KR100291988B1 - Liquid crystal display - Google Patents

Liquid crystal display Download PDF

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Publication number
KR100291988B1
KR100291988B1 KR1019930013209A KR930013209A KR100291988B1 KR 100291988 B1 KR100291988 B1 KR 100291988B1 KR 1019930013209 A KR1019930013209 A KR 1019930013209A KR 930013209 A KR930013209 A KR 930013209A KR 100291988 B1 KR100291988 B1 KR 100291988B1
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South Korea
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liquid crystal
film
crystal display
glass substrate
phase difference
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KR1019930013209A
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Korean (ko)
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KR950003881A (en
Inventor
김완수
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구본준
엘지.필립스엘시디주식회사
론 위라하디락사
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Priority to KR1019930013209A priority Critical patent/KR100291988B1/en
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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
    • 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
    • G02F1/1337—Surface-induced orientation of the liquid crystal molecules, e.g. by alignment layers
    • G02F1/133711—Surface-induced orientation of the liquid crystal molecules, e.g. by alignment layers by organic films, e.g. polymeric films
    • G02F1/133723—Polyimide, polyamide-imide
    • 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

Abstract

PURPOSE: An LCD(Liquid Crystal Display) is provided to enhance a photo reactivity depending on the voltage of a liquid crystal cell by extending a twist angle of a liquid crystal layer in a moderate range and to prevent the degradation of a contrast ratio depending on the increase of pixel number. CONSTITUTION: An upper phase difference film(110) having 7.8x0.001 of refractive index difference, 51 micrometer of thickness, and 85 degrees of optical axis angle is attached onto an upper polarizer(100) having 45 degrees of absorptive axis angle to restrain the excessive change of a contrast ratio. An upper glass substrate(101) is attached onto the upper phase difference film, and An indium tin oxide film(102) is layered onto the upper glass substrate in a specific thickness. A lower phase difference film(111) having 7.8x0.001 of refractive index difference, 6.229 micrometer of thickness, and 119 degrees of optical axis angle is attached onto a lower polarizer(104) having 71 degrees of absorptive axis angle. A lower glass substrate(105) is layered on the lower phase difference film, and a transparent conductive film(106) is layered on the lower glass substrate. The upper and lower phase difference films enhance a contrast ratio.

Description

액정표시소자LCD

제1도는 종래 액정표시소자의 단면도.1 is a cross-sectional view of a conventional liquid crystal display device.

제2도는 본 발명에 따른 액정표시소자의 단면도.2 is a cross-sectional view of a liquid crystal display device according to the present invention.

제3도는 본 발명에 적용되는 액정셀의 설계파라미터 및 특정치 설명도.3 is a diagram illustrating design parameters and specific values of a liquid crystal cell according to the present invention.

제4도는 본 발명 액정표시소자의 전기광학 특성도.4 is an electro-optical characteristic diagram of the liquid crystal display device of the present invention.

제5도는 본 발명 액정표시소자의 분광 스펙트럼도.5 is a spectral spectrum diagram of the liquid crystal display device of the present invention.

제6도는 본 발명에 따른 액정셀의 트위스트각과 응답시간 및 광반응성의 관계도.6 is a relationship between the twist angle, response time and photoreactivity of the liquid crystal cell according to the present invention.

제7도는 본 발명에 따른 광학 요소들의 파라미터값 설명도.7 is a parameter explanatory diagram of optical elements according to the invention.

