KR20130060697A - Liquid crystal display panel and manufactucring method of the same - Google Patents

Liquid crystal display panel and manufactucring method of the same Download PDF

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KR20130060697A
KR20130060697A KR1020110126896A KR20110126896A KR20130060697A KR 20130060697 A KR20130060697 A KR 20130060697A KR 1020110126896 A KR1020110126896 A KR 1020110126896A KR 20110126896 A KR20110126896 A KR 20110126896A KR 20130060697 A KR20130060697 A KR 20130060697A
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substrate
alignment layer
electrodes
liquid crystal
crystal display
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KR101888436B1 (en
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전현숙
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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
    • G02F1/1337—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
    • G02F1/1337—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
    • G02F1/133—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
    • G02F1/134363—Electrodes characterised by their geometrical arrangement for applying an electric field parallel to the substrate, i.e. in-plane switching [IPS]
    • 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
    • G02F1/13439—Electrodes characterised by their electrical, optical, physical properties; materials therefor; method of making
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08G—MACROMOLECULAR COMPOUNDS OBTAINED OTHERWISE THAN BY REACTIONS ONLY INVOLVING UNSATURATED CARBON-TO-CARBON BONDS
    • C08G73/00—Macromolecular compounds obtained by reactions forming a linkage containing nitrogen with or without oxygen or carbon in the main chain of the macromolecule, not provided for in groups C08G12/00 - C08G71/00
    • C08G73/06—Polycondensates having nitrogen-containing heterocyclic rings in the main chain of the macromolecule
    • C08G73/10—Polyimides; Polyester-imides; Polyamide-imides; Polyamide acids or similar polyimide precursors
    • 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
    • G02F1/134372—Electrodes characterised by their geometrical arrangement for fringe field switching [FFS] where the common electrode is not patterned

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  • Physics & Mathematics (AREA)
  • Nonlinear Science (AREA)
  • Mathematical Physics (AREA)
  • Chemical & Material Sciences (AREA)
  • Crystallography & Structural Chemistry (AREA)
  • General Physics & Mathematics (AREA)
  • Optics & Photonics (AREA)
  • Spectroscopy & Molecular Physics (AREA)
  • Liquid Crystal (AREA)
  • Geometry (AREA)

Abstract

PURPOSE: A liquid crystal display panel and a method for manufacturing the same are provided to prevent a display error such as the afterimage of a screen when the liquid crystal display panel is used for long periods of time. CONSTITUTION: An upper alignment layer(112) is formed on an upper substrate(111). A lower alignment layer(102) is formed on a lower substrate(101) facing the upper substrate. Electrodes(104,106) are formed on one of the upper and the lower substrate. An alignment layer having no electrode on the substrate has a high voltage holding ratio compared to the alignment layer having the electrodes.

Description

액정 표시 패널 및 그 제조 방법{LIQUID CRYSTAL DISPLAY PANEL AND MANUFACTUCRING METHOD OF THE SAME}Liquid crystal display panel and its manufacturing method {LIQUID CRYSTAL DISPLAY PANEL AND MANUFACTUCRING METHOD OF THE SAME}

본 발명은 액정 표시 패널 및 그 제조 방법에 관한 것으로, 특히 잔상 및 신뢰성을 향상시킬 수 있는 액정 표시 패널 및 그 제조 방법에 관한 것이다. BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a liquid crystal display panel and a method for manufacturing the same, and more particularly, to a liquid crystal display panel and a method for manufacturing the same which can improve afterimage and reliability.

액정 표시 소자(Liquid Crystal Display, LCD)는 박막 트랜지스터(TFT) 기판과 컬러 필터 기판 사이에 주입되어 있는 이방성 유전율을 갖는 액정층에 전계를 인가하고, 이 전계의 세기를 조절하여 기판에 투과되는 광의 양을 조절함으로써 원하는 화상 신호를 얻는 표시 장치이다.A liquid crystal display (LCD) applies an electric field to a liquid crystal layer having an anisotropic dielectric constant injected between a thin film transistor (TFT) substrate and a color filter substrate, and controls the intensity of the electric field to adjust the intensity of light transmitted through the substrate. It is a display device that obtains a desired image signal by adjusting the amount.

