Cover plate and manufacturing method and display panel

Abstract

The application provides a cover plate, a preparation method and a display panel, and relates to the technical field of display. The cover plate is used for covering a display substrate and comprises a first sub-organic cover plate, a second sub-organic cover plate, a polarizing sub-layer and a phase difference compensation layer. The second sub-organic cover plate is located on the side of the first sub-organic cover plate facing the display substrate. The polarizing sub-layer is located between the first sub-organic cover plate and the second sub-organic cover plate. The phase difference compensation layer is located between the polarizing sub-layer and the second sub-organic cover plate. The problem that the thickness of the cover plate is relatively large after the cover plate is attached to the polarizer is solved.

Description

Technical Field

[0001] This application relates to the field of display technology, specifically to a cover plate, its preparation method, and a display panel. Background Technology

[0002] Existing display panels, such as conventional IML (In-Mold Injection Molding) display panels, mainly consist of an IML cover plate, a polarizer, and a display substrate. The IML cover plate and the polarizer are usually bonded together with an adhesive, which often results in both being relatively thick, hindering the achievement of a thinner display panel. Summary of the Invention

[0003] A first aspect of this application provides a cover plate for covering a display substrate, comprising a first sub-organic cover plate, a second sub-organic cover plate, a polarizing layer, and a phase difference compensation layer. The second sub-organic cover plate is located on the side of the first sub-organic cover plate facing the display substrate. The polarizing layer is located between the first and second sub-organic cover plates. The phase difference compensation layer is located between the polarizing layer and the second sub-organic cover plate.

[0004] In the above scheme, by placing the polarizing sub-layer and the phase difference compensation layer between the two sub-organic cover plates, a composite cover plate structure with polarization function is formed. Compared with the existing combination of cover plate and polarizer, the thickness of the improved cover plate is reduced, which is conducive to realizing the thinning of the display panel using the cover plate.

[0005] In conjunction with the first aspect, in some embodiments, the hardness of the first sub-organic cover plate is greater than the hardness of the second organic cover plate.

[0006] In the above scheme, the first sub-organic cover plate with greater hardness improves the connection strength between the polarizer layer and the first sub-organic cover plate, and also improves the overall performance of the cover plate.

[0007] In conjunction with the first aspect, in some embodiments, the ink layer is located between the polarizer layer and the phase difference compensation layer, or the ink layer is located on the side of the phase difference compensation layer facing the second sub-organic cover plate.

[0008] In the above scheme, the ink layer can be set in different positions according to the needs of the cover plate, which not only increases the applicability of the cover plate, but also eliminates the need to design other film layers such as optical adhesive layers to deal with the "discontinuity" generated by the ink layer, simplifying the cover plate process and saving production costs.

[0009] In conjunction with the first aspect, in some embodiments, the display substrate includes a display area and a non-display area, the non-display area being disposed around the display area, and the display area including a plurality of sub-pixels, wherein the orthographic projection of the ink layer on the display substrate is located within the non-display area.

[0010] In conjunction with the first aspect, in some embodiments, the display substrate includes a display area and a non-display area, the non-display area surrounding the display area, and the display area including a plurality of sub-pixels. The ink layer includes a first portion located within the non-display area and a second portion located within the display area. The second portion is arranged in an array, and the orthographic projection of the second portion onto the first sub-organic cover plate is located outside the orthographic projection of the sub-pixels onto the first sub-organic cover plate.

[0011] In the above scheme, the ink layer presents a matrix design in the display area of ​​the corresponding display panel, which improves the display effect of the display panel using the cover plate.

[0012] In conjunction with the first aspect, in some embodiments, when the orthogonal projection of the ink layer on the display substrate is located within a non-display area, the orthogonal projection of the ink layer on the first sub-organic cover plate overlaps with the orthogonal projection of the polarizing layer or phase compensation layer on the first sub-organic cover plate. Alternatively, the orthogonal projection of the ink layer on the first sub-organic cover plate falls within the orthogonal projection of the polarizing layer or phase compensation layer on the first sub-organic cover plate.

