Display panel, manufacturing method for display panel, and display device

Abstract

The present application relates to the technical field of display, and discloses a display panel, a manufacturing method for the display panel, and a display device. The display panel comprises a driving backplane, a pixel defining layer, a plurality of pixel structures, a plurality of isolation structures, and a plurality of supporting structures, wherein the pixel defining layer is provided with a first opening and a second opening, the supporting structures are located on the side of the pixel defining layer facing away from the driving backplane, each supporting structure may comprise a supporting base and a supporting pad which are stacked in the direction away from the driving backplane, and the orthographic projection of the supporting pad on the driving backplane is located in the orthographic projection of the supporting base on the driving backplane. The stability of the supporting structure is ensured by means of the supporting base having a large size, and the contact area of the supporting pad and a mask is reduced by means of the supporting pad having a small size, so as to reduce the probability of scratching the supporting pad by the mask.

Description

Display panel, manufacturing method of display panel, and display device

[0001] The present application claims priority to the Chinese patent application No. 202410666696.5, filed on May 27, 2024, and entitled "Display panel, manufacturing method of display panel, and display device", the entire content of which is incorporated herein by reference. TECHNICAL FIELD

[0002] The present application relates to the technical field of display, in particular to a display panel, a manufacturing method of the display panel, and a display device. BACKGROUND

[0003] Display devices have a wide range of application scenarios in life, such as mobile phones, tablet computers, and other electronic devices. A display panel is an important component of a display device. A tandem organic light-emitting display device improves the service life and brightness of the light-emitting device by adding at least one light-emitting layer and a charge generation layer in the organic light-emitting device. SUMMARY

[0004] Embodiments of the present application provide a display panel, a manufacturing method of the display panel, and a display device. The technical solutions are as follows:

[0005] According to an aspect of the present application, a display panel is provided, which includes:

[0006] a driving backplane;

[0007] a pixel definition layer located on the driving backplane, the pixel definition layer including a plurality of first openings and a plurality of second openings;

[0008] a plurality of pixel structures including a light-emitting functional layer, the light-emitting functional layer being partially located in the first openings and partially extending into the second openings;

[0009] a plurality of isolation structures located between the light-emitting functional layer and the driving backplane, at least part of an edge of the isolation structure being located in the second openings, and at least part of the light-emitting functional layer located in the second openings being disconnected at the edge of the isolation structure;

[0010] a plurality of support structures located on a side of the pixel definition layer away from the driving backplane, and a normal projection of the support structure on the driving backplane being located in a normal projection of the pixel definition layer on the driving backplane;

[0011] The support structure comprises a support base and a support pad stacked in a direction away from the driving back plate, a projection of the support pad on the driving back plate is located in a projection of the support base on the driving back plate, and an area of the projection of the support base on the driving back plate is greater than an area of the projection of the support pad on the driving back plate.

[0012] Optionally, the support pad comprises a plurality of support columns, and projections of the plurality of support columns on the driving back plate are located in corresponding projections of the support base on the driving back plate.

[0013] Optionally, the projections of the plurality of support columns on the driving back plate are arranged around a first center, and the first center is a center of the projection of the support base on the driving back plate.

[0014] Optionally, the support base comprises a peripheral part and a filling part connected to each other, the filling part is located between the plurality of support columns, and the peripheral part surrounds the plurality of support columns.

[0015] The height of the peripheral part is less than the height of the filling part.

[0016] Optionally, the support column comprises a first top surface and a first bottom surface, and a first side surface for connecting the first top surface and the first bottom surface, and the first top surface is located on a side of the first bottom surface away from the driving back plate.

[0017] A dimension of the projection of the first top surface on the driving back plate in a direction parallel to the plate surface of the substrate is less than 4 microns.

[0018] Optionally, in the plurality of support structures, at least one of the support structures comprises a plurality of support bases and a plurality of support pads corresponding to the plurality of support bases one by one.

[0019] The projection of the support pad on the driving back plate is located in the projection of the corresponding support base on the driving back plate, and an area of the projection of the support base on the driving back plate is greater than an area of the projection of the corresponding support pad on the driving back plate.

[0020] Optionally, a first center of the projection of the support base on the driving back plate and a second center of the projection of the support pad on the driving back plate coincide.

[0021] Optionally, in a direction perpendicular to the driving back plate, a ratio of the height of the support base to the height of the support structure ranges from 20% to 70%.

[0022] Optionally, the support base comprises a second top surface, a second bottom surface and a second side surface connecting the second top surface and the second bottom surface, the second top surface is located on a side of the second bottom surface away from the driving backplate;

[0023] A first included angle between the second bottom surface and the second side surface ranges from 10° to 60°.

[0024] The support pad comprises a third top surface, a third bottom surface and a third side surface connecting the third top surface and the third bottom surface, the third top surface is located on a side of the third bottom surface away from the driving backplate;

[0025] A second included angle between the third bottom surface and the third side surface ranges from 10° to 60°.

[0026] Optionally, the display panel further comprises a cushion layer part, the cushion layer part is located on a side of the pixel defining layer away from the support structure, a normal projection of the support structure on the driving backplate is located in a normal projection of the cushion layer part on the driving backplate.

[0027] Optionally, the isolation structure and the cushion layer part are same layer structures formed by a same patterning process.

[0028] Optionally, a normal projection of the cushion layer part on the driving backplate is located in a normal projection of the pixel defining layer on the driving backplate; and a shortest distance between at least part of an edge of the isolation structure and an edge of the pixel defining layer covering the cushion layer part is greater than or equal to 4 microns.

[0029] Optionally, the pixel structure further comprises a first electrode and a second electrode located on two sides of the light emitting functional layer in a direction perpendicular to the driving backplate, the first electrode is located between the light emitting functional layer and the driving backplate;

[0030] The isolation structure is located between the first electrode and the driving backplate.

[0031] Optionally, a normal projection of the support structure on the driving backplate does not overlap with a normal projection of the isolation structure on the driving backplate.

[0032] Optionally, the second electrode and at least one layer of a plurality of film layers included in the light emitting functional layer overlap with a normal projection of the isolation structure on the driving backplate.

[0033] Optionally, the isolation structure comprises a first isolation part and a second isolation part connected, a normal projection of the first isolation part on the driving backplate is located in a normal projection of the second opening on the driving backplate;

[0034] A projection of the second isolation portion on the drive backplate overlaps with a projection of the pixel defining layer on the drive backplate, and a projection of the first electrode on the drive backplate is located in the projection of the second isolation portion on the drive backplate.

[0035] Optionally, the support structure is located between two adjacent first isolation portions.

[0036] Optionally, a projection of the second opening on the drive backplate is located between a projection of the first opening on the drive backplate and a projection of the support structure on the drive backplate.

[0037] According to another aspect of the present application, a manufacturing method of a display panel is provided, the method comprising:

[0038] forming a plurality of isolation structures on a drive backplate;

[0039] forming a pixel defining layer on the drive backplate with the plurality of isolation structures, the pixel defining layer comprising a plurality of first openings and a plurality of second openings;

[0040] forming a plurality of support structures on a side of the pixel defining layer away from the drive backplate, the support structures being located on the side of the pixel defining layer away from the drive backplate, and a projection of the support structures on the drive backplate is located in a projection of the pixel defining layer on the drive backplate.

[0041] the support structure comprises a support base and a support pad stacked in a direction away from the drive backplate, a projection of the support pad on the drive backplate is located in a projection of the support base on the drive backplate, and an area of the projection of the support base on the drive backplate is greater than an area of the projection of the support pad on the drive backplate.

