KR20120066813A - Liquid crystal display device - Google Patents

Liquid crystal display device Download PDF

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KR20120066813A
KR20120066813A KR1020100128091A KR20100128091A KR20120066813A KR 20120066813 A KR20120066813 A KR 20120066813A KR 1020100128091 A KR1020100128091 A KR 1020100128091A KR 20100128091 A KR20100128091 A KR 20100128091A KR 20120066813 A KR20120066813 A KR 20120066813A
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liquid crystal
layer
crystal display
polarizing film
crystal layer
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KR1020100128091A
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Korean (ko)
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KR101714793B1 (en
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이상욱
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엘지디스플레이 주식회사
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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
    • 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
    • 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
    • G02F1/133509—Filters, e.g. light shielding masks
    • G02F1/133512—Light shielding layers, e.g. black matrix
    • 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
    • G02F1/133509—Filters, e.g. light shielding masks
    • G02F1/133514—Colour filters
    • 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
    • G02F1/133528—Polarisers
    • 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
    • G02F1/1347—Arrangement of liquid crystal layers or cells in which the final condition of one light beam is achieved by the addition of the effects of two or more layers or cells
    • G02F1/13471—Arrangement of liquid crystal layers or cells in which the final condition of one light beam is achieved by the addition of the effects of two or more layers or cells in which all the liquid crystal cells or layers remain transparent, e.g. FLC, ECB, DAP, HAN, TN, STN, SBE-LC cells
    • 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

Abstract

PURPOSE: A liquid crystal display device is provided to increase response ratio and to reduce the multiplex of liquid crystal layer refraction ratio anisotropy and liquid crystal layer thickness. CONSTITUTION: A first polarizing film is arranged in one side of an LCD panel. A second polarizing film has an optical transmission axis. The optical transmission axis is arranged in the other side of the LCD panel. The optical transmission axis is crossed with the first polarizing film. A viewing angle compensating layer(300) is arranged between the LCD panel and the second polarizing film.

Description

액정표시장치{Liquid crystal display device}[0001] Liquid crystal display device [0002]

본 발명은 액정표시장치에 관한 것으로, 응답속도를 개선할 수 있는 TN 모드 액정표시장치에 관한 것이다.
The present invention relates to a liquid crystal display device, and to a TN mode liquid crystal display device capable of improving a response speed.

일반적으로 액정표시장치는 저소비 전력으로 구동될 뿐만 아니라 박형화의 가능으로 최근 디스플레이 산업분야에서 널리 이용되고 있다.In general, the liquid crystal display device is not only driven by low power consumption, but also widely used in the display industry because of its thinness.

이와 같은, 액정 표시 장치(Liquid Crystal Display device)는 비디오 신호에 따라 액정 셀들의 광투과율을 조절하여 화상을 표시하게 된다. Such a liquid crystal display device displays an image by adjusting light transmittance of liquid crystal cells according to a video signal.

최근 갈수록 증가되고 있는 고품위, 고용량의 표시 정보 처리 및 뛰어난 동영상 표시 특성을 확보하기 위한 기술목표 중 하나는 빠른 응답 특성을 갖는 것이다. 이와 같이 고속응답을 위해서는 액정 물질의 회전 점도를 줄이거나 셀갭을 낮춰 액정의 굴절률을 크게 하는 방안 등이 있었다.One of the technical goals for securing high quality, high capacity display information processing and excellent video display characteristics, which are increasing in recent years, is to have fast response characteristics. As described above, for the high speed response, there are ways to increase the refractive index of the liquid crystal by reducing the rotational viscosity of the liquid crystal material or lowering the cell gap.

즉, 액정의 응답 속도를 감소시키기 위한 개선 방법으로 액정 점도나 셀갭을 감소시키거나 액정 유전율 이방성 또는 구동 전압을 증가하여 구현할 수 있었다.That is, as an improvement method for reducing the response speed of the liquid crystal, the liquid crystal viscosity or the cell gap may be reduced or the liquid crystal dielectric anisotropy or driving voltage may be increased.

