Display panel and display device

Abstract

The invention provides a display panel and display equipment. The display panel comprises a substrate layer, a pixel unit and a micro lens layer which are stacked. The micro-lens layer is located on the side, back to the base material layer, of the pixel unit, the micro-lens layer comprises a low-refraction layer and a high-refraction layer, and the refractive index of the high-refraction layer is larger than that of the low-refraction layer; the pixel units form a first projection on the substrate layer, and the first projection comprises four straight edges; the through hole is provided with a first opening close to the plurality of pixel units, the first opening forms a second projection on the substrate layer, the second projection covers the first projection, the second projection comprises four curved edges, the four curved edges surround the periphery of the first projection and are arranged in one-to-one correspondence with the four straight edges, and the curved edges are recessed in the direction close to the straight edges. By designing the shape of the first opening, the light utilization rate of the display panel can be improved, and the luminance in a visual angle can be greatly improved.

Description

Technical Field

[0001] This application relates to the field of display technologies, and particularly to a display panel and a display device. Background Art

[0002] In order to improve the luminous brightness of an OLED (Organic Light Emitting Diode) display panel, a micro lens array (MLA) technology is generally adopted. The micro lens array technology can improve the luminous brightness of the display panel without increasing the power consumption of the display panel. However, the current micro lens array has a low utilization rate of the light emitted by the light-emitting device, resulting in a limited increase in the luminous brightness of the display panel. Summary of the Invention

[0003] Embodiments of this application provide a display panel and a display device including the display panel. The display panel has a high utilization rate of light, can significantly improve the luminous brightness within the visible viewing angle, improve the luminous efficiency, and is beneficial to reducing the power consumption of the display panel.

[0004] In a first aspect, this application provides a display panel. The display panel includes a substrate layer, a plurality of pixel units, and a microlens layer. The plurality of pixel units are located on the same side of the substrate layer; the microlens layer is located on the side of the plurality of pixel units facing away from the substrate layer. The microlens layer includes a low-refractive-index layer and a high-refractive-index layer. The low-refractive-index layer is provided with a plurality of through holes arranged at intervals. The refractive index of the high-refractive-index layer is greater than that of the low-refractive-index layer. The high-refractive-index layer includes a flat layer and a plurality of protrusions. The flat layer is located on the side of the low-refractive-index layer facing away from the plurality of pixel units. The plurality of protrusions are respectively located in the plurality of through holes; wherein, the pixel unit forms a first projection on the substrate layer, the first projection is rectangular or rounded rectangular, and the first projection includes four straight sides; the through hole has a first opening close to the plurality of pixel units, the first opening forms a second projection on the substrate layer, the second projection covers the first projection, the second projection includes four curved sides, the four curved sides surround the first projection and are arranged in one-to-one correspondence with the four straight sides, and the curved sides are recessed in the direction close to the straight sides.

[0005] In the embodiments of the present application, the refractive index of the protrusion can be greater than that of the low-refractive-index layer. According to the law of total internal reflection, a part of the light rays with larger exit angles emitted from the pixel unit do not directly irradiate the corresponding area above the pixel unit, but will be totally reflected back into the protrusion on the surface at the junction of the protrusion and the low-refractive-index layer. Thus, by setting the protrusion, the optical path and exit angle of this part of the light rays can be changed, prompting the exit direction of this part of the light rays to converge towards the front view angle of the display panel, and being able to exit from the front view angle or a nearly front view angle of the light-emitting surface. Thereby, the visible brightness of the light-emitting surface of the display panel can be increased by about 10%, effectively improving the light-emitting efficiency of the display panel, and also being beneficial to saving the energy consumption of the display panel and increasing the service life of the display panel.

[0006] Among them, by setting the shape of the second projection to be different from that of the first projection, in this embodiment, by setting the second projection to cover the first projection and the four curved sides of the second projection to be recessed towards the four straight sides of the first projection respectively, the perimeter of the second projection can be increased. That is, in the embodiments of the present application, the shape of the first opening can be changed to change the shape of the first surface (the surface of the protrusion facing the pixel unit that is adapted to the first opening), increase the perimeter of the first surface, and thereby increase the area of the third surface (the surface in the protrusion that effectively adjusts the optical path), so that more light rays with larger exit angles can reach the third surface for total internal reflection, increasing the area of the surface in the protrusion that effectively adjusts the optical path, enabling more light rays with larger exit angles to converge towards the front view angle of the display panel, thereby reducing the luminous brightness of the large view angle (the area corresponding to the light rays with larger exit angles) on the display panel and increasing the luminous brightness of the small view angle (the area corresponding to the light rays with smaller exit angles), so as to more effectively improve the display brightness of the front view angle of the display panel, adjust the light pattern distribution, achieve the adjustment of the view angle brightness decay, and contribute to improving the user experience of the display device. In addition, during the process of manufacturing the display panel, by adjusting the shape of the mask, the desired shape of the first opening can be obtained without additionally adding other components or processes, and thereby the desired shape of the corresponding protrusion can be obtained, realizing a greater increase in the brightness of the display panel. The manufacturing process is relatively simple and the manufacturing cost is low, which is beneficial to realizing the large-scale production of the display panel.

[0007] In addition, in this embodiment, by adaptively adjusting the shape or size of the first opening corresponding to different pixel units, etc., it is also beneficial to improve the coordination between different pixel units that emit lights of different colors in the display panel, thereby improving the color shift effect and being able to improve the user experience.

[0008] In some possible embodiments, the minimum distance between the curved edge and the corresponding straight edge is in the range of 0 μm to 3 μm. Exemplarily, the minimum distance between the curved edge and the corresponding straight edge can be values such as 0 μm, 1 μm, 2 μm, or 3 μm. By setting the minimum distance between the curved edge and the corresponding straight edge to be greater than or equal to 0, it is ensured that the projection of the first opening on the substrate layer can cover the pixel unit. The greater the minimum distance between the curved edge and the corresponding straight edge, the more light can enter the protrusion, which is used to better improve the brightness of the positive viewing angle of the display panel. In addition, by setting the minimum distance between the curved edge and the corresponding straight edge to be less than or equal to 3 μm, it is possible to avoid the distance between the curved edge and the corresponding straight edge being too large, which affects the total internal reflection effect of the protrusion on light, thereby reducing the benefit.

[0009] In some possible embodiments, the ratio of the radius of the curved edge to the side length of the straight edge is in the range of 0.5 to 0.9. Exemplarily, the ratio of the radius of the curved edge to the side length of the straight edge can be 0.5, 0.6, 0.7, 0.85, or 0.9, etc. By adjusting the ratio of the radius of the curved edge to the side length of the straight edge, the area of the third surface is increased, so that more light can undergo total internal reflection on it, while considering the total internal reflection effect of the third surface on light when improving the brightness of the display panel.

[0010] In some possible embodiments, the degree of the central angle of the curved edge is in the range of 60° to 120°. Exemplarily, the degree of the central angle of the curved edge can be 60°, 65°, 75°, 90°, 105°, or 120°, etc. By adjusting the degree of the central angle of the curved edge, that is, by adjusting the shape of the first opening, the perimeter of the first opening is increased, thereby correspondingly increasing the perimeter of the first surface, increasing the area of the third surface, so that more light undergoes total internal reflection on it, while considering the total internal reflection effect of the third surface on light when improving the brightness of the display panel.

[0011] In some possible embodiments, the side lengths of the four straight edges are equal, the degrees of the central angles of the four curved edges are all 90°, and the ratio of the radius of the curved edge to the side length of the straight edge is In the embodiments of the present application, the first projection may be square, and the side lengths of two adjacent straight edges of the first projection may be equal. In other embodiments, the first projection may also be rectangular or other shapes, and the side lengths of two adjacent straight edges of it may also be unequal.

[0012] In some possible embodiments, the second projection further includes four connecting edges. In the circumferential direction of the second projection, the four connecting edges and the four curved edges are alternately arranged and connected. The connecting edges are curved edges or straight edges that are concave towards the first projection. The connecting edges can be connected between two adjacent curved edges so that the second projection forms a continuous closed shape. By providing the connecting edges, the perimeter of the second projection can also be increased, so as to increase the perimeter of the first opening, thereby correspondingly increasing the perimeter of the first surface and increasing the area of the third surface, so that more light can undergo total internal reflection on the third surface, and the exit angles of more light can approach the front view angle of the display panel, which is beneficial to improving the light concentration effect of the microlens layer, and thus effectively improving the brightness of the display panel.

[0013] In some possible embodiments, the minimum distance between the connecting edge and the first projection is in the range of 0 μm to 3 μm. Exemplarily, it can be 0 μm, 1 μm, 2 μm, or 3 μm, etc. By setting the minimum distance between the connecting edge and the first projection to be greater than or equal to 0, it is ensured that the projection of the first opening on the substrate layer can cover the pixel unit. The greater the minimum distance between the connecting edge and the first projection, the larger the area of the second projection. Correspondingly, the area of the surface of the protrusion facing the pixel unit is larger, so that more light can enter the protrusion to improve the visible brightness and luminous efficiency of the display panel. In addition, by setting the minimum distance between the connecting edge and the first projection to be less than or equal to 3 μm, the aim is to avoid too large a distance between the connecting edge and the first projection, which affects the total internal reflection effect of the protrusion on light, thereby reducing the benefit.

