Display panel packaging structure and display device

Abstract

The utility model discloses a display panel packaging structure and a display device. The display panel packaging structure comprises a substrate, a display device layer and a packaging layer, the display device layer is arranged on the surface of one side of the substrate; the orthographic projection of the display device layer on the horizontal plane covers the orthographic projection of part of the substrate on the horizontal plane; the packaging layer is arranged on the side, away from the substrate, of the display device layer; wherein the encapsulation layer comprises a first inorganic layer, a light extraction layer and a second inorganic layer which are stacked, and the light extraction layer comprises light extraction particles; the first inorganic layer surrounds the display device layer, the second inorganic layer surrounds the first inorganic layer, and the light extraction layer is arranged between the first inorganic layer and the second inorganic layer. According to the technical scheme of the embodiment of the utility model, the light extraction performance of the display panel can be further improved.

Description

Technical Field

[0001] The utility model relates to the field of display technology, and in particular to a display panel packaging structure and a display device. Background Art

[0002] Organic Light-Emitting Diode (OLED) has the advantages of low power consumption, wide viewing angle and fast response speed, and is widely used in portable electronic devices, wearable electronic devices and automotive electronic devices.

[0003] Because the organic materials in OLED devices are susceptible to chemical reactions with water molecules and oxygen, disrupting the molecular chains and affecting carrier transfer efficiency, photoelectric conversion efficiency, and the lifespan of the OLED device, OLED devices require good packaging. Furthermore, current mainstream OLED displays are increasingly demanding high brightness. Microlens array (MLA) technology is often used in existing OLED devices to improve light extraction. Figure 1 This is a schematic diagram of the cross-sectional structure of an OLED device provided by the prior art. Figure 1 As shown, the MLA structure 01 is disposed on a surface of the encapsulation layer 02 that is away from the light-emitting layer. However, the MLA technology has limited effect on improving the light extraction performance of OLED devices. Utility Model Content

[0004] The utility model provides a display panel packaging structure and a display device, so as to further improve the light extraction performance of the display panel.

[0005] According to one aspect of the present invention, a display panel packaging structure is provided, comprising:

[0006] substrate;

[0007] A display device layer, the display device layer being disposed on one side surface of the substrate; an orthographic projection of the display device layer on a horizontal plane partially covering an orthographic projection of the substrate on the horizontal plane;

[0008] an encapsulation layer, the encapsulation layer being disposed on a side of the display device layer away from the substrate;

[0009] The encapsulation layer includes a first inorganic layer, a light extraction layer, and a second inorganic layer that are stacked, and the light extraction layer includes light extraction particles;

[0010] The first inorganic layer is disposed to surround the display device layer, the second inorganic layer is disposed to surround the first inorganic layer, and the light extraction layer is disposed between the first inorganic layer and the second inorganic layer.

[0011] Optionally, the light extraction layer has a thickness greater than or equal to 5 μm.

[0012] Optionally, the light extraction particles include raspberry-shaped particles;

[0013] The raspberry-shaped particles include a core particle and a plurality of shell particles, wherein the diameter of the core particle is larger than the diameter of the shell particle;

[0014] A plurality of shell particles are disposed around the periphery of the core particle.

[0015] Optionally, the diameter of the raspberry-shaped particles ranges from less than 1 μm.

[0016] Optionally, the composite type of the raspberry-shaped particles includes any one of an inorganic / organic composite type, an inorganic / inorganic composite type and an organic / organic composite type.

[0017] Optionally, the core particles include an inorganic material or an organic polymer material, and the shell particles include an inorganic material or an organic polymer material.

[0018] Optionally, the encapsulation layer further comprises: an organic layer;

[0019] The organic layer is disposed between the light extraction layer and the first inorganic layer;

[0020] Alternatively, the organic layer is disposed between the light extraction layer and the second inorganic layer.

[0021] Optionally, an edge of the first inorganic layer, an edge of the organic layer, and an edge of the light extraction layer form a step structure.

[0022] Optionally, the display device layer includes a driving electrode layer and a light-emitting layer that are stacked;

[0023] The orthographic projection of the driving electrode layer on the horizontal plane covers the orthographic projection of the light-emitting layer on the horizontal plane, and the orthographic projections of the driving electrode layer and the light-emitting layer on the horizontal plane partially cover the orthographic projection of the substrate on the horizontal plane.