[0013] In the above scheme, based on the functional requirements of the cover plate and the production conditions, the size of the polarizer layer or phase difference compensation layer relative to the ink layer can be selected, which improves the applicability of the cover plate.

[0014] In conjunction with the first aspect, in some embodiments, the cover plate further includes a first adhesive layer located between the first sub-organic cover plate and the polarizer layer. Further, the first adhesive layer is a pressure-sensitive adhesive layer.

[0015] In the above scheme, the design of the first adhesive layer improves the bonding strength between the first sub-organic cover plate and the polarizer.

[0016] In conjunction with the first aspect, in some embodiments, the cover plate further includes a protective layer and a second adhesive layer. The protective layer is located between the polarizer layer and the phase difference compensation layer. The second adhesive layer is located between the protective layer and the phase difference compensation layer. Further, the protective layer is a cellulose triacetate (TAC) film layer. Further, the second adhesive layer is a pressure-sensitive adhesive layer.

[0017] In the above scheme, the protective layer placed between the polarizer layer and the phase difference compensation layer improves the lifespan of the cover plate, and the second adhesive layer increases the bonding strength between the protective layer and the phase difference compensation layer, thereby further improving the lifespan of the cover plate. In addition, the second adhesive layer can also fill the "discontinuity" caused by the ink layer, achieving the effect of a single film layer serving multiple purposes, thus simplifying the structure of the cover plate.

[0018] In conjunction with the first aspect, in some embodiments, the cover plate further includes a third adhesive layer located on one side of the second sub-organic cover plate away from the phase difference compensation layer. Further, the third adhesive layer is a pressure-sensitive adhesive layer.

[0019] In the above scheme, the third adhesive layer facilitates the use of the cover plate and improves its ease of use.

[0020] In conjunction with the first aspect, in some embodiments, the cover plate also includes a release film located on the side of the third adhesive layer opposite to the second sub-organic cover plate.

[0021] In the above scheme, the release film protects the third adhesive layer and prevents dust from adhering to the second adhesive layer and affecting its adhesion.

[0022] A second aspect of this application provides a method for fabricating a cover plate, the cover plate being disposed on the light-emitting side of a display substrate. The method includes forming a first sub-organic cover plate; forming a polarizer layer on the side of the first sub-organic cover plate facing the display panel; forming a phase difference compensation layer on the side of the polarizer layer facing away from the first sub-organic cover plate; and forming a second sub-organic cover plate on the side of the phase difference compensation layer facing away from the first sub-organic cover plate.

[0023] In conjunction with the second aspect, in some embodiments, the preparation method further includes forming an ink layer between the polarizer layer and the phase difference compensation layer. Alternatively, an ink layer is formed on the side of the phase difference compensation layer facing the second sub-organic cover plate.

[0024] In conjunction with the second aspect, in some embodiments, the preparation method further includes forming a first adhesive layer between the first sub-organic cover plate and the polarizing layer. A protective layer is formed on the side of the polarizing layer opposite to the first sub-organic cover plate. A second adhesive layer is formed on the side of the protective layer opposite to the first sub-organic cover plate.

[0025] A third aspect of this application provides a display panel, which includes a display substrate and a cover plate. The cover plate is disposed on the display substrate and located on the light-emitting side of the display substrate, and is the cover plate of any one of the first aspects described above. Attached Figure Description

[0026] Figure 1 This is a schematic diagram of the cover plate in one embodiment of this application.

[0027] Figure 2 This is a schematic diagram of the cover plate in another embodiment of this application.

[0028] Figure 3 This is a schematic diagram of the cover plate in another embodiment of this application.

[0029] Figure 4 This is a schematic diagram of the structure of a cover plate applied to a display substrate in one embodiment of this application.

[0030] Figure 5 This is a schematic diagram of the cover plate applied to the display substrate in another embodiment of this application.

