JP2003114766A - Upper transparent electrode plate for touch panel and device including the same - Google Patents

Abstract

(57) [Problem] To provide an upper transparent electrode plate for a touch panel excellent in abrasion resistance and an apparatus including the same. SOLUTION: An upper transparent electrode plate for a touch panel includes a transparent substrate 1, a transparent electrode layer 3 formed on the back surface of the transparent substrate 1, a polarizing plate 2 laminated on the surface of the transparent substrate 1, and a polarizing plate. 2 and a hard coat processing plate 7 laminated on the upper surface. The hard coat processing plate 7 includes a support 71 made of a polyethylene terephthalate film or an acrylic film, and a hard coat layer 72 formed on the upper surface of the support 71. A light diffusion layer 9 having an internal haze of 3 to 20% is provided between the polarizing plate 2 and the hard coat processing plate 7.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an upper transparent electrode plate for a touch panel and a device including the same, and more particularly to a liquid crystal display device, a plasma display device, an EL display device, a CRT display device and the like. The present invention relates to an upper transparent electrode plate for a touch panel used for a touch panel arranged and a device including the same.

[0002]

2. Description of the Related Art A transparent touch panel as an input switch integrated with a display device is used by being arranged on the display surface of the display device. Although there are various types of touch panels currently used, the resistive film type touch panel is most widely used.

A resistive film type touch panel is an upper transparent electrode plate composed of a transparent substrate and a transparent electrode layer formed on the lower surface thereof, and a lower transparent electrode composed of a transparent substrate and a transparent electrode layer formed on the upper surface thereof. The electrode plate is arranged so that the transparent electrode layers face each other across a predetermined space.

In the touch panel constructed as described above, when the transparent substrate of the upper transparent electrode plate is pressed by the input pen or the finger, the transparent substrate is bent and the transparent electrode layer of the upper transparent electrode plate is changed to the lower transparent electrode at the pressing point. Contact the transparent electrode layer of the plate. Then, the coordinates of the contact point are detected by measuring the electric resistance, and the input information is read.

In the touch panel arranged and used on the display surface of such a conventional display device, the polarizing plate is laminated on the transparent substrate of the upper transparent electrode plate to serve also as the upper polarizing plate of the liquid crystal display device. Alternatively, the reflection of the surface of the transparent electrode layer or the upper surface of the liquid crystal cell is prevented by laminating the polarizing plate and the 1/4 retardation plate.

[0006]

However, since the outermost surface of the polarizing plate laminated on the transparent substrate is usually made of a resin such as triacetyl cellulose, there is a problem that the scratch resistance is poor. .

An object of the present invention is to solve the above problems and provide an upper transparent electrode plate for a touch panel having excellent scratch resistance and a device including the same.

[0008]

An upper transparent electrode plate for a touch panel according to the present invention comprises a transparent substrate, a transparent electrode layer formed on the lower surface of the transparent substrate, and a polarizing plate laminated on the upper surface of the transparent substrate. , A hard coat treatment plate laminated on the upper surface of the polarizing plate, the hard coat treatment plate comprises a support material composed of a polyethylene terephthalate film or an acrylic film, and a hard coat layer formed on the upper surface of the support material. A light diffusing layer having an internal haze of 3 to 20% is provided between the transparent substrate and the hard coat treated plate.

Here, in the upper transparent electrode plate for a touch panel according to the present invention, the polarizing plate comprises a polarizer made of a polyvinyl alcohol resin film, and a lower surface of the polarizer,
A protective film made of triacetyl cellulose laminated on the upper surface or both upper and lower surfaces may be included.

In the upper transparent electrode plate for a touch panel according to the present invention, the supporting material is made of polyethylene terephthalate film, and the thickness of the polyethylene terephthalate film is 0.6 times the total thickness of the protective film made of triacetyl cellulose. The above forms can be adopted.

In this case, the thickness of the polyethylene terephthalate film is preferably 1.0 times or more the total thickness of the protective film made of triacetyl cellulose.

Further, in the upper transparent electrode plate for a touch panel according to the present invention, the transparent substrate may be a transparent flexible resin substrate having an optical function as a retardation plate.

When a transparent flexible resin substrate having an optical function as a retardation film is used as the transparent substrate, the transparent substrate is polyether sulfone, polysulfone, polyarylate, cyclic polyolefin, norbornene resin, And a resin selected from polycarbonate.

Further, the transparent substrate made of a transparent flexible resin substrate having an optical function as such a retardation plate is 1
It can be a quarter wave plate.

In each of the above upper transparent electrode plates for a touch panel, the light diffusion layer can be provided on at least one of the interface between the transparent substrate and the polarizing plate and the interface between the polarizing plate and the hard coat treated plate.

The light diffusion layer is preferably an adhesive layer in which particles having a refractive index different from that of the adhesive component are dispersed in the adhesive component.

Here, the difference between the refractive index of the adhesive component and the refractive index of the particles is preferably 0.02 or more.

