KR20040026808A - Liquid crystal display and making the same - Google Patents
Liquid crystal display and making the same Download PDFInfo
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- KR20040026808A KR20040026808A KR1020020058402A KR20020058402A KR20040026808A KR 20040026808 A KR20040026808 A KR 20040026808A KR 1020020058402 A KR1020020058402 A KR 1020020058402A KR 20020058402 A KR20020058402 A KR 20020058402A KR 20040026808 A KR20040026808 A KR 20040026808A
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- 239000004973 liquid crystal related substance Substances 0.000 title claims abstract description 89
- 239000000758 substrate Substances 0.000 claims abstract description 86
- 238000000034 method Methods 0.000 claims abstract description 26
- 239000010409 thin film Substances 0.000 claims abstract description 8
- 230000000903 blocking effect Effects 0.000 claims description 4
- 238000000151 deposition Methods 0.000 claims description 4
- 239000011159 matrix material Substances 0.000 claims description 3
- 238000007789 sealing Methods 0.000 claims description 2
- 230000000694 effects Effects 0.000 abstract description 6
- 239000010408 film Substances 0.000 description 12
- 238000004519 manufacturing process Methods 0.000 description 6
- 230000005684 electric field Effects 0.000 description 5
- 125000006850 spacer group Chemical group 0.000 description 4
- 238000002347 injection Methods 0.000 description 3
- 239000007924 injection Substances 0.000 description 3
- 150000001875 compounds Chemical class 0.000 description 2
- 230000008021 deposition Effects 0.000 description 2
- 230000003287 optical effect Effects 0.000 description 2
- 238000000206 photolithography Methods 0.000 description 2
- 230000010287 polarization Effects 0.000 description 2
- 229920000642 polymer Polymers 0.000 description 2
- 230000005540 biological transmission Effects 0.000 description 1
- 230000008878 coupling Effects 0.000 description 1
- 238000010168 coupling process Methods 0.000 description 1
- 238000005859 coupling reaction Methods 0.000 description 1
- 238000009429 electrical wiring Methods 0.000 description 1
- 229910003437 indium oxide Inorganic materials 0.000 description 1
- PJXISJQVUVHSOJ-UHFFFAOYSA-N indium(iii) oxide Chemical compound [O-2].[O-2].[O-2].[In+3].[In+3] PJXISJQVUVHSOJ-UHFFFAOYSA-N 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000001259 photo etching Methods 0.000 description 1
- 238000005507 spraying Methods 0.000 description 1
- 238000004544 sputter deposition Methods 0.000 description 1
- XOLBLPGZBRYERU-UHFFFAOYSA-N tin dioxide Chemical compound O=[Sn]=O XOLBLPGZBRYERU-UHFFFAOYSA-N 0.000 description 1
- 229910001887 tin oxide Inorganic materials 0.000 description 1
- 238000007740 vapor deposition Methods 0.000 description 1
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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
- G02F1/13378—Surface-induced orientation of the liquid crystal molecules, e.g. by alignment layers by treatment of the surface, e.g. embossing, rubbing or light irradiation
- G02F1/133784—Surface-induced orientation of the liquid crystal molecules, e.g. by alignment layers by treatment of the surface, e.g. embossing, rubbing or light irradiation by rubbing
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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
- G02F1/1339—Gaskets; Spacers; Sealing of cells
- G02F1/13394—Gaskets; Spacers; Sealing of cells spacers regularly patterned on the cell subtrate, e.g. walls, pillars
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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
- G02F1/1341—Filling or closing of cells
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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
- G02F1/136—Liquid crystal cells structurally associated with a semi-conducting layer or substrate, e.g. cells forming part of an integrated circuit
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
- H01L29/00—Semiconductor devices specially adapted for rectifying, amplifying, oscillating or switching and having potential barriers; Capacitors or resistors having potential barriers, e.g. a PN-junction depletion layer or carrier concentration layer; Details of semiconductor bodies or of electrodes thereof ; Multistep manufacturing processes therefor
- H01L29/66—Types of semiconductor device ; Multistep manufacturing processes therefor
