JP6323594B2 - 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 recent years, touch panels used in combination with display panels are rapidly spreading in various display devices such as smartphones and tablet PCs (personal computers).

  FIG. 12 is a diagram schematically illustrating an example of the display device 200 including the touch panel 20. 12A is an exploded plan view, and the cross-sectional view of FIG. 12B is the exploded plan view of FIG. 12A when the front protection plate 40 for a display device is cut along the line CC. It is sectional drawing of only the front surface protection board 40 for display apparatuses. The touch panel 20 is disposed on the front side (the front side in the drawing) that is the light output side of the display light from the display panel 30 with respect to the display panel 30. Further, in order to protect the touch panel 20, a front protective plate for display device 40 is disposed on the front side of the touch panel 20, which is the side from which the display light from the display panel 30 passes through the touch panel 20 and emits light (Patent Literature). 1, Patent Document 2, Patent Document 3).

  As shown in FIG. 12, the front protective plate 40 for a display device is usually an opaque region A2 in the outer periphery of the display region A1, as illustrated in FIG. A light shielding layer 42 is formed. The light shielding layer 42 is usually formed as a colored resin layer containing a color pigment in a resin binder, and the color of the light shielding layer 42 is usually black from the viewpoint of light shielding properties. The opaque region A2 prevents the touch panel 20 disposed on the back side of the front protective plate 40 for display device from seeing the wiring 6 and connectors on the outer peripheral portion so as not to impair the appearance. In the opaque region A2, visible information 8 such as a product logo, an infrared transmission window, and a notification window indicating the state of the device are also provided as appropriate. The opaque region A2 is provided with an additional front protective plate 40 for the display device. It is also a decoration part.

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

JP 2009-193587 A Utility Model Registration No. 3153971 JP 2008-266473 A (FIG. 2)

However, recently, in order to further increase the commercial value such as design, colors other than black have been required for the color of the light shielding layer 42. For example, white color designs such as pure white and ivory colors have been required. Has come to be seen.
As for the white color, the color pigment used for the colored resin layer constituting the light shielding layer 42 is changed to a black pigment such as carbon black instead of a black pigment, and the white color mainly corresponds to the color of the white color. If a chromatic coloring pigment is used in combination, it can be expressed once. Therefore, as the colored resin composition for forming the colored resin layer, a colored resin composition containing a plurality of colored pigments mainly composed of a white pigment and used in combination with a colored pigment other than a white pigment and a resin binder is used for the light shielding layer 42. Adjustment may be made according to the color.

However, if the color design is not a white color but a dark color such as blue, it is difficult to notice even if the color of the formed light shielding layer 42 is slightly deviated from the target color. In the case of, the color shift is conspicuous. For this reason, in order to stably express a white color, coating, printing, heat drying, exposure, development, heat treatment, resin for each color of the colored resin composition required for the number of colors to be expressed Regarding various necessary manufacturing processes such as curing, it is necessary to determine the processing conditions in advance. In particular, when a colored resin layer is formed by a photolithographic method using a photosensitive resin as a resin binder in terms of excellent pattern accuracy, the steps of exposure, development, heat treatment, etc. are also required. It was.
As described above, it has been desired that the light-shielding layer 42 using the colored resin layer can stably express a white color design and can efficiently produce various white color designs.

  That is, an object of the present invention is to display a configuration in which a white color design of various colors can be stably expressed by a light-shielding layer in an opaque region, and a white color design of various colors can be efficiently manufactured. An object is to provide a front protective plate for a device and a display device including the same.

In the present invention, the front protective plate for a display device and the display device are configured as follows.
(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 provided in the opaque region on any one of the first surface of the translucent substrate and the second surface opposite to the first surface;
The light-shielding layer exhibits a white color by having a white resin layer containing at least a white pigment in a resin binder,
The light-shielding layer further includes a color adjustment layer of a color different from the color of the white resin layer so as to overlap the white resin layer.
Front protective plate for display devices.
(2) The light shielding layer has a backing layer having a greater light shielding property than the white resin layer on the surface of the white resin layer,
Having the color adjustment layer between the backing layer and the white resin layer;
(1) The front protective plate for a display device.
(3) The light shielding layer has a backing layer having a greater light shielding property than the white resin layer on the surface of the white resin layer,
The backing layer also serves as the color adjustment layer,
(1) The front protective plate for a display device.
(4) A transparent electrode for a touch panel provided on the one surface of the translucent substrate so as to extend from the display region to the surface of the light shielding layer in the opaque region;
An opaque wiring provided on the surface of the light shielding layer and electrically connected to the transparent electrode;
Having
The front protective plate for a display device according to any one of (1) to (3).
(5) a display panel;
The front protective plate for a display device according to any one of (1) to (4), which is arranged on the front side from which display light from the display panel is emitted;
Comprising at least
Display device.

  According to the present invention, for a display device having a configuration in which a white color design of various colors can be stably expressed by a light-shielding layer in an opaque region and a white color design of various colors can be efficiently manufactured. A front protective plate and a display device including the front protective plate can be provided.

The top view (a) explaining one Embodiment of the front-surface protection plate for display apparatuses by this invention, and sectional drawing (b) in CC line in a top view. The top view explaining the modification (white type resin layer is a multilayer structure) of the front surface protection plate for display apparatuses by this invention. The top view explaining the deformation | transformation form (a backing layer serves as a color adjustment layer also) of the front surface protection plate for display apparatuses by this invention. The top view explaining an example of the deformation | transformation form (insulation layer on a light shielding layer) of the front surface protection plate for display apparatuses by this invention. The top view explaining another embodiment (touch panel function integration) of the front-surface protection plate for display apparatuses by this invention. The partial expanded sectional view explaining embodiment of FIG. Sectional drawing explaining an example of the cross | intersection part of the transparent electrode of FIG. Sectional drawing explaining an example of the deformation | transformation form (overcoat layer) of the front surface protection plate for display apparatuses by this invention. Sectional drawing which illustrates typically one Embodiment (touch-panel transparent electrode integration) of the display apparatus by this invention. Sectional drawing which illustrates typically another embodiment (touch panel transparent electrode partial integration) of the display apparatus by this invention. Sectional drawing which illustrates typically another embodiment (touch panel separate body) of the display apparatus by this invention. 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.
Any one of the “first surface” and the “second surface” is the “front side”, and which surface is the “front side” is arbitrary.
Originally, “one side” and “the other side” which is the opposite side are either “front side” and which side is the “front side”. In the present invention, the surface of the translucent substrate that always has the light shielding layer is referred to as “one surface”, and this one surface is used as the back surface. Further, in the present invention, the surface that becomes the “front side” will be referred to as the “first surface”, and the surface that will become the “back side” will be described as the “second surface”. Therefore, the “one surface” or “back side” surface having the light shielding layer is the “second surface”, and the “other surface” or “front side” surface is the “first surface”.
The meaning of “white color” will be described later in the light shielding layer column.

[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 FIG. FIG. 1A is a plan view, and FIG. 1B is a cross-sectional view.

  As shown in the plan view of FIG. 1A, the front protective plate 10 for a display device according to the embodiment shown in FIG. 1 is provided in the central display area A1 and the outer peripheral portion of the display area A1. And an opaque region A2. The cross-sectional view of FIG. 1B is a cross-sectional view taken along line CC in the plan view of FIG. As shown in the cross-sectional view of FIG. 1B, the front protective plate 10 for a display device according to this embodiment includes a translucent substrate 1, a first surface S1 of the translucent substrate 1, and a first surface S1. The light shielding layer 2 provided in the opaque region A2 is provided on the second surface S2 of the two surfaces of the second surface S2 opposite to the first surface S2.

  In the front protective plate 10 for a display device in the present embodiment, the light shielding layer 2 is provided on the second surface S2 of the translucent substrate 1, and this second surface S2 is the back side, in other words, the second surface S2 is Assuming that the first surface S1 is used toward the viewer V side of the display of the display panel 30 toward the touch panel 20 or the display panel 30 side indicated by the phantom line of the two-point difference line in FIG. It is a form.

  In this embodiment, the light shielding layer 2 is composed of a white resin layer 2w, a color adjustment layer 2a, and a backing layer 2b in this order from the translucent substrate 1 side.

