TWI635309B - Display device with touch panel - Google Patents

Abstract

The present invention provides a display device with a touch panel that can make the interference fringes generated when the image display surface is strongly invisible and can suppress glare.

According to the same aspect of the present invention, a display device (10) with a touch panel is provided, which is provided with a display panel (20) for displaying an image and a touch device disposed on the viewer side of the display panel (20). A display device (10) with a touch panel of the panel (40), wherein the display panel (20) and the touch panel (40) are disposed with a gap (11) disposed on the touch panel of the display panel (20) ( 40) an optical film (29) is provided on at least one surface of the surface (20A) on the side and the surface (40A) on the display panel (20) side of the touch panel (40), and the optical film (29) is sequentially provided a first light-transmitting substrate (30), an uneven layer (31) having an uneven surface laminated on the first light-transmitting substrate (30), and the uneven surface of the uneven layer (31) being gapped (11) The side of the optical film (29) has an internal haze value of 1% or more and 30% or less, and the average inclination angle θa of the surface of the optical film (29) is 0.074° or more and 2.000° or less.

Description

Display device with touch panel

The present invention relates to a display device with a touch panel.

In the past, a display device with a touch panel on which a touch panel is disposed on a display panel such as a liquid crystal display has been known. In the display device with the touch panel, information can be directly input by touching the image display surface with a finger.

When the touch panel is fixed to the display panel, the display panel is mostly spaced apart from the touch panel, that is, the display panel and the touch panel are mostly disposed with an air gap (air layer) (refer to, for example, Patent Document 1). .

[Previous Technical Literature] [Patent Document 1]

[Patent Document 1] Japanese Patent Laid-Open Publication No. 2010-15412

The image display surface of the display device with the touch panel is not only in the degree of touching with a finger but also strongly pressed by a finger. When the image display surface is strongly pressed, the distance between the touch panel and the display panel is narrowed due to the deformation of the touch panel (the thickness of the air layer is thinned), and the light reflected on the surface of the display panel side of the touch panel is lighted. Interference with light reflected from the surface of the touch panel side of the display panel, and interference between the generation of interference fringes (also known as Newton's rings or water ripples).

On the other hand, in recent years, display devices with touch panels have progressed toward thinner and larger areas. As the display device with the touch panel progresses toward thinning, the distance between the touch panel and the display panel becomes narrower, and as the display device with the touch panel advances toward a large area, the touch panel It becomes easy to deform. Therefore, there is a possibility that the above problem of interference fringes becomes remarkable.

Furthermore, with the popularization of smart phones or tablet PCs, a capacitive touch panel suitable for giving a multi-touch function has been widely used. In addition, in recent years, smart phones or tablet PCs have rapidly progressed toward high definition in order to improve display quality, causing problems due to glare caused by the uneven shape of an optical film provided to prevent interference fringes as described above. Become remarkable. Based on these backgrounds, when a capacitive touch panel is used, not only the above-mentioned interference fringe problem but also glare prevention is required.

The present invention has been made to solve the above problems. That is, the object is to provide a touch panel which can make the interference fringes generated when the image display surface is strongly invisible and can suppress glare.

According to the state of the present invention, there is provided a display device with a touch panel, which is provided with a touch panel having a display panel for displaying an image and a touch panel disposed on the viewer side of the display panel. The display device, wherein the display panel and the touch panel are disposed with a gap therebetween, on at least one surface of the surface of the display panel on the touch panel side and the surface of the touch panel on the display panel side An optical film comprising a first light-transmitting substrate and an uneven layer having an uneven surface laminated on the first light-transmitting substrate, wherein the uneven surface of the uneven layer is a gap In the side arrangement, the optical film has an internal haze value of 1% or more and 30% or less, and the average inclination angle θa of the surface of the optical film is 0.074° or more and 2.000° or less.

The display device with a touch panel according to the present invention is provided with an optical film on at least one surface of the surface of the touch panel side of the display panel and the surface of the display panel side of the touch panel. The internal haze value is 1% or more and 30% or less, and the average inclination angle θa of the surface of the optical film is 0.074° or more and 2.000° or less, so that the interference fringes generated when the image display surface is strongly pressed can be reduced, and the interference fringe can be effectively Suppress glare.

10, 110, 210, 310‧‧‧ display device with touch panel

10A, 110A, 210A, 310A‧‧‧ image display surface

11, 111, 211, 311 ‧ ‧ gap

20‧‧‧ display panel

20A‧‧‧ Surface of the touch panel side of the display panel

21‧‧‧Protective film

22‧‧‧Polarized components

23‧‧‧ phase difference film

24‧‧‧Transparent adhesive layer

25‧‧‧Display components

26‧‧‧Transparent adhesive layer

27‧‧‧ phase difference film

28‧‧‧Polarized components

29‧‧‧Optical film

29A‧‧‧ Surface of optical film

30‧‧‧1st light transmissive substrate

31‧‧‧Uneven layer

32‧‧‧Low refractive index layer

40‧‧‧ touch panel

40A‧‧‧ Surface of the display panel side of the touch panel

41‧‧‧Transparent adhesive layer

42‧‧‧Transparent adhesive layer

50‧‧‧Sense Department

51‧‧‧Substrate film

52‧‧‧ patterned conductive layer

53‧‧‧ patterned conductive layer

54‧‧‧Transparent adhesive layer

55‧‧‧Light transmissive substrate

56‧‧‧hard coating

57‧‧‧High refractive index layer

58‧‧‧Low refractive index layer

59‧‧‧hard coating

60‧‧‧Anti-reflective film

60A‧‧‧Anti-reflective film surface

61‧‧‧2nd light transmissive substrate

62‧‧‧hard coating

63‧‧‧Anti-reflective layer

64‧‧‧High refractive index layer

65‧‧‧Low refractive index layer

70‧‧‧ Covering glass

80‧‧‧Backlight unit

103~106‧‧‧Red light

R1, R2‧‧‧ bright line

Fig. 1 is a schematic configuration diagram of a display device with a touch panel according to a first embodiment.

Fig. 2 is a view for explaining a method of measuring the average tilt angle θa.

Fig. 3 is a view for determining the inclination angle θ ₁ of the interference fringes which are not easily recognized by the human eye.

4 is a schematic configuration diagram of a display device with a touch panel according to a second embodiment.

Fig. 5 is a schematic configuration diagram of a display device with a touch panel according to a third embodiment.

Fig. 6 is a schematic configuration diagram of a display device with a touch panel according to a fourth embodiment.

[First Embodiment]

Hereinafter, a display device with a touch panel according to an embodiment of the present invention will be described with reference to the drawings. In the present specification, the "film" also includes members called "sheets" or "plates". In the present specification, the "weight average molecular weight" is a value obtained by polystyrene conversion by a conventional gel permeation chromatography (GPC) method, which is dissolved in a solvent such as tetrahydrofuran (THF). Fig. 1 is a schematic configuration diagram of a display device with a touch panel according to a first embodiment. In addition, in this specification, "the surface of an optical film" It means the surface of the uneven layer side (the side of the low refractive index layer when the low refractive index layer is present).

[Display device with touch panel]

As shown in FIG. 1 , the display device 10 with a touch panel mainly includes a display panel 20 for displaying an image, a touch panel 40 disposed closer to the viewer than the display panel 20 , and a rear surface disposed on the display panel 20 . The backlight unit 80 on the side. In the present embodiment, the display panel 20 is a liquid crystal display panel. Therefore, the display device 10 with a touch panel includes the backlight unit 80. However, depending on the type of the display panel (display element), the backlight unit 80 may not be provided. The display panel 20 and the touch panel 40 are disposed with a gap 11 such as an air gap. The surface of the display panel 20 on the side of the touch panel 40 is provided with an optical film 29, and the surface of the touch panel 40 on the side of the display panel 20 is not provided with an optical film or an anti-reflection film.

[display panel]

As shown in FIG. 1, the display panel 20 has a protective film 21 such as a triacetyl cellulose film (TAC film) laminated from the backlight unit 80 side toward the viewer side, a polarizing element 22, a retardation film 23, and a transparent adhesive layer. The structure of the layer 24, the display element 25, the transparent adhesive layer 26, the retardation film 27, and the polarizing element 28. The display panel 20 may have at least the display element 25, and may not include the protective film 21 or the like.

The retardation films 23 and 27 are exemplified by a triethylenesulfonated cellulose film or a cycloolefin polymer film. The retardation film 27 can also be the same as the protective film 21. The transparent adhesive constituting the transparent adhesive layers 24, 26 is enumerated as a feeling Pressure adhesive (PSA).

The display element 25 is a liquid crystal display element. However, the display element is not limited to the liquid crystal display element, and may be, for example, an organic EL display element. When the display element is an organic EL display element, a polarizing element or a retardation film may not be provided. The liquid crystal display element is such that a liquid crystal layer, an alignment film, an electrode layer, a color filter, and the like are disposed between two glass substrates.

The resolution of the display panel 20 is not particularly limited, and a high-definition display panel having a resolution of 140 ppi or more and 350 ppi or less is preferably used. In particular, since the optical film of the present invention has a high internal haze value, even when combined with the high-definition display element, the interference fringes can be effectively prevented while the glare is effectively suppressed.

[Optical film]

The optical film 29 has a structure in which the first light transmissive substrate 30 and the uneven layer 31 having the uneven surface and the low refractive index layer 32 are sequentially laminated, but the low refractive index layer 32 may not be provided. Further, the surface 29A of the optical film 29 is an uneven surface.

The optical film 29 is provided on the surface of the touch panel 40 side of the display panel 20, and is disposed on the surface 40A of the touch panel 40 on the display panel 20 side with a gap 11 interposed therebetween. The optical film 29 is disposed such that the uneven surface of the uneven layer 31 is on the side of the gap 11 . The gap is usually an air gap (air layer), but it may be a gap formed by other gases instead of air. The interval d between the surface 29A of the optical film 29 shown in FIG. 1 and the surface 40A of the display panel 20 side of the touch panel 40 is based on the touch The viewpoint of thinning the display device of the control panel is preferably 50 μm or more and 1000 μm or less. This interval d is an interval in which the observer's finger or the like does not contact the image display surface 10A.

In the optical film 29, the average inclination angle θa of the surface 29A of the optical film 29 is 0.074° or more and 2.000° or less. The definition of the average inclination angle θa is based on the surface roughness tester: SE-3400/Otaru Research Institute's operating instructions (revised 1995.07.20). Specifically, as shown in FIG. 2, the convex portion heights h ₁ , h ₂ , ..., h _n existing in the reference length L are expressed by the following formula (1).

θ a=tan ^-1 {(h ₁ +h ₂ +h ₃ +‧‧‧+h _n )/L}...(1)

By adjusting the average tilt angle θa of the surface 29A of the optical film 29 to 0.074° or more, the interference fringes can be effectively prevented from being visible. Further, from the viewpoint of making the interference fringes less visible, the lower limit of the average tilt angle θa is preferably 0.11° or more, more preferably 0.12° or more. Further, by setting the average tilt angle θa to 2.000° or less, glare can be suppressed. The upper limit of the average inclination angle θa is preferably 1.9 or less, more preferably 1.5 or less. Although it is not limited by the theory, the reason why the interference fringes are not visible by setting the lower limit of the average inclination angle θa of the surface 29A of the optical film 29 to the above range is considered as follows.

First, when the distance between the interference fringes is narrower than the decomposition energy of the human eye, the gap is too narrow to be recognized by the interference fringes (Newton's rings). Accordingly, in order to make the interference fringes unrecognizable by the human eye, the distance between the interference fringes needs to be made. Narrower than the decomposition of the human eye. Here, when the light and dark are changed into a rectangular shape, the human eye decomposition power of the visual acuity 1 is 1 minute. Therefore, when the bright viewing distance is 25 cm, the human eye can detect the light and dark stripes of the 70 μm pitch. However, when the light and dark are not rectangular, when there is a gradation change, it is known that the sensitivity detectable by the human eye is reduced from several times to several tens of times. Since the interference fringes are those having a gradation change, even if the distance between the interference fringes (bright lines) is 300 μm, it is considered that the interference fringes are unrecognizable to the human eye. Therefore, it is considered that if the distance between the interference fringes is less than 300 μm, the interference fringes are unrecognizable to the human eye.

