Display module, preparation method thereof, and display device

Abstract

The present application provides a display module and a preparation method thereof, and a display device, wherein the display module comprises: a display panel; a support structure, wherein the support structure is arranged on one side of the display panel, and the side of the display panel facing away from the support structure is a light-emitting side, wherein the material of the support structure comprises metal, and the content of free electrons on the surface of the side of the support structure facing the display panel is less than the content of free electrons on the surface of the side of the support structure facing away from the display panel. With such an arrangement, the content of free electrons on the surface of the side of the support structure facing the display panel is less, so that the reflected light reflected to the display panel after passing through the support structure is reduced, thereby reducing the light reflectivity of the display panel, improving the contrast of the display panel, and further improving the image quality of the display module.

Description

[Technical field]

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

[0002] With the continuous development of display technology, the application of display modules and display devices is becoming more and more extensive, and consumers' requirements for display are also getting higher and higher. At present, the three core development trends of display devices are modularization of display modules, reducing the reflectivity of display modules, and thinning of display modules. For display modules, the thickness of the camera and display module depends on the thickness of the display device. There are multiple film layers between the display panel and the supporting structure of the display module, which accounts for about 1 / 4 of the thickness of the entire display module, which seriously restricts the improvement of the thinning of the display module. In addition, the reflectivity of the surface of the supporting structure of the existing display module is relatively high. In real usage scenarios, due to the influence of ambient light, the reflectivity of the display panel will affect the contrast of the picture, thereby affecting the user's viewing experience. [Summary of the invention]

[0003] In order to solve the above problems, the present invention provides a display module and a manufacturing method thereof, and a display device, which can effectively reduce the surface reflectivity of the supporting structure in the display module and the thickness of the display module.

[0004] In a first aspect, an embodiment of the present application provides a display module, comprising: a display panel; a supporting structure, wherein the supporting structure is arranged on one side of the display panel, and the side of the display panel facing away from the supporting structure is a light emitting side, the material of the supporting structure comprises metal, and the content of free electrons on the surface of the supporting structure facing the display panel is less than the content of free electrons on the surface of the supporting structure facing away from the display panel.

[0005] In a second aspect, an embodiment of the present application further provides a method for preparing a display module, comprising the following steps:

[0006] A display panel and a support structure are provided, wherein the support structure is arranged on one side of the display panel, a side of the display panel away from the support structure is a light emitting side, and the material of the support structure includes metal;

[0007] A surface of the support structure facing the display panel is modified so that the amount of free electrons emitted from the surface of the support structure facing the display panel is greater than the amount of free electrons emitted from the surface of the support structure facing away from the display panel.

[0008] In a third aspect, an embodiment of the present application further provides a display device, wherein the display device comprises the display module described in the first aspect or the display module prepared by the preparation method described in the second aspect.

[0009] The technical solutions provided by the embodiments of the present application may include the following beneficial effects:

[0010] In the display module and the display device of the present application, the content of free electrons on the side of the support structure facing the display panel is less than the content of free electrons on the side of the support structure facing away from the display panel. This setting reduces the content of free electrons on the side of the support structure facing the display panel, thereby reducing the reflected light reflected onto the display panel after passing through the support structure, reducing the light reflectivity of the display panel, increasing the contrast of the display panel, and improving the display quality of the display module. In addition, since there is no Foam / PI / PET layer between the display panel and the support structure of the present application, it can significantly reduce the thickness of the display module.

[0011] In the preparation method of the display module of the present application, through modification treatment, the content of free electrons on the side of the support structure made of metal material facing the display panel is less than the content of free electrons on the side of the support structure facing away from the display panel. This setting reduces the content of free electrons on the side of the support structure facing the display panel, thereby reducing the reflected light reflected onto the display panel after passing through the support structure, reducing the light reflectivity of the display panel, and improving the display quality of the display module. The preparation method of the present application has a simple process and does not require additional coating, which is beneficial to the thinning of the display module.

Description of the Drawings

[0012] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings required for use in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those of ordinary skill in the art, other drawings can be obtained based on these drawings without creative efforts.

[0013] Figure 1 is a side view of the display module of the prior art 1;

[0014] Figure 2 is a side view of the display module with the Foam / PI / PET layer removed and a black coating provided on the surface of the support structure;

[0015] Figure 3 is a side view of the display module of the present application;

[0016] Figure 4 is a side view of the display panel of the present application;

[0017] Figure 5 is a side view of another embodiment of the display module of the present application;

[0018] Figure 6Side schematic view of the surface of the support structure of the present application facing the display panel with a rough surface;

[0019] Figure 7 Side schematic view of the rough surface of the present application with an adhesive layer provided thereon;

[0020] Figure 8 Side schematic view of a black coating provided between the support mechanism and the display panel of the present application;

[0021] Figure 9 Side schematic view of a film layer provided between the support mechanism and the display panel of the present application;

[0022] Figure 10 Schematic diagram of the light transmission path after the incident light of the present application enters the film layer;

[0023] Figure 11 Side schematic view of a film layer and a black coating provided between the support structure and the display panel of the present application;

[0024] Figure 12 Flow chart of the preparation of the display module of the present application;

[0025] Figure 13 Side schematic view of the display device of the present application.

