Display panel, preparation method thereof and display device

Abstract

The application discloses a display panel, a preparation method thereof and a display device. The display panel comprises a substrate, a light emitting element, an anti-reflection layer, an adhesive layer and an encapsulation layer. The light emitting element is located on one side of the substrate. The anti-reflection layer at least partially surrounds the light emitting element. The adhesive layer is located on the side of the light emitting element away from the substrate, and the orthographic projection of the substrate covers the light emitting element and the anti-reflection layer. The adhesive layer comprises a substrate and phase change particles. The phase change particles have a core-shell structure, the core is a phase change material, and the shell is a scattering material. The encapsulation layer covers the adhesive layer. The phase change material is used to improve the front indentation of the display panel. The scattering material is used for display light homogenization, thereby finally improving the bonding yield and display effect of the display panel.

Description

Technical Field

[0001] Embodiments of the present invention relate to the field of display technology, and in particular to a display panel and a manufacturing method thereof, and a display device. Background Art

[0002] Currently, for Micro LED (Micro Light Emitting Diode, Micro LED) spliced ​​display screens, the module process sequence is usually to first apply an anti-glare series protective film (AG film) to the front of the screen (display area), and then bind the flexible circuit board (Flexible Panel Connector, FPC) on the back of the display. However, due to the large area of ​​FPC attached to the back, the display surface is uneven, resulting in a low film yield. At the same time, the heat resistance of the AG film material is lower than 150°C. When binding with the FPC, indentations are likely to appear on the front of the display, affecting the display effect of the display panel. Summary of the Invention

[0003] The present invention provides a display panel, a preparation method thereof, and a display device, which utilize phase change materials to improve the problem of indentation on the front surface of the display panel and utilize scattering materials to display uniform light, thereby ultimately improving the display effect of the display panel.

[0004] In a first aspect, an embodiment of the present invention provides a display panel, including:

[0005] substrate;

[0006] A light emitting element is located on one side of the base substrate;

[0007] an anti-reflection layer at least partially surrounding the light-emitting element;

[0008] an adhesive layer, located on a side of the light-emitting element facing away from the base substrate, and covering the light-emitting element and the anti-reflection layer in an orthographic projection of the base substrate; the adhesive layer comprises a base and phase-change particles; the phase-change particles are of a core-shell structure, wherein the core is a phase-change material and the shell is a scattering material;

[0009] The encapsulation layer covers the adhesive layer.

[0010] Based on the same inventive concept, in a second aspect, an embodiment of the present invention further provides a method for manufacturing a display panel, for manufacturing the display panel provided in the first aspect, wherein the display panel further comprises a flexible circuit board, the flexible circuit board being located on a side of the base substrate facing away from the light-emitting element;

[0011] The preparation method comprises:

[0012] providing a substrate;

[0013] preparing a light-emitting element on one side of the base substrate;

[0014] An anti-reflection layer is formed on one side of the substrate; the anti-reflection layer at least partially surrounds the light-emitting element;

[0015] An adhesive layer is prepared on the side of the light-emitting element facing away from the base substrate; the adhesive layer covers the light-emitting element and the anti-reflection layer in the orthographic projection of the base substrate; the adhesive layer includes a base and phase change particles; the phase change particles are a core-shell structure, the core is a phase change material, and the shell is a scattering material;

[0016] preparing an encapsulation layer on a side of the adhesive layer facing away from the substrate;

[0017] The flexible circuit board is bound to a side of the base substrate facing away from the light emitting element.

[0018] Based on the same inventive concept, in a third aspect, an embodiment of the present invention further provides a display device, which includes the display panel provided in the first aspect.

