Browsing by Author "Ouyang, Shi-Hong"

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High directional backlight using an integrated light guide plate
(2015-01-26)
Wang, Yi-Jun
;
Ouyang, Shi-Hong
;
Chao, Wei-Chung
;
Lu, Jian-Gang
;
Shieh, Han-Ping D.
A high directional backlight system that combined a composite microstructure light guide plate (LGP) with a collimated light source was proposed for eco-displays. The collimated planar light was expanded from a point light source and guided towards the normal direction by utilizing the micro-prism array on LGP. High uniformity of spatial luminous, 91%, with a narrow viewing cone of +/- 4 degrees can be achieved without additional optical films. Moreover, compared to the conventional backlight, only 5% of power consumption was needed to keep the same luminance, hence, the optical efficiency increased by a factor of 1.47. (C) 2015 Optical Society of America
Light extraction from electroluminescent devices using micro-rod array embedded within glass substrate
(2015-07-27)
Wang, Yi-Jun
;
Ouyang, Shi-Hong
;
Lu, Jian-Gang
;
Shieh, Han-Ping D.
;
光電工程學系
The total internal reflection (TIR) effect in conventional electroluminescent devices causes a large amount of light energy trapped in the devices and result in heat energy that adversely affects the performance of the device. In order to enhance the light out-coupling efficiency without sacrificing the electrical properties, a micro-rod array (MRA) structure fabricated by a femtosecond laser was demonstrated. Green, blue, and red organic light-emitting diodes were employed to verify the effect of the proposed method, which increases out-coupling efficiencies by a factor of 1.9, 1.7, and 1.82, respectively, compared with conventional devices. This highly effective method is compatible with current device fabrication processes and is applicable to full-color electroluminescent devices. (C) 2015 Optical Society of America