The average particle size of the above particles is 2 to 7 μm.
Is preferred. Furthermore, the upper transparent electrode plate for a touch panel according to the present invention may include an antireflection film provided on the upper surface of the hard coat layer.

In the upper transparent electrode plate for a touch panel according to the present invention, hard coat layers may be formed on both sides of the support material.

The present invention further comprises a lower transparent electrode plate for a touch panel in addition to any one of the above upper transparent electrode plates for a touch panel, the lower transparent electrode plate for a touch panel being formed on a transparent substrate and its upper surface. The transparent electrode layer of the upper transparent electrode plate and the transparent electrode layer of the lower transparent electrode plate are the touch panels arranged so as to face each other at a predetermined interval.

Furthermore, the present invention is a display device with a touch panel, wherein the touch panel is arranged on the display surface of the display device.

In the present specification, "polarizing plate" means
It includes a linearly polarizing plate, a circularly polarizing plate, and an elliptically polarizing plate. Further, the circularly polarizing plate and the elliptically polarizing plate include those in which a linearly polarizing plate and a retardation plate are laminated.

[0023]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS FIG. 1 shows the structure of a reference example of an upper transparent electrode plate for a touch panel.

Referring to FIG. 1, this upper transparent electrode plate 10
Includes a transparent substrate 1 and a transparent electrode layer 3 formed on the lower surface of the transparent substrate 1.

The transparent substrate 1 can be bent by pressing with an input pen or a finger, and is made of a thin transparent resin plate. Examples of the transparent resin plate include acrylic resin,
Polycarbonate resin, cyclic polyolefin resin,
Those made of various resins such as polyether sulfone, polyarylate and norbornene-based resin can be used.
The transparent substrate 1 is not limited to such a resin plate and may be formed of a very thin transparent glass plate.

When the transparent substrate 1 is made of a resin such as polyether sulfone, polysulfone, polyarylate, cyclic polyolefin, norbornene-based resin, or polycarbonate, it can also serve as a retardation plate by stretching. . Especially, the retardation is λ /
When the number is 4, the transmitted light can be circularly polarized light, and the elliptic polarization plate can be adapted to the specifications of the retardation plate as the color compensation plate of the LCD. Thus, by using the transparent substrate also as the retardation plate, it is possible to reduce the number of constituent layers of the touch panel, reduce the total thickness, reduce the manufacturing cost, and further improve the input sensitivity.

As the transparent electrode layer 3, a thin film of metal oxide such as ITO (oxide of indium / tin) and oxide of tin / antimony or an extremely thin film of metal such as gold, silver, palladium and aluminum is vacuum-deposited. Method, an ion beam vapor deposition method, a sputtering method, an ion plating method or the like, and is obtained by forming it on the lower surface of the transparent substrate 1.

In this upper transparent electrode plate 10, the polarizing plate 2 is integrally laminated with the transparent substrate 1 on the upper surface of the transparent substrate 1, and the hard coat treatment plate 7 is further provided on the upper surface of the polarizing plate 2. It is stacked. The transparent substrate 1 and the polarizing plate 2 are
For example, they can be laminated by bonding using an adhesive such as an acrylic adhesive or a urethane adhesive.

The polarizing plate 2 is constructed by laminating protective films 22 on both sides of a polarizer 21. The polarizer 21 to be used is not particularly limited, and a normal one, for example, a hydrophilic polymer such as a polyvinyl alcohol film, a polyvinyl formal film, a polyvinyl acetal film, a poly (ethylene-vinyl acetate) copolymer saponified film, or the like. Dye-based polarizer in which iodine and / or dichroic dye is adsorbed and oriented on the film, polyene-based polarizer in which polyene is oriented by dehydration treatment of polyvinyl alcohol film or dehydrochlorination treatment of polyvinyl chloride film Can be illustrated, and the thickness is usually 15μ
It is about m to 25 μm.

The protective film 22 attached to the polarizer 21 is not particularly limited, and may be a commonly used one, for example, a triacetyl cellulose film (thickness of about 50 μm to 200 μm) having excellent transparency. . Then, the protective film 22 is attached to both surfaces of the polarizer 21 with an adhesive such as a polyvinyl alcohol-based adhesive.

The polarizing plate 2 is preferably made of a material having a small heat shrinkage such that the shrinkage rate after standing at 80 ° C. for 2 hours is about 0.5% or less. By using such a polarizing plate 2, it is possible to effectively prevent the occurrence of warpage of the upper transparent electrode plate 10 even when used at high temperatures.

In the present specification, "shrinkage after leaving at 80 ° C. for 2 hours" means leaving the sample in an atmosphere of 23 ° C. and 50% RH for 24 hours, and then cutting out a right-angled quadrilateral. The rectangular parallelepiped was left at 80 ° C and 20% RH for 2 hours, then left at 23 ° C and 50% RH for 15 minutes. To be done.

