JP2020028973A - Plate with printing layer, cover member, and display device - Google Patents

Abstract

To provide a plate with a printing layer, in which air hardly remains in a boundary of the printing layer and a protective cover when the protective cover is laminated on a display panel, and to provide a cover member and a display device.SOLUTION: A plate 1 with a printing layer of this invention includes a plate 2 and a printing layer 3 provided on a first main surface 21 of the plate 2, the printing layer 3 including: a printing layer flat part 32B, the surface of which is flat; and a printing layer edge part 32A provided on an edge part of the flat part 32B, wherein a contact edge 61 with the first main surface 21 is positioned on outside of the flat part 32B. In a cross-sectional view orthogonal to the first main surface 21, among angles 62A and 62B, both being formed by a tangent 61A of the edge part 32A and the first main surface 21 thereof, the angle 62A on a side of the edge part 32A is always less than 90°.SELECTED DRAWING: Figure 2

Description

  The present invention relates to a plate with a print layer, a cover member, and a display device.

Conventionally, a car navigation system, an in-vehicle information device such as an audio device, and a mobile communication device include a display device.
A display device is provided with a plate-shaped protective cover on the front surface of a display panel via an adhesive layer (Patent Document 1). The protective cover has functions of reducing external light reflection and protecting the display panel from external impact. A light-shielding print mask is provided on the surface of the protective cover on the display panel side. The print mask has a function of concealing wiring on the display panel side or concealing illumination light of a backlight to prevent leakage of illumination light from around the display panel.

JP-A-2005-5049

When attaching the protective cover to the display panel, it is necessary to prevent air from remaining between the protective cover and the display panel. This is because the portion where air remains has a different refractive index, which impairs aesthetic appearance. In addition, since the portion where air remains has no adhesive layer, the adhesion between the protective cover and the display panel is reduced.
However, the structure described in Patent Literature 1 has a problem in that air tends to remain at the boundary between the print layer and the protective cover when the protective cover is bonded to the display panel because the step between the print layer and the protective cover is large. was there.

  An object of the present invention is to provide a plate with a printed layer, a cover member, and a display device in which air hardly remains at the boundary between the printed layer and the protective cover when the protective cover is bonded to the display panel.

The plate with a printed layer of the present invention is a plate with a printed layer, comprising a plate and a printed layer provided on the main surface of the plate, wherein the printed layer has a flat printed layer flat surface, A print layer edge provided at an end of the print layer flat portion and a contact end with the main surface located outside the print layer flat portion, wherein the printing is performed in a cross-sectional view orthogonal to the main surface. Among the angles formed by the tangent to the layer edge and the main surface, the angle on the print layer edge side is always less than 90 °.
In the present invention, since the angle between the tangent to the edge of the printing layer and the main surface of the plate is always less than 90 °, when the protective cover is attached to the display panel and air is evacuated from the center of the protective cover to the outside. In addition, air around the edge of the printing layer easily moves to the printing layer flat portion side. Therefore, air easily escapes from the edge of the printing layer, and air hardly remains at the boundary between the printing layer and the main surface.

In the plate with a printing layer according to the present invention, it is preferable that a maximum thickness of the printing layer at an edge portion of the printing layer is larger than a thickness of the flat portion of the printing layer.
In this aspect of the present invention, since the maximum thickness of the printing layer edge is thicker than the printing layer flat portion, even if pinholes occur when applying the printing layer, the material of the printing layer before drying is reduced. Since the pinhole is filled, the pinhole can be made inconspicuous.

The plate with a printed layer of the present invention preferably includes an upper printed layer provided on the upper surface of the printed layer, and the upper printed layer is preferably provided inside the printed layer in plan view.
In this aspect of the present invention, even if a pinhole is formed in the print layer, the pinhole can be made inconspicuous because the upper surface print layer covers the pinhole.
Further, according to this aspect of the present invention, since the printed layer has multiple layers, the concealment of wiring and illumination light can be enhanced.

In the plate with a printing layer of the present invention, the upper surface printing layer includes an upper surface printing layer flat portion having a flat surface, and an upper surface printing layer edge provided at an end of the upper surface printing layer flat portion, In a cross-sectional view orthogonal to the main surface, it is preferable that, of the angles formed by the tangent line of the upper print layer edge and the print layer flat portion, the angle of the upper print layer edge side is always less than 90 °.
In this aspect of the present invention, since the angle between the tangent to the upper print layer edge and the print layer flat portion is always less than 90 °, when the protective cover is bonded to the display panel, the angle around the upper print layer edge is reduced. Certain air is likely to move toward the upper printing layer flat portion side. Therefore, air easily escapes from the edge of the upper printing layer, and air hardly remains at the boundary between the printing layer and the upper printing layer.

In the plate with a printing layer according to the present invention, it is preferable that the printing layer has a frame shape in a plan view, and the edge of the printing layer is provided at least on an inner peripheral end side of the printing layer.
In this aspect of the present invention, particularly, it is difficult for air to remain inside the frame, so that the visibility of the display unit and the like inside the frame can be improved.

