WO2013084718A1

WO2013084718A1 - Display with outer surfacing member, and anti-newton ring sheet

Info

Publication number: WO2013084718A1
Application number: PCT/JP2012/080192
Authority: WO
Inventors: 京春金; 亮平早川; 和洋野澤; 好央岡本; 益生小山
Original assignee: 株式会社きもと
Priority date: 2011-12-06
Filing date: 2012-11-21
Publication date: 2013-06-13
Also published as: CN103959361A; JPWO2013084718A1; JP6087292B2; KR101949554B1; KR20140099502A; TW201323209A; TWI601638B

Abstract

[Problem] To provide a technology that simultaneously prevents Newton rings and sparkling. [Solution] Outer surfacing members are arranged at an interval on a display (1). Said outer surfacing members comprises an uneven layer (21) that contains particles and a binder resin on the surface opposite the display (1). The particles have anisotropy with the aspect ratios of 1.2 to 2.0. A display (4) with the outer surfacing members has the particles that exist in the uneven layer (21) with the longitudinal direction intersecting with thickness direction of the uneven layer (21).

Description

Display with surface member and Newton ring prevention sheet

The present invention relates to a display with a surface member in which the surface member is disposed on the display, and a Newton ring prevention sheet used therefor.

A plate-like article (surface member) obtained by laminating an interference fringe elimination (Newton ring prevention) sheet in which a concavo-convex layer made of a cured film is formed on a transparent film to an acrylic plate or the like, an image display device (plasma display device or A technique (air gap type) is known in which a gap is formed on the front surface of a liquid crystal display device or the like and an uneven layer is opposed (Patent Document 1).

JP-A-10-283122

The technique of Patent Document 1 forms a plurality of protrusions formed mainly by particles in an uneven layer. As a result, even if a part of the surface member is bent, the distance between the uneven layer and the image display device is maintained at a certain level or more by the plurality of convex portions, thereby preventing Newton's ring.

However, in the concavo-convex layer of the technique of Patent Document 1, a so-called sparkle occurs in which the RGB emission points are enlarged and emphasized by the lens action of the convex portion, and the visibility is not sufficient.

In one aspect of the present invention, there is provided a technology that can satisfy both the Newton ring prevention property and the sparkle prevention property at the same time.

The display with a surface member of the present invention is formed by disposing a surface member at an interval on the display, and the surface member has an uneven layer containing particles and a binder resin on the surface facing the display. The Newton ring prevention sheet of this invention has an uneven | corrugated layer containing particle | grains and binder resin.

In both the inventions, the particles have an anisotropy with an aspect ratio of 1.2 or more and 2.0 or less, and the particles are aligned along the direction in which the major axis direction intersects the thickness direction of the uneven layer. Is present in the concavo-convex layer.

The present invention includes the following aspects.
The display with a surface member and the Newton ring prevention sheet of the present invention can use particles having a curved surface portion on the surface, and the curved surface portion is elliptical.
In the display with a surface member and the Newton ring prevention sheet of the present invention, the content of particles in the uneven layer can be 0.5 parts by weight or more and 5.0 parts by weight or less with respect to 100 parts by weight of the binder resin. .

In the display with a surface member and the Newton ring prevention sheet of the present invention, particles having an average particle diameter of 0.5 μm or more and 8.0 μm or less can be used.
The display with a surface member and the Newton ring prevention sheet of the present invention have a thickness of 0.1 μm or more and 3.0 μm or less, and unevenness of 0.2 to 0.8 times the average particle diameter of contained particles. Layers can be used.
The “average particle size” is calculated by converting the particle volume measured by the Coulter counter method into a sphere.

In the display with a surface member and the Newton ring prevention sheet of the present invention, an uneven layer having a difference in refractive index between the binder resin portion and the particle portion within 0.2 can be used.
In the display with a surface member of the present invention, a touch panel or a protective plate can be used as the surface member.

The Newton ring-preventing sheet of the present invention can be used in a direction in which a concavo-convex layer is arranged on the surface of the surface member arranged on the display at an interval so as to face the display.

