JP6016050B2 - Front protective plate for display device and display device - Google Patents

Description

  The present invention relates to a front protective plate for a display device and a display device including the same. In particular, the present invention relates to a front protective plate for a display device having a light shielding layer capable of a metallic design, and a display device including the same.

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

FIG. 7 is a diagram schematically illustrating an example of the display device 200 including the touch panel 20. 7A is an exploded plan view, and the cross-sectional view of FIG. 7B is the exploded plan view of FIG. 7A when the front protective plate 40 for a display device is cut along 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. 7, the front protective plate 40 for a display device normally has an opaque area A2 at the outer periphery of the display area A1, and a light shielding layer 5 is formed in the opaque area A2. The opaque area A2 prevents the touch panel 20 disposed on the back side of the display device front protective plate 40 from seeing the wiring 9 and connectors on the outer peripheral portion so as not to impair the appearance. Further, visible information 6 such as a product logo is appropriately provided in the opaque region A2, and the opaque region A2 is also a decorative portion of the front protective plate 40 for display device.

Between the members of the front protective plate 40 for the display device, the touch panel 20 and the display panel 30, a resin is used without providing a space in order to reduce display light loss due to interface reflection and external light reflection to make the display easier to see. In some cases, the layers are buried in close contact.
In addition, various forms 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 available in order to meet demands for reduction in thickness, weight reduction, number of parts, etc. It has been proposed (Patent Document 1, Patent Document 2).

JP 2009-193587 A Utility Model Registration No. 3153971 JP 2008-266473 A ([0009], [0030], FIG. 4)

By the way, the light shielding layer 5 in the opaque region A2 is usually black from the viewpoint of light shielding properties, but recently, the metallic design such as the metallic luster that the metal surface exhibits is changed by changing the taste. Sometimes it is desired. However, such a metallic design cannot be expressed by the light shielding layer 5 using a black pigment such as carbon black.
Therefore, in order to express a metallic design, the shielding layer 5 is replaced with a black pigment, a colored resin layer containing a colored pigment other than black, such as blue, green, and red, in the resin binder, and the colored resin layer If the metallic pigment layer such as aluminum powder is included in the resin binder at a position viewed through the metallic binder, a metallic design can be expressed. However, with this configuration, the metallic feeling is weak and the thickness of the light shielding layer 5 is further increased, and the problem of the step of the light shielding layer 5 cannot be solved.

  The problem of the step of the light shielding layer 5 is that when the space between the front protective plate 40 for the display device and the touch panel 20 is filled with a resin layer as shown in the cross-sectional view of FIG. The film thickness is, for example, as thick as about 10 μm, so that air tends to remain as residual bubbles G in the stepped portion of the surface generated in the outer contour portion of the light shielding layer 5, thereby reducing the yield. The step is indicated by the symbol D in the figure. 8A shows a state before the display device front protective plate 40 and the touch panel 20 are laminated and integrated as a resin layer 50 with an adhesive sheet interposed therebetween, and FIG. 8B shows these states. Shows a state where the display device front protective plate 40A has been laminated and integrated.

Further, when there is a light shielding layer 5 having a large level difference, when a touch panel function is integrated with the front protective plate 40 for a display device, a transparent electrode made of a conductive thin film for position detection constituting the touch panel is formed by a sputtering method. There is also a problem that it is easy to break at a step portion when formed by, for example.
For this reason, in order to make the member which integrated the touch-panel function, it was necessary to make the level | step difference of the light shielding layer 5 small.

  The problem of the level difference of the light shielding layer 5 can be improved by forming the light shielding layer 5 thinly, for example, to 6 μm or less. For example, the problem of bubbles and disconnection can be improved by forming the light shielding layer 5 not by the screen printing method but by the photolithography method using a photosensitive resin.

  However, even if the light shielding layer 5 is formed using a photosensitive resin by a photolithography method, the colored resin layer of blue, green, red, etc. can be made thin, but if the metallic pigment layer is formed thinly, the metallic feeling is felt. Because it becomes scarce, it cannot be thinned.

  That is, an object of the present invention is to enable a metallic design by a light shielding layer in a front protective plate for a display device. Moreover, it is providing the display apparatus provided with such a front surface protection plate for display apparatuses.

Therefore, in the present invention, a front protective plate for a display device and a display device having the following configuration are provided.
(1) A front protective plate for a display device having a central display area and an opaque area that is provided on an outer periphery of the display area and shields visible light,
A translucent substrate, and 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. And
The light shielding layer, in order from the translucent substrate side, is composed of a colored resin layer and an opaque metal reflective layer made of a metal thin film layer,
The colored resin layer contains a colored pigment in a resin binder made of a cured product of a curable resin, exhibits a chromatic color other than black or gray,
The metal reflective layer has a metal color and is light reflective.
Front protective plate for display devices.
(2) A transparent electrode for detecting the position of the touch panel is further formed on one surface of the translucent substrate after the light shielding layer is formed, and the light shielding layer is removed from the display region. An opaque wiring electrically connected at the light shielding layer portion is formed on the light shielding layer portion via an insulating layer with respect to the transparent electrode extending to the opaque region portion, (1) Front protective plate for display device.
(3) The front protective plate for a display device according to (1), a touch panel, and a display panel, wherein the touch panel has an opaque wiring around a transparent electrode for position detection of the front protective plate for the display device. It is a configuration that is arranged so as to be invisible from the front protective plate side for the display device, overlapping the light shielding layer,
Alternatively, (2) a display device front protective plate having a transparent electrode for a touch panel, and a display panel,
Display device.
(4) The display device according to (3), wherein the display panel is a liquid crystal panel or an electroluminescent panel.

According to the front protective plate for a display device of the present invention, a metallic design can be expressed by a light shielding layer having a colored resin layer and a metal reflective layer.
According to the display device of the present invention, the display device front protective plate included in the display device has the above-described effect.

The top view (a) 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. Sectional drawing explaining the measurement conditions of the color of a light shielding layer. Sectional drawing which illustrates various layer structures of the light shielding layer corresponding to visible information. Sectional drawing explaining another embodiment (with the transparent electrode for touchscreens and wiring) of the front-surface protection plate for display apparatuses by this invention. The top view corresponding to embodiment of FIG. Sectional drawing which illustrates typically one Embodiment 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. Sectional drawing explaining the residual bubble generate | occur | produced when bonding together with an adhesive sheet in the conventional front protective plate for display apparatuses.

