JP6530582B2 - Substrate for protective plate, front protective plate for display device with electrode, and display device - Google Patents

Description

  The present invention relates to a substrate for a protective plate, a front protective plate for a display device with an electrode, and a display device.

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

FIG. 12 is a view schematically showing an example of a display device 200 provided with the touch panel 20. As shown in FIG. FIG. 12 (a) is an exploded plan view, and the cross-sectional view of FIG. 12 (b) is a sectional view of FIG. 12 (a) when the front surface protective plate 40 for a display device is cut along line C-C. It is sectional drawing of only the front surface protective plate 40 for display devices. The touch panel 20 is disposed on the front side (the front side in the drawing) which is the light emission side of the display light from the display panel 30 with respect to the display panel 30. Furthermore, in order to protect the touch panel 20, a front protection plate 40 for a display device is disposed on the front side of the touch panel 20, which is a side on which display light from the display panel 30 passes through the touch panel 20 and emits light. 1, Patent Document 2, Patent Document 3).
Generally, as shown in FIG. 12, the outer peripheral portion of the display area A1 is an opaque area A2, and the front surface protective plate 40 for a display device is shielded against the light transmitting glass substrate 41 in the opaque area A2. Layer 42 is formed. The opaque area A2 prevents the touch panel 20 disposed on the back side of the display device front protection plate 40 from seeing the wiring 6 or the connector or the like on the outer peripheral portion and damaging the appearance. In the opaque area A2, visible information 8 such as a product logo, an infrared transmission window, and a window such as a notification window indicating the state of the apparatus are appropriately provided. The opaque area A2 is formed by adding the front protection plate 40 for a display It is also a decorative part.

In addition, in order to meet the demands for thinning, weight reduction, reduction in the number of parts, etc., various integrations such as integration of the front face protection plate 40 for display device with the touch panel 20 or integration of the touch panel 20 with the display panel 30 Forms have been proposed and are beginning to hit the market (Patent Document 1, Patent Document 2).
FIG. 13 illustrates a front protection plate 40 for a display device in which a light shielding layer 42 is provided on the translucent glass substrate 41 illustrated in FIG. 12B as an example of integration of the front protection plate 40 for a display device and the touch panel 20. On the other hand, it is a structural example of the front surface protective plate 50 for the display apparatus with electrodes which provided transparent electrode 4 and touch wiring 6 for touch panels further.
In addition, in the example of the front surface protective plate 50 for a display with an electrode shown to the same figure, it also has the overcoat layer 7 which coat | covers the transparent electrode 4 and the wiring 6 in order to improve reliability.

  Moreover, since the translucent glass substrate 41 is disposed on the outermost surface of the display device, in order to make it difficult to break from the viewpoint of safety etc., the use of chemically strengthened glass having an increased strength is increasing. (Patent Document 4).

JP, 2009-193587, A Utility model registration No. 3153971 gazette JP 2008-266473 A (FIG. 2) Unexamined-Japanese-Patent No. 2004-83378

  However, if the transparent electrode 4 of ITO (Indium Tin Oxide; Indium Tin Oxide) is directly formed on the surface of the translucent glass substrate 41 using chemically tempered glass, the intrinsic strength of the chemically tempered glass is significantly increased. It turned out to decline.

  Therefore, the object of the present invention is to provide a substrate for a protective plate and a front protective plate for a display device with an electrode capable of improving the strength of a translucent chemically strengthened glass substrate using a chemically strengthened glass, and a front protective plate for a display device with the electrode Providing a display device having the

In the present invention, a substrate for a protective plate, a front protective plate for a display device with an electrode, and a display device having the following configuration are provided.
(1) Translucent chemical tempered glass substrate,
A resin layer provided on any one of the first surface of the light-transparent chemically strengthened glass substrate and the second surface opposite to the first surface;
And a substrate for a protective plate for a display device.
(2) The substrate for a protective plate of (1), wherein the resin layer has a compressive stress.
(3) A front surface protection for a display with an electrode, which has a central display area and an opaque area provided on the outer peripheral portion of the display area to shield visible light, and having a transparent electrode at least in the display area. A board,
Translucent chemical tempered glass substrate,
A light shielding layer provided in the opaque area on any one of the first surface of the light-transmitting chemically strengthened glass substrate and the second surface opposite to the first surface;
A resin layer provided on at least the display area on one surface of the light-transmissive chemically strengthened glass substrate;
The transparent electrode provided on the surface of the resin layer on at least one of the display region on one surface of the translucent chemically strengthened glass substrate;
A front protective plate for a display device with an electrode.
(4) The front protective plate for a display device with an electrode according to (3), wherein the resin layer has a compressive stress.
(5) Display panel,
The front protective plate for a display device with an electrode according to (3) or (4), which is disposed on the front side of the display panel where the display light is emitted;
A display device comprising at least

  According to the present invention, there are provided a substrate for a protective plate and a front protective plate for a display device with an electrode capable of improving the strength by the light-transmitting chemically strengthened glass substrate, and a display device provided with the front protective plate for a display device with the electrode. be able to.

BRIEF DESCRIPTION OF THE DRAWINGS Sectional drawing explaining one Embodiment of the board | substrate for protective plates by this invention. The figure explaining the effect | action in which intensity | strength is improved by the compressive stress of a resin layer. Explanatory drawing explaining a falling ball test as an evaluation method of intensity | strength. The graph which shows an example of a falling ball test result. BRIEF DESCRIPTION OF THE DRAWINGS The top view (a) explaining one Embodiment of the front surface protection plate for display apparatus with electrodes by this invention, Sectional drawing in the C-C line in a top view (b). The top view (a) and sectional drawing (b) which demonstrate an example of a pattern of a transparent electrode mainly on the intersection part. Sectional drawing which illustrates the modification (resin layer of the area | region main body for a display) of the front surface protection plate for display devices with electrodes by this invention. Sectional drawing which illustrates the deformation | transformation form (The resin layer of a light shielding layer and a formation order is reverse) by the display panel for electrodes with a display apparatus by this invention. Sectional drawing which illustrates the modification (with an overcoat layer) of the front surface protective plate for display devices with electrodes by this invention. Sectional drawing which illustrates typically one Embodiment (all integration of the transparent electrode for touch panels) of the display apparatus by this invention. Sectional drawing which illustrates typically another embodiment (a part integration of the transparent electrode for touch panels) of the display apparatus by this invention. The disassembled top view (a) which shows an example of the conventional front surface protective plate for display devices, and a display device, Sectional drawing (b) of the front surface protective plate for display devices in line CC in an exploded plan view. Sectional drawing which shows an example of the conventional front surface protection plate for display apparatuses with electrodes.

    Hereinafter, embodiments of the present invention will be described with reference to the drawings. The drawings are conceptual diagrams, and the scale relationships, aspect ratios, and the like of components may be exaggerated as appropriate depending on the convenience of the description.

[A] Definition of terms:
In the following, definitions of major terms used in the present invention are explained here.

The “front side” refers to a front protective plate for a display with an electrode provided with a transparent electrode with respect to a substrate for a protective plate, or another component, in which a front protective plate for a display with an electrode is combined with a display panel When it is the side from which the display light from the display panel is emitted, it means the side on which the display of the display panel is observed.
The "back side" means the opposite side to the "front side", and means the side on which the display light of the display panel enters in the front protective plate for a display with an electrode or other components.
Either of the “first surface” and the “second surface” is the “front side”, and which surface is the “front side” is arbitrary.
As for the "one side" and the "other side" which is the opposite side, it is basically arbitrary which side is the "front side" and which side is the "front side". In the present invention, the surface on the side having the resin layer capable of improving the reduction in strength at the time of forming the transparent electrode with respect to the light transmitting chemically strengthened glass substrate is referred to as "one surface". The face is the face used as the back side. The "one side" or the "back side" is also referred to as the "second side", and the "other side" or the "front side" is also referred to as the "first side".

