JP2014137497A - Front protective plate for display device and display device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a front protective plate for a display device, in which light fastness of a light-shielding layer composed of a colored resin layer using a photosensitive resin can be improved, and to provide a display device including the front protective plate.SOLUTION: A front protective plate 10 for a display device includes a light-resistant colored resin layer 3 described below as a light-shielding layer 2 on a surface of a light-transmitting substrate 1, at a position nearest to the light-transmitting substrate among the constituent layers of the light-shielding layer 2. The light-resistant color resin layer contains a color pigment in a resin binder comprising a cured product of a photosensitive resin and has a unit OD that is an optical density per 1 μm thickness calculated from the transmittance in a visible light region, of 2.0 or less and 0.5 or more. By forming the light-resistant colored resin layer having a specified range of the unit OD of the colored resin layer, light fastness of the light-shielding layer can be improved. A normal colored resin layer having a unit OD of over 2.0 may be disposed on a back side of the light-resistant color resin layer so as to ensure the required light-shielding property by both layers. The obtained front protective plate for a display device is assembled with a display panel such as a liquid crystal display panel and an EL panel to constitute a display device.

Description

  The present invention relates to a front protective plate for a display device and a display device including the same. In particular, the present invention relates to a front protective plate for a display device having a light shielding layer with improved light resistance and a display device including the same.

  In recent years, touch panels have been rapidly spread as position input devices used in combination with display panels in various display devices such as smartphones and tablet PCs (personal computers). Various types of touch panels, such as electromagnetic induction and resistive film systems, have been known for a long time, and they have been used for various purposes. Recently, however, the capacitance method is particularly capable of multi-touch (multi-point simultaneous input). The touch panel is attracting attention.

FIG. 12 is a diagram schematically illustrating an example of a conventional display device 200 including the touch panel 20. FIG. 12A is an exploded plan view, and the cross-sectional view of FIG. 12B is the exploded plan view of FIG. It is sectional drawing of only the front protection plate 40 for display devices at the time. The touch panel 20 is disposed on the front side (the front side in the drawing) that is the light output side of the display light from the display panel 30 with respect to the display panel 30. Further, in order to protect the touch panel 20, a front protective plate for display device 40 is disposed on the front side of the touch panel 20, which is the side from which the display light from the display panel 30 passes through the touch panel 20 and emits light (Patent Literature). 1, Patent Document 2, Patent Document 3).
As shown in FIG. 12, the conventional front protective plate 40 for a display device usually has an outer peripheral portion of the display area A1 which is an opaque area A2, and the opaque layer A has a light-shielding layer 2 having translucency. It is formed on the substrate 1. This light shielding layer 2 is usually constituted by a colored resin layer 2a containing a color pigment in a resin binder. The opaque area A2 prevents the touch panel 20 disposed on the back side of the display device front protective plate 40 from seeing the wiring 7 and connectors on the outer peripheral portion so as not to impair the appearance. Further, visible information 8 such as a product logo is also provided in the opaque area A2 as appropriate, and the opaque area A2 also serves as a decoration part of the front protective plate 40 for a display device.

Each member of the front protective plate 40 for the display device, the touch panel 20 and the display panel 30 may be closely stacked by being filled with a resin layer without providing a gap between these members. By doing so, it is possible to reduce display light loss due to interface reflection and external light reflection to make the display easier to see.
Further, in order to meet the demands for thinning, lightening, and reduction in the number of parts, various integrations such as integration of the front protective plate 40 for the display device and the touch panel 20 or integration of the touch panel 20 and the display panel 30 are possible. A form has been proposed and put into practical use (Patent Document 1, Patent Document 2).

JP 2009-193587 A Utility Model Registration No. 3153971 JP 2008-266473 A ([0009], [0030], FIG. 2)

  By the way, the colored resin layer 2a constituting the light shielding layer 2 in the opaque region A2 is usually formed as a cured layer of a thermosetting resin by screen printing. However, because the pattern cannot be formed with high positional accuracy by screen printing, and because the thickness increases and the transparent electrodes and wiring for the touch panel are integrated, it is easy to break at the stepped part. It can be considered that a cured layer of the photosensitive resin is formed by a photolithography method using a photosensitive resin that can be formed. However, since the colored resin layer 2a using a photosensitive resin is formed by photopolymerizing a photopolymerizable compound, even if a post-baking process for completing the polymerization reaction after exposure is performed, the colored resin layer 2a may be deteriorated with time. It has been found that the light resistance may be insufficient due to deterioration, such as an increase in specular reflection light and a decrease in adhesion.

  Accordingly, an object of the present invention is to improve the light resistance of a colored resin layer using a photosensitive resin constituting a light shielding layer in a front protective plate for a display device. Moreover, it is providing the display apparatus provided with such a front surface protection plate for display apparatuses.

In the present invention, a front protective plate for a display device and a display device having the following configuration are provided.
(1) A front protective plate for a display device having a central display area and an opaque area that is provided on an outer periphery of the display area and shields visible light,
A light-transmitting substrate, and a light-shielding layer provided in the opaque region on one surface of the light-transmitting substrate;
Having at least
The light shielding layer includes a color pigment in a resin binder using a cured product of a photosensitive resin at a position closest to the light-transmitting substrate among the light shielding layers as a constituent layer of the light shielding layer,
The optical density is determined from the transmittance T in the visible light region having a wavelength of 380 to 780 nm.
Optical density = Log (1 / T)
When the optical density per 1 μm thickness is defined as a unit OD,
The unit OD has a light-resistant colored resin layer that is 2.0 or less and 0.5 or more
Front protective plate for display devices.
(2) On one surface of the translucent substrate and on the light-resistant colored resin layer, a resin binder using a cured product of a photosensitive resin contains a color pigment, and the unit OD exceeds 2.0. Usually having a colored resin layer as a constituent layer of the light shielding layer,
(1) The front protective plate for a display device.

(3) A touch panel provided on one surface of the translucent substrate and on the translucent substrate and the light shielding layer so as to extend from the display region to the opaque region having the light shielding layer. Transparent electrode for,
An opaque wiring provided on the light shielding layer so as to be electrically connected to the transparent electrode at a portion of the light shielding layer;
Having
The front protective plate for a display device according to (1) or (2).

(4) A display device comprising the display device front protective plate according to any one of (1) to (3) and a display panel.

According to the front protective plate for a display device of the present invention, the light resistance of the colored resin layer using the photosensitive resin constituting the light shielding layer can be improved by the light resistant colored resin layer in which the unit OD is set in a specific range. .
According to the display device of the present invention, the display device front protective plate included in the display device has the above-described effect.

The top view (a) which looked at 1st Embodiment of the front protection plate for display apparatuses by this invention from the front side, and the partial expanded sectional view which show typically (b). Sectional drawing explaining the measuring method of the optical density, and the measuring method of the regular reflectance of a light shielding layer. The graph which shows the variation | change_quantity with time of the regular reflectance of a light shielding layer. The partial expanded sectional view which shows 2nd Embodiment (The light-shielding layer of 2 layer structure of a light-resistant coloring resin layer and a normal coloring resin layer) of the front surface protection plate for display apparatuses by this invention. The top view which looked at 3rd Embodiment (integration of a touchscreen function) of the front surface protection plate for display apparatuses by this invention from the back side. The partial enlarged plan view (a) and the partial enlarged sectional view (b) which show typically the transparent electrode and wiring on the light shielding layer in 3rd Embodiment. The partial enlarged plan view (a) and partial enlarged sectional view (b) which show typically the intersection of the transparent electrode in a 3rd embodiment. The partial expanded sectional view which shows the structural example of an infrared rays transmission window thru | or a notification window as a window. The partial expanded sectional view which shows another structural example as an infrared transmissive window. 1 is a cross-sectional view schematically illustrating a first embodiment of a display device according to the present invention. Sectional drawing which illustrates 2nd Embodiment of the display apparatus by this invention typically. An exploded plan view (a) showing an example of a conventional front protective plate for a display device and a display device, and a cross-sectional view (b) of the front protective plate for a display device along line CC in the exploded plan view.

    Hereinafter, embodiments of the present invention will be described with reference to the drawings. Note that the drawings are conceptual diagrams, and the scale relations, aspect ratios, and the like of components may be exaggerated as appropriate for convenience of explanation.

[A] Definition of terms:
Hereinafter, definitions of main terms used in the present invention will be described here.