    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 a side where display light is emitted from the display panel 30 when the display device front protection plate 10 is used in combination with the display panel 30 in the display device front protection plate 10 or other components. Yes, which means the side on which the display of the display panel 30 is observed.
The “back side” means the side opposite to the “front side”, and means the side of the display device front protective plate 10 or other components on which the display light of the display panel 30 enters.
Any one of the “first surface” and the “second surface” is the “front side”, and which surface is the “front side” is arbitrary. In the present specification, the surface on which the light shielding layer 2 is necessarily provided is referred to as a “second surface”, and this second surface is the back surface.

[B] Front protective plate for display device:
A front protective plate for a display device according to the present invention will be described with reference to an embodiment shown in 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. The light shielding layer 2 is composed of a colored resin layer 2c and an opaque metal reflection layer 2m in this order from the translucent substrate side 1. The colored resin layer 2c contains a color pigment in a resin binder made of a cured product of a photosensitive resin as a curable resin, and exhibits a chromatic or achromatic gray other than black. The metal reflective layer 2m is made of a metal thin film layer, has a metallic color, and is a light reflective layer.
The light-shielding layer 2 is a layer expressing the design of chromatic or achromatic gray as a color other than black in a metallic tone by the colored resin layer 2c and the metal reflective layer 2m. For this reason, the light shielding layer 2 is a decorative layer for decorating the front protective plate 10 for a display device, in addition to the function of hiding the wiring and the like.

  In the present embodiment, the light shielding layer 2 is provided on the second surface S2 of the translucent substrate 1, with the second surface S2 on the back side, in other words, the second surface S2 is on the touch panel 20 or the display panel 30 side. The first surface S <b> 1 is assumed to be used toward the viewer V side of the display on the display panel 30.

  The colored resin layer 2c constituting the light shielding layer 2 is formed by applying a colored photosensitive resin composition containing a colored pigment and an uncured photosensitive resin on the light-transmitting substrate 1, and patterning it by a photolithography method. Thus, the film thickness is 6 μm or less.

The metal reflection layer 2m constituting the light shielding layer 2 is formed on the surface after the colored resin layer 2c is formed, as a metal thin film layer of a metal or a metal compound such as aluminum or chromium, by vacuum evaporation, sputtering, or the like. After forming by vapor phase epitaxy, pattern formation is performed by photolithography to form a film thickness of 500 nm or less.
In the present embodiment, the metal reflecting layer 2m is slightly smaller than the colored resin layer 2c so that it is not exposed and noticeable even if there is some misregistration with respect to the colored resin layer 2c at the time of formation. It is formed in a pattern that fits in the region of the layer 2c.

With the configuration as described above, in the front protective plate 10 for a display device according to the present embodiment, the design expressed by the light shielding layer 2 is a color other than black and has a metallic color with a chromatic color or a gray color. The design can be expressed.
In addition, the metal reflection layer 2m can prevent the light-shielding property from being deteriorated as compared with the case where the light-shielding layer 2 expresses black, which is likely to occur when the light-shielding layer 2 expresses chromatic color or gray. Furthermore, since the colored resin layer 2c is formed with a film thickness of 6 μm or less, it is caused by a step formed at the outer contour portion of the light shielding layer 2, that is, a step at the boundary between the formed portion and the non-formed portion of the light shielding layer 2. The generation of residual bubbles G and the problem of disconnection can also be improved.
Moreover, since the metallic reflective layer 2m for making the metallic tone is not a metallic pigment layer containing a metallic pigment in a resin binder, but a metal thin film layer, the metallic feeling can be maintained even if the film thickness is reduced. Since the light shielding property is ensured, it is possible to express a strong metallic design while improving the step problem.

  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 part by visible information 6 such as a color represented by the logo, a logo or a mark provided as appropriate.

[Translucent substrate 1]
The translucent substrate 1 is transparent to at least visible light, and has a mechanical strength capable of protecting these surfaces against the touch panel 20 and the display panel 30 to which the display device front protective plate 10 is applied. If there is no restriction | limiting in particular, a glass plate can be used typically. In particular, as the glass plate, chemically strengthened glass is preferable in that it has excellent mechanical strength compared to float glass and can be made thinner by that amount. Chemically tempered glass is typically glass whose mechanical properties have been reinforced by a chemical method by exchanging part of ionic species such as by replacing sodium with potassium in the vicinity of the surface of the glass.
Resin can also be used for the translucent substrate 1. For example, as the resin, an acrylic resin, a polycarbonate resin, a cycloolefin resin, a polyester resin, or the like can be used. By using a resin for the light-transmitting substrate 1, the weight can be reduced and flexibility can be provided.

[Light shielding layer 2]
The light shielding layer 2 in the 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. In the display device using the touch panel 20 or the display panel 30, it has a function of hiding a circuit or the like and making it invisible and not impairing the appearance.

  The light-shielding property of the light-shielding layer 2 depends on the required specifications and expression color, but in terms of transmittance, it is 3% or less (1.5 or more at the optical density OD), more preferably 1% or less. (Optical density OD2.0 or higher), more preferably 0.01% or lower (optical density OD4.0 or higher) in transmittance is desirable.

  The light shielding layer 2 has a function of improving the appearance design as well as a light shielding property for hiding unnecessary parts. In other words, in the present invention, it is a color other than black, which is a chromatic or gray color, and also has a function as a decorative layer that expresses a metallic design.

  Therefore, in the present invention, the light-shielding layer 2 includes a colored resin layer 2c for expressing a chromatic color or gray as a color other than black by a cooperative action with the metal reflection layer 2m, and a metal reflection for expressing a metallic tone. Layer 2m. The positional relationship between the colored resin layer 2c and the metal reflective layer 2m is the order of the colored resin layer 2c and the metal reflective layer 2m in this order from the translucent substrate 1 side. As shown in the cross-sectional view of FIG. 1B, this assumes a usage in which the light-transmitting substrate 1 side with respect to the light shielding layer 2 is the observer V side.