[B] Protective plate substrate:
First, a protective plate substrate according to the present invention will be described.
The cross sectional view of FIG. 1 shows an embodiment of a protective plate substrate according to the present invention.

The protective plate substrate 10B of the embodiment shown in FIG. 1 includes a translucent chemically strengthened glass substrate 1, a first surface S1 of the translucent chemically strengthened glass substrate 1, and a second surface opposite to the first surface S1. It is a substrate having a structure having the resin layer 2 provided on the surface of the second surface S2 as one of the surfaces S2 and is suitable for the front protective plate for a display device with an electrode described later. It is a substrate. In the figure, the upper surface of the drawing is the first surface S1, and the lower surface of the drawing is the second surface S2. The first surface S1 is a front surface when the transparent electrode 4 is formed and becomes a front surface protection plate for a display device, and is a surface on the side of the observer V who observes the display on the display panel.
In the present embodiment, the resin layer 2 is formed on the entire surface in contact with the surface of the second surface S2 which is the back side when the protective plate substrate 10B becomes the front protective plate for a display device with an electrode. . Moreover, in the present embodiment, the resin layer 2 is formed as a layer having a crosslinked structure and a compressive stress as a cured product layer of a curable resin.

  With such a configuration, the strength of the light-transmissive chemically strengthened glass substrate can be improved. Specifically, when the protective plate substrate 10B is provided with the transparent electrode 4 indicated by a dotted line in the drawing and it is used as a front protective plate for a display device with an electrode integrated with a touch panel function for detecting a position of a touch panel, for example. Is provided on the surface of the resin layer 2 to improve the reduction in the strength of the intrinsically transparent glass substrate 1 that occurs when the transparent electrode 4 is provided directly on the surface of the glass substrate 1 It is possible to In addition, it is also possible to further increase the strength that the light-transmissive chemically strengthened glass substrate 1 originally has. Moreover, when the transparent electrode 4 is not provided, the intensity | strength of translucent chemical-strengthening glass substrate 1 itself can be strengthened more.

  Hereinafter, each component will be described in more detail.

[Transparent Chemically Tempered Glass Substrate 1]
The translucent chemically strengthened glass substrate 1 is a glass substrate made of chemically strengthened glass that is transparent to at least visible light. There is no restriction | limiting in particular as a chemical strengthening glass, Well-known inorganic glass, such as soda lime glass, aluminosilicate glass, borosilicate glass, can be used. Chemically strengthened glass is typically a glass whose mechanical strength is enhanced by a chemical method of partially exchanging ionic species, such as replacing sodium with potassium having a larger ionic radius, in the vicinity of the surface of the glass. As a result, since the chemically strengthened glass has a compressive stress layer having a compressive stress in the vicinity of the surface, it is difficult to be broken by an external force, and has an advantage that the thickness can be reduced accordingly.
The thickness of the translucent chemically strengthened glass substrate 1 may be a thickness according to the application and the required specifications,
For example, it is 0.1 to 2.0 mm, usually 0.5 to 1.0 mm, typically 0.7 mm.

  It should be noted that it is confirmed by a commercially available surface stress measuring device, for example, FSM-6000 manufactured by Orihara Mfg. Co., Ltd., that the translucent chemically strengthened glass substrate 1 has a compressive stress layer having compressive stress in the vicinity of the surface. Can.

[Resin layer 2]
The resin layer 2 is a layer formed of a resin, and is a layer transparent to at least visible light. When the transparent electrode 4 shown by a dotted line in FIG. 1 is provided on the transparent chemically strengthened glass substrate 1 by the resin layer 2, the transparent electrode 4 is formed by transparent chemical strengthening by being provided on the surface of the resin layer 2. Direct contact with the surface of the glass substrate 1 can be avoided. As a result, it is possible to improve the reduction in strength when the transparent electrode 4 is provided on the translucent chemically strengthened glass substrate 1. Further, in the case where the transparent electrode 4 is not provided, the strength of the light-transmissive chemically strengthened glass substrate 1 can be further increased.

The resin layer 2 is preferably insulating. In the present invention, the resin layer 2 is usually formed as an insulating layer. Also in the present embodiment, the resin layer 2 is formed as an insulating layer.
This is because in the present embodiment, as shown in FIG. 1, it is assumed that the transparent electrode 4 is formed in contact with the surface of the resin layer 2. Therefore, the resin layer 2 is required to have insulation so that the transparent electrodes 4 to be electrically insulated from each other are not conducted by the resin layer 2.

The resin layer 2 preferably has a compressive stress. In the present embodiment, the resin layer 2 is formed as a cured product layer of a curable resin, and curing shrinkage upon curing, drying shrinkage upon solvent drying when formed with a resin composition containing a solvent, etc. , Compressive stress.
When the transparent electrode 4 is further provided on the protective plate substrate 10B by the resin layer 2 having a compressive stress to form a front protective plate for a display device with an electrode, the transparent electrode 4 is placed on the surface of the resin layer 2 By providing it, the substrate 10B for a protective plate or the front protective plate for a display device with an electrode is cracked against an external force applied to press the first surface S1 on the first surface S1 on the side where the resin layer 2 is not formed. It can be difficult. Moreover, when the transparent electrode 4 is not provided, the intensity | strength of translucent chemical-strengthening glass substrate 1 itself can be strengthened more.

The resin layer 2 preferably has a crosslinked structure. In the present embodiment, the resin layer 2 has a crosslinked structure. A crosslinked structure can be formed by utilizing a crosslinking curing reaction as a curing reaction when forming the resin layer 2 as a cured product layer of a curable resin. By setting it as the resin layer 2 which has a crosslinked structure, compressive stress can be more reliably given with respect to the resin layer 2 by the cure shrinkage by a crosslinking-hardening reaction.
In addition, the resin layer 2 having a crosslinked structure has an advantage that the resin layer 2 can be easily provided with heat resistance that can withstand heating when the transparent electrode 4 is formed on the surface of the resin layer 2.

The resin layer 2 is preferably non-adhesive. In the present embodiment, the resin layer 2 is non-adhesive. It is stuck on the surface glass (front protection plate for display devices) of the mobile phone, and the adhesive layer of the surface protection adhesive film that protects the surface, that the resin layer 2 is tacky, on the surface of the resin layer 2 It is because it becomes difficult to form the transparent electrode 4 in contact.
The pressure-sensitive adhesive layer of the surface protection pressure-sensitive adhesive film has a thickness of usually 20 μm or more in terms of impact resistance etc., but the resin layer 2 according to the present invention has a thickness of about 2 μm and at most about 5 μm. But different.

(Strength improvement action)
FIG. 2 is a view for explaining the action of compressive stress possessed by the resin layer 2 to improve the strength of the light-transmissive chemically strengthened glass substrate 1.
FIG. 2A shows a state in which an external force is applied when the hard ball M falls on the first surface S1 of the upper side of the drawing of the normal glass plate 43 in the horizontal state. By the external force, the glass plate 43 bends downward in the drawing, and a tensile stress is generated on the second surface S2 on the lower side of the drawing along the surface direction of the second surface S2. The glass sheet is generally weak to tensile stress, and when tensile stress is generated, cracking occurs.