The display with a surface member of the present invention configured by disposing a surface member with a space on the display has a concavo-convex layer containing particles having a special shape and a binder resin on the surface of the surface member facing the display. For this reason, even if a part of surface member bends, the space | interval of an uneven | corrugated layer and a display is kept more than fixed, and this prevents a Newton ring. In addition, since the irregular layer is formed by containing specially shaped particles, the angular distribution of the refracted light when passing through the convex portion centered on the particles can be narrowed. As a result, it contributes to prevention of pixel disturbance, that is, occurrence of sparkle, which occurs due to the wide angular distribution of refracted light.
That is, the display with a surface member of the present invention can satisfy both Newton ring prevention and sparkle prevention simultaneously.

The Newton ring prevention sheet of the present invention has an uneven layer containing special particles and a binder resin. For this reason, when the Newton ring prevention sheet of the present invention is used in a direction in which the uneven layer is disposed on the surface of the surface member that is arranged on the display at a distance from the surface, a part of the surface member is Even if it bends, the same effect as described above can be obtained. That is, the Newton ring preventing sheet of the present invention can simultaneously satisfy both the Newton ring preventing property and the sparkle preventing property, like the display with the surface member.

FIG. 1 is a cross-sectional view showing an example of a display with a surface member of the present invention. FIG. 2 is a cross-sectional view showing another example of the display with a surface member of the present invention. FIG. 3A and FIG. 3B are diagrams for explaining the difference in the degree of occurrence of sparkle due to the difference in particles.

4, 4a ... Display with surface member, 1 ... Display, 2 ... Member body (surface member), 21 ... Uneven layer (surface member), 3 ... Newton ring prevention sheet, 31 ... Uneven layer, 32 ... Transparent substrate, 33 ... adhesive layer.

As shown in FIG. 1 and FIG. 2, the displays 4 and 4 a with a surface member of this example are configured by disposing a surface member on the display 1 with a space. Examples of the display 1 include a liquid crystal display device, a CRT display device, a plasma display device, and an EL display device.

The surface member of this example is not particularly limited in its structure. For example, as shown in FIG. 1, the laminated structure which has the uneven | corrugated layer 21 directly formed in the surface of the member main body 2 may be sufficient. Further, for example, as shown in FIG. 2, sticking in which the transparent base material 32 side of the Newton ring prevention sheet 3 having the uneven layer 31 on the transparent base material 32 is bonded to the surface of the member body 2 through the adhesive layer 33. It may be a structure. That is, in this example, as a surface member, the laminated body (FIG. 1) of the member main body 2 and the uneven | corrugated layer 21 and the bonding body (FIG. 2) of the member main body 2, the contact bonding layer 33, and the Newton ring prevention sheet 3 are illustrated. Hereinafter, when it says "surface member", it shall mean either these laminated bodies and a bonding body.

Examples of the transparent substrate 32 include polyethylene terephthalate, polybutylene terephthalate, polyethylene naphthalate, polycarbonate, polyethylene, polypropylene, polystyrene, triacetyl cellulose, and acrylic. Among these, a polyethylene terephthalate film that has been stretched, in particular biaxially stretched, is preferred because of its excellent mechanical strength and dimensional stability. Moreover, you may use what improved the adhesiveness with the uneven | corrugated layer 31 by giving a corona discharge process to the surface of the transparent base material 32, or providing an easily bonding layer. The thickness of the transparent substrate 32 is generally 25 to 500 μm, preferably 50 to 200 μm.

In order to dispose the surface member of this example on the display 1 with a space, for example, the surface member is fixed facing the display 1 with a double-sided tape or adhesive around the uneven layer 21, 31 side. do it. The distance between the surface member and the display 1 is usually about 50 μm to 5 mm, although it depends on the size of the display 1 and the type of the member body 2 constituting the surface member.

As the member main body 2 of this example, a protective plate, a touch panel, or the like can be given. Among the member main bodies 2, those having flexibility are such that the distance between the member main body 2 and the display 1 is partially narrowed when touched with a finger, and light interference fringes due to a thin layer of air sandwiched between them. (Newton ring) is likely to occur. For this reason, this invention exhibits a remarkable effect with respect to the member main body 2 of the type which has flexibility especially.