  If it is assumed that the light shielding layer 2 side is the viewer V side with respect to the translucent substrate 1, the colored resin layer 2c and the metal reflective layer 2m constituting the light shielding layer 2 are assumed to be used. The positional relationship is the reverse of the above, and the metal reflective layer 2m and the colored resin layer 2c are in this order from the translucent substrate 1 side. However, such a configuration cannot be said to be a preferable configuration because the translucent substrate 1 cannot be used as a protective layer for protecting the light shielding layer 2 from external force or the like. However, in terms of design expression, a colored resin layer 2c and a metal reflective layer 2m are separately provided on the viewer V side of the translucent substrate 1 as a decorative layer having a metallic color expression, in addition to the light shielding layer 2. Providing is not excluded.

[Colored resin layer 2c]
The colored resin layer 2c is a layer containing a color pigment in a resin binder made of a cured product of a curable resin. In the present embodiment, a photosensitive resin is used as the curable resin. For this reason, the colored resin layer 2c is composed of a layer containing a color pigment in a resin binder made of a cured product of a photosensitive resin.
The formation method of the colored resin layer 2c is not particularly limited. For example, a colored photosensitive resin composition containing a colored pigment and an uncured photosensitive resin is applied on the surface of the translucent substrate 1. Then, it can be formed by a so-called photolithography method in which exposure is performed in a predetermined pattern and development is performed. In the present embodiment, the colored resin layer 2c is formed by a photolithography method.
Thus, the colored resin layer 2c formed by photolithography using the photosensitive resin composition can be made thinner than, for example, 6 μm or less, compared with the screen printing method, and the colored resin layer 2c can be formed in the formation portion. It is preferable in that the step of the light shielding layer 2 generated at the boundary between the non-formed portion and the non-formed portion can be reduced. Specifically, the thickness of the colored resin layer 2c formed by photolithography using the photosensitive resin composition can be set to 0.5 to 6 μm.

  The thickness of the metal reflection layer 2m need not exceed 500 nm even if it is thick, and the thickness of the light shielding layer 2 as a whole is hardly affected. Therefore, in order to improve the problem due to the level difference of the light shielding layer 2, it is most effective to reduce the thickness of the colored resin layer 2c. The film thickness of the colored resin layer 2c is adjusted according to the strength of the metallic tone. If it is made thinner, the transparency of the colored resin layer 2c can be increased, and the metallic tone can be made stronger. In addition, transparency of the colored resin layer 2c may reduce the content of the colored pigment in the colored resin layer 2c. However, even if the same level of transparency is achieved, it is more problematic that the colored resin layer 2c is made thinner while the colored pigment content remains constant, rather than reducing the colored pigment content. The improvement effect with respect to is preferable in that it increases.

  In the present invention, the colored resin layer 2c is formed in a pattern in the opaque region A2, but the pattern forming method is not limited to the photolithography method, and if the problem due to the step of the light shielding layer 2 can be improved. For example, other pattern forming methods such as the above-described screen printing method or ink jet printing method may be used. However, as described above, the photolithography method is a kind of preferable forming method in that it can be thinned to an extent that can effectively improve the step problem as compared with the screen printing method and can be easily formed with high accuracy. It is.

(Color pigment)
As a color pigment used for the colored resin layer 2c, a color pigment exhibiting an arbitrary color including a black pigment exhibiting black can be used, and there is no particular limitation.
However, in the light shielding layer 2 made of the colored resin layer 2c and the metal reflective layer 2m, since the black color is not expressed, even when only the black pigment is used as the colored pigment to be included in the colored resin layer 2c, the colored resin layer 2c. It is not included until the content of which shows black. In addition, the black pigment is used in color expression with reduced brightness even in chromatic colors by using in combination with colored pigments of other colors.

  In the present invention, that the colored resin layer 2c is black means that the transmittance is 20% (optical density OD0.7) or less when the color of the achromatic colored resin layer 2c is measured with transmitted light. means.

  Here, the optical action of the colored resin layer 2c will be described. Light incident on the colored resin layer 2c from the translucent substrate 1 side is reflected by the metal reflective layer 2m and incident on the colored resin layer 2c again. Light is emitted to the optical substrate 1 side. That is, since the light is reflected by the metal reflection layer 2m and passes through the colored resin layer 2c twice and attenuates, assuming that the metal reflection layer 2m reflects 100% of the light, the transmittance is 20%. The colored resin layer 2c behaves as a layer having a transmittance of 4% (0.20 × 0.20) in a virtual configuration in which the metal reflective layer 2m is not present.

  Therefore, for example, the colored resin layer 2c containing only the black pigment as the color pigment and having a transmittance of 50% is not gray but is gray in the present invention. When the light shielding layer 2 is composed of the gray colored resin layer 2c having a transmittance of 50% and the silver metal reflective layer 2m, the light shielding layer 2 expresses a gray metallic design.

Examples of the black pigment exhibiting black color include titanium black (low-order titanium oxide, titanium oxynitride, etc.), carbon black, and the like.
As the coloring pigment other than black, for example, a red pigment, a yellow pigment, a blue pigment, a green pigment, a purple pigment, and the like can be used.

The red pigment is, for example, a red pigment such as diketopyrrolopyrrole, anthraquinone, or perylene, and the yellow pigment is, for example, a yellow pigment such as isoindoline or anthraquinone, and the blue pigment is For example, it is a blue pigment such as copper phthalocyanine or anthraquinone, and the green pigment is, for example, a green pigment such as phthalocyanine or isoindoline.
Specific examples include diketopyrrolopyrrole red pigments such as Pigment Red 254 (PR254), anthraquinone red pigments such as Pigment Red 177 (PR177), and isoindoline type pigments such as Pigment Yellow 139 (PY139). Yellow pigments, copper phthalocyanine-based blue pigments such as pigment blue PB15: 6 (PB15: 6), and the like can be used.
As the purple pigment, a quinacridone-based purple pigment such as pigment violet 23 (PV23) can be used. Further, a color pigment exhibiting a color other than these, that is, a hue, can also be used.

  The size of the color pigment particles is usually 1 μm or less in average particle size, preferably about 0.03 to 0.3 μm.

  The color pigments may be used alone, or a plurality of types of color pigments of the same type or different colors may be used.

