KR101205127B1 - Liquid crystal display device - Google Patents

Liquid crystal display device Download PDF

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Publication number
KR101205127B1
KR101205127B1 KR1020100106894A KR20100106894A KR101205127B1 KR 101205127 B1 KR101205127 B1 KR 101205127B1 KR 1020100106894 A KR1020100106894 A KR 1020100106894A KR 20100106894 A KR20100106894 A KR 20100106894A KR 101205127 B1 KR101205127 B1 KR 101205127B1
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KR
South Korea
Prior art keywords
liquid crystal
electrode
common
wiring
layer
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KR1020100106894A
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Korean (ko)
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KR20110048007A (en
Inventor
기꾸오 오노
Original Assignee
가부시키가이샤 재팬 디스프레이 이스트
파나소닉 액정 디스플레이 주식회사
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Priority to JPJP-P-2009-250172 priority Critical
Application filed by 가부시키가이샤 재팬 디스프레이 이스트, 파나소닉 액정 디스플레이 주식회사 filed Critical 가부시키가이샤 재팬 디스프레이 이스트
Priority to KR1020100106894A priority patent/KR101205127B1/en
Publication of KR20110048007A publication Critical patent/KR20110048007A/en
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    • 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
    • G02F1/1343Electrodes
    • G02F1/134309Electrodes characterised by their geometrical arrangement
    • G02F1/134363Electrodes characterised by their geometrical arrangement for applying an electric field parallel to the substrate, i.e. in-plane switching [IPS]
    • 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
    • G02F1/136Liquid crystal cells structurally associated with a semi-conducting layer or substrate, e.g. cells forming part of an integrated circuit
    • G02F1/1362Active matrix addressed cells
    • G02F1/136286Wiring, e.g. gate line, drain line
    • 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
    • G02F2001/133738Surface-induced orientation of the liquid crystal molecules, e.g. by alignment layers for homogeneous alignment
    • 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
    • G02F2201/40Arrangements for improving the aperture ratio

Abstract

An object of the present invention is to suppress a decrease in luminance when forming a metal wiring connected to a common electrode in order to realize a liquid crystal display device of a wide viewing angle IPS system having high aperture ratio performance. The liquid crystal display device includes a liquid crystal 20 and a circuit layer 40 including a plurality of wirings made of a thin film transistor and a metal, and a liquid crystal 20 and a circuit in order to drive the liquid crystal 20 in a transverse electric field driving method. The pixel electrode 80 and the common electrode 70 which consist of a transparent conductive film, respectively laminated | stacked through the interlayer insulation film 48 between the layers 40, and the several color layer of a different color are included, and each coloring The layer has the color filter 100 and the connection wiring 82 from which the light transmittance of a layer differs, respectively. The plurality of wirings include a common wiring 56 arranged to face any other colored layer, avoiding facing the colored layer having the highest light transmittance among the plurality of colored layers. The connection wiring 82 connects the common electrode 70 and the common wiring 56.

Description

Liquid crystal display device {LIQUID CRYSTAL DISPLAY DEVICE}

The present invention relates to a liquid crystal display device.

Conventionally, in the liquid crystal display device, the TFT substrate in which the thin film transistor (TFT) for driving a liquid crystal was formed, and the color filter substrate in which the color filter was formed, and the liquid crystal was sandwiched between them. In this liquid crystal display device, the method of applying and displaying a transverse electric field to a liquid crystal is called an in-plane switching (IPS) system or a transverse electric field drive system. It is known that this display device has a wide viewing angle performance.

In a liquid crystal display device, it is known to electrically connect a metal wiring to a common electrode made of indium tin oxide (ITO) (Patent Document 1). Since ITO has a high resistance value, the potential of the common electrode can be equalized by connecting a metal wiring having a low resistance value to the common electrode.

In addition, in order to reduce the power consumption by increasing the aperture ratio of the liquid crystal display device, even when the transparent common electrode is connected to the metal wiring to reduce the resistance, it is known that the number of metal wirings is not formed in all the pixels, but the number is reduced as necessary. have.

