KR20070028836A - Liquid crystal display - Google Patents

Liquid crystal display Download PDF

Info

Publication number
KR20070028836A
KR20070028836A KR1020050083536A KR20050083536A KR20070028836A KR 20070028836 A KR20070028836 A KR 20070028836A KR 1020050083536 A KR1020050083536 A KR 1020050083536A KR 20050083536 A KR20050083536 A KR 20050083536A KR 20070028836 A KR20070028836 A KR 20070028836A
Authority
KR
South Korea
Prior art keywords
substrate
liquid crystal
crystal display
pixel electrode
film
Prior art date
Application number
KR1020050083536A
Other languages
Korean (ko)
Inventor
김상우
박원상
서혜진
심창우
여용석
오주희
윤해영
이승규
이재영
임재익
장영주
차성은
최지연
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 KR1020050083536A priority Critical patent/KR20070028836A/en
Priority claimed from JP2006243985A external-priority patent/JP2007072470A/en
Publication of KR20070028836A publication Critical patent/KR20070028836A/en

Links

Images

Classifications

    • GPHYSICS
    • G02OPTICS
    • G02FDEVICES OR ARRANGEMENTS, THE OPTICAL OPERATION OF WHICH IS MODIFIED BY CHANGING THE OPTICAL PROPERTIES OF THE MEDIUM OF THE DEVICES OR ARRANGEMENTS FOR THE CONTROL OF THE INTENSITY, COLOUR, PHASE, POLARISATION OR DIRECTION OF LIGHT, e.g. SWITCHING, GATING, MODULATING OR DEMODULATING; TECHNIQUES OR PROCEDURES FOR THE OPERATION THEREOF; FREQUENCY-CHANGING; NON-LINEAR OPTICS; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
    • G02F1/00Devices 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
    • G02F1/01Devices 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 
    • G02F1/13Devices 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
    • G02F1/133Constructional arrangements; Operation of liquid crystal cells; Circuit arrangements
    • G02F1/1333Constructional arrangements; Manufacturing methods
    • G02F1/1335Structural association of cells with optical devices, e.g. polarisers or reflectors
    • GPHYSICS
    • G02OPTICS
    • G02FDEVICES OR ARRANGEMENTS, THE OPTICAL OPERATION OF WHICH IS MODIFIED BY CHANGING THE OPTICAL PROPERTIES OF THE MEDIUM OF THE DEVICES OR ARRANGEMENTS FOR THE CONTROL OF THE INTENSITY, COLOUR, PHASE, POLARISATION OR DIRECTION OF LIGHT, e.g. SWITCHING, GATING, MODULATING OR DEMODULATING; TECHNIQUES OR PROCEDURES FOR THE OPERATION THEREOF; FREQUENCY-CHANGING; NON-LINEAR OPTICS; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
    • G02F1/00Devices 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
    • G02F1/01Devices 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 
    • G02F1/13Devices 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
    • G02F1/133Constructional arrangements; Operation of liquid crystal cells; Circuit arrangements
    • G02F1/1333Constructional arrangements; Manufacturing methods
    • G02F1/1335Structural association of cells with optical devices, e.g. polarisers or reflectors
    • G02F1/133528Polarisers
    • GPHYSICS
    • G02OPTICS
    • G02FDEVICES OR ARRANGEMENTS, THE OPTICAL OPERATION OF WHICH IS MODIFIED BY CHANGING THE OPTICAL PROPERTIES OF THE MEDIUM OF THE DEVICES OR ARRANGEMENTS FOR THE CONTROL OF THE INTENSITY, COLOUR, PHASE, POLARISATION OR DIRECTION OF LIGHT, e.g. SWITCHING, GATING, MODULATING OR DEMODULATING; TECHNIQUES OR PROCEDURES FOR THE OPERATION THEREOF; FREQUENCY-CHANGING; NON-LINEAR OPTICS; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
    • G02F1/00Devices 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
    • G02F1/01Devices 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 
    • G02F1/13Devices 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
    • G02F1/133Constructional arrangements; Operation of liquid crystal cells; Circuit arrangements
    • G02F1/1333Constructional arrangements; Manufacturing methods
    • G02F1/1337Surface-induced orientation of the liquid crystal molecules, e.g. by alignment layers
    • G02F1/13378Surface-induced orientation of the liquid crystal molecules, e.g. by alignment layers by treatment of the surface, e.g. embossing, rubbing, light irradiation
    • G02F1/133784Surface-induced orientation of the liquid crystal molecules, e.g. by alignment layers by treatment of the surface, e.g. embossing, rubbing, light irradiation by rubbing
    • GPHYSICS
    • G02OPTICS
    • G02FDEVICES OR ARRANGEMENTS, THE OPTICAL OPERATION OF WHICH IS MODIFIED BY CHANGING THE OPTICAL PROPERTIES OF THE MEDIUM OF THE DEVICES OR ARRANGEMENTS FOR THE CONTROL OF THE INTENSITY, COLOUR, PHASE, POLARISATION OR DIRECTION OF LIGHT, e.g. SWITCHING, GATING, MODULATING OR DEMODULATING; TECHNIQUES OR PROCEDURES FOR THE OPERATION THEREOF; FREQUENCY-CHANGING; NON-LINEAR OPTICS; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
    • G02F1/00Devices 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
    • G02F1/01Devices 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 
    • G02F1/13Devices 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
    • G02F1/133Constructional arrangements; Operation of liquid crystal cells; Circuit arrangements
    • G02F1/1333Constructional arrangements; Manufacturing methods
    • G02F1/1335Structural association of cells with optical devices, e.g. polarisers or reflectors
    • G02F1/133504Diffusing, scattering, diffracting elements
    • G02F2001/133507Luminance enhancement films
    • GPHYSICS
    • G02OPTICS
    • G02FDEVICES OR ARRANGEMENTS, THE OPTICAL OPERATION OF WHICH IS MODIFIED BY CHANGING THE OPTICAL PROPERTIES OF THE MEDIUM OF THE DEVICES OR ARRANGEMENTS FOR THE CONTROL OF THE INTENSITY, COLOUR, PHASE, POLARISATION OR DIRECTION OF LIGHT, e.g. SWITCHING, GATING, MODULATING OR DEMODULATING; TECHNIQUES OR PROCEDURES FOR THE OPERATION THEREOF; FREQUENCY-CHANGING; NON-LINEAR OPTICS; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
    • G02F2201/00Constructional arrangements not provided for in groups G02F1/00 - G02F7/00
    • G02F2201/12Constructional arrangements not provided for in groups G02F1/00 - G02F7/00 electrode
    • G02F2201/121Constructional arrangements not provided for in groups G02F1/00 - G02F7/00 electrode common or background
    • GPHYSICS
    • G02OPTICS
    • G02FDEVICES OR ARRANGEMENTS, THE OPTICAL OPERATION OF WHICH IS MODIFIED BY CHANGING THE OPTICAL PROPERTIES OF THE MEDIUM OF THE DEVICES OR ARRANGEMENTS FOR THE CONTROL OF THE INTENSITY, COLOUR, PHASE, POLARISATION OR DIRECTION OF LIGHT, e.g. SWITCHING, GATING, MODULATING OR DEMODULATING; TECHNIQUES OR PROCEDURES FOR THE OPERATION THEREOF; FREQUENCY-CHANGING; NON-LINEAR OPTICS; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
    • G02F2201/00Constructional arrangements not provided for in groups G02F1/00 - G02F7/00
    • G02F2201/12Constructional arrangements not provided for in groups G02F1/00 - G02F7/00 electrode
    • G02F2201/123Constructional arrangements not provided for in groups G02F1/00 - G02F7/00 electrode pixel

