Display panel and display device

Abstract

The invention provides a display panel and a display device, and the display panel comprises a binding layer which is located between a light-emitting element and a driving circuit layer, the orthographic projection of the binding layer on a substrate covers the orthographic projection of the light-emitting element on the substrate, and the binding layer is connected with the light-emitting element and the driving circuit layer. The flow blocking column is located on the side, away from the substrate, of the driving circuit layer and is wrapped by the binding layer, and at least part of the flow blocking column surrounds the light-emitting element; the flow blocking columns comprise the first flow blocking columns located in the second area and the second flow blocking columns located in the first area. The height of the first flow blocking column is larger than that of the second flow blocking column. The flow blocking columns are arranged in the binding layer to block overflow and deformation of the binding layer, the reliability of the display panel is improved, the height of the first flow blocking columns in the binding layer in the second area is set to be larger than that of the second flow blocking columns in the binding layer in the first area, the brightness difference between the center and the edge of the binding area is reduced, and the brightness of the display panel is improved. The problem of vignetting at four corners of a display image is improved.

Description

Technical Field

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

[0002] The LED (Light Emitting Diode) conductive adhesive bonding technology is a technology that conducts the LED light-emitting element and the backplane through the hot pressing process of the ACF (Anisotropic Conductive Film) conductive adhesive. In order to reduce costs, the ACF conductive adhesive is divided into small pieces and then distributed according to the position of the pixel points. However, the patterned small piece design of the ACF conductive adhesive will exacerbate the overflow and deformation of the conductive adhesive during hot pressing, resulting in a smaller conduction area between the LED electrode and the backplane electrode, and poor reliability of the display panel.

[0003] Under the same process conditions, the deformation degree of the ACF conductive adhesive at the four corners of the bonding area is larger than that in the middle area, and the conduction area between the LED electrode and the backplane electrode in the four-corner area is smaller, resulting in a dark corner problem at the four corners of the displayed image in the bonding area. Summary of the Invention

[0004] The present invention provides a display panel and a display device. By providing flow-blocking posts in the bonding layer to block the overflow and deformation of the ACF bonding layer, the transfer yield of the light-emitting elements is ensured, the reliability of the display panel is improved, so as to ensure consistent display brightness, reduce the brightness difference between the center and the edge of the bonding area, and improve the problem of dark corners existing at the four corners of the displayed image.

[0005] In a first aspect, an embodiment of the present invention provides a display panel. In the first aspect, the present invention provides a display panel, including:

[0006] A substrate;

[0007] A driving circuit layer located on one side of the substrate;

[0008] A light-emitting element located on the side of the driving circuit layer away from the substrate;

[0009] A bonding layer located between the light-emitting element and the driving circuit layer, and the positive projection of the bonding layer on the substrate covers the positive projection of the light-emitting element on the substrate, and the bonding layer connects the light-emitting element and the driving circuit layer;

[0010] Flow-blocking posts located on the side of the driving circuit layer away from the substrate and covered by the bonding layer, and the flow-blocking posts are at least partially disposed around the light-emitting element;

[0011] The display panel includes a display area, the display area includes a first area and a second area, the second area at least partially surrounds the first area, and the blocking posts include a first blocking post located in the second area and a second blocking post located in the first area;

[0012] Wherein, the height of the first blocking post is greater than the height of the second blocking post.

[0013] In a second aspect, an embodiment of the present invention further provides a display device, including the display panel provided in the first aspect.

[0014] The display panel provided by the embodiment of the present invention sets blocking posts in the bonding layer to block the overflow and deformation of the bonding layer, ensure the alignment electrical connection between the light-emitting elements and the driving circuit layer, ensure signal transmission, improve the transfer yield, and improve the reliability of the display panel. At the same time, the height of the first blocking post in the bonding layer in the edge display area is set to be greater than the height of the second blocking post in the bonding layer in the central display area, and the first blocking post is used to strengthen the support for the bonding layer in the edge display area, further reducing the risk of overflow and deformation of the bonding layer in the edge display area. The difference in brightness between the center and the edge of the displayed image in the bonding area is reduced, and the problem of dark corners in the four corners of the displayed image is improved. At the same time, the alignment process margin between the light-emitting elements and the driving circuit layer can also be increased, reducing the manufacturing difficulty. Description of the Drawings

[0015] Figure 1 is a schematic diagram of a display panel provided by the prior art;

[0016] Figure 2 is Figure 1 a cross-sectional schematic diagram of a display panel along the AA' direction in;

[0017] Figure 3 is a structural schematic diagram of a display panel provided by an embodiment of the present invention;

[0018] Figure 4 is a structural schematic diagram of another display panel provided by an embodiment of the present invention;

[0019] Figure 5 is Figure 4 a cross-sectional schematic diagram of a display panel along the BB' direction in;

[0020] Figure 6 is Figure 4 a cross-sectional schematic diagram of a display panel along the BB' direction in;

[0021] Figure 7 is Figure 4 a cross-sectional schematic diagram of a display panel along the BB' direction in;

[0022] Figure 8It is a schematic structural diagram of another display panel provided by an embodiment of the present invention;

[0023] Figure 9 It is Figure 8 An enlarged schematic diagram of a display panel in the M area in

[0024] Figure 10 It is a schematic structural diagram of another display panel provided by an embodiment of the present invention;

[0025] Figure 11 It is Figure 10 An enlarged schematic diagram of a display panel in the N area in

[0026] Figure 12 It is Figure 10 An enlarged schematic diagram of another display panel in the N area in

[0027] Figure 13 It is Figure 10 An enlarged schematic diagram of another display panel in the N area in

[0028] Figure 14 It is Figure 4 An enlarged schematic diagram of a display panel in the Q area in

[0029] Figure 15 It is Figure 4 An enlarged schematic diagram of another display panel in the Q area in

[0030] Figure 16 It is a schematic structural diagram of two choke posts provided by an embodiment of the present invention;

[0031] Figure 17 It is Figure 4 An enlarged schematic diagram of a display panel provided in the Q area in

[0032] Figure 18 It is Figure 17 A cross-sectional schematic diagram of the display panel along the DD' direction in

[0033] Figure 19 It is Figure 4 An enlarged schematic diagram of another display panel provided in the Q area in

[0034] Figure 20 It is a schematic structural diagram of a display device provided by an embodiment of the present invention. Detailed implementation manners

[0035] The present invention will be further described in detail below with reference to the accompanying drawings and embodiments. It can be understood that the specific embodiments described herein are only used to explain the present invention, rather than limiting the present invention. Additionally, it should be noted that for ease of description, only the parts related to the present invention rather than all structures are shown in the accompanying drawings.

