KR970007438A - 개선된 광학 보상층을 갖춘 액정 디스플레이 - Google Patents

개선된 광학 보상층을 갖춘 액정 디스플레이 Download PDF

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KR970007438A
KR970007438A KR1019960029243A KR19960029243A KR970007438A KR 970007438 A KR970007438 A KR 970007438A KR 1019960029243 A KR1019960029243 A KR 1019960029243A KR 19960029243 A KR19960029243 A KR 19960029243A KR 970007438 A KR970007438 A KR 970007438A
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liquid crystal
crystal display
optical compensation
optical
axis
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KR1019960029243A
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KR100233187B1 (ko
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겐이찌 다까또리
마사요시 스즈끼
겐 스미요시
히데야 무라이
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가네꼬 히사시
닛뽕덴끼 가부시끼가이샤
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Priority claimed from JP8120085A external-priority patent/JPH09304764A/ja
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    • G—PHYSICS
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    • G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
    • G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
    • G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour 
    • G02F1/13—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour  based on liquid crystals, e.g. single liquid crystal display cells
    • G02F1/133—Constructional arrangements; Operation of liquid crystal cells; Circuit arrangements
    • G02F1/1333—Constructional arrangements; Manufacturing methods
    • G02F1/1337—Surface-induced orientation of the liquid crystal molecules, e.g. by alignment layers
    • G02F1/133753—Surface-induced orientation of the liquid crystal molecules, e.g. by alignment layers with different alignment orientations or pretilt angles on a same surface, e.g. for grey scale or improved viewing angle
    • G—PHYSICS
    • G02—OPTICS
    • G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
    • G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
    • G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour 
    • G02F1/13—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour  based on liquid crystals, e.g. single liquid crystal display cells
    • G02F1/133—Constructional arrangements; Operation of liquid crystal cells; Circuit arrangements
    • G02F1/1333—Constructional arrangements; Manufacturing methods
    • G02F1/1335—Structural association of cells with optical devices, e.g. polarisers or reflectors
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    • G02—OPTICS
    • G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
    • G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
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    • G02F1/13—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour  based on liquid crystals, e.g. single liquid crystal display cells
    • G02F1/133—Constructional arrangements; Operation of liquid crystal cells; Circuit arrangements
    • G02F1/1333—Constructional arrangements; Manufacturing methods
    • G02F1/1335—Structural association of cells with optical devices, e.g. polarisers or reflectors
    • G02F1/13363—Birefringent elements, e.g. for optical compensation
    • G02F1/133632—Birefringent elements, e.g. for optical compensation with refractive index ellipsoid inclined relative to the LC-layer surface
    • G—PHYSICS
    • G02—OPTICS
    • G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
    • G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
    • G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour 
    • G02F1/13—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour  based on liquid crystals, e.g. single liquid crystal display cells
    • G02F1/133—Constructional arrangements; Operation of liquid crystal cells; Circuit arrangements
    • G02F1/1333—Constructional arrangements; Manufacturing methods
    • G02F1/1335—Structural association of cells with optical devices, e.g. polarisers or reflectors
    • G02F1/13363—Birefringent elements, e.g. for optical compensation
    • G02F1/133634—Birefringent elements, e.g. for optical compensation the refractive index Nz perpendicular to the element surface being different from in-plane refractive indices Nx and Ny, e.g. biaxial or with normal optical axis
    • G—PHYSICS
    • G02—OPTICS
    • G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
    • G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
    • G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour 
    • G02F1/13—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour  based on liquid crystals, e.g. single liquid crystal display cells
    • G02F1/133—Constructional arrangements; Operation of liquid crystal cells; Circuit arrangements
    • G02F1/1333—Constructional arrangements; Manufacturing methods
    • G02F1/1335—Structural association of cells with optical devices, e.g. polarisers or reflectors
    • G02F1/13363—Birefringent elements, e.g. for optical compensation
    • G—PHYSICS
    • G02—OPTICS
    • G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
    • G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
    • G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour 
