Display panel and display device

Abstract

The utility model provides a display panel and a display device, relates to the technical field of display, and is used for solving the problem that residual images exist in pictures displayed by a display product and have negative effects on the display effect and reliability of the display product. In the display panel, a pixel defining layer comprises defining parts, the defining parts are located between adjacent pixel opening areas, and grooves are formed in the surfaces, opposite to a substrate, of the defining parts; the partition structure is located in the groove, a first notch is formed in the side face of the partition structure, and a cavity is formed between the first notch and the groove wall of the groove; a second notch is formed in the inner side face, facing the pixel opening area, of the pixel defining layer, and the distance between the top, away from the substrate, of the second notch and the substrate is larger than the distance between the top, away from the substrate, of the first notch and the substrate; the light-emitting functional layer comprises a part located in the pixel opening area and a part located outside the pixel opening area, and the part located outside the pixel opening area is at least partially separated at the position of the cavity.

Description

Technical Field

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

[0002] With the continuous development of display technology, the application fields of display products are becoming increasingly wide, and correspondingly, consumers have increasingly higher requirements for the display quality of display products. However, in current display products, electrical signals are transmitted along the functional film layer to the non-aperture area located between the aperture areas of adjacent pixels. This can cause image retention problems in the displayed image, thus negatively affecting the display effect and reliability of the display product. Utility Model Content

[0003] The purpose of this utility model is to provide a display panel and display device to solve the problem of image retention in the display product, which negatively affects the display effect and reliability of the display product.

[0004] To achieve the above objectives, this utility model provides the following technical solution:

[0005] The first aspect of this utility model provides a display panel, comprising:

[0006] A substrate and a pixel defining layer disposed on the substrate, the pixel defining layer defining a plurality of pixel opening regions, the pixel defining layer including defining portions located between adjacent pixel opening regions, the defining portions having trenches on the surface of the defining portions facing away from the substrate.

[0007] A partition structure is located within the trench. The partition structure has a first notch on its side, and a cavity is formed between the first notch and the trench wall. The inner side of the pixel defining layer facing the pixel opening area has a second notch, and the distance between the second notch and the top of the substrate is greater than the distance between the first notch and the top of the substrate.

[0008] The light-emitting functional layer includes a portion located within the pixel opening area and a portion located outside the pixel opening area. The portion located within the pixel opening area is at least partially separated at the second notch, and the portion located outside the pixel opening area is at least partially separated at the cavity.

[0009] Optionally, the partition structure includes a first side and a second side, the first side and the second side facing each other along a direction intersecting the extension direction of the partition structure, a first cavity is formed between a first notch on the first side and its opposite groove wall, and a second cavity is formed between a first notch on the second side and its opposite groove wall.

[0010] Optionally, the first cavity extends along the extension direction of the boundary of its adjacent pixel opening region; and / or, the second cavity extends along the extension direction of the boundary of its adjacent pixel opening region.

[0011] Optionally, at least a portion of the pixel opening area is surrounded by the first notch.

[0012] Optionally, in a direction perpendicular to the extension direction of the partition structure, the cross-section of the partition structure in a direction perpendicular to the substrate is an inverted trapezoid.

[0013] Optionally, in the direction perpendicular to the extension direction of the partition structure, the cross-section of the trench wall in the direction perpendicular to the substrate is an inverted trapezoid.

[0014] Optionally, the included angle a1 formed between the side surface of the partition structure and the bottom surface of the groove satisfies: a1≤70°.

[0015] Optionally, the slope angle a2 of the trench wall satisfies: 45°≤a2≤70°.

[0016] Optionally, the length of the bottom edge L1 of the inverted trapezoidal section of the partition structure and the length of the top edge L2 of the inverted trapezoidal section of the partition structure satisfy: L1≤(4 / 5)L2.

[0017] Optionally, L2-L1>L3, where L3 is the depth of the second notch.

[0018] Optionally, the orthographic projection of the defining portion on the substrate and the orthographic projection of the anode pattern in the display panel on the substrate have an overlapping area, the width of which is less than L1.

[0019] Optionally, the partition structure has a first thickness d1 in a direction perpendicular to the substrate, satisfying: d1≤(1 / 2)d2, where d2 is the depth of the trench.

[0020] Optionally, the distance between the orthographic projection of the partition structure on the substrate and the orthographic projection of the trench wall on the substrate is greater than or equal to 0.

[0021] Optionally, the light-emitting functional layer forms at least two stacked light-emitting units, and the light-emitting functional layer further includes a charge-generating sub-film layer located between adjacent light-emitting units. The charge-generating sub-film layer and all sub-film layers located between the charge-generating sub-film layer and the partition structure are partitioned at the cavity.

[0022] Optionally, the partition structure includes an inorganic partition structure.

[0023] Optionally, the display panel further includes:

[0024] A driving circuit layer is located between the substrate and the pixel defining layer, and the driving circuit layer includes sub-pixel driving circuits distributed in an array.

[0025] An anode layer comprising multiple anode patterns, each anode pattern being coupled to a corresponding sub-pixel driving circuit; the orthographic projection of the pixel opening region on the substrate lies within the orthographic projection of the corresponding anode pattern on the substrate.

