JP2019200400A - Moire suppression film, moire suppression film laminate, and composite display device equipped with moire suppression film - Google Patents

Abstract

To provide a moire suppression film, a moire suppression film laminate, and a composite display device equipped with the moire suppression film, with which it is possible to effectively suppress a moire phenomenon, etc., while maintaining prescribed rectilinear permeability.SOLUTION: Provided is a moire suppression film 10 for suppressing a moire phenomenon occurring due to a difference between two spatial frequencies, the moire suppression film 10 including a plurality of columnar elements 12 composed of a material having a relatively high refractive index in a region 14 composed of a single layer whose refractive index is relatively low, the rectilinear permeability defined in relational expression (1) being 8% or less. Rectilinear permeability=Lp/Lo×100 (1), where Lp represents the luminance (cd/m) of transmitted light measured while the moire suppression film is sandwiched between two polarizers arranged in a parallel Nicol state, and Lo represents the luminance (cd/m) of transmitted light measured with only two polarizers arranged in a Parallel Nicol state.SELECTED DRAWING: Figure 1

Description

The present invention relates to a moire suppressing film, a moire suppressing film laminate, and a composite display device including a moire suppressing film.
In particular, when used between two pattern structure layer-containing optical members that include a fine pattern structure layer inside a liquid crystal panel or the like, it has excellent moire suppression properties and excellent backscattering prevention properties of incident light The present invention relates to a moire suppressing film capable of displaying an image with excellent contrast, a moire suppressing film laminate, and a composite display device including the moire suppressing film.

2. Description of the Related Art Conventionally, as a kind of display device, a stereoscopic image display device that displays an image stereoscopically has been proposed (Patent Document 1, etc.).
More specifically, it is a stereoscopic image display device having a structure in which two liquid crystal cells are stacked in the vertical direction. This is a stereoscopic image display device that displays an image in a stereoscopic manner by sending image information.

In addition, liquid crystal display devices that improve the contrast ratio and the like and further suppress moire have been proposed (Patent Documents 2 to 3, etc.).
More specifically, a light source unit, a first liquid crystal panel on which a first video based on a video signal is displayed, and a second liquid crystal panel on which a second video corresponding to the first video is displayed The first liquid crystal panel and the second liquid crystal panel are spaced apart from each other, and a particle-dispersed light diffusion layer having a predetermined haze value is used between the panels. This is a liquid crystal display device.

JP, 2015-114371, A (Claims etc.) Japanese Patent Laying-Open No. 2015-191052 (Claims etc.) Japanese Patent No. 4878032 (Claims etc.)

  Here, the stereoscopic image display device disclosed in Patent Document 1 has a structure in which two liquid crystal cells face each other with a gap therebetween. And a liquid crystal cell has pattern structure layers, such as a color filter, in the inside. Therefore, in the stereoscopic image display device disclosed in Patent Document 1, a moire phenomenon occurs due to optical interference in the two pattern structure layers corresponding to the two liquid crystal cells, and the stereoscopic image display is difficult to see. It was observed.

In addition, the liquid crystal display devices disclosed in Patent Documents 2 and 3 each have a predetermined haze value (for example, 50% or more, 90% or more) between the first liquid crystal panel and the second liquid crystal panel. The use of only a particle-dispersed light diffusion layer is proposed. Certainly, even with the light diffusing layer, the moire suppressing property is exhibited to some extent, but it is not sufficient.
In addition, when only the particle dispersion type light diffusion layer is used as the light diffusion layer, the backscattering of the incident light occurs, and it is difficult to obtain a high-contrast stereoscopic image display.

In view of the above circumstances, the present inventors have made extensive efforts, and at least the internal refractive index between the first pattern structure layer-containing optical member and the second pattern structure layer-containing optical member. It has been found that by using a moire suppressing film having a distribution structure and controlling the straight-line transmittance represented by a predetermined relational expression to be equal to or less than a predetermined value, the moire suppressing property is excellent and the back scattering can be reduced, so that high contrast can be achieved. The present invention has been completed.
That is, an object of the present invention is to provide a moire suppressing film that is excellent in moire suppression and has high back contrast due to less backscattering, a moire suppressing film laminate including such a moire suppressing film, and such An object of the present invention is to provide a composite display device including a moire suppressing film and capable of displaying a good stereoscopic image.

According to the present invention, a moiré suppressing film that suppresses a moiré phenomenon caused by a difference between two spatial frequencies, and a material having a relatively high refractive index in a region having a relatively low refractive index composed of a single layer. A moiré suppressing film having a plurality of columnar objects and having a straight transmittance of 8% or less defined by the following relational expression (1) is provided. Thus, the above-described problem can be solved.
Straight transmittance (%) = Lp / Lo × 100 (1)
(Lp: Brightness of transmitted light (cd / m ² ) measured with a moire suppression film sandwiched between two polarizing plates arranged in a parallel Nicol state, Lo: two sheets arranged in a parallel Nicol state Brightness of transmitted light (cd / m ² ) measured only on the polarizing plate
By using a moire suppressing film having such an internal refractive index distribution structure and having a predetermined straight-line transmittance between two pattern structure layer-containing optical members, it is excellent in moire suppression, and high A contrast stereoscopic image or the like can be visually recognized.

Further, in configuring the present invention, when the progress direction of the manufacturing process of the moire suppressing film is the MD direction, and the direction crossing the horizontal direction and the vertical direction of the manufacturing process is the TD direction, the MD direction and the TD direction It is preferable to set the variable angle haze value of ± 70 ° with reference to the above or one of the variable angle haze values of 80% or more.
By obtaining a moire suppression film that takes into account the angle haze value based on the MD direction and the TD direction at the time of manufacturing such a moire suppression film, an excellent moire suppression property can be obtained from any direction. Can do.

In configuring the present invention, the haze value (normal haze value) measured in accordance with JIS K 7136: 2000 is preferably 80% or more.
Thus, by using a moiré suppressing film that also takes into account the normal haze value measured in accordance with JIS, it is possible to obtain more excellent moiré suppressing properties regardless of variations in thickness.

In constituting the present invention, the thickness is preferably set to a value within the range of 40 to 500 μm.
By using a moiré suppressing film with such a thickness, for example, even when it is disposed and used between the first pattern structure layer-containing optical member and the second pattern structure layer-containing optical member. In addition, it is possible to obtain excellent moire suppression without excessively increasing the thickness as a whole.

In constituting the present invention, it is preferable to provide an adhesive layer on at least one surface.
By using the moire suppressing film of such an aspect, the usability is improved, and the gap between the first pattern structure layer-containing optical member and the second pattern structure layer-containing optical member is firmly maintained. be able to.

Another aspect of the present invention is a moire suppressing film laminate comprising any one of the above moire suppressing films, wherein a particle-dispersed light diffusion layer is provided on at least one surface of the moire suppressing film. Is preferred.
By using a moire suppressing film composed of a light diffusion layer having such an internal refractive index distribution structure and a particle dispersion type light diffusion layer, the moire suppressing property and contrast can be adjusted more finely. As a result, the overall manufacturing cost and the like are reduced, which is economically advantageous.
Further, by using a particle-dispersed light diffusing layer having a predetermined thickness in combination, the entire light diffusing layer can be formed corresponding to the gap between the first pattern structure layer-containing optical member and the second pattern structure layer-containing optical member. There is also an advantage that the thickness can be easily adjusted to an appropriate thickness.

Further, another aspect of the present invention is a moire suppressing film laminate comprising a first moire suppressing film and a second moire suppressing film, which suppresses a moire phenomenon caused by a difference between two spatial frequencies, The first moire suppressing film and the second moire suppressing film have a plurality of columnar objects made of a material having a relatively high refractive index in a region having a relatively low refractive index made of a single layer, The angle formed between the MD direction of the first moire suppressing film and the MD direction of the second moire suppressing film is a value within a range of 1 to 179 °, and is defined by the relational expression (1). A moiré suppression film laminate, wherein the straight transmittance of the moiré suppression film laminate is 8% or less.
In this way, even when there is a variation in the direction of light diffusivity by adjusting the angle between the MD direction of the first moire suppressing film and the MD direction of the second moire suppressing film, the variable angle haze value is obtained. Can be controlled more finely, and moiré suppression can be more effectively exhibited.

Another aspect of the present invention is arranged between at least the first pattern structure layer-containing optical member and the second pattern structure layer-containing optical member, and suppresses the moire phenomenon caused by the difference between the two spatial frequencies. The moiré suppressing film has a plurality of columnar objects made of a material having a relatively high refractive index in a region having a relatively low refractive index made of a single layer. The composite display device is characterized in that the straight transmittance of the moire suppressing film defined by the relational expression (1) is 8% or less.
By making a moiré suppressing film having such an internal refractive index distribution structure or the like a composite display device used between the first pattern structure layer-containing optical member and the second pattern structure layer-containing optical member, Good moire suppression is obtained, and in addition, there is little backscattering and a high-contrast image or the like can be visually recognized.

FIG. 1 is a schematic perspective view of a moire suppressing film. 2A to 2C are vertical sectional views of the moire suppressing film. FIG. 3 is a diagram provided for explaining the relationship between the moire evaluation (relative value) of the moire suppressing film and the straight transmission rate (Lp / Lo × 100) (%). FIGS. 4A to 4B are views provided to explain the moire suppressing film laminate (first moire suppressing film laminate). FIG. 5 is a diagram for explaining the effect of the moire suppressing film laminate (first moire suppressing film laminate). FIG. 6 is a diagram provided for explaining another moire suppressing film laminate (second moire suppressing film laminate). Drawing 7 (a)-(b) is a figure offered in order to explain the effect of another moire control film layered product (second moire control film layered product). FIG. 8 is a diagram for explaining a composite display device using a moire suppressing film. It is a figure (photograph) which shows the grade of the backscattering in a moire suppression film and a moire suppression film laminated body.

[First Embodiment]
As shown in FIGS. 1 and 2A to 2C, the first embodiment is a moiré suppression film that suppresses a moiré phenomenon caused by a difference between two spatial frequencies, and has a single layer refractive index. Has a plurality of columns made of a material having a relatively high refractive index so as to extend in the thickness direction, and is defined by the following relational expression (1). The moire suppressing film 10 is characterized in that the straight transmittance of the moire suppressing film is 8% or less.
Straight transmittance (%) = Lp / Lo × 100 (1)
(Lp: Brightness of transmitted light (cd / m ² ) measured with a moire suppression film sandwiched between two polarizing plates arranged in a parallel Nicol state, Lo: two sheets arranged in a parallel Nicol state Brightness of transmitted light (cd / m ² ) measured only on the polarizing plate

1 is a three-dimensional perspective view of the moire suppressing film 10, FIG. 2 (a) is a vertical sectional view of the moire suppressing film 10, and FIG. 2 (b) is peeled off on one side of the moire suppressing film. FIG. 2C is a vertical cross-sectional view of an example provided with a film 16, and FIG. 2C shows a vertical cross-sectional view of an example provided with release films 16a and 16b on both surfaces of the moire suppressing film 10.
Hereinafter, the moire suppressing film 10 according to the first embodiment of the present invention will be specifically described with reference to the drawings as appropriate.

1. Basic Structure As shown in FIGS. 1 and 2A to 2C, the moire suppressing film 10 has an internal refractive index distribution structure composed of a single layer as a basic structure, and the refractive index is included in the single layer. Has a structure having a low refractive index region 14 having a relatively low refractive index and a plurality of columnar objects 12 made of a material having a relatively high refractive index.
That is, as shown in FIG. 2 (a), the columnar object 12 having a relatively high refractive index is placed at a predetermined interval (t3) inside the low refractive index region 14 having a relatively low refractive index around it. ) And is in a standing state.
As a result, the effect as a light diffusion film can be exhibited. When the incident light is within the light diffusion incident angle region, it is sufficiently diffused along the traveling direction, while outside the light diffusion incident angle region. In this case, the plurality of columnar objects are transmitted as they are along the traveling direction, or weaker diffusion than in the light diffusion incident angle region is exhibited.