In the plate with a printed layer of the present invention, the plate is preferably glass.
In this aspect of the present invention, by using glass as the plate, a plate with a printed layer having both high strength and good texture can be provided.

In the plate with a printed layer of the present invention, the glass is preferably made of tempered glass.
In the present invention, by using tempered glass as the glass, it is possible to provide a plate with a printed layer excellent in strength and scratch resistance.

The cover member of the present invention comprises the above-described plate with a printing layer.
In the present invention, by using the plate with the printing layer as the cover member, the object can be protected while ensuring the visibility.

A display device of the present invention includes the above-described cover member, a display panel, and an adhesive layer for bonding the cover member and the display panel.
In the present invention, when the protective cover is bonded to the display panel via the adhesive layer, air hardly remains at the boundary between the print layer and the protective cover. Therefore, a display device with excellent appearance can be provided.

The perspective view of the board with a printing layer concerning one embodiment of the present invention. FIG. 2 is a cross-sectional view taken along the line II-II in FIG. 1, and is a cross-sectional view of the plate with a printed layer of Example 1 in the embodiment. FIG. 3 is a partial cross-sectional view of a display device including the plate with a printing layer. Sectional drawing of the board with a printing layer which concerns on the modification of one Embodiment of this invention. Sectional drawing of the board with a printing layer which concerns on the modification of one Embodiment of this invention. It is sectional drawing of the board with a printing layer which concerns on the modification of one Embodiment of this invention, Comprising: Sectional drawing of the board with a printing layer of Example 2 in an Example. Sectional drawing of the board with a printing layer of Example 3 in an Example. Sectional drawing of the board with a printing layer of Example 4 in an Example.

[Embodiment]
Hereinafter, an embodiment of the present invention will be described with reference to the drawings.
(Configuration of plate with printing layer)
First, the configuration of the plate with a printing layer will be described.
A plate 1 with a print layer shown in FIG. 1 includes a plate 2 and a print layer 3. The plate 1 with a printing layer further includes a top printing layer 81.
The plate 2 is a transparent tempered glass having a rectangular shape in plan view, and includes a first main surface 21, a second main surface 22, and an end surface 23 as shown in FIG. 2. A chamfer 24 is provided on the end face 23.

The printing layer 3 is provided for imparting light shielding properties to the plate 1 with a printing layer. The print layer 3 has a rectangular frame shape in a plan view, and is provided on a peripheral portion of the first main surface 21 of the plate 2.
As shown in FIG. 2, the print layer 3 includes a print layer flat portion 32B and print layer edges 32A and 32C.

The printing layer flat part 32B is a part whose surface is flat.
The print layer edge 32A is provided at the inner peripheral end of the print layer flat portion 32B. The contact end 61 between the printing layer edge 32A and the first main surface 21 is located outside the printing layer flat portion 32B (here, on the center side of the plate 2). More specifically, the contact end 61 is located closer to the center of the plate 2 than the upper end 61B of the printing layer flat portion 32B on the printing layer edge 32A side.
Here, the inside refers to a region sandwiched between both ends of the object or a direction toward the region, and the outside refers to a region not sandwiched between both ends of the object or a direction toward the region. Is shown. The same applies to the following description.

As shown in FIG. 2, the tangent line 61 </ b> A of the printing layer edge portion 32 </ b> A intersects the first main surface 21 in a cross-sectional view orthogonal to the first main surface 21. Of the intersecting angles 62A and 62B, the angle 62A on the printing layer edge 32A side is always less than 90 °. The tangent 61A is a tangent near the contact end 61, but the angle at which the tangent intersects the first main surface 21 is always less than 90 ° in other places. For example, of the angles 72A and 72B at which the tangent 70A near the upper end 61B intersects the first main surface 21, the angle 72A on the side of the print layer edge 32A is also less than 90 °.
In FIG. 2, the outline of the printing layer edge 32 </ b> A has an upwardly convex arc shape.
The angle 62A at which the tangent 61A at the contact end 61 intersects the first main surface 21 is preferably 60 ° or less, more preferably 30 ° or less. This is because air is more likely to move to the printing layer flat portion 32B side, and air is less likely to remain at the boundary between the printing layer 3 and the main surface.
The maximum thickness T1 of the printing layer edge 32A is greater than the thickness T2 of the printing layer flat portion 32B.

  The printing layer edge 32C is provided at the outer peripheral end of the printing layer flat portion 32B. The contact end 63 between the printing layer edge 32C and the first main surface 21 is located outside the printing layer flat portion 32B (here, the outer peripheral side of the plate 2). More specifically, the contact end 63 is located on the outer peripheral side of the plate 2 rather than the upper end 63B of the printed layer flat portion 32B on the printed layer edge 32C side.

