Design, Optimization, and Evaluation of Image Quality for LCD Rear Projection Screen

• Main Authors: Ching-Yu Tsai, 蔡晴宇
• Other Authors: Han-Ping D. Shish
• Format: Others
• Language: zh-TW
• Published: 1999
• Online Access: http://ndltd.ncl.edu.tw/handle/99739184233808081429

碩士 === 國立交通大學 === 光電工程所 === 87 === Screen is the most direct object of a rear projection system for viewing. Therefore, maintaining the image quality from projection lens is the primary concern in designing a rear projection screen. Brightness, resolution, contrast ratio, and uniformity are among the parameters used in evaluating image quality. Besides, Moire pattern, which would cause uncomfortable feeling while viewing, is also a key point in image quality evaluation. In a LCD rear projection system, Moire pattern is caused by overlapping the periodic structures of LCD, Fresnel lens, and Lenticular lens. The thesis analyzed the Moire pattern of screen and suppressed it by modifying the configuration of the screen. The relationship between the period ratio of each structure and the period of Moire pattern was discussed first by using the spectral analysis method. The occurrence of the Moire pattern was suppressed by achieving the shortest period of Moire pattern. Finally, the image quality of a designed screen was analyzed, then optimized by optical simulation software.