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

Abstract

The display substrate includes a first base, a plurality of light-emitting elements, a light adjustment layer, and a second base. The plurality of light-emitting elements are provided on one side of the first base, and the plurality of light-emitting elements are spaced apart from one another. The light adjustment layer is located in the gaps between the plurality of light-emitting elements and on the surfaces of the plurality of light-emitting elements away from the base, surrounding at least one light-emitting element. The material of the light adjustment layer includes a light-absorbing material, and the light adjustment layer is arranged to absorb at least a portion of light incident on the light adjustment layer. The second base covers the light adjustment layer.

Description

Technical Field

[0001] This application claims priority based on a Chinese patent application with an application number of 202010232324.3 filed on March 27, 2020, and all of its contents are incorporated herein by reference.

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

Background Art

[0003] Mini Light Emitting Diodes (abbreviated as Mini LED) and Micro Light Emitting Diodes (abbreviated as Micro LED) have many advantages such as self-emission, high efficiency, high brightness, high reliability, energy saving, and high response speed, and thus are applied from micro displays, medium-sized displays such as mobile phones and televisions to large-screen display fields such as movie theater screens.

Summary of the Invention

Means for Solving the Problems

[0004] In one aspect of this disclosure, a display substrate is provided. The display substrate includes a first base, a plurality of light-emitting elements, a light adjustment layer, and a second base. The plurality of light-emitting elements are provided on one side of the first base, and the plurality of light-emitting elements are provided at intervals from each other. The light adjustment layer is located within the gaps between the plurality of light-emitting elements and on the surface of the plurality of light-emitting elements on the side away from the first base so as to surround at least one light-emitting element. The material of the light adjustment layer includes a light absorption material, and the light adjustment layer is arranged to absorb at least a part of the light incident on the light adjustment layer. The second base covers the light adjustment layer.

[0005] In some embodiments, the light-modulating layer includes a first sub-light-modulating layer and a second sub-light-modulating layer. The first sub-light-modulating layer is located in the gaps between the plurality of light-emitting elements. With respect to the first base, the surface of the first sub-light-modulating layer away from the first base is at the same level as, or higher than, the surface of the plurality of light-emitting elements away from the first base, or lower than the surface of the plurality of light-emitting elements away from the first base. The material of the first sub-light-modulating layer includes a light-absorbing material, and the first sub-light-modulating layer is arranged to absorb at least a portion of the light incident on it. The second sub-light-modulating layer is provided on the side of the first sub-light-modulating layer away from the first base. With respect to the first base, the surface of the second sub-light-modulating layer away from the first base is higher than the surface of the plurality of light-emitting elements away from the first base. The second sub-light-modulating layer is a transparent thin film.

[0006] In some embodiments, if the surface of the first sub-light-tuning layer away from the first base is lower than the surface of the plurality of light-emitting elements away from the first base, the second sub-light-tuning layer includes a first portion and a second portion. The orthographic projection of the first portion onto the first base coincides with the orthographic projection of the plurality of light-emitting elements onto the first base, and the orthographic projection of the second portion onto the first base coincides with the orthographic projection of the first sub-light-tuning layer onto the first base. The thickness range of the first portion is 20 μm to 100 μm. The thickness range of the second portion is 50 μm to 100 μm.

[0007] In some embodiments, the refractive index of the second sub-photo-adjusting layer is greater than that of the second base.

[0008] In some embodiments, the distance between the surface of the first sub-light-adjusting layer away from the first base and the first base is 80% to 120% of the thickness of the plurality of light-emitting elements.

[0009] In some embodiments, the light-modulating layer further includes a third sub-light-modulating layer located in the gaps between the plurality of light-emitting elements and provided between the first sub-light-modulating layer and the first base. With respect to the first base, the surface of the third sub-light-modulating layer away from the first base is at the same level as the surface of the plurality of light-emitting elements away from the first base, or is lower than the surface of the plurality of light-emitting elements away from the first base. The material of the third sub-light-modulating layer includes a light-reflective material, and the third sub-light-modulating layer is arranged to reflect back light incident on the third sub-light-modulating layer from the plurality of light-emitting elements to the plurality of light-emitting elements.

[0010] In some embodiments, the light-modulating layer includes a first sub-light-modulating layer and a third sub-light-modulating layer. The third sub-light-modulating layer is located in the gaps between the plurality of light-emitting elements. With respect to the first base, the surface of the third sub-light-modulating layer away from the first base is at the same level as the surface of the plurality of light-emitting elements away from the first base, or lower than the surface of the plurality of light-emitting elements away from the first base. The material of the third sub-light-modulating layer includes a light-reflective material, and the third sub-light-modulating layer is arranged to reflect back light incident on the third sub-light-modulating layer from the plurality of light-emitting elements. The first sub-light-modulating layer is provided on the side of the third sub-light-modulating layer away from the first base. With respect to the first base, the surface of the first sub-light-modulating layer away from the first base is higher than the surface of the plurality of light-emitting elements away from the first base. The material of the first sub-light-modulating layer includes a light-absorbing material, and the first sub-light-modulating layer is arranged to absorb at least a portion of the light incident on the first sub-light-modulating layer.

[0011] In some embodiments, the reflectance of the third sub-light adjustment layer is 70% or more.

[0012] In some embodiments, each light-emitting element includes a third base and a light-emitting layer provided on one side of the third base. The light-emitting layer is closer to the first base than to the third base.

[0013] In some embodiments, when the light-modulating layer includes a second sub-light-modulating layer, the refractive index of the third base is greater than the refractive index of the second sub-light-modulating layer.

[0014] In some embodiments, when the light-modulating layer includes a third sub-light-modulating layer, the surface of the third sub-light-modulating layer away from the first base is higher than the surface of the plurality of light-emitting elements away from the first base.

[0015] In some embodiments, if the light-modulating layer includes the first sub-light-modulating layer, the material of the first sub-light-modulating layer includes an acrylic adhesive doped with a light-absorbing material. If the light-modulating layer includes the second sub-light-modulating layer, the material of the second sub-light-modulating layer includes an acrylic adhesive. If the light-modulating layer includes the third sub-light-modulating layer, the material of the third sub-light-modulating layer includes an acrylic adhesive doped with a light-reflecting material.

[0016] In some embodiments, a plurality of microstructures are provided on the surface of the second base, away from the first base. The plurality of microstructures are arranged to change the propagation direction of at least a portion of the light transmitted from the plurality of light-emitting elements through the second base.

[0017] In some embodiments, the surface shape of the plurality of microstructures includes at least one of a pyramid, a wedge, a curved surface, and a sphere.

