Display panel and preparing method therefor, and display apparatus

Abstract

The present disclosure relates to the technical field of display, and discloses a display panel and a preparing method therefor, and a display apparatus. The display panel comprises a display substrate, a packaging layer group, and a first light enhancement layer; the display substrate comprises a plurality of sub-pixels; the packaging layer group is provided on the light-emitting side of the display substrate, and the packaging layer group comprises at least two organic film layers stacked; and the first light enhancement layer is provided on the side of the packaging layer group distant from the display substrate, the first light enhancement layer comprises a plurality of protrusions, and the orthographic projections of the protrusions on the display substrate at least partially overlap the sub-pixels. The display panel has high front light-emitting efficiency and low power consumption.

Description

Display panel and manufacturing method thereof, and display device

[0001] Cross-references

[0002] This disclosure claims priority to Chinese patent application number 202311213885.9 filed on September 19, 2023, entitled “Display panel, preparation method thereof, and display device”, and the entire contents of which are incorporated herein by reference. Technical Field

[0003] 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

[0004] Display panels using diode-based light-emitting devices meet consumers' emerging demands for display technology due to their high contrast ratio, fast refresh rate, wide viewing angle, wide temperature range, and high color rendering index. However, the external quantum efficiency of these display panels is typically only 20%, with the vast majority of the light energy being dissipated as surface plasmons or in optical waveguide modes due to total internal reflection caused by differences in the refractive index of the film dielectrics.

[0005] However, as consumers have increasingly higher requirements for display products, the current display modules have low brightness at a positive viewing angle, resulting in high power consumption of the product and failing to meet consumer requirements.

[0006] 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.

[0007] Summary of the Invention

[0008] 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 method for manufacturing the same, as well as a display device.

[0009] According to one aspect of the present disclosure, there is provided a display panel, comprising:

[0010] a display substrate comprising a plurality of sub-pixels;

[0011] an encapsulation layer group, provided on the light-emitting side of the display substrate, the encapsulation layer group comprising at least two stacked organic film layers;

[0012] The first light enhancement layer is provided on a side of the encapsulation layer group away from the display substrate. The first light enhancement layer comprises a plurality of protrusions, and the orthographic projections of the protrusions on the display substrate at least partially overlap with the sub-pixels.

[0013] In an exemplary embodiment of the present disclosure, a leveling performance improving layer is provided between two adjacent organic film layers.

[0014] In an exemplary embodiment of the present disclosure, the hydrophilicity of the leveling performance improving layer is stronger than the hydrophilicity of the organic film layer adjacent to the leveling performance improving layer and closer to the display substrate.

[0015] In an exemplary embodiment of the present disclosure, the leveling performance improving layer is made of an inorganic material, or the leveling performance improving layer is a surface fluorinated layer or a surface microstructure layer of the organic film layer closer to the display substrate.

[0016] In an exemplary embodiment of the present disclosure, the refractive index of the organic film layer adjacent to the leveling performance improving layer and further away from the display substrate is greater than or equal to the refractive index of the leveling performance improving layer.

[0017] In an exemplary embodiment of the present disclosure, the refractive index of at least two of the organic film layers increases as the distance from the display substrate increases.

[0018] In an exemplary embodiment of the present disclosure, the at least two organic film layers include:

[0019] A first organic layer is provided on the light-emitting side of the display substrate, and the leveling performance improvement layer is provided on a side of the first organic layer away from the display substrate;

[0020] a second organic layer, disposed on a side of the leveling performance improving layer away from the display substrate;

[0021] A concave structure is provided on a surface of the first organic layer close to the leveling performance improving layer, and a portion of the second organic layer located in the concave portion forms a convex structure.

[0022] In an exemplary embodiment of the present disclosure, the orthographic projection of one protruding structure on the display substrate at least partially overlaps with one sub-pixel, or the orthographic projections of multiple protruding structures on the display substrate at least partially overlap with one sub-pixel.

[0023] In an exemplary embodiment of the present disclosure, the display panel further includes:

[0024] The second light enhancement layer is disposed between the first light enhancement layer and the encapsulation layer group, and the refractive index of the second light enhancement layer is greater than the refractive index of the film layer adjacent to the second light enhancement layer in the encapsulation layer group.

[0025] In an exemplary embodiment of the present disclosure, the display panel further includes:

[0026] a buffer layer, disposed on a side of the first light enhancement layer close to the encapsulation layer group, wherein the buffer layer is made of a liquid-repellent material;

[0027] The planarization layer is provided on a side of the first light enhancement layer away from the display substrate, and the refractive index of the first light enhancement layer is greater than the refractive index of the planarization layer.

[0028] In an exemplary embodiment of the present disclosure, at least two stacked organic film layers form an organic film layer group, and the encapsulation layer group further includes:

[0029] A first inorganic layer is provided between the display substrate and the organic film layer group;

[0030] The second inorganic layer is provided on a side of the organic film layer group away from the display substrate.

[0031] According to another aspect of the present disclosure, a method for preparing a display panel is provided, comprising:

[0032] Providing a display substrate, the display substrate comprising a plurality of sub-pixels;

[0033] forming an encapsulation layer group on the light-emitting side of the display substrate, wherein the encapsulation layer group includes at least two stacked organic film layers;

[0034] A first light enhancement layer is formed on a side of the encapsulation layer group facing away from the display substrate. The first light enhancement layer includes a plurality of protrusions. Orthographic projections of the protrusions on the display substrate at least partially overlap with the sub-pixels.

