TW201841097A - 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

   Image display device with position detection function   

The invention relates to an image display device with a position detection function that can use a stylus.

In recent years, among various electronic products, a large number of image display devices (touch panels) having a position detection function having both a display device and an input method have been used. In this type of touch panel, in addition to using a finger for input, a stylus can also be used for input. If a stylus is used, input can be performed with finer precision and finer than a finger. However, the display module of a touch panel is usually rigid. Therefore, the writing touch feeling using a stylus pen is different from the writing touch feeling when writing on paper using a pencil or a pen, and it is easy to be bad.

In order to solve the problem of writing touch using a stylus pen on a touch panel, a film for improving writing touch (hereinafter, sometimes referred to as a “writing touch improving film”) is researched on the touch panel. ). As such a film, for example, Patent Document 1 discloses a touch-sensitive film including: a transparent base film; and a linear convex portion having a mesh structure formed on at least one surface of the transparent base film and having a mesh structure. A plurality of blocks arranged regularly, and the linear protrusions occupy 5 to 80% of the area of the entire surface of the touch-sensitive membrane.

[Previous Technical Literature]

Patent literature

Patent Document 1: Japanese Patent Application Laid-Open No. 2015-054417

However, in the past, the writing touch-sensing enhancement film caused the image light of the touch panel to be scattered, a part of which flickered and dazzled, and the so-called "glare" occurred.

In view of this situation, an object of the present invention is to provide an image display device having a position detection function, which can not detract from the writing touch feeling using a stylus pen, suppress glare, and has good visibility of displayed images.

In order to achieve the above object, the first aspect of the present invention provides an image display device having a position detection function, which is characterized by at least: a writing touch enhancement layer contacted by a stylus pen; a display body module having a color filter film; And a light diffusion layer provided at any position between the writing touch-sensing enhancement layer and the display body module, the total haze from the writing touch-sensing enhancement layer to the light diffusion layer is 12% or more and 45% or less, The distance between the light diffusion layer and the color filter film is 4 mm or less (Invention 1). Herein, the "writing touch-enhancing layer" in this specification refers to a layer that improves the writing touch feeling when the writing touch feeling using the stylus pen is not provided. For example, When a stylus is directly used on a base film, a layer that enhances the writing touch.

In the above invention (Invention 1), by setting the total haze and the distance between the light diffusion layer and the color filter film as described above, glare can be suppressed and the visibility of a displayed image becomes good. In addition, the physical properties and structures described above do not detract from the writing touch of the stylus pen provided by the writing touch improving layer.

In the above-mentioned invention (Invention 1), the image display device having a position detection function is provided with a base film, and the writing touch improvement layer is preferably provided on a side of the base film side (Invention 2).

In the above inventions (Inventions 1, 2), the surface of the stylus of the writing touch-sensing enhancement layer is in contact with the stylus of the stylus pen with a diameter of 0.5 mm and the tip of the stylus is pressurized under a load of 3.92 N. , Contact it in a vertical direction, move it at a speed of 100 mm / min in any direction parallel to the surface of the writing touch-sensing layer, and measure the nib resistance, and perform Fourier analysis on the graph of the movement distance-nib resistance For conversion, the average value of the amplitude in the frequency range of 1 to 2 Hz obtained from the frequency-amplitude chart obtained from the conversion is preferably 1.0 or more and 10 or less, and the number of peaks of the amplitude is preferably 4 or more and 30 or less ( Invention 3).

In the above inventions (Inventions 1 to 3), it is preferable that the writing touch improving layer is a layer obtained by curing a coating composition containing a curable component and fine particles (Invention 4).

In the above inventions (Inventions 1 to 4), the light diffusion layer is preferably a layer formed of an adhesive composition containing an adhesive component and light diffusing fine particles (Invention 5).

In the above inventions (Inventions 1 to 5), the light diffusion layer is preferably provided adjacent to the display module (Invention 6).

In the said invention (invention 2), it is preferable that the said light-diffusion layer is provided so that it may be adjacent to the said base film provided with the said writing touch improvement layer (invention 7).

The image display device with position detection function related to the present invention does not damage the writing touch feeling using a stylus pen, suppresses glare, and has good visibility for displaying images.

1A, 1B, 1C, 1D, 1E, 1F, 1G ‧‧‧ image display device with position detection function

10‧‧‧ Writing Touch Enhancement Layer

21‧‧‧ substrate film

22‧‧‧ Adhesive layer

22a‧‧‧The first adhesive layer

22b‧‧‧Second adhesive layer

22c‧‧‧The third adhesive layer

22d‧‧‧The fourth adhesive layer

23‧‧‧ Covering material

23a‧‧‧The first covering material

23b‧‧‧ 2nd cover material

23c‧‧‧3rd cover material

24a‧‧‧1st touch sensor

24b‧‧‧ 2nd touch sensor

30‧‧‧light diffusion layer

4,5‧‧‧Display Module

41a, 51a‧‧‧1st glass substrate

41b, 51b‧‧‧ 2nd glass substrate

41c, 51c‧‧‧3rd glass substrate

42‧‧‧Module Adhesive Layer

52a‧‧‧The first module adhesive layer

52b‧‧‧Second module adhesive layer

52c‧‧‧The third module adhesive layer

52d‧‧‧4th module adhesive layer

43a, 53a‧‧‧1st polarizer

43b, 53b‧‧‧ 2nd polarizer

44,54‧‧‧Color filter

45,55‧‧‧LCD layer

56a‧‧‧1st touch sensor

56b‧‧‧ 2nd touch sensor

47,57‧‧‧Backlight

FIG. 1 is a cross-sectional view of an image display device having a position detection function according to a first embodiment of the present invention.

Fig. 2 is a sectional view of an image display device having a position detection function according to a second embodiment of the present invention.

Fig. 3 is a sectional view of an image display device having a position detection function according to a third embodiment of the present invention.

Fig. 4 is a sectional view of an image display device having a position detection function according to a fourth embodiment of the present invention.

Fig. 5 is a sectional view of an image display device having a position detection function according to a fifth embodiment of the present invention.

Fig. 6 is a sectional view of an image display device having a position detection function used in a comparative example.

Fig. 7 is a sectional view of an image display device having a position detection function used in a comparative example.

Hereinafter, embodiments of the present invention will be described.

An image display device (hereinafter, also referred to as a "touch panel") having a position detection function according to an embodiment of the present invention includes at least: a writing touch enhancement layer that a stylus contacts; a display with a color filter film A body module; and a light diffusion layer disposed at any position between the writing touch-sensing enhancement layer and the display body module. Examples are described below.

[First Embodiment]

As shown in FIG. 1, the touch panel 1A according to the first embodiment of the present invention is composed of the writing touch-sensing enhancement layer 10 contacted by the stylus; On the contact side (lower side in FIG. 1), the base film 21 of the writing touch improvement layer 10 is formed; the first adhesive layer 22 a for bonding the base film 21; and the first adhesive layer 22 a is interposed therebetween. The cover material 23 bonded to the base film 21 and the second adhesive layer 22b for bonding the cover material 23; the first touch sensor bonded to the cover material 23 through the second adhesive layer 22b. 24a; a third adhesive layer 22c for bonding the first touch sensor 24a; a second touch sensor 24b bonded to the first touch sensor 24a via the third adhesive layer 22c An adhesive light diffusion layer 30 for bonding the second touch sensor 24b; and a display module 4 bonded to the second touch sensor 24b through the light diffusion layer 30.

The display module 4 is not particularly limited as long as it has a color filter film. However, a liquid crystal (LCD) module, a light emitting diode (LED) module, and an organic electroluminescent light (organic EL) modules, etc. FIG. 1 illustrates a liquid crystal module as an example. In this embodiment, the display body module 4 is composed of a first glass substrate 41a adjacent to the light diffusion layer 30, a module adhesive layer 42 located below the first glass substrate 41a, and a module adhesive. The first polarizing plate 43a on the lower side of the layer 42; the second glass substrate 41b on the lower side of the first polarizing plate 43a; the color filter film 44 on the lower side of the second glass substrate 41b; A liquid crystal layer 45; a third glass substrate 41c positioned below the liquid crystal layer 45; a second polarizing plate 43b positioned below the third glass substrate 41c; and a backlight 47 positioned below the second polarizing plate 43b.

Physical property

In the touch panel 1A according to this embodiment, the total haze from the writing-touch-improving layer 10 to the light diffusion layer 30 is 12% or more and 45% or less. With the above total haze being 12% or more, glare in a touch panel can be suppressed. In addition, when the total haze is 45% or less, fading or blurring of a displayed image can be suppressed, and good visibility of the displayed image can be maintained. In addition, in the touch panel 1A according to this embodiment, the total haze from the writing-touch-enhancing layer 10 to the light diffusion layer 30 is the writing-touch-enhancing layer 10, the substrate film 21, and the first adhesive layer 22a. , The haze of the entire laminated body of the covering material 23, the second adhesive layer 22b, the first touch sensor 24a, the third adhesive layer 22c, the second touch sensor 24b, and the light diffusion layer 30 ( Total internal and external haze). In addition, the haze in this specification is a value measured based on JIS K7136: 2000.

From the viewpoint of suppressing glare, the total haze is preferably 14% or more, particularly 16% or more, and further preferably 18% or more. In addition, from the viewpoint of ease of displaying a video, the total haze is preferably 42% or less, particularly 40% or less, and more preferably 38% or less.

In the touch panel 1A according to this embodiment, the distance between the light diffusion layer 30 and the color filter film 44 is 4 mm or less. The distance between the light diffusion layer 30 and the color filter film 44 is the distance between the surface on the color filter film 44 side of the light diffusion layer 30 and the surface on the light diffusion layer 30 side of the color filter film 44. If the distance is more than 4 mm, the display image is discolored or blurred, and the visibility of the display image is reduced. That is, when the distance is 4 mm or less, the visibility of a displayed image can be maintained well.

From the standpoint of ease of displaying a video, the distance is preferably 3 mm or less. On the other hand, the lower limit value of the distance is not particularly limited, but it is usually 0.005 mm or more, and preferably 0.01 mm or more.

In addition, the physical properties related to the total haze and the structures related to the distance between the light diffusion layer 30 and the color filter film 44 do not impair the writing touch of the stylus provided by the writing touch improving layer 10.

