Light-emitting substrate and display device

Abstract

A light-emitting substrate (01) and a display device (1000). The light-emitting substrate (01) includes a substrate (101), a reflective layer (100), at least one pad (201), a light-emitting element (102), and a connecting portion (105). The reflective layer (100) includes an opening (103) with a maximum size of H1 in the first direction (X); the light-emitting element (102) includes a first electrode (202) and a second electrode (203) spaced apart in the second direction (Y), and the maximum size of the first electrode (202) or the second electrode (203) in the first direction (X) is a first size K1; the connecting portion (105) includes an edge arc region (150), and the maximum size in the first direction (X) is M; at least one pad (201) includes a first pad (204), the first pad (204) includes a first size portion (205), and the minimum distance between the first size portion (205) and the opening (103) in the first direction (X) is a second size K2, satisfying: K2≤0.5H1-0.5(K1+2M), and 50μm≤H1-2K2-K1≤100μm. By optimizing the fit dimensions between the opening (103) of the reflective layer (100) and the pad (201) in the light-emitting substrate (01), the risk of gold seepage in the reflective layer (100) can be reduced, and the lateral tilt of the light-emitting element (102) can be avoided, thereby improving the optical performance of the display product.

Description

Technical Field

[0001] At least one embodiment of this disclosure relates to a light-emitting substrate and a display device. Background Technology

[0002] Currently, micro LED display technology is becoming increasingly mature, featuring low energy consumption and high brightness, thus possessing high development prospects. Summary of the Invention

[0003] At least one embodiment of this disclosure provides a light-emitting substrate and a display device.

[0004] This disclosure provides a light-emitting substrate, comprising: a substrate; a reflective layer disposed on the substrate, the reflective layer including an opening, the maximum dimension of the opening in a first direction being H1; at least one pad, the orthographic projection of the at least one pad on the substrate at least partially overlapping the orthographic projection of the opening on the substrate; a light-emitting element disposed on the substrate, the orthographic projection of the light-emitting element on the substrate at least partially overlapping the orthographic projection of the opening on the substrate, the light-emitting element including a first electrode and a second electrode; and a connecting portion disposed between the pad and the light-emitting element, configured to connect the pad and the light-emitting element. The light-emitting elements are connected, and the connection portion includes an edge arc region, the maximum size of which in the first direction is M; wherein, the first electrode and the second electrode are spaced apart in the second direction, the second direction intersects the first direction, and the maximum size of the first electrode or the second electrode in the first direction is a first size K1; the at least one pad includes a first pad, the first pad includes a first size portion, the minimum distance between the first size portion and the opening in the first direction is a second size K2, the second size K2 satisfies: K2≤0.5H1-0.5(K1+2M), and 50 μm≤H1-2K2-K1≤100 μm.

[0005] For example, according to an embodiment of the present disclosure, the first pad further includes a second dimension portion, the second dimension portion being at a maximum distance of a third dimension H2 from the opening in the first direction, the third dimension H2 satisfying: 0.5H1-0.6K1 ≤ H2 ≤ 0.5H1-0.4K1.

[0006] For example, according to an embodiment of this disclosure, the at least one pad further includes a second pad, the first pad and the second pad are spaced apart and symmetrical with respect to a first center line located between the first pad and the second pad; the first electrode and the second electrode are symmetrically distributed with respect to a second center line located between the first electrode and the second electrode of the light-emitting element; wherein, the at least one pad is disposed on the side of the first electrode and the second electrode closer to the substrate; the minimum distance between the first electrode and the second electrode in the second direction is a fourth dimension Z; the minimum distance between the first pad and the second pad in the second direction is a fifth dimension D, 0.9Z ≤ D ≤ Z.

[0007] For example, according to an embodiment of this disclosure, the maximum distance between the first dimension portion and the first center line in the second direction is a sixth dimension C1, the minimum distance between the second dimension portion 207 and the first center line in the second direction is a seventh dimension C2; the maximum distance between the first electrode and the second center line in the second direction is an eighth dimension Y, where Y = MAX(C1, C2).

[0008] For example, according to an embodiment of the present disclosure, in the second direction, the maximum distance between the edge of the first pad away from the second pad and the edge of the second pad away from the first pad is equal to the maximum size of the opening; the first size portion and the second size portion respectively include a first end and a second end opposite to each other, and the first end of the first size portion is closer to the first center line than the second end of the first size portion, and the first end of the second size portion is closer to the first center line than the second end of the second size portion.

[0009] For example, according to an embodiment of the present disclosure, in the first direction, the minimum distance between the first end of the first dimension portion and the opening is a second dimension K2, and the maximum distance between the first end of the second dimension portion and the opening is a third dimension H2.

[0010] For example, according to an embodiment of the present disclosure, the first dimension portion is projected onto the substrate as a rectangle, the dimension of the first dimension portion in the first direction is greater than the dimension of the first dimension portion in the second direction, and the projection of the second end of the first dimension portion onto the substrate overlaps with the projection of the opening onto the substrate; the second dimension portion is projected onto the substrate as a trapezoid, and the second dimension portion includes an upper base and a lower base parallel to the first center line, and the distance between the upper base and the opening in the first direction is greater than the distance between the lower base and the opening in the first direction.

[0011] For example, according to an embodiment of this disclosure, the first dimension portion is projected as a rectangle on the substrate, and the size of the first dimension portion in the first direction is greater than the size of the first dimension portion in the second direction; the second dimension portion is projected as a rectangle on the substrate, and the size of the second dimension portion in the first direction is greater than the size of the second dimension portion in the second direction; the first pad further includes a third dimension portion, the third dimension portion including opposing first and second ends, and in the second direction the first end of the third dimension portion is connected to the second end of the first dimension portion, the orthographic projection of the second end of the third dimension portion on the substrate overlaps with the orthographic projection of the opening on the substrate, and the size of the third dimension portion in the second direction is smaller than the size of the first dimension portion in the second direction.

[0012] For example, according to an embodiment of the present disclosure, the size of the second dimension portion in the first direction gradually increases from the first end of the second dimension portion to the second end of the second dimension portion, and the size of the second end of the second dimension portion in the first direction is equal to the size of the first end of the first dimension portion in the first direction.

[0013] For example, according to an embodiment of the present disclosure, in the first direction, the minimum distance between the first end of the first dimension portion and the opening is the second dimension K2, the maximum distance between the first end of the second dimension portion and the opening is the third dimension H2, and the orthographic projection of the second end of the second dimension portion on the substrate overlaps with the orthographic projection of the opening on the substrate.

[0014] For example, according to an embodiment of the present disclosure, the first dimension portion is projected onto the substrate as a rectangle, and the dimension of the first dimension portion in the first direction is greater than the dimension of the first dimension portion in the second direction; the second dimension portion is projected onto the substrate as a rectangle, and the dimension of the second dimension portion in the first direction is smaller than the dimension of the first dimension portion in the second direction; the second end of the first dimension portion is connected to the first end of the second dimension portion.

[0015] For example, according to an embodiment of this disclosure, the first pad further includes a third dimension portion, the third dimension portion including a first end and a second end opposite to each other, and in the second direction, the first end of the third dimension portion is connected to the second end of the first dimension portion, and the second end of the third dimension portion is connected to the first end of the second dimension portion; the dimension of the third dimension portion in the first direction gradually decreases from the first end of the third dimension portion to the second end of the third dimension portion, the dimension of the first end of the third dimension portion in the first direction is equal to the dimension of the second end of the first dimension portion in the first direction, and the dimension of the second end of the third dimension portion in the first direction is equal to the dimension of the first end of the second dimension portion in the first direction.

[0016] For example, according to an embodiment of this disclosure, the third dimension portion is projected onto the substrate in the form of a trapezoid.

[0017] For example, according to an embodiment of this disclosure, in the first direction, the size of the second end of the first dimension portion is equal to the size of the first end of the second dimension portion, and the second end of the first dimension portion is connected to the first end of the second dimension portion; the size of the first dimension portion in the first direction gradually decreases from the first end of the first dimension portion to the second end of the first dimension portion; the first pad further includes a third dimension portion, the third dimension portion including opposing first and second ends, and in the second direction, the second end of the third dimension portion abuts and engages with the first end of the first dimension portion; the size of the third dimension portion in the first direction gradually decreases from the first end of the third dimension portion to the second end of the third dimension portion.

[0018] For example, according to an embodiment of the present disclosure, the first dimension portion is projected as a trapezoid on the substrate, and the third dimension portion is projected as a trapezoid on the substrate.

[0019] For example, according to an embodiment of this disclosure, the connecting side between the first end of the first dimension portion and the first end of the second dimension portion is arc-shaped; the first end of the third dimension portion is arc-shaped.

[0020] For example, according to an embodiment of this disclosure, in the first direction, the minimum distance between the first end of the first dimension portion and the opening is a second dimension K2, and the maximum distance between the first end of the second dimension portion and the opening is a third dimension H2. The second end of the first dimension portion is connected to the first end of the second dimension portion. The first pad further includes a third dimension portion and a fourth dimension portion, each of which includes a first end and a second end. In the second direction, the first end of the third dimension portion is connected to the second end of the second dimension portion. The orthographic projection of the second end of the third dimension portion on the substrate overlaps with the orthographic projection of the opening on the substrate. The second end of the fourth dimension portion is connected to the first end of the first dimension portion. The dimension of the third dimension portion in the first direction gradually decreases from the first end to the second end. The dimension of the fourth dimension portion in the first direction gradually decreases from the first end to the second end. The dimension of the second end of the fourth dimension portion in the first direction is equal to the dimension of the first end of the first dimension portion in the first direction.

[0021] For example, according to an embodiment of this disclosure, the first dimension portion, the second dimension portion, the third dimension portion, and the fourth dimension portion are all trapezoidal when projected onto the substrate.

[0022] For example, according to an embodiment of the present disclosure, in the first direction, the maximum size of the first size portion is equal to the maximum size of the opening; the first size portion and the second size portion respectively include opposing first ends and second ends, and the first end of the first size portion and the first end of the second size portion are disposed on one side close to the first center line; the minimum distance between the second end of the first size portion and the opening in the second direction is substantially equal to the size of the first size portion in the second direction.

[0023] For example, according to an embodiment of the present disclosure, the size of the first dimension portion in the first direction is greater than the size of the first dimension portion in the second direction; the size of the second dimension portion in the second direction gradually increases from the first end to the second end of the second dimension portion.

[0024] For example, according to an embodiment of the present disclosure, the first dimension portion is projected onto the substrate as a rectangle, and the second dimension portion is projected onto the substrate as a trapezoid.

[0025] Embodiments of this disclosure provide a light-emitting substrate, comprising: a substrate; a reflective layer disposed on the substrate, the reflective layer including an opening; at least one pad, the orthographic projection of the at least one pad on the substrate at least partially overlapping the orthographic projection of the opening on the substrate, the at least one pad including a first pad and a second pad, the first pad and the second pad being symmetrically distributed with respect to a first center line located between the first pad and the second pad; a light-emitting element disposed on the substrate, the orthographic projection of the light-emitting element on the substrate at least partially overlapping the orthographic projection of the opening on the substrate, the light-emitting element including a first electrode and a second electrode, the first electrode and the... The second electrode is symmetrically distributed with respect to a second centerline located between the first electrode and the second electrode; a connecting portion is disposed between the at least one pad and the light-emitting element and is configured to connect the at least one pad and the light-emitting element; wherein the first pad is disposed on the side of one of the first electrode and the second electrode closer to the substrate, the second pad is disposed on the side of the other of the first electrode and the second electrode away from the substrate, the minimum interval between the first electrode and the second electrode in their arrangement direction is a fourth dimension Z, the minimum interval between the first pad and the second pad in their arrangement direction is a fifth dimension D, 0.9Z ≤ D ≤ Z.

[0026] Embodiments of this disclosure provide a light-emitting substrate, comprising: a substrate; a reflective layer disposed on the substrate, the reflective layer including an opening; at least one pad, the orthographic projection of the at least one pad on the substrate at least partially overlapping the orthographic projection of the opening on the substrate, the at least one pad including a first pad and a second pad, the first pad and the second pad being symmetrically distributed with respect to a first center line located between the first pad and the second pad; a light-emitting element disposed on the substrate, the orthographic projection of the light-emitting element on the substrate at least partially overlapping the orthographic projection of the opening on the substrate, the light-emitting element including a first electrode and a second electrode, the first electrode and the second electrode being symmetrically distributed with respect to a second center line located between the first electrode and the second electrode; and a connecting portion disposed on the at least one pad. The pad is configured to connect the at least one pad to the light-emitting element; wherein the first pad is disposed on the side of one of the first electrode and the second electrode closer to the substrate, and the second pad is disposed on the side of the other of the first electrode and the second electrode away from the substrate. The first pad includes a first size portion and a second size portion. The minimum distance between the first size portion and the first center line in the arrangement direction of the first pad and the second pad is a sixth size C1. The minimum distance between the second pad and the first center line in the arrangement direction of the first pad and the second pad is a seventh size C2. The maximum distance between the first electrode and the second center line in the arrangement direction of the first electrode and the second electrode is an eighth size Y, where Y = MAX(C1, C2).

