JP6019958B2 - Front protective plate for display device and display device - Google Patents

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 the electromagnetic induction method and the resistive film method, have been known for a long time, and they have been used for various applications. This is a capacitive touch panel capable of simultaneous input).

FIG. 26 is a diagram schematically illustrating an example of a conventional display device 200 including the touch panel 20. FIG. 26A is an exploded plan view, and the cross-sectional view of FIG. 26B is the exploded plan view of FIG. 26A, in which the conventional front protective plate 40 for a display device is cut along line CC. 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).
In the conventional front protective plate 40 for a display device, as shown in FIG. 26, the outer periphery of the display area A1 is usually an opaque area A2, and the light shielding layer 2 is translucent in the opaque area A2. 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.

Between the members of the front protective plate 40 for the display device, the touch panel 20 and the display panel 30, a resin is used without providing a space in order to reduce display light loss due to interface reflection and external light reflection to make the display easier to see. In some cases, the layers are buried in close contact.
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, photosensitive resin is used because there is a point that pattern printing cannot be performed with screen printing with high positional accuracy, and there is a point that the film thickness becomes thick and it is easy to break at the step part when integrating transparent electrodes and wiring for touch panels. It may be possible to form a cured layer of a photosensitive resin by a conventional photolithography method. 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 translucent substrate;
A light-shielding layer that is provided in the opaque region on one surface of the translucent substrate and includes a colored resin layer in a resin binder using a cured product of a photosensitive resin as a constituent layer;
An oxygen barrier layer provided on the one surface so as to cover the colored resin layer;
Having at least
Front protective plate for display devices.

(2) A transparent electrode for a touch panel provided on the one surface so as to extend from the display region to a portion of the opaque region having the light shielding layer;
An insulating layer on the one surface and provided on the oxygen barrier layer;
An opaque wiring provided on the one surface and on the insulating layer so as to be electrically connected to the transparent electrode at a portion of the light shielding layer;
Have
The oxygen barrier layer and the transparent electrode are formed of a transparent conductor thin film of the same material,
(1) The front protective plate for a display device.
(3) On the one surface, a transparent electrode for a touch panel provided so as to extend from the display region to a portion of the opaque region having the light shielding layer;
An insulating layer on the one surface and provided on the oxygen barrier layer;
An opaque wiring provided on the one surface and on the insulating layer so as to be electrically connected to the transparent electrode at a portion of the light shielding layer;
Have
The oxygen blocking layer and the transparent electrode are formed of a conductive metal layer in which the same material layer itself is opaque,
The transparent electrode includes a mesh electrode that ensures transparency by being formed in a mesh shape at least in the display region.
(1) The front protective plate for a display device.

(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, light resistance can be improved for a colored resin layer using a photosensitive resin constituting a light shielding layer.
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 board 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 regular reflectance of a light shielding layer. The graph which shows transition of the regular reflectance of a light shielding layer. The graph which shows transition of the change of the regular reflectance of a light shielding layer. The partial expanded sectional view which shows the modification (interlayer overcoat layer) of 1st Embodiment of the front-surface protection plate for display apparatuses by this invention. The top view which looked at 2nd Embodiment (transparent conductor thin film, touch panel integration) of the front surface protection plate for display apparatuses by this invention from the back side. The partial expanded sectional view which shows typically 2nd Embodiment of the front surface protection plate for display apparatuses by this invention. The partial enlarged plan view which shows the formation order around the cross | intersection part of the transparent electrode in 2nd Embodiment of the front-surface protection plate for display apparatuses by this invention. The partial expanded sectional view which shows the cross | intersection part periphery of a transparent electrode in CC line in FIG.8 (C). The partial enlarged plan view which shows the formation order of the circumference | surroundings of the intersection of the transparent electrode corresponding to FIG. 8 with the modification (crossing part reverse structure) of 2nd Embodiment of the front-surface protection plate for display apparatuses by this invention. FIG. 11 is a partially enlarged cross-sectional view showing the periphery of the intersection of the transparent electrodes, taken along the line CC in FIG. The partial expanded sectional view which shows typically the modification (crossing part reverse structure) of 2nd Embodiment of the front surface protection plate for display apparatuses by this invention corresponding to FIG. The partial enlarged plan view which shows the 3rd Embodiment (the mesh of a conductive metal layer, touchscreen integration) of the front-surface protective plate for display apparatuses by this invention which shows the periphery of the cross | intersection part of the transparent electrode. The partial expanded sectional view which shows typically 3rd Embodiment of the front surface protection plate for display apparatuses by this invention. The partial enlarged plan view which shows the mesh shape of a transparent electrode in 3rd Embodiment of the front surface protection plate for display apparatuses by this invention. The partial enlarged plan view which shows the circumference | surroundings of the crossing part of the transparent electrode corresponding to FIG. 13 in the modification (crossing part reverse structure) of 3rd Embodiment of the front-surface protection plate for display apparatuses by this invention. The partial expanded sectional view which shows typically the modification (crossing structure reverse structure) of 3rd Embodiment of the front surface protection plate for display apparatuses by this invention corresponding to FIG. The partial expanded sectional view which shows typically the deformation | transformation form (transparent oxygen barrier layer of the whole surface) of the front surface protection plate for display apparatuses by this invention. The partial expanded sectional view which shows typically the deformation | transformation form (insulating layer which coat | covers a conductive oxygen interruption | blocking layer) of the front surface protection plate for display apparatuses by this invention. The partial expanded sectional view explaining the infrared transmission layer of an infrared transmission window as another structural layer of a light shielding layer. The partial expanded sectional view which shows typically the deformation | transformation form (The oxygen interruption | blocking layer formed simultaneously with the insulating material of the intersection part of the transparent electrode for touchscreens with the same material) of the front surface protection plate for display apparatuses by this invention. The partial expanded sectional view which shows typically the deformation | transformation form (The colored resin layer which conceals the transparent electrode for touchscreens which consists of an electroconductive metal layer) of the front surface protection plate for display apparatuses by this invention. The partial expanded sectional view which shows typically the deformation | transformation form (oxygen barrier layer which is not formed simultaneously with the transparent electrode for a touch panel, or an insulating layer) of the front surface protection plate for display apparatuses by this invention. Sectional drawing which illustrates typically one Embodiment of the display apparatus by this invention. Sectional drawing which illustrates another 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. This means the side that observes the panel display.
The “back side” means a side opposite to the “front side”, and means a side where display light of the display panel enters in the front protective plate for display device or other components.
With respect to the surface of the translucent substrate 1, “one surface” is the surface on which the colored resin layer 2 a constituting the light shielding layer 2 and the oxygen blocking layer 3 are necessarily provided. “One surface” means the “back side” surface, and “the other surface” means the “front side” 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 colored resin layer 2a is provided as a layer, and the light shielding layer 2 exhibits a color such as black due to the colored resin layer 2a.

  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. It is the form assumed to be used toward the viewer V side of the panel.

