Display panel, preparation method thereof and display device

Abstract

The present disclosure relates to the technical field of display, and discloses a display panel, a preparation method thereof and a display device. The display panel comprises a display substrate, an encapsulation layer group and a first light enhancement layer. The display substrate comprises a plurality of sub-pixels. The encapsulation layer group is arranged on the light-emitting side of the display substrate, and comprises at least two layers of stacked organic film layers. The first light enhancement layer is arranged on the side of the encapsulation layer group away from the display substrate, and comprises a plurality of protruding portions. The orthographic projection of the protruding portions on the display substrate at least partially overlaps with the sub-pixels. The display panel has high front light-emitting efficiency and low power consumption.

Description

Technical Field

[0001] This disclosure relates to the field of display technology, and more specifically, to a display panel, a method for manufacturing the same, and a display device. Background Technology

[0002] Display panels using diode-based light-emitting devices (LEDs) offer advantages such as high contrast, fast refresh rate, wide viewing angles, a wide temperature range, and high color rendering index, meeting consumers' evolving demands for display technology. However, the external quantum efficiency of these panels is typically only 20%, meaning that the vast majority of light energy is consumed as plasma on the metal surface or through total internal reflection in waveguide modes due to differences in the refractive index of the film layers.

[0003] However, as consumers have increasingly higher requirements for display products, the current display modules have low brightness at the front viewing angle, resulting in high power consumption and failing to meet consumer demands.

[0004] It should be noted that the information disclosed in the background section above is only used to enhance the understanding of the background of this disclosure, and therefore may include information that does not constitute prior art known to those skilled in the art. Summary of the Invention

[0005] The purpose of this disclosure is to overcome the shortcomings of the prior art and provide a display panel, a method for manufacturing the same, and a display device.

[0006] According to one aspect of this disclosure, a display panel is provided, comprising:

[0007] The display substrate includes multiple sub-pixels;

[0008] An encapsulation layer assembly is disposed on the light-emitting side of the display substrate, and the encapsulation layer assembly includes at least two stacked organic film layers;

[0009] A first light enhancement layer is disposed on the side of the encapsulation layer group opposite to the display substrate. The first light enhancement layer includes a plurality of protrusions, and the orthographic projection of the protrusions on the display substrate at least partially overlaps with the sub-pixel.

[0010] In one exemplary embodiment of this disclosure, a leveling performance improvement layer is provided between two adjacent organic film layers.

[0011] In one exemplary embodiment of this disclosure, the hydrophilicity of the leveling performance improvement layer is stronger than that of the organic film layer adjacent to and closer to the display substrate.

[0012] In one exemplary embodiment of this disclosure, the leveling performance improvement layer is made of an inorganic material, or the leveling performance improvement layer is a surface fluorinated layer or surface microstructure layer of the organic film layer closer to the display substrate.

[0013] In one exemplary embodiment of this disclosure, the refractive index of the organic film layer adjacent to the leveling performance improvement layer and further away from the display substrate is greater than or equal to the refractive index of the leveling performance improvement layer.

[0014] In one exemplary embodiment of this disclosure, the refractive index of at least two of the organic film layers increases with increasing distance from the display substrate.

[0015] In one exemplary embodiment of this disclosure, at least two of the organic film layers include:

[0016] A first organic layer is disposed on the light-emitting side of the display substrate, and the leveling performance improvement layer is disposed on the side of the first organic layer opposite to the display substrate.

[0017] The second organic layer is disposed on the side of the leveling performance improvement layer away from the display substrate;

[0018] The first organic layer has a recessed structure on the side near the leveling performance improvement layer, and the portion of the second organic layer located within the recessed portion forms a protruding structure.

[0019] In one exemplary embodiment of this disclosure, the orthographic projection of one of the protruding structures on the display substrate at least partially overlaps with one of the sub-pixels, or the orthographic projections of multiple protruding structures on the display substrate at least partially overlap with one of the sub-pixels.

[0020] In one exemplary embodiment of this disclosure, the display panel further includes:

[0021] A second light enhancement layer is disposed between the first light enhancement layer and the encapsulation layer group, wherein 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.

[0022] In one exemplary embodiment of this disclosure, the display panel further includes:

[0023] A buffer layer is disposed on the side of the first light enhancement layer near the encapsulation layer group, and the buffer layer is made of a hydrophobic material;

[0024] A planarization layer is disposed on the side of the first light enhancement layer opposite to the display substrate, wherein the refractive index of the first light enhancement layer is greater than the refractive index of the planarization layer.

[0025] In one exemplary embodiment of this disclosure, at least two stacked organic film layers form an organic film layer group, and the encapsulation layer group further includes:

[0026] A first inorganic layer is disposed between the display substrate and the organic film layer group;

[0027] The second inorganic layer is disposed on the side of the organic film layer group opposite to the display substrate.

