Ultra-thin Rear Projection Display System Design And Research

Projection display is the only practical method to build up large screen display system, when large screen display is becoming more and more important in the research of display technology recently. In addition, Rear projection display technology with its unique advantages plays an important role in large screen projection display technology. Whereas, the large volume and heavy weight are fetal to the system, which are crucial factors to evaluate it. This paper focuses on the design and study on thin rear projection display system.Different kinds of projection display systems are presented in this paper. Five rear projection display technologies: CRT, LCD, LCLV, LCOS and DLP, which are occupying the most part of the projection display market, are compared in their configuration, image brightness, contrast, uniformity, resolution, in order to show out the advantages and disadvantages of each techniques.Different system and screen structures were analyzed in this paper. In addition, the important factors to evaluate the performance of the projection image were summarized. Two methods were given to make the rear projection display system thinner than the common rear projector system, one of which was to form better optical system, and the other was to use double-functional screen.Two methods to build up thin rear projection display system were studied in details in this paper. It first reports a flat wedge of rear projection display system. The elements of optical system was explained, where on axis lights and off axis lights were analyzed separately. According to the analysis, a large screen system was simulated in C++. A new kind configuration was put forward by using in flat wedge, to make a practical thiner system, and simulated in ASAP. It presented a projected image from simulated grid source, and the real experiment of the system. In addition was the evaluation of the image in experiment. The second method, a new design of rear projection display system and double-functional screen to make the system thinner than ever was designed. After analyzing the structure of the system andthree-prism micro-structured screen, this new system was simulated in ASAP. Then, the distortion, uniformity and illumination of the image on the screen were gained.