As shown in FIG. 2, the tangent line 63 </ b> A of the printing layer edge 32 </ b> C intersects (an extension of) the first main surface 21 in a cross-sectional view orthogonal to the first main surface 21. Of the intersecting angles 64A and 64B, the angle 64A on the printing layer edge 32C side is always less than 90 °. In FIG. 2, the contour of the printing layer edge 32 </ b> C is an arc that is convex upward.
The angle 64A at which the tangent line 63A at the contact end 63 intersects with the first main surface 21 is preferably 60 ° or less, more preferably 30 ° or less. This is because air is more likely to move to the printing layer flat portion 32B side, and air is less likely to remain at the boundary between the printing layer 3 and the main surface.
The maximum thickness T3 of the printing layer edge portion 32C is larger than the thickness T2 of the printing layer flat portion 32B.

The upper surface printing layer 81 is provided to further enhance the light shielding property. The upper surface printing layer 81 is stacked inside the printing layer 3 in a plan view.
The upper surface printing layer 81 includes an upper surface printing layer flat portion 81B and upper surface printing layer edges 81A and 81C.

The upper printing layer flat portion 81B is a portion having a flat surface.
The upper printing layer edge portion 81A is provided at the inner peripheral end of the upper printing layer flat portion 81B. The contact end 65 between the upper print layer edge 81A and the print layer 3 is located outside the upper print layer flat portion 81B (here, the center side of the plate 2). More specifically, the contact end 65 is located closer to the center of the plate 2 than the upper end 65B of the upper print layer flat portion 81B on the upper print layer edge 81A side.

As shown in FIG. 2, a tangent line 65A of the upper surface printing layer edge portion 81A intersects (the upper surface of) the printing layer flat portion 32B in a cross-sectional view orthogonal to the first main surface 21. Of the intersecting angles 66A and 66B, the angle 66A on the upper print layer edge 81A side is always less than 90 °. In FIG. 2, the contour of the upper surface printing layer edge portion 81A is an arc shape that is upwardly convex.
The angle 66A at which the tangent line 65A at the contact end 65 intersects the upper printed layer flat portion 81B is preferably 60 ° or less, more preferably 30 ° or less. This is because air is more likely to move to the upper print layer flat portion 81B side, and air is less likely to remain at the boundary between the print layer 3 and the main surface.
The maximum thickness T4 of the upper printing layer edge portion 81A is larger than the thickness T5 of the upper printing layer flat portion 81B.

  The upper print layer edge portion 81C is provided at the outer peripheral end of the upper print layer flat portion 81B. The upper print layer edge 81C has a contact end 67 with the print layer 3 outside the upper print layer flat portion 81B (here, the outer peripheral side of the plate 2). More specifically, the contact end 67 is located on the outer peripheral side of the plate 2 with respect to the upper end portion 67B of the upper print layer flat portion 81B on the upper print layer edge 81C side.

As shown in FIG. 2, the tangent 67A of the upper surface printing layer edge portion 81C intersects (the upper surface of) the printing layer flat portion 32B in a cross-sectional view orthogonal to the first main surface 21. Of the intersecting angles 68A and 68B, the angle 68A on the upper printing layer edge 81C side is always less than 90 °. In FIG. 2, the contour of the upper printing layer edge portion 81 </ b> C is an arc that is upwardly convex.
The angle 68A at which the tangent 67A at the contact end 67 intersects with the upper printed layer flat portion 81B is preferably 60 ° or less, more preferably 30 ° or less. This is because air is more likely to move to the upper print layer flat portion 81B side, and air is less likely to remain at the boundary between the print layer 3 and the main surface.
The maximum thickness T6 of the upper printing layer edge portion 81C is larger than the thickness T5 of the upper printing layer flat portion 81B.

As shown in FIG. 1, a region surrounded by the print layer 3 in the plate 1 with a print layer is a display region 4 in which a display panel such as a liquid crystal panel is arranged. When the plate 1 with a print layer is used for a display device (see FIG. 3), a display panel such as a liquid crystal panel is arranged in the display area 4. The display panel is provided with wirings, circuits, and the like for driving. When the display panel is viewed through the plate 2, the wirings and the like are visible, and the appearance is impaired. Therefore, by providing the printing layer 3 and the upper surface printing layer 81 on the peripheral edge of the plate 2, wirings and the like arranged near the outer periphery can be hidden, and the appearance can be enhanced.
When the display panel is a liquid crystal panel, a backlight is provided on the back surface of the liquid crystal panel. However, if illumination light from the backlight leaks to the outside of the display area 4, the appearance is impaired. Therefore, by providing the printing layer 3 and the upper surface printing layer 81 on the peripheral portion of the plate 2, it is possible to prevent the illumination light from leaking from the outer periphery of the display area 4, and to enhance the appearance.

