Display panel, preparation method thereof and display device

Abstract

A display panel having a central area and a peripheral area (ZB), the display panel comprising: a display backplane (10); the packaging layer group (4) is arranged on the light emitting side of the display backboard (10), the packaging layer group (4) comprises a first film layer (41) and a second film layer (42), the second film layer (42) is arranged on the side, away from the display backboard (10), of the first film layer (41), the refractive index of the second film layer (42) is larger than that of the first film layer (41), and in the peripheral area (ZB), a first protruding structure (411) is formed on the first film layer (41); the light adjusting layer (5) is arranged on the side, away from the display backboard (10), of the packaging layer set (4), and a second protruding structure (51) is arranged on the light adjusting layer (5). The planarization layer (6) is arranged on the side, away from the display backboard (10), of the light adjusting layer (5), and the refractive index of the planarization layer (6) is smaller than that of the light adjusting layer (5).

Description

Display panel and manufacturing method thereof, and display device Technical Field

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

[0002] OLED (Organic Electroluminescence Display) display panels can meet consumers' new demands for display technology due to their many advantages such as high brightness, low power consumption, fast response, high clarity, good flexibility and high luminous efficiency.

[0003] However, as consumers have increasingly higher requirements for display products, current display panels are prone to whitening defects around their periphery, which cannot meet consumers' requirements.

[0004] 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 disclosure, and therefore may include information that does not constitute prior art known to ordinary technicians in the field.

[0005] Summary of the Invention

[0006] The purpose of the present disclosure is to overcome the above-mentioned deficiencies of the prior art and to provide a display panel and a manufacturing method thereof, and a display device.

[0007] According to one aspect of the present disclosure, a display panel is provided, comprising a display area, the display area including a central area and a peripheral area surrounding the central area, the display panel comprising:

[0008] Display back panel;

[0009] an encapsulation layer group, disposed on the light-emitting side of the display backplane, the encapsulation layer group comprising a first film layer and a second film layer, the second film layer being disposed on a side of the first film layer facing away from the display backplane, the refractive index of the second film layer being greater than the refractive index of the first film layer, and a first protruding structure being formed on the first film layer in the peripheral region;

[0010] a light adjustment layer, disposed on a side of the encapsulation layer group facing away from the display backplane, the light adjustment layer being provided with a second protruding structure, wherein an orthographic projection of the second protruding structure on the display backplane at least partially overlaps with an orthographic projection of the first protruding structure on the display backplane;

[0011] A planarization layer is provided on the side of the light adjustment layer away from the display back panel. A groove matching the second protruding structure is provided on the side of the planarization layer close to the light adjustment layer. The second protruding structure is located in the groove. The refractive index of the planarization layer is less than the refractive index of the light adjustment layer.

[0012] In an exemplary embodiment of the present disclosure, the display panel further includes:

[0013] The cover plate is provided on a side of the light regulating layer away from the display back plate. The cover plate is the planarization layer. The groove is provided on a side of the cover plate close to the light regulating layer.

[0014] In an exemplary embodiment of the present disclosure, the display panel further includes:

[0015] a first adhesive layer, provided on a side of the light regulating layer facing away from the display backplane, the first adhesive layer being the planarization layer, and the groove being provided on a side of the first adhesive layer close to the light regulating layer;

[0016] The cover plate is bonded to a side of the first adhesive layer facing away from the display back plate.

[0017] In an exemplary embodiment of the present disclosure, the refractive index of the cover plate is less than or equal to the refractive index of the first adhesive layer.

[0018] In an exemplary embodiment of the present disclosure, the display panel further includes:

[0019] A touch layer group is arranged on the side of the encapsulation layer group away from the display backplane, the touch layer group includes a first insulating layer, a first touch layer, a second insulating layer, a second touch layer and a third insulating layer stacked in sequence, the light adjustment layer is one of the first insulating layer, the second insulating layer or the third insulating layer, and / or the planarization layer is one of the first insulating layer, the second insulating layer or the third insulating layer.

[0020] In an exemplary embodiment of the present disclosure, the refractive index of the light adjustment layer is equal to or less than the refractive index of the second film layer.

[0021] In an exemplary embodiment of the present disclosure, the orthographic projection of the first protruding structure on the display backplane is located within the orthographic projection of the second protruding structure on the display backplane.

[0022] In an exemplary embodiment of the present disclosure, the first protruding structure is arranged in a circle surrounding the central area, and the second protruding structure and the groove are arranged in a circle surrounding the central area.

[0023] In an exemplary embodiment of the present disclosure, the second protruding structure includes at least one protruding ring surrounding the central area, and a surface of the protruding ring facing away from the display back plate includes one or both of a curved surface and a sloped surface.

[0024] In an exemplary embodiment of the present disclosure, the height of the convex ring in a first direction decreases as the number of the convex rings included in the second protruding structure increases, and the first direction is perpendicular to a surface of the display backplane where the encapsulation layer group is provided.

[0025] In an exemplary embodiment of the present disclosure, when the second protruding structure includes one protruding ring, the height of the protruding ring in the first direction is greater than or equal to 3 micrometers and less than or equal to 6 micrometers.

[0026] In an exemplary embodiment of the present disclosure, when the second protruding structure includes three protruding rings, the height of the protruding rings in the first direction is greater than or equal to 2 micrometers and less than or equal to 3 micrometers.

[0027] In an exemplary embodiment of the present disclosure, in the second direction, the maximum ring width of the convex ring is greater than or equal to 3 microns and less than or equal to 5 microns, and the second direction is parallel to a surface of the display backplane where the encapsulation layer group is provided.

[0028] In an exemplary embodiment of the present disclosure, the encapsulation layer group includes:

[0029] A first inorganic layer is provided on the light-emitting side of the display backplane;

[0030] an organic layer, provided on a side of the first inorganic layer away from the display backplane, the organic layer being the first film layer;

[0031] The second inorganic layer is provided on a side of the organic layer away from the display backplane, and the second inorganic layer is the second film layer.

[0032] According to another aspect of the present disclosure, a method for manufacturing a display panel is provided. The display panel has a display area, wherein the display area includes a central area and a peripheral area surrounding the central area. The method includes:

[0033] Provide display backplane;

[0034] An encapsulation layer group is formed on the light-emitting side of the display backplane, the encapsulation layer group including a first film layer and a second film layer, the second film layer being provided on a side of the first film layer facing away from the display backplane, the refractive index of the second film layer being greater than the refractive index of the first film layer, and a first protruding structure being formed on the first film layer in the peripheral region;

[0035] forming a light adjustment layer and a planarization layer in sequence on a side of the encapsulation layer group away from the display backplane;

[0036] In which, a second protruding structure is provided on the light adjustment layer, and the orthographic projection of the second protruding structure on the display back panel at least partially overlaps with the orthographic projection of the first protruding structure on the display back panel; the flattening layer is provided with a groove matching the second protruding structure on a side close to the light adjustment layer, and the second protruding structure is located in the groove, and the refractive index of the flattening layer is smaller than the refractive index of the light adjustment layer.

[0037] In an exemplary embodiment of the present disclosure, the display panel further includes a cover plate; a light adjustment layer and a planarization layer are sequentially formed on a side of the encapsulation layer group facing away from the display back plate, including:

[0038] The planarization layer is the cover plate, and a groove is formed on the cover plate;

[0039] A light regulating material layer is formed on the side of the encapsulation layer group away from the display backplane, and the side of the cover plate with the groove is attached to the light regulating material layer, so that the light regulating material layer forms the light regulating layer.

[0040] In an exemplary embodiment of the present disclosure, a light adjustment layer and a planarization layer are sequentially formed on a side of the encapsulation layer group facing away from the display backplane, including:

[0041] forming a light regulating material layer on a side of the encapsulation layer group facing away from the display backplane, and patterning the light regulating material layer to form the light regulating layer;

[0042] forming a first adhesive layer on a side of the light regulating layer away from the display backplane, so that the groove is formed on a side of the first adhesive layer close to the light regulating layer, wherein the first adhesive layer serves as the planarization layer;

[0043] A cover plate is bonded to a side of the first adhesive layer facing away from the display back plate.