[0042] forming a light emitting functional layer on the drive backplate with the plurality of support structures, a portion of the light emitting functional layer being located in the first opening, and a portion of the light emitting functional layer extending into the second opening, wherein the isolation structure is located between the light emitting functional layer and the drive backplate, at least a portion of an edge of the isolation structure is located in the second opening, and at least a portion of the light emitting functional layer located in the second opening is disconnected at the edge of the isolation structure. According to another aspect of the present application, a display device is provided, the display device comprising a power supply circuit and a display panel as described above, the power supply circuit supplying power to the display panel. BRIEF DESCRIPTION OF DRAWINGS

[0043] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings needed to be used in the embodiments will be briefly introduced. Obviously, the drawings in the following description only constitute some embodiments of the present application, and for those skilled in the art, other drawings can be obtained based on these drawings without creative labor.

[0044] FIG. 1 is a structural schematic diagram of a display panel;

[0045] FIG. 2 is a cross-sectional structural schematic diagram of the display panel along A1-A2 in FIG. 1;

[0046] FIG. 3 is a structural schematic diagram of a display panel provided by an embodiment of the present application;

[0047] FIG. 4 is a cross-sectional structural schematic diagram of the display panel along B1-B2 in FIG. 3;

[0048] FIG. 5 is a structural schematic diagram of another display panel provided by an embodiment of the present application;

[0049] FIG. 6 is a structural schematic diagram of a single-layer pixel structure and a series pixel structure;

[0050] FIG. 7 is a display effect and a structural schematic diagram of a display panel in a related art;

[0051] FIG. 8 is a structural schematic diagram of a display panel in a related art;

[0052] FIG. 9 is a cross-sectional structural schematic diagram of the display panel in FIG. 8 at a first position, a second position, a third position, a fourth position and a fifth position;

[0053] FIG. 10 is a structural schematic diagram of two support structures with different heights;

[0054] FIG. 11 is a structural schematic diagram of another display panel provided by an embodiment of the present application;

[0055] FIG. 12 is a structural schematic diagram of another display panel provided by an embodiment of the present application;

[0056] FIG. 13 is a structural schematic diagram of another display panel provided by an embodiment of the present application;

[0057] FIG. 14 is a structural schematic diagram of a display panel provided by an embodiment of the present application;

[0058] FIG. 15 is a cross-sectional structural schematic diagram of the display panel along C1-C2 in FIG. 14;

[0059] FIG. 16 is a structural schematic diagram of another display panel provided by an embodiment of the present application;

[0060] FIG. 17 is a structural schematic diagram of another display panel according to an embodiment of the present application;

[0061] FIG. 18 is a cross-sectional structural schematic diagram of the display panel along D1-D2 according to an embodiment of the present application;

[0062] FIG. 19 is a structural schematic diagram of another display panel according to an embodiment of the present application;

[0063] FIG. 20 is a structural schematic diagram of a support structure according to an embodiment of the present application;

[0064] FIG. 21 is a structural schematic diagram of another display panel according to an embodiment of the present application;

[0065] FIG. 22 is a structural schematic diagram of a peripheral region of a display panel according to an embodiment of the present application;

[0066] FIG. 23 is a cross-sectional structural schematic diagram of the display panel along E1-E2 according to an embodiment of the present application;

[0067] FIG. 24 is a structural schematic diagram of a peripheral region of a display panel according to an embodiment of the present application;

[0068] FIG. 25 is a cross-sectional structural schematic diagram of the display panel along F1-F2 according to an embodiment of the present application;

[0069] FIG. 26 is a flowchart of a manufacturing method of a display panel according to an embodiment of the present application;

[0070] FIG. 27 is a flowchart of another manufacturing method of a display panel according to an embodiment of the present application;

[0071] FIG. 28 is a flowchart of a manufacturing method of a display panel according to an embodiment of the present application.

[0072] The specific embodiments of the present application have been shown through the above-described drawings, and will be described in more detail hereinafter. The drawings and the written description are not intended to restrict the scope of the present application in any way, but to explain the present application to those skilled in the art by referring to a specific embodiment. DETAILED DESCRIPTION

[0073] In order to make the purpose, technical solutions and advantages of the present application more clear, the embodiments of the present application will be described in more detail below with reference to the drawings.

[0074] Referring to FIG. 1 and FIG. 2. FIG. 1 can be a schematic diagram of a partial film layer structure of a display area of a display panel 10. In FIG. 1, the outline of a film layer (such as a first electrode 14) located under a pixel definition layer 12 is represented by a dashed line, so as to more clearly represent the structure of the display panel. The display panel 10 can include a driving backplane 11, a pixel definition layer 12 located on the driving backplane 11, a support structure 13, and a plurality of pixel structures. The pixel definition layer 12 has a plurality of openings corresponding to the plurality of pixel structures, and a portion of the pixel structure is located in the corresponding opening. The pixel structure can include a light-emitting functional layer (not shown in the figure) having a plurality of film layers, and a first electrode 14 and a second electrode (not shown in the figure) located on both sides of the light-emitting functional layer in a direction perpendicular to the driving backplane 11. The first electrode 14 is located between the light-emitting functional layer and the driving backplane 11, and the first electrode 14 is an anode. The support structure 13 and the pixel definition layer 12 are a same layer structure, and the support structure 13 is used to support a high-precision mask plate for manufacturing the light-emitting functional layer.

[0075] However, the high-precision mask plate in the display panel 10 described above has a large contact area with the support structure 13, which is more likely to cause damage to the support structure 13, resulting in a low yield of the display panel 10.

[0076] Referring to FIG. 3, FIG. 4 and FIG. 5. FIG. 3 can be a schematic diagram of a partial film layer structure of a display area of a display panel 20. In FIG. 3, the outline of a film layer (such as a first electrode 232 and a separation structure 24) located under a pixel definition layer 22 is represented by a dashed line, so as to more clearly represent the structure of the display panel. The display panel 20 can include a driving backplane 21, a pixel definition layer 22 (English: Pixel Definition Layer; abbreviation: PDL), a plurality of pixel structures 23, a plurality of separation structures 24, and a plurality of support structures 25 (also referred to as columnar photo spacers; English: Photo spacer; abbreviation: PS).

[0077] The pixel definition layer 22 can be located on the driving backplane 21. The pixel definition layer 22 can include a plurality of first openings 221 and a plurality of second openings 222. The first openings 221 can be referred to as pixel openings. The plurality of first openings 221 can be arranged in an array, and each first opening 221 penetrates the pixel definition layer 22 in a thickness direction of the pixel definition layer 22. The pixel definition layer 22 can include a first spacing portion located between adjacent first openings 221 and second openings 222, and a second spacing portion 224 located between adjacent second openings 222. The area of the pixel definition layer 22 other than the first openings 221 and the second openings 222 is a continuous structure.

[0078] The pixel structure 23 comprises a light-emitting functional layer 231, the light-emitting functional layer 231 is partially located in the first opening 221, and part of the light-emitting functional layer 231 extends into the second opening 222. Optionally, the light-emitting functional layer 231 comprises at least two light-emitting material layers 2311 and a charge generation layer 2312 located between the at least two light-emitting material layers 2311. The light-emitting functional layer 231 in each first opening 221 corresponds to a sub-pixel. The light-emitting functional layers 231 in different first openings 221 can emit light of the same color or light of different colors. The plurality of sub-pixels corresponding to the plurality of first openings 221 can comprise a plurality of sub-pixels, such as red sub-pixels R, blue sub-pixels B, and green sub-pixels G. The plurality of sub-pixels can also comprise sub-pixels of other colors, which are not limited here. Exemplarily, the second opening 222 can be located between adjacent sub-pixels, and at least one second opening 222 is arranged between two adjacent first openings 221.