The protective plate as an example can be constituted by a transparent resin plate represented by an acrylic resin plate, for example. The thickness of the protective plate is usually about 0.1 to 2.0 mm.

The method of the touch panel as an example is not particularly limited, and can be configured by, for example, a resistive touch panel, a capacitive touch panel, or the like. These touch panels are shifting from glass substrates to plastic substrates due to the demand for weight reduction. For this reason, recent touch panels belong to a flexible type member. Therefore, it is easy to bend at the time of operation, and when this is used for the member main body 2, it is easy to produce a Newton ring between the display 1. FIG. From the above, a touch panel is used as the member body 2, and the uneven layer 21 shown in FIG. 1 is laminated on the display surface side of the display 1 which is the lower part thereof, or Newton is provided via the adhesive layer 33 as shown in FIG. Arranging the ring prevention sheet 3 downward (direction in which the uneven layer 31 faces the display surface side of the display 1) is extremely effective in preventing Newton rings that may occur during touch panel operation.

The resistive film type touch panel as an example includes, for example, an upper electrode having a transparent conductive layer on one surface of a transparent substrate and a lower electrode having a transparent conductive layer on one surface of the transparent substrate. The transparent conductive layers of the lower electrode are opposed to each other, and a spacer is interposed therebetween. In this example, the uneven layer 21 may be directly formed on the transparent substrate of the lower electrode for such a resistive touch panel. Or the transparent base material 32 side of the Newton ring prevention sheet 3 can also be bonded together and formed in the transparent substrate of a lower electrode.

The capacitive touch panel as an example includes, for example, a plurality of sensor traces of a transparent resistor formed in a first dimension, a plurality of sensor traces of a transparent resistor formed in a second dimension, and a gap therebetween. A transparent insulating material that is formed is provided as a basic configuration. Moreover, it is preferable to have an insulator layer on at least one of the transparent resistors. In this example, the uneven layer 21 may be directly formed on the transparent resistor of one dimension with respect to such a capacitive touch panel. Or you may form the uneven | corrugated layer 21 directly on the insulator layer on the transparent resistor of one dimension. Alternatively, the Newton ring prevention sheet 3 can be formed by sticking the transparent base material 32 side onto a one-dimensional transparent resistor or insulator layer.

The uneven layers 21 and 31 of this example contain particles having a special shape and a binder resin.
The particles contained in the uneven layers 21 and 31 are not particularly limited as long as the aspect ratio thereof is 1.2 or more and 2.0 or less, preferably 1.8 or less. For example, rugby ball shape, mushroom shape, flat shape, oval shape, spheroid shape and the like can be mentioned. The particles used in this example include not only primary particles but also aggregates (secondary particles) of several particles. Therefore, the range of the aspect ratio is based on primary particles or secondary particles.
As a commercial item corresponding to the specially shaped particles, for example, trade name “Techpolymer” (Sekisui Chemicals Co., Ltd.) exists.

The term “anisotropic” means that the particles are not isotropic but physically oriented, that is, the particles used in this example have an aspect ratio in the above predetermined range. Yes. “Aspect ratio” means the ratio of the length and width of a circumscribed rectangle (the smallest rectangle when a particle figure is surrounded by a rectangle), and this value can be measured by, for example, a particle size distribution image analyzer.

In this example, the surface layers of this example including the uneven layers 21 and 31 are arranged on the display 1 with an interval by including the irregularly shaped layers 21 and 31 by containing particles of special shapes, and thereafter Even if the surface member is touched and, as a result, the distance between the member main body 2 constituting the surface member and the display 1 becomes narrow, it is possible to satisfy both the prevention of Newton ring and the prevention of sparkle.

The reason why both the Newton ring and sparkle events can be prevented when the specially shaped particles are contained in the concavo-convex layers 21 and 31 is as follows.

The light generated from the display 1 is normally refracted when passing through a convex portion centered on particles. Here, when a nearly spherical particle (corresponding to a comparative example of the present invention) having an aspect ratio of less than 1.2 is used, as shown in FIG. 3A, the angular distribution of the light refracted by the convex portion becomes wide. . On the other hand, when particles having an aspect ratio of 1.2 or more (corresponding to the embodiment of the present invention) are used, the angular distribution of light refracted by the convex portion becomes narrow as shown in FIG. This difference is influenced by the difference in the slope of the convex portion due to the aspect ratio. “Sparkle” is a phenomenon in which a pixel is disturbed due to light being refracted at a convex portion. However, when the aspect ratio is 1.2 or more, the angle distribution of the refracted light can be narrowed, so that the disturbance of the pixel can be reduced. It is thought that it is possible (it can make it hard to produce a sparkle).

