Display panel and display device

Abstract

The invention discloses a display panel and a display device. The display panel comprises a substrate; the pixel definition layer is arranged on one side of the substrate, and a first opening is formed in the pixel definition layer; the light-emitting element is arranged in the first opening, and the pixel definition layer is provided with a groove located in the periphery of the first opening part; the reflection structure is arranged on at least part of the periphery of the first opening and used for reflecting the light which is emitted by the light-emitting element and enters the groove to be emitted out from the light-emitting surface of the display panel. The display panel provided by the invention can improve the light extraction efficiency.

Description

Technical Field

[0001] This application relates to the field of display technology, and in particular to a display panel and a display device. Background Technology

[0002] In recent years, with the development and widespread adoption of display technology, display panels have been applied to various electronic devices, such as mobile phones, tablets, or other portable electronic devices.

[0003] However, the inventors of this application have discovered that the light extraction efficiency of current display panels still needs to be further improved. Summary of the Invention

[0004] This application provides a display panel and a display device that can improve the light extraction efficiency of the display panel.

[0005] A first aspect of this application provides a display panel, the display panel comprising: a substrate; a pixel definition layer disposed on one side of the substrate, the pixel definition layer having a first opening; a light-emitting element disposed in the first opening, the pixel definition layer having a groove located around a portion of the first opening; and a reflective structure disposed around at least a portion of the first opening, for reflecting light emitted by the light-emitting element and entering the groove to be emitted from the light-emitting surface of the display panel.

[0006] A second aspect of this application provides a display panel, the display panel comprising: a substrate; a pixel definition layer disposed on one side of the substrate, the pixel definition layer having a first opening; and a light-emitting element disposed in the first opening, the light-emitting element comprising a first electrode, at least one light-emitting unit, and a second electrode stacked sequentially, the first electrode being a total internal reflection electrode, the second electrode being a light-transmitting electrode, each light-emitting unit comprising a light-emitting material layer and a first charge transport layer located between the first electrode and the light-emitting material layer, wherein the refractive index of the first charge transport layer is in the range of 1.7 to 2.0.

[0007] A third aspect of this application provides a display device including the display panel described above.

[0008] The beneficial effects are as follows: The display panel of this application has a groove around the first opening of the pixel definition layer. The groove allows the light emitted by the light-emitting element and coupled into the waveguide mode to leak out from the side of the light-emitting element. At the same time, the reflective structure reflects the light leaking out from the side of the light-emitting element and makes this part of the light exit from the light-emitting surface of the display panel. In this way, the light of the waveguide mode leaking from the side of the light-emitting element can be converted into forward-radiated light, thereby improving the light extraction efficiency of the display panel. Attached Figure Description

[0009] To more clearly illustrate the technical solutions in the embodiments of this application, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort, wherein:

[0010] Figure 1 This is a schematic diagram of the structure of one embodiment of the display panel of this application;

[0011] Figure 2 This is a schematic diagram of another embodiment of the display panel of this application;

[0012] Figure 3 This is a schematic diagram of another embodiment of the display panel of this application;

[0013] Figure 4 yes Figure 1 A schematic diagram showing the relative positions of the first opening and the groove.

[0014] Figure 5 This is a schematic diagram of another embodiment of the display panel of this application;

[0015] Figure 6 This is a schematic diagram of another embodiment of the display panel of this application;

[0016] Figure 7 This is a schematic diagram of another embodiment of the display panel of this application;

[0017] Figure 8 yes Figure 1 A schematic diagram of the structure of the light-emitting element in one embodiment;

[0018] Figure 9 yes Figure 1 A schematic diagram of the structure of the light-emitting element in another embodiment;

[0019] Figure 10 yes Figure 1 A schematic diagram of the structure of the light-emitting element in another embodiment;

[0020] Figure 11 yes Figure 1 A schematic diagram of the structure of the light-emitting element in another embodiment;

[0021] Figure 12 yes Figure 1 A schematic diagram of the structure of the light-emitting element in another embodiment;

[0022] Figure 13 yes Figure 1 A schematic diagram of the structure of the light-emitting element in another embodiment;

[0023] Figure 14 yes Figure 1 A schematic diagram of the isolation structure in one embodiment. Detailed Implementation

[0024] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of this application, and not all of the embodiments. Based on the embodiments of this application, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of this application.

