JP2000029631A - Upper transparent electrode plate for touch panel and device provided with the same - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an upper transparent electrode plate for a touch panel with an excellent writing touch and a device provided with it. SOLUTION: In a display device 50 with the touch panel, the touch panel 30 is arranged on the display surface of the display device 40. For the touch panel 30 the transparent electrode layer 3 of this upper transparent electrode plate 10 and the transparent electrode layer 5 of a lower transparent electrode plate 20 are arranged so as to face each other with a prescribed interval. The upper transparent electrode plate 10 is provided with a transparent substrate 1, the transparent electrode layer 3 formed on the back surface of the transparent substrate 1 an antireflection layer 7 provided on the surface of the transparent substrate 1 and a frictional coefficient control layer 8 formed on the upper surface of the antireflection layer 7. The frictional coefficient control layer 8 is composed of an organic compound containing a perfluoroalkyl group.

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, and a CRT display device. The present invention relates to an upper transparent electrode plate for a touch panel used for a touch panel to be arranged, and an apparatus 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 a display surface of the display device. There are various types of touch panels currently used, and a resistive touch panel is most widely used.

A resistive touch panel has an upper transparent electrode plate comprising a transparent substrate and a transparent electrode layer formed on the lower surface thereof, and a lower transparent electrode plate comprising a transparent substrate and a transparent electrode layer formed on the upper surface thereof. The electrode plate is disposed so that the transparent electrode layers face each other with a predetermined space therebetween.

In the touch panel constructed as described above, when the transparent substrate of the upper transparent electrode plate is pressed with an input pen or a finger, the transparent substrate bends and the transparent electrode layer of the upper transparent electrode plate becomes lower transparent electrode at the pressed 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.

[0005] In such a touch panel used on a display surface of a conventional display device, an antireflection layer is provided on a transparent substrate of an upper transparent electrode plate.
It has been practiced to prevent reflection on the surface of a transparent electrode layer or the upper surface of a liquid crystal cell.

[0006]

However, when an anti-reflection layer is provided on a transparent substrate, when the input pen is used to press, the slip of the pen tip deteriorates, and the writing quality deteriorates. There was a problem.

An object of the present invention is to solve the above-mentioned problems and to provide an upper transparent electrode plate for a touch panel, which effectively prevents surface reflection and has good writing, and a device including the same.

[0008]

An upper transparent electrode plate for a touch panel according to the present invention is provided on a transparent substrate, a transparent electrode layer formed on a lower surface of the transparent substrate, and an upper surface of the transparent substrate. An anti-reflection layer and a friction coefficient control layer made of a perfluoroalkyl group-containing organic compound formed on the upper surface of the anti-reflection layer.

According to a second aspect of the present invention, there is provided an upper transparent electrode plate for a touch panel according to the first aspect of the invention, wherein the friction coefficient control layer is formed such that the dynamic friction coefficient is in the range of 0.02 to 0.1. It is characterized by being.

According to a third aspect of the present invention, there is provided an upper transparent electrode plate for a touch panel according to the first or second aspect of the invention, wherein the perfluoroalkyl group-containing organic compound is a perfluoroalkyl group-containing organic silane compound. It is characterized by.

According to a fourth aspect of the present invention, there is provided an upper transparent electrode plate for a touch panel according to any one of the first to third aspects, wherein the anti-reflection layer comprises two or more layers. The uppermost layer is a silicon oxide layer.

A touch panel according to a fifth aspect of the present invention further comprises a lower transparent electrode plate for a touch panel in addition to the upper transparent electrode plate for a touch panel according to any one of the first to fourth aspects. The plate includes a transparent substrate and a transparent electrode layer formed on the upper surface thereof, and the transparent electrode layer of the upper transparent electrode plate and the electrode layer of the lower transparent electrode plate are arranged so as to face each other at a predetermined interval. It is characterized by having.

A display device with a touch panel according to a sixth aspect of the invention is characterized in that the touch panel according to the fifth aspect is arranged on a display surface of the display device.

[0014]

FIG. 1 is a sectional view showing the structure of an example of an upper transparent electrode plate for a touch panel according to the present invention.

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. As the transparent resin plate, for example, acrylic resin,
Polycarbonate resin, cyclic polyolefin resin,
Those made of various resins such as polyethersulfone and polyarylate can be used. In addition, the transparent substrate 1
It is not limited to such a resin plate, but may be formed of a very thin transparent glass plate.

