JP6136184B2 - Front protective plate for display device with wiring, and display device - Google Patents

Description

  The present invention relates to a front protective plate for a display device with wiring, and a display device. In particular, the front protective plate for a display device with wiring, which can make the wiring inconspicuous while supplementing the light shielding property when the decorative part is white or the like and the light shielding property is insufficient and the wiring on the back side can be seen through, and the display device having the same About.

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

FIG. 7 is a cross-sectional view schematically showing an example of a conventional display device 200 provided with the touch panel 20.
The touch panel 20 is arranged with respect to the display panel 30 on the front side (the upper side of the drawing which is the viewer V side in the figure) which is the light output side of the display light from the display panel 30. Further, in order to protect the touch panel 20, a display device front protective plate 40 is disposed on the front side of the touch panel 20, which is a side where display light from the display panel 30 passes through the touch panel 20 and emits light (Patent Document 1). Patent Document 2, Patent Document 3).

FIG. 8 is a plan view of the display device front protective plate 40 as viewed from the front side.
As shown in FIGS. 7 and 8, the conventional front protective plate 40 for a display device usually has an outer peripheral portion of the display area A1 as an opaque area A2, and the opaque area A2 has a light shielding layer 9 formed therein. It is formed on the translucent substrate 1. The light shielding layer 9 is usually constituted by a colored resin layer containing a color pigment in a resin binder. The opaque area A2 prevents the touch panel 20 disposed on the back side of the display device front protective plate 40 from seeing the wiring 3 and connectors on the outer periphery thereof so as not to impair the appearance. Further, visible information 8 such as a product logo is also provided in the opaque area A2 as appropriate, and the opaque area A2 also serves as a decoration part of the front protective plate 40 for a display device.

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

FIG. 9 is a cross-sectional view schematically showing an example of a conventional display device 200 provided with a front protective plate 50 for a display device with a wiring integrated with a touch panel.
FIG. 10 is a plan view schematically showing an example of a front protective plate 50 for a conventional display device with a wiring integrated with a touch panel when viewed from the back side.
In the example shown in FIGS. 9 and 10, a conventional front protective plate 50 for a display device with wiring includes a wiring 3 for a touch panel and a transparent electrode 5.

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

By the way, the light shielding layer 9 in the opaque region A2 is usually black from the viewpoint of light shielding properties, but recently, a white design such as pure white or ivory color is desired by changing the taste. Sometimes.
Therefore, if the light shielding layer 9 is formed of a white resin layer containing a white pigment in a resin binder instead of a black pigment such as carbon black so that a white design can be expressed, a white color is temporarily formed. The design can be expressed. However, in this configuration, the white resin layer is inferior in light shielding performance as compared with the black resin layer, and therefore, as shown in FIG. 11 (b) as compared with the conventional black light shielding layer 9B shown in FIG. 11 (a). Thus, it is necessary to increase the film thickness of the white light-shielding layer 9 </ b> W, and the problem of the step of the light-shielding layer 9 becomes significant.

  Since the light shielding layer 9 is usually formed by screen printing and the film thickness is as thick as 20 μm or more, for example, when the touch panel function is integrated, disconnection tends to occur when the transparent electrode 5 is formed across the steps, Further, when the space between the display panel 30 and the display panel 30 is filled with air, air tends to remain as residual bubbles in the stepped portion. In addition, in the case of a white resin layer, satisfactory light shielding properties cannot be obtained unless the film thickness is increased to about 30 to 40 μm.

  The problem of the level difference of the light shielding layer 9 can be improved by forming the light shielding layer 9 as thin as, for example, 6 μm or less. For example, the problem of residual bubbles and disconnection can be improved by forming the light shielding layer 9 not by the screen printing method but by the photolithography method using a photosensitive resin.

  However, even if the light shielding layer 9 is formed using a photosensitive resin by a photolithography method, as described above, a white resin layer using a white pigment is used as a light shielding layer 9 in order to express a white color as a design. In this case, since the light shielding property itself, which is the basic performance of the light shielding layer 9, cannot be obtained sufficiently, it is not possible to satisfy all of the problem of the step, the light shielding property, and the white design expression.

  Moreover, if the white resin layer is formed with a thickness of 6 μm or less, for example, in order to integrate the touch panel function while improving the problem of the level difference by expressing the white design, as shown in FIG. . For this reason, the reflected light intensity of the light L1 incident on the portion of the wiring 3 formed on the surface of the light shielding layer 9 from the light transmitting substrate 1 side is the light L2 incident on the other portion from the light transmitting substrate 1 side. As a result, the wiring 3 can be seen through.

  An object of the present invention is to provide a front protective plate for a display device with a wiring in which wiring for a touch panel or the like is integrated, even if the light shielding property of the light shielding layer is insufficient due to a white color, etc. This makes it difficult to notice the wiring. Moreover, it is providing the display apparatus provided with the front surface protection board for such a display apparatus with wiring.