[0014] In some possible embodiments, the degree of the central angle of the connecting edge is greater than 0° and less than or equal to 180°. Exemplarily, the degree of the central angle of the connecting edge can be 10°, 90°, or 180°, etc., so as to increase the area of the third surface, make more light undergo total internal reflection on the third surface, and improve the brightness of the display panel while taking into account the total internal reflection effect of light in the microlens layer.

[0015] In some possible embodiments, the refractive index of the low-refractive-index layer is in the range of 1.4 to 1.6; and / or, the refractive index of the high-refractive-index layer is in the range of 1.6 to 1.9; and / or, in the direction perpendicular to the substrate layer, the size of the low-refractive-index layer is in the range of 2 μm to 6 μm; and / or, in the direction perpendicular to the substrate layer, the size of the high-refractive-index layer is in the range of 5 μm to 20 μm.

[0016] For example, the refractive index of the low-refractive-index layer can be, but is not limited to, 1.4, 1.45, 1.5, etc., and the refractive index of the high-refractive-index layer can be, but is not limited to, 1.6, 1.65, 1.7, 1.85, etc. By adjusting the refractive indices of the high-refractive-index layer and the low-refractive-index layer, as many light rays as possible at larger angles can undergo total internal reflection on the third surface, so that while changing the light path, the light can be irradiated onto the light-emitting surface at an appropriate range of exit angles, ensuring the brightness of the display panel and also being beneficial to reducing the power consumption of the display panel.

[0017] Among them, the thickness of the low-refractive-index layer can be values such as 2μm, 4μm, 5μm, or 6μm. By setting the value range of the thickness of the low-refractive-index layer, it can not only avoid the situation where when the thickness of the low-refractive-index layer is less than 2μm, the area and other related quantities of the third surface are too small, resulting in a decrease in the number of light rays that can undergo total internal reflection on the third surface, thus affecting the brightening effect of the microlens layer, but also improve the problem of difficult processing caused by the too-thin film layer; in addition, it can also avoid the situation where when the thickness of the low-refractive-index layer is greater than 6μm, the overall thickness of the display panel is relatively large, affecting the realization of the thin and light display panel.

[0018] Among them, the thickness of the high-refractive-index layer can be values such as 5μm, 10μm, 15μm, or 20μm. By setting the value range of the thickness of the high-refractive-index layer, it can not only avoid problems such as when the high-refractive-index layer is too thick, the optical path of the light rays in the microlens layer is too long, and the absorption rate of the microlens layer to the light rays is relatively large, thus affecting the luminous efficiency of the display panel, and the too-thick high-refractive-index layer will also increase the overall thickness of the display panel, which is not conducive to the realization of the thin and light display panel; but also avoid problems such as when the high-refractive-index layer is too thin, the reflection process of the light rays in it cannot be realized, the effective brightening effect cannot be achieved, and the manufacturing difficulty is large.

[0019] In some possible implementation manners, the degree of the angle between the first opening and the surface of the low-refractive-index layer facing the substrate layer is within the range of 50° to 90°. Exemplarily, the angle can be 50°, 60°, 80°, 90°, etc. When the degree of the angle is close to 50°, the inclination degree of the side wall adjacent to the first opening and the surface of the low-refractive-index layer facing the substrate layer can be increased, thereby correspondingly increasing the inclination degree of the third surface relative to the first surface, so as to increase the surface area of the third surface, enabling as many light rays with larger exit angles as possible to reach the third surface and undergo total internal reflection thereon, and the optical paths of more light rays with larger exit angles can be changed, converging at the light-emitting surface of the display panel at a smaller exit angle, effectively improving the light-emitting efficiency of the display panel. When the value of the angle is close to 90°, the light rays emitted from the microlens layer can be made to converge as much as possible towards the front view angle of the display panel, improving the degree of light convergence and effectively improving the brightness of the front view angle of the display panel.

[0020] In some possible embodiments, the display panel further includes a packaging layer located between the microlens layer and the plurality of pixel units. In a direction perpendicular to the substrate layer, the distance between the first opening and the pixel unit ranges from 10 μm to 15 μm. Exemplarily, it can be 10 μm, 12 μm, 14 μm, 15 μm, etc., which can reduce the thickness of the display panel while ensuring the packaging effect of the packaging layer, facilitating the realization of the thin and light display panel.

[0021] In some possible embodiments, the display panel further includes a packaging layer. The packaging layer includes a first packaging layer and a second packaging layer arranged at intervals. The first packaging layer and the second packaging layer are respectively connected to opposite side surfaces of the microlens layer, and the first packaging layer is located between the microlens layer and the plurality of pixel units. At least one of the first packaging layer, the second packaging layer, and the microlens layer includes an organic layer and an inorganic layer. In a direction perpendicular to the substrate layer, the distance between the first opening and the pixel unit ranges from 2 μm to 5 μm. Exemplarily, the first packaging layer can be made of inorganic materials such as silicon dioxide, silicon nitride, or aluminum oxide, the second packaging layer can be made of inorganic materials such as silicon dioxide, silicon nitride, or aluminum oxide, and the microlens layer can be made of organic materials such as organic glass. The first packaging layer, the microlens layer, and the second packaging layer can form a three-layer structure with inorganic layer, organic layer, and inorganic layer stacked. Among them, the first packaging layer and the second packaging layer mainly play a role in water and oxygen isolation. By setting the microlens layer between the first packaging layer and the second packaging layer, it can play a certain water and oxygen buffering role to release stress and improve the flexibility and connection reliability between the two inorganic structure layers of the first packaging layer and the second packaging layer.

[0022] In addition, the microlens layer can also play a multiplexing role, which is beneficial to reducing the number of inner film layers in the display panel, reducing the distance between the first opening and the pixel unit, and reducing the number of other film layers in the display panel that the light emitted from the pixel unit passes through before reaching the first opening, thereby reducing the optical loss caused by reflection or refraction of light, and being beneficial to improving the light extraction efficiency of the display panel.

[0023] In addition, by setting the distance between the first opening and the pixel unit in the range of 2 μm to 5 μm, for example, 2 μm, 3 μm, or 5 μm, etc., more light can be made to enter the microlens layer to improve the brightness of the display panel while taking into account the process manufacturing difficulty.

[0024] In a second aspect, an embodiment of the present application further provides a display device, including the display panel according to any one of the above and a housing, and the display panel is installed in the device housing. The display panel in this display device has a high luminous efficiency, can have a strong front view angle brightness without increasing power consumption, has a good display effect, and is beneficial to improving the user experience of using the display device. Description of the Drawings

[0025] Figure 1 is a schematic structural diagram of a display device provided by an embodiment of the present application;

[0026] Figure 2 is Figure 1 a partial cross-sectional structural diagram of the display panel shown in some embodiments;

[0027] Figure 3 is Figure 2 a top view structural diagram of the low refractive index layer shown;

[0028] Figure 4 is Figure 2 a top view structural diagram of the high refractive index layer shown;

[0029] Figure 5 is Figure 2 a projection structural diagram of the first opening and the pixel unit shown on the display panel;

[0030] Figure 6 is Figure 2 a partial optical path structural diagram of the display panel shown;

[0031] Figure 7 is Figure 5 a schematic diagram of a first projection and a second projection shown in;

[0032] Figure 8 a relationship diagram of the brightness and the exit angle of a display panel provided by an embodiment of the present application;

[0033] Figure 9 is a structural diagram of another first projection and second projection provided by an embodiment of the present application;

[0034] Figure 10 is a structural diagram of another first projection and second projection provided by an embodiment of the present application;

[0035] Figure 11 is a structural diagram of a first projection and a second projection provided by another embodiment;

[0036] Figure 12 is a cross-sectional schematic diagram of a display panel provided by another embodiment. Detailed Description of the Embodiments

[0037] The embodiments of the present application will be described below with reference to the accompanying drawings in the embodiments of the present application.

[0038] In the description of the embodiments of the present application, it should be noted that unless otherwise clearly specified and limited, the terms "installation" and "connection" should be understood in a broad sense. For example, "connection" can be a direct connection or an indirect connection through an intermediate medium. The orientation terms mentioned in the embodiments of the present application, such as "upper", "lower", "inner", "outer", etc., are only with reference to the direction of the accompanying drawings. Therefore, the orientation terms used are for better and clearer description and understanding of the embodiments of the present application, rather than indicating or implying that the device or component referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus should not be construed as a limitation to the embodiments of the present application.

[0039] In the embodiments of the present application, the terms "first" and "second" are only used for descriptive purposes and should not be construed as indicating or implying relative importance or implicitly specifying the quantity of the indicated technical features. Thus, the features defined with "first" and "second" may explicitly or implicitly include one or more of such features. "Plurality" means at least two.

[0040] In addition, in the embodiments of the present application, mathematical concepts such as parallel and perpendicular are mentioned. These limitations are all in view of the current technological level and are not absolute strict definitions in the mathematical sense. A small deviation is allowed, and approximate parallelism, approximate perpendicularity, etc. are all acceptable. For example, when A is parallel to B, it means that A is parallel or approximately parallel to B, and the included angle between A and B can be between 0 degrees and 10 degrees. For example, when A is perpendicular to B, it means that A is perpendicular or approximately perpendicular to B, and the included angle between A and B can be between 80 degrees and 100 degrees.

[0041] It can be understood that the specific embodiments described herein are only used to explain the related invention and are not a limitation to the invention. Additionally, it should be noted that for the convenience of description, only the parts related to the invention are shown in the drawings.