The colored resin layer 2c adjusts the metallic tone strength expressed by the metal reflective layer 2m by adjusting the transmittance of the colored resin layer 2c itself according to the content and thickness of the color pigment.
For example, the transmittance of the colored resin layer 2c is 20% for red and 15% for blue.

  The content of the colored pigment depends on the color density in the metallic feeling expressed by the colored resin layer 2c and the metal reflective layer 2m, but the total solid content of the colored resin layer 2c containing the colored pigment and the resin binder. The pigment concentration, expressed as a percentage of the amount of the colored pigment with respect to, is usually about 10 to 60%. In other words, the color pigment is usually in the range of 10 to 60 parts by mass with respect to 100 parts by mass of the total solid content of the colored resin layer 2c.

  Here, when the metal reflective layer 2m is not colored, in a simple word, when the metal reflective layer 2m is silver, a specific example of the color pigment used for the colored resin layer 2c is illustrated as an example of the colored resin layer 2c. When the light-shielding layer 2 and the metallic reflective layer 2m are used to express a metallic blue design, copper phthalocyanine-based blue pigment may be used as the color pigment. Further, when a metallic red design is expressed by the light shielding layer 2, an anthraquinone red pigment or a diketopyrrolopyrrole red pigment may be used as the color pigment. Further, when a metallic yellow design is expressed by the light shielding layer 2, an isoindoline-based yellow pigment may be used as the yellow pigment.

  More specifically, for example, as the blue pigment, pigment blue PB15: 6 (PB15: 6) can be used as a copper phthalocyanine-based blue pigment. As the red pigment, Pigment Red 177 (PR177), a diketopyrrolopyrrole red pigment, or the like can be used as an anthraquinone red pigment. As the yellow pigment, Pigment Yellow 139 (PY139) can be used as an isoindoline-based yellow pigment.

(Curable resin)
As said curable resin used as the resin component of the resin binder which disperse | distributes and holds a color pigment, 1 or more types of resin chosen from photosensitive resin and a thermosetting resin can be used.

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

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

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

  As the thermosetting resin, for example, one or more of acrylic resin, epoxy resin, polyester resin, polyimide resin, and the like can be used.

 In addition to the above, the resin binder of the colored resin layer 2c can include various known additives such as a photosensitizer, a dispersant, a surfactant, a stabilizer, and a leveling agent.

(Formation of colored resin layer 2c)
The formation method of the colored resin layer 2c is not particularly limited in the present invention, but the colored resin layer 2c contains a color pigment in a resin binder containing an uncured product of the curable resin. It can form with a colored curable resin composition.
The colored curable resin composition may further contain a solvent for adjusting the coating suitability when the resin composition is applied onto the surface of the light-transmitting substrate 1 or the printing suitability for printing. it can.
As the solvent, for example, one or more of propylene glycol monomethyl ether, propylene glycol monomethyl ether acetate, ethyl cellosolve, 3-methoxybutyl acetate, and the like can be used.

  When a photosensitive resin is used as the curable resin, as described above, a colored curable resin composition containing an uncured product of a color pigment and a curable resin, or an uncured product of the colored pigment and the photosensitive resin. Conventionally, a color resist material adjusted for color filter use may be used.

  When using a photosensitive resin as the curable resin, a method of applying the colored curable resin composition on the surface of the translucent substrate 1 is, for example, a spin coating method, a roll coating method, a die coating method, a spray coating method, A known coating method such as a bead coating method can be used.

  When a photosensitive resin is used as the curable resin, a colored curable resin composition (colored photosensitive resin composition) is applied on the surface of the translucent substrate 1 and then exposed and developed using a photolithography technique. The colored resin layer 2c having a predetermined pattern can be formed on a part of the surface of the translucent substrate 1 by patterning through a predetermined process such as baking.

  When a thermosetting resin is used as the curable resin of the colored curable resin composition, it is formed into a pattern by a printing method using an ink made of the colored curable resin composition. As a printing method, a method capable of forming a film thickness of 6 μm or less is preferable. For example, an offset printing method, a flexographic printing method, an inkjet printing method, or the like is appropriately employed.

(Pattern expression by colored resin layer 2c)
In the present embodiment, the colored resin layer 2c is formed as a so-called “solid layer” having a constant film thickness over the entire opaque region A2.
However, even when the colored resin layer 2c is formed of a solid layer over the entire opaque region A2, the thickness may be changed. By changing the film thickness, an arbitrary pattern can be expressed as a pattern of transmittance and coloring density even for the same color. The pattern of the transmittance and the coloring density becomes the intensity pattern of the reflected light from the metal reflection layer 2m.
In order to change the film thickness of the colored resin layer 2c, the colored resin layer 2c is once formed on the entire surface by a coating method or the like and then patterned by a photolithography method to form a predetermined colored resin layer 2c pattern. In addition, an arbitrary change in film thickness can be formed by patterning with different exposure intensities. Alternatively, a pattern can be expressed as a change in halftone dot area or halftone dot density (film thickness) by a printing method that can be easily formed to a thickness of 6 μm or less, such as 1 μm or 2 μm, for offset printing or flexographic printing. May be.

(Multilayer colored resin layer 2c)
Although the colored resin layer 2c is a single layer, in the present invention, the colored resin layer 2c may have a multilayer structure of two or more layers. For example, three layers of different colors may be stacked to express a full color design with three convenient colors. If one colored resin layer 2c is formed with a thickness of 1.5 μm, it can be sufficiently formed with three layers of 4.5 μm and the entire colored resin layer 2c of 6 μm or less.

[Metal reflective layer 2m]
The metal reflection layer 2m is a layer made of a metal thin film layer that contains one or more metal materials made of a metal or a metal compound, is opaque in visible light and has a shielding property, and exhibits a metal color and is a light reflective layer. It is.

  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.

The metallic reflection means light reflection characteristic of the metal surface. Accordingly, even if it is a metal, for example, a material with a black surface and weak reflection such as matte black is not applicable.
The reflectivity of the metallic reflection depends on the metallic feeling to be expressed, but the reflectance should be 20% or more. In order to express a strong metallic feeling, the reflectance should be 70% or more. Is good.
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 metal reflective layer 2m as a percentage.
If the metal reflective layer 2m is made of ordinary aluminum or silver, a film thickness of about 300 nm and a reflectance of 70% or more can be easily realized.

