液晶显示用量子点扩散板的研究进展  

Research progress of quantum-dot diffuser plate for liquid crystal display

作　　者：叶道春 谢洪兴 李思杰 季洪雷 许怀书 李阳 孙磊[4] 陈恩果 徐胜 叶芸 严群 郭太良 YE Dao-chun;XIE Hong-xing;LI Si-jie;JI Hong-lei;XU Huai-shu;LI Yang;SUN Lei;CHEN En-guo;XU Sheng;YE Yun;YAN Qun;GUO Tai-liang(National&Local United Engineer Laboratory of Flat Panel Display Technology,College of Physics and Information Engineering,Fuzhou University,Fuzhou 350108,China;Fujian Science&Technology Innovation Laboratory for Optoelectronic Information of China(Mindu Innovation Laboratory),Fuzhou 350108,China;R&D Center,TCL Electronics Co.,Ltd.,Shenzhen 518000,China;Zhicheng College,Fuzhou University,Fuzhou 350002,China)

机构地区：[1]福州大学物理与信息工程学院平板显示技术国家地方联合工程实验室,福建福州350108 [2]中国福建光电信息科学与技术创新实验室(闽都创新实验室),福建福州350108 [3]TCL电子有限公司研发中心,广东深圳518000 [4]福州大学至诚学院,福建福州350002

出　　处：《液晶与显示》2023年第3期304-318,共15页Chinese Journal of Liquid Crystals and Displays

基　　金：国家自然科学基金(No.62175032,No.61904031);福建省科技重大专项(No.2021HZ021001);福建省自然科学基金(No.2021J01579);闽都创新实验室自主部署项目(No.2020ZZ111,No.2021ZR143)。

摘　　要：扩散板作为液晶显示器(Liquid Crystal Display,LCD)背光中不可或缺的重要部件,可起到雾化光线的作用。常见的扩散板主要有表面微结构型与粒子散射型两种,主要性能参数是雾度及透光性,加入量子点的扩散板还具备色转换和改善色彩呈现能力的特性。相较于量子点色彩增强膜,量子点扩散板具有制备工艺更简单、成本更低、雾化能力更高等优势,非常适合于Mini-LED背光源。本文对液晶显示用扩散板的研究进展做了简要概述,并着重介绍了多层结构的量子点扩散板的制备工艺及性能。在稳定性方面,所制备量子点扩散板在高温高湿(60℃/90%RH)环境下可长时间储存,在蓝光照射条件下(中心波长450 nm,45℃/85%RH)的T95寿命超过了1000 h。同时,该量子点扩散板在450 nm蓝光Mini-LED背光照射下的亮度均匀性高于80%,蓝、绿、红光的半峰宽分别小于20 nm、25 nm、25 nm,色域覆盖率达到了DCI-P3标准的99.58%。总之,该量子点扩散板兼具优异的色转换与匀光的功能,且寿命稳定,有望在大中型尺寸液晶显示器中得到大规模应用。Diffuser plate which has the function of scattering light is an important component of liquid crystal display(LCD).The common diffuser plates mainly divide into the type of surface with microstructure and internal particle scattering,whose essential properties are hazing and transmitting light.The diffuser plates with embedded quantum dots also feature color conversion and improve color rendering capabilities.Compared with the combination of a quantum dot enhancement film(QDEF)and a diffuser plate,the quantum dot diffuser plate(QD-DP)has the advantages of simpler preparation process,lower cost,and higher atomization ability,which is suitable for mini-LED backlight.This paper briefly summarizes the research progress of diffuser plate for liquid crystal display,and focuses on the preparation process and performance of a multi-layer QD-DP.In terms of stability,the prepared QD-DP can be stored for a long time in the environment of high temperature and high humidity(60℃/90%),and the lifetime(T95)exceeds 1000 h under blue light irradiation(450 nm,45℃/85%RH).Moreover,the luminance uniformity of QD-DP under 450 nm blue light irradiation is higher than 80%.The half-peak width of blue/green/red light is lower than 20 nm,25 nm,25 nm,respectively.The color gamut area reaches 99.58%of the DCI-P3 standard.In conclusion,QD-DP has excellent functions of color conversion and uniform light coupled with the characteristics of stable lifespan,which is expected to be widely used in large and medium-sized LCDs.

关 键 词：量子点 扩散板 背光 液晶显示 Mini-LED 

分 类 号：TN141.9[电子电信—物理电子学]