[0026] The light-emitting functional layer includes a white light-emitting functional layer, and the portion of the white light-emitting functional layer located within the pixel opening area is in contact with the corresponding anode pattern.

[0027] A cathode layer, wherein the cathode layer is located on the side of the light-emitting functional layer opposite to the substrate;

[0028] An encapsulation layer is located on the side of the cathode layer facing away from the substrate.

[0029] A color filter layer, wherein the color filter layer is located on the side of the encapsulation layer opposite to the substrate.

[0030] Based on the above-described display panel technical solution, a second aspect of this utility model provides a display device including the above-described display panel.

[0031] Based on the above-described technical solution for the display panel, a third aspect of this utility model provides a method for manufacturing a display panel, the method comprising:

[0032] Fabricate a pixel-defining material layer on a substrate;

[0033] A patterning process is performed on the pixel defining material layer to form a pixel defining layer. The pixel defining layer defines a plurality of pixel opening regions. The pixel defining layer includes a defining portion located between adjacent pixel opening regions. The surface of the defining portion facing away from the substrate has a trench. The inner side of the pixel defining layer facing the pixel opening region has a second notch.

[0034] A partition structure is fabricated within the trench, the side of the partition structure having a first notch, and a cavity is formed between the first notch and the trench wall; the distance between the second notch and the top of the substrate is greater than the distance between the first notch and the top of the substrate.

[0035] A light-emitting functional layer is fabricated, the light-emitting functional layer including a portion located within the pixel opening area and a portion located outside the pixel opening area, the portion located within the pixel opening area being at least partially separated at the second notch, and the portion located outside the pixel opening area being at least partially separated at the cavity. Attached Figure Description

[0036] The accompanying drawings, which are included to provide a further understanding of the present invention and constitute a part of this invention, illustrate exemplary embodiments of the present invention and, together with the description thereof, serve to explain the present invention and do not constitute an undue limitation thereof. In the drawings:

[0037] Figure 1 A schematic diagram showing that a groove is formed on the back side of the pixel defining layer provided in an embodiment of the present invention;

[0038] Figure 2 for Figure 6 A schematic diagram of the cross-section along the A1A2 direction;

[0039] Figure 3 for Figure 2 Schematic diagram of the dimensions and angles of each structure in the diagram;

[0040] Figure 4 This is a first schematic diagram of the partition structure that isolates the light-emitting functional layer according to an embodiment of the present utility model;

[0041] Figure 5 This is a second schematic diagram of the partition structure that isolates the light-emitting functional layer according to an embodiment of the present utility model;

[0042] Figure 6 A top view schematic diagram of the pixel opening area, pixel defining layer, and partition structure provided in an embodiment of this utility model;

[0043] Figure 7 This is a comparison diagram showing the effect of image retention improvement in related technologies and the technical solutions provided in the embodiments of this utility model. Detailed Implementation

[0044] To further illustrate the display panel and display device provided in the embodiments of this utility model, a detailed description is provided below with reference to the accompanying drawings.

[0045] Please see Figures 1 to 6This utility model embodiment provides a display panel, including:

[0046] A substrate and a pixel defining layer PDL disposed on the substrate, the pixel defining layer PDL defining a plurality of pixel opening regions K1, the pixel defining layer PDL including a defining portion 10, the defining portion 10 being located between adjacent pixel opening regions K1, the surface of the defining portion 10 facing away from the substrate having a trench 101.

[0047] A partition structure 20 is located within the trench 101. The partition structure 20 has a first notch O1 on its side, and a cavity (e.g., a first cavity 301 and a second cavity 302) is formed between the first notch O1 and the trench wall of the trench 101. The inner side of the pixel defining layer PDL facing the pixel opening region K1 has a second notch O2. The distance between the top of the second notch O2 and the substrate is greater than the distance between the top of the first notch O1 and the substrate.

[0048] The light-emitting functional layer 40 includes a portion located within the pixel opening region K1 and a portion located outside the pixel opening region K1. The portion located within the pixel opening region K1 is at least partially blocked at the second notch O2, and the portion located outside the pixel opening region K1 is at least partially blocked at the cavity. It should be noted that... Figure 4 The diagram illustrates that the portion located outside the pixel opening region K1 is partially separated at the cavity. Figure 5 The diagram illustrates that the portion located outside the pixel opening region K1 is completely isolated in the cavity.

[0049] For example, the display panel further includes a driving circuit layer located between the substrate and the pixel delimiting layer (PDL), the driving circuit layer including an array of sub-pixel driving circuits; the display panel further includes an anode layer including a plurality of anode patterns Ano, the anode patterns Ano being coupled to corresponding sub-pixel driving circuits; the pixel delimiting layer (PDL) defines a plurality of pixel opening regions K1 arranged in an array, the orthographic projection of the pixel opening region K1 on the substrate being located inside the orthographic projection of the corresponding anode pattern Ano on the substrate.

