Display panel, preparation method thereof and display device

Abstract

The invention provides a display panel, a preparation method thereof and a display device. The problem that in the prior art, a display device is low in display brightness or high in power consumption is solved. The display panel includes: a substrate; the pixel defining layer is located on one side of the substrate, and at least one pixel opening is defined by the pixel defining layer; at least part of the light extraction structure is located in the pixel opening, the light extraction structure comprises a plurality of concave parts, the ends, close to the substrate, of at least part of the concave parts are located on the same straight line, and the included angle between the straight line and the plane where the substrate is located is larger than 0 degree and smaller than or equal to 45 degrees; the light-emitting device is located in the pixel opening and located on the side, away from the substrate, of the light extraction structure. The light extraction structure comprises a plurality of concave parts, and when the light-emitting devices are manufactured on the surfaces, away from the substrate, of the concave parts, the light-emitting area of the light-emitting devices can be increased, the advancing direction of light emitted by the light-emitting devices can be changed, and the light emitted by the light-emitting devices is not prone to being captured and can be emitted out more easily.

Description

Technical Field

[0001] The present application relates to the field of display technology, and in particular to a display panel and a method for preparing the same, and a display device. Background Art

[0002] The market share of display devices, such as organic electroluminescence display (OLED) display devices, is gradually expanding, and new demands such as high brightness and low power consumption are becoming more and more urgent. However, a considerable portion of the light emitted from the OLED light-emitting functional layer of the display device will be captured or confined inside the screen body and will not be emitted to the outside of the screen body, resulting in low display brightness and high power consumption of the display device. Summary of the invention

[0003] In view of this, the embodiments of the present application provide a display panel and a method for manufacturing the same, and a display device, which solve the problem of low display brightness or high power consumption of the display device in the prior art.

[0004] In a first aspect, the present application provides a display panel, comprising:

[0005] substrate;

[0006] A pixel defining layer is located on one side of the substrate, and the pixel defining layer surrounds and forms at least one pixel opening;

[0007] A light extraction structure, at least partly located in the pixel opening, the light extraction structure comprising a plurality of recessed portions, at least some of the recessed portions having ends close to the substrate located on the same straight line, and an angle between the straight line and the plane where the substrate is located is greater than 0° and less than or equal to 45°;

[0008] The light emitting device is located in the pixel opening and on the side of the light extraction structure facing away from the substrate.

[0009] In one embodiment, along the direction parallel to the centroid of the orthographic projection of the pixel opening on the substrate pointing to the orthographic projection of the pixel defining layer on the substrate, at least some of the multiple recessed portions arranged in sequence have ends close to the substrate located on the same straight line, or at least some of the ends close to the substrate are tangent to the same straight line;

[0010] Preferably, the plurality of recessed portions are centrally symmetrical;

[0011] Preferably, along a direction perpendicular to the substrate, a line connecting the symmetry centers of the plurality of recessed portions and the centroid of the orthographic projection of the pixel opening on the substrate is perpendicular to the plane where the substrate is located.

[0012] In one embodiment, along a direction parallel to the centroid of the orthographic projection of the pixel opening on the substrate pointing to the orthographic projection of the pixel defining layer on the substrate, ends of the sequentially arranged recessed portions close to the substrate are all located on the same straight line.

[0013] In one embodiment, along the direction of the orthographic projection of the pixel defining layer on the substrate parallel to the centroid of the orthographic projection of the pixel opening on the substrate, a plurality of recessed portions arranged in sequence are divided into a first recessed group and a second recessed group, and the second recessed group is located on a side of the first recessed group close to the pixel defining layer; an end of the plurality of recessed portions in the second recessed group close to the substrate is located on the same straight line, and a line connecting an end of the plurality of recessed portions in the first recessed group close to the substrate is parallel to the substrate.

[0014] In one embodiment, along a direction parallel to the centroid of the orthographic projection of the pixel opening on the substrate pointing to the orthographic projection of the pixel defining layer on the substrate, the plurality of recessed portions arranged in sequence are divided into a plurality of recessed groups, the plurality of recessed groups include a plurality of third recessed groups, and the plurality of third recessed groups are distributed in steps;

[0015] The ends of the multiple recessed portions in the same third recessed group close to the substrate are located on the same straight line; and / or,

[0016] The ends of the multiple recessed portions in different third recessed groups close to the substrate are located on the same straight line;

[0017] Preferably, the plurality of recess groups further include a first recess group, the orthographic projection of the first recess group on the substrate is located on a side of the orthographic projection of the third recess group on the substrate close to the centroid of the orthographic projection of the pixel opening on the substrate; a line connecting one end of the plurality of recesses in the first recess group close to the substrate is parallel to the substrate;

[0018] Preferably, ends of multiple recessed portions in different third recessed groups close to the substrate are located on the same straight line, and / or a line connecting ends of multiple recessed portions in the same third recessed group close to the substrate is parallel to the substrate.

[0019] In one embodiment, the distance between adjacent recessed portions close to one end of the substrate is greater than or equal to 0.5 micrometers and less than or equal to 10 micrometers;

[0020] Preferably, along a direction perpendicular to the straight line, a distance between an end of the recessed portion away from the substrate and an end of the recessed portion close to the substrate is greater than or equal to 0.5 micrometers and less than or equal to 5 micrometers.

