Display module and display device

Abstract

The invention provides a display module and a display device. The display module comprises a display panel and a cover plate, the cover plate is arranged on one side of the display panel, and materials of the cover plate comprise polyurethane resin and a hydrophobic agent. By improving the performance of the related film layer in the display module, the wear resistance of the display module is improved, and the user experience is further improved.

Description

Technical Field

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

[0002] With the continuous advancement of display technology, AMOLED (Active Matrix Organic Light Emitting-Diode) display modules have gradually become the mainstream of display technology. AMOLED display modules are thin and light, bendable, and can achieve flexible display, thus bringing people a new product experience.

[0003] However, with the continuous innovation and transformation of the display form of smart electronic products, improving the overall performance of flexible folding display modules is still a major barrier. Summary of the invention

[0004] The purpose of the present invention is to provide a display module and a display device to improve the wear resistance of the existing flexible folding display module.

[0005] To achieve the above object, the present invention adopts the following technical solution:

[0006] A display module comprises a display panel and a cover plate, wherein the cover plate is arranged on one side of the display panel and the material of the cover plate comprises a polyurethane resin and a hydrophobic agent.

[0007] Further, the polyurethane resin includes polyurethane acrylate. The hydrophobic agent includes fluorinated silane. Preferably, the material of the cover plate also includes nano inorganic particles. Preferably, the nano inorganic particles include at least one of silicon oxide and metal oxide.

[0008] The display module further comprises a first adhesive layer. The first adhesive layer is disposed between the display panel and the cover plate. Preferably, the thickness of the first adhesive layer is less than or equal to 25 micrometers. Preferably, the material of the first adhesive layer comprises optical glue.

[0009] Furthermore, the display module also includes a color filter, and the color filter is arranged between the display panel and the cover plate.

[0010] Further, the storage modulus of the first adhesive layer is greater than 20 kPa. Preferably, the storage modulus of the first adhesive layer is greater than 20 kPa when the temperature is greater than 60°C. Preferably, the storage modulus of the first adhesive layer is greater than 35 kPa when the temperature is less than 60°C.

[0011] Further, the display module further comprises a second adhesive layer, and the second adhesive layer is arranged on a side of the display panel away from the cover plate. Preferably, the second adhesive layer comprises a substrate layer, a first adhesive layer and a second adhesive layer. The material of the substrate layer comprises polyimide. The first adhesive layer is arranged on one side of the substrate layer. The second adhesive layer is arranged on a side of the substrate layer away from the first adhesive layer. Preferably, the materials of the first adhesive layer and the second adhesive layer comprise optical adhesive.

[0012] Furthermore, the display module further comprises a support plate, and the support plate is arranged on a side of the second adhesive layer away from the cover plate. Preferably, the material of the support plate comprises a metal material. Preferably, the metal material comprises at least one of titanium or stainless steel.

[0013] Furthermore, the display module further comprises a support film, and the support film is arranged between the second adhesive layer and the display panel. Preferably, the display film group further comprises a third adhesive layer, and the third adhesive layer is arranged between the support film and the display panel. Preferably, the material of the third adhesive layer comprises a pressure-sensitive adhesive.

[0014] Furthermore, the display panel includes a display layer, an encapsulation layer and a touch layer. The encapsulation layer is arranged on a side of the display layer close to the cover plate. The touch layer is arranged on a side of the encapsulation layer away from the display layer.

[0015] The present invention further provides a display device, which includes the display module as described above.

[0016] The advantages of the present invention are: a display module and a display device of the present invention reduce the friction force generated by the film layer in the display module during the force friction process by improving the structure and material of the film layer in the display module, and improve the wear resistance of the display module, thereby improving the user experience. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings required for use in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative work.

