Display panel and preparation method therefor, and display apparatus

Abstract

A display panel, comprising a driving backplane, a pixel defining layer and a plurality of light-emitting devices, wherein the pixel defining layer is located on one side of the driving backplane and is provided with a plurality of openings; each light-emitting device comprises a normal element and at least one peep-proof element, and the peep-proof element and the normal element are located in different openings; and the gradient angle of the pixel defining layer on at least a local edge of the opening in which the peep-proof element is located is greater than the gradient angle of the pixel defining layer on the edge of the opening in which the normal element is located.

Description

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

[0001] The embodiments of the present disclosure belong to the field of display technology, and particularly relate to a display panel, a manufacturing method thereof, and a display device. Background Art

[0002] OLED (Organic Light-Emitting Diode) displays have attracted widespread attention due to their advantages such as self-luminescence, low power consumption, lightness, flexibility, brilliant colors, high contrast, and fast response rate.

[0003] Summary of the Invention

[0004] In a first aspect, an embodiment of the present disclosure provides a display panel, comprising a driving backplane, a pixel defining layer, and a plurality of light-emitting devices.

[0005] The pixel defining layer is located on one side of the driving backplane, and a plurality of openings are formed in the pixel defining layer;

[0006] The light emitting device includes a normal element and at least one anti-peeping element, wherein the anti-peeping element and the normal element are respectively located in different openings;

[0007] The slope angle of the pixel defining layer at at least a partial edge of the opening where the privacy protection element is located is greater than the slope angle of the pixel defining layer at the edge of the opening where the normal element is located.

[0008] In some embodiments, the slope angle of the pixel defining layer at the edge of the opening where the privacy protection element is located ranges from 60° to 90°;

[0009] The slope angle of the pixel defining layer at the opening edge where the normal element is located ranges from 20° to 30°.

[0010] In some embodiments, the pixel definition layer is made of black light absorbing material.

[0011] In some embodiments, a surface of the pixel definition layer between the adjacent normal element and the anti-peeping element, which is away from the driving backplane, is a curved surface.

[0012] The points on the arc surface that are farthest from the driving back plate are connected to form a line, and the distance between the orthographic projection of the line on the driving back plate and the orthographic projection of the first edge of the opening where the privacy protection element is located on the driving back plate is smaller than the distance between the orthographic projection of the line on the driving back plate and the orthographic projection of the second edge of the opening where the normal element is located on the driving back plate;

[0013] The orthographic projections of the first edge and the second edge on the driving backplane are located between the orthographic projections of the normal element and the privacy protection element on the driving backplane, and the orthographic projections of the first edge and the second edge on the driving backplane are adjacent.

[0014] In some embodiments, the distance A between the point on the arc surface farthest from the driving backplate and the driving backplate is calculated as follows: tanθ=A / D; tanθ1=A / (DB); tanθ2=A / [C-(DB)]; A=tanθ*D=tanθ1*(DB)=tanθ2*[C-(DB)];

[0015] Wherein, B is the opening width of the opening where the privacy protection element is located along the arrangement direction of the privacy protection element and the normal elements;

[0016] C is the maximum width of the pixel definition layer located between the adjacent privacy protection elements and the normal elements along the arrangement direction of the privacy protection elements and the normal elements;

[0017] D is the sum of the distance between the orthographic projection of the point on the arc surface farthest from the driving backplane and the orthographic projection of the first edge on the driving backplane, plus B, along the arrangement direction of the privacy protection element and the normal element;

[0018] θ=90°-α / 2; wherein α is the viewing angle of the anti-peeping element;

[0019] θ1 is the slope angle of the pixel defining layer at the edge of the opening where the privacy protection element is located;

[0020] θ2 is the slope angle of the pixel defining layer at the opening edge where the normal element is located.

[0021] In some embodiments, a surface of the pixel definition layer between two adjacent privacy protection elements, which is away from the driving backplane, is a curved surface.

[0022] The two adjacent privacy protection elements are respectively a first privacy protection element and a second privacy protection element;

[0023] The points on the arc surface that are farthest from the driving back plate are connected to form a line, and the distance between the orthographic projection of the line on the driving back plate and the orthographic projection of the first edge of the opening where the first privacy protection element is located on the driving back plate is equal to the distance between the orthographic projection of the line on the driving back plate and the orthographic projection of the second edge of the opening where the second privacy protection element is located on the driving back plate;

[0024] The orthographic projections of the first edge and the second edge on the driving backplane are located between the orthographic projections of the first privacy protection element and the second privacy protection element on the driving backplane, and the orthographic projections of the first edge and the second edge on the driving backplane are adjacent.

[0025] In some embodiments, the distance A1 between the point on the arc surface farthest from the driving backplate and the driving backplate is calculated as follows: tanθ3=A1 / D1; tanθ4=A1 / (D1-B1); tanθ5=A1 / [C1-(D1-B1)]; A1=tanθ3*D1=tanθ4*(D1-B1)=tanθ5*[C1-(D1-B1)];

[0026] Wherein, B1 is the opening width of the opening where the first privacy protection element is located along the arrangement direction of the first privacy protection element and the second privacy protection element;

[0027] C1 is the maximum width of the pixel definition layer located between the first privacy protection element and the second privacy protection element along the arrangement direction of the first privacy protection element and the second privacy protection element;

[0028] D1 is the sum of the distance between the orthographic projection of the point on the arc surface farthest from the driving backplane and the orthographic projection of the first edge on the driving backplane, plus B1, along the arrangement direction of the first privacy protection element and the second privacy protection element;

[0029] θ3=90°-α / 2; wherein α is the visual angle of the first anti-peeping element;

[0030] θ4 is the slope angle of the pixel defining layer at the edge of the opening where the first privacy protection element is located;

[0031] θ5 is the slope angle of the pixel defining layer at the edge of the opening where the second privacy protection element is located.

[0032] In some embodiments, a surface of the pixel definition layer between two adjacent normal elements, which is away from the driving backplane, is a curved surface.

[0033] The two adjacent normal elements are respectively a first normal element and a second normal element;

[0034] The points on the arc surface that are farthest from the driving backplane are connected to form a line, and the distance between the orthographic projection of the line on the driving backplane and the orthographic projection of the first edge of the opening where the first normal element is located on the driving backplane is equal to the distance between the orthographic projection of the line on the driving backplane and the orthographic projection of the second edge of the opening where the second normal element is located on the driving backplane;

[0035] The orthographic projections of the first edge and the second edge on the driving backplane are located between the orthographic projections of the first normal element and the second normal element on the driving backplane, and the orthographic projections of the first edge and the second edge on the driving backplane are adjacent.

[0036] In some embodiments, the distance A2 between the point on the arc surface farthest from the driving backplate and the driving backplate is calculated as follows: tanθ6=A2 / D2; tanθ7=A2 / (D2-B2); tanθ8=A2 / [C2-(D2-B2)]; A2=tanθ6*D2=tanθ7*(D2-B2)=tanθ8*[C2-(D2-B2)];

[0037] Wherein, B2 is the opening width of the opening where the first normal element is located along the arrangement direction of the first normal element and the second normal element;

[0038] C2 is the maximum width of the pixel definition layer located between the first normal element and the second normal element along the arrangement direction of the first normal element and the second normal element;

[0039] D2 is the sum of the distance between the orthographic projection of the point on the arc surface farthest from the driving backplane and the orthographic projection of the first edge on the driving backplane, plus B2, along the arrangement direction of the first normal elements and the second normal elements;

[0040] θ6=90°-α1 / 2; where α1 is the viewing angle of the first normal element;

[0041] θ7 is the slope angle of the pixel defining layer at the opening edge where the first normal element is located;

[0042] θ8 is the slope angle of the pixel defining layer at the opening where the second normal element is located.