[Patent Document 1] Japanese Unexamined Patent Publication No. 2009-168878

Since the metal wiring is difficult to be formed only in the region where the original light such as the black matrix or the transistor does not pass, it must be formed so as to pass through the pixel region. For this reason, the aperture ratio is lowered by forming the metal wiring, whereby the luminance is lowered. However, it is desired to reduce the luminance as small as possible.

This invention aims at suppressing the fall of the brightness | luminance at the time of forming the metal wiring connected to a common electrode, in order to implement | achieve the liquid crystal display device of the IPS system of the wide viewing angle which has the performance of a high aperture ratio.

(1) A liquid crystal display device according to the present invention includes a liquid crystal, a thin film transistor, and a plurality of wirings, wherein the plurality of wirings are made of a circuit layer made of a metal, and in order to drive the liquid crystal in a transverse electric field driving method, the A color filter comprising a pixel electrode and a common electrode each formed of a transparent conductive film, and a plurality of colored layers of different colors, stacked between the liquid crystal and the circuit layer via an insulating film, and having a different light transmittance of each colored layer, respectively; And a plurality of wirings, wherein the plurality of wirings include common wirings arranged to face any of the other colored layers, avoiding facing the colored layers having the highest light transmittance among the plurality of colored layers. The connection wirings are characterized in that the common electrodes are connected to the common wirings. According to the present invention, since the metal wiring avoids opposing the colored layer having the highest luminance, the luminance of the light shielded by the metal wiring is originally low, so that the decrease in the luminance of the liquid crystal display device can be suppressed.

(2) In the liquid crystal display device according to (1), the thin film transistor has a gate electrode, a source electrode, and a drain electrode, and a part of the common electrode and a part of the common wiring are respectively located above the gate electrode. The connecting portion with the common electrode of the connecting wiring and the connecting portion with the common wiring of the connecting wiring may be located above the gate electrode, respectively.

(3) In the liquid crystal display device according to (2), the circuit layer includes a semiconductor layer, and the source electrode, the drain electrode, and the common wiring are each formed to be in contact with the semiconductor layer. It may be featured.

(4) In the liquid crystal display device according to any one of (1) to (3), the pixel electrode is disposed on the liquid crystal side of the insulating film, and the connection wiring is made of the transparent electrode film. And a portion parallel to the pixel electrode and a portion connected to the common electrode through the insulating film.

(5) In the liquid crystal display device according to any one of (1) to (4), the plurality of colored layers includes a red colored layer, and the common wiring is disposed so as to face the red colored layer. It may be characterized by the fact.

(6) In the liquid crystal display device according to (5),

The plurality of colored layers includes a blue colored layer,

The blue colored layer may be formed thicker than the colored layer of another color.

(7) In the liquid crystal display device according to (6),

The plurality of colored layers includes a green colored layer,

The common wiring may be arranged to avoid facing the green colored layer.

(8) In the liquid crystal display device according to any one of (1) to (3),

The common wiring may be made of a metal having a lower resistance than the transparent conductive film.

(9) In the liquid crystal display device according to (2),

The source electrode may be electrically connected to the pixel electrode.

(10) In the liquid crystal display device according to (2) or (9),

Have more black matrix,

The drain electrode may be arranged on one side of the plurality of pixels with the liquid crystal interposed therebetween, and the black matrix may be arranged on the other side.

1 is an exploded perspective view showing a liquid crystal display device according to an embodiment of the present invention.
FIG. 2 is a plan view illustrating a pixel electrode, a common electrode, and a circuit layer of the liquid crystal display shown in FIG. 1.
3 is a cross-sectional view taken along line III-III of the liquid crystal display shown in FIG. 2;
4 is a cross-sectional view taken along the line IV-IV of the liquid crystal display shown in FIG. 2;
5 is a cross-sectional view taken along the line VV of the liquid crystal display shown in FIG. 2;
FIG. 6 is a sectional view taken along line VI-VI of the liquid crystal display shown in FIG. 2;

DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, embodiments of the present invention will be described with reference to the drawings.

