KR102047727B1 - Touch sensor in-cell type liquid crystal display device and method of fabricating the same - Google Patents

Touch sensor in-cell type liquid crystal display device and method of fabricating the same Download PDF

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Publication number
KR102047727B1
KR102047727B1 KR1020120157722A KR20120157722A KR102047727B1 KR 102047727 B1 KR102047727 B1 KR 102047727B1 KR 1020120157722 A KR1020120157722 A KR 1020120157722A KR 20120157722 A KR20120157722 A KR 20120157722A KR 102047727 B1 KR102047727 B1 KR 102047727B1
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South Korea
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touch
pixel
wiring
electrode
liquid crystal
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KR1020120157722A
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Korean (ko)
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KR20140087431A (en
Inventor
유재성
신희선
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엘지디스플레이 주식회사
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    • G—PHYSICS
    • G02—OPTICS
    • G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
    • G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
    • G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour 
    • G02F1/13—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour  based on liquid crystals, e.g. single liquid crystal display cells
    • G02F1/133—Constructional arrangements; Operation of liquid crystal cells; Circuit arrangements
    • G02F1/136—Liquid crystal cells structurally associated with a semi-conducting layer or substrate, e.g. cells forming part of an integrated circuit
    • G02F1/1362—Active matrix addressed cells
    • G02F1/1368—Active matrix addressed cells in which the switching element is a three-electrode device
    • 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
    • G02F1/13338—Input devices, e.g. touch panels
    • G—PHYSICS
    • G02—OPTICS
    • G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
    • G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
    • G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour 
    • G02F1/13—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour  based on liquid crystals, e.g. single liquid crystal display cells
    • G02F1/133—Constructional arrangements; Operation of liquid crystal cells; Circuit arrangements
    • G02F1/1333—Constructional arrangements; Manufacturing methods
    • G02F1/1343—Electrodes
    • G—PHYSICS
    • G06—COMPUTING; CALCULATING OR COUNTING
    • G06F—ELECTRIC DIGITAL DATA PROCESSING
    • G06F3/00—Input arrangements for transferring data to be processed into a form capable of being handled by the computer; Output arrangements for transferring data from processing unit to output unit, e.g. interface arrangements
    • G06F3/01—Input arrangements or combined input and output arrangements for interaction between user and computer
    • G06F3/03—Arrangements for converting the position or the displacement of a member into a coded form
    • G06F3/041—Digitisers, e.g. for touch screens or touch pads, characterised by the transducing means

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  • Physics & Mathematics (AREA)
  • Nonlinear Science (AREA)
  • Engineering & Computer Science (AREA)
  • General Physics & Mathematics (AREA)
  • Mathematical Physics (AREA)
  • Crystallography & Structural Chemistry (AREA)
  • Chemical & Material Sciences (AREA)
  • Optics & Photonics (AREA)
  • General Engineering & Computer Science (AREA)
  • Theoretical Computer Science (AREA)
  • Liquid Crystal (AREA)
  • Microelectronics & Electronic Packaging (AREA)
  • Human Computer Interaction (AREA)

Abstract

The present invention provides a display device comprising: gate and data lines formed to cross each other at a boundary of each pixel region on a substrate on which a plurality of touch blocks that group a plurality of pixel regions in a display region are defined; A thin film transistor connected to the gate and data line in each pixel area; A pixel electrode connected to the drain electrode of the thin film transistor and formed in each pixel region; A touch wiring formed in one direction between the pixel electrodes corresponding to a boundary of the pixel area; A first protective layer formed over the pixel electrode and the touch wiring; A plurality of first openings having a bar shape are formed on the first passivation layer for each touch block, and a plurality of first openings having a bar shape correspond to each pixel area, and a second opening is formed with respect to the touch wiring in the same shape as the first opening. The present invention provides an array substrate for a touch in-cell type liquid crystal display device including a common electrode.

Description

Touch sensor in-cell type liquid crystal display device and method of fabricating the same}

The present invention relates to a liquid crystal display device, and more particularly, to an array substrate for a touch sensor in-cell type liquid crystal display device capable of improving touch sensitivity by minimizing capacitance due to touch wiring.

