Display panel and preparation method therefor, and display apparatus

Abstract

The present application relates to the technical field of display and discloses a display panel and a preparation method therefor, and a display apparatus. The display panel comprises a base substrate, and a plurality of pixel units and an organic insulating layer which are located on the base substrate. The organic insulating layer is located between a drive circuit and a light-emitting unit of each pixel unit. A lens assembly is provided on a portion of the surface of the organic insulating layer away from the base substrate and located in a light-emitting region of the pixel unit. The lens assembly comprises a plurality of lenses, and a conical structure is formed between two adjacent lenses. A first surface and a second surface of each conical structure away from the base substrate can be used to reflect light limited in the interior of the display panel to the emergent side, such that the amount of emitted light and the light extraction effect of the light are improved, thereby ensuring the light-emitting effect of the display panel.

Description

Display panel and manufacturing method thereof, and display device

[0001] This disclosure claims priority to Chinese patent application No. 202311251525.8 filed on September 26, 2023, entitled “Display panel, preparation method thereof, and display device”. The entire contents of the above case are incorporated into this disclosure by reference. Technical Field

[0002] The present application relates to the field of display technology, and in particular to a display panel and a manufacturing method thereof, and a display device. Background Art

[0003] Organic light-emitting diode (OLED) display panels have been widely used due to their self-luminescence, fast response, wide viewing angle, high brightness, bright colors, light weight and thin thickness.

[0004] Summary of the Invention

[0005] This application provides a display panel and a method for manufacturing the same, and a display device. The technical solutions are as follows:

[0006] In one aspect, a display panel is provided, comprising:

[0007] a base substrate, the base substrate comprising a display area and a peripheral area surrounding the display area;

[0008] A plurality of pixel units, the plurality of pixel units being located on one side of the base substrate and in the display area; wherein each of the pixel units includes a driving circuit and a light-emitting unit, the light-emitting unit being connected to the driving circuit and configured to receive a driving signal provided by the driving circuit;

[0009] and an organic insulating layer, wherein the organic insulating layer is located between the driving circuit and the light-emitting unit;

[0010] In which, the part of the organic insulating layer located in the light-emitting area of ​​the pixel unit and away from the surface of the base substrate has a lens assembly, the lens assembly includes a plurality of lenses, and a conical structure is formed between adjacent lenses, and at least one of the conical structures includes a first surface and a second surface on the side away from the base substrate.

[0011] Optionally, each of the conical structures includes a first end, a second end, and a middle portion located between the first end and the second end, and at least one of the first end and the second end of each conical structure is connected to the first end or the second end of another conical structure;

[0012] The width of the orthographic projections of the first and second ends of the conical structure on the substrate is greater than the width of the orthographic projection of the middle portion of the conical structure on the substrate, and the width is perpendicular to the direction of the line connecting the first and second ends.

[0013] Optionally, each of the conical structures includes a first end, a second end, and a middle portion located between the first end and the second end, and at least one of the first end and the second end of each conical structure is connected to the first end or the second end of another conical structure;

[0014] The heights of the first end and the second end of the tapered structure are greater than the height of the middle portion of the tapered structure, and the heights are perpendicular to the supporting surface of the base substrate.

[0015] Optionally, a side of the conical structure away from the base substrate forms a mesh structure, and the mesh structure includes a plurality of grids arranged in an array, wherein the plurality of grids have the same shape.

[0016] Optionally, in the mesh structure, the shape of at least one grid is a quadrilateral or a hexagon.

[0017] Optionally, the orthographic projection of at least one area enclosed by the grid on the substrate is a circle.

[0018] Optionally, for each of the pixel units, an area of ​​a side of the conical structure located in the light-emitting region of the pixel unit away from the substrate is smaller than an area of ​​the light-emitting region of the pixel unit.

[0019] Optionally, the light emitting unit includes: an anode layer, a light emitting layer, and a cathode layer stacked in sequence in a direction away from the base substrate, and the display panel further includes a pixel defining layer;

[0020] The anode layer includes a plurality of anode patterns, the pixel defining layer includes a plurality of hollow regions, each of the hollow regions exposing one of the anode patterns, the light-emitting layer includes a plurality of light-emitting patterns, each of the light-emitting patterns contacts one of the anode patterns through one of the hollow regions, and the cathode layer contacts the light-emitting patterns; wherein the hollow regions serve as the light-emitting regions;

[0021] The total thickness of the anode pattern, the light-emitting pattern and the cathode layer located on the first surface and the second surface is smaller than the total thickness of other parts of the anode pattern, the light-emitting pattern and the cathode layer.

[0022] Optionally, the plurality of pixel units include: a first pixel unit, a second pixel unit and a third pixel unit;

[0023] The lens assembly includes a first type of lens assembly, a second type of lens assembly, and a third type of lens assembly, wherein the orthographic projection of the first type of lens assembly on the substrate is located in the light-emitting area of ​​the first pixel unit, the orthographic projection of the second type of lens assembly on the substrate is located in the light-emitting area of ​​the second pixel unit, and the orthographic projection of the third type of lens assembly on the substrate is located in the light-emitting area of ​​the third pixel unit;

[0024] In which, the first angle between the first surface of the conical structure formed by the lens included in the first type of lens component and the second surface and the supporting surface of the substrate, the second angle between the first surface of the conical structure formed by the lens included in the second type of lens component and the supporting surface of the substrate, and the third angle between the first surface of the conical structure formed by the lens included in the third type of lens component and the second surface and the supporting surface of the substrate are different from each other.

[0025] Optionally, the first pixel unit is a blue pixel unit, the second pixel unit is a green pixel unit, and the third pixel unit is a red pixel unit;

[0026] The first angle is greater than the second angle, and the second angle is greater than the third angle.

[0027] Optionally, the first angle ranges from 56 degrees to 60 degrees, the second angle ranges from 40 degrees to 44 degrees, and the third angle ranges from 29 degrees to 33 degrees.