[0025] It should be noted that the terms "first" and "second" in this application are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Therefore, a feature defined as "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this application, "multiple" means at least two, such as two, three, etc., unless otherwise explicitly specified. Furthermore, the terms "comprising" and "having," and any variations thereof, are intended to cover non-exclusive inclusion. For example, a process, method, system, product, or apparatus that includes a series of steps or units is not limited to the listed steps or units, but may optionally include steps or units not listed, or may optionally include other steps or units inherent to these processes, methods, products, or apparatuses.

[0026] See Figure 1 , Figure 1 This is a schematic diagram of the structure of one embodiment of the display panel of this application. The display panel 100 includes a substrate 110, a pixel definition layer 120, a light-emitting element 130, and a reflective structure 140.

[0027] The substrate 110 serves a supporting function in the display panel 100. It can be a flexible substrate or a rigid substrate. When the substrate 110 is a flexible substrate, its material can be polyimide (PI), or it can be a multilayer structure with alternating organic and inorganic layers. For example, the substrate 110 includes inorganic layers, organic layers, and inorganic layers stacked sequentially. In this case, the multilayer structure with alternating organic and inorganic layers can balance the flexibility and strength of the substrate 110, giving the display panel 100 a bendable function and resistance to breakage and deformation. When the substrate 110 is a rigid substrate, its material can be glass or metal. This application does not limit the structure of the substrate 110.

[0028] A pixel defining layer 120 is disposed on one side of the substrate 110 and has a first opening 121, in which a light-emitting element 130 is disposed. Specifically, the pixel defining layer 120 is used to define the light-emitting element 130 and to prevent light emitted by adjacent light-emitting elements 130 from interfering with each other. There can be multiple first openings 121, and each first opening 121 contains a light-emitting element 130. The pixel defining layer 120 can be formed of organic materials such as polyimide (PI), polyamide, benzocyclobutene (BCB), acrylic resin, or phenolic resin, or of inorganic materials such as SiNx. This application does not limit the material of the pixel defining layer 120.

[0029] Continue reading Figure 1 In one embodiment, the pixel definition layer 120 is further provided with a groove 122 located on a portion of the periphery of the first opening 121 (in order not to affect the voltage applied to the light-emitting element 130, the groove 122 is only provided on a portion of the periphery of the first opening 121). The groove 122 is used to receive the side light emitted by the light-emitting element 130. At the same time, the reflective structure 140 is provided on the periphery of the first opening 121 to reflect the light emitted by the light-emitting element 130 and entering the groove 122 to be emitted from the light-emitting surface of the display panel 100.

[0030] Specifically, the groove 122 allows the light emitted by the light-emitting element 130 in the waveguide mode to leak out from the side of the light-emitting element 130. The reflective structure 140 can reflect the light leaking out from the side of the light-emitting element 130 and make this part of the light exit from the light-emitting surface of the display panel 100. Thus, the solution of this application can convert the light in the waveguide mode leaking from the side of the light-emitting element 130 into forward-radiated light, thereby improving the light extraction efficiency of the display panel 100.

[0031] The light-emitting element 130 can be a single-layer device, that is, it only includes one layer of light-emitting material, or it can be a multilayer device, including multiple layers of light-emitting material, as described below.

[0032] Continue reading Figure 1 In one embodiment, the groove 122 is a through-slot that penetrates the pixel definition layer 120, meaning the groove 122 connects two opposing surfaces of the pixel definition layer 120. This allows more side light from the light-emitting element 130 to be introduced into the groove 122, thereby further improving the light extraction efficiency of the display panel 100. Of course, in other embodiments, the groove 122 may not penetrate the pixel definition layer 120, such as... Figure 2 As shown.

[0033] In one embodiment, a reflective layer is formed on the surface of the reflective structure 140 opposite to the substrate 110, and the reflective layer is used to reflect light entering the groove 122. In one embodiment, the material of the reflective layer includes a metal, for example, at least one of silver, aluminum, and titanium;

[0034] In one embodiment, the material of the reflective structure 140 includes metal, that is, the reflective structure 140 is made entirely of metal material, which ensures that it can reflect light entering the groove 122 at various angles, thereby further improving the light extraction efficiency of the display panel 100.

[0035] Continue reading Figure 1 In one embodiment, the reflective structure 140 is disposed between the substrate 110 and the pixel definition layer 120, and the orthographic projection of the reflective structure 140 on the substrate 110 at least partially overlaps with the orthographic projection of the groove 122 on the substrate 110. Specifically, in this embodiment, although the reflective structure 140 is not located in the groove 122, because the orthographic projection of the reflective structure 140 on the substrate 110 at least partially overlaps with the orthographic projection of the groove 122 on the substrate 110, the reflective structure 140 can also reflect light entering the groove 122.