Detailed implementation manners

[0026] In order to better understand the technical solution of the present invention, the embodiments of the present invention will be described in detail below with reference to the accompanying drawings.

[0027] It should be clear that the described embodiments are only a part of the embodiments of the present invention, rather than all of the embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts belong to the scope of protection of the present invention.

[0028] The terms used in the embodiments of the present invention are only for the purpose of describing specific embodiments, and are not intended to limit the present invention. The singular forms of "a", "the" and "said" used in the embodiments of the present invention and the appended claims are also intended to include the plural forms, unless the context clearly indicates otherwise.

[0029] It should be understood that the term " / and" used herein is only a description of the association relationship of associated objects, indicating that three relationships may exist. For example, A and / or B may represent: A exists alone, A and B exist simultaneously, and B exists alone. In addition, the character " / " in this article generally represents an "or" relationship between the associated objects before and after.

[0030] As described in the background art, contrast is one of the most important indicators for evaluating the image quality of a display module. In a real usage scenario, due to the influence of ambient light, the reflectivity of the display panel will affect the contrast of the image, thereby affecting the viewing experience of the customer. Therefore, in order to suppress stray light, the temperature increase caused by light, or increase the light transmittance, it is usually necessary to reduce the reflectivity reflected to the display panel.

[0031] The common way to reduce the reflectivity of the optical surface is to add an anti-reflection film, which is also called an anti-reflection film. It is set between the display panel and the support structure, which can not only reduce the surface reflectivity but also increase the transmittance. Usually, a thin film of one or more materials is deposited on the optical surface, and the thickness of the thin film is determined according to the anti-reflection conditions. As Figure 1 shown, it is a schematic structural diagram of a display module in Related Art 1. Refer to Figure 1 , the display module includes a display panel, a PSA (Pressure Sensitive Adhesive) film layer, a BP (Back Plate) lower film, a PSA film layer, a Foam / PI / PET layer, a PSA film layer, and a support structure that are stacked. Among them, the Foam / PI / PET layer exists as an anti-reflection film. Among them, Foam (foam), PI (Polyimide), and PET (Polyethylene terephthalate) have chromatic dispersion due to the above-mentioned film materials, resulting in the fact that this method usually only has anti-reflection characteristics in a limited wavelength region. The reflectivity of the incident light reflected to the display panel through the Foam / PI / PET layer is about 5%. To obtain an anti-reflection film with a wide wavelength band, complex optimization design and preparation are usually required. In addition, due to the existence of multiple film layers between the display panel and the support structure, the thickness of the display module is relatively thick, which accounts for about 1 / 4 of the display module, and is not conducive to the thinning of the display module.

[0032] To solve the above problems, the applicant envisions removing the Foam / PI / PET layer in the display module and then setting a black coating on the surface of the support structure to obtain a support structure with a black coating (as Figure 2 shown). By setting the black coating, part of the light wave incident on the support structure can be absorbed, thereby reducing the reflectivity reflected to the display panel, and at the same time, it can play a role in thinning. However, after thinning the display module by removing the Foam / PI / PET layer, the surface reflectivity of the support structure reaches 6%, which is slightly greater than the surface reflectivity of the structure containing the Foam / PI / PET layer, exacerbating the display defect problem of the display panel.

[0033] Based on the above considerations, in order to solve the problems of high reflectivity and thick thickness of the display module, the applicant has conducted in-depth research and provided a display module. By removing the film layer between the display panel and the support structure, the thinning of the module is achieved. Moreover, in this application, the content of free electrons on the surface of the support structure facing the display panel is less than the content of free electrons on the surface of the support structure facing away from the display panel, thereby reducing the reflectivity of the display panel, improving the contrast of the display panel, and avoiding the problem of poor display caused by the high reflectivity of the support structure.

[0034] Specifically, the display module 10 provided in the embodiment of the present application includes: a display panel 1 and a support structure 2. The support structure 2 is disposed on one side of the display panel 1. The side of the display panel 1 facing away from the support structure 2 is the light-emitting side, as Figure 3 shown, Figure 3 which is a side schematic view of a display module provided in an embodiment of the present application.

[0035] Exemplarily, the display panel 1 is an OLED (Organic Light-Emitting Diode), as Figure 4 shown. The OLED display panel 1 includes an array substrate 11, a light-emitting layer 12, and a packaging layer 13 stacked in sequence. Among them, the array substrate 11 is mainly used to control the pixel units in the light-emitting layer 12. Exemplarily, the pixel units include at least two colors of sub-pixels: PX1, PX2, and PX3, so that the OLED display panel 1 presents different colors. The array substrate includes a plurality of pixel circuits arranged in an array. The pixel circuit includes a thin-film transistor (TFT) and a pixel unit connected to the pixel circuit. During the preparation process of the array substrate, the same film layer adopts the same process, and the active layers between different pixel circuits are an integrated graphic structure. The active layer itself is not conductive, and partial regions are made conductive by doping the active layer. The conductive active layer can be electrically connected to the wiring layer to replace part of the wiring. Specifically, optionally, the active layer of each transistor includes a polysilicon active layer or a metal oxide active layer. The polysilicon active layer can be formed by using low-temperature polysilicon (LTPS) technology, which has the advantages of simple structure, good stability, high electron mobility, and small circuit area. Optionally, the active layer can adopt low-temperature polycrystalline oxide (LPTO).