Recently, liquid crystal displays have been spotlighted as next generation advanced display devices having low power consumption, good portability, high technology value, and high added value.

Among the liquid crystal display devices, an active matrix liquid crystal display device having a thin film transistor, which is a switching element that can control voltage on and off for each pixel, has the best resolution and video performance. I am getting it.

In general, an LCD device forms an array substrate and a color filter substrate through an array substrate manufacturing process for forming a thin film transistor and a pixel electrode, and a color filter substrate manufacturing process for forming a color filter and a common electrode, and between the two substrates. It completes through the cell process through liquid crystal in the process.

In more detail, referring to FIG. 1, which is an exploded perspective view of a general liquid crystal display, the array substrate 10 and the color filter substrate 20 are faced to each other with the liquid crystal layer 30 interposed therebetween. The lower array substrate 10 includes a plurality of gate lines 14 and data lines 16 arranged vertically and horizontally to the top surface of the transparent substrate 12 to define a plurality of pixel regions P. These two lines Thin film transistors T are provided at intersections of the fourteen and sixteenth ones, and one-to-one correspondences are made with the pixel electrodes 18 provided in the pixel regions P. FIG.

In addition, the upper color filter substrate 20 facing the array substrate 10 is a rear surface of the transparent substrate 22, and the non-display of the gate wiring 14, the data wiring 16, the thin film transistor T, and the like. A grid-like black matrix 25 is formed around the pixel region P so as to cover the region, and red (R) and green are sequentially arranged in order to correspond to the pixel region (P) in the grid. A color filter layer 26 including (G) and blue (B) color filter patterns 26a, 26b, and 26c is formed, and is transparent over the entire surface of the black matrix 25 and the color filter layer 26. The common electrode 28 is provided.

Although not shown in the drawings, each of the two substrates 10 and 20 is sealed with a sealant or the like along the edge to prevent leakage of the liquid crystal layer 30 interposed therebetween. 10 and 20 are interposed between upper and lower alignment layers that provide reliability in the molecular alignment direction of the liquid crystal at a boundary portion of the liquid crystal layer 30, and at least one outer surface of each substrate 10 and 20 is provided with a polarizing plate. have.

In addition, a back-light is provided on the outer surface of the array substrate to supply light. The on / off signals of the thin film transistor T are sequentially scanned by the gate wiring 14. When the image signal of the data wiring 16 is transmitted to the pixel electrode 18 of the pixel region P applied and selected, the liquid crystal molecules are driven by the vertical electric field therebetween, and thus the light transmittance is changed. Branch images can be displayed.

The liquid crystal display device having such a configuration is operated in the TN mode, the transverse electric field mode, and the fringe field switching mode for the arrangement method of the pixel electrode and the common electrode.

On the other hand, the liquid crystal display having the above-described configuration is used in a variety of applications such as TV, projector, mobile phone, PDA, etc. These applications are recently equipped with a touch function to operate by touching the screen recently to be.

In this case, the liquid crystal display device having the touch function is referred to as a touch in-cell type liquid crystal display device.

Accordingly, the touch in-cell type liquid crystal display device having a touch function as compared to a general liquid crystal display device without a touch function is an example of the above-described components. Configuration is required.

FIG. 2 is a plan view of a portion of a display area in a conventional array substrate for a liquid crystal display device with a built-in touch function, showing touch wiring and peripheral components thereof, and FIG. 3 is a cut line III-III of FIG. FIG. 3 is a cross-sectional view of the cut portion and shows only a portion where the pixel electrode and the common electrode are formed.

As shown, the touch wiring extends in one direction, and the common electrode 65 having a plurality of bar-shaped openings (ops) corresponding to each pixel area is separately formed for each teach block. have.

In this case, the touch wiring 56 is formed on the first passivation layer 50 as an example of the same component in which the pixel electrode 53 is formed, and the second passivation layer 60 is disposed on the pixel electrode 53. The common electrode 65 is formed therebetween.

On the other hand, as described above, the pixel electrode 53 and the common electrode 65 are provided on the lower and upper portions of the second protective layer 60 to form a configuration in which the two electrodes 53 and 65 face each other. The array substrate 90 serves as the fringe field switching mode liquid crystal display array substrate 90.

