Stretchable display panels

Abstract

The present application provides a stretchable display panel. The stretchable display panel includes a driving substrate, a pixel definition layer, a light-emitting element, a dielectric layer, and a control electrode layer; wherein the dielectric layer includes a first dielectric layer, a second dielectric layer, a third dielectric layer, and a fourth dielectric layer. When the stretchable display panel is not in use, the refractive indexes of the first dielectric layer and the fourth dielectric layer are the same, and the refractive index of the second dielectric layer is less than the refractive index of the third dielectric layer. The stretchable display panel controls the dielectric layer through the control electrode layer, so that the control electrode layer controls the refractive index of the dielectric layer; when the stretchable display panel is not stretched, the light is collimated to improve the light extraction rate; when stretched, the light is further scattered to increase the area coverage of the light emission, improve the display effect after stretching, and thus improve the display quality of the stretchable display panel.

Description

Technical Field

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

[0002] With the continuous development of display technology, people's demands for the form of display devices are becoming more and more diverse. Therefore, stretchable display panels have become a pursuit of people. Compared with liquid crystal display panels (LCD), organic light emitting diode (OLED) stretchable display panels have many advantages such as full solid state, active light emission, high brightness, high contrast, ultra-thin, low power consumption, no viewing angle limitation, and wide operating temperature range.

[0003] The current design of stretchable display panels includes a stretchable part and a non-stretchable part. The non-stretchable part is a pixel and is fixed. When stretching, it is mainly the stretchable part that is stretched. After stretching, the display area becomes larger, but the luminous area of ​​the pixel does not change, resulting in a decrease in the display quality of the stretchable display panel. Summary of the invention

[0004] The present application provides a stretchable display panel, which is mainly used to solve the technical problem that the display area of ​​the existing stretchable display panel becomes larger after being stretched, but the area of ​​pixel light emission does not change, thereby causing the display quality of the stretchable display panel to decrease.

[0005] In order to solve the above technical problems, a technical solution adopted in the present application is to provide a stretchable display panel having a light emitting surface, including:

[0006] Driver substrate;

[0007] A pixel definition layer, disposed on one side of the driving substrate, wherein the pixel definition layer has a plurality of openings;

[0008] A light emitting element is disposed in the opening; the light emitting surface is a surface of the light emitting element away from the driving substrate;

[0009] A dielectric layer is disposed on a side of the light emitting element away from the driving substrate; wherein the dielectric layer includes a first dielectric layer, a second dielectric layer, a third dielectric layer and a fourth dielectric layer;

[0010] The first dielectric layer is disposed on a side of the light emitting element away from the driving substrate, and a surface of the first dielectric layer on a side away from the light emitting element has a groove;

[0011] The second dielectric layer is disposed on a side of the first dielectric layer away from the driving substrate, and a portion of the second dielectric layer is disposed in the groove; a projection of the groove on the driving substrate is located within a projection of the light emitting element on the driving substrate;

[0012] The third dielectric layer is disposed on a side of the second dielectric layer away from the drive substrate, and the third dielectric layer has a protrusion protruding from the side of the second dielectric layer away from the drive substrate, and a projection of the protrusion on the drive substrate is located within a projection of the light emitting element on the drive substrate;

[0013] The fourth dielectric layer is disposed on a side of the third dielectric layer away from the driving substrate, and the fourth dielectric layer covers the third dielectric layer;

[0014] The stretchable display panel further includes:

[0015] A control electrode layer, wherein the control electrode layer is disposed on the surface of the dielectric layer;

[0016] When the stretchable display panel is not in use, the refractive indexes of the first medium layer and the fourth medium layer are the same, and the refractive index of the second medium layer is smaller than the refractive index of the third medium layer; and the control electrode layer is used to control the refractive index of the medium layer.

[0017] Wherein, the light emitting element comprises:

[0018] an anode electrode, disposed on one side of the driving substrate;

[0019] A light-emitting layer is arranged on a side of the anode electrode away from the driving substrate;

[0020] The cathode electrode is arranged on a side of the light emitting layer away from the driving substrate.