[0031] Figure 6 This is a schematic diagram of the cover plate in one embodiment of this application.

[0032] Figure 7 This is a flowchart of a method for preparing a cover plate according to one embodiment of this application.

[0033] Figure 8 This is a flowchart of a method for preparing a cover plate according to one embodiment of this application.

[0034] Figure 9 This is a flowchart of a method for preparing a cover plate according to another embodiment of this application. Detailed Implementation

[0035] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments in this application, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of the present invention.

[0036] Polarizers include linear polarizers and circular polarizers. Linear polarizers convert natural light into linearly polarized light and are mainly used in liquid crystal displays (LCDs). Circular polarizers (C-POLs) are key components of OLED (Organic Light-Emitting Diode) flexible displays. Their main function is to reduce or even eliminate reflected light from the electrodes of OLED flexible displays, thereby improving the display effect and contrast.

[0037] In a conventional design, a polarizer consists of a series of layers stacked sequentially: HC-TAC (Hard coating-Triacetate Cellulose), PVA (polarizer), TAC (Triacetate Cellulose), PSA (pressure-sensitive adhesive), ND-film (phase compensation), and another PSA layer. The HC layer is coated on the side of the TAC layer facing away from the PSA layer to increase the surface hardness of the TAC and improve its scratch resistance, ultimately forming the HC-TAC layer. The PVA layer is a functional film that converts external light into linearly polarized light; it is typically made of polyvinyl alcohol, which is highly susceptible to hydrolysis. Therefore, a protective layer, such as a TAC layer, needs to be adhered to the PVA layer. The TAC layer not only improves the physical and mechanical properties of the PVA film but also acts as a barrier against external moisture. The ND-film layer is another functional film that enables the conversion between linearly polarized and circularly polarized light. The PSA layer, or pressure-sensitive adhesive layer, is used to connect the upper and lower composite materials. When a polarizer is applied to a display device, it is used to attach the polarizer to the light-emitting side of the display substrate.

[0038] The polarizer based on the above structure is prepared by the following steps.

[0039] Step S001: The HC-TAC layer and the TAC layer are respectively placed on the upper and lower sides of the PVA layer, and the three film layers are bonded together through stretching and composite processes.

[0040] Step S002: Coat the first PSA layer on the side of the TAC layer opposite to the PVA layer.

[0041] Step S003: Attach the ND-film layer onto the first PSA layer.

[0042] Step S004: Coat the second PSA layer on the side of the ND-film layer opposite to the first PSA layer.

[0043] Step S005: Adhere the release film onto the second PSA layer.

[0044] In a typical display panel, there is a display substrate, a polarizer, a cover plate, and an adhesive layer between the polarizer and the cover plate. The cover plate and the polarizer are bonded together by the adhesive layer. After they are bonded together, the film thickness is relatively large, which is not conducive to achieving a thinner display panel using both of them. In fact, the poor bonding effect between the two may even affect the quality of the display panel.

[0045] Based on this, this application provides a composite cover plate structure, which itself has the function of a polarizer, thus improving the problem that the film thickness is too large after the cover plate and the polarizer are bonded together, thereby affecting the thinness of the display panel.

[0046] This application provides a cover plate for covering a display substrate. Figure 1 As shown, the cover plate 100 includes a first sub-organic cover plate 101, a second sub-organic cover plate 102, a polarizing layer 103, and a phase difference compensation layer 104. The second sub-organic cover plate 102 is located on the side of the first sub-organic cover plate 101 facing the display substrate 200. The polarizing layer 103 is located between the first sub-organic cover plate 101 and the second sub-organic cover plate 102. The phase difference compensation layer 104 is located between the polarizing layer 103 and the second sub-organic cover plate 102. By disposing the polarizing layer 103 and the phase difference compensation layer 104 between the two sub-organic cover plates, a composite cover plate structure with polarization function is formed. Compared with the existing combination of cover plate and polarizer, the improved cover plate has a reduced film thickness, which is beneficial for achieving a thinner and lighter display panel using this cover plate.