[0019] The display panel provided by the embodiment of the present invention improves the flatness of the display panel and the film-lamination yield of the encapsulation layer by arranging an adhesive layer on the light-emitting side of the light-emitting element; the adhesive layer is composed of a substrate and phase change particles, the substrate phase change particles are a core-shell structure, and the core is a phase change material. The phase change material undergoes phase change when heated to absorb heat, thereby lowering the temperature of the adhesive layer and the encapsulation layer, reducing the deformation of the adhesive layer and the encapsulation layer materials during back binding, and improving the problem of indentation on the front of the display panel; at the same time, the shell is a scattering material, which plays a role in uniform light, thereby ultimately improving the display effect of the display panel. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 is a schematic top view of a display panel provided by an embodiment of the present invention;

[0021] Figure 2 yes Figure 1 A schematic cross-sectional view of a display panel along the AA' direction;

[0022] Figure 3 Schematic diagram of the structure of a phase change particle provided by an embodiment of the present invention;

[0023] Figure 4 yes Figure 1 A schematic cross-sectional view of another display panel along the AA' direction;

[0024] Figure 5 yes Figure 1 A schematic cross-sectional view of another display panel along the AA' direction;

[0025] Figure 6Schematic diagrams of the structures of two phase change particles provided by embodiments of the present invention;

[0026] Figure 7 is a schematic diagram of a method for manufacturing a display panel provided by an embodiment of the present invention;

[0027] Figure 8 It is a structural schematic diagram of a display device provided by an embodiment of the present invention. DETAILED DESCRIPTION

[0028] The present invention will be further described in detail below with reference to the accompanying drawings and examples. It will be understood that the specific embodiments described herein are merely intended to explain the present invention and are not intended to limit the present invention. It should also be noted that, for ease of description, only portions related to the present invention, rather than all structures, are shown in the accompanying drawings. It will be apparent to those skilled in the art that various modifications and variations can be made in the present invention without departing from the spirit or scope of the present invention. Therefore, the present invention is intended to cover modifications and variations of the present invention that fall within the scope of the corresponding claims (technical solutions claimed for protection) and their equivalents. It should be noted that the embodiments provided in the embodiments of the present invention can be combined with each other without contradiction.

[0029] Based on the above technical problems, the inventors further studied and proposed the technical solutions of the embodiments of the present invention. Specifically, the embodiments of the present invention provide a display panel including a base substrate, a light-emitting element, an anti-reflection layer, an adhesive layer, and an encapsulation layer, wherein the light-emitting element is located on one side of the base substrate; the anti-reflection layer at least partially surrounds the light-emitting element; the adhesive layer is located on the side of the light-emitting element facing away from the base substrate, and covers the light-emitting element and the anti-reflection layer in the orthographic projection of the base substrate; the adhesive layer includes a base and phase change particles; the phase change particles have a core-shell structure, wherein the core is a phase change material and the shell is a scattering material; and the encapsulation layer covers the adhesive layer.

[0030] The above technical solution is adopted, and by setting an adhesive layer on the light-emitting side of the light-emitting element, it is beneficial to improve the flatness of the display panel and improve the film-lamination yield of the encapsulation layer; the adhesive layer is composed of a substrate and phase change particles, and the substrate phase change particles are a core-shell structure, and the core is a phase change material. The phase change material undergoes phase change when heated to absorb heat, thereby reducing the temperature of the adhesive layer and the encapsulation layer, reducing the deformation of the adhesive layer and the encapsulation layer materials during back binding, and improving the problem of indentation on the front of the display panel; at the same time, the shell is a scattering material, which plays a role in uniform light, thereby ultimately improving the display effect of the display panel.

[0031] The above is the core concept of the present invention. The following will be combined with the accompanying drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making any creative efforts shall fall within the scope of protection of the present invention.

[0032] Figure 1 is a schematic top view of a display panel provided by an embodiment of the present invention; Figure 2 yes Figure 1 A schematic cross-sectional view of a display panel along the AA' direction; Figure 3 Schematic diagram of the structure of a phase change particle provided by an embodiment of the present invention. Figure 1-Figure 3 As shown, a display panel 200 provided by an embodiment of the present invention includes a base substrate 20, a light-emitting element 40, an anti-reflection layer 50, an adhesive layer 60 and an encapsulation layer 70, wherein the light-emitting element 40 is located on one side of the base substrate 20; the anti-reflection layer 50 at least partially surrounds the light-emitting element 40; the adhesive layer 60 is located on the side of the light-emitting element 40 away from the base substrate 20, and covers the light-emitting element 40 and the anti-reflection layer 50 in the orthographic projection of the base substrate 20; the adhesive layer 60 includes a base 61 and phase change particles 62; the phase change particles 62 are a core-shell structure, the core is a phase change material, and the shell is a scattering material; the encapsulation layer 70 covers the adhesive layer 60.