[0035] In an exemplary embodiment of the present disclosure, an encapsulation layer group is formed on the light-emitting side of the display substrate, including:

[0036] forming a first organic layer on the light-emitting side of the display substrate;

[0037] performing plasma treatment on the first organic layer to form a leveling performance improvement layer on a side of the first organic layer facing away from the display substrate;

[0038] A second organic layer is formed on a side of the leveling performance improving layer facing away from the display substrate.

[0039] In an exemplary embodiment of the present disclosure, the plasma treatment includes a fluorination treatment or an oxidation treatment.

[0040] According to another aspect of the present disclosure, there is provided a display device, comprising:

[0041] The display panel is any one of the display panels described above.

[0042] The display panel disclosed herein, on one hand, comprises a first light-enhancing layer disposed on the side of the encapsulation layer assembly facing away from the display substrate. The first light-enhancing layer includes a plurality of protrusions that converge light emitted from sub-pixels, reducing the angle of emission of light with a larger inclination angle and emitting from the front of the display panel. This increases the front light extraction efficiency of the display panel, thereby reducing power consumption and minimizing color crosstalk between adjacent sub-pixels. Furthermore, the encapsulation layer assembly comprises at least two stacked organic film layers, increasing the thickness of the encapsulation layer assembly and bringing sub-pixels 17 closer to the optimal light extraction position of the protrusions 41. The protrusions further enhance the front light extraction efficiency of the display panel, thereby reducing power consumption.

[0043] 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

[0044] 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.

[0045] FIG1 is a schematic structural diagram of a first exemplary embodiment of a display panel according to the present disclosure.

[0046] FIG2 is a schematic diagram showing the size relationship between the protrusion, the encapsulation layer group, and the sub-pixel in the display panel of the present disclosure.

[0047] FIG3 is a schematic diagram showing a comparison of the brightness gain of a sub-pixel at a normal viewing angle before and after the thickness of the simulated encapsulation layer group 2 is increased.

[0048] FIG4 is a schematic structural diagram of a second exemplary embodiment of a display panel according to the present disclosure.

[0049] FIG5 is a schematic diagram of the optical path of an outgoing light beam of an exemplary embodiment of a display panel disclosed herein.

[0050] FIG6 is a schematic structural diagram of a third exemplary embodiment of a display panel according to the present disclosure.

[0051] FIG. 7 is a schematic structural diagram of a fourth exemplary embodiment of a display panel according to the present disclosure.

[0052] FIG. 8 is a schematic top view of a fifth exemplary embodiment of a display panel according to the present disclosure.

[0053] FIG9 is a schematic structural diagram of a sixth exemplary embodiment of a display panel according to the present disclosure.

[0054] FIG10 is a schematic flow chart of an exemplary embodiment of a method for manufacturing a display panel according to the present disclosure.

[0055] 11 to 15 are schematic structural diagrams of various steps in the preparation process of the encapsulation layer group in the method for preparing the display panel of the present disclosure.

[0056] Description of reference numerals:

[0057] 1. Display substrate; 11. Base substrate; 12. Driver backplane; 13. First planar layer; 14. Pixel definition layer; 15. Light-emitting device; 151. First electrode; 152. Light-emitting layer group; 153. Second electrode; 16. Light extraction layer; 17. Sub-pixel;

[0058] 2. Encapsulation layer group; 21. First inorganic layer; 22. Organic film layer; 22a. First organic layer; 22a1. Concave structure; 22b. Second organic layer; 22b1. Protruding structure; 23. Leveling performance improvement layer; 24. Second inorganic layer;

[0059] 3. Buffer layer;

[0060] 4. first light enhancement layer; 41. protrusion;

[0061] 5. Planarization layer; 6. Second light enhancement layer. DETAILED DESCRIPTION

[0062] 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.

[0063] 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.

[0064] 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.

[0065] 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 relationships can exist. For example, A and / or B can mean: A exists alone, A and B exist simultaneously, or B exists alone. Additionally, the character " / " in this document generally indicates that the related objects are in an "or" relationship.

[0066] An example embodiment of the present disclosure provides a display panel, as shown in FIG1 , the display panel may include a display substrate 1, an encapsulation layer group 2, and a first light enhancement layer 4; the display substrate 1 may include a plurality of sub-pixels 17; the encapsulation layer group 2 is arranged on the light-emitting side of the display substrate 1, and the encapsulation layer group 2 may include at least two stacked organic film layers 22; the first light enhancement layer 4 is arranged on the side of the encapsulation layer group 2 facing away from the display substrate 1, and the first light enhancement layer 4 includes a plurality of protrusions 41, and the orthographic projections of the protrusions 41 on the display substrate 1 at least partially overlap with the sub-pixels 17.

[0067] The display panel disclosed herein, on one hand, has a first light-enhancing layer 4 disposed on the side of the encapsulation layer group 2 facing away from the display substrate 1. This first light-enhancing layer 4 includes multiple protrusions 41. These protrusions 41 converge the light emitted by the sub-pixels 17, reducing the angle of light emitted from the front of the display panel. This increases the front light extraction efficiency of the display panel, thereby reducing power consumption and minimizing color crosstalk between adjacent sub-pixels 17. Furthermore, the encapsulation layer group 2 includes at least two stacked organic film layers 22, increasing its thickness. The protrusions 41 maximize the front light extraction efficiency of the display panel, thereby reducing power consumption.

[0068] The display substrate 1 can be an OLED (Organic Electroluminescence Display) display substrate 1, a QLED (Quantum Dot Light Emitting Diodes) display substrate 1, a Micro-LED (Micro-light emitting diode) display substrate 1, etc. The display substrate 1 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.