[0021] The second dielectric layer includes a recessed portion and a first extension portion; the recessed portion is a portion of the second dielectric layer disposed in the groove, and the first extension portion is a remaining portion of the second dielectric layer after removing the recessed portion;

[0022] The third dielectric layer includes the protruding portion and a second extending portion; wherein the protruding portion is a portion of the third dielectric layer protruding from a side of the second dielectric layer away from the drive substrate, and the second extending portion is a remaining portion of the third dielectric layer minus the protruding portion;

[0023] The projection of the recessed portion on the driving substrate is located within the projection of the light-emitting layer on the driving substrate; the projection of the raised portion on the driving substrate is located within the projection of the light-emitting layer on the driving substrate; and the first extending portion and the second extending portion are used for stretching.

[0024] Wherein, the control electrode layer comprises:

[0025] A first electrode is disposed between the first dielectric layer and the second dielectric layer;

[0026] A second electrode is disposed between the second dielectric layer and the third dielectric layer;

[0027] A third electrode is disposed between the third dielectric layer and the fourth dielectric layer;

[0028] The first electrode and the second electrode are used to control the refractive index of the second dielectric layer, and the second electrode and the third electrode are used to control the refractive index of the third dielectric layer.

[0029] The cross-sectional shape of the groove is semi-elliptical, the cross-sectional shape of the side wall surface of the groove is arc-shaped; the surface of one side of the recessed portion close to the driving substrate is an arc surface;

[0030] A surface of the protrusion away from the second dielectric layer is an arc surface.

[0031] Wherein, the second dielectric layer and the third dielectric layer are both made of materials having Pockels effect; or,

[0032] The second dielectric layer and the third dielectric layer are both made of materials having Kerr effect.

[0033] The material of the second dielectric layer and the third dielectric layer includes at least one of lithium niobate, lithium tantalate, barium borate and gallium arsenide, or the material of the second dielectric layer and the third dielectric layer is a non-centrosymmetric material.

[0034] When the stretchable display panel is in a non-stretched display state, the control electrode layer controls the refractive index of the second medium layer to be greater than the refractive index of the first medium layer, and controls the refractive index of the third medium layer to be equal to the refractive index of the first medium layer, so that the light of the light-emitting element is collimated and emitted from the light-emitting surface.

[0035] When the stretchable display panel is in a stretched display state, the control electrode layer controls the refractive index of the second medium layer to be equal to the refractive index of the first medium layer, and controls the refractive index of the third medium layer to be greater than the refractive index of the first medium layer, so that the light of the light-emitting element is scattered out of the light-emitting surface.

[0036] wherein the first electrode is in direct contact with the cathode electrode; or,

[0037] The first electrode and the cathode electrode are not in direct contact, and a first dielectric layer separates the first electrode from the cathode electrode.

[0038] The present application provides a stretchable display panel. The stretchable display panel has a light-emitting surface, including a driving substrate, a pixel definition layer, a light-emitting element, and a dielectric layer, wherein the dielectric layer includes a first dielectric layer, a second dielectric layer, a third dielectric layer, and a fourth dielectric layer. The first dielectric layer is arranged on a side of the light-emitting element away from the driving substrate, and a surface of the first dielectric layer on a side away from the light-emitting element has a groove. The second dielectric layer is arranged on a side of the first dielectric layer away from the driving substrate, and a portion of the second dielectric layer is arranged in the groove; the projection of the groove on the driving substrate is located within the projection of the light-emitting element on the driving substrate. The third dielectric layer is arranged on a side of the second dielectric layer away from the driving substrate, and the third dielectric layer has a protrusion protruding from the side of the second dielectric layer away from the driving substrate, and the projection of the protrusion on the driving substrate is located within the projection of the light-emitting element on the driving substrate. The fourth dielectric layer is arranged on a side of the third dielectric layer away from the driving substrate, and the fourth dielectric layer covers the third dielectric layer. The stretchable display panel also includes a control electrode layer. The control electrode layer is arranged on the surface of the dielectric layer; wherein, when the stretchable display panel is not in use, the refractive indexes of the first dielectric layer and the fourth dielectric layer are the same, and the refractive index of the second dielectric layer is less than the refractive index of the third dielectric layer; the control electrode layer is used to control the refractive index of the dielectric layer. The stretchable display panel controls the dielectric layer through the control electrode layer, so that the control electrode layer controls the refractive index of the dielectric layer; when the stretchable display panel is not stretched, the light is collimated to improve the light extraction rate; when stretched, the light is further scattered to increase the area coverage of the emitted light, improve the display effect after stretching, and thus improve the display quality of the stretchable display panel. BRIEF DESCRIPTION OF THE DRAWINGS