[0021] In one embodiment, the invention further comprises: a planar layer located on a side of the pixel defining layer close to the substrate, and a light extraction structure located on a surface of the planar layer away from the substrate;

[0022] Preferably, there is a convex portion between adjacent concave portions, and the boundary of the pixel defining layer is located at an end of the convex portion closest to the pixel defining layer facing away from the substrate;

[0023] Preferably, the shape of the light emitting device is arranged corresponding to the shape of the light extraction structure;

[0024] Preferably, the light-emitting device comprises a first electrode layer, a light-emitting functional layer, and a second electrode layer which are stacked in sequence, the first electrode layer is located on a side of the light-emitting functional layer close to the light extraction structure, a portion of the first electrode layer is exposed to the pixel opening, and the reflectivity of the second electrode layer is 15% to 40%;

[0025] Preferably, the second electrode layer comprises a magnesium-silver alloy;

[0026] Preferably, the orthographic projection of the pixel opening on the substrate is located within the orthographic projection range of the light extraction structure on the substrate;

[0027] Preferably, in a direction parallel to the substrate pointing toward the pixel defining layer, the spacing between the side walls of the pixel opening gradually increases;

[0028] Preferably, along a cross section perpendicular to the plane where the substrate is located, the cross-sectional shape of the side wall of the pixel opening includes an arc line or a straight line.

[0029] A second aspect of the present application provides a method for preparing a display panel, comprising:

[0030] providing a substrate;

[0031] A light extraction structure is prepared on one side of the substrate, wherein the light extraction structure includes a plurality of recessed portions, at least some of the recessed portions are located on the same straight line at one end close to the substrate, and an angle between the straight line and the plane where the substrate is located is greater than 0° and less than or equal to 45°;

[0032] A first electrode layer is prepared on a side of the light extraction structure facing away from the substrate, wherein an orthographic projection of the first electrode layer on the substrate at least partially overlaps with an orthographic projection of the light extraction structure on the substrate;

[0033] A pixel defining layer is formed on a side of the first electrode layer away from the substrate, wherein the pixel defining layer surrounds at least one pixel opening, and a portion of the first electrode layer is exposed to the pixel opening;

[0034] A light-emitting functional layer and a second electrode layer are sequentially prepared in the pixel opening to obtain a light-emitting device and a display panel.

[0035] In one embodiment, preparing a light extraction structure on one side of a substrate includes:

[0036] preparing a flat layer on one side of the substrate;

[0037] Prepare a light extraction structure on a surface of the flat layer away from the substrate;

[0038] Preferably, preparing the light extraction structure on the surface of the flat layer away from the substrate comprises: preparing the light extraction structure on the surface of the flat layer away from the substrate by photolithography.

[0039] A third aspect of the present application provides a display device, comprising the aforementioned display panel, or comprising a display panel prepared by the aforementioned preparation method.

[0040] In the display panel of the embodiment of the present application, the light extraction structure includes a plurality of recessed portions. When the light-emitting device is made on the surface of the recessed portion away from the substrate, it is beneficial to increase the light-emitting area of ​​the light-emitting device and can also change the traveling direction of the light emitted by the light-emitting device, so that the light emitted by the light-emitting device is not easily captured and is easier to emit, thereby improving the light extraction efficiency of the display panel, so that the display panel has higher brightness and lower power consumption; in addition, at least one end of the recessed portions close to the substrate is located on the same straight line, and the angle between the straight line and the plane where the substrate is located is greater than 0° and less than or equal to 45°. The angle between the straight line and the plane where the substrate is located can be adjusted to control the light emission direction of the display panel, thereby improving the light extraction efficiency of the display panel at a specific angle, meeting different product requirements, and having a wide range of applicable scenarios. BRIEF DESCRIPTION OF THE DRAWINGS

[0041] Figure 1 It is a schematic diagram of the cross-sectional structure of a display panel in one embodiment of the present application.

[0042] Figure 2 This is a schematic diagram of the cross-sectional structure of a display panel in another embodiment of the present application.

[0043] Figure 3 This is a schematic diagram of the cross-sectional structure of a display panel in another embodiment of the present application.

[0044] Figure 4 This is a schematic diagram of the cross-sectional structure of a display panel in another embodiment of the present application.

[0045] Figure 5 This is an enlarged structural schematic diagram of a light extraction structure in one embodiment of the present application.

[0046] Figure 6 This is an enlarged structural schematic diagram of a light extraction structure in another embodiment of the present application.

[0047] Figure 7 This is a schematic diagram of the cross-sectional structure of a display panel in another embodiment of the present application.

[0048] Figure 8 This is a schematic diagram of the cross-sectional structure of a display panel in another embodiment of the present application.

[0049] Fig. 9This is a schematic diagram of the cross-sectional structure of a display panel in another embodiment of the present application.

[0050] Fig.10 This is a schematic diagram of the cross-sectional structure of a display panel in another embodiment of the present application.

[0051] Fig.11 This is a schematic diagram of the cross-sectional structure of a display panel in another embodiment of the present application.