The “front side” is the side from which the display light from the display panel is emitted when the front protective plate for display device is used in combination with the display panel in the front protective plate for display device or other components. It means the side that observes the display from the panel.
The “back side” means the side opposite to the “front side”, and means the side where display light from the display panel enters in the front protective plate for display device or other components.
Originally, “one side” and “the other side” which is the opposite side are either “front side” and which side is the “front side”. In the present invention, the surface of the translucent substrate that always has the light shielding layer is referred to as “one surface”, and this one surface is used as the back surface. The “one surface” or “back side” surface is also referred to as “first surface S1”, and the “other surface” or “front side” surface is also referred to as “second surface S2.”

[B] Front protective plate for display device:
Hereinafter, a front protective plate for a display device according to the present invention will be described.

<< First Embodiment >>
A first embodiment of a front protective plate for a display device according to the present invention will be described with reference to a plan view of FIG. 1A and a partially enlarged sectional view of FIG. The cross-sectional view of FIG. 1B is a cross-sectional view taken along line CC in the plan view of FIG.

  The display device front protective plate 10 of the present embodiment shown in FIG. 1 has a central display area A1 and an opaque area A2 that is provided on the outer periphery of the display area A1 and shields visible light. The front protective plate 10 for a display device in the present embodiment is a configuration of the light-transmitting substrate 1 and the light-shielding layer 2 provided in the opaque region A2 on the first surface S1, which is one surface of the light-transmitting substrate 1. A light-resistant colored resin layer 3 is provided as a layer, and the light-resistant colored resin layer 3 causes the light shielding layer 2 to exhibit a black color such as black.

  In the present embodiment, the light shielding layer 2 is provided on the first surface S1 of the translucent substrate 1, and the second surface S2 is displayed through the display area A1 with the first surface S1 as the back side. Used toward the viewer V side of the panel.

The light-resistant colored resin layer 3 contains a color pigment in a resin binder using a cured product of a photosensitive resin. The light-resistant colored resin layer 3 is formed by applying a colored photosensitive resin composition containing a colored pigment and an uncured photosensitive resin on the light-transmitting substrate 1 and patterning it by a photolithography method.
Moreover, the light-resistant colored resin layer 3 has a unit optical density (hereinafter referred to as “unit optical density”) defined as an optical density per 1 μm thickness (hereinafter referred to as “unit optical density”) as an indicator of its light shielding property. “Unit OD”) is 2.0 or less and 0.5 or more.

  Thus, in the present embodiment, when the light shielding layer 2 is formed by the photolithography method, conventionally, the unit OD is set to a large value such as 3.0 or more, and the light shielding property as the light shielding layer 2 is ensured with a thickness of about 1 μm. However, by setting the unit OD2.0 or less to 0.5 or less and increasing the thickness accordingly, the light-resistant colored resin layer 3 alone is a layer that ensures the light-shielding property as the light-shielding layer 2. . For example, if the unit is OD1.5, the optical density OD3.0 can be secured if the thickness is 2 μm.

The light shielding layer 2 is a decorative layer for decorating the front protective plate 10 for a display device, in addition to the function of hiding the wiring 7 and the like.
In the present invention, as shown in FIG. 1A, the display device front protective plate 10 can provide visible information 8 such as a product logo in the opaque region A2.

Thus, light degradation of the light-resistant colored resin layer 3 can be suppressed by the light-resistant colored resin layer 3 having a unit OD set to be small from the conventional idea, and the light-shielding layer 2 having the light-resistant colored resin layer 3 can be suppressed. Light resistance can be improved.
In the present embodiment, the light shielding layer is composed only of the light-resistant colored resin layer 3, and the light resistance of the light-shielding layer 2 is improved by the light-resistant colored resin layer 3.

  Hereinafter, each component will be further described in detail.

[Display area A1 and opaque area A2]
As illustrated in the plan view of FIG. 1A, the display device front protective plate 10 has a display area A1 at the center, and an opaque area A2 that shields visible light from the outer periphery of the display area A1. Have The display area A1 is an area through which the display panel displays the content displayed by the display device front protective plate 10 when the display device front protective plate 10 is applied to the display panel. The opaque area A2 is an opaque area for hiding the wiring 7 and the connector, or for hiding the wiring and the connector that the display panel has on the outer periphery. Further, the opaque area A2 is an area that also becomes a decoration part by visible information 8 such as a color or pattern that it expresses, a logo or a mark provided as appropriate.

[Translucent substrate 1]
The translucent substrate 1 is not particularly limited as long as it is transparent to at least visible light and has a mechanical strength capable of protecting the surface of the display panel to which the front protective plate 10 for a display device is applied. Typically, a glass plate can be used. In particular, as the glass plate, chemically strengthened glass is preferable in that it has excellent mechanical strength compared to float glass and can be made thinner by that amount. Chemically tempered glass is typically glass whose mechanical properties have been reinforced by a chemical method by exchanging part of ionic species such as by replacing sodium with potassium in the vicinity of the surface of the glass.
Resin can also be used for the translucent substrate 1. For example, as the resin, an acrylic resin, a polycarbonate resin, a cycloolefin resin, a polyester resin, or the like can be used. By using a resin for the light-transmitting substrate 1, the weight can be reduced and flexibility can be provided.

[Light shielding layer 2]
The light shielding layer 2 imparts a light shielding property to visible light to the opaque region A2. The light shielding layer 2 has a function of improving the appearance design as well as a light shielding property for hiding unnecessary parts. That is, the light shielding layer 2 also has a function as a decorative layer that represents an arbitrary design.

  The light shielding layer 2 has a light-resistant colored resin layer 3 as one constituent layer. And the light resistance coloring resin layer 3 is improving the light resistance with respect to light by setting unit OD to a specific range. As a result, the light resistance of the light shielding layer 2 is improved.

  The light-shielding property of the light-shielding layer 2 depends on the required specifications and expression color, but in terms of transmittance, it is 3% or less (1.5 or more at the optical density OD), more preferably 1% or less. (Optical density OD2.0 or higher), more preferably 0.01% or lower (optical density OD4.0 or higher) in transmittance is desirable. This is because if the light shielding property of the light shielding layer 2 is insufficient, the wirings 7 and components to be hidden by the light shielding layer 2 may be visually recognized through the light shielding layer 2 and the appearance may be impaired.

[Light Resistant Colored Resin Layer 3]
The light-resistant colored resin layer 3 is formed as a layer containing a color pigment in a resin binder using a cured product of a photosensitive resin, and its transmittance is a unit OD (Optical Density) per 1 μm thickness in this embodiment. Is 2.0 or less and 1.0 or more. In the present invention, the lower limit of the unit OD is not 1.0 but 0.5.

(Unit optical density: Unit OD)
In the present invention, the unit optical density, for example, the simple substance OD is 2.0 or less and 0.5 or more, but the lower limit of the unit OD is not 0.0 (zero). The unit OD of zero means that the unit OD in the present invention is a characteristic value based on the transmittance, and thus means not completely white but completely transparent with a transmittance of 100%. However, when the unit OD is zero, the light shielding layer 2 cannot be a layer having a light shielding property as a constituent layer.
For this reason, in this invention, the minimum of unit OD of the light-resistant coloring resin layer 3 is 0.5 or more, Preferably it is 1.0 or more. This is because, by setting the lower limit of the unit OD to be equal to or more than the above value, the light-resistant colored resin layer 3 can exhibit the function of providing the light shielding properties required for the light shielding layer 2.

  In the present invention, for the unit OD (unit optical density) which is an optical density captured by transmitted light per 1 μm thickness, the optical density captured by transmitted light at the entire thickness of the layer of interest is simply “optical”. It will be called “density” or “optical density OD”.

In FIG. 2, [A] is a diagram for explaining the measurement of the optical density. The optical density is measured by reflected light if the appearance of the light shielding layer 2 is evaluated. Since it is measured as an indicator of the light shielding property, it is measured with transmitted light.
The unit OD is the optical density based on the transmittance T in the visible light region with a wavelength of 380 to 780 nm.
When optical density = Log (1 / T),
It is defined as the optical density per 1 μm thickness.
The measurement of the transmittance T is the same as the measurement of the regular reflectance described later, and the light from the standard light source C by the International Illumination Committee CIE is perpendicular to the front side of the translucent substrate 1 on which the light-resistant colored resin layer 3 is formed. The value obtained by dividing the Y value [%] in the Yxy color system by 100 for the transmitted light transmitted to the back side is defined as the transmittance of the transmitted light. For the measurement, only the translucent substrate 1 is measured as a reference value, and the transmittance T of only the light-resistant colored resin layer 3 is calculated.
In the present embodiment, the unit OD and the optical density were measured with a microspectrophotometer (manufactured by Olympus Corporation, OSP-SP200).