[0018] Figure 1 is a schematic diagram of the three-dimensional structure of a display device in an embodiment of the present invention;

[0019] Figure 2 A schematic diagram of a layered structure of a display module in an embodiment of the present invention;

[0020] Figure 3is a schematic diagram of a layered structure of a display panel in an embodiment of the present invention;

[0021] Figure 4 is a schematic diagram of the layered structure of a color filter in an embodiment of the present invention;

[0022] Figure 5 Schematic diagram of the layered structure of the cover plate in an embodiment of the present invention;

[0023] Figure 6 Schematic diagram of the planar structure of the support plate in an embodiment of the present invention;

[0024] Figure 7 Schematic diagram of the layered structure of the second adhesive layer in an embodiment of the present invention.

[0025] The components in the figure are shown as follows:

[0026] Display device 1; Display module 100;

[0027] Display panel 10; Array substrate 11;

[0028] Light-emitting layer 12; Encapsulation layer 13;

[0029] Touch layer 14; Color filter 20;

[0030] Black matrix 21; Color block 22;

[0031] Cover plate 30; Support plate 40;

[0032] Hollow area 41; Hollow opening 42;

[0033] Support film 50; First adhesive layer 60;

[0034] Second adhesive layer 70; First adhesive layer 71;

[0035] Second adhesive layer 72; Base material layer 73;

[0036] The third adhesive layer 80 ; the frame body 200 . DETAILED DESCRIPTION

[0037] The preferred embodiments of the present invention are described below with reference to the drawings in the specification to prove that the present invention can be implemented. The embodiments of the invention can fully introduce the present invention to those skilled in the art, making its technical content clearer and easier to understand. The present invention can be embodied through many different forms of embodiments of the invention, and the protection scope of the present invention is not limited to the embodiments mentioned in the text.

[0038] In the drawings, components with the same structure are indicated by the same numerical reference numerals, and components with similar structures or functions are indicated by similar numerical reference numerals. The size and thickness of each component shown in the drawings are arbitrarily shown, and the present invention does not limit the size and thickness of each component. In order to make the illustration clearer, the thickness of the components is appropriately exaggerated in some places in the drawings.

[0039] In addition, the following descriptions of the various embodiments of the invention are made with reference to the attached diagrams to illustrate specific embodiments of the invention that the present invention can be implemented with. The directional terms mentioned in the present invention, such as "upper", "lower", "front", "back", "left", "right", "inner", "outer", "side", etc., are only with reference to the directions of the attached drawings. Therefore, the directional terms used are for better and clearer description and understanding of the present invention, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the present invention. In addition, the terms "first", "second", "third", etc. are used for descriptive purposes only and cannot be understood as indicating or implying relative importance.

[0040] When some components are described as being "on" another component, the component may be directly placed on the other component; there may also be an intermediate component on which the component is placed, and the intermediate component is placed on the other component. When a component is described as being "mounted on" or "connected to" another component, the two may be understood to be directly "mounted on" or "connected", or one component may be indirectly "mounted on" or "connected to" another component via an intermediate component.

[0041] In related display technologies, there are multiple functional film layers in the folding display module, but as the thickness of the display module increases, its wear resistance will also decrease significantly. In addition, the inventors also found that the adhesive layer used to bond adjacent film layers will increase the deformation of the display module after being stressed, causing the surface of the display module to have a large deformation (such as dents, etc.) in the direction of the force, which will also affect the wear resistance of the display module. The reduction in the wear resistance of the display module will directly affect the use of the product, causing the surface structure of the display module to be easily damaged, thereby affecting the service life of the folding display product and the user's experience of the folding display product.

[0042] Based on the technical problems in the above-mentioned related display technologies, a display device 1 is provided in an embodiment of the present invention. Figure 1 As shown in , the display device 1 is a foldable display device 1, which can realize foldable display, and can be any display device with a display function, such as a mobile phone, a tablet computer, etc. The display device 1 includes a frame 200 and a display module 100, wherein the frame 200 is used to carry the form module, and the display module 100 is used to provide a display screen for the display device 1.

[0043] like Figure 2 As shown, the display module 100 includes a display panel 10 , a cover plate 30 , a color filter 20 and a support plate 40 .

