Display substrate and method for manufacturing the same, and display apparatus

Abstract

To provide a display substrate which can obtain an excellent display effect.SOLUTION: A display substrate comprises a first base, a plurality of light-emitting devices, a light adjusting layer and a second base. The plurality of light-emitting devices are arranged on one side of the first base, and the plurality of light-emitting devices are arranged at intervals. The light adjusting layer is located in gaps between the plurality of light-emitting devices and on the surface of one side, far away from the base, of the plurality of light-emitting devices, so that at least one light-emitting device is surrounded by the light adjusting layer. The material of the light adjusting layer comprises a light absorbing material which is configured to absorb at least a part of light emitted to the light adjusting layer. The second base covers the light adjusting layer.SELECTED DRAWING: Figure 10

Description

[Technical Field]

[0001] This application claims priority from a Chinese patent application filed on March 27, 2020, bearing application number 202010232324.3, the entire contents of which are incorporated herein by reference.

[0002] The present disclosure relates to the field of display technology, and more particularly to a display substrate, a manufacturing method thereof, and a display device. [Background technology]

[0003] Mini Light Emitting Diodes (Mini LEDs) and Micro Light Emitting Diodes (Micro LEDs) have many advantages, such as self-luminous properties, high efficiency, high brightness, high reliability, energy saving, and fast response time, and are therefore used in a wide range of applications, from medium-sized displays such as micro displays, mobile phones, and televisions to large-screen displays such as movie theater screens. Summary of the Invention [Means for solving the problem]

[0004] In one embodiment of the present disclosure, a display substrate is provided, the display substrate including: a first base; a plurality of light-emitting elements provided on one side of the first base and spaced apart from one another; a light adjustment layer surrounding at least one light-emitting element, in gaps between the plurality of light-emitting elements, and on a surface of the plurality of light-emitting elements facing away from the first base, the light adjustment layer being made of a light-absorbing material and configured to absorb at least a portion of light incident on the light adjustment layer; and a second base covering the light adjustment layer, the light adjustment layer including a third sub-light adjustment layer and a first sub-light adjustment layer, the third sub-light adjustment layer being made of a light-reflective material and the first sub-light adjustment layer being made of a light-absorbing material, the first sub-light adjustment layer covering the plurality of light-emitting elements and the third sub-light adjustment layer, and a portion of the first sub-light adjustment layer being located on a surface of the plurality of light-emitting elements facing away from the first base.

[0005] In some embodiments, the light adjustment layer is a second sub-light adjustment layer provided on the side of the first sub-light adjustment layer away from the first base, and the surface of the second sub-light adjustment layer away from the first base is higher than the surface of the first base facing the light-emitting element away from the first base of the plurality of light-emitting elements, and the second sub-light adjustment layer includes a second sub-light adjustment layer that is a transparent thin film. In some embodiments, the refractive index of the second sub-light adjustment layer is greater than the refractive index of the second base.

[0006] In some embodiments, the distance between the surface of the first sub-light adjustment layer remote from the first base and the surface of the first base is 80% to 120% of the thickness of the plurality of light emitting elements.

[0007] In some embodiments, the reflectance of the third sub-light adjusting layer is 70% or more.

[0008] In some embodiments, each light emitting element includes a third base and a light emitting layer disposed on one side of the third base, the light emitting layer being closer to the first base than the third base. In some embodiments, the light adjustment layer is a second sub-light adjustment layer provided on the side of the first sub-light adjustment layer away from the first base, and the surface of the second sub-light adjustment layer away from the first base is higher than the surface of the first base facing the light-emitting element away from the first base of the plurality of light-emitting elements, the second sub-light adjustment layer includes a second sub-light adjustment layer which is a transparent thin film, and the refractive index of the third base is greater than the refractive index of the second sub-light adjustment layer.

[0009] In some embodiments, the material of the first sub-light adjustment layer includes an acrylic adhesive doped with a light-absorbing material, and / or the material of the third sub-light adjustment layer includes an acrylic adhesive doped with a light-reflecting material.

[0010] In some embodiments, the material of the first sub-light adjustment layer includes an acrylic adhesive doped with a light-absorbing material, and the light-absorbing material is carbon black particles, and / or the material of the third sub-light adjustment layer includes an acrylic adhesive doped with a light-reflecting material, and the light-reflecting material is titanium dioxide particles.

[0011] In some embodiments, a surface of the second base facing away from the first base is provided with a plurality of microstructures, the microstructures being arranged to change the propagation direction of at least a portion of light transmitted through the second base from the plurality of light-emitting elements. In some embodiments, the surface shapes of the plurality of microstructures include at least one of a pyramid, a wedge, a curved surface, and a spherical surface. In some embodiments, the second base material is PET.

[0012] In some embodiments, the third sub-light adjusting layer is in direct contact with the first sub-light adjusting layer, and the first sub-light adjusting layer is in direct contact with the second base.

[0013] In some embodiments, a surface of the first sub-light adjusting layer away from the first base is parallel to the first base.

[0014] In some embodiments, a surface of the third sub-light adjustment layer closest to the first base is lower than a surface of the light emitting element farthest from the first base relative to a surface of the first base.

[0015] In some embodiments, the third sub-light adjustment layer has a surface between adjacent light-emitting elements that is lower than the surface of the light-emitting element that is farthest from the first base relative to the surface of the first base.

[0016] In some embodiments, a surface of the third sub-light adjustment layer remote from the first base is higher than surfaces of the plurality of light-emitting elements remote from the first base relative to a surface of the first base.

[0017] In some embodiments, the light emitting element is a Mini LED.

[0018] In another aspect, a display substrate is provided, the display substrate comprising: a first base; a plurality of light-emitting elements provided on one side of the first base and spaced apart from one another; a light adjustment layer surrounding at least one light-emitting element, in gaps between the plurality of light-emitting elements, and on a surface of the plurality of light-emitting elements facing away from the first base; and a second base covering the light adjustment layer, the light adjustment layer including a third sub-light adjustment layer and a first sub-light adjustment layer, the third sub-light adjustment layer being made of an acrylic adhesive doped with titanium dioxide particles, and the first sub-light adjustment layer being made of a light-absorbing material, the first sub-light adjustment layer covering the plurality of light-emitting elements and the third sub-light adjustment layer, a portion of the first sub-light adjustment layer being located on a surface of the plurality of light-emitting elements facing away from the first base, and a surface of the third sub-light adjustment layer facing away from the first base being higher than a surface of the first base facing the light-emitting elements.

[0019] In another aspect, a method for manufacturing a display substrate is provided, the method including: providing a first base and providing a plurality of light-emitting elements spaced apart on one side of the first base; providing a second base and forming a light-adjusting layer on one side of the second base using a light-absorbing material; and compressing the first base on which the plurality of light-emitting elements are formed and the second base on which the light-adjusting layer is formed by a compression process to embed the plurality of light-emitting elements in the light-adjusting layer, with portions of the light-adjusting layer recessed in gaps between the plurality of light-emitting elements and other portions located on surfaces of the plurality of light-emitting elements remote from the first base, wherein the light-adjusting layer includes a third sub-light-adjusting layer and a first sub-light-adjusting layer, the third sub-light-adjusting layer being made of a light-reflective material and the first sub-light-adjusting layer being made of a light-absorbing material, the first sub-light-adjusting layer covering the plurality of light-emitting elements and the third sub-light-adjusting layer, and portions of the first sub-light-adjusting layer being located on surfaces of the plurality of light-emitting elements remote from the first base.

