Display substrate and display device

Abstract

The invention relates to a display substrate and a display device.The display substrate comprises a display area, a transition area and a hole opening area, the transition area is arranged around the hole opening area, and the display area is arranged around the transition area; the display substrate comprises a driving back plate, an organic film layer is arranged in the transition area and on the first side of the driving back plate, a hollow structure is arranged on the organic film layer, and the hollow structure is arranged around the opening area.

Description

Technical Field

[0001] The present invention relates to the technical field of display product manufacturing, and in particular to a display substrate and a display device. Background Art

[0002] In order to further increase the screen-to-body ratio, many display products use an AA Hole design, that is, a hole design is set in the active display area (AA area for short), so that sensors such as cameras can be placed under the hole in the AA area, in order to reduce the screen border and increase the screen-to-body ratio. In order to prevent water and oxygen from eroding the display area at the hole cutting site, isolation columns and isolation dams are set around the hole. However, in the process after the packaging process, the isolation columns and isolation dams will cause stress concentration due to the sudden change in height, resulting in cracks in the packaging film layer and GDSH (Growing Dark Spot; H: Hole refers to the GDS at the AA hole position) defects. Summary of the invention

[0003] In order to solve the above technical problems, the present invention provides a display substrate and a display device to solve the problem of defects in the packaging film layer caused by stress concentration.

[0004] In order to achieve the above object, the technical solution adopted in the embodiment of the present invention is: a display substrate,

[0005] The display substrate comprises a display area, a transition area and an opening area, wherein the transition area is arranged around the opening area, and the display area is arranged around the transition area;

[0006] The display substrate comprises a driving backplane, in the transition region, an organic film layer is arranged on a first side of the driving backplane, a hollow structure is arranged on the organic film layer, and the hollow structure is arranged around the opening region;

[0007] The hollow structure includes a plurality of through holes. Along the direction away from the driving back plate, the through holes include a first part and a second part that are connected. The area of ​​the orthographic projection of the first part on the driving back plate is larger than the area of ​​the orthographic projection of the second part on the driving back plate.

[0008] Optionally, in the display area, a flat layer is arranged on the first side of the driving backplane, and the flat layer and the organic film layer are arranged on the same layer, the distance between the side of the organic film layer away from the driving backplane and the driving backplane is a first distance, the distance between the side of the flat layer away from the driving backplane and the driving backplane is a second distance, and the difference between the first distance and the second distance is less than a preset value.

[0009] Optionally, in the display area, a pixel definition layer is set on the first side of the driving backplane, and the pixel definition layer is located on the side of the flat layer away from the driving backplane, the distance between the side of the organic film layer away from the driving backplane and the driving backplane is a first distance, the distance between the side of the pixel definition layer away from the driving backplane and the driving backplane is a third distance, and the difference between the first distance and the third distance is less than a preset value.

[0010] Optionally, the thickness of the organic film layer is 4.5-10 um.

[0011] Optionally, in a direction from the display area to the opening area, a size of the second portion is greater than 5 um.

[0012] Optionally, in a direction from the display area to the opening area, the hollow structure includes at least one circle of first hollow portions, and the first hollow portions include a plurality of independently arranged through holes.

[0013] Optionally, the first hollow portion includes a plurality of through holes arranged at intervals, and in the same first hollow portion, the area between two adjacent through holes is a connection area;

[0014] At least one circle of the first hollow portion includes a first sub-hollow portion and a second sub-hollow portion that are adjacently arranged, and an orthographic projection of the connection area in the first sub-hollow portion on the second sub-hollow portion is located in the corresponding through hole in the second sub-hollow portion;

[0015] In the direction from the display area to the opening area, the boundary of the first sub-hollow portion close to the second sub-hollow portion is a first boundary, and the boundary of the second sub-hollow portion close to the first sub-hollow portion is a second boundary, and the first boundary and the second boundary coincide.

[0016] Optionally, the first hollow portion includes a plurality of the through holes, and the plurality of the through holes in the same first hollow portion include a first sub-through hole and a second sub-through hole that are adjacently arranged, and a boundary of a side of the first sub-through hole close to the second sub-through hole coincides with a boundary of a side of the second sub-through hole close to the first sub-through hole;

[0017] In the direction from the display area to the opening area, at least one circle of the first hollow portion includes a first sub-hollow portion and a second sub-hollow portion that are adjacently arranged, and the boundary of the first sub-hollow portion on the side close to the second sub-hollow portion is a first boundary, and the boundary of the second sub-hollow portion on the side close to the first sub-hollow portion is a second boundary, and the first boundary and the second boundary coincide.

