KR20120120719A - Touch window and Fabricating method of the same - Google Patents

Abstract

PURPOSE: A touch window and a manufacturing method thereof are provided to remove bubbles caused by multi-layer concrescence by implementing an air-pass hole on a top ITO(Indium Tin Oxide) film when a top OCA(Optical Clear Adhesive) film and the top ITO film are being laminated in a concrescence process for the films. CONSTITUTION: A first electrode pattern layer(40) is adhered to a side of a transparent window by using a first adhesive insulation layer(50). A second sensing electrode layer(20) is adhered to the first electrode pattern layer by using a second adhesive insulation layer(30). An air-pass hole penetrates the first electrode pattern layer. The air-pass hole is formed on an area except for a pattern electrode area formed on the first electrode pattern layer. A wire unit receives a contact through the other side of the transparent window and is connected with sensing electrodes of the first and the second electrode pattern layers.

Description

Touch window and fabrication method {Touch window and Fabricating method of the same}

The present invention relates to a manufacturing process and structure of a touch window.

The touch panel includes a cathode ray tube (CRT), a liquid crystal display (LCD), a field emission display (FED), a plasma display panel (PDP) and an electroluminescent device. It is installed on the display surface of an image display device such as (ELD; Electro Luminescence Device), and the user presses the touch panel while watching the image display device to input predetermined information into the computer.

1 and 2 show the main components of such a capacitive touch panel. FIG. 1 shows a plan view of an adhesive structure of such a multilayer structure, and FIG. 2 shows a cross-sectional view taken along the X-ray of FIG. Referring to the drawings, the touch panel has a structure of an upper OCA 50 under the transparent window 10, an upper electrode layer 40, a lower OCA 30, and a lower electrode layer 20 below. In general, the lower portion is bonded to the liquid crystal panel (LCD) 60. The touch screen panel (TSP) formed by the bonding of the various layers is a connection pad (P) by cutting the upper OCA 50, the upper electrode layer (ITO) 40, the lower OCA 30 for bonding with the FPCB module. ) Is provided with a bonding area (C) is exposed. However, when the upper OAC 30 layer used for the adhesion between the upper electrode layer 40 and the lower electrode layer 20 in the multilayer structure described above is bubbled on the bonding surface of the upper electrode layer and leads to defects. Becomes frequent.

The present invention has been made in order to solve the above problems, an object of the present invention is the top plate ITO film of the adhesive material layer and the first sensing electrode pattern layer of the top plate OCA film in the process of bonding a plurality of films for the manufacture of the touch window In the case of lamination, by implementing an air pass hole in the upper ITO film to provide a process and structure that can eliminate the bubbles generated by the multi-layer bonding.

As a means for solving the above problems, the present invention is a first sensing electrode pattern layer bonded to one surface of the transparent window through the first adhesive iron layer; And a second sensing electrode pattern layer bonded through the first sensing electrode pattern layer and the second adhesive insulating layer, wherein at least one air pass hole penetrating the first sensing electrode pattern layer is formed. Make it available.

In addition, the air pass hole according to the present invention may be formed at a portion other than the pattern electrode region implemented in the first sensing electrode pattern layer.

In addition, the touch window according to the present invention may further include a wiring part for receiving contact through the other surface opposite to one surface of the transparent window and connected to the sensing electrodes of the first and second sensing electrode pattern layers. . In this case, the wiring part may be formed of a metal material or a transparent conductive material.

In addition, the first and second adhesive insulating layers in the above-described structure may be an OCA film.

In addition, the first and second sensing electrode pattern layers having the above-described structure may be formed of any one of indium-tin oxide (ITO), indium zinc oxide (IZO), or zinc oxide (ZnO) on a base substrate. It is preferable to implement the structure in which the pattern is formed.

The touch window according to the present invention having the above-described structure bonds the first adhesive insulating layer film and the first sensing electrode pattern layer in which the electrode pattern is implemented, forms an air pass hole through the first sensing electrode pattern layer, and adsorbs After fixing on the stage, it may be manufactured by the manufacturing process of the touch window including the step of bonding the second adhesive insulating layer and the second sensing electrode pattern layer on the first sensing electrode pattern layer.