[0044] like Figure 3 As shown in , the display panel 10 includes a display layer and an encapsulation layer 13 which are stacked, and the display layer includes an array substrate 11 and a light-emitting layer 12 which are stacked, and the encapsulation layer 13 is arranged on a side of the light-emitting layer 12 away from the array substrate 11. The array substrate 11 is provided with a plurality of thin film transistors and signal wirings, and the signal wirings electrically connect the corresponding thin film transistors to form a pixel circuit. The pixel circuit can be divided into pixel circuits of various specifications such as "2T1C", "5T1C", "7T1C", "8T2C" according to the number of thin film transistors and capacitors electrically connected, and the pixel circuit of the corresponding specification can be selected according to the actual display requirements of the display panel 10. The light-emitting layer 12 is arranged on one side of the array substrate 11, and is provided with a plurality of light-emitting devices, each of which is electrically connected to a corresponding thin film transistor, thereby being electrically connected to a corresponding pixel circuit, and lighting up the corresponding light-emitting device through the pixel circuit, thereby realizing the display of an image. Specifically, the light-emitting layer 12 is provided with a plurality of light-emitting devices that can emit different colors, such as a red light-emitting device, a green light-emitting device, a blue light-emitting device, etc., and the display of a color image can be realized by evenly arranging a plurality of light-emitting devices of different colors. The encapsulation layer 13 covers the surface of the light-emitting layer 12 away from the array substrate 11, and is used to encapsulate and protect the light-emitting devices in the light-emitting layer 12 to prevent water vapor from invading and corroding the devices in the light-emitting layer 12 and the array substrate 11. The materials of the encapsulation layer 13 include organic materials and inorganic materials, which can be prepared by TFE (Thin Film Encapsulation) process.

[0045] Furthermore, the display panel 10 further includes a touch layer 14 disposed on a side of the encapsulation layer 13 away from the array substrate 11. The touch layer 14 is provided with a plurality of touch lines for sensing and transmitting touch signals, thereby realizing touch control of the terminal device and improving the user experience. The touch layer 14 can integrate the touch circuit on the surface of the display panel 10 through the TOE (Touch-Panel On Encapsulation) process, thereby reducing the thickness of the display panel 10 and the difficulty of bending.

[0046] like Figure 2As shown in , the color filter 20 is arranged on the side of the touch layer 14 away from the array substrate 11. The color filter 20 can be integrated on the light-emitting side of the display panel 10 (i.e., the side of the light-emitting layer 12 away from the array substrate 11) through the COE (Color-Filter On Encapsulation) process, thereby replacing the polarizer to filter the light emitted by the display panel 10, thereby reducing ambient light reflection and glare, significantly reducing the thickness of the display module 100 and improving the display brightness. At the same time, since more adhesive layers are used in the polarizer to bond the relevant optical film, the use of more adhesive layers will increase the deformation of the display module 100 after being subjected to force, thereby affecting the wear resistance of the display module 100. Therefore, in the embodiment of the present invention, by using the color filter 20, the number of adhesive layers in the display module 100 can be reduced, thereby improving the wear resistance of the display module 100. Specifically, as Figure 4 As shown in , the color filter 20 includes a black matrix 21 and a plurality of color resist blocks 22. The black matrix 21 is disposed on the touch layer 14 and has a plurality of openings. The openings are disposed corresponding to the light-emitting devices, and a color resist block 22 is disposed in each opening. The plurality of color resist blocks 22 include a plurality of color resist blocks 22 of different colors. A color resist block 22 of the same color is disposed in the opening corresponding to each light-emitting device, that is, a red color resist block 22 is disposed in the opening of the black matrix 21 corresponding to the red light-emitting device, a green color resist block 22 is disposed in the opening of the black matrix 21 corresponding to the green light-emitting device, and a blue color resist block 22 is disposed in the opening of the black matrix 21 corresponding to the blue light-emitting device. The light emitted by the light-emitting device itself and the external ambient light reflected by it can be filtered by the color block 22 and the black matrix 21, wherein: the black matrix 21 can efficiently absorb the full wavelength of ambient light, reduce large-angle oblique light, and prevent the light emitted by adjacent light-emitting devices from generating crosstalk; the color blocks 22 of different colors can further purify the light emitted by the light-emitting device into light of corresponding color wavelengths, and can also effectively absorb other wavelengths of light of non-corresponding colors in the ambient light; at the same time, the loss of the black matrix 21 and the color block 22 to the outgoing light is much lower than that of the polarizer, so the display brightness can be improved while improving the contrast of the display screen. Furthermore, the materials of the black matrix 21 and the color block 22 include insulating materials, for example: the black matrix 21 includes black organic materials, and the color blocks 22 of different colors include organic materials of corresponding colors.