Shrinkage (%) = {(dimension immediately after cutting)
-(Dimension after leaving at 23 ° C and 50% RH for 15 minutes)} ÷
(Dimension immediately after being cut out) × 100 The hard coat treatment plate 7 is composed of a support material 71 and a hard coat layer 72 formed on the upper surface of the support material 71.

As the material for the hard coat layer 72, thermosetting polysiloxane, ultraviolet curable unsaturated polyester, unsaturated acrylic resin, unsaturated polyurethane, polyamide or the like is used. As the material of the support material 71, a polyethylene terephthalate film or an acrylic film is used.

By thus providing the hard coat-treated plate on the upper surface of the polarizing plate 2, the scratch resistance is remarkably improved.

In the upper transparent electrode plate 10, the antireflection film 8 is formed on the upper surface of the hard coat layer 72.
Is provided. Even when the antireflection film 8 is provided in this manner, the effect of improving the scratch resistance according to the present invention as described above is maintained.

Further, in the upper transparent electrode plate 10, the material of the supporting material 71 is a polyethylene terephthalate film, and the thickness of the polyethylene terephthalate film 71 is two sheets which are attached as protective films on both sides of the polarizer 21. When the total thickness of the triacetyl cellulose film 22 is 0.6 times or more, more preferably 1.0 times or more, the warp of the upper transparent electrode plate 10 can be effectively prevented.

FIG. 2 shows the structure of another reference example of the upper transparent electrode plate for a touch panel. Referring to FIG. 2, in the upper transparent electrode plate 11, the support material 71 of the hard coat processing plate 7 also serves as a substitute for the protective film to be bonded on the upper surface of the polarizer 21. In this example, the polarizer 21 is made of a polyvinyl alcohol-based resin film, and the protective film 22 formed on the lower surface of the polarizer 21 is made of triacetyl cellulose.

The other structure is completely the same as that of the upper transparent electrode plate 10 shown in FIG.

FIG. 3 shows the structure of still another reference example of the upper transparent electrode plate for a touch panel. Referring to FIG. 3, in this upper transparent electrode plate 12, the transparent substrate 1 also serves as a substitute for the protective film to be bonded on the lower surface of the polarizer 21. In this example, the transparent substrate 1 is made of triacetyl cellulose, and the polarizer 21 is made of a polyvinyl alcohol-based resin film.
The other structure is completely the same as that of the upper transparent electrode plate 10 shown in FIG.

Also, these upper transparent electrode plates 11 and 12
Also in the above, the material of the supporting material 71 is a polyethylene terephthalate film, and the thickness of the polyethylene terephthalate film 71 is the triacetyl cellulose film 2 bonded to the upper surface or the lower surface of the polarizer 21.
When the thickness of 2 is 0.6 times or more, more preferably 1.0 times or more, the warp of the upper transparent electrode plate 11 or 12 can be effectively prevented.

FIG. 4 shows the structure of still another reference example of the upper transparent electrode plate for a touch panel. Referring to FIG. 4, in the upper transparent electrode plate 13, the support material 71 of the hard coat processing plate 7 also plays its role in place of the protective film to be bonded on the upper surface of the polarizer 21. The transparent substrate 1 also plays the role of the protective film to be bonded on the lower surface of the polarizer 21. In this example, the transparent substrate 1 is made of triacetyl cellulose, and the polarizer 21 is made of a polyvinyl alcohol-based resin film. The other structure is completely the same as that of the upper transparent electrode plate 10 shown in FIG.

FIG. 5 shows the structure of the upper transparent electrode plate for a touch panel according to the present invention. Hereinafter, differences from the upper transparent electrode plate for a touch panel shown in FIG. 1 will be mainly described, and description of the same parts will be omitted.

Referring to FIG. 5, in this upper transparent electrode plate, as the hard coat treated plate 7, hard coat layers 72 are formed on both front and back surfaces of a support material 71.

As described above, by forming the hard coat layers on both sides of the support material, it is possible to prevent the back surface of the support material from being damaged and lowering the yield during the handling work in the chip cutting and bonding steps. can do. Further, by forming a hard coat layer on the back surface of the support material as well, it is possible to improve the adhesiveness when the hard coat-treated plate and other layers are bonded using an adhesive. The hard coat layer formed on the back surface of the support does not affect the optical characteristics because it is attached using an adhesive. Therefore, the surface may have an uneven structure as shown in FIG. 5 or may be flat. However, by making the front surface and the back surface of the hard-coated plate have the same surface structure, it is possible to eliminate handling mistakes between the front and back surfaces in the manufacturing process.

Further, in this upper transparent electrode plate, the surface of the hard coat layer 72 has a surface roughness including an uneven structure within a predetermined range. Specifically, the surface roughness included in the surface roughness structure has an arithmetic average roughness Ra within the range of 0.1 to 0.5 μm, more preferably 0.1 to 0.3 μm, and the average surface roughness is The interval Sm is 20 to 80
μm, and more preferably in the range of 20 to 60 μm. In this case, the surface reflection preventing effect of the touch panel can be remarkably improved, but the visibility of the information displayed on the display device is hardly affected.

