD SPEC will be given in the parameters on the timing and sequence diagram, we follow the figure set on it. The following figure: we can know that the clock frequency, pulse width, the first sweep, retrace and so on.
As shown by the picture we can know the HSYNC and VSYNC clock polarity is negative.
Through the following figure we can know is latched data, falling edge of the data
Through the above steps should appear above the LCD screen is beautiful, the image position may also have some bias, but that's okay, look at the screen before scanning the image adjustment, left and right back to sweep up or down to OK.
Image exception handling:
Image color is not normal: it is possible clock polarity model, there may VCOM adjustment is not normal.
Water ripples appear: Make sure the power VDD / AVDD / VGL / VGH ripple is small enough to ensure that the correct waveform VCOM, VCOM circuit side of the power supply stability.
Black and white on the CLP: General TFT LCD on power requirements are more stringent, the timing required in accordance with the Power LCD SPEC
TFT LCD signal components: the main circuit from the backlight and display circuit.
Backlight circuit: 3.5-inch TFT LCD backlight, mostly using white LED as backlight source, usually by 6 white LED serial composition (as shown), probably drive voltage of about 20V, 20mA current around a lot of parts consumption . For battery-powered systems, most of the boost DC / DC to drive, many manufacturers have introduced specifically for white LED drive thread.
Display circuit: the display circuit generally Timing Controller, Source LCD Driver, Gate Driver composition. Some IC Timing Controller and Source Driver to integrate together, and some IC are integrated into three parts. This three-part integrated circuits are generally inside the TFT LCM, and some TFT LCD Timing Controller IC to put out a (such as SHARP some of the LCD).
SAMSUNG LTV350QV LCD Block Diagram Analysis (as shown): LTV350QV the DRIVER IC is S6F2002,
S6F2002 Integrated Timing Controller, Source Driver, Gate Driver section and power management components, 164RGB X 240 driving ability, so for 320 X 240 QVGA resolution, you need two S6F2002. Two S6F2002, one as the main controller, one as a slave controller, it is precisely because there are two LVT350QV DRIVER IC driver's sake, if the timing with the bad power, it is prone to show abnormal (half of the display is not normal, half of the show normal).
A block diagram of the Taiwan TFT LCD (below): it is driven IC has two pieces, one integrates the Timing Controller and Source Driver, another one is the Gate Driver.
TFT LCD common signal interpretation:
LED_Cathode / LED_Anode: LCD backlight power supply
M / POL: LCD driver polarity model, used to generate VCOM signal
RESET: Global reset signal
CS / SCL / SDI: LCD TCON IC configuration port
DATA [0:23]: LCD RGB24BIT data signal, generally we use 16BIT, as observed by the human eye color and 24BIT 16BIT color is not much different, but 16BIT 24BIT required data to be processed is much smaller than the general the status of the remaining cases we have data cable to connect to high.
HSYNC: Horizontal sync clock signal
VSYNC: Vertical sync clock signal
DOTCLK: pixel clock signal
VDD: digital power supply, usually 3.3V
AVDD: Analog power supply, usually 5V
VGL: GATE OFF control voltage
VGH: GATE ON control voltage
VCOM: LCD common drive electrode
ENABLE: data enable signal
TFT circuit driving principle: sent by the CPU through the LCD interface, the video signal and the timing clock after TCON converter, RGB data through the D / A converter to the SOURCE side, while the shift clock signal driving TCON GATE side strobe line open the line all the transistors, SOURCE capacitor to the LCD, grayscale LCD produce and maintain, through the GATE shift, continue to write the following line of the LCD image, when the whole line of finish, starting from the first line again.
If you always show a static image, the LCD voltage on the electrode would have been the same, when the revocation of voltage, the LCD is difficult to be reinstated, and likely to cause liquid damage. To solve this problem is to change the polarity of the LCD control voltage, that even the static images, the voltage on the liquid crystal electrodes have also been overturned. LCD are used generally in the form of flip line, by changing the voltage polarity of VCOM the public to achieve the purpose of flipping. TCON IC will normally send a signal M or POL, and we use this signal generator VCOM, the general conversion circuit using a non-party circuit have or shipped. VCOM by adjusting the DC side, we can change the color LCD, adjust AC side, you can change the LCD contrast. Perhaps the reason is because the line flip, and some level of LCD will produce stripes (Flicker phenomenon), LTV350QV not very clear, generally more obvious in Taiwan LCD.