[0047] like Figure 2 As shown in FIG. 1 , the cover plate 30 is disposed on the side of the color filter 20 away from the display panel 10 , and is used to protect the surface of the display module 100 and provide the surface of the display module 100 with wear and scratch resistance. Figure 5As shown in , the cover plate 30 includes a base layer 31 and a hardening coating 32, and the hardening coating 32 covers the surface of the base layer 31 away from the display panel 10. The material of the base layer 31 includes one of CPI (Colorless Polyimide, transparent polyimide), PET (Polyethylene Terephthalate, thermoplastic polyester) and UTG (Ultra-Thin Glass). The main material of the hardening coating 31 is a transparent resin, which can be a polyurethane resin with high wear resistance, high adhesion, high flexibility and excellent low temperature resistance, thereby improving the wear resistance of the cover plate 30. The polyurethane resin preferably uses polyurethane acrylate with high functionality and excellent wear resistance. At the same time, the material of the hardening coating 31 also includes nano-inorganic particles and hydrophobic agents. Adding nano-inorganic particles can make the transparent resin film layer have higher surface hardness and friction resistance, and adding a hydrophobic agent can reduce the surface energy of the transparent resin film layer, increase the water drop angle and reduce the dynamic friction coefficient. Preferably, the nano inorganic particles can be selected from silicon oxide and metal oxide, such as silicon dioxide or aluminum oxide, and the hydrophobic agent can be selected from fluorinated silane. The cover plate 30 provided in the embodiment of the present invention improves its material so that the number of friction resistance of its surface can reach 6000 times and above, thereby greatly improving the wear resistance of the cover plate 30, and further greatly improving the wear resistance of the surface of the display module 100.

[0048] like Figure 2As shown in the figure, the cover plate 30 can be attached to the surface of the color filter 20 away from the substrate through a first adhesive layer 60, and the material of the first adhesive layer 60 includes an organic material, such as an OCA optical adhesive. The first adhesive layer 60 is a thinned adhesive material with a thickness less than or equal to 25 microns, for example: the thickness of the first adhesive layer 60 can be one of 10 microns, 15 microns or 20 microns. In the embodiment of the present invention, the deformation of the first adhesive layer 60 after being subjected to force can be reduced by thinning the thickness of the first adhesive layer 60, thereby reducing the influence of the deformation of the first adhesive layer 60 on the surface flatness of the display module 100, thereby reducing the deformation of the display module 100 as a whole after being subjected to force, and reducing the influence of the surface deformation of the display module 100 on its wear resistance. The storage modulus of the first adhesive layer 60 is greater than 20 kPa. Preferably, the storage modulus of the first adhesive layer 60 in a high temperature environment (temperature greater than 60°C) is greater than 20 kPa, and the storage modulus of the first adhesive layer 60 in a normal temperature environment (temperature less than 60°C) is greater than 35 kPa. For example, the storage modulus of the first adhesive layer 60 in a high temperature environment (temperature greater than 60°C) can be 25 kPa, 30 kPa or 40 kPa, and the storage modulus of the first adhesive layer 60 in a normal temperature environment (temperature less than 60°C) can be 40 kPa, 50 kPa or 60 kPa, so that it is not affected by the ambient temperature and fails, and at the same time, the first adhesive layer 60 is not easily deformed after being subjected to force. When the display module 100 is subjected to external forces such as squeezing, the deformation of the first adhesive layer 60 is reduced, and the deformation of the display module 100 as a whole can also be reduced, thereby improving the surface flatness of the display module 100 after being subjected to force, and reducing the resistance of the deformation of the display module 100 (such as pressing depression, etc.) to the friction movement parallel to the module surface, which is also beneficial to improving the wear resistance of the display module 100 and improving the stability of the overall structure of the display module 100.

