Cover plate and display device

Abstract

The present disclosure provides a cover plate and a display device, the cover plate comprising: a substrate, the substrate comprising a first surface and a second surface disposed opposite to each other; an explosion-proof membrane adhered to the first surface of the substrate, the four edges of the explosion-proof membrane being retracted relative to the substrate; and a first ink layer, the first ink layer comprising a first portion and a second portion, the first portion being adhered to an edge region of a side of the explosion-proof membrane away from the substrate, the second portion being formed by the first portion extending along the four edges of the explosion-proof membrane toward the substrate to cover the four edges of the explosion-proof membrane. The cover plate and display device provided by the present disclosure have an explosion-proof membrane edging design that can isolate the four edges of the explosion-proof membrane and prevent water vapor from entering the explosion-proof membrane, thereby improving the problem of glue overflow and other defects that easily occur when the cover plate with the explosion-proof membrane is washed with water, thereby meeting the terminal needs while meeting the cover plate washing requirements.

Description

Technical Field

[0001] The present invention relates to the field of display technology, and in particular to a cover plate and a display device. Background Art

[0002] For flexible display modules, the cover glass, as the top stacking layer of the entire module, has very high cleanliness requirements. During the production, transportation, and handling processes, stains and other defects may remain on the cover glass. If the cover glass with stains is used directly online, it will affect the quality of the display module shipment. Therefore, before the cover glass is used online, there will be a water washing and full inspection process. For conventional cover glass, water washing will not cause defects, but for cover glass with explosion-proof film, since the explosion-proof film is attached to the glass substrate, defects such as glue overflow will often occur during water washing. Summary of the Invention

[0003] The embodiments of the present disclosure provide a cover plate and a display device, which can improve problems such as glue overflow during washing of explosion-proof membranes.

[0004] The technical solutions provided by the embodiments of the present disclosure are as follows:

[0005] A cover plate, comprising:

[0006] a substrate comprising a first surface and a second surface disposed opposite to each other;

[0007] an explosion-proof membrane attached to the first surface of the substrate, wherein four peripheral edges of the explosion-proof membrane are retracted relative to the substrate; and

[0008] The first ink layer includes a first portion and a second portion, the first portion being adhered to an edge area of ​​a side of the explosion-proof membrane facing away from the substrate, and the second portion being formed by extending the first portion along the four edges of the explosion-proof membrane toward the substrate to cover the four edges of the explosion-proof membrane.

[0009] Exemplarily, the explosion-proof film includes an optical adhesive layer and a polyester film stacked in sequence from a side close to the substrate to a side away from the substrate, wherein the second portion at least covers a boundary gap between the optical adhesive layer and the polyester film.

[0010] Exemplarily, the first surface includes a first area and a second area located outside the first area, wherein the first area coincides with the orthographic projection of the explosion-proof membrane in a direction perpendicular to the substrate, the second part coincides with the orthographic projection of the second area in a direction perpendicular to the substrate, and in the direction from the middle area of ​​the first surface to the edge area, the edge of the second part away from the middle area is flush with the edge of the substrate away from the middle area.

[0011] Exemplarily, the first ink layer includes at least two layers of ink.

[0012] Exemplarily, the first ink layer includes only one layer of ink, and the cover plate further includes: a second ink layer, the second ink layer is adhered to the edge area of ​​the first surface, and the second ink layer includes a third part and a fourth part, the third part is adhered to the first area and its orthographic projection in the direction perpendicular to the substrate partially overlaps with the explosion-proof membrane, and the fourth part is adhered to the second area.

[0013] Exemplarily, when the explosion-proof film includes an optical adhesive layer and a polyester film stacked in sequence from a side close to the substrate to a side away from the substrate, the film thickness of the optical adhesive layer in a direction perpendicular to the substrate is greater than the film thickness of the second ink layer in a direction perpendicular to the substrate, and the first area includes a first sub-area bonded to the third part and a second sub-area not bonded to the third part, wherein a portion of the optical adhesive layer is bonded to the side of the third part facing away from the substrate, and the other portion is bonded to the second sub-area of ​​the first surface.

[0014] Exemplarily, the first surface is a plane.