[0018] In another embodiment, a method for manufacturing a display substrate is provided. The method for manufacturing the display substrate includes providing a first base and providing a plurality of light-emitting elements spaced apart from each other 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 pressing 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 pressing step, embedding the plurality of light-emitting elements in the light-adjusting layer, and positioning a part of the light-adjusting layer in the gaps between the plurality of light-emitting elements and the other part on the surface of the plurality of light-emitting elements away from the first base.

[0019] In some embodiments, the crimping step includes a vacuum crimping step or a rolling step.

[0020] In yet another embodiment, a display device is provided. The display device includes a display substrate as described in any of the above embodiments. [Brief explanation of the drawing]

[0021] To more clearly explain the technical concepts of this disclosure, the following is a brief description of the drawings required for some embodiments of this disclosure. It is clear that the drawings in the following description are only drawings of some embodiments of this disclosure. Those skilled in the art can obtain other drawings from these. Furthermore, the drawings in the following description can be considered schematic diagrams and do not limit the actual dimensions of the products, the actual processes of the methods, etc., relating to the embodiments of this disclosure. [Figure 1] This is a method for manufacturing a display board using related technologies. [Figure 2] This is a plan view of a display substrate according to several embodiments of the present disclosure. [Figure 3] Figure 2 is a cross-sectional view of the display board along the A-A' direction. [Figure 4] This is another cross-sectional view of the display board shown in Figure 2, along the A-A' direction. [Figure 5] This is yet another cross-sectional view of the display board shown in Figure 2, along the A-A' direction. [Figure 6] It is yet another cross-sectional view along the A-A' direction of the display substrate shown in FIG. 2. [Figure 7] It is yet another cross-sectional view along the A-A' direction of the display substrate shown in FIG. 2. [Figure 8] It is yet another cross-sectional view along the A-A' direction of the display substrate shown in FIG. 2. [Figure 9] It is yet another cross-sectional view along the A-A' direction of the display substrate shown in FIG. 2. [Figure 10] It is yet another cross-sectional view along the A-A' direction of the display substrate shown in FIG. 2. [Figure 11] It is a structural diagram of a Mini LED according to some embodiments of the present disclosure. [Figure 12] It is a structural diagram of a display substrate according to some embodiments of the present disclosure. [Figure 13] It is a partial structural diagram of a display substrate according to some embodiments of the present disclosure. [Figure 14] It is a partial structural diagram of another display substrate according to some embodiments of the present disclosure. [Figure 15] It is a partial structural diagram of yet another display substrate according to some embodiments of the present disclosure. [Figure 16] It is a flowchart of a manufacturing method of a display substrate according to some embodiments of the present disclosure. [Figure 17] It is a manufacturing procedure diagram of a display substrate according to some embodiments of the present disclosure. [Figure 18] It is a manufacturing procedure diagram of another display substrate according to some embodiments of the present disclosure. [Figure 19] It is a structural diagram of a display device according to some embodiments of the present disclosure.

Embodiments for Carrying Out the Invention

[0022] The technical concepts in several embodiments of this disclosure will be clearly and completely described below with reference to the drawings. Clearly, the embodiments described are only a selection of embodiments of this disclosure, not all embodiments. All other embodiments that can be obtained by those skilled in the art based on the embodiments provided by this disclosure are included in the claims of this disclosure.

[0023] Unless otherwise required by context, throughout this specification and the claims, the term “comprise” and other forms, such as the third-person singular “comprises” and the present participle “comprising,” should be interpreted as having an open, inclusive meaning, i.e., “including, but not limited to.” In this specification, terms such as “one embodiment,” “some embodiments,” “exemplary embodiments,” “example,” or “some examples” are intended to indicate that a particular feature, structure, material, or property associated with that embodiment or example is included in at least one embodiment or example of this disclosure. The general expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, any particular feature, structure, material, or property described may be included in any one or more embodiments or examples in any suitable manner.

[0024] In the following, the terms “first” and “second” are used solely for descriptive purposes and should not be understood as expressing or implying relative importance or the number of technical features being described. Therefore, features limited by “first” and “second” may include one or more such features, expressly or implicitly. In the description of the embodiments of this disclosure, unless otherwise specified, “multiple” means two or more.

[0025] The term "connection" and related expressions may be used when describing certain embodiments. For example, the term "connection" may be used when describing certain embodiments to indicate that two or more components have direct physical or electrical contact with one another.

[0026] "At least one of A, B, and C" has the same meaning as "at least one of A, B, or C," and both 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] In this specification, the use of “arranged to…” means open and inclusive language and does not exclude devices applied or arranged to perform additional tasks or steps.

[0029] Furthermore, the use of “based on” implies that a process, step, calculation, or other action performed “based on” one or more stated conditions or values ​​is open and inclusive, as it may actually be based on additional conditions or exceed the stated values.

[0030] As used herein, “about” or “approximate” includes the stated value and the mean value within an acceptable range of deviation of the particular value, as determined by a person skilled in the art, taking into account, for example, the measurement under consideration and the error associated with the measurement of the particular quantity (i.e., the limits of the measurement system).

[0031] In this specification, exemplary embodiments are described with reference to cross-sectional and / or plan views, which are ideal illustrative drawings. In the drawings, the thickness of layers and regions is exaggerated for clarity. Therefore, variations in shape from the drawings may be expected, for example, due to manufacturing techniques and / or tolerances. Accordingly, exemplary embodiments should be interpreted as including manufacturing-related shape deviations, etc., and not being limited to the shapes of the regions shown in this disclosure. For example, an etching region shown as a rectangle typically has curved characteristics. Therefore, the regions shown in the drawings are essentially illustrative, and their shapes are not intended to represent the actual shapes of the regions in the apparatus, 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, including red, green, blue, and yellow. Mini LEDs and Micro LEDs can be used as pixels on display boards to display information.

[0033] As shown in Figure 1, let's take a display board with multiple Mini LEDs as an example. In related technologies, black paste is generally applied to the gaps between the multiple Mini LEDs and to the surfaces of the multiple Mini LEDs, and the black paste is polished in a polishing process to achieve a desired thickness in the portion of the black paste that is located on the surface of the multiple Mini LEDs. This makes it possible to improve the contrast of the display device with the polished black paste. However, due to limitations in the polishing process, currently it is only possible to polish the portion of the black paste located on the surface of the multiple Mini LEDs to a thickness of 40 μm to 50 μm.

