Display device and cover plate therefor

Abstract

The technical scheme of the present application discloses a display device and a cover plate thereof, the cover plate is used for a display panel, comprising: a transparent substrate having opposite first and second surfaces, the second surface is used for facing the display surface of the display panel; an electrostatic discharge layer located on the first surface, the impedance of the electrostatic discharge layer in the first direction is less than that in the second direction; wherein, the first direction is parallel to the first surface, and the second direction is perpendicular to the first surface. The technical scheme of the present application makes the cover plate have static electricity on the side close to the first surface, and the static electricity can be transmitted from the middle area of the cover plate to the edge area in the direction parallel to the first surface, so as to realize the horizontal release of static electricity, avoid the transmission of static electricity in the direction perpendicular to the first surface towards the display panel, thereby avoiding the generation of induced charge in the display panel, and further avoiding the display problem caused thereby.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of display devices, and more particularly, to a display device and a cover plate thereof. BACKGROUND

[0002] With the continuous progress of science and technology, more and more display devices are widely used in people's daily life and work, which brings great convenience to people's daily life and work and becomes an indispensable important tool for people today.

[0003] At present, the display device generally adopts a touch display panel, which can respond to user touch operations to facilitate touch detection while realizing image display functions. When performing touch operations, static electricity will be formed on the surface of the display device, which will cause electromagnetic interference and affect the image display quality. Especially for OLED display devices sensitive to static electricity, static electricity will cause the electrical properties of OLED light emitting elements to deviate, resulting in display unevenness and display defects such as stripes.

[0004] Therefore, how to integrate an effective anti-static structure in the display device is a problem to be solved in the technical field of display devices. SUMMARY

[0005] Therefore, the present application provides a display device and a cover plate thereof, and the scheme is as follows:

[0006] A cover plate for a display panel, the cover plate comprising:

[0007] A transparent substrate having opposite first and second surfaces, the second surface being configured to face a display surface of the display panel;

[0008] An electrostatic discharge layer located on the first surface, the electrostatic discharge layer having a smaller impedance in a first direction than in a second direction;

[0009] wherein the first direction is parallel to the first surface and the second direction is perpendicular to the first surface.

[0010] The present application also provides a display device, comprising:

[0011] A display panel;

[0012] The cover plate described above; the cover plate is arranged on the display surface of the display panel.

[0013] It can be known from the above description that the display device and the cover plate thereof provided by the technical scheme have the following advantages: the static electricity releasing layer is arranged on the first surface of the cover plate away from the display surface of the display panel, the impedance of the static electricity releasing layer in the first direction is smaller than the impedance in the second direction, so that the conductivity of the static electricity releasing layer has anisotropy, the conductivity in the first direction is stronger than the conductivity in the second direction, so that when the cover plate is close to the first surface and has static electricity, the static electricity can be transmitted from the middle area of the cover plate to the edge area in the direction parallel to the first surface, so that the horizontal release of the static electricity is realized, the transmission of the static electricity in the direction perpendicular to the first surface towards the display panel is avoided, so that the induced charge in the display panel is avoided, and then the display problem caused by the induced charge is avoided. BRIEF DESCRIPTION OF DRAWINGS

[0014] In order to more clearly illustrate the technical scheme in the embodiments of the present application or the related art, the drawings needed to be used in the embodiments or the prior art description will be briefly introduced below. Obviously, the drawings in the following description are only embodiments of the present application, and those skilled in the art can obtain other drawings according to the provided drawings without any creative effort.

[0015] The structures, proportions, sizes, etc. shown in the drawings of the present specification are only used to cooperate with the content disclosed in the present specification, so that those skilled in the art can understand and read, and are not used to limit the conditions that can be implemented by the present application. Therefore, any modification of the structure, change of the proportion relationship or adjustment of the size, which does not affect the effect and the purpose that can be achieved by the present application, should still fall within the scope of the technical content disclosed by the present application.