* 도면의 주요부분에 대한 부호의 설명* Explanation of symbols for main parts of the drawings

100 : 상편광판 104 : 하편광판100: upper polarizing plate 104: lower polarizing plate

110 : 상위상차필름 111 : 하위상차필름110: upper upper film 111: lower upper film

본 발명은 액정표시소자에 관한 것으로, 특히 패시브 매트릭스 구동(PASSIVE MATREX DRIVING)용의 네마틱 액정표시소자(NEMATIC LIQUID CRYSTAL DISPLAY DEVICE)에 있어서 액정층의 트위스트 각도를 응답시간이 심각하게 늘지 않는 범위로 증가시켜 액정셀의 전압에 따른 광반응성(SHARPNESS)을 좋게 하여 액정표시소자의 화소수 증가에 따른 콘트라스트비의 저하를 해결하고자 한 액정표시소자에 관한 것이다.BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a liquid crystal display device. In particular, in the nematic liquid crystal display device for passive matrix driving, the twist angle of the liquid crystal layer is maintained in such a range that the response time does not significantly increase. The present invention relates to a liquid crystal display device which is intended to solve a decrease in contrast ratio due to an increase in the number of pixels of a liquid crystal display device by increasing SHARPNESS according to the voltage of the liquid crystal cell.

종래의 액정표시소자는 첨부한 도면 제1도에 도시된 바와 같이, 상판은 상편광판(100)상에 상부유리기판(101)을 적층하고, 상기 상부유리기판(101)상에 투명도전막(ITO막)(102)을 소정 두께로 적층한 후 에칭하여 선택적으로 형성한다.In the conventional liquid crystal display device, as shown in FIG. 1 of the accompanying drawings, the upper plate laminates the upper glass substrate 101 on the upper polarizing plate 100, and the transparent conductive film ITO on the upper glass substrate 101. Film) 102 is laminated to a predetermined thickness and then selectively formed by etching.

이후 상기 투명도전막(102) 상부와 상기 투명전도막(102)이 형성되지 않은 상부유리기판(101)상에 액정분자를 균일하게 배열할 수 있도록 PI가 주성분인 배향막(103)을 형성하여 상판을 제조한다.After that, the upper plate is formed by forming an alignment layer 103 including PI as a main component to uniformly arrange liquid crystal molecules on the transparent conductive film 102 and the upper glass substrate 101 on which the transparent conductive film 102 is not formed. Manufacture.

아울러 하판도 전술한 상판과 동일한 방법으로 하편광판(104) 상에 하부유리기판(105)을 적층하고, 상기 하부유리기판(105) 상에 투명도전막(ITO막)(106)을 소정 두께로 적층한 후 원하는 형태로 패터닝한다.In addition, the lower plate is further laminated with a lower glass substrate 105 on the lower polarizing plate 104 in the same manner as the upper plate, and a transparent conductive film (ITO film) 106 is laminated on the lower glass substrate 105 to a predetermined thickness. After that, pattern it as desired.

이후 상기 패턴된 투명도전막(106) 상과 상기 투명도전막(106)이 형성되지 않은 하부유리기판(105) 상에 액정분자를 균일하게 배열할 수 있도록 PI가 주성분인 배향막(107)을 형성하여 하판을 제조한다.Subsequently, an alignment layer 107 having PI as a main component is formed on the patterned transparent conductive layer 106 and on the lower glass substrate 105 on which the transparent conductive layer 106 is not formed. To prepare.

이후 상기와 같이 제조된 상판 및 하판을 합착공정으로 합착하여 액정층(108)을 형성한다.After that, the upper and lower plates manufactured as described above are bonded to each other to form a liquid crystal layer 108.

상기 합착시 상판과 하판의 일정거리 유지를 위해 그라스파이버라는 스페이서(109)를 액정층(108) 내에 뿌리게 되며, 액정층(108)에 액정을 주입한 후 외부로 액정이 누출되는 것을 방지하기 위해 액정층(108)의 양쪽 가장자리를 시일제로 봉합을 하여 액정표시소자를 제조하게 된다.The glass fiber is sprayed with a spacer 109 in the liquid crystal layer 108 in order to maintain a predetermined distance between the upper and lower plates when the bonding is performed, and after the liquid crystal is injected into the liquid crystal layer 108, the liquid crystal is prevented from leaking to the outside. In order to seal both edges of the liquid crystal layer 108 with a sealing agent, a liquid crystal display device is manufactured.

