Display substrate and display device

Abstract

The invention provides a display substrate which comprises a display area and a peripheral area located on the periphery of the display area. The driving circuit layer is positioned on the substrate; the light-emitting device layer is located on the side, away from the substrate, of the driving circuit layer, the light-emitting device layer comprises a plurality of light-emitting devices, and the light-emitting devices are arranged at intervals in the first direction and the second direction; the isolation column layer is located on the side, away from the substrate, of the driving circuit layer, the isolation column layer comprises a plurality of first isolation columns, the first isolation columns are located in the display area, and the display substrate comprises a bendable area. The isolation column layer further comprises at least one second isolation column located in the peripheral area and the bendable area, the side, away from the substrate, of the second isolation column comprises a sunken part, and the sunken part is at least partially sunken into the second isolation column in the direction close to the substrate.

Description

Technical Field

[0001] The present disclosure relates to the field of display technology, and in particular to a display substrate and a display device. Background Art

[0002] Flexible display products can be bent 360 degrees or even twisted because they use flexible materials. Compared with traditional rigid display products, flexible polyimide (PI) substrate and flexible ultra-thin glass (UTG) replace the rigid glass substrate and surface glass cover respectively, so that the AMOLED screen can bend under pressure. Flexible display products have extremely high flexibility and can be bent, folded and even curled, bringing a new user experience. How to improve the bending ability of flexible display products and avoid defects during the bending process is one of the topics that display product developers are concerned about.

[0003] The above information disclosed in this section is only for understanding the background of the inventive concept of the present disclosure and therefore the above information may contain information that does not constitute the prior art. Summary of the invention

[0004] In one aspect, a display substrate is provided, the display substrate comprising a display area and a peripheral area located around the display area, the display substrate comprising:

[0005] substrate substrate;

[0006] A driving circuit layer, located on the substrate;

[0007] a light emitting device layer, located on a side of the driving circuit layer away from the base substrate, the light emitting device layer comprising a plurality of light emitting devices, the plurality of light emitting devices being arranged at intervals along a first direction and a second direction; and

[0008] an isolation column layer, located on a side of the driving circuit layer away from the base substrate, the isolation column layer comprising a plurality of first isolation columns, the plurality of first isolation columns being located in the display area,

[0009] Among them, the display substrate includes a bendable area, the isolation column layer also includes at least one second isolation column located in the peripheral area, and the second isolation column is located in the bendable area, and the side of the second isolation column away from the base substrate includes a recessed portion, and the recessed portion is at least partially recessed in the second isolation column in a direction close to the base substrate.

[0010] According to some exemplary embodiments, the base substrate includes a first surface facing the driving circuit layer, and the recess penetrates the second isolation column along a direction perpendicular to the first surface.

[0011] According to some exemplary embodiments, an edge shape of an orthographic projection of the second spacer pillar on the base substrate includes an ellipse.

[0012] According to some exemplary embodiments, the second isolation column includes two recessed portions, and the two recessed portions are arranged at intervals along the major axis direction of the ellipse.

[0013] According to some exemplary embodiments, the portion of the display substrate located in the bendable region is configured to be bendable along a folding axis, and the folding axis is substantially parallel to the second direction; and / or the portion of the display substrate located in the bendable region is configured to be curled along a rolling axis, and the rolling axis is substantially parallel to the second direction; and

[0014] The major axis of the ellipse is substantially parallel to the second direction.

[0015] According to some exemplary embodiments, the bendable region includes a foldable region, and at least one of the second isolation columns is located in the foldable region; and / or,

[0016] The bendable region includes a rollable region, and at least one of the second isolation columns is located in the rollable region.