[0079] The plurality of isolation structures 24 are located between the light-emitting functional layer 231 and the driving back plate 21, at least part of the edges of the isolation structures 24 are located in the second opening 222, and at least part of the light-emitting functional layer 231 located in the second opening 222 is truncated at the edges of the isolation structures 24. That is, the second opening 222 of the pixel defining layer 22 is configured to expose at least part of the edges of the isolation structures 24, so that at least part of the light-emitting functional layer 231 extending into the second opening 222 is truncated by the edges of the isolation structures 24. Exemplarily, the light-emitting functional layer 231 comprises at least one common layer, the common layer is located in the first opening 221 and extends to the edges of the isolation structures 24 in the second opening 222 along the pixel defining layer 22. The light-emitting functional layer 231 can also comprise other film layers, the functions of the other film layers are different, and the extension positions can be different. For example, the other film layers in the light-emitting functional layer 231 can be located in the first opening 221 and extend to the first spacing portion 223 around the first opening 221 (not extend into the second opening 222), or can be located in the first opening 221 and extend to the edges of the isolation structures 24 in the second opening 222 along the first spacing portion 223, which are not limited here.

[0080] The support structure 25 can be located on the side of the pixel defining layer 22 away from the driving back plate 21, and the orthographic projection of the support structure 25 on the driving back plate 21 is located in the orthographic projection of the pixel defining layer 22 on the driving back plate 21. The support structure 25 can be located on the side of the second spacing portion 224 of the pixel defining layer 22 away from the driving back plate 21.

[0081] The support structure 25 can be used to support a mask plate for manufacturing the light-emitting functional layer 231. The support structure 25 is located on the pixel defining layer 22, and the orthographic projection of the support structure 25 on the drive backplate 21 does not overlap with the orthographic projection of the first opening 221 on the drive backplate 21, and the orthographic projection of the support structure 25 on the drive backplate 21 does not overlap with the orthographic projection of the second opening 222 on the drive backplate 21. In the process of manufacturing the display panel 20, the first opening 221 and the second opening 222 can be formed on the pixel defining layer 22 first, and the positions for forming the support structure 25 are reserved when the first opening 221 and the second opening 222 are formed. Subsequently, when the support structure 25 is formed in the pixel defining layer 22, the positions of the first opening 221 and the second opening 222 are avoided.

[0082] The support structure 25 can include a support base 251 and a support pad 252 stacked in a direction away from the drive backplate 21. The orthographic projection of the support pad 252 on the drive backplate 21 is located in the orthographic projection of the support base 251 on the drive backplate 21, and the area of the orthographic projection of the support base 251 on the drive backplate 21 is greater than the area of the orthographic projection of the support pad 252 on the drive backplate 21.

[0083] In this way, by stacking the support base 251 and the support pad 252 on the pixel defining layer 22, the stability of the support structure 25 is ensured by the support base 251 with a larger size, and the contact area between the support pad 252 and the mask plate is reduced by the support pad 252 with a smaller size, so as to reduce the probability of the mask plate scratching the support pad 252.

[0084] In summary, the embodiments of the present application provide a display panel including a drive backplate, a pixel defining layer, a plurality of pixel structures, a plurality of isolation structures, and a plurality of support structures. The pixel defining layer has a first opening and a second opening. The support structure is located on a side of the pixel defining layer away from the drive backplate. The support structure can include a support base and a support pad stacked in a direction away from the drive backplate. The orthographic projection of the support pad on the drive backplate is located in the orthographic projection of the support base on the drive backplate. The stability of the support structure is ensured by the support base with a larger size, and the contact area between the support pad and the mask plate is reduced by the support pad with a smaller size, so as to reduce the probability of the mask plate scratching the support pad. Therefore, the yield of the display panel can be improved.

[0085] In addition, by forming the stacked support base and support pad on the pixel defining layer, the distance between the end of the support structure away from the drive backplate and the drive backplate can be increased, that is, the height of the support structure is increased. When the support structure is used to support the mask plate, the distance between the mask plate and the light-emitting functional layer can be increased, so as to avoid the mask plate scratching the light-emitting functional layer, and the yield of the display panel can be further improved.

[0086] In an exemplary embodiment, the material of the support pad 252 and the material of the support base 251 can be the same. For example, the material of the support pad 252 and the material of the support base 251 can be negative photoresist or positive photoresist. The longitudinal section of the support pad 252 and the longitudinal section of the support base 251 can both be a regular trapezoid. The support pad 252 and the support base 251 can be formed simultaneously (i.e., formed by one patterning process), and the shape of the longitudinal section of the support pad 252 can be similar to the shape of the longitudinal section of the support base 251.

[0087] For example, a first material layer can be formed on the driving backplane 21 with an anode formed thereon, and the first opening 221 and the second opening 222 can be formed by one patterning process to form the pixel defining layer 22. A second material layer can be formed on the driving backplane 21 with the pixel defining layer 22 formed thereon, and the second material layer can be subjected to one patterning process by using a half-tone mask to form the support base 251 and the support pad 252, so as to simplify the process flow. In addition, the height and the slope angle of the support base 251 and the support pad 252 can be adjusted by adjusting the transmittance of the half-tone mask, and the process tolerance can be further increased.

[0088] Please refer to FIGS. 6, 7, 8 and 9. FIG. 9 is a cross-sectional structure schematic diagram of the display panel 10 at the first position w1, the second position w2, the third position w3, the fourth position w4 and the fifth position w5. The black arrow in FIG. 8 indicates the arrangement direction from the first position to the fifth position. As shown in FIG. 6, the tandem pixel structure can include a stacked anode, a first light-emitting functional layer (RGB), a first hole blocking layer (HBL), an N-type charge generation layer (N-CGL), a P-type charge generation layer (P-CGL), a hole transport layer (HTL), a second light-emitting functional layer 231, a second hole blocking layer, an electron transport layer (ETL) and a cathode. The single pixel structure 23 can include a stacked anode, a light-emitting functional layer (RGB), a hole blocking layer (HBL), an electron transport layer (ETL) and a cathode.

[0089] Compared with the single-layer pixel structure 23A, the number of layers of the light-emitting functional layer 231 of the tandem pixel structure 23B is larger, the height of the tandem pixel structure 23B is higher, and in the process of manufacturing the tandem pixel structure 23B, the number of fine metal masks (Fine Metal Mask; FMM for short) used is 5-8. In the case of the same height of the support structure 25, in the process of manufacturing the tandem pixel structure 23B, the film layers in the tandem pixel structure 23B are more likely to be scratched by the fine metal mask. The pixel structure 23 can include an organic light-emitting device, such as a Single OLED (S OLED for short) or a Tandem OLED (T OLED for short). The pixel structure 23 in the embodiments of the present application can include a Tandem OLED.

[0090] As shown in FIGS. 7, 8 and 9, the pixel structure 23 in the display panel 10 in the related art can also include a tandem pixel structure. When the fine metal mask scratches the light-emitting functional layer 231 in the pixel structure 23, if the degree of scratching is light, it will cause the EL (Electro Luminescence; EL for short) material of part of the light-emitting functional layer 231 in the pixel structure 23 to be missing, and then cause the corresponding sub-pixel of the pixel structure 23 to have abnormal local brightness (i.e., a bright spot L1) when the display panel 10 is lit up, that is, the sub-pixel with the bright spot L1 is overall dark, and the local brightness is much larger than other areas. If the degree of scratching is heavy, it will cause the EL material in the pixel structure 23 to be completely missing, and then cause the corresponding sub-pixel of the pixel structure 23 to be unable to emit light when the display panel 10 is lit up, thereby appearing as a dark spot.

