Display panel and display device

Abstract

The invention provides a display panel and a display device. The display panel includes: a substrate; the light-emitting units are arranged on one side of the substrate; the light shielding layer is arranged on one side of the substrate, and at least part of the light shielding layer is located between the light emitting units; the stress adjusting layer is arranged on the sides, away from the substrate, of the light emitting units and covers at least part of the light shielding layer; wherein the thermal expansion coefficient of the stress adjusting layer is smaller than that of the substrate. According to the display panel, stress unbalance caused by shrinkage of the shading layer can be relieved, the substrate warping or cracking phenomenon caused by the stress unbalance is avoided, it is ensured that the shape of the substrate is flat, and then the display effect and the use reliability of the display panel are effectively improved.

Description

Technical Field

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

[0002] With the continuous development of display technology, Micro Light Emitting Diode Display (Micro-LED) displays have attracted widespread attention due to their high brightness, low power consumption and excellent color performance.

[0003] In the manufacturing process of Micro-LED displays, in order to improve the display effect and prevent light leakage, a black light-absorbing film layer is usually encapsulated on the upper surface of the display. The black light-absorbing film layer can effectively absorb excess light, thereby enhancing the contrast and color saturation of the display.

[0004] However, the curing temperature of the black light-absorbing film is relatively high, resulting in a relatively large thermal expansion, which is usually greater than the thermal expansion of the substrate (such as a glass substrate). Therefore, when the black light-absorbing film is cooled to room temperature after curing, it will shrink and generate stress. This stress imbalance can easily cause the substrate to warp, which has an adverse effect on the display effect and reliability of the display.

[0005] It should be noted that the information disclosed in the above background technology section is only used to enhance the understanding of the background of the present application, and therefore may include information that does not constitute prior art known to ordinary technicians in the field. Summary of the invention

[0006] Based on this, the embodiments of the present application provide a display panel and a display device, which can alleviate the stress imbalance caused by the shrinkage of the light-shielding layer, avoid warping or cracking of the substrate caused by the stress imbalance, ensure the flatness of the substrate shape, and effectively improve the display effect and reliability of the display panel.

[0007] According to some embodiments, the present application provides a display panel, including:

[0008] substrate;

[0009] A plurality of light-emitting units are arranged on one side of the substrate;

[0010] A light shielding layer, disposed on one side of the substrate and at least partially located between the light emitting units;

[0011] A stress adjustment layer, disposed on a side of the plurality of light-emitting units away from the substrate, and covering at least a portion of the light-shielding layer;

[0012] Wherein, the thermal expansion coefficient of the stress adjustment layer is smaller than the thermal expansion coefficient of the substrate.

[0013] According to some embodiments, the present application further provides a display device, including the display panel provided by the aforementioned embodiment.

[0014] It should be understood that the foregoing general description and the following detailed description are exemplary and explanatory only and are not restrictive of the present application.

[0015] The embodiments of the present application may or at least have the following advantages:

[0016] In the embodiment of the present application, a stress adjustment layer is provided on the side of the light-emitting unit away from the substrate. Since the thermal expansion coefficient of the stress adjustment layer is smaller than the thermal expansion coefficient of the substrate, the thermal expansion generated during the curing process of the light-shielding layer is relatively small. When returning to normal temperature, the shrinkage amplitude of the stress adjustment layer will be smaller than the shrinkage amplitude of the substrate, thereby forming tensile stress in the stress adjustment layer to offset the tensile stress generated by the shrinkage of the light-shielding layer.

[0017] Therefore, the embodiment of the present application can alleviate the stress imbalance caused by the shrinkage of the light-shielding layer, avoid the warping or cracking of the substrate caused by the stress imbalance, ensure the flatness of the substrate shape, and effectively improve the display effect and reliability of the display panel.