On the other hand, as shown in FIG. 3, for example, when the gap 101 is formed on the first layer 100 having the uneven surface 100A, the inclination angle formed by the uneven surface 100A of the first layer 100 is θ ₁ so that The red lights 103 and 104 reflected on the surface of the second layer 102 are strongly combined with the red lights 105 and 106 reflected by the uneven surface 100A of the first layer 100 to cause interference, and it is assumed that the bright lines R1 and R2 of the red light are generated at the pitch A ( When the bright line of red light is hereinafter referred to as "red bright line", based on the above theory, if the gap A is less than 300 μm, the interference fringe of the red bright line is unrecognizable to the human eye. Therefore, in Fig. 3 below, the inclination angle θ ₁ when the pitch A is 300 μm is obtained. Moreover, since the bright line of blue light or green light is generated by a narrower distance between the bright lines than the red light, if the bright line of red light cannot be recognized, even if a bright line of blue light or green light is generated, The eye is still unrecognizable. Further, the first layer 100 shown in FIG. 3 is a part of the first layer 100 which is greatly enlarged.

First, in the triangle formed by the distance A (300 μm) shown in Fig. 3 as the base and the distance B and the height, the following formula (2) holds.

Tan θ ₁ =B/A=B/300...(2)

The distance B in the formula (2) is not an optical distance but an actual distance.

Further, when the optical path difference between the red light 104 and the red light 105 is b, the distance B can be expressed by the following formula (3).

B=b/2...(3)

Here, since the red bright line R1 is adjacent to the red bright line R2, and the red light 105 and the red light 103, the red light 106 and the red light 104 are strongly combined to cause interference, one wavelength of the red light is set to 0.78. At μm (780 nm), the optical path difference b becomes one of the wavelengths of red light, that is, 0.78 μm.

Substituting 0.78 μm into the optical path difference b of the formula (3), and substituting the formula (3) into B of the formula (2), the following formula (4) is obtained.

Tan θ ₁ =0.78/(2×300)...(4)

Further, when equation (4) is released for θ ₁ , the following formula (5) is obtained.

θ ₁ =tan ^-1 (0.0013)=0.074...(5)

Therefore, if the inclination angle θ _{1 is} larger than 0.074, that is, if the inclination angle θ satisfying the relationship of the following formula (6), the light reflected on the surface of the second layer 102 and the uneven surface of the first layer 100 The 100A reflected light interferes to produce interference fringes, and it can still be said that the human eye cannot recognize the interference fringes.

θ ₁ >0.074...(6)

Preferably, since the interference fringe cannot be recognized because the pitch A is 200 μm, the following formula (7) obtained by setting the above A to 200 is satisfied.

θ ₁ >0.11...(7)

In the optical film 29, the internal haze value is set to be 1% or more and 30% or less. The internal haze value herein refers to the haze value due to the internal diffusion of the film due to the composition of the film. That is, the internal haze value is a haze value excluding the influence of the diffusion caused by the uneven shape of the film surface. Although it is not limited by the theory, since the internal diffusion is a diffusion having a large spread, it is considered to have an effect of suppressing the change in luminance (glare) by adjusting the internal haze value of the optical film 29 to 1% or more. Further, the lower limit of the internal haze value is preferably 1.5% or more, more preferably 1.9% or more, from the viewpoint of effectively suppressing glare. Further, by setting the internal haze value to 30% or less, it is possible to suppress a decrease in contrast and visibility. The upper limit of the internal haze value is preferably 27% or less, more preferably 20% or less.

The internal haze value of the optical film was determined as follows. A resin such as pentaerythritol triacrylate (including a resin component such as a monomer or an oligomer) is diluted with toluene or the like to have a solid content of 60% so that the dry film thickness becomes The 8 μm method was applied to the unevenness of the uneven layer by a wire bar. Thereby, the surface unevenness of the uneven layer is broken and becomes a flat layer. However, by adding a leveling agent or the like to the composition for forming the uneven layer, it is easy to repel the recoating agent without being easily wetted, first by saponifying the optical film (immersing 2 mol/l at 55 degrees) After the NaOH (or KOH) solution was washed for 3 minutes, the water was completely removed by a face paper, and then dried in an oven at 50 degrees for 1 minute, and subjected to a hydrophilic treatment. The film having the flat surface does not have a haze due to surface unevenness, and has a state of having only internal haze. Therefore, the haze can be obtained as the internal haze. Next, the value obtained by subtracting the internal haze from the haze (total haze) of the original film was determined as the haze (external haze) caused only by the surface unevenness. Further, the internal haze value and the total haze value can be measured by, for example, a haze meter such as HM-150 manufactured by Murakami Color Research Laboratory in accordance with JIS K7136.

The lower limit of the total haze value of the optical film 29 is preferably 1.6% or more, more preferably 2.0% or more. Further, the upper limit of the total haze value is preferably 41% or less, more preferably 38% or less.

The arithmetic mean roughness Ra of the surface 29A of the optical film 29 is preferably from 0.03 μm to 0.30 μm, and the ten-point average roughness Rz is preferably from 0.10 μm to 1.50 μm. Also, the definitions of "Ra" and "Rz" are based on JIS B0601-1994, respectively.

The average inclination angle θa of the concavities and convexities present in the surface 29A of the optical film 29, and the arithmetic mean roughness Ra and the ten-point average roughness Rz of the film surface can be, for example, using a surface roughness measuring device (Model: SE-3400/small 坂Institute (stock) system, measured by the following measurement conditions The value.

1) The stylus of the surface roughness detecting unit (trade name SE2555N (2μ standard) manufactured by Otaru Research Institute Co., Ltd.)

. Tip radius of curvature 2μm, apex angle 90 degrees, material diamond

2) Measurement conditions of the surface roughness measuring device

. Base length (cutoff value of thick curve λc): 0.25mm

. Evaluation length (reference length (cutoff value λc) × 5): 1.25 mm

. Traveling speed of the stylus: 0.1mm/s

. Preliminary length: (cutoff value λc) × 2

. Vertical magnification: 2000 times

. Horizontal magnification: 10 times

The reflectance Y value measured from the surface 29A side of the optical film 29 is preferably 2.5% or less. The above-mentioned reflection Y value is more preferably 1.5% or less, and still more preferably 1.0% or less, from the viewpoint of making the interference fringes less visible.

The reflection Y value is measured in accordance with JIS Z8722. For the reflection Y value, for example, a spectrophotometer such as MPC3100 manufactured by Shimadzu Corporation is used, and light having an incident angle of 8 degrees is irradiated from the surface side of the optical film, and the reflected light including the diffused light reflected from the optical film is received by the integrating sphere. The whiteboard with the BaSO ₄ powder is used as a reference to measure the reflectance in the wavelength range of 380 nm to 780 nm, and then to convert the softness of the adult eye (for example, the software built in the MPC3100) to "C light source, field of view 2" The condition of "degree" is calculated. In the present specification, the term "light having an incident angle of 8 degrees" means light that is inclined by 8 degrees with respect to the normal direction when the normal direction of the film surface of the optical film is 0 degrees. The "film surface" can be said to be the same as the plane direction of the target optical film when viewed from a large area. Further, when the reflection Y value is measured, in order to prevent back reflection of the optical film, it is preferred to apply a black tape to the surface of the light-transmitting substrate opposite to the surface on which the uneven layer is formed.

The optical film 29 having a reflection Y value of less than 2.5% can be mainly obtained by adjusting the composition of the uneven layer 31 and/or the low refractive index layer 32 laminated on the uneven layer 31.

The total light transmittance of the optical film 29 is preferably 85% or more. When the total light transmittance is 85% or more, when the optical film 29 is attached to the surface of the image display device, color reproducibility and visibility can be further improved. The total light transmittance is preferably 90% or more. The total light transmittance can be measured by a haze meter (manufactured by Murakami Color Research Laboratory, product model: HM-150) in accordance with the method of JIS K7361.

In the optical film 29, the sum of the transmission images of the four kinds of optical combs of 0.125 mm wide, 0.5 mm wide, 1.0 mm wide, and 2.0 mm wide is preferably 20% to 380%, more preferably 100% to 320%. . The image sharpness can be measured by a transmission intensity measuring device according to the image transparency method of JIS K7105. Such a measuring device is exemplified by an image sharpness measuring device (ICM-1T, manufactured by SUGA Testing Machine Co., Ltd.).

The optical film 29 includes the first light-transmitting substrate 30 and the uneven layer 31 laminated on the first light-transmitting substrate 30, and preferably further has a lower refractive index than the uneven layer 31 on the uneven layer 31. Refractive index layer 32. By providing the low refractive index layer 32, the advantageous effect of improving the visibility (transmittance) of the optical film 29 is exhibited. The low refractive index layer 32 can For example, a low refractive index layer having a refractive index of 1.45 or less is used. Hereinafter, the constituent elements of the optical film 29 will be described.

<First Light Transmissive Substrate>

The first light-transmitting substrate 30 is not particularly limited as long as it has light permeability, and examples thereof include a cellulose halide substrate, a cycloolefin polymer substrate, a polycarbonate substrate, an acrylic substrate, and a polyester group. Material, or glass substrate.

The cellulose halide substrate is exemplified by, for example, a triacetyl cellulose substrate and a diethyl fluorene cellulose substrate. The triethylenesulfonyl cellulose substrate is a substrate having an average light transmittance of 50% or more in the visible light region of 380 to 780 nm. The triethylene fluorene-based cellulose substrate has an average light transmittance of 70% or more, more preferably 85% or more.

Further, the triethyl fluorene-based cellulose substrate may be used in combination with cellulose such as cellulose acetate propionate or cellulose acetate butyrate in addition to pure triethyl fluorenyl cellulose. A component other than acetic acid of fatty acid. Further, in the triethyl fluorene-based cellulose, other cellulose lower fatty acid esters such as diethyl fluorenyl cellulose or various additives such as a plasticizer, an ultraviolet absorber, and a slip agent may be added as needed.

The cycloolefin polymer substrate is exemplified by a substrate made of a polymer such as a norbornene-based monomer or a monocyclic cycloolefin monomer.

The polycarbonate substrate is exemplified by an aromatic polycarbonate substrate based on bisphenols (such as bisphenol A) or an aliphatic polycarbonate substrate such as diethylene glycol bisallyl carbonate. .

The acrylate-based polymer substrate is exemplified by, for example, a poly(methyl) methacrylate substrate, a poly(ethyl) acrylate substrate, and a methyl (meth) acrylate-butyl (meth) acrylate copolymer. Materials and so on.

The polyester substrate is exemplified by, for example, at least one of polyethylene terephthalate, polytrimethylene terephthalate, polybutylene terephthalate, and polyethylene naphthalate as a constituent component. Materials and so on.

The glass substrate is exemplified by a glass substrate such as soda lime cerium oxide glass, borosilicate glass, or alkali-free glass.

Among these, an acrylic base material is preferable from the viewpoint of the following. Although a polarizing element is provided on the surface of the first light-transmitting substrate 30 on the display element side, the polarizing element has a enthalpy of eluting iodine contained in the polarizing element due to moisture. Therefore, in order to suppress iodine elution in the polarizing element, the first light-transmitting substrate 30 is preferably an acrylic substrate having a low water permeability.

The thickness of the first light-transmitting substrate 30 is not particularly limited, but may be 5 μm or more and 100 μm or less. The lower limit of the thickness of the first light-transmitting substrate 30 is preferably 15 μm or more from the viewpoint of handleability, etc., more preferably 25 μm or more. The upper limit of the thickness of the first light transmissive substrate 30 is preferably 80 μm or less from the viewpoint of film formation.

<concave layer>

The uneven layer 31 has an uneven surface on the surface opposite to the surface on the side of the first light-transmitting substrate 30. The uneven layer 31 mainly serves to impart an interference fringe preventing function to the surface 29A of the optical film 29 due to the unevenness.