FIG. 2 (b) shows the cross-sectional shape of the light-transmitting chemically strengthened glass substrate 1 alone in which the resin layer 2 is not formed, and which surface on the side of the first surface S1 and the surface on the side of the second surface S2. It is drawn as a state that is not warped.
In the translucent chemically strengthened glass substrate 1, as a result of the compressive stress of the compressive stress layer in the vicinity of the surface having the function of canceling the tensile stress that can be generated by the external force, the mechanical strength becomes strong and it is difficult to break.

FIG. 2C shows the shape of the protective plate substrate 10B in which the resin layer 2 having compressive stress is formed on the second surface S2 with respect to the translucent glass substrate 1. As shown in FIG. 2C, the protective plate substrate 10B has the resin layer 2 with respect to the shape of only the translucent chemically strengthened glass substrate 1 on which the resin layer 2 shown in FIG. 2B is not formed. The surface side of the second surface S2 on the formed side is contracted to be a concave surface by being contracted.
Even if the resin layer 2 has reverse tensile stress, as shown in FIG. 2D, the protective plate substrate 10B has the shape of only the translucent chemically strengthened glass substrate 1 shown in FIG. 2B. On the other hand, the surface side of the second surface S2 has a curved shape so as to extend and become a convex surface.

Thus, the shape of the protective plate substrate 10B is deformed with respect to the original light-transmitting chemically strengthened glass substrate 1 by the stress of the resin layer 2. Whether or not the resin layer 2 has a compressive stress can be confirmed by comparing the shapes before and after the resin layer 2 is formed. Regarding the protective plate substrate 10B on which the resin layer 2 has already been formed, whether or not the resin layer 2 has a compressive stress depends on the protective plate substrate 10B having the resin layer 2 and the resin layer 2 It can confirm by comparing with the later shape.
The resin layer 2 can be removed at a temperature of 100 ° C. or less by decomposing the resin of the resin layer 2 with an aqueous alkali solution or the like, but may be removed by another method.

  In a state in which the transparent electrode 4 and the wiring 6 and the like are further provided on the protective plate substrate 10B and it becomes a front protective plate 10 (see FIG. 5 (b) etc.) for a display device with electrodes described later It is confirmed whether the resin layer 2 has a compressive stress or not by comparing the shape in a state in which the transparent electrode 4 and the wiring 6 provided on the upper side are removed with the shape in a state in which the resin layer 2 is also removed. can do.

  Although the deformation of the translucent chemically strengthened glass substrate 1 or the substrate 10B for a protective plate due to the presence or absence of the resin layer 2 is not so much as visible with the naked eye but very slight, the change in the flatness of these surfaces should be measured. Then, it can be measured and confirmed whether the resin layer 2 has a compressive stress or a tensile stress. For this measurement, a commercially available flatness measuring machine, for example, Flatness Tester FT-900, manufactured by NIDEX Corporation, can be used. In the measurement, light is obliquely incident on the surface, and measurement is made from the amount of mutation of the interference fringes generated.

  Although FIG. 2 illustrates the case where the surface of the light-transmitting chemically strengthened glass substrate 1 when the resin layer 2 is not present is completely planar in order to simplify the description, when the resin layer 2 is not present. The stress of the resin layer 2 can be measured even if the light-transmissive chemically strengthened glass substrate 1 is slightly warped. It is because it measures by the shape difference of the shape when resin layer 2 exists, and the shape when it does not exist.

The reason why the strength is improved by the resin layer 2 is that the transparent electrode 4 has a tensile stress, and this tensile stress acts to cancel the compressive stress of the translucent chemically strengthened glass substrate 1 and thus the translucent chemical strengthening The strength due to the glass substrate 1 is reduced, and it is also considered that the reduction in strength due to the tensile stress due to the transparent electrode 4 is alleviated by interposing the resin layer 2 having a compressive stress.
In addition, it is also considered that the resin layer 2 may be formed after the transparent electrode 4 is formed, provided that the resin layer 2 having a compressive stress improves strength reduction when the transparent electrode 4 is formed. . In other words, it is also considered that the resin layer 2 may be formed on the transparent electrode 4 like the overcoat layer 7 described with reference to FIG. 13 as a conventional example. It is because it is the same in the point by which the compressive-stress layer of the resin layer 2 is further added to the 2nd surface S2 side in which the transparent electrode 4 is formed.
However, in the configuration in which the resin layer 2 is formed after the transparent electrode 4 is formed as shown in FIG. 13, it has been found that the reduction in strength when the transparent electrode 4 is formed can not be improved. This will be described later with reference to FIG. The reason is that although it is certain that the compressive stress of the resin layer 2 acts to reduce the tensile stress that can be generated by an external force, the transparent electrode 4 is not in direct contact with the translucent chemically strengthened glass substrate 1 It is considered that the configuration in which the resin layer 2 is provided at the position acts as a very important factor in the improvement effect to the strength reduction. However, it is not clear at this time why this is the case, but in the case where the transparent electrode 4 and the transparent chemically strengthened glass substrate 1 are in direct contact with each other, and the transparent electrode 4 is in direct contact with the transparent chemical strengthened glass substrate 1 It is also considered that the film quality of the transparent electrode 4 is changed due to the interaction between the transparent electrode 4 and the adjacent layer in the case of direct contact with the resin layer 2 instead.

(Formation region of resin layer 2)
Assuming that the front protective plate 10 for a display device with an electrode shown in FIG. 5 and the like described later is used as the application of the protective plate substrate 10B, the resin layer 2 is made of the transparent electrode 4 and the translucent chemically strengthened glass substrate 1 directly. The transparent electrode 4 is usually formed on the surface of the light shielding layer 3 in order to electrically connect to the opaque wiring 6 in the opaque area A2 in that the transparent electrode 4 is formed in a position where it functions so as not to contact. Therefore, the resin layer 2 is not essential in the area to be the opaque area A2. For example, as illustrated in FIG. 7 and FIG. 9 illustrated in a modification of the front surface protective plate 10 for a display with an electrode, the resin layer 2 may be formed mainly in the area to be the display area A1.
As described above, in the protective plate substrate 10B of the present invention, the resin layer 2 may not be formed on the entire surface of the light-transmissive chemically strengthened glass substrate 1.
However, as in the case of the protective plate substrate 10B of the present embodiment, the light transmitting property on the side on which the transparent electrode 4 is formed including the resin layer 2 and the area to be the opaque area A2 together with the display area A1. By forming on the entire surface of the second surface S2 which is one surface of the chemically strengthened glass substrate 1, it is possible to determine the transparent electrode 4 on which portion the transparent electrode 4 is to be formed as the protective plate substrate 10B. It is possible to cope with any pattern, and it is possible to obtain the advantage that the pattern formation of the resin layer 2 is unnecessary and the formation by a coating method or the like is possible.

(Materials and formation method)
For the resin layer 2, a curable resin is preferable in terms of heat resistance, and for example, an epoxy resin, an acrylic resin, a polyimide resin, etc. can be used, and a specific example is a thermosetting epoxy resin, An ultraviolet curable acrylic photosensitive resin or the like can be used.
In the present embodiment, the resin layer 2 is formed by photolithography using an acrylic photosensitive resin composition.