[0034] If the thickness of the black paste is greater than the thickness of the Mini LED, a higher driving voltage will be required to display the same brightness as without the black paste, thus increasing the power consumption of the display board. Also, if the material of the black paste is colloidal silica doped with black particles, there is a possibility that the black particles may break off and fall off from the colloidal silica during the polishing process. This can result in an uneven surface on the black paste after polishing, potentially affecting the appearance of the display board.

[0035] As shown in Figure 2, a display substrate 100 is provided in several embodiments of the present disclosure. As shown in Figures 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-adjusting layer 3, and a second base 4.

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

[0037] There are several ways in which the above-mentioned multiple light-emitting elements 2 can be installed. For example, one light-emitting element 2 can be provided in each sub-pixel region S, in which case the single light-emitting element 2 is used to display the sub-pixels in the corresponding sub-pixel region S. Alternatively, for example, multiple light-emitting elements 2 can be provided in each sub-pixel region S and used together for display.

[0038] In the following, the structure of the display substrate 100 will be described in general terms, with the example of a case in which one light-emitting element 2 is provided in each sub-pixel region S of the present disclosure.

[0039] In some examples, as shown in Figure 12, 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. Here, 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, and the first direction X and the second direction Y intersect.

[0040] Here, the base board 11 may include multiple 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 1 is a glass base substrate, it is advantageous for improving the precision of the wiring (for example, multiple pixel driving circuits and multiple 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 arrangement of the multiple pixel driving circuits described above is related to the arrangement of the light-emitting element 2. For example, if the multiple 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, then each of the multiple pixel driving circuits is located within the multiple sub-pixel regions S. Here, the multiple pixel driving circuits arranged in a line along the first direction X may be electrically connected to a single gate line Gate, and the multiple pixel driving circuits arranged in a line along the second direction Y may be electrically connected to a single data line Data.

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

[0045] The multiple electrode lead wires 13 are located on the same side as the multiple pixel driving circuits and the base substrate 11. The method of installing the multiple electrode lead wires 13 is related to the method of installing the light-emitting element 2.

[0046] For example, each electrode lead wire 13 may be provided within a row of subpixel regions S, and its extending direction may be parallel (or approximately parallel) to the extending direction of the subpixel region S of that row (i.e., the first direction X). Alternatively, as shown in Figures 13 and 14, each electrode lead wire 13 may be provided within a column of subpixel regions S, and its extending direction may be parallel (or approximately parallel) to the extending direction of the subpixel region S of that column (i.e., the first direction Y). In other words, the number of electrode lead wires 13 provided within each row or column of subpixel region S is the same as the number of light-emitting elements 2 provided within that row or column of subpixel region S.

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

[0048] The installation method for the multiple welding pads is related to the installation method and structure of the light-emitting element 2.

[0049] As an example, each light-emitting element 2 may be a Mini LED or a Micro LED, and both Mini LEDs and Micro LEDs have two electrode pins (e.g., a cathode electrode pin and an anode electrode pin). In this case, as shown in Figures 13 and 14, one cathode welding pad 14 and one anode welding pad 15 may be provided within each sub-pixel region S. Within the same sub-pixel region S, the anode welding pad 15 may be electrically connected to a pixel driving circuit (e.g., a driving transistor 12 shown in Figure 12), and the cathode welding pad 14 may be electrically connected to an electrode lead wire 13. This allows the cathode electrode pin of the light-emitting element 2 to be inserted into the cathode welding pad 14 within the same sub-pixel region S, and the anode electrode pin to be inserted into the anode welding pad 15 within the same sub-pixel region S, thereby enabling electrical connection between the light-emitting element 2 and the pixel driving circuit and electrode lead wire 14.

[0050] Here, the pixel driving circuit is arranged to supply a driving voltage to the light-emitting element 2, and the electrode lead wire 13 is arranged to supply a common voltage to the light-emitting element 2. As a result, the light-emitting state of the light-emitting element 2 can be controlled through the cooperation of the pixel driving circuit and the electrode lead wire 13, and furthermore, grayscale display can be realized on the display board 100.

[0051] Of course, the embodiments of this disclosure may utilize other driving methods besides the above-described driving method for driving the multiple light-emitting elements 2. For example, the embodiments of this disclosure may drive the multiple light-emitting elements 2 using a passive driving method or an IC (Integrated Circuit) driving method.

[0052] As an example, as shown in Figure 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, a plurality of second voltage signal lines VGB, and a 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 Figure 15, one driver chip 81 may be electrically connected to three light-emitting elements 2. These three light-emitting elements 2 may include, for example, one red light-emitting element, one green light-emitting element, and one blue light-emitting element.

[0054] In this case, the anode electrode pins of each red light-emitting element may be electrically connected to a first voltage signal line VR via an anode welding pad 15, the anode electrode pins of each green light-emitting element may be electrically connected to a second voltage signal line VGB via an anode welding pad 11, and the anode electrode pins of each blue light-emitting element may be electrically connected to a second voltage signal line VGB via an anode welding pad.

[0055] As an example, as shown in Figure 15, the integrated circuit 16 may have six pins. Three of these pins may be electrically connected one-to-one with the cathode electrode pins of three light-emitting elements 2 via cathode welding pads 14. Alternatively, one of the other three pins may be electrically connected to a data line Data, one to a power supply voltage signal line Vcc, and the remaining pin to ground.

[0056] In some examples, as shown in Figure 2, the multiple light-emitting elements 2 are arranged with gaps between them, i.e., there are gaps between the multiple light-emitting elements 2. As shown in Figures 3 to 9, the light-adjusting layer 3 is located within the gaps between the multiple light-emitting elements 2 and on the surface of the multiple light-emitting elements 2 away from the first base 1, so as to surround at least one light-emitting element 2.

[0057] Here, the statement that the light-adjusting layer 3 surrounds at least one light-emitting element 2 means that the light-adjusting layer is in relatively close contact with the side surface of at least one light-emitting element 2 and the surface away from the first base 1, and that the light-adjusting layer relatively completely covers the side surface of at least one light-emitting element 2 and the surface away from the first base 1. This not only protects the surface of the at least one light-emitting element 2 and ensures its quality, but also allows the at least one light-emitting element 2 to be stably fixed by the first base 1, preventing the light-emitting element 2 from becoming loose and making it difficult to electrically connect to the first base 1, and furthermore, ensures a good display effect of the display substrate 100.

[0058] In some examples, the material of the light-modulating layer 3 includes a light-absorbing material, and the light-modulating layer 3 is arranged to absorb at least a portion of the light incident on it.