[0018] Optionally, in the direction from the display area to the opening area, the hollow structure includes a plurality of circles of first hollow portions, some of the first hollow portions include a plurality of interconnected through holes, and some of the first hollow portions include a plurality of independent through holes.

[0019] Optionally, in a direction from the display area to the opening area, the hollow structure includes a plurality of circles of first hollow portions, and the first hollow portions include a plurality of independent through holes;

[0020] In the direction from the display area to the opening area, the hollow structure also includes at least one circle of second hollow parts located on opposite sides of the multiple circles of the first hollow parts and at least one position in the middle of the multiple circles of the first hollow parts, the second hollow parts are arranged around the opening area, and the second hollow parts include an annular through hole arranged through the organic film layer.

[0021] Optionally, the annular through hole is formed by connecting a plurality of through holes.

[0022] An embodiment of the present invention further provides a display device, comprising the above-mentioned display substrate.

[0023] The beneficial effects of the present invention are as follows: the display substrate includes a display area, a transition area and an opening area, the transition area is arranged around the opening area, and the display area is arranged around the transition area. The organic film layer is arranged in the transition area to reduce the height difference between the transition area and the display area, thereby reducing the stress gap. The hollow structure is arranged on the organic film layer, and its function is the same as that of the isolation column and the isolation dam in the related art, that is, the display area and the opening area can be blocked, thereby preventing water vapor and oxygen from being transmitted to the display area along the EL layer. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 A schematic diagram showing a display substrate in the related art;

[0025] Figure 2 A schematic diagram showing a display substrate in the related art;

[0026] Figure 3 A schematic diagram showing a display substrate in an embodiment of the present invention;

[0027] Figure 4 A schematic diagram showing a display substrate in an embodiment of the present invention;

[0028] Figure 5 A schematic diagram showing a hollow structure in an embodiment of the present invention;

[0029] Figure 6 A schematic diagram showing a hollow structure in an embodiment of the present invention;

[0030] Figure 7 A schematic diagram showing a hollow structure in an embodiment of the present invention;

[0031] Figure 8 A schematic diagram showing a hollow structure in an embodiment of the present invention;

[0032] Fig. 9 express Figure 8 A three-dimensional schematic diagram of the hollow structure in FIG.

[0033] Fig.10 A schematic diagram showing a hollow structure in an embodiment of the present invention;

[0034] Fig.11 express Fig.10 A three-dimensional schematic diagram of a hollow structure;

[0035] Fig.12 A schematic diagram showing forming a packaging layer on a through hole;

[0036] Fig.13 A schematic diagram showing forming a packaging layer on a through hole;

[0037] Fig.14 A schematic diagram showing a display substrate in an embodiment of the present invention. DETAILED DESCRIPTION

[0038] In order to make the purpose, technical solution and advantages of the embodiments of the present disclosure clearer, the technical solution of the embodiments of the present disclosure will be clearly and completely described below in conjunction with the drawings of the embodiments of the present disclosure. Obviously, the described embodiments are part of the embodiments of the present disclosure, not all of the embodiments. Based on the described embodiments of the present disclosure, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present disclosure.

[0039] Unless otherwise defined, the technical terms or scientific terms used in the present disclosure should be understood by people with ordinary skills in the field to which the present disclosure belongs. The "first", "second" and similar words used in the present disclosure do not indicate any order, quantity or importance, but are only used to distinguish different components. Similarly, similar words such as "one", "one" or "the" do not indicate quantity restrictions, but indicate that there is at least one. Similar words such as "include" or "comprise" mean that the elements or objects appearing before the word cover the elements or objects listed after the word and their equivalents, without excluding other elements or objects. Similar words such as "connect" or "connected" are not limited to physical or mechanical connections, but can include electrical connections, whether direct or indirect. "Up", "down", "left", "right" and the like are only used to indicate relative positional relationships. When the absolute position of the described object changes, the relative positional relationship may also change accordingly.

[0040] The features such as "parallel", "perpendicular", and "same" used in the embodiments of the present disclosure include the features such as "parallel", "perpendicular", and "same" in a strict sense, as well as the cases where "approximately parallel", "approximately perpendicular", "approximately the same", etc. include certain tolerances, taking into account the tolerances associated with the measurement of specific quantities (e.g., the limitations of the measurement system), and represent the acceptable deviation range for a specific value determined by ordinary technicians in the field. For example, "approximately" can mean within one or more standard deviations, or within 3% or 5% of the value.

