KR20180096476A - Image display device with position detection function - Google Patents

Abstract

An objective of the present invention is to provide an image display device (1A) with a position detecting function capable of suppressing glare without damaging a writing feeling by a touch pen and having good visibility of a display image. As a means for solving such a problem, the image display device (1A) with a position detecting function has at least a writing feeling improving layer (10) in contact with a touch pen, a display body module (4) having a color filter (44), and a light diffusion layer (30) provided in an arbitrary position between the writing feeling improving layer (10) and the display body module (4). The total haze from the writing feeling improving layer (10) to the light diffusion layer (30) is 12% or more and 45% or less. The distance between the light diffusion layer (30) and the color filter (44) is 4 mm or less.

Description

TECHNICAL FIELD [0001] The present invention relates to an image display apparatus having a position detection function,

The present invention relates to an image display apparatus having a position detection function in which a touch pen is used.

2. Description of the Related Art In recent years, an image display apparatus (touch panel) having a position detection function serving also as a display apparatus and an input means has been widely used in various electronic apparatuses. In such a touch panel, in addition to inputting by a finger, input is performed by a touch pen. According to the touch pen, an input operation finer than a finger and high in accuracy (accuracy) is possible. However, typically, the display module of the touch panel is rigid. Therefore, the writing feeling by the touch pen differs from the writing feeling when writing on a paper with a pencil or a pen, and it is difficult to say that it is good.

In order to solve the problem of the writing feeling by the touch pen in the touch panel, it has been studied to affix a film for improving the writing feeling (hereinafter also referred to as a "writing feeling improving film") on the outermost surface of the touch panel . As such a film, for example, Patent Document 1 discloses a film comprising a transparent base film and a plurality of line-shaped convex portions that form a mesh structure on at least one side of the transparent base film, And a linear convex portion occupying an area of 5 to 80% with respect to the entire surface of the touch film.

Japanese Patent Laid-Open Publication No. 2015-054417

However, in the conventional writing feeling improving film, scattering of the image light of the touch panel occurs, and a phenomenon in which the portion shines dazzlingly, so-called " glare " occurs.

It is an object of the present invention to provide an image display apparatus provided with a position detecting function which is made in view of the above-described facts and which is capable of suppressing glare without deteriorating the writing feeling by the touch pen and having good visibility of the display image .

In order to attain the above object, first, the present invention provides a writing feeling improving device comprising at least a writing feeling improving layer in contact with a touch pen, a display body module having a color filter, and a writing sensitivity improving layer at an arbitrary position between the writing feeling improving layer and the display body module Wherein a total haze from the writing feeling improving layer to the light diffusion layer is 12% or more and 45% or less, and a distance between the light diffusion layer and the color filter is 4 mm or less An image display apparatus with a detection function is provided (Invention 1). Here, the " writing feeling improving layer " in the present specification refers to a layer in which the writing feeling by the touch pen is improved as compared with the case where the writing feeling improving layer is not provided. For example, , And a layer that improves writing feel.

In the above invention (Invention 1), since the total haze and the distance between the light diffusion layer and the color filter are set as described above, the glare is suppressed and the visibility of the display image becomes good. In addition, the physical properties and composition described above do not impair the writing feel of the touch pen by the writing feeling improving layer.

In the above invention (Invention 1), it is preferable that the image display device with position detection function is provided with a base film, and the writing feeling improving layer is provided on one side of the base film (Invention 2).

In the above invention (Invention 1 or 2), the pen tip of the touch pen of the hard felt heart having a pen tip diameter of 0.5 mm is brought into contact with the surface of the writing feeling improving layer in contact with the touch pen in the vertical direction under a load of 3.92 N , The nib resistance is measured while moving at a speed of 100 mm / min in any one direction parallel to the surface of the writing feeling improving layer, and the obtained chart of the moving distance-to-nib resistance resistance is Fourier transformed and obtained from the frequency- The average value of the amplitudes in the frequency range of 1 to 2 Hz is not less than 1.0 and not more than 10 and the number of peaks of the amplitude is not less than 4 and not more than 30 (invention 3).

In the above invention (inventions 1 to 3), it is preferable that the writing feeling improving layer is a layer formed by curing a curing component and a coating composition containing fine particles (invention 4).

In the above invention (inventions 1 to 4), it is preferable that the light-diffusing layer is a layer formed of a sticky composition and a sticky composition containing light diffusion fine particles (invention 5).

In the above inventions (inventions 1 to 5), it is preferable that the light diffusion layer is provided adjacent to the display module (invention 6).

In the invention (Invention 2), it is preferable that the light diffusion layer is provided adjacent to the base film provided with the writing feeling improving layer (invention 7).

INDUSTRIAL APPLICABILITY The image display device with a position detection function according to the present invention does not impair the writing feeling by the touch pen, the glare is suppressed, and the visibility of the display image is good.

1 is a cross-sectional view of an image display apparatus having a position detection function according to a first embodiment of the present invention.
2 is a cross-sectional view of an image display apparatus having a position detection function according to a second embodiment of the present invention.
3 is a cross-sectional view of an image display apparatus having a position detection function according to a third embodiment of the present invention.
4 is a cross-sectional view of an image display apparatus having a position detection function according to a fourth embodiment of the present invention.
5 is a sectional view of an image display apparatus having a position detection function according to a fifth embodiment of the present invention.
6 is a cross-sectional view of an image display apparatus provided with a position detecting function used in a comparative example;
7 is a cross-sectional view of an image display apparatus having a position detection function used in a comparative example;

Hereinafter, an embodiment of the present invention will be described.

An image display apparatus (hereinafter sometimes referred to as a " touch panel ") having a position detection function according to an embodiment of the present invention includes at least a writing feeling enhancing layer in contact with a touch pen, a display body module having a color filter, And a light diffusion layer provided at an arbitrary position between the writing feeling improving layer and the display body module. Hereinafter, a specific example will be described.

[First Embodiment]

As shown in Fig. 1, the touch panel 1A according to the first embodiment of the present invention includes a writing feeling improving layer 10 in contact with a touch pen, A first pressure sensitive adhesive layer 22a for bonding the substrate film 21 to the base film 21 with the writing feeling improving layer 10 formed thereon and a second pressure sensitive adhesive layer 22b, A cover material 23 to which the base film 21 is bonded via the layer 22a and a second pressure sensitive adhesive layer 22b for bonding the cover material 23 and a second pressure sensitive adhesive layer 22b, A third pressure sensitive adhesive layer 22c for bonding the first touch sensor 24a to the cover material 23 and a second pressure sensitive adhesive layer 22c for bonding the first pressure sensitive adhesive layer 22c to the first pressure sensitive adhesive layer 22c via the third pressure sensitive adhesive layer 22c, A second touch sensor 24b bonded to the touch sensor 24a, a light diffusion layer 30 having adhesiveness for bonding the second touch sensor 24b, and a second touch sensor 24b via the light diffusion layer 30, The display body module 4, to which the display body module 24b is bonded, It consists.

As the display module 4, a liquid crystal (LCD) module, a light emitting diode (LED) module, an organic electroluminescence (organic EL) module or the like is usually used as long as it has a color filter. 1 shows, as an example, a liquid crystal module. The display body module 4 according to the present embodiment has the first glass substrate 41a adjacent to the light diffusion layer 30 and the module pressure sensitive adhesive layer 42 positioned below the first glass substrate 41a, A first polarizing plate 43a located below the module pressure-sensitive adhesive layer 42, a second glass substrate 41b located below the first polarizing plate 43a and a second polarizing plate 43b located below the second glass substrate 41b. A liquid crystal layer 45 positioned below the color filter 44, a third glass substrate 41c positioned below the liquid crystal layer 45, A second polarizing plate 43b positioned below the first polarizing plate 41c and a backlight 47 positioned below the second polarizing plate 43b.

1. Properties

In the touch panel 1A according to the present embodiment, the total haze from the writing feeling improving layer 10 to the light diffusion layer 30 is 12% or more and 45% or less. Since the total haze is 12% or more, the glare on the touch panel can be suppressed. In addition, the total haze is 45% or less, which makes it possible to suppress the color fade and blur of the display image, and to maintain good visibility of the display image. The total haze from the writing feeling improving layer 10 to the light diffusing layer 30 in the touch panel 1A according to the present embodiment is determined based on the writing feeling improving layer 10, the base film 21, The second touch sensor 24a and the second touch sensor 24b and the light diffusing layer 30 are stacked in this order on the first touch sensor 24a, the second touch sensor 24a, the second touch sensor 24a, the second touch sensor 24a, the cover member 23a, the second pressure sensitive adhesive layer 22b, (The sum of the internal haze and the external haze) of the whole body. The haze in this specification is a value measured in accordance with JIS K7136: 2000.

From the viewpoint of suppressing glare, the total haze is preferably at least 14%, particularly preferably at least 16%, more preferably at least 18%. From the viewpoint of the visibility of the displayed image, the total haze is preferably 42% or less, more preferably 40% or less, and even more preferably 38% or less.

In the touch panel 1A according to the present embodiment, the distance between the light diffusion layer 30 and the color filter 44 is 4 mm or less. The distance between the light diffusion layer 30 and the color filter 44 is a distance between the surface of the light diffusion layer 30 on the color filter 44 side and the surface of the light diffusion layer 30 on the color filter 44 And the distance between the surface and the surface. If the distance exceeds 4 mm, color fading or blurring occurs in the display image, and the visibility of the display image deteriorates. That is, since the distance is 4 mm or less, the visibility of the display image can be maintained satisfactorily.

From the viewpoint of the visibility of the displayed image, the distance is preferably 3 mm or less. On the other hand, the lower limit value of the distance is not particularly limited, but is usually 0.005 mm or more, preferably 0.01 mm or more.

The physical properties of the total haze and the distance between the light diffusion layer 30 and the color filter 44 do not impair the writing feel of the touch pen by the writing feeling improving layer 10. [

In the touch panel 1A according to the present embodiment, the pen tip of the touch pen of the hard felt heart having a pen tip diameter of 0.5 mm is pressed against the surface of the writing feeling improving layer 10 on which the touch pen comes into contact, (MN) was measured while moving at a speed of 100 mm / min in an arbitrary one direction parallel to the surface of the writing feeling improving layer 10, and the obtained moving distance (mm) the average value of the amplitudes in the frequency range of 1 to 2 Hz obtained from the frequency (Hz) -amplitude chart (-) obtained by performing the Fourier transform on the chart of the amplitude (Number of amplitudes) of not less than 4 and not more than 30 (the physical properties of this pen sliding test, hereinafter sometimes referred to as "writing sensitivity property"). The Fourier transform is performed using software (product name "Excel" manufactured by Microsoft Corporation). The average value of the amplitude and the number of the amplitudes fall within the above-mentioned ranges, whereby a desirable sense of resistance and friction are imparted to the writing feel by the touch pen. These feelings are matched, and the sense of writing of the touch pen approaches to the sense of writing on a paper with a pencil, and is excellent.

What is specified for the amplitude in the frequency range of 1 to 2 Hz is that when the vibration at the time of writing is grasped as a superposition of a plurality of vibrations having various frequencies, The inventors of the present invention have found out that the vibration is in the range of 1 to 2 Hz.