[0033] Specifically, refer to Figure 1-Figure 2 As shown, the display panel 200 may include an LED (Light Emitting Diode) display panel, a Micro LED (Micro Light Emitting Diode) display panel, a Mini LED (Mini Light Emitting Diode) display panel, etc. The embodiment of the present invention does not impose any specific restrictions on the type of the display panel 200. The display panel 200 also includes a base substrate 20 and a pixel circuit layer 30 located on one side of the base substrate 20. The base substrate 20 can be a rigid material such as glass or silicon wafer, or a flexible material such as ultra-thin glass, metal foil, or polymer plastic material. The flexible or rigid base substrate 20 can block oxygen and moisture, preventing moisture or impurities from diffusing into the display panel 200 through the base substrate 20. The pixel circuit layer 30 includes a pixel circuit. The pixel circuit can be a circuit structure such as 2T1C, 4T1C, 7T1C, 7T2C, 8T1C, and 8T2C. The pixel circuit includes a plurality of thin-film transistors, storage capacitors, and metal traces (not shown in the figure). The thin-film transistor is electrically connected to the anode of the light-emitting element 40 to provide a driving voltage to the light-emitting element 40 to drive the light-emitting element 40 to emit light. The type of the light-emitting element 40 includes but is not limited to LED, Micro LED, Mini LED, etc. The embodiment of the present invention does not specifically limit the type of the light-emitting element 40.

[0034] like Figure 1As shown, the display panel 200 includes a display area AA and a non-display area NA. The light-emitting element 40 is arranged in the display area AA for normal display of images; the non-display area NA is located at least on one side of the display area AA for setting circuit wiring and packaging frame glue, etc.

[0035] like Figure 2 As shown, the light-emitting element 40 is arranged on one side of the base substrate 20, and an anti-reflection layer 50 is arranged on the side of the base substrate 20 on the same side of the light-emitting element 40 and between adjacent light-emitting elements 40. The material of the anti-reflection layer 50 includes but is not limited to a black low-reflection layer, which is used to reduce the reflectivity of external ambient light, such as black ink.

[0036] Combine Figure 2 and Figure 3 As shown, an adhesive layer 60 is provided on the forward light-emitting side of the light-emitting element 40, and the encapsulation layer 70 covers the adhesive layer 60 to form an encapsulation film layer structure of the adhesive layer 60 + encapsulation layer 70. The adhesive layer 60 can play a role in bonding and protection, and the encapsulation layer 70 can play a role in reducing the reflectivity and glossiness of the display panel 200.

[0037] The adhesive layer 60 is formed by a mixture of a substrate 61 and phase change particles 62, wherein the material of the substrate 61 includes but is not limited to resin, such as OCA (Optically Clear Adhesive, OCA) glue, which has the advantages of being colorless and transparent, with a light transmittance of more than 90%, and good bonding strength. The use of this material is beneficial to improving the flatness of the display panel and improving the film yield of the encapsulation layer 70.

[0038] like Figure 3 As shown, the phase change particles 62 are of a core-shell structure, wherein the core is a phase change material and the shell is a scattering material. The phase change material may be an organic phase change material or an inorganic phase change material. For example, the organic phase change material may include but is not limited to high-density polyethylene, polyols, etc.; the inorganic phase change material may include but is not limited to molten salts, metals or alloys, etc. When the flexible circuit board 90 on the back of the display panel 200 is bound, the phase change material undergoes a phase change when heated and absorbs heat, which can reduce the temperature of the adhesive layer 60 and the encapsulation layer 70, reduce the deformation of the adhesive layer 60 and the encapsulation layer 70 during back binding, and avoid indentations on the front of the display panel 200.

[0039] The scattering material may include, but is not limited to, inorganic light scattering agents such as BaSO 4 and SiO 2 and organic light scattering agents such as polymethyl methacrylate (PMMA). When the display panel 200 emits light, the scattering material may even out the light and improve the display effect of the display panel.