이와 같이 제조된 종래 액정표시소자는 트위스트각도를 90°로 하고 액정셀의 복굴절위상차는 0.5∼1.5μm로 하며, 액정셀의 배향방향과 나란히 편광필름을 부착시켜 흑백의 디스플레이를 만든다.The conventional liquid crystal display device manufactured as described above has a twist angle of 90 ° and a birefringence phase difference of the liquid crystal cell of 0.5 to 1.5 μm. The polarizing film is attached in parallel with the alignment direction of the liquid crystal cell to make a black and white display.

여기서 화소의 수가 증가하게 되면 패시브 매트릭스 구동시 원천적으로 선택전압과 비선택 전압의 비가 비슷해져 콘트라스트 비가 저하되는 문제점이 발생하게 된다.When the number of pixels is increased, a problem arises in that the ratio of the selection voltage and the non-selection voltage is similar to the source when the passive matrix is driven.

이를 해결하기 위해 종래에는 액정층의 트위스트 각도를 180°∼360°로 증가시키게 되는데, 이와 같이 지나치게 트위스트 각도를 증가시키게 되면 액정셀의 광응답시간이 늘어나 OA용 기기(적정응답시간=80ms)에 적용하는데 문제점이 있으며, 아울러 광응답시간을 감소시키기 위해 액정층의 두께를 5μm 이하로 형성시키는데 이는 두께 감소의 공정에 있어서 어려움을 초래한다.In order to solve this problem, conventionally, the twist angle of the liquid crystal layer is increased to 180 ° to 360 °. However, if the twist angle is excessively increased, the optical response time of the liquid crystal cell is increased, resulting in an OA device (suitable response time = 80 ms). There is a problem in application, and also in order to reduce the light response time, the thickness of the liquid crystal layer is formed to 5 μm or less, which causes a difficulty in the process of thickness reduction.

또한, 시야각에 따른 콘트라스트비의 큰 변화를 줄이기 위해 트위스트각이 90°이므로 액티브 매트릭스(ACTIVE MATRIX) 구동에는 적합하나, 패시브 매트릭스 구동에는 콘트라스트비의 저하를 방지할 수 없는 단점이 있었다.In addition, since the twist angle is 90 ° to reduce the large change in the contrast ratio according to the viewing angle, it is suitable for ACTIVE MATRIX driving, but there is a disadvantage in that the contrast matrix cannot be prevented from falling.

따라서 본 발명의 목적은 패시브 매트릭스 구동용의 네마틱 액정표시소자에 있어서 액정층의 트위스트 각도를 응답시간이 심각하게 늘지 않는 범위로 증가시켜 액정셀의 전압에 따른 광반응성을 향상시키고, 액정표시소자의 화소수 증가에 따른 콘트라스트비의 저하를 해결하도록 액정표시소자를 제공함에 있다.Accordingly, an object of the present invention is to increase the twist angle of the liquid crystal layer in a range in which the response time does not significantly increase in the nematic liquid crystal display device for passive matrix driving, thereby improving the photoreactivity according to the voltage of the liquid crystal cell, A liquid crystal display device is provided to solve a decrease in contrast ratio caused by an increase in the number of pixels.

제2도는 본 발명에 따른 액정표시소자의 단면도로써, 이하 본 발명을 첨부한 도면 제3도 내지 제7도를 참조하여 상세히 설명하면 다음과 같다.2 is a cross-sectional view of a liquid crystal display device according to the present invention. Hereinafter, the present invention will be described in detail with reference to FIGS. 3 to 7.

먼저, 제2도에 도시한 바와 같이 상판은 흡수축각도가 45°인 상편광판(100) 상에 시야각에 따른 콘트라스트비의 큰 변화를 줄이기 위해 굴절률차가 7.8×10-3, 두께 51μm, 광축각도가 85°인 상위상차필름(110)을 부착한다.First, as shown in FIG. 2, the top plate has a refractive index difference of 7.8 × 10 −3 , a thickness of 51 μm, and an optical axis angle on the upper polarizing plate 100 having an absorption axis angle of 45 ° to reduce a large change in contrast ratio according to the viewing angle. Attach the upper retardation film 110 is 85 °.