(Production method of plate with printing layer)
Next, a method for manufacturing the plate 1 with a printed layer will be described.
First, a transparent glass is cut into a predetermined size, and a chamfered plate 2 is prepared. At this time, it is preferable to perform the chamfering so that the dimension of the chamfered portion 24 in a plan view is 0.05 mm or more and 0.5 mm or less.
Thereafter, the printing layer 3 is formed on the plate 2.
Specifically, first, as shown in FIG. 2, a square frame-shaped print layer 3 is printed on the first main surface 21 of the plate 2. At this time, the angles 62A and 64A of the printing layer edges 32A and 32C are, for example, the screen portion used in the screen printing method, the mesh portion through which ink passes, and the emulsion portion that suppresses the transmission of ink. It can be adjusted by controlling the wettability to the ink. Specifically, when the wettability of the emulsion portion with respect to the ink is improved as compared with the mesh portion, the angles 62A and 64A become large. This is because the printing layer edges 32A and 32C are formed by supplying ink to the boundary between the mesh and the emulsion in the screen plate at the time of printing, but if the wettability of the emulsion portion to the ink is improved, This is because the ink is pulled toward the emulsion portion, and the amount of ink filled at the boundary between the mesh portion and the emulsion portion is reduced.
The maximum thicknesses T1 and T3 of the printing layer edges 32A and 32C can be adjusted by controlling the difference in ink wettability between the mesh portion and the emulsion portion as described above. Specifically, when the difference in wettability of the mesh portion and the emulsion portion with respect to ink is increased (the wettability of the mesh portion is improved), the maximum thicknesses T1 and T3 are increased. This is because the ink is pulled more toward the mesh portion and the edge portion becomes thicker.
The mesh size of the screen plate used for printing the printing layer 3 is preferably 15 μm or more and 35 μm or less. The speed of the squeegee is preferably 50 mm / s or more and 200 mm / s or less, more preferably 100 mm / s or more and 200 mm / s or less. Further, the thickness of the printing layer 3 is preferably 3 μm or more and 6 μm or less. By printing under such conditions, it is possible to form the print layer 3 having a quality that does not cause any problem even if touched by the user.

Next, a rectangular frame-shaped upper surface print layer 81 is printed on the print layer 3. At this time, printing is performed inside the printing layer 3 in plan view using the same ink as the printing layer 3. At this time, similarly to the printing layer 3, the wettability of the mesh portion of the screen plate, through which the ink is transmitted, and the emulsion portion, which suppresses the transmission of the ink, to the ink is adjusted to adjust the upper printing layer edge portion 81A. , 81C can be formed, and the maximum thicknesses T4, T6 can be controlled.
The mesh diameter of the screen plate used for printing the upper surface printing layer 81 is preferably 30 μm or more and 50 μm or less. The speed of the squeegee is preferably 50 mm / s or more and 200 mm / s or less, more preferably 100 mm / s or more and 200 mm / s or less. Further, the thickness of the upper surface printing layer 81 is preferably 3 μm or more and 8 μm or less. By printing under such conditions, even if a pinhole is formed in the print layer 3, the print layer 3 can be covered thereon, and the upper print layer 81 can be formed without reducing production efficiency.
Thereafter, by performing drying and baking, the print layer 3 and the upper surface print layer 81 are cured, and the plate 1 with a print layer is obtained.

[Function and effect of plate with printing layer]
Since the angles 62A, 64A formed by the printed layer edges 32A, 32C and the first main surface 21 are always less than 90 °, the periphery of the printed layer edges 32A, 32C when the protective cover is bonded to the display panel. Is easily moved to the printing layer flat portion 32B side. For this reason, air easily escapes from the print layer edges 32A and 32C, and air hardly remains at the boundary between the print layer 3 and the first main surface 21.

  The maximum thicknesses T1, T3 of the printing layer edges 32A, 32C are greater than the thickness T2 of the printing layer flat portion 32B. For this reason, even if pinholes occur in the print layer edges 32A and 32C when the print layer 3 is applied, the pinholes can be made inconspicuous because the material of the print layer 3 before drying fills the pinholes.

  By providing the upper surface print layer 81 on the print layer 3 of the plate 1 with a print layer, even if a pinhole is formed in the print layer 3, the upper surface print layer 81 covers the pinhole, so that the pinhole is inconspicuous. it can. By providing the upper surface printing layer 81, the number of printing layers is increased, so that the concealment of wiring and illumination light can be enhanced.

  Since the angle 66A, 68A formed by the printed layer flat portion 32B and the upper surface printed layer edges 81A, 81C is always less than 90 °, the periphery of the upper surface printed layer edges 81A, 81C when the protective cover is bonded to the display panel. Is easily moved to the upper printing layer flat portion 81B side. Therefore, air easily escapes from the upper printing layer edges 81A and 81C, and air hardly remains at the boundary between the printing layer 3 and the upper printing layer 81.

  Since the print layer 3 has a frame shape in a plan view and the print layer edge 32A is provided on the inner peripheral end side of the print layer 3, it is difficult for air to remain inside the frame, and a display portion or the like inside the frame is not provided. Visibility can be improved.

[Modification]
The present invention is not limited only to the above embodiment, and various improvements and design changes can be made without departing from the spirit of the present invention. The specific procedure, structure, and the like for implementing the present invention may be other structures and the like as long as the object of the present invention can be achieved.