[0059] Here, the light incident on the light-adjusting layer 3 includes light incident on the light-adjusting layer 3 from the outside and light emitted from the multiple light-emitting elements 2.

[0060] Since the area of ​​light incident on the light-adjusting layer 3 from the outside is approximately equal to the area of ​​the surface of the light-adjusting layer 3 away from the first base 1, almost all of the light incident on the light-adjusting layer 3 from the outside can be absorbed by the light-adjusting layer 3. As a result, during the process of the display substrate 100 performing display, the amount of light incident on the display substrate 100 from the outside and reflected by the first base 1 and / or the multiple light-emitting elements 2 can be reduced by the light-adjusting layer 3. When the display substrate 100 is in a dark state (i.e., when the light-emitting elements are not emitting light), the display surface of the display substrate 100 can be made even darker, effectively improving the contrast of the display substrate 100.

[0061] Since the propagation direction of light emitted from the light-emitting element 2 is almost arbitrary, when light emitted from the light-emitting element 2 is incident on the light-adjusting layer 3, the portion of the material of the light-adjusting layer 3 containing the light-absorbing material absorbs the light, while the portion without the light-absorbing material allows the light to pass through smoothly. As a result, 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 compared to conventional technology, and is advantageous in reducing the power consumption of the display substrate 100.

[0062] In some embodiments, as shown in Figures 3 to 9, the second base 4 covers the light-adjusting layer 3.

[0063] As an example, the second base 4 may be a PET base. This PET base has good plasticity and high transparency, thereby ensuring that the PET base has good light transmittance and reducing or avoiding the loss of light transmitted through the PET base.

[0064] In this example, a light-adjusting layer 3 is formed on one side of the second base 4, and the light-adjusting layer 3 and the second base 4 are pressed together, for example, by a pressing process, to the first base 1 on which multiple light-emitting elements 2 are formed. Compared to the conventional technique, this avoids polishing the light-adjusting layer 3, making the surface of the light-adjusting layer 3 away from the first base 1 a flat surface. Furthermore, the second base 4 protects the light-adjusting layer 3, preventing damage to the surface of the light-adjusting layer 3 away from the first base 1, and making the chromaticity of the surface of the display substrate 100 relatively uniform.

[0065] As described above, in some embodiments of the present disclosure, the display substrate 100 has a light-adjusting layer 3 provided in the gaps between the multiple light-emitting elements 2 and on the surfaces of the multiple light-emitting elements 2 away from the first base 1, and the side of the light-adjusting layer 3 away from the first base 1 is covered with a second base 4. This not only protects the multiple light-emitting elements 2 with the light-adjusting layer 3 and protects the light-adjusting layer 3 with the second base 4, but also allows the light-adjusting layer 3 to absorb at least a portion of the light incident on the light-adjusting layer 3, thereby improving the contrast of the display substrate 100 and reducing the power consumption of the display substrate 100 compared to the prior art. Furthermore, since the light-adjusting layer 3 and the second base 4 are pressed onto the first base 1 on which the multiple light-emitting elements 2 are formed, for example by a pressing process, it is possible to avoid polishing the light-adjusting layer 3 compared to the prior art, thus omitting a process and improving the uniformity of the surface of the display substrate 100.

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

[0067] In some embodiments, as shown in Figure 4, the light-adjusting layer 3 includes a first sub-light-adjusting layer 31 located in the gap between a plurality of light-emitting elements 2, and a second sub-light-adjusting layer 32 provided on the side of the first sub-light-adjusting 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 multiple light-emitting elements 2, and these relationships are related to the structure of the multiple light-emitting elements 2.

[0069] As an example, the multiple light-emitting elements 2 include Mini LEDs. The positional relationship between the first sub-light-adjusting layer 31 and the multiple light-emitting elements 2 is such that, with respect to the first base 1, the surface of the first sub-light-adjusting layer 31 away from the first base 1 is at the same level as the surface of the multiple light-emitting elements 2 away from the first base 1, or, as shown in Figure 4, is lower than the surface of the multiple light-emitting elements 2 away from the first base 1. In this case, the first sub-light-adjusting layer 31 is entirely located within the gaps between the multiple light-emitting elements 2, that is, the first sub-light-adjusting layer 31 covers at least a portion of the sides of the multiple light-emitting elements 2.

[0070] Here, since the first sub-light-adjusting layer 31 is located entirely within the gaps between the multiple light-emitting elements 2, the distance between the surface of the first sub-light-adjusting layer 31 away from the first base 1 and the first base 1 is equal to the thickness of the first sub-light-adjusting layer 31. The thickness of the first sub-light-adjusting layer 31 may be 80% to 100% of the thickness of the multiple light-emitting elements 2 (i.e., the dimensions of the multiple light-emitting elements 2 in the direction perpendicular to the first base 1). For example, if the thickness of the multiple light-emitting elements 2 is 100 μm, the thickness of the first sub-light-adjusting layer 31 may be 80 μm to 100 μm. For example, if the thickness of the multiple light-emitting elements 2 is 150 μm, the thickness of the first sub-light-adjusting layer 31 may be 120 μm to 150 μm. The specific thickness of the first sub-light-adjusting layer 31 can be selected and set according to actual requirements.

[0071] As an example, the multiple light-emitting elements 2 include Mini LEDs or Micro LEDs. Furthermore, the positional relationship between the first sub-light-adjusting layer 31 and the multiple light-emitting elements 2 may be such that the surface of the first sub-light-adjusting layer 31 away from the first base 1 is higher than the surface of the multiple light-emitting elements 2 away from the first base 1. In this case, a portion of the first sub-light-adjusting layer 31 is located within the gaps between the multiple light-emitting elements 2, and the other portion is located on the surface of the multiple light-emitting elements 2 away from the first base 1; that is, the first sub-light-adjusting layer 31 covers the exposed surfaces of the multiple light-emitting elements 2 (including the sides of the multiple 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 first base 1 may be greater than the thickness of the multiple light-emitting elements 2, and less than or equal to 120% of the thickness of the multiple light-emitting elements 2.

[0073] As an example, the multiple light-emitting elements 2 include Micro LEDs. Here, the thickness of the Micro LEDs is generally small, for example, it can be 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 about 10 μm. Thus, with respect to the first base 1, the surface of the first sub-light-adjusting layer 31 away from the first base 1 is higher than the surface of the multiple light-emitting elements 2 away from the first base 1. For example, if the thickness of the light-emitting elements 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 first base 1 may be greater than 10 μm and 12 μm or less. The specific thickness of the first sub-light-adjusting layer 31 can be selected and set according to actual requirements.