[0041] The structure of the display substrate in the related art is as follows Figure 1 and Figure 2 As shown. At present, the process widely used in the under-screen camera technology is to etch the position corresponding to the non-display area of ​​the under-screen camera area by gas etching in the driving backplane process (BP process) to form a through hole (Active AreaHole, referred to as AA hole). Subsequently, a normal vacuum evaporation coating process (Evaporation, referred to as EV process) and encapsulation process (Encapsulation, referred to as EN process) are carried out. Due to the existence of the through hole, the coating layer formed by the vacuum evaporation coating process is partially located in the through hole and is in direct contact with the substrate. By performing laser surface scanning in the laser lift-off process section (Laser Lift-Off, referred to as LLO process) in the post-cutting process (Even After Cutting, referred to as EAC process), the coating layer at the through hole can be removed, thereby ensuring that the transmittance of the non-display area can meet the camera requirements of the front camera.

[0042] In an OLED display panel with an AA-Hole structure, the display panel includes a driving backplane, which includes a base substrate 6, and an inorganic layer 7 and a driving circuit layer 8 ( Figure 2 Only the gate insulating layer GI1 and / or GI2, the interlayer insulating layer ILD and the passivation layer PVX are shown in the figure. The display panel includes an opening area 1, a transition area 2 arranged around the opening area 1, and a display area 3 arranged around the transition area 2. An isolation dam (Dam) 4 and an isolation pillar (Pillar) 5 are arranged in the transition area 2 to isolate the EL layer (light-emitting layer) between the display area 3 and the opening area 1 to prevent water vapor and oxygen from being transmitted along the EL layer to the display area 3, which may cause display failure of the display panel.

[0043] The opening area 1 has certain requirements for the transmittance of the panel, so the pixel circuit and PLN (flat layer) 101, PDL (pixel definition layer) 102, PS (support layer, used to support the mask plate forming the light-emitting layer) 103 and other film layers in this area will be removed, which will cause a huge difference in the overall stress of the opening area 1 and the panel. When the panel is packaged, a weak area with mismatched stress will be formed in the opening area 1. In the post-packaging process, such as EAC, Top Lami (refers to the bonding between the protective film on the light-emitting side of the panel and the packaging film layer), LLO, Bottom Lami (protective film is bonded on the backlight side of the display panel), the opening area 1 is pressed / pulled. At this time, the isolation column 5 and the isolation dam 4 in the opening area 1 will experience stress concentration due to the sudden change in height difference, resulting in cracks in the packaging film layer and GDSH failure.

[0044] refer to Figure 3-Figure 14 In view of the above problems, this embodiment provides a display substrate, which includes a display area 3, a transition area 2 and an opening area 1, wherein the transition area 2 is arranged around the opening area 1, and the display area 3 is arranged around the transition area 2;

[0045] The display substrate comprises a driving backplane. In the transition area 2 , an organic film layer 21 is disposed on a first side of the driving backplane. A hollow structure is disposed on the organic film layer 21 . The hollow structure is disposed around the opening area 1 .

[0046] By providing the organic film layer 21 in the transition area 2, the height difference between the transition area 2 and the display area 3 is reduced, thereby reducing the stress gap. The hollow structure is provided on the organic film layer 21, and its function is the same as that of the isolation column and the isolation dam in the related art, that is, it can block the display area 3 and the opening area 1, and prevent water vapor and oxygen from being transmitted to the display area 3 along the EL layer.

[0047] Exemplarily, the driving backplane includes a base substrate 6, and an inorganic layer 7 and a driving circuit layer 8 ( Figure 4 Only the gate insulating layer GI1 and / or GI2, the interlayer insulating layer ILD and the passivation layer PVX are shown in the figure). The substrate 6 may be a flexible substrate 6 made of polyimide or a glass substrate. The inorganic layer 7 includes a barrier layer (Barrier) and a buffer layer (Buffer) stacked in sequence in a direction away from the substrate 6. The driving circuit layer 8 includes a thin film transistor TFT, and the TFT may be a top gate TFT, a bottom gate TFT or a double gate TFT. The type of TFT is not limited in the embodiment of the present disclosure. For example, the thin film transistor includes an active layer arranged on the side of the buffer layer facing away from the substrate 6, a gate insulating layer (GI) arranged on the side of the active layer facing away from the substrate 6, a gate arranged on the side of the gate insulating layer facing away from the substrate 6, an interlayer dielectric layer (ILD) arranged on the side of the gate insulating layer facing away from the substrate 6, and a conductive layer arranged on the side of the interlayer dielectric layer facing away from the substrate 6, and the conductive layer includes a source and a drain of the thin film transistor, and the source and the drain are electrically connected to the active layer respectively.