In the present embodiment, the white resin layer 2w includes a white pigment in a resin binder and exhibits a white color. In the present embodiment, the white resin layer 2w does not include a color pigment for coloring a chromatic color other than a white pigment and a black pigment for reducing brightness. In the present embodiment, the white resin layer 2w is formed as a layer that increases the reflectance to increase the brightness and bears white as the basic color of the white color design.
In this embodiment, the color adjustment layer 2a contains a blue pigment in a resin binder and exhibits a blue color.
The backing layer 2b is basically a layer that is formed on the far side of the white resin layer 2w from the translucent substrate 1, that is, on the back side, and has a greater light shielding property than the white resin layer 2w. In this embodiment, the backing layer 2b includes a black pigment in a resin binder and exhibits a black color.
In the present invention, the backing layer 2b can be omitted if the white resin layer 2w and the color adjustment layer 2a have sufficient light shielding properties.

In the present embodiment, the light-shielding layer 2 having such a configuration allows light incident on the front protective plate 10 for display device from the front side to enter the white resin layer 2w and further exhibit a blue color adjustment layer. The blue light that has reached 2a and partially reflected there returns to the white resin layer 2w again and enters from the front side of the front protective plate 10 for display device, so that the color of the white resin layer 2w In addition, the color of the color adjustment layer 2a is added, and the light shielding layer 2 as a whole exhibits a color in which the color of the white resin layer 2w and the color of the color adjustment layer 2a are combined. In the present embodiment, a very light blueish white is expressed as a white color.
Moreover, as a result of performing white color expression not only in the white resin layer 2w but also in both the white resin layer 2w and the color adjustment layer 2a, the color adjustment layer 2a is increased by one layer, but the manufacturing process increases. When dealing with white color designs of various colors, the white resin layer 2w, which tends to be thick and has severe manufacturing conditions, has the same composition and is thicker than the white resin layer 2w. Since it is possible to set the manufacturing conditions for the composition corresponding to the color expressing only the color adjustment layer 2a that can be thinned, it is possible to efficiently manufacture various colors, and stable color expression is possible. .
Furthermore, in this embodiment, the light shielding property of the light shielding layer 2 is also ensured by the backing layer 2b.

  As described above, in the front protective plate 10 for a display device according to the present embodiment, various colors of white color designs can be stably expressed by the light shielding layer 2 in the opaque region A2, and various colors of white systems are used. The effect that the thing of the color design of this can be manufactured efficiently is acquired.

  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
When the display area A1 is applied to the display panel 30 indicated by the phantom line of the two-dot chain line in the cross-sectional view of FIG. 1B, the display panel 30 displays through the front protection plate 10 for the display device. It is an area where the contents to be displayed can be displayed. The opaque region A2 is a touch panel when the wiring, connector, etc., which the display panel 30 has on the outer peripheral portion is hidden, or when applied to the touch panel 20 indicated by a two-dot chain line imaginary line in the cross-sectional view of FIG. Reference numeral 20 denotes an area for hiding opaque wiring, connectors, and the like that are provided on the outer periphery thereof. Further, the opaque area A2 is an area that also serves as a decoration portion by visible information 8 such as a color expressed by the logo, 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 such as soda-lime glass, borosilicate glass, quartz glass, or aluminosilicate glass can be used. In particular, as a 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, an acrylic resin, a polycarbonate resin, a cycloolefin resin, a polyester resin, or the like can be used as the resin. By using a resin for the light-transmitting substrate 1, the weight can be reduced and flexibility can be provided.
For the light-transmitting substrate 1, a laminate of glass and resin can also be used. By using a laminated body of glass and resin for the light-transmitting substrate 1, both glass characteristics and resin characteristics can be provided.

[Light shielding layer 2]
The light shielding layer 2 in the embodiment illustrated in FIG. 1 is formed in a portion of the opaque region A2 of the second surface S2 on the back side that is the touch panel 20 and the display panel 30 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 second surface S2 as one of the first surface S1 and the second surface S2 of the translucent substrate 1.
The light-shielding layer 2 is a wiring or control circuit that the touch panel 20 has on its outer peripheral portion with respect to its central position detection region, or a wiring or control that the display panel 30 has on its outer peripheral portion with respect to its central display region The display device using the touch panel 20 or the display panel 30 has a function of hiding the circuit and the like so that the appearance is not impaired.

  The light-shielding property of the light-shielding layer 2 depends on required specifications and expression color, but in terms of transmittance, it is at most 1% or less (optical density OD2.0 or more), preferably transmittance is 0.1% or less (optical) Density OD3.0 or more), and more preferably 0.01% or less (optical density OD4.0 or more) in terms of transmittance.

The light shielding layer 2 has a function as a decorative layer for improving the appearance design of the front protective plate 10 for a display device as well as a light shielding property for hiding unnecessary components.
The light shielding layer 2 represents a white color design in the present invention. In the present embodiment, the light shielding layer 2 expresses a color design of a white color (a color like pastel blue) that is extremely thin and bluish as a white color design.

In the present invention, the light shielding layer 2 expresses a white color, for example, a white color with a chromatic color, or an achromatic pure white or a very light grayish white color.
In the present invention, the light-shielding layer 2 stably represents such various white colors and can efficiently manufacture various white color designs. In order to be the plate 10, in addition to the white resin layer 2w, the color adjustment layer 2a is also provided as an essential layer.
In the present embodiment, the white resin layer 2w has a positional relationship in which the white resin layer 2w is positioned on the front side of the color adjustment layer 2a. Therefore, the white resin layer 2w is transparent to some extent that reflects the color of the color adjustment layer 2a. Have sex. In this way, the light shielding layer 2 can exhibit a color in which at least the color of the color adjustment layer 2a and the color of the white resin layer 2w are combined. Therefore, in the present embodiment, the white resin layer 2w itself does not have a light shielding property of, for example, an optical density OD4.0 or more.

  Hereinafter, the white color, the white resin layer 2w, the color adjustment layer 2a, and the backing layer 2b will be described.

[What is a white color?]
In the present invention, the light shielding layer 2 has a white color in addition to pure white (pure white), yellowish white which is yellowish white, ivory, beige and reddish white which is reddish white (light Pink), yellowish white as yellowish white, bluish white as blue white, green white as green white, purple white as purple white, brown white as brown white, blackish white Also included are chromatic and whitish colors, and achromatic and whitish colors, such as white gray (light gray), silvery white that is silvery white, and 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 may 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.

[White resin layer 2w]
The white resin layer 2w is formed as a layer containing at least a white pigment in a resin binder as a coloring pigment for expressing a white color.
In the present embodiment, the white resin layer 2w uses a white pigment as a color pigment to express a bluish white color in the light shielding layer 2, and a photosensitive resin as a resin binder resin. . Therefore, in the present embodiment, the white resin layer 2w is formed as a layer containing a white pigment as a coloring pigment in a resin binder made of a cured product of a photosensitive resin.

(Thickness)
The thickness of the white resin layer 2w is, for example, 1 to 40 μm, usually 10 to 30 μm. The white resin layer 2w is often less light-shielding than the black color, and in this respect, the white resin layer 2w is preferably thicker. However, if the thickness of the white resin layer 2w is increased and the light shielding property becomes too large, the color of the color adjustment layer 2a formed on the back side of the white resin layer 2w cannot be reflected in the color of the light shielding layer 2. . Therefore, in order for the color of the color adjustment layer 2a formed on the back side of the white resin layer 2w to be reflected in the color of the light shielding layer 2 together with the color of the white resin layer 2w, the thickness of the white resin layer 2w is The light reaches the color adjustment layer 2a on the back side from the front side to the back side of the white resin layer 2w, is reflected again by the color adjustment layer 2a, and is emitted from the front side of the white resin layer 2w. The thickness is set to be equal to or less than the thickness having transparency reflected in the color. As a result, the light shielding layer 2 exhibits a color in which at least the color of the color adjustment layer 2a and the color of the white resin layer 2w are combined.

However, even if the light shielding property of the white resin layer 2w itself is insufficient or the light shielding property of both the white resin layer 2w and the color adjustment layer 2a is too insufficient, the backing layer 2b can be used together. The backing layer 2b can compensate for the lack of light shielding properties, and the white resin layer 2w can be made thinner accordingly. However, if the thickness of the white resin layer 2w becomes too thin, the fineness of the white design may be lowered. Therefore, the thickness of the white resin layer 2w is appropriately determined according to the color design expressed as the light shielding layer 2. Thickness is set.
In the present embodiment, the thickness of the white resin layer 2w is 30 μm.

