Mechanism Research About Flicker in TFT-LCD

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.