[0047] Based on the functional requirements of the display panel, some areas need to be light-shielded. Therefore, in some embodiments, the cover plate also includes an ink layer located between the first sub-organic cover plate and the second sub-organic cover plate. Considering the structure of the cover plate, the ink layer is specifically configured as follows.

[0048] In some embodiments, the hardness of the first organic cover plate is greater than that of the second organic cover plate. The first organic cover plate is typically made of polyethylene terephthalate (PET) or polyimide (PI), while the second organic cover plate is typically made of PMMA particles, polycarbonate (PC) particles, or a mixture of both injection molded into particles. A polarizer layer is directly disposed on the relatively harder first organic cover plate, meaning the first organic cover plate acts as the HC-TAC film layer in the polarizer. The two are combined through stretching and lamination processes to form a composite structure, which improves the bonding strength between the film layers in the cover plate and increases the lifespan of the cover plate.

[0049] In at least one embodiment, such as Figure 2 As shown, the ink layer 105 is located between the polarizer layer 103 and the phase difference compensation layer 104. In this solution, not only is it not necessary to improve the processing technology of the ink layer 105, but the other film layers provided between the polarizer layer 103 and the phase difference compensation layer 104 can also eliminate the "discontinuity" caused by the provision of the ink layer 105. Therefore, there is no need to provide an additional film layer to treat the "discontinuity", which is more conducive to achieving a thinner and lighter cover plate 100.

[0050] In at least another embodiment, such as Figure 3As shown, the ink layer 105 is disposed on the side of the phase difference compensation layer 104 facing the second sub-organic cover plate 102. The second sub-organic cover plate 102 can directly fill the "discontinuity" caused by the ink layer 105, simplifying the structure of the cover plate 100 and making it easier to achieve a thinner and lighter cover plate 100.

[0051] It should be understood that the ink layer can be replaced by other light-shielding layers, and the ink layer can also be set in other positions on the cover plate. For example, the ink layer can be set on the side of the first sub-organic cover plate facing the second sub-organic cover plate or on the side of the second sub-organic cover plate away from the first sub-organic cover plate. These can be specifically designed according to the functional requirements of the cover plate of the display panel, and will not be elaborated here.

[0052] The ink layer can be placed in different positions according to the needs of the cover plate, which not only increases the applicability of the cover plate, but also eliminates the need for additional film layers such as optical adhesive layers to handle the "discontinuity" created by the ink layer, simplifying the cover plate process and saving production costs. In addition, the surface area of ​​the ink layer can be designed according to the functional requirements of the display substrate.

[0053] In some embodiments, such as Figure 4 As shown, the display substrate 200 includes a non-display area 201 and a display area 202. The non-display area 201 surrounds the display area 202, and the display area 202 includes a plurality of sub-pixels 203 that emit light of at least one color. Specifically, there are two sub-pixels 203. The orthographic projection of the ink layer 105 on the display substrate 200 is located within the non-display area 201. That is, the ink layer 105 in the cover plate 100 only provides light-shielding treatment for the edge area of ​​the display substrate 200, i.e., the non-display area 201, simplifying the process of the ink layer 105 and saving the production cost of the cover plate 100.

[0054] Based on the case where the orthogonal projection of the ink layer on the display substrate is located in the non-display area, in at least one embodiment, the orthogonal projection of the ink layer on the first sub-organic cover overlaps with the orthogonal projection of the polarizer layer or the phase difference compensation layer on the first sub-organic cover.

[0055] In at least another embodiment, the orthogonal projection of the ink layer on the first sub-organic cover falls within the orthogonal projection of the polarizer layer or the phase difference compensation layer on the first sub-organic cover.

[0056] When the ink layer is set at the outer edge of the cover plate, it corresponds to the non-display area of ​​the display substrate. Whether the ink layer overlaps or partially overlaps with other film layers, such as the polarizer layer or the phase difference compensation layer, or whether the ink layer falls entirely within this film layer, can be selected according to the production conditions and functional requirements of the cover plate, thereby increasing the adaptability of the cover plate.