[0069] In this exemplary embodiment, taking the OLED display substrate 1 as an example, the display substrate 1 may include a base substrate 11 , a driving backplane 12 , and a light emitting device 15 . The driving backplane 12 may drive the light emitting device 15 to emit light.

[0070] The driving backplane 12 may include multiple switching units, each of which may include multiple thin film transistors, and the multiple switching units are arranged in an array; a first flat layer 13 is provided on the side of the multiple switching units away from the base substrate 11, and the first flat layer 13 provides a relatively flat base surface for the subsequently formed film layer.

[0071] A light emitting device 15 is provided on a side of the first planar layer 13 facing away from the base substrate 11 . The light emitting device 15 may include a first electrode 151 , a light emitting layer group 152 and a second electrode 153 .

[0072] Specifically, a first electrode 151 is provided on a side of the first planar layer 13 facing away from the base substrate 11 . The first electrode 151 is connected to the source of the driving backplane 12 . The first electrode 151 may be an anode.

[0073] A pixel definition layer 14 is provided on the side of the first electrode 151 facing away from the base substrate 11. A via is provided on the pixel definition layer 14, and a light-emitting layer group 152 is disposed within the via. A second electrode 153 is provided on the side of the light-emitting layer group 152 facing away from the base substrate 11. This second electrode 153 can be a cathode and is connected to the ground line VSS. Each light-emitting layer group 152 within a via hole emits light, forming a sub-pixel 17. Therefore, each light-emitting layer group 152 within a via hole constitutes a sub-pixel 17. The orthographic projection of the sub-pixel 17 on the display substrate 1 is the same as the orthographic projection of the light-emitting layer group 152 on the display substrate 1. The display substrate 1 may include multiple sub-pixels 17.

[0074] The light-emitting layer group 152 may include a hole injection layer, a hole transport layer, a 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 151, and the electron injection layer is in contact with the second electrode 153. Of course, in other exemplary embodiments of the present disclosure, the light-emitting layer group 152 may include only the hole transport layer, the light-emitting layer, and the electron transport layer. The light-emitting layer group 152 may also have other structures, and its specific structure can be set as needed.

[0075] A light extraction layer 16 (CPL) may be provided on the light-exiting side of the display substrate 1. This layer can improve the light extraction pattern of the display substrate 1, allowing light originally confined within the display substrate 1 to exit the display substrate 1, thereby achieving higher light extraction efficiency. Of course, the light extraction layer 16 may not be provided.

[0076] An encapsulation layer group 2 is provided on the side of the light extraction layer 16 facing away from the base substrate 11 . The encapsulation layer group 2 is used to encapsulate the display substrate 1 to prevent external moisture, impurities, etc. from entering the display substrate 1 and affecting the display effect of the display substrate 1 .

[0077] A first light enhancement layer 4 is provided on the side of the encapsulation layer group 2 facing away from the display substrate 1. The first light enhancement layer 4 may include a plurality of protrusions 41. The orthographic projections of the protrusions 41 on the display substrate 1 at least partially overlap with the sub-pixels 17. For example, the orthographic projections of the protrusions 41 on the display substrate 1 may cover the sub-pixels 17, or may coincide with the sub-pixels 17, or may partially overlap the orthographic projections of the protrusions 41 on the display substrate 1. The refractive index of the first light enhancement layer 4 is greater than or equal to 1.65.

[0078] The protrusion 41 can converge the light emitted by the sub-pixel 17, so that the emission angle of the light with a larger inclination angle becomes smaller and is emitted from the front of the display panel, thereby increasing the front light emission efficiency of the display panel and reducing the power consumption of the display panel; and reducing the cross-color between two adjacent sub-pixels 17.

[0079] However, experiments have shown that the increased light extraction efficiency achieved by the protrusions 41 of the first light enhancement layer 4 is relatively limited. The inventors have discovered that the main reason for this is that the protrusions 41 have a large radius of curvature, which prevents the sub-pixels 17 from being positioned at the optimal light extraction position within the protrusions 41, thus failing to maximize the light extraction efficiency of the display panel.

[0080] 2, Rc is the curvature radius of the protrusion 41, H is the arch height of the protrusion 41, and D is the opening size of the protrusion 41. According to the triangular relationship Rc 2 =(D / 2) 2 +(Rc-H)2 , we can get Rc=H / 2+D 2 / 8H, under normal circumstances, H can be set to 10μm (micrometers) and D can be set to 50μm; thus, Rc can be obtained as 36.25μm.

[0081] Furthermore, the relationship between the focal length of protrusion 41 and its radius of curvature is fμ = Rc / Δn, where fμ is the focal length of protrusion 41, and Δn is the difference in refractive index between the protrusion 41 and the material on the side of the protrusion 41 facing away from the encapsulation layer assembly 2. Typically, Δn is around 0.35, resulting in fμ being approximately 103.5 μm, a distance much greater than the thickness of the current encapsulation layer assembly 2.

[0082] The focal length of the protrusion 41 can be reduced by reducing the radius of curvature Rc of the protrusion 41. However, due to the current preparation process of the protrusion 41 and the thickness limitation of the film layer of the protrusion 41, the radius of curvature Rc of the protrusion 41 cannot be reduced. Specifically, when the protrusion 41 is formed by printing, the radius of curvature Rc of the protrusion 41 depends on the liquid-repellent property of the buffer layer 3. Generally, the stronger the liquid-repellent property of the buffer layer 3, the higher the arch height of the protrusion 41. However, the material of the buffer layer 3 is generally fixed, and therefore, the radius of curvature Rc of the protrusion 41 is also a fixed value. When the protrusion 41 is formed by photolithography, the higher the arch height of the protrusion 41, the thicker the required thickness, which makes it easy to form a planar structure in the middle part of the protrusion 41, making it impossible to achieve convergence of light.