That is, in the surface uneven structure, if the arithmetic average roughness Ra is larger than 0.5 μm, the effect of frosted glass is produced and the visibility of the information displayed on the display device tends to be deteriorated. . On the other hand, if the arithmetic average roughness Ra is smaller than 0.1 μm, the effects of preventing light reflection, preventing reflection of scenery, preventing glare, etc. tend to be insufficient.

Further, the average spacing Sm of the surface uneven structure is 80.
If it is larger than μm, an effect such as a microlens is generated due to the unevenness, and the visibility of the information displayed on the display device tends to decrease. On the contrary, if the average interval Sm of the surface irregularities is smaller than 20 μm, the effects of preventing light reflection, preventing reflection of scenery, preventing glare, etc. tend to be insufficient.

That is, in this upper transparent electrode plate, not only the arithmetic mean roughness Ra in the surface uneven structure of the hard coat layer 72 is within a limited range of 0.1 to 0.5 μm, but also the surface unevenness is Average interval Sm is also 20-80
It is preferably in the limited range of μm. When the arithmetic average roughness Ra and the average interval Sm of the surface irregularities within such a specific limited range are combined,
It is possible to remarkably improve the effect of preventing the surface light reflection of the touch panel and the effect of preventing the reflection of scenery without affecting the visibility of the information displayed on the display device.

More preferably, the average spacing S of the surface irregularities is S.
m is preferably equal to or smaller than the display pixel size used. This is to prevent each pixel from being enlarged or reduced when the uneven structure itself has a function as a fine convex lens or a concave lens.

The arithmetic average roughness Ra and the average spacing Sm of the irregularities can be measured according to JIS-B-0601.

The surface uneven structure as described above can be formed by, for example, embossing. It can also be formed by applying a composition containing a fine filler and a curable resin on the upper surface of the hard coat layer 72 and then curing the curable resin. Furthermore, it is also possible to impart a surface uneven structure by etching. Further, in FIG. 5, the surface uneven structure is formed directly on the upper surface of the hard coat layer 72, but a transparent thin film having the surface uneven structure within the range described above is separately formed, and the thin film is flattened. It goes without saying that it may be bonded on the hard coat layer having a surface.

Further, the hard coat layer 72 is desired to have an external haze value of 10% or less due to surface irregularities so as not to reduce the visibility of information displayed on the display device. Here, “external haze value” means haze value = (scattered light transmittance / total light transmittance) × 100 (%)
It is a value represented by.

Further, in this upper transparent electrode plate, a light diffusion layer 9 having an internal haze of 3 to 20% is formed between the polarizing plate 2 and the hard coat treated plate 7.

As shown in FIG. 5, when an uneven structure is formed on the outermost surface of the upper transparent electrode plate, glare may occur on the display screen. In particular, since the touch panel is arranged with a predetermined distance from the display screen, the glare due to the lens effect of the surface uneven structure remarkably occurs.

By increasing the fineness of the surface uneven structure, it is possible to reduce glare to some extent. However, by providing the light diffusing layer 9 in this way, the occurrence of glare can be effectively prevented.

The light diffusion layer 9 is provided between the hard coat treatment plate 7 and the transparent substrate 1, and may be provided between the polarizing plate 2 and the hard coat treatment plate 7 as shown in FIG. 5, for example. It may be provided between the transparent substrate 1 and the polarizing plate 2, or both between the polarizing plate 2 and the hard coat treatment plate 7 and between the transparent substrate 1 and the polarizing plate 2. Good.

The transparent substrate 1 and the polarizing plate 2 or the polarizing plate 2 and the hard coat treated plate 7 are usually laminated via an adhesive layer. Therefore, it is more preferable that the light diffusion layer 9 also serves as such an adhesive layer, since the layer configuration is not increased.

Examples of the adhesive layer which also serves as the light diffusion layer 9 include an adhesive layer in which particles having a refractive index different from that of the adhesive component constituting the adhesive layer are dispersed. As the adhesive component constituting the adhesive layer, a pressure-sensitive adhesive (adhesive) is usually used, for example, an acrylic pressure-sensitive adhesive, a urethane pressure-sensitive adhesive, or the like.

The particles dispersed in the adhesive layer also serving as the light diffusion layer 9 must have a refractive index different from that of the adhesive component. Specifically, the refractive index of the particles is The difference between the refractive index of the adhesive component and the refractive index of the adhesive component is preferably 0.2 or more. This is because if the refractive index is the same, the light diffusion layer 9 does not function. Further, the refractive index of the particles is preferably larger than the refractive index of the adhesive component. The difference between the refractive index of the adhesive component and the refractive index of the particles is at most about 1.5. The average particle size of the particles is usually 2 to 7 μm.
It is a degree. Furthermore, the amount of particles used in the adhesive layer is usually 0.1 to 1 per 100 parts by weight of the adhesive component.
It is about 0 parts by weight. The shape of the particles is usually spherical.

