LCD Display Image Sticking Phenomenon Researching & Solution

• Main Author: 蔡家昌
• Other Authors: 秦弘毅
• Format: Others
• Language: zh-TW
• Published: 2017
• Online Access: http://ndltd.ncl.edu.tw/handle/m62222

碩士 === 明新科技大學 === 電子工程系碩士在職專班 === 105 === Lately these years, liquid crystal displays have been widely applied to many different areas since the associated technologies of TFT LCD (Thin Film Transistor Liquid Crystal Display) were developed and grown rapidly. They also change the ways of set-up of computers, televisions, cell-phones, and pads. Being not compatible with CRT (Cathode Ray Tube) on dynamic responses, TFT-LCD combining the driven IC does well perform like being light, thin, lowly radiative, low power consuming, wide angle viewing, non-geometrically distorted, fully colorful, and well-contrast. TFT-LCD dominantly replaces the traditional CRT and becomes the first priority on the consuming display market. In this thesis, the author is devoted to image sticking and their related investigation. Image sticking should have been one of the main subjects on TFT-LCD. According to the study in the past, few paid attention to the driven waveforms of TFT-LCD Driver IC and the corresponding image sticking. Generally, the time for Burn-in may be as long as 2 hours. In this thesis, the author focuses on the investigation of the ways of solutions of the rear section of the module. There are 4 conclusions out of the results of experiments: （1）Adjust the Vcom among displays to the most optimized conditions, and reduce the level of Flicker as lowly as possible such that the image sticking can apparently improved. （2）Prevent the voltage abnormal writing from over-charging on OE(output enable control). （3）Instead of polar-inversion mode, use dot-inversion by adopting polar interchange to reduce the feed through voltage to as lowly as possible and thus improve the issues of flicker such that the image sticking can be eliminated. （4）To improve image sticking on switching-off conditions, apply a bias lower than 2 volts, simulate the positive power voltage lower than 4 volts, and simulate the negative power voltage lower than -4 volts such that GAS (Gate all select) mode may be started.