[0028] Optionally, the tapered structure includes: a first section line of the first surface and a second section line of the second surface;

[0029] The first section line and the second section line are both straight lines; or, the first section line and the second section line are both curved lines;

[0030] Among them, the first section line and the second section line are both sections of the middle part of the conical structure on a reference plane, the reference plane is perpendicular to the length direction of the conical structure and perpendicular to the supporting surface of the base substrate, and the first section line and the second section line are symmetrical relative to the central axis of the conical structure along the length direction.

[0031] Optionally, the display panel further comprises: a color filter layer located between the organic insulating layer and the driving circuit, the color filter layer comprising a plurality of color resist blocks of different colors;

[0032] The orthographic projection of each color resist block on the base substrate covers a light emitting area of ​​one pixel unit.

[0033] Optionally, the light-emitting side of the display panel is a side of the base substrate away from the pixel unit;

[0034] The first surface and the second surface are used to reflect light from one side of the base substrate, and the light reflected by the first surface and the second surface passes through the color resist block and then emerges from a side of the base substrate away from the pixel unit.

[0035] In another aspect, a method for preparing a display panel is provided, the method comprising:

[0036] Obtaining a base substrate, wherein the base substrate includes a display area and a peripheral area surrounding the display area;

[0037] forming a plurality of pixel units including a driving circuit;

[0038] forming an organic insulating film on a side of the driving circuit away from the base substrate;

[0039] forming a metal mask on a side of the organic insulating film away from the base substrate;

[0040] etching the organic insulating film using the metal mask to obtain the organic insulating layer;

[0041] removing the metal mask;

[0042] A plurality of pixel units including light-emitting units are formed on a side of the organic insulating layer away from the base substrate, wherein the light-emitting units are connected to the driving circuit and are used to receive driving signals provided by the driving circuit;

[0043] In which, the surface of the organic insulating layer located in the light-emitting area of ​​the pixel unit away from the substrate has a lens assembly, and the lens assembly includes a plurality of lenses, and a conical structure is formed between adjacent lenses. At least one of the conical structures includes a first surface and a second surface on the side away from the substrate, and the first surface and the second surface are used to reflect light.

[0044] In another aspect, a display device is provided, comprising: a power supply component and the display panel according to the above aspect;

[0045] Wherein, the power supply component is used to supply power to the display panel. BRIEF DESCRIPTION OF THE DRAWINGS

[0046] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the following briefly introduces the drawings required for use in the description of the embodiments. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without any creative work.

[0047] FIG1 is a schematic structural diagram of a display panel provided in an embodiment of the present application;

[0048] FIG2 is a top view of a substrate and a pixel unit provided in an embodiment of the present application;

[0049] FIG3 is a partial top view of a hexagonal grid provided in an embodiment of the present application;

[0050] FIG4 is a partial schematic diagram of an organic insulating layer provided in an embodiment of the present application;

[0051] FIG5 is a partial top view of a quadrilateral grid provided in an embodiment of the present application;

[0052] FIG6 is a schematic diagram of a tapered structure provided in an embodiment of the present application;

[0053] FIG7 is a schematic diagram of another tapered structure provided in an embodiment of the present application;

[0054] FIG8 is a schematic diagram of another tapered structure provided in an embodiment of the present application;

[0055] FIG9 is a schematic diagram of an optical path provided in an embodiment of the present application;

[0056] FIG10 is a flow chart of a method for manufacturing a display panel provided in an embodiment of the present application;

[0057] FIG11 is a schematic diagram of forming an organic insulating film according to an embodiment of the present application;

[0058] FIG12 is a schematic diagram of forming a metal mask according to an embodiment of the present application;

[0059] FIG13 is a partial top view of a metal mask provided in an embodiment of the present application;

[0060] FIG14 is a schematic diagram of forming an organic insulating layer according to an embodiment of the present application;

[0061] FIG15 is a partial schematic diagram of another organic insulating layer provided in an embodiment of the present application;

[0062] FIG16 is a schematic structural diagram of a display device provided in an embodiment of the present application. DETAILED DESCRIPTION

[0063] In order to make the objectives, technical solutions and advantages of this application clearer, the implementation methods of this application will be further described in detail below with reference to the accompanying drawings.

[0064] In related technologies, OLED display panels can be displays that use red, green, and blue (RGB) primary color OLED devices to emit light independently. This type of display panel has the advantages of simple, mature manufacturing processes and easy operation. However, the production of high-resolution display panels requires high-precision masks and precise alignment, resulting in low production capacity and high costs. Furthermore, the significant differences in the lifespan, excitation rate, and attenuation of RGB primary color OLED devices can easily cause color shift in OLED display panels.

[0065] Therefore, a new OLED display panel has been proposed. It uses a combination of white OLED devices and color filters, eliminating the need for mask alignment. This OLED display panel typically uses a bottom-emission light-emitting method, greatly simplifying the vapor deposition process and enabling the production of large-scale, high-resolution OLED panels.

[0066] However, for an OLED display panel that combines a white light OLED device with a color film, light emitted by the OLED device with a larger angle will be reflected back into the OLED device, resulting in a reduced amount of light emitted by the OLED display panel and a poor display effect.

[0067] FIG1 is a schematic diagram of the structure of a display panel provided in an embodiment of the present application. Referring to FIG1 , the display panel includes: a base substrate 101 , a plurality of pixel units 102 and an organic insulating layer 103 .

[0068] FIG2 is a top view of a base substrate and a pixel unit provided in an embodiment of the present application. Referring to FIG2 , the base substrate 101 includes a display area 101 a and a peripheral area 101 b surrounding the display area 101 a.

[0069] 1 and 2 , a plurality of pixel units 102 are located in the display area 101 a , wherein each pixel unit 102 includes a driving circuit 1021 and a light emitting unit 1022 , and the light emitting unit 1022 is connected to the driving circuit 1021 to receive a driving signal provided by the driving circuit 1021 .

[0070] Furthermore, the display panel 10 includes an organic insulating layer 103 located between the driving circuit 1021 and the light-emitting unit 1022. The organic insulating layer 103 may have a via hole for connecting the light-emitting unit 1022 and the driving circuit 1021. The organic insulating layer 103 may be a planarization layer (PLN).