[0028] According to another aspect of this disclosure, a method for manufacturing a display panel is provided, comprising:

[0029] A display substrate is provided, the display substrate comprising a plurality of sub-pixels;

[0030] An encapsulation layer group is formed on the light-emitting side of the display substrate, the encapsulation layer group comprising at least two stacked organic film layers;

[0031] A first light enhancement layer is formed on the side of the encapsulation layer that is away from the display substrate. The first light enhancement layer includes a plurality of protrusions, and the orthographic projection of the protrusions on the display substrate at least partially overlaps with the sub-pixel.

[0032] In one exemplary embodiment of this disclosure, an encapsulation layer group is formed on the light-emitting side of the display substrate, comprising:

[0033] A first organic layer is formed on the light-emitting side of the display substrate;

[0034] The first organic layer is subjected to plasma treatment to form a leveling performance improvement layer on the side of the first organic layer facing away from the display substrate;

[0035] A second organic layer is formed on the side of the leveling performance improvement layer that is away from the display substrate.

[0036] In one exemplary embodiment of this disclosure, the plasma treatment includes fluorination or oxidation.

[0037] According to another aspect of this disclosure, a display device is provided, comprising:

[0038] The display panel is any of the display panels described above.

[0039] The display panel disclosed herein includes, on one hand, a first light enhancement layer disposed on the side of the encapsulation layer assembly facing away from the display substrate. The first light enhancement layer includes multiple protrusions, which can converge the light emitted by the sub-pixels, thereby reducing the emission angle of light rays with large tilt angles and allowing them to exit from the front of the display panel, thus increasing the front light extraction efficiency of the display panel and reducing the power consumption of the display panel; it also reduces color crosstalk between adjacent sub-pixels. On the other hand, the encapsulation layer assembly includes at least two stacked organic film layers, increasing the thickness of the encapsulation layer assembly. This brings the sub-pixel 17 closer to the optimal light extraction position of the protrusion 41, further improving the front light extraction efficiency of the display panel and reducing the power consumption of the display panel.

[0040] It should be understood that the above general description and the following detailed description are exemplary and explanatory only, and are not intended to limit this disclosure. Attached Figure Description

[0041] The accompanying drawings, which are incorporated in and form part of this specification, illustrate embodiments consistent with this disclosure and, together with the description, serve to explain the principles of this disclosure. It is obvious that the drawings described below are merely some embodiments of this disclosure, and those skilled in the art can obtain other drawings based on these drawings without any inventive effort.

[0042] Figure 1 This is a schematic diagram of the structure of a first example embodiment of the display panel of this disclosure.

[0043] Figure 2 This is a schematic diagram showing the dimensional relationship between the protrusions, the encapsulation layer group, and the sub-pixels in the display panel of this disclosure.

[0044] Figure 3 This is a schematic diagram comparing the brightness gain of sub-pixels at the positive viewing angle before and after the increase in the thickness of the simulated encapsulation layer group 2.

[0045] Figure 4 This is a schematic diagram of the structure of a second example embodiment of the display panel of this disclosure.

[0046] Figure 5 This is a schematic diagram of the light path of an example embodiment of the display panel of this disclosure.

[0047] Figure 6 This is a schematic diagram of the structure of a third example embodiment of the display panel of this disclosure.

[0048] Figure 7 This is a schematic diagram of the structure of a fourth example embodiment of the display panel of this disclosure.

[0049] Figure 8 This is a top view schematic diagram of a fifth exemplary embodiment of the display panel of this disclosure.

[0050] Figure 9 This is a schematic diagram of the structure of a sixth example embodiment of the display panel of this disclosure.

[0051] Figure 10 This is a schematic flowchart illustrating an example embodiment of the method for preparing a display panel according to the present disclosure.

[0052] Figures 11-15 This is a schematic diagram of the structure of each step in the fabrication process of the encapsulation layer group in the fabrication method of the display panel disclosed herein.

[0053] Explanation of reference numerals in the attached figures:

[0054] 1. Display substrate; 11. Substrate; 12. Driving backplane; 13. First planarization 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. Subpixel;

[0055] 2. Encapsulation layer group; 21. First inorganic layer; 22. Organic film layer; 22a. First organic layer; 22a1. Recessed structure; 22b. Second organic layer; 22b1. Protruding structure; 23. Leveling performance improvement layer; 24. Second inorganic layer;

[0056] 3. Buffer layer;

[0057] 4. First light enhancement layer; 41. Protrusion;

[0058] 5. Planarization layer; 6. Second light enhancement layer. Detailed Implementation

[0059] Exemplary embodiments will now be described more fully with reference to the accompanying drawings. However, these exemplary embodiments can be implemented in many forms and should not be construed as limited to the embodiments set forth herein; rather, they are provided so that this disclosure will be thorough and complete, and will fully convey the concept of the exemplary embodiments to those skilled in the art. The same reference numerals in the drawings denote the same or similar structures, and therefore detailed descriptions of them will be omitted. Furthermore, the drawings are merely illustrative of this disclosure and are not necessarily drawn to scale.