[0048] Exemplarily, in the display area 3, a flat layer 31 is arranged on the side of the thin film transistor layer away from the base substrate 6, and a first electrode 32, a pixel definition layer 33, a light-emitting layer, a second electrode 10 and an encapsulation layer 9 are sequentially arranged on the side of the flat layer 31 away from the driving backplane. The encapsulation layer 9 includes a first inorganic encapsulation film layer 91, an organic encapsulation film layer 92 and a second inorganic encapsulation film layer 93 which are stacked in layers. The encapsulation layer 9 is formed by the staggered stacking of the first inorganic encapsulation film layer 91, the organic encapsulation film layer 92 and the second inorganic encapsulation film layer 93, which may be 3 layers or 5 layers. Among them, the material of the first inorganic encapsulation film layer 91 and the second inorganic encapsulation film layer 93 is SiOx, SiNx or a combination of other inorganic materials, and can be formed by chemical vapor deposition, physical vapor deposition, atomic force deposition and the like. The organic encapsulation film layer 92 can be formed by uniformly coating a molten material (hereinafter referred to as Ink) that can block water vapor between the first inorganic encapsulation film layer 91 and the second inorganic encapsulation film layer 93 using inkjet printing (IJP, InjectPrinter) technology, which can flatten the surface of the display panel and increase the bendability of the display panel. The hollow structure can block the diffusion of Ink to the opening area 1, avoid the formation of a water-oxygen passage, and thus effectively prevent water-oxygen invasion.

[0049] In an exemplary embodiment, in the display area 3, a flat layer 31 is arranged on the first side of the driving backplane, and the flat layer 31 and the organic film layer 21 are arranged on the same layer. The distance between the side of the organic film layer 21 away from the driving backplane and the driving backplane is a first distance, and the distance between the side of the flat layer 31 away from the driving backplane and the driving backplane is a second distance. The difference between the first distance and the second distance is less than a preset value.

[0050] The preset value can be set according to actual needs, for example, the preset value can be 0.1-0.15um, so that the first distance and the second distance are close to each other, reducing the height difference between the transition area 2 and the display area 3. In some embodiments, the first distance and the second distance are the same, so as to effectively reduce the height difference between the display area 3 and the transition area 2, reduce the stress gap, and avoid defects such as cracks in the packaging film layer due to stress concentration.

[0051] The organic film layer 21 can be made of the same material as the planar layer 31 . The organic film layer 21 can be made with the planar layer 31 through a synchronous process to save steps, but the present invention is not limited thereto. The organic film layer 21 can also be made through a separate process.

[0052] In an exemplary embodiment, in the display area 3, a pixel definition layer 33 is provided on the first side of the driving backplane, and the pixel definition layer is located on the side of the planar layer away from the driving backplane, the distance between the side of the organic film layer away from the driving backplane and the driving backplane is a first distance, the distance between the side of the pixel definition layer 33 away from the driving backplane and the driving backplane is a third distance, and the difference between the first distance and the third distance is less than a preset value.

[0053] The preset value can be set according to actual needs, for example, the preset value can be 0.1-0.15um, so that the first distance and the third distance are close to each other, reducing the height difference between the transition area 2 and the display area 3. In some embodiments, the first distance and the third distance are the same, so as to effectively reduce the height difference between the display area 3 and the transition area 2, reduce the stress gap, and avoid defects such as cracks in the packaging film layer due to stress concentration.

[0054] It should be noted that the organic film layer 21 can be made of the same material as the pixel definition layer 33. The organic film layer 21 can be made through a synchronous process with the pixel definition layer 33 to save steps, but this is not limited to this. The organic film layer 21 can also be made through a separate process.

[0055] In an exemplary embodiment, the thickness of the organic film layer 21 is 4.5-10 um, but not limited thereto.

[0056] Figure 4 FIG. 2 shows a schematic diagram in which a surface of the organic film layer 21 away from the base substrate 6 is almost flush with a surface of the pixel definition layer 33 away from the base substrate 6 , but the present invention is not limited thereto.

[0057] In this embodiment, the hollow structure is arranged on the organic film layer 21, which blocks the display area 3 and the opening area 1 to avoid water and oxygen invasion, and at the same time can reduce the height difference between the display area 3 and the transition area 2, reduce stress, and solve the defects such as cracks generated in the isolation dam structure of the encapsulation layer 9 due to stress concentration in the related technology; and when unavoidable cracks appear in the transition area 2, the cracks can be prevented from spreading to the display area 3, thereby improving the reliability of packaging.

[0058] refer to Figure 4 and Figure 5 (It should be noted that Figure 5 It is a schematic diagram, in order to more clearly show the hollow structure, Figure 5 Only the base substrate 6, the organic film layer 21 thereon, and the hollow structure arranged on the organic film layer 21 are schematically shown, and the film layer between the base substrate 6 and the organic film layer 21 is simplified and not marked). In an exemplary embodiment, the hollow structure includes a plurality of through holes 211. Along the direction away from the driving backplane, the through holes 211 include a first part 2001 and a second part 2002 that are connected. The area of ​​the orthographic projection of the first part 2001 on the base substrate 6 is larger than the area of ​​the orthographic projection of the second part 2002 on the base substrate 6.

