Display panel and display device

Abstract

The application provides a display panel and a display device, relates to the technical field of display, and improves horizontal leakage. The display panel comprises a substrate, an anode, a first pixel definition layer located on the side of the anode away from the substrate, and a second pixel definition layer located on the side of the first pixel definition layer away from the substrate, wherein the transmittance of the first pixel definition layer is less than that of the second pixel definition layer; the first pixel definition layer comprises a first opening and a second opening, the first opening overlaps the anode, at least part of the first opening is separated from the second opening, and the bottom width of the first opening and the second opening is greater than the top width; the second pixel definition layer comprises a third opening and a fourth opening, the third opening is located in the first opening, the bottom width of the third opening is less than the top width, and the side surface of the first opening is covered by the second pixel definition layer; the fourth opening overlaps the second opening, and the second side surface of the second opening is exposed by the second pixel definition layer at least in part; a light-emitting layer is located in the third opening; a functional layer; and a cathode.

Description

Technical Field

[0001] This invention relates to the field of display technology, and more particularly to a display panel and display device. Background Technology

[0002] In display panels, the carrier injection layer and other common film layers in the light-emitting devices are continuously arranged across the entire surface, resulting in lateral leakage current paths between adjacent sub-pixels. When a sub-pixel is driven to emit light, its neighboring sub-pixels that should not emit light will be illuminated by the lateral leakage current, leading to pixel crosstalk, decreased black-state contrast, and other poor display problems. Summary of the Invention

[0003] This invention provides a display panel and display device for improving lateral leakage problems.

[0004] In a first aspect, embodiments of the present invention provide a display panel, comprising: Substrate; The anode is located on one side of the substrate; A first pixel definition layer and a second pixel definition layer are provided. The first pixel definition layer is located on the side of the anode away from the substrate, and the second pixel definition layer is located on the side of the first pixel definition layer away from the substrate. The transmittance of the first pixel definition layer is less than that of the second pixel definition layer. The first pixel definition layer includes a first opening and a second opening. In a direction perpendicular to the plane of the substrate, the first opening at least partially overlaps with the anode, and at least partially adjacent first openings are spaced apart by the second opening. The width of the first opening near the substrate is greater than the width away from the substrate, and the width of the second opening near the substrate is greater than the width away from the substrate. The second pixel definition layer includes a third opening and a fourth opening. In a direction perpendicular to the plane of the substrate, the third opening at least partially overlaps with the anode and is located within the first opening. The width of the third opening near the substrate is less than the width away from the substrate. The side of the first opening is a first side surface, which is covered by the second pixel definition layer. In a direction perpendicular to the plane of the substrate, the fourth opening overlaps with the second opening. The second opening includes a second side surface, which is exposed by the second pixel definition layer at at least a portion of its position. The light-emitting layer is located at the third opening; A functional layer is located at the third opening and on the side of the second pixel definition layer away from the substrate; The cathode is located on the side of the functional layer away from the substrate.

[0005] Secondly, based on the same inventive concept, embodiments of the present invention also provide a display device, including the aforementioned display panel.

[0006] The technical solution provided by the embodiments of the present invention has the following beneficial effects: This invention provides a stacked structure with a dual-layer pixel definition layer, which can simultaneously achieve the function of isolating functional layers, better sub-pixel light emission effect, and better anti-reflection effect.

[0007] Specifically, in this stacked structure of dual pixel definition layers, the lower first pixel definition layer includes a first opening and a second opening formed in the same photolithography process. The second opening has a structure that is narrower at the top and wider at the bottom. Therefore, this portion of the first pixel definition layer on one side of the second opening has an undercut structure. When the second side of the second opening is exposed by the second pixel definition layer, the material of the functional layer cannot be continuously deposited at the second side, causing the functional layer at the top of the second pixel definition layer and the functional layer at the bottom of the second opening to be disconnected from each other. This effectively cuts off the transmission path of lateral leakage current and suppresses lateral leakage current between adjacent sub-pixels.

[0008] For the first opening, the first opening at least partially overlaps with the anode. The first opening and the second opening are formed in the same photolithography process, and both have a structure that is narrow at the top and wide at the bottom. Therefore, this part of the first pixel definition layer on one side of the first opening also has an undercut structure. To avoid this undercut structure blocking the large-angle light of the light-emitting device, the embodiments of the present invention further configure a second pixel definition layer above the first pixel definition layer. The second pixel definition layer includes a third opening and a fourth opening formed in the same photolithography process. The first side of the first opening is completely covered by the second pixel definition layer, so that the third opening is located inside the first opening. By setting the third opening to a structure that is wide at the top and narrow at the bottom, on the one hand, the light emission area and the light emission angle of the light-emitting device can be defined based on the shape of the third opening. The large-angle light emitted by the light-emitting device can be emitted normally through the third opening, improving the brightness of the large viewing angle. On the other hand, the materials of the functional layer and the cathode can smoothly climb along the side of the third opening during the deposition process, and are continuous inside and around the third opening, ensuring their light emission performance.

[0009] Furthermore, the second pixel definition layer also serves a protective function. The second pixel definition layer covers the first side of the first opening, preventing uneven thickness of the functional layer and cathode at the bottom corner of the first opening due to film abnormalities. This prevents the formation of conductive paths between the cathode and anode in areas where the film layer is too thin, further improving the structural stability of the light-emitting device.

[0010] Furthermore, in the display panel, an array layer is also included between the anode and the substrate. The array layer includes multiple metal layers for forming transistors and various signal lines. In this stacked structure of dual pixel definition layers, the lower first pixel definition layer is set to have low transmittance, and the upper second pixel definition layer is set to have high transmittance. This way, the light-shielding first pixel definition layer is closer to the metal layers in the array layer, which can better prevent ambient light from entering the array layer and being reflected back by the metal layers within the array layer, thereby achieving better anti-reflection. This structure is more suitable for panel architectures with depolarizers.

