WO2019198581A1

WO2019198581A1 - Anti-glare front panel, and display device and vehicle information display device using same

Info

Publication number: WO2019198581A1
Application number: PCT/JP2019/014735
Authority: WO
Inventors: 吉田　昇平; 正晴橋爪
Original assignee: 株式会社ポラテクノ
Priority date: 2018-04-11
Filing date: 2019-04-03
Publication date: 2019-10-17
Also published as: TW201944105A; JP2021105627A

Abstract

The present invention provides a front panel (100) wherein a film including an anti-glare layer (16) with an irregular phase-separated structure is integrally formed with a resin (10), with the anti-glare layer (16) arranged on the viewer side.

Description

Front plate with antiglare function, display device using the same, and vehicle information display device

The present disclosure relates to a front plate with an antiglare function installed on the front surface of an information display device such as a vehicle meter, a display device using the same, and a vehicle information display device.

Outside the information display device that displays various information during driving such as liquid crystal displays (liquid crystal) and instrument panels of automobiles, etc., it is also called a front plate (cover or front panel) for protecting dust, liquid crystal, etc. ) Is provided. Also, in recent years, not only the meter cluster part, but also the design of applying a display device to a wide area of the center information display, as well as side mirror replacement, etc. has progressed. Has been applied.

When the front plate (cover) is transparent, the internal liquid crystal display is illuminated by external light, and the polarizing plate and the transparent electrode of the display are visible due to the reflection of the liquid crystal surface of the liquid crystal display, so that the appearance when not displaying is deteriorated. Therefore, a gray smoke-like translucent acrylic resin having a transmittance of about 20% to 70% is used as the front plate. A gray-smoke-like translucent front plate (cover) with a transmittance of about 20 to 70% is usually manufactured by injection molding mainly using a colored resin such as acrylic resin or polycarbonate. Yes.

As described above, by using the gray smoke-like front plate, it is possible to reduce the external reflection light on the surface of the liquid crystal display and increase the display contrast. Further, by using a gray smoke-like front plate so that the liquid crystal display or the like does not show the inside of the information display device when it is not displayed, it is possible to prevent the judgment from being complicated due to excess information.

Also, a front plate has been proposed in which a polarizing plate and a transparent resin are integrally formed instead of a gray smoke-like resin. In this case, since polarized light is emitted from the display unit such as a liquid crystal, the emitted light from the image display unit can be efficiently extracted without attenuating the emitted light by the front plate even in a gray smoke tone. it can.

In addition, in an information display device such as an automobile, the display image is displayed for the purpose of bringing unity between the display unit and the design of interior parts, or in the display unit by reflection of external light such as sunlight entering the vehicle. In order not to be difficult to see, an anti-glare process such as matting may be imparted to the surface of the front plate. For example, in order to impart anti-glare properties to the surface of an injection-molded product, a method of transferring the unevenness against a molten or softened resin using a mold having a rough surface or a film having unevenness in advance as a mold, A method of imparting antiglare properties to the surface of a molded product by sandblasting the resin surface after injection molding is employed. In addition, for example, the antiglare layer used for liquid crystal or the like is obtained by applying a UV curable resin such as an acrylic resin mixed with organic or inorganic fine particles (filler) on the film surface and curing it. . Furthermore, the said film may be laminated | stacked and used for a polarizing film through an adhesive layer as a support film of a polarizing plate. Specifically, a front plate formed by insert molding a film having an antiglare layer and a resin is disclosed.

However, with these methods, it is not easy to adjust the optical characteristics of the antiglare layer every time the interior design or optical design of the vehicle changes.

In addition, when molding an anti-glare film or a polarizing plate laminated therewith with a resin, the surface irregularities of the anti-glare film are crushed by the high-temperature and high-pressure treatment during molding, and the anti-glare performance decreases after processing. Therefore, there is a problem that the anti-glare function of the originally designed anti-glare film cannot be fully utilized.

In recent years, display panels of liquid crystal display devices have been improved in definition, and conventional anti-glare films mixed with fine particles have become glaring, making it impossible to sufficiently cope with higher definition. In particular, when a front plate is provided on the display device, the distance between the display device and the front plate changes depending on the design of the installation location in the vehicle and the application. When the distance is short, glare of the display image due to the antiglare layer becomes a problem. On the other hand, when the distance increases, the anti-glare layer affects the sharpness of the display image. Therefore, it is necessary to attach an antiglare layer to the front plate of the display device that can cope with these problems.

In view of the above problems, the present disclosure aims to provide a glare-proof front plate that suppresses glare even in a high-definition display device and has high sharpness.

As a result of diligent examination, the applicant has formed a film provided with an antiglare layer having an uneven phase separation structure and a resin, thereby suppressing glare even in a high-definition display device, and high The inventors have found that the present invention has clearness and have completed the present disclosure.

That is, one aspect of the present disclosure is that a film provided with an antiglare layer having a phase separation structure having irregularities and a resin are integrally formed, and the antiglare layer is disposed on the viewing side. It is the front board of the display apparatus characterized.

Here, the antiglare layer may include at least one thermoplastic resin and a cured product of at least one curable resin, and may have a phase separation structure of the thermoplastic resin and the curable resin.

The curable resin may include at least one selected from an acrylic resin, a polymethyl methacrylate resin, and a polycarbonate resin.

The film may include a polarizing film containing a dichroic dye and a support film that sandwiches both surfaces of the polarizing film, and at least one of the support films may include the antiglare layer.

The antiglare layer has a haze value of 1% or more and 10% or less, the antiglare layer has a transmitted image definition of 40% or more at an optical comb width of 0.05 mm, and an optical comb is provided. The transmitted image definition at 0.125 mm may be 70% or more.

The antiglare layer has a difference in change between a haze value before integrally molding the film and the resin and a haze value after integral molding being 1.5% or less, and the film and the resin The ratio of the change in arithmetic mean roughness, root mean square height, and maximum height in the surface roughness before integrally molding and the surface roughness after integrally molding may be 10% or less, respectively.

The resin may be a gray smoke resin having a transmittance of 20 to 70%.

Further, an adhesive layer may be provided between the antiglare layer and the resin, and the adhesive layer may include amorphous polyester.

Another aspect of the present disclosure is a display device including the front plate.

Another aspect of the present disclosure is an in-vehicle information display device that includes the front plate and is used in an in-vehicle display device.

According to the present disclosure, it is possible to provide an anti-glare front plate having high definition and suppressing glare even in a high-definition display device.

It is a cross-sectional schematic diagram which shows the structure of the front plate in embodiment of this indication. It is a cross-sectional schematic diagram which shows another example of a structure of the front plate in embodiment of this indication.