Abstract

According to the present invention, a first substrate, a second substrate facing the first substrate, a first polarizer positioned on an outer surface of the first substrate, a second polarizer positioned on an outer surface of the second substrate, and the It is a liquid crystal display device containing the biaxial film located between a 1st board | substrate and a said 1st polarizing plate. Thus, by attaching a biaxial film on the outside of one of the two substrates, a shortening film on the outside of the other one can reduce the thickness and manufacturing cost of the film and may not be limited by the range of use of Rth. In addition, the liquid crystal display may have a wide viewing angle.

Description

Liquid crystal display {LIQUID CRYSTAL DISPLAY}

1 is a layout view of 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 of FIG. 1 taken along the line II-II;

3, 5, 7 and 9 are layout views of a thin film transistor array panel at an intermediate stage of a method of manufacturing the thin film transistor array panel of the liquid crystal display device shown in FIG. 1 according to an embodiment of the present invention;

4, 6, 8, and 10 show the thin film transistor array panels shown in FIGS. 3, 5, 7, and 9, respectively, along the IV-IV line, the VI-VI line, the VIII-VIII line, and the XX line. It is a cross-sectional view,

11 to 13 are cross-sectional views illustrating a method of manufacturing the common electrode display panel of the liquid crystal display shown in FIG. 1 according to an embodiment of the present invention.

14 is a view illustrating a contrast ratio according to an angle of a liquid crystal display according to an exemplary embodiment of the present invention.

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

3: liquid crystal layer 12: lower polarizer

14: biaxial film 22: upper polarizing plate

24: shortening film 71a-71c; Incision

100: thin film transistor array panel

110: lower insulating substrate 121: gate line

124: gate electrode 131, 136, 137: sustain electrode line

140: gate insulating film 154: semiconductor

163 and 165: ohmic contact 171: data line

173: source electrode 175, 177: drain electrode

180: protective film 191, 191a-191c: pixel electrode

200: common electrode display panel 210: upper insulating substrate

220: light blocking member 230: color filter

250: overcoat 270: common electrode

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. The liquid crystal display includes two display panels on which field generating electrodes such as a pixel electrode and a common electrode are formed, and a liquid crystal layer interposed therebetween. Is applied to generate an electric field in the liquid crystal layer, thereby determining the orientation of liquid crystal molecules in the liquid crystal layer and controlling the polarization of incident light to display an image.

