KR102205878B1 - Touch display panel and manufacturing method of the same - Google Patents

Abstract

A touch-integrated display panel according to an embodiment of the present invention is provided. A contact electrode region is defined on the substrate on which the touch electrode and the wiring electrode are formed, a contact auxiliary layer is formed in the contact electrode region, and the contact electrode formed on the contact auxiliary layer and connected through the touch electrode and the wiring electrode is the contact electrode region. The pad electrode of the pad area defined on the substrate opposite to is contacted and connected. The contact auxiliary layer is formed of the same material as the material forming the color filter and the black matrix, and the contact auxiliary layer is formed in a form in which the step difference is reduced in order to connect the wiring electrode to the contact electrode formed on the contact auxiliary layer.

Description

Touch-integrated display panel and manufacturing method thereof {TOUCH DISPLAY PANEL AND MANUFACTURING METHOD OF THE SAME}

The present invention relates to a touch-integrated display panel and a method of manufacturing the same, and more particularly, the invention of a connection auxiliary layer for connecting the wiring electrode of the touch electrode to the pad unit. The wiring electrode of the touch electrode is connected to the pad unit without an additional process. It is to provide a touch-integrated display panel and a manufacturing method thereof.

The touch display panel is divided into a method of attaching a touch film to the display panel and an internal method.

In order to reduce the overall panel thickness, a method of embedding a touch function in a display panel is mainly used.

In the built-in touch-integrated display panel, two substrates are used to implement a touch electrode on the upper substrate and a display-related organic light emitting layer and driving device are mainly used on the lower substrate, and the upper and lower substrates are bonded together to make a touch. Implement an integrated display panel.

The pad portion of such an integrated touch display panel is mainly formed on the lower substrate, and in order to connect the wiring of the touch electrode formed on the upper substrate to the pad portion, an anisotrotic conductive film (ACF) including a conductive ball is connected between the connection electrode of the upper substrate and the lower substrate. A method of forming between pad electrodes and heating and pressing (Tab bonding) is used.

The conductive balls included in the ACF are destroyed during heating and bonding, and as a result, the connection electrode and the pad electrode are electrically connected.

However, the method of using the ACF including the conductive balls has a problem in that contact failure between the connection electrode and the pad electrode may occur due to irregular arrangement of the conductive balls, and the overall thickness of the display panel becomes thick due to the thickness of the ACF. .

[Related technical literature]

1. Liquid crystal display with built-in touch screen (Patent Application No. 10-2010-0080323)

In order to connect the touch electrode of the upper substrate to the pad part of the lower substrate, an ACF film including a conductive ball is used.

ACF films including conductive balls are mainly used with a thickness of 50㎛ or more, and conductive balls are included in ACF in an irregular distribution.

By heating and pressing, the conductive ball is destroyed by pressure and heat and hardens as it cools to connect the connection electrode and the pad electrode.It is difficult to provide a uniform connection due to the irregular distribution of the conductive ball, and it is heated following the bonding process of the upper and lower substrates. There is a problem that must be accompanied by a pressing process.

In addition, due to the thickness of the ACF used, difficulties exist in implementing a slim touch-integrated display panel.

Accordingly, the inventors of the present invention invented a touch-integrated display panel having a structure capable of directly contacting and connecting the connection electrode of the upper substrate and the pad electrode of the lower substrate without using an ACF.

A problem to be solved according to an embodiment of the present invention is to provide a touch-integrated display panel capable of minimizing the bonding thickness of a substrate of a touch-integrated display panel and a manufacturing method thereof.

Another problem to be solved according to an embodiment of the present invention is to provide a touch-integrated display panel and a manufacturing method thereof capable of minimizing a connection failure between a pad unit and a touch connection electrode.

The problems to be solved according to an embodiment of the present invention are not limited to the problems mentioned above, and other problems that are not mentioned will be clearly understood by those skilled in the art from the following description.