[0036] Figure 1 is a schematic diagram of a display panel provided by the prior art, Figure 2 is Figure 1 a cross-sectional schematic diagram of a display panel along the AA' direction in Figure 1 and Figure 2 , taking the LED (Light Emitting Diode) display panel 100 in the prior art as an example. During the transfer of the LED light-emitting device 10, the bonding process of the LED light-emitting device 10 usually adopts a hot pressing method to conduct the LED light-emitting device 10 and the driving backplane 12 through the anisotropic conductive film 11 (ACF). In the prior art, in order to reduce costs, the conductive adhesive 11 is usually divided into small pieces, and then the conductive adhesive 11 is patterned according to the position distribution of the LED light-emitting devices 10. However, the patterned small piece design of the conductive adhesive 11 will exacerbate the overflow and deformation of the conductive adhesive 11 during hot pressing, resulting in a smaller conduction area between the connection electrode terminal (Pad1) of the LED light-emitting device 10 and the electrode connection terminal (Pad2) on the driving backplane 12 ( Figure 2 as shown by the dotted circle in

[0037] ), which makes the reliability of the display panel 100 worse. Particularly prominent is that in the edge area of the display panel 100, the extrusion force on the conductive adhesive 11 in this area is reduced, resulting in more severe overflow and deformation, causing a difference in brightness between the center and the edge of the bonding area, and further resulting in a dark corner problem at the four corners of the image.

[0038] An embodiment of the present invention provides a display panel including a substrate, a driving circuit layer located on one side of the substrate, a light-emitting element located on the side of the driving circuit layer away from the substrate, a bonding layer located between the light-emitting element and the driving circuit layer, and the bonding layer covers the positive projection of the light-emitting element on the substrate in the positive projection of the substrate. The bonding layer connects the light-emitting element and the driving circuit layer. A flow-blocking column is located on the side of the driving circuit layer away from the substrate and is covered by the bonding layer. The flow-blocking column is at least partially disposed around the light-emitting element. The display panel includes a display area, and the display area includes a first area and a second area. The second area at least partially surrounds the first area. The flow-blocking column includes a first flow-blocking column located in the second area and a second flow-blocking column located in the first area. Among them, the height of the first flow-blocking column is greater than the height of the second flow-blocking column.

[0039] With the above technical solution, in the embodiment of the present invention, flow-blocking columns are arranged in the bonding layer to block the overflow and deformation of the bonding layer, ensure the alignment electrical connection between the light-emitting element and the driving circuit layer, ensure signal transmission, improve the transfer yield, and improve the reliability of the display panel. At the same time, the height of the first flow-blocking column in the bonding layer in the edge display area is greater than the height of the second flow-blocking column in the bonding layer in the central display area. The first flow-blocking column is used to strengthen the support for the bonding layer in the edge display area, further reduce the risk of overflow and deformation of the bonding layer in the edge display area, reduce the brightness difference between the center and the edge of the displayed image in the bonding area, and improve the problem of dark corners at the four corners of the displayed image. At the same time, the alignment process margin between the light-emitting element and the driving circuit layer can be increased, and the manufacturing difficulty can be reduced.

[0040] The above is the core idea of the present invention. Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without making creative efforts belong to the scope of protection of the present invention.

[0041] Figure 3 is a schematic structural diagram of a display panel provided by an embodiment of the present invention, Figure 3 is a schematic structural diagram of a display panel provided by an embodiment of the present invention, Figure 4 is a schematic structural diagram of another display panel provided by an embodiment of the present invention, Figure 5 is Figure 3 a schematic cross-sectional view of a display panel along the BB' direction in. Refer to Figures 3 - 5 , the display panel 200 provided by the embodiment of the present invention includes a substrate 20, a driving circuit layer 30 is located on one side of the substrate 20, and a light-emitting element 40 is located on the side of the driving circuit layer 30 away from the substrate 20. A bonding layer 50 is located between the light-emitting element 40 and the driving circuit layer 30, and the orthographic projection of the bonding layer 50 on the substrate 20 covers the orthographic projection of the light-emitting element 40 on the substrate 20. The bonding layer 50 connects the light-emitting element 40 and the driving circuit layer 30. Flow-blocking columns 60 are located on the side of the driving circuit layer 30 away from the substrate 20 and are covered by the bonding layer 50. The flow-blocking columns 60 are at least partially arranged around the light-emitting element 40. The display panel 200 includes a display area AA, and the display area AA includes a first area A1 and a second area A2. The second area A2 at least partially surrounds the first area A1. The flow-blocking columns 60 include a first flow-blocking column 61 located in the second area A2 and a second flow-blocking column 62 located in the first area A1. Among them, the height of the first flow-blocking column 61 is greater than the height of the second flow-blocking column 62.

[0042] Among them, the display panel 200 can be an LED (Light Emitting Diode) display panel, a Micro-LED (Micro Light Emitting Diode Display) display panel, a Mini-LED (Mini Light Emitting Diode) display panel, etc. The embodiments of the present invention do not limit the specific light-emitting type of the display panel. The display area AA can display images normally, and the non-display area NA at least partially surrounds the display area AA and is used to set signal traces and protect the display area, etc. The display area AA is divided into a first area A1 and a second area A2 according to the center and the edge. The first area A1 can be the central display area, and the second area A2 is the edge display area. The second area A2 at least partially surrounds the first area A1. In some embodiments, when the surface shape of the display panel 200 is rectangular, a vignetting problem is likely to occur at the four corners of the display area AA. In some embodiments, when the surface shape of the display panel 200 is circular, a problem of decreasing brightness is likely to occur at the edge of the display area AA. The second area A2 proposed in the embodiments of the present invention can refer to the four-corner area of the display area AA or the edge area of the entire display area AA. At the same time, according to the display effect at the edge of the display area AA, the width range of the second area A2 can be reasonably adjusted, and the embodiments of the present invention do not make restrictions.