(Multi-layer structure)
In the present invention, the white resin layer 2w may have a multilayer structure of two or more layers as exemplified in FIG. The figure shows a case of a two-layer configuration. Also in the present embodiment, the white resin layer 2w has a multilayer structure composed of two layers.
In the drawings according to the present invention, the white resin layer 2w is drawn as a single layer except for FIG. 2 that explicitly illustrates the multilayer structure. In these drawings, the white resin layer 2w is a multiple layer. A layer configuration may also be included.
By forming the white resin layer 2w into a multi-layer structure, even if it is difficult to obtain a target thickness by a single formation, it is possible to obtain a target thickness. For example, as in the present embodiment, the white resin layer 2w is formed by a photolithography method using a white photosensitive resin composition.

  In the present invention, the color adjustment layer 2a other than the white resin layer 2w, the backing layer 2b, and the like may also have a multilayer structure. The notation in each figure of the color adjustment layer 2a and the backing layer 2b is the same as that of the white resin layer 2w, and even if it is drawn as a single layer in the drawing, it may include a multilayer structure.

(Colored pigment: white pigment, etc.)
The color pigment used for the white resin layer 2w uses at least a white pigment in order to express a white color as the light shielding layer 2. As the color pigment, a chromatic color pigment other than a white pigment, an achromatic black pigment, and the like may be used in combination, as will be described later in the color adjustment layer 2a. The color pigments may be used alone, or a plurality of color pigments of the same type or different colors may be used.

  Examples of the white pigment include titanium oxide, silica, talc, kaolin, clay, barium sulfate, and calcium hydroxide.

  The color pigment content depends on the color expressed by the light shielding layer 2 including the white resin layer 2w as an essential constituent layer, but the color pigment relative to the total solid content of the white resin layer 2w including the color pigment and the resin binder. The pigment concentration expressed as a percentage of the amount is, for example, 10 to 80%.

However, in the present invention, in order to more reliably enjoy the effects of the present invention, that is, stable expression and efficient production of various white color designs, the color of the white resin layer 2w is the light shielding layer. According to the white color expressed by 2, it is preferable to keep the color pigment composition constant without changing it. In the present invention, what is changed in accordance with various white colors expressed by the light shielding layer 2 is the combination of the color pigments in the color adjustment layer 2a, and the color of the color adjustment layer 2a can be changed. It is preferable to do this.
Therefore, even if a white pigment and a color pigment other than a white pigment are used in combination with the white resin layer 2w, it is preferable that the blending (type and ratio) of the white pigment and the color pigment used in combination is constant. Furthermore, if the resin binder for forming the white resin layer 2w is also fixed, the white resin composition for forming the white resin layer 2w is the same even if the color expressed by the light shielding layer 2 is different. This is because it is possible to use the same, and the conditions of the formation process of the white resin layer 2w are the same, and efficient and stable production is possible.
In addition, if the type and ratio of the color pigment other than the white pigment used in combination are changed, it is necessary to set various conditions for the formation process of the white resin layer 2w each time. It is because it becomes impossible to respond quickly.

(Resin binder: photosensitive resin, etc.)
The resin of the resin binder is basically not particularly limited, but it is preferable to use a curable resin in terms of durability. When a curable resin is used as the resin of the resin binder, the white resin layer 2w is formed as a layer made of a cured product of the curable resin.
As the curable resin, a photosensitive resin that can be cured by an active energy ray such as an ultraviolet ray, an electron beam, or a visible ray can be used. By using a photosensitive resin, it can be formed by a photolithography method capable of forming a fine pattern.

  Examples of the photosensitive resin include one of photosensitive resins having a photoreactive group such as a reactive vinyl group such as an acrylic resin, an epoxy resin, a polyimide resin, a polyvinyl cinnamate resin, and a cyclized rubber. More than seeds can be used. In the acrylic resin, for example, a photosensitive resin composed of an alkali-soluble resin, a polyfunctional acrylate monomer, a photopolymerization initiator, and other additives can be used as a resin component of the resin binder.

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

  As the photopolymerization initiator, one or more alkylphenone series, oxime ester series, triazine series, titanate series and the like can be used.

  In addition to the above, the resin binder can contain various known additives such as a solvent, a photosensitizer, a dispersant, a surfactant, a stabilizer, and a leveling agent.

(Formation of white resin layer 2w)
The white resin layer 2w can be formed, for example, by a photolithography method using a white photosensitive resin composition containing at least a white pigment and an uncured photosensitive resin as a color pigment.
The method of applying the white photosensitive resin composition on the surface of the translucent substrate 1 is, for example, a known coating method such as a spin coating method, a roll coating method, a die coating method, a spray coating method, or a bead coating method. be able to.
After the white photosensitive resin composition is applied, patterning is performed through a predetermined process such as exposure, development, baking (heat treatment), etc. using a photolithography technique, so that the surface of the translucent substrate 1 is coated. The white resin layer 2w having a predetermined pattern can be formed on the part.
In the present embodiment, the white resin layer 2w is formed by a photolithography method.

In particular, in the present invention, for example, a single layer forming process such as exposure, development, and heat treatment requires a number of sub-processes, and the layer is formed by a method such as a photolithography method that requires conditions for each sub-process. In the case of forming, the light-shielding layer 2 expresses various white colors, but by fixing the color of the white resin layer 2w, the thickness tends to be thick and the condition is severe. Since the condition for one color can be fixedly adopted, the production becomes more efficient, the quality is stabilized, and the white color can be expressed stably.
In addition, the white color is less likely to have a light-shielding property. For this reason, the thickness of the white resin layer 2w is often thicker than that of black, for example, 10 μm or more. It is necessary to pay attention to the disconnection at the time of forming the conductor. In this respect as well, it is important to determine the condition especially for the white color.
For this reason, in the case of the white resin layer 2w formed by the photolithography method, the effects of stable expression and efficient production of various white color designs according to the present invention can be exhibited more remarkably.

  In the present invention, the white resin layer 2w may be formed by a method other than the photolithography method, for example, a printing method such as screen printing or ink jet printing. can get.

[Color adjustment layer 2a]
The color adjustment layer 2a is a layer that exhibits a color different from the color that the white resin layer 2w exhibits, and is a layer that is formed at a position overlapping the white resin layer 2w.
With such a color adjustment layer 2a, the color exhibited by the light-shielding layer 2 can be a color obtained by combining at least the colors of the white resin layer 2w and the color adjustment layer 2a. In order that the color which the light shielding layer 2 exhibits becomes the color which the color of the white resin layer 2w and the color adjustment layer 2a at least combined, in this invention, the white resin layer 2w which comprises the light shielding layer 2, and a color adjustment layer 2a is formed as a layer that exhibits a color in which the color of the white resin layer 2w and the color of the color adjustment layer 2a are combined. More specifically, in this embodiment, the color adjustment layer 2a is formed on the back side of the white resin layer 2w so as to overlap the white resin layer 2w. Therefore, in the form in which the color adjustment layer 2a is located on the back side of the white resin layer 2w, the white resin layer 2w located on the front side of the color adjustment layer 2a has the color of the color adjustment layer 2a set to the color of the light shielding layer 2. It is formed as a layer having a transparency higher than the reflected level.

  On the other hand, since the color adjustment layer 2a is formed on the back side of the white resin layer 2w in this embodiment, the color of the layer formed on the back side of the color adjustment layer 2a (for example, a metallic reflective layer described later) ), The color adjustment layer 2a may be opaque or transparent so that the color of the color adjustment layer 2a is reflected in the color of the light shielding layer 2. However, in the present embodiment, the color adjustment layer 2a is formed as a transparent layer as a result from the viewpoint of the concentration of the color pigment.

(Color pigment)
The color pigment used for the color adjustment layer 2a is not particularly limited. As the color pigment, for example, chromatic color pigments such as a red pigment, a yellow pigment, a blue pigment, a green pigment, and a purple pigment, and an achromatic color pigment such as a white pigment and a black pigment 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 red pigment, for example, a red pigment such as diketopyrrolopyrrole, anthraquinone, or perylene can be used. As the yellow pigment, for example, a yellow pigment such as isoindoline or anthraquinone is used. The blue pigment can be a blue pigment such as copper phthalocyanine or anthraquinone, and the green pigment can be a green pigment such as phthalocyanine or isoindoline. As the purple pigment, a quinacridone-based purple pigment can be used.
Examples of the white pigment include titanium oxide, silica, talc, kaolin, clay, barium sulfate, and calcium hydroxide.
Examples of the black pigment include titanium black (low-order titanium oxide, titanium oxynitride, etc.), carbon black, and the like.

  The content of the color pigment depends on the color expressed by the light shielding layer 2 including the color adjustment layer 2a as an essential constituent layer, but the amount of the color pigment relative to the total solid content of the color adjustment layer 2a including the color pigment and the resin binder. The pigment concentration expressed as a percentage is, for example, 10 to 80%.