[0017] According to some exemplary embodiments, the display substrate further comprises a covering portion located on a side of the second isolation column away from the base substrate, an orthographic projection of the covering portion on the base substrate at least partially overlaps an orthographic projection of the second isolation column on the base substrate, and a surface roughness of the covering portion is greater than a surface roughness of the second isolation column; and

[0018] The light emitting device layer includes a first electrode layer located on the base substrate, a light emitting functional layer located on a side of the first electrode layer away from the base substrate, and a second electrode layer located on a side of the light emitting functional layer away from the base substrate, wherein the light emitting functional layer contacts the covering portion.

[0019] According to some exemplary embodiments, the material of the covering portion includes molybdenum.

[0020] According to some exemplary embodiments, the covering portion covers the recessed portion of the second spacer.

[0021] According to some exemplary embodiments, an orthographic projection of the covering portion on the base substrate is located inside an edge of an orthographic projection of the second spacer pillar on the base substrate.

[0022] According to some exemplary embodiments, the shape of the orthographic projection of the first isolation column on the substrate includes a circle; and / or,

[0023] The size of the second isolation column along the first direction is greater than the size of the first isolation column along the first direction; and / or,

[0024] A size of the second isolation column along the second direction is greater than a size of the first isolation column along the second direction.

[0025] In another aspect, a display device is provided, comprising the display substrate as described in any one of the above items. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Other objects and advantages of the present disclosure will be apparent from the following description of the present disclosure with reference to the accompanying drawings, and will help to have a comprehensive understanding of the present disclosure.

[0027] Figure 1 A schematic plan view of a display substrate according to an embodiment of the present disclosure is schematically shown.

[0028] Figure 2 Schematically shows Figure 1 An enlarged view of area A in the middle.

[0029] Figure 3 The cross-sectional view of a display substrate according to an embodiment of the present disclosure is schematically shown, wherein: Figure 3 Schematically shows the Figure 2 Cross-section taken along the midline BB'.

[0030] Figure 4 A schematic plan view of a display substrate according to an embodiment of the present disclosure is schematically shown.

[0031] Figure 5 Schematically shows Figure 1 Another magnified view of area A in the middle.

[0032] Figure 6 The cross-sectional view of a display substrate according to an embodiment of the present disclosure is schematically shown, wherein: Figure 6 Schematically shows the Figure 5 Cross-section taken along center line CC'.

[0033] Figure 7 The surface microscopic morphology of the covering portion of the display substrate according to the embodiment of the present disclosure is schematically shown.

[0034] Figure 8 A cross-sectional view of a display module according to an embodiment of the present disclosure is schematically shown.

[0035] It should be noted that, for the sake of clarity, in the drawings used to describe the embodiments of the present disclosure, the sizes of layers, structures or regions may be enlarged or reduced, that is, these drawings are not drawn according to the actual scale. DETAILED DESCRIPTION

[0036] In the following description, for the purpose of explanation, many specific details are set forth to provide a comprehensive understanding of various exemplary embodiments. However, it is apparent that various exemplary embodiments may be implemented without these specific details or with one or more equivalent arrangements. In other cases, well-known structures and devices are shown in block diagram form to avoid making various exemplary embodiments unnecessarily obscure. In addition, various exemplary embodiments may be different, but not necessarily exclusive. For example, the specific shape, configuration, and characteristics of an exemplary embodiment may be used or implemented in another exemplary embodiment without departing from the inventive concept.

[0037] In the accompanying drawings, the size and relative size of the elements may be exaggerated for the purpose of clarity and / or description. Thus, the size and relative size of the individual elements are not necessarily limited to the size and relative size shown in the drawings. When the exemplary embodiments may be implemented differently, the specific process sequence may be performed differently from the described sequence. For example, two processes described in succession may be performed substantially simultaneously or in an order opposite to the described sequence. In addition, the same reference numerals represent the same elements.