[0049] The support plate 40 is disposed on the side of the display panel 10 away from the cover plate 30. It is a rigid substrate and is used to provide rigid support for the entire display module 100. The material of the support plate 40 can be a metal material, such as titanium or stainless steel (SUS). Figure 6 As shown in the figure, the support plate 40 has a hollow area 41, which corresponds to the bending area of ​​the display module 100. When the bending area of ​​the display module 100 is bent, the hollow area 41 of the support plate 40 is also bent. A plurality of hollow openings 42 are provided in the hollow area 41, and the hollow openings 42 improve the flexibility of the support plate 40 in the hollow area 41, and at the same time, the metal fatigue of the support plate 40 can be reduced, thereby improving the service life of the support plate 40.

[0050] The support plate 40 can be attached to the surface of the display panel 10 away from the cover plate 30 through a second adhesive layer 70, such as Figure 7As shown in , the second adhesive layer 70 is a double-sided adhesive structure, and the second adhesive layer 70 of the double-sided adhesive structure includes a first adhesive layer 71, a substrate layer 73 and a second adhesive layer 72. The support plate 40 is attached to the surface of the first adhesive layer 71 away from the second adhesive layer 72, and the display panel 10 is located on the side of the second adhesive layer 72 away from the first adhesive layer 71. In another embodiment of the present invention, the support plate 40 can also be attached to the surface of the second adhesive layer 72 away from the first adhesive layer 71, and the display panel 10 is located on the side of the first adhesive layer 71 away from the second adhesive layer 72. Among them, the material of the substrate layer 73 includes polyimide, and the materials of the first adhesive layer 71 and the second adhesive layer 72 both include OCA optical adhesive. In related display technologies, a single-layer tape is usually used as the adhesive layer of the support plate 40. However, the deformation of the single-layer tape will increase after the display module 100 is squeezed, which will also lead to an increase in the overall deformation of the module. The deformation of the module surface will block the friction movement parallel to the module surface, which is not conducive to improving the wear resistance of the module surface. The double-sided tape structure used in the embodiment of the present invention can support the first adhesive layer 71 and the second adhesive layer 72 through the flexible substrate layer 73, thereby preventing the first adhesive layer 71 and the second adhesive layer 72 from being excessively deformed after being squeezed, preventing the display module 100 from being excessively deformed after being subjected to force, improving the surface flatness of the display module 100 after being squeezed, and thereby improving the wear resistance of the display module 100.

[0051] Furthermore, the first glue layer 71 and the second glue layer 72 can be made of the same material as that used in the first adhesive layer 60, so that the storage modulus of the first glue layer 71 and the second glue layer 72 is also greater than 20 kPa, wherein the storage modulus of the first glue layer 71 and the second glue layer 72 in a high temperature environment (temperature greater than 60°C) is greater than 20 kPa, and the storage modulus of the first glue layer 71 and the second glue layer 72 in a normal temperature environment (temperature less than 60°C) is greater than 35 kPa, which can further reduce the deformation of the first glue layer 71 and the second glue layer 72 after being subjected to force, thereby further improving the wear resistance of the display module 100.

[0052] like Figure 2 As shown in the figure, the display module 100 also includes a support film 50 (Barrier Protection Film, BPF), which is arranged between the display panel 10 and the support plate 40, and can be attached to the surface of the display panel 10 away from the cover plate 30 through a third adhesive layer 80, that is, the support plate 40 can be attached to the side of the support film 50 away from the display panel 10 through the second adhesive layer 70. Among them, the material of the third adhesive layer 80 includes pressure sensitive adhesive (Pressure Sensitive Adhesives, PSA). The support film 50 can support and protect the flexible substrate (such as a polyimide substrate layer) in the display panel 10 to prevent the flexible substrate in the display panel 10 from being eroded by water vapor.