[0024] According to another aspect of the present invention, a display device is provided, comprising the display panel packaging structure according to any embodiment of the first aspect.

[0025] The display panel packaging structure provided by the embodiment of the present invention comprises a first inorganic layer, a light extraction layer, and a second inorganic layer stacked in layers. The first inorganic layer surrounds the display device layer, a light extraction layer is provided on the surface of the first inorganic layer, and a second inorganic layer is provided on the side of the light extraction layer away from the substrate, thereby forming an encapsulation layer to completely surround the display device layer, so that the display panel has a good packaging effect and prevents the organic material in the light-emitting layer from being destroyed by water and oxygen. The light extraction layer in the encapsulation layer contains light extraction particles with a certain high refractive index. Since the light extraction particles have a larger specific surface area and a larger number than the microlens array of the related art, they can effectively improve the light extraction efficiency of the display panel, which is conducive to achieving a high-brightness display effect of the display panel.

[0026] It should be understood that the content described in this section is not intended to identify the key or important features of the embodiments of the present invention, nor is it intended to limit the scope of the present invention. Other features of the present invention will become easily understood through the following description. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the following briefly introduces the drawings required for use in the description of the embodiments. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0028] Figure 1 This is a schematic diagram of the cross-sectional structure of an OLED device provided by the prior art;

[0029] Figure 2 This is a schematic cross-sectional view of a display panel packaging structure provided according to an embodiment of the present invention;

[0030] Figure 3 This is a schematic diagram of the cross-sectional structure of a raspberry-shaped particle provided according to an embodiment of the present utility model;

[0031] Figure 4 is a schematic cross-sectional view of another display panel packaging structure provided according to an embodiment of the present utility model;

[0032] Figure 5 is a schematic cross-sectional view of another display panel packaging structure provided according to an embodiment of the present utility model;

[0033] Figure 6 is a schematic cross-sectional view of another display panel packaging structure provided according to an embodiment of the present utility model;

[0034] Figure 7It is a structural schematic diagram of a display device provided according to an embodiment of the present utility model. DETAILED DESCRIPTION

[0035] In order to help those skilled in the art better understand the present invention, the following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the embodiments described are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts should fall within the scope of protection of the present invention.

[0036] It should be noted that the terms "first", "second", etc. in the specification and claims of the present invention and the above-mentioned drawings are used to distinguish similar objects and are not necessarily used to describe a specific order or sequence. It should be understood that the numbers used in this way can be interchanged where appropriate, so that the embodiments of the present invention described herein can be implemented in an order other than those illustrated or described herein. In addition, the terms "including" and "having" and any variations thereof are intended to cover non-exclusive inclusions. For example, a process, method, system, product or device that includes a series of steps or units is not necessarily limited to those steps or units clearly listed, but may include other steps or units that are not clearly listed or inherent to these processes, methods, products or devices.

[0037] An embodiment of the utility model provides a display panel packaging structure. Figure 2 This is a schematic cross-sectional view of a display panel packaging structure provided by an embodiment of the present invention. Figure 2 As shown, the display panel packaging structure includes: a substrate 10 , a display device layer 20 and a packaging layer 30 .

[0038] The display device layer 20 is disposed on one side of the substrate 10 ; the orthographic projection of the display device layer 20 on the horizontal plane partially covers the orthographic projection of the substrate 10 on the horizontal plane; the encapsulation layer 30 is disposed on the side of the display device layer 20 away from the substrate 10 .

[0039] Among them, the encapsulation layer 30 includes a first inorganic layer 31, a light extraction layer 32 and a second inorganic layer 33 arranged in a stacked manner, and the light extraction layer 32 includes light extraction particles; the first inorganic layer 31 is arranged to surround the display device layer 20, the second inorganic layer 33 is arranged to surround the first inorganic layer 31, and the light extraction layer 32 is arranged between the first inorganic layer 31 and the second inorganic layer 33.