[0052] Fig.12 The figure is a schematic flow chart of a method for preparing a display panel in one embodiment of the present application. DETAILED DESCRIPTION

[0053] The following will be combined with the drawings in the embodiments of the present application to clearly and completely describe the technical solutions in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of this application.

[0054] In addition, in order to better illustrate the present application, numerous specific details are given in the following specific embodiments. It should be understood by those skilled in the art that the present application can also be implemented without certain specific details. In some examples, methods and means well known to those skilled in the art are not described in detail in order to highlight the subject matter of the present application.

[0055] It should be noted that similar reference numerals and letters denote similar items in the following drawings, and therefore, once an item is defined in one drawing, further definition and explanation thereof is not required in subsequent drawings.

[0056] In addition, the terms “first”, “second”, etc., if used, are merely used to distinguish between the descriptions and should not be understood as indicating or implying relative importance.

[0057] The present application provides a display panel according to a first aspect. Figure 1 and Figure 2The structural schematic diagram of the display panel shown in the figure comprises: a substrate 100; a pixel defining layer 200, which is located on one side of the substrate 100 and surrounds at least one pixel opening 210; a light extraction structure 300, which is at least partially located in the pixel opening 210 and comprises a plurality of recessed portions 310, wherein at least one end of the recessed portions 310 close to the substrate 100 is located on the same straight line 320, and an angle α between the straight line 320 and the plane where the substrate 100 is located is greater than 0° and less than or equal to 45°, and may be, for example, 1°, 5°, 10°, 15°, 20°, 25°, 30°, 35°, 40° or 45°, etc.; a light emitting device 400, which is at least partially located in the pixel opening 210 and is located on the side of the light extraction structure 300 facing away from the substrate 100.

[0058] In the display panel of the embodiment of the present application, the light extraction structure 300 includes a plurality of recessed portions 310. When the light-emitting device 400 is made on the surface of the recessed portion 310 away from the substrate 100, it is beneficial to increase the light-emitting area of ​​the light-emitting device 400, increase the probability of exciton recombination in the light-emitting device 400, and improve the light-emitting efficiency; the light extraction structure 300 can also change the direction of travel of the light emitted by the light-emitting device 400, so that the light emitted by the light-emitting device 400 is not easily captured and is easier to emit, thereby improving the light extraction efficiency of the display panel, so that the display panel has higher brightness and lower power consumption; in addition, at least part of the recessed portions 310 are located on the same straight line at one end close to the substrate 100, and the angle between the straight line and the plane where the substrate 100 is located is greater than 0° and less than or equal to 45°. The angle between the straight line and the plane where the substrate 100 is located can be adjusted to improve the light extraction efficiency of the display panel at a specific angle, meet different product requirements, and have a wide range of applicable scenarios.

[0059] For example, the light emitted by the display panel is as follows: Figure 1 As shown in the middle light paths A1, A2, A3, A4, A5, and A6, the light is more concentrated and the light output rate is higher.

[0060] In one embodiment, referring to Figure 3 In the structural diagram of the display panel shown in FIG. 1 , the shape of the light emitting device 400 corresponds to the shape of the light extraction structure 300. The light emitting device 400 has a concave portion corresponding to the light extraction structure 300, and the light emitting area of ​​the light emitting device 400 is larger; compared with the structure in which the light emitting device 400 is parallel to the substrate 100 as a whole, the light emitting device 400 in the display panel of the present application has a more complex path of light, and more light will not be captured by other film layers in the display panel and emitted (see FIG. 1 for details). Figure 3 The light irradiated to the pixel defining layer 200 will be reflected to the pixel opening 210 and then emitted (see Figure 3Moreover, due to the presence of the recessed portion 310, the light can be emitted in a direction parallel to the substrate 100 (refer to Figure 3 The light is then reflected and emitted, further increasing the emission probability of the light; improving the light emission efficiency of the display panel, and the brightness of the display panel is higher and the power consumption is lower.

[0061] In one embodiment, referring to Figure 3 In the structural schematic diagram of the display panel shown in the figure, the light emitting device 400 includes a first electrode layer 410, a light emitting functional layer 420, and a second electrode layer 430 which are stacked in sequence. The first electrode layer 410 is located on the side of the light emitting functional layer 420 close to the light extraction structure 300. The first electrode layer 410 is partially exposed to the pixel opening 210. The reflectivity of the second electrode layer 430 is 15% to 40%, for example, it can be 15%, 20%, 25%, 30%, 35% or 40%. Therefore, after the light emitted by the light emitting functional layer 420 passes through the second electrode layer 430, the adjacent or non-adjacent recessed portions will reflect the light, reduce lateral light leakage or light absorption, and increase the probability of light emission.

[0062] For example, refer to Fig. 9 In the structural schematic diagram of the display panel shown, a portion of the first electrode layer 410 is exposed to the pixel opening 210 , and the remaining portion is located between the pixel defining layer 200 and the substrate 100 .

[0063] For example, refer to Figure 3 The first electrode layer 410 is located between the pixel defining layer 200 and the substrate 100, and a portion of the first electrode layer 410 is exposed in the pixel opening 210. The orthographic projection of the light-emitting functional layer 420 on the substrate 100 covers a portion of the orthographic projection of the pixel defining layer 200 on the substrate 100, and the orthographic projection of the second electrode layer 430 on the substrate 100 covers the orthographic projection of the light-emitting functional layer 420 on the substrate 100.