[0036] Continue reading Figure 1 To increase the amount of light reflected by the reflective structure 140, the orthographic projection of the reflective structure 140 on the substrate 110 is arranged to cover the orthographic projection of the groove 122 on the substrate 110. That is, the width of the groove 122 is smaller than the width of the reflective structure 140, so that all light rays incident on the bottom of the groove 122 can be reflected by the reflective structure 140. Of course, in other embodiments, the orthographic projection of the reflective structure 140 on the substrate 110 and the orthographic projection of the groove 122 on the substrate 110 may only partially overlap. In short, it is sufficient to ensure that the reflective structure 140 can reflect the light rays entering the groove 122.

[0037] Continue reading Figure 1 The display panel 100 further includes a connection layer 150 and a driving circuit layer 160.

[0038] The driving circuit layer 160 is located between the substrate 110 and the interconnect layer 150. The driving circuit layer 160 includes a pixel driving circuit, which is used to drive the light-emitting element 130 to emit light. The pixel driving circuit includes structures such as transistors 1611 and storage capacitors 1612. The pixel driving circuit can be, for example, a 2T1C circuit, a 7T1C circuit, a 7T2C circuit, or a 9T1C circuit, and this application does not limit its specific structure. The "2T1C circuit" refers to a pixel circuit that includes two thin-film transistors (T) and one capacitor (C), and so on for "7T1C circuit", "7T2C circuit", "9T1C circuit", etc.

[0039] The connection layer 150 includes a connection trace 151, which electrically connects the light-emitting element 130 to the pixel driving circuit, so that the pixel driving circuit can drive the light-emitting element 130 to emit light.

[0040] In one embodiment, see Figure 1 The reflective structure 140 and the connecting trace 151 are disposed in the same layer and made of the same material. Therefore, during fabrication, the connecting trace 151 and the reflective structure 140 can be fabricated through the same etching process, simplifying the fabrication process and improving fabrication efficiency. In other embodiments, the reflective structure 140 may also be in the same layer as the connecting trace 151 but made of a different material.

[0041] In one embodiment, both the reflective structure 140 and the connecting trace 151 are stacked structures, specifically titanium-aluminum-titanium stacked structures. That is, the reflective structure 140 includes a first titanium layer, an aluminum layer, and a second titanium layer that are sequentially stacked in the direction away from the substrate 110.

[0042] Continue reading Figure 1 The display panel 100 further includes an insulating layer 170, which is located between the substrate 110 and the pixel definition layer 120, specifically between the driving circuit layer 160 and the pixel definition layer 120. A connecting layer 150 is located on the side of the insulating layer 170 facing the substrate 110. The orthographic projection of the insulating layer 170 onto the substrate 110 covers the orthographic projection of the reflective structure 140 onto the substrate 110. This arrangement ensures that the reflective structure 140 is covered by the insulating layer 170, thereby protecting the reflective structure 140 from corrosion by external water, oxygen, or other contaminants.

[0043] It should be noted that, in other embodiments, at least a portion of the reflective structure 140 may also be exposed from the insulating layer 170, i.e., as shown below. Figure 3 As shown, the reflective structure 140 can reflect light better at this time.

[0044] Continue reading Figure 3 In one embodiment, the groove 122 extends through the pixel definition layer 120, and the reflective structure 140 is directly exposed in the groove 122. In this case, during the fabrication process, when the groove 122 is formed on the pixel definition layer 120, the groove 122 can be directly extended onto the reflective structure 140, thereby directly exposing the reflective structure 140 in the groove 122 to better reflect light.

[0045] Specifically, the insulating layer 170 is a planarization layer, which also serves to flatten and eliminate step differences, ensuring the flatness of the display panel 100. The material of the insulating layer 170 can be an organic material, an inorganic material, or a mixture of organic and inorganic materials, and there are no restrictions on this.

[0046] Continue reading Figure 1 and Figure 4 In one embodiment, the groove 122 penetrates the light-emitting element 130 on the side of the pixel definition layer 120 facing away from the substrate 110, and the groove 122 partially surrounds the first opening 121. Specifically, in order to simplify the fabrication process and improve fabrication efficiency, the groove 122 is formed after the fabrication of the light-emitting element 130 is completed. At this time, the groove 122 will penetrate the light-emitting element 130 located above the pixel definition layer 120. At the same time, without affecting the application of voltage to the light-emitting element 130, the groove 122 is also provided to partially surround the first opening 121, that is, the groove 122 will not completely surround the first opening 121. On the side facing away from the substrate 110, the light-emitting element 130 can still be electrically connected to other traces, conductive structures, etc.