[0083] 3 , when the thickness of the simulated encapsulation layer group 2 increases within a certain range, the brightness gain at a normal viewing angle increases significantly.

[0084] It can be seen from the figure that the thickness of the simulated encapsulation layer group 2 increases from about 13.5μm to about 21.5μm, the positive viewing angle brightness gain of the blue sub-pixel B increases from about 123% to about 135%, the positive viewing angle brightness gain of the green sub-pixel G increases from about 122% to about 133%, and the positive viewing angle brightness gain of the red sub-pixel R increases from about 121% to about 132%, all of which increase by more than about 10%.

[0085] In this exemplary embodiment, the encapsulation layer group 2 may include at least two stacked organic film layers 22. That is, the thickness of the encapsulation layer group 2 is increased by adding the organic film layer 22. This allows the sub-pixel 17 to be closer to the optimal light extraction position of the protrusion 41, thereby further improving the front light extraction efficiency of the display panel through the protrusion 41.

[0086] Refer to Table 1 for a comparison of the light efficiency gains of green and blue sub-pixels when the thickness of the encapsulation layer group 2 is approximately 15 μm in the conventional technology (the thickness of the encapsulation layer group 2 is approximately 15 μm) and when the thickness is increased in the present invention (the thickness of the encapsulation layer group 2 is approximately 30 μm).

[0087] Table 1

[0088] It can be seen from Table 1 and Figure 3 that the actual effect is consistent with the simulation effect. By increasing the thickness of the encapsulation layer group 2, the sub-pixel 17 can be brought closer to the optimal light extraction position of the protrusion 41, so that the front light extraction efficiency of the display panel can be greatly improved through the protrusion 41.

[0089] As shown in Figure 1, the encapsulation layer group 2 may include at least two stacked organic film layers 22, that is, the encapsulation layer group 2 may include two organic film layers 22, three organic film layers 22, or more organic film layers 22. The thickness of the encapsulation layer group 2 is increased by increasing the number of organic film layers 22. Since the thickness of the organic film layer 22 is relatively thick, the thickness of the encapsulation layer group 2 can be effectively increased by increasing the number of organic film layers 22; the thickness of the inorganic film layer is relatively thin, and even if the thickness of the inorganic film layer is increased, the thickness of the encapsulation layer group 2 cannot be effectively increased. In addition, the organic film layer 22 is relatively soft, and even if the number of organic film layers 22 is increased, it has little effect on the bending effect of the display panel; however, the material of the inorganic film layer is relatively brittle, and increasing the thickness or number of the inorganic film layer will seriously affect the bending effect of the display panel. Moreover, the thicker inorganic film layer is prone to falling off and warping, affecting the display effect of the display panel.

[0090] In this example embodiment, as shown in Figure 1, the encapsulation layer group 2 may include a first inorganic layer 21, which is arranged on the light-emitting side of the display substrate 1. The material of the first inorganic layer 21 can be SiN (silicon nitride), SiO (silicon oxide) or SiNO (silicon oxynitride) and the like.

[0091] The thickness of the first inorganic layer 21 is greater than or equal to 0.1 μm and less than or equal to 2 μm. For example, the thickness of the first inorganic layer 21 can be 0.15 μm, 0.2 μm, 0.25 μm, 0.3 μm, 0.35 μm, 0.4 μm, 0.45 μm, 0.5 μm, 0.55 μm, 0.6 μm, 0.65 μm, 0.7 μm, 0.75 μm, 0.8 μm, 0.85 μm, 0.9μm, 0.95μm, 1μm, 1.05μm, 1.1μm, 1.15μm, 1.2μm, 1.25μm, 1.3μm, 1.35μm, 1.4μm, 1. 45μm, 1.5μm, 1.55μm, 1.6μm, 1.65μm, 1.7μm, 1.75μm, 1.8μm, 1.85μm, 1.9μm, 1.95μm, etc.

[0092] At least two stacked organic film layers 22 form an organic film layer group. The organic film layer group is disposed on the side of the first inorganic layer 21 facing away from the display substrate 1 , such that the first inorganic layer 21 is disposed between the display substrate 1 and the organic film layer group 22 .

[0093] The organic film layer 22 is generally formed by printing, that is, the liquid of the organic material is formed on the light-emitting side of the display substrate 1 by printing, and the organic film layer 22 is formed after the liquid of the organic material is solidified; therefore, the thickness of the organic film layer 22 printed at one time cannot be too thick. If it is too thick, it will not be easy to solidify, which will affect the production efficiency. Even if it is barely solidified, it is easy to cause stress concentration; and too thick liquid of the organic material will cause overflow, abnormal leveling and other problems.

[0094] By forming at least two stacked organic film layers 22 through at least two printing steps, the overall thickness of the organic film layers 22 can be increased exponentially, thereby increasing the thickness of the encapsulation layer group 2 .

[0095] The following description will be made by taking the example that the at least two organic film layers 22 include two organic film layers 22. That is, the at least two stacked organic film layers 22 may include a first organic layer 22a and a second organic layer 22b.

