Analysis and reduction of dark zone in ultra‐thin wedge‐plate displays |
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| Authors: | Yi-Kai Cheng Sen-Nien Chung Jyh-Long Chern |
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| Affiliation: | Department of Photonics, Institute of Electro-Optical Engineering, Microelectronics and Information Systems Research Center, National Chiao Tung University, Hsinchu 300, Taiwan |
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| Abstract: | Abstract— A wedge plate can be used as the screen of a display, and the thickness of the display can be incredibly thin. In this paper, a basic formula for ray tracing in such a wedge plate is deduced. The fundamental limitation on the display quality of a wedge plate is explored, and the formation of a dark zone on the display screen is analyzed and verified numerically. Experimental exploration and confirmation of one 14‐in. acrylic wedge plate with a white‐light‐emitting diode is also provided. Two approaches to eliminate the dark zone are proposed, and the corresponding numerical demonstration of a 52‐in. wedge‐plate display is also shown. |
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| Keywords: | Wedge‐plate display projection dark zone |
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