[0020] In some embodiments, the crimping step comprises a vacuum crimping step or a rolling step. [Brief explanation of the drawings]

[0021] In order to more clearly explain the technical solutions of the present disclosure, the following will briefly describe the drawings required for some embodiments of the present disclosure. It is clear that the drawings in the following description are merely drawings of some embodiments of the present disclosure. Those skilled in the art can obtain other drawings from these drawings. In addition, the drawings in the following description can be regarded as schematic diagrams and do not limit the actual dimensions of the products, the actual processes of the methods, etc., according to the embodiments of the present disclosure. [Figure 1] 1A and 1B are schematic diagrams illustrating a method for manufacturing a display substrate according to the related art. [Figure 2] FIG. 1 is a plan view of a display substrate according to some embodiments of the present disclosure. [Figure 3] 3 is a cross-sectional view taken along the line AA' of the display substrate shown in FIG. 2. FIG. [Figure 4] 3 is another cross-sectional view of the display substrate shown in FIG. 2 along the AA' direction. FIG. [Figure 5] 3 is yet another cross-sectional view of the display substrate shown in FIG. 2 along the AA' direction. FIG. [Figure 6] 3 is yet another cross-sectional view of the display substrate shown in FIG. 2 along the AA' direction. FIG. [Figure 7] 3 is yet another cross-sectional view of the display substrate shown in FIG. 2 along the AA' direction. FIG. [Figure 8] 3 is yet another cross-sectional view of the display substrate shown in FIG. 2 along the AA' direction. FIG. [Figure 9] 3 is yet another cross-sectional view of the display substrate shown in FIG. 2 along the AA' direction. FIG. [Figure 10] 3 is yet another cross-sectional view of the display substrate shown in FIG. 2 along the AA' direction. FIG. [Figure 11] 1 is a structural diagram of a Mini LED according to some embodiments of the present disclosure. [Figure 12] 1A and 1B are structural diagrams of a display substrate according to some embodiments of the present disclosure. [Figure 13] 1A and 1B are partial structural diagrams of a display substrate according to some embodiments of the present disclosure. [Figure 14] FIG. 10 is a partial structural diagram of another display substrate according to some embodiments of the present disclosure. [Figure 15] FIG. 10 is a partial structural diagram of yet another display substrate according to some embodiments of the present disclosure. [Figure 16] 1 is a flowchart of a method for manufacturing a display substrate according to some embodiments of the present disclosure. [Figure 17] 1A to 1C are diagrams illustrating a manufacturing procedure for a display substrate according to some embodiments of the present disclosure. [Figure 18] 10A to 10C are diagrams illustrating another manufacturing procedure for a display substrate according to some embodiments of the present disclosure. [Figure 19] 1 is a structural diagram of a display device according to some embodiments of the present disclosure. [Figure 20] 3 is yet another cross-sectional view of the display substrate shown in FIG. 2 along the AA' direction. FIG. [Figure 21] 3 is yet another cross-sectional view of the display substrate shown in FIG. 2 along the AA' direction. FIG. DETAILED DESCRIPTION OF THE INVENTION

[0022] Hereinafter, the technical solutions in some embodiments of the present disclosure will be clearly and completely described with reference to the drawings. Obviously, the described embodiments are only some embodiments of the present disclosure, but not all embodiments. Based on the embodiments provided by the present disclosure, all other embodiments that can be obtained by those skilled in the art shall be included in the claims of the present disclosure.

[0023] Unless the context requires otherwise, throughout this specification and claims, the term "comprise" and other forms thereof, such as the third-person singular "comprises" and the present participle form "comprising," should be construed in an open, inclusive sense, i.e., "including, but not limited to." In the description herein, the terms "one embodiment," "some embodiments," "exemplary embodiments," "example," or "some examples" are intended to indicate that the embodiment, or a particular feature, structure, material, or characteristic associated with the example, is included in at least one embodiment or example of the present disclosure. General references to the above terms do not necessarily refer to the same embodiment or example. Furthermore, a particular described feature, structure, material, or characteristic may be included in any one or more embodiments or examples in any appropriate manner.

[0024] Hereinafter, the terms "first" and "second" are used for descriptive purposes only and should not be understood as expressing or implying relative importance or the number of technical features being presented. Thus, a feature qualified with "first" or "second" may explicitly or implicitly include one or more of that feature. In describing the embodiments of the present disclosure, unless otherwise specified, "plurality" means two or more.

[0025] In describing some embodiments, the term "connected" and its derivatives may be used. For example, in describing some embodiments, the term "connected" may be used to indicate that two or more elements are in direct physical or electrical contact with each other.

[0026] "At least one of A, B, and C" has the same meaning as "at least one of A, B, or C," and all include the following combinations of A, B, and C: A only, B only, C only, a combination of A and B, a combination of A and C, a combination of B and C, and a combination of A, B, and C.

[0027] "A and / or B" includes three combinations: A only, B only, and a combination of A and B.

[0028] The use of "disposed to" herein is intended to be open and inclusive language and does not exclude devices adapted or arranged to perform additional tasks or steps.

[0029] Also, the use of "based on" is meant to be open-ended and inclusive, as a process, step, calculation, or other action performed "based on" one or more stated conditions or values ​​may, in fact, be based on additional conditions or exceed the stated values.

[0030] As used herein, "about" or "approximately" includes the stated value and the mean within an acceptable range of deviation for the particular value, as determined by one of ordinary skill in the art, taking into account, for example, the measurement under consideration and the error associated with measuring the particular quantity (i.e., limitations of the measurement system).

[0031] In this specification, exemplary embodiments are described with reference to cross-sectional views and / or plan views that are ideal exemplary drawings. In the drawings, thicknesses of layers and regions are exaggerated for clarity. Therefore, variations in shape relative to the drawings due to, for example, manufacturing techniques and / or tolerances can be expected. Therefore, exemplary embodiments are not limited to the shapes of regions shown in this disclosure, and should be interpreted as including shape deviations due to manufacturing, etc. For example, etched regions shown as rectangles typically have curved features. Thus, the regions shown in the figures are exemplary in nature, and their shapes are not intended to represent the actual shape of the regions of the device, nor are they intended to limit the scope of the exemplary embodiments.

[0032] In related technologies, Mini LEDs and Micro LEDs can emit light of various colors such as red, green, blue, and yellow. Mini LEDs and Micro LEDs can be applied to display substrates as light-emitting elements to perform display.

[0033] Take a display substrate with multiple Mini LEDs 2' applied, as shown in Figure 1. In the related art, a black paste 3' is generally applied to the gaps between the Mini LEDs 2' and on the surfaces of the Mini LEDs 2', and then polished to a desired thickness by a polishing process. This allows the polished black paste 3' to improve the contrast of the display device. However, due to limitations in the polishing process, the thickness of the black paste 3' on the surfaces of the Mini LEDs 2' can currently only be polished to a thickness of 40 μm to 50 μm.

[0034] If the thickness of the black paste 3' at the portion located on the surface of the Mini LEDs 2' is thicker than the thickness of the Mini LEDs 2', a higher driving voltage will be required to achieve the same brightness on the display substrate as when no black paste is provided, resulting in increased power consumption by the display substrate. Furthermore, if the black paste is made of colloidal silica doped with black particles, the black particles may break down and fall off the colloidal silica during polishing, resulting in an uneven surface on the polished black paste, which may affect the appearance of the display substrate.

[0035] As shown in Fig. 2, some embodiments of the present disclosure provide a display substrate 100. As shown in Figs. 3 to 9, the display substrate 100 includes a first base 1, a plurality of light-emitting elements 2 provided on one side of the first base 1, a light adjustment layer 3, and a second base 4.

[0036] In some examples, as shown in FIGS. 13 and 14, the display substrate 100 has a plurality of sub-pixel regions S arranged in a matrix.

[0037] There are several types of arrangement methods for the plurality of light-emitting elements 2. For example, one light-emitting element 2 is provided in each sub-pixel region S, and in this case, the one light-emitting element 2 is used to display the sub-pixel in the corresponding sub-pixel region S. Alternatively, for example, multiple light-emitting elements 2 are provided in each sub-pixel region S, and are used jointly for display.

[0038] In the following, in some embodiments of the present disclosure, the structure of the display substrate 100 will be roughly described, taking as an example a case where one light-emitting element 2 is provided in each sub-pixel region S.

[0039] 12 and 14, the first base 1 includes a base substrate 11, a plurality of pixel driving circuits, a plurality of gate lines Gate, a plurality of data lines Data, a plurality of electrode lead wires 13, and a plurality of welding pads, where the plurality of welding pads include a plurality of anode welding pads 15 and a plurality of cathode welding pads 14. The plurality of gate lines Gate may extend along a first direction X, and the plurality of data lines Data may extend along a second direction Y, where the first direction X and the second direction Y intersect.

[0040] Here, the type of base substrate 11 may include a plurality of types.

[0041] For example, the base substrate 11 may be a rigid base substrate such as a glass base substrate or a PMMA (Polymethyl methacrylate) base substrate. When the base substrate 11 is a glass base substrate, it is advantageous for improving the precision of wiring (e.g., a plurality of pixel driving circuits and a plurality of electrode lead wires 13) provided on one side thereof.

[0042] As an example, the base substrate 11 may be a flexible base substrate such as a PET (Polymethylene terephthalate) base substrate, a PEN (Polyethylene naphthalate) base substrate, or a PI (Polyimide) base substrate.

[0043] The installation manner of the plurality of pixel driving circuits is related to the installation manner of the light-emitting elements 2. For example, if the plurality of pixel driving circuits are provided on one side of the base substrate 11 and one light-emitting element 2 is provided in each sub-pixel region S, one pixel driving circuit is provided in each sub-pixel region S. Here, the plurality of pixel driving circuits arranged in a row along the first direction X may be electrically connected to one gate line Gate, and the plurality of pixel driving circuits arranged in a row along the second direction Y may be electrically connected to one data line Data.