[0040] It should be noted that the display panel 200 provided in the embodiment of the present application also includes other film layer structures, such as a buffer layer, etc., which work together to realize the display function of the display device, and will not be described in detail here.

[0041] In summary, the display panel provided by the embodiment of the present invention can improve the film lamination yield of the display panel, improve the indentation on the front side of the display panel, and ultimately improve the display effect of the display panel.

[0042] On the basis of the above embodiment, continue to refer to Figure 2 As shown, the adhesive layer 60 covers the light emitting element 40 and the anti-reflection layer 50 .

[0043] For details, please refer to Figure 2 As shown, the adhesive layer 60 directly covers the light-emitting element 40 and the anti-reflection layer 50, forming an encapsulation film layer structure of the anti-reflection layer 50 + adhesive layer 60 + encapsulation layer 70 encapsulating the light-emitting element 40. The anti-reflection layer 50 can reduce the reflection of ambient light and protect the front light-emitting side of the display panel 200.

[0044] Optionally, along the thickness direction of the display panel 200 , the thickness of the anti-reflection layer 50 is smaller than the thickness of the light emitting element 40 .

[0045] Exemplarily, the thickness of the anti-reflection layer 50 is in the range of 2 μm to 10 μm, which does not exceed the chip height of the light-emitting element 40 , and avoids blocking the display image light while reducing the reflectivity of the ambient light.

[0046] Figure 4 yes Figure 1 FIG. 5 is a schematic cross-sectional view of another display panel along the AA′ direction.

[0047] Based on the above embodiments, Figure 4 As shown, the display panel 200 further includes a transparent layer 80 , which covers the light emitting element 40 and the anti-reflection layer 50 ; and the adhesive layer 60 covers the transparent layer 80 .

[0048] For example, Figure 4 As shown, the transparent layer 80 may be made of transparent ink with a thickness in the range of 20 μm to 50 μm, which can protect the entire display screen.

[0049] Based on the above embodiments, Figure 4 As shown, the refractive index n1 of the encapsulation layer 70 is greater than n2 of the adhesive layer 60 , and the refractive index n2 of the adhesive layer 60 is greater than the refractive index n3 of the transparent layer 80 .

[0050] Specifically, such as Figure 4As shown, setting n1>n2>n3 is beneficial to reducing the reflection of external light S1, focusing the image light S2 emitted by the light-emitting element 40 toward the positive viewing angle (Z direction in the figure), and improving the light output brightness and display effect of the display panel.

[0051] Figure 5 yes Figure 1 A schematic cross-sectional view of another display panel along the AA' direction; Figure 6 Schematic diagram of the structures of two phase change particles provided in embodiments of the present invention.

[0052] Based on the above embodiments, Figure 5 and Figure 6 As shown, the phase change particles 62 include first phase change particles 621 and second phase change particles 622; the core diameter of the first phase change particle 621 is D1, and the shell thickness is H1; the core diameter of the second phase change particle 622 is D2, and the shell thickness is H2; wherein, D1≠D2, and / or, H1≠H2.

[0053] Specifically, refer to Figure 5 and Figure 6 As shown, the adhesive layer 60 can be provided with phase-change ions of various sizes to achieve both phase-change cooling and light scattering at different temperatures. Taking the first phase-change particles 621 and the second phase-change particles 622 as an example, in some embodiments, D1≠D2 and H1=H2; in some embodiments, D1=D2 and H1≠H2; and in some embodiments, D1≠D2 and H1≠H2.

[0054] Among them, the core materials of the first phase change particle 621 and the second phase change particle 622 can be the same or different; the shell materials of the first phase change particle 621 and the second phase change particle 622 can be the same or different; the first phase change particle 621 and the second phase change particle 622 have different phase change cooling capabilities at different temperatures.

[0055] In some embodiments, reference Figure 5 and Figure 6 As shown, set D1>D2; or, H1>H2.

[0056] Specifically, when it is necessary to enhance the phase change heat dissipation of the phase change particles, the diameter D1 of the core of the first phase change particle 621 can be set to be larger than the diameter D1 of the core of the second phase change particle 622; when it is necessary to enhance the scattering of light by the phase change particles, the thickness H1 of the shell of the first phase change particle 621 can be set to be larger than the thickness H2 of the shell of the second phase change particle 622, so as to take into account both the phase change cooling and light scattering functions at different temperatures.