하지만, 현재, 액정 점도의 감소시키거나 액정 유전율 이방성을 증가시킬 수 있는 새로운 액정 개발이 이루어지고 있지 않을 뿐만 아니라, 아직까지 각종 특이 얼룩이 발생하거나 무라가 발생하는 등과 같은 화질 문제가 발생하였다. 또한, 셀 갭의 축소는 이물에 의한 상하전극간의 쇼트가 발생하는 문제점이 발생하였다. 또한, 구동 전압의 증가는 소비 전력이 증가하는 문제점이 있을 뿐만 아니라 새로운 구동 회로를 개발하기 위한 비용이 증가하는 문제점이 있었다.However, at present, not only are new liquid crystals not being developed that can reduce the liquid crystal viscosity or increase the liquid crystal dielectric anisotropy, but also have caused image quality problems such as various specific stains or mura. In addition, the reduction of the cell gap has caused a problem of short circuit between the upper and lower electrodes due to foreign matter. In addition, an increase in driving voltage not only has a problem of increasing power consumption, but also has a problem of increasing costs for developing a new driving circuit.

이와 같이, 액정표시장치의 응답속도를 개선하기 위해 많은 연구가 이루어졌으나, 응답속도 개선에 따른 또 다른 불량을 야기하는 문제점이 발생됨에 따라, 응답속도의 개선을 위한 새로운 대안이 요구되고 있는 실정이다.
As described above, many studies have been conducted to improve the response speed of the liquid crystal display, but as a problem causing another defect caused by the improvement of the response speed occurs, a new alternative for improving the response speed is required. .

따라서, 본 발명은 액정표시장치에서 발생될 수 있는 문제점을 해결하기 위하여 창안된 것으로서, 구체적으로 종래와 대비하여 액정층의 굴절률 이방성(△n)과 액정층의 두께의 곱을 감소시켜 응답속도를 개선할 수 있는 TN 모드의 액정표시장치 를 제공함에 그 목적이 있다.
Accordingly, the present invention was devised to solve a problem that may occur in a liquid crystal display device. Specifically, the response speed is improved by reducing the product of the refractive index anisotropy (Δn) of the liquid crystal layer and the thickness of the liquid crystal layer, as compared with the conventional art. It is an object of the present invention to provide a TN mode liquid crystal display device.

본 발명에 따른 해결 수단의 액정표시장치를 제공한다. 상기 액정표시장치는 컬러필터 기판과 박막트랜지스터 기판 및 상기 컬러 필터 기판과 상기 박막트랜지스터 기판 사이에 개재된 액정층을 구비하는 액정표시패널; 상기 액정표시패널의 일면에 배치된 제 1 편광필름; 상기 액정표시패널의 타면에 배치되며 상기 제 1 편광필름과 수직하게 교차하는 광투과축을 갖는 제 2 편광필름; 및 상기 액정표시패널과 상기 제 2 편광필름 사이에 개재된 시야각 보상층;을 포함하며,A liquid crystal display device of the solution according to the present invention is provided. The liquid crystal display device includes a liquid crystal display panel including a color filter substrate, a thin film transistor substrate, and a liquid crystal layer interposed between the color filter substrate and the thin film transistor substrate; A first polarizing film disposed on one surface of the liquid crystal display panel; A second polarizing film disposed on the other surface of the liquid crystal display panel and having a light transmission axis perpendicular to the first polarizing film; And a viewing angle compensation layer interposed between the liquid crystal display panel and the second polarizing film.

상기 액정층의 굴절률 이방성(△n)과 상기 액정층의 두께의 곱은 400 내지 500nm를 가질 수 있다.
The product of the refractive index anisotropy (Δn) of the liquid crystal layer and the thickness of the liquid crystal layer may have a 400 to 500 nm.

본 발명의 실시예에 따른 액정표시장치는 액정층의 셀갭이나 액정층의 점도조절의 필요없이 액정층의 굴절률 이방성(△n)과 액정층의 두께의 곱을 감소시키는 설계에 의해, 종래 셀갭 조절에 의한 상하부 전극의 쇼트불량 및 얼룩불량과 같은 불량이 발생하는 것을 방지하며 액정의 응답속도를 개선할 수 있다.The liquid crystal display device according to the embodiment of the present invention is designed to reduce the product of the refractive index anisotropy (Δn) of the liquid crystal layer and the thickness of the liquid crystal layer without the need of adjusting the cell gap of the liquid crystal layer or the viscosity of the liquid crystal layer. It is possible to prevent defects such as short defects and unevenness of the upper and lower electrodes, and to improve the response speed of the liquid crystal.

또한, 본 발명의 실시예에 따른 액정표시장치는 디스코틱 액정층을 포함한 보상필름의 채용으로 인해 액정층의 굴절률 이방성(△n)과 액정층의 두께의 곱을 감소시키는 설계로 인해 발생할 수 있는 협시야각 문제를 해소할 수 있다.
In addition, the liquid crystal display according to the embodiment of the present invention is due to the adoption of a compensation film including a discotic liquid crystal layer due to the design of reducing the product of the refractive index anisotropy (△ n) of the liquid crystal layer and the thickness of the liquid crystal layer The viewing angle problem can be solved.