1 is an exploded perspective view showing a liquid crystal display device according to an embodiment of the present invention. The liquid crystal display device has a liquid crystal display panel 10. The liquid crystal display panel 10 is supported by the upper frame 12 and the lower frame 14.

FIG. 2 is a plan view illustrating a pixel electrode, a common electrode, and a circuit layer of the liquid crystal display shown in FIG. 1. FIG. 3 is a cross-sectional view taken along line III-III of the liquid crystal display shown in FIG. 2. 4 is a cross-sectional view taken along the line IV-IV of the liquid crystal display shown in FIG. 2. FIG. 5 is a cross-sectional view taken along the line V-V of the liquid crystal display shown in FIG. 2. FIG. 6 is a sectional view taken along the line VI-VI of the liquid crystal display shown in FIG. 2.

The liquid crystal display device has a pixel electrode 80 and a common electrode 70. The pixel electrode 80 and the common electrode 70 each consist of a transparent conductive film. The pixel electrode 80 and the common electrode 70 are laminated via the interlayer insulating film 48 to drive the liquid crystal 20 in a transverse electric field driving method. The pixel electrode 80 is disposed on the liquid crystal 20 side of the interlayer insulating film 48.

The liquid crystal display device has a color filter 100. The color filter 100 includes the plurality of colored layers 102, 104, 106 of different colors (see FIG. 4). The light transmittances of the colored layers 102, 104, and 106 are respectively different. The plurality of colored layers 102, 104, 106 include a red colored layer 102.

The liquid crystal display device has a circuit layer 40. The circuit layer 40 is disposed below the liquid crystal 20, the pixel electrode 80, and the common electrode 70. The circuit layer 40 includes a thin film transistor. As shown in FIG. 3, the thin film transistor includes a gate electrode 30, a source electrode 54, a drain electrode 52, and a semiconductor layer 60. The circuit layer 40 includes a gate insulating film 42 covering the gate electrode 30. The source electrode 54 and the drain electrode 52 are formed on the semiconductor layer 60 to be in contact with each other. A part of the common electrode 70 is located above the gate electrode 30.

The circuit layer 40 includes a plurality of wirings made of metal. The plurality of wirings include a common wiring 56 (see FIGS. 4 and 5). The common wiring 56 is formed to contact the semiconductor layer 60. A part of the common wiring 56 is located above the gate electrode 30. As shown in FIG. 4, the common wiring 56 is any other colored layer, avoiding opposing the green colored layer 104 having the highest light transmittance among the plurality of colored layers 102, 104, and 106. It is arrange | positioned so that it may face to (as opposed to the red colored layer 102 in this embodiment).

According to this embodiment, since the common wiring 56 made of metal avoids facing the green colored layer 104 having the highest luminance, the luminance of light shielded by the metal wiring is originally low, and thus the liquid crystal display device. The fall of the brightness | luminance can be suppressed.

As shown in FIG. 5, the liquid crystal display device has a connection wiring 82. The connection wiring 82 connects the common electrode 70 and the common wiring 56. The connection part with the common electrode 70 of the connection wiring 82 is located above the gate electrode 30. The connection part of the connection wiring 82 with the common wiring 56 is located above the gate electrode 30. The connection wiring 82 is made of a transparent electrode film, and has a portion parallel to the pixel electrode 80 on the interlayer insulating film 48, and a portion connecting the common electrode 70 through the interlayer insulating film 48.

[Example]

Hereinafter, more specific content of embodiment of this invention is described.

The liquid crystal display panel 10 has a first substrate 16 and a second substrate 18. Both the first substrate 16 and the second substrate 18 are transparent substrates (for example, glass substrates). The liquid crystal 20 is disposed between the first substrate 16 and the second substrate 18. The polarizing plate 22 is bonded to the 1st board | substrate 16 and the 2nd board | substrate 18 in the cross nicol state on the surface on the opposite side to the liquid crystal 20, respectively.