[0011] Furthermore, in this embodiment of the invention, the second opening in the first pixel definition layer is formed simultaneously with the first opening in the same photolithography process, and the fourth opening in the second pixel definition layer is formed simultaneously with the third opening in the same photolithography process. The material of the pixel definition layer is typically a photoresist material, and during the photolithography process, the material itself can be directly exposed and developed to form the opening. Therefore, in this embodiment of the invention, no additional photoresist is required during the formation of the first and second pixel definition layers, thus eliminating the need for a photoresist stripping process. In particular, for the first pixel definition layer, it does not need to contact the photoresist stripping solution, thereby avoiding the fading problem caused by contact between the first pixel definition layer and the photoresist stripping solution, maintaining excellent light-shielding properties, and achieving a better anti-reflection effect. Attached Figure Description

[0012] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0013] Figure 1A A top view of the first pixel definition layer and the second pixel definition layer provided in an embodiment of the present invention; Figure 1B for Figure 1A A schematic diagram of the first pixel definition layer; Figure 1C for Figure 1A A schematic diagram of the second pixel definition layer; Figure 1D for Figure 1A A schematic diagram of the portion of the first pixel definition layer exposed by the second pixel definition layer; Figure 2 A schematic diagram of a display panel provided in an embodiment of the present invention; Figure 3Another schematic diagram of a display panel provided in an embodiment of the present invention; Figure 4 This is a schematic diagram of the manufacturing process of a display panel provided in an embodiment of the present invention; Figure 5A Another top view of the first pixel definition layer and the second pixel definition layer provided in an embodiment of the present invention; Figure 5B for Figure 5A A schematic diagram of the first pixel definition layer; Figure 5C for Figure 5A A schematic diagram of the second pixel definition layer; Figure 5D for Figure 5A A schematic diagram of the portion of the first pixel definition layer exposed by the second pixel definition layer; Figure 6 This is another schematic diagram of a display panel provided in an embodiment of the present invention; Figure 7 Another schematic diagram of a display panel provided in an embodiment of the present invention; Figure 8A Another top view of the first pixel definition layer and the second pixel definition layer provided in the embodiments of the present invention; Figure 8B for Figure 8A A schematic diagram of the first pixel definition layer; Figure 8C for Figure 8A A schematic diagram of the second pixel definition layer; Figure 8D for Figure 8A A schematic diagram of the portion of the first pixel definition layer exposed by the second pixel definition layer; Figure 9 Another schematic diagram of a display panel provided in an embodiment of the present invention; Figure 10 Another schematic diagram of a display panel provided in an embodiment of the present invention; Figure 11 A schematic diagram of a second position provided in an embodiment of the present invention; Figure 12 Another schematic diagram of the second position provided in an embodiment of the present invention; Figure 13 Another schematic diagram of the second position provided in an embodiment of the present invention; Figure 14A Another top view of the first pixel definition layer and the second pixel definition layer provided in the embodiments of the present invention; Figure 14B for Figure 14A A schematic diagram of the portion of the first pixel definition layer exposed by the second pixel definition layer; Figure 15A Another top view of the first pixel definition layer and the second pixel definition layer provided in the embodiments of the present invention; Figure 15B for Figure 15A A schematic diagram of the portion of the first pixel definition layer exposed by the second pixel definition layer; Figure 16A Another top view of the first pixel definition layer and the second pixel definition layer provided in the embodiments of the present invention; Figure 16B for Figure 16A A schematic diagram of the portion of the first pixel definition layer exposed by the second pixel definition layer; Figure 17 This is a schematic diagram of a display device provided in an embodiment of the present invention. Detailed Implementation

[0014] To better understand the technical solution of the present invention, the embodiments of the present invention will be described in detail below with reference to the accompanying drawings.

[0015] It should be understood that the described embodiments are merely some, not all, of the embodiments of the present invention. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without inventive effort are within the scope of protection of the present invention.

[0016] The terminology used in the embodiments of this invention is for the purpose of describing particular embodiments only and is not intended to limit the invention. The singular forms “a,” “the,” and “the” used in the embodiments of this invention are also intended to include the plural forms unless the context clearly indicates otherwise.

[0017] It should be understood that the term "and / or" used in this article is merely a description of the relationship between related objects, indicating that three relationships can exist. For example, A and / or B can represent: A existing alone, A and B existing simultaneously, and B existing alone. Additionally, the character " / " in this article generally indicates that the preceding and following related objects have an "or" relationship.

[0018] This invention provides a display panel. Figure 1A A top view of the first pixel definition layer and the second pixel definition layer provided in an embodiment of the present invention. Figure 1B for Figure 1A A schematic diagram of the first pixel definition layer. Figure 1C for Figure 1A A schematic diagram of the second pixel definition layer. Figure 1D for Figure 1A A schematic diagram of the portion of the first pixel definition layer exposed by the second pixel definition layer. Figure 2This is a schematic diagram of a display panel provided in an embodiment of the present invention. Figure 3 This is another schematic diagram of a display panel provided in an embodiment of the present invention, wherein, Figure 3 The shapes of the first and second pixel definition layers shown in the diagram can be compared with... Figure 1A The positions of the sections A1-A2 correspond, as follows: Figures 1A-3 As shown, the display panel includes a substrate 1, an anode 2 located on one side of the substrate 1, a first pixel definition layer 3 located on the side of the anode 2 away from the substrate 1, and a second pixel definition layer 4 located on the side of the first pixel definition layer 3 away from the substrate 1.

[0019] In this design, the transmittance of the first pixel definition layer 3 is less than that of the second pixel definition layer 4. The first pixel definition layer 3 can be a black pixel definition layer, including a light-blocking photoresist material, while the second pixel definition layer 4 is a light-transmitting pixel definition layer, including a light-transmitting photoresist material.

[0020] The first pixel definition layer 3 includes a first opening 5 and a second opening 6. In a direction perpendicular to the plane of the substrate 1, the first opening 5 at least partially overlaps with the anode 2, and at least partially adjacent first openings 5 ​​are spaced apart by second openings 6. Furthermore, the width of the first opening 5 near the substrate 1 is greater than the width away from the substrate 1, and the width of the second opening 6 near the substrate 1 is greater than the width away from the substrate 1. That is, the bottom width of the first opening 5 is greater than its top width, and the bottom width of the second opening 6 is greater than its top width. This portion of the first pixel definition layer 3, spaced between adjacent first openings 5, adjacent second openings 6, and adjacent first openings 5 ​​and second openings 6, has an undercut structure. The shape of its first cross-section is an inverted trapezoid, and the first cross-section is perpendicular to the substrate 1 and parallel to the arrangement direction of its adjacent openings on both sides.

[0021] The second pixel definition layer 4 includes a third opening 7 and a fourth opening 8. In a direction perpendicular to the plane of the substrate 1, the third opening 7 at least partially overlaps with the anode 2, and the third opening 7 is located within the first opening 5. The width of the third opening 7 on the side closer to the substrate 1 is smaller than the width on the side farther from the substrate 1, meaning the bottom width of the first opening 5 is smaller than its top width. The side of the first opening 5 is a first side 9, which is covered by the second pixel definition layer 4. In a direction perpendicular to the plane of the substrate 1, the fourth opening 8 overlaps with the second opening 6. The second opening 6 includes a second side 10, which is exposed by the second pixel definition layer 4 at least partially.