The liquid crystal display also includes a plurality of signal lines such as a gate line and a data line for controlling a switching element and a switching element connected to each pixel electrode to apply a voltage to the pixel electrode.

Among such liquid crystal display devices, a liquid crystal display device having a vertically aligned mode 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 liquid crystal display device is gaining attention due to its large contrast ratio and wide reference viewing angle. . Here, the reference viewing angle refers to a viewing angle having a contrast ratio of 1:10 or a luminance inversion limit angle between gray levels. The VA mode includes a multi-domain vertical alignment (MVA) mode, a patterned vertical alignment (PVA) mode, and the like. However, in the case of the MVA mode, a separate process for making protrusions on the common electrode display panel and the thin film transistor array display panel is required, thereby increasing the manufacturing cost, and the PVA technology cannot control the arrangement of liquid crystals disposed on the slit. The aperture ratio is reduced. In particular, when the small and medium-sized liquid crystal display includes the PVA mode, the aperture ratio decreases and the luminance decreases.

In addition, in the vertical alignment type liquid crystal display, various films are used to improve viewing angle or compensate for retardation.

However, these films are usually expensive, which is a detrimental factor in lowering the manufacturing cost of the liquid crystal display, and increases the thickness by using multiple films.

SUMMARY OF THE INVENTION The present invention has been made in an effort to provide a liquid crystal display device having a wide viewing angle and reducing the thickness of a film and reducing cost.

The liquid crystal display according to the exemplary embodiment of the present invention may include a first substrate, a second substrate facing the first substrate, a first polarizer positioned on an outer surface of the first substrate, and an outer surface of the second substrate. It includes a second polarizing plate positioned, and a biaxial film positioned between the first substrate and the first polarizing plate.

A shortening film may be further included between the second substrate and the second polarizing plate.

The transmission axis of the first polarizing plate and the transmission axis of the second polarizing plate may be perpendicular to each other.

R0 and Rth of the biaxial film are respectively

100≤ R0 = (n x n y ) × d≤150

200≤Rth = {(n x + n y ) / 2-n z } × d ≦ 350.

The biaxial film has a slow axis and a fast axis, so that the phase difference between the light in the slow axial direction and the light in the fast axial direction is 1 / 4λ so that the circularly polarized light can be changed into linearly polarized light or the linearly polarized light can be changed into circularly polarized light.

The slow axis or the fast axis of the biaxial film may be 25 ° to 65 ° or −25 ° to −65 ° with the transmission axis of the first or second polarizing plate.

The slow axis or the fast axis may be ± 45 ° with the transmission axis of the first or second polarizer.

The display device may further include a liquid crystal between the first substrate and the second substrate, and the liquid crystal may be arranged in a vertical alignment (VA) mode.

The display device may further include an alignment layer formed on an inner surface of the first substrate or the second substrate.

The alignment layer may be rubbing.

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.

The pixel electrode may include a plurality of pixel electrode parts and a connection part, the pixel electrode parts may be electrically connected to each other through a connection part, and the common electrode may include an opening facing the center part of each pixel electrode part.

The corners of the pixel electrode parts may be rounded.

DETAILED DESCRIPTION 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.

First, a liquid crystal display according to an exemplary embodiment of the present invention will be described in detail with reference to FIGS. 1 and 2.

1 is a layout view of 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 of FIG. 1 taken along the line II-II. FIG.

1 and 2, the liquid crystal display according to the present exemplary embodiment includes a thin film transistor array panel 100 and a common electrode panel 200 facing each other, and a liquid crystal layer interposed between the two display panels 100 and 200. Include 3).

First, the thin film transistor array panel 100 will be described.

A plurality of gate lines 121 and a plurality of storage electrode lines 131 are formed on an insulating substrate 110 made of transparent glass or plastic.

The gate line 121 transmits a gate signal and mainly extends in a horizontal direction. Each gate line 121 includes a plurality of gate electrodes 124 protruding upward and end portions 129 having a large area for connection with another layer or an external driving circuit. A gate driving circuit (not shown) for generating a gate signal may be mounted on a flexible printed circuit film (not shown) attached to the substrate 110 or directly mounted on the substrate 110, It may be integrated into the substrate 110. When the gate driving circuit is integrated on the substrate 110, the gate line 121 may extend to be directly connected to the gate driving circuit.

The storage electrode line 131 receives a predetermined voltage and almost extends in parallel with the gate line 121. Each storage electrode line 131 is positioned between two adjacent gate lines 121 and is closer to the upper side of the two gate lines 121. Each storage electrode line 131 includes a vertical portion 136 extending downward and four horizontal portions 137 protruding left and right from each vertical portion 136. However, the shape and arrangement of the storage electrode line 131 may be modified in various ways.

