JP2000047820A - Transparent touch panel and display device using the same - Google Patents

Abstract

[PROBLEMS] To provide a transparent touch panel used for an input device of various electronic devices such as an electronic organizer and a portable terminal, which prevents a change in an operation stroke due to a warp or swell and a generation of a Newton ring and a transparent touch panel. An object of the present invention is to provide a display device using the same. SOLUTION: On a lower surface of a lower electrode substrate 2, a linear pressure-sensitive adhesive layer 11 is formed in a linear shape with a predetermined width capable of securely holding a bonding position, whereby a transparent touch panel 12 is bonded to a support 8 or a display element 9. As a result, it is possible to obtain a transparent touch panel and a display device using the same, in which a change in operation stroke due to warpage or undulation and the occurrence of Newton rings are prevented.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to a transparent touch panel used as an input device in various electronic devices such as an electronic organizer and a portable terminal, and a display device using the same.

[0002]

2. Description of the Related Art In recent years, toward the information society, as input devices for various electronic devices such as electronic notebooks and portable terminals, characters arranged on the upper surface of a display device such as a liquid crystal mounted on these devices and displayed by the display device. Transparent touch panels that can be easily input by detecting the position by pressing a finger, a pen, or the like on a symbol, a pattern, or the like are widely used.

[0003] Such a conventional transparent touch panel will be described with reference to FIGS. In addition, in order to make the configuration easy to understand, each drawing is enlarged in the thickness direction.

FIG. 7 is a cross-sectional view of a conventional transparent touch panel and a display device using the same, and FIGS. 8 and 9 are exploded perspective views of the same. In the drawings, reference numeral 1 denotes a light-transmitting insulating substrate such as polyethylene terephthalate. A light-transmissive electrode layer 1B such as indium tin oxide (hereinafter referred to as ITO) is formed on the lower surface of the material 1A.
Is formed on the upper surface of a light-transmissive insulating base material 2A such as polyethylene terephthalate.
And the like, and a plurality of dot spacers 3 made of epoxy, silicone, or the like are printed on the upper surface of the lower electrode substrate 2B. 4 and an adhesive layer 5 are formed by coating.
B and 2B are bonded to face each other at a predetermined interval.

On the lower surface of the lower electrode substrate 2, an adhesive layer 6 applied to the entire surface as shown in FIG. 8 or an adhesive layer 6A applied to the entire four sides as shown in FIG. A transparent substrate 8 such as polycarbonate having a thickness of about 0.7 to 2.0 mm is adhered to the lower surface of the transparent touch panel 7 with an adhesive layer 6 or 6A. The display device 10 or 10A is configured by disposing the element 9, and is mounted on an electronic device.

In the above configuration, the transparent touch panel 7
Through the upper electrode substrate 1, the lower electrode substrate 2, and the support 8, the characters, symbols, patterns, etc. displayed on the display element 9 can be visually recognized, and the transparent touch panel 7 on the display screen of the display element 9 can be seen. When the upper surface of the upper electrode substrate 1 is pressed, the upper electrode substrate 1 bends and the light transmitting electrode layer 1B comes into contact with the light transmitting electrode layer 2B of the lower electrode substrate 2,
The position can be detected and input.

In the above description, the transparent touch panel is used to prevent the display element 9 such as a liquid crystal from being pressed by the pressing operation of the upper surface of the upper electrode substrate 1 and the display from being blurred and the display visibility from being deteriorated. The support 8 is arranged between the display element 9 and the display element 9. However, if the display element 9 has sufficient strength due to thickness, material, etc., the support 8 is omitted and the transparent touch panel 7 is adhered. It is also possible to form a display device by directly attaching to the display element 9 by the layers 6 and 6A.