[0044] According to another aspect of the present disclosure, a display device is provided, comprising: a display panel as described above.

[0045] It is to be understood that the foregoing general description and the following detailed description are exemplary and explanatory only and are not restrictive of the disclosure. BRIEF DESCRIPTION OF THE DRAWINGS

[0046] The accompanying drawings are incorporated into and constitute a part of the specification, illustrate embodiments consistent with the present disclosure, and together with the specification, are used to explain the principles of the present disclosure. Obviously, the drawings described below are only some embodiments of the present disclosure, and those skilled in the art can derive other drawings based on these drawings without inventive effort.

[0047] FIG. 1 is a schematic diagram showing the principle structure of a display panel that produces a whitening defect in the related art.

[0048] FIG2 is a schematic structural diagram of a first exemplary embodiment of a display panel according to the present disclosure.

[0049] FIG3 is a schematic structural diagram of the display panel area division according to the present disclosure.

[0050] FIG4 is a schematic structural diagram of another exemplary embodiment of a display panel according to the present disclosure.

[0051] FIG5 is a schematic structural diagram of a second exemplary embodiment of a display panel according to the present disclosure.

[0052] FIG6 is a schematic structural diagram of a third exemplary embodiment of a display panel according to the present disclosure.

[0053] FIG. 7 is a schematic structural diagram of a fourth exemplary embodiment of a display panel according to the present disclosure.

[0054] FIG8 is a schematic structural diagram of a fifth exemplary embodiment of a display panel according to the present disclosure.

[0055] FIG9 is a schematic structural diagram of a sixth exemplary embodiment of a display panel according to the present disclosure.

[0056] FIG10 is a schematic structural diagram of a seventh exemplary embodiment of a display panel according to the present disclosure.

[0057] FIG. 11 is a schematic structural diagram of an eighth exemplary embodiment of a display panel according to the present disclosure.

[0058] FIG. 12 is a schematic structural diagram of a ninth exemplary embodiment of a display panel according to the present disclosure.

[0059] FIG13 is a schematic structural diagram of a tenth exemplary embodiment of a display panel according to the present disclosure.

[0060] FIG. 14 is a schematic structural diagram of an eleventh exemplary embodiment of a display panel according to the present disclosure.

[0061] FIG15 is a schematic flow chart of an exemplary embodiment of a method for manufacturing a display panel according to the present disclosure.

[0062] 16 to 19 are schematic structural diagrams of various steps of the method for manufacturing a display panel disclosed herein.

[0063] Explanation of the accompanying symbols: 10. Display backplane; 1. Base substrate; 2. Driving substrate; 21. Light shielding layer; 22. Buffer layer; 231. Channel portion; 232. Source connection portion; 233. Drain connection portion; 24. Gate insulating layer; 25. Gate layer; 251. Gate; 26. Interlayer dielectric layer; 27. First connecting conductor layer; 271. Source; 272. Drain; 28. First planarization layer; 3. Light-emitting substrate; 31. First electrode; 32. Pixel definition layer; 33. Light-emitting layer group; 34. Second electrode; 35. Sub-pixel; 4. Encapsulation layer group; 41. First film layer; 411. First protruding structure; 42. Second film layer; 421. Third protruding structure; 43. First inorganic layer; 44. Organic layer; 45. Second inorganic layer; 5. Light adjustment layer; 51. Second protruding structure; 511. Protruding ring; 6. Planarization layer; 61. Groove; 71. First adhesive layer; 72. Cover plate; 72a. Motherboard; 8. Touch panel assembly; 81. First insulating layer; 82. First touch layer; 83. Second insulating layer; 84. Second touch layer; 85. Third insulating layer. 9. Photoresist; 100. Mask; 101. Light-shielding portion; 102. Light-transmitting portion; AA, display area; ZX, center area; ZB, peripheral area; NA, non-display area; Z, first direction; X, second direction. DETAILED DESCRIPTION

[0064] Example embodiments will now be described more fully with reference to the accompanying drawings. However, the example embodiments can be implemented in many forms and should not be construed as limited to the embodiments set forth herein; rather, these embodiments are provided so that this disclosure will be thorough and complete and will fully convey the concepts of the example embodiments to those skilled in the art. Like reference numerals in the figures represent identical or similar structures, and thus their detailed descriptions will be omitted. Furthermore, the figures are merely schematic illustrations of the present disclosure and are not necessarily drawn to scale.

[0065] Although relative terms such as "upper" and "lower" are used in this specification to describe the relationship of one illustrated component to another, these terms are used herein for convenience only, such as in accordance with the orientation of the illustrations in the accompanying drawings. It will be understood that if the illustrated device were flipped upside down, the component described as "upper" would become the component "lower." When a structure is referred to as "on" another structure, this may mean that the structure is integrally formed with the other structure, that the structure is "directly" disposed on the other structure, or that the structure is "indirectly" disposed on the other structure via the other structure.

[0066] The terms "a", "an", "the", "said" and "at least one" are used to indicate the presence of one or more elements / components / etc.; the terms "including" and "having" are used to express open-ended inclusion and mean that additional elements / components / etc. may be present in addition to the listed elements / components / etc.; the terms "first", "second" and "third" etc. are used only as labels and are not intended to limit the quantity of their objects.

[0067] In this application, unless otherwise specified or limited, the term "connected" should be understood broadly. For example, "connected" can mean fixed, removable, or integrated; it can be directly connected or indirectly connected through an intermediary. "And / or" simply describes the relationship between related objects, indicating that three possible relationships exist. For example, "A and / or B" can mean: A exists alone, A and B exist simultaneously, or B exists alone. Furthermore, the character " / " in this document generally indicates that the related objects are in an "or" relationship.

[0068] 1 , the inventors found that the main reason why the periphery of the display panel is prone to whitening is that an encapsulation layer group 4 is provided on the light-emitting side of the display backplane 10. The encapsulation layer group 4 may include a first film layer 41 and a second film layer 42. In the peripheral area ZB, the first film layer 41 is formed with a first protruding structure 411, and the second film layer 42 is provided on the side of the first film layer 41 away from the display backplane 10, so that the second film layer 42 is also formed with a protruding structure on the side of the first protruding structure 411 away from the display backplane 10; in the peripheral area ZB, the light emitted from each sub-pixel 35 will hit the first protruding structure 411, and the second film layer 42 is provided with a protruding structure. The refractive index is greater than that of the first film layer 41. When light is incident from the first protruding structure 411 into the second film layer 42, it will be refracted at the interface between the first protruding structure 411 and the second film layer 42, and the refraction angle of the light is smaller than the incident angle, so that the light is refracted toward the middle of the first protruding structure 411, that is, the light is converged. Moreover, the degree of convergence of the light at the first protruding structure 411 is inconsistent with the degree of convergence of the light at other positions of the display panel, thereby increasing the intensity of the light emitted through the first protruding structure 411, that is, making the light more concentrated at the position of the first protruding structure 411, resulting in a whitening defect.