Form to carry out

The front plate 100 in the embodiment of the present disclosure is configured by laminating a resin layer 10, an adhesive layer 12, a support film 14, and an antiglare layer 16 as shown in the schematic cross-sectional view of FIG. In addition, the application range of this indication should just be the structure by which the resin layer 10 and the glare-proof layer 16 were shape | molded integrally, and the front plate 100 is the example. Moreover, FIG. 1 is a schematic diagram to the last, and the actual film thickness and the like of each layer are not as illustrated.

The front plate 100 is provided on the viewing side of an information display device that displays various types of information during driving, such as a liquid crystal display (liquid crystal) such as a car or an instrument panel. The front plate 100 can protect the display device from dust and scratches.

Note that the front plate 100 may be referred to as a cover or a front panel. In the present embodiment, the front plate 100 can be used to protect a display device that displays information from the outside world. In the present embodiment, it is referred to as a front plate 100, but is not necessarily limited to the one used on the front surface of the display device, and may be used on the side surface, back surface, and upper and lower surfaces of the display device. That is, the front plate 100 only needs to be disposed on a surface for visually recognizing information from the display device.

In the present embodiment, a display device means a device that displays information by at least one light emission. That is, the display device only needs to display certain information that can be recognized by a person or a machine by emitting emitted light to the outside. The display device may emit light by itself, or may be light supplied from another source such as a backlight or reflected light. Examples of the display device include a liquid crystal display (liquid crystal) and an organic EL (OLED). There may be a plurality of display devices, and they may be of the same type or of different types. Moreover, it may be the same color tone or different color tone. The display device may be for displaying fixed information for displaying the state, or for displaying variable information such as a speedometer and a tachometer.

[Anti-glare layer 16]
The antiglare layer 16 according to the present disclosure is a surface-treated layer provided on the viewing side, and is generally referred to as an “antiglare layer (abbreviated as an AG layer)”, and is otherwise referred to as a “matte layer”. . The antiglare layer 16 is a layer in which a fine uneven structure is provided on the surface of a film or resin.

The antiglare layer 16 is disposed on the front surface of the display device, for example, and diffuses and reflects light with its fine structure, so that external light or room light is reflected on the screen of the display device, making it difficult to see the display image. It can be used to reduce feelings. In addition, the surface of an automobile interior member is generally subjected to unevenness processing such as embossing and matting, and there is a case where a harmonious design is required between the interior part and the display device. Therefore, the antiglare layer 16 is applied to the front plate for the display device in the vehicle.

In addition, the hard coat property (or scratch resistance) can be imparted to the antiglare layer 16 by curing the curable resin. Thereby, the front plate 100 can be hardly scratched by scratches or the like. Further, the antiglare layer 16 can be imparted with antifouling properties by including, for example, a silicon-based or fluorine-based additive. Thereby, it is possible to easily wipe off fingerprints and dirt on the front plate 100.

The anti-glare layer 16 in the present embodiment is characterized in that the uneven structure is a phase separation structure. The phase separation structure is composed of a resin composition containing a thermoplastic resin and a curable resin. That is, the phase separation structure refers to a structure formed by spinodal decomposition (wet spinodal decomposition) from a liquid phase in which a thermoplastic resin and a curable resin are mixed in a solvent. More specifically, spinodal decomposition is usually performed by applying a mixed solution or a resin composition containing at least one thermoplastic resin, at least one curable resin, and a solvent to a support, and the solvent is evaporated from the coating layer. Caused by In the process of evaporating the solvent from the liquid phase in which the thermoplastic resin and curable resin are mixed with the solvent by drying or the like, spinodal decomposition occurs as the concentration increases, and phase separation between the thermoplastic resin and the curable resin occurs. A phase separation structure is obtained. In the phase separation structure, the distance between the irregularities is relatively regular.

The curable resin may be, for example, an epoxy (meth) acrylate, urethane (meth) acrylate, polyester (meth) acrylate, silicone (meth) acrylate, a polyfunctional monomer having at least two polymerizable unsaturated bonds, or the like. Good.

The thermoplastic resin may be any resin that can be phase-separated by spinodal decomposition, such as cellulose derivatives, styrene resins, (meth) acrylic resins, alicyclic olefin resins, polycarbonate resins, polyester resins, and the like. Also good.

In addition, various additives may be added to the antiglare layer 16 as necessary. Additives include additives such as antistatic agents, plasticizers, surfactants, antioxidants, ultraviolet absorbers, etc., in addition to surface modifiers such as silicon and fluorine.

The antiglare layer 16 can be formed on a transparent film. Specifically, a film having the antiglare layer 16 can be formed on the transparent film by a method such as applying or transferring the antiglare layer 16.

The antiglare layer 16 can be formed on the surface of a support film or the like using a known method (for example, see JP-A-2006-103070). As the resin forming the support film, a cycloolefin resin, a polyester resin, an acrylic resin, a polycarbonate resin, a polysulfone resin, an alicyclic polyimide resin, an acetyl cellulose resin, or the like can be applied. From the viewpoint of easily adhering to a polarizing film and obtaining a polarizing plate, it is preferable to use an acetyl cellulose resin, more preferably triacetyl cellulose (TAC). Moreover, the film which has an anti-glare layer may use a commercially available thing, for example, can use commercially available Daicel Chemical Industries PFT80000HNP.

[Polarizer]
A film having the antiglare layer 16 can also be used as a support for the polarizing plate. Then, the structure which applied the film which has the glare-proof layer 16 as a support body of a polarizing plate is demonstrated.

FIG. 2 shows the configuration of the front plate 100 when a film having the antiglare layer 16 is used as a support for a polarizing plate. In this case, the front plate 100 is configured by laminating the resin layer 10, the adhesive layer 12, the first support film 14 a, the polarizing film 18, the second support film 14 b, and the antiglare layer 16. In addition, what is necessary is just the structure by which the resin layer 10, the polarizing film 18, and the glare-proof layer 16 were shape | molded integrally, and the front board 100 is the example. Moreover, FIG. 2 is a schematic diagram to the last, and the film thickness and the like of each actual layer are not as illustrated.

The polarizing plate has a configuration in which a supporting film 14 (in FIG. 2, a first supporting film 14a and a second supporting film 14b are bonded to both surfaces) on one or both surfaces of a polarizing film 18 that functions as a polarizing element. Although only the polarizing film 18 can be used, it is preferable to use it as a polarizing plate in which both surfaces of the polarizing film 18 are sandwiched between the first support film 14a and the second support film 14b. This is because, since the polarizing film 18 is generally a uniaxially stretched polyvinyl alcohol dyed with a dichroic dye and is a thin film, it is sandwiched between the first support film 14a and the second support film 14b. This is because, in a state where it is not done, it may be easily deformed by heat or moisture, and the polarization characteristics may be impaired. Therefore, by using as a polarizing plate sandwiched between the first support film 14a and the second support film 14b, it is possible to improve workability when integrally molding.