이후 상기 상위상차필름(110) 상에 상부유리기판(101)을 적층하고, 상기 상부유리기판(101) 상에 투명도전막(ITO막)(102)을 소정 두께로 적층한 후 에칭하여 선택적으로 형성한다.Thereafter, the upper glass substrate 101 is laminated on the upper difference film 110, and a transparent conductive film (ITO film) 102 is laminated on the upper glass substrate 101 to a predetermined thickness and then selectively formed by etching. do.

상기 투명도전막(102) 상부와 상기 투명도전막(102)이 형성되지 않은 상부유리기판(101) 상에 액정분자를 균일하게 배열할 수 있도록 PI가 주성분인 배향막(103)을 형성하여 상판을 제조한다.The top plate is formed by forming an alignment layer 103 including PI as a main component so that the liquid crystal molecules may be uniformly arranged on the upper surface of the transparent conductive film 102 and the upper glass substrate 101 on which the transparent conductive film 102 is not formed. .

아울러 하판은 흡수축 각도가 71°인 하편광판(104) 상에 굴절률차가 7.8×10-3이고, 두께가 6.229μm, 광축각도가 119°인 하위상차필름(111)을 부착한다.In addition, the lower plate attaches a lower retardation film 111 having a refractive index difference of 7.8 × 10 −3 , a thickness of 6.229 μm, and an optical axis angle of 119 ° on the lower polarizing plate 104 having an absorption axis angle of 71 °.

상기 하위상차필름(111) 상에는 하부유리기판(105)을 적층하고, 상기 하부유리기판(105) 상에는 투명도전막(106)을 소정 두께로 적층한 후 원하는 형태로 패터닝한다.The lower glass substrate 105 is laminated on the lower retardation film 111, and the transparent conductive film 106 is laminated on the lower glass substrate 105 to a predetermined thickness and then patterned.

이후 상기 패턴된 투명도전막(106)상과 상기 투명도전막(106)이 형성되지 않은 하부유리기판(105)상에 액정분자를 균일하게 배열할 수 있도록 PI가 주성분인 배향막(107)을 형성하여 하판을 제조한다.Subsequently, an alignment layer 107 having PI as a main component is formed on the patterned transparent conductive layer 106 and on the lower glass substrate 105 on which the transparent conductive layer 106 is not formed. To prepare.

이후 상기와 같이 제조한 상판 및 하판을 합착공정으로 합착하여 액정층(108)을 형성한다.Thereafter, the upper plate and the lower plate manufactured as described above are bonded to each other to form a liquid crystal layer 108.

상기 합착시 상판과 하판의 일정거리 유지를 위해 그라스파이버라는 스페이서(109)를 액정층(108)내에 뿌리게 되며, 액정층(108)에 액정을 주입한 후 외부로 액정이 누출되는 것을 방지하기 위해 액정층(108)의 양쪽 가장자리를 시일제로 봉합하여 액정표시소자를 제조한다.The glass fiber is sprayed with a spacer 109 in the liquid crystal layer 108 in order to maintain a predetermined distance between the upper and lower plates when the bonding is performed, and after the liquid crystal is injected into the liquid crystal layer 108, the liquid crystal is prevented from leaking to the outside. In order to seal both edges of the liquid crystal layer 108 with a sealing agent, a liquid crystal display device is manufactured.

이와 같이 상,하위상차필름을 부착시키므로써 콘트라스트비, 즉 비선택전압이 인가되었을 때의 광투과도와 선택전압이 인가되었을 때의 광투과도의 비는 제4도 및 제5도에서 보는 바와 같이 전기광학특성 및 분광스펙트럼 향상으로 높은 콘트라스트의 흑백디스플레이가 됨을 알 수 있다.By attaching the upper and lower phase difference films as described above, the contrast ratio, that is, the ratio of the light transmittance when the non-selective voltage is applied and the light transmittance when the selective voltage is applied is as shown in FIGS. 4 and 5. It can be seen that the black and white display of high contrast is achieved by improving the optical characteristics and spectral spectrum.