As the touch pen, for example, a polyacetal-based touch pen or the like can be used in addition to a hard-felt-seam touch pen having a pen tip diameter of 0.1 to 5 mm, and the above-described effect can be obtained by using any touch pen.

Here, the " pen resistance force " refers to the resistance force applied to the pen tip when the touch pen is moved under the above-described conditions. The " peak number " refers to the number of peaks having an amplitude of 1.5 or more in a frequency range of 1 to 2 Hz.

From the viewpoint of writing feel by the touch pen, the average value of the amplitude is particularly preferably 1.5 or more. The average value of the amplitudes is preferably 4 or less. The number of amplitudes is more preferably 5 or more, particularly preferably 6 or more, and more preferably 8 or more. The number of amplitudes is particularly preferably 20 or less, more preferably 15 or less.

From the viewpoint of further improving the writing feeling by the touch pen, the maximum value (maximum amplitude value) of the amplitude is preferably 1.3 or more, particularly preferably 2.0 or more, and more preferably 2.4 or more. The maximum value of the amplitude is preferably 10 or less, particularly preferably 8 or less, more preferably 5 or less.

A concrete method of obtaining the above-described chart of the moving distance (mm) - the nib resistance (mN) is as shown in a test example described later.

2. Each member

(1) A writing feeling improving layer

The writing feeling improving layer 10 in the present embodiment is a layer which improves the writing feeling of the touch pen, as compared with the case where the touch pen is directly used for the base film 21. The writing feeling improving layer 10 is preferably a coat layer formed by a coating composition on one side of the base film 21, but is not limited thereto.

(1-1) Material of the writing feeling improving layer

The writing feeling improving layer 10 of the touch panel 1A according to the present embodiment can improve the writing feel of the touch pen more than when the touch pen is used directly on the base film 21, It may be formed of any material, but it is preferably made of a material that satisfies the above-mentioned handwriting property. The writing feeling improving layer 10 in the present embodiment is preferably formed by curing the coating composition C described below. With the coating composition C, it is easy to form the writing feeling improving layer 10 that satisfies the above-mentioned writing sensitivity property.

The coating composition C in the present embodiment preferably contains a curable component and fine particles.

(1-1-1) Curable Component

The curable component is a component that is cured by a trigger such as an active energy ray or heat, and examples thereof include an active energy ray curable component, a thermosetting component, and the like. In the present embodiment, from the viewpoints of the hardness of the formed writing feeling improving layer 10 and the heat resistance of the base film 21, it is preferable to use an active energy ray curable component.

As the active energy ray-curable component, it is preferable that the active energy ray-curable component is cured by irradiation with an active energy ray to exhibit a predetermined hardness and capable of achieving the above-mentioned handwriting sensitivity property in relation to the fine particles.

Specific examples of the active energy ray curable component include a polyfunctional (meth) acrylate-based monomer, a (meth) acrylate-based prepolymer and an active energy ray-curable polymer. Or a (meth) acrylate-based prepolymer, and more preferably a polyfunctional (meth) acrylate-based monomer. The polyfunctional (meth) acrylate-based monomer and the (meth) acrylate-based prepolymer may be used alone or in combination. In the present specification, (meth) acrylate means both of acrylate and methacrylate. The same is true of other similar terms.

Examples of the polyfunctional (meth) acrylate monomer include 1,4-butanediol di (meth) acrylate, 1,6-hexanediol di (meth) acrylate, neopentyl glycol di (meth) (Meth) acrylates such as polyethylene glycol di (meth) acrylate, hydroxypivalic acid neopentyl glycol di (meth) acrylate, dicyclopentanyl di (meth) acrylate, caprolactone modified dicyclopentenyl Acrylates such as di (meth) acrylate, allyl cyclohexyl di (meth) acrylate, isocyanurate di (meth) acrylate, trimethylol propane tri (meth) acrylate, dipentaerythritol tri (Meth) acrylate modified with propionic acid, dipentaerythritol tri (meth) acrylate, pentaerythritol tri (meth) acrylate, propylene oxide modified trimethylol propane tri (Meth) acrylate, dipentaerythritol hexa (meth) acrylate, ethylene oxide modified dipentaerythritol hexa (metha) acrylate, capro (meth) acrylate, (Meth) acrylate such as lactone-modified dipentaerythritol hexa (meth) acrylate. These may be used singly or in combination of two or more kinds.

On the other hand, examples of the (meth) acrylate-based prepolymer include polyester acrylate-based, epoxyacrylate-based, urethane acrylate-based and polyol acrylate-based prepolymers.

Examples of the polyester acrylate-based prepolymer include a polyester oligomer obtained by esterifying a hydroxyl group of a polyester oligomer having a hydroxyl group at both terminals with (meth) acrylic acid obtained by condensation of a polyvalent carboxylic acid and a polyhydric alcohol, And then esterifying the terminal hydroxyl group of the oligomer obtained by adding the phenol oxide to (meth) acrylic acid.

The epoxy acrylate-based prepolymer can be obtained, for example, by reacting (meth) acrylic acid with an oxirane ring of a relatively low molecular weight bisphenol-type epoxy resin or novolac-type epoxy resin to effect esterification.

The urethane acrylate prepolymer can be obtained, for example, by esterifying a polyurethane oligomer obtained by the reaction of a polyether polyol or a polyester polyol with a polyisocyanate with (meth) acrylic acid.

The polyol acrylate-based prepolymer can be obtained, for example, by esterifying a hydroxyl group of a polyether polyol with (meth) acrylic acid.

The foregoing prepolymers may be used singly or in combination of two or more kinds.

It is also preferable to use an organic-inorganic hybrid resin as the active energy ray-curable component. The organic-inorganic hybrid resin is preferably a material obtained by bonding an organic compound having a polymerizable unsaturated group to a fine silica particle via a silane coupling agent or the like. The silica fine particles contained in the organic-inorganic hybrid resin have a function of a binder as a silica sol and are not included in the fine particles described later.

When the organic-inorganic hybrid resin is used, the above-mentioned handwriting property can be easily obtained by the action of silica sol. Therefore, even when spherical organic fine particles are used as fine particles to be described later, the writing sensitivity property is easily obtained, and thereby the optical characteristic of the formed writing feeling improving layer 10 can be improved.

(1-1-2) Fine Particles

The fine particles may be any of inorganic fine particles and organic fine particles. For example, inorganic fine particles are preferable from the viewpoint of imparting a high surface hardness to the writing feeling improving layer 10, and organic fine particles are preferable from the viewpoint of increasing the optical characteristic of the writing feeling improving layer 10. The shape of the fine particles may be spherical or non-spherical. In the case of the non-spherical shape, the shape may be indefinite or a shape having a high aspect ratio such as a needle shape or scaly shape. As used herein, the term " indefinite " refers to a shape not having a regular shape such as a sphere or an ellipse, but having a plurality of irregular corners or faces. The fine particles may be used singly or in combination of two or more.

Examples of the inorganic fine particles include metal oxides such as silica, aluminum oxide, zirconium oxide, titanium oxide, zinc oxide, germanium oxide, indium oxide, tin oxide, indium tin oxide (ITO), antimony oxide and cerium oxide; And metal fluorides such as magnesium fluoride, sodium fluoride, and the like. Of these, silica and aluminum oxide are preferable, silica is particularly preferable, and amorphous silica is more preferable because it gives high surface hardness and little influence on optical characteristics. The surface of the inorganic fine particles may be chemically modified with an organic compound or the like.

Examples of the organic fine particles include silicon fine particles, melamine resin fine particles, acrylic resin fine particles (e.g., polymethyl methacrylate resin fine particles), acryl-styrene type copolymer fine particles, polycarbonate fine particles, , Polystyrene-based fine particles, benzoguanamine-based resin fine particles, and the like. These resins may be crosslinked. Of these, acrylic resin microparticles are preferable from the viewpoint of optical properties and hardness, and polymethyl methacrylate resin microparticles are particularly preferable, spherical polymethyl methacrylate resin microparticles are more preferable, Spherical) crosslinked polymethyl methacrylate resin fine particles are most preferable.

In the present embodiment, it is preferable to use indefinite fine particles having an average particle diameter of 0.5 to 15 탆 and spherical fine particles having an average particle diameter of 1.7 to 15 탆 in order to obtain the aforementioned handwriting property.

The average particle diameter of the indefinite particles is preferably 0.5 mu m or more, particularly preferably 0.75 mu m or more, and more preferably 1.0 mu m or more. The average particle size of the indefinite particles is preferably 15 μm or less, more preferably 10 μm or less, particularly preferably 6 μm or less, and more preferably 3 μm or less. When the average particle size of the indefinite particles is in the above-mentioned range, the above-mentioned handwriting property is liable to be obtained. In the present specification, the average particle size of the fine particles is a value measured by a laser diffraction scattering type particle size distribution measuring apparatus.

The average particle diameter of the spherical fine particles is preferably 1.7 탆 or more, particularly preferably 2.0 탆 or more, and more preferably 2.5 탆 or more. The average particle diameter of the spherical fine particles is preferably 15 μm or less, more preferably 10 μm or less, particularly preferably 7 μm or less, and more preferably 5 μm or less. When the average particle diameter of the spherical fine particles is in the above-mentioned range, the above-mentioned handwriting property is liable to be obtained.

With respect to the particle size distribution of the fine particles, the coefficient of variation (CV value) of the particle diameter expressed by the following formula is preferably 20% or more, more preferably 40% or more, from the viewpoint that the writing feeling improving layer 10 forms the above- Or more, and more preferably 70% or more. From the same viewpoint, the CV value is preferably 200% or less, particularly preferably 175% or less, and more preferably 150% or less.

(CV value) (%) = (Standard deviation diameter / Average diameter) 占 100

The coefficient of variation (CV value) of the particle size is a value measured by a laser diffraction scattering type particle size distribution measuring apparatus (product name: "LA-920", manufactured by Horiba Seisakuho Co., Ltd.).

The content of the amorphous fine particles in the coating composition C is preferably 3% by mass or more, more preferably 4% by mass or more, particularly preferably 5% by mass or more, further preferably 7% by mass or more. The content of the amorphous fine particles is preferably 40 mass% or less, more preferably 35 mass% or less, particularly preferably 30 mass% or less, and most preferably 20 mass% or less. When the content of the indefinite particles is in the above-mentioned range, the above-mentioned handwriting property is liable to be obtained.

The content of the spherical fine particles in the coating composition C is preferably 3 mass% or more, particularly preferably 4 mass% or more, and more preferably 5 mass% or more. The content of the spherical fine particles is preferably 40 mass% or less, particularly preferably 35 mass% or less, and more preferably 30 mass% or less. When the content of the spherical fine particles is in the above-mentioned range, the above-mentioned handwriting property is liable to be obtained.

(1-1-3) Photopolymerization initiator

When ultraviolet rays are used as an active energy ray for curing the active energy ray curable component, the coating composition C preferably contains a photopolymerization initiator. By containing the photopolymerization initiator as described above, the active energy ray-curable component can be efficiently polymerized, and the polymerization curing time and the irradiation amount of ultraviolet rays can be reduced.

