JPH07296672A - Touch panel - Google Patents

Abstract

PURPOSE:To provide a touch panel which has high transparency and appearance and excellent position detecting ability by a method wherein a transparent electrode the film thickness of which is controlled is additionally functioned as a reduction reflection coating high refraction layer and a high molecule layer containing conductive particles the film thickness of which is controlled is formed on an outermost surface. CONSTITUTION:At least one base material of transparent electrode base sheets 13 and 14 has refraction of 1.48-1.63. A reduction reflection film consisting of a first layer formed of a transparent electrode having refraction n1 (1.65<=n1<=2.2) and a second layer formed of a high molecule containing conductive particles and having refraction n2 (1.45<=n2<=1.65) is formed on the surface of a transparent base material. A touch panel having optical film thicknesses n1d1 and n2d2 corresponding to the first and second layers which are both lambda0 (lambda0=530nm, hereinafter a similar wavelength indicated) or less and lambda0/20 or more is provided.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a resistance detection type touch panel which is highly transparent and has a good appearance and is excellent in position detection.

[0002]

2. Description of the Related Art Touch panels used for input devices are
Although there are differences in detection methods such as a resistance detection method, an electrostatic capacitance method, and an electromagnetic induction method, a structure composed of a transparent substrate having one or more transparent electrodes is general. Glass plate or PET (polyethylene terephthalate) as transparent substrate
Is usually used, and ITO or tin oxide is used as the transparent electrode. The transparent electrode may be uniform over the entire surface or may be used after being patterned. In order to improve the writing quality and to prevent glare, the pen input surface has come to have a structure in which a plastic film is attached or a fine uneven surface is provided on the surface. The touch panel is used not only as a single input device, but also as a device that can be operated with information on a display screen in combination with a CRT or LCD.

[0003]

However, since the touch panel is composed of a transparent substrate having one or more transparent electrodes, the amount of light of 10% or more is generated due to the surface reflection by the transparent electrode having a high refractive index and the air interface. There was a problem of being lost. In particular, the most common resistance detection method has a low transmittance because it is composed of a pair of transparent substrates whose transparent electrode surfaces face each other through air. Further, the panel is difficult to see due to surface reflection, which is a big problem particularly when used in combination with a display element.

As the antireflection coating, a method of depositing a low refractive index material such as magnesium fluoride or a method of forming a multi-layered material having different refractive indexes (Japanese Patent Laid-Open No. 1-22).
57801), and has been put to practical use in eyeglass lenses and the like. Also, a method of forming a thin film from a fluorine-containing compound having a low refractive index has been proposed (Japanese Patent Laid-Open No. 58-211701). Further, in a method of multi-layer vapor deposition of materials having different refractive indexes, a method of using a transparent conductive film as a high refractive index film has also been proposed (JP-A 61-168899). However, the conventional antireflection coating material has a fatal defect that the outermost surface layer has a high insulating property and the resistance detection method cannot detect the position when it is formed on the electrode.

Therefore, the present invention solves such a problem, and an object of the present invention is to provide a touch panel having a high transparency, a good appearance, and excellent position detectability.

[0006]

In the resistance detection type touch panel composed of a pair of transparent substrates whose transparent electrode surfaces are opposed to each other through air, at least one base material of the transparent electrode substrate is Refractive index 1.48 to 1.63
And the refractive index n made of a transparent electrode material on the surface of the transparent substrate.
₁ (1.65 ≦ n ₁ ≦ 2.2) and a refractive index n ₂ (1.45 ≦ n ₂ ≦) made of a polymer containing conductive particles.
1.65) has an antireflection film formed of the second layer, and has optical film thicknesses n ₁ d ₁ and n ₂ corresponding to the first layer and the second layer.
d ₂ are both lambda ₀ or less, is achieved by at lambda _0/20 or more.