Therefore, such a predetermined incident light is diffused and transmitted, and the predetermined incident light is transmitted as it is, or a so-called phase separation type light diffusion film having an internal refractive index distribution structure that diffuses and transmits light weakly. If it is, it can be used suitably.
More specifically, a simple column structure (see FIG. 1 and the like), a column structure having a bent portion, a column structure / column structure combination structure having an overlapping structure in a single layer, and a combination structure of a simple column structure consisting of a plurality of layers ( If it is at least one, such as FIG. 6 etc., it can be used as a moire suppressing film that can sufficiently suppress the moire phenomenon caused by the difference between the two spatial frequencies and obtain a high-contrast image display device. .

2. Columns having a relatively high refractive index (1) High refractive index portion Further, a high refractive index portion (hereinafter simply referred to as a high refractive index portion) that is a columnar material having a relatively high refractive index in the low refractive index region. Although the kind of material substance for constituting is not particularly limited, usually, as a main component thereof, a (meth) acrylic acid ester polymer containing a plurality of aromatic rings and It is preferable to do.
This is because, with such a material substance, not only can the high refractive index portion be efficiently formed, but also the incident angle dependency and the opening angle of the diffused light derived from the high refractive index portion can be further improved. This is because it can.
That is, by using a specific (meth) acrylic acid ester polymer as the main component of the high refractive index portion (hereinafter, also referred to as the (A1) component), by photopolymerization by irradiation with active energy rays ( The polymerization rate of the monomer component (hereinafter referred to as “monomer (A1) component”) as the component (A1) is the main component of the low refractive index portion (hereinafter sometimes referred to as “component (B1)”). This is because it is estimated that the polymerization rate of the monomer component (hereinafter sometimes referred to as the monomer (B1) component) can be increased.
Then, a predetermined difference is caused in the polymerization rate between these monomer components, and both monomer components are prevented from being uniformly copolymerized, and more specifically, the compatibility of both monomer components is kept within a predetermined range. It is estimated that the copolymerizability between the two monomer components can be effectively lowered by so-called phase separation.

  Examples of the (meth) acrylic acid ester containing a plurality of aromatic rings as the monomer (A1) component include, for example, biphenyl (meth) acrylate, naphthyl (meth) acrylate, anthracyl (meth) acrylate, ( Benzylphenyl methacrylate, biphenyloxyalkyl (meth) acrylate, naphthyloxyalkyl (meth) acrylate, anthracyloxyalkyl (meth) acrylate, benzylphenyloxyalkyl (meth) acrylate, or the like Mention may be made of at least one compound partially substituted by halogen, alkyl, alkoxy, alkyl halide or the like.

  The (meth) acrylic acid ester containing a plurality of aromatic rings as the monomer (A1) component preferably contains a compound containing a biphenyl ring, and in particular, a biphenyl compound represented by the following general formula (1): It is preferable to include.

(In the general formula (1), R1 to R10 are independent of each other, and at least one of R1 to R10 is a substituent represented by the following general formula (2), the rest being a hydrogen atom, a hydroxyl group, It is a substituent of any one of a carboxyl group, an alkyl group, an alkoxy group, a halogenated alkyl group, a hydroxyalkyl group, a carboxyalkyl group and a halogen atom.)

(In general formula (2), R11 is a hydrogen atom or a methyl group, carbon number n is an integer of 1 to 4, and repetition number m is an integer of 1 to 10.)

The reason for this is that by using a biphenyl compound having a specific structure as the monomer (A1) component, the polymerization rate of the monomer (A1) component can be made faster than the polymerization rate of the monomer (B1) component. This is because it is estimated.
In addition, it is estimated that the compatibility with the monomer (B1) component can be more easily lowered to a predetermined range, and the refractive index of the region derived from the (A1) component is increased, and as a result , (B1) The difference from the refractive index of the region derived from the component can be easily adjusted to a value equal to or greater than a predetermined value.
Furthermore, if it is a biphenyl compound having a specific structure, it is liquid at the monomer stage before photocuring, and urethane (meth) acrylate, which is a representative example of the monomer (B1) component, without using a diluent solvent There is also an advantage that they can be mixed uniformly.

Further, the substituents R ¹ to R ¹⁰ in the general formula (1) is an alkyl group, an alkoxy group, a halogenated alkyl group, a hydroxyalkyl group, and if it contains any of carboxyalkyl groups, the carbon of the alkyl moiety The number is preferably set to a value within the range of 1 to 4.
This is because when the number of carbon atoms exceeds 4, the polymerization rate of the monomer (A1) component decreases, or the refractive index of the region derived from the (A1) component becomes too low. This is because it may be difficult to efficiently form the columnar object.
Therefore, when the substituents R ^{1 to} R ¹⁰ in the general formula (1) include any one of an alkyl group, an alkoxy group, a halogenated alkyl group, a hydroxyalkyl group, and a carboxyalkyl group, the carbon of the alkyl portion. The number is more preferably a value within the range of 1 to 3, and even more preferably a value within the range of 1 to 2.

Moreover, it is preferable that any one of R < ² > -R < ⁹ > in General formula (1) is a substituent represented by General formula (2).
The reason for this is that the position of the substituent represented by the general formula (2), by a position other than R1 and R ¹⁰ in the biphenyl ring, at the stage before photocuring, the monomer component (A1) to each other are oriented This is because crystallization can be effectively prevented.
As a result, the monomer (A1) component and the monomer (B1) component can be aggregated and phase-separated at a fine level in the photocuring stage. This is because can be obtained more efficiently.
Further, from the same viewpoint, it is particularly preferable that any one of R ³ , R ⁵ , R ⁶ and R ^{8 in} the general formula (1) is a substituent represented by the general formula (2).

Moreover, it is preferable to make the repeating number m in the substituent represented by General formula (2) into an integer of 1-10 normally.
The reason for this is that when the number of repetitions m exceeds 10, the oxyalkylene chain connecting the polymerization site and the biphenyl ring becomes too long, which may inhibit the polymerization of the monomer (A1) components at the polymerization site. Because there is.
Therefore, the repeating number m in the substituent represented by the general formula (2) is more preferably an integer of 1 to 4, and particularly preferably an integer of 1 to 2.
In addition, from the same viewpoint, it is preferable that the carbon number n in the substituent represented by the general formula (2) is usually an integer of 1 to 4.
In particular, from the viewpoint of preventing the position of the polymerizable carbon-carbon double bond, which is the polymerization site, from being too close to the biphenyl ring, the biphenyl ring becoming a steric hindrance, and the polymerization rate of the monomer (A1) component being lowered. The carbon number n in the substituent represented by the general formula (2) is more preferably an integer of 2 to 4, and further preferably an integer of 2 to 3.

  Specific examples of the biphenyl compound represented by the general formula (1) include compounds represented by the following formulas (3) to (4).

Moreover, it is preferable to make the weight average molecular weight of a monomer (A1) component into the value within the range of 200-2,500 normally.
This is because the monomer (A1) component and the monomer (B1) component are copolymerized by increasing the polymerization rate of the monomer (A1) component by setting the weight average molecular weight of the monomer (A1) component within a predetermined range. This is because it is estimated that the sex can be reduced more effectively.
As a result, when photocured, the columnar product in which the components (A1) and (B1) extend alternately along the film surface direction can be formed more efficiently.
That is, when the weight average molecular weight of the monomer (A1) component is less than 200, for example, the position of the plurality of aromatic rings and the position of the polymerizable carbon-carbon double bond are too close, and the polymerization rate is increased due to steric hindrance. This is because it may be lowered to be close to the polymerization rate of the monomer (B1) component, and copolymerization with the monomer (B1) component may easily occur.
On the other hand, when the weight average molecular weight of the monomer (A1) component exceeds 2,500, the polymerization rate of the monomer (A1) component decreases to approach the polymerization rate of the monomer (B1) component, and the monomer (B1) This is because it may be difficult to form the columnar material regularly as a result of easy copolymerization with the components.
Accordingly, the weight average molecular weight of the monomer (A1) component is more preferably set to a value within the range of 240 to 1,500, and further preferably set to a value within the range of 260 to 1,000.
The weight average molecular weight of the monomer (A1) component can be measured using gel permeation chromatography (GPC), or can be calculated from the structural formula based on the atomic weight of the constituent atoms. .

(2) Maximum diameter Moreover, as shown to Fig.2 (a), in the moire suppression film 10, setting the maximum diameter (t2) in the vertical cross section of the columnar thing 12 to the value within the range of 0.1-15 micrometers. preferable.
This is because, by setting the maximum diameter to a value in the range of 0.1 to 15 μm, the incident light is more stably reflected in the column structure as the moire suppressing film, and is incident from the moire suppressing film. This is because the angle dependency and the opening angle of the diffused light can be further improved.
That is, if the maximum diameter is less than 0.1 μm, it may be difficult to exhibit light diffusibility regardless of the incident angle of incident light.
On the other hand, when the maximum diameter exceeds 15 μm, the light traveling straight in the column structure increases, and the uniformity of light diffusion may deteriorate.
Therefore, in the moire suppressing film, the maximum diameter in the cross section of the columnar material is more preferably set to a value within the range of 0.5 to 10 μm, and further preferably set to a value within the range of 1 to 5 μm.
The horizontal cross-sectional shape of the columnar object is not particularly limited, but is preferably a circle, an ellipse, a polygon, an irregular shape, or the like.
Moreover, the horizontal cross section of a columnar thing means the cross section cut | disconnected by the surface parallel to the film surface.
Note that the maximum diameter (t2) and length (t1) of the columnar object or the interval (t3) between adjacent columnar objects can be calculated by observing with an optical digital microscope and measuring with reference to the scale. it can.

(3) Length of columnar object Moreover, as shown to Fig.2 (a), in the moire suppression film 10, it is preferable to make the length (t3) of a columnar object into the value within the range of 5-495 micrometers. In addition, the said length means the length of the thickness direction of the part in which the columnar object is formed.
The reason for this is that if the length of the columnar material is less than 5 μm, the length of the columnar material is insufficient and incident light that goes straight through the column structure increases, and sufficient incident angle dependence and diffusion are achieved. This is because it may be difficult to obtain the opening angle of light.
On the other hand, when the length of the columnar material exceeds 495 μm, when the column structure is formed by irradiating the active energy ray to the composition for moire suppression film, This is because the progress direction of the polymerization is diffused and it may be difficult to form a desired column structure.
Therefore, in the moire suppressing film, the length of the columnar body is more preferably set to a value within the range of 40 to 310 μm, and further preferably set to a value within the range of 95 to 255 μm.
In addition, although the length (t3) of a columnar thing can be generally regarded as the thickness of a moire suppression film, the non-formation area | region of a columnar thing may be formed in the single side | surface or both surfaces of a moire suppression film. .
Therefore, when the non-formation region of the columnar object is formed, the value obtained by subtracting the thickness from the thickness of the moire suppressing film is the length (t3) of the columnar object.

(4) Spacing between columnar objects As shown in FIG. 2A, in the moire suppressing film, the distance (t3) between adjacent columnar objects, that is, the distance between the centers of adjacent columnar objects is 0.1 to 10. A value in the range of 15 μm is preferable.
The reason for this is that by setting the interval to a value in the range of 0.1 to 15 μm, the incident light is more stably reflected in the column structure as the moire suppressing film, and the diffused light derived from the moire suppressing film. This is because the opening angle can be further improved.
That is, when the distance is less than 0.1 μm, it may be difficult to exhibit light diffusibility regardless of the incident angle of incident light.
On the other hand, when the distance exceeds 15 μm, the light traveling straight in the column structure increases, and the uniformity of light diffusion may deteriorate.
Therefore, in the moire suppressing film, the lower limit of the interval (t3) between the adjacent columnar objects is more preferably 0.5 μm or more, and further preferably 1 μm or more.
The upper limit of the interval (t3) between the adjacent columnar objects is more preferably 10 μm or less, and further preferably 5 μm or less.

(5) Inclination angle / bending structure In addition, although not shown, in the moire suppressing film, it is preferable that a plurality of columnar objects are forested at a constant inclination angle with respect to the film thickness direction.
The reason for this is that by making the inclination angle of the pillars constant, the incident light is more stably reflected in the column structure as the moire suppressing film, and the incident angle dependency and the diffusion light derived from the moire suppressing film are reduced. This is because the opening angle can be further improved.