For example, the plate 2 can be made of various shapes and materials depending on the application.
The shape may be, for example, not only a plate having only a flat surface, but also a plate having a curved surface or a concave portion at least in part. Further, it is not limited to a plate, but may be a film.
As the material, any material may be used as long as it is transparent, and general glass, for example, inorganic glass, organic glass such as polycarbonate and acryl can be used, and other synthetic resins can also be used.
When using inorganic glass as the plate 2, the thickness is preferably 0.5 mm or more and 5 mm or less. If the glass has a thickness equal to or more than the lower limit, there is an advantage that a plate 1 with a printed layer having both high strength and good texture can be obtained. In the case where an inorganic glass is used, the thickness is more preferably 0.7 mm or more and 3 mm or less, and still more preferably 1 mm or more and 3 mm or less.
When organic glass, synthetic resin, or the like is used as the plate 2, the substrate 2 may be formed of a base material that is the same or different and may be stacked, or various types of adhesive layers may be inserted between the base materials.
When inorganic glass is used for the plate 2, any of a chemical strengthening treatment and a physical strengthening treatment may be performed, but it is preferable to perform the chemical strengthening treatment. When strengthening a relatively thin inorganic glass as described above, a chemical strengthening treatment is appropriate.

  At least one of the first main surface 21 and the second main surface 22 of the plate 2 is subjected to anti-glare processing (AG processing), anti-reflection processing (AR processing), anti-fingerprint processing (AFP processing), and the like. Preferably, it is applied. The first main surface 21 and the chamfered portion 24 on which the print layer 3 is provided may be subjected to a primer treatment, an etching treatment, or the like in order to improve the adhesion with the print layer 3.

The ink forming the print layer 3 and the upper print layer 81 may be inorganic or organic. Examples of the inorganic ink include at least one selected from SiO ₂ , ZnO, B ₂ O ₃ , Bi ₂ O ₃ , Li ₂ O, Na ₂ O, and K ₂ O, CuO, Al ₂ O ₃ , It may be a composition comprising at least one selected from ZrO ₂ , SnO ₂ and CeO ₂ , Fe ₂ O ₃ and TiO ₂ .

As the organic ink, various printing materials in which a resin is dissolved in a solvent can be used. For example, as the resin, acrylic resin, urethane resin, epoxy resin, polyester resin, polyamide resin, vinyl acetate resin, phenol resin, olefin, ethylene-vinyl acetate copolymer resin, polyvinyl acetal resin, natural rubber, styrene-butadiene copolymer At least one selected from the group consisting of resins such as coalescing, acrylonitrile-butadiene copolymer, polyester polyol and polyether polyurethane polyol may be used. As the solvent, water, alcohols, esters, ketones, aromatic hydrocarbon solvents, and aliphatic hydrocarbon solvents may be used. For example, isopropyl alcohol, methanol, ethanol and the like can be used as alcohols, ethyl acetate can be used as esters, and methyl ethyl ketone can be used as ketones. As the aromatic hydrocarbon solvent, toluene, xylene, Solvesso ^™ 100, Solvesso ^™ 150 or the like can be used, and as the aliphatic hydrocarbon solvent, hexane or the like can be used. Note that these are given as examples, and various other printing materials can be used. After the organic printing material is applied to the transparent plate, the solvent is evaporated to form the resin print layer 3 and the upper print layer 81.

The ink used for the print layer 3 and the upper print layer 81 may include a colorant. As the colorant, for example, when the print layer 3 and the upper surface print layer 81 are black, a black colorant such as carbon black can be used. In addition, a colorant having an appropriate color according to a desired color can be used.
At least one of the printing layer 3 and the upper surface printing layer 81 may be printed a desired number of times, and different inks may be used for printing.
Different inks may be used for the print layer 3 and the upper print layer 81. For example, when the user wants to make the printed layer 3 look white when viewing the plate 1 with the printed layer from the second main surface 22 side, the printed layer 3 is printed in white, and then the upper printed layer 81 is printed. May be printed in black. Accordingly, when the user views the print layer 3 from the second main surface 22 side, the white print layer 3 that suppresses the so-called “transparency” related to the visibility of the back surface of the print layer 3 can be formed.

The planar shape of the print layer 3 and the upper surface print layer 81 may be linear along one side of the first main surface 21, L-shaped along two continuous sides, or two straight lines along two opposing sides. When the first main surface 21 is a polygon other than a quadrangle, a circle, or an irregular shape, the print layer 3 and the upper surface print layer 81 have a frame shape corresponding to these shapes, a linear shape along one side of the polygon, and a circular shape. It may be provided in an arc shape along the part.
Drying and baking of the printing layer 3 and the upper surface printing layer 81 may be performed after the formation of the printing layer 3 and the upper surface printing layer 81, respectively, or may be performed after both of them are formed. Conditions and the like can be appropriately selected according to the characteristics of the ink used.

As in the plate 1A with a print layer shown in FIG. 4, the print layer edge 32A may be provided only on the inner peripheral side of the print layer 3. Further, the upper surface printing layer edge portion 81A may be provided only on the inner peripheral side of the upper surface printing layer 81.
A structure without the upper surface print layer 81 may be used as in a plate 1B with a print layer shown in FIG. In the printing layer 3, the maximum height T1 of the printing layer edge portion 32A may be equal to or less than the height T2 of the printing layer flat portion 32B.
As in a plate 1D with a printed layer shown in FIG. 6, the upper printed layer 81 may not have the upper printed layer edges 81A and 81C.
In FIGS. 1 to 6, the outline of the printed layer edges 32A and 32C or the upper surface printed layer edges 81A and 81C in a sectional view is a curve, but may be a straight line.