In this invention, it was set as the front protection board for display apparatuses with wiring of the following structures, and a display apparatus.
(1) A front protective plate for a display device with a wiring, which has a central display region and an opaque region that is provided on an outer peripheral portion of the display region and shields visible light, and has an opaque wiring in the opaque region Because
A translucent substrate;
A light shielding layer provided in the opaque region on one surface of the translucent substrate;
The wiring provided on the surface of the light shielding layer;
A dummy pattern formed on the surface of the light-shielding layer and on the surface where the wiring is formed, on the portion where the wiring is not formed, separated from the wiring and formed of the same material as the wiring;
Having at least
Front protective plate for display device with wiring.
(2) A transparent electrode for position detection of the touch panel is further provided on one surface of the translucent substrate so as to extend from the display region to the light shielding layer portion of the opaque region, The front protective plate for a display device with a wiring according to (1), wherein the light shielding layer is electrically connected to the wiring.
(3) Whether the configuration includes the front protective plate for a display device with a wiring of (1), a touch panel, and a display panel,
Or it is the structure provided with the front protective plate for display apparatuses with wiring which has the transparent electrode for touchscreens of said (2), and a display panel,
Display device.

According to the front protective plate for a display device with wiring of the present invention, when wiring for a touch panel or the like is integrated on the back side of the light shielding layer, even if the light shielding property of the light shielding layer is insufficient due to a white color, etc. Wiring on the back side of the layer can be made inconspicuous.
According to the display device of the present invention, the front protective plate for a display device with wiring included in the display device has the above-described effect.

The partial enlarged plan view seen from the back side explaining one embodiment of the front protection board for display with wiring by the present invention. The whole top view seen from the back side explaining one embodiment of the front protection board for display with wiring by the present invention. The partial expanded sectional view explaining one Embodiment of the front protection board for display apparatuses with wiring by this invention. The partial expanded sectional view explaining the disadvantage when supplementing the light-shielding property of a light shielding layer by the structure different from this invention. Sectional drawing explaining the deformation | transformation form of the front surface protection plate for display apparatuses with wiring by this invention. Sectional drawing which illustrates typically one Embodiment of the display apparatus by this invention. Sectional drawing which shows an example of the conventional front protective plate for display apparatuses, and a display apparatus. The top view seen from the front side which shows an example of the conventional front protection plate for display apparatuses. Sectional drawing which shows an example of the front surface protective plate for conventional display apparatuses with wiring, and a display apparatus. The top view seen from the back side which shows an example of the conventional front protection board for display apparatuses with wiring. Sectional drawing explaining the difference in film thickness when a light shielding layer turns into white type (b) from black type (a). Sectional drawing explaining the principle by which the pattern of wiring can be seen through with the conventional white-type light shielding layer.

    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.

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

[B] Front protective plate for display device with wiring:
An embodiment of a front protective plate for a display device with wiring according to the present invention will be described with reference to FIGS. FIG. 1 is a schematic partially enlarged plan view of a front protective plate 10 for a display device with wiring as viewed from the back side. FIG. 2 is a schematic overall plan view of the front protective plate 10 for a display device with wiring as viewed from the back side. FIG. 3 is a schematic partial enlarged cross-sectional view of the front protective plate 10 for a display device with wiring.

As shown in the plan view of FIG. 2, the front protective plate 10 for a display device with wiring of the present embodiment is provided with a central display area A1 and an outer periphery of the display area A1 and shields visible light. And an area A2. This opaque area A2 is a decorative portion.
As shown in the sectional view of FIG. 3, the front protective plate 10 for a display device with wiring in the present embodiment includes a translucent substrate 1, a first surface S <b> 1 that is one surface of the translucent substrate 1, and this Of the two surfaces of the second surface S2 which is the other surface opposite to the one surface, the first surface S1 has the light shielding layer 2 provided in the opaque region A2. The light shielding layer 2 is a layer containing a color pigment in a resin binder made of a cured product of a photosensitive resin.

The light-shielding layer 2 is a film having a thickness of 6 μm or less by applying a colored photosensitive resin composition containing a color pigment and an uncured photosensitive resin on the light-transmitting substrate 1 and patterning it by a photolithography method. Is formed.
In the present embodiment, the light shielding layer 2 uses a white pigment as a color pigment, and expresses a white design as a white color. For this reason, only the light shielding layer 2 is in a state where the light shielding property required for the opaque region A2 of the front protective plate 10 for a display device with wiring is insufficient.

  Further, the front protective plate 10 for a display device with wiring has an opaque wiring 3 formed on the surface of the light shielding layer 2, specifically in contact with the surface of the light shielding layer 2. The wiring 3 is a touch panel wiring. The wiring 3 is made of a metal material. The wiring 3 is formed as a metal thin film by using a silver alloy (also referred to as APC) made of silver, palladium and copper as a metal material.