[0096] The first organic layer 22a is arranged on the light-emitting side of the display substrate 1. Specifically, the first organic layer 22a is arranged on the side of the first inorganic layer 21 away from the display substrate 1. The first organic layer 22a can be formed by printing. The thickness of the first organic layer 22a is greater than or equal to 2μm and less than or equal to 15μm. For example, the thickness of the first organic layer 22a can be 2.5μm, 3μm, 3.5μm, 4μm, 4.5μm, 5μm, 5.5μm, 6μm, 6.5μm, 7μm, 7.5μm, 8μm, 8.5μm, 9μm, 9.5μm, 10μm, 10.5μm, 11μm, 11.5μm, 12μm, 12.5μm, 13μm, 13.5μm, 14μm, 14.5μm and so on.

[0097] The refractive index of the first organic layer 22a is approximately 1.4.

[0098] The second organic layer 22 b is disposed on a side of the first organic layer 22 a away from the display substrate 1 . The second organic layer 22 b can be formed by printing.

[0099] Specifically, the refractive index of the second organic layer 22 b is about 1.65.

[0100] However, the surface of the solidified first organic layer 22a has a liquid-repellent structure, which is not conducive to the leveling of the liquid of the subsequently printed organic material, resulting in poor flatness of the subsequently formed second organic layer 22b, affecting the display effect of the display panel; moreover, the liquid of the subsequently printed organic material is prone to overflow and other problems.

[0101] Furthermore, a leveling performance-enhancing layer 23 is provided between two adjacent organic film layers 22, that is, between the first organic layer 22a and the second organic layer 22b. The leveling performance-enhancing layer 23 can change the surface liquid repellency of the first organic layer 22a. Specifically, the leveling performance-enhancing layer 23 has a stronger hydrophilicity than the organic film layer 22 adjacent to the display substrate 1. In the case of two organic film layers 22, the leveling performance-enhancing layer 23 has a stronger hydrophilicity than the first organic layer 22a. The leveling performance-enhancing layer 23 ensures that the subsequently formed organic material liquid is well leveled, thereby ensuring that the second organic layer 22b formed after curing has good flatness, thereby ensuring the display quality of the display panel. Furthermore, the subsequently formed organic material liquid is less likely to overflow.

[0102] Specifically, as shown in FIG2 , the material of the leveling performance improving layer 23 may be an inorganic material, for example, the material of the leveling performance improving layer 23 may be SiN (silicon nitride), SiO (silicon oxide) or SiNO (silicon oxynitride), etc. The thickness of the leveling performance improving layer 23 is greater than or equal to 0.05 μm and less than or equal to 2 μm. For example, the thickness of the leveling performance improving layer 23 may be 0.1 μm, 0.15 μm, 0.2 μm, 0.25 μm, 0.3 μm, 0.35 μm, 0.4 μm, 0.45 μm, 0.5 μm, 0.55 μm, 0.6 μm, 0.65 μm, 0.7 μm, 0.75 μm, 0.8 μm, 0.9 μm, 10 μm, 11 μm, 12 μm, 13 μm, 14 μm, 15 μm, 16 μm, 17 μm, 18 μm, 19 μm, 20 μm, 21 μm, 22 μm, 23 μm, 24 μm, 25 μm, 26 μm, 27 μm, 28 μm, 29 μm, 30 μm, 31 μm, 32 μm, 33 μm, 34 μm, 35 μm, 36 μm, 37 μm, 38 μm, 39 μm, 40 μm, 41 μm, 42 μm, 43 μm, 44 μm, 45 μm, 46 μm, 47 μm, 48 μm, 49 μm, 50 μm, 51 μm, 52 μm, 53 μm, 5 85μm, 0.9μm, 0.95μm, 1μm, 1.05μm, 1.1μm, 1.15μm, 1.2μm, 1.25μm, 1.3μm, 1.35μm, 1.4μm, 1.45μm, 1.5μm, 1.55μm, 1.6μm, 1.65μm, 1.7μm, 1.75μm, 1.8μm, 1.85μm, 1.9μm, 1.95μm, etc.

[0103] Of course, in some other example embodiments of the present disclosure, the material of the leveling performance improvement layer 23 can be an organic material, as long as the hydrophilicity of the organic material meets the requirements. For example, the material of the leveling performance improvement layer 23 can be acrylic, polyurethane, etc. In this case, the thickness of the leveling performance improvement layer 23 is less than or equal to 10μm. For example, the thickness of the leveling performance improvement layer 23 can be 1μm, 2μm, 3μm, 4μm, 5μm, 6μm, 7μm, 8μm, 9μm, etc.

[0104] Furthermore, the refractive index of the organic film layer 22 facing away from the display substrate 1 is greater than that of the leveling-improving layer 23. Specifically, the refractive index of the second organic layer 22b is greater than that of the leveling-improving layer 23. For example, the refractive index of the leveling-improving layer 23 is approximately 1.6, which is less than the refractive index of 1.65 of the second organic layer 22b. Similarly, light is directed from the material with a lower refractive index to the material with a higher refractive index, thereby converging light with a larger inclination angle in the forward direction, improving the forward light extraction efficiency of the display panel.

[0105] In some other exemplary embodiments of the present disclosure, as shown in FIG4 , the leveling performance improving layer 23 may be a surface fluorinated layer or surface microstructure layer of the organic film layer 22 closer to the display substrate 1. That is, the leveling performance improving layer 23 may be a surface fluorinated layer or surface microstructure layer of the first organic layer 22a. The surface fluorinated layer is formed by F-ion plasma treatment, and the surface fluorinated layer can change the liquid-repellent properties of the surface of the first organic layer 22a. In other words, the surface fluorinated layer has better lyophilic properties.