[0069] The exemplary embodiments of the present disclosure provide a display panel, as shown in FIG2-FIG11, wherein the display panel has a display area AA, and the display area AA may include a central area ZX and a peripheral area ZB arranged around the central area ZX. The display panel may include a display backplane 10, an encapsulation layer group 4, a light adjustment layer 5, and a flattening layer 6; the encapsulation layer group 4 is arranged on the light-emitting side of the display backplane 10, and the encapsulation layer group 4 may include a first film layer 41 and a second film layer 42, wherein the second film layer 42 is arranged on a side of the first film layer 41 away from the display backplane 10, and the refractive index of the second film layer 42 is greater than the refractive index of the first film layer 41. B. The first film layer 41 forms a first protruding structure 411; the light adjustment layer 5 is arranged on the side of the encapsulation layer group 4 away from the display back panel 10, and a second protruding structure 51 is arranged on the light adjustment layer 5. The orthographic projection of the second protruding structure 51 on the display back panel 10 at least partially overlaps with the orthographic projection of the first protruding structure 411 on the display back panel 10; the flattening layer 6 is arranged on the side of the light adjustment layer 5 away from the display back panel 10, and a groove 61 matching the second protruding structure 51 is provided on the side of the flattening layer 6 close to the light adjustment layer 5. The second protruding structure 51 is located in the groove 61, and the refractive index of the flattening layer 6 is less than the refractive index of the light adjustment layer 5.

[0070] In the display panel disclosed herein, the refractive index of the planarization layer 6 is smaller than that of the light adjustment layer 5. Relatively speaking, the light adjustment layer 5 is a light-dense medium, and the planarization layer 6 is a light-sparse medium. The light emitted from the second film layer 42 and then emitted from the light adjustment layer 5 to the planarization layer 6 is from a light-dense medium to a light-sparse medium, which will produce refraction at the interface between the light adjustment layer 5 and the planarization layer 6, and the refraction angle of the light is greater than the incident angle of the light, that is, the light is deflected in the direction away from the normal, and the degree of diffusion of the light at the second protruding structure 51 is inconsistent with the degree of diffusion of the light at other positions of the display panel, so that the light emitted through the second protruding structure 51 and the planarization layer 6 is more dispersed, thereby reducing or avoiding the whitening defect.

[0071] As shown in Figure 3 , the display panel may include a display area AA for displaying images and a non-display area NA for not displaying images. Display and touch functions can be implemented in the display area AA. The non-display area NA may be arranged to surround the display area AA. The display area AA may include a central area ZX and a peripheral area ZB surrounding the central area ZX. That is, both the central area ZX and the peripheral area ZB can implement display and touch functions, with the peripheral area ZB located between the central area ZX and the non-display area NA.

[0072] The display backplane 10 can be an OLED (Organic Electroluminescence Display) display backplane, a QLED (Quantum Dot Light Emitting Diodes) display backplane, etc. The display backplane has a light-emitting side and a non-light-emitting side, and the light-emitting side and the non-light-emitting side are arranged opposite to each other. The light-emitting side can display a picture, and the side that displays the picture is the display surface.

[0073] The following description will be made by taking the OLED display backplane 10 as an example.

[0074] In this example embodiment, as shown in FIG4 , the display backplane 10 may include a base substrate 1. The material of the base substrate 1 may include an inorganic material, such as glass, quartz, or metal. The material of the base substrate 1 may also include an organic material, such as polyimide, polycarbonate, polyacrylate, polyetherimide, polyethersulfone, polyethylene terephthalate, and polyethylene naphthalate. The base substrate 1 may be formed by multiple layers of material, such as the base substrate 1 may include multiple base material layers, and the material of the base material layer may be any of the materials mentioned above. Of course, the base substrate 1 may also be set as a single layer, and may be any of the materials mentioned above.

[0075] 4 , the display backplane 10 may further include a driving substrate 2 and a light-emitting substrate 3. The driving substrate 2 is disposed on one side of the base substrate 1, and the light-emitting substrate 3 is disposed on a side of the driving substrate 2 facing away from the base substrate 1. The driving substrate 2 may include a plurality of driving circuits arranged in an array, and the light-emitting substrate 3 may include a plurality of light-emitting devices arranged in an array. The driving circuits may drive the light-emitting devices to emit light.

[0076] Specifically, as shown in FIG4 , a light shielding layer 21 can be provided on one side of the base substrate 1. Light incident from the base substrate 1 into the active layer generates photogenerated carriers in the active layer, significantly affecting the characteristics of the thin-film transistor and ultimately the image quality of the display device. The light shielding layer 21 can block light incident from the base substrate 1, thereby preventing it from affecting the characteristics of the thin-film transistor and thus the image quality of the display device. Depending on the type of thin-film transistor, the light shielding layer 21 may be omitted.

[0077] A buffer layer 22 may also be formed on the side of the light-shielding layer 21 facing away from the base substrate 1. The buffer layer 22 serves to block moisture and impurity ions in the base substrate 1 (especially the organic material) and to increase hydrogen ions for the subsequently formed active layer. The buffer layer 22 is made of an insulating material and can insulate and isolate the light-shielding layer 21 from the active layer. The buffer layer 22 may include silicon nitride, silicon oxide, or silicon oxynitride. Depending on the type of base substrate 1 or process conditions, the buffer layer 22 may be omitted.

[0078] An active layer is provided on the side of the buffer layer 22 facing away from the base substrate 1. The active layer may include a channel portion 231 and conductor portions provided at both ends of the channel portion 231. One of the two conductor portions is a source connection portion 232, and the other is a drain connection portion 233. A gate insulating layer 24 is provided on the side of the active layer facing away from the base substrate 1. A gate layer 25 is provided on the side of the gate insulating layer 24 facing away from the base substrate 1. The gate layer 25 may include a gate electrode 251 and a gate line (not shown in the figure).

[0079] An interlayer dielectric layer 26 is provided on the side of the gate layer 25 facing away from the base substrate 1, and a via is provided on the interlayer dielectric layer 26, which is connected to the source connection part 232 and the drain connection part 233; a first connecting conductor layer 27 is provided on the side of the interlayer dielectric layer 26 facing away from the base substrate 1, and the first connecting conductor layer 27 may include a source 271, a drain 272 and a data line (not shown in the figure), and the data line can be connected to the source 271, or it can be a part of the data line as the source 271; the source 271 is connected to the source connection part 232 through the via on the interlayer dielectric layer 26, and the drain 272 is connected to the drain connection part 233 through the via on the interlayer dielectric layer 26.

[0080] In some other exemplary embodiments of the present disclosure, a passivation layer is provided on the side of the first connecting conductor layer 27 facing away from the base substrate 1, and a via is also provided in the passivation layer. A second connecting conductor layer is provided on the side of the passivation layer facing away from the base substrate 1. The second connecting conductor layer may include a second source electrode and / or a second drain electrode, and the second source electrode and the second drain electrode are connected to the source electrode 271 and the drain electrode 272 respectively through the vias in the passivation layer. Of course, a third connecting conductor layer, a fourth connecting conductor layer, and so on may also be provided as needed.

[0081] 4 , a first planarization layer 28 is provided on the side of the first connection conductor layer 27 facing away from the substrate 1. A via is provided on the first planarization layer 28, and the via is connected to the drain 272. The channel portion 231, the gate 251, the source 271, and the drain 272 form a thin film transistor.

[0082] It should be noted that the thin film transistors described in this specification are top-gate thin film transistors. In other exemplary embodiments of the present disclosure, the thin film transistors may also be bottom-gate or dual-gate thin film transistors, and their specific structures are not described in detail here. Moreover, when using thin film transistors with opposite polarities or when the current direction changes during circuit operation, the functions of the "source 271" and "drain 272" are sometimes interchangeable. Therefore, in this specification, the "source 271" and "drain 272" may be interchangeable.

[0083] 4 , a light-emitting substrate 3 is provided on the side of the first planarization layer 28 facing away from the base substrate 1 . The light-emitting substrate 3 may include a first electrode 31 , a pixel definition layer 32 , a light-emitting layer group 33 and a second electrode 34 .

[0084] Specifically, a first electrode 31 is provided on the side of the first planarization layer 28 facing away from the base substrate 1 . The first electrode 31 is connected to the drain 272 of the driving backplane through a hole. The driving signal is provided to the first electrode 31 through the drain 272 . The first electrode 31 can be an anode (pixel electrode).