A thin film transistor is formed on the surface of the first substrate 16 that faces the liquid crystal 20. The thin film transistor is a switch for controlling the driving of the liquid crystal 20. The thin film transistor has a bottom gate type in which a gate electrode 30 to which a control scan voltage is applied is disposed below. The gate electrode 30 is formed on the first substrate 16. A gate insulating film 42 made of an inorganic material (semiconductor oxide such as SiO 2 or semiconductor nitride such as SiN) is formed to cover the gate electrode 30 by plasma CVD or the like. On the gate insulating film 42, for example, a semiconductor layer 60 made of amorphous silicon or microcrystalline silicon is formed. On the semiconductor layer 60, a source electrode 54 to which pixel potential is output and a drain electrode 52 to which an image signal is applied are formed. A protective insulating layer 44 made of an inorganic material (a semiconductor oxide such as SiO 2 or a semiconductor nitride such as SiN) is formed to cover the source electrode 54, the drain electrode 52, and the semiconductor layer 60. Moisture contamination of the semiconductor layer 60 is prevented by the protective insulating layer 44.

When the gate voltage is applied to the gate electrode 30, the resistance of the semiconductor layer 60 between the drain electrode 52 and the source electrode 54 to which the image signal voltage is applied is lowered, thereby causing the source electrode 54 to fall. An electric field is generated between the pixel electrode 80 which is the connected second transparent conductive film and the common electrode 70 which is the first transparent conductive film to which the common voltage is applied, which is applied to the liquid crystal 20 to The transmittance is changed to display.

Since the gate electrode 30, the drain electrode 52, and the source electrode 54 need low resistance as a wiring material, a conductive material made of Cu (copper) or Cu and Mo (molybdenum) thereunder by the sputtering method. Form a film.

The organic insulating film 46 is disposed above the thin film transistor (on the protective insulating layer 44). The organic insulating film 46 is a low dielectric constant film having a relative dielectric constant of 4 or less.

The common electrode 70 is formed on the organic insulating layer 46. An interlayer insulating film 48 is formed on the common electrode 70. The interlayer insulating film 48 is composed of an insulating film of an inorganic material such as SiN. In addition, a pixel electrode 80 formed of a second transparent conductive film is formed thereon. The common electrode 70 and the pixel electrode 80 are formed of ITO (indium tin oxide) or indium zinc oxide by the sputtering method or the like.

The pixel electrode 80 in the pixel region is connected to the source electrode 54 through the openings of the interlayer insulating film 48, the common electrode 70, the organic insulating film 46, and the protective insulating layer 44. The pixel potential is supplied to the liquid crystal 20 by this. The display is performed by applying an electric field between the pixel electrode 80 and the interlayer insulating film 48 between the common potential of the common electrode 70 present below to the liquid crystal 20.

The black matrix 130 is arrange | positioned at the surface of the direction of the liquid crystal 20 in the 2nd board | substrate 18 in the position which opposes the 1st board | substrate 16 with respect to the liquid crystal 20. As shown in FIG. The black matrix 130 is made of a resin containing black pigment and carbon. The black matrix 130 prevents light propagation to the channel region of the semiconductor layer 60. Therefore, the planar shape of the black matrix 130 is island shape or stripe shape.

The color filter 100 is formed on the black matrix 130 toward the liquid crystal 20. The color filter 100 consists of a plurality of colored layers (for example, three colors of red, green, and blue). The color filter 100 in the cross-sectional structure of FIG. 3 is a colored layer in which red pigment is dispersed.

In addition, an overcoat film 120 made of an organic material covering the surface of the second substrate 18 facing the liquid crystal 20 is formed. The overcoat film 120 is made of a transparent material without including a pollutant source in which a pigment or the like is ionized and dissolved in the liquid crystal 20.

FIG. 4 is a cross-sectional structure of three consecutive pixels along the extending direction of the gate electrode 30 (see FIG. 2) of the liquid crystal display panel in which three colored layers are arranged in a vertical stripe on the second substrate 18. . With respect to the extending direction of the gate electrode 30, the second substrate 18 is provided with a red colored layer 102 including a red pigment, a green colored layer 104 including a green pigment, and a blue pigment. The blue colored layer 106 to contain is formed. The boundary of each pixel is the drain electrode 52 on the first substrate 16 with the liquid crystal 20 interposed therebetween, and the black matrix 130 on the second substrate 18.