이러한 종래 액정 표시 소자는 액정층의 배향을 조절하기 위해 액정층을 사이에 두고 대면하는 상부배향막 및 하부 배향막을 구비한다. 종래 상부 배향막 및 하부 배향막은 동일 재질로 형성됨으로써 동일한 특성을 가지게 된다. 이에 따라, 상부 배향막 및 하부 배향막을 잔상이 우수한 배향막으로 형성하면, 액정 표시 패널의 신뢰성 특성이 좋지 않다. 그리고, 상부 배향막 및 하부 배향막을 신뢰성이 우수한 배향막으로 형성하면, 액정 표시 패널의 잔상특성이 좋지 않다. 따라서,최근에는 신뢰성 및 잔상이 우수한 액정 표시 패널이 요구되고 있다.The conventional liquid crystal display device includes an upper alignment layer and a lower alignment layer facing each other with the liquid crystal layer interposed therebetween to adjust the alignment of the liquid crystal layer. Conventionally, the upper alignment layer and the lower alignment layer are formed of the same material to have the same characteristics. Accordingly, when the upper alignment film and the lower alignment film are formed of an alignment film having excellent afterimage, the reliability characteristics of the liquid crystal display panel are not good. When the upper alignment layer and the lower alignment layer are formed of an alignment film having excellent reliability, the afterimage characteristic of the liquid crystal display panel is not good. Therefore, recently, the liquid crystal display panel which is excellent in reliability and an afterimage is calculated | required.

본 발명은 상기 문제점을 해결하기 위해, 잔상 및 신뢰성을 향상시킬 수 있는 액정 표시 패널 및 그 제조 방법을 제공하는 것이다. The present invention is to provide a liquid crystal display panel and a method of manufacturing the same that can improve the afterimage and reliability to solve the above problems.

상기 목적을 달성하기 위하여, 본 발명에 따른 액정 표시 패널은 상부기판 상에 형성되는 상부 배향막과; 상기 상부기판과 대향하는 하부 기판 상에 형성되는 하부 배향막과; 상기 상부 기판 및 하부 기판 중 어느 한 기판 상에 형성되는 전극들을 구비하며, 상기 전극들이 형성된 기판 상의 배향막은 직류 전압에 의해 축적되는 잔류 전하의 완화의 속도가 상기 전극들이 형성되지 않은 기판 상의 배향막보다 빠르며, 상기 전극들이 형성되지 않은 기판 상의 배향막은 상기 전극들이 형성된 기판 상의 배향막보다 전압 유지율이 높은 것을 특징으로 한다.In order to achieve the above object, the liquid crystal display panel according to the present invention includes an upper alignment layer formed on the upper substrate; A lower alignment layer formed on the lower substrate facing the upper substrate; Electrodes formed on one of the upper substrate and the lower substrate, wherein an alignment film on the substrate on which the electrodes are formed has a rate of relaxation of residual charge accumulated by a direct current voltage than an alignment film on a substrate on which the electrodes are not formed. It is fast, and the alignment layer on the substrate on which the electrodes are not formed has a higher voltage retention than the alignment layer on the substrate on which the electrodes are formed.

상기 전극들은 상기 하부 기판 상에 수평 전계 또는 프린지 전계를 형성하는 화소 전극 및 공통 전극을 구비하는 것을 특징으로 한다.The electrodes may include a pixel electrode and a common electrode forming a horizontal electric field or a fringe electric field on the lower substrate.

상기 상부 배향막은 상기 하부 배향막보다 이미드화율이 높으며, 상기 하부 배향막은 상기 상부 배향막보다 전기 저항이 낮은 것을 특징으로 한다.The upper alignment layer has a higher imidation ratio than the lower alignment layer, and the lower alignment layer has lower electrical resistance than the upper alignment layer.