[0018] Other advantages, objectives and features of the present application will be described in the following description to some extent, and will be apparent to those skilled in the art based on the following examination and study, or can be taught from the practice of the present application to some extent. The objectives and other advantages of the present application can be achieved and obtained through the following description. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Other features, objects and advantages of the present application will become more apparent by reading the detailed description of non-limiting embodiments made with reference to the following drawings.

[0020] Figure 1 A schematic diagram of a cross-sectional structure of a display panel provided in some embodiments of the present application;

[0021] Figure 2 A schematic cross-sectional structure diagram of a display panel in some embodiments of the present application in which a light shielding layer is provided with a first protrusion;

[0022] Figure 3 A schematic diagram of a cross-sectional structure of a display panel provided in some embodiments of the present application in which multiple light shielding layers and multiple stress adjustment layers are alternately stacked;

[0023] Figure 4 A schematic diagram of a cross-sectional structure of a display panel in which multiple light shielding layers and multiple stress adjustment layers are alternately stacked in some other embodiments of the present application;

[0024] Figure 5 A schematic diagram of a cross-sectional structure of a display panel including a light conversion layer provided in some embodiments of the present application;

[0025] Figure 6 A schematic diagram of a partial cross-sectional structure of a display panel provided in some embodiments of the present application;

[0026] Figure 7 A schematic diagram of a partial cross-sectional structure of a display panel provided in some other embodiments of the present application;

[0027] Figure 8 A schematic diagram of the cross-sectional structure of a display device provided in some embodiments of the present application.

[0028] Description of reference numerals:

[0029] 1. Display device; 10. Display panel;

[0030] 100, substrate; 101, array layer;

[0031] 200, light emitting unit;

[0032] 300, light shielding layer; 300a, first protrusion; 300b, first groove;

[0033] 400, stress adjustment layer; 400a, second protrusion; 400b, second groove; 401, first stress adjustment layer; 402, second stress adjustment layer; 403, third stress adjustment layer;

[0034] 500. Light conversion layer. DETAILED DESCRIPTION

[0035] In order to facilitate the understanding of the present application, the present application will be described more fully below with reference to the relevant drawings. The preferred embodiments of the present application are provided in the drawings. However, the present application can be implemented in many different forms and is not limited to the embodiments described herein. On the contrary, the purpose of providing these embodiments is to make the understanding of the disclosure of the present application more thorough and comprehensive.

[0036] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as those commonly understood by those skilled in the art to which this application belongs. The terms used herein in the specification of this application are only for the purpose of describing specific embodiments and are not intended to limit this application.

[0037] It should be understood that when an element or layer is referred to as "on", it can be directly located on other elements or layers, or there can be intervening elements or layers. It should be understood that although the terms first, second, etc. can be used to describe various elements, components, regions, layers, stress adjustment layers and / or parts, these elements, components, regions, layers, stress adjustment layers and / or parts should not be limited by these terms. These terms are only used to distinguish one element, component, region, layer, stress adjustment layer or part from another element, component, region, layer, stress adjustment layer or part. Therefore, without departing from the teachings of the present application, the first element, component, region, layer, stress adjustment layer or part discussed below can be represented as a second element, component, region, layer or part; for example, the first stress adjustment layer can be referred to as the second stress adjustment layer, and similarly, the second stress adjustment layer can be referred to as the first stress adjustment layer; the first stress adjustment layer and the second stress adjustment layer are different stress adjustment layers.

[0038] Spatial relational terms such as "on..." may be used herein to describe the relationship of an element or feature shown in the figures to other elements or features. It should be understood that, in addition to the orientations shown in the figures, spatial relational terms also include different orientations of the device in use and operation. For example, if the device in the accompanying drawings is turned over, the element or feature described as "on..." will be oriented "below" the other elements or features. Therefore, the exemplary term "on..." may include both upper and lower orientations. In addition, the device may also include additional orientations (e.g., rotated 90 degrees or other orientations), and the spatial descriptors used herein are interpreted accordingly.