[0043] It should be noted that Figure 3 and Figure 4 in the following drawings of the present invention, only some of the light-emitting elements 40 within the ranges of the first area A1 and the second area A2 are used for exemplary illustration, and more light-emitting elements 40 are not shown one by one. In view of the problem of uneven brightness in the central and edge regions of the display area AA, the present invention optimizes the structural design of the display panel. Specifically:

[0044] Referring to Figure 5 , the material of the substrate 20 includes but is not limited to rigid materials such as glass or silicon wafers, and can also be flexible materials such as ultra-thin glass, metal foils or polymer plastic materials. The flexible or rigid substrate 20 can block oxygen and moisture and prevent moisture or impurities from diffusing into the display panel 200 through the substrate 20.

[0045] The driving circuit layer 30 includes pixel circuits. The pixel circuits can be circuit structures such as 2T1C, 4T1C, 7T1C, 7T2C, 8T1C, 8T2C, etc. The pixel circuits include multiple thin film transistors (TFTs), storage capacitors and metal traces and other film layer structures (not shown in the drawings of the embodiments of the present invention). Those skilled in the art should understand clearly and will not be elaborated here.

[0046] The light-emitting unit element 40 can be an LED, a Micro-LED, a Mini-LED, etc., and the embodiments of the present invention are not limited thereto.

[0047] The bonding layer 50 is disposed on the side of the driving circuit layer 30 away from the substrate 20, and is at least disposed in the area of the light-emitting element 40. The pixel circuit of the driving circuit layer 30 is electrically connected to the light-emitting unit element 40 through the bonding layer 50, and the pixel circuit provides a driving voltage to the light-emitting unit element 40 to drive the light-emitting unit element 40 to emit light. Wherein, the bonding layer 50 can be connected to the light-emitting unit element 40 by a thermocompression bonding process. Optionally, the bonding layer 50 includes an anisotropic conductive film (ACF). The anisotropic conductive film contains conductive balls and has a conductive function ( Figure 5 not shown in the figure).

[0048] Reference Figures 3 - 5 , in the embodiment of the present invention, a choke column 60 is disposed in the bonding layer 50 on the side of the driving circuit layer 30 away from the substrate 20. The choke column 60 at least partially surrounds the light-emitting element 40, which can support the bonding layer 50, block the overflow and deformation of the bonding layer 50 before and during the thermocompression bonding, ensure the alignment electrical connection between the light-emitting element 40 and the driving circuit layer 30, ensure the voltage signal transmission, thereby improving the transfer yield of the light-emitting element 40 and the reliability of the display panel.

[0049] It should be noted that the bonding layer 50 has a small deformation during the thermocompression bonding process, which is beneficial to increasing the alignment process margin between the light-emitting element 40 and the driving circuit layer 30 and reducing the manufacturing difficulty.

[0050] Among them, the increase in the alignment process margin usually means that in the manufacturing process, the allowable alignment deviation range is expanded. In this way, both the product yield can be improved, and at the same time, high-precision equipment is not required, reducing the manufacturing cost.

[0051] Further, referring to Figure 5 , in view of the problem of reduced brightness at the edges and four corners of the display area AA, the embodiment of the present invention differentiates the choke columns 60 in the edge area and the central area of the display area AA. Specifically, the present invention strengthens the blocking of the overflow and deformation of the bonding layer 50 in the second area A2 by increasing the height of the first choke column 61 in the second area A2. Exemplarily, the height h1 of the first choke column 61 in the bonding layer 50 in the second area A2 is set to be greater than the height h2 of the second choke column 62 in the bonding layer 50 in the first area A2, that is, h1>h2. The first choke column 61 is used to strengthen the support of the bonding layer 50 in the edge display area, further reducing the risk of overflow and deformation of the bonding layer 50 in the edge display area, further improving the reliability of the display area, and further reducing the brightness difference between the center and the edge of the display image in the bonding area, and improving the problem of dark corners in the four corners of the display image.

[0052] Among them, the bonding region refers to the region where the bonding layer 50 is electrically connected to the light-emitting unit element 40.

[0053] It should be noted that referring to Figure 3 , the display panel 200 also includes other functional film layers, such as a packaging layer, etc. Multiple film layers work together to achieve the normal display of the display panel, which will not be elaborated here.

[0054] In summary, the display panel provided by the embodiment of the present invention sets flow-blocking columns in the bonding layer to block the overflow and deformation of the bonding layer, ensure the electrical connection of the light-emitting element and the driving circuit layer in alignment, ensure signal transmission, improve the transfer yield, and improve the reliability of the display panel. At the same time, the height of the first flow-blocking column in the bonding layer in the edge display area is set to be greater than the height of the second flow-blocking column in the bonding layer in the central display area, and the first flow-blocking column is used to strengthen the support for the bonding layer in the edge display area, further reducing the risk of overflow and deformation of the bonding layer in the edge display area, reducing the brightness difference between the center and the edge of the displayed image in the bonding area, and improving the problem of dark corners at the four corners of the displayed image. At the same time, the alignment process margin between the light-emitting element and the driving circuit layer can also be increased, reducing the manufacturing difficulty.

[0055] In some embodiments, continuing to refer to Figure 3 , the orthographic projection of the bonding layer 50 on the substrate 20 is a continuous projection. Exemplarily, the bonding layer 50 can be a whole film layer, that is, the whole bonding layer 50 material is formed by directly adopting processes such as deposition or coating on the side of the driving circuit layer 30 away from the substrate 20 during the manufacturing process.

[0056] In some embodiments, continuing to refer to Figure 4 , the bonding layer 50 includes a plurality of independent bonding structures 51, and the bonding structures 51 are located between the light-emitting elements 40 and the driving circuit layer 30. Exemplarily, small pieces of bonding layer material 50 are placed on the surface of the electrode connection end (Pad2) of the driving backplane 12 through a transfer process. Compared with the whole-surface attachment technology of the bonding layer material, it is beneficial to reduce costs.

[0057] On the basis of the above embodiments, referring to Figure 5 , along the thickness direction (Z direction in the figure) of the display panel 200, it is necessary to limit the height H1 of the flow-blocking column 60 to be less than the thickness H2 of the bonding layer 50 to avoid affecting the positioning and transfer of the light-emitting element 40 due to the protrusion of the flow-blocking column 60 and ensure the transfer yield of the light-emitting element 40.