상기 기술적 과제를 달성하기 위하여, 본 발명에 따른 액정 표시 패널의 제조 방법은 상부 기판과, 상기 상부 기판과 대향하는 하부 기판 중 어느 한 기판 상에 전극들을 형성하는 단계와; 상기 상부기판 상에 상부 배향막을 형성하는 단계와; 상기 하부 기판 상에 하부 배향막을 형성하는 단계와; 상기 상부 배향막이 형성된 상부 기판과 상기 하부 배향막이 형성된 하부 기판을 합착하는 단계를 포함하며, 상기 전극들이 형성된 기판 상의 배향막은 직류 전압에 의해 축적되는 잔류 전하의 완화의 속도가 상기 전극들이 형성되지 않은 기판 상의 배향막보다 빠르며, 상기 전극들이 형성되지 않은 기판 상의 배향막은 상기 전극들이 형성된 기판 상의 배향막보다 전압 유지율이 높은 것을 특징으로 한다.In order to achieve the above technical problem, a method of manufacturing a liquid crystal display panel according to the present invention comprises the steps of forming electrodes on any one of the upper substrate, the lower substrate facing the upper substrate; Forming an upper alignment layer on the upper substrate; Forming a lower alignment layer on the lower substrate; And bonding the upper substrate on which the upper alignment layer is formed and the lower substrate on which the lower alignment layer is formed, wherein the alignment layer on the substrate on which the electrodes are formed has a rate of relaxation of residual charge accumulated by a direct current voltage. It is faster than an alignment film on a substrate, and the alignment film on the substrate on which the electrodes are not formed has a higher voltage retention than the alignment film on the substrate on which the electrodes are formed.

상기 전극들을 형성하는 단계는 상기 하부 기판 상에 수평 전계 또는 프린지 전계를 형성하는 화소 전극 및 공통 전극을 형성하는 단계를 포함하는 것을 특징으로 한다.The forming of the electrodes may include forming a pixel electrode and a common electrode forming a horizontal electric field or a fringe electric field on the lower substrate.

본 발명에 따른 액정 표시 패널은 전극들이 형성되는 하부 기판 상에 상부 배향막보다 잔상이 우수한 하부 배향막을 형성하며, 전극들이 형성되지 않은 상부 기판 상에 하부 배향막보다 신뢰성이 우수한 상부 배향막을 형성한다. 이에 따라, 본 발명은 신뢰성을 향상시킬 수 있을 뿐만 아니라 잔상도 개선할 수 있다.The liquid crystal display panel according to the present invention forms a lower alignment layer having a better afterimage than an upper alignment layer on the lower substrate on which the electrodes are formed, and forms an upper alignment layer having more reliability than the lower alignment layer on the upper substrate on which the electrodes are not formed. Accordingly, the present invention can not only improve the reliability but also improve the afterimage.

도 1은 본 발명에 따른 액정 표시 패널을 나타내는 단면도이다.
도 2는 도 1에 도시된 상부 배향막과 하부 배향막의 잔류 전하의 완화 속도를 설명하기 위한 도면이다.
도 3은 도 1에 도시된 본 발명에 따른 액정 표시 패널과 비교예들의 잔상 특성을 설명하기 위한 도면이다.
도 4는 도 1에 도시된 상부 배향막과 하부 배향막의 전압 유지비를 설명하기 위한 도면이다.
도 5는 도 1에 도시된 본 발명에 따른 액정 표시 패널과 비교예의 신뢰성 특성을 설명하기 위한 도면이다.
도 6은 도 1에 도시된 액정 표시 패널의 제조 방법을 설명하기 위한 흐름도이다.1 is a cross-sectional view showing a liquid crystal display panel according to the present invention.
FIG. 2 is a diagram for describing a relaxation rate of residual charge of the upper alignment layer and the lower alignment layer illustrated in FIG. 1.
FIG. 3 is a view for explaining an afterimage characteristic of a liquid crystal display panel and comparative examples according to the present invention shown in FIG. 1.
FIG. 4 is a diagram for describing a voltage retention ratio between the upper alignment layer and the lower alignment layer illustrated in FIG. 1.
5 is a view for explaining the reliability characteristics of the liquid crystal display panel and the comparative example according to the present invention shown in FIG.
6 is a flowchart for describing a method of manufacturing the liquid crystal display panel illustrated in FIG. 1.