[0039] When used herein, the singular forms "a", "an", and "said / the" may also include plural forms, unless the context clearly indicates otherwise. It should also be understood that when the terms "consisting of" and / or "comprising" are used in this specification, the presence of the features, integers, elements and / or components may be determined, but the presence or addition of one or more other features, integers, elements, components and / or groups is not excluded. At the same time, when used herein, the term "and / or" includes any and all combinations of the relevant listed items.

[0040] In the manufacturing process of the display, in order to improve the display effect and prevent light leakage, a layer of black light-absorbing film is usually encapsulated on the upper surface of the display. The black light-absorbing film can effectively absorb excess light, thereby enhancing the contrast and color saturation of the display. However, the curing temperature of the black light-absorbing film is relatively high, resulting in a relatively large thermal expansion, which is usually greater than the thermal expansion of the substrate (such as a glass substrate). Therefore, when the black light-absorbing film is cooled to room temperature after curing, stress will be generated due to shrinkage. This stress imbalance can easily cause the substrate to warp, which has an adverse effect on the display effect and reliability of the display.

[0041] In view of the above shortcomings, the present application provides a display panel and a display device, which can alleviate the stress imbalance caused by the shrinkage of the light shielding layer, avoid the substrate warping or cracking caused by the stress imbalance, ensure the flatness of the substrate, and effectively improve the display effect and reliability of the display panel. The details will be described in the subsequent embodiments.

[0042] On the one hand, the present application provides a display panel. As an example, the display panel may include an organic light emitting diode display panel (Organic Light Emitting Diode, referred to as OLED), a quantum dot electroluminescent display panel (Quantum Dot Light Emitting Diodes, referred to as QLED), a sub-millimeter light emitting diode display (Mini Light Emitting Diode Display, referred to as Mini LED) or a micro light emitting diode display (Micro Light Emitting Diode Display, referred to as Micro-LED), etc., but is not limited thereto. The embodiment of the present application is described by taking the display panel as a Micro-LED display panel as an example.

[0043] See also Figure 1 The display panel provided in the present application may specifically include a substrate 100 , a plurality of light-emitting units 200 , a light-shielding layer 300 and a stress adjustment layer 400 .

[0044] Multiple light-emitting units 200 are arranged on one side of the substrate 100; the shading layer 300 is arranged on one side of the substrate 100 and is at least partially located between the light-emitting units 200; the stress adjustment layer 400 is arranged on the side of the multiple light-emitting units 200 away from the substrate 100 and covers at least part of the shading layer 300.

[0045] The thermal expansion coefficient of the stress adjustment layer 400 is smaller than the thermal expansion coefficient of the substrate 100 .

[0046] In conventional display panels, the thermal expansion coefficient of the light shielding layer 300 is usually greater than that of the substrate 100. When the temperature drops after high-temperature curing, the light shielding layer 300 contracts greatly, thus forming tensile stress inside the light shielding layer 300. The tensile stress is transmitted to the substrate 100, causing the substrate 100 to warp or deform.

[0047] In the display panel provided in the present application, a stress adjustment layer 400 is provided on a side of the light emitting unit 200 away from the substrate 100. Since the thermal expansion coefficient of the stress adjustment layer 400 is smaller than the thermal expansion coefficient of the substrate 100, the thermal expansion amount generated during the curing process of the light shielding layer 300 is relatively small. When returning to room temperature, the contraction amplitude of the stress adjustment layer 400 will be smaller than the contraction amplitude of the substrate 100, thereby forming tensile stress in the stress adjustment layer 400 to offset the tensile stress generated by the contraction of the light shielding layer 300.

[0048] Therefore, the embodiment of the present application can alleviate the stress imbalance caused by the shrinkage of the light shielding layer 300, avoid the warping or cracking of the substrate 100 caused by the stress imbalance, ensure the flatness of the substrate 100, and effectively improve the display effect and reliability of the display panel.