The gate line 121 and the storage electrode line 131 may be formed of aluminum-based metal such as aluminum (Al) or aluminum alloy, silver-based metal such as silver (Ag) or silver alloy, copper-based metal such as copper (Cu) or copper alloy, or molybdenum ( It may be made of molybdenum-based metals such as Mo) or molybdenum alloy, chromium (Cr), tantalum (Ta) and titanium (Ti). However, they may have a multilayer structure including two conductive films (not shown) having different physical properties. One of the conductive films is made of a metal having low resistivity, such as aluminum-based metal, silver-based metal, or copper-based metal, so as to reduce signal delay or voltage drop. In contrast, other conductive films are made of other materials, particularly materials having excellent physical, chemical, and electrical contact properties with indium tin oxide (ITO) and indium zinc oxide (IZO), such as molybdenum-based metals, chromium, tantalum, and titanium. Good examples of such a combination include a chromium bottom film, an aluminum (alloy) top film, and an aluminum (alloy) bottom film and a molybdenum (alloy) top film. However, the gate line 121 and the storage electrode line 131 may be made of various other metals or conductors.

Side surfaces of the gate line 121 and the storage electrode line 131 are inclined with respect to the surface of the substrate 110, and the inclination angle is preferably about 30 ° to about 80 °.

A gate insulating layer 140 made of silicon nitride (SiNx) or silicon oxide (SiOx) is formed on the gate line 121 and the storage electrode line 131.

On the gate insulating layer 140, a plurality of island semiconductors 154 made of hydrogenated amorphous silicon (amorphous silicon is abbreviated as a-Si), polycrystalline silicon, or the like are formed. The semiconductor 154 is positioned over the gate electrode 124.

A pair of island resistive ohmic contacts 163 and 165 are formed over each semiconductor 154. The ohmic contacts 163 and 165 may be made of a material such as n + hydrogenated amorphous silicon in which n-type impurities such as phosphorus are heavily doped, or may be made of silicide.

Side surfaces of the semiconductor 154 and the ohmic contacts 163 and 165 are also inclined with respect to the surface of the substrate 110, and the inclination angle is about 30 ° to 80 °.

A plurality of data lines 171 and a plurality of drain electrodes 175 are formed on the ohmic contacts 163 and 165 and the gate insulating layer 140.

The data line 171 transmits a data signal and mainly extends in the vertical direction to cross the gate line 121 and the storage electrode line 131. Each data line 171 includes a plurality of source electrodes 173 extending toward the gate electrode 124 and an end portion 179 having a large area for connection with another layer or an external driving circuit. A data driving circuit (not shown) for generating a data signal is mounted on a flexible printed circuit film (not shown) attached to the substrate 110, directly mounted on the substrate 110, or integrated in the substrate 110. Can be. When the data driving circuit is integrated on the substrate 110, the data line 171 may be extended to be directly connected to the data driving circuit.

The drain electrode 175 is separated from the data line 171. The drain electrode 175 faces the source electrode 173 with respect to the gate electrode 124. The drain electrode 175 is connected to the conductor 176 for the storage capacitor. The storage capacitor conductor 176 is formed along the vertical portion 136 of the storage electrode line positioned on the right side of the pixel, the storage electrode line 131, and the vertical portion 136 of the storage electrode line positioned on the left side of the pixel. And the left and right vertical portions 136 and the storage electrode lines 131 of the storage electrode lines overlap. In addition, the conductor 176 for the storage capacitor includes four protrusions 177 that overlap each other with the horizontal portion 137 of the storage electrode line 131.

One gate electrode 124, one source electrode 173, and one drain electrode 175 together with the semiconductor 154 form one thin film transistor (TFT), and a channel of the thin film transistor. ) Is formed in the semiconductor 154 between the source electrode 173 and the drain electrode 175.

The data line 171, the drain electrode 175, and the conductor 176 for the storage capacitor are preferably made of a refractory metal such as molybdenum, chromium, tantalum, and titanium, or an alloy thereof. Not shown) and a low resistance conductive film (not shown). Examples of the multilayer structure include a double layer of chromium or molybdenum (alloy) lower layer and an aluminum (alloy) upper layer, and a triple layer of molybdenum (alloy) lower layer and aluminum (alloy) interlayer and molybdenum (alloy) upper layer. However, the data line 171, the drain electrode 175, and the conductor 176 for the storage capacitor may be made of various other metals or conductors.

The data line 171, the drain electrode 175, and the conductor 176 for the storage capacitor are also preferably inclined at an inclination angle of about 30 ° to about 80 ° with respect to the surface of the substrate 110.

The ohmic contacts 163 and 165 exist only between the semiconductor 154 thereunder and the data line 171 thereon, the drain electrode 175 and the conductor 176 for the storage capacitor, and have contact resistance therebetween. Lower it. The semiconductor 154 may be exposed between the source electrode 173 and the drain electrode 175 and not covered by the data line 171, the drain electrode 175, and the storage capacitor conductor 176.