[0064] Exemplarily, the display panel is a top-emitting OLED display panel, and the material of the second electrode layer 430 includes a magnesium-silver alloy, which is a semi-transmissive and semi-reflective electrode layer that can reflect light and transmit light. The materials of the first electrode layer 410 and the light-emitting functional layer 420 are the materials of the first electrode layer 410 and the light-emitting functional layer 420 in a conventional display panel, which are not considered as improvements of the present application and will not be described in detail herein.

[0065] Exemplarily, the first electrode layer 410 includes metal and has a high reflectivity. The light extraction structure 300 can reduce the specular reflection component on the surface of the first electrode layer 410, so that the reflection of the first electrode layer 410 is similar to diffuse reflection, and the specular reflectivity of the first electrode layer 410 is reduced, thereby improving the contrast and visibility of the display panel in the use environment. Exemplarily, the first electrode layer 410 includes a first electrode sublayer, a second electrode sublayer, and a third electrode sublayer stacked in sequence, the first electrode sublayer and the third electrode sublayer include indium tin oxide (ITO), and the second electrode sublayer includes silver.

[0066] Exemplarily, the light emitting device may be a top-emitting red, green, blue or white light device, and may be a single-layer, double-layer or multi-layer structure, which is not limited here.

[0067] In one embodiment, referring to Figure 1 , along the direction of the orthographic projection of the pixel defining layer 200 on the substrate 100 that is parallel to the centroid of the orthographic projection of the pixel opening 210 on the substrate 100, at least some of the multiple recessed portions 310 arranged in sequence have ends close to the substrate 100 located on the same straight line 320, or at least some of the recessed portions 310 have ends close to the substrate 100 that are tangent to the same straight line 320.

[0068] It can be understood that, along the direction parallel to the centroid of the orthographic projection of the pixel opening 210 on the substrate 100 pointing to the orthographic projection of the pixel defining layer 200 on the substrate 100, the straight line 320 can extend in a direction away from the substrate 100 (see specifically Figure 1 ), or may extend toward the direction close to the substrate 100 (see Figure 2 ). The angle α between the straight line 320 and the plane where the substrate 100 is located can be the angle between the straight line 320 extending in the direction away from the substrate 100 and the plane where the substrate 100 is located, or can be the angle between the straight line 320 extending in the direction close to the substrate 100 and the plane where the substrate 100 is located. Exemplarily, the recessed portion 310 is corrugated, and the tangent line of the end of the recessed portion 310 close to the substrate 100 is parallel to the straight line 320 (refer to Figure 1 or Figure 2 ). Exemplarily, along a direction perpendicular to the plane where the substrate 100 is located, an end of the recessed portion 310 close to the substrate 100 is a position where the distance between any point in the recessed portion 310 and the substrate 100 is the shortest.

[0069] In one embodiment, the plurality of recessed portions 310 are centrally symmetrical, so that the structure of the recessed portion 310 is easy to prepare and the manufacturing difficulty is reduced.

[0070] In one embodiment, along the direction perpendicular to the substrate 100, the line connecting the symmetry centers of the plurality of recesses 310 and the centroid of the orthographic projection of the pixel opening 210 on the substrate 100 is perpendicular to the plane where the substrate 100 is located. Thus, the structure of the recesses 310 is easy to prepare, reducing the difficulty of manufacturing.

[0071] In one embodiment, referring to Figure 1 and Figure 2 As shown in the structural schematic diagram of the display panel, along the direction of the orthographic projection of the pixel defining layer 200 on the substrate 100 parallel to the centroid of the orthographic projection of the pixel opening 210 on the substrate 100, the ends of the sequentially arranged recessed portions 310 close to the substrate 100 are all located on the same straight line 320.

[0072] For example, refer to Figure 1 , along the direction of the orthographic projection of the pixel defining layer 200 on the substrate 100, which is parallel to the centroid of the orthographic projection of the pixel opening 210 on the substrate 100, the line connecting the ends of the sequentially arranged recessed portions 310 close to the substrate 100 extends in a direction away from the substrate 100. At this time, the display panel can realize an anti-peeping function. For example, the display panel can be applied to application scenarios such as computers or mobile phones, and the required viewing angle range is small. The angle between the line connecting the ends of the recessed portions 310 close to the substrate 100 and the plane where the substrate 100 is located is greater than or equal to 30° and less than or equal to 45°; if the display panel is applied to a television, the angle α between the line connecting the ends of the recessed portions 310 close to the substrate 100 and the plane where the substrate 100 is located is greater than 0° and less than or equal to 5°.

[0073] For example, refer to Figure 2 , the multiple recessed portions 310 are divided into two parts, the two recessed portions 310 are axially symmetrical, and the line connecting one end of the recessed portion 310 close to the substrate 100 extends away from the substrate 100 along the centroid of the orthographic projection of the pixel opening 210 on the substrate 100, and the line connecting one end of the recessed portion 310 close to the substrate 100 extends towards the direction close to the substrate 100. At this time, the display panel can be applied to the vehicle-mounted central control screen, and the angle α between the line connecting one end of the recessed portion 310 close to the substrate 100 and the plane where the substrate 100 is located is greater than or equal to 10° and less than or equal to 45°. The angles between the lines connecting one end of the recessed portion 310 close to the substrate 100 on both sides of the symmetry axis and the plane where the substrate 100 is located can be equal or unequal.