[0049] Specifically, the substrate 100 involved in the embodiment of the present application has a supporting and protective function for other film layers in the display panel. The embodiment of the present application does not limit the type and material of the substrate 100. As an example, the substrate 100 can be a rigid substrate, such as a glass substrate.

[0050] For example, Figure 1 As shown, an array layer 101 may be provided on one side of the substrate 100. The array layer 101 may include a plurality of thin film transistors, and the plurality of thin film transistors may constitute a pixel driving circuit for driving the light emitting unit 200 to perform light emitting display.

[0051] The light shielding layer 300 involved in the embodiment of the present application may include but is not limited to a black light absorbing film layer (Black Matrix, BM for short).

[0052] The embodiment of the present application does not specifically limit the implementation form of the stress adjustment layer 400. In some embodiments, the stress adjustment layer 400 may include a transparent film layer. The transparent film layer does not block or absorb light, thereby ensuring that the optical performance of the display panel is not affected, while solving the stress imbalance problem caused by thermal expansion differences, and maintaining the high light transmittance and high color reproduction of the display panel.

[0053] The embodiment of the present application does not specifically limit the material of the stress adjustment layer 400. In some embodiments, the stress adjustment layer 400 may include a silicon oxide film layer. The silicon oxide film layer has a lower thermal expansion coefficient and can form a significant difference in thermal expansion coefficient with the substrate 100, thereby effectively releasing the stress imbalance caused by the difference in thermal expansion coefficient between the light shielding layer 300 and the substrate 100 during temperature changes, thereby reducing the risk of warping and cracking of the substrate 100. In addition, the process technology for preparing the silicon oxide film layer is mature, highly controllable, and has good process compatibility, and can be well integrated into the manufacturing process of the display panel. Therefore, using a silicon oxide film layer as the stress adjustment layer 400 also helps to simplify the manufacturing process and improve production efficiency.

[0054] The embodiment of the present application does not specifically limit the magnitude relationship between the thermal expansion coefficients of the stress adjustment layer 400 and the light shielding layer 300. In some embodiments, the thermal expansion coefficient of the stress adjustment layer 400 is smaller than the thermal expansion coefficient of the light shielding layer 300.

[0055] As for the thermal expansion coefficients of the stress adjustment layer 400 and the light emitting unit 200 , there is no restriction on the size relationship, that is, it is allowed for either of them to have a smaller thermal expansion coefficient.

[0056] See also Figure 2 In some embodiments, the surface of the light shielding layer 300 facing the stress adjustment layer 400 may be provided with a plurality of first protrusions 300a arranged alternately. The plurality of first protrusions 300a and the surface of the stress adjustment layer 400 facing the plurality of first protrusions 300a are wedged with each other.

[0057] By wedging the first protrusion 300a with the surface of the stress adjustment layer 400 to form a bite structure, the interface bonding strength between the light shielding layer 300 and the stress adjustment layer 400 can be effectively improved, the adhesion between the light shielding layer 300 and the stress adjustment layer 400 can be enhanced, and the interlayer peeling caused by the stress correction process or other external forces can be prevented. Moreover, the mutual wedging of the first protrusion 300a with the surface of the stress adjustment layer 400 can also effectively restrict the relative movement between the light shielding layer 300 and the stress adjustment layer 400. Therefore, it is beneficial to improve the overall stability of the display panel structure.

[0058] Please continue reading Figure 2 It is understood that in some embodiments, the surface of the light-shielding layer 300 facing the stress adjustment layer 400 is provided with a plurality of first protrusions 300a and a plurality of first grooves 300b arranged alternately; the surface of the stress adjustment layer 400 facing the light-shielding layer 300 is provided with a plurality of second protrusions 400a and a plurality of second grooves 400b arranged alternately.

[0059] like Figure 2As shown, the first protrusions 300a match the second grooves 400b in a one-to-one correspondence, and the first grooves 300b match the second protrusions 400a in a one-to-one correspondence.