The resin layer 2 may be formed by a known method. For example, the resin layer 2 can be formed by a photolithography method by using a resin-based photosensitive resin as described above.
The thickness of the resin layer 2 is, for example, 0.5 to 5 μm, preferably 1 to 2 μm. When the thickness of the resin layer 2 is thinner than the above range, the strength improvement effect by the resin layer 2 with respect to the strength provided by the translucent chemically strengthened glass substrate 1 may not be sufficiently obtained, and the thickness of the resin layer 2 If it is thicker than the range, it may lead to an increase in cost, and when the resin layer 2 is partially patterned, the step of the resin layer 2 becomes large, and the step portion (in particular, it may be generated in the opaque area A2) Disconnection of the transparent electrode 4 may occur due to the step.

(Measurement method of strength improvement effect and its result example)
The improvement effect to the intensity | strength by the translucent chemically strengthened glass substrate 1 can be evaluated by a falling ball test, for example. FIG. 3 is a view for explaining an example of a falling ball test apparatus capable of performing a falling ball test.
In the falling ball tester of the same figure, a test piece Tp is placed at the center of an iron base 62 having a cylindrical hollow portion 61 with a diameter of 40 mm at the center of the upper surface. The test piece Tp has a square shape of 10 cm by 10 cm. In the test piece Tp, the surface on the lower side of the drawing near the ground is the surface on which the transparent electrode 4 is provided, and the upper surface is to prevent scattering at the time of glass breakage in consideration of safety at the time of measurement. , The scattering prevention film 63 is stuck.
The shatterproof film 63 does not have to be replaced for each falling ball during the test of the test strip Tp, and a new film may be used for each test strip Tp. As the shatterproof film 63, for example, a polyethylene terephthalate adhesive film having a thickness of 75 μm can be used. The scattering prevention film 63 is attached to the test piece Tp on the adhesive surface of the adhesive film.
The test piece Tp is fixed to the base 62 by a pressing plate 65 made of iron and having a square shape having a circular hole 64 with a diameter of 40 mm at the center along with the scattering prevention film 63. The test strip Tp is fixed by fixing a pressing plate 65, which sandwiches the test strip Tp with the base 62, to the base 62 with bolts 66 and nuts 67 at four places at the center of four sides.
Then, from a predetermined height H, the metal ball 68 is vertically dropped at the center of the test piece Tp. As the metal ball 68, a stainless steel ball having a mass of 50 g and a diameter of 20 mm is used.

There are no particular limitations on the evaluation method for the falling ball test. In the present invention, evaluation was made as follows.
A falling ball test is started from 10 cm for the height H to which the metal ball 68 is dropped, and when the test piece Tp is not broken, the height H is increased by 10 cm at 20 cm, 30 cm, 40 cm, and so on. Repeat the test up to a height H of up to 160 cm. The number of tests n at the same height H is ten.

FIG. 4 shows an example of the result of the falling ball test. In the graph of the figure, the horizontal axis is the potential energy [J] of falling balls, and the vertical axis is the destruction rate [%]. The potential energy [J] is the mass m [kg] of the metal ball 68 and the height H [m], and the potential energy [J] = mass m [kg] × gravity acceleration g 9.81 [m / s ² ] × It can be determined as the height H [m]. The failure rate [%] is a percentage of the number of broken test pieces Tp relative to the number n10 of tests. For example, if the ball is broken 6 times for 10 times of falling balls, the destruction rate will be 60%. In the figure, the potential energy 0.78 [J] corresponds to the height H of 1.6 [m].

  The marks in the graph shown in the figure are as follows. The test piece Tp has a thickness of 0.7 mm on one side of the light-transmissive chemically strengthened glass substrate 1 and a cured product layer having a cross-linked structure of an ultraviolet-curable acrylic photosensitive resin as the resin layer 2 with a predetermined thickness. The transparent electrode 4 is formed on the entire surface, and an ITO having a thickness of 140 nm is formed on the entire surface by a sputtering method, and then heat treated at 200 ° C. for 30 minutes.

Glass: Only the translucent chemically strengthened glass substrate 1.
Glass / ITO: A transparent electrode 4 is formed in contact with the translucent chemically strengthened glass substrate 1.
Glass / RL 1.0 μm / ITO: A transparent electrode 4 is formed on a translucent chemically strengthened glass substrate 1 via a resin layer 2 with a thickness of 1.0 μm. (RL: Resin Layer)
Glass / RL 1.5 μm / ITO: A transparent electrode 4 is formed on a translucent chemically strengthened glass substrate 1 through a resin layer 2 having a thickness of 1.5 μm.
Glass / RL 2.0 μm / ITO: A transparent electrode 4 is formed on a translucent chemically strengthened glass substrate 1 via a resin layer 2 with a thickness of 2.0 μm.
Glass / ITO / RL 1.5 μm: A transparent electrode 4 is formed in contact with the translucent chemically strengthened glass substrate 1, and then a resin layer 2 with a thickness of 1.5 μm is formed.
Glass / RL 1.5 μm: A resin layer 2 with a thickness of 1.5 μm is formed in contact with the translucent chemically strengthened glass substrate 1.
Among these, this embodiment is “Glass / RL 1.0 μm / ITO”, “Glasss / RL 1.5 μm / ITO”, “Glasss / RL 2.0 μm / ITO”, and “Glass / RL 1.5 μm”.

  In addition, although the transparent electrode 4 is evaluated by what is not pattern-formed in an electrode shape, since it is not formed in the whole surface, the effect | action in which the transparent electrode 4 reduces the intensity | strength of translucent glass substrate 1 is a pattern It is considered to be stronger than the formed one and to have a more severe evaluation.

  As shown in the figure, although the transparent electrode 4 formed directly on the transparent chemically strengthened glass substrate 1 has a significantly reduced strength, the resin layer is formed on the transparent chemically strengthened glass substrate 1 according to the present embodiment. It can be seen that in all of the cases in which the transparent electrode 4 is formed through 2, the intensity is stronger than the intensity of the original light-transmitting chemically strengthened glass substrate 1. However, those in which the transparent electrode 4 is formed directly on the translucent chemically strengthened glass substrate 1 and then the resin layer 2 is formed are those in which the transparent electrode 4 is directly formed on the translucent chemical strengthened glass substrate 1, The strength is almost unchanged, and the strength remains largely reduced. Moreover, when looking at the strength of what formed only the resin layer 2 in the translucent chemically strengthened glass substrate 1, the strength of what formed the transparent electrode 4 further on this is almost the same. For this reason, if the resin layer 2 is formed, it can be said that the strength in the state in which the resin layer 2 is formed is almost maintained.

As shown in the figure, in the present embodiment, the improvement effect on the strength reduction at the time of forming the transparent electrode 4 corresponds to the reduction of the strength due to the formation of the transparent electrode 4 to the strength of the original light-transmitting chemically strengthened glass substrate 1 Beyond the effect of getting closer, the strength is higher than the strength of the original light-transmitting chemically strengthened glass substrate 1 itself.
As described above, in the present invention, the “improvement effect on the strength reduction at the time of forming the transparent electrode 4” includes that the strength is higher than the strength of the light-transmitting chemically strengthened glass substrate 1 itself.
However, in the present invention, the “improvement effect to the strength reduction at the time of formation of the transparent electrode 4” does not have the effect of making it higher than the strength of the original light transmitting chemically strengthened glass substrate 1 itself. The effect of approaching the strength of the light-transmissive chemically strengthened glass substrate 1 is also included.