[0022] The display panel also includes a light-emitting layer 11, a functional layer 12, and a cathode 13. The light-emitting layer 11 is located within the third opening 7. The functional layer 12 is a common film layer, which may include, for example, a carrier injection layer, a carrier transport layer, and a charge generation layer. The functional layer 12 is located in the third opening 7 and on the side of the second pixel definition layer 4 away from the substrate 1. The cathode 13 is located on the side of the functional layer 12 away from the substrate 1.

[0023] This invention provides a stacked structure with a dual-layer pixel definition layer, which can simultaneously achieve the function of isolating the functional layer 12, the sub-pixel light emission effect, and the anti-reflection effect.

[0024] Specifically, in this stacked structure of dual pixel definition layers, the lower first pixel definition layer 3 includes a first opening 5 and a second opening 6 formed in the same photolithography process. The second opening 6 has a structure that is narrower at the top and wider at the bottom. Therefore, this portion of the first pixel definition layer 3 on one side of the second opening 6 has an undercut structure. When the second side 10 of the second opening 6 is exposed by the second pixel definition layer 4, the material of the functional layer 12 cannot be continuously deposited at the second side 10. This causes the functional layer 12 located at the top of the second pixel definition layer 4 and the functional layer 12 located at the bottom of the second opening 6 to be disconnected from each other, thereby effectively cutting off the transmission path of lateral leakage current and suppressing lateral leakage current between adjacent sub-pixels.

[0025] For the first opening 5, the first opening 5 at least partially overlaps with the anode 2. The first opening 5 and the second opening 6 are formed in the same photolithography process, and are also narrow at the top and wide at the bottom. Thus, this part of the first pixel definition layer 3 on one side of the first opening 5 also has an undercut structure. To avoid this undercut structure blocking the large-angle light of the light-emitting device, the embodiment of the present invention further configures a second pixel definition layer 4 above the first pixel definition layer 3. The second pixel definition layer 4 includes a third opening 7 and a fourth opening 8 formed in the same photolithography process. The first side 9 of the first opening 5 is completely covered by the second pixel definition layer 4, so that the third opening 7 is located inside the first opening 5. By setting the third opening 7 to be wide at the top and narrow at the bottom, on the one hand, the light-emitting area and the light-emitting angle of the light-emitting device can be defined based on the shape of the third opening 7. The large-angle light emitted by the light-emitting device can be emitted normally through the third opening 7, improving the brightness of the large viewing angle. On the other hand, the materials of the functional layer 12 and the cathode 13 can smoothly climb along the side of the third opening 7 during the deposition process, and are continuous inside and around the third opening 7, ensuring its light-emitting performance.

[0026] Furthermore, the second pixel definition layer 4 also serves a protective function. The second pixel definition layer 4 covers the first side 9 of the first opening 5, which can prevent uneven thickness of the functional layer 12 and the cathode 13 caused by abnormal film layer at the bottom corner of the first opening 5, thereby preventing the formation of a conductive path between the cathode 13 and the anode 2 at the thinner film layer, and further improving the structural stability of the light-emitting device.

[0027] Furthermore, in the display panel, see Figure 2 An array layer 50 is also included between the anode 2 and the substrate 1. The array layer 50 includes multiple metal layers for forming transistors and various signal lines (not shown in the figure). In this stacked structure of dual pixel definition layers, the lower first pixel definition layer 3 is set to have low transmittance, and the upper second pixel definition layer 4 is set to have high transmittance. In this way, the light-shielding first pixel definition layer 3 is closer to the metal layers in the array layer 50, which can better prevent ambient light from entering the array layer 50 and being reflected by the metal in the array layer 50, thereby achieving a better anti-reflection effect. This structure is more suitable for panel architectures with depolarizers.

[0028] It should be noted that, in this embodiment of the invention, the second opening 6 in the first pixel definition layer 3 and the first opening 5 are formed simultaneously in the same photolithography process, and the fourth opening 8 in the second pixel definition layer 4 and the third opening 7 are formed simultaneously in the same photolithography process. The material of the pixel definition layer is usually a photoresist material, and during the photolithography process, the material itself can be directly exposed and developed to form the openings. Therefore, in this embodiment of the invention, no additional photoresist is introduced during the formation of the first pixel definition layer 3 and the second pixel definition layer 4, and thus no photoresist stripping process is required. In particular, for the first pixel definition layer 3, the first pixel definition layer 3 does not need to contact the photoresist stripping liquid, thereby avoiding the fading problem caused by the first pixel definition layer 3 contacting the photoresist stripping liquid, allowing the first pixel definition layer 3 to maintain excellent light-shielding properties and achieve a better anti-reflection effect.

[0029] In some implementations... Figure 4 This is a schematic diagram of a manufacturing process for a display panel provided in an embodiment of the present invention, such as... Figure 4 As shown, the preparation process of the first pixel definition layer 3 and the second pixel definition layer 4 can be as follows: First, a black photoresist material 60 is coated on the entire surface, the black photoresist material 60 is exposed, and then the exposed black photoresist material 60 is developed to form the first pixel definition layer 3 with the first opening 5 and the second opening 6; then, a transparent photoresist material 70 is coated on the entire surface, the transparent photoresist material 70 is exposed, and then the exposed transparent photoresist material 70 is developed to form the second pixel definition layer 4 with the third opening 7 and the fourth opening 8.

[0030] In some implementations, the first opening 5 and the second opening 6 penetrate the first pixel definition layer 3.

[0031] The angle between the side of the first opening 5 and the surface of the first pixel definition layer 3 that is adjacent to it and closer to the substrate 1 is the first angle, and the angle between the side of the second opening 6 and the surface of the first pixel definition layer 3 that is adjacent to it and closer to the substrate 1 is the second angle. See, for example... Figure 3 The second angle includes α1, and the first angle includes α4. Both the first and second angles are greater than 90°, and the first and second angles are equal.

[0032] The first opening 5 and the second opening 6 are through openings formed in the same photolithography process. They are formed under the same process conditions, so the tilt angles of their sides can be kept consistent.

[0033] In some implementations, see again Figure 2 The light-emitting layer 11 includes a first light-emitting layer 11-1 and a second light-emitting layer 11-2. The functional layer 12 includes a charge-generating layer 12-1, which is located between the first light-emitting layer 11-1 and the second light-emitting layer 11-2 within the third opening 7.