On the other hand, Newton's ring prevention property is an effect obtained by forming a convex portion with particles and maintaining a distance from the opposing surface. For this reason, particles having an aspect ratio of 1.2 or more also have this effect. However, when the aspect ratio exceeds 2.0, the distance from the facing surface cannot be sufficiently maintained depending on the orientation of the particles, and Newton's ring prevention property becomes insufficient. Therefore, in this example, the upper limit of the aspect ratio is 2.0. Note that the upper limit of the aspect ratio is preferably 1.8 from the viewpoint of obtaining a relatively sufficient Newton ring prevention property.

As the particles used in this example, particles made of any of inorganic (inorganic particles) and organic (resin particles) can be used. In particular, the resin particles are preferable in that the difference in refractive index from the binder resin can be easily reduced, thereby making it possible to easily prevent the whitishness and sparkle of the coating films (uneven layers 21 and 31). Examples of the inorganic particles include silica, alumina, talc, clay, calcium carbonate, magnesium carbonate, barium sulfate, aluminum hydroxide, titanium dioxide, and zirconium oxide. Examples of the resin particles include acrylic resin particles, silicone resin particles, nylon resin particles, styrene resin particles, polyethylene resin particles, benzoguanamine resin particles, and urethane resin particles.

The particles used in this example have an average particle size of preferably 0.5 μm or more, more preferably 0.8 μm or more, further preferably 1.5 μm or more, particularly preferably 2.0 μm or more, and most preferably 2.5 μm or more. It is. By using particles having a special shape (range of the above aspect ratio) and an average particle diameter of 0.5 μm or more, it is easy to cause the uneven layers 21 and 31 to exhibit a Newton ring prevention effect. The average particle diameter is preferably 8.0 μm or less, more preferably 5.0 μm or less, further preferably 4.0 μm or less, particularly preferably 3.0 μm or less, and most preferably 2.7 μm or less. By using particles having a special shape and an average particle diameter of 8.0 μm or less, it is easy to cause the uneven layers 21 and 31 to exhibit a sparkle-preventing action. The “average particle size” is calculated by converting the particle volume measured by the Coulter counter method into a sphere. Therefore, in the specially shaped particles used in this example, the value on the long diameter side is larger than the value on the average particle diameter, and the value on the short diameter side is smaller than the average particle diameter.

The particles used in this example preferably include a curved surface portion on the surface, and the curved surface portion is preferably elliptical. By including a curved surface portion on the surface of the particle, it is possible to easily prevent damage to the member main body 2 facing the uneven layers 21 and 31. In addition, when the curved surface portion is elliptical, the angle distribution of the light refracted by the convex portion can be narrowed and sparkle is less likely to occur than when the curved surface portion is a perfect circle.

It should be noted that “the particle surface includes a curved surface portion” means that at least a part of the particle surface may be a curved surface. Even if it has a flat portion on the surface of the particles, it may have another curved portion.

The content of the particles used in this example is preferably 0.5 parts by weight or more, more preferably 1.0 parts by weight or more, preferably 5.0 parts by weight or less, with respect to 100 parts by weight of the binder resin. More preferably, it is 4.0 weight part or less, More preferably, it is 3.0 weight part or less, Most preferably, it is 2.5 weight part or less. By making the content in the concavo-convex layers 21 and 31 5.0 parts by weight or less, it is easy to improve the sparkle prevention and transparency, and by making the content 0.5 parts by weight or more, Newton rings are generated. Easy to prevent.

As binder resins, polyester resins, acrylic resins, acrylic urethane resins, polyester acrylate resins, polyurethane acrylate resins, epoxy acrylate resins, urethane resins, epoxy resins, polycarbonate resins, cellulose resins, acetals Resin, vinyl resin, polyethylene resin, polystyrene resin, polypropylene resin, polyamide resin, polyimide resin, melamine resin, phenolic resin, silicone resin, fluorine resin, thermoplastic resin, heat Examples thereof include curable resins and ionizing radiation curable resins. Among these, ionizing radiation curable resins having excellent surface hardness are preferable.

