Browsing by Author "Wang, Yi-Jun"

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A Novel Architecture for Autostereoscopic 2D/3D Switchable Display Using Dual Layer Strip Patterned OLED Backlight Module
(2014-05-01)
Wang, Yi-Jun
;
Liu, Jun
;
Tan, Jian
;
Yang, Bo-Ru
;
Ding, Wei-Xian
A novel backlight module that integrates dual layer strip patterned organic light emitting diode (DLSP-OLED) for 2D/3D switchable display was demonstrated. The DLSP-OLED functions as a parallax barrier in 3D mode and a planar light source in 2D mode. The results indicated that the backlight module with a thin form factor (similar to 1.1 mm) can achieve uniformity of 91% in 2D mode, and increased optical efficiency by a factor of 2.8 with a crosstalk of less than 6% in 3D mode, compared with the conventional 2D/3D switchable display. A fast switching rate (<1 ms) with simple operation can eliminate the visual fatigue caused by flicker during the switching. In addition, this configuration can function localized 3D display by modulating the DLSP-OLED individually.
Blue Phase LC/Polymer Fresnel Lens Fabricated by Holographics
(2014-02-01)
Tan, Jian
;
Song, Yue
;
Zhu, Ji-Liang
;
Ni, Shui-Bin
;
Wang, Yi-Jun
A novel fabrication method using holographic exposure for switchable blue phase (BP) liquid crystal (LC)/polymer Fresnel lens was demonstrated. The Fresnel pattern can be achieved by interfering a planar and a spherical wave fronts with a 532-nm laser. The BPLC/polymer Fresnel lens can thus be fabricated without photo mask and controlled with a simpler driving compared with the conventional LC Fresnel lens.
Efficiency Enhancement of Organic Light-Emitting Diodes on Flexible Substrate With Patterned Inverted Conical Structure
(2016-02-01)
Wang, Yi-Jun
;
Lu, Jian-Gang
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Shieh, Han-Ping D.
;
光電工程學系
;
顯示科技研究所
The total internal reflection effect in conventional electroluminescent devices causes a large amount of light energy to be trapped in devices and induces heat energy that adversely affects the performance of the device. To enhance the light outcoupling efficiency without sacrificing the electrical properties, a patterned inverted conical (PIC) structure fabricated by a focused femtosecond laser on a flexible substrate was demonstrated. Compared with the conventional flexible organic light-emitting diode (OLED), the OLED with the PIC structure exhibited a current efficiency increase of a factor of 2.6 with no emission spectrum altered. In addition, the flexible OLED with PIC substrate can avoid the mirror reflection effect under the strong ambient light for a better visual experience. This highly effective method is compatible with the current device fabrication process and is applicable for full-color OLED display and lighting.
High directional backlight using an integrated light guide plate
(2015-01-26)
Wang, Yi-Jun
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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
One Glass Single ITO Layer Solution for Large Size Projected-Capacitive Touch Panels
(2015-09-01)
Liu, Shi-Yu
;
Li, Wei-Huan
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Wang, Yi-Jun
;
Lu, Jian-Gang
;
Shieh, Han-Ping D.
One glass single ITO layer solution has been demonstrated for large size projected-capacitive touch panels. Using simple touch sensors and algorithm, the proposed solution can effectively solve the issues of sensitivity reduction and large coordinate shifting existing in current large size touch panels. A touch system based on the proposed solution can achieve a coordinate shifting of less than 1.5%.
Switchable viewing angle display with a compact directional backlight and striped diffuser
(2015-08-10)
Wang, Yi-Jun
;
Lu, Jian-Gang
;
Chao, Wei-Chung
;
Shieh, Han-Ping D.
;
光電工程學系
A compact high-directionality backlight module combined with a striped diffuser is proposed to achieve an adjustable viewing angle for ecodisplay. The micro-prisms on the compact light guide plate guide the emitting rays to the normal viewing angle, whereas a set of striped diffusers scatter the rays to a wide viewing angle. View cones of +/- 10 degrees/+/- 55 degrees were obtained for narrow/wide viewing modes with 88%/85% uniformity of spatial luminance, respectively. Compared with the conventional backlight, the optical efficiencies were increased by factors of 1.47 and 1.38 in narrow and wide viewing modes, respectively. In addition, only 5% of power consumption was needed when the backlight worked in private narrow viewing mode to maintain the same luminance as that of a conventional backlight. (C) 2015 Optical Society of America