[0043] In some embodiments, α ranges from 40° to 50°.

[0044] In some embodiments, α1 ranges from 120° to 160°.

[0045] In some embodiments, the plurality of light emitting devices includes a plurality of red light emitting devices, a plurality of green light emitting devices, and a plurality of blue light emitting devices.

[0046] The red light emitting device includes a red anti-peeping element and a red normal element;

[0047] The green light emitting device includes a green anti-peeping element and a green normal element;

[0048] The blue light emitting device includes a blue anti-peeping element and a blue normal element;

[0049] The slope angles of the pixel defining layers at the opening edges where the red privacy protection element, the green privacy protection element, and the blue privacy protection element are located are the same;

[0050] The slope angles of the pixel defining layer at the opening edge where the red normal element, the green normal element, and the blue normal element are located are the same.

[0051] In some embodiments, the first light shielding structure is further included, located on a side of the pixel defining layer away from the driving backplane;

[0052] The orthographic projection of the first shading structure on the driving back plate is located at the edge of the orthographic projection of the opening where the privacy protection element is located on the driving back plate, and the orthographic projection of the first shading structure on the driving back plate at least covers the orthographic projection of a line formed by connecting the points on the curved surface farthest from the driving back plate on the driving back plate.

[0053] In some embodiments, it further includes an encapsulation layer and a second light shielding structure.

[0054] The encapsulation layer is located on a side of the first light-shielding structure away from the driving backplane, and the encapsulation layer is used to encapsulate the light-emitting device;

[0055] The encapsulation layer includes three or more sub-layers, and the three or more sub-layers are stacked sequentially away from the driving backplane.

[0056] The second light-shielding structure is at least located between some of the adjacent sub-layers;

[0057] The orthographic projection of the second light-shielding structure on the driving backplane is located at the edge of the orthographic projection of the opening where the privacy protection element is located on the driving backplane, and the orthographic projection of the second light-shielding structure on the driving backplane at least partially overlaps with the orthographic projection of the first light-shielding structure on the driving backplane.

[0058] In some embodiments, the width W of the first light shielding structure along the arrangement direction of the privacy protection element and the normal element and the height H along the direction away from the driving backplane are calculated as follows: tanθ=(A+H) / D; tanθ2=(A+H) / (CWx); tanθ1=A / x;

[0059] Wherein, A is the distance between the point on the arc surface farthest from the driving backplate and the driving backplate;

[0060] D is the sum of the distance between the orthographic projection of the point on the arc surface farthest from the driving backplane and the orthographic projection of the first edge on the driving backplane, plus B, along the arrangement direction of the privacy protection element and the normal element;

[0061] B is the opening width of the opening where the privacy protection element is located along the arrangement direction of the privacy protection element and the normal elements;

[0062] C is the maximum width of the pixel definition layer located between the adjacent privacy protection elements and the normal elements along the arrangement direction of the privacy protection elements and the normal elements;

[0063] x is the shortest distance between the orthographic projection of the first light-shielding structure on the driving backplane and the orthographic projection of the first edge on the driving backplane;

[0064] θ=90°-α / 2; wherein α is the viewing angle of the anti-peeping element;

[0065] θ1 is the slope angle of the pixel defining layer at the edge of the opening where the privacy protection element is located;

[0066] θ2 is the slope angle of the pixel defining layer at the opening edge where the normal element is located.

[0067] In some embodiments, the materials of the first light-shielding structure and the second light-shielding structure include black organic materials.

[0068] In a second aspect, an embodiment of the present disclosure provides a method for manufacturing a display panel, comprising:

[0069] Prepare a driver backplane;

[0070] A plurality of anodes of light-emitting devices are prepared on one side of the driving backplane; the preparation of the anodes of the light-emitting devices includes preparing the anodes of normal elements and the anodes of the anti-peeping elements through a single patterning process;

[0071] preparing a pixel defining layer and a plurality of openings in the pixel defining layer on a side of the anode facing away from the driving backplane;

[0072] The slope angle of the pixel defining layer at at least a partial edge of the opening where the privacy protection element is located is greater than the slope angle of the pixel defining layer at the edge of the opening where the normal element is located.

[0073] In a third aspect, an embodiment of the present disclosure further provides a display device, which includes the above-mentioned display panel. BRIEF DESCRIPTION OF THE DRAWINGS

[0074] The accompanying drawings are used to provide a further understanding of the embodiments of the present disclosure and constitute a part of the specification. Together with the embodiments of the present disclosure, they are used to explain the present disclosure and do not constitute a limitation of the present disclosure. The above and other features and advantages will become more apparent to those skilled in the art by describing the detailed exemplary embodiments with reference to the accompanying drawings, in which:

[0075] FIG1 is a schematic diagram showing the shared state and the anti-peeping state of a display product in the disclosed technology.

[0076] FIG. 2 a is a schematic top view of the structure of the display panel in an embodiment of the present disclosure.

[0077] FIG2 b is a schematic cross-sectional view of the structure along the AA section line in FIG2 a .

[0078] FIG2c is a schematic cross-sectional view of the structure along the BB section line in FIG2a.

[0079] FIG2 d is a schematic cross-sectional view of the structure along the CC cutting line in FIG2 a .

[0080] FIG2e is a schematic diagram of the luminous angle ranges of the normal element and the anti-peeping element in an embodiment of the present disclosure.

[0081] FIG2 f is a schematic cross-sectional view of another structure along the AA section line in FIG2 a .

[0082] FIG2g is a schematic cross-sectional view of another structure along the AA section line in FIG2a.

[0083] FIG2h is a schematic cross-sectional view of another structure along the AA section line in FIG2a.

[0084] FIG. 2i is a schematic cross-sectional view of another structure along the AA section line in FIG. 2a .

[0085] FIG2j is a schematic top view of the arrangement of the first light-shielding structure and the second light-shielding structure in an embodiment of the present disclosure.

[0086] FIG. 3 a is a schematic diagram of step S032 in a method for manufacturing a display panel according to an embodiment of the present disclosure.

[0087] FIG3 b is a schematic diagram of step S033 in a method for manufacturing a display panel according to an embodiment of the present disclosure.

[0088] FIG3 c is a diagram comparing the parameters and effects of the slope angle of the pixel defining layer formed by a hot-in, cold-out heat box in a method for manufacturing a display panel according to an embodiment of the present disclosure.

[0089] FIG3 d is a schematic diagram of another method for manufacturing a display panel according to an embodiment of the present disclosure. DETAILED DESCRIPTION

[0090] To enable those skilled in the art to better understand the technical solutions of the embodiments of the present disclosure, a display panel, a manufacturing method thereof, and a display device provided by the embodiments of the present disclosure are further described in detail below with reference to the accompanying drawings and specific implementation methods.

[0091] The embodiments of the present disclosure will be described more fully below with reference to the accompanying drawings, but the illustrated embodiments may be embodied in different forms and should not be construed as limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete and will fully enable those skilled in the art to understand the scope of this disclosure.