[0016] Figure 1 It is a structural schematic diagram of a display device with an anti-static function;

[0017] Figure 2 It is a structural schematic diagram of a cover plate provided by the embodiments of the present application;

[0018] Figure 3 It is a structural schematic diagram of a static electricity releasing layer provided by the embodiments of the present application;

[0019] Figure 4 It is a schematic diagram of different distribution states of conductive particles in a static electricity releasing layer provided by the embodiments of the present application;

[0020] Figure 5 It is another structural schematic diagram of a static electricity releasing layer provided by the embodiments of the present application;

[0021] Figure 6 It is another structural schematic diagram of a cover plate provided by the embodiments of the present application, based on the above embodiments;

[0022] Figure 7 Another structure diagram of a cover plate provided by an embodiment of the present application is shown in FIG. 6;

[0023] Figure 8 Another structure diagram of a cover plate provided by an embodiment of the present application is shown in FIG. 6, based on the above embodiment;

[0024] Figure 9 A structure diagram of a display device provided by an embodiment of the present application is shown in FIG. 7. DETAILED DESCRIPTION

[0025] The embodiments in the present application will be described clearly and completely with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative labor fall within the scope of the present application.

[0026] When a user performs a touch operation on the display device, static electricity will be generated on the surface of the display device. If the display device has no effective static electricity leading path, when static electricity changes occur outside the display device, due to static electricity induction, induced charges will be generated in the display panel, which will interfere with the display control signals transmitted by the signal lines in the display panel, thereby causing display unevenness and other display problems such as stripes. Taking an OLED display device as an example, since the OLED light-emitting element is sensitive to static electricity, the induced charges caused by static electricity will cause the OLED light-emitting element to deviate in electrical properties, resulting in a problem of stealing light when it is not necessary to light up, and a problem of brightness and color deviation due to electrical property deviation when it is necessary to light up, resulting in display unevenness and other display problems such as stripes.

[0027] In order to prevent static electricity interference, a conventional implementation is shown in FIG. 1. Figure 1

[0028] Referring to FIG. 2, Figure 1 Figure 1 A structure diagram of a display device with an anti-static function is shown in FIG. 3, which includes:

[0029] A display panel 11 has a first surface and a second surface arranged oppositely, wherein the first surface is the display surface of the display panel 11;

[0030] A cover plate 12 is arranged on the first surface, and the cover plate 12 is fixed on the first surface of the display panel 11 by optical adhesive 13;

[0031] A back support structure 14 is arranged on the second surface, and the back support structure 14 includes a support plate 141 and a plurality of support columns 142 arranged on the support plate 141 in a direction perpendicular to the display panel 11 (i.e. Figure 1 ​​a plurality of functional layers stacked in sequence in a vertical direction (a direction perpendicular to the display panel 11). Figure 1 In the manner shown, in the direction in which the first surface of the display panel 11 points to the second surface, the back support structure 14 at least includes a plurality of layers stacked in sequence, a prosthetic adhesive tape 141, a foam 142, and a metal layer 143, which can be a Cu layer.

[0032] If the display panel is an OLED panel, in order to reduce the reflectivity of the display panel to external ambient light, the first surface of the display panel 11 can be provided with a polarizer 15. The cover plate 12 is fixed by optical adhesive 13 on the side of the polarizer 15 away from the display panel 11.

[0033] The conductive layer in the display panel 11 is electrically connected to the metal layer 143 in the back support structure 14 through a flexible circuit board 16. Specifically, one end of the flexible circuit board 16 is connected to the conductive layer in the display panel 11, and the other end is bent to the back of the display device and connected to the metal layer 143 in the back support structure 14 through a conductive cloth 17.

[0034] Figure 1 The working principle of the anti-static display device shown is as follows: when the cover plate 12 generates static electricity 151 due to touch operation or other factors, due to static induction, induced charge 152 is generated in the conductive layer in the display panel 11. The induced charge 152 is conducted to the metal layer 143 in the back support structure 14 through the flexible circuit board 16 and the conductive cloth 17 for release.

[0035] Taking the display panel 11 as an OLED display panel, although Figure 1 The display device shown can achieve the effect of anti-static to some extent, but test results show that when a large amount of static electricity is generated by rubbing a copper rod, the electric charge is easily transmitted downward to the inside of the display panel. The OLED light-emitting element in the display panel still has the problems of display defects such as light stealing, uneven display, and stripes due to static electricity. This is because when a large amount of static electricity 151 is generated on the surface of the cover plate 11, Figure 1 Although the display device shown can release the induced charge 152, there is no discharge path for the static electricity 151 on the surface of the cover plate 11, and the static electricity 151 on the surface of the cover plate 11 cannot be released in time, which still has certain electromagnetic interference to the display panel 11.

