KR20080095665A - Liquid crystal display - Google Patents

Liquid crystal display Download PDF

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Publication number
KR20080095665A
KR20080095665A KR1020070040456A KR20070040456A KR20080095665A KR 20080095665 A KR20080095665 A KR 20080095665A KR 1020070040456 A KR1020070040456 A KR 1020070040456A KR 20070040456 A KR20070040456 A KR 20070040456A KR 20080095665 A KR20080095665 A KR 20080095665A
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KR
South Korea
Prior art keywords
alignment layer
liquid crystal
substrate
layer
alignment
Prior art date
Application number
KR1020070040456A
Other languages
Korean (ko)
Inventor
배성환
Original Assignee
삼성전자주식회사
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by 삼성전자주식회사 filed Critical 삼성전자주식회사
Priority to KR1020070040456A priority Critical patent/KR20080095665A/en
Publication of KR20080095665A publication Critical patent/KR20080095665A/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
    • G02F1/1337—Surface-induced orientation of the liquid crystal molecules, e.g. by alignment layers
    • 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
    • G02F1/133707—Structures for producing distorted electric fields, e.g. bumps, protrusions, recesses, slits in pixel electrodes
    • 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
    • G02F1/1341—Filling or closing of 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
    • 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
    • G02F1/1345—Conductors connecting electrodes to cell terminals

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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)

Abstract

An LCD is provided to prevent smudge on liquid crystal by preventing unhardened sealing material from being diffused to the active area. A first substrate and a second substrate are arranged to face each other. A liquid crystal layer(300) is formed between the first substrate and the second substrate, and is sealed up. A lower first alignment layer(11a) is formed on the part in which the artificial electric field of the first substrate is formed. A lower second alignment layer(11b) is formed on between the lower first alignment layer and sealing material. An upper first alignment layer(21a) is formed on the part in which the artificial electric field of the second substrate is formed.

Description

Liquid crystal display {LIQUID CRYSTAL DISPLAY}

1 is a diagram illustrating a liquid crystal display according to an exemplary embodiment of the present invention.

FIG. 2 is a cross-sectional view of the liquid crystal display shown in FIG. 1 taken along line II-II. FIG.

<Explanation of symbols for the main parts of the drawings>

11a: lower first alignment layer 11b: lower second alignment layer

21a: upper first alignment layer 21b: upper second alignment layer

100: lower display panel 124: gate electrode

151: semiconductor 173: source electrode

175: drain electrode 180: protective film

191: pixel electrode 200: upper display panel

220: light blocking member 230: color filter

300: liquid crystal layer 310: sealing material

The present invention relates to a liquid crystal display device.

The liquid crystal display is one of the most widely used flat panel display devices, and includes two display panels on which an electric field generating electrode such as a pixel electrode and a common electrode are formed, and a liquid crystal layer interposed therebetween. The liquid crystal display generates an electric field in the liquid crystal layer by applying a voltage to the field generating electrode, thereby determining an orientation of liquid crystal molecules in the liquid crystal layer and controlling the polarization of incident light to display an image.

Among them, the vertical alignment mode liquid crystal display in which the long axis of the liquid crystal molecules are arranged perpendicular to the upper and lower display panels without an electric field applied to the display panel has a high contrast ratio and is easy to implement a wide viewing angle.

The two display panels of the liquid crystal display device are joined by a sealing material formed around the edge. The sealing material prevents the liquid crystal between the two display panels of the liquid crystal display from leaking, and is generally in direct contact with the liquid crystal.

Such a sealant is cured by heat treatment or ultraviolet rays to prevent the sealant from reacting with the liquid crystal material. However, there is a problem that the uncured sealant component diffuses into an active area to which an artificial electric field is applied and reacts with the liquid crystal material to cause staining.

An object of the present invention is to provide a liquid crystal display device capable of preventing the uncured sealing material from being diffused into the active region.

In order to solve this problem, the present invention proposes a liquid crystal display in which a second alignment layer is formed on each of two display panels of the liquid crystal display.

The liquid crystal display according to the exemplary embodiment of the present invention is formed between a first substrate and a second substrate facing each other, a liquid crystal layer sandwiched between the first and second substrates, a first substrate and a second substrate, The sealing material enclosing the layer, the lower first alignment film formed in the portion where the artificial electric field of the first substrate is formed, the lower second alignment film formed between the lower first alignment film and the sealing material, and the artificial electric field of the second substrate And an upper first alignment film formed in a portion to be formed, and an upper second alignment film formed between the upper first alignment film and the sealing material.