[0057] In other embodiments, such as Figure 5 As shown, the display substrate 200 includes a non-display area 201 and a display area 202. The non-display area 201 surrounds the display area 202, and the display area 202 includes a plurality of sub-pixels 203 that emit light of at least one color. Specifically, the display area includes two sub-pixels. The ink layer 105 includes a first portion 105a located in the non-display area 201 and a second portion 105b located in the display area 202. The second portion 105b is arranged in an array, and the orthographic projection of the second portion 105b on the first sub-organic cover plate 101 is outside the orthographic projection of the sub-pixels 203 on the first sub-organic cover plate 101. The ink layer 105 presents a matrix design on the cover plate corresponding to the display area 202 of the display substrate 200, which reduces the impact of light reflection from the periphery of the sub-pixels 203 and other optical effects on the light emission effect of the display substrate, thereby improving the display effect of the display panel.

[0058] It should be understood that the number, arrangement, and type of emitted color light of the sub-pixels on the display substrate are not limited here; these can be specifically designed according to the functional requirements of the display substrate. When the ink layer is located in the non-display area corresponding to the display substrate or in the gap between the non-display area corresponding to the display substrate and the periphery of the sub-pixels, the ink layer can be located between any film layers included in the cover plate. For example, it can be located between the polarizer layer and the phase difference compensation layer, or between the first sub-organic cover plate and the polarizer layer, or between the phase difference compensation layer and the second sub-organic cover plate. These can be selected according to the functional requirements of the display substrate for the cover plate and the production conditions of the cover plate, and will not be elaborated here.

[0059] From the perspective of improving the lifespan of cover plates with polarizing effects, in some embodiments, such as Figure 6 As shown, the cover plate also includes a first adhesive layer 106 located between the first sub-organic cover plate 101 and the polarizer layer 103, used to improve the bonding strength between the first sub-organic cover plate 101 and the polarizer layer 103, thereby improving the lifespan of the cover plate. In at least one embodiment, the first adhesive layer 106 is a pressure-sensitive adhesive layer. Conventional cover plates and polarizers are connected by adhesives with a thickness of 0.1 mm to 0.15 mm. Here, the first sub-organic cover plate 101 is connected to the polarizer layer 103 through the first adhesive layer 106, and the thickness of the first adhesive layer 106 is less than 0.1 mm. Considering that the cover plate in this embodiment is manufactured by large-sheet lamination followed by cutting to obtain individual units, there is no problem of poor adhesion between the first sub-organic cover plate 101 and the polarizer layer 103 for the individual units.

[0060] From the perspective of improving the lifespan of cover plates with polarizing effects, in some embodiments, such as Figure 6As shown, the cover plate 100 further includes a protective layer 107 and a second adhesive layer 108. The protective layer 107 is located between the polarizer layer 103 and the phase difference compensation layer 104. The second adhesive layer 108 is located between the protective layer 107 and the phase difference compensation layer 104. The protective layer enhances the physical and mechanical properties of the polarizer layer 103 and the phase difference compensation layer 104, thereby improving the lifespan of the cover plate 100. Furthermore, the protective layer 107 is bonded to these two film layers via the adhesive layer, further increasing the bonding strength between the various film layers included in the cover plate 100, thereby further increasing the lifespan of the cover plate 100.

[0061] In at least one embodiment, the protective layer is a triacetate cellulose membrane, i.e., a TAC membrane. The TAC membrane not only increases the physical and mechanical properties of the membrane, but also has the function of isolating water vapor, thereby reducing the impact of external water vapor on the performance of the polarizer layer included in the cover plate, and thus further improving the lifespan of the cover plate.

[0062] In at least one embodiment, the first adhesive layer is a pressure-sensitive adhesive layer, which allows the first adhesive layer to increase the film strength between the cover plates without affecting the optical effect of the display substrate using the cover plate, thereby improving the overall performance of the cover plate.

