LCD液晶层电场的响应特性分析

分析了液晶显示器在实际生产中时常出现的图像残留问题产生的原因，从理论上推导出了上下基板取向层与液晶分子交界面积累的累积电荷在液晶盒中产生的电场强度的定量关系．研究表明，当取向层PI的介电常数与电导率的比值和液晶的不相等时二者的交界面将产生电荷积聚；当其介电常数与电导率的比值相差越大时，图像残留越严重；当其驱动电压越大时，图像残留也越严重；当取向层的介电常数与电导率的比值和液晶的相等时二者的交界面将不产生电荷积聚，图像残留、显示速度减慢等问题也得以基本消除．本研究从理论上为解决液晶显示器的图像残留问题指出了方向．

ANALYSIS OF THE CHARACTERISTIC RESPONSE OF ELECTRIC FIELD IN LCD

At present, the response speed of liquid crystal display has been significantly improved,but the motion blur, caused by moving objects blur or smear phenomenon, is always the prominent problem of liquid crystal display technology when showing the dynamic image of the high-speed movement of objects, so research of image sticking is very important to theory and practical production of LCD. In this paper, image sticking is introduced which often occurs in practical production of LCD, then its factors are analysed theoretically. Quantitative relation of electric field intensity is also derived which is generated by accumulated charge in the LC cell. It is found that accumulated charge will be produced in the interface when the ratio of dielectric constant and conductivity for alignment layer and LC layer doesn＇t equal to each other. If difference value of the ratio is bigger, image sticking is more seriously. Image sticking becomes serious with driving voltage increasing. If the ratio of dielectric constant and conductivity for alignment layer and LC layer equals to each other, no charge will be accumulated; problems such as image sticking, slow response etc. can be eliminated thoroughly. Related research points out orientation for solving image sticking of LCD theoretically.