[0039] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings required for use in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0040] Figure 1 A schematic cross-sectional view of a stretchable display panel according to an embodiment of the present application;

[0041] Figure 2 A schematic cross-sectional view of a stretchable display panel in which a first electrode and a cathode electrode are in direct contact;

[0042] Figure 3A schematic diagram of light emission of a stretchable display panel in a non-stretched display state;

[0043] Figure 4 This is a simplified diagram showing the light emission of a stretchable display panel in a stretched display state.

[0044] Description of Figure Numbers:

[0045] 10-driving substrate; 20-pixel definition layer; 21-opening; 30-light-emitting element; 31-anode electrode; 32-light-emitting layer; 33-cathode electrode; 40-dielectric layer; 41-first dielectric layer; 411-groove; 42-second dielectric layer; 421-depressed portion; 422-first extension portion; 43-third dielectric layer; 431-raised portion; 432-second extension portion; 44-fourth dielectric layer; 50-control electrode layer; 51-first electrode; 52-second electrode; 53-third electrode; 100-stretchable display panel. DETAILED DESCRIPTION

[0046] The following will be combined with the drawings in the embodiments of the present application to clearly and completely describe the technical solutions in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of this application.

[0047] In the following description, for the purpose of explanation rather than limitation, specific details such as specific system structures, interfaces, and technologies are provided to facilitate a thorough understanding of the present application.

[0048] The terms "first", "second", "third" in this application are only used for descriptive purposes, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of indicated technical features. Thus, the features defined as "first", "second", "third" can expressly or implicitly include at least one of the features. In the description of this application, the meaning of "multiple" is at least two, such as two, three, etc., unless otherwise clearly and specifically defined. In the embodiments of this application, all directional indications (such as up, down, left, right, front, back...) are only used to explain the relative position relationship, movement, etc. between the components under a certain specific posture (as shown in the accompanying drawings). If the specific posture changes, the directional indication also changes accordingly. In addition, the terms "including" and "having" and any of their variations are intended to cover non-exclusive inclusions. For example, a process, method, system, product or device comprising a series of steps or units is not limited to the steps or units listed, but optionally also includes steps or units that are not listed, or optionally also includes other steps or units inherent to these processes, methods, products or devices.

[0049] Reference to "embodiments" herein means that a particular feature, structure, or characteristic described in conjunction with the embodiments may be included in at least one embodiment of the present application. The appearance of the phrase in various locations in the specification does not necessarily refer to the same embodiment, nor is it an independent or alternative embodiment that is mutually exclusive with other embodiments. It is explicitly and implicitly understood by those skilled in the art that the embodiments described herein may be combined with other embodiments.

[0050] With the continuous development of display technology, people's demands for the form of display devices are becoming more and more diverse. Therefore, stretchable display panels have also become a pursuit of people. The stretchable display panel in the related art includes a pixel part and a stretching part connected between the display units. When the stretchable display panel is stretched, the stretching part can produce adaptive deformation. However, the light-emitting area of ​​the pixel part does not change, resulting in a decrease in the display quality of the stretchable display panel.

[0051] In view of the above problems, the present application proposes a stretchable display panel, aiming to improve the display effect of the stretchable display panel.

[0052] The present application is described in detail below with reference to the accompanying drawings and embodiments.

[0053] See also Figure 1 , Figure 1 The present invention provides a stretchable display panel 100 having a light emitting surface. The stretchable display panel 100 includes a driving substrate 10, a pixel definition layer 20, a light emitting element 30 and a dielectric layer 40.

