Design of Driving Circuit for VGA TFT LCD
YANG Hong， TANG Zhi-yong， LING Zhi-hua， HUANG Xi-min ( Changchun Institute of Optics, Fine Mechanics and Physics,Chinese Academy of Sciences, Changchun 130021, China; North Liquid Crystal Engineering Research and Development Center, Changchun 130021
Designing rules of VGA TFT LCD are presented. Line inversion driving method is used in the module and its advantages are described. Principles of data driver and scan driver, realizing of gray scale are also explained. To restrain DC component and the picture flicker due to the parasitic capacitance of TFT, adjustment of Vcom is adopted and the adjustment value is discussed.