(Color pigment)
As the coloring pigment, a known pigment corresponding to the color expressed by the light-resistant colored resin layer 3 and the light shielding layer 2 can be used, and there is no particular limitation. For example, as the colored pigment, a black pigment, a red pigment, a yellow pigment, a blue pigment, a green pigment, a purple pigment, a white pigment, and the like can be used. The color pigments may be used alone, or a plurality of color pigments of the same type or different colors may be used.
For example, carbon black and titanium black (low-order titanium oxide, titanium oxynitride, etc.) can be used for the black pigment. As the coloring pigment, although depending on the color to be expressed, a black pigment is preferable in terms of easily obtaining light shielding properties. A black color such as black can be expressed by mixing a plurality of chromatic color pigments without using a black pigment such as carbon black.

(Photosensitive resin)
Examples of the photosensitive resin include photosensitive resins having a photoreactive group such as an acrylic resin, an epoxy resin, a polyimide resin, a polyvinyl cinnamate resin, and a cyclized rubber. One or more can be used. In the acrylic resin, for example, a photosensitive resin composed of an alkali-soluble resin, a polyfunctional acrylate monomer, a photopolymerization initiator, and other additives can be used as a resin component of the resin binder.

As the alkali-soluble resin, one or more kinds of methacrylic acid ester copolymers such as benzyl methacrylate-methacrylic acid copolymer, cardo resins such as epoxy acrylate having a bisphenol fluorene structure, and the like can be used.
Examples of the polyfunctional acrylate monomers include trimethylolpropane tri (meth) acrylate, pentaerythritol tetra (meth) acrylate, dipentaerythritol penta (meth) acrylate, dipentaerythritol hexa (meth) acrylate, and the like. The above can be used.
In the present invention, (meth) acrylate means either methacrylate or acrylate.

  As the photopolymerization initiator, one or more known ones such as alkylphenone, oxime ester, triazine, and titanate can be used. For example, in the alkylphenone series, 2-methyl-1 [4- (methylthio) phenyl] -2-morpholinopropan-1-one (Irgacure (registered trademark) 907, manufactured by BASF Japan Ltd.), 2-benzyl- In 2-dimethylamino-1- (4-monofoliophenyl) butanone-1 (Irgacure (registered trademark) 369, manufactured by BASF Japan Ltd.), an oxime ester system, 1,2-octanedione, 1- [4- ( Phenylthio) phenyl]-, 2- (O-benzoyloxime) (Irgacure (registered trademark) OXE01, manufactured by BASF Japan Ltd.) and the like can be used.

  In addition to the above, the resin binder of the light-resistant colored resin layer 3 may include various known additives such as a photosensitizer, a dispersant, a surfactant, a stabilizer, and a leveling agent.

  As described above, the light-resistant colored resin layer 3 contains a color pigment in a resin binder using a cured product of a photosensitive resin. In the present invention, the cured product of the photosensitive resin that constitutes the resin binder Is not limited to a cured product of only a photopolymerizable compound, for example, the above-mentioned dispersant, surfactant, or non-photopolymerizable polymer that can be used as the alkali-soluble resin blended for alkali development suitability It is a cured product that can usually contain other non-photopolymerizable compounds.

(Expression color by light-resistant colored resin layer 3)
The expression color by the light-resistant colored resin layer 3 is typically black, but is particularly limited as long as the unit OD is 2.0 or less and the unit OD is 0.5 or more, preferably 1.0 or more. There is no.
When the unit OD is 0.5 or more, preferably 1.0 or more, the colors that can be expressed by the light-resistant colored resin layer 3 include light in a part of the wavelength range of 380 to 780 nm of visible light. It is difficult to express a chromatic color obtained by an absorption spectrum having a small absorption, particularly a bright chromatic color. As a result, the color of the light-resistant colored resin layer 3 is inevitably a black color.
Specifically, the black color is, for example, a bluish black, a greenish black, a reddish black, a brownish black, an orangeish black, or a white other than a black with no color It may be a blackish color.

In this way, the black color is not only pure black (pure black) but also transparent black, reddish black, yellowish black, blued black, greenish black, purple black, brown Mino black, white black (dark gray), very dark red, very dark yellow, very dark blue, very dark green, very dark purple, very dark brown, etc. , Including.
If these black colors are numerically shown, they can be defined using various color systems. In particular, as shown by the Munsell color system (JIS Z 8721), which is one of the conventional color systems, in the present invention, the black color is the lightness in the Munsell color system, although it depends on the hue. It can be defined as a color of 3.0 or less. As for the hue of the black color, any color may be used. The saturation may be arbitrary. This is because when the lightness is 3.0 or less, the difference in color due to saturation is felt to be small.

In the Munsell color system, all colors are represented by three attributes of brightness, saturation, and hue. In the Munsell color system, this brightness is 10 for the brightest ideal white and 0 for the darkest ideal black. In the present invention, the black color can be set to 3 and 3.0 or less even if the brightness is large. In the Munsell color system, the saturation is 0 for an achromatic color, the value increases as the color becomes darker, and the maximum value varies with lightness and hue but is 14 at maximum. For black color, the saturation may be arbitrary as described above.
The three attributes of the Munsell color system can be measured with a commercially available spectrophotometer, spectrophotometer, or the like.
Among black colors, particularly blackish colors are colors of 2.0 or less in brightness when expressed by the Munsell color system, and blackish colors are colors with a brightness of 1.5 or less.

(Formation of light-resistant colored resin layer 3)
In the present invention, the method for forming the light-resistant colored resin layer 3 is basically not particularly limited. For example, the light-resistant colored resin layer 3 can be formed by a colored photosensitive resin composition containing a color pigment in a resin binder containing an uncured product of the photosensitive resin. The light-resistant colored resin layer 3 is preferably formed by a photolithography method. This is because, compared with the case of forming by screen printing, the pattern can be accurately thinned and the thickness can be stably reduced, and disconnection of the step portion can be made difficult to occur. In the photolithographic method, a colored photosensitive resin composition is applied on the surface of the light-transmitting substrate 1, and then exposed to a predetermined pattern, developed, and subjected to a predetermined process such as baking, thereby obtaining a light-resistant colored resin. Layer 3 can be formed. In the present embodiment, the light-resistant colored resin layer 3 is formed by a photolithography method.

The colored photosensitive resin composition further contains a solvent for adjusting the coating suitability when the resin composition is applied onto the surface of the light-transmitting substrate 1 or the printing suitability when printing. be able to.
As the solvent, for example, one or more of propylene glycol monomethyl ether, propylene glycol monomethyl ether acetate, ethyl cellosolve, 3-methoxybutyl acetate, and the like can be used.

  As the color pigment and the uncured product of the photosensitive resin, a color resist material that has been conventionally adjusted for color filter use may be used.

  The method of applying the colored photosensitive resin composition on the surface of the translucent substrate 1 is, for example, by a known coating method such as spin coating, roll coating, die coating, spray coating, or bead coating. Can do.

  The light-resistant colored resin layer 3 is formed as an insulating layer in the present embodiment. For this reason, the transparent electrode 5 and the wiring 7 can be formed directly on the surface of the light-resistant colored resin layer 3 without interposing the insulating layer 6 on the light-resistant colored resin layer 3.

[Mechanism for improving light resistance by the light-resistant colored resin layer 3]
The present inventors have found that when the unit OD is deliberately reduced in order to improve the light resistance of the colored resin layer used for the light shielding layer 2, the light resistance of the colored resin layer is improved. Therefore, such a colored resin layer having a unit OD of a specific value or less is referred to as a light-resistant colored resin layer 3.
However, it is currently unknown why the light resistance is improved only by reducing the unit OD. Originally, in terms of the light shielding properties required for the light shielding layer 2, the unit OD of the colored resin layer can be made thinner as the unit OD is increased. is there.
Surprisingly, however, the present inventors have found that the light resistance of the colored resin layer having a smaller unit OD is improved as compared with the prior art, and arrived at the present invention.

(Light resistance index)
In the present embodiment, the degree of increase in the regular reflectance of the color expressed by the light-resistant colored resin layer 3 with time is adopted as the light resistance index of the light-resistant colored resin layer 3.
In the present invention, the light resistance index is basically not particularly limited as long as the performance of the light-resistant colored resin layer 3 deteriorates due to sunlight. For example, a spectrum change of diffuse reflected light can be employed.