[0106] The surface microstructure layer is formed by oxygen plasma treatment. Oxygen plasma bombardment of the surface of the first organic layer 22a forms a rugged structured layer on the surface of the first organic layer 22a. This rugged structured layer serves as the surface microstructure layer. The surface microstructure layer can alter the contact angle of the surface of the first organic layer 22a, resulting in a smaller contact angle, which can also be considered as having better lyophilic properties.

[0107] Thus, the surface fluorination layer or the surface microstructure layer allows the liquid of the subsequently formed organic material to be well leveled, and the second organic layer 22b formed after curing has good flatness to ensure the display effect of the display panel; and the liquid of the subsequently formed organic material is not prone to overflow and other problems.

[0108] Moreover, the surface fluorination layer can reduce the surface polarity of the first organic layer 22a, inhibit the formation of hydrogen bonds and combine with oxygen in the buffer layer 3, thereby slowing down the diffusion of water vapor, improving the barrier performance of the encapsulation layer group 2, and thus improving the encapsulation reliability.

[0109] In this case, the thickness of the second organic layer 22b can be made thicker. Specifically, the thickness of the second organic layer 22b is greater than or equal to 5μm and less than or equal to 20μm. For example, the thickness of the second organic layer 22b can be 5.5μm, 6μm, 6.5μm, 7μm, 7.5μm, 8μm, 8.5μm, 9μm, 9.5μm, 10μm, 10.5μm, 11μm, 11.5μm, 12μm, 12.5μm, 13μm, 13.5μm, 14μm, 14.5μm, 15μm, 15.5μm, 16μm, 16.5μm, 17μm, 17.5μm, 18μm, 18.5μm, 19μm, 19.5μm and the like.

[0110] As shown in FIG5 , where the dotted lines represent comparative light paths, the refractive index of at least two organic film layers 22 increases with increasing distance from the display substrate 1. For example, when two organic film layers 22 are provided, the refractive index of the second organic layer 22b is greater than that of the first organic layer 22a. When three organic film layers 22 are provided, the refractive index of the second organic layer 22b is greater than that of the first organic layer 22a, and the refractive index of the third organic film layer 22 is greater than that of the second organic layer 22b. This allows light to be emitted from a material with a lower refractive index to a material with a higher refractive index, thereby converging light with a larger inclination angle in the forward direction, thereby improving the forward light extraction efficiency of the display panel.

[0111] Further, referring to Figures 6 to 8, a recessed structure 22a1 is provided on one side of the first organic layer 22a close to the leveling performance improvement layer 23, that is, a recessed structure 22a1 is provided on one side of the first organic layer 22a facing away from the display substrate 1, and the portion of the second organic layer 22b located in the recessed portion forms a protruding structure 22b1.

[0112] The recessed structure 22a1 can be formed by embossing or exposure. A leveling improvement layer 23 is then formed on the side of the first organic layer 22a facing away from the display substrate 1. Because the leveling improvement layer 23 is relatively thin, the recessed structure 22a1 remains after the leveling improvement layer 23 is formed. The specific structure of the leveling improvement layer 23 has been described in detail above and will not be repeated here. Finally, a second organic layer 22b is formed on the side of the leveling improvement layer 23 facing away from the display substrate 1. A portion of the second organic layer 22b forms within the recessed portion, forming the protruding structure 22b1.

[0113] The protruding structure 22b1 forms a converging lens to converge the light incident on the protruding structure 22b1, so that the light with a larger inclination angle has a smaller exit angle and is emitted from the front of the display panel, thereby increasing the front light output efficiency of the display panel and reducing the power consumption of the display panel.

[0114] As shown in Figure 6, the orthographic projection of a protruding structure 22b1 on the display substrate 1 at least partially overlaps with a sub-pixel 17. For example, the orthographic projection of a protruding structure 22b1 on the display substrate 1 may cover a sub-pixel 17, or the orthographic projection of a protruding structure 22b1 on the display substrate 1 may coincide with a sub-pixel 17, or the orthographic projection of a protruding structure 22b1 on the display substrate 1 may cover a portion of a sub-pixel 17.

[0115] 7 and 8 , the protruding structure 22b1 is indicated by a dotted line in FIG8 because it is blocked. In some other example embodiments of the present disclosure, the orthographic projections of the plurality of protruding structures 22b1 on the display substrate 1 at least partially overlap with a sub-pixel 17, that is, the recessed structure 22a1 and the protruding structure 22b1 are arranged to be smaller, so that the orthographic projection area of ​​the protruding structure 22b1 on the display substrate 1 is smaller than the area of ​​the sub-pixel 17, and the orthographic projections of the plurality of protruding structures 22b1 on the display substrate 1 can cover one sub-pixel 17.

[0116] As shown in FIG7 , the recessed structure 22a1 and the protruding structure 22b1 may not be provided between adjacent sub-pixels 17. As shown in FIG8 , the recessed structure 22a1 and the protruding structure 22b1 may also be provided between adjacent sub-pixels 17, so that the display area of ​​the entire display panel is provided with the recessed structure 22a1 and the protruding structure 22b1. This facilitates the design of technicians and simplifies the manufacturing process, eliminating the need to define the equipment in which areas the recessed structure 22a1 and the protruding structure 22b1 are formed and in which areas the recessed structure 22a1 and the protruding structure 22b1 are not formed.