  Further astonishing fact is that even if the thickness of the resin layer 2 is 1 μm and 1/700 for the thickness 700 μm (0.7 mm) of the light transmitting chemically strengthened glass substrate 1, the strength of the light transmitting chemically strengthened glass substrate 1 itself The effect of making the In addition, when the thickness of the compressive stress layer of the chemically strengthened glass plate is 10 μm or more, usually about 20 μm (see Patent Document 4), compression with respect to the general thickness 700 μm of the chemically strengthened glass plate as a front protective plate for display As compared with the ratio 20/700 μm of the thickness of the stress layer, in the present invention, a sufficient strength improvement effect is obtained with the layer of resin instead of glass even at 1/20 of that.

<< Modified form >>
The protective plate substrate 10B of the present invention can take other forms besides the above-described form. Hereinafter, some of them will be described.

[Other layers]
In the above-described embodiment, the protective plate substrate 10B has a two-layer configuration of the light-transmitting chemically strengthened glass substrate 1 and the resin layer 2 provided on one side thereof. However, in the present invention, the protective plate substrate 10B may further have other layers.

(Antireflection layer)
For example, the antireflection layer may be provided on the surface on which the resin layer 2 is not provided, that is, the surface that becomes the front side during use. The antireflective layer is usually provided on the entire surface. The antireflective layer may be of known materials and methods of formation. As the antireflective layer, there is an inorganic layer made of an inorganic material or an organic layer made of a resin material, but in the case of the latter, it can be said that it is a kind of the resin layer 2. In this case, it can be said that the resin layer 2 is provided on both sides of the light-transmissive chemically strengthened glass substrate 1.

(Light shielding layer)
As shown in FIG. 12 described as the prior art, a light shielding layer 42 may be provided on the outer peripheral portion of the translucent chemically strengthened glass substrate 1 to provide a front protective plate for a display device without the transparent electrode 4. As the light shielding layer 42, the light shielding layer 3 described in the front surface protective plate for a display device with an electrode described later can be used.

[C] Front Protective Plate for Display Device with Electrode:
Next, the front protective plate for a display device with an electrode according to the present invention will be described.

  One embodiment of a front protective plate for a display with an electrode according to the present invention will be described with reference to FIG. 5 (a) is a plan view seen from the back side, and FIG. 5 (b) is a cross-sectional view.

As shown in the plan view of FIG. 5A, the front protective plate 10 for the display with an electrode of the embodiment shown in FIG. 5 is provided in the central display area A1 and the outer peripheral portion of the display area A1. And an opaque area A2 that blocks visible light. The cross-sectional view of FIG. 5 (b) is a cross-sectional view taken along the line C-C in the plan view of FIG. 5 (a). As shown in the cross-sectional view of FIG. 5 (b), the front protective plate 10 for a display device with an electrode according to the present embodiment includes a translucent chemically strengthened glass substrate 1 and a first transparent chemically strengthened glass substrate 1. A resin layer 2 provided in contact with the second surface S2 on the entire surface of the second surface S2 as one of two surfaces of the surface S1 and the second surface S2 opposite to the first surface S1. A light shielding layer 3 provided on the surface of the second surface S2 and in contact with the resin layer 2 on the surface of the resin layer 2 in the opaque area A2 is provided.
Furthermore, on the surface of the second surface S2 which is the one surface, the transparent electrode 4 provided from the display area A1 to the opaque region A2 and on the surface of the second surface S2 which is also the one surface. And the opaque wiring 6 provided on the surface of the light shielding layer 3 of the opaque area A 2 and electrically connected to the transparent electrode 4.
Since the drawings are also conceptual views, the number of transparent electrodes 4 and the number of wirings 6 in the plan view and the cross-sectional view do not correspond to each other.

In the configuration of the above-described layered positional relationship between the light-transmitting chemically strengthened glass substrate 1 and the resin layer 2 in the present embodiment, the light-transmitting chemically strengthened glass substrate 1 and the resin layer 2 are the above-described protective plate substrate 10B. It can be used. In the present embodiment, the light shielding chemically strengthened glass substrate 1 and the resin layer 2 use the protective plate substrate 10B described above.
The light shielding layer 3 is a decorative layer for decorating the front protective plate 10 for a display with an electrode, in addition to the function of hiding parts such as the wiring 6 and the control circuit which are unnecessary for appearance design.
In the present embodiment, the transparent electrode 4 is formed of ITO by sputtering, and the wiring 6 is formed of APC (silver alloy made of silver, palladium and copper).

  In the present embodiment, the light shielding layer 3 is provided on the second surface S2 of the translucent chemically strengthened glass substrate 1, and with the second surface S2 as the back side, in other words, the second surface S2 is on the display panel 30 side. The first surface S1 is a form that is assumed to be used toward the viewer V of the display of the display panel 30.

  With the above configuration, in the front surface protective plate 10 for a display device with an electrode in the present embodiment, the strength provided by the translucent chemically strengthened glass substrate 1 can be improved, and the translucent chemically strengthened glass substrate 1 can be obtained. The reduction in strength when the transparent electrode 4 is provided can be improved. And the improvement effect can be made higher than the intensity | strength of translucent chemical-strengthening glass substrate 1 itself.

  Hereinafter, each component will be described in more detail.

[Display area A1 and opaque area A2]
As illustrated in the plan view of FIG. 5A, the front surface protective plate 10 for a display with electrode has a display area A1 at the center and is opaque to shield visible light in the outer peripheral portion of the display area A1. It has a region A2. When the display area A1 is applied to the display panel 30 shown by an imaginary line of a two-dot chain line in the cross-sectional view of FIG. 5B, the display area A1 passes through the front protective plate 10 for the display with an electrode. Is an area where the content displayed by can be displayed. The opaque area A2 is applied to the display panel 30 shown by an imaginary line of a two-dot chain line in the cross-sectional view of FIG. This is an area for concealing opaque wiring, connectors and the like which the display panel 30 has in the outer peripheral portion thereof. In addition, the opaque area A2 is an area that also becomes a decorative part by the visible color 8 such as the color that it expresses and logos and marks that are appropriately provided.

[Transparent Chemically Tempered Glass Substrate 1]
As the translucent chemically strengthened glass substrate 1, the one described in the protective plate substrate 10B can be used. Therefore, further description is omitted here.

[Resin layer 2]
As the resin layer 2, the one described for the protective plate substrate 10B can be used. Therefore, further description is omitted here.
In the present embodiment, the resin layer 2 is formed as the same as the embodiment of the protective plate substrate 10B.

[Protective plate substrate 10B]
As the light transmitting chemically strengthened glass substrate 1 and the resin layer 2, depending on the positional relationship between the resin layer 2 and the light shielding layer 3 in particular, for example, the resin layer 2 is closer to the light transmitting chemically strengthened glass substrate 1 than the light shielding layer 3 In the positional relationship formed in the above, it is also possible to use the one that becomes the protective plate substrate 10B. The protective plate substrate 10B has already been described, so further description is omitted here.
In the present embodiment, the resin layer 2 is configured to be closer to the light-transmitting chemically strengthened glass substrate 1 than the light shielding layer 3, and the resin layer 2 is formed on the entire surface in contact with the light-resistant chemically strengthened glass substrate 1. Because of this configuration, a protective plate substrate 10B may be used as the light-transmissive chemically strengthened glass substrate 1 and the resin layer 2, or the light-shielding layer 3, the transparent electrode 4, and the wiring may be formed on the light-transmissive chemically strengthened glass substrate 1. The resin layer 2 may be formed when forming 6 or the like. If the former protective plate substrate 10B is used, the resin layer 2 can be made of general-purpose specifications, and in the latter case, the resin layer 2 having specifications according to the application is formed each time. Can.