[0047] See Figure 5 ,and Figure 1 In another embodiment, the reflective structure 140 is located in the groove 122 and at the bottom of the groove 122. In this case, the reflective structure 140 can also reflect the light entering the groove 122.

[0048] Continue reading Figure 5 In one embodiment, when the first electrode 131 and the second electrode 133 in the light-emitting element 130 are stacked sequentially in the direction Y away from the substrate 110, the reflective structure 140 is disposed in the same layer as the first electrode 131 and is made of the same material. Thus, during fabrication, the first electrode 131 and the reflective structure 140 can be patterned simultaneously in the same patterning process, thereby improving the fabrication efficiency.

[0049] Of course, in other embodiments, the material of the reflective structure 140 may be different from that of the first electrode 131, or the reflective structure 140 may not be disposed in the same layer as the first electrode 131. In short, as long as the reflective structure 140 can reflect light, it is acceptable.

[0050] Continue reading Figure 6 as well as Figure 7 In order to direct more light leaking into the groove 122 to the bottom of the groove 122 and be reflected by the reflective structure 140, the width of the groove 122 is reduced in the direction Y away from the substrate 110, that is, the groove 122 has a structure that is narrow at the top and wide at the bottom.

[0051] In an application scenario, such as Figure 6 and Figure 7 As shown, in the direction Y away from the substrate 110, the cross-section of the groove 122 is trapezoidal.

[0052] In an application scenario, such as Figure 6 The included angle α formed between the groove wall of the groove 122 and the substrate 110 is in the range of 75° to 85°, for example, α is equal to 75°, 80° or 85°, etc.

[0053] This application does not impose any restrictions on the cross-sectional shape of the reflective structure 140, such as... Figure 1 , Figure 5 as well as Figure 6 As shown, in the direction Y away from the substrate 110, the cross-sectional shape of the reflective structure 140 is trapezoidal. However, in other embodiments, the cross-sectional shape of the reflective structure 140 may also be rectangular (e.g., Figure 2 (as shown), triangles and other shapes.

[0054] In other implementations, such as Figure 1 , Figure 2 and Figure 5 As shown, the cross-section of the groove 122 can also be rectangular. In summary, this application does not limit the cross-sectional shape of the groove 122.

[0055] In one embodiment, the width of the groove 122 ranges from 2 to 5 μm, for example, the width of the groove 122 is 2 μm, 3 μm, 4 μm, or 5 μm. Wherein, combined with Figure 1 The width of the groove 122 mentioned in this application refers to the width of the groove 122 in the X direction.

[0056] In one embodiment, the light-emitting element 130 emits red light, and the width of the groove 122 surrounding the light-emitting element 130 ranges from 3 to 5 μm, for example, 3 μm, 4 μm, or 5 μm; the light-emitting element 130 emits green light, and the width of the groove 122 surrounding the light-emitting element 130 ranges from 2.5 to 5 μm, for example, 2.5 μm, 3 μm, 4 μm, or 5 μm; the light-emitting element 130 emits blue light, and the width of the groove 122 surrounding the light-emitting element 130 ranges from 2 to 5 μm, for example, 2 μm, 3 μm, 4 μm, or 5 μm.

[0057] In one embodiment, there are multiple light-emitting elements 130. The larger the wavelength of the light emitted by the light-emitting element 130, the larger the width of the groove 122 surrounding the first opening 121 corresponding to the light-emitting element 130. This allows the groove 122 to match the wavelength of the light, enabling more light to enter the groove 122. For example, the width of the groove 122 surrounding the red light-emitting element 130 is greater than the width of the groove 122 surrounding the green light-emitting element 130, and the width of the groove 122 surrounding the green light-emitting element 130 is greater than the width of the groove 122 surrounding the blue light-emitting element 130. Of course, in other embodiments, the width of the groove 122 surrounding all the light-emitting elements 130 can be equal, and this is not a limitation.

[0058] It should be noted that the width of the groove 122 mentioned in this application can be the average width of the groove 122, or the maximum or minimum width of the groove 122.

[0059] Continue reading Figure 8 and Figure 9 The light-emitting element 130 includes a first electrode 131, at least one light-emitting unit 132, and a second electrode 133 stacked sequentially. The first electrode 131 is a total internal reflection electrode, and the second electrode 133 is a light-transmitting electrode, meaning that the light emitted by the light-emitting element 130 exits through the second electrode 133. When the light-emitting element 130 is a top-emitting element, such as... Figure 1 As shown, in the direction Y away from the substrate 110, the first electrode 131, at least one light-emitting unit 132 and the second electrode 133 are stacked in sequence. When the light-emitting element 130 is a bottom light-emitting element, in the direction Y away from the substrate 110, the second electrode 133, at least one light-emitting unit 132 and the first electrode 131 are stacked in sequence.