[0074] Furthermore, the first sub-light adjustment layer 31 also covers the portion located in the gap between the multiple light-emitting elements 2 of the first base 1. 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 improves the connectivity between the multiple light-emitting elements 2 and the first base 1, allowing the multiple light-emitting elements 2 to be firmly fixed by 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 the light incident on the first sub-light adjustment layer 31. This reduces or avoids the reflection of light incident on the first sub-light adjustment layer 31 from the first base 1 and / or the multiple light-emitting elements 2 by absorbing the light incident on the first sub-light adjustment layer 31 from the outside, and 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, in the above example, if 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, the distance between the surface of the first sub-light adjustment layer 31 away from the first base 1 and the first base 1 is at most 120% of the thickness of the light-emitting elements 2. This makes it possible to significantly reduce the dimensions of the first sub-light adjustment layer 31 on the surfaces of the multiple light-emitting elements 2 away from the first base 1 compared to the 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] In another example, as shown in Figure 4, the second sub-light-adjusting layer 32 included in the light-adjusting layer 3 has a surface that is away from the first base 1 that is higher than the surfaces of the multiple light-emitting elements 2 that are away from the first base 1. That is, a portion of the second sub-light-adjusting layer 32 is located between the multiple light-emitting elements 2 and the second base 4. In this way, when forming the light-adjusting layer 3 and the second base 4 on the first base 1 having multiple light-emitting elements 2, for example using a crimping process, the portion of the second sub-light-adjusting layer 32 located between the multiple light-emitting elements 2 and the second base 4 protects the multiple light-emitting elements 2, preventing damage to the multiple light-emitting elements 2 during crimping.

[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 multiple light-emitting elements 2.

[0079] For example, if 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 multiple light-emitting elements 2 away from the first base 1, or if it is higher than the surfaces of the multiple light-emitting elements 2 away from the first base 1, then the surface of the second sub-light adjustment layer 32 closer to the first base 1 is a relatively flat surface, and as a result, the thickness of each part of the second sub-light adjustment layer 32 becomes relatively uniform. The thickness of the second sub-light adjustment layer 32 can be selected and set according to actual needs; for example, the thickness range of the second sub-light adjustment layer 32 may be 50 μm to 100 μm, or the thickness range of the second sub-light adjustment layer 32 may be 10 μm to 40 μm.

[0080] As an example, as shown in Figure 4, if the surface of the first sub-light adjustment layer 31 away from the first base 1 is lower than the surface of the multiple light-emitting elements 2 away from 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 orthographic projection onto the first base overlaps with the orthographic projection of the multiple light-emitting elements 2 onto the first base 1, and a second portion 322 whose orthographic projection onto the first base overlaps with the orthographic projection of the first sub-light adjustment layer 31 onto the first base 1. The thickness range of the first portion 321 may be 20 μm to 100 μm. The thickness range of the second portion 322 is 50 μm to 100 μm.

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

[0082] In some cases, 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). Since the light emitted from the multiple light-emitting elements 2 can smoothly pass through the second sub-light adjustment layer 32 and exit to the outside, it is possible to avoid the second sub-light adjustment layer 32 adversely affecting the propagation of light emitted from the multiple light-emitting elements 2.

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

[0084] Since the refractive index of ambient light is approximately 1.0, by setting the refractive index of the second sub-light adjustment layer 32 and the refractive index of the second base 4 such that the refractive index of the second sub-light adjustment layer 32 is greater than the refractive index of the second base 4, the light emitted from the multiple light-emitting elements 2 can be gradually emitted from the light-tight medium to the light-sparse medium during the process of emitting to the outside. As a result, compared to the case where the light emitted from the multiple light-emitting elements 2 is directly emitted into the ambient air, the emission of light can be induced, and total internal reflection can be reduced or avoided.

[0085] In another embodiment, as shown in Figure 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 direction of the first base 1.

[0086] In some examples, the positional relationship between the first sub-light-adjusting layer 31 and the multiple light-emitting elements 2 is such that, with respect to the first base 1, the surface of the third sub-light-adjusting layer 31 away from the first base 1 is at the same level as the surface of the multiple light-emitting elements 2 away from the first base 1, or, as shown in Figure 6, is lower than the surface of the multiple light-emitting elements 2 away from the first base 1. The third sub-light-adjusting layer 33 is entirely located within the gaps between the multiple light-emitting elements 2, that is, the third sub-light-adjusting layer 33 covers at least a portion of the sides of the multiple light-emitting elements 2.

[0087] In some examples, the material of the third sub-light adjustment layer 33 includes a light-reflective material, and the third sub-light adjustment layer 33 is arranged to reflect back the light incident on the third sub-light adjustment layer 33 from the multiple light-emitting elements 2 to the multiple light-emitting elements 2. As a result, when light emitted from the multiple light-emitting elements 2 shines on the side surface of the multiple 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. Consequently, the reflected light can be emitted to the outside from a surface away from the first base 1 of the multiple light-emitting elements 2, improving the utilization efficiency of the light emitted from the multiple light-emitting elements 2, increasing the light efficiency of the display substrate 100, and contributing to a reduction in the power consumption of the display substrate 100.

[0088] By having the third sub-light adjustment layer 33 cover only at least a portion of the sides of the multiple light-emitting elements 2, it is ensured that the light emitted from the multiple light-emitting elements 2 can be reliably emitted from surfaces away from the first base 1 of the multiple light-emitting elements 2, thus avoiding the problem of the light being reflected back into the multiple light-emitting elements 2 after hitting surfaces away from the first base 1 and having difficulty being emitted to the outside.

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

[0090] Here, if the light-adjusting layer 3 further includes a third sub-light-adjusting layer 33, the positional relationship between the first sub-light-adjusting layer 31 and the multiple light-emitting elements 2 is such that, with respect to the first base 1, the surface of the first sub-light-adjusting layer 31 away from the first base 1 is at the same level as, or higher than, or lower than, the surface of the multiple light-emitting elements 2 away from the first base 1. For example, the distance between the surface of the first sub-light-adjusting layer 31 away from the first base 1 and the first base 1 is 80% to 120% of the thickness of the multiple light-emitting elements 2. Further explanations of the first sub-light-adjusting layer 31 and the second sub-light-adjusting layer 32 can be found in the explanations of the first sub-light-adjusting layer 31 and the second sub-light-adjusting layer 32 in some of the examples above, and are therefore omitted here.