The concavo-convex layers 21 and 31 of this example may further contain additives such as a leveling agent, an ultraviolet absorber, and an antioxidant.

In order to form the concavo-convex layers 21 and 31 of this example, for example, a binder resin is dissolved and a coating liquid containing appropriate components is applied to the surface of the member body 2 or the transparent substrate 32, and then dried. And removing the solvent to form a resin film. At that time, the particles having the special shape described above may be applied by being dispersed in a resin coating solution. Alternatively, a resin coating liquid different from the binder resin coating liquid may be prepared, and this coating liquid may be applied to the surface of the member body 2 or the transparent substrate 32. The solvent used in the coating liquid may be any solvent as long as it can be used as a coating liquid for coating, and any solvent can be used.
As a method for coating the concavo-convex layers 21, 31, any method for coating the surface of the member main body 2 or the transparent substrate 32 with a coating liquid can be used. For example, a bar coater, a die coater, a blade coater, a spin coater , Roll coater, gravure coater, flow coater, spray, screen printing and the like.

In this example, one or more coating liquids containing binder resin and particles, which are selected so that the difference in refractive index between the binder resin portion and the particle portion in the concavo-convex layers 21 and 31 is within 0.2, are used. The concavo-convex layers 21 and 31 are preferably coated.
Irregular layers 21 and 31 formed after such a coating liquid is applied to the member body 2 or the transparent substrate 32 and dried, or irregular layers 21 and 31 formed after the coating liquid is applied and dried and then irradiated with ionizing radiation, In FIG. 31, when the difference in refractive index between the binder resin portion and the particle portion is within 0.2, the present inventors have confirmed that it is easy to prevent both the whiteness of the coating film and the sparkle. .
In addition, arbitrary methods can be used as a method of hardening the resin at the time of using ionizing radiation curable resin for binder resin. Among them, it is preferable to cure by UV irradiation to form a coating film. In that case, a light source such as a high pressure mercury lamp, a low pressure mercury lamp, an ultrahigh pressure mercury lamp, a metal halide lamp, a carbon arc, or a xenon arc can be used.

In the uneven layers 21 and 31 formed by the above method, the particles used in this example are arranged along the direction in which the major axis direction intersects (preferably orthogonally) the thickness direction of the uneven layers 21 and 31. It is preferable. Due to the peculiarity of the particle shape used in this example, after a while after the coating liquid is applied, it tries to become mechanically more stable, and the major axis direction intersects the thickness direction of the uneven layers 21 and 31. It remains on the surface of the member main body 2 or the transparent substrate 32 along the direction. By arranging the particles in the concavo-convex layers 21 and 31 in this way, Newton's ring can be prevented, and as shown in FIG. 3B, the angular distribution of the light refracted by the convex portion becomes narrower. As a result, pixel disturbance can be suppressed and sparkle can be prevented. That is, it is possible to achieve both prevention of occurrence of both Newton ring and sparkle events.

The thickness of the concavo-convex layers 21 and 31 (thickness of the portion consisting only of the binder resin excluding the particles) is preferably 0.1 μm or more, more preferably 0.5 μm or more, further preferably 0.8 μm or more, and particularly preferably 1. It is 0 μm or more, preferably 3.0 μm or less, more preferably 2.5 μm or less, further preferably 2.2 μm or less, and particularly preferably 1.8 μm or less. In particular, from the viewpoint of preventing the occurrence of Newton rings, it is preferably 0.8 times or less, more preferably 0.6 times or less, and even more preferably 0.5 times, based on the average particle diameter of the particles. The following. The thickness of the concavo-convex layers 21 and 31 is preferably 0.2 times or more, more preferably 0.3 times or more, and further preferably more than 0.4 times the average particle diameter of the above particles (more than 0.4 times). ) Is preferable in that it is easy to prevent the particles from falling off the uneven layers 21 and 31.