The transparent electrode layer 3 is formed of a thin film of a metal oxide such as ITO (oxide of indium / tin) or an oxide of tin / antimony or an extremely thin film of a metal such as gold, silver, palladium or aluminum. Vacuum deposition, ion beam deposition,
It is obtained by forming it on the lower surface of the transparent substrate 1 by using a sputtering method, an ion plating method or the like.

In the upper transparent electrode plate 10, an antireflection layer 7 is provided on the upper surface of the transparent substrate 1.
On the antireflection layer 7, a friction coefficient control layer 8 is formed.

The antireflection layer 7 may be a known one comprising a single layer or a multilayer thin film of an inorganic compound, and can be formed by a known method such as a vacuum deposition method, an ion plating method, and a sputtering method. For example, in a vacuum deposition method, a substrate to be coated is charged into a vacuum chamber, the degree of vacuum is usually set to 10 ⁻⁴ Torr or less, and a substance to be deposited is heated and evaporated by resistance heating, electron beam heating, or the like, and this evaporation is performed. A substance can condense on the substrate surface to form a thin film. In the sputtering method, glow discharge is usually performed between two electrodes at a low pressure of about 10 ⁻³ Torr, and the cathode material emitted by the glow discharge can be attached to the substrate. More specifically, Japanese Unexamined Patent Application Publication No.
JP-A-338901, JP-A-64-86101, and furthermore, JP-A-56-113101. Regarding the configuration of the antireflection layer 7, US Pat. No. 3,185,020 and US Pat.
No. 2,225 can be mentioned. As the anti-reflection layer, there is an organic anti-reflection film such as an anti-reflection film in which a polystyrene layer or the like is laminated (JP-A-6-344487). The anti-reflection layer used in the present invention comprises an inorganic compound layer. It is an anti-reflection layer.

Examples of the inorganic compound used as a material of the antireflection layer include silicon oxide such as silicon dioxide and silicon monoxide, yttrium oxide, aluminum oxide, and the like.
Metal oxides such as magnesium oxide, thorium oxide, tin oxide, lanthanum oxide, indium oxide, neodymium oxide, antimony oxide, zirconium oxide, cerium oxide, titanium oxide, bismuth oxide, calcium fluoride, sodium fluoride, lithium fluoride, Magnesium fluoride,
Lanthanum fluoride, neodymium fluoride, cerium fluoride,
Metal halides such as lead fluoride, zinc sulfide, cadmium sulfide, metal sulfides such as antimony trisulfide, metal selenides such as zinc selenide, cadmium telluride, metal tellurides such as lead telluride, silicon, germanium, Tellurium and the like can be mentioned.

The layer 8 made of a perfluoroalkyl group-containing organic compound is a coating layer formed on the antireflection layer 7 and functioning as a friction coefficient control layer. Preferably, the friction coefficient control layer 8 is formed so that the dynamic friction coefficient is in the range of 0.02 to 0.1. The dynamic friction coefficient is 0.
If it is larger than 1, the pen tip slips and the writing is not good, while if the dynamic friction coefficient is smaller than 0.02,
Conversely, the pen tip becomes too slippery and the writing taste worsens.

The organic compound containing a perfluoroalkyl group includes, for example, an organic silane compound containing a perfluoroalkyl group.

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

[0024]

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Among them, R _f in the general formula [Chemical Formula 1] is usually a linear or branched perfluoroalkyl group having 1 to 16 carbon atoms, and is preferably a CF ₃ group or a C ₂ F group.
₅ and C ₃ F ₇ groups. As the lower alkyl group for Y, one having 1 to 5 carbon atoms is usually mentioned. Examples of the hydrolyzable group for R ¹ include a halogen atom such as a chlorine atom, a bromine atom and an iodine atom, an R ³ O group, an R ³ COO group,
(R ⁴ ) ₂ C = C (R ³ ) CO group, (R ³ ) ₂ C = NO
Group, R ⁵ C = NO group, (R ⁴ ) ₂ N group, and R ³ CO
NR ⁴ group is preferred (wherein, R ³ is usually generally aromatic hydrocarbon group having 6 to 20 carbon atoms and an aliphatic hydrocarbon group or a phenyl group having 1 to 10 carbon atoms such as an alkyl group, R ⁴
Is usually a lower aliphatic hydrocarbon group having 1 to 5 carbon atoms such as a hydrogen atom or an alkyl group, and R ⁵ is a divalent aliphatic hydrocarbon group usually having 3 to 6 carbon atoms such as an alkylidene group).

