摘要
Abstract
Image sticking is one of the most important factors to evaluate the display quality of liquid crystal display(LCD),and most of the engineers studied the material composition and the LCD manu-facturing process to improve the image sticking,but the previous research mostly based on the posi-tive liquid crystal material.In this paper,the image sticking is mainly focused on the negative liquid crystal(LC)material which is driven by fringe electric field.First,the ion density and VHR are meas-ured to compare the stability of the two kinds of LC material,and then the residual DC voltage and theVcom voltage shift of the sample are measured to compare the characteristics of the negative LC with two PI materials so as to select the right combination.The experimental results show that the ion density of the negative LC is 3 9 times as much as the positive LC before UV curing.After UV curing, its ion density is 560 Pc/cm and its VHR variation is 2.7%;the residual DC voltage and theVcom volt-age shift with time of sample A-1 are the largest which use negative LC with PI1 .Its residual DC volt-age is 0.5 V and theVcom voltage shift is 250 mV,and the residual DC voltage of samples which use negative LC with PI2 and positive LC are less than 0.2 V,of which the Vcom variation with time are within 50 mV.The ion density of negative LC material is high,and its stability is worse than positive LC material,image sticking appears in the negative LC material more likely.For the FFS driving mode LCD panel which using negative liquid crystal materials,it is beneficial to use the PI2 material to maintain a low residual DC voltage and low Vcom voltage variation,which are helpful to improve the image sticking.关键词
边缘场切换广视角技术/负性液晶/残像/配向膜Key words
fringe field switching/negative LC/image sticking/polyimide分类
信息技术与安全科学