[0092] The embodiments of the present disclosure are not limited to the embodiments shown in the drawings, but include modifications of the configurations formed based on the manufacturing process. Therefore, the regions illustrated in the drawings are schematic in nature, and the shapes of the regions shown in the drawings illustrate specific shapes of the regions, but are not intended to be limiting.

[0093] In the disclosed technology, refer to Figure 1, which is a schematic diagram of the shared state and anti-peeping state of the display product in the disclosed technology; as display applications become more and more numerous, we like to share information with others, but in special circumstances we also hope to have privacy, such as when processing confidential information, the information is easily seen by others nearby; for example, when entering personal information on a mobile phone, the personal information is also easily seen by others; therefore, the display product's ability to switch between the shared state and the anti-peeping state during display has gradually become a demand trend for display products.

[0094] Based on the demand for display products to switch between a shared state and an anti-peeping state during display, there is a public technology that uses an external anti-peeping film on the display screen. When privacy is required, the anti-peeping film is manually hung in front of the display screen, and when it is not needed, the anti-peeping film is manually removed. There is also a public technology that sets a liquid crystal layer on the display side of the display screen, and limits the light output angle of the display screen by steering the liquid crystal in the liquid crystal layer.

[0095] Manually hanging the anti-peep film is more troublesome to operate, and it is impossible to achieve flexible and convenient switching between the shared state and the anti-peep state; setting a liquid crystal layer on the display side of the display increases the thickness of the display and cannot well meet user needs.

[0096] In order to solve the problem that the shared state and anti-peeping state switching of the display product cannot be realized conveniently and quickly in the disclosed technology, the present embodiment provides a display panel, referring to Figure 2a, which is a schematic top view of the structure of the display panel in the disclosed embodiment; Figure 2b, a schematic cross-sectional view of the structure along the AA cutting line in Figure 2a; Figure 2c, a schematic cross-sectional view of the structure along the BB cutting line in Figure 2a; Figure 2d, a schematic cross-sectional view of the structure along the CC cutting line in Figure 2a; wherein, it includes a driving backplane 1, a pixel defining layer 2 and a plurality of light-emitting devices 3, the pixel defining layer 2 is located on one side of the driving backplane 1, and a plurality of openings are opened in the pixel defining layer 2; the light-emitting device 3 includes a normal element 31 and at least one anti-peeping element 32, the anti-peeping element 32 and the normal element 31 are respectively located in different openings; the slope angle of the pixel defining layer 2 at at least a partial edge of the opening where the anti-peeping element 32 is located is greater than the slope angle of the pixel defining layer 2 at the edge of the opening where the normal element 31 is located.

[0097] Among them, the slope angle of the pixel defining layer 2 at the edge of the opening where the anti-peep element 32 is located refers to the angle between the surface of the pixel defining layer 2 in contact with the driving backplane 1 at the opening position where the anti-peep element 32 is located and the side wall of the opening. The slope angle of the pixel defining layer 2 at the edge of the opening where the normal element 31 is located refers to the angle between the surface of the pixel defining layer 2 in contact with the driving backplane 1 at the opening position where the normal element 31 is located and the side wall of the opening. Referring to Figure 2e, it is a schematic diagram of the light-emitting angle range of the normal element and the anti-peep element in the embodiment of the present disclosure; the normal element 31 refers to the angle range of the light emitted by its light-emitting surface of 120° to 160°, that is, assuming that the light-emitting surface (a plane) of the normal element 31 emits light in the angle range of 120°, then the normal element 31 emits light in the range of 30° to 150° with its light-emitting surface. The anti-peeping element 32 means that the angle range of the light emitted by its light-emitting surface is 40° to 50°. That is, if the light-emitting surface (a flat surface) of the anti-peeping element 32 emits light at an angle of 30°, the anti-peeping element 32 emits light at an angle of 75° to 105° with its light-emitting surface.

[0098] In some embodiments, both the normal element 31 and the anti-peeping element 32 are OLED (Organic Light-Emitting Diode) devices.

[0099] In some embodiments, referring to Figures 2a and 2b, a light-emitting device 3 is divided into two (for example, a light-emitting device 3 of the same luminous color is divided into two), that is, a light-emitting device 3 is split into a normal element 31 and a peep-proof element 32. The peep-proof element 32 includes a first anode 321, a first light-emitting functional layer 322, and a first cathode 323, and the first anode 321, the first light-emitting functional layer 322, and the first cathode 323 are stacked in sequence away from the driving backplane 1; the normal element 31 includes a second anode 311, a second light-emitting functional layer 312, and a second cathode 313, and the second anode 311, the second light-emitting functional layer 312, and the second cathode 313 are stacked in sequence away from the driving backplane 1.

[0100] In some embodiments, the slope angle of the pixel defining layer 2 at the edge of the opening where the privacy protection element 32 is located ranges from 60° to 90°.

[0101] In some embodiments, the slope angle of the pixel defining layer 2 at the edge of the opening where the normal element 31 is located ranges from 20° to 30°.

[0102] In this embodiment, by making the slope angle of the pixel defining layer 2 at at least a partial edge of the opening where the anti-peeping element 32 is located greater than the slope angle of the pixel defining layer 2 at the edge of the opening where the normal element 31 is located, the pixel defining layer 2 with a large slope angle can block the light emitting from at least a partial edge area of ​​the lower side of the opening where the anti-peeping element 32 is located (for example, the cross-sectional shape of the opening perpendicular to the driving back plate 1 is an inverted trapezoid, and the lower side of the opening refers to the end of the opening close to the driving back plate 1), thereby reducing the area of ​​the light emitting area on the lower side of the opening of the anti-peeping element 32, and then limiting the viewing angle of the anti-peeping element 32 to a preset anti-peeping viewing angle range, and ultimately realizing anti-peeping display of the display panel in certain anti-peeping scenarios.

[0103] In some embodiments, the pixel defining layer 2 is made of a black light-absorbing material. For example, the pixel defining layer 2 is made of a black polyimide-based material. With this configuration, the pixel defining layer 2 with a large slope angle can absorb light emitted from at least a partial edge region of the opening where the privacy protection element 32 is located, thereby providing better shielding for light emitted from at least a partial edge region of the opening where the privacy protection element 32 is located.

[0104] In some embodiments, referring to FIG. 2 a and FIG. 2 b , a surface of the pixel defining layer 2 between adjacent normal elements 31 and anti-peeping elements 32 (for example, light-emitting devices 3 of the same color are divided into normal elements 31 and anti-peeping elements 32) on a side facing away from the driving backplane 1 is a curved surface g1, and the points on the curved surface g1 that are farthest from the driving backplane 1 are connected to form a line P1, and the orthographic projection of the line P1 on the driving backplane 1 is aligned with the first edge a on the lower side of the opening where the anti-peeping element 32 is located (for example, the cross-sectional shape of the opening perpendicular to the driving backplane 1 is an inverted trapezoid, and the lower side of the opening refers to the end of the opening close to the driving backplane 1). The distance s1 between the orthographic projections on the driving backplate 1 is smaller than the distance s2 between the orthographic projection of the line P1 on the driving backplate 1 and the orthographic projection of the second edge b on the driving backplate 1 at the lower side of the opening where the normal element 31 is located (for example, the cross-sectional shape of the opening perpendicular to the driving backplate 1 is an inverted trapezoid, and the lower side of the opening refers to the end of the opening close to the driving backplate 1); the orthographic projections of the first edge a and the second edge b on the driving backplate 1 are located between the orthographic projections of the normal element 31 and the anti-peep element 32 on the driving backplate 1, and the orthographic projections of the first edge a and the second edge b on the driving backplate 1 are adjacent.