[0042] Please refer to Figure 1 , Figure 1 which is a schematic structural diagram of a display device 100 provided by the embodiments of the present application.

[0043] In some embodiments, the display device 100 can be a mobile phone, a tablet personal computer, a laptop computer, a television, a smart screen, a personal digital assistant (PDA), a camera, a personal computer, a notebook computer, a vehicle-mounted device, a wearable device, an augmented reality (AR) glasses, an AR helmet, a virtual reality (VR) glasses or a VR helmet, etc., any product or component with a display function.Figure 1 The display device 100 of the illustrated embodiment is described by taking a mobile phone as an example.

[0044] In some embodiments, the display device 100 may include a housing 10 and a display panel 20, and the display panel 20 is installed in the housing 10.

[0045] Among them, the housing 10 may include a frame 11 and a rear cover ( Figure 1 not shown in the figure). The rear cover is fixed to the frame 11. Exemplarily, the rear cover may be fixedly connected to the frame 11 by means of glue, snap connection, etc. The rear cover and the frame 11 may also be an integrally formed structure, that is, the rear cover and the frame 11 are a whole structure.

[0046] In some embodiments, the display panel 20 may be fixed to the side of the frame 11 away from the rear cover. At this time, the display panel 20 and the rear cover may be located on both sides of the frame 11 respectively. The display panel 20, the frame 11 and the rear cover jointly enclose the interior of the display device 100. The interior of the display device 100 may be used to place other structural components in the display device 100, such as a battery, etc.

[0047] Among them, the display panel 20 may be an organic light emitting diode (OLED) display panel, a flexible light emitting diode (FLED) display panel, or a quantum dot light emitting diode (QLED) display panel, etc. The present application does not limit this either. In the embodiments of the present application, the display panel 20 is taken as an organic light emitting diode (OLED) display panel as an example for introduction.

[0048] It should be noted that Figure 1 only some components included in the display device 100 are schematically shown, and the actual shapes, actual sizes, actual positions and actual structures of these components are not limited by Figure 1 this. In addition, when the display device 100 is a device in some other forms, the display device 100 may not include the housing 10 or the housing 10 may present other forms.

[0049] Among them, the display device 100 may also include a battery ( Figure 1 not shown in the figure), a camera ( Figure 1 not shown in the figure) and a processor ( Figure 1One or more of the components (not shown in the figure), etc. Exemplarily, the display device 100 may further include a battery, a camera, and a processor. The battery and the processor are both installed inside the display device 100, and the camera is installed inside the display device 100 and can take pictures through the through hole on the back cover. The processor may be electrically connected to the battery, the camera, and the display panel 20. The processor may be a central processing unit, or may also be other general-purpose processors, digital signal processors, image processors, etc. The processor is the control center of the display device and can connect and control various parts of the display device using various interfaces and lines. For example, the processor may be electrically connected to the display panel 20 to control the display process of the display panel 20; for example, the processor may be electrically connected to the battery to control the charging and / or discharging process of the battery; for example, the processor may be electrically connected to the camera to control the photographing process and / or the video recording process of the camera.

[0050] Please refer to Figure 2 , Figure 2 is Figure 1 The partial cross-sectional structure schematic diagram of the display panel 20 shown in some embodiments.

[0051] It can be understood that for the convenience of description in the following text, it is defined that the display panel 20 has a first direction Z, and the first direction Z may be parallel to the thickness direction of the display panel 20. In addition, the first direction Z may also be the front light-emitting direction of the display panel 20. The display panel 20 also has a light-emitting surface 201, and the user can obtain a display image through the light-emitting surface 201 of the display panel 20, and the first direction Z may be perpendicular to the light-emitting surface 201 of the display panel 20.

[0052] In some embodiments, as Figure 2 shown, the display panel 20 may include a substrate layer 21, a pixel definition layer 22, a plurality of pixel units 24, and a microlens layer 23.

[0053] Exemplarily, the substrate layer 21 may serve as a carrier to carry other film layers inside the display panel 20. Exemplarily, the substrate layer 21 may be made of glass materials such as soda lime glass, quartz glass, sapphire glass, etc., or may also be made of metal materials such as stainless steel, aluminum, nickel, etc., and may also be a flexible substrate, for example, made of materials such as polyimide (abbreviated as PI), etc. The embodiments of the present application do not limit this.

[0054] Exemplarily, the pixel definition layer 22 may be located on one side of the substrate layer 21. A plurality of pixel units 24 ( Figure 2It is shown in the figure that one of the pixel units 24) is embedded in the pixel definition layer 22. At this time, multiple pixel units 24 are located on the same side of the substrate layer 21. Among them, the pixel unit 24 can be a light-emitting device such as an organic light-emitting diode, an inorganic light-emitting diode, a quantum dot light-emitting diode, or a perovskite light-emitting diode. Among them, each pixel unit 24 can emit light of one color. For example, it can be one of red light, blue light, or green light, etc. Exemplarily, multiple pixel units 24 can emit lights of different colors in sequence to present different display images or light effects, meeting different display requirements of the display panel 20.

[0055] Among them, the pixel definition layer 22 can surround the periphery of the pixel unit 24, and the surface of the pixel unit 24 facing away from the substrate layer 21 can be exposed relative to the pixel definition layer 22. The pixel definition layer 22 is made of a material that can absorb visible light. Exemplarily, the pixel definition layer 22 can be made of a photosensitive material such as photosensitive polyimide (PSPI) or black photosensitive resin, etc.

[0056] In some examples, the light emitted by the pixel unit 24 will propagate around the pixel unit 24. By arranging the pixel unit 24 inside the pixel definition layer 22, the pixel definition layer 22 can absorb the light emitted from the side of the pixel unit 24, so that the light is emitted from the surface of the pixel unit 24 facing away from the substrate layer 21 (corresponding to Figure 2 the top surface of the pixel unit 24 in the figure), and it can also avoid crosstalk between the lights of different colors emitted by different pixel units 24 in the display panel 20. In some examples, the pixel definition layer 22 can also absorb the external ambient light reaching the pixel definition layer 22, avoiding the reflection of the external ambient light in the display panel 20. In other embodiments, the display panel 20 may not include the pixel definition layer 22, and the present application does not limit this.

[0057] Exemplarily, the microlens layer 23 is located on the side of the pixel definition layer 22 facing away from the substrate layer 21. At this time, the microlens layer 23 is located on the side of multiple pixel units 24 facing away from the substrate layer 21. In some examples, the first direction Z can be perpendicular to the substrate layer 2, and the substrate layer 21, the pixel definition layer 22, and the microlens layer 23 are arranged in sequence in the first direction Z.

[0058] In some embodiments, such as Figure 2As shown, the microlens layer 23 may include a low-refractive-index layer 231 and a high-refractive-index layer 232. The first refractive index n1 of the high-refractive-index layer 232 may be greater than the second refractive index n2 of the low-refractive-index layer 231. Herein, the first refractive index n1 of the high-refractive-index layer 232 is relatively high with respect to the second refractive index n2 of the low-refractive-index layer 231. The naming of the high-refractive-index layer 232 and the low-refractive-index layer 231 does not indicate or imply that the high-refractive-index layer 232 or the low-refractive-index layer 231 must have a specific refractive-index range, and thus should not be construed as a limitation on the embodiments of the present application. Herein, the high-refractive-index layer 232 and the low-refractive-index layer 231 may be substantially in a stacked relationship. For example, the low-refractive-index layer 231 and the high-refractive-index layer 232 may be stacked in the first direction Z.

[0059] Exemplarily, both the high-refractive-index layer 232 and the low-refractive-index layer 231 may be made of one or more of materials such as epoxy-based organic materials, acrylic-based organic materials, or polymethyl methacrylate (PMMA). Herein, the refractive index can be adjusted by doping particles into the materials. For example, the high-refractive-index layer 232 may be doped with organic polymer materials such as thermoplastic elastomer (TPE), titanium dioxide nanoparticles, or metal oxane, so that the first refractive index n1 of the high-refractive-index layer 232 is greater than the second refractive index n2 of the low-refractive-index layer 231.

[0060] Please refer to Figure 2 and Figure 3 , Figure 3 is Figure 2 a top-view structural schematic diagram of the low-refractive-index layer 231 shown. Herein, the top view refers to the direction in which the line of sight is from the light-emitting surface 201 of the display panel 20 to the inside of the display panel 20.

[0061] In some embodiments, a plurality of through holes 25 arranged at intervals may be provided in the low-refractive-index layer 231. Herein, in the first direction Z, the through holes 25 may penetrate through the low-refractive-index layer 231. The low-refractive-index layer 231 may include a plurality of microlenses 2311. The plurality of microlenses 2311 are connected to each other as a whole and may be an integrally formed structural member. One microlens 2311 is provided between any two adjacent through holes 25. In some examples, the plurality of through holes 25 may be arranged in an array. In the row direction of the array, microlenses 2311 are arranged on both sides of each through hole 25. In the column direction of the array, microlenses 2311 are also arranged on both sides of each through hole 25.

[0062] Exemplarily, the through hole 25 may have a first opening 251 and a second opening 252. The first opening 251 and the second opening 252 are opposite sides of the through hole 25 in the first direction Z, and the first opening 251 is closer to the pixel unit 24 than the second opening 252. Wherein, the through hole 25 may further have a side wall 253. The side wall 253 is the hole wall of the through hole 25, and the side wall 253 is connected between the first opening 251 and the second opening 252. Wherein, the side wall 253 may be jointly formed by the surfaces of a plurality of microlenses 2311 facing the through hole 25.