[0044] Here, the pixel driving circuit structure may include multiple types. For example, the pixel driving circuit structure may include configurations such as "2T1C", "6T1C", "7T1C", "6T2C", and "7T2C". Here, "T" indicates a thin film transistor, the number before "T" indicates the number of thin film transistors, and "C" indicates a storage capacitor. Of the multiple thin film transistors included in the pixel driving circuit of each structure, one thin film transistor is a driving transistor.

[0045] The electrode leads 13 and the pixel driving circuits are located on the same side of the base substrate 11. The installation manner of the electrode leads 13 is related to the installation manner of the light emitting elements 2.

[0046] As an example, each electrode lead wire 13 may be provided in one row of sub-pixel regions S, and the extension direction thereof may be parallel (or approximately parallel) to the extension direction of the sub-pixel regions S of that row (i.e., the first direction X). Alternatively, as shown in Fig. 13, each electrode lead wire 13 may be provided in one column of sub-pixel regions S, and the extension direction thereof may be parallel (or approximately parallel) to the extension direction of the sub-pixel regions S of that column (i.e., the second direction Y). The number of electrode lead wires 13 provided in the sub-pixel regions S of each row or column is the same as the number of light-emitting elements 2 provided in the sub-pixel regions S of that row or column.

[0047] As shown in FIG. 12, the plurality of welding pads are provided on the side of the plurality of pixel driving circuits and the plurality of electrode lead wires 13 that is farther from the base substrate 11.

[0048] The manner in which the plurality of welding pads are installed is related to the manner and structure of the light emitting element 2 .

[0049] For example, each light-emitting element 2 may be a Mini LED or a Micro LED, each of which has two electrode pins (e.g., a cathode electrode pin and an anode electrode pin). In this case, as shown in FIGS. 13 and 14, one cathode welding pad 14 and one anode welding pad 15 may be provided in each subpixel region S. In the same subpixel region S, the anode welding pad 15 may be electrically connected to a pixel driving circuit (e.g., the driving transistor 12 shown in FIG. 12), and the cathode welding pad 14 may be electrically connected to an electrode lead wire 13. In this way, the cathode electrode pin of the light-emitting element 2 can contact the cathode welding pad 14 in the same subpixel region S, and the anode electrode pin can contact the anode welding pad 15 in the same subpixel region S, thereby realizing electrical connection between the light-emitting element 2 and the pixel driving circuit and the electrode lead wire 14.

[0050] The pixel drive circuit is arranged to supply a drive voltage to the light-emitting element 2, and the electrode lead wires 13 are arranged to supply a common voltage to the light-emitting element 2. In this way, the pixel drive circuit and the electrode lead wires 13 work together to control the light-emitting state of the light-emitting element 2, and furthermore, grayscale display can be achieved on the display substrate 100.

[0051] Of course, the embodiment of the present disclosure may use other driving methods in addition to the above driving method for driving the plurality of light-emitting elements 2. For example, the embodiment of the present disclosure may use a passive driving method or an IC (Integrated Circuit) driving method for driving the plurality of light-emitting elements 2.

[0052] 15, the first base 1 may include a base substrate 11, a plurality of integrated circuits 16, a plurality of power supply voltage signal lines Vcc, a plurality of first voltage signal lines VR, a plurality of second voltage signal lines VGB, and a plurality of data lines Data. Here, the plurality of power supply voltage signal lines Vcc may extend along a first direction X, and the plurality of first voltage signal lines VR, the plurality of second voltage signal lines VGB, and the plurality of data lines Data may extend along a second direction Y.

[0053] One integrated circuit 16 may be electrically connected to at least one light-emitting element 2. For example, as shown in Fig. 15, one integrated circuit 16 may be electrically connected to three light-emitting elements 2. The three light-emitting elements 2 may include, for example, one light-emitting element for red light emission, one light-emitting element for green light emission, and one light-emitting element for blue light emission.

[0054] In this case, the anode electrode pin of each red-emitting light-emitting element may be electrically connected to one first voltage signal line VR via an anode welding pad, the anode electrode pin of each green-emitting light-emitting element may be electrically connected to one second voltage signal line VGB via an anode welding pad, and the anode electrode pin of each blue-emitting light-emitting element may be electrically connected to one second voltage signal line VGB via an anode welding pad.

[0055] 15, the integrated circuit 16 may have six pins. Three of the pins may be electrically connected to the cathode electrode pins of the three light-emitting elements 2 in a one-to-one relationship via cathode welding pads. Of the remaining three pins, one pin may be electrically connected to one data line Data, one pin may be electrically connected to one power supply voltage signal line Vcc, and the remaining pin may be grounded.

[0056] 2, the plurality of light-emitting elements 2 are spaced apart from one another, i.e., there are gaps between the plurality of light-emitting elements 2. The gaps between the plurality of light-emitting elements 2 include gaps between any two adjacent light-emitting elements 2 and gaps between any four adjacent light-emitting elements 2. As shown in FIGS. 3 to 9, the light adjustment layer 3 is located in the gaps between the plurality of light-emitting elements 2 and on surfaces of the plurality of light-emitting elements 2 remote from the first base 1 so as to surround at least one light-emitting element 2.

[0057] Here, the light adjustment layer 3 surrounding the at least one light emitting element 2 means that the light adjustment layer 3 is relatively closely attached to the side surface of the at least one light emitting element 2 and the surface remote from the first base 1, and the light adjustment layer 3 relatively completely covers the side surface of the at least one light emitting element 2 and the surface remote from the first base 1. This not only protects the surface of the at least one light emitting element 2 and ensures the quality of the at least one light emitting element 2, but also more stably fixes the at least one light emitting element 2 to the first base 1, preventing the light emitting element 2 from loosening and becoming difficult to electrically connect with the first base 1, and further ensuring a good display effect of the display substrate 100.

[0058] In some examples, the material of light modulating layer 3 comprises a light absorbing material, and light modulating layer 3 is positioned to absorb a portion of the light incident on light modulating layer 3 .

[0059] Here, the light incident on the light adjustment layer 3 includes light incident on the light adjustment layer 3 from the outside and light incident on the light adjustment layer 3 from the plurality of light emitting elements 2 .

[0060] Because the area of ​​the region where external light enters the light adjustment layer 3 is approximately equal to the area of ​​the surface of the light adjustment layer 3 away from the first base 1, almost all of the light that enters the light adjustment layer 3 from the outside can be absorbed by the light adjustment layer 3. As a result, during the process of display on the display substrate 100, the amount of light that enters the display substrate 100 from the outside and is reflected by the first base 1 and / or the plurality of light-emitting elements 2 can be reduced by the light adjustment layer 3. When the display substrate 100 is in a dark state (i.e., a state in which the light-emitting elements are not emitting light), the display surface of the display substrate 100 can be made even darker, and the contrast of the display substrate 100 can be effectively improved.

[0061] When light emitted from the light-emitting element 2 enters the light-adjusting layer 3, the portions of the light-adjusting layer 3 that contain a light-absorbing material absorb the light, while the portions that do not contain a light-absorbing material allow the light to pass smoothly. As a result, since the propagation direction of the light emitted from the light-emitting element 2 is almost arbitrary, the light-adjusting layer 3 absorbs only a portion of the light emitted from the light-emitting element 2, which reduces the absorption of light emitted from the light-emitting element 2 by the light-adjusting layer 3 and is advantageous for reducing the power consumption of the display substrate 100.

[0062] In some embodiments, the second base 4 covers the light adjustment layer 3, as shown in FIGS.

[0063] For example, the second base 4 may be a PET base, which has good plasticity and high transparency, ensuring good light transmittance and reducing or avoiding the loss of light passing through the PET base.

[0064] In this example, the light adjustment layer 3 is formed on one side of the second base 4, and the second base 4 on which the light adjustment layer 3 is formed is pressed onto the first base 1 on which the plurality of light emitting elements 2 are formed, for example, by a pressing process. This not only avoids polishing the light adjustment layer 3 and makes the surface of the light adjustment layer 3 away from the first base 1 flat, compared to the conventional technology, but also protects the light adjustment layer 3 with the second base 4, prevents damage to the surface of the light adjustment layer 3 away from the first base 1, and makes the surface of the display substrate 100 relatively uniform.

[0065] As described above, the display substrate 100 according to some embodiments of the present disclosure includes a light adjustment layer 3 provided in the gaps between the plurality of light-emitting elements 2 and on the surfaces of the plurality of light-emitting elements 2 remote from the first base 1, and a second base 4 covering the side of the light adjustment layer 3 remote from the first base 1. This not only protects the plurality of light-emitting elements 2 with the light adjustment layer 3 and the second base 4 with the light adjustment layer 3, but also allows the light adjustment layer 3 to absorb a portion of the light incident on the light adjustment layer 3, thereby improving the contrast of the display substrate 100 and reducing the power consumption of the display substrate 100. Furthermore, the second base 4 on which the light adjustment layer 3 is formed is bonded to the first base 1 on which the plurality of light-emitting elements 2 are formed, for example, by a bonding process. This avoids the need to polish the light adjustment layer 3 compared to conventional techniques, thereby omitting a process and improving the uniformity of the surface of the display substrate 100.