Examples of such photopolymerization initiators include benzoin, benzoin methyl ether, benzoin ethyl ether, benzoin isopropyl ether, benzoin-n-butyl ether, benzoin isobutyl ether, acetophenone, dimethylaminoacetophenone , 2,2-dimethoxy-2-phenylacetophenone, 2,2-diethoxy-2-phenylacetophenone, 2-hydroxy-2-methyl-1-phenylpropan- Phenyl) -2-morpholino-propan-1-one, 4- (2-hydroxyethoxy) phenyl-2- (hydroxy- 2-propyl) ketone, benzophenone, p-phenylbenzophenone, 4,4'-diethylaminobenzophenone, dichlorobenzophenone, 2-methyl anthraquinone, 2-ethyl anthraquinone, , 2-aminoanthraquinone, 2-methylthioxanthone, 2-ethylthioxanthone, 2-chlorothioxanthone, 2,4-dimethylthioxanthone, 2,4-diethylthioxanthone, benzyldimethylketal, acetophenone dimethylketal , p-dimethylaminoben 2-methyl-1- [4- (1-methylvinyl) phenyl] propanone], 2,4,6-trimethylbenzoyl-diphenyl-phosphine oxide, and the like . These may be used alone or in combination of two or more.

The content of the photopolymerization initiator in the coating composition C is preferably 0.01 parts by mass or more, particularly preferably 0.1 parts by mass or more, more preferably 1 part by mass or more, based on 100 parts by mass of the active energy ray curable component. The content of the photopolymerization initiator is preferably 20 parts by mass or less, particularly preferably 10 parts by mass or less, more preferably 5 parts by mass or less.

(1-1-4) Other components

The coating composition C may contain various additives in addition to the above-mentioned components. Examples of the various additives include various additives such as a leveling agent, an ultraviolet absorber, an antioxidant, a light stabilizer, an antistatic agent, a silane coupling agent, an antioxidant, a thermal agglomerator, a colorant, a surfactant, a storage stabilizer, a plasticizer, , Drawing improvement agent, and the like.

(1-2) Thickness of writing feeling improving layer

The thickness of the writing feeling improving layer 10 is preferably 0.5 占 퐉 or more, more preferably 0.7 占 퐉 or more, particularly preferably 1.0 占 퐉 or more, and more preferably 1.3 占 퐉 or more. The lower limit of the thickness of the writing feeling improving layer 10 makes it easy to satisfy the above-mentioned handwriting property and obtain good scratch resistance. The upper limit of the thickness of the writing feeling improving layer 10 is preferably 20 占 퐉 or less, more preferably 15 占 퐉 or less, and even more preferably 10 占 퐉 or less. The upper limit of the thickness of the writing feeling improving layer 10 is effectively prevented so that the incorporation of residual solvent or air bubbles due to the manufacturing process is effectively prevented and a good writing feeling improving layer 10 can be obtained, Is easily satisfied.

(2)

As the base film 21, a plastic film suitable for a touch panel in which a touch pen is used can be appropriately selected, and preferably a plastic film having good affinity with the writing feeling improving layer 10 is selected.

Examples of such plastic films include polyester films such as polyethylene terephthalate, polybutylene terephthalate and polyethylene naphthalate, polyolefin films such as polyethylene film and polypropylene film, cellophane films, diacetylcellulose film, triacetylcellulose film , Acetylcellulose butyrate film, polyvinyl chloride film, polyvinylidene chloride film, polyvinyl alcohol film, ethylene-vinyl acetate copolymer film, polystyrene film, polycarbonate film, polymethylpentene film, polysulfone film, polyetheretherketone A polymer film, a cyclic olefin polymer film, a cyclic conjugated diene polymer film, a vinyl alicyclic polymer film, a polyimide film, a polyimide film, a polyimide film, a polyetherimide film, a fluorine resin film, a polyamide film, an acrylic resin film, a polyurethane resin film, a norbornene polymer film, Formula A plastic film such as a hydrogenated polymer film, or a laminated film thereof. Of these, a polyethylene terephthalate film, a polycarbonate film, a norbornene polymer film and the like which can maintain a good writing feeling of the touch pen in combination with the above-described writing feeling improving layer 10 are preferable. Particularly preferred are polyethylene terephthalate A film is preferred.

In the base film 21, the base film 21 may be subjected to a primer treatment (for example, an adhesive layer or the like) on one surface or both surfaces as desired for the purpose of improving the adhesion with the layer (the writing feeling improving layer 10, , An oxidation method, an irregularization method, or the like. Examples of the oxidation method include a corona discharge treatment, a chromic acid treatment, a flame treatment, a hot air treatment, an ozone / ultraviolet ray treatment and the like. Examples of the irregularity method include a sandblast method and a solvent treatment method. These surface treatment methods are appropriately selected depending on the kind of the base film 21. As an example, a plastic film, particularly a polyethylene terephthalate film, on which the adhesive layer (easy adhesion layer) is formed by primer treatment is preferably used.

The thickness of the base film 21 is preferably 15 to 300 mu m, more preferably 30 to 200 mu m, and further preferably 90 to 150 mu m.

(3) Pressure-sensitive adhesive layer

The first pressure sensitive adhesive layer 22a, the second pressure sensitive adhesive layer 22b and the third pressure sensitive adhesive layer 22c may be formed by a desired pressure sensitive adhesive or pressure sensitive adhesive sheet, respectively. As the pressure-sensitive adhesive constituting these pressure-sensitive adhesive layers, those generally used for optical applications can be used, and examples thereof include acrylic pressure-sensitive adhesives, rubber pressure-sensitive adhesives, silicone pressure-sensitive adhesives, urethane pressure-sensitive adhesives, polyester pressure-sensitive adhesives and polyvinyl ether pressure- have. Among these, an acrylic pressure-sensitive adhesive which exhibits desired tackiness and is excellent in optical characteristics and durability is preferable.

The thickness of each of the first pressure sensitive adhesive layer 22a, the second pressure sensitive adhesive layer 22b and the third pressure sensitive adhesive layer 22c is preferably 5 to 1000 占 퐉, particularly preferably 7 to 500 占 퐉, Mu m.

(4) Cover material

The cover material 23 protects the touch sensors 24a and 24b of the touch panel 1A and the display unit module 4 and is usually constituted by a glass plate or a plastic plate as a main body. The glass plate is not particularly limited and includes, for example, chemically strengthened glass, alkali-free glass, quartz glass, soda lime glass, barium-strontium-containing glass, aluminum silicate glass, lead glass, borosilicate glass, barium borosilicate glass, have. The plastic plate is not particularly limited, and examples thereof include an acrylic plate and a polycarbonate plate made of polymethyl methacrylate.

A functional layer such as a hard coat layer, an antireflection layer, and an antiglare layer (antiglare layer) may be provided on one side or both sides of the glass plate or the plastic plate, and an optical member such as a hard coat film, an antireflection film, May be stacked.

In the present embodiment, the cover material 23 may have a stepped portion (not shown) on the side of the second pressure-sensitive adhesive layer 22b side with a printing layer or the like. This print layer is generally formed in a frame-like shape in plan view (in plan view).

The thickness of the cover material 23 is preferably 10 to 3000 mu m, particularly preferably 25 to 2000 mu m, and more preferably 50 to 1500 mu m.

(5) Touch sensor

The first touch sensor 24a and the second touch sensor 24b function as a function of detecting the position of the touch point in the touch panel 1A.

The touch sensors 24a and 24b are preferably composed of a transparent film and a patterned transparent conductive film, but the present invention is not limited thereto. The positional relationship between the transparent film and the transparent conductive film is not particularly limited.

The transparent film is not particularly limited, and for example, a polyethylene terephthalate film, a polyethylene naphthalate film, a polycarbonate film, a polymethyl methacrylate film, a triacetylcellulose film, a polypropylene film and the like are used.

Examples of the transparent conductive film include metals such as platinum, gold, silver and copper, oxides such as tin oxide, indium oxide, cadmium oxide, zinc oxide and zinc dioxide, indium tin oxide (ITO) And nonoxidized compounds such as indium, fluorine-doped indium oxide, antimony doped tin oxide, fluorine-doped tin oxide, and composite oxides such as aluminum-doped zinc oxide, chalcogenide, lanthanum pentoxide, titanium nitride and titanium carbide In particular, it is preferably made of tin-doped indium oxide (ITO).

The thickness of each of the touch sensors 24a and 24b is preferably 10 to 300 占 퐉, more preferably 15 to 250 占 퐉, and most preferably 20 to 200 占 퐉.

(6) Light diffusion layer

The light diffusion layer 30 in the present embodiment has adhesiveness for bonding the second touch sensor 24b and the display unit module 4 and is preferably composed of a pressure sensitive adhesive having light diffusibility. The light-diffusing layer having such adhesiveness may be referred to as a " sticky light-diffusing layer ".

(6-1) Material of light diffusion layer

The light-diffusing layer 30 is preferably formed of a sticky composition containing an adhesive component and light diffusion fine particles (hereinafter referred to as " sticky composition P ").

The adhesive component is not particularly limited as long as it exhibits desired tackiness in a touch panel or the like, has light transmittance, and does not inhibit the effect of the light diffusion fine particles. Examples of the adhesive component include an acrylic adhesive component, a rubber adhesive component, a silicone adhesive component, a polyurethane adhesive component, and a polyester adhesive component. Among them, the acrylic adhesive component is preferable from the viewpoints described above.

As the acrylic adhesive component, it is preferable to contain the (meth) acrylic acid ester polymer (A), and the (meth) acrylic acid ester polymer (A) crosslinked by the crosslinking agent (B) is particularly preferable. In the present specification, the term " polymer " includes the concept of " copolymer ".

(6-1-1) Synthesis of (meth) acrylic acid ester polymer (A)

The (meth) acrylic acid ester polymer (A) preferably contains a (meth) acrylic acid alkyl ester having 1 to 20 carbon atoms in the alkyl group as a monomer constituting the polymer. As a result, the obtained light diffusion layer 30 can exhibit desirable tackiness. The (meth) acrylic acid ester polymer (A) is obtained by copolymerizing a (meth) acrylic acid alkyl ester having 1 to 20 carbon atoms in the alkyl group and a monomer having a functional group (reactive functional group containing monomer) reacting with the crosslinking agent (B) It is particularly preferable that the copolymer is a copolymer with other monomers used in accordance with the present invention.

Examples of the (meth) acrylic acid alkyl ester having 1 to 20 carbon atoms in the alkyl group include methyl (meth) acrylate, ethyl (meth) acrylate, propyl (meth) acrylate, n-butyl (meth) acrylate, n-pentyl (meth) acrylate, n-hexyl (meth) acrylate, 2-ethylhexyl (meth) acrylate, isooctyl Stearyl (meth) acrylate, stearyl (meth) acrylate, and the like. Among them, (meth) acrylic acid esters having an alkyl group of 1 to 8 carbon atoms are preferable from the viewpoint of further improving the tackiness, and methyl (meth) acrylate, n-butyl (meth) acrylate and 2-ethylhexyl Is particularly preferable. These may be used alone or in combination of two or more kinds.