[0038] When an element is described as "on" another element, "connected to" another element or "coupled to" another element, the element may be directly on another element, directly connected to another element or directly coupled to another element, or there may be an intermediate element. However, when an element is described as "directly on" another element, "directly connected to" another element or "directly coupled to" another element, there is no intermediate element. Other terms and / or expressions used to describe the relationship between elements should be interpreted in a similar manner, for example, "between..." versus "directly between...", "adjacent" versus "directly adjacent" or "on..." versus "directly on...", etc. In addition, the term "connection" may refer to physical connection, electrical connection, communication connection and / or fluid connection. In addition, the X-axis, Y-axis and Z-axis are not limited to the three axes of the rectangular coordinate system, and can be interpreted in a broader sense. For example, the X-axis, Y-axis and Z-axis may be perpendicular to each other, or may represent different directions that are not perpendicular to each other. For the purpose of this disclosure, "at least one of X, Y, and Z" and "at least one selected from the group consisting of X, Y, and Z" may be interpreted as only X, only Y, only Z, or any combination of two or more of X, Y, and Z such as XYZ, XY, YZ, and XZ. As used herein, the term "and / or" includes any and all combinations of one or more of the listed associated items.

[0039] It should be understood that, although the terms first, second, etc. may be used herein to describe different elements, these elements should not be limited by these terms. These terms are only used to distinguish one element from another element. For example, without departing from the scope of the exemplary embodiment, a first element may be named a second element, and similarly, a second element may be named a first element.

[0040] During the frequent bending process, flexible display products are subject to compressive stress and tensile stress, which may cause display anomalies in the bending area. In order to ensure the excellent bending performance of flexible display products, at present, the stacked film layers in the display panel can be reasonably designed, such as adjusting the thickness of certain film layers and adjusting the position of the neutral layer to a position with less stress to avoid stress concentration on the functional film layer. In addition, the materials of the remaining functional film layers, including the protective cover, polarizer, backplane layer, etc., can also be changed to improve the bending performance of the neutral layer.

[0041] Currently, the risk of display abnormalities in flexible display products can be reduced to a certain extent through laminated structure design and film material selection. However, due to the influence of stress, the occurrence of defects cannot be completely avoided.

[0042] The inventors have found that, for flexible display products, the edges of the folded portion of the product are particularly prone to cracks due to bending stress, which in turn may cause related display defects, such as abnormal bright lines in the bending area.

[0043] Figure 1 A schematic plan view of a display substrate according to an embodiment of the present disclosure is schematically shown. Figure 2 Schematically shows Figure 1 An enlarged view of area A in the middle. Figure 3 The cross-sectional view of a display substrate according to an embodiment of the present disclosure is schematically shown, wherein: Figure 3 Schematically shows the Figure 2 Cross-section taken along the midline BB'.

[0044] Combined with reference Figure 1 , Figure 2 and Figure 3 The display substrate includes a display area AA and a peripheral area NA located around the display area AA. The display substrate includes a bendable area SX, and the portion of the display substrate located in the bendable area SX can be bent to achieve a change in display form.

[0045] The display substrate includes a base substrate 100 , a driving circuit layer 200 located on the base substrate 100 , a light emitting device layer 300 located on a side of the driving circuit layer 200 away from the base substrate 100 , and an isolation column layer 400 .

[0046] The driving circuit layer 200 includes a plurality of pixel driving circuits located in the display area AA, a gate driving circuit located in the peripheral area NA, and signal lines for driving the display. The driving circuit layer 200 may be formed by alternately stacking multiple conductive layers and multiple insulating layers.