In addition, in the touch panel 1A related to this embodiment, the surface of the stylus of the stylus pen core with a tip diameter of 0.5 mm is applied to the surface of the stylus of the writing touch-sensing enhancement layer 10 to a load of 3.92 N. The pressure condition is to make it contact in the vertical direction, and move it at a speed of 100 mm / minute in any direction parallel to the surface of the writing touch improvement layer 10 and measure the pen tip resistance (mN). The obtained moving distance (mm ) -Fourier transform of the nib resistance (mN) graph, the frequency (Hz) obtained from the conversion-amplitude graph (a), the average value of the amplitude in the frequency range of 1 to 2 Hz is 1.0 or more and 10 or less Preferably, the number of peaks of the amplitude (the number of amplitudes) is preferably 4 or more and 30 or less (based on the physical properties of the pen slip test, hereinafter sometimes referred to as "writing touch physical properties"). The Fourier conversion is performed using software (manufactured by Microsoft, software name "Excel"). By setting the average value of the amplitude and the number of amplitudes to the ranges described above, it is possible to impart a better sense of resistance and friction to a writing touch using a stylus. In combination with these feelings, the writing touch of the stylus pen becomes similar to the feeling when writing on paper with a pencil, and thus becomes smooth and smooth.

The formulation of the amplitude in the frequency range of 1 to 2 Hz is based on experience found by the inventors that the vibration when reading is a superposition of a plurality of types of vibrations with various frequencies, especially as a "writing touch" Identifiable characteristic vibrations are vibrations in the frequency range of 1 to 2 Hz.

In addition, as the stylus pen, for example, a stylus pen with a diameter of 0.1 to 5 mm and a stylus pen tip with a diameter of 0.1 to 5 mm can also be used, such as a polyacetal pen pen. The pen can get the above effects.

Here, the "pen tip resistance" refers to the resistance associated with the pen tip when the stylus is moved under the above conditions. The "peak number" refers to the number of peaks with an amplitude of 1.5 or more in the frequency range of 1 to 2 Hz.

From the viewpoint of writing touch using a stylus, the average value of the amplitude is particularly preferably 1.5 or more. The average value of the amplitude is particularly preferably 4 or less. The amplitude number is preferably 5 or more, particularly 6 or more, and further preferably 8 or more. The amplitude number is particularly preferably 20 or less, and more preferably 15 or less.

From the viewpoint of further improving the writing touch using a stylus, the maximum value of the amplitude (maximum amplitude value) 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, and more preferably 5 or less.

A specific method for obtaining the graph of the movement distance (mm) -tip resistance (mN) is shown in the following test example.

2. Each component

(1) Writing touch improvement layer

In the present embodiment, the writing-touch-enhancing layer 10 is a layer that improves the writing touch of the stylus compared to when the stylus is used directly on the base film 21. It is preferable that the writing touch improvement layer 10 is a coating layer formed of a coating composition on the surface side of the base film 21 side, but it is not limited to these.

(1-1) Materials for writing touch-sensing layer

Compared with the case where the stylus is used directly on the substrate film 21, the writing tactile enhancement layer 10 of the touch panel 1A related to this embodiment can improve the writing tactile feel, and as long as it has good optical characteristics It may be formed of any material, but it is preferably formed of a material that satisfies the physical properties of writing. In this embodiment, it is preferable that the writing touch improvement layer 10 is formed by curing the coating composition C described below. When the coating composition C is used, the writing touch physical properties can be satisfied, and the writing touch improving layer 10 can be easily formed.

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

(1-1-1) hardening 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 and a thermosetting component. In the present embodiment, it is preferable to use an active energy ray-curable component from the viewpoints of the hardness of the formed writing touch-improving layer 10 and the heat resistance of the base film 21.

The active energy ray-curable component is preferably one that can be hardened by irradiation with active energy rays and exhibits a predetermined hardness, and that the relationship with fine particles can achieve the physical properties of writing touch.

Specific examples of the active energy ray-curable component include polyfunctional (meth) acrylate-based monomers, (meth) acrylate-based prepolymers, and active energy ray-curable polymers. Among them, polyfunctional (meth) A meth) acrylate-based monomer and / or a (meth) acrylate-based prepolymer are preferred, and a polyfunctional (meth) acrylate-based monomer is more preferred. The polyfunctional (meth) acrylate-based monomer and the (meth) acrylate-based prepolymer may be used individually or in combination. In addition, in this specification, a (meth) acrylate means both an acrylate and a methacrylate. The same applies to other similar terms.

Examples of the polyfunctional (meth) acrylate-based monomer include 1,4-butanediol di (meth) acrylate, 1,6-hexanediol di (meth) acrylate, and neopentyl Diethylene glycol di (meth) acrylate, polyethylene glycol di (meth) acrylate, hydroxytrimethylacetic acid neopentyl glycol di (meth) acrylate, dicyclopentyl di (meth) acrylic acid Ester, caprolactone modified dicyclopentenyl di (meth) acrylate, ethylene oxide modified di (meth) acrylate phosphate, allyl cyclohexyl di (meth) acrylate, Isocyanurate di (meth) acrylate, trimethylolpropane tri (meth) acrylate, dipentaerythritol tri (meth) acrylate, propionic acid modified dipentaerythritol tri (meth) acrylate, Pentaerythritol tri (meth) acrylate, propylene oxide modified trimethylolpropane tri (meth) acrylate, ginseng (propenyloxyethyl) isocyanurate, propionic acid modified dipentaerythritol penta (methyl) Acrylate), dipentaerythritol hexa (meth) acrylate, ethylene oxide modified dipentaerythritol hexa (meth) acrylate, caprolactone modified dipentaerythritol hexa (meth) propylene Esters of polyfunctional (meth) acrylate. These can be used alone or in combination of two or more.

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

As the polyester acrylate prepolymer, for example, the hydroxyl groups of a polyester oligomer having hydroxyl groups at both ends obtained by the condensation of a polycarboxylic acid and a polyhydric alcohol can be esterified with (meth) acrylic acid, Alternatively, it can be obtained by esterifying a hydroxyl group at the terminal of an oligomer obtained by adding an alkylene oxide to a polycarboxylic acid with (meth) acrylic acid.

The epoxy acrylate-based prepolymer can be reacted with (meth) acrylic acid by, for example, a relatively low molecular weight bisphenol-type epoxy resin or a phenol-type epoxy resin such as an oxirane ring. And obtained by esterification.

The urethane acrylate-based prepolymer may be, for example, a urethane oligomer obtained by reacting a polyether polyol, a polyester polyol, or the like with a polyisocyanate, and a (meth) acrylic acid may be used. Obtained by esterification.

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

These prepolymers may be used alone or in combination of two or more.

As the active energy ray-curable component, an organic-inorganic hybrid resin is preferably used. As the organic-inorganic hybrid resin, for example, a material obtained by bonding a silicon dioxide fine particle with a polymerizable unsaturated group-containing organic compound through a silane coupling agent or the like is preferable. In addition, 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 below.

When an organic-inorganic hybrid resin is used, it becomes easy to obtain the above-mentioned writing touch physical properties by the action of silica dioxide. Therefore, even if spherical organic fine particles are used as the fine particles described below, the physical properties of the writing touch can be easily obtained, whereby the optical characteristics of the formed writing touch improving layer 10 can be improved.

(1-1-2) fine particles

The fine particles may be either inorganic fine particles or organic fine particles. For example, from the viewpoint of imparting high surface hardness to the writing-touch-improving layer 10, inorganic fine particles are preferred, and from the viewpoint of further improving the optical characteristics of the writing-touch-improving layer 10, organic fine particles are preferred. The shape of the fine particles may be spherical or non-spherical. If it is aspheric, it may be indefinite, or it may have a shape with a high aspect ratio such as needles or scales. The "indefinite shape" referred to here means a shape that is not a regular shape such as a sphere or an ellipse, but has a plurality of irregular corners or faces. The fine particles may be used alone or in combination of two or more.

Examples of the inorganic fine particles include metals such as silicon dioxide, aluminum oxide, zirconia, titanium oxide, zinc oxide, germanium oxide, indium oxide, tin oxide, indium tin oxide (ITO), antimony oxide, and cerium oxide. Oxides; fine particles of metal fluorides such as magnesium fluoride and sodium fluoride. Among them, from the viewpoint of imparting high surface hardness and having little effect on optical characteristics, silicon dioxide and aluminum oxide are preferred, silicon dioxide is particularly preferred, and amorphous silicon dioxide is more preferred. In addition, 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 silicone fine particles, melamine resin fine particles, acrylic resin fine particles (for example, polymethyl methacrylate resin fine particles, etc.), acrylic-styrene copolymer fine particles, and polycarbonate. Fine particles, polyethylene fine particles, polystyrene fine particles, benzoguanamine fine resin particles, and the like. These resins can also be crosslinked. Among them, from the viewpoint of optical characteristics and hardness, acrylic resin particles are preferred, polymethyl methacrylate resin particles are particularly preferred, and spherical polymethyl methacrylate resin particles are more preferred. Fine spherical crosslinked polymethyl methacrylate resin particles are preferred.

In this embodiment, in order to obtain the physical properties of writing touch, it is preferable to use irregular fine particles having an average particle diameter of 0.5 μm or more and 15 μm or less, and spherical fine particles having an average particle diameter of 1.7 μm or more and 15 μm or less.

The average particle diameter of the amorphous fine particles is preferably 0.5 μm or more, particularly preferably 0.75 μm or more, and more preferably 1.0 μm or more. The average particle diameter of the amorphous fine particles is preferably 15 μm or less, more preferably 10 μm or less, particularly preferably 6 μm or less, and even more preferably 3 μm or less. When the average particle diameter of the amorphous fine particles is in the above range, the writing physical properties can be easily obtained. In addition, the average particle diameter of the fine particles in this specification is a value measured by a laser diffraction scattering particle size distribution measuring device.

The average particle diameter of the spherical fine particles is preferably 1.7 μm or more, particularly preferably 2.0 μm or more, and more preferably 2.5 μm 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 even more preferably 5 μm or less. When the average particle diameter of the spherical fine particles is in the above-mentioned range, the physical properties for writing can be easily obtained.

Regarding the particle size distribution of the fine particles, it is preferable that the coefficient of variation (CV value) of the particle size expressed by the following formula is 20% or more from the viewpoint of forming the writing touch physical property of the writing touch improvement layer 10, and particularly the 40% or more is preferable, and 70% or more is more preferable. From the same viewpoint, the CV value is preferably 200% or less, particularly preferably 175% or less, and more preferably 150% or less.