[0063] Based on the specific film layers included between the polarizer layer and the phase difference compensation layer, in at least one embodiment, such as Figure 6 As shown, the ink layer 105 is disposed on the side of the protective layer 107 facing the second adhesive layer 108. The second adhesive layer 108 not only increases the connection strength between the protective layer 107 and the phase difference compensation layer 104, but also eliminates the "discontinuity" caused by the ink layer 105. The second adhesive layer 108 plays multiple roles, simplifying the structure of the cover plate 100. Therefore, the second adhesive layer 108 not only improves the lifespan of the cover plate 100, but also improves the thinness of the cover plate 100.

[0064] It should be understood that the arrangement of the ink layer between the polarizer layer and the phase difference compensation layer is not limited to the arrangement in the above embodiments. For example, the ink layer can be disposed between the polarizer layer and the protective layer or on the side of the phase difference compensation layer facing the first adhesive layer. These can be selected according to the actual production process, and will not be elaborated here.

[0065] Considering how to mount the cover plate on the display substrate, in some embodiments, such as Figure 6As shown, the cover plate 100 also includes a third adhesive layer 109, which is located on one side of the second sub-organic cover plate 102 away from the phase difference compensation layer 104. The third adhesive layer 109 facilitates the use of the cover plate 100 and improves its ease of use. In at least one embodiment, the third adhesive layer 109 is a pressure-sensitive adhesive layer, which, while enabling the cover plate 100 to connect with the display substrate 200, does not affect the photoelectric performance of the display substrate 200.

[0066] Based on the design of the second adhesive layer, in at least one embodiment, such as Figure 6 As shown, the cover plate 100 also includes a release film 110, which is disposed on the side of the third adhesive layer opposite to the first sub-organic cover plate 101. The release film 110 protects the third adhesive layer from dust accumulation, preventing it from affecting the bonding effect. When applying the cover plate 100 to the display substrate 200, the release film 110 can be removed.

[0067] This application also provides a method for preparing a cover plate, the cover plate being used to cover the light-emitting side of a display substrate, such as... Figure 7 , Figure 8 and Figure 9 As shown, the preparation method includes the following specific steps.

[0068] Step S01: Form the first sub-organic cover plate.

[0069] Step S02: A polarizing layer is formed on the side of the first organic cover plate facing the display panel.

[0070] Step S03: Form a phase difference compensation layer on the side of the polarizer layer opposite to the first sub-organic cover plate.

[0071] Step S04: A second sub-organic cover plate is formed on the side of the phase difference compensation layer away from the first sub-organic cover plate. The hardness of the second sub-organic cover plate is less than that of the first sub-organic cover plate.

[0072] The second organic cover plate is injection molded by placing the composite film layer prepared in steps S01, S02 and S03 into an injection mold, injecting the raw material of the second organic cover plate, and combining it with the composite film layer to form a cover plate structure with polarization function. Furthermore, the second organic cover plate is adhesive during the injection molding process, so there is no need to set an adhesive layer (such as an optical adhesive layer) on the side of the phase difference compensation layer that is away from the first organic cover plate, which simplifies the structure of the cover plate and thus helps to achieve a thinner and lighter cover plate.

[0073] To improve the quality of the cover plate, in some embodiments, the following step is included between step S01 and step S02:

[0074] Step S011: Form a first adhesive layer between the first sub-organic cover plate and the polarizing layer.

[0075] In some embodiments, between steps S02 and S03, the method further includes: step S021: forming a protective layer on the side of the polarizer layer facing away from the first organic cover plate. Specifically, the protective layer is a TAC layer, which is applied to the side of the polarizer layer facing away from the first organic cover plate through a coating and lamination process. The first organic cover plate and the TAC layer can be applied to the upper and lower sides of the polarizer layer in one step through a stretching and lamination process, that is, the first organic cover plate replaces the HC-TAC layer in the prior art.

