提高车载平视显示器观看亮度的微结构膜设计  

Design of micro-structure film for improving viewing brightness of vehicle head-up display

作　　者：庹长富 吕国强[1,2] 徐立业 冯奇斌[2] 王梓 TUO Chang-fu;LÜGuo-qiang;XU Li-ye;FENG Qi-bin;WANG Zi(School of Instrumentation and Opto-Electronics Engineering,Hefei University of Technology,Hefei 230009,China;National Engineering Lab of Special Display Technology,National Key Lab of Advanced Display Technology,Academy of Photoelectric Technology,Hefei University of Technology,Hefei 230009,China;School of Electronic Science&Applied Physics,Hefei University of Technology,Hefei 230009,China)

机构地区：[1]合肥工业大学仪器科学与光电工程学院,安徽合肥230009 [2]合肥工业大学特种显示技术国家工程实验室现代显示技术省部共建国家重点实验室光电技术研究院,安徽合肥230009 [3]合肥工业大学电子科学与应用物理学院,安徽合肥230009

出　　处：《光学精密工程》2021年第8期1822-1831,共10页Optics and Precision Engineering

基　　金：安徽省科技重大专项(No.2019b05050001)。

摘　　要：车载平视显示器可以将驾驶员需要低头查看的信息以虚像的形式直接显示在驾驶员的视线方向上,有效地减少因视线偏离驾驶方向导致的交通事故。当前的平视显示器产品在其眼盒(Eyebox)区域以外仍然存在部分虚像,导致Eyebox区域亮度降低、系统光效不高等问题。本文以像源图像单列像素点的散射角度作为设计单元,设计了一种光学微结构薄膜来调控投影光线的方向,将投影光线更多地聚集于Eyebox区域内。对该微结构膜进行了建模仿真、实际加工和实验测试,测试结果表明Eyebox区域上的平均亮度提高了31.7%左右。该方法可有效提高平视显示器的观看亮度和系统光效,一定程度上减少了Eyebox区域外的杂散光线,减少了驾驶室内的光污染。Vehicle head-up displays can directly display information required by a driver to view the direction of the driver’s sight line as a virtual image,which effectively reduces traffic accidents caused by sight deviation from the driving direction. Current head up display products have some virtual images outside the eyebox area,which leads to problems of low brightness in this area and low light efficiency of the system. We take the scattering angle of single row pixels in the source image as the design unit and design an optical microstructure film to control the direction of the projection light,so that the projection light is more concentrated in the eyebox area. The test results indicate that the average brightness of the eyebox area increased by 31. 7%. This method can effectively improve the viewing brightness and system lighting efficiency of the head up display and reduce both light pollution in a cab and the stray light outside the eyebox area.

关 键 词：平视显示器 微结构 眼盒 系统光效 

分 类 号：TN141.9[电子电信—物理电子学]