[0063] Exemplarily, the area of the second opening 252 may be larger than the area of the first opening 251. Wherein, the projection of the second opening 252 in the first direction Z covers the projection of the first opening 251 in the first direction Z.

[0064] For example, the area of the cross-section of the through hole 25 (the cross-section is perpendicular to the first direction Z) may show a gradually increasing trend in the direction parallel to the first direction Z. At this time, the cross-sectional shape of the through hole 25 in the direction parallel to the first direction Z may be trapezoidal or approximately trapezoidal. In some other embodiments, the cross-sectional shape of the through hole 25 in the direction parallel to the first direction Z may also be rectangular or other irregular shapes, etc., and the present application does not limit this.

[0065] Wherein, the shapes of the first opening 251 and the second opening 252 may be the same or different. In the embodiments of the present application, the case where the shapes of the two are the same or approximate is taken as an example for illustration. [[ID=IO]]

[0066] Wherein, the side wall 253 may be a plane, or may also be a curved surface, or may also include a plane and a curved surface. Wherein, the side wall 253 and the surface of the low refractive index layer 231 facing away from the substrate layer 21 may be smoothly connected, for example, connected by a rounded corner.

[0067] Please refer to Figure 2 and Figure 4 , Figure 4 is Figure 2 the top view structural schematic diagram of the high refractive index layer 232 shown. Wherein, the top view refers to the direction in which the line of sight is from the light-emitting surface 201 of the display panel 20 to the inside of the display panel 20.

[0068] In some embodiments, the high refractive index layer 232 may include a flat layer 232a and a plurality of protrusions 232b. Figure 2A protrusion 232b is shown. Among them, a plurality of protrusions 232b are fixed on the same side of the flat layer 232a, and the two can be integrally formed. Among them, the flat layer 232a can be located on the side of the low-refractive-index layer 231 facing away from the plurality of pixel units 24, and the plurality of protrusions 232b can be respectively located in the plurality of through holes 25 of the low-refractive-index layer 231. Exemplarily, the protrusion 232b can be filled in the through hole 25, and the shape of the protrusion 232b can be the same as the shape of the through hole 25.

[0069] Exemplarily, the protrusion 232b can include a first surface 2321, a second surface 2322, and a third surface 2323. The first surface 2321 can be located in the first opening 251, and the first surface 2321 can be the surface of the protrusion 232b away from the flat layer 232a; the second surface 2322 can be located in the second opening 252, and the second surface 2322 can be the surface of the protrusion 232b facing the flat layer 232a, and the second surface 2322 is disposed opposite to the first surface 2321; the third surface 2323 can be attached to the side wall 253 of the through hole 25, and the third surface 2323 can be the surface of the protrusion 232b facing the low-refractive-index layer 231, and the third surface 2323 connects the first surface 2321 and the second surface 2322.

[0070] Correspondingly, the area of the second surface 2322 can be larger than the area of the first surface 2321. Among them, the projection of the second surface 2322 in the first direction Z covers the projection of the first surface 2321 in the first direction.

[0071] For example, the area of the cross-section (the cross-section is perpendicular to the first direction Z) of the protrusion 232b can show a gradually increasing trend in the direction parallel to the first direction Z. At this time, the cross-sectional shape of the protrusion 232b in the direction parallel to the first direction Z can be trapezoidal or approximately trapezoidal. In some other embodiments, the cross-sectional shape of the protrusion 232b in the direction parallel to the first direction Z can also be rectangular or other irregular shapes, etc., and the present application does not limit this.

[0072] Among them, the shapes of the first surface 2321 and the second surface 2322 can be the same or different. In the embodiments of the present application, the case where the shapes of the two are the same or approximately the same is taken as an example for illustration.

[0073] Exemplarily, the third surface 2323 can be a plane, or can also be a curved surface, or can also include a plane and a curved surface. The shape of the third surface 2323 corresponds to the side wall 253 of the through hole 25. Among them, the third surface 2323 and the surface of the flat layer 232a facing the microlens 2311 can be smoothly connected, for example, by a rounded corner connection.

[0074] Please refer to Figure 2 and Figure 5 as shown in Figure 5 which is Figure 2Schematic diagram of the projection structure of the first opening 251 and the pixel unit 24 shown on the display panel 20.

[0075] In some embodiments, the first openings 251 of the plurality of through holes 25 may be provided in one-to-one correspondence with the plurality of pixel units 24, and the first opening 251 is located on the light-emitting side of the corresponding pixel unit 24. Among them, the light-emitting side of the pixel unit 24 is the side of the pixel unit 24 facing away from the substrate layer 21. Exemplarily, the pixel unit 24 may form a first projection 31 on the substrate layer 21, and the first opening 251 may form a second projection 32 on the substrate layer 21. Among them, the plurality of second projections 32 may be provided in one-to-one correspondence with the plurality of first projections 31, and the second projection 32 covers the corresponding first projection 31. Among them, the edge of the second projection 32 does not completely coincide with the edge of the first projection 31, and the edge of the second projection 32 surrounds the periphery of the first projection 31. Exemplarily, the plurality of pixel units 24 may include a first pixel unit ( Figure 2 and Figure 5 not shown in both), a second pixel unit ( Figure 2 and Figure 5 not shown in both) and a third pixel unit ( Figure 2 and Figure 5 not shown in both), the first pixel unit, the second pixel unit and the third pixel unit are respectively used to emit light of different colors. For example, the first pixel unit may be used to emit red light, the second pixel unit may emit green light, and the third pixel unit may be used to emit blue light. As Figure 5 shown, the first pixel unit forms a projection 31a on the substrate layer 21, the second pixel unit forms a projection 31b on the substrate layer 21, and the third pixel unit forms a projection 31c on the substrate layer 21.

[0076] The plurality of first openings 251 may include a first sub-opening ( Figure 2 and Figure 5 not shown in both), a second sub-opening ( Figure 2 and Figure 5 not shown in both) and a third sub-opening ( Figure 2 and Figure 5 not shown in both), among which, the first sub-opening may be provided corresponding to the first pixel unit, the second sub-opening may be provided corresponding to the second pixel unit, and the third sub-opening may be provided corresponding to the third pixel unit. As Figure 5 shown, the first sub-opening may form a projection 32a on the substrate layer 21, and the projection 32a may cover the projection 31a; the second sub-opening may form a projection 32b on the substrate layer 21, and the projection 32b may cover the projection 31b; the third sub-opening may form a projection 32c on the substrate layer 21, and the projection 32c may cover the projection 31c.

[0077] In some embodiments, the shapes and / or sizes of the multiple pixel units 24 can be different, and parameters such as the shape and / or size of the first opening 251 corresponding to the pixel unit 24 will also change adaptively. Correspondingly, the shapes and sizes of the projection 31a formed by the first pixel unit on the substrate layer 21, the projection 31b formed by the second pixel unit on the substrate layer 21, and the projection 31c formed by the third pixel unit on the substrate layer 21 can all be different. Adaptively, the shapes and sizes of the projection 32a formed by the first sub-opening on the substrate layer 21, the projection 32b formed by the second sub-opening on the substrate layer 21, and the projection 32c formed by the third sub-opening on the substrate layer 21 can also all be different. For example, the size of the projection 31a formed by the first pixel unit on the substrate layer 21 is smaller than the size of the projection 31b formed by the second pixel unit on the substrate layer 21, and is also smaller than the size of the projection 31c formed by the third pixel unit on the substrate layer 21. Adaptively, the size of the projection 32a formed by the first sub-opening on the substrate layer 21 is smaller than the size of the projection 32b formed by the second sub-opening on the substrate layer 21, and is also smaller than the size of the projection 32c formed by the third sub-opening on the surface of the substrate layer 21 away from the flat layer 232a.

[0078] In addition, the multiple protrusions 232b are arranged in one-to-one correspondence with the multiple through-holes 25. That is, the shape of the surface (the first surface 2321) of the protrusion 232b away from the flat layer 232a is adapted to the shape of the first opening 251 of its corresponding through-hole 25. Among them, a third projection can also be formed by the first surface 2321 of the protrusion 232b on the substrate layer 21, and the third projection can completely overlap with the second projection 32, and the size, shape, etc. of the third projection and the second projection 32 are the same.

[0079] In some examples, the shape and / or size of the first opening 251 of the multiple through-holes 25 will change adaptively with parameters such as the shape and / or size of its corresponding pixel unit 24. Then, the shape and / or size of the surface (the first surface 2321) of the multiple protrusions 232b away from the flat layer 232a will also change adaptively with the shape and / or size of its corresponding first opening 251 and the pixel unit 24. Among them, the shapes and / or sizes of the multiple first surfaces 2321 can all be different, and the shapes and / or sizes of the multiple third projections can all be unequal.

[0080] Please refer to Figure 2 and Figure 6 , Figure 6 which is Figure 2 a partial optical path structure schematic diagram of the display panel 20 shown.