In addition, the front protective plate 10 for a display device with wiring is formed on the surface of the light shielding layer 2 where the wiring 3 is not formed, as schematically shown in the plan view seen from the back side of FIGS. A dummy pattern 4 is formed. The dummy pattern 4 is formed in a plan view so as to fill a portion where the wiring 3 is not formed on the surface of the light shielding layer 2 and to be spaced apart from the wiring 3. The dummy pattern 4 is simultaneously formed on the same surface as the wiring 3 with the same material as the wiring 3. For this reason, the relative positional relationship between the wiring 3 and the dummy pattern 4 does not require mutual registration at the time of formation, and the positional relationship is a highly accurate pattern. Specifically, in this embodiment, the gap between the wiring 3 and the dummy pattern 4 is a substantially constant gap between 10 and 30 μm in this embodiment.
In FIG. 1 and FIG. 2, the wiring 3 and the dummy pattern 4 are formed of the same material, but the color density of the dummy pattern 4 is made thinner than that of the wiring 3 so that they can be easily distinguished from each other. It is drawn.

FIG. 3 is a cross-sectional view for explaining that the provision of the dummy pattern 4 can suppress the wiring 3 from being visible through the light shielding layer 2 while supplementing the light shielding property of the light shielding layer 2.
As shown in the figure, the white resin layer is formed with a thickness of 6 μm or less, for example, in order to integrate the touch panel function while improving the problem of the level difference with the white design expression, and the light shielding property of the light shielding layer 2 itself is insufficient. Even if it appears slightly, the reflected light intensity of the light L1 incident on the portion of the wiring 3 formed on the surface of the light shielding layer 2 from the side of the transparent substrate 1 is similar to the reflection of the light L2 incident on the portion of the dummy pattern 4. Same as light intensity. Moreover, the gap between the wiring 3 and the dummy pattern 4 is 10 to 30 μm, which is so small that it cannot be seen with the naked eye, so that the wiring 3 and the dummy pattern 4 are connected through the light shielding layer 2 as if they were connected. See through. For this reason, even if the wiring 3 is seen through, the wiring 3 can be made inconspicuous. Further, since the wiring 3 and the dummy pattern 4 are made of an opaque metal material, the light shielding property of the light shielding layer 2 that is insufficient can be compensated.

  Furthermore, in this embodiment, as shown in FIG.1 and FIG.2, the transparent electrode 5 is formed in display area | region A1, as shown in FIG.1 and FIG.2. The transparent electrode 5 is an electrode for a projected capacitive touch panel.

  With the configuration as described above, in the present embodiment, in the front protective plate 10 for a display device with wiring in which the wiring 3 for the touch panel is integrated, the light shielding property of the light shielding layer 2 expressing a white color design is achieved. While the wiring 3 and the dummy pattern 4 can suppress the problem of the step, the dummy pattern 4 can make the wiring 3 inconspicuous. Moreover, since the dummy pattern 4 is formed simultaneously with the same material as the wiring 3, even if the dummy pattern 4 is added, the dummy pattern 4 can be manufactured without increasing the number of processes, which increases the cost. The dummy pattern 4 can be provided avoiding.

  Hereinafter, each component will be further described in detail.

[Display area A1 and opaque area A2]
As illustrated in the plan view of FIG. 2, the front protective plate 10 for a display device with wiring has a display area A1 in the center, and an opaque area A2 that shields visible light on the outer periphery of the display area A1. Have. The display area A1 is an area through which the display panel can display the contents displayed through the front protective plate 10 for a display device with wiring when the front protection plate 10 for a display device with wiring is applied to a display panel. . The display area A1 is also an area in which an active area that is a position detectable area of the touch panel is included when the front protective plate 10 for a display device with wiring is applied to the touch panel.
The opaque area A2 is an area that hides wiring, connectors, and the like that the touch panel and the display panel have on the outer periphery. Further, the opaque region A2 is also a decoration portion for decorating the front protective plate 10 for a display device with wiring by the light shielding layer 2, the color expressed by the light shielding layer 2, and visible information such as a logo or a mark.

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

[Light shielding layer 2]
The light shielding layer 2 imparts a light shielding property to visible light to the opaque region A2. The light shielding layer 2 has a function of improving the appearance design as well as a light shielding property for hiding unnecessary parts. That is, the light shielding layer 2 also has a function as a decorative layer that represents an arbitrary design. However, in the present invention, the light shielding layer 2 itself does not have sufficient light shielding properties.

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

  However, without using the dummy pattern 4 together, the wiring 3 can be seen through the light shielding layer 2 and easily noticeable when the light shielding layer 2 of the light shielding layer 2 has a transmittance exceeding 0.01%. It is easy when it exceeds 1%, and it is more conspicuous when it exceeds 3%.

The light shielding layer 2 is formed of 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 light shielding layer 2 consists of a layer which contains a color pigment in the resin binder which consists of hardened | cured material of photosensitive resin.
Although the formation method of the light shielding layer 2 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. Thereafter, 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 light shielding layer 2 is formed by a photolithography method.
Thus, the light shielding layer 2 formed by the photolithography method using the photosensitive resin composition can be made thinner than the screen printing method, for example, 6 μm or less easily. This is preferable in that the step of the light shielding layer 2 generated at the boundary with the formation portion can be reduced.
Specifically, the thickness of the light shielding layer 2 formed by photolithography using the photosensitive resin composition can be set to 0.5 to 6 μm.