At least one base material of the transparent electrode substrate has a refractive index of 1.48 to 1.63, and the refractive index n is made of a low-refractive material formed in order from the transparent base material surface.
₁ (1.35 ≦ n ₁ ≦ 1.5), a second layer made of a transparent electrode material and having a refractive index n ₂ (1.65 ≦ n ₂ ≦ 2.2), and conductive fine particles. Refractive index n consisting of polymer
₃ (1.45 ≦ n ₃ ≦ 1.65) is formed as the antireflection film, and the optical film thickness n ₁ d corresponding to the first layer, the second layer, and the third layer is formed. ₁ , ₁ , n ₂ d ₂ and n ₃ d ₃ are all λ ₀
Hereinafter, it is accomplished by at lambda _0/20 or more.

[0008]

Function: The theoretical formula for expressing the antireflection effect by forming a multilayer film having different refractive indexes is generally known. However, the structure of the membrane varies depending on the purpose of use, the manufacturing cost, the required additional characteristics, and the like. In the touch panel, the transparency and mechanical strength of the base material are required, and cost reduction is strongly required especially in the resistance detection method. Therefore, the multilayer film formation is limited to at most three layers. Since the transparent electrode also serves as the high refractive index layer, it has a two-layer or three-layer structure including the transparent electrode layer. Further, it is necessary to use a material whose outermost surface layer has conductivity and whose refractive index is not so high.

Transparent substrates that are commonly available have a refractive index of 1.48 to 1.63. Further, tin oxide, ITO, zinc oxide, etc., which are usually used as transparent electrodes, have a high refractive index of 1.65 to 2.2, and the refractive index and conductivity can be controlled by the oxidation state of the film. It is difficult to deviate from this range in. It is necessary to use a polymer layer containing conductive fine particles as the outermost surface layer. The conductive fine particles are a transparent oxide containing tin oxide or ITO having a primary particle diameter of 0.1 μm or less as a main component, and the polymer is a thermosetting polysiloxane or a photocurable acrylic resin. In order to exert the antireflection effect, the refractive index of the film is 1.
It needs to be 65 or less, and can be controlled if it is 1.45 or more from the characteristics of the material forming the film. The conductivity can also be controlled according to the position detection accuracy. Further, if the conductive fine particles are sufficiently dispersed, the film thickness is as thin as λ ₀ or less, so that there is almost no light attenuation due to absorption by the polymer layer containing the conductive fine particles. When a three-layer film structure is used as the antireflection coating, it is meaningless to form it unless the refractive index of the first layer is 1.5 or less, and is 1.35 or more because of the material limitation.

In order to cause the reflected light between the formed multilayer films to interfere with each other to exert the antireflection effect, the optical film thickness nd is λ _0.
Hereinafter, it is desirable that the lambda _0/20 or more. λ ₀ is a visible light central wavelength. on coloring that there lambda ₀ or is likely to occur, antireflection effect is not remarkable, lambda _0/20 or more and without does not occur optical interference. In the two-layer and three-layer antireflection coatings, various film thickness combinations are possible in consideration of achromatism within the above film thickness. However, it is common to take the following film thickness composition derived from the theoretical formula,
Moreover, the antireflection effect is high. In a two-layer film, n ₁ d ₁ = n ₂
d ₂ = λ _0/4 or a structure of _{n 1 d 1 = 2n 2 d} 2 = λ 0/2, the thickness variation of about ± λ _0/10 is acceptable. In the three-layer film, n ₁ d ₁ = n ₂ d ₂ = n ₃ d ₃ = λ ₀ /
4 or a configuration of _{2n 1 d 1 = n 2 d} 2 = 2n 3 d 3 = λ 0/2, also the thickness variation of about ± λ _0/10 is acceptable.

