Display panel and display device

Abstract

Embodiments of the present application provide a display panel and a display device. In a light extraction layer of the display panel, a peripheral structure surrounds the light extraction structure and has a refractive index less than that of the light extraction structure. The second portion of the light extraction structure is located on a side of the first portion away from the substrate, and the orthographic projection area of the second portion on the substrate is larger than the orthographic projection area of the first portion on the substrate. The first portion includes a first sidewall, and the second portion includes a second sidewall. The first sidewall extends away from a first axis from an end of the first sidewall close to the substrate to an end away from the substrate. The second sidewall extends toward the first axis from an end of the second sidewall close to the substrate to an end away from the substrate. The first axis is perpendicular to the substrate and passes through the center of the orthographic projection of the light extraction structure on the substrate. The luminous brightness and resolution of the display panel can be significantly improved.

Description

Technical field

[0001] The present application relates to the field of display technology, and in particular to a display panel and a display device. [Background Technology]

[0002] Organic Electroluminescence Display (OLED) display panels have been widely used due to their excellent properties such as high brightness, high efficiency, wide viewing angle, and autonomous luminescence.

[0003] Currently, most OLED display panels use a top-emission mode. To maximize the extraction of light from the light-emitting elements and improve the panel's light extraction efficiency, a light extraction layer is usually installed within the panel. This light extraction layer contains a simple lens structure that acts as a light extraction mechanism. This light extraction structure improves light extraction efficiency by refracting light.

[0004] To achieve light extraction, a high-refractive-index layer and a low-refractive-index layer are combined. The high-refractive-index layer is positioned on the side of the low-refractive-index layer facing the light-emitting surface of the display panel. The high-refractive-index layer is a continuous structure. The reflectivity of ambient light hitting the high-refractive-index layer increases. The large area of the high-refractive-index layer also increases the overall reflection of ambient light from the display panel.

[0005] Application Contents

[0006] In view of this, embodiments of the present application provide a display panel and a display device to solve the above problems.

[0007] In a first aspect, an embodiment of the present application provides a display panel, comprising:

[0008] substrate;

[0009] a light extraction layer, disposed on one side of the base substrate; the light extraction layer comprises a plurality of light extraction structures and a peripheral structure, wherein the peripheral structure surrounds the light extraction structure and has a refractive index lower than that of the light extraction structure;

[0010] The light extraction structure includes a first portion and a second portion, the second portion is located on a side of the first portion away from the base substrate, and the orthographic projection area of the second portion on the base substrate is larger than the orthographic projection area of the first portion on the base substrate; the first portion includes an inclined first sidewall, and the second portion includes an inclined second sidewall;

[0011] The first side wall extends in a direction away from a first axis from an end of the first side wall close to the substrate to an end away from the substrate; the second side wall extends in a direction close to the first axis from an end of the second side wall close to the substrate to an end away from the substrate; the first axis is perpendicular to the substrate and passes through the center of the positive projection of the light extraction structure on the substrate.

[0012] In a second aspect, an embodiment of the present application provides a display device, comprising the display panel provided in the first aspect.

[0013] Because the first sidewall of the first portion of the light extraction structure is tilted away from the first axis, high-angle light incident on the first sidewall is converted into relatively small-angle light. However, even within the relatively small-angle light after passing through the first sidewall, some large-angle light still exists. These large-angle light rays are refracted when passing through the second sidewall of the second portion of the light extraction structure during propagation, forming light rays with even smaller angles. The light extraction structure in the display panel provided by the embodiments of the present application can convert more high-angle light rays into small-angle light rays, achieving a better light extraction effect and thereby increasing the brightness of the display panel.

[0014] The peripheral structure surrounds the light extraction structure, and adjacent light extraction structures are not connected. This means that the light extraction structure provided in the embodiments of the present application is an island structure. Since the light extraction structure has a high refractive index, configuring it as an island structure eliminates the presence of structures with a higher refractive index between adjacent light extraction structures. This reduces reflection of light from the higher refractive index film layer on the display panel, thereby improving the resolution and display quality of the display panel.

Brief Description of the Drawings

[0015] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the following briefly introduces the drawings required for use in the embodiments. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without any creative work.

[0016] Figure 1 A schematic diagram of a display panel provided in an embodiment of the present application;

[0017] Figure 2 A schematic diagram showing the effect of a light extraction structure in a display panel provided by an embodiment of the present application;

[0018] Figure 3 A schematic diagram of a display panel provided in an embodiment of the present application;

[0019] Figure 4A schematic diagram of a display panel provided in an embodiment of the present application;

[0020] Figure 5 A schematic diagram of a display panel provided in an embodiment of the present application;

[0021] Figure 6 A schematic diagram of a display panel provided in an embodiment of the present application;

[0022] Figure 7 A schematic diagram of a display panel provided in an embodiment of the present application;

[0023] Figure 8 A schematic diagram of a display panel provided in an embodiment of the present application;

[0024] Figure 9 A schematic diagram of a display panel provided in an embodiment of the present application;

[0025] Figure 10 A schematic diagram of a display panel provided in an embodiment of the present application;

[0026] Figure 11 A schematic diagram of a light extraction structure in a display panel provided in an embodiment of the present application;

[0027] Figure 12 A schematic diagram of a light extraction structure in a display panel provided in an embodiment of the present application;

[0028] Figure 13 A schematic diagram of a light extraction structure in a display panel provided in an embodiment of the present application;

[0029] Figure 14 A schematic diagram of a light extraction structure in a display panel provided in an embodiment of the present application;

[0030] Figure 15 A schematic diagram of a light extraction structure in a display panel provided in an embodiment of the present application;

[0031] Figure 16 A schematic diagram of a light extraction structure in a display panel provided in an embodiment of the present application;

[0032] Figure 17 A schematic diagram of a light extraction structure in a display panel provided in an embodiment of the present application;

[0033] Figure 18 A schematic diagram of a light extraction structure in a display panel provided in an embodiment of the present application;

[0034] Figure 19 A schematic diagram of a light extraction structure in a display panel provided in an embodiment of the present application;

[0035] Figure 20 A schematic diagram of a light extraction structure in a display panel provided in an embodiment of the present application;

[0036] Figure 21 A schematic diagram of a display panel provided in an embodiment of the present application;

[0037] Figure 22 for Figure 21 Schematic cross-section diagram along the M1-M2 direction;

[0038] Figure 23 A schematic diagram of a display panel provided in an embodiment of the present application;

[0039] Figure 24 for Figure 23 Schematic cross-section along the N1-N2 direction;

[0040] Figure 25 A schematic diagram of a display panel provided in an embodiment of the present application;

[0041] Figure 26 A schematic diagram of a display panel provided in an embodiment of the present application;

[0042] Figure 27 A schematic diagram of a display device provided in an embodiment of the present application. [Specific implementation method]

[0043] In order to better understand the technical solution of the present application, the embodiments of the present application are described in detail below with reference to the accompanying drawings.

[0044] It should be clear that the embodiments described are only part of the embodiments of this application, not all of the embodiments. Based on the embodiments in this application, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of this application.

[0045] The terms used in the embodiments of the present application are for the purpose of describing specific embodiments only and are not intended to limit the present application. The singular forms "a", "an", "the" and "the" used in the embodiments of the present application and the appended claims are also intended to include plural forms unless the context clearly indicates otherwise.

[0046] It should be understood that the term "and / or" as used herein is merely a description of the relationship between associated objects, indicating that three possible relationships exist. For example, "A and / or B" can represent: A exists alone, A and B exist simultaneously, or B exists alone. Furthermore, the character " / " in this document generally indicates that the associated objects are in an "or" relationship.

[0047] In the description of this specification, it is necessary to understand that the words "substantially", "approximately", "approximately", "about", "roughly", "generally" and the like described in the claims and embodiments of this application refer to what can be generally recognized within a reasonable process operation range or tolerance range, rather than an exact value.

[0048] It should be understood that although the terms "first," "second," and "third" may be used to describe sidewalls and the like in the embodiments of the present application, these sidewalls and the like should not be limited to these terms. These terms are merely used to distinguish the sidewalls and the like from one another. For example, without departing from the scope of the embodiments of the present application, the first sidewall may also be referred to as the second sidewall, and similarly, the second sidewall may also be referred to as the first sidewall.

[0049] The applicant in this case has provided a solution to the problems existing in the prior art through careful and in-depth research.

[0050] Figure 1 A schematic diagram of a display panel provided in an embodiment of the present application.

[0051] like Figure 1 As shown, the display panel 001 provided in the embodiment of the present application includes a base substrate 01 and a light extraction layer 02, and the light extraction layer 02 is arranged on one side of the base substrate 01. Specifically, the light extraction layer 02 is arranged on the side of the base substrate 01 facing the light output surface of the display panel 001.

[0052] The light extraction layer 02 includes a plurality of light extraction structures 21 and a peripheral structure 22, wherein the peripheral structure 22 surrounds the light extraction structure 21. The refractive index of the peripheral structure 22 is smaller than that of the light extraction structure 21, and the interface between the light extraction structure 21 and the peripheral structure 22 surrounding it is the interface between an optically dense medium and an optically sparse medium.