[0060] The first protrusion 300a and the second groove 400b, as well as the first groove 300b and the second protrusion 400a, correspond to each other to form a stable interlocking convex-concave structure. The convex-concave structure here constrains the light-shielding layer 300 and the stress adjustment layer 400 through a close matching relationship, so that the two always maintain a stable combination state during thermal expansion and contraction, thereby further enhancing the interface bonding strength between the light-shielding layer 300 and the stress adjustment layer 400, more effectively avoiding interlayer peeling caused by the stress correction process or other external forces, and is beneficial to improving the overall stability of the display panel structure.

[0061] In some embodiments, the light shielding layer 300 may have multiple layers, and the stress adjustment layer 400 may also have multiple layers. Figure 3 It is understood that the multi-layer light shielding layer 300 and the multi-layer stress adjustment layer 400 are alternately stacked in sequence along the direction away from the substrate 100 , and the stress adjustment layer 400 farthest from the substrate 100 covers at least a portion of the light shielding layer 300 farthest from the substrate 100 .

[0062] In the above embodiment, a design of alternatingly stacking a plurality of light shielding layers 300 and a plurality of stress adjustment layers 400 is adopted. The plurality of stress adjustment layers 400 buffer the thermal expansion mismatch between the light shielding layer 300 and the substrate 100 layer by layer, thereby forming a multi-level stress adjustment effect, and the overall stress can be dispersed to each stress adjustment layer 400, further reducing the risk of warping and cracking of the substrate 100. In addition, the alternating layered structure can provide more contact interfaces, enhance the overall bonding strength between the light shielding layer 300 and the stress adjustment layer 400, and prevent interlayer peeling caused by the stress correction process or other external forces, thereby further improving the structural stability of the display panel.

[0063] In some embodiments, the multi-layer stress adjustment layer 400 includes a first stress adjustment layer 401 and a second stress adjustment layer 402. Figure 3 It is understood that the first stress adjustment layer 401 is located between the second stress adjustment layer 402 and the substrate 100 .

[0064] In the present embodiment, the difference between the thermal expansion coefficient of the first stress adjustment layer 401 and the thermal expansion coefficient of the substrate 100 is smaller than the difference between the thermal expansion coefficient of the second stress adjustment layer 402 and the thermal expansion coefficient of the substrate 100 .

[0065] Among them, the first stress adjustment layer 401 has a larger thermal expansion coefficient and is closer to the substrate 100, so that it can more effectively offset the tensile stress caused by the contraction of the shading layer 300 when the temperature changes, and protect the substrate 100 from damage caused by stress imbalance; while the second stress adjustment layer 402 has a smaller thermal expansion coefficient, which can balance the stress distribution inside the multi-layer stress adjustment layer 400, ensuring the stability of the entire structure of the multi-layer stress adjustment layer 400 during use, especially in an environment of thermal cycle or drastic temperature changes, to avoid the problem of thermal expansion mismatch.

[0066] Furthermore, in the multi-layer stress adjustment layer 400, the difference between the thermal expansion coefficient of each stress adjustment layer 400 and the thermal expansion coefficient of the substrate 100 may gradually decrease in the direction close to the substrate 100. Figure 4 As shown, the multilayer stress adjustment layer 400 includes a third stress adjustment layer 403, a second stress adjustment layer 402 and a first stress adjustment layer 401 which are stacked in sequence along a direction close to the substrate 100. The difference between the thermal expansion coefficients of the third stress adjustment layer 403, the second stress adjustment layer 402 and the first stress adjustment layer 401 and the thermal expansion coefficient of the substrate 100 gradually decreases along the direction close to the substrate 100, thereby achieving a smooth transition of stress.