Point-screen experience:
Common point screen steps:
1, ensure that the data, clock, power and other connections to normal.
2, to ensure that the work of several groups of LCD power supply VDD / AVDD / VGL / VGH normal.
3, LCD Configuration: Some LCD's TCON IC need to use the SPI interface configuration.
a) configuration is mainly the polarity of the clock signal, scanning direction, and some support CCIR601/656/OSD TCON IC function, according to the actual situation of the main configuration.
b) GAMMA correction: the general parameters provided by the manufacturer under the LCD correction, before the transfer is because the manufacturers give LTV350QV GAMMA parameter is incorrect, resulting in the color display is not normal.
c) SPI time series: general different LCD screen SPI timing and registers, there will be some differences, I usually operate under the register timing diagram (below), by writing to registers, as long as the LCD has responded, that there is little SPI communication problem.
4, the clock setting:
a) general LCD SPEC will be given in the parameters on the timing and sequence diagram, we follow the figure set on it. The following figure: we can know that the clock frequency, pulse width, the first sweep, retrace and so on.
As shown by the picture we can know the HSYNC and VSYNC clock polarity is negative.
Through the following figure we can know is latched data, falling edge of the data
Through the above steps should appear above the LCD screen is beautiful, the image position may also have some bias, but that's okay, look at the screen before scanning the image adjustment, left and right back to sweep up or down to OK.
Image exception handling:
Image color is not normal: it is possible clock polarity model, there may VCOM adjustment is not normal.
Water ripples appear: Make sure the power VDD / AVDD / VGL / VGH ripple is small enough to ensure that the correct waveform VCOM, VCOM circuit side of the power supply stability.
Black and white on the CLP: General TFT LCD on power requirements are more stringent, the timing required in accordance with the Power LCD SPEC
2010年12月16日星期四
LCM suppliers waiting to fight the next wave of market power
By small and medium size LCD panels in 2007 higher than the large size of gross profit, many companies are in production this year will go to the market. However, this led to excessive release of production capacity, coupled with the impact of the global economic downturn, analysts said supply and demand imbalance may lead to small and medium size LCD market this year, volume and price or situation. In addition, large-size LCD market in September despite signs of stabilization have stabilized, but the industry continued to decline in value of the possibility that Q4 is still high. All the face of market weakness to deal with nothing more than adjust the method of production, looking for more of the product mix, lower costs, especially the development of new technologies, develop new products in order to wait for the arrival of the next wave of opportunity. LCM market is. In order to reduce power consumption, LED backlit, MiniVDS, DFR and so become the focus of many module manufacturers a topic of concern. In addition, mobile phones and other small areas after a large number of popular, LCD touch screen is also crept into the large-size applications, the young Chinese companies have to seize this opportunity.
Led the way lower power consumption, LED backlighting gradually from the wind
The so-called LCD module (LCM), refers to the LCD panel, connectors, driver IC, PCB, backlight assembly and the structure of the components together. Increasingly large size LCD end up being more and more troubled by the power. To solve this problem, there are many technologies to choose from the industry, but energy-hungry backlight in the power of the expenditure on the compression is the most important. Currently, the use of LED backlighting instead of CCFL has become the main trend of the industry. IVO's Liya Qin to say that she belongs to the company are gradually replaced with LED backlight CCFL, this alone can reduce the power consumption of LCD display module 2 / 3. Liya Qin said the trend in notebook computers become increasingly evident. "At present, AUO, LG, Samsung is doing it."
However, LCD TV with LED backlight are still not many. DisplayBank report shows that the notebook market penetration rate of LED backlighting is about 13%, while the proportion of LCD TV is small enough to be negligible. Reported that by 2012, the proportion rose to 60% and 15%. Yuwei Long DisplayBank analysts believe that the main reason for the gap between the two laptops on standby power consumption requirements, especially the more urgent. In addition, as used in notebook computers small screen, LED backlight applications will be slightly lower degree of difficulty. Also LED backlighting cost remains high in the LCD TV is not the main obstacle to large-scale use. But as to gradually reduce the cost of this problem will gradually be resolved.