[0053] In this embodiment, if Figure 1 As shown, the light extraction structure 21 includes a first portion 211 and a second portion 212. The second portion 212 is located on a side of the first portion 211 away from the substrate 01, and the orthographic projection area of the second portion 212 on the substrate 01 is larger than the orthographic projection area of the first portion 211 on the substrate 01. The first portion 211 and the second portion 212 are different portions of the light extraction structure 21, and the second portion 212 is located on a side of the first portion 211 away from the substrate 01 and covers the first portion 211.

[0054] The first portion 211 includes an inclined first sidewall 2110. The inclined surface of the first portion 211 that contacts the peripheral structure 22 adjacent thereto can be considered the first sidewall 2110 of the first portion 211. The first sidewall 2110 extends from the end of the first sidewall 2110 proximal to the substrate 01 toward the end distal thereto, away from the first axis Z1. The first axis Z1 is perpendicular to the substrate 01 and passes through the center of the orthographic projection of the light extraction structure 21 on the substrate 01. The portion of the first portion 211 surrounded by the first sidewall 2110 has a structure with a gradually changing width, wider at the top and narrower at the bottom. The upper and lower positional relationship can be referenced to the positional relationship between the light extraction layer 02 and the substrate 01: the light extraction layer 02 is above the substrate 01, and the substrate 01 is below the light extraction layer 02.

[0055] The second portion 212 includes an inclined second sidewall 2120. The inclined surface of the second portion 212 that contacts the peripheral structure 22 adjacent thereto can be considered the second sidewall 2120 of the second portion 212. The second sidewall 2120 extends from the end of the second sidewall 2120 proximate to the base substrate 01 toward the end away from the base substrate 01, and in a direction approaching the first axis Z1. The portion of the second portion 212 surrounded by the second sidewall 2120 has a structure with a gradually changing width, narrower at the top and wider at the bottom.

[0056] In the light extraction structure 21 included in the display panel 001 provided in an embodiment of the present application, at least part of the side wall of the first part 211 close to the base substrate 01 is inclined in a direction away from the first axis Z1, and at least part of the side wall of the second part 212 away from the base substrate 01 is inclined in a direction close to the first axis Z1.

[0057] Figure 2 A schematic diagram of the effect of a light extraction structure in a display panel provided in an embodiment of the present application.

[0058] Please combine Figure 1 and Figure 2 Since the first side wall 2110 of the first part 211 in the light extraction structure 21 is inclined in the direction away from the first axis Z1, when large-angle light is irradiated on the first side wall 2110 of the light extraction structure 21, the amount of large-angle light L1 with an incident angle greater than or equal to the critical angle is large, and these large-angle lights L1 are reflected at the first side wall 2110 and become light L1' with a smaller angle; large-angle light L2 with an incident angle less than the critical angle is refracted when it is incident on the peripheral structure 22, and these large-angle lights L2 are also converted into light L2' with a smaller angle.

[0059] Among the light L1' reflected from the first sidewall 2110 and the light L2' refracted from the second sidewall 2120, some light with a larger angle still exists. These light L1' and L2' with a larger angle are refracted when propagating through the second sidewall 2120 of the second portion 212 of the light extraction structure 21, forming light with a smaller angle. The light extraction structure 21 in the display panel 001 provided in the embodiment of the present application can convert more large-angle light into small-angle light, achieving a better light extraction effect and thereby increasing the brightness of the display panel 001.

[0060] It should be noted that the first sidewall 2110 of the first portion 211 is inclined in a direction away from the first axis Z1, and the distance between the end of the first sidewall 2110 away from the base substrate 01 and the first axis Z1 is greater than the distance between the end of the first sidewall 2110 closer to the base substrate 01 and the first axis Z1. The second sidewall 2120 of the second portion 212 is inclined in the direction of the first axis Z1, and the distance between the end of the second sidewall 2120 away from the base substrate 01 and the first axis Z1 is less than the distance between the end of the second sidewall 2120 closer to the base substrate 01 and the first axis Z1.

[0061] Furthermore, the peripheral structure 22 surrounds the light extraction structure 21, and adjacent light extraction structures 21 are not connected. This means that the light extraction structure 21 provided in this embodiment of the present application is an isolated island structure. Since the light extraction structure 21 has a relatively high refractive index, configuring it as an isolated island structure eliminates the presence of structures with a relatively high refractive index between adjacent light extraction structures 21. This reduces reflection of light from the display panel 001 by the high-refractive-index film layer, thereby improving the resolution and display quality of the display panel.

[0062] Figure 3 A schematic diagram of a display panel provided in an embodiment of the present application.

[0063] Optional, such as Figure 3 As shown, the light extraction structure 21 may also be a structure arranged on the entire surface, and the light extraction structures are connected to form an entire surface arrangement through the connection structure 20 , wherein the material of the connection structure 20 may be the same as that of the second portion 212 .

[0064] Since the light extraction structure 21 is composed of a first portion 211 and a second portion 212 having different orthographic projection areas, the peripheral structure 22 surrounding the light extraction structure 21 may include a portion 221 surrounding the first portion 211 and a portion 222 surrounding the second portion 212. The portion 221 and the portion 222 included in the peripheral structure 22 may be made of the same material and manufactured integrally, or may be made of different materials and manufactured in layers.

[0065] Figure 4 A schematic diagram of a display panel provided in an embodiment of the present application.

[0066] like Figure 4 As shown, the display panel 001 provided in the embodiment of the present application further includes a light-emitting device layer 03, which is located between the light extraction layer 02 and the base substrate 01. That is, the light extraction layer 02 can be disposed on the side of the light-emitting device layer 03 away from the base substrate 01. The light-emitting device layer 03 includes a plurality of light-emitting devices 30, and the orthographic projection of the light extraction structure 21 on the base substrate 01 overlaps with the orthographic projection of the light-emitting device 30 on the base substrate 01. The light extraction structure 21 can extract light emitted by the light-emitting device 30 with which it overlaps.

[0067] In the light-emitting device 30 and the light extraction structure 21 whose orthographic projections overlap, the orthographic projection area of the second part 212 on the substrate 01 is larger than the orthographic projection area of the light-emitting device 30 on the substrate 01, so that the second part 212 with a larger area in the light extraction structure 21 can completely cover the light-emitting device 30, so that the light extraction structure 21 can extract as much light as possible emitted by the light-emitting device 30, and more light can be emitted from the orthographic viewing direction corresponding to the light-emitting device 30.

[0068] The light emitting device 30 may be an organic light emitting diode (OLED), or may be at least one of a micro light emitting diode (Micro-LED) and a sub-millimeter light emitting diode (Mini-LED).

[0069] In addition, in the light-emitting device 30 and the light extraction structure 21 where the orthographic projections overlap, the orthographic projection area of the first part 211 on the substrate 01 is greater than or equal to the orthographic projection area of the light-emitting device 30 on the substrate 01, so as to ensure that as much light as possible emitted by the light-emitting device 30 reaches the light extraction structure 21.

[0070] In some embodiments of the present application, Figure 4 As shown, the orthographic projection of the second side wall 2120 on the substrate 01 does not overlap with the orthographic projection of the light-emitting device 30 on the substrate 01. This means that, in the case of the light extraction structure 21 and the light-emitting device 30 whose orthographic projections overlap, the orthographic projection of the second side wall 2120 on the substrate 01 is located outside the orthographic projection of the light-emitting device 30 on the substrate 01. This prevents the second side wall 2120 from changing the optical path of small-angle light that can be emitted from the light-emitting device 30 at an orthographic viewing angle, thereby ensuring the amount of light emitted from the light-emitting device 30 at an orthographic viewing angle.

[0071] Furthermore, the orthographic projection of the first sidewall 2110 on the substrate 01 does not overlap with the orthographic projection of the light-emitting device 30 on the substrate 01. This means that, in the case of the light extraction structure 21 and the light-emitting device 30 whose orthographic projections overlap, the orthographic projection of the first sidewall 2110 on the substrate 01 is located outside the orthographic projection of the light-emitting device 30 on the substrate 01. This prevents the first sidewall 2110 from changing the optical path of small-angle light rays that can be emitted from the light-emitting device 30 at an orthographic viewing angle, thereby ensuring the amount of light emitted from the light-emitting device 30 at an orthographic viewing angle.

[0072] The display panel 001 provided in the embodiment of the present application may further include a pixel circuit layer 04 , wherein the pixel circuit layer 04 includes a plurality of pixel circuits 40 . The pixel circuits 40 are electrically connected to the light-emitting device 30 and can provide a light-emitting driving current for the light-emitting device 30 .

[0073] Figure 5 A schematic diagram of a display panel provided in an embodiment of the present application.