(Regular reflectance)
Specifically, the increase in regular reflectance over time was measured and evaluated as follows.
Using the front protective plate 10 for a display device as a test piece, an accelerated test was carried out by a light resistance tester, and the time-dependent transition of the regular reflectance from the front side of the portion of the light-resistant colored resin layer 3 was measured. It was judged that the light resistance was improved by the fact that the increase was small.
As the light resistance tester, for example, a xenon long life fade meter FAL-25AX (manufactured by Suga Test Machine Co., Ltd.) can be used.
The transition of the regular reflectance is obtained by measuring the intensity of regular reflection light. For the measurement of the intensity of regular reflection light, for example, a microspectrophotometer OSP-SP200 (manufactured by Olympus Corporation) can be used.

In FIG. 2, [B] is a diagram showing a method for measuring regular reflectance. As shown in the figure, the specular reflectance is a specular reflection of the specularly reflected light with the Y value [%] in the Yxy color system by applying the light of the standard light source C by the International Commission on Illumination CIE vertically from the front side. The rate [%]. The measurement is performed by focusing the microscopic spectrophotometer on the interface between the translucent substrate 1 and the light-resistant colored resin layer 3.
Further, as the change in regular reflectance, the change is calculated as the difference in regular reflectance after the start of the test with respect to the regular reflectance in the initial state before the light resistance promotion test is started.

  The test time in the light resistance tester is usually 50 h or more, preferably 100 h or more, more preferably 500 h or more, and further preferably 1000 h or more. It can be said that the light resistance is improved if the change in the light resistance index is small within this time. Furthermore, if the change is within an allowable range, it can be said that the light resistance has been improved practically.

The amount of change over time of the regular reflectance in this embodiment is shown in the graph of FIG. The test conditions of the weathering tester at this time are an integrated illuminance of 320 W / m ^{2 at} 300 to 700 nm and a test piece temperature of 60 ° C.

Table 1 shows the regular reflectance before the weather resistance test is input in each unit OD shown in the graph of FIG. As for the numerical values in Table 1, a colored resin layer having a unit OD of 2.0 or less corresponds to the light-resistant colored resin layer 3, and a colored resin layer having a unit OD exceeding 2.0 corresponds to the colored resin layer 4.
In Table 1, the pigment concentration (%) of the color pigment corresponding to each unit OD means the color pigment based on the total solid content including the resin binder and the color pigment in the color resin layer, specifically, the mass% of carbon black. To do.

From the graph shown in FIG. 3, it can be seen that the amount of change in the regular reflectance is reduced and the light resistance is improved by the light-resistant colored resin layer 3 having a unit OD of 2.0 or less.
When the change amount of the regular reflectance is 0.15 or more, the change can be visually determined. Therefore, although it depends on the required level, the change amount of the regular reflectance is preferably less than 0.15.
In this embodiment, when the unit OD is 2.0, the test time by the light resistance tester is at least 50 h, the change in regular reflectance is less than 0.15, and the light resistance is improved at least until the test time is 50 h. You can see that Furthermore, when the unit OD is 1.5 and 1.0, the test time by the light resistance tester is at least 100 h, the change in regular reflectance is less than 0.15, and the light resistance is improved at least until the test time is 100 h. You can see that

(Preferred pigment concentration)
Table 1 shows data in a colored resin layer that exhibits a black color using only carbon black as a black pigment, and Table 1 shows the pigment concentration of the colored pigment at that time.
In this embodiment, if the pigment concentration of the colored pigment is not the unit OD that provides light resistance, but the pigment concentration is 27% (unit OD2.0), the test time by the light resistance tester is at least 50 h. Thus, it can be seen that the change in regular reflectance is less than 0.15, and the light resistance is improved at least until the test time of 50 h. Further, pigments having a pigment concentration of 20% (unit OD1.5) and 13% (unit OD1.0) have a test time of at least 100 h using a light resistance tester, and the change in regular reflectance is less than 0.15. It can be seen that the light resistance is improved at least until a test time of 100 h.

Therefore, it can be seen from the graphs in Table 1 and FIG. 3 that the light-resistant colored resin layer 3 preferably has a pigment concentration of 30% or less in order to satisfy the change amount of regular reflectance of less than 1.5. .
However, as described above, for the same reason that the lower limit of the unit OD is preferably 0.5 instead of zero, the lower limit of the pigment concentration of the colored pigment is 6% (corresponding to the unit OD 0.5). Is preferred. Accordingly, the light-resistant colored resin layer 3 preferably has a pigment concentration of 30% or less and 6% or more.

<< 2nd Embodiment: Normal coloring resin layer 4 as a backing layer >>
This embodiment is an example in which an ordinary normal colored resin layer 4 is also provided as a backing layer on the back side of the light-resistant colored resin layer 3.
FIG. 4 is a sectional view showing a second embodiment of the front protective plate 10 for a display device according to the present invention. As shown in the figure, the front protective plate 10 for a display device of the present embodiment is a normal colored resin layer having a unit OD exceeding 2.0 on the light-resistant colored resin layer 3 with respect to the configuration shown in FIG. 4.

This embodiment is the same as the first embodiment shown in FIG. 1 except for the following points. Therefore, the description of the same part is omitted.
a) A normal colored resin layer 4 having a unit OD exceeding 2.0 is formed as a backing layer of the light-resistant colored resin layer 3 on the light-resistant colored resin layer 3 on the first surface S1.

[Normally colored resin layer 4]
Usually, the colored resin layer 4 is a colored resin layer that has been conventionally used. In the present invention, the colored resin layer that does not correspond to the light-resistant colored resin layer 3 is explicitly distinguished from the light-resistant colored resin layer 3 in the meaning of “normal” at the beginning of the term. Let's call it 4.
The position of the colored resin layer 4 in the thickness direction is, of course, a position where the distance from the translucent substrate 1 is farther than the light-resistant colored resin layer 3. For this reason, the normal colored resin layer 4 can also be said to be a backing layer for the light-resistant colored resin layer 3.

  Normally, the colored resin layer 4 is formed as an insulating layer in the present embodiment. For this reason, the transparent electrode 5 and the wiring 7 can be directly formed on the normal colored resin layer 4 without contacting the surface of the normal colored resin layer 4 via the insulating layer 6.

Usually, the colored resin layer 4 is a constituent layer of the light shielding layer 2. Depending on the thickness of the normal colored resin layer 4, the light-resistant colored resin layer that is farther from the light-transmissive substrate 1 than the light-resistant colored resin layer 3 with respect to the light-resistant colored resin layer 3, which may have insufficient light shielding properties. 3 is a layer that supplements light shielding properties. For this reason, the normally colored resin layer 4 is a layer having a unit OD larger than the light-resistant colored resin layer 3.
Specifically, the colored resin layer 4 is a layer having a unit OD exceeding 2.0. In terms of the pigment concentration, the layer has a pigment concentration of 30% or more.
Except for the above points, the normal colored resin layer 4 is the same as the light-resistant colored resin layer 3. That is, the normal colored resin layer 4 is a layer containing a colored pigment in a resin binder using a cured product of a photosensitive resin. Therefore, since the material which comprises the light-resistant coloring resin layer 3 can be used for the material which comprises the colored resin layer 4 normally, description regarding these materials is abbreviate | omitted.

The optical density at a certain thickness is a value obtained by multiplying the unit OD by the thickness (μm), and the optical density when the unit OD is a and the thickness is X μm is aX.
When layer A having a certain optical density a and layer B having a certain optical density b are overlapped, the optical density c is a + b.
Therefore, for example, the light-resistant colored resin layer 3 having a unit OD of 1.0 is formed with a thickness of 0.5 μm, and the normal colored resin layer 4 having a unit OD of 4.0 is formed with a thickness of 0.75 μm. In the light shielding layer 2 of .25 μm, 1.0 × 0.5 + 4.0 × 0.75 = 0.5 + 3.0 = 3.5, and an optical density of 3.5 can be ensured.

With such a configuration, if only the normal colored resin layer 4 is used, the light resistant colored resin is closer to the translucent substrate 1 than the normal colored resin layer 4 when the light resistance is insufficient depending on the thickness. By providing the layer 3, the light resistance of the light shielding layer 2 as a whole including the normal colored resin layer 4 and the light-resistant colored resin layer 3 can be improved.
Even if the normal colored resin layer 4 alone is inferior in light resistance to the light resistant colored resin layer 3, the normal colored resin layer 3 is present on the front side of the normally colored resin layer 4 on the transparent substrate 1 side. The light reaching the layer 4 is light after passing through the light-resistant colored resin layer 3 and attenuated. For example, if the light-resistant colored resin layer 3 has a unit OD of 1.0 and a thickness of 1 μm, the light is attenuated to 1/10. For this reason, if it says by simple calculation, the light resistance of the colored resin layer 4 will be raised 10 times normally.
Moreover, when the light-shielding property is insufficient with only the light-resistant colored resin layer 3, this can be supplemented with the normal colored resin layer 4 so that the light-shielding property of the entire light-shielding layer 2 is sufficient. In addition, in order to obtain the light-shielding property of the entire light-shielding layer 2 with only the light-resistant colored resin layer 3, the thickness is increased, but the thickness of each of the light-resistant colored resin layer 3 and the normal colored resin layer 4 is reduced to a certain extent. Without increasing the thickness, it is possible to ensure the light shielding property of the entire light shielding layer 2.