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

[0092] In some embodiments, as shown in Figure 5, the third sub-light-adjusting layer 33 is located within the gaps between the multiple light-emitting elements 2. With respect to 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 surface of the multiple light-emitting elements 2 away from the first base 1, or lower than the surface of the multiple light-emitting elements 2 away from the first base 1. In this case, the third sub-light-adjusting layer 33 is entirely located within the gaps between the multiple light-emitting elements 2, i.e., the third sub-light-adjusting layer 33 covers at least a portion of the sides of the multiple light-emitting elements 2.

[0093] In some examples, as shown in Figure 5, the first sub-light adjustment layer 31 is provided on the side of the third sub-light adjustment layer 33 away from the first base 1. With respect to the first base 1, the surface of the first sub-light adjustment layer 31 away from the first base 1 is higher than the surface of the multiple light-emitting elements 2 away from the first base 1. That is, regardless of the positional relationship between the surface of the third sub-light adjustment layer 33 away from the first base 1 and the surface of the multiple light-emitting elements 2 away from the first base 1, the first sub-light adjustment layer 31 covers the multiple light-emitting elements 2 and the third sub-light adjustment layer 33, and a portion of the first sub-light adjustment layer 31 is positioned on the surface 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 a third sub-light adjustment layer 33 and a 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 improves the utilization efficiency of light emitted from the multiple light-emitting elements 2 by the third sub-light adjustment layer 33, thereby increasing the light efficiency of the display substrate 100, reducing the power consumption of the display substrate 100, and improving the contrast of the display substrate 100 by the first sub-light adjustment layer 31.

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

[0096] Further explanations regarding the third sub-light adjustment layer 33 and the first sub-light adjustment layer 31 can be found in the descriptions of the third sub-light adjustment layer 33 and the first sub-light adjustment layer 31 in some of the embodiments described above, so such explanations are omitted here.

[0097] In some of the above embodiments, the material of each thin film included in the light-adjusting layer 3 includes multiple types.

[0098] In some examples, when the light-modulating layer 3 includes a first sub-light-modulating layer 31, the material of the first sub-light-modulating 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-modulating layer 3 includes a second sub-light-modulating layer 32, the material of the second sub-light-modulating layer 32 includes an acrylic adhesive.

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

[0101] The above-mentioned acrylic adhesive is colorless and transparent, has advantages such as high light transmittance (for example, light transmittance may be 90% or more), and good adhesive strength. This allows for good adhesion between each thin film in the light-adjusting layer 3, and good adhesion between the light-adjusting layer 3 and the first base 1, each light-emitting element 2, and the second base 4. This improves the connectivity between each light-emitting element 2 and the first base 1, and prevents the second base 4 and the light-adjusting layer 3 from falling off.

[0102] In some embodiments, as shown in Figure 7, each of the multiple light-emitting elements 2 included in the display substrate 100 includes a third base 22 and a light-emitting layer 21 provided on one side of the third base 22. The light-emitting layer 21 is closer to the first base 1 than to the third base 22.

[0103] Below, as shown in Figure 11, the structure of the light-emitting element 2 will be schematically explained using the case where the light-emitting element 2 is a Mini LED as an example.

[0104] As shown in Figure 11, the Mini LED includes a third base 22, an N-type semiconductor layer 23, an emissive layer 21, a P-type semiconductor layer 24, a current-blocking layer 25, a conductive layer 26, a Bragg reflective 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.

[0105] When applying the structure shown in Figure 11 to the structure 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 drive transistor 12 via the anode welding pad 15.

[0106] In this embodiment, the light-emitting layer 21 is capable of emitting light, and the light emitted from each light-emitting layer 21 can sequentially pass through the third base 22, the light-adjusting layer 3, and the second base 4 and be emitted to the outside.

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

[0108] The refractive index of the second sub-light adjustment layer 32 is greater than that of the second base 4, and the refractive index of the second base 4 is greater than that of the ambient air. Therefore, by making the refractive index of the third base 22 greater than that of the second sub-light adjustment layer 32, the refractive index of each medium transmitted through the light can be gradually lowered at a constant gradient during the process of light emitted from the light-emitting layer 21 being emitted to the outside. This makes it possible to induce light emission, reduce or avoid total internal reflection, and improve light efficiency compared to when light is emitted directly to the outside air.

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

[0110] In some examples, when the light-adjusting layer 3 includes a third sub-light-adjusting layer 33, the positional relationship between the surface of the third sub-light-adjusting layer 33 away from the first base 1 and the multiple light-emitting elements 2 may further include the fact that the surface of the third sub-light-adjusting layer 33 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 first base 1. This ensures that almost all of the light that shines on the third sub-light-adjusting layer 33 is reflected back to the light-emitting elements 2, and prevents the reflected light from entering adjacent light-emitting elements 2 and causing color mixing.

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

[0112] By providing a reflective layer 5 on the side of the multiple light-emitting elements 2 closest to the first base 1, the reflective layer 5 can be used to reflect the light that shines on the reflective layer 5 back into the multiple light-emitting elements 2, and then emit it outwards from the surface of the multiple light-emitting elements 2 that is away from the first base 1. This improves the utilization efficiency of the light emitted from the multiple light-emitting elements 2, increases the light efficiency of the display substrate 100, and is advantageous in reducing the power consumption of the display substrate 100.

[0113] For 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 away from the first base 1 may be a flat surface. Of course, as shown in Figures 8 and 9, a plurality of microstructures 41 may be provided on the surface of the second base 4 away from the first base 1. 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 shapes of the multiple microstructures 41 described above are related to the changes in the propagation direction of at least some of the light transmitted through the second base 4.

[0116] In some examples, as shown in Figure 8, the surface shape of the plurality of microstructures 41 includes at least one of a pyramid and a wedge. The tip of the pyramid or wedge is located on one side away from the second base 41. In this case, the plurality of microstructures 41 can collect at least a portion of the light transmitted from the plurality of light-emitting elements 2 through the second base 4, 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. For example, the height of the microstructure 41 (i.e., the dimensions of the microstructure 41 in the direction perpendicular to the first base 1) may be about 12 μm, and the width of the microstructure 41 (i.e., the dimensions of the microstructure 41 at the connection point with the second base 4 shown in Figure 9) may be about 24 μm. For example, the height of the microstructure 41 may be 11 μm, 12 μm, or 13 μm, and the width of the microstructure 41 may be 23 μm, 24 μm, or 25 μm.

[0118] In another example, as shown in Figure 9, the surface shape of the plurality of microstructures 41 includes at least one of a curved surface and a spherical surface. In this case, the plurality of microstructures 41 diffuse at least a portion of the light transmitted from the plurality of light-emitting elements 2 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 surface of the display substrate 100.