Coefficient of variation of particle size (CV value) (%) = (standard deviation particle size / average particle size) × 100

The coefficient of variation (CV value) of the particle size is a value measured by a laser diffraction scattering particle size distribution measuring device (manufactured by Horiba, Ltd., trade name "LA-920").

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, and further preferably 7% by mass or more. In addition, the content of the amorphous fine particles is preferably 40% by mass or less, more preferably 35% by mass or less, particularly preferably 30% by mass or less, and further preferably 20% by mass or less. When the content of the amorphous fine particles is within the above range, the physical properties of the writing touch can be easily obtained.

The content of the spherical fine particles in the coating composition C is preferably 3% by mass or more, particularly preferably 4% by mass or more, and further preferably 5% by mass or more. The content of the spherical fine particles is preferably 40% by mass or less, particularly preferably 35% by mass or less, and further preferably 30% by mass or less. When the content of the spherical fine particles is in the above-mentioned range, the physical properties of writing touch can be easily obtained.

(1-1-3) Photopolymerization initiator

When ultraviolet rays are used as the active energy rays for curing the active energy ray-curable components, the coating composition C preferably contains a photopolymerization initiator. By including a photopolymerization initiator, the active energy ray-curable component can be effectively polymerized, and the polymerization hardening time and the amount of ultraviolet radiation can be reduced.

Examples of such a photopolymerization initiator 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-phenylpropane-1- Ketone, 1-hydroxycyclohexylphenyl ketone, 2-methyl-1- [4- (methylthio) phenyl] -2-morpholinyl-propane-1-one, 4- (2-hydroxyethoxy Phenyl) phenyl-2- (hydroxy-2-propyl) ketone, diphenyl ketone, p-phenyldiphenyl ketone, 4,4'-diethylaminodiphenyl ketone, dichlorodiphenyl Ketones, 2-methylanthraquinone, 2-ethylanthraquinone, 2-tert-butylanthraquinone, 2-aminoanthraquinone, 2-methyl thioxanthone, 2-ethyl 2-ethylthioxanthone, 2-chlorothioxanthone, 2,4-dimethylthioxanthone, 2,4-diethyl 2,4-diethylthioxanthone, benzyl dimethyl ketal, acetophenone dimethyl ketal, p-dimethylaminobenzoate (p -dime thylaminobenzoic acid ester), oligo [2-hydroxy-2-methyl-1 [4- (1-methylvinyl) phenyl] acetone], 2,4,6-trimethylbenzylfluorenyl-diphenyl -Phosphine oxide and the like. These can 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 relative to 100 parts by mass of the active energy ray-curable component, particularly preferably 0.1 parts by mass or more, and further preferably 1 part by mass or more. Better. The content of the photopolymerization initiator is preferably 20 parts by mass or less, particularly preferably 10 parts by mass or less, and further preferably 5 parts by mass or less.

(1-1-4) Other ingredients

In addition to the above components, the coating composition C may contain various additives. Examples of the various additives include leveling agents, ultraviolet absorbers, antioxidants, light stabilizers, antistatic agents, silane coupling agents, aging inhibitors, thermal polymerization inhibitors, colorants, and surfactants. , Preservative stabilizer, plasticizer, lubricant, defoamer, wettability improver, coating improver, etc.

(1-2) Thickness of writing touch improvement layer

The lower limit of the thickness of the writing touch improvement layer 10 is preferably 0.5 μm or more, more preferably 0.7 μm or more, particularly preferably 1.0 μm or more, and even more preferably 1.3 μm or more. By setting the lower limit value of the thickness of the writing touch improving layer 10 to be as described above, the physical properties of the writing touch can be easily satisfied, and at the same time, good scratch resistance can be obtained. In addition, the thickness of the writing touch improvement layer 10 is preferably an upper limit of 20 μm or less, particularly 15 μm or less, and further preferably 10 μm or less. By setting the upper limit value of the thickness of the writing touch-enhancing layer 10 as described above, it is possible to effectively prevent the incorporation of residual solvents or bubbles due to the manufacturing process, and it is easy to obtain a good writing touch-enhancing layer 10 while satisfying the above writing Tactile physical properties.

(2) Substrate film

The substrate film 21 may be appropriately selected from those suitable for use as a touch panel user using a stylus pen, and a plastic film having good affinity with the writing touch-sensing layer 10 is preferably selected.

Examples of the relevant plastic film include polyester films such as polyethylene terephthalate, polybutylene terephthalate, and polyethylene naphthalate, polyethylene films, and polypropylene Polyolefin film such as film, celluloid film, cellulose diacetate film, cellulose triacetate film, cellulose acetate butyl film, polyvinyl chloride film, polyvinylidene chloride film, polyvinyl alcohol film, ethylene-vinyl acetate Ester copolymer film, polystyrene film, polycarbonate film, polymethylpentene film, polyfluorene film, polydiether ketone film, polyether resin film, polyether resin imine film, fluororesin film, polyfluorene film Plastic films such as amine film, acrylic resin film, polyurethane resin film, norbornene-based polymer film, cyclic olefin-based polymer film, cyclic conjugated diene-based polymer film, ethylene alicyclic hydrocarbon polymer film, or These laminated films. Among them, a polyethylene terephthalate film, a polycarbonate film, and a norbornene-based polymer that can maintain the writing touch of the stylus when combined with the writing touch-improving layer 10 are preferred. The film is preferably a polyethylene terephthalate film.

In addition, in the above-mentioned base film 21, for the purpose of improving the adhesion with the layer (writing touch-improving layer 10, the following adhesive layer, etc.) provided on the surface thereof, it may be on one side or both sides as required. The surface treatment is performed by a primer treatment, an oxidation method, an uneven method, and the like. Examples of the oxidation method include corona discharge treatment, chromic acid treatment, flame treatment, hot air treatment, and ozone-ultraviolet treatment. Examples of the unevenness method include sandblasting, solvent treatment, and the like. These surface treatment methods can be appropriately selected according to the type of the base film 21. As an example, a plastic film with an easy-to-adhere layer is formed by a primer treatment, and a polyethylene terephthalate film is preferably used.

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

(3) Adhesive layer

The first adhesive layer 22a, the second adhesive layer 22b, and the third adhesive layer 22c may be formed according to an adhesive or an adhesive sheet that is individually required. As the adhesive constituting such an adhesive layer, it can be used as a regular user of optical applications, and examples thereof include an acrylic adhesive, a rubber adhesive, a silicone adhesive, a urethane adhesive, and a polyester adhesive. Adhesives, polyvinyl ether adhesives, etc. Among them, acrylic adhesives which exhibit desired adhesiveness, excellent optical characteristics, and durability are preferred.

The thicknesses of the first adhesive layer 22a, the second adhesive layer 22b, and the third adhesive layer 22c are each preferably 5 to 1,000 μm, particularly 7 to 500 μm, and more preferably 10 to 250 μm. .

(4) Covering material

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

In addition, functional layers such as a hard coat layer, an anti-reflection layer, and an anti-glare layer may be provided on one or both sides of the glass plate or plastic plate, or a hard coating film, an anti-reflection film, and an anti-glare film may be laminated. And other optical components.

In this embodiment, the surface of the covering material 23 on the side of the second adhesive layer 22b may have a height difference due to a printing layer or the like (not shown). This printed layer is generally formed in a frame shape when viewed from a planar perspective.

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

(5) Touch sensor

In the touch panel 1A, the first touch sensor 24a and the second touch sensor 24b serve as a function of detecting the position of a touch point.

The touch sensors 24a and 24b are generally preferably composed of a transparent film and a patterned transparent conductive film, but they are 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 can be used, for example, a polyethylene terephthalate film, a polyethylene naphthalate film, a polycarbonate film, a polymethyl methacrylate film, and triacetic acid. Cellulose film, polypropylene film, etc.

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; tin-doped indium oxide (ITO); Complex oxides such as zinc oxide indium oxide, fluorine-doped indium oxide, antimony-doped tin oxide, fluorine-doped tin oxide, aluminum-doped zinc oxide, chalcogenide, lanthanum hexaboride Among those formed from non-oxidizing compounds such as titanium nitride, titanium carbide, and the like, those formed from tin-doped indium oxide (ITO) are preferred.

The thicknesses of the touch sensors 24a and 24b are preferably 10 to 300 μm, particularly 15 to 250 μm, and more preferably 20 to 200 μm.

(6) Light diffusion layer

The light diffusing layer 30 in this embodiment is preferably one having adhesion for bonding to the second touch sensor 24b and the display body module 4, and is preferably made of an adhesive having light diffusion. Make up. The related adhesive light diffusing layer can also be called "adhesive light diffusing layer".

(6-1) Material of light diffusion layer

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

The adhesive component is not particularly limited as long as it exhibits the adhesiveness required for a touch panel or the like, has light permeability, and does not hinder the effect caused by the light-diffusing fine particles. Examples of the related adhesive component include, for example, an acrylic adhesive component, a rubber adhesive component, a silicone adhesive component, a polyurethane adhesive component, and a polyester adhesive component. Among them, acrylic adhesive is used from the above viewpoint. Ingredients are better.

The acrylic adhesive component is preferably one containing a (meth) acrylate polymer (A), and particularly the (meth) acrylate polymer (A) which is crosslinked by a crosslinking agent (B) is Better. In addition, in this specification, the term "copolymer" is also included in "polymer".

(6-1-1) (meth) acrylate polymer (A)

The (meth) acrylate polymer (A), as a monomer constituting the polymer, preferably contains an alkyl (meth) acrylate having an alkyl carbon number of 1 to 20. As a result, the obtained light diffusion layer 30 can exhibit better adhesion. The (meth) acrylate polymer (A) is preferably composed of an alkyl (meth) acrylate having an alkyl carbon number of 1 to 20, and a functional group monomer (containing A copolymer of a reactive functional monomer) and other monomers that can be used as required.