[0105] In some embodiments, referring to FIG. 2B , the distance A between the point on the curved surface g1 that is farthest from the driving backplate 1 and the driving backplate 1 is calculated as follows: tanθ = A / D. tanθ1 = A / (DB). tanθ2 = A / [C-(DB)]. A = tanθ*D = tanθ1*(DB) = tanθ2*[C-(DB)].

[0106] Among them, B is the opening width along the arrangement direction L1 of the anti-peep element 32 and the normal element 31 at the lower side of the opening where the anti-peep element 32 is located (for example, the cross-sectional shape of the opening perpendicular to the driving back plate 1 is an inverted trapezoid, and the lower side of the opening refers to the end of the opening close to the driving back plate 1).

[0107] C is the maximum width of the pixel definition layer 2 located between adjacent privacy protection elements 32 and normal elements 31 along the arrangement direction L1 of the privacy protection elements 32 and normal elements 31 .

[0108] D is the sum of the distance between the orthographic projection of the point on the arc surface g1 farthest from the driving back plate 1 and the orthographic projection of the first edge a on the driving back plate 1 plus B along the arrangement direction L1 of the anti-peeping element 32 and the normal element 31.

[0109] In some embodiments, θ=90°−α / 2, where α is the viewing angle of the privacy protection element 32 .

[0110] θ1 is the slope angle of the pixel defining layer 2 at the edge of the opening where the privacy protection element 32 is located.

[0111] θ2 is the slope angle of the pixel defining layer 2 at the opening edge where the normal element 31 is located.

[0112] In some embodiments, assuming θ=45°, θ2=25°, and setting different values ​​of C and B, the obtained values ​​of A and D are shown in Table 1 below.

[0113] Table 1 (unit: micrometer)

[0114] In some embodiments, referring to Figures 2a and 2c, a surface of the pixel defining layer 2 on a side facing away from the driving backplane 1 between two adjacent privacy protection elements 32 is a curved surface g2, and the two adjacent privacy protection elements 32 are respectively a first privacy protection element 3201 and a second privacy protection element 3202; the points on the curved surface g2 farthest from the driving backplane 1 are connected to form a line P2, and a distance s3 between the orthographic projection of the line P2 on the driving backplane 1 and the orthographic projection of the first edge d below the opening where the first privacy protection element 3201 is located on the driving backplane 1 is equal to a distance s4 between the orthographic projection of the line P2 on the driving backplane 1 and the orthographic projection of the second edge e below the opening where the second privacy protection element 3202 is located on the driving backplane 1; the orthographic projections of the first edge d and the second edge e on the driving backplane 1 are located between the orthographic projections of the first privacy protection element 3201 and the second privacy protection element 3202 on the driving backplane 1, and the orthographic projections of the first edge d and the second edge e on the driving backplane 1 are adjacent.

[0115] In some embodiments, the distance A1 between the point on the arc surface g2 farthest from the driver backplate 1 and the driver backplate 1 is calculated as follows: tanθ3 = A1 / D1. tanθ4 = A1 / (D1-B1). tanθ5 = A1 / [C1-(D1-B1)]. A1 = tanθ3*D1 = tanθ4*(D1-B1) = tanθ5*[C1-(D1-B1)].

[0116] Among them, B1 is the opening width along the arrangement direction L2 of the first anti-peep element 3201 and the second anti-peep element 3202 at the lower side of the opening where the first anti-peep element 3201 is located (for example, the cross-sectional shape of the opening perpendicular to the driving back plate 1 is an inverted trapezoid, and the lower side of the opening refers to the end of the opening close to the driving back plate 1).

[0117] C1 is the maximum width of the pixel definition layer 2 located between the first privacy protection element 3201 and the second privacy protection element 3202 along the arrangement direction L2 of the first privacy protection element 3201 and the second privacy protection element 3202 .

[0118] D1 is the sum of the distance between the orthographic projection of the point on the arc surface g2 farthest from the driving back plate 1 on the driving back plate 1 and the orthographic projection of the first edge d on the driving back plate 1 plus B1 along the arrangement direction L2 of the first anti-peeping element 3201 and the second anti-peeping element 3202.

[0119] In some embodiments, θ3 = 90° - α / 2, where α is the visual angle of the first anti-peeping element 3201 .

[0120] θ4 is the slope angle of the pixel defining layer 2 at the opening edge where the first privacy protection element 3201 is located.

[0121] θ5 is the slope angle of the pixel defining layer 2 at the opening edge where the second privacy protection element 3202 is located.

[0122] In some embodiments, referring to Figures 2a and 2d, the surface of the pixel defining layer 2 between two adjacent normal elements 31 on the side facing away from the driving backplane 1 is a curved surface g3, and the two adjacent normal elements 31 are respectively a first normal element 3101 and a second normal element 3102; the points on the curved surface g3 farthest from the driving backplane 1 are connected to form a line P3, and the distance s5 between the orthographic projection of the line P3 on the driving backplane 1 and the orthographic projection of the first edge f on the lower side of the opening where the first normal element 3101 is located on the driving backplane 1 is equal to the distance s6 between the orthographic projection of the line P3 on the driving backplane 1 and the orthographic projection of the second edge h on the lower side of the opening where the second normal element 3102 is located on the driving backplane 1; the orthographic projections of the first edge f and the second edge h on the driving backplane 1 are located between the orthographic projections of the first normal element 3101 and the second normal element 3102 on the driving backplane 1, and the orthographic projections of the first edge f and the second edge h on the driving backplane 1 are adjacent.

[0123] In some embodiments, referring to FIG. 2D , the distance A2 between the point on the curved surface g3 farthest from the driving backplate 1 and the driving backplate 1 is calculated as follows: tanθ6 = A2 / D2. tanθ7 = A2 / (D2-B2). tanθ8 = A2 / [C2-(D2-B2)]. A2 = tanθ6*D2 = tanθ7*(D2-B2) = tanθ8*[C2-(D2-B2)].

[0124] Among them, B2 is the opening width along the arrangement direction L3 of the first normal element 3101 and the second normal element 3102 on the lower side of the opening where the first normal element 3101 is located (for example, the cross-sectional shape of the opening perpendicular to the driving backplane 1 is an inverted trapezoid, and the lower side of the opening refers to the end of the opening close to the driving backplane 1).

[0125] C2 is the maximum width of the pixel definition layer 2 located between the first normal element 3101 and the second normal element 3102 along the arrangement direction L3 of the first normal element 3101 and the second normal element 3102 .

[0126] D2 is the sum of the distance between the orthographic projection of the point on the arc surface g3 farthest from the driving backplane 1 and the orthographic projection of the first edge f on the driving backplane 1 plus B2 along the arrangement direction L3 of the first normal element 3101 and the second normal element 3102.

[0127] In some embodiments, θ6 = 90° - α1 / 2, where α1 is the viewing angle of the first normal element 3101 .

[0128] θ7 is the slope angle of the pixel defining layer 2 at the opening edge where the first normal element 3101 is located.

[0129] θ8 is the slope angle of the pixel defining layer 2 at the opening edge where the second normal element is located.

[0130] In some embodiments, α ranges from 40° to 50°. Preferably, α is 45°.

[0131] In some embodiments, α1 ranges from 120° to 160°. Preferably, α1 is 120°.