[0011]

【Example】

(Example 1) on a glass substrate having a refractive index of 1.52, the ITO having a refractive index of 1.7 was formed by _{n 1 d 1 = λ 0/} 2 of the film sputtering to a thickness. Next, γ-glycidoxypropyltrimethoxysilane was dissolved in methyl cellosolve, a catalytic amount of hydrochloric acid was added, and the mixture was stirred at room temperature for hydrolysis. Mix there with a dispersion of tin oxide fine particles with an average particle size of 80Å,
Further, magnesium perchlorate was added in a catalytic amount and sufficiently stirred to obtain a coating liquid. This coating solution was applied onto an ITO transparent electrode by a roll coating method, dried at 150 ° C., and had a refractive index of 1.
5 to form a siloxane polymer layer containing tin oxide fine particles of the optical thickness _{n 2 d 2 = λ 0/} 4. The film thickness could be controlled sufficiently in the range of about 50 nm. The surface hardness was as high as 5H or more in pencil hardness, the haze was 0.5% or less, and the transparency was high.
The adhesion of the two-layered film was as good as the cross-cut test 100/100, and the scratch resistance was 1 kg / kg of # 0000 steel wool.
No scratch was observed even after 10 reciprocations with a load of cm ² . No abnormalities were found in the dropping experiments of alcohol, acid, alkali and detergent.

FIG. 1 shows a schematic cross-sectional view of a touch panel using the transparent substrate thus manufactured. In FIG. 1, 11 is a glass substrate, 12 is a PET substrate, 13 and 14 are ITO transparent electrodes, and 15 is a spacer. Further, 16 is a siloxane polymer layer containing tin oxide fine particles formed by the above method. Although it has a two-layer film structure, it was possible to detect the position as a resistance detection type touch panel without any problem. FIG. 2 shows the spectral characteristics of reflectance when a two-layer antireflection coating is applied on a glass substrate. The total line transmittance was improved from 83% to 92%.

A reliability test was conducted on this touch panel. In a high temperature and high humidity test at 50 ° C. and 90% RH for 1000 hours, peeling, cracking, etc. did not occur, and burning did not occur. No abnormality was found in the thermal shock tests at -20 ° C, 25 ° C, and 60 ° C. 200
No abnormality was observed in the 00 Langley sun exposure test. In the present embodiment, a transparent touch panel which is easy to see and has a high yield was achieved, and the cost could be achieved at almost no high cost. Almost no glare due to surface reflection was felt.

(Example 2) A tin oxide film having a refractive index of 1.9 was formed on a glass substrate having a refractive index of 1.5, n ₁ d ₁ = 0.43λ _0.
It was formed by the CVD method so as to have a film thickness of. This glass substrate was dipped in a coating solution similar to that of Example 1, pulled up at an appropriate speed and heated at 150 ° C. for 30 minutes to be cured to have a refractive index of 1.
5 A siloxane polymer layer containing tin oxide fine particles having an optical film thickness n ₂ d ₂ = 0.23λ ₀ was formed. The film thickness is 50 nm
It was possible to control it well within the range. Surface hardness is 5 in pencil hardness
It was as high as H or higher, and the haze was 0.5% or less, and the transparency was high. The adhesion of the two-layered film is good as a cross-cut test of 100/100, and the scratch resistance is # 0000 for steel wool of # 0000.
No scratches were observed even after 10 reciprocations with a load of g / cm ² . No abnormalities were found in the dropping experiments of alcohol, acid, alkali and detergent.

FIG. 3 shows the spectral characteristics of reflectance when a two-layer antireflection coating is applied on a glass substrate. The total line transmittance was improved from 83% to 92%. A touch panel using the transparent substrate thus manufactured was assembled in the same manner as in Example 1. Although it has a two-layer film structure, it was possible to detect the position as a resistance detection type touch panel without any problem. When the LCD having a backlight and the touch panel were combined, the brightness on the display surface was improved from the conventional 55 candelas to 60 candelas. Almost no in-plane luminance distribution was observed, and a bright and attractive panel was achieved.

A reliability test was conducted on this touch panel. In a high temperature and high humidity test at 50 ° C. and 90% RH for 1000 hours, peeling, cracking, etc. did not occur, and burning did not occur. No abnormality was found in the thermal shock tests at -20 ° C, 25 ° C, and 60 ° C. 200
No abnormality was observed in the 00 Langley sun exposure test.