[0036] In other embodiments, the display panel 1 may also be an LCD panel (Liquid Crystal Display), and the LCD display panel in the related art includes a backlight source, a lower polarizer, an array substrate, a liquid crystal layer, a color filter film, an upper polarizer, and a transparent cover plate which are stacked. Among them, the backlight source is mainly used to provide light for the LCD screen, and the array substrate is mainly used to control the deflection of liquid crystal molecules in the liquid crystal layer so that light beams of different brightness reach the color filter film. The color filter film is provided with sub-pixels of multiple colors arranged in an array, which is used to make the LCD display panel display different colors. Of course, the display panel may also be other display panels, such as Micro-LED (using self-luminous micron-scale LEDs as light-emitting pixel units), MiniLed (LED devices with chip sizes between 50 and 200 μm), and quantum dots, etc., which will not be elaborated here.

[0037] It should be noted that this application does not make specific restrictions on whether the display panel is a flexible display panel or a rigid display panel. When the display panel of this application is a flexible display panel, the display module 10 is a flexible display module, and the flexible display module can be switched between a flattened state and a bent state. When the flexible display module is in the flattened state, the display surface of the flexible display panel is flat, and the user can see a flat image through the flat-shaped flexible display module; when the flexible display module is in the bent state, the display surface of the flexible display panel is curved, and the user can see a curved image through the flexible display module, enriching the viewing angle of the user. In the embodiments of this application, a conventional rotating shaft or rotating component in the art is used to control the switching of the flexible display module between the flattened state and the bent state.

[0038] In the embodiments of this application, the support structure 2 is located on the side of the display panel 1 away from its light-emitting side. For example, Figure 3 the arrow direction Z in represents the light-emitting direction of the display module 10. For a flexible display panel, its substrate is a flexible substrate, so its edge is prone to bending, and its surface is also prone to being scratched. By setting the support structure 2 on the side of the substrate of the display panel 1 away from the light-emitting side, on the one hand, it can prevent the edge of the substrate from bending and play a supporting role, and on the other hand, it can also prevent the substrate from being scratched. The support structure is a structure that originally exists in the display module.

[0039] In the embodiments of this application, the material of the support structure 2 is metal. There are free electrons in the metal material. By reducing the content of free electrons on the surface of the support structure 2 facing the display panel 1, the reflectivity of light on the display panel 1 can be reduced. Moreover, the support structure 2 made of metal is beneficial to enhancing the overall structural strength when cooperating with the display module 10, and thus ensuring the stability of the overall structure. For example, the material of the support structure 2 can be aluminum alloy, copper alloy, and stainless steel materials, etc.

[0040] As shown Figure 4 in the figure, a support film 6 is further provided on one side of the display panel 1 opposite to the light-emitting side of the display panel 1. A first adhesive layer 7 is provided between the display panel 1 and the support film 6, and a second adhesive layer 8 is further provided between the support film 6 and the support structure 2. The setting of the support film 6 provides a support function for the display panel 1, and the setting of the adhesive layer integrates the entire display module 10. Exemplarily, the materials of the first adhesive layer 7 and the second adhesive layer can be PSA (Pressure Sensitive Adhesive) adhesive layers. PSA has high adhesion, small curing shrinkage, strong water and high temperature resistance, and excellent filling performance for fitting step difference. Therefore, connecting each film layer through the PSA optical adhesive layer can extend the service life and enhance the reliable performance of the display module.

[0041] It should be noted that Figure 3 only the display module 10 of the present application is schematically illustrated by taking a rectangular display device as an example, and the specific shape of the display module is not limited. In some other embodiments of the present invention, the shape of the display module 10 can also be embodied as other shapes different from rectangles, such as circles, ellipses, etc. Additionally, Figure 3 and Figure 1 only the relative positional relationship between the display panel 1, the support structure 2 and other film layers in the display module is schematically illustrated, and does not represent the actual sizes of each film layer.

[0042] For the display module 10 provided by the present application, the support structure 2 made of a metal material has a first surface facing the display panel 1 and a second surface facing away from the display panel 1. As Figure 6 shown in the figure, 2A represents the first surface of the support structure 2, and 2B represents the second surface of the support structure 2. The content of free electrons on the first surface 2A of the support structure 2 is less than the content of free electrons on the second surface 2B of the support structure 2. With such a setting, the content of free electrons on the first surface 2A of the support structure 2 is less, so that the reflected light reflected by the support structure 2 onto the display panel 1 is reduced, thereby reducing the light reflectance of the display panel 1, increasing the contrast of the display panel 1, and further improving the image quality of the display module 10. In addition, since there is no Foam / PI / PET layer between the display panel 1 and the support structure 2 of the present application, it can significantly reduce the thickness of the display module 10.