[0074] For example, refer to Figure 1, a plurality of recessed portions 310 are divided into two parts, and the two parts of the recessed portions 310 are axially symmetrical. In the direction perpendicular to the substrate 100, the centroid of the orthographic projection of the pixel opening 210 on the substrate 100 is located on the straight line where the symmetry axis is located, and the symmetry axis is perpendicular to the plane where the substrate 100 is located. Along the direction parallel to the centroid of the orthographic projection of the pixel opening 210 on the substrate 100 pointing to the orthographic projection of the pixel defining layer 200 on the substrate 100, the line connecting the ends of the recessed portions 310 close to the substrate 100 extends in a direction away from the substrate 100, and the angles between the lines connecting the ends of the recessed portions 310 close to the substrate 100 on both sides of the symmetry axis and the plane where the substrate is located may be equal or unequal.

[0075] In one embodiment, referring to Figure 4 In the structural schematic diagram of the display panel shown, along the direction of the orthographic projection of the pixel opening 210 on the substrate 100 pointing to the orthographic projection of the pixel defining layer 200 on the substrate 100, the multiple recessed portions 310 arranged in sequence are divided into a first recessed group 311 and a second recessed group 312, and the second recessed group 312 is located on the side of the first recessed group 311 close to the pixel defining layer 200; the ends of the multiple recessed portions 310 in the second recessed group 312 close to the substrate 100 are located on the same straight line 320, and the connecting line of the ends of the multiple recessed portions 310 in the first recessed group 311 close to the substrate 100 is parallel to the substrate 100. In this way, the light emitting direction can be more finely controlled, so that the display effect of the display panel is more excellent.

[0076] It can be understood that the orthographic projection of the second recess group 312 on the substrate 100 surrounds the orthographic projection of the first recess group 311 on the substrate 100 .

[0077] In one embodiment, referring to Figure 5 In the structural schematic diagram of the display panel shown in FIG. 1 , along the direction of the orthographic projection of the pixel definition layer 200 on the substrate 100 parallel to the centroid of the orthographic projection of the pixel opening 210 on the substrate 100, the plurality of recessed portions 310 arranged in sequence are divided into a plurality of recessed groups 313, the plurality of recessed groups 313 include a plurality of third recessed groups 314, and the plurality of third recessed groups 314 are distributed in steps; the plurality of recessed portions 310 in the same third recessed group 314 are located on the same straight line 320 at one end close to the substrate 100. In another embodiment, referring to FIG. Figure 6In the structural schematic diagram of the display panel shown in the figure, along the direction of the orthographic projection of the pixel definition layer 200 on the substrate 100 parallel to the centroid of the orthographic projection of the pixel opening 210 on the substrate 100, the multiple recessed portions 310 arranged in sequence are divided into multiple recessed groups 313, and the multiple recessed groups 313 include multiple third recessed groups 314, and the multiple third recessed groups 314 are distributed in steps; the multiple recessed portions 310 in different third recessed groups 314 are located on the same straight line 320 at one end close to the substrate 100. Therefore, the setting of multiple recessed groups can control the light emission direction more precisely. It should be noted that Figure 5 and Figure 6 In the figure, the plurality of recess groups 313 are separated by dotted lines, which are not structures in the display panel and should not be construed as limitations on the present application.

[0078] In one embodiment, referring to Figure 6 , the ends of the multiple recessed portions 310 in different third recessed groups 314 close to the substrate 100 are located on the same straight line 320 , and the line connecting the ends of the multiple recessed portions 310 in the same third recessed group 314 close to the substrate 100 is parallel to the substrate 100 .

[0079] In one embodiment, referring to Figure 6 In the structural schematic diagram of the display panel shown in FIG. 1 , the plurality of recess groups 313 further include a first recess group 311, the orthographic projection of the first recess group 311 on the substrate 100 is located on the side of the centroid of the orthographic projection of the third recess group 314 on the substrate 100 close to the orthographic projection of the pixel opening 210 on the substrate 100; the connecting line of the ends of the plurality of recessed portions 310 in the first recess group 311 close to the substrate 100 is parallel to the substrate 100. Thus, the light emitting direction can be controlled more precisely.

[0080] Exemplarily, the light extraction structure includes a plurality of recess groups, a line connecting one end of the recesses in the same recess group close to the substrate is parallel to the substrate, and a plurality of recesses in different recess groups are located on the same straight line close to one end of the substrate, and the angle between the straight line and the plane where the substrate is located is greater than 0° and less than or equal to 45°. Exemplarily, the light extraction structure includes a plurality of recess groups, a line connecting one end of the recesses in the same recess group close to the substrate is located on the same straight line, and the angle between the straight line and the plane where the substrate is located is greater than 0° and less than or equal to 45°. Exemplarily, the light extraction structure includes a plurality of recess groups, a part of the recess groups have recesses located on the same straight line close to one end of the substrate, and the angle between the straight line and the plane where the substrate is located is greater than 0° and less than or equal to 45°, and a line connecting one end of the recesses in another part of the recess groups close to the substrate is parallel to the substrate.

