KR100502812B1 - Wide viewing angle liquid crystal display device using retardation compensation film - Google Patents

Wide viewing angle liquid crystal display device using retardation compensation film Download PDF

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KR100502812B1
KR100502812B1 KR1019980008245A KR19980008245A KR100502812B1 KR 100502812 B1 KR100502812 B1 KR 100502812B1 KR 1019980008245 A KR1019980008245 A KR 1019980008245A KR 19980008245 A KR19980008245 A KR 19980008245A KR 100502812 B1 KR100502812 B1 KR 100502812B1
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liquid crystal
molecules
substrate
crystal display
compensation film
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KR19990074568A (en
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문중현
박승범
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삼성전자주식회사
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    • 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
    • G02F1/133632—Birefringent elements, e.g. for optical compensation with refractive index ellipsoid inclined relative to the LC-layer surface
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B5/00—Optical elements other than lenses
    • G02B5/30—Polarising elements
    • G02B5/3083—Birefringent or phase retarding elements
    • 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
    • G02F1/1335—Structural association of cells with optical devices, e.g. polarisers or reflectors
    • G02F1/13363—Birefringent elements, e.g. for optical compensation
    • G02F1/133636—Birefringent elements, e.g. for optical compensation with twisted orientation, e.g. comprising helically oriented LC-molecules or a plurality of twisted birefringent sublayers
    • 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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  • Physics & Mathematics (AREA)
  • Nonlinear Science (AREA)
  • General Physics & Mathematics (AREA)
  • Optics & Photonics (AREA)
  • Mathematical Physics (AREA)
  • Chemical & Material Sciences (AREA)
  • Crystallography & Structural Chemistry (AREA)
  • Spectroscopy & Molecular Physics (AREA)
  • Liquid Crystal (AREA)
  • Polarising Elements (AREA)

Abstract

원반 모양(discotic)을 가지며 일축성 광학 이방체의 분자가 분자의 광축이 액정 표시 장치의 기판의 법선에 대해 순차적으로 점점 작은 각도를 갖도록(hybrid) 배열한 위상차 보상막이 액정 패널의 두 기판 안쪽 면에 각각 형성되어 있다. 이러한 위상차 보상막은 액정층의 액정 분자에 의한 빛의 지연(retardation)을 보상한다. 이렇게 위상차 보상막이 두 기판의 안쪽 면에 형성되어 있으므로 액정 패널 전체의 두께는 위상차 보상 필름을 기판의 바깥 면에 부착하는 경우보다 두께가 감소하며, 가격도 저렴하게 할 수 있다. A phase difference compensating film is discotic and arranged so that the molecules of the uniaxial optically anisotropic body are hybridized such that the optical axis of the molecules is gradually smaller and smaller with respect to the normal of the substrate of the liquid crystal display device. Each is formed. This retardation compensation film compensates for the retardation of light by the liquid crystal molecules of the liquid crystal layer. Since the retardation compensation film is formed on the inner surfaces of the two substrates, the thickness of the entire liquid crystal panel is reduced compared to the case where the retardation compensation film is attached to the outer surface of the substrate, and the cost can be reduced.

Description

위상차 보상막을 이용한 광시야각 액정 표시 장치Wide viewing angle liquid crystal display device using retardation compensation film

본 발명은 광시야각 액정 표시 장치에 관한 것이다.The present invention relates to a wide viewing angle liquid crystal display device.

일반적으로 액정 표시 장치는 전극이 형성되어 있는 두 장의 기판 사이에 액정을 주입하고, 여기에 가하는 전장의 세기를 조절하여 광 투과량을 조절하는 구조로 되어 있다. In general, a liquid crystal display device has a structure in which a liquid crystal is injected between two substrates on which electrodes are formed, and the amount of light transmitted is controlled by adjusting the intensity of the electric field applied thereto.