[0047] The light-emitting device layer 300 includes a first electrode layer 310 located on the driving circuit layer 200, a light-emitting functional layer 320 located on the side of the first electrode layer 310 away from the substrate 100, and a second electrode layer 330 located on the side of the light-emitting functional layer 320 away from the substrate 100. The first electrode layer 310 may include a plurality of first electrodes 311 located in the display area AA, the plurality of first electrodes 311 are arranged at intervals along the first direction X and the second direction Y, and the plurality of first electrodes 311 are respectively electrically connected to a plurality of pixel driving circuits. A pixel defining layer PDL is also arranged between the first electrode layer 310 and the light-emitting functional layer 320, the pixel defining layer PDL includes a plurality of openings KK located in the display area AA, the plurality of openings KK are arranged at intervals along the first direction X and the second direction Y, the plurality of openings KK respectively expose a portion of the plurality of first electrodes 311, and the light-emitting functional layer 320 is respectively in contact with the plurality of first electrodes 311 through the plurality of openings KK. The light emitting device layer 300 includes a plurality of light emitting devices 300 a , and the light emitting device 300 a includes a first electrode 311 , a light emitting function layer 320 , and a portion of a second electrode layer 330 located above the first electrode 311 .

[0048] The isolation column layer 400 is located between the pixel definition layer PDL and the light-emitting functional layer 320. The isolation column layer 400 includes a plurality of first isolation columns 410 and a plurality of second isolation columns 420. The plurality of first isolation columns 410 are located in the display area AA, and the plurality of second isolation columns 420 are located in the peripheral area NA and in the bendable area SX. The plurality of first isolation columns 410 and the plurality of second isolation columns 420 are used to support the mask used in the process of forming the light-emitting functional layer 320 and the second electrode layer 330 by evaporation.

[0049] The second spacer column 420 includes a recessed portion 421 on a side away from the base substrate 100, and the recessed portion 421 is at least partially recessed into the second spacer column 420 in a direction close to the base substrate 100. By providing the recessed portion 421 in the second spacer column 420 located in the peripheral area NA and in the bendable area SX, when the portion of the display substrate located in the bendable area SX is bent (for example, folded or curled), the problem of film cracks caused by stress concentration at the second spacer column 420 can be effectively avoided.

[0050] In addition, a portion of the light-emitting functional layer 320 is located in the recessed portion 421 of the second isolation column 420, and the contact area between the light-emitting functional layer 320 and the second isolation column 420 is increased, so that the light-emitting functional layer 320 and the second isolation column 420 have better adhesion, which can effectively avoid the problem of peeling at the interface between the light-emitting functional layer 320 and the second isolation column 420 when the display substrate is bent.

[0051] According to some exemplary embodiments, the light-emitting functional layer 320 may include a hole injection layer on the first electrode layer 310, a hole transport layer on the side of the hole injection layer away from the base substrate 100, a light-emitting layer on the side of the hole transport layer away from the base substrate 100, an electron transport layer on the side of the light-emitting layer away from the base substrate 100, and an electron injection layer on the side of the electron transport layer away from the base substrate 100. When the light-emitting functional layer 320 includes the aforementioned film layers, the film layer directly contacting the second isolation column 420 may be the hole injection layer.

[0052] According to some exemplary embodiments, the base substrate 100 may be formed of a flexible material having excellent heat resistance and durability, such as polyimide (PI), polycarbonate (PC), polyethylene terephthalate (PET), polyethylene, polyacrylate, polyarylate, polyetherimide, polyethersulfone, polyethylene terephthalate (PET), polyethylene (PE), polypropylene (PP), polysulfone (PSF), polymethyl methacrylate (PMMA), triacetyl cellulose (TAC), cycloolefin polymer (COP), cycloolefin copolymer (COC), and the like.

[0053] According to some exemplary embodiments, the first direction X may be perpendicular to the second direction Y, the first direction X may be a row direction, that is, an extension direction of the scan lines in the driving circuit layer, and the second direction Y may be a column direction, that is, an extension direction of the data lines in the driving circuit layer, or the first direction X may be a column direction and the second direction Y may be a row direction.

[0054] According to some exemplary embodiments, referring to Figure 1 The display substrate includes a foldable area S1 and a plane area S2, for example, it may include one foldable area S1 and two plane areas S2, and the two plane areas S2 are respectively located on both sides of the foldable area S1 along the first direction X. The portion of the display substrate located in the foldable area S1 can be bent or unfolded along the folding axis Z1, thereby realizing the switching of the display form and the display area. The second isolation column 420 is located in the peripheral area NA and in the foldable area S1.