[0091] Please refer to FIG. 1 and FIG. 10, in the prior art, the support structure 13 and the pixel defining layer 12 are in the same layer structure, in the process of forming the support structure 13 and the pixel defining layer 12, a first material layer (PDL Coating) can be patterned by using a half-tone mask, by setting the transmittance of different areas of the half-tone mask to adjust the film thickness of the support structure 13 and the pixel defining layer 12. For example, the transmittance of the half-tone mask in the area corresponding to the first opening and the second opening of the pixel defining layer 12 is 100%, the transmittance of the area corresponding to the structure between the first opening and the second opening is 20%-29%, and the transmittance of the area corresponding to the support structure 13 is 0%, so that the support structure 13 and the pixel defining layer 12 can be formed by one patterning process of the first material layer. However, such a manufacturing method cannot separately adjust the thickness and slope angle of the support structure 13 and the pixel defining layer 12. If the height of the support structure 13 needs to be increased, the thickness of the first material layer needs to be increased first, which leads to a decrease in production capacity, and when the thickness of the first material layer is relatively thick, the morphology of the formed support structure 13 is poor. For example, the slope angle of the support structure 13 is large, which increases the risk of film layer peeling of the support structure 13 and the pixel defining layer 12 in the subsequent manufacturing process. At the same time, when there is a display light transmission area (AA Hole) in the display panel 10, there is a risk of residual first material layer in the display light transmission area. Therefore, the method of increasing the height of the support structure 13 by directly thickening the first material layer will lead to a low yield of the display panel 10.

[0092] Compared with the prior art, in the embodiment of the present application, the support base 251 and the support pad 252 are stacked on the pixel defining layer 22 to increase the height of the support structure 25, which can avoid scratching the light-emitting functional layer by the metal mask, thereby improving the yield of the light-emitting functional layer and the yield of the display panel 20.

[0093] In an exemplary embodiment, referring to FIG. 5, the multiple film layers of the light-emitting functional layer 231 can include a first light-emitting layer, a charge generation layer 2312, and a second light-emitting layer stacked together, with the charge generation layer 2312 between the first light-emitting layer and the second light-emitting layer. The charge generation layer 2312 is configured to provide carriers for its adjacent two film layers, and has strong conductivity, which can make the first light-emitting layer and the second light-emitting layer have the advantages of long service life, low power consumption, and high brightness. For example, compared with the light-emitting functional layer 231 without the charge generation layer 2312, the light-emitting brightness of the sub-pixel can be increased by nearly one time by setting the charge generation layer 2312 in the light-emitting functional layer 231. The charge generation layer 2312 can include an N-type charge generation layer 2312 and a P-type charge generation layer 2312. The light-emitting functional layer 231 can further include a hole injection layer (HIL), a hole transport layer (HTL), an electron transport layer (ETL), and an electron injection layer (EIL). The hole injection layer, the hole transport layer, the electron transport layer, the electron injection layer, and the charge generation layer 2312 are common film layers of the multiple sub-pixels, which can be referred to as common layers. For example, at least one common layer includes the charge generation layer 2312.

[0094] In the present embodiment, the second opening 222 is arranged in the pixel defining layer 22, and at least part of the edge of the isolation structure 24 is exposed in the second opening 222. The common layers in the light-emitting functional layer 231 extend from the first opening 221 along the first spacing portion 223 and the inner surface of the second opening 222 to the edge of the isolation structure 24, and the common layers between adjacent sub-pixels are blocked at the edge of the isolation structure 24, i.e., the crosstalk path between the sub-pixels is blocked, which effectively reduces the crosstalk between the sub-pixels and improves the display effect.

[0095] The states of different common layers at the edge of the isolation structure 24 can be the same or different. For example, all the common layers are blocked at the edge of the isolation structure 24, or part of the common layers are blocked at the edge of the isolation structure 24, and the other part of the common layers are not blocked at the edge of the isolation structure 24.

[0096] In an exemplary embodiment, all the common layers are blocked at the edge of the isolation structure 24. As shown in FIG. 5, the common layers extend along the inner surface of the second opening 222 to the edge of the isolation structure 24, and cover at least part of the upper surface of the isolation structure 24 (i.e., the surface of the isolation structure 24 away from the driving backplate 21), but do not cover the side surface of the isolation structure 24, i.e., the common layers on the upper surface of the isolation structure 24 are disconnected from the common layers on the bottom surface of the second opening 222, so that the common layers are blocked at the edge of the isolation structure 24. In this way, the crosstalk path between the sub-pixels can be blocked, and the crosstalk between the sub-pixels can be effectively reduced.

[0097] Please refer to FIG. 11 and FIG. 12, it can be understood that FIG. 11 and FIG. 12 respectively show different shapes of the plurality of film layers in the display panel 20, the specific shape of the plurality of film layers in the display panel 20 is not limited in the application, in an alternative embodiment, the display panel 20 can further include the pad layer 26, the pixel structure 23 can further include the first electrode 232 and the second electrode (not shown in the figure) located on both sides of the light-emitting functional layer 231 in the direction perpendicular to the driving back plate 21, the first electrode 232 is located between the light-emitting functional layer 231 and the driving back plate 21. The pixel defining layer 22 is located on the side of the first electrode 232 away from the driving back plate 21, a plurality of first openings 221 in the pixel defining layer 22 correspond one-to-one to the positions of the first electrode 232 in the plurality of pixel structures 23, the first openings 221 are configured to expose the first electrode 232. When the light-emitting functional layer 231 is formed in the first openings 221 of the pixel defining layer 22, the first electrode 232 and the second electrode located on both sides of the light-emitting functional layer 231 can drive the light-emitting functional layer 231 in the first openings 221 to emit light. For example, the first electrode 232 can be electrically connected with the driving back plate 21, the driving back plate 21 can provide a driving signal for the first electrode 232 to drive the light-emitting functional layer 231 to emit light. Here, the first openings 221 of the pixel defining layer 22 are used to define the light-emitting area of the pixel structure 23, the light-emitting area can refer to the area in which the sub-pixel effectively emits light, the shape of the orthographic projection of the light-emitting area on the driving back plate 21 can be the same as the shape of the orthographic projection of the first openings 221 on the driving back plate 21.

[0098] The isolation structure 24 can be located between the first electrode 232 and the driving back plate 21. The thickness of the isolation structure 24 can be 150 angstroms to 5000 angstroms. For example, the thickness of the isolation structure 24 can be 200 angstroms to 500 angstroms. For example, the thickness of the isolation structure 24 can be 300 angstroms to 1000 angstroms. For example, the thickness of the isolation structure 24 can be 400 angstroms to 2000 angstroms. For example, the thickness of the isolation structure 24 can be 600 angstroms to 1500 angstroms.

[0099] In an exemplary embodiment, as shown in FIG. 11, the display panel 20 further comprises a flat layer 27 (Pixel Definition Layer; PLN for short) between the isolation structure 24 and the driving back plate 21. In the manufacturing process of the display panel 20, the isolation structure 24 can be formed on the flat layer 27 first, and then the first electrode 232 is formed on the isolation structure 24. This is because the flatness of the surface of the flat layer 27 under the isolation structure 24 can be affected in the process of forming the isolation structure 24. Therefore, by forming the first electrode 232 on the isolation structure 24, the flatness of the flat layer 27 can be prevented from affecting the film quality of the first electrode 232, so as to reduce the probability of display failure. For example, the orthographic projection of the first electrode 232 on the driving back plate 21 is located in the orthographic projection of the isolation structure 24 on the driving back plate 21.

[0100] The material of the isolation structure 24 comprises inorganic non-metallic material. For example, the material of the isolation structure 24 can comprise any one or more of silicon nitride, silicon oxide or silicon oxynitride.

[0101] The cushion layer 26 can be located on the side of the pixel definition layer 22 away from the support structure 25, and the orthographic projection of the support structure 25 on the driving back plate 21 is located in the orthographic projection of the cushion layer 26 on the driving back plate 21. The material of the cushion layer 26 can be at least one of inorganic non-metallic material, metallic material or organic non-metallic material, and the thickness of the cushion layer 26 can be 150 angstroms to 5000 angstroms. For example, the thickness of the cushion layer 26 can be 200 angstroms to 500 angstroms. For example, the thickness of the cushion layer 26 can be 300 angstroms to 1000 angstroms. For example, the thickness of the cushion layer 26 can be 400 angstroms to 2000 angstroms. For example, the thickness of the cushion layer 26 can be 600 angstroms to 1500 angstroms. In this way, by arranging the cushion layer 26 under the support structure 25, on the one hand, the height of the support structure 25 can be increased, and on the other hand, the film uniformity of the display panel 20 can be improved.