In addition, although not shown in the figure, in the moire suppressing film, it is also preferable that one columnar object is bent at a predetermined angle in the middle.
This is because the columnar object is bent at a bending angle, thereby reducing the incident light that goes straight through the column structure and improving the uniformity of light diffusion.
In addition, such a bent columnar object is irradiated with active energy rays while changing the irradiation angle of the irradiation light, adding a small amount of an ultraviolet absorber, or an ultraviolet absorption filter. Can be obtained by irradiating with light.
The bending angle refers to an angle formed by the tangent line of the columnar object interface before the change and the tangent line of the columnar object interface after the change when the columnar object changes the extending direction in the thickness direction.

3. Region having a relatively low refractive index (1) Low refractive index portion In addition, a material for constituting a low refractive index portion that is a region having a relatively low refractive index around a columnar object having a relatively high refractive index. The type of the substance is not particularly limited, but it is preferable that the main component is a urethane (meth) acrylate polymer.
The reason for this is that if it is such a material substance, it is possible to efficiently form not only the low refractive index portion but also the columnar object that is a high refractive index portion derived from the (A1) component having a high refractive index. This is because the opening angle of the diffused light can be further improved.
That is, by making the component (B1), which is the main component of the low refractive index part, a polymer of urethane (meth) acrylate, the refractive index of the columnar material derived from the component (A1) and the component derived from the component (B1) Not only can the difference from the refractive index of the low refractive index portion be more easily adjusted, but also the internal refractive index provided with the predetermined columnar material by effectively suppressing the variation in the refractive index of the columnar material derived from the component (B1) This is because the distribution structure can be obtained more efficiently.
In addition, (meth) acrylate means both acrylate and methacrylate.

First, urethane (meth) acrylate as a monomer (B1) component is formed from (a) a compound containing at least two isocyanate groups, (b) polyalkylene glycol, and (c) hydroxyalkyl (meth) acrylate. It is preferable.
Among these, as the compound containing at least two isocyanate groups as component (a), for example, 2,4-tolylene diisocyanate, 2,6-tolylene diisocyanate, 1,3-xylylene diisocyanate Arocyclic polyisocyanates such as aromatic polyisocyanates such as 1,4-xylylene diisocyanate, aliphatic polyisocyanates such as hexamethylene diisocyanate, isophorone diisocyanate (IPDI), hydrogenated diphenylmethane diisocyanate, etc. Isocyanates and their biurets, isocyanurates, and adducts that are a reaction with low molecular weight active hydrogen-containing compounds such as ethylene glycol, propylene glycol, neopentyl glycol, trimethylolpropane, castor oil (for example, Xylylene diisocyanate Can be exemplified system trifunctional adduct) or the like.

Moreover, among the above-mentioned, it is preferable that it is an alicyclic polyisocyanate.
The reason for this is that the cycloaliphatic polyisocyanate is easier to provide a difference in the reaction rate of each isocyanate group than the aliphatic polyisocyanate due to the conformation and the like, and the resulting urethane (meta) This is because molecular design of acrylate becomes easy.
In particular, the component (a) is preferably an alicyclic diisocyanate.
This is because, for example, an alicyclic diisocyanate suppresses that the component (a) reacts only with the component (b) or the component (a) reacts only with the component (c). This is because the component (a) can be reliably reacted with the component (b) and the component (c), and generation of extra by-products can be prevented.
As a result, it is possible to effectively suppress variations in the refractive index in the low refractive index portion derived from the component (B1) in the internal refractive index distribution structure.

Moreover, if it is an alicyclic diisocyanate, compared with aromatic diisocyanate, the monomer (B1) component obtained, and the biphenyl compound which has a specific structure which is a typical example as a monomer (A1) component, Thus, the low refractive index portion can be formed more efficiently by reducing the compatibility to a predetermined range.
Furthermore, alicyclic diisocyanate is a typical example of the monomer (A1) component because the refractive index of the resulting monomer (B1) component can be reduced as compared with the aromatic diisocyanate. By increasing the difference from the refractive index of the biphenyl compound having a specific structure, it is possible to more efficiently form a columnar body having excellent incident angle dependency.
Among such alicyclic diisocyanates, isophorone diisocyanate (IPDI) is particularly preferable because of the large difference in reactivity between the two isocyanate groups.

Examples of the polyalkylene glycol as the component (b) include polyethylene glycol, polypropylene glycol, polybutylene glycol, polyhexylene glycol, polytetramethylene ether glycol, and the like. Particularly preferred.
This is because polypropylene glycol can be handled without a solvent because of its low viscosity.
Moreover, if it is a polypropylene glycol, when a monomer (B1) component is hardened, it will become a favorable soft segment in the said hardened | cured material, and the handling property and mounting property of a moire suppression film can be improved effectively. It is.
In addition, the weight average molecular weight of a monomer (B1) component can be adjusted with the weight average molecular weight of (b) component. Here, the weight average molecular weight of (b) component is 2,000-19,500 normally, Preferably it is 3,500-14,300, Especially preferably, it is 6,300-12,300.

Moreover, as hydroxyalkyl (meth) acrylate which is (c) component, for example, 2-hydroxyethyl (meth) acrylate, 2-hydroxypropyl (meth) acrylate, 3-hydroxypropyl (meth) acrylate, 2-hydroxybutyl (Meth) acrylate, 3-hydroxybutyl (meth) acrylate, 4-hydroxybutyl (meth) acrylate, etc. are mentioned.
Further, from the viewpoint of reducing the polymerization rate of the obtained urethane (meth) acrylate and more efficiently forming the predetermined low refractive index portion, hydroxyalkyl methacrylate is more preferable, and 2-hydroxyethyl methacrylate is more preferable. More preferably it is.

Moreover, the synthesis | combination of the urethane (meth) acrylate by (a)-(c) component can be implemented in accordance with a conventional method.
At this time, the blending ratio of the components (a) to (c) is preferably set to a ratio of (a) component: (b) component: (c) component = 1-5: 1: 1-5 in molar ratio. .
The reason for this is that by setting such a blending ratio, one isocyanate group of the component (a) reacts with and binds to two hydroxyl groups of the component (b), and two (a) This is because the urethane (meth) acrylate in which the hydroxyl group of the component (c) reacts with and bonds to the other isocyanate group of each component can be efficiently synthesized.
Therefore, the mixing ratio of the components (a) to (c) is more preferably set to a ratio of (a) component: (b) component: (c) component = 1-3: 1: 1-3 in molar ratio. Preferably, the ratio is 2: 1: 2.

Moreover, it is preferable to make the weight average molecular weight of a monomer (B1) component into the value within the range of 3,000-20,000.
This is because the monomer (B1) component has a weight average molecular weight of 3,000 or more, thereby causing a predetermined difference in the polymerization rate of the monomer (A1) component and the monomer (B1) component, and the copolymerization of both components. This is because it is estimated that the performance can be effectively reduced.
As a result, when the photocuring is performed, a high refractive index columnar material can be efficiently formed in the low refractive index portion by standing at predetermined intervals.
On the other hand, when the weight average molecular weight of the monomer (B1) component exceeds 20,000, the compatibility with the monomer (A1) component is excessively lowered, and the moire suppressing film composition is uniformly applied. This is because there are cases where it cannot be distributed.
Accordingly, the weight average molecular weight of the monomer (B1) component is more preferably set to a value within the range of 5,000 to 15,000, and further preferably set to a value within the range of 7,000 to 13,000. .
The weight average molecular weight of the monomer (B1) component can be measured using gel permeation chromatography (GPC), or can be calculated from the structural formula based on the atomic weight of the constituent atoms. .

  In addition, the monomer (B1) component may be used in combination of two or more different molecular structures and weight average molecular weights, but from the viewpoint of suppressing variation in the refractive index of the columnar material derived from the (B1) component in the columnar material. It is preferable to use only one type.

(2) Refractive index difference Moreover, it is preferable to make the difference of 0.01 or more into the difference of the refractive index of the columnar thing which is a high refractive index part, and the refractive index of the low refractive index area | region which is a low refractive index part.
The reason for this is that by setting the difference in refractive index to a value of 0.01 or more, the opening angle of diffused light derived from the film can be further improved in the column structure region of the moire suppressing film, and the incident light This is because a high haze value can be obtained by stably reflecting the light, and a low straight transmission rate and a low backscattering property can be obtained.
That is, when the difference in refractive index is less than 0.01, the angle range in which incident light is totally reflected in the column structure is narrowed, so that the opening angle of the diffused light is excessively narrowed and the moire suppressing effect is achieved. This is because there is a case in which the lowering may occur.
Therefore, the difference between the refractive index of the columnar object and the refractive index of the medium in the moire suppressing film is more preferably 0.05 or more, and further preferably 0.1 or more.
In addition, although the difference of refractive index is so preferable that it is large, from a viewpoint of selecting the material which can form a column structure, about 0.3 is considered to be an upper limit.

4). Thickness The thickness of the moire suppressing film is preferably set to a value within the range of 40 to 500 μm.
That is, by setting the value to 40 μm or more, the length of the columnar object along the film thickness direction is stably secured, and incident light is more stably reflected in the column structure region as a moire suppressing film. This is because the opening angle of the diffused light derived from the moire suppressing film can be further improved.

On the other hand, by setting the thickness to a value of 500 μm or less, a column structure having a columnar body having a uniform length in the thickness direction can be more easily formed.
Therefore, the lower limit of the thickness of the moire suppressing film is more preferably 60 μm or more, and further preferably 100 μm or more.
On the other hand, the lower limit of the thickness of the moire suppressing film is more preferably set to a value within a range of 350 μm, and further preferably set to a value of 260 μm or less.

5. Laminated type It is also preferable to laminate a plurality of moire suppressing films made of a single layer to form a laminated type.
For example, in order to control the variable angle haze value of the moire suppression film, the normal haze value, and further the overall thickness of the moire suppression film to a value within a predetermined range, a moire suppression film composed of two or more single layers, It is preferable to stack a plurality of sheets.
However, if it is laminated too much, the usability may be lowered or the total light transmittance may be lowered.
Therefore, when laminating a moiré suppressing film composed of a single layer, it is preferably a value within the range of 2 to 5, more preferably a value within the range of 2 to 4, and 2 or 3 More preferably.

6). Straight transmission (%)
The straight transmission rate of the moire suppressing film defined by the following relational expression (1) is set to a value of 8% or less.
Straight transmission rate = Lp / Lo × 100 (1)
(Lp: Brightness of transmitted light (cd / m ² ) measured with a moire suppression film sandwiched between two polarizing plates arranged in a parallel Nicol state, Lo: two sheets arranged in a parallel Nicol state Brightness of transmitted light (cd / m ² ) measured only on the polarizing plate

The reason for this is that, as shown in FIG. 3, when the straight transmittance of the moire suppressing film is set to a predetermined value or less, excellent moire suppressing properties can be obtained.
Therefore, in order to improve the moire suppression not only in the left-right direction (coincidence with the TD direction) of the moire suppression film but also in the vertical direction (coincidence with the MD direction), the straight transmission rate should be set to a value of 7% or less. Preferably, the value is 6% or less, more preferably 4% or less.
However, if the straight transmission rate of the moire suppressing film is excessively reduced, the selection range of usable resin materials may be excessively narrowed or the yield may be significantly reduced, which may be economically disadvantageous. .
Therefore, the lower limit of the straight transmittance of the moire suppressing film is more preferably 0.1% or more, further preferably 1% or more, and further preferably 2% or more.

7. Deflection haze value Deflection haze value of moire suppression film, that is, deflection haze value at ± 70 ° measured with a deflection haze meter (in an angle range of ± 70 ° with respect to the normal direction of the moire suppression film) Of the measured haze values, it means the lowest value, for example, the TD variable angle haze value is a film based on an axis extending in the MD direction with the incident light initially fixed in the normal direction of the film. Is rotated to -70 to 70 °, and the emitted light at each angle is collected by an integrating sphere, whereby the haze value at each incident angle is measured, and the minimum value is 70% or more. It is preferable.
This is because an excellent moire suppressing property can be obtained by setting the variable haze value to a predetermined value or more.