도 1은 본 발명의 실시예에 따른 액정표시장치의 단면도이다.
도 2는 액정층의 굴절률 이방성(△n)과 액정층의 두께의 곱에 따른 투과율 의 변화율을 보여주는 그래프이다.
도 3은 액정층의 굴절률 이방성(△n)과 액정층의 두께의 곱에 따른 액정의 응답속도 변화율을 보여주는 그래프이다.
도 4는 액정층의 굴절률 이방성(△n)과 액정층의 두께의 곱에 따른 색좌표의 변화를 보여주는 도면이다.1 is a cross-sectional view of a liquid crystal display device according to an exemplary embodiment of the present invention.
2 is a graph showing the change rate of transmittance according to the product of the refractive index anisotropy (Δn) of the liquid crystal layer and the thickness of the liquid crystal layer.
3 is a graph showing the response rate change rate of the liquid crystal according to the product of the refractive index anisotropy (Δn) of the liquid crystal layer and the thickness of the liquid crystal layer.
4 is a view showing a change in color coordinates according to the product of the refractive index anisotropy (Δn) of the liquid crystal layer and the thickness of the liquid crystal layer.

본 발명의 실시예들은 액정표시장치의 도면을 참고하여 상세하게 설명한다. 다음에 소개되는 실시예들은 당업자에게 본 발명의 사상이 충분히 전달될 수 있도록 하기 위해 예로서 제공되어지는 것이다. Embodiments of the present invention will be described in detail with reference to the drawings of the liquid crystal display. The following embodiments are provided by way of example so that those skilled in the art can fully understand the spirit of the present invention.

따라서, 본 발명은 이하 설명되어지는 실시예들에 한정되지 않고 다른 형태로 구체화될 수도 있다. 그리고, 도면들에 있어서, 장치의 크기 및 두께 등은 편의를 위하여 과장되어 표현될 수도 있다. 명세서 전체에 걸쳐서 동일한 참조번호들은 동일한 구성요소들을 나타낸다.Therefore, the present invention is not limited to the embodiments described below, but may be embodied in other forms. In the drawings, the size and thickness of an apparatus may be exaggerated for convenience. Like numbers refer to like elements throughout.

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

도 1을 참조하면, 본 발명의 실시예에 따른 액정표시장치는 액정표시패널(100), 제 1 및 제 2 편광필름(210, 220), 시야각 보상층(300)을 포함할 수 있다.Referring to FIG. 1, the liquid crystal display according to the exemplary embodiment of the present invention may include a liquid crystal display panel 100, first and second polarizing films 210 and 220, and a viewing angle compensation layer 300.

여기서, 액정표시패널(100)은 박막트랜지스터 기판(110), 컬러필터 기판(120), 및 컬러필터 기판(120)과 박막트랜지스터 기판(110) 사이에 개재된 액정층(130)을 포함할 수 있다.The liquid crystal display panel 100 may include a thin film transistor substrate 110, a color filter substrate 120, and a liquid crystal layer 130 interposed between the color filter substrate 120 and the thin film transistor substrate 110. have.

도면에는 박막트랜지스터 기판(110)과 컬러필터 기판(120)의 구조를 구체적으로 도시하지 않았으나, 박막트랜지스터 기판(110)은 서로 교차하는 게이트 배선과 데이터 배선에 의해 정의된 화소를 다수개 갖는 제 1 기판(111), 제 1 기판(111)의 각 화소에 배치된 박막트랜지스터를 포함할 수 있다. 박막트랜지스터는 제 1 기판(111)상에 배치된 게이트 전극, 게이트 전극을 포함한 제 1 기판(111)상에 배치된 게이트 절연막, 게이크 전극과 대응된 게이트 절연막상에 배치된 반도체층, 반도체층 상에 서로 이격되어 배치된 소스 및 드레인 전극을 포함할 수 있다. 여기서, 게이트 전극은 게이트 배선과 연결되며, 소스 전극은 데이터 배선과 전기적으로 연결되어 있을 수 있다. 이에 더하여, 박막트랜지스터를 덮으며 제 1 기판(110)상에 배치된 보호막이 더 배치될 수 있다. 보호막 상에 박막트랜지스터와 전기적으로 연결된 화소전극(112)과, 화소전극(112)을 포함한 보호막 상에 제 1 배향막(113)이 배치될 수 있다.Although the structures of the thin film transistor substrate 110 and the color filter substrate 120 are not illustrated in detail, the thin film transistor substrate 110 may include a first pixel having a plurality of pixels defined by gate lines and data lines crossing each other. The substrate 111 may include a thin film transistor disposed at each pixel of the first substrate 111. The thin film transistor includes a gate electrode disposed on the first substrate 111, a gate insulating layer disposed on the first substrate 111 including the gate electrode, a semiconductor layer disposed on the gate insulating layer corresponding to the gate electrode, and a semiconductor layer. It may include a source and drain electrode spaced apart from each other on the phase. The gate electrode may be connected to the gate line, and the source electrode may be electrically connected to the data line. In addition, a passivation layer covering the thin film transistor and disposed on the first substrate 110 may be further disposed. The pixel electrode 112 electrically connected to the thin film transistor on the passivation layer and the first alignment layer 113 may be disposed on the passivation layer including the pixel electrode 112.