[0060] When the light-emitting element 130 is a single-layer device, such as Figure 8 As shown, the number of light-emitting units 132 is one. When the light-emitting element 130 is a stacked device, as shown... Figure 9 As shown, there are multiple light-emitting units 132, and a charge generation layer 134 is provided between two adjacent light-emitting units 132 to effectively distribute the charge to each light-emitting unit 132. The charge generation layer 134 has a PN junction, which includes an N-type charge generation layer (N-CGL) and a P-type charge generation layer (P-CGL) stacked together.

[0061] Continue reading Figure 8 as well as Figure 9 Each light-emitting unit 132 includes a light-emitting material layer 1321 and a first charge transport layer 1322 located between the first electrode 131 and the light-emitting material layer 1321.

[0062] In one embodiment, the refractive index of the first charge transport layer 1322 is in the range of 1.7 to 2.0, for example, a refractive index of 1.7, 1.8 or 2.0.

[0063] It is understandable that if Figure 8 and Figure 9 As shown, when the first electrode 131 is the anode, the first charge transport layer 1322 is the hole transport layer (HTL), as... Figure 10 and Figure 11 As shown, when the first electrode 131 is the cathode, the first charge transport layer 1322 is the electron transport layer (ETL).

[0064] In one implementation, such as Figure 8 and Figure 9 As shown, the first electrode 131 is the anode, and the first charge transport layer 1322 is the hole transport layer. The refractive index of the first charge transport layer 1322 is in the range of 1.7 to 2.0, meaning the refractive index of the hole transport layer is also in the range of 1.7 to 2.0. For example, the refractive index of the hole transport layer can be 1.7, 1.8, 1.9, or 2.0. Specifically, when the first electrode 131, which is a total internal reflection electrode, is the anode, setting the refractive index range of the hole transport layer to 1.7 to 2.0 can effectively adjust the microcavity, effectively suppress the SPP mode in the light-emitting element 130, increase the waveguide mode and air mode, and further improve the light extraction efficiency of the display panel 100.

[0065] When the light-emitting element 130 is a stacked device, i.e., the number of light-emitting units 132 is at least two, the refractive index of the hole transport layer in different light-emitting units 132 can be the same or different. Furthermore, only one light-emitting unit 132 can have a hole transport layer with a refractive index ranging from 1.7 to 2.0, or all light-emitting units 132 can have a hole transport layer with a refractive index ranging from 1.7 to 2.0. When there are multiple light-emitting elements 130, the refractive index of the hole transport layer in all multiple light-emitting elements 130 can be equal, thus allowing the use of the same material during fabrication and simplifying the fabrication process.

[0066] In another embodiment, such as Figure 10 and Figure 11As shown, the first electrode 131 is a cathode, and the first charge transport layer 1322 is an electron transport layer. The refractive index of the first charge transport layer 1322 is in the range of 1.7 to 1.8, meaning the refractive index of the electron transport layer is also in the range of 1.7 to 1.8. For example, the refractive index of the electron transport layer can be 1.7, 1.75, or 1.8. Specifically, when the first electrode 131, which is a total internal reflection electrode, is a cathode, setting the refractive index range of the electron transport layer to 1.7 to 1.8 can effectively adjust the microcavity, effectively suppress the SPP mode in the light-emitting element 130, increase the waveguide mode and air mode, and further improve the light extraction efficiency of the display panel 100.

[0067] When the light-emitting element 130 is a stacked device, the refractive index of the electron transport layer in different light-emitting units 132 can be the same or different. Furthermore, only one light-emitting unit 132 can have an electron transport layer with a refractive index ranging from 1.7 to 1.8, or all light-emitting units 132 can have an electron transport layer with a refractive index ranging from 1.7 to 1.8. When there are multiple light-emitting elements 130, the refractive index of the electron transport layer in all multiple light-emitting elements 130 can be equal, thus allowing the use of the same material during fabrication and simplifying the fabrication process.

[0068] See Figure 12 When the first electrode 131 is the anode, the light-emitting unit 132 further includes an electron blocking layer 1326. The electron blocking layer 1326 is located between the first charge transport layer 1322 and the light-emitting material layer 1321. The refractive index of the electron blocking layer 1326 is in the range of 1.85 to 2.0. For example, the refractive index of the electron blocking layer 1326 is 1.85, 1.95 or 2.0.