The uneven layer 31 can impart any other function than the interference fringe prevention. An example thereof is a function of imparting hard coat properties, antistatic properties, or antifouling properties. Here, the "hard coating property" is a property necessary for improving the scratch resistance of an optical film, and specifically refers to a pencil hardness test (4.9 N load) prescribed in JIS K5600-5-4 (1999). ) is the hardness above "H".

The thickness of the uneven layer 31 is preferably 2.0 μm or more and 7.0 μm or less. When the thickness of the uneven layer 31 is within this range, when the uneven layer has a hard coat layer, the uneven layer can be made thinner and a sufficient hardness can be imparted to the uneven layer 31. By achieving sufficient film formation of the uneven layer 31, cracking or curling of the uneven layer can be suppressed. Further, the thickness of the uneven layer 31 can be measured by a cross-sectional microscope observation. The lower limit of the thickness of the uneven layer 31 is more preferably 3 μm or more, and the upper limit is more preferably 5 μm or less.

The uneven layer 31 can be formed by, for example, the following method: (1) a method of applying a composition for an uneven layer containing fine particles and a photopolymerizable compound which is a binder resin after polymerization to a light-transmitting substrate, (2) a method in which a composition for a concavo-convex layer is applied onto a light-transmitting substrate, and then a mold having a groove having an opposite surface of the uneven surface is molded on the composition for the uneven layer, or (3) a light is transmitted through The method of coating the surface of the uneven layer with the disk-shaped particles in which the disk-shaped particles having the uneven shape of the uneven surface are dispersed on the surface, and the disk-like particles are arranged on the surface of the uneven layer. Among these, in terms of ease of manufacture, the method of (1) is preferred.

In the method of the above (1), when the photopolymerizable compound is polymerized (crosslinked) to form a binder resin, a part of the fine particles is not caused. The photopolymerizable compound hardens and shrinks and shrinks the whole. On the other hand, in the case where the fine particles are present, since the fine particles do not cause hardening and shrinkage, the photopolymerizable compound present only on the upper and lower sides of the fine particles causes hardening and shrinkage. According to this, the portion of the fine particles is thicker than the portion where the fine particles are not present, and the surface of the uneven layer is formed into a concave-convex shape. Therefore, by selecting the type of the fine particles, the particle diameter, and the kind of the photopolymerizable compound, the coating film forming conditions can be adjusted, and the parameters (average tilt angle θa, etc.) of the surface of the optical film can be adjusted.

Hereinafter, the uneven layer will be described for an example including fine particles and a binder resin. For example, the uneven layer containing the fine particles and the binder resin can be formed by the method of the above (1).

(microparticles)

The fine particles may be either inorganic fine particles or organic fine particles, and may be used in combination with inorganic fine particles and organic fine particles. The internal haze of the optical film can be appropriately adjusted by adjusting the type and content of the fine particles. The inorganic fine particles are preferably inorganic oxide fine particles such as cerium oxide (SiO ₂ ) fine particles, alumina fine particles, titanium oxide fine particles, tin oxide fine particles, cerium-doped tin oxide (abbreviation: ATO) fine particles, and zinc oxide fine particles. The inorganic oxide fine particles can form an aggregate in the uneven layer, and a suitable uneven surface can be formed by adjusting the degree of aggregation of the aggregate.

The organic fine particles are preferably composed of an acrylic resin, a polystyrene resin, a styrene-acrylic copolymer resin, a polyethylene resin, an epoxy resin, a polyoxynoxy resin, a polyvinylidene fluoride resin, and a polyvinyl fluoride resin. A group of particles selected from at least one of the materials. Among them, Styrene-acrylic copolymer microparticles are suitable.

In the above hardening shrinkage, the organic fine particles are preferably moderately adjusted to have resistance to hardening shrinkage of the fine particles. When the resistance to the shrinkage is adjusted, it is preferable to change the degree of cross-linking of the three-dimensional cross-linking in advance, and to form a plurality of optical films containing organic fine particles having different hardnesses, and it is preferably selected by evaluating the irregularities existing on the surface of the optical film. The degree of crosslinking of the preferred uneven surface is formed.

When inorganic oxide particles are used as the fine particles, the inorganic oxide particles are preferably subjected to surface treatment. By subjecting the inorganic oxide fine particles to a surface treatment, the distribution of the fine particles in the uneven layer 31 can be preferably controlled, and the chemical resistance and alkali resistance of the fine particles themselves can be improved.

As for the surface treatment, it is preferred to hydrophobize the surface of the fine particles to be hydrophobic. This hydrophobization treatment can be obtained by chemically reacting the surface of the fine particles with a surface treatment agent such as a decane or a decane. Specific surface treatment agents are exemplified by, for example, dimethyldichlorodecane or polyoxalate, hexamethyldioxane, octyldecane, cetyldecane, aminodecane, methacrylonitrile, and octa Methylcyclotetraoxane, polydimethyloxane, and the like. When the fine particles are inorganic oxide fine particles, the surface of the inorganic oxide fine particles has a hydroxyl group. However, by applying the hydrophobization treatment as described above, the hydroxyl groups present on the surface of the inorganic oxide fine particles are reduced, and the inorganic oxide fine particles can be used. The specific surface area measured by the BET method is small, and at the same time, excessive aggregation of the inorganic oxide fine particles can be suppressed, and an uneven layer having a moderate uneven surface can be formed.

When inorganic oxide particles are used as the fine particles, the inorganic oxide fine particles are preferably amorphous. The reason is that the inorganic oxide particles are In the case of crystallinity, the Lewis acid base of the inorganic oxide fine particles is strengthened by the lattice defects contained in the crystal structure, and there is no possibility of controlling excessive aggregation of the inorganic oxide fine particles.

When inorganic oxide particles are used as the fine particles, the inorganic oxide fine particles preferably form aggregates in the uneven layer 31. The aggregate of the inorganic oxide fine particles preferably has a structure in which the inorganic oxide fine particles are connected three-dimensionally in the uneven layer 31. The structure in which the inorganic oxide fine particles are three-dimensionally linked is exemplified by a cage shape or a curl shape. When the photopolymerizable compound having a structure in which the inorganic oxide fine particles are three-dimensionally bonded is hardened and contracted by the photopolymerizable compound which becomes a binder resin after curing, it is easy and has a uniform collapse. According to this, the uneven surface can be made into a very smooth surface, and as a result, the uneven surface having the steep slope can be formed, and the uneven layer having the appropriate uneven surface can be formed. Moreover, even when the organic fine particles as described above are used, if the degree of crosslinking is moderately adjusted, an uneven layer having a moderately uneven surface can be formed.

The content of fine particles in the uneven layer 31 is not particularly limited, but is preferably 0.1% by mass or more and 20.0% by mass or less. Since the fine particle content is 0.1% by mass or more, a moderately uneven surface can be formed more reliably, and since the fine particle content is 20.0% by mass or less, aggregates are not excessively formed, and internal diffusion and/or generation on the surface of the uneven layer can be suppressed. Large unevenness, thereby suppressing the feeling of white turbidity. The lower limit of the content of the fine particles is more preferably 0.5% by mass or more, and the upper limit of the content of the fine particles is more preferably 15.0% by mass or less.

The shape of the microparticles in the single particle state is preferably spherical. When the single particle of the fine particles is in the spherical shape and the optical film is placed on the image display surface of the image display device, an image excellent in contrast can be obtained. Here The term "spherical" means, for example, a true spherical shape, an elliptical spherical shape, or the like, but does not contain a so-called amorphous.

When the inorganic oxide fine particles are used as the fine particles, the average primary particle diameter of the inorganic oxide fine particles is preferably from 1 nm to 100 nm. Since the average primary particle diameter of the fine particles is 1 nm or more, the uneven layer having a moderate uneven surface can be formed more easily, and since the average primary particle diameter is 100 nm or less, the diffusion of light due to the fine particles can be suppressed. Excellent darkroom contrast. The lower limit of the average primary particle diameter of the fine particles is more preferably 5 nm or more, and the upper limit of the average primary particle diameter of the fine particles is more preferably 50 nm or less. Further, the average primary particle diameter of the fine particles is a value measured by an image processing software using an image of a cross-sectional electron microscope (preferably a transmission type such as TEM or STEM, and a magnification of 50,000 times or more).

When the organic fine particles are used as the fine particles, the size of the organic fine particles is appropriately determined depending on the thickness of the uneven layer formed, and the like, for example, the average particle diameter is preferably 1.0 μm or more and 5.0 μm or less. When the thickness is 1.0 μm or more, the dispersibility of the organic fine particles can be favorably controlled. When the thickness is 5.0 μm or less, the uneven shape of the surface of the uneven layer formed is not excessively increased, and the problem of glare is also preferably suppressed. A lower limit is 2.0 μm, and a higher limit is 4.0 μm.

When the inorganic oxide fine particles are used as the fine particles, the average particle diameter of the aggregate of the inorganic oxide fine particles is preferably 100 nm or more and 2.0 μm or less. When the thickness is 100 nm or more, an appropriate uneven surface can be easily formed, and if it is 2.0 μm or less, the diffusion of light due to the aggregate of the fine particles can be suppressed, and an image of an optical film excellent in contrast in the dark room can be obtained. Display device. The lower limit of the average particle diameter of the aggregate of the fine particles is preferably 200 nm or more, and the upper limit is preferably 1.5 μm or less.

The average particle diameter of the aggregate of the inorganic oxide fine particles is determined by a cross-sectional electron microscope (about 10,000 to 20,000 times), and a 5 μm square region of the aggregate containing a large amount of inorganic oxide fine particles is selected and measured in the region. The particle diameter of the aggregate of the inorganic oxide fine particles, and the particle diameter of the aggregate of the largest 10 inorganic oxide fine particles is averaged. In the above-mentioned "particle diameter of the aggregate of the inorganic oxide fine particles", when the cross section of the aggregate of the inorganic oxide fine particles is sandwiched by two parallel straight lines, the distance between the two straight lines is maximized. The distance between straight lines under the combination of straight lines. Further, the particle diameter of the aggregate of the inorganic oxide fine particles can also be calculated using an image analysis software.

When the cerium oxide particles are used as the fine particles, the cerium oxide particles are preferably smear-based cerium oxide microparticles based on the viewpoint that the uneven layer having a moderate uneven surface can be easily formed. The fumed cerium oxide is an amorphous cerium oxide having a particle diameter of 200 nm or less which is produced by a dry method and can be obtained by reacting a volatile compound containing ruthenium in a gas phase. Specifically, for example, a ruthenium compound such as ruthenium tetrachloride (SiCl ₄ ) is hydrolyzed in a flame of oxygen and hydrogen to be produced. Commercially available products of fumed cerium oxide microparticles are listed as AEROSIL R805 manufactured by AEROSIL Co., Ltd., Japan.

Among the smoked cerium oxide microparticles, those which exhibit hydrophilicity and those which exhibit hydrophobicity are preferred. However, in view of the fact that the amount of moisture absorption is small and it is easy to be dispersed in the composition for an uneven layer, good. sparse The aqueous fumed cerium oxide can be obtained by chemically reacting a stanol group present on the surface of the fumed cerium oxide microparticles with a surface treating agent as described above. The fumed silica is preferably treated with octyldecane based on the viewpoint that the agglomerates as described above can be easily obtained.

Although the fumed cerium oxide microparticles form an aggregate, the aggregate of the fumed cerium oxide microparticles is not a dense agglomerate in the composition for the uneven layer, but forms a relatively sparse agglomerate such as a cage or a curl. Therefore, when the aggregate of the fumed cerium oxide microparticles hardens and contracts as a photopolymerizable compound of the binder resin after curing, it is easy to maintain the collapse of uniformity. Thereby, the uneven layer having a moderate uneven surface can be formed.

When organic fine particles and inorganic fine particles are used in combination as the fine particles, it is preferred to use cerium oxide fine particles, particularly fumed cerium oxide as inorganic fine particles.