[0059] The through hole 211 is formed by wet etching process, and the through hole 211 includes the first part 2001 and the second part 2002 by over-etching. In the direction perpendicular to the driving backplane, the through hole 211 is in a convex shape. In the display area 3, away from the driving backplane, a flat layer 31, a first electrode 32, a pixel definition layer 33, a light-emitting layer and a second electrode 10 are sequentially formed. The first electrode 32 is an anode, and the second electrode 10 is a cathode. The cathode extends to the transition area 2, that is, the cathode is formed on the whole surface. The through hole 211 includes the first part 2001 and the second part 2002 connected to each other, which can play a partitioning role when the cathode material is evaporated. Fig.12 and Fig.13 As shown, Fig.12The area marked with a middle dotted line is a through hole 211. At the through hole 211, the bottom of the through hole 211 will be covered by the cathode material. Due to the obstruction of the second part 2002, the cathode material is not evaporated on the side wall of the first part 2001, and a small amount of cathode material will be evaporated on the side wall of the second part 2002 (not shown in the figure). In this way, the cathode is isolated at the through hole 211, effectively preventing water and oxygen invasion.

[0060] The display substrate also includes an encapsulation layer 9 arranged on the driving backplane, and the encapsulation layer 9 is formed on the side of the cathode layer away from the driving backplane. The encapsulation layer 9 is composed of a first inorganic encapsulation film layer 91, an organic encapsulation film layer 92 covering the first inorganic encapsulation film layer 91, and a second inorganic encapsulation film layer 93 located on the organic encapsulation film 92. The encapsulation layer 9 is stacked on the cathode layer (i.e., the second electrode 10) to encapsulate the display panel to prevent the display panel from being corroded by moisture and oxygen, wherein the encapsulation layer 9 is formed on the entire surface, that is, the encapsulation layer 9 covers the display area 3, the transition area 2 and the opening area 1, and the first inorganic encapsulation film layer 91 is stacked on the cathode layer. According to the step coverage performance of the inorganic encapsulation film layer (SiONx or SiNx) (5*5um step Side / Top film layer is about 40%, when the inorganic encapsulation film layer is deposited on a groove, the inner side surface and the bottom of the groove form a step structure, the height of the inner side surface of the groove is 5um, the width of the bottom of the groove is 5um, and the film thickness of the inner side surface of the groove is 40% of the film thickness of the top of the groove), in some embodiments, in the direction from the display area 3 to the opening area 1, the size a of the second part 2002 is greater than 5um to ensure the encapsulation performance.

[0061] Exemplarily, in a direction perpendicular to the driving backplane, the through hole 211 is disposed through the organic film layer 21 to effectively block the invasion of water and oxygen.

[0062] Exemplarily, the first inorganic encapsulation film layer 91 is formed by chemical vapor deposition and can cover the through hole 211. In some embodiments, the encapsulation layer 9 only includes the first inorganic encapsulation film layer 91 and the second inorganic encapsulation film layer 93 stacked together. Fig.13In some embodiments, the encapsulation layer 9 includes the first inorganic encapsulation film layer 91, the organic encapsulation film layer 92, and the second inorganic encapsulation film layer 93 stacked, the organic encapsulation film layer 92 is filled in the through hole 211, and the thickness of the organic encapsulation film layer 92 is equal to the thickness of the organic film layer 21 (i.e., the depth of the through hole 211), so that the side of the organic encapsulation film layer 92 away from the driving backplane is flush with the side of the organic encapsulation film layer 92 away from the driving backplane, or the thickness of the organic encapsulation film layer 92 is greater than the thickness of the organic film layer 21, and the side of the organic encapsulation film layer 92 away from the driving backplane is a plane, thereby improving the flatness of the transition zone 2. Fig.12 The thickness of the organic encapsulation film layer 92 is greater than the thickness of the organic film layer 21 .

[0063] refer to Figure 4-Figure 11 In an exemplary embodiment, in the direction from the display area 3 to the opening area 1, the hollow structure includes at least one circle of first hollow portions 200, and the first hollow portions 200 include a plurality of independently arranged through holes 211.

[0064] Exemplarily, in the direction from the display area 3 to the opening area 1, the hollow structure includes multiple circles of the first hollow portions 200, which are in a grid shape and are arranged around the opening area 1, effectively separating the display area 3 and the opening area 1.