[0043] It can be understood that for the support structure 2 made of metal, neutral atoms or metal ions are arranged at the nodes of the metal lattice, and electrons are at the interstitial sites of the nodes. Metallic bonds are formed by sharing these electrons. Therefore, there are a large number of free electrons in the metal. When the support structure made of metal is irradiated with light, the free electrons in the metal undergo forced vibrations, generating oscillations with the same frequency as the incident light and emitting light with the same frequency as the original light, that is, reflected light. The reflected light will irradiate the display panel 1 again, thus affecting the contrast of the display panel 1 and further affecting the user's viewing experience. In this application, by reducing the content of free electrons on the first surface 2A of the support structure 2, the reflectivity of light reflected from the support structure 2 to the display panel 1 is reduced, thereby improving the contrast of the display panel 1 and enhancing the display effect of the display panel 1.

[0044] As Figure 6 shown, the first surface 2A of the support structure 2 is an uneven rough surface. In this application, by reducing the flatness of the surface of the support structure 2 facing the display panel 1, the refraction path and scattering path of light irradiated on the rough surface can be increased, so that the reflectivity of light reflected from the support structure 2 to the display panel 1 is reduced, thereby improving the contrast of the display panel 1 and enhancing the display effect of the display panel 1. Compared with the existing support structure 2, the surface of the existing support structure 2 has a higher flatness, and its surface roughness Ra is generally less than 0.5 μm, which is beneficial to the flatness of the bonding process and the water contact angle required for bonding. However, when light passes through the surface of the support structure 2 with a higher flatness, almost all the light will be reflected to the display panel 1, resulting in a larger light reflectivity of the display panel 1, which is not conducive to improving the contrast of the display module 10.

[0045] Exemplarily, the roughness Ra of the rough surface is 1 μm to 5 μm, for example, it can be 1 μm, 2 μm, 3 μm, 4 μm, 5 μm, etc. Controlling the roughness of the rough surface within the above range can reduce the reflectivity of light on the display panel 1 while reducing the crease problem generated when the display panel 1 close to the support structure 2 is bent. Since the support structure 2 close to the display panel 1 has an uneven surface, when the display module 10 is bent, the uneven support structure will exert uneven stress on the display panel 1, resulting in a crease problem on the display panel 1, affecting the display problem of the display module 10 and at the same time reducing the aesthetic appearance of the display screen. Therefore, the roughness of the rough surface in this application is small, and the influence on the display panel during bending is small.

[0046] Exemplarily, the rough surface of the support structure 2 is formed by protrusions and / or depressions on the surface of the support structure 2. Preferably, in order to avoid the support structure 2 exerting a large force on the display panel 1 during bending, resulting in creases or surface unevenness problems on the display panel 1, as Figure 6As shown, the rough surface of the support structure 2 is formed by a number of depressions on the surface of the support structure 2. This application places no restrictions on the shapes of the grooves and protrusions. For example, they can be spherical, pit-shaped, square, irregular shapes, etc., and this application does not limit them here.

[0047] As Figure 7 shown, an adhesive layer 3 is provided on the surface of the rough surface. The adhesive layer 3 can fill the protrusions and depressions of the support structure 2, so that the surface of the overall structure composed of the adhesive layer 3 and the support structure 2 is flat, thereby avoiding creases when the display panel 1 is bent. At the same time, the presence of the adhesive layer 3 will not have a great impact on the light reflectivity of the display panel 1. Moreover, the adhesive layer 3 here can also act as an adhesive connection layer between the BP lower film 6 and the support structure 2, eliminating the need to set up a second adhesive layer 8, which is beneficial to reducing the thickness of the display module 10.

[0048] Exemplarily, the material of the adhesive layer 3 can be PSA (Pressure Sensitive Adhesive), and of course, other materials such as OCA (Optically Clear Adhesive) can also be used, and this application does not limit them here.

[0049] Exemplarily, the thickness of the adhesive layer 3 is 15μm - 25μm. Exemplarily, the thickness of the adhesive layer 3 can be, for example, 15μm, 16μm, 17μm, 18μm, 19μm, 20μm, 21μm, 22μm, 23μm, 24μm, and 25μm, etc. The presence of the adhesive layer within the above thickness range can reduce the influence of the rough surface on the display panel and can also play a certain adhesive role.

[0050] As Figure 8 shown, a black coating 4 is provided between the support structure 2 and the display panel 1. The material of the black coating 4 can be an organic material or an inorganic material. Exemplarily, the material of the black coating 4 includes at least one of black paint, carbon black, ink, black nickel, and metal carbide. Among them, the metal carbide includes at least one of nickel carbide, tungsten carbide, zirconium carbide, chromium carbide, and iron carbide. It can be understood that the presence of the black coating 4 can reduce the light reflectivity of the surface of the support structure 2, thereby reducing the influence of the reflected light on the display panel 1.

