改进宽银幕投影显示照明系统的设计方法

照明系统是投影显示系统的重要组成部分，决定着整个系统的亮度和照明均匀性。复眼系统是一种常见的液晶投影显示系统照明结构。传统的复眼照明系统设计方法中，复眼小透镜具有与液晶板相同的长宽比，可以获得能量利用率和均匀性都比较好的照明光斑。但研究发现，利用这种方法设计宽银幕投影显示设备的复眼照明系统，会引起一定的光能损失。针对这一问题，通过对复眼系统设计理论的分析和对实际复眼照明系统的模拟，创新性地提出了在照明系统中引入柱面透镜改变复眼小透镜的长宽比的设计方法，能够有效的提高投影系统能量利用率。模拟计算结果表明，引入柱面透镜的复眼照明系统与传统方法设计的复眼系统相比，能量利用率可以提高5％到10％。

Method for Improving the Performance of Wide Screen Projection Display Illumination System

Illumination system is an important component of projection display system, and decides the whole brightness and uniformity of the whole system. Fly eye system is a commonly used illumination configuration in liquid crystal display (LCD) projectors. In traditional fly eye illumination systems, the elemental lens of fly eye always has the same aspect ratio as the LCD device. But when applied to wide screen projection systems, this will lead to a certain energy loss. This paper presents a new method for improving the performance of wide screen projection display illumination systems, which introduces cylinder lenses. Results of simulation show that a total increment of about 5% to 10% of the output lumens is available with this improved fly eye system.