한편, 컬러필터 기판(120)은 제 2 기판(121), 제 2 기판(121) 중 화소의 주변에 배치된 블랙매트릭스층과 제 2 기판(121)의 화소에 배치된 컬러필터층, 블랙매트릭스층과 컬러필터층 상에 배치된 공통전극(122), 공통전극(122) 상에 배치된 제 2 배향막(123)을 포함할 수 있다.Meanwhile, the color filter substrate 120 includes the second matrix 121 and the black matrix layer disposed around the pixels of the second substrate 121 and the color filter layer and the black matrix layer disposed on the pixels of the second substrate 121. And a common electrode 122 disposed on the color filter layer and a second alignment layer 123 disposed on the common electrode 122.

액정층(130)은 트위스티드 네마틱 액정을 포함할 수 있다. 여기서, 액정층(130)의 설계 변경을 통해 액정표시장치의 응답속도를 개선할 수 있다. The liquid crystal layer 130 may include a twisted nematic liquid crystal. Here, the response speed of the liquid crystal display may be improved by changing the design of the liquid crystal layer 130.

도 2는 액정층의 굴절률 이방성(△n)과 액정층의 두께의 곱에 따른 투과율 의 변화율을 보여주는 그래프이다.2 is a graph showing the change rate of transmittance according to the product of the refractive index anisotropy (Δn) of the liquid crystal layer and the thickness of the liquid crystal layer.

도 3은 액정층의 굴절률 이방성(△n)과 액정층의 두께의 곱에 따른 액정의 응답속도 변화율을 보여주는 그래프이다.3 is a graph showing the response rate change rate of the liquid crystal according to the product of the refractive index anisotropy (Δn) of the liquid crystal layer and the thickness of the liquid crystal layer.

도 4는 액정층의 굴절률 이방성(△n)과 액정층의 두께의 곱에 따른 색좌표의 변화를 보여주는 도면이다.4 is a view showing a change in color coordinates according to the product of the refractive index anisotropy (Δn) of the liquid crystal layer and the thickness of the liquid crystal layer.

도 2 및 도 3에서와 같이, 액정층의 굴절률 이방성(△n)과 액정층의 두께의 곱이 감소할 수록 액정의 펄링 타임(falling time)이 감소하는 것을 확인할 수 있었다. 여기서, 액정의 응답속도는 액정의 라이징 타임(rising time)과 액정의 펄링 타임(falling time)의 합으로써, 액정의 펄링 타임의 감소로 인해 액정의 응답속도가 감소하는 것을 확인할 수 있었다.As shown in FIGS. 2 and 3, as the product of the refractive index anisotropy (Δn) of the liquid crystal layer and the thickness of the liquid crystal layer decreases, the falling time of the liquid crystal decreases. Here, the response speed of the liquid crystal is the sum of the rising time of the liquid crystal and the falling time of the liquid crystal, and it was confirmed that the response speed of the liquid crystal decreases due to the decrease in the pearling time of the liquid crystal.

즉, 액정표시장치의 응답속도를 개선하기 위해, 액정층의 굴절률 이방성(△n)과 액정층의 두께의 곱은 기존보다 감소시키는 것이 바람직하다. 이때, 액정층의 굴절률 이방성(△n)과 액정층의 두께의 곱은 400 내지 500nm를 갖는400 내지 500nm를 가질 수 있다. 이는, 액정층의 굴절률 이방성(△n)과 액정층의 두께의 곱이 400nm 미만일 경우, 액정표시장치의 광투과율이 저하될 수 있다. That is, in order to improve the response speed of the liquid crystal display, it is preferable to reduce the product of the refractive index anisotropy (Δn) of the liquid crystal layer and the thickness of the liquid crystal layer than before. In this case, the product of the refractive index anisotropy (Δn) of the liquid crystal layer and the thickness of the liquid crystal layer may have 400 to 500 nm having 400 to 500 nm. When the product of the refractive index anisotropy (Δn) of the liquid crystal layer and the thickness of the liquid crystal layer is less than 400 nm, the light transmittance of the liquid crystal display may be lowered.