The polarizing film 18 is a film having a function of converting natural light into linearly polarized light, and may be obtained by adsorbing and orienting a dichroic dye on a polyvinyl alcohol resin film.

As the dichroic dye, iodine or an azo, anthraquinone, or tetrazine dichroic dye can be used.

For example, when iodine is used as the dichroic dye, after the polyvinyl alcohol resin film is dyed with iodine, or at the same time, the drawing treatment, boric acid treatment, and if necessary, in a chlorine compound-containing aqueous solution It can manufacture by performing the complementary color process immersed in.

Further, for example, an azo, anthraquinone, or tetrazine dichroic dye may be used as a dichroic dye. Examples of the dichroic dye include azo compound dyes, C.I. I. Direct Yellow 12, C.I. I. Direct Yellow 28, C.I. I. Direct Yellow 44, C.I. I. Direct Orange 26, C.I. I. Direct Orange 39, C.I. I. Direct Orange 107, C.I. I. Direct Red 2, C.I. I. Direct Red 31, C.I. I. It can be either Direct Red 79. Further, a dye described in JP-A No. 2003-215338 and a dye described in WO 2007/138980 may be used. In addition, two or more of these dyes are blended so as to supplement the polarization characteristics at each wavelength in the visible range, and the hue of neutral gray is obtained by dyeing polyvinyl alcohol (PVA) with these dyes. It is preferable. The thickness of the polarizing film 18 is usually about 10 to 40 μm.

When a dichroic dye is used as a dichroic dye, durability of optical properties under high temperature conditions and high temperature and high humidity conditions is superior to iodine, and color change during molding is less than that of iodine. Therefore, the hue adjustment in the polarizing film 18 is easy, and the yellowness can be lowered as compared with the case where iodine is used as the dichroic dye.

The polarizing film 18 may be an achromatic polarizing film 18 instead of the conventional colored polarizing film 18. In this case, the achromatic polarizing film 18 has an absolute value of hue a * and hue b * in parallel Nicols (the hue coordinates a * and b * are color coordinates determined by the International Commission on Illumination (CIE)). May be 1.0 or less. Such an achromatic polarizing film 18 can be produced by a known method (for example, a method disclosed in International Publication WO2014 / 162634A1).

Specifically, it is preferable that the single transmittance Ys of the polarizing film 18 suitable for the front plate 100 is 20 to 50% and the polarization degree Py is 90% or more. Here, when a polarizing plate having a single transmittance Ys of 20 to 30% or less is produced, the productivity is lowered because a high concentration dyeing solution is used or the dyeing needs to be performed for a long time. Further, when the amount of adsorption is saturated when the dichroic dye is adsorbed to a film such as PVA, the unit transmittance Ys may not be reduced to 20 to 30% or less. Therefore, in order to obtain a desired transmittance in the front plate 100, a polarizing plate and a gray smoke resin may be used in combination.

The transmittance and the degree of polarization can be measured by JASCO Corporation V-7100 and Hitachi, Ltd. U-4100. Specifically, a polarizing plate is produced, and the transmittance when one polarizing plate is used is the transmittance when the single polarizing plate Ys and the two polarizing plates are stacked so that the absorption axis directions are the same. Let the transmittance be the parallel transmittance Yp, and let the transmittance when the two polarizing plates are stacked so that the absorption axes are orthogonal to each other be the orthogonal transmittance Yc. The respective transmittances are calculated from the formula (1) by obtaining the spectral transmittance τλ at predetermined wavelength intervals dλ (here, 5 nm) in the wavelength region of 380 to 700 nm. In Equation (1), Pλ represents the spectral distribution of the standard light (C light source), yλ represents the color matching function of the double field of view, and τλ represents the spectral transmittance.

Further, the degree of polarization Py is obtained from the parallel transmittance Tp and the orthogonal transmittance Tc by the mathematical formula (2).

When using the support film 14 as a polarizing plate, the support film 14 is bonded to one side or both sides of the polarizing film 18. Examples of the resin that forms the support film 14 (first support film 14a, second support film 14b) include cycloolefin resin, polyester resin, acrylic resin, polycarbonate resin, polysulfone resin, and alicyclic polyimide resin. An acetyl cellulose resin or the like can be applied.

In the case of the present embodiment, the antiglare layer 16 is provided on the second support film 14b on the viewing side of the front plate 100. As described above, the antiglare layer 16 can be formed on the second support film 14b.

By providing the support film 14, when the support film 14 and the resin 10 are made of the same material, the interface can be welded together by heating when the support film 14 and the resin 10 are integrally formed. .

When the polarizing plate is integrally formed, the polarizing film 18 may be disposed so that the side on which the polarizing film 18 is provided is inside the information display device. When arranged in this manner, since the polarizing film 18 exists inside the information display device, it is possible to suppress the effects of depolarization caused by the resin and the occurrence of rainbow unevenness due to optically anisotropic components. Furthermore, it is good also as a structure which does not provide the support film for protecting the polarizing film 18. FIG. However, since the depolarization property and optical anisotropy component caused by the resin 10 can be adjusted by selecting the material of the resin 10 and the conditions at the time of molding, the polarizing plate is installed outside the information display device. Also good.

[Phase difference film]
When the polarizing plate having the film having the antiglare layer 16 and the polarizing film 18 is used, a retardation film may be provided on the viewing side of the polarizing plate.

When automobile drivers wear polarized sunglasses, if the front plate 100 having a polarizing plate is arranged on the viewing side of the liquid crystal display device, the polarization axes of the polarizing film 18 and the polarized sunglasses coincide, and the display image is displayed. May not be visible. Therefore, the visibility problem can be solved by providing a retardation film on the viewing side of the front plate 100, that is, the viewing side of the polarizing plate.

In the present embodiment, a retardation film having the antiglare layer 16 by directly forming the antiglare layer 16 on the retardation film may be used. Furthermore, you may use this as the support film 14 of a polarizing plate.

A retardation film is a film-like optical member made of a birefringent material. The thickness of the retardation film may be 5 μm or more and 500 μm or less, and may be 10 μm or more and 300 μm or less. When the thickness of the retardation film is less than 5 μm, the handleability as an industrial material is lowered.

The retardation of the retardation film may be in the range of 300 nm to 30000 nm. When the retardation is higher than 30000 nm, the film thickness is correspondingly increased, and the handleability as an industrial material is lowered. Examples of the retardation film include a λ / 4 retardation film and a λ / 2 retardation film.