The colored resin layer 2a contains a color pigment in a resin binder using a cured product of a photosensitive resin.
The colored resin layer 2a 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.

  Thus, in the present embodiment, the light-shielding layer 2 is a layer that ensures a light-shielding property while expressing a color design such as black by the colored resin layer 2a. For this reason, 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.

Further, the oxygen blocking layer 3 is formed on the surface of the first surface S1, which is one surface after the light shielding layer 2 of the translucent substrate 1 is formed, so as to cover the entire surface of the colored resin layer 2a. Has been. In the present embodiment, the oxygen blocking layer 3 is formed only on the colored resin layer 2a. Accordingly, the oxygen blocking layer 3 is not formed on the entire surface of the display area A1.
In the present embodiment, as shown in FIG. 1A, the display device front protective plate 10 has visible information 8 such as a product logo, and the oxygen barrier layer 3 is a portion of the visible information 8. Therefore, the oxygen blocking layer 3 is formed over the entire opaque region A2.

  In the present invention, the oxygen blocking layer 3 can suppress the light deterioration of the colored resin layer 2a, and the light resistance of the light shielding layer 2 using the colored resin layer 2a is improved.

  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 in the present embodiment is formed in a portion of the opaque region A2 of the first surface S1 on the back side that is the display panel side of the translucent substrate 1. The light shielding layer 2 is provided in the entire area in the opaque area A2. In other words, the opaque region A2 is formed as an opaque region by the light shielding layer 2.
In the present embodiment, the light shielding layer 2 is formed in the opaque region A2 of the surface of the first surface S1 as one of the first surface S1 and the second surface S2 of the translucent substrate 1.
The light shielding layer 2 has a wiring 7 and a control circuit on its outer peripheral part with respect to a central position detection region as a touch panel, or a wiring and a control circuit on its outer peripheral part with respect to its central display region. In the display device combined with the display panel, it has a function of preventing the appearance from being impaired.

  The light shielding layer 2 has a function of improving the appearance design as well as a light shielding property for hiding unnecessary parts. In the present embodiment, the light shielding layer 2 includes the colored resin layer 2a as one constituent layer. The colored resin layer 2 a is improved in light resistance by the oxygen blocking layer 3. 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.

[Colored resin layer 2a]
The colored resin layer 2a is composed of a layer containing a colored pigment in a resin binder using a cured product of a photosensitive resin.

  The formation method of the colored resin layer 2a is basically not particularly limited. For example, a colored photosensitive resin composition containing a colored pigment and an uncured photosensitive resin is applied on the surface of the translucent substrate 1. Then, it can be formed by a so-called photolithography method in which exposure is performed in a predetermined pattern and development is performed. In the present embodiment, the colored resin layer 2a is formed by a photolithography method.

(Color pigment)
The colored pigment is not particularly limited as long as it is suitable for the color expressed by the colored resin layer 2a and the light shielding layer 2. For example, as a colored pigment, a black pigment, a white pigment, a red pigment, a yellow pigment, a blue pigment, a green pigment, a purple pigment, or 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.
As the black pigment, for example, carbon black and titanium black (low-order titanium oxide, titanium oxynitride, etc.) can be used. 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. Further, when a dark color such as black is expressed, a black color 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 monomer 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 alkylphenone series, oxime ester series, triazine series, titanate series and the like 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- In benzyl-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 colored resin layer 2a can contain various known additives such as a photosensitizer, a dispersant, a surfactant, a stabilizer, and a leveling agent.

  As described above, the colored resin layer 2a 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 constituting the resin binder is as follows. However, it is not limited to a cured product of only a photopolymerizable compound, for example, it is not a photopolymerizable compound that can be used as the above-mentioned dispersant, surfactant, or the alkali-soluble resin blended for alkali development suitability. It is a cured product that can usually contain a photopolymerizable polymer and other non-photopolymerizable compounds.

(Expression color by colored resin layer 2a)
The expression color by the colored resin layer 2a is typically black, but is not particularly limited. For example, blue, green, red, brown, orange, or white color may be used.

In addition to pure white (pure white), the above white color is ivory, beige, reddish white (light pink), yellowish white, yellowish white, and bluish white Blue white, greenish white that is greenish white, purple white that is purple white, brownish white that is brownish white, gray that is blackish white (light gray), silvery white that is silvery white, Also included are chromatic and whitish colors, and achromatic and whitish colors, such as gold-white that is golden white.
If these white colors are numerically shown, they can be defined using various color systems. In particular, if shown by the Munsell color system (JIS Z 8721), which is one of the conventional color systems, in the present invention, the white color is a lightness of 8.0 or more in the Munsell color system. Further, it can be defined as a color having a saturation of 2.0 or less. The hue of the white color can be any color.

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 white color can be set to 8, even if the brightness is small, and can be set to 8.0 or more. 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. Since the white color is a whitish color, the saturation can be 2 or less and 2.0 or less.
The three attributes of the Munsell color system can be measured with a commercially available spectrophotometer, spectrophotometer, or the like.
Among the white colors, particularly whitish colors are expressed by the Munsell color system, the color is 9.0 or more in brightness and 1.0 or less in saturation, and the whitish color is lightness. Is a color with 9.0 or more and saturation of 1.0 or less.

(Formation of colored resin layer 2a)
The formation method of the colored resin layer 2a has already been described as being not particularly limited in the present invention, but the colored resin layer 2a contains a colored pigment in a resin binder containing an uncured product of the photosensitive resin. It can form with a coloring photosensitive resin composition. The colored resin layer 2a is preferably formed by a photolithography method. This is because the colored resin layer 2a can be formed with higher pattern accuracy and less difficulty in disconnection of the stepped portion as compared with the case of forming by screen printing.
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.

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

  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.

  After the colored photosensitive resin composition is applied on the surface of the light-transmitting substrate 1, the light-transmitting substrate is patterned by a predetermined process such as exposure, development, baking, etc. using a photolithography technique. A colored resin layer 2 a having a predetermined pattern can be formed on a part of the surface of 1.

[Oxygen barrier layer 3]
The oxygen blocking layer 3 is a layer that prevents oxygen in the air from coming into contact with the colored resin layer 2a that may have insufficient light resistance. For this reason, the oxygen barrier layer 3 is a layer having a low oxygen permeability.
The oxygen blocking layer 3 may be formed so as to cover at least the colored resin layer 2a with the colored resin layer 2a, but may be formed on the entire surface of the display area A1 and the opaque area A2. When it is formed on the entire surface, a transparent layer is used so as not to hinder the display in the display area A1.