[0008]

However, in the above-mentioned conventional transparent touch panel 7, the lower surface of the lower electrode substrate 2 is adhered and fixed to the support 8 or the display element 9 over the entire surface or all around the four sides by the adhesive layers 6, 6A. Therefore, when the support 8 or the display element 9 expands or contracts due to a change in temperature or humidity, the entirety of the transparent touch panel 7 attached to the support 8 or the display element 9 is warped or undulated by the adhesive layers 6 and 6A. Due to the local change in the distance between the lower electrode substrate 1 and the lower electrode substrate 2, the operation stroke becomes large at a place where the distance is wide and the input operability is inferior, and the visibility is reduced at a place where the distance is narrow. There has been a problem that an obstructive interference fringe pattern (hereinafter referred to as Newton's ring) is generated, which deteriorates the visibility of the display element and causes a malfunction.

SUMMARY OF THE INVENTION The present invention has been made to solve such a conventional problem, and it is an object of the present invention to provide a transparent touch panel which prevents a change in an operation stroke or the occurrence of a Newton ring due to warpage or undulation, and a display device using the same. Aim.

[0010]

SUMMARY OF THE INVENTION In order to solve the above-mentioned problems, the present invention is to form a linear pressure-sensitive adhesive layer on an end portion or a middle portion of a lower surface of a lower electrode substrate with a predetermined width capable of securely holding a sticking position. Then, a transparent touch panel is attached to a support or a display element with the adhesive layer to constitute a display device.

As a result, it is possible to obtain a transparent touch panel and a display device using the same, which prevent a change in an operation stroke or the occurrence of a Newton ring due to warpage or undulation.

[0012]

BEST MODE FOR CARRYING OUT THE INVENTION The invention according to claim 1 of the present invention comprises an upper electrode substrate in which a light transmitting electrode layer is formed on a lower surface of a light transmitting insulating substrate, and a light transmitting insulating substrate. A lower electrode substrate having a light-transmitting electrode layer formed on the upper surface, an adhesive layer for opposing the light-transmitting electrode layers of the upper and lower electrode substrates and bonding them at a predetermined interval, and an edge of the lower electrode substrate lower surface or In the middle part, a transparent touch panel consisting of an adhesive layer formed in a linear shape with a predetermined width that can securely hold the sticking position, and a support or display element to which the transparent touch panel is stuck by a change in temperature or humidity Even if expansion or contraction occurs in the transparent touch panel, the sticking to the support or display element of the transparent touch panel is performed with the adhesive layer formed in a linear shape with a predetermined width, and the other parts are in a free state. , Transparent touch panel warps and swells Becomes Nikuku, an effect that can be obtained transparent touch panel that prevents occurrence of changes and Newton rings operating stroke.

According to a second aspect of the present invention, in the first aspect of the present invention, the pressure-sensitive adhesive layer is scattered within a predetermined width, and warpage when a transparent touch panel is attached to a support or a display element. This has an effect that a transparent touch panel in which a change in the operation stroke or the generation of Newton rings due to undulations is less likely to occur can be obtained.

According to a third aspect of the present invention, in the first or second aspect of the invention, a light-transmitting insulating layer for keeping the lower electrode substrate horizontal is formed at a predetermined position on the lower surface of the lower electrode substrate. In addition, since the insulating layer can keep the gap between the lower electrode substrate and the support uniform, it has the effect of preventing the generation of Newton rings between the lower electrode substrate and the support or the display element.

According to a fourth aspect of the present invention, there is provided a display device in which a light-transmissive support or a display element is attached to the lower surface of the transparent touch panel according to any one of the first to third aspects with an adhesive layer. This has an effect that a display device in which a change in the operation stroke due to warpage or undulation and the occurrence of Newton rings can be obtained can be obtained.

Hereinafter, an embodiment of the present invention will be described with reference to FIG.
This will be described with reference to FIG. In addition, in order to make the configuration easy to understand, each drawing is enlarged in the thickness direction.

The same components as those described in the section of the related art are denoted by the same reference numerals, and detailed description thereof will be omitted.