[0034] The sub-pixels in this structure include series-connected light-emitting devices. These devices utilize at least two stacked light-emitting units, which reduces the operating current of the light-emitting devices while achieving the same display brightness, thereby significantly reducing panel power consumption. Based on the technical solution provided in this embodiment, the charge generation layer 12-1 is disconnected at the second side 10 between adjacent sub-pixels, thus effectively cutting off the lateral leakage path in the charge generation layer 12-1.

[0035] In other embodiments, the functional layer 12 may also include a carrier injection layer and a carrier transport layer. For example, the functional layer 12 may include at least one of an electron injection layer, a hole injection layer, an electron transport layer, and a hole transport layer.

[0036] In some implementations, the first pixel definition layer 3 includes a negative photoresist material.

[0037] Combination Figure 4 When performing photolithography on negative photoresist materials, the retained portions require exposure, while the removed portions do not. During exposure, the bottom of the retained portions may suffer from insufficient cross-linking due to inadequate exposure. Consequently, during development, the developer will laterally etch the bottom of the retained portions, causing them to naturally form an inverted trapezoidal structure that is wider at the top and narrower at the bottom. The first pixel definition layer 3 is formed from negative photoresist material, and the desired morphology can be formed without additional processing steps, simplifying the fabrication process.

[0038] In some implementations, see again Figure 3 The first pixel definition layer 3 includes a first top surface 14 that is connected to the second side surface 10. At least a portion of the first top surface 14 is exposed by the second pixel definition layer 4, and the portions of the first top surface 14 and the second side surface 10 exposed by the second pixel definition layer 4 are continuous.

[0039] in, Figure 1D , Figure 5D , Figure 8D The position in the first pixel definition layer 3 that is exposed by the second pixel definition layer 4 can correspond to the position of the first top surface 14 that is exposed by the second pixel definition layer 4, or it can correspond to the position of the second side surface 10 that is exposed by the second pixel definition layer 4.

[0040] The first top surface 14 is exposed by the second pixel definition layer 4, which provides a certain process tolerance for the opening accuracy of the first pixel definition layer 3 and the second pixel definition layer 4, preventing the opening position from shifting and causing the part of the second side surface 10 that should be exposed to be covered. In this design, the parts of the first top surface 14 and the second side surface 10 exposed by the second pixel definition layer 4 form an inverted T structure, which can strengthen the isolation effect of the stacked structure on the functional layer 12 and improve the ability to suppress lateral leakage.

[0041] In some implementations, see again Figure 3 The width L0 of the first top surface 14 exposed by the second pixel definition layer 4 is greater than or equal to 1 μm, so as to ensure that sufficient margin can be provided for the opening accuracy of the first pixel definition layer 3 and the second pixel definition layer 4, and to ensure that the part of the second side surface 10 that should be exposed is not covered.

[0042] In this embodiment of the invention, when the two opposite sides of the second opening 6 are both second side 10, the L0 corresponding to the first top surface 14 where the two second side 10 are connected can be equal or unequal.

[0043] In some implementations, see again Figure 3 The first pixel definition layer 3 includes a first sub-part 15, which is spaced between adjacent first openings 5 ​​and second openings 6. The first sub-part 15 includes a first side surface 9, a second side surface 10 and a first top surface 14.

[0044] Specifically, the width L1 of the first top surface 14 in the first sub-part 15 is greater than or equal to 3 μm, and / or the width L2 of the first top surface 14 in the first sub-part 15 covered by the second pixel definition layer 4 is greater than or equal to 3 μm. It can be understood that L1 = L2 + L0.

[0045] When L1 and L2 meet the above conditions, the first sub-part 15 can provide sufficient support width to effectively support the upper second pixel definition layer 4, so that the opening in the second pixel definition layer 4 can be accurately formed, and the second pixel definition layer 4 covers the first side 9 and exposes the second side 10.

[0046] In this embodiment of the invention, when the second opening 6 includes first sub-parts 15 on both opposite sides, the L1 and L2 corresponding to the two first sub-parts 15 can be the same or different. For example, in Figure 3 In the middle, the L1 and L2 corresponding to the two first sub-parts 15 are different.

[0047] In some implementations, see again Figure 3 The first pixel definition layer 3 includes a first bottom surface 16 connected to the second side surface 10. The angle between the second side surface 10 and the first bottom surface 16 is α1, 110°≤α1≤145°. That is, the bottom angle of the second opening 6 at the second side surface 10 is α0, 45°≤α0≤80°.

[0048] When α1 meets the above conditions, the tilt angle of the second side 10 can ensure that the functional layer 12 cannot be continuously filmed at this position, naturally forming a break point and blocking the lateral current path. On the other hand, it can also make the structure of the first pixel definition layer 3 between the second opening 6 and the adjacent first opening 5 or the adjacent second opening 6 stable, not easy to tilt or detach under the action of external force, thus improving the structural performance of the first pixel definition layer 3.

[0049] In some implementations, see again Figure 3 The minimum width L3 of the second opening 6 is greater than or equal to 3 μm. This minimum width can be understood as the width of the second opening 6 on the side away from the substrate 1, that is, the top width of the second opening 6. Under the condition that this width is greater than or equal to 3 μm, its specific value can be set according to the exposure and development capabilities of the photolithography process.

[0050] When L3 meets the above conditions, it can be ensured that the second opening 6 has sufficient width at the top. The material of the functional layer 12 will sink in the second opening 6 during the deposition process, and a break will be naturally formed at the second side 10, which will enhance the isolation effect of the functional layer 12.

[0051] In some implementations, see again Figure 3 The second pixel definition layer 4 includes a third side surface 17 and a second bottom surface 18 located in the first opening 5, and the angle between the third side surface 17 and the second bottom surface 18 is α2, where α2 ≤ 40°.

[0052] When α2 meets the above conditions, the tilt angle of the third side 17 is relatively gentle. The materials of the functional layer 12 and the cathode 13 can smoothly rise along the third side 17 during the deposition process without discontinuity due to the steepness of the third side 17, thus ensuring the light emission performance of the light-emitting device. Moreover, under this design, the maximum light emission angle of the light-emitting device is also larger, which can improve the brightness over a wide viewing angle.

[0053] In some implementations, see again Figure 3 The second pixel definition layer 4 includes a third side surface 17 located at the first opening 5. The distance L4 between the orthographic projection of the edge of the first side surface 9 away from the substrate 1 onto the substrate 1 and the orthographic projection of the edge of the adjacent third side surface 17 near the substrate 1 onto the substrate 1 is greater than or equal to 1 μm.

[0054] When L4 meets the above conditions, it helps to achieve the design goal of α2 being less than or equal to 40°. In other words, when α2 is constant, L4≥1μm, sufficient lateral spacing can be guaranteed at the bottom and top positions of the first opening 5, and between the third side 17 and the first side 9, and the morphology of the third opening 7 is stable, avoiding affecting the light emission of the light-emitting device.