[0050] For example, the light-emitting functional layer 40 includes a white light-emitting functional layer, and the portion of the white light-emitting functional layer located within the pixel opening region K1 is in contact with the corresponding anode pattern Ano; the display panel also includes a cathode layer 50, which is located on the side of the light-emitting functional layer 40 facing away from the substrate.

[0051] For example, the display substrate includes a plurality of sub-pixels. Each sub-pixel includes a sub-pixel driving circuit and a light-emitting element. The light-emitting element includes an anode pattern Ano coupled to the sub-pixel driving circuit, a white light-emitting functional layer 40 in contact with the anode pattern Ano, and a cathode layer 50 in contact with the white light-emitting functional layer 40. The sub-pixel driving circuit is coupled to the anode of the light-emitting element and is used to provide a driving signal to the light-emitting element to drive it to emit light.

[0052] For example, the plurality of sub-pixel driving circuits included in the plurality of sub-pixel pixels are arranged in an array. The plurality of sub-pixel driving circuits are divided into multiple rows of sub-pixel driving circuits and multiple columns of sub-pixel driving circuits. The multiple rows of sub-pixel driving circuits are arranged along a second direction, and each row of sub-pixel driving circuits includes a plurality of sub-pixel driving circuits arranged along a first direction. The multiple columns of sub-pixel driving circuits are arranged along the first direction, and each column of sub-pixel driving circuits includes a plurality of sub-pixel driving circuits arranged along a second direction. For example, the first direction intersects with the second direction. For example, the first direction includes a horizontal direction, and the second direction includes a vertical direction.

[0053] For example, the pixel opening region K1 defined by the pixel defining layer PDL can have a variety of shapes, such as quadrilateral, hexagon, circle, etc., but is not limited to these.

[0054] For example, the pixel defining layer PDL includes a defining portion 10, which serves as a portion of the pixel defining layer PDL used to define a pixel opening region K1, and its side surface facing the pixel opening region K1 can serve as the boundary of the pixel opening region K1.

[0055] For example, the defining portion 10 is located between adjacent pixel opening regions K1, and the surface of the defining portion 10 facing away from the substrate has a groove 101; the groove 101 does not penetrate the defining portion 10 in a direction perpendicular to the substrate. The partition structure 20 is located within the groove 101, and the side of the partition structure 20 has a first notch O1. A cavity is formed between the first notch O1 and the groove wall of the groove 101. The cavity has an opening, which is formed between the edge of the surface of the partition structure 20 facing away from the substrate and the groove wall.

[0056] For example, the light-emitting functional layer 40 includes a portion located within the pixel opening region K1 and a portion located outside the pixel opening region K1. The portion located within the pixel opening region K1 is used to realize the light-emitting function of its subordinate sub-pixel, and the portion located outside the pixel opening region K1 is at least partially blocked at the cavity. It is worth noting that the light-emitting functional layer 40 includes multiple sub-film layers stacked together, among which at least one organic light-emitting material layer is included. The at least partially blocked sub-film layer includes a film layer with carrier transport function located on the side of the organic light-emitting material layer facing the substrate.

[0057] For example, the display panel further includes an encapsulation layer located on the side of the cathode layer 50 facing away from the substrate; the display panel further includes a color filter layer located on the side of the encapsulation layer facing away from the substrate. The display panel also includes a cover plate located on the side of the color filter layer facing away from the substrate.

[0058] For example, the manufacturing process of the display panel with the above structure is as follows: First, a pixel defining layer (PDL) is fabricated. Then, a partition structure 20 is fabricated in the trench 101 formed by the pixel defining layer (PDL). A cavity is formed between the first notch O1 on the side of the partition structure 20 and the trench wall of the trench 101. Next, a light-emitting functional layer 40 is fabricated. The portion of the light-emitting functional layer 40 located outside the pixel opening area K1 is at least partially partitioned in the cavity. Finally, a cathode layer 50, an encapsulation layer, a planarization layer, a color filter layer, a cover plate, etc., are sequentially fabricated on the side of the light-emitting functional layer 40 facing away from the substrate to form a complete display panel.

[0059] As can be seen from the specific structure of the display panel described above, in the display panel provided by this embodiment of the present invention, a trench 101 is provided on the surface of the pixel defining layer PDL facing away from the substrate, and a partition structure 20 is provided in the trench 101, so that a cavity is formed between the first notch O1 on the side of the partition structure 20 and the trench wall of the trench 101. In this way, in the subsequently formed light-emitting functional layer 40, the portion located outside the pixel opening area K1 can be at least partially isolated at the cavity, thereby cutting off the path of horizontal (i.e., parallel to the substrate) transmission of electrical signals between adjacent pixel opening areas K1. At the same time, the inner side of the pixel defining layer facing the pixel opening area is provided with a second notch O2, so that the portion located inside the pixel opening area K1 can be at least partially isolated at the second notch O2, further cutting off the path of horizontal transmission of electrical signals between adjacent pixel opening areas K1. Furthermore, by setting the distance between the top of the second notch O2 and the substrate away from the substrate to be greater than the distance between the top of the first notch O1 and the substrate away from the substrate, a step difference is formed between the tops of the second notch O2 and the first notch O1, thereby better ensuring that the light-emitting functional layer 40 can be at least partially isolated at the inner edge and outer edge of the pixel opening area K1. Therefore, in the display panel provided by this embodiment, while maintaining the light-emitting effect of independent sub-pixels, the isolation effect is optimized, the problem of horizontal transmission of electrical signals emitted from the anode layer is solved, thereby solving the problem of image retention in the displayed image and effectively improving the display effect and reliability of the display product.