이하, 첨부된 도면을 참조하여 본 발명에 따른 실시 예를 상세하게 설명한다. Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings.

도 1은 본 발명에 따른 액정 표시 패널은 액정층(120)과, 그 액정층(120)을 사이에 두고 대향하는 박막트랜지스터 기판(100) 및 컬러 필터 기판(110)을 구비한다.1 shows a liquid crystal display panel according to the present invention, which includes a liquid crystal layer 120 and a thin film transistor substrate 100 and a color filter substrate 110 facing each other with the liquid crystal layer 120 interposed therebetween.

컬러 필터 기판(110)은 상부 기판(111) 상에 형성되며 컬러 구현을 위한 컬러 필터와, 빛샘 방지를 위한 블랙매트릭스와, 그들 위에 도포된 상부 배향막(112)으로 이루어진다.The color filter substrate 110 is formed on the upper substrate 111 and includes a color filter for implementing color, a black matrix for preventing light leakage, and an upper alignment layer 112 applied thereon.

박막트랜지스터 기판(100)은 하부 기판(101) 상에 서로 교차되게 형성된 게이트 라인 및 데이터 라인과, 게이트 라인 및 데이터 라인의 교차부에 형성된 박막트랜지스터와, 박막트랜지스터와 접속된 화소 전극(104)과, 화소 전극(104)을 덮도록 형성된 절연막(108) 상에 형성되며 화소 전극(104)과 프린지 전계를 형성하는 공통 전극(106)과, 그들 위에 액정 배향을 위해 도포되며 상부 배향막(112)과 다른 재질로 형성된 하부 배향막(102)으로 이루어진다.The thin film transistor substrate 100 includes a gate line and a data line intersecting each other on the lower substrate 101, a thin film transistor formed at an intersection of the gate line and the data line, a pixel electrode 104 connected to the thin film transistor, And a common electrode 106 formed on the insulating film 108 formed to cover the pixel electrode 104 and forming a fringe electric field with the pixel electrode 104. The lower alignment layer 102 is formed of another material.

하부 배향막(102)은 상부 배향막(112)보다 잔상이 우수한 폴리이미드(Polyimide) 또는 폴리아믹산(Polyamic acid)로 형성되거나 이들의 조합으로 형성된다. 즉, 하부 배향막(102)은 상부 배향막(112)보다 전기 저항이 낮아 도 2에 도시된 바와 같이 직류 전압에 의해 축적되는 잔류 전하의 완화 속도가 상부 배향막(112)보다 빠르다. The lower alignment layer 102 is formed of polyimide or polyamic acid having a better afterimage than the upper alignment layer 112, or a combination thereof. That is, the lower alignment layer 102 has a lower electrical resistance than the upper alignment layer 112, and as shown in FIG. 2, the relaxation rate of the residual charge accumulated by the DC voltage is faster than the upper alignment layer 112.

구체적으로, 표 1 및 도 3에 도시된 바와 같이 하부 배향막(102)으로 저잔상 배향막을 이용하고, 상부 배향막(112)으로 고신뢰성 배향막을 이용한 본 발명에 따른 액정 표시 패널을 2시간 구동하고 잔상을 측정한 결과, 잔류 전하의 완화속도가 빨라 약 15분 후 잔상이 없어진다. Specifically, as shown in Table 1 and FIG. 3, the liquid crystal display panel according to the present invention is driven for 2 hours using a low afterimage alignment layer as the lower alignment layer 102 and a high reliability alignment layer as the upper alignment layer 112. As a result of the measurement, the relaxation rate of the residual charge is fast and afterimage disappears after about 15 minutes.