The (meth) acrylic acid ester polymer (A) preferably contains 30 to 95 mass% of a (meth) acrylic acid alkyl ester having 1 to 20 carbon atoms in the alkyl group as the monomer unit constituting the polymer, By mass, particularly preferably 50 to 85% by mass.

Examples of the reactive functional group-containing monomer include a monomer having a hydroxyl group in the molecule (a hydroxyl group-containing monomer), a monomer having a carboxyl group in the molecule (a carboxyl group-containing monomer), and a monomer having an amino group in the molecule (an amino group-containing monomer).

Examples of the hydroxyl group-containing monomer include 2-hydroxyethyl (meth) acrylate, 2-hydroxypropyl (meth) acrylate, 3-hydroxypropyl (meth) acrylate, 2-hydroxybutyl (Meth) acrylate such as 3-hydroxybutyl (meth) acrylate and 4-hydroxybutyl (meth) acrylate. Among them, 2-hydroxyethyl (meth) acrylate is preferable from the viewpoint of the reactivity of the hydroxyl group in the obtained (meth) acrylic acid ester polymer (A) with the crosslinking agent (B) and the copolymerization with other monomers. These may be used alone or in combination of two or more.

Examples of the carboxyl group-containing monomer include ethylenically unsaturated carboxylic acids such as acrylic acid, methacrylic acid, crotonic acid, maleic acid, itaconic acid and citraconic acid. These may be used alone or in combination of two or more.

Examples of the amino group-containing monomer include aminoethyl (meth) acrylate and n-butylaminoethyl (meth) acrylate. These may be used alone or in combination of two or more.

When the (meth) acrylic acid ester polymer (A) contains a monomer having a reactive functional group as a monomer constituting the polymer, the content thereof is preferably 5 to 35 mass%, particularly preferably 10 to 30 mass% , And more preferably 20 to 25 mass%.

The (meth) acrylic acid ester polymer (A) may contain other monomers as monomer units constituting the polymer, if desired. As other monomers, monomers that do not contain a reactive functional group are preferable. Examples of such other monomers include (meth) acrylic acid alkoxyalkyl esters such as methoxyethyl (meth) acrylate and ethoxyethyl (meth) acrylate, (meth) acrylic acid having an aliphatic ring such as (meth) (Meth) acrylic acid ester having a non-cross-linkable tertiary amino group such as (meth) acrylic acid, N, N-dimethylaminoethyl, N, N-dimethylaminopropyl (meth) acrylate, vinyl acetate and styrene . These may be used alone or in combination of two or more.

The polymerization of the (meth) acrylic acid ester polymer (A) may be a random copolymer or a block copolymer.

The weight average molecular weight of the (meth) acrylic acid ester polymer (A) is preferably 100,000 to 200,000, particularly preferably 200,000 to 1,300,000, and more preferably 300,000 to 800,000. In the present specification, the weight average molecular weight is a value in terms of standard polystyrene measured by a gel permeation chromatography (GPC) method.

In the sticky composition P, the (meth) acrylic acid ester polymer (A) may be used singly or in combination of two or more kinds.

(6-1-2) Crosslinking agent (B)

When the adhesive component of the adhesive composition P contains the (meth) acrylic acid ester polymer (A) containing the reactive functional group-containing monomer as the monomer unit constituting the polymer and the crosslinking agent (B), when the adhesive composition P is heated , The crosslinking agent (B) reacts with the reactive functional group of the reactive functional group-containing monomer constituting the (meth) acrylic acid ester polymer (A). Thereby, a structure in which the (meth) acrylic acid ester polymer (A) is crosslinked is formed by the crosslinking agent (B), and the strength and durability of the light diffusion layer (30) are improved.

The crosslinking agent (B) is not particularly limited as long as it can react with the reactive functional group possessed by the (meth) acrylic acid ester polymer (A), and examples thereof include isocyanate crosslinking agents, epoxy crosslinking agents, amine crosslinking agents, melamine crosslinking agents, aziridine crosslinking agents, Based crosslinking agent, an aldehyde-based crosslinking agent, an oxazoline-based crosslinking agent, a metal alkoxide-based crosslinking agent, a metal chelating-type crosslinking agent, a metal salt-based crosslinking agent, and an ammonium salt-based crosslinking agent. Among the above, it is preferable to use an isocyanate-based crosslinking agent having excellent reactivity with a hydroxyl group when the reactive functional group contained in the (meth) acrylic acid ester polymer (A) is a hydroxyl group, When the reactive functional group is a carboxyl group, it is preferable to use an epoxy crosslinking agent having excellent reactivity with a carboxyl group. The crosslinking agent (B) may be used alone or in combination of two or more.

The isocyanate crosslinking agent includes at least a polyisocyanate compound. Examples of the polyisocyanate compound include aromatic polyisocyanates such as tolylene diisocyanate, diphenylmethane diisocyanate and xylylene diisocyanate, aliphatic polyisocyanates such as hexamethylene diisocyanate, isophorone diisocyanate, hydrogenated diphenylmethane di Alicyclic polyisocyanates such as isocyanate and the like, and their reaction products with low-molecular active hydrogen-containing compounds such as buret, isocyanurate, ethylene glycol, propylene glycol, neopentyl glycol, trimethylol propane, Duct bodies, and the like. Among them, trimethylolpropane-modified aromatic polyisocyanates, especially trimethylolpropane-modified tolylene diisocyanate and trimethylolpropane-modified xylylene diisocyanate are preferable from the viewpoint of reactivity with hydroxyl groups.

Examples of the epoxy crosslinking agent include 1,3-bis (N, N'-diglycidylaminomethyl) cyclohexane, N, N, N ', N'-tetraglycidyl-m- , Ethylene glycol diglycidyl ether, 1,6-hexanediol diglycidyl ether, trimethylol propane diglycidyl ether, diglycidyl aniline, diglycidyl amine and the like.

The content of the crosslinking agent (B) in the adhesive composition P is preferably 0.001 to 10 parts by mass, particularly preferably 0.01 to 5 parts by mass, relative to 100 parts by mass of the (meth) acrylic acid ester polymer (A) More preferably 1 part by mass.

(6-1-3) Light diffusion fine particles

The light diffusing fine particles may be any of those capable of setting the total haze within the above-mentioned range, for example, inorganic fine particles such as silica, calcium carbonate, aluminum hydroxide, magnesium hydroxide, clay, talc and titanium dioxide; Acrylic resin such as polymethyl methacrylate resin, organic light-transmitting fine particles such as polystyrene resin, polymethyl methacrylate-polystyrene copolymer, polyethylene resin, and epoxy resin; And fine particles made of a silicon-containing compound having an intermediate structure of inorganic and organic (for example, a tosphal series of Momentive Performance Materials Japan Co., Ltd.), such as a silicone resin. Among them, fine particles composed of acrylic resin fine particles, polymethyl methacrylate-polystyrene copolymer fine particles, and silicon-containing compounds having an intermediate structure of inorganic and organic are excellent in dispersibility with respect to the above adhesive component, Properties are obtained. The above-mentioned light diffusion fine particles may be used singly or in combination of two or more kinds.

As the shape of the light diffusion fine particles, a spherical shape, particularly a spherical shape fine particle, in which light diffusion is uniform is preferable. The average particle diameter of the light diffusion fine particles by the laser diffraction method is preferably 0.1 mu m or more, particularly preferably 1 mu m or more, and more preferably 2 mu m or more. The average particle diameter is preferably 20 占 퐉 or less, more preferably 10 占 퐉 or less, and most preferably 8 占 퐉 or less. When the average particle diameter is within the above-mentioned range, the total haze value can be easily set within the above-mentioned range without interfering with the light transmittance of the light diffusing layer 30.

The average particle diameter measured by the laser diffraction method was a value measured by a laser diffraction scattering particle size distribution measuring device in which 1.2 g of fine particles and 98.8 g of isopropyl alcohol were sufficiently stirred.

When the adhesive composition P contains the (meth) acrylic acid ester polymer (A) as an adhesive component, the content of the light diffusion fine particles is preferably 0.01 part by mass or more based on 100 parts by mass of the (meth) acrylic acid ester polymer (A) , And particularly preferably at least 0.1 part by mass. The content of the light diffusion fine particles is preferably 15 parts by mass or less, particularly preferably 10 parts by mass or less, and more preferably 5 parts by mass or less. When the content of the light diffusion fine particles is within the above-mentioned range, the total haze value can be easily set within the above-mentioned range without interfering with the light transmittance of the light diffusion layer 30. [ Further, it is easy to sufficiently exhibit adhesiveness to another member adjacent to the light diffusion layer 30, and it is possible to prevent the occurrence of problems such as inadvertent peeling. The content of the light diffusion fine particles is preferably in the above-described range with respect to 100 parts by mass of the adhesive component, even if the adhesive component is other than the acrylic adhesive component.

(6-1-4) Various additives

The adhesive composition P may contain various additives such as a silane coupling agent, a refractive index adjuster, an antistatic agent, a tackifier, an antioxidant, an ultraviolet absorber, a light stabilizer, a softening agent, a filler and the like, if desired.

(6-2) Production of sticky composition

The sticky composition P can be produced by mixing an adhesive component, light diffusion fine particles and, if desired, additives. When the adhesive component contains the (meth) acrylic acid ester polymer (A), the (meth) acrylic acid ester polymer (A) is first prepared, and the crosslinking agent (B) is blended if desired.

The (meth) acrylic acid ester polymer (A) can be produced by polymerizing a mixture of monomer units constituting the polymer by a conventional radical polymerization method. The polymerization of the (meth) acrylic acid ester polymer (A) can be carried out by a solution polymerization method or the like using a polymerization initiator, if desired. As the polymerization solvent, for example, ethyl acetate, n-butyl acetate, isobutyl acetate, toluene, acetone, hexane, methyl ethyl ketone and the like may be used.

Examples of the polymerization initiator include an azo compound, an organic peroxide, and the like, and two or more of them may be used in combination. Examples of the azo compound include azo compounds such as 2,2'-azobisisobutyronitrile, 2,2'-azobis (2-methylbutyronitrile), 1,1'-azobis (cyclohexane 1-carbonyl Azobis (2,4-dimethyl-4-methoxy valeronitrile), 2,2'-azobis (2,4-dimethylvaleronitrile) Azobis (2-methylpropionate), 4,4'-azobis (4-cyanovaleric acid), 2,2'-azobis (2-hydroxymethylpropionitrile) Azobis [2- (2-imidazolin-2-yl) propane] and the like.

Examples of the organic peroxide include benzoyl peroxide, t-butyl perbenzoate, cumene hydroperoxide, diisopropyl peroxydicarbonate, di-n-propyl peroxydicarbonate, di (2-ethoxyethyl) peroxydicarbonate , t-butyl peroxyneodecanoate, t-butyl peroxypivalate, (3,5,5-trimethylhexanoyl) peroxide, dipropionyl peroxide, and diacetyl peroxide.