The opaqueness 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 OD4.0 or more) in total light transmittance. However, it means that the total light transmittance is 1% or less (optical density OD2.0 or more) at the minimum.
If the total light transmittance is 0.01% or less, the light-shielding property as the light-shielding layer 2 can be sufficiently secured only by the metal reflective layer 2m, and the colored resin layer 2c is mainly focused on design expression. Can be designed.
In addition, if the metal reflective layer is 2 m such as normal aluminum or silver, a total light transmittance of 0.01% or less can be easily realized with a film thickness of about 300 nm.

In order to form the metal reflection layer 2m in the pattern shape of the light shielding layer 2, the metal reflection layer 2m is once formed as a metal thin film layer and then patterned by photolithography to form a predetermined pattern. it can.
The metal reflection layer 2m can be formed as a metal thin film layer by a known thin film formation 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. .
The thickness of the metal reflective layer 2m is preferably thin in order to improve the problem of the level difference of the light shielding layer 2, but the metal reflective layer 2m can ensure a sufficient light shielding property even at 500 nm. There is no need. For this reason, the film thickness of the metal reflective layer 2m can be generally formed with a thickness of about 10 to 300 nm.

  The metal reflection layer 2m may be conductive or non-conductive. When the metal reflective layer 2m is non-conductive, when part or all of the touch panel function is integrated, the surface of the metal reflective layer 2m is not short-circuited with wiring, transparent electrodes, etc. It can be used as an insulating circuit board surface. However, since the metal reflectivity of the metal reflective layer 2m made of a metal material is also related to conductivity in principle, it depends on the metallic design to be expressed.

The interface between the metal reflective layer 2m and the colored resin layer 2c may be flat or uneven. When flat, mirror reflection by the metal reflection layer 2m is possible, and a metallic feeling using the mirror reflection can be expressed. In the case of a concavo-convex surface, for example, a matte metallic feeling of irregular concavoconvexity and a hairline metallic sensation that is a kind of regular concavoconvexity can be expressed.
The unevenness at the interface between the metal reflective layer 2m and the colored resin layer 2c should be an uneven surface that matches the design of the surface of the colored resin layer 2c that forms the metal reflective layer 2m. Can be formed.

  Alternatively, a transparent layer such as a transparent resin layer or an inorganic transparent layer is interposed between the metal reflective layer 2m and the colored resin layer 2c, and the surface of the transparent layer is made an uneven surface according to the design. Can be formed. The transparent layer can also serve as an adhesion reinforcing layer such as a primer layer or a vapor deposition anchor layer formed for the purpose of improving the adhesion of the metal reflective layer 2m to the colored resin layer 2c. As the resin material of the transparent resin layer and the inorganic material of the inorganic transparent layer, a known material that can form a transparent layer can be used. The inorganic transparent layer may be a transparent conductive thin film such as ITO or IZO.

[Color represented by the colored resin layer 2c and the metal reflective layer 2m]
The color of the metallic tone design expressed by the light shielding layer 2 is such that light enters the colored resin layer 2c, reaches and reflects the metal reflecting layer 2m, enters the colored resin layer 2c again, and enters the colored resin layer 2c. It becomes the color of the light after passing 2c twice. Accordingly, the color of the metallic design expressed by the light shielding layer 2 is a color obtained by multiplying the color of the colored resin layer 2c and the color of the reflection color of the metal reflection layer 2m. If the color of the metal reflection layer 2m is, for example, silver, it is an achromatic color, so the color (hue) of the light shielding layer 2 is the color of the colored resin layer 2c.
When the metal reflective layer 2m has a color, it becomes a metallic design of a color obtained by multiplying the color of the metal reflective layer 2m and the color of the colored resin layer 2c. The color of the metal reflective layer 2m is, for example, gold when the metal reflective layer 2m is a metal thin film layer made of gold, or copper color when the metal reflective layer 2m is a metal thin film layer made of copper.
From the above, for example, if a golden metallic design is to be expressed, it can be expressed by the silver metal reflective layer 2m and the yellow colored resin layer 2c without using the gold metal reflective layer 2m. You can also

[Example of metallic color expressed by the light shielding layer 2]
Here, examples of metallic tones expressed by the light shielding layer 2 will be further described.
Table 1 shows the color measurement results of the color expressed by the light shielding layer when the metal reflection layer 2m constituting the light shielding layer 2 is silver and the colored resin layer 2c is red and blue. As the metal reflection layer 2m, a metal thin film layer having a metallic luster having a thickness of 300 nm made of a silver alloy exhibiting a silver color is used. The film thickness of the colored resin layer 2c is 3 μm. For this reason, most of the film thickness of the light shielding layer 2 is the film thickness of the colored resin layer 2c, and the film thickness of the metal reflective layer 2m is 1/10 or less of the film thickness of the colored resin layer 2c.
FIG. 2 is a cross-sectional view for explaining the conditions for measuring the color of the light-shielding layer 2. [A] shows how the color of the transmitted light is measured only for the colored resin layer 2c without the metal reflection layer 2m. . [B] shows a state in which the color of the reflected light is measured with respect to the light-shielding layer in which the black layer Bk is overlaid on the colored resin layer 2c instead of the metal reflective layer 2m. [C] shows how the color of reflected light is measured with respect to the light-shielding layer 2 having the configuration of the present invention in which the metal reflective layer 2m is superimposed on the colored resin layer 2c.
The measurement was performed with a spectrophotometer, and the measurement with reflected light was performed under the condition of specular reflection light inclusion (SCI). Table 1 shows the x value, y value, and Y value of the Yxy color system.

The color measured with transmitted light without the metal reflection layer 2m represents the color of the colored resin layer 2c itself. The color measured by the reflected light with respect to the light-shielding layer in which the black layer Bk is superimposed on the colored resin layer 2c represents the color of the light reflected by the light-shielding layer when there is no light reflected by the metal reflective layer 2m. Yes. In the configuration in which the black layer Bk is overlaid, as shown in Table 1, the Y value related to lightness is small, and the x value and the y value are close to 0.333 when the white color is achromatic. It can be seen that the color is close to black.
And as for the color of the light shielding layer 2 of the structure of this invention which accumulated the metal reflective layer 2m, metallic red and blue were visually recognized.