[0051] The black coating 4 contains scattering particles, and the scattering particles include at least one of aerosol particles and organic polymer hollow microspheres. Among them, aerosol refers to various solid particles and small liquid particle groups in the atmosphere, which exist as a dispersion system in the black coating 4. When incident light irradiates the black coating 4, the incident light is scattered at the aerosol particles, thereby increasing the transmission path of the incident light in the black coating 4, and thus reducing the light reflectance of the incident light reflected to the display panel 1. The organic polymer hollow microsphere refers to a spherical, bead-shaped or bubble-shaped substance with a polymer shell and filled with gas in the middle, and the polymer is a thermoplastic or thermosetting resin capable of obtaining a stable shape. The organic polymer hollow microspheres can be obtained by special emulsion polymerization methods, thermal expansion methods and other methods, which are not limited in this application. When incident light irradiates the black coating 4, the incident light is scattered at the organic polymer hollow microspheres, thereby increasing the transmission path of the incident light in the black coating 4, and thus reducing the light reflectance of the incident light reflected to the display panel 1. In some embodiments, the particle size of the scattering particles is in the micron or nanometer range.

[0052] Exemplarily, the scattering particles can be evenly dispersed in the black coating 4, or can be distributed regularly in the black coating 4, that is, the content of the scattering particles in the center of the black coating 4 is greater than the content of the scattering particles at the edge of the black coating 4. Preferably, when the content of the scattering particles in the central region of the black coating 4 is greater than the content of the scattering particles in the edge region of the black coating 4, diffuse reflection can occur when light irradiates the central region of the black coating 4, so that more reflection and refraction of light occur in the black coating 4, resulting in enhanced interference, so that a part of the light is filtered out, thereby reducing the reflectance of the light reflected to the display panel 1.

[0053] Exemplarily, the thickness of the black coating 4 is 1 μm to 5 μm. For example, it can be 1 μm, 2 μm, 3 μm, 4 μm and 5 μm, etc. If the thickness of the black coating 4 is greater than 5 μm, the process difficulty and preparation cost increase, and the light reflectance after the light passes through the black coating 4 decreases insignificantly. If the thickness of the black coating 4 is less than 1 μm, the ability of the black coating 4 to absorb light is limited, and the light reflectance cannot be effectively reduced.

[0054] As Figure 9 shown, a film layer 5 is provided between the support structure 2 and the display panel 1. The material of the film layer 5 includes at least one of Fe3O4, Fe2O3, Cr2O3, TiO2, Ti2O3 and Al2O3. The formation of the film layer 5 with the above materials enables interference enhancement to occur after light irradiates the film layer 5, thereby forming interference enhancement of required colors such as black, gray, and amber, so as to be able to filter out easily reflected light waves, thereby reducing the light reflectance reflected to the display panel 1.

[0055] Exemplarily, the thickness of the film layer 5 is 0.1 μm to 10 μm. Specifically, the thickness of the film layer 5 can be 0.1 μm, 0.5 μm, 1 μm, 3 μm, 5 μm, 7 μm, 9 μm, 10 μm, etc. The film layer 5 with the above specific thickness can ensure that the incident light incident on the film layer 5 undergoes an interference enhancement phenomenon.

[0056] As Figure 10 shown, B0 represents the incident light incident on the surface of the incident support structure 2, B1 represents the reflected light directly reflected from the surface of the incident light entering the film layer 5, and B2 represents the refracted light of the incident light B0 refracted by the film layer 5 and then reflected from the lower surface of the film layer 5 to the display panel 1, that is, there are two different transmission paths for the incident light after passing through the film layer 5. Although B1 and B2 can reach the display panel 1 at the same time and reach the human eye through the display panel 1, the distances of B1 and B2 entering the human eye are different. Among the light waves after reflection and refraction, peak + peak or valley + valley is the strong light of the corresponding wavelength. The incident light is enhanced after passing through the film layer 5 within the above thickness range, resulting in an interference phenomenon, so that the light waves that are easily reflected are filtered out, thereby reducing the reflectivity of the light reflected to the display panel 1.

[0057] As Figure 11 shown, the film layer 5 can also be disposed between the black coating 4 and the display panel 1. This scheme of superimposing the film layer 5 and the black coating 4 can enable the incident light of the incident support structure 2 to first undergo a light interference enhancement phenomenon, filtering out some light waves that are easily reflected, and a part of the other light waves is absorbed during the process of incident on the black coating 4, thereby further reducing the reflectivity of the light on the display panel 1.

[0058] Based on the same inventive concept, on the basis of the embodiments of the present application, the embodiments of the present application further provide a method for manufacturing a display module 10. The present application uses a simple process to modify the surface of the support structure 2 facing the display panel 1, which can significantly reduce the light reflectivity of the display panel 1. For details, please refer to Figure 12 , Figure 12 which is the flowchart of the method for manufacturing the display module 10 of the present application, and includes the following specific steps:

[0059] S1: Provide the display panel 1 and the support structure 2. The display panel 1 and the support structure 2 are as described above and will not be elaborated here.