[0071] In the embodiment of the present application, each pixel unit 102 may have a light-emitting region, and the light-emitting region of the pixel unit 102 may be used to emit light. The portion of the organic insulating layer 103 located in the light-emitting region of the pixel unit 102, on a surface away from the substrate 101, comprises a lens assembly G. Referring to Figures 3 and 4 , the lens assembly G includes a plurality of lenses G1, with a tapered structure formed between adjacent lenses. Each tapered structure G2 includes a first surface n1 and a second surface n2 on a side away from the substrate 101.

[0072] Some of the light emitted from the light-emitting region of the pixel unit 102 may have a larger angle, causing this light to be confined within the display panel 10 and unable to exit. Disposing a lens assembly G on the side of the organic insulating layer 103 away from the base substrate 101 allows at least some of the light confined within the display panel 10 to be irradiated by the first surface n1 and second surface n2 of the tapered structure G2. Furthermore, the light irradiated by the first and second surfaces n1 and n2 can be reflected by the first and second surfaces n1 and n2 toward the light-exiting side, thereby increasing the amount of light emitted and the light extraction efficiency, thereby ensuring the luminous effect of the display panel 10.

[0073] In summary, an embodiment of the present application provides a display panel comprising a base substrate, and a plurality of pixel units and an organic insulating layer located on the base substrate. The organic insulating layer is located between the driving circuit and the light-emitting unit of the pixel unit, and the portion of the organic insulating layer located in the light-emitting region of the pixel unit has a lens assembly on its surface away from the base substrate. The lens assembly comprises a plurality of lenses, with a conical structure formed between two adjacent lenses. The conical structure, which is away from the first and second surfaces of the base substrate, can be used to reflect light confined within the display panel to the light-emitting side, thereby increasing the light output and light extraction effect, thereby ensuring the light-emitting effect of the display panel.

[0074] 3 , each conical structure G2 includes a first end G21, a second end G22, and a middle portion G23 located between the first end G21 and the second end G22. At least one of the first end G21 and the second end G22 of each conical structure G2 is connected to the first end G21 or the second end G22 of another conical structure G2. The lens assembly G corresponding to the light-emitting region of each pixel unit 102 may be an integral structure.

[0075] Optionally, the width of the orthographic projections of the first end G21 and the second end G22 of the conical structure G2 on the base substrate 101 is greater than the width of the orthographic projection of the middle portion G23 of the conical structure G2 on the base substrate 101. The width is perpendicular to the direction of the line connecting the first end G21 and the second end G22.

[0076] Optionally, the heights of the first end G21 and the second end G22 of the conical structure G2 are greater than the height of the middle portion G23 of the conical structure G2 , wherein the heights are perpendicular to the supporting surface of the base substrate 101 .

[0077] In the embodiment of the present application, the tapered structure G2 can be formed by etching a metal hard mask formed on an organic insulating film. Due to the influence of the etching process, the width and height of the middle portion G23 of the tapered structure G2 are generally smaller than those of the ends. Of course, the width and height of the middle portion G23 of the tapered structure G2 can also be greater than those of the ends.

[0078] Referring to Figure 3, the side of the tapered structure G2 away from the substrate forms a mesh structure. The mesh structure includes multiple grids arranged in an array, wherein the grids have the same shape. This allows the light emitted from the light-emitting area to be more uniform, ensuring uniform light emission.

[0079] Alternatively, referring to FIG3 , the shape of the grid may be a hexagon. Alternatively, referring to FIG5 , the shape of the grid may be a quadrilateral. The embodiment of the present application does not limit the shape of the grid.

[0080] Furthermore, referring to Figures 3 and 5 , the orthographic projection of the area enclosed by each grid (i.e., the lens G1) on the substrate 101 is circular. Because the distance from each point on the circle to the center is equal, the circular shape of the area enclosed by each grid ensures that the distance between any position on each conical structure G2 and the center of the circle is equal. This ensures uniform light extraction from any position on the first surface n1 or second surface n2 of the conical structure G2, ensuring a good display effect.

[0081] In the embodiment of the present application, due to the presence of the conical structure G2, the various film layers of the light-emitting unit 1022 subsequently formed on the side of the organic insulating layer 103 away from the base substrate 101 can not only be located on the first surface n1 and the second surface n2 of the conical structure G2, but also can be located in the area surrounded by the grid formed by multiple conical structures G2 (that is, the area where the lens is located).

[0082] The first surface n1 and the second surface n2 are both inclined surfaces, and the surface of the area where the lens is located can be a plane or an arc surface.

[0083] When the surface of the region where the lens G1 is located is an arc surface, the first surface n1, the second surface n2 of the conical structure G2, and the lens G1 can be continuously arranged on an arc surface. At any position on the arc surface, the thickness of each film layer of the light-emitting unit 1022 is not much different.

[0084] When the surface of the area where the lens is located is a plane as shown in Figure 1, since the first surface n1 and the second surface n2 of the conical structure G2 are inclined surfaces, the thickness of the film layers of the light-emitting unit 1022 located on the inclined first surface n1 and the second surface n2 is smaller than the thickness of the film layers of the light-emitting unit 1022 located on the plane.

[0085] That is, the light-emitting unit 1022 includes: an anode layer 10221, a light-emitting layer 10222, and a cathode layer 10223, which are stacked in sequence in a direction away from the base substrate 101. In addition, the display panel 101 also includes a pixel defining layer 104. The anode layer 10221 includes multiple anode patterns, and the pixel defining layer 104 includes multiple hollow areas, each of which exposes an anode pattern. The light-emitting layer 10222 includes multiple light-emitting patterns, each of which contacts an anode pattern through a hollow area. The cathode layer 10223 contacts the light-emitting pattern. Among them, the hollow area can be the light-emitting area of ​​the pixel unit 102.

[0086] The total thickness of the anode pattern, the light-emitting pattern and the cathode layer 10223 located on the first surface n1 and the second surface n2 is smaller than the total thickness of other parts of the anode pattern, the light-emitting pattern and the cathode layer 10223 .