The internal haze of the light diffusion layer 9 is usually 3 to 20.
%. When the light diffusion layer 9 is composed of two or more layers, the total of these internal hazes may be in the range of 3 to 20%.

The thickness of the light diffusion layer 9 has an internal haze of 3 to 2.
It is not particularly limited as long as it is about 0%, but is usually about 10 to 100 μm, and when it also serves as an adhesive layer, the thickness thereof is usually about 10 to 50 μm.

Although the reason why the glare is reduced by providing the light diffusing layer 9 in this way is not clear, the light from each pixel is diffused when passing through the light diffusing layer 9, and as a result, , The degree of expansion and contraction due to the function of the uneven structure itself as a convex lens or concave lens is suppressed,
It is considered that glare is reduced.

Further, in this upper transparent electrode plate, an antifouling layer 18 is further formed on the upper surface of the antireflection film 8. The antifouling layer 18 is made of, for example, a perfluoroalkyl group-containing organic compound, functions as a friction coefficient control layer, and at the same time has an action of keeping good visibility by preventing fingerprints from adhering and improving wiping property. .

Preferably, the antifouling layer 18 is formed to have a dynamic friction coefficient within the range of 0.02 to 0.1. If the coefficient of kinetic friction is greater than 0.1, the pen tip will not slide smoothly and the writing quality will be poor.
If the coefficient of dynamic friction is smaller than 0.02, the pen tip will be slippery too much and the writing quality will be worse. By controlling the dynamic friction coefficient within the range of 0.02 to 0.1, the writing quality can be improved.

Examples of the perfluoroalkyl group-containing organic compound include a perfluoroalkyl group-containing silane compound.

This silane compound is represented by the following general formula [Chemical formula 1] and has a number average molecular weight of 5 × 10 ² -1.
It is × 10 ⁵ .

[0068]

[Chemical 1]

Among them, R in the general formula [Chemical formula 1]_fIs usually
Linear or branched perfluoroalkane having 1 to 16 carbon atoms
A kill group, preferably CF₃Base, C₂F_FiveBase, C₃F
₇It is a base. The lower alkyl group for Y is usually
Those having 1 to 5 carbon atoms are mentioned. R¹Can be hydrolyzed
Examples of such groups include chlorine, bromine and iodine atoms.
Rogen atom, R³O group, R³COO group, (R^Four)₂C = C
(R³) CO group, (R³) ₂C = NO group, R^FiveC = NO group,
(R^Four)₂N group, and R³CONR^FourGroups preferred (here
And R³Is usually a fatty acid having 1 to 10 carbon atoms such as an alkyl group
Group C hydrocarbon group or phenyl group usually has 6 to 2 carbon atoms
0 aromatic hydrocarbon group, R^FourIs a hydrogen atom or alkyl
A lower aliphatic hydrocarbon group having 1 to 5 carbon atoms, such as a group, R
^FiveIs usually a divalent fatty acid having 3 to 6 carbon atoms such as an alkylidene group.
Aliphatic hydrocarbon group).

More preferably, chlorine atom, CH ₃ O
And a C ₂ H ₅ O group. R ² is a hydrogen atom or an inert monovalent organic group, and is preferably a monovalent hydrocarbon group usually having 1 to 4 carbon atoms such as an alkyl group. a, b,
c and d are integers of 0 to 200, preferably 1 to 50
Is. m and n are integers of 0 to 2, and preferably 0. p is an integer of 1 or 2 or more, preferably an integer of 1 to 10, and more preferably an integer of 1 to 5. The number average molecular weight is 5 × 10 ² to 1 ×.
10 ⁵ and preferably 1 × 10 ³ to 1 × 10 ⁴ .

As a preferred structure of the silane compound represented by the above general formula [Chemical Formula 1], R _f is C ₃ F
₇ groups, a is an integer of 1 to 50, b, c and d are 0, e is 1, Z is a fluorine atom,
There is a compound in which n is 0, that is, a compound represented by the following general formula [Formula 2].

[0072]

[Chemical 2]

(In the formula, Y, m, R ¹ and p have the same meanings as described above, and q represents an integer of 1 to 50.) These silane compounds are silanized from commercially available perfluoropolyether. Can be obtained by
For example, it is as disclosed in Japanese Patent Laid-Open No. 1-294709.

The antifouling layer 18 made of the silane compound may be formed on the antireflection film 8 by, for example, spin coating, dip coating, roll coating, or the like.
A method of applying by gravure coating, curtain flow coating, or a method of vapor deposition is used. The coating is preferably performed by diluting with a solvent from the viewpoint of controlling the thickness of the layer formed of the silane compound and from the viewpoint of workability. The solvent usually has 5 carbon atoms such as perfluorohexane, perfluoromethylcyclohexane, perfluoro-1,3-dimethylcyclohexane and the like.
~ 12 perfluoroaliphatic hydrocarbons, polyfluorinated aromatic hydrocarbons such as bis (trifluoromethyl) benzene,
Examples include polyfluorinated aliphatic hydrocarbons. The concentration of the silane compound in the coating solution is 0.05-in the dip coating method.
0.5 wt% is preferable.