[0058] On the basis of the above embodiments, continuing to refer to Figure 3 and Figure 4, the heights of the internal resistance flow columns 60 in the first area A1 are the same. Such a design is beneficial to reducing the manufacturing process difficulty of the internal resistance flow columns 60 in the first area A1, promoting the consistent overflow and deformation of the bonding layer 50 in this area, and ensuring the electrical connection between the light-emitting elements 40 and the drive circuit layer 30 in this area.

[0059] Based on the above embodiments, the distance between the first flow-blocking column 61 in the bonding layer 50 in the second area A2 and the first area A1 can also be made different to further reduce the risk of overflow and deformation of the peripheral bonding layer 50. Figure 6 is Figure 4 a schematic cross-sectional view of a display panel along the BB' direction in Figure 6 , the second area A2 includes a plurality of first light-emitting elements 41. The first flow-blocking column 61 includes a first sub-flow-blocking column 61a and a second sub-flow-blocking column 61b. The second sub-flow-blocking column 61b is located on the side of the first sub-flow-blocking column 61a away from the first light-emitting element 41 and on the side of the first light-emitting element 41 away from the first area A1. The height h1b of the second sub-flow-blocking column 61b is greater than the height h1a of the first sub-flow-blocking column 61a.

[0060] Specifically, referring to Figure 4 and Figure 6 , the second area A2 is located at the edge of the display area AA. When hot-press bonding, the bonding layer 50 in this area overflows more severely towards the edge of the display area AA. In the embodiments of the present invention, the heights of the first flow-blocking columns 61 corresponding to the periphery of the first light-emitting elements 41 in the second area A2 are designed differently, that is, the first flow-blocking columns 61 in the m area extending horizontally and the n area extending vertically in Figure 4 . Referring to Figure 6 , the height h1b of the second sub-flow-blocking column 61b, which is far from the first area A1 and the first light-emitting element 41, is set to be greater than the height h1a of the first sub-flow-blocking column 61a, which is far from the first area A1 but close to the first light-emitting element 41. The higher second sub-flow-blocking column 61b is used to further inhibit the overflow of the bonding layer 50 in this area towards the edge of the display area AA.

[0061] Based on the above embodiments, continuing to refer to Figure 6 , the first flow-blocking column 61 further includes a third sub-flow-blocking column 61c. The third sub-flow-blocking column 61c is located on the side of the second sub-flow-blocking column 61b away from the first light-emitting element 41. The height h1c of the third sub-flow-blocking column 60 is greater than the height h1b of the second sub-flow-blocking column 61b. In the embodiments of the present invention, the height of the first flow-blocking column 61 surrounding the first light-emitting element 41 can also be set to gradually increase along the direction away from the first area A1. Specifically, continuing to refer to Figure 4 , for Figure 4The first flow-blocking posts 61 in the m region extending horizontally and the n region extending vertically are arranged such that h1c > h1b > h1a in the direction away from the first region A1. By gradually increasing the height of the first flow-blocking posts 61, the overflow of the bonding layer 50 is gradually blocked, improving the problem of more serious overflow of the bonding layer 50 at the edge and four corners of the display region AA.

[0062] It should be noted that, with reference to Figure 6 , the second region A2 also includes some first flow-blocking posts 61 (as shown by the circular dotted line in Figure 6 ). This part of the first flow-blocking posts 61 is arranged opposite to the first sub-flow-blocking posts 61a and the second sub-flow-blocking posts 61b with respect to the first light-emitting element 40, and is close to the first region A1. In the embodiment of the present invention, the height of this part of the first flow-blocking posts 61 can be set to be the same or different according to the severity of the overflow of the bonding layer 50 corresponding to this region, so as to minimize the deformation of the bonding layer 50.

[0063] Specifically, Figure 7 is Figure 4 a schematic cross-sectional view of a display panel along the BB' direction in Figure 7 . As shown in the reference

[0064] Figure 8 In the embodiment of the present invention, for all the first flow-blocking posts 61 surrounding the first light-emitting element 41 in the second region A2, the second sub-flow-blocking posts 61b are arranged on the side away from the first light-emitting element 41 of the first sub-flow-blocking posts 61a, and the third sub-flow-blocking posts 61c are arranged on the side away from the first light-emitting element 41 of the second sub-flow-blocking posts 61b. The height h1b of the second sub-flow-blocking posts 61b is greater than the height h1a of the first sub-flow-blocking posts 61a, and the height h1c of the third sub-flow-blocking posts 60 is greater than the height h1b of the second sub-flow-blocking posts 61b. That is to say, the height of the first sub-flow-blocking posts 61a surrounding the first light-emitting element 41 can be set to gradually increase in the direction away from the first light-emitting element 41, thereby reducing the risk of overflow and deformation of the bonding layer 50 in the second region A2, ensuring the electrical connection between the first light-emitting element 41 and the driving circuit layer 30, and improving the reliability of the display panel. Figure 9 is Figure 8 a schematic structural view of another display panel provided by the embodiment of the present invention, Figure 10 is Figure 11 is Figure 10 a magnified schematic view of a display panel in the N region in Figures 8 - 11, the flow-blocking posts 60 include a first row of flow-blocking posts 63 and a second row of flow-blocking posts 64. Both the first row of flow-blocking posts 63 and the second row of flow-blocking posts 64 are arranged around the light-emitting element 40, and the second row of flow-blocking posts 64 is located on the side of the first row of flow-blocking posts 63 away from the light-emitting element 40.

[0065] In the embodiment of the present invention, taking the flow-blocking posts 60 in the second region A2 as an example, at least two rows of flow-blocking posts 60 can be arranged around the light-emitting element 40 to support the bonding layer 50 and block the overflow and prevent its deformation. Specifically:

[0066] In some embodiments, referring to Figure 9 , both the first row of flow-blocking posts 63 and the second row of flow-blocking posts 64 are arranged around the light-emitting element 40, and the orthographic projections of the first row of flow-blocking posts 63 and the second row of flow-blocking posts 64 on the substrate 20 are discontinuous projections. In the embodiment of the present invention, a third row of flow-blocking posts ( Figure 9 not shown in

[0067] In some embodiments, referring to Figure 11 , both the first row of flow-blocking posts 63 and the second row of flow-blocking posts 64 are arranged around the light-emitting element 40, and the orthographic projections of the first row of flow-blocking posts 63 and the second row of flow-blocking posts 64 on the substrate 20 are continuous projections, forming a continuous retaining wall to block the overflow of the bonding layer 50.