(Binder resin)

The binder resin is obtained by polymerizing (crosslinking) a photopolymerizable compound by light irradiation. The photopolymerizable compound is one having at least one photopolymerizable functional group. In the present specification, the "photopolymerizable functional group" is a functional group which can be polymerized by light irradiation. The photopolymerizable functional group is exemplified by an ethylenic double bond such as a (meth)acryl fluorenyl group, a vinyl group or an allyl group. Moreover, "(meth)acryloyl group" means both "acryloyl group" and "methacryl fluorenyl group". Further, the light to be irradiated when the photopolymerizable compound is polymerized is exemplified by visible light and ionizing radiation such as ultraviolet rays, X rays, electron beams, α rays, β rays, and γ rays.

The photopolymerizable compound is exemplified by a photopolymerizable monomer, a photopolymerizable oligomer, or a photopolymerizable prepolymer, and can be appropriately adjusted and used. The photopolymerizable compound is preferably a combination of a photopolymerizable monomer and a photopolymerizable oligomer or a photopolymerizable prepolymer.

Photopolymerizable monomer

The photopolymerizable monomer is one in which the weight average molecular weight is less than 1,000. The photopolymerizable monomer is preferably a polyfunctional monomer having two (i.e., bifunctional) or more photopolymerizable functional groups.

The difunctional or higher monomer is exemplified by, for example, trimethylolpropane tri(meth)acrylate, tripropylene glycol di(meth)acrylate, diethylene glycol di(meth)acrylate, dipropylene glycol di(methyl). Acrylate, pentaerythritol tri(meth)acrylate, pentaerythritol tetra(meth)acrylate, dipentaerythritol hexa(meth)acrylate, 1,6-hexanediol di(meth)acrylate, neopentyl Alcohol di(meth)acrylate, trimethylolpropane tri(meth)acrylate, di-trimethylolpropane tetra(meth)acrylate, dipentaerythritol penta(meth)acrylate, tripentaerythritol (Meth) acrylate, pentaerythritol deca (meth) acrylate, isocyanuric acid tri(meth) acrylate, isocyanuric acid di(meth) acrylate, polyester tri(meth) acrylate, poly Ester di(meth)acrylate, bisphenol di(meth)acrylate, diglycerol tetra(meth)acrylate, adamantyl di(meth)acrylate, isobornyl di(methyl) Acrylate, dicyclopentane di(meth)acrylate, tricyclodecane di(meth)acrylate, di-trimethylolpropane tetra(methyl) Acrylate, or enabling the at PO, EO and the like are modified.

Among these, in view of obtaining a textured layer having a high hardness, pentaerythritol triacrylate (PETA), dipentaerythritol hexaacrylate (DPHA), pentaerythritol tetraacrylate (PETTA), dipentaerythritol pentaacrylate (DPPA) are preferred. )Wait.

Photopolymerizable oligomer

The photopolymerizable oligomer is one having a weight average molecular weight of 1,000 or more and less than 10,000.

The photopolymerizable oligomer is preferably a polyfunctional oligomer having two or more functional groups. The polyfunctional oligomers are exemplified by polyester (meth) acrylate, urethane (meth) acrylate, polyester urethane (meth) acrylate, polyether (methyl). Acrylate, polyol (meth) acrylate, melamine (meth) acrylate, isocyanurate (meth) acrylate, epoxy (meth) acrylate, and the like.

Photopolymerizable prepolymer

The photopolymerizable prepolymer is preferably a weight average molecular weight of 10,000 or more, and the weight average molecular weight is preferably 10,000 or more and 80,000 or less, more preferably 10,000 or more and 40,000 or less. When the weight average molecular weight exceeds 80,000, the coating suitability is lowered due to the high viscosity, and the appearance of the obtained optical laminate is deteriorated. The above polyfunctional polymers are exemplified by urethane (meth) acrylate, isocyanurate (meth) acrylate, polyester urethane (meth) acrylate, epoxy ( Methyl) acrylate or the like.

Other ingredients

In the adhesive resin, a solvent-drying resin (a thermoplastic resin or the like which is added only by a solvent added to adjust a solid component during coating to be a resin of a film), and/or a heat hardening may be added as needed. Resin.

When the solvent-drying resin is added, when the uneven layer 31 is formed, the film defect of the coated surface of the coating liquid can be effectively prevented. The solvent-drying type resin is not particularly limited, and a general thermoplastic resin can be used. Examples of the thermoplastic resin include a styrene resin, a (meth)acrylic resin, a vinyl acetate resin, a vinyl ether resin, a halogen-containing resin, an alicyclic olefin resin, and a polycarbonate resin. A polyester resin, a polyamide resin, a cellulose derivative, a polyoxyn resin, a rubber or an elastomer.

The thermoplastic resin is preferably amorphous and soluble in an organic solvent (especially a common solvent which can dissolve a plurality of polymers or hardening compounds). In particular, a styrene resin, a (meth)acrylic resin, an alicyclic olefin resin, a polyester resin, or a cellulose derivative (cellulose ester, etc.) is used from the viewpoint of transparency or weather resistance. And so on.

The thermosetting resin to be added to the binder resin is not particularly limited, and examples thereof include a phenol resin, a urea resin, a diallyl phthalate resin, a melamine resin, a guanamine resin, an unsaturated polyester resin, and a polyamine. A urethane resin, an epoxy resin, an amino alkyd resin, a melamine-urea co-condensation resin, an anthracene resin, a polydecane resin, or the like.

<low refractive index layer>

The optical film 29 further includes a low refractive index layer 32 on the uneven layer 31 having an uneven surface. The low refractive index layer 32 is used to reduce the reflectance of external light (for example, a fluorescent lamp, natural light, or the like) from the surface of the optical film 29. The low refractive index layer 32 may not be provided as an arbitrary layer. However, it is preferable to laminate the low refractive index on the uneven layer to obtain an effect of improving the visibility (transmittance) of the optical film. The low refractive index layer 32 has a lower refractive index than the uneven layer 31. Specifically, for example, the low refractive index layer preferably has a refractive index of 1.43 or less, and more preferably has a refractive index of 1.40 or less.

The thickness of the low refractive index layer 32 is not limited as long as it does not block the unevenness of the uneven layer 31 having the uneven surface, but it is usually set as appropriate within a range of about 30 nm to 1 μm. The thickness d _A (nm) of the low refractive index layer 32 preferably satisfies the following formula (8).

d _A =m λ /(4n _A )...(8)

In the above formula, n _A represents a refractive index of the low refractive index layer, m represents a positive odd number, preferably 1, and λ is a wavelength, and preferably a value in the range of 480 nm or more and 580 nm or less.

The low refractive index layer 32 preferably satisfies the following formula (9) from the viewpoint of low reflectance.

120<n _A d _A <145...(9)

Although the low refractive index layer is a single layer, an effect can be obtained, but for the purpose of adjusting a lower minimum reflectance or a higher minimum reflectance, two or more low refractive index layers may be appropriately provided. When two or more layers of the low refractive index layer are provided, it is preferred to set a difference in refractive index and thickness of each of the low refractive index layers.

The low refractive index layer 32 is preferably composed of one of the following: 1) a resin containing low refractive index particles such as cerium oxide or magnesium fluoride; 2) a fluorine resin having a low refractive index resin, and 3) A film containing a fluorine-based resin such as cerium oxide or magnesium fluoride, or a low refractive index material such as cerium oxide or magnesium fluoride. As the resin other than the fluorine-based resin, the same resin as the binder resin constituting the above-mentioned uneven layer can be used.

Further, the cerium oxide is preferably hollow cerium oxide fine particles, and the hollow cerium oxide fine particles can be produced, for example, by the production method described in the examples of JP-A-2005-099778.

Further, the low refractive index particles contained in the low refractive index layer 32 may be formed in at least a part of the inside and/or the surface depending on the form, structure, aggregation state, and dispersion state of the fine particles inside the coating film. Nanoporous porous structure of particles. Specifically, it is exemplified by an aggregate of porous cerium oxide microparticles (for example, trade name Nipsil or Nipgel manufactured by Nippon Semen Industrial Co., Ltd.) or colloidal cerium oxide (manufactured by Nissan Chemical Industries Co., Ltd.). A colloidal cerium oxide (UP series) having a structure in which cerium oxide microparticles are connected in a chain structure.

As the fluorine-based resin, a polymerizable compound having at least a fluorine atom in the molecule or a polymer thereof can be used. The polymerizable compound is not particularly limited, but is preferably, for example, a photopolymerizable functional group or a heat-curable polar group. The basis of the hardening reactivity. Further, it may be a compound having a group having such reactivity at the same time. The polymerizable compound is a polymer which does not have the above-mentioned reactive group at all.

As the photopolymerizable compound, a fluorine-containing monomer having an ethylenically unsaturated bond can be widely used. More specifically, it can be exemplified as a fluoroolefin (for example, vinyl fluoride, vinylidene fluoride, tetrafluoroethylene, hexafluoropropylene, perfluorobutadiene, perfluoro-2,2-dimethyl-1,3-di Oxeene, etc.). As for the (meth) propylene oxime group, there are also 2,2,2-trifluoroethyl (meth)acrylate and 2,2,3,3,3-pentafluoropropyl (meth)acrylate, ( 2-(perfluorobutyl)ethyl methacrylate, 2-(perfluorohexyl)ethyl (meth) acrylate, 2-(perfluorooctyl)ethyl (meth) acrylate, (methyl) a (meth) acrylate compound having a fluorine atom in a molecule of 2-(perfluorodecyl)ethyl acrylate, α-trifluoromethyl methacrylate or α-trifluoromethyl acrylate; or a molecule a fluoroalkyl group having at least 3 fluorine atoms having 1 to 14 carbon atoms, a fluorocycloalkyl group or a fluorine alkyl group, and a fluorine-containing polyfunctional (meth) group having at least 2 (meth) propylene fluorenyloxy groups Acrylate compound, etc.

The polar group of the above thermosetting is preferably a hydrogen bond forming group such as a hydroxyl group, a carboxyl group, an amine group or an epoxy group. These are excellent not only in adhesion to a coating film but also in affinity with inorganic ultrafine particles such as cerium oxide. The polymerizable compound having a thermosetting polar group is exemplified by, for example, a 4-fluoroethylene-perfluoroalkyl vinyl ether copolymer; a fluoroethylene-hydrocarbon vinyl ether copolymer; an epoxy resin, a polyurethane, A fluorine-modified product of each resin such as cellulose, phenol or polyimine.

Together with the above photopolymerizable functional groups and thermosetting The polymerizable compound of the group may be exemplified as a part of acrylic acid or methacrylic acid and a fully fluorinated alkyl ester, an enester, an aryl ester, a wholly or partially fluorinated vinyl ether, a wholly or partially fluorinated vinyl ester, and completely Or partially fluorinated ketenes and the like.

The fluorine-based resin is exemplified by the following. a polymer of a monomer or a monomer mixture of a fluorine-containing (meth) acrylate compound containing at least one polymerizable compound having an ionizing radiation curable group; at least one of the above fluorine-containing (meth) acrylate compounds And with molecules such as methyl (meth) acrylate, ethyl (meth) acrylate, propyl (meth) acrylate, butyl (meth) acrylate, 2-ethylhexyl (meth) acrylate a copolymer of a fluorine atom-containing (meth) acrylate compound; for example, vinyl fluoride, vinylidene fluoride, trifluoroethylene, chlorotrifluoroethylene, 3,3,3-trifluoropropene, 1,1,2-three A homopolymer or copolymer of a fluorine-containing monomer of chloro-3,3,3-trifluoropropene or hexafluoropropylene. It is also possible to use a polyfluorene-containing vinylidene fluoride copolymer containing a polyoxonium component in the copolymer. The polyoxo component in this case is exemplified by (poly)dimethyloxane, (poly)dimethoxyoxane, (poly)diphenyloxirane, (poly)methylphenyloxyne, Alkyl-modified (poly)dimethyloxane, azo-containing (poly)dimethyloxane, dimethylpolyphosphonium, phenylmethylpolyoxyl, alkyl. Aromatic alkyl modified polyfluorene oxide, fluoropolyfluorene oxide, polyether modified polyfluorene oxide, fatty acid ester modified polyoxo, methyl hydrogen polyoxynium, decyl alcohol-containing polyoxygen, Alkoxy-containing polyfluorene oxide, phenol group-containing polyfluorene oxide, methacrylic acid modified polyfluorene oxide, acrylic acid modified polyfluorene oxide, amine modified polyfluorene oxide, carboxylic acid modified polycondensation Hexaoxy, carbitol modified polyfluorene oxide, epoxy modified polyfluorene oxide, sulfhydryl modified polyfluorene, fluorine Modified polyfluorene, polyether modified polyfluorene and so on. Among these, it is preferred to have a structure of dimethyloxane.