In the polymerization step, a weight average molecular weight of the obtained polymer can be controlled by blending a chain transfer agent such as 2-mercaptoethanol.

(B) and additives are added to the solution of the (meth) acrylic acid ester polymer (A) and, if desired, the light diffusion fine particles and, if desired, the crosslinking agent (B) To obtain a viscous composition P (coating liquid) which is diluted with water.

Examples of the diluting solvent include aliphatic hydrocarbons such as hexane, heptane and cyclohexane, aromatic hydrocarbons such as toluene and xylene, halogenated hydrocarbons such as methylene chloride and ethylene chloride, alcohols such as methanol, ethanol, propanol, Propanol and the like; ketones such as acetone, methyl ethyl ketone, 2-pentanone, isophorone and cyclohexanone; esters such as ethyl acetate and butyl acetate; and cellosolve solvents such as ethyl cellosolve Is used.

The concentration and viscosity of the coating liquid prepared as described above are not particularly limited and may be appropriately selected depending on the situation. For example, it is diluted such that the concentration of the sticky composition P is 10 to 40% by mass. In order to obtain a coating liquid, the addition of a diluting solvent or the like is not a necessary condition, and a diluting solvent may not be added if the viscous composition P is a coating-compatible viscosity or the like.

(6-3) Thickness of light diffusing layer

The thickness of the light-diffusing layer 30 (measured in accordance with JIS K7130) is preferably at least 5 mu m, more preferably at least 7.5 mu m, and most preferably at least 10 mu m. The upper limit value is preferably 500 탆 or less, more preferably 250 탆 or less, particularly preferably 100 탆 or less, and more preferably 50 탆 or less. The lower limit of the thickness of the light-diffusing layer 30 makes it possible to achieve both desired tackiness and optical characteristics. On the other hand, since the upper limit of the thickness of the light diffusion layer 30 is set as described above, unnecessary thickening of the resulting touch panel 1A can be suppressed. The light-diffusing layer 30 may be formed as a single layer, or may be formed by laminating a plurality of layers.

(7) Display module

The display unit module 4 in this embodiment is a liquid crystal module having the above-described configuration as an example. The first adhesive agent layer 42, the first polarizer 43a, and the second glass substrate 41b, which are constituted by the display body module 4 or the display body module 4, that is, the first glass substrate 41a, the module pressure- A color filter 44, a liquid crystal layer 45, a third glass substrate 41c, a second polarizing plate 43b and a backlight 47 can be used.

As described above, in the touch panel 1A according to the present embodiment, the distance between the light diffusion layer 30 and the color filter 44 is 4 mm or less. When the display body module 4 is used, the distance is the total thickness of the first glass substrate 41a, the module pressure-sensitive adhesive layer 42, the first polarizing plate 43a, and the second glass substrate 41b. The thicknesses of the first glass substrate 41a and the second glass substrate 41b are usually 0.1 to 3000 m, and preferably 0.3 to 1500 m, respectively. The thickness of the module pressure-sensitive adhesive layer 42 is usually 1 to 1000 占 퐉, preferably 5 to 750 占 퐉. The thickness of the first polarizing plate 43a is usually 1 to 1000 占 퐉, preferably 3 to 750 占 퐉. The thickness of each member is selected so that the distance between the light diffusion layer 30 and the color filter 44 becomes 4 mm or less.

3. Manufacturing method of touch panel

The touch panel 1A according to the present embodiment can be manufactured by an ordinary method, but an example of a preferable manufacturing method will be described.

(1) Formation of writing feeling improving layer

The writing feeling improving layer 10 is formed on the base film 21. Specifically, a coating composition for a writing feeling improving layer 10, preferably a coating composition C and, if desired, a coating solution containing a solvent is applied to the base film 21 and cured to form a writing feeling improving layer 10 ).

The solvent can be used for improvement of coatability, adjustment of viscosity, adjustment of solid content concentration, and the like can be used without particular limitation as long as the curable component or the like dissolves and fine particles are dispersed.

Specific examples of the solvent include alcohols such as methanol, ethanol, isopropanol, butanol, and octanol; Ketones such as acetone, methyl ethyl ketone, methyl isobutyl ketone, and cyclohexanone; Esters such as ethyl acetate, butyl acetate, ethyl lactate and? -Butyrolactone; Ethers such as ethylene glycol monomethyl ether (methyl cellosolve), ethylene glycol monoethyl ether (ethyl cellosolve), diethylene glycol monobutyl ether (butyl cellosolve) and propylene glycol monomethyl ether; Aromatic hydrocarbons such as benzene, toluene and xylene; And amides such as dimethylformamide, dimethylacetamide and N-methylpyrrolidone.

The application of the coating liquid of the coating composition may be carried out by a conventional method and may be carried out by, for example, a bar coating method, a knife coating method, a roll coating method, a blade coating method, a die coating method or a gravure coating method. When the application liquid of the coating composition is applied, it is preferable to dry the coating film at 40 to 120 DEG C for 30 seconds to 5 minutes.

When the coating composition is an active energy ray-curable material such as the coating composition C, curing of the coating composition is performed by irradiating the coating film of the coating composition with active energy rays such as ultraviolet rays and electron beams. The ultraviolet ray irradiation can be performed by a high-pressure mercury lamp, a fusion H lamp, a xenon lamp, etc., and the irradiation amount of ultraviolet rays is preferably about 50 to 1,000 mW / cm 2 and 50 to 1,000 mJ / On the other hand, the electron beam irradiation can be performed by an electron beam accelerator or the like, and the irradiation amount of the electron beam is preferably about 10 to 1000 krad.

(2) Formation of light diffusion layer

The light-diffusing layer 30 is preferably formed on the peeling surface (peelable surface) of the peeling sheet to form a light-diffusing layer sheet. The light-diffusing layer 30 in the present embodiment is preferably formed of a sticky composition P. Therefore, preferably, the application liquid containing the adhesive composition P and a solvent as desired is applied to the release surface of the release sheet and heat treatment is performed to form the application layer. When the curing period is required, the curing period is set so that, when the curing period is unnecessary, the coated layer becomes the light-diffusing layer 30, and the light-diffusing layer sheet is obtained. The heat treatment may also serve as a drying treatment for volatilizing the solvent of the adhesive composition P or the like.

When the adhesive composition P contains the (meth) acrylic acid ester polymer (A), the heating temperature for the heat treatment is preferably 50 to 150 占 폚, particularly preferably 70 to 120 占 폚. The heating time is preferably 30 seconds to 10 minutes, and more preferably 50 seconds to 2 minutes. After the heat treatment, a curing period of about 1 to 2 weeks may be provided at room temperature (for example, at 23 DEG C and 50% RH), if necessary. When the curing period is necessary, after the curing period, when the curing period is unnecessary, the light diffusion layer 30 is formed after the completion of the heating process.

The application method of the application liquid containing the solvent for mixing with the sticky composition P and the sticky composition P is the same as the application method of the solvent or the application liquid of the coating composition for the writing feeling improving layer 10.

(3) Formation of a pressure-sensitive adhesive layer

The first pressure sensitive adhesive layer 22a, the second pressure sensitive adhesive layer 22b and the third pressure sensitive adhesive layer 22c are preferably formed on the release face of the release sheet to form a pressure sensitive adhesive sheet. For example, a pressure-sensitive adhesive sheet is obtained by applying a coating liquid containing a pressure-sensitive adhesive composition for each pressure-sensitive adhesive layer and, if desired, a solvent, to the release surface of the release sheet and drying the pressure-sensitive adhesive layer.

(4) Lamination of each member

The lamination of the respective members may be performed manually by using a pressing roller, or automatically by using a laminator apparatus. The order of laminating the respective members is not particularly limited, and the following methods are merely examples.

The first pressure sensitive adhesive layer 22a of the pressure sensitive adhesive sheet of the first pressure sensitive adhesive layer 22a is first formed on the side of the writing sensitivity improving layer 10 of the base film 21 on which the writing sensitivity improving layer 10 is formed Is laminated on the surface opposite to the surface of the substrate. Then, the release sheet is peeled off, and the exposed first pressure-sensitive adhesive layer 22a is bonded to the cover material 23. [

On the other hand, the third pressure sensitive adhesive layer 22c of the pressure sensitive adhesive sheet of the third pressure sensitive adhesive layer 22c is laminated on the first touch sensor 24a. Then, the peeling sheet of the pressure sensitive adhesive sheet of the third pressure sensitive adhesive layer 22c is peeled off, and the exposed third pressure sensitive adhesive layer 22c is bonded to the second touch sensor 24b. Next, the second pressure-sensitive adhesive layer 22b of the pressure-sensitive adhesive sheet of the second pressure-sensitive adhesive layer 22b is applied to the surface of the first touch sensor 24a opposite to the side of the third pressure-sensitive adhesive layer 22c It merges. The light diffusing layer 30 of the light diffusing layer sheet is bonded to the surface of the second touch sensor 24b opposite to the side of the third pressure sensitive adhesive layer 22c.

Next, the release sheet is peeled from the pressure-sensitive adhesive sheet of the second pressure-sensitive adhesive layer 22b and the exposed second pressure-sensitive adhesive layer 22b is removed from the side of the cover material 23 opposite to the side of the first pressure- . Finally, the release sheet is peeled from the light-diffusing layer sheet, and the exposed light-diffusing layer 30 is bonded to the first glass substrate 41a of the display module 4. Thus, the touch panel 1A shown in Fig. 1 is manufactured.

The touch panel 1A described above has excellent writing feel by the touch pen, suppresses glare, and has good visibility of a display image.

[Second embodiment]

In the touch panel 1A according to the first embodiment described above, the light diffusion layer 30 is provided at a position adjacent to the display unit module 4, but the present invention is not limited to this, and the writing feeling improving layer 10 and the display body module 4. The display body module 4 may be provided at any position between the display body module 10 and the display body module 4. [

For example, the light diffusion layer 30 may be provided between the base film 21 and the cover material 23 like the touch panel 1B according to the second embodiment shown in Fig. In this case, in the touch panel 1A according to the first embodiment, the first pressure sensitive adhesive layer 22a is replaced with the light diffusion layer 30, and at the position where the light diffusion layer 30 was present, (22d) is provided. The fourth pressure sensitive adhesive layer 22d may have the same structure as the first pressure sensitive adhesive layer 22a, the second pressure sensitive adhesive layer 22b or the third pressure sensitive adhesive layer 22c described above.

In the touch panel 1B according to the present embodiment as well, the total haze from the writing feeling improving layer 10 to the light diffusion layer 30 (in this embodiment, the writing feeling improving layer 10, the base film 21, And the total haze of the light diffusion layer 30 should be 12% or more and 45% or less and the distance between the light diffusion layer 30 and the color filter 44 should be 4 mm or less.

