微型投影机光学引擎的研究

Study on the Optical Engine of the Mini-Projector

设计了一种针对个人用户使用的微型投影机光学引擎，系统为单片式数字光线处理器结构，采用红绿蓝三色大功率高亮度发光二极管作为光源，使用X棱镜作为合色元件，从而实现38．1～50．8cm的彩色投影显示。对设计结果进行理论分析后可知，设计结果满足投影显示对颜色的要求，光学引擎的理论效率为16．1％。同时利用Light Tools仿真软件对系统进行建模分析，300万条光线追迹仿真的结果表明，光学引擎的效率为14．6％，与理论分析结果基本符合，屏幕上光通量为22．81m，其美国国家标准协会规定的九点照度均匀性达到91．55％和-93．36％，满足设计要求。

An optical engine of the mini-projector suitable for the personal use is designed. It is a single panel digital light processor （DLP） system by using LED as its illuminator and X prism as its mix-color device, which can provide a 38.1～50.8 cm color projection display. The theoretical analysis shows that the design can satisfy the need of the color projection display with the system efficiency 16.1%. The simulation by using the software is LightTools made. After three million rays are traced, it shows that the efficiency of the optical engine is 14.6 % with flux 22.8 lm on the screen. The simulation results coincide with the theoretical analysis of the system efficiency. The ANSI nine-point uniformity of the screen is 91.55 %, --93.36 %, which can reach the specification of the design.