[0060] Although relative terms such as "up" and "down" are used in this specification to describe the relative relationship of one component of an icon to another, these terms are used only for convenience, such as according to the orientation of the examples shown in the accompanying drawings. It is understood that if the device of the icon is flipped upside down, the component described as "up" will become the component described as "down." When a structure is "up" of another structure, it may mean that the structure is integrally formed on the other structure, or that the structure is "directly" mounted on the other structure, or that the structure is "indirectly" mounted on the other structure through another structure.

[0061] The terms “a,” “one,” “the,” “the,” 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 indicate an open-ended inclusion and to mean that there may be other elements / components / etc. in addition to the listed elements / components / etc.; the terms “first,” “second,” and “third,” etc., are used only as markers and are not a limitation on the number of objects.

[0062] In this application, unless otherwise expressly specified and limited, the term "connection" should be interpreted broadly. For example, "connection" can be a fixed connection, a detachable connection, or an integral part; it can be a direct connection or an indirect connection through an intermediate medium. "And / or" is merely a description of the relationship between related objects, indicating that three relationships can exist. For example, A and / or B can represent: A existing alone, A and B existing simultaneously, or B existing alone. Furthermore, the character " / " in this document generally indicates that the preceding and following related objects have an "or" relationship.

[0063] This disclosure provides an example embodiment of a display panel, with reference to... Figure 1 As shown, 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 disposed 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 disposed on the side of the encapsulation layer group 2 away from the display substrate 1, and the first light enhancement layer 4 includes a plurality of protrusions 41, the orthographic projection of the protrusions 41 on the display substrate 1 at least partially overlaps with the sub-pixels 17.

[0064] The display panel disclosed herein includes, on one hand, a first light enhancement layer 4 disposed on the 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, which can converge the light emitted by the sub-pixels 17, thereby reducing the emission angle of light with a large tilt angle and allowing it to be emitted from the front of the display panel, thus increasing the front light emission efficiency of the display panel and reducing the power consumption of the display panel; it also reduces color crosstalk between two adjacent sub-pixels 17. On the other hand, the encapsulation layer group 2 includes at least two stacked organic film layers 22, which increases the thickness of the encapsulation layer group 2. The protrusions 41 can maximize the front light emission efficiency of the display panel and reduce the power consumption of the display panel.

[0065] 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, which are arranged opposite to each other. The light-emitting side can display an image, and the side displaying the image is the display surface.

[0066] In this example embodiment, taking OLED display substrate 1 as an example, display substrate 1 may include substrate 11, driving backplate 12 and light-emitting device 15, and driving backplate 12 may drive light-emitting device 15 to emit light.

[0067] The driving backplane 12 may include multiple switching units, which may include multiple thin-film transistors, and the multiple switching units are arranged in an array. A first planarization layer 13 is provided on the side of the multiple switching units away from the substrate 11, and the first planarization layer 13 provides a relatively flat base surface for the film layer to be formed subsequently.

[0068] A light-emitting device 15 is disposed on the side of the first planarization layer 13 away from the substrate 11. The light-emitting device 15 may include a first electrode 151, a light-emitting layer group 152, and a second electrode 153.

[0069] Specifically, a first electrode 151 is provided on the side of the first planarization layer 13 away from the substrate 11. The first electrode 151 is connected to the source of the drive backplate 12. The first electrode 151 can be an anode.

[0070] A pixel definition layer 14 is provided on the side of the first electrode 151 facing away from the substrate 11. A via is provided on the pixel definition layer 14, and a light-emitting layer group 152 is provided within the via. A second electrode 153 is provided on the side of the light-emitting layer group 152 facing away from the substrate 11. The second electrode 153 can be a cathode and is connected to the ground line VSS. Light emission from the light-emitting layer group 152 within one via forms a sub-pixel 17. Therefore, the light-emitting layer group 152 within one via is a sub-pixel 17, such that the orthographic projection of the sub-pixel 17 onto the display substrate 1 is the orthographic projection of the light-emitting layer group 152 onto the display substrate 1. The display substrate 1 can include multiple sub-pixels 17.

[0071] 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 sequentially. 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 this disclosure, the light-emitting layer group 152 may only include a hole transport layer, a light-emitting layer, and an electron transport layer. The light-emitting layer group 152 may also have other structures, and its specific structure can be set as needed.