Further, a non-polymer or a polymer obtained from a compound such as the following may be used as the fluorine-based resin. That is, a compound obtained by reacting a fluorine-containing compound having at least one isocyanate group in the molecule with a compound having at least one functional group capable of reacting with an isocyanate group such as an amine group, a hydroxyl group or a carboxyl group in the molecule can be used; A fluoropolyether polyol, a fluorine-containing alkyl polyol, a fluorine-containing polyester polyol, a fluorine-containing polyhydric alcohol of a fluorine-containing ε-caprolactone-modified polyol, a compound obtained by reacting a compound having an isocyanate group, or the like.

Further, it may be used by mixing the above-mentioned binder resin described in the above-mentioned uneven layer 31 with the above-mentioned polymerizable compound having a fluorine atom or a polymer. Further, a curing agent for curing a reactive group or the like, various additives and a solvent for improving coating properties and imparting antifouling properties can be suitably used.

"Methods of Manufacturing Optical Films"

The method of manufacturing the optical film 29 as described above will be described in more detail. In the following description, the uneven layer 31 having the uneven surface is formed by the method of the above (1).

First, the composition for a concavo-convex layer is applied onto the surface of the first light transmissive substrate 30. The method of applying the composition for an uneven layer is exemplified by a spin coating method, a dipping method, a spray method, a slide coating method, a bar coating method, a roll coating method, a gravure coating method, and a die coating method. Coating method.

<Constituent for uneven layer>

The composition for an uneven layer is one containing at least fine particles or a photopolymerizable compound. Moreover, it is also possible to add the above thermoplastic resin, the above-mentioned thermosetting resin, a solvent, and a polymerization initiator to the composition for an uneven layer. Further, in the composition for an uneven layer, a conventionally used dispersant, surfactant, antistatic agent, decane coupling agent, and tackifier may be added for the purpose of improving the hardness of the uneven layer, suppressing the shrinkage and shrinkage, and controlling the refractive index. Anti-colorant, colorant (pigment, dye), antifoaming agent, leveling agent, flame retardant, ultraviolet absorber, adhesion promoter, polymerization inhibitor, antioxidant, surface modifier, slip agent, and the like.

(solvent)

The solvent can be exemplified by, for example, an alcohol (for example, methanol, ethanol, propanol, isopropanol, n-butanol, second butanol, third butanol, benzyl alcohol, PGME, ethylene glycol), ketone (acetone) , methyl ethyl ketone (MEK), cyclohexanone, methyl isobutyl ketone, diacetone alcohol, cycloheptanone, diethyl ketone, etc.), ethers (1,4-dioxane, dioxane Cyclopentane, diisodecyl ether dioxane, tetrahydrofuran, etc.), aliphatic hydrocarbons (hexane, etc.), alicyclic hydrocarbons (cyclohexane, etc.), aromatic hydrocarbons (toluene, xylene, etc.) , halogenated hydrocarbons (dichloromethane, dichloroethane, etc.), esters (methyl formate, methyl acetate, ethyl acetate, propyl acetate, butyl acetate, ethyl lactate, etc.), cellosolve ( Methylfusin, ethyl cellosolve, butyl cellosolve, etc.), cellosolve acetate, sulfonium (dimethyl hydrazine, etc.), guanamine (dimethylformamide, dimethyl Ethyl acetamide, etc., etc., may also be a mixture of these.

When organic fine particles and inorganic fine particles (especially cerium oxide fine particles) are used in combination, it is preferred to contain a solvent having a high polarity and a high volatilization rate. By including such a solvent having a high polarity and a high volatilization rate, it is possible to prevent excessive aggregation of the aggregates of the cerium oxide fine particles in the composition for an uneven layer. Further, when the composition for an uneven layer is applied onto a light-transmitting substrate and dried, the solvent having a high polarity and a high volatilization rate is volatilized before the other solvent, so that the composition in the coating film is denatured. As a result, in the coating film, the aggregate of the cerium oxide microparticles is brought close to the periphery of the organic fine particles, and the aggregates of the cerium oxide microparticles are also brought close to each other, and the aggregate of the cerium oxide microparticles can be formed into a coarse state, and Densely distributed around the organic particles.

The solvent having a high polarity and a high volatilization rate is preferably contained in an amount of 20% by mass or more and 50% by mass or less based on the total amount of the solvent contained in the composition for an uneven layer. In the present specification, the term "solvent having a high polarity" means a solvent having a solubility parameter of 10 [(cal/cm ³ ) ^1/2 ] or more, and the term "solvent having a high volatilization rate" means a relative evaporation rate of 150 or more. Solvent. Accordingly, the term "solvent having a high polarity and a high volatilization rate" means a solvent having sufficient requirements for both the "highly polar solvent" and the "solvent having a high volatilization rate".

In this specification, the solubility parameter is calculated by the method of Fedors. The method of Fedors is described, for example, in "SP Value Basis ‧ Application and Calculation Methods" (Shan Yamasuke, Information Technology Co., Ltd., 2005). In the method of Fedors, the solubility parameter is calculated by the following formula (10).

Solubility parameter = [ΣE _coh /ΣV] ² (10)

Where E _coh is the cohesive energy density and V is the molar molecular volume. Based on the determined E _coh and V of each atomic group, E is obtained and the sum V of the [Sigma] En _{coh coh} and OVT, solubility parameter can be calculated.

In the present specification, the relative evaporation rate means the relative evaporation rate when the evaporation rate of n-butyl acetate is 100, and is the evaporation rate measured in accordance with ASTM D3539-87. This value is calculated by the following formula (11). Specifically, the evaporation time of n-butyl acetate and the evaporation time of each solvent were measured at 25 ° C in dry air.

Relative evaporation rate = (time required for evaporation of n-butyl acetate 90% by weight) / (time required for evaporation of 90% by weight of solvent) × 100 (11)

The solvent having a high polarity and a high volatilization rate is exemplified by, for example, ethanol, isopropyl alcohol or the like, and isopropyl alcohol is preferably used.

(polymerization initiator)

The polymerization initiator is a component which decomposes by light irradiation to generate a radical and initiates or polymerizes (crosslinks) the photopolymerizable compound.

The polymerization initiator is not particularly limited as long as it can initiate radical polymerization by light irradiation. The polymerization initiator is not particularly limited, and a conventional one can be used, and specific examples thereof include, for example, acetophenones, benzophenones, and Michler-Benzoyl benzoate. , α-pentyl decyl ester, thioxanthone, propiophenone, biphenyl quinone, benzoin, fluorenyl phosphine oxide. Further, a photosensitizer is preferably used in combination, and specific examples thereof include n-butylamine, triethylamine, poly-n-butylphosphine, and the like.

In the above-mentioned polymerization initiator, when the binder resin is a resin having a radical polymerizable unsaturated group, it is preferred to use acetophenone, benzophenone, thioxanthone, benzoin, alone or in combination. Benzoin methyl ether and the like.

The content of the polymerization initiator in the composition for an uneven layer is preferably 0.5 parts by mass or more and 10.0 parts by mass or less based on 100 parts by mass of the photopolymerizable compound. By setting the content of the polymerization initiator in this range, the performance of the hard coat layer can be sufficiently maintained, and the hardening inhibition can be suppressed.

The content ratio (solid content) of the raw material in the composition for an uneven layer is not particularly limited, but is usually preferably 5% by mass or more and 70% by mass or less, more preferably 25% by mass or more and 60% by mass or less.

(leveling agent)

As a leveling agent, for example, a polysiloxane or a fluorine-based surfactant, it is preferable to prevent the uneven layer from being a Benard Cell structure. When the solvent-containing resin composition is applied and dried, a surface tension difference or the like occurs on the surface and the inner surface of the coating film in the coating film, whereby a large amount of convection is caused in the coating film. The structure resulting from this convection is called a Bena vortex, and it is a cause of a problem of producing pomelo peel or coating defects in the formed uneven layer.

When the Bena vortex structure is present, there is a possibility that the unevenness of the surface of the uneven layer is too large. When using a leveling agent as described above, since it can be prevented This convection makes it possible to obtain not only the uneven layer having no defects or unevenness but also the adjustment of the uneven shape on the surface of the uneven layer.

The preparation method of the composition for an uneven layer is not particularly limited as long as the components can be uniformly mixed, and can be carried out by a conventional apparatus such as a paint shaker, a bead mill, a kneader or a kneader.

After the composition for the uneven layer is applied onto the surface of the first light transmissive substrate 30, the composition for the uneven layer of the coating film is dried and sent to the heated zone, and the uneven layer is used in various conventional methods. The composition was dried to evaporate the solvent. Here, the distribution state of the aggregates of the fine particles can be adjusted by selecting the relative evaporation rate, the solid content concentration, the coating liquid temperature, the drying temperature, the wind speed of the drying wind, the drying time, the solvent atmosphere concentration in the drying zone, and the like.

In particular, the method of adjusting the distribution state of the agglomerates of the fine particles according to the selection of the drying conditions is simpler and more preferable. The specific drying temperature is preferably 30 to 120 ° C, and the drying wind speed is preferably 0.2 to 50 m/s. The distribution state of the agglomerates of the microparticles can be obtained by drying the coating in an appropriate one or more times within the range. Adjust to the desired state.

Subsequently, the composition for the coating film-like uneven layer is irradiated with light such as ultraviolet rays, and the photopolymerizable compound is polymerized (crosslinked) to cure the uneven layer composition to form the uneven layer 31.

When ultraviolet rays are used as the light for curing the composition for an uneven layer, ultraviolet rays emitted from an ultrahigh pressure mercury lamp, a high pressure mercury lamp, a low pressure mercury lamp, a carbon arc lamp, a xenon arc lamp, a metal halide lamp or the like can be used. Further, the wavelength of the ultraviolet light can be used in a wavelength region of 190 to 380 nm. electronic Specific examples of the beam source are Cockcroft-Walton type, van de Graaff type, resonant transformer type, insulated core transformer type, or linear type, high frequency and high voltage acceleration. Various electron beam accelerators such as Dynamitron type and high frequency type.

The low refractive index layer 32 may also be formed on the uneven layer 31 formed in the above-described order as needed. In the formation of the low refractive index layer 32, the viscosity of the composition for the low refractive index layer to which the above material is added is preferably 0.5 to 5 mPa ‧ (25 ° C), preferably 0.7 to 3 mPa, for obtaining a preferable coating property. The range of s (25 ° C). Thereby, a film having no coating unevenness can be uniformly formed, and a low refractive index layer which is particularly excellent in adhesion can be formed.

The curing means of the composition for the low refractive index layer is the same as that described above for the uneven layer 31. When a heating means is used for the hardening treatment, it is preferred to add a thermal polymerization initiator which initiates polymerization of a radical-generating polymerizable compound by heating, in the fluorine-based resin composition.

[Touch Panel]

The touch panel 40 includes a sensing unit 50 , a cover glass 70 disposed closer to the observer than the sensing unit 50 , and a transparent adhesive layer 42 for fixing the sensing unit 50 and the cover glass 70 . The touch panel 40 only needs to include the sensing unit 50, and the cover glass 70 and the transparent adhesive layer 42 are not provided.

"Sensor Department"

The sensing unit 50 functions as a part of the function of the sensor of the touch panel 40. The sensing unit 50 is not particularly limited, but is exemplified as a projection type static These sensors are used in capacitive mode. The sensing portion 50 shown in FIG. 1 is formed by a base film 51 in which a patterned conductive layer 52 is laminated via a transparent adhesive layer 54 and a base film 51 provided with a patterned conductive layer 53. structure.