[0015] Exemplarily, the thickness of the second ink layer is less than or equal to 18 micrometers.

[0016] Exemplarily, a first groove is provided in an edge area of ​​the first surface and is recessed toward the second surface, and the second ink layer is adhered to the first groove.

[0017] Exemplarily, a difference between a film thickness of the second ink layer in a direction perpendicular to the substrate and a groove depth of the first groove in a direction perpendicular to the substrate is within a predetermined threshold.

[0018] A display device, comprising:

[0019] display module; and

[0020] The cover plate as described above is attached to the light-emitting side of the display module.

[0021] Exemplarily, the display module includes a display panel and a polarizer adhered to the light-emitting side of the display panel, the cover plate is adhered to the side of the polarizer facing away from the display panel, and a second groove is provided in the edge area of ​​the light-emitting side of the polarizer, and the first part is embedded in the second groove.

[0022] The beneficial effects brought about by the embodiments of the present disclosure are as follows:

[0023] The cover plate and display device provided in the embodiments of the present disclosure are a cover plate with an explosion-proof membrane. By covering the four edges of the explosion-proof membrane with a first ink layer, that is, the explosion-proof membrane is designed with an edge wrapping, the four edges of the explosion-proof membrane can be isolated to prevent water vapor from entering the explosion-proof membrane, thereby improving the problem of glue overflow and other defects caused by the cover plate with the explosion-proof membrane during water washing, thereby meeting the terminal needs while meeting the water washing requirements of the cover plate. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 A schematic structural diagram showing a cover plate provided in an exemplary embodiment of the present disclosure;

[0025] Figure 2 A schematic structural diagram showing a cover plate provided in another exemplary embodiment of the present disclosure;

[0026] Figure 3 A schematic structural diagram of a cover plate provided in another exemplary embodiment of the present disclosure is shown. DETAILED DESCRIPTION

[0027] To make the purpose, technical solutions, and advantages of the embodiments of the present disclosure more clear, the technical solutions of the embodiments of the present disclosure will be clearly and completely described below in conjunction with the accompanying drawings of the embodiments of the present disclosure. Obviously, the described embodiments are part of the embodiments of the present disclosure, not all of the embodiments. Based on the described embodiments of the present disclosure, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present disclosure.

[0028] Unless otherwise defined, the technical or scientific terms used in this disclosure should have the usual meanings understood by people with ordinary skills in the field to which this disclosure belongs. The words "first", "second" and similar words used in this disclosure do not indicate any order, quantity or importance, but are only used to distinguish different components. Similarly, words such as "one", "an" or "the" do not indicate a quantity limitation, but rather indicate the existence of at least one. Words such as "include" or "comprise" mean that the elements or objects appearing before the word include the elements or objects listed after the word and their equivalents, without excluding other elements or objects. Words such as "connect" or "connected" are not limited to physical or mechanical connections, but may include electrical connections, whether direct or indirect. "Up", "down", "left", "right" and the like are only used to indicate relative positional relationships. When the absolute position of the object being described changes, the relative positional relationship may also change accordingly.

[0029] Before describing in detail the cover plate and display device provided by the embodiments of the present disclosure, it is necessary to describe the related technologies as follows:

[0030] In the related art, stains and other defects may be left on the cover during the process of production, transportation, and handling. If the cover with stains is used directly on the line, it will affect the quality of the display module shipment. Therefore, before the cover is used on the line, there will be a process of water washing and full inspection. For conventional cover plates, they mainly include a glass substrate and an ink layer attached to the glass substrate, and basically no defects will occur after water washing. However, for cover plates with explosion-proof membranes, there is also an explosion-proof membrane attached to the side of the glass substrate where the ink is attached, and defects such as glue overflow will often occur during water washing.

[0031] The inventors of this disclosure have discovered that the reason for poor water washing is that the explosion-proof film is primarily composed of an optical adhesive layer (OCA) and a polyester film (PET). The edges of the explosion-proof film are die-cut to the size of the glass substrate. When the cover plate with the explosion-proof film is washed with water, the liquid erodes the glass substrate, causing moisture to enter through the edges of the optical adhesive layer. This can cause defects such as adhesive overflow in the explosion-proof film, significantly wasting raw materials and increasing the manufacturing cost of the display module.