  In the present invention, the light shielding layer 2 is formed in a pattern in the opaque region A2, but the pattern forming method is not limited to the photolithography method. For example, a screen printing method, an ink jet printing method, or the like is used. It may be a law. 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)
The color pigment used for the light shielding layer 2 may be any color pigment corresponding to the color expressed by the light shielding layer 2 and is not particularly limited. For example, white pigments, black pigments, red pigments, yellow pigments, blue pigments, green pigments, purple pigments, and the like can be used as the colored pigments. 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 white pigment, titanium oxide, silica, talc, kaolin, clay, barium sulfate, calcium hydroxide, and the like can be used.

  Examples of the black pigment include titanium black (low-order titanium oxide, titanium oxynitride, etc.), carbon black, and the like.

  As the red pigment, for example, a red pigment such as diketopyrrolopyrrole, anthraquinone, or perylene can be used, and 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.

(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 a reactive vinyl 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 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.

  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 light shielding layer 2 can contain various known additives such as a photosensitizer, a dispersant, a surfactant, a stabilizer, and a leveling agent.

(Expression color by shading layer 2)
The expression color by the light-shielding layer 2 is typically a white color in that the light-shielding property tends to be insufficient, but there is no particular limitation. For example, blue, green, red, brown, orange, or black (for example, transparent black, gray, etc.) colors may be used.

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

In the Munsell color system, all colors are represented by three attributes of brightness, saturation, and hue. In the Munsell color system, this brightness is 10 for the brightest ideal white and 0 for the darkest ideal black. In the present invention, the white color can be set to 8, even if the brightness is small, and can be set to 8.0 or more. In the Munsell color system, the saturation is 0 for an achromatic color, the value increases as the color becomes darker, and the maximum value varies with lightness and hue but is 14 at maximum. Since the white color is a whitish color, the saturation can be 2 or less and 2.0 or less.
The three attributes of the Munsell color system can be measured with a commercially available spectrophotometer, spectrophotometer, or the like.
Among the white colors, particularly whitish colors are expressed by the Munsell color system, the color is 9.0 or more in brightness and 1.0 or less in saturation, and the whitish color is lightness. Is a color with 9.0 or more and saturation of 1.0 or less.

The light-shielding property of the light-shielding layer 2 can be measured with a spectrophotometer. From the light-transmitting substrate 1 side to the light-shielding layer 2 in a state where the wiring 3 and the dummy pattern 4 are not formed on the surface of the light-shielding layer 2. The intensity of the transmitted light of the incident light is measured.
The color of the light-shielding layer 2 can also be measured with a spectrophotometer, and is incident on the light-shielding layer 2 from the translucent substrate 1 side without the wiring 3 or the dummy pattern 4 formed on the surface of the light-shielding layer 2. Measured with reflected light. Measurement with reflected light is performed under the condition of specular reflection removal (SCE).

(Formation of light shielding layer 2)
Although the method for forming the light shielding layer 2 is not particularly limited in the present invention, the light shielding layer 2 contains a colored pigment in a resin binder containing an uncured product of the curable resin. It can be formed by a functional resin composition.
The colored curable resin composition further contains a solvent for adjusting the coating suitability when the resin composition is applied onto the surface of the light-transmitting substrate 1 or the printing suitability when printing. be able to. A well-known thing can be used suitably for a solvent.

  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.
After applying the colored curable resin composition, patterning is performed on a part of the surface of the translucent substrate 1 by performing a predetermined process such as exposure, development, and baking using a photolithography technique. A light shielding layer 2 having a pattern can be formed.

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

(Multi-layer shading layer 2)
The light shielding layer 2 may be a single layer, but in the present invention, the light shielding layer 2 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 convenient three colors. If one light-shielding layer 2 is formed with a thickness of 1.5 μm, three layers can be sufficiently formed with 4.5 μm, and the entire light-shielding layer 2 with a thickness of 6 μm or less.

[Wiring 3]
The wiring 3 is formed as an opaque conductor layer. For example, in the touch panel application, the wiring 3 can connect a transparent electrode formed from the display area A1 to the opaque area A2 to the control circuit.
In the present embodiment, the wiring 3 is formed for a touch panel. As shown in FIGS. 1 and 2, the lead-out portion of the projected capacitive transparent electrode 5 extends to the wiring 3 in the opaque region A2, Connected.
In the present invention, the wiring 3 may be a wiring for connecting an optical sensor to a control circuit in a detection method that does not use a transparent electrode, for example, an optical method, even for the same touch panel application.

Thus, the use of the wiring 3 is not particularly limited in the present invention. The wiring 3 may be, for example, a conductor pattern such as a wiring to a sensor such as an infrared sensor or a brightness sensor, an antenna, and a non-contact charging coil.
When the wiring 3 is linear, the line width may not be constant.

Known materials and forming methods can be used for the wiring 3. For example, the wiring 3 can be made of metal (including alloys thereof) such as silver, gold, copper, chromium, platinum, aluminum, palladium, and molybdenum. For example, the wiring 3 can be formed as a metal layer of a silver alloy (also referred to as APC) made of silver, palladium, and copper by sputtering and then patterned by photolithography.
For the wiring 3, molybdenum (Mo) / aluminum (Al) / molybdenum (Mo) and a three-layered conductive layer (called MAM) can also be used.
The metal layer can be formed by a known thin 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. .
In the case of a metal thin film layer, the thickness of the wiring 3 can be set to, for example, about 0.3 to 2 μm.