A passivation layer 180 is formed on the data line 171, the drain electrode 175, the storage capacitor conductor 176, and the exposed semiconductor 154. The passivation layer 180 may be made of an inorganic insulator or an organic insulator, and may have a flat surface. The organic insulator preferably has a dielectric constant of 4.0 or less, and may have photosensitivity. However, the passivation layer 180 may have a double layer structure of the lower inorganic layer and the upper organic layer so as not to damage the exposed portion of the semiconductor 154 while maintaining excellent insulating properties of the organic layer.

In the passivation layer 180, a plurality of contact holes 182 and 185 exposing the end portion 179 and the drain electrode 175 of the data line 171 are formed, respectively, and the passivation layer 180 and the gate insulating layer are formed. A plurality of contact holes 181 exposing the end portion 129 of the gate line 121 are formed at 140.

A plurality of pixel electrodes 191 and a plurality of contact assistants 81 and 82 are formed on the passivation layer 180. They may be made of a transparent conductive material such as ITO or IZO or a reflective metal such as aluminum, silver, chromium or an alloy thereof.

Each pixel electrode 191 may include a first pixel electrode portion 191a, a second pixel electrode portion 191b, a third pixel electrode portion 191c, and a first pixel electrode portion 191a. And a first connecting portion 193a and a second connecting portion 193b.

The first pixel electrode part 191a, the second pixel electrode part 191b, and the third pixel electrode part 191c have a substantially square shape with rounded corners, and are arranged side by side up and down. The first connector 193a is positioned between the first pixel electrode part 191a and the second pixel electrode part 191b and electrically connects the first pixel electrode part 191a and the second pixel electrode part 191b. do. The second connector 193b is positioned between the second pixel electrode part 191b and the third pixel electrode part 191c and electrically connects the second pixel electrode part 191b and the third pixel electrode part 191c. do.

The first pixel electrode part 191a, the second pixel electrode part 191b, and the third pixel electrode part 191c may have a polygonal or circular shape.

The third pixel electrode 191c is physically and electrically connected to the drain electrode 175 through the contact hole 185 and receives a data voltage from the drain electrode 175. The pixel electrode 191 to which the data voltage is applied is formed between the two electrodes 191 and 270 by generating an electric field together with the common electrode 270 of the common electrode display panel 200 to which the common voltage is applied. The direction of the liquid crystal molecules of the liquid crystal layer 3 is determined. The polarization of light passing through the liquid crystal layer 3 varies according to the direction of the liquid crystal molecules determined as described above. The pixel electrode 191 and the common electrode 270 form a capacitor (hereinafter, referred to as a "liquid crystal capacitor") to maintain an applied voltage even after the thin film transistor is turned off.

The storage capacitor conductor 176 connected to the pixel electrode 191 and the drain electrode 175 is connected to the storage electrode line 131 including the vertical portion 136 and the horizontal portion 137 of the storage electrode line 131. Overlap with A capacitor formed by the pixel electrode 191 and the storage capacitor conductor 176 electrically connected to the storage electrode line 131 is called a storage capacitor, and the storage capacitor enhances the voltage holding capability of the liquid crystal capacitor. do.

The horizontal portion 137 of the storage electrode line 131 and the protrusion 177 of the drain electrode 175 are disposed between the first pixel electrode portion 191a and the second pixel electrode portion 191b and the second pixel electrode portion 191b. ) Between the first pixel electrode part 191a and the second pixel electrode part 191b and between the second pixel electrode part 191b and the third pixel electrode part 191c. Blocks light passing through 191c).

The contact auxiliary members 81 and 82 are connected to the end portion 129 of the gate line 121 and the end portion 179 of the data line 171 through the contact holes 181 and 182, respectively. The contact auxiliary members 81 and 82 compensate for and protect the adhesion between the end portion 129 of the gate line 121 and the end portion 179 of the data line 171 and the external device.

Next, the common electrode display panel 200 will be described.

A light blocking member 220 is formed on an insulating substrate 210 made of transparent glass, plastic, or the like. The light blocking member 220 is also referred to as a black matrix and defines a plurality of opening regions facing the pixel electrode 191 while preventing light leakage between the pixel electrodes 191.

A plurality of color filters 230 is also formed on the substrate 210 and the light blocking member 220. The color filter 230 is mostly present in an area surrounded by the light blocking member 230, and may extend long along the column of pixel electrodes 191. Each color filter 230 may display one of primary colors such as three primary colors of red, green, and blue.

An overcoat 250 is formed on the color filter 230 and the light blocking member 220. The overcoat 250 may be made of an (organic) insulator, which prevents the color filter 230 from being exposed and provides a flat surface. The overcoat 250 may be omitted.

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

The common electrode 270 includes a plurality of openings 71a, 71b, and 71c from which a portion of the common electrode 270 is removed to vary the inclination direction of the liquid crystal molecules. The openings 71a, 71b, and 71c correspond to central portions of the first pixel electrode portion 191a, the second pixel electrode portion 191b, and the third pixel electrode portion 191c, respectively.