The plate 1 with a printed layer of the present invention can be used, for example, as a panel display such as a liquid crystal display or an organic EL display, or a cover member for a display device such as a cover glass of an in-vehicle information device or a portable device. By using the plate 1 with a printed layer of the present invention as a cover for a display device, a display device with excellent aesthetic appearance can be provided.
The printed layer 3 of the plate 1 with a printed layer of the present invention may constitute a pattern of an article using the plate 1 with a printed layer, and improve the design of the article.

Here, an example of a display device including the plate 1 with a print layer will be described.
The display device 10 shown in FIG. The frame 5 includes a bottom 51, a side wall 52 intersecting the bottom 51, and an opening 53 facing the bottom 51. The liquid crystal module 6 is arranged in a space surrounded by the bottom 51 and the side wall 52. The liquid crystal module 6 includes a backlight 71 disposed on the bottom 51 side, and a liquid crystal panel (display panel) 72 disposed on the backlight 71.
At the upper end of the frame 5, the plate 1 with a printing layer is provided so that the first main surface 21 faces the liquid crystal module 6 side. The printed layer-equipped plate 1 has the print layer 3 and the upper print layer 81 on the frame 5 and the print layer 3 and the upper print layer 81 via the adhesive layer 7 provided on the upper end surface of the opening 53 and the side wall 52. A part and the display area 4 of the first main surface 21 are bonded to the liquid crystal module 6, respectively.

The adhesive layer 7 is preferably transparent like the plate 2 and has a small difference in refractive index from the plate 2.
Examples of the adhesive layer 7 include a layer made of a transparent resin obtained by curing a liquid curable resin composition. Examples of the curable resin composition include a photocurable resin composition, a thermosetting resin composition, and the like. Among them, a photocurable resin composition containing a curable compound and a photopolymerization initiator is preferable. The curable resin composition is applied using a method such as a die coater or a roll coater to form a curable resin composition film.
The adhesive layer 7 may be an OCA film (OCA tape). In this case, an OCA film may be attached to the first main surface 21 side of the plate 1 with the printing layer.
The thickness of the adhesive layer 7 is preferably from 5 μm to 400 μm, more preferably from 50 μm to 200 μm. The storage shear modulus of the adhesive layer 7 is preferably 5 kPa or more and 5 MPa or less, more preferably 1 MPa or more and 5 MPa or less.

In manufacturing the display device 10, the assembly order is not particularly limited. For example, a structure in which the adhesive layer 7 is arranged on the plate 1 with the printing layer may be prepared in advance, arranged on the frame 5, and then the liquid crystal module 6 may be bonded.
The display device 10 may include a touch sensor or the like. When a touch sensor is incorporated, the touch sensor is arranged on the first main surface 21 side of the plate 1 with a printing layer via an adhesive layer, and the liquid crystal module 6 is arranged therethrough via the adhesive layer 7.

  Next, examples of the present invention will be described. The present invention is not limited to the following examples. Examples 1 and 2 are examples of the present invention, and Examples 3 and 4 are comparative examples.

  As the plate 2, a glass plate with a print layer was obtained by the following procedure using a plate-like glass (Dragon Trail (registered trademark), manufactured by Asahi Glass Co., Ltd.) having a thickness of 2 mm and a square main surface.

<Example 1>
The glass plate was subjected to (1) anti-glare treatment, (2) grinding of the end face, (3) chemical strengthening treatment and alkali treatment, and (4) formation of a printed layer in this order. The specific processing is as follows.

(1) Anti-glare treatment An anti-glare treatment by frost treatment was performed on the second main surface 22 of the glass plate in the following procedure.
First, an acid-resistant protective film (hereinafter, simply referred to as “protective film”) was bonded to the main surface (first main surface 21) of the glass plate on which the anti-glare treatment was not performed. This glass plate was immersed in a 3% by mass aqueous solution of hydrogen fluoride for 3 minutes, and the glass plate was etched to remove dirt attached to the second main surface 22 of the glass plate. Subsequently, the glass plate was immersed in a mixed aqueous solution of 15% by mass of hydrogen fluoride and 15% of potassium fluoride for 3 minutes, and frost treatment was performed on the second main surface 22 of the glass plate. Thereafter, the glass plate was immersed in a 10% by mass aqueous solution of hydrogen fluoride for 6 minutes to perform anti-glare treatment. When the protective film of the glass plate was removed and the haze value was measured, it was 25%. The haze value was measured using a haze meter (trade name: HZ-V3, manufactured by Suga Test Instruments Co., Ltd.) according to JIS K 7136.