The array substrate 90 for a liquid crystal display device having such a structure has the thickness of the second protective layer 60 to be as thin as possible to improve display performance as a display device, and at the same time, the pixel electrode 53 using a material having a high dielectric constant. And a storage capacity implemented by the second passivation layer 60 and the common electrode 65.

However, in view of touch performance, the second protective layer 60 should be made of a thick material having a small dielectric constant to reduce the parasitic capacitance load caused by the touch wiring 56 and the common electrode 65 overlapping the touch layer 56. Signal level).

Therefore, when a touch in-cell type liquid crystal display array substrate is implemented by using a configuration of an array substrate for a liquid crystal display device operating in a conventional fringe field switching mode, there is a problem in that touch sensitivity is lowered.

In order to solve the above problems, in the present invention, the storage capacitance between the common electrode and the pixel electrode reduces the parasitic capacitance generated between the touch wiring and the common electrode while maintaining the level of a general fringe field switching mode liquid crystal display substrate. It is an object of the present invention to provide an array substrate for a touch in-cell type fringe field switching mode liquid crystal display device that can be improved.

In order to achieve the above object, an array substrate for a touch in-cell type fringe field switching mode liquid crystal display device according to an exemplary embodiment of the present invention may include pixels on a substrate on which a plurality of touch blocks in which a plurality of pixel regions are grouped in a display region are defined. Gate and data lines formed to cross each other at the boundary of the region; A thin film transistor connected to the gate and data line in each pixel area; A pixel electrode connected to the drain electrode of the thin film transistor and formed in each pixel region; A touch wiring formed in one direction between the pixel electrodes corresponding to a boundary of the pixel area; A first protective layer formed over the pixel electrode and the touch wiring; A plurality of first openings having a bar shape are formed on the first passivation layer for each touch block, and a plurality of first openings having a bar shape correspond to each pixel area, and a second opening is formed with respect to the touch wiring in the same shape as the first opening. It includes a common electrode characterized in that formed.

In this case, the second opening is formed to be spaced apart from each pixel area by the number of pixel areas arranged in the longitudinal direction of the second opening in the common electrode positioned in one touch block.

The touch wiring is formed to overlap the data wiring or the gate wiring.

In addition, the touch wiring is connected to the common electrode provided in any one of the touch block of each of the touch block, wherein the first protective layer is provided with a touch contact hole for exposing the touch wiring, the touch contact The touch wires and the common electrode provided in any one of the touch blocks through the holes are in contact with each other.

A second protective layer covering the thin film transistor and having a flat surface is formed. The pixel electrode and the touch wiring are formed on the second protective layer, and the drain electrode of the thin film transistor is formed on the second protective layer. A drain contact hole for exposing is provided, and the pixel electrode and the drain electrode contact each other through the drain contact hole.

The array substrate for the touch in-cell type fringe field switching mode liquid crystal display according to the exemplary embodiment of the present invention reduces the overlap area between the common electrode and the touch wiring provided in each touch block, thereby reducing the touch wiring and the common electrode in the touch block. The parasitic capacitance due to overlapping is reduced, and the capacitance load between the touch blocks is reduced.

In addition, when the capacitance load between the touch wire and the common electrode in the other touch block is reduced, the number of touch sensing can be reduced by increasing the signal level (touch sensitivity) generated when the user touches, thereby reducing driving power. .

In addition, the touch driving time can be reduced by reducing the number of touch sensing, and thus the touch in-cell type fringe field switching mode liquid crystal display device having a large display area can be realized.


1 is an exploded perspective view of a general liquid crystal display device.
FIG. 2 is a plan view of a portion of a display area in a liquid crystal display array substrate having a conventional touch function and showing touch wiring and peripheral components thereof. FIG.
3 is a cross-sectional view of a portion taken along the cutting line III-III of FIG. 2 and illustrates only a portion where a pixel electrode and a common electrode are formed.
4 is a schematic plan view of a portion of a display area of an array substrate for a touch in-cell type liquid crystal display according to an exemplary embodiment of the present invention.
FIG. 5 is an enlarged view of area A of FIG. 4; FIG.
FIG. 6 is a cross-sectional view of a portion cut along the cutting line VI-VI in FIG. 5; FIG.