According to the present invention, when laminating the top plate OCA film and the top plate ITO film in the process of bonding a plurality of films for the manufacture of the touch window, by implementing an air pass hole on the top plate ITO film can remove the bubbles generated by the multi-layer bonding It works.

1 and 2 are a plan view and a main sectional view showing the structure of the touch window.
3 and 4 are comparative process diagrams for illustrating an embodiment according to the present invention.

Hereinafter, with reference to the accompanying drawings will be described in detail the configuration and operation according to the present invention. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS In the following description with reference to the accompanying drawings, the same reference numerals denote the same elements regardless of the reference numerals, and redundant description thereof will be omitted. Terms such as first and second may be used to describe various components, but the components should not be limited by the terms. The terms are used only for the purpose of distinguishing one component from another.

An object of the present invention is to provide a touch window having a structure for removing bubbles generated between a plurality of layers constituting the touch screen panel (TSP).

With reference to Figures 3 and 4 will be described the principle of bubble generation in the manufacture of the touch window and the manufacturing process and configuration of the present invention for solving it.

3 is a flowchart illustrating a general manufacturing process of such a touch window.

(a) First, a process of laminating a film constituting the first adhesive iron layer 50 and the first sensing electrode pattern layer 40 to be bonded to the transparent window and adsorbing the adsorption stage S is performed.

In this case, the first sensing electrode pattern layer 40 is bent into the suction stage by the suction force of the suction stage S. As shown in FIG. That is, the portion of the first adhesive iron layer 50 has a region that is patterned and cut to expose the connection pad to form the FPC bonding portion, as described in FIG. 2, in which case the first detection is performed by the tolerance of the portion. The electrode pattern layer 40 is bent downward.

Subsequently, when the second adhesive insulating layer 40 is stacked on the upper surface of the first sensing electrode pattern layer 50, an air region in which bubbles are formed is inevitably generated.

In the subsequent step (d), the second sensing electrode pattern layer 20 is stacked, and the lower plate adsorption stage S 2 is adsorbed, and as in (d), the bonding is secured through the roller R, The above-mentioned air bubbles are hardly removed and problems leading to defects are generated.

Accordingly, in the present invention through the process as shown in Figure 4 to solve the problem caused by the bubble generation.

That is, the core of the technical gist of the present invention is at least one through-hole in one region of the first sensing electrode pattern layer 50, as shown in (a) and (b), so-called air pass hole (H). ), And then the process proceeds to the step of adsorbing on the adsorption stage (S).

That is, when at least one air pass hole (H) is formed on the base material of the PET material on which the sensing electrode pattern of the first sensing electrode pattern layer 50 is not formed and adsorbed on the adsorption stage, (b), ( c) As shown in the process, the suction force in the upper plate adsorption stage S is reduced, and the film constituting the first sensing electrode pattern layer 50 in tension by the tension of the first sensing electrode pattern layer 50. This will spread out.

Thereafter, as in step (c), the second adhesive insulating layer 40 is stacked on the upper surface of the first sensing electrode pattern layer 50, and the second sensing electrode pattern layer 20 is stacked on the upper surface of the first sensing electrode pattern layer 50. do.

When the touch window having the structure shown in FIGS. 1 and 2 is formed through such a structure, the problem of bubble generation occurring between the first sensing electrode pattern layer 50 and the second adhesive insulating layer 40 is fundamental. It can be solved.

The first sensing electrode pattern layer 40 is an electrode formed on one surface of the transparent window 100, and has excellent light transmittance and electrical conductivity, such as indium tin oxide (ITO), indium zinc oxide (IZO), or ZnO (zinc). oxide) and the like. The sensing electrode is used as a conductive plate for generating a capacitance change according to the contact of the human body or the like, and may be patterned into a predetermined shape for accurate determination of the number and contact position of the contact input on the transparent window. In an embodiment of the present invention, the ITO forming surface of the ITO film material formed with ITO on one surface of polyethylene resin (polyethylene terephtalete, PET) is patterned, and the patterned ITO film itself is defined as a sensing electrode pattern layer, and the sensing electrode The pattern layer may include an upper electrode layer including a first sensing electrode pattern layer 40 and a second sensing electrode pattern layer 20 which is a lower electrode layer.