[0102] In an alternative embodiment, the isolation structure 24 and the cushion layer 26 are the same layer structure formed by the same patterning process. In this way, the film uniformity of the display panel 20 can be further improved, and the manufacturing process of the display panel 20 can be simplified.

[0103] Referring to FIG. 13, the isolation structure 24 and the first electrode 232 can be a same layer structure formed by a same patterning process. For example, the first electrode 232 can be made of a metal material, such as any one or more of magnesium (Mg), silver (Ag), copper (Cu), aluminum (Al), titanium (Ti), and molybdenum (Mo), or an alloy material of the above-mentioned metals, such as aluminum-neodymium alloy (AlNd) or molybdenum-niobium alloy (MoNb), can be a single layer structure, or a multi-layer composite structure, such as Ti / Al / Ti, or a stack structure of a metal and a transparent conductive material, such as ITO / Ag / ITO, Mo / AlNd / ITO, or the like reflective material.

[0104] Referring to FIGS. 11 and 13, in an alternative embodiment, the orthographic projection of the pad portion 26 on the drive backplate 21 can be located in the orthographic projection of the pixel defining layer 22 on the drive backplate 21. That is, the second spacing portion 224 in the pixel defining layer 22 can wrap around the edge of the pad portion 26. In this way, on the one hand, the area of the orthographic projection of the second spacing portion 224 in the pixel defining layer 22 on the drive backplate 21 can be as large as possible, so as to increase the area of the region of the pixel defining layer 22 for disposing the support structure 25; on the other hand, when the material of the pad portion 26 includes a metal, the pad portion 26 can be encapsulated and protected by the pixel defining layer 22, so as to improve the stability of the pad portion 26.

[0105] Referring to FIGS. 11 and 13, in an alternative embodiment, the shortest distance x1 between at least part of the edge of the isolation structure 24 and the edge of the pixel defining layer 22 covering the pad portion 26 is greater than or equal to 4 microns. In this way, it can be ensured that at least part of the isolation structure 24 can effectively isolate at least part of the light-emitting functional layer 231.

[0106] In an alternative embodiment, referring to FIG. 11, the orthographic projection of the support structure 25 on the drive backplate 21 and the orthographic projection of the isolation structure 24 on the drive backplate 21 do not overlap each other. In this way, the influence of the support structure 25 on the isolation effect of the isolation structure 24 on the light-emitting functional layer 231 can be avoided.

[0107] In an alternative embodiment, referring to FIG. 11, the isolation structure 24 comprises a first isolation portion 241 and a second isolation portion 242 connected together, the first isolation portion 241 is located in the orthographic projection of the second opening 222 on the driving back plate 21. The orthographic projection of the second isolation portion 242 on the driving back plate 21 overlaps with the orthographic projection of the pixel defining layer 22 on the driving back plate 21, and the orthographic projection of the first electrode 232 on the driving back plate 21 is located in the orthographic projection of the second isolation portion 242 on the driving back plate 21. That is, the area of the isolation structure 24 exposed by the second opening 222 is the first isolation portion 221, and the area between the first electrode 231, the pixel defining layer 22 and the driving back plate 21 is the second isolation portion 222. The first isolation portion 221 is used to isolate the light emitting functional layer 231, the second isolation portion 222 is used to improve the film flatness of the first electrode 232, and the first isolation portion 241 and the second isolation portion 242 can be an integrated structure.

[0108] In an alternative embodiment, referring to FIG. 14, the support structure 25 is located between two adjacent first isolation portions 241. The first isolation portion 241 can be located between two adjacent sub-pixels, and there can be two first isolation portions between the two adjacent sub-pixels, and the support structure 25 can be located between the end portions of the two adjacent first isolation portions 241.

[0109] In an alternative embodiment, the second electrode and at least one of the multiple film layers included in the light emitting functional layer 231 overlap with the orthographic projection of the isolation structure 24 on the driving back plate 21. At least part of the at least one of the multiple film layers included in the light emitting functional layer 231 covers part of the side surface of the isolation structure 24.

[0110] In an alternative embodiment, the orthographic projection of the second opening 222 on the driving back plate 21 is located between the orthographic projection of the first opening 221 on the driving back plate 21 and the orthographic projection of the support structure 25 on the driving back plate 21.

[0111] Please refer to FIG. 14, FIG. 15 and FIG. 16, it can be understood that FIG. 15 and FIG. 16 are different shapes of the plurality of film layers in the display panel 20, and the specific shape of the plurality of film layers in the display panel 20 is not limited in the present application. In an alternative embodiment, the support pad 252 can include a plurality of support columns 2521, and the orthogonal projection of the plurality of support columns 2521 on the driving back plate 21 is located in the orthogonal projection of the corresponding support base 251 on the driving back plate 21. That is, a plurality of support columns 2521 can be arranged on a support base 251, and the heights of the plurality of support columns 2521 can be the same, so that the plurality of support columns 2521 can be used together to support the fine metal mask, and the area of the orthogonal projection of the support base 251 on the driving back plate 21 is greater than the sum of the areas of the orthogonal projections of the plurality of support columns 2521 on the driving back plate 21.

[0112] In an exemplary embodiment, the material of the plurality of support columns 2521 and the material of the support base 251 can be the same. The plurality of support columns 2521 and the support base 251 can be formed at the same time (i.e., formed by using one patterning process). The number of the plurality of support columns 2521 can be 2, 3, 4 or more, and the embodiments of the present application do not limit this. In this way, the plurality of support columns 2521 and the support base 251 can be an integral structure, which can increase the stability of the support structure 25. That is, through the structure of one support base 251 corresponding to a plurality of support columns 2521, the stress of the support structure 25 in supporting the fine metal mask can be dispersed, and the contact area between the support column 2521 and the fine metal mask can be further reduced, and the plurality of support columns 2521 share one support base 251, which can improve the stability of the support structure 25.

[0113] Please refer to FIG. 14, in an alternative embodiment, the orthogonal projection of the plurality of support columns 2521 on the driving back plate 21 can be arranged around a first center, and the first center is the center of the orthogonal projection of the support base 251 on the driving back plate 21. In this way, the stress of the plurality of support columns 2521 in supporting the fine metal mask can be more uniform.

[0114] Please refer to FIG. 16, in an alternative embodiment, the support base 251 can include a connected peripheral portion 2511 and a filling portion 2512, the filling portion 2512 is located between the plurality of support columns 2521, and the peripheral portion 2511 surrounds the plurality of support columns 2521; the height of the peripheral portion 2511 is less than the height of the filling portion 2512. Since the filling portion 2512 is located between the plurality of support columns 2521, in the process of manufacturing the support structure 25, the transmittance of the half-tone mask corresponding to the filling portion 2512 can be less than the transmittance of the half-tone mask corresponding to the peripheral portion 2511, so as to reduce the impact on the support column 2521 when forming the filling portion 2512.

[0115] Referring to FIG. 15, in an optional embodiment, the support column 2521 can include a first top surface s11, a first bottom surface s12, and a first side surface s13 connecting the first top surface s11 and the first bottom surface s12, the first top surface s11 being located on a side of the first bottom surface s12 away from the driving back plate 21; a size of a projection of the first top surface s11 on the driving back plate 21 in a direction parallel to the plate surface of the substrate is less than 4 microns. The first top surface s11 can be a part of the surface of the support column 2521 that can be in contact with the fine metal mask, for example, a projection of the first top surface s11 on the driving back plate 21 is a circle, and a diameter of the circle can be less than 4 microns. In this way, by arranging the support pad 252 on the plurality of support columns 2521, the contact area of the support structure 25 and the fine metal mask can be reduced, and thus the risk of the fine metal mask scratching the support pad 252 can be reduced.

