Tft Lcd Rgb Display Module Design And Testing

TFT LCD not only has excellent performance of high brightness, high contrast, low consumption, long lifetime, small volume, light weight, but also has excellent performance as the same as that of CRT, such as high automatic production, low cost materials, large development and etc. TFT LCD has dominated the flat display market.At present, the interface mode of many LCM (LCD module) products is Bus interface mode, which can be divided into Serial Peripheral interface and Parallel Peripheral interface. It can be used to test TFT LCM products adopting still pictures. With the development of display technology, a lot of middle or large size display screen would be required to display moving picture, so testing LCM with moving picture would evaluate the quality of LCM more effectively. LCM worked in RGB interface mode can display moving picture with low consumption, so RGB interface mode has become the research focus. DE transfer mode is one of RGB interface mode, it can't lay out the advantage of RGB interface mode sufficiently, but it is the beginning of design LCM worked in RGB interface mode.2.83 inch TFT LCM, which works in DE transfer mode, was designed. The TFT LCM including 3 driver IC chips, HD66783×1 as Gate driver, HD66779×2 as Source driver, has 262K colors depth, 240(RGB)×320 dots pixels. The TFT LCM driver signals were enable signal and fiducial clock signal, which were strict with synchronization. Single ARM7 couldn't supply synchronous signals, so test system was developed with CPLD and ARM7. Finally 2.83 inch TFT LCM can display still pictures after debugging.