[0060] More specifically, such as Figure 7 As shown, Figure 7 The first line shows the improvement effect of the related technology on image retention, indicating that image retention problems still exist. Figure 7 The second line shows the effect of the present invention on the improvement of image retention. It can be seen that the technical solution provided by the present invention eliminates image retention.

[0061] like Figures 1 to 6 As shown, in some embodiments, the partition structure 20 includes a first side and a second side, the first side and the second side facing each other along a direction intersecting the extension direction of the partition structure 20, a first cavity 301 is formed between the first recess O1 of the first side and its opposite groove wall, and a second cavity 302 is formed between the first recess O1 of the second side and its opposite groove wall.

[0062] For example, the first cavity 301 extends along the extension direction of the boundary of its adjacent pixel opening region K1; and / or, the second cavity 302 extends along the extension direction of the boundary of its adjacent pixel opening region K1.

[0063] For example, at least a portion of the pixel opening region K1 is surrounded by the first notch O1.

[0064] The aforementioned arrangement forms cavities on both sides of the partition structure 20, which can further cut off the path of horizontal transmission of electrical signals between adjacent pixel opening areas K1, thereby further optimizing the partition effect, solving the problem of image retention in the display panel, and effectively improving the display effect and reliability of the display product.

[0065] like Figures 1 to 6 As shown, in some embodiments, the partition structure 20 has an inverted trapezoidal cross section in the direction perpendicular to the extension direction of the partition structure 20.

[0066] The above-mentioned arrangement not only forms the first notch O1 on the side of the partition structure 20, but also ensures that a sufficiently large cavity is formed between the partition structure 20 and the groove wall, thus ensuring the isolation effect of the cavity on the light-emitting functional layer 40.

[0067] like Figures 1 to 6 As shown, in some embodiments, in a direction perpendicular to the extension direction of the partition structure 20, the cross-section of the trench wall of the trench 101 in a direction perpendicular to the substrate is an inverted trapezoid.

[0068] The above configuration ensures that a sufficiently large cavity is formed between the partition structure 20 and the groove wall, thus ensuring the cavity's isolation effect on the light-emitting functional layer 40.

[0069] like Figure 3 As shown, in some embodiments, the included angle α1 formed between the side surface of the partition structure 20 and the bottom surface of the groove 101 satisfies: α1 ≤ 70°.

[0070] For example, the included angle a1 can take values ​​of 45°, 50°, 55°, 60°, 65°, and 70°, but is not limited to these.

[0071] The above setting a1≤70° ensures that the cavity is large enough, thereby better protecting the cavity's isolation effect on the light-emitting functional layer 40.

[0072] like Figure 3 As shown, in some embodiments, the slope angle a2 of the trench wall satisfies: 45°≤a2≤70°.

[0073] For example, the slope angle a2 can take values ​​of 45°, 50°, 55°, 60°, 65°, and 70°, but is not limited to these.

[0074] The above setting of 45°≤a2≤70° ensures that the cavity is large enough, thereby better guaranteeing the cavity's isolation effect on the light-emitting functional layer 40.

[0075] like Figure 3 As shown, in some embodiments, the length of the bottom edge L1 of the inverted trapezoidal section of the partition structure 20 and the length of the top edge L2 of the inverted trapezoidal section of the partition structure 20 satisfy: L1≤(4 / 5)L2.

[0076] For example, the length L1 of the bottom edge of the inverted trapezoidal section of the partition structure 20 can take the following values: (1 / 2)L2, (2 / 3)L2, (3 / 5)L2, (4 / 5)L2, but is not limited to these.

[0077] The above setting L1≤(4 / 5)L2 can avoid the requirement that the included angle a1 cannot meet the requirement of being less than or equal to 70° due to process issues.

[0078] In some embodiments, L2-L1 > L3, where L3 is the depth of the recess in the second notch O2.

[0079] For example, (L2-L1) / 2 > L3, but it is not limited to this.

[0080] The above configuration can better ensure that the light-emitting functional layer 40 is at least partially isolated at the inner edge of the pixel opening area K1 and the outer edge of the pixel opening area K1. This optimizes the isolation effect while maintaining the light-emitting effect of independent sub-pixels, solves the problem of horizontal transmission of electrical signals emitted by the anode layer, and thus solves the problem of image retention in the display panel, effectively improving the display effect and reliability of the display product.

[0081] In some embodiments, the orthographic projection of the defining portion 10 on the substrate and the orthographic projection of the anode pattern Ano in the display panel on the substrate have an overlapping region, the width of which is less than L1. This arrangement is beneficial for improving the pixel aperture ratio.

[0082] like Figure 3 As shown, in some embodiments, the partition structure 20 has a first thickness d1 in a direction perpendicular to the substrate, satisfying: d1≤(1 / 2)d2, where d2 is the depth of the trench 101.