In order to solve the above-described problems, in the touch-integrated display panel according to an embodiment of the present invention, a first substrate including at least one driving element and an organic light emitting layer and defining a pad portion is provided. A pad electrode is formed on the pad portion to be connected to the circuit portion. Meanwhile, a second substrate including a plurality of color filter layers and a black matrix facing the first substrate is provided. A plurality of touch electrodes are formed on the second substrate, and a contact electrode region is defined. A contact auxiliary layer is formed in the contact electrode region, and a contact electrode is formed on the contact auxiliary layer. The touch electrode and the contact electrode are connected by wiring electrodes, and when the first substrate and the second substrate are bonded together, the pad electrode of the first substrate and the contact electrode of the second substrate are in contact and connected, so that the electrical connection relationship between the touch electrode and the pad unit Can be implemented without using ACF.

According to another feature of the present invention, the contact auxiliary layer is characterized in that it includes at least one layer formed of the same material as the black matrix.

According to another feature of the present invention, the contact auxiliary layer is formed of at least one layer, and each layer is stacked to shift in one direction.

According to another feature of the present invention, a color filter layer and a touch electrode are sequentially formed from the first substrate.

According to another feature of the present invention, the integrated touch display panel is characterized in that it further includes an ITO layer on the contact electrode.

According to another feature of the present invention, the touch-integrated display panel is characterized in that it further includes an elastic compensation layer between the pad electrode and the first substrate.

According to another feature of the present invention, the elastic compensation layer is characterized in that it is formed of an acrylic resin.

According to another feature of the present invention, the plurality of color filter layers is a color filter layer including an organic material.

In order to solve the above-described problems, a method of manufacturing an integrated touch display panel according to an embodiment of the present invention includes forming a driving device and an organic light emitting device on a first substrate in which a pad area is defined, and a pad electrode in the pad area. Forming a color filter and a black matrix on a second substrate in which at least one contact electrode region is defined, forming a touch electrode on a second substrate, a color filter and a black on the second substrate The forming of the matrix includes forming a contact auxiliary layer in the contact electrode region, forming a plurality of contact electrodes on the contact auxiliary layer, and forming a wiring electrode connecting the touch electrode and the contact electrode. And bonding the first substrate and the second substrate to connect the contact electrode and the pad electrode to each other.

According to another feature of the present invention, the step of forming the contact auxiliary layer includes forming a step relief layer with a halftone mask.

According to another feature of the present invention, the step of forming the contact auxiliary layer is carried out simultaneously with the step of forming the color filter and the black matrix.

According to another feature of the present invention, the step of forming the pad electrode includes forming an elastic compensation layer.

According to an embodiment of the present invention, it is possible to reduce the thickness of the panel by implementing electrical connection between the touch electrode and the pad unit without using ACF.

In addition, the electrical connection between the pad electrode and the contact electrode is implemented in a method of direct contact without using a conductive ball, thereby reducing irregular arrangement of conductive balls and connection failure due to defective conductive balls.

The effects of the present invention are not limited to the above-mentioned effects, and other effects that are not mentioned will be clearly understood by those skilled in the art from the following description.

Since the contents of the invention described in the problems to be solved above, the problem solving means, and effects do not specify essential features of the claims, the scope of the claims is not limited by the matters described in the contents of the invention.

1 is a schematic plan view of an integrated touch display panel according to an embodiment of the present invention.
2 is a schematic cross-sectional view of a touch-integrated display panel according to an embodiment of the present invention.
3A is a cross-sectional view schematically illustrating a cross section of llla-llla' of FIG. 1 according to an embodiment of the present invention.
3B is a cross-sectional view schematically showing a cross section of lllb-lllb' of FIG. 1 according to an embodiment of the present invention.
4A to 4H are schematic cross-sectional views for explaining a schematic manufacturing process of a touch-integrated display panel according to an embodiment of the present invention.

Advantages and features of the present invention, and a method of achieving them will become apparent with reference to the embodiments described below in detail together with the accompanying drawings. However, the present invention is not limited to the embodiments disclosed below, but will be implemented in various forms different from each other, and only these embodiments make the disclosure of the present invention complete, and common knowledge in the technical field to which the present invention pertains. It is provided to completely inform the scope of the invention to those who have it, and the invention is only defined by the scope of the claims.

