JPH07105781A - Transparent touch panel structure - Google Patents

Abstract

PURPOSE:To prolong the life of a transparent touch panel and provide good visible property of a display part by carring out the whole surface sticking of the transparent touch panel which is to be stuck to a display panel. CONSTITUTION:An input apparatus 1 is provided with a display part 3 and the surface 2 of the display part 3 can be divided into a center part 2a and a frame side part 2b. The display part 3 is composed of a liquid crystal display and covered with a surface supporting body 8 and the whole surface of a transparent touch panel 4 is stuck to the surface supporting body 8 with a substrate- free acrylic adhesive 7. Since the whole surface sticking of the transparent touch panel 4 is done using the acrylic adhesive with good transparent property, no space is formed between the transparent plates or transparent films and thus the display part of an input apparatus can provide good visibility.

Description

Detailed Description of the Invention

[0001]

[Field of Industrial Application] A transparent touch panel (hereinafter referred to as TTP) used in combination with a display device such as a liquid crystal display or a plasma display. TTP is a glass plate, a polycarbonate plate or a TTP for shape support. It is used as various human interface devices (eg program controller control panel, etc.) by combining with color film, polarizing material, etc. in combination with liquid crystal display, plasma display, etc. It

[0002]

2. Description of the Related Art T used in combination with a display device or the like
The TP4 is used in combination with the surface 2 of the display unit 3 of the input device 1 with a display device, as shown in FIGS. 1 and 2, for example. The frame side portion 2b of the front surface 2 is an invisible portion, and the central portion 2a
Is the visible part. In the display unit 3 corresponding to the central portion 2a,
For example, a display such as a switch is provided, and an operator can input necessary data by pressing the TTP at that position in accordance with the display of the switch or the like.

The TTP 4 is a set of two transparent transparent insulative substrates 5 each having a transparent conductive thin film provided on the opposite surface.
a and 5b are formed by stacking via a spacer 6, and conventionally, as shown in FIG. 3, the adhesive ink 9 is printed and applied only on the frame side portion 2b which is the invisible portion, and the surface of the display portion 3 is shown. It was attached to the support 8. This is to make the display of the display unit 3 easy to see, and if the entire surface is adhered to the TTP,
There was a problem with transparency. That is, the central part 2 which is the visible part
No adhesive material (ink or the like) was used for a.

[0004]

If the TTP is not entirely adhered to the transparent plate or the transparent film such as the surface support 8 of the display device, there is a gap between the TTP and the transparent plate or the transparent film, and the TTP is not present. When inputting by TTP
Pressing causes TTP to generate unnecessary distortion.
There is a problem that the life of the TP thin film is shortened. In addition, there is also a problem that Newton's rings and the like are likely to occur and impair the transparency.
It was necessary to perform non-glare processing on the surface of.

When an adhesive is applied to the entire surface of TTP and the entire surface is adhered, there is a problem in the transparency of the adhesive and unevenness is likely to occur in the application method, so that the transparency of TTP is often impaired. It was

The object of the present invention is that when TTP is used in combination with a display device or the like, it can be adhered to the entire surface of a transparent plate or a transparent film which is used by adhering it to TTP, and when pressed TTP It is an object of the present invention to provide a structure of TTP which does not cause unnecessary distortion and does not impair the transparency of TTP.

[0007]

SUMMARY OF THE INVENTION The present invention provides a transparent touch panel in which a transparent conductive thin film is provided on the opposite surfaces of a transparent, non-insulating substrate, and a transparent touch panel is laminated with a spacer interposed therebetween. It is characterized in that the entire surface is adhered to a transparent plate or a transparent film to be used by being stuck together.

[0008]

The TTP according to the present invention is an acrylic pressure-sensitive adhesive without a base material, which is not a printing method, and is entirely adhered to a transparent plate or a transparent film using a transfer tape which is a highly transparent double-sided pressure-sensitive adhesive. Therefore, even if pressed, unnecessary distortion does not occur. Further, since there is no gap between the TTP and the transparent plate or the transparent film, the Newton ring is not generated. Furthermore, since it is an acrylic adhesive, TTP
There is no loss of transparency.

[0009]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment according to the present invention will be described below with reference to the drawings. FIG. 1 is an overall perspective view of an input device 1 having a display section 3 using a TTP 4 according to the present invention, and FIG. 2 is a sectional view of the same. The input device 1 includes the display unit 3 as described above, and the surface 2 of the display unit 3 is divided into the central portion 2a and the frame side portion 2b. The display unit 3 is composed of a liquid crystal display, is covered by a surface support 8, and the TTP 4 is entirely attached to the surface support 8 with an acrylic adhesive 7 having no base material.

The TTP 4 is a flexible, insulative substrate 5 made of a transparent polyethylene terephthalate film.
An ITO (indium tin) thin film is formed on one surface of a and 5b by sputtering, and one of the insulative substrate 5b
The dot spacer 6 having a small diameter (several .mu.m to 50 .mu.m) is printed on the ITO thin film, and is laminated so as to face the ITO thin film surface of the other absolutely insulative substrate 5a. After stacking, the parts corresponding to the frame side part 2b are thermocompression bonded.

The surface support 8 is made of a highly transparent glass plate, and the TTP 4 is adhered to one surface of the surface support 8 and then incorporated into the display unit 3 of the input device 1. The material of the support 8 is
The resin plate is not limited to the glass plate, and may be a resin plate such as polycarbonate having good transparency.