[Light-shielding layer 3]
The light shielding layer 3 can be formed by a known material and forming method. For example, the light shielding layer 3 can be formed as a colored resin layer containing a color pigment in a resin binder made of a cured product of a curable resin. As curable resin, photosensitive resin, such as an ultraviolet curable acrylic resin, can be used.
In the present embodiment, the light shielding layer 3 is formed by a photolithography method using a photosensitive resin composition containing a coloring pigment as a coloring resin layer containing a coloring pigment in a resin binder.
In the present embodiment, the light shielding layer 3 expresses, for example, a black color design.

  As the color pigment used for the light shielding layer 3, one corresponding to the color represented by the light shielding layer 3 may be used, and there is no particular limitation. For example, as a color pigment, black pigments, white pigments, red pigments, yellow pigments, blue pigments, green pigments, purple pigments, etc. can be used. The color pigments may be used alone or in combination of two or more color pigments of the same type or different colors.

  The light shielding property of the light shielding layer 3 depends on the required specification and the expression color, but in order to prevent the appearance design from being damaged without being able to conceal the wiring 6 etc., the transmittance is at most 1% or less (Optical density OD 2.0 or more), preferably 0.1% or less in transmittance (optical density OD 3.0 or more), more preferably 0.01% or less (optical density OD 4.0 or more) in transmittance.

[Transparent electrode 4]
In the present embodiment, the transparent electrode 4 extends from the position detection area in the central display area A1 to a portion overlapping the light shielding layer 3 of the opaque area A2 and is electrically connected to the wiring 6 on the surface of the light shielding layer 3 It is done.

FIG. 6 is a view focusing on the pattern of the transparent electrode 4, FIG. 6 (a) is a plan view, and FIG. 6 (b) is a cross-sectional view.
In the present embodiment, the transparent electrode 4 is an example applicable to the electrostatic capacitance method as an example of integration of the touch panel function.
In the present embodiment, the transparent electrode 4 is composed of a first transparent electrode 4a and a second transparent electrode 4b which are formed so as to be insulated from each other.
The first transparent electrode 4a and the second transparent electrode 4b are formed of the same material in the present embodiment. Therefore, in the present specification, when these are collectively referred to, they are also simply referred to as "transparent electrode 4".

In the present embodiment, a touch panel structure in which both the first transparent electrode 4 a and the second transparent electrode 4 b are formed on the same surface is adopted as the transparent electrode 4 for detecting the position of the touch panel. That is, the first transparent electrode 4 a and the second transparent electrode 4 b are formed on the surface of the second surface S 2 which is the same surface of the translucent chemically strengthened glass substrate 1.
With respect to the patterns of the first transparent electrode 4a and the second transparent electrode 4b, various patterns are known in the projected capacitive type, and there is no particular limitation. Typically, a plurality of first transparent electrodes 4a extend in a first direction, and a direction intersecting with the first direction, generally orthogonal to the second direction, is a plurality of second transparent electrodes. The pattern 4b extends in the second direction (see FIG. 5A). The same applies to the present embodiment.

FIG. 6 (a) is a plan view showing the intersection of the first transparent electrode 4a and the second transparent electrode 4b, and FIG. 6 (b) is a cross-sectional view taken along the line C-C in FIG. 6 (a). It is.
Intersections of the first transparent electrode 4 a and the second transparent electrode 4 b are insulated from each other by the interlayer insulating layer 5. The interlayer insulating layer 5 is required at least at the intersection of the first transparent electrode 4a and the second transparent electrode 4b.
Of the first transparent electrode 4a and the second transparent electrode 4b, only one of the electrodes, specifically in the case of the same figure, only the first transparent electrode 4a, the same surface in a pattern where the intersection with the other electrode is lost At the same time, the interlayer insulating layer 5 is formed only at the intersections, and thereafter, the connecting portion 4aC electrically connecting the defective portion across the interlayer insulating layer 5 is formed as a part of the first transparent electrode 4a. It is done.

For the transparent electrode 4, known materials and formation methods can be adopted. For example, for the transparent electrode 4, a transparent conductive film in which the layer itself is transparent can be used. Examples of the transparent electrode 4 made of a transparent conductive film include ITO (Indium Tin Oxide; Indium Tin Oxide), InZnO (Indium Zinc Oxide; Indium Zinc Oxide), AlZnO (Aluminum Zinc Oxide; Aluminum Zinc Oxide), It is possible to use a patterned transparent conductive film such as InGaZnO (Indium Garium Zinc Oxide; indium gallium zinc oxide).
These transparent conductive films can be formed into a film as a film by sputtering or the like and then patterned as a transparent electrode 4 by photolithography and etching.
Specifically, in the present embodiment, the transparent electrode 4 is formed as a transparent conductive film of ITO by sputtering.

[Interlayer insulating layer 5]
Known materials and formation methods can be adopted for the interlayer insulating layer 5. For example, when a resin is used for the interlayer insulating layer 5, an epoxy resin, an acrylic resin, a polyimide resin, etc. can be used, and to give a specific example, for example, photosensitive resins of these resins It can be used. In the case of a photosensitive resin, it can be formed using a photolithography method. In addition, an inorganic material such as silicon oxide can also be used for the interlayer insulating layer 5.
In the present embodiment, the interlayer insulating layer 5 is pattern-formed of an acrylic photosensitive resin.

[Wiring 6]
Known materials and formation methods can be adopted for the wiring 6. For example, for the wiring 6, a metal (including its alloy) such as silver, gold, copper, chromium, platinum, aluminum, palladium, or molybdenum can be used. The wiring 6 can be formed, for example, 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 and etching.
For the wiring 6, it is also possible to use molybdenum (Mo) / aluminum (Al) / molybdenum (Mo) and a conductive layer of a three-layer laminated structure (referred to as MAM).
In the present embodiment, the wiring 6 is formed of a silver alloy (also referred to as APC) composed of silver, palladium and copper as a metal layer using a photolithography method and an etching method.
In the present invention, the method of forming the wiring 6 is not particularly limited, and the wiring 6 may be formed by a printing method such as a screen printing method or an inkjet printing method.

〔Production method〕
Each layer which comprises the front surface protective plate 10 for a display with electrodes of this embodiment is formed as follows, for example. First, the resin layer 2 is formed on the entire surface of the second surface S <b> 2 as one surface of the translucent chemically strengthened glass substrate 1. Next, the light shielding layer 3 is pattern-formed in the area to be the opaque area A2 of the second surface S2 of the light-transmissive chemically strengthened glass substrate 1. Next, the wiring 6 is pattern-formed on the surface of the light shielding layer 3. Next, the transparent electrode 4 is patterned from the display area A1 to the opaque area A2 from the surface of the resin layer 2 in the display area A1 to the surface of the light shielding layer 3 in the opaque area A2. At this time, the transparent electrode 4 is patterned so as to be in contact with the wiring 6 formed on the surface of the light shielding layer 3.
Next, an interlayer insulating layer 5 is formed in a pattern at the intersection of the transparent electrodes 4, and a missing portion of the transparent electrode 4 is formed in a pattern across the interlayer insulating layer 5 to form a connecting portion 4 a C. Complete the whole. Thus, the front protective plate 10 for a display device with an electrode integrated with a touch panel function is manufactured.

