KR20110109244A - Electrostatic capacity type touch screen panel with the excellent visibility and preparing method for the same - Google Patents

Abstract

The present invention relates to a capacitive touch screen having improved visibility and a method of manufacturing the same, and more particularly, to a process of adhering a window layer after coating a liquid optical transparent adhesive on a transparent substrate surface on which a conductive transparent electrode layer is formed. And a process of coating a liquid optical transparent adhesive on the surface of the display layer, and bonding the transparent substrate to which the display layer and the window layer are bonded. The present invention relates to a capacitive touch screen using an optically transparent adhesive and having an air layer omitted.
According to the present invention, it is possible to manufacture a capacitive touch screen with improved visibility and slimming in a higher yield by a simpler process.

Description

Electrostatic capacity type touch screen panel with the excellent visibility and preparing method for the same}

The present invention relates to a capacitive touch screen panel with improved visibility, a slimmer structure, and a window integrated type.

The capacitive touch screen panel has a structure as shown in FIG. 1, and when the panel is touched, a small amount of charge is led to a contact point, and circuits located at each corner of the panel measure information. It is sent to the controller for processing.

A capacitive touch screen panel must be touched by a finger unlike a resistive or surface wave panel that can use a finger or a stylus. Capacitive touchscreens are not affected by external factors and have higher transparency than resistive touchscreens.

However, a process for manufacturing a touch screen panel having a multilayer structure as shown in FIG. 1 is complicated, a long tack time for each process, and a low yield. In addition, the multi-layer touch screen panel uses two ITO thin films, and due to the characteristics of the ITO film, the light transmittance is low, the manufacturer dependence on the sheet resistance is high, and the thickness of the ITO film is small. There is a problem in forming a thin thickness of the overall touch screen panel.

In addition, as shown in FIG. 1, since the display layer and the touch screen panel are bonded by the double-sided adhesive tape (DAT) with the air layer interposed therebetween, the light transmittance is low. It is lost while passing, and visibility is not good.

SUMMARY OF THE INVENTION An object of the present invention is to provide a capacitive touch screen having a structure improved to improve visibility of a conventional capacitive touch screen and to be slimmer, and a manufacturing method thereof.

As an example for achieving the above object, the capacitive window integrated touch screen panel according to the present invention may be formed by the transparent substrate 104 having the conductive transparent electrode layer 103 formed thereon, and the liquid optical transparent adhesive layer 102. A window layer 101 adhered to an upper surface of the transparent substrate 104, and a display layer 105 adhered to the bottom surface of the transparent substrate 104 by a liquid optical transparent adhesive layer 102. It is characterized by.

As another example for achieving the above object, the method for manufacturing a capacitive window integrated touch screen panel according to the present invention may include coating a liquid optical transparent adhesive on a transparent substrate 104 on which a conductive transparent electrode layer 103 is formed. And then bonding the window layer 101, coating a liquid optical transparent adhesive on the surface of the display layer 105, and a transparent substrate to which the display layer 105 and the window layer 101 are adhered. It characterized in that it comprises a step of bonding the 104.

According to the present invention, since the conductive transparent electrode layer is formed by directly depositing a conductive transparent material on a transparent substrate such as tempered glass instead of the ITO film among the touch screen panel components, the transmittance can be greatly improved from the existing 85% to more than 90%. You can get the effect.

In addition, according to the present invention, since each layer is bonded using a liquid optical transparent adhesive instead of the OCA film among the components of the touch screen panel, the laminating process of the OCA film can be omitted, and defect rates such as bubbles are generated during lamination of the film. A reduction effect (reduced from 10% defective to 5%) is obtained.

In addition, according to the present invention, since the OCA film layer is omitted in the touch screen panel, the overall thickness of the touch screen panel can be obtained. [When the existing OCA is used, a thickness of the adhesive layer of at least 25 μm is required, but at least 10 μm in the present invention. It can be attached with the thickness of about 5% reduction effect].

In addition, the touch screen panel of the present invention is improved transmittance and less light loss from the display layer below the touch screen can be obtained an effect that can improve the visibility.

In addition, the touch screen panel of the present invention can omit the ITO film laminating process, OCA film laminating process and the like compared to the prior art can obtain the effect of the process improvement and the yield improvement.

In addition, the touch screen panel of the present invention can obtain various effects due to the low influence of the external environment, in particular, the deformation by heat.

In addition, the touch screen panel of the present invention is a variety of industries such as mobile phones, PDAs (Personal Digital Assistants), navigation, Internet phones, Web pads (Point of Sales) terminals, office monitors, gaming monitors, industrial monitors, etc. Of course, it can be mounted and used in the electronic equipment of the field.

