高PPI产品下的取向膜画面品质改善研究

为了实现TFT LCD高PPI产品的高分辨率,高开口率,低功耗全面提升,分析了不同因素的影响程度,加强了对取向膜印刷品质的管控。同时对涉及该过程相关因素进行研究分析。对取向膜画面品质相关的产线印刷和干燥条件、APR版制作工艺、取向膜膜厚变化、APR版线数开口率进行优化测试,找到了可以提高取向膜画面品质的方法。实验结果表明:通过对取向膜印刷和干燥条件优化,确定了TN产品画面品质提升的产线管控方案;在APR版制作过程中引用扩散保护膜,ADS产品Particle类不良降低2%,Scratch类不良降低1%;对取向膜膜厚提升,ADS产品的段差和残像得到改善,对比度提升30~120,Zara Particle不良降低30%;通过对APR版的网点,开口率优化:400L,30%,普通曝光的APR版更新为600L,20%,高PPI有机膜类产品的Sand Mura发生率降低为0%。可以满足高PPI产品对取向膜印刷稳定的管控要求,适应高分辨率、高开口率、低功耗等要求。

Research on improving picture quality of alignment film

In order to achieve a higher resolution, higher aperture opening ratio, low power consumption TFT LCD product, the impact of different factors was analyzed. The alignment film printing quality control was strengthened, meanwhile factors involved in the process were researched and analyzed. The printing and drying conditions of alignment film, the production process of APR plate, alignment film thickness change and contraction rate, opening Ratio of APR were optimized. The method was found to control PI printing quality. Experimental results indicate that: the production line management and control scheme of TN product image quality improvement was determined by optimizing the film printing and drying conditions. APR protection film can improve Zara Particle 2% reduction, Scratch 1% reduction. Based on the orientation film thickness promotion, product segment difference and Image Sticking can be improved, meanwhile the contrast was improved 30-120 and Zara Particle 30% reduction. Through the optimization of APR mesh and opening rate, the incidence rate of sand mura was reduced to 0%.