[0085] A pixel definition layer 32 is provided on the side of the first electrode 31 facing away from the base substrate 1 . An opening is provided on the pixel definition layer 32 , which is connected to the first electrode 31 , so that at least part of the first electrode 31 is not covered by the pixel definition layer 32 .

[0086] A light-emitting layer group 33 is disposed on the side of the pixel definition layer 32 facing away from the substrate 1, with at least a portion of the light-emitting layer group 33 located within the opening. A second electrode 34 is disposed on the side of the light-emitting layer group 33 facing away from the substrate 1. The second electrode 34 can be a cathode (common electrode). The light-emitting layer group 33 within an opening emits light to form a sub-pixel 35, such that the orthographic projection of the sub-pixel 35 on the substrate 1 is the orthographic projection of the light-emitting layer group 33 within the opening on the substrate 1. The display backplane 10 can include multiple sub-pixels 35.

[0087] The light-emitting layer group 33 may include a hole injection layer, a hole transport layer, an organic light-emitting layer, an electron transport layer, and an electron injection layer stacked in sequence. The hole injection layer is in contact with the first electrode 31, and the electron injection layer is in contact with the second electrode 34. Of course, in other exemplary embodiments of the present disclosure, the light-emitting layer group 33 may include only the hole transport layer, the light-emitting layer, and the electron transport layer. The light-emitting layer group 33 may also have other structures, and its specific structure can be set as needed.

[0088] Holes are injected into the organic light-emitting layer from the first electrode 31 side, and electrons are injected into the organic light-emitting layer from the second electrode 34 side. Eventually, the holes and electrons recombine in the organic light-emitting layer to generate excitons. When the generated excitons relax from the excited state to the ground state, the OLED emits visible light.

[0089] In this exemplary embodiment, as shown in FIG. 2 , an encapsulation layer group 4 is provided on the light-emitting side of the display backplane 10 . Specifically, an encapsulation layer group 4 is provided on the side of the second electrode 34 facing away from the base substrate 1 .

[0090] The encapsulation layer group 4 may include a first film layer 41 and a second film layer 42. The second film layer 42 is disposed on the side of the first film layer 41 facing away from the display backplane 10. For example, the encapsulation layer group 4 may include a first inorganic layer 43, an organic layer 44, and a second inorganic layer 45. The first inorganic layer 43 is disposed on the light-emitting side of the display backplane 10. The first inorganic layer 43 may be made of silicon nitride (SiNx) or silicon oxynitride (SiNO), etc. The first inorganic layer 43 may be formed by chemical vapor deposition (CVD) on the side of the second electrode 34 facing away from the base substrate 1.

[0091] The organic layer 44 is arranged on the side of the first inorganic layer 43 away from the display back panel 10. The organic layer 44 can be the first film layer 41; the material of the organic layer 44 can be acrylic, epoxy or silicon oxide, etc. The refractive index of the organic layer 44 is greater than or equal to 1.40 and less than or equal to 1.55. For example, the refractive index of the organic layer 44 can be 1.43, 1.45, 1.47, 1.5, 1.52, etc.

[0092] The organic layer 44 can be formed on the side of the first inorganic layer 43 away from the display backplane 10 by inkjet printing (IJP), so that the organic layer 44 is initially in a liquid state when it is formed on the side of the first inorganic layer 43 away from the display backplane 10. The liquid organic layer material has a certain fluidity. In order to prevent the liquid organic layer material from flowing to other areas and affecting the thickness and shape of the finally formed organic layer 44, a retaining wall structure can be set at the position where the organic layer 44 needs to be cut off. The retaining wall structure can prevent the liquid organic layer material from flowing to other areas, thereby ensuring the thickness and shape of the later formed organic layer 44. However, after the liquid organic layer material flows into the retaining wall structure, it will produce a certain amount of backflow. The backflowing organic layer material overlaps with the original organic layer material, resulting in the formation of a first protruding structure 411 in the organic layer 44 in the peripheral region ZB. That is, the first film layer 41 forms a first protruding structure 411, and the first protruding structure 411 protrudes toward the side away from the display backplane 10. Because the peripheral region ZB is part of the display area AA, the orthographic projection of the first protruding structure 411 on the base substrate 1 overlaps with the orthographic projection of the sub-pixels 35 in the peripheral region ZB on the base substrate 1. Moreover, in the non-display area NA, the thickness of the organic layer 44 decreases with increasing distance from the display area AA, that is, the thickness of the organic layer 44 decreases the further away from the display area AA.

[0093] The second inorganic layer 45 is disposed on the side of the organic layer 44 facing away from the display backplane 10. The material of the second inorganic layer 45 can be silicon nitride (SiNx) or silicon oxynitride (SiNO), etc. The second inorganic layer 45 can be formed by chemical vapor deposition (CVD) on the side of the organic layer 44 facing away from the display backplane 10. The second inorganic layer 45 completely covers the organic layer 44. However, the second inorganic layer 45 is too thin to provide a planarization effect, so that the second inorganic layer 45 forms a third protrusion structure on the side of the first protrusion structure 411 facing away from the display backplane 10.

[0094] The refractive index of the second inorganic layer 45 is greater than or equal to 1.70 and less than or equal to 1.85. For example, the refractive index of the second inorganic layer 45 may be 1.73, 1.75, 1.77, 1.8, 1.82, etc. The refractive index of the second inorganic layer 45 is greater than that of the organic layer 44 . The second inorganic layer 45 can be a second film layer 42, that is, the refractive index of the second film layer 42 is greater than the refractive index of the first film layer 41. Relatively speaking, the second film layer 42 is an optically dense medium, and the first film layer 41 is an optically sparse medium. The light emitted from the sub-pixel 35 is emitted from the first film layer 41 to the second film layer 42, which is from an optically sparse medium to an optically dense medium. It will be refracted at the interface between the first film layer 41 and the second film layer 42, and the incident angle of the light is greater than the refraction angle of the light, that is, the light is deflected toward the normal direction, and the degree of convergence of the light at the first protruding structure 411 is inconsistent with the degree of convergence of the light at other positions of the display panel, that is, the light is refracted toward the middle of the first protruding structure 411, so that the intensity of the light emitted through the first protruding structure 411 is increased, that is, the light is more concentrated at the position of the first protruding structure 411, resulting in a whitening defect.

[0095] Of course, in some other example embodiments of the present disclosure, the encapsulation layer group 4 may include only the organic layer 44 and the second inorganic layer 45; the encapsulation layer group 4 may also be set to four layers or five layers. For example, the encapsulation layer group 4 may also include a third inorganic layer arranged on the side of the second inorganic layer 45 away from the display backplane 10, or a third inorganic layer may be arranged between the first inorganic layer 43 and the display backplane 10.

[0096] In this example embodiment, as shown in Figures 2 and 5 to 11, a light adjustment layer 5 is provided on the side of the encapsulation layer group 4 away from the display back panel 10, and a second protruding structure 51 is provided on the light adjustment layer 5. The second protruding structure 51 protrudes from other positions of the light adjustment layer 5 in a direction away from the display back panel 10.

[0097] The orthographic projection of the second protrusion structure 51 on the display back panel 10 at least partially overlaps with the orthographic projection of the first protrusion structure 411 on the display back panel 10, so that at least part of the light emitted from the first protrusion structure 411 can be projected onto the second protrusion structure 51. For example, the edge line of the orthographic projection of the first protrusion structure 411 on the display back panel 10 may coincide with the edge line of the orthographic projection of the second protrusion structure 51 on the display back panel 10, so that almost all of the light emitted from the first protrusion structure 411 can be projected onto the second protrusion structure 51. Alternatively, a portion of the orthographic projection of the first protruding structure 411 on the display back panel 10 may overlap with a portion of the orthographic projection of the second protruding structure 51 on the display back panel 10, so that a portion of the light emitted from the first protruding structure 411 can reach the second protruding structure 51; or alternatively, the orthographic projection of the second protruding structure 51 on the display back panel 10 may overlap and be larger than the orthographic projection of the first protruding structure 411 on the display back panel 10, so that almost all of the light emitted from the first protruding structure 411 can reach the second protruding structure 51.