(Example 3) A tin oxide film having a refractive index of 1.9 was formed on a glass substrate having a refractive index of 1.5 by the CVD method so as to have a film thickness of n ₁ d ₁ = 0.1λ ₀ . The glass substrate was dipped in the same coating solution as in Example 1, pulled up at an appropriate speed and heated at 150 ° C. for 30 minutes to be cured, so that the refractive index was 1.5.
A siloxane polymer layer containing tin oxide fine particles having an optical film thickness n ₂ d ₂ = 0.33λ ₀ was formed. The film thickness could be controlled sufficiently in the range of about 50 nm. Surface hardness is pencil hardness 5H
It was high as above, the haze was 0.5% or less, and the transparency was high. The adhesion of the two-layered film is good as a cross-cut test of 100/100, and the scratch resistance is # 0000 for steel wool of # 0000.
No scratches were observed even after 10 reciprocations with a load of g / cm ² . No abnormalities were found in the dropping experiments of alcohol, acid, alkali and detergent.

FIG. 4 shows the spectral characteristics of the reflectance when a two-layer antireflection coating is applied on a glass substrate. The total line transmittance was improved from 82% to 91%. A touch panel using the transparent substrate thus manufactured was assembled in the same manner as in Example 1. Although it has a two-layer film structure, it was possible to detect the position as a resistance detection type touch panel without any problem.

[0019] (Example 4) on a glass substrate having a refractive index of 1.52, the ITO having a refractive index of 1.85 was formed by _{n 1 d 1 = λ 0/} 4 of the film sputtering to a thickness. Similarly, the refractive index is 1.
On the PET film 6, the ITO having a refractive index 1.8 n ₁
It was formed by d ₁ = λ _0/4 of the film sputtering to a thickness.
Next, 3-methacryloxypropyltrimethoxysilane was dissolved in ethyl cellosolve, a catalytic amount of hydrochloric acid was added, and the mixture was stirred at room temperature for hydrolysis. Average particle size of 200
The dispersion liquid of ITO fine particles of Å was mixed, benzophenone was further added in a catalytic amount, and the mixture was sufficiently stirred to obtain a coating liquid.

In a yellow room, this coating solution is ITO
A transparent electrode surface of the attached glass plate and a transparent electrode surface of the PET film with ITO were applied by a roll coating method to form a film. After heating for 3 hours at 50 ° C., ultraviolet rays are 1 Joule irradiation, IT 1.6 index optical thickness _{n 2 d 2 = λ 0/} 4
An acrylic siloxane polymer layer containing O particles was formed.
The film thickness could be controlled sufficiently in the range of about 50 nm. The surface hardness was as high as 5H or more in pencil hardness, the haze was 1% or less, and the transparency was high. The adhesion of the two-layer film is 100
The scratch resistance was as good as / 100, and scratches were not recognized even when the steel wool of # 0000 was reciprocated 10 times with a load of 1 kg / cm ² . No abnormalities were found in the dropping experiments of alcohol, acid, alkali and detergent.
FIG. 5 shows the spectral characteristics of reflectance when a two-layer antireflection coating is applied on a glass substrate.

When a resistance detection type touch panel having the same structure as that of Example 1 was assembled, the resistance detection type touch panel could detect the position without any problem although it had a two-layer film structure. The total line transmittance as a touch panel is improved by 10% or more to 89%,
Further, the haze was 2% or less, and the transparency was high. Reflective LC
When D and a touch panel were combined, the brightness on the display surface was significantly improved, and a panel that was easy to see and looked good was achieved. A reliability test was performed on the LCD touch panel. 1000 at 50 ° C, 90% RH
In the high-temperature high-humidity test for a long time, peeling, cracks, etc. did not occur, and burns did not occur. Also, -20 ℃, 25
No abnormality was found in the thermal shock tests at 60 ° C and 60 ° C. No abnormality was observed in the 20,000 Langley sun exposure test.

