Browsing by Author "Ke, Ming-Da"

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Design of head-mounted-display eyepiece system of liquid crystal on silicon
(2012-04-01)
Chen, Chien-Yue
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Ke, Ming-Da
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Deng, Qing-Long
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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.
Pulfrich autostereo display with micro-prism array
(2013-09-09)
Chen, Chien-Yue
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Ke, Ming-Da
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Deng, Qing-Long
;
Siao, Jhih-Kai
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光電系統研究所
A micro-prism film, with spectral characteristics, is attached on a display panel to show images appearing with + 10 degrees similar to + 50 degrees and -10 degrees similar to-50 degrees bright regions and with a + 10 degrees similar to-10 degrees dark region. When both eyes separately receive the bright region and the dark region of an image, interocular delay would appear to generate a stereo perception. With the optical simulation software, LightTools 7.3.0, to simulate the brightness change, the light with lower brightness appears on the 0 degrees region and the light with the highest brightness appears on the +/- 10 degrees region. The optimal viewing distance of 25cm could accurately deliver the image with shading parallax to both eyes. The actual measurement of brightness presents the shading distribution, achieving the condition of binocular retinal illumination, and the angle of visibility appears on the +/- 50 degrees region, causing interocular delay so that the viewer generates the stereo perception. (C)2013 Optical Society of America
The influence of polarized 3D display on autonomic nervous activities
(2014-10-01)
Chen, Chien-Yue
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Ke, Ming-Da
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Wu, Pei-Jung
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Kuo, Chen-Deng
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Pong, Bao-Jen
The spectral analysis of Heart Rate Variability (HRV) can be used for assessing the autonomic nervous activities and further the physiological conditions of subjects. This study intended to explore whether or not people would have fatigue, faintness and other kinds of uncomfortable conditions after watching a 3D film by using HRV measures as the objective physiological indices, in addition to other subjective physiological indices. Twenty men aged 22 +/- 2 experienced watching 3D films and 2D films and were served as the controls of themselves. As the controls, the subjects had to rest at the same place. All subjects were are randomized for taking different experiences, and the electrocardiographic (ECG) signals were recorded during the whole process. The researchers could obtain the indices of the autonomic nervous activities before and after experiencing 3D and 2D movies with the help of spectral HRV analyses, along with the objective physiological information. The subjects were requested to fill out the questionnaire for the subjective feelings after the movie experiences. It was found that the subjects\' high-frequency power (HFP) representing parasympathetic nervous activities decreases after watching a 3D film. The sympathetic and parasympathetic nerve activities before and after watching a 2D film were not significantly different. The subjects complained that they felt dizzy, had headaches, and got visual fatigue while watching a 3D film. This study found that the subjects\' parasympathetic nerve activities were reduced after watching a 3D film, indicating that watching a 3D film would make people uncomfortable and tired. This result was the same as that of the questionnaire. Thus, HRV analyses could be an objective physiological index for discomfort as viewing 3D films. (C) 2014 Elsevier B.V. All rights reserved.
The Investigation on Physiological Influences and the Working Efficiencies of Several Lighting in Market
(2013)
Chen, Chien-Yue
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Ke, Ming-Da
;
Wu, Jeng-Han
;
Wu, Pei-Jung
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光電工程學系
Human physiological and psychological changes could be acquired by biofeedback instruments and self-report questionnaire. People are likely to generate various physiological and psychological changes when situating distinct lighting. For this reason, this study aims to discuss the effects of environments with different light sources, such as reading, practical training, working, and sleeping, on human heart rate variability. It is expected to inspect the effects of commercial light sources on human body through the measurement and experiment and further find out the suitable light sources in various environments.