[0083] For example, the first thickness d1 can take the values ​​of (1 / 2)d2, (1 / 3)d2, and (1 / 4)d2, but is not limited to these.

[0084] The above setting d1≤(1 / 2)d2 can prevent the subsequently fabricated cathode layer 50 from falling into the cavity, thus avoiding the problem of increased IR drop caused by puncture of the cathode layer 50.

[0085] In some embodiments, the distance between the orthographic projection of the partition structure 20 on the substrate and the orthographic projection of the trench wall of the trench 101 on the substrate is greater than or equal to 0.

[0086] For example, the orthographic projection of the partition structure 20 on the substrate does not overlap with the orthographic projection of the trench wall of the trench 101 on the substrate.

[0087] The above arrangement ensures that the cavity formed between the first notch O1 on the side of the partition structure 20 and the groove wall of the groove 101 has a suitable accommodating space, which can ensure that the part located outside the pixel opening area K1 can be at least partially isolated in the cavity, thereby cutting off the path of horizontal transmission of electrical signals between adjacent pixel opening areas K1.

[0088] like Figure 4 As shown, in some embodiments, the light-emitting functional layer 40 forms at least two stacked light-emitting units, and the light-emitting functional layer 40 further includes a charge-generating sub-film layer CGL located between adjacent light-emitting units. The charge-generating sub-film layer CGL and all sub-film layers located between the charge-generating sub-film layer CGL and the partition structure 20 are separated in the cavity.

[0089] For example, the light-emitting functional layer 40 forms a first light-emitting unit 401 and a second light-emitting unit 402 stacked together. The first light-emitting unit 401 is located between the second light-emitting unit 402 and the substrate. The light-emitting functional layer 40 includes a charge-generating sub-film layer CGL, which is located between the first light-emitting unit 401 and the second light-emitting unit 402. The charge-generating sub-film layer CGL, and all the sub-film layers of the first light-emitting unit 401 located between the charge-generating sub-film layer CGL and the partition structure 20, are all isolated at the cavity.

[0090] For example, the light-emitting unit may include, but is not limited to, an electron injection sub-film layer, an electron transport sub-film layer, a first light-emitting material sub-film layer, a hole transport sub-film layer, and a hole injection sub-film layer, which are sequentially stacked along a direction away from the substrate.

[0091] The aforementioned configuration isolates the charge-generating sub-film layer CGL and all sub-film layers located between the charge-generating sub-film layer CGL and the isolation structure 20 at the cavity, cutting off the path for horizontal transmission of electrical signals along the charge-generating sub-film layer CGL and all sub-film layers located between the charge-generating sub-film layer CGL and the isolation structure 20. This solves the problem of image retention in the display panel and effectively improves the display effect and reliability of the display product.

[0092] In some embodiments, the partition structure 20 includes an inorganic partition structure.

[0093] The aforementioned partition structure 20 includes an inorganic partition structure, which enables the partition structure 20 to have insulating properties. While achieving the partition function, it can prevent short circuits between the partition structure and other conductive structures in the display panel, thus improving the reliability of the display panel.

[0094] like Figures 1 to 6 As shown, in some embodiments, the inner side of the pixel defining layer PDL facing the pixel opening region K1 has a second notch O2.

[0095] For example, the light-emitting functional layer 40 located at the edge of the pixel opening region K1 is partially blocked at the second notch O2; or, the light-emitting functional layer 40 located at the edge of the pixel opening region K1 is completely blocked at the second notch O2.

[0096] For example, the inner side of the pixel defining layer PDL facing the pixel opening region K1 adopts an inner undercut structure, which forms the second notch O2.

[0097] The pixel defining layer PDL described above has a second notch O2 on its inner side facing the pixel opening area K1. This notch O2 can block the light-emitting functional layer 40 at the edge of the pixel opening area K1, so that the electrical signal emitted by the anode pattern Ano is transmitted only in the vertical direction, preventing the electrical signal from being transmitted horizontally along the light-emitting functional layer 40 between adjacent sub-pixel opening areas K1, thereby enabling the independent operation of each light-emitting element.

[0098] In the display panel provided in the above embodiment, an inner undercut structure is formed simultaneously, and a cavity is formed between the first notch O1 on the side of the partition structure 20 and the groove wall of the groove 101. This allows the inner undercut structure to have limited partitioning function, i.e., the inner undercut structure cannot completely partition the sub-film layer that needs to be partitioned. The cavity can further cut off the path of horizontal transmission of electrical signals between adjacent pixel opening areas K1, thereby further optimizing the partitioning effect, solving the problem of image retention in the display panel, and effectively improving the display effect and reliability of the display product.

[0099] In some embodiments, the display panel further includes:

[0100] A driving circuit layer is located between the substrate and the pixel defining layer (PDL), and the driving circuit layer includes sub-pixel driving circuits distributed in an array.