(Overlap of color adjustment layer 2a and white resin layer 2w and its application)
The overlap between the color adjustment layer 2a and the white resin layer 2w is from a direction perpendicular to one surface (second surface S2 in the present embodiment) of the translucent substrate 1 on which the light shielding layer 2 is formed. When the light shielding layer 2 is observed, it means that the respective patterns of the color adjustment layer 2a and the white resin layer 2w overlap. In other words, it means the overlap of the respective planar view patterns.

  In the present embodiment, the color adjustment layer 2a and the white resin layer 2w are ignored if a slight mismatch in the pattern contour portion due to the margin setting for the alignment accuracy between the color adjustment layer 2a and the white resin layer 2w is ignored. It is formed with the same pattern. Therefore, the color of the entire area of the white resin layer 2w is adjusted with the color of the color adjustment layer 2a (“adjustment” may be referred to as “modification”). As described above, in the present invention, the white resin layer 2w is basically adjusted with the color of the color adjustment layer 2a in the entire region, but the white resin layer 2w is partially the color adjustment layer 2a. It is not necessary to adjust with the color. For example, the formation of visible information 8 to be described later can be formed as a pattern of a portion where the color adjustment layer 2a does not overlap.

In the present embodiment, the color adjustment layer 2a is located on the back side of the white resin layer 2w and overlaps with each other, but the color of the light shielding layer 2 is different from the color of the color adjustment layer 2a and the white resin layer 2w. The color adjustment layer 2a may be located on the front side of the white resin layer 2w in order to obtain a color combined with the above color. In this invention, the form in which the color adjustment layer 2a is located on the front side of the white resin layer 2w is also included. Of course, in this case, the color adjustment layer 2a must not be opaque, and has a transparency that reflects the color of the white resin layer 2w to express a white color as the light shielding layer 2.
When the white resin layer 2w has a multilayer structure, the color adjustment layer 2a may be positioned between the white resin layers 2w. For example, in the case of the two-layer configuration illustrated in FIG. 2, the color adjustment layer 2a may be sandwiched between the two color adjustment layers 2a. Of course, even in such a configuration, if the light shielding property of the entire white resin layer 2w having a multilayer structure and the light shielding property of the color adjustment layer 2a are insufficient, the backing layer 2b is provided. It is preferable.

(Colors exhibited by the color adjustment layer 2a)
If the color which the color adjustment layer 2a exhibits is different from the color which the white-type resin layer 2w exhibits, there will be no restriction | limiting in particular. Therefore, the color of the color adjustment layer 2a may be chromatic or achromatic, or the color adjustment layer 2a may be pure white unless the white resin layer 2w is pure white.
However, in the present invention in which the light-shielding layer 2 expresses a white color, the white resin layer 2w is usually intended to exhibit pure white using only a white pigment as a coloring pigment. The color exhibited by the color adjustment layer 2 a is set to a color such that the color obtained by combining the color exhibited by the system resin layer 2 w and the color exhibited by the color adjustment layer 2 a becomes a color expressed by the light shielding layer 2.
For this reason, the color exhibited by the color adjustment layer 2a is usually a chromatic color. However, when the light shielding layer 2 expresses an achromatic color such as extremely bright gray, the color of the color adjustment layer 2a may be an achromatic color such as black or gray.

  That the color of the color adjustment layer 2a is different from the color of the white resin layer 2w means that there is a color difference that is higher than the color that can be recognized as a different color by human eyes.

(Measurement method of color)
Evaluation of the color of the color adjustment layer 2a or the white resin layer 2w prevents light reflection after the light passing through the layer returns to the original approach direction, for example, by arranging a black layer adjacent to one surface of the target layer. As a state, it means the color when observed from the other side. The reason why light reflection after passing through the layers is prevented is that if there is a light-reflective layer, the brightness and hue change depending on the light intensity and spectral distribution of the light reflection. A commercially available colorimeter or spectrophotometer can be used for color measurement.

(Setting for complementary color)
The white resin layer 2w is different from a dark color such as black or blue in color, and exhibits a white color. For example, the white resin layer 2w has a heat history such as a high temperature of 200 ° C. or higher during the manufacturing process. The resin binder in 2w may change in quality and turn yellow. For such yellowing, the color of the color adjusting layer 2a is a color complementary to the yellowed color (blue color), for example, as a result of yellowing, there is an achromatic white color to be aimed at. A color that has been changed to a chromatic color can also be returned to an achromatic color (specifically, gray that is not white but has decreased brightness). At this time, if the color density is increased so that the color of the color adjustment layer 2a is reflected more strongly, the yellowed color can be returned to an achromatic color to make it bluish. it can. Even when the target color is a chromatic color and a white color, it is possible to bring the chromatic color changed by yellowing closer to the original target color.
In the present invention, the color adjustment layer 2a is effective as a countermeasure against such yellowing. In particular, when a photosensitive resin is used to form the photolithography method, the white resin layer 2w may be yellow depending on the resin component of the resin binder and various conditions such as exposure, development, and heat treatment of the photolithography method. When it is easy to change, it is more effective.

  As can be seen from the above, the color of the light shielding layer 2 is a color in which the color of the color adjustment layer 2a and the color of the white resin layer 2w are combined. It does not only mean that the hue of the color to be presented is the hue of the color of the color adjustment layer 2a, but the hue of the color of the white resin layer 2w and the hue of the color of the color adjustment layer 2a interact with each other. That means

(Thickness)
The thickness of the color adjustment layer 2a is preferably thinner than the thickness of the white resin layer 2w. Moreover, the thickness of the color adjustment layer 2a is usually formed thinner than the thickness of the white resin layer 2w even when formed as a layer containing a color pigment in the binder resin. This is because the color adjustment layer 2a has a function of modifying the white color of the white resin layer 2w, so that unlike the white resin layer 2w, the thickness can be easily reduced.
By adjusting the thickness of the color adjustment layer 2a to be thinner than the thickness of the white resin layer 2w, the color adjustment layers of different colors can be used when dealing with various white color designs with the color adjustment layer 2a of different colors. This is because the conditions for the formation process for each 2a can be made easier in that the necessity of considering the step difference due to the increase in thickness is reduced as compared with the case of the white resin layer 2w. As a result, it is possible to stably express and efficiently produce various white color designs as compared with the case where the thick white resin layer 2w alone corresponds to various white color designs.

  The thickness of the color adjustment layer 2a is 5 μm or less, preferably 3 μm or less, more preferably 2 μm or less in view of the above points. The thickness of the color adjustment layer 2a is, for example, 0.1 to 5 μm, and usually 0.5 to 3 μm. In the present embodiment, the color adjustment layer 2a is formed with a thickness of 1 μm.

(Light shielding and transparency)
The color adjustment layer 2a is preferably a constituent layer of the light shielding layer 2 and preferably has a large light shielding property. However, the color adjustment function is a minimum essential layer, and the light shielding property is not limited. Therefore, the color adjustment layer 2a may be a transparent layer that exhibits a chromatic color such as blue or an achromatic color such as gray. When the required light shielding property can be ensured by the constituent layers of the light shielding layer 2 other than the color adjustment layer 2a, the color adjustment layer 2a can be a transparent layer. The constituent layers of the light shielding layer 2 other than the color adjustment layer 2a are the white resin layer 2w, the backing layer 2b, and the like, and particularly the backing layer 2b.

(Combined with backing layer 2b)
In the present invention, when the color adjustment layer 2a is formed on the back side of the white resin layer 2w, and the light shielding property of the color adjustment layer 2a is larger than the light shielding property of the white resin layer 2w, this color The adjustment layer 2a can also be referred to as a backing layer 2b with respect to the white resin layer 2w. In other words, such a color adjustment layer 2a can also be used as a backing layer 2b described below.
The color adjustment layer 2a as a layer that also serves as the backing layer 2b includes, for example, a black pigment and a chromatic color pigment in a resin binder, and exhibits a black color having a hue but a black color. However, as a matter of course, the black layer is not the color adjustment layer 2a serving also as the backing layer 2b but the backing layer 2b. This is because if there is no light reflection from the black layer, the brightness and hue of the white resin layer 2w cannot be adjusted by the light intensity and spectral distribution of the light reflection. Therefore, although simple black is excluded from the color of the color adjustment layer 2a, gray is the category of the color adjustment layer 2a even with the same achromatic color.

(Formation of the color adjustment layer 2a)
The formation of the color adjustment layer 2a is basically not particularly limited, but can be formed by the method described in the white resin layer 2w.
In the present embodiment, the color adjustment layer 2a is formed by a photolithography method using a colored photosensitive resin composition containing a blue pigment and an uncured photosensitive resin.

