Browsing by Author "Pan, Jui-wen"

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An immersive head-mounted display with a liquid lens
(2020-01-15)
Wu, Tsung-Hsien
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Pan, Jui-wen
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光電系統研究所
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影像與生醫光電研究所
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Institute of Photonic System
An optical design for an immersive head-mounted display (HMD) with a liquid lens is described. This design combines the liquid lens with an immersive HMD system to improve the image quality for myopic and hyperopic users. A penta-prism is also incorporated and used to change the direction of the optical path to improve any optical aberration caused by the gravity effect. This immersive head-mounted display has a field of view of 14.9 degrees, focal length of 47.78 mm, and f-number of 5.97 with an exit pupil diameter of 8 mm, eye relief of 15 mm. The value of the MTF is above 0.9 at 3.3 lp/mm.
Designing an anamorphic illumination system with an RTIR prism for a tilt-and-roll-pixel-type projector
(2020-04-20)
Chen, Yu-Jia
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Pan, Jui-wen
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光電系統研究所
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Institute of Photonic System
A relay lens system design for a mini-projector with telecentric illumination is described. The reverse total internal reflection (RTIR) prism for angular magnification and lateral magnification is discussed in detail, and magnifications under different digital micromirror devices (DMD) are compared. The tilt-and-roll pixel (TRP) DMD chip (tilt angle is +/- 17 degrees) is the latest spatial light modulator, and the f-number of the illumination system is 1.71. Using the TRP DMD, the lateral magnification and the angular magnification for the RTIR prism can be increased by 3.77% and 8.73% over that obtainable using the conventional DMD chip (tilt angle is +/- 12 degrees). In order to solve for the angular magnification of an RTIR prism, the baffle is set at the aperture stop of the relay lens system. There is a trade-off between the efficiency and the contrast ratio with the baffle. When B (the position of the baffle) is at 0.11, the contrast ratio of the illumination system is 7590:1 and the efficiency is 57%. The spot size at the edge and corner of the DMD active area is controlled to be less than 250 mu m, and the optical distortion is less than 1%. (C) 2020 Optical Society of America