[0068] Figure 12 is Figure 10 an enlarged schematic diagram of another display panel in the N region in Figure 12 , both the first row of flow-blocking posts 63 and the second row of flow-blocking posts 64 are arranged around the light-emitting element 40. The orthographic projection of the first row of flow-blocking posts 63 on the substrate 20 is a continuous projection, and the orthographic projection of the second row of flow-blocking posts 64 on the substrate 20 is a discontinuous projection. A continuous retaining wall can be formed by the first row of flow-blocking posts 63 to block the overflow of the bonding layer 50 in all directions. When the overflow of the bonding layer 50 weakens, the second row of flow-blocking posts 64 is further used to block the overflow of the bonding layer 50.

[0069] Figure 13 is Figure 10 an enlarged schematic diagram of another display panel in the N region in Figure 13 As shown, both the first row of flow-blocking posts 63 and the second row of flow-blocking posts 64 are arranged around the light-emitting element 40. The orthographic projection of the first row of flow-blocking posts 63 on the substrate 20 is a discontinuous projection, and the orthographic projection of the second row of flow-blocking posts 64 on the substrate 20 is a continuous projection. The combination of the first row of flow-blocking posts 63 and the second row of flow-blocking posts 64 is used to block the overflow of the bonding layer 50 in all directions.

[0070] Based on the above embodiments, continue to refer to Figure 9, the first row of flow-blocking columns 63 includes a plurality of first sub-flow-blocking columns 63a, the second row of flow-blocking columns 64 includes a plurality of second sub-flow-blocking columns 64a, the plurality of first sub-flow-blocking columns 63a are arranged at equal intervals, and / or; the plurality of second sub-flow-blocking columns 64a are arranged at equal intervals. In the embodiments of the invention, at least two rows of flow-blocking columns 60 corresponding to the periphery of the light-emitting element 40 can be patterned, and each row of flow-blocking columns 60 is composed of a plurality of sub-flow-blocking columns. Exemplarily, the first row of flow-blocking columns 63 is composed of a plurality of first sub-flow-blocking columns 63a, and the plurality of first sub-flow-blocking columns 63a are arranged around the light-emitting element 40 at equal intervals. The second row of flow-blocking columns 64 is composed of a plurality of second sub-flow-blocking columns 64a, and the plurality of second sub-flow-blocking columns 64a are arranged around the light-emitting element 40 at equal intervals. By arranging at equal intervals, the bonding layer 50 around the light-emitting element 40 can be blocked from overflowing in all directions at equal intervals, reducing the deformation of the bonding layer 50. With the above structural design, even if deformation occurs, it is beneficial to keep the deformation of the periphery of the bonding layer 50 consistent, ensuring the electrical connection between the light-emitting element 40 and the driving circuit layer 30.

[0071] Optionally, the cross-sectional shape of the flow-blocking column 60 provided in the above embodiment includes a triangle, a rhombus, a square, a circle, and an irregular shape. It should be noted that the cross-sectional shape of the flow-blocking column 60 is not limited in the embodiments of the present invention, and the cross-sectional shape and size of the flow-blocking column 60 can be reasonably set according to the area, position, and overflow situation of the bonding layer 50. Exemplarily, referring to Figure 9 , the cross-sections of the first sub-flow-blocking columns 63a and the second sub-flow-blocking columns 64a are circular.

[0072] In other embodiments, only the plurality of first sub-flow-blocking columns 63a in the first row of flow-blocking columns 63 can be arranged at equal intervals, or the plurality of second sub-flow-blocking columns 64a in the second row of flow-blocking columns 64 can be arranged at equal intervals. The embodiments of the present invention will not be shown one by one.

[0073] Based on the above embodiment, continue to refer to Figure 9 , the first row of flow-blocking columns 63 includes a plurality of first sub-flow-blocking columns 63a, the second row of flow-blocking columns 64 includes a plurality of second sub-flow-blocking columns 64a, the first row of flow-blocking columns 63 and the second row of flow-blocking columns 64 are adjacent, and the first sub-flow-blocking columns 63a and the second sub-flow-blocking columns 64a are arranged in parallel or staggered. In the embodiments of the invention, the plurality of first sub-flow-blocking columns 63a and the plurality of second sub-flow-blocking columns 64a are patterned, and by arranging them in parallel or staggered, the overflow resistance of the bonding layer 50 can be increased, and the deformation of the bonding layer 50 can be slowed down.

[0074] Based on the above embodiment, the flow-blocking column 60 can also be set at the position where the overflow of the bonding layer 50 is serious at the top corner according to the shape of the positive projection of the bonding layer 50 on the driving circuit layer 20. Figure 14 is Figure 4An enlarged schematic diagram of a display panel in the middle Q region Figure 15 is Figure 4 Another enlarged schematic diagram of a display panel in the middle Q region, refer to Figure 14 and Figure 15 , the flow blocking posts 60 include a first group of flow blocking posts 65, a second group of flow blocking posts 66, a third group of flow blocking posts 67 and a fourth group of flow blocking posts 68; the first group of flow blocking posts 65 and the third group of flow blocking posts 67 are arranged opposite to the light emitting elements 40, and the second group of flow blocking posts 66 and the fourth group of flow blocking posts 68 are arranged opposite to the light emitting elements 40. In the embodiments of the present invention, the bonding layer 50 adopts a patterned design, and each light emitting element 40 corresponds to a bonding structure 51. The shape of the orthographic projection of the bonding structure 51 on the driving circuit layer 30 includes but is not limited to a rectangle, a circle, etc. As an example, refer to Figure 14 , set the orthographic projection of the bonding structure 51 on the substrate 20 to be a rectangle. In the embodiments of the present invention, the first group of flow blocking posts 65, the second group of flow blocking posts 66, the third group of flow blocking posts 67 and the fourth group of flow blocking posts 68 can be respectively arranged at the four corners of the bonding structure 51 to strengthen the blocking of the overflow at the four corners of the bonding structure 51, prevent the deformation of its four corners, and ensure the reliability of the display panel.