[0060] S2: Modify the surface of the support structure 2 facing the display panel 1 so that the amount of free electrons escaping from the surface of the support structure 2 facing the display panel 1 is greater than the amount of free electrons escaping from the surface of the support structure 2 facing away from the display panel 1.

[0061] The reflectivity of the support structure 2 is mainly caused by the oscillation of free electrons on the surface of the support structure 2 made of metal material. In this application, the surface of the support structure 2 facing the display panel 1 is modified, so that the free electrons on the surface of the support structure 2 facing the display panel 1 escape, and the amount of free electrons escaping from the surface of the support structure 2 facing the display panel 1 is greater than that of the free electrons escaping from the surface of the support structure 2 facing away from the display panel 1. That is, the content of free electrons on the surface of the support structure 2 facing the display panel 1 is less than the content of free electrons on the surface of the support structure 2 facing away from the display panel 1. The content of free electrons on the surface of the support structure 2 facing the display panel 1 is less, so that the reflected light reflected to the display panel 1 after passing through the support structure 2 is reduced, thereby reducing the light reflectivity of the display panel 1, thereby improving the contrast of the display panel 1, and further improving the image quality of the display module 10.

[0062] It can be understood that in this application, through the modification treatment, not only can the free electrons inside the support structure 2 escape, but also the free electrons on the surface of the support structure 2 can escape, while the electrons on the side of the support structure 2 facing away from the display panel 1 will not or hardly escape.

[0063] The free electrons inside the metal move randomly in thermal motion, and their speeds have a certain distribution. There is a force on the metal surface that hinders the escape of free electrons. The electrons need to overcome the resistance to do work to escape, which is called the work function. At room temperature, only a very small amount (negligible) of free electrons have kinetic energy exceeding the work function, and the free electrons spilling out from the metal surface are negligible. By at least one of high-temperature bombardment, high-voltage electric field bombardment, and particle bombardment, the energy of the free electrons on the surface of the support structure 2 near the display panel 1 can exceed its work function, resulting in a large number of free electrons on the surface of the support structure 2 near the display panel 1 spilling out from the metal surface, reducing the free electrons on the surface of the support structure 2 facing the display panel 1, thereby reducing the light reflectivity of the display panel 1.

[0064] Exemplarily, the temperature of the high-temperature bombardment is 800°C to 1300°C. Exemplarily, the temperature of the high-temperature bombardment can be, for example, 800°C, 900°C, 1000°C, 1100°C, 1200°C, and 1300°C, etc. Through the high-temperature bombardment of 800°C to 1300°C, the energy generated by the high-temperature heating makes the free electrons on the surface of the support structure 2 near the display panel 1 exceed its work function, resulting in a large number of free electrons in the support structure 2 near the display panel 1 spilling out from the metal surface, reducing the free electrons on the surface of the support structure 2 facing the display panel 1, thereby reducing the light reflectivity of the display panel 1.

[0065] Exemplarily, the pressure of high-voltage electric field bombardment is 700 MPa to 1600 MPa. Specifically, the pressure of high-voltage electric field bombardment is 700 MPa, 800 MPa, 900 MPa, 1000 MPa, 1100 MPa, 1200 MPa, 1300 MPa, 1400 MPa, 1500 MPa, 1600 MPa, etc. Under the electric field bombardment within the above pressure range, the free electrons on the side of the support structure 2 close to the display panel 1 can escape by crossing the potential barrier, reducing the free electrons on the surface of the side of the support structure 2 facing the display panel 1, thereby reducing the light reflectivity of the display panel 1.

[0066] Exemplarily, the energy of particle bombardment is greater than the electron work function of the support structure 2, so that the free electrons on the side of the support structure 2 close to the display panel 1 can escape by crossing the potential barrier, reducing the free electrons on the surface of the side of the support structure 2 facing the display panel 1, thereby reducing the light reflectivity of the display panel 1.

[0067] Exemplarily, the modification treatment is carried out in a vacuum or inert gas protection atmosphere, which can protect the surface of the support structure 2 on the side close to the display panel 1 and avoid being affected by the electron contamination generated during the modification treatment of the support structure 2. Exemplarily, the inert gas can be nitrogen, argon, helium, etc.

[0068] In some embodiments, the preparation method further includes: roughening the surface of the side of the support structure 2 facing the display panel 1, so that the side of the support structure 2 facing the display panel 1 has an uneven rough surface. The roughening treatment can be carried out during the preparation of the support structure 2. For example, during the preparation of the support structure 2, the annealing time of rolling the support structure 2 can be reduced, the surface processing after rolling can omit steps such as flat grinding, fine polishing of mirror processing and friction with rough steel wool, so that the side of the support structure 2 facing the display panel 1 has pits, erosion points, rolling marks and impurities, etc.

[0069] In the present application, the roughness of the rough surface of the support structure 2 is not the larger the better. It needs to be limited within a certain range to be able to increase the refraction and scattering paths of light without affecting the use of the display panel 1. The roughness of the rough surface is 1 μm to 5 μm. If the roughness of the rough surface is greater than 5 μm, when the support structure 2 and the display panel 1 are stacked and used, uneven phenomena such as protrusions and pits are likely to appear on the display panel 1, and it will also cause obvious crease problems after the display panel 1 is bent. If the roughness of the rough surface is less than 1 μm, the effect of reducing the light reflectivity is not obvious.