[0027] An embodiment of this disclosure provides a light-emitting substrate, comprising: a substrate; a reflective layer disposed on the substrate, the reflective layer including an opening, the maximum dimension of the opening in a first direction being H1; at least one pad, the orthographic projection of the at least one pad on the substrate at least partially overlapping the orthographic projection of the opening on the substrate, the at least one pad including a first pad and a second pad, the first pad and the second pad being spaced apart in a second direction, the second direction intersecting the first direction, the first pad including a first size portion and a second size portion, wherein the first size portion has a minimum distance K2 with the opening, the second size portion has a maximum distance H2 with the opening, and satisfies: H2=H1 / 3±0.2μm, 50μm≤H1-2K2-(H1-2H2) / (1±0.2)≤100μm.

[0028] Embodiments of this disclosure provide a display device including a light-emitting substrate according to any one of the preceding claims. Attached Figure Description

[0029] To more clearly illustrate the technical solutions of the embodiments of this disclosure, the accompanying drawings of the embodiments will be briefly described below. Obviously, the drawings described below only relate to some embodiments of this disclosure and are not intended to limit this disclosure.

[0030] Figure 1 This is a schematic cross-sectional view of a light-emitting substrate.

[0031] Figure 2A This is a schematic diagram of the pad arrangement in a light-emitting substrate.

[0032] Figure 2B This is a schematic diagram of another pad arrangement in a light-emitting substrate.

[0033] Figure 3 This is a schematic diagram of a light-emitting element in a light-emitting substrate when it is tilted or shifted.

[0034] Figure 4 This is a top view of a light-emitting substrate provided in an embodiment of this disclosure.

[0035] Figure 5A yes Figure 4 A schematic cross-sectional view of the light-emitting substrate along line AB.

[0036] Figure 5B yes Figure 5A A schematic cross-sectional view of the light-emitting substrate along line CD.

[0037] Figure 5C This is a schematic diagram of a pad structure in a light-emitting substrate provided by an embodiment of the present disclosure.

[0038] Figure 5D This is a schematic diagram of a light-emitting element in a light-emitting substrate provided by an embodiment of the present disclosure.

[0039] Figure 5E This is a schematic diagram of a light-emitting element and a pad being configured in conjunction in a light-emitting substrate according to an embodiment of this disclosure.

[0040] Figure 5F This is a schematic diagram showing the displacement of a light-emitting element in a light-emitting substrate according to an embodiment of this disclosure.

[0041] Figure 6A This is a schematic diagram of the pad structure in another light-emitting substrate provided in an embodiment of this disclosure.

[0042] Figure 6B This is a schematic diagram of the pad structure in another light-emitting substrate provided in an embodiment of the present disclosure.

[0043] Figure 6C This is a schematic diagram of the pad structure in another light-emitting substrate provided in the embodiments of this disclosure.

[0044] Figure 6D This is a schematic diagram of the pad structure in another light-emitting substrate provided in the embodiments of this disclosure.

[0045] Figure 6E This is a schematic diagram of the pad structure in another light-emitting substrate provided in the embodiments of this disclosure.

[0046] Figure 6F This is a schematic diagram of the pad structure in another light-emitting substrate provided in the embodiments of this disclosure.

[0047] Figure 6G This is a schematic diagram of the pad structure in another light-emitting substrate provided in the embodiments of this disclosure.

[0048] Figure 6H This is a schematic diagram of the pad structure in another light-emitting substrate provided in the embodiments of this disclosure.

[0049] Figure 7 This is a schematic diagram of the pad structure in another light-emitting substrate provided in the embodiments of this disclosure.

[0050] Figure 8 This is a schematic diagram of a display device provided in an embodiment of the present disclosure. Detailed Implementation

[0051] To make the objectives, technical solutions, and advantages of the embodiments of this disclosure clearer, the technical solutions of the embodiments of this disclosure will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of this disclosure. Based on the described embodiments of this disclosure, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this disclosure.

[0052] Unless otherwise defined, the technical or scientific terms used in this disclosure shall have the ordinary meaning understood by one of ordinary skill in the art to which this disclosure pertains. The terms “first,” “second,” and similar terms used in this disclosure do not indicate any order, quantity, or importance, but are merely used to distinguish different components. Terms such as “comprising” or “including” mean that an element or object preceding the word encompasses the elements or objects listed following the word and their equivalents, without excluding other elements or objects.

[0053] The features such as "perpendicular," "parallel," and "identical" used in the embodiments of this disclosure include features in the strict sense of "perpendicular," "parallel," and "identical," as well as cases where "approximately perpendicular," "approximately parallel," and "approximately identical" include certain errors. Taking into account measurement and errors associated with the measurement of a specific quantity (i.e., limitations of the measurement system), they represent the acceptable deviation range for a specific value as determined by a person skilled in the art. The term "center" in the embodiments of this disclosure can include a position strictly located at the geometric center as well as a position approximately at the center within a small area surrounding the geometric center. For example, "approximately" can mean within one or more standard deviations, or within 10% or 5% of the value.

[0054] With the continuous development of micro LED display technology, optimizing display effects has become an inevitable trend. In order to improve the performance of display devices, some display products optimize circuit performance and optical effects by optimizing the fit dimensions of light-emitting elements in the light-emitting substrate and the structure of pads in the light-emitting substrate.

[0055] With the continuous development of new micro LED display technology,

[0056] Light-emitting elements are typically fixed to the substrate of the display device by reflow soldering.

[0057] In a complete soldering process, the solder undergoes preheating, holding, reflow soldering, and cooling in sequence. For example, the preheating stage prevents damage to components due to rapid high-temperature heating, and the solder activity can be enhanced during this stage. The main purpose of the holding stage is to stabilize the temperature of each component in the reflow oven to minimize temperature differences. This stage provides sufficient time for the temperature of larger components in the light-emitting substrate to become consistent with that of smaller components, and ensures that the flux in the solder fully volatilizes. Then, during the reflow soldering process, the temperature rises rapidly, the solder reaches a molten state, and the light-emitting element is bonded to the substrate. Finally, in the cooling stage, the temperature is cooled below the solidification temperature, causing the solder to solidify.

[0058] For example, the solder mentioned above can be solder paste, which is a paste made of solder powder, flux, and other additives. Solder paste has a certain viscosity at room temperature, which can initially adhere electronic components to the intended positions. At the soldering temperature, as the solvent and some additives evaporate, the solder paste can solder the components to be soldered to the printed circuit pads, forming a permanent connection.

[0059] Figure 1 This is a schematic cross-sectional view of a light-emitting substrate; Figure 2A This is a schematic diagram of a pad arrangement in a light-emitting substrate; Figure 2B This is a schematic diagram of another pad arrangement in a light-emitting substrate; Figure 3 This is a schematic diagram of a light-emitting element in a light-emitting substrate when it is tilted or shifted.

[0060] like Figure 1 As shown, the light-emitting substrate 10 includes a pad 110, a solder 105, and a light-emitting element 140, with the light-emitting element 140 disposed on the side of the solder 105 away from the pad 110.

[0061] refer to Figures 2A-2B A reflective layer 100 is provided on one side of the substrate. The reflective layer 100 includes an opening 111, but no reflective layer 100 is provided within the opening 111. A pad 110 is disposed within the area defined by the opening 111 of the reflective layer 100, and the orthographic projection of the pad 110 on the substrate at least partially overlaps with the orthographic projection of the opening 111 on the substrate. The pad 110 includes a first pad 1101 and a second pad 1102 disposed opposite to each other. For example, the first pad 1101 and the second pad 1102 may respectively correspond to two connecting electrodes in the light-emitting element, and the two connecting electrodes are electrically connected to each other, thereby causing the light-emitting element to emit light.

[0062] Typically, the pads 110 located within the opening 111 require certain processing steps, such as copper plating, to enhance the connection between the pads 110 and the connecting electrodes.

[0063] For example, such as Figure 2A The pads 110 shown are configured such that the reflective layer 100 has a boundary 112. In the first direction X, the maximum size of the opening 111 of the reflective layer 100 is substantially equal to the maximum size of the pads 110 in the first direction X.

[0064] The inventors of this disclosure discovered that if such a method is used... Figure 2A In the pad arrangement shown, since the reflective layer 100 and the pads 110 are positioned close together, during the copper plating process on the pads 110, some metal may seep into the nearby reflective layer 100 through the opening 111. If too much metal seeps into the reflective layer 100, it may conduct the first pad 1101 and the second pad 1102, potentially causing a short circuit or other malfunctions and affecting the light-emitting effect of the light-emitting element.

[0065] Therefore, the following can be adopted: Figure 2BThe pad arrangement shown is such that the maximum size of the opening 111 in the reflective layer 100 in the first direction X is larger than the size of the pad 110 in the first direction X, thereby creating a certain distance between the opening 111 of the reflective layer 100 and the pad 110 in the first direction X. This makes it difficult for metal to penetrate into the reflective layer 100 through the opening 111 during the processing of the pad 110 (e.g., copper plating), reducing the risk of "gold penetration."

[0066] However, in response to Figure 2B As shown in the pad arrangement, the size of the opening 111 has a significant impact on the performance of the entire light-emitting substrate 10. For example, if the size of the opening 111 is too large, the overall area of ​​the reflective layer 100 may be reduced, thereby weakening the light reflection effect of the reflective layer 100 and reducing the light emission efficiency of the light-emitting substrate 10; while if the size of the opening 111 is too small, the pad 22 may be too close to the surrounding reflective layer 100, thereby increasing the risk of "gold infiltration".

[0067] Furthermore, the inventors of this disclosure also note that, as Figure 1 As shown, after soldering, the solder 105 typically forms a flat area 160 at the contact portion (e.g., the electrode area) where it is soldered to the light-emitting element 140. When the flat area 160 is symmetrically (or substantially symmetrically) distributed with respect to the center line L, the light-emitting element 140 is also symmetrically (or substantially symmetrically) distributed with respect to the center line L, and in this case, the light-emitting element 140 shows no offset. However, when the solder pads use... Figure 2B In the setup shown, when the light-emitting element 140 is fixed to the pad 110 by reflow soldering, and the solder 105 melts into a liquid state, due to the lack of... Figure 2A The opening 111 of the reflective layer 100, as shown, restricts the flow of the solder 105. Under tension, the liquid solder 105 forms curved edge regions 150 on both sides of the flat region 160. Furthermore, under the influence of its own gravity and return airflow, the light-emitting element 140 is prone to irregularly shifting towards both sides of the center line L. When the light-emitting element 140 shifts to the curved regions 150 on both sides of the solder 105, the tilt of the light-emitting element 140 will be further aggravated.

[0068] Figure 3The diagram illustrates the situation when the light-emitting element 140 tilts or shifts as described above. For example, the tilt angle β of the light-emitting element 140 ranges from approximately 7 to 12°. Consequently, when multiple light-emitting elements 140 on the light-emitting substrate 10 tilt to different degrees simultaneously, the light emission angles of the light-emitting elements 140 will vary to different degrees. This results in different luminous intensities of the light-emitting elements 140 on the pad 110 in the third direction Z perpendicular to the substrate, which may lead to uneven brightness on the light-emitting substrate 10 under backlight conditions.

[0069] Based on this, embodiments of the present disclosure provide a light-emitting substrate, including a substrate, a reflective layer, at least one pad, a light-emitting element, and a connection portion. A reflective layer is disposed on a substrate, the reflective layer includes an opening, the maximum size of the opening in a first direction is H1; the orthographic projection of at least one pad on the substrate at least partially overlaps with the orthographic projection of the opening on the substrate; a light-emitting element is disposed on the substrate, the orthographic projection of the light-emitting element on the substrate at least partially overlaps with the orthographic projection of the opening on the substrate, and includes a first electrode and a second electrode; a connecting portion is disposed between the pad and the light-emitting element, configured to connect the pad and the light-emitting element, the connecting portion includes an edge arc region, the maximum size of the edge arc region in the first direction is M; the first electrode and the second electrode are spaced apart in a second direction, the second direction intersects the first direction, the maximum size of the first electrode or the second electrode in the first direction is a first size K1; at least one pad includes a first pad, the first pad includes a first size portion, the minimum distance between the first size portion and the opening in the first direction is a second size K2, the second size K2 satisfies: K2≤H1 / 2-1 / 2(K1+2M), and 50 μm≤H1-2K2-K1≤100 μm.

[0070] The light-emitting substrate provided in the embodiments of this disclosure can have a suitable distance between the pads in the light-emitting substrate and the edge of the opening of the reflective layer where they are located, so as to reduce the "gold penetration phenomenon" and reduce the risk of the light-emitting element disposed on the pads tilting, thereby optimizing the optical performance of the light-emitting substrate.