The thickness of the antifouling layer 18 made of the silane compound is, in terms of the friction coefficient control effect and the antireflection effect,
0.001 to 0.03 μm is preferable.

FIG. 6 is a sectional view showing a reference example of a display device with a touch panel including the upper transparent electrode plate 10 shown in FIG.

Referring to FIG. 6, display device with a touch panel 50 includes upper transparent electrode plate 10 and lower transparent electrode plate 20.
A touch panel 30 including and is arranged on the display surface of a display device 40 such as a liquid crystal display device.

The lower transparent electrode plate 20 comprises a transparent substrate 4 and a transparent electrode layer 5 formed on the upper surface of the transparent substrate 4.

The transparent substrate 4 is made of a thin transparent glass plate or a transparent resin plate. As the transparent resin plate, one made of the same material as the transparent substrate 1 can be used. Also,
The transparent electrode layer 5 may be formed similarly to the transparent electrode layer 3 of the upper transparent electrode plate 20.

Upper transparent electrode plate 10 and lower transparent electrode plate 20
Are arranged so that the transparent electrode layer 3 and the transparent electrode layer 5 face each other with a predetermined interval by the spacer 6.

[0081]

Reference Example The upper transparent electrode plate for a touch panel according to the present invention is characterized by including a light diffusing layer having an internal haze of 3 to 20% between the transparent substrate and the hard coat treated plate. Since the scratch resistance is greatly affected by the hard coat-treated plate, not by the light diffusion layer, an upper transparent electrode plate for a touch panel having no light diffusion layer is used as a reference example, and this reference example will be described below.

Reference Example 1 An upper transparent electrode plate for a touch panel having the structure shown in FIG. 1 was produced as follows.

As the polarizing plate 2, a polarizer 21 made of a polyvinyl alcohol film (thickness 20 μm) and protective films 22 (thickness 80 μm) made of triacetyl cellulose bonded to the upper and lower surfaces of the polarizer 21 were used.

As the hard coat treated plate 7, a polymethylmethacrylate (acrylic) film (thickness 230 μm) was used.
m) on the upper surface of the support material 71.
2 (thickness 6 μm) was used. Further, an antireflection film was formed on the upper surface of the hard coat layer 72. The antireflection film is composed of a silicon oxide layer (thickness 980Å) / titanium oxide layer (thickness 690) in order from the hard coat layer side.
Å) / silicon oxide layer (thickness 980Å) / titanium oxide layer (thickness 690Å) / silicon oxide layer (thickness 980Å) 5
It has a layered structure.

Transparent substrate 1, transparent electrode layer 3 made of ITO
Had a thickness of 180 μm and a thickness of 200 μm, respectively.

The upper transparent electrode plate for a touch panel thus obtained was linearly reciprocated with a load of 250 g using a polyacetal pen (tip 0.8 mmR),
Then, the presence or absence of scratches on the surface was visually observed.

As a result, the number of round trips is 5000, 200
No scratches were observed on the surface at 00 times,
When the number of reciprocations was 50,000, scratches on the surface were visually observed.

Reference Example 2 As a supporting material 71, a polyethylene terephthalate film (thickness 188 μm) was used instead of the polymethylmethacrylate (acrylic) film.
Using, the same upper transparent electrode plate for a touch panel as in Reference Example 1 was produced.

The upper transparent electrode plate for a touch panel thus obtained was linearly reciprocated with a load of 250 g using a polyacetal pen (tip 0.8 mmR),
Then, the presence or absence of scratches on the surface was visually observed.

As a result, the number of round trips is 5000, 200
The scratches on the surface were not observed even at the times of 00 and 50,000.

Furthermore, a touch panel was produced using the upper transparent electrode plate for a touch panel of Reference Example 2 and the occurrence of warpage of the upper transparent electrode plate was evaluated.

FIG. 7 is a diagram for explaining a method of evaluating the occurrence of warpage of the upper transparent electrode plate.

Referring to FIG. 7 (A), first, the upper transparent electrode plate 10 and the lower transparent electrode plate 20 are arranged with a predetermined distance d by the spacer 6 to manufacture a 12-inch size touch panel. .

Next, this touch panel is put at 30 ° C. and 90%
Hold at RH for 80 hours. Then, the upper transparent electrode plate 10
As shown in FIG. 7B, a warp occurs upward in the central part, and the lower transparent electrode plate 2 near the central part
The distance D from 0 was larger than that at the beginning of production shown in FIG.

Therefore, the occurrence of warpage of the upper transparent electrode plate was evaluated using the amount of change in stroke (Dd) near the center of the touch panel.