[0032] Therefore, in order to solve the above problems, the embodiments of the present disclosure provide a cover plate and a display device, which can improve the adverse problems caused by washing the cover plate.

[0033] like Figures 1 to 3 As shown, the cover plate 10 provided in the embodiment of the present disclosure includes: a substrate 11, an explosion-proof membrane 12 and a first ink layer 13, the substrate 11 includes a first surface 10a and a second surface 10b arranged opposite to each other; the explosion-proof membrane 12 is adhered to the first surface 10a of the substrate 11, and the four edges of the explosion-proof membrane 12 are retracted relative to the substrate 11; the first ink layer 13 includes a first part 13a and a second part 13b, the first part 13a is adhered to the edge area of ​​the side of the explosion-proof membrane 12 away from the substrate 11, and the second part 13b is formed by the first part 13a extending along the four edges of the explosion-proof membrane 12 toward the substrate 11 to cover the four edges of the explosion-proof membrane 12.

[0034] In the above scheme, the cover plate 10 is a cover plate 10 with an explosion-proof membrane 12. By covering the four edges of the explosion-proof membrane 12 with the first ink layer 13, that is, the explosion-proof membrane 12 is designed to have an edge, the four edges of the explosion-proof membrane 12 can be isolated to prevent water vapor from entering the explosion-proof membrane 12, thereby improving the problem that the cover plate 10 with the explosion-proof membrane 12 is prone to glue overflow during water washing, thereby meeting the terminal needs while meeting the water washing requirements of the cover plate 10.

[0035] As an exemplary embodiment, Figures 1 to 3As shown, the explosion-proof film 12 may include an optical adhesive layer 121 and a polyester film 122 stacked in sequence from the side close to the substrate 11 to the side away from the substrate 11, wherein the second portion 13b at least covers the interface gap between the optical adhesive layer 121 and the polyester film 122 to prevent water vapor from entering through the interface gap between the optical adhesive layer 121 and the polyester film 122. Preferably, as Figures 1 to 3 As shown, the second portion 13b completely covers the four edges of the optical adhesive layer 121 to further achieve a better water vapor isolation effect.

[0036] In addition, as an exemplary embodiment, Figures 1 to 3 As shown, the first surface 10a includes a first region A and a second region B located outside the first region A. The first region A coincides with the orthographic projection of the explosion-proof membrane 12 in a direction perpendicular to the substrate 11, and the second portion 13b coincides with the orthographic projection of the second region B in a direction perpendicular to the substrate 11. Furthermore, in a direction from the middle region of the first surface 10a toward the edge region, the edge of the second portion 13b away from the middle region is flush with the edge of the substrate 11 away from the middle region. With this solution, the outer edge of the first ink layer 13 (i.e., the edge away from the middle region) is roughly flush with the outer edge of the substrate 11 (i.e., the edge away from the middle region), which does not affect the appearance of the display module.

[0037] It should be noted that the edge of the second part 13b away from the middle area is flush with the edge of the substrate 11 away from the middle area. Here, it means that the edge of the second part 13b away from the middle area is roughly flush with the edge of the substrate 11 away from the middle area, for example, the step difference between the two is less than or equal to 1 micron.

[0038] In addition, in the related art, since the explosion-proof film 12 is attached to the substrate 11, and since there is ink on the four sides of the surface of the substrate 11, and in order to meet the customer's needs for light shielding and light transmission, a double layer of ink is generally used, with a thickness of approximately 18 microns. In the related art, the double layer of ink is attached between the explosion-proof film 12 and the substrate 11, and there will be a step between the double layer of ink and the surface of the substrate 11. When the explosion-proof film 12 is attached to the substrate 11, the step of the double layer of ink can only be absorbed by the optical adhesive layer 121 on the explosion-proof film 12. Since the thickness of the optical adhesive layer 121 (about 25 microns) is not much different from the thickness of the double layer of ink, this will cause small bubbles to appear in the corners of the ink, thereby affecting the display effect. The traditional method to solve the above-mentioned poor lamination of bubbles is to use a single layer of ink to reduce the step, but this will affect the ink function, and the other is to thicken the optical adhesive layer 121 in the explosion-proof film 12, but this will increase the thickness of the module.