(Embodiment 5) A silicon dioxide film having a refractive index of 1.47 was formed on a glass substrate having a refractive index of 1.52 by n ₁ d ₁ = λ ₀ /
It was formed by electron beam evaporation method so that a film thickness of 4, a tin oxide film having a refractive index of 2.0 was formed by _{n 2 d 2 = λ 0/} 4 of the film CVD method so that the thickness. Next, dissolve the acrylic oligomer in an alcohol solvent and use ITO with an average particle size of 400Å.
The dispersion liquid of fine particles was mixed and sufficiently stirred to obtain a coating liquid.

This coating solution was applied onto a tin oxide transparent electrode on a glass substrate by a roll coating method to form a film. 2 at 50 ° C
After heating for a period of time, the electron beam is irradiated with an accelerating voltage of 200 kilovolts to cure, and a refractive index of 1.65 optical film thickness n ₃ d ₃
= And an acrylic polymer layer containing lambda _0/4 of the ITO fine particles. The film thickness could be controlled sufficiently in the range of about 50 nm. The surface hardness was as high as 5H or more in pencil hardness, the haze was 1% or less, and the transparency was high. The adhesion of the two-layered film was as good as a cross-cut test of 100/100, and the scratch resistance was not recognized even when the steel wool of # 0000 was reciprocated 10 times with a load of 1 kg / cm ² . Also alcohol,
No abnormalities were found in the acid, alkali and detergent dropping experiments. FIG. 6 shows the spectral characteristics of reflectance when a three-layer antireflection coating is applied on a glass substrate.

A resistance detection type touch panel having the same structure as in Example 1 was assembled, and an antiglare film was attached to the surface of the PET film. Although it has a three-layered film structure, it can detect the position without any problem as a resistance detection type touch panel. The total line transmittance as a touch panel was improved to 85%. In addition, there was no reflection of outside light, and we were able to achieve a panel that is easy to see and looks good.

[0025] (Example 6) on a glass substrate having a refractive index of 1.5, the silicon dioxide film having a refractive index _{1.46 n 1 d 1 = λ 0} /4
The film is formed by sputtering to a thickness, an ITO having a refractive index of 1.8 was formed by _{n 1 d 1 = λ 0/} 2 of the film sputtering to a thickness continuously. PE with a refractive index of 1.55
S in (polyethersulfone) film was formed by sputtering so that the silicon dioxide film having a refractive index of 1.46 on the thickness of _{n 1 d 1 = λ 0/} 4, the refractive index of 1.8 in succession
Was formed by sputtering so that the ITO film thickness of the _{n 1 d 1 = λ 0/} 2.

Next, an alcohol solution "Transparent antistatic coating liquid P104" (manufactured by Chichibu Cement Co., Ltd.) in which siloxane low molecular weight molecules in which ultrafine particles of antimony-containing tin oxide having an average particle size of 50Å to 100Å are dispersed, Both sides of the substrate and PES film were coated by dipping. Film is formed at a pulling rate of 20 cm / min, and the film is formed at 80 ° C for 3
It was fixed by heating for 0 minutes. Further pulling speed 20 cm
The layers were stacked at a rate of 1 / min, and heated at 120 ° C. for 1 hour to cure. To form a siloxane polymer layer containing tin oxide fine particles having a refractive index of 1.5 optical thickness _{n 3 d 3 = λ 0/} 4. The film thickness could be controlled sufficiently in the range of about 50 nm. The surface hardness was as high as 5H or more in pencil hardness, the haze was 0.5% or less, and the transparency was high. The adhesiveness of the two-layer film is determined by a cross-cut test 10
The scratch resistance was as good as 0/100, and scratches were not observed even when # 0000 steel wool was reciprocated 10 times with a load of 1 kg / cm ² . No abnormalities were found in the dropping experiments of alcohol, acid, alkali and detergent. FIG. 7 shows the spectral characteristics of reflectance when a three-layer antireflection coating is applied on a glass substrate.