Therefore, the lower limit of the variable angle haze value of the moire suppressing film is more preferably 85% or more, and still more preferably 90% or more.
However, if the variable angle haze value of the moire suppressing film is excessively high, the range of selection of the resin constituting the moire suppressing film is excessively narrowed, the manufacturing yield is significantly reduced, and this is economically disadvantageous. Sometimes.
Therefore, the upper limit of the variable angle haze value of the moire suppressing film is more preferably 99% or less, and still more preferably 98% or more.

In addition, when only the haze value (normal haze value) measured in accordance with JIS K 7136: 2000 is considered in the moire suppressing film, the moire suppressing property may be insufficient.
However, the normal haze value of the moire suppressing film has an advantage that it can be measured relatively easily and in a short time.
Accordingly, it can be said that it is preferable to consider the haze value in combination with the normal haze value on the assumption that the variable haze value in the above-described moire suppressing film is taken into consideration.
Therefore, in the moire suppressing film, the lower limit of the normal haze value measured with a haze meter is preferably 85% or more, more preferably 90% or more, and 95% or more. More preferably.
On the other hand, from the viewpoint of production yield, the upper limit of the normal haze value is preferably 99% or less, more preferably 98% or less.

8). Manufacturing Method Next, typical forming methods (a) to (c) of the moire suppressing film will be described.
(A) A step of preparing a composition for a moire suppressing film (b) A step of applying a composition for a moire suppressing film to a process sheet and forming a coating layer (c) A gap lamination method for the coating layer And irradiating active energy rays of parallel light to form a columnar structure region in which a plurality of pillars having a relatively high refractive index are planted in a region having a relatively low refractive index.

(1) Process (a): Preparation process of the composition for moire suppression films Process (a) is a process of preparing the composition for moire suppression films.
More specifically, it is preferable to stir the monomer (A) component and the monomer (B) component under high temperature conditions of 40 to 80 ° C. to obtain a uniform mixed solution.
At the same time, other additives such as the component (C) described later are added to the mixed solution as desired, and then diluted as necessary to obtain a desired viscosity while stirring until uniform. It is preferable to obtain a solution of the composition for a moire suppressing film by further adding a solvent.
In addition, a monomer (A) component becomes a main component which comprises the high refractive index part in a moire suppression film by superposing | polymerizing. A monomer (B) component becomes a main component which comprises the low-refractive-index part in a moire suppression film by superposing | polymerizing.
Details of the types of the monomer (A) component and the monomer (B) component are described as the monomers (A1) and (A2) and the components (B1) and (B2) in the first embodiment, respectively. Since this is true, it is omitted.

Moreover, it is preferable to make the refractive index of a monomer (A) component into the value within the range of 1.5-1.65.
The reason for this is that by setting the refractive index of the monomer (A) component to a value within this range, the difference between the refractive index of the portion derived from the (A) component and the portion derived from the (B) component in the column structure. This is because the moire suppressing film having a predetermined column structure can be more efficiently obtained by adjusting the above.
That is, when the refractive index of the monomer (A) component is less than 1.5, the difference from the refractive index of the monomer (B) component becomes too small, making it difficult to obtain the desired incident angle dependency. This is because there are cases.
On the other hand, when the refractive index of the monomer (A) component exceeds 1.65, the difference from the refractive index of the monomer (B) component increases, but the viscosity decreases excessively, and the monomer (B) component This is because there is a case where it is difficult to achieve compatibility with.
Therefore, the refractive index of the component (A) is more preferably set to a value within the range of 1.55 to 1.6, and further preferably set to a value within the range of 1.56 to 1.59.
The above-described refractive index of the monomer (A) component means the refractive index of the monomer (A) component before being cured by light irradiation.
And the refractive index of a monomer (A) component can be measured according to JISK0062: 2000, for example.

Moreover, it is preferable to make content of a monomer (A) component into the value within the range of 25-400 weight part with respect to 100 weight part of monomer (B) components mentioned later.
The reason for this is that by setting the content of the monomer (A) component to a value within such a range, while maintaining the miscibility with the monomer (B) component, when irradiated with light, copolymerization of both components This is because the property can be effectively reduced and a predetermined column structure can be efficiently formed.
Therefore, the content of the monomer (A) component is more preferably set to a value within the range of 40 to 300 parts by weight, with respect to 100 parts by weight of the monomer (B) component, within the range of 50 to 200 parts by weight. More preferably, it is a value.

Moreover, it is preferable to make the refractive index of a monomer (B) component into the value within the range of 1.4-1.5.
The reason for this is that by setting the refractive index of the monomer (B) component to a value within this range, the difference between the refractive index of the portion derived from the (A) component and the portion derived from the (B) component in the column structure. This is because the moire suppressing film having a predetermined column structure can be more efficiently obtained by adjusting the above.
Accordingly, the refractive index of the monomer (B) component is more preferably set to a value in the range of 1.45 to 1.49, and further preferably set to a value in the range of 1.46 to 1.48.
The above-described refractive index of the monomer (B) component means the refractive index of the monomer (B) component before being cured by light irradiation.
And also about the refractive index of a monomer (B) component, it can measure according to JISK0062: 2000, for example.

Moreover, it is preferable to make content of a monomer (B) component into the value within the range of 20-80 weight% with respect to the whole quantity (100 weight%) of the composition for moire suppression films.
The reason for this is that when the content of the monomer (B) component is less than 20% by weight, the ratio of the monomer (B) component to the monomer (A) component decreases, resulting in the (B) component in the column structure. This is because, for example, the width of the formed portion is excessively small compared with the width of the portion derived from the component (A), and it may be difficult to obtain a column structure having a good incident angle dependency. . Moreover, it is because the length of the columnar thing in the thickness direction of a moire suppression film may become inadequate.
On the other hand, when the content of the monomer (B) component exceeds 80% by weight, the ratio of the monomer (B) component to the monomer (A) component is increased, resulting in the (B) component in the column structure. Since the width of the portion becomes excessively large compared to the width of the portion derived from the component (A), on the contrary, it may be difficult to obtain a column structure having a good incident angle dependency. It is. Moreover, it is because the length of the columnar thing in the thickness direction of a moire suppression film may become inadequate.
Therefore, it is more preferable to set the content of the monomer (B) component to a value within the range of 30 to 70% by mass, and within the range of 40 to 60% by mass with respect to the total amount of the composition for moire suppression film. More preferably, the value of

Moreover, in the composition for moire suppression films according to the present embodiment, it is preferable to contain a photopolymerization initiator as the component (C) as desired.
This is because a predetermined column structure can be efficiently formed when an active energy ray is irradiated to the composition for a moire suppressing film by containing a photopolymerization initiator.
Here, the photopolymerization initiator refers to a compound that generates radical species by irradiation with active energy rays such as ultraviolet rays.

Examples of the photopolymerization initiator include benzoin, benzoin methyl ether, benzoin ethyl ether, benzoin isopropyl ether, benzoin-n-butyl ether, benzoin isobutyl ether, acetophenone, dimethylaminoacetophenone, and 2,2-dimethoxy-2-phenylacetophenone. 2,2-diethoxy-2-phenylacetophenone, 2-hydroxy-2-methyl-1-phenylpropan-1-one, 1-hydroxycyclohexyl phenyl ketone, 2-methyl-1- [4- (methylthio) phenyl] -2-morpholino-propan-1-one, 4- (2-hydroxyethoxy) phenyl-2- (hydroxy-2-propyl) ketone, benzophenone, p-phenylbenzophenone, 4,4-diethyl Minobenzophenone, dichlorobenzophenone, 2-methylanthraquinone, 2-ethylanthraquinone, 2-tertiarybutylanthraquinone, 2-aminoanthraquinone, 2-methylthioxanthone, 2-ethylthioxanthone, 2-chlorothioxanthone, 2,4-dimethylthioxanthone, 2,4-diethylthioxanthone, benzyl dimethyl ketal, acetophenone dimethyl ketal, p-dimethylamine benzoate, oligo [2-hydroxy-2-methyl-1- [4- (1-methylvinyl) phenyl] propane and the like Of these, one type may be used alone, or two or more types may be used in combination.
In addition, as content in the case of containing a photoinitiator, it is set as the value within the range of 0.2-20 weight% with respect to 100 weight% of total amounts of a monomer (A) component and a monomer (B) component. It is preferable that the value be in the range of 0.5 to 15% by weight, more preferably 1 to 10% by weight.

In addition, other additives can be appropriately added within a range not impairing the effects of the present invention.
Examples of other additives include an antioxidant, an ultraviolet absorber, an antistatic agent, a polymerization accelerator, a polymerization inhibitor, an infrared absorber, a plasticizer, a diluting solvent, and a leveling agent.
In addition, generally content of another additive shall be a value within the range of 0.01 to 5 weight% with respect to 100 weight% of total amounts of a monomer (A) component and a monomer (B) component. Preferably, the value is in the range of 0.02 to 3% by weight, more preferably in the range of 0.05 to 2% by weight.

(2) Process (b): Application | coating process A process (b) is a process of apply | coating the prepared composition for moire suppression films with respect to a process sheet | seat, and forming an application layer.
Either a plastic film or paper can be used as the process sheet.
Among these, examples of the plastic film include polyester films such as polyethylene terephthalate films, polyolefin films such as polyethylene films and polypropylene films, cellulose films such as triacetyl cellulose films, and polyimide films.
Examples of the paper include glassine paper, coated paper, and laminated paper.

In addition, for the process sheet, a release layer is provided on the application surface side of the composition for the moire suppressing film in the process sheet in order to easily peel the obtained moire suppressing film from the process sheet after photocuring. Is preferred.
Such a release layer can be formed using a conventionally known release agent such as a silicone release agent, a fluorine release agent, an alkyd release agent, and an olefin release agent.
In addition, it is preferable that the thickness of a process sheet | seat is normally set to the value within the range of 25-200 micrometers.

Moreover, as a method of applying the composition for a moire suppressing film on a process sheet, for example, a conventionally known method such as a knife coating method, a roll coating method, a bar coating method, a blade coating method, a die coating method, and a gravure coating method Can be performed.
At this time, the thickness of the coating layer is preferably set to a value within the range of 100 to 700 μm.

(3) Active energy ray irradiation process 1 (gap lamination method)
In the step (c), the application layer is irradiated with an active energy ray of parallel light through a transparent release film, and a plurality of columnar shapes having a relatively high refractive index by a so-called gap lamination method. This is a step of forming a columnar structure region in which objects are forested.
That is, it is preferable to irradiate the coating layer formed on the process sheet with parallel light having a high degree of parallelism of light rays through the transparent release film.

Here, the parallel light means substantially parallel light that does not spread even when the direction of emitted light is viewed from any direction.
More specifically, for example, light from a point light source is converted into parallel light by a lens and then applied to a coating layer, or light from a linear light source is converted into parallel light by an aggregate of cylindrical objects, and then applied. It is preferable to irradiate the layer.
As a specific example of the parallel light irradiation device, for example, an ultraviolet spot light source “HYPERCURE 200” manufactured by Yamashita Denso Co., Ltd. and an optional uniform exposure adapter is attached.

And it is preferable to make the parallelism in parallel light into the value of 10 degrees or less with respect to the normal line of a coating layer.
The reason for this is that by setting the parallelism to a value of 10 ° or less, the column structure region as a moire suppressing film in which a plurality of columnar objects are erected at a constant inclination angle with respect to the film thickness direction can be efficiently used. This is because it can be manufactured stably and stably.
Accordingly, the parallelism of the parallel light is more preferably set to a value of 5 ° or less, more preferably a value of 2 ° or less, and most preferably a value of 1 ° or less.