[0087] Because thinner film thicknesses in the light-emitting unit 1022 allow for easier light emission, while thicker film thicknesses prevent light from emitting more easily, the actual light-emitting area of ​​the light-emitting region of the pixel unit 102 is the region where the first surface n1 and second surface n2 of the multiple pyramidal structures G2 are located. In other words, the actual light-emitting area of ​​the light-emitting region of the pixel unit 102 is the area of ​​the multiple pyramidal structures G2.

[0088] In the embodiment of the present application, in order to improve the luminous efficiency while providing the same current to the pixel unit 102 , it is necessary to reduce the actual luminous area of ​​the luminous region of the pixel unit 102 to increase the current density.

[0089] That is, the conditions that need to be met in the embodiments of the present application are: for the pixel unit 102, the area of ​​the conical structure G2 located in the light-emitting area of ​​the pixel unit 102 on the side away from the base substrate 101 (i.e., the actual light-emitting area) is smaller than the area of ​​the light-emitting area of ​​the pixel unit 102.

[0090] Assuming that the mesh structure includes a hexagonal grid, the following conditions must be met: S 锥 六边形 Formula (1)

[0091] Among them, S 六边形 is the area of ​​a hexagonal grid, and S 六边形 ​satisfy:

[0092] S 锥 is the area of ​​the pyramidal structure G2 within a hexagonal grid, and S 锥 Can satisfy:

[0093] Substituting formula (2) and formula (3) into formula (1) yields:

[0094] In the above formulas (2) to (4), D1 refers to the distance between the center lines of two parallel conical structures G2 in the hexagonal grid, D2 refers to the diameter of the circle of the area (lens G1) enclosed by the hexagonal grid composed of multiple conical structures G2, and θ can be the angle between the first surface n1 or the second surface n2 of the conical structure G2 and the supporting surface of the base substrate 101.

[0095] Among the light emitted from the light-emitting side of the display panel, light with a larger emission angle will be reflected back into the display panel 10 and cannot be emitted. To achieve the light extraction effect of the tapered structure G2, the emitted light needs to be reflected multiple times within the tapered structure G2, so that the light can propagate at an angle less than the critical angle of total reflection, thereby extracting the light trapped inside the display panel.

[0096] For the hexagonal grid solution, optical simulation shows that the angle θ can range from 20° (degrees) to 45°, and the range of D1 can range from 3 μm (micrometers) to 8 μm. In the embodiment of the present application, by selecting a suitable angle θ and a suitable D1, the range of D2 can be calculated according to the above formula (4).

[0097] Assuming that the mesh structure includes a quadrilateral, the following conditions must be met: 锥 四边形 Formula (5)

[0098] Among them, S 四边形 is the area of ​​a quadrilateral mesh, and S 四边形 satisfy:

[0099] S 锥 is the area of ​​the cone structure G2 within a quadrilateral grid, and S 锥 Can satisfy:

[0100] Substituting formula (6) and formula (7) into formula (5) yields:

[0101] ​In the above formulas (5) to (8), D3 refers to the distance between the center lines of two parallel conical structures G2 in the quadrilateral grid, D4 refers to the diameter of the circle of the area (lens G1) enclosed by the quadrilateral grid composed of multiple conical structures G2, and θ can be the angle between the first surface n1 or the second surface n2 of the conical structure G2 and the supporting surface of the base substrate 101.

[0102] For the quadrilateral grid solution, optical simulation shows that the angle θ can range from 20° to 45°, and the range of D3 can range from 3μm to 8μm. In the embodiment of the present application, by selecting a suitable angle θ and a suitable D3, the range of D4 can be calculated according to the above formula (4).

[0103] Since the actual luminous area of ​​the pixel unit 102 is small, the current density can be increased, thereby increasing the luminous brightness of the pixel unit 102. Combined with the light extraction effect of the tapered structure G2, the overall luminous brightness of the display panel 10 can be higher, and the display effect is better.

[0104] In the embodiment of the present application, the plurality of pixel units 102 include: a first pixel unit, a second pixel unit, and a third pixel unit, and the colors of the first pixel unit, the second pixel unit, and the third pixel unit are different from each other.

[0105] The lens assembly G includes a first type lens assembly, a second type lens assembly, and a third type lens assembly. The orthographic projection of the first type lens assembly on the substrate 101 is located in the light-emitting area of ​​the first pixel unit. The orthographic projection of the second type lens assembly on the substrate 101 is located in the light-emitting area of ​​the second pixel unit. The orthographic projection of the third type lens assembly on the substrate 101 is located in the light-emitting area of ​​the third pixel unit.

[0106] Among them, the first angle between the first surface n1 and the second surface n2 of the conical structure G2 formed by the lens G1 included in the first type of lens assembly and the supporting surface of the base substrate 101, the second angle between the first surface n1 and the second surface n2 of the conical structure G2 formed by the lens G1 included in the second type of lens assembly and the supporting surface of the base substrate 101, and the third angle between the first surface n1 and the second surface n2 of the conical structure G2 formed by the lens G1 included in the third type of lens assembly and the supporting surface of the base substrate 101 are different from each other.

[0107] Since the colors of the first pixel unit, the second pixel unit and the third pixel unit are different and the properties of the pixel units 102 of different colors are different, the lifespans of the first pixel unit, the second pixel unit and the third pixel unit are different, which results in poor display effect of the display panel after being used for a period of time.

[0108] Typically, the larger the actual light-emitting area of ​​the light-emitting region of the pixel unit 102, the lower the current density and the longer the lifespan. To balance the lifespans of pixel units 102 of different colors, the actual light-emitting area of ​​the light-emitting region of the pixel unit 102 with a shorter lifespan can be made larger than the actual light-emitting area of ​​the light-emitting region of the pixel unit 102 with a longer lifespan.

[0109] Furthermore, in the embodiment of the present application, the actual light-emitting area of ​​the light-emitting region of the pixel unit 102 refers to the sum of the areas of the first surface n1 and the second surface n2 of the pyramidal structure G2. To adjust the sum of the areas of the first surface n1 and the second surface n2 of the pyramidal structure G2, the angle between the first surface n1 and the second surface n2 of the pyramidal structure G2 and the supporting surface of the base substrate 101 can be adjusted while the width of the pyramidal structure G2 is fixed.