- H01L29/68—Types of semiconductor device ; Multistep manufacturing processes therefor controllable by only the electric current supplied, or only the electric potential applied, to an electrode which does not carry the current to be rectified, amplified or switched
- H01L29/76—Unipolar devices, e.g. field effect transistors
- H01L29/772—Field effect transistors
- H01L29/78—Field effect transistors with field effect produced by an insulated gate
- H01L29/786—Thin film transistors, i.e. transistors with a channel being at least partly a thin film
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- Physics & Mathematics (AREA)
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- General Physics & Mathematics (AREA)
- Mathematical Physics (AREA)
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- Microelectronics & Electronic Packaging (AREA)
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Abstract
Description
본 발명은 액정 디스플레이 및 그 제조방법에 관한 것으로, 액정 디스플레이를 구성하는 상부기판과 하부기판의 셀갭(Cell Gap)을 일정하게 유지하도록 하는 기둥(Pillar)과 픽셀전극이 드레인 전극에 접촉하도록 하는 컨텍홀(Contact Hole)을 러빙방향과 일직선상에 두어 액정 배향의 불균일 효과를 최소한으로 감소시켜 실제 개구율을 증가시키도록 하는 액정 디스플레이 및 그 제조방법에 관한 것이다.BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a liquid crystal display and a method of manufacturing the same, and includes a pillar and a pixel electrode contacting a drain electrode to maintain a constant cell gap between the upper substrate and the lower substrate constituting the liquid crystal display. The present invention relates to a liquid crystal display and a method of manufacturing the same, in which a hole is placed in a line with a rubbing direction to minimize the nonuniform effect of the liquid crystal alignment to increase the actual aperture ratio.
액정 디스플레이에 사용되는 액정은 광학적 이방성을 갖는 물질로 빛의 편광 상태 또는 편광의 진동방향을 변화시킬 수 있으며 전계의 영향에 따라 분자배열이 다르게 나타날 수 있다. 액정 디스플레이는 액정의 특성을 이용하여 디스플레이를 하며 액정 디스플레이의 상부기판과 하부기판에 편광판을 부착하여 상부기판에 부착된 편광판이 일정한 방향으로 진동하는 빛이 통과하도록 하고 액정의 광학적 이방성 성질을 이용하여 액정층에서 빛의 진동방향을 바꾸고 진동방향에 따라 하부기판에 부착된 편광판에서 빛을 투과 또는 차단하도록 한다. 액정층에서 빛의 진동방향은 전계에 의하여 액정의 배향되어 있는 방향을 변동시켜 특정한 방향으로 빛이 진동하도록 할 수 있다.Liquid crystal used in the liquid crystal display is a material having optical anisotropy can change the polarization state of the light or the vibration direction of the polarization and the molecular arrangement may appear differently depending on the influence of the electric field. A liquid crystal display displays a display using characteristics of a liquid crystal, and attaches a polarizing plate to an upper substrate and a lower substrate of the liquid crystal display so that light that vibrates in a predetermined direction passes through the polarizing plate attached to the upper substrate, and uses optical anisotropy property of the liquid crystal. The vibration direction of the light in the liquid crystal layer is changed and light is transmitted or blocked by the polarizer attached to the lower substrate according to the vibration direction. The vibration direction of the light in the liquid crystal layer may change the direction in which the liquid crystal is aligned by the electric field so that the light may vibrate in a specific direction.
상부기판에 부착된 편광판과 하부기판에 부착된 편광판은 제작자에 의사에 따라 동일한 방향으로 부착되어 상부기판에 부착된 편광판을 통과한 빛은 하부기판에 부착된 편광판을 통과할 수 있도록 할 수 있고, 또한, 서로 교차하는 방향으로 부착하여 상부기판에 부착된 편광판을 통과한 빛이 하부기판에 부착된 편광판을 통과할 수 없게 할 수 있다.The polarizer attached to the upper substrate and the polarizer attached to the lower substrate may be attached in the same direction according to the intention of the manufacturer so that light passing through the polarizer attached to the upper substrate may pass through the polarizer attached to the lower substrate. In addition, the light passing through the polarizing plate attached to the upper substrate may be prevented from passing through the polarizing plate attached to the lower substrate.
액정층의 액정을 배향시키도록 하기 위하여 상부기판과 하부기판의 상부전극과 픽셀전극의 상부에 배향막을 증착하고, 배향막에 의하여 일정한 방향으로 배향된 액정에 의하여 빛의 진동방향이 바뀌게 되어 상부기판에 부착된 편광판을 통과한 빛이 하부기판에 부착된 편광판에 의해 차단 또는 통과될 수 있도록 하여 디스플레이가 가능하도록 한다.In order to align the liquid crystal of the liquid crystal layer, an alignment film is deposited on the upper electrode and the pixel electrode of the upper substrate and the lower substrate, and the vibration direction of light is changed by the liquid crystal oriented in a predetermined direction by the alignment layer. The light passing through the attached polarizer may be blocked or passed by the polarizer attached to the lower substrate, thereby enabling display.