[0072] A light extraction layer 16 (Capping Layer, CPL) can be provided on the light-emitting side of the display substrate 1. The light extraction layer 16 can improve the light emission mode of the display substrate 1, allowing light that was originally confined inside the display substrate 1 to exit the display substrate 1, thus exhibiting higher light extraction efficiency. Of course, the light extraction layer 16 may not be provided.

[0073] An encapsulation layer group 2 is provided on the side of the light extraction layer 16 away from the substrate 11. The encapsulation layer group 2 is used to encapsulate the display substrate 1 to prevent external moisture, impurities, etc. from entering the interior of the display substrate 1 and affecting the display effect of the display substrate 1.

[0074] A first light enhancement layer 4 is disposed 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 projection of the protrusions 41 on the display substrate 1 at least partially overlaps with the sub-pixel 17. For example, the orthographic projection of the protrusions 41 on the display substrate 1 may cover the sub-pixel 17, or the orthographic projection of the protrusions 41 on the display substrate 1 may coincide with the sub-pixel 17, or a portion of the orthographic projection of the protrusions 41 on the display substrate 1 may cover a portion of the sub-pixel 17. The refractive index of the first light enhancement layer 4 is greater than or equal to 1.65.

[0075] The protrusion 41 can converge the light emitted by the sub-pixel 17, so that the emission angle of the light with a large tilt angle is reduced and it 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 also reducing the color crosstalk between two adjacent sub-pixels 17.

[0076] However, experiments showed that the increase in light extraction efficiency through the protrusion 41 of the first light enhancement layer 4 was relatively limited. The inventors discovered that the main reason for this result was that the radius of curvature of the protrusion 41 was relatively large, which caused the sub-pixel 17 to be not placed in the optimal light extraction position of the protrusion 41, thus failing to maximize the light extraction efficiency of the display panel.

[0077] Reference Figure 2 As shown in the figure, Rc is the radius of curvature 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 trigonometric relationship Rc... 2 =(D / 2) 2 +(Rc-H) 2 We can obtain 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.

[0078] Furthermore, the relationship between the focal length of the protrusion 41 and the radius of curvature of the protrusion 41 is fμ = Rc / Δn, where fμ is the focal length of the protrusion 41 and Δn is the difference in refractive index between the material of the protrusion 41 and the material on the side of the protrusion 41 facing away from the encapsulation layer group 2. Typically, Δn is around 0.35, so fμ is approximately 103.5 μm, which is much larger than the current thickness of the encapsulation layer group 2.

[0079] The focal length of the protrusion 41 can be reduced by decreasing the radius of curvature Rc. However, due to current limitations in the fabrication process and film thickness of the protrusion 41, the radius of curvature Rc cannot be reduced. Specifically, when the protrusion 41 is formed by printing, its radius of curvature Rc depends on the hydrophobic properties of the buffer layer 3. Generally, the stronger the hydrophobic properties of the buffer layer 3, the higher the arch of the protrusion 41. However, the material of the buffer layer 3 is generally fixed, 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 of the protrusion 41, the thicker it needs to be, which makes it easy to form a planar structure in the middle part of the protrusion 41, thus making it impossible to converge light.

[0080] Reference Figure 3 As shown, increasing the thickness of the simulated encapsulation layer 2 within a certain range will result in a significant increase in the brightness gain at the positive viewing angle.

[0081] As can be seen from the figure, the thickness of the simulated encapsulation layer group 2 increased from approximately 13.5 μm to approximately 21.5 μm, the positive viewing angle brightness gain of the blue sub-pixel B increased from approximately 123% to approximately 135%, the positive viewing angle brightness gain of the green sub-pixel G increased from approximately 122% to approximately 133%, and the positive viewing angle brightness gain of the red sub-pixel R increased from approximately 121% to approximately 132%, all of which increased by more than 10%.

[0082] In this example 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 organic film layers 22. This makes the sub-pixel 17 closer to the optimal light extraction position of the protrusion 41, so that the front light extraction efficiency of the display panel can be improved to a greater extent through the protrusion 41.

[0083] Referring to Table 1, the light efficiency gain of the green and blue sub-pixels is compared between the conventional thickness of the encapsulation layer group 2 in the prior art (the thickness of the encapsulation layer group 2 is approximately 15 μm) and the increased thickness of the encapsulation layer group 2 in this disclosure (the thickness of the encapsulation layer group 2 is approximately 30 μm).

[0084] Table 1

[0085]

[0086] From Table 1 and Figure 3 It can be seen that the actual effect is consistent with the simulation effect. By increasing the thickness of the encapsulation layer 2, the sub-pixel 17 can be made closer to the optimal light extraction position of the protrusion 41, so that the front light extraction efficiency of the display panel can be improved to a greater extent through the protrusion 41.