When a voltage is applied between the pixel electrode 191 and the common electrode 270, a region adjacent to the openings 71a, 71b, and 71c, and between the first pixel electrode portion 191a and the second pixel electrode portion 191b. Distortion of the electric field occurs in the region and the region between the second pixel electrode portion 191b and the third pixel electrode portion 191c. The distorted electric field may vary the inclination direction of the liquid crystals of the liquid crystal layer 3 and the reference viewing angle of the liquid crystal display becomes large. In addition, the response speed of the liquid crystal molecules can be increased.

The shape and arrangement of the openings 71a-71c for determining the inclination direction of the liquid crystal molecules may be changed, and the at least one cutout 71a-71c may be a protrusion (not shown) or a depression. (Not shown). The protrusions may be made of organic or inorganic materials and may be disposed above or below the field generating electrodes 191 and 270.

An alignment layer (not shown) for aligning the liquid crystal layer 3 is coated on the inner surfaces of the display panels 100 and 200, and biaxial is applied to the outer surfaces of the display panels 100 and 200, respectively. A film 14 and a uniaxial film 24 are provided, and outer and lower polarizing plates 12 and 22 are provided on the outer surface thereof.

The upper polarizer 22 and the lower polarizer 12 each have a transmission axis, and the transmission axis of the upper polarizer 22 and the transmission axis of the lower polarizer 12 are formed to be perpendicular to each other.

The biaxial film 14 has a fast axis and a slow axis that are perpendicular to each other, such that when light passes through, the light in the fast axial direction has a faster phase than the light in the slow axial direction. The biaxial film 14 is preferably formed such that the phase difference between the slow axis and the fast axis of light transmitted therethrough is 1 / 4λ. The fast axis or the slow axis of the biaxial film 14 and the transmission axis of the polarizing plates 12 and 22 have a maximum phase difference when they are at an angle of 45 ° so that they generally form an angle of 45 °, but are mutually perpendicular or horizontal to each other. It is also possible to achieve different angles, if not otherwise, and can achieve approximately 25 ° to 65 ° or -20 ° to -65 °. In this way, the linearly polarized light can be changed into circularly polarized light by giving a phase difference of 1/4 wavelength, and the response speed of the liquid crystal can be increased by using circularly polarized light and centered on the openings 71a, 71b, 71c of the common electrode 270. Eliminate textures that can be radial.

In addition, the biaxial film 14 has different refractive indices (nx, ny, nz) in the x, y, and z-axis directions, and the single-axis film 12 has a refractive index in only one of the x, y, and z axes ( nx, ny, nz) are different.

It is preferable that the biaxial film 14 has the following properties.

100≤R0 = (nx-ny) × d≤150 (nm)

200≤Rth = {(nx + ny) / 2-nz} × d≤350 (nm)

Here, d represents the thickness of the biaxial film 14, Rth represents a delay value in the thickness direction, and Ro represents a delay value in a direction perpendicular to the thickness direction Rth. Considering the Rth value of the shortened film 24 or the upper and lower polarizers 12 and 22 may have a larger Rth value.

Contrary to this embodiment, the biaxial film 14 is located on the outer surface of the substrate 210 of the common electrode display panel 200, and the short-axis film 24 is outside the substrate 110 of the thin film transistor array panel 100. It can be located on the side. In addition, the shortening film 24 can be abbreviate | omitted.

This reduces the thickness and manufacturing cost of the film by using only one film without using the compensation film and the retardation film or by using only one biaxial film (14). You can do it nicely. In addition, by increasing the Rth value of one biaxial film 14, the viewing angle of the liquid crystal display device can be improved.

If the Rth value of the biaxial film 14 is not large enough, the Rth value of a tetra acetate (TAC) film, which is a support of the polarizing plates 12 and 22, may be increased to compensate for this.

The liquid crystal in the liquid crystal layer 3 has a vertical alignment (VA), a twisted alignment (Twisted Nematic, TN), a reverse Twisted Nematic (Reverse TN), a mixed Twisted Nematic (MTN), homo It is arranged in Homogeneous orientation, Reverse Electrically Controlled Birefringence (Reverse ECB) mode, and so on. Preferably, the liquid crystal molecules in the liquid crystal layer 3 are arranged in a vertical alignment mode in which their major axes are perpendicular to the surfaces of the two display panels in the absence of an electric field.

The liquid crystal display may further include a plurality of spacers (not shown) that support the thin film transistor array panel 100 and the common electrode display panel 200 to form a gap therebetween.

The liquid crystal display may further include a sealant (not shown) that couples the thin film transistor array panel 100 and the common electrode panel 200. The sealing material is positioned at the edge of the common electrode display panel 200.

Next, a method of manufacturing the thin film transistor array panel of the liquid crystal display shown in FIGS. 1 and 2 according to an embodiment of the present invention will be described in detail with reference to FIGS. 3 to 12.

First, as shown in FIGS. 3 and 4, an aluminum-based metal such as aluminum (Al) or an aluminum alloy, a silver-based metal such as silver (Ag) or a silver alloy, and the like on the insulating substrate 110 by sputtering or the like. A conductive film made of copper-based metal such as copper (Cu) or copper alloy, molybdenum-based metal such as molybdenum (Mo) or molybdenum alloy, chromium (Cr), tantalum (Ta), titanium (Ti) and the like is formed.