More preferably, a chlorine atom, CH ₃ O
A C ₂ H ₅ O group. R ² is a hydrogen atom or an inert monovalent organic group, 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.
It is. m and n are integers of 0 to 2, 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 × 1.
0 ⁵ , preferably 1 × 10 ³ to 1 × 10 ⁴ .

Further, as a preferred structure of the silane compound represented by the above general formula [Chemical Formula 1], R _f is C ₃
An F ₇ group, a is an integer of 1 to 50, b, c and d are 0, e is 1, Z is a fluorine atom, compounds wherein n is 0, i.e. generally below There is a compound represented by the formula [Formula 2].

[0028]

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

A friction coefficient control layer 8 comprising the silane compound
Is formed on the antireflection layer 7 by spin coating, dip coating, roll coating, gravure coating, curtain flow coating, or the like. When applying,
Dilution with a solvent is preferred from the viewpoint of controlling the thickness of the layer comprising the silane compound and from the viewpoint of workability. Examples of the solvent include perfluorohexane, perfluoromethylcyclohexane, perfluoro-1,3-
Examples thereof include perfluoroaliphatic hydrocarbons having usually 5 to 12 carbon atoms such as dimethylcyclohexane, polyfluorinated aromatic hydrocarbons such as bis (trifluoromethyl) benzene, and polyfluorinated aliphatic hydrocarbons. The concentration of the silane compound in the coating solution is 0.05 to 0.5 W in the dip coating method.
t% is preferred.

A friction coefficient control layer 8 comprising the silane compound
Is preferably 0.001 to 0.03 μm from the viewpoint of a friction coefficient control effect and an antireflection effect.

FIG. 2 is a sectional view showing the structure of another example of the upper transparent electrode plate for a touch panel according to the present invention.

Referring to FIG. 2, in the upper transparent electrode plate 11 for the touch panel, the transparent substrate 1 and the anti-reflection layer 7 are provided.
, A hard coat layer 2 is interposed. In addition,
Other configurations are exactly the same as those of the upper transparent electrode plate for a touch panel 10 shown in FIG. 1, and thus description thereof is omitted.

Referring to FIG. 2, by forming the hard coat layer 2 on the surface of the transparent substrate 1 and covering the surface of the substrate 1, not only the surface hardness is increased, but also the anti-reflection layer is formed. Since the surface in contact with 7 is smooth, the adhesion of antireflection layer 7 is improved.

The hard coat layer 2 may be a known one used for this purpose. For example, a cured film obtained by polymerizing and curing a raw material containing a polyfunctional monomer as a main component can be used. Specifically, urethane-modified (meth) acrylic oligomer, esterified product of polyhydric alcohol and (meth) acrylic acid, acryloyl group such as polyether (meth) acrylate, and polyfunctional polymerizable compound containing two or more methacryloyl groups UV light compounds
Examples thereof include a layer polymerized and cured by an activation energy beam such as an electron beam, and a layer obtained by crosslinking and curing a silicon-based, melamine-based, or epoxy-based crosslinkable resin material by heat. Above all, in terms of durability and ease of handling, a layer obtained by curing a resin material composed of a urethane-modified acrylic oligomer by ultraviolet rays or electron beams, and a resin material composed of a silicon-based polyfunctional polymerizable compound were cured by heat. The layers are excellent.

The urethane-modified (meth) acrylate can be obtained by a urethane-forming reaction between a terminal isocyanate polyurethane and a (meth) acrylic acid derivative having a hydroxyl group. The terminal isocyanate polyurethane is produced by the reaction of a polyisocyanate such as hexamethylene diisocyanate, isophorone diisocyanate and the like with an oligomer having a plurality of hydroxyl groups such as polycaprolactone diol and polytetramethylene diol. Examples of the (meth) acrylic acid derivative having a hydroxyl group include 2-hydroxyethyl (meth) acrylate and 2-hydroxypropyl (meth) acrylate.

Examples of the polyhydric alcohol in the esterified product of the polyhydric alcohol and (meth) acrylic acid include ethylene glycol, polyethylene glycol, propylene glycol, polypropylene glycol, propanediol, butanediol, pentanediol, hexanediol and neopentyl. Glycol, 2-ethyl-
Dihydric alcohols such as 1,3-hexanediol, 2,2'-thiodiethanol and 1,4-cyclohexanedimethanol, trimethylolpropane, pentaglycerol, glycerol, pentaerythritol, diglycerol, and dipentaglycerol; Alcohols with a valency or higher. In addition, in order to impart flexibility to the obtained cured film and make it less likely to crack, in the production of an esterified product of a polyhydric alcohol and (meth) acrylic acid,
In addition to (meth) acrylic acid, a small amount of a polyunsaturated carboxylic acid may be added to form a mixed ester. Examples of the polyunsaturated carboxylic acid include succinic acid, tetrahydrophthalic acid, phthalic acid, maleic acid, fumaric acid, and itaconic acid.