반면, 도 4에서와 같이, 액정층의 굴절률 이방성(△n)과 액정층의 두께의 곱이 500nm를 초과할 경우, 액정표시장치의 색좌표가 변동되어 색재현율이 저하될 수 있기 때문이다.On the other hand, as shown in FIG. 4, when the product of the refractive index anisotropy (Δn) of the liquid crystal layer and the thickness of the liquid crystal layer exceeds 500 nm, the color coordinates of the liquid crystal display may be changed to reduce the color reproducibility.

다시 도 1을 참조하면, 제 1 편광필름(210)은 액정표시패널(100)의 일면, 예컨대 제 1 기판(111)의 외측면에 배치될 수 있다. 제 1 편광필름(210)에는 일방향으로 투과축이 형성되어 있어, 제 1 편광필름(210)을 통과하는 광은 투과축에 평행한 성분만 투과될 수 있다. 여기서, 제 1 편광필름(210)을 형성하는 방법의 예로서는 요오드를 흡수한 폴리 비닐 알코올을 강한 자력으로 연신하여 제작될 수 있다. 그러나, 본 발명의 실시예에서 제 1 편광필름(210)의 재질이나 제조 방법을 한정하는 것은 아니다.Referring back to FIG. 1, the first polarizing film 210 may be disposed on one surface of the liquid crystal display panel 100, for example, an outer surface of the first substrate 111. Since a transmission axis is formed in one direction in the first polarizing film 210, light passing through the first polarizing film 210 may transmit only components parallel to the transmission axis. Here, as an example of a method of forming the first polarizing film 210 may be produced by stretching the polyvinyl alcohol absorbed iodine with a strong magnetic force. However, the embodiment of the present invention does not limit the material or the manufacturing method of the first polarizing film 210.

이에 더하여, 도면에는 도시하지 않았으나, 제 1 편광필름(210)의 상하부에 각각 보호필름이 배치될 수 있다. 여기서, 보호필름은 제 1 편광필름(210)을 보호하고 지지하는 역할을 할 수 있다. 이때, 보호필름을 형성하는 재질의 예로서는 TAC (Tri-Acetate Cellulose) 필름일 수 있다. In addition, although not shown in the drawings, protective films may be disposed on upper and lower portions of the first polarizing film 210, respectively. Here, the protective film may serve to protect and support the first polarizing film 210. In this case, an example of a material for forming the protective film may be a TAC (Tri-Acetate Cellulose) film.

또한, 제 2 편광필름(220)은 액정표시패널(100)의 타면, 예컨대 제 2 기판(121)의 타측면에 배치될 수 있다. 여기서, 제 2 편광필름(220)에는 제 1 편광필름(210)과 수직하게 교차하는 투과축이 형성되어 있다. 여기서, 제 2 편광필름(220)을 보호하며 지지하기 위해, 제 2 편광필름(220)의 상하부에 각각 보호필름이 더 배치될 수 있다.In addition, the second polarizing film 220 may be disposed on the other side of the liquid crystal display panel 100, for example, the other side of the second substrate 121. Here, the transmission axis which is perpendicular to the first polarizing film 210 is formed in the second polarizing film 220. Here, in order to protect and support the second polarizing film 220, protective films may be further disposed on the upper and lower portions of the second polarizing film 220, respectively.

이에 더하여, 액정층(130)의 굴절률 이방성(△n)과 액정층(130)의 두께의 곱을 종래와 대비하여 감소할 경우, 시야각이 감소하는 문제점이 있었다.In addition, when the product of the refractive index anisotropy (Δn) of the liquid crystal layer 130 and the thickness of the liquid crystal layer 130 is decreased in comparison with the related art, the viewing angle may be reduced.