[0132] In some embodiments, referring to Figure 2a, the multiple light-emitting devices 3 include multiple red light-emitting devices 301, multiple green light-emitting devices 302 and multiple blue light-emitting devices 303, the red light-emitting device 301 includes a red anti-peeping element and a red normal element; the green light-emitting device 302 includes a green anti-peeping element and a green normal element; the blue light-emitting device 303 includes a blue anti-peeping element and a blue normal element; the slope angles of the opening edge pixel defining layer 2 where the red anti-peeping element, the green anti-peeping element and the blue anti-peeping element are located are the same; the slope angles of the opening edge pixel defining layer 2 where the red normal element, the green normal element and the blue normal element are located are the same.

[0133] In some embodiments, referring to FIG2a , the opening area where the blue privacy protection element is located is greater than the opening area where the green privacy protection element is located. The opening area where the blue normal element is located is greater than the opening area where the green normal element is located. The opening area where the red normal element is located is greater than the opening area where the red normal element is located.

[0134] In some embodiments, the slope angle of the pixel-defining layer at the edge of the opening where the green privacy protection element is located is greater than the slope angle of the pixel-defining layer at the edge of the opening where the red privacy protection element is located, and greater than the slope angle of the pixel-defining layer at the edge of the opening where the blue privacy protection element is located. Because the human eye is sensitive to green light, configuring the slope angles of the pixel-defining layers at the edge of the opening where the different colored privacy protection elements are located in this manner can achieve a better privacy protection display effect on the display panel.

[0135] In some embodiments, referring to 2a-2f, line P2 and line P3 are not on the same straight line, and the distance s3 between the orthographic projection of line P2 on the driving back plate 1 and the orthographic projection of the first edge d on the lower side of the opening where the first peep-proof element 3201 is located on the driving back plate 1 is greater than the distance s4 between the orthographic projection of line P2 on the driving back plate 1 and the orthographic projection of the second edge e on the lower side of the opening where the second peep-proof element 3202 is located on the driving back plate 1, and the orthographic projection of line P3 on the driving back plate 1 and the first edge f on the lower side of the opening where the first normal element 3101 is located on the driving back plate 1 is greater than the distance s6 between the orthographic projection of line P3 on the driving backplane 1 and the orthographic projection of the second edge h on the lower side of the opening where the second normal element 3102 is located on the driving backplane 1, and the distance s5 between the orthographic projection of line P3 on the driving backplane 1 and the orthographic projection of the first edge f on the lower side of the opening where the first normal element 3101 is located on the driving backplane 1 is greater than the distance s3 between the orthographic projection of line P2 on the driving backplane 1 and the orthographic projection of the first edge d on the lower side of the opening where the first anti-peeping element 3201 is located on the driving backplane 1. This design facilitates setting the slope angle of the pixel defining layer at the edge of the opening where the different colored anti-peeping elements are located, thereby achieving a better anti-peeping display effect of the display panel.

[0136] In some embodiments, referring to Figure 2f, another structural cross-sectional schematic diagram along the AA cutting line in Figure 2a is shown; wherein, the display panel also includes a first shading structure 4, located on the side of the pixel defining layer 2 facing away from the driving backplane 1; the orthographic projection of the first shading structure 4 on the driving backplane 1 is located at the edge of the orthographic projection of the opening where the peeping element 32 is located on the driving backplane 1, and the orthographic projection of the first shading structure 4 on the driving backplane 1 at least covers the orthographic projection of a line formed by connecting the points on the curved surface g1 (g2) farthest from the driving backplane 1 on the driving backplane 1.

[0137] In some embodiments, referring to FIG. 2f , the width W of the first light-shielding structure 4 along the arrangement direction L1 of the privacy shielding element 32 and the normal element 31 and the height H along the direction away from the driving backplane 1 are calculated as follows: tanθ = (A + H) / D ... Formula (1). tanθ2 = (A + H) / (CWx) ... Formula (2). tanθ1 = A / x ... Formula (3).

[0138] Wherein, A is the distance between the point on the arc surface g1 (g2) that is farthest from the driving back plate 1 and the driving back plate 1.

[0139] D is the sum of the distance between the orthographic projection of the point on the arc surface g1 (g2) farthest from the driving back plate 1 and the orthographic projection of the first edge a on the driving back plate 1 plus B along the arrangement direction L1 of the anti-peep element 32 and the normal element 31.

[0140] B is the opening width along the arrangement direction L1 of the anti-peeping element 32 and the normal element 31 at the lower side of the opening where the anti-peeping element 32 is located (for example, the cross-sectional shape of the opening perpendicular to the driving back plate 1 is an inverted trapezoid, and the lower side of the opening refers to the end of the opening close to the driving back plate 1).

[0141] C is the maximum width of the pixel definition layer 2 located between adjacent privacy protection elements 32 and normal elements 31 along the arrangement direction L1 of the privacy protection elements 32 and normal elements 31 .

[0142] x is the shortest distance between the orthographic projection of the first light-shielding structure 4 on the driving backplane 1 and the orthographic projection of the first edge a on the driving backplane 1 .

[0143] θ=90°−α / 2, where α is the viewing angle of the anti-peeping element 32 .

[0144] θ1 is the slope angle of the pixel defining layer 2 at the edge of the opening where the privacy protection element 32 is located.

[0145] θ2 is the slope angle of the pixel defining layer 2 at the opening edge where the normal element 31 is located.

[0146] The height H of the first light-shielding structure 4 can be calculated from formula (1). Formulas (2) and (3) deduce that: tanθ2 = (A + H) / [CW - (A / tanθ1)], and further deduce that: [CW - (A / tanθ1)]tanθ2 = D * tanθ. Given A, C, D, θ, θ1, and θ2, the width W of the first light-shielding structure 4 can be calculated.

[0147] In this embodiment, the setting of the first shading structure 4 can, on the basis of blocking the light emitted from the edge area of ​​the opening where the anti-peeping element 32 is located by the pixel defining layer 2 with a large slope angle, further block the light emitted from the edge area of ​​the opening where the anti-peeping element 32 is located that is emitted through the pixel defining layer 2 with a large slope angle, thereby further reducing the area of ​​the light emitting area of ​​the opening of the anti-peeping element 32, and further better limiting the viewing angle of the anti-peeping element 32 to a preset anti-peeping viewing angle range.

[0148] In some embodiments, referring to Figure 2g, another structural cross-sectional schematic diagram along the AA section line in Figure 2a; Figure 2h is another structural cross-sectional schematic diagram along the AA section line in Figure 2a; Figure 2i is another structural cross-sectional schematic diagram along the AA section line in Figure 2a; wherein, based on the display panel structure in Figure 2f, the display panel further includes an encapsulation layer 5 and a second shading structure 6, the encapsulation layer 5 is located on the side of the first shading structure 4 away from the driving backplane 1, and the encapsulation layer 5 is used to encapsulate the light-emitting device 3; the encapsulation layer 5 includes more than three sublayers, and the more than three sublayers are stacked in sequence away from the driving backplane 1, and the second shading structure 6 is located at least between some adjacent sublayers; the orthographic projection of the second shading structure 6 on the driving backplane 1 is located at the edge of the orthographic projection of the opening where the peeping element 32 is located on the driving backplane 1, and the orthographic projection of the second shading structure 6 on the driving backplane 1 at least partially overlaps with the orthographic projection of the first shading structure 4 on the driving backplane 1.