[0110] 6 , the larger the included angle between the first surface n1 and the second surface n2 of the pyramidal structure G2 and the supporting surface of the base substrate 101, the larger the sum of the areas of the first surface n1 and the second surface n2 of the pyramidal structure G2, and the larger the actual luminous area of ​​the luminous region of the pixel unit 102. The smaller the included angle between the first surface n1 and the second surface n2 of the pyramidal structure G2 and the supporting surface of the base substrate 101, the smaller the sum of the areas of the first surface n1 and the second surface n2 of the pyramidal structure G2, and the smaller the actual luminous area of ​​the luminous region of the pixel unit 102.

[0111] In an embodiment of the present application, by making the angles between the first surface n1 and the second surface n2 of the conical structure G2 formed by the lens included in the lens assembly G corresponding to the pixel units 102 of different colors and the supporting surface of the base substrate 101 different, the angle relationship can be adjusted based on the life relationship of the pixel units 102, thereby balancing the lifespan of the pixel units 102 of different colors.

[0112] Optionally, the first pixel unit is a blue pixel unit, the second pixel unit is a green pixel unit, and the third pixel unit is a red pixel unit. Typically, the lifespan ratio of the blue pixel unit, the green pixel unit, and the red pixel unit is 1:1.7:2. That is, the blue pixel unit has the shortest lifespan, the red pixel unit has the longest lifespan, and the green pixel unit has a lifespan longer than that of the blue pixel unit and shorter than that of the red pixel unit.

[0113] To balance the lifespan of pixel unit 102, the actual light-emitting area of ​​the light-emitting region of the blue pixel unit needs to be larger than the actual light-emitting area of ​​the light-emitting region of the green pixel unit, and the actual light-emitting area of ​​the light-emitting region of the green pixel unit needs to be larger than the actual light-emitting area of ​​the light-emitting region of the red pixel unit. Therefore, the first angle α1 needs to be larger than the second angle α2, and the second angle α2 needs to be larger than the third angle α3. Figure 6 shows the angular relationship of the conical structure formed by the lenses corresponding to pixel units of different colors, and is not intended to represent the positional relationship of the conical structures corresponding to pixel units of different colors.

[0114] Optionally, the first angle may be in a range of 56° to 60°, the second angle may be in a range of 40° to 44°, and the third angle may be in a range of 29° to 33°. For example, the first angle is 58°, the second angle is 42°, and the third angle is 31°.

[0115] In the embodiment of the present application, the actual light-emitting area of ​​the light-emitting region of the pixel unit 102 can be adjusted by adjusting the angle between the first surface n1 and the second surface n2 of the conical structure G2 and the supporting surface of the base substrate 101, thereby adjusting the current density of the pixel unit 102 and thus adjusting the life of the pixel unit 102. Optionally, assuming that the ratio of the current density of the two pixel units 102 is 1:2, the ratio of the life of the two pixel units 102 is 2 1.5 :1.

[0116] Furthermore, the plurality of pixel units 102 may also include a fourth pixel unit. If the fourth pixel unit is a white pixel unit 102, a lens assembly G may be provided in the light-emitting area of ​​the fourth pixel unit, or a lens assembly G may not be provided. This embodiment of the present application does not limit this.

[0117] In the embodiment of the present application, the conical structure G2 includes: a first section line of the first surface n1 and a second section line of the second surface n2. The first section line and the second section line are both straight lines. For example, referring to FIG6 , the conical structure G2 can be a triangular pyramid structure.

[0118] Alternatively, the first section line and the second section line are both curves. For example, referring to FIG7 , the conical structure G2 may be a pointed conical structure; referring to FIG8 , the conical structure G2 may be an arc-shaped conical structure.

[0119] The first and second section lines are sections of the middle portion G23 of the conical structure G2 on a reference plane. The reference plane is perpendicular to the length of the conical structure G2 and perpendicular to the supporting surface of the base substrate 101. The first and second section lines are symmetrical with respect to the central axis of the conical structure G2.

[0120] In the embodiment of the present application, the lens assembly G can be located not only in the light-emitting area of ​​the pixel unit 102, but also in other areas (for example, it can be located at any position in the display area 101a of the display panel 10). The embodiment of the present application does not limit the setting position of the lens assembly G.

[0121] In the embodiment of the present application, referring to FIG1 , the display panel 10 further includes a color filter layer 105 located between the organic insulating layer 103 and the driving circuit 1021. The color filter layer 105 includes color resist blocks 1051 of different colors. The orthographic projection of each color resist block 1051 on the base substrate 101 covers the light-emitting area of ​​one pixel unit 102.

[0122] For example, the color filter layer 105 includes a blue color resist block, a green color resist block, and a red color resist block. The orthographic projection of the blue color resist block on the base substrate 101 covers the light-emitting area of ​​the blue pixel unit, the orthographic projection of the green color resist block on the base substrate 101 covers the light-emitting area of ​​the green pixel unit, and the orthographic projection of the red color resist block on the base substrate 101 covers the light-emitting area of ​​the red pixel unit.

[0123] Optionally, the light-emitting side of the display panel 10 is a side of the base substrate 101 away from the pixel unit 102. That is, the display panel 10 is a bottom-emitting display panel.

[0124] Referring to Figure 9 , the first surface n1 and the second surface n2 are used to reflect light from one side of the base substrate 101. Furthermore, the light reflected from the first surface n1 and the second surface n2 passes through the color block 1051 and then exits from the side of the base substrate 101 away from the pixel unit 102. Thus, light confined within the display panel 10 can be reflected by the first surface n1 or the second surface n2 before exiting through the color block 1051, thereby increasing the amount of light emitted from the display panel 10 and improving the display quality.

[0125] Figure 9 only illustrates the optical paths of two light rays in the organic insulating layer 103. Light 1 is a planar, high-angle light ray that undergoes total reflection at the interface between substrate 101 and air, preventing it from exiting. Light 2 is an inclined, high-angle light ray. After reflecting off the inclined surface of the tapered structure G2, its optical path is altered, allowing it to exit, enhancing light extraction efficiency.