[0065] refer to Figure 6 In an exemplary embodiment, the first hollow portion 200 includes a plurality of through holes 211 arranged at intervals, and in the same first hollow portion 200, the area between two adjacent through holes 211 is a connection area 212;

[0066] At least one circle of the first hollow portion 200 includes a first sub-hollow portion 201 and a second sub-hollow portion 202 that are adjacently arranged, and the orthographic projection of the connection area 212 in the first sub-hollow portion 201 on the second sub-hollow portion 202 is located in the corresponding through hole 211 in the second sub-hollow portion 202;

[0067] In the direction from the display area 3 to the opening area 1, the boundary of the first sub-hollow portion 201 close to the second sub-hollow portion 202 is a first boundary 2011, and the boundary of the second sub-hollow portion 202 close to the first sub-hollow portion 201 is a second boundary, and the first boundary 2011 and the second boundary coincide.

[0068] In the above scheme, the through holes 211 of the first sub-hollow portion 201 and the through holes 211 in the second sub-hollow portion 202 are arranged alternately, and the orthographic projection of the connecting area 212 in the first sub-hollow portion 201 on the second sub-hollow portion 202 is located in the corresponding through hole 211 in the second sub-hollow portion 202, that is, in the extension direction of the first hollow portion 200, the length of the orthographic projection of the connecting area 212 in the first sub-hollow portion 201 on the second sub-hollow portion 202 can be less than or equal to the length of the orthographic projection of the connecting area 212 in the first sub-hollow portion 201 on the second sub-hollow portion 202. That is, in the direction from the display area 3 to the opening area 1, the through hole 211 in the first sub-hollow portion 201 partially overlaps with the through hole 211 in the second sub-hollow portion 202, or the boundary of the through hole 211 in the first sub-hollow portion 201 overlaps with the corresponding boundary of the corresponding through hole 211 in the second sub-hollow portion 202 (the length of the orthographic projection of the connection area in the first sub-hollow portion 201 on the second sub-hollow portion 202 is equal to the length of the corresponding through hole 211 in the second sub-hollow portion 202).

[0069] In an exemplary embodiment, the first hollow portion 200 includes a plurality of through holes 211, and the plurality of through holes 211 in the same first hollow portion 200 include adjacently arranged first sub-through holes and second sub-through holes, and a boundary of a side of the first sub-through hole close to the second sub-through hole coincides with a boundary of a side of the second sub-through hole close to the first sub-through hole (refer to Figure 8 and Fig. 9 The third boundary shown in 2012);

[0070] In the direction from the display area 3 to the opening area 1, the boundary of the first sub-hollow portion 201 close to the second sub-hollow portion 202 is a first boundary 2011, and the boundary of the second sub-hollow portion 202 close to the first sub-hollow portion 201 is a second boundary, and the first boundary 2011 and the second boundary coincide.

[0071] By adopting the above solution, the orthographic projection of the through hole 211 of the first sub-hollow portion 201 on the second sub-hollow portion 202 coincides with the corresponding through hole 211 in the second sub-hollow portion 202. Two adjacent through holes 211 in the same first hollow portion 200 are arranged adjacent to each other (the boundary between the two adjacent through holes 211 is shared), and the through hole 211 in the first sub-hollow portion 201 is adjacent to the corresponding through hole 211 in the second sub-hollow portion 202, that is, the boundary between the through hole 211 in the first sub-hollow portion 201 and the corresponding through hole 211 in the second sub-hollow portion 202 is shared.

[0072] It should be noted that the hollow structure includes multiple circles of the first hollow parts 200, and the first hollow parts 200 include multiple through holes 211, so that the multiple circles of the first hollow parts 200 are in a grid shape, and in the direction from the display area 3 to the opening area 1, the shape of the through holes 211 can be rectangular, diamond, etc.

[0073] It should be noted that when the boundary between two adjacent through holes 211 is at least partially shared (including two adjacent through holes 211 in the same first hollow portion 200, and the through hole 211 of the first sub-hollow portion 201 and the corresponding through hole 211 in the second sub-hollow portion 202), the width of the boundary of the through hole 211 is generally narrow (for example, 3-5um), which will not affect the effect of the hollow structure in preventing water and oxygen invasion. And after being encapsulated and covered by the encapsulation layer 9, water and oxygen invasion at the corresponding boundary of the through hole 211 can be effectively avoided.

[0074] In an exemplary embodiment, in the direction from the display area 3 to the opening area 1, the hollow structure includes a plurality of circles of first hollow portions 200, part of the first hollow portions 200 includes a plurality of interconnected through holes 211, and part of the first hollow portions 200 includes a plurality of independent through holes 211, Fig.10 .

[0075] By connecting the plurality of through holes 211 in part of the first hollow portion 200, the plurality of connected through holes 211 form a continuous annular through hole, i.e., an annular clearance area, in the extension direction of the first hollow portion 200, which effectively separates the display area 3 from the opening area 1 and effectively prevents water and oxygen invasion.