[0055] It should be noted that Figure 1A schematic description is given by taking a case where there is only one foldable area S1, that is, a display substrate that is a single-foldable display substrate, as an example. The display substrate may also include two, three or more foldable areas S1, so as to achieve double-folding or triple-folding display, which is not limited in the embodiments of the present disclosure.

[0056] It should be noted that, for the display substrate, the folding axis Z1 is only a virtual concept, and the folding axis Z1 structure does not exist in the display substrate. For a display device including the display substrate, the folding axis Z1 can be considered as the axis of a folding mechanism (eg, a hinge) that controls the folding of the display substrate.

[0057] According to some exemplary embodiments, referring to Figure 1 , the isolation column layer 400 further includes a plurality of third isolation columns 430, the plurality of third isolation columns 430 are located in the peripheral area NA and in the plane area S2, and the structure of the third isolation columns 430 may be consistent with the structure of the second isolation columns 420. Alternatively, the structure of the third isolation columns 430 may also be consistent with the structure of the first isolation columns 410. Alternatively, the structure of the third isolation columns 430 may also be different from the structures of the first isolation columns 410 and the second isolation columns 420. The structure of the third isolation columns 430 is set according to actual process requirements.

[0058] It should be noted that in Figure 1 , only a portion of the first isolation columns 410, a portion of the second isolation columns 420, and a portion of the third isolation columns 430 are schematically shown. According to actual needs, more first isolation columns 410, second isolation columns 420, and third isolation columns 430 may be provided, and the distribution mode and distribution density of the first isolation columns 410, the second isolation columns 420, and the third isolation columns 430 are not limited in the embodiment of the present disclosure.

[0059] Figure 4 A schematic plan view of a display substrate according to an embodiment of the present disclosure is schematically shown.

[0060] According to some exemplary embodiments, referring to Figure 4 The display substrate includes a rollable area S3 and a plane area S2, for example, a rollable area S3 and a plane area S2 connected along a first direction X. The portion of the display substrate located in the rollable area S3 can be bent or unfolded along a roll axis Z2, thereby realizing the switching of display form and display area. The second isolation column 420 is located in the peripheral area NA and in the rollable area S3.

[0061] It should be noted that Figure 4The schematic description is given with only one rollable region S3. As required, two or more rollable regions S3 may be provided in the display substrate. Alternatively, the display substrate may include only one rollable region S3 and no planar region S2, which is not limited in the embodiment of the present disclosure.

[0062] It should be noted that for the display substrate, the curling axis Z2 is just a virtual concept, and there is no curling axis Z2 structure in the display substrate. For a display device including the display substrate, the curling axis Z2 can be considered as the axis of the curling mechanism that controls the curling of the display substrate.

[0063] It should be noted that the display substrate may also be provided with a foldable area S1 and a rollable area S3 at the same time, so that the display substrate can be both folded and rollable, thereby enabling the display substrate to meet the needs of more diversified display scenarios.

[0064] According to some exemplary embodiments, referring to Figure 3 The base substrate 100 includes a first surface 100a facing the driving circuit layer 200. In a direction perpendicular to the first surface 100a, the recessed portion 421 penetrates the second isolation column 420, that is, at the recessed portion 421, the light-emitting functional layer 320 contacts the pixel definition layer PDL through the recessed portion 421. With such an arrangement, when the display substrate is bent, the problem of film cracks due to stress concentration at the second isolation column 420 can be more effectively avoided. In addition, the preparation process of the isolation column layer 400 can also be simplified.

