光学膜对LED背光光色变化的影响  

Influence of optical film on the color change of LED backlight

作　　者：钟文馗 林伟瀚 杨梅慧 胡文党 谢沛川 ZHONG Wenkui;LIN Weihan;YANG Meihui;HU Wendang;XIE Peichuan(Shenzhen KONKA Electronic Technology Co.Ltd.,Shenzhen 518107,China)

机构地区：[1]深圳康佳电子科技有限公司,广东深圳518107

出　　处：《液晶与显示》2025年第3期431-438,共8页Chinese Journal of Liquid Crystals and Displays

基　　金：深圳市科技创新委员会项目(No.JSGG20201201100401003)。

摘　　要：Mini LED背光显示产品使用光学扩散板和复合膜进行亮度提升和均匀性提升,光学膜将大幅改变背光的色坐标和亮度参数。本文测试结果表明,复合膜亮度增益在1.5~2倍,亮度增益排序为POP>DPP>MOP>DOP。经分析这是由于不同复合膜对光束立体角的矫正作用引起,即光学微结构对杂散光收集能量大于扩散剂散射产生的能量耗损。同时复合膜大幅提高了背光色坐标,其中扩散板+DPP色坐标变化Δx为0.01,Δy为0.0187,这是由于扩散粒子的Mie散射使短波段蓝光的光辐射能大幅耗损。对于量子点显示,从多层光学微结构反射回量子膜的蓝光将产生多重光致激发现象,使复合膜对xy色坐标值的增幅进一步加大。光学复合膜产生的亮度增益和色温降低有利于显示产品在出厂时将色温调到低色温从而保证显示亮度。Mini LED backlight display products use optical diffusion plates and composite films to improve brightness and uniformity.The test results of this paper show that the brightness gain of composite films ranges from 1.5 to 2 times,with the order of brightness gain being POP>DPP>MOP>DOP.This is due to the correction effect of different composite films on the beam solid angle.At the same time,the composite film raised the backlight color coordinates,with the change in the diffusion plate+DPP color coordinates beingΔx of 0.01 andΔy of 0.0187.Analysis shows that the significant loss of short wavelength blue light radiation energy is caused by Mie scattering of diffusing particles.The blue light reflected back from the multi-layer optical microstructure of the composite film to the quantum film will generate multiple photoexcitation phenomena,further increasing the amplification of the xy color coordinate values of the quantum dot model by the composite film.The color coordinate changes generated by the optical composite film are beneficial for adjusting the color temperature of the display product to a lower color temperature from the factory to ensure display brightness.

关 键 词：次微发光二极管 光学膜 散射 折反射 颜色坐标 

分 类 号：TN27[电子电信—物理电子学] TN141