[0036] It should be noted that the display device in the embodiments of the present application is taken as an OLED display device for illustration. Apparently, in the embodiments of the present application, the display device is not limited to the OLED display device, but can also be other types of display devices, such as LCD display devices, electronic paper display devices, LED display devices, and micro-LED display devices, and the like. When these display devices are interfered by static electricity, display defects will occur. In the embodiments of the present application, the type of the display device is not specifically limited.

[0037] Therefore, the embodiments of the present application provide a display device and a cover plate thereof. In the technical solutions of the embodiments of the present application, an electrostatic discharge layer is arranged on a first surface of the cover plate away from a display surface of a display panel. The impedance of the electrostatic discharge layer in a first direction is smaller than the impedance in a second direction, so that the electroconductivity of the electrostatic discharge layer has anisotropy. The electroconductivity in the first direction is stronger than the electroconductivity in the second direction. When static electricity exists on the side of the cover plate close to the first surface, the static electricity can be transmitted from the middle area of the cover plate to the edge area in the direction parallel to the first surface, so as to realize horizontal discharge of the static electricity, avoid transmission of the static electricity in the direction perpendicular to the first surface towards the display panel, and thus avoid generation of induced charges in the display panel, and further avoid display defects caused thereby.

[0038] In order to make the above objectives, characteristics and advantages of the present application more apparent and understandable, the present application will be further described in detail below with reference to the accompanying drawings and specific embodiments.

[0039] Reference Figure 2 as shown, Figure 2 The structure of a cover plate provided by the embodiments of the present application is shown in FIG. 1. The cover plate is used for a display panel, such as an OLED display panel. Figure 2 as shown, the cover plate includes:

[0040] A transparent substrate 21 has opposite first and second surfaces S1 and S2. The second surface S2 is used to face the display surface of the display panel.

[0041] An electrostatic discharge layer 22 is arranged on the first surface S1. The impedance of the electrostatic discharge layer 22 in a first direction X is smaller than the impedance in a second direction Y.

[0042] The first direction X is parallel to the first surface S1, and the second direction Y is perpendicular to the first surface S1.

[0043] The cover plate provided by the embodiment of the present application is provided with an electrostatic discharge layer 22 on the first surface S1 of the cover plate away from the display surface of the display panel. The impedance of the electrostatic discharge layer 22 in the first direction X is smaller than the impedance in the second direction Y, so that the electroconductivity of the electrostatic discharge layer 22 is anisotropic, and the electroconductivity in the first direction X is stronger than the electroconductivity in the second direction Y. When the cover plate is electrostatic, the electrostatic can be transmitted from the middle area of the cover plate to the edge area in the direction parallel to the first surface S1, so as to realize the horizontal discharge of the electrostatic, avoid the transmission of the electrostatic in the direction perpendicular to the first surface to the display panel, and thus avoid the generation of induced charges in the display panel, and further avoid the display defect problem caused thereby.

[0044] Moreover, in the technical scheme of the embodiment of the present application, the electrostatic can be transmitted from the middle area of the cover plate to the edge area in the direction parallel to the first surface S1, so as to avoid the accumulation of the electrostatic in the middle area of the cover plate, and thus avoid the generation of induced charges in the display panel below, and avoid the display defect problem caused thereby.

[0045] The transparent substrate 21 can be a glass substrate, a transparent plastic plate or a plate of other transparent insulating material. The material of the transparent substrate 21 can be selected based on the requirement, and the material of the transparent substrate 21 is not specifically limited.

[0046] As described above, in the cover plate provided by the embodiment of the present application, the impedance of the electrostatic discharge layer 22 in the first direction X is smaller than the impedance in the second direction Y, so as to reduce the horizontal resistance of the cover plate, increase the vertical resistance of the cover plate, and realize that when the cover plate is electrostatic due to the friction surface, the horizontal friction electrostatic can be reduced, and the transmission of the electrostatic through the cover plate to the display panel below the cover plate is hindered, so as to solve the display defect problem caused by the electrostatic, avoid the interference of the electrostatic on the display panel, and improve the anti-static performance of the display device.