In addition, when the transparent window is contacted by the contact of the user's body or the conductive object, a predetermined capacitance change occurs using the contact object and the sensing electrodes 20 and 40 as electrodes and the transparent window 110 as a dielectric. The capacitance change is measured by a control unit connected to the sensing electrode through a wiring unit (not shown), and the control unit is implemented as a mechanism for determining whether a contact occurs, the number of contact inputs and the contact position, etc. using the measured capacitance change. .

The transparent window is PET (polyethylene terephthalate), PC (polycarbonate), PES (polyether sulfone), PI (polyimide), PMMA (PolyMethly MethaAcrylate), which can be applied to high-strength materials such as glass and acrylic resin having excellent light transmittance, or flexible displays. It may be formed of a material such as. The transparent window 100 serves to maintain the appearance of the input unit of the TSP, and at least a part of the area is exposed to the outside to receive contact of a user's body or a conductive object such as a stylus pen. At this time, it is possible to selectively add a protective layer (not shown) in order to prevent damage or destruction of the transparent window due to the contact.

The display device to which the touch screen panel (TSP) is attached may be not only a liquid crystal display, but also an organic light emitting device, a plasma display panel, and the like. . In this case, in order to prevent noise components generated by driving the display device from being transmitted to the touch sensing panel (TSP) to cause a malfunction of the touch sensing panel, a shielding layer may be selectively disposed between the touch sensing panel and the display device. You can also place

The above-described sensing electrode formed on the touch window according to the present invention can be patterned into various shapes as necessary, for example, rectangular, right triangle, diamond, honeycomb, and the like. For example, a single-layer sensing electrode may be formed in a right triangle facing each other on the same plane, or the sensing electrode may be formed long in the vertical direction. In addition, as shown in FIG. 4, the first sensing electrode layer for determining a first axis (eg, X-axis) component of contact on one surface of the transparent window is patterned and adhered to the first sensing electrode layer. After forming the insulating layer, it is also possible to pattern the second sensing electrode layer for determining the second axis (eg, Y axis) component of the contact to place the sensing electrode of the two-layer structure.

In addition, the wiring unit is connected to the sensing electrode, and the wiring unit includes a screen display of the touch sensing panel (TSP) and the electronic wiring unit to which the touch sensing panel is applied to determine the number and location of the touch, and to operate the touch sensing panel. It is connected to the controlling unit. In this case, a flexible printed circuit board (FPCB) is used to cope with various mechanical shapes inside the electronic device. The circuit pattern formed on the printed circuit board may be connected to the connection pad to receive a detection signal, and determine whether or not a contact occurs and a location where the contact occurs using the received detection signal.

In the foregoing detailed description of the present invention, specific examples have been described. However, various modifications are possible within the scope of the present invention. The technical idea of the present invention should not be limited to the embodiments of the present invention but should be determined by the equivalents of the claims and the claims.

10: transparent window
20: second sensing electrode pattern layer
30: second adhesive insulating layer
40: first sensing electrode pattern layer
50: first adhesive insulating layer

Claims (7)

A first sensing electrode pattern layer adhered to one surface of the transparent window via a first adhesive iron layer;
And a second sensing electrode pattern layer bonded through the first sensing electrode pattern layer and the second adhesive insulating layer.
At least one air pass hole penetrating the first sensing electrode pattern layer is formed.
The method according to claim 1,
The air pass hole,
A touch window is formed at a portion other than the pattern electrode region implemented in the first sensing electrode pattern layer.
The method according to claim 2,
Accepts contact through the other surface opposite to one surface of the transparent window,
The touch window further comprises a wiring portion connected to the sensing electrodes of the first and second sensing electrode pattern layers.
The method according to claim 3,
The wiring part is a touch window formed of a metal material or a transparent conductive material.
5. The method according to any one of claims 1 to 4,
The first and second adhesive insulation layers are OCA films.
The method according to claim 5,
The first and second sensing electrode pattern layers may include a touch window on which a electrode pattern is formed of any one material of indium-tin oxide (ITO), indium zinc oxide (IZO), or zinc oxide (ZnO).
Bonding the first adhesive insulating layer film and the first sensing electrode pattern layer implemented with the electrode pattern,
Forming an air pass hole penetrating the first sensing electrode pattern layer,
And fixing the second adhesive insulating layer and the second sensing electrode pattern layer on the first sensing electrode pattern layer after fixing on the adsorption stage.

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