[0076] It should be noted that the first hollow portion 200 having a plurality of interconnected through holes 211 is defined as a third sub-hollow portion 203, and the first hollow portion 200 having a plurality of independently arranged through holes 211 is defined as a third sub-hollow portion 203. Then, due to the arrangement of the third sub-hollow portion 203, the arrangement of the through holes 211 in the fourth sub-hollow portion 204 is more flexible. The plurality of through holes 211 in the fourth sub-hollow portion 204 may be partially interconnected and partially independent, or all of the through holes 211 may be independently arranged and not interconnected. The plurality of independent through holes 211 in the fourth sub-hollow portion 204 may be at least partially arranged at intervals, or at least partially arranged adjacent to each other.

[0077] It should be noted that the number and position distribution of the third sub-hollow portions 203 and the number and position distribution of the fourth sub-hollow portions 204 are not limited.

[0078] In an exemplary embodiment, in the direction from the display area 3 to the opening area 1, the hollow structure includes a plurality of circles of first hollow portions 200, and the first hollow portions 200 include a plurality of independent through holes 211;

[0079] In the direction from the display area 3 to the opening area 1, the hollow structure further includes at least one circle of second hollow parts 300 located at opposite sides of the multiple circles of the first hollow parts 200 and at least one position in the middle of the multiple circles of the first hollow parts 200, the second hollow parts 300 are arranged around the opening area 1, and the second hollow parts 300 include an annular through hole arranged through the organic film layer 21, with reference to Figure 4 and Fig.14 , Figure 4 Only the second hollow portion 300 is schematically shown to be arranged between the display area 3 and the transition area 2 (i.e., one side of the first hollow portion 200 with multiple circles in the direction from the display area 3 to the opening area 1). Fig.14 FIG. 2 schematically shows that the second hollow portions 300 are disposed on opposite sides of the first hollow portions 200 of multiple circles and at a position in the middle of the first hollow portions 200 of multiple circles.

[0080] The first hollow portion 200 and the second hollow portion 300 cooperate to effectively ensure the water and oxygen blocking effect. Moreover, the arrangement of the second hollow portion 300 can make the arrangement of the plurality of through holes 211 in the first hollow portion 200 more flexible.

[0081] It should be noted that the annular through hole can be independently set, or the first hollow portion 200 having a plurality of interconnected through holes 211 can be reused as the second hollow portion 300, as long as the annular through hole is a complete, through-hole annular structure in the extension direction of the second hollow portion 300 (i.e., the circumferential direction of the opening area 1), and in the direction perpendicular to the driving backplane, the annular through hole is set to pass through the organic film layer 21.

[0082] Exemplarily, the manufacturing method of the display substrate in this embodiment is as follows:

[0083] A substrate 6 is provided, wherein the substrate 6 comprises a display area 3, a transition area 2 and an opening area 1, wherein the transition area 2 is arranged around the opening area 1, and the display area 3 is arranged around the transition area 2;

[0084] An inorganic layer 7 and a driving circuit layer 8 are sequentially formed on the base substrate 6, wherein the inorganic layer 7 includes a stacked barrier layer and a buffer layer, and the driving circuit layer 8 includes a thin film transistor layer;

[0085] In the display area 3, on the side of the thin film transistor layer away from the blocking layer, a planarization layer 31, a first electrode 32, a pixel definition layer 33 and a light emitting layer are sequentially formed;

[0086] In the transition region 2, an organic film layer 21 is formed on a side away from the thin film transistor layer;

[0087] Forming the hollow structure on the organic film layer 21 through a wet etching process;

[0088] forming a second electrode 10, wherein the second electrode 10 covers the display area 3 and the transition area 2;

[0089] An encapsulation layer 9 is formed, and the encapsulation layer 9 covers the display area 3 and the transition area 2 .

[0090] It should be noted that the organic film layer 21 may be disposed on the same layer as the planar layer 31 , or may be disposed on the same layer as the pixel definition layer 33 .

[0091] An embodiment of the present invention further provides a display device, comprising the above-mentioned display substrate.

[0092] There are a few points to note:

[0093] (1) The drawings of the embodiments of the present disclosure only relate to the structures related to the embodiments of the present disclosure, and other structures may refer to the general design.

[0094] (2) For the sake of clarity, in the drawings used to describe the embodiments of the present disclosure, the thickness of layers or regions is exaggerated or reduced, that is, these drawings are not drawn according to the actual scale. It is understood that when an element such as a layer, film, region or substrate is referred to as being "on" or "under" another element, the element may be "directly" "on" or "under" the other element or there may be intermediate elements.