There is no restriction | limiting in particular as a formation method of the wiring 3, You may form by printing methods, such as a screen printing method and an inkjet printing method, besides the photolithography method.
However, it is preferable to form the metal thin film layer by photolithography because it can be thinned to 1 μm or less, for example, and can be formed with high definition.
In the present embodiment, the wiring 3 is formed by sputtering as a silver alloy (APC) metal layer made of silver, palladium and copper, and then patterned by photolithography.

  In the present invention, “opaque” of the wiring 3 means that it does not transmit visible light at all, as can be seen from the above-described materials. However, in terms of the transmittance described in the light shielding layer 2, Even if it is large, it may be said that the transmittance is 0.1% or less (optical density OD3.0 or more), preferably 0.01% or less (optical density OD4.0 or more).

[Dummy pattern 4]
The dummy pattern 4 is formed on the same surface as the surface on which the wiring 3 is formed on the surface of the light shielding layer 2 where the wiring 3 is not formed.
The dummy pattern 4 is formed of the same material as the wiring 3. Therefore, the dummy pattern 4 is formed as an opaque conductor layer. In the present embodiment, the dummy pattern 4 is formed simultaneously with the wiring 3.
The gap between the dummy pattern 4 and the wiring 3 is preferably as narrow as possible because the dummy pattern 4 and the wiring 3 are easily visible as a continuous layer integrally. For this reason, depending on the distance at which the front protective plate 10 for a display device with wiring is visually recognized, the gap between the dummy pattern 4 and the wiring 3 is 50 μm or less, preferably 30 μm, when viewed at a reachable position. Hereinafter, it is more preferably 20 μm or less, and further preferably 15 μm or less. However, if the gap is too narrow, shorts and leaks are likely to occur. Therefore, the gap should be 5 μm or more, preferably 10 μm or more.
The gap between the dummy pattern 4 and the wiring 3 may or may not be constant.

For the dummy pattern 4, known materials and forming methods can be employed. For example, the dummy pattern 4 can be made of metal (including alloys thereof) such as silver, gold, copper, chromium, platinum, aluminum, palladium, and molybdenum. For example, the dummy pattern 4 can be formed as a metal layer of a silver alloy (also referred to as APC) made of silver, palladium, and copper by a sputtering method and then formed by a photolithography method.
As the dummy pattern 4, a conductive layer (referred to as MAM) having a three-layer structure of molybdenum (Mo) / aluminum (Al) / molybdenum (Mo) can also be used.
The metal layer can be formed by a known thin 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. .
In the case of a metal thin film layer, the thickness of the dummy pattern 4 can be set to, for example, about 0.3 to 2 μm.

There is no restriction | limiting in particular as a formation method of the dummy pattern 4, You may form by printing methods, such as a screen printing method and an inkjet printing method, besides the photolithography method.
However, it is preferable to form the metal thin film layer by photolithography because it can be thinned to 1 μm or less, for example, and can be formed with high definition.
In the present embodiment, the dummy pattern 4 is formed at the same time as the wiring 3. Therefore, after forming a metal layer of silver alloy (APC) made of silver, palladium, and copper by sputtering, the pattern is formed by photolithography. Is formed.

(Dummy pattern 4 potential)
The dummy pattern 4 is insulated from the adjacent wiring 3. However, the dummy pattern 4 may be connected to the ground. When the dummy pattern 4 connected to the ground serves as a feedback path for a signal flowing through the wiring 3, the dummy pattern 4 can be said to be a kind of the wiring 3. However, the wiring 3 is usually always formed in a linear shape with a constant line width, whereas the dummy pattern 4 does not always have a constant line width even if there is a portion formed in a linear shape. It is different from the wiring 3 in that there is no point.
The dummy pattern 4 may be connected to a case or chassis of a display device in which the front protective plate 10 for a display device with wiring is incorporated.
The dummy pattern 4 may be one in which some or all of the plurality of dummy patterns 4 separated from each other are electrically floating. When the entire periphery of the dummy pattern 4 is surrounded by the wiring 3 or when it is surrounded by the wiring 3 and the display area A1, the dummy pattern 4 is electrically connected unless a special electrical connection means is introduced. It will be something that floated.

(Dummy pattern 4 non-formation part)
The dummy pattern 4 need not always be formed so as to be adjacent to the wiring 3 leaving a gap on the entire surface of the light shielding layer 2 where the wiring 3 is not formed. For example, the non-formation part of the dummy pattern 4 may be provided in an arbitrary shape in the part of the infrared transmission window as a part through which infrared light for detection of the infrared sensor passes.
If the infrared transmission window is shown by borrowing the drawing of the conventional front protective plate 40 for a display device shown in FIG. 8, the portion indicated by the symbol IR is the infrared transmission window IR.