(2) Grinding treatment of end face The glass plate subjected to the anti-glare treatment was cut into a size of 150 mm × 250 mm. Thereafter, C chamfering was performed over the entire circumference of the glass plate at a size of 0.2 mm from the end face of the glass. The chamfering was performed using a No. 600 grindstone (manufactured by Tokyo Dia) at a rotation speed of the grindstone of 6500 rpm and a moving speed of the grindstone of 5000 mm / min. As a result, the arithmetic surface roughness Ra of the end face became 450 nm.

(3) Chemical strengthening treatment and alkali treatment Next, the glass plate was immersed in a molten salt obtained by heating to 450 ° C. to melt the potassium nitrate salt for 2 hours to perform a chemical strengthening treatment. Thereafter, the glass plate was lifted from the molten salt and gradually cooled to room temperature in 1 hour. By the above treatment, a chemically strengthened glass plate having a surface compressive stress (CS) of 730 MPa and a stress layer depth (DOL) of 30 μm was obtained.
Further, this glass plate was immersed in an alkaline solution (trade name: Sunwash TL-75, manufactured by Lion Corporation) for 4 hours to perform an alkali treatment.

(4) Formation of Print Layer The print layer 3 was formed in a black frame shape having a width of 2 cm on the outer peripheral portion of the first main surface 21 of the glass plate. First, a screen plate having a mesh diameter of 30 μm was set on a screen printing machine. The screen plate used was prepared so that the wettability of the emulsion portion with respect to the ink was different from that of the mesh portion. A black ink (trade name: HF GV3RX01 710 Black, manufactured by Seiko Advance Co., Ltd.) was prepared as the ink. Next, using a screen printing machine, the black color is adjusted so that the maximum thicknesses T1 and T3 of the print layer edges 32A and 32C become 8 μm and the thickness T2 (average thickness) of the print layer flat portion 32B becomes 4 μm. The printing layer 3 was formed by applying ink. At this time, the angles 62A and 64A at which the tangents at the contact edges 61 and 63 between the printing layer edges 32A and 32C and the glass plate intersect the first main surface 21 were 11 °. At the time of printing, printing is performed such that the contact end 63 is located at a position of 0.1 mm from the end face of the glass plate in a plan view so that the print layer edge 32C is formed on the end face subjected to the grinding process. Was. Thereafter, the printing layer 3 was dried by holding at 120 ° C. for 10 minutes.
Subsequently, on the printing layer 3, the width of the printing layer was narrowed by 0.4 mm from the end face of the printing layer 3 in a side view to form an upper printing layer 81. Specifically, first, a screen plate having a mesh diameter of 40 μm was set on a screen printing machine. The screen plate used was prepared so that the wettability of the emulsion portion with respect to the ink was different from that of the mesh portion. A black ink (trade name: HF GV3RX01 710 Black, manufactured by Seiko Advance Co., Ltd.) was prepared as the ink. Next, using a screen printing machine, the maximum thicknesses T4 and T6 of the upper printing layer edges 81A and 81C are 10 μm, and the thickness T5 (average thickness) of the upper printing layer flat portion 81B is 5 μm. Thus, the upper surface printing layer 81 was formed by applying the black ink. At this time, the angles 66A and 68A at which the tangents at the contact ends 65 and 67 between the upper surface printing layer edges 81A and 81C and the upper surface printing layer 81 intersect with the upper surface printing layer flat portion 81B were 13 °. Then, it was kept at 120 ° C. for 30 minutes and dried. By the above procedure, two glass plates with a printing layer were obtained. FIG. 2 shows the obtained shape. Print layer edges 32A and 32C were formed at the inner and outer peripheral edges of the print layer 3. In addition, upper print layer edges 81A and 81C were formed at inner and outer peripheral ends of the upper print layer 81.

<Example 2>
(4) In the step of forming a printing layer, the screen plate used was prepared such that the wettability of the emulsion portion and the mesh portion to the ink was the same. Two glass plates with a printing layer were obtained in the same procedure as in Example 1 except that printing was performed using this screen plate so that the thickness of the upper surface printing layer 81 was uniform (average thickness: 6 μm). FIG. 6 shows the obtained shape. Print layer edges 32A and 32C were formed at the inner and outer peripheral edges of the print layer 3, but unlike Example 1, the upper print layer 81 did not have the upper print layer edges 81A and 81C.

<Example 3>
Unlike Example 1, in the step of (4) forming a printing layer, the screen plate used was prepared so that the wettability of the emulsion portion and the mesh portion to the ink was the same. Using this screen plate, printing was performed so that the thickness of the printing layer 3 was uniform (average thickness 5 μm), and otherwise, two glass plates with a printing layer were obtained in the same procedure. FIG. 7 shows the obtained shape. In the glass plate with print layer 90A shown in FIG. 7, the upper print layer edges 81A and 81C are formed at the inner and outer peripheral edges of the upper print layer 81. However, unlike Example 1, printing is performed at the inner and outer peripheral edges of the print layer 3. The layer edges 32A and 32C were not formed.