배향막에 의하여 일정한 방향으로 배향된 액정은 전계의 영향을 받아 배향막에 의하여 배향된 방향과 다른 방향으로 배향되도록 하여 픽셀전극을 이용하여 액정에 가한 전계를 이용하여 각 픽셀마다 빛의 투과 또는 차단을 제어하도록 하여 이미지를 디스플레이할 수 있도록 한다.Liquid crystals oriented in a certain direction by the alignment film are oriented in a direction different from the direction oriented by the alignment film under the influence of the electric field, and control the transmission or blocking of light for each pixel by using an electric field applied to the liquid crystal using the pixel electrode. So that the image can be displayed.
그리고, 상부기판과 하부기판 사이의 셀갭이 균일한 두께를 갖을 수 있도록기둥 등의 형태를 갖는 스페이서를 하부기판의 상부에 형성하여 액정층의 두께가 일정하여 액정 디스플레이의 어느 위치에서나 빛의 경로가 일정하게 유지되어 디스플레이를 하고자 하는 이미지의 왜곡을 방지하도록 한다.In addition, a spacer having a pillar shape or the like is formed on the upper portion of the lower substrate so that the cell gap between the upper substrate and the lower substrate has a uniform thickness so that the thickness of the liquid crystal layer is constant. It is kept constant so as to prevent distortion of the image to be displayed.
스페이서는 하부기판 상에 증착되어 있는 배향막의 상부에 고분자화합물을 증착하고 포토에칭공정을 통하여 기둥 형태의 스페이서가 형성되도록 한다. 그리고, 배향막에 러빙공정을 한다.The spacers deposit a polymer compound on the alignment layer deposited on the lower substrate and form a columnar spacer through a photoetching process. Then, a rubbing process is performed on the alignment film.
이러한 액정 디스플레이는 디스플레이되는 이미지가 더욱선명하고 밝게 표시될 수 있도록 픽셀의 크기를 줄이고 픽셀의 수가 많아지도록 하며 더욱 밝게 표시하도록 하기 위하여 개구율이 높은 액정 디스플레이를 제작한다.Such a liquid crystal display manufactures a liquid crystal display having a high aperture ratio in order to reduce the size of pixels, increase the number of pixels, and display brighter images so that the displayed image can be displayed more clearly and brightly.
하지만, 액정 디스플레이의 하부기판의 배향막에 러빙공정을 하는 과정에서 스페이서에 의해 배향막의 일부분에 러빙공정이 가해지지 않게 되는 영역이 형성되어 러빙공정이 가해지지 않게된 영역에 액정 불균일 효과가 나타나게 되어 전계가 변하여도 빛이 투과되지 않게 되어 액정 디스플레이를 통과하는 빛의 양이 줄어들게 되어 실질적으로 액정 디스플레이의 개구율이 떨어지는 문제점이 발생한다.However, during the rubbing process on the alignment layer of the lower substrate of the liquid crystal display, a region in which the rubbing process is not applied to a portion of the alignment layer is formed by the spacer, and the liquid crystal non-uniform effect appears in the region where the rubbing process is not applied. Although the light is not transmitted, the amount of light passing through the liquid crystal display is reduced, thereby causing a problem that the aperture ratio of the liquid crystal display is substantially lowered.
따라서, 본 발명은 상기 종래 기술의 문제점을 해결하기 위하여 창출된 것으로, 본 발명의 목적은 셀갭을 유지하도록 하는 기둥에 의하여 배향막의 러빙공정이 이루어지지 않게 되어 액정 배향 불균일 현상이 나타나게 되는 영역이 픽셀부분에 나타나지 않게 하여 실질적으로 개구율을 높이도록 하는 액정 디스플레이 및 그 제조방법에 관한 것이다.Therefore, the present invention was created in order to solve the problems of the prior art, and an object of the present invention is that the rubbing process of the alignment layer is not performed by the pillar to maintain the cell gap so that the liquid crystal alignment unevenness occurs in the pixel. The present invention relates to a liquid crystal display and a method of manufacturing the same so as not to appear in portions to substantially increase the aperture ratio.
