JPH06309101A - Transparent touch panel - Google Patents

Abstract

PURPOSE:To obtain a transparent touch panel with high light transmissivity and superior visibility. CONSTITUTION:A hard coating layer 1 is formed on the upper plane of polyethylene terephthalate film as movable electrode side film 2, and a material on which an ITO layer that forms a movable electrode 3 is formed on the lower plane is used. Also, the ITO layer which forms a fixed electrode 6 is formed on the upper plane of the polyethylene terephthalate film, and a material in which an adhesive layer 8 is formed on the lower plane by coating with an acrylic transparent adhesive and releasing film is adhered on the layer is used. Thence, a spacer 4 is formed on the fixed electrode 6, and both film 2, 7 are adhered with each other with a peripheral adhesive layer 5. While, a polycarbonate plate is prepared as a supporting substrate 9, and alignment with the supporting substrate 9 is performed by peeling the releasing film of the fixed electrode side film 7, then, the touch panel can be obtained by adhering the polycarbonate plate on the whole plane.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a transparent touch panel having high light transmittance and excellent visibility.

[0002]

2. Description of the Related Art Conventionally, there has been a transparent touch panel arranged on a display such as an LCD (liquid crystal display) and used as an input device.

In such a transparent touch panel, as shown in FIG. 2, a movable electrode side film 2 on which a transparent movable electrode 3 such as ITO is formed, and a transparent fixed electrode 6 such as ITO are formed. The fixed electrode side film 7 is separated from the fixed electrode side film 7 by a spacer 4 or the like with a slight gap.
There is a structure in which the fixed electrode side film 7 is attached to the supporting substrate 9 made of a transparent plastic plate such as polycarbonate with the peripheral edge thereof by the adhesive 5 so that they are opposed to each other.

[0004]

In the transparent touch panel having such a structure, the light transmittance of the entire transparent touch panel is determined by the light transmittance of both electrode films and the supporting substrate. Since there are layers, the light transmittance of the entire transparent touch panel becomes extremely small due to the difference in refractive index between each member and the air layer.

For example, when this touch panel is set on a reflective LCD, there is a drawback in that the visibility of the LCD is very poor. Therefore, an object of the present invention is to solve the above problems and to provide a transparent touch panel having high light transmittance and excellent visibility.

[0006]

In order to achieve the above object, the transparent touch panel of the present invention has a transparent electrode side film having a movable electrode formed thereon and a fixed electrode side film having a fixed electrode formed thereon. In the transparent touch panel provided on the support substrate, the support substrate and the fixed electrode side film are configured to be entirely adhered via a transparent adhesive layer.

[0007]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described in more detail with reference to the drawings. FIG. 1 is a sectional view showing an embodiment of the transparent touch panel of the present invention. In the figure, 1 is a hard coat layer,
Reference numeral 2 is a movable electrode side film, 3 is a movable electrode, 4 is a spacer, 5 is a peripheral adhesive layer, 6 is a fixed electrode, 7 is a fixed electrode side film, 8 is an adhesive layer, and 9 is a support substrate.

The movable electrode side film 2 has a thickness of 125 μm.
The polyethylene terephthalate film having the hard coat layer 1 formed on the upper surface and the ITO layer serving as the movable electrode 3 formed on the lower surface was used. Further, as the fixed electrode side film 7, an ITO layer which becomes the fixed electrode 6 is formed on the upper surface of a polyethylene terephthalate film having a thickness of 100 μm, and an acrylic transparent adhesive is applied on the lower surface by a roll coater to form an adhesive layer 8. Then, a product having a release film attached thereon was used.

Using these two electrode films 2.7,
A spacer 4 was formed and both electrode films 2 and 7 were bonded together with a peripheral edge adhesive layer 5 according to a usual method for manufacturing a transparent touch panel. On the other hand, a polycarbonate plate having the same size as both electrode films 2 and 7 and having a thickness of 1 mm is prepared as a supporting substrate 9, and the release film of the fixed electrode side film 7 is peeled off to align with the supporting substrate 9 and under vacuum. The transparent touch panel of FIG. 1 was obtained by sticking on the entire surface.

The light transmittance of both electrode films 2.7 used in the transparent touch panel was 85% at 550 nm. Also,
The polycarbonate plate used as the supporting substrate 9 had a light transmittance of 90%. The light transmittance of the entire transparent touch panel is
It was 71%. The light transmittance of the entire conventional transparent touch panel having the configuration shown in FIG. 2 was 65%.

Thus, the light transmittance is improved, and the visibility of the LCD is improved when the transparent touch panel is set on the upper surface of the LCD for use.

The present invention is not limited to the above embodiment. For example, the hard coat layer 1 may not be formed. Further, the support substrate 9 may be a transparent plate such as an acrylic plate or a glass plate.

[0013]

According to the present invention, in a transparent touch panel having a movable electrode side film having a movable electrode formed thereon and a fixed electrode side film having a fixed electrode formed thereon on a transparent support substrate, the support substrate and the fixed electrode side film are provided. And are bonded over the entire surface via a transparent adhesive layer.

Therefore, since the air layer is eliminated as much as possible in the layer structure of the transparent touch panel, the light transmittance of the touch panel is large. In addition, the transparent touch panel has a display such as an LCD or an IC with an image.
When set on a card or the like, the visibility of the lower image through the transparent touch panel is high. Further, the adhesive layer has a cushioning effect against various mechanical stimuli received by the input, and the durability of the movable electrode and the fixed electrode is also improved.

[Brief description of drawings]

FIG. 1 is a sectional view showing an embodiment of a transparent touch panel of the present invention.

FIG. 2 is a cross-sectional view showing a conventional transparent touch panel.

[Explanation of Codes] 1 hard coat layer 2 movable electrode side film 3 movable electrode 4 spacer 5 peripheral adhesive layer 6 fixed electrode 7 fixed electrode side film 8 adhesive layer 9 support substrate

Claims (1)

[Claims] 1. A transparent touch panel having a movable electrode side film having a movable electrode formed thereon and a fixed electrode side film having a fixed electrode formed thereon on a transparent support substrate, wherein the support substrate and the fixed electrode side film are transparent. A transparent touch panel characterized by being adhered over the entire surface via an adhesive layer.