[0055] In some implementations... Figure 5A This is another top view of the first pixel definition layer and the second pixel definition layer provided in an embodiment of the present invention. Figure 5B for Figure 5A A schematic diagram of the first pixel definition layer. Figure 5C for Figure 5A A schematic diagram of the second pixel definition layer. Figure 5D for Figure 5A A schematic diagram of the portion of the first pixel definition layer exposed by the second pixel definition layer. Figure 6 This is another schematic diagram of a display panel provided in an embodiment of the present invention. Figure 7 This is another schematic diagram of a display panel provided in an embodiment of the present invention, wherein, Figure 7 The shapes of the first pixel definition layer 3 and the second pixel definition layer 4 shown in the diagram can be compared with... Figure 5A The positions of the sections B1-B2 correspond, as follows: Figure 5A and Figure 7 As shown, at least part of the second opening 6 also includes a fourth side 19 opposite to the second side 10, and the fourth side 19 is covered by the second pixel definition layer 4.

[0056] The second pixel definition layer 4 includes a fifth side surface 30 and a third bottom surface 31 located in the second opening 6. The angle between the fifth side surface 30 and the third bottom surface 31 is α3, where α3 < 90°.

[0057] Based on this structure, during the deposition of the cathode material, the cathode material at the bottom of the second opening 6 can climb along the fifth side 30 to connect with the cathode material at the top of the second pixel definition layer 4, making the cathode 13 continuous on this side. This can improve the overall connectivity of the cathode 13 and reduce the impedance of the cathode 13, enabling the display panel to achieve lower power consumption.

[0058] Further, see again Figure 7 α3 ≤ 40°. In embodiments of the present invention, α3 and α2 can be equal.

[0059] When α3 meets the above conditions, the tilt angle of the fifth side 30 is relatively gentle. When the cathode material climbs along the fifth side 30, it can avoid breakage due to the steepness of the fifth side 30. The continuity of the cathode is better at this position.

[0060] In some implementations, see again Figure 7 The distance L5 between the orthographic projection of the edge of the fourth side 19 away from the substrate 1 onto the substrate 1 and the orthographic projection of the edge of the adjacent fifth side 30 near the substrate 1 onto the substrate 1 is greater than or equal to 1 μm. In this embodiment of the invention, L5 and L4 can be equal.

[0061] When L5 meets the above conditions, it helps to achieve the design goal of α3 being less than 90°. In other words, when α3 is constant, L5≥1μm, sufficient lateral spacing can be guaranteed between the fifth side 30 and the fourth side 19 at the bottom and top positions of the first opening 5, ensuring that the fourth side 19 is fully covered by the second pixel definition layer 4, thereby enabling the cathode material to climb stably at this position and improving cathode continuity.

[0062] In some implementations, see again Figure 7 The distance L6 between the orthographic projection of the edge of the second side 10 away from the substrate 1 on the substrate 1 and the orthographic projection of the edge of the fifth side 30 near the substrate 1 on the substrate 1 is greater than or equal to 2 μm.

[0063] When L6 meets the above conditions, there is a sufficient lateral gap between the second side 10 and the opposite fifth side 30. During the deposition process, the material of the functional layer 12 can avoid the material above the first top surface 14 from contacting and forming a connection with the material on the fifth side 30, thereby strengthening the isolation effect of the functional layer 12.

[0064] In some implementations, see again Figure 7 The first pixel definition layer 3 also includes a second top surface 20 connected to the fourth side surface 19, and the width L7 of the second top surface 20 covered by the second pixel definition layer 4 is greater than or equal to 3μm.

[0065] When L7 meets the above conditions, the portion of the first pixel definition layer 3 between the second opening 6 and the adjacent first opening 5 or another adjacent second opening 6 can provide sufficient support width, so that the opening in the second pixel definition layer 4 can be accurately shaped, and the second pixel definition layer 4 can completely cover the fourth side 19.

[0066] In some implementations, see again Figures 1A-3 Or, see again Figures 5A-7 At least some of the adjacent first openings 5 ​​are separated by only one second opening 6.

[0067] For example, some of the first openings 5 ​​are surrounded by second openings 6, while some of the first openings 5 ​​are not surrounded by first openings 5, so that at least some of the adjacent first openings 5 ​​are separated by only one second opening 6.

[0068] See again in some specific structures Figures 1A-1D Or, see again Figures 5A-5D The display panel includes a red sub-pixel P1, a green sub-pixel P2, and a blue sub-pixel P3. Correspondingly, the first opening 5 includes a red first opening 5-R corresponding to the red sub-pixel P1, a green first opening 5-G corresponding to the green sub-pixel P2, and a blue first opening 5-B corresponding to the blue sub-pixel P3; the third opening 7 includes a red third opening 7-R corresponding to the red sub-pixel P1, a green third opening 7-G corresponding to the green sub-pixel P2, and a blue third opening 7-B corresponding to the blue sub-pixel P3.

[0069] The display panel includes a first pixel group 21 and a second pixel group 22 arranged alternately along a first direction x. The first pixel group 21 includes red sub-pixels P1 and green sub-pixels P2 arranged alternately along a second direction y. The second pixel group 22 includes a plurality of blue pixel units 23 arranged along the second direction y, and each blue pixel unit 23 includes two blue sub-pixels P3. The first direction x intersects the second direction y.

[0070] Among them, the red first opening 5-R is surrounded by a second opening 6, the blue pixel unit 23 is surrounded by a second opening 6, and the green first opening 5-G is not surrounded by a second opening 6, so that there is only one second opening 6 between the adjacent red first opening 5-R and green first opening 5-G.

[0071] In this structure, the number of second openings 6 between adjacent first openings 5 ​​is small. While effectively separating the functional layers 12 between adjacent sub-pixels by using the first side 9 of the second openings 6, it can also take into account better cathode continuity and higher pixel density.

[0072] In some implementations, see again Figures 1A-3Along the arrangement direction of adjacent first openings 5, there are two second side surfaces 10 spaced apart between adjacent first openings 5. For example, in the second opening 6 surrounding the red first opening 5-R, the opposite sides of the second opening 6 are all exposed by the second pixel definition layer 4 to form the second side surface 10.

[0073] In this structure, the functional layer 12 can be separated twice between adjacent sub-pixels, resulting in better suppression of lateral leakage.