비틀린 네마틱(twisted-nematic : TN) 방식의 액정 표시 장치는, 전압을 인가하지 않은 상태에서는 두 기판 사이에 채워진 액정 분자의 장축이 기판에 평행하며 일정한 피치(pitch)를 가지고 나선상으로 꼬여 액정 분자의 장축의 방향이 연속적으로 변화되는 비틀린 구조를 가지며, 전압이 인가되면 액정 분자들은 기판에 대해 수직으로 일어서게 된다. Twisted-nematic (TN) type liquid crystal display devices have a long axis of liquid crystal molecules filled between two substrates in a state in which no voltage is applied, and the liquid crystal molecules are twisted in a spiral with a constant pitch. It has a twisted structure in which the direction of its major axis changes continuously, and when voltage is applied, the liquid crystal molecules rise perpendicular to the substrate.

액정 물질은 분자의 장축 방향과 단축 방향으로의 굴절률이 서로 다른 복굴절성을 갖는데, 이 복굴절성에 의해 액정 표시 장치를 보는 위치에 따라 빛이 느끼는 굴절률이 차이가 생긴다. 따라서, 선편광된 빛이 액정을 통과하면서 편광 상태가 바뀌는 비율에 차이가 생겨 정면에서 벗어난 위치에서 볼 때의 빛의 양과 색특성이 정면에서 볼 경우와는 달라진다. 이로 인하여 비틀린 네마틱 구조를 갖는 액정 표시 장치는 시야각에 따라 대비비(contrast ratio)의 변화, 색상 변이(color shift), 계조 반전(gray inversion) 등의 현상이 발생한다. The liquid crystal material has birefringence in which the refractive indices in the major and minor directions of the molecules are different from each other. The birefringence causes a difference in the refractive index felt by light depending on the position of the liquid crystal display. Therefore, a difference occurs in the rate at which the polarized light is changed while the linearly polarized light passes through the liquid crystal, and thus the amount and color characteristics of the light when viewed from the front side are different from those seen from the front. As a result, a liquid crystal display having a twisted nematic structure may cause changes in contrast ratio, color shift, gray inversion, and the like depending on the viewing angle.

이와 같이 액정 셀에서 생기는 굴절율의 차이를 보상해 주기 위하여 화소 분활 배향법, 낮은 Δn의 액정을 사용하는 방법, 새로운 구동 방식을 적용하는 방법 또는 위상차 필름을 사용하는 방법 등이 있다.Thus, in order to compensate the difference in refractive index generated in the liquid crystal cell and a method of using the pixel division alignment method, a method of using a liquid crystal of a low Δ n, the method for applying a new drive system or the phase difference film or the like.

이중에서 위상차 필름을 사용하는 방법은 기존에 생산하던 비틀린 네마틱 방식을 적용하던 액정 패널을 그대로 사용하며 추가적인 설비 투자가 불필요하므로 가장 유리하게 사용되고 있는 방법이다.Among them, the method of using retardation film is the most advantageous method because it uses the liquid crystal panel which applied the conventional twisted nematic method as it is and does not need additional facility investment.

그러나, 이러한 위상차 필름을 제조하기 위해서는 지지체를 사용하므로, 위상차 필름을 액정 패널에 부착하는 경우에 전체 패널의 두께가 증가하게 된다. 또한, 위상차 필름의 가격이 비싸기 때문에 전체 패널의 가격 경쟁력을 약화시키는 문제점을 가지고 있다.However, since a support body is used to manufacture such a retardation film, the thickness of the entire panel increases when the retardation film is attached to the liquid crystal panel. In addition, since the price of the retardation film is expensive, it has a problem of weakening the price competitiveness of the entire panel.

본 발명의 과제는 액정 패널의 내부에 위상차 보상막이 내장되어 있는 액정 표시 장치를 제조하는 것이다.An object of the present invention is to manufacture a liquid crystal display device in which a retardation compensation film is incorporated in the liquid crystal panel.

본 발명에 따른 액정 표시 장치에서는 광학적 이방성을 가진 물질로 이루어진 위상차 보상막이 두 기판의 안쪽 면에 각각 형성되어 있다.In the liquid crystal display according to the present invention, retardation compensation films made of a material having optical anisotropy are formed on inner surfaces of the two substrates, respectively.