[0067] In this example, the thermal expansion difference between the multi-layer stress adjustment layer 400 and the substrate 100 changes in a gradient, which can better adapt to changes during the thermal cycle process. The gradually decreasing difference in thermal expansion coefficient makes the influence of each layer of stress adjustment layer 400 on the substrate 100 gradually reduce, avoiding problems such as thermal stress concentration or uneven expansion due to sudden temperature changes, and preventing the substrate 100 from warping or cracking due to local stress accumulation.

[0068] See also Figure 5 In some embodiments, the display panel may further include a light conversion layer 500 correspondingly disposed on a side of the plurality of light emitting units 200 away from the substrate 100 .

[0069] The light conversion layer 500 can be used to convert the light emitted by the light emitting unit 200 to achieve the desired color and brightness. As an example, the light conversion layer 500 can include a quantum dot film or a phosphor layer, but is not limited thereto.

[0070] like Figure 5 As shown, in the above embodiment, the stress adjustment layer 400 can be disposed on the side of the light conversion layer 500 away from the light emitting unit 200. In this case, the stress adjustment layer 400 is farther away from the substrate 100, which can achieve a better stress balance effect, effectively avoid the warping problem of the substrate 100 caused by temperature fluctuations, and further enhance the durability and reliability of the display panel.

[0071] In some embodiments, the display panel may further include a color resist layer correspondingly disposed on a side of the plurality of light emitting units 200 away from the substrate 100. In this embodiment, the stress adjustment layer 400 may be disposed on a side of the color resist layer away from the light emitting unit 200.

[0072] Exemplarily, the thermal expansion coefficient of at least one of the light conversion layer 500 and the color resist layer is greater than the thermal expansion coefficient of the stress adjustment layer 400 .

[0073] In some embodiments, the stress adjustment layer 400 and the light shielding layer 300 at least partially do not overlap. Figure 6 As shown, at the edge of the display panel, the stress adjustment layer 400 is retracted into the light shielding layer 300. In this way, the defect of obvious borders or seams at the joints of the display panels can be effectively avoided.

[0074] For example, when the above-mentioned embodiments are applied to manufacture a borderless splicing display device, the design in which the stress adjustment layer 400 and the light-shielding layer 300 at least partially do not overlap can make the splicing area smoother, more natural and less noticeable, thereby effectively hiding the splicing gap and reducing the visual interference caused by the splicing lines or frames, so that the display device can achieve a smoother display effect.

[0075] In some other embodiments, the orthographic projection of the light shielding layer 300 on the substrate 100 falls within the range of the orthographic projection of the stress adjustment layer 400 on the substrate 100. Figure 7 As shown, the stress adjustment layer 400 is appropriately expanded at the edge of the display panel to wrap and protect the light shielding layer 300. In this way, the physical damage of the light shielding layer 300 caused by external environmental influences (such as friction, impact, etc.) in the edge area can be effectively reduced, and the service life of the light shielding layer 300 can be extended.

[0076] When manufacturing a spliced ​​display device with a frame, the edge area of ​​the display panel is prone to peeling of the light shielding layer 300 due to the accumulation of mechanical or environmental stress. When the above embodiment is applied to the manufacture of a spliced ​​display device with a frame, by setting the stress adjustment layer 400 to moderately expand at the edge of the display panel, the orthographic projection of the light shielding layer 300 on the substrate 100 falls within the range of the orthographic projection of the stress adjustment layer 400 on the substrate 100, so that the stress adjustment layer 400 can effectively limit the peeling tendency of the light shielding layer 300, thereby further improving the durability and reliability of the display panel.

[0077] Based on the same inventive concept, the present application also provides a display device. Figure 8 The display device 1 includes the display panel 10 provided in the above embodiment. The display device 1 can also achieve the technical effects that the above display panel 10 can achieve, which will not be described in detail here.

[0078] It can be understood that the display device 1 in the embodiment of the present application can be a Micro-LED display device, electronic paper, mobile phone, tablet computer, television, monitor, laptop computer, digital photo frame, navigator, wearable device, Internet of Things device, etc., any product or component with display function, and the embodiment of the present application is not limited to this.