[Effect in this embodiment]
By using the front protective plate 10 for a display device with an electrode as described above, the translucent chemically strengthened glass substrate 1 using chemically strengthened glass is obtained, as in the case of the falling ball test result for the protective plate substrate 10B described above. The reduction in strength when the transparent electrode 4 is provided can be improved. Moreover, the improvement effect can be made stronger than the strength of the light-transmissive chemically strengthened glass substrate 1 itself.
Furthermore, since the touch panel function is integrated, the number of parts is reduced, the number of assembling steps is reduced, and the cost can be reduced.

<< Modified form >>
The front protective plate 10 for a display with an electrode according to the present invention may take other forms other than the one described above. Hereinafter, some of them will be described.

[Resin layer 2 of partial formation: Embodiment without the substrate 10B for protective plate]
In the above embodiment, the resin layer 2 includes not only the display area A1 but also the opaque area A2, and the entire surface on the side of the second surface S2 on which the transparent electrode 4 of the translucent chemically strengthened glass substrate 1 is formed. It is an example formed in
However, in the present invention, the resin layer 2 may be formed at least in the display area A1 so that the transparent electrode 4 does not come in contact with the translucent chemically strengthened glass substrate 1.
For example, in the front protective plate 10 for the display with an electrode according to the modified embodiment illustrated in FIG. 7, the resin layer 2 is formed in the display area A1 and the display area A1 as compared with the configuration of FIG. It is an example formed on the surface and the side of a part of the light shielding layer 3 on the display area A1 side of the light shielding layer 3 so as to cover the side surface of the light shielding layer 3 at the boundary between the light emitting layer and the opaque area A2.
Further, as shown in FIG. 7, in a form in which the resin layer 2 is formed on the surface of the light shielding layer 3, although the resin layer 2 is partially formed, the resin layer 2 is already formed on the surface of the translucent chemically strengthened glass substrate 1 The protective plate substrate 10B can not be used. This variation is also such a form.
With such a configuration, the resin layer 2 is a layer of the resin layer 2 in accordance with the specifications of the front protective plate 10 for a display device with an electrode, as compared to the case where the resin layer 2 is prepared in advance as the protective plate substrate 10B. It is possible to increase the degree of freedom in setting the positional relationship and the material and thickness of the resin layer 2.

[Resin layer 2 formed on the entire surface: Form without the protective plate substrate 10B]
In the present invention, even when the resin layer 2 is formed on the entire surface of the surface of the light-transmissive chemically strengthened glass substrate 1, the protective plate substrate 10B may not be used.
For example, after the light shielding layer 3 is formed on the light transmitting chemically strengthened glass substrate 1, the front surface protective plate 10 for the display device with electrode of the modified embodiment illustrated in FIG. In this embodiment, the light shielding layer 3 is formed on the entire surface of the light-transmissive chemically strengthened glass substrate 1 including the surface thereof.
With such a configuration, the resin layer 2 is made of the material of the resin layer 2 in accordance with the specifications of the front surface protective plate 10 for a display device with an electrode, as compared to the case where the resin layer 2 is prepared in advance as the protective plate substrate 10B. And the thickness can be easily set.

[Overcoat layer 7]
In the present invention, for example, the overcoat layer 7 may be formed on the surface of the transparent electrode 4 as in the case of the front surface protective plate 10 for a display device with an electrode shown in FIG. The overcoat layer 7 of the front surface protective plate 10 for the display with an electrode according to the modified embodiment illustrated in the same drawing is the same as that of the second surface S2 of the light-transmissive chemically strengthened glass substrate 1 with respect to the configuration of FIG. In this example, the outermost layer on the surface is formed on the entire surface of the display area A1 and the opaque area A2.

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

  For the overcoat layer 7, known materials and forming methods can be adopted. The overcoat layer 7 is preferably a transparent resin, or a curable resin from the viewpoint of heat resistance. For example, an epoxy resin, an acrylic resin, a polyimide resin, etc. can be used. A thermosetting epoxy resin can be used. Further, as the curable resin, photosensitive resin or the like which is cured by ultraviolet light can also be used. In the case of a photosensitive resin, a photolithography method can be used when partially forming. When the partial formation is not performed, the overcoat layer 7 can be formed by a coating method.

  In the present invention, the overcoat layer 7 may be provided on the entire surface of the light-transmissive chemically strengthened glass substrate 1 including the opaque area A2 and the display area A1 according to the required specification and the like. It does not have to be done.

[Transparent electrode 4: conductive mesh]
In the above embodiment, the transparent electrode 4 is formed of a transparent conductive film whose layer itself is transparent.
However, in the present invention, the transparent electrode 4 may be formed of a conductive mesh in which the layer itself is opaque and formed as a mesh so as to appear as if it were transparent. The line width of the lines constituting the mesh pattern of the conductive mesh is preferably 30 μm or less, more preferably 10 μm or less, from the viewpoint of invisibility. The lower limit of the line width is 1 μm or more, more preferably 2 μm or more, from the viewpoint of avoiding breakage and the like.

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

For the opaque conductor, for example, the materials listed for the wiring 6 can be used. For the opaque conductor, for example, metals (including their alloys) such as silver, gold, copper, chromium, platinum, aluminum, palladium, molybdenum and the like can be used. For example, after forming a film by sputtering as a metal layer of an alloy (also referred to as APC) composed of silver, palladium and copper, it is possible to use one formed by patterning by photolithography and etching.
For the opaque conductor, it is also possible to use molybdenum (Mo) / aluminum (Al) / molybdenum (Mo) and a three-layered conductive layer (referred to as MAM).

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

[Application of Transparent Electrode 4 and Wiring 6]
In the said embodiment, the use of the transparent electrode 4 and the wiring 6 was a touch panel.
In the embodiment in which the transparent electrode 4 is used for a touch panel, there may be a mode in which at least one layer is provided in the position detection system in which the transparent electrodes 4 are two layers on different surfaces.
When the transparent electrode 4 is for a touch panel, the position detection method may be a method other than a projected capacitive method, such as a resistive film method.

  In the present invention, the front protective plate 10 for the display device with electrodes has a touch panel function, in addition to the transparent electrode 4 and the wiring 6, a part of the touch panel function with, for example, a connector and a control circuit. May be all integrated.

  The front protective plate 10 for a display device with an electrode in which all the functions required as a touch panel are integrated can also be called a touch panel. The front protective plate 10 for a display device with an electrode in which a part of the function required as a touch panel is integrated can also be called a touch panel member.

[Opaque Area A2: Visible Information 8]
In the present invention, as shown by a dotted line in FIG. 5A, visible information 8 may be formed in the opaque area A2. The visible information 8 is arbitrary visible information such as a product logo mark, characters for operation explanation, a symbol, and a pattern in the area of the opaque area A2. For the visible information 8, known materials and formation methods can be adopted.
For example, although not shown, the visible information 8 can be patterned by photolithography or the like as a cured product layer of a photosensitive resin containing a color pigment.

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

For example, when the display device to which the front protective plate 10 for a display device with a wire is applied is a mobile phone, the notification window blinks, lights, lights various operations such as incoming call and battery charge state. This is a part to notify the user by the color and the like. Known arrangements, materials and methods of formation may be employed for the notification window.
The notification window can be provided, for example, as a non-formation portion of the light shielding layer 3.