[0116] Optionally, a distance between two adjacent support columns 2521 can be less than 4 microns.

[0117] Referring to FIGS. 17, 18, and 19, it can be understood that FIGS. 18 and 19 respectively show different shapes of the plurality of film layers in the display panel 20, and the specific shape of the plurality of film layers in the display panel 20 is not limited in the present application. In an optional embodiment, of the plurality of support structures 25, at least one support structure 25 includes a plurality of support bases 251 and a plurality of support pads 252 corresponding to the plurality of support bases 251; a projection of the support pad 252 on the driving back plate 21 is located in a projection of the corresponding support base 251 on the driving back plate 21, and an area of the projection of the support base 251 on the driving back plate 21 is greater than an area of the projection of the corresponding support pad 252 on the driving back plate 21. In this way, the stress of the support structure 25 in supporting the fine metal mask can be dispersed, and the contact area of the support column 2521 and the fine metal mask can be further reduced, and the support range of the support structure 25 can also be expanded.

[0118] The size of the projection of the support base 251 on the driving back plate 21 can be 8*8 microns, a distance between two adjacent support bases 251 can be greater than 4 microns, and a size of a projection of the second spacing portion 224 in the pixel definition layer 22 on the driving back plate 21 is greater than 20 microns.

[0119] Referring to FIGS. 18 and 19, in an optional embodiment, a first center of the projection of the support base 251 on the driving back plate 21 and a second center of the projection of the support pad 252 on the driving back plate 21 coincide. Since the support base 251 can support the support pad 252, the centers of the support base 251 and the support pad 252 coincide, which can make the pressure of the support pad 252 on the support base 251 more uniform.

[0120] Referring to FIG. 12, in an optional embodiment, the ratio of the height of the support base 251 to the height of the support structure 25 ranges from 20% to 70% in the direction perpendicular to the driving back plate 21. Within this range, the support base 251 can better support and protect the support pad 252, so as to improve the overall structural strength of the support structure 25.

[0121] Referring to FIG. 20, in an optional embodiment, the support base 251 includes a second top surface s21, a second bottom surface s22, and a second side surface s23 connecting the second top surface s21 and the second bottom surface s22, the second top surface s21 is located on the side of the second bottom surface s22 away from the driving back plate 21; the first included angle a1 between the second bottom surface s22 and the second side surface s23 ranges from 10° to 60°; the support pad 252 includes a third top surface s31, a third bottom surface s32, and a third side surface s33 connecting the third top surface s31 and the third bottom surface s32, the third top surface s31 is located on the side of the third bottom surface s32 away from the driving back plate 21; the second included angle a2 between the third bottom surface s32 and the third side surface s33 ranges from 10° to 60°.

[0122] Referring to FIG. 21, in the display panel 10 in the related art, the size of the orthographic projection of the support structure 13 on the driving back plate 11 can be 10*10 μm (micrometer), the slope angle a3 of the support structure 13 ranges from 30° to 50°, the height of the support structure 13 ranges from 2 μm to 3 μm, and the top surface size of the support structure 13 is greater than 4 μm. The slope angle of the support structure 13 is relatively steep, and the top surface area of the support structure 13 is relatively large, which leads to poor support effect of the support structure 13 on the fine metal mask, and is prone to scratching the fine metal mask.

[0123] In the embodiments of the present application, referring to FIG. 13 and FIG. 20, the size of the orthographic projection of the support structure 25 on the driving back plate 21 can be 10*10 μm, wherein the size of the orthographic projection of the support pad 252 on the driving back plate 21 can be less than 10*10 μm, the size of the first included angle α1 and the second included angle α2 can be adjusted by adjusting the transmittance of the half-tone mask (the adjustment range of the transmittance can be 10% to 30%) and the film thickness of the second material layer, for example, the range of the first included angle α1 and the second included angle α2 can both be 20° to 30°, so that the height of the support structure 25 rises as gently as possible. In addition, the slope angle of the pixel defining layer 22 can also be 20° to 30°. In addition, the pixel defining layer 22 and the support structure 25 are distributed by two mask plates, and the thickness of the pixel defining layer 22 can be adjusted to be 0.8 μm to 1.5 μm by adjusting the film thickness of the first material layer. The height of the support structure 25 can be 0.1 μm to 4 μm. For example, when the thickness of the pixel defining layer 22 is 0.8 μm and the height of the support structure 25 is 3 μm, the total height of the second spacing portion 224 of the pixel defining layer 22 and the support structure 25 can be 3.8 μm, so that the fine metal mask can be effectively supported to avoid scratching the light emitting material layer 2311.

[0124] Referring to FIG. 22, FIG. 23, FIG. 24 and FIG. 25, the display panel 10 can include a display (AA) area and a peripheral area surrounding the display area, and the support structure 13 in the peripheral area can be annular. In the related art, the height of the support structure 13 is 1 μm to 2 μm, and the support capability of the support structure 13 for the evaporation mask (English: Evaporation Open Mask; abbreviation: EV OM) is poor, which leads to low quality of at least part of the metal film layer in the peripheral area, and leads to high electrostatic discharge (ESD) risk of the display panel 20.

[0125] In the embodiments of the present application, the annular support pad 252 is arranged on the side of the annular support base 251 away from the driving back plate 21, and the range of the first included angle α1 and the second included angle α2 of the support pad 252 and the support base 251 is 20° to 30°, and the height of the annular support structure 25 can be 2 μm to 5 μm, so as to improve the support capability of the support structure 25 for the evaporation mask, improve the quality of at least part of the metal film layer in the peripheral area, and reduce the electrostatic discharge risk of the display panel 20.

[0126] Optionally, the display panel 20 further includes a conductive pattern 28 between the pixel defining layer 22 and the driving back plate 11, and the conductive pattern 28 can be a VSS line, and the conductive pattern 28 can have an out gass (English: Out Gass; abbreviation: OG) hole.

[0127] It should be noted that the other film layers between the planar layer 27 and the driving back plate 21 are not shown in the drawings (such as FIG. 4) in the embodiments of the present application, such as pixel circuits, various signal lines and other insulating layers electrically connected with the light emitting elements, and the display panel 20 can include the planar layer 27, a passivation layer, a buffer layer, a gate insulating layer, an interlayer insulating layer, etc., which are not limited in the embodiments of the present application.

[0128] In summary, the embodiments of the present application provide a display panel including a driving back plate, a pixel defining layer, a plurality of pixel structures, a plurality of isolation structures and a plurality of support structures. The pixel defining layer has a first opening and a second opening, and the support structure is located on the side of the pixel defining layer away from the driving back plate. The support structure can include a support base and a support pad stacked in a direction away from the driving back plate, and the orthographic projection of the support pad on the driving back plate is located in the orthographic projection of the support base on the driving back plate. The stability of the support structure is ensured by the larger size of the support base, and the contact area between the support pad and the mask plate is reduced by the smaller size of the support pad, thereby reducing the probability of the mask plate scratching the support pad, so that the yield of the display panel can be improved.

[0129] In addition, the formation of the stacked support base and support pad on the pixel defining layer can increase the distance between the end of the support structure away from the driving back plate and the driving back plate, that is, the height of the support structure is increased. When the support structure is used to support the mask plate, the distance between the mask plate and the light emitting functional layer can be increased, which can avoid the mask plate scratching the light emitting functional layer, and the yield of the display panel can be further improved.