[0076] Step S022: A second adhesive layer is formed on the side of the protective layer facing away from the first sub-organic cover plate. The second adhesive layer increases the connection strength between the protective layer and the phase difference compensation layer, thereby improving the quality of the cover plate.

[0077] Considering that the display substrate using this cover plate needs to have a light-shielding area, the preparation method of the cover plate also includes forming an ink layer, and the specific steps are as follows.

[0078] In some embodiments, such as Figure 8 As shown, after step S02 and before step S03, i.e. before forming the phase difference compensation layer, there is a step of forming an ink layer between the polarizer layer and the phase difference compensation layer.

[0079] Specifically, step S0211 involves forming an ink layer on the side of the protective layer away from the polarizer layer, which can be achieved by coating or inkjet printing.

[0080] Not limited to the above embodiments, other solutions can also be used to set the ink layer, such as... Figure 9 As shown, in some other embodiments, after step S03 and before step S04, i.e. before forming the second sub-organic cover, step S031 is included: setting an ink layer on the side of the phase difference compensation layer away from the first sub-organic cover.

[0081] In some embodiments, the preparation method further includes:

[0082] Step S05: A third adhesive layer is formed on the side of the second sub-organic cover plate away from the first sub-organic cover plate.

[0083] Step S06: Set a shaped membrane on the side of the third adhesive layer away from the first sub-organic cover plate.

[0084] This application embodiment also provides a display panel, which includes a display substrate and a cover plate. The cover plate is disposed on the display substrate and located on the light-emitting side of the display substrate, and is any of the cover plates described above.

[0085] In at least one embodiment, the display panel further includes a touch sensor, a touch chip, and a flexible circuit board for implementing touch control. To achieve a thinner and lighter touch display panel, the touch sensor is disposed in the encapsulation layer of the display panel, the touch chip is disposed on the flexible circuit board, and signals are transmitted to the touch sensor through touch signal lines.

[0086] In at least one embodiment, the display panel can be any product or component with display and touch functions, such as a mobile phone, tablet computer, television, monitor, laptop computer, digital photo frame, or navigator.

[0087] The above description is merely a specific embodiment of this application, but the scope of protection of this application is not limited thereto. Any variations or substitutions that can be conceived by those skilled in the art within the scope of the technology disclosed in this application should be included within the scope of protection of this application. Therefore, the scope of protection of this application should be determined by the scope of the claims.

Claims

1. A cover plate, the cover plate being disposed on a display substrate, characterized in that, The display substrate includes a display area and a non-display area, the non-display area surrounding the display area, and the display area including a plurality of sub-pixels, the sub-pixels being organic light-emitting diodes (OLEDs). The cover plate includes: The first organic cover plate includes polyethylene terephthalate material or polyimide material; The second sub-organic cover plate is located on the side of the first sub-organic cover plate facing the display substrate. The second sub-organic cover plate includes at least one of acrylate particles, polycarbonate particles, or particles formed by injection molding a mixture of acrylate particles and polycarbonate particles. The polarizer layer is located between the first sub-organic cover plate and the second sub-organic cover plate, and is directly disposed on the first sub-organic cover plate through a stretching and composite process; A first adhesive layer is located between the first sub-organic cover plate and the polarizing layer, and the thickness of the first adhesive layer is less than 0.1 mm; A phase difference compensation layer is located between the polarizer layer and the second sub-organic cover plate, wherein the polarizer layer and the phase difference compensation layer are used to form a polarizer, and the first sub-organic cover plate is reused as the HC-TAC film layer of the polarizer; and An ink layer comprising a first part and a second part, wherein the first part is located within the non-display area, and the second part is located within the display area and arranged in an array, and the orthographic projection of the second part on the first sub-organic cover plate is located outside the orthographic projection of the sub-pixel on the first sub-organic cover plate; Wherein, the hardness of the second sub-organic cover plate is less than that of the first sub-organic cover plate, the second sub-organic cover plate is an injection molded part, the phase difference compensation layer is injection molded to the second sub-organic cover plate, the ink layer is located between the polarizer layer and the phase difference compensation layer, or the ink layer is located on the side of the phase difference compensation layer facing the second sub-organic cover plate, and the step difference caused by the ink layer is canceled by the film layer adjacent to the ink layer.