[0081] In some embodiments, the light emitted by the pixel unit 24 may include a first light ray G1 and a second light ray G2. The incident angle of the second light ray G2 entering the first surface 2321 of the protrusion 232b may be greater than the incident angle of the first light ray G1 entering the first surface 2321. Here, the incident angle refers to the angle between the light ray entering the protrusion 232b from the pixel unit 24 in the display panel 20 and the first direction Z. The first light ray G1 may travel along the first direction Z, pass through the microlens layer 23, and directly irradiate the area corresponding to the upper part of the pixel unit 24. The exit angle refers to the angle between the light ray leaving the light-emitting surface 201 in the display panel 20 and the first direction Z.

[0082] In the embodiments of the present application, by providing the protrusion 232b, after the second light ray G2 with a larger incident angle than the first light ray G1 enters the protrusion 232b through the first surface 2321, since the refractive index of the protrusion 232b is greater than the refractive index of the low-refractive-index layer 231 and the incident angle of the second light ray G2 entering the low-refractive-index layer 231 is relatively large, when the second light ray G2 reaches the junction of the protrusion 232b and the low-refractive-index layer 231 (i.e., the third surface 2323), the second light ray G2 will be totally reflected back into the protrusion 232b on the third surface 2323, resulting in total internal reflection, thereby changing the propagation direction of the second light ray G2 (the original direction is Figure 6 as shown by the dashed line with an arrow in ). The angle between the propagation direction of the second light ray G2 on the third surface 2323 and the first direction Z is reduced, which is equivalent to reducing the exit angle of the second light ray G2, enabling the second light ray G2 to exit to the light-emitting surface 201 at a smaller exit angle (such as Figure 6 as shown by the solid line with an arrow in ). Here, the principle of total internal reflection of the light ray on the third surface 2323 can be based on the refraction law: n1*sinθ1 = n2*sinθ2, and the reflection law to determine the exit angle direction of the light ray. Here, θ1 is the exit angle of the light ray in the high-refractive-index layer 232, and θ2 is the exit angle of the light ray in the low-refractive-index layer 231. Here, the third surface 2323 coincides with the side wall 253. The total internal reflection of the light ray on the third surface 2323 is the total internal reflection of the light ray at the connection interface between the protrusion 232b and the low-refractive-index layer 231, and can also be regarded as the total internal reflection of the light ray on the side wall 253.

[0083] Thus, by providing that the microlens layer 23 includes a high refractive index layer 232 and a low refractive index layer 231, the protrusion 232b of the high refractive index layer 232 has a third surface 2323 adjacent to the low refractive index layer 231, such that the third surface 2323 can reflect a part of the light with a relatively large incident angle, causing the outgoing direction of this part of the light to approach the first direction Z and exit from the front view angle or an angle close to the front view angle of the light exit surface 201, which can increase the visible brightness of the light exit surface 201 of the display panel 20 by about 10%, effectively improving the light emitting efficiency of the display panel 20, and also being beneficial to saving the energy consumption of the display panel 20 and increasing the service life of the display panel 20.

[0084] Among them, the luminous efficiency means that the luminous efficiency of the luminescent material can be measured by the current efficiency, and is proportional to the quantum efficiency of the device. The current efficiency refers to the ratio of the luminous brightness to the current density, and the unit is cd / A.

[0085] Exemplarily, the first refractive index n1 of the high refractive index layer 232 can be in the range of 1.6 to 1.9. For example, the first refractive index n1 of the high refractive index layer 232 can be, but is not limited to, 1.6, 1.65, 1.7, or 1.85, etc.; the second refractive index n2 of the low refractive index layer 231 can be in the range of 1.4 to 1.6. For example, the second refractive index n2 of the low refractive index layer 231 can be, but is not limited to, 1.4, 1.45, or 1.5, etc. By adjusting the refractive indices of the high refractive index layer 232 and the low refractive index layer 231, as many more large-angle light rays as possible can undergo total internal reflection on the third surface 2323, so as to change the light path and be able to irradiate the light exit surface 201 at an appropriate range of outgoing angles, ensuring the brightness of the display panel 20 and also being beneficial to reducing the power consumption of the display panel 20.

[0086] In some embodiments, such as Figure 2As shown, the degree of the included angle (cone angle A) between the side wall 253 of the through hole 25 and the surface of the low refractive index layer 231 facing the substrate layer 21 is in the range of 50° to 90°. Exemplarily, the cone angle A can be 50°, 60°, 80°, 90°, etc. When the cone angle A approaches 50°, the inclination degree of the side wall 253 relative to the surface of the low refractive index layer 231 facing the substrate layer 21 can be increased. That is, the inclination degree of the third surface 2323 of the protrusion 232b adapted to the through hole 25 relative to the first surface 2321 can be increased to increase the surface area of the third surface 2323, so that as many light rays with larger emission angles as possible can reach the third surface 2323 and total reflection occurs thereon, and the optical paths of more light rays with larger emission angles can be changed, and they can converge at the light-emitting surface of the display panel 20 with a smaller emission angle, effectively improving the light-emitting efficiency of the display panel 20. When the value of the cone angle A approaches 90°, the light rays emitted from the microlens layer 23 can be made to converge as close as possible to the positive viewing angle of the light-emitting surface 201, improving the degree of light convergence and effectively improving the brightness of the positive viewing angle of the display panel 20.

[0087] In some embodiments, in the direction perpendicular to the substrate layer 21 (the first direction Z), the size of the low refractive index layer 231 can be in the range of 2 μm to 6 μm. For example, it can be 2 μm, 4 μm, 5 μm, 6 μm, etc. By setting the value range of the thickness of the low refractive index layer 231 in the first direction Z, it can not only avoid the situation where when the thickness of the low refractive index layer 231 in the first direction Z is less than 2 μm, the area and other related quantities of the side wall 253 are too small. That is, it will cause a decrease in the number of light rays that can undergo total reflection on the third surface 2323 of the surface that coincides with the side wall 253, thus affecting the brightening effect of the microlens layer 23, but also improve the problem of large processing difficulty caused by too thin a film layer. In addition, it can also avoid the situation where when the thickness of the low refractive index layer 231 is greater than 6 μm, the overall thickness of the display panel 20 is relatively large, affecting the realization of the thin and light of the display panel 20.

[0088] In some embodiments, in the direction perpendicular to the substrate layer 21 (the first direction Z), the size of the high refractive index layer 232 can be in the range of 5 μm to 20 μm. For example, it can be 5 μm, 10 μm, 15 μm, 20 μm, etc. By setting the value range of the thickness of the high refractive index layer 232 in the first direction Z, it can not only avoid problems such as when the high refractive index layer 232 is too thick, the optical path of light in the microlens layer 23 is too long, and the absorption rate of light by the microlens layer 23 is relatively large, thus affecting the light-emitting efficiency of the display panel 20, and the too thick high refractive index layer 232 will also increase the overall thickness of the display panel 20, which is not conducive to the realization of the thin and light of the display panel 20; but also avoid problems such as when the high refractive index layer 232 is too thin, the reflection process of light in it cannot be realized, the effective brightening effect cannot be achieved, and the manufacturing difficulty is large.

[0089] Please refer to Figure 2 and Figure 7 , Figure 7 which Figure 5 is a schematic diagram of a first projection 31 and a second projection 32 shown in

[0090] In some embodiments, the first projection 31 may include four straight edges 311. Among them, two of the four straight edges 311 are oppositely arranged, and the other two straight edges 311 are oppositely arranged. For example, the four straight edges 311 include two first straight edges 3111 and two second straight edges 3112. The two first straight edges 3111 are opposite and spaced along the second direction X, and the two second straight edges 3112 are opposite and spaced along the third direction Y. The second direction X is perpendicular to the third direction Y, and the first direction Z is perpendicular to the second direction X and the third direction Y.

[0091] The second projection 32 may include at least four curved edges 321. The four curved edges 321 may surround the four sides of the first projection 31 and are arranged in one-to-one correspondence with the four straight edges 311. The curved edges 321 may be recessed in a direction close to the straight edges 311. Among them, two of the four curved edges 321 are oppositely arranged and recessed in a direction close to each other, and the other two curved edges 321 are oppositely arranged and recessed in a direction close to each other. Among them, the side wall 253 may correspondingly be a curved surface recessed into the interior of the first opening 251 of the through hole 25. Adaptively, at this time, within the protrusion 232b adapted to the through hole 25, the third surface 2323 of the protrusion 232b may correspondingly be a curved surface recessed into the interior of the protrusion 232b.

[0092] Exemplarily, the four curved edges 321 include two first curved edges 3211 and two second curved edges 3212. The two first curved edges 3211 are respectively arranged corresponding to the two first straight edges 3111 and are recessed toward the side of the first straight edges 3111; the two second curved edges 3212 are respectively arranged corresponding to the two second straight edges 3112 and are recessed toward the side of the second straight edges 3112. Among them, the first curved edge 3211 is arranged corresponding to the first straight edge 3111, which means that the first straight edge 3111 and the second straight edge 3112 are arranged in the second direction X, then the first curved edge 3211 and the first straight edge 3111 are also arranged in the second direction X, and the first curved edge 3211 is located on the side of the first straight edge 3111 away from the second straight edge 3112. The same understanding is made for the cases where other curved edges 321 are arranged corresponding to the straight edges 311, and details are not described here.

[0093] Among them, the second projection 32 may further include four connecting edges 323. In the circumferential direction of the second projection 32, the four connecting edges 323 and the four curved edges 321 are alternately arranged and connected. Exemplarily, the connecting edge 323 may be connected between an adjacent first curved edge 3211 and a second curved edge 3212, so that the second projection 32 has a continuous closed shape. Among them, parameters such as the shape, side length, and curvature of the four connecting edges 323 may be the same or different, and the present application does not limit this. In some other embodiments, the second projection 32 may not include the connecting edge 323, and in the circumferential direction of the second projection 32, the four curved edges 321 may be sequentially connected end to end.