It is preferable that the light diffusion layer 30 of the touch panel 1B according to the present embodiment is basically the same as the light diffusion layer 30 of the touch panel 1A according to the first embodiment. However, the light diffusion fine particles in the adhesive composition P are preferably light diffusion fine particles composed of a silicon-containing compound having an intermediate structure of organic and inorganic, such as silicone resin. The content of the light diffusion fine particles in the adhesive composition P is preferably 0.01 parts by mass or more, particularly preferably 0.1 parts by mass or more, and more preferably 0.5 parts by mass or less, relative to 100 parts by mass of the (meth) acrylic acid ester polymer (A) Or more. The content of the light diffusion fine particles is preferably 15 parts by mass or less, particularly preferably 12 parts by mass or less, and more preferably 10 parts by mass or less. When the content of the light diffusion fine particles is within the above-mentioned range, the total haze value can be easily set within the above-mentioned range without interfering with the light transmittance of the light diffusion layer 30. [ Further, it is easy to sufficiently exhibit adhesiveness to other members adjacent to the light-diffusing layer 30, and occurrence of defects such as inadvertent peeling can be prevented.

The manufacturing of the touch panel 1B according to the present embodiment can basically be performed in the same manner as the touch panel 1A according to the first embodiment. The light diffusion layer 30 can be laminated on the base film 21 by using a light diffusion layer sheet similarly to the touch panel 1A according to the first embodiment.

The position of the light diffusion layer 30 in the touch panel is not limited to the positions in the touch panel 1A according to the first embodiment and the touch panel 1B according to the second embodiment. For example, the second pressure sensitive adhesive layer 22b or the third pressure sensitive adhesive layer 22c in the touch panel 1A according to the first embodiment may be replaced with a light diffusion layer. In this case, the light-diffusing layer 30 in the touch panel 1A according to the first embodiment can be made of the same pressure-sensitive adhesive layer as the first to third pressure-sensitive adhesive layers 22a to 22c.

The light diffusing layer 30 may be provided between the writing feeling improving layer 10 and the base film 21 so as to be adjacent to the writing feeling improving layer 10, for example. Such a touch panel can basically be manufactured in the same manner as the touch panel 1A according to the first embodiment. However, after the light diffusion layer 30 is laminated on the base film 21, And the writing feeling improving layer 10 is formed on the substrate 10. The light diffusion layer 30 can be laminated on the base film 21 by using a light diffusion layer sheet similarly to the touch panel 1A according to the first embodiment. When the light diffusing layer 30 is provided between the writing feeling improving layer 10 and the base film 21, the light diffusing layer 30 may not have adhesiveness. In this case, for example, the light diffusion layer 30 may be formed using a coating composition containing fine particles and a curable component such as an active energy ray curable component, a thermosetting component, and the like in the same manner as the writing feeling improving layer 10.

[Third embodiment]

In the touch panel 1A according to the first embodiment described above, the first touch sensor 24a and the second touch sensor 24b located outside the display body module 4 are responsible for the position detection function , But the present invention is not limited thereto, and the display module may have a position detecting function.

For example, like the touch panel 1C according to the third embodiment shown in Fig. 3, the writing feeling improving layer 10 and the writing feeling improving layer 10 on the side where the touch pen does not contact , A base film 21 on which the writing feeling improving layer 10 is formed and a pressure sensitive adhesive layer 22 for bonding the base film 21 to the base film 21 via the pressure sensitive adhesive layer 22, A cover material 23 having a position detection function in which the cover material 23 is bonded to the cover material 23 via the light diffusing layer 30 and the light diffusing layer 30 having adhesiveness for bonding the cover material 23, And the display body module 5 may be provided.

The display module 5 is not particularly limited as long as it has a color filter and a position detecting function (touch sensor), and usually includes a liquid crystal (LCD) module, a light emitting diode (LED) module, an organic electroluminescence EL) module and the like are used. In Fig. 3, a liquid crystal module is shown as an example. The display module 5 according to the present embodiment includes a first glass substrate 51a adjacent to the light diffusion layer 30 and a first module pressure-sensitive adhesive layer (not shown) disposed below the first glass substrate 51a A first polarizing plate 53a located below the first module pressure-sensitive adhesive layer 52a, a second glass substrate 51b located below the first polarizing plate 53a, A liquid crystal layer 55 located below the color filter 54 and a second module pressure sensitive adhesive layer 52b located below the liquid crystal layer 55. The color filter 54, A first touch sensor 56a positioned below the second module pressure sensitive adhesive layer 52b, a third module pressure sensitive adhesive layer 52c located below the first touch sensor 56a, A fourth module pressure-sensitive adhesive layer 52d located below the second touch sensor 56b and a fourth module pressure-sensitive adhesive layer 52d located below the fourth module pressure-sensitive adhesive layer 52c, A third glass substrate 51c positioned on the third glass substrate 51c, Is configured by a backlight 57, which is located on the lower side of the plate a second polarizing plate (53b), and a second polarizing plate (53b) positioned at the lower side of (51c).

The manufacturing of the touch panel 1C according to the present embodiment can basically be performed in the same manner as the touch panel 1A according to the first embodiment.

[Fourth Embodiment]

In the touch panel 1C according to the third embodiment described above, the light diffusion layer 30 is provided at a position adjacent to the display module 5, but the present invention is not limited to this, and the writing feeling improving layer 10 and the display body module 5, as shown in Fig.

For example, the light diffusion layer 30 may be provided between the base film 21 and the cover material 23 like the touch panel 1D according to the fourth embodiment shown in Fig. In this case, in the touch panel 1C according to the third embodiment, the pressure sensitive adhesive layer 22 is replaced with the light diffusion layer 30, and the light diffusion layer 30 is replaced with the pressure sensitive adhesive layer 22. The pressure-sensitive adhesive layer 22 can have the same structure as the pressure-sensitive adhesive layer 22 of the touch panel 1C according to the third embodiment.

The manufacturing of the touch panel 1D according to the present embodiment can basically be performed similarly to the touch panel 1B according to the second embodiment.

[Fifth Embodiment]

In the touch panels 1A to 1D according to the first to fourth embodiments described above, only one cover material 23 exists, but in order to adjust the distance between the light diffusion layer 30 and the color filter 54 Or a plurality of cover materials (and pressure-sensitive adhesive layers) may be provided in order to control the total haze from the writing feeling improving layer 10 to the light diffusing layer 30. For example, like the fifth touch panel 1E shown in Fig. 5, two cover materials and two pressure-sensitive adhesive layers may be provided. Specifically, the fifth touch panel 1E is located on the side (lower side in FIG. 5) where the touch pen of the writing feeling improving layer 10 does not contact with the writing feeling improving layer 10, and the writing feeling improving layer 10 A light diffusing layer 30 which is located below the base film 21 and which has adhesiveness and a second light diffusion layer 30 which is located below the first base film 21 with the light diffusion layer 30 interposed therebetween, A cover material 23a, a first pressure sensitive adhesive layer 22a located below the first cover material 23a, a second cover material 23b located below the first pressure sensitive adhesive layer 22a, A display module module 22 having a position detecting function in which a second pressure sensitive adhesive layer 22b positioned below the second cover material 23b and a second cover material 23b bonded to the second pressure sensitive adhesive layer 22b through the second pressure sensitive adhesive layer 22b 5). The first cover member 23a may have a stepped portion such as a printed layer like the cover member 23 described above. On the other hand, the cover material (the second cover material 23b in this embodiment) other than the first cover material 23a usually has no step difference due to the printing layer or the like. The fifth touch panel 1E is a modified example based on the fourth touch panel 1D, but is not limited thereto.

The position of the light diffusion layer 30 in the touch panel is not limited to the position in the touch panel 1E according to the fifth embodiment. For example, the first pressure sensitive adhesive layer 22a or the second pressure sensitive adhesive layer 22b in the touch panel 1E according to the fifth embodiment is replaced with the light diffusion layer 30, 1 pressure-sensitive adhesive layer 22a or the second pressure-sensitive adhesive layer 22b.

The number of the cover material and the pressure-sensitive adhesive layer is preferably set such that the distance between the light diffusion layer 30 and the color filter 54 and the total haze from the writing feeling improving layer 10 to the light diffusion layer 30 are within a predetermined range, It is not limited. For example, three cover materials and three pressure-sensitive adhesive layers may be provided as in a sixth touch panel 1F shown in Fig. 6, which will be described later.

The embodiments described above are described for the purpose of facilitating understanding of the present invention and are not described for limiting the present invention. Therefore, each element disclosed in the above embodiment is intended to include all design modifications and equivalents falling within the technical scope of the present invention.

For example, when the surface of the base film 21 satisfies the above-mentioned handwriting property, the writing feeling improving layer 10 as a coat layer is not necessarily required. In this case, the base film 21 itself may improve the writing feeling Layer.

(Example)

Hereinafter, the present invention will be described in more detail with reference to Examples and the like, but the scope of the present invention is not limited to these Examples and the like.

[Example 1]

(1) Formation of writing feeling improving layer

, 100 parts by mass of an organic-inorganic hybrid resin (Arakawa Chemical Industries, Ltd., product name " Offstar Z7530 ") as a curable component (solid content conversion value is shown below) 10 parts by mass of crosslinked polymethyl methacrylate fine particles and 5 parts by mass of 1-hydroxycyclohexyl phenyl ketone as a photopolymerization initiator were mixed to obtain a coating composition. The coating composition was diluted with propylene glycol monomethyl ether to prepare a coating liquid.

The coating liquid obtained as described above was coated on the side of the adhesive layer side of this polyester film with adhesive layer (Toyobo Co., Ltd., product name "Cosmo Shine A4300", thickness: 125 μm) as a base film with a wire bar # 14, Lt; / RTI > for 1 minute. Next, ultraviolet rays were irradiated under the following conditions by an ultraviolet ray irradiator (product name: "Nitrogen purge small conveyor type UV irradiator CSN2-40") under the atmosphere to form a 5 μm thick writing feeling improving layer Thus, a layered product comprising a writing feeling improving layer and a base film was obtained.

[UV irradiation condition]

· Light source: High pressure mercury lamp

· Lamp power: 1.4kW

· Conveyor speed: 1.2m / min

· Illumination: 100 mW / ㎠

Light quantity: 240 mJ / cm 2

As to the thickness of the writing feeling improving layer, the total thickness of the layered product was measured using a static pressure gauge (trade name: " PG-01J ") and the total thickness of the obtained layered product, Was calculated as the thickness of the writing feeling improving layer.

(2) Formation of light diffusion layer

60 parts by mass of n-butyl acrylate, 20 parts by mass of methyl acrylate and 20 parts by mass of 2-hydroxyethyl acrylate were copolymerized by a solution polymerization method to prepare an acrylic acid ester copolymer. The molecular weight of this acrylic acid ester copolymer was measured by the following method, and the weight average molecular weight (Mw) was 50,000.

The weight average molecular weight (Mw) is a weight average molecular weight in terms of polystyrene measured by gel permeation chromatography (GPC) under the following conditions (GPC measurement).

<Measurement Conditions>

GPC measurement apparatus: Tosoh Co., Ltd., HLC-8020

· GPC column (pass in the following order): Dososaje

  TSK guard column HXL-H

  TSK gel GMHXL (× 2)

  TSK gel G2000HXL

Measurement solvent: tetrahydrofuran

· Measuring temperature: 40 ℃

100 parts by mass of the acrylic ester copolymer obtained in the above step and 0.25 parts by mass of trimethylolpropane-modified tolylene diisocyanate (Toyo Chemicals Co., Ltd., product name "BHS-8515") as cross- (Momentive Performance Materials Japan Co., Ltd., product name: TOSHAL 120) were mixed and diluted with ethyl acetate to prepare a pressure-sensitive adhesive composition To obtain a coating liquid.