[0069] Continue reading Figure 12 When the first electrode 131 is the anode, the light-emitting unit 132 further includes a hole injection layer 1325, which is located between the first electrode 131 and the first charge transport layer 1322. The refractive index of the hole injection layer 1325 is in the range of 1.6 to 1.7, for example, the refractive index of the hole injection layer 1325 is in the range of 1.6, 1.65 or 1.7.

[0070] In the above scheme, the refractive index range of the hole injection layer 1325 is set to 1.6 to 1.7, and / or the refractive index range of the electron blocking layer 1326 is 1.85 to 2.0, which can further effectively adjust the microcavity, further suppress the SPP mode in the light-emitting element 130, increase the waveguide mode and air mode, and further improve the light extraction efficiency of the display panel 100.

[0071] See Figure 13When the first electrode 131 is a cathode, the light-emitting unit 132 further includes a hole-blocking layer 1328, which is located between the first charge transport layer 1322 and the light-emitting material layer 1321. The refractive index of the first electrode 131 is in the range of 0.2 to 0.8, for example, 0.2, 0.5, 0.6, 0.7 or 0.8. The refractive index of the hole-blocking layer 1328 is in the range of 1.7 to 1.8, for example, 1.7, 1.75 or 1.8. In this embodiment, the refractive index of the first electrode 131 is in the range of 0.2 to 0.8, and the refractive index of the hole-blocking layer 1328 is in the range of 1.7 to 1.8. This can further effectively adjust the microcavity, further suppress the SPP mode in the light-emitting element 130, increase the waveguide mode and air mode, and further improve the light extraction efficiency of the display panel 100.

[0072] Continue reading Figure 13 When the first electrode 131 is a cathode, the light-emitting unit 132 further includes an electron injection layer 1327 located between the first electrode 131 and the first charge transport layer 1322.

[0073] Continue reading Figure 1 The display panel 100 also includes an isolation structure 180, which is disposed on the side of the pixel definition layer 120 away from the substrate 110 and has a second opening for limiting the light-emitting element 130. The light-emitting element 130 and the groove 122 are both located in the second opening. The isolation structure 180 includes a first end 1801 facing the substrate 110 and a second end 1802 away from the substrate 110. The orthographic projection of the first end 1801 on the substrate 110 is located within the orthographic projection of the second end 1802 on the substrate 110.

[0074] Specifically, the isolation structure 180 has a mesh-like structure, with the second opening being the mesh opening. The isolation structure 180 is generally wider at the top and narrower at the bottom. This allows for the deposition of the functional layers (including hole injection layer 1325, hole transport layer, electron blocking layer 1326, luminescent material layer 1321, hole blocking layer 1328, electron transport layer, and electron injection layer 1327) of the light-emitting element 130 along its entire surface during fabrication. At the edge of the isolation structure 180, due to the step difference, the functional layers of the light-emitting element 130 are interrupted, ensuring they are completely within the second opening. This eliminates the need for precision mask alignment during functional layer fabrication, reducing costs. Furthermore, the isolation structure 180 also prevents optical crosstalk between adjacent light-emitting elements 130.

[0075] In one embodiment, see further. Figure 1 When the light-emitting element 130 is a top-emitting element, and the first electrode 131, at least one light-emitting unit 132 and the second electrode 133 are stacked sequentially in the direction Y away from the substrate 110, the second electrode 133 is provided to have a raised tail portion that overlaps the side wall of the isolation structure 180, that is, the second electrode 133 overlaps with the isolation structure 180. At the same time, the material of the isolation structure 180 includes a conductive material, so that the second electrode 133 is electrically connected to the isolation structure 180, and a voltage can be applied to the second electrode 133 through the isolation structure 180.

[0076] In one embodiment, see further. Figure 1 The isolation structure 180 includes a first isolation layer 183 and a second isolation layer 184 stacked sequentially in the direction away from the substrate 110. The orthographic projection of the first isolation layer 183 on the substrate 110 is located within the orthographic projection of the second isolation layer 184 on the substrate 110. That is, the first isolation layer 183 is recessed relative to the second isolation layer 184, so that the isolation structure 180 is generally wider at the top and narrower at the bottom.

[0077] Combination Figure 1 as well as Figure 14 The isolation structure 180 further includes a third isolation layer 185, which is located between the first isolation layer 183 and the substrate 110. The orthographic projection of the first isolation layer 183 on the substrate 110 is within the orthographic projection of the third isolation layer 185 on the substrate 110, that is, the first isolation layer 183 is recessed relative to the third isolation layer 185.