[0039] In order to solve the above-mentioned problem of poor bonding, in the embodiment of the present disclosure, as Figure 1 As shown, in some embodiments, the first ink layer 13 includes at least two layers of ink. Thus, since the first portion 13a of the first ink layer 13 is attached to the surface of the polyester film 122 in the explosion-proof membrane 12, which is away from the substrate 11, the optical adhesive layer 121 can be directly attached to the first surface 10a of the substrate 11 without printing ink between the optical adhesive layer 121 and the substrate 11. Therefore, the optical adhesive layer 121 does not need to compensate for the step difference of the first ink layer 13. Therefore, the film thickness of the optical adhesive layer 121 can be unlimited and will not increase the thickness of the module. Furthermore, the first ink layer 13 can be at least two layers of ink. For example, the film thickness of each single layer of ink in the first ink layer 13 can be approximately 9 microns, which does not affect the ink function.

[0040] In addition, it should be noted that the first ink layer 13 may also be a single layer of ink with a thickness that satisfies the light shielding and light transmitting functions of the ink. For example, the first ink layer 13 may be a single layer of ink with a thickness of about 18 microns.

[0041] The structure of the cover plate 10 after being attached to the display module in this embodiment is as follows: Figure 1 As shown, the manufacturing process of the display device can be as follows:

[0042] First, the explosion-proof film 12 is attached to the first surface 10a of the first substrate 11;

[0043] Then, a double layer of ink (i.e., the first ink layer 13) is printed onto the polyester film 122 of the explosion-proof membrane 12, with a portion of the double layer of ink located on the side of the polyester film 122 facing away from the substrate 11, and the other portion covering the optical adhesive layer 121 and the four edges of the polyester film 122.

[0044] In another exemplary embodiment provided by the present disclosure, Figure 2As shown, the first ink layer 13 may also include only one layer of ink, that is, the first ink layer 13 is a single layer of ink. The cover plate 10 may also include: a second ink layer 14, the second ink layer 14 is attached to the edge area of ​​the first surface 10a, and the second ink layer 14 includes a third portion 14a and a fourth portion 14b. The third portion 14a is attached to the first area A and its orthographic projection in a direction perpendicular to the substrate 11 partially overlaps with the explosion-proof membrane 12. The fourth portion 14b is attached to the second area B. Exemplarily, when the explosion-proof film 12 includes an optical adhesive layer 121 and a polyester film 122 stacked in sequence from the side close to the substrate 11 to the side away from the substrate 11, the film thickness of the optical adhesive layer 121 in the direction perpendicular to the substrate 11 is greater than the film thickness of the second ink layer 14 in the direction perpendicular to the substrate 11, and the first area A includes a first sub-area A1 bonded to the third part 14a and a second sub-area A2 not bonded to the third part 14a, wherein a portion of the optical adhesive layer 121 is bonded to the side of the third part 14a facing away from the substrate 11, and the other portion is bonded to the second sub-area A2 of the first surface 10a.

[0045] Using the above solution, in some exemplary embodiments, the ink layer on the cover plate 10 can be divided into two single ink layers, namely a first ink layer 13 and a second ink layer 14, wherein the second ink layer 14 can be directly printed on the first surface 10a of the substrate 11, and the explosion-proof membrane 12 can be attached to the second ink layer 14, and the step difference between the second ink layer 14 and the first surface 10a of the substrate 11 is only the thickness of a single layer of ink, for example, 9 microns. The optical adhesive layer 121 in the explosion-proof membrane 12 can compensate for the step difference caused by the second ink layer 14, and the film thickness of the optical adhesive layer 121 does not need to be too thick, and will not increase the module thickness. The second ink layer 14 can be printed on the surface of the polyester film 122 of the explosion-proof membrane 12 and the edge of the entire explosion-proof membrane 12 to wrap the explosion-proof membrane 12 and isolate it from water vapor, thereby meeting the terminal needs and the water washing requirements.