[0101] An anode layer comprising a plurality of anode patterns Ano, wherein the anode pattern Ano is coupled to a corresponding sub-pixel driving circuit; the orthographic projection of the pixel opening region K1 on the substrate is located inside the orthographic projection of the corresponding anode pattern Ano on the substrate;

[0102] The light-emitting functional layer 40 includes a white light-emitting functional layer 40, and the portion of the white light-emitting functional layer 40 located within the pixel opening region K1 is in contact with the corresponding anode pattern Ano.

[0103] A cathode layer 50 is located on the side of the light-emitting functional layer 40 that faces away from the substrate.

[0104] An encapsulation layer is located on the side of the cathode layer 50 facing away from the substrate.

[0105] A color filter layer, wherein the color filter layer is located on the side of the encapsulation layer opposite to the substrate.

[0106] For example, the white light emitting functional layer 40 is located between the anode pattern Ano and the cathode layer 50, emitting white light under the combined action of the anode pattern Ano and the cathode layer 50. The color filter layer includes color filter patterns of multiple colors, and the white light passing through the corresponding color filter pattern can be transformed into light of the corresponding color and emitted from the display panel. For example, the color filter layer includes red color filter patterns, green color filter patterns, and blue color filter patterns, but is not limited to these.

[0107] For example, the encapsulation layer includes at least one inorganic encapsulation layer, but is not limited thereto. For instance, the encapsulation layer includes a first inorganic encapsulation layer, an organic encapsulation layer, and a second inorganic encapsulation layer sequentially stacked along a direction away from the substrate.

[0108] This utility model embodiment also provides a display device, including the display panel provided in the above embodiment.

[0109] It should be noted that the display device can be any product or component with display function, such as a television, monitor, digital photo frame, mobile phone, or tablet computer. The display device also includes flexible circuit boards, printed circuit boards, and backplanes.

[0110] For example, the display panel includes a Micro OLED display panel, and the display device includes a Micro OLED display device, but is not limited thereto.

[0111] For example, Micro OLED display panels are used in AR / VR displays, but are not limited to this.

[0112] In the display panel provided in the above embodiment, a trench 101 is formed on the surface of the pixel defining layer PDL facing away from the substrate, and a partition structure 20 is provided in the trench 101, so that a cavity is formed between the first notch O1 on the side of the partition structure 20 and the trench wall of the trench 101. In this way, the portion of the light-emitting functional layer 40 that is located outside the pixel opening area K1 can be at least partially isolated at the cavity, thereby cutting off the path of horizontal (i.e., parallel to the substrate) transmission of electrical signals between adjacent pixel opening areas K1. Therefore, in the display panel provided by this utility model embodiment, while maintaining the light-emitting effect of independent sub-pixels, the partition effect is optimized, the problem of horizontal transmission of electrical signals emitted from the anode layer is solved, thereby solving the problem of image retention in the displayed image and effectively improving the display effect and reliability of the display product.

[0113] Therefore, the display device provided in this embodiment of the present invention, when including the above-mentioned display panel, can also solve the problem of image retention in the displayed image, and effectively improve the display effect and reliability of the display device.

[0114] This utility model embodiment also provides a method for manufacturing a display panel, used to manufacture the display panel provided in the above embodiment, the manufacturing method comprising:

[0115] Fabricate a pixel-defining material layer on a substrate;

[0116] The pixel defining material layer is patterned to form a pixel defining layer PDL. The pixel defining layer PDL defines a plurality of pixel opening regions K1. The pixel defining layer PDL includes a defining portion 10, which is located between adjacent pixel opening regions K1. The surface of the defining portion 10 facing away from the substrate has a trench 101. The inner side of the pixel defining layer facing the pixel opening region K1 has a second notch O2.

[0117] A partition structure 20 is formed in the trench 101. The partition structure 20 has a first notch O1 on its side. A cavity is formed between the first notch O1 and the trench wall of the trench 101. The distance between the second notch O2 and the top of the substrate is greater than the distance between the first notch O1 and the top of the substrate.

[0118] A light-emitting functional layer 40 is fabricated, the light-emitting functional layer 40 including a portion located inside the pixel opening area K1 and a portion located outside the pixel opening area K1. The portion located inside the pixel opening area K1 is at least partially isolated at the second notch O2, and the portion located outside the pixel opening area K1 is at least partially isolated at the cavity.

[0119] The manufacturing method specifically includes:

[0120] A pixelated anode pattern Ano is fabricated on a wafer. This anode pattern Ano has conductive properties, enabling electrical signals from the wafer to be transmitted to each sub-pixel.

[0121] On a wafer with an anode pattern Ano, a pixel defining layer PDL with an inner undercut structure is formed in the space region between the pixelated anode patterns Ano, and a trench 101 is formed on the surface of the defining portion 10 facing away from the substrate. For example, in the direction perpendicular to the extension direction of the partition structure 20, the cross-section of the trench wall of the trench 101 in the direction perpendicular to the substrate is an inverted trapezoid. More specifically, the pixel defining layer PDL can be formed in two ways, but is not limited to: Method 1: A pixel defining material layer is formed on the substrate, and a patterning process is performed on the pixel defining material layer to form a pixel defining layer PDL that defines multiple pixel opening regions K1 and has the trench 101; Method 2: A pixel defining material layer is formed on the substrate, and a first patterning process is performed on the pixel defining material layer to form a transition defining layer that defines multiple pixel opening regions K1, and a second patterning process is performed on the transition defining layer to form a pixel defining layer PDL with the trench 101. The above-mentioned patterning process can include conventional exposure, development, and etching processes, which will not be elaborated here.