[0065] According to some exemplary embodiments, referring to Figure 2 The edge shape of the orthographic projection of the second spacer column 420 on the base substrate 100 includes an ellipse. The inventors have found that setting the edge profile of the second spacer column 420 to an ellipse is more conducive to avoiding the problem of film cracks due to stress concentration at the second spacer column 420, compared with a structure with a circular edge profile.

[0066] According to some exemplary embodiments, in combination with reference Figure 1 and Figure 2 The portion of the display substrate located in the foldable area S1 is configured to be bendable along a folding axis Z1, the extension direction of the folding axis Z1 is substantially parallel to the second direction Y, and the extension direction of the major axis Z3 of the ellipse is substantially parallel to the second direction Y, that is, the extension direction of the folding axis Z1 is substantially parallel to the extension direction of the major axis Z3 of the ellipse. In this way, when the display substrate is bent, the problem of film cracks caused by stress concentration at the second isolation column 420 can be more effectively avoided.

[0067] It should be noted that the two directions described herein are substantially parallel, which should be understood as the angle between the two directions being less than or equal to 10°.

[0068] According to some exemplary embodiments, in combination with reference Figure 2 and Figure 4 The portion of the display substrate located in the rollable area S3 is configured to be bendable along the roll axis Z2, the extension direction of the roll axis Z2 is substantially parallel to the second direction Y, and the extension direction of the major axis Z3 of the ellipse is substantially parallel to the second direction Y, that is, the extension direction of the roll axis Z2 is substantially parallel to the extension direction of the major axis Z3 of the ellipse. In this way, when the display substrate is bent, the problem of film cracks caused by stress concentration at the second isolation column 420 can be more effectively avoided.

[0069] According to some exemplary embodiments, referring to Figure 2 The second isolation column 420 includes two recessed portions 421, and the two recessed portions 421 are arranged at intervals along the long axis Z3 direction of the ellipse. When the edge profile of the second isolation column 420 is an ellipse, the two recessed portions 421 are arranged at intervals along the long axis Z3 direction of the ellipse, which can more effectively avoid the problem of film cracks caused by stress concentration at the second isolation column 420.

[0070] Figure 5 Schematically shows Figure 1 Another magnified view of area A in the middle. Figure 6 The cross-sectional view of a display substrate according to an embodiment of the present disclosure is schematically shown, wherein: Figure 6 Schematically shows the Figure 5 Cross-section taken along center line CC'.

[0071] According to some exemplary embodiments, in combination with reference Figure 5 and Figure 6 The display substrate further includes a covering portion 440 located on a side of the second isolation column 420 away from the base substrate 100, the orthographic projection of the covering portion 440 on the base substrate 100 at least partially overlaps with the orthographic projection of the second isolation column 420 on the base substrate 100, and the surface roughness of the covering portion 440 is greater than the surface roughness of the second isolation column 420. The light-emitting function layer 320 in the light-emitting device layer 300 contacts the covering portion 440.

[0072] By providing a covering portion 440 with a larger surface roughness on the side of the second isolation column 420 away from the base substrate 100, the adhesion between the light-emitting functional layer 320 and the second isolation column 420 can be effectively improved, and the problem of peeling at the interface between the light-emitting functional layer 320 and the second isolation column 420 when the display substrate is bent can be more effectively avoided.

[0073] Figure 7The surface microscopic morphology of the covering portion of the display substrate according to the embodiment of the present disclosure is schematically shown.

[0074] According to some exemplary embodiments, in combination with reference Figure 6 and Figure 7 The material of the covering portion 440 includes molybdenum. It can be seen that there are closely arranged columnar structures on the surface of the covering portion 440, and there are many grooves between the columnar structures, so that the covering portion 440 has a higher surface roughness.

[0075] According to some exemplary embodiments, referring to Figure 6 The covering portion 440 covers the recessed portion 421 of the second isolation column 420 , that is, the orthographic projection of the covering portion 440 on the base substrate 100 covers the orthographic projection of the recessed portion 421 on the base substrate 100 .

