Browsing by Author "Chien, KW"

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3-D mobile display based on dual-directional light guides with a fast-switching liquid-crystal panel
(2005-10-01)
Chu, YM
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Chien, KW
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Shieh, HPD
;
Chang, JM
;
Hu, A
An autostereoscopic display based on dual-directional light guides with a fast-switching liquid-crystal panel was designed and fabricated to provide better 3-D perception with image qualities comparable to that of 2-D displays. With two identical micro-grooved light guides, each with a light-controlled ability in one direction, two restricted viewing cones are formed to project pairs of parallax images to the viewer's respective eyes sequentially. Crosstalk of less than 10% located within +/- 8 degrees-+/- 30 degrees and an LC response time of 7.1 msec for a 1.8- in. LCD panel can yield acceptable 3-D perceptions at viewing distance of 5.6-23 cm. Moreover, 2-D/3-D compatibility is provided in this module.
Design and fabrication of an integrated polarized light guide for liquid-crystal-display illumination
(2004-03-20)
Chien, KW
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Shieh, HPD
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光電工程學系
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Department of Photonics
An integrated polarized light guide was designed and fabricated for use as a liquid-crystal backlight with emphasis on uniformity of the light and conversion of p-polarized to s-polarized light. Two different micro-optical structures were fabricated both on the top and the bottom surfaces of the light guide. On the top surface, a subwavelength grating separates s-polarized and p-polarized light to achieve a polarization-conversion efficiency of 69%. A 1.7 gain factor of polarization efficiency was obtained to increase the utility of light for liquid-crystal illumination. (C) 2004 Optical Society of America.
Efficient polarized backlight for transflective liquid crystal display illumination
(2005-04-01)
Chien, KW
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Shieh, HPD
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Cornelissen, HJ
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光電工程學系
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Department of Photonics
A collimated backlight was designed for high-efficiency transflective liqud crystal display (LCD) illumination. Additionally, polarization separation was achieved by selective total internal reflection at microgrooves in polymeric foils, which were stretched to be anisotropic materials for easy fabrication and tunable birefringence. A lenticular lens array was then utilized to collect the collimated light of the polarized backlight to further improve light utilization efficiency. Therefore, gains of 2.91 and 1.37 in light utilization efficiency were obtained for transmissive and reflective modes, respectively.
Polarized backlight based on selective total internal reflection at microgrooves
(2004-08-20)
Chien, KW
;
Shieh, HPD
;
Cornelissen, H
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光電工程學系
;
Department of Photonics
A polarized backlight for LCD illumination is designed and fabricated in which s-polarized light is extracted owing to selective total internal reflection at microstructures in the anisotropic layer. From the measurement, the contrast ratio in normal viewing direction can be as high as 64. Luminous uniformity of higher than 80% is achieved for polarized backlights. Furthermore, 1.6 gain in efficiency is obtained aiming for high-efficiency LCD illumination. (C) 2004 Optical Society of America.
Time-multiplexed three-dimensional displays based on directional backlights with fast-switching liquid-crystal displays
(2006-05-01)
Chien, KW
;
Shieh, HPD
;
光電工程學系
;
顯示科技研究所
;
Department of Photonics
An autostereoscopic display using a directional backlight with a fast-switching liquid-crystal (LC) display was designed and fabricated to obtain a better perception of 3D images by enhanced resolution and brightness. A grooved light guide in combination with an asymmetric focusing foil was utilized to redirect the emitting cones of light to the left and right eyes, respectively. By designing the groove structures of the focusing foil with rotation from -1.5 degrees to 1.5 degrees in the gradient and having the pitch ratio of the grooved light guide to the focusing foil of less than 3, the boundary angle then shifts from normal viewing and the moire phenomenon can be suppressed. Cross talk of less than 6% and a LC response time of faster than 7.1 ms further improve the stereoscopic image perception. Additionally, 2D-3D compatibility is provided. (c) 2006 Optical Society of America.