The shapes, sizes, ratios, angles, numbers, etc. disclosed in the drawings for explaining the embodiments of the present invention are exemplary, and the present invention is not limited to the illustrated matters. The same reference numerals refer to the same components throughout the specification. In addition, in describing the present invention, when it is determined that a detailed description of related known technologies may unnecessarily obscure the subject matter of the present invention, the detailed description thereof will be omitted. When'include','have','consists of', etc. mentioned in the present specification are used, other parts may be added unless'only' is used. In the case of expressing the constituent elements in the singular, it includes the case of including the plural unless specifically stated otherwise.

In interpreting the constituent elements, it is interpreted as including an error range even if there is no explicit description.

In the case of a description of the positional relationship, for example, if the positional relationship of two parts is described as'upper','upper of','lower of','next to','right' Or, unless'direct' is used, one or more other parts may be located between the two parts.

In the case of a description of a temporal relationship, for example,'after','following','after','before', etc. It may also include cases that are not continuous unless' is used.

First, second, etc. are used to describe various elements, but these elements are not limited by these terms. These terms are only used to distinguish one component from another component. Accordingly, the first component mentioned below may be a second component within the technical idea of the present invention.

Each of the features of the various embodiments of the present invention can be partially or entirely combined or combined with each other, technically various interlocking and driving are possible, and each of the embodiments can be implemented independently of each other or can be implemented together in a related relationship. May be.

Hereinafter, various configurations of an integrated touch display device according to an embodiment of the present invention will be described.

Hereinafter, various embodiments of the present invention will be described in detail with reference to the accompanying drawings.

1 is a schematic plan view of an integrated touch display panel according to an embodiment of the present invention.

Referring to FIG. 1, although omitted and briefly illustrated, the first substrate 102 includes a pad area PA and a pad electrode 160, a driving device and an organic light emitting layer, and a second substrate 104 ) Includes a contact electrode 150, a color filter 130, a black matrix 185, a touch electrode 120, and a wiring electrode 155.

The first substrate 102 is connected between the FPC 109 and the pad area PA, and transmits signals from the active area AA and the touch electrode 120 to a circuit unit (not shown). .

The touch electrode 120 is connected to the wiring electrode 155 and the distribution electrode 155 is formed to be connected to the contact electrode 150.

A description of the connection structure between the touch electrode 120 and the pad unit PA for transmitting the electrical signal to the circuit unit will be described later.

2 is a schematic cross-sectional view of a touch-integrated display panel according to an embodiment of the present invention.

Referring to FIG. 2, a first substrate 102 on which a pad part PA is defined is provided.

The driving device layer 110 is formed on the first substrate 102 and the organic light emitting device layer 115 is formed on the driving device layer 110.

A second substrate 104 facing the first substrate 102 is provided, and the first substrate 102 and the second substrate 104 are bonded to each other by the adhesive layer 180.

A color filter 130 is formed on the second substrate 104 (hereinafter, the direction from the second substrate to the first substrate 102 is expressed as “top”).

The color filter 130 may be formed to pass light of a specific color, and may include a red color filter 131, a green color filter 132, and a blue color filter 133. Each color filter constitutes one sub pixel (not shown), and the subpixel without the color filter 130 generally refers to a white subpixel, and the white subpixel considers color reproduction or power consumption. Can be used selectively.

A black matrix 185 is formed on the color filter 130. The black matrix 185 is used to express vivid colors by preventing color mixing between subpixels, and the second substrate 104 is based on the color filter 130. ) Can be formed on the side.

Subsequently, the touch electrode 120 is formed. The touch electrode 120 is made of transparent conductive material such as ITO (Indium Tin Oxide) and IZO (Indium Zinc Oxice) so that it can sense the capacitance caused by the user's touch. do.

Meanwhile, a contact electrode region CEA is defined on the second substrate 104.