상기 목적을 달성하기 위하여 본 발명에 따른 액정 디스플레이는, 일정한 셀갭을 유지하며 결합되어 있는 상부기판과 하부기판사이에 액정이 주입되며 상기 액정의 배열이 배향막에 의해 일정한 방향으로 배향되어 있도록 하고, 상기 하부기판 상에 상기 액정의 배향에 변화를 주는 픽셀전극과 상기 픽셀전극과 컨텍홀을 통해서 전기적으로 연결되는 스위칭 소자를 구비하는 액정 디스플레이에 있어서,In order to achieve the above object, the liquid crystal display according to the present invention maintains a constant cell gap, and a liquid crystal is injected between the upper substrate and the lower substrate, and the arrangement of the liquid crystal is aligned in a predetermined direction by an alignment layer. A liquid crystal display comprising a pixel electrode for changing the orientation of the liquid crystal on a lower substrate and a switching element electrically connected to the pixel electrode through a contact hole.
액정 디스플레이의 광차단영역에 위치하며 셀갭을 유지하도록 하는 기둥; 배향막을 러빙공정하는 방향을 기준으로 하여 기둥의 위치와 컨텍홀의 위치가 동일한 선상에 위치하는 것을 특징으로 하고,A pillar positioned in the light blocking region of the liquid crystal display to maintain a cell gap; The position of the pillar and the position of the contact hole are located on the same line with respect to the direction in which the alignment layer is rubbed,
또한, 상기 목적을 달성하기 위하여 본 발명에 따른 액정 디스플레이 제조방법은, 데이터선과 주사선 및 스위칭 소자가 배선되어 있는 하부기판에 픽셀전극을 매트릭스 형태로 형성하며 상기 픽셀전극이 컨텍홀을 통하여 스위칭 소자와 전기적으로 연결되도록 구성되는 하부기판을 형성하고, 픽셀전극에 대향되는 대향전극이 형성되어 있는 상부기판을 형성하는 제 1단계; 하부기판 상에 데이터선과 주사선이 배선되어 있으며 컨텍홀과 러빙방향과 일직선상에 위치하는 곳에 셀갭을 유지하도록 하는 기둥을 형성하는 제 2단계; 상부기판과 하부기판에 배향막을 증착하는 제 3단계; 상부기판과 하부기판의 배향막에 러빙공정을 하는 제 4단계; 및 상부기판과 하부기판을 결합한 후에 외곽부를 봉인을 하며 상부기판과 하부기판의 사이에 액정을 주입하는 제 5단계로 구성되는 것을 특징으로 한다.In addition, in order to achieve the above object, a liquid crystal display manufacturing method according to the present invention comprises forming a pixel electrode in a matrix form on a lower substrate on which data lines, scanning lines, and switching elements are wired, and the pixel electrodes are connected to the switching elements through contact holes. Forming a lower substrate configured to be electrically connected to each other, and forming an upper substrate on which an opposite electrode facing the pixel electrode is formed; A second step of forming a pillar to keep the cell gap where the data line and the scan line are wired on the lower substrate, and the cell gap is located in a line with the contact hole and the rubbing direction; Depositing an alignment layer on the upper substrate and the lower substrate; A fourth step of performing a rubbing process on the alignment layers of the upper substrate and the lower substrate; And a fifth step of sealing the outer portion after coupling the upper substrate and the lower substrate and injecting the liquid crystal between the upper substrate and the lower substrate.
도 1은 본 발명에 따른 액정 디스플레이의 하부기판의 평면도를 나타내는 도이다.1 is a plan view of a lower substrate of a liquid crystal display according to the present invention.
도 2는 본 발명에 따른 액정 디스플레이의 제조공정을 나타내는 순서도이다.2 is a flowchart illustrating a manufacturing process of a liquid crystal display according to the present invention.
본 발명은 첨부한 도면을 참조하면서, 종래의 기술과 비교하여, 하기의 설명으로부터 좀더 명확하게 이해될 것이다.The present invention will be more clearly understood from the following description, in comparison with the prior art, with reference to the accompanying drawings.
