• Title/Summary/Keyword: aperture ratio

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A High Aperture Ratio TFT Design for Bottom Emission Type AMOLED

  • Chien, Yao Hong;Huang, Jack
    • 한국정보디스플레이학회:학술대회논문집
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    • pp.711-714
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    • 2004
  • A new design for improving the aperture ratio of bottom emission type AMOLED is investigated. In conventional, the TFT of AMOLED fabrication method is "Etch Stopper (7-mask)", so the aperture ratio is limited in 28${\sim}$33% by Cs(Storage Capacitor). A high aperture ratio TFT is designed by using BCE(Back Channel Etching 5-mask) fabrication way and the aperture ratio is up to 40% shown in 2.2"AMOLED display.

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Study about aperture ratio of projection-type integral imaging system (투사형 집적 영상 시스템의 개구율에 관한 연구)

  • Min, Seong-Uk
    • Proceedings of the Optical Society of Korea Conference
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    • pp.81-82
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    • 2008
  • The projection-type integral imaging system using mirror array is studied at the viewpoint of the aperture ratio of system. The aperture ratio which is determined by the relation of the specifications of the projection lens and the elemental mirrors affects the viewing quality of integral imaging system. This factors play an important role in the system design.

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Single Isolation Structure of High Aperture Ratio for a PMOLED

  • Youn, Suk-Won;Byun, Byung-Hyun;Choi, Kyung-Hee;Yi, Seung-Jun;Choi, Do-Hyun
    • 한국정보디스플레이학회:학술대회논문집
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    • pp.1028-1029
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    • 2006
  • We have developed a self-aligned single isolation structure (SIS) and an asymmetric single isolation structure with an image reversal photoresist to increase the aperture ratio in a passive matrix organic light emitting display (PMOLED). Compared to the conventional structure, the fabrication process is reduced by about 17% and the aperture ratio is enlarged over 4%.

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Design of Low Power LTPS AMOLED Panel and Pixel Compensation Circuit with High Aperture Ratio (고 개구율 화소보상회로를 갖는 저전력 LTPS AMOLED 패널 설계)

  • Kang, Hong-Seok;Woo, Doo-Hyung
    • Journal of the Institute of Electronics Engineers of Korea SD
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    • v.47 no.10
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    • pp.34-41
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    • 2010
  • We proposed the new pixel compensation circuit with high aperture ratio and the driving method for the large-area, low-power AMOLED applications in this study. We designed with the low-temperature poly-silicon(LTPS) thin film transistors(TFTs) that has poor uniformity but good mobility and stability. To lower the error rate of the pixel circuit and to improve the aperture ratio for bottom emission method, we simplified the pixel compensation circuit. Because the proposed pixel compensation circuit with high aperture ratio has very low contrast ratio for conventional driving methods, we proposed the new driving method and circuit for high contrast ratio. Black data insertion was introduced to improve the characteristics for moving images. The pixel circuit was designed for 19.6" WXGA bottom-emission AMOLED panel, and the average aperture ratio of the pixel circuit is improved from 33.0% to 41.9%. For the TFT's $V_{TH}$ variation of ${\pm}0.2\;V$, the non-uniformity and contrast ratio of the designed panel was estimated under 6% and over 100000:1 respectively.

Development of High Aperture Ratio 2.1” QVGA LTPS (Low Temperature Poly Si) LCD Using SLS (Sequential Lateral Solidification) Technology

  • Kang, Myung-Koo;Lee, Joong-Sun;Park, Jong-Hwa;Zhang, Lintao;Joo, Seung-Yong;Kim, Chul-Ho;Kim, Il-Kon;Kim, Sung-Ho;Park, Kyung-Soon;Yoo, Chun-Ki;Kim, Chi-Woo
    • 한국정보디스플레이학회:학술대회논문집
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    • pp.1033-1034
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    • 2005
  • High resolution 2.1” QVGA LTPS LCD (190ppi) having high aperture ratio of 65% could be successfully developed using state-of-the-art SLS technology and active/gate storage structure. Cost effective P-MOS 6-Mask structure was used. Full gate and transmission gate circuits are integrated in the panel. The high aperture ratio was obtained by using active/gate capacitance structure, which can reduce storage capacitance area. The aperture ratio was increased to 65% from 49% of conventional gate/data capacitance structure. The brightness was increased from 180cd to 270cd without any degradation of optical properties such as contrast ratio, flicker or crosstalk.