A resistance detection type touch panel having the same structure as in Example 1 was assembled. Although it has a three-layered film structure, it can detect the position without any problem as a resistance detection type touch panel. The total line transmittance as a touch panel was improved by 10% or more to 90%, and the haze was 1% or less, and the transparency was high. When a reflective LCD and a touch panel were combined, the brightness on the display surface was significantly improved, and a panel that was easy to see and looked good was achieved. A reliability test was performed on the LCD touch panel. In a high temperature and high humidity test at 50 ° C. and 90% RH for 1000 hours, peeling, cracking, etc. did not occur, and burning did not occur. Also, -20 ° C, 25 ° C, 6
No abnormality was observed in the 0 ° C. thermal shock test. Even in the sunlight exposure test of 20,000 Langley,
No abnormality was found.

Example 7 A magnesium fluoride film having a refractive index of 1.38 was formed on a glass substrate having a refractive index of 1.52 by n ₁ d ₁ =
A tin oxide film having a refractive index of 1.9 was formed by electron beam evaporation to a film thickness of 0.23λ ₀ and n ₂ d ₂ = 0.65λ _0.
It was formed by the CVD method so as to have a film thickness of. Next, the same coating solution as in Example 4 was applied onto the tin oxide transparent electrode on the glass substrate by the roll coating method to form a film. After heating at 50 ° C. for 2 hours, the electron beam is irradiated with an accelerating voltage of 200 kilovolts to cure, and a refractive index of 1.65 optical film thickness n ₃ d ₃ = 0.23
An acrylic polymer layer containing ITO fine particles of λ ₀ was formed.
The film thickness could be controlled sufficiently in the range of about 50 nm. The surface hardness was as high as 5H or more in pencil hardness, the haze was 1% or less, and the transparency was high. The adhesion of the two-layer film is 100
The scratch resistance was as good as / 100, and scratches were not recognized even when the steel wool of # 0000 was reciprocated 10 times with a load of 1 kg / cm ² . No abnormalities were found in the dropping experiments of alcohol, acid, alkali and detergent.
FIG. 8 shows the spectral characteristics of reflectance when a three-layer antireflection coating is applied on a glass substrate.

A resistance detection type touch panel having the same structure as in Example 1 was assembled, and an antiglare film was attached to the surface of the PET film. Although it has a three-layered film structure, it can detect the position without any problem as a resistance detection type touch panel. The total line transmittance as a touch panel was improved to 85%. In addition, there was no reflection of outside light, and we were able to achieve a panel that is easy to see and looks good.

[0030]

As described above, according to the present invention, the transparent electrode having a controlled film thickness also serves as the high refractive layer of the antireflection coating, and the polymer layer containing the conductive fine particles has a controlled film thickness. By being formed on the outermost surface, it was possible to provide a touch panel having high transparency, good appearance, and excellent position detection. It was also practical in terms of manufacturing stability and reliability. Since the touch panel of the present invention is completely the same as the conventional one in terms of component structure, the introduction of the present invention can immediately obtain a great effect.

[Brief description of drawings]

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

FIG. 2 is a spectrum diagram showing a spectral characteristic of reflectance of a transparent electrode surface formed on a transparent substrate in Example 1 of the present invention.

FIG. 3 is a spectrum diagram showing a spectral characteristic of reflectance of a transparent electrode surface formed on a transparent substrate in Example 2 of the present invention.

FIG. 4 is a spectrum diagram showing a spectral characteristic of reflectance of a transparent electrode surface formed on a transparent substrate in Example 3 of the present invention.

FIG. 5 is a spectrum diagram showing a spectral characteristic of reflectance of a transparent electrode surface formed on a transparent substrate in Example 4 of the present invention.

FIG. 6 is a spectrum diagram showing a spectral characteristic of reflectance of a transparent electrode surface formed on a transparent substrate in Example 5 of the present invention.