[0075] Furthermore, the number and arrangement of the sub-flow blocking posts in each group of flow blocking posts 60 can also be designed. In some embodiments, refer to Figure 14 , at least one of the first group of flow blocking posts 65, the second group of flow blocking posts 66, the third group of flow blocking posts 67, and the fourth group of flow blocking posts 68 includes a plurality of sub-flow blocking posts 60a. The plurality of sub-flow blocking posts 60a are arranged in an array. Exemplarily, a plurality of sub-flow blocking posts 60a arranged in an array are provided in each of the first group of flow blocking posts 65, the second group of flow blocking posts 66, the third group of flow blocking posts 67, and the fourth group of flow blocking posts 68. Refer to Figure 15 , in each group of flow blocking posts, multiple rows of sub-flow blocking posts 60b can also be used, and the multiple rows of sub-flow blocking posts 60b are bent towards the light emitting elements 40. By setting like this, the same overflow resistance can be provided to the four corners of the bonding structure 51, which is beneficial to maintaining the stable morphology of the four corners of the bonding structure 51. Among them, the cross-sectional shapes of the sub-flow blocking posts 60a and the multiple rows of sub-flow blocking posts 60b include but are not limited to triangle, rhombus, square, circle, irregular shape, etc.

[0076] On the basis of the above embodiments, refer to Figures 3 - 15 shown, aiming at the problems of darker spots at the edges and four corners of the display area and more serious overflow of the bonding layer 50 at the edges and four corners of the display area, the material of the flow blocking posts 60 provided by the embodiments of the present invention can be a reflective material. Among them, the material of the flow blocking posts 60 includes but is not limited to metal, organic material (epoxy resin), inorganic material (SiO2 / SiNx), metal oxide (Al2O3), etc.

[0077] By setting the height, position, arrangement, etc. of the flow blocking posts 60, the present invention can reflect the light emitted by the light emitting element 40 towards the front view angle, thereby improving the display brightness of the light emitting element 40. Exemplarily, continuing to refer to Figure 6 and Figure 7 , along the direction away from the light emitting element 40, the height of the flow blocking posts 60 is gradually increased, and the light in the multi-angle range emitted by the light emitting element 40 is emitted towards the front view angle through the successively increasing flow blocking posts 60. Referring to Figures 8 - 13 , the flow blocking posts 60 are arranged around the light emitting element 40 to surround and reflect the light emitted by the light emitting element 40 to the front view angle, improving the overall brightness of the light emitting element 40. Continuing to refer to Figure 14 and Figure 15 , the flow blocking posts 60 are arranged at the four corner positions of the light emitting element 40, and the light at the four corner positions can be reflected to the front view angle for emission, so as to improve the brightness at the four corner positions of the light emitting element 40.

[0078] Among them, the front view angle refers to the light emitting direction of the light emitting element 40 along the display panel 200, and can also be understood as the Z direction as shown in Figures 5 - 6 .

[0079] In the embodiments of the present invention, the light emitting element 40 generally includes a red light emitting element R, a green light emitting element G, and a blue light emitting element B, and an image is displayed by mixing the light emitted by the three light emitting elements. However, the test results show that among the RGB three colors, the red light emitting element R has a low luminous efficiency due to material characteristics and is difficult to meet the requirements of existing displays. Based on this, the embodiments of the present invention can also improve the luminous efficiency of the red light emitting element R by adjusting the reflectivity, arrangement density, height, etc. of the flow blocking posts 60 corresponding to the red light emitting element R, the green light emitting element G, and the blue light emitting element B.

[0080] In some embodiments, continuing to refer to Figure 3 , Figure 4 , Figures 8 - 15 , the reflectivity of the flow blocking posts 60 corresponding to the red light emitting element R is set to be greater than the reflectivity of the flow blocking posts 60 corresponding to the green light emitting element G, and greater than the reflectivity of the flow blocking posts 60 corresponding to the blue light emitting element B, so as to improve the luminous efficiency of the red light emitting element R. Specifically, in the embodiments of the present invention, flow blocking posts 60 made of high refractive index materials are arranged around the red light emitting element R, such as metals, metal oxides (Al2O3), etc. Flow blocking posts 60 made of low refractive index materials are arranged around the green light emitting element G and the blue light emitting element B, such as low refractive index organic materials (epoxy resins), inorganic materials (SiO2 / SiNx), etc. It should be noted that the magnitude relationship between the reflectivity of the flow blocking posts 60 corresponding to the green light emitting element G and the reflectivity of the flow blocking posts 60 corresponding to the blue light emitting element B in the present invention is not limited.

[0081] In some embodiments, continuing to refer to Figure 3, Figure 4 , Figures 8 - 15 , the arrangement density of the current blocking posts 60 corresponding to the red light-emitting elements R is set to be greater than that of the current blocking posts 60 corresponding to the green light-emitting elements G, and greater than that of the current blocking posts 60 corresponding to the blue light-emitting elements B. In this way, the luminous efficiency of the red light-emitting elements R can be improved. It should be noted that the size relationship between the arrangement density of the current blocking posts 60 corresponding to the green light-emitting elements G and that of the current blocking posts 60 corresponding to the blue light-emitting elements B is not limited.

[0082] In some embodiments, with continued reference to Figure 3 , Figure 4 , Figures 8 - 15 , the height of the current blocking posts 60 corresponding to the red light-emitting elements R is set to be greater than that of the current blocking posts 60 corresponding to the green light-emitting elements G, and greater than that of the current blocking posts 60 corresponding to the blue light-emitting elements B. In this way, the luminous efficiency of the red light-emitting elements R can be improved. It should be noted that the size relationship between the height of the current blocking posts 60 corresponding to the green light-emitting elements G and that of the current blocking posts 60 corresponding to the blue light-emitting elements B is not limited.

[0083] In summary, in the embodiments of the present invention, by reasonably selecting the material, arrangement density, and height of the current blocking posts 60, a differential design is carried out on the current blocking posts 60 corresponding to the three RGB colors. On the one hand, the current blocking posts 60 block the overflow of the bonding layer 50. On the other hand, the current blocking posts 60 can reflect light to the front view angle, improving the overall luminous brightness of the three RGB colors. On the other hand, through the differential design of the current blocking posts 60, it is beneficial to improve the luminous efficiency of the red light-emitting elements R, making the luminous efficiencies of the three RGB colors consistent and improving the overall display effect. Particularly prominent is that it also helps to reduce the driving current of the red light-emitting elements R and extend the service life of the red light-emitting elements R.

