Browsing by Author "Fan, Ping-Lin"

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A hybrid temporal and spatial speckle-suppression method for laser displays
(2013-12-16)
Deng, Qing-Long
;
Lin, Bor-Shyh
;
Wu, Pei-Jung
;
Chiu, Kuan-Yao
;
Fan, Ping-Lin
We propose a system that reduces laser display speckles by vibrating the light pipe. A small displacement of the light pipe appears to allow the total reflection of the laser, thereby resulting in a homogenized speckle field that changes with time. In this case, the speckle interference generated by the pattern projected by the laser through the light pipe destroys the spatial homogenization of the laser beams when the light pipe is vibrated. Moreover, when the light pipe begins the sequential vibration, the phases and paths of the beams are changed after the beams traverse the light pipe. Consequently, temporal speckle wavefront superposition can homogenize the luminous intensity distribution of the speckle pattern. This process reduces the speckle contrast to less than 4% while maintaining a luminous intensity of greater than 70%. (C) 2013 Optical Society of America
Design of head-mounted-display eyepiece system of liquid crystal on silicon
(2012-04-01)
Chen, Chien-Yue
;
Ke, Ming-Da
;
Deng, Qing-Long
;
Chang, Yang-Hua
;
Fan, Ping-Lin
The research is aimed at designing an optimized head-mounted-display (HMD) system equipped with two 0.26-inch Liquid Crystal on Silicon display elements for imaging. In order to form an image at a distinct-vision distance of 250 mm, the eyepiece system features 17-times magnification, a 15.63-mm focal length and a 15 degrees field of view. Using the resolution of the human eye as the evaluation standard, we analyze the diminution of aberration and the increase of modulation transfer function, giving the HMD system high resolution as the finishing touches.