[0098] Moreover, the refractive index of the light adjustment layer 5 is equal to or less than the refractive index of the second film layer 42. The refractive index of the light adjustment layer 5 is greater than or equal to 1.70 and less than or equal to 1.85. For example, the refractive index of the light adjustment layer 5 can be 1.73, 1.75, 1.77, 1.8, 1.82, etc.

[0099] When the refractive index of the light adjustment layer 5 is equal to the refractive index of the second film layer 42, the light will not be refracted at the interface between the light adjustment layer 5 and the second film layer 42, and the whitening defect will not be aggravated; when the refractive index of the light adjustment layer 5 is less than the refractive index of the second film layer 42, the light will be refracted at the interface between the light adjustment layer 5 and the second film layer 42, and the refraction angle is greater than the incident angle, so that the light is diffused to a certain extent, which alleviates the whitening defect.

[0100] A flattening layer 6 is provided on the side of the light adjustment layer 5 facing away from the display back panel 10. A groove 61 matching the second protruding structure 51 is provided on the side of the flattening layer 6 close to the light adjustment layer 5. The second protruding structure 51 is located in the groove 61. The refractive index of the flattening layer 6 is less than the refractive index of the light adjustment layer 5. The refractive index of the flattening layer 6 is greater than or equal to 1.45 and less than or equal to 1.55. For example, the refractive index of the flattening layer 6 can be 1.47, 1.5, 1.53, etc.

[0101] Relatively speaking, the light adjustment layer 5 is a light-dense medium, and the planarization layer 6 is a light-sparse medium. The light emitted from the first protruding structure 411 is emitted from the light adjustment layer 5 to the planarization layer 6, which is from a light-dense medium to a light-sparse medium. It will produce refraction at the interface between the light adjustment layer 5 and the planarization layer 6, and the refraction angle of the light is greater than the incident angle of the light, that is, the light is deflected in the direction away from the normal. Moreover, the degree of diffusion of the light at the second protruding structure 51 is inconsistent with the degree of diffusion of the light at other positions of the display panel, so that the light emitted through the second protruding structure 51 and the planarization layer 6 is more dispersed, thereby reducing or avoiding the whitening defect.

[0102] Furthermore, the side of the planarization layer 6 facing away from the display backplane 10 is flat, preventing the formation of protrusions on the planarization layer 6. If protrusions are formed on the planarization layer 6, and a film layer with a higher refractive index than the planarization layer 6 is formed on the side of the planarization layer 6 facing away from the display backplane 10, the protrusions on the planarization layer 6 will converge light, still resulting in a whitening defect. Avoiding the formation of protrusions on the planarization layer 6 can prevent the whitening defect from occurring again.

[0103] As shown in Figures 2, 5, and 7, in some exemplary embodiments of the present disclosure, the display panel may further include a cover plate 72. The cover plate 72 is disposed on the side of the light adjustment layer 5 facing away from the display backplane 10. The cover plate 72 may be the planarization layer 6. The cover plate 72 is bonded to the light adjustment layer 5. A groove 61 is provided on the side of the cover plate 72 adjacent to the light adjustment layer 5. The cover plate 72 may be made of various types of glass, which are not described here.

[0104] In this case, the material of the light-adjusting layer 5 can be OCA (Optically Clear Adhesive). Of course, the material of the light-adjusting layer 5 can also be PSA (Pressure Sensitive Adhesives). The material of the light-adjusting layer 5 can also be other adhesive materials, which are not described here. The light-adjusting layer 5 not only adjusts the light but also serves to bond the cover plate 72 to the display back plate 10.

[0105] 8-11 , in some example embodiments of the present disclosure, the display panel may further include a first adhesive layer 71 and a cover plate 72 ; the first adhesive layer 71 is disposed on the side of the light adjustment layer 5 facing away from the display back plate 10 , the first adhesive layer 71 may be a planarization layer 6 , and a groove 61 is provided on a side of the first adhesive layer 71 close to the light adjustment layer 5 ; the cover plate 72 is bonded to the side of the first adhesive layer 71 facing away from the display back plate 10 , and the material of the cover plate 72 may be various types of glass, which are not described one by one here.

[0106] In this case, the material of the light adjustment layer 5 may be OC (Organic Compound). Of course, the material of the light adjustment layer 5 may also be other transparent materials whose refractive index meets the requirements.

[0107] The material of the first adhesive layer 71 can be optically clear adhesive (OCA). Of course, the material of the first adhesive layer 71 can also be PSA (Pressure Sensitive Adhesive). The material of the first adhesive layer 71 can also be other adhesive materials, which are not described here. The first adhesive layer 71 not only functions to adjust the light, but also serves to bond the cover plate 72 to the light adjustment layer 5.

[0108] The refractive index of the first adhesive layer 71 is lower than that of the light adjustment layer 5. Relatively speaking, the light adjustment layer 5 is a light-dense medium, and the first adhesive layer 71 is a light-sparse medium. The light emitted from the first protruding structure 411 is emitted from the light adjustment layer 5 to the first adhesive layer 71, which is from a light-dense medium to a light-sparse medium. As a result, the light emission angle is greater than the light incidence angle, and the light is deflected in a direction away from the normal, making the light emitted through the second protruding structure 51 and the first adhesive layer 71 more dispersed, thereby reducing or avoiding the undesirable whitening effect.

[0109] Furthermore, the refractive index of the cover plate 72 may be smaller than that of the light adjustment layer 5 , so that the light emitted from the first adhesive layer 71 to the cover plate 72 will not be re-converged to produce a whitening defect.

[0110] Furthermore, the refractive index of the cover plate 72 is less than or equal to the refractive index of the first adhesive layer 71. When the refractive index of the cover plate 72 is equal to the refractive index of the first adhesive layer 71, light emitted from the second protruding structure 51 will not be refracted at the interface between the first adhesive layer 71 and the cover plate 72, and will be emitted at the original angle, which will not aggravate the whitening problem.

[0111] When the refractive index of the cover plate 72 is lower than that of the first adhesive layer 71 , the first adhesive layer 71 is a light-dense medium and the cover plate 72 is a light-sparse medium. This allows the light emitted from the second protruding structure 51 to pass from the first adhesive layer 71 to the cover plate 72, which is a process of passing from a light-dense medium to a light-sparse medium. This results in the light's exit angle being greater than its incident angle, and the light being deflected away from the normal. This further disperses the light emitted through the first adhesive layer 71 and the cover plate 72, thereby further alleviating or avoiding the undesirable whitening effect.

[0112] In addition, in some other exemplary embodiments of the present disclosure, the cover plate 72 may include more film layers, such as organic film layers and inorganic film layers, and the specific structures are not described here one by one.

[0113] 4 and 14 , in some example embodiments of the present disclosure, the display panel may further include a touch layer group 8, which is disposed on a side of the encapsulation layer group 4 facing away from the display back panel 10, and the light adjustment layer 5 may be one of the first insulating layer 81, the second insulating layer 83, or the third insulating layer 85, or the planarization layer 6 may be one of the first insulating layer 81, the second insulating layer 83, or the third insulating layer 85, or the light adjustment layer 5 may be one of the first insulating layer 81, the second insulating layer 83, or the third insulating layer 85, and the planarization layer 6 may be one of the first insulating layer 81, the second insulating layer 83, or the third insulating layer 85.

[0114] The touch layer group 8 may include a first insulating layer 81, a first touch layer 82, a second insulating layer 83, a second touch layer 84, and a third insulating layer 85, which are stacked in sequence. Specifically, the first insulating layer 81 is disposed on the side of the encapsulation layer group 4 facing away from the display backplane 10, the first touch layer 82 is disposed on the side of the first insulating layer 81 facing away from the display backplane 10, the second insulating layer 83 is disposed on the side of the first touch layer 82 facing away from the display backplane 10, the second touch layer 84 is disposed on the side of the second insulating layer 83 facing away from the display backplane 10, and the third insulating layer 85 is disposed on the side of the second touch layer 84 facing away from the display backplane 10.