Examples of the alkyl (meth) acrylate having 1 to 20 alkyl carbons include methyl (meth) acrylate, ethyl (meth) acrylate, propyl (meth) acrylate, and (meth) acrylic acid. N-butyl ester, n-amyl (meth) acrylate, n-hexyl (meth) acrylate, 2-ethylhexyl (meth) acrylate, isooctyl (meth) acrylate, n-decyl (meth) acrylate , N-dodecyl (meth) acrylate, myristyl (meth) acrylate, palmityl (meth) acrylate, stearyl (meth) acrylate, and the like. Among them, from the viewpoint of further improving adhesion, (meth) acrylates having 1 to 8 alkyl carbons are preferable, and (meth) acrylate, n-butyl (meth) acrylate, and ( 2-ethylhexyl meth) acrylate. These may be used alone or in combination of two or more.

The (meth) acrylate polymer (A), as a monomer unit constituting the polymer, preferably contains 30 to 95% by mass of an alkyl (meth) acrylate having an alkyl carbon number of 1 to 20, and particularly preferably The content is preferably 40 to 90% by mass, and more preferably 50 to 85% by mass.

Preferred examples of the reactive functional group-containing monomer include a monomer having a hydroxyl group in the molecule (hydroxyl-containing monomer), a monomer having a carboxyl group in the molecule (carboxyl-containing monomer), and an amine group in the molecule. Monomer (amine-containing monomer) and the like.

Examples of the hydroxyl-containing monomer include 2-hydroxyethyl (meth) acrylate, 2-hydroxypropyl (meth) acrylate, 3-hydroxypropyl (meth) acrylate, and 2 (meth) acrylate -Hydroxybutyl (meth) acrylate, etc., such as hydroxybutyl, 3-hydroxybutyl (meth) acrylate, and 4-hydroxybutyl (meth) acrylate. Among them, from the viewpoint of the reactivity of the hydroxyl group with the crosslinking agent (B) and the copolymerizability with other monomers in the (meth) acrylate polymer (A) obtained, the (meth) acrylic acid 2- Hydroxyethyl esters are preferred. These can 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, butenoic acid, maleic acid, itaconic acid, and citraconic acid. These can be used alone or in combination of two or more.

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

When the (meth) acrylate polymer (A) contains a reactive functional group-containing monomer as a monomer constituting the polymer, its content is preferably 5 to 35% by mass, particularly 10 to 30% by mass. It is better to further set it to 20 to 25 mass%.

The (meth) acrylate polymer (A) may contain other monomer as a monomer unit which comprises this polymer as needed. The other monomer is preferably a monomer that does not contain a reactive functional group. Examples of other related monomers include alkoxyalkyl (meth) acrylates such as methoxyethyl (meth) acrylate and ethoxyethyl (meth) acrylate, and (meth) acrylic acid. Cyclohexyl and the like having an aliphatic ring (meth) acrylate, N, N-dimethylaminoethyl (meth) acrylate, N, N-dimethylaminopropyl (meth) acrylate, etc. Non-crosslinkable tertiary amine (meth) acrylate, vinyl acetate, styrene, and the like. These can be used alone or in combination of two or more.

The polymerization state of the (meth) acrylate polymer (A) may be a random copolymer or a block copolymer.

The weight average molecular weight of the (meth) acrylate polymer (A) is preferably 100,000 to 2 million, particularly 200,000 to 1.3 million, and more preferably 300,000 to 800,000. In addition, the weight average molecular weight in this specification is a standard polystyrene conversion value measured by the gel permeation chromatography (GPC) method.

In the adhesive composition P, a (meth) acrylate polymer (A) may be used individually by 1 type, and may be used in combination of 2 or more type.

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

When the adhesive component of the adhesive composition P includes a (meth) acrylate polymer (A) containing a reactive functional group-containing monomer as a monomer unit constituting the polymer and a crosslinking agent (B), When the adhesive composition P is heated or the like, the crosslinking agent (B) reacts with the reactive functional group of the reactive functional group-containing monomer constituting the (meth) acrylate polymer (A). In this way, the (meth) acrylate polymer (A) is cross-linked by the cross-linking agent (B) to form a structure, thereby improving the strength, durability, and the like of the light diffusion layer 30.

The crosslinking agent (B) may be any compound capable of reacting with a reactive functional group of the (meth) acrylate polymer (A), and examples thereof include an isocyanate-based crosslinking agent and an epoxy resin. Resin-based crosslinking agent, amine-based crosslinking agent, melamine-based crosslinking agent, aziridine-based crosslinking agent, hydrazine-based crosslinking agent, aldehyde-based crosslinking agent, oxazoline Based crosslinking agents, metal alkoxide based crosslinking agents, metal adduct based crosslinking agents, metal salt based crosslinking agents, ammonium salt based crosslinking agents, and the like. Among them, when the reactive functional group of the (meth) acrylate polymer (A) is a hydroxyl group, it is preferable to use an isocyanate-based crosslinking agent having excellent reactivity with the hydroxyl group. If the (meth) acrylate polymerizes When the reactive functional group of the substance (A) is a carboxyl group, it is preferable to use an epoxy resin-based crosslinking agent having excellent reactivity with the carboxyl group. Moreover, a crosslinking agent (B) can be used individually by 1 type or in combination of 2 or more types.

The isocyanate-based crosslinking agent includes at least a polyisocyanate compound. Examples of the polyisocyanate compound include aromatic polyisocyanates such as toluene diisocyanate, diphenylmethane diisocyanate, xylylene diisocyanate, aliphatic polyisocyanates such as cyclohexane diisocyanate, and isophorone. Alicyclic polyisocyanates, such as diisocyanates, hydrogen-added diphenylmethane diisocyanates, etc., and these biuret bodies, isocyanurates, or with ethylene glycol, Adducts of reactants containing low-molecular active hydrogen compounds such as propylene glycol, neopentyl glycol, trimethylolpropane, and castor oil. Among them, from the viewpoint of reactivity with a hydroxyl group, an aromatic polyisocyanate modified with trimethylolpropane is preferred, and toluene diisocyanate modified with trimethylolpropane and benzenediene modified with trimethylolpropane are particularly preferred. Methyl diisocyanate is preferred.

Examples of the epoxy resin-based crosslinking agent include 1,3-bis (N, N'-diglycidylaminomethyl) cyclohexane, and N, N, N ', N'-tetraglycidyl. -M-xylylene diamine, ethylene glycol diglycidyl ether, 1,6-hexanediol diglycidyl ether, trimethylolpropane diglycidyl ether, diglycidyl aniline, diglycidyl Amines, etc.

The content of the crosslinking agent (B) in the adhesive composition P is preferably 0.001 to 10 parts by mass relative to 100 parts by mass of the (meth) acrylate polymer (A), and particularly 0.01 to 5 parts by mass Part is better, and more preferably 0.02 to 1 part by mass.

(6-1-3) Light diffusing fine particles

As the light-diffusing fine particles, the total haze may be in the above range, and examples thereof include inorganic fine particles such as silicon dioxide, calcium carbonate, aluminum hydroxide, magnesium hydroxide, clay, talc, and titanium dioxide; Organic light-transmitting particles such as acrylic resin such as methyl acrylate resin, polystyrene resin, polymethyl methacrylate-polystyrene copolymer, polyethylene resin, epoxy resin; silicone resin and the like Fine particles formed of a silicon-containing compound having an intermediate structure between inorganic and organic materials (for example, Tospearl series manufactured by Momentive Performance Materials-Japan). Among them, fine particles formed of acrylic resin fine particles, polymethyl methacrylate-polystyrene copolymer fine particles, and silicon-containing compounds having an intermediate structure between inorganic and organic are excellent in dispersibility of the above-mentioned adhesive components, and can obtain uniformity The optical characteristics are better. The above light-diffusing fine particles may be used singly or in combination of two or more kinds.

As the shape of the light-diffusing fine particles, it is preferable that the light-diffusing fine particles have a uniform spherical shape, and particularly, fine spherical particles are preferable. The average particle diameter of the light-diffusing fine particles measured by a laser diffraction method is preferably 0.1 m or more, particularly preferably 1 m or more, and more preferably 2 m or more. The average particle diameter is preferably 20 μm or less, particularly preferably 10 μm or less, and more preferably 8 μm or less. When the average particle diameter is in the above range, the light transmittance of the light diffusion layer 30 is not hindered, and the total haze value can be easily made into the above range.

In addition, the average particle diameter measured by the above-mentioned laser diffraction method was measured by using a laser diffraction scattering particle size distribution measuring device by sufficiently stirring 1.2 g of fine particles and 98.8 g of isopropyl alcohol as a measurement sample. value.

When the adhesive composition P contains a (meth) acrylate polymer (A) as an adhesive component, the content of the light-diffusing fine particles is 0.01 parts by mass or more with respect to 100 parts by mass of the (meth) acrylate polymer (A). Preferably, it is more preferably 0.1 parts by mass or more. The content of the light-diffusing fine particles is preferably 15 parts by mass or less, particularly preferably 10 parts by mass or less, and further preferably 5 parts by mass or less. When the content of the light diffusing fine particles is within the above range, the light permeability of the light diffusing layer 30 is not hindered, and the total haze value can be easily made into the above range. In addition, it is easy to sufficiently exhibit adhesion to other members adjacent to the light diffusion layer 30, and it is possible to prevent defects such as accidental peeling from occurring. When the adhesive component is other than the acrylic adhesive component, the content of the light-diffusing fine particles is preferably within the above range with respect to 100 parts by mass of the adhesive component.

(6-1-4) Various additives

The adhesive composition P may also 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 softener, a filler, etc., as needed. .

(6-2) Production of adhesive composition

The adhesive composition P can be produced by mixing an adhesive component, light-diffusing fine particles, and additives as needed. When the adhesive component contains a (meth) acrylate polymer (A), the (meth) acrylate polymer (A) is first prepared, and a cross-linking agent (B) that meets the requirements is prepared.

The (meth) acrylate polymer (A) can be produced by polymerizing a mixture of monomer units constituting the polymer by a usual radical polymerization method. The polymerization of the (meth) acrylate polymer (A) can be performed by a solution polymerization method or the like using a polymerization initiator as necessary. Examples of the polymerization solvent include ethyl acetate, n-butyl acetate, isobutyl acetate, toluene, acetone, hexane, and methyl ethyl ketone, and two or more of them may be used in combination.