The contact electrode region CEA faces the pad region PA defined on the first substrate 102, and a contact auxiliary layer 140 is formed.

The contact auxiliary layer 140 includes at least one layer formed of the same material as the color filter 130 formed on the second substrate 104 or the black matrix 185, and the contact auxiliary layer ( 140) in consideration of the designed gap between the first substrate 102 and the second substrate 104 so that the contact electrode 150 formed on the first substrate 102 and the pad electrode 160 formed on the first substrate 102 can be connected It can be designed in various heights.

The contact auxiliary layer 140 is formed simultaneously with the process of forming the color filter 130 or the black matrix 185.

As an example, the contact auxiliary layer 140 is formed of a first contact auxiliary layer 141, a second contact auxiliary layer 142, a third contact auxiliary layer 143, and a fourth contact auxiliary layer 144.

In more detail, the first contact auxiliary layer 141 is formed of the same material as the red color filter 131, the second contact auxiliary layer 142 is formed of the same material as the green color filter 132, and the third contact The auxiliary layer 143 is formed of the same material as the blue color filter 133, and the fourth contact auxiliary layer 144 is formed of the same material as the black matrix 185.

The contact electrode 150 formed on the contact auxiliary layer 140 is connected to the wiring electrode 155.

The power distribution electrode 155 is connected to the touch electrode 120 and has good step coverage to overcome the step difference from the touch electrode 120 to the contact electrode 150 formed on the contact auxiliary layer 140. Metals such as may be used.

The pad electrode 160 formed on the pad area PA of the first substrate 102 is connected by contacting the contact electrode 150 when the first substrate 102 and the second substrate 104 are bonded together.

Pressure is generated due to bonding of the two substrates. Pressure that can be generated during bonding by forming the elastic compensation layer 170 on the first substrate 102 and forming the pad electrode 160 on the elastic compensation layer 170 Support for

The driving device layer 110 is briefly illustrated in FIG. 2, but may include a thin film transistor (TFT), a flat layer, a pixel electrode, an organic emission layer, a bank, and a common electrode.

As shown in FIG. 2, the elastic compensation layer 170 may be formed of one or more layers, and each layer may be formed of the same material or may be formed of a different material.

For example, the first elastic compensation layer 171 and the second elastic compensation layer 172 may be formed of the same material as the flat layer constituting the driving element layer 110.

Alternatively, the first elastic compensation layer 171 is formed of acrylic resin, which is the same material as the flat layer constituting the driving device layer 110, and a second elastic compensation layer is formed using polyimide (PI). (172) can be formed.

3A is a schematic cross-sectional view illustrating a cross section of llla-llla' of FIG. 1 according to an embodiment of the present invention.

Referring to FIG. 3A, a contact auxiliary layer 340 formed of a plurality of layers is provided on the second substrate 304.

The contact auxiliary layer 340 may be formed of one or more layers as shown in FIG. 3A, and the contact auxiliary layer 340 is formed to further improve the step coverage of the electrode leading to the upper side by reducing the step difference of the contact auxiliary layer 340. ) May be formed by a dry etching method using a half-ton mask.

In order to reduce the number of masks used in the process for forming the contact auxiliary layer 340, a pattern of the contact auxiliary layer 340 is added to the mask used in the process of forming the color filter on the second substrate 304. They may be used together, and in this case, each layer constituting the contact auxiliary layer 340 may be generated to be shifted in one direction.

A detailed description of a method of forming the contact auxiliary layer 340 at the same time by adding a pattern of the contact auxiliary layer 340 to the mask used in the process of forming the color filter will be described later.

Figure 3b is lllb of Figure 1 according to an embodiment of the present invention? It is a cross-sectional view schematically showing the cross section of lllb'.

Referring to FIG. 3B, a contact auxiliary layer 340 formed of a plurality of layers is provided on the second substrate 304.

One side of the contact auxiliary layer 340 may be formed to alleviate a step difference on one side of the contact auxiliary layer 340 in order to prevent a short circuit of the electrode formed when the electrode is continuously formed above the contact auxiliary layer 340.