이와 같은 시야각의 감소를 방지하기 위해, 액정표시패널(100)과 제 2 편광필름(220)사이에 시야각 보상층(300)을 더 구비할 수 있다. 여기서, 시야각 보상층(300)은 종래의 설계대로 이용될 경우 본 발명에서와 같이 액정의 설계가 변경된 상태에서 액정표시장치의 시야각을 개선하는데 한계가 있었다. 이에 따라, 종래의 시야각 보상층(300)을 이용할 수 없어, 시야각 보상층(300)에 대한 새로운 개발이 요구되었다. In order to prevent the reduction of the viewing angle, the viewing angle compensation layer 300 may be further provided between the liquid crystal display panel 100 and the second polarizing film 220. Here, when the viewing angle compensation layer 300 is used according to the conventional design, there is a limit in improving the viewing angle of the liquid crystal display in a state where the design of the liquid crystal is changed as in the present invention. Accordingly, the conventional viewing angle compensation layer 300 cannot be used, and a new development for the viewing angle compensation layer 300 has been required.

본 발명의 실시예에 따른 시야각 보상층(300)은 지지층(310)과 지지층(310) 상에 배치된 디스코틱 액정층(320)을 포함할 수 있다. 이때, 지지층(310)이 제 2 편광필름에 접착하게 될 수 있다. 여기서, 지지층(310)은 디스코틱 액정층(320)을 지지하며 보호하는 역할을 할 수 있다. 지지층(310)을 형성하는 재질의 예로서는 TAC (Tri-Acetate Cellulose) 필름일 수 있다. 또한, 디스코틱 액정층(320)은 액정층(130)의 굴절 이방성을 보상하는 역할을 하여, 결국 액정표시장치의 시야각을 개선할 수 있다. The viewing angle compensation layer 300 according to the embodiment of the present invention may include a support layer 310 and a discotic liquid crystal layer 320 disposed on the support layer 310. In this case, the support layer 310 may be attached to the second polarizing film. Here, the support layer 310 may serve to support and protect the discotic liquid crystal layer 320. An example of a material for forming the support layer 310 may be a Tri-Acetate Cellulose (TAC) film. In addition, the discotic liquid crystal layer 320 serves to compensate for the refractive anisotropy of the liquid crystal layer 130, thereby improving the viewing angle of the liquid crystal display device.

하기 표 1은 시야각 보상층의 디스코틱 액정층의 굴절률 변화에 따른 시야각 변화를 비교하는 표이다.Table 1 is a table comparing the change in viewing angle according to the refractive index change of the discotic liquid crystal layer of the viewing angle compensation layer.

디스코틱 액정층의 굴절률Refractive Index of Discotic Liquid Crystal Layer 액정층의 △ndΔnd of the liquid crystal layer 시야각(좌/우/상/하)Viewing Angle (Left / Right / Up / Down) 비교예(기설정된 값)Comparative Example (Preset Value) 0.058110.05811 414nm414nm 57/57/40/5457/57/40/54 실험예 1Experimental Example 1 0.068110.06811 445nm445 nm 51/51/38/5251/51/38/52 실험예 2Experimental Example 2 0.053110.05311 445nm445 nm 57/57/43/5557/57/43/55 실험예 3Experimental Example 3 0.048110.04811 445nm445 nm 59/59/44/5759/59/44/57

상기 표 1에서와 같이, 액정층의 디스코틱 액정층의 굴절률이 기설정된 값, 즉 0.05811보다 감소될 경우, 액정표시장치의 시야각이 개선됨을 확인할 수 있었다. 예컨대, 디스코틱 액정의 굴절률이 0.04811 내지 0.05311의 범위를 가질 경우, 시야각이 종래보다 향상되는 되는 것을 확인할 수 있었다.As shown in Table 1, when the refractive index of the discotic liquid crystal layer of the liquid crystal layer is lower than the predetermined value, that is, 0.05811, it was confirmed that the viewing angle of the liquid crystal display device is improved. For example, when the refractive index of the discotic liquid crystal has a range of 0.04811 to 0.05311, it was confirmed that the viewing angle is improved than before.

하기 표 2는 시야각 보상층의 디스코틱 액정의 틸트 앵글값의 변화에 따른 시야각 변화를 비교하는 표이다.Table 2 is a table comparing the change in viewing angle according to the change in the tilt angle value of the discotic liquid crystal of the viewing angle compensation layer.