The coating solution of the sticky composition obtained above was applied to a release treatment surface of a release sheet (LINTEC SHAETE, SP-PET3811, thickness: 38 mu m) having one surface of a polyethylene terephthalate film peeled off with a silicone-based release agent by a knife coater, Followed by heat treatment at 90 占 폚 for 1 minute to form a light diffusion layer having a thickness of 10 占 퐉 to obtain a light diffusion sheet.

As for the thickness of the light-diffusing layer, the total thickness of the light-diffusing layer sheet was measured by using a static pressure gauge (trade name: &quot; PG-01J &quot;) And the thickness was calculated as the thickness of the light diffusion layer.

(3) Formation of a pressure-sensitive adhesive layer

100 parts by mass of the acrylic acid ester copolymer used in the light diffusion layer and 0.25 parts by mass of trimethylolpropane-modified tolylene diisocyanate (Toyo Chemicals Co., Ltd., product name "BHS-8515") as a crosslinking agent were mixed and diluted with ethyl acetate, Was obtained.

The coating solution of the sticky composition obtained above was applied to a release treatment surface of a release sheet (LINTEC SHAETE, SP-PET3811, thickness: 38 mu m) having one side of the polyethylene terephthalate film peeled off with a silicone-based release agent using a knife coater, Followed by heat treatment at 90 占 폚 for 1 minute to form a pressure-sensitive adhesive layer having a thickness of 100 占 퐉 to obtain a pressure-sensitive adhesive sheet.

The total thickness of the pressure-sensitive adhesive sheet was measured using a static pressure gauge (trade name: &quot; PG-01J &quot;) and the total thickness of the pressure- Was calculated as the thickness of the pressure-sensitive adhesive layer.

(4) Lamination of each member

As shown below, the respective members were laminated to manufacture a touch panel having the constitution (configuration 1E) shown in Fig. The lamination of the respective members was performed manually using a compression roller (2 kg, material of the sample contact portion: rubber).

(a) Firstly, a base film in a laminate composed of a writing feeling improving layer and a base film and a light diffusion layer of a light diffusion layer sheet were laminated.

(b) Next, the release sheet of the light-diffusing layer sheet was peeled off from the light-diffusing layer, and the exposed light-diffusing layer and the first cover material (made by Corning Incorporated, product name "Eagle XG", thickness 700 μm) were laminated.

(c) Next, the first cover material and the pressure-sensitive adhesive layer (thickness: 100 m) of the pressure-sensitive adhesive sheet were laminated. This pressure-sensitive adhesive layer corresponds to the first pressure-sensitive adhesive layer 22a in Fig.

(d) Next, the release sheet of the pressure-sensitive adhesive sheet is peeled off from the pressure-sensitive adhesive layer (first pressure-sensitive adhesive layer 22a), and the exposed pressure-sensitive adhesive layer (first pressure-sensitive adhesive layer 22a) Product name: Eagle XG, thickness: 1100 탆).

(e) Next, the second cover material and the pressure-sensitive adhesive layer (thickness: 100 m) of the pressure-sensitive adhesive sheet were laminated. This pressure-sensitive adhesive layer corresponds to the second pressure-sensitive adhesive layer 22b in Fig.

(f) Finally, the peeling sheet of the pressure-sensitive adhesive sheet is peeled from the pressure-sensitive adhesive layer (second pressure-sensitive adhesive layer 22b), and the exposed pressure-sensitive adhesive layer (second pressure-sensitive adhesive layer 22b) (Resolution: 264 ppi) having a distance of 1 mm was laminated to obtain a touch panel having the constitution (constitution 1E) shown in Fig. 5.

[Example 2]

The composition and the thickness of the writing feeling improving layer and the light diffusion layer were changed as shown in Table 1 and the thickness of the first cover material was changed to 1100 占 퐉 and the thickness of the pressure sensitive adhesive layer corresponding to the first pressure sensitive adhesive layer 22a And the thickness of the pressure-sensitive adhesive layer corresponding to the second pressure-sensitive adhesive layer (22b) were changed to 400 mu m, respectively.

[Examples 3 and 4]

A touch panel was fabricated in the same manner as in Example 1 except that the materials, mixing ratio, and thickness of the writing feeling improving layer and the light diffusion layer were changed as shown in Table 1. [

[Example 5]

The composition and the thickness of the writing feeling improving layer and the light diffusion layer were changed as shown in Table 1 and the structure of the touch panel was changed to the composition (configuration 1D) shown in Fig. 4, and the thickness of the pressure- A touch panel was fabricated in the same manner as in Example 1 except that the touch panel was changed. The touch panel having the structure shown in Fig. 4 was manufactured as follows.

(a) Firstly, a base film in a laminate composed of a writing feeling improving layer and a base film and a light diffusion layer of a light diffusion layer sheet were laminated.

(b) Next, the release sheet of the light-diffusing layer sheet was peeled from the light-diffusing layer, and the exposed light-diffusing layer and the cover material (product name "Eagle XG", thickness 700 μm) were laminated.

(c) Next, the cover material and the pressure-sensitive adhesive layer (thickness: 300 m) of the pressure-sensitive adhesive sheet were laminated.

(d) Finally, the peeling sheet of the pressure-sensitive adhesive sheet was peeled off from the pressure-sensitive adhesive layer, and a display module (resolution: 264 ppi) having a distance of 1 mm from the exposed pressure-sensitive adhesive layer to the surface of the display module was laminated , A touch panel having the structure (configuration 1D) shown in Fig. 4 was obtained.

[Example 6]

A touch panel was produced in the same manner as in Example 5 except that the materials, blending ratio and thickness of the writing feeling improving layer and the light diffusion layer were changed as shown in Table 1. [

[Comparative Example 1]

A touch panel was fabricated in the same manner as in Example 1 except that the materials, mixing ratio, and thickness of the writing feeling improving layer and the light diffusion layer were changed as shown in Table 1. [

[Comparative Example 2]

A touch panel was produced in the same manner as in Example 5 except that the materials, blending ratio and thickness of the writing feeling improving layer and the light diffusion layer were changed as shown in Table 1. [

[Comparative Example 3]

The composition and the thickness of the writing feeling improving layer and the light diffusion layer were changed as shown in Table 1 and the configuration of the touch panel was changed to the configuration (configuration 1F) shown in Fig. 6, and the thickness of the first cover material was changed to 1100 m , And the thickness of the pressure-sensitive adhesive layer was changed to 300 mu m and 200 mu m.

The touch panel 1F shown in Fig. 6 is disposed on the side (the lower side in Fig. 6) on which the writing feeling improving layer 10 is not in contact with the touch pen of the writing feeling improving layer 10 and the writing feeling improving layer A light diffusing layer 30 which is located below the base film 21 and has adhesive property and a base film 21 on which the base film 21 is bonded via the light diffusion layer 30, 1 cover material 23a (thickness: 1100 占 퐉), a first pressure-sensitive adhesive layer 22a (thickness: 300 占 퐉) located under the first cover material 23a, A second pressure sensitive adhesive layer 22b (thickness: 200 占 퐉) located under the second cover material 23b and a second pressure sensitive adhesive layer 22b (thickness: A third pressure sensitive adhesive layer 22c (thickness: 200 占 퐉) located under the third cover material 23c and a third pressure sensitive adhesive layer 22c 3 pressure-sensitive adhesive layer 22c and a third cover material 23c is bonded to the third cover material 23c via the third pressure- Is constituted by a body provided with a module (5).

The touch panel 1F having the structure shown in Fig. 6 was manufactured as follows.

(a) Firstly, a base film in a laminate composed of a writing feeling improving layer and a base film and a light diffusion layer of a light diffusion layer sheet were laminated.

(b) Next, the release sheet of the light-diffusing layer sheet was peeled off from the light-diffusing layer, and the exposed light-diffusing layer and the first cover material (made by Corning Incorporated, product name "Eagle XG", thickness 1100 μm) were laminated.

(c) Next, the first cover material and the pressure-sensitive adhesive layer (thickness: 300 m) of the pressure-sensitive adhesive sheet were laminated. This pressure-sensitive adhesive layer corresponds to the first pressure-sensitive adhesive layer 22a in Fig.

(d) Next, the release sheet of the pressure-sensitive adhesive sheet is peeled off from the pressure-sensitive adhesive layer (first pressure-sensitive adhesive layer 22a), and the exposed pressure-sensitive adhesive layer (first pressure-sensitive adhesive layer 22a) Product name: Eagle XG, thickness: 1100 탆).

(e) Next, the second cover material and the pressure-sensitive adhesive layer (thickness: 200 m) of the pressure-sensitive adhesive sheet were laminated. This pressure-sensitive adhesive layer corresponds to the second pressure-sensitive adhesive layer 22b in Fig.

(f) Next, the release sheet of the pressure-sensitive adhesive sheet is peeled off from the pressure-sensitive adhesive layer (second pressure-sensitive adhesive layer 22b), and the exposed pressure-sensitive adhesive layer (second pressure-sensitive adhesive layer 22b) Product name: Eagle XG, thickness: 1100 탆).

(g) Next, the third cover material and the pressure-sensitive adhesive layer (thickness: 200 m) of the pressure-sensitive adhesive sheet were laminated. This pressure-sensitive adhesive layer corresponds to the third pressure-sensitive adhesive layer 22c in Fig.

(h) Finally, the peeling sheet of the pressure-sensitive adhesive sheet is peeled from the pressure-sensitive adhesive layer (third pressure-sensitive adhesive layer 22c), and the exposed pressure-sensitive adhesive layer (the third pressure-sensitive adhesive layer 22c) (Resolution: 264 ppi) was laminated to obtain a touch panel having the structure (configuration 1F) shown in Fig. 6.

[Comparative Example 4]

Except that the light-diffusing layer used in Example 1 was changed to the pressure-sensitive adhesive layer (thickness 10 mu m) used in Example 1, and the structure of the touch panel was changed to the structure (composition 1G) shown in Fig. 7 To produce a touch panel.

The touch panel 1G shown in Fig. 7 is disposed on the side (the lower side in Fig. 7) on which the writing feeling improving layer 10 is not in contact with the touch pen of the writing feeling improving layer 10 and the writing feeling improving layer A first pressure-sensitive adhesive layer 22a (thickness: 10 占 퐉) located on the lower side of the base film 21 and a first pressure-sensitive adhesive layer 22b A second pressure sensitive adhesive layer 22b (thickness: 100 占 퐉) located below the first cover material 23a and a second pressure sensitive adhesive layer 22b A third pressure sensitive adhesive layer 22c (thickness: 100 占 퐉) located below the second cover material 23b and a second cover material 23b via the third pressure sensitive adhesive layer 22c And a display body module 5 having a position detection function, which are combined with each other.

The touch panel 1G having the structure shown in Fig. 7 was manufactured as follows.

