• Title/Summary/Keyword: Liquid Crystal Display (LCD)

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Fabrication of $32{\times}32$ Flat Panel Display Using Liquid Crystal (액정을 이용한 $32{\times}32$ 평판표시기의 제작)

  • 金正圭;金忠基;慶宗旻
    • Journal of the Korean Institute of Telematics and Electronics
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    • v.23 no.1
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    • pp.46-49
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    • 1986
  • A 32x32 liquid crystal (LC) flat panel display using two-dimensional array of PMOS switches and capacitors is designed and fabricated. Standard PMOS process was followed to fabricate the switch and capacitor array on silicon wafer, on the top of which guest-host effect liquid crystal was wmployed as an electro-optical material for optical switching and liquid crystal display(LCD) with its external drive circuitry was basically successful. Remaining problems to be solved are improvement of contrast ratio, good surface alignment and uniformity.

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Azo-Dyes Photo-Aligning; Physics and Applications

  • Chigrinov, V.G.;Kwok, H.S.;Takada, Hirokazu;Takatsu, Haruyoshi
    • 한국정보디스플레이학회:학술대회논문집
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    • pp.759-763
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    • 2005
  • This review presents the status of our research in liquid crystal display (LCD) photo-aligning. We present the basic mechanisms of the photo-induced order in various photo-aligning materials and in azo-dye layers in particular and show that photo-aligning methods can provide a controllable pretilt angle and anchoring energy of the liquid crystal cell, as well as its high thermo and UV stability. The photo-aligning of various types of liquid crystal displays is also discussed.

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전유기 트랜지스터용 유기 절연재

  • 이무열;손현삼;표승문;이미혜
    • Electrical & Electronic Materials
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    • v.17 no.7
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    • pp.21-29
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    • 2004
  • 절연성 기판 위에 단결정이 아닌 반도체 박막을 이용하여 만든 전계효과 (Field Effect FET) 소자로 일반적으로 정의되는 박막 트랜지스터 (Thin Film Transistor, TFT)는 1962 RCA lab.의 Weimer에 제안되어 지금까지 많은 발전을 거듭해 왔다. [1] TFT는 SRAM이나 ROM에도 응용되지만, 주된 사용 분야는 능동구동방식 평판 디스플레이(Active Matrix Flat Panel Display)의 화소 스위칭 소자이다. 액정 디스플레이(Liquid Crystal Display, LCD)나 유기 전계발광 디스플레이(Organic Electro-luminescence Display, OELD) 화소의 스위칭 소자로도 TFT가 널리 사용되고 있다. (중략)

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Transflective Liquid Crystal Display with High Aperture Ratio using Electrophoresis Particles

  • Cheong, Seung-Hwan;Bae, Kwang-Soo;Yu, Chang-Jae;Kim, Jae-Hoon
    • 한국정보디스플레이학회:학술대회논문집
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    • pp.166-168
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    • 2009
  • We proposed a transflective liquid crystal display (LCD) with high aperture ratio using an electrophoretic particle layer (EPL). The transflective LCD consisted of the stacked LC layer and EPL which was acted as a switchable mirror under in-plane electrode structure. Without separation of reflective part and transmissive part in one pixel, a modeselectable display device can be obtained.

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Electro-optical performance of TN-LCD wish oblique UV light irradiation on polyimide surface (경사진 자외선 조사를 이용한 TN-LCD의 전기광학 특성)

  • 서대식;박두석;한정민;황율연;박태규
    • Proceedings of the Korean Institute of Electrical and Electronic Material Engineers Conference
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    • pp.113-116
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    • 1998
  • In this paper, we studied the electro-optical(EO) performance of photo-aligned twisted nematic(TN)-liquid crystal display(LCD) with oblique non-polarized ultraviolet(UV) light irradiation on polyimide(Pl) surface. We observed that the voltage-transmittance and response time characteristics of photo-aligned TN-LCD is almost same compared to conventional TN-LCD. Also, we observed that the voltage-holding-ratio(VHR) of photo-aligned TN-LCD is almost same compared to conventional TN-LCD.

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Spatio-angular multiplexed optical memory system using LCD moving window and hi-focus lens (LCD Moving Window와 이중초점 렌즈를 이용한 각 .공간 다중화 광메모리 시스템)

  • 김규태;황진환;김수길;김은수
    • Proceedings of the IEEK Conference
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    • pp.921-924
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    • 1999
  • By controlling the pixels of a liquid crystal display (LCD) electronically, we fabricated a real-time moving window on a LCD, through which light passes. Using the moving window and hi-focusing lens, we suggested a non-mechanical spatio-angular multiplexed holographic memory system and demonstrated its feasibility through optical experiments. The principle of the proposed method and optical experimental results are also presented.

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Back Light Unit using a Micro-lens Fabricated by the Modified LIGA Process (LIGA 방식을 적용시킨 Microlens 적용 Back Light Unit 개발)

  • Park, Jung-Ho;Sung, Ki-Sung;Yun, Suk-Joo;Ha, Soo-Yong;Lee, Kyu-Hyun;Hwang, Chul-Jin;Jeon, Suk-Hee
    • Proceedings of the Optical Society of Korea Conference
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    • pp.70-71
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    • 2004
  • Back light unit(BLU) using a microlens fabricated by the modified LIGA process for the liquid crystal display(LCD) is proposed, and some experimental results are presented. To realize the back light unit using microlens pattern, LIGA and reflow process are used.

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Liquid Crystal Display with High and Stable Color Gamut by Using Pre-compensated Tri-chromatic LED Backlight

  • Chiu, Tien-Lung;Lee, Jiun-Haw
    • 한국정보디스플레이학회:학술대회논문집
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    • pp.1515-1518
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    • 2007
  • We demonstrate a high color gamut liquid crystal display (LCD) system (>100 %) by using a precompensated tri-chromatic LED-backlight module over a temperature range of (25 to $70^{\circ}C$), whose pre-compensated optical characteristic balances the spectral redshift and intensity decrease due to the temperature rising during operation.

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Control of Wavelength Dispersion of Birefringence by Miscible Polymer Blends

  • Ougizawa, Toshiaki;Kuboyamaima, Keiichi
    • Proceedings of the Polymer Society of Korea Conference
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    • pp.365-365
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    • 2006
  • The wavelength dispersion of birefringence (or retardation) is very important property for optical use of polymer films. Birefringence free film and retardation film have been widely used for applications such as liquid crystal display (LCD). In this study, miscible polymer blends which consist of polymers of positive and negative birefringence were found. By operating composition and orientation of molecules in the transparent blend films, the behavior of wavelength dispersion of birefringence (retardation) was controlled. The applicability to wideband birefringence free film and quarter wave (retardation) film was discussed.

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Long period application of AC field causing contrast reduction of IPS cell

  • Momoi, Yuichi;Koda, Tomonori
    • 한국정보디스플레이학회:학술대회논문집
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    • pp.870-872
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    • 2008
  • It is known that AC electric field to drive IPS mode of liquid crystal display (LCD) causes reduction of the contrast after long period of display operation. Our results are presented in this paper on a base of a model of interaction between surface of PI alignment film and LC molecules. We conclude that the surface viscosity of PI alignment film is one of the most important factors for the contrast reduction phenomenon.

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