The liquid crystal 20 is driven by an electric field applied between the common electrode 70 made of the first transparent conductive film made of indium tin oxide (ITO) and the pixel electrode 80 made of the second transparent conductive film made of ITO. do. At this time, the drain electrode 52 propagates video signals other than the corresponding pixels and generates a noise electric field, but the common electrode 70 is always applied with a common voltage, and the common electrode 70 is the drain electrode 52. ) Serves as a shield electrode from the top through the organic insulating film 46 of low dielectric constant. As a result, the interval between adjacent pixel electrodes 80 can be shortened with the drain electrode 52 interposed therebetween, whereby the width of the black matrix 130 partitioning each pixel can be shortened, resulting in a high opening ratio.

Since the common electrode 70 is made of a transparent conductive film such as ITO, the resistance is high. Therefore, when the liquid crystal display device becomes large, the potential of the common electrode 70 is delayed. For that reason, conventionally, a low resistance wiring material such as Cu (copper) is successively formed by sputtering in a step after the common electrode 70, and patterned on the transparent common electrode 70 by Was forming.

However, sputtering of low resistance wiring such as Cu has a problem that the process is newly increased because the devices of the common electrode 70 of ITO are different from each other.

In the present embodiment, the common wiring 56 formed by the same process as the drain electrode 52 is formed at the position where the two drain electrodes 52 serving as pixel regions are inserted in the pixel having the red colored layer 102 of FIG. 4. It is arranged. The common wiring 56 is not formed in the pixel areas of the other green colored layer 104 and the blue colored layer 106. As can be seen from the plan view of Fig. 2, in the liquid crystal display device which realizes color display by the three-color color filter method, it is formed only in the pixel region of one colored layer. As shown in FIG. 3, the common electrode 70 is disposed to cover the drain electrode 52 of the pixel region, and the common wiring 56 may be formed on all pixels even with a relatively high resistance conductive material such as ITO. It does not need to be necessary and just arrange | positions one by the minimum unit of a colored layer.

Therefore, when the color filter is composed of three color layers of red, green, and blue, one pixel area among the three pixel areas, and the color filter is a color layer of four colors of red, green, blue, and yellow, or In the case of four colored layers of red, green, sulfur, and white, one pixel area in four pixel areas, and five of the colored filters of five color layers of red, green, blue, yellow, and cyan The common wiring 56 may be formed in one pixel area in the pixel area.

In this embodiment having three color filters 100 of red, blue, and green, the common wiring 56 is disposed in the pixel region where the red colored layer 102 is formed, as shown in FIG. This is based on the following factors which realize a high opening rate.

First, the difference is the transmittance of each color. When the color filter 100 of red, green, and blue is used in a liquid crystal display device, the transmittance | permeability is high in order of green, red, and blue including the transmittance | permeability of the pigment mixed in a colored layer. In this embodiment, when white is displayed in the entire screen, that is, when the transmittance of each pixel of red, green, and blue is maximized, it is set to 500 cd / m 2. Among them, the green pixel is 344 cd / m 2, the red pixel is 98 cd / m 2, and the blue pixel is 58 cd / m 2. As can be seen from this, in the case where the common wiring 56 is disposed in the green pixel, the white luminance is the lowest and the liquid crystal display is dark, and the power consumption is increased to compensate for this, which is not preferable.