[0040] Exemplarily, the display device layer 20 includes a driving electrode layer 21 and a light-emitting layer 22 that are stacked. The orthographic projection of the driving electrode layer 21 on the horizontal plane covers the orthographic projection of the light-emitting layer 22 on the horizontal plane. Preferably, the orthographic projection of the driving electrode layer 21 on the horizontal plane may be slightly larger than the orthographic projection of the light-emitting layer 22 on the horizontal plane. Figure 2 The structural features of the display panel packaging structure are only schematically shown, and it is not shown that the orthographic projection of the driving electrode layer 21 on the horizontal plane can be slightly larger than the orthographic projection of the light-emitting layer 22 on the horizontal plane. The orthographic projections of the driving electrode layer 21 and the light-emitting layer 22 on the horizontal plane cover part of the orthographic projection of the substrate 10 on the horizontal plane. The area of ​​the driving electrode layer 21 and the light-emitting layer 22 is smaller than the area of ​​the substrate 10 and is located at the center of the substrate 10. Therefore, the edges of the driving electrode layer 21 and the light-emitting layer 22 form a step shape with the edge of the substrate 10. In the packaging layer 30 provided on the surface of the display device layer 20 away from the substrate 10, the first inorganic layer 31 completely covers the surface and side surfaces of the display device layer 20, and the side surfaces of the second inorganic layer 33 cover the surface edges and side surfaces of the first inorganic layer 31, so that the driving electrode layer 21 and the light-emitting layer 22 are completely wrapped inside, so that the display panel has a good packaging effect and prevents the organic material in the light-emitting layer 22 from being destroyed by water and oxygen.

[0041] A light extraction layer 32 is provided on the surface of the first inorganic layer 31. A second inorganic layer 33 covers the surface and sides of the light extraction layer 32, and also covers the sides and surface edges of the first inorganic layer 31. In other words, the second inorganic layer 33 completely covers the light extraction layer 32 and the first inorganic layer 31, forming an encapsulation layer 30 with excellent encapsulation effect. The light extraction layer 32 in the encapsulation layer 30 contains light extraction particles with a certain high refractive index. The light extraction layer 32 is formed by dissolving the light extraction particles in an organic solution to form a light extraction particle liquid, coating the light extraction particle liquid on the corresponding film layer, and curing it by heating to obtain a surface micro-nanostructured coating. For example, to protect the organic material in the light-emitting layer 22 and other film layers from high temperatures, the curing temperature can be set to less than 90°C. Compared to microlens arrays in related technologies, light extraction particles have a larger specific surface area, and the light extraction layer 32 contains a large number of light extraction particles, which helps improve light extraction efficiency. Using the light extraction layer 32 as one of the encapsulation layers 30 can prevent the total thickness of the display panel encapsulation structure from increasing too much, and can effectively improve the light extraction efficiency of the display panel, thereby facilitating high-brightness display effects of the display panel.

[0042] The display panel packaging structure provided by the embodiment of the present invention comprises a first inorganic layer, a light extraction layer, and a second inorganic layer stacked in layers. The first inorganic layer surrounds the display device layer. A light extraction layer is provided on the surface of the first inorganic layer, and a second inorganic layer is provided on the side of the light extraction layer away from the substrate, thereby forming an encapsulation layer to completely surround the display device layer. This allows the display panel to have a good packaging effect and prevents the organic material in the light-emitting layer from being destroyed by water and oxygen. The light extraction layer in the encapsulation layer contains light extraction particles with a certain high refractive index. Compared with the microlens array of the related art, the light extraction particles have a larger specific surface area and are numerous, thereby effectively improving the light extraction efficiency of the display panel, which is conducive to achieving a high-brightness display effect of the display panel.

[0043] Optionally, based on the above embodiment, the thickness of the light extraction layer 32 ranges from greater than or equal to 5 μm.

[0044] For example, setting the thickness of the light extraction layer 32 to be greater than or equal to 5 μm ensures that the encapsulation layer 30 has a certain thickness. When a crack appears in a layer of the encapsulation layer 30, moisture and oxygen from the outside air are transmitted along the crack, which increases the water and oxygen transmission path. This effectively improves the water and oxygen barrier capability of the display panel encapsulation structure, protecting the light-emitting layer 22 from damage by external moisture and oxygen. If the light extraction layer 32 is too thick, the display panel encapsulation structure will be too thick, which may affect the reliability of the display panel.