Moreover, as irradiation light, an ultraviolet-ray, an electron beam, etc. are mentioned, However, It is more preferable to use an ultraviolet-ray.
Further, as the ultraviolet irradiation condition, the illuminance is preferably set to a value within the range of 0.01 to 30 mW / cm <2>.
This is because when the illuminance is less than 0.01 mW / cm 2, it may be difficult to clearly form the column structure. On the other hand, when the illuminance exceeds 30 mW / cm 2, it hardens before the phase separation of the component (A) and the component (B) proceeds, and conversely, it becomes difficult to clearly form the column structure. This is because there are cases.
Accordingly, the illuminance of ultraviolet rays is more preferably set to a value within the range of 0.05 to 20 mW / cm <2>, and further preferably set to a value within the range of 0.1 to 10 mW / cm <2>.
Further, the moving speed of the coating layer and the irradiation angle of the irradiation light can be the same as those in the first active energy ray irradiation step.

(4) Active energy ray irradiation process 2 (two-stage irradiation)
The step (c) is divided into two stages. First, as the step (c1 ′), the coating layer is irradiated with the first active energy ray, and a refractive index is formed as a first structural region in the lower part of the coating layer. In a relatively low area, a plurality of columnar objects having a relatively high refractive index form a columnar object area that is alternately arranged in parallel along the film surface direction, and is not formed in the upper part of the coating layer. It is preferable to leave the area.
That is, an active energy ray made of only direct parallel light whose irradiation angle is controlled, for example, ultraviolet rays, is applied to the coating layer formed on the process sheet.
Here, as an irradiation condition of ultraviolet rays, it is preferable to set the illuminance to a value within a range of 0.01 to 50 mW / cm ² .
This is because when the illuminance is less than 0.01 mW / cm ² , it may be difficult to clearly form the first structure region.
On the other hand, when the illuminance becomes a value exceeding 50 mW / cm ² , the composition hardens before the phase separation of the component (A) and the component (B) proceeds, and conversely, in the step (c2 ′) described later, This is because it may be difficult to clearly form the structure region.
Therefore, it is more preferably set to a value within the range illuminance of 0.05~20mW / cm ² of ultraviolet light, it is more preferably a value within the range of 0.1 to 10 MW / cm ^2.

Next, as a step (c2 ′), the coating layer is irradiated with a second active energy ray, and a refractive index is applied to a region having a relatively low refractive index as a second structural region in a lower portion of the coating layer. It is preferable to form a columnar region in which a plurality of relatively high columnar items are alternately arranged in parallel along the film surface direction.
Thus, it is preferable to form a moiré suppressing film having a lower moiré suppressing property and a lower straight transmittance by adopting a structure in which a so-called column structure / column structure is laminated in the vertical direction in a single layer.

(5) Formation of pressure-sensitive adhesive layer Although it is an optional step, a pressure-sensitive adhesive layer forming step is provided to adhere to at least one surface of the moire suppression film 10 as shown in FIGS. It is preferable to provide an agent layer (including an adhesive layer; hereinafter the same) 16, 16a, 16b.
The reason for this is that the use of the moire suppressing film of such an embodiment improves usability.
In addition, for example, the first pattern structure layer-containing optical member and the second pattern structure layer-containing optical member can be firmly fixed and arranged, and as a result, straight ahead represented by the relational expression (1) This is because the adjustment of the transmittance and the adjustment of the variable angle haze value can be further facilitated.

Moreover, as a kind of adhesive layer, when the usage method of a moire suppression film is considered, it is preferable to set it as the resin layer derived from the optical adhesive.
Therefore, the total light transmittance is preferably set to a value of 90% or more.
And when forming this adhesive layer, it is usually preferable to make the thickness into the value within the range of 1-500 micrometers, and it is more preferable to set it as the value within the range of 10-100 micrometers, 20-50 micrometers. A value within the range is more preferable.

[Second Embodiment]
Although 2nd Embodiment is a modification of the moire suppression film of 1st Embodiment, as shown to Fig.4 (a)-(b), the moire suppression film 10 which has an internal refractive index distribution structure, Moire suppressing film laminates 20 and 20 ′ obtained by laminating particle-dispersed light diffusion films 18.
More specifically, the moiré suppression film laminate 20 or 20 ′ that suppresses the moiré phenomenon caused by the difference between the two spatial frequencies, in the low refractive index region 14 having a relatively low refractive index composed of a single layer. In addition, a moire suppressing film 10 having a plurality of columnar bodies 12 made of a material having a relatively high refractive index, a particle-dispersed light diffusing film 18 in which particles 18a are dispersed in a resin component 18b, Is a moiré suppressing film laminate.
And the moire suppression film laminated body 20 and 20 '(Hereinafter, the moire suppression film laminated body of 3rd Embodiment) characterized by making the linear transmission represented by the relational expression (1) into the value of 8% or less (In some cases, the first moire suppressing film laminate may be referred to.)

FIG. 4A shows a moire suppressing film laminate 20 including a particle-dispersed light diffusion film 18 on one side of a moire suppressing film 10 having an internal refractive index distribution structure.
FIG. 4B shows a moiré suppressing film laminate 20 ′ provided with particle-dispersed light diffusion films 18 and 18 ′ on both surfaces of the moiré suppressing film 10 having an internal refractive index distribution structure.
Hereinafter, the moire suppressing film laminate according to the second embodiment of the present invention will be described with a focus on a particle-dispersed light diffusing film having a configuration greatly different from that of the first embodiment.

1. Moire suppression film having an internal refractive index distribution structure The moire suppression film having an internal refractive index distribution structure can be basically the same as the moire suppression film described in the first embodiment. The description of is omitted.

2. Particle-dispersed light diffusing film (1) particles The particles (light diffusing fine particles) to be blended in the particle-dispersed light diffusing film, when blended in the particle-dispersed light diffusing film, are used as a moire suppressing film laminate. Any mode may be used as long as the value can be improved.
Therefore, as such particles, for example, inorganic fine particles such as silica, calcium carbonate, aluminum hydroxide, magnesium hydroxide, clay, talc, titanium dioxide; organic type such as acrylic resin, polystyrene resin, polyethylene resin, epoxy resin, etc. Translucent fine particles; fine particles made of a silicon-containing compound having an intermediate structure between inorganic and organic such as silicone resin (for example, Tospearl series manufactured by Momentive Performance Materials Japan).
Among these, acrylic resin fine particles and fine particles made of a silicon-containing compound having an intermediate structure between inorganic and organic are preferable from the viewpoint of high definition of the pressure-sensitive adhesive layer.
In addition, fine particles made of a silicon-containing compound having an intermediate structure between inorganic and organic are particularly preferable because they exert their effect even when added in a small amount and the adhesiveness of the active energy ray-curable adhesive component is maintained well. . The above light diffusing fine particles may be used alone or in combination of two or more.

The shape of the particles is preferably spherical fine particles with uniform light diffusion.
And, since good light diffusibility and haze value can be obtained, the lower limit of the average particle diameter of such particles is preferably 1.0 μm or more, preferably 2.0 μm or more, Furthermore, the value is preferably 2.5 μm or more.
On the other hand, the upper limit of the average particle diameter of the particles is preferably 10 μm or less, more preferably 7 μm or less, and most preferably 5 μm or less.
This is because by setting the average particle size of such particles to a value within a predetermined range, good light diffusibility is obtained, while a predetermined haze value is obtained, and a moire suppressing effect is exhibited.
The average particle diameter of the particles can be directly measured using, for example, a caliper or a micrometer, but in accordance with JIS Z 8825: 2013, using a laser analyzer or the like, It can be measured as an arithmetic average value.

Moreover, it is preferable to make content of particle | grains into the value within the range of 0.1-30 mass parts normally with respect to 100 mass parts of resin components.
The reason for this is that when the content of such particles is less than 0.1 parts by mass, a desired haze value may not be obtained.
On the other hand, when the content of the particles exceeds 30 parts by mass, the particles are likely to aggregate, and handling may be difficult, or transparency may be excessively reduced.
Accordingly, the lower limit of the particle content is preferably 1 part by mass or more, more preferably 3 parts by mass or more.
Moreover, it is preferable to make the upper limit of content of particle | grains into the value of 20 mass parts or more, and it is still more preferable to set it as the value of 10 mass parts or more.

(2) Resin component Although it does not restrict | limit especially as a kind of resin component, From a viewpoint of making durability excellent, it is preferable to contain an active energy ray hardening adhesive component as a resin component.
That is, the active energy ray-curable adhesive component means a component that is cured by irradiation with active energy rays and exhibits adhesiveness. Therefore, it may be composed of a single curing component, or a component that is cured by irradiation with active energy rays and a component that is not cured by irradiation with active energy rays and exhibits tackiness may be included. .
More specifically, it is preferably an active energy ray-curable adhesive component containing the (meth) acrylic acid ester polymer shown below.

(2) -1 (meth) acrylic acid ester polymer As a monomer constituting the (meth) acrylic acid ester polymer, the alkyl group is derived from a (meth) acrylic acid alkyl ester having 1 to 20 carbon atoms, Preferred adhesiveness can be expressed.
Examples of the (meth) acrylic acid alkyl ester having 1 to 20 carbon atoms in the alkyl group include, for example, methyl (meth) acrylate, ethyl (meth) acrylate, propyl (meth) acrylate, and (meth) acrylic acid n-. Butyl, n-pentyl (meth) acrylate, n-hexyl (meth) acrylate, 2-ethylhexyl (meth) acrylate, isooctyl (meth) acrylate, n-decyl (meth) acrylate, (meth) acrylic acid Examples include n-dodecyl, myristyl (meth) acrylate, palmityl (meth) acrylate, stearyl (meth) acrylate, and the like. Among these, from the viewpoint of further improving the adhesiveness, (meth) acrylic acid esters having 1 to 8 carbon atoms in the alkyl group are preferable, and n-butyl (meth) acrylate or 2-ethylhexyl (meth) acrylate is particularly preferable. .

And it is preferable to make the weight average molecular weight of a (meth) acrylic acid ester polymer into the value within the range of 102 million normally.
The reason for this is that if the weight average molecular weight of the (meth) acrylic acid ester polymer exceeds 2 million, the coating strength of the resulting pressure-sensitive adhesive may become excessively high or the manufacturing time may become excessively long. Because.
On the other hand, when the weight average molecular weight of the (meth) acrylic acid ester polymer is less than 100,000, the resulting adhesiveness is remarkably lowered, or the amount of unreacted monomer is increased, making handling difficult. This is because there are cases.
Therefore, the lower limit of the weight average molecular weight of the (meth) acrylic acid ester polymer is more preferably 200,000 or more, and further preferably 300,000 or more.
On the other hand, the upper limit of the weight average molecular weight of the (meth) acrylic acid ester polymer is preferably 1 million or less, and more preferably 800,000 or more.
In addition, the weight average molecular weight of a (meth) acrylic acid ester polymer can be measured as a standard polystyrene conversion value by a gel permeation chromatography (GPC) method.

(2) -2 (Meth) acrylic acid ester polymer having a reactive group in the molecule The (meth) acrylic acid ester polymer as the main component of the resin component described above is a monomer unit constituting the polymer, It is preferable to have in the molecule a reactive group that reacts with the crosslinking agent (C) described later.
The reason for this is that by having a reactive group derived from a reactive group-containing monomer, it reacts with a crosslinking agent to form a crosslinked structure (three-dimensional network structure), and a resin component having a high cohesive force is obtained. .

Here, in order to introduce a reactive group into the molecule, the reactive group-containing monomer used when polymerizing the (meth) acrylate polymer is a monomer having a hydroxyl group in the molecule (hydroxyl group-containing monomer), molecule Preferred examples include a monomer having a carboxy group (carboxy group-containing monomer) and a monomer having an amino group in the molecule (amino group-containing monomer).
Among these, a hydroxyl group-containing monomer that is excellent in reactivity with the crosslinking agent and has little adverse effect on the adherend is particularly preferable.
More specifically, examples of the hydroxyl group-containing monomer include 2-hydroxyethyl (meth) acrylate, 2-hydroxypropyl (meth) acrylate, 3-hydroxypropyl (meth) acrylate, and (meth) acrylic. Examples include (meth) acrylic acid hydroxyalkyl esters such as 2-hydroxybutyl acid, 3-hydroxybutyl (meth) acrylate, and 4-hydroxybutyl (meth) acrylate.