[0081] In one embodiment, the distance between the ends of adjacent recessed portions 310 close to the substrate 100 is greater than or equal to 0.5 micrometers and less than or equal to 10 micrometers, for example, it can be 0.5 micrometers, 1 micrometer, 3 micrometers, 5 micrometers, 7 micrometers, 9 micrometers or 10 micrometers, etc., and along the direction perpendicular to the straight line, the distance between the end of the recessed portion 310 away from the substrate 100 and the end of the recessed portion 310 close to the substrate 100 is greater than or equal to 0.5 micrometers and less than or equal to 5 micrometers, for example, it can be 0.5 micrometers, 1 micrometer, 2 micrometers, 3 micrometers, 4 micrometers or 5 micrometers, etc. Therefore, the size of the recessed portion 310 is appropriate, the effect of increasing the light emitting area is excellent, and the effect of changing the direction of light travel is excellent.

[0082] In one embodiment, referring to Figure 7 The structural diagram of the display panel shown in the figure further includes: a flat layer 500, which is located on the side of the pixel defining layer 200 close to the substrate 100, and a light extraction structure 300 is located on the surface of the flat layer 500 away from the substrate 100. Exemplarily, the light extraction structure 300 is made on the surface of the flat layer 500, and specifically, a mask plate can be used in conjunction with a photolithography process to perform photolithography on the surface of the flat layer 500 away from the substrate 100 to obtain the light extraction structure 300 as described above.

[0083] In one embodiment, referring to Figure 8 In the structural diagram of the display panel shown, there is a protrusion 330 between adjacent recesses 310, and the boundary of the pixel defining layer 200 is located at the end of the protrusion 330 closest to the pixel defining layer 200 away from the substrate 100. Therefore, the second electrode layer 430 formed on the surface of the pixel defining layer 200 can reflect the light projected onto the surface of the pixel defining layer 300 into the pixel opening 210, avoiding the crosstalk of light between adjacent pixel openings 210, and improving the display quality of the display panel.

[0084] In one embodiment, referring to Figure 8 The orthographic projection of the pixel opening 210 on the substrate 100 is within the orthographic projection range of the light extraction structure 300 on the substrate 100. Thus, it is convenient to set the boundary of the pixel defining layer 200 at the end of the protrusion 330 closest to the pixel defining layer 200 away from the substrate 100.

[0085] In one embodiment, referring to Fig. 9 and Fig.10 In the structural schematic diagram of the display panel shown in FIG. 1 , the spacing between the side walls of the pixel opening 210 gradually increases in the direction parallel to the substrate 100 and pointing to the pixel defining layer 200. That is, in the direction parallel to the substrate 100 and pointing to the pixel defining layer 200, the size of the pixel opening 210 gradually increases. As a result, the light irradiated to the side wall of the pixel opening 210 is reflected into the pixel opening 210, thereby improving the light extraction rate.

[0086] In one embodiment, along a cross section perpendicular to the plane where the substrate 100 is located, the cross-sectional shape of the side wall of the pixel opening 210 includes an arc line (refer to Fig. 9 ) or a straight line (refer to Fig.10 ).

[0087] In one embodiment, referring to Fig.10 The display panel further includes a buffer layer 600, which is located on a side of the substrate 100 close to the flat layer 500; an active layer 910, which is located on a side of the buffer layer 600 close to the flat layer 500; a gate insulating layer 700, which is located on a side of the active layer 910 close to the flat layer 500 and covers the active layer 910; a source electrode 920, a drain electrode 940 and a gate electrode 930, which are all located on a side of the gate insulating layer 700 close to the flat layer 500; an intermediate insulating layer 800, which is located on a side of the source electrode 920, the drain electrode 940 and the gate electrode 930 close to the flat layer 500 and covers the source electrode 920, the drain electrode 940 and the gate electrode 930; a first electrode layer 410 is electrically connected to the drain electrode 940, and the source electrode 920 and the drain electrode 940 are both electrically connected to the active layer 910; the active layer 910, the source electrode 920, the drain electrode 940 and the gate electrode 930 constitute a thin film transistor (TFT) circuit 900.

[0088] For example, the number of pixel openings may be 1 (see Figure 1 ), 2 (ref. Fig.11 ) or more, etc., no more details are given here.

[0089] Exemplarily, the substrate 100 includes: a substrate, which may be a flexible substrate such as glass or polyimide (PI); a buffer layer, located on one side of the substrate, the material of the buffer layer includes SiNx, SiOx, SiOxNy, and the buffer layer has a single-layer or multi-layer structure; a thin film transistor (TFT) array circuit, located on the side of the buffer layer away from the substrate, the thin film transistor array circuit includes an active layer and corresponding gate electrodes, source electrodes, and drain electrodes, the active layer may be one or more of amorphous silicon, low-temperature polycrystalline silicon (LTPS), and metal oxides (such as IGZO), the TFT may be N-type or P-type, the gate may be a top gate or bottom gate structure, and the drain of the TFT is connected to the first electrode layer to control the light emission of the light-emitting functional layer; an insulating layer, located on the side of the thin film transistor array circuit away from the substrate, the material of the insulating layer includes SiNx, SiOx, SiOxNy, and the insulating layer has a single-layer or multi-layer structure.