[0087] Reference Figure 1 As shown, 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, three, 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 organic film layers 22 are relatively thick, increasing the number of organic film layers 22 can effectively increase the thickness of the encapsulation layer group 2; the inorganic film layers are relatively thin, and even increasing the thickness of the inorganic film layers cannot effectively increase the thickness of the encapsulation layer group 2. Furthermore, the organic film layers 22 are relatively flexible, and even increasing the number of organic film layers 22 has little impact on the bending effect of the display panel; however, the inorganic film layers are relatively brittle, and increasing the thickness or number of inorganic film layers will seriously affect the bending effect of the display panel. Moreover, thicker inorganic film layers are prone to peeling and warping, affecting the display effect of the display panel.

[0088] In this example implementation, refer to Figure 1As shown, the encapsulation layer group 2 may include a first inorganic layer 21, which is disposed on the light-emitting side of the display substrate 1. The material of the first inorganic layer 21 may be SiN (silicon nitride), SiO (silicon oxide), or SiNO (silicon oxynitride), etc.

[0089] 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, etc. 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.

[0090] 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 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.

[0091] The organic film layer 22 is generally formed by printing, that is, the liquid organic material is formed on the light-emitting side of the display substrate 1 by printing. After the liquid organic material is cured, the organic film layer 22 is formed. Therefore, the thickness of the organic film layer 22 printed in one step cannot be too thick. If it is too thick, it will not be easy to cure, which will affect the production efficiency. Even if it is forced to cure, stress concentration is likely to occur. Moreover, if the liquid organic material is too thick, it will cause problems such as overflow and abnormal leveling.

[0092] By forming at least two stacked organic film layers 22 through at least two printing processes, the overall thickness of the organic film layer 22 can be increased by multiples, thereby increasing the thickness of the encapsulation layer group 2.

[0093] The following description uses an example of at least two organic film layers 22. That is, at least two stacked organic film layers 22 may include a first organic layer 22a and a second organic layer 22b.

[0094] The first organic layer 22a is disposed on the light-emitting side of the display substrate 1. Specifically, the first organic layer 22a is disposed 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, etc.

[0095] The refractive index of the first organic layer 22a is approximately 1.4.

[0096] The second organic layer 22b is disposed on the side of the first organic layer 22a away from the display substrate 1, and the second organic layer 22b can be formed by printing.

[0097] Specifically, the refractive index of the second organic layer 22b is approximately 1.65.

[0098] However, the surface of the cured first organic layer 22a has a hydrophobic structure, which is not conducive to the liquid leveling 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, it makes the liquid of the subsequently printed organic material prone to overflow and other problems.

[0099] Furthermore, a leveling performance improvement 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 improvement layer 23 can change the hydrophobicity of the surface of the first organic layer 22a. Specifically, the hydrophilicity of the leveling performance improvement layer 23 is stronger than that of the organic film layer 22 near the display substrate 1; when two organic film layers 22 are provided, the hydrophilicity of the leveling performance improvement layer 23 is stronger than that of the first organic layer 22a. The leveling performance improvement layer 23 enables the liquid of the subsequently formed organic material to be well leveled, thereby resulting in better flatness of the second organic layer 22b after curing, ensuring the display effect of the display panel; and also making it less likely for the liquid of the subsequently formed organic material to overflow or other problems.

[0100] Specifically, refer to Figure 2As shown, the leveling performance improvement layer 23 can be made of inorganic materials, such as SiN (silicon nitride), SiO (silicon oxide), or SiNO (silicon oxynitride), etc. The thickness of the leveling performance improvement 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 improvement layer 23 can 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. 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.

[0101] Of course, in some other exemplary embodiments of this 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 10 μm. For example, the thickness of the leveling performance improvement layer 23 can be 1 μm, 2 μm, 3 μm, 4 μm, 5 μm, 6 μm, 7 μm, 8 μm, 9 μm, etc.

[0102] Furthermore, the refractive index of the organic film layer 22 facing away from the display substrate 1 is greater than that of the leveling performance improvement layer 23, meaning the refractive index of the second organic layer 22b is greater than that of the leveling performance improvement layer 23. For example, the refractive index of the leveling performance improvement layer 23 is approximately 1.6, which is less than the refractive index of the second organic layer 22b (1.65). Similarly, this allows light to exit from a material with a lower refractive index to a material with a higher refractive index, thereby converging the light emitted from the larger angle of inclination towards the forward direction and improving the forward light emission efficiency of the display panel.

[0103] In addition, in some other exemplary embodiments of this disclosure, reference is made to Figure 4 As shown, the leveling performance improvement layer 23 can be a surface fluorinated layer or a surface microstructure layer of the organic film layer 22 closer to the display substrate 1. That is, the leveling performance improvement layer 23 can be a surface fluorinated layer or a surface microstructure layer of the first organic layer 22a. The surface fluorinated layer is formed by F plasma treatment. The surface fluorinated layer can change the hydrophobic properties of the surface of the first organic layer 22a, or it can be said that the surface fluorinated layer has better hydrophilic properties.