[0149] In some embodiments, referring to FIG. 2 g , the encapsulation layer 5 includes three sub-layers, namely, a first inorganic layer 51 , an organic layer 52 , and a second inorganic layer 53 stacked in sequence, and the second light shielding structure 6 is located between the first inorganic layer 51 and the organic layer 52 .

[0150] In some embodiments, the height of the second light-shielding structure 6 is less than the thickness of the organic layer 52, the width of the second light-shielding structure 6 along the arrangement direction L1 of the anti-peep element 32 and the normal element 31 is equal to the width of the first light-shielding structure 4, and the orthographic projection of the second light-shielding structure 6 on the driving backplane 1 is closer to the orthographic projection of the opening where the anti-peep element 32 is located on the driving backplane 1 relative to the orthographic projection of the first light-shielding structure 4 on the driving backplane 1.

[0151] In some embodiments, referring to Figure 2h, the encapsulation layer 5 includes four sub-layers, namely, a first inorganic layer 51, a first organic layer 521, a second organic layer 522 and a second inorganic layer 53 stacked in sequence, and a second light-shielding structure 6 is arranged between the first inorganic layer 51 and the first organic layer 521 and between the first organic layer 521 and the second organic layer 522.

[0152] In some embodiments, refer to Figure 2j, which is a top view schematic diagram of the arrangement of the first shading structure and the second shading structure in the embodiment of the present disclosure; wherein, the width of the second shading structure 6 along the arrangement direction L1 of the anti-peep element 32 and the normal element 31 is equal to the width of the first shading structure 4, the height of the second shading structure 6 located between the first inorganic layer 51 and the first organic layer 521 is less than the thickness of the first organic layer 521, the height of the second shading structure 6 located between the first organic layer 521 and the second organic layer 522 is less than the thickness of the second organic layer 522, and the orthographic projections of the second shading structure 6 located between the first organic layer 521 and the second organic layer 522, the second shading structure 6 located between the first inorganic layer 51 and the first organic layer 521, and the first shading structure 4 on the driving backplane 1 are successively away from the orthographic projection of the opening where the anti-peep element 32 is located on the driving backplane 1.

[0153] In some embodiments, referring to Figure 2i, the encapsulation layer 5 includes four sub-layers, namely, a first inorganic layer 51, an organic layer 52, a second inorganic layer 53 and a third inorganic layer 54 stacked in sequence, and a second light-shielding structure 6 is arranged between the first inorganic layer 51 and the organic layer 52 and between the second inorganic layer 53 and the third inorganic layer 54.

[0154] In some embodiments, the width of the second light-shielding structure 6 along the arrangement direction L1 of the anti-peep element 32 and the normal element 31 is equal to the width of the first light-shielding structure 4, the height of the second light-shielding structure 6 located between the first inorganic layer 51 and the organic layer 52 is less than the thickness of the organic layer 52, the height of the second light-shielding structure 6 located between the second inorganic layer 53 and the third inorganic layer 54 is less than the thickness of the third organic layer 54, and the orthographic projections of the second light-shielding structure 6 located between the second inorganic layer 53 and the third inorganic layer 54, the second light-shielding structure 6 located between the first inorganic layer 51 and the organic layer 52, and the first light-shielding structure 4 on the driving backplane 1 are successively away from the orthographic projection of the opening where the anti-peep element 32 is located on the driving backplane 1.

[0155] In this embodiment, the setting of the second shading structure 6 can further block the light emitting from the edge area of ​​the opening where the privacy protection element 32 is located, on the basis of the pixel defining layer 2 with a large slope angle and the first shading structure 4 blocking the light emitting from the edge area of ​​the opening where the privacy protection element 32 is located, thereby further reducing the light emitting area of ​​the opening of the privacy protection element 32, and further better limiting the viewing angle of the privacy protection element 32 to a preset privacy protection viewing angle range.

[0156] In some embodiments, the materials of the first light shielding structure 4 and the second light shielding structure 6 include black organic materials, such as black acrylic materials, black resin materials, etc.

[0157] In some embodiments, the optical density (OD) of the black material of the first light-shielding structure 4 and the second light-shielding structure 6 is higher than that of the black material of the pixel defining layer 2 .

[0158] The display panel provided by the embodiment of the present disclosure makes the slope angle of the pixel defining layer at at least the local edge of the opening where the privacy protection element is located greater than the slope angle of the pixel defining layer at the edge of the opening where the normal element is located. The pixel defining layer with a large slope angle can block the light emitting from at least the local edge area of ​​the opening where the privacy protection element is located, thereby reducing the light emitting area of ​​the opening of the privacy protection element, and further limiting the viewing angle of the privacy protection element to a preset privacy protection viewing angle range, ultimately realizing privacy protection display of the display panel in certain privacy protection scenarios.

[0159] Based on the above structure of the display panel, an embodiment of the present disclosure also provides a driving method for the display panel, which includes: when the display panel is displaying normally, driving the backplane to drive the normal elements and anti-peeping elements in the light-emitting device to emit light; when the display panel is displaying anti-peeping, driving the backplane to drive the anti-peeping elements in the light-emitting device to emit light.

[0160] Specifically, when the display panel displays normally (such as normal display is usually displayed within a viewing angle range of 120°), the pixel circuit in the driving backplane drives the normal elements and anti-peeping elements in the light-emitting device to emit light, thereby realizing normal display of the display panel; when the display panel displays anti-peeping (such as anti-peeping display is usually displayed within a viewing angle range of 45°), the pixel circuit in the driving backplane only drives the anti-peeping element in the light-emitting device to emit light, thereby realizing anti-peeping display of the display panel.

[0161] Based on the above structure of the display panel, an embodiment of the present disclosure further provides a method for preparing the display panel, including: Step S01: preparing a driving backplane.

[0162] Step S02: preparing anodes of multiple light-emitting devices on one side of the driving backplane. The preparation of the anodes of the light-emitting devices includes preparing the anodes of normal elements and the anodes of the anti-peeping elements through a single patterning process.

[0163] Step S03: A pixel definition layer and a plurality of openings are formed on the side of the anode facing away from the driver backplane. The slope angle of the pixel definition layer at at least a partial edge of the opening where the privacy protection element is located is greater than the slope angle of the pixel definition layer at the edge of the opening where the normal element is located.

[0164] Step S04: sequentially prepare the light-emitting functional layer and cathode of the light-emitting device. The light-emitting functional layer and cathode of the anti-peeping element and the normal element are prepared in different openings respectively.

[0165] In some embodiments, preparing a pixel defining layer and a plurality of openings in the pixel defining layer in step S03 includes: step S031 : forming a pixel defining layer film by coating on a side of the anode facing away from the driving backplane.

[0166] Step S032: forming a slope angle ∠2 of the pixel defining layer at the opening edge where the privacy protection element is located by exposure and development processes, and forming a step on the side of the pixel defining layer film 7 at the opening edge where the normal element is located away from the driving backplane.

[0167] In this step, referring to FIG3a , which is a schematic diagram of step S032 in a method for manufacturing a display panel according to an embodiment of the present disclosure, the pixel defining layer 7 can be directly exposed. Specifically, by setting different slit diffraction patterns, the pixel defining layer 7 at the edge of the opening where the privacy screen element is located is exposed 100%, while the pixel defining layer 7 at the edge of the opening where the normal element is located is exposed 50%. This reduces the exposure energy of the pixel defining layer 7 at the edge of the opening where the normal element is located. This results in a step formed at the edge of the opening where the normal element is located, away from the driver backplane, after exposure and development.