<Substrate film>

The base film 51 shown in FIG. 1 includes a light transmissive base material 55, a hard coat layer 56 provided on one surface of the light transmissive base material 55, and a high refractive index layer 57 provided on the hard coat layer 56. The low refractive index layer 58 on the high refractive index layer 57 and the hard coat layer 59 laminated on the other surface of the light transmissive substrate 55.

A light-transmitting substrate, a hard coat layer provided on one surface of the light-transmitting substrate, a high refractive index layer provided on the hard coat layer, and a low refractive index layer provided on the high refractive index layer may be used. A base film provided on the other surface of the light transmissive substrate, a high refractive index layer provided on the hard coat layer, and a low refractive index layer laminated on the high refractive index layer in place of the base film 51 . In this case, a patterned conductive layer is provided on each of the low refractive index layers on both sides of the base film.

The light transmissive substrate 55, the hard coat layer 56, the high refractive index layer 57, and the low refractive index layer 58 can use a light transmissive substrate, a hard coat layer, a high refractive index layer and a general touch panel sensor. Since the low refractive index layer is omitted, the description thereof is omitted here.

<conductive layer>

The shape of the conductive layers 52 and 53 is not particularly limited, but is, for example, a square or an elongated strip. The conductive layers 52 and 53 are connected to a terminal portion (not shown) via a take-out pattern (not shown). Although the conductive layers 52 and 53 are exemplified by a transparent conductive material, the conductive layer may be composed of a mesh-shaped wire. The transparent conductive material is exemplified by, for example, tin-doped indium oxide (ITO), antimony-doped tin oxide (ATO), zinc oxide, indium oxide (In ₂ O ₃ ), aluminum-doped zinc oxide (AZO), doping. A metal oxide such as gallium zinc oxide (GZO), tin oxide, zinc oxide-tin oxide, indium oxide-tin oxide, or zinc oxide-indium oxide-magnesia. The wire material is exemplified by a light-shielding metal material such as silver, copper, aluminum, or the like.

The film thickness of the conductive layers 52 and 53 is preferably set as appropriate depending on the specifications of the electric resistance, etc., but is, for example, 10 nm or more and 50 nm or less.

The method of forming the conductive layers 52 and 53 is not particularly limited, and a sputtering method, a vacuum deposition method, an ion sputtering method, a CVD method, a coating method, a printing method, or the like can be used. A method of patterning a conductive layer is exemplified by, for example, photolithography.

When the conductive layer is composed of a mesh-shaped wire, the width of the wire is preferably 1 μm or more and 20 μm or less, more preferably 2 μm or more and 15 μm or less. Accordingly, the effect of the wire on the image recognized by the observer can be reduced to an extent that can be ignored.

When the conductive layer is composed of a mesh-shaped wire, the conductive layer has an opening portion formed by a wire, for example, a rectangular shape. The aperture ratio of the conductive layer is appropriately set depending on the characteristics of the image light emitted from the display device, and is, for example, in the range of 80% or more and 90% or less. Further, the arrangement pitch of the openings is in the range of 100 μm or more and 1000 μm or less in accordance with the obtained aperture ratio or the width of the wire. Set within the perimeter.

According to the present embodiment, the display panel 20 is provided with an optical film 29 having an internal haze value of 1% or more and 30% or less and an average inclination angle θa of the surface 29A of 0.074° or more and 2.000° or less. In the case of the surface 10A, interference light generated by interference of light reflected on the surface 40A of the display panel side of the touch panel 40 with light reflected on the surface 29A of the optical film 29 provided on the display panel 20 (also referred to as Newton) Rings or water ripples are not visible and can suppress glare. Although not limited by theory, since the average tilt angle θa of the optical film 29 is adjusted to the above range, the human eye cannot recognize the interference fringes, and the interference fringes can be effectively invisible. Further, since the internal haze value is adjusted to the above range, the light is greatly expanded and the glare can be effectively suppressed. Further, according to the present embodiment, since the optical film 29 is provided on the display panel 20, glare can be more effectively suppressed. Further, even if the touch panel 40 is strongly pressed by a finger or the like, the surface 40A on the display panel 20 side of the touch panel 40 is brought into contact with the surface 29A of the optical film 29 provided on the display panel 20, because the surface 29A of the optical film 29 is The presence of the unevenness makes the contact area between the surface 40A of the touch panel 40 and the surface 29A of the optical film 29 small, so that the advantage of effectively suppressing the bonding is obtained.

[Second Embodiment]

Hereinafter, a display device with a touch panel according to a second embodiment of the present invention will be described with reference to the drawings. 4 is a schematic configuration diagram of a display device with a touch panel according to a second embodiment.

[Display device with touch panel]

The display device 110 with a touch panel according to the second embodiment shown in FIG. 4 is the same as the display device 10 with a touch panel according to the first embodiment shown in FIG. 1, and mainly includes a display panel 20 for displaying an image. The touch panel 40 disposed closer to the viewer side than the display panel 20 and the backlight unit 80 disposed on the back side of the display panel 20 . In the present embodiment, since the display panel 20 is a liquid crystal display panel, the display device 110 with a touch panel includes the backlight unit 80. However, the backlight unit 80 may not be provided depending on the type of the display panel (display element). The display panel 20 and the touch panel 40 are disposed via a gap 111 such as an air gap. The surface of the touch panel 40 on the display panel 20 side is provided with an optical film 29 disposed such that the uneven surface of the uneven layer 31 is on the gap 111 side, and between the optical film 29 and the surface of the touch panel 40 on the display panel 20 side. A transparent adhesive layer 41 may also be provided. Further, the surface 20A on the side of the touch panel 40 of the display panel 20 is not provided with an optical film or an anti-reflection film.

Since the display panel 20, the touch panel 40, and the optical film 29 are the same as those of the first embodiment, the description thereof is omitted here.

According to the present embodiment, the touch panel 40 is provided with an optical film 29 having an internal haze value of 1% or more and 30% or less and an average inclination angle θa of the surface 29A of 0.074° or more and 2.000° or less. When the surface 110A is displayed, the interference light generated by the light reflected on the surface 29A of the optical film 29 provided on the touch panel 40 and the light reflected on the surface 20A of the touch panel 40 side of the display panel 20 can also be generated. Cow The ring or water ripple is not visible and can suppress glare. Although not limited by theory, since the average tilt angle θa of the optical film 29 is adjusted to the above range, the human eye cannot recognize the interference fringes, and the interference fringes can be effectively invisible. Further, since the internal haze value is adjusted to the above range, the light is greatly expanded and the glare can be effectively suppressed. In addition, even if the touch panel 40 is strongly pressed by a finger or the like, the surface 29A of the optical film 29 provided on the touch panel 40 is brought into contact with the surface 20A of the touch panel 40 side of the display panel 20, and the surface of the optical film 29 is also The presence of the unevenness of 29A makes the contact area between the surface 29A of the optical film 29 and the surface 20A of the display panel 20 small, so that the advantage of effectively suppressing the bonding is obtained.

[Third embodiment]

Hereinafter, a display device with a touch panel according to a third embodiment of the present invention will be described with reference to the drawings. Fig. 5 is a schematic configuration diagram of a display device with a touch panel according to a third embodiment.

[Display device with touch panel]

The display device 210 with a touch panel according to the third embodiment shown in FIG. 5 is the same as the display device 10 with a touch panel according to the first embodiment shown in FIG. 1, and mainly includes a display panel 20 for displaying an image. The touch panel 40 disposed closer to the viewer side than the display panel 20 and the backlight unit 80 disposed on the back side of the display panel 20 . In the present embodiment, since the display panel 20 is a liquid crystal display panel, the display device 210 with the touch panel includes the backlight unit 80, but may be based on the display panel (display element). The type does not include the backlight unit 80. The display panel 20 and the touch panel 40 are disposed via a gap 211 such as an air gap. The surface of the touch panel 40 on the side of the touch panel 40 is provided with an optical film 29 disposed such that the uneven surface of the uneven layer 31 is on the gap 211 side. Further, the surface of the touch panel 40 on the side of the display panel 20 is also provided. The optical film 29 is disposed such that the uneven surface of the uneven layer 31 is on the side of the gap 211. A transparent adhesive layer 41 may be provided between the optical film 29 and the surface of the touch panel 40 on the display panel 20 side.

Since the display panel 20, the touch panel 40, and the optical film 29 are the same as those of the first embodiment, the description thereof is omitted here.

According to the present embodiment, both of the display panel 20 and the touch panel 40 have an optical film 29 having an internal haze value of 1% or more and 30% or less and an average inclination angle θa of the surface 29A of 0.074° or more and 2.000° or less. Therefore, when the image display surface 210A is strongly pressed, the light reflected on the surface 29A of the optical film 29 provided on the touch panel 40 can be interfered with the light reflected on the surface 29A of the optical film 29 provided on the display panel 20. The resulting interference fringes (also known as Newton's rings or water ripples) are not visible and can suppress glare. Although not limited by theory, since the average tilt angle θa of the optical film 29 is adjusted to the above range, the human eye cannot recognize the interference fringes, and the interference fringes can be effectively invisible. Further, since the internal haze value is adjusted within the above range, the light is greatly expanded and the glare can be effectively suppressed. In addition, even if the touch panel 40 is strongly pressed by a finger or the like, the surface 29A of the optical film 29 provided on the touch panel 40 is brought into contact with the surface 29A of the optical film 29 provided on the display panel 20, The presence of the unevenness of the surface 29A of 29 causes the contact area between the surface 29A of the optical film 29 provided on both the touch panel 40 and the display panel 20 to be small, so that the advantage of effectively suppressing the bonding is obtained.

[Fourth embodiment]

Hereinafter, a display device with a touch panel according to a fourth embodiment of the present invention will be described with reference to the drawings. Fig. 6 is a schematic configuration diagram of a display device with a touch panel according to a fourth embodiment.

[Display device with touch panel]

The display device 310 with a touch panel according to the fourth embodiment shown in FIG. 6 is similar to the display device 10 with a touch panel according to the first embodiment shown in FIG. 1, and mainly includes a display panel 20 for displaying an image. The touch panel 40 disposed closer to the viewer side than the display panel 20 and the backlight unit 80 disposed on the back side of the display panel 20 . In the present embodiment, since the display panel 20 is a liquid crystal display panel, the display device 110 with the touch panel includes the backlight unit 80. However, the backlight unit 80 may not be provided depending on the type of the display panel (display element). The display panel 20 and the touch panel 40 are disposed via a gap 311 such as an air gap. In this embodiment, the display device with the touch panel is provided with an optical film on the surface of the touch panel side of the display panel and the surface of the display panel side of the touch panel, and the touch panel of the display panel The surface of the side surface and the surface of the display panel side of the touch panel are provided with a second light-transmitting substrate and a hard coat layer laminated on the second light-transmitting substrate. An antireflection film of a layer and an antireflection layer laminated on the hard coat layer. 6 is an optical film 29 disposed on the surface of the touch panel 40 side of the display panel 20 such that the uneven surface of the uneven layer 31 is on the side of the gap 311, and the surface of the touch panel 40 on the side of the display panel 20 is also Further, an anti-reflection film 60 that is disposed such that the anti-reflection layer 63 to be described later becomes the gap 311 side may be provided. The transparent adhesive layer 41 may be provided between the anti-reflection film 60 and the surface of the touch panel 40 on the display panel 20 side.

Since the display panel 20, the touch panel 40, and the optical film 29 are the same as those of the first embodiment, the description thereof is omitted here.

[Anti-reflective film]

The anti-reflection film 60 is separated from the optical film 29. The interval d between the surfaces 29A of the optical film 29 and the surface 60A of the antireflection film 60 shown in Fig. 6 is preferably 50 μm or more and 1000 μm or less from the viewpoint of thinning of the display device with a touch panel. This interval d is an interval at which the observer's finger does not touch the image display surface 310A.