[0071] The light-emitting substrate and display device provided in the embodiments of this disclosure will now be described with reference to the accompanying drawings.

[0072] Figure 4 This is a top view of a light-emitting substrate provided in an embodiment of this disclosure; Figure 5A yes Figure 4 A schematic cross-sectional view of the light-emitting substrate along line AB; Figure 5B yes Figure 5A A schematic cross-sectional view of the light-emitting substrate along line CD. Figure 5C This is a schematic diagram of a pad structure in a light-emitting substrate provided by an embodiment of the present disclosure; Figure 5DThis is a schematic diagram of a light-emitting element in a light-emitting substrate provided by an embodiment of this disclosure; Figure 5E This is a schematic diagram of a light-emitting element and a pad being configured in conjunction in a light-emitting substrate according to an embodiment of this disclosure; Figure 5F This is a schematic diagram showing the displacement of a light-emitting element in a light-emitting substrate according to an embodiment of this disclosure.

[0073] refer to Figures 4-5D The present disclosure provides a light-emitting substrate 01, including a substrate 101, a reflective layer 100, at least one pad 201, a light-emitting element 102, and a connecting portion 105.

[0074] refer to Figures 4-5C A reflective layer 100 is disposed on a substrate 101. The reflective layer 100 is configured to reflect light incident upon it. The reflective layer 100 includes an opening 103, the maximum dimension of which in a first direction X is H1. The orthographic projection of at least one pad 201 on the substrate 101 at least partially overlaps with the orthographic projection of the opening 103 on the substrate 101. It should be noted that in the light-emitting substrate provided in the embodiments of this disclosure, the reflective layer 100 is not disposed within the area defined by the opening 103.

[0075] refer to Figures 4-5D The light-emitting element 102 is disposed on the substrate 101. The orthographic projection of the light-emitting element 102 on the substrate 101 at least partially overlaps with the orthographic projection of the opening 103 on the substrate 101, and includes a first electrode 202 and a second electrode 203. The connecting portion 105 is disposed between the pad 201 and the light-emitting element 102 and is configured to connect the pad 201 and the light-emitting element 102. The connecting portion 105 includes an edge curvature region 150, and the maximum dimension of the edge curvature region 150 in the first direction X is M.

[0076] For example, refer to Figure 4 , Figure 5D and Figure 5E The first electrode 202 and the second electrode 203 are spaced apart in the second direction Y, which intersects the first direction X. The maximum size of the first electrode 202 or the second electrode 203 in the first direction X is the first size K1. At least one pad 201 includes a first pad 204, which includes a first size portion 205. The minimum distance between the first size portion 205 and the opening 103 in the first direction X is the second size K2. The second size K2 satisfies: K2≤0.5H1-0.5(K1+2M), and 50 μm≤H1-2K2-K1≤100 μm.

[0077] For example, embodiments of this disclosure are described with the second direction Y intersecting the first direction X. The third direction Z is perpendicular to the first direction X and perpendicular to the second direction Y. For example, both the second direction Y and the first direction X are parallel to the main surface of the substrate 101, and the main surface of the substrate 101 is the surface on which pads are disposed. For example, the second direction Y is the direction in which two oppositely disposed pads are arranged on the substrate. The first direction X intersects the second direction Y; for example, the first direction X may form a certain angle with the second direction. Embodiments of this disclosure are described with the first direction X being perpendicular to the second direction Y.

[0078] The light-emitting substrate 01 provided in the embodiments of this disclosure can make the pads in the light-emitting substrate 01 have a suitable distance from the edge of the opening 103 of the reflective layer, so as to reduce the "gold penetration phenomenon" and reduce the risk of the light-emitting element 102 disposed on the pad 201 tilting, thereby optimizing the optical performance of the light-emitting substrate 01.

[0079] refer to Figures 4-5D The substrate 101 can be a printed circuit board (PCB) or a glass substrate. For example, the thickness of the substrate 101 can range from 0.4 μm to 3 μm, but is not limited to this. For example, the thickness of the substrate 101 can range from 0.35 μm to 2.5 μm, but is not limited to this. For example, the thickness of the substrate 101 can be 0.4 μm, 1 μm, 1.5 μm, 2 μm, or 3 μm.

[0080] For example, substrate 101 may also include a driving circuit (not shown in the figure), which may include thin-film transistors and signal lines, and is configured to drive light-emitting element 102 to emit light.

[0081] refer to Figures 4-5D A reflective layer 100 is disposed on the substrate 101, at least a portion of the boundary of the reflective layer 100 coincides with at least a portion of the boundary of the substrate 101, and the reflective layer 100 is provided with a plurality of openings 102. For example, the reflective layer 100 can reflect the light emitted by the light-emitting element 102 to increase the amount of light emitted by the light-emitting substrate 01 along the third direction Z perpendicular to the plane on which the substrate 101 is located, thereby improving the light emission efficiency of the light-emitting substrate 01.

[0082] Figure 4 The illustration shows a scenario where a portion of the boundary of the reflective layer 100 coincides with a portion of the boundary of the substrate 101. In some embodiments, the substrate 101 may also include a portion of its functional areas where the reflective layer 100 is not disposed, such as a region 104 configured for circuit bonding.

[0083] For example, the color of the reflective layer 100 can be selected from colors with excellent reflective properties, such as white.

[0084] For example, the material of the reflective layer 100 may include white oil, which may include resin (e.g., epoxy resin, polytetrafluoroethylene resin), titanium dioxide (chemical formula TiO2), and organic solvents (e.g., dipropylene glycol methyl ether), etc.; the material of the reflective layer 100 may also include silicone-based white glue. For example, when the material of the reflective layer 100 includes white oil or silicone-based white glue, a screen printing process can be used to print the white oil to form the reflective layer 100. For example, the thickness of the reflective layer 100 may range from 10 μm to 300 μm, for example, the thickness may be 10 μm, 50 μm, 80 μm, 155 μm, 200 μm, or 300 μm. Exemplarily, the reflective layer 11 can be formed by one or more screen printing processes.

[0085] For example, the reflective layer 100 can be formed by one or more screen printing processes. For example, when the reflective layer 100 is fabricated using multiple screen printing processes, the size of the opening in the reflective layer 100 can be different to improve the fabrication accuracy of the reflective layer 100 near the opening area, thus allowing the reflective layer 100 at the edge of the opening area to exhibit a stepped shape. For example, the reflective layer 100 can also have some compensation structures on the inner wall of its opening to compensate for the opening structure and improve the dimensional accuracy at the opening. For example, the compensation structure can be made of materials such as silicone-based white glue, so that its color is basically consistent with the color of the reflective layer 100, thereby having a certain reflective ability to light, or as close as possible to the reflectivity of the reflective layer 100 to light. This disclosure does not limit the form of the compensation structure.

[0086] For example, the reflective layer 100 can also be a reflective sheet, such as a white reflective sheet. For example, the reflective layer 100 can also be a reflective coating, etc. The embodiments of this disclosure do not limit the form of the reflective layer 100.

[0087] For example, the orthographic projection of the opening 103 in the reflective layer 100 onto the substrate 101 can be circular, triangular, or rectangular, etc. The embodiments of this disclosure do not limit the shape of the opening 103.

[0088] The embodiments of this disclosure employ a reflow soldering process to solder the light-emitting element 102 to the pad 201, ensuring that the orthographic projection area of ​​the opening 103 in the reflective layer 100 onto the substrate 101 is larger than the orthographic projection area of ​​the pad 201 onto the substrate 101. For example, the orthographic projection area of ​​the pad 201 onto the substrate 101 is completely surrounded by the orthographic projection area of ​​the opening 103 in the reflective layer 100 onto the substrate 101. Therefore, the pad 201 and the opening 103 can have a certain distance between them in the first direction X or the second direction Y, thereby reducing the risk of short circuits caused by "gold penetration".

[0089] For example, pad 201 can be made of a metal material, such as aluminum or copper.

[0090] refer to Figures 4-5D The maximum dimension of the opening 103 in the first direction X is H1, and the maximum dimension of the opening 103 in the second direction Y is greater than the maximum dimension H1 in the first direction X. Two pads 201 are arranged opposite to each other and spaced apart in the opening 103, with the second direction Y as the outgoing direction. The orthographic projection of the pads 201 on the substrate 101 overlaps with the orthographic projection of the two edges of the opening 103 on the substrate 101 in the second direction Y. In this case, the pads 201 are spaced apart from the opening 103 in the first direction X. In some embodiments of this disclosure, the orthographic projection of the opening 103 on the substrate 101 may also be of other shapes, and the two pads 201 may also have the first direction X as the outgoing direction, with the pads 201 spaced apart from the opening 103 in the second direction Y.

[0091] It should be noted that the outgoing direction of the light-emitting substrate in the embodiments of this disclosure refers to the routing direction of the signal lines used to connect the light-emitting elements in the light-emitting substrate. For example, in some embodiments of this disclosure, each pad can be part of a signal line, for example, each pad can be one end of a signal line. For example, two oppositely arranged pads can respectively serve as the two ends of two signal lines to conduct to the two connecting electrodes of the light-emitting element, causing the light-emitting element to emit light. For example, the outgoing direction can be the first direction X shown in the embodiments of this disclosure, or it can be the second direction Y. For example, in some embodiments of this disclosure, the outgoing direction can also be other directions intersecting the first direction X, which are not limited here.

[0092] Of course, in some embodiments of this disclosure, the pads can also be set separately, that is, each pad can be set as an independent conductive element on the substrate and connected to the light-emitting element through a signal line to drive the light-emitting element to emit light. The embodiments of this disclosure do not limit whether the pads and signal lines are formed integrally.

[0093] refer to Figures 4-5D The light-emitting element 102 also includes a light-emitting portion 302, disposed on the side of the first electrode 202 and the second electrode 203 away from the substrate 101, and configured to emit light within a corresponding wavelength range. Multiple light-emitting elements 102 are arranged in an array on the substrate 101 to form multiple rows and columns of light-emitting elements. Multiple columns of light-emitting elements are arranged sequentially in the first direction X, and the spacing between adjacent columns is substantially equal. This uniform arrangement of light-emitting elements makes the emitted light from the light-emitting substrate more uniform in brightness. Of course, the arrangement of the multiple light-emitting elements 102 is not limited to... Figure 4As shown, the spacing can be determined as needed. For example, the spacing between adjacent rows of light-emitting elements can be unequal, depending on the specific light-emitting requirements of the light-emitting substrate. The embodiments disclosed herein do not impose any limitations on this.

[0094] refer to Figures 5A-5D The light-emitting element 102 includes a first electrode 202 and a second electrode 203. The light-emitting element 102 is connected to the pad 201 through the first electrode 202 and the second electrode 203, thereby connecting to the driving circuit on the substrate 101 so that the light-emitting element 102 can emit light through the driving circuit.

[0095] For example, one of the first electrode 202 and the second electrode 203 is the P electrode of the light-emitting element 102, and the other of the first electrode 202 and the second electrode 203 is the N electrode of the light-emitting element 102.

[0096] For example, both the first electrode 202 and the second electrode 203 of the light-emitting element 102 are made of conductive materials. For example, one of the first electrode 202 and the second electrode 203 in the light-emitting element 102 is made of a metallic material, such as aluminum; the other of the first electrode 202 and the second electrode 203 in the light-emitting element 102 is made of a conductive oxide, such as indium tin oxide (ITO).

[0097] refer to Figures 5A-5E For example, the connecting portion 105 is solder. For instance, the connecting portion 105 may include solder paste, and the connection between the light-emitting element 102 and the pad 202 is achieved through a reflow soldering process. Based on the characteristics of the connecting portion 105, after being liquefied by heat, the connecting portion 105 will appear as a paste. Due to factors such as gravity, the first electrode 202 and the second electrode 203 of the light-emitting element 102 cause the connecting portion 105 to be compressed in the third direction Z. Thus, after cooling, the connecting portion 105 forms a flat area 160 in the contact area with the first electrode 202 or the second electrode 203, and edge curvature areas 150 are formed on both sides of the flat area 160. The edge curvature areas 150 are located on both sides of the flat area 160, and the edge curvature areas 150 include a maximum dimension M in the first direction X. The dimension N of the edge curvature areas 150 in the second direction Y is approximately the same as the maximum dimension of the flat area 160 in the second direction Y. For example, the size and shape of the edge curvature region 150 may vary depending on the amount of the connecting portion 105 and different states, thereby causing the maximum dimension M of the edge curvature region 150 in the first direction X to differ. For example, in some embodiments of this disclosure, the edge curvature regions 150 on both sides of the flat region 160 may have different dimensions, i.e., as shown in the figure. Figure 5B As shown, the maximum dimension M of the two edge arc regions 150 located on both sides of the flat region 160 in the first direction may not be equal to the maximum dimension Q.