이러한 위상차 보상막 중 TN 방식의 액정 패널 내부에 형성되어 있는 위상차 보상막은, 분자의 광축이 기판 근처에서 멀어질수록 기판의 법선에 대해 순차적으로 점점 작은 각도를 갖도록(hybrid) 배열하여 액정 분자에 의한 빛의 지연의 차이를 보상한다. Among the retardation compensating films, the retardation compensating film formed inside the TN-type liquid crystal panel is arranged to have a smaller and smaller angle sequentially with respect to the normal of the substrate as the optical axis of the molecule moves away from the substrate. Compensates for differences in light delay.

여기서, 분자 광축의 방위각은 액정 표시 장치의 기판의 법선을 중심으로 셀 내의 액정 분자의 방향과 반대 방향이며, 분자의 광축은 액정 분자의 비틀림 방향에 대하여 반대 방향으로 비틀리도록(twist) 배열할 수도 있다. Here, the azimuth angle of the molecular optical axis is the opposite direction to the direction of the liquid crystal molecules in the cell around the normal of the substrate of the liquid crystal display device, the optical axis of the molecules may be arranged to be twisted in the opposite direction to the twist direction of the liquid crystal molecules. have.

이러한 보상막은 원반 모양의(discotic) 분자 구조를 갖는 음의 일축성 광학 이방체인 물질로 만들어질 수 있다. Such a compensation film may be made of a material that is a negative uniaxial optically anisotropic body having a discotic molecular structure.

이제 첨부한 도면을 참고로 하여 본 발명에 따른 액정 표시 장치의 실시예를 본 발명이 속하는 기술 분야에서 통상의 기술을 가진 자가 용이하게 실시할 수 있을 정도로 상세히 설명한다.DETAILED DESCRIPTION Embodiments of the liquid crystal display according to the present invention will now be described in detail with reference to the accompanying drawings so that those skilled in the art to which the present invention pertains can easily practice the present invention.

도 1은 본 발명의 실시예에 따른 액정 표시 장치의 단면도이다. 1 is a cross-sectional view of a liquid crystal display according to an exemplary embodiment of the present invention.

도 1에 나타난 바와 같이, 본 발명의 실시예에 따른 액정 표시 장치는 안쪽 면에 위상차 보상막(210, 220)이 각각 형성되어 있는 한 쌍의 투명 기판(110, 120), 두 투명 기판(110, 120) 사이의 액정 물질(300) 및 두 투명 기판(110, 120) 바깥 면에 부착되어 빛을 편광시키는 두 장의 편광판(510, 520)으로 구성된다.As shown in FIG. 1, in the liquid crystal display according to the exemplary embodiment of the present invention, a pair of transparent substrates 110 and 120 and two transparent substrates 110 having retardation compensation layers 210 and 220 formed on an inner surface thereof, respectively, are provided. And the two polarizing plates 510 and 520 attached to the liquid crystal material 300 and the outer surfaces of the two transparent substrates 110 and 120 to polarize light.

비틀린 네마틱 액정 표시 장치에 전압을 인가하게 되면, 도 1에 나타난 바와 같이 액정 셀의 중앙부(310)에서는 액정 분자들이 수직으로 서 있지만, 충분한 전압을 인가하더라도 기판 근처(321, 322)의 액정 분자들은 기판에 도포된 배향막 (도시하지 않음)의 배향 규제력으로 인해 액정 분자들이 러빙 방향 쪽으로 비틀리며 기판에 대해 경사지게 늘어서 있다. 따라서 이 경우 셀의 중앙부(310)에서는 광축이 기판의 법선 방향에 있는 양의 일축성 광학 이방체라고 할 수 있지만, 기판 부근(321, 322)에서는 기판에 대해 경사져 있고 또 비틀려 있으므로 광축이 기판의 법선 방향에 대해 경사진 양의 일축성 광학 이방체들이 비틀린 형태라고 할 수 있다. 따라서, 이 경우 음의 일축성 광학 이방체로 이루어진 위상차 보상막(210, 220)을 사용해서 액정 분자에 의한 빛의 지연의 차이를 보상한다. When a voltage is applied to the twisted nematic liquid crystal display, as shown in FIG. 1, the liquid crystal molecules stand vertically at the central portion 310 of the liquid crystal cell, but the liquid crystal molecules near the substrates 321 and 322 are applied even if a sufficient voltage is applied. These liquid crystal molecules are twisted toward the rubbing direction and are inclined to the substrate due to the alignment control force of the alignment film (not shown) applied to the substrate. Therefore, in this case, the optical axis is positive uniaxial optically anisotropic body in the normal direction of the substrate in the center portion 310 of the cell, but in the vicinity of the substrate 321 and 322, the optical axis is inclined and twisted with respect to the substrate. It can be said that the positive uniaxial optical anisotropes inclined with respect to the normal direction are twisted. Therefore, in this case, phase difference compensation films 210 and 220 made of negative uniaxial optically anisotropic bodies are used to compensate for the difference in light delay caused by the liquid crystal molecules.