[0115] The second touch layer 84 generally serves as a touch function layer, equipped with multiple touch drive electrodes and multiple touch sensing electrodes. The first touch layer 82 generally serves as a bridging layer to connect disconnected touch drive electrodes or touch sensing electrodes. Therefore, the first touch layer 82 has fewer conductive meshes, while the second touch layer 84 has more conductive meshes.

[0116] 14 , the first insulating layer 81 can serve as the light adjustment layer 5 , and the second insulating layer 83 can serve as the planarization layer 6 , which can minimize the impact of the second protruding structure 51 on the light adjustment layer 5 on the touch function.

[0117] Of course, in some other exemplary embodiments of the present disclosure, the third insulating layer 85 may be the light adjustment layer 5, and the planarization layer 6 may be provided on the side of the touch layer group 8 facing away from the display backplane 10. The touch layer group 8 may also be provided on the side of the light adjustment layer 5 facing away from the display backplane 10. In this case, the first insulating layer 81 may be the planarization layer 6.

[0118] 4 , the touch layer assembly 8 may not include the first insulating layer 81. In this case, the second insulating layer 83 may serve as the light adjustment layer 5, and the third insulating layer 85 may serve as the planarization layer 6. Furthermore, the orthographic projection of the conductive mesh of the first touch layer 82 on the base substrate 1 is located within the gap between the orthographic projections of two adjacent sub-pixels 35 on the base substrate 1. The orthographic projection of the conductive mesh of the second touch layer 84 on the base substrate 1 is also located within the gap between the orthographic projections of two adjacent sub-pixels 35 on the base substrate 1. This prevents the first touch layer 82 and the second touch layer 84 from blocking light emitted by the sub-pixels 35.

[0119] In this exemplary embodiment, the first protruding structure 411 can be provided as a circle surrounding the central region ZX, and the second protruding structure 51 and the groove 61 can also be provided as a circle surrounding the central region ZX. This allows almost all light emitted from the first protruding structure 411 to reach the second protruding structure 51, thereby reducing or avoiding the undesirable whitening effect through the second protruding structure 51. Of course, in other exemplary embodiments of the present disclosure, the second protruding structure 51 and the groove 61 can also be provided as a disconnected structure. The length of the disconnected structure can be set as needed. Generally, the shorter the disconnected structure, the better.

[0120] The second protruding structure 51 may include at least one protruding ring 511 surrounding the central region ZX. For example, as shown in Figures 2, 5, 10, and 11, the second protruding structure 51 may include one protruding ring 511 surrounding the central region ZX. As shown in Figures 6 to 9, the second protruding structure 51 may include three protruding rings 511 surrounding the central region ZX. The number of protruding rings 511 may also be two, four, or more.

[0121] The surface of the convex ring 511 facing away from the display back plate 10 may include one or both of a curved surface and an inclined surface. For example, as shown in Figures 2, 6, 8, and 10, the surface of the convex ring 511 facing away from the display back plate 10 may be a curved surface, which may be a circular arc, an elliptical arc, a parabolic arc, etc. The curved surface makes the surface of the convex ring 511 facing away from the display back plate 10 relatively smooth. As shown in Figures 5, 7, 9, and 11, the surface of the convex ring 511 facing away from the display back plate 10 may include two inclined surfaces, and the highest points of the two inclined surfaces are connected, so that the cross-section of the convex ring 511 perpendicular to its extension direction has a triangular shape. As shown in FIG12 , the side of the convex ring 511 facing away from the display back plate 10 may include two inclined surfaces and a circular arc surface, and the highest points of the two inclined surfaces are connected to opposite sides of the circular arc surface, so that the cross-sectional shape of the convex ring 511 perpendicular to its extension direction is basically a triangle, and the vertex angle of the triangle is set as a rounded chamfer; as shown in FIG13 , the side of the convex ring 511 facing away from the display back plate 10 may include two inclined surfaces and a flat surface, and the highest points of the two inclined surfaces are connected to opposite sides of the flat surface, so that the cross-sectional shape of the convex ring 511 perpendicular to its extension direction is basically an isosceles trapezoid. Of course, the side of the convex ring 511 facing away from the display back plate 10 can also have other shapes, which are not described here one by one.

[0122] In this example embodiment, the height of the protruding ring 511 in the first direction Z decreases as the number of protruding rings 511 included in the second protruding structure 51 increases. In other words, the height of the protruding ring 511 in the first direction Z increases as the number of protruding rings 511 included in the second protruding structure 51 decreases. The first direction Z is perpendicular to the side of the display back panel 10 where the encapsulation layer group 4 is set.

[0123] Specifically, when the second protruding structure 51 includes a protruding ring 511, the height of the protruding ring 511 in the first direction Z is greater than or equal to 3 microns and less than or equal to 6 microns. For example, the height of the protruding ring 511 in the first direction Z can be 3.3 microns, 3.5 microns, 3.8 microns, 4 microns, 4.2 microns, 4.5 microns, 4.7 microns, 5 microns, 5.3 microns, 5.5 microns, 5.8 microns, etc.

[0124] When the second protruding structure 51 includes three protruding rings 511 , the height of the protruding rings 511 in the first direction Z is greater than or equal to 2 microns and less than or equal to 3 microns. For example, the height of the protruding rings 511 in the first direction Z can be 2.3 microns, 2.5 microns, 2.8 microns, etc.

[0125] In the second direction X, since the ring width of the second protruding structure 51 is generally a constant value, and in the first direction Z, the height of the protruding ring 511 is also a constant value; if the second protruding structure 51 includes a small number of protruding rings 511, the slope of the protruding ring 511 facing away from the display back plate 10 is relatively gentle, that is, the inclination angle of the protruding ring 511 facing away from the display back plate 10 is small, the light diffusion effect is small, and the problem of peripheral whitening cannot be effectively solved by the second protruding structure 51.

[0126] When the second protruding structure 51 includes a small number of protruding rings 511, the height of the protruding rings 511 is set higher, which can increase the inclination angle of the protruding rings 511 away from the display back panel 10, so that the slope of the protruding rings 511 away from the display back panel 10 is steeper, and the protruding rings 511 have a greater effect on diffusing light, thereby ensuring that the problem of whitening at the periphery can be well solved by the second protruding structure 51.

[0127] In this example embodiment, in the second direction X, the maximum ring width of the raised ring 511 is greater than or equal to 3 microns and less than or equal to 5 microns. For example, the maximum ring width of the raised ring 511 can be 3.3 microns, 3.5 microns, 3.8 microns, 4 microns, 4.2 microns, 4.5 microns, 4.7 microns, etc.

[0128] If the maximum ring width of the protruding ring 511 is set to be smaller, it will be difficult or impossible to achieve with current processes, thereby increasing process difficulty and manufacturing costs.

[0129] Since the ring width of the second protruding structure 51 is generally a fixed value, if the maximum ring width of the protruding ring 511 is set to be larger, the number of protruding rings 511 included in the second protruding structure 51 is smaller, so that the slope of the protruding ring 511 facing away from the display back plate 10 is relatively gentle, that is, the inclination angle of the protruding ring 511 facing away from the display back plate 10 is smaller, the diffusion effect on light is smaller, and the problem of peripheral whitening cannot be effectively solved by the second protruding structure 51.

[0130] The above numerical range not only makes the convex ring 511 have a greater light diffusion effect, so as to ensure that the problem of peripheral whitening can be well solved by the second protruding structure 51 ; but also does not increase the process difficulty and manufacturing cost.

