• Title/Summary/Keyword: Reflective liquid crystal display

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Black-white Reflective Liquid Crystal Display Prepared with Two Color Reflective Layers

  • Choi, Woon-Seop;Kim, Min-Kyu
    • Transactions on Electrical and Electronic Materials
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    • v.10 no.1
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    • pp.20-23
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    • 2009
  • Black-white reflective cholesteric liquid crystal display was prepared with two color liquid crystal layers, the combination of yellow color liquid crystal and blue color liquid crystal. The rubbing of cholesteric liquid crystal panel affects the brightness and color spectrum due to increase the planar domain texture. The CIE chromaticity coordinate of white is (0.31, 0.31).

Blue-white Reflective Cholesteric Liquid Crystal Displays by Single Liquid Crystal Layer

  • Choi, Woon-Seop;Lee, Hee-Jeong
    • Transactions on Electrical and Electronic Materials
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    • v.9 no.6
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    • pp.251-254
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    • 2008
  • Blue-white reflective cholesteric liquid crystal display was prepared by a unique method of single liquid crystal layer, the combination of yellow color liquid crystal and blue color backplane. The dopant and host combination of chlolesteric liquid crystal affects the color spectrum. The CIE chromaticity coordinates of blue and white are (0.10, 0.16) and (0.29, 0.30), respectively. The relatively low driving voltages of 32 V for blue-white display are obtained.

Bragg Reflective Polymer Stabilized Cholesteric Liquid Crystal Display

  • Kwon, Jang-Un;Kang, Dae-Seung
    • Journal of Information Display
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    • v.4 no.3
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    • pp.26-28
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    • 2003
  • In the paper, we investigated the Bragg reflective cholesteric display based on polymer stabilization. We studied the bistability in the polymer stabilized cholesteric texture (PSCT) films and baused on which we achieved wider viewing angle though imperfect planar texture.

Wavelength Divided Trans-reflective Liquid crystal Displays

  • Yang, D.K.;Zhou, F.
    • 한국정보디스플레이학회:학술대회논문집
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    • 2003.07a
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    • pp.309-310
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    • 2003
  • We have designed novel transreflective liquid crystal displays which utilize dielectric mirrors. The reflective and transmissive modes are operated in different wavelength regions. The displays have the advantages: (1) the brightness as a function of applied voltage is the same for both modes, (2) the backlight and ambient light are utilized efficiently.

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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.

A High Quality Fringe-Field Switching Display for Transmissive and Reflective Types

  • Lee, Seung-Hee;Hong, Seung-Ho;Jeong, Yeon-Hak;Kim, Hyang-Yul
    • Journal of Information Display
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    • v.1 no.1
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    • pp.9-13
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    • 2000
  • In liquid crystal displays, the display mode that represents initial liquid crystal alignment and method of applying voltage, mainly determines the image quality of display. Recently we have developed the fringe-field switching (FFS) mode exhibiting high image quality. In this paper, a pixel concept, manufacturing process, materials, and electro-optic characteristics of the FFS mode comparing with conventional in-plane switching mode, and its possible application to reflective type are discussed.

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Electro-optic Characteristics of the fringe-field Driven-reflective Liquid Crystal Display with One Polarizer (1매의 편광판으로 구성된 반사형 Fringe-field Switching Mode의 전기 광학 특성)

  • 정태봉;박지혁;이종문;김용배;이승희
    • Journal of the Korean Institute of Electrical and Electronic Material Engineers
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    • v.16 no.2
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    • pp.131-137
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    • 2003
  • We have performed computer simulation to obtain electro-optic chracteristics of reflective liquid crystal display (LCD) using wide viewing angle LC mode, fringe field switching(FFS). Unlike other reflective LCD modes, in the FFS mode, the LC director in plance so an application to reflective display consisted of polarizer, LC layer and reflector is possible. when an incident light is 550mm, the optimal cell retardation value is 0.1365${\mu}$m and the efficiency of reflectivity is high over 90% with very little wavelength dispersion. Further, we have studied a new reflective display with polarizer, optical compensation film with half plate, LC plus reflector. The display with optimized cell parameters shows high contrast ratio (CR) over 130 with high light efficiency over 90% at normal direction and the CR greater than 5 exists over 60$^{\circ}$ of polar angle in all directions.

Simulation for Electro-Optic Characteristics of the Fringe-Field Driven Reflective Hybrid Aligned Nematic Liquid Crystal Display with One Polarizer (1매의 편광판으로 구성된 Fringe-Field 구동형 반사형 Hybrid Aligned Nematic 액정디스플레이의 전기-광학 특성에 관한 시뮬레이션)

  • 박지혁;정태봉;이종문;김용배;이승희
    • Journal of the Korean Institute of Electrical and Electronic Material Engineers
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    • v.16 no.10
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    • pp.908-913
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    • 2003
  • We have performed computer simulation to obtain electro-optic characteristics of reflective hybrid aligned nematic liquid crystal displays (LCDs) driven by fringe field. The results show that the optimal retardation value (dΔn) of the cell is 0.289 ${\mu}$m, which allows for the cell to have a practical cell gap of larger than 3 ${\mu}$m when manufacturing. A reflectance of the dark state is only 0.114 % for an incident light 550 nm. At this condition, the light efficiency of white state reaches 92.7 %. The display with optimized cell parameters shows that the contrast ratio greater than 5 exists over 600 of polar angle in all directions and lower driving voltage than that of fringe-field driven homogeneously aligned reflective LCD.

A Dual-Cell-Gap Transflective Liquid Crystal Display with Identical Response Time in Transmissive and Reflective Regions

  • Zhang, Jian-De;Wang, Qiong-Hua;Li, Da-Hai;Yan, Jin-Ren
    • 한국정보디스플레이학회:학술대회논문집
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    • 2009.10a
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    • pp.87-90
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    • 2009
  • A dual-cell-gap transflective liquid crystal display (TR-LCD) with identical response time in the transmissive and reflective regions is demonstrated. In the transmissive region, strong anchoring energy condition is used to decrease the response time, while in the reflective region weak anchoring energy condition is used to increase the response time. The simulated dual-cell-gap TR-LCD has good performances.

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A New Reflective Display Mode for Antiferroelectric Liquid Crystal

  • Park, Won-Sang;Kim, Sung-Chul;Lee, Gi-Dong;Yoon, Tae-Hoon;Kim, Jae-Chang
    • Journal of Information Display
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    • v.1 no.1
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    • pp.48-51
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    • 2000
  • In this work, we proposed a reflective antiferroelectric liquid crystal display (AFLCD) using a half-wave cell whose inplane tilt angle is $22.5^{\circ}$. To check the validity of our design, we fabricated a reflective half-wave AFLC cell of which inplane tilt angle is $24.9^{\circ}$, and measured VIS reflection spectra, contrast ratio and response time. In the results, the half-wave AFLC cell in the reflective configuration exhibits high brightness, high contrast ratio of 20:1, and fast response time of $700{\mu}s$.

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