[0130] FIG. 26 is a flow chart of a manufacturing method of a display panel provided by an embodiment of the present application, which can be used to manufacture the display panel provided by the above embodiments. As shown in FIG. 26, the method includes:

[0131] Step 201, forming a plurality of isolation structures on the driving back plate.

[0132] Step 202, forming a pixel defining layer on the driving back plate with the plurality of isolation structures.

[0133] The pixel defining layer includes a plurality of first openings and a plurality of second openings.

[0134] Step 203, forming a plurality of support structures on the side of the pixel defining layer away from the driving back plate.

[0135] The support structure is located on a side of the pixel definition layer away from the driving backplate, and a projection of the support structure on the driving backplate is located in a projection of the pixel definition layer on the driving backplate. The support structure includes a support base and a support pad stacked in a direction away from the driving backplate, a projection of the support pad on the driving backplate is located in a projection of the support base on the driving backplate, and an area of the projection of the support base on the driving backplate is greater than an area of the projection of the support pad on the driving backplate.

[0136] Step 204, forming a light-emitting functional layer on the driving backplate with the support structure.

[0137] The light-emitting functional layer includes at least two light-emitting material layers and a charge generation layer located between the at least two light-emitting material layers, a part of the light-emitting functional layer is located in the first opening, and a part of the light-emitting functional layer extends into the second opening. The isolation structure is located between the light-emitting functional layer and the driving backplate, at least part of the edge of the isolation structure is located in the second opening, and at least part of the light-emitting functional layer located in the second opening is disconnected at the edge of the isolation structure.

[0138] FIG. 27 is a flowchart of another method for manufacturing a display panel according to an embodiment of the present application. The method can be used to manufacture the display panel according to the above embodiments. The manufacturing process of the display panel can refer to FIG. 28, which is a flowchart of the manufacturing process of the display panel shown in FIG. 15. As shown in FIG. 27, the method includes the following steps:

[0139] Step 301, providing a driving backplate.

[0140] Optionally, the driving backplate can be a flexible substrate, which can be made of a flexible material (for example, a polyimide (PI) material). Alternatively, the driving backplate can be a glass substrate.

[0141] Step 302, forming a planarization layer on the driving backplate.

[0142] The material of the planarization layer can include an organic material, or any one or more of silicon oxide (SiOx), silicon nitride (SiNx), and silicon oxynitride (SiON).

[0143] Step 303, forming a plurality of isolation structures on the driving backplate with the planarization layer.

[0144] The inorganic non-metallic material layer can be formed on the planarization layer and patterned. For example, the inorganic non-metallic material layer is patterned by etching the inorganic non-metallic material layer 030 using a dry etching method to form the plurality of isolation structures.

[0145] Step 304, forming a plurality of first electrodes on the driving backplate with the plurality of isolation structures.

[0146] After forming the isolation structure, a first electrode of the pixel structure is patterned on a side of the isolation structure facing away from the driving backplane.

[0147] Step 305, forming a pixel defining layer on the driving backplane with the first electrode.

[0148] The pixel defining layer includes a plurality of first openings and a plurality of second openings. The material of the pixel defining layer can include polyimide, acrylic, polyethylene terephthalate, etc.

[0149] A first material layer is coated on the driving backplane with the first electrode, and the pixel defining layer is formed by a mask, exposure, and development process. The first material layer in the first openings and the second openings of the pixel defining layer is developed away, the first openings can expose at least part of the surface of the first electrode of the plurality of pixel structures, and the second openings can expose at least part of the edge of the isolation structure.

[0150] Step 306, forming a plurality of support structures on the side of the pixel defining layer facing away from the driving backplane.

[0151] After forming the pixel defining layer, the support structure can be formed on the pixel defining layer. For example, a second material layer is coated on the driving backplane with the pixel defining layer, the second material layer can include an organic material film, and the support structure is formed by a mask, exposure, and development process. The support structure can be used as a support layer to support a fine metal mask during evaporation. A half-tone mask can be used to pattern the second material layer once to form a support base and a support pad, thereby simplifying the process flow.

[0152] The support structure is located on the side of the pixel defining layer facing away from the driving backplane, and the orthographic projection of the support structure on the driving backplane is located in the orthographic projection of the pixel defining layer on the driving backplane. The support structure includes a support base and a support pad stacked in a direction away from the driving backplane, the orthographic projection of the support pad on the driving backplane is located in the orthographic projection of the support base on the driving backplane, and the area of the orthographic projection of the support base on the driving backplane is greater than the area of the orthographic projection of the support pad on the driving backplane.

[0153] The support structure can be used to support a mask for manufacturing a light-emitting functional layer. The support structure is located on the pixel defining layer, the orthographic projection of the support structure on the driving backplane does not overlap with the orthographic projection of the first opening on the driving backplane, and the orthographic projection of the support structure on the driving backplane does not overlap with the orthographic projection of the second opening on the driving backplane. In the process of manufacturing the display panel, the first opening and the second opening can be formed on the pixel defining layer first, and the position for forming the support structure is reserved when the first opening and the second opening are formed. The position of the first opening and the second opening is avoided when the support structure is formed in the pixel defining layer subsequently.

[0154] Step 307, forming a light-emitting functional layer on the driving back plate with the support structure.

[0155] The light-emitting functional layer includes at least two light-emitting material layers and a charge generation layer between the at least two light-emitting material layers, a part of the light-emitting functional layer is in the first opening, and a part of the light-emitting functional layer extends into the second opening. The isolation structure is between the light-emitting functional layer and the driving back plate, at least part of the edge of the isolation structure is in the second opening, and at least part of the light-emitting functional layer in the second opening is disconnected at the edge of the isolation structure. The light-emitting functional layer can include a hole injection layer, a hole transport layer, an electron transport layer, an electron injection layer, and a charge generation layer. At least one of the plurality of film layers can be referred to as a common layer. For example, the at least one common layer includes the charge generation layer.

[0156] The second opening is arranged in the pixel defining layer, at least part of the edge of the isolation structure is exposed in the second opening, the common layer in the light-emitting functional layer extends from the first opening to the edge of the isolation structure along the first spacing portion 223 and the inner surface of the second opening, and the common layer between adjacent sub-pixels is cut off, that is, the crosstalk path between the sub-pixels is cut off, thereby effectively reducing the crosstalk between the sub-pixels and improving the display effect.

[0157] In summary, the embodiment of the present application provides a manufacturing method of a display panel, which includes a driving back plate, a pixel defining layer, a plurality of pixel structures, a plurality of isolation structures, and a plurality of support structures. The pixel defining layer has a first opening and a second opening, and the support structure is located on the side of the pixel defining layer away from the driving back plate. The support structure can include a support base and a support pad stacked in a direction away from the driving back plate, and the orthographic projection of the support pad on the driving back plate is located in the orthographic projection of the support base on the driving back plate. The stability of the support structure is ensured by the large-size support base, and the contact area between the support pad and the mask plate is reduced by the small-size support pad, thereby reducing the probability of the mask plate scratching the support pad, so that the yield of the display panel can be improved.

[0158] In addition, the support base and the support pad are stacked on the pixel defining layer, which can increase the distance between the end of the support structure on the back of the driving back plate and the driving back plate, that is, the height of the support structure is increased. When the support structure is used to support the mask plate, the distance between the mask plate and the light-emitting functional layer can be increased, so that the mask plate can avoid scratching the light-emitting functional layer, and the yield of the display panel can be further improved.

[0159] In addition, the display device can include a power supply assembly and a display module. The display module can be any of the display modules described above. The power supply assembly can be configured to supply power to the display module. The display device can further include a circuit protection plate, a middle frame, and a back cover. The circuit protection plate can be electrically connected to the power supply assembly. The power supply assembly can be a battery. The display panel in the display module can be a flexible display screen, such as a folding screen or a rolling screen.