The lower first alignment layer, the lower second alignment layer, the upper first alignment layer, and the upper second alignment layer may be made of polyimide.

The lower first alignment layer, the lower second alignment layer, the upper first alignment layer, and the upper second alignment layer may vertically align the liquid crystal of the liquid crystal layer with respect to the first substrate.

The display device may further include a plurality of pixel electrodes formed on the first substrate and a common electrode formed on the second substrate, and the lower second alignment layer may be disposed at a position outside the region where the plurality of pixel electrodes are formed.

The upper second alignment layer may be disposed outside the region where the common electrode is formed.

DETAILED DESCRIPTION Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings so that those skilled in the art may easily implement the present invention. As those skilled in the art would realize, the described embodiments may be modified in various different ways, all without departing from the spirit or scope of the present invention.

In the drawings, the thickness of layers, films, panels, regions, etc., are exaggerated for clarity. Like parts are designated by like reference numerals throughout the specification. When a part of a layer, film, region, plate, etc. is said to be "on" another part, this includes not only the other part being "right over" but also another part in the middle. On the contrary, when a part is "just above" another part, there is no other part in the middle.

1 is a diagram illustrating a liquid crystal display according to an exemplary embodiment of the present invention, and FIG. 2 is a cross-sectional view taken along the line II-II of the liquid crystal display of FIG. 1.

In the liquid crystal display according to the present exemplary embodiment, the lower panel 100 and the upper panel 200 facing each other are bonded by a sealing material 310 formed along the circumference of the active region A to which an artificial electric field is applied. And a liquid crystal layer 300 interposed therebetween. Here, there is a portion in which no artificial electric field is applied between the active region A and the sealant 310.

First, the lower panel 100 will be described in detail.

A plurality of gate electrodes 124 are formed on the insulating substrate 110 made of transparent glass or the like.

A gate insulating layer 140 made of an insulating material is formed on the gate electrode 124, and a plurality of semiconductors 151 are formed on the gate insulating layer 140.

A plurality of ohmic contacts 163 and 165 are formed on the semiconductor 151. The ohmic contacts 163 and 165 are paired and disposed on the semiconductor 151.

A plurality of source electrodes 173 and a plurality of drain electrodes 175 are formed on the ohmic contacts 163 and 165.

The gate electrode 124, the source electrode 173, and the drain electrode 175 form a thin film transistor (TFT) together with the semiconductor 151, and a channel of the thin film transistor is connected to the source electrode 173. It is formed in the semiconductor 151 between the drain electrode 175.

The ohmic contacts 163 and 165 exist only between the semiconductor 151 at the bottom thereof and the data line and the drain electrode 175 thereon, and serve to lower the contact resistance.

A passivation layer 180 is formed on the source electrode 173, the drain electrode 175, and the semiconductor 151.

A plurality of pixel electrodes 191 is formed on the passivation layer 180.

The pixel electrode 191 is physically and electrically connected to the drain electrode 175 through the contact hole 185 to receive a data voltage from the drain electrode 175.

The pixel electrode 191 to which the data voltage is applied generates an electric field together with the common electrode 270 of the upper panel 200 to determine the arrangement of liquid crystal molecules of the liquid crystal layer 300 between the two electrodes.

In addition, each pixel electrode 191 and the common electrode 270 form a liquid crystal capacitor to maintain an applied voltage even after the thin film transistor is turned off, and expand the voltage holding capability by providing a storage capacitor connected in parallel with the liquid crystal capacitor. do.

The lower first alignment layer 11a and the lower second alignment layer 11b are formed on the pixel electrode 191 and the passivation layer 180 by applying a polymer film such as polyimide. The lower first alignment layer 11a and the lower second alignment layer 11b vertically align the liquid crystal molecules of the liquid crystal layer 300. One or both of the first alignment layer 11a and the lower second alignment layer 11b may be rubbed in a predetermined direction.

The lower first alignment layer 11a is formed on the active region A of the lower panel 100, and the lower second alignment layer 11b is applied with an artificial electric field between the lower first alignment layer 11a and the sealing material 310. It is formed in the part which is not. That is, the lower second alignment layer 11b is disposed outside the region where the pixel electrode 191 is formed.

Next, the upper panel 200 will be described.

A light blocking member 220 called a black matrix for preventing light leakage is formed on an insulating substrate 210 made of transparent glass or the like. The light blocking member 220 has a plurality of openings having substantially the same shape as the pixel area.