[0122] An inorganic film layer is deposited and patterned. The partition structure 20 is formed within the trench 101. The partition structure 20 has an inverted trapezoidal cross-section perpendicular to the extension direction of the substrate. The side of the partition structure 20 has a first notch O1, forming a cavity between the first notch O1 and the trench wall of the trench 101. More specifically, the included angle α1 between the side of the partition structure 20 and the bottom surface of the trench 101 satisfies: α1 ≤ 70°. The slope angle α2 of the trench wall satisfies: 45° ≤ α2 ≤ 70°. The length L1 of the base of the inverted trapezoidal cross-section of the partition structure 20 and the length L2 of the top of the inverted trapezoidal cross-section of the partition structure 20 satisfy: L1 ≤ (4 / 5)L2. The partition structure 20 has a first thickness d1 in a direction perpendicular to the substrate, satisfying: d1≤(1 / 2)d2, where d2 is the depth of the trench 101.

[0123] A light-emitting functional layer 40 is fabricated, comprising a portion located within the pixel opening region K1 and a portion located outside the pixel opening region K1, wherein the portion located outside the pixel opening region K1 is at least partially blocked at the cavity. More specifically, the light-emitting functional layer 40 comprises an organic light-emitting material sub-film layer, which can be formed by vapor deposition, ensuring that each individual sub-pixel has the function of emitting white light.

[0124] The cathode layer 50, encapsulation layer, planarization layer, and color filter layer are fabricated sequentially until a complete Micro OLED display device structure is formed.

[0125] In the display panel manufactured using the method provided in this embodiment of the present invention, a trench 101 is formed on the surface of the pixel defining layer PDL facing away from the substrate, and a partition structure 20 is formed within the trench 101. A cavity is formed between the first notch O1 on the side of the partition structure 20 and the trench wall of the trench 101. This allows the portion of the subsequently formed light-emitting functional layer 40 located outside the pixel opening region K1 to be at least partially isolated at the cavity, thereby cutting off the horizontal (i.e., parallel to the substrate direction) transmission path of electrical signals between adjacent pixel opening regions K1. Simultaneously, the inner side of the pixel defining layer facing the pixel opening region is provided with a second notch, allowing the portion located within the pixel opening region to be at least partially isolated at the second notch, further cutting off the horizontal transmission path of electrical signals between adjacent pixel opening regions. Furthermore, by setting the distance between the top of the second notch away from the substrate and the substrate to be greater than the distance between the top of the first notch away from the substrate and the substrate, a step difference is formed between the tops of the second notch away from the substrate and the tops of the first notch away from the substrate. This better ensures that the light-emitting functional layer can be at least partially isolated at the inner edge and outer edge of the pixel opening area. Therefore, in the display panel manufactured using the method provided in this embodiment, while maintaining the light-emitting effect of independent sub-pixels, the isolation effect is optimized, the problem of horizontal transmission of electrical signals emitted from the anode layer is solved, thereby solving the problem of image retention in the displayed image and effectively improving the display effect and reliability of the display product.

[0126] It should be noted that the signal line extending in a certain direction means that the signal line includes a main part and a secondary part connected to the main part. The main part is a line, line segment, or strip-shaped body. The main part extends in a certain direction, and the length of the main part extending in a certain direction is greater than the length of the secondary part extending in other directions.

[0127] It should be noted that in the embodiments of this utility model, "same layer" can refer to film layers on the same structural layer. Alternatively, for example, film layers on the same layer can be layer structures formed by using the same film deposition process to form a specific pattern, and then patterning the film layer using the same photomask through a single patterning process. Depending on the specific pattern, the single patterning process may include multiple exposure, development, or etching processes, and the specific pattern in the formed layer structure can be continuous or discontinuous. These specific patterns may also be at different heights or have different thicknesses.

[0128] In the various method embodiments of this utility model, the sequence number of each step is not used to limit the order of each step. For those skilled in the art, changes in the order of each step are also within the protection scope of this utility model without creative effort.

[0129] It should be noted that the various embodiments in this specification are described in a progressive manner, and the same or similar parts between the various embodiments can be referred to mutually. Each embodiment focuses on describing the differences from other embodiments. In particular, the method embodiments are basically similar to the product embodiments, so the description is relatively simple, and the relevant parts can be referred to the description of the product embodiments.