[0046] It should be noted that in the above embodiment, the first surface 10a can be a plane. When laminating with the display module, since the thickness of the optical adhesive layer 121 is greater than the thickness of a single layer of ink (i.e., the second ink layer 14), the step difference of the single layer of ink can be absorbed during lamination.

[0047] Exemplarily, the second ink layer 14 has a thickness of less than or equal to 18 microns. For example, the thickness of the first ink layer 13 and the second ink layer 14 can both be approximately 9 microns. It is understood that the thickness of the first ink layer 13 and the second ink layer 14 is not limited thereto.

[0048] by Figure 2 Taking the embodiment shown as an example, the manufacturing process of the cover plate 10 can be as follows:

[0049] First, the second ink layer 14 is printed on the first surface 10a of the substrate 11;

[0050] Then, the explosion-proof membrane 12 is attached to the first surface 10a of the substrate 11;

[0051] Then, the first ink layer 13 is printed on the surface of the polyester film 122 of the explosion-proof membrane 12 which is away from the substrate 11 , and the first ink layer 13 surrounds the explosion-proof membrane 12 .

[0052] In addition, as another exemplary embodiment, Figure 3 As shown, a first groove 10c is provided in the edge area of ​​the first surface 10a, which is recessed toward the second surface 10b, and the second ink layer 14 is adhered to the first groove 10c.

[0053] In this embodiment, since the thickness of the single-layer ink and the optical adhesive layer 121 in the explosion-proof membrane 12 are of the same order of magnitude, an improved two-layer ink wrapping design for the explosion-proof membrane 12 is proposed without increasing the thickness of the single-layer ink. The substrate 11 is processed to provide grooves in the areas where the second ink layer 14 is bonded to the four sides, forming first grooves 10c. The depth of the first grooves 10c can be determined based on the thickness of the selected second ink layer 14. Compared to the cover plate 10 in the illustrated embodiment, the cover plate 10 in this embodiment has the second ink layer 14 filling the first grooves 10c. When bonding the explosion-proof membrane 12, the step between the second ink layer 14 and the first surface 10a of the substrate 11 is further reduced, or even eliminated. This solves the problem of bubbles forming when bonding the explosion-proof membrane 12 without increasing the thickness of the optical adhesive layer 121 of the explosion-proof membrane 12.

[0054] Exemplarily, the difference between the film thickness of the second ink layer 14 in a direction perpendicular to the substrate 11 and the groove depth of the first groove 10c in a direction perpendicular to the substrate 11 is within a predetermined threshold, so that the height difference between the second ink layer 14 on the side facing away from the second surface 10b and the first surface 10a is less than a predetermined value.

[0055] It should be noted here that the ideal value of the step difference between the second ink layer 14 and the first surface 10a is 0, but there may be precision errors during the process of manufacturing. The predetermined threshold can be the process error that exists when the second ink layer 14 is formed in the first groove 10c, or it can be an artificially set step difference value.

[0056] The manufacturing process of the cover plate 10 in this embodiment can be as follows:

[0057] First, a first groove 10c is formed on the first surface 10a of the substrate 11;

[0058] Then, a single layer of ink is screen-printed in the first groove 10c to fill the step difference, thereby forming the second ink layer 14;

[0059] Then, the explosion-proof membrane 12 is attached to the first surface 10a;

[0060] Finally, another single layer of ink is printed on the explosion-proof membrane 12 , that is, the first ink layer 13 is formed.

[0061] In addition, if Figures 1 to 3 As shown, an embodiment of the present disclosure further provides a display device, which may include: a display module 20 and a cover plate 10 provided in an embodiment of the present disclosure, wherein the cover plate 10 is attached to the light-emitting side of the display module 20. Exemplarily, the display module 20 includes a display panel 21 and a polarizer 22 attached to the light-emitting side of the display panel 21, the cover plate 10 is attached to the side of the polarizer 22 facing away from the display panel 21, and a second groove 221 is provided in the edge region of the light-emitting side of the polarizer 22, and the first portion 13a is embedded in the second groove 221.

[0062] There are a few points to note:

[0063] (1) The drawings of the embodiments of the present disclosure only relate to the structures related to the embodiments of the present disclosure. Other structures may refer to conventional designs.