<Example 4>
(4) In the step of forming a printing layer, the screen plate used was prepared such that the wettability of the emulsion portion and the mesh portion to the ink was the same. A printing layer was provided in the same procedure as in Example 1 except that printing was performed using this screen plate so that the thickness of the printing layer 3 and the upper printing layer 81 was uniform (the average thickness was 5 μm and 6 μm, respectively). Two glass plates were obtained. FIG. 8 shows the obtained shape. In the glass plate with print layer 90B shown in FIG. 8, unlike the example 1, the print layer edges 32A and 32C were not formed at the inner and outer peripheral edges of the print layer 3. The upper print layer edges 81A and 81C were not formed at the inner and outer peripheral edges of the upper print layer 81, either.

[Evaluation]
A total of eight glass sheets each having the printing layer obtained in Examples 1 to 4 were prepared, and an adhesive layer was formed by the following procedure, and the inner peripheral end face of the printing layer 3 was observed.

(Formation of adhesive layer)
An adhesive layer was formed on the first main surface 21 of the glass plate with a printed layer of Examples 1 to 4 by the following procedure. First, MHM-FWD175 (manufactured by Niei Chemical Co., Ltd.) was prepared as an adhesive. Next, this adhesive was applied to the first main surface 21 of the glass plate with a printed layer so as to extend over the printed layer 3 (upper printed layer 81) and the non-printed layer to form an adhesive layer.

(Observation by optical microscope)
An optical microscope was used to evaluate whether residual air was present at the inner peripheral edge of the print layer 3 (the boundary between the inner peripheral side of the print layer 3 and the first main surface 21) as follows. Observation was performed in a reflection mode using a semiconductor / FPD optical microscope (manufactured by Olympus Corporation, model number: MX61LT-N1277MU2). The observation magnification was 50 times. Table 1 shows the results. No. 1 in Table 1. 1, No. Reference numeral 2 denotes the first and second sheets of the glass sheet with the printing layer prepared two by two.

The inner peripheral end faces of the printed layers 3 of Examples 1 and 2 had no portion where air remained, and it was found that the structure was such that air easily escaped from the inner peripheral end faces. When the glass sheets with the printed layers obtained in Examples 1 and 2 were incorporated in a display device, they were excellent in appearance.
On the other hand, there were several places where air remained on the inner peripheral end faces of the printed layers 3 of Examples 3 and 4. When the glass plate with a printing layer obtained in Examples 3 and 4 was incorporated into a display device, the visibility of the display portion was deteriorated due to the influence of residual air, and an excellent appearance was not obtained. From this result, it became clear that air would easily remain if the inner edge of the print layer 3 had no print layer edge 32A.

  From the above results, it was found that the glass plate with a printed layer of the example had a better appearance than the glass plate with a printed layer of the comparative example.

  1, 1A, 1B: plate with printing layer, 2: plate, 3: printing layer, 6: liquid crystal module, 7: adhesive layer, 10: display device, 21: first main surface, 22: second main surface 32A: printed layer edge, 32B: printed layer flat portion, 32C: printed layer edge, 61: contact end, 61A: tangent, 62A, 62B: angle, 63: contact end, 64A, 64B: angle, 65: Contact end, 65A: tangent, 66A, 66B: angle, 67: contact end, 67A: tangent, 68A, 68B: angle, 70A: tangent, 72A, 72B: angle, 81: upper surface printing layer, 81A: upper surface printing layer edge Part, 81B: Flat part of upper surface printing layer, 81C: Edge part of upper surface printing layer.

Claims (9)

A plate, a plate with a printed layer comprising a printed layer provided on the main surface of the plate,
The printing layer,
A printing layer flat portion having a flat surface, and a printing layer edge portion provided at an end of the printing layer flat portion and having a contact end with the main surface located outside the printing layer flat portion,
In a cross-sectional view orthogonal to the main surface,
A plate with a printing layer, wherein an angle on the printing layer edge side is always less than 90 ° among angles formed by a tangent to the printing layer edge and the main surface. The printing layer,
The board with a printing layer according to claim 1, wherein a maximum thickness of the printing layer edge portion is larger than a thickness of the printing layer flat portion. An upper surface printing layer provided on the upper surface of the printing layer,
The board with a printing layer according to claim 1, wherein the upper surface printing layer is provided inside the printing layer in a plan view. The upper printing layer,
An upper surface printing layer flat portion having a flat surface, and an upper surface printing layer edge provided at an end of the upper surface printing layer flat portion,
In a cross-sectional view orthogonal to the main surface,
The plate with a printing layer according to claim 3, wherein, of the angle between the tangent to the upper printing layer edge and the flat portion of the printing layer, the angle on the upper printing layer edge side is always less than 90 °.   The plate with a print layer according to any one of claims 1 to 4, wherein the print layer has a frame shape in a plan view, and the edge of the print layer is provided at least on an inner peripheral end side of the print layer. .   The board with a printing layer according to any one of claims 1 to 5, wherein the board is glass.   The plate with a printing layer according to claim 6, wherein the glass is made of tempered glass.   A cover member comprising the plate with a print layer according to any one of claims 1 to 7. A cover member according to claim 8,
A display panel,
A display device comprising: an adhesive layer that bonds the cover member and the display panel.

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