For example, if the display device to which the front protective plate 10 for a display device with a wiring is applied is a mobile phone, the infrared transmission window may malfunction when the mobile phone is put on the ear during a call. It is provided in the front part of the infrared sensor provided as a human sensor for detecting the approach of human skin, from the necessity of preventing it and from the viewpoint of turning off the display of the display panel to extend the battery life. The infrared transmission window has a light shielding property to visible light and a transmission property to infrared light. For the infrared transmission window, known configurations, materials and formation methods can be adopted.
The infrared transmission window can be provided, for example, as a non-formed portion of the backing layer that enhances the light shielding property of the light shielding layer 3.

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

Hereinafter, the display device according to the present invention will be further described in an embodiment thereof.
FIG. 10 shows an embodiment of the display device according to the present invention, and the display device 100 shown in the same figure has a form in which a touch panel function is integrated, and displays with electrodes in order from the front side of the observer V side above the drawing. The apparatus front protection plate 10 and the display panel 30 are provided.

[Front protective plate 10 for display device with electrode]
The front protective plate 10 for a display device with an electrode in the present embodiment has a configuration in which a touch panel function is integrated.
The front protective plate 10 for a display with an electrode is the front protective plate 10 for a display with an electrode according to the present invention described above. More specifically, the front protective plate 10 for a display device with an electrode has the wiring 6 and the transparent electrode 4 as a touch panel function, and although not shown, the transparent electrode 4 is as illustrated in FIG. And the 1st transparent electrode 4a and the 2nd transparent electrode 4b.

In the present embodiment, other components such as a control circuit to function as a touch panel can be further provided.
Therefore, in addition to the transparent electrode 4 and the wiring 6 for the touch panel, all the touch panel functions such as the control circuit and the connector for electrically connecting the control circuit and the wiring 6 are integrated in addition to the transparent electrode 4 for the touch panel and the wiring 6 It may be a computerized one. Of course, in this case, when using the front protective plate 10 for the display with an electrode in which all the functions of the touch panel are integrated, the separate touch panel 20 need not be provided, and the front protective plate 10 for the display with an electrode is a touch panel It can also be referred to as 20, and it becomes a display device of the composition provided with the front protection plate 10 for display devices with electrodes, and the display panel 30 at least. In this embodiment, the wirings, connectors, control circuits, and the like in the outer peripheral portion of the display panel 30 can be hidden.

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

[Effect in this embodiment]
By setting the display device 100 having the above-described configuration, in the front surface protective plate 10 for the display device with an electrode, it is possible to improve the reduction in strength when the transparent electrode 4 is provided on the translucent chemically strengthened glass substrate 1. And the improvement effect can be made higher than the intensity | strength of translucent chemical-strengthening glass substrate 1 itself.
Furthermore, since the touch panel function is integrated, the number of parts is reduced, the number of assembling steps is reduced, and the cost can be reduced.

<< Modified form as display device >>
The display device 100 of the present invention can take other forms besides the above-described form. Hereinafter, some of them will be described.

[Partial integration of transparent electrode 4]
In the display device 100 of the embodiment illustrated in FIG. 10, the front surface protective plate 10 for the display device with electrode has the wiring 6, the first transparent electrode 4a of the transparent electrode 4 and the second transparent electrode 4b as part of the touch panel function. The touch panel function is integrated by providing both.
However, in the present invention, as in the display device 100 of FIG. 11, for example, one of the first transparent electrode 4a and the second transparent electrode 4b of the transparent electrode 4 is provided with the front protective plate 10 for the display device with electrode May be provided in a separate substrate (touch panel component 20a).
A display device 100 according to a modification shown in FIG. 11 has a front protective plate 10 for a display with an electrode, a touch panel component 20a, and a display panel 30 in this order from the front side on the viewer V side above the drawing.

  What kind of configuration is used to integrate the front protective plate 10 for a display with an electrode and the touch panel function may be selected from a configuration suitable for various conditions such as manufacturing facilities and assembly processes that can be used.

Also in the display device 100 configured as described above, in the front surface protective plate 10 for the display device with an electrode, the reduction in strength when the transparent electrode 4 is provided on the translucent chemically strengthened glass substrate 1 can be improved. And the improvement effect can be made higher than the intensity | strength of translucent chemical-strengthening glass substrate 1 itself.
Furthermore, since the touch panel function is integrated, the number of parts is reduced, the number of assembling steps is reduced, and the cost can be reduced.

[Interposition of bonding layer]
In the display device 100 of the form illustrated in FIG. 10 and FIG. 11, there is an air gap between the structural members such as between the front protective plate 10 for the display device with electrodes and the display panel 30, and an air layer exists. However, in the present invention, a bonding layer such as a pressure-sensitive adhesive layer may be filled in between the component members such as between the front surface protective plate 10 for the display with electrode and the display panel 30. By reducing the light reflection on the surface of the member by the bonding layer, the display can be made more visible.

  For the bonding layer, a pressure-sensitive adhesive sheet, a solidified layer of the applied resin liquid, or the like can be used. As the pressure-sensitive adhesive sheet, those made of an acrylic pressure-sensitive adhesive, a polyester-based pressure-sensitive adhesive, an epoxy-based pressure-sensitive adhesive, a silicone-based pressure-sensitive adhesive and the like can be used. As a resin liquid, an acrylic type photocurable resin etc. can be used.

[E] Application:
The application of the substrate 10B for a protective plate, the front protective plate 10 for a display device with an electrode, and the display device 100 according to the present invention is not particularly limited. For example, mobile phones such as smartphones, portable information terminals such as tablet PCs, personal computers, car navigation devices, digital cameras, electronic book terminals, electronic notebooks, game machines, automatic ticket vending machines, ATM terminals, POS terminals, vending machines, etc. .
The protective plate substrate 10B is preferably used for the front protective plate 10 for a display device with an electrode, but the transparent chemically strengthened glass substrate 1 itself is formed by the resin layer 2 even before the transparent electrode 4 is formed. For example, a protective plate for a display device in which the transparent electrode 4 is not formed may be used, such as a simple front protective plate for a display device, because the strength can be increased.

DESCRIPTION OF SYMBOLS 1 translucent chemical-strengthened glass substrate 2 resin layer 3 light shielding layer 4 transparent electrode 4a 1st transparent electrode 4aC connection part 4b 2nd transparent electrode 5 interlayer insulation layer 6 wiring 7 overcoat layer 8 visible information 10 front surface for display devices with electrodes Protective plate 10 B Protective plate substrate 20 Touch panel 20a Touch panel component 30 Display panel 40 Front protective plate for display device (conventional) 41 Transparent glass substrate 42 Light shielding layer 43 Glass plate 50 For display device with electrode (conventional) Front protection plate 61 hollow portion 62 base 63 scattering prevention film 64 hole 65 holding plate 66 bolt 67 nut 68 metal ball 100 display device 200 (conventional) display device A1 display area A2 opaque area M hard ball S1 first surface S2 Two-sided Tp specimen V observer

Claims (2)

Translucent chemical tempered glass substrate,
A resin layer provided on any one of the first surface of the light-transparent chemically strengthened glass substrate and the second surface opposite to the first surface;
Have
The resin layer is non-tacky,
The substrate for a protective plate for a display device, wherein the resin layer is formed directly on the whole of the one surface or only in a region to be a display region on the one surface.   The protective plate substrate according to claim 1, wherein the resin layer has a compressive stress.