The study of increase effective bits for the TFT LCD source driver

• Main Authors: Chin-Hung Hsu, 徐錦鴻
• Other Authors: Chun–Chin Chen
• Format: Others
• Language: zh-TW
• Published: 2006
• Online Access: http://ndltd.ncl.edu.tw/handle/96676342853827519082

碩士 === 中原大學 === 電子工程研究所 === 94 === Under the request of high display quality, low EMI, and low power consumption, TFT LCD has become the main stream of displays. The market share of CRT, was the top 1, is dropping rapidly in past few years. From the development trend of TFT LCD, we can find some major requests to TFT LCD from consumers listed as follows. 1.Larger panel size. The largest LCD TV size is 100 inches. 2.Higher resolutions. The resolution of high end LCD TV is 1920 x 1080. 3.Better display quality. Under the TFT makers continue improve, TFT LCD can provide high brightness, high contract, high response time, and more color depth. From the above view of points, we know that TFT LCD provides more advantages than CRT. Furthermore, TFT LCD provides lower price than before. That is the reason why TFT LCD has become the main stream of displays now. Source driver is the input of TFT LCD. It controls the display performance and color depth of TFT LCD. In addition, a TFT LCD panel needs several pieces of source driver to drive the panel. It shares most cost in the driving system. Thus all the driver IC design houses focus on the improvement of source driver. That is also the reason why I chosen source driver for my research target. The purpose of this dissertation is to increase the output resolution of source driver and gain more color depth by Ohm’s law. Meanwhile, this improvement must keep the cost competitively. For example, if we use 6 bit source driver, we can get more than 64 voltages by gamma voltage control. From the result of this research, it has been proved that we can increase effective bits for the TFT LCD driver by Gamma Voltage Control. This answers the purpose of the study.