[0053] In an embodiment of the present invention, the wear resistance of the cover plate is increased by improving the material in the cover plate, and a high modulus adhesive layer is used to reduce the deformation of the adhesive layer after being squeezed, thereby reducing the influence of the deformation of the adhesive layer on the overall deformation of the display module, and improving the surface flatness of the display module after being stressed, thereby further improving the wear resistance of the display module. At the same time, a color filter is also used in the embodiment of the present invention to avoid the use of a polarizer, thereby avoiding the introduction of an adhesive layer in the polarizer, reducing the overall thickness of the display module, and removing the influence of the adhesive layer in the polarizer on the deformation of the display module under stress. In summary, the display module provided in the embodiment of the present invention improves the performance of the film layer in its laminated structure, thereby increasing the number of surface wear resistance from less than or equal to 300 times to greater than or equal to 2500 times, greatly improving the overall wear resistance of the display module in the embodiment of the present invention, thereby also improving the competitiveness of the display module in the embodiment of the present invention and improving the customer experience.

[0054] Although the present invention is described herein with reference to specific embodiments, it should be understood that these embodiments are merely examples of the principles and applications of the present invention. It should therefore be understood that many modifications may be made to the exemplary embodiments and that other arrangements may be devised without departing from the spirit and scope of the present invention as defined by the appended claims. It should be understood that the various dependent claims and features described herein may be combined in a manner different from that described in the original claims. It should also be understood that features described in conjunction with individual embodiments may be used in other described embodiments.

Claims

1. A display module, characterized in that: include: Display panel; A cover plate, disposed on one side of the display panel; The material of the cover plate includes polyurethane resin and a hydrophobic agent.

2. The display module according to claim 1, wherein: The polyurethane resin includes polyurethane acrylate; The hydrophobic agent includes fluorinated silane; Preferably, the material of the cover plate further comprises nano inorganic particles; Preferably, the nano inorganic particles include at least one of silicon oxide and metal oxide.

3. The display module according to claim 1, wherein: Also includes: A first adhesive layer is provided between the display panel and the cover plate; Preferably, the thickness of the first adhesive layer is less than or equal to 25 microns; Preferably, the material of the first adhesive layer includes optical glue.

4. The display module according to claim 1, wherein: Also includes: The color filter is arranged between the display panel and the cover plate.

5. The display module according to claim 1, wherein: Also includes: A second adhesive layer is provided on a side of the display panel facing away from the cover plate; Preferably, the second adhesive layer comprises: A substrate layer, wherein the material of the substrate layer comprises polyimide; A first adhesive layer, disposed on one side of the substrate layer; A second adhesive layer is disposed on a side of the substrate layer away from the first adhesive layer; Preferably, the material of the first adhesive layer and the second adhesive layer includes optical adhesive.

6. The display module according to claim 3, characterized in that: The storage modulus of the first adhesive layer is greater than 20 kPa; Preferably, the storage modulus of the first adhesive layer is greater than 20 kPa when the temperature is greater than 60° C.; preferably, the storage modulus of the first adhesive layer is greater than 35 kPa when the temperature is less than 60° C.

7. The display module according to claim 5, characterized in that: Also includes: A support plate, disposed on a side of the second adhesive layer facing away from the cover plate; Preferably, the material of the support plate includes metal material; Preferably, the metal material includes at least one of titanium or stainless steel.

8. The display module according to claim 5, wherein: Also includes: A supporting film, disposed between the second adhesive layer and the display panel; Preferably, the display film set further comprises a third adhesive layer, and the third adhesive layer is provided between the support film and the display panel; Preferably, the material of the third adhesive layer includes pressure-sensitive adhesive.

9. The display module according to claim 1, wherein: The display panel comprises: Display layer; An encapsulation layer, disposed on a side of the display layer close to the cover plate; The touch layer is arranged on a side of the packaging layer away from the display layer.

10. A display device, characterized in that: Comprising a display module as described in any one of claims 1-9.

Images