도 1은 본 발명에 따른 액정 디스플레이의 하부기판의 평면도를 나타내는 도이다. 도 1을 참조하여 설명하면,1 is a plan view of a lower substrate of a liquid crystal display according to the present invention. Referring to Figure 1,
액정 디스플레이는 투명한 상부기판과 하부기판과 액정층으로 구성되며 상부기판과 하부기판 사이는 일정한 셀갭이 유지된다.The liquid crystal display is composed of a transparent upper substrate, a lower substrate and a liquid crystal layer, and a constant cell gap is maintained between the upper substrate and the lower substrate.
하부기판(10)에는 픽셀전극(11)이 매트릭스의 형태로 배열되어 있으며, 픽셀전극(11)의 상부에 액정 디스플레이의 셀갭을 유지할 수 있도록 기둥(12)을 형성하고 배향막을 증착한다. 그리고, 상부기판에는 픽셀전극(10)과 대향하는 대향전극이 형성되고 대향전극의 상부에 배향막이 증착된다. 배향막은 액정이 상부기판과 하부기판(10) 사이에서 일정한 방향으로 배향되어 있도록 한다.Pixel electrodes 11 are arranged in a matrix form on the lower substrate 10, and pillars 12 are formed on the pixel electrodes 11 so as to maintain a cell gap of the liquid crystal display, and an alignment layer is deposited. In addition, an opposite electrode facing the pixel electrode 10 is formed on the upper substrate, and an alignment layer is deposited on the opposite electrode. The alignment layer allows the liquid crystal to be aligned in a predetermined direction between the upper substrate and the lower substrate 10.
픽셀전극(11)은 박막트랜지스터의 드레인 전극과 컨텍홀(13)을 통해 연결되며 드레인 전극을 통하여 데이터 입력신호를 전송받아 액정에 전계의 변화를 가하여 배향되어 있는 액정의 분자배열을 변화시켜 액정이 빛을 차단 또는 투과할 수 있도록 한다. 그리고, 픽셀전극(11)은 액정디스플레이의 하부기판(10)에 형성되어 있는 박막트랜지스터의 드레인 전극과 연결되도록 픽셀전극(11)에서 드레인 전극까지 연결되는 컨텍홀(13)이 형성되어 드레인 전극과 픽셀전극(11)이 컨텍홀(13)을 통해 연결된다.The pixel electrode 11 is connected through the drain electrode and the contact hole 13 of the thin film transistor, and receives a data input signal through the drain electrode to change the molecular arrangement of the liquid crystal oriented by changing the electric field of the liquid crystal to the liquid crystal Make it possible to block or transmit light. The pixel electrode 11 is formed with a contact hole 13 connected from the pixel electrode 11 to the drain electrode so as to be connected to the drain electrode of the thin film transistor formed on the lower substrate 10 of the liquid crystal display. The pixel electrode 11 is connected through the contact hole 13.
픽셀전극(11)과 대향전극은 빛이 투과되는 투명전극으로 형성된다. 하지만, 박막트랜지스터 또는 기타 전기 배선은 빛이 투과되지 못하는 불투명한 성질을 가지고 있어 픽셀전극(11)의 일부분이 불투명한 영역의 상부에 형성되고 불투명한 영역과 겹치는 곳에 컨텍홀(13)이 형성된다.The pixel electrode 11 and the counter electrode are formed of transparent electrodes through which light is transmitted. However, the thin film transistor or other electrical wiring has an opaque property in which light cannot be transmitted, so that the contact hole 13 is formed where a portion of the pixel electrode 11 is formed on the opaque region and overlaps with the opaque region. .
액정 디스플레이의 하부기판(10)에는 셀갭이 일정하게 유지하기 위해 형성된 기둥(12)은 상부기판과 하부기판(10) 사이에 주입된 액정에 의하여 형성되는 액정층이 균일한 두께를 가지고 있어, 액정층에 도달한 빛이 액정 디스플레이의 어느 위치에서도 동일한 경로를 가질 수 있도록 하여 디스플레이되는 이미지가 왜곡되는것을 방지하도록 한다. 또한, 기둥(12)은 액정 디스플레이 상에서 빛이 투과되지 않게 되는 영역에 형성되어 빛이 픽셀을 통과하는 과정에서 기둥에 의해 빛이 차단되는 것을 방지한다.The pillar 12 formed in the lower substrate 10 of the liquid crystal display to maintain a constant cell gap has a uniform thickness of the liquid crystal layer formed by the liquid crystal injected between the upper substrate and the lower substrate 10, The light reaching the layer can have the same path at any position of the liquid crystal display to prevent the displayed image from being distorted. In addition, the pillar 12 is formed in a region where light is not transmitted on the liquid crystal display to prevent the light from being blocked by the pillar in the course of the light passing through the pixel.