[0054] The driving substrate 10 is used to drive the light-emitting element 30 to emit light. In a specific embodiment, the driving substrate 10 generally includes a substrate (not shown) and a circuit layer (not shown) that are stacked. The pixel definition layer 20 is arranged on one side of the driving substrate 10, and the pixel definition layer 20 has a plurality of openings 21. The light-emitting element 30 is arranged in the opening 21. The pixel definition layer 20 has a plurality of openings 21, so there are a plurality of light-emitting elements 30, and each light-emitting element 30 corresponds to a pixel of a color. In a specific embodiment, the light-emitting element 30 includes a red light-emitting element 30, a green light-emitting element 30, and a blue light-emitting element 30. The light-emitting surface is a surface of the light-emitting element 30 away from the driving substrate 10. The dielectric layer 40 is arranged on the side of the light-emitting element 30 away from the driving substrate 10; wherein the dielectric layer 40 includes a first dielectric layer 41, a second dielectric layer 42, a third dielectric layer 43 and a fourth dielectric layer 44.

[0055] The first dielectric layer 41 is disposed on the side of the light emitting element 30 away from the driving substrate 10, and the surface of the first dielectric layer 41 on the side away from the light emitting element 30 has a groove 411. Specifically, the cross-sectional shape of the groove 411 is semi-elliptical, and the cross-sectional shape of the side wall surface of the groove 411 is arc-shaped. The second dielectric layer 42 is disposed on the side of the first dielectric layer 41 away from the driving substrate 10, and part of the second dielectric layer 42 is disposed in the groove 411; the projection of the groove 411 on the driving substrate 10 is located within the projection of the light emitting element 30 on the driving substrate 10. The third dielectric layer 43 is disposed on the side of the second dielectric layer 42 away from the driving substrate 10, and the third dielectric layer 43 has a protrusion 431 protruding from the side of the second dielectric layer 42 away from the driving substrate 10, and the projection of the protrusion 431 on the driving substrate 10 is located within the projection of the light emitting element 30 on the driving substrate 10. Specifically, the surface of the side of the protrusion 431 away from the second dielectric layer 42 is an arc surface. The fourth dielectric layer 44 is disposed on a side of the third dielectric layer 43 away from the driving substrate 10 , and the fourth dielectric layer 44 covers the third dielectric layer 43 .

[0056] In a specific embodiment, the second dielectric layer 42 and the third dielectric layer 43 are both made of materials with Pockels effect, which refers to the birefringence effect of light produced by an optical medium under a constant or alternating electric field; or, the second dielectric layer 42 and the third dielectric layer 43 are both made of materials with Kerr effect, which refers to the phenomenon of electrically induced birefringence that is proportional to the square of the electric field. A substance placed in an electric field is oriented (deflected) by its molecules under the action of electric force, and exhibits anisotropy, resulting in birefringence, that is, the refractive ability of the substance to light is different along two different directions. It can be understood that the materials of the second dielectric layer 42 and the third dielectric layer 43 are materials with variable refractive index. Specifically, the materials of the second dielectric layer 42 and the third dielectric layer 43 include at least one of lithium niobate (LiNbO3), lithium tantalate (LiTO3), barium borate (BBO) and gallium arsenide (GaAs), or other non-centrosymmetric materials. Among them, non-centrosymmetric materials include natural polymers such as carnauba wax, polypeptides, polysaccharides, hard rubber and synthetic polymers such as polycarbonate, polymethyl methacrylate, polypropylene, and copolymers of tetrafluoroethylene and perfluoropropylene.

[0057] The stretchable display panel 100 further includes a control electrode layer 50, which is disposed on the surface of the dielectric layer 40. When the stretchable display panel 100 is not in use, the refractive indexes of the first dielectric layer 41 and the fourth dielectric layer 44 are the same, and the refractive index of the second dielectric layer 42 is less than the refractive index of the third dielectric layer 43; the control electrode layer 50 is used to control the refractive index of the dielectric layer 40.

[0058] The stretchable display panel 100 controls the dielectric layer 40 by controlling the electrode layer 50, so that the control electrode layer 50 controls the refractive index of the dielectric layer 40; when the stretchable display panel 100 is not stretched, the light is collimated and the light extraction rate is improved; when stretched, the light is further scattered and the area coverage of the emitted light is increased, thereby improving the display effect after stretching, thereby improving the display quality of the stretchable display panel 100.