FIG. 7 is a spectrum diagram showing a spectral characteristic of reflectance of a transparent electrode surface formed on a transparent substrate in Example 6 of the present invention.

FIG. 8 is a spectrum diagram showing a spectral characteristic of reflectance of a transparent electrode surface formed on a transparent substrate in Example 7 of the present invention.

[Explanation of symbols]

11: Glass substrate 12: PET substrate 13: ITO transparent electrode 14: ITO transparent electrode 15: Spacer 16: Polymer layer containing conductive fine particles 21 ... Spectral reflection characteristic curve of surface with two-layer antireflection coating 31 .... Spectral reflection characteristic curve of surface with three-layer antireflection coating

Claims (6)

[Claims] 1. A resistance detection type touch panel comprising a pair of transparent substrates whose transparent electrode surfaces are opposed to each other through air, wherein at least one base material of the transparent electrode substrate has a refractive index of 1.48 to 1. 63, the refractive index n ₁ (1.65 ≦ n ₁ ≦ 2.2) made of a transparent electrode material on the surface of the transparent substrate.
And a second layer having a refractive index of n ₂ (1.45 ≦ n ₂ ≦ 1.65) made of a polymer containing conductive fine particles are formed. And the optical film thicknesses n ₁ d ₁ and n ₂ d ₂ corresponding to the second layer are both λ ₀ (λ ₀ = 520n
m, show similar wavelengths below) below a touch panel, characterized in that at lambda _0/20 or more. 2. In the above touch panel having a two-layer antireflection film including a transparent electrode on the surface of at least one transparent substrate, an optical film thickness n ₁ d corresponding to the first layer and the second layer. ₁ and n ₂ d _{2 is, n 1 d 1 = n 2} d 2 = λ 0/4 (±
The touch panel of claim 1, wherein the range of λ _0/10). 3. An optical film thickness n ₁ d corresponding to the first layer and the second layer in the touch panel having a reflection-reducing film including two layers including a transparent electrode on at least one transparent substrate surface. ₁ and n ₂ d ₂ is _{n 1 d 1 = 2n 2 d} 2 = λ 0/2 (±
The touch panel according to claim 1, characterized in that the λ _0/10). 4. In a resistance detection type touch panel comprising a pair of transparent substrates whose transparent electrode surfaces are opposed to each other via air, at least one base material of the transparent electrode substrate has a refractive index of 1.48 to 1. 63, the refractive index n ₁ (1.35
≦ n ₁ ≦ 1.5) first layer, a transparent electrode material having a refractive index n ₂ (1.65 ≦ n ₂ ≦ 2.2) second layer, and a polymer containing conductive particles. Refractive index n ₃ (1.45 ≦
n ₃ ≦ 1.65), and an antireflection film composed of a third layer is formed, and optical film thicknesses n ₁ d ₁ and n ₂ d ₂ corresponding to the first layer, the second layer and the third layer are formed. , n ₃ d ₃ are both λ ₀ below, λ _0/2
A touch panel which is 0 or more. 5. An optical film corresponding to the first layer, the second layer, and the third layer in the touch panel having a reflection-reducing film including three layers including a transparent electrode on at least one transparent substrate surface. The thicknesses n ₁ d ₁ , n ₂ d ₂ and n ₃ d ₃ are n ₁ d ₁ = n _{2
d 2 = n 3 d 3 =} λ 0/4 The touch panel according to claim 4, wherein the range of (± λ _0/10). 6. An optical film corresponding to the first layer, the second layer and the third layer in the touch panel having a reflection-reducing film including three layers including a transparent electrode on at least one transparent substrate surface. Thickness n ₁ d ₁ , n ₂ d ₂ , n ₃ d ₃ is 2n ₁ d ₁ = n _{2
d 2 = 2n 3 d 3 =} λ 0/2 The touch panel according to claim 4, wherein the range of (± λ _0/10).