[0074] Alternatively, in some implementations, see again Figures 5A-7 Along the arrangement direction of adjacent first openings 5, there is only one second side 10 between adjacent first openings 5. For example, in the second opening 6 surrounding the red first opening 5-R, of the two opposite sides of the second opening 6, only one side is exposed by the second pixel definition layer 4 to form the second side 10, and the other side is covered by the second pixel definition layer 4 to form the fourth side 19.

[0075] In this structure, the first opening 5 only isolates the functional layer 12 on the second side 10, while the cathode is made continuous on the fourth side 19, which greatly improves the cathode continuity and significantly reduces the cathode load and panel power consumption.

[0076] In some embodiments, the light-emitting layer 11 includes a red light-emitting layer and a non-red light-emitting layer. The first opening 5 includes a first sub-opening and a second sub-opening. In a direction perpendicular to the plane of the substrate 1, the first sub-opening overlaps with the red light-emitting layer, and the second sub-opening overlaps with the non-red light-emitting layer. The distance between the second opening 6 and the first sub-opening is less than the distance between the second opening 6 and the second sub-opening, and / or, the side of the second opening 6 closest to the first sub-opening is the second side surface 10.

[0077] For example, see Figure 5B The first opening 5 includes a first sub-opening 33 and a second sub-opening 34. The first sub-opening 33 is a red first opening 5-R, and the second sub-opening 34 includes a green first opening 5-G. A second opening 6 surrounds the red first opening 5-R, while the green first opening 5-G is not surrounded by a second opening 6. Furthermore, the distance between the second opening 6 surrounding the red first opening 5-R and the red first opening 5-R is less than the distance between the second opening 6 and the green first opening 5-G, and the side of the second opening 6 closest to the red first opening 5-R is a second side 10.

[0078] The red subpixel has a lower activation voltage, making it more susceptible to "stealing" light due to lateral leakage current. The aforementioned structure can shorten the lateral distance between the red subpixel and the second side 10, thereby forming leakage current protection closer to the red subpixel and suppressing the diffusion of lateral leakage current into the red subpixel.

[0079] In some implementations... Figure 8A This is another top view of the first pixel definition layer and the second pixel definition layer provided in an embodiment of the present invention. Figure 8B for Figure 8A A schematic diagram of the first pixel definition layer. Figure 8C for Figure 8A A schematic diagram of the second pixel definition layer. Figure 8D for Figure 8A A schematic diagram of the portion of the first pixel definition layer exposed by the second pixel definition layer. Figure 9 This is another schematic diagram of a display panel provided in an embodiment of the present invention. Figure 10 This is another schematic diagram of a display panel provided in an embodiment of the present invention, wherein, Figure 10 The shapes of the first pixel definition layer 3 and the second pixel definition layer 4 shown in the diagram can be compared with... Figure 8A The positions of the C1-C2 section lines correspond as follows: Figure 8A and Figure 10 As shown, at least some of the adjacent first openings 5 ​​are spaced apart by two second openings 6, and along the arrangement direction of the adjacent first openings 5, there are two second side surfaces 10 spaced apart between the adjacent first openings 5, and the two second side surfaces 10 are the side surfaces of the two second openings 6 respectively.

[0080] For example, each first opening 5 is surrounded by a second opening 6, thereby achieving a spacing of two second openings 6 between at least some of the adjacent first openings 5.

[0081] See again in some specific structures Figures 8A-8D The display panel includes a red sub-pixel P1, a green sub-pixel P2, and a blue sub-pixel P3. Correspondingly, the first opening 5 includes a red first opening 5-R corresponding to the red sub-pixel P1, a green first opening 5-G corresponding to the green sub-pixel P2, and a blue first opening 5-B corresponding to the blue sub-pixel P3; the third opening 7 includes a red third opening 7-R corresponding to the red sub-pixel P1, a green third opening 7-G corresponding to the green sub-pixel P2, and a blue third opening 7-B corresponding to the blue sub-pixel P3.

[0082] The display panel includes a first pixel group 21 and a second pixel group 22 arranged alternately along a first direction x. The first pixel group 21 includes red sub-pixels P1 and green sub-pixels P2 arranged alternately along a second direction y. The second pixel group 22 includes a plurality of blue pixel units 23 arranged along the second direction y, and each blue pixel unit 23 includes two blue sub-pixels P3. The first direction x intersects the second direction y.

[0083] Among them, the red first opening 5-R is surrounded by a second opening 6, the green first opening 5-G is surrounded by a second opening 6, and the blue pixel unit 23 is surrounded by a second opening 6, so that there are two second openings 6 between any two adjacent first openings 5.

[0084] In this structure, two second openings 6 are arranged between adjacent first openings 5, and each second opening 6 includes an independent second side 10 and a fourth side 19. The two second side 10s spaced between adjacent sub-pixels can provide two separate partitions for the functional layer 12, resulting in better suppression of lateral leakage. Simultaneously, the two fourth side 19s ensure continuous cathode formation, further reducing cathode load. Moreover, each first opening 5 is surrounded by a ring of second openings 6, providing better leakage protection for each sub-pixel and significantly improving the reduction of sub-pixel overexposure.

[0085] In some implementations, the width L8 of the second top surface 20 of the first pixel definition layer 3 between two adjacent second openings 6 can be greater than or equal to 5 μm.

[0086] In some embodiments, the side of the second opening 6 closest to the first opening 5 is designated as the second side 10. This arrangement shortens the lateral distance from the subpixel to the second side 10, creating leakage protection closer to the subpixel and more effectively suppressing lateral leakage from spreading into the subpixel.

[0087] In some implementations, combined again Figures 1A-3 , Figures 5A-7 , Figures 8A-10 At least part of the first opening 5 is surrounded by the second side 10, and in the circumferential direction of the first opening 5, the second side 10 surrounding the first opening 5 is exposed by the second pixel definition layer 4 at the first position a and covered by the second pixel definition layer 4 at the second position b.

[0088] The annotations for the first position 'a' and the second position 'b' can be found in [reference needed]. Figure 1D , Figure 5D and Figure 8D , Figure 1D , Figure 5D , Figure 8D The portion of the first pixel definition layer 3 shown can correspond to the position where the first top surface 14 is exposed by the second pixel definition layer 4, or the position where the second side surface 10 is exposed by the second pixel definition layer 4. This portion of the first pixel definition layer 3 is located at the first position a. The break in this portion of the first pixel definition layer 3 can correspond to the position where the first top surface 14 is covered by the second pixel definition layer 4, or the position where the second side surface 10 is covered by the second pixel definition layer 4. The break position is located at the second position b.