[0126] In the embodiment of the present application, the driving circuit 1021 of each pixel unit 102 may include multiple thin film transistors and at least one storage capacitor. Optionally, the driving circuit 1021 may include seven thin film transistors and one storage capacitor, that is, the driving circuit 1021 is a 7T1C driving circuit. Alternatively, the driving circuit 1021 may include other numbers of thin film transistors and other numbers of storage capacitors. The embodiment of the present application does not limit the number of thin film transistors included in the driving circuit 1021, nor the number of storage capacitors included.

[0127] Each thin film transistor includes a gate, a source, and a drain. The multiple thin film transistors included in the driving circuit 1021 are interconnected to drive the light-emitting unit 1022 to emit light. FIG1 shows only one thin film transistor in the driving circuit 1021 connected to the light-emitting unit 1022.

[0128] 1 , the driving circuit 1021 includes a gate layer m1 , a gate insulating layer m2 , an active layer m3 , a source / drain electrode layer m4 , and an inorganic insulating layer m5 , which are stacked in sequence and located on one side of a base substrate 101 .

[0129] The gate layer m1 may include multiple gate patterns, each of which may serve as a gate of a thin film transistor. The active layer m3 may include multiple active patterns. The source-drain layer m4 may include multiple source patterns and multiple drain patterns, each of which is connected to a corresponding active pattern. Each source pattern and the corresponding drain pattern may serve as the source and drain of a thin film transistor. The inorganic insulating layer m5 may be a passivation layer (PVX).

[0130] In summary, an embodiment of the present application provides a display panel comprising a base substrate, and a plurality of pixel units and an organic insulating layer located on the base substrate. The organic insulating layer is located between the driving circuit and the light-emitting unit of the pixel unit, and the portion of the organic insulating layer located in the light-emitting region of the pixel unit has a lens assembly on its surface away from the base substrate. The lens assembly comprises a plurality of lenses, with a conical structure formed between two adjacent lenses. The conical structure, which is away from the first and second surfaces of the base substrate, can be used to reflect light confined within the display panel to the light-emitting side, thereby increasing the light output and light extraction effect, thereby ensuring the light-emitting effect of the display panel.

[0131] FIG10 is a flow chart of a method for manufacturing a display panel according to an embodiment of the present application. Referring to FIG10 , the method includes:

[0132] Step S101: Obtain a base substrate.

[0133] In the embodiment of the present application, when preparing the display panel 10, a base substrate 101 may be obtained first. The base substrate 101 may be a glass substrate or a flexible substrate, which is not limited in the embodiment of the present application.

[0134] Step S102 : forming a driving circuit included in a plurality of pixel units.

[0135] In the embodiment of the present application, various film layers of the driving circuit 1021 may be sequentially formed on the base substrate 101. For example, a gate layer, a gate insulating layer, an active layer, a source and drain electrode layer, and an inorganic insulating layer may be sequentially formed.

[0136] The gate layer, active layer and source / drain electrode layer are all prepared by patterning process, which includes photoresist coating, exposure, development, etching and photoresist removal.

[0137] Step S103 : forming an organic insulating film on a side of the driving circuit away from the base substrate.

[0138] In an embodiment of the present application, referring to FIG11 , an organic insulating film may be formed on a side of the driving circuit 1021 away from the base substrate 101. The surface of the organic insulating film away from the base substrate 101 may be a flat surface. The material of the organic insulating film may be resin.

[0139] Step S104 : forming a metal mask on a side of the organic insulating film away from the base substrate.

[0140] In an embodiment of the present application, referring to FIG12 , a metal film can be first formed on the side of the organic insulating film away from the base substrate 101, and then the metal film can be patterned to form a metal mask. Referring to FIG13 , the shape of the metal mask can be roughly the shape of the tapered structure G2 to be subsequently formed. Optionally, the metal mask can be made of molybdenum (Mo), or other metal materials, which are not limited in this embodiment of the present application.

[0141] Step S105 : etching the organic insulating film using a metal mask to obtain an organic insulating layer.

[0142] In the embodiment of the present application, referring to FIG14 , after forming the metal mask, the organic insulating film can be etched based on the metal mask to form the organic insulating layer 103. Part of the organic insulating material on the surface of the organic insulating film away from the base substrate 101 where the metal mask is not present will be etched away, while the organic insulating material on the surface where the metal mask is present will remain.

[0143] Optionally, the lens assembly G includes a plurality of lenses, with a tapered structure G2 formed between two adjacent lenses. Each tapered structure G2 includes a first surface n1 and a second surface n2 on a side away from the base substrate 101. The first surface n1 and the second surface n2 are both used to increase the amount of light emitted, thereby ensuring the luminous effect of the display panel 10.

[0144] The shape of the tapered structure G2 on the surface of the organic insulating layer 103 away from the base substrate 101 is roughly the same as the shape of the metal mask, but the dimensions may differ due to etching process deviations. For example, the width of the metal mask can be greater than the width of the top end of the tapered structure G2 (the end away from the base substrate 101) and can be less than or equal to the width of the bottom end of the tapered structure G2 (the end closer to the base substrate 101).

[0145] It should be noted that, for a pointed cone structure, reactive ion etching (RIE) can be used for etching. For an arc-shaped cone structure, the photoresist used for etching can be a positive photoresist.

[0146] Figure 15 is a partial schematic diagram of another organic insulating layer provided in an embodiment of the present application. In Figure 15 , the distance h1 between the surface of the organic insulating layer 103 closest to the base substrate 101 and the top of the pyramidal structure G2 is 2.15 μm. The distance h2 between the surface of the organic insulating layer 103 closest to the base substrate and the surface of the organic insulating layer 103 facing away from the base substrate 101 without the pyramidal structure G2 is 1.47 μm. The width h3 of the base of the pyramidal structure G2 is 1.04 μm, and the distance h4 between two parallel pyramidal structures G2 is 3.19 μm.

[0147] Step S106: remove the metal mask.