본 발명의 실시예에 따른 액정 표시 장치에서 위상차 보상막(210, 220)은 원반 모양의(discotic) 분자 구조를 갖는 음의 일축성 광학 이방체인 물질로 만들어진다. 이때, 원반 모양의 분자(211, 221)들이 분자(211, 221)의 광축이 액정 표시 장치의 기판(110, 120)의 법선에 대해 기판(110, 120)으로부터 멀어질수록 순차적으로 점점 작은 각도를 갖도록(hybrid) 배열하고 있다.In the liquid crystal display according to the exemplary embodiment of the present invention, the retardation compensation layers 210 and 220 are made of a material that is a negative uniaxial optical anisotropy having a discotic molecular structure. In this case, the disk-shaped molecules 211 and 221 are gradually smaller and smaller as the optical axes of the molecules 211 and 221 move away from the substrates 110 and 120 with respect to the normal of the substrates 110 and 120 of the liquid crystal display. It is arranged to have (hybrid).

이때, 분자(211, 221)들의 광축 방위각은 액정 표시 장치의 기판(110, 120)의 법선을 중심으로 기판 부근(321, 322)의 액정 분자의 방향과 반대 방향이다.In this case, the optical axis azimuth of the molecules 211 and 221 is opposite to the direction of the liquid crystal molecules near the substrates 321 and 322 around the normal of the substrates 110 and 120 of the liquid crystal display.

분자(211, 221)의 광축은 액정 분자의 비틀림 방향에 대하여 반대 방향으로 비틀리도록(twist) 배열할 수도 있다. 이러한 형태의 분자 구조를 갖는 위상차 보상막은 비틀린 하이브리드(twist-hybrid) 보상막이라고 하기로 한다. The optical axes of the molecules 211 and 221 may be arranged to be twisted in a direction opposite to the twisting direction of the liquid crystal molecules. The retardation compensation film having this type of molecular structure will be referred to as a twist-hybrid compensation film.

이러한 위상차 보상막(210, 220)은 액정 표시 장치의 제조 공정에서 박막 트랜지스터나 컬러 필터를 형성하기 전에 형성한다.The phase difference compensation layers 210 and 220 are formed before forming the thin film transistor or the color filter in the manufacturing process of the liquid crystal display.

우선, 기판(110, 120)의 상부에 배향막(도시하지 않음)을 형성하고 러빙 공정을 실시한다. 다음, 스핀 코팅(spin coating) 방식을 통하여 위상차 보상막(210, 220)을 형성한다. 이때, 위상차 보상막(210, 220)의 분자(211, 221)들은 배향막의 배향력에 의해서 기판(110, 120)의 법선에 대해 기판(110, 120)으로부터 멀어질수록 순차적으로 점점 작은 각도를 갖도록(hybrid) 배열된다. 다음, 자외선을 조사하여 위상차 보상막(210, 220)의 분자(211, 221)를 고착시킨다.First, an alignment film (not shown) is formed on the substrates 110 and 120 and a rubbing process is performed. Next, the phase difference compensation layers 210 and 220 are formed through spin coating. At this time, the molecules 211 and 221 of the retardation compensation layers 210 and 220 are gradually smaller and smaller from the substrates 110 and 120 with respect to the normal of the substrates 110 and 120 by the alignment force of the alignment layer. It is arranged to be hybrid. Next, ultraviolet rays are irradiated to fix the molecules 211 and 221 of the retardation compensation layers 210 and 220.