[0066] In some embodiments of the present disclosure, there are multiple types of structures for the light adjustment layer 3, and the type of structure of the light adjustment layer 3 used in the display substrate 100 can be selected and set according to actual needs. The structure of the light adjustment layer 3 will be schematically described below.

[0067] In some embodiments, as shown in FIG. 4, the light adjustment layer 3 includes a first sub-light adjustment layer 31 located in the gap between the plurality of light-emitting elements 2, and a second sub-light adjustment layer 32 provided on the side of the first sub-light adjustment layer 31 away from the first base 1.

[0068] In some examples, there are several types of positional relationships between the first sub-light adjustment layer 31 and the plurality of light-emitting elements 2, which are related to the structures of the plurality of light-emitting elements 2.

[0069] As an example, the plurality of light-emitting elements 2 include Mini LEDs. The positional relationship between the first sub-light adjustment layer 31 and the plurality of light-emitting elements 2 is such that the plurality of light-emitting elements 2 are provided on the surface of the first base 1 with respect to the surface of the first base 1, and the surface of the first sub-light adjustment layer 31 away from the first base 1 is at the same level as the surfaces of the plurality of light-emitting elements 2 away from the first base 1, or is lower than the surfaces of the plurality of light-emitting elements 2 away from the first base 1, as shown in FIG. 4 . In this case, the first sub-light adjustment layer 31 is all located in the gaps between the plurality of light-emitting elements 2, i.e., the first sub-light adjustment layer 31 covers at least a portion of the side surfaces of the plurality of light-emitting elements 2.

[0070] Here, since all of the first sub-light adjustment layers 31 are located in the gaps between the plurality of light-emitting elements 2, the distance between the surface of the first sub-light adjustment layer 31 farthest from the first base 1 and the surface of the first base 1 is the thickness of the first sub-light adjustment layer 31. The thickness of the first sub-light adjustment layer 31 may be 80% to 100% of the thickness of the plurality of light-emitting elements 2 (i.e., the dimension of the plurality of light-emitting elements 2 in the thickness direction of the first base 1). For example, if the thickness of the plurality of light-emitting elements 2 is 100 μm, the thickness of the first sub-light adjustment layer 31 may be 80 μm to 100 μm. For example, if the thickness of the plurality of light-emitting elements 2 is 150 μm, the thickness of the first sub-light adjustment layer 31 may be 120 μm to 150 μm. The specific thickness of the first sub-light adjustment layer 31 can be selected and set according to actual needs.

[0071] For example, the plurality of light-emitting elements 2 include Mini LEDs or Micro LEDs. 20 , the positional relationship between the first sub-light adjustment layer 31 and the plurality of light-emitting elements 2 may be such that the surface of the first sub-light adjustment layer 31 away from the first base 1 is higher than the surfaces of the plurality of light-emitting elements 2 away from the first base 1. In this case, part of the first sub-light adjustment layer 31 is located in the gaps between the plurality of light-emitting elements 2, and other parts are located on the surfaces of the plurality of light-emitting elements 2 away from the first base 1, i.e., the first sub-light adjustment layer 31 covers the exposed surfaces of the plurality of light-emitting elements 2 (including the side surfaces of the plurality of light-emitting elements 2 and the surfaces away from the first base 1).

[0072] Here, the distance between the surface of the first sub-light adjustment layer 31 away from the first base 1 and the surface of the first base 1 may be greater than the thickness of the multiple light-emitting elements 2 and may be less than 120% of the thickness of the multiple light-emitting elements 2.

[0073] For example, the plurality of light-emitting elements 2 include micro LEDs. The thickness of the micro LEDs is generally small, for example, 10 μm or less. Considering the manufacturing process of the first sub-light adjusting layer 31, if the thickness of the first sub-light adjusting layer 31 is thin, the manufactured thickness of the first sub-light adjusting layer 31 may be approximately 10 μm. Thus, the surface of the first sub-light adjusting layer 31 away from the first base 1 is higher than the surfaces of the plurality of light-emitting elements 2 away from the first base 1 relative to the surface of the first base 1. For example, if the thickness of the light-emitting element 2 is 10 μm, the distance between the surface of the first sub-light adjusting layer 31 away from the first base 1 and the surface of the first base 1 may be greater than 10 μm and less than 12 μm. The specific thickness of the first sub-light adjusting layer 31 can be selected and set according to actual needs.

[0074] In addition, the first sub-light adjustment layer 31 also covers the exposed portions of the first base 1 that are exposed from the gaps between the multiple light-emitting elements 2. If there is a strong adhesive force between the first sub-light adjustment layer 31 and the first base 1, the first sub-light adjustment layer 31 can improve the connectivity between the multiple light-emitting elements 2 and the first base 1, and can more firmly fix the multiple light-emitting elements 2 to the first base 1.

[0075] In some examples, the material of the first sub-light adjustment layer 31 includes a light absorbing material, and the first sub-light adjustment layer 31 is arranged to absorb at least a portion of light incident on the first sub-light adjustment layer 31. This allows the first sub-light adjustment layer 31 to absorb light incident on the first sub-light adjustment layer 31 from the outside, thereby reducing or preventing the light from being reflected by the first base 1 and / or the plurality of light-emitting elements 2. When the display substrate 100 is in a dark state (i.e., when the light-emitting elements 2 are not emitting light), the display surface of the display substrate 100 can be made even darker, which is advantageous for improving the contrast of the display substrate 100.

[0076] Furthermore, when the surface of the first sub-light adjustment layer 31 away from the first base 1 is higher than the surfaces of the multiple light-emitting elements 2 away from the first base 1 relative to the surface of the first base 1, the distance between the surface of the first sub-light adjustment layer 31 away from the first base 1 and the surface of the first base 1 is at most 120% of the thickness of the light-emitting element 2, which means that the thickness of the portion of the first sub-light adjustment layer 31 on the surface of the multiple light-emitting elements 2 away from the first base 1 can be significantly reduced compared to conventional technology, thereby reducing the absorption of light emitted from the multiple light-emitting elements 2 by the first sub-light adjustment layer 31 and reducing the power consumption of the display substrate 100.

[0077] 4 , the surface of the second sub-light adjustment layer 32 included in the light adjustment layer 3 that is distant from the first base 1 is higher than the surfaces of the plurality of light-emitting elements 2 that are distant from the first base 1, relative to the surface of the first base 1, and the second sub-light adjustment layer 32 is also located on the surfaces of the plurality of light-emitting elements 2 that are distant from the surface of the first base 1. That is, a portion of the second sub-light adjustment layer 32 is located between the plurality of light-emitting elements 2 and the second base 4. In this way, when the light adjustment layer 3 and the second base 4 are formed on the first base 1 having the plurality of light-emitting elements 2 using, for example, a pressure bonding process, the portion of the second sub-light adjustment layer 32 that is located between the plurality of light-emitting elements 2 and the second base 4 protects the plurality of light-emitting elements 2 and prevents damage to the plurality of light-emitting elements 2 during pressure bonding.

[0078] Here, the thickness of the second sub-light adjustment layer 32 is related to the positional relationship between the first sub-light adjustment layer 31 and the plurality of light-emitting elements 2.

[0079] For example, when the surface of the first sub-light adjusting layer 31 remote from the first base 1 is at the same level as the surfaces of the light-emitting elements 2 remote from the first base 1 or is higher than the surfaces of the light-emitting elements 2 remote from the first base 1, the surface of the second sub-light adjusting layer 32 closer to the first base 1 is relatively flat, thereby making the thickness of each portion of the second sub-light adjusting layer 32 relatively uniform. The thickness of the second sub-light adjusting layer 32 can be selected and set according to actual needs. For example, the thickness of the second sub-light adjusting layer 32 may be in the range of 50 μm to 100 μm, or may be in the range of 10 μm to 40 μm.

[0080] 4, when the surface of the first sub-light adjustment layer 31 away from the first base 1 is lower than the surfaces of the light-emitting elements 2 away from the first base 1 relative to the surface of the first base 1, the surface of the second sub-light adjustment layer 32 closer to the first base 1 has an uneven shape. In this case, the second sub-light adjustment layer 32 includes a first portion 321 whose orthogonal projection onto the first base overlaps with the orthogonal projection of the light-emitting elements 2 onto the first base 1, and a second portion 322 whose orthogonal projection onto the first base overlaps with the orthogonal projection of the first sub-light adjustment layer 31 onto the first base 1. The thickness of the first portion 321 may be in the range of 20 μm to 100 μm. The thickness of the second portion 322 is in the range of 50 μm to 100 μm.