[Visible information 6]
In the front protective plate 10 for a display device in the present embodiment illustrated in FIG. 1, a product logo mark is formed as visible information 6 in the opaque region A <b> 2 where the light shielding layer 2 is formed.
In the present invention, the visible information 6 is not essential, but in addition to the product logo mark, visible information 6 such as characters, symbols, and patterns for operation explanation can be provided for the opaque region A2.

The visible information 6 can be formed, for example, as a pattern of a non-formed part of the light shielding layer 2.
The cross-sectional view of FIG. 3 shows three examples as a configuration example for forming the visible information 6 in the light shielding layer 2 including the colored resin layer 2c and the metal reflective layer 2m. FIG. 3A shows a configuration in which the visible information 6 is formed as a non-formed portion of the colored resin layer 2c and the metal reflective layer 2m. FIG. 3B shows a configuration in which the visible information 6 is formed as a non-formed portion of the metal reflective layer 2m. FIG.3 (c) is the structure which formed the visible information 6 as a non-formation part of the colored resin layer 2c.
In the configuration in which the visible information 6 in FIG. 3A is formed as a non-formation part of the colored resin layer 2c and the metal reflective layer 2m, the colored resin layer 2c and the metal reflective layer 2m constituting the light shielding layer 2 are not formed respectively. The same pattern is formed at the same plan view position so that the parts overlap in plan view. In this configuration, the visible information 6 illuminated from the back side can be expressed in the non-formed part.
In the configuration of FIG. 3B in which the visible information 6 is formed as a non-formed portion of the metal reflective layer 2m, the visible information 6 illuminated from the back side can be expressed by the non-formed portion.
In the configuration of FIG. 3C in which the visible information 6 is formed as a non-formed portion of the colored resin layer 2c, the visible information 6 is expressed by the metal reflective layer 2m that can be seen in the non-formed portion of the colored resin layer 2c.
Alternatively, although not shown, when the colored resin layer 2c has a multi-layer configuration of different colors, if a non-formed part is formed for some layers of the multi-layer configuration, depending on the color of the remaining layer, Visible information 6 of a different color from the above can be obtained. Or you may provide the colored resin layer 2c of a different color only in the part of the visible information 6. FIG.

As described above, the visible information 6 is, for example, formed as a pattern of a non-formation part of the layer constituting the light shielding layer 2, and between the light shielding layer 2 and the translucent substrate 1, It can be formed as a layer having a pattern with different colors. When formed as a layer of a color different from that of the light shielding layer 2, the material and method similar to those of the light shielding layer 2 can be used for forming the visible information 6.
In the present invention, the visible information 6 formed in the opaque region A2 does not necessarily need to be as opaque as the light shielding layer 2 because it is in the region of the opaque region A2. For example, it is the visible information 6 such as characters and symbols for operation explanation that are illuminated from the back side so that it can be seen even in a dark place.
Further, in the present invention, for example, visible information formed as a non-formation part of the light shielding layer 2 in the opaque area A2 if it does not hinder the concealment of the wiring on the outer periphery of the touch panel 20 or the display panel 30. As shown in FIG. 6, a region having a light shielding property smaller than the light shielding layer 2, such as being transparent, may exist in a part.

[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.

[Integration with touch panel function]
In the embodiment shown in FIG. 1, the front protective plate 10 for a display device includes a translucent substrate 1 and a light shielding layer 2 formed in an opaque region A <b> 2, and the light shielding layer 2 is the translucent substrate 1. This is an example in which the colored resin layer 2c and the metal reflective layer 2m are sequentially formed from the side, and the visible information 6 is also included in the opaque region A2.
However, other components may be provided in the present invention. One of them is integration with the touch panel function. For example, a transparent electrode for a touch panel may be provided, and the translucent substrate 1 may also be used as a touch panel substrate. Integration with the touch panel function can be achieved by reducing the number of parts and reducing the thickness 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 all the functions necessary for a touch panel can also be called a touch panel. The front protective plate 10 for a display device that integrates a part of functions necessary as a touch panel can also be referred to as a touch panel member. For example, when a part of the touch panel function is integrated, at least the transparent electrode is integrated in a system that requires a transparent electrode for position detection as the touch panel function. Various types of touch panel position detection methods are conventionally known. In the position detection method in which the transparent electrode has two layers, it is desirable to integrate at least one of these, more preferably two layers.
Hereinafter, an example of integration of the touch panel function will be described with reference to the embodiment of FIG.

In the embodiment of the front protective plate 10 for display device shown in the cross-sectional view of FIG. 4, the transparent electrode 8 and the wiring 9 for the touch panel are further formed on the second surface S2 on the side where the light shielding layer 2 is formed. It is a structural example. Here, the transparent electrode 8 for the touch panel is a projected capacitive electrode.
More specifically, in the present embodiment, the transparent electrode 8 for detecting the position of the touch panel is further provided on the second surface S2 which is one surface after the light shielding layer 2 of the translucent substrate 1 is formed. An opaque wiring 9 formed and electrically connected at the portion of the light shielding layer 2 to the transparent electrode 8 extending from the display region A1 to the portion of the opaque region A2 where the light shielding layer 2 is present, In this configuration, the light shielding layer 2 is formed via an insulating layer 3a.

  The insulating layer 3a insulates the wiring 9 and the metal reflective layer 2m and prevents the wirings 9 independent of each other from short-circuiting. In this embodiment, since the metal reflective layer 2m is also conductive, the insulating layer 3a is used as an insulating circuit board for forming the wiring 9 and also as a protective layer for preventing deterioration due to oxidation of the metal reflective layer 2m. It is provided. Since this insulating layer 3a is formed including the display region A1 in addition to the opaque region A2 having the wiring 9, it is formed as a transparent layer so as not to hinder the display.

The insulating layer 3a is preferably a transparent resin, which is preferably a curable resin in terms of heat resistance. For example, an epoxy resin, an acrylic resin, a polyimide resin, or the like can be used. A thermosetting epoxy resin or the like can be used. The insulating layer 3a can be formed by the same coating method as the light shielding layer 2.
Further, as the curable resin, the photosensitive resin described in the colored resin layer 2c can be used. In the case of a photosensitive resin, a photolithography method can be used when partially forming.