[0084] Figure 16 are schematic structural diagrams of two current blocking posts provided by the embodiments of the present invention. On the basis of the above embodiments, in combination with Figure 5 and Figure 16 , the orthographic projection of the side of the current blocking post 60 away from the substrate 20 on the substrate 20 is smaller than the orthographic projection of the side of the current blocking post 60 close to the substrate 20 on the substrate 20, and the bottom angle α of the current blocking post 60 facing the light-emitting element 40 is an acute angle, where the value range of α is 30° to 60°.

[0085] Specifically, in the embodiments of the present invention, the current blocking post 60 can also adopt a frustum shape, and its reflection surface M1 facing the light-emitting element 40 is inclined, reflecting the light S emitted by the light-emitting element 40 to be emitted to the front view angle. In this way, the light extraction efficiency of the light-emitting element 40 can be improved.

[0086] It should be noted that the range of the inclination angle α of the reflection surface M1 of the flow blocking column 60 is not limited to 30° to 60°, and can be reasonably adjusted according to the light reflection efficiency.

[0087] Optionally, the cross-section of the flow blocking column 60 can be triangular, rhombic, square, circular, irregular, etc.

[0088] Optionally, referring to Figure 16 , the surface of the flow blocking column 60 facing the light-emitting element 40 is a flat surface or a concave surface. In the embodiments of the present invention, the efficiency of the reflected light S can be improved by adjusting the surface shape of the reflection surface M1 of the flow blocking column 60, and the light-emitting brightness of the light-emitting element 40 can be increased.

[0089] Optionally, referring to Figure 16 , in the embodiments of the present invention, considering the process limitations, the minimum width W1 of the cross-section of the flow blocking column 60 is set to be ≥ 0.5 μm. With the above parameters, the flow blocking column 60 has a certain blocking area and can play a role in blocking the overflow of the bonding layer 50.

[0090] Figure 17 is Figure 4 an enlarged schematic diagram of a display panel provided in the Q region in Figure 18 is Figure 17 a cross-sectional view of the display panel along the DD' direction in Figure 19 is Figure 4 another enlarged schematic diagram of a display panel provided in the Q region in Figure 4 , Figures 17 - 19 , the driving circuit layer 30 includes a plurality of backplane electrode groups 31, and the backplane electrode group 31 includes two backplane electrodes 31a arranged at intervals; the bonding layer 50 includes a groove region 52, the groove region 52 is located between the two backplane electrodes 31a, the groove region 52 includes one groove 52a or a plurality of grooves 52a, and when a plurality of grooves 52a are provided, the plurality of grooves 52a are arranged in an array.

[0091] Specifically, referring to Figure 18, the light-emitting element 40 further includes a first electrode 40a and a second electrode 40b. The first electrode 40a can be an anode, and the second electrode 40b is a cathode; alternatively, the first electrode 40a can be a cathode, and the second electrode 40b is an anode. The bonding layer 50 uses an anisotropic conductive film (ACF), which contains conductive particles. The first electrode 40a is connected to a backplane electrode 31a in the backplane electrode group 31 through the conductive particles in the bonding layer 50, and the second electrode 40b is connected to another backplane electrode 31a in the backplane electrode group 31 through the conductive particles in the bonding layer 50. The pixel circuit provides a driving voltage to the light-emitting element 40 through the backplane electrode 31a. Compared with the laser welding process, the embodiment of the present invention uses an anisotropic conductive film (ACF) to bond the light-emitting element 40 to the driving circuit layer 30, which can reduce the production of the eutectic metal layer, simplify the process flow, and improve production efficiency.

[0092] In the embodiment of the present invention, in order to avoid the problem that the bonding layer 50 between the cathode and anode of the light-emitting element 40 is squeezed, resulting in uneven or offset bonding positions, a groove area 52 is provided in the bonding layer 50 between the anode and cathode of the light-emitting element 40 in the embodiment of the present invention, which can release the extrusion stress of the bonding layer 50 in this area and reduce the deformation of the bonding layer 50. Among them, the number of grooves 52a in the groove area 52 can be one or more. Refer to Figure 19 , when multiple grooves 52a are used, the grooves 52a can be small grooves distributed in an array, which can evenly release the extrusion stress in this area. It should be noted that the cross-sectional shape of the groove 52a is not limited. Exemplarily, it can also be circular, square, rectangular, and irregular shapes, etc.

[0093] Based on the above embodiments, continue to refer to Figure 17 and Figure 19 , along Figure 17 the first direction X in Figure 17 , the length L1 of the groove area 52 is less than the length L2 of the backplane electrode 31a; along Figure 17 the second direction Y in Figure 17In the Y direction, it is defined that the width W2 of the groove 52a does not exceed the distance W3 between two backplane electrodes 31a, i.e., W2 < W3. Such a setting can ensure that the light-emitting element 40 is positioned and electrically connected to the backplane electrode 31a on the backplane electrode group 31, improving the reliability of the display panel.

[0094] Based on the same inventive concept, an embodiment of the present invention further provides a display device. Figure 20 It is a schematic structural diagram of a display device provided by an embodiment of the present invention. Combining Figure 20 As shown, the display device 300 includes any one of the display panels 200 provided in the above embodiments. Therefore, the display device 300 also has the beneficial effects of the display panel 200 in the above embodiments. The same parts can be understood by referring to the explanation of the display panel 200 above, and will not be elaborated below.

[0095] The display device 300 provided by an embodiment of the present invention can be Figure 20 the mobile phone shown in the figure, or any electronic product with a display function, including but not limited to the following categories: televisions, laptop computers, desktop monitors, tablet computers, digital cameras, smart bracelets, smart glasses, in-vehicle displays, industrial control devices, medical display screens, touch interaction terminals, etc. The embodiments of the present invention do not make special limitations on this.

[0096] Note that the above is only a preferred embodiment of the present invention and the applied technical principles. Those skilled in the art will understand that the present invention is not limited to the specific embodiments described here. Various obvious changes, re-adjustments and substitutions can be made by those skilled in the art without departing from the protection scope of the present invention. Therefore, although the present invention has been described in more detail through the above embodiments, the present invention is not limited to the above embodiments. Without departing from the inventive concept of the present invention, more other equivalent embodiments can be included, and the scope of the present invention is determined by the scope of the appended claims.