제7도는 본 발명의 실시예로서 트위스트 각도가 150°이고, 액정셀의 복굴절위상차가 1.0μm일 경우 각광학 요소의 파라미터(parameter) 값을 나타낸 것이다.FIG. 7 shows the parameter value of each optical element when the twist angle is 150 ° and the birefringence phase difference of the liquid crystal cell is 1.0 μm as an embodiment of the present invention.

이상에서 상세히 설명한 바와 같이 본 발명은 액정층의 트위스트 각도를 응답시간이 심각하게 늘지 않는 범위로 증가시킬 수 있기에 액정셀의 전압에 따른 광반응성을 향상시킬 수 있는 효과가 있으며, 상기의 효과에 의해 화소수 증가에 따른 콘트라스트비의 저하를 해결할 수 있는 효과가 있다.As described in detail above, the present invention can increase the twist angle of the liquid crystal layer to a range in which the response time does not increase significantly, thereby improving the photoreactivity according to the voltage of the liquid crystal cell. There is an effect that the degradation of the contrast ratio due to the increase in the number of pixels can be solved.

Claims (8)

상편광판, 상부유리기판, 제1투명도전막 및 제1배향막 순으로 형성된 상판과, 하편광판, 하부유리기판, 제2투명도전막 및 제2배향막 순으로 형성된 하판을 합착시켜 액정층을 형성하여 제조되는 액정표시소자에 있어서, 상기 상편광판과 상부유리기판 사이에 소정 두께를 갖고 형성되는 굴절율 차이가 7.8×10-3인 상위상차필름과; 상기 하편광판과 하부유리기판 사이에 소정 두께를 갖고 형성된 하위상차필름으로 구성된 것을 특징으로 하는 액정표시소자.The upper plate formed in the order of the upper polarizing plate, the upper glass substrate, the first transparent conductive film and the first alignment film and the lower plate formed in the order of the lower polarizing plate, the lower glass substrate, the second transparent conductive film and the second alignment film are formed to form a liquid crystal layer. A liquid crystal display device comprising: a higher phase difference film having a refractive index difference of 7.8 × 10 −3 formed between the upper polarizing plate and an upper glass substrate with a predetermined thickness; And a lower retardation film having a predetermined thickness between the lower polarizing plate and the lower glass substrate. 제1항에 있어서, 상기 상위상차필름은 두께가 51μm인 것을 특징으로 하는 액정표시소자.The liquid crystal display device of claim 1, wherein the upper difference film has a thickness of 51 μm. 제1항에 있어서, 상기 상위상차필름은 광축각도가 85인 것을 특징으로 하는 액정표시소자.The liquid crystal display device according to claim 1, wherein the upper difference film has an optical axis angle of 85 degrees. 제1항에 있어서, 상기 하위상차필름은 굴절률 차이가 7.8×10-3인 것을 특징으로 하는 액정표시소자.The liquid crystal display of claim 1, wherein the lower retardation film has a refractive index difference of 7.8 × 10 −3 . 제1항에 있어서, 상기 하위상차필름은 두께가 47μm인 것을 특징으로 하는 액정표시소자.The liquid crystal display device of claim 1, wherein the lower retardation film has a thickness of 47 μm. 제1항에 있어서, 상기 하위상차필름은 광축각도가 119인 것을 특징으로 하는 액정표시소자.The liquid crystal display of claim 1, wherein the lower retardation film has an optical axis angle of 119. 제1항에 있어서, 상기 액정층의 트위스트 각이 100도 내지 180도인 것을 특징으로 하는 액정표시소자.The liquid crystal display device according to claim 1, wherein the twist angle of the liquid crystal layer is 100 degrees to 180 degrees. 제1항에 있어서, 상기 액정층의 복굴절 위상차가 0.8∼2.0μm인 것을 특징으로 하는 액정표시소자.The liquid crystal display device according to claim 1, wherein the birefringence phase difference of the liquid crystal layer is 0.8 to 2.0 mu m.
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