液晶与显示2018，Vol.33Issue(3)：195-201,7.DOI:10.3788/YJYXS20183303.0195
LCD面板TFT特性相关残像研究
Influence of TFT character on LCD image sticking
许卓 1金熙哲 1吴海龙 1周焱 1张智 1闵泰烨 1袁剑峰1
作者信息
- 1. 重庆京东方光电科技有限公司产品技术部,重庆400700
- 折叠
摘要
Abstract
Image sticking(I.S.)is a main factor that lowers the display quality in TFT-LCD,and it is also the most complicated issue that occurred on LC display.In this study,measuring method of I.S. level is proposed,and experiments are performed to find the relationship between image sticking and TFT transfer curve.The feature of AC image sticking is discovered,and the mechanism of the image sticking is obtained.By analyzing the luminance and TFT Ioff(Leakage current at TFT off state)on white(W)and black(B)area at chessboard image and comparing the simulation results,we find that the recharging difference of pixels on W and B area,which can be result in different pixel holding volt-age(ΔV>12.5 mV),is responsible for image sticking.Based on this mechanism,we introduced two methods to improve image sticking.One way is to lower the TFT Ioff(<50 pA)and stabilize the TFT character during a-Si formation process,which can effectively decrease the shift of TFT transfer curve during the I.S.image aging.Another way is to adjust the gate low voltage(VGL)to a proper value that can deviate from the peak of Δ Ioffcurve of W and B area.This two methods is proved to solve the AC image sticking effectively(Δ L<0.5 cd/m2).关键词
残像/薄膜晶体管/交流驱动/漏电流/保持电压Key words
image sticking/TFT/AC driving/leakage/holding voltage分类
信息技术与安全科学引用本文复制引用
许卓,金熙哲,吴海龙,周焱,张智,闵泰烨,袁剑峰..LCD面板TFT特性相关残像研究[J].液晶与显示,2018,33(3):195-201,7.