[0057] In some embodiments, it is set that (D1-D2)×(H1-H2)>0.

[0058] Specifically, the diameter of the core of the first phase change particle 621 is larger than the diameter of the core of the second phase change particle 622, and the thickness of the shell of the first phase change particle 621 is larger than the thickness of the shell of the second phase change particle 622, thereby enhancing the phase change cooling and light scattering capabilities of the first phase change particle 621.

[0059] In some embodiments, reference Figure 5 and Figure 6 As shown, it is set that (D1-D2)×(H1-H2)<0.

[0060] On the basis of the above embodiment, continue to refer to Figure 2-Figure 5 As shown, the material of the encapsulation layer 70 includes a PET film and an anti-reflection coating.

[0061] For details, please refer to Figure 2 、 Figure 4 and Figure 5 As shown, the materials of the encapsulation layer 70 include PET film and anti-reflection coating, wherein the anti-reflection coating may include one or more layers of film structure with a gradient refractive index, which can reduce the reflectivity and glossiness of the display panel 200 to external ambient light.

[0062] Based on the same inventive concept, an embodiment of the present invention further provides a method for manufacturing a display panel. Figure 7 Schematic diagram of a method for manufacturing a display panel provided by an embodiment of the present invention. Figure 2 、 Figure 4 、 Figure 5 and Figure 7 As shown, the display panel 200 further includes a flexible circuit board 90, which is located on a side of the base substrate 20 away from the light emitting element 40. An embodiment of the present invention also provides a method for manufacturing a display panel, including:

[0063] An embodiment of the present invention further provides a method for manufacturing a display panel, comprising:

[0064] S101, providing a substrate.

[0065] Exemplarily, a flexible substrate 20 or a rigid substrate 20 is provided, and a pixel circuit layer 30 is prepared on one side of the substrate 20 .

[0066] S102, preparing a light-emitting element on one side of the base substrate.

[0067] Exemplarily, the light emitting element 40 is transferred to a side of the pixel circuit layer 30 away from the base substrate 20 , and the thin film transistor in the pixel circuit layer 30 is electrically connected to the anode of the light emitting element 40 .

[0068] S103 , preparing an anti-reflection layer on one side of the substrate, wherein the anti-reflection layer at least partially surrounds the light-emitting element.

[0069] Exemplarily, the anti-reflection layer 50 is formed in the peripheral area of ​​the light emitting element 40 .

[0070] S104 , preparing an adhesive layer on the side of the light emitting element facing away from the base substrate.

[0071] For example, Figure 2 For example, an adhesive layer 60 is prepared on the surface of the light-emitting element 40 and the anti-reflection layer 50, and the adhesive layer 60 covers the light-emitting element 40 and the anti-reflection layer 50 in the orthographic projection of the base substrate 20; the adhesive layer 60 includes a base 61 and phase change particles 62; the phase change particles 62 are a core-shell structure, the core is a phase change material, and the shell is a scattering material.

[0072] S105 , preparing an encapsulation layer on the side of the adhesive layer facing away from the substrate.

[0073] S106 , binding a flexible circuit board to a side of the base substrate facing away from the light emitting element.

[0074] Specifically, the preparation method of the display panel provided in the embodiment of the present application, by setting an adhesive layer 60 with a core-shell structure on the light-emitting side of the light-emitting element 40, takes into account both phase change cooling and light scattering functions, and performs phase change cooling during the process of binding the flexible circuit board 90, thereby improving the problem of indentation on the front of the display panel 200 and improving the display effect of the display panel.

[0075] In other embodiments, reference Figure 4 and Figure 5 As shown, before step S104, the preparation method further includes:

[0076] A transparent layer 80 is formed on the surfaces of the light emitting element 40 and the anti-reflection layer 50 , and the surface of the transparent layer 80 is covered with an adhesive layer 60 .

[0077] Specifically, the transparent layer 80 is used to encapsulate and protect the entire display screen.