[0059] In a specific embodiment, the light emitting element 30 includes an anode electrode 31, a light emitting layer 32 and a cathode electrode 33. The anode electrode 31 is arranged on one side of the driving substrate 10. The light emitting layer 32 is arranged on the side of the anode electrode 31 away from the driving substrate 10. The cathode electrode 33 is arranged on the side of the light emitting layer 32 away from the driving substrate 10. The projection of the light emitting layer 32 on the driving substrate 10 is located within the projection of the entire second dielectric layer 42 and the entire third dielectric layer 43 on the driving substrate 10. The anode electrode 31 and the cathode electrode 33 are used to control the light emitting layer 32 to emit light. Among them, the cathode electrode 33 layer is made of transparent materials, such as ITO (indium tin oxide), etc., to reduce the blocking of the light emitted by the light emitting layer 32. The material of the anode electrode 31 includes but is not limited to metal materials such as aluminum, gold, silver, and aluminum-magnesium alloy.

[0060] Continue reading Figure 1 , the control electrode layer 50 includes a first electrode 51, a second electrode 52 and a third electrode 53. The three electrodes are connected to different signal inputs. The first electrode 51 is arranged between the first dielectric layer 41 and the second dielectric layer 42. The second electrode 52 is arranged between the second dielectric layer 42 and the third dielectric layer 43. The third electrode 53 is arranged between the third dielectric layer 43 and the fourth dielectric layer 44. Among them, the first electrode 51 and the second electrode 52 are used to control the refractive index of the second dielectric layer 42, and the second electrode 52 and the third electrode 53 are used to control the refractive index of the third dielectric layer 43.

[0061] Further, the second dielectric layer 42 includes a recessed portion 421 and a first extension portion 422. The recessed portion 421 is a portion of the second dielectric layer 42 disposed in the groove 411, and the surface of the recessed portion 421 on one side close to the drive substrate 10 is an arc surface. The first extension portion 422 is the remaining portion of the second dielectric layer 42 after removing the recessed portion 421. The third dielectric layer 43 includes a protruding portion 431 and a second extension portion 432; wherein the protruding portion 431 is a portion of the third dielectric layer 43 protruding from the side of the second dielectric layer 42 away from the drive substrate 10, and the projection of the protruding portion 431 on the drive substrate 10 is located within the projection of the light emitting element 30 on the drive substrate 10. The second extension portion 432 is the remaining portion of the third dielectric layer 43 after removing the protruding portion 431. The projection of the recessed portion 421 on the drive substrate 10 is located within the projection of the light emitting layer 32 on the drive substrate 10. The projection of the protruding portion 431 on the drive substrate 10 is located within the projection of the light emitting layer 32 on the drive substrate 10. The first extension portion 422 and the second extension portion 432 are used for stretching.

[0062] In a specific embodiment, the first electrode 51 and the cathode electrode 33 may be in direct contact, or the first electrode 51 and the cathode electrode 33 may not be in direct contact, and the first dielectric layer 41 separates the first electrode 51 and the cathode electrode 33 from each other. It can be understood that the first electrode 51 and the cathode electrode 33 may be shared. The first electrode 51 and the cathode electrode 33 are in direct contact, that is, the first electrode 51 and the cathode electrode 33 are shared, which can reduce the process flow, reduce the process difficulty, and improve the preparation yield. The first electrode 51 and the cathode electrode 33 are not in direct contact, that is, the first electrode 51 and the cathode electrode 33 are not shared, and the first dielectric layer 41 separates the first electrode 51 and the cathode electrode 33 from each other, which can avoid the first electrode 51 and the cathode electrode 33 from being connected together, and the separation can reduce interference between each other. Figure 1 , the first electrode 51 and the cathode electrode 33 are not in direct contact, and the first dielectric layer 41 separates the first electrode 51 and the cathode electrode 33 from each other. Figure 2 , Figure 2 The schematic diagram of the structural cross section of a stretchable display panel in which the first electrode is in direct contact with the cathode electrode.

[0063] Further reading Figure 1 and Figure 3 , Figure 3Schematic diagram of light emission of the stretchable display panel in the non-stretched display state. When the stretchable display panel 100 is in the non-stretched display state, the control electrode layer 50 controls the refractive index of the second dielectric layer 42 to be greater than the refractive index of the first dielectric layer 41, and controls the refractive index of the third dielectric layer 43 to be equal to the refractive index of the first dielectric layer 41, so that the light of the light-emitting element 30 is collimated and emitted from the light-emitting surface. It can be understood that a concave structure is formed above the light-emitting layer 32, similar to a concave lens, so that the light is collimated to avoid light scattering and improve the light extraction rate.