    • G02F1/13—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour  based on liquid crystals, e.g. single liquid crystal display cells
    • G02F1/133—Constructional arrangements; Operation of liquid crystal cells; Circuit arrangements
    • G02F1/1333—Constructional arrangements; Manufacturing methods
    • G02F1/1337—Surface-induced orientation of the liquid crystal molecules, e.g. by alignment layers
    • G02F1/133753—Surface-induced orientation of the liquid crystal molecules, e.g. by alignment layers with different alignment orientations or pretilt angles on a same surface, e.g. for grey scale or improved viewing angle
    • G02F1/133757—Surface-induced orientation of the liquid crystal molecules, e.g. by alignment layers with different alignment orientations or pretilt angles on a same surface, e.g. for grey scale or improved viewing angle with different alignment orientations
    • G—PHYSICS
    • G02—OPTICS
    • G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
    • G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
    • G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour 
    • G02F1/13—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour  based on liquid crystals, e.g. single liquid crystal display cells
    • G02F1/133—Constructional arrangements; Operation of liquid crystal cells; Circuit arrangements
    • G02F1/1333—Constructional arrangements; Manufacturing methods
    • G02F1/1337—Surface-induced orientation of the liquid crystal molecules, e.g. by alignment layers
    • G02F1/133753—Surface-induced orientation of the liquid crystal molecules, e.g. by alignment layers with different alignment orientations or pretilt angles on a same surface, e.g. for grey scale or improved viewing angle
    • G02F1/133761—Surface-induced orientation of the liquid crystal molecules, e.g. by alignment layers with different alignment orientations or pretilt angles on a same surface, e.g. for grey scale or improved viewing angle with different pretilt angles
    • G—PHYSICS
    • G02—OPTICS
    • G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
    • G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
    • G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour 
    • G02F1/13—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour  based on liquid crystals, e.g. single liquid crystal display cells
    • G02F1/133—Constructional arrangements; Operation of liquid crystal cells; Circuit arrangements
    • G02F1/1333—Constructional arrangements; Manufacturing methods
    • G02F1/1343—Electrodes
    • G02F1/134309—Electrodes characterised by their geometrical arrangement
    • G02F1/134345—Subdivided pixels, e.g. for grey scale or redundancy
    • G—PHYSICS
    • G02—OPTICS
    • G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
    • G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
    • G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour 
    • G02F1/13—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour  based on liquid crystals, e.g. single liquid crystal display cells
    • G02F1/137—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour  based on liquid crystals, e.g. single liquid crystal display cells characterised by the electro-optical or magneto-optical effect, e.g. field-induced phase transition, orientation effect, guest-host interaction or dynamic scattering
    • G02F1/139—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour  based on liquid crystals, e.g. single liquid crystal display cells characterised by the electro-optical or magneto-optical effect, e.g. field-induced phase transition, orientation effect, guest-host interaction or dynamic scattering based on orientation effects in which the liquid crystal remains transparent
    • G02F1/1396—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour  based on liquid crystals, e.g. single liquid crystal display cells characterised by the electro-optical or magneto-optical effect, e.g. field-induced phase transition, orientation effect, guest-host interaction or dynamic scattering based on orientation effects in which the liquid crystal remains transparent the liquid crystal being selectively controlled between a twisted state and a non-twisted state, e.g. TN-LC cell
    • G—PHYSICS
    • G02—OPTICS
    • G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
    • G02F2413/00—Indexing scheme related to G02F1/13363, i.e. to birefringent elements, e.g. for optical compensation, characterised by the number, position, orientation or value of the compensation plates
    • G02F2413/10—Indexing scheme related to G02F1/13363, i.e. to birefringent elements, e.g. for optical compensation, characterised by the number, position, orientation or value of the compensation plates with refractive index ellipsoid inclined, or tilted, relative to the LC-layer surface O plate
    • G02F2413/105—Indexing scheme related to G02F1/13363, i.e. to birefringent elements, e.g. for optical compensation, characterised by the number, position, orientation or value of the compensation plates with refractive index ellipsoid inclined, or tilted, relative to the LC-layer surface O plate with varying inclination in thickness direction, e.g. hybrid oriented discotic LC