In order to smoothly form one side of the contact auxiliary layer 340, a dry etching method using a half-ton mask may be used for the contact auxiliary layer 340.

4A to 4H are schematic cross-sectional views for explaining a schematic manufacturing process of a touch-integrated display panel according to an embodiment of the present invention.

Referring to FIG. 4A, a barrier layer 491 is formed on the second substrate 404. The second substrate 404 may include any one of glass, plastic, and metal.

The second substrate 404 may be implemented as a flexible substrate that can be bent by including any one of the above materials.

Plastics that can be used for the second substrate 404 are polyethersulphone (PES), polyacrylate (PAR), polyetherimide (PEI), polyethylene naphthalate (Polyethyelenen Napthalate; PEN), Polyethyelene Terepthalate (PET), Polyphenylene Sulfide (PPS), Polyallylate, Polyimide, Polycarbonate (PC), Cellulose Triacetate (TAC), Cellulose Acetate It may be any one of propionate (Cellulose Acetate Propionate: CAP)

Referring to FIG. 4B, a color filter 430 and a first contact auxiliary layer 441 to a third contact auxiliary layer 443 are formed on the second substrate 404 including the barrier layer 491.

The color filter 430 includes a red color filter 431, a green color filter 432, and a blue color filter 433, and one color filter corresponds to one sub-pixel.

The color filters constituting the color filter 430 may be formed by a dry etching method using a mask after applying a color filter for each color on the second substrate 404.

In this case, when the same mask used is moved to each location to form, a single mask may be used.

At the same time as the red color filter 431 is formed, the first contact auxiliary layer 441 may be formed, and a method such as dry etching using a mask may be used.

Subsequently, the green color filter 432 and the second contact auxiliary layer 442 may be simultaneously formed, and a method such as dry etching using a mask may be used. The mask used at this time is the same mask used when forming the red color filter 431 and the first contact auxiliary layer 441, and the green color filter by shifting the position of the mask by the length of the subpixel 432 and a second contact auxiliary layer 442 are formed.

Since the used mask is shifted by a predetermined length, the first contact auxiliary layer 441 and the second contact auxiliary layer 442 are formed by shifting in one direction as shown in FIG. 3A.

When the first contact auxiliary layer 441 and the second contact auxiliary layer 442 are formed by shifting in one direction, the first contact auxiliary layer 441 and the second contact auxiliary layer 442 are placed at the same position. The step difference of the contact auxiliary layer 440 may be lessened than when formed.

In the same way, the blue color filter 433 and the third contact auxiliary layer 443 are formed.

The first contact auxiliary layer 441, the second contact auxiliary layer 442, and the third contact auxiliary layer may use a halftone mask to further alleviate the step difference.

Referring to FIG. 4C, the black matrix 485 is formed on the color filter 430 and a fourth contact auxiliary layer 444 of the contact auxiliary layer 440 is formed.

Referring to FIG. 4D, a metal electrode 420 for connection with a touch electrode (not shown) is formed on the black matrix 485, and a contact electrode 450 is formed on the contact auxiliary layer 440.

The metal electrode 420 may be formed in a mesh shape on the black matrix 485 and may be formed of the same material as the wiring electrode 155 shown in FIG. 2.

4E and 4F, a driving device layer 410, an organic light emitting device layer 415, a first elastic compensation layer 471, and a second elastic compensation layer 472 are formed on the first substrate 402. .

A first elastic compensation layer 471 is formed of acrylic resin, which is the same material as the flat layer constituting the driving element layer 410, and a second elastic compensation layer 472 is formed using polyimide (PI). ) To form an elastic compensation layer 470.

Referring to FIG. 4G, a pad electrode 460 is formed on the elastic compensation layer 470. Although shown briefly in FIG. 4G, the pad electrode 460 may have a pattern of a plurality of electrodes and is formed to face the contact electrode 450 of FIG. 4D.