[Effect in this embodiment]
In the present embodiment, the light resistance of the light shielding layer 2 can be improved by the light resistance colored resin layer 3.
Furthermore, the normal colored resin layer 4 superimposed on the back side of the light-resistant colored resin layer 3 as the backing layer of the light-resistant colored resin layer 3 provides the light-shielding property of the entire light-shielding layer 2, and the light-resistant colored resin layer 3 alone provides the light-shielding layer 2. Compared with the case where it comprises, it can ensure by thinner thickness. Moreover, the light resistance of the normal colored resin layer 4 can also be enhanced by the light resistant colored resin layer 3.

<< Third Embodiment: Integration of Touch Panel Function >>
This embodiment is a form example which also has the transparent electrode 5 and wiring 7 for touch panels.
With reference to the plan view seen from the back side of FIG. 5, the schematic partially enlarged plan view and the partially enlarged sectional view of FIGS. 6 and 7, a third embodiment of the front protective plate 10 for a display device according to the present invention is shown. Will be explained.
FIG. 5A is an overall view of the front protective plate 10 for a display device as viewed from the back side. The partial enlarged plan views of FIGS. 5B and 5C are diagrams schematically showing the electrode pattern shapes of the first electrode 5a and the second electrode 5b constituting the transparent electrode 5. FIG. The transparent electrode 5 is an example formed for a projected capacitive touch panel.

This embodiment is the same as the first embodiment shown in FIG. 1 except for the following points. Therefore, the description of the same part is omitted.
a) The touch panel transparent electrode 5 and the wiring 7 are formed on the surface of the first surface S1.
b) An insulating layer 6 that insulates the first electrode 5a extending in the X direction and the second electrode 5b extending in the Y direction of the transparent electrode 5 from each other is formed.

[Laminated structure]
In the present embodiment, a touch panel structure in which the first electrode 5a and the second electrode 5b are formed on the same surface as the transparent electrode 5 for detecting the position of the touch panel is employed. That is, the first electrode 5a and the second electrode 5b are formed on the surface of the first surface S1, which is the same surface of the translucent substrate 1.

In the present embodiment, the transparent electrode 5 includes a first electrode 5a and a second electrode 5b that are formed to be insulated from each other.
The first electrode 5a and the second electrode 5b are made of the same material in this embodiment. Therefore, in the present specification, when these are collectively referred to, they are also simply referred to as “transparent electrode 5”.

In general, in a projected capacitive touch panel, as shown in FIGS. 5A to 5C, a plurality of first electrodes 5 a extending in the X direction, which is the left-right direction in the drawing, A plurality of second electrodes 5b which are orthogonal to each other and extend in the Y direction which is the vertical direction in the drawing. Here, the electrode extending in the X direction is referred to as a first electrode 5a, and the electrode extending in the Y direction is referred to as a second electrode 5b.
As the capacitive touch panel itself, the first electrode 5a and the second electrode 5b may be formed on different translucent substrates 1, but the same substrate or the same surface of the same substrate. By having the form formed in the above, there is an advantage that the relative positional accuracy of each other can be improved.
The front protective plate 10 for a display device according to this embodiment is also a form in which the first electrode 5a and the second electrode 5b are formed on the same surface of one translucent substrate 1.

As the pattern of the first electrode 5a and the second electrode 5b, various patterns are known in the projection capacitive method, but in the pattern in the present embodiment, one first electrode 5a is formed as shown in FIG. As shown in FIG. 5, a plurality of rhombus-shaped first transparent electrode elements 5aE and first transparent electrode elements 5aE adjacent to each other and having a smaller area than the first transparent electrode elements 5aE, An unillustrated extraction portion that extends to the opaque region A2 on the outer periphery of the position detection region and electrically connects the first transparent electrode element 5aE to the wiring 7 is configured.
Similarly, as shown in FIG. 5 (c), one second electrode 5b also connects a plurality of rhombus-shaped second transparent electrode elements 5bE and the second transparent electrode elements 5bE adjacent to each other to form a second transparent electrode. The second connecting portion 5bC has a smaller area than the electrode element 5bE, and a take-out portion (not shown) that electrically connects the second transparent electrode element 5bE to the wiring 7.
However, in FIG. 5A, only the first transparent electrode element 5aE is drawn for the first electrode 5a, and only the second transparent electrode element 5bE is drawn for the second electrode 5b. The illustration of the two connection parts 5bC and the take-out part is omitted.

  As shown in FIG. 6, the transparent electrode 5 is provided so as to extend from the display area A <b> 1 to the opaque area A <b> 2 having the light shielding layer 2, and the transparent electrode 5 is electrically connected to the wiring 7 formed on the light shielding layer 2. Connected. FIG. 6B is a partial enlarged cross-sectional view taken along the line CC in the partial enlarged plan view of FIG.

As shown in FIG. 7, the intersecting portion 5C of the transparent electrode 5 has a first connecting portion 5a and a second connecting portion 5b that are insulated from each other by the first connecting portion 5aC and the second connecting portion 5bC. The insulating layers 6 are insulated and overlapped with each other via the insulating layer 6, and together with the insulating layer 6, an intersection 5 </ b> C is configured. FIG. 7B is a partially enlarged sectional view taken along line CC in the partially enlarged plan view of FIG.
The first electrode 5a and the second electrode 5b whose extending directions intersect with each other need to be formed to be electrically insulated from each other, so that the same surface of the translucent substrate 1 (the first surface S1 in FIG. In the configuration in which these are formed on the surface), after forming either one of the first electrode 5a and the second electrode 5b, for example, the first electrode 5a, a transparent insulating layer 6 is formed on the entire surface. The second electrode 5b can also be formed on the surface of the layer 6. However, in this case, the pattern formation of the first electrode 5a and the second electrode 5b is a separate process, and the alignment accuracy is related, so the relative positional accuracy of each other does not improve. Therefore, in the configuration shown in the figure, the first electrode 5a and the second electrode 5b excluding the first connection portion 5aC are simultaneously formed on the same surface.

[Transparent electrode 5]
In the present embodiment, the transparent electrode 5 is a transparent conductor thin film whose layer itself is transparent.
Examples of the transparent electrode 5 made of a transparent conductive thin film include ITO (Indium Tin Oxide), IZO (registered trademark; Idemitsu Kosan Co., Ltd.) (Indium Zinc Oxide), AZO (Aluminum Zinc). Oxide (aluminum zinc oxide), IGZO (registered trademark; Sharp Corporation) (Indium Gallium Zinc Oxide, indium gallium zinc oxide), or the like can be used that is formed by patterning.
In the present embodiment, specifically, ITO is used as the transparent conductor thin film.

[Insulating layer 6]
For the insulating layer 6, for example, a curable resin such as an epoxy resin, an acrylic resin, or a polyimide resin can be used. As the curable resin, for example, a thermosetting epoxy resin, a photocurable acrylic photosensitive resin, or the like can be used. The insulating layer 6 can be formed by the same coating method as the light-resistant colored resin layer 3. In the case of a photosensitive resin, a photolithography method can be used when partially forming.
The insulating layer 6 can be made of an inorganic material such as silicon oxide, aluminum oxide, silicon oxynitride, or silicon nitride.

In this embodiment, the insulating layer 6 is formed as a transparent resin layer, and this transparent resin layer is made of the light-resistant colored resin layer 3 by a transparent resin composition excluding the color pigment contained in the light-resistant colored resin layer 3. It is formed similarly.
When the insulating layer 6 is transparent, the insulating layer 6 can also be formed on the entire surface of the display device front protective plate 10 including the display region A1.