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Abstract

액정 디스플레이는 복수개의 상부 및 하부 픽셀쌍을 가지며, 이들 각각은 상이한 전압이 인가되는 복수개의 서브 영역을 가지며, 상기 및 하부 픽셀중의 하나 이상은 광학적으로 네거티브인 단일축 구조의 광학 보상층을 가진다. 또다른 액정 디스플레이는 액정 분자의 트위스트 방향과 틸트 업 방향이 서로 다르면서 상호 존재하는 상이한 영역을 갖는 액정층과, 액정층과 편광판사이에 양축 이방성 굴절율을 갖는 하나 이상의 광학 보상층을 포함하며, 상기 광학 보상층의 양축 이방성 굴절율은 nx〉ny〉nz의 관계를 충족시키는 3개의 서로 다른 굴절율 nx, ny〉nz를 가지며, nx는 상기 광학 보상층 표면에 평행한 X축과 평행한 방향의 굴절율이며, ny는 상기 광학 보상층 표면에 평행한 Y축에 평행하며 상기 X축과 수직한 방향의 굴절율이며, nz는 상기 광학 보상층의 표면에 수직한 Z축과 평행한 방향의 굴절율이다.

Description

개선된 광학 보상층을 갖춘 액정 디스플레이
본 내용은 요부공개 건이므로 전문내용을 수록하지 않았음
제8도는 본 발명에 의한 개선된 TN 액정 디스플레이에 있어서, 광학 보상층과 TN 액정 분자의 회전에 대한 시야각을 나타내는 도, 제9도는 본 발명에 의한 개선된 TN 액정 디스플레이에 있어서, 광학 보상층과 TN 액정 분자간의 회전 관계를 나타내는 도.

Claims (15)