Hereinafter, preferred embodiments of the present invention will be described with reference to the drawings.

4 is a schematic plan view of a portion of a display area of an array substrate for a touch in-cell type liquid crystal display according to an exemplary embodiment of the present invention, FIG. 5 is an enlarged view of area A of FIG. 4, and FIG. It is sectional drawing about the part cut along the cutting line VI-VI.

As shown, in the array substrate 101 for a touch in-cell type liquid crystal display device according to the embodiment of the present invention, the display area is configured to include a plurality of pixel areas (P).

In addition, the display area including the plurality of pixel areas P is blocked by forming a plurality of pixel areas P adjacent to each other up and down as a group to form a touch block TB. A common electrode 170 having a separate shape is formed to correspond to each touch block TB having the region P as a group.

In this way, between the common electrodes 170 separated by the touch blocks TB, the touch wiring for detecting the load change of the capacitance changed during the touch through these common electrodes 170 and transmitting the sensing load to the sensing circuit is lower than the common electrodes 170. The common electrode 170 and the touch wiring 165 separated by each touch block are selectively connected to each other.

That is, when the touch wiring 165 is connected to the common electrode 170 located in the first touch block, for example, by any one touch block TB, for example, the touch contact hole tch. It is not connected to the common electrode 170 of another touch block TB other than the common electrode 170 of the touch block.

That is, the touch wiring 165 has an insulating layer (second protective layer 168) between the common electrodes 170 in the other touch blocks other than the common electrode 170 of the first touch block connected thereto. They are spaced apart from one another and have different voltages.

A touch in-cell type liquid crystal display (not shown) including an array substrate according to an embodiment of the present invention having the above-described configuration displays an image by supplying a common voltage to the common electrode 170 in a display period for displaying an image. In the non-display period in which no image is displayed, the common electrode 170 is used as a touch electrode for detecting a user's touch.

Therefore, when the user touches the display area using a finger, touch capacitance is formed between the common electrodes 170 separated by the touch blocks, and at this time, the touch capacitance according to the user's touch and the reference capacitance are compared. The touch position of the user can be detected, and an operation according to the detected touch position is performed.

At this time, by comparing the touch capacitance and the reference capacitance to recognize the coordinates of the portion where the user's touch occurs, the operation appears in the coordinates of the touch generating portion.

Accordingly, the touch wiring 165 is a medium for transferring the change in capacitance from the common electrode 170 divided by the TB blocks to the sensing circuit unit (not shown) provided in the non-display area or the printed circuit board. Since the touch wiring 165 is connected to any one of the common electrodes 170 separated for each touch block, the touch wiring 165 may not be formed on the same layer on which the common electrodes 170 are formed and should be insulated. Therefore, the pixel electrode 160 is formed on the same layer.

In this case, a capacitor is formed by forming a first electrode / dielectric layer / second electrode with the common electrode 170 provided in the other touch block TB other than the touch wiring 165 and the common electrode 170 connected thereto. Will be achieved.

Therefore, the capacitance generated between the touch wiring 165 and the common electrode 170 acts as a factor to reduce the touch sensitivity by being an obstacle to detecting the change in touch capacitance between neighboring touch blocks TB. .

Therefore, in the array substrate 101 for the touch in-cell type fringe field switching mode liquid crystal display device according to the embodiment of the present invention, the common electrode 170 separated by each touch block TB is the touch wiring as the most characteristic configuration. The second opening of the bar shape (bqr) is the same as the first opening op1 having the plurality of bar shapes corresponding to each pixel area P corresponding to the portion overlapping with the 165. One feature is that it is provided with (op2).

In this case, the second opening op2 is disposed in the same touch block TB in the longitudinal direction of the second opening op2 in the common electrode 170 located in one touch block TB. It is characterized in that formed by separating the pixel area (P) by the number of the area (P).

In the portion where the common electrode 170 overlaps the touch wiring 165, a bar shape is partially provided with a second opening op2, so that the touch wiring 165 may be disposed within each touch block. Since the overlapping portion of the common electrode 170 is significantly reduced, it is caused by the insulating layer (the second protective layer 168) interposed between these two components 165 and 170 and the two driving elements 165 and 170. Capacitance to be reduced can be reduced. As shown in the drawing, the width of the second opening op2 is preferably wider than the width of the touch wiring 165.