[0089] In this structure, the second side 10 surrounding the first opening 5 is designed with circumferential differences: the second side 10 is exposed by the second pixel definition layer 4 at the first position a to form a partition area of ​​the functional layer 12, and the second side 10 is covered by the second pixel definition layer 4 at the second position b to support the continuous deposition of the cathode 13, so that the cathode 13 forms a continuous structure at that position. This design not only achieves multi-directional suppression of lateral leakage, but also helps to achieve full-surface connectivity of the cathode and helps to reduce the cathode load.

[0090] It should be noted that in this embodiment of the invention, the cathode 13 is a fully connected structure. For example, see again... Figure 1D , Figure 5D and Figure 8D The cathode portion corresponding to each sub-pixel will form a continuous path with the surrounding cathode portion at the second position b, making the entire cathode surface connected.

[0091] Furthermore, in order to achieve a balance between cathode continuity and the blocking effect of functional layer 12, the number of second positions b is greater than or equal to 1 and less than or equal to 4.

[0092] In some implementations, the number of second positions b corresponding to different color sub-pixels can be different. For example, the second opening 6 surrounding the blue pixel unit 23 will encircle two blue sub-pixels P3, and its extension path is longer, so the number of second positions b can be set to be more.

[0093] In some implementations... Figure 11 This is a schematic diagram of a second position provided in an embodiment of the present invention. Figure 12 This is another schematic diagram of the second position provided in an embodiment of the present invention. Figure 13 Another schematic diagram of the second position provided in the embodiment of the present invention, as shown below. Figures 11-13 As shown, the second position b corresponding to the adjacent first opening 5 is not directly opposite in the arrangement direction of the adjacent first opening 5.

[0094] This configuration avoids the formation of a continuous leakage path in the functional layer 12 in the area directly opposite adjacent sub-pixels. On the other hand, it enables the continuity of the cathode path in multiple directions, allowing the cathode signal in different directions to perform well. It also avoids the formation of stress concentration points in the cathode 13 in a specific direction.

[0095] In this embodiment of the invention, at least a portion of the second position b may be located on one side of the straight edge of its corresponding first opening 5. For example, participating Figure 11 The second position b corresponding to the red first opening 5-R is located on one side of its horizontal edge, the second position b corresponding to the green first opening 5-G is located on one side of its vertical edge, and at least part of the second position b corresponding to the blue first opening 5-B is located on one side of its horizontal edge.

[0096] And / or, at least part of the second position b may be located at the junction of its corresponding first opening 5 and the corner. For example, see Figure 13 The second position b corresponding to the first red opening 5-R is located at the junction of its straight side and the corner.

[0097] And / or, at least part of the second position b may be located at the corner of its corresponding first opening 5. For example, see Figure 12 The second position b corresponding to the first red opening 5-R is located at its corner, and the second position b corresponding to the first green opening 5-G is located at the corner.

[0098] In some implementations, see again Figure 3 , Figure 7 and Figure 9 The thickness of the first pixel definition layer 3 is h1, and the thickness of the second pixel definition layer 4 located on the side of the first pixel definition layer 3 away from the substrate 1 is h2, where h1 > h2.

[0099] Compared to the second pixel definition layer 4, the first pixel definition layer 3 takes into account both the blocking and anti-reflection functions of the functional layer 12. The thickness of the first pixel definition layer 3 is set to be greater, which not only ensures its strong light-blocking ability, but also allows the second side 10 to have a larger vertical height, making the break of the functional layer 12 large enough in the vertical direction, and preventing the functional layer 12 from being continuous at the second side 10 to a greater extent.

[0100] In some implementations, see again Figure 3 , Figure 7 and Figure 9 The thickness h1 of the first pixel definition layer 3 is greater than or equal to 0.8 μm, and the thickness h2 of the second pixel definition layer 4 located on the side of the first pixel definition layer 3 away from the substrate 1 is greater than or equal to 0.3 μm.

[0101] When h1 is within the aforementioned range, the first pixel definition layer 3 has sufficient thickness, which firstly provides strong light-shielding capability, and secondly ensures that the break in the functional layer 12 is large enough in the vertical direction to prevent continuity of the functional layer 12 at the second side 10. When h2 is within the aforementioned range, the second pixel definition layer 4 is sufficient to cover the first side 9 and achieve a strong protective effect.

[0102] It should be noted that the shapes and arrangements of the sub-pixels shown in the accompanying drawings of the embodiments of the present invention are for illustrative purposes only. In the embodiments of the present invention, the sub-pixels can have various shapes and arrangements.

[0103] For example, see Figures 1A-1D , Figures 5A-5D , Figures 8A-8DSubpixels can be square. Or, Figure 14A This is yet another top view of the first pixel definition layer and the second pixel definition layer provided in an embodiment of the present invention. Figure 14B for Figure 14A A schematic diagram of the portion of the first pixel definition layer exposed by the second pixel definition layer. Figure 15A This is yet another top view of the first pixel definition layer and the second pixel definition layer provided in an embodiment of the present invention. Figure 15B for Figure 15A A schematic diagram of the portion of the first pixel definition layer exposed by the second pixel definition layer. Figure 16A This is yet another top view of the first pixel definition layer and the second pixel definition layer provided in an embodiment of the present invention. Figure 16B for Figure 16A A schematic diagram of the portion of the first pixel definition layer exposed by the second pixel definition layer, as shown below. Figures 14A-16B As shown, subpixels can also be circular. When subpixels are circular, they have no sharp corners, which can improve light diffraction and effectively suppress dispersion caused by ambient light incidence, making them more suitable for panel architectures with depolarizer designs.

[0104] Based on the same inventive concept, embodiments of the present invention also provide a display device. Figure 17 This is a schematic diagram of a display device provided in an embodiment of the present invention, such as... Figure 17 As shown, the display device includes the aforementioned display panel 100. Of course, Figure 17 The display device shown is for illustrative purposes only. The display device can be any electronic device with display function, such as a mobile phone, tablet computer, laptop computer, e-reader or television.

[0105] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the scope of protection of the present invention.

[0106] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, and not to limit them. Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features therein. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present invention.