Led the way lower power consumption, LED backlighting gradually from the wind
The so-called LCD module (LCM), refers to the LCD panel, connectors, driver IC, PCB, backlight assembly and the structure of the components together. Increasingly large size LCD end up being more and more troubled by the power. To solve this problem, there are many technologies to choose from the industry, but energy-hungry backlight in the power of the expenditure on the compression is the most important. Currently, the use of LED backlighting instead of CCFL has become the main trend of the industry. IVO's Liya Qin to say that she belongs to the company are gradually replaced with LED backlight CCFL, this alone can reduce the power consumption of LCD display module 2 / 3. Liya Qin said the trend in notebook computers become increasingly evident. "At present, AUO, LG, Samsung is doing it."
However, LCD TV with LED backlight are still not many. DisplayBank report shows that the notebook market penetration rate of LED backlighting is about 13%, while the proportion of LCD TV is small enough to be negligible. Reported that by 2012, the proportion rose to 60% and 15%. Yuwei Long DisplayBank analysts believe that the main reason for the gap between the two laptops on standby power consumption requirements, especially the more urgent. In addition, as used in notebook computers small screen, LED backlight applications will be slightly lower degree of difficulty. Also LED backlighting cost remains high in the LCD TV is not the main obstacle to large-scale use. But as to gradually reduce the cost of this problem will gradually be resolved.
2010年12月14日星期二
RX MCU
The RX MCU family uses a 32-bit enhanced Harvard CISC architecture to achieve very high code density, as well as performance of 1.65 MIPS/MHz. RX MCU is manufactured in Renesas?reliable, time-proven and fast 90nm embedded Flash process, which enables zero-wait execution at up to 100MHz. The RX MCU family, which will expand rapidly, starts within this year with a connectivity stream (30 products), a general-purpose stream (40 products) and an application-specific (ASSP) stream for motor control (15 products). RX MCU microcontroller can be used to control our intelligent UART LCD modules when the application requirement is extremely complicated.
Intelligent UART LCD Module with Serial interface driven by any normal MCU! Anyone can complete TFT display design with minimal MCU programming!
2010年12月13日星期一
Module RGB LCD Controller-S3C2440A driver of the interface TFT LCD
With advances in technology, TFT LCD as display pieces in a variety of embedded systems are more widely used. TFT LCD with touch screen application modules in the system not only for human-machine interface provides high-quality screen display, but also provide a more intuitive, interactive and convenient input. Shenzhen Tianma Microelectronics Co., Ltd. TMT035DNAFWU1 production of 8.89 cm (3.5 in) TFT LCM, the module built-in LCD driver integrated four-wire resistive touch screen and backlight circuit. Samsung S3C2440A based company designed a 32-bit ARM920T core embedded RISC (reduced instructions set computer) microprocessor, and its maximum operating frequency of up to 533 MHz, the internal integration of a common LCD controller, 8-channel 10-bit ADC and touch screen interface and high performance, low-power advantages for smart phones, portable media players, handheld navigation systems and other fields. Embedded System Based on S3C2440A to TMT035DNAFWU1 for the display device, designed TFT LCD driver ic circuit, and complete the next Linux display driver debugging.
2010年12月12日星期日
LED backlight LCD driver can be more easier by our module
Once you want to use lcd, you have to design the circuit panel, usually the LCD driver has to be used, choose the correct type of driver IC is an important task for engineers, there are kinds of display driver in the market, Samsung LCD driver, sharp LCD driver, LG, Philips, etc.
But because of the module, LCD driver is not a headache anymore!.
Our module with a serial of program, which can achieve the aim of drive, any normal MCU can control it, just send the set command the lcd will accordingly to display, no more process has to be done, shorten time for engineers and convenient users. Good quality and excellent service win great reputation from domestic and abroad.
Intelligent UART LCD Module replace the LCD driver, Anyone can complete TFT display design with minimal MCU programming!
2010年12月10日星期五
synlink company
Intelligent UART LCD Module
with Serial interface driven by any normal MCU!