(Embodiment 1) FIG. 1 is a cross-sectional view of a transparent touch panel and a display device using the same according to a first embodiment of the present invention, and FIG. 2 is an exploded perspective view of the same. Is an upper electrode substrate in which a light transmitting electrode layer 1B such as ITO is formed on the lower surface of a light transmitting insulating substrate 1A such as polyethylene terephthalate, and 2 is an upper surface of a light transmitting insulating substrate 2A such as polyethylene terephthalate. Is formed on a light-transmissive electrode layer 2B made of ITO or the like, and a plurality of dot spacers 3 made of epoxy, silicone, or the like are printed on the upper surface of the lower electrode substrate. An insulating layer 4 and an adhesive layer 5 are applied and formed.
The light transmitting electrode layers 1B, 2 of the upper and lower electrode substrates 1, 2
B is bonded opposite to each other at a predetermined interval as in the case of the related art, but the lower surface of the lower electrode substrate 2 has a predetermined position on one side of the left end where the bonding position can be securely held. The pressure-sensitive adhesive layer 11 is formed linearly in width, and the transparent touch panel 12 is configured.

A transparent substrate 8 such as polycarbonate having a thickness of about 0.7 to 2.0 mm is adhered to the lower surface of the transparent touch panel 12, and a display element such as a liquid crystal is attached to the lower surface of the support 8. The display device 13 is configured by arranging the display device 9 and is mounted on an electronic device.

In the above configuration, the transparent touch panel 1
2 through the upper electrode substrate 1, the lower electrode substrate 2, and the support body 8,
When the upper electrode substrate 1 of the transparent touch panel 12 on the display screen of the display element 9 is pressed, the upper electrode substrate 1 is configured to be able to visually recognize characters, symbols, patterns, and the like displayed on the display element 9. When the light transmissive electrode layer 1B is bent and comes into contact with the light transmissive electrode layer 2B of the lower electrode substrate 2, the position detection and input are performed in the same manner as in the related art. The adhesive layer 11 having a predetermined width on the lower left end of the lower electrode substrate 2 is attached to the body 8.
Only at the center, at the right end, etc., with the support 8 free.

As described above, according to the present embodiment, the transparent touch panel 12 is attached to the support 8 by the adhesive layer 11 formed on the left end of the lower surface of the lower electrode substrate 2, and the center and the right end of the transparent touch panel 12 are attached to the support 8. In contrast, the transparent touch panel 12 is free from warping or swell even if the support 8 expands or contracts due to a change in temperature or humidity because of a change in operation stroke or a Newton ring. A transparent touch panel in which generation is prevented can be obtained.

When the display device 13 is mounted on the electronic device, the outer cover and the chassis of the electronic device cover the entire periphery of the upper electrode substrate 1 with a slight gap, so that the adhesive layer 11 is formed. A part such as a central part or a right end which is not formed does not rise from the support body 8.

In the above description, the adhesive layer 11 having a predetermined width is formed on the left end of the lower surface of the lower electrode substrate 2 on a line, but may be provided at the center, the right end, or the like of the lower surface of the lower electrode substrate 2. Needless to say, the same effect can be obtained.

(Embodiment 2) FIG. 3 is an exploded perspective view of a transparent touch panel and a display device using the same according to a second embodiment of the present invention.
Electrode substrate 1 having a light transmitting electrode layer 1B formed on the lower surface of the substrate
A lower electrode substrate 2 having a light-transmitting electrode layer 2B and a plurality of dot spacers 3 formed on an upper surface of an insulating base material 2A; Bonding at predetermined intervals via the adhesive layer 5 is the same as in the first embodiment, but the adhesive layer 11
A is scattered and formed within a predetermined width at the left end of the lower surface of the lower electrode substrate 2 to form the transparent touch panel 12A.

A support 8 such as polycarbonate having a thickness of about 0.7 to 2.0 mm is attached to the lower surface of the transparent touch panel 12A, and a display element 9 such as a liquid crystal is arranged on the lower surface of the support 8. Thus, the display device 13A is configured and mounted on the electronic device.

As described above, according to the present embodiment, the adhesive layer 11A is formed on the left end of the lower surface of the lower electrode substrate 2 so as to be scattered within a predetermined width, whereby the transparent touch panel 12A is attached to the support 8. Therefore, even if the support 8 expands or contracts due to a change in temperature or humidity, the transparent touch panel 12
It is possible to obtain a transparent touch panel in which warping and swelling are less likely to occur in A, and a change in the operation stroke and the occurrence of Newton's ring are less likely to occur.