In addition, in a present Example, the thickness of a colored layer differs for every color. As shown in FIG. 4, the blue colored layer 106 is set thicker than the colored layer of another color. This is because the sub-refractive transmittance of the liquid crystal 20 shows wavelength dependence. Blue light has a short wavelength. Therefore, when the thickness of the colored layer of each color is made the same, the transmittance | permeability of the pixel area of blue light becomes small at the same drive voltage. This lowers the brightness of the liquid crystal display device. For this reason, it is set to thicken the blue colored layer 106 and to make the cell gap of a liquid crystal material thin. In order to maintain the cell gap which is the thickness of the liquid crystal 20 which is the gap between the 1st board | substrate 16 and the 2nd board | substrate 18, the colored layer of each color of the 2nd board | substrate 18 is overlapped. The overlap region is located in the pixel of thick blue colored layer. Corresponding to the portion where the red colored layer 102, the green colored layer 104 and the blue colored layer 106 of the color filter 100 overlap, the first substrate 16 has a pedestal electrode ( 58) is formed. The pedestal electrode 58 is formed on the gate electrode 30 which is the light shielding region. The cross-sectional structure is shown in FIG.

Since the pedestal electrode 58 is formed in the gate electrode 30 of the blue pixel, the common wiring 56 cannot form a wiring region across the gate electrode 30. Therefore, the common wiring 56 is formed in the pixel region in which the red colored layer 102 is formed in this embodiment.

In this embodiment, as described above, the common wiring 56 is arranged in the pixel region of one color of the three-color colored layer, and the green colored layer 104 having a high transmittance of the color filter 100 arranged therein is provided. By arranging the pixels in the red colored layer 102 having a low transmittance rather than the pixel region, high aperture ratio can be achieved, white luminance can be increased, and low power consumption can be realized.

5 is a cross-sectional view taken along the line V-V in FIG. 2. This cross section shows a connection area between the common wiring 56 and the common electrode 70. This connection area occupies a larger area than the common wiring 56 of the transmissive area of the pixel to form a connection opening. Therefore, the black matrix 130 is formed and the connection region is formed on the light-shielding gate electrode 30. This increases the aperture ratio. This is one of the features for realizing a high opening ratio in this embodiment.

The common wiring 56 and the common electrode 70 are connected as follows. The common wiring 56 that crosses the gate electrode 30 of the pixel on which the red colored layer 102 is formed includes a protective insulating layer 44 covering the common wiring 56, an organic insulating film 46, and an interlayer insulating film ( It connects to the connection wiring 82 formed with the 2nd transparent conductive film in the same process as the pixel electrode 80 through the 1st opening 64 of 48. FIG. Next, this connection wiring 82 is connected to the common electrode 70 through the second opening 66 of the interlayer insulating film 48 covering the common electrode 70. Thereby, the wiring delay of the common electrode 70 is reduced, and favorable image quality is obtained. In addition, these connection regions are formed on the opaque gate electrode 30 so as not to lower the aperture ratio, and can provide a liquid crystal display device that is bright with high opening ratio and low power consumption.

FIG. 6 is a cross-sectional view taken along the line VI-VI of FIG. 2. This cross-sectional view shows a structure for fixing the thickness of the liquid crystal 20 between the first substrate 16 and the second substrate 18. As for the blue colored layer 106, the red colored layer 102 and the green colored layer 104 are patterned, and the relative step becomes high. In addition, the pedestal electrode 58 is formed on the semiconductor layer 60 in the same process as the drain electrode 52 in the 1st board | substrate 16, and the thickness of the liquid crystal 20 is determined by this.

As described above, in the present embodiment, the transparent common electrode 70 of the liquid crystal display panel 10 is connected to the low resistance common wiring 56 in order to realize the low resistance. Since the common wiring 56 is light impermeable, in the pixel areas of the red, green, and blue colored layers, the common wiring 56 is disposed only in the region of the red colored layer 102, avoiding the green colored layer 104 having the maximum transmittance. It is. In addition, by providing a connection region between the common wiring 56 and the common electrode 70 on the gate electrode 30, a liquid crystal display device having low power consumption with a high opening ratio can be provided. In this embodiment, although it further has a structure (for example, an alignment film) of a well-known liquid crystal display device, the detailed description is abbreviate | omitted.

The present invention is not limited to the above-described embodiment, but various modifications are possible. For example, the structure demonstrated in embodiment can be substituted by the structure which can substantially achieve the same structure, the same effect, or the same objective.