[0094] Please refer to Figure 2 , Figure 7 and Figure 8 , Figure 8 which is a relationship diagram of the brightness and the exit angle of a display panel 20 provided by an embodiment of the present application.

[0095] In Figure 8 , when the shape of the first projection 31 is similar to the shape of the second projection 32, for example, the pixel unit 24 is rectangular, the first projection 31 is rectangular, and the first opening 251 is also a similar rectangle, so that the second projection 32 is also rectangular, the curve 1 is the relationship line between the brightness and the exit angle of the display panel 20; in the embodiment of the present application, when the shape of the first projection 31 is different from the shape of the second projection 32, the curve 2 is the relationship line between the brightness and the exit angle of the display panel 20.

[0096] By setting the shape of the second projection 32 to be different from that of the first projection 31. For example, in the embodiments of the present application, the four curved edges 321 of the second projection 32 are respectively recessed towards the four straight edges 311 of the first projection 31, which can increase the perimeter of the second projection 32. That is, the embodiments of the present application can change the shape of the first opening 251 to increase the perimeter of the first opening 251, thereby changing the area of the sidewall 253 adjacent to the edge of the first opening 251, that is, increasing the area of the third surface 2323 that coincides with the sidewall 253, so that more light rays with larger exit angles can reach the third surface 2323 for total internal reflection, improving the area of the surface (i.e., the third surface 2323) that effectively adjusts the light path within the protrusion 232b, enabling more light rays with larger exit angles to converge towards the first direction Z (smaller exit angles), thereby reducing the emission brightness of the large viewing angle (the area corresponding to the light rays with larger exit angles) on the display panel 20 and increasing the emission brightness of the small viewing angle (the area corresponding to the light rays with smaller exit angles), so as to improve the display brightness of the front viewing angle of the display panel 20, adjust the light pattern distribution, achieve viewing angle brightness attenuation adjustment, and contribute to improving the usage experience of the display device 100. In addition, during the manufacturing process of the display panel 20, by adjusting the shape of the mask, the desired shape of the first opening 251 and its corresponding protrusion 232b can be obtained without additionally adding other components or processes, thereby achieving a greater increase in the brightness of the display panel 20. The manufacturing process is relatively simple and the manufacturing cost is low, which is conducive to the large-scale production of the display panel 20.

[0097] In some embodiments of the present application, by adjusting the shape of the second projection 32, that is, adjusting the shape of the first opening 251, the color shift effect of the display panel 20 at different viewing angles can also be adjusted. Exemplarily, the display panel may include three types of pixel units ( Figure 8 (not shown in the figure). The three types of pixel units may include a first pixel unit, a second pixel unit, and a third pixel unit, and the light rays emitted by the first pixel unit, the second pixel unit, and the third pixel unit have different colors, that is, the emission energies of the light rays emitted by the three types of pixel units are different. However, as the viewing angle increases, the brightness attenuation rates of the different - colored light rays emitted by different pixel units 24 are different. Among them, the light rays with higher emission energy emitted by the pixel unit 24 are more likely to attenuate, resulting in the color of the light rays with lower energy tending to be presented on the display panel 20 after the mixing of the three types of pixel units 24, causing a color shift phenomenon.

[0098] In the embodiments of the present application, by adjusting the shape or size of the first opening 251 corresponding to different pixel units 24, etc., the brightness attenuation rate of the light rays emitted by different pixel units 24 as the viewing angle increases can be adaptively adjusted, so that the brightness attenuation rates of different - colored light rays as the viewing angle increases are more matched, thereby improving the color shift effect.

[0099] In some embodiments, as Figure 7 shown, the two first curved edges 3211 can be symmetrically arranged, and the two second curved edges 3212 can be symmetrically arranged. By setting the curved edges 321 of the second projection 32 to be symmetrically arranged in pairs, that is, the two opposite side edges adjacent to the first opening 251 are symmetrically arranged. In other words, within the protrusion 232b adapted to the first opening 251, it can be ensured that the reflection paths of light on the opposite sides within the protrusion 232b are symmetrically distributed, which is beneficial to improving the uniformity of imaging and avoiding problems such as inconsistent brightness on both sides in the image presented on the display panel 20, and ensuring the display effect of the display panel 20.

[0100] In some embodiments, as Figure 7 shown, the minimum distance between the curved edge 321 and the corresponding straight edge 311 is in the range of 0 μm to 3 μm. Exemplarily, the minimum distance between the first curved edge 3211 and the first straight edge 3111 is L1. L1 can be greater than or equal to 0 μm and less than or equal to 3 μm. L1 can be 0 μm, 1 μm, 2 μm, or 3 μm, etc., and L1 can also be in the range of 0 μm to 2 μm. The minimum distance between the second curved edge 3212 and the second straight edge 3112 is L2. L2 can be greater than or equal to 0 μm and less than or equal to 3 μm. Exemplarily, L2 can be 0 μm, 1 μm, 2 μm, or 3 μm, etc., and L2 can also be in the range of 0 μm to 2 μm. Among them, L1 can be greater than, less than, or equal to L2, and the present application does not limit this.

[0101] By setting L1 greater than or equal to 0, and / or, L2 greater than or equal to 0, to ensure that the projection of the first opening 251 on the substrate layer 21 (as Figure 2 shown) can cover the pixel unit 24 (as Figure 2 shown). The larger the values of L1 and L2, the more light can enter the protrusion 232b (as Figure 2 shown) to improve the visible brightness of the display panel 20. In addition, by setting L1 less than or equal to 3 μm, and / or, L2 less than or equal to 3 μm, it can be avoided that the distance between the curved edge 321 and the corresponding straight edge 311 is too large, affecting the total reflection effect of the third surface 2323 of the protrusion 232b on light, thereby reducing the benefit. Among them, the minimum distance between the first curved edge 3211 and the first straight edge 3111 is the distance between the point on the first curved edge 3211 closest to the first straight edge 3111 and the first straight edge 3111 in the second direction X; the minimum distance between the second curved edge 3212 and the second straight edge 3112 is the distance between the point on the second curved edge 3212 closest to the second straight edge 3112 and the second straight edge 3112 in the third direction Y.

[0102] In some embodiments, the length of the curved edge 321 is related to the length of the corresponding straight edge 311 to ensure that the second projection 32 can cover the first projection 31.

[0103] In some embodiments, the degree of the central angle of the curved edge 321 is in the range of 60° to 120°. Exemplarily, the degree of the first central angle B of the first curved edge 3211 can be in the range of 60° to 120°. Exemplarily, the degree of the first central angle B of the first curved edge 3211 can be 60°, 65°, 75°, 90°, 105°, or 120°, etc.; and / or, the degree of the second central angle C of the second curved edge 3212 can be greater than or equal to 60° and less than or equal to 120°. Exemplarily, the degree of the second central angle C of the second curved edge 3212 can be 65°, 75°, 90°, or 105°, etc. By adjusting the degree of the central angle of the curved edge 321, while increasing the area of the sidewall 253, that is, increasing the area of the third surface 2323 that coincides with it, more light undergoes total internal reflection on the third surface 2323, taking into account the total internal reflection effect of the third surface 2323 of the protrusion 232b on the light while improving the brightness of the display panel 20.

[0104] In some embodiments, the ratio of the radius of the curved edge 321 to the side length of the straight edge 311 is in the range of 0.5 to 0.9. Exemplarily, the ratio of the first radius R1 of the first curved edge 3211 to the first side length 2a of the first straight edge 3111 can be between 0.5 and 0.9. Exemplarily, the ratio of the first radius R1 to the first side length ۲a can be 0.5, 0.6, 0.7, 0.85, or 0.9, etc.; and / or, the ratio of the second radius R2 of the second curved edge 3212 to the second side length 2b of the second straight edge 3112 can be between 0.5 and 0.9. Exemplarily, the ratio of the second radius R2 to the second side length 2b can be 0.5, 0.৬, 0.7, 0.85, or 0.9, etc. By adjusting the ratio of the radius of the curved edge 321 to the side length of the straight edge 311, while increasing the area of the third surface 2323, more light undergoes total internal reflection on the third surface 2323, taking into account the total internal reflection effect of the third surface 2323 of the protrusion 232b on the light while improving the brightness of the display panel 20.

[0105] Wherein, the ratio of the first radius R1 to the first side length 2a and the ratio of the second radius R2 to the second side length 2b can be equal or not equal, and the present application does not limit this.

[0106] In the embodiments of the present application, the shape of the second projection 32 can be related to the side length of the straight edge 311 of the first projection 31. The relevant parameters corresponding to the first curved edge 3211 and the second curved edge 3212, such as the first central angle B, the second central angle C, the first radius R1, and the second radius R2, etc., can all be associated with the first side length 2a and the second side length 2b.

[0107] In some embodiments, the coupling relationships between the first central angle B, the second central angle C, the first radius R1, and the second radius R2, and the first side length 2a and the second side length 2b may be as follows: In other embodiments, there may also be other coupling relationships between parameters such as the first central angle B, the second central angle C, the first radius R1, and the second radius R2, and the first side length 2a and the second side length 2b. The present application does not limit this.