As described above, according to this example, the surface member (member main body 2 + uneven layer 21 or member main body 2+ adhesive layer 33 + Newton ring prevention sheet 3) is arranged on the display 1 with a space therebetween. The display with the surface member 4, 4 a has the uneven layers 21, 31 of this example on the surface of the surface member facing the display 1. For this reason, even if a part of surface member bends, the space | interval of the uneven | corrugated layers 21 and 31 and the display 1 is hold | maintained more than fixed, thereby preventing a Newton ring. In addition, since the irregular layers 21 and 31 are formed by containing specially shaped particles, the angular distribution of the refracted light when passing through the convex portion centered on the particles can be narrowed. As a result, it contributes to preventing the occurrence of pixel disturbance (sparkle) that occurs due to the wide angular distribution of refracted light. That is, the display 4 and 4a with the surface member of this example can satisfy the Newton ring prevention property and the sparkle prevention property at the same time.

Hereinafter, more detailed description will be given by giving more specific examples of the embodiment of the present invention. In this example, “parts” and “%” are based on weight unless otherwise specified.

[Example 1]
On one side of a 125 μm thick transparent polyester film (Cosmo Shine A4350: Toyobo Co., Ltd.), a coating liquid a having the following formulation was applied, dried, and irradiated with ultraviolet rays to form a concavo-convex layer having a thickness of 1.2 μm. A Newton ring prevention sheet was obtained. The difference in refractive index between the ionizing radiation curable resin and the particles blended in the coating solution of this example was within 0.2.

<Coating liquid a>
・ Ionizing radiation curable resin (solid content 80%) 42 parts (Unidic 17-813: DIC Corporation)
-Photopolymerization initiator 1.34 parts (Irgacure 651: Ciba Japan)
・ Acrylic resin particles 0.67 parts (Techpolymer 67BT: Sekisui Plastics, Rugby Ball)
(Average particle diameter: 2.64 μm, refractive index: 1.49, aspect ratio: 1.2 to 1.8)
(Oval curved surface)
・ 245 parts diluted solvent

[Example 2]
A Newton ring prevention sheet of this example was obtained in the same manner as in Example 1 except that the acrylic resin particles of the coating liquid a were changed to the following. The difference in refractive index between the ionizing radiation curable resin and the particles blended in the coating solution of this example was within 0.2.
・ Acrylic resin particles (Techpolymer 69BT: Sekisui Plastics, Mushroom)
(Average particle size: 2.53 μm, refractive index: 1.49, aspect ratio: about 1.2 to 1.6)
(The mushroom umbrella is an elliptical curved surface)

[Example 3]
A Newton ring prevention sheet of this example was obtained in the same manner as in Example 1 except that the acrylic resin particles of the coating liquid a were changed to the following. The difference in refractive index between the ionizing radiation curable resin and the particles blended in the coating solution of this example was within 0.2.
・ Acrylic resin particles (Techpolymer 68BT: Sekisui Plastics, hemisphere)
(Average particle diameter: 2.67 μm, refractive index: 1.49, aspect ratio 2.0)
(Circular curved surface)

[Example 4]
A Newton ring prevention sheet of this example was obtained in the same manner as in Example 1 except that the acrylic resin particles of the coating liquid a were changed to the following. The difference in refractive index between the ionizing radiation curable resin and the particles blended in the coating solution of this example exceeded 0.2.
・ Inorganic particles (silica)
(Rugby ball shape)
(Average particle size: 2.65 μm, refractive index: 1.46, aspect ratio: about 1.4 to 1.8)
(Designed to have an elliptical curved surface.)

[Comparative Example 1]
A Newton ring prevention sheet of this example was obtained in the same manner as in Example 1 except that the acrylic resin particles of the coating liquid a were changed to the following.
・ Acrylic resin particles (MX-300: Soken Chemical Industry Co., Ltd., spherical)
(Average particle diameter: 3.0 μm, refractive index: 1.49, aspect ratio 1.0)

[Comparative Example 2]
A Newton ring prevention sheet of this example was obtained in the same manner as in Example 1 except that the acrylic resin particles of the coating liquid a were changed to the following.
・ Acrylic-silicone hybrid resin particles (Silcurusta MK03: Nikko Rika Co., Ltd.)
(Average particle diameter: 3.0 μm, aspect ratio 1.0)

[Comparative Example 3]
A Newton ring prevention sheet of this example was obtained in the same manner as in Example 1 except that the acrylic resin particles of the coating liquid a were changed to the following.
・ Acrylic resin particles (rugby ball shape)
(Average particle diameter: 2.14 μm, refractive index: 1.49, aspect ratio 3.0)
(Designed to have an elliptical curved surface.)

