为了扩大公司产品布局, 尽快将RGBW产品推入市场, 本文对该类产品关键的RGBW 彩色滤光片(Color filter, CF)技术进行开发, 并结合公司产线特点, 对RGBW CF技术应用能力提升进行研究。首先通过产线测试, 从高平坦保护膜(Over coating, OC)材料特性、OC厚度设计、OC工艺条件等角度出发, 对该技术的关键特征参数RGB-W段差进行优化, 建立像素尺寸、OC厚度与段差关系的数据模型, 并进行产品验证。接着, 建立段差与液晶盒厚、色温、透过率的关系, 对OC Mura的影响因素进行分析及优化, 降低新技术应用可能造成的产品品质风险。最后, 针对产线特点造成的OC异物高发问题, 通过异物检查机、SEM、显微镜等分析设备对异物发生率及发生原理进行分析, 从材料、工艺参数、设备参数及设备状态等角度制定改善对策, 提升产品良率。最终实现RGB-W段差0.6 μm以下, CF良率99.5%以上。该技术满足产品品质及量产稳定性要求。

In order to increase the production categories of our company and to put RGBW product into market as soon as possible, the key RGBW CF technology was researched. Firstly, through factory verification tests, the key process parameter differences of RGB-W thickness were decreased from the over coating (OC) material characteristics, OC thickness designations, and OC process conditions, etc. the data models of pixel pitch/OC thickness and differences of RGB-W thickness was established. Secondly, the connections among RGB-W thickness differences, cell gap, CCT and transmittance was figured out. The influential factors of OC Mura were analyzed and optimized to reduce quality risks of new technology’s application. Finally, the analytical equipment like AOI, SEM, microscope, etc. were used to analyze the occurrence rate and the reason of foreign body to work out solutions based on material, process parameters and equipment parameters. The results show that the difference of RGB-W thickness is below 0.6 μm,and the CF yield is above 99.5%. This technology can met the requirements of the product quality and the stability of mass production.