As a result, in the case of Reference Example 2, the thickness of the polyethylene terephthalate film 71 was 188 μm, the total thickness of the two triacetyl cellulose films 22 was 160 μm, and the stroke variation was 0. It was 2 mm, and it was found that warpage hardly occurred.

Comparative Example 1 An upper transparent electrode plate for a touch panel similar to that of Reference Example 1 was prepared by using triacetyl cellulose (thickness: 80 μm) instead of polymethylmethacrylate (acrylic film) as the supporting material 71. .

The upper transparent electrode plate for a touch panel thus obtained was linearly reciprocated with a load of 250 g using a pen made of polyacetal (tip 0.8 mmR),
Then, the presence or absence of scratches on the surface was visually observed.

As a result, no scratches were observed on the surface when the number of reciprocations was 5000, but the number of reciprocations was 20.
At 000 times, scratches on the surface could be visually observed.

With respect to the upper transparent electrode plate for a touch panel of Comparative Example 1, a touch panel was prepared and the occurrence of warpage of the upper transparent electrode plate was evaluated.

As a result, in the case of Comparative Example 1, it was found that the polyethylene terephthalate film was not used and the amount of change in stroke was 3.6 mm, which caused a considerably large warp.

Reference Example 3 In Reference Example 2, an upper transparent electrode plate was prepared by setting the thickness of the polyethylene terephthalate film 71 to 125 μm and using two triacetyl cellulose films 22 having a thickness of 80 μm as in Reference Example 2. did.

Regarding the upper transparent electrode plate of Reference Example 3,
A touch panel was produced in the same manner as in Reference Example 2 and the occurrence of warpage of the upper transparent electrode plate was evaluated.

As a result, the stroke change amount is 0.6 m.
m, and it was found that warpage did not occur much.

Reference Example 4 In Reference Example 2, the polyethylene terephthalate film 71 had a thickness of 125 μm, and two triacetyl cellulose films 22 having a thickness of 50 μm were used to produce an upper transparent electrode plate.

Regarding the upper transparent electrode plate of Reference Example 4,
A touch panel was produced in the same manner as in Reference Example 2 and the occurrence of warpage of the upper transparent electrode plate was evaluated.

As a result, the stroke change amount is 0.3 m.
It was found that there was almost no warpage.

Reference Example 5 In Reference Example 2, the polyethylene terephthalate film 71 had a thickness of 38 μm, and two triacetylcellulose films 22 having a thickness of 80 μm were used in the same manner as in Reference Example 2 to produce an upper transparent electrode plate. did.

Regarding the upper transparent electrode plate of Reference Example 5,
A touch panel was produced in the same manner as in Reference Example 2 and the occurrence of warpage of the upper transparent electrode plate was evaluated.

As a result, the stroke change amount is 3.6 m.
It was found that a large warp was generated.

Reference Example 6 In Reference Example 2, the support material 7 was used.
An upper transparent electrode plate was produced in the same manner as in Reference Example 2 except that an acrylic film having a thickness of 125 μm was used as the material of 1 instead of polyethylene terephthalate.

Regarding the upper transparent electrode plate of Reference Example 6,
A touch panel was produced in the same manner as in Reference Example 2 and the occurrence of warpage of the upper transparent electrode plate was evaluated.

As a result, the stroke change amount is 3.6 m.
It was found that a large warp was generated.

The evaluation results of warpage of the upper transparent electrode plates of Reference Examples 2 to 6 and Comparative Example 1 are shown in Table 1 below.
Put together.

[0115]

[Table 1]

[0116]

As described above, according to the present invention,
On the upper surface of the polarizing plate, a hard coat treated plate in which a hard coat layer is formed on a support material made of a polyethylene terephthalate film or an acrylic film is laminated. Therefore, scratch resistance is improved. In particular, the acrylic film is isotropic in terms of engineering, and thus is preferably used as a support material for the hard-coated plate in the present invention.

Further, according to the present invention, in addition to the effects described above, it is possible to effectively prevent the warp of the upper transparent electrode plate due to the expansion of the triacetyl cellulose film due to the heat generation of the display device. You can also achieve the effect.

[Brief description of drawings]

FIG. 1 is a cross-sectional view showing a configuration of a reference example of an upper transparent electrode plate for a touch panel.

FIG. 2 is a cross-sectional view showing the configuration of another reference example of the upper transparent electrode plate for a touch panel.

FIG. 3 is a cross-sectional view showing the configuration of still another reference example of the upper transparent electrode plate for a touch panel.

FIG. 4 is a cross-sectional view showing the configuration of still another reference example of the upper transparent electrode plate for a touch panel.

FIG. 5 is a sectional view showing a structure of an upper transparent electrode plate for a touch panel according to the present invention.

FIG. 6 is a cross-sectional view showing a reference example of a display device with a touch panel.

FIG. 7 is a diagram for explaining a method for evaluating the occurrence of warpage of the upper transparent electrode plate.