따라서, 본 발명에서는 액정 패널의 내부에 위상차 보상막을 형성함으로써 액정 표시 장치의 두께를 줄일 수 있으며, 가격 경쟁력도 높일 수 있다.Therefore, in the present invention, the thickness of the liquid crystal display device can be reduced by forming a phase difference compensation film inside the liquid crystal panel, and the price competitiveness can be enhanced.

도 1은 본 발명의 실시예에 따른 액정 표시 장치의 단면도이다.1 is a cross-sectional view of a liquid crystal display according to an exemplary embodiment of the present invention.

Claims (5)

한 쌍의 투명 유리 기판,A pair of transparent glass substrates, 상기 한 쌍의 유리 기판의 안쪽 면에 각각 형성되어 있으며, 광학적 이방성을 가진 물질 분자로 이루어진 위상차 보상막,A phase difference compensation film formed on inner surfaces of the pair of glass substrates, the material molecules having optical anisotropy, 상기 투명 기판 사이에 주입되어 있는 액정 물질, A liquid crystal material injected between the transparent substrates, 상기 투명 기판의 바깥 면에 각각 부착되어 있는 편광판을 포함하고, A polarizing plate attached to an outer surface of the transparent substrate, 상기 위상차 보상막의 상기 물질 분자는 상기 물질 분자의 광축이 상기 기판의 법선에 대해 상기 기판으로부터 멀어질수록 점점 작은 각도로 배열되어 있는 액정 표시 장치.And the material molecules of the retardation compensation layer are arranged at an increasingly smaller angle as the optical axis of the material molecules moves away from the substrate with respect to the normal of the substrate. 제1항에서,In claim 1, 상기 물질 분자는 음의 일축성 광학 이방체인 액정 표시 장치.The material molecule is a negative uniaxial optically anisotropic liquid crystal display device. 제2항에서,In claim 2, 상기 물질 분자는 원반 모양을 가진 액정 표시 장치.The material molecule has a disc shape. 제3항에서,In claim 3, 상기 물질 분자의 광축 방위각은 상기 기판의 법선을 중심으로 상기 기판 부근의 상기 액정 물질의 액정 분자의 방향과 반대 방향인 액정 표시 장치.The optical axis azimuth angle of the material molecules is opposite to the direction of the liquid crystal molecules of the liquid crystal material near the substrate with respect to the normal of the substrate. 제4항에서,In claim 4, 상기 물질 분자의 광축 방위각은 상기 액정 분자의 비틀림 방향에 대하여 반대 방향으로 비틀리도록(twist) 배열되어 있는 액정 표시 장치.And an optical axis azimuth angle of the material molecules is arranged to be twisted in a direction opposite to the twist direction of the liquid crystal molecules.
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US6181400B1 (en) * 1999-11-19 2001-01-30 International Business Machines Corporation Discotic-type twist-film compensated single-domain or two-domain twisted nematic liquid crystal displays
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JPH03105318A (en) * 1989-09-20 1991-05-02 Hitachi Ltd Liquid crystal display device
KR930022120A (en) * 1992-04-30 1993-11-23 박경팔 Variable optical retardation compensation film
KR940007566A (en) * 1992-09-07 1994-04-27 박경팔 Reflective liquid crystal display device using polymer dispersed liquid crystal in scattering mode
JPH08334757A (en) * 1995-04-07 1996-12-17 Sumitomo Chem Co Ltd Liquid crystal display device, polarization phase difference composite film and their production

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JPH03105318A (en) * 1989-09-20 1991-05-02 Hitachi Ltd Liquid crystal display device
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KR940007566A (en) * 1992-09-07 1994-04-27 박경팔 Reflective liquid crystal display device using polymer dispersed liquid crystal in scattering mode
JPH08334757A (en) * 1995-04-07 1996-12-17 Sumitomo Chem Co Ltd Liquid crystal display device, polarization phase difference composite film and their production

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