Examples of the polymerization initiator include, for example, an azo compound, an organic peroxide, and the like, and two or more of them may be used in combination. Examples of the azo-based compound include 2,2'-azobisisobutyronitrile, 2,2'-azobis (2-methylbutyronitrile), and 1,1'-azobis (cyclo Hexane 1-carbonitrile), 2,2'-azobis (2,4-dimethylvaleronitrile), 2,2'-azobis (2,4-dimethyl-4-methoxy) Valeronitrile), dimethyl 2,2'-azobis (2-methylpropionic acid), 4,4'-azobis (4-cyanovaleric acid), 2,2'-azobis (2 -Hydroxymethylpropionitrile), 2,2'-azobis [2- (2-imidazolin-2-yl) propane], and the like.

Examples of the organic peroxide include benzamidine peroxide, third butyl peroxybenzoate, cumene hydroperoxide, diisopropyl peroxide, di-n-propyl peroxydicarbonate, Di (2-ethoxyethyl) peroxydicarbonate, t-butyl peroxyneodecanoate, t-butyl peroxybivalate, peroxy (3,5,5-trimethylhexylfluorenyl), dipropylfluorenyl peroxide, diethylfluorenyl peroxide, and the like.

In addition, in the above-mentioned polymerization step, by adjusting a chain transfer agent such as 2-mercaptoethanol, the weight average molecular weight of the obtained polymer can be adjusted.

After the (meth) acrylate polymer (A) is obtained, to the solution of the (meth) acrylate polymer (A), light-diffusing fine particles, a cross-linking agent (B), and additives as necessary are added. The mixture was mixed to obtain an adhesive composition P (coating solution) diluted with a solvent.

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 dichloromethane and dichloroethane; methanol; Alcohols such as ethanol, propanol, butanol, 1-methoxy-2-propanol, acetone, methyl ethyl ketone, 2-pentanone, isophorone, cyclohexanone and other ketones, ethyl acetate, butyl acetate An ester such as an ester, an ethylcellulose-based solvent such as ethyl cellosolve, and the like.

The concentration and viscosity of such a prepared coating liquid are not particularly limited as long as they are in a range in which they can be applied, and can be appropriately selected depending on the situation. For example, it dilutes so that the density | concentration of the adhesive composition P may become 10-40 mass%. In addition, when a coating liquid is obtained, the addition of a diluent solvent or the like is not necessary, and the diluent solvent may not be added as long as the adhesive composition P has a coatable viscosity or the like.

(6-3) Thickness of light diffusion layer

The lower limit of the thickness of the light diffusing layer 30 (value measured based on JIS K7130) is preferably 5 μm or more, particularly 7.5 μm or more, and even more preferably 10 μm or more. The upper limit value is preferably 500 μm or less, more preferably 250 μm or less, particularly preferably 100 μm or less, and even more preferably 50 μm or less. Since the lower limit value of the thickness of the light diffusing layer 30 is as described above, both the required adhesiveness and optical characteristics can be achieved. On the other hand, by setting the upper limit value of the thickness of the light diffusion layer 30 as described above, it is possible to suppress the obtained touch panel 1A from becoming unnecessarily thick. In addition, the light diffusion layer 30 may be formed in a single layer, or may be formed by stacking a plurality of layers.

(7) Display body module

The display module 4 in this embodiment may be a liquid crystal module having the above-mentioned structure as an example. The display module 4 or the components constituting the display module 4, that is, the first glass substrate 41a, the module adhesive layer 42, the first polarizing plate 43a, the second glass substrate 41b, the color filter film 44, As the liquid crystal layer 45, the third glass substrate 41c, the second polarizing plate 43b, and the backlight 47, those skilled in the art can be used.

As described above, in the touch panel 1A according to this embodiment, the distance between the light diffusion layer 30 and the color filter film 44 is 4 mm or less. When the display module 4 is used, the distance is the total thickness of the first glass substrate 41a, the module 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 μm, and preferably 0.3 to 1500 μm. The thickness of the module adhesive layer 42 is usually 1 to 1000 μm, and preferably 5 to 750 μm. The thickness of the first polarizing plate 43a is usually 1 to 1000 μm, and preferably 3 to 750 μm. The thickness of each member is appropriately selected so that the distance between the light diffusion layer 30 and the color filter film 44 is 4 mm or less.

3. Manufacturing method of touch panel

The touch panel 1A according to this embodiment can be manufactured according to a commonly used method. However, an example of a preferred manufacturing method will be described.

(1) Formation of the writing touch improvement layer

A writing touch improvement layer 10 is formed on the base film 21. Specifically, it is preferable that the coating composition for the writing touch improving layer 10 is a coating liquid containing the coating composition C and a solvent as needed, and the base film 21 is coated and hardened to form a writing touch. Sense lifting layer 10.

The solvent can be used for improving coating properties, adjusting viscosity, adjusting solid content concentration, and the like, as long as it can dissolve hardening components and the like, disperse fine particles, and the like, and it can be used without particular limitation.

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; acetic acid Ester esters of ethyl acetate, butyl acetate, ethyl lactate, γ-butyrolactone, etc .; ethylene glycol monomethyl ether (methyl cyrus), ethylene glycol monoethyl ether (ethyl cyrus), diethyl Ethers such as glycol monobutyl ether (butylcellulose), propylene glycol monomethyl ether; aromatic hydrocarbons such as benzene, toluene, xylene; dimethylformamide, dimethylacetamide, N -Amidoamines such as N-methylpyrrolidone.

The coating liquid of the coating composition may be applied by a commonly used method, and may be, for example, a bar coating method, a knife coating method, a roll coating method, a doctor blade coating method, a die coating method, The gravure coating method may be performed. The coating liquid for coating the coating composition is preferably dried at 40 to 120 ° C for about 30 seconds to 5 minutes.

For example, when the coating composition of coating composition C is active energy ray-curable, curing of the coating composition can be performed by irradiating the coating film of the coating composition with active energy rays such as ultraviolet rays and electron beams. Ultraviolet radiation can be performed by a high-pressure mercury lamp, a fusion H lamp, a xenon lamp, etc. The irradiation amount of ultraviolet rays is preferably about 50 to 1000 mW / cm ² and the light amount is about 50 to 1000 mJ / cm ² . 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 a light diffusion layer

The light diffusion layer 30 is preferably formed on a release surface (a surface having a release property) of the release sheet, and is preferably a light diffusion layer sheet. The light diffusing layer 30 in this embodiment is preferably formed of the adhesive composition P. Therefore, it is preferable to apply the coating liquid containing the adhesive composition P and the solvent as needed to the release surface of a release sheet, and to heat-process to form a coating layer. If the maturation period is required, the maturation period is performed, and if the maturation period is not required, the original coating layer is kept as the light diffusion layer 30 to obtain a light diffusion layer sheet. In addition, the above-mentioned heat treatment can be combined with the drying treatment when the solvent or the like of the adhesive composition P is volatilized.

When the adhesive composition P contains a (meth) acrylate polymer (A), the heating temperature of the heat treatment is preferably 50 to 150 ° C, and particularly preferably 70 to 120 ° C. In addition, the heating time is preferably 30 seconds to 10 minutes, and particularly preferably 50 seconds to 2 minutes. After the heat treatment, if necessary, it may be left at a normal temperature (for example, 23 ° C, 50% RH) for a maturing period of about 1 to 2 weeks. If the maturation period is required, after the maturation period has elapsed, if the maturation period is not required, the light diffusion layer 30 is formed after the heat treatment is completed.

In addition, the coating method of the coating liquid containing the solvent or the adhesive composition P mixed with the adhesive composition P is the same as the method of coating the solvent or the coating liquid of the coating composition for the writing touch improvement layer 10. .

(3) Formation of an adhesive layer

The first adhesive layer 22a, the second adhesive layer 22b, and the third adhesive layer 22c are preferably formed on the release surface of the release sheet to form an adhesive sheet. For example, a coating solution containing an adhesive composition for each adhesive layer and a solvent as needed is applied to the release surface of a release sheet and dried to form an adhesive layer to obtain an adhesive sheet.

(4) Lamination of each component

The lamination of each member may be performed manually using a pressure roller, or may be performed automatically using a bonding device. The order of laminating each member is not particularly limited, and the method shown below is only an example.

First, in the adhesive sheet of the first adhesive layer 22a, the first adhesive layer 22a is laminated on a surface of the base film 21 on which the writing-touch-improving layer 10 is formed on the side opposite to the writing-touch-improving layer 10 side. Then, the release sheet is peeled, and the exposed first adhesive layer 22 a is bonded to the cover material 23.

On the other hand, in the adhesive sheet of the third adhesive layer 22c, the third adhesive layer 22c is laminated on the first touch sensor 24a. Then, the release sheet of the adhesive sheet of the third adhesive layer 22c is peeled off, and the exposed third adhesive layer 22c is bonded to the second touch sensor 24b. Next, on the surface of the first touch sensor 24a opposite to the side of the third adhesive layer 22c, the second adhesive layer 22b in the adhesive sheet of the second adhesive layer 22b is bonded. In addition, the light diffusion layer 30 of the light diffusion layer is bonded to the surface of the second touch sensor 24b opposite to the third adhesive layer 22c side.

Next, the release sheet is peeled from the adhesive sheet of the second adhesive layer 22b, and the exposed second adhesive layer 22b is bonded to the cover material 23 on the side opposite to the first adhesive layer 22a side. Finally, the release sheet is peeled from the light diffusion layer sheet, and the exposed light diffusion layer 30 is bonded to the first glass substrate 41 a of the display module 4. Thereby, the touch panel 1A shown in FIG. 1 is manufactured.

The touch panel 1A described above has excellent writing touch using a stylus, suppresses glare, and has good visibility in displaying an image.

[Second Embodiment]

In the touch panel 1A according to the first embodiment, the light diffusion layer 30 is provided adjacent to the display body module 4. However, the present invention is not limited to this, and may also be provided in the writing touch-sensitive enhancement layer 10 and the display. Arbitrary position between body modules 4.

For example, as in the touch panel 1B according to the second embodiment shown in FIG. 2, the light diffusion layer 30 may be provided between the base film 21 and the cover material 23. If this is the case, in the touch panel 1A according to the first embodiment, the first adhesive layer 22a is replaced by the light diffusion layer 30, and a fourth adhesive layer is provided at the position where the light diffusion layer 30 originally exists. 22d. The fourth adhesive layer 22d may have the same structure as the first adhesive layer 22a, the second adhesive layer 22b, or the third adhesive layer 22c.

Here, even for the touch panel 1B according to this embodiment, the total haze from the writing touch-sensing enhancement layer 10 to the light diffusion layer 30 (in this embodiment, the writing touch-sensing enhancement layer 10 and the substrate film 21 And the total haze of the light diffusing layer 30) must be 12% or more and 45% or less, and the distance between the light diffusing layer 30 and the color filter film 44 must be 4mm or less.