[Integrated molding with resin 10]
In front plate 100, a film having resin 10 and antiglare layer 16 is integrally formed. In the present embodiment, integral molding means that the film having the resin 10 and the antiglare layer 16 is physically integrated. The integral molding may be performed not only by molding means such as injection molding or insert molding, but also by bonding with an adhesive or an adhesive.
In addition, when the form of the front plate 100 is curved or has a three-dimensional structure, injection molding is performed so that the film having the antiglare layer 16 and the resin 10 can be processed following each other. It is preferable to apply molding means by insert molding. In the case of the front plate 100 having a more complicated structure, it is preferable that the film having the antiglare layer 16 is shaped in advance so that the film having the antiglare layer 16 and the resin 10 can be easily followed. On the other hand, when the front plate 100 has a shape other than a flat surface or has irregularities, the method of bonding the film having the antiglare layer 16 to the resin 10 with an adhesive or a pressure sensitive adhesive, There is a possibility that air may be caught in the adhesive layer or the pressure-sensitive adhesive layer, and it is not easy to finish with a good appearance.

Resin 10 is not particularly limited as long as it is a material that can be integrally molded and has a mechanical strength that can be protected from the outside world.

When the front plate 100 is used in the center information section instead of the meter cluster section in an automobile, a polycarbonate resin (PC resin) is used to obtain stable performance under high temperature conditions and high temperature and high humidity conditions. Also good. In this case, since a higher molding temperature is required, the polarizing film 18 needs high heat resistance. Therefore, the polarizing film 18 using a dichroic dye is preferable.

The resin 10 is desirably transparent, but is not limited to being transparent, and may be smoked such as gray smoke. For example, if it is impossible to design a front plate with the desired low transmittance using only the polarizing plate alone, the transmittance of the entire front plate is adjusted by integrating the polarizing plate and gray smoke resin together. May be. In this case, if the polarization degree of the polarizing plate is 90% or more, the effect of the front plate 100 having the polarizing plate can be sufficiently obtained. In the case where a polarizing plate is not used for the front plate 100, the front plate 100 may be configured by combining the support film 14 provided with the antiglare layer 16 and the transparent or gray smoke resin 10.

The transmittance of the gray smoked resin 10 may be 20% or more, and preferably 20% or more and 50% or less. When the transmittance is less than 20%, the display appears dark when the display is on (the liquid crystal display is being performed). Further, when the transmittance exceeds 50%, the internal mechanism such as the speedometer needle is seen through when the display is turned off (when the liquid crystal or the like is being displayed), which deteriorates the appearance.

Examples of the material of the resin 10 suitable for integral molding include acrylic resin, polymethyl methacrylate resin (PMMA resin), PC resin, and the like. The material of the resin 10 may be a PMMA resin from the viewpoints of price, transparency, difficulty in scattering when damaged, and the like. Moreover, the material of these resin 10 can use the pellet-shaped material marketed.

Resin 10 contains antioxidants, lubricants, UV absorbers, colorants, flame retardants, crosslinking aids, inorganic fillers as necessary for the purpose of improving hardness, strength, moldability, durability, water resistance, and hue. Additives such as materials may be added.

The antioxidant is not particularly limited, and those generally used can be used. Specifically, phenolic antioxidants and amine antioxidants that are radical chain inhibitors are preferred, and phenolic antioxidants are particularly preferred. Examples of phenolic antioxidants include 2,6-t-butyl-p-cresol, 2,6-t-butyl-4-ethylphenol, 2,2′-methylenebis (4-methyl-6-t-butylphenol) and Examples thereof include 1,1,3-tris (2-methyl-4-hydroxy-5-tert-butylphenyl) butane.

There is no restriction | limiting in particular as a ultraviolet absorber, The thing generally used can be used. Specifically, benzophenone ultraviolet absorbers, benzotriazole ultraviolet absorbers, and cyanoacrylate ultraviolet absorbers are preferred, and benzophenone ultraviolet absorbers are particularly preferred. Examples of benzophenone ultraviolet absorbers include 2- (2′-hydroxy-5′-methylphenyl) benzotriazole, 2- (2′-hydroxy-5′-butylphenyl) benzotriazole, and 2- (2-hydroxy-3 '-T-butylphenyl) benzotriazole and the like.

There are no particular restrictions on the colorant, and anthraquinone, azo, carbonium, quinoline, quinoneimine, indigoid, phthalocyanine, and other organic pigments, azoic dyes, sulfur dyes and other organic dyes, titanium yellow, yellow oxidation Examples thereof include inorganic pigments such as iron, zinc yellow, chrome orange, molybdenum red, cobalt violet, cobalt blue, cobalt green, chromium oxide, titanium oxide, zinc sulfide, and carbon black. The blending amount is not particularly limited.

The flame retardant is not particularly limited, and bromine-containing compounds such as brominated epoxy compounds, acid-modified brominated epoxy compounds, brominated epoxy compounds having an acryloyl group, acid-modified brominated epoxy compounds having an acryloyl group, red Phosphorus, tin oxide, antimony compounds, zirconium hydroxide, barium metaborate, aluminum hydroxide, magnesium hydroxide and other inorganic flame retardants, ammonium phosphate compounds, phosphate compounds, aromatic condensed phosphate esters, halogen-containing condensed phosphorus Examples thereof include phosphorus compounds such as acid esters, nitrogen-containing phosphorus compounds, and phosphazene compounds.

In the front plate 100 in which the film having the antiglare layer 16 and the resin 10 are integrally formed, the degree of decrease in the antiglare performance before and after being integrally formed is, for example, surface roughness measurement, haze measurement, and transmission. It can be evaluated from the measurement of image definition. These values change with a correlation with the change in the concavo-convex shape.

In front plate 100 in the present embodiment, changes in measured values before and after molding are the changes in arithmetic mean roughness (Ra), root mean square height (Rq), and maximum height (Rz) in surface roughness. Each ratio is 10% or less, the difference between the haze value before molding and the haze value after molding is 1.5% or less, and in the transmitted image definition, the difference between before molding and after molding is 0.05 mm in the width of the optical comb. In this case, it may be 15% or less, and may be 5% or less when the width of the optical comb is 0.125 mm. That is, the front plate 100 in the present embodiment has almost no change in appearance or a decrease in anti-glare performance before and after molding.

Surface roughness refers to the state of unevenness on the surface of parts, films, etc., and refers to a periodic shape in which peaks and valleys with different heights, depths, and intervals are continuous. The surface roughness can be evaluated using values such as arithmetic average surface roughness Ra, root mean square roughness Rq, and maximum height Rz. That is, using these evaluation values, it is possible to evaluate the fineness of the unevenness of the antiglare layer 16 and the change in the height of the unevenness before and after the molding process.