In this case, it is one touch block TB that does not form a bar-shaped second opening op2 with respect to the touch wiring 165 in the common electrode 170 formed in each of the touch blocks TB. ), The common electrode 170 provided in FIG. 1 must maintain an electrically connected state, and when the second opening op2 is formed to correspond to all parts corresponding to the touch wiring 165, each touch block TB One common electrode 170 provided therein is intended to prevent this because it is separated in the touch block TB.

On the other hand, when each common electrode 170 has the structure described above, the pixel electrode 160 and the common electrode 170 overlapping each other in the pixel region P are arranged in a common fringe field switching mode liquid crystal display device array. Since there is no change compared to the substrate (not shown), the fringe field is formed by the voltage difference applied between the two components 160 and 170, and the storage capacitance implemented by the insulating layer together with these two components Since there is no change, even if a second opening op2 having a bar shape is further provided with respect to the touch wiring 165, the display quality is not a problem.

Hereinafter, the configuration of the array substrate for the in-cell fringe field switching mode liquid crystal display device according to the embodiment of the present invention will be described in more detail.

In the display area of the in-cell type fringe field switching mode liquid crystal display array substrate 101 according to the embodiment of the present invention, a plurality of gate lines 103 extending in one direction, the plurality of gate lines 103 and A plurality of data lines 130 defining a plurality of pixel regions P are formed to cross each other.

In addition, each pixel area P defined as an area surrounded by the plurality of gate lines 103 and the data lines 130 is connected to the gate and data lines 103 and 130 defining the switching element. As a result, a thin film transistor Tr is formed.

In this case, the thin film transistor Tr includes a gate electrode 107, a gate insulating layer 110, an active layer 120a of pure amorphous silicon, and an ohmic contact layer 120b of impurity amorphous silicon. And source and drain electrodes 133 and 136 spaced apart from each other on the semiconductor layer 120 or an oxide semiconductor material in place of the double layer semiconductor layer 120 made of pure and impurity amorphous silicon. An oxide semiconductor layer (not shown) having a single layer structure includes a gate electrode 107, a gate insulating layer 110, an oxide semiconductor layer (not shown), an etch stopper (not shown), and the etch stopper. It may be composed of a source electrode 133 and a drain electrode 136 spaced apart from each other (not shown) and in contact with the oxide semiconductor layer (not shown), respectively.

The thin film transistor Tr constituting such a structure has a bottom gate type structure in which the gate electrode 107 is located at the lowermost portion.

Meanwhile, the thin film transistor Tr may be configured to have a top gate structure by including a polysilicon semiconductor layer (not shown) at the bottom of the substrate 101.

In this case, the thin film transistor Tr may include a semiconductor layer (not shown) including an active region (not shown) of pure polysilicon, a source and a drain region (not shown) of polysilicon doped with impurities on both sides thereof, and a gate. An interlayer insulating film having an insulating film (not shown), a gate electrode (not shown) overlapping the active region (not shown), and a semiconductor layer contact hole (not shown) exposing the source and drain regions (not shown) (Not shown) and source and drain electrodes (not shown) formed in contact with the source and drain regions (not shown), respectively, and spaced apart from each other through the semiconductor layer contact holes (not shown).

When the thin film transistor Tr forms the top gate structure, an interlayer insulating film (not shown) is further provided as compared to the bottom gate structure, and the gate wiring 103 is provided on the gate insulating film (not shown). 130 is formed on the interlayer insulating film (not shown).

Meanwhile, the first protective layer includes a drain contact hole 143 exposing the drain electrode 136 of the thin film transistor Tr over the thin film transistor Tr having the above-described structure and made of an organic insulating material, for example, photoacrylic. 140 is provided to form a flat surface.

In addition, the pixel electrode 160 having a plate shape is formed in the pixel region P on the first passivation layer 140 through the drain contact hole 143. The drain electrode 136 of the thin film transistor Tr is formed on the first passivation layer 140. ) And one touch wiring 165 is formed in one direction for each touch block TB to correspond to one boundary between the pixel areas P.