[0117] In this exemplary embodiment, as shown in FIG1 , the encapsulation layer group 2 may further include a second inorganic layer 24. The second inorganic layer 24 is disposed on a side of the organic film layer 22 group facing away from the display substrate 1. Specifically, the second inorganic layer 24 is disposed on a side of the second organic layer 22b facing away from the display substrate 1. The second inorganic layer 24 can improve the water and oxygen barrier properties of the encapsulation layer group 2. The material of the second inorganic layer 24 may be SiN. The thickness of the second inorganic layer 24 may be greater than or equal to 0.5 μm and less than or equal to 2 μm. For example, the thickness of the second inorganic layer 24 may be 0.55 μm, 0.6 μm, 0.65 μm, 0.7 μm, 0.75 μm, 0.8 μm, 0.85 μm, 0.9 μm, 0.10 μm, 0.15 μm, 0.20 μm, 0.30 μm, 0.40 μm, 0.50 μm, 0.60 μm, 0.70 μm, 0.80 μm, 0.90 ... .95μm, 1μm, 1.05μm, 1.1μm, 1.15μm, 1.2μm, 1.25μm, 1.3μm, 1.35μm, 1.4μm, 1.45μm, 1.5μm, 1.55μm, 1.6μm, 1.65μm, 1.7μm, 1.75μm, 1.85μm, 1.85μm, 1.95μm, 1.95μm, etc.

[0118] The display panel may further include a buffer layer 3, which is disposed on a side of the first light enhancement layer 4 near the encapsulation layer group 2. Specifically, the buffer layer 3 is disposed between the second inorganic layer 24 and the first light enhancement layer 4. The buffer layer 3 is made of a liquid-repellent material. The liquid-repellent property of the buffer layer 3 is related to the morphology of the protrusions 41. Generally, the stronger the liquid-repellent property of the buffer layer 3, the higher the arch height of the protrusions 41. The provision of the buffer layer 3 can enable the protrusions 41 of the first light enhancement layer 4 to form a better convex lens morphology, ensuring that the protrusions 41 have the effect of converging light.

[0119] A planarization layer 5 is provided on the side of the first light enhancement layer 4 facing away from the display substrate 1. The refractive index of the first light enhancement layer 4 is greater than the refractive index of the planarization layer 5. Specifically, the refractive index of the planarization layer 5 is less than or equal to 1.6, which is less than the refractive index of the first light enhancement layer 4 described above, which is greater than or equal to 1.65. The greater the difference between the refractive index of the planarization layer 5 and the refractive index of the first light enhancement layer 4, that is, the greater the Δn in the above formula, the smaller the focal length of the protrusion 41. Therefore, the greater the difference between the refractive index of the planarization layer 5 and the refractive index of the first light enhancement layer 4, the smaller the thickness of the encapsulation layer group 2 can be set, and it can also ensure that the sub-pixel 17 is basically located in the focal plane of the protrusion 41. However, if the refractive index of the planarization layer 5 is too small, it is more difficult to select the material for the planarization layer 5.

[0120] Of course, in some other exemplary embodiments of the present disclosure, the planarization layer 5 may not be provided.

[0121] As shown in Figure 9, in some example embodiments of the present disclosure, the display panel may further include a second light enhancement layer 6, which is arranged between the first light enhancement layer 4 and the encapsulation layer group 2. Specifically, the second light enhancement layer 6 is arranged between the second inorganic layer 24 and the buffer layer 3 of the encapsulation layer group 2. The refractive index of the second light enhancement layer 6 is greater than the refractive index of the film layer adjacent to the second light enhancement layer 6 in the encapsulation layer group 2, that is, the refractive index of the second light enhancement layer 6 is greater than the refractive index of the second inorganic layer 24, so that when the light emitted from the second inorganic layer 24 hits the second light enhancement layer 6, it is emitted from a light-sparse medium to a light-dense medium, and the light with a larger inclination angle will be refracted toward the center position and emitted from the front of the display panel, thereby increasing the front light output efficiency of the display panel to reduce the power consumption of the display panel.

[0122] Based on the same inventive concept, an exemplary embodiment of the present disclosure provides a method for manufacturing a display panel. As shown in FIG10 , the method may include the following steps:

[0123] In step S10 , a display substrate 1 is provided, wherein the display substrate 1 includes a plurality of sub-pixels 17 .

[0124] In step S20 , an encapsulation layer group 2 is formed on the light-emitting side of the display substrate 1 , wherein the encapsulation layer group 2 includes at least two stacked organic film layers 22 .

[0125] In step S30 , a first light enhancement layer 4 is formed on a side of the encapsulation layer group 2 facing away from the display substrate 1 . The first light enhancement layer 4 includes a plurality of protrusions 41 . The orthographic projections of the protrusions 41 on the display substrate at least partially overlap with the sub-pixels 17 .

[0126] 11 , a display substrate 1 is provided. The method for preparing the display substrate 1 is a method known in the prior art, and therefore, will not be described in detail herein.

[0127] Forming the encapsulation layer group 2 on the light-emitting side of the display substrate 1 may include: as shown in FIG12 , forming a first inorganic layer 21 on the light-emitting side of the display substrate 1 by a process such as chemical vapor deposition; and forming a first organic layer 22a on the side of the first inorganic layer 21 facing away from the display substrate 1 by a process such as printing or coating. As shown in FIG13 , plasma treatment is performed on the first organic layer 22a to form a leveling performance improvement layer 23 on the side of the first organic layer 22a facing away from the display substrate 1. Specifically, the plasma treatment may include fluorination, for example, by using NF3 gas to fluorinate the side of the first organic layer 22a facing away from the display substrate 1. Fluoride ions are inserted into the polymer chains of the first organic layer 22a to form -CF2 and -CF3 bonds, thereby forming the leveling performance improvement layer 23. The leveling performance improvement layer 23 is a surface fluorinated layer to change the liquid-repellent properties of the entire surface of the first organic layer 22a.