(Advantage of forming dummy pattern 4 with the same material as wiring 3)
By the way, from the viewpoint of making the wiring 3 formed on the back side of the light shielding layer 2 inconspicuous, it is sufficient that the dummy pattern 4 has the same appearance as the wiring 3. Although different from the configuration of the present invention, as an extreme solution, the back side of the light shielding layer 2 has the same pattern as the light shielding layer 2 as in the front protective plate 60 for a display device with wiring shown in the partial enlarged sectional view of FIG. Even if an opaque backing layer 2B is formed on the surface of the backing layer 2B, the wiring 3 can be made inconspicuous. The backing layer 2B may be conductive like a metal layer or non-conductive like a black resin layer. In the figure, since the backing layer 2B is conductive, the wiring 3 is formed on the backing layer 2B via the insulating layer 6. For this reason, two additional processes are required as a process for forming the backing layer 2B and the insulating layer 6, which increases the cost.

  From the viewpoint of omitting the insulating layer 6, if the dummy pattern 4 is also formed on the surface on which the wiring 3 is formed, the insulating layer 6 can be omitted even if the dummy pattern 4 is conductive. However, even if the dummy pattern 4 and the wiring 3 have the same appearance, if the dummy pattern 4 and the wiring 3 are formed of different materials, an additional step of forming the dummy pattern 4 is necessary in addition to the step of forming the wiring 3. In this case, it is necessary to register the dummy pattern 4 and the wiring 3 at the time of patterning, and the gap between the dummy pattern 4 and the wiring 3 needs to take into account errors at the time of registration. Of course, the dummy pattern 4 may be formed of an insulating material. However, if the material has an appearance similar to that of the wiring 3, for example, a material having a metal color, the relationship between the object color and the conductivity of the object turn into. When the dummy pattern 4 is formed of a conductive material, an additional process is required when the same pattern is simultaneously formed in the same process, rather than in a separate process using a material different from the wiring 3. In addition, there is an advantage that the mutual positional accuracy can be formed with high accuracy.

  Further, since the dummy pattern 4 is made of the same material as that of the wiring 3, the wiring 3 is formed of a metal material as described above and exhibits a metal color, and the dummy pattern 4 also exhibits a metal color. For example, the dummy pattern 4 and the wiring 3 formed of APC, silver, aluminum, or the like have a silver color as a metal color. As a result, for example, when the light shielding layer 2 has a white color such as white, the reflected light from the dummy pattern 4 and the wiring 3 is added to the color of the light shielding layer 2 itself, thereby increasing the whiteness of the light shielding layer 2. You can also. Alternatively, when gold is used for the dummy pattern 4 and the wiring 3, gold can be added to the color of the light shielding layer 2 as a metal color. Thus, the appearance color of the dummy pattern 4 and the wiring 3 can be used for decoration by the light shielding layer 2.

  By the way, in terms of making the wiring 3 difficult to see through the light shielding layer 2 having insufficient light shielding properties, the wiring 3 can be made difficult to see by forming the wiring 3 with a transparent conductive thin film such as ITO. However, in this case, since the wiring 3 formed of the transparent conductive thin film has transparency and poor light shielding property, the lack of light shielding property of the light shielding layer 2 cannot be compensated.

[Transparent electrode 5]
In the embodiment of the front protective plate 10 for a display device with wiring shown in FIG. 1 to FIG. 3, on the surface of the first surface S1 on the side where the light shielding layer 2, the wiring 3 and the dummy pattern 4 are formed, further for the touch panel. The transparent electrode 5 is formed. The transparent electrode 5 for a touch panel here is a projection type capacitive electrode.

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

In the present invention, the front protective plate 10 for a display device with wiring that integrates all the functions necessary as a touch panel can be said to be a touch panel. The front protective plate 10 for a display device with wiring in which a part of functions necessary as a touch panel is integrated can be said to be a touch panel member. In this respect, when the wiring 3 is for a touch panel, the front protective plate 10 for a display device with wiring can be said to be a touch panel member.
When a part of the touch panel function is integrated, for example, in a system that requires the position detection transparent electrode 5 as the touch panel function, the transparent electrode 5 can be integrated. Various types of touch panel position detection methods are conventionally known. In the position detection method in which the transparent electrode 5 has two layers, it is desirable to integrate at least one of these layers, more preferably two layers.
In the present embodiment, the transparent electrode 5 is formed by integrating two layers.

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

(Mesh electrode)
In the present invention, as the transparent electrode 5, a pseudo-transparent mesh electrode is formed by forming a conductive layer having an opaque layer itself as a fine line of 50 μm or less, more preferably 30 μm or less. It can also be used. As such a conductor layer, the materials described in the wiring 3 can be used. In this case, the transparent electrode 5 can be formed of the same material as the wiring 3 and can be formed simultaneously. In the mesh electrode, a thin portion such as an extraction portion, which originally has a line width of 30 μm or less, may not be formed in a mesh shape.

[Deformation]
The front protective plate 10 for a display device with wiring of the present invention may take other forms other than the above-described forms. Some of these will be described below.