In the present embodiment, the oxygen blocking layer 3 is formed as a transparent layer. For this reason, the transparency as the display region A1 is secured even in the portion (usually about 5 to 20 μm) that protrudes from the opaque region A2 toward the display region A1 and covers the side surface portion of the colored resin layer 2a. Yes. If the oxygen blocking layer 3 is opaque, the portion of the oxygen blocking layer 3 that protrudes from the colored resin layer 2a also becomes the opaque region A2. Thus, even when the oxygen blocking layer 3 is not formed in the entire area of the display area A1, the oxygen blocking layer 3 is transparent when covering the colored resin layer 2a including the side surface of the colored resin layer 2a. This is preferable in that the display area A1 is not narrowed. However, even if the oxygen blocking layer 3 protrudes into the display area A1, it is slight as described above. Therefore, in the present invention, the oxygen blocking layer 3 may be opaque.
However, in the present invention, the oxygen blocking layer 3 is not essential until the side surface of the colored resin layer 2a is covered. This is because the side surface is smaller in area than the layer surface parallel to the first surface S1 of the oxygen blocking layer 3.

The oxygen blocking layer 3 is not particularly limited as long as the colored resin layer 2a exhibits a low oxygen permeability that does not change when the colored resin layer 2a receives sunlight. For example, as the oxygen blocking layer 3, an inorganic material such as silicon oxide, aluminum oxide, silicon oxynitride, silicon nitride, or acrylic resin, polyester resin, epoxy resin, polyvinyl alcohol resin, cellulose resin, polyvinyl cinnamate An organic material such as a resin or a polyimide resin can be used.
The material and thickness of the oxygen blocking layer 3 are such that the oxygen permeability [cm ³ / (m ² · d · atm)] of the layer is 1 under the conditions of JIS K7126-2 Method A, 23 ° C., 50% RH. It is set to be 0 or less, preferably 0.1 or less.
If the oxygen permeability is too large, photodegradation may easily occur, and if it is too small, only excessive performance is obtained.
The oxygen blocking layer 3 can be formed by a physical or chemical vapor deposition method such as a sputtering method for an inorganic material, and can be formed by a coating method for a resin material.

As the oxygen blocking layer 3, a transparent conductor thin film whose layer itself is transparent can also be used.
Examples of the transparent conductor thin film include ITO (Indium Tin Oxide), IZO (registered trademark; Idemitsu Kosan Co., Ltd.) (Indium Zinc Oxide), AZO (Aluminum Zinc Oxide), and aluminum zinc oxide. A transparent conductor thin film such as IGZO (Indium Gallium Zinc Oxide).
What is used as what is called a transparent electrode can be employ | adopted for a transparent conductor thin film. However, since the oxygen blocking layer 3 itself does not need conductivity, it does not have to have the conductivity necessary for the transparent electrode.

As the oxygen blocking layer 3, a metal layer that is opaque can be used.
As the metal layer, for example, a metal (including alloys thereof) such as silver, gold, copper, chromium, platinum, aluminum, palladium, and molybdenum can be used. The metal layer can be formed into a pattern by a photolithography method after being formed by sputtering, for example, as a metal layer of a silver alloy (also referred to as APC) made of silver, palladium, and copper.
As a specific example, the metal layer is made of molybdenum (Mo) / aluminum (Al) / molybdenum (Mo), a three-layered conductive layer (called MAM), silver, palladium, and copper. A metal layer made of a silver alloy (also referred to as APC) or the like can be used.
There is no restriction | limiting in particular as a formation method of a metal layer, You may form by printing methods, such as a screen printing method and an inkjet printing method, besides the photolithography method.
As the metal layer, a conductive metal layer used as a so-called metal wiring can be employed. However, since the oxygen blocking layer 3 itself does not need conductivity, it does not have to have the conductivity necessary for the metal wiring.

〔Production method〕
Each layer constituting the front protective plate 10 for a display device of the present embodiment is formed as follows, for example.
1) First, the colored resin layer 2a constituting the light shielding layer 2 is formed in a pattern in the region to be the opaque region A2 of the first surface S1 of the translucent substrate 1.
2) Next, the oxygen blocking layer 3 is formed on the colored resin layer 2a so as to cover the colored resin layer 2a including its side surfaces.

[Light resistance improvement mechanism by oxygen blocking layer 3]
In the present invention, in order to improve the light fastness of the colored resin layer 2a used for the light shielding layer 2, the oxygen blocking layer 3 may be transparent to transmit light on the side opposite to the direction in which the light hitting the colored resin layer 2a comes. Provide a layer. If it is a normal idea for measures to improve the light resistance of the colored resin layer 2a, the light resistance is improved by providing, for example, an ultraviolet absorbing layer having an ultraviolet absorbing function on the side where the light comes to the colored resin layer 2a. I will let you. The ultraviolet absorbing layer 2 is transparent to visible light because the color of the colored resin layer 2a needs to be visible from the front side. In addition, if light resistance occurs as a decrease in adhesion, an adhesion enhancing layer such as a primer layer may be provided between the transparent substrate 1 on which the colored resin layer 2a is formed and the colored resin layer 2a. Conceivable.
Surprisingly, however, the inventor of the present invention improves the light resistance of the colored resin layer 2a by providing the oxygen blocking layer 3 on the side opposite to the direction in which the light comes, that is, on the back side of the colored resin layer 2a. It was discovered accidentally and it came to this invention.
Accordingly, the oxygen blocking layer 3 does not have a function of blocking light that causes the photodegradation of the colored resin layer 2a. For this reason, the mechanism by which the light resistance of the colored resin layer 2a is improved by providing the oxygen blocking layer 3 is unknown at this stage. However, the mechanism of the light resistance improvement by the oxygen blocking layer 3 is imagined from the fact that the light resistance is improved by the oxygen blocking layer 3 provided on the back side of the colored resin layer 2a. It is considered that the presence of oxygen in the air affects the deterioration as well as the light. That is, oxygen is supplied from the back side of the colored resin layer 2a, and the photooxidation reaction of the substance in the colored resin layer 2a is promoted by the cooperative action of this oxygen and the light reaching from the front side. It is.

(Light resistance index)
In the present embodiment, as the light resistance index of the colored resin layer 2a, the degree of increase in regular reflectance over time when the colored resin layer 2a is expressed in black and the decrease in adhesion are employed.
In the present invention, the light resistance index is basically not particularly limited as long as the performance of the colored resin layer 2a is deteriorated by 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 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 colored resin layer 2a was measured to increase the regular reflectance. It was judged that the light resistance was improved by the decrease in the light resistance.
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.

FIG. 2 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 a microspectrophotometer on the interface between the translucent substrate 1 and the colored resin layer 2a.
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 100 hours or longer, preferably 500 hours or longer, more preferably 1000 hours or longer. It can be said that the light resistance is improved if the change of the light resistance index is reduced by the oxygen blocking layer 3 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 transition of regular reflectance in this embodiment is shown in the graph of FIG. 3, and the transition of regular reflectance 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.
From these graphs, it can be seen that the provision of the oxygen blocking layer 3 reduces the change in regular reflectance and improves the light resistance.
If the change in the regular reflectance is 0.15 or more, the change can be discerned with the naked eye. Therefore, the change in the regular reflectance is preferably less than 0.15, depending on the required level.
In the present embodiment, the change in regular reflectance is less than 0.15 until the test time by the light resistance tester is at least 300 h, and it can be seen that the light resistance is improved in practice.