[0104] The surface microstructure layer is formed through oxygen ion plasma treatment. Bombarding the surface of the first organic layer 22a with oxygen ions creates an uneven structural layer on the surface of the first organic layer 22a; this uneven structural layer is the surface microstructure layer. The surface microstructure layer can alter the contact angle of the surface of the first organic layer 22a; that is, the contact angle of the surface microstructure layer is smaller, which can also be described as indicating better hydrophilicity of the surface microstructure layer.

[0105] This allows the liquid organic material formed subsequently to flow well through the surface fluorination layer or surface microstructure layer, resulting in a smooth second organic layer 22b after curing, thus ensuring the display effect of the display panel; and also making it less likely for the liquid organic material formed subsequently to overflow or cause other problems.

[0106] Furthermore, the surface fluorinated 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. Therefore, it can slow down the diffusion of water vapor, improve the barrier performance of the encapsulation layer group 2, and thus improve the encapsulation reliability.

[0107] In this case, the thickness of the second organic layer 22b can be made relatively thick. Specifically, the thickness of the second organic layer 22b is greater than or equal to 5 μm and less than or equal to 20 μm. For example, the thickness of the second organic layer 22b can be 5.5 μm, 6 μm, 6.5 μm, 7 μm, 7.5 μm, 8 μm, 8.5 μm, 9 μm, 9.5 μm, 10 μm, 10.5 μm, 11 μm, 11.5 μm, 12 μm, 12.5 μm, 13 μm, 13.5 μm, 14 μm, 14.5 μm, 15 μm, 15.5 μm, 16 μm, 16.5 μm, 17 μm, 17.5 μm, 18 μm, 18.5 μm, 19 μm, 19.5 μm, etc.

[0108] Reference Figure 5 As shown in the diagram, the dashed line represents the contrasting light path. The refractive index of at least two organic film layers 22 increases with the increase of 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 the refractive index 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 the refractive index of the first organic layer 22a, and the refractive index of the third organic film layer 22 is greater than the refractive index of the second organic layer 22b. This ensures that light is emitted from a material with a lower refractive index to a material with a higher refractive index, thereby allowing light rays with a large tilt angle to converge in the forward direction, improving the forward light emission efficiency of the display panel.

[0109] Furthermore, referring to Figures 6-8As shown, a recessed structure 22a1 is provided on the side of the first organic layer 22a near the leveling performance improvement layer 23, that is, a recessed structure 22a1 is provided on the side of the first organic layer 22a away from the display substrate 1, and a protruding structure 22b1 is formed in the portion of the second organic layer 22b located in the recessed portion.

[0110] The recessed structure 22a1 can be formed by imprinting or exposure. Then, a leveling performance improvement layer 23 is formed on the side of the first organic layer 22a that is away from the display substrate 1. Since the leveling performance improvement layer 23 is relatively thin, the recessed structure 22a1 is still retained after the leveling performance improvement layer 23 is formed. The specific structure of the leveling performance improvement layer 23 has been described in detail above, so it will not be repeated here. Finally, a second organic layer 22b is formed on the side of the leveling performance improvement layer 23 that is away from the display substrate 1. A portion of the second organic layer 22b is formed in the recessed portion to form a protruding structure 22b1.

[0111] The protruding structure 22b1 forms a converging lens, which converges the light rays incident on the protruding structure 22b1, so that the exit angle of light rays with a large tilt angle is reduced and they are 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.

[0112] Reference Figure 6 As shown, 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.

[0113] Reference Figure 7 and Figure 8 As shown, Figure 8 Since the protruding structure 22b1 is obscured, it is indicated by a dashed line. In some other exemplary embodiments of this disclosure, the orthographic projection of the plurality of protruding structures 22b1 on the display substrate 1 at least partially overlaps with a sub-pixel 17. That is, the recessed structure 22a1 and the protruding structure 22b1 are set to be small, such that the area of ​​the orthographic projection of the protruding structure 22b1 on the display substrate 1 is smaller than the area of ​​the sub-pixel 17, so that the orthographic projection of the plurality of protruding structures 22b1 on the display substrate 1 can cover a sub-pixel 17.

[0114] Reference Figure 7 As shown, the recessed structure 22a1 and the protruding structure 22b1 may not be provided between adjacent sub-pixels 17. (Refer to...) Figure 8As shown, recessed structures 22a1 and protruding structures 22b1 can also be set between adjacent sub-pixels 17, so that the entire display area of ​​the display panel is provided with recessed structures 22a1 and protruding structures 22b1, which facilitates the design of technicians and simplifies the manufacturing process. It is not necessary to limit the equipment to which areas to form recessed structures 22a1 and protruding structures 22b1, or which areas do not need to form recessed structures 22a1 and protruding structures 22b1.