[0047] The experimental results show that, compared with the prior art, Figure 1 As shown in the figure, when the display device is rubbed by a copper rod to generate a large amount of electrostatic on the surface of the display device, the display device using the cover plate provided by the embodiment of the present application has a significantly improved anti-static performance, and can effectively prevent the display defect problem caused by the electrostatic.

[0048] Referring to Figure 3 and Figure 4 As shown in the figure, Figure 3 is a structural schematic diagram of an electrostatic discharge layer provided by the embodiment of the present application, Figure 4 is a schematic diagram of different distribution states of conductive particles in an electrostatic discharge layer provided by the embodiment of the present application. In this mode, the electrostatic discharge layer 22 includes:

[0049] The conductive grid 31 is arranged on the first surface, and the conductive grid 31 has a plurality of grid units 311;

[0050] The conductive particles 32 are located in the grid units 311;

[0051] The plurality of conductive particles 32 in the same grid unit 311 have different distribution states in the presence and absence of static electricity. Specifically, Figure 4 A schematic diagram of different distribution states of the conductive particles in the static electricity release layer is provided for the embodiments of the present application, as shown in the left part of FIG. 2, Figure 4 As shown in the right part of FIG. 2, the conductive particles 32 are gathered in the grid units 311 in the presence of static electricity. Figure 4

[0052] When a touch operation is performed, the friction between the finger and the cover plate surface causes static electricity, and the static electricity release layer 22 is deformed to cause the conductive particles 32 to gather. The reason why the static electricity release layer 22 is deformed to cause the conductive particles 32 to gather due to the friction is that, if the sliding friction on the cover plate surface causes the space in the grid unit 311 to have a compression deformation component in the sliding direction, the distance between the conductive particles 32 in the grid unit 311 is reduced, and the conductive particles 32 gather. If the pressing friction on the cover plate surface causes the static electricity release layer 22 to be concave downward, the horizontal component of the concave deformation reduces the distance between the conductive particles 32, and the conductive particles 32 gather.

[0053] The minimum distance between the adjacent conductive particles 32 is different in the presence and absence of static electricity, and the resistance of the static electricity release layer 22 in the first direction X is related to the minimum distance. The smaller the minimum distance, the smaller the resistance, and vice versa. The conductive particles 32 are dispersedly distributed in the grid units 311 in the absence of static electricity, and the minimum distance between the adjacent conductive particles 32 is L1. The conductive particles 32 are gathered in the grid units 311 in the presence of static electricity, and the minimum distance between the adjacent conductive particles 32 is L2. L2 is smaller than L1, and L2 is greater than or equal to 0. Because L2 is smaller than L1, the resistance of the static electricity release layer 22 in the first direction X is smaller in the presence of static electricity, so that the static electricity is transmitted from the middle to the edge in the plane where the static electricity release layer 22 is located, and the accumulation of static electricity on the cover plate is avoided.

[0054] The display device has a display area and a frame area surrounding the display area. Because the embodiments of the present application can make the static electricity on the cover plate transmitted from the middle to the edge, the static electricity is conducted from the display area to the frame area, and the interference of the static electricity on the image display effect of the pixels in the display area is avoided.

[0055] ​The shape of the grid unit 311 in the conductive grid 31 can be polygon, circle, ellipse, etc.

[0056] Reference Figure 5 As shown, Figure 5 Another structure diagram of the electrostatic discharge layer provided by the embodiment of the present application is shown in the following figure, Figure 5 In the electrostatic discharge layer shown, the conductive grid 31 includes a graphene film. This mode is based on the unique two-dimensional honeycomb form grid structure of the two-dimensional graphene material, and six carbon atoms 312 form an equilateral hexagonal structure in the two-dimensional plane. The grid pattern is directly based on the inherent grid structure of the two-dimensional graphene material, and does not need to be prepared by a separate process. Moreover, the graphene material has good conductivity in the two-dimensional plane, and the electrical conductivity is 455 S / cm.

[0057] The conductive grid 31 can be provided to include at least one graphene film. Alternatively, in the embodiment of the present application, the conductive grid 31 is provided to include one graphene film. When the graphene film is used as the conductive grid 31, by matching the conductive particles 32, the electrostatic discharge layer 22 can achieve good electrostatic discharge function in the first direction, and the resistance in the second direction is larger than that in the first direction, preventing the electrostatic discharge from being conducted downward to the display panel. Obviously, in other modes, the conductive grid 31 can also be provided to include multiple graphene films.