The anti-reflection film 60 has a structure in which the second light-transmitting substrate 61, the hard coat layer 62, and the anti-reflection layer 63 are sequentially laminated toward the display panel 20 side. Since the second light transmissive substrate 61 is the same as the first light transmissive substrate 30, the description thereof will be omitted. As the hard coat layer 62, a hard coat layer which is generally used for an antireflection film can be used.

Further, the antireflection layer 63 may be an antireflection layer used for a general antireflection film, and the constitution or composition is not particularly limited. For example, the anti-reflective layer 63 may be formed by a high refractive index layer 64 and a low fold provided on the high refractive index layer 64. The luminosity layer 65 is formed, but is not limited thereto, and may be composed only of the low refractive index layer 65.

According to the present embodiment, the display panel 20 is provided with an optical film 29 having an internal haze value of 1% or more and 30% or less and an average inclination angle θa of the surface 29A of 0.074° or more and 2.000° or less. Therefore, the image display surface is strongly pressed. At 310A, interference fringes generated by interference between the light reflected on the surface 60A of the anti-reflection film 60 provided on the touch panel 40 and the light reflected on the surface 29A of the optical film 29 provided on the display panel 20 (also referred to as interference fringes) It is not visible for Newton's rings or water ripples and can suppress glare. Although not limited by theory, since the average tilt angle θa of the optical film 29 is adjusted to the above range, the human eye cannot recognize the interference fringes, and the interference fringes can be effectively invisible. Further, since the internal haze value is adjusted within the above range, the light is greatly expanded and the glare can be effectively suppressed. Further, according to the present embodiment, since the optical film 29 is provided on the display panel 20, glare can be more effectively suppressed. In addition, even if the touch panel 40 is strongly pressed by a finger or the like, and the surface 60A of the anti-reflection film 60 provided on the touch panel 40 is in contact with the surface 29A of the optical film 29 provided on the display panel 20, the optical film 29 is also The presence of the concavities and convexities on the surface 29A makes the contact area between the surface 29A of the optical film 29 and the surface 60A of the antireflection film 60 small, so that the adhesion is effectively suppressed.

[Examples]

The present invention will be described in detail below by way of examples, but the invention is not limited thereto.

<Modulation of composition for uneven layer>

First, each component was prepared so as to have the composition shown below, and the composition for uneven layers was obtained.

(Constituent 1 for uneven layer)

‧ Organic fine particles (acrylic-styrene copolymer particles, average particle diameter 2.0 μm, refractive index 1.55, manufactured by Sekisui Kogyo Co., Ltd.): 3 parts by mass

‧ Smoked cerium oxide (octyl decane treatment, average primary particle size 12nm, manufactured by AEROSIL, Japan): 1 part by mass

‧ Pentaerythritol tetraacrylate (PETTA) (product name: PETA, manufactured by Daicel Cytec): 60 parts by mass

‧ urethane acrylate (product name: UV1700B, manufactured by Nippon Synthetic Chemical Co., Ltd., weight average molecular weight 2000, functional group number 10): 40 parts by mass

‧ Polymerization initiator (IRGACURE 184, manufactured by BASF, Japan): 5 parts by mass

‧ Polyether modified polyfluorene (TSF4460, manufactured by Momentive Performance Materials): 0.025 parts by mass

‧ Toluene: 105 parts by mass

‧Isopropanol: 30 parts by mass

‧Cyclohexanone: 15 parts by mass

(Constituent 2 for the uneven layer)

‧ Organic fine particles (acrylic-styrene copolymer particles, average particle diameter: 3.5 μm, refractive index: 1.55, manufactured by Sekisui Kogyo Co., Ltd.): 12 parts by mass

‧ Smoked cerium oxide (octyl decane treatment, average particle size 12nm, manufactured by AEROSIL, Japan): 3 parts by mass

‧ Pentaerythritol tetraacrylate (PETTA) (product name: PETA, manufactured by Daicel Cytec): 60 parts by mass

‧ urethane acrylate (product name: UV1700B, manufactured by Nippon Synthetic Chemical Co., Ltd., weight average molecular weight 2000, functional group number 10): 40 parts by mass

‧ Polymerization initiator (IRGACURE 184, manufactured by BASF, Japan): 5 parts by mass

‧ Polyether modified polyfluorene (TSF4460, manufactured by Momentive Performance Materials): 0.025 parts by mass

‧ Toluene: 105 parts by mass

‧Isopropanol: 30 parts by mass

‧Cyclohexanone: 15 parts by mass

(Constituent for bump layer 3)

‧ Organic fine particles (polystyrene particles, average particle size 3.5 μm, refractive index 1.60, manufactured by Soken Chemical Co., Ltd.): 15 parts by mass

‧ Pentaerythritol triacrylate (PETA) (product name: PETIA, manufactured by Daicel Cytec): 60 parts by mass

‧ Polymerization initiator (IRGACURE 184, manufactured by BASF, Japan): 5 Measure

‧ Polyether modified polyfluorene (TSF4460, manufactured by Momentive Performance Materials): 0.025 parts by mass

‧ Toluene: 105 parts by mass

‧Cyclohexanone: 35 parts by mass

(Constituent 4 for the uneven layer)

‧ Organic fine particles (polystyrene particles, average particle size 3.5 μm, refractive index 1.60, manufactured by Soken Chemical Co., Ltd.): 17 parts by mass

‧ Pentaerythritol triacrylate (PETA) (product name: PETIA, manufactured by Daicel Cytec): 60 parts by mass

‧ Polymerization initiator (IRGACURE 184, manufactured by BASF, Japan): 5 parts by mass

‧ Polyether modified polyfluorene (TSF4460, manufactured by Momentive Performance Materials): 0.025 parts by mass

‧ Toluene: 105 parts by mass

‧Cyclohexanone: 35 parts by mass

(Constituent 5 for the uneven layer)

‧ Amorphous cerium oxide particles (inorganic fine particles, hydrophobization treatment, average particle diameter (laser diffraction scattering method) 2.7 μm, manufactured by Fuji Silysia Co., Ltd.): 7 parts by mass

‧ Pentaerythritol triacrylate (PETA) (product name: PETIA, manufactured by Daicel Cytec): 60 parts by mass

‧ Polymerization initiator (IRGACURE 184, manufactured by BASF, Japan): 5 parts by mass

‧ Polyether modified polyfluorene (TSF4460, manufactured by Momentive Performance Materials): 0.025 parts by mass

‧ Toluene: 150 parts by mass

‧Methyl isobutyl ketone (MIBK): 35 parts by mass

(Constituent 6 for the uneven layer)

‧ Organic fine particles (polystyrene particles, average particle diameter 3.0 μm, refractive index 1.60, manufactured by Sekisui Chemicals Co., Ltd.): 10 parts by mass

‧Inorganic fine particles (average primary particle diameter: 12 nm, cerium oxide having a reactive functional group introduced on the surface, solvent MIBK, solid content: 30%, manufactured by Nissan Chemical Co., Ltd.): 160 parts by mass

‧ Pentaerythritol triacrylate (PETA) (product name: PETIA, manufactured by Daicel Cytec): 10 parts by mass

‧ urethane acrylate (product name: UV1700B, manufactured by Nippon Synthetic Chemical Co., Ltd., weight average molecular weight 2000, functional group number 10): 40 parts by mass

‧ Polymerization initiator (IRGACURE 184, manufactured by BASF, Japan): 5 parts by mass

‧Polyether modified polyfluorene (TSF4460, manufactured by Momentive Performance Materials): 0.1 parts by mass

‧Methyl isobutyl ketone (MIBK): 70 parts by mass

(Constituent 7 for the uneven layer)

‧ Pentaerythritol tetraacrylate (PETTA) (product name: PETA, manufactured by Daicel Cytec): 60 parts by mass

‧ urethane acrylate (product name: UV1700B, manufactured by Nippon Synthetic Chemical Co., Ltd., weight average molecular weight 2000, functional group number 10): 40 parts by mass

‧ Polymerization initiator (IRGACURE 184, manufactured by BASF, Japan): 5 parts by mass

‧ Polyether modified polyfluorene (TSF4460, manufactured by Momentive Performance Materials): 0.025 parts by mass

‧ Toluene: 105 parts by mass

‧Isopropanol: 30 parts by mass

‧Cyclohexanone: 15 parts by mass

(concave layer 8)

‧ Organic fine particles (acrylic-styrene copolymer particles, average particle diameter: 5.0 μm, refractive index: 1.56, manufactured by Sekisui Chemicals Co., Ltd.): 8 parts by mass

‧ Amorphous cerium oxide (average particle size 1.5 μm): 6 parts by mass

‧ Pentaerythritol triacrylate (PETA) (product name: PETIA, manufactured by Daicel Cytec): 90 parts by mass

‧PMMA polymer (molecular weight 75000): 10 parts by mass

‧ Polymerization initiator (IRGACURE 184, manufactured by BASF, Japan): 5 parts by mass

‧Polyether modified polyfluorene (TSF4460, Momentive Performance Made by Materials): 0.025 parts by mass

‧ Toluene: 150 parts by mass

‧Cyclohexanone: 80 parts by mass

<Preparation of Compositions for Hard Coatings>

Each component was prepared so as to have the composition shown below, and the composition for hard-coat layers was obtained.

‧ Dipentaerythritol hexaacrylate (product name: KAYARAD DPHA, manufactured by Nippon Kayaku Co., Ltd.): 100 parts by mass

‧ Polymerization initiator (IRGACURE 184, manufactured by BASF, Japan): 5 parts by mass

‧ Leveling agent (product name: F-568, manufactured by DIC): 0.1 parts by mass (100% conversion of solid content)

‧Methyl isobutyl ketone (MIBK): 120 parts by mass

<Modulation of Composition for Low Refractive Index Layer>

Each component was prepared so as to have the composition shown below, and the composition for a low refractive index layer was obtained.

(Composition for low refractive index layer 1)

‧ hollow cerium oxide microparticles (solid content of hollow cerium oxide microparticles: 20% by mass, solution: methyl isobutyl ketone, average particle diameter: 60 nm): 30 parts by mass

‧ Pentaerythritol triacrylate (PETA) (product name: PETIA, Daicel Cytec company): 10 parts by mass

‧ Polymerization initiator (IRGACURE 127; manufactured by BASF, Japan): 0.35 parts by mass

‧ Modified polyoxygenated oil (X22164E; manufactured by Shin-Etsu Chemical Co., Ltd.): 0.5 parts by mass

‧Methyl isobutyl ketone (MIBK): 320 parts by mass

‧ Propylene glycol monomethyl ether acetate (PGMEA): 160 parts by mass

(Composition 2 for low refractive index layer)

‧ hollow cerium oxide microparticles (solid content of hollow cerium oxide microparticles: 20% by mass, solution: methyl isobutyl ketone, average particle diameter: 60 nm): 70 parts by mass

‧ Pentaerythritol triacrylate (PETA) (product name: PETIA, manufactured by Daicel Cytec): 10 parts by mass

‧ Polymerization initiator (IRGACURE 127; manufactured by BASF, Japan): 0.35 parts by mass

‧ Modified polyoxygenated oil (X22164E; manufactured by Shin-Etsu Chemical Co., Ltd.): 0.5 parts by mass

‧Methyl isobutyl ketone (MIBK): 500 parts by mass

‧ Propylene glycol monomethyl ether acetate (PGMEA): 160 parts by mass

<Sample 1>

A triacetonitrile-based cellulose resin film (KC4UAW, manufactured by KONIKA MINOLTA Co., Ltd.) having a thickness of 40 μm as a light-transmitting substrate was prepared, and the composition 1 for the uneven layer was applied to one side of a film of a triethylenesulfonyl cellulose resin. Forming a coating film. Then, the dried air at 70 ° C was circulated to the formed coating film at a flow rate of 0.2 m/s for 15 seconds, and then dried at 70 ° C for 30 seconds at a flow rate of 10 m/s to dry the coating film. The solvent was evaporated, and ultraviolet rays were irradiated so that the cumulative amount of light became 100 mJ/cm ² in a nitrogen atmosphere (oxygen concentration: 200 ppm or less) to cure the coating film, thereby forming a concavo-convex layer having a thickness of 4 μm (during curing). Next, the composition 1 for a low refractive index layer is applied onto the uneven layer to form a coating film. Then, the dried air of 40 ° C was circulated to the formed coating film at a flow rate of 0.2 m/s for 15 seconds, and then dried at 40 ° C for 30 seconds at a flow rate of 10 m/s to dry the coating film. The solvent was evaporated, and ultraviolet rays were irradiated so that the cumulative amount of light became 100 mJ/cm ² in a nitrogen atmosphere (oxygen concentration: 200 ppm or less) to cure the coating film, thereby forming a low refractive index layer having a thickness of 100 nm (when cured). Thereby, the optical film of the sample 1 was produced.