In the embodiment shown in FIG. 1, the front protective plate 10 for a display device with wiring has a translucent substrate 1, a light shielding layer 2, wiring 3, and a dummy pattern 4. 3 is an example in which 3 is made inconspicuous and the light shielding property of the light shielding layer 2 is compensated for by the wiring 3 and the dummy pattern 4.
Further, in the embodiment shown in FIG. 1, the front protective plate 10 for a display device with wiring is an example in which the transparent electrode 5 for a touch panel is also included. That is, the front protective plate 10 for a display device integrated with a touch panel.
However, other components may be further provided in the present invention. Hereinafter, some of them will be described.

[Insulation layer]
Like the front protective plate 10 for a display device with wiring shown in FIG. 5, the surface on which the wiring 3 and the dummy pattern 4 are formed in contact with each other may be the surface of the insulating layer 6. The insulating layer 6 in the modified form of the figure is an example formed only on the surface of the light shielding layer 2 so as to cover the entire light shielding layer 2. For this reason, the insulating layer 6 may be opaque.
Insulating layer 6 improves when insulation between wiring 3 and dummy pattern 4 is insufficient when wiring 3 and dummy pattern 4 are formed directly on the surface of light shielding layer 2 without insulating layer 6 interposed therebetween. can do. Further, when the surface of the light shielding layer 2 is rough, this can be smoothed.
Although not shown, when the insulating layer 6 is formed up to the display area A1, the insulating layer 6 is transparent. By forming the insulating layer 6 including the display region A1, a step due to the light shielding layer 2 can be reduced.

In the case of using a resin for the insulating layer 6, a curable resin is preferable 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. Such an insulating layer 6 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 light shielding layer 2 can be used. In the case of a photosensitive resin, a photolithography method can be used when partially forming.
The insulating layer 6 can also use an inorganic material such as silicon oxide.

  Although not shown, the insulating layer 6 is a projected capacitive transparent electrode having a structure in which two layers of electrodes are formed on the same surface in the embodiment described with reference to FIGS. 1 and 2. 5, the electrode is also used to insulate the intersections between the electrodes extending in the vertical direction of the drawing and the electrodes extending in the horizontal direction of the drawing. Since this is a known structure, further explanation is omitted.

[Overcoat layer 7]
An overcoat layer 7 may be formed on the surface after the wiring 3 and the dummy pattern 4 are formed, like the front protective plate 10 for a display device with wiring shown in FIG. The overcoat layer 7 in the modified form of the figure is an example formed including the opaque region A2 having the light shielding layer 2 and the display region A1. For this reason, the overcoat layer 7 is formed as a transparent layer so as not to hinder display.
The overcoat layer 7 can improve insulation and scratch resistance.

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. The overcoat layer 7 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 light shielding layer 2 can be used. In the case of a photosensitive resin, a photolithography method can be used when partially forming.

[Visible information 8]
Referring to FIG. 8 referred to as the conventional front protection plate 40 for a display device, in the present invention, the front protection plate 10 for a display device with wiring is formed in an opaque region A2 where the light shielding layer 2 is formed. Visible information 8 can be provided. The visible information 8 is any visually observable information such as a product logo, an operation explanation character, symbol, or pattern in the opaque area A2.
The visible information 8 is provided, for example, on the back side of the light shielding layer 2 as a non-formed part of the light shielding layer 2 by a layer having a different appearance and color from the light shielding layer 2 so that it can be seen from the front side of the light transmissive substrate 1. Examples of the layer having a different appearance and color from the light shielding layer 2 include a colored resin layer and a metal layer.

[C] Display device:
The display device according to the present invention includes the above-described front protective plate 10 for a display device with wiring and a display panel. Furthermore, if the front protective plate 10 for display device with wiring does not have a touch panel function, a touch panel is also provided. A display device provided.
That is, the display device according to the present invention includes the above-described front protective plate 10 for a display device with wiring, a touch panel, and a display panel.
Or it is the structure provided with the front protection board 10 for wiring-equipped display apparatuses which also has the transparent electrode 5 for touch panels, and the display panel.

FIG. 6 shows an embodiment of a display device according to the present invention. The display device 100 shown in FIG. 6 is a front protective plate 10 for a display device with wiring, a display panel 30 in order from the front side on the viewer V side above the drawing. It has.
In this embodiment, the front protective plate 10 for a display device with wiring is the front protective plate 10 for a display device with wiring according to the present invention described above. More specifically, in this front protective plate 10 for a display device with wiring, as a part of the touch panel function, the wiring 3 is for a touch panel, and further has a transparent electrode 5. The transparent electrode 5 is a projected capacitive electrode as shown in FIGS. 1 and 2.