The light diffusion layer 30 in the touch panel 1B according to this embodiment is basically preferably the same as the light diffusion layer 30 in the touch panel 1A according to the first embodiment. However, the light diffusing fine particles in the adhesive composition P are preferably light diffusing fine particles formed of a silicon-containing compound having an intermediate structure between organic and inorganic, such as a silicone resin. In addition, the content of the light-diffusing fine particles in the adhesive composition P is preferably 0.01 parts by mass or more, and more preferably 0.1 parts by mass or more, based on 100 parts by mass of the (meth) acrylate polymer (A). It is more preferably 0.5 parts by mass or more. The content of the light-diffusing fine particles is preferably 15 parts by mass or less, particularly preferably 12 parts by mass or less, and further preferably 10 parts by mass or less. Since the content of the light diffusing fine particles is within the above range, the light penetrability of the light diffusing layer 30 is not hindered, and the total haze value can be easily made into the above range. In addition, other members adjacent to the light diffusion layer 30 can easily exhibit sufficient adhesiveness, and can prevent defects such as accidental peeling from occurring.

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

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, in the touch panel 1A according to the first embodiment, the second adhesive layer 22b or the third adhesive layer 22c may be replaced by a light diffusion layer. In this case, the light diffusion layer 30 in the touch panel 1A according to the first embodiment can be the same adhesive layer as the first to third adhesive layers 22a to 22c.

In addition, for example, a light-diffusion layer 30 may be provided between the writing-touch-improving layer 10 and the base film 21 in a manner adjacent to the writing-touch-improving layer 10. The related touch panel can be basically 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, a writing touch is formed on the light diffusion layer 30. Lifting the layer 10 is different in this regard. The light diffusing layer 30 can be laminated on the base film 21 in the same manner as the touch panel 1A according to the first embodiment using a light diffusing sheet. When the light diffusion layer 30 is provided between the writing touch improvement layer 10 and the base film 21, the light diffusion layer 30 may not have adhesiveness. In this case, for example, the light-diffusion layer 30 can also be formed using the coating composition containing hardening components, such as an active energy ray hardening component and a thermosetting component, and fine particles similarly to the writing touch improvement layer 10.

[Third Embodiment]

In the touch panel 1A according to the first embodiment, the position detection function is performed by the first touch sensor 24a and the second touch sensor 24b existing outside the display module 4. However, the present invention Not limited to this, the display module may be a person having a position detection function.

For example, the touch panel 1C according to the third embodiment shown in FIG. 3 may have the following structure: the writing touch-sensing enhancement layer 10; the stylus pen on the writing touch-sensing enhancement layer 10 not contacting the side (the first 3, lower side), a base film 21 having a writing touch-improving layer 10 formed thereon; an adhesive layer 22 for bonding the base film 21; and a base film 21 being bonded to the base film 21 via the adhesive layer 22 A covering material 23; an adhesive light diffusing layer 30 for bonding the covering material 23; and a display body module 5 having a position detection function bonded to the covering material 23 through the light diffusing layer 30.

The display module 5 is not particularly limited as long as it has a color filter film and a position detection function (touch sensor). Generally, a liquid crystal (LCD) module and a light emitting diode (LED) are used. Modules, organic electroluminescence (organic EL) modules, etc. FIG. 3 illustrates a liquid crystal module as an example. The display body module 5 in this embodiment has the following structure: a first glass substrate 51a adjacent to the light diffusion layer 30; a first module adhesive layer 52a located below the first glass substrate 51a; The first polarizing plate 53a under the module adhesive layer 52a; the second glass substrate 51b under the first polarizing plate 53a; the color filter film 54 under the second glass substrate 51b; the color filter film 54 liquid crystal layer 55 on the lower side; second module adhesive layer 52b on the lower side of the liquid crystal layer 55; first touch sensor 56a on the lower side of the second module adhesive layer 52b; on the first touch The third module adhesive layer 52c on the lower side of the sensor 56a; the second touch sensor 56b on the lower side of the third module adhesive layer 52c; the second touch sensor 56b on the lower side of the second touch sensor 56b 4 module adhesive layer 52d; third glass substrate 51c located under the fourth module adhesive layer 52d; second polarizing plate 53b located under the third glass substrate 51c; and under the second polarizing plate 53b Backlight 57.

The manufacturing of the touch panel 1C according to this embodiment can be basically 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 body module 5. However, the present invention is not limited to this, and may be provided in the writing touch improvement layer 10 And the display body module 5.

For example, as in the touch panel 1D according to the fourth embodiment shown in FIG. 4, the light diffusion layer 30 may be provided between the base film 1 and the cover material 23. In this case, in the touch panel 1C according to the third embodiment, the adhesive layer 22 is replaced by the light diffusion layer 30, and the light diffusion layer 30 is replaced by the adhesive layer 22. This adhesive layer 22 may have the same structure as the adhesive layer 22 of the touch panel 1C according to the third embodiment.

The manufacturing of the touch panel 1D according to this embodiment can be basically performed in the same manner as 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, there is only one cover material 23. However, in order to adjust the distance between the light diffusion layer 30 and the color filter film 54 or to adjust the distance from the writing touch It is also possible to provide a plurality of covering materials (and an adhesive layer) for the total haze of the sensing enhancement layer 10 to the light diffusion layer 30. For example, as the fifth touch panel 1E shown in FIG. 5, two cover materials and two adhesive layers may be provided. Specifically, the fifth touch panel 1E has the following structure: a writing touch-sensing enhancement layer 10; a stylus pen located on the writing touch-sensing enhancement layer 10 is not in contact with the side (lower side in FIG. 5), and writing is formed. The base film 21 of the tactile enhancement layer 10; an adhesive light diffusion layer 30 located below the base film 21; a first covering material 23a bonded to the base film 21 via the light diffusion layer 30; A first adhesive layer 22a under the first covering material 23a; a second covering material 23b under the first adhesive layer 22a; a second adhesive layer 22b under the second covering material 23b; and A display body module 5 having a position detection function by bonding the second adhesive layer 22b and the second covering material 23b. The first covering material 23a may have a height difference due to a printing layer or the like, as in the covering material 23 described above. On the other hand, a covering material other than the first covering material 23a (the second covering material 23b in the present embodiment) usually does not have a height difference due to a printed layer or the like. The fifth touch panel 1E is a modified example based on the fourth touch panel 1D. However, the fifth touch panel 1E is not limited to this.

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, in the touch panel 1E according to the fifth embodiment, the first adhesive layer 22a or the second adhesive layer 22b is replaced by the light diffusion layer 30, and the light diffusion layer 30 is replaced with the first adhesive layer 22a or the second The adhesive layer 22b may be replaced by the same adhesive layer.

In addition, as long as the number of the covering material and the adhesive layer is within a predetermined range as long as the distance between the light diffusion layer 30 and the color filter film 54 and the total haze from the writing touch improvement layer 10 to the light diffusion layer 30 are within a predetermined range, Specially limited. For example, as the sixth touch panel 1F shown in FIG. 6 below, three cover materials and three adhesive layers may be provided.

The embodiments described above are described in order to make the present invention easier to understand, and are not described to limit the present invention. Therefore, all of the requirements disclosed in the above embodiments are all included in the scope of the present invention within the scope of the technology to which the present invention pertains.

For example, if the surface of the base film 21 satisfies the above-mentioned writing touch physical properties, the writing touch improving layer 10 as a coating layer is not necessary. In this case, the base film 21 itself becomes the writing touch improving layer.

(Example)

Hereinafter, the present invention will be described more specifically with examples and the like, however, the scope of the present invention is not limited to these examples and the like.

[Example 1]

(1) Formation of the writing touch improvement layer

100 parts by mass of an organic-inorganic hybrid resin (manufactured by Arakawa Chemical Industries, Ltd., trade name "OPSTAR Z7530") as a hardening component (expressed in terms of solid content. Hereinafter, the same applies to other components). 10 parts by mass of spherical crosslinked polymethylmethacrylate fine particles and 5 parts by mass of 1-hydroxycyclohexylphenyl ketone as a photopolymerization initiator were obtained to obtain a coating composition. This coating composition was diluted with propylene glycol monomethyl ether to prepare a coating solution.

A polyester film (manufactured by Toyobo Co., Ltd., trade name “COSMOSHINE A4300”, thickness: 125 μm) with a layer with an easy-to-adhesive layer as a base film was applied to the surface of the easy-to-adhesive layer side with a wire rod ( wire bar) # 14 coated and dried at 70 ° C for 1 minute. Next, an ultraviolet irradiation device (product name "Nitrogen Flushing Small Conveyor Belt UV Irradiation Device CSN2-40" manufactured by GS-YUASA Corporation) was irradiated with ultraviolet rays under the following conditions in the atmosphere to form a writing touch with a thickness of 5 μm. The layer is lifted to obtain a laminated body formed by the writing-touch-improving layer and the base film.

[UV irradiation conditions]

‧Light source: high pressure mercury lamp

‧Bulb power: 1.4kW

‧Conveyor speed: 1.2m / min

‧Illumination: 100mW / cm ²

‧Light: 240mJ / cm ² .

Regarding the thickness of the writing touch-improving layer, the total thickness of the laminated body was measured using a constant pressure thickness measuring device (manufactured by Teclock, trade name "PG-01J"), and the total thickness of the obtained laminated body and the substrate film were calculated The difference in thickness is used as the thickness of the writing touch enhancement layer.

(2) Formation of a 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 copolymer. When the molecular weight of this acrylate copolymer was measured by the following method, the weight average molecular weight (Mw) was 500,000.

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

<Measurement conditions>

‧GPC measurement device: manufactured by Tosoh Corporation, HLC-8020

‧GPC column (passed in the following order): made by Tosoh

TSK guard column HXL-H

TSK gel GMHXL (× 2)

TSK gel G2000HXL

‧Determination solvent: tetrahydrofuran

‧Measuring temperature: 40 ℃

100 parts by mass of the acrylate copolymer obtained in the above step, and 0.25 parts by mass of trimethylolpropane modified toluene diisohydroate (manufactured by Toyo-chem, trade name "BHS-8515") as a crosslinking agent 0.5 parts by mass with orthorhombic silicone fine particles (fine particles formed by a silicon-containing compound having an intermediate structure of inorganic and organic) with an average particle diameter of 2.0 μm (manufactured by Momentive Performance Materials-Japan, trade name "Tospearl 120") They were mixed and diluted with ethyl acetate to obtain a coating solution for an adhesive composition.