반면에, 하부 배향막으로 고신뢰성 배향막을 이용하고, 상부 배향막으로 저잔상 배향막을 이용한 비교예 1의 액정 표시 패널을 2시간 구동한 후 잔상을 측정한 결과, 30분이 경과한 후에도 잔상이 남아 있다. 또한, 하부 배향막 및 상부 배향막으로 고신뢰성 배향막을 이용한 비교예2 의 액정 패널을 2시간 구동한 후 잔상을 측정한 결과, 30분이 경과한 후에도 높은 레벨의 잔상이 남아 있다.On the other hand, after driving the liquid crystal display panel of Comparative Example 1 using the high reliability alignment film as the lower alignment film and the low afterimage alignment film as the upper alignment film for 2 hours, afterimages were measured. As a result, afterimages remain after 30 minutes. In addition, after driving the liquid crystal panel of Comparative Example 2 using the highly reliable alignment film as the lower alignment film and the upper alignment film for 2 hours, the afterimage was measured. As a result, a high level of afterimage remained after 30 minutes.

하부배향막/상부배향막Lower alignment layer / upper alignment layer 2sec2sec 5min5min 10min10 min 15min15 min 20min20min 30min30min 실시예Example 저잔상배향막/고신뢰성배향막Low persistence alignment layer / high reliability alignment layer 55 55 1One 00 00 00 비교예1Comparative Example 1 고신뢰성배향막/저잔상배향막High Reliability Oriented Film / Low Residual Oriented Film 55 55 33 22 22 22 비교예2Comparative Example 2 고신뢰성배향막/고신뢰성배향막High Reliability Orientation Film / High Reliability Orientation Film 55 55 55 55 55 55

이에 따라, 하부 배향막(102)으로 저잔상 배향막을 이용하고, 상부 배향막(112)으로 고신뢰성 배향막을 이용한 본 발명의 액정 표시 패널은 장시간 사용하여도 화면의 잔상과 같은 표시 불량을 억제할 수 있다.Accordingly, the liquid crystal display panel of the present invention using the low afterimage alignment layer as the lower alignment layer 102 and the high reliability alignment layer as the upper alignment layer 112 can suppress display defects such as afterimages on the screen even when used for a long time. .

상부 배향막(112)은 하부 배향막(102)보다 신뢰성이 우수한 폴리이미드(Polyimide) 또는 폴리아믹산(Polyamic acid)로 형성되거나 이들의 조합으로 형성된다. 즉, 상부 배향막(112)은 하부 배향막(102)보다 이미드화율이 높은 재질로 형성됨으로써 도 4에 도시된 바와 같이 상부 배향막(112)은 하부 배향막(102)보다 전압 유지비(Voltage Holding Ratio)가 높아져 신뢰성이 향상된다.The upper alignment layer 112 is formed of polyimide or polyamic acid, which is more reliable than the lower alignment layer 102, or a combination thereof. That is, since the upper alignment layer 112 is formed of a material having a higher imidization ratio than the lower alignment layer 102, as shown in FIG. 4, the upper alignment layer 112 has a voltage holding ratio greater than that of the lower alignment layer 102. Higher reliability is improved.

구체적으로, 도 5에 도시된 바와 같이 상부 및 하부 배향막으로 저잔상 배향막을 이용한 비교예의 액정 표시 패널은 신뢰성을 측정하는 요고레 특성 검사결과 약 700시간 이후 선잔상이 발생된다. 반면에 하부 배향막(102)으로 저잔상 배향막을 이용하고, 상부 배향막(112)으로 고신뢰성 배향막을 이용한 본 발명의 액정 표시 패널은 요고레 특성 검사 결과 약 800시간 이후에도 잔상이 발생되지 않아 비교예에 비해 신뢰성이 우수함을 알 수 있다.Specifically, as shown in FIG. 5, in the liquid crystal display panel of the Comparative Example using the low afterimage alignment layer as the upper and lower alignment layers, afterimage exposure occurs after about 700 hours. On the other hand, the liquid crystal display panel of the present invention using the low afterimage alignment layer as the lower alignment layer 102 and the high reliability alignment layer as the upper alignment layer 112 has no residual image after about 800 hours as a result of the Yogore characteristic test. It can be seen that the reliability is excellent.

도 6은 본 발명에 따른 액정 표시 소자의 제조 방법을 설명하기 위한 흐름도이다.6 is a flowchart illustrating a method of manufacturing a liquid crystal display device according to the present invention.