[0098] For example, in some embodiments of this disclosure, the connecting portion 105 may have different dimensions in the third direction Z. For example, the dimensions of the connecting portion 105 in the second direction Y may also be different; for example, the edge curvature region 150 of the connecting portion 105 may have edges with different curvatures; for example, the shape of the edge curvature region 150 of the connecting portion 105 may not have any symmetry. Therefore, the dimensions of the edge curvature region 150 of the connecting portion 105 in the first direction X may vary to different degrees depending on the actual product structure or different environmental conditions, and the embodiments of this disclosure do not limit the state of the connecting portion 105.

[0099] refer to Figures 5C-5F When the light-emitting element 102 is configured to cooperate with the pad 201, the first electrode 202 or the second electrode 203 in the light-emitting element 102 does not completely overlap with its corresponding pad 201. That is, the orthographic projection of the first electrode 202 or the second electrode 203 on the substrate 101 does not completely overlap with the orthographic projection of its corresponding pad 201 on the substrate 101. For example, there may be a certain non-overlapping area 206 (such as...). Figure 5E (As shown). Pad 201 includes a first pad 204, and the first pad 204 includes a first dimensional portion 205.

[0100] For example, the minimum dimension of the first dimension portion 205 in the first direction X is greater than the maximum dimension K1 of the first electrode 202 or the second electrode 203 in the first direction X. For example, the minimum distance between the first dimension portion 205 and the opening 103 in the first direction X can be non-uniform, and 50 μm ≤ H1-2K2-K1≤100 μm, thereby providing the first dimension portion 205 with a flat area with a larger dimension in the first direction X for the first electrode 202 or the second electrode 203. Meanwhile, the minimum distance between the first dimension portion 205 and the opening 103 in the first direction X is the second dimension K2, which satisfies: K2≤0.5H1-0.5(K1+2M). For example, K2 can be 1 / 3-3 / 4 of 0.5H1-0.5(K1+2M); for example, K2 can be 1 / 3-2 / 3 of 0.5H1-0.5(K1+2M); for example, K2 can be 1 / 2-2 / 3 of 0.5H1-0.5(K1+2M); for example, K2 can be 1 / 5-1 / 2 of 0.5H1-0.5(K1+2M).

[0101] For example, refer to Figures 5A to 5EThe connection portion 105 disposed between the pad 201 and the first electrode 202 or the second electrode 203 will have an edge curvature region 150. For example, the maximum dimension M of the edge curvature region 150 in the first direction X can be in the range of 30~50μm. For the first dimension portion 205, the flat region 160 in the connection portion 105 has a larger dimension in the first direction X, and 50 μm ≤ H1-2K2-K1≤100 μm. Therefore, the provision of the first dimension portion 205 can achieve sufficient contact between the first electrode 202 or the second electrode 203 and the pad 202, thereby enhancing the connection effect.

[0102] Therefore, by setting the light-emitting substrate 01 in this way, the pads 201 and the surrounding reflective layer 100 can have an appropriate distance to reduce the risk of "gold infiltration". At the same time, it can also promote sufficient contact between the pads 201 and the first electrode 202 and the second electrode 203 on a larger flat area, improve the connection effect, reduce the probability of the light-emitting element 102 set on the pads 201 tilting, and thus optimize the optical performance of the light-emitting substrate 01.

[0103] For example, such as Figure 5C As shown, the first pad 204 also includes a second dimension portion 207. The maximum distance between the second dimension portion 207 and the opening 103 in the first direction X is a third dimension H2. The third dimension H2 satisfies: 0.5H1-0.6K1 ≤ H2 ≤ 0.5H1-0.4K1.

[0104] refer to Figures 5C-5E For the first pad 204, the second dimension portion 207 is disposed on the side of the first dimension portion 205 near the first centerline R1, and the average size of the second dimension portion 207 in the first direction X is smaller than the average size of the first dimension portion 205 in the first direction X. For example, the minimum size of the first dimension portion 205 in the first direction X can be equal to the size of the second dimension portion 207 in the first direction X. For example, when the orthographic projection of the light-emitting element 102 on the substrate 101 is a narrow rectangle, and the orthographic projection of the light-emitting element 102 on the substrate 101 at least partially overlaps with the orthographic projection of the opening 103 on the substrate 101, a non-overlapping area 206 can exist between the second dimension portion 207 of the first electrode 202 and the first pad 204, and the third dimension H2 satisfies: 0.5H1-0.6K1 ≤ H2 ≤ 0.5H1-0.4K1.

[0105] For example, the range of H1 can be 0.3μm - 0.4μm; for example, the range of H1 can be 0.32μm - 0.39μm; for example, the range of H1 can also be 0.35μm - 0.38μm. For example, the range of H2 can be 0.07μm - 0.12μm; for example, the range of H2 can be 0.08μm - 0.10μm; for example, the range of H2 can also be 0.05μm - 0.15μm.

[0106] Therefore, the second dimension portion 207 can further increase the distance between the first pad 204 and the opening 103 in the first direction X, which can further reduce the risk of "gold penetration".

[0107] At the same time, refer to Figures 5A-5F When the light-emitting element 102 is offset or tilted, the first electrode 202 or the second electrode 204 of the light-emitting element 102 may have a portion of its area deviating from the pad, i.e., the non-overlapping area 206 (e.g., Figure 5E (As shown). At this time, refer to Figure 5C By ensuring that the third dimension H2 satisfies: 0.5H1-0.6K1 ≤ H2 ≤ 0.5H1-0.4K1, the first electrode 202 or the second electrode 204 will contact the edge arc region 150 in the connecting portion 105 corresponding to the second dimension portion 207. This allows the first electrode 202 or the second electrode 204 to be subjected to the surface tension of the edge arc region 150 in the connecting portion 105 corresponding to the second dimension portion 207 when it shifts or tilts, thus resisting the tendency of the first electrode 202 or the second electrode 204 to shift or tilt due to factors such as backflow or gravity.

[0108] For example, when the third dimension H2 satisfies the above formula, the dimension of the second dimension portion 207 in the first direction X is smaller than the dimension of the first dimension portion 205 in the first direction X (except at the position where the first dimension portion 205 and the second dimension portion 207 are connected). Therefore, compared with the first dimension portion 205, the second dimension portion 207 corresponds to more edge curvature regions 150 that can contact the first electrode 202 or the second electrode 204, thereby allowing the first electrode 202 or the second electrode 204 to be subjected to greater surface tension generated by the edge curvature regions.

[0109] For example, such as Figure 5F As shown, during the welding process, when the light-emitting element 102 tilts or tends to tilt, the tension of the edge curvature region 150 in the connecting portion 105 corresponding to the second dimension portion 207 can correct the position of the light-emitting element 102, thereby reducing the portion of the light-emitting element 102 located in the offset region 213, until the connecting portion 105 reaches tension balance, allowing the light-emitting element 102 to be adjusted from the offset region 213. Figure 5FThe offset state shown has been restored or approximately restored to its original state. Figure 5E The normal state of the light-emitting element 102 is as follows: that is, under the action of tension, the edge curvature area 150 of the connecting portion 105 corresponding to the second size portion 207 can pull the light-emitting element 102 back to the center position or back to a position close to the center.

[0110] It should be noted that, Figure 5F The positional offset of the light-emitting element shown is merely exemplary. This state represents an intermediate situation that may occur during the installation process of the light-emitting substrate provided in the embodiments of this disclosure, and is not the final state. In some embodiments of this disclosure, for example, the possible offset of the light-emitting element may be related to... Figure 5F The offsets shown are not equal. For example, the direction of the possible offset of the light-emitting element may also be different from that shown. Figure 5F The directions of the offsets shown are not the same, and the embodiments disclosed herein do not limit this.

[0111] Therefore, by configuring the second dimension portion 207 in this way, the risk of "gold infiltration" can be further reduced, while the probability of the first electrode 202 or the second electrode 204 shifting or tilting can be effectively reduced.

[0112] For example, refer to Figures 5C to 5E At least one pad 201 further includes a second pad 208, the first pad 204 and the second pad 208 being spaced apart and relative to a first centerline R1 located between the first pad 204 and the second pad 208 (e.g., Figure 5C (As shown) symmetrical.

[0113] For example, such as Figure 5C As shown, the first centerline R1 extends along the first direction X. Figure 5C As shown, the first centerline R1 does not overlap with the first pad 204, nor with the second pad 208. Figure 5C As shown, the first pad 204, the first center line R1, and the second pad 208 are arranged sequentially in the second direction Y.

[0114] like Figure 5D As shown, the first electrode 202 and the second electrode 203 are symmetrically distributed with respect to the second center line R2 located between the first electrode 202 and the second electrode 203 of the light-emitting element 102.

[0115] like Figure 5D As shown, the second centerline R2 extends along the first direction X. Figure 5D As shown, the second centerline R2 does not overlap with the first electrode 202, nor with the second electrode 203. Figure 5D As shown, the first electrode 202, the second center line R2, and the second electrode 203 are arranged sequentially in the second direction Y.

[0116] For example, in embodiments of this disclosure, the first centerline R1 and the second centerline R2 are dummy lines and may not exist in the actual product. For example, in embodiments of this disclosure, components disposed on both sides of each centerline (e.g., the first pad 204 and the second pad 208 disposed on both sides of the first centerline R1, or the first electrode 202 and the second electrode 203 disposed on both sides of the second centerline R2) may not be strictly symmetrically arranged, i.e., they can be approximately symmetrical within a certain error range. For example, the symmetry error when each component is disposed on both sides of the centerline can be 3%-10%, and embodiments of this disclosure do not limit this. For example, refer to... Figure 5C and Figure 5E At least one pad 201 is disposed on the side of the first electrode 202 and the second electrode 203 near the substrate 101; the minimum distance between the first electrode 202 and the second electrode 203 in the second direction Y is the fourth dimension Z; the minimum distance between the first pad 204 and the second pad 208 in the second direction Y is the fifth dimension D, 0.9Z ≤ D ≤ Z, so that the light-emitting element 102 is not easily tilted or shifted under the tension of the connecting portion 105.

[0117] refer to Figures 5C to 5E The first pad 204 and the second pad 208 have the same shape and size when projected onto the substrate 101, and are symmetrically distributed with respect to the first center line R1. In some embodiments of this disclosure, the shape and size of the first pad 204 and the second pad 208 projected onto the substrate 101 may also be different, and this is not limited. In the second direction, the first pad 204 and the second pad 208 are spaced apart to avoid short circuits. For example, the value range of the fifth dimension D of the first pad 204 and the second pad 208 in the second direction Y may be 0.1μm-0.4μm; for example, the value range of the fifth dimension D may be 0.12μm-0.25μm; for example, the value range of the fifth dimension D may be 0.13μm-0.20μm. The first electrode 202 and the second electrode 203 are also distributed at intervals. For example, the value range of the fourth dimension Z of the first electrode 202 and the second electrode 203 in the second direction Y can be 0.1μm-0.3μm; for example, the value range of the fifth dimension D can be 0.12μm-0.20μm; for example, the value range of the fifth dimension D can be 0.13μm-0.15μm.

[0118] refer to Figures 5C to 5E When the light-emitting element 102 is disposed on the side of the pad 201 away from the substrate 101, the fourth dimension Z and the fifth dimension D satisfy the following condition: 0.9Z ≤ D ≤ Z, that is, the fifth dimension D is less than or equal to the fourth dimension Z.

[0119] For example, refer to Figures 5C to 5E The fifth dimension D is smaller than the fourth dimension Z, which allows the orthographic projection of the end of the first pad 204 near the first center line R1 on the substrate to include the portion not covered by the orthographic projection of the first electrode 202 on the substrate. For example... Figure 5E As shown, in the second direction Y, the first electrode 202 is farther away from the first centerline R1 than the first pad 204. Meanwhile, the dimensions of the first electrode 202 and the first pad 204 closer to the first centerline R1 in the first direction X are not significantly different. Figure 5E As shown, the size of the first electrode 202 in the first direction X is slightly smaller than the size of the first pad 204 in the first direction X. Therefore, the light-emitting element 102 is less likely to tilt or shift under the tension of the connecting portion 105, so that the light-emitting substrate 01 can have good optical performance.

[0120] For example, refer to Figures 5A-5E The maximum distance between the first dimension portion 205 and the first center line R1 in the second direction Y is the sixth dimension C1, and the minimum distance between the second dimension portion 207 and the first center line R1 in the second direction Y is the seventh dimension C2; the maximum distance between the first electrode 201 and the second center line R2 in the second direction Y is the eighth dimension Y1, where Y=MAX(C1,C2), which is beneficial to improve the setting effect of the light-emitting element 102 on the first pad 204, so as to reduce the probability of the light-emitting element 102 set on the pad being tilted or offset.