[0058] In the embodiment of the present application, when the graphene film is used as the conductive grid 31, the thickness of the graphene film is set to 10 nm-20 nm. In this thickness range, the graphene film is relatively thin while ensuring the integrity of the two-dimensional honeycomb lattice structure, and has a relatively high light transmittance, with a visible light transmittance of more than 85%.

[0059] In the embodiment of the present application, the conductive particles 32 are metal particles with a particle size of not more than 10 nm, for example, the particle size of the conductive particles 32 can be 1 nm, 3 nm or 4 nm, etc. The conductive particles 32 are set to be metal particles of nanometer size, which can improve the anti-static performance of the display device while avoiding the influence of too large particles on the light-emitting display effect of the display panel.

[0060] The conductive particles 32 can be mixed in the elastic colloidal base material. When there is no static electricity, the conductive particles 32 have the elastic colloidal base material therebetween, and when there is static electricity, the static electricity causes the conductive particles 32 to converge and elastically compress the elastic colloidal base material therebetween. When the static electricity disappears, the restoring force based on the elastic deformation of the colloidal base material causes the conductive particles 32 to return to the initial dispersed distribution state.

[0061] Reference Figure 6 As shown, Figure 6 Another structure diagram of the cover plate provided by the embodiment of the present application is shown in the following figure, based on the above embodiment,Figure 6 In the illustrated configuration, the electrostatic discharge layer 22 includes a metal mesh layer 41 and an anisotropic conductive adhesive layer 42 stacked in the second direction X. In this configuration, the metal mesh layer 41 with the desired pattern structure can be formed by etching the metal layer. The mesh pattern structure can be set according to requirements, and the metal mesh layer 41 in the electrostatic discharge layer 22 can have various design methods, not limited to the molecular lattice structure.

[0062] Among them, the metal mesh has good conductivity and can better gather and transmit the anisotropic conductive adhesive layer 42. Due to static electricity, a transverse current is generated to quickly conduct static electricity from the display area of ​​the display device to the bezel area.

[0063] exist Figure 6 In the illustrated configuration, the metal mesh layer 41 is located on the first surface S1, and the anisotropic conductive adhesive layer 42 is located on the side of the metal mesh layer 41 facing away from the first surface S1, filling the mesh structure of the metal mesh layer 41. In this configuration, the desired patterned metal mesh layer 41 is first formed on the first surface S1, and then the anisotropic conductive adhesive layer 42 is formed on top of the metal mesh layer 41. The anisotropic conductive adhesive layer 42 can achieve better surface flatness and also allows the metal mesh layer 41 to adhere better to the first surface S1, ensuring the adhesion stability and reliability between the film layers.

[0064] refer to Figure 7 As shown, Figure 7 This is a schematic diagram of the structure of another cover plate provided in an embodiment of this application, and... Figure 6 The difference shown is that, Figure 7 In the illustrated configuration, the anisotropic conductive adhesive layer 42 is located on the first surface S1, and the metal mesh layer 41 is located on the side of the anisotropic conductive adhesive layer 42 facing away from the first surface S1. In this configuration, the metal mesh layer 41 is closer to the touch surface of the cover plate, enabling it to accumulate static electricity more quickly and conduct it more rapidly from the display area of ​​the display device to the bezel area.

[0065] exist Figure 7 In the illustrated configuration, to ensure the flatness of the outer surface of the cover plate, a planarization layer covering the metal mesh layer 41 may be provided. This planarization layer may reuse the insulating protective layer described in the following embodiments.

[0066] refer to Figure 8 As shown, Figure 8 This is a schematic diagram of another cover plate provided in an embodiment of this application. Based on the above embodiments, Figure 8The cover plate also includes an insulating protective layer 23 located on the side of the electrostatic discharge layer 22 facing away from the first surface S1. The insulating protective layer 23 is used at least to prevent the electrostatic discharge layer 22 from being abraded due to touch operation. Further, the insulating protective layer 23 can also be configured as an anti-fingerprint film to reduce the visibility of fingerprint oil during touch operation, thereby playing an anti-fingerprint role.