[0078] Based on the same inventive concept, an embodiment of the present invention further provides a display device. Figure 8 A schematic structural diagram of a display device provided by an embodiment of the present invention is shown in FIG. Figure 8 As shown, the display device includes any one of the display panels provided in the above embodiments. Figure 8 As shown, the display device 300 includes a display panel 200. Therefore, the display device also has the beneficial effects of the display panel in the above embodiment. The similarities can be understood by referring to the above explanation of the display panel, which will not be repeated below.

[0079] The display device 300 provided by the embodiment of the present invention can be Figure 8 The mobile phone shown can also be any electronic product with a display function, including but not limited to the following categories: televisions, laptops, desktop monitors, tablet computers, digital cameras, smart bracelets, smart glasses, car displays, industrial control equipment, medical display screens, touch interactive terminals, etc. The embodiments of the present invention do not specifically limit this.

[0080] Note that the above are only preferred embodiments of the present invention and the technical principles employed. Those skilled in the art will understand that the present invention is not limited to the specific embodiments described herein, and that various obvious changes, readjustments, and substitutions can be made by those skilled in the art without departing from the scope of protection of the present invention. Therefore, although the present invention has been described in detail through the above embodiments, the present invention is not limited to the above embodiments and may include many other equivalent embodiments without departing from the concept of the present invention. The scope of the present invention is determined by the scope of the appended claims.

Claims

1. A display panel, characterized in that: include: substrate; A light emitting element is located on one side of the base substrate; an anti-reflection layer at least partially surrounding the light-emitting element; an adhesive layer, located on a side of the light-emitting element facing away from the base substrate, and covering the light-emitting element and the anti-reflection layer in an orthographic projection of the base substrate; the adhesive layer comprises a base and phase-change particles; the phase-change particles are of a core-shell structure, wherein the core is a phase-change material and the shell is a scattering material; The encapsulation layer covers the adhesive layer.

2. The display panel according to claim 1, wherein: The adhesive layer covers the light emitting element and the anti-reflection layer.

3. The display panel according to claim 1, wherein: Also includes a transparent layer; The transparent layer covers the light emitting element and the anti-reflection layer; The adhesive layer covers the transparent layer.

4. The display panel according to claim 3, wherein: The refractive index of the encapsulation layer is greater than that of the adhesive layer, and the refractive index of the adhesive layer is greater than that of the transparent layer.

5. The display panel according to claim 1, wherein: The phase-change particles include first phase-change particles and second phase-change particles; The diameter of the core of the first phase-change particle is D1, and the thickness of the shell is H1; the diameter of the core of the second phase-change particle is D2, and the thickness of the shell is H2; Among them, D1≠D2, and / or, H1≠H2.

6. The display panel according to claim 5, wherein: D1>D2; or, H1>H2.

7. The display panel according to claim 5, wherein: (D1-D2)×(H1-H2)>0.

8. The display panel according to claim 5, wherein: (D1-D2)×(H1-H2)<0.

9. The display panel according to claim 1, wherein: Along the thickness direction of the display panel, the thickness of the anti-reflection layer is smaller than the thickness of the light emitting element.

10. The display panel according to claim 1, wherein The materials of the encapsulation layer include PET film and anti-reflection coating.

11. A method for preparing a display panel, for preparing the display panel according to any one of claims 1 to 10, characterized in that: The display panel further includes a flexible circuit board, and the flexible circuit board is located on a side of the base substrate away from the light emitting element; The preparation method comprises: providing a substrate; preparing a light-emitting element on one side of the base substrate; An anti-reflection layer is formed on one side of the substrate; the anti-reflection layer at least partially surrounds the light-emitting element; An adhesive layer is prepared on the side of the light-emitting element facing away from the base substrate; the adhesive layer covers the light-emitting element and the anti-reflection layer in the orthographic projection of the base substrate; the adhesive layer includes a base and phase change particles; the phase change particles are a core-shell structure, the core is a phase change material, and the shell is a scattering material; preparing an encapsulation layer on a side of the adhesive layer facing away from the substrate; The flexible circuit board is bound to a side of the base substrate facing away from the light emitting element.

12. A display device, characterized in that: The display panel comprises the display panel according to any one of claims 1 to 10.

Images