In the array substrate 101 for a touch in-cell type fringe field switching mode liquid crystal display device according to an exemplary embodiment of the present invention, the touch wiring 165 is provided in the touch block TB. Although it is shown to overlap with any one of the data wires 130, the touch wires 165 are parallel to the gate wires 103 along the direction of the first opening op1 provided in the common electrode 170. The gate line 103 may overlap the gate line 103.

In this case, the touch wiring 165 may be made of the same conductive material constituting the pixel electrode 160, or may be made of a low resistance metal material constituting the gate or data lines 105 and 130.

In addition, a second protective layer 168 made of an inorganic insulating material, for example, silicon oxide (SiO 2 ) or silicon nitride (SiNx), is formed on the pixel electrode 160 and the touch wiring 165. In this case, the second protective layer 168 is provided with a touch contact hole (not shown) for exposing the touch wiring 165 for each touch block TB.

In addition, an upper portion of the second passivation layer 168 is separated for each touch block TB and provided in each touch block TB to contact the touch wiring 165 through the touch contact hole (not shown). The common electrode 170 is formed.

The common electrode 170 separately formed for each touch block TB may include a plurality of first openings having a bar bqr shape corresponding to each of the plurality of pixel areas P provided in each touch block TB. op1) is composed of spaced apart.

 Furthermore, the most characteristic configuration of the array substrate 101 for the touch in-cell type fringe field switching mode liquid crystal display device according to the exemplary embodiment of the present invention is that each of the common electrodes 170 is separately formed for each touch block TB. The second opening op2 having the same bar shape as the first opening op1 corresponds to the touch wiring 165 formed through the touch block TB and formed at the boundary of the pixel area P. It is characterized by being provided.

The array substrate 101 for a touch in-cell fringe field switching mode liquid crystal display device according to an exemplary embodiment of the present invention has a common electrode 170 and a touch wiring line provided in each touch block TB according to the above-described configuration. 165) can be significantly reduced.

Accordingly, since parasitic capacitance due to overlapping of the touch wiring 165 and the common electrode 170 in each touch block TB can be reduced, capacitance loads between the touch blocks TB are reduced.

When the capacitance load between the touch wiring 165 and the common electrode 170 in the other touch block TB is reduced, the signal level (touch sensitivity) generated when the user touches is increased, and in this case, the number of touch sensing Since it can be reduced, it has the effect of reducing the driving power.

In addition, the touch driving time can be reduced by reducing the number of touch sensing, and thus the touch in-cell type fringe field switching mode liquid crystal display device having a large display area can be realized.

Experimentally, compared to the array substrate 101 for the touch in-cell type fringe field switching mode liquid crystal display device according to the exemplary embodiment of the present invention, the conventional touch in-cell type fringe field switching mode liquid crystal display in which the second opening is not provided in the common electrode is shown. When measuring the capacitance load between the touch wiring and the common electrode in the device array substrate (90 in FIG. 2), it was found that 62fF per unit pixel region in the comparative example and 32fF in the embodiment of the present invention.

Therefore, it was confirmed experimentally that the embodiment of the present invention has an effect of reducing the capacitance load between the touch wiring and the common electrode by 48% compared to the comparative example.

When the capacitance load values generated between the touch wiring and the common electrode are 0fF, 32fF, and 65fF, the simulation result shows that the signal level (touch sensitivity) is 40A.U., and the capacitance load value is 32fF and For 62fF, 33A.U. And 26A.U.

therefore. When the capacitance load value between the touch wiring and the common electrode according to the comparative example was 100% in the signal level (touch sensitivity), the embodiment of the present invention became 127%, indicating that the signal level was improved by about 26%. have.

The present invention is not limited to the above-described embodiments, and various changes and modifications can be made without departing from the spirit of the present invention.