[0067] In Figure 8 In the illustrated manner, only the electrostatic discharge layer 22 is based on Figure 1 The illustrated manner is only illustrative, and obviously, the cover plate provided by the embodiments of the present application can be based on any of the above-described manners to configure the insulating protective layer 23, and the embodiments of the present application will not be described again.

[0068] In the embodiments of the present application, the cover plate is used in a display device. Since the embodiments of the present application enable electrostatic discharge to be transmitted from the middle to the edge of the cover plate, the electrostatic discharge is conducted from the display area to the frame area, thereby avoiding the accumulation of electrostatic discharge above the display area, and thus avoiding the adverse effects of electrostatic discharge on the display effect. Moreover, compared with Figure 1 In the illustrated manner, the cover plate provided by the embodiments of the present application can effectively avoid the adverse effects of electrostatic discharge on the display effect, even if there is no conductive path for transmitting electrostatic discharge to the metal layer on the back of the display device, since the electrostatic discharge is conducted to the frame area away from the display area.

[0069] Based on the above-described embodiments, another embodiment of the present application further provides a display device, as shown in Figure 9

[0070] Referring to Figure 9 Figure 9 FIG. 1 is a structural schematic diagram of a display device provided by an embodiment of the present application. The display device includes:

[0071] a display panel 51;

[0072] a cover plate 52 as described in any of the above-described embodiments, which is arranged on the display surface of the display panel 51.

[0073] In the embodiments of the present application, the display device includes, but is not limited to, a mobile phone, a tablet computer, a smart wearable device, and other electronic devices with display functions.

[0074] When a user's finger 53 performs a touch operation on the display device, electrostatic discharge 54 is generated at the touch position when the finger 53 touches the cover plate 52. Generally, the touch position is in the display area of the display device. Since the cover plate 52 described in the above-described embodiments enables electrostatic discharge to be transmitted from the middle to the edge of the cover plate 52, the electrostatic discharge 54 is transmitted in the first direction X away from the display panel 51, thereby avoiding the adverse effects of electrostatic discharge on the display effect of the display panel 51. ​​

[0075] Since the embodiment of the present application can make the static electricity of the cover plate 52 transfer from the middle to the edge, thereby conducting the static electricity from the display area to the frame area, the static electricity is avoided from gathering above the display area, thereby avoiding the adverse effect of the static electricity on the display effect. Moreover, compared with the prior art, the embodiment of the present application can avoid the static electricity from gathering on the display area, thereby avoiding the adverse effect of the static electricity on the display effect. Figure 1 As shown in the manner of Figure 8 As shown in the manner of

[0076] In the embodiment of the present application, the cover plate 52 can be a flat cover plate, which has a first area and a second area surrounding the first area, the first area is arranged opposite to the display area of the display device, and the second area is arranged opposite to the frame area of the display device. At this time, in the second direction Y, the second area has no overlapping part with the display panel 51, and the static electricity 54 is conducted to the edge position of the second area, so that even if the static electricity 54 cannot be released in time at the edge of the cover plate 52, the influence on the display panel is very small, or even no influence.

[0077] In addition, at least part of the static electricity 54 can be consumed in the horizontal transmission process, and after the static electricity 54 is transmitted away from the area of the display panel 51, the interference of the static electricity 54 on the display panel is further reduced, so that the conductive path of the metal layer on the back of the display device becomes unnecessary design, and the static electricity 54 at the edge of the cover plate 52 can be naturally released by contacting other objects during use.

[0078] In other manners, the cover plate 52 can also be a curved cover plate. The edge part of the cover plate 52 is curved towards the side of the display panel 51, thereby realizing the narrow frame or even the full-screen design without frame. This manner can also make the static electricity 54 conduct to the frame area away from the display area, so as to be away from the display panel 51, thereby effectively avoiding the adverse effect of the static electricity on the display effect.

[0079] In other implementation manners, the side of the display panel 51 away from the display surface has a metal piece, and the static electricity protection layer of the cover plate 52 is connected with the metal piece to form a static electricity release path, thereby avoiding the accumulation of the static electricity 54 at the edge of the cover plate 52.