[0148] In the embodiment of the present application, the metal mask can be removed after the organic insulating film is etched to obtain the lens assembly G. That is, the final display panel will not include the metal mask, which is only used to prepare the tapered structure G2.

[0149] Step S107 : forming a plurality of light-emitting units including pixel units on a side of the organic insulating layer away from the base substrate.

[0150] In the embodiment of the present application, after forming the organic insulating layer 103, a plurality of light-emitting units 1022 included in the pixel units 102 may be formed on a side of the organic insulating layer 103 away from the base substrate 101. The light-emitting units 1022 are connected to the driving circuit 1021 to receive driving signals provided by the driving circuit 1021.

[0151] The process of forming the light-emitting unit 1022 includes: forming an anode layer 10221 on a side of the organic insulating layer 103 away from the base substrate 101, the anode layer 10221 including multiple anode patterns; forming a pixel defining layer 104 on a side of the anode layer 10221 away from the base substrate 101, the pixel defining layer 104 having multiple hollow regions, each hollow region exposing an anode pattern; forming a light-emitting layer 10222, the light-emitting layer 10222 including multiple light-emitting patterns, each light-emitting pattern being located in a hollow region and in contact with the anode pattern exposed in the hollow region; forming a cathode layer 10223 on a side of the light-emitting layer 10222 away from the base substrate 101, the cathode layer 10223 being shared by multiple light-emitting units 1022. Optionally, the material of the anode layer 10221 can be indium tin oxide (ITO). The light-emitting layer 10222 and the cathode layer 10223 can be prepared by an evaporation process.

[0152] Furthermore, after forming the plurality of light emitting units 1022 , the plurality of light emitting units 1022 may be packaged, that is, a packaging film layer may be formed on a side of the plurality of light emitting units 1022 away from the base substrate 101 .

[0153] Optionally, the encapsulation film layer may include: a first film layer, a second film layer, and a third film layer stacked in a direction away from the base substrate 101 .

[0154] Optionally, the first film layer and the third film layer may be made of an inorganic material, and the second film layer may be made of an organic material. For example, the first film layer and the third film layer may be made of one or more inorganic oxides such as SiNx, SiOx, and SiOxNy. The second film layer may be made of a resin material. The resin may be a thermoplastic resin or a thermoplastic resin. The thermoplastic resin may include acrylic (PMMA) resin, and the thermosetting resin may include epoxy resin.

[0155] In the embodiment of the present application, the second film layer may be manufactured by inkjet printing (IJP), and the first film layer and the third film layer may be manufactured by chemical vapor deposition (CVD).

[0156] In summary, an embodiment of the present application provides a method for preparing a display panel, wherein the display panel prepared by the method includes a base substrate, and a plurality of pixel units and an organic insulating layer located on the base substrate. The organic insulating layer is located between the driving circuit and the light-emitting unit of the pixel unit, and the portion of the organic insulating layer located in the light-emitting area of ​​the pixel unit has a lens assembly on the surface away from the base substrate. The lens assembly includes a plurality of lenses, and a conical structure is formed between two adjacent lenses. The conical structure is away from the first surface and the second surface of the base substrate, which can be used to reflect light confined inside the display panel to the light-emitting side, thereby increasing the light output and light extraction effect, and ensuring the light-emitting effect of the display panel.

[0157] FIG16 is a schematic diagram of the structure of a display device provided in an embodiment of the present application. Referring to FIG16 , a power supply component 20 and a display panel 10 provided in the above embodiment are shown. The power supply component 20 is used to supply power to the display panel 10.

[0158] Optionally, the display device may be an organic light-emitting diode (OLED) display device. The display device may be any suitable display device, including but not limited to mobile phones, tablet computers, televisions, monitors, laptop computers, digital photo frames, navigation devices, e-books, and any other product or component with a display function.

[0159] Since the display device can have substantially the same technical effects as the display panel described in the previous embodiment, the technical effects of the display device will not be repeatedly described here for the purpose of brevity.

[0160] The terms used in the embodiments of this application are only used to explain the embodiments of this application and are not intended to limit this application. Unless otherwise defined, the technical terms or scientific terms used in the embodiments of this application should have the common meaning understood by people with ordinary skills in the field to which this application belongs.

[0161] The terms used in the embodiments of this application are intended solely to illustrate the embodiments of this application and are not intended to limit this application. Unless otherwise defined, technical or scientific terms used in the embodiments of this application should have the same ordinary meaning as those understood by persons of ordinary skill in the art to which this application belongs. The terms "first," "second," "third," and similar terms used in this patent specification and claims do not denote any order, quantity, or importance, but are simply used to distinguish between different components. Similarly, terms such as "a" or "an" do not denote a limitation of quantity, but rather denote the presence of at least one. Terms such as "include" or "comprising" and similar terms mean that the elements or objects listed before "include" or "comprising" include the elements or objects listed after "include" or "comprising," and their equivalents, and do not exclude other elements or objects. Terms such as "connected" or "connected" are not limited to physical or mechanical connections but may include electrical connections, whether direct or indirect. Terms such as "upper," "lower," "left," and "right" are used solely to indicate relative positions. When the absolute position of the described objects changes, the relative positions may also change accordingly.

[0162] The above description is merely an optional embodiment of the present application and is not intended to limit the present application. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principles of the present application shall be included in the scope of protection of the present application.

Claims

1. A display panel, characterized in that, The display panel includes: a substrate substrate, the substrate substrate including a display area and a peripheral area surrounding the display area; a plurality of pixel units, the plurality of pixel units being located on one side of the substrate substrate and within the display area; wherein each of the pixel units includes a driving circuit and a light-emitting unit, the light-emitting unit being connected to the driving circuit for receiving a driving signal provided by the driving circuit; and an organic insulating layer, the organic insulating layer being located between the driving circuit and the light-emitting unit; wherein a portion of the organic insulating layer located in the light-emitting area of the pixel unit has a lens assembly on a surface away from the substrate substrate, the lens assembly including a plurality of lenses, a tapered structure being formed between adjacent lenses, and at least one side of the tapered structure away from the substrate substrate including a first surface and a second surface.