[0160] Optionally, the display device can be an AMOLED display device, a liquid crystal display device, electronic paper, a mobile phone, a tablet computer, a television, a display, a notebook computer, a digital photo frame, a vehicle-mounted display, or any product or component having a display function.

[0161] It should be noted that in the drawings, the sizes of layers and regions can be exaggerated for clarity. It will also be understood that when a layer or element is referred to as being "on" another layer or element, it can be directly on the other layer or element or intervening layers can also be present. In addition, it will also be understood that when a layer or element is referred to as being "beneath" another layer or element, it can be directly beneath the other layer or element or one or more intervening layers or elements can also be present. In addition, it will also be understood that when a layer or element is referred to as being "between" two layers or elements, it can be the only layer or element between the two layers or elements or one or more intervening layers or elements can also be present. Like reference numerals refer to like elements throughout.

[0162] In the present application, the terms "first", "second", "third", "fourth" and "fifth" are used only for descriptive purposes and are not to be construed as indicating or implying relative importance. The term "a plurality of" refers to two or more, unless otherwise specifically specified.

[0163] The above description is only some optional embodiments of the present application, and is not used to limit the present application. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application should be included in the protection scope of the present application.

Claims

1. A display panel, characterized by, The display panel comprises: a driving backplate; a pixel defining layer on the driving backplate, the pixel defining layer comprising a plurality of first openings and a plurality of second openings; a plurality of pixel structures comprising a light emitting functional layer, the light emitting functional layer partially located in the first openings and partially extending into the second openings; a plurality of isolation structures between the light emitting functional layer and the driving backplate, at least part of edges of the isolation structures being located in the second openings, at least part of the light emitting functional layer located in the second openings being broken at edges of the isolation structures; a plurality of support structures on a side of the pixel defining layer away from the driving backplate, and a projection of the support structures on the driving backplate being located in a projection of the pixel defining layer on the driving backplate; the support structure comprising a support base and a support pad stacked in a direction away from the driving backplate, a projection of the support pad on the driving backplate being located in a projection of the support base on the driving backplate, and an area of the projection of the support base on the driving backplate being greater than an area of the projection of the support pad on the driving backplate.

2. The display panel of claim 1, wherein, the support pad comprising a plurality of support columns, and a projection of the plurality of support columns on the driving backplate being located in a projection of the corresponding support base on the driving backplate.

3. The display panel of claim 2, wherein, the projections of the plurality of support columns on the driving backplate being arranged around a first center, the first center being a center of the projection of the support base on the driving backplate.

4. The display panel of claim 2, wherein, the support base comprising a peripheral portion and a filling portion connected to each other, the filling portion being located between the plurality of support columns, and the peripheral portion surrounding the plurality of support columns; a height of the peripheral portion being less than a height of the filling portion.

5. The display panel of claim 2, wherein, the support column comprising a first top surface and a first bottom surface, and a first side surface connecting the first top surface and the first bottom surface, the first top surface being located on a side of the first bottom surface away from the driving backplate; a dimension of a projection of the first top surface on the driving backplate in a direction parallel to a plate surface of the substrate being less than 4 microns.

6. The display panel of claim 1, wherein, of the plurality of support structures, at least one of the support structures comprising a plurality of the support bases and a plurality of the support pads corresponding to the plurality of the support bases one by one; a projection of the support pad on the driving backplate being located in a projection of the corresponding support base on the driving backplate, and an area of the projection of the support base on the driving backplate being greater than an area of the projection of the corresponding support pad on the driving backplate.

7. The display panel of claim 6, wherein, a first center of the projection of the support base on the driving backplate and a second center of the projection of the support pad on the driving backplate coincide.

8. The display panel of claim 1, wherein, in a direction perpendicular to the driving backplate, a ratio of a height of the support base to a height of the support structure ranges from 20% to 70%.

9. The display panel of claim 1, wherein, The support base comprises a second top surface, a second bottom surface and a second side surface connecting the second top surface and the second bottom surface, the second top surface is located on the side of the second bottom surface away from the driving backplate; The first included angle between the second bottom surface and the second side surface ranges from 10° to 60°; The support pad comprises a third top surface, a third bottom surface and a third side surface connecting the third top surface and the third bottom surface, the third top surface is located on the side of the third bottom surface away from the driving backplate; The second included angle between the third bottom surface and the third side surface ranges from 10° to 60°.

10. The display panel of any of claims 1 to 9, wherein, The display panel further comprises a cushion layer part, the cushion layer part is located on the side of the pixel defining layer away from the support structure, and the orthographic projection of the support structure on the driving backplate is located in the orthographic projection of the cushion layer part on the driving backplate.

11. The display panel of claim 10, wherein, The isolation structure and the cushion layer part are the same layer structure formed by the same patterning process.

12. The display panel of claim 10, wherein, The orthographic projection of the cushion layer part on the driving backplate is located in the orthographic projection of the pixel defining layer on the driving backplate; and the shortest distance between at least part of the edge of the isolation structure and the edge of the pixel defining layer covering the cushion layer part is greater than or equal to 4 microns.

13. The display panel of any of claims 1 to 12, wherein, The pixel structure further comprises a first electrode and a second electrode located on both sides of the light-emitting functional layer in the direction perpendicular to the driving backplate, and the first electrode is located between the light-emitting functional layer and the driving backplate; The isolation structure is located between the first electrode and the driving backplate.

14. The display panel of claim 13, wherein, The orthographic projection of the support structure on the driving backplate does not overlap with the orthographic projection of the isolation structure on the driving backplate.

15. The display panel of claim 13, wherein, The second electrode and at least one layer of the plurality of film layers included in the light-emitting functional layer overlap with the orthographic projection of the isolation structure on the driving backplate.

16. The display panel of claim 13, wherein, The isolation structure comprises a first isolation part and a second isolation part connected, and the orthographic projection of the first isolation part on the driving backplate is located in the orthographic projection of the second opening on the driving backplate; The orthographic projection of the second isolation part on the driving backplate overlaps with the orthographic projection of the pixel defining layer on the driving backplate, and the orthographic projection of the first electrode on the driving backplate is located in the orthographic projection of the second isolation part on the driving backplate.

17. The display panel of claim 16, wherein, The support structure is located between two adjacent first isolation parts.

18. The display panel of any of claims 1 to 17, wherein, The orthographic projection of the second opening on the driving backplate is located between the orthographic projection of the first opening on the driving backplate and the orthographic projection of the support structure on the driving backplate.

19. A method for manufacturing a display panel, characterized by, The method comprises: forming a plurality of isolation structures on a driving backplate; forming a pixel defining layer on the driving backplate with the plurality of isolation structures, the pixel defining layer comprising a plurality of first openings and a plurality of second openings; forming a plurality of support structures on the side of the pixel defining layer away from the driving backplate, the support structures being located on the side of the pixel defining layer away from the driving backplate, and the orthographic projection of the support structures on the driving backplate being located in the orthographic projection of the pixel defining layer on the driving backplate; The support structure includes a support base and a support pad stacked in a direction away from the drive back plate. The orthographic projection of the support pad on the drive back plate is located in the orthographic projection of the support base on the drive back plate, and the area of ​​the orthographic projection of the support base on the drive back plate is larger than the area of ​​the orthographic projection of the support pad on the drive back plate. A light-emitting functional layer is formed on a drive backplate having the plurality of support structures, a portion of the light-emitting functional layer being located in the first opening and a portion of the light-emitting functional layer extending into the second opening, wherein the isolation structure is located between the light-emitting functional layer and the drive backplate, at least a portion of the edge of the isolation structure being located in the second opening, and at least a portion of the light-emitting functional layer located in the second opening being disconnected at the edge of the isolation structure.

20. A display device comprising: The display device includes a power supply circuit and a display panel as claimed in any one of claims 1 to 18, wherein the power supply circuit supplies power to the display panel.

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