10 liquid crystal display panel
12: upper frame
14: lower frame
16: first substrate
18: second substrate
20: liquid crystal
22: polarizing plate
30: gate electrode
40: circuit layer
42: gate insulating film
44: protective insulating layer
46: organic insulating film
48: interlayer insulation film
52: drain electrode
54: source electrode
56: common wiring
58: pedestal electrode
60: semiconductor layer
64: first opening
66: second opening
70: common electrode
80 pixel electrode
82: connection wiring
100: color filter
102: red colored layer
104: green colored layer
106: blue colored layer
120: overcoat film
130: black matrix

Claims (10)

  1. With liquid crystal,
    A thin film transistor and a plurality of wirings, wherein the plurality of wirings comprises a circuit layer made of metal;
    A pixel electrode and a common electrode each made of a transparent conductive film, laminated with an insulating film between the liquid crystal and the circuit layer to drive the liquid crystal in a transverse electric field driving method;
    A color filter comprising a plurality of colored layers of different colors, each having a light transmittance of each colored layer,
    Connection wiring
    Lt; / RTI &
    The plurality of wirings include common wirings arranged to face any of the other colored layers, avoiding facing the colored layers having the highest light transmittance among the plurality of colored layers.
    The said connection wiring connects the said common electrode and the said common wiring, The liquid crystal display device characterized by the above-mentioned.
  2. The method of claim 1,
    The thin film transistor has a gate electrode, a source electrode and a drain electrode,
    Part of the common electrode and part of the common wiring are respectively located above the gate electrode,
    A connecting portion of the connecting wiring with the common electrode and a connecting portion of the connecting wiring with the common wiring are located above the gate electrode, respectively.
  3. The method of claim 2,
    The circuit layer includes a semiconductor layer,
    The source electrode, the drain electrode, and the common wiring are each formed on the semiconductor layer so as to be in contact with each other.
  4. 4. The method according to any one of claims 1 to 3,
    The pixel electrode is disposed on the liquid crystal side of the insulating film,
    And said connecting wiring is made of said transparent conductive film, and has a portion parallel to said pixel electrode on said insulating film, and a portion connecting said common electrode through said insulating film.
  5. 4. The method according to any one of claims 1 to 3,
    The plurality of colored layers includes a red colored layer,
    The common wiring is disposed so as to face the red colored layer.
  6. The method of claim 5,
    The plurality of colored layers includes a blue colored layer,
    The said blue colored layer is formed thicker than the said colored layer of another color, The liquid crystal display device characterized by the above-mentioned.
  7. The method according to claim 6,
    The plurality of colored layers includes a green colored layer,
    The said common wiring is arrange | positioned avoiding facing the said green colored layer, The liquid crystal display device characterized by the above-mentioned.
  8. 4. The method according to any one of claims 1 to 3,
    The common wiring is made of a metal having a lower resistance than the transparent conductive film.
  9. The method of claim 2,
    The source electrode is electrically connected to the pixel electrode.
  10. 10. The method according to claim 2 or 9,
    Have more black matrix,
    The liquid crystal display device characterized in that the drain electrode is arranged on one side with the liquid crystal interposed between the pixels, and the black matrix is arranged on the other side.
KR1020100106894A 2009-10-30 2010-10-29 Liquid crystal display device KR101205127B1 (en)

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Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR100701474B1 (en) 2000-06-09 2007-03-29 샤프 가부시키가이샤 Defect correcting method for liquid crystal panal
JP2009168878A (en) 2008-01-11 2009-07-30 Epson Imaging Devices Corp Liquid crystal device and electronic equipment
JP2010160382A (en) 2009-01-09 2010-07-22 Epson Imaging Devices Corp Liquid crystal display device

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR100701474B1 (en) 2000-06-09 2007-03-29 샤프 가부시키가이샤 Defect correcting method for liquid crystal panal
JP2009168878A (en) 2008-01-11 2009-07-30 Epson Imaging Devices Corp Liquid crystal device and electronic equipment
JP2010160382A (en) 2009-01-09 2010-07-22 Epson Imaging Devices Corp Liquid crystal display device

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