[Wiring 7]
A known material and formation method can be used for the wiring 7. For example, the wiring 7 can be made of metal (including alloys thereof) such as silver, gold, copper, chromium, platinum, aluminum, palladium, and molybdenum. For example, the wiring 7 can be formed as a metal layer of a silver alloy (also referred to as APC) made of silver, palladium, and copper by sputtering, and then patterned by photolithography.
For the wiring 7, molybdenum (Mo) / aluminum (Al) / molybdenum (Mo) and a three-layered conductive layer (called MAM) can be used.
In the present embodiment, the wiring 7 is formed as a conductive metal layer from a silver alloy (also referred to as APC) made of silver, palladium, and copper.
There is no restriction | limiting in particular as a formation method of the wiring 7, You may form by printing methods, such as a screen printing method and an inkjet printing method, besides the photolithography method.

  For the wiring 7, a material and a method that do not require pattern formation by a photolithography method may be employed. For example, the wiring 7 can be formed by pattern-printing a conductive ink containing metal particles such as silver, gold, copper, and aluminum and a resin binder by a printing method such as inkjet printing.

[Integration with touch panel function]
As in this embodiment, the front protective plate 10 for a display device with wiring may be provided with a transparent electrode 5 for a touch panel, and the translucent substrate 1 may also be used as a touch panel substrate. Integration with the touch panel function can be achieved by reducing the number of parts and reducing the thickness according to that part of the form that integrates some of the functions required as a touch panel. It is more preferable to integrate them.

In the present invention, the front protective plate 10 for a display device with wiring that integrates all the functions necessary as a touch panel can be said to be a touch panel. The front protective plate 10 for a display device with wiring in which a part of functions necessary as a touch panel is integrated can be said to be a touch panel member. In this respect, when the wiring 7 is for a touch panel, the front protective plate 10 for a display device with wiring can be said to be a touch panel member.
When a part of the touch panel function is integrated, for example, in a system that requires the position detection transparent electrode 5 as the touch panel function, the transparent electrode 5 can be integrated. Various types of touch panel position detection methods are conventionally known. In the position detection method in which the transparent electrode 5 has two layers, it is desirable to integrate at least one of these layers, more preferably two layers.
In the present embodiment, the transparent electrode 5 is formed by integrating two layers.

[Effect in this embodiment]
In the present embodiment, the light resistance of the light shielding layer 2 can be improved by the light resistance colored resin layer 3.
Furthermore, it also has a touch panel function, which can contribute to reducing the number of parts and reducing the weight.

<Deformation>
The front protective plate 10 for a display device of the present invention can take other forms other than the above-described forms. Some of these will be described below.

[Light-resistant colored resin layer 3 having a multilayer structure]
In the above-described embodiments, the light-resistant colored resin layer 3 has been described as being formed as a so-called “solid layer” having a constant thickness over the entire opaque region A2. However, the light-resistant colored resin layer 3 may have a single layer structure or a multilayer structure of two or more layers.
This is because the light-resistant colored resin layer 3 can solve the shortage of light-shielding property by forming a thicker thickness when the light-shielding property is insufficient with the conventional thickness in terms of unit OD.
When the thickness of the light-resistant colored resin layer 3 is increased, the thickness may be increased by a single layer, but the thickness may be increased by stacking two or more layers to form a multilayer structure. The multilayer structure is suitable for the case of forming using a photolithography method, for example.
Each layer of the light-resistant colored resin layer 3 having a multilayer structure may be the same color or a different color layer.
Each layer of the light-resistant colored resin layer 3 having a multilayer structure may have the same thickness or different thicknesses.
Each layer of the light-resistant colored resin layer 3 having a multilayer structure may be the same or different.
A pattern in which the light-resistant colored resin layer 3 is formed in a pattern in the opaque region A2 may be expressed.

[Transparent electrode including mesh electrode 5]
In the present invention, as the transparent electrode 5, a pseudo-transparent mesh electrode is formed by forming a conductive layer having an opaque layer itself as a fine line of 50 μm or less, more preferably 30 μm or less. It can also be used. As such a conductor layer, the materials described in the wiring 7 can be used. In this case, the transparent electrode 5 can be formed of the same material as the wiring 7 and can be formed simultaneously. In the mesh electrode, a thin portion such as an extraction portion, which originally has a line width of 30 μm or less, may not be formed in a mesh shape.

[Visible information 8]
In the present invention, a product logo mark or the like is formed as visible information 8 in the opaque region A2 where the light shielding layer 2 is formed, like the display device front protective plate 10 illustrated in the plan views of FIGS. May be. The visible information 8 is any visually observable information such as a product logo, an operation explanation character, symbol, or pattern in the opaque area A2.
The visible information 8 is provided, for example, on the back side of the light shielding layer 2 as a non-forming part of the light shielding layer 2 by a layer having a different appearance and color from the light shielding layer 2 so that it can be seen from the front side of the light transmissive substrate 1. Examples of the layer having a different appearance and color from the light shielding layer 2 include a colored resin layer and a metal layer.

[Window 9]
As shown in the plan view of FIG. 5 and the partially enlarged sectional view of FIG. 8, in the present invention, the front protective plate 10 for a display device may have a window 9 in the opaque region A2. The window 9 is, for example, infrared transmission or a notification window. The window 9 is not a portion where the translucent substrate 1 is missing at the portion of the window 9, but is a portion where the transmittance of the light shielding layer 2 is different from the portion other than the window 9. is there. If this transmittance is a transmittance for infrared light, it becomes an infrared transmission window 9, and if it is a transmittance for visible light, it becomes a notification window 9.

In the present invention, as shown in FIGS. 5 and 8, the infrared transmission window 9 and the notification window 9 are represented by the same reference numeral “9” because of common reference to the drawings.
By providing the infrared transmission window 9, it can be adapted to an infrared sensor.
By providing the notification window 9, various information can be notified.
As the window 9, only the infrared transmission window 9 may be provided, or only the notification window 9 may be provided, and the infrared transmission window 9 and the notification window 9 are separately provided at different positions. May be.

[Infrared transmission window 9]
The infrared transmission window 9 is used for preventing the malfunction of the touch panel when the mobile phone is put on the ear during a call, and from the viewpoint of extending the battery life by turning off the display on the display panel. It is provided in the part of the infrared sensor provided as a human sensor that senses the approach of.
The infrared transmission window 9 is provided as a non-formation part of the light shielding layer 2 in the opaque region A2, and is formed as a part that exhibits a light shielding property with respect to visible light and a light transmittance with respect to infrared light. . The optical performance of the infrared transmission window 9 can be realized by forming an infrared transmission layer 9ir having the optical performance in the infrared transmission window 9 portion. The infrared transmission layer 9ir is used when the light-resistant colored resin layer 3 of the light-shielding layer 2 is black, for example, when carbon black is used as a black pigment, it becomes light-shielding not only for visible light but also for infrared light. For this reason, the infrared transmission layer 9ir may be required as a layer made of a material different from that of the light-resistant colored resin layer 3.

The transmittance of the infrared transmission window 9 with respect to infrared light depends on required specifications, expression color, and infrared components such as an infrared sensor applied to the infrared transmission window 9. The transmittance is 70% or more. The infrared region having a transmittance of 70% or more is not necessarily a region of 780 nm or more. For example, an infrared region of 850 nm or more can be sufficiently handled. Note that the upper limit of the infrared region where the transmittance is 70% or more can be dealt with if the near-infrared region is satisfied, usually up to 1300 nm.
The light shielding property of the infrared transmission window 9 with respect to visible light depends on the required specifications and the expression color. However, since the infrared transmission window 9 is usually small in spot, the light shielding property level of the light shielding layer 2 is not necessarily limited. There is no need to match. For this reason, the light shielding property with respect to the visible light of the infrared transmission window 9 is 50% or less (0.2 or more at the optical density OD), more preferably, in terms of transmittance. It is desirably 25% or less (optical density OD 0.6 or more), more preferably 10% or less (optical density OD 1.0 or more) in terms of transmittance.
Thus, for example, the infrared transmission window 9 is provided at a wavelength of 850 nm to 1300 nm for the infrared light region and 70% or more for the visible light region, and 10% or less for the visible light region. The transmittance is not an average value but a value for each wavelength.

(Infrared transmission layer 9ir)
The infrared transmission layer 9ir is a constituent layer of the light shielding layer 2 together with the light-resistant colored resin layer 3 because it has a light shielding property against visible light.
The infrared transmission layer 9ir is usually formed in a similar color to the light-resistant colored resin layer 3 in order to make the presence of the infrared transmission window 9 inconspicuous. The infrared transmission layer 9ir exhibits a light shielding property with respect to visible light and a transparency with respect to infrared light.
In order to express a black color in the infrared transmitting layer 9ir, a plurality of types of chromatic coloring pigments having different colors other than the black pigment, such as red, It can be expressed by containing yellow and blue. As the chromatic color pigments such as red, yellow, and blue, usual conventionally known pigments can be used.