[Production of display with surface members]
The Newton ring prevention sheet obtained in each example was bonded to the back surface of the capacitive touch panel via a commercially available adhesive (OCA: Optical Clear Adhesive). Next, a capacitive touch panel was installed on the liquid crystal display with a gap of 0.3 mm so that the concavo-convex layers were opposed to each other to obtain a display with a surface member of each example.

[Evaluation]
The following evaluation was performed about the display with a surface member or the Newton ring prevention sheet obtained by each example. The results are shown in Table 1.

1. Newton ring The appearance of Newton's ring when the touch panel surface of the display with a surface member was lightly touched with a finger was visually observed. As a result, the case where the Newton ring was not visible was indicated as “◯”, and the case where the Newton ring was visible as “x”.

2. Sparkle The liquid crystal display screen of the display with a surface member was displayed in green on the entire surface, and the occurrence of sparkle was visually observed. As a result, “◯” indicates that the sparkle was not visible, “△” indicates that the sparkle was slightly visible but did not hinder, and “x” indicates that the sparkle appeared intense.

In Examples 1 to 4, since the concavo-convex layer contained particles having an aspect ratio in the range of the present invention, it was possible to sufficiently suppress sparkle while having Newton ring prevention properties. In particular, those in Examples 1 and 2 were particularly excellent in suppressing sparkle because the particles contained in the concavo-convex layer included a curved surface portion on the surface and the portion was elliptical. In Example 4, particles having an aspect ratio within the range of the present invention and having a curved surface portion on the surface and designed to have an elliptical shape were used, but the particle material was inorganic (silica). For this reason, the difference in refractive index from the resin exceeded 0.2, and the occurrence of a slight sparkle was confirmed, but it was determined that there was no problem in practical use.
When the presence state of the particles in the concavo-convex layer was observed using an electron microscope (SEM), in Examples 1 to 4, the major axis direction of the particles was perpendicular to the thickness direction of the concavo-convex layer (that is, a film It was confirmed that the particles were present in the concavo-convex layer in an arrangement along the direction parallel to the surface.

On the other hand, in Comparative Examples 1 and 2, since the aspect ratio of the particles in the concavo-convex layer was 1.0 (less than the lower limit of the range of the present invention), although it has Newton ring prevention properties, it can suppress sparkle. There wasn't. In Comparative Example 3, since the aspect ratio of the particles in the concavo-convex layer was 3.0 (exceeding the upper limit of the range of the present invention), the sparkle could be suppressed, but the Newton ring prevention property could not be exhibited. .

[Example 5]
This example is the same as Example 1 except that the content of acrylic resin particles in coating liquid a (content in terms of weight relative to 100 parts by weight of solid content of ionizing radiation curable resin) is changed to 5.5 parts by weight. Newton ring prevention sheet was obtained. In the same manner as described above, a display with a surface member was manufactured. Next, the above evaluation was performed. As a result, in this example, particles having an aspect ratio within the scope of the present invention and including a curved surface portion on the surface and an elliptical shape of the portion were used, but the particle content tends to be too much. Therefore, the transparency was slightly deteriorated and the occurrence of sparkle was confirmed slightly, but it was judged that there was no problem in practical use.

[Example 6]
This example was the same as Example 1 except that the content of acrylic resin particles in coating solution a (content in terms of weight relative to 100 parts by weight of solid content of ionizing radiation-curable resin) was changed to 0.4 parts by weight. Newton ring prevention sheet was obtained. In the same manner as described above, a display with a surface member was manufactured. Next, the above evaluation was performed. As a result, in the present example, particles having an aspect ratio within the scope of the present invention and a curved surface portion on the surface and designed in an elliptical shape were used, but the content of the particles tended to be small. Although the sparkle could be suppressed, the occurrence of a Newton ring was confirmed slightly. However, it was judged that there was no problem with this level of occurrence.