[0070] In the present application, by coating an adhesive material on the rough surface of the support structure 2 facing the display panel 1, a relatively flat structure is formed on the surface of the support structure 2 facing the display panel 1, reducing the adverse effect of the rough surface on the display panel 1.

[0071] Exemplarily, the material of the adhesive layer can be PSA (Pressure Sensitive Adhesive), and of course, other materials such as OCA (Optically Clear Adhesive) can also be used. The present application does not limit this here.

[0072] In some embodiments, the method for manufacturing the display module 10 further includes: coating a black coating on the side of the support structure 2 facing the display panel 1, where the black coating contains scattering particles, that is, the method for manufacturing the display module 10 includes:

[0073] S1: Provide the display panel 1 and the support structure 2.

[0074] S2: Modify the surface of the side of the support structure 2 facing the display panel 1 so that the amount of free electrons escaping from the surface of the side of the support structure 2 facing the display panel 1 is greater than the amount of free electrons escaping from the surface of the side of the support structure 2 facing away from the display panel 1.

[0075] S3: Coat a black coating on the side of the support structure 2 facing the display panel 1, where the black coating contains scattering particles.

[0076] Exemplarily, the black coating is applied by a conventional coating method in the art, such as spraying, spin coating, evaporation coating, physical vapor deposition (PVD), electroplating, and screen printing.

[0077] Exemplarily, the material of the black coating 4 can be an organic material or an inorganic material. Exemplarily, the material of the black coating 4 is at least one of black paint, carbon black, ink, black nickel, and metal carbide. Before coating, the scattering particles are added to the black coating, where the scattering particles include at least one of aerosol particles and organic polymer hollow microspheres, and after mixing them evenly under stirring conditions, they are coated on the surface of the side of the support structure 2 facing the display panel 1.

[0078] In some embodiments, in order to further reduce the free electrons on the surface of the support structure 2 facing the display panel 1, the content of the scattering particles at the center of the black coating 4 can be made greater than the content of the scattering particles at the edge of the black coating 4 by applying the black coating multiple times, so that when light irradiates the central region of the black coating 4, diffuse reflection can occur, so that more reflection and refraction of light occur in the black coating 4, resulting in interference enhancement or interference cancellation, so that a part of the light is filtered out, thereby reducing the reflectivity of the light reflected to the display panel 1.

[0079] In some embodiments, the method for manufacturing the display module 10 further includes: after performing a modification treatment on the support structure 2, performing an infiltration treatment on the support structure to form a film layer between the support structure 2 and the display panel 1. The specific manufacturing process is as follows:

[0080] 1): Mix chromic acid and a strong acid to obtain a precursor.

[0081] Exemplarily, the strong acid includes at least one of sulfuric acid, nitric acid, and hydrofluoric acid.

[0082] Exemplarily, the volume ratio of chromic acid to the strong acid is 1:(3 - 5). Exemplarily, the volume ratio of chromic acid to the strong acid can be, for example, 1:3, 1:4, and 1:5, etc. Under the above ratio limitation, it is beneficial to obtain a film layer with a desired thickness.

[0083] 2): Use the precursor to perform an infiltration treatment on one side of the support structure 2 facing the display panel 1.

[0084] In some embodiments, the temperature of the infiltration treatment is 50°C - 150°C. Specifically, the temperature of the infiltration treatment can be, for example, 50, 60, 70, 80, 90, 100, 110, 120, 130, 140, and 150, etc.

[0085] In some embodiments, the time of the infiltration treatment is 3 min - 60 min. Specifically, the time of the infiltration treatment is 30 min, 40 min, 50 min, and 60 min, etc.

[0086] Within the above temperature and time ranges of the infiltration treatment, it is beneficial to form a film layer 5 with a stable thickness.

[0087] In this application, for the surface treatment of the support structure 2, a black coating can be selectively applied or infiltration treatment can be carried out using a precursor. The above coatings can also be provided on the surface of the support structure 2. The coating sequence is as follows: first, a black coating 4 is applied on the side of the support structure 2 facing the display panel 1, and then infiltration treatment is carried out on the surface of the black coating 4 using a precursor to form a film layer 5. The above setting method can enable the incident light to form interference enhancement when it irradiates on the side of the support structure 2 facing the display panel 1. Thus, interference enhancement of required colors such as black, gray, and amber is formed, so that the light waves that are easily reflected can be filtered out. A part of the incident light irradiates on the black coating 4 after passing through the film layer 5, and the black coating 4 absorbs a part of the light waves, thereby reducing the reflected light of the incident light reflected onto the display panel 1.

[0088] In summary, this application provides a display module 10 and a preparation method thereof. By removing the Foam / PI / PET layer between the display panel 1 and the support structure 2, modifying the first surface 2A of the support structure 2, roughening it, providing the black coating 4 and the film layer 5, the light reflectance of the light reflected onto the display panel 1 after passing through the support structure 2 is reduced, thereby improving the contrast of the display module 10 and the display effect of the display module 10. At the same time, the thickness of the display module 10 can also be reduced.