[0064] Further reading Figure 1 and Figure 4 , Figure 4 Schematic diagram of light emission of the stretchable display panel in the stretched display state. When the stretchable display panel 100 is in the stretched display state, the control electrode layer 50 controls the refractive index of the second dielectric layer 42 to be equal to the refractive index of the first dielectric layer 41, and controls the refractive index of the third dielectric layer 43 to be greater than the refractive index of the first dielectric layer 41, so that the light of the light-emitting element 30 is scattered out of the light-emitting surface. It can be understood that a convex structure is formed above the light-emitting layer 32, similar to a convex lens, so that the light is diverged and the area coverage of the emitted light is increased.

[0065] Since the stretched portion of the existing stretchable display panel can produce adaptive deformation when stretched, but the light-emitting area does not change, resulting in a decrease in display quality, the present application controls the refractive index of the second medium layer 42 to be equal to the refractive index of the first medium layer 41, and controls the refractive index of the third medium layer 43 to be greater than the refractive index of the first medium layer 41, so that the light of the light-emitting element 30 is scattered out of the light-emitting surface, the area coverage of the emitted light is increased, and the display effect after stretching is improved, thereby improving the display quality of the stretchable display panel 100.

[0066] The present application provides a stretchable display panel 100. The stretchable display panel 100 has a light emitting surface, including a driving substrate 10, a pixel definition layer 20, a light emitting element 30, a dielectric layer 40 and a control electrode layer 50. The dielectric layer 40 includes a first dielectric layer 41, a second dielectric layer 42, a third dielectric layer 43 and a fourth dielectric layer 44. The light emitting element 30 includes an anode electrode 31, a light emitting layer 32 and a cathode electrode 33. The control electrode layer 50 includes a first electrode 51, a second electrode 52 and a third electrode 53. The stretchable display panel 100 controls the dielectric layer 40 by controlling the electrode layer 50, so that the control electrode layer 50 controls the refractive index of the dielectric layer 40; when the stretchable display panel 100 is in a non-stretched display state, the control electrode layer 50 controls the refractive index of the second dielectric layer 42 to be greater than the refractive index of the first dielectric layer 41, and controls the refractive index of the third dielectric layer 43 to be equal to the refractive index of the first dielectric layer 41, so that the light of the light-emitting element 30 is collimated and emitted from the light-emitting surface, thereby improving the light extraction rate; in the stretched display state, the control electrode layer 50 controls the refractive index of the second dielectric layer 42 to be equal to the refractive index of the first dielectric layer 41, and controls the refractive index of the third dielectric layer 43 to be greater than the refractive index of the first dielectric layer 41, so that the light of the light-emitting element 30 is scattered from the light-emitting surface and further scattered, thereby increasing the area coverage of the emitted light and improving the display effect after stretching, thereby improving the display quality of the stretchable display panel 100.

[0067] It will be apparent to those skilled in the art that the present application is not limited to the details of the exemplary embodiments described above, and that the present application can be implemented in other specific forms without departing from the spirit or essential features of the present application. Therefore, the embodiments should be considered exemplary and non-limiting in all respects, and the scope of the present application is defined by the appended claims rather than the above description, and it is intended that all changes within the meaning and scope of the equivalent elements of the claims be included in the present application. Any reference numeral in a claim should not be considered as limiting the claim to which it relates.

[0068] The above description is only an implementation method of the present application, and does not limit the patent scope of the present application. Any equivalent structure or equivalent process transformation made using the contents of the present application specification and drawings, or directly or indirectly used in other related technical fields, are also included in the patent protection scope of the present application.