The method for forming the hard coat layer 2 is as follows. First, the raw material is used in a usual coating operation, for example, by rotating the base material and dropping the coating material on the substrate. Spin coating to form a uniform coating, or dip coating to form a coating by immersing the substrate in a coating agent solution and pulling up at a constant speed, or to form a coating agent coating on rolls, Roll coating or gravure coating, in which the coating material of the roll is transferred onto the substrate by moving the substrate, or the coating agent is coated by flowing the coating agent down like a waterfall and passing the substrate underneath. (For example, “coating method” (Yuji Harasaki, Maki Shoten, 197)
Published October 30, 1997) and "Coating Machine and Peripheral Equipment" (Aoyama et al., Polymer Industrial Research Institute, Processing Technology Research Group,
(Published in February 1979)), and then, as described above, a method of curing by a method according to the raw materials used.

The thickness of the hard coat layer is preferably from 1 to 20 μm from the viewpoint of coating film strength, surface strength and optical characteristics.

FIG. 3 is a sectional view showing an example of a display device with a touch panel according to the present invention including the upper transparent electrode plate 10 shown in FIG.

Referring to FIG. 3, the display device with a touch panel 50 includes an upper transparent electrode plate 10 and a lower transparent electrode field 20.
The touch panel 30 having the above configuration is arranged on a display surface of a display device 40 such as a liquid crystal display device.

The lower transparent electrode plate 20 has 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 can be formed in the same manner as the transparent electrode layer 3 of the upper transparent electrode plate 20.

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

[0045]

EXAMPLES (Example 1) Formation of an anti-reflection layer A transparent substrate having a mask film mounted on one side was put into a vacuum evaporation tank of a vacuum evaporation apparatus (SYNCRON BMC-700), and the degree of vacuum was set to 2 × 10 ^{−. After 5} Torr, silicon dioxide, titanium dioxide, silicon dioxide, titanium dioxide, and silicon dioxide were deposited in this order by EB (electron beam) so that the thickness of each layer was 15, 15, 28, 107, and 90 nm. An antireflection layer was provided on a transparent substrate.

Preparation of Liquid for Controlling Friction Coefficient Using a fluorine-containing polyether represented by the following formula [Chemical Formula 3] as a raw material of Example 6 of JP-A-1-294709, CH _{2 was} prepared according to Example 4 of the same publication. = CHSiCl ₃
And the obtained iodine-containing silane compound is treated with zinc powder and methanol to give a number average molecular weight of about 5
000 silane compounds were obtained.

[0047]

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[0048]

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Specifically, in a 200 ml four-necked flask equipped with a stirrer, a dropping funnel, a reflux condenser and a thermometer, 40 g of the ω-fluoropolyperfluorooxetane iodine compound represented by the following formula [3] was added. Dissolved in 80 g of hexafluorotetrachlorobutane, and di-t
After 1.5 g (1 × 10 ^-2 mol) of -butyl peroxide was charged and the inside of the system was sufficiently purged with nitrogen, 16.1 g (0.1 mol) of vinyltrichlorosilane was added dropwise from a dropping funnel under a nitrogen stream. After completion of the dropwise addition, the temperature in the system was raised to 120 ° C., and the reaction was performed for 4 hours. After completion of the reaction, volatile matters were completely distilled off under reduced pressure to obtain 38.7 g of a silane compound having iodine at a terminal. Next, a solution prepared by dissolving 34.4 g of the silane compound in 50 g of perfluorohexane was charged into the same flask as above, and 2.1 g (3.2 × 10 ^-2 mol) of zinc was dispersed with vigorous stirring.
Cool the system in an ice water bath, and dry anhydrous methanol 10 g under a nitrogen stream.
Was added dropwise. After completion of the dropwise addition, the ice-water bath was removed, and the reaction was carried out for 2 hours under reflux. After completion of the reaction, insolubles were separated by filtration, and the lower layer was separated from the liquid phase separated into two layers using a separating funnel. After the obtained solution was washed three times with anhydrous methanol, the volatile components were completely distilled off under reduced pressure,
The terminally hydrogenated silane compound 3 represented by Chemical Formula 4
1.6 g were obtained.