틸트앵글Tilt Angle 액정층의 △ndΔnd of the liquid crystal layer 시야각(좌/우/상/하)Viewing Angle (Left / Right / Up / Down) 비교예(기설정된값)Comparative Example (Preset Value) 79°79 ° 414nm414nm 57/57/40/5457/57/40/54 실험예1Experimental Example 1 83°83 ° 445nm445 nm 53/53/40/5353/53/40/53 실험예2Experimental Example 2 77°77 ° 445nm445 nm 55/55/42/5455/55/42/54 실험예3Experimental Example 3 75°75 ° 445nm445 nm 57/57/43/5557/57/43/55

상기 표 2에서와 같이, 디스코틱 액정의 틸트 앵글값이 기설정된 값, 즉 79°보다 감소될 경우 액정표시장치의 시야각이 개선됨을 확인할 수 있었다. 예컨대, 지지층의 표면에 대하여 75° 내지 77°의 범위를 가질 경우, 시야각이 종래보다 향상되는 것을 확인할 수 있었다. 이때, 제 2 편광필름과 접하는 디스코틱 액정의 틸트 앵글값은 제 1 편광필름을 기준으로 7°의 틸트 앵글값을 가질 수 있다.As shown in Table 2, when the tilt angle value of the discotic liquid crystal is less than the predetermined value, that is, 79 ° it can be seen that the viewing angle of the liquid crystal display device is improved. For example, when it has a range of 75 ° to 77 ° with respect to the surface of the support layer, it was confirmed that the viewing angle is improved than before. In this case, the tilt angle value of the discotic liquid crystal contacting the second polarizing film may have a tilt angle value of 7 ° based on the first polarizing film.

하기 표 3은 지지층의 두께방향위상차값(Rth)의 변화에 다른 시야각 변화를 비교하는 표이다.Table 3 below is a table comparing the change in viewing angle different from the change in the thickness direction phase difference value Rth of the support layer.

지지층의 RthRth of the support layer 액정층의 △ndΔnd of the liquid crystal layer 시야각(좌/우/상/하)Viewing Angle (Left / Right / Up / Down) 비교예(기설정된값)Comparative Example (Preset Value) 80㎛80㎛ 409nm409nm 76/76/65/6176/76/65/61 실험예1Experimental Example 1 80㎛80㎛ 454nm454nm 64/64/64/5364/64/64/53 실험예2Experimental Example 2 100㎛100 μm 454nm454nm 75/75/78/6175/75/78/61 실험예3Experimental Example 3 120㎛120 μm 454nm454nm 80/80/80/8080/80/80/80 실험예4Experimental Example 4 140㎛140 μm 454nm454nm 71/71/71/8071/71/71/80

상기 표 3에서와 같이, 지지층의 두께방향위상차값(Rth)이 기설정된 값, 즉 80㎛보다 증가할 경우, 액정표시장치의 시야각이 개선되는 것을 확인할 수 있었다. 예컨대, 지지층의 두께방향위상차값(Rth)이 100㎛ 내지 140㎛의 범위를 가질 경우, 시야각이 종래보다 향상되는 것을 확인할 수 있었다.As shown in Table 3, when the thickness direction phase difference value (Rth) of the support layer increases more than a predetermined value, that is, 80㎛, it was confirmed that the viewing angle of the liquid crystal display device is improved. For example, when the thickness direction phase difference value Rth of the support layer has a range of 100 µm to 140 µm, it was confirmed that the viewing angle is improved than before.

이에 더하여, 시야각 보상층(300)을 액정표시패널(100)에 부착하며 제 2 편광필름(220)에 부착하기 위하여, 시야각 보상층(300)과 제 2 편광필름(220) 사이에 점착층(330)이 더 개재될 수 있다.In addition, in order to attach the viewing angle compensation layer 300 to the liquid crystal display panel 100 and to the second polarizing film 220, an adhesive layer between the viewing angle compensation layer 300 and the second polarizing film 220 may be used. 330 may be further interposed.

따라서, 본 발명의 실시예에서와 같이, 액정층의 굴절률 이방성(△n)과 액정층의 두께의 곱을 감소시키는 설계에 의해, 종래 셀갭 조절에 의한 상하부 전극의 쇼트불량 및 얼룩불량과 같은 불량이 발생하는 것을 방지하며 액정의 응답속도를 개선할 수 있다.Therefore, as in the embodiment of the present invention, by a design that reduces the product of the refractive index anisotropy (Δn) of the liquid crystal layer and the thickness of the liquid crystal layer, defects such as short defects and uneven defects of the upper and lower electrodes by conventional cell gap adjustment are eliminated. It can prevent the occurrence and improve the response speed of the liquid crystal.

또한, 본 발명의 실시예에 따른 액정표시장치는 디스코틱 액정층을 포함한 시야각 보상층의 채용으로 인해 액정층의 굴절률 이방성(△n)과 액정층의 두께의 곱을 감소시키는 설계로 인해 발생할 수 있는 협시야각 문제를 해소할 수 있다.
In addition, the liquid crystal display according to the embodiment of the present invention may be caused by the design of reducing the product of the refractive index anisotropy (Δn) of the liquid crystal layer and the thickness of the liquid crystal layer due to the adoption of the viewing angle compensation layer including the discotic liquid crystal layer Narrow-view angle problem can be solved.