[0076] It should be noted that when the covering portion 440 is disposed on the second isolation column 420, the planar structure of the second isolation column 420 can refer to Figure 2 , that is, two recessed portions 421 are provided in the second isolation column 420 , and the covering portion 440 covers both of the two recessed portions 421 .

[0077] Alternatively, the second isolation column 420 may also be provided with only one recessed portion 421 located at the center of the second isolation column 420 , and the covering portion 440 covers the recessed portion 421 .

[0078] According to some exemplary embodiments, referring to Figure 6 , the orthographic projection of the covering portion 440 on the base substrate 100 is located inside the edge of the orthographic projection of the second isolation column 420 on the base substrate 100. That is, the light-emitting functional layer 320 is in contact with both the second isolation column 420 and the covering portion 440. Such a configuration can effectively improve the adhesion between the light-emitting functional layer 320 and the second isolation column 420, and can more effectively avoid the problem of peeling at the interface between the light-emitting functional layer 320 and the second isolation column 420 when the display substrate is bent.

[0079] According to some exemplary embodiments, referring to Figure 1 The shape of the first isolation column 410 and the shape of the second isolation column 420 may be different, and the shape of the orthographic projection of the first isolation column 410 on the base substrate 100 includes a circle.

[0080] According to some exemplary embodiments, in combination with reference Figure 1 and Figure 2, the size of the second isolation column 420 along the first direction X is larger than the size of the first isolation column 410 along the first direction X, and the size of the second isolation column 420 along the second direction Y is larger than the size of the first isolation column 410 along the second direction Y. The second isolation column 420 can be set slightly larger, so that the second isolation column 420 can have the structure described above.

[0081] Figure 8 A cross-sectional view of a display module according to an embodiment of the present disclosure is schematically shown.

[0082] At least some embodiments of the present disclosure further provide a display module, referring to Figure 8 The display module includes a display substrate 10, which is the display substrate described above.

[0083] Reference Figure 8 The display module may also include a touch layer TSP located on the light emitting surface side of the display substrate 10, a color filter layer COE located on the side of the touch layer TSP away from the display substrate 10, a first optical adhesive layer OCA1 located on the side of the color filter layer COE away from the display substrate 10, a flexible cover plate Cover located on the side of the first optical adhesive layer OCA1 away from the base substrate 100, and a back film layer BF located on the side of the display substrate 10 away from the touch layer.

[0084] For example, the flexible cover Cover may include ultra-thin glass UTG, a second optical adhesive layer OCA2 located on the side of the ultra-thin glass UTG away from the display substrate 10, and a protective layer PET located on the side of the second optical adhesive layer OCA2 away from the display substrate 10, and the material of the protective layer PET may include polyethylene terephthalate (PET).

[0085] At least some embodiments of the present disclosure also provide a display device, which includes a display substrate or a display module as described above. The display device may include any device or product having a display function. For example, the display device may be a smart phone, a mobile phone, an e-book reader, a desktop computer (PC), a laptop PC, a netbook PC, a personal digital assistant (PDA), a portable multimedia player (PMP), a digital audio player, a mobile medical device, a camera, a wearable device (such as a head-mounted device, an electronic clothing, an electronic bracelet, an electronic necklace, an electronic accessory, an electronic tattoo, or a smart watch), a television, etc.

[0086] It should be understood that the display device according to some exemplary embodiments of the present disclosure has all the features and advantages of the above-mentioned display substrate, and these features and advantages can be referred to the above description of the display substrate, which will not be repeated here.

[0087] As used herein, the terms "substantially," "approximately," "approximately," and other similar terms are used as terms of approximation rather than as terms of degree, and they are intended to account for the inherent deviations in measured or calculated values ​​that would be recognized by one of ordinary skill in the art. Taking into account factors such as process fluctuations, measurement problems, and errors associated with the measurement of a particular quantity (i.e., limitations of the measurement system), "approximately" or "approximately" as used herein include the stated value and mean that the particular value is within an acceptable range of deviation as determined by one of ordinary skill in the art. For example, "approximately" can mean within one or more standard deviations, or within ±10% or ±5% of the stated value.