[0045] Optionally, Figure 3 This is a schematic diagram of the cross-sectional structure of a raspberry-shaped particle provided by an embodiment of the present utility model. Figure 4 This is a cross-sectional structural diagram of another display panel packaging structure provided by the embodiment of the present invention. Figure 3 and Figure 4 , the light extraction particles include raspberry-shaped particles 321.

[0046] The raspberry-shaped particle 321 includes a core particle 322 and a plurality of shell particles 323 . The diameter of the core particle 322 is larger than that of the shell particles 323 . The plurality of shell particles 323 are disposed around the periphery of the core particle 322 .

[0047] Exemplarily, the light extraction particles can be raspberry-shaped particles 321 with a large specific surface area and high surface roughness, resembling a raspberry. Specifically, the raspberry-shaped particles 321 include a core particle 322 and a shell particle 323. The core particle 322, which has a larger diameter, is located at the center of the raspberry-shaped particle 321, while the shell particles 323, which have a smaller diameter, are located on the periphery of the core particle 322. Multiple shell particles 323 surround the core particle 322. Due to the unique shape of the raspberry-shaped particles 321, they have a high refractive index. Thus, coating the raspberry-shaped particles 321 on the surface of the first inorganic layer 31 in the encapsulation layer 30 to form the light extraction layer 32 can effectively improve the light extraction performance of the display panel. Exemplarily, the diameter of the raspberry-shaped particles 321 ranges from less than 1 μm. By controlling different reaction conditions, raspberry-shaped particles 321 with smaller particle sizes can be prepared, resulting in raspberry-shaped particles 321 with a larger specific surface area, which helps increase the particle reaction rate and loading capacity, thereby further improving the light extraction performance of the display panel. Among them, the synthesis methods of raspberry-shaped particles 321 may include polymerization, self-assembly, particle surface-directed hydrolysis and biomimetic precipitation; polymerization methods may include emulsion polymerization, miniemulsion polymerization, dispersion polymerization, soap-free emulsion polymerization and solid particle stabilized emulsion (Pickering emulsion) polymerization; self-assembly methods may include electrostatic interaction, hydrogen bonding, chemical bond interaction and acid-base interaction.

[0048] Optionally, based on the above embodiments, continue to refer to Figure 3 The composite type of the raspberry-shaped particles 321 includes any one of an inorganic / organic composite type, an inorganic / inorganic composite type, and an organic / organic composite type. The core particles 322 include an inorganic material or an organic polymer material, and the shell particles 323 include an inorganic material or an organic polymer material.

[0049] Exemplarily, the core particles 322 can be made of inorganic materials or organic polymer materials; the shell particles 323 can be made of inorganic materials or organic polymer materials. The materials used for the core particles 322 and the shell particles 323 can be freely combined to form three types of raspberry-shaped particles 321: inorganic / organic composite type, inorganic / inorganic composite type, and organic / organic composite type. In this embodiment, any one of the three types of raspberry-shaped particles 321 can be selected, and all of them can play a role in improving the light extraction performance of the display panel, without limitation. In terms of material selection, the inorganic material can include at least one material selected from silicon nitride, aluminum nitride, zirconium nitride, titanium nitride, hafnium nitride, tantalum nitride, silicon oxide, aluminum oxide, titanium oxide, tin oxide, cerium oxide, silicon carbide, and silicon oxynitride; the organic polymer material can include at least one organic polymer selected from polystyrene, polymethyl methacrylate, epoxy resin, acrolein resin, and polyimide resin, without limitation.

[0050] Optionally, Figure 5 This is a schematic cross-sectional view of another display panel packaging structure provided by an embodiment of the present invention. Figure 6 This is a cross-sectional structural diagram of another display panel packaging structure provided by the embodiment of the present invention. Figure 5 and Figure 6 The encapsulation layer 30 further includes: an organic layer 34 .

[0051] The organic layer 34 is disposed between the light extraction layer 32 and the first inorganic layer 31 ; alternatively, the organic layer 34 is disposed between the light extraction layer 32 and the second inorganic layer 33 .