Thereafter, the conductive layer is etched by a photolithography process to form a plurality of gate lines 121 and a plurality of storage electrode lines 131 including the plurality of gate electrodes 124 and the end portions 129.

Next, as shown in FIGS. 5 and 6, the gate insulating layer 140 may be covered by a low temperature chemical vapor deposition (LPCVD) or plasma enhanced chemical vapor deposition (PECVD) method to cover the gate line 121 and the storage electrode line 131. ), A hydrogenated amorphous silicon film, and an amorphous silicon film (n + amorphous silicon film) doped with a high concentration of n-type impurities in this order, and the hydrogenated amorphous silicon film and the n + amorphous silicon film are patterned to form a plurality of semiconductors 154 and a plurality of impurities. The semiconductor 164 is formed. The gate insulating layer 140 is formed of silicon nitride or the like.

Next, as shown in FIGS. 7 and 8, a conductive film made of a refractory metal such as chromium or molybdenum-based metal, tantalum, and titanium is laminated by sputtering. Thereafter, the conductive layer is etched by a photolithography process to form a data line 171 including a plurality of source electrodes 173, a plurality of drain electrodes 175, and a plurality of storage capacitor conductors 176.

Then, the portion of the impurity semiconductor 164 not covered by the data line 171 and the drain electrode 175 is removed to separate the impurity semiconductor 164 into two ohmic contacts 163 and 165, while A portion of the semiconductor 154 is exposed. Subsequently, an oxygen plasma is preferably performed to stabilize the exposed surface of the semiconductor 154.

Next, as shown in FIGS. 9 and 10, the passivation layer 180 is stacked and photo-etched together with the gate insulating layer 140 to form a plurality of contact holes 181, 182, and 185. The contact holes 181, 182, and 185 expose the drain electrode 175, the gate line 121 end portion 129, and the data line 171 end portion 179, respectively.

Next, the IZO or ITO layers are stacked by a sputtering method, and patterned by a photolithography process to form a plurality of pixel electrodes 191 and a plurality of contact auxiliary members 81 and 82. The alignment layer 11 is coated on the pixel electrode 191. The alignment layer 11 may be rubbed.

Next, a method of manufacturing the common electrode display panel of the liquid crystal display illustrated in FIGS. 1 and 2 according to an exemplary embodiment of the present invention will be described in detail with reference to FIGS. 11 to 13.

FIG. 11 illustrates forming a black matrix 220 on the upper insulating substrate 210. The black matrix 220 is formed by depositing a metal layer such as chromium (Cr) or a double layer of a metal oxide and a metal, and then patterning it by a photolithography process.

Thereafter, as shown in FIG. 12, the color filter 230 is formed between the black matrices 220. The color filter generally uses a three-color color filter 230 of red, green, and blue, and is formed thicker than the thickness of the black matrix 220. The color filter 230 is coated with a pigment dispersion photosensitive resin having color spectroscopic characteristics, and then baked on a hot plate and forms a color filter 230 for each of red, green, and blue colors through a photolithography process.

After that, as shown in FIG. 13, the overcoat 250 is formed on the color filter 230, and a common electrode 270 is formed on the color filter 230 using a transparent electrode such as ITO, and the alignment layer 21 is coated. The alignment layer 21 may be rubbed.

Next, after the lower insulating substrate 110 and the upper insulating substrate 210 are bonded to each other, the biaxial film 14 and the lower polarizing plate 12 are attached to the outer side of the lower insulating substrate 110 and the upper insulating substrate 210 is attached. The shorten film 24 and the upper polarizing plate 22 are affixed on the outer side. At this time, the transmission axis of the upper polarizing plate 22 is generally disposed to be perpendicular to the transmission axis of the lower polarizing plate 12, but may be arranged to be parallel to each other depending on the alignment mode of the liquid crystal.

FIG. 14 illustrates a contrast ratio (CR) according to an observation angle of a liquid crystal display according to an exemplary embodiment of the present invention. By using one biaxial film 14 as in the present invention and further increasing the Rth value, a more complete viewing angle can be obtained.

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 described above, by attaching a biaxial film on the outside of one of the two substrates, a shortening film on the outside of the other can reduce the thickness and manufacturing cost of the film and can not be limited by the range of use of R th have. In addition, the liquid crystal display may have a wide viewing angle.