(Adhesion)
In this embodiment, the improvement of light resistance was confirmed also in terms of adhesion. The adhesion can be evaluated in accordance with the cross-cut tape method of JIS K5400 (1990). Specifically, 100 square grids made of squares of 1 mm size are made by cutting with a cutter knife at intervals of 1 mm from above the colored resin layer 2a of the test piece. 1 to 2 minutes after applying the adhesive tape (manufactured by Nichiban Co., Ltd.), hold one end of the cellophane adhesive tape, keep it perpendicular to the surface of the test piece, From the state, the adhesion is evaluated by an evaluation score.

The best evaluation score is 10 points, the worst is 0 points, and the evaluation is made according to the following criteria.
10 points: Each cut is thin, both ends are smooth, and there is no peeling of the grid.
8 points: There is a slight peeling at the intersection of the cuts, but there is no peeling of the grid, and the area of the defect is within 5% of the entire grid.
6 points: There is peeling at both sides of the cut and at the intersection, and the area of the missing part is 5 to 15% of the entire grid.
4 points: The width of peeling due to cuts is wide, and the area of the missing part is 15 to 35% of the entire grid.
2 points: The width of peeling due to cuts is wider than 4 points, and the area of the missing part is 35 to 65% of the entire grid.
0 point: The area of the missing part is 65% or more of the entire grid.

  In the present embodiment, when the test time by the light resistance tester is 100 h, the evaluation score is 10 points compared to 0 point in the configuration in which the oxygen blocking layer 3 is not provided, and the light resistance is improved. Was recognized.

[Overcoat layer 4]
In the present invention, as shown in the sectional view of FIG. 5, an overcoat layer 4 can be provided between the colored resin layer 2 a and the oxygen blocking layer 3.
When the overcoat layer 4 is insufficient in the adhesion of the oxygen blocking layer 3 to the colored resin layer 2a, the adhesion can be improved.
Further, if the surface of the colored resin layer 2a is rough, the transparent conductor thin film as the oxygen blocking layer 3 cannot be formed as a homogeneous film, and the oxygen blocking performance may not be sufficiently exhibited. Thus, the formation surface can be flattened and prevented.

  For the overcoat layer 4, 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 overcoat layer 4 can be formed by the same coating method as the colored resin layer 2a. In the case of a photosensitive resin, a photolithography method can be used when partially forming.

[Effect in this embodiment]
In the present embodiment, the oxygen blocking layer 3 can improve the light resistance of the colored resin layer 2a using the photosensitive resin constituting the light shielding layer 2.

<< 2nd Embodiment: Touch panel integration and the oxygen interruption | blocking layer 3 by the transparent conductor thin film >>
This embodiment is a form example which also has the transparent electrode 5 and wiring 7 for touch panels.
The top view seen from the back side of FIG. 6, the typical partial expanded sectional view of FIG. 7, the partial enlarged plan view which shows the formation order of the cross | intersection part 5C of the transparent electrode 5 of FIG. 8, and the transparent electrode of FIG. 5 is a partially enlarged cross-sectional view around the intersection 5C, a partial enlarged plan view showing the formation order of the intersection 5C of the transparent electrode 5 in FIG. 10, and a partial enlargement around the intersection 5C of the transparent electrode 5 in FIG. A second embodiment of the front protective plate 10 for a display device according to the present invention will be described with reference to a sectional view and a schematic partial enlarged sectional view of FIG.
FIG. 6A 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. 6B and 6C are diagrams schematically showing 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 is formed at the intersection 5C of the first electrode 5a extending in the X direction and the second electrode 5b extending in the Y direction.
c) The transparent conductor thin film used as the oxygen barrier layer 3 is formed of the same material as the transparent electrode 5 at the same time.
d) Since the oxygen blocking layer 3 is conductive, the wiring 7 formed on the surface of the oxygen blocking layer 3 and the formation surface of the extraction portion of the transparent electrode 5 connected to the wiring 7 are made insulative. The insulating layer 6 is formed on the surface of the oxygen blocking layer 3.

  In the present invention, “insulating” means electrically insulating.

[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 all formed of the same material in the same embodiment in the present embodiment and in each embodiment described below. Therefore, in the present specification, when these are collectively referred to, they are also simply referred to as “transparent electrode 5”.

In general, in the projected capacitive touch panel, as shown in FIGS. 6A to 6C, the plurality of first electrodes 5a 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. 6C, 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. 6A, 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.

Further explanation will be given with reference to a partially enlarged sectional view of FIG. 7, a plan view for explaining the formation order of FIG. 8, and a partially enlarged sectional view showing the periphery of the intersection 5 </ b> C of FIG. 9.
The first electrode 5a and the second electrode 5b are insulated from each other by the insulating layer 6 at the intersection 5C. Normally, the insulating layer 6 is required at least at the intersection 5C between the first electrode 5a and the second electrode 5b. In this embodiment, the insulating layer 6 is also provided on the surface of the oxygen blocking layer 3. 6 are simultaneously formed of the same material as the insulating layer 6 at the intersection 5C in order to insulate the wiring 7 and the like from each other.

  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 structure in which these are formed on the surface), after forming one of the first electrode 5a and the second electrode 5b, for example, the first electrode 5a, a transparent insulating layer is formed on the entire surface. The second electrode 5b can also be formed on the surface. 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.

Such a structure of the intersecting portion 5C of the transparent electrode 5 can be formed as shown in FIG.
1) First, as shown in FIG. 8A, the bridge lower side portion 5aU to be the first connection portion 5aC is formed. At this time, although not shown in the figure, the oxygen blocking layer 3 is also simultaneously formed of the same material by the transparent conductor thin film constituting the bridge lower portion 5aU.
2) Next, the insulating layer 6 is formed as shown in FIG. At this time, although not shown in the figure, the insulating layer 6 on the surface of the oxygen blocking layer 3 is simultaneously formed of the same material by the material constituting the insulating layer 6 at the intersection 5C.
3) Next, as shown in FIG. 8C, all of the first electrodes 5a except the bridge lower side portion 5aU and all of the second electrodes 5b including the bridge portion 5bB are simultaneously formed of the same material.
4) After that, although not shown, the wiring 7 in the opaque region A2 is formed.
The order of 3) and 4) above may be reversed.
FIG. 9 is a partially enlarged cross-sectional view showing the periphery of the intersecting portion 5C of the transparent electrode, taken along the line CC in FIG. 8C.

  Thus, the front protective plate 10 for a display device according to this embodiment shown in the plan view of FIG. 6 and the partially enlarged sectional views of FIGS. 7 and 9 can be manufactured.

(Reverse structure intersection 5C)
The stacking order of the intersecting portions 5C can be reversed from that shown in FIGS. This is shown in FIG. 10, FIG. 11 and FIG. 10 shows a forming sequence corresponding to FIG. 8, FIG. 11 is a cross-sectional view corresponding to FIG. 9, and FIG. 12 is a cross-sectional view corresponding to FIG.