<Sample 2>

In the sample 2, the composition 1 for the uneven layer was replaced with the composition 2 for the uneven layer, and the uneven layer of 5 μm thick (when hardened) was formed in the same manner as the sample 1. A low refractive index layer was not formed in the sample 2. Thereby, the optical film of the sample 2 was produced.

<Sample 3>

In the sample 3, an optical film of the sample 3 was produced in the same manner as in the sample 2 except that the composition for the uneven layer 3 was used instead of the composition 2 for the uneven layer to form an uneven layer of 4.5 μm thick (when cured).

<Sample 4>

In the sample 4, an optical film of the sample 4 was produced in the same manner as in the sample 2 except that the composition for the uneven layer 4 was used instead of the composition for the uneven layer 3 to form an uneven layer of 4.0 μm thick (when cured).

<Sample 5>

In the sample 5, an optical film of the sample 5 was produced in the same manner as in the sample 1, except that the low refractive index layer was not formed.

<Sample 6>

In the sample 6, an optical film of the sample 6 was produced in the same manner as in the sample 2, except that the composition for the uneven layer 5 was used instead of the composition 2 for the uneven layer to form an uneven layer of 2.0 μm thick (during curing).

<Sample 7>

In the sample 7, an optical film of the sample 7 was produced in the same manner as in the sample 2 except that the composition for the uneven layer 6 was used instead of the composition for the uneven layer 2 to form an uneven layer of 6.0 μm thick (when cured).

<Sample 8>

In the sample 8, an optical film of the sample 8 was produced in the same manner as in the sample 2 except that the composition for uneven layer 7 was used instead of the composition 2 for the uneven layer to form an uneven layer of 4.0 μm thick (when cured).

<Sample 9>

In the sample 9, an optical film of the sample 9 was produced in the same manner as in the sample 2 except that the composition for the uneven layer 8 was used instead of the composition for the uneven layer 2 to form an uneven layer of 4.0 μm thick (when cured).

<Sample 10>

In the sample 10, a hard coat layer 8.0 μm thick (when hardened) hard coat layer was formed instead of the hard coat layer composition 1 instead of the uneven layer composition 1 , and a low refractive index layer composition 2 was used instead of the low refractive index composition. The antireflection film of the sample 10 was prepared in the same manner as in the sample 1 except for the object 1.

<Measurement of total light transmittance and haze>

The total light transmittance of the samples 1 to 10 was measured by a haze meter (manufactured by Murakami Color Research Laboratory, model number: HM-150) in accordance with the method of JIS K7361. The haze is measured by a haze meter HM-150 (manufactured by Murakami Color Research Laboratory Co., Ltd.) in accordance with JIS K7136. The results are shown in Table 1.

<Measurement of image clarity]

The image clarity of the samples 1 to 10 was measured by the method of JIS K7105 using an image sharpness measuring instrument (ICM-1T, manufactured by SUGA Testing Machine Co., Ltd.). The results are shown in Table 1.

<Measurement of Reflected Y Value>

For the samples 1 to 10, a reflectance Y value was measured using a spectrophotometer (MPC3100, manufactured by Shimadzu Corporation). Specifically, the incident angle is 8 degrees from the surface side of each film (the optical film of the samples 1 to 9 is the surface side of the uneven layer or the low refractive index layer, and the antireflection film of the sample 10 is the surface side of the low refractive index layer). The light is received by the integrating sphere to receive the reflected light of the diffused light reflected by each film, and the reflectance of the wavelength range of 380 nm to 780 nm is measured with the whiteboard to which the BaSO ₄ powder is fixed as a reference, and then the brightness of the adult eye is converted. The soft body (for example, the software built into the MPC3100) calculates the reflected Y value under the condition of "C light source and field of view 2 degrees". In addition, the measurement of the Y value of the reflection was carried out in a state in which a black tape (manufactured by Teraoka Seisakusho Co., Ltd.) was attached to the surface (back surface) opposite to the surface on which the uneven layer or the hard coat layer of the triacetyl cellulose substrate was formed.

<Measurement of Surface Roughness (Ra, Rz, θa)>

In the surface of the optical film of Samples 1 to 9 (the surface of the uneven layer or the low refractive index layer), and the surface of the antireflection film of the sample 10 (the surface of the low refractive index layer), the average tilt angle θa, arithmetic mean roughness Ra And the ten-point average roughness Rz was measured using the surface roughness measuring instrument (Model: SE-3400 / Otaru Research Institute Co., Ltd.) under the following measurement conditions.

1) The stylus of the surface roughness detecting unit (trade name SE2555N (2μ standard) manufactured by Otaru Research Institute Co., Ltd.)

‧ Tip radius of curvature 2μm, apex angle 90 degrees, material diamond

2) Measurement conditions of the surface roughness measuring device

‧Base length (cutoff value of thick curve λc): 0.25mm

‧ Evaluation length (reference length (cutoff value λc) × 5): 1.25

‧ trajectory movement speed: 0.1mm/s

‧Prepared length: (cutoff value λc) × 2

‧ Vertical magnification: 2000 times

‧ Horizontal magnification: 10 times

Hereinafter, the results are shown in Table 1.

<Examples 1 to 8 and Comparative Examples 1 to 4>

One or two films were taken out from the films of Samples 1 to 10, and one piece was set as film A (film on the display panel side), and the other piece was set as film B (film on the touch panel side). The combination of the films in the respective examples and comparative examples is shown in Table 2. Further, the film A and the film B were subjected to the following interference fringe evaluation, glare evaluation, and visibility evaluation.

<Evaluation of interference fringes>

First, the film A was attached to a black acrylic plate via a transparent adhesive. Further, the film B was bonded to a glass plate having a thickness of 0.7 mm and a size of 10 cm × 10 cm via a transparent adhesive (product name "PD-S1", manufactured by PANAC Co., Ltd.). Next, the surface of the film A (the samples 1 to 9 are the surface of the uneven layer or the low refractive index layer, and the sample 10 is the surface of the low refractive index layer) and the surface of the sample B (the samples 1 to 9 are the uneven layer or the low refractive index). The surface of the layer, the sample 10 is the surface of the low refractive index layer, so as to be spaced apart from each other, the tape is attached to both ends of the acrylic plate to which the film A is attached, and the glass plate with the film B is disposed. The space between the surface of the film A and the surface of the film B was 0.1 mm. Then, the sodium lamp disposed on the glass attached to the film B was irradiated with light by a finger on the glass side of the self-attached film B, and it was examined whether interference fringes were confirmed.

The evaluation criteria are as follows.

◎: interference fringes were not confirmed

○: Although a little interference fringe was observed, it was no problem.

×: The interference fringe is clearly confirmed

<glare evaluation>

First, the tape was attached to both ends of the surface of the film B of the glass plate to which the film B was attached. Next, the light box (white surface light source) having a brightness of 1500 cd/m ² , the black matrix glass of 350 ppi, the glass plate with the film A and the film B are stacked in the same order from the bottom, and the distance from the left and right sides is about 30 cm. From the angle, visual evaluation was performed on 15 subjects. It was judged whether or not glare was felt, and glare was evaluated by the following criteria.

◎: The answer is good for 13 or more people.

○: The answer is good for 7 to 12 people.

×: The answer is good for 6 or less people.

<Identification Evaluation (Contrast Ratio)>

The contrast ratio was determined by the following method. First, it is prepared to provide a diffusing plate on a cold cathode tube light source as a backlight unit. Two polarizing plates (AMN-3244TP, manufactured by SAMSUNG Co., Ltd.) were placed thereon, and a film A and a film B with glass were placed thereon with an air gap interposed therebetween. The space between the surface of the film A and the surface of the film B was 0.1 mm. Next, the brightness of the transmitted light was measured therefrom. The L _max of the brightness of the light that passes through the two polarizing plates when placed in a parallel polarizer (parallel Nicol) divided by the L _min of the brightness of the light that is passed through the crossed polarizer (L _max /L _min ) as a contrast. Next, the contrast (L ₁ ) of the films of Samples 1 to 9 was divided by the value of the contrast (L ₂ ) when the samples 1 to 9 were replaced as the light-transmitting substrate (triethylenesulfonated cellulose resin film) ( L ₁ /L ₂ )×100 (%) as a contrast ratio. Further, the measurement of the brightness was carried out in a dark room of 5 lx or less. The above brightness was measured using a color luminance meter (BM-5A manufactured by Topcon Corporation), and the measurement angle of the color luminance meter was set to 1° to the field of view on the sample. The measurement was carried out at 5 mm. Further, the amount of light of the backlight was set such that the brightness of the two polarizing plates was set to be a parallel polarizer at 3600 cd/m ² in a state where no sample was set.

◎: The contrast ratio is 60% or more

○: The contrast ratio is 30% or more and less than 60%

×: The contrast ratio is less than 30%

The results are shown in Table 2 below.

As shown in Table 1 and Table 2, in Comparative Example 1, since the internal haze value of the optical film was less than 1%, glare was confirmed. In Comparative Example 2, since the internal haze value exceeded 30%, the difference in visibility (contrast ratio) was confirmed. On the other hand, in Examples 1 to 8, since an optical film having an internal haze value of 1% or more and 30% or less was used, glare was not confirmed, or indeed I recognize a little glare, but it is no problem.

In Comparative Example 3, since the average inclination angle θa of the surface of the optical film was less than 0.074°, interference fringes were clearly confirmed. In Comparative Example 4, since the average inclination angle θa exceeded 2.000°, although the internal haze was 1% or more and 30% or less, glare was confirmed. On the other hand, in Examples 1 to 8, since the optical film having the average inclination angle θa of the surface of 0.074° or more and 2.000° or less was used, no interference fringes were observed, or a small amount of interference fringes was confirmed, but no problem was observed. .

Claims (6)

A display device with a touch panel, comprising: a display panel for displaying an image; and a display device with a touch panel disposed on the viewer side of the display panel, wherein the display panel and the display panel are The touch panel is provided with an optical film on at least one surface of the surface of the display panel on the touch panel side and the surface of the touch panel on the display panel side, and the optical film is sequentially provided. The first light-transmitting substrate and the uneven layer having the uneven surface laminated on the first light-transmitting substrate, and the uneven surface of the uneven layer is disposed on the gap side, and the internal mist of the optical film The average value of the surface of the optical film is from 0.074° to 0.26°. The display device with a touch panel according to claim 1, wherein the reflection Y value measured from the surface side of the optical film is 2.5% or less. The display device with a touch panel according to claim 1, wherein the optical film further includes a low refractive index layer having a lower refractive index than the uneven layer on the uneven layer. The display device with a touch panel according to claim 1, wherein the surface of the display panel on the touch panel side is provided with the optical film. The display device with a touch panel according to claim 1, wherein the optical film is provided on at least one surface of the surface of the touch panel on the touch panel side and the surface of the touch panel on the display panel side. The surface of the touch panel on the side of the touch panel and the surface of the touch panel on the side of the display panel are further provided with an anti-reflection film on the surface on which the optical film is not disposed, and the anti-reflection film has a second A light-transmitting substrate, a hard coat layer laminated on the second light-transmitting substrate, and an anti-reflection layer laminated on the hard coat layer. The touch panel display device of claim 1, wherein the uneven layer comprises cerium oxide microparticles, organic microparticles, and a binder resin.