[0052] For example, an organic layer 34 may be further provided in the encapsulation layer 30 provided with the light extraction layer 32. Figure 5 As shown, the encapsulation layer 30 may include a first inorganic layer 31, an organic layer 34, a light extraction layer 32, and a second inorganic layer 33 that are stacked. Figure 6 As shown, the encapsulation layer 30 may also include a stacked first inorganic layer 31, a light extraction layer 32, an organic layer 34, and a second inorganic layer 33. By adding an organic layer 34 to the encapsulation layer 30, the number of film layers in the encapsulation layer 30 can be increased, extending the transmission path for external water and oxygen. Therefore, if a film layer of the encapsulation layer 30 is cracked or damaged, the transmission of water and oxygen along the crack path can be slowed, slowing the transmission of water and oxygen to the light-emitting layer 22. Furthermore, the light extraction particles in the light extraction layer 32 are hydrophobic, further improving the water and oxygen barrier capability of the display panel encapsulation structure.

[0053] Optionally, based on the above embodiments, continue to refer to Figure 5 and Figure 6 , an edge of the first inorganic layer 31 , an edge of the organic layer 34 , and an edge of the light extraction layer 32 form a step structure.

[0054] For example, by stacking an organic layer 34 and a light extraction layer 32 with gradually decreasing areas on the surface of the first inorganic layer 31, a step structure is formed at the edges of the first inorganic layer 31, the organic layer 34 and the light extraction layer 32, so that the second inorganic layer 33 can completely cover the sides and surfaces of each film layer in the encapsulation layer 30, reducing the gaps in contact with external water and oxygen, which is beneficial to improving the water and oxygen blocking ability of the display panel encapsulation structure.

[0055] An embodiment of the present utility model further provides a display device. Figure 7 This is a schematic diagram of the structure of a display device provided by an embodiment of the present utility model. Figure 7As shown, the display device includes the display panel packaging structure provided by any of the above embodiments, and the display panel can be a mobile phone panel, etc. The packaging layer in the display panel packaging structure includes a first inorganic layer, a light extraction layer, and a second inorganic layer arranged in a stacked manner. The packaging layer completely surrounds the display device layer, so that the display panel has a good packaging effect and prevents the organic material in the light-emitting layer from being destroyed by water and oxygen. The light extraction layer contains light extraction particles with a high refractive index. By arranging a large number of light extraction particles with a large specific surface area in the packaging layer, the light extraction efficiency of the display panel can be effectively improved, which is conducive to achieving a high-brightness display effect of the display panel.

[0056] The above specific embodiments do not limit the scope of protection of this utility model. Those skilled in the art will appreciate that various modifications, combinations, sub-combinations, and substitutions may be made based on design requirements and other factors. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of this utility model shall be included within the scope of protection of this utility model.

Claims

1. A display panel packaging structure, characterized in that: include: substrate; a display device layer, the display device layer being disposed on one side surface of the substrate; The orthographic projection of the display device layer on the horizontal plane covers a portion of the orthographic projection of the substrate on the horizontal plane; an encapsulation layer, the encapsulation layer being disposed on a side of the display device layer away from the substrate; The encapsulation layer includes a first inorganic layer, a light extraction layer, and a second inorganic layer that are stacked, and the light extraction layer includes light extraction particles; The first inorganic layer is disposed to surround the display device layer, the second inorganic layer is disposed to surround the first inorganic layer, and the light extraction layer is disposed between the first inorganic layer and the second inorganic layer.

2. The display panel packaging structure according to claim 1, wherein: The light extraction layer has a thickness greater than or equal to 5 μm.

3. The display panel packaging structure according to claim 1, wherein: The encapsulation layer further includes: an organic layer; The organic layer is disposed between the light extraction layer and the first inorganic layer; Alternatively, the organic layer is disposed between the light extraction layer and the second inorganic layer.

4. The display panel packaging structure according to claim 3, wherein: An edge of the first inorganic layer, an edge of the organic layer, and an edge of the light extraction layer form a stepped structure.

5. The display panel packaging structure according to claim 1, wherein: The display device layer includes a driving electrode layer and a light-emitting layer that are stacked; The orthographic projection of the driving electrode layer on the horizontal plane covers the orthographic projection of the light-emitting layer on the horizontal plane, and the orthographic projections of the driving electrode layer and the light-emitting layer on the horizontal plane partially cover the orthographic projection of the substrate on the horizontal plane.

6. A display device, characterized in that: The display panel packaging structure comprises the display panel packaging structure as described in any one of claims 1 to 5.

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