Figure 1 shows a schematic diagram of a cross section of a conventional capacitive touch screen panel.
Figure 2 shows a schematic diagram of a cross section of a conventional capacitive touch screen panel.
Figure 3 shows a schematic diagram of a cross section of the capacitive touch screen panel of the present invention.

Hereinafter, the present invention will be described in detail with reference to the preferred embodiments with reference to each manufacturing step and the accompanying drawings.

1 is a schematic diagram of a cross section of a conventional capacitive touch screen panel, FIG. 2 is a schematic diagram of a cross section of a conventional capacitive touch screen, and FIG. 3 is a schematic diagram of a cross section of a capacitive touch screen of the present invention. It is shown.

First, a liquid optical transparent adhesive is coated on the surface of the transparent substrate 104 on which the conductive transparent electrode layer 103 is formed, and then the window layer 101 is bonded.

The conductive transparent electrode layer 103 may be formed on one or both surfaces of the transparent substrate 104, and the transparent conductive material constituting the conductive conducting oxide (TCO) 103 is not limited thereto. indium tin oxide), fluorine-doped tin oxide (FTO), and indium zinc oxide (IZO).

The conductive transparent electrode layer 103 is formed by depositing a transparent conductive material, and patterned to meet the characteristics required in the capacitive touch screen. Patterning may be performed using wet etching, dry etching, or the like, and it is preferable to mainly use wet etching.

In the conventional case, in order to form a conductive transparent electrode layer in a touch screen panel, a method of laminating an ITO film (ITO thin film) or the like was applied. The ITO film has a low light transmittance, tends to be difficult to control the sheet resistance of ITO, and bubbles are generated during lamination of the film, causing defects.

In the present invention, unlike the above, by forming a transparent transparent electrode layer 103 by depositing a transparent conductive material in the touch screen panel, the above problems can be solved, and the visibility can be improved by improving the light transmittance, and the deposition of the transparent conductive material As a result, the conductive transparent electrode layer 103 may be thinly formed, and thus, the overall slimming may be performed, and the process may be shortened by eliminating the laminating process, and the defect may be reduced due to the bubble generation that may occur during film lamination.

The transparent substrate 104 may be any one selected from tempered glass, normal soda-lime glass, polyethylene terephthalate (PET), polymethylmethacrylate (PMMA), polycarbonate (PC), and the like. In the following, it is preferable to use tempered glass. Tempered glass may be used in the thickness range of 0.5mm or more, preferably, it is preferably used in the 0.7mm to 1.0mm range. If the thickness of the tempered glass is less than the above range, the strength tends to be insufficient. If the thickness of the tempered glass is too thick, the thickness of the tempered glass may be too thick, thus losing the purpose of slimming and reducing the light transmittance. There is a tendency to be undesirable.

After attaching a signal applying cable to the touch screen panel, the window layer 101 is bonded.

In order to adhere the touch screen panel to the window layer 101, a liquid optical clean adhesive (liquid OCA) is used in the present invention. Preferably, the liquid optically clear adhesive uses an ultraviolet curable resin, and when the ultraviolet ray is irradiated after the coating of the adhesive and the adhesion of the window layer 101, the liquid optically clear adhesive is easily cured. The amount of ultraviolet radiation may be appropriately adjusted depending on the type of ultraviolet curable adhesive used.

Conventionally, in order to bond the touch screen panel and the window layer, an optical transparent adhesive coated tape, that is, an OCA film, was used and applied to the panel by a laminating process. Since the laminating process can be omitted, the thickness of the adhesive layer can be made thin, and the window-integrated touch screen panel can be manufactured.

Therefore, the process can be shortened compared to the conventional case of using the OCA film for the interlayer adhesion of the touch screen panel and the window, and the defect rate due to bubble generation that can occur during lamination of the film is reduced, and the adhesive layer is thinned. The thickness of the entire touch screen can be obtained, and the factor of decreasing transmittance due to interlayer refractive index can be eliminated, thereby improving visibility.

In the present invention, after the liquid optical transparent adhesive is coated on the surface of the transparent substrate 104 on which the conductive transparent electrode layer 103 is formed, the window layer 101 is adhered. Coating of the liquid optically clear adhesive may be selected and used a variety of known methods, preferably spray coating, dip coating or the like can be used.

The window layer 101 may be tempered glass, normal soda-lime glass, polyethylene terephthalate, polyethylene acrylate, and polycarbonate (PC, polycarbonate). It may be made of any one selected from the like.