Such an inverse structure of the intersecting portion 5C of the transparent electrode 5 can be formed as shown in FIG.
1) First, as shown in FIG. 10A, all of the first electrodes 5a except the bridge portion 5aB and the extraction portion and the second electrode 5b including the bridge lower side portion 5bU and excluding the extraction portion are made of the same material. Form simultaneously. At this time, although not shown in the figure, the oxygen blocking layer 3 is simultaneously formed of the same material by the transparent conductor thin film constituting the first electrode 5a and the second electrode 5b.
2) Next, the insulating layer 6 is formed as shown in FIG. At this time, although not shown in the figure, the insulating layer 6 on the surface of the oxygen blocking layer 3 is simultaneously formed of the same material by the material constituting the insulating layer 6 at the intersection 5C.
3) Next, as shown in FIG. 10C, a bridge portion 5aB to be the first connection portion 5aC is formed. At this time, although not shown in the figure, the extraction portion which is a portion connected to the wiring 7 is formed simultaneously with the first electrode 5a and the second electrode 5b with the same material as the bridge portion 5aB.
4) After that, although not shown, the wiring 7 in the opaque region A2 is formed.
The order of 3) and 4) above may be reversed.
FIG. 10 is a partially enlarged cross-sectional view corresponding to the periphery of the intersection 5C of the transparent electrode, taken along line CC in FIG. 10 (C).

[Oxygen barrier layer 3]
In the present embodiment, the oxygen blocking layer 3 is formed of a transparent conductor thin film. Furthermore, this transparent conductor thin film is formed simultaneously with the same material as the transparent conductor thin film which comprises the transparent electrode 5 for touchscreens.

[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 (Indium Gallium Zinc Oxide, Indium Gallium Zinc Oxide), or the like can be used that is formed by patterning a transparent conductor thin film.
In the present embodiment, specifically, ITO is used as the transparent conductor thin film.

  In the present embodiment, the transparent conductor thin film used for the transparent electrode 5 is made of the same material as the oxygen blocking layer 3. That is, the pattern of the transparent electrode 5 includes a pattern that can be simultaneously formed on the surface that can be formed simultaneously with the oxygen blocking layer 3, and the transparent electrode 5 and the oxygen in the pattern portion that can be formed simultaneously on the surface that can be formed simultaneously. Since the barrier layer 3 is formed at the same time, the oxygen barrier layer 3 is formed without an additional step.

  The portion of the transparent electrode 5 corresponding to the bridge portion 5aB or the bridge portion 5bB formed on the insulating layer 6 at the intersection 5C is not a pattern formed on the surface that can be formed simultaneously with the oxygen blocking layer 3. In this regard, more specifically, when the stacking order from the translucent substrate 1 side at the intersecting portion 5C is viewed, at the intersecting portion 5C, the bridge lower side portion 5aU (or the bridge lower side portion 5bU), the insulating layer 6, In contrast to the bridge portion 5bB (or the bridge portion 5aB), in the opaque region A2, the order of lamination from the translucent substrate 1 side is the colored resin layer 2a that becomes the light shielding layer 2, the insulating layer 6, and the transparent layer. It becomes the lead-out part of the electrode 5 or the wiring 7. Therefore, when the insulating layer 6 is used as a reference, the bridge lower side portion 5aU (or the bridge lower side portion 5bU) and the oxygen blocking layer 3 that are closer to the light transmissive substrate 1 than the insulating layer 6 are as in the present embodiment. If it can be formed of the same material, the layers can be formed simultaneously on the surfaces that can be formed simultaneously.

[Insulating layer 6]
In the present embodiment, the touch panel function is integrated, and the touch panel wiring 7 and the transparent electrode 5 are also provided on the first surface S1 on which the light shielding layer 2 is formed. A part (extraction portion) of the transparent electrode 5 connected to the light shielding layer 2 is formed on the surface of the light shielding layer 2. That is, the insulating layer 6 is formed on the surface of the oxygen blocking layer 3 that covers the colored resin layer 2 a that constitutes the light shielding layer 2. In the present embodiment, since the oxygen blocking layer 3 is made of a transparent conductor thin film and is conductive, the wiring 7 and the take-out portion of the transparent electrode 5 connected to the surface of the oxygen blocking layer 3 are in direct contact with each other. If formed, the insulation necessary for these conductors cannot be secured. For this reason, the lead-out portion of the wiring 7 and the transparent electrode 5 is formed on the oxygen blocking layer 3 and on the side surface with the insulating layer 6 interposed therebetween.

The oxygen blocking layer 3 may basically be either conductive or insulating. However, when the touch panel wiring 7 and the transparent electrode 5 are formed so as to be in contact with the surface of the oxygen blocking layer 3, the wiring 7 and the transparent electrode 5 are insulated. In the sense that any layer structure can be ensured, it is preferably insulating.
However, when the oxygen blocking layer 3 is conductive, it may be possible to form the oxygen blocking layer 3 without cost by forming it simultaneously with the same material as the transparent electrode 5. In the present embodiment, the oxygen blocking layer 3 constitutes the transparent electrode 5 as a conductive layer, taking advantage of the fact that the insulating layer 6 at the intersection 5C can be simultaneously formed on the surface of the oxygen blocking layer 3 with the same material. This is an example in which the transparent conductor thin film is formed simultaneously with the same material.

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 colored resin layer 2a. 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.
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.

In the present embodiment, after the colored resin layer 2a as the light shielding layer 2 of the translucent substrate 1 and the oxygen blocking layer 3 are formed in order to ensure insulation between the wirings 7 formed in the opaque region A2. An insulating layer 6 is formed immediately above the oxygen blocking layer 3 on the surface of the first surface S1, which is one of the surfaces. That is, the insulating layer 6 is formed in contact with the surface of the oxygen blocking layer 3 after the oxygen blocking layer 3 is formed.
In this embodiment, the insulating layer 6 is formed as a transparent resin layer, and this transparent resin layer is the same as the colored resin layer 2a by a transparent resin composition excluding the colored pigment contained in the colored resin layer 2a. Is formed.

[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.

[Effect in this embodiment]
In the present embodiment, the oxygen blocking layer 3 can improve the light resistance of the colored resin layer 2a using the photosensitive resin constituting the light shielding layer 2.
Furthermore, it also has a touch panel function, which can contribute to reducing the number of parts and reducing the weight.
Moreover, since the oxygen blocking layer 3 and the oxygen blocking layer 3 for improving light resistance are conductive, the insulating layer 6 on the oxygen blocking layer 3 is the transparent electrode 5 for the touch panel. The insulating layer 6 is simultaneously formed with the same material as the insulating layer 6 at the intersection 5C of the transparent electrode 5 for the touch panel. For this reason, the oxygen barrier layer 3 and the insulating layer 6 on the oxygen barrier layer 3 can be formed only by changing the pattern at the time of pattern formation without increasing the number of steps. As a result, light resistance can be improved without cost.