  The relationship between the infrared transmission layer 9ir and the light-resistant colored resin layer 3 is such that the infrared transmission layer 9ir is formed on the transparent substrate 1 before the light-resistant colored resin layer 3, and the infrared transmission is applied to the transparent substrate 1. There is a configuration in which the layer 9ir is formed after the light-resistant colored resin layer 3.

FIG. 9 is a partial enlarged cross-sectional view showing a configuration example in which the infrared transmission layer 9 ir is formed after the light-resistant colored resin layer 3 with respect to the transparent substrate 1. If a layer having a unit OD exceeding 2.0 for visible light is used for the infrared transmission layer 9ir, the infrared transmission layer 9ir behaves as the colored resin layer 4 for visible light. The infrared transmission layer 9ir is formed on the entire surface of the light-resistant colored resin layer 3 in which the portion to be the infrared transmission window 9 is not formed, including the portion of the infrared transmission window 9 that is not formed. Can do. The infrared transmission layer 9 ir is the layer closest to the translucent substrate 1 among the constituent layers of the light shielding layer 2 in the portion of the infrared transmission window 9. In the case of a circular shape, the size of the infrared transmission window 9 is usually as small as 1 to 2 mm in diameter, so that a change in regular reflectance due to some light resistance is acceptable.
By doing in this way, the infrared transmission layer 9ir also functions as a backing layer, and the light-resistant colored resin layer 3 and the infrared transmission layer 9ir ensure the necessary light-shielding properties as the light-shielding layer 2, while allowing infrared transmission. Windows 9 can be provided without additional layers and without cost.

  Alternatively, the infrared transmission layer 9ir can also be provided as a layer having a unit OD of 2.0 or less and 0.5 or more, like the light-resistant colored resin layer 3. In this case, the infrared transmission layer 9ir corresponds to the light-resistant colored resin layer 3 and is a layer having light resistance. In this way, even if the infrared transmission layer 9ir in the infrared transmission window 9 is the layer closest to the translucent substrate 1 among the constituent layers of the light shielding layer 2, the infrared transmission window 9 The light resistance of the infrared transmitting layer 9ir itself can be improved including this part.

(Simultaneous formation of infrared transmission window 9 and notification window 9)
As described above, as the infrared transmission layer 9ir in the form provided on the light-resistant colored resin layer 3, (a) a layer corresponding to the light-resistant colored resin layer 3 having a unit OD of 2.0 or less and 0.5 or more is provided. There exists a form which provides the layer applicable to the normal coloring resin layer 4 with a form or (b) unit OD exceeding 2.0.
In both (a) and (b), the notification window 9 is red at a position different from the infrared transmission window 9 by making the portion to be the notification window 9 a non-formation portion of the light-resistant colored resin layer 3. The advantage that it can be formed simultaneously with the outer transmission window 9 is obtained.

[Notification window 9]
When the display device is a mobile phone, the notification window 9 can notify the user of various operation states such as an incoming call and a battery charging state by blinking, lighting, and color of light. Normally, notification windows 9 are used to notify various operating conditions by operating a notification light source, typically an LED (light emitting diode), provided inside the case of the notification window 9.
The notification window 9 is provided as a part including a non-formation part of the light shielding layer 2 in the opaque region A2. The light for notification can be passed from the back side to the front side of the front protective plate 10 for the display device at the non-formed portion of the light shielding layer 2.
The “part including a non-formation part” means that the formation part of the light shielding layer 2 may exist in the area of the notification window 9.

(Translucent structure of notification window 9)
The first form of the notification window 9 is that the light shielding layer 2 does not exist at all in the entire region, that is, a form in which the light shielding layer 2 is not formed, and a second form is the transmission of light for notification. There is a form in which the formation part of the light shielding layer 2 exists in the area of the notification window 9 to the extent that it does not hinder. In the second form, the notification window 9 has a semi-transmissive structure that has a certain degree of light blocking property as well as a visible light transmitting property. For example, the transmittance for visible light at the notification window 9 is about 10% (optical density OD1.0).
By making the notification window 9 a semi-transmissive structure, the presence of the notification window 9 can be made inconspicuous when the notification light is turned off, and the sense of unity of the design of the opaque region A2 by the light shielding layer 2 is increased. Can do.

In the present invention, in the second embodiment adopting the transflective structure, the notification window 9 is used without adding a special layer dedicated to the notification window 9 by using the light-resistant colored resin layer 3 and the normal colored resin layer 4. Can be configured. This form will be described with reference to FIG.
In the figure, a light-resistant colored resin layer 3 is formed on a light-transmitting substrate 1, and a portion of the notification window 9 is formed on the light-resistant colored resin layer 3 in a region on the light-resistant colored resin layer 3. By forming the normal colored resin layer 4, the non-formation portion of the normal colored resin layer 4 on the light-resistant colored resin layer 3 is configured as a notification window 9. At this time, the light-resistant colored resin layer 3 is given a certain degree of transparency to visible light as the notification window 9. Accordingly, the light-resistant colored resin layer 3 has a transmittance of 1% when the thickness is 1 μm in the unit OD2.0, and the transmittance is small as the notification window 9. For example, when the thickness is 1 μm with the unit OD1.0, the transmittance is about 10%. Therefore, a preferable transmittance can be obtained as the notification window 9. The light-resistant colored resin layer 3 may be a unit OD that is uniform over the entire surface including the notification window 9. If the light-resistant colored resin layer 3 and the normal colored resin layer 4 have similar colors, the notification window 9 can be made less noticeable.

  Although not shown, the light-resistant colored resin layer 3 of the notification window 9 is formed in a dot shape, or conversely, the non-forming portion is formed in a dot shape so that the notification window 9 is meshed, etc. The non-formed part may allow light to pass through and adjust the transmittance for visible light in the light-resistant colored resin layer 3 by the area ratio of the non-formed part. Therefore, when the unit OD2.0 of the light-resistant colored resin layer 3 has a thickness of 1 μm, if the area ratio of the non-formed part is 10%, it is apparently the same as the unit OD1.0 as a pseudo semi-transparent structure. Can be. On the contrary, the notification window 9 may be formed in a mesh shape in the normal colored resin layer 4.

  As described above, conventionally, in order to make the notification window 9 inconspicuous, in the present invention, a part of the notification window 9 is made a semi-transmissive structure by using an additional layer. In the form of the light-shielding layer 2 having both the light-resistant colored resin layer 3 and the normal colored resin layer 4, it is possible to form a noticeable window 9 that is not noticeable without an additional layer. In addition, the notification window 9 can be provided without cost.

[Positioning of transparent electrode 5 on touch panel]
In the embodiment described above, the use of the transparent electrode 5 and the wiring 7 is a touch panel.
As a position detection method of the touch panel, in the position detection method in which the transparent electrode 5 has two layers on different surfaces, there may be a form in which at least one of these layers is provided.
The transparent electrode 5 may be of a system other than the projected capacitive system, such as a resistive film system.

In the present invention, when the front protective plate 10 for a display device has the transparent electrode 5 and the wiring 7 for a touch panel, some other touch panel functions such as a connector and a control circuit, and further all of them are provided. May be integrated.
The front protective plate 10 for a display device that integrates all the functions necessary for a touch panel can also be called a touch panel. The front protective plate 10 for a display device that integrates a part of functions necessary as a touch panel can also be referred to as a touch panel member.

[Overcoat layer]
In the present invention, although not shown, an overcoat layer is used as the outermost layer on the first surface S1 side, which is the side where the light shielding layer 2 is formed, such as the surface after the wiring 7 and the transparent electrode 5 are formed. May be formed. The overcoat layer may be formed including the opaque region A2 having the light shielding layer 2 and the display region A1. In this case, the overcoat layer is formed as a transparent layer so as not to hinder display.
The overcoat layer formed in contact with the wiring 7 or the transparent electrode 5 is insulative. The overcoat layer formed on the wiring 7 does not form a portion where the wiring 7 is connected to the control circuit via a flexible printed circuit board (FPC), and the wiring 7 is exposed.
The overcoat layer can improve insulation, scratch resistance and the like.

  The overcoat layer is provided to reduce the level difference caused by the light shielding layer 2 and reduce the disconnection at the level difference portion when the transparent electrode 5 and the wiring 7 are formed on the light shielding layer 2 after the light shielding layer 2 is formed. You can also. In this case, the overcoat layer is usually provided on the entire surface including the opaque region A2 having the light shielding layer 2 and the display region A1.