[0078] In one embodiment, the first isolation layer 183 is made of aluminum, the second isolation layer 184 is made of titanium, and the third isolation layer 185 is made of molybdenum. The combination of the molybdenum layer, aluminum layer, and titanium layer can ensure that the impedance of the isolation structure 180 is the lowest, and the titanium layer can also protect the aluminum layer and prevent the aluminum layer from being etched.

[0079] Continue reading Figure 1 The orthographic projection of the second end 1802 on the substrate 110 and the orthographic projection of the groove 122 on the substrate 110 are spaced apart, so that when the light-emitting element 130 is a top light-emitting element, the second end 1802 can avoid affecting the light emitted from the groove 122.

[0080] In addition, this application also protects a display device, which includes the display panel 100 in any of the above embodiments. For the specific structure, please refer to the relevant content above. The display device can be any device with limited functions, such as a mobile phone, computer, or game console, and is not limited here.

[0081] The above description is merely an embodiment of this application and does not limit the patent scope of this application. Any equivalent structural or procedural transformations made using the content of this application's specification and drawings, or direct or indirect applications in other related technical fields, are similarly included within the patent protection scope of this application.

Claims

1. A display panel, characterized in that: The display panel comprises: substrate; A pixel definition layer is arranged on one side of the substrate, and the pixel definition layer is provided with a first opening; A light emitting element is disposed in the first opening, and the pixel definition layer is provided with a groove located at the periphery of the first opening portion; A reflective structure is disposed at least partially around the first opening, and is used to reflect the light emitted by the light emitting element and entering the groove to be emitted from the light emitting surface of the display panel.

2. The display panel according to claim 1, characterized in that: The groove is a through groove that penetrates the pixel definition layer; Preferably, a reflective layer is formed on a surface of the reflective structure facing away from the substrate; Preferably, the material of the reflective layer includes metal; Preferably, the material of the reflective structure includes metal.

3. The display panel according to claim 2, characterized in that: The reflective structure is disposed between the substrate and the pixel definition layer, and the orthographic projection of the reflective structure on the substrate and the orthographic projection of the groove on the substrate are at least partially overlapped; Preferably, the orthographic projection of the reflective structure on the substrate covers the orthographic projection of the groove on the substrate.

4. The display panel according to claim 3, characterized in that: The display panel further comprises: A connection layer, arranged between the substrate and the pixel definition layer, comprising a connection wire electrically connected to the light emitting element, wherein the reflective structure and the connection wire are arranged in the same layer; Preferably, the reflective structure and the connecting wire are made of the same material; Preferably, the display panel further comprises a driving circuit layer located between the substrate and the connecting layer, the driving circuit layer comprises a pixel driving circuit, and the connecting wire electrically connects the pixel driving circuit and the light emitting element; Preferably, the display panel further comprises an insulating layer, which is arranged between the substrate and the pixel definition layer, and the connecting layer is located on a side of the insulating layer facing the substrate, wherein the orthographic projection of the insulating layer on the substrate covers the orthographic projection of the reflective structure on the substrate, or at least part of the reflective structure is exposed from the insulating layer; Preferably, the reflective structure comprises a first titanium layer, an aluminum layer and a second titanium layer which are sequentially stacked in a direction away from the substrate.

5. The display panel according to claim 2, characterized in that: The width of the groove decreases in a direction away from the substrate; Preferably, the cross section of the groove is trapezoidal; Preferably, the angle formed between the groove wall of the groove and the substrate is in the range of 75° to 85°; Preferably, in a direction away from the substrate, a cross section of the reflective structure is in the shape of a right trapezoid.

6. The display panel according to claim 1, characterized in that: The width of the groove ranges from 2 to 5 um; Preferably, the luminous color of the light-emitting element is red, and the width of the groove ranges from 3 to 5um, or the luminous color of the light-emitting element is green, and the width of the groove ranges from 2.5 to 5um, or the luminous color of the light-emitting element is blue, and the width of the groove ranges from 2 to 5um.

7. The display panel according to claim 1, characterized in that: There are multiple light-emitting elements, wherein the larger the wavelength of the light emitted by the light-emitting element is, the larger the width of the groove arranged at the periphery of the first opening corresponding to the light-emitting element is.