A plurality of color filters 230 is also formed on the substrate 210. The color filter 230 is positioned in most of the area surrounded by the light blocking member 220, and may extend in the vertical direction along the pixel area. The color filter 230 may display one of primary colors such as red, green, and blue.

An overcoat 250 is formed on the color filter 230 and the light blocking member 220 to prevent the color filter 230 from being exposed and to provide a flat surface. In this case, the overcoat 250 may be omitted.

The common electrode 270 formed of a transparent conductor such as ITO or IZO is formed on the overcoat 250.

A polyimide polymer film is coated on the common electrode 270 to form the upper first alignment layer 21a and the upper second alignment layer 21b. The upper first alignment layer 21a and the upper second alignment layer 11b vertically align the liquid crystal molecules of the liquid crystal layer 300. One or both of the upper first alignment layer 21a and the upper second alignment layer 11b may be rubbed in a predetermined direction.

The upper first alignment layer 21a is formed on the active region A, and the upper second alignment layer 21b is formed at a portion where no artificial electric field is applied between the upper first alignment layer 21a and the sealing material 310. have. As such, the common electrode 270 may be removed from the portion where the upper second alignment layer 21b is positioned to form the upper second alignment layer 21b in a portion where no artificial electric field is applied. That is, the common electrode 270 may be present only below the upper first alignment layer 21a, and the upper second alignment layer 21b may be disposed at a position outside the common electrode 270.

The liquid crystal layer 300 has a negative dielectric anisotropy, and when the liquid crystal molecules have no electric field, portions of the alignment layers 11a, 11b, 21a, and 21b are formed on the surfaces of the two display panels 100 and 200 when the liquid crystal molecules have no electric field. Are oriented vertically. The liquid crystals of the vertically oriented liquid crystal layer 300 form a regular arrangement between molecules.

In particular, the regular arrangement of liquid crystal molecules formed by the lower second alignment layer 11b and the upper second alignment layer 21b serves as a barrier to prevent the uncured sealing material 310 from diffusing. Thus, the uncured sealing material 310 component is prevented from diffusing into the active region A. FIG.

In addition, since portions of the second alignment layers 11b and 21b are formed at portions where no artificial electric field is applied, the alignment of the liquid crystal molecules may be maintained without disturbing the alignment of the liquid crystal molecules. It can serve as a film that prevents the diffusion into the active region A.

Although the preferred embodiments of the present invention have been described in detail above, the scope of the present invention is not limited thereto, and various modifications and improvements of those skilled in the art using the basic concepts of the present invention defined in the following claims are also provided. It belongs to the scope of rights.

As in the present invention, when the alignment layer is formed in a portion where an artificial electric field is not applied between the active region and the sealant, the liquid crystal molecules may be arranged in a regular manner to prevent diffusion of the uncured sealant component into the active region.

Claims (5)

A first substrate and a second substrate facing each other, A liquid crystal layer sandwiched between the first substrate and the second substrate, A sealing material formed between the first substrate and the second substrate and surrounding and sealing the liquid crystal layer; A lower first alignment layer formed on a portion where an artificial electric field of the first substrate is formed, A lower second alignment layer formed between the lower first alignment layer and the sealant; An upper first alignment layer formed on a portion where an artificial electric field of the second substrate is formed; And an upper second alignment layer formed between the upper first alignment layer and the sealing material. In claim 1, The lower first alignment layer, the lower second alignment layer, the upper first alignment layer, and the upper second alignment layer are formed of polyimide. In claim 1, And the lower first alignment layer, the lower second alignment layer, the upper first alignment layer, and the upper second alignment layer vertically align the liquid crystal of the liquid crystal layer with respect to the first substrate. In claim 1, A plurality of pixel electrodes formed on the first substrate; Further comprising a common electrode formed on the second substrate, And the lower second alignment layer is disposed outside a region where the plurality of pixel electrodes are formed. In claim 4, And the upper second alignment layer is disposed outside a region where the common electrode is formed.
KR1020070040456A 2007-04-25 2007-04-25 Liquid crystal display KR20080095665A (en)

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KR1020070040456A KR20080095665A (en) 2007-04-25 2007-04-25 Liquid crystal display

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KR1020070040456A KR20080095665A (en) 2007-04-25 2007-04-25 Liquid crystal display

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102200653A (en) * 2010-03-23 2011-09-28 三星移动显示器株式会社 Liquid crystal display panel

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102200653A (en) * 2010-03-23 2011-09-28 三星移动显示器株式会社 Liquid crystal display panel
CN102200653B (en) * 2010-03-23 2015-06-03 三星显示有限公司 Liquid crystal display panel

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