Claims

1. A display panel, characterized in that, Comprising; Substrate; Drive circuit layer, located on one side of the substrate; Light-emitting element, located on the side of the drive circuit layer away from the substrate; Bonding layer, located between the light-emitting element and the drive circuit layer, and the orthographic projection of the bonding layer on the substrate covers the orthographic projection of the light-emitting element on the substrate, and the bonding layer connects the light-emitting element and the drive circuit layer; Choke posts, located on the side of the drive circuit layer away from the substrate and covered by the bonding layer, and the choke posts are at least partially disposed around the light-emitting element; The display panel includes a display area, the display area includes a first area and a second area, the second area at least partially surrounds the first area, and the choke posts include a first choke post located in the second area and a second choke post located in the first area; Wherein, the height of the first choke post is greater than the height of the second choke post.

2. The display panel according to claim 1, wherein The bonding layer includes a plurality of independent bonding structures located between the light-emitting element and the drive circuit layer; Or, the orthographic projection of the bonding layer on the substrate is a continuous projection.

3. The display panel according to claim 1, wherein The heights of the choke posts in the first area are the same.

4. The display panel according to claim 1, wherein, The second area includes a plurality of first light-emitting elements, the first choke post includes a first sub-choke post and a second sub-choke post, the second sub-choke post is located on the side of the first sub-choke post away from the first light-emitting element and on the side of the first light-emitting element away from the first area; Wherein, the height of the second sub-choke post is greater than the height of the first sub-choke post.

5. The display panel according to claim 4, characterized in that, The first choke post further includes a third sub-choke post, the third sub-choke post is located on the side of the second sub-choke post away from the first light-emitting element; the height of the third sub-choke post is greater than the height of the second sub-choke post.

6. The display panel according to claim 1, wherein The choke posts include a first row of choke posts and a second row of choke posts; both the first row of choke posts and the second row of choke posts are disposed around the light-emitting element, and the second row of choke posts is located on the side of the first row of choke posts away from the light-emitting element.

7. The display panel according to claim 6, characterized in that The orthographic projection of the first row of choke posts on the substrate is a continuous projection; and / or, The orthographic projection of the second row of choke posts on the substrate is a continuous projection.

8. The display panel according to claim 6, wherein The first row of choke posts includes a plurality of first row sub-choke posts, and the second row of choke posts includes a plurality of second row sub-choke posts; The plurality of first row sub-choke posts are arranged at equal intervals, and / or; the plurality of second row sub-choke posts are arranged at equal intervals.

9. The display panel according to claim 6, wherein The first row of choke posts includes a plurality of first row sub-choke posts, and the second row of choke posts includes a plurality of second row sub-choke posts; The first row of choke posts and the second row of choke posts are adjacent, and the first row sub-choke posts and the second row sub-choke posts are arranged in parallel or offset.

10. The display panel according to claim 1, characterized in that, The choke posts include a first group of choke posts, a second group of choke posts, a third group of choke posts and a fourth group of choke posts; The first group of choke posts and the third group of choke posts are disposed relative to the light-emitting element, and the second group of choke posts and the fourth group of choke posts are disposed relative to the light-emitting element.

11. The display panel according to claim 10, characterized in that, At least one of the first set of flow-blocking posts, the second set of flow-blocking posts, the third set of flow-blocking posts, and the fourth set of flow-blocking posts includes a plurality of sub-flow-blocking posts; the plurality of sub-flow-blocking posts are distributed in an array.

12. The display panel according to claim 1, wherein The material of the flow-blocking posts is a reflective material.

13. The display panel according to claim 12, wherein The light-emitting elements include red light-emitting elements, green light-emitting elements, and blue light-emitting elements; The reflectivity of the flow-blocking posts corresponding to the red light-emitting elements is greater than the reflectivity of the flow-blocking posts corresponding to the green light-emitting elements and greater than the reflectivity of the flow-blocking posts corresponding to the blue light-emitting elements.

14. The display panel according to claim 12, wherein, The light-emitting elements include red light-emitting elements, green light-emitting elements, and blue light-emitting elements; The arrangement density of the flow-blocking posts corresponding to the red light-emitting elements is greater than the arrangement density of the flow-blocking posts corresponding to the green light-emitting elements and greater than the arrangement density of the flow-blocking posts corresponding to the blue light-emitting elements.

15. The display panel according to claim 12, characterized in that, The light-emitting elements include red light-emitting elements, green light-emitting elements, and blue light-emitting elements; The height of the flow-blocking posts corresponding to the red light-emitting elements is greater than the height of the flow-blocking posts corresponding to the green light-emitting elements and greater than the height of the flow-blocking posts corresponding to the blue light-emitting elements.

16. The display panel according to claim 1, wherein, Along the thickness direction of the display panel, the height of the flow-blocking posts is less than the thickness of the bonding layer.

17. The display panel according to claim 1, wherein the orthographic projection of the side of the flow-blocking post away from the substrate on the substrate is smaller than the orthographic projection of the side of the flow-blocking post close to the substrate on the substrate, and the bottom angle α of the flow-blocking post facing the light-emitting element is an acute angle, Among them, The value range of α is 30° to 60°.

18. The display panel according to claim 17, wherein the surface of the flow-blocking post facing the light-emitting element is a flat surface or a concave surface.

19. The display panel according to claim 1, wherein, The minimum width of the cross-section of the flow-blocking posts ≥ 0.5 μm.

20. The display panel according to claim 1, wherein The cross-section of the flow-blocking posts includes a triangle, a rhombus, a square, a circle, and an irregular shape.

21. The display panel according to claim 1, characterized in that, The driving circuit layer includes a plurality of backplane electrode groups, and each backplane electrode group includes two backplane electrodes arranged at intervals; The bonding layer includes a groove area, and the groove area is located between the two backplane electrodes; The groove area includes one groove or a plurality of grooves, and the plurality of grooves are arranged in an array.

22. The display panel according to claim 21, wherein, Along the first direction, the length of the groove area is less than the length of the backplane electrode; along the second direction, the width of the groove area is less than the distance between the two backplane electrodes; Wherein, both the first direction and the second direction are parallel to the plane where the substrate is located, and the first direction and the second direction intersect.

23. The display panel according to claim 1, wherein The bonding layer includes an anisotropic conductive film.

24. A display device, characterized in that, Including the display panel according to any one of claims 1-23.

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