[0074] like Figure 5 As shown, the multiple light-emitting devices 30 included in the light-emitting device layer 03 include a first light-emitting device 30a and a second light-emitting device 30b. Correspondingly, the multiple light extraction structures 21 included in the light extraction layer 02 include a first light extraction structure 21a and a second light extraction structure 21b. The orthographic projection of the first light extraction structure 21a on the substrate 01 overlaps with the orthographic projection of the first light-emitting device 30a on the substrate 01, and the orthographic projection of the second light extraction structure 21b on the substrate 01 overlaps with the orthographic projection of the second light-emitting device 30b on the substrate 01. The first light extraction structure 21a is used to extract light emitted by the first light-emitting device 30a, and the second light extraction structure 21b is used to extract light emitted by the second light-emitting device 30b.

[0075] The distance between the edge of the orthographic projection of the first light extraction structure 21a on the substrate 01 and the edge of the orthographic projection of the first light emitting device 30a on the substrate 01 is d1, and the distance between the edge of the orthographic projection of the second light extraction structure 21b on the substrate 01 and the edge of the orthographic projection of the second light emitting device 30b on the substrate 01 is d2. In other words, the distance between the edge of the orthographic projection of the second portion 212 in the first light extraction structure 21a on the substrate 01 and the edge of the orthographic projection of the first light emitting device 30a on the substrate 01 is d1, and the distance between the edge of the orthographic projection of the second portion 212 in the second light extraction structure 21b on the substrate 01 and the edge of the orthographic projection of the second light emitting device 30b on the substrate 01 is d2.

[0076] In some embodiments of the present application, along a direction perpendicular to the base substrate 01, the distance between an end of the second side wall 2120 in the first light extraction structure 21a away from the first part 211 and an end of the first part 211 away from the second part 212 is h1, and the distance between an end of the second side wall 2120 in the second light extraction structure 21b away from the first part 211 and an end of the first part 211 away from the second part 212 is h2. It can be understood that the distance in this embodiment is the distance in the direction perpendicular to the base substrate 01.

[0077] Where d1>d2, and h1>h2. That is, the more the light extraction structure 21 protrudes from the light-emitting device 30 it overlaps in a direction parallel to the base substrate 01, the farther the top of the second sidewall 2120 in the light extraction structure 21 is from the first portion 211 in a direction perpendicular to the base substrate 01.

[0078] like Figure 5 As shown, when the first light extraction structure 21a protrudes further from the light-emitting device 30 it overlaps in a direction parallel to the base substrate 01, the large-angle light emitted by the light-emitting device 30 reaches the first sidewall 2110 of the first light extraction structure 21a, is reflected or refracted, and then propagates toward the second portion 212. When these light rays reach the sidewall of the second portion 212 of the first light extraction structure 21a, the path they traverse has more components parallel to the base substrate 01. By positioning the top of the second sidewall 2120 of the first light extraction structure 21a farther from the bottom surface of the first portion 211 in a direction perpendicular to the base substrate 01, more light reflected or refracted at the first sidewall 2110 of the first light extraction structure 21a is captured by the second sidewall 2120 of the first light extraction structure 21a. Otherwise, more light reflected or refracted at the first sidewall 2110 of the first light extraction structure 21a would be emitted from above the second sidewall 2120 without passing through the second sidewall 2120.

[0079] Figure 6 A schematic diagram of a display panel provided in an embodiment of the present application.

[0080] In some embodiments of the present application, along a direction perpendicular to the base substrate 01, the distance between an end of the second sidewall 2120 of the first light extraction structure 21a close to the first portion 211 and an end of the first portion 211 away from the second portion 212 is h1', and the distance between an end of the second sidewall 2120 of the second light extraction structure 21b close to the first portion 211 and an end of the first portion 211 away from the second portion 212 is h2'. It will be understood that the distances in this embodiment are distances in a direction perpendicular to the base substrate 01.

[0081] Wherein, d1>d2, and h1'>h2'. That is, the more the light extraction structure 21 protrudes from the light emitting device 30 it overlaps in a direction parallel to the base substrate 01, the farther the bottom end of the second sidewall 2120 in the light extraction structure 21 is from the first portion 211 in a direction perpendicular to the base substrate 01.

[0082] like Figure 6 As shown, when the first light extraction structure 21a protrudes more than the light-emitting device 30 it overlaps in a direction parallel to the base substrate 01, the large-angle light emitted by the light-emitting device 30 reaches the first sidewall 2110 of the first light extraction structure 21a and is reflected or refracted before propagating toward the second portion 212. When these light rays reach the sidewall of the second portion 212 of the first light extraction structure 21a, the path they traverse has more components parallel to the base substrate 01. By positioning the bottom end of the second sidewall 2120 of the first light extraction structure 21a farther from the first portion 211 in a direction perpendicular to the base substrate 01, more light rays reflected or refracted at the first sidewall 2110 of the first light extraction structure 21a will be captured by the second sidewall 2120 of the first light extraction structure 21a.

[0083] Figure 7 A schematic diagram of a display panel provided in an embodiment of the present application.

[0084] In some embodiments of the present application, d1>d2, and h1>h2, h1'>h2'.

[0085] That is, the more the light extraction structure 21 protrudes beyond the light-emitting device 30 it overlaps in a direction parallel to the base substrate 01, the closer the bottom end of the second side wall 2120 in the light extraction structure 21 is to the first portion 211 in a direction perpendicular to the base substrate 01, and the further the top end of the second side wall 2120 in the light extraction structure 21 is from the first portion 211 in a direction perpendicular to the base substrate 01. This ensures that as much wide-angle light as possible emitted by the first light-emitting device 30a can pass through the second side wall 2120 after being reflected or refracted by the first side wall 2110 of the first light extraction structure 21a.

[0086] Furthermore, the more the light extraction structure 21 protrudes beyond the light-emitting devices 30 it overlaps in a direction parallel to the base substrate 01, the farther the top of the second side wall 2120 in the light extraction structure 21 is from the first portion 211 in a direction perpendicular to the base substrate 01, and the farther the bottom of the second side wall 2120 in the light extraction structure 21 is from the first portion 211 in a direction perpendicular to the base substrate 01. This ensures that as much wide-angle light as possible emitted by the first light-emitting device 30a can pass through the second side wall 2120 after being reflected or refracted by the first side wall 2110 of the first light extraction structure 21a. Furthermore, the inclined sidewalls of the second portion 212 in the first light extraction structure 21a are not too long, thereby avoiding the problem of increased reflectivity of the display panel 001 to external light due to the second portion 212 being too wide in a direction parallel to the base substrate 01.

[0087] The minimum distances between different points in the edge of the orthographic projection of the first light extraction structure 21a on the substrate substrate 01 and the edge of the orthographic projection of the first light emitting device 30a on the substrate substrate 01 may be equal or unequal. When there is a point in the edge of the orthographic projection of the first light extraction structure 21a on the substrate substrate 01 that is unequal to the minimum distance between the edge of the orthographic projection of the first light emitting device 30a on the substrate substrate 01, the distance d1 between the edge of the orthographic projection of the first light extraction structure 21a on the substrate substrate 01 and the edge of the orthographic projection of the first light emitting device 30a on the substrate substrate 01 refers to the distance corresponding to those points in the edge of the orthographic projection of the first light extraction structure 21a on the substrate substrate 01 that have the most equal distances from the edge of the orthographic projection of the first light emitting device 30a on the substrate substrate 01, or refers to the average value of the distances between all points in the edge of the orthographic projection of the first light extraction structure 21a on the substrate substrate 01 and the edge of the orthographic projection of the first light emitting device 30a on the substrate substrate 01.

[0088] The minimum distances between different points in the edge of the orthographic projection of the second light extraction structure 21b on the substrate substrate 01 and the edge of the orthographic projection of the second light emitting device 30b on the substrate substrate 01 may be equal or unequal. When there is a point in the edge of the orthographic projection of the second light extraction structure 21b on the substrate substrate 01 that is unequal to the minimum distance between the edge of the orthographic projection of the second light emitting device 30b on the substrate substrate 01, the distance d2 between the edge of the orthographic projection of the second light extraction structure 21b on the substrate substrate 01 and the edge of the orthographic projection of the second light emitting device 30b on the substrate substrate 01 refers to the distance corresponding to those points in the edge of the orthographic projection of the second light extraction structure 21b on the substrate substrate 01 that have the most equal distances from the edge of the orthographic projection of the second light emitting device 30b on the substrate substrate 01, or refers to the average value of the distances between all points in the edge of the orthographic projection of the second light extraction structure 21b on the substrate substrate 01 and the edge of the orthographic projection of the second light emitting device 30b on the substrate substrate 01.

[0089] Figure 8 A schematic diagram of a display panel provided in an embodiment of the present application.