[0081] Of course, the thickness range of the first portion 321 and the thickness range of the second portion 322 may be other numerical ranges, and can be selected and set according to actual needs.

[0082] In some examples, the second sub-light adjustment layer 32 is a transparent thin film with high light transmittance (for example, the light transmittance may be 90% or more). The light emitted from the plurality of light-emitting elements 2 can smoothly pass through the second sub-light adjustment layer 32 and be emitted to the outside, so that the second sub-light adjustment layer 32 can be prevented from adversely affecting the propagation of the light emitted from the plurality of light-emitting elements 2.

[0083] In some examples, the refractive index of the second sub-light adjusting layer 32 is greater than the refractive index of the second base 4. As an example, the refractive index of the second sub-light adjusting layer 32 may be about 1.5, for example, 1.49, 1.5, 1.51, or 1.52; the refractive index of the second base 4 may be about 1.4, for example, 1.39, 1.4, 1.41, or 1.42.

[0084] Since the refractive index of light in the outside air is approximately 1.0, the refractive index of the second sub-light adjustment layer 32 and the refractive index of the second base 4 are set so that the refractive index of the second sub-light adjustment layer 32 is greater than the refractive index of the second base 4, thereby allowing the light emitted from the plurality of light-emitting elements 2 to be gradually emitted from the light-tight medium to the light-opaque medium during the process of emitting to the outside. This allows the emission of the light emitted from the plurality of light-emitting elements 2 to be guided, and reduces or avoids the occurrence of total reflection, compared to when the light emitted from the plurality of light-emitting elements 2 is emitted directly into the outside air.

[0085] 6 , the light adjusting layer 3 further includes a third sub-light adjusting layer 33 in addition to the first sub-light adjusting layer 31 and the second sub-light adjusting layer 32. The third sub-light adjusting layer 33 is located in the gaps between the plurality of light-emitting elements 2 and is provided between the first sub-light adjusting layer 31 and the first base 1. That is, the third sub-light adjusting layer 33, the first sub-light adjusting layer 31, and the second sub-light adjusting layer 32 are sequentially stacked along the thickness direction of the first base 1.

[0086] In some examples, the positional relationship between the third sub-light adjusting layer 33 and the plurality of light-emitting elements 2 is such that the surface of the third sub-light adjusting layer 33 away from the first base 1 is at the same level as the surfaces of the plurality of light-emitting elements 2 away from the first base 1, or is lower than the surfaces of the plurality of light-emitting elements 2 away from the first base 1, as shown in Figure 6. The third sub-light adjusting layer 33 is all located in the gaps between the plurality of light-emitting elements 2, i.e., the third sub-light adjusting layer 33 covers at least a portion of the side surfaces of the plurality of light-emitting elements 2.

[0087] In some examples, the material of the third sub-light adjustment layer 33 includes a light-reflecting material, and the third sub-light adjustment layer 33 is arranged to reflect light incident on the third sub-light adjustment layer 33 from the plurality of light-emitting elements 2 back to the plurality of light-emitting elements 2. As a result, when light emitted from the plurality of light-emitting elements 2 is incident on the side surfaces of the plurality of light-emitting elements 2 covered by the third sub-light adjustment layer 33, at least one reflection occurs due to the action of the third sub-light adjustment layer 33, and as a result, the reflected light can be emitted to the outside from the surfaces of the plurality of light-emitting elements 2 away from the first base 1, which improves the utilization efficiency of the light emitted from the plurality of light-emitting elements 2, increases the optical efficiency of the display substrate 100, and is advantageous for reducing the power consumption of the display substrate 100.

[0088] By having the third sub-light adjustment layer 33 cover only a portion of the side surfaces of the plurality of light-emitting elements 2, it is ensured that the light emitted from the plurality of light-emitting elements 2 can be reliably emitted from the surface of the plurality of light-emitting elements 2 that is away from the first base 1, and it is possible to prevent the light from being reflected back into the plurality of light-emitting elements 2 after irradiating the surface of the plurality of light-emitting elements 2 that is away from the first base 1, making it difficult for the light to be emitted to the outside.

[0089] In some examples, the reflectance of the third sub-light adjustment layer 33 is 70% or more, which ensures that the third sub-light adjustment layer 33 has a good reflecting effect on the light emitted from each light-emitting element 2 and incident on the third sub-light adjustment layer 33, thereby ensuring high light efficiency and low power consumption of the display substrate 100. As an example, the reflectance of the third sub-light adjustment layer 33 may be 70%, 80%, 90%, or 95%, etc.

[0090] Here, when the light adjustment layer 3 further includes a third sub-light adjustment layer 33, the positional relationship between the first sub-light adjustment layer 31 and the plurality of light-emitting elements 2 is such that the surface of the first sub-light adjustment layer 31 away from the first base 1 is at the same level as the surfaces of the plurality of light-emitting elements 2 away from the first base 1, or is higher or lower than the surfaces of the plurality of light-emitting elements 2 away from the first base 1, relative to the surface of the first base 1. For example, the distance between the surface of the first sub-light adjustment layer 31 away from the first base 1 and the surface of the first base 1 is 80% to 120% of the thickness of the plurality of light-emitting elements 2. For other explanations regarding the first sub-light adjustment layer 31 and the second sub-light adjustment layer 32, please refer to the explanations of the first sub-light adjustment layer 31 and the second sub-light adjustment layer 32 in the above examples, and therefore, the explanations thereof will be omitted here.

[0091] 5 , the light adjustment layer 3 may include a third sub-light adjustment layer 33 and a first sub-light adjustment layer 31. Here, the material of the third sub-light adjustment layer 33 includes a light-reflecting material, and the third sub-light adjustment layer 33 is arranged to reflect light incident on the third sub-light adjustment layer 33 from the plurality of light-emitting elements 2 back to the plurality of light-emitting elements 2. The material of the first sub-light adjustment layer 31 includes a light-absorbing material, and the first sub-light adjustment layer 31 is arranged to absorb at least a portion of the light incident on the first sub-light adjustment layer 31.

[0092] 5 , the third sub-light adjusting layer 33 is located in the gaps between the plurality of light-emitting elements 2. Relative to the surface of the first base 1, the surface of the third sub-light adjusting layer 33 away from the first base 1 is at the same level as the surfaces of the plurality of light-emitting elements 2 away from the first base 1, or is lower than the surfaces of the plurality of light-emitting elements 2 away from the first base 1. In this case, all of the third sub-light adjusting layers 33 are located in the gaps between the plurality of light-emitting elements 2, i.e., the third sub-light adjusting layer 33 covers at least a portion of the side surfaces of the plurality of light-emitting elements 2.

[0093] 5 , the first sub-light adjusting layer 31 is provided on the side of the third sub-light adjusting layer 33 away from the first base 1, and on the surfaces of the plurality of light-emitting elements 2 away from the first base 1. Relative to the surface of the first base 1, the surface of the first sub-light adjusting layer 31 away from the first base 1 is higher than the surfaces of the plurality of light-emitting elements 2 away from the first base 1. That is, the first sub-light adjustment layer 31 covers the multiple light-emitting elements 2 and the third sub-light adjustment layer 33 regardless of the positional relationship between the surface of the third sub-light adjustment layer 33 away from the first base 1 and the surfaces of the multiple light-emitting elements 2 away from the first base 1, and a portion of the first sub-light adjustment layer 31 is located on the surfaces of the multiple light-emitting elements 2 away from the first base 1 so as to protect the multiple light-emitting elements 2.

[0094] By providing the third sub-light adjustment layer 33 and the first sub-light adjustment layer 31, the cooperative action between the third sub-light adjustment layer 33 and the first sub-light adjustment layer 31 can improve the utilization efficiency of light emitted from the multiple light-emitting elements 2 by the third sub-light adjustment layer 33, increase the light efficiency of the display substrate 100, reduce the power consumption of the display substrate 100, and improve the contrast of the display substrate 100 by the first sub-light adjustment layer 31.

[0095] Furthermore, in the process of manufacturing the light adjustment layer 3, by adjusting the thickness of the first sub-light adjustment layer 31, the thickness of the portion of the first sub-light adjustment layer 31 located on the surface away from the first base 1 of the multiple light-emitting elements 2 can be adjusted (for example, the thickness can be set to 10 μm).This allows the first sub-light adjustment layer 31 to be used to improve the contrast of the display substrate 100, and to reduce the absorption by the first sub-light adjustment layer 31 of light emitted from the multiple light-emitting elements 2, thereby reducing the power consumption of the display substrate 100.