Claims

1. A display panel, characterized in that, include: Substrate; The anode is located on one side of the substrate; A first pixel definition layer and a second pixel definition layer are provided. The first pixel definition layer is located on the side of the anode away from the substrate, and the second pixel definition layer is located on the side of the first pixel definition layer away from the substrate. The transmittance of the first pixel definition layer is less than that of the second pixel definition layer. The first pixel definition layer includes a first opening and a second opening. In a direction perpendicular to the plane of the substrate, the first opening at least partially overlaps with the anode, and at least partially adjacent first openings are spaced apart by the second opening. The width of the first opening near the substrate is greater than the width away from the substrate, and the width of the second opening near the substrate is greater than the width away from the substrate. The second pixel definition layer includes a third opening and a fourth opening. In a direction perpendicular to the plane of the substrate, the third opening at least partially overlaps with the anode and is located within the first opening. The width of the third opening near the substrate is less than the width away from the substrate. The side of the first opening is a first side surface, which is covered by the second pixel definition layer. In a direction perpendicular to the plane of the substrate, the fourth opening overlaps with the second opening. The second opening includes a second side surface, which is exposed by the second pixel definition layer at at least a portion of its position. The light-emitting layer is located at the third opening; A functional layer is located at the third opening and on the side of the second pixel definition layer away from the substrate; The cathode is located on the side of the functional layer away from the substrate.

2. The display panel according to claim 1, characterized in that, The first pixel definition layer includes a negative photoresist material.

3. The display panel according to claim 1, characterized in that, The first opening and the second opening penetrate the first pixel definition layer; The angle between the side of the first opening and the surface of the first pixel definition layer that is in contact with it and is close to the substrate is the first angle, and the angle between the side of the second opening and the surface of the first pixel definition layer that is in contact with it and is close to the substrate is the second angle. Both the first angle and the second angle are greater than 90°, and the first angle and the second angle are equal.

4. The display panel according to claim 1, characterized in that, The first pixel definition layer includes a first top surface that is in contact with the second side surface, at least a portion of the first top surface is exposed by the second pixel definition layer, and the portions of the first top surface and the second side surface exposed by the second pixel definition layer are continuous.

5. The display panel according to claim 4, characterized in that, The width of the first top surface exposed by the second pixel definition layer is greater than or equal to 1 μm.

6. The display panel according to claim 4, characterized in that, The first pixel definition layer includes a first sub-part, which is spaced between adjacent first openings and second openings, and the first sub-part includes a first side surface, a second side surface, and a first top surface; The width of the first top surface in the first sub-part is greater than or equal to 3 μm; and / or, the width of the first top surface in the first sub-part covered by the second pixel definition layer is greater than or equal to 3 μm.

7. The display panel according to claim 1, characterized in that, The first pixel definition layer includes a first bottom surface that is connected to the second side surface, and the angle between the second side surface and the first bottom surface is α1, where 110°≤α1≤145°.

8. The display panel according to claim 1, characterized in that, The minimum width of the second opening is greater than or equal to 3 μm.

9. The display panel according to claim 1, characterized in that, The second pixel definition layer includes a third side surface and a second bottom surface located at the first opening, and the angle between the third side surface and the second bottom surface is α2, where α2 ≤ 40°.

10. The display panel according to claim 1, characterized in that, The second pixel definition layer includes a third side located at the first opening; The distance between the orthographic projection of the edge of the first side away from the substrate on the substrate and the orthographic projection of the edge of the adjacent third side near the substrate on the substrate is greater than or equal to 1 μm.

11. The display panel according to claim 1, characterized in that, At least a portion of the second opening also includes a fourth side opposite to the second side, the fourth side being covered by the second pixel definition layer; The second pixel definition layer includes a fifth side surface and a third bottom surface located at the second opening, and the angle between the fifth side surface and the third bottom surface is α3, where α3 < 90°.

12. The display panel according to claim 11, characterized in that, α3≤40°。 13. The display panel according to claim 11, characterized in that, The distance between the orthographic projection of the edge of the fourth side away from the substrate on the substrate and the orthographic projection of the edge of the adjacent fifth side near the substrate on the substrate is greater than or equal to 1 μm.

14. The display panel according to claim 11, characterized in that, The distance between the orthographic projection of the edge of the second side away from the substrate on the substrate and the orthographic projection of the edge of the adjacent fifth side near the substrate on the substrate is greater than or equal to 2 μm.

15. The display panel according to claim 11, characterized in that, The first pixel definition layer also includes a second top surface that is connected to the fourth side surface, and the width of the second top surface covered by the second pixel definition layer is greater than or equal to 3μm.

16. The display panel according to claim 1, characterized in that, At least partially adjacent to the first opening are separated by only one second opening.

17. The display panel according to claim 16, characterized in that, Along the arrangement direction of adjacent first openings, there are two second side surfaces spaced apart between adjacent first openings.

18. The display panel according to claim 16, characterized in that, Along the arrangement direction of adjacent first openings, there is only one second side between adjacent first openings.

19. The display panel according to claim 18, characterized in that, The light-emitting layer includes a red light-emitting layer and a non-red light-emitting layer; The first opening includes a first sub-opening and a second sub-opening. In a direction perpendicular to the plane of the substrate, the first sub-opening overlaps with the red light-emitting layer, and the second sub-opening overlaps with the non-red light-emitting layer. The distance between the second opening and the first sub-opening is less than the distance between the second opening and the second sub-opening, and / or, the side of the second opening closer to the first sub-opening is the second side.

20. The display panel according to claim 1, characterized in that, At least two second openings are spaced apart between each of the adjacent first openings. Along the arrangement direction of the adjacent first openings, two second side surfaces are spaced apart between each of the adjacent first openings, and the two second side surfaces are the side surfaces of the two second openings, respectively.

21. The display panel according to claim 20, characterized in that, The side of the second opening closest to the first opening is the second side.

22. The display panel according to claim 1, characterized in that, At least a portion of the first opening is surrounded by the second side. In the circumferential direction of the first opening, the second side surrounding the first opening is exposed by the second pixel definition layer at a first position and covered by the second pixel definition layer at a second position.

23. The display panel according to claim 22, characterized in that, The number of the second position is greater than or equal to 1 and less than or equal to 4.

24. The display panel according to claim 22, characterized in that, The second position corresponding to the adjacent first opening is not directly opposite to the first opening in the arrangement direction of the adjacent first opening.

25. The display panel according to claim 1, characterized in that, The light-emitting layer includes a first light-emitting layer and a second light-emitting layer; The functional layer includes a charge generation layer, which is located between the first light-emitting layer and the second light-emitting layer within the third opening.

26. The display panel according to claim 1, characterized in that, The thickness of the first pixel definition layer is h1, and the thickness of the second pixel definition layer located on the side of the first pixel definition layer away from the substrate is h2, where h1 > h2.

27. The display panel according to claim 1, characterized in that, The thickness of the first pixel definition layer is greater than or equal to 0.8 μm, and the thickness of the second pixel definition layer located on the side of the first pixel definition layer away from the substrate is greater than or equal to 0.3 μm.

28. A display device, characterized in that, Includes the display panel as described in any one of claims 1 to 27.

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