Arithmetic average surface roughness Ra is an evaluation value indicating the height of the unevenness on the surface, and a part of the roughness curve measured with a roughness meter is extracted at the reference length, and the average value of the unevenness height in that section. Is a value representing The root mean square roughness Rq is a value representing the root mean square of the height of the unevenness in the reference length section, and means a standard deviation of the surface roughness. The maximum height Rz is obtained from the sum of the highest part (maximum peak height) and the lowest part (maximum valley depth) by extracting a part of the roughness curve measured with a roughness meter at the reference length.

The evaluation value regarding the surface roughness in the present embodiment is measured using a surf test SJ-310 manufactured by Mitutoyo Corporation. Specifically, the film is fixed on a smooth glass plate with the antiglare layer 16 on the upper side, and a standard detector of the measuring machine (measuring force is 0.75 mN, Stalice shape is tip radius 2 μ, tip angle 60 degrees. Place a standard drive unit with a) on the uneven surface of the film. Then, the height information of the continuous surface unevenness is obtained by linearly moving the tip of the detector in contact with the surface unevenness. At this time, the measurement distance of the detector was 4.8 mm, and the moving speed was 0.5 cm / s.

Haze means the degree of cloudiness and represents the degree of transparency of glass, plastic, liquid, or the like. The haze value H (unit:%) is calculated from the mathematical formula (3). In Equation (3), τd represents diffuse transmittance, and τt represents total light transmittance.

The haze value is obtained as the sum of scattering due to irregularities on the surface of the antiglare layer 16 (external scattering) and scattering inside the antiglare layer 16 (internal scattering). For example, when organic fine particles are contained inside the antiglare layer 16, the haze value is caused by internal scattering due to the difference in refractive index between the fine particles and the resin layer serving as a binder, even if the surface has no uneven structure. Is measured.

The haze value in the present embodiment is measured using HM-150 manufactured by Murakami Color Research Laboratory. The haze measurement may be performed directly in the state of a polarizing plate or a front plate including a film having the antiglare layer 16 as long as there is no scattering component inside the measurement sample structure and is smooth, but it is precisely antiglare. In order to obtain the haze value of the layer 16, it is preferable to carry out in the state of a single film. Moreover, when obtaining the haze value for internal scattering, for example, an adhesive layer and a glass plate are sequentially laminated on the surface of the film having the antiglare layer 16, and the surface irregularities are buried in the adhesive layer. By measuring the haze value in this state, the haze value for the external scattering is not measured, and the haze value for only the internal scattering can be obtained.

Generally, the haze value of the antiglare layer provided on the front surface of a liquid crystal display device or the like is 1% or more and 30% or less. When the haze value exceeds 10%, the display image appears to be blurred white. On the other hand, by using the antiglare layer 16 having a haze value of 1 to 4%, a display image with a blackened color can be obtained. Therefore, the haze value of the antiglare layer 16 may be 1% or more and 10% or less.

The transmitted image definition is an evaluation value obtained by quantifying blur and distortion of light transmitted through the film. The transmitted image definition is calculated based on the amount of light in the bright and dark portions of the optical comb by measuring the transmitted light from the film through the moving optical comb. That is, when the film blurs the transmitted light, the slit image formed on the optical comb becomes thick, so that the amount of light at the transmissive portion is less than 100%, while the light leaks at the non-transmissive portion, and 0%. The value exceeds. The transmitted image definition C is defined by Equation (4) from the transmitted light maximum value M of the transparent portion of the optical comb and the transmitted light minimum value m of the opaque portion. That is, it can be said that the blur of the image by the film is smaller as the value of the transmitted image definition C approaches 100%.

In the present embodiment, the image clarity measuring instrument ICM-1 manufactured by Suga Test Instruments Co., Ltd. was used to measure the transmitted image definition C. The transmitted image definition may be measured directly in the state of a polarizing plate or a front plate including a film having the antiglare layer 16 as long as there is no scattering component inside the measurement sample structure and is smooth. In order to accurately determine the transmitted image clarity of the antiglare layer 16, it is preferably performed in the state of a single film.

The measuring machine is equipped with optical combs of 0.05, 0.125, 0.5, 1.0 and 2.0 mm, and the transmission image definition C can be measured in each optical comb. When there is a light scattering component such as fine particles in the sample, the amount of light at the transmission portion decreases as the width of the optical comb becomes smaller depending on the size of the scattering component. Therefore, it can be evaluated that the higher the transmitted image definition C is, the finer the concavo-convex structure of the antiglare layer 16 is, and the more the transmitted image is less blurred. Therefore, it is preferable that the transmitted image definition C has a higher value when the width of the optical comb is 0.05 mm and 0.125 mm. Specifically, the transmitted image definition C may be 40% or more and 70% or less when the width of the optical comb is 0.05 mm, and 70% or more and 90% or less when the width of the optical comb is 0.125 mm. . At this time, the transmitted image definition C in an optical comb having a width of 0.5 mm or more may have 80% or more.

In particular, when the antiglare layer 16 is attached to the front plate 100, the display image is displayed because there is a distance between the antiglare layer 16 and the display portion as compared with the case where the antiglare layer 16 is attached to the display portion of the information display device. Becomes easy to blur. Therefore, by setting the transmitted image definition C in the above preferable range, it is possible to make the display image of the display device clear while having an antiglare function.

Further, the transmitted image definition C can also be used as an index as to whether or not the antiglare layer 16 corresponds to a high-definition display device. When the transmitted image clarity C is smaller than the appropriate range, display glare is likely to occur, and when the transmitted image clarity C is larger than the above range, sufficient antiglare performance cannot be obtained. Here, the glare means that the uneven structure works as a lens, and the red (R), green (G), and blue (B) pixels of the display body can be seen or the brightness is uneven. It means a phenomenon that looks flickering. As the display device becomes higher definition, unevenness is relatively increased due to pixel miniaturization, and the problem of glare is easily revealed (https://www.daicel.com/research/features.html) .

As a method of integrally molding the film having the antiglare layer 16 and the resin 10, an injection molding method may be applied. There is an insert molding method for injection molding. In the insert molding method, a film (which may be a polarizing plate) having an antiglare layer 16 is cut or preformed into a desired shape in advance, and then placed in an injection mold, and simultaneously with the molding of the resin 10. In this method, the film is formed integrally with the resin 10. In the insert molding method, the resin and the polarizing plate can be attached simultaneously with the molding of the resin in the mold. Therefore, the manufacturing process can be greatly simplified. Further, in the insert molding method, the film is stretched by the injection pressure of the molten resin to follow the shape of the mold, so that the three-dimensional front plate 100 having a curved surface or the like can be easily manufactured.