[0119] Here, the dimensions of the microstructure 41 can be selected and set according to actual needs. For example, the diameter of the microstructure 41 may be 20 μm to 30 μm, and the height of the microstructure 41 (i.e., the dimension of the microstructure 41 in the direction perpendicular to 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, and the height of the microstructure 41 may be 9 μm, 10 μm, or 11 μm.

[0120] In some cases, the above-mentioned microstructures are integrated with the second base 4. This is advantageous for simplifying the structure of the display substrate 100.

[0121] As an example, the multiple microstructures 41 may be formed by etching the surface of the second base 4 away from the first base 1 using an etching process. Since the second base 4 has a certain hardness, the structure of the multiple microstructures 41 formed by the etching process is extremely stable, and deformation can be avoided.

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

[0123] In this case, as shown in Figure 10, the light adjustment layer 3 may include a third sub-light adjustment layer 33 located in the gap between the multiple light-emitting elements 2, and a second sub-light adjustment layer 32 provided on the side of the third sub-light adjustment layer 33 away from the first base 1. Here, with respect to the first base 1, the surface of the third sub-light adjustment layer 33 away from the first base 1 is lower than the surface of the light-emitting layer 21 of the multiple 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 surface of the multiple light-emitting elements 2 away from the first base 1. In this way, the third sub-light adjustment layer 33 can be used to completely reflect the light emitted from each direction of the multiple light-emitting elements 2, and the second sub-light adjustment layer 32 and the second base 4 can be used to guide the light, thereby avoiding total internal reflection. This effectively improves the brightness that can be displayed on the display substrate 100.

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

[0125] Some embodiments of this disclosure provide a method for manufacturing a display substrate. As shown in Figure 16, the method for manufacturing the display substrate includes steps S100 to S300.

[0126] In S100, as shown in Figures 17(a) and 17(b) and Figures 18(a) and 18(b), a first base 1 is provided, and a plurality of light-emitting elements 2 are provided on one side of the first base 1, spaced apart from each other.

[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 can 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 multiple light-emitting elements 2, and the connection between the first base 1 and the multiple light-emitting elements 2 can be found in the descriptions of the several embodiments described above, so such descriptions are omitted here.

[0129] In S200, as shown in Figure 17(c) and Figure 18(c), a second base 4 is provided, and a light-adjusting layer 3 is formed on one side of the second base 4 using a light-absorbing material.

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

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

[0132] In some examples, as shown in Figures 17(c) and 18(c), the light-adjusting layer 3 includes a first sub-light-adjusting layer 31 and a second sub-light-adjusting layer 32 that are stacked together.

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

[0134] In S300, as shown in Figures 17(d) and (e) and Figures 18(d) and (e), a crimping process is used to crimp 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, embedding the plurality of light-emitting elements 2 within the light-adjusting layer 3, and positioning a portion of the light-adjusting layer 3 within the gaps between the plurality of light-emitting elements 2, while positioning the other portion 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-adjusting layer 3 further includes an acrylic adhesive.

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

[0137] Because the acrylic adhesive has a certain elasticity and the ability to fill in steps, in 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 enter the light-adjusting layer 3 until they are completely embedded inside the light-adjusting layer 3; and a portion 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 parts of the light-adjusting layer 3 are located on surfaces away from the first base 1 of the multiple light-emitting elements 2, i.e., between the multiple light-emitting elements 2 and the second base 4. Therefore, the other parts of the light-adjusting layer 3 can protect the multiple light-emitting elements 2, and it is possible to avoid the second base 4 directly contacting the multiple light-emitting elements 2 and damaging them.

[0139] In some embodiments of the present disclosure, the method for manufacturing a display substrate 100 involves forming a light-adjusting layer 3 on one side of a second base 4, and then using a crimping process to crimp a first base 1 on which a plurality of light-emitting elements 2 are formed with the second base 4 on which the light-adjusting layer 3 is formed. This embeds the plurality of light-emitting elements 2 into the light-adjusting layer 3, and by placing a portion of the light-adjusting layer 3 into the gaps between the plurality of light-emitting elements 2 and positioning the other portion on the surface of the plurality of light-emitting elements 2 away from the first base 1, at least a portion of the light incident on the light-adjusting layer 3 can be absorbed by the light-adjusting layer 3, thereby improving the contrast of the display substrate 100 without increasing the power consumption of the display substrate 100. Furthermore, compared to the prior art, the method for manufacturing a display substrate 100 in some embodiments of the present disclosure has a simple process, is easy to operate, avoids polishing the light-adjusting layer 3, avoids whitening of the surface of the display substrate 100, and improves the surface uniformity of the display substrate 100.

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

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

[0142] As shown in Figure 17(d), in the process of bonding the first base 1, on which multiple light-emitting elements 2 are formed, to the second base 4, on which the light-adjusting layer 3 is formed, using a vacuum bonding process, the entire second base 4 on which the light-adjusting layer 3 is formed can be bonded while performing a vacuum operation. As a result, the surface of the light-adjusting layer 3 that approaches the multiple light-emitting elements 2 can come into contact with the multiple light-emitting elements 2 almost simultaneously, allowing the multiple light-emitting elements 2 to enter the interior of the light-adjusting layer 3 almost simultaneously and be embedded inside the light-adjusting layer 3. Furthermore, the generation of air bubbles between the light-adjusting layer 3 and the first base 1 can be avoided.

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

[0144] As shown in Figure 18(d), in the process of pressing together a first base 1 on which multiple light-emitting elements 2 are formed and a second base 4 on which a light-adjusting layer 3 is formed by a rolling process, first, one end of the first base 1 on which multiple light-emitting elements 2 are formed (for example, the right end shown in Figure 18) and one end of the second base 4 on which the light-adjusting layer 3 is formed (for example, the right end shown in Figure 18) are pressed together to completely embed the light-emitting elements 2 at that end into the light-adjusting layer 3. Then, the pressing position is gradually moved to the other end on the opposite side (for example, the left end shown in Figure 18), and the multiple light-emitting elements 2 are sequentially embedded into the light-adjusting layer 3 from one end of the first base 1 to the other end on the opposite side. After that, a temperature-raising degassing operation may be performed. This can reduce or eliminate the possibility of bubbles forming between the light-adjusting layer 3 and the first base 1.

[0145] In some embodiments, when the light-adjusting layer 3 includes a multilayer thin film, the hardness of the thin film closer to the multiple light-emitting elements 2 is lower than the hardness of the thin film further away from the multiple light-emitting elements 2.