[0090] like Figure 8 As shown, the multiple light-emitting devices 30 included in the light-emitting device layer 03 include a third light-emitting device 30c and a fourth light-emitting device 30d, and the light-emitting area of the third light-emitting device 30c is larger than the light-emitting area of the fourth light-emitting device 30d. Correspondingly, the multiple light extraction structures 21 included in the light extraction layer 02 include a third light extraction structure 21c and a fourth light extraction structure 21d. The orthographic projection of the third light extraction structure 21c on the substrate 01 overlaps with the orthographic projection of the third light-emitting device 30c on the substrate 01, and the orthographic projection of the fourth light extraction structure 21d on the substrate 01 overlaps with the orthographic projection of the fourth light-emitting device 30d on the substrate 01. The third light extraction structure 21c is used to extract light emitted by the third light-emitting device 30c, and the fourth light extraction structure 21d is used to extract light emitted by the fourth light-emitting device 30d.

[0091] In one embodiment, Figure 8 As shown, in the orthographic projection of the first sidewall 2110 and the second sidewall 2120 included in the third light extraction structure 21c on the base substrate 01, the distance between the end of the orthographic projection of the first sidewall 2110 away from the orthographic projection of the second sidewall 2120 and the end of the orthographic projection of the second sidewall 2120 away from the orthographic projection of the first sidewall 2110 is d3. It can be understood that the width of the orthographic projection of the portion of the third light extraction structure 21c including the inclined sidewall on the base substrate 01 is d3.

[0092] In the orthographic projection of the first sidewall 2110 and the second sidewall 2120 included in the fourth light extraction structure 21d on the base substrate 01, the distance between the end of the orthographic projection of the first sidewall 2110 away from the orthographic projection of the second sidewall 2120 and the end of the orthographic projection of the second sidewall 2120 away from the orthographic projection of the first sidewall 2110 is d4. It can be understood that the width of the orthographic projection of the portion of the fourth light extraction structure 21d including the inclined sidewall on the base substrate 01 is d4.

[0093] In this case, d3≤d4. That is, in the light extraction structure 21 above the light emitting device 30 with a larger light emitting area, the distance between the end of the first side wall 2110 away from the second side wall 2120 and the end of the second side wall 2120 away from the first side wall 2110 in the direction parallel to the base substrate 01 is smaller.

[0094] If the light extraction structures 21 above light-emitting devices 30 with different light-emitting areas adopt a completely identical design, the light extraction effect of the light extraction structure 21 corresponding to the light-emitting device 30 with a smaller light-emitting area will be greater than the light extraction effect of the light extraction structure 21 corresponding to the light-emitting device 30 with a larger light-emitting area. This is because the wide-angle light emitted by the light-emitting device 30 with a smaller light-emitting area will be more concentratedly captured by the light extraction structure 21 above it and converted into narrow-angle light.

[0095] By designing the portion of the light extraction structure 21 corresponding to the light-emitting device 30 with a large light-emitting area, which mainly realizes the light extraction function and includes the inclined side wall, to be narrower, more large-angle light can be captured, that is, the light extraction effect of the light extraction structure 21 on the light emitted by the light-emitting device 30 with a large light-emitting area is improved, thereby balancing the brightness of the sub-pixels corresponding to the light-emitting devices 30 with different light-emitting areas.

[0096] For example, when the light emitting area of the blue light emitting device 30 is larger than that of the green light emitting device 30, and the light emitting area of the green light emitting device 30 is larger than that of the red light emitting device 30, then in the direction parallel to the base substrate 01, the distance between the end of the first side wall 2110 of the light extraction structure 21 corresponding to the blue light emitting device 30 away from the second side wall 2120 and the end of the second side wall 2120 away from the first side wall 2110 is smaller than the distance between the end of the first side wall 2110 of the light extraction structure 21 corresponding to the green light emitting device 30 away from the first side wall 2120. The distance between one end of the second side wall 2120 and one end of the second side wall 2120 away from the first side wall 2110, and the distance between one end of the first side wall 2110 of the light extraction structure 21 corresponding to the green light-emitting device 30 away from the second side wall 2120 and one end of the second side wall 2120 away from the first side wall 2110 is smaller than the distance between one end of the first side wall 2110 of the light extraction structure 21 corresponding to the red light-emitting device 30 away from the second side wall 2120 and one end of the second side wall 2120 away from the first side wall 2110.

[0097] Assume that the edge of the orthographic projection of the first side wall 2110 on the base substrate 01 away from the orthographic projection of the second side wall 2120 on the base substrate 01 is the first edge, and the edge of the orthographic projection of the second side wall 2120 on the base substrate 01 away from the orthographic projection of the first side wall 2110 on the base substrate 01 is the second edge.

[0098] Then, in the orthographic projection of the third light extraction structure 21c, the minimum distances between different points in the first edge and the second edge may be equal or unequal. When there is a point in the first edge of the third light extraction structure 21c that is unequal to the minimum distance between the first edge and the second edge, the distance d3 between the end of the orthographic projection of the first sidewall 2110 that is farthest from the orthographic projection of the second sidewall 2120 and the end of the orthographic projection of the second sidewall 2120 that is farthest from the orthographic projection of the first sidewall 2110 is the distance corresponding to those points in the first edge of the third light extraction structure 21c that have the most equal distances from the second edge, or the average value of the distances between all points in the first edge of the third light extraction structure 21c and the second edge.

[0099] Then, in the orthographic projection of the fourth light extraction structure 21d, the minimum distances between different points in the first edge and the second edge may be equal or unequal. When there is a point in the first edge of the fourth light extraction structure 21d that has a unequal minimum distance to the second edge, the distance d4 between the end of the orthographic projection of the first sidewall 2110 that is farthest from the orthographic projection of the second sidewall 2120 and the end of the orthographic projection of the second sidewall 2120 that is farthest from the orthographic projection of the first sidewall 2110 is the distance corresponding to those points in the first edge of the fourth light extraction structure 21d that have the most equal distances from the second edge, or the average value of the distances between all points in the first edge of the fourth light extraction structure 21d and the second edge.

[0100] Figure 9 A schematic diagram of a display panel provided in an embodiment of the present application is shown. Figure 10 A schematic diagram of a display panel provided in an embodiment of the present application.

[0101] In one embodiment, Figure 9 and Figure 10 As shown, the sidewall with a changing curvature in the second sidewall 2120 of the light extraction structure 21 is the first sub-sidewall, and the minimum angles between the sections of the first sub-sidewall corresponding to the light-emitting devices 30 with different light-emitting areas and the first axis Z1 may be different.

[0102] It should be noted that the first sub-sidewall is a curved surface, and the minimum angles between the cross-sections of the first sub-sidewalls in different second sidewalls 2120 and the first axis Z1 may be different.

[0103] like Figure 9 and Figure 10 As shown, the minimum angle between the tangent plane of the first sub-sidewall in the second sidewall 2120 of the third light extraction structure 21c and the first axis Z1 is θ1, and the minimum angle between the tangent plane of the first sub-sidewall in the second sidewall 2120 of the fourth light extraction structure 21d and the first axis Z1 is θ2. Since the light-emitting areas of the third light-emitting device 30c and the fourth light-emitting device 30d are different, θ1 and θ2 are different.

[0104] In a technical solution corresponding to this embodiment, as Figure 9 As shown, when θ1 is less than a preset value and θ2 is less than a preset value, θ1>θ2. That is, when the minimum angle between the tangent plane of the first sub-sidewall in the second sidewall 2120 of the third light extraction structure 21c and the first axis Z1 and the minimum angle between the first sub-sidewall in the second sidewall 2120 of the fourth light extraction structure 21d and the first axis Z1 are both less than the preset value, the minimum angle between the tangent plane of the first sub-sidewall in the second sidewall 2120 of the third light extraction structure 21c and the first axis Z1 is greater than the minimum angle between the tangent plane of the first sub-sidewall in the second sidewall 2120 of the fourth light extraction structure 21d and the first axis Z1. The preset value may be 35°.

[0105] In this technical solution, the minimum angle between the tangent plane of the first sub-sidewall with a changed curvature in the second sidewall 2120 of the light extraction structure 21 above the light emitting device 30 with a larger light emitting area and the first axis Z1 is larger.

[0106] For example, when the light emitting area of the blue light emitting device 30 is larger than the light emitting area of the green light emitting device 30, and the light emitting area of the green light emitting device 30 is larger than the light emitting area of the red light emitting device 30, the minimum angle between the tangent plane of the first sub-side wall in the second side wall 2120 of the light extraction structure 21 corresponding to the blue light emitting device 30 and the first axis Z1 is smaller than the preset value, the minimum angle between the tangent plane of the first sub-side wall in the second side wall 2120 of the light extraction structure 21 corresponding to the green light emitting device 30 and the first axis Z1 is smaller than the preset value, and the minimum angle between the tangent plane of the first sub-side wall in the second side wall 2120 of the light extraction structure 21 corresponding to the red light emitting device 30 and the first axis Z1 is smaller than the preset value. 1 is less than a preset value, the minimum angle between the cross-section of the first sub-side wall in the second side wall 2120 of the light extraction structure 21 corresponding to the blue light-emitting device 30 and the first axis Z1 is greater than the minimum angle between the cross-section of the first sub-side wall in the second side wall 2120 of the light extraction structure 21 corresponding to the green light-emitting device 30 and the first axis Z1, and the minimum angle between the cross-section of the first sub-side wall in the second side wall 2120 of the light extraction structure 21 corresponding to the green light-emitting device 30 and the first axis Z1 is greater than the minimum angle between the cross-section of the first sub-side wall in the second side wall 2120 of the light extraction structure 21 corresponding to the red light-emitting device 30 and the first axis Z1.