[0088] Although some embodiments according to the general inventive concept of the present disclosure have been illustrated and described, it will be appreciated by those skilled in the art that changes may be made to these embodiments without departing from the principles and spirit of the general inventive concept of the present disclosure, the scope of which is defined by the claims and their equivalents.

Claims

1. A display substrate, comprising a display area and a peripheral area located around the display area, wherein: The display substrate comprises: substrate substrate; A driving circuit layer, located on the substrate; a light emitting device layer, located on a side of the driving circuit layer away from the base substrate, the light emitting device layer comprising a plurality of light emitting devices, the plurality of light emitting devices being arranged at intervals along a first direction and a second direction; and an isolation column layer, located on a side of the driving circuit layer away from the base substrate, the isolation column layer comprising a plurality of first isolation columns, the plurality of first isolation columns being located in the display area, Among them, the display substrate includes a bendable area, the isolation column layer also includes at least one second isolation column located in the peripheral area, and the second isolation column is located in the bendable area, and the side of the second isolation column away from the base substrate includes a recessed portion, and the recessed portion is at least partially recessed in the second isolation column in a direction close to the base substrate.

2. The display substrate according to claim 1, wherein: The base substrate includes a first surface facing the driving circuit layer, and the recessed portion penetrates the second isolation column along a direction perpendicular to the first surface.

3. The display substrate according to claim 1 or 2, wherein: An edge shape of an orthographic projection of the second isolation column on the base substrate includes an ellipse.

4. The display substrate according to claim 3, wherein: The second isolation column includes two recessed portions, and the two recessed portions are arranged at intervals along the major axis direction of the ellipse.

5. The display substrate according to claim 3 or 4, wherein: The portion of the display substrate located in the bendable region is configured to be bendable along a folding axis, and the folding axis is substantially parallel to the second direction; and / or the portion of the display substrate located in the bendable region is configured to be curled along a rolling axis, and the rolling axis is substantially parallel to the second direction; and The major axis of the ellipse is substantially parallel to the second direction.

6. The display substrate according to any one of claims 1 to 5, wherein: The bendable region includes a foldable region, and at least one of the second isolation columns is located in the foldable region; and / or, The bendable region includes a rollable region, and at least one of the second isolation columns is located in the rollable region.

7. The display substrate according to any one of claims 1 to 6, wherein: The display substrate further comprises a covering portion located on a side of the second isolation column away from the base substrate, the orthographic projection of the covering portion on the base substrate at least partially overlaps the orthographic projection of the second isolation column on the base substrate, and the surface roughness of the covering portion is greater than the surface roughness of the second isolation column; as well as The light emitting device layer includes a first electrode layer located on the base substrate, a light emitting functional layer located on a side of the first electrode layer away from the base substrate, and a second electrode layer located on a side of the light emitting functional layer away from the base substrate, wherein the light emitting functional layer contacts the covering portion.

8. The display substrate according to claim 7, wherein: The material of the cover portion includes molybdenum.

9. The display substrate according to claim 7 or 8, wherein: The covering portion covers the recessed portion of the second isolation column.

10. The display substrate according to claim 9, wherein: The orthographic projection of the covering portion on the base substrate is located inside an edge of the orthographic projection of the second isolation column on the base substrate.

11. The display substrate according to any one of claims 1 to 10, wherein: The shape of the orthographic projection of the first isolation column on the base substrate includes a circle; and / or, The size of the second isolation column along the first direction is greater than the size of the first isolation column along the first direction; and / or, A size of the second isolation column along the second direction is greater than a size of the first isolation column along the second direction.

12. A display device, wherein: The display device comprises the display substrate according to any one of claims 1 to 11.

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