From ¹ H-NMR, 1.2 to 3.0 ppm
A wide range of absorbers derived from each hydrogen atom of the following formula [Formula 5] has appeared. After adding 5.0 mol% of ω-fluoropolyperfluorooxetane hydride as an internal standard, the degree of polymerization P (average value of p in [Chemical Formula 2]) was calculated from the following formula (A) to be 2.0. Was.

[0051]

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I / I _s = {0.95 (3P + 1)} / 0.05 (A) I: integrated absorption intensity of 1.2 to 3.0 ppm I _s : integrated absorption intensity of internal standard substance p: polymerization Degree (average value of p in [Chemical Formula 2]) Next, the obtained silane compound was diluted with tetradecafluorohexane to prepare a liquid having a concentration of 0.1% by weight.

Formation of Friction Control Layer Made of Silane Compound on Antireflection Layer After covering the surface of the transparent substrate prepared above on which the antireflection layer is not provided with a mask film, controlling the friction coefficient prepared using the mask film It was immersed in the solution, pulled up at a speed of 15 cm / min, and applied. After the application, the solvent was volatilized at room temperature for 24 hours to evaporate the solvent to form a friction coefficient control layer on the surface of the antireflection layer, and the mask film was removed.

The upper transparent electrode plate for a touch panel thus obtained was subjected to a 170 g load using a polyacetal touch pen (0.8 mmR tip).
The dynamic friction coefficient was measured under the condition of 1 cm / sec.

As a result, the dynamic friction coefficient of the upper transparent electrode plate for a touch panel of Example 1 was 0.04. Also,
The pen tip slipped well and the writing taste was good.

Comparative Example 1 An upper transparent electrode plate for a touch panel was manufactured in exactly the same manner as in Example 1 except that the friction coefficient control layer was not formed on the antireflection layer.

With respect to the upper transparent electrode plate for a touch panel thus obtained, the dynamic friction coefficient was measured in the same manner as in Example 1.

As a result, the dynamic friction coefficient of the upper transparent electrode plate for a touch panel of Comparative Example 1 was 0.14. In addition, the pen tip slipped poorly and had a feeling of being caught, and the writing taste was not good.

[0059]

As described above, according to the present invention, the friction coefficient control layer made of a perfluoroalkyl group-containing organic compound is formed on the upper surface of the antireflection layer. Therefore, while surface reflection is effectively prevented,
A touch panel with good writing quality can be obtained.

[Brief description of the drawings]

FIG. 1 is a cross-sectional view illustrating a configuration of an example of an upper transparent electrode plate for a touch panel according to the present invention.

FIG. 2 is a cross-sectional view illustrating a configuration of another example of an upper transparent electrode plate for a touch panel according to the present invention.

FIG. 3 is a sectional view showing an example of a display device with a touch panel according to the present invention.

[Explanation of symbols]

 1,4 Transparent substrate 2 Hard coat layer 3,5 Transparent electrode layer 6 Spacer 7 Antireflection layer 8 Friction coefficient control layer 10,11 Upper transparent electrode plate 20 Lower transparent electrode plate 30 Touch panel 40 Display device 50 Display device with touch panel In the respective drawings, the same reference numerals indicate the same or corresponding parts.

Claims (6)

[Claims] 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; an anti-reflection layer provided on an upper surface of the transparent substrate; An upper transparent electrode plate for a touch panel, comprising: a friction coefficient control layer made of a perfluoroalkyl group-containing organic compound formed on an upper surface of an antireflection layer. 2. The upper transparent electrode plate for a touch panel according to claim 1, wherein the friction coefficient control layer is formed so that a dynamic friction coefficient is in a range of 0.02 to 0.1. . 3. The upper transparent electrode plate for a touch panel according to claim 1, wherein the perfluoroalkyl group-containing organic compound is a perfluoroalkyl group-containing organic silane compound. 4. The antireflection layer according to claim 1, wherein the antireflection layer is composed of two or more layers, and the uppermost layer of the two or more layers is a silicon oxide layer. An upper transparent electrode plate for a touch panel according to any of the above items. 5. In addition to the upper transparent electrode plate for a touch panel according to claim 1, further comprising a lower transparent electrode plate for a touch panel, wherein the lower transparent electrode plate for a touch panel comprises a transparent substrate and A transparent electrode layer formed on the upper surface thereof, wherein the transparent electrode layer of the upper transparent electrode plate and the electrode layer of the lower transparent electrode plate are arranged so as to face each other at a predetermined interval. Features a touch panel. 6. A display device with a touch panel, wherein the touch panel according to claim 5 is arranged on a display surface of the display device.