[0089] The embodiment of this application also provides a display device, such as Figure 13 shown Figure 13 is a schematic diagram of a display device provided by the embodiment of this application. The display device includes the above-mentioned display module 10. The specific structure of the display module 10 has been described in detail in the above embodiment and will not be repeated here. Of course, Figure 13 The display device shown is only for illustration. The display device can be any electronic device with a display function, such as a mobile phone, a tablet computer, a notebook computer, an e-reader, or a television.

[0090] Such as Figure 13 shown, the display device further includes a light sensor 20, and the light sensor 20 is provided corresponding to the through hole 201 of the display panel.

[0091] The above are only the preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principles of the present invention shall be included within the scope of protection of the present invention.

Claims

1. A display module, characterized in that, Comprising: A display panel; A support structure, the support structure being disposed on one side of the display panel, the side of the display panel facing away from the support structure being the light-emitting side, the material of the support structure including metal, and the content of free electrons on the surface of the side of the support structure facing the display panel being less than the content of free electrons on the surface of the side of the support structure facing away from the display panel.

2. The display module according to claim 1, wherein The side of the support structure facing the display panel has an uneven rough surface.

3. The display module according to claim 2, wherein An adhesive layer is provided on the surface of the rough surface.

4. The display module according to claim 1, wherein A black coating is provided between the support structure and the display panel, and the black coating contains scattering particles.

5. The display module according to claim 4, wherein, The material of the black coating includes at least one of black paint, nano carbon black, ink, black nickel, and metal carbide; and / or The scattering particles include at least one of aerosol particles and organic polymer hollow microspheres.

6. The display module according to claim 4, wherein The display module includes at least one of the following features (1) to (3): (1) The content of scattering particles at the center of the black coating is greater than the content of scattering particles at the edge of the black coating; (2) The scattering particles are uniformly distributed in the black coating; (3) The thickness of the black coating is 1 μm to 5 μm.

7. The display module according to claim 1, characterized in that, A film layer is provided between the support structure and the display panel, the material of the film layer includes at least one of Fe3O4, Fe2O3, Cr2O3, TiO2, Ti2O3, and Al2O3, and the thickness of the film layer is 0.1 μm to 10 μm.

8. The display module according to claim 4, wherein A film layer is provided between the black coating and the display panel, the material of the film layer includes at least one of Fe3O4, Fe2O3, Cr2O3, TiO2, Ti2O3, and Al2O3, and the thickness of the film layer is 0.1 μm to 10 μm.

9. A method for preparing a display module, characterized in that, Including the following steps: Providing a display panel and a support structure, the support structure being disposed on one side of the display panel, the side of the display panel facing away from the support structure being the light-emitting side, and the material of the support structure including metal; Performing a modification treatment on the surface of the side of the support structure facing the display panel, such that the amount of free electrons escaping from the surface of the side of the support structure facing the display panel is greater than the amount of free electrons escaping from the surface of the side of the support structure facing away from the display panel.

10. The preparation method according to claim 9, wherein, The modification treatment includes at least one of high-temperature bombardment, high-voltage electric field bombardment, and particle bombardment.

11. The preparation method according to claim 9, wherein The modification treatment is performed in a vacuum or an inert gas protection atmosphere.

12. The preparation method according to claim 9, characterized in that, The preparation method further includes: performing a rough treatment on the side of the support structure facing the display panel.

13. The preparation method according to claim 12, wherein After performing the rough treatment on the side of the support structure facing the display panel, it further includes: coating an adhesive material on the rough surface formed by the rough treatment of the support structure.

14. The preparation method according to claim 9, characterized in that, The preparation method further includes: coating a black paint containing scattering particles on the side of the support structure facing the display panel.

15. The preparation method according to claim 9, wherein The preparation method further includes: Mixing chromic acid and a strong acid to obtain a precursor, wherein the strong acid includes at least one of sulfuric acid, nitric acid, and hydrofluoric acid; Performing an infiltration treatment on the side of the support structure facing the display panel using the precursor.

16. The preparation method according to claim 15, wherein, After applying a black coating on one side of the support structure facing the display panel, it further includes: Mixing chromic acid and a strong acid to obtain a precursor, wherein the strong acid includes at least one of sulfuric acid, nitric acid, and hydrofluoric acid; Using the precursor to perform an infiltration treatment on the side of the black coating facing the display panel.

17. The preparation method according to claim 15 or 16, characterized in that, The preparation method includes at least one of the following features (1) to (3): (1) The volume ratio of chromic acid to strong acid = 1:(3 - 5); (2) The temperature of the infiltration treatment is 50°C to 150°C; (3) The time of the infiltration treatment is 3 minutes to 60 minutes.

18. A display device, characterized in that The display device includes the display module according to any one of claims 1 to 8 or the display module prepared by the preparation method according to any one of claims 9 to 17.

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