  In the present invention, the color adjustment layer 2a is not formed as a layer containing a color pigment in a resin binder, but may be a material other than resin, for example, metal or metal, as long as the color is different from the color of the white resin layer 2w. May be an inorganic layer made of an inorganic material such as a metal compound.

[Backing layer 2b]
The backing layer 2b is a layer having a greater light shielding property than the white resin layer 2w. In the present invention, the backing layer 2b is preferably provided because only the white resin layer 2w and the color adjustment layer 2a can supplement the light shielding property when the light shielding property of the light shielding layer 2 is insufficient. This is especially true in the case of a white color that is difficult to achieve light shielding unless the thickness is increased.

  As the backing layer 2b, for example, a low-reflection dark color layer or a reflective layer can be used. The dark color layer exhibits black or the like and absorbs light to improve the light shielding property, and the reflective layer reflects light to improve the light shielding property.

As the dark color layer, a black resin layer containing, for example, a black pigment as a coloring pigment in a resin binder can be used. As the coloring pigment, the resin binder, and the forming method, those described in the white resin layer 2w can be appropriately adopted.
In the present embodiment, the backing layer 2b is formed as a black resin layer by a photolithography method in the same manner as the white resin layer 2w.

As the reflective layer, for example, a metallic reflective layer made of a metal film containing silver, aluminum, or the like can be used.
The backing layer 2b is composed of the white resin layer 2w and the color adjustment layer 2a and the backing layer 2b, or when the backing layer 2b is also used as the color adjustment layer 2a, the white resin layer 2w and the backing layer 2b The design of the light shielding layer 2 can also be expressed.
For example, when both the white resin layer 2w and the color adjustment layer 2a have a certain degree of transparency, the reflected light spectrum of the light reaching the backing layer 2b is reflected in the color design of the light shielding layer 2. In this respect, in the form having the reflective layer as the backing layer 2b, the color of the light shielding layer 2 includes a color in which the color of the backing layer 2b is combined with the color of the white resin layer 2w and the color adjustment layer 2a. Become. When the reflective layer is silver and the reflected light spectrum is uniform, the reflectance is improved, the brightness is increased, and the whiteness can be enhanced. This is because color includes lightness in addition to hue and saturation.

The thickness of the backing layer 2b is usually less than the thickness of the white resin layer 2w. By setting the thickness of the backing layer 2b to be less than the thickness of the white resin layer 2w, it is possible to suppress the thickness of the entire light shielding layer 2 that includes the white resin layer 2w and tends to be thick.
The thickness of the backing layer 2b is, for example, 0.5 to 3 μm if it is black in the case of the backing layer 2b made of a resin layer, and other colors such as gray (in this case, it can also be said to be a layer also used as the color adjustment layer 2a). Then, in the case of the backing layer 2b made of a metallic reflective layer, the thickness may be 0.05 to 0.5 μm.

(Metallic reflective layer)
In the present invention, when the backing layer 2b is formed as a reflective layer, a metallic reflective layer can be used for the backing layer 2b. Compared with a resin layer such as a black resin layer, the metallic reflective layer has an advantage that the whiteness of the light shielding layer 2 can be increased by making use of its light reflection characteristics. Hereinafter, the metallic reflective layer will be described.

The metallic reflective layer is a layer that includes one or more metal materials made of metal or a metal compound, exhibits metallic reflection in visible light, and is opaque and has a shielding property larger than that of the white resin layer 2w. A metal layer can be used as the metallic reflective layer.
When the metallic reflective layer is achromatic such as silver or similar to achromatic, the whiteness of the white color design can be enhanced by the reflected light. Therefore, the thickness of the white resin layer 2w can be reduced accordingly.

  “Metallic reflection” means light reflectivity specific to a metal surface. Therefore, even if it is a metal, for example, the thing with a black surface can be made into the white color design which added the blackish to the white color expressed with the light shielding layer 2, and was light grayish. In addition, if a metallic reflective layer having a chromatic color such as blue is used for the metallic reflection, the chromatic color adjusting layer 2a can also be used.

  The metal of the metal material is not particularly limited as long as it is light-reflective and exhibits a metallic color, that is, exhibits metallic reflection and becomes opaque in visible light. For example, metals such as silver, gold, copper, tin, chromium, platinum, aluminum, palladium, molybdenum, nickel, and alloys thereof can be used. As these metal compounds, metal oxides, nitrides, carbides, and the like can be used. As specific examples, a silver alloy (also referred to as APC) made of silver, palladium, and copper, aluminum, chromium, or the like can be used.

As for the reflectivity of the metallic reflective layer, for example, the reflectivity is preferably 70% or more in the sense that the reflectivity is 20% or more and the effect of enhancing the whiteness of the color by reflected light is great.
The reflectance is a numerical value representing the ratio of the total reflected light intensity of the specular reflected light intensity and the diffuse reflected light intensity to the incident light intensity perpendicularly incident on the surface of the metallic reflective layer as a percentage.
In the case of a normal metallic reflective layer such as aluminum or silver, a thickness of about 300 nm and a reflectance of 70% or more can be easily realized.

  The opacity in the metallic reflective layer is preferably 0.1% or less (optical density OD3.0 or more) in terms of total light transmittance, more preferably 0.01% or less (optical density OD4) in terms of total light transmittance. 0 or more), but at a minimum, it means that the total light transmittance is 1% or less (optical density OD2.0 or more).

In order to form the metallic reflective layer in the pattern shape of the backing layer 2b, the metallic reflective layer is once formed as a metal layer and then patterned by photolithography and etching to form a predetermined pattern. be able to.
The metal reflective layer can be formed as a metal layer by a known film forming method. For example, physical vapor deposition methods such as sputtering, vapor deposition, ion plating, chemical vapor deposition such as CVD (Chemical Vapor Deposition), vapor deposition such as coating, or coating methods. .
Even if the thickness of the metallic reflective layer is generally 500 nm, it is possible to ensure sufficient light shielding properties, and 1 μm is not necessary in terms of light shielding properties. For this reason, the thickness of the metallic reflective layer can usually be formed at about 10 to 300 nm.

Metallic reflective layers are usually conductive because they are light reflective or exhibit metallic reflection. Therefore, a metallic reflective layer is provided as the backing layer 2b on the side farthest from the translucent substrate 1 among the constituent layers of the light shielding layer 2, that is, on the back side, and conductors such as wiring and transparent electrodes are provided on the surface of the light shielding layer 2. In that case, it is preferable to provide the insulating layer 3 on the surface of the metallic reflective layer. When the conductor is in contact with the side surface of the metallic reflective layer, it is preferable to provide the insulating layer 3 so as to cover the surface of the metallic reflective layer including the side surface (see FIG. 8 described later).
This is because, for example, when a part of or all of the touch panel function is integrated on the light shielding layer 2 in the opaque region A2 later by providing a conductor such as a wiring or a transparent electrode, the surface of the metallic reflective layer portion. This is because the front protective plate 10 for a display device can be used as an insulating circuit board without short-circuiting conductors such as wiring and transparent electrodes. However, in the present invention, it is not excluded that the metallic reflective layer is non-conductive.

(Metallic resin layer)
In the present invention, a metallic resin layer in which a metallic material is dispersed in a transparent resin binder as particles can be used as the reflective layer as a resin layer similar to the metallic reflective layer. However, the metallic resin layer is often inferior to the metal layer in terms of light shielding properties, and the thickness tends to be thick in order to achieve light shielding properties. For this reason, if the thickness is allowed, a metallic resin layer can be used as the metallic reflective layer.
The metal material constituting the particles of the metal material is not particularly limited as long as it shows metallic reflection. For example, metals such as aluminum, gold, silver, copper, tin, chromium, nickel, and alloys thereof are used. be able to.
As the resin of the transparent resin binder, for example, an acrylic resin, an epoxy resin, a polyester resin, a polyimide resin, or the like can be used.
The metallic resin layer can be formed as a solidified product obtained by drying and removing the solvent by an ink made of a liquid resin composition containing metal material particles, a transparent resin binder, a solvent, and the like.

[Insulating layer 3]
In the present embodiment, the insulating layer 3 is not provided, but in the present invention, the insulating layer 3 may be provided. That is, when the outermost surface of the light shielding layer 2 exhibits conductivity by a metallic reflective layer or the like provided as the backing layer 2b, conductors such as wiring and transparent electrodes are further formed in contact with the outermost surface of the light shielding layer 2. In the case where it is expected, the insulating layer 3 is provided on the surface of the light shielding layer 2 so that the conductor is formed through the insulating layer 3 as in the front protective plate 10 for a display device illustrated in FIG. It is good to form. The insulating layer 3 can prevent short-circuiting between mutually independent conductors.