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

With the display device 100 having the above-described configuration, the front protective plate 10 for a display device with wiring in which the wiring 3 for the touch panel and the transparent electrode 5 included in the display device 100 are integrated. Even if the light shielding property is insufficient, the wiring behind the light shielding layer can be made inconspicuous.
Moreover, since the dummy pattern 4 for making the wiring 3 inconspicuous is formed simultaneously with the same material as the wiring 3, even if the dummy pattern 4 is added, it can be manufactured without increasing the number of processes. Thus, the dummy pattern 4 can be provided while avoiding an increase in cost. 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 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 wiring integrated with touch panel function]
In the display device 100 according to the embodiment illustrated in FIG. 6, the front protection plate 10 for a display device with wiring is a projection capacitive type capable of detecting the position only on one surface in addition to the wiring 3 as a part of the touch panel function. The transparent electrode 5 formed as a pattern was also integrated.
However, in the present invention, although not shown, the touch panel to be incorporated is of a type provided with a transparent electrode, and this transparent electrode is of a resistive film type, for example, and is insulated from each other. When the two layers of the first transparent electrode 5 and the second transparent electrode 5 are formed on different substrates, one of these substrates is used as a front protective plate for a display device with wiring. The light-transmitting substrate 1 can be used in combination with the ten translucent substrates 1. The substrate on which the other transparent electrode 5 is formed is incorporated as a touch panel constituent member separate from the front protective plate 10 for display device with wiring and the display panel 30 to constitute the display device 100.
With such a configuration, the degree of freedom in product design can be increased.

  The front protective plate 10 for a display device with a wiring having a transparent electrode 5 for a touch panel is assumed that all of touch panel functions such as a control circuit and a connector for electrically connecting the control circuit and the wiring 3 are integrated. Also good. Of course, in this case, when using the front protective plate 10 for a display device with wiring in which all the functions of the touch panel are integrated, it is not necessary to provide an independent touch panel, and the front protective plate 10 for display device with wiring, The display device 100 is configured to include at least 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 kind of structure integrates the front surface protection board 10 for wiring-equipped display apparatuses, and a touchscreen function.

[Front protective plate 10 for display device with wiring that does not integrate touch panel function]
Although not shown, the wiring 3 included in the front protective plate 10 for a display device with wiring includes, for example, a front protection plate 10 for a display device with wiring, a touch panel, and a display panel that are not integrated with the touch panel for sensor connection. 30 may constitute the display device 100.

  The touch panel is typically a projected capacitive touch panel capable of multi-touch (multi-point simultaneous input), but in addition, a surface capacitive touch panel, a resistive touch panel, an electromagnetic induction system, Any of various known position detection touch panels including a position detection method that does not require the transparent electrode 5 such as an optical method may be used.

[Interposition of resin layer such as adhesive sheet]
The display device 100 according to the embodiment illustrated in FIG. 6 has a structure in which an air layer exists between the front protective plate 10 for a display device with wiring and the display panel 30. May be filled with a resin layer such as an adhesive layer between the front protective plate 10 for a display device with wiring and the display panel 30. Moreover, in the form provided with a touch panel, it is the same between the touch panel and the display panel 30.

  An adhesive sheet can be used for the resin layer. As such an adhesive sheet, an acrylic adhesive, a polyester adhesive, an epoxy adhesive, a silicone adhesive, or the like can be used.

[D] Application:
Applications of the front protective plate 10 for a display device with wiring 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 2B Backing layer 3 Wiring 4 Dummy pattern 5 Transparent electrode 6 Insulating layer 7 Overcoat layer 8 Visible information 9 Light shielding layer 9B Black type light shielding layer 9W White type light shielding layer 10 For display apparatus with wiring Front protective plate 20 Touch panel 30 Display panel 40 Front protective plate for display device (conventional) 50 Front protective plate for conventional display device with wiring 60 Front protective plate for display device with wiring 100 Display device 200 Conventional display device IR Infrared Transmission window A1 Display area A2 Opaque area L1, L2 Light S1 First surface S2 Second surface V Observer

Claims (5)

A front protective plate for a display device with wiring, having a central display region and an opaque region provided on an outer peripheral portion of the display region to shield visible light, and having opaque wiring in the opaque region ,
A translucent substrate;
A light shielding layer provided in the opaque region on one surface of the translucent substrate;
The wiring provided on the surface of the light shielding layer;
A dummy pattern formed on the surface of the light-shielding layer and on the surface where the wiring is formed, on the portion where the wiring is not formed, separated from the wiring and formed of the same material as the wiring;
Having at least
Thickness of the light shielding layer is Ri 0.5~6μm der,
The light shielding layer is a white color,
The front protective plate for a display device with a wiring , wherein an interval between the dummy pattern and the wiring is 5 μm or more and 50 μm or less .   The front protective plate for a display device with a wiring according to claim 1, wherein the light shielding layer has a transmittance of 0.01% or more.   The front protective plate for a display device with a wiring according to claim 1, wherein the dummy pattern is connected to a ground.   A transparent electrode for detecting the position of the touch panel is further provided on one surface of the translucent substrate so as to extend from the display region to the portion of the light shielding layer in the opaque region. The front protective plate for a display device with a wiring according to any one of claims 1 to 3, which is electrically connected to the wiring at a portion. Whether the front protective plate for a display device with a wiring according to any one of claims 1 to 3, a touch panel, and a display panel,
Or, comprising the front protective plate for a display device with wiring having a transparent electrode for a touch panel according to claim 4, and a display panel,
Display device.