光配向技术在TFT-LCD中的应用

Application of optical alignment technology in TFT-LCD

本文重点研究了降解型光控取向技术的制作工艺及其对产品性能的影响。通过分析不同光配向工艺参数下配向膜各向异性的数值可知,随着UV光光积量的增大和二次固化时间的延长,配向膜的各向异性值都有先升高后降低的趋势。测试材料在550 mJ/cm^(2)和30 min的条件下,配向能力最优;配向膜材料二次固化温度在250℃以内时对配向性的影响是随温度升高,配向膜的各向异性值有直线上升趋势。通过改变光配向的工艺条件测试TFT特性的变化,发现完整的光配向工艺对TFT特性无明显影响。本文还分析了光配向形成的配向膜的低预倾角(约0.2°)对产品性能的影响,从结果可知,低预倾角下产品的对比度可达到1500以上,与摩擦型产品对比提升了约50%。

The degradable optical alignment technology and its main effects on TFT-LCD are studied.The anisotropy of PI shows a trend from increasing to decreasing as the exposure dose increases and the main curing time extends.The anisotropy of PI,which is a common representation of the alignment ability of PI,performs best at 550 mJ/cm^(2) ultraviolet treatment and 30 min curing time.In addition,the anisotropy of PI keeps increasing as the main curing temperature increases from 230℃to 250℃.Results also demonstrate that the complete optical alignment has no obvious effect on the electrical properties of TFTs.Compared to rubbing process,optical alignment shows huge advantages of contract ratio.The contract ratio of optical alignment product is about 1500,approximately 50%higher than that of rubbing product,due to the low pre-title angle(about 0.2°).