(2) -3 Active energy ray-curable compound The active energy ray-curable compound contained in the resin component described above may be any monomer as long as the durability and cohesion of the obtained resin component are increased to a desired level. Any of oligomers and polymers, or a mixture thereof may be used.
Among them, a polyfunctional acrylate monomer excellent in compatibility with a (meth) acrylic acid ester polymer suitable as a resin component can be preferably exemplified.
Therefore, in the resin component, the active energy ray-curable compound forms a chemical bond with each other when irradiated with the active energy ray, thereby generating a three-dimensional network structure. Then, by capturing the (meth) acrylic acid ester polymer in the structure, the cohesive force is improved, and as a result, the durability is excellent.

  Here, as a polyfunctional acrylate monomer, for example, 1,4-butanediol di (meth) acrylate, 1,6-hexanediol di (meth) acrylate, neopentyl glycol di (meth) acrylate, polyethylene glycol di ( (Meth) acrylate, neopentyl glycol adipate di (meth) acrylate, hydroxypivalate neopentyl glycol di (meth) acrylate, dicyclopentanyl di (meth) acrylate, caprolactone modified dicyclopentenyl di (meth) acrylate, ethylene oxide modified phosphorus 2 kinds of acid di (meth) acrylate, ethylene oxide modified isocyanuric acid di (meth) acrylate, di (acryloxyethyl) isocyanurate, allylated cyclohexyl di (meth) acrylate, etc. Type: Trimethylolpropane tri (meth) acrylate, dipentaerythritol tri (meth) acrylate, propionic acid modified dipentaerythritol tri (meth) acrylate, pentaerythritol tri (meth) acrylate, propylene oxide modified trimethylolpropane tri (meth) Trifunctional type such as acrylate, tris (acryloxyethyl) isocyanurate, ε-caprolactone modified tris- (2- (meth) acryloxyethyl) isocyanurate, ethylene oxide modified isocyanuric acid tri (meth) acrylate; diglycerin tetra (meta ) Tetrafunctional type such as acrylate, pentaerythritol tetra (meth) acrylate; pentafunctional type such as propionic acid-modified dipentaerythritol penta (meth) acrylate; dipenta Examples thereof include hexafunctional types such as erythritol hexa (meth) acrylate and caprolactone-modified dipentaerythritol hexa (meth) acrylate. Among these, those having a relatively low weight average molecular weight of 1000 or less are more preferable. These may be used individually by 1 type and may be used in combination of 2 or more type.

  The content of the active energy ray-curable compound is preferably 1 part by mass or more, particularly preferably 3 parts by mass or more, based on 100 parts by mass of the (meth) acrylic ester polymer. Is preferably 5 parts by mass or more. Further, the content of the active energy ray-curable compound (B) is preferably 30 parts by mass or less, more preferably 25 parts by mass or less, particularly preferably 20 parts by mass or less, and further It is preferable that it is 10 mass parts or less. When the content of the active energy ray-curable compound (B) is within the above range, the resulting pressure-sensitive adhesive is superior in durability, and the resulting light diffusion pressure-sensitive adhesive layer 21 has excellent handling properties. It will be. Furthermore, the adhesiveness by the (meth) acrylic acid ester polymer is maintained well.

(2) -4 Crosslinking agent The resin component (before curing) constituting the particle-dispersed light diffusing film contains a crosslinking agent for crosslinking the (meth) acrylate polymer having a reactive group in the molecule. It is preferable.
The reason is that when the resin component is heated, the crosslinking agent reacts with the (meth) acrylic acid ester polymer having a reactive group in the molecule, and the cohesive force of the resulting resin component is improved.

Here, as a crosslinking agent, what is necessary is just to react with the reactive functional group which (meth) acrylic acid ester polymer has, for example, an isocyanate type crosslinking agent, an epoxy type crosslinking agent, an amine type crosslinking agent, a melamine type | system | group. Crosslinking agents, aziridine crosslinking agents, hydrazine crosslinking agents, aldehyde crosslinking agents, oxazoline crosslinking agents, metal alkoxide crosslinking agents, metal chelate crosslinking agents, metal salt crosslinking agents, ammonium salt crosslinking agents, etc. .
When the (meth) acrylic acid ester polymer has a hydroxyl group as a reactive functional group, among them, it is preferable to use an isocyanate-based crosslinking agent that is excellent in reactivity with the hydroxyl group. In addition, a crosslinking agent can be used individually by 1 type or in combination of 2 or more types.

Moreover, it is preferable that an isocyanate type crosslinking agent contains a polyisocyanate compound at least.
Examples of such polyisocyanate compounds include aromatic polyisocyanates such as tolylene diisocyanate, diphenylmethane diisocyanate, and xylylene diisocyanate, aliphatic polyisocyanates such as hexamethylene diisocyanate, isophorone diisocyanate, and hydrogenated diphenylmethane diisocyanate. Polyisocyanates and the like, and biurets, isocyanurates, and adducts that are a reaction product with a low molecular active hydrogen-containing compound such as ethylene glycol, propylene glycol, neopentyl glycol, trimethylolpropane, castor oil, etc. Can be mentioned. Among these, trimethylolpropane-modified aromatic polyisocyanate, particularly trimethylolpropane-modified tolylene diisocyanate is preferable from the viewpoint of reactivity with hydroxyl groups.
Moreover, it is preferable that it is 0.01-10 mass parts with respect to 100 mass parts of (meth) acrylic acid ester polymers, and, as for content of a crosslinking agent, it is especially preferable that it is 0.05-5 mass parts. Furthermore, it is preferable that it is 0.1-1 mass part.

(2) -5 Various additives The active energy ray-curable adhesive component may be various additives, for example, a photopolymerization initiator, a silane coupling agent, a refractive index adjusting agent, an antistatic agent, a tackifier, and an antioxidant, if desired. It is also preferable to add an agent, an ultraviolet absorber, a light stabilizer, a softener, a filler and the like.

(3) Thickness The thickness of the particle-dispersed light diffusing film can be appropriately changed according to the application and various purposes, but it is usually preferable to set the thickness within a range of 5 to 200 μm.
This is because, when the thickness of the particle-dispersed light diffusing film is 5 μm, handling may become difficult and a lamination effect (haze value increasing effect) may not be observed.
On the other hand, when the thickness of the particle-dispersed light diffusing film exceeds 200 μm, the value of the straight-ahead transmittance may be abruptly decreased or the ratio of backscattering may be excessively increased.
Accordingly, the lower limit of the thickness of the particle-dispersed light diffusion film is more preferably 10 μm or more, and more preferably 20 μm or more.
On the other hand, the upper limit of the thickness of the particle-dispersed light diffusion film is more preferably set to 150 μm or less, and further preferably set to 100 μm or less.

(4) Manufacturing method The particle-dispersed light diffusing film uniformly mixes and disperses a predetermined amount of predetermined particles in the resin component before curing, and then forms a coating film, which is further irradiated with active energy rays such as ultraviolet rays. By doing so, it can be manufactured.

(5) Normal haze value The normal haze value of the particle-dispersed light diffusing film alone, that is, the haze value measured in accordance with JIS K 7136: 2000 is preferably 5% or more.
The reason for this is that by setting the normal haze value of the particle-dispersed light diffusing film alone to a predetermined value or more and taking it into consideration with the value of the variable angle haze value, further excellent moire suppression is obtained. Because.
Therefore, the lower limit of the normal haze value of the particle-dispersed light diffusion film alone is more preferably 20% or more, and further preferably 50% or more.
However, if the upper limit of the normal haze value of the particle-dispersed light diffusing film alone is excessively increased, the production yield may be significantly reduced.
Therefore, the upper limit of the normal haze value of the particle-dispersed light diffusion film alone is preferably 95% or less, more preferably 90% or less, and even more preferably 88% or less. .

3. Effect According to the moire suppressing film laminate 20, the lamination effect of the particle-dispersed light diffusion film alone with respect to the variable haze value as shown in FIG. 5 can be obtained.
That is, the line A in FIG. 5 is a chart showing the variable angle haze value in the MD direction of the moire suppressing film (single layer) according to Example 1 described later.
Moreover, the line B in FIG. 5 is a chart which shows the variable angle haze value of the MD direction of the moire suppression film laminated body based on Example 6 mentioned later. More specifically, a moire suppressing film laminate in which a particle-dispersed light diffusing film alone (usually haze value: 20%) is laminated on a moire suppressing film (single layer) based on Example 1 described later. It is a chart which shows a variable angle haze value.
By comparing the line B with the line A, etc., by laminating a predetermined particle-dispersed light diffusion film (normal haze value: 20%), the variable angle haze value is reduced from 81.0% to 84.8%. It is understood that it can be adjusted.

Moreover, the line C in FIG. 5 is a chart which shows the variable angle haze value of the MD direction of the moire suppression film laminated body based on Example 7 mentioned later. More specifically, a moire suppressing film laminate obtained by laminating a single particle dispersion type light diffusion film (usually haze value: 40%) on a moire suppressing film (single layer) based on Example 1 described later. It is a chart which shows the variable angle haze value.
From this line C and the like, it is understood that the variable angle haze value can be adjusted from 81.0% to 86.3% by laminating a predetermined particle-dispersed light diffusion film alone (normal haze value: 40%). .

Moreover, the line D in FIG. 5 is a chart which shows the variable angle haze value of the MD direction of the moire suppression film laminated body based on Example 8 mentioned later. More specifically, a moire suppressing film laminate obtained by laminating a single particle-dispersed light diffusion film (usually haze value: 60%) on a moire suppressing film (single layer) based on Example 1 described later. It is a chart which shows a variable angle haze value.
From this line D and the like, it is understood that the variable angle haze value can be adjusted from 81.0% to 90.2% by laminating a predetermined particle-dispersed light diffusion film (normal haze value: 60%). .
Therefore, according to the moire suppressing film laminate 20, 20 ′ formed by laminating a predetermined particle-dispersed light diffusion film on the moire suppressing film, the value of the variable angle haze value is leveled economically. The value can be within a predetermined range.

[Third Embodiment]
As shown in FIG. 6, the third embodiment includes a first moire suppression film 10a and a second moire suppression film 10b that suppress a moire phenomenon caused by a difference between two spatial frequencies. This is a laminate 30.
The first moire suppressing film 10a and the second moire suppressing film 10b are each composed of a plurality of low refractive index regions 14 having a relatively low refractive index and materials having a relatively high refractive index in a single layer. Columnar body 12.
And it has laminated | stacked so that the angle which MD direction of the 1st moire suppression film 10a and MD direction of the 2nd moire suppression film 10b may become the value within the range of 1-179 degrees. The moiré suppressing film laminate 30 is a moiré suppressing film laminate 30 and has a linear transmittance expressed by the relational expression (1) of the moiré suppressing film laminate 30 of 8% or less. 30 (hereinafter, sometimes referred to as a second moire suppressing film laminate in order to be distinguished from the moire suppressing film laminate of the second embodiment).
By configuring the moiré suppressing film laminate 30 in this way, the characteristic variation such as the normal haze value in the MD direction or the like is absorbed, and the straight transmission rate and the variable angle haze value represented by the relational expression (1) are adjusted. Etc. can be made finer and easier, and a predetermined moire suppressing effect can be exhibited.
Hereinafter, the moire suppressing film laminate according to the third embodiment of the present invention will be specifically described with reference to the drawings as appropriate.

1. Basic Configuration The advancing direction of the manufacturing process of the first moire suppressing film 10a is the MD direction, and the advancing direction (MD direction) of the manufacturing process of the first moire suppressing film 10a is the direction intersecting the horizontal and vertical directions as the TD direction. In this case, in particular, the value of the variable angle haze based on the internal refractive index distribution structure may be different in the MD direction (see FIG. 7B, dotted line A (MD direction) and solid line B (TD direction)). ).
This is presumably due to variations in the irradiation amount of the active energy rays irradiated to both end portions in the direction of the manufacturing process (MD direction).
Therefore, by laminating the crossing angle between the MD direction of the first moire suppressing film and the MD direction of the second moire suppressing film to be a value within a range of 1 to 179 °, the width of the moire suppressing film. Variation in direction haze is reduced (see FIG. 7 (a), solid line C); lamination is performed so that the crossing angle is 90 °, and changes in the TD direction and MD direction of the first moire suppression film standard are performed. It shows angular haze, both of which show overlapping behavior).
Therefore, it is more preferable to laminate the crossing angle between the MD direction of the first moire suppressing film and the MD direction of the second moire suppressing film so as to have a value within a range of 30 to 150 °. It is more preferable to laminate so as to have a value within the range of 60 to 120 °, and most preferable to laminate so that the crossing angle is within the range of 80 to 100 °, for example, 90 °.