<< Third Embodiment: Touch Panel Integration and Oxygen Barrier Layer 3 Using its Conductive Metal Layer >>
This embodiment is also an example having a transparent electrode 5 and wiring 7 for a touch panel. However, the transparent electrode 5 includes a mesh electrode in which transparency is ensured by forming a conductive metal layer whose layer itself is opaque in a mesh shape.
FIG. 13 is a plan view showing the periphery of the intersection 5C of the transparent electrode 5, FIG. 14 is a schematic partial enlarged sectional view, and a partial enlarged plan view showing an example of the pattern shape of the mesh electrode of the transparent electrode 5 in FIG. Referring to the partial enlarged cross-sectional view around the intersection 5C of the transparent electrode 5 in FIG. 16 and the schematic partial enlarged cross-sectional view in FIG. 17, the third embodiment of the front protective plate 10 for a display device according to the present invention. A form example will be described. The transparent electrode 5 is an example formed for a projected capacitive touch panel.

This embodiment is the same as the second embodiment except for the following points. Therefore, the description of the same part is omitted.
a) The oxygen barrier layer 3 is formed of an opaque conductive metal layer.
b) The transparent electrode 5 includes a mesh electrode in which transparency is ensured by forming an opaque conductive metal layer in a mesh shape.
c) A conductive metal layer to be the oxygen blocking layer 3 is formed of the same material as the transparent electrode 5 at the same time.
d) The transparent electrode 5 and the wiring 7 are made of the same material, and a part of the transparent electrode 5 and the wiring 7 are formed simultaneously.

[Structure of intersection 5C]
Also in the present embodiment, as in the second embodiment, the intersecting portion 5C can be formed with two types of structures.
FIG. 13 is a partially enlarged plan view showing the periphery of the intersecting portion 5C of the transparent electrode 5, which corresponds to FIG. 8C in the second embodiment in which the transparent electrode 5 is formed of a transparent conductor thin film. FIG.
Further, the schematic partial enlarged cross-sectional view of FIG. 14 is a cross-sectional view corresponding to FIG. 7 in the second embodiment.
The order of forming the oxygen blocking layer 3 and the transparent electrode 5 is the same as in the second embodiment except for the wiring 7. Therefore, here, the wiring 7 will be described.

In the present embodiment, the wiring 7 is made of the same material as the transparent electrode 5 and is formed simultaneously with a part of the transparent electrode 5. Specifically, referring to FIG. 8 of the second embodiment, in the second embodiment,
“3) Next, as shown in FIG. 8C, all of the first electrodes 5 a except the bridge lower portion 5 a U and all of the second electrodes 5 b including the bridge portion 5 b B are formed simultaneously with the same material. . "
The wiring 7 is also formed at the same time. Therefore, after the next “4), although not shown, the wiring 7 in the opaque region A2 is formed.”
This step becomes unnecessary.

(Reverse structure intersection 5C)
The laminated structure of the intersecting portion 5C can be reverse to that shown in FIGS. This is shown in FIGS. 16 is a plan view corresponding to FIG. 13, and FIG. 17 is a cross-sectional view corresponding to FIG. Specifically, the reverse structure will be described with reference to FIG. 10 of the second embodiment.
“3) Next, as shown in FIG. 10C, a bridge portion 5aB to be the first connection portion 5aC is formed. At this time, although not shown in the drawing, an extraction portion which is a portion connected to the wiring 7 is formed. The first electrode 5a and the second electrode 5b are also formed simultaneously with the same material as the bridge portion 5aB. "
At the time of this step, the wiring 7 is also formed simultaneously with the same material as the bridge portion 5aB. Therefore, the wiring 7 and the extraction part of the transparent electrode 5 are formed as a continuous layer. Therefore, after the next “4), although not shown, the wiring 7 in the opaque region A2 is formed.”
This step becomes unnecessary.

  The structure of the intersecting portion 5C of the transparent electrode 5 can also be formed in the same manner as in the second embodiment. However, in the present embodiment, the wiring 7 is formed of the same material as the transparent electrode 5 at the same time.

[Transparent electrode 5: Mesh electrode]
As the transparent electrode 5 in the present embodiment, a mesh electrode in which a conductive metal layer whose layer itself is opaque is formed in a mesh shape is used. The portion using the mesh electrode is at least a portion of the first transparent electrode element 5aE and the second transparent electrode element 5bE, as described with reference to the plan views of FIGS. 6B and 6C.
Even an opaque conductive metal layer can ensure transparency (transparency) by forming it as a conductive mesh. For this reason, the width | variety of the line which comprises the mesh pattern of a mesh electrode is 30 micrometers or less from an invisible viewpoint, Preferably it is 10 micrometers or less.

For the opaque conductive metal layer, for example, the materials listed in the wiring 7 can be used. That is, for the opaque conductive layer, for example, metals (including alloys thereof) such as silver, gold, copper, chromium, platinum, aluminum, palladium, and molybdenum can be used. For example, a metal layer of an alloy (also referred to as APC) made of silver, palladium, and copper, which is formed by sputtering and then patterned by photolithography, can be used.
In this embodiment, a silver alloy (also referred to as APC) made of silver, palladium, and copper is used for the conductive metal layer.

  The mesh pattern shape of the mesh electrode is not particularly limited. For example, the mesh pattern shape is a square lattice shape shown in FIG. 15, or a triangular lattice shape, a hexagonal lattice shape (honeycomb shape), a brick pile shape, etc., although not shown.

In the present embodiment, the oxygen blocking layer 3 is formed simultaneously with the same material as the transparent electrode 5, and the wiring 7 is also formed simultaneously with the same material as a part of the transparent electrode 5.
However, in the present invention, the transparent electrode 5 and the wiring 7 may be formed of different materials.

[Wiring 7]
In the present invention, when the wiring 7 is not formed of the same material as that of the transparent electrode 5, a material and a method that do not require pattern formation by photolithography can be adopted for the wiring 7. For example, a conductive ink containing metal particles such as silver, gold, copper, and aluminum and a resin binder can be pattern printed by a printing method such as inkjet printing to form the wiring 7.

[Effect in this embodiment]
In the present embodiment, the oxygen blocking layer 3 can improve the light resistance of the colored resin layer 2a using the photosensitive resin constituting the light shielding layer 2.
Furthermore, it also has a touch panel function, which can contribute to reducing the number of parts and reducing the weight.
Moreover, since the oxygen blocking layer 3 and the oxygen blocking layer 3 for improving light resistance are conductive, the insulating layer 6 on the oxygen blocking layer 3 is the transparent electrode 5 for the touch panel. The insulating layer 6 is simultaneously formed with the same material as the insulating layer 6 at the intersection 5C of the transparent electrode 5 for the touch panel. For this reason, the oxygen barrier layer 3 and the insulating layer 6 on the oxygen barrier layer 3 can be formed only by changing the pattern at the time of pattern formation without increasing the number of steps. As a result, light resistance can be improved without cost.
Furthermore, the wiring 7 and the transparent electrode 5 are simultaneously formed of the same material. As a result, light resistance can be improved without cost.

<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.