  For the wiring 9, 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, can be used.

FIG. 5 is a plan view of the display device front protective plate 10 of the embodiment shown in FIG. 4 as viewed from the translucent substrate 1 side.
As shown in FIG. 5, the opaque wiring 9 provided in the portion of the light shielding layer 2 is hidden by the light shielding layer 2 by the light shielding layer 2 provided in the opaque region A <b> 2 on the outer peripheral portion and is not visible from the front side. . In FIG. 5, the position detection electrode 8 of the touch panel is present in the display area A <b> 1 indicated by fine grid hatching, but the pattern is hardly visible to the naked eye.
Although the visible information 6 is clearly shown in the plan view of FIG. 5, the visible information 6 is not shown in the sectional view of FIG. 4 in order to complicate the drawing.

  Returning to the sectional view of FIG. 4, as the transparent electrode 8 for position detection, the first transparent electrode 8 a and the second transparent electrode 8 b are the same surface of the translucent substrate 1 in this embodiment. In order to form on the surface of a certain 2nd surface S2, it forms mutually insulated via the insulating layer 3b. Various patterns are known for the pattern of the first transparent electrode 8a and the second transparent electrode 8b in the projection capacitive method, and there is no particular limitation. Typically, the plurality of first transparent electrodes 8a extend in the first direction, and the second transparent electrode has a direction intersecting the first direction, usually a direction orthogonal thereto as the second direction. 8b is a pattern extending in the second direction.

For example, the intersection of the first transparent electrode 8a and the second transparent electrode 8b is insulated by the insulating layer 3b. The insulating layer 3b is required at least at the intersection between the first transparent electrode 8a and the second transparent electrode 8b. Only one of the first transparent electrode 8a and the second transparent electrode 8b is formed on the same surface at the same time in a pattern in which the intersection with the other electrode is missing, and then only the intersection is the insulating layer 3b. After that, a transparent electrode is formed as a connection portion for electrically connecting the defective portion.
In the cross-sectional view of FIG. 4, since the transparent electrode 8 on the side close to the translucent substrate 1 is the first transparent electrode 8a, the intersecting portion is after the first transparent electrode 8a is formed. An insulating layer 3b is formed at the intersecting portion, a transparent electrode for connection is formed across the intersecting portion, and the second transparent electrode 8b is completed.

  The insulating layer 3b can be formed by the same material and method as the insulating layer 3a described above. Therefore, further explanation is omitted.

Then, the second transparent electrode 8a and the second transparent electrode 8b are themselves opaque and visible on the portion extending from the position detection region in the central display region A1 to the portion overlapping the light shielding layer 2. A wiring 9 that can be formed is formed. In the drawing, the wiring 9 is schematically drawn only for the first transparent electrode 8a.
Further, an overcoat layer 7 is formed on almost the entire second surface S2 of the translucent substrate 1 on which the wiring 9 is formed after the wiring 9 is formed, and the first transparent electrode 8a and the second transparent electrode 8a are formed. The surface as the front protective plate 10 for a display device including the surface of the transparent electrode 8b is protected from scratches. However, although not shown, the overcoat layer 7 exposes the wiring 9 without forming a portion where the wiring 9 is connected to the control circuit via a flexible printed wiring board (FPC).

  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, or the like can be used. A thermosetting epoxy resin or the like can be used. Further, as the curable resin, the photosensitive resin described in the light shielding layer 2 can be used. In the case of a photosensitive resin, a photolithography method can be used when partially forming. The overcoat layer 7 can be formed by the same coating method as the light shielding layer 2.

  The first transparent electrode 8a and the second transparent electrode 8b include ITO (Indium Tin Oxide), IZO (Indium Zinc Oxide), AZO (Aluminum Zinc Oxide), and aluminum zinc oxide. ) Or the like can be used as a pattern.

Each layer constituting the display device front protective plate 10 of the embodiment illustrated in the cross-sectional view of FIG. 4 is formed as follows, for example. First, the colored resin layer 2c is pattern-formed on the second surface S2 of the translucent substrate 1, and then the metal reflective layer 2m is patterned to form the light-shielding layer 2 having a predetermined pattern. Next, after the insulating layer 3a is formed on the entire surface on the side where the light shielding layer 2 is formed, the wiring 9 is patterned on the portion of the light shielding layer 2, and then the first transparent electrode is formed as the transparent electrode 8. The entire 8a and the second transparent electrode 8b where the intersecting part is divided and lost are simultaneously formed on the same surface. At this time, since the problem of the step is improved, the first transparent electrode 8a is not disconnected at the step D portion of the light shielding layer 2. Although not shown, the second transparent electrode 8b is not similarly disconnected.
Next, the insulating layer 3b is patterned at the intersecting portion, and the remaining defective portion of the second transparent electrode 8b is patterned across the insulating layer 3b to complete the entire second transparent electrode 8b. Let Finally, by forming the overcoat layer 7 on the entire surface, the front protective plate 10 for a display device integrated with a touch panel function is created.

  In the above-described embodiment, the wiring 9 provided in the periphery of the central position detection region as the touch panel, which is opaque and visible, is provided in the region overlapping the light shielding layer 2 in plan view, thereby displaying the display device. The appearance is not impaired when applied to. In addition, the light shielding layer 2 is a decorative layer that expresses a metallic design, and improves the problem of the level difference of the light shielding layer 2 while ensuring the light shielding property. For this reason, the problem of disconnection when the transparent electrode 8 is extended to the light shielding layer 2 and the problem of residual bubbles at the time of bonding can be reduced, and the yield can be improved. Furthermore, it also has a touch panel function, which is effective for reducing the number of parts and reducing the weight.

[C] Display device:
The display device according to the present invention includes the display device front protective plate 10 and the display panel, and further includes a touch panel when the display device front protective plate 10 does not have a touch panel function. Device.
That is, the display device according to the present invention includes the above-described front protective plate 10 for a display device, a touch panel, and a display panel, and the touch panel includes the opaque wiring 9 around the transparent electrode 8 for position detection. Is the structure arranged so as to be invisible from the display device front protective plate 10 side, overlapping the light shielding layer 2 of the device front protective plate 10, or
Or it is the structure provided with the front-surface protective plate 10 for display apparatuses which also has the transparent electrode 8 for touchscreens, and the opaque wiring 9, and a display panel.