[0108] Please refer back again to Figure 2 and Figure 7 As shown, in some embodiments, the connecting edge 323 is a curved edge that is concave towards the first projection 31. Exemplarily, the connecting edge 323 may be connected between the adjacent first curved edge 3211 and the second curved edge 3212. By setting the connecting edge 323, the perimeter of the second projection 32 can also be increased, so as to increase the perimeter of the first opening 251, thereby increasing the area of the sidewall 253, that is, increasing the area of the third surface 2323, so that more light can undergo total internal reflection on the third surface 2323, and the exit angle approaches the first direction Z, which is beneficial to improving the light convergence effect of the microlens layer 23, and thus effectively improves the brightness of the display panel 20.

[0109] Exemplarily, the degree of the third central angle D corresponding to the connecting edge 323 may be greater than 0° and less than or equal to 180°. Exemplarily, the degree of the central angle of the connecting edge may be 10°, 90°, or 180°, etc., so as to increase the perimeter of the first opening 251, thereby increasing the area of the sidewall 253, that is, increasing the area of the third surface 2323, enabling more light to undergo total internal reflection on the third surface 2323, and improving the brightness of the display panel 20 while taking into account the total internal reflection effect of the third surface 2323 on light.

[0110] In some embodiments, the minimum distance L3 between the connecting edge 323 and the first projection 31 is in the range of 0 μm to 3 μm. Exemplarily, the minimum distance between the connecting edge 323 and the first projection is L3, and L3 may be greater than or equal to 0 μm and less than or equal to 3 μm. L3 may be 0 μm, 1 μm, 2 μm, or 3 μm, etc., and L3 may also be in the range of 0 μm to 2 μm. By setting L3 to be greater than or equal to 0, it is ensured that the projection of the protrusion 232b on the substrate layer 21 (as Figure 2 shown) can cover the pixel unit 24 (as Figure 2 shown). The larger the value of L3, the larger the area of the second projection 32. Correspondingly, the area of the first opening 251 is larger, so that more light can enter the protrusion 232b (as Figure 2inside (as shown), to improve the visible brightness and luminous efficiency of the display panel 20. In addition, by setting L3 to be less than or equal to 3 μm, the aim is to avoid too large a distance between the connecting edge 323 and the first projection 31, which affects the total internal reflection effect of the third surface 2323 of the protrusion 232b on light, thereby reducing the benefit. Among them, the minimum distance between the connecting edge 323 and the first projection 31 can be the minimum distance between the point on the connecting edge 323 closest to the first projection 31 and the included angle formed by connecting the first straight edge 3111 and the second straight edge 3112 adjacent to the connecting edge 323.

[0111] Please refer to Figure 9 , Figure 9 which is a schematic structural diagram of another first projection 31 and second projection 32 provided by an embodiment of the present application. Figure 9 The embodiment shown may include Figure 7 most of the technical features of the embodiment shown. The following mainly describes the differences between the two, and the same content of the two will not be elaborated.

[0112] Exemplarily, the pixel unit 24 can be square, that is, the first projection 31 can be square, and the first side length 2a can be equal to the second side length 2b. At this time, the degrees of the central angles corresponding to the four curved edges 321 can be equal, and each is 90°, and the relational expression can be satisfied: The radii corresponding to the four curved edges 321 can also be equal, and the relational expression can be satisfied: The ratio of the radii of the four curved edges 321 to the side lengths of the four straight edges 311 is

[0113] Please refer to Figure 10 , Figure 10 which is a schematic structural diagram of another first projection 31 and second projection 32 provided by an embodiment of the present application. Figure 10 The embodiment shown may include Figure 7 most of the technical features of the embodiment shown. The following mainly describes the differences between the two, and the same content of the two will not be elaborated.

[0114] Exemplarily, the connecting edge 323 can also be a straight line. At this time, the minimum distance L3 between the connecting edge 323 and the first projection 31 is the minimum distance from the connecting edge 323 to the included angle formed by connecting the first straight edge 3111 and the second straight edge 3112 adjacent to the connecting edge 323.

[0115] In the foregoing embodiment, taking the pixel unit 24 as rectangular and the first projection 31 as rectangular as an example, the shape of the second projection 32 is designed accordingly. In other embodiments, the pixel unit 24 can also be of other shapes. For example:

[0116] Please refer to Figure 11 , Figure 11It is a schematic structural diagram of a first projection 31 and a second projection 32 provided by another embodiment. This embodiment may include most of the technical solutions of the previous embodiment. The following mainly describes the differences between the two, and most of the same content between the two will not be elaborated.

[0117] In some embodiments, the pixel unit 24 may also be in a rounded rectangle shape. Correspondingly, the first projection 31 may be in a rounded rectangle shape. The first projection 31 may include four straight edges 311 and four arc edges 312. The four straight edges 311 are pairwise relatively parallel, and a right angle is formed between two adjacent straight edges 311. The four arc edges 312 are respectively connected between two adjacent straight edges 311. Exemplarily, the four straight edges 311 may include two first straight edges 3111 and two second straight edges 3112. The two first straight edges 3111 are opposite and spaced apart along the second direction X, and the two second straight edges 3112 are opposite and spaced apart along the third direction Y. The arc edge 312 may be connected between the first straight edge 3111 and the second straight edge 3112. The second direction X is perpendicular to the third direction Y, and the first direction Z is perpendicular to the second direction X and the third direction Y.

[0118] Make adaptive adjustments to other related structures in this embodiment. For example, the four connecting edges 323 are arranged in one-to-one correspondence with the four arc edges 312. The minimum distance L3 between the connecting edge 323 and the first projection 31 is in the range of 0 μm to 3 μm. In some embodiments, the minimum distance between the connecting edge 323 and the first projection 31 may be the minimum distance between the point on the connecting edge 323 closest to the corresponding arc edge 312 and the arc edge 312 closest to the connecting edge 323.

[0119] Please refer to again Figure 2 , the display panel 20 may further include a packaging layer 26. The packaging layer 26 may be connected between the microlens layer 23 and the pixel definition layer 22. The packaging layer 26 can package the pixel definition layer 22 and the substrate layer 21 to prevent water and oxygen from invading the pixel definition layer 22 and the substrate layer 21, thereby reducing phenomena such as bubbles in the film layers in the display panel 20 or aging of structural components such as the pixel unit 24. The packaging method of the packaging layer 26 generally includes glass or metal cover plate packaging, thin film packaging, indium sealing, frit welding, etc. Among them, the packaging layer 26 can transmit light to reduce the blocking of the transmitted light. In other embodiments, the packaging layer 26 may also be located at other positions, and the present application does not limit this.

[0120] Exemplarily, the encapsulation layer 26 may further include a first encapsulation layer 261, a third encapsulation layer 263, and a second encapsulation layer 262 arranged along the first direction Z. The first encapsulation layer 261 may be disposed closer to the pixel definition layer 22 relative to the second encapsulation layer 262. Exemplarily, the first encapsulation layer 261 may be made of inorganic materials such as silicon dioxide, silicon nitride, or aluminum oxide. The third encapsulation layer 263 may be made of organic materials such as acrylic fiber, hexamethyldisiloxane, polyacrylates, polycarbonates, or polystyrene. The second encapsulation layer 262 may be made of inorganic materials such as silicon dioxide, silicon nitride, or aluminum oxide. The first encapsulation layer 261 and the second encapsulation layer 262 mainly function to isolate water and oxygen. The third encapsulation layer 263 is located between the first encapsulation layer 261 and the second encapsulation layer 262, and can play a certain role in buffering water and oxygen to release stress and improve the flexibility and reliability of the encapsulation layer 26.

[0121] It can be understood that the first encapsulation layer 261 and the second encapsulation layer 262 may be single-layer inorganic encapsulation layers, and the third encapsulation layer 263 is a single-layer organic encapsulation layer. In other embodiments, the first encapsulation layer 261, the second encapsulation layer 262, or the third encapsulation layer 263 may also be an encapsulation layer with a multi-layer stacked structure in which an inorganic layer and an organic layer are stacked. For example, it may be a three-layer structure of an inorganic layer, an organic layer, and an inorganic layer stacked in sequence, or a four-layer structure of an inorganic layer, an organic layer, an inorganic layer, and an organic layer stacked in sequence, or a five-layer or more structure stacked. In some embodiments, the encapsulation layer 26 may not include the first encapsulation layer 261, the second encapsulation layer 262, and the third encapsulation layer 263, and the encapsulation structure may be a single-layer structure formed by an inorganic material layer. The present application does not limit this.

[0122] Exemplarily, in the first direction Z, the distance between the first opening 251 and the pixel unit 24 is in the range of 10 μm to 15 μm. That is, the distance between the first surface 2321 and the pixel unit 24 may be 10 μm, 12 μm, 14 μm, or 15 μm, etc. In the embodiment of the present application, in the first direction Z, the distance between the first surface 2321 and the pixel unit 24 can also be understood as the thickness of the encapsulation layer 26 in the first direction Z. By setting the thickness of the encapsulation layer 26 in the first direction Z in the range of 10 μm to 15 μm, it is possible to reduce the thickness of the display panel 20 in the first direction Z while ensuring the encapsulation effect of the encapsulation layer 26, which is beneficial to realizing the thinning of the display panel 20.