In the insert molding method, an adhesive layer may be provided between the resin and the film having the antiglare layer 16 in order to improve the adhesiveness of the film having the resin 10 and the antiglare layer 16. For example, an adhesive layer may be provided when the support film 14 and the resin 10 are different materials. Examples of the adhesive used include polyacrylic resin and polyester resin. Polyacrylic resin or the like can obtain high adhesion to the resin, but the adhesive layer may be eluted by heat during integral molding, and the appearance of the front plate 100 may be significantly deteriorated. Therefore, the adhesive used may be an amorphous polyester resin. In this case, the adhesive layer is preferably provided in advance on one side of the film having the antiglare layer 16 by a coating apparatus or the like. The thickness of the adhesive layer is preferably 1 to 50 μm, more preferably 10 to 30 μm. As a result, it is possible to obtain the front plate 100 that is excellent in adhesion with the resin, further in conformity with the resin shape, and in appearance after integral molding.

In order to make it easy for the film having the antiglare layer 16 to follow the mold, an infrared heater, a nichrome heater or the like may be arranged in the vicinity of the film having the antiglare layer 16 and heated. However, when the polarizing film 18 is included in the film having the antiglare layer 16, it is not preferable to raise the mold temperature to an unnecessarily high temperature because the optical properties may deteriorate if exposed to a very high temperature. . Therefore, the temperature of the mold may be 50 ° C. or more and 100 ° C. or less, more preferably 50 ° C. or more and 80 ° C. or less. The film (or polarizing plate) having the antiglare layer 16 is fixed along a predetermined direction at a predetermined position in the molding die, and after closing the molding die, the resin 10 is melted from a gate provided in the stationary mold. Is injected into the cavity. The cylinder temperature may be a temperature range of 200 ° C. or more and 290 ° C. or less, for example, depending on the type of resin. The injection pressure of the resin 10 may be a pressure range of 70 MPa to 150 MPa. After the molten resin 10 is injected and filled in the cavity, the molded product is cooled, the mold is opened, and the molded product is taken out. Then, a film having an antiglare layer 16 at a specific position with respect to the resin 10 ( Alternatively, the front plate 100 in which the polarizing plate) is integrally formed can be manufactured.

Further, when the polarizing plate is integrally formed on the front plate 100, a film having the antiglare layer 16, the polarizing film 18, and the resin 10 may be laminated in order from the viewing side through an adhesive layer or the like. Or you may laminate | stack the film which has the glare-proof layer 16, resin 10, and the polarizing film 18 in order from the visual recognition side through an adhesive layer. At this time, it is preferable to use a polarizing plate in which a film having the antiglare layer 16 is bonded to the polarizing film 18 as the support film 14 as described above. In this case, the polarizing plate is outside the display device, that is, the viewing side of the front plate 100. Thereby, when the front plate 100 is formed integrally, the number of films and the number of steps can be reduced.

In addition, when laminating the polarizing film 18 and the resin 10 sequentially on the front plate through the adhesive layer from the viewing side, the resin 10 is disposed between the polarizing film 18 and the polarizing layer on the display device side. For this reason, the optical anisotropy of the resin 10 developed by injection molding causes optical axis misalignment, display image unevenness, and the like, and it may not be possible to extract light emitted from the display device to the maximum extent.

Therefore, in the case of the above-described lamination, it is preferable to use a resin 10 that is molecularly designed so as not to have retardation (or to be almost zero). For example, commercially available zero birefringence transparent acrylic resin Hyperlite (trademark registered) manufactured by Kaneka Corporation can be used.

Furthermore, in the injection molding process, when the molten resin 10 is filled from the gate, generally, the resin 10 is oriented to the inflow direction, which is a factor causing the optical anisotropy. Therefore, for example, it is preferable to optimally design the size, position, and number of gates, and it is preferable to optimally control processing conditions such as the melting temperature and inflow speed of the resin. By using the resin 10 thus obtained, the front plate 100 having the polarizing film 18 on the viewing side can be attached to the front surface of the display device.

On the other hand, when the influence due to the optical anisotropy of the resin 10 is not eliminated, the front plate 100 sequentially connects the film having the antiglare layer 16, the resin 10, and the polarizing film 18 from the viewing side through the adhesive layer. It is preferable to laminate.

In the present embodiment, the injection molding method has been described as a method of integrally molding the front plate 100. However, a method of bonding a film (or a polarizing plate) having the antiglare layer 16 to the surface of the molded resin 10 is described. May be used.

Further, the film (or polarizing plate) having the antiglare layer 16 on the front plate 100 need not be provided on the entire surface of the resin 10. 1 and 2 show an embodiment in which a film (or a polarizing plate) having the antiglare layer 16 is formed on the entire surface of the resin 10, but these are only examples schematically shown.

Hereinafter, the present disclosure will be described more specifically with reference to examples, but the present disclosure is not limited to such examples.

[Example 1]
<Manufacture of polarizing film 18>
A polyvinyl alcohol resin film (VF-PS (75 μm) manufactured by Kuraray Co., Ltd.) was swollen in water at 30 ° C. for 5 minutes, and then dyed at 30 ° C. (1000 parts by weight of water and 1 part by weight of sodium tripolyphosphate). 0.3 parts by weight of commercially available azo compound CI Direct Red 81, 0.7 parts by weight of azo compound KAYAFECT BLUE KW manufactured by Nippon Kayaku Co., Ltd., and 0.1% of commercially available CI Direct Orange 39 3 parts by weight in a commercially available azo compound CI Direct Violet 9 containing 0.06 parts by weight) was dyed with a dye for 5 minutes. Subsequently, the film was stretched 4 to 5 times in a 3% by weight boric acid aqueous solution at 50 ° C. to obtain a stretched film. After the stretching treatment, the stretched film was immersed in a 5 wt% boric acid aqueous solution at 50 ° C. for 2 minutes, washed with water, and dried in air at 30 to 80 ° C. to obtain a neutral gray polarizing film 18. The thickness of the obtained polarizing film 18 was 30 μm.

The obtained polarizing film 18 was measured using a spectrophotometer U-4100 manufactured by Hitachi, Ltd. As a result, the single transmittance Ys was 30% and the polarization degree Py was 99%.

<Preparation of film having antiglare layer 16>
25.87 parts by weight of dipentaerythritol hexaacrylate (manufactured by Nippon Kayaku Co., Ltd., DPHA), 0.35 parts by weight of acrylic (manufactured by Negami Kogyo Co., Ltd., M-5001), Irgacure 184 (as a polymerization initiator) Ciba Specialty Chemicals Co., Ltd.) 2.24 parts by weight, Irgacure 907 (Ciba Specialty Chemicals Co., Ltd.) 0.56 parts by weight, diethanolamine 0.56 parts by weight as a curing accelerator, Dissolved in 70 parts by weight of pentanone. This solution was applied to one side of a triacetyl cellulose film (80 μm) by a micro gravure coating method, the solvent was evaporated at 80 ° C., and then cured by irradiating light with an 80 W / cm high pressure mercury lamp. A film having an antiglare layer 16 having an uneven structure was obtained. The film thickness of this antiglare layer was about 6 μm.