[0064] (2) For the sake of clarity, the thickness of layers or regions in the drawings used to describe the embodiments of the present disclosure are exaggerated or reduced, i.e., these drawings are not drawn to scale. It is understood that when an element such as a layer, film, region, or substrate is referred to as being "on" or "under" another element, the element may be "directly" "on" or "under" the other element or intervening elements may be present.

[0065] (3) In the absence of conflict, the embodiments of the present disclosure and the features therein may be combined with each other to form new embodiments.

[0066] The above are only specific embodiments of the present disclosure, but the protection scope of the present disclosure is not limited thereto. The protection scope of the present disclosure should be based on the protection scope of the claims.

Claims

1. A cover plate, used to be attached to the light-emitting side of a display module; characterized in that: The cover plate comprises: a substrate, the substrate comprising a first surface and a second surface disposed opposite to each other, the first surface being a side facing the display module; an explosion-proof membrane attached to the first surface of the substrate, wherein four peripheral edges of the explosion-proof membrane are retracted relative to the substrate; and a first ink layer, the first ink layer comprising a first portion and a second portion, the first portion being adhered to an edge region of a side of the explosion-proof membrane facing away from the substrate, the second portion being formed by the first portion extending along four peripheral edges of the explosion-proof membrane toward the substrate to cover four peripheral edges of the explosion-proof membrane; the explosion-proof membrane comprising an optical adhesive layer and a polyester film stacked sequentially from a side close to the substrate to a side away from the substrate, wherein the second portion at least covers a boundary gap between the optical adhesive layer and the polyester film; The cover plate further includes: a second ink layer, the second ink layer is adhered to the edge area of ​​the first surface, the edge area of ​​the first surface is provided with a first groove that is concave toward the second surface, and the second ink layer is adhered to the first groove.

2. The cover plate according to claim 1, wherein: The first surface includes a first area and a second area located outside the first area, wherein the first area coincides with the orthographic projection of the explosion-proof membrane in a direction perpendicular to the substrate, the second part coincides with the orthographic projection of the second area in a direction perpendicular to the substrate, and in the direction from the middle area of ​​the first surface to the edge area, the edge of the second part away from the middle area is flush with the edge of the substrate away from the middle area.

3. The cover plate according to claim 2, wherein: The first ink layer includes at least two layers of ink.

4. The cover plate according to claim 2, wherein: The first ink layer includes only one layer of ink, and the second ink layer includes a third part and a fourth part, the third part is adhered to the first area and its orthographic projection in a direction perpendicular to the substrate partially overlaps with the explosion-proof membrane, and the fourth part is adhered to the second area.

5. The cover plate according to claim 4, characterized in that: When the explosion-proof film includes an optical adhesive layer and a polyester film stacked in sequence from a side close to the substrate to a side away from the substrate, the film thickness of the optical adhesive layer in a direction perpendicular to the substrate is greater than the film thickness of the second ink layer in a direction perpendicular to the substrate, and the first area includes a first sub-area to which the third part is bonded and a second sub-area not bonded to the third part, wherein a portion of the optical adhesive layer is bonded to a side of the third part facing away from the substrate, and the other portion is bonded to the second sub-area of ​​the first surface.

6. The cover plate according to claim 5, characterized in that: The first surface is a plane.

7. The cover plate according to claim 6, characterized in that: The thickness of the second ink layer is less than or equal to 18 micrometers.

8. The cover plate according to claim 1, wherein: A difference between a film thickness of the second ink layer in a direction perpendicular to the substrate and a groove depth of the first groove in a direction perpendicular to the substrate is within a predetermined threshold.

9. A display device, characterized in that: include: Display module; and The cover plate according to any one of claims 1 to 8, wherein the cover plate is attached to a light-emitting side of the display module.

10. The display device according to claim 9, wherein: The display module includes a display panel and a polarizer adhered to the light-emitting side of the display panel. The cover plate is adhered to the side of the polarizer facing away from the display panel, and a second groove is provided in the edge area of ​​the light-emitting side of the polarizer, and the first part is embedded in the second groove.

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