The base-free acrylic pressure-sensitive adhesive 7 is a highly transparent double-sided pressure-sensitive adhesive whose both surfaces are protected by release films 9a and 9b as shown in FIG. 4, and is used as a transfer tape. It has high transparency because no substrate is used. Further, since it is an acrylic resin, it has excellent adhesiveness and high peel strength. For example, Sumitomo 3M Limited
"Scotch" high-transparent pressure-sensitive adhesive transfer tape # 9483, etc., is desirable.

5 to 8 show the procedure for laminating the acrylic pressure-sensitive adhesive 7 having no base material whose both surfaces are protected by the release films 9a and 9b. FIG. 5 shows a pair of nip rolls 10 and 1.
The procedure of sticking the pressure sensitive adhesive 7 to the surface support 8 while peeling off the one release film 9b of the acrylic pressure sensitive adhesive 7 using 0 is shown. That is, with one end of the peeling film 9b peeled off, the acrylic adhesive 7 is superposed on the surface support 8 and is bitten into the nip rolls 10 and 10, and the peeling film 9b is peeled according to the rotation of the nip rolls 10 and 10. By passing the nip rolls 10 and 10, the acrylic adhesive 7 is attached to the surface support 8.

In FIG. 6, the surface support 8 is attached to a suction chuck 11.
The procedure of holding the sheet at the above position and pressing it with the pressing roll 12 to bond it. Also at this time, with one end of the peeling film 9b peeled off, the acrylic pressure sensitive adhesive 7 is superposed on the surface support 8 and is bitten into the pressing roll 12, and the peeling film 9b is peeled according to the rotation of the pressing roll 12. The acrylic adhesive 7 is attached to the surface support 8 by pressure contact.

FIG. 7 shows a procedure for attaching the TTP 4 to the surface support 8 by the nip rolls 10 and 10 with the acrylic adhesive 7 interposed therebetween. Peel off one end of the other release film 9a of the acrylic pressure-sensitive adhesive 7 attached to the surface support 8 and let it bite into the nip rolls 10 and 10 together with the TTP4, and release the release film 9a according to the rotation of the nip rolls 10 and 10. While passing through the nip rolls 10 and 10, the TTP 4 is attached to the surface support 8 via the acrylic adhesive 7. Release film 9
Since a is peeled off and the pieces are attached at the same time, there is no concern that paper dust, dust or the like will be attached during the attachment.

FIG. 8 shows a procedure for attaching the TTP 4 to the surface support 8 using the suction chuck 11 and the pressure roll 12. Also at this time, the TTP 4 is overlapped with the release film 9a of the acrylic pressure-sensitive adhesive 7 attached to the surface support 8 in a state where the release film 9a is peeled off, and is bitten into the pressing roll 12, and the release film is rotated according to the rotation of the pressing roll 12. By pressing 9a while peeling it off, TTP4 is attached to the surface support 8.

In any of the procedures, the peeling film is peeled off and then attached at the same time. Therefore, it is possible to attach beautifully without dust or paper dust adhering.

In the present embodiment, the TTP bonded to the surface support made of a glass plate is shown, but the present invention is not limited to this, and a film stuck on the surface of the TTP for protection,
Alternatively, a polarizing sheet or the like attached to the surface can be applied, and a transparent plate or a transparent film which is used by being attached to TTP may be used.

[0019]

EFFECTS OF THE INVENTION Since an acrylic adhesive having good transparency is used to adhere TTP over the entire surface, there is no gap between TTP and a transparent plate or transparent film, and Newton's rings do not occur. Since the transparency of the input device is not impaired, the display section of the input device can be visually recognized beautifully. In addition, since the entire surface is adhered even if the size of the TTP is increased, there is an effect that the TTP does not undulate, unnecessary distortion does not occur at the time of pressing, and the life of the TTP is extended.

[Brief description of drawings]

FIG. 1 is a perspective view of an input device with a display unit using a TTP according to the present invention.

FIG. 2 is a sectional view of an input device with a display unit 1 using a TTP4 according to the present invention.

FIG. 3 is a conventional input device 1 with a display unit using TTP4.
FIG.

FIG. 4 is a cross-sectional view of an acrylic pressure-sensitive adhesive without a base material.

FIG. 5 is an explanatory view showing a procedure of attaching an acrylic pressure-sensitive adhesive to a surface support by a nip roll.

FIG. 6 is an explanatory diagram showing a procedure of attaching an acrylic pressure-sensitive adhesive to a surface support by a suction chuck and a pressure roll.

FIG. 7 is an explanatory diagram showing a procedure of attaching TTP to a surface support by a nip roll via an acrylic pressure-sensitive adhesive.

FIG. 8 is an explanatory diagram showing a procedure of attaching TTP to a surface support by a suction chuck and a pressure roll via an acrylic pressure-sensitive adhesive.

[Explanation of symbols]

 1 Input device 3 Display part 4 Transparent touch panel 7 Acrylic adhesive

Claims (1)

[Claims] 1. A transparent touch panel formed by providing a transparent conductive thin film on a surface of a transparent transparent substrate opposite to each other, and forming a transparent touch panel through a spacer. Structure of transparent touch panel characterized by being fully bonded to the transparent plate or film used