Another process is a process of coating a liquid optically clear adhesive on the surface of the display layer 105.

The display layer 105 may be selected from a liquid crystal display (LCD), a light emitting diode (LED), an active matrix organic light-emitting diode (AMOLED), an electroluminescent (EL), and the like. A liquid optically clear adhesive is coated on the surface of the display layer, and it is preferable to use an ultraviolet curable adhesive. Coating of the adhesive may be suitably used in a variety of known methods, specifically, may be coated by a method of combining the dispensing technique and the lamination technique. This technique can be coated by methods such as lamination in vacuum and air.

Next, a process of adhering the transparent substrate 104 to which the display layer 105 and the window layer 101 are bonded is performed.

In the conventional case, as shown in FIG. 2, the ITO film layer 30 and the display layer 60 were bonded with a double-sided adhesive tape (DAT) 40 with the air layer 50 interposed therebetween. In this case, part of the light coming from the display layer 60 is lost by the air layer, thereby degrading visibility.

In the present invention, the air layer is omitted between the touch screen panel and the display layer 105, and they are bonded using a liquid optically clear adhesive instead of a double-sided adhesive tape. Therefore, since the light from the display layer 105 is not lost by the air layer, the visibility is improved, and since the double-sided adhesive tape is not used, the thickness can be obtained, and the cutting and laminating process for the double-sided adhesive tape can be omitted. The effect can be obtained.

According to the above method, the capacitive window integrated touch screen panel of the present invention can be manufactured, and the touch screen panel of the present invention is a transparent substrate having a conductive transparent electrode layer 103 as shown in FIG. 104, the window layer 101 adhered to the upper surface of the transparent substrate 104 by the liquid optical transparent adhesive layer 102, and the transparent substrate (by the liquid optical transparent adhesive layer 102). And a display layer 105 adhered to the bottom of 104.

The present invention described above is not limited to the above-described embodiment and the accompanying drawings, and various substitutions, modifications, and changes are possible within the scope without departing from the technical spirit of the present invention. It will be evident to those who have knowledge of.

10, 101: window layer 20: optically clear adhesive layer (OCA)
30: ITO film layer 40: double-sided adhesive tape
50: air layer 60, 105: display layer
102: liquid optical transparent adhesive layer (liquid OCA)
103: conductive transparent electrode layer 104: transparent substrate

Claims (9)

The transparent substrate 104 on which the conductive transparent electrode layer 103 is formed,
A window layer 101 adhered to an upper surface of the transparent substrate 104 by a liquid optical transparent adhesive layer 102, and
The display layer 105 bonded to the bottom of the transparent substrate 104 by a liquid optical transparent adhesive layer 102
Capacitive window integrated touch screen panel comprising a.
The method according to claim 1,
The conductive transparent electrode layer 103 is a capacitive window integrated touch screen panel, characterized in that formed on one side or both sides of the transparent substrate (104).
The method according to claim 1,
The conductive transparent electrode layer 104 is a capacitive window integrated touch screen panel, characterized in that made of any one selected from indium tin oxide (ITO), fluorine-doped tin oxide (FTO) and indium zinc oxide (IZO).
The method according to claim 1,
The transparent substrate 104 is a capacitive window integrated touch screen panel, characterized in that any one selected from tempered glass, general soda glass, polyethylene terephthalate (PET), acrylate (PMMA) and polycarbonate (PC). .
The method according to claim 1,
The liquid optical transparent adhesive layer 102 is a capacitive window integrated touch screen panel, characterized in that made of an ultraviolet curable adhesive.
The method according to claim 1,
The window layer 101 is a capacitive window integrated touch screen panel, characterized in that any one selected from tempered glass, general soda glass, polyethylene terephthalate (PET), acrylate (PMMA) and polycarbonate (PC). .
The method according to claim 1,
The display layer 105 may be any one selected from a liquid crystal display (LCD), a light emitting diode (LED), an active matrix organic light-emitting diode (AMOLED), and an electroluminescent (EL). Windows integrated touch screen panel.
Coating a liquid optical transparent adhesive on the surface of the transparent substrate 104 on which the conductive transparent electrode layer 103 is formed, and then adhering the window layer 101,
Coating a liquid optical transparent adhesive on the surface of the display layer 105, and
Bonding the transparent substrate 104 to which the display layer 105 and the window layer 101 are bonded
Method of manufacturing a capacitive window integrated touch screen panel comprising a.
The method of claim 6,
The conductive transparent electrode layer 103 is a method of manufacturing a capacitive window integrated touch screen panel, characterized in that formed by a deposition process.

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