8. The display panel according to claim 1, characterized in that: The light-emitting element comprises a first electrode, at least one light-emitting unit and a second electrode which are stacked in sequence, the first electrode is a total reflection electrode, the second electrode is a light-transmitting electrode, each of the light-emitting units comprises a light-emitting material layer and a first charge transport layer located between the first electrode and the light-emitting material layer, wherein the first electrode is an anode, the first charge transport layer is a hole transport layer, and the refractive index of the first charge transport layer is in the range of 1.7 to 2.0, or the first electrode is a cathode, the first charge transport layer is an electron transport layer, and the refractive index of the first charge transport layer is in the range of 1.7 to 1.8; Preferably, the first electrode is an anode, the light-emitting unit further comprises an electron blocking layer, the electron blocking layer is located between the first charge transport layer and the light-emitting material layer, and the refractive index of the electron blocking layer is in the range of 1.85 to 2.0; Preferably, the first electrode is an anode, the light-emitting unit further comprises a hole injection layer, the hole injection layer is located between the first electrode and the first charge transport layer, and the refractive index of the hole injection layer is in the range of 1.6 to 1.7; Preferably, the first electrode is a cathode, and the light-emitting unit further comprises a hole blocking layer, and the hole blocking layer is located between the first electrode and the light-emitting material layer, wherein the refractive index of the first electrode is in the range of 0.2 to 0.8, and / or the refractive index of the hole blocking layer is in the range of 1.7 to 1.8; Preferably, the number of the light emitting units is at least two.

9. The display panel according to claim 1, characterized in that: The display panel further includes: an isolation structure, arranged on a side of the pixel definition layer away from the substrate and provided with a second opening for limiting the light emitting element, wherein the first opening and the groove are both located in the second opening, and the isolation structure includes a first end facing the substrate and a second end away from the substrate, and an orthographic projection of the first end on the substrate is located within an orthographic projection of the second end on the substrate; Preferably, the orthographic projection of the second end on the substrate is spaced apart from the orthographic projection of the groove on the substrate; Preferably, the isolation structure is a grid structure.

10. A display panel, characterized in that: The display panel comprises: substrate; A pixel definition layer is arranged on one side of the substrate, and the pixel definition layer is provided with a first opening; A light-emitting element is arranged in the first opening, and the light-emitting element includes a first electrode, at least one light-emitting unit and a second electrode stacked in sequence, the first electrode is a total reflection electrode, the second electrode is a light-transmitting electrode, each of the light-emitting units includes a light-emitting material layer and a first charge transfer layer located between the first electrode and the light-emitting material layer, wherein the refractive index range of the first charge transfer layer is 1.7 to 2.

0.

11. The display panel according to claim 10, characterized in that: The first electrode is an anode, and the first charge transport layer is a hole transport layer; Alternatively, the first electrode is a cathode, the first charge transport layer is an electron transport layer, and the refractive index of the first charge transport layer is in the range of 1.7 to 1.

8.

12. The display panel according to claim 10, characterized in that: The first electrode is an anode, the light-emitting unit further comprises an electron blocking layer, the electron blocking layer is located between the first charge transport layer and the light-emitting material layer, and the refractive index of the electron blocking layer is in the range of 1.85 to 2.0; Alternatively, the first electrode is an anode, the light-emitting unit further comprises a hole injection layer, the hole injection layer is located between the first electrode and the first charge transport layer, and the refractive index of the hole injection layer is in the range of 1.6 to 1.7; Alternatively, the first electrode is a cathode, and the light-emitting unit further includes a hole blocking layer, which is located between the first electrode and the light-emitting material layer, wherein the refractive index of the first electrode ranges from 0.2 to 0.8, and the refractive index of the hole blocking layer ranges from 1.7 to 1.

8.

13. The display panel according to claim 10, characterized in that: The pixel definition layer is provided with a groove located at the periphery of the first opening portion; the display panel further comprises: a reflective structure, disposed at least partially around the first opening, for reflecting the light emitted by the light emitting element and entering the groove to be emitted from the light emitting surface of the display panel; Preferably, the reflective structure is arranged between the substrate and the pixel definition layer, and the orthographic projection of the reflective structure on the substrate and the orthographic projection of the groove on the substrate are at least partially overlapped; Preferably, the display panel further comprises a connection layer, which is arranged between the substrate and the pixel definition layer, and comprises connection wiring electrically connected to the light emitting element, wherein the reflective structure and the connection wiring are arranged in the same layer.

14. The display panel according to claim 13, characterized in that: The number of the light-emitting elements is multiple, wherein the larger the wavelength of the light emitted by the light-emitting element, the larger the width of the groove arranged at the periphery of the first opening corresponding to the light-emitting element; Preferably, the width of the groove is in the range of 2 to 5 um.

15. A display device, characterized in that: Comprising the display panel as claimed in any one of claims 1 to 14.

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