먼저, 도 6에 도시된 바와 같이 컬러 필터 및 블랙매트릭스 등이 형성된 상부 기판(111) 상에 상부 배향막(112)이 인쇄됨과 동시에 박막트랜지스터, 화소 전극(104) 및 공통 전극(106)이 형성된 하부 기판(101) 상에 하부 배향막(102)이 인쇄된다. 이 때, 상부 배향막(112)은 하부 배향막(102)보다 신뢰성이 우수한 폴리이미드(Polyimide) 또는 폴리아믹산(Polyamic acid)로 형성되거나 이들의 조합으로 형성된다. 그리고, 하부 배향막(102)은 상부 배향막(112)보다 잔상이 우수한 폴리이미드(Polyimide) 또는 폴리아믹산(Polyamic acid)로 형성되거나 이들의 조합으로 형성된다. First, as shown in FIG. 6, the upper alignment layer 112 is printed on the upper substrate 111 on which the color filter, the black matrix, and the like are formed, and at the same time, the lower layer on which the thin film transistor, the pixel electrode 104, and the common electrode 106 are formed. The lower alignment layer 102 is printed on the substrate 101. In this case, the upper alignment layer 112 is formed of polyimide or polyamic acid, which is more reliable than the lower alignment layer 102, or a combination thereof. The lower alignment layer 102 may be formed of polyimide or polyamic acid having a better afterimage than the upper alignment layer 112, or a combination thereof.

그런 다음, 상부 배향막(112) 및 하부 배향막(102) 각각이 소성 및 러빙된다. Then, each of the upper alignment layer 112 and the lower alignment layer 102 is baked and rubbed.

그런 다음, 상부 배향막(112)이 형성된 상부 기판(111)과, 세정된 하부 배향막(102)이 형성된 하부 기판(101)은 액정(120)을 사이에 두고 합착됨으로써 액정 표시 소자가 완성된다.Then, the upper substrate 111 on which the upper alignment layer 112 is formed and the lower substrate 101 on which the cleaned lower alignment layer 102 are bonded are bonded together with the liquid crystal 120 interposed therebetween, thereby completing the liquid crystal display device.

한편, 본 발명은 프린지 전계형 액정 표시 패널을 예로 들어 설명하였지만, 이외에도 수평 전계형 액정 표시 패널에도 적용가능하다.On the other hand, the present invention has been described using a fringe field type liquid crystal display panel as an example, but can also be applied to a horizontal field type liquid crystal display panel.

이상의 설명은 본 발명을 예시적으로 설명한 것에 불과하며, 본 발명이 속하는 기술 분야에서 통상의 지식을 가진 자에 의해 본 발명의 기술적 사상에서 벗어나지 않는 범위에서 다양한 변형이 가능할 것이다. 따라서 본 발명의 명세서에 개시된 실시 예들은 본 발명을 한정하는 것이 아니다. 본 발명의 범위는 아래의 특허청구범위에 의해 해석되어야 하며, 그와 균등한 범위 내에 있는 모든 기술도 본 발명의 범위에 포함되는 것으로 해석해야 할 것이다.The foregoing description is merely illustrative of the present invention, and various modifications may be made by those skilled in the art without departing from the spirit of the present invention. Accordingly, the embodiments disclosed in the specification of the present invention are not intended to limit the present invention. The scope of the present invention should be construed according to the following claims, and all the techniques within the scope of equivalents should be construed as being included in the scope of the present invention.

100 : 박막트랜지스터 기판 101,111 : 기판
102,112: 배향막 104 : 화소 전극
106 : 공통 전극 110 : 컬러 필터 기판
120 : 액정100: thin film transistor substrate 101,111: substrate
102, 112: alignment film 104: pixel electrode
106: common electrode 110: color filter substrate
120: liquid crystal

Claims (6)

