应用于液晶显示背光的量子点光转换膜研究进展

Research progress of quantum dot light conversion films for backlight in liquid crystal displays

胶体量子点由于具有宽吸收、窄发射、可溶液加工等优异光学特性,可以赋能液晶显示技术实现高色域的画质效果而获得越来越多的产业应用,目前应用范围较广的产品为量子点光转换膜。典型的量子点光转换膜为上下阻隔膜加中间量子点树脂的三明治结构:上下阻隔膜起到隔绝水、氧,实现保护量子点中间层的作用;量子点树脂层为实现量子点光转换效果的重要载体,一般包含红色和绿色量子点材料,在背光蓝色LED的激发下发射红光和绿光,并与透过的蓝光一起实现R/G/B的三基色白光,可以实现100%NTSC以上色域覆盖。量子点光转换膜从最开始昂贵的高阻隔(10^(-3)~10^(-4)g·m^(-2)·day^(-1))方案逐渐发展为高性价比的较低阻隔(10^(-1)g·m^(-2)·day^(-1))技术方案,进而使产品应用得到普及。其产品形态也从最开始的大尺寸电视产品1397~2159 mm(55~85 in),逐步渗透到显示器、笔记本、车载、平板、VR以及可穿戴等中小尺寸显示产品等。因其能够大幅提高产品的色彩显现力和产品附加值,从而获得品牌客户和消费者越来越多的认可。本文从量子点光转换膜的结构、功能着手,综述了量子点光转换膜的技术发展过程、最新的研究进展、标准研制情况以及市场发展趋势等。

Colloidal quantum dots(QDs),due to their excellent optical property,such as broad absorb range,narrow emission and solution processability,have received more widespread application in liquid crystal display,enabling the wide color gamut,with quantum dot light conversion film(Q-LCF)as the main commercial product.Typical Q-LCF structure is a sandwich structure with a layer of QD containing resin between two barrier films.The barrier film plays the role of preventing the QD resin from water and oxygen to protect the QD,the key material to realize the optical conversion performance.Generally,QD resin includes red and green quantum dots,which emit red and green light under the excitation of the backlight blue LED,and achieve RGB three primary colors,together with the transmitted blue light.The Q-LCF has gradually developed from using the expensive high grade barrier films(10^(-3)~10^(-4)g·m^(-2)·day^(-1))to the cost-effective low grade barrier films(10^(-1)g·m^(-2)·day^(-1)),which makes the Q-LCF spencentrating widely in LCD products,starting from large size TV products 1397~2159 mm(55~85 in),to monitor,laptop,automotive tablet,VR display and wearable products.For its greatly improved the color display capacity and added value of products,the Q-LCF has gained more and more recognition from brand customers and end users.Based on the structure and function of Q-LCF,this paper reviews the technological development process and discusses the latest research progress,technology,standard and market development trend of Q-LCF.