  1. 상부 및 하부 픽셀쌍을 복수개 갖는 액정 디스플레이에 있어서, 상기 각 픽셀은 상이한 전압이 인가되는 복수개의 서브 영역을 가지는 것을 특징으로 하는 액정 디스플레이.
  2. 제1항에 있어서, 상기 액정 디스플레이는 TN 액정을 사용하는 것을 특징으로 하는 액정 디스플레이.
  3. 제1항에 있어서, 상기 각 픽셀은 커패시티가 서로 다른 서브 영역으로 나누어지는 것을 특징으로 하는 액정 디스플레이.
  4. 제1항에 있어서, 광학 보상층의 광학적 네거티브 축은 상기 광학 보상층 표면의 법선축에 대하여 기울어진 것을 특징으로 하는 액정 디스플레이.
  5. 제4항에 있어서, 광학 보상층의 광학적 네거티브 축은 상기 광학 보상층 표면의 법선축에 대하여 균일하게 기울어진 것을 특징으로 하는 액정 디스플레이.
  6. 제4항에 있어서, 상기 광학 보상층 표면의 법선축에 대하여 균일하게 기울어진 2개의 상기 광학 보상층은 각각의 광학축 방향이 액정에 전압이 인가된 경우의 액정 방향자의 방향과 거의 대응하도록 상부 기판 위에 제공되는 것을 특징으로 하는 액정 디스플레이.
  7. 제4항에 있어서, 상기 광학 보상층 표면의 법선축에 대하여 균일하게 기울어진 2개의 상기 광학 보상층은 각각의 광학축 방향이 액정에 전압이 인가된 경우의 액정 방향자의 방향과 거의 대응하도록 하부 기판 아래에 제공되는 것을 특징으로 하는 액정 디스플레이.
  8. 제4항에 있어서, 상기 광학 보상층 표면의 법선축에 대하여 균일하게 기울어진 2개의 상기 광학 보상층은 각각의 광학축 방향이 액정에 전압이 인가된 경우의 액정 방향자의 방향과 거의 대응하도록 상부 기판 위와 하부 기판 아래에 제공되는 것을 특징으로 하는 액정 디스플레이.
  9. 제4항에 있어서, 상기 광학 보상층 표면의 법선축에 대하여 균일하게 기울어진 2개의 상기 광학 보상층은 광학축의 평균 방향이 액정에 전압이 인가된 경우의 액정 방향자의 방향과 거의 대응하도록 상부 기판 위에 제공되는 것을 특징으로 하는 액정 디스플레이.
  10. 제4항에 있어서, 상기 광학 보상층 표면의 법선축에 대하여 균일하게 기울어진 2개의 상기 광학 보상층은 광학축의 평균 방향이 액정에 전압이 인가된 경우의 액정 방향자의 방향과 거의 대응하도록 하부 기판 아래에 제공되는 것을 특징으로 하는 액정 디스플레이.
  11. 제4항에 있어서, 상기 광학 보상층 표면의 법선축에 대하여 균일하게 기울어진 2개의 상기 광학 보상층은 광학축의 평균 방향이 액정에 전압이 인가된 경우의 액정 방향자의 방향과 거의 대응하도록 상부 기판 위와 하부 기판 아래에 제공되는 것을 특징으로 하는 액정 디스플레이.
  12. 액정 분자의 트위스트 방향과 틸트 업 방향이 서로 다르면서 상호 존재하는 상이한 영역을 갖는 액정층과, 액정층과 편광판사이에 양축 이방성 굴절율을 갖는 하나 이상의 광학 보상층을 포함하며, 상기 광학 보상층의 양축 이방성 굴절율은 nx〉ny〉nz의 관계를 충족시키는 3개의 서로 다른 굴절율 nx, ny〉nz를 가지며, nx는 상기 광학 보상층 표면에 평행한 X축과 평행한 방향의 굴절율이며, ny는 상기 광학 보상층 표면에 평행한 Y축에 평행하며 상기 X축과 수직한 방향의 굴절율이며, nz는 상기 광학 보상층의 표면에 수직한 Z축과 평행한 방향의 굴절율인 것을 특징으로 하는 액정 디스플레이.
  13. 제12항에 있어서, 상기 액정 디스플레이는 액정 분자의 트위스트 방향과 틸트 업 방향이 서로 다르게 상호 존재하는 4개의 상이한 영역을 가짐을 특징으로 하는 액정 디스플레이.
  14. 제12항에 있어서, 상호 평행하며 각 면이 상호 마주대하는 투명 기판이 제공되었으며, 러빙 방향이 90도만큼 서로 다른 방향막과 투명 전극이 제공된 것을 특징으로 하는 액정 디스플레이.
  15. 제12항에 있어서, 액정층의 상부 및 하부 표면상에 제공된 상부 및 하부 방향막과, 상기 상부 방향막상에 제공된 상부 투명 전극과, 상기 하부 방향막(21)상에 제공된 하부 투명 전극과, 상기 상부 투명 전극상에 제공된 상부 유리 기판과, 상기 상부 유리 기판으로부터 소정 갭만큼 떨어져 상기 상부 유리 기판 위에 제공된 상부 편광판과, 상기 하부 유리 기판으로부터 소정 갭만큼 떨어져 상기 하부 유리 기판 아래에 제공된 광학 보상층과, 상기 광학 보상층으로부터 소정 갭만큼 떨어져 상기 광학 보상층 아래에 제공된 하부 편광판을 구비하는 것을 특징으로 하는 액정 디스플레이.
    ※ 참고사항 : 최초출원 내용에 의하여 공개하는 것임.
KR1019960029243A 1995-07-14 1996-07-15 개선된 광학 보상층을 갖춘 액정 디스플레이 KR100233187B1 (ko)

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