The insulating layer 3 can also function as a protective layer that prevents deterioration due to oxidation or the like of the metallic reflective layer using a metal material. Therefore, even when the conductor is not formed in contact with the light shielding layer 2 whose outermost surface is conductive, when the outermost surface is expected to be deteriorated due to oxidation like a metallic reflective layer, the insulating layer 3 is used as the light shielding layer 2. It is preferable to provide as a protective layer on the surface.
FIG. 4 is a schematic drawing, and the insulating layer 3 is drawn only on the surface of the light shielding layer 2 including the backing layer 2b, and the side surface of the light shielding layer 2 is not covered. Needless to say, when there is a possibility that the conductive portion on the side surface is in contact with the conductor, or when oxidative degradation or the like is expected on the side surface, the insulating layer 3 includes the light shielding layer 2 including the side surface. It is preferable to coat.

  The insulating layer 3 may be opaque or transparent when formed only in the opaque region A2. When the insulating layer 3 is formed as a transparent layer, the insulating layer 3 can also be formed including the display region A1 in addition to the opaque region A2.

The insulating layer 3 is preferably a curable resin from the viewpoint of heat resistance. For example, an epoxy resin, an acrylic resin, a polyimide resin, or the like can be used. For example, a thermosetting epoxy resin or the like can be used. Can be used.
The insulating layer 3 can be made of a silicon oxide such as silicon oxide, a metal oxide such as chromium oxide, or an inorganic material such as metal nitride or metal carbide.
The insulating layer 3 may be formed by a known method. For example, the insulating layer 3 may be formed by using the resin-based photosensitive resin as described above so as to cover the light shielding layer 2 by photolithography. A pattern can be formed.
The thickness of the insulating layer 3 is, for example, 0.1 to 10 [mu] m, usually 0.5 to 5 [mu] m in consideration of insulating properties.

〔Production method〕
Each layer constituting the front protective plate 10 for a display device of the present embodiment is formed as follows, for example. First, a white resin layer 2w, a color adjustment layer 2a, and a backing layer 2b are formed in this order as a light shielding layer 2 in a region to be an opaque region A2 of the second surface S2 of the translucent substrate 1. Each pattern of the white resin layer 2w, the color adjustment layer 2a, and the backing layer 2b is the same. Thus, the front protective plate 10 for display device is manufactured.
In the present embodiment, more strictly, the color adjustment layer 2a is patterned so as to cover the side surface of the white resin layer 2w, and the backing layer 2b is white without covering the side surface of the color adjustment layer 2a. A pattern is formed so as to cover the surface of the system resin layer 2w.

<< Second Embodiment: Integration of Touch Panel Function >>
A second embodiment of the front protective plate 10 for a display device according to the present invention will be described with reference to FIGS.

The present 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 point where the transparent electrode 4 and the wiring 6 for touch panels are provided.

[Integration of touch panel function]
In the present invention, the front protective plate 10 for a display device may integrate a part or all of the touch panel function. For example, the transparent electrode 4 and the wiring 6 for touch panels may be further provided, and the translucent substrate 1 may also be used as the touch panel substrate. Integration with the touch panel function can be achieved by reducing the number of parts and reducing the thickness even if a part of the functions necessary for the touch panel is integrated. More preferably, they are integrated.

The front protective plate 10 for a display device that integrates part or all of the functions necessary as a touch panel can also be referred to as a “front protective plate for a touch panel integrated display device”. 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 in which a part of functions necessary as a touch panel is integrated can be said to be a touch panel constituent member.
In the case where the transparent electrode 4 for the touch panel is integrated, various position detection methods are known. However, in the position detection method in which the transparent electrode 4 can have two layers, at least one of these, more preferably two layers is used. It is desirable to integrate.

In the present embodiment, as an example of integration of the touch panel function, the transparent electrode 4 is a form example applicable to a capacitance method.
FIG. 5 is a plan view of the front protective plate 10 for a display device according to the present embodiment, FIG. 6 is a partially enlarged sectional view thereof, and FIG. 7 is a sectional view showing an intersecting portion of the transparent electrode 4.

[Transparent electrode 4]
FIG. 5 is a plan view showing a pattern of the transparent electrode 4 in particular.
In the present embodiment, the transparent electrode 4 includes a first transparent electrode 4a and a second transparent electrode 4b that are formed to be insulated from each other.
The first transparent electrode 4a and the second transparent electrode 4b are formed of the same material in the present embodiment. Therefore, in the present specification, when these are collectively referred to, they are also simply referred to as “transparent electrode 4”.

In this embodiment, the touch panel structure which forms both the 1st transparent electrode 4a and the 2nd transparent electrode 4b on the same surface as the transparent electrode 4 for position detection of a touch panel is employ | adopted. That is, the first transparent electrode 4a and the second transparent electrode 4b are formed on the surface of the second surface S2, which is the same surface of the translucent substrate 1.
Various patterns are known for the pattern of the first transparent electrode 4a and the second transparent electrode 4b in the projection capacitive method, and there is no particular limitation. Typically, the plurality of first transparent electrodes 4a extend in the first direction, and the second transparent electrode 4b has a direction intersecting the first direction, usually a direction orthogonal thereto as the second direction. The pattern extends in the second direction. The same applies to the present embodiment as shown in the plan view of FIG.

Fig.7 (a) is a top view which shows the cross | intersection part of the 1st transparent electrode 4a and the 2nd transparent electrode 4b, FIG.7 (b) is sectional drawing in CC line in Fig.7 (a). It is.
Intersections between the first transparent electrode 4 a and the second transparent electrode 4 b are insulated from each other by the interlayer insulating layer 5. The interlayer insulating layer 5 is necessary at least at the intersection of the first transparent electrode 4a and the second transparent electrode 4b.
Only one electrode of the first transparent electrode 4a and the second transparent electrode 4b, in the case of the figure, specifically, only the first transparent electrode 4a, the same surface in a pattern in which the intersection with the other electrode is missing Are formed at the same time, the interlayer insulating layer 5 is formed only at the intersecting portion, and then the connecting portion 4aC is formed as a part of the transparent electrode 4a across the interlayer insulating layer 5 to electrically connect the defective portion. Yes.

  In the cross-sectional view of FIG. 6 (a), since the transparent electrode 4 near the translucent substrate 1 is the first transparent electrode 4a at the intersection, the first transparent electrode 4a is formed after the first transparent electrode 4a is formed. An interlayer insulating layer 5 is formed at the intersection, and a connection portion 4aC is formed across the intersection, thereby completing the second transparent electrode 4b.

  The transparent electrode 4 composed of the first transparent electrode 4a and the second transparent electrode 4b extends from the position detection area in the central display area A1 to a portion overlapping the light shielding layer 2 in the opaque area A2, and is electrically connected to the wiring 6. It is connected to the.

A known material and a forming method can be employed for the transparent electrode 4.
In the present embodiment, the transparent electrode 4 is a transparent conductor film whose layer itself is transparent. Examples of the transparent electrode 4 made of a transparent conductive film include ITO (Indium Tin Oxide), InZnO (Indium Zinc Oxide), AlZnO (Aluminum Zinc Oxide), It is possible to use a patterned transparent conductor film such as InGaZnO (Indium Garium Zinc Oxide).

[Interlayer insulating layer 5]
Known materials and forming methods can be employed for the interlayer insulating layer 5. For example, when a resin is used for the interlayer insulating layer 5, an epoxy resin, an acrylic resin, a polyimide resin, or the like can be used, and specific examples include, for example, these resin-based photosensitive resins. Can be used. In the case of a photosensitive resin, it can be formed using a photolithography method. In addition, an inorganic material such as silicon oxide can be used for the interlayer insulating layer 5.

[Wiring 6]
A known material and formation method can be used for the wiring 6. For example, the wiring 6 can be made of metal (including alloys thereof) such as silver, gold, copper, chromium, platinum, aluminum, palladium, and molybdenum. The wiring 6 can be formed into a pattern by a photolithography method and an etching method after forming a metal layer of a silver alloy (also referred to as APC) made of silver, palladium, and copper by a sputtering method, for example.
For the wiring 6, a conductive layer (referred to as MAM) having a three-layer structure of molybdenum (Mo) / aluminum (Al) / molybdenum (Mo) can also be used.
In the present embodiment, the wiring 6 is formed of a silver alloy (also referred to as APC) made of silver, palladium, and copper using a photolithography method and an etching method as a metal layer.
In the present invention, the method for forming the wiring 6 is not particularly limited, and may be formed by a printing method such as a screen printing method or an ink jet printing method.