[0107] In a technical solution corresponding to this embodiment, as Figure 10As shown, when θ1 is less than a preset value and θ2 is greater than a preset value, θ1<θ2. That is, when the minimum angle between the tangent plane of the first sub-sidewall in the second sidewall of the third light extraction structure 21c and the first axis Z1 and the minimum angle between the tangent plane of the first sub-sidewall in the second sidewall of the fourth light extraction structure and the first axis Z1 are both greater than the preset value, the minimum angle between the tangent plane of the first sub-sidewall in the second sidewall of the third light extraction structure 21c and the first axis Z1 is less than the minimum angle between the tangent plane of the first sub-sidewall in the second sidewall of the fourth light extraction structure and the first axis Z1. The preset value is 35°.

[0108] In this technical solution, the minimum angle between the tangent plane of the first sub-sidewall in the second sidewall 2120 of the light extraction structure 21 above the light emitting device 30 with a larger light emitting area and the first axis Z1 is smaller.

[0109] For example, when the light-emitting area of the blue light-emitting device 30 is larger than the light-emitting area of the green light-emitting device 30, and the light-emitting area of the green light-emitting device 30 is larger than the light-emitting area of the red light-emitting device 30, the minimum angle between the tangent plane of the first sub-side wall in the second side wall 2120 of the light extraction structure 21 corresponding to the blue light-emitting device 30 and the first axis Z1 is greater than the preset value, the minimum angle between the tangent plane of the first sub-side wall in the second side wall 2120 of the light extraction structure 21 corresponding to the green light-emitting device 30 and the first axis Z1 is greater than the preset value, and the minimum angle between the tangent plane of the first sub-side wall in the second side wall 2120 of the light extraction structure 21 corresponding to the red light-emitting device 30 and the first axis Z1 is greater than the preset value. If the minimum angle between the first sub-side wall in the second side wall 2120 of the light extraction structure 21 corresponding to the blue light-emitting device 30 and the first axis Z1 is greater than the preset value, the minimum angle between the cross-section of the first sub-side wall in the second side wall 2120 of the light extraction structure 21 corresponding to the green light-emitting device 30 and the first axis Z1 is smaller than the minimum angle between the cross-section of the first sub-side wall in the second side wall 2120 of the light extraction structure 21 corresponding to the green light-emitting device 30 and the first axis Z1, and the minimum angle between the cross-section of the first sub-side wall in the second side wall 2120 of the light extraction structure 21 corresponding to the green light-emitting device 30 and the first axis Z1 is smaller than the minimum angle between the cross-section of the first sub-side wall in the second side wall 2120 of the light extraction structure 21 corresponding to the red light-emitting device 30 and the first axis Z1.

[0110] After experimental verification, the inventor found that, when other parameters are the same, the minimum angle between the cross-section of the first sub-side wall in the second side wall 2120 of the light extraction structure 21 and the first axis Z1 is not positively correlated or negatively correlated with the light extraction ability. When the minimum angle between the cross-section of the first sub-side wall in the second side wall 2120 of the light extraction structure 21 and the first axis Z1 is less than a preset value, the larger the minimum angle between the cross-section of the first sub-side wall in the second side wall 2120 of the light extraction structure 21 and the first axis Z1, the stronger the light extraction ability of the light extraction structure 21; when the minimum angle between the cross-section of the first sub-side wall in the second side wall 2120 of the light extraction structure 21 and the first axis Z1 is greater than the preset value, the smaller the minimum angle between the cross-section of the first sub-side wall in the second side wall 2120 of the light extraction structure 21 and the first axis Z1, the stronger the light extraction ability of the light extraction structure 21.

[0111] In addition, the light-emitting device 30 with lower luminous efficiency has a larger light-emitting area. Therefore, in the embodiment of the present application, the minimum angles between the tangent plane of the first sub-sidewall in the second sidewall 2120 of the light extraction structure 21 above the light-emitting devices 30 with different light-emitting areas and the first axis Z1 are set to be different, which can effectively balance the light-emitting brightness of the sub-pixels corresponding to the light-emitting devices 30 with different light-emitting areas.

[0112] Figure 11 A schematic diagram of a light extraction structure in a display panel provided in an embodiment of the present application.

[0113] In some embodiments, at least a portion of the second portion 212 of the light extraction structure 21 includes a third sidewall 2120 ′. Figure 11 As shown, the third sidewall 2120' is located at one end of the second sidewall 2120 close to the first sidewall 2110 and is parallel to the first axis Z1. That is, at least the light extraction structure 21 includes a vertical third sidewall 2120' between the first sidewall 2110 and the second sidewall 2120.

[0114] By setting the third side wall 2120', the distance between the bottom and top ends of the second side wall 2120 and the first side wall 2110 in the direction perpendicular to the substrate 01 can be adjusted, so that when the distance between the top end of the second side wall 2120 and the first side wall 2110 in the direction perpendicular to the substrate 01 increases, the area of the second portion 212 of the light extraction structure 21 that expands outward relative to the first portion 211 in the direction parallel to the substrate 01 will not increase excessively.

[0115] The structure of the light extraction structure 21 provided in this embodiment can be applied to Figure 5-Figure 7 In any corresponding scene.

[0116] Figure 12This is a schematic diagram of a light extraction structure in a display panel provided in an embodiment of the present application. Figure 13 This is a schematic diagram of a light extraction structure in a display panel provided in an embodiment of the present application. Figure 14 A schematic diagram of a light extraction structure in a display panel provided in an embodiment of the present application.

[0117] like Figure 11-14 As shown, the first sidewall 2110 of the first portion 211 in the light extraction structure 21 is a planar structure, and / or the second sidewall 2120 of the second portion 212 in the light extraction structure 21 is a planar structure.

[0118] like Figure 11-14 As shown, the first side wall 2110 of the first part 211 in the light extraction structure 21 is a curved structure and the first side wall 2110 protrudes in the direction away from the peripheral structure 22, and / or, the second side wall 2120 of the second part 212 in the light extraction structure 21 is a curved structure and the second side wall 2120 protrudes in the direction toward the peripheral structure 22.

[0119] In some embodiments, as Figure 11 As shown, in the first part 211 of the light extraction structure 21, the first side wall 2110 is a curved structure convex in the direction away from the peripheral structure 22; in the second part 212 of the light extraction structure 21, the second side wall 2120 is a curved structure convex in the direction toward the peripheral structure 22.

[0120] In some embodiments, as Figure 12 As shown, in the first portion 211 of the light extraction structure 21 , the first sidewall 2110 is a planar structure; in the second portion 212 of the light extraction structure 21 , the second sidewall 2120 is a planar structure.

[0121] In some embodiments, as Figure 13 As shown, in the first portion 211 of the light extraction structure 21 , the first sidewall 2110 is a curved structure convex in a direction away from the peripheral structure 22 ; in the second portion 212 of the light extraction structure 21 , the second sidewall 2120 is a planar structure.

[0122] In some embodiments, as Figure 14 As shown, in the first portion 211 of the light extraction structure 21 , the first sidewall 2110 is a planar structure; in the second portion 212 of the light extraction structure 21 , the second sidewall 2120 is a curved structure convex toward the peripheral structure 22 .

[0123] In some embodiments, within the same light extraction structure 21, the first sidewall 2110 is tilted less than the second sidewall 2120 relative to the direction of extension of the first axis Z1. The first sidewall 2110 can receive more light emitted by the light-emitting device 30 and incident from the side of the first sidewall 2110. This means the first sidewall 2110 can convert more wide-angle light into light with a narrower angle. The second sidewall 2120 can receive more light that has changed its optical path after passing through the first sidewall 2110 and is incident from below the second sidewall 2120. This means the second sidewall 2120 further corrects the angle of the emitted light.

[0124] Figure 15 A schematic diagram of a light extraction structure in a display panel provided in an embodiment of the present application.

[0125] like Figure 15 As shown, the included angle between the first side wall 2110 and the extending direction of the first axis Z1 is α1, and the included angle between the second side wall 2120 and the extending direction of the first axis Z1 is β1. In the same light extraction structure 21, α1<β1.

[0126] Figure 16 A schematic diagram of a light extraction structure in a display panel provided in an embodiment of the present application.

[0127] like Figure 16 As shown, when the first sidewall 2110 is a curved structure that convexly extends away from the peripheral structure 22, the angle α1 between the first sidewall 2110 and the extension direction of the first axis Z1 may be the minimum angle between a tangent plane of the second sub-sidewall in the first sidewall 2110 and the first axis Z1. The second sub-sidewall is a portion of the first sidewall with a varying curvature.