[Transparent oxygen barrier layer 3 on the entire surface]
In the above-described embodiment, the oxygen blocking layer 3 is partially formed on the colored resin layer 2a as viewed from the front protective plate 10 for a display device. However, in the present invention, as shown in the partial enlarged cross-sectional view of FIG. 18, the oxygen blocking layer 3 may be formed on the entire surface of the display device front protective plate 10 including the display region A1. In this case, it is formed as a transparent layer in order to ensure transparency in the display area A1.
By thus forming the oxygen blocking layer 3 over the entire surface, patterning of the oxygen blocking layer 3 can be omitted.

[Insulating layer 6 covering conductive oxygen blocking layer 3]
In the embodiment having the transparent electrode 5 for the touch panel and the wiring 7 in the above-described embodiment, when a conductive material such as a transparent conductor thin film is used for the oxygen blocking layer 3, the surface of the oxygen blocking layer 3 Insulating layer 6 was formed.
However, in the present invention, as shown in the partially enlarged cross-sectional view of FIG. 19, the oxygen blocking layer 3 is conductive even when the front protective plate 10 for a display device does not have the transparent electrode 5 or the wiring 7. In some cases, and when this conductivity hinders, an insulating layer 6 may be formed on the surface of the oxygen barrier layer 3. As shown in the figure, when the insulating layer 6 is formed exclusively in the opaque region A2, the insulating layer 6 may be opaque. Further, when the insulating layer 6 is extended to the display area A1, it is transparent.
With such a configuration, the front protective plate 10 for a display device in a state where the transparent electrode 5 and the wiring 7 are not formed is shipped as a product, and the transparent electrode 5 and the wiring 7 are later attached to the oxygen blocking layer 3. A distribution form of the front protective plate 10 for a display device as formed on the surface is possible.

[Multi-layered colored resin layer 2a]
In the above-described embodiment, the colored resin layer 2a has been described as being formed as a so-called “solid layer” having a constant film thickness over the entire opaque region A2. However, the colored resin layer 2a may have a single layer configuration or a multilayer configuration of two or more layers.
When the colored resin layer 2a has a multilayer structure, the layers may be the same color or different color layers. Moreover, you may express the pattern which formed the colored resin layer 2a in pattern shape in the opaque area | region A2.

[Visible information 8]
Like the display device front protective plate 10 illustrated in FIGS. 1 and 9, a product logo mark or the like may be formed as visible information 8 in the opaque region A <b> 2 where the light shielding layer 2 is formed.
In the present invention, the visible information 8 is not essential, but any visible information 8 such as a product logo, an operation explanation character, symbol, or pattern can be provided for the opaque region A2.

The visible information 8 can be provided, for example, in a non-formation part of the colored resin layer 2a in the opaque region A2 so that it can be seen from the front side. The visible information 8 is visible information that is expressed by a color and a shape when the portion of the colored resin layer 2a that is not formed is viewed from the front side.
When the visible information forming layer is viewed from the front side, the visible information forming layer is provided on the non-formed portion of the colored resin layer 2a so that the visible information forming layer is on the back side of the colored resin layer 2a. It can be expressed by the color and shape.
If the position of the visible information forming layer is described with reference to FIG. 20 relating to the infrared transmitting layer 9L described below, for example, a layer structure in which the infrared transmitting layer 9L is replaced with a visible information forming layer in FIG. can do. The visible information forming layer may be a colored transparent layer that can transmit illumination light from the back side. In this sense, the visible information forming layer does not correspond to one configuration of the light shielding layer 2 that is light shielding.

  As the visible information forming layer, a layer such as a metal layer or a colored resin layer having a color or a surface appearance different from that of the colored resin layer 2a can be used. As the metal layer, a metal thin film such as silver or aluminum can be used. As the colored resin layer, a resin composition layer containing a color pigment or metal powder can be used.

[Infrared transmission window 9]
As shown in the plan view of FIG. 6 and the partially enlarged sectional view of FIG. 20, in the present invention, the front protective plate 10 for a display device may have an infrared transmission window 9 in the opaque region A2. By providing the infrared transmission window 9, it can be adapted to an infrared sensor.

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 9L having the optical performance in the infrared transmission window 9 portion. The infrared transmission layer 9L is used when the colored resin layer 2a of the light shielding layer 2 is black, for example, when carbon black is used as a black pigment, it is light-shielding not only for visible light but also for infrared light. Therefore, the infrared transmission layer 9L may be required as a layer made of a material different from that of the colored resin layer 2a.

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, usually 1300 nm or less, is satisfied.
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 9L)
The infrared transmission layer 9L is a constituent layer of the shielding layer 3 together with the colored resin layer 2a.
The infrared transmission layer 9L is usually formed in a similar color to the colored resin layer 2a in order to make the presence of the infrared transmission window 9 inconspicuous. The infrared transmission layer 9L exhibits a light shielding property for visible light and a transparency for infrared light.
The infrared transmission layer 9L does not contain a black pigment such as carbon black, but contains a plurality of types of chromatic color pigments having different colors, for example, red, yellow, and blue, so that a dark color such as black can be obtained. It can be formed as an expressed layer.

The relationship between the infrared transmitting layer 9L and the light shielding layer 2 is a structure formed before the colored resin layer 2a as shown in FIG. 20 (a), and formed after the colored resin layer 2a as shown in FIG. 20 (b). There are configurations to do. In relation to the oxygen blocking layer 3, the infrared transmission layer 9L is formed before the oxygen blocking layer 3 in FIG. 20A, and is formed after the oxygen blocking layer 3 in FIG. It is an example.
In the configuration illustrated in the figure, the oxygen blocking layer 3 is overlapped with the infrared transmission layer 9L, so that it is transparent in visible light and infrared light.

[Oxygen barrier layer 3 formed simultaneously with the same material as the insulating layer 6 at the intersection 5C of the transparent electrode 5]
In the above-described embodiment, in the form having the transparent electrode 5 for the touch panel and the wiring 7, the oxygen blocking layer 3 is the same material as the material constituting the transparent electrode 5, that is, is conductive.
However, in the present invention, as shown in the cross-sectional view of FIG. 21 corresponding to FIG. 7, in the form having the transparent electrode 5 for the touch panel and the wiring 7, the oxygen blocking layer 3 intersects the transparent electrode 5 for the touch panel. It may be formed of the same material as the 5C insulating layer 6. In this case, it is possible to simultaneously form the same material. By simultaneously forming the oxygen blocking layer 3 with the same material as that of the insulating layer 6 at the intersection 5C, the oxygen blocking layer 3 can be formed at the same time as the insulating layer 6 at the intersection 5C without increasing the number of processes. It becomes possible.