[0146] For example, the light-adjusting layer 3 includes a first sub-light-adjusting layer 31 and a second sub-light-adjusting layer 32, which are laminated together. In this case, the hardness of the first sub-light-adjusting layer 31 is lower than the hardness of the second sub-light-adjusting layer 32. This makes it easier to embed the multiple light-emitting elements 2 into the first sub-light-adjusting layer 31 during the process of bonding the first base 1, on which the multiple light-emitting elements 2 are formed, to the second base 4, on which the light-adjusting layer 3 is formed. If the surface of the first sub-light-adjusting layer 31 away from the first base 1 is lower than the surface of the multiple light-emitting elements 2 away from the first base 1, the speed at which the multiple light-emitting elements 2 enter the second sub-light-adjusting layer 32 can be slowed down, making it easier to control and preventing the multiple light-emitting elements 2 from penetrating the second sub-light-adjusting layer 32 and coming into contact with the second base 2, thereby preventing damage to the multiple light-emitting elements 2.

[0147] Furthermore, in some embodiments of this disclosure, the speed at which multiple light-emitting elements 2 enter the interior of the light-adjusting layer 3 can be controlled by controlling the thickness of the second sub-light-adjusting layer 32.

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

[0149] The display board 100 included in the above-mentioned display device 200 has the same structure as the display board 100 provided in the above-mentioned embodiments and achieves the same effects, so its description is omitted here.

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

[0151] The above description is merely a specific embodiment of the Disclosure, and the scope of protection of the Disclosure is not limited thereto. Any modification or substitution that a person skilled in the art could conceive of within the technical scope of the Disclosure is included within the scope of protection of the Disclosure. Therefore, the scope of protection of the Disclosure should be determined by the scope of protection of the claims.

Claims

1. 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 material of the light modulating layer includes a light absorbing material, and the light modulating layer is arranged to absorb at least a portion of the light incident on the light modulating layer; Display board.

2. The light adjustment layer is a first sub-light adjustment layer located in the gaps between the plurality of light-emitting elements; a second sub-light adjustment layer provided on a side of the first sub-light adjustment layer away from the first base, With respect to the first base, a surface of the first sub-light adjustment layer away from the first base is at the same level as surfaces of the plurality of light-emitting elements away from the first bases, or is higher or lower than surfaces of the plurality of light-emitting elements away from the first bases; a material of the first sub-light adjustment layer includes a light-absorbing material, and the first sub-light adjustment layer is arranged to absorb at least a portion of light incident on the first sub-light adjustment layer; a surface of the second 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 with respect to the first base; and the second sub-light adjustment layer is a transparent thin film. The display substrate according to claim 1 .

3. When a surface of the first sub-light adjustment layer away from the first base is lower than surfaces of the plurality of light-emitting elements away from the first base, the second sub-light adjustment layer includes a first portion whose orthogonal projection onto the first base overlaps with the orthogonal projection onto the first base of the plurality of light-emitting elements, and a second portion whose orthogonal projection onto the first base overlaps with the orthogonal projection onto the first base of the first sub-light adjustment layer, the thickness of the first portion ranging from 20 μm to 100 μm, and the thickness of the second portion ranging from 50 μm to 100 μm; The display substrate according to claim 2 .

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

5. A display substrate described in any one of claims 2 to 4, wherein the distance between the surface of the first sub-light adjustment layer away from the first base and the first base is 80% to 120% of the thickness of the plurality of light-emitting elements.

6. The light adjustment layer is Further including a third sub-light adjustment layer located in the gaps between the plurality of light emitting elements and provided between the first sub-light adjustment layer and the first base; With respect to the first base, a surface of the third sub-light adjustment layer away from the first base is at the same level as surfaces of the plurality of light-emitting elements away from the first base, or is lower than surfaces of the plurality of light-emitting elements away from the first base; a material of the third sub-light adjustment layer including a light reflective material, and the third sub-light adjustment layer is arranged to reflect light incident on the third sub-light adjustment layer from the plurality of light emitting elements back to the plurality of light emitting elements; The display substrate according to any one of claims 2 to 5.

7. The light adjustment layer is a third sub-light adjustment layer located in the gaps between the plurality of light-emitting elements; a first sub-light adjustment layer provided on a side of the third sub-light adjustment layer away from the first base, With respect to the first base, a surface of the third sub-light adjustment layer away from the first base is at the same level as surfaces of the plurality of light-emitting elements away from the first bases or is lower than surfaces of the plurality of light-emitting elements away from the first bases; a material of the third sub-light adjustment layer includes a light-reflecting material, and the third sub-light adjustment layer is arranged to reflect light incident on the third sub-light adjustment layer from the plurality of light-emitting elements back to the plurality of light-emitting elements. a surface of the first 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; a material of the first sub-light adjustment layer includes a light-absorbing material, and the first sub-light adjustment layer is arranged to absorb at least a portion of light incident on the first sub-light adjustment layer; The display substrate according to claim 1 .

8. The display substrate according to claim 6 , wherein the reflectance of the third sub-light adjustment layer is 70% or more.

9. 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 is closer to the first base than the third base; The display substrate according to any one of claims 2 to 7.

10. The display substrate of claim 9 , wherein when the light adjusting layer includes a second sub-light adjusting layer, the refractive index of the third base is greater than the refractive index of the second sub-light adjusting layer.

11. A display substrate as described in claim 9 or 10, wherein when the light adjustment layer includes a third sub-light adjustment layer, the surface of the third sub-light adjustment layer away from the first substrate is higher than the surfaces of the plurality of light-emitting elements away from the first substrate relative to the first base.

12. When the light adjustment layer includes the first sub-light adjustment layer, a material of the first sub-light adjustment layer includes an acrylic adhesive doped with a light absorbing material; When the light adjustment layer includes a second sub-light adjustment layer, the material of the second sub-light adjustment layer includes an acrylic adhesive; When the light adjustment layer includes a third sub-light adjustment layer, the material of the third sub-light adjustment layer includes an acrylic adhesive doped with a light reflecting material. The display substrate according to any one of claims 2 to 11.

13. a plurality of microstructures are provided on a surface of the second base remote from the first base; 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 any one of claims 1 to 12.

14. The display substrate of claim 13 , wherein the surface shapes of the plurality of microstructures include at least one of a pyramid, a wedge, a curved surface, and a spherical surface.

15. 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. A method for manufacturing a display substrate.

16. The method for manufacturing a display substrate according to claim 15 , wherein the pressure-bonding step includes a vacuum pressure-bonding step or a rolling step.

17. A display device comprising the display substrate according to any one of claims 1 to 14.

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