[0121] refer to Figures 5A-5E The first dimension portion 205 and the sixth dimension C1 of the first center line R1 in the second direction Y, and the second dimension portion 207 and the seventh dimension C2 of the first center line R1 in the second direction Y, satisfy Y=MAX(C1, C2). The difference between the sixth dimension C1 and the seventh dimension C2 is substantially equivalent to the dimension of the first electrode 202 or the second electrode 203 in the second direction Y. For example, the edge 214 of the first electrode 202 away from the second center line R2 is basically set at the end of the first dimension portion 205 of the first pad 204 near the first center line R1. In this way, the first dimension portion 205 can provide a larger setting area for the first electrode 202, so that the first electrode 202 can be set as much as possible on the flat area 160 of the connecting portion 105 in the direction away from the second center line R2 in the second direction Y. This is beneficial to improving the setting effect of the light-emitting element 102 on the first pad 204, thereby reducing the probability of the light-emitting element 102 set on the pad being tilted or offset.

[0122] In order to achieve an appropriate spacing between the pads and the surrounding reflective layer, reduce the risk of "gold infiltration", and effectively prevent the light-emitting elements set on the pads from tilting or shifting, thereby optimizing the optical performance of the light-emitting substrate, the pads in the embodiments of this disclosure can be set in various forms according to actual design requirements.

[0123] For example, refer to Figures 5A-5C In the second direction Y, the maximum distance between the edge of the first pad 204 away from the second pad 208 and the edge of the second pad 208 away from the first pad 204 is equal to the maximum size of the opening 103; the first size portion 205 and the second size portion 207 respectively include a first end 209 and a second end 210 opposite to each other, and the first end 209 of the first size portion 205 is closer to the first center line R1 than the second end 210 of the first size portion 205, and the first end 211 of the second size portion 207 is closer to the first center line R1 than the second end 212 of the second size portion 207.

[0124] refer to Figures 5A-5C The maximum distance between the edge of the first pad 204 away from the second pad 208 and the edge of the second pad 208 away from the first pad 204 is equal to the maximum size of the opening, and both are C3. The pad 201 configured in this manner has its outgoing direction in the second direction Y, and the pad 201 and the opening 103 are spaced apart in the first direction X. For example, the first end of the first size portion 205 or the second size portion 207 is the edge of the first size portion 205 or the second size portion 207 near the first center line R1, and the second end of the first size portion 205 or the second size portion 207 is the edge of the first size portion 205 or the second size portion 207 away from the first center line R1, thereby making the first end of the first size portion 205 or the second size portion 207 closer to the first center line R1 than the second end. For example, in some embodiments of this disclosure, the edge of the orthographic projection of the first size portion 205 or the second size portion 207 onto the substrate 101 can be non-straight, for example, it can include an arc line, etc., and this is not limited.

[0125] For example, refer to Figures 5A-5C In the first direction X, the minimum distance between the first dimension portion 205 and the opening 103 is the second dimension K2, and the maximum distance between the first end 211 of the second dimension portion 207 and the opening is the third dimension H2.

[0126] refer to Figures 5A-5CThe first pad 204 includes a first dimension portion 205 and a second dimension portion 207 connected together. The first dimension portion 205 is disposed at the end of the second dimension portion 207 away from the first center line R1. In some embodiments of this disclosure, depending on the actual pad design requirements, while ensuring electrical connection between the first dimension portion 205 and the second dimension portion 207, a certain gap may also exist between the first dimension portion 205 and the second dimension portion 207, and the size and shape of this gap are not limited in the embodiments of this disclosure.

[0127] For example, such as Figure 5C In addition to the first size portion 205 and the second size portion 207, the first pad 204 may also include other portions, such as a third connecting portion 2171, to electrically connect the first pad 204 to a circuit structure other than the opening 103. For example, the dimension of the third connecting portion 2171 in the second direction may be smaller than the dimension of the first size portion 207 in the second direction; for example, the dimension of the third connecting portion 2171 in the first direction may be larger than the dimension of the first size portion 207 in the first direction, thereby further expanding the range of the flat area 160 in the connecting portion 105 to enhance the stability of the light-emitting element 102 disposed on the side of the first pad 204 away from the substrate 101.

[0128] refer to Figures 5A-5C In the second direction Y, as the first dimension portion 205 extends from the first end 209 to the second end 210, its size gradually increases in the first direction X, and the distance between the first dimension portion 205 and the opening 103 gradually decreases in the first direction X. At this time, the distance between the first end 209 of the first dimension portion 205 and the opening 103 in the first direction X is the largest relative to the other parts of the first dimension portion 205. The second dimension portion 207 has similar shape features to the orthographic projection of the first dimension portion 205 onto the substrate 101; therefore, the distance between the first end 211 of the second dimension portion 207 and the opening 103 in the first direction X is also the largest relative to the other parts of the second dimension portion 207. In the first pad 204, the size of the first end 211 of the second dimension portion 207 in the first direction X is the smallest. Thus, the first pad 204 of this structure can maintain a certain distance from the opening 103, reducing the occurrence of "gold penetration". The first dimension portion 205 can be disposed on the side of the second dimension portion 207 away from the first center line R1, and the connecting portion 105 disposed thereon can have a large flat area 160, thereby reducing the risk of the light-emitting element 102 shifting.

[0129] For example, such as Figure 5C As shown, the orthographic projections of the first dimension portion 205 and the first dimension portion 207 on the substrate 101 can both be trapezoidal.

[0130] Figure 6A This is a schematic diagram of a pad structure in another light-emitting substrate provided by an embodiment of this disclosure; Figure 6B This is a schematic diagram of the pad structure in another light-emitting substrate provided in an embodiment of the present disclosure; Figure 6C This is a schematic diagram of the pad structure in another light-emitting substrate provided in the embodiments of this disclosure; Figure 6D This is a schematic diagram of the pad structure in another light-emitting substrate provided in the embodiments of this disclosure; Figure 6E This is a schematic diagram of the pad structure in another light-emitting substrate provided in the embodiments of this disclosure; Figure 6F This is a schematic diagram of the pad structure in another light-emitting substrate provided in the embodiments of this disclosure; Figure 6G This is a schematic diagram of the pad structure in another light-emitting substrate provided in the embodiments of this disclosure; Figure 6H This is a schematic diagram of the pad structure in another light-emitting substrate provided in the embodiments of this disclosure; Figure 7 This is a schematic diagram of the pad structure in another light-emitting substrate provided in the embodiments of this disclosure.

[0131] For example, refer to Figure 5A and Figure 6A The orthographic projection of the first dimension portion 205 on the substrate 101 can also be rectangular, and the dimension of the first dimension portion 205 in the first direction X is greater than the dimension of the first dimension portion 205 in the second direction Y. The orthographic projection of the second end 210 of the first dimension portion 205 on the substrate 101 overlaps with the orthographic projection of the opening 103 on the substrate 101. The orthographic projection of the second dimension portion 207 on the substrate 101 can be trapezoidal, and includes an upper base 215 and a lower base 216 parallel to the first center line R1. The distance between the upper base 215 and the opening 103 in the first direction X is greater than the distance between the lower base 216 and the opening 103 in the first direction X. Figure 6A As shown, the length of the upper base 215 is less than the length of the lower base 216.

[0132] refer to Figure 5A and Figure 6A In the first direction X, both the first size portion 205 and the second size portion 207 are spaced apart from the opening 103, and the distance between the first size portion 205 and the opening 103 in the first direction X is generally smaller than the distance between the second size portion 207 and the opening 103 in the first direction X. As a result, the first pad 204 can reduce the risk of "gold penetration".

[0133] refer to Figure 5A , Figure 5B and Figure 6AThe upper bottom 215 of the second size portion 207, which is a trapezoid in orthographic projection on the substrate 101, is the first end 211, and the lower bottom 216 of the second size portion 207 is the second end 212. The distance between the upper bottom 215 and the opening 103 in the first direction X is greater than the distance between the lower bottom 216 and the opening 103 in the first direction X. Therefore, the upper bottom 215 corresponds to more edge arc areas 150 that can contact the first electrode 202 or the second electrode 204. This allows the first electrode 202 or the second electrode 204 to be subjected to greater tension generated by the edge arc areas 150, thereby limiting the displacement of the light-emitting element 102 and enhancing the optical performance of the light-emitting substrate 01.

[0134] Here, the principle of avoiding "gold seepage" and enhancing the optical performance of the light-emitting substrate by reasonably setting the first pad 204 can be found in the relevant description in the above embodiments, and will not be repeated here.

[0135] For example, refer to Figure 5A and Figure 6B The orthographic projections of the first dimension portion 205 and the second dimension portion 207 on the substrate 101 are both rectangles. The dimension of the first dimension portion 205 in the first direction X is greater than the dimension of the first dimension portion 205 in the second direction Y; the dimension of the second dimension portion 207 in the first direction X is greater than the dimension of the second dimension portion 207 in the second direction Y.

[0136] For example, refer to Figure 5A and Figure 6B The first pad 204 also includes a third dimension portion 217, which includes a first end 218 and a second end 219 opposite to each other. In the second direction Y, the first end 218 of the third dimension portion 217 is connected to the second end 210 of the first dimension portion 205. The orthographic projection of the second end 219 of the third dimension portion 217 on the substrate 101 overlaps with the orthographic projection of the opening 103 on the substrate 101. The size of the third dimension portion 217 in the second direction Y is smaller than the size of the first dimension portion 205 in the second direction Y.

[0137] For example, refer to Figure 5A and Figure 6B Compared to Figure 6A The pads shown Figure 6BThe pads shown have a third dimension 217 added. The orthographic projection of the second dimension 207 onto the substrate 101 is rectangular, and the second end 212 of the second dimension 207 has a smaller dimension in the first direction X than the first end 209 of the first dimension 205 in the first direction X. The first dimension 205 has a larger dimension in the second direction Y than the dimensions of the second dimension 207 and the third dimension 217 in the second direction Y. This allows the connection portion 105 on the side of the first dimension 205 away from the substrate 101 to have a larger flat area 160, thereby facilitating the connection between the pad 201 and the first electrode 202 and the second electrode 203 (see reference). Figure 5B Sufficient contact is made on the larger flat area 160 to form an effective connection, thereby reducing the light-emitting element 102 (reference) disposed on the pad 201. Figure 5B This reduces the probability of tilting, thereby optimizing the optical performance of the light-emitting substrate 01.

[0138] The third dimension portion 217 has a smaller dimension in the first direction X. For example, the dimension of the third dimension portion 217 in the first direction X can be smaller than the dimensions of the first dimension portion 205 and the third dimension portion 217 in the first direction. Furthermore, the smaller dimension of the third dimension portion 217 in the first direction X compared to the first dimension portion 205 in the first direction X can further reduce the risk of "gold infiltration". The embodiments of this disclosure do not limit the shape of the orthographic projection of the third dimension portion 217 on the substrate 101. For example, the orthographic projection of the third dimension portion 217 on the substrate 101 can be a regular polygon; for example, the orthographic projection of the third dimension portion 217 on the substrate 101 can also include an arc-shaped structure.

[0139] For example, refer to Figure 5A and Figure 6C The size of the second size portion 207 in the first direction X can gradually increase from the first end 211 to the second end 212 of the second size portion 207, and the size of the second end 212 of the second size portion 207 in the first direction X is equal to the size of the first end 209 of the first size portion 205 in the first direction X.

[0140] Compared to Figure 6B The pads shown Figure 6C The second dimension portion 207 in the pad shown has an irregular arc-shaped structure when projected onto the substrate 101, while the rest of the structure is the same.

[0141] refer to Figure 5A and Figure 6CThe size of the second size portion 207 in the first direction X gradually increases from the first end 211 to the second end 212 until it is equal to the size of the first end 209 of the first size portion 205 in the first direction X. For example, in some embodiments of this disclosure, by designing the size of the second size portion 207 in the first direction X as a gradient, the portion of the connecting portion 105 on the side of the second size portion 207 away from the substrate 101 can be well connected with the portion of the connecting portion 105 on the side of the first size portion 205 away from the substrate 101. This allows the flat area 150 in the connecting portion 105 to be larger, thereby optimizing the placement effect of the light-emitting element 102 and reducing the probability of the light-emitting element 102 shifting or tilting.

[0142] Of course, the embodiments disclosed herein are not limited thereto. For example, provided that the function of the pad can be realized, the shape of the orthographic projection of the second dimension portion 207 on the substrate 101 can be designed in various ways according to actual design requirements, and there is no limitation thereto.

[0143] For example, refer to Figure 5A and Figure 6D In the first direction X, the minimum distance between the first end 209 of the first dimension portion 205 and the opening 103 is the second dimension K2, the maximum distance between the first end 211 of the second dimension portion 207 and the opening 103 is the third dimension H2, and the orthographic projection of the second end 212 of the second dimension portion 207 on the substrate 101 overlaps with the orthographic projection of the opening 103 on the substrate 103.