Even without knowledge of TFT drive,
with the Intelligent UART LCD Module ,
anyone can complete TFT display design with minimal MCU programming!
It's simple and easy!
Enables you to focus on development of product core functions,
and Shortens the time to market!
with the Intelligent UART LCD Module ,
anyone can complete TFT display design with minimal MCU programming!
It's simple and easy!
Enables you to focus on development of product core functions,
and Shortens the time to market!
With over 4 years experience, SYNLINK TECHNOLOGY CO LIMITED has great expertise in product development and market operation of the display and the audio and video products, and can provide the complete solution for the customers.
SYNLINK is also an important part of DWIN and is solo responsible for its smart display terminal products in the European market. It manages the product sales, technical support, and provides the customers with complete solutions.
SYNLINK has been focusing on the European market for many years and has won the trust and admiration of the customers. In order to meet the increasing needs, SYNLINK will soon establish a European subsidiary.SYNLINK 's main business includes:
SYNLINK has been focusing on the European market for many years and has won the trust and admiration of the customers. In order to meet the increasing needs, SYNLINK will soon establish a European subsidiary.SYNLINK 's main business includes:
--- Product sale and technical support of Smart UART LCM.
--- Provides the electronic products complete solution and the production.
--- high added-value and Intelligent MCU products
Our target is to develop more products and involve more strength on it in the future.
Corporate Philosophy
With a professional attitude, SYNLINK TECHNOLOGY CO LIMITED announces and insists the following working philosophy:
1 Our highest objectives are based on full customer satisfaction.
To provide our customers satisfactory service, engineering technology supporting, just-in-time goods supplying and administrative efficiency enhancing etc., will all be fulfilled thoroughly through the cooperation. SYNLINK TEC ensures that customers can keep their competitive advantages in the market.
2 we are Aiming to offer intelligent and competitive solutions to customers all over the world through our ongoing technological innovations.
3 SYNLINK TEC is constantly striving to improve our products and processes to reach the highest possible quality standards.
2010年12月8日星期三
A display driver, display device and driving method
display driver (30), including: data line driver circuit DRV-n, in accordance with the display data corresponding to the drive voltage, drive connected to the data line DLn the output line OL-n; The first switching element SW1-n, the first power line connected between the output line; the second switching element SW2-n, the second power line connected between the output line; switch control circuit SWC, for the first, the first second switching element of the switch. In the first period, the first switching element is set to turn the second switching element is set to off; in the second period after the first period, the first switching element is set to off, the second switching element is set to conduction. In the second period, will be the first and second switching element is set to disconnect, and the data line lcd driver ic drives the output line.
2010年12月6日星期一
Smartphones opening feast
iPhone and iPad set off in hot pursuit of global smart phone. Market research firm Gartner recently released a report that the third quarter of 2010, the global end-users up to 417 million mobile phone sales over the third quarter of 2009 increased by 35%, of which smart phone sales grew 96%.
Analysis of the composition iPad, TFT panel, touch-screen components, PCB boards, NAND flash memory, cell phone lithium battery, a microprocessor as its main components. At present, the capacitive touch screen as the focus of market attention. With the hot smart phone, smart phone industry chain-related breakdown of enterprises are also expected to be funded care.
Touch screen: LEYBOLD Tech [56.43 -4.36%] champion
Capacitive touch screen is put on the surface in a layer of transparent glass, a special metal conductive material. When the fingers touch the metal layer, the contact capacitance will change, so connected to the oscillator frequency change, frequency change can be determined by measuring the touch position to obtain information.
Analysis of the composition iPad, TFT panel, touch-screen components, PCB boards, NAND flash memory, cell phone lithium battery, a microprocessor as its main components. At present, the capacitive touch screen as the focus of market attention. With the hot smart phone, smart phone industry chain-related breakdown of enterprises are also expected to be funded care.
Touch screen: LEYBOLD Tech [56.43 -4.36%] champion
Capacitive touch screen is put on the surface in a layer of transparent glass, a special metal conductive material. When the fingers touch the metal layer, the contact capacitance will change, so connected to the oscillator frequency change, frequency change can be determined by measuring the touch position to obtain information.
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