The release liquid of the coating composition of the adhesive composition obtained above was peeled off on one side of a polyethylene terephthalate film with a silicone-based release agent (manufactured by LINTEC, SP-PET3811, thickness : 38 μm) of the peeled surface, coated with a knife coater, and then heat-treated at 90 ° C. for 1 minute to form a light diffusion layer having a thickness of 10 μm to obtain a light diffusion layer sheet.

Regarding the thickness of the light diffusing layer, the total thickness of the light diffusing layer sheet was measured using a constant-pressure thickness measuring device (manufactured by Teclock, trade name "PG-01J"), and the total thickness of the obtained light diffusing layer sheet and the peeling were calculated The difference in sheet thickness is taken as the thickness of the light diffusion layer.

(3) Formation of an adhesive layer

100 parts by mass of the acrylate copolymer used in the light-diffusing layer was modified with toluene diisohydroate (produced by Toyo-chem Co., Ltd. under the trade name "BHS-8515") with trimethylolpropane as a crosslinking agent. 0.25 parts by mass was mixed and diluted with ethyl acetate to obtain a coating solution for an adhesive composition.

The release liquid of the coating composition of the adhesive composition obtained above was peeled off on one side of a polyethylene terephthalate film with a silicone-based release agent (manufactured by LINTEC, SP-PET 3811, Thickness: 38 μm) The peeled surface was coated with a knife coater and then heated at 90 ° C. for 1 minute to form an adhesive layer with a thickness of 100 μm to obtain an adhesive sheet.

Regarding the thickness of the adhesive layer, the total thickness of the adhesive sheet was measured using a constant-pressure thickness measuring device (trade name: "PG-01J" manufactured by Teclock, Inc.), and the total thickness of the obtained adhesive sheet and the thickness of the release sheet were calculated. Poor as the thickness of the adhesive layer.

(4) Lamination of each component

Each member is laminated as shown below to manufacture a touch panel having a structure (Configuration 1E) as shown in FIG. 5. The lamination of each member was performed manually using a pressure roller (2 kg, material in contact with the sample: rubber).

(a) First, a base film and a light-diffusing layer of a light-diffusing layer sheet in a laminate formed of a writing touch-improving layer and a base film are laminated.

(b) Next, the release sheet of the light-diffusion layer sheet was peeled from the light-diffusion layer, and the exposed light-diffusion layer was laminated with a first covering material (trade name “EAGLE XG” manufactured by Corning Corporation, thickness: 700 μm).

(c) Next, the first cover material and an adhesive layer (thickness: 100 μm) of the adhesive sheet are laminated. This adhesive layer corresponds to the first adhesive layer 22a in FIG. 5.

(d) Next, the release sheet of the adhesive sheet is peeled from the adhesive layer (first adhesive layer 22a), and the exposed adhesive layer (first adhesive layer 22a) and a second covering material (manufactured by Corning Corporation, Product name "EAGLE XG", thickness 1100 μm).

(e) Next, the second covering material and an adhesive layer (thickness: 100 μm) of the adhesive sheet are laminated. This adhesive layer corresponds to the second adhesive layer 22b in FIG. 5.

(f) Finally, the release sheet of the adhesive sheet is peeled from the adhesive layer (second adhesive layer 22b), and the exposed adhesive layer (second adhesive layer 22b) and the color filter film to the display phantom are peeled off. A display module (resolution: 264 ppi) with a distance of 1 mm up to the surface was stacked to obtain a touch panel having a structure (structure 1E) as shown in FIG. 5.

[Example 2]

As shown in Table 1, the materials of the writing touch improvement layer and the light diffusion layer were changed, and the proportion and thickness were adjusted. The thickness of the first covering material was changed to 1100 μm, which corresponds to the thickness and thickness of the adhesive layer of the first adhesive layer 22a. A touch panel was produced in the same manner as in Example 1 except that the thickness of the adhesive layer corresponding to the second adhesive layer 22 b was changed to 400 μm, respectively.

[Examples 3 and 4]

As shown in Table 1, the touch panel was produced in the same manner as in Example 1 except that the materials, the ratio, and the thickness of the writing tactile enhancement layer and the light diffusion layer were changed.

[Example 5]

As shown in Table 1, the materials of the writing touch improvement layer and the light diffusion layer were changed, and the proportion and thickness were adjusted. The structure of the touch panel was changed to the structure shown in FIG. 4 (composition 1D), and the adhesive layer was changed. A touch panel was produced in the same manner as in Example 1 except that the thickness was changed to 300 μm. The touch panel having the structure shown in FIG. 4 is manufactured as described below.

(a) First, the base film and the light-diffusion layer of a light-diffusion sheet are laminated | stacked in the laminated body formed from the writing touch improvement layer and a base film.

(b) Next, the release sheet of the light-diffusion layer sheet is peeled from the light-diffusion layer, and the exposed light-diffusion layer and a covering material (trade name "EAGLE XG", manufactured by Corning Corporation, thickness: 700 μm) are laminated.

(c) Next, the covering material and an adhesive layer (thickness: 300 μm) of the adhesive sheet are laminated.

(d) Finally, the release sheet of the adhesive sheet is peeled from the adhesive layer, and the exposed adhesive layer and the display module having a distance of 1 mm from the color filter film to the surface of the display module (resolution: (264 ppi) is laminated to obtain a touch panel having a structure (structure 1D) as shown in FIG. 4.

[Example 6]

As shown in Table 1, the touch panel was produced in the same manner as in Example 5 except that the materials, the ratio, and the thickness of the writing tactile enhancement layer and the light diffusion layer were changed.

[Comparative Example 1]

As shown in Table 1, the touch panel was produced in the same manner as in Example 1 except that the materials of the writing touch improvement layer and the light diffusion layer were changed, and the ratio and thickness were adjusted.

[Comparative Example 2]

As shown in Table 1, the touch panel was produced in the same manner as in Example 5 except that the materials, the ratio, and the thickness of the writing tactile enhancement layer and the light diffusion layer were changed.

[Comparative Example 3]

As shown in Table 1, the materials of the writing touch improvement layer and the light diffusion layer were changed, the proportion and thickness were adjusted, and the structure of the touch panel was changed to the structure shown in FIG. 6 (structure 1F), and the first covering A touch panel was produced in the same manner as in Example 1 except that the thickness of the material was changed to 1100 μm and the thickness of the adhesive layer was changed to 300 μm and 200 μm.

Here, the touch panel 1F shown in FIG. 6 has the following structure: the writing touch-sensing enhancement layer 10; the stylus pen located on the writing touch-sensing enhancement layer 10 is not in contact with the side (lower side in FIG. 6), A base film 21 having a writing touch-improving layer 10 formed thereon; an adhesive light diffusing layer 30 located below the base film 21; and a first covering material bonded to the base film 21 via the light diffusing layer 30 23a (thickness: 1100 μm); first adhesive layer 22a (thickness: 300 μm) on the lower side of the first covering material 23a; second covering material 23b (thickness: 1100 μm) on the lower side of the first adhesive layer 22a; The second adhesive layer 22b (thickness: 200 μm) under the second covering material 23b; the third covering material 23c (thickness: 1100 μm) under the second adhesive layer 22b; and the third covering material 23c under the third covering material 23c The third adhesive layer 22c (thickness: 200 μm); and the display module 5 having a position detection function bonded to the third cover material 23c via the third adhesive layer 22c.

The touch panel 1F having the configuration shown in FIG. 6 is manufactured as described below.

(a) First, the base film and the light-diffusion layer of a light-diffusion sheet are laminated | stacked in the laminated body formed from the writing touch improvement layer and a base film.

(b) Next, the release sheet of the light-diffusion layer sheet was peeled from the light-diffusion layer, and the exposed light-diffusion layer was laminated with a first covering material (trade name “EAGLE XG” manufactured by Corning Corporation, thickness 1100 μm).

(c) Next, the first covering material and an adhesive layer (thickness: 300 μm) of the adhesive sheet are laminated. This adhesive layer corresponds to the first adhesive layer 22a in FIG. 6.

(d) Next, the release sheet of the adhesive sheet is peeled from the adhesive layer (the first adhesive layer 22a), and the exposed adhesive layer (the first adhesive layer 22a) and the second covering material (manufactured by Corning) , Product name "EAGLE XG", thickness 1100μm).

(e) Next, the second covering material and an adhesive layer (thickness: 200 μm) of the adhesive sheet are laminated. This adhesive layer corresponds to the second adhesive layer 22b in FIG. 6.

(f) Next, the release sheet of the adhesive sheet is peeled from the adhesive layer (the second adhesive layer 22b), and the exposed adhesive layer (the second adhesive layer 22b) and a third covering material (manufactured by Corning Corporation, Product name "EAGLE XG", thickness 1100 μm).

(g) Next, the third covering material and an adhesive layer (thickness: 200 μm) of the adhesive sheet are laminated. This adhesive layer corresponds to the third adhesive layer 22c in FIG. 6.

(h) Finally, the release sheet of the adhesive sheet is peeled from the adhesive layer (third adhesive layer 22c), and the exposed adhesive layer (third adhesive layer 22c) and the color filter film to the display phantom are peeled off. A display body module (resolution: 264 ppi) with a distance of 1 mm up to the surface was stacked to obtain a touch panel having a structure (structure 1F) as shown in FIG. 6.

[Comparative Example 4]

The light diffusing layer used in Example 1 was changed to the adhesive layer (thickness 10 μm) used in Example 1, and the structure of the touch panel was changed to the structure shown in FIG. 7 (Configuration 1G). A touch panel was produced in the same manner as in Example 1.

Here, the touch panel 1G shown in FIG. 7 has the following structure: the writing touch-sensing enhancement layer 10; the stylus pen located on the writing touch-sensing enhancement layer 10 is not in contact with the side (lower side in FIG. 7), A base film 21 on which the writing touch improvement layer 10 is formed; a first adhesive layer 22a (thickness: 10 μm) on the lower side of the base film 21; a first covering material 23a on the lower side of the first adhesive layer 22a; The second adhesive layer 22b (thickness: 100 μm) on the lower side of the first covering material 23a; the second covering material 23b on the lower side of the second adhesive layer 22b; the third adhesive on the lower side of the second covering material 23b Layer 22c (thickness: 100 μm); and a display body module 5 having a position detection function bonded to the second cover material 23b via the third adhesive layer 22c.