2. MD direction of 1st and 2nd moire suppression film MD direction of the 1st and 2nd moire suppression film means the advancing direction of the process of manufacture of a moire suppression film.
That is, since the MD direction of the moire suppressing film is continuously conveyed during manufacturing, it is easily affected by slight angle changes and parallelism changes. Therefore, when the angle is changed between the MD direction and the TD direction, a direction having a large haze value variation can be easily determined visually as the MD direction.
In order to produce a moire suppressing film so that the MD direction of the moire suppressing film can be easily determined, it is also preferable to simultaneously expose an identification mark such as an arrow when irradiating active energy rays.

3. Effect Therefore, in consideration of the intersection angle between the MD direction of the first moire suppressing film and the MD direction of the second moire suppressing film, the two layers are laminated in the direction indicated by the arrow A in FIG. As shown in FIG. 7 (a), values such as the variable angle haze in the MD and TD directions can be averaged and adjusted to a high value.

[Fourth Embodiment]
The fourth embodiment includes a plurality of at least a first pattern structure layer-containing optical member 54 and a second pattern structure layer-containing optical member 58 from below along the arrow A shown in FIG. The composite display device 100 includes a moire suppression film 10 that is disposed between the pattern structure layer-containing optical members and suppresses a moire phenomenon caused by a difference between two spatial frequencies.
The moire suppressing film 10 has a plurality of columnar objects made of a material having a relatively high refractive index in a region having a relatively low refractive index made of a single layer, and the relational expression (1). The composite display device 100 is characterized in that the straight-line transmittance of the moiré suppressing film represented by the formula is set to a value of 8% or less.
Hereinafter, the composite display device 100 according to the fourth embodiment will be described more specifically with reference to the drawings as appropriate.

1. Basic composition A composite comprising a moire suppressing film that is disposed between at least the first pattern structure layer-containing optical member and the second pattern structure layer-containing optical member and suppresses the moire phenomenon caused by the difference between the two spatial frequencies. It is a display device.
For example, when the composite image display device is a liquid crystal display device, as shown in FIG. 8, the backlight 50 and the first liquid crystal that is the first pattern structure layer-containing optical member are sequentially formed from the lower side of the arrow A. The panel 54, the moire suppressing film 10, and the second liquid crystal panel 58 that is the second pattern structure layer-containing optical member are arranged. In addition, the above-mentioned moire suppression film may be substituted by the 1st moire suppression film laminated body or the 2nd moire suppression film laminated body.

2. 1st pattern structure layer containing optical member A liquid crystal panel is typical as a 1st pattern structure layer containing optical member.
In addition, in the case of the aspect of the first pattern structure layer-containing optical member that causes the moire phenomenon in relation to the second pattern structure layer-containing optical member, for example, an organic EL element, a color filter of a liquid crystal display device, an organic A color filter of an EL element, a special electrode pattern of a liquid crystal display device, a special electrode pattern of an organic EL element, a prism pattern of a liquid crystal display device, and the like are also preferable as the first pattern structure layer-containing optical member.

3. Second Pattern Structure Layer-Containing Optical Member The second liquid crystal panel is typical as the second pattern structure layer-containing optical member.
In addition, in the case of the second pattern structure layer-containing optical member in which the moire phenomenon occurs in relation to the first pattern structure layer-containing optical member, for example, an organic EL element, a color filter of a liquid crystal display device, an organic A color filter of an EL element, a special electrode pattern of a liquid crystal display device, a special electrode pattern of an organic EL element, a prism pattern of a liquid crystal display device, and the like are also preferable as the second pattern structure layer-containing optical member.

4). Effect By making a moiré suppressing film having such an internal refractive index distribution structure or the like between the first pattern structure layer-containing optical member and the second pattern structure layer-containing optical member to be a composite display device In addition, the moire suppressing effect can be effectively exhibited, the straight transmission rate can be kept low, and the backscattering can be suppressed, so that a high-contrast image can be visually recognized.

  Hereinafter, the present invention will be described in more detail with reference to examples. However, the scope of the present invention is not limited to the description of the following examples without any particular reason.

[Example 1]
1. Preparation of (meth) acrylic acid ester copolymer 2 mol of isophorone diisocyanate (IPDI) with respect to 1 mol of polypropylene glycol (PPG) having a weight average molecular weight of 9,200 as a monomer component in a polymerization vessel equipped with a stirrer And 2 mol of 2-hydroxyethyl methacrylate (HEMA) were accommodated, followed by solution polymerization according to a conventional method to obtain a polyether urethane methacrylate having a weight average molecular weight of 9,900.
It was 500,000 when the weight average molecular weight of the obtained polyether urethane methacrylate was measured as a polystyrene conversion value according to the following measurement conditions using the gel permeation chromatography (GPC) method.
GPC measurement device: manufactured by Tosoh Corporation, HLC-8020
GPC column: manufactured by Tosoh Corporation (hereinafter, described in order of passage)
TSK guard column HXL-H
TSK gel GMHXL (× 2)
TSK gel G2000HXL
・ Measurement solvent: Tetrahydrofuran ・ Measurement temperature: 40 ° C.

2. Preparation of Moire Suppressing Film Composition Subsequently, 100 parts by weight of o-phenylphenoxyethoxyethyl acrylate having a weight average molecular weight of 268 and 2-hydroxyl are added to 100 parts by weight of the obtained polyether urethane methacrylate in a container with a stirrer. After adding 10 parts by weight of -2-methylpropiophenone, the mixture was heated and mixed under conditions of 80 ° C. to obtain a composition for a moire suppressing film.
In addition, when the refractive indexes of polyether urethane methacrylate and o-phenylphenoxyethoxyethyl acrylate were measured, the Abbe refractometer [manufactured by Atago Co., Ltd., product name “Abbe refractometer DR-M2”, Na light source, wavelength: 589 nm] was JIS K0062. Was measured to be 1.58 and 1.46, respectively.

3. Application of Moire Suppressing Film Composition Next, the obtained moiré suppressing film composition was subjected to a release treatment by using a knife coater to peel one side of a polyethylene terephthalate film with a silicone release agent (Lintec Co., Ltd.). Manufactured, product name “SP-PET188CL”), a coating layer was formed.
Subsequently, using a drying furnace, heat treatment was performed at 90 ° C. for 1 minute to obtain a coating layer having a thickness of 120 μm.
Next, on the exposed surface side of the coating layer, a 38 μm-thick UV-peeling light release film (manufactured by Lintec Corporation, product name “SP-PLZ383030”) was laminated to form a so-called gap lamination structure.

4). Photo-curing of coating layer Next, an optional uniform exposure adapter is attached to the UV irradiation device (Yamashita Denso Co., Ltd., UV spot light source "HYPERCURE 200") via a light release film on the gap lamination structure coating layer. So that parallel light of ultraviolet rays is incident on the coating film at 0 ° under the conditions of a peak illuminance of 1.0 mW / cm ² and an integrated light amount of 25 mJ / cm ² . Photocuring was performed.
As shown schematically in FIG. 1, a moire suppressing film in which a column structure having a high refractive index was formed in the low refractive index region over the inside of the film was obtained.

5. Evaluation (1) Measurement of straight transmittance The straight transmittance of the obtained moire suppressing film was measured using a light source, two polarizing plates, and a luminance meter.
That is, the brightness of the transmitted light (with the obtained moire suppression film sandwiched so that the absorption axis of the polarizing plate coincides with the MD direction of the moire suppression film between two polarizing plates arranged in parallel Nicols) Lp) was measured.
On the other hand, with respect to the two polarizing plates in the parallel Nicol arrangement, the blank brightness of the transmitted light (Lo = 2766 cd / s) in the same condition as in the state where the moire suppressing film is not sandwiched, that is, only the two polarizing plates. m ² ) was measured.
Next, the straight transmittance was calculated from the obtained Lp (cd / m ² ) and L0 (cd / m ² ) according to the following relational expression (1).
Straight transmittance (%) = Lp / Lo × 100 (1)

(2) Measurement of bending angle haze value After removing the release film on both sides of the obtained moire suppressing film, it was applied to a 1.1 mm-thick glass plate without using an adhesive to obtain a measurement sample. .
Next, for the measurement sample, a haze value was continuously measured in an angle range of −70 ° to + 70 ° using a variable angle haze meter (manufactured by Toyo Seiki Seisakusho Co., Ltd., product name “haze guard with variable incident angle device”). The lowest haze value was taken as the variable haze value (%).

(3) Measurement of normal haze value and total light transmittance After peeling off the release film on both sides, the obtained moire suppressing film was applied to a glass plate with a thickness of 1.1 mm without using an adhesive. A measurement sample was obtained.
Next, the obtained moire suppressing film was subjected to normal haze value (%) and total light using a haze meter (manufactured by Nippon Denshoku Industries Co., Ltd., product name “NDH5000”) in accordance with JIS K 7136: 2000. The transmittance (%) was measured.

(4) Moire suppression evaluation 1 (left-right direction)
The light release film of the obtained moire suppressing film was peeled off, and the exposed surface of the moire suppressing film was made to face the display screen of a tablet terminal (product name “iPad (registered trademark)”, resolution: 264 dpi) manufactured by Apple Inc. Affixed in a state.
Next, the heavy release film was peeled off, and a mask for a liquid crystal display device having a lattice pattern of 60, 120, 180 ppi was attached to the exposed surface of the moire suppressing film to obtain an evaluation sample.
Next, the screen of the tablet terminal described above is displayed in full green (RGB values (R, G, B) = 0, 255, 0), visually observed in the left-right direction (corresponding to the CD direction), and according to the following criteria Then, moire suppression evaluation 1 was performed.
A: No moiré was observed in any of the lattice patterns even when viewed from the front direction (0 ° direction) and the oblique direction (60 ° direction), which are normal directions with respect to the display screen.
○: Even when viewed from the front in the normal direction with respect to the display screen, no moire was observed, but when viewed from an oblique direction, some moire was observed in any of the lattice patterns.
Δ: Even when viewed from the front in the normal direction with respect to the display screen, generation of moire was not observed, but when viewed from an oblique direction, clear generation of moire was observed in any lattice pattern.
X: On the display screen, even when viewed from the front which is the normal direction or from an oblique direction, clear moiré was observed in any of the lattice patterns.

(5) Moire suppression evaluation 2 (up and down direction)
In the moire suppression evaluation 2 of the obtained moire suppression film, the screen of the tablet terminal described above is displayed in full green (RGB values (R, G, B) = 0, 255, 0), and the vertical direction (MD direction). The measurement was conducted according to the following criteria.
A: No moiré was observed in any of the lattice patterns even when viewed from the front direction (0 ° direction) and the oblique direction (60 ° direction), which are normal directions with respect to the display screen.
○: Even when viewed from the front in the normal direction with respect to the display screen, no moire was observed, but when viewed from an oblique direction, some moire was observed in any of the lattice patterns.
Δ: Even when viewed from the front in the normal direction with respect to the display screen, generation of moire was not observed, but when viewed from an oblique direction, clear generation of moire was observed in any lattice pattern.
X: On the display screen, even when viewed from the front which is the normal direction or from an oblique direction, clear moiré was observed in any of the lattice patterns.

(6) Confirmation of the degree of backscattering After peeling the peelable film on both sides of the obtained moire suppressing film, it was applied to a 1.1 mm thick glass plate without using an adhesive, did. The exposed surface of the moire suppressing film was pasted with the antiglare-treated liquid crystal display device facing the display screen.
Next, the liquid crystal display device was set to black display, and was visually observed from the back of the obtained moire suppressing film to obtain a photograph as shown in FIG. The observation environment was a bright environment where fluorescent lamp illumination was incident from various directions.
From the state shown in the photograph, the degree of backscattering was evaluated according to the following criteria.
◎: Even when observed from the front and diagonally backward, it does not look whitish and it is assumed that there is no backscattering.
○: When observed from the front and obliquely behind, it looks a little whitish and has a little backscattering degree.
(Triangle | delta): When it observes from the front and diagonally backward, it looks slightly whitish and the backscattering degree is quite large.
X: When observed from the front and diagonally backward, it looks whitish and the degree of backscattering is remarkable.