[0128] like Figure 16 As shown, when the second sidewall 2120 is a curved structure convex toward the peripheral structure 22, the angle β1 between the second sidewall 2120 and the extension direction of the first axis Z1 can be the minimum angle between the tangent plane of the first sub-sidewall in the second sidewall 2120 and the first axis Z1. The first sub-sidewall is the portion of the second sidewall with a changing curvature.

[0129] When the first side wall 2110 and the second side wall 2120 are both curved structures, in the same light extraction structure 21, α1<β1, that is, the minimum angle between the cross-section of the second sub-side wall in the first side wall 2110 and the first axis Z1 is smaller than the minimum angle between the cross-section of the first sub-side wall in the second side wall 2120 and the first axis Z1.

[0130] When the first sidewall 2110 is a curved structure and the second sidewall 2120 is a planar structure, in the same light extraction structure 21, α1<β1, that is, the minimum angle between the first sidewall 2110 and the first axis Z1 is smaller than the angle between the second sidewall 2120 and the first axis Z1.

[0131] When the first side wall 2110 is a planar structure and the second side wall 2120 is a curved structure, in the same light extraction structure 21, α1<β1, that is, the angle between the cross-section of the second sub-side wall in the first side wall 2110 and the first axis Z1 is smaller than the minimum angle between the cross-section of the first sub-side wall in the second side wall 2120 and the first axis Z1.

[0132] In some technical solutions corresponding to this embodiment, 15°≤α1≤45°, that is, the angle between the first side wall 2110 and the first axis Z1 is greater than or equal to 15° and less than or equal to 45°.

[0133] When the first sidewall 2110 is a curved structure convex in a direction away from the peripheral structure 22 , the minimum angle between the tangent plane of the second sub-sidewall in the first sidewall 2110 and the first axis Z1 is greater than or equal to 15° and less than or equal to 45°.

[0134] In some implementations, 35°≤α1≤45°.

[0135] In some technical solutions corresponding to this embodiment, 35°≤β1≤55°, that is, the angle between the second side wall 2120 and the first axis Z1 is greater than or equal to 35° and less than or equal to 55°.

[0136] When the second sidewall 2120 is a curved structure convex toward the peripheral structure 22 , the angle between the tangent plane of the first sub-sidewall in the second sidewall 2120 and the first axis Z1 is greater than or equal to 35° and less than or equal to 55°.

[0137] In some implementations, 45°≤α1≤55°.

[0138] In some embodiments of the present application, Figure 16 As shown, when the first side wall 2110 of the first part 211 and the second side wall 2120 of the second part 212 in the light extraction structure 21 are both curved structures, the curvature of the second sub-side wall in the first side wall 2110 that bulges away from the peripheral structure 22 is smaller than the curvature of the first sub-side wall in the second side wall 2120 that bulges toward the peripheral structure 22.

[0139] If the curvatures at different positions of the first sidewall 2110 are the same and the curvatures at different positions of the second sidewall 2120 are the same, the curvature of the first sidewall 2110 is smaller than the curvature of the second sidewall 2120 .

[0140] Figure 17A schematic diagram of a light extraction structure in a display panel provided in an embodiment of the present application.

[0141] like Figure 17 As shown, in the same light extraction structure 21, the width K1 of the orthographic projection of the first side wall 2110 on the substrate 01 is greater than the width K2 of the orthographic projection of the second side wall 2120 on the substrate 01. In the light extraction structure 21, the first portion 211 closer to the light-emitting device 30 receives more high-angle light relative to the second portion 212. By setting the width of the first side wall 2110 in the first portion 211 to be wider in the direction parallel to the substrate 01, more high-angle light can be captured and converted into low-angle light. By setting the width of the second side wall 2120 in the second portion 212 to be narrower in the direction parallel to the substrate 01, the area of the second portion 212 is smaller, that is, the area of the light extraction structure 21 with a higher refractive index is also smaller, further reducing the light extraction structure 21's reflection of external light.

[0142] Figure 18 A schematic diagram of a light extraction structure in a display panel provided in an embodiment of the present application.

[0143] In some embodiments of the present application, Figure 18 As shown, in the same light extraction structure 21, the distance between the orthographic projection of the first side wall 2110 on the base substrate 01 and the orthographic projection of the second side wall 2120 on the base substrate 01 is greater than 0. That is, along the direction perpendicular to the base substrate 01, the second side wall 2120 and the first side wall 2110 do not overlap.

[0144] Then, of the high-angle light emitted by the light-emitting device 30 and transmitted toward the light-emitting surface of the display panel 001 after being reflected or refracted at the position of the first side wall 2110, the light toward the area where the light-emitting device 30 is located no longer passes through the second side wall 2120, but this portion of light is basically emitted from the light-emitting surface of the display panel 001 at a small angle; while the light transmitted away from the area where the light-emitting device 30 is located can pass through the second side wall 2120 and be converted into low-angle light through refraction at the position of the second side wall 2120. In this embodiment, the second side wall 2120 does not need to capture an excessive amount of light and convert it into low-angle light. Therefore, the extension length of the second side wall 2120 can be designed to be smaller, and the width of the light extraction structure 21 can be designed to be smaller, which is conducive to reducing the reflectivity of the display panel 001.

[0145] In some technical solutions corresponding to this embodiment, such as Figure 18As shown, in at least some of the light extraction structures 21, the distance between the orthographic projection of the first sidewall 2110 and the orthographic projection of the second sidewall 2120 included in the same light extraction structure 21 on the substrate 01 is equal at different positions. It can be understood that in at least some of the light extraction structures 21, the first sidewall 2110 and the second sidewall 2120 included in the same light extraction structure 21 are equidistant in a direction parallel to the substrate 01.

[0146] like Figure 18 As shown, the distance between the orthographic projection of the first side wall 2110 on the base substrate 01 and the orthographic projection of the second side wall 2120 on the base substrate 01 is always a distance d of a certain value, and d>0.

[0147] It should be noted that, in the above and following embodiments, the distance between the orthographic projection of the first side wall 2110 on the substrate substrate 01 and the orthographic projection of the second side wall 2120 on the substrate substrate 01 refers to the distance between the edge of the orthographic projection of the first side wall 2110 on the substrate substrate 01 that is close to the orthographic projection of the second side wall 2120 on the substrate substrate 01 and the edge of the orthographic projection of the second side wall 2120 on the substrate substrate 01 that is close to the orthographic projection of the first side wall 2110 on the substrate substrate 01.

[0148] Figure 19 This is a schematic diagram of a light extraction structure in a display panel provided in an embodiment of the present application. Figure 20 A schematic diagram of a light extraction structure in a display panel provided in an embodiment of the present application.

[0149] In some embodiments of the present application, Figure 19 and Figure 20 As shown, in at least a portion of the light extraction structure 21, the distance between the orthographic projection of the first sidewall 2110 and the orthographic projection of the second sidewall 2120 included in the same light extraction structure 21 on the substrate 01 includes a distance d5 and a distance d6, and d5>d6. That is, in at least a portion of the light extraction structure 21, the first sidewall 2110 and the second sidewall 2120 included in the same light extraction structure 21 are not equidistant in a direction parallel to the substrate 01.

[0150] By setting the widths of the second side wall 2120 protruding from the first side wall 2110 in at least two directions to be different, the amounts of light emitted by the light emitting device 30 in the at least two directions can be different.

[0151] Some technical solutions corresponding to this embodiment, such as Figure 19As shown, in at least part of the light extraction structure 21, the distance between the orthographic projection of the first side wall 2110 included in the same light extraction structure 21 on the substrate substrate 01 and the orthographic projection of the second side wall 2120 included in the same light extraction structure 21 on the substrate substrate 01 is greater than 0, that is, the first side wall 2110 and the second side wall 2120 included in the same light extraction structure 21 have no overlap in the direction perpendicular to the substrate substrate 01, then d5>d6>0.

[0152] Some technical solutions corresponding to this embodiment, such as Figure 20 As shown, in at least part of the light extraction structure 21, a partial distance between the orthographic projection of the first side wall 2110 included in the same light extraction structure 21 on the substrate substrate 01 and the orthographic projection of the second side wall 2120 on the substrate substrate 01 is greater than 0 and a partial distance is less than 0, that is, a partial area of the first side wall 2110 included in the same light extraction structure 21 has no overlap with the second side wall 2120 in the direction perpendicular to the substrate substrate 01 and a partial area of the first side wall 2110 has overlap with the second side wall 2120 in the direction perpendicular to the substrate substrate 01, then d5>0>d6.

[0153] Figure 21 A schematic diagram of a display panel provided in an embodiment of the present application.

[0154] like Figure 21 As shown, the display panel 001 includes a first display area A1 and a second display area A2. The second display area A2 can at least partially surround the first display area A1. The light transmittance of the first display area A1 is greater than that of the second display area A2, that is, the transmittance of the first display area A1 to external light is greater than that of the second display area A2. The area where the first display area A1 is located can be used to accommodate external optical devices, such as optical sensors.