[Example 7]
Prepare acrylic resin particles to be blended in coating solution a with an average particle size of 0.3 μm and a refractive index of 1.49 (with an aspect ratio in the range of 1.2 to 2.0). A Newton ring prevention sheet of this example was obtained in the same manner as in Example 1 except that. In the same manner as described above, a display with a surface member was manufactured. Next, the above evaluation was performed. As a result, in this example, although the aspect ratio was within the range of the present invention, since the particle diameter tended to be small, the sparkle could be suppressed, but the occurrence of Newton's ring was confirmed slightly. . However, it was judged that there was no problem with this level of occurrence.

[Example 8]
Prepare acrylic resin particles to be blended in coating solution a with an average particle diameter of 8.5 μm and a refractive index of 1.49 (however, the aspect ratio is in the range of 1.2 to 2.0). A Newton ring prevention sheet of this example was obtained in the same manner as in Example 1 except that. In the same manner as described above, a display with a surface member was manufactured. Next, the above evaluation was performed. As a result, the aspect ratio of this example was within the range of the present invention, but the particle size tended to be large, so the generation of Newton rings could be suppressed, but the occurrence of sparkle was confirmed slightly. did it. However, it was judged that there was no problem with this level of occurrence.

Claims

In the display with the surface member in which the surface member is arranged on the display at an interval, the surface member has a concavo-convex layer containing particles and a binder resin on the surface facing the display,
The particles have an anisotropy with an aspect ratio of 1.2 or more and 2.0 or less,
A display with a surface member, wherein the particles are present in the concavo-convex layer along a direction in which a major axis direction intersects a thickness direction of the concavo-convex layer.
The display according to claim 1, wherein the particle includes a curved surface portion on a surface thereof, and the curved surface portion has an elliptical shape.
3. The display with a surface member according to claim 1, wherein the content of the particles in the uneven layer is 0.5 parts by weight or more and 5.0 parts by weight or less with respect to 100 parts by weight of the binder resin.
4. The display according to claim 1, wherein the particles have an average particle diameter of 0.5 μm or more and 8.0 μm or less.
5. The display according to claim 4, wherein the uneven layer has a thickness of 0.1 μm or more and 3.0 μm or less, and 0.2 to 0.8 times the average particle diameter of the contained particles. Display with members.
The display according to any one of claims 1 to 5, wherein the difference in refractive index between the binder resin portion and the particle portion in the concavo-convex layer is 0.2 or less.
7. The display according to claim 1, wherein the surface member is a touch panel or a protective plate.
In the Newton ring prevention sheet having an uneven layer containing particles and a binder resin,
The particles have an anisotropy with an aspect ratio of 1.2 or more and 2.0 or less,
The Newton ring prevention sheet, wherein the particles are present in the concavo-convex layer along a direction in which a major axis direction intersects a thickness direction of the concavo-convex layer.
9. The Newton ring prevention sheet according to claim 8, wherein the particles include a curved surface portion on a surface thereof, and the curved surface portion has an elliptical shape.
The Newton ring prevention sheet of Claim 8 or 9 WHEREIN: Content of the particle | grains in an uneven | corrugated layer is 0.5 weight part or more and 5.0 weight part or less with respect to 100 weight part of binder resins. Sheet.
11. The Newton ring prevention sheet according to claim 8, wherein the particles have an average particle diameter of 0.5 μm or more and 8.0 μm or less.
In the Newton ring prevention sheet of Claim 11, the uneven | corrugated layer is 0.1 micrometer or more and 3.0 micrometers or less, and is 0.2 times or more and 0.8 times or less of the average particle diameter of the particle | grains contained. Newton ring prevention sheet.
The Newton ring prevention sheet according to any one of claims 8 to 12, wherein the refractive index difference between the binder resin part and the particle part in the uneven layer is within 0.2.
The Newton ring prevention sheet according to any one of claims 8 to 13, wherein the Newton ring is used in a direction in which a concavo-convex layer is disposed on a surface of the surface member disposed at an interval on the display so as to face the display. Ring prevention sheet.