TFT-LCD高温残像的改善

Improvement of high temperature image sticking of TFT-LCD

为了消除TFT-LCD的高温残像,改善液晶屏的影像残留状态,采用非对称调整正负Gamma电压的方法进行量化研究。针对液晶屏残像不良问题,阐述了产生残像的基本电路原理,提出一种快速调整正负Gamma电压的方法。通过预先测试液晶屏的常温和高温Flicker值,来确定液晶屏的Vcom电压变化值。依据Vcom电压变化的值调整液晶屏的正负Gamma电压,从而实现量化调整正负Gamma电压的理论值,最终达到消除残像的效果。实验结果表明,此方法测试验证的残像等级从L1降到L0.5,基本上可以达到量化调整正负Gamma电压,降低残像等级的目的。

In order to eliminate the image sticking in high-temperature of TFT-LCD,a method to improve image performance by adjusting the positive and negative Gamma voltage and a quantitative research is conducted.The method of asymmetric adjustment of positive and negative Gamma voltage is quantified.Aiming at the problem of image sticking in the LCD field,an electrical principle is analyzed,which is the reason why the image sticking is inevitable in LCD,and a method to quickly adjust the positive and negative Gamma voltages is proposed.The Flicker value is measured in a normal or high temperature environment to determine the variation of Vcom voltage.According to this variation,the positive and negative Gamma voltage of the LCD are ajwsted,so as to realize the quantitative theoretical value to adjust Gamma voltage,and finally achieve the goal of eliminating the residual image.The experimental result shows that the residual image level is reduced from L1 to L0.5 by this method.