[0155] To achieve a higher light transmittance in the first display area A1, the density of the light-emitting devices 30 disposed in the first display area A1 can be lower than the density of the light-emitting devices 30 disposed in the second display area A2. This results in a difference in the display effects between the first display area A1 and the second display area A2, primarily manifested in that the reflectivity of the first display area A1 to ambient light may be higher than that of the second display area A2, and the luminance of the first display area A1 is lower than that of the second display area A2. This difference in display effects between the first display area A1 and the second display area A2 can be mitigated by designing the light extraction structure 21 provided in any of the above embodiments.

[0156] Figure 22 for Figure 21 Schematic cross-section along the M1-M2 direction.

[0157] In some embodiments, as Figure 22As shown, in the orthographic projection of the first side wall 2110 and the second side wall 2120 included in the light extraction structure 21 arranged in the first display area A1 on the base substrate 01, the distance between the end of the orthographic projection of the first side wall 2110 away from the orthographic projection of the second side wall 2120 and the end of the orthographic projection of the second side wall 2120 away from the orthographic projection of the first side wall 2110 is a first distance W1.

[0158] In these embodiments, Figure 22 As shown, in the orthographic projection of the first side wall 2110 and the second side wall 2120 included in the light extraction structure 21 arranged in the second display area on the base substrate 01, the distance between the end of the orthographic projection of the first side wall 2110 away from the orthographic projection of the second side wall 2120 and the end of the orthographic projection of the second side wall 2120 away from the orthographic projection of the first side wall 2110 is the second distance W2.

[0159] The first distance is less than or equal to the second distance, that is, W1≤W2.

[0160] In this embodiment, the width of the second portion 212 of the light extraction structure 21 set in the first display area A1 protruding from the first portion 211 is smaller than the width of the second portion 212 of the light extraction structure 21 set in the second display area A2 protruding from the first portion 211, which can be understood as the area of the light extraction structure 21 in the first display area A1 is smaller than the area of the light extraction structure 21 in the second display area A2, thereby reducing the difference in reflection of external light between the first display area A1 and the second display area A2; in addition, the smaller width of the second portion 212 protruding from the first portion 211 in the first display area A1 can also increase the light received by the second side wall 2120 from the first side wall 2110, thereby increasing the light extraction effect of the light extraction structure 21 in the first display area A1 and improving the display brightness of the first display area A1.

[0161] Furthermore, the first distance is greater than or equal to 2 μm and less than or equal to 3 μm, and the second distance is greater than or equal to 3 μm and less than or equal to 4 μm, that is, 2 μm≤W1≤3 μm and 3 μm≤W2≤4 μm.

[0162] Figure 23 A schematic diagram of a display panel provided in an embodiment of the present application.

[0163] like Figure 23As shown, the display panel 001 includes a third display area A3 and a fourth display area A4. The curvature of the third display area A3 is greater than that of the fourth display area A4, meaning that the display panel 001 may include a curved display area. The third display area A3 may be located outside the fourth display area A4. By setting the curvature of the third display area A3 to be larger, the non-display area adjacent to the third display area A3 in the display panel 001 can be appropriately concealed. The fourth display area A4 may be a flat display area in the display panel 001.

[0164] When the curvatures of the third display area A3 and the fourth display area A4 of the display panel 001 differ, the angles of light emitted by the light-emitting devices 30 in the third display area A3 and the fourth display area A4 relative to the human eye differ significantly. For example, when the human eye is looking directly at the fourth display area A4, the light emitted by the light-emitting devices 30 in the third display area A3 that reaches the human eye is primarily high-angle light. High-angle light attenuates more during transmission than low-angle light. Therefore, during display, the brightness of the third display area A3 decreases significantly relative to that of the fourth display area A4.

[0165] Figure 24 for Figure 23 Schematic cross-section along the N1-N2 direction.

[0166] like Figure 24 As shown, in the orthographic projections of the first side wall 2110 and the second side wall 2120 included in the light extraction structure 21 arranged in the third display area A3 on the base substrate 01, the minimum distance between the end of the orthographic projection of the first side wall 2110 away from the orthographic projection of the second side wall 2120 and the end of the orthographic projection of the second side wall 2120 away from the orthographic projection of the first side wall 2110 is the third distance W3.

[0167] In the orthographic projections of the first side wall 2110 and the second side wall 2120 included in the light extraction structure 21 arranged in the fourth display area A4 on the base substrate 01, the minimum distance between the end of the orthographic projection of the first side wall 2110 away from the orthographic projection of the second side wall 2120 and the end of the orthographic projection of the second side wall 2120 away from the orthographic projection of the first side wall 2110 is the fourth distance W4.

[0168] The third distance is greater than or equal to the fourth distance, that is, W3≥W4.

[0169] In this embodiment, the second sidewall 2120 of the light extraction structure 21 disposed in the third display area A3 extends to a region further away from the first sidewall 2110. Therefore, the second sidewall 2120 in the third display area A3 can capture relatively less light at large angles. In other words, the light extraction effect of the light extraction structure 21 in the third display area A3 is greater than that of the light extraction structure 21 in the fourth display area A4. Therefore, the display brightness of the third display area A3 is lower than that of the fourth display area A4, and the problem of significant brightness decay with increasing angle in the third display area A3 is alleviated.

[0170] Figure 25 A schematic diagram of a display panel provided in an embodiment of the present application is shown. Figure 26 A schematic diagram of a display panel provided in an embodiment of the present application.

[0171] like Figure 25 and Figure 26 As shown, the display panel 001 further includes a filter layer 05, which includes a color resist 50. Along the thickness of the display panel 001, the filter layer 05 can filter the light emitted by the light-emitting device 30, thereby improving the purity of the emitted light. Furthermore, the filter layer 05 can also filter external light entering the display panel 001, thereby reducing the reflectivity of the display panel 001 to external light.

[0172] The filter layer 05 may further include a black matrix 500 . The black matrix 500 is located between adjacent color resists 50 to prevent crosstalk between lights emitted by adjacent light emitting devices 30 .

[0173] In some embodiments, as Figure 25 As shown, the filter layer 05 is disposed on the side of the light extraction layer 02 away from the base substrate 01, and the orthographic projection of the color resist 50 on the base substrate 01 covers the orthographic projection of the light extraction structure 21 on the base substrate 01. In other words, the color resist 50 is disposed on the side of the light extraction structure 21 facing the light exit surface of the display panel 001 and covers the light extraction structure 21.

[0174] In some embodiments, as Figure 26 As shown, the filter layer 05 is disposed on the side of the light extraction layer 02 close to the base substrate 01, that is, the filter layer 05 is located between the light extraction layer 02 and the light emitting device layer 03. In addition, the orthographic projection of the color resist 50 on the base substrate 01 can cover the orthographic projection of the light extraction structure 21 on the base substrate 01.

[0175] Figure 27 A schematic diagram of a display device provided in an embodiment of the present application.

[0176] like Figure 27As shown, the embodiment of the present application further provides a display device, including a display panel 001 provided in any of the above embodiments. For example, the display device can be an electronic device such as a mobile phone, a computer, a smart wearable device (e.g., a smart watch), and an in-vehicle display device, and the embodiment of the present invention is not limited to this.

[0177] In the embodiment of the present application, since the first sidewall 2110 of the first portion 211 of the light extraction structure 21 is tilted away from the first axis Z1, the high-angle light incident on the first sidewall 2110 will be converted into light with a relatively small angle. However, among the light whose angle becomes relatively small after passing through the first sidewall 2110, there will still be light with a relatively large angle. These light with a relatively large angle will be refracted when passing through the second sidewall 2120 of the second portion 212 of the light extraction structure 21 during the propagation process, forming light with a smaller angle. Therefore, the light extraction structure 21 in the display panel 001 provided in the embodiment of the present application can convert more high-angle light into low-angle light, thereby achieving a better light extraction effect, thereby improving the luminous brightness of the display panel 001.

[0178] The peripheral structure 22 surrounds the light extraction structure 21, and adjacent light extraction structures 21 are not connected. This means that the light extraction structure 21 provided in this embodiment of the present application is an isolated island structure. Since the light extraction structure 21 has a relatively high refractive index, configuring it as an isolated island structure eliminates the presence of structures with a relatively high refractive index between adjacent light extraction structures 21. This reduces reflection of light from the display panel 001 by the high-refractive-index film layer, thereby improving the resolution and display quality of the display panel 001.

[0179] The above description is only a preferred embodiment of the present application and is not intended to limit the present application. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principles of the present application shall be included in the scope of protection of the present application.