[Explanation of symbols]

1,4 transparent substrate, 2 polarizing plate, 3,5 transparent electrode layer,
6 spacers, 7 hard coat treated plate, 8 antireflection film, 9 light diffusion layer, 10, 11, 12, 13 upper transparent electrode plate, 18 antifouling layer, 20 lower transparent electrode plate, 21 polarizer, 22 protective film, 30 touch panel, 40
Display device, 50 Display device with touch panel, 71 Support material, 72 Hard coat layer. In each drawing, the same reference numerals indicate the same or corresponding parts.

─────────────────────────────────────────────────── ─── Continuation of the front page (51) Int.Cl. ⁷ Identification code FI theme code (reference) G02B 5/30 G02F 1/1335 5B087 G02F 1/1333 510 510 GG435 1/1335 1/13363 510 G09F 9/00 313 1/13363 G02B 1/10 A G09F 9/00 313 Z F term (reference) 2H042 AA26 BA02 BA12 BA20 DA17 DA21 2H049 BA02 BA07 BB03 BB33 BB42 BB43 BB51 BB63 BB65 BC22 2H089 HA18 JA08 QA02 FA11X FA02 FA14 FA32 FA08 TA17 TA08 FA08 TA02 TA08 FD06 FD15 GA16 GA17 LA02 LA13 2K009 AA02 AA15 BB11 CC24 DD02 5B087 AA04 AC09 CC12 CC14 CC16 CC18 CC37 5G435 AA06 BB12 FF05 HH03 HH04 HH18 LL08 LL12

Claims (15)

[Claims] 1. An upper transparent electrode plate for a touch panel, comprising a transparent substrate, a transparent electrode layer formed on a lower surface of the transparent substrate, a polarizing plate laminated on an upper surface of the transparent substrate, and the polarizing plate. A hard coat treatment plate laminated on the upper surface of the plate, the hard coat treatment plate, a support material made of a polyethylene terephthalate film or an acrylic film, and a hard coat layer formed on the upper surface of the support material. An upper transparent electrode plate for a touch panel, comprising a light diffusion layer having an internal haze of 3 to 20% between the transparent substrate and the hard coat treated plate. 2. The polarizing plate comprises a polarizer made of a polyvinyl alcohol-based resin film, and a lower surface of the polarizer,
The upper transparent electrode plate for a touch panel according to claim 1, comprising a protective film made of triacetyl cellulose laminated on the upper surface or both upper and lower surfaces. 3. The touch panel according to claim 2, wherein the support material is made of a polyethylene terephthalate film, and the thickness of the polyethylene terephthalate film is 0.6 times or more the total thickness of the protective film made of triacetyl cellulose. Upper transparent electrode plate for. 4. The thickness of the polyethylene terephthalate film is 1.0 times or more the total thickness of the protective film made of triacetyl cellulose.
The upper transparent electrode plate for the touch panel described. 5. The transparent substrate is a transparent flexible resin substrate having an optical function as a retardation plate.
An upper transparent electrode plate for a touch panel according to any one of 1. 6. The upper transparent electrode for a touch panel according to claim 5, wherein the transparent substrate is formed of a resin selected from polyether sulfone, polysulfone, polyarylate, cyclic polyolefin, norbornene-based resin, and polycarbonate. Board. 7. The transparent substrate is a quarter-wave plate,
An upper transparent electrode plate for a touch panel according to claim 5 or 6. 8. The method according to claim 1, wherein the light diffusion layer is provided on at least one of an interface between the transparent substrate and the polarizing plate and an interface between the polarizing plate and the hard coat treatment plate. An upper transparent electrode plate for a touch panel according to Crab. 9. The light diffusion layer is an adhesive layer in which particles having a refractive index different from that of the adhesive component are dispersed in the adhesive component. Upper transparent electrode plate for touch panel. 10. The upper transparent electrode plate for a touch panel according to claim 9, wherein the difference between the refractive index of the adhesive component and the refractive index of the particles is 0.02 or more. 11. The upper transparent electrode plate for a touch panel according to claim 9, wherein the average particle size of the particles is 2 to 7 μm. 12. The upper transparent electrode plate for a touch panel according to claim 1, comprising an antireflection film provided on the upper surface of the hard coat layer. 13. The upper transparent electrode plate for a touch panel according to claim 1, wherein hard coat layers are formed on both surfaces of the support material. 14. The touch panel upper transparent electrode plate according to claim 1, further comprising a touch panel lower transparent electrode plate, wherein the touch panel lower transparent electrode plate is a transparent substrate. A transparent electrode layer formed on the upper surface thereof, and the transparent electrode layer of the upper transparent electrode plate and the transparent electrode layer of the lower transparent electrode plate are arranged to face each other at a predetermined interval. A touch panel characterized by. 15. A display device with a touch panel, wherein the touch panel according to claim 14 is arranged on a display surface of the display device.