[0096] Here, for other explanations regarding the third sub-light adjustment layer 33 and the first sub-light adjustment layer 31, you may refer to the explanations of the third sub-light adjustment layer 33 and the first sub-light adjustment layer 31 in some of the above-mentioned embodiments, so the explanations will be omitted here.

[0097] In some of the above embodiments, the material of each sub-layer included in the light adjustment layer 3 includes a plurality of types.

[0098] In some examples, when the light adjustment layer 3 includes the first sub-light adjustment layer 31, the material of the first sub-light adjustment layer 31 includes an acrylic adhesive doped with a light absorbing material. The light absorbing material may include, for example, carbon black particles.

[0099] In some examples, when the light adjustment layer 3 includes the second sub-light adjustment layer 32, the material of the second sub-light adjustment layer 32 includes an acrylic adhesive.

[0100] In some examples, when the light adjustment layer 3 includes the third sub-light adjustment layer 33, the material of the third sub-light adjustment layer 33 includes an acrylic adhesive doped with a light-reflecting material. The light-reflecting material may include, for example, titanium dioxide particles.

[0101] The above-mentioned acrylic adhesive has advantages such as being colorless and transparent, having high light transmittance (for example, light transmittance may be 90% or more), and good adhesive strength, which can impart good adhesion between each sub-layer in the light adjustment layer 3, and can impart good adhesion between the light adjustment layer 3 and the first base 1, each light-emitting element 2, and the second base 4, thereby improving the connectivity between each light-emitting element 2 and the first base 1 and preventing the second base 4 and the light adjustment layer 3 from falling off.

[0102] 7, each of the plurality of light-emitting elements 2 included in the display substrate 100 includes a third base 22 and a light-emitting layer 21 disposed on one side of the third base 22. The light-emitting layer 21 is closer to the first base 1 than the third base 22.

[0103] Hereinafter, as shown in FIG. 11, the structure of the light-emitting element 2 will be described schematically, taking as an example a case where the light-emitting element 2 is a Mini LED.

[0104] As shown in FIG. 11, the Mini LED includes a third base 22, an N-type semiconductor layer 23, a light-emitting layer 21, a P-type semiconductor layer 24, a current blocking layer 25, a conductive layer 26, a Bragg reflector layer 27, a cathode electrode pin 28 connected to the N-type semiconductor layer 23, and an anode electrode pin 29 connected to the conductive layer 26, which are stacked in sequence.

[0105] When the structure of the Mini LED shown in Figure 11 is applied to the structure of the display substrate 100 shown in Figure 12, the cathode electrode pin 28 may be connected to the electrode lead wire 13 via the cathode welding pad 14, and the anode electrode pin 29 may be connected to the driving transistor 12 via the anode welding pad 15.

[0106] In this embodiment, the light emitting layers 21 are capable of emitting light, and the light emitted from each light emitting layer 21 can be transmitted through the third base 22, the light adjustment layer 3, and the second base 4 in sequence and emitted to the outside.

[0107] In some examples, when the light adjustment layer 3 includes a second sub-light adjustment layer 32, the refractive index of the third base 22 is greater than the refractive index of the second sub-light adjustment layer 32, and the refractive index of the second sub-light adjustment layer 32 is greater than the refractive index of the second base 4.

[0108] The refractive index of the second sub-light adjustment layer 32 is greater than the refractive index of the second base 4, which in turn is greater than the refractive index of the outside air. Therefore, by making the refractive index of the third base 22 greater than the refractive index of the second sub-light adjustment layer 32, the refractive index of each medium through which the light emitted from the light-emitting layer 21 passes can be gradually lowered at a constant gradient in the process of the light being emitted to the outside. This makes it possible to guide the emission of the light emitted from the plurality of light-emitting elements 2, reduce or avoid the occurrence of total reflection, and increase the light efficiency, compared to when the light emitted from the plurality of light-emitting elements 2 is directly emitted to the outside air.

[0109] As an example, the material of the third base 22 may include a sapphire material, and the refractive index of the third base 22 may be about 1.77. For example, the refractive index may be 1.76, 1.77, or 1.78.

[0110] 21 , when the light adjustment layer 3 includes a third sub-light adjustment layer 33, the positional relationship between the surface of the third sub-light adjustment layer 33 remote from the first base 1 and the plurality of light-emitting elements 2 may further include that the surface of the third sub-light adjustment layer 33 remote from the first base 1 is higher than the surfaces of the plurality of light-emitting elements 2 remote from the first base 1, relative to the surface of the first base 1. This ensures that almost all of the light emitted from the plurality of light-emitting elements 2 and incident on the third sub-light adjustment layer 33 is reflected back to the light-emitting element 2, and prevents the reflected light from entering an adjacent light-emitting element 2 and causing color mixing.

[0111] In some embodiments, as shown in FIG. 12 , the display substrate 100 further includes a reflective layer 5 disposed in the gap between the cathode welding pad 14 and the anode welding pad 15, the reflective layer 5 being located closer to the first base 1 of the plurality of light-emitting elements 2.

[0112] By providing the reflective layer 5 on the side of the plurality of light-emitting elements 2 closer to the first base 1, the reflective layer 5 can be used to reflect light incident on the reflective layer 5 back into the plurality of light-emitting elements 2, and the light can be emitted to the outside from the surface of the plurality of light-emitting elements 2 farther from the first base 1. This improves the utilization efficiency of the light emitted from the plurality of light-emitting elements 2, increases the optical efficiency of the display substrate 100, and is advantageous for reducing the power consumption of the display substrate 100.

[0113] As an example, the material of the reflective layer 5 may be a white ink with high reflectivity.

[0114] In some embodiments, the surface of the second base 4 remote from the first base 1 may be a flat surface. Of course, as shown in Figures 8 and 9, the surface of the second base 4 remote from the first base 1 may be provided with a plurality of microstructures 41. The plurality of microstructures 41 are arranged to change the propagation direction of at least a portion of the light transmitted through the second base 4 from the plurality of light-emitting elements 2.

[0115] Here, the shape of the plurality of microstructures 41 is related to the change in the propagation direction of at least a part of the light transmitted through the second base 4.

[0116] 8, the surface shape of the plurality of microstructures 41 that does not contact the second base 4 includes at least one of a pyramid and a wedge. The tip of the pyramid or the wedge points to one side of the pyramid or the wedge that is away from the second base 4. In this case, the plurality of microstructures 41 can collect at least a portion of the light that is transmitted through the second base 4 from the plurality of light-emitting elements 2, which is advantageous for improving the display brightness of the display substrate 100.

[0117] Here, the dimensions of the microstructure 41 can be selected and set according to actual needs. As an example, the height of the microstructure 41 (i.e., the dimension of the microstructure 41 in the thickness direction of the first base 1) may be about 12 μm, and the width of the microstructure 41 (i.e., the dimension of the surface of the microstructure 41 that contacts the second base 4 in the direction perpendicular to the thickness direction of the first base 1 shown in FIG. 9) may be about 24 μm. For example, the height of the microstructure 41 may be 11 μm, 12 μm, 13 μm, etc., and the width of the microstructure 41 may be 23 μm, 24 μm, 25 μm, etc.

[0118] 9, the surface shape of the plurality of microstructures 41 that is not in contact with the second base 4 includes at least one of a curved surface and a spherical surface. In this case, the plurality of microstructures 41 can diffuse at least a portion of the light that is emitted from the plurality of light-emitting elements 2 and transmitted through the second base 4, thereby improving the uniformity of the light emitted from the display substrate 100 and preventing glare from occurring on the display surface of the display substrate 100.

[0119] Here, the dimensions of the microstructure 41 can be selected and set according to actual needs. As an example, the diameter of the microstructure 41 (i.e., the dimension of the surface of the microstructure 41 in contact with the second base 4 in a direction perpendicular to the thickness direction of the first base 1) may be 20 μm to 30 μm, and the height of the microstructure 41 (i.e., the dimension of the microstructure 41 in the thickness direction of the first base 1) may be about 10 μm. For example, the diameter of the microstructure 41 may be 20 μm, 23 μm, 27 μm, or 30 μm, etc., and the height of the microstructure 41 may be 9 μm, 10 μm, or 11 μm, etc.

[0120] In some examples, the plurality of microstructures 41 are integral with the second base 4. This is advantageous for simplifying the structure of the display substrate 100.

[0121] As an example, the surface of the second base 4 to be formed, which is far from the first base 1, may be etched by an etching process to form the plurality of microstructures 41 and the second base 4. Since the second base 4 has a certain hardness, the structure of the plurality of microstructures 41 formed by the etching process is very stable, and deformation of the plurality of microstructures 41 can be avoided.