The overcoat layer is preferably a transparent resin, which is preferably a curable resin in terms of heat resistance. For example, an epoxy resin, an acrylic resin, a polyimide resin, or the like can be used. A curable epoxy resin or the like can be used. The overcoat layer can be formed by the same coating method as that for the light-resistant colored resin layer 3.
Further, as the curable resin, the photosensitive resin described in the light-resistant colored resin layer 3 can be used. In the case of a photosensitive resin, a photolithography method can be used when partially forming.

[C] Display device:
The display device according to the present invention is a display device including at least the display device front protective plate 10 and a display panel.

<< First Embodiment >>
A display device according to a first embodiment of the present invention will be described with reference to a cross-sectional view shown in FIG. A display device 100 shown in the figure includes a display device front protective plate 10, a touch panel 20, and a display panel 30 in order from the front side on the viewer V side above the drawing.

[Front protective plate 10 for display device]
The display device front protective plate 10 according to the present embodiment has a form that does not include the transparent electrode 5 and the wiring 7 for the touch panel, for example, the form illustrated in FIG.

[Touch panel 20]
The touch panel 20 is typically a projected capacitive touch panel capable of multi-touch (multi-point simultaneous input), but in addition, a surface capacitive method, a resistive film method, an electromagnetic induction method, Any of various known position detection touch panels including a position detection method that does not require a transparent electrode, such as an optical method, may be used.
The touch panel 20 has some opaque components such as a wiring, a control circuit, and a connector that electrically connects them on the outer periphery of the central position detection region. These opaque components are in a positional relationship between the touch panel 20 and the display device front protective plate 10 so as to overlap and hide the light shielding layer 2 in the opaque region A2 of the display device front protective plate 10 in plan view. It has become. For this reason, opaque components such as these wirings can be prevented from deteriorating the appearance of the display device 100.

[Display panel 30]
The display panel 30 is typically a liquid crystal display panel or an electroluminescent (EL) panel, but may be an electronic paper panel or a cathode ray tube, or various known display panels.

[Effect in this embodiment]
By using the display device 100 configured as described above, the display content itself that is present in the outer periphery of the position detection region of the touch panel 20 or the outer periphery of the display region of the display panel 30 is unnecessary. Various components such as wiring, connectors, and control circuits can be hidden to prevent the appearance from being damaged.
Moreover, the light-shielding layer 2 of the front protective plate 10 for a display device has improved light resistance of the light-resistant colored resin layer 3 and can be a highly reliable product.

<< Second Embodiment >>
A second embodiment of the display device according to the present invention will be described with reference to the cross-sectional view shown in FIG. The display device 100 shown in the figure includes a display device front protective plate 10 and a display panel 30 in which a touch panel function is integrated in order from the front side on the observer V side above the drawing.
The display panel 30 is the same as that in the first embodiment. Therefore, here, the front protective plate 10 for a display device in which the touch panel function is integrated will be further described.

[Front protective plate 10 for display device]
The front protective plate 10 for a display device in the present embodiment is a form having the transparent electrode 5 for the touch panel, the wiring 7 and the like, for example, the form illustrated in FIG. 5 described above.

  The display device front protective plate 10 according to this embodiment includes other functions as a touch panel function, for example, a connector, a control circuit, and the like, so that a part or all of the functions of the touch panel are integrated. The protective plate 10 may be used.

  The transparent electrode 5 and the wiring 7 included in the front protective plate 10 for a display device are typically for a projected capacitive touch panel capable of multi-touch (multi-point simultaneous input). Any of various known position detection touch panels that require a transparent electrode, such as a surface capacitive method, a resistive film method, and an electromagnetic induction method, may be used.

[Effect in this embodiment]
With such a configuration, in addition to the effects of the first embodiment as the display device, the effects of reducing the number of parts and reducing the thickness can be obtained.
Moreover, the light-shielding layer 2 of the front protective plate 10 for a display device has improved light resistance of the light-resistant colored resin layer 3 and can be a highly reliable product.
Furthermore, it also has a touch panel function, which can contribute to reducing the number of parts and reducing the weight.

<< Deformation as display device >>
The display device 100 of the present invention can take other forms besides the above-described form. Some of these will be described below.

[Front protection plate 10 for a display device in which a part of the touch panel function is integrated]
When the transparent electrode 5 for the touch panel to be integrated is composed of two layers of the first electrode 5a and the second electrode 5b that are insulated from each other, and the two layers are formed on different substrates, One of these substrates is also used as the transparent substrate 1 of the front protective plate 10 for the display device, so that it is integrated with one transparent electrode, and the other transparent electrode and the substrate are integrated with the front surface for the display device. The display device 100 can be configured by being incorporated as a touch panel constituent member separate from the protective plate 10 and the display panel 30. What is necessary is just to select the structure suitable for various conditions, such as the manufacturing equipment which can be used, an assembly process, as what structure the front surface protection plate 10 for display apparatuses and a touch panel function are integrated.

  Even in such a configuration, since the touch panel function is integrated, the number of parts is reduced, the number of assembling steps is reduced, and the cost can be reduced. Moreover, the light shielding layer 2 of the front protective plate 10 for display device has improved light resistance, and a highly reliable product is possible.

[Interposition of resin layer such as adhesive sheet]
The display device 100 according to the embodiment illustrated in FIGS. 10 and 11 has a structure in which an air layer exists between the constituent members of the display device front protective plate 10 and the display panel 30. In the invention, between the constituent members such as the front protective plate 10 for the display device and the display panel 30 may be filled with a resin layer such as an adhesive layer. Since the light reflection on the surface of the member is reduced by the resin layer, the display can be more easily seen.

For the resin layer, a pressure-sensitive adhesive sheet, a solidified layer of the applied resin liquid, or the like can be used.
As the pressure-sensitive adhesive sheet, an optical grade sheet excellent in transparency is preferable, and as such a pressure-sensitive adhesive sheet, an acrylic pressure-sensitive adhesive, a polyester-based pressure-sensitive adhesive, an epoxy-based pressure-sensitive adhesive, a silicone-based pressure-sensitive adhesive, or the like is used. Can be used.

[D] Application:
Applications of the display device front protective plate 10 and the display device 100 according to the present invention are not particularly limited. For example, a mobile phone such as a smartphone, a portable information terminal such as a tablet PC, a personal computer, a car navigation device, a digital camera, an electronic book terminal, an electronic notebook, a game machine, an automatic ticket vending machine, an ATM terminal, a POS terminal, and a vending machine. .

DESCRIPTION OF SYMBOLS 1 Translucent board | substrate 2 Light shielding layer 2a Colored resin layer 3 Light resistant colored resin layer 4 Normal colored resin layer 5 Transparent electrode 5a 1st electrode 5aC 1st connection part 5aE 1st transparent electrode element 5b 2nd electrode 5bC 2nd connection part 5bE Second transparent electrode element 5C Intersection 6 Insulating layer 7 Wiring 8 Visible information 9 Window, infrared transmission window, notification window 9ir Infrared transmission layer 10 Front protective plate for display device 20 Touch panel 30 Display panel 40 Front surface for conventional display device Protective plate 100 Display device 200 Conventional display device A1 Display area A2 Opaque area S1 First surface S2 Second surface V Observer

Claims (4)

A front protective plate for a display device having a central display area and an opaque area that is provided on the outer periphery of the display area and shields visible light,
A light-transmitting substrate, and a light-shielding layer provided in the opaque region on one surface of the light-transmitting substrate;
Having at least
The light shielding layer includes a color pigment in a resin binder using a cured product of a photosensitive resin at a position closest to the light-transmitting substrate among the light shielding layers as a constituent layer of the light shielding layer,
The optical density is determined from the transmittance T in the visible light region having a wavelength of 380 to 780 nm.
Optical density = Log (1 / T)
When the optical density per 1 μm thickness is defined as a unit OD,
Having a light-resistant colored resin layer in which the unit OD is 2.0 or less and 0.5 or more,
Front protective plate for display devices. A normal colored resin containing a color pigment in a resin binder using a cured product of a photosensitive resin on one surface of the translucent substrate and on the light-resistant colored resin layer, wherein the unit OD exceeds 2.0. A layer as a constituent layer of the light shielding layer,
The front protective plate for a display device according to claim 1. Transparent for a touch panel provided on one surface of the translucent substrate and on the translucent substrate and the light shielding layer so as to extend from the display region to the opaque region having the light shielding layer. Electrodes,
An opaque wiring provided on the light shielding layer so as to be electrically connected to the transparent electrode at a portion of the light shielding layer;
Having
The front protective plate for a display device according to claim 1 or 2.   A display device comprising the front protective plate for a display device according to claim 1 and a display panel.

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