[0079] The technical features of the above-described embodiments may be arbitrarily combined. To make the description concise, not all possible combinations of the technical features of the above-described embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0080] The above-described embodiments only express several implementation methods of the present application, and the descriptions thereof are relatively specific and detailed, but they cannot be construed as limiting the scope of the patent application. It should be pointed out that, for a person of ordinary skill in the art, several variations and improvements can be made without departing from the concept of the present application, and these all belong to the protection scope of the present application. Therefore, the protection scope of the patent application shall be subject to the attached claims.

Claims

1. A display panel, characterized in that: include: substrate; A plurality of light-emitting units are arranged on one side of the substrate; A light shielding layer, disposed on one side of the substrate and at least partially located between the light emitting units; A stress adjustment layer, disposed on a side of the plurality of light-emitting units away from the substrate, and covering at least a portion of the light-shielding layer; Wherein, the thermal expansion coefficient of the stress adjustment layer is smaller than the thermal expansion coefficient of the substrate.

2. The display panel according to claim 1, characterized in that: A surface of the light shielding layer facing the stress adjustment layer is provided with a plurality of first protrusions arranged alternately; the plurality of first protrusions and the surface of the stress adjustment layer facing the plurality of first protrusions are wedged with each other.

3. The display panel according to claim 2, characterized in that: The surface of the light shielding layer facing the stress adjustment layer is provided with a plurality of first protrusions and a plurality of first grooves arranged alternately; The surface of the stress adjustment layer facing the light shielding layer is provided with a plurality of second protrusions and a plurality of second grooves arranged alternately; The first protrusions match the second grooves in a one-to-one correspondence, and the first grooves match the second protrusions in a one-to-one correspondence.

4. The display panel according to claim 1, characterized in that: The light shielding layer is provided with multiple layers, and the stress adjustment layer is provided with multiple layers; The plurality of light shielding layers and the plurality of stress adjustment layers are alternately stacked in sequence along a direction away from the substrate, and the stress adjustment layer farthest from the substrate covers at least a portion of the light shielding layer farthest from the substrate.

5. The display panel according to claim 4, characterized in that: The multilayer stress adjustment layer includes a first stress adjustment layer and a second stress adjustment layer, the first stress adjustment layer is located between the second stress adjustment layer and the substrate, and the difference between the thermal expansion coefficient of the first stress adjustment layer and the thermal expansion coefficient of the substrate is smaller than the difference between the thermal expansion coefficient of the second stress adjustment layer and the thermal expansion coefficient of the substrate.

6. The display panel according to claim 1, characterized in that: The stress adjustment layer and the light shielding layer at least partially do not overlap.

7. The display panel according to claim 1, characterized in that: The orthographic projection of the light shielding layer on the substrate falls within the range of the orthographic projection of the stress adjustment layer on the substrate.

8. The display panel according to claim 1, characterized in that: The thermal expansion coefficient of the stress adjustment layer is smaller than the thermal expansion coefficient of the light shielding layer.

9. The display panel according to claim 1, characterized in that: The display panel further comprises: a light conversion layer and / or a color resistance layer, which is correspondingly arranged on a side of the plurality of light-emitting units away from the substrate; The stress adjustment layer is disposed on a side of the light conversion layer and / or the color resistance layer away from the light emitting unit.

10. The display panel according to claim 9, characterized in that: A thermal expansion coefficient of at least one of the light conversion layer and the color resistance layer is greater than a thermal expansion coefficient of the stress adjustment layer.

11. The display panel according to claim 1, characterized in that: The light shielding layer includes a black light absorbing film layer.

12. The display panel according to claim 1, characterized in that: The stress adjustment layer includes a transparent film layer.

13. The display panel according to claim 1 or 12, characterized in that: The stress adjustment layer includes a silicon oxide film layer.

14. A display device, characterized in that: The invention comprises the display panel as claimed in any one of claims 1 to 13.

Images