[0130] Unless otherwise defined, the technical or scientific terms used in this disclosure shall have the ordinary meaning understood by one of ordinary skill in the art to which this utility model pertains. The terms “first,” “second,” and similar terms used in this disclosure do not indicate any order, quantity, or importance, but are merely used to distinguish different components. Terms such as “comprising” or “including” mean that the element or object preceding the word encompasses the elements or objects listed following the word and their equivalents, without excluding other elements or objects. Terms such as “connection,” “coupling,” or “linked” are not limited to physical or mechanical connections, but can include electrical connections, whether direct or indirect. Terms such as “upper,” “lower,” “left,” and “right” are used only to indicate relative positional relationships, which may change accordingly when the absolute position of the described object changes. It is understood that when an element such as a layer, film, region, or substrate is referred to as being “upper” or “lower” than another element, the element may be located “directly” above or below the other element, or there may be intermediate elements present. In the description of the above embodiments, specific features, structures, materials, or characteristics may be combined in any suitable manner in one or more embodiments or examples. The above description is merely a specific embodiment of this utility model, but the protection scope of this utility model is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the technical scope disclosed in this utility model should be included within the protection scope of this utility model. Therefore, the protection scope of this utility model should be determined by the scope of the claims.

Claims

1. A display panel, characterized in that, include: A substrate and a pixel defining layer disposed on the substrate, the pixel defining layer defining a plurality of pixel opening regions, the pixel defining layer including defining portions located between adjacent pixel opening regions, the defining portions having trenches on the surface of the defining portions facing away from the substrate. A partition structure is located within the trench. The partition structure has a first notch on its side, and a cavity is formed between the first notch and the trench wall. The inner side of the pixel defining layer facing the pixel opening area has a second notch, and the distance between the second notch and the top of the substrate is greater than the distance between the first notch and the top of the substrate. The light-emitting functional layer includes a portion located within the pixel opening area and a portion located outside the pixel opening area. The portion located within the pixel opening area is at least partially separated at the second notch, and the portion located outside the pixel opening area is at least partially separated at the cavity.

2. The display panel according to claim 1, characterized in that, The partition structure includes a first side and a second side, which are opposite each other along a direction intersecting the extension direction of the partition structure. A first cavity is formed between a first notch on the first side and its opposite groove wall, and a second cavity is formed between a first notch on the second side and its opposite groove wall.

3. The display panel according to claim 2, characterized in that, The first cavity extends along the extension direction of the boundary of its adjacent pixel opening region; and / or, the second cavity extends along the extension direction of the boundary of its adjacent pixel opening region.

4. The display panel according to claim 2, characterized in that, At least a portion of the pixel opening area is surrounded by the first notch.

5. The display panel according to any one of claims 1 to 4, characterized in that, In the direction perpendicular to the extension direction of the partition structure, the cross-section of the partition structure in the direction perpendicular to the substrate is an inverted trapezoid.

6. The display panel according to claim 5, characterized in that, In the direction perpendicular to the extension direction of the partition structure, the cross-section of the trench wall in the direction perpendicular to the substrate is an inverted trapezoid.

7. The display panel according to claim 6, characterized in that, The included angle a1 formed between the side surface of the partition structure and the bottom surface of the groove satisfies: a1≤70°.

8. The display panel according to claim 7, characterized in that, The slope angle a2 of the trough wall satisfies: 45°≤a2≤70°.

9. The display panel according to claim 5, characterized in that, The length of the bottom edge L1 and the length of the top edge L2 of the inverted trapezoidal section of the partition structure satisfy: L1≤(4 / 5)L2.

10. The display panel according to claim 9, characterized in that, L2-L1>L3, where L3 is the depth of the second notch.

11. The display panel according to claim 9, characterized in that, The orthographic projection of the defining portion on the substrate and the orthographic projection of the anode pattern in the display panel on the substrate have an overlapping area, the width of which is less than L1.

12. The display panel according to claim 5, characterized in that, The partition structure has a first thickness d1 in a direction perpendicular to the substrate, satisfying: d1≤(1 / 2)d2, where d2 is the depth of the trench.

13. The display panel according to claim 1, characterized in that, The distance between the orthographic projection of the partition structure on the substrate and the orthographic projection of the trench wall on the substrate is greater than or equal to 0.

14. The display panel according to claim 1, characterized in that, The light-emitting functional layer forms at least two stacked light-emitting units, and the light-emitting functional layer also includes a charge-generating sub-film layer located between adjacent light-emitting units. The charge-generating sub-film layer and all sub-film layers located between the charge-generating sub-film layer and the partition structure are separated at the cavity.

15. The display panel according to claim 1, characterized in that, The partition structure includes an inorganic partition structure.

16. The display panel according to claim 1, characterized in that, The display panel also includes: A driving circuit layer is located between the substrate and the pixel defining layer, and the driving circuit layer includes sub-pixel driving circuits distributed in an array. An anode layer comprising multiple anode patterns, each anode pattern being coupled to a corresponding sub-pixel driving circuit; the orthographic projection of the pixel opening region on the substrate lies within the orthographic projection of the corresponding anode pattern on the substrate. The light-emitting functional layer includes a white light-emitting functional layer, and the portion of the white light-emitting functional layer located within the pixel opening area is in contact with the corresponding anode pattern. A cathode layer, wherein the cathode layer is located on the side of the light-emitting functional layer opposite to the substrate; An encapsulation layer is located on the side of the cathode layer facing away from the substrate. A color filter layer, wherein the color filter layer is located on the side of the encapsulation layer opposite to the substrate.

17. A display device, characterized in that, Includes the display panel as described in any one of claims 1 to 16.

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