[0144] refer to Figure 5A and Figure 6D The first dimension portion 205 is disposed on the side of the second dimension portion 207 near the first center line R1. Therefore, in the first direction X, the size of the first pad 204 decreases from the end near the first center line R1 to the end away from the first center line R1. When the light-emitting element 102 is disposed on the side of the first pad 204 away from the substrate 101, the second dimension portion 207 will restrict the portion of the light-emitting element 102 away from the first center line R1 from shifting or tilting; the first dimension portion 205 will act on the portion of the light-emitting element 102 near the first center line R1, and the connecting portion 105 will provide a larger flat area 150 for the light-emitting element 102. In addition, the pad structure provided in this way can also reduce the "gold penetration phenomenon".

[0145] For example, such as Figure 6DAs shown, the orthographic projection of the first dimension portion 205 on the substrate 101 can be a rectangle, and the size of the first dimension portion 205 in the first direction X is greater than the size of the first dimension portion 205 in the second direction Y; the orthographic projection of the second dimension portion 207 on the substrate 101 can also be a rectangle, and the size of the second dimension portion 207 in the first direction X is smaller than the size of the first dimension portion X in the second direction Y; the first dimension portion X and the second dimension portion 207 are connected.

[0146] like Figure 6D As shown, the orthographic projections of the first dimension portion 205 and the second dimension portion 207 on the substrate 101 are both rectangles, thereby the dimension of the first pad 204 in the first direction X decreases in a stepped manner from the end near the first center line R1 to the end away from the first center line R1. For example, the dimension of the second dimension portion 207 in the first direction X can also be the same as... Figure 6D The states shown are not the same. For example, refer to Figure 5A and Figure 6D When the probability of the light-emitting element 102 tilting or shifting is high, the size of the second size portion 207 in the second direction Y can be relatively increased, and the size of the first size portion 205 in the second direction Y can be relatively decreased, thereby enhancing the limiting effect on the possible tilting or shifting of the light-emitting element 102.

[0147] like Figure 6D As shown, in the second direction Y, the first dimension portion 205 and the second dimension portion 207 are directly adjacent to each other and are directly connected through the second end 210 of the first dimension portion 205 and the first end 211 of the second dimension portion 207. For example, in some embodiments of this disclosure, the first dimension portion 205 may also be indirectly connected to the second dimension portion 207. For example, other structures of the first pad 204 may also be provided between the first dimension portion 205 and the second dimension portion 207, which is not limited in the embodiments of this disclosure.

[0148] For example, refer to Figure 5A and Figure 6EThe first pad 204 also includes a third dimension portion 217, which includes a first end 218 and a second end 219 opposite to each other. In the second direction Y, the first end 218 of the third dimension portion 217 is connected to the second end 210 of the first dimension portion 205, and the second end 219 of the third dimension portion 217 is connected to the first end 211 of the second dimension portion 207. The dimension of the third dimension portion 217 in the first direction X gradually decreases from the first end 218 to the second end 219. The dimension of the first end 218 of the third dimension portion 217 in the first direction X is equal to the dimension of the second end 210 of the first dimension portion 205 in the first direction X, and the dimension of the second end 219 of the third dimension portion 217 in the first direction X is equal to the dimension of the first end 211 of the second dimension portion 207 in the first direction X.

[0149] refer to Figure 5A , Figure 5B and Figure 6E In the second direction Y, a third dimension portion 217 is disposed between the first dimension portion 205 and the second dimension portion 207, and the first dimension portion 205, the second dimension portion 207, and the third dimension portion 217 are electrically connected. For example, the first dimension portion 205, the second dimension portion 207, and the third dimension portion 217 may be integrally formed. The dimension of the third dimension portion 217 in the first direction X gradually decreases from the first end 218 of the third dimension portion 217 to the second end 219 of the third dimension portion 217, thereby serving as a transition zone for the dimensional change of the first dimension portion 205 and the second dimension portion 207 in the first direction X. Compared to Figure 6D The pad structure shown is as follows. Figure 6E The pad structure shown allows the connecting portion 105 on the side away from the substrate 101 in the first size portion 205 and the third size portion 217 to have a larger flat area 160, thereby optimizing the setting state of the light-emitting element 102, reducing the probability of the light-emitting element 102 tilting, and thus optimizing the optical performance of the light-emitting substrate 01.

[0150] For example, refer to Figure 5A and Figure 6E The orthographic projection of the third dimension portion 217 on the substrate 101 can be trapezoidal.

[0151] For example, test Figure 5A and Figure 6EThe orthographic projection of the third dimension portion 217 onto the substrate 101 can also be of other shapes. For example, the orthographic projection of the third dimension portion 217 onto the substrate 101 includes a first boundary 220 and a second boundary 221. For example, the first boundary 220 and the second boundary 221 of the orthographic projection of the third dimension portion 217 onto the substrate 101 can be straight lines, curves, or arcs, thereby the third dimension portion 217 can have various structural forms, and the embodiments disclosed herein are not limited in this regard.

[0152] For example, such as Figure 6F As shown, in the first direction X, the maximum size of the second end 210 of the first size portion 205 is equal to the maximum size of the first end 211 of the second size portion 207, and the second end 210 of the first size portion 205 is connected to the first end 211 of the second size portion 207; the maximum size of the first size portion 205 in the first direction X gradually decreases from the first end 209 of the first size portion 205 to the second end 210 of the first size portion 205.

[0153] For example, such as Figure 6F As shown, the first pad 204 also includes a third dimension portion 217, which includes a first end 218 and a second end 219 opposite to each other. In the second direction Y, the second end 219 of the third dimension portion 217 is mated with the first end 209 of the first dimension portion 205. The maximum dimension of the third dimension portion 217 in the first direction X gradually decreases from the first end 218 of the third dimension portion 217 to the second end 219 of the third dimension portion 217.

[0154] For example, refer to Figure 5A and Figure 6F The first pad 204 includes a first-sized portion 205, a second-sized portion 207, and a third-sized portion 217. In the second direction Y, the third-sized portion 217, the first-sized portion 205, and the second-sized portion 207 are sequentially arranged. The third-sized portion 217 is located on the side of the first-sized portion 205 closest to the first center line R1, and the second-sized portion 207 is located on the side of the first-sized portion 205 furthest from the first center line R1. The orthographic projection of the second end 212 of the second-sized portion 207 onto the substrate 101 overlaps with the orthographic projection of the opening 103 onto the substrate 101. For example, the size of the second-sized portion 207 in the first direction X can be uniform or non-uniform; this is not limited in the embodiments of this disclosure. For example, the size of the first end 211 of the second-sized portion 207 in the first direction X can be equal to or unequal to the size of the second end 210 of the first-sized portion 205; this is not limited in the embodiments of this disclosure, provided that electrical connection between the two is satisfied. The size of the first dimension portion 205 in the first direction X may be non-uniform, and in the second direction Y, the size of the first dimension portion 205 gradually decreases from the first end 209 to the second end 210.

[0155] For example, refer to Figure 5A and Figure 6F The orthographic projection of the first dimension portion 205 onto the substrate 101 can be a regular polygon or it can include an irregular shape, and this disclosure does not limit it. For example, the third dimension portion 217 has similar shape features to the orthographic projection of the first dimension portion 205 onto the substrate 101.

[0156] For example, refer to Figure 5A and Figure 6F The orthographic projection of the first dimension portion 205 on the substrate 101 can be trapezoidal, and the orthographic projection of the third dimension portion 217 on the substrate 101 can also be trapezoidal.

[0157] like Figure 6F As shown, the dimension of the second end 219 of the third dimension portion 217 in the first direction X is equal to the dimension of the first end 209 of the first dimension portion 205 in the first direction X, and the angles between the first end 209 of the first dimension portion 205 and its two sides are equal. The angle between the first end 218 of the third dimension portion 217 and its two sides is also equal, and equal to the angle between the first end 209 of the first dimension portion 205 and its two sides. For example, in some embodiments of this disclosure, the angle between the first end 209 of the first dimension portion 205 and its two sides may not be equal. For example, the slope of the two sides of the slope of the first end 218 of the third dimension portion 217 may also be the same as the slope of the two sides of the slope of the first end 209 of the first dimension portion 205. For example, the dimension of the second end 219 of the third dimension portion 217 in the first direction X may also not be equal to the dimension of the first end 209 of the first dimension portion 205 in the first direction X, and the embodiments of this disclosure do not limit this.

[0158] With this configuration, the flat area 160 of the connecting portion 105 can be further expanded through the third dimension portion 217. This reduces the probability of "gold infiltration" and optimizes the setting state of the light-emitting element 102, thereby reducing the probability of the light-emitting element 102 tilting and optimizing the optical performance of the light-emitting substrate 01.

[0159] For example, refer to Figure 5A and Figure 6G Compared to Figure 6F The pad structure shown is as follows. Figure 6G The connection side 291 between the orthographic projection of the first end 209 of the first dimension portion 205 on the substrate 101 and the orthographic projection of the first end 211 of the second dimension portion 207 on the substrate 101 is arc-shaped, and the orthographic projection of the first end 218 of the third dimension portion 217 on the substrate 101 is arc-shaped.

[0160] For example, refer to Figure 5A and Figure 6G The connection side 291 between the orthographic projection of the first end 209 of the first dimension portion 205 on the substrate 101 and the orthographic projection of the first end 211 of the second dimension portion 207 on the substrate 101 includes a first side 2911 and a second side 2912, and the orthographic projections of the first side 2911 and the second side 2912 on the substrate 101 are both arc-shaped. The maximum dimension of the third dimension portion 217 in the second direction Y is substantially equal to the maximum dimension of the first dimension portion 205 in the second direction Y. The third dimension portion 217 is electrically connected to the first dimension portion 205, and their orthographic projections on the substrate 101 form an ellipse. The second end 219 of the third dimension portion 217 and the first end 209 of the first dimension portion 205 achieve good alignment, thereby helping to increase the flat area 160 range of the connection portion 105 to optimize the setting state of the light-emitting element 102 and reduce the probability of the light-emitting element 102 tilting.

[0161] For example, in some embodiments of this disclosure, the curvature of the first side portion 2911 and the second side portion 2912 may be different, and the first side portion 2911 and the second side portion 2912 may not be symmetrical. For example, depending on actual design requirements, the dimension of the third dimension portion 217 in the second direction Y may not be equal to the dimension of the first dimension portion 205 in the second direction Y. For example, the dimension of the first dimension portion 205 in the second direction Y may be larger than the dimension of the third dimension portion 217 in the second direction Y.

[0162] Of course, the embodiments disclosed herein are not limited to this. The orthographic projection of the first dimension portion 205 or the third dimension portion 217 on the substrate 101 may also be other shapes, which are not limited here.

[0163] For example, such as Figure 6H As shown, in the first direction X, the minimum distance between the first end 209 of the first dimension portion 205 and the opening 103 is the second dimension K2, the maximum distance between the first end 211 of the second dimension portion 207 and the opening 103 is the third dimension H2, and the second end 210 of the first dimension portion 205 is connected to the first end 211 of the second dimension portion 207.

[0164] For example, refer to Figure 5A and Figure 6HThe first pad 204 also includes a third dimension portion 217 and a fourth dimension portion 222. Both the third dimension portion 217 and the fourth dimension portion 222 include opposing first and second ends. In the second direction Y, the first end 218 of the third dimension portion 217 is connected to the second end 212 of the second dimension portion 207. The orthographic projection of the second end 219 of the third dimension portion 217 on the substrate 101 overlaps with the orthographic projection of the opening 103 on the substrate 103. The second end 224 of the fourth dimension portion 222 is connected to the first end 209 of the first dimension portion 205. The dimension of the third dimension portion 217 in the first direction X gradually decreases from the first end 218 to the second end 219. The dimension of the fourth dimension portion 222 in the first direction X gradually decreases from the first end 223 to the second end 224. The dimension of the second end 224 of the fourth dimension portion 222 in the first direction X is equal to the dimension of the first end 209 of the first dimension portion 205 in the first direction X.

[0165] refer to Figure 5A and Figure 6H The first pad 204 includes a first-sized portion 205, a second-sized portion 207, a third-sized portion 217, and a fourth-sized portion 222. In the second direction Y, the fourth-sized portion 222, the first-sized portion 205, the second-sized portion 207, and the third-sized portion 217 are sequentially arranged, with the fourth-sized portion 222 having the smallest distance from the first central symmetry line R1. The size of the first-sized portion 205 increases sequentially from the first end 209 to the second end 210 and the opening 103 in the first direction X. The fourth-sized portion 222 connects to the first end 209 of the first-sized portion 205 at the second end 224. This allows for a further expansion of the flat area 160 of the connecting portion 105, thereby enhancing the stability of the first pad 204 on the side of the light-emitting element 102 disposed away from the substrate 105 and reducing the probability of tilting or shifting.