Referring to FIG. 4H, the first substrate 402 and the second substrate 404 are bonded together so that the pad electrode 460 and the contact electrode 460 are in contact with each other.

Although the embodiments of the present invention have been described in more detail with reference to the accompanying drawings, the present invention is not necessarily limited to these embodiments, and various modifications can be made without departing from the spirit of the present invention. . Accordingly, the embodiments disclosed in the present invention are not intended to limit the technical idea of the present invention, but to explain the technical idea, and the scope of the technical idea of the present invention is not limited by these embodiments. Therefore, it should be understood that the embodiments described above are illustrative and non-limiting in all respects. The scope of protection of the present invention should be interpreted by the claims, and all technical ideas within the scope equivalent thereto should be interpreted as being included in the scope of the present invention.

102, 402: first substrate
104, 404: second substrate
109: FPC
110, 410: driving element layer
115, 415: light emitting element layer
120, 420: touch electrode
130, 430: color filter
131, 431: red color filter
132, 432: green color filter
133, 433: blue color filter
140, 340, 440: contact auxiliary layer
141, 341, 441: first contact auxiliary layer
142, 342, 442: second contact auxiliary layer
143, 343, 443: third contact auxiliary layer
144, 344, 444: fourth contact auxiliary layer
150, 450: contact electrode
155, 455: wiring electrode
160, 460: pad electrode
170, 470: elastic compensation layer
171, 471: first elastic compensation layer
172, 472: second elastic compensation layer
180, 480: adhesive layer
185, 485: Black Matrix
491: barrier layer
CEA: contact electrode area
PA: Pad area

Claims (12)

A first substrate including at least one driving element and an organic light emitting layer and having a pad region defined;
A pad electrode formed in the pad region;
A second substrate facing the first substrate and having at least one contact electrode region defined;
A plurality of color filters and black matrices formed on the second substrate;
A plurality of touch electrodes formed on the second substrate;
A contact auxiliary layer formed on the contact electrode region and including at least one layer formed of the same material as the color filter;
A plurality of contact electrodes formed on the contact auxiliary layer; And
And a wiring electrode connecting the touch electrode and the contact electrode,
Wherein the contact electrode is connected to and in contact with the pad electrode. The method of claim 1,
The contact auxiliary layer comprises at least one layer formed of the same material as the black matrix. The method of claim 2,
The contact auxiliary layer is formed of at least one layer, and each layer is stacked so as to shift in one direction. The method of claim 1,
The touch-integrated display panel, characterized in that formed in the order of the color filter and the touch electrode from the first substrate. The method of claim 1,
An integrated touch display panel, characterized in that it further comprises an ITO layer on the contact electrode. The method of claim 1,
An integrated touch display panel comprising: an elastic compensation layer between the pad electrode and the first substrate. The method of claim 6,
The elastic compensation layer, characterized in that formed of an acrylic resin, touch integrated display panel. The method of claim 1,
The plurality of color filter layers, characterized in that the color filter layer including an organic material, touch integrated display panel. Forming a driving device and an organic light emitting device on a first substrate in which a pad region is defined;
Forming a pad electrode in the pad area;
Forming a color filter and a black matrix on a second substrate in which at least one contact electrode region is defined;
Forming a touch electrode on the second substrate;
The forming of the color filter and the black matrix on the second substrate includes forming a contact auxiliary layer including at least one layer formed of the same material as the color filter in a contact electrode region,
Forming a plurality of contact electrodes on the contact auxiliary layer; And
Including the step of forming a wiring electrode connecting the touch electrode and the contact electrode,
And connecting the contact electrode and the pad electrode by bonding the first substrate and the second substrate to each other and connecting the contact electrode to the pad electrode. The method of claim 9,
The step of forming the contact auxiliary layer comprises forming a step relief layer with a halftone mask. The method of claim 9,
The step of forming the contact auxiliary layer is characterized in that it proceeds simultaneously with the step of forming the color filter and the black matrix, the touch-integrated display panel manufacturing method. The method of claim 9,
The forming of the pad electrode includes forming an elastic compensation layer.

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