Development of Adjustable Gamma Compensation Technology for TFT-LCD Circuits Based on Digital Half-Toning Methods

• Main Authors: CHU SHENG LAN, 朱勝嵐
• Other Authors: 宋朝宗
• Format: Others
• Language: zh-TW
• Published: 2006
• Online Access: http://ndltd.ncl.edu.tw/handle/00484873947982627859

碩士 === 中華大學 === 電機工程學系碩士班 === 94 === As the manufacturing technology of LCD system progressing rapidly with each passing day、the size of LCD panel changes very soon in the market. Because of the different characteristics of each panel size and the requirements of high resoluctions for display images、the adjustable Gamma correction technique for improving image quality has to be seriously taken as a key issue and developed urgently. The appropriate brightness to human eyes is presented as Gamma distribution、since the LCD model is characterized by its own non-linearity. There would be some error between expected Gamma brightness and practical brightness produced by traditional driving circuit so that the luminance property of LCD panel doesn’t meet what the human eye expects. This thesis is devoted to study and develop the adjustable Gamma correction technique by appling the fundamental of digital dalf-toning method to improve the Gamma adjustment effect of TFT-LCD under the original construction of driving circuits. First、the driving circuit and the fundamental of TFT-LCD and AM-OLED panel are introduced. Then、the different effects of each Gamma adjustment method are analyzed to evaluate the selection rule of optimizing Gamma distribution for different images. Finally、we emphasize that the image quality is improved by the adjustable Gamma correction technique and the system performance is verified by the pratical demonstrations on FPGA-based platform. Furthermore、the feasibility of the adjustable Gamma correction technology applied to AM-OLED panel is discussed and evaluated.