Claims

1. A display panel, characterized in that: include: substrate; a light extraction layer, disposed on one side of the base substrate; the light extraction layer comprises a plurality of light extraction structures and a peripheral structure, wherein the peripheral structure surrounds the light extraction structure and has a refractive index lower than that of the light extraction structure; The light extraction structure includes a first portion and a second portion, the second portion is located on a side of the first portion away from the base substrate, and the orthographic projection area of the second portion on the base substrate is larger than the orthographic projection area of the first portion on the base substrate; the first portion includes an inclined first sidewall, and the second portion includes an inclined second sidewall; The first side wall extends in a direction away from a first axis from an end of the first side wall close to the substrate to an end away from the substrate; the second side wall extends in a direction close to the first axis from an end of the second side wall close to the substrate to an end away from the substrate; the first axis is perpendicular to the substrate and passes through the center of the positive projection of the light extraction structure on the substrate.

2. The display panel according to claim 1, wherein: The display panel further includes a light emitting device layer, the light emitting device layer being located between the light extraction layer and the base substrate; the light emitting device layer including a plurality of light emitting devices, and the orthographic projection of the light extraction structure on the base substrate overlaps with the orthographic projection of the light emitting device on the base substrate; In the light emitting device and the light extraction structure whose orthographic projections overlap, an orthographic projection area of the second portion on the base substrate is larger than an orthographic projection area of the light emitting device on the base substrate.

3. The display panel according to claim 2, wherein: An orthographic projection of the second side wall on the base substrate does not overlap with an orthographic projection of the light emitting device on the base substrate.

4. The display panel according to claim 2, wherein: The multiple light extraction structures include a first light extraction structure and a second light extraction structure, and the multiple light emitting devices include a first light emitting device and a second light emitting device; the orthographic projection of the first light extraction structure on the substrate overlaps with the orthographic projection of the first light emitting device on the substrate, and the orthographic projection of the second light extraction structure on the substrate overlaps with the orthographic projection of the second light emitting device on the substrate; The distance between the edge of the orthographic projection of the first light extraction structure on the substrate and the edge of the orthographic projection of the first light emitting device on the substrate is d1, and the distance between the edge of the orthographic projection of the second light extraction structure on the substrate and the edge of the orthographic projection of the second light emitting device on the substrate is d2; Along a direction perpendicular to the substrate, a minimum distance between an end of the second sidewall of the first light extraction structure away from the first portion and an end of the first portion away from the second portion is h1, and a minimum distance between an end of the second sidewall of the second light extraction structure away from the first portion and an end of the first portion away from the second portion is h2; Among them, d1>d2, and h1>h2.

5. The display panel according to claim 2, wherein: The multiple light extraction structures include a third light extraction structure and a fourth light extraction structure, and the multiple light emitting devices include a third light emitting device and a fourth light emitting device; the orthographic projection of the third light extraction structure on the substrate overlaps with the orthographic projection of the third light emitting device on the substrate, and the orthographic projection of the fourth light extraction structure on the substrate overlaps with the orthographic projection of the fourth light emitting device on the substrate; the light emitting area of the third light emitting device is larger than the light emitting area of the fourth light emitting device; In the orthographic projection of the first sidewall and the second sidewall included in the third light extraction structure on the substrate, a distance d3 is between an end of the orthographic projection of the first sidewall away from the orthographic projection of the second sidewall and an end of the orthographic projection of the second sidewall away from the orthographic projection of the first sidewall; In the orthographic projection of the first sidewall and the second sidewall included in the fourth light extraction structure on the substrate, a distance d4 is between an end of the orthographic projection of the first sidewall away from the orthographic projection of the second sidewall and an end of the orthographic projection of the second sidewall away from the orthographic projection of the first sidewall; Among them, d3≤d4.

6. The display panel according to claim 2, wherein: The multiple light extraction structures include a third light extraction structure and a fourth light extraction structure, and the multiple light emitting devices include a third light emitting device and a fourth light emitting device; the orthographic projection of the third light extraction structure on the substrate overlaps with the orthographic projection of the third light emitting device on the substrate, and the orthographic projection of the fourth light extraction structure on the substrate overlaps with the orthographic projection of the fourth light emitting device on the substrate; the light emitting area of the third light emitting device is larger than the light emitting area of the fourth light emitting device; The portion of the second sidewall where the curvature changes is a first sub-sidewall, a minimum angle between a tangent plane of the first sub-sidewall in the second sidewall of the third light extraction structure and the first axis is θ1, and a minimum angle between a tangent plane of the first sub-sidewall in the second sidewall of the fourth light extraction structure and the first axis is θ2; When θ1 is less than a preset value and θ2 is less than a preset value, θ1>θ2; When θ1 is greater than the preset value and θ2 is greater than the preset value, θ1<θ2 。 7. The display panel according to claim 1, wherein: The second portion of at least part of the light extraction structure includes a third sidewall, the third sidewall is located at an end of the second sidewall close to the first sidewall, and the third sidewall is parallel to the first axis.

8. The display panel according to claim 1, wherein: The first side wall is a planar structure, and / or the second side wall is a planar structure.

9. The display panel according to claim 1, wherein: The first sidewall is a curved structure and bulges in a direction away from the peripheral structure, and / or the second sidewall is a curved structure and bulges in a direction toward the peripheral structure.

10. The display panel according to claim 9, wherein: The portion of the second sidewall where the curvature changes is the first sub-sidewall, and the portion of the first sidewall where the curvature changes is the second sub-sidewall; In the same light extraction structure, the maximum curvature of the second sub-sidewall in the first sidewall protruding in a direction away from the peripheral structure is smaller than the maximum curvature of the first sub-sidewall in the second sidewall protruding in a direction toward the peripheral structure.

11. The display panel according to claim 1, wherein The portion of the second sidewall where the curvature changes is the first sub-sidewall, and the portion of the first sidewall where the curvature changes is the second sub-sidewall; In the same light extraction structure, the minimum angle between the second sub-sidewall in the first sidewall and the first axis is smaller than the minimum angle between the first sub-sidewall in the second sidewall and the first axis.

12. The display panel according to claim 11, wherein: An included angle between the second sub-sidewall in the first sidewall and the first axis is greater than or equal to 15° and less than or equal to 45°.

13. The display panel according to claim 11, wherein: An included angle between the first sub-sidewall in the second sidewall and the first axis is greater than or equal to 35° and less than or equal to 55°.

14. The display panel according to claim 1, wherein In the same light extraction structure, the width of the orthographic projection of the first side wall on the base substrate is greater than the width of the orthographic projection of the second side wall on the base substrate.

15. The display panel according to claim 1, wherein In the same light extraction structure, a distance between an orthographic projection of the first side wall on the base substrate and an orthographic projection of the second side wall on the base substrate is greater than 0.

16. The display panel according to claim 1, wherein In at least some of the light extraction structures, a distance between an orthographic projection of the first side wall and an orthographic projection of the second side wall on the substrate included in the same light extraction structure includes a distance d5 and a distance d6; d5>d6.

17. The display panel according to claim 1, wherein: d5>d6>0, or, d5>0>d6.

18. The display panel according to claim 1, wherein The display panel includes a first display area and a second display area, wherein the light transmittance of the first display area is greater than the light transmittance of the second display area; In orthographic projections of the first sidewall and the second sidewall included in the light extraction structure provided in the first display area on the base substrate, a minimum distance between an end of the orthographic projection of the first sidewall farther from the orthographic projection of the second sidewall and an end of the orthographic projection of the second sidewall farther from the orthographic projection of the first sidewall is a first distance; In orthographic projections of the first sidewall and the second sidewall included in the light extraction structure provided in the second display area on the base substrate, a minimum distance between an end of the orthographic projection of the first sidewall farther from the orthographic projection of the second sidewall and an end of the orthographic projection of the second sidewall farther from the orthographic projection of the first sidewall is a second distance; The first distance is less than or equal to the second distance.

19. The display panel according to claim 18, wherein: The first distance is greater than or equal to 2 μm and less than or equal to 3 μm; the second distance is greater than or equal to 3 μm and less than or equal to 4 μm.

20. The display panel according to claim 1, wherein: The display panel includes a third display area and a fourth display area, and the curvature of the third display area is greater than the curvature of the fourth display area; In orthographic projections of the first sidewall and the second sidewall included in the light extraction structure provided in the third display area on the base substrate, a minimum distance between an end of the orthographic projection of the first sidewall farther from the orthographic projection of the second sidewall and an end of the orthographic projection of the second sidewall farther from the orthographic projection of the first sidewall is a third distance; In orthographic projections of the first sidewall and the second sidewall included in the light extraction structure provided in the fourth display area on the base substrate, a minimum distance between an end of the orthographic projection of the first sidewall farther from the orthographic projection of the second sidewall and an end of the orthographic projection of the second sidewall farther from the orthographic projection of the first sidewall is a fourth distance; The third distance is greater than or equal to the fourth distance.

21. The display panel according to claim 1, wherein The display panel further includes a filter layer, which is arranged on a side of the light extraction layer away from the base substrate; The filter layer includes a plurality of color resists, and the orthographic projections of the color resists on the base substrate cover the orthographic projections of the light extraction structure on the base substrate.

22. The display panel according to claim 1, wherein The display panel further includes a filter layer, which is arranged on a side of the light extraction layer close to the base substrate.

23. A display device, characterized in that: Comprising the display panel according to any one of claims 1-22.

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