Development of a low voltage source driver for large TFT-LCD system for computer applications

A 3-b digital source driver driven by a single +5-V power source has been developed for large TFT-LCD (thin-film transistor liquid-crystal display) panels already under mass production. The maximum sampling speed of this driver is up to 20 MHz, more than three times as fast as the traditional analog sampling driver. The new driver's LSI chip is a square about 30 mm/sup 2/, smaller than half the square made under the hybrid process. A new technology was developed to drive this driver, i.e., alternating the grey level voltage and also alternating the Vcom inversely with the polarity. With this new driver and its driving mechanism, a 10.4-in CA (computer application) TFT-LCD system has been mass-produced that can generate 512 colors simultaneously for every panel pixel.<>