(a) First, a base film in a laminate composed of a writing feeling improving layer and a base film and a pressure-sensitive adhesive layer (thickness 10 占 퐉) of a pressure-sensitive adhesive sheet were laminated. This pressure-sensitive adhesive layer corresponds to the first pressure-sensitive adhesive layer 22a in Fig.

(b) Next, the release sheet of the pressure-sensitive adhesive sheet is peeled off from the pressure-sensitive adhesive layer (first pressure-sensitive adhesive layer 22a), and the exposed pressure-sensitive adhesive layer (first pressure-sensitive adhesive layer 22a) Product name &quot; Eagle XG &quot;, thickness 700 mu m).

(c) Next, the first cover material and the pressure-sensitive adhesive layer (thickness: 100 m) of the pressure-sensitive adhesive sheet were laminated. This pressure-sensitive adhesive layer corresponds to the second pressure-sensitive adhesive layer 22b in Fig.

(d) Next, the release sheet of the pressure-sensitive adhesive sheet is peeled from the pressure-sensitive adhesive layer (second pressure-sensitive adhesive layer 22b), and the exposed pressure-sensitive adhesive layer (second pressure-sensitive adhesive layer 22b) Product name: Eagle XG, thickness: 1100 탆).

(e) Next, the second cover material and the pressure-sensitive adhesive layer (thickness: 100 m) of the pressure-sensitive adhesive sheet were laminated. This pressure-sensitive adhesive layer corresponds to the third pressure-sensitive adhesive layer 22c in Fig.

(f) Finally, the release sheet of the pressure-sensitive adhesive sheet is peeled off from the pressure-sensitive adhesive layer (third pressure-sensitive adhesive layer 22c), and the exposed pressure-sensitive adhesive layer (third pressure-sensitive adhesive layer 22c) (Resolution: 264 ppi) having a distance of 1 mm was laminated to obtain a touch panel having the constitution (configuration 1G) shown in Fig.

[Referential Example 1]

A touch panel was fabricated in the same manner as in Example 1 except that the materials, mixing ratio, and thickness of the writing feeling improving layer and the light diffusion layer were changed as shown in Table 1. [

Details of the abbreviations and the like in Table 1 are as follows.

A: Organic-inorganic hybrid resin (Arakawa Chemical Industries, Ltd., product name &quot; OffStar Z7530 &quot;)

B: polyfunctional urethane acrylate (product name: "Beam set 575CB" manufactured by Arakawa Chemical Industries, Ltd.)

C: Pure-phase crosslinked polymethyl methacrylate fine particles (CV value: 32%) having an average particle diameter of 3 占 퐉

D: Amorphous silica fine particles (CV value: 35%) having an average particle diameter of 4.5 탆

E: Amorphous silica fine particles having an average particle diameter of 1.5 탆 (CV value: 88%)

F: Conjugate-type crosslinked polymethyl methacrylate fine particles having an average particle diameter of 1.5 탆 (CV value: 23%)

G: 1-hydroxycyclohexyl phenyl ketone (photopolymerization initiator)

H: An acrylic ester copolymer (Mw: 500,000) obtained by copolymerizing 60 parts by mass of n-butyl acrylate, 20 parts by mass of methyl acrylate and 20 parts by mass of 2-hydroxyethyl acrylate by solution polymerization,

I: Condensation silicone fine particles having an average particle diameter of 2.0 占 퐉 (microparticles made of a silicon-containing compound having an intermediate structure of inorganic and organic) (Momentive Performance Materials Japan Co., Ltd., product name: TOSHAL 120)

J: Microcrystalline polymethyl methacrylate-polystyrene copolymer particles having an average particle diameter of 3.5 占 퐉

K: Trimethylolpropane-modified tolylene diisocyanate (trade name: BHS-8515) (Crosslinking agent)

[Test Example 1] (Calculation of the distance between the light diffusion layer and the color filter)

In the touch panel manufactured in Examples and Comparative Examples, the distance between the light diffusion layer and the color filter was calculated. As described above, in the display module (resolution: 264 ppi) used in Examples and Comparative Examples, the distance from the color filter to the surface of the display module (surface to which the pressure-sensitive adhesive layer was pasted) was 1 mm. The results are shown in Table 2.

[Test Example 2] (Measurement of haze value)

The haze (%) and the internal haze (%) from the writing feeling improving layer to the light diffusion layer in a touch panel manufactured in Examples and Comparative Examples were measured with a haze meter (product name: "NDH2000" manufactured by Nippon Denshoku Chemical Co., Ltd.) And measured according to JIS K7105. The results are shown in Table 2.

Specifically, the haze of the layered product of the writing feeling improving layer, the base film, the light diffusing layer (the pressure-sensitive adhesive layer in Comparative Example 4) and the release sheet obtained during the production in Examples and Comparative Examples was measured, By calculating the haze, we calculated the total haze.

Further, the pressure-sensitive adhesive sheet (pressure-sensitive adhesive layer + release sheet) used in Examples and Comparative Examples was pasted on the writing feeling improving layer of the laminate, and the haze including the pressure-sensitive adhesive sheet was measured. Then, the internal haze was calculated from the haze by subtracting the haze of the pressure-sensitive adhesive sheet and the haze of the release sheet.

[Test Example 3] (Pen sliding test)

The touch panels prepared in Examples and Comparative Examples were placed on a glass substrate with the writing feeling improving layer side up. A pen tip of a hard felt-tipped touch pen (Wako Musashine, product name &quot; ACK-2003 &quot;) having a pen tip diameter of 0.5 mm was pressed against the surface of the writing feeling improving layer in a vertical direction In a direction perpendicular to the surface of the layer), while moving at a speed of 100 mm / min in any one direction parallel to the surface of the writing feeling improving layer. The touch pen was attached to a carriage dedicated for measurement, and the touch pen was moved on the writing feeling improving layer by moving the carriage.

A chart of the moving distance (mm) - the nib resistance (mN) was obtained by measuring the nib resistance of the nib when moving using a universal tester (Orientech Co., Ltd., product name: Tensilon). Then, a chart of the obtained moving distance (mm) - nib resistance (mN) was Fourier transformed by software (product name "Excel" manufactured by Microsoft Corporation) to obtain a frequency (Hz) -amplitude (-) chart. The average value, maximum value (maximum amplitude value) and peak number (number of amplitudes) of the amplitudes in the frequency range of 1 to 2 Hz were obtained from the frequency (Hz) -amplitude (-) chart. The results are shown in Table 2.

[Test Example 4] (Sensory evaluation of writing feeling)

The touch panels prepared in Examples and Comparative Examples were placed on a glass substrate with the writing feeling improving layer side up. On the surface of the writing feeling improving layer, a pen tip of a hard felt-tipped touch pen (Wako Musashine, product name "ACK-2003") having a pen tip diameter of 0.5 mm was contacted and slid to evaluate the writing feeling.

In the evaluation, a pencil (Mitsubishi Enfittushuze, product name "Mitsubishi Pencil Uni B") was applied to a 5-ply paper (Kokuyo S & T Shuze, product name " And the one that fell out of the writing feeling was determined to be defective. In addition, evaluation was carried out by three panelists, and ◎ was given to all three persons who felt good, and ○, which felt that one person or two were good, and X, which all three persons felt to be bad. The results are shown in Table 2.

[Test Example 5] (Evaluation of glare)

(RGB values (R, G, B) = 0, 128, 0) of the display module (tablet terminal) in the touch panel manufactured in the examples and the comparative example were measured To evaluate the glare. The results are shown in Table 2.

◎: No glare confirmed

○: A little glare was confirmed, but it was glare which was practically insignificant

X: Glare was confirmed

[Test 6] (Evaluation of display image visibility)

(RGB values (R, G, B) = 0, 128, 0) of the display module (tablet terminal) in the touch panel manufactured in the examples and the comparative example were measured To evaluate the visibility of the display image. The results are shown in Table 2.

A: No decrease in visibility of the display image was confirmed.

?: A decrease in visibility of the displayed image (fading of color, blur of image, etc.) was confirmed a little (practically no problem)

X: Decrease in visibility of the displayed image (color fade, blurred image, etc.) was confirmed

[Table 1]

[Table 2]

As is clear from Table 2, the touch panel manufactured in the examples has a reduced glare, a good visibility of the display image, and a good writing feeling by the touch pen.

The image display device having a position detection function according to the present invention is a touch panel having excellent writing feeling and visibility.

1A, 1B, 1C, 1D, 1E, 1F, 1G: Touch panel (image display device with position detection function)
10: writing feeling improving layer 21: substrate film
22: pressure-sensitive adhesive layer 22a: first pressure-sensitive adhesive layer
22b: second pressure-sensitive adhesive layer 22c: third pressure-sensitive adhesive layer
22d: fourth pressure-sensitive adhesive layer 23: cover material
23a: first cover member 23b: second cover member
23c: third cover member 24a: first touch sensor
24b: second touch sensor 30: light diffusion layer
4, 5: display body modules 41a, 51a: first glass substrate
41b, 51b: second glass substrate 41c, 51c: third glass substrate
42: Module pressure-sensitive adhesive layer 52a: First module pressure-sensitive adhesive layer
52b: second module pressure-sensitive adhesive layer 52c: third module pressure-sensitive adhesive layer
52d: fourth module pressure-sensitive adhesive layer 43a, 53a: first polarizer plate
43b, 53b: second polarizing plate 44, 54: color filter
45, 55: liquid crystal layer 56a: first touch sensor
56b: second touch sensor 47, 57: backlight

Claims (7)

At least a writing feeling improving layer in contact with the touch pen, a display body module having a color filter, and a light diffusion layer provided at an arbitrary position between the writing feeling improving layer and the display body module,
The total haze from the writing feeling improving layer to the light diffusion layer is 12% or more and 45% or less,
Wherein a distance between the light diffusion layer and the color filter is 4 mm or less
Wherein the image display device has a position detection function. The method according to claim 1,
Wherein the image display device with position detection function is provided with a base film,
Wherein the writing feeling improving layer is provided on one side of the base film
Wherein the image display device has a position detection function. The method according to claim 1,
A pen tip of a touch pen of a hard felt heart having a pen tip diameter of 0.5 mm is brought into contact with the surface of the writing feeling improving layer in contact with the touch pen in a vertical direction under a load of 3.92 N, In the range of frequency 1 to 2 Hz obtained from the frequency-amplitude chart obtained by Fourier transforming the obtained chart of the moving distance-to-nib resistance force obtained by measuring the nib resistance of the pen while moving it at a speed of 100 mm / Wherein the average value of the amplitudes is 1.0 or more and 10 or less and the peak number of the amplitudes is 4 or more and 30 or less. The method according to claim 1,
Wherein the writing sensitivity improving layer is a layer formed by curing a curable component and a coating composition containing fine particles. The method according to claim 1,
Wherein the light-diffusing layer is a layer formed of a sticky composition containing an adhesive component and light diffusion fine particles. The method according to claim 1,
Wherein the light diffusion layer is provided adjacent to the display unit module. 3. The method of claim 2,
Wherein the light diffusion layer is provided adjacent to the base film on which the writing feeling improving layer is provided.

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