그리고, 기둥(12)에 의해 배향막을 증착한 후에 배향막의 상부에 배향막에 러빙 공정을 하는 과정에서 기둥(12)에 의해 러빙 공정이 이루어지지 않아 액정 배향 불균일 영역(14)이 발생한다. 기둥(12)에 의해 배향막에 가해지는 러빙공정이 액정의 배향이 이루어지지 않게 되는 액정 배향 불균일 영역(14)이 발생하면 액정 배향 불균일 영역(14)에 위치하는 액정의 배향이 이루어지지 않게 되어 액정 배향 불균일 영역(14) 내에서 빛의 차단 또는 투과가 제대로 이루어지지 않게 된다. 이러한 액정 배향 불균일 영역(14)이 픽셀에 형성되면 편광판을 통과한 빛이 액정에 의해 차단 또는 투과가 이루어지지 않게 되어 디스플레이에 문제가 생기게 된다.After the deposition of the alignment film by the pillars 12, the rubbing process is not performed by the pillars 12 in the process of performing a rubbing process on the alignment film on the alignment film, thereby generating a liquid crystal alignment uneven region 14. When the rubbing process applied to the alignment film by the pillar 12 causes the liquid crystal alignment non-uniformity region 14 in which the alignment of the liquid crystal does not occur, the alignment of the liquid crystal positioned in the liquid crystal alignment non-uniformity region 14 is not achieved. In the orientation non-uniformity region 14, the light is not blocked or transmitted properly. When the liquid crystal alignment non-uniformity region 14 is formed in the pixel, the light passing through the polarizing plate is not blocked or transmitted by the liquid crystal, which causes a problem in the display.
따라서, 이러한 문제점을 방지하기 위하여 기둥(12)의 위치를 배선상에 위치하도록 하며 박막트랜지스터의 드레인전극과 픽셀전극(11)이 접촉하도록 하는 러빙공정을 하는 방향을 기준으로 하여 컨텍홀(13)이 형성되는 곳과 동일선상에 위치하도록 하여 기둥(12)에 의하여 액정 배향이 이루어지지 않는 영역이 컨텍홀(13)의 위치에 생기도록 하여 픽셀에 위치하는 액정의 배향에는 문제가 발생하지 않도록 한다. 컨텍홀(13)은 액정 디스플레이의 데이터선 또는 주사선과 같이 빛이 통과하지 않게 되는 영역에 형성되어 액정 배향이 이루어지지 않는 영역이 불투명 층에 형성되어 액정에 의해 빛이 투과 또는 차단되는 것에 아무런 영향을 끼치지 않도록 한다.Therefore, in order to prevent such a problem, the contact hole 13 is positioned on the basis of the rubbing process in which the position of the pillar 12 is positioned on the wiring and the drain electrode and the pixel electrode 11 of the thin film transistor are in contact with each other. This is to be located on the same line as the formed place so that a region in which the liquid crystal alignment is not performed by the pillar 12 occurs at the position of the contact hole 13 so that a problem does not occur in the alignment of the liquid crystal located in the pixel. . The contact hole 13 is formed in an area where light does not pass, such as a data line or a scanning line of the liquid crystal display, so that an area in which the liquid crystal is not aligned is formed in the opaque layer so that light is not transmitted or blocked by the liquid crystal. Do not disturb.
도 2는 본 발명에 따른 액정 디스플레이의 제조공정을 나타내는 순서도이다. 도 2를 참조하여 설명하면,2 is a flowchart illustrating a manufacturing process of a liquid crystal display according to the present invention. Referring to Figure 2,
제 1단계(ST 100): 투명한 하부기판의 상부에 포토리소그래피공정을 이용하여 데이터배선, 주사선 및 스위칭 소자로 사용되어 데이터베선을 통해 입력되는 신호를 주사선을 통해 입력된 신호에 의해 제어하도록 하는 박막트랜지스터 등을 형성하고 박막 트랜지스터와 전기적으로 연결되는 픽셀전극을 형성한다. 또한, 투명한 상부기판의 상부에 픽셀전극에 대향되는 대향전극을 형성한다. 픽셀전극과 대향전극은 산화주석, 산화인듐 또는 그들의 혼합물을 상부기판과 하부기판 상에 스프레이, 증착 또는 스퍼터 방법으로 형성한다.First step (ST 100): A thin film which is used as a data wiring, a scanning line and a switching element by using a photolithography process on an upper portion of a transparent lower substrate to control a signal input through a data wire by a signal input through a scanning line. A transistor or the like is formed and a pixel electrode electrically connected to the thin film transistor is formed. In addition, an opposing electrode facing the pixel electrode is formed on the transparent upper substrate. The pixel electrode and the counter electrode form tin oxide, indium oxide or a mixture thereof on the upper substrate and the lower substrate by spraying, vapor deposition or sputtering.