100 : 액정표시패널
110 : 박막트랜지스터 기판
120 : 컬러필터 기판
130 : 액정층
210 : 제 1 편광필름
220 : 제 2 편광필름
300 : 시야각 보상층
310 : 지지층
320 : 디스코틱 액정층 100: liquid crystal display panel
110: thin film transistor substrate
120: color filter substrate
130: liquid crystal layer
210: first polarizing film
220: second polarizing film
300: viewing angle compensation layer
310: support layer
320: discotic liquid crystal layer

Claims (8)

컬러필터 기판과 박막트랜지스터 기판 및 상기 컬러 필터 기판과 상기 박막트랜지스터 기판 사이에 개재된 액정층을 구비하는 액정표시패널;
상기 액정표시패널의 일면에 배치된 제 1 편광필름;
상기 액정표시패널의 타면에 배치되며 상기 제 1 편광필름과 수직하게 교차하는 광투과축을 갖는 제 2 편광필름; 및
상기 액정표시패널과 상기 제 2 편광필름 사이에 개재된 시야각 보상층;
을 포함하며,
상기 액정층의 굴절률 이방성(△n)과 상기 액정층의 두께의 곱은 400 내지 500nm를 갖는 액정표시장치.
A liquid crystal display panel including a color filter substrate, a thin film transistor substrate, and a liquid crystal layer interposed between the color filter substrate and the thin film transistor substrate;
A first polarizing film disposed on one surface of the liquid crystal display panel;
A second polarizing film disposed on the other surface of the liquid crystal display panel and having a light transmission axis perpendicular to the first polarizing film; And
A viewing angle compensation layer interposed between the liquid crystal display panel and the second polarizing film;
/ RTI >
The product of the refractive index anisotropy (Δn) of the liquid crystal layer and the thickness of the liquid crystal layer has a 400 to 500nm.
제 1 항에 있어서,
상기 시야각 보상층은 지지층과 지지층상에 배치된 디스코틱 액정층을 포함하는 액정표시장치.
The method of claim 1,
The viewing angle compensation layer includes a support layer and a discotic liquid crystal layer disposed on the support layer.
제 2 항에 있어서,
상기 디스코틱 액정의 굴절률은 기설정된 값보다 감소시키는 액정표시장치.
The method of claim 2,
And a refractive index of the discotic liquid crystal is lower than a predetermined value.
제 3 항에 있어서,
상기 디스코틱 액정의 굴절률은 0.04811 내지 0.05311의 범위를 갖는 액정표시장치.
The method of claim 3, wherein
The refractive index of the discotic liquid crystal has a range of 0.04811 to 0.05311.
제 2 항에 있어서,
상기 디스코틱 액정의 틸트각은 기설정된 값보다 감소시키는 액정표시장치.
The method of claim 2,
And a tilt angle of the discotic liquid crystal is lower than a predetermined value.
제 5 항에 있어서,
상기 디스코틱 액정의 틸트각은 상기 지지층의 상면을 기준으로 75° 내지 77°의 범위를 갖는 액정표시장치.
The method of claim 5, wherein
The tilt angle of the discotic liquid crystal has a range of 75 ° to 77 ° with respect to the upper surface of the support layer.
제 2 항에 있어서,
상기 지지층의 두께방향위상차값(Rth)은 기설정된 값보다 감소시키는 액정표시장치.
The method of claim 2,
And a thickness direction phase difference value (Rth) of the support layer is lower than a predetermined value.
제 7 항에 있어서,
상기 지지층의 두께방향위상차값(Rth)은 100㎛ 내지 140㎛의 범위를 갖는 액정표시장치.The method of claim 7, wherein
The thickness direction phase difference value (Rth) of the support layer has a range of 100㎛ to 140㎛.
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KR20050074326A (en) * 2004-01-13 2005-07-18 세이코 엡슨 가부시키가이샤 Liquid crystal display device and projection display apparatus
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KR20050049132A (en) * 2003-11-21 2005-05-25 삼성전자주식회사 Wide-viewing angle plate, method of manufacturing the same and liquid crystal display device having the same
KR20050074326A (en) * 2004-01-13 2005-07-18 세이코 엡슨 가부시키가이샤 Liquid crystal display device and projection display apparatus
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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
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