[0095] (3) In the absence of conflict, the embodiments of the present disclosure and the features therein may be combined with each other to obtain new embodiments.

[0096] It is to be understood that the above embodiments are merely exemplary embodiments used to illustrate the principles of the present invention, but the present invention is not limited thereto. For those of ordinary skill in the art, various modifications and improvements can be made without departing from the spirit and essence of the present invention, and these modifications and improvements are also considered to be within the scope of protection of the present invention.

Claims

1. A display substrate, comprising a display area, a transition area and an opening area, wherein the transition area is arranged around the opening area, and the display area is arranged around the transition area; characterized in that: The display substrate comprises a driving backplane, in the transition region, an organic film layer is arranged on the first side of the driving backplane, a hollow structure is arranged on the organic film layer, and the hollow structure is arranged around the opening region; The hollow structure includes a plurality of through holes. Along the direction away from the driving back plate, the through holes include a first part and a second part that are connected. The area of ​​the orthographic projection of the first part on the driving back plate is larger than the area of ​​the orthographic projection of the second part on the driving back plate.

2. The display substrate according to claim 1, characterized in that: In the display area, a flat layer is arranged on the first side of the driving backplane, and the flat layer and the organic film layer are arranged on the same layer. The distance between the side of the organic film layer away from the driving backplane and the driving backplane is a first distance, and the distance between the side of the flat layer away from the driving backplane and the driving backplane is a second distance. The difference between the first distance and the second distance is less than a preset value.

3. The display substrate according to claim 2, characterized in that: In the display area, a pixel definition layer is arranged on the first side of the driving backplane, and the pixel definition layer is located on the side of the flat layer away from the driving backplane, the distance between the side of the organic film layer away from the driving backplane and the driving backplane is a first distance, the distance between the side of the pixel definition layer away from the driving backplane and the driving backplane is a third distance, and the difference between the first distance and the third distance is less than a preset value.

4. The display substrate according to claim 1, characterized in that: The thickness of the organic film layer is 4.5-10 um.

5. The display substrate according to claim 1, characterized in that: In a direction from the display area to the opening area, a size of the second portion is greater than 5 um.

6. The display substrate according to claim 1, characterized in that: In a direction from the display area to the opening area, the hollow structure includes at least one circle of first hollow parts, and the first hollow part includes a plurality of independently arranged through holes.

7. The display substrate according to claim 6, characterized in that: The first hollow portion includes a plurality of through holes arranged at intervals, and in the same first hollow portion, the area between two adjacent through holes is a connection area; At least one circle of the first hollow portion includes a first sub-hollow portion and a second sub-hollow portion that are adjacently arranged, and an orthographic projection of the connection area in the first sub-hollow portion on the second sub-hollow portion is located in the corresponding through hole in the second sub-hollow portion; In the direction from the display area to the opening area, the boundary of the first sub-hollow portion close to the second sub-hollow portion is a first boundary, and the boundary of the second sub-hollow portion close to the first sub-hollow portion is a second boundary, and the first boundary and the second boundary coincide.

8. The display substrate according to claim 6, characterized in that: The first hollow portion includes a plurality of the through holes, and the plurality of the through holes in the same first hollow portion include a first sub-through hole and a second sub-through hole that are adjacently arranged, and a boundary of a side of the first sub-through hole close to the second sub-through hole coincides with a boundary of a side of the second sub-through hole close to the first sub-through hole; In the direction from the display area to the opening area, at least one circle of the first hollow portion includes a first sub-hollow portion and a second sub-hollow portion that are adjacently arranged, and the boundary of the first sub-hollow portion on the side close to the second sub-hollow portion is a first boundary, and the boundary of the second sub-hollow portion on the side close to the first sub-hollow portion is a second boundary, and the first boundary and the second boundary coincide.

9. The display substrate according to claim 1, characterized in that: In the direction from the display area to the opening area, the hollow structure includes a plurality of circles of first hollow parts, some of the first hollow parts include a plurality of interconnected through holes, and some of the first hollow parts include a plurality of independent through holes.

10. The display substrate according to claim 1, characterized in that: In a direction from the display area to the opening area, the hollow structure includes a plurality of circles of first hollow parts, and the first hollow parts include a plurality of independent through holes; In the direction from the display area to the opening area, the hollow structure also includes at least one circle of second hollow parts located on opposite sides of the multiple circles of the first hollow parts and at least one position in the middle of the multiple circles of the first hollow parts, the second hollow parts are arranged around the opening area, and the second hollow parts include an annular through hole arranged through the organic film layer.

11. The display substrate according to claim 10, characterized in that: The annular through hole is formed by connecting a plurality of the through holes.

12. A display device, characterized in that: A display substrate comprising any one of claims 1 to 11.

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