〔Production method〕
Each layer constituting the front protective plate 10 for a display device of the present embodiment is formed as follows, for example. First, in the region to be the opaque region A2 of the second surface S2 of the translucent substrate 1, a white resin layer 2w, a color adjustment layer 2a, and a backing layer 2b are formed in this order in a pattern. . Next, the wiring 6 is pattern-formed in the portion of the light shielding layer 2 that is the opaque region A2. Next, the transparent electrode 4 is patterned on the surface of the translucent substrate 1 and the surface of the light shielding layer 2 from the display region A1 to the opaque region A2. At this time, the transparent electrode 4 is patterned so as to be formed in contact with the wiring 6 formed on the surface of the light shielding layer 2. Next, the interlayer insulating layer 5 is patterned at the intersection of the transparent electrode 4, and the connecting portion 4 a C is formed by patterning the defective portion of the transparent electrode 4 across the interlayer insulating layer 5. Complete the whole. In this way, the front protective plate 10 for a display device in which the touch panel function is integrated is manufactured.

[Effect in this embodiment]
By using the front protective plate 10 for a display device having the above-described configuration, various color white designs can be stably expressed by the light-shielding layer 2 in the opaque region A2, and various colors of white-based designs can be expressed. A color design can be efficiently manufactured.
Furthermore, since the touch panel function is integrated, the number of parts is reduced, the number of assembly steps is reduced, and the cost can be reduced.

<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.

[Overcoat layer 7]
In the present invention, the overcoat layer 7 may be formed on the surface of the transparent electrode 4 or the like, for example, as in the display device front protective plate 10 of the modified example illustrated in FIG. The display device front protective plate 10 illustrated in the figure has a display region A1 as an outermost layer on the surface of the second surface S2 of the translucent substrate 1 with respect to the configuration of FIG. In this example, it is formed on the entire surface of the opaque region A2. Further, in the display device front protective plate 10 illustrated in FIG. 6, the overcoat layer 7a as the overcoat layer 7 covers the entire surface of the light shielding layer 2 including the side surfaces of the light shielding layer 2 with respect to the configuration of FIG. This is an example mainly formed in the opaque region A2. The overcoat layer 7a can also be referred to as the insulating layer 3 when it is insulative.

The overcoat layer 7 formed in contact with the transparent electrode 4 or the wiring 6 is insulative. The overcoat layer 7 formed on the wiring 6 does not form a portion where the wiring 6 is connected to the control circuit via a flexible printed circuit board (FPC), and the wiring 6 is exposed.
The overcoat layer 7 can improve insulation and scratch resistance.

  For the overcoat layer 7, known materials and forming methods can be employed. The overcoat layer 7 is preferably a transparent resin, which is also a curable resin in terms of heat resistance. For example, an epoxy resin, an acrylic resin, a polyimide resin, and the like can be used. A thermosetting epoxy resin or the like can be used. In addition, as the curable resin, a photosensitive resin that is cured by ultraviolet rays or the like can be used. In the case of a photosensitive resin, a photolithography method can be used when partially forming. When not partially formed, the overcoat layer 7 can be formed by a coating method.

  In the present invention, the overcoat layer 7 may be provided on the entire surface of the translucent substrate 1 including the opaque region A2 and the display region A1, or may not be provided on the entire surface, according to required specifications. May be.

[Transparent electrode 4: conductive mesh]
In the above-described embodiment, the transparent electrode 4 is formed of a transparent conductor film whose layer itself is transparent.
However, in the present invention, the transparent electrode 4 may be formed of a conductive mesh that is apparently transparent by forming a conductor in which the layer itself is opaque in a mesh shape. The line width of the lines constituting the mesh pattern of the conductive mesh is preferably 30 μm or less, more preferably 10 μm or less from the viewpoint of invisibility.

  The mesh pattern shape of the conductive mesh is not particularly limited. For example, the mesh pattern shape is a square lattice shape, a triangular lattice shape, a hexagonal lattice shape (honeycomb shape), a brick pile shape, or the like.

For the opaque conductor, for example, the materials listed in the wiring 6 can be used. For the opaque conductor, for example, a metal (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 and etching, can be used.
For the opaque conductor, molybdenum (Mo) / aluminum (Al) / molybdenum (Mo) and a three-layered conductive layer (called MAM) can be used.

Taking advantage of the fact that the same material as the wiring 6 can be used as the opaque conductor constituting the conductive mesh, when the conductive mesh is used for the transparent electrode 4, the transparent electrode 4 and the wiring 6 are formed of the same material. May be. Of course, the transparent electrode 4 and the wiring 6 may be formed of different materials.
By forming the transparent electrode 4 and the wiring 6 with the same material, they can be simultaneously formed.
For example, the transparent electrode 4 and the wiring 6 made of a conductive mesh can be formed by a metal layer of an alloy (also referred to as APC) made of silver, palladium, and copper.
By simultaneously forming the transparent electrode 4 and the wiring 6 with the same material, the number of steps can be reduced and the cost can be reduced.

[Use of transparent electrode 4 and wiring 6]
In the said embodiment, the use of the transparent electrode 4 and the wiring 6 was a touch panel.
In a form in which the transparent electrode 4 is used for a touch panel, as a position detection system for the touch panel, in a position detection system in which the transparent electrode 4 has two layers on different surfaces, at least one of them may be provided.
When the transparent electrode 4 is for a touch panel, the position detection method may be a method other than the projected capacitance method, such as a resistive film method.

  In the present invention, when the front protective plate 10 for an electrode-equipped display device is formed with an integrated touch panel function, in addition to the transparent electrode 4 and the wiring 6, for example, a connector, a control, etc. A part of touch panel function such as a circuit, or even all of them may be integrated.

[Opaque area A2: visible information 8]
In the present invention, as shown by a dotted line in FIG. 1A, visible information 8 may be formed in the opaque region A2. The visible information 8 is any visually observable information such as a product logo, an operation explanation character, symbol, or pattern in the opaque area A2. Known materials and forming methods can be employed for the visible information 8.
For example, the visible information 8 can be formed by patterning a colored resin layer as a cured layer of a photosensitive resin containing a color pigment by a photolithography method or the like. Although not shown, the visible information 8 can be provided as a pattern of the non-formation portion of the color adjustment layer 2a provided on the back side of the white resin layer 2w or as a pattern of the backing layer 2b as described above.

[Opaque area A2: Window]
In the present invention, although not shown, a notification window, an infrared transmission window, or the like may be formed in the opaque region A2.

For example, in the case where the display device to which the front protective plate 10 for an electrode-equipped display device is applied is a mobile phone, the notification window indicates various operation states such as an incoming call and a charged state of a battery, flashing light, lighting, and color. This is the part that is notified to the user. Known structures, materials, and forming methods can be employed for the notification window.
Although not shown, the notification window can be provided as a non-forming part of the light shielding layer 2, for example.

In the case of a mobile phone as the display device to which the front protective plate 10 for display device is applied, the infrared transmission window needs to prevent malfunction of the touch panel when the mobile phone is put on the ear during a call. From the viewpoint of extinguishing the display on the display panel and prolonging the battery life, it is provided in the front part of the infrared sensor provided as a human sensor for detecting the approach of human skin. The infrared transmission window has a light shielding property with respect to visible light and a transmission property with respect to infrared light. A well-known structure, material, and formation method can be adopted for the infrared transmission window.
Although not shown, the infrared transmission window can be provided as a non-forming part of the light shielding layer 2, for example.

[C] Display device:
The display device according to the present invention is a display device including at least a display panel and the display device front protective plate 10 disposed on the front side from which display light from the display panel is emitted.
When the display device front protective plate 10 is configured to have part or all of the touch panel function, the display device can have a touch panel function.
Although the display device front protective plate 10 does not have a touch panel function, when the display device has a touch panel function as another component, the display device can have a touch panel function.
When the front protective plate 10 for a display device is configured to have a part of the touch panel function, the display device has a touch panel function by providing the insufficient touch panel function as a separate component. And

<< First embodiment: Front protective plate for display device with integrated touch panel function: Part 1 >>
FIG. 9 shows an embodiment of a display device according to the present invention. A display device 100 shown in FIG. 9 includes a display device front protective plate 10 and a display panel 30 in order from the front side on the viewer V side above the drawing. ing.