2. The cover plate according to claim 1, characterized in that, When the orthographic projection of the ink layer on the display substrate is located within the non-display area. The orthographic projection of the ink layer on the first sub-organic cover plate overlaps with the orthographic projection of the polarizer layer or the phase difference compensation layer on the first sub-organic cover plate; or The orthographic projection of the ink layer on the first sub-organic cover plate falls within the orthographic projection of the polarizer layer or the phase difference compensation layer on the first sub-organic cover plate.

3. The cover plate according to claim 1, characterized in that, The first adhesive layer is a pressure-sensitive adhesive layer.

4. The cover plate according to claim 1, characterized in that, It also includes, A protective layer is located between the polarizer layer and the phase difference compensation layer; as well as A second adhesive layer is located between the protective layer and the phase difference compensation layer, and the thickness of the second adhesive layer is greater than or equal to the thickness of the first adhesive layer.

5. The cover plate according to claim 4, characterized in that, The protective layer is a cellulose triacetate membrane.

6. The cover plate according to claim 5, characterized in that, The second adhesive layer is a pressure-sensitive adhesive layer.

7. A method for preparing a cover plate, the cover plate being used to cover the light-emitting side of a display substrate, characterized in that, The display substrate includes a display area and a non-display area, the non-display area surrounding the display area, and the display area including a plurality of sub-pixels, the sub-pixels being organic light-emitting diodes (OLEDs). The method for fabricating the cover plate includes: A first organic cover plate is formed, wherein the first organic cover plate comprises polyethylene terephthalate material or polyimide material; A first adhesive layer is formed on the first sub-organic cover plate, wherein the thickness of the first adhesive layer is less than 0.1 mm; A polarizing layer is formed on the side of the first sub-organic cover plate facing the display substrate, wherein the polarizing layer is directly disposed on the first sub-organic cover plate through a stretching and composite process. A phase difference compensation layer and an ink layer are formed on the side of the polarizer layer opposite to the first sub-organic cover plate, wherein the polarizer layer and the phase difference compensation layer are used to form a polarizer, and the first sub-organic cover plate is reused as the HC-TAC film layer of the polarizer. The ink layer includes a first part and a second part. The first part is located in the non-display area, and the second part is located in the display area and arranged in an array. The orthographic projection of the second part on the first sub-organic cover plate is located outside the orthographic projection of the sub-pixel on the first sub-organic cover plate. A second sub-organic cover is formed on the side of the phase difference compensation layer opposite to the first sub-organic cover. The second sub-organic cover includes at least one of acrylate particles, polycarbonate particles, or particles formed by injection molding a mixture of acrylate particles and polycarbonate particles. The hardness of the second sub-organic cover is less than that of the first sub-organic cover. The second sub-organic cover is injection molded, and the phase difference compensation layer is injection molded together with the second sub-organic cover based on the adhesiveness of the second sub-organic cover during the injection molding process. The ink layer is located between the polarizer layer and the phase difference compensation layer, or the ink layer is located on the side of the phase difference compensation layer facing the second sub-organic cover plate, and the step difference caused by the ink layer is canceled out by the film layer adjacent to the ink layer.

8. The preparation method according to claim 7, characterized in that, It also includes, A protective layer is formed on the side of the polarizing layer opposite to the first sub-organic cover plate; A second adhesive layer is formed on the side of the protective layer opposite to the first sub-organic cover plate.

9. A display panel, characterized in that, include: Display substrate; as well as A cover plate is disposed on the display substrate and located on the light-emitting side of the display substrate, and is the cover plate according to any one of claims 1-6.

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