Claims (13)

  1. First substrate,
    A second substrate facing the first substrate,
    A first polarizer positioned on an outer surface of the first substrate,
    A second polarizer positioned on an outer surface of the second substrate, and
    Biaxial film positioned between the first substrate and the first polarizing plate
    Containing
    Liquid crystal display.
  2. In claim 1,
    And a shortened film between the second substrate and the second polarizing plate.
  3. The method of claim 1 or 2,
    The transmission axis of the first polarizing plate and the transmission axis of the second polarizing plate are perpendicular to each other.
  4. The method of claim 1 or 2,
    R0 and Rth of the biaxial film are respectively
    100≤R0 = (n x -n y ) × d≤150
    200≤Rth = {(n x + n y ) / 2- n z } × d≤350
    Liquid crystal display that satisfies.
  5. The method of claim 1 or 2,
    The biaxial film has a slow axis and a fast axis, and the phase difference between the light in the slow axial direction and the light in the fast axial direction is 1 / 4λ to change the circularly polarized light to linearly polarized light or circularly polarized light to circularly polarized light.
  6. In claim 5,
    The slow axis or the fast axis of the biaxial film is a liquid crystal display of 25 ° to 65 ° or -25 ° to -65 ° with the transmission axis of the first or second polarizing plate.
  7. In claim 6,
    The slow axis or the fast axis is ± 45 ° with the transmission axis of the first or second polarizing plate.
  8. The method of claim 1 or 2,
    Further comprising a liquid crystal between the first substrate and the second substrate,
    And the liquid crystals are arranged in a vertical alignment (VA) mode.
  9. The method of claim 1 or 2,
    And an alignment layer formed on an inner surface of the first substrate or the second substrate.
  10. In claim 9,
    And the alignment layer is rubbing.
  11. The method of claim 1 or 2,
    A plurality of pixel electrodes formed on the first substrate, and
    Common electrode formed on the second substrate
    Liquid crystal display further comprising.
  12. In claim 11,
    The pixel electrode includes a plurality of pixel electrode parts and a connection part.
    The pixel electrode portions are electrically connected to each other through a connecting portion,
    The common electrode includes an opening facing the central portion of each pixel electrode portion.
    Liquid crystal display.
  13. In claim 12,
    The corners of the pixel electrode parts are rounded.
KR1020050083536A 2005-09-08 2005-09-08 Liquid crystal display KR20070028836A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
KR1020050083536A KR20070028836A (en) 2005-09-08 2005-09-08 Liquid crystal display

Applications Claiming Priority (4)

Application Number Priority Date Filing Date Title
KR1020050083536A KR20070028836A (en) 2005-09-08 2005-09-08 Liquid crystal display
CNA2006101267496A CN1928660A (en) 2005-09-08 2006-09-06 Display panel
JP2006243985A JP2007072470A (en) 2005-09-08 2006-09-08 Liquid crystal display
US11/517,875 US20070052891A1 (en) 2005-09-08 2006-09-08 Display panel

Publications (1)

Publication Number Publication Date
KR20070028836A true KR20070028836A (en) 2007-03-13

Family

ID=37858688

Family Applications (1)

Application Number Title Priority Date Filing Date
KR1020050083536A KR20070028836A (en) 2005-09-08 2005-09-08 Liquid crystal display

Country Status (2)

Country Link
KR (1) KR20070028836A (en)
CN (1) CN1928660A (en)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN104808407B (en) * 2015-05-07 2018-05-01 深圳市华星光电技术有限公司 TFT array substrate

Also Published As

Publication number Publication date
CN1928660A (en) 2007-03-14

Similar Documents

Publication Publication Date Title
US8553189B2 (en) Color filter substrate and liquid crystal display panel including the same
US10488726B2 (en) Liquid crystal display device
US7110075B2 (en) Liquid crystal display with domain-defining members and separate opening in the common electrode overlapping the gate or data lines
US7978296B2 (en) Liquid crystal display and thin film transistor substrate therefor
US7894026B2 (en) Thin film transistor array panel and liquid crystal display including light shield
US7292303B2 (en) Liquid crystal display and panel therefor including regular and successive regular domain defining members
US7483090B2 (en) Liquid crystal display having first and second subpixel electrodes connected to coupling electrode through respective contact holes and third subpixel electrode separated from the first two but capacitively coupled thereto
JP5552518B2 (en) Liquid crystal display
US8253913B2 (en) Liquid crystal display and thin film transistor array panel therefor
US7847906B2 (en) Liquid crystal display
DE102010036792B4 (en) Transflective IPS-LCD device and method of making a transflective IP S-LCD device
TWI416733B (en) Thin film transistor array panel and liquid crystal display including the panel
CN1908789B (en) Liquid crystal display device
JP5025129B2 (en) Thin film transistor display panel
JP5351388B2 (en) Display device
JP4813050B2 (en) Display plate and liquid crystal display device including the same
US7589801B2 (en) Liquid crystal display and method of manufacturing thereof
KR20080071001A (en) Liquid crystal display panel and method of manufacturing the same
US8400603B2 (en) Liquid crystal display panel and electronic apparatus
JP2006091890A (en) Liquid crystal display device
JP3788649B2 (en) Liquid crystal display
US20040233343A1 (en) Liquid crystal display and thin film transistor array panel therefor
US6954246B2 (en) Liquid crystal display
US20100025631A1 (en) Liquid crystal composition and liquid crystal display having same
US8363190B2 (en) Liquid crystal display device and method of fabricating the same

Legal Events

Date Code Title Description
WITN Withdrawal due to no request for examination