제 2단계(ST 110): 하부기판에는 셀갭을 유지하기 위하여 복수 개의 기둥을 형성한다. 기둥의 위치는 액정 디스플레이에서 빛이 통과되지 않는 불투명 영역에형성하며 러빙방향을 기준으로 컨텍홀과 일치하는 방향에 위치하도록 한다. 기둥은 픽세런극이 형성되어 있는 하부기판의 상부에 고분자화합물을 증착하고 포토리소그라피공정을 통하여 지정된 위치에 기둥이 형성되도록 한다.Second Step ST 110: A plurality of pillars are formed on the lower substrate to maintain a cell gap. The position of the pillar is formed in an opaque region where light does not pass in the liquid crystal display, and is positioned in a direction coinciding with the contact hole with respect to the rubbing direction. The pillar deposits a polymer compound on the upper part of the lower substrate on which the pixel electrode is formed and allows the pillar to be formed at a designated position through a photolithography process.
제 3단계(ST 120): 투명한 상부기판과 하부기판 상에 액정이 주입되면 일정한 방향으로 배향되도록 하는 배향막을 증착한다.Third Step (ST 120): When the liquid crystal is injected onto the transparent upper substrate and the lower substrate is deposited an alignment film to be oriented in a predetermined direction.
제 4단계(ST 130): 상부기판과 하부기판에 러빙공정을 하고 상부기판과 하부기판의 외곽부를 실(Seal)을 이용하여 봉인하여 결합한다. 하부기판 상에 복수 개의 기둥이 있어 상부기판과 하부기판은 일정한 셀갭을 유지하게 된다. 그리고, 액정이 상부기판과 하부기판의 사이에 주입될 수 있도록 액정 주입구를 형성한다.Step 4 (ST 130): A rubbing process is performed on the upper substrate and the lower substrate, and the outer portions of the upper substrate and the lower substrate are sealed by using a seal. There are a plurality of pillars on the lower substrate so that the upper substrate and the lower substrate maintain a constant cell gap. Then, the liquid crystal injection hole is formed so that the liquid crystal can be injected between the upper substrate and the lower substrate.
기둥을 형성한 후에 배향막을 증착하고 러빙공정을 하는 이유는 배향막 증착과 러빙공정을 먼저 하게 되면, 기둥과 배향막간에 밀착성이 떨어져 기둥이 쉽게 떨어져 나가게 되며 또한, 기둥이 붙어 있는 상태에서 러빙공정을 하게 되면 러빙공정시에 배향막에 가해지는 힘에 의해 기둥이 떨어져 나가게 되기 때문이다.After forming the pillars, the alignment film is deposited and the rubbing process is performed. If the alignment film deposition and rubbing process are performed first, the adhesion between the pillars and the alignment film is poor and the pillars easily come off, and the rubbing process is performed while the pillars are attached. This is because the pillars fall off due to the force applied to the alignment layer during the rubbing process.
제 5단계(ST 140): 액정 주입구를 통하여 액정을 주입을 하면 배향막에 의해 액정이 배향된다. 액정의 주입은 상부기판과 하부기판 내의 셀갭의 기압을 감압하여 외부와의 압력의 차이에 의하여 액정이 주입될 수 있도록 한다. 액정의 주입이 완료되면 액정주입구는 실을 이용하여 봉인을 한다.Fifth Step (ST 140): When the liquid crystal is injected through the liquid crystal injection hole, the liquid crystal is aligned by the alignment layer. Injecting the liquid crystal reduces the pressure of the cell gap in the upper substrate and the lower substrate so that the liquid crystal can be injected by the pressure difference from the outside. When the injection of the liquid crystal is completed, the liquid crystal inlet is sealed using a seal.