[0123] In some embodiments, the display panel 20 may further include an adhesive layer 27 and a cover plate layer 28. The cover plate layer 28 may be connected to the side of the microlens layer 23 facing away from the encapsulation layer 26 through the adhesive layer 27. Exemplarily, the adhesive layer 27 may be made of an optically clear adhesive (OCA). The cover plate layer 28 may be a transparent glass cover plate or a cover plate made of an organic material such as polyimide, etc., so as to protect other film layers in the display panel 20 while reducing the influence on the light output effect of the display panel 20. In other embodiments, the cover plate layer 28 may also be connected to other film layers in the display panel 20, and the display panel 20 may also include more or fewer film layers, and the present application does not limit this.

[0124] In the foregoing embodiments, taking the case where the microlens layer 23 is located on the side of the encapsulation layer 26 facing away from the substrate layer 21 as an example, corresponding designs for the display panel 20 have been made. In other embodiments, the encapsulation layer 26 and the microlens layer 23 can also have other relative positional relationships. For example:

[0125] Please refer to Figure 12 , Figure 12 is a cross-sectional schematic diagram of a display panel 20 provided by another embodiment. This embodiment may include most of the technical solutions of the foregoing embodiments. The following mainly describes the differences between the two, and most of the same content between the two will not be elaborated.

[0126] In some embodiments, the encapsulation layer 26 of the display panel 20 includes a first encapsulation layer 261 and a second encapsulation layer 262 that are spaced apart. The first encapsulation layer 261 and the second encapsulation layer 262 are respectively connected to opposite side surfaces of the microlens layer 23, and the first encapsulation layer 261 is located between the microlens layer 23 and the plurality of pixel units 24. At this time, the microlens layer 23 can be connected between the first encapsulation layer 261 and the second encapsulation layer 262.

[0127] Among them, at least one of the first encapsulation layer 261, the second encapsulation layer 262, and the microlens layer 23 includes an organic layer and an inorganic layer. Exemplarily, the first encapsulation layer 261 may be made of an inorganic material such as silicon dioxide, silicon nitride, or aluminum oxide, the second encapsulation layer 262 may be made of an inorganic material such as silicon dioxide, silicon nitride, or aluminum oxide, and the microlens layer 23 may be made of an organic material such as polymethyl methacrylate (PMMA).

[0128] In this embodiment, the first encapsulation layer 261, the microlens layer 23, and the second encapsulation layer 262 can form a three-layer structure in which an inorganic layer, an organic layer, and an inorganic layer are stacked. Among them, the first encapsulation layer 261 and the second encapsulation layer 262 mainly serve to isolate water and oxygen. By arranging the microlens layer 23 between the first encapsulation layer 261 and the second encapsulation layer 262, it can play a certain role in buffering water and oxygen to release the stress between the first encapsulation layer 261 and the second encapsulation layer 262, and improve the flexibility and connection reliability between the two inorganic structure layers of the first encapsulation layer 261 and the second encapsulation layer 262.

[0129] It can be understood that the first encapsulation layer 261 and the second encapsulation layer 262 can be single-layer inorganic encapsulation layers. In other embodiments, the first encapsulation layer 261 and the second encapsulation layer 262 can also be encapsulation layers with a multi-layer stacked structure in which an inorganic layer and an organic layer are alternately arranged. For example, it can be a three-layer structure of an inorganic layer, an organic layer, and an inorganic layer stacked in sequence, or a four-layer structure of an inorganic layer, an organic layer, an inorganic layer, and an organic layer stacked in sequence, or a five-layer or more structure stacked.

[0130] In addition, in the embodiment of the present application, the microlens layer 23 can achieve functional multiplexing, which is beneficial to reducing the number of stacked layers in the display panel 20 to reduce the distance between the first surface 2321 and the pixel unit 24, and can also reduce the number of other film layers in the display panel 20 that the light emitted from the pixel unit 24 passes through before reaching the microlens layer 23, thereby reducing the optical loss due to reflection or refraction of light, which is beneficial to improving the light extraction efficiency of the display panel 20.

[0131] Exemplarily, in the first direction Z, the distance between the first opening 251 and the pixel unit 24 can be in the range of 2 μm to 5 μm. Exemplarily, it can be 2 μm, 3 μm, or 5 μm, etc., which can make more light enter the microlens layer 23 to improve the brightness of the display panel 20 while taking into account the process manufacturing difficulty.

[0132] In some embodiments, the display panel 20 may further include a functional layer 29, and the functional layer 29 can be connected between the adhesive layer 27 and the first encapsulation layer 261. Exemplarily, the functional layer 29 can be an insulating layer for isolating adjacent metal layers in the display panel 20 to prevent short circuits in the display panel 20. In other embodiments, the functional layer 29 can also be a touch layer for realizing the touch detection function of the display panel 20. The present application does not limit the specific structure and function of the functional layer 29.

[0133] It should be noted that, without conflict, the embodiments in the present application and the features in the embodiments can be combined with each other. Any combination of the features in different embodiments is also within the protection scope of the present application. That is to say, the multiple embodiments described above can also be arbitrarily combined according to actual needs.

[0134] It should be noted that all the above-mentioned drawings are exemplary illustrations of the present application and do not represent the actual size of the product. Moreover, the dimensional ratio relationship between the components in the drawings is not a limitation on the actual product of the present application.

[0135] The above are only some embodiments and implementation manners of the present application. The protection scope of the present application is not limited thereto. Any person skilled in the art can easily think of changes or substitutions within the technical scope disclosed in the present application, and all should be covered within the protection scope of the present application. Therefore, the protection scope of the present application shall be subject to the protection scope of the claims.

Claims

1. A display panel, characterized in that, Comprising: A substrate layer; A plurality of pixel units, located on the same side of the substrate layer; And, A microlens layer, located on the side of the plurality of pixel units facing away from the substrate layer. The microlens layer includes a low-refractive-index layer and a high-refractive-index layer. The low-refractive-index layer is provided with a plurality of through holes arranged at intervals. The refractive index of the high-refractive-index layer is greater than that of the low-refractive-index layer. The high-refractive-index layer includes a flat layer and a plurality of protrusions. The flat layer is located on the side of the low-refractive-index layer facing away from the plurality of pixel units, and the plurality of protrusions are respectively located in the plurality of through holes; Wherein, the pixel unit forms a first projection on the substrate layer. The first projection is rectangular or rounded rectangular, and the first projection includes four straight edges; the through hole has a first opening close to the plurality of pixel units. The first opening forms a second projection on the substrate layer. The second projection covers the first projection. The second projection includes four curved edges. The four curved edges surround the first projection and are arranged in one-to-one correspondence with the four straight edges. The curved edges are recessed in the direction close to the straight edges.

2. The display panel according to claim 1, wherein The minimum distance between the curved edge and the corresponding straight edge is in the range of 0 μm to 3 μm.

3. The display panel according to claim 1 or 2, wherein The ratio of the radius of the curved edge to the side length of the straight edge is in the range of 0.5 to 0.

9.

4. The display panel according to any one of claims 1 to 3, characterized in that, The degree of the central angle of the curved edge is in the range of 60° to 120°.

5. The display panel according to claim 1 or 2, wherein The lengths of the four straight edges are equal, the central angles of the four curved edges are all 90°, and the ratio of the radius of the curved edge to the length of the straight edge is 6. The display panel according to any one of claims 1 to 5, characterized in that, The second projection further includes four connecting edges. In the circumferential direction of the second projection, the four connecting edges and the four curved edges are alternately arranged and connected. The connecting edge is a curved edge or a straight edge recessed towards the first projection.

7. The display panel according to claim 6, wherein The minimum distance between the connecting edge and the first projection is in the range of 0 μm to 3 μm.

8. The display panel according to claim 6 or 7, characterized in that, The degree of the central angle of the connecting edge is greater than 0° and less than or equal to 180°.

9. The display panel according to any one of claims 1 to 8, characterized in that, The refractive index of the low-refractive-index layer is in the range of 1.4 to 1.6; And / or, the refractive index of the high-refractive-index layer is in the range of 1.6 to 1.9; And / or, in the direction perpendicular to the substrate layer, the size of the low-refractive-index layer is in the range of 2 μm to 6 μm; And / or, in the direction perpendicular to the substrate layer, the size of the high-refractive-index layer is in the range of 5 μm to 20 μm.

10. The display panel according to any one of claims 1 to 9, characterized in that, The degree of the included angle between the first opening and the surface of the low-refractive-index layer facing the substrate layer is in the range of 50° to 90°.

11. The display panel according to any one of claims 1 to 10, characterized in that, The display panel further includes a packaging layer. The packaging layer is located between the microlens layer and the plurality of pixel units. In the direction perpendicular to the substrate layer, the distance between the first opening and the pixel unit is in the range of 10 μm to 15 μm.

12. The display panel according to any one of claims 1 to 10, characterized in that, The display panel further includes a packaging layer. The packaging layer includes a first packaging layer and a second packaging layer arranged at intervals. The first packaging layer and the second packaging layer are respectively connected to the opposite two surface of the microlens layer, and the first packaging layer is located between the microlens layer and the plurality of pixel units; at least one of the first packaging layer, the second packaging layer and the microlens layer includes an organic layer and an inorganic layer; In a direction perpendicular to the substrate layer, the distance between the first opening and the pixel unit is in the range of 2 μm to 5 μm.

13. A display device, characterized in that, A display panel and a housing, the display panel being installed in the housing, wherein the display panel includes any one of the display panels according to claims 1 to 12 above.

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