[0166] For example, refer to Figure 5A , Figure 5D and Figure 6HThe third dimension portion 217 gradually decreases in size from its first end 218 to its second end 219 in the first direction X, and is connected to the second end 212 of the second dimension portion 207 via its first end 218. The average size of the third dimension portion 217 in the first direction X is smaller than the average size of the second dimension portion 207 in the first direction X. Therefore, when the first electrode 202 in the light-emitting element 102 is disposed on the side of the first pad 204 away from the substrate 101, the edge 214 of the first electrode 202 extending along the first direction X away from the second center line R2 is located near the first end 218 of the third dimension portion 217. Thus, in the first pad 204 configured in this way, the third dimension portion 217 can further enhance the ability to limit the displacement of the light-emitting element 102, optimizing the optical performance of the light-emitting element 102.

[0167] For example, such as Figure 6H As shown, the orthographic projections of the first dimension portion 205, the second dimension portion 207, the third dimension portion 217, and the fourth dimension portion 222 on the substrate 101 are all trapezoidal.

[0168] For example, refer to Figure 5A , Figure 5D and Figure 6H In some embodiments of this disclosure, the orthographic projections of the first dimension portion 205, the second dimension portion 207, the third dimension portion 217, and the fourth dimension portion 222 onto the substrate 101 may also be other shapes. For example, the connecting side portions of the first dimension portion 205, the second dimension portion 207, the third dimension portion 217, and the fourth dimension portion 222 that connect their respective first and second ends may be straight lines or curves. For example, the connecting side portions of the first dimension portion 205, the second dimension portion 207, the third dimension portion 217, and the fourth dimension portion 222 that connect their respective first and second ends may include broken lines or arcs, etc., and the embodiments of this disclosure do not limit this.

[0169] For example, refer to Figure 5A and Figure 6H The dimensions of the first dimension portion 205, the second dimension portion 207, the third dimension portion 217, and the fourth dimension portion 222 in the second direction Y can be set according to actual design requirements. For example, the dimension of the first dimension portion 205 in the second direction Y can be increased to enhance the flat area 160 range of the connection portion 105 located on the side away from the substrate 101. As a result, the structure of the first pad 204 can be set more flexibly, thereby achieving better optimization of the optical performance of the light-emitting element 102.

[0170] For example, such as Figure 7As shown, in the first direction X, the maximum size of the first size portion 205 is equal to the maximum size of the opening 103; the first size portion 205 and the second size portion 207 respectively include a first end and a second end opposite to each other, and the first end 209 of the first size portion 205 and the first end 211 of the second size portion 207 are disposed on the side close to the first center line R1; the minimum distance between the second end 210 of the first size portion 205 and the opening 103 in the second direction Y is substantially equal to the size of the first size portion 205 in the second direction Y.

[0171] like Figure 7 As shown, the maximum dimension of the first dimension portion 205 in the first direction X is equal to the maximum dimension of the opening 103 in the first direction X, and the second dimension portion 207 is disposed on the side of the first dimension portion 205 in the second direction Y that is away from the first centerline R1. Therefore, Figure 7 The first pad 204 shown has a lead-out direction of the first direction X. Therefore, the first pad 204 designed according to this lead-out method maintains a certain distance from the opening 103 in the second direction Y to prevent the occurrence of "gold penetration".

[0172] refer to Figures 5A-5E The sixth dimension C1 of the first dimension portion 205 and the first center line R1 in the second direction Y, and the seventh dimension C2 of the second dimension portion 207 and the first center line R1 in the second direction Y, satisfy Y1=MAX(C1, C2). The difference between the sixth dimension C1 and the seventh dimension C2 is substantially equivalent to the dimension of the first electrode 202 or the second electrode 203 in the second direction Y. Therefore, when this design condition is met, the dimension of the first dimension portion 205 in the second direction Y can be determined according to the actual design situation, and the embodiments of this disclosure do not limit this.

[0173] For example, such as Figure 7 As shown, the minimum distance between the second end 210 of the first dimension portion 205 and the opening 103 in the second direction Y can be substantially equal to the dimension of the first dimension portion 205 in the second direction. Therefore, while the connecting portion 105 on the side of the first dimension portion 205 away from the substrate can have a larger flat area, the overall area of ​​the first pad 204 can be saved, thereby reducing manufacturing costs.

[0174] Of course, the embodiments disclosed herein are not limited to the structural form when the outgoing line direction of the first pad 204 is the first direction X. Furthermore, a third dimension portion and / or a fourth dimension portion may be added to the first pad 204 according to actual design requirements. Simultaneously, the structural form of each dimension portion can be determined according to actual conditions, thereby making the design of the first pad 204 more flexible and enabling better optimization of the optical performance of the light-emitting element.

[0175] For example, such as Figure 7 As shown, the size of the first size portion 205 in the first direction X is greater than the size of the first size portion 205 in the second direction Y; the size of the second size portion 207 in the second direction Y gradually increases from the first end 211 to the second end 212 of the second size portion 207.

[0176] For example, the orthographic projection of the first dimension portion 205 on the substrate 101 can be a rectangle, and the orthographic projection of the second dimension portion 207 on the substrate 101 can be a trapezoid.

[0177] For example, refer to Figure 5D and Figure 7 The distance between the first end 211 of the second dimension portion 207 and the opening 103 in the first direction X is H2, and the third dimension H2 satisfies: H1 / 2-0.6K1 ≤ H2 ≤ H1 / 2-0.4K1. Therefore, the dimension of the first electrode 202 in the first direction X is close to the dimension of the first end 211 of the second dimension portion 207 near the first center line R1 in the first direction X. Therefore, the first pad 204 with this structure can limit the light-emitting element 102 from shifting or tilting.

[0178] like Figure 7 As shown, the size of the second dimension portion 207 in the second direction Y gradually increases from the first end 211 to the second end 212, and the second end 212 of the second dimension portion 207 is connected to the first end 209 of the first dimension portion 205. As a result, the connection portion provided between the first pad 204 and the light-emitting element can have a larger flat area, thereby optimizing the setting effect of the light-emitting element.

[0179] For example, the second dimension portion 207 may also be other structures, and the embodiments disclosed herein are not limited to this.

[0180] It should be noted that in the above embodiments, for the same first pad, each dimension portion included therein can be integrally formed with the adjacent dimension portions, thereby simplifying the process and reducing manufacturing costs. For example, in the same first pad, all dimension portions are integrally formed.

[0181] refer to Figures 5C to 5EThe present disclosure provides a light-emitting substrate 01, including: a substrate 101, a reflective layer 100, at least one pad 201, a light-emitting element 102, and a connecting portion 105. The reflective layer 100 is disposed on the substrate 101 and includes an opening 103; the orthographic projection of at least one pad 201 on the substrate 101 at least partially overlaps with the orthographic projection of the opening 103 on the substrate 101, and the at least one pad 201 includes a first pad 204 and a second pad 208, the first pad 204 and the second pad 208 being symmetrically distributed with respect to a first center line R2 located between the first pad 204 and the second pad 208.

[0182] refer to Figures 5C to 5E The light-emitting element 102 is disposed on the substrate 101. The orthographic projection of the light-emitting element 102 on the substrate 101 at least partially overlaps with the orthographic projection of the opening 103 on the substrate 101. The light-emitting element 103 includes a first electrode 202 and a second electrode 203. The first electrode 202 and the second electrode 203 are symmetrically distributed with respect to a second center line R2 located between the first electrode 202 and the second electrode 203.

[0183] like Figure 5B As shown, the connecting portion 105 is disposed between at least one pad 201 and the light-emitting element 102, and is configured to connect at least one pad 201 and the light-emitting element 102.

[0184] For example, the first pad 204 is disposed on the side of one of the first electrode 202 and the second electrode 203 close to the substrate 101, and the second pad 208 is disposed on the side of the other of the first electrode 202 and the second electrode 203 away from the substrate 101. The minimum interval between the first electrode 202 and the second electrode 203 in their arrangement direction is the fourth dimension Z, and the minimum interval between the first pad 204 and the second pad 208 in their arrangement direction is the fifth dimension D, where 0.9Z ≤ D ≤ Z.

[0185] refer to Figures 5C to 5E The first pad 204 and the second pad 208 are spaced apart in the second direction Y, and the first electrode 202 and the second electrode 203 are also spaced apart in the second direction Y. The light-emitting element 102 is disposed on the side of the pad 201 away from the substrate 101.

[0186] refer to Figures 5C to 5E When the light-emitting element 102 is disposed on the side of the pad 201 away from the substrate 101, the fourth dimension Z and the fifth dimension D satisfy the condition: 0.9Z ≤ D ≤ Z, that is, the fifth dimension D is less than or equal to the fourth dimension Z. As a result, the light-emitting element 102 is less likely to tilt or shift under the tension of the connecting portion 105, so that the light-emitting substrate 01 can have good optical performance.

[0187] The structural features of the light-emitting substrate 01 can be referred to the relevant descriptions in the foregoing embodiments, and will not be repeated here.

[0188] For example, refer to Figures 5A-5E The present disclosure provides a light-emitting substrate, including: a substrate 101, a reflective layer 100, at least one pad 201, a light-emitting element 102, and a connecting portion 105. The reflective layer 100 is disposed on the substrate 101, and the reflective layer 100 includes an opening 103.

[0189] For example, refer to Figures 5A-5E At least one pad 201 has its orthographic projection on the substrate 101 at least partially overlapping with the orthographic projection of the opening 103 on the substrate 101. The at least one pad 201 includes a first pad 204 and a second pad 208, which are symmetrically distributed with respect to a first centerline R2 located between the first pad 204 and the second pad 208.

[0190] For example, refer to Figures 5A-5E The light-emitting element 102 is disposed on the substrate 101. The orthographic projection of the light-emitting element 102 on the substrate 101 at least partially overlaps with the orthographic projection of the opening 103 on the substrate 101. The light-emitting element 103 includes a first electrode 202 and a second electrode 203. The first electrode 202 and the second electrode 203 are symmetrically distributed with respect to a second center line R2 located between the first electrode 202 and the second electrode 203.

[0191] For example, such as Figure 5B As shown, the connecting portion 105 is disposed between at least one pad 201 and the light-emitting element 102, and is configured to connect at least one pad 201 and the light-emitting element 102.

[0192] For example, refer to Figures 5A-5E The first pad 204 is disposed on the side of one of the first electrode 202 and the second electrode 203 near the substrate 101, and the second pad 208 is disposed on the side of the other of the first electrode 202 and the second electrode 203 away from the substrate 101. The first pad 204 includes a first size portion 205 and a second size portion 207. The maximum distance between the first size portion 205 and the first center line R1 in the second direction Y is the sixth size C1, and the minimum distance between the second size portion 207 and the first center line R1 in the second direction Y is the seventh size C2. The maximum distance between the first electrode 201 and the second center line R2 in the second direction Y is the eighth size Y1, where Y1 = MAX(C1, C2).

[0193] refer to Figures 5A-5EThe first dimension portion 205 and the sixth dimension C1 of the first center line R1 in the second direction Y, and the second dimension portion 207 and the seventh dimension C2 of the first center line R1 in the second direction Y, satisfy Y=MAX(C1, C2). The difference between the sixth dimension C1 and the seventh dimension C2 is substantially equivalent to the dimension of the first electrode 202 or the second electrode 203 in the second direction Y. For example, the edge 214 of the first electrode 202 away from the second center line R2 is substantially located at the end of the first dimension portion 205 of the first pad 204 near the first center line R1. The first dimension portion 205 can provide a large installation area for the first electrode 202, so that the first electrode 202 can be positioned as much as possible on the flat area 160 of the connecting portion 105 in the direction away from the second center line R2 in the second direction Y.

[0194] Therefore, the light-emitting substrate 01 provided in the embodiments of this disclosure helps to prevent the light-emitting element 102 from tilting or shifting, thereby enabling the light-emitting substrate 01 to have good optical performance. At the same time, the pads in the embodiments of this disclosure have an appropriate spacing between them and the surrounding reflective layer, which can reduce the risk of "gold infiltration" occurring.

[0195] The structural features of the light-emitting substrate 01 can be referred to the relevant descriptions in the foregoing embodiments, and will not be repeated here.

[0196] refer to Figures 5A-5E This disclosure provides a light-emitting substrate, including: a substrate 101, a reflective layer 100, and at least one pad 201. The reflective layer 100 is disposed on the substrate 101, and the reflective layer 100 includes an opening 103, the maximum dimension of the opening 103 in a first direction X being H1.

[0197] refer to Figures 5A-5E At least one pad 201 has its orthographic projection on the substrate 101 at least partially overlapping with the orthographic projection of the opening 103 on the substrate 101. The at least one pad 201 includes a first pad 204 and a second pad 208. The first pad 204 and the second pad 208 are spaced apart in a second direction Y, which intersects with the first direction X. The first pad 204 includes a first size portion 205 and a second size portion 207. The first size portion 205 has a minimum distance K2 with the opening 103, and the second size portion 207 has a maximum distance H2 with the opening 103, satisfying: H2=H1 / 3±0.2μm, 50μm≤H1-2K2-(H1-2H2) / (1±0.2)≤100μm.