[Colored resin layer 3 concealing transparent electrode 5 for touch panel made of conductive metal layer]
In the third embodiment described above, in the display area A1, the transparent electrode 5 for the touch panel includes a mesh electrode in which a conductive metal layer whose layer itself is opaque is formed in a mesh shape, thereby ensuring transparency. It was. However, since the conductive metal layer exhibits a metal reflection color peculiar to metal, this may interfere with display. In such a case, as shown in the cross-sectional view of FIG. 22 corresponding to FIG. 14, the colored resin layer 2a is used as a layer for concealing the conductive metal layer so that it cannot be seen from the front side. It is good to provide also between 1. By making the pattern shape of the colored resin layer 2a the same as the pattern shape of the conductive metal layer, transparency can be ensured by the conductive metal layer or the non-formed portion of the colored resin layer 2a. The light resistance of the colored resin layer 2a formed in the same pattern shape as the transparent electrode 5 made of a conductive metal layer in the display region A1 is covered with the conductive metal layer constituting the transparent electrode 5, Can be improved. However, it is preferable that the colored resin layer 2a for concealing the conductive metal layer is set to be equal to or larger than the line width of the conductive metal layer in consideration of some positional deviation.

  The colored resin layer 2a for concealing the conductive metal layer can be formed of the same material as the colored resin layer 2a in the opaque region A2 and at the same time. In the cross-sectional view of FIG. 22, the stacking order on the translucent substrate 1 at the intersection 5 </ b> C is the first electrode 5 a made of a conductive metal layer formed simultaneously with the same material as the colored resin layer 2 a and the oxygen blocking layer 3. (3) A second electrode 5b made of an insulating layer 6 and a conductive metal layer. On the other hand, the order of lamination on the translucent substrate 1 in the opaque region A2 is also the first electrode 5a composed of the colored resin layer 2a, the oxygen blocking layer 3, the insulating layer 6, and the conductive metal layer. Therefore, the colored resin layer 2a that conceals the conductive metal layer can also be formed without increasing the number of steps and without cost. And the transparent electrode 5 which consists of an electroconductive metal layer can be made not conspicuous.

[Oxygen barrier layer 3 not formed simultaneously with transparent electrode 5 or insulating layer 6 for touch panel]
In the above-described embodiment, in both the second and body 3 embodiments having the transparent electrode 5 for the touch panel and the wiring 7, the oxygen blocking layer 3 is formed of the same material as the transparent electrode 5 for the touch panel.
Here, in FIG. 23, after the oxygen blocking layer 3 is formed, the overcoat layer 4 is formed on the entire surface of the front protective plate 10 for display device, and the transparent electrode 5 and the wiring are in contact with the surface of the overcoat layer 4. 7 is an example.
In the present invention, even if the oxygen blocking layer 3 is formed of the same material as that of the transparent electrode 5 for a touch panel as in the layer structure shown in the sectional view of FIG. 23 corresponding to FIG. 1 or FIG. When the structure cannot be formed, the oxygen blocking layer 3 may not be formed simultaneously with the transparent electrode 5.
Similarly, in the layer structure shown in FIG. 23, the oxygen blocking layer 3 is formed simultaneously with the insulating layer 6 even if the oxygen blocking layer 3 is formed of the same material as the insulating layer 6 in the layer structure shown in FIG. It does not have to be done.
With this configuration, the degree of freedom in product design can be increased.

[Overcoat layer 4]
In the modification of the first embodiment shown in FIG. 5, the overcoat layer 4 is formed between the colored resin layer 2 a and the oxygen blocking layer 3. The overcoat layer 4 is not formed in the display area A1 except for the inside of the outer peripheral portion of the display area A1, and is partially formed as the entire front protective plate 10 for display device.
However, in the present invention, like the overcoat layer 4 and the overcoat layer 4a shown in FIG. 23, the display device front protective plate 10 may be formed on the entire surface. The overcoat layer 4a is formed on the entire surface after the transparent electrode 5 and the wiring 7 are formed. The overcoat layer 4 and the overcoat layer 4a when formed on the entire surface are both insulating and transparent. The overcoat layer 4a 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.
With such a configuration, the reliability can be improved.

[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.

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.

[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 first embodiment of a display device according to 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.
In addition, the light-shielding layer 2 of the front protective plate 10 for display device has a colored resin layer 2a that has improved light resistance, 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.

[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, illustrated in FIG. 6, FIG. 7, FIG. 12, FIG. It is in the form.

  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.
In addition, the light-shielding layer 2 of the front protective plate 10 for display device has a colored resin layer 2a that has improved light resistance, and can be a highly reliable product.
Furthermore, in the form in which the oxygen blocking layer 3 is formed simultaneously with the same material as the transparent electrode 5, the insulating layer 6 on the oxygen blocking layer 3 is also the same as the insulating layer 6 at the intersection 5 </ b> C of the transparent electrode 5. In the form that is formed simultaneously with the material, the light resistance of the colored resin layer 2a can be improved without increasing the number of steps and without cost.
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 protective 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]
In the display device 100 according to the embodiment illustrated in FIG. 24, the display device front protective plate 10 and the display panel 30 have a gap and an air layer, but in the present invention, Between the front protective plate 10 for display device and the display panel 30, the space between the constituent members 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 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 Oxygen blocking layer 4, 4a Overcoat layer 5 Transparent electrode 5a 1st electrode 5aB Bridge part 5aC 1st connection part 5aE 1st transparent electrode element 5aU Bridge lower part 5b 1st 2 electrodes 5bB Bridge portion 5bC Second connection portion 5bE Second transparent electrode element 5bU Bridge lower side portion 5C Intersection portion 6 Insulating layer 7 Wiring 8 Visible information 9 Infrared transmission window 9L Infrared transmission layer 10 Front protective plate 20 for display device Touch panel 30 Display panel 40 Conventional front protective plate for display device 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 translucent substrate;
A light-shielding layer that is provided in the opaque region on one surface of the translucent substrate and includes a colored resin layer in a resin binder using a cured product of a photosensitive resin as a constituent layer;
An oxygen barrier layer provided on the one surface so as to cover the colored resin layer;
Opaque wiring formed on the surface of the oxygen barrier layer;
Having at least
Front protective plate for display devices. A transparent electrode for a touch panel provided on the one surface so as to extend from the display region to a portion of the opaque region having the light shielding layer;
An insulating layer on the one surface and provided on the oxygen barrier layer;
In the insulating layer a on the one surface, and the opaque lines provided so as to be electrically connected to portions of the light shielding layer to said transparent electrode,
Have
The oxygen barrier layer and the transparent electrode are formed of a transparent conductor thin film of the same material,
The front protective plate for a display device according to claim 1. A transparent electrode for a touch panel provided on the one surface so as to extend from the display region to a portion of the opaque region having the light shielding layer;
An insulating layer on the one surface and provided on the oxygen barrier layer;
In the insulating layer a on the one surface, and the opaque lines provided so as to be electrically connected to portions of the light shielding layer to said transparent electrode,
Have
The oxygen blocking layer and the transparent electrode are formed of a conductive metal layer in which the same material layer itself is opaque,
The transparent electrode includes a mesh electrode that ensures transparency by being formed in a mesh shape at least in the display region.
The front protective plate for a display device according to claim 1.   A display device comprising the front protective plate for a display device according to claim 1 and a display panel.

Images