[0168] Step S033: drying the pixel definition layer film 7, and sending the display panel kept at the drying temperature into a hot box, and taking it out after keeping it in the hot box for a set time, so as to form a slope angle ∠1 of the pixel definition layer at the opening edge where the normal components are located.

[0169] In this step, refer to Figure 3b, which is a schematic diagram of step S033 in a method for preparing a display panel according to an embodiment of the present disclosure. By using a hot-in, cold-out hot box, the self-leveling properties of the pixel defining layer material are utilized to form a smaller slope angle ∠1 of the pixel defining layer at the edge of the opening where the normal components are located. Refer to Figure 3c, which is a comparison diagram of the parameters and effects of forming the slope angle of the pixel defining layer by using a hot-in, cold-out hot box in a method for preparing a display panel according to an embodiment of the present disclosure. As can be seen from Figure 3c, a display panel at 250°C is put into a hot box at a temperature of 250°C, kept for 60 minutes, and then taken out, which can form a slope angle of 40°.

[0170] In some embodiments, referring to FIG3d , which is a schematic diagram of another method for manufacturing a display panel according to an embodiment of the present disclosure, step S03 comprises preparing a pixel defining layer and a plurality of openings in the pixel defining layer, including: step S031 : forming a pixel defining layer film 7 on the side of the anode facing away from the driving backplane.

[0171] Step S032': forming an initial slope angle ∠2 of the pixel defining layer film 7 at the opening edge where the anti-peeping element is located and a slope angle ∠1 of the pixel defining layer at the opening edge where the normal element is located through an exposure and development process; wherein, the initial slope angle ∠2 of the pixel defining layer film at the opening edge where the anti-peeping element is located is equal to the slope angle ∠1 of the pixel defining layer at the opening edge where the normal element is located.

[0172] Step S033': etching the initial slope angle ∠2 through an etching process to form a slope angle ∠2' of the pixel defining layer at the edge of the opening where the privacy protection element is located.

[0173] In this step, a pattern of an organic mask layer or an inorganic mask layer can be formed on the side of the pixel defining layer film facing away from the driving backplane; the initial slope angle of the pixel defining layer film at the opening edge where the privacy protection element is located is exposed on the pattern of the organic mask layer or the inorganic mask layer, and the initial slope angle is etched through a dry etching process to form the slope angle of the pixel defining layer at the opening edge where the privacy protection element is located.

[0174] In some embodiments, during etching, the use of an inorganic mask layer has a higher etching selectivity than the use of an organic mask layer, and the pixel defining layer film of an inorganic mask layer + an organic material has a higher etching selectivity, which is more conducive to achieving a large slope angle in the pixel defining layer film. Experimental verification has found that the slope angle in the pixel defining layer film that can be achieved using an inorganic mask layer can reach 90°.

[0175] In step S033', during the dry etching process, a laser can be used to directly dry-etch the initial slope angle to form the slope angle of the pixel-defining layer at the edge of the opening where the privacy protection element is located. For example, the display substrate on which the pixel-defining layer is formed is positioned with the pixel-defining layer film facing downward, and the laser etching equipment is positioned below the display substrate. Laser etching is performed at the initial slope angle position by opening a hole in the inorganic mask layer, thereby achieving a 90° slope angle of the pixel-defining layer at the edge of the opening where the privacy protection element is located.

[0176] An embodiment of the present disclosure further provides a display device, comprising the display panel in any of the above embodiments.

[0177] By adopting the display panel in any of the above embodiments, not only can the normal display of the display device be achieved (i.e., display in a large viewing angle range, such as a large viewing angle range of 120° to 160°), but also the anti-peeping display of the display device can be achieved (i.e., display in an anti-peeping viewing angle range, such as an anti-peeping viewing angle range of 40° to 50°).

[0178] The display device provided in the embodiments of the present disclosure may be any product or component with a display function, such as an OLED panel, an OLED TV, an OLED billboard, a display, a mobile phone, or a navigation device.

[0179] It is understood that the above embodiments are merely exemplary embodiments for illustrating the principles of the present disclosure, and the present disclosure is not limited thereto. Those skilled in the art may make various modifications and improvements without departing from the spirit and substance of the present disclosure, and such modifications and improvements are also considered to be within the scope of protection of the present disclosure.

Claims

1. A display panel, wherein: It includes a driving backplane, a pixel defining layer and a plurality of light-emitting devices. The pixel definition layer is located on one side of the driving backplane, and a plurality of openings are formed in the pixel definition layer; The light emitting device comprises a normal element and at least one anti-peeping element, wherein the anti-peeping element and the normal element are respectively located in different openings; The slope angle of the pixel defining layer at at least a partial edge of the opening where the privacy protection element is located is greater than the slope angle of the pixel defining layer at the edge of the opening where the normal element is located.

2. The display panel according to claim 1, wherein: The slope angle of the pixel defining layer at the opening edge where the peep-proof element is located is in the range of 60° to 90°; The slope angle of the pixel defining layer at the opening edge where the normal element is located ranges from 20° to 30°.

3. The display panel according to claim 1, wherein: The pixel defining layer is made of black light absorbing material.

4. The display panel according to claim 1, wherein: The surface of the pixel defining layer between the adjacent normal element and the anti-peeping element, which is away from the driving backplane, is a curved surface. The points on the arc surface farthest from the driving back plate are connected to form a line, and the distance between the orthographic projection of the line on the driving back plate and the orthographic projection of the first edge of the opening where the peek-proof element is located on the driving back plate is smaller than the distance between the orthographic projection of the line on the driving back plate and the orthographic projection of the second edge of the opening where the normal element is located on the driving back plate; The orthographic projections of the first edge and the second edge on the driving backplane are located between the orthographic projections of the normal element and the anti-peeping element on the driving backplane, and the orthographic projections of the first edge and the second edge on the driving backplane are adjacent.

5. The display panel according to claim 4, wherein: The calculation formula of the distance A between the point on the arc surface farthest from the driving back plate and the driving back plate is: tanθ=A / D; tanθ1=A / (DB); tanθ2=A / [C-(DB)]; A=tanθ*D=tanθ1*(DB)=tanθ2*[C-(DB)]; Wherein, B is the opening width of the opening where the peep-proof element is located along the arrangement direction of the peep-proof element and the normal element; C is the maximum width of the pixel defining layer located between the adjacent privacy protection elements and the normal elements along the arrangement direction of the privacy protection elements and the normal elements; D is the sum of the distance between the orthographic projection of the point on the arc surface farthest from the driving backplane on the driving backplane and the orthographic projection of the first edge on the driving backplane plus B along the arrangement direction of the anti-peeping element and the normal element; θ=90°-α / 2; wherein α is the viewing angle of the anti-peeping element; θ1 is the slope angle of the pixel defining layer at the edge of the opening where the anti-peeping element is located; θ2 is the slope angle of the pixel defining layer at the opening edge where the normal element is located.

6. The display panel according to claim 1, wherein: The surface of the pixel defining layer between two adjacent anti-peeping elements, which is away from the driving backplane, is a curved surface. The two adjacent anti-peeping elements are respectively a first anti-peeping element and a second anti-peeping element; The points on the arc surface farthest from the driving back plate are connected to form a line, and the distance between the orthographic projection of the line on the driving back plate and the orthographic projection of the first edge of the opening where the first peep-proof element is located on the driving back plate is equal to the distance between the orthographic projection of the line on the driving back plate and the orthographic projection of the second edge of the opening where the second peep-proof element is located on the driving back plate; The orthographic projections of the first edge and the second edge on the driving backplane are located between the orthographic projections of the first anti-peeping element and the second anti-peeping element on the driving backplane, and the orthographic projections of the first edge and the second edge on the driving backplane are adjacent.