[0122] In some embodiments, the display substrate 100 can also be used in a liquid crystal display device as a light source for a backlight module of the liquid crystal display device.

[0123] 10 , the light adjustment layer 3 may include a third sub-light adjustment layer 33 located in the gaps between the plurality of light-emitting elements 2 and a second sub-light adjustment layer 32 provided on a side of the third sub-light adjustment layer 33 away from the first base 1. Here, with respect to the surface of the first base 1, the surface of the third sub-light adjustment layer 33 away from the first base 1 is lower than the surfaces of the light-emitting layers 21 of the plurality of light-emitting elements 2 away from the first base 1; and the surface of the second sub-light adjustment layer 32 away from the first base 1 is higher than the surfaces of the plurality of light-emitting elements 2 away from the first base 1. In this way, the third sub-light adjustment layer 33 is used to totally reflect light emitted from all directions of the plurality of light-emitting elements 2, and the second sub-light adjustment layer 32 and the second base 4 are used to guide the light, thereby avoiding the total reflection phenomenon and effectively improving the brightness that can be displayed on the display substrate 100.

[0124] In addition, the display substrate 100 further includes quantum dot thin films disposed on the second base 4 away from the first base 1 and located in each of the sub-pixel regions. For example, the light-emitting elements 2 all emit blue light, and the blue light is converted into multiple colors of light, such as red light or green light, after passing through the quantum dot thin films in the sub-pixel regions.

[0125] Some embodiments of the present disclosure provide a method for manufacturing a display substrate, which includes steps S100 to S300, as shown in FIG.

[0126] In S100, as shown in (a) and (b) of FIG. 17 and (a) and (b) of FIG. 18, a first base 1 is provided, and a plurality of light-emitting elements 2 are provided on one side of the first base 1 at intervals.

[0127] In some embodiments, the plurality of light-emitting elements 2 may include Mini LEDs or Micro LEDs. When the plurality of light-emitting elements 2 are provided on one side of the first base 1, the plurality of light-emitting elements 2 may be transferred to one side of the first base 1 using, for example, mass transfer technology.

[0128] Here, the structure of the first base 1, the structure of the plurality of light-emitting elements 2, and the connection between the first base 1 and the plurality of light-emitting elements 2 can be referred to in the explanations of some of the above examples, so the explanations will be omitted here.

[0129] In S200, as shown in Fig. 17(c) and Fig. 18(c), a second base 4 is provided, and a light adjustment layer 3 is formed on one side of the second base 4. The material of the portion of the light adjustment layer 3 located in the gaps between the plurality of light-emitting elements 2 includes a light-absorbing material.

[0130] As an example, the second base 4 may be a PET base, that is, the second base 4 may be a thin film structure made of PET.

[0131] In some examples, forming the light adjustment layer 3 on one side of the second base 4 includes applying a material for forming the light adjustment layer 3 to one side of the second base 4 and curing it to form the light adjustment layer 3.

[0132] In some examples, as shown in (c) of FIG. 17 and (c) of FIG. 18, the light adjustment layer 3 includes a first sub-light adjustment layer 31 and a second sub-light adjustment layer 32 that are stacked one on top of the other.

[0133] In this case, forming the light adjustment layer 3 on one side of the second base 4 may include, for example, applying a material for forming the second sub-light adjustment layer 32 to one side of the second base 4 and hardening it to form the second sub-light adjustment layer 32, applying a material for forming the first sub-light adjustment layer 31 to another thin film (e.g., a release film) and hardening it to form the first sub-light adjustment layer 31, and then bonding the first sub-light adjustment layer 31 and the second sub-light adjustment layer 32 together and removing the thin film bonded to one side of the first sub-light adjustment layer 31, thereby obtaining the light adjustment layer 3 formed on one side of the second base 4.

[0134] In S300, as shown in (d) and (e) of Figure 17 and (d) and (e) of Figure 18, a first base 1 on which the plurality of light-emitting elements 2 are formed and a second base 4 on which a light-adjusting layer 3 is formed are pressure-bonded by a pressure-bonding process, so that the plurality of light-emitting elements 2 are embedded in the light-adjusting layer 3, and part of the light-adjusting layer 3 is recessed into the gaps between the plurality of light-emitting elements 2, and the other part is positioned on the surface of the plurality of light-emitting elements 2 away from the first base 1.

[0135] In some examples, the material of the light adjustment layer 3 further includes an acrylic adhesive in addition to the light absorbing material.

[0136] Acrylic adhesives have the advantage of curing at room temperature or medium temperature. Therefore, when forming the light adjustment layer 3 on one side of the second base 4 in S200, the material forming the light adjustment layer 3 can be cured at room temperature or medium temperature. This eliminates the need for a separate curing operation, which is advantageous in simplifying the manufacturing process of the display substrate 100 and reducing the manufacturing cost of the display substrate 100.

[0137] Since acrylic adhesive has a certain elasticity and the ability to fill steps, during the process of pressing the first base 1 on which the plurality of light-emitting elements 2 are formed and the second base 4 on which the light-adjusting layer 3 is formed, the plurality of light-emitting elements 2 can gradually penetrate into the light-adjusting layer 3 until they are completely embedded inside the light-adjusting layer 3; part of the light-adjusting layer 3 can fill the gaps between the plurality of light-emitting elements 2 until the gaps between the plurality of light-emitting elements 2 are filled.

[0138] The other part of the light adjustment layer 3 is located on the surface of the plurality of light-emitting elements 2 away from the first base 1, i.e., between the plurality of light-emitting elements 2 and the second base 4, so that the other part of the light adjustment layer 3 can protect the plurality of light-emitting elements 2 and prevent the second base 4 from coming into direct contact with the plurality of light-emitting elements 2 and damaging the light-emitting elements 2.

[0139] In a manufacturing method of a display substrate 100 according to some embodiments of the present disclosure, a light adjustment layer 3 is formed on one side of a second base 4, and a first base 1 having a plurality of light emitting elements 2 formed thereon and a second base 4 having the light adjustment layer 3 formed thereon are pressed together by a compression process to embed the plurality of light emitting elements 2 in the light adjustment layer 3, with a portion of the light adjustment layer 3 recessed in the gaps between the plurality of light emitting elements 2 and another portion located on a surface of the plurality of light emitting elements 2 away from the first base 1. This allows the light adjustment layer 3 to absorb a portion of light incident on the light adjustment layer 3, thereby improving the contrast of the display substrate 100 and preventing an increase in power consumption of the display substrate 100. Furthermore, compared to the prior art, the manufacturing method of a display substrate 100 according to some embodiments of the present disclosure has simpler processes and is easier to operate, and avoids polishing the light adjustment layer 3, thereby preventing whitening of the surface of the display substrate 100 and improving the uniformity of the surface of the display substrate 100.

[0140] In some embodiments, the type of crimping process includes multiple types.

[0141] As an example, the crimping step may include a vacuum crimping step.

[0142] 17(d), in the process of using a vacuum pressure bonding process to pressure bond the first base 1 on which the plurality of light-emitting elements 2 is formed and the second base 4 on which the light adjustment layer 3 is formed, the entire second base 4 on which the light adjustment layer 3 is formed can be pressure bonded to the first base 1 on which the plurality of light-emitting elements 2 is formed while performing a vacuum drawing operation. This allows the surface of the light adjustment layer 3 that is closest to the plurality of light-emitting elements 2 to come into contact with the plurality of light-emitting elements 2 at approximately the same time, allowing the plurality of light-emitting elements 2 to enter the light adjustment layer 3 at approximately the same time and be embedded within the light adjustment layer 3. Furthermore, the generation of air bubbles between the light adjustment layer 3 and the first base 1 can be avoided.

[0143] As an example, the crimping step may include a rolling step.

[0144] 18(d), in the rolling process for pressing the first base 1 on which the plurality of light-emitting elements 2 are formed and the second base 4 on which the light adjustment layer 3 is formed, first, one end of the first base 1 on which the plurality of light-emitting elements 2 are formed (e.g., the right end shown in FIG. 18) and one end of the second base 4 on which the light adjustment layer 3 is formed (e.g., the right end shown in FIG. 18) are pressed together to completely embed the light-emitting elements 2 at that end in the light adjustment layer 3. Then, the pressing position may be gradually moved to the other end on the opposite side of the first base 1 (e.g., the left end shown in FIG. 18) to sequentially embed the plurality of light-emitting elements 2 in the light adjustment layer 3 from one end of the first base 1 toward the other end on the opposite side, and then a temperature-raising defoaming operation may be performed. This may reduce or eliminate air bubbles that may occur between the light adjustment layer 3 and the first base 1.