[0131] It should be noted that the second direction X is parallel to the side of the display backplane 10 on which the encapsulation layer group 4 is provided. Therefore, the second direction X is an infinite number of directions, and only one is marked in the figure for illustration. Taking a circular ring as an example, the ring width is obtained by (outer circle radius) - (inner circle radius), that is, the circular ring is equivalent to a hollow circle, and the hollow circle has a smaller inner edge and a larger outer edge, and the distance between the inner edge and the outer edge is the ring width; the ring width of the second protruding structure 51 refers to the distance between the outer edge and the inner edge of the second protruding structure 51, and the ring width of the convex ring 511 refers to the distance between the outer edge and the inner edge of the convex ring 511; the maximum ring width of the convex ring 511 refers to the ring width of the end of the convex ring 511 close to the display backplane 10.

[0132] Based on the same inventive concept, an exemplary embodiment of the present disclosure provides a method for manufacturing a display panel. The display panel has a display area AA. The display area AA may include a central area ZX and a peripheral area ZB surrounding the central area ZX. As shown in FIG. 15 , the manufacturing method may include the following steps:

[0133] Step S10: providing a display back panel.

[0134] In step S20, an encapsulation layer group is formed on the light-emitting side of the display backplane, wherein the encapsulation layer group includes a first film layer and a second film layer. The second film layer is arranged on the side of the first film layer away from the display backplane. The refractive index of the second film layer is greater than the refractive index of the first film layer. In the peripheral area, the first film layer forms a first protruding structure.

[0135] Step S30 , forming a light adjustment layer and a planarization layer in sequence on a side of the encapsulation layer group away from the display backplane.

[0136] Among them, a second protruding structure 51 is provided on the light adjustment layer 5, and the orthographic projection of the second protruding structure 51 on the display back panel 10 at least partially overlaps with the orthographic projection of the first protruding structure 411 on the display back panel 10; the flattening layer 6 is provided with a groove 61 matching the second protruding structure 51 on the side close to the light adjustment layer 5, and the second protruding structure 51 is located in the groove 61, and the refractive index of the flattening layer 6 is less than the refractive index of the light adjustment layer 5.

[0137] The method for preparing the display back plate 10 will not be described in detail here.

[0138] The first inorganic layer 43 may be formed on the light-emitting side of the display backplane 10 by chemical vapor deposition (CVD).

[0139] An organic layer 44 can be formed on the side of the first inorganic layer 43 facing away from the display backplane 10 by inkjet printing (IJP). The newly printed organic layer 44 is in a liquid state, and the liquid organic layer material has a certain degree of fluidity. To prevent the liquid organic layer material from flowing to other areas and affecting the thickness and shape of the organic layer 44 formed in the end, a retaining wall structure can be provided at the position where the organic layer 44 needs to be cut off. The retaining wall structure can prevent the liquid organic layer material from flowing to other areas, thereby ensuring the thickness and shape of the organic layer 44 formed in the end. However, after the liquid organic layer material flows to the retaining wall structure, a certain amount of backflow will occur. The backflowing organic layer material is superimposed on the original organic layer material, so that in the peripheral area ZB, the organic layer 44 forms a first protruding structure 411. The organic layer 44 can be the first film layer 41, that is, the first film layer 41 forms the first protruding structure 411.

[0140] A second inorganic layer 45 can be formed on the side of the organic layer 44 facing away from the display backplane 10 by chemical vapor deposition (CVD). The refractive index of the second inorganic layer 45 is greater than that of the organic layer 44. The second inorganic layer 45 can be the second film layer 42, i.e., the refractive index of the second film layer 42 is greater than that of the first film layer 41. Relatively speaking, the second film layer 42 is an optically denser medium, while the first film layer 41 is an optically sparser medium. Light emitted from the sub-pixel 35 travels from the first film layer 41 to the second film layer 42, meaning it travels from an optically sparser medium to an optically denser medium. This causes the incident angle of the light to be greater than the exit angle of the light, deflecting the light toward the normal, i.e., refracting toward the center of the first protruding structure 411. This increases the intensity of the light emitted through the first protruding structure 411, i.e., the light is more concentrated at the location of the first protruding structure 411, resulting in a whitish appearance.

[0141] When the display panel also includes a cover plate 72, the cover plate 72 can be a planarization layer 6, and the light adjustment layer 5 and the planarization layer 6 are formed in sequence on the side of the encapsulation layer group 4 facing away from the display back plate 10, which may include: forming a groove 61 on the cover plate 72; forming a light adjustment material layer on the side of the encapsulation layer group 4 facing away from the display back plate 10, and adhering the side of the cover plate 72 with the groove 61 to the light adjustment material layer to make the light adjustment material layer form the light adjustment layer 5, that is, the second protruding structure 51 is formed on the light adjustment layer 5 by embossing the cover plate 72.

[0142] The preparation process for forming the groove 61 on the cover plate 72 is as follows: As shown in FIG16 , a photoresist 9 is coated on the mother plate 72a. A mask plate 100 is placed on the side of the photoresist 9 away from the display back plate 10. The mask plate 100 may include a light-shielding portion 101 and a light-transmitting portion 102. The light-transmitting portion 102 is arranged opposite to the position where the groove 61 is to be formed, and the remaining portion is arranged opposite to the light-shielding portion 101. Then, light is irradiated, and finally, the photoresist 9 is developed to remove the photoresist 9 arranged opposite to the light-transmitting portion 102 to form the structure shown in FIG17 . As shown in FIG18 , the mother plate 72a is etched using the remaining photoresist 9 as a mask layer to remove a portion of the exposed mother plate 72a to form the groove 61, and the remaining photoresist 9 is removed. As shown in FIG19 , the mother plate 72a is cut to form a plurality of cover plates 72.

[0143] As shown in Figures 8-11 , a light-adjusting material layer is formed on the side of the encapsulation layer group 4 facing away from the display backplane 10 through a coating, spin coating, or other process. The light-adjusting material layer is a colloid with a certain degree of fluidity. The side of the cover plate 72 with the groove 61 is attached to the light-adjusting material layer. A portion of the light-adjusting material layer flows into the groove 61 of the cover plate 72 to form the second protruding structure 51. Finally, the light-adjusting material layer is cured to form the light-adjusting layer 5.

[0144] In the case where the display panel further includes a cover plate 72 and a first adhesive layer 71 , a light adjustment layer 5 and a planarization layer 6 are sequentially formed on a side of the encapsulation layer group 4 facing away from the display back plate 10 , including:

[0145] A light-regulating material layer is formed on the side of the encapsulation layer group 4 facing away from the display backplane 10, and the light-regulating material layer is patterned to form the light-regulating layer 5. Specifically, a mask is placed on the side of the light-regulating material layer facing away from the display backplane 10. The mask includes a light-shielding portion and a semi-transparent portion. The light-shielding portion is positioned opposite the location where the second protruding structure 51 is to be formed, and the remaining portion is positioned opposite the semi-transparent portion. The light-regulating material layer is then irradiated with light, and finally developed to remove a portion of the light-regulating material layer opposite the semi-transparent portion, thereby forming the light-regulating layer 5.

[0146] A first adhesive layer 71 is formed on the side of the light-adjusting layer 5 facing away from the display backplane 10 through a coating, spin coating, or other process. The first adhesive layer 71 is a colloid with a certain degree of fluidity, forming a groove 61 on the side of the first adhesive layer 71 closest to the light-adjusting layer 5. Furthermore, the first adhesive layer 71 flattens the second protruding structure 51, providing a relatively flat surface for the cover plate 72, ensuring a good adhesion of the cover plate 72 and preventing defects such as bubbles after adhesion. The cover plate 72 is bonded to the side of the first adhesive layer 71 facing away from the display backplane 10. The first adhesive layer 71 not only serves to adjust the light but also serves to bond the cover plate 72 to the light-adjusting layer 5.