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A Novel Structure with Improved Optical Characteristics in FFS Mode LCD

  • Kim, Dae-Woo;Jung, Moo-Sung;Won, Tae-Young;Yoon, Hyung-Jin;Lee, Cheol-Su;Yoon, Suk-In;Yoon, Sang-Ho
    • 한국정보디스플레이학회:학술대회논문집
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    • pp.439-442
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    • 2005
  • In this paper, we propose a cell structure to improve transmittance and aperture ratio with FFS(Fringe Field Switching) mode. As an exemplary cell, we selected conventional FFS cell with dual domain. Optical transmittance and aperture ratio were calculated with 3DFEM numerical solver, TechWiz LCD. The simulation results revealed that transmission increases by more than 10% while aperture ratio increases by more than 4% when compared to conventional FFS mode.

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Optimization of H-IPS Structure for High Aperture Ratio.

  • Lee, Do-Young;Kim, Do-Sung;Kang, Byung-Goo;Kim, Eui-Tae;Kim, Bo-Ram;Kim, Jung-Han;Lim, Byung-Ho;Ahn, Byung-Chul
    • 한국정보디스플레이학회:학술대회논문집
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    • pp.290-293
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    • 2006
  • We designed the H-IPS that has similar aperture ratio to the AS-IPS with organic insulator. To improve the aperture ratio without organic insulator, we positioned the pixel electrode over the preceding gate on the base of the H-IPS structure, and minimized the width of pixel and common electrodes. Without the additional process, we could obtain the similar brightness with that of AS-IPS in 15inch SXGA+ Panel.

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Study on Viewing angle controllable Liquid Crystal Display with High Aperture Ratio (시야각 조절이 가능한 고개구율 액정 디스플레이 연구)

  • Shin, Suck-Jae;Her, Jung-Hwa;Lim, Young-Jin;Lee, Seung-Hee
    • Proceedings of the Korean Institute of Electrical and Electronic Material Engineers Conference
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    • pp.173-173
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    • 2010
  • We proposed viewing angle switchable liquid crystal display(LCD) associated with fringe-field switching (FFS) mode with high aperture ratio characteristic. In the device, single pixel is separated into two regions, named as main pixel for displaying images and sub pixel for viewing angle control. In sub pixel region, add the common electrode on the top substrate and the initial alignment of liquid crystal is Hybrid Alignment Nematic (HAN) state. In conclusion, we suggested that the device has high aperture ratio characteristic because the LC directors are rotated in which viewing angle control region are generated fringe electric field.

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Threshold voltage influence reduction and Wide Aperture ratio in Active Matrix Orgnic Light Emitting Diode Display (AMOLED(active matrix organic light emitting diode) 의 문턱전압 보상과 화소구조에 대한 연구)

  • 김정민;곽계달;신흥재;최성욱
    • Proceedings of the IEEK Conference
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    • pp.257-260
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    • 2002
  • This paper describes the pixel of AMOLED(act ive matrix organic light emitting diode) driving circuit by poly-sl technology. The area per pixel is 278um$\times$278um in 120$\times$160(2.2 inch) Driving the OLEDS with active matrix leads to the lower voltage operation, the lower peak pixel currents and the display with much greater efficiency and brightness The role of the active matrix is to provide a constant current throughout the entire frame time and is eliminating the high currents encountered In the passive matrix approach, This design can support the high resolutions expected by the consumer because the current variation specification is norestricted. The pixel has been designed driving TFT threshold voltage cancellation circuit and wide aperture ratio circuit that communizes 4 pixel. The test simulation results and layout are 11% per threshold-current var Eat ion and 12.5% the aperture ratio of increase.

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Transflective Liquid Crystal Display with a High Aperture Ratio using Electrophoretic Particles for a Switchable Mirror

  • Bae, Kwang-Soo;Kim, Young-Wook;Choi, Gwang-Hei;Heo, Jeong-Uk;Yu, Chang-Jae;Kim, Jae-Hoon
    • Journal of Information Display
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    • v.11 no.3
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    • pp.119-122
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    • 2010
  • This paper proposes a transflective liquid crystal display (LCD) in a whole-pixel switchable configuration with a high aperture ratio using an electrophoretic particle layer (EPL). The switchable transflective LCD consisted of the liquid crystal layer as a display unit, and the EPL as a switchable mirror. The switching of the EPL between the mirror for the reflective mode and the transparency for the transmissive mode was performed by controlling electrophoretic nanoparticles with an applied voltage in a three-electrode structure. The single pixel was used as the whole transmissive or reflective mode that corresponded to the switchable EPL mirror. Thus, a transflective LCD with a high aperture ratio was obtained.