액정 디스플레이는 액정을 배향시키는 배향막에 가해지는 러빙공정이 셀갭을유지하기 위한 기둥에 의해 배향막의 일부분에 가해지지 못하게 되어 액정 배향의 불균일 효과가 나타나는 영역이 생기는 문제점이 발생하는데, 본 발명에 따른 액정 디스플레이에 의하면 액정 배향의 불균일 효과가 나타나는 영역을 줄이고 또한 액정 배향의 불균일 효과가 나타나는 영역이 픽셀에 형성되는 것을 방지하여 픽셀을 통과하는 빛의 양이 줄어드는 것을 방지하여 액정 디스플레이의 개구율을 높여 디스플레이를 하는 이미지가 밝게 나타나게 되어 디스플레이의 품격을 높일 수 있도록 한다.In the liquid crystal display, the rubbing process applied to the alignment layer for orienting the liquid crystal cannot be applied to a part of the alignment layer by the pillar for maintaining the cell gap, thereby causing a problem in which a region in which a non-uniform effect of the liquid crystal alignment occurs is generated. According to the display, the area in which the nonuniform effect of the liquid crystal alignment is exhibited is reduced, and the area in which the nonuniform effect of the liquid crystal alignment is exhibited is prevented from being formed in the pixel, thereby preventing the amount of light passing through the pixel from being reduced, thereby increasing the aperture ratio of the liquid crystal display. The image will appear brighter to enhance the display's quality.
본 발명의 바람직한 실시례가 특정 용어들을 사용하여 기술되어 왔지만, 그러한 기술은 오로지 설명을 하기 위한 것이며, 다음의 청구범위의 기술적 사상 및 범위로부터 이탈되지 않고서 여러 가지 변경 및 변화가 가해질 수 있는 것으로 이해 되어져야 한다.While the preferred embodiments of the present invention have been described using specific terms, such descriptions are for illustrative purposes only, and it is understood that various changes and modifications may be made without departing from the spirit and scope of the following claims. Should be done.
Claims (6)
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| KR1020020058402A KR20040026808A (en) | 2002-09-26 | 2002-09-26 | Liquid crystal display and making the same |
| AU2003263650A AU2003263650A1 (en) | 2002-09-24 | 2003-09-24 | Liquid crystal display and manufacturing method thereof |
| PCT/KR2003/001946 WO2004029921A2 (en) | 2002-09-24 | 2003-09-24 | Liquid crystal display and manufacturing method thereof |
| TW92126297A TW200405106A (en) | 2002-09-24 | 2003-09-24 | Liquid crystal display and manufacturing method thereof |
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| KR100675635B1 (en) * | 2004-05-10 | 2007-02-02 | 엘지.필립스 엘시디 주식회사 | In plane switching mode liquid crystal display device having improved contrast ratio |
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| JPH06175133A (en) * | 1992-12-10 | 1994-06-24 | Seiko Epson Corp | Production of liquid crystal display element |
| JPH1184386A (en) * | 1997-09-01 | 1999-03-26 | Toshiba Corp | Active matrix type liquid crystal display device |
| JPH11295718A (en) * | 1998-04-13 | 1999-10-29 | Casio Comput Co Ltd | Panel for liquid crystal display |
| KR20000039271A (en) * | 1998-12-11 | 2000-07-05 | 구본준 | Liquid crystal display |
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| JPH06175133A (en) * | 1992-12-10 | 1994-06-24 | Seiko Epson Corp | Production of liquid crystal display element |
| JPH1184386A (en) * | 1997-09-01 | 1999-03-26 | Toshiba Corp | Active matrix type liquid crystal display device |
| JPH11295718A (en) * | 1998-04-13 | 1999-10-29 | Casio Comput Co Ltd | Panel for liquid crystal display |
| KR20000039271A (en) * | 1998-12-11 | 2000-07-05 | 구본준 | Liquid crystal display |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| KR100675635B1 (en) * | 2004-05-10 | 2007-02-02 | 엘지.필립스 엘시디 주식회사 | In plane switching mode liquid crystal display device having improved contrast ratio |
| US7535533B2 (en) | 2004-05-10 | 2009-05-19 | Lg. Display Co., Ltd | Plane switching mode liquid crystal display device having improved contrast ratio |
| US7911577B2 (en) | 2004-05-10 | 2011-03-22 | Lg Display Co., Ltd. | Plane switching mode liquid crystal display device having improved contrast ratio |
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