The touch panel 1G having the configuration shown in FIG. 7 is manufactured as described below.

(a) First, a base film and an adhesive layer (thickness: 10 μm) of a laminate in a laminated body formed of a writing touch improvement layer and a base film are laminated. This adhesive layer corresponds to the first adhesive layer 22a in FIG. 7.

(b) Next, the release sheet of the adhesive sheet is peeled from the adhesive layer (the first adhesive layer 22a), and the exposed adhesive layer (the first adhesive layer 22a) and a first covering material (manufactured by Corning Corporation, Product name "EAGLE XG", thickness 700 μm).

(c) Next, the first covering material and an adhesive layer (thickness: 100 m) of the adhesive sheet are laminated. This adhesive layer corresponds to the second adhesive layer 22b in FIG. 7.

(d) Next, the release sheet of the adhesive sheet is peeled from the adhesive layer (second adhesive layer 22b), and the exposed adhesive layer (second adhesive layer 22b) and a second covering material (product of Corning, a product Named "EAGLE XG, thickness 1100 µm).

(e) Next, the second covering material and an adhesive layer (thickness: 100 μm) of the adhesive sheet are laminated. This adhesive layer corresponds to the third adhesive layer 22c in FIG. 7.

(f) Finally, the release sheet of the adhesive sheet is peeled from the adhesive layer (the third adhesive layer 22c), and the exposed adhesive layer (the third adhesive layer 22c) and the color filter film to the display phantom are peeled off. A display body module (resolution: 264 ppi) with a distance of 1 mm up to the surface was stacked to obtain a touch panel having a structure (structure 1G) as shown in FIG. 7.

[Reference Example 1]

As shown in Table 1, the touch panel was produced in the same manner as in Example 1 except that the materials, the ratio, and the thickness of the writing tactile enhancement layer and the light diffusion layer were changed.

The abbreviations and the like described in Table 1 are described in detail below.

A: Organic-inorganic hybrid resin (manufactured by Arakawa Chemical Industries, Ltd., trade name "OPSTAR Z7530")

B: Polyfunctional urethane acrylate (manufactured by Arakawa Chemical Industries, Ltd., trade name "BEAMSET 575CB)

C: Spherical crosslinked polymethyl methacrylate fine particles with an average particle diameter of 3 μm (CV value: 32%)

D: amorphous silicon dioxide fine particles with an average particle diameter of 4.5 μm (CV value: 35%)

E: amorphous silicon dioxide fine particles with an average particle diameter of 1.5 μm (CV value: 88%)

F: Spherical crosslinked polymethyl methacrylate fine particles with an average particle diameter of 1.5 μm (CV value: 23%)

G: 1-hydroxycyclohexylphenyl ketone (photopolymerization initiator)

H: An acrylate copolymer 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 a solution polymerization method (Mw: 500,000)

I: Spherical silicone fine particles (fine particles formed of a silicon-containing compound having an intermediate structure between inorganic and organic) with an average particle diameter of 2.0 μm (manufactured by Momentive Performance Materials-Japan, trade name "Tospearl 120")

J: Spherical polymethyl methacrylate-polystyrene copolymer fine particles with an average particle diameter of 3.5 μm

K: Trimethylolpropane modified toluene diisocyanate (manufactured by Toyo-chem, trade name "BHS-8515") (crosslinking agent).

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

In the touch panels manufactured in the examples and comparative examples, the distance between the light diffusion layer and the color filter film was calculated. In addition, as described above, in the display module (resolution: 264ppi) used in the examples and comparative examples, from the color filter film to the surface of the display module (the surface to which the adhesive layer is attached). The distance is 1mm. The results are shown in Table 2.

[Test Example 2] (Measurement of Haze Value)

In the touch panels manufactured in the examples and comparative examples, the total haze (%) and the internal haze (%) from the writing touch-improving layer to the light diffusion layer were measured using a haze meter (manufactured by Nippon Denshoku Industries Co., Ltd.). , Product name "NDH2000"), measured based on JIS K7105. The results are shown in Table 2.

Specifically, the haze of the laminated body of the writing touch improvement layer, the base film, the light diffusion layer (adhesive layer in Comparative Example 4), and the release sheet obtained in the manufacturing process in Examples and Comparative Examples was measured. The total haze is calculated by subtracting the haze of the release sheet from the haze.

Furthermore, an adhesive sheet (adhesive layer + peeling sheet) used in the examples and comparative examples was attached to the writing touch-improving layer of the laminated body, and the haze including the adhesive sheet was measured. Then, the haze of the pressure-sensitive adhesive sheet and the haze of the release sheet were subtracted from the haze to calculate the internal haze.

[Test example 3] (Smoothness test of pen)

The touch panels manufactured in the examples and comparative examples were placed on a glass substrate with the writing-touch-improving layer side facing up. On the surface of the writing touch-improving layer, a stylus pen (made by Wacom Corporation, trade name "ACK-2003") with a pen tip diameter of 0.5 mm was applied to the pen tip under a load condition of 3.92 N in a vertical direction. The direction (the axis of the pen tip is perpendicular to the surface of the writing-touch-enhancing layer) makes it contact, and at the same time, it moves at a speed of 100 mm / min in any direction parallel to the surface of the writing-touch-enhancing layer. In addition, the above-mentioned stylus pen is mounted on a measurement-dedicated cart, and by moving the cart, the stylus pen slides on the writing touch-sensing enhancement layer.

The nib resistance at the time of movement was measured using a universal testing machine (manufactured by Orientec, trade name "Tensilon") to obtain a graph of movement distance (mm)-nib resistance (mN). Then, the obtained moving distance (mm) -pen tip resistance (mN) graph was Fourier-transformed by software (manufactured by Microsoft Corporation, software name "Excel") to obtain a frequency (Hz) -amplitude (1) graph. From this frequency (Hz) -amplitude (1) graph, the average value, maximum value (maximum amplitude value), and peak number (amplitude number) of the amplitude in the frequency range of 1 to 2 Hz were obtained. The results are shown in Table 2.

[Test Example 4] (Sensory Evaluation of Writing Touch)

The touch panels manufactured in the examples and comparative examples were placed on a glass substrate with the writing-touch-improving layer side facing up. On the surface of the writing touch-improving layer, the panelist etched the nib of the stylus pen (manufactured by Wacom, trade name "ACK-2003") with a pen tip diameter of 0.5 mm and slid it to evaluate writing. Touch.

For evaluation, use a pencil (manufactured by Mitsubishi Pencil Co., Ltd., trade name "Mitsubishi Pencil Uni B") with 5 sheets of paper (manufactured by Kokuyo S & T, trade name "Campus note A line no-201A"), and press the When writing at 400g, the writing touch is used as a reference. Those who are close to the writing touch are rated as good, and those who are far away from the writing touch are rated as bad. And the evaluation was performed by 3 reviewers, 3 persons who felt good were rated as ◎, 1 to 2 persons felt good as ○, and 3 persons who felt bad as ×. The results are shown in Table 2.

[Test Example 5] (Evaluation of Glare)

The display module (tablet terminal) in the touch panel manufactured in the examples and comparative examples fully displays green (RGB values (R, G, B) = 0, 128, 0), and is performed visually based on the following criteria Evaluation of glare. The results are shown in Table 2.

：: No glare was confirmed.

○: Slight glare was confirmed, but glare was not reached to a practically problematic level.

×: Glare was confirmed.

[Test Example 6] (Evaluation of Display Visibility)

The display module (tablet terminal) in the touch panel manufactured in the examples and comparative examples fully displays green (RGB values (R, G, B) = 0, 128, 0), and is performed visually based on the following criteria The evaluation of the visibility of the image is displayed. The results are shown in Table 2.

：: It was confirmed that the visibility of the displayed image was not lowered.

(Circle): It is confirmed that the visibility (image fading, image blur, etc.) of a displayed image is slightly reduced (not reaching a practical problem).

×: It is confirmed that the visibility of the displayed image is reduced (fading, blurring of the image, etc.).

It is clear from Table 2 that the touch panel manufactured in the embodiment can suppress glare, has good visibility of the displayed image, and has a good writing touch when using a stylus.

(Industrial availability)

The image display device with a position detection function according to the present invention is suitable as a touch panel with excellent writing touch and easy visibility.

Claims (7)

    An image display device with a position detection function is characterized in that it includes at least: a writing touch enhancement layer contacted by a stylus; a display body module having a color filter film; and the writing touch enhancement layer and The light diffusion layer at any position between the display body modules; the total haze from the writing touch improvement layer to the light diffusion layer is 12% or more and 45% or less, the light diffusion layer and the color filter film The distance is 4mm or less.         The image display device having a position detection function according to item 1 of the scope of the patent application, wherein the image display device having a position detection function is provided with a base film, and the writing touch improvement layer may be provided on the side of the base film. Face side.         The image display device with a position detection function as described in item 1 of the scope of the patent application, wherein, for the surface contacted by the stylus of the writing touch-sensing enhancement layer, a stylus with a stylus tip diameter of 0.5 mm is used. The pen tip was brought into contact in a vertical direction under a pressure of 3.92 N, and the pen tip was moved at a speed of 100 mm / minute in any direction parallel to the surface of the writing touch-sensing layer, and the pen tip resistance was measured. The obtained moving distance-tip resistance graph is Fourier transformed, and the average value of the amplitude in the frequency range of 1 to 2 Hz obtained from the frequency-amplitude graph obtained from the conversion is 1.0 or more and 10 or less. It is 4 or more and 30 or less.         The image display device having a position detection function according to item 1 of the scope of the patent application, wherein the writing touch improvement layer is a layer formed by curing a coating composition containing a hardening component and fine particles.         The image display device having a position detection function according to item 1 of the scope of patent application, wherein the light diffusion layer is a layer formed of an adhesive composition containing an adhesive component and light diffusion fine particles.         The image display device having a position detection function according to item 1 of the scope of the patent application, wherein the light diffusion layer is provided adjacent to the display body module.         The image display device having a position detection function according to item 2 of the scope of the patent application, wherein the light diffusing layer is provided adjacent to the base film provided with the writing-touch-improving layer.