[0145] In some embodiments, when the light adjusting layer 3 includes multiple sub-layers, the hardness of the sub-layer closer to the multiple light emitting elements 2 is less than the hardness of the sub-layer farther from the multiple light emitting elements 2 .

[0146] For example, the light adjustment layer 3 includes a first sub-light adjustment layer 31 and a second sub-light adjustment layer 32 that are stacked one on top of the other. In this case, the hardness of the first sub-light adjustment layer 31 is lower than the hardness of the second sub-light adjustment layer 32. This makes it easier to embed the light emitting elements 2 into the first sub-light adjustment layer 31 during the process of pressing the first base 1, on which the light emitting elements 2 are formed, to the second base 4, on which the light adjustment layer 3 is formed. If the surface of the first sub-light adjustment layer 31 away from the first base 1 is lower than the surface of the light emitting elements 2 away from the first base 1 relative to the surface of the first base 1, the rate at which the light emitting elements 2 penetrate into the second sub-light adjustment layer 32 can be slowed down and easily controlled. This prevents the light emitting elements 2 from penetrating the second sub-light adjustment layer 32 and coming into contact with the second base 2, thereby preventing damage to the light emitting elements 2.

[0147] In addition, in some embodiments of the present disclosure, the speed at which the plurality of light-emitting elements 2 penetrate into the light-adjusting layer 3 can be controlled by controlling the thickness of the second sub-light-adjusting layer 32 .

[0148] Some embodiments of the present disclosure provide a display device 200. As shown in Fig. 19, the display device 200 includes, for example, the display substrate 100 provided in some of the above embodiments.

[0149] The display substrate 100 included in the display device 200 has the same structure and provides the same effects as the display substrate 100 provided in the above embodiments, and therefore, a description thereof will be omitted here.

[0150] In some examples, the display device 200 further includes a housing for mounting the display substrate 100 and / or a camera or the like mounted on the display substrate 100. In some embodiments, the display device 200 is any product or component with a display function, such as an electronic paper, a mobile phone, a tablet, a television, a display, a laptop, a digital photo frame, a navigation system, and the like.

[0151] The above description is merely a specific embodiment of the present disclosure, and the scope of protection of the present disclosure is not limited thereto. Any modifications or substitutions that a person skilled in the art can conceive within the technical scope of the present disclosure are all included in the scope of protection of the present disclosure. Therefore, the scope of protection of the present disclosure should be determined by the scope of protection of the claims.

Claims

1. A display substrate, The first base and a plurality of light emitting elements disposed on one side of the first base and spaced apart from one another; a light adjustment layer located in gaps between the plurality of light emitting elements and on surfaces of the plurality of light emitting elements away from the first base so as to surround at least one light emitting element, the light adjustment layer being made of a material including a light absorbing material and being arranged to absorb at least a portion of light incident on the light adjustment layer; a second base covering the light adjustment layer, the light adjusting layer includes a third sub-light adjusting layer and a first sub-light adjusting layer, the material of the third sub-light adjusting layer includes a light reflecting material, the material of the first sub-light adjusting layer includes a light absorbing material, the first sub-light adjusting layer covers the plurality of light emitting elements and the third sub-light adjusting layer, and a portion of the first sub-light adjusting layer is located on a surface of the plurality of light emitting elements away from the first base; Display board.

2. The light adjustment layer is a second sub-light adjustment layer provided on a side of the first sub-light adjustment layer away from the first base, wherein a surface of the second sub-light adjustment layer away from the first base is higher than a surface of the first base facing the light-emitting element, the surface being higher than surfaces of the plurality of light-emitting elements away from the first base, and the second sub-light adjustment layer is a transparent thin film; The display substrate according to claim 1 .

3. The refractive index of the second sub-light adjustment layer is greater than the refractive index of the second base. The display substrate according to claim 2 .

4. a distance between a surface of the first sub-light adjustment layer away from the first base and the surface of the first base is 80% to 120% of a thickness of the plurality of light-emitting elements; The display substrate according to claim 2 .

5. The reflectance of the third sub-light adjustment layer is 70% or more. The display substrate according to claim 1 .

6. Each light-emitting element is The third base and a light emitting layer provided on one side of the third base, the light emitting layer being closer to the first base than the third base; The display substrate according to claim 1 .

7. The light adjustment layer is a second sub-light adjustment layer provided on a side of the first sub-light adjustment layer away from the first base, wherein a surface of the second sub-light adjustment layer away from the first base is higher than a surface of the first base facing the light-emitting element, the surface being higher than surfaces of the plurality of light-emitting elements away from the first base, the second sub-light adjustment layer being a transparent thin film; the refractive index of the third base is greater than the refractive index of the second sub-light adjustment layer; The display substrate according to claim 6 .

8. the material of the first sub-light adjustment layer includes an acrylic adhesive doped with a light absorbing material; and / or the material of the third sub-light adjustment layer includes an acrylic adhesive doped with a light-reflecting material; The display substrate according to claim 1 .

9. the material of the first sub-light adjustment layer includes an acrylic adhesive doped with a light absorbing material, and the light absorbing material is carbon black particles; and / or the material of the third sub-light adjustment layer includes an acrylic adhesive doped with a light-reflecting material, and the light-reflecting material is titanium dioxide particles; The display substrate according to claim 1 .

10. a surface of the second base remote from the first base having a plurality of microstructures; the plurality of microstructures are arranged to change a propagation direction of at least a portion of light from the plurality of light emitting elements that is transmitted through the second base. The display substrate according to claim 1 .

11. the surface shapes of the plurality of microstructures include at least one of a pyramid, a wedge, a curved surface, and a spherical surface; The display substrate according to claim 10.

12. the second base material is PET; The display substrate according to claim 1 .

13. the third sub-light adjusting layer is in direct contact with the first sub-light adjusting layer, and the first sub-light adjusting layer is in direct contact with the second base; The display substrate according to claim 1 .

14. a surface of the first sub-light adjustment layer away from the first base is parallel to the first base; The display substrate according to claim 1 .

15. a surface of the third sub-light adjustment layer closest to the first base is lower than a surface of the light emitting element farthest from the first base, The display substrate according to any one of claims 1 to 14.

16. With respect to the surface of the first base, the third sub-light adjustment layer has a surface between adjacent light emitting elements that is lower than a surface of the light emitting element that is farthest from the first base. The display substrate according to claim 15 .

17. a surface of the third sub-light adjustment layer away from the first base is higher than surfaces of the plurality of light-emitting elements away from the first base relative to a surface of the first base; The display substrate according to any one of claims 1 to 14.

18. The light-emitting element is a mini LED. The display substrate according to claim 1 .

19. A display substrate, The first base and a plurality of light emitting elements disposed on one side of the first base and spaced apart from one another; a light adjustment layer positioned in gaps between the plurality of light emitting elements and on surfaces of the plurality of light emitting elements away from the first base so as to surround at least one light emitting element; a second base covering the light adjustment layer, the light adjusting layer includes a third sub-light adjusting layer and a first sub-light adjusting layer, the material of the third sub-light adjusting layer includes an acrylic adhesive doped with titanium dioxide particles, the material of the first sub-light adjusting layer includes a light absorbing material, the first sub-light adjusting layer covers the plurality of light emitting elements and the third sub-light adjusting layer, and a portion of the first sub-light adjusting layer is located on a surface of the plurality of light emitting elements away from the first base; a surface of the third sub-light adjustment layer away from the first base is higher than a surface of the first base facing the light emitting element, and a surface of the third sub-light adjustment layer away from the first base is higher than surfaces of the plurality of light emitting elements away from the first base; Display board.

20. A method for manufacturing a display substrate, providing a first base, and providing a plurality of light emitting elements spaced apart from one another on one side of the first base; providing a second base, and forming a light adjustment layer on one side of the second base using a light absorbing material; a pressure-bonding step of compressing a first base on which the plurality of light-emitting elements are formed and a second base on which the light adjustment layer is formed, so that the plurality of light-emitting elements are embedded in the light adjustment layer, and a portion of the light adjustment layer is recessed into the gaps between the plurality of light-emitting elements, and another portion is positioned on a surface of the plurality of light-emitting elements away from the first base, the light adjusting layer includes a third sub-light adjusting layer and a first sub-light adjusting layer, the material of the third sub-light adjusting layer includes a light reflecting material, the material of the first sub-light adjusting layer includes a light absorbing material, the first sub-light adjusting layer covers the plurality of light emitting elements and the third sub-light adjusting layer, and a portion of the first sub-light adjusting layer is located on a surface of the plurality of light emitting elements away from the first base; A method for manufacturing a display substrate.

21. The method for manufacturing a display substrate according to claim 20 , wherein the pressure-bonding step includes a vacuum pressure-bonding step or a rolling step.

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