[0115] In this example implementation, refer to Figure 1 As shown, the encapsulation layer group 2 may further include a second inorganic layer 24, which is disposed on the side of the organic film layer group 22 facing away from the display substrate 1. Specifically, the second inorganic layer 24 is disposed on the 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, and 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. .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.

[0116] The display panel may also include a buffer layer 3, which is disposed on the 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 hydrophobic material. The hydrophobic properties of the buffer layer 3 are related to the morphology of the protrusion 41. Generally, the stronger the hydrophobic properties of the buffer layer 3, the higher the arch of the protrusion 41. The buffer layer 3 can make the protrusion 41 of the first light enhancement layer 4 form a better convex lens morphology, ensuring the light-convex focusing effect of the protrusion 41.

[0117] A planarization layer 5 is disposed 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 that 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, which is greater than or equal to 1.65, as described above. The larger 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 larger Δn in the above formula, the smaller the focal length of the protrusion 41. Therefore, the larger 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 on the focal plane of the protrusion 41. However, if the refractive index of the planarization layer 5 is too small, it makes the selection of the material for the planarization layer 5 more difficult.

[0118] Of course, in some other example embodiments of this disclosure, the planarization layer 5 may not be provided.

[0119] Reference Figure 9 As shown, in some exemplary embodiments of this disclosure, the display panel may further include a second light enhancement layer 6, which is disposed between the first light enhancement layer 4 and the encapsulation layer group 2. Specifically, the second light enhancement layer 6 is disposed 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. This allows light emitted from the second inorganic layer 24 to strike the second light enhancement layer 6 from a less dense medium to a denser medium. Light with a larger tilt angle will be refracted towards the center and 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.

[0120] Based on the same inventive concept, this disclosure provides an example embodiment of a method for manufacturing a display panel, referring to... Figure 10 As shown, the preparation method may include the following steps:

[0121] Step S10: Provide a display substrate 1, which includes a plurality of sub-pixels 17.

[0122] Step S20: An encapsulation layer group 2 is formed on the light-emitting side of the display substrate 1. The encapsulation layer group 2 includes at least two stacked organic film layers 22.

[0123] Step S30: A first light enhancement layer 4 is formed on the side of the encapsulation layer group 2 away from the display substrate 1. The first light enhancement layer 4 includes a plurality of protrusions 41. The orthographic projection of the protrusions 41 on the display substrate at least partially overlaps with the sub-pixel 17.

[0124] Reference Figure 11As shown, a display substrate 1 is provided. The method for preparing the display substrate 1 is a method in the prior art, so it will not be described in detail here.

[0125] Forming an encapsulation layer group 2 on the light-emitting side of the display substrate 1 may include: (referring to...) Figure 12 As shown, a first inorganic layer 21 is formed on the light-emitting side of the display substrate 1 using processes such as chemical vapor deposition; a first organic layer 22a is formed on the side of the first inorganic layer 21 facing away from the display substrate 1 using processes such as printing and coating. (Refer to...) Figure 13 As shown, the first organic layer 22a is subjected to plasma treatment 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 chain 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 fluorination layer to change the hydrophobic properties of the entire surface of the first organic layer 22a.

[0126] Of course, plasma treatment can include plasma treatment using oxygen ions, where oxygen ions bombard the surface of the first organic layer 22a to form an uneven structural layer on the surface of the first organic layer 22a. This uneven structural layer is a surface microstructure layer, thereby improving the contact angle of the first organic layer 22a.

[0127] Reference Figure 14 As shown, a second organic layer 22b is then formed on the side of the leveling performance improvement layer 23 facing away from the display substrate 1 through processes such as printing and coating. The leveling performance improvement layer 23 enables the liquid organic material to be formed subsequently to flow well, thereby resulting in a better flatness of the second organic layer 22b after curing, thus ensuring the display effect of the display panel.

[0128] Of course, refer to Figure 15 As shown, after the formation of the second organic layer 22b, 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 existing technologies, so they will not be described in detail here.

[0129] The formation process of the first light enhancement layer 4 is a process in the prior art, so it will not be described in detail here.

[0130] It should be noted that although the steps of the method for preparing the display panel in this disclosure are described in a specific order in the accompanying drawings, this does not require or imply that these steps must be performed in that specific order, or that all the steps shown must be performed to achieve the desired result. Additional or alternative steps may be omitted, multiple steps may be combined into one step, and / or one step may be broken down into multiple steps.

[0131] Based on the same inventive concept, this disclosure provides a display device that may include the display panel described in any of the above-described embodiments. The specific structure of the display panel has been described in detail above, and therefore will not be repeated here.