[0128] Of course, the plasma treatment may include plasma treatment with oxygen ions, where oxygen ions bombard the surface of the first organic layer 22a to form an uneven structure layer on the surface of the first organic layer 22a. The uneven structure layer is a surface microstructure layer, thereby forming a surface microstructure layer on the surface of the first organic layer 22a, thereby improving the contact angle of the first organic layer 22a.

[0129] As shown in Figure 14 , a second organic layer 22b is then formed on the side of the leveling performance improving layer 23 facing away from the display substrate 1 through a printing, coating, or other process. The leveling performance improving layer 23 allows the subsequently formed organic material liquid to flow smoothly, thereby ensuring that the second organic layer 22b formed after curing has good flatness, thereby ensuring the display quality of the display panel.

[0130] Of course, as shown in Figure 15, after the second organic layer 22b is formed, the second inorganic layer 24 can be formed by processes such as chemical vapor deposition. The formation processes of the first inorganic layer 21 and the second inorganic layer 24 are processes in the prior art, so they are not repeated here.

[0131] The process for forming the first light enhancement layer 4 is a process in the prior art, and therefore, it will not be described in detail here.

[0132] 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.

[0133] 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.

[0134] 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 repeated here.

[0135] 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.

[0136] 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.

[0137] 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, wherein: include: A display substrate including a plurality of sub-pixels; An encapsulation layer group, arranged on the light-emitting side of the display substrate, the encapsulation layer group comprising at least two stacked organic film layers; The first light enhancement layer is disposed on a side of the encapsulation layer group away from the display substrate, and the first light enhancement layer comprises a plurality of protrusions, and the orthographic projections of the protrusions on the display substrate at least partially overlap with the sub-pixels.

2. The display panel according to claim 1, wherein: A leveling performance improving layer is arranged between two adjacent organic film layers.

3. The display panel according to claim 2, wherein: The hydrophilicity of the leveling performance improving layer is stronger than the hydrophilicity of the organic film layer adjacent to the leveling performance improving layer and closer to the display substrate.

4. The display panel according to claim 3, wherein: The leveling performance improvement layer is made of an inorganic material, or the leveling performance improvement layer is a surface fluorination layer or a surface microstructure layer of the organic film layer closer to the display substrate.

5. The display panel according to claim 2, wherein: The refractive index of the organic film layer adjacent to the leveling performance improving layer and further away from the display substrate is greater than or equal to the refractive index of the leveling performance improving layer.

6. The display panel according to claim 1, wherein: The refractive index of at least two of the organic film layers increases with increasing distance from the display substrate.

7. The display panel according to any one of claims 2 to 6, wherein: At least two of the organic film layers include: A first organic layer is provided on the light-emitting side of the display substrate, and the leveling performance improvement layer is provided on a side of the first organic layer away from the display substrate; A second organic layer is provided on a side of the leveling performance improvement layer away from the display substrate; A concave structure is provided on one side of the first organic layer close to the leveling performance improving layer, and a portion of the second organic layer located in the concave portion forms a convex structure.

8. The display panel according to claim 7, wherein: An orthographic projection of one of the protruding structures on the display substrate at least partially overlaps with one of the sub-pixels, or an orthographic projection of a plurality of the protruding structures on the display substrate at least partially overlaps with one of the sub-pixels.

9. The display panel according to any one of claims 1 to 6, wherein: The display panel further includes: The second light enhancement layer is disposed between the first light enhancement layer and the packaging layer group, and the refractive index of the second light enhancement layer is greater than the refractive index of the film layer adjacent to the second light enhancement layer in the packaging layer group.

10. The display panel according to any one of claims 1 to 6, wherein: The display panel further includes: a buffer layer, disposed on a side of the first light enhancement layer close to the encapsulation layer group, wherein the buffer layer is made of a liquid-repellent material; The planarization layer is disposed on a side of the first light enhancement layer away from the display substrate, and the refractive index of the first light enhancement layer is greater than the refractive index of the planarization layer.

11. The display panel according to any one of claims 1 to 6, wherein: At least two stacked organic film layers form an organic film layer group, and the encapsulation layer group further includes: A first inorganic layer is provided between the display substrate and the organic film layer group; The second inorganic layer is disposed on a side of the organic film layer group away from the display substrate.

12. A method for preparing a display panel, wherein: include: Providing a display substrate, the display substrate comprising a plurality of sub-pixels; forming an encapsulation layer group on the light-emitting side of the display substrate, wherein the encapsulation layer group includes at least two stacked organic film layers; A first light enhancement layer is formed on a side of the encapsulation layer group facing away from the display substrate, wherein the first light enhancement layer comprises a plurality of protrusions, and the orthographic projections of the protrusions on the display substrate at least partially overlap with the sub-pixels.

13. The method for preparing a display panel according to claim 12, wherein: An encapsulation layer group is formed on the light-emitting side of the display substrate, comprising: forming a first organic layer on the light-emitting side of the display substrate; performing plasma treatment on the first organic layer so as to form a leveling performance improvement layer on a side of the first organic layer facing away from the display substrate; A second organic layer is formed on a side of the leveling performance improving layer facing away from the display substrate.

14. The method for preparing a display panel according to claim 13, wherein: The plasma treatment includes a fluorination treatment or an oxidation treatment.

15. A display device, wherein: include: A display panel is the display panel according to any one of claims 1 to 11.

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