101: substrate
110: gate insulating film
120: semiconductor layer
120a: active layer
120b: ohmic contact layer
130: data wiring
133: source electrode
136: drain electrode
140: first protective layer
143: drain contact hole
160: pixel electrode
165: touch wiring
168: second protective layer
170: common electrode
Tr: Thin Film Transistor

Claims (8)

Gate and data lines formed to cross each other at a boundary of each pixel region on a substrate on which a plurality of touch blocks that group a plurality of pixel regions in the display region are defined;
A thin film transistor connected to the gate and data line in each pixel area;
A pixel electrode connected to the drain electrode of the thin film transistor and formed in each pixel region;
A touch wiring formed in one direction between the pixel electrodes corresponding to a boundary of the pixel area;
A second protective layer formed over the pixel electrode and the touch wiring;
A plurality of first openings having a bar shape are formed on the second passivation layer for each touch block, and a plurality of first openings having a bar shape correspond to each pixel area. Common electrode characterized by formed
Array substrate for a touch in-cell type liquid crystal display device comprising a.
The method of claim 1,
Wherein the second openings are formed in the common electrode positioned in one touch block and are spaced apart from each pixel area by the number of pixel areas arranged in the longitudinal direction of the second opening. Board.
The method of claim 1,
And the touch wiring overlaps with the data wiring or the gate wiring.
The method of claim 1,
And the touch wiring is connected to a common electrode provided in any one of the touch blocks.
The method of claim 4, wherein
The second protective layer is provided with a touch contact hole exposing the touch wiring, and the common electrode provided in one of the touch blocks of the touch block and the touch block is in contact with each other through the touch contact hole. Array substrate for in-touch in-cell type liquid crystal display device.
The method of claim 1,
A first protective layer covering the thin film transistor and having a flat surface is formed.
The pixel electrode and the touch wiring are formed on the first protective layer,
The first protective layer includes a drain contact hole exposing a drain electrode of the thin film transistor, and the pixel electrode and the drain electrode contact each other through the drain contact hole. .
The method of claim 1,
And the second opening exposes an upper surface of the second passivation layer directly on the touch wiring.
The method of claim 1,
And a width of the second opening is wider than a width of the touch wiring.
KR1020120157722A 2012-12-29 2012-12-29 Touch sensor in-cell type liquid crystal display device and method of fabricating the same KR102047727B1 (en)

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KR101655410B1 (en) 2014-08-26 2016-09-07 엘지디스플레이 주식회사 In-cell Touch type liquid crystal display device
KR102243954B1 (en) * 2014-12-26 2021-04-23 엘지디스플레이 주식회사 In-Cell Touch Type Display Device and Method for Manufacturing the same
CN110083262B (en) * 2015-01-30 2022-07-26 乐金显示有限公司 Touch display device
KR102246696B1 (en) * 2015-01-30 2021-04-30 엘지디스플레이 주식회사 In-Cell Touch Type Display Device and Method for Manufacturing the same
TWI587199B (en) * 2015-04-01 2017-06-11 友達光電股份有限公司 Display device
CN104915054B (en) * 2015-05-14 2019-10-15 京东方科技集团股份有限公司 Array substrate and preparation method thereof and display device
US10139663B2 (en) * 2015-05-29 2018-11-27 Semiconductor Energy Laboratory Co., Ltd. Input/output device and electronic device
KR102490623B1 (en) * 2015-06-26 2023-01-25 엘지디스플레이 주식회사 Organic Light Emitting Display Device and Menufacturing Method the same
KR102384252B1 (en) * 2015-08-31 2022-04-08 삼성디스플레이 주식회사 Array substrate for touch sensor in-cell type display device and manufacturing method of the same
CN105182633A (en) 2015-09-07 2015-12-23 武汉华星光电技术有限公司 Array substrate and touch display device
CN107765489A (en) * 2017-11-16 2018-03-06 南京中电熊猫平板显示科技有限公司 A kind of touch-control display panel
CN108874232B (en) * 2018-07-26 2021-03-02 京东方科技集团股份有限公司 Array substrate and display panel
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CN113012620B (en) * 2021-03-26 2022-05-17 合肥维信诺科技有限公司 Display panel

Family Cites Families (2)

* Cited by examiner, † Cited by third party
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KR20110135131A (en) * 2010-06-10 2011-12-16 엘지디스플레이 주식회사 Liquid crystal display device having touch sensing function
KR101520423B1 (en) * 2011-04-21 2015-05-14 엘지디스플레이 주식회사 Touch sensor in-cell type liquid crystal display device and method of fabricating the same

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