When the obtained film having the antiglare layer 16 was observed with a transmission optical microscope, it had a droplet-like phase separation structure.

<Preparation of polarizing plate including film having antiglare layer 16>
A TAC film (thickness: 80 μm) was laminated on both surfaces of the polarizing film 18 with an aqueous adhesive containing polyvinyl alcohol (PVA) as a component, and then dried at 70 ° C. for 5 minutes to obtain a polarizing plate. At this time, a film having an antiglare layer 16 is used as the second support film 14b on one surface to be laminated, and a TAC film (TD80 made by Fuji Film) having no antiglare layer 16 is used on the other surface as the first support film 14a. Used as.

<Formation of adhesive layer>
A method for forming an adhesive layer for bonding the film (polarizing plate) having the antiglare layer 16 and the resin 10 will be described.

The adhesive layer can be obtained by providing a non-crystalline polyester resin adhesive (byron manufactured by Toyobo Co., Ltd.) on the support film 14 on the side where the antiglare layer 16 is not provided in the polarizing plate. Specifically, an amorphous polyester resin was used as the main agent, cyclohexanone was added as a diluent, and isocyanate was added as a curing agent. An adhesive was produced in which the amorphous polyester resin was 1, and cyclohexanone was mixed at a ratio of 0.33 and isocyanate at a ratio of 0.04. Next, the blended adhesive was applied on a release film, and the solvent was volatilized in the drying step. In the drying step, the solvent was volatilized from the release film coated with the adhesive using a plurality of drying furnaces each set in a temperature range of 40 ° C to 100 ° C. At this time, the coating amount was adjusted so that the thickness of the coating layer after drying was 15 μm or more and 30 μm or less. Then, the application surface was bonded together toward the 1st support film 14a without the glare-proof layer 16 of a polarizing plate.

<Manufacture of front plate 100>
Using an injection molding machine, integral molding of a polarizing plate including a film having the antiglare layer 16 and a molded product of the resin 10 was performed. The polarizing plate was fixed inside the mold of the molding machine by suction. At this time, the release film provided on the adhesive layer is peeled off, and the mold is so that the antiglare layer 16 of the polarizing plate contacts the mold surface, while the adhesive layer surface is on the side of the injected resin 10. Sandwiched between. A PMMA resin (Parapet HR-L manufactured by Kuraray Co., Ltd.) in a melted state at a cylinder temperature of 200 ° C. to 290 ° C. is poured into the front plate 100 in which a polarizing plate is integrally formed with a transparent resin 10. Manufactured. By keeping the mold temperature at 50 to 100 ° C., it was possible to make the polarizing plate conform to the shape of the mold. The total thickness of the front plate 100 obtained from this was 2 mm.

[Example 2]
<Preparation of film having antiglare layer 16>
The adhesive produced in Example 1 was applied on the release film, and the solvent was volatilized in the drying step. In the drying step, the solvent was volatilized from the release film coated with the adhesive using a plurality of drying furnaces each set in a temperature range of 40 ° C to 100 ° C. At this time, the coating amount was adjusted so that the thickness of the coating layer after drying was 15 μm or more and 30 μm or less. Then, the said application surface was bonded together toward the surface without the glare-proof layer 16 of the TAC film with glare-proof property (PFT80 000HNP by Daicel Chemical Industries).

<Preparation of front plate 100>
Using an injection molding machine, the film having the antiglare layer 16 and the molded product made of the resin 10 were integrally formed. The film was fixed inside the mold of the molding machine with adhesive tape or suction. At this time, the release film provided on the adhesive layer is peeled off, and the antiglare layer 16 of the film is in contact with the mold surface, while the adhesive layer surface is on the side of the resin 10 to be injected. I caught it. PMMA resin (Parapet HR-L manufactured by Kuraray Co., Ltd.) melted at a cylinder temperature of 200 ° C. to 290 ° C. is poured into the front plate 100 in which the film is integrally formed with the transparent resin 10. Manufactured. By keeping the mold temperature at 50 to 100 ° C., it was possible to make the film conform to the shape of the mold. The total thickness of the front plate 100 obtained from this was 2 mm.

[Comparative Example 1]
7.5 parts by weight of silica fine particles having an average secondary particle diameter of 1.0 μm and a standard deviation of the average secondary particle diameter of 0.5 μm, and 5 parts by weight of a photopolymerization initiator (Irgacure 184, manufactured by Ciba Geigy) An ultraviolet curable acrylic resin containing 50 parts by weight of pentaerythritol hexaacrylate, 30 parts by weight of pentaerythritol triacrylate, and 20 parts by weight of N-vinyl-ε-caprolactam is prepared. The acrylic resin was stirred at a high speed in a solvent in which 100 parts by weight, toluene and isopropyl alcohol were mixed, and then 1.3 parts by weight of hydroxypropyl cellulose was added to the mixed solution of toluene and isopropyl alcohol, so that the solid content was 50. A dispersion was prepared so as to have a weight%. It was applied to one side of a 80 μm thick triacetyl cellulose film by a micro gravure coating method, the solvent was evaporated at 80 ° C., and then cured by irradiation with light with an 80 W / cm high pressure mercury lamp. A film having an antiglare layer having a glare layer thickness of about 4 μm was obtained.

A polarizing plate was produced in the same manner as in Example 1 using the obtained film having an antiglare layer. That is, the formation of the adhesive layer and the molding process with the resin were performed in the same manner as described in Example 1. However, in the antiglare layer, a curable resin having irregularities on the surface mixed with fine particles was formed on the TAC film.

[Comparative Example 2]
As a TAC film with antiglare properties, a polarizing plate was produced in the same manner as in Example 1 using DSR3 manufactured by Dai Nippon Printing. That is, the formation of the adhesive layer and the molding process with the resin were performed in the same manner as described in Example 1. In the antiglare layer, a curable resin having irregularities on the surface mixed with fine particles was formed on the TAC film.

[Haze measurement]
The haze values of the antiglare polarizing plates obtained in Example 1 and Comparative Examples 1 and 2 were measured. For the measurement of the haze value, HM-150 manufactured by Murakami Color Research Laboratory was used. Table 1 shows the measurement results of haze values. In both Example 1 and Comparative Examples 1 and 2, the haze value of the antiglare polarizing plate was almost the same as that of the film having an antiglare layer alone. In addition, the haze measurement after integral molding measured the thing of the state which isolated the polarizing plate with glare-proof from the resin part, and removed the remaining contact bonding layer completely.

The front plate 100 in Example 1 had almost no change in haze value before and after integral molding with the resin, compared to the front plates of Comparative Examples 1 and 2. Moreover, when the haze value for the internal scattering of the antiglare layer was measured by the above-described method, Example 1 and Comparative Example 1 had almost no internal scattering haze, but Comparative Example 2 had a haze of about 20%. Had a value.

