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.