Claims

1. A stretchable display panel having a light emitting surface, characterized in that: include: Driver substrate; A pixel definition layer, disposed on one side of the driving substrate, wherein the pixel definition layer has a plurality of openings; A light emitting element is disposed in the opening; The light emitting surface is a surface of the light emitting element that is away from the driving substrate; A dielectric layer is disposed on a side of the light emitting element away from the driving substrate; wherein the dielectric layer includes a first dielectric layer, a second dielectric layer, a third dielectric layer and a fourth dielectric layer; The first dielectric layer is disposed on a side of the light emitting element away from the driving substrate, and a surface of the first dielectric layer on a side away from the light emitting element has a groove; The second dielectric layer is disposed on a side of the first dielectric layer away from the driving substrate, and a portion of the second dielectric layer is disposed in the groove; a projection of the groove on the driving substrate is located within a projection of the light emitting element on the driving substrate; The third dielectric layer is disposed on a side of the second dielectric layer away from the drive substrate, and the third dielectric layer has a protrusion protruding from the side of the second dielectric layer away from the drive substrate, and a projection of the protrusion on the drive substrate is located within a projection of the light emitting element on the drive substrate; The fourth dielectric layer is disposed on a side of the third dielectric layer away from the driving substrate, and the fourth dielectric layer covers the third dielectric layer; The stretchable display panel further includes: a control electrode layer, the control electrode layer comprising a first electrode disposed between the first dielectric layer and the second dielectric layer, a second electrode disposed between the second dielectric layer and the third dielectric layer, and a third electrode disposed between the third dielectric layer and the fourth dielectric layer; Wherein, when the stretchable display panel is not in use, the refractive indexes of the first medium layer and the fourth medium layer are the same, and the refractive index of the second medium layer is less than the refractive index of the third medium layer; the control electrode layer is used to control the refractive index of the medium layer; wherein the first electrode and the second electrode are used to control the refractive index of the second medium layer, and the second electrode and the third electrode are used to control the refractive index of the third medium layer; Wherein, when the stretchable display panel is in a non-stretched display state, the control electrode layer controls the refractive index of the second medium layer to be greater than the refractive index of the first medium layer, and controls the refractive index of the third medium layer to be equal to the refractive index of the first medium layer, so that the light of the light-emitting element is collimated and emitted from the light-emitting surface; When the stretchable display panel is in a stretched display state, the control electrode layer controls the refractive index of the second medium layer to be equal to the refractive index of the first medium layer, and controls the refractive index of the third medium layer to be greater than the refractive index of the first medium layer, so that the light of the light-emitting element is scattered out of the light-emitting surface.

2. The stretchable display panel according to claim 1, characterized in that: The light emitting element comprises: an anode electrode, disposed on one side of the driving substrate; A light-emitting layer is arranged on a side of the anode electrode away from the driving substrate; The cathode electrode is arranged on a side of the light emitting layer away from the driving substrate.

3. The stretchable display panel according to claim 2, characterized in that: The second dielectric layer comprises a recessed portion and a first extension portion; wherein the recessed portion is a portion of the second dielectric layer disposed in the groove, and the first extension portion is a remaining portion of the second dielectric layer after removing the recessed portion; The third dielectric layer includes the protruding portion and a second extending portion; wherein the protruding portion is a portion of the third dielectric layer protruding from a side of the second dielectric layer away from the drive substrate, and the second extending portion is a remaining portion of the third dielectric layer minus the protruding portion; The projection of the recessed portion on the driving substrate is located within the projection of the light-emitting layer on the driving substrate; the projection of the raised portion on the driving substrate is located within the projection of the light-emitting layer on the driving substrate; and the first extending portion and the second extending portion are used for stretching.

4. The stretchable display panel according to claim 1, characterized in that: The cross-sectional shape of the groove is semi-elliptical, and the cross-sectional shape of the side wall surface of the groove is arc-shaped; the surface of one side of the concave portion close to the driving substrate is an arc surface; A surface of the protrusion away from the second dielectric layer is an arc surface.

5. The stretchable display panel according to claim 1, characterized in that: The second dielectric layer and the third dielectric layer are both made of materials having a Pockels effect; or, The second dielectric layer and the third dielectric layer are both made of materials having Kerr effect.

6. The stretchable display panel according to claim 4, characterized in that: The material of the second dielectric layer and the third dielectric layer includes at least one of lithium niobate, lithium tantalate, barium borate and gallium arsenide, or the material of the second dielectric layer and the third dielectric layer is a non-centrosymmetric material.

7. The stretchable display panel according to claim 1, characterized in that: The first electrode is in direct contact with the cathode electrode; or, The first electrode and the cathode electrode are not in direct contact, and a first dielectric layer separates the first electrode from the cathode electrode.

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