Browsing by Author "Lu, Jian-Gang"

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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
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Liu, Jun
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Tan, Jian
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Yang, Bo-Ru
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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.
A Pressure-Sensitive Impedance-Type Touch Panel With High Sensitivity and Water-Resistance
(2018-07-01)
Liu, Shi-Yu
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Pan, Jin
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Lu, Jian-Gang
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Shieh, Han-Ping D.
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顯示科技研究所
A pressure-sensitive impedance-type touch panel which detects impedance of sensors to identify touch position and applied pressure is demonstrated. It shows high pressure sensitivity in the low pressure regime, high water-resistance, low hysteresis, and high durability, and enables multilevel pressure detection. Because impedance-type sensors act as touch sensors as well as pressure sensors, fabrication process and device architecture can be simplified. Two substrates of the touch panel are bonded together without spacers or bezel tapes in between, improving the uniformity of compressive strain in current pressure-sensitive touch panels. The touch solution offers a new measurement mechanism for sensors involving non-conductive to conductive transition and has great potential for application in wearable interactive devices.
Blue Phase LC/Polymer Fresnel Lens Fabricated by Holographics
(2014-02-01)
Tan, Jian
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Song, Yue
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Zhu, Ji-Liang
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Ni, Shui-Bin
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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.
Chiral-induced self-assembly sphere phase liquid crystal with fast switching time
(2014-03-03)
Zhu, Ji-Liang
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Ni, Shui-Bin
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Chen, Chao Ping
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Wu, Dong-Qing
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Song, Xiao-Long
A fluid self-assembly sphere phase (SP) of liquid crystal induced by chiral dopant is observed in a narrow temperature range between isotropic and blue phase or between isotropic and chiral nematic phase. The SP consists of three-dimensional twist spheres (3-DTSs) and disclinations among 3-DTSs. The temperature range of the SP has been broadened to more than 85 degrees C by stabilizing the disclinations with amorphous polymer chains. The electro-optical switching time of the polymer-stabilized SP is demonstrated in sub-millisecond with a low switching electric field of 4.4 V mu m(-1), which is of promising applications in displays, 3-D tunable photonic crystals, and phase modulators. (C) 2014 AIP Publishing LLC.
Efficiency Enhancement of Organic Light-Emitting Diodes on Flexible Substrate With Patterned Inverted Conical Structure
(2016-02-01)
Wang, Yi-Jun
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Lu, Jian-Gang
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Shieh, Han-Ping D.
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光電工程學系
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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
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Chao, Wei-Chung
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Lu, Jian-Gang
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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
Highly Sensitive and Optically Transparent Resistive Pressure Sensors Based on a Graphene/Polyaniline-Embedded PVB Film
(2018-05-01)
Liu, Shi-Yu
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Lian, Lu
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Pan, Jin
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Lu, Jian-Gang
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Shieh, Han-Ping D.
The development of a facile, low-temperature, and low-cost method to fabricate highly sensitive and optically transparent resistive pressure sensors remains a challenge. In this paper, a graphene/polyaniline-embedded polyvinyl butyral (GPANI-PVB) composite film is employed as the active layer in a resistive pressure sensor; this film is ultrathin, highly sensitive, optically transparent, anisotropically conductive, highly durable, highly flexible, and bending insensitive. A flexible touch panel based on the GPANI-PVB composite film is fabricated using a facile process, which supports multitouch and multilevel pressure detection. The GPANI-PVB composite film offers great potential for applications in flexible and transparent interactive electronic devices.
Hybrid Effect of Crossed Alignment and Multi-Stacking Structure on the Percolation Behavior of Silver Nanowire Networks
(2015-07-01)
Yang, Bo-Ru
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Liu, Gui-Shi
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Han, Song-Jia
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Cao, Wu
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Chen, Hui-Jiuan
Owing to the superiority of being flexible, highly conductive, and extremely transparent, silver nanowire (AgNW) has been regarded as a possible candidate to replace indium-tin-oxide (ITO) for flexible transparent conductive films (TCFs), flexible electronics, and flexible display applications. To make TCFs with lower sheet resistance (R-s), but without sacrificing the optical transmittance, the deployment of AgNWs is very critical. A crossed-alignment method along with multi-stacking structure was proposed to lower the percolative threshold, which thus can decrease the R-s by a factor of more than two, in the premise of not affecting the optical transmittance.
Influence of Permittivity on the Sensitivity of Porous Elastomer-Based Capacitive Pressure Sensors
(2018-03-01)
Liu, Shi-Yu
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Lu, Jian-Gang
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Shieh, Han-Ping D.
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顯示科技研究所
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Institute of Display
Porous elastomer has been used as the dielectric layer of capacitive pressure sensors to reduce the Young's modulus and improve the sensitivity. In this paper, influence of permittivity on the sensitivity of porous elastomer-based capacitive pressure sensors is investigated. By introducing metallic particles (silver nanoparticles) into porous elastomer (polydimethylsiloxane) to increase its permittivity, the sensitivity of the porous composite-based capacitive pressure sensor is improved by 101.5% in the low-to-medium pressure regime (0-100 kPa). The capacitive pressure sensor also shows high linearity, good durability, and high noise immunity. Due to its high sensitivity, an artificial hand based on the capacitive pressure sensor can detect tiny pressure changes induced by wrist pulse and derive pressure distribution on different phalanges.
Light extraction from electroluminescent devices using micro-rod array embedded within glass substrate
(2015-07-27)
Wang, Yi-Jun
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Ouyang, Shi-Hong
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Lu, Jian-Gang
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Shieh, Han-Ping D.
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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
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Li, Wei-Huan
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Wang, Yi-Jun
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Lu, Jian-Gang
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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
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Lu, Jian-Gang
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Chao, Wei-Chung
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Shieh, Han-Ping D.
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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