[0147] It should be noted that although the steps of the method for manufacturing a display panel in the present disclosure are described in a specific order in the accompanying drawings, this does not require or imply that the steps must be performed in this specific order, or that all steps must be performed to achieve the desired results. Additionally or alternatively, certain steps may be omitted, multiple steps may be combined into one step, and / or one step may be broken down into multiple steps.

[0148] Based on the same inventive concept, an exemplary embodiment of the present disclosure provides a display device, which may include any of the display panels described above. The specific structure of the display panel has been described in detail above, so it will not be repeated here.

[0149] The specific type of the display device is not particularly limited, and any type of display device commonly used in the field can be used, such as mobile devices such as mobile phones, wearable devices such as watches, VR devices, etc. Those skilled in the art can make corresponding choices based on the specific purpose of the display device, which will not be elaborated here.

[0150] It should be noted that, in addition to the display panel, the display device also includes other necessary components and components, such as the housing, circuit board, power cord, etc. Taking the display as an example, technical personnel in this field can make corresponding supplements based on the specific usage requirements of the display device, which will not be repeated here.

[0151] Compared with the prior art, the beneficial effects of the display device provided by the exemplary embodiment of the present invention are the same as the beneficial effects of the display panel provided by the above exemplary embodiment, and are not described in detail here.

[0152] Those skilled in the art will readily appreciate other embodiments of the present disclosure after considering the specification and practicing the invention disclosed herein. This application is intended to cover any variations, uses, or adaptations of the present disclosure that follow the general principles of the present disclosure and include common knowledge or customary techniques in the art not disclosed herein. The description and examples are to be considered as exemplary only, with the true scope and spirit of the present disclosure being indicated by the appended claims.

Claims

1. A display panel having a display area, the display area including a central area and a peripheral area surrounding the outer periphery of the central area, wherein, The display panel comprises: Display back panel; An encapsulation layer group is arranged on the light-emitting side of the display backplane, the encapsulation layer group comprises a first film layer and a second film layer, the second film layer is arranged on a side of the first film layer away from the display backplane, the refractive index of the second film layer is greater than the refractive index of the first film layer, and the first film layer forms a first protruding structure in the peripheral area; A light adjustment layer is provided on a side of the encapsulation layer group away from the display backplane, and a second protruding structure is provided on the light adjustment layer, and an orthographic projection of the second protruding structure on the display backplane at least partially overlaps with an orthographic projection of the first protruding structure on the display backplane; A planarization layer is arranged on the side of the light adjustment layer away from the display back panel, and a groove matching the second protrusion structure is arranged on the side of the planarization layer close to the light adjustment layer, and the second protrusion structure is located in the groove, and the refractive index of the planarization layer is less than the refractive index of the light adjustment layer.

2. The display panel according to claim 1, wherein The display panel further includes: The cover plate is arranged on the side of the light regulating layer away from the display back plate. The cover plate is the planarization layer. The groove is arranged on the side of the cover plate close to the light regulating layer.

3. The display panel according to claim 1, wherein, The display panel further includes: A first adhesive layer is provided on a side of the light regulating layer away from the display back plate, the first adhesive layer is the planarization layer, and a side of the first adhesive layer close to the light regulating layer is provided with the groove; The cover plate is bonded to a side of the first adhesive layer facing away from the display back plate.

4. The display panel according to claim 3, wherein, The refractive index of the cover plate is less than or equal to the refractive index of the first adhesive layer.

5. The display panel according to claim 1, wherein, The display panel further includes: A touch layer group is provided on a side of the encapsulation layer group away from the display backplane, the touch layer group includes a first insulating layer, a first touch layer, a second insulating layer, a second touch layer and a third insulating layer stacked in sequence, the light adjustment layer is one of the first insulating layer, the second insulating layer or the third insulating layer, and / or the planarization layer is the first insulating layer. The insulating layer, the second insulating layer or the third insulating layer.

6. The display panel according to any one of claims 1 to 5, wherein, The refractive index of the light adjustment layer is equal to or less than the refractive index of the second film layer.

7. The display panel according to any one of claims 1 to 5, wherein, The orthographic projection of the first protruding structure on the display backplane is located within the orthographic projection of the second protruding structure on the display backplane.

8. The display panel according to any one of claims 1 to 5, wherein, The first protruding structure is arranged to form a circle surrounding the central area, and the second protruding structure and the groove are arranged to form a circle surrounding the central area.

9. The display panel according to any one of claims 1 to 5, wherein, The second protruding structure includes at least one protruding ring surrounding the central area, and a surface of the protruding ring facing away from the display back plate includes one or both of a curved surface and a sloped surface.

10. The display panel according to claim 9, wherein, The height of the convex ring in the first direction decreases as the number of the convex rings included in the second protruding structure increases, and the first direction is perpendicular to a surface of the display backplane where the encapsulation layer group is disposed.

11. The display panel according to claim 10, wherein, When the second protruding structure includes one protruding ring, the height of the protruding ring in the first direction is greater than or equal to 3 micrometers and less than or equal to 6 micrometers.

12. The display panel according to claim 10, wherein, When the second protruding structure includes three of the convex rings, the height of the convex ring in the first direction is greater than or equal to 2 micrometers and less than or equal to 3 micrometers.

13. The display panel according to claim 12, wherein, In the second direction, the maximum ring width of the convex ring is greater than or equal to 3 micrometers and less than or equal to 5 micrometers, and the second direction is parallel to the surface of the display backplane where the encapsulation layer group is provided.

14. The display panel according to any one of claims 1 to 5, wherein, The encapsulation layer group includes: A first inorganic layer provided on the light-emitting side of the display backplane; An organic layer provided on the side of the first inorganic layer facing away from the display backplane, and the organic layer is the first film layer; A second inorganic layer provided on the side of the organic layer facing away from the display backplane, and the second inorganic layer is the second film layer.

15. A method for manufacturing a display panel, the display panel having a display area, the display area including a central area and a peripheral area surrounding the outer periphery of the central area, wherein, The manufacturing method includes: Providing a display backplane; Forming an encapsulation layer group on the light-emitting side of the display backplane. The encapsulation layer group includes a first film layer and a second film layer. The second film layer is provided on the side of the first film layer facing away from the display backplane, and the refractive index of the second film layer is greater than that of the first film layer. In the peripheral region, the first film layer is formed with a first protruding structure; Sequentially forming a light adjusting layer and a planarizing layer on the side of the encapsulation layer group facing away from the display backplane; Wherein, a second protruding structure is provided on the light adjusting layer, and the orthographic projection of the second protruding structure on the display backplane at least partially overlaps with the orthographic projection of the first protruding structure on the display backplane; a groove matching the second protruding structure is provided on the surface of the planarizing layer close to the light adjusting layer, the second protruding structure is located in the groove, and the refractive index of the planarizing layer is less than that of the light adjusting layer.

16. The manufacturing method of the display panel according to claim 15, wherein, The display panel further includes a cover plate; sequentially forming a light adjusting layer and a planarizing layer on the side of the encapsulation layer group facing away from the display backplane includes: The planarizing layer is the cover plate, and a groove is formed on the cover plate; Forming a light adjusting material layer on the side of the encapsulation layer group facing away from the display backplane, and attaching the surface of the cover plate with the groove to the light adjusting material layer so that the light adjusting material layer forms the light adjusting layer.

17. According to the manufacturing method of the display panel as claimed in claim 15, wherein, Sequentially forming a light adjusting layer and a planarizing layer on the side of the encapsulation layer group facing away from the display backplane includes: Forming a light adjusting material layer on the side of the encapsulation layer group facing away from the display backplane, and performing a patterning process on the light adjusting material layer to form the light adjusting layer; Forming a first adhesive layer on the side of the light adjusting layer facing away from the display backplane so that a groove is formed on the surface of the first adhesive layer close to the light adjusting layer, and the first adhesive layer is the planarizing layer; Bonding a cover plate on the side of the first adhesive layer facing away from the display backplane.

18. A display device, wherein, Includes: The display panel according to any one of claims 1 to 14.

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