상부기판 상에 형성되는 상부 배향막과;
상기 상부기판과 대향하는 하부 기판 상에 형성되는 하부 배향막과;
상기 상부 기판 및 하부 기판 중 어느 한 기판 상에 형성되는 전극들을 구비하며,
상기 전극들이 형성된 기판 상의 배향막은 직류 전압에 의해 축적되는 잔류 전하의 완화의 속도가 상기 전극들이 형성되지 않은 기판 상의 배향막보다 빠르며, 상기 전극들이 형성되지 않은 기판 상의 배향막은 상기 전극들이 형성된 기판 상의 배향막보다 전압 유지율이 높은 것을 특징으로 하는 액정 표시 패널.An upper alignment layer formed on the upper substrate;
A lower alignment layer formed on the lower substrate facing the upper substrate;
Electrodes formed on any one of the upper substrate and the lower substrate,
The alignment film on the substrate on which the electrodes are formed has a faster rate of relaxation of residual charge accumulated by the DC voltage than the alignment film on the substrate on which the electrodes are not formed, and the alignment film on the substrate on which the electrodes are not formed is an alignment film on the substrate on which the electrodes are formed. The voltage retention is higher than that of the liquid crystal display panel. 제 1 항에 있어서,
상기 전극들은 상기 하부 기판 상에 수평 전계 또는 프린지 전계를 형성하는 화소 전극 및 공통 전극을 구비하는 것을 특징으로 하는 액정 표시 패널.The method of claim 1,
The electrodes may include a pixel electrode and a common electrode forming a horizontal electric field or a fringe electric field on the lower substrate. 제 2 항에 있어서,
상기 상부 배향막은 상기 하부 배향막보다 이미드화율이 높으며, 상기 하부 배향막은 상기 상부 배향막보다 전기 저항이 낮은 것을 특징으로 하는 액정 표시 패널.3. The method of claim 2,
The upper alignment layer has a higher imidation ratio than the lower alignment layer, and the lower alignment layer has a lower electrical resistance than the upper alignment layer. 상부 기판과, 상기 상부 기판과 대향하는 하부 기판 중 어느 한 기판 상에 전극들을 형성하는 단계와;
상기 상부기판 상에 상부 배향막을 형성하는 단계와;
상기 하부 기판 상에 하부 배향막을 형성하는 단계와;
상기 상부 배향막이 형성된 상부 기판과 상기 하부 배향막이 형성된 하부 기판을 합착하는 단계를 포함하며,
상기 전극들이 형성된 기판 상의 배향막은 직류 전압에 의해 축적되는 잔류 전하의 완화의 속도가 상기 전극들이 형성되지 않은 기판 상의 배향막보다 빠르며, 상기 전극들이 형성되지 않은 기판 상의 배향막은 상기 전극들이 형성된 기판 상의 배향막보다 전압 유지율이 높은 것을 특징으로 하는 액정 표시 패널의 제조 방법.Forming electrodes on one of an upper substrate and a lower substrate opposite the upper substrate;
Forming an upper alignment layer on the upper substrate;
Forming a lower alignment layer on the lower substrate;
Bonding the upper substrate on which the upper alignment layer is formed and the lower substrate on which the lower alignment layer is formed;
The alignment film on the substrate on which the electrodes are formed has a faster rate of relaxation of residual charge accumulated by the DC voltage than the alignment film on the substrate on which the electrodes are not formed, and the alignment film on the substrate on which the electrodes are not formed is an alignment film on the substrate on which the electrodes are formed. The voltage retention is higher than that, The manufacturing method of the liquid crystal display panel characterized by the above-mentioned. 제 4 항에 있어서,
상기 전극들을 형성하는 단계는
상기 하부 기판 상에 수평 전계 또는 프린지 전계를 형성하는 화소 전극 및 공통 전극을 형성하는 단계를 포함하는 것을 특징으로 하는 액정 표시 패널의 제조 방법.The method of claim 4, wherein
Forming the electrodes
And forming a pixel electrode and a common electrode forming a horizontal electric field or a fringe electric field on the lower substrate. 제 5 항에 있어서,
상기 상부 배향막은 상기 하부 배향막보다 이미드화율이 높으며, 상기 하부 배향막은 상기 상부 배향막보다 전기 저항이 낮은 것을 특징으로 하는 액정 표시 패널의 제조 방법.The method of claim 5, wherein
The upper alignment layer has a higher imidation ratio than the lower alignment layer, and the lower alignment layer has a lower electrical resistance than the upper alignment layer.
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