[0080] In the embodiments of the present application, the cover plate 52 can be fixed by optical glue and the display panel 51. If the display panel 51 is an OLED display panel, in order to reduce the reflection of ambient light, a polarizer can also be arranged on the display side of the display panel. The cover plate 52 is fixed on the side of the polarizer away from the display panel 51. The display panel 51 has a back support structure on the side away from the display surface. In the direction of the cover plate 52 pointing to the display panel 51, the back support structure includes a plurality of functional layers stacked in sequence. In this direction, the back support structure at least includes a plurality of functional layers stacked in sequence, including a dummy tape, a foam and a metal layer. The metal layer can be a Cu layer. At this time, the film layer structure of the display device can refer to the structure shown in Figure 1

[0081] In the present specification, each embodiment is described in a progressive, or parallel, or a combination of progressive and parallel manner. Each embodiment focuses on the difference from other embodiments, and the same or similar parts between each embodiment can be referred to each other. For the device disclosed in the embodiments, since it corresponds to the method disclosed in the embodiments, the description is relatively simple, and the related parts can be referred to the method part.

[0082] It should be noted that in the description of the present application, it should be understood that the description of the drawings and the embodiments is illustrative rather than limiting. Throughout the specification, the same reference signs identify the same structure. In addition, for the purpose of understanding and ease of description, the drawings may exaggerate the thickness of some layers, films, panels, regions, etc. It should be understood that when an element such as a layer, film, region or substrate is referred to as "on" another element, the element can be directly on the other element or there can be an intermediate element. In addition, "on" means positioning an element on another element or below another element, but not essentially positioning on the upper side of another element according to the direction of gravity.

[0083] The terms "upper", "lower", "top", "bottom", "inner", "outer" and the like indicate the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the indicated device or element must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation on the present application. When a component is considered to be "connected" to another component, it can be directly connected to the other component or there can be a component disposed therebetween.

[0084] ​It is also noted that the relational terms herein, such as first and second, and the like, are used solely to distinguish one from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Moreover, the terms "comprises", "comprising", or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a vesicle or apparatus that comprises a list of elements does not include only those elements but can also include other elements not expressly listed or inherent to such vesicle or apparatus. An element proceeded by "comprises a... " does not, without more constraints, preclude the existence of additional identical elements in the vesicle or apparatus that comprises the recited element.

[0085] The previous description of the disclosed embodiments is provided to enable any person skilled in the art to make or use the application. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein can be applied to other embodiments without departing from the spirit or scope of the application. Thus, the present application is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A cover plate for a display panel, characterized by The cover plate comprises: a transparent substrate having opposite first and second surfaces, the second surface being used to face a display surface of the display panel; an electrostatic discharge layer located at the first surface, the electrostatic discharge layer having an impedance in a first direction smaller than an impedance in a second direction; wherein the first direction is parallel to the first surface, and the second direction is perpendicular to the first surface; the electrostatic discharge layer comprises: a conductive mesh arranged at the first surface, the conductive mesh having a plurality of mesh units; and conductive microparticles located within the mesh units; the conductive microparticles are dispersed in the mesh units in a non-static state, and the conductive microparticles are gathered in the mesh units based on electrostatic force in a static state. Alternatively, the electrostatic discharge layer comprises: a metal mesh layer and an anisotropic conductive adhesive layer stacked in the second direction.

2. The cover sheet of claim 1, wherein The conductive mesh comprises a graphene film.

3. The cover sheet of claim 2, wherein, The thickness of the graphene film is 10-20 nm.

4. The cover sheet of claim 1, wherein The conductive microparticles are metal microparticles with a particle size of no more than 10 nm.

5. The cover sheet of claim 1, wherein The metal mesh layer is located at the first surface, and the anisotropic conductive adhesive layer is located at a side of the metal mesh layer away from the first surface and fills the mesh structure of the metal mesh layer.

6. The cover sheet of claim 1, wherein The anisotropic conductive adhesive layer is located at the first surface, and the metal mesh layer is located at a side of the anisotropic conductive adhesive layer away from the first surface.

7. The cover sheet according to any one of claims 1 to 6, characterized in that Further comprising: an insulating protective layer located at a side of the electrostatic discharge layer away from the first surface.

8. A display device, characterized by comprising: Comprise: a display panel; the cover plate according to any one of claims 1-7; the cover plate is arranged at a display surface of the display panel.

9. The display device according to claim 8, wherein A side of the display panel away from the display surface has a metal piece, and an electrostatic protective layer of the cover plate is connected with the metal piece.

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