[Front protective plate 10 for display device]
The display device front protective plate 10 in the present embodiment has a configuration in which a touch panel function is integrated.
The display device front protective plate 10 is the display device front protective plate 10 according to the present invention described above. More specifically, the front protective plate 10 for a display device further has a wiring 6 and a transparent electrode 4 as a touch panel function. Although not shown, the transparent electrode 4 is shown in FIGS. As in the front protective plate 10 for a display device exemplified in (1), the first transparent electrode 4a and the second transparent electrode 4b are provided.
The display device front protective plate 10 in the present embodiment is, for example, the display device front protective plate 10 of the second embodiment described above. In addition, in this embodiment, other components, such as a control circuit for functioning as a touch panel, can be further provided.

  Therefore, in addition to the transparent electrode 4 and the wiring 6 for the touch panel, the front protective plate 10 for the display device further integrates all the touch panel functions such as a control circuit and a connector for electrically connecting the control circuit and the wiring 6. It is also good. Of course, in this case, when using the display device front protective plate 10 in which all the functions of the touch panel are integrated, it is not necessary to provide the independent touch panel 20, and the display device front protective plate 10, the display panel 30, and the like. The display device is configured to include at least. In this form, the wiring, connector, control circuit, and the like on the outer periphery of the display panel 30 can be hidden.

[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]
With the display device 100 having the above-described configuration, various colors of white color designs can be stably expressed by the light shielding layer 2 in the opaque region A2 in the front protective plate 10 for the display device. It is possible to efficiently produce a white-colored color design.
Furthermore, since the touch panel function is integrated, the number of parts is reduced, the number of assembly steps is reduced, and the cost can be reduced.

«Second embodiment: Front protective plate for display device with integrated touch panel function: Part 2»
The display device 100 according to the second embodiment shown in FIG. 10 includes a display device front protective plate 10, a touch panel constituent member 20a, and a display panel 30 in order from the front side on the viewer V side above the drawing.

In the display device 100 according to the first embodiment illustrated in FIG. 9, the display device front protective plate 10 is a part of the touch panel function, and includes the wiring 6, the first transparent electrode 4 a and the second transparent electrode 4 b of the transparent electrode 4. By providing both, the touch panel function was integrated.
In the present embodiment, one of the first transparent electrode 4a and the second transparent electrode 4b of the transparent electrode 4 is provided with the display device front protective plate 10, and the other is provided with a separate substrate.

As illustrated in FIG. 10, in the display device 100 according to the present embodiment, the display device front protective plate 10 includes the transparent electrode 4 a, and the touch panel constituent member 20 a as another substrate includes the transparent electrode 4 b.
In a form that requires two layers of the first transparent electrode 4a and the second transparent electrode 4b that are insulated from each other, the position detection method of the touch panel by the transparent electrode 4 including the first transparent electrode 4a and the second transparent electrode 4b is: Although a projection type capacitance method may be used, other than the projection type capacitance method may be used.

  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.

  Since the display panel 30 is the same as that of the first embodiment as the display device 100, description thereof is omitted.

[Effect in this embodiment]
With the display device 100 having the above-described configuration, various colors of white color designs can be stably expressed by the light shielding layer 2 in the opaque region A2 in the front protective plate 10 for the display device. It is possible to efficiently produce a white-colored color design.
Furthermore, since the touch panel function is integrated, the number of parts is reduced, the number of assembly steps is reduced, and the cost can be reduced.

<< Third embodiment: Front protective plate for a display device that does not integrate the touch panel function >>
In the present embodiment, the front protective plate 10 for a display device does not include the transparent electrode 4 and the wiring 6 for a touch panel, and the touch panel function is not integrated.
A display device 100 of the present embodiment shown in FIG. 11 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, and further includes a display device front protective plate. 10 and the touch panel 10 are filled with a resin layer 15.

As illustrated in FIG. 11, the display device 100 according to the present embodiment includes a display device front protective plate 10, a touch panel 20, and a display panel 30.
The touch panel 20 schematically shows the transparent electrode 4 and the wiring 6.
Since the display panel 30 is the same as that of the first embodiment of the display device 100, description thereof is omitted.

[Front protective plate 10 for display device]
The display device front protective plate 10 in the present embodiment has a configuration that does not have a touch panel function. For example, it is a thing of 1st Embodiment as an above described front protection plate 10 for display apparatuses.
Although not shown, the display device front protective plate 10 can also include wiring 6 in the opaque region A2. When the front protective plate 10 for a display device is also provided with the wiring 6 as described above, the wiring 6 can be used not for a touch panel but for sensor connection, for example.

[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, the front protection for a display device in which the translucent substrate 1 is used as a substrate. As long as the method is compatible with the plate 10, any of various known position detection type touch panels including a position detection method that does not require a transparent electrode, such as a surface capacitance method, an electromagnetic induction method, and 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.

[Resin layer 15]
The resin layer 15 is a transparent layer, and an adhesive sheet, a solidified layer of the applied resin liquid, or the like can be used. As an adhesive sheet, what consists of an acrylic adhesive, a polyester adhesive, an epoxy adhesive, a silicone adhesive, etc. can be used. As the resin liquid, an acrylic photocurable resin or the like can be used.
Since the light reflection on the surface of the member is reduced by the resin layer 15, the display can be made easier to see.

[Effect in this embodiment]
With the display device 100 having the above-described configuration, various colors of white color designs can be stably expressed by the light shielding layer 2 in the opaque region A2 in the front protective plate 10 for the display device. It is possible to efficiently produce a white-colored color design.
Furthermore, since the touch panel function is laminated and integrated by the resin layer 15, the number of parts is reduced, the number of assembly steps is reduced, and the cost can be reduced.

<< 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.

[Form without touch panel]
The display device 100 in each of the above embodiments has a configuration having a touch panel function. However, in the present invention, the display device 100 may have a configuration not having a touch panel function, such as not having the touch panel 20. .
The effect of the front protective plate 10 for a display device that is incorporated in the display device 100 and does not have a touch panel function can be enjoyed. That is, in the front protective plate 10 for the display device, the white color design of various colors can be stably expressed by the light shielding layer 2 in the opaque region A2, and the white color design of various colors can be efficiently used. It can be well manufactured.

[Interposition of resin layer]
In the display device 100 according to the embodiment illustrated in FIGS. 9 and 10, the display device front protective plate 10 and the display panel 30 have a gap and an air layer. In FIG. 11, the space between the constituent members such as the front protective plate 10 for the display device and the display panel 30 is filled with the resin layer 15 such as an adhesive layer as described in the third embodiment illustrated in FIG. You can do it. Since the light reflection on the surface of the member is reduced by the resin layer 15, the display can be made easier to see.

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

DESCRIPTION OF SYMBOLS 1 Translucent board | substrate 2 Light-shielding layer 2a Color adjustment layer 2b Backing layer 2w White resin layer 3 Insulating layer 4 Transparent electrode 4a 1st transparent electrode 4aC Connection part 4b 2nd transparent electrode 5 Interlayer insulating layer 6 Wiring 7,7a Overcoat Layer 8 Visible information 10 Front protective plate for display device 15 Resin layer 20 Touch panel 20a Touch panel component 30 Display panel 40 Front protective plate for display device 41 Translucent substrate 42 Light shielding layer 100 Display device 200 (Conventional) Display device A1 Display area A2 Opaque area S1 1st surface S2 2nd surface V Observer

Claims (5)

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 provided in the opaque region on any one of the first surface of the translucent substrate and the second surface opposite to the first surface;
The light-shielding layer exhibits a white color by having a white resin layer containing at least a white pigment in a resin binder,
The light-shielding layer further includes a color adjustment layer of a color different from the color of the white resin layer so as to overlap the white resin layer,
The color of the color adjustment layer is a chromatic color.
Front protective plate for display devices. The light shielding layer has a backing layer having a greater light shielding property than the white resin layer on the surface of the white resin layer,
Having the color adjustment layer between the backing layer and the white resin layer;
The front protective plate for a display device according to claim 1. The light shielding layer has a backing layer having a greater light shielding property than the white resin layer on the surface of the white resin layer,
The backing layer also serves as the color adjustment layer,
The front protective plate for a display device according to claim 1. On the one surface of the translucent substrate, a transparent electrode for a touch panel provided to extend from the display region to the surface of the light shielding layer of the opaque region,
An opaque wiring provided on the surface of the light shielding layer and electrically connected to the transparent electrode;
Having
The front protective plate for a display device according to claim 1. A display panel;
The front protective plate for a display device according to any one of claims 1 to 4, which is disposed on the front side from which display light from the display panel is emitted.
Comprising at least
Display device.