[Example 2]
In Example 2, instead of the light-peeling film having ultraviolet transparency of 120 μm thickness of Example 1, a gap-lamination method using a light-peeling film having ultraviolet transparency of 60 μm (hereinafter referred to as “60 μm gap lamination method”). In some cases, a moiré suppression film was prepared in the same manner as in Example 1 except that the moiré suppression property was evaluated.

[Example 3]
In Example 3, two moiré suppression films (120 μm gap lamination method) obtained in the same manner as in Example 1 were prepared, and the MD direction and TD direction of the moiré suppression film were orthogonal to each other at 90 °. In the same manner as in Example 1, the moire suppressing property and the like were evaluated except that the film was laminated to form a moire suppressing film laminate.

[Example 4]
In Example 4, two moiré suppression films (60 μm gap lamination method) obtained in the same manner as in Example 2 were prepared, and they were laminated so that the moiré suppression film MD direction and the TD direction were orthogonal to each other. Except for the moire suppressing film laminate, the moire suppressing property and the like were evaluated in the same manner as in Example 1.

[Example 5]
In Example 5, three moiré suppression films (120 μm gap lamination method) obtained in the same manner as in Example 1 were prepared, and the three moiré suppression films were laminated so that the MD directions of the moiré suppression films all coincided. Except for the suppression film laminate, the moire suppression and the like were evaluated in the same manner as in Example 1.

[Example 6]
In Example 6, a particle-dispersed moire suppressing film (thickness: 60 μm, haze value: 20%) was produced on one side of the moire suppressing film (120 μm gap lamination method) obtained in the same manner as in Example 1. Except for the moire suppressing film laminate, the moire suppressing property and the like were evaluated in the same manner as in Example 1.

The particle-dispersed moiré suppressing film is an acrylic ester copolymer obtained by a solution polymerization method (60 parts by weight of 2-ethylhexyl acrylate, 10 parts by weight of isobornyl acrylate, 10 parts by weight of N-acryloylmorpholine as monomer components). Part, and 100 parts by weight of 2-hydroxyethyl acrylate and active energy ray-curable component (ethylene oxide-modified isocyanuric acid diacrylate and ethylene oxide-modified isocyanuric acid triacrylate (product of Toa Gosei Co., Ltd., product name) "Arunix M315") 5 parts by weight, as a photopolymerization initiator, 0.25 parts by weight of 2-hydroxy-2-methyl-1-phenylpropan-1-one, 0.25 parts by weight of benzophenone, and as a crosslinking agent , Trimethylolpropane modified tolylene diiso 0.2 parts by weight of anate, 0.3 parts by weight of 3-glycidoxypropyltrimethoxysilane as a silane coupling agent, and fine particles composed of a silicon-containing compound (product name, manufactured by Momentive Performance Materials Japan) “Tospearl 145L”, average particle diameter: 4.5 μm, refractive index: 1.43) 1 part by mass, and further, derived from the composition for moire suppression film obtained by diluting with methyl ethyl ketone Yes.
Subsequently, the obtained moire-inhibiting film composition was peeled off on one side of a polyethylene terephthalate film with a silicone-based release agent using a knife coater (product name “SP-PET382020” manufactured by Lintec Corporation). The coating layer was formed on the release-treated surface of “)”.
Subsequently, using a drying furnace, heat treatment was performed at 90 ° C. for 1 minute to obtain a coating layer having a thickness of 50 μm.
Next, a light-release film having a thickness of 120 μm and having ultraviolet transparency (product name “SP-PET382120” manufactured by Lintec Corporation) was laminated on the exposed surface side of the coating layer.
Then, through the light release film, the parallel light of the ultraviolet rays from the ultraviolet irradiation device (manufactured by Yamashita Denso Co., Ltd., with the ultraviolet spot light source “HYPERCURE 200” attached with an optional uniform exposure adapter) is applied to the coating film. The film was exposed to light at a peak illuminance of 1.0 mW / cm ² and an integrated light amount of 25 mJ / cm ² so as to be incident at 0 °, and the coating layer was photocured.
Finally, the particle-dispersed moire suppressing film (thickness: 50 μm, normal haze value: 20%) obtained by curing for 7 days under the conditions of 23 ° C. and 50% Rh was used as the moire obtained in Example 1. The moiré suppression property and the like were evaluated in the same manner as in Example 1 except that the moiré suppression film laminate was applied to one surface of one suppression film.

[Example 7]
In Example 7, the amount of particles in the particle-dispersed moire suppressing film prepared in Example 6 was adjusted with respect to one side of the moire suppressing film (120 μm gap lamination method) obtained in the same manner as in Example 1, and particles A moiré suppression property and the like were evaluated in the same manner as in Example 1 except that a dispersion type moiré suppression film (thickness: 50 μm, normal haze value: 40%) was prepared and used as a moiré suppression film laminate.

[Example 8]
In Example 8, the amount of particles in the particle-dispersed moire suppressing film prepared in Example 6 was adjusted with respect to one side of the moire suppressing film (120 μm gap lamination method) obtained in the same manner as in Example 1, and the particles A moiré suppression property and the like were evaluated in the same manner as in Example 1 except that a dispersion type moiré suppression film (thickness: 50 μm, normal haze value: 60%) was prepared and used as a moiré suppression film laminate.

[Comparative Example 1]
In Comparative Example 1, the amount of particles in the particle-dispersed moire suppressing film prepared in Example 6 was adjusted, and the particle-dispersed moire suppressing film (thickness: 50 μm, normal haze value: 75%) was used alone. In the same manner as in Example 1, the moire suppressing property and the like were evaluated.

[Comparative Example 2]
In Comparative Example 2, the particle type in the particle dispersion type moire suppressing film prepared in Example 6 is a styrene particle filler (average particle size: 4.5 μm, blending amount: 10.0% by mass), and particle dispersion type moire suppression is performed. Except for using the film (thickness: 50 μm, normal haze value: 87%) as a simple substance, the moire suppressing property and the like were evaluated in the same manner as in Example 1.

[Comparative Example 3]
In Comparative Example 3, the particle type in the particle-dispersed moire suppressing film prepared in Example 6 is a styrene particle filler (average particle size: 2.5 μm, blending amount: 22.4 mass%), and the first particle dispersion A mold moire suppressing film (normal haze value: 85%, thickness: 12 μm) was obtained.
Similarly, the particle type in the particle-dispersed moire suppressing film prepared in Example 6 is styrene particle filler (average particle size: 2.5 μm, blending amount: 7.1 mass%), and the second particle-dispersed moire is used. A suppression film (haze value: 53%, thickness: 12 μm) was obtained.
Example 1 except that the first particle-dispersed moire suppressing film and the second particle-dispersed moire suppressing film were laminated to form a moire suppressing film laminate (usually haze value: 91%, thickness: 24 μm). In the same manner as above, the moire suppressing property and the like were evaluated.

As described above in detail, according to the present invention, by setting the straight-line transmittance represented by the predetermined relational expression (1) to a value within a predetermined range, moire suppression is good and the degree of backward diffusion is low. Fewer moiré suppression films can be provided.
Therefore, the moiré suppressing film or the like of the present invention is arranged in the gap between the various first display devices and the second display device to obtain a composite display device. The degree of back diffusion is small and a high-contrast stereoscopic image or the like can be viewed.

Furthermore, the use object of the moiré suppressing film of the present invention is typically a combination of the first liquid crystal panel and the second liquid crystal panel, but can be widely used in combinations where the occurrence of moiré is a problem. .
Therefore, since not only the liquid crystal display device but also the organic EL element may use an electrode pattern, the combination of the first organic EL element and the second organic EL element, the first liquid crystal panel, and the second organic EL element may be used. Similarly, it can also be used for applications where generation of moire is a problem, such as a combination of EL elements.
That is, even in these applications, it is expected to contribute to the improvement of the quality of stereoscopic images with good moire suppression, a low degree of back diffusion.

10: Moire suppression film 12: Columnar object having a relatively high refractive index (high refractive index portion)
14: Low refractive region having a relatively low refractive index (low refractive index portion)
16, 16a, 16b: Adhesive layers 18, 18 ': Particle-dispersed moire suppressing film 18a: Particle 18b: Resin layer 20: Moire suppressing film laminate (first moire suppressing film laminate)
30: Moire suppressing film laminate (second moire suppressing film laminate)
50: Backlight 52: 1st polarizing film 54: 1st pattern structure layer containing optical member 56: 2nd polarizing film 58: 2nd pattern structure layer containing optical member 60: 3rd polarizing films 90 and 100 110: Composite display device

Claims (8)

A moire suppression film that suppresses the moire phenomenon caused by the difference between two spatial frequencies,
In a region having a relatively low refractive index composed of a single layer, it has a plurality of pillars made of a material having a relatively high refractive index,
And the moiré suppression film defined by the following relational expression (1) is characterized in that the straight transmittance of the moiré suppression film is 8% or less.
Straight transmission rate = Lp / Lo × 100 (1)
(Lp: Brightness of transmitted light (cd / m ² ) measured with a moire suppression film sandwiched between two polarizing plates arranged in a parallel Nicol state, Lo: two sheets arranged in a parallel Nicol state Brightness of transmitted light (cd / m ² ) measured only on the polarizing plate   2. The variable angle haze value of ± 70 ° with respect to the MD direction and the TD direction of the moire suppressing film, or one of the variable angle haze values is 80% or more. Moire suppression film.   The moiré suppression film according to claim 1 or 2, wherein a haze value measured in accordance with JIS K 7136: 2000 is set to a value of 80% or more.   The moire suppressing film according to any one of claims 1 to 3, wherein the thickness is set to a value within a range of 40 to 500 µm.   The moire suppressing film according to any one of claims 1 to 4, wherein an adhesive layer is provided on at least one surface. A moire suppressing film laminate comprising the moire suppressing film according to any one of claims 1 to 5,
A moire suppressing film laminate comprising a particle-dispersed light diffusion layer provided on at least one surface of the moire suppressing film. A moire suppression film laminate comprising a first moire suppression film and a second moire suppression film, which suppresses the moire phenomenon caused by the difference between two spatial frequencies,
The first moire suppressing film and the second moire suppressing film have a plurality of columnar objects made of a material having a relatively high refractive index in a region having a relatively low refractive index made of a single layer. ,
The angle formed between the MD direction of the first moire suppressing film and the MD direction of the second moire suppressing film corresponding to them is a value within a range of 1 to 179 °,
And the moire suppression film laminated body defined by the following relational expression (1) is characterized in that the straight transmittance of the moire suppressing film laminated body is 8% or less.
Straight transmission rate = Lp / Lo × 100 (1)
(Lp: Brightness of transmitted light (cd / m ² ) measured with a moire suppression film sandwiched between two polarizing plates arranged in a parallel Nicol state, Lo: two sheets arranged in a parallel Nicol state Brightness of transmitted light (cd / m ² ) measured only on the polarizing plate A composite display device including a moire suppressing film that is disposed between at least the first pattern structure layer-containing optical member and the second pattern structure layer-containing optical member and suppresses a moire phenomenon caused by a difference between two spatial frequencies. Because
The moire suppressing film has a plurality of columnar materials made of a material having a relatively high refractive index in a region having a relatively low refractive index made of a single layer,
And the composite display apparatus characterized by making the linear transmittance | permeability of the said moire suppression film defined by the following relational expression (1) into the value of 8% or less.
Straight transmission rate = Lp / Lo × 100 (1)
(Lp: Brightness of transmitted light (cd / m ² ) measured with a moire suppression film sandwiched between two polarizing plates arranged in a parallel Nicol state, Lo: two sheets arranged in a parallel Nicol state Brightness of transmitted light (cd / m ² ) measured only on the polarizing plate