[Transmission image clarity measurement]
The transmitted image clarity of the antiglare polarizing plates produced in Example 1 and Comparative Examples 1 and 2 was measured. For the measurement of transmitted image clarity, image clarity measuring device ICM-1DP manufactured by Suga Test Instruments Co., Ltd. was used. For the measurement, a sample piece measured by haze measurement was used. In any of Example 1 and Comparative Examples 1 and 2, the transmitted image definition of the polarizing plate with antiglare property was almost the same as that of the film having the antiglare layer alone. Table 2 shows the measurement results of the transmission image definition.

In the front plate 100 of Example 1, the transmitted image definition was hardly changed before and after the integral molding with the resin, compared to the front plates of Comparative Examples 1 and 2.

[Surface roughness]
The surface roughness of the antiglare polarizing plate produced in Example 1 and Comparative Examples 1 and 2 was measured. For the measurement of the surface roughness, a surf test SJ-310 manufactured by Mitutoyo Corporation was used. For the measurement, a sample piece measured by haze measurement was used. Table 3 shows the measurement results of the surface roughness.

The front plate 100 of Example 1 had almost no change in surface roughness before and after integral molding with the resin, compared to the front plates of Comparative Examples 1 and 2.

Example 1 and Comparative Example 2 were smaller than Comparative Example 1 and showed close values for arithmetic average roughness (Ra) and root mean square height (Rq) before molding. This indicates that the antiglare layer of Comparative Example 2 has a fine surface structure equivalent to the antiglare layer 16 of Actual Example 1. However, the maximum height (Rz) after the molding process is almost unchanged in Example 1, whereas Comparative Examples 1 and 2 are greatly reduced. This is considered to be because the convex portions of the antiglare layer were crushed by the molding process in Comparative Examples 1 and 2, and it can be said that the collapse of the convex portions was suppressed in Example 1.

When the anti-glare layer is formed by mixing conventional organic or inorganic fine particles and a curable resin as in Comparative Examples 1 and 2, the surface irregularities are expressed as "sea and islands". The portions are interspersed and the heights of the convex portions are not uniform. In such a structure, the pressure is concentrated on the convex portion during the integral molding process, the convex portion is crushed, and the originally designed anti-glare performance is diminished.

On the other hand, when the film having the antiglare layer 16 having the unevenness having the phase separation structure as in Example 1 was used, the antiglare performance was hardly changed even after the integral molding process. This is thought to be because, in the phase separation structure, the convex portions are continuously connected, and the height of the convex portions is substantially uniform, the pressure applied to the convex portions is dispersed during integral molding, and the deformation of the convex portions is reduced. .

[Evaluation of glare]
The front plate manufactured in Example 1 and Comparative Examples 1 and 2 was evaluated for display image glare. As a high-definition display device, the front plate manufactured in Example 1 and Comparative Examples 1 and 2 on the tablet iPad (registered trademark) MD513J / A (resolution: 264 ppi) manufactured by APPLE is set so that the antiglare layer is on the viewer side. installed. At this time, the display image of the tablet was set to green. The distance between the front plate and the display image portion was changed from 0 to 10 cm, and the presence or absence of glare when the display image was visually observed through the front plate was evaluated.

[Evaluation of display clarity]
In the same manner as described above, the blur of the display image was evaluated for the front plates manufactured in Example 1 and Comparative Examples 1 and 2. The front plate manufactured in Example 1 and Comparative Examples 1 and 2 was placed on a tablet iPad (registered trademark) MD513J / A manufactured by APPLE so that the antiglare layer was on the viewing side. At this time, the display image of the tablet displayed a test chart in which characters and white to black are indicated by gradation in stages. The distance between the front plate and the display unit was set to 0 to 10 cm, and the appearance when the display image was visually observed through the front plate was evaluated. In addition, although the distance of the front plate in this evaluation and a display part assumes the range to which the front plate of a display apparatus is applied in vehicle mounting, it is not limited to this.

In Comparative Example 1, the display image was glaring when the distance from the display device was short. The glare was eliminated by increasing the distance, but the display image became invisible because of the low transparency of the transmitted image. In Comparative Example 2, the glare-proof layer 16 is high definition compatible, and the transmitted image definition is high, so that glare hardly occurs. However, the image became whitish due to the haze caused by internal scattering. On the other hand, in Example 1, the glare was small and high sharpness was maintained regardless of the distance from the display device.

From the above test results, the front plate 100 in the present embodiment hardly loses the anti-glare performance after the integral molding with the resin 10 and can maintain the originally designed anti-glare performance. Further, even when used in a high-definition information display device, glare can be suppressed and a display device having high definition can be obtained.

10 resin (resin layer), 12 adhesive layer, 14 (14a, 14b) support film, 16 anti-glare layer, 18 polarizing film, 20 transmittance, 100 front plate.

Claims

A front plate of a display device,
A film provided with an antiglare layer having a phase-separated structure having irregularities and a resin are integrally formed, and the antiglare layer is disposed on the viewing side.
A front plate of the display device according to claim 1,
The antiglare layer includes at least one thermoplastic resin and a cured product of at least one curable resin, and includes a phase separation structure of the thermoplastic resin and the curable resin.
A front plate of the display device according to claim 2,
The curable resin contains at least one selected from an acrylic resin, a polymethyl methacrylate resin, and a polycarbonate resin.
A front plate of a display device according to any one of claims 1 to 3,
The film is
A polarizing film containing a dichroic dye;
A support film sandwiching both sides of the polarizing film;
With
At least one of the support films includes the antiglare layer.
A front plate of a display device according to any one of claims 1 to 4,
The antiglare layer has a haze value of 1% or more and 10% or less,
The antiglare layer has a transmitted image definition of 40% or more when the optical comb width is 0.05 mm, and a transmitted image definition of 70% or more when the optical comb is 0.125 mm.
A front plate of a display device according to any one of claims 1 to 5,
The antiglare layer is
The difference in change between the haze value before integrally molding the film and the resin and the haze value after integral molding is 1.5% or less,
Ratios of change in arithmetic mean roughness, root mean square height, and maximum height in the surface roughness before the film and the resin are integrally molded and the surface roughness after the integral molding are each 10% or less.
A front plate of a display device according to any one of claims 1 to 6,
The resin is a gray smoke resin having a transmittance of 20 to 70%.
A front plate of a display device according to any one of claims 1 to 7,
An adhesive layer is provided between the antiglare layer and the resin,
The adhesive layer includes amorphous polyester.
A display device,
A front plate according to any one of claims 1 to 8 is provided.
An in-vehicle information display device,
A front plate according to any one of claims 1 to 8, which is used in a display device mounted on a vehicle.