[0090] Exemplarily, the display panel also includes the structure that a conventional display panel should have, such as an encapsulation layer is arranged on the surface of the pixel defining layer away from the substrate, a touch structure is arranged on the surface of the encapsulation layer away from the substrate, a polarizer is arranged on the surface of the touch structure away from the substrate, a color film structure is arranged on the surface of the polarizer away from the substrate, and a cover plate is arranged on the surface of the color film structure away from the substrate; the encapsulation layer may be a thin film encapsulation layer (TFE), and the cover plate may be glass / ultra-thin glass, transparent PI, etc.

[0091] A second aspect of the present application provides a method for preparing a display panel, referring to Fig.11 The schematic flow chart of the method for preparing a display panel is shown, and the method for preparing the display panel includes the following steps.

[0092] S100: providing a substrate.

[0093] It should be noted that the substrate is consistent with the previous description and will not be described in detail here.

[0094] S200: preparing a light extraction structure on one side of the substrate.

[0095] It should be noted that the light extraction structure is consistent with the previous description and will not be described in detail here. The light extraction structure includes a plurality of recessed portions, at least some of which are located on the same straight line near one end of the substrate, and the angle between the straight line and the plane where the substrate is located is greater than 0° and less than or equal to 45°.

[0096] S300: preparing a first electrode layer on a side of the light extraction structure away from the substrate.

[0097] It should be noted that the orthographic projection of the first electrode layer on the substrate at least partially overlaps with the orthographic projection of the light extraction structure on the substrate.

[0098] It should be noted that the first electrode layer is consistent with the above description and will not be described in detail here.

[0099] S400: preparing a pixel definition layer on the side of the first electrode layer away from the substrate, the pixel definition layer enclosing at least one pixel opening, and the first electrode layer is partially exposed to the pixel opening. It should be noted that the pixel definition layer is consistent with the above description and will not be described in detail here.

[0100] S500: sequentially preparing a light-emitting functional layer and a second electrode layer in the pixel opening to obtain a light-emitting device and a display panel.

[0101] In one embodiment, preparing the light extraction structure on one side of the substrate includes: preparing a flat layer on one side of the substrate; and preparing the light extraction structure on a surface of the flat layer away from the substrate.

[0102] In one embodiment, preparing the light extraction structure on the surface of the flat layer away from the substrate includes: preparing the light extraction structure on the surface of the flat layer away from the substrate by photolithography. Exemplarily, a mask is covered on the surface of the flat layer away from the substrate, the mask is irradiated with a laser, and the flat layer is washed with a specific solution (such as an acid solution or an alkaline solution) to obtain the light extraction structure.

[0103] It should be noted that the method for manufacturing the display panel of this embodiment can be combined with the structure of the display panel of the previous embodiment in whole or in part, and will not be described in detail here.

[0104] A third aspect of the present application provides a display device, which includes the above-mentioned display panel, or includes a display panel prepared by the above-mentioned preparation method.

[0105] It should be noted that, in addition to the display panel, the display device may also include structures that a conventional display device should have, such as a housing, a chip, etc., which will not be elaborated herein.

[0106] Exemplarily, the display device may be a top-emitting OLED display device, and the specific type of the display device may be a mobile phone, a computer, a television, a vehicle-mounted central control, etc.

[0107] The basic principles of the present application are described above in conjunction with specific embodiments. However, it should be noted that the advantages, strengths, effects, etc. mentioned in the present application are only examples and not limitations, and it cannot be considered that these advantages, strengths, effects, etc. are required by each embodiment of the present application. In addition, the specific details disclosed above are only for the purpose of illustration and ease of understanding, not for limitation, and the above details do not limit the present application to being implemented by adopting the above specific details.

[0108] The above description has been given for the purpose of illustration and description. In addition, this description is not intended to limit the embodiments of the present application to the forms disclosed herein. Although multiple example aspects and embodiments have been discussed above, those skilled in the art will recognize certain variations, modifications, changes, additions and sub-combinations thereof.

Claims

1. A display panel, characterized in that: include: substrate; A pixel defining layer, located on one side of the substrate, the pixel defining layer surrounds and forms at least one pixel opening; a light extraction structure, at least partially located in the pixel opening, the light extraction structure comprising a plurality of recessed portions, at least some of the recessed portions being located on a same straight line at one end close to the substrate, and an angle between the straight line and a plane where the substrate is located being greater than 0° and less than or equal to 45°; The light emitting device is at least partially located in the pixel opening and is located on a side of the light extraction structure away from the substrate.

2. The display panel according to claim 1, characterized in that: Along a direction parallel to the centroid of the orthographic projection of the pixel opening on the substrate pointing to the orthographic projection of the pixel defining layer on the substrate, at least some of the multiple recessed portions arranged in sequence have ends close to the substrate located on the same straight line, or at least some of the recessed portions have ends close to the substrate tangent to the same straight line; Preferably, the plurality of recessed portions are centrally symmetrical; Preferably, along a direction perpendicular to the substrate, a line connecting the symmetry centers of the plurality of recessed portions and the centroid of the orthographic projection of the pixel opening on the substrate is perpendicular to the plane where the substrate is located.

