Abstract
In this paper, a novel light separator with contrast ratio enhancement but maintaining the optical efficiency of the DLP projection system is proposed. The main capability of the novel light separator is to direct the uncontrolled light away from the image system. The working theorem for the novel light separator is derived as well. Uncontrolled light is kept away from the image system by a total internal reflection surface, thereby effectively improving the image quality. Compared with the conventional contrast ratio enhancement method, the FO:FO contrast ratio can be improved from 839:1 to 48250:1, the ANSI contrast ratio can be improved from 180:1 to 306:1, while the image system efficiency remains at 76.2%.
Highlights
Nowadays, the projector is an important feature of the devices people use in their daily life, and portability is an important factor, especially in small devices such as mobile phones [1]
Liquid Crystal Display (LCD), Liquid Crystal on Silicon (LCOS), and Digital Light Processing (DLP) are the main technologies used in the projectors
Comparison with the conventional contrast ratio enhancement method shows an improvement in the full-on/full-off (FO:FO) contrast ratio, from 839:1 to 48250:1, the American National Standards Institute (ANSI) contrast ratio can be improved from 180:1 to 306:1, while the image system efficiency remains at 76.2%
Summary
The projector is an important feature of the devices people use in their daily life, and portability is an important factor, especially in small devices such as mobile phones [1]. The DLP projection system has many applications with better optical efficiency and a smaller system size than other display systems This is possible because the DMD system does not use polarized light. Adding an asymmetric aperture to the image system is one common method to increase the contrast ratio and maintain the optical efficiency of DLP projection systems [12, 13]. We propose a novel light separator design to be used instead of an asymmetric aperture to increase the contrast ratio and maintain the optical efficiency of the DLP projection system. The proposed novel light separator design does effectively increase the contrast ratio and maintains the optical efficiency of the DLP projection system. The test results show the system with the novel light separator to have an FO:FO contrast ratio of 4025:1 and an ANSI contrast ratio of 275:1
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