FIG. 6 shows an embodiment of a display device according to the present invention. A display device 100 shown in FIG. 6 includes a display device front protective plate 10, a touch panel 20, and a display panel in order from the front side on the viewer V side above the drawing. 30.
In the present embodiment, 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 display device front protective plate 10 has a form in which the touch panel function is not integrated. The touch panel 20 schematically shows the wiring 9 and the transparent electrode 8.

The touch panel 20 is typically a projected capacitive touch panel capable of multi-touch (multi-point simultaneous input). In addition to this, a surface capacitive method, a resistive film method, an electromagnetic induction method, and the like. Any of various known position detection touch panels including a position detection method that does not require a transparent electrode, such as an optical method, may be used.
The touch panel 20 has some opaque components such as a wiring 9, a control circuit, and a connector for electrically connecting them to 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 the wiring 9 can be prevented from deteriorating the appearance of the display device 100.

  The display panel 30 is typically a liquid crystal display panel or an electroluminescence (EL) panel, but may be an electronic paper panel, a display device using a cathode ray tube, or various known display panels.

  By using the display device 100 configured as described above, the display content itself that is present in the outer periphery of the position detection region of the touch panel 20 or the outer periphery of the display region of the display panel 30 is unnecessary. Various components such as wiring, connectors, and control circuits can be hidden to prevent the appearance from being damaged.

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

[Front protective plate 10 for display device with integrated touch panel function]
In the display device 100 according to the embodiment illustrated in FIG. 6, the display device front protective plate 10 has a form in which no touch panel function is integrated. However, in the present invention, the display device front protective plate 10 included in the display device 100 may be integrated with part or all of the touch panel function. 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 and the display panel 30. 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.

  Further, the touch panel to be incorporated is of a type provided with a transparent electrode, and the transparent electrode 8 consists of two layers of a first transparent electrode 8a and a second transparent electrode 8b that are insulated from each other, In the case where the two layers are formed on different substrates, one of these substrates is used as the light-transmitting substrate 1 of the display device front protective plate 10 so that one of the transparent layers is transparent. It is also possible to form the display device 100 by integrating with the electrode and incorporating the other transparent electrode and the substrate as a touch panel constituent member separate from the display device front protective plate 10 and the display panel 30. What is necessary is just to select the structure suitable for various conditions, such as the manufacturing equipment which can be used, an assembly process, as what structure the front surface protection plate 10 for display apparatuses and a touch panel function are integrated.

[Interposition of resin layer such as adhesive sheet]
In the display device 100 according to the embodiment illustrated in FIG. 6, the display device front protective plate 10 and the touch panel 20 have a structure having a gap and an air layer. The space between the device front protective plate 10 and the touch panel 20 may be filled with a resin layer such as an adhesive layer. In particular, the front protective plate 10 for a display device according to the present invention has improved the problem of the level difference of the light shielding layer 2, so that even if the resin layer is completely filled, residual bubbles G are generated at the level difference portion of the light shielding layer 2. Can reduce and improve.
An adhesive sheet having a thickness of about 50 to 200 μm can be used for the resin layer. As the thickness of the pressure-sensitive adhesive sheet is increased, the generation of residual bubbles G in the step portion can be reduced. However, in the present invention in which the thickness of the light shielding layer 2 is as thin as 6 μm or less, for example, the problem of the step is improved. As the pressure-sensitive adhesive sheet to be used, a thinner one can be used, which can contribute to the reduction in thickness and weight of the product.
As the pressure-sensitive adhesive sheet, an optical grade sheet excellent in transparency is preferable, and as such a pressure-sensitive adhesive sheet, an acrylic pressure-sensitive adhesive, a polyester-based pressure-sensitive adhesive, an epoxy-based pressure-sensitive adhesive, a silicone-based pressure-sensitive adhesive, or the like is used. Can be used.

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

DESCRIPTION OF SYMBOLS 1 Translucent board | substrate 2 Light-shielding layer 2c Colored resin layer 2m Metal reflecting layer 3a, 3b Insulating layer 5 (Conventional) light-shielding layer 6 Visible information 7 Overcoat layer 8 Transparent electrode 8a 1st transparent electrode 8b 2nd transparent electrode 9 Wiring 10 Front protective plate for display device 20 Touch panel 30 Display panel 40 Front protective plate for conventional display device 40A Conventional front protective plate for display device (integrated form of touch panel)
DESCRIPTION OF SYMBOLS 100 Display apparatus 200 Conventional display apparatus A1 Display area A2 Opaque area Bk Black layer G Residual bubble
D Step S1 1st surface S2 2nd surface V Observer

Claims (4)

A front protective plate for a display device having a central display area and an opaque area that is provided on the outer periphery of the display area and shields visible light,
A translucent substrate, and 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. And
The light shielding layer, in order from the translucent substrate side, is composed of a colored resin layer and an opaque metal reflective layer made of a metal thin film layer,
The colored resin layer contains a colored pigment in a resin binder made of a cured product of a curable resin, exhibits a chromatic color other than black or gray,
Thickness of the colored resin layer is attached a change I der below 6 [mu] m,
The metal reflective layer has a metallic color and is light reflective,
A transparent electrode for position detection of the touch panel is further formed on one surface after the light shielding layer of the light transmitting substrate is formed.
Front protective plate for display devices.   An opaque wiring electrically connected at the light shielding layer portion to the transparent electrode extending from the display region to the opaque region portion having the light shielding layer has an insulating layer at the light shielding layer portion. The front protective plate for a display device according to claim 1, which is formed via A front protective plate for a display device according to claim 1, a touch panel, and a display panel, wherein the touch panel has an opaque wiring around a transparent electrode for position detection, the light shielding layer of the front protective plate for the display device. Or is arranged to be invisible from the display device front protective plate side,
Or it is the structure provided with the front-surface protective plate for display apparatuses which also has the transparent electrode and opaque wiring for touchscreens of Claim 2, and a display panel.
Display device.   The display device according to claim 3, wherein the display panel is a liquid crystal panel or an electroluminescent panel.

Images