2. The display panel according to claim 1, wherein Each of the tapered structures includes a first end, a second end, and a middle portion located between the first end and the second end, and at least one of the first end and the second end of each of the tapered structures is connected to the first end or the second end of another tapered structure; The width of the orthographic projection of the first end and the second end of the tapered structure on the substrate substrate is greater than the width of the orthographic projection of the middle portion of the tapered structure on the substrate substrate, the width being perpendicular to the direction of the line connecting the first end and the second end.

3. The display slow board according to claim 1, wherein, Each of the tapered structures includes a first end, a second end, and a middle portion located between the first end and the second end, and at least one of the first end and the second end of each of the tapered structures is connected to the first end or the second end of another tapered structure; The height of the first end and the second end of the tapered structure is greater than the height of the middle portion of the tapered structure, the height being perpendicular to the bearing surface of the substrate substrate.

4. The display panel according to claim 1, wherein A mesh structure is formed on a side of the tapered structure away from the substrate substrate, the mesh structure including a plurality of meshes arranged in an array, wherein the shapes of the plurality of meshes are the same.

5. The display panel according to claim 4, wherein In the mesh structure, the shape of at least one of the meshes is a quadrilateral or a hexagon.

6. The display panel according to claim 4, wherein The shape of the orthographic projection of the area enclosed by at least one of the meshes on the substrate substrate is a circle.

7. The display panel according to any one of claims 1 to 6, characterized in that For the pixel unit, the area of the side of the tapered structure located in the light-emitting area of the pixel unit away from the substrate substrate is smaller than the area of the light-emitting area of the pixel unit.

8. The display panel according to any one of claims 1 to 6, characterized in that, The light-emitting unit includes: an anode layer, a light-emitting layer, and a cathode layer stacked in sequence in a direction away from the substrate substrate, and the display panel further includes a pixel defining layer; The anode layer includes a plurality of anode patterns, the pixel defining layer includes a plurality of hollowed-out areas, each of the hollowed-out areas exposing one of the anode patterns, the light-emitting layer includes a plurality of light-emitting patterns, each of the light-emitting patterns contacting one of the anode patterns through one of the hollowed-out areas, and the cathode layer contacts the light-emitting patterns; wherein the hollowed-out areas are the light-emitting areas; Among them, the total thickness of the portions of the anode pattern, the light-emitting pattern, and the cathode layer located on the first surface and the second surface is less than the total thickness of the other portions of the anode pattern, the light-emitting pattern, and the cathode layer.

9. The display panel according to any one of claims 1 to 6, characterized in that The plurality of pixel units include: a first pixel unit, a second pixel unit, and a third pixel unit; The lens assembly includes a first type of lens assembly, a second type of lens assembly, and a third type of lens assembly. The orthographic projection of the first type of lens assembly on the substrate is located in the light-emitting area of the first pixel unit. The orthographic projection of the second type of lens assembly on the substrate is located in the light-emitting area of the second pixel unit. The orthographic projection of the third type of lens assembly on the substrate is located in the light-emitting area of the third pixel unit; Among them, the first angle between the first surface and the second surface of the conical structure formed by the lenses included in the first type of lens assembly and the bearing surface of the substrate, the second angle between the first surface and the second surface of the conical structure formed by the lenses included in the second type of lens assembly and the bearing surface of the substrate, and the third angle between the first surface and the second surface of the conical structure formed by the lenses included in the third type of lens assembly and the bearing surface of the substrate are different from each other.

10. The display panel according to claim 9, characterized in that, The first pixel unit is a blue pixel unit, the second pixel unit is a green pixel unit, and the third pixel unit is a red pixel unit; The first angle is greater than the second angle, and the second angle is greater than the third angle.

11. The display panel according to claim 10, wherein The range of the first angle is 56 degrees to 60 degrees, the range of the second angle is 40 degrees to 44 degrees, and the range of the third angle is 29 degrees to 33 degrees.

12. The display panel according to any one of claims 1 to 6, characterized in that, The conical structure includes: a first intercept line of the first surface and a second intercept line of the second surface; Both the first intercept line and the second intercept line are straight lines; or both the first intercept line and the second intercept line are curves; Among them, both the first intercept line and the second intercept line are the intercept lines of the middle part of the conical structure on the reference plane. The reference plane is perpendicular to the length direction of the conical structure and perpendicular to the bearing surface of the substrate. The first intercept line and the second intercept line are symmetric with respect to the central axis of the conical structure along the length direction.

13. The display panel according to any one of claims 1 to 6, characterized in that The display panel further includes: a color filter layer located between the organic insulating layer and the driving circuit. The color filter layer includes a plurality of color resist blocks of different colors; The orthographic projection of each color resist block on the substrate covers the light-emitting area of one pixel unit.

14. The display panel according to claim 13, wherein The light-emitting side of the display panel is the side of the substrate away from the pixel unit; The first surface and the second surface are used to reflect the light from one side of the substrate, and the light reflected by the first surface and the second surface exits from the side of the substrate away from the pixel unit after passing through the color resist block.

15. A method for preparing a display panel, characterized in that, The method includes: Obtaining a substrate, the substrate including a display area and a peripheral area surrounding the display area; Forming the driving circuits included in the plurality of pixel units; An organic insulating film is formed on a side of the driving circuit away from the substrate; A metal mask is formed on a side of the organic insulating film away from the substrate; The organic insulating film is etched using the metal mask to obtain the organic insulating layer; The metal mask is removed; A light-emitting unit included in a plurality of pixel units is formed on a side of the organic insulating layer away from the substrate, and the light-emitting unit is connected to the driving circuit and is configured to receive a driving signal provided by the driving circuit; Wherein, a surface of a portion of the organic insulating layer located in a light-emitting region of the pixel unit away from the substrate has a lens assembly, the lens assembly includes a plurality of lenses, a conical structure is formed between adjacent lenses, and at least one side of the conical structure away from the substrate includes a first surface and a second surface.

16. A display device, characterized in that, The display device includes: a power supply component and the display panel according to any one of claims 1 to 14; Wherein, the power supply component is configured to supply power to the display panel.

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