液晶与显示, 2013, 28 (4): 567, 网络出版: 2013-08-28
TFT-LCD中画面闪烁的机理研究
Mechanism Research About Flicker in TFT-LCD
薄膜晶体管液晶显示器 闪烁 光照漏电流 公共极电压漂移 电压保持特性 TFT-LCD flicker photo-Ioff Vcom shift voltage holding characteristic
摘要
画面闪烁是TFT-LCD的重要缺陷。文章通过一系列的实验, 观察了Photo-Ioff、Vcom、Flicker、Vgs之间的关系, 并给出了机理解释。Vgs的变化产生ΔVp, 导致Vcom的漂移, 形成闪烁, 但如果Vcom的均匀性较好, 这种闪烁理论上可以通过Vcom调整消除。Photo-Ioff造成在正、负极性电压下像素的电压保持特性不同, 引起Vcom进一步的漂移和闪烁。通过降低Photo-Ioff和提高Vgl, 可以改善闪烁现象。
Abstract
Flicker is the serious defect of TFT-LCD. In this paper the relations among photo-Ioff, Vcom, flicker and Vgs had been observed through a series of experiments, and the mechanism explanation is demonstrated. The change of Vgs brings ΔVp, results in the shift of Vcom and flicker, however, this kind of flicker can be avoided theoretically by the Vcom adjustment if the uniformity of Vcom has no problem. The pixel’s voltage holding characteristic has difference between the positive and negative frames due to the Photo-Ioff, so the further shift of Vcom and flicker are happened. The flicker phenomena can be improved by decreasing the value of Photo-Ioff or increasing the Vgl.
林鸿涛, 王明超, 姚之晓, 刘家荣, 王章涛, 邵喜斌. TFT-LCD中画面闪烁的机理研究[J]. 液晶与显示, 2013, 28(4): 567. LIN Hong-tao, WANG Ming-chao, YAO Zhi-xiao, LIU Jia-rong, WANG Zhang-tao, SHAO Xi-bin. Mechanism Research About Flicker in TFT-LCD[J]. Chinese Journal of Liquid Crystals and Displays, 2013, 28(4): 567.