7. The display panel according to claim 6, wherein: The calculation formula of the distance A1 between the point on the arc surface farthest from the driving back plate and the driving back plate is: tanθ3=A1 / D1; tanθ4=A1 / (D1-B1); tanθ5=A1 / [C1-(D1-B1)]; A1=tanθ3*D1=tanθ4*(D1-B1)=tanθ5*[C1-(D1-B1)]; Wherein, B1 is the opening width of the opening where the first peep-proof element is located along the arrangement direction of the first peep-proof element and the second peep-proof element; C1 is the maximum width of the pixel definition layer located between the first anti-peeping element and the second anti-peeping element along the arrangement direction of the first anti-peeping element and the second anti-peeping element; D1 is the sum of the distance between the orthographic projection of the point on the arc surface farthest from the driving backplane on the driving backplane and the orthographic projection of the first edge on the driving backplane plus B1 along the arrangement direction of the first anti-peeping element and the second anti-peeping element; θ3=90°-α / 2; wherein α is the visual angle of the first anti-peeping element; θ4 is the slope angle of the pixel defining layer at the edge of the opening where the first anti-peeping element is located; θ5 is the slope angle of the pixel defining layer at the opening edge where the second privacy protection element is located.

8. The display panel according to claim 1, wherein: The surface of the pixel defining layer between two adjacent normal elements, which is away from the driving backplane, is a curved surface. The two adjacent normal elements are respectively a first normal element and a second normal element; The points on the arc surface farthest from the driving backplane are connected to form a line, and the distance between the orthographic projection of the line on the driving backplane and the orthographic projection of the first edge of the opening where the first normal element is located on the driving backplane is equal to the distance between the orthographic projection of the line on the driving backplane and the orthographic projection of the second edge of the opening where the second normal element is located on the driving backplane; The orthographic projections of the first edge and the second edge on the driving backplane are located between the orthographic projections of the first normal element and the second normal element on the driving backplane, and the orthographic projections of the first edge and the second edge on the driving backplane are adjacent.

9. The display panel according to claim 8, wherein: The calculation formula of the distance A2 between the point on the arc surface farthest from the driving back plate and the driving back plate is: tanθ6=A2 / D2; tanθ7=A2 / (D2-B2); tanθ8=A2 / [C2-(D2-B2)]; A2=tanθ6*D2=tanθ7*(D2-B2)=tanθ8*[C2-(D2-B2)]; Wherein, B2 is the opening width of the opening where the first normal element is located along the arrangement direction of the first normal element and the second normal element; C2 is the maximum width of the pixel definition layer located between the first normal element and the second normal element along the arrangement direction of the first normal element and the second normal element; D2 is the sum of the distance between the orthographic projection of the point on the arc surface farthest from the driving backplane on the driving backplane and the orthographic projection of the first edge on the driving backplane plus B2 along the arrangement direction of the first normal element and the second normal element; θ6=90°-α1 / 2; wherein α1 is the viewing angle of the first normal element; θ7 is the slope angle of the pixel defining layer at the opening edge where the first normal element is located; θ8 is the slope angle of the pixel defining layer of the opening where the second normal element is located.

10. The display panel according to claim 5 or 7, wherein: The range of α is 40° to 50°.

11. The display panel according to claim 9, wherein: The range of α1 is 120° to 160°.

12. The display panel according to claim 1, wherein: The plurality of light emitting devices include a plurality of red light emitting devices, a plurality of green light emitting devices and a plurality of blue light emitting devices, The red light emitting device includes a red anti-peeping element and a red normal element; The green light emitting device includes a green anti-peeping element and a green normal element; The blue light emitting device includes a blue anti-peeping element and a blue normal element; The slope angles of the pixel defining layers at the opening edges where the red privacy protection element, the green privacy protection element, and the blue privacy protection element are located are the same; The slope angles of the pixel defining layer at the opening edge where the red normal element, the green normal element, and the blue normal element are located are the same.

13. The display panel according to claim 4 or 6, wherein: It also includes a first light shielding structure located on a side of the pixel defining layer away from the driving backplane; The orthographic projection of the first shading structure on the driving back plate is located at the edge of the orthographic projection of the opening where the anti-peep element is located on the driving back plate, and the orthographic projection of the first shading structure on the driving back plate at least covers the orthographic projection of a line formed by connecting the points on the curved surface farthest from the driving back plate on the driving back plate.

14. The display panel according to claim 13, wherein: It also includes an encapsulation layer and a second light shielding structure, The encapsulation layer is located on a side of the first light-shielding structure away from the driving backplane, and the encapsulation layer is used to encapsulate the light-emitting device; The encapsulation layer includes more than three sub-layers, and the more than three sub-layers are stacked in sequence away from the driving backplane. The second light shielding structure is at least located between some of the adjacent sub-layers; The orthographic projection of the second light-shielding structure on the driving backplane is located at the orthographic projection edge of the opening where the privacy protection element is located on the driving backplane, and the orthographic projection of the second light-shielding structure on the driving backplane at least partially overlaps with the orthographic projection of the first light-shielding structure on the driving backplane.

15. The display panel according to claim 13, wherein: The calculation formulas of the width W of the first light shielding structure along the arrangement direction of the anti-peeping element and the normal element and the height H along the direction away from the driving backplane are: tanθ=(A+H) / D; tanθ2=(A+H) / (CWx); tanθ1=A / x; Wherein, A is the distance between the point on the arc surface farthest from the driving backplane and the driving backplane; D is the sum of the distance between the orthographic projection of the point on the arc surface farthest from the driving backplane on the driving backplane and the orthographic projection of the first edge on the driving backplane plus B along the arrangement direction of the anti-peeping element and the normal element; B is the opening width of the opening where the privacy protection element is located along the arrangement direction of the privacy protection element and the normal elements; C is the maximum width of the pixel defining layer located between the adjacent privacy protection elements and the normal elements along the arrangement direction of the privacy protection elements and the normal elements; x is the shortest distance between the orthographic projection of the first light shielding structure on the driving backplane and the orthographic projection of the first edge on the driving backplane; θ=90°-α / 2; wherein α is the viewing angle of the anti-peeping element; θ1 is the slope angle of the pixel defining layer at the edge of the opening where the anti-peeping element is located; θ2 is the slope angle of the pixel defining layer at the opening edge where the normal element is located.

16. The display panel according to claim 14, wherein: The materials of the first light shielding structure and the second light shielding structure include black organic material.

17. A method for preparing a display panel, wherein: include: preparing a drive backplane; Preparing anodes of a plurality of light-emitting devices on one side of the driving backplane; Preparing the anode of the light-emitting device includes preparing the anode of the normal element and the anode of the anti-peeping element through a single patterning process; Preparing a pixel definition layer and a plurality of openings in the pixel definition layer on a side of the anode away from the driving backplane; The slope angle of the pixel defining layer at at least a partial edge of the opening where the privacy protection element is located is greater than the slope angle of the pixel defining layer at the edge of the opening where the normal element is located.

18. A display device, wherein: A display panel comprising any one of claims 1-16.

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