3. The display panel according to claim 2, characterized in that: Along a direction parallel to the centroid of the orthographic projection of the pixel opening on the substrate pointing to the orthographic projection of the pixel defining layer on the substrate, ends of the sequentially arranged recessed portions close to the substrate are all located on the same straight line.

4. The display panel according to claim 2, characterized in that: Along the direction parallel to the centroid of the orthographic projection of the pixel opening on the substrate pointing to the orthographic projection of the pixel defining layer on the substrate, the plurality of recessed portions arranged in sequence are divided into a first recessed group and a second recessed group, wherein the second recessed group is located on a side of the first recessed group close to the pixel defining layer; One end of the plurality of recessed portions in the second recessed group close to the substrate is located on the same straight line, and a line connecting one end of the plurality of recessed portions in the first recessed group close to the substrate is parallel to the substrate.

5. The display panel according to claim 2, characterized in that: The plurality of recessed portions arranged in sequence are divided into a plurality of recessed groups along a direction parallel to the centroid of the orthographic projection of the pixel opening on the substrate and pointing to the orthographic projection of the pixel defining layer on the substrate. The plurality of recessed groups include a plurality of third recessed groups, and the plurality of third recessed groups are distributed in steps; One end of a plurality of the recessed portions in the same third recessed group close to the substrate is located on the same straight line; and / or, The ends of the plurality of recessed portions in different third recessed groups close to the substrate are located on the same straight line; Preferably, the plurality of recess groups further include a first recess group, the orthographic projection of the first recess group on the substrate being located on a side of the orthographic projection of the third recess group on the substrate close to the centroid of the orthographic projection of the pixel opening on the substrate; a line connecting one end of the plurality of recesses in the first recess group close to the substrate is parallel to the substrate; Preferably, ends of the multiple recessed portions in different third recessed groups close to the substrate are located on the same straight line, and / or a line connecting ends of the multiple recessed portions in the same third recessed group close to the substrate is parallel to the substrate.

6. The display panel according to any one of claims 1 to 5, characterized in that: The distance between adjacent recessed portions close to one end of the substrate is greater than or equal to 0.5 micrometers and less than or equal to 10 micrometers; Preferably, along a direction perpendicular to the straight line, a distance between an end of the recessed portion away from the substrate and an end of the recessed portion close to the substrate is greater than or equal to 0.5 micrometers and less than or equal to 5 micrometers.

7. The display panel according to any one of claims 1 to 5, characterized in that: Also includes: A planar layer is located on a side of the pixel defining layer close to the substrate, and the light extraction structure is located on a surface of the planar layer away from the substrate; Preferably, there is a convex portion between adjacent concave portions, and the boundary of the pixel defining layer is located at an end of the convex portion closest to the pixel defining layer away from the substrate; Preferably, the shape of the light emitting device is arranged corresponding to the shape of the light extraction structure; Preferably, the light-emitting device comprises a first electrode layer, a light-emitting functional layer, and a second electrode layer which are stacked in sequence, the first electrode layer is located on a side of the light-emitting functional layer close to the light extraction structure, the first electrode layer is partially exposed to the pixel opening, and the reflectivity of the second electrode layer is 15% to 40%; Preferably, the second electrode layer comprises a magnesium-silver alloy; Preferably, the orthographic projection of the pixel opening on the substrate is located within the orthographic projection range of the light extraction structure on the substrate; Preferably, in a direction parallel to the substrate and pointing toward the pixel defining layer, the spacing between the side walls of the pixel opening gradually increases; Preferably, along a cross section perpendicular to the plane where the substrate is located, a cross-sectional shape of the side wall of the pixel opening includes an arc line or a straight line.

8. A method for preparing a display panel, characterized in that: include: providing a substrate; A light extraction structure is prepared on one side of the substrate, wherein the light extraction structure comprises a plurality of recessed portions, at least some of the recessed portions are located on the same straight line at one end close to the substrate, and an angle between the straight line and the plane where the substrate is located is greater than 0° and less than or equal to 45°; A first electrode layer is prepared on a side of the light extraction structure facing away from the substrate, wherein an orthographic projection of the first electrode layer on the substrate at least partially overlaps with an orthographic projection of the light extraction structure on the substrate; A pixel defining layer is formed on a side of the first electrode layer away from the substrate, wherein the pixel defining layer surrounds at least one pixel opening, and a portion of the first electrode layer is exposed to the pixel opening; A light-emitting functional layer and a second electrode layer are sequentially prepared in the pixel opening to obtain a light-emitting device and the display panel.

9. The preparation method according to claim 8, characterized in that: The step of preparing a light extraction structure on one side of the substrate comprises: preparing a flat layer on one side of the substrate; Prepare the light extraction structure on the surface of the flat layer away from the substrate; Preferably, preparing the light extraction structure on the surface of the flat layer away from the substrate comprises: preparing the light extraction structure on the surface of the flat layer away from the substrate by photolithography.

10. A display device, characterized in that: A display panel comprising any one of claims 1 to 7, or a display panel prepared by the preparation method according to claim 8 or 9.

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