In the above description, the adhesive layer 11A is formed so as to be scattered at the left end of the lower surface of the lower electrode substrate 2, but it is needless to say that the same effect can be obtained by providing the adhesive layer 11A at the center or the right end. .

Further, as shown in FIG. 4, an insulating layer 14 is formed on the right end of the lower surface of the lower electrode substrate 2, and as shown in FIG. 5, an insulating layer 14A is formed all around the four sides of the lower surface of the lower electrode substrate 2. By making the distance between the lower electrode substrate 2 and the support 8 uniform, the occurrence of Newton rings between the lower electrode substrate 2 and the support 8 can also be prevented.

As shown in FIG. 5, the insulating layer 14A
Is formed on the outer periphery of the lower surface of the lower electrode substrate 2, the positional relationship between the insulating layer 14A and the adhesive layer 11A may be upside down.

In the above description, the transparent touch panel is used to prevent the display element 9 such as a liquid crystal from being pressed by the load for pressing the upper surface of the upper electrode substrate 1 and the display from being blurred and the display visibility from being deteriorated. Although the configuration in which the support 8 is disposed between the display element 12 and the display element 9 has been described, if the display element 9 has sufficient strength due to its thickness, material, and the like, as shown in FIG. It is also possible to constitute the display device by omitting the body 8 and directly attaching the transparent touch panel 12 or 12A to the display element 9 by the adhesive layer 11 or 11A.

Further, in the above description, the adhesive layers 11, 1
Although 1A is formed on the lower surface of the lower electrode substrate 2, it is needless to say that the present invention can be implemented even if these are formed on the upper surface of the support 8 or the display element 9.

[0032]

As described above, according to the present invention, it is possible to obtain a transparent touch panel in which a change in operation stroke due to warpage or undulation and the occurrence of Newton rings and a display device using the same can be obtained. can get.

[Brief description of the drawings]

FIG. 1 is a sectional view of a transparent touch panel according to a first embodiment of the present invention.

FIG. 2 is an exploded perspective view of the same.

FIG. 3 is an exploded perspective view of a transparent touch panel according to a second embodiment of the present invention.

FIG. 4 is an exploded perspective view of the same.

FIG. 5 is an exploded perspective view of the same.

FIG. 6 is a sectional view of the same.

FIG. 7 is a cross-sectional view of a conventional transparent touch panel.

FIG. 8 is an exploded perspective view of the same.

FIG. 9 is an exploded perspective view of the same.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Upper electrode substrate 1A Insulating base material 1B Light transmitting electrode layer 2 Lower electrode substrate 2A Insulating base material 2B Light transmitting electrode layer 3 Dot spacer 4 Insulating layer 5 Adhesive layer 8 Support 9 Display element 11, 11A Adhesive layer 12, 12A transparent touch panel 13, 13A display device 14, 14A insulating layer

 ──────────────────────────────────────────────────続 き Continuing on the front page (72) Inventor: Tetsuyuki Fujii 1006 Kazuma Kadoma, Kadoma, Osaka Prefecture F-term (reference) in Matsushita Electric Industrial Co., Ltd.

Claims (4)

[Claims] An upper electrode substrate having a light-transmitting electrode layer formed on a lower surface of a light-transmitting insulating substrate, and a lower electrode substrate having a light-transmitting electrode layer formed on an upper surface of the light-transmitting insulating substrate. An adhesive layer that opposes the light-transmitting electrode layers of the upper and lower electrode substrates and holds them at a predetermined interval, and a predetermined width that can securely hold the adhering position at an end or an intermediate portion of the lower electrode substrate lower surface. Transparent touch panel consisting of an adhesive layer formed linearly with. 2. The transparent touch panel according to claim 1, wherein the adhesive layers are scattered within a predetermined width. 3. A light-transmitting insulating layer for keeping the lower electrode substrate horizontal at a predetermined position on the lower surface of the lower electrode substrate.
Or the transparent touch panel according to 2. 4. A display device in which a light-transmitting support or a display element is attached to a lower surface of the transparent touch panel according to claim 1 by an adhesive layer.