[0132] The specific type of display device is not particularly limited; any type of display device commonly used in the field is acceptable, such as mobile devices like mobile phones, wearable devices like watches, VR devices, etc. Those skilled in the art can make the appropriate selection based on the specific purpose of the display device, which will not be elaborated further here.

[0133] It should be noted that, in addition to the display panel, the display device also includes other necessary components and parts. Taking the monitor as an example, these include, for instance, the casing, circuit board, power cord, etc. Those skilled in the art can supplement these components according to the specific usage requirements of the display device, and will not be elaborated here.

[0134] Compared with the prior art, the beneficial effects of the display device provided by the example embodiments of the present invention are the same as the beneficial effects of the display panel provided by the example embodiments described above, and will not be repeated here.

[0135] Other embodiments of this disclosure will readily occur to those skilled in the art upon consideration of the specification and practice of the invention disclosed herein. This application is intended to cover any variations, uses, or adaptations of this disclosure that follow the general principles of this disclosure and include common knowledge or customary techniques in the art not disclosed herein. The specification and examples are to be considered exemplary only, and the true scope and spirit of this disclosure are indicated by the appended claims.

Claims

1. A display panel, characterized in that, include: The display substrate includes multiple sub-pixels; An encapsulation layer assembly is disposed on the light-emitting side of the display substrate, and the encapsulation layer assembly includes at least two stacked organic film layers; A first light enhancement layer is disposed on the side of the encapsulation layer group opposite to the display substrate. The first light enhancement layer includes a plurality of protrusions, and the orthographic projection of the protrusions on the display substrate at least partially overlaps with the sub-pixel. A leveling performance improvement layer is provided between two adjacent organic film layers; The hydrophilicity of the leveling performance improvement layer is stronger than that of the organic film layer adjacent to and closer to the display substrate; the leveling performance improvement layer is a surface microstructure layer of the organic film layer closer to the display substrate.

2. The display panel according to claim 1, characterized in that, The refractive index of the organic film layer adjacent to the leveling performance improvement layer and further away from the display substrate is greater than or equal to the refractive index of the leveling performance improvement layer.

3. The display panel according to claim 1, characterized in that, The refractive index of at least two of the organic film layers increases with increasing distance from the display substrate.

4. The display panel according to any one of claims 2 to 3, characterized in that, The at least two organic film layers comprise: A first organic layer is disposed on the light-emitting side of the display substrate, and the leveling performance improvement layer is disposed on the side of the first organic layer opposite to the display substrate. The second organic layer is disposed on the side of the leveling performance improvement layer away from the display substrate; The first organic layer has a recessed structure on the side near the leveling performance improvement layer, and the portion of the second organic layer located within the recessed structure forms a protruding structure.

5. The display panel according to claim 4, characterized in that, The orthographic projection of one of the protruding structures on the display substrate at least partially overlaps with one of the sub-pixels, or the orthographic projections of multiple protruding structures on the display substrate at least partially overlap with one of the sub-pixels.

6. The display panel according to any one of claims 1 to 3, characterized in that, The display panel also includes: A second light enhancement layer is disposed between the first light enhancement layer and the encapsulation layer group, wherein 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.

7. The display panel according to any one of claims 1 to 3, characterized in that, The display panel also includes: A buffer layer is disposed on the side of the first light enhancement layer near the encapsulation layer group, and the buffer layer is made of a hydrophobic material; A planarization layer is disposed on the side of the first light enhancement layer opposite to the display substrate, wherein the refractive index of the first light enhancement layer is greater than the refractive index of the planarization layer.

8. The display panel according to any one of claims 1 to 3, characterized in that, 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 disposed between the display substrate and the organic film layer group; The second inorganic layer is disposed on the side of the organic film layer group opposite to the display substrate.

9. A method for manufacturing a display panel, characterized in that, include: A display substrate is provided, the display substrate comprising a plurality of sub-pixels; An encapsulation layer group is formed on the light-emitting side of the display substrate, the encapsulation layer group comprising at least two stacked organic film layers; A first light enhancement layer is formed on the side of the encapsulation layer group opposite to the display substrate. The first light enhancement layer includes a plurality of protrusions, and the orthographic projection of the protrusions on the display substrate at least partially overlaps with the sub-pixel. An encapsulation layer assembly is formed on the light-emitting side of the display substrate, comprising: A first organic layer is formed on the light-emitting side of the display substrate; The first organic layer is subjected to plasma treatment to form a leveling performance improvement layer on the side of the first organic layer facing away from the display substrate; A second organic layer is formed on the side of the leveling performance improvement layer that is away from the display substrate; The plasma treatment includes bombarding the surface of the first organic layer with oxygen plasma to form an uneven structural layer on the surface of the first organic layer, which is a surface microstructure layer.

10. A display device, characterized in that, include: The display panel is the display panel described in any one of claims 1 to 8.

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