[0198] refer to Figures 5A-5EFor example, the orthographic projection of the light-emitting element 102 disposed on the side of the pad 201 away from the substrate 101 onto the substrate 101 can be narrow and elongated; for example, the orthographic projection of the light-emitting element 102 onto the substrate 101 can be rectangular. For example, as... Figure 5D As shown, the light-emitting element 102 includes a first electrode 202 and a second electrode 203. The maximum dimension of the first electrode 202 in the first direction X is K1. For example, for the second dimension portion 201, H1-H2=(1±0.2)K1, and H2≈H1 / 3. In this case, the first dimension portion 201 has a certain limiting effect on the displacement of the light-emitting element 102. Compared with the second dimension portion 207, the first dimension portion 205 has a larger dimension in the first direction X. This allows the connection portion 105 provided between the pad 201 and the light-emitting element 102 to have a larger flat area 160, thereby reducing the risk of tilting of the light-emitting element 201.

[0199] For example, a reflow soldering process can be used to solder the light-emitting element 102 to the pads, ensuring that the orthogonal projection area of ​​the opening 103 in the reflective layer 100 onto the substrate 101 is larger than the orthogonal projection area of ​​the pad 201 onto the substrate 101. For example, the orthogonal projection area of ​​the pad 201 onto the substrate 101 is completely surrounded by the orthogonal projection area of ​​the opening 103 in the reflective layer 100 onto the substrate 101. The pad 201 can have a certain distance from the opening 103. For example, the pad 201 can have a certain distance from the opening 103 in its non-outgoing direction. By ensuring that H2 = H1 / 3 ± 0.2 μm, and 50 μm ≤ H1 - 2K2 - (H1 - 2H2) / (1 ± 0.2) ≤ 100 μm, the pad 201 inside the opening can be spaced from the reflective layer 100, and the risk of "gold penetration" can be reduced within this distance range. At the same time, it also ensures that the opening range of the opening 103 is not too large, and that the reflective layer 100 has a sufficient coverage area, thereby enhancing the reflectivity of the light-emitting substrate 01 and thus giving the light-emitting substrate 01 good optical performance.

[0200] Embodiments of this disclosure also provide a display device including any of the light-emitting modules described above.

[0201] Figure 8 This is a schematic diagram of a display device provided in an embodiment of the present disclosure.

[0202] like Figure 8 As shown, the display device 1000 includes a light-emitting substrate 01, an optical layer 02, and a display panel 03. The optical layer 02 is disposed on the side of the light-emitting element 102 away from the substrate 101, and the display panel 03 is disposed on the side of the optical layer 02 away from the light-emitting substrate 01.

[0203] For example, optical layer 02 includes a diffusion layer 0202, a quantum dot film layer 0203, a diffusion layer 0204, and a composite film layer 0205 sequentially disposed along a vertical direction away from substrate 101. For example, diffusion layers 0202 and 0204 can improve the shadow cast by the light-emitting substrate 01, thereby improving the display quality of display device 1000. Quantum dot film layer 0203 can convert blue light emitted by the light-emitting substrate 01 into white light under excitation, thereby improving the utilization rate of light energy of the light-emitting substrate 01. Composite film layer 0205 can improve the brightness of light propagated through composite film layer 0205. For example, optical layer 02 may also include other film layers to improve the optical performance of display device 1000.

[0204] For example, the light-emitting substrate 01 and the optical layer 02 may constitute at least a portion of the light-emitting module 012 in the display device 1000. The display panel 03 is disposed on one side of the light-emitting module 012 and is configured to protect the various devices in the display device 1000. For example, the display panel 03 may include multiple functional layers to better achieve the display effect.

[0205] In the display device 1000 provided in the above embodiments, the light-emitting elements in the light-emitting substrate 01 are less prone to circuit failures caused by "gold infiltration phenomenon", and have better circuit protection; at the same time, the light-emitting elements in the light-emitting substrate 01 have a low probability of optical path deviation, and the light-emitting substrate 01 has good optical performance. Therefore, the display performance of the display device 1000 can be improved.

[0206] For example, the aforementioned display device 1000 may include a liquid crystal display (LCD). For example, the display device 1000 may be implemented in or associated with a variety of electronic devices, such as (but not limited to) mobile phones, wireless devices, personal data assistants (PDAs), handheld or portable computers, GPS receivers / navigators, cameras, MP4 video players, camcorders, game consoles, watches, clocks, calculators, television monitors, flat panel displays, computer monitors, automotive displays (e.g., odometer displays), navigators, cockpit controllers and / or displays, displays of camera views (e.g., displays of rearview cameras in vehicles), electronic photographs, electronic billboards or signs, projectors, architectural structures, packaging and aesthetic structures (e.g., displays of images of a piece of jewelry), etc.

[0207] The following points need to be explained:

[0208] (1) The accompanying drawings of the embodiments of this disclosure only involve the structures involved in the embodiments of this disclosure, and other structures can be referred to the general design.

[0209] (2) Where there is no conflict, features of the same embodiment and different embodiments of this disclosure may be combined with each other.

[0210] The above description is merely an exemplary embodiment of this disclosure and is not intended to limit the scope of protection of this disclosure, which is determined by the appended claims.

Claims

1. A light-emitting substrate, comprising: substrate; A reflective layer is disposed on the substrate, the reflective layer including an opening, the maximum dimension of the opening in a first direction being H1; At least one pad, wherein the orthographic projection of the at least one pad on the substrate at least partially overlaps the orthographic projection of the opening on the substrate; A light-emitting element is disposed on the substrate, wherein the orthographic projection of the light-emitting element on the substrate at least partially overlaps with the orthographic projection of the opening on the substrate, and the light-emitting element includes a first electrode and a second electrode; A connecting portion is disposed between the at least one pad and the light-emitting element, and is configured to connect the at least one pad and the light-emitting element. The connecting portion includes an edge curvature area, and the maximum dimension of the edge curvature area in the first direction is M. Wherein, the first electrode and the second electrode are spaced apart in a second direction, the second direction intersects the first direction, and the maximum size of the first electrode or the second electrode in the first direction is a first size K1; The at least one pad includes a first pad, the first pad includes a first size portion, the orthographic projection of either the first electrode or the second electrode on the substrate falls into the orthographic projection of the opening on the substrate, the orthographic projection of the first size portion on the substrate at least partially overlaps with the orthographic projection of either the first electrode or the second electrode on the substrate, the minimum distance between the first size portion and the opening in the first direction is a second size K2, the second size K2 satisfies: K2≤0.5H1-0.5(K1+2M), and 50 μm≤H1-2K2-K1≤100 μm.

2. The light-emitting substrate according to claim 1, wherein, The first pad further includes a second dimension portion, the first dimension portion and the second dimension portion are arranged in the second direction, and the maximum distance between the second dimension portion and the opening in the first direction is a third dimension H2, the third dimension H2 satisfying: 0.5H1-0.6K1 ≤ H2 ≤0.5H1-0.4K1.

3. The light-emitting substrate according to claim 2, wherein, The at least one pad further includes a second pad, the first pad and the second pad being spaced apart and symmetrical with respect to a first centerline located between the first pad and the second pad; The first electrode and the second electrode are symmetrically distributed with respect to the second center line located between the first electrode and the second electrode of the light-emitting element; Wherein, at least one pad is disposed on the side of the first electrode and the second electrode closer to the substrate; The minimum distance between the first electrode and the second electrode in the second direction is the fourth dimension Z; The minimum distance between the first pad and the second pad in the second direction is the fifth dimension D, 0.9Z ≤ D ≤ Z.

4. The light-emitting substrate according to claim 3, wherein, The maximum distance between the first dimension portion and the first center line in the second direction is the sixth dimension C1, and the minimum distance between the second dimension portion and the first center line in the second direction is the seventh dimension C2; The maximum distance between the first electrode and the second center line in the second direction is the eighth dimension Y, where Y = MAX(C1, C2).

5. The light-emitting substrate according to any one of claims 3-4, wherein, In the second direction, the maximum distance between the edge of the first pad away from the second pad and the edge of the second pad away from the first pad is equal to the maximum size of the opening; The first dimension portion and the second dimension portion each include a first end and a second end opposite to each other, and the first end of the first dimension portion is closer to the first center line than the second end of the first dimension portion, and the first end of the second dimension portion is closer to the first center line than the second end of the second dimension portion.

6. The light-emitting substrate according to claim 5, wherein, The first end of the first dimension portion is connected to the second end of the second dimension portion; In the first direction, the maximum distance between the first end of the second dimension portion and the opening is the third dimension H2.

7. The light-emitting substrate according to claim 6, wherein, The first dimension portion is projected onto the substrate in a rectangular shape. The size of the first dimension portion in the first direction is larger than the size of the first dimension portion in the second direction. The orthogonal projection of the second end of the first dimension portion onto the substrate overlaps with the orthogonal projection of the opening onto the substrate. The second dimension portion is projected onto the substrate in the form of a trapezoid. The second dimension portion includes an upper base and a lower base parallel to the first center line. The distance between the upper base and the opening in the first direction is greater than the distance between the lower base and the opening in the first direction.

8. The light-emitting substrate according to claim 6, wherein, The first dimension portion is projected onto the substrate as a rectangle, and the dimension of the first dimension portion in the first direction is larger than the dimension of the first dimension portion in the second direction; The second dimension portion is projected onto the substrate as a rectangle, and the dimension of the second dimension portion in the first direction is larger than the dimension of the second dimension portion in the second direction; The first pad further includes a third dimension portion, which includes a first end and a second end opposite to each other. In the second direction, the first end of the third dimension portion is connected to the second end of the first dimension portion. The orthographic projection of the second end of the third dimension portion on the substrate overlaps with the orthographic projection of the opening on the substrate. The dimension of the third dimension portion in the second direction is smaller than the dimension of the first dimension portion in the second direction.

9. The light-emitting substrate according to claim 8, wherein, The dimension of the second dimension portion in the first direction gradually increases from the first end of the second dimension portion to the second end of the second dimension portion, and the dimension of the second end of the second dimension portion in the first direction is equal to the dimension of the first end of the first dimension portion in the first direction.

10. The light-emitting substrate according to claim 5, wherein, In the first direction, the minimum distance between the first end of the first dimension portion and the opening is the second dimension K2, the maximum distance between the first end of the second dimension portion and the opening is the third dimension H2, and the orthographic projection of the second end of the second dimension portion on the substrate overlaps with the orthographic projection of the opening on the substrate.

11. The light-emitting substrate according to claim 10, wherein, The first dimension portion is projected onto the substrate as a rectangle, and the dimension of the first dimension portion in the first direction is larger than the dimension of the first dimension portion in the second direction; The second dimension portion is projected onto the substrate as a rectangle, and the dimension of the second dimension portion in the first direction is smaller than the dimension of the first dimension portion in the second direction; The first dimension portion is connected to the second dimension portion.

12. The light-emitting substrate according to claim 11, wherein, The first pad further includes a third dimension portion, the third dimension portion including a first end and a second end opposite to each other, and in the second direction the first end of the third dimension portion is connected to the second end of the first dimension portion, and the second end of the third dimension portion is connected to the first end of the second dimension portion; The dimension of the third dimension portion in the first direction gradually decreases from the first end of the third dimension portion to the second end of the third dimension portion. The dimension of the first end of the third dimension portion in the first direction is equal to the dimension of the second end of the first dimension portion in the first direction. The dimension of the second end of the third dimension portion in the first direction is equal to the dimension of the first end of the second dimension portion in the first direction.

13. The light-emitting substrate according to claim 12, wherein, The third dimension portion is projected onto the substrate in the form of a trapezoid.

14. The light-emitting substrate according to claim 10, wherein, In the first direction, the size of the second end of the first dimension portion is equal to the size of the first end of the second dimension portion, and the second end of the first dimension portion is connected to the first end of the second dimension portion; The dimension of the first dimension portion in the first direction gradually decreases from the first end of the first dimension portion to the second end of the second dimension portion; The first pad further includes a third dimension portion, which includes a first end and a second end opposite to each other, and the second end of the third dimension portion abuts and engages with the first end of the first dimension portion in the second direction.

15. The light-emitting substrate according to claim 14, wherein, The dimension of the third dimension portion gradually decreases from the first end to the second end of the third dimension portion in the first direction. The first dimension portion is projected as a trapezoid on the substrate, and the third dimension portion is projected as a trapezoid on the substrate.

16. The light-emitting substrate according to claim 14, wherein, The connecting side between the first end of the first dimension portion and the first end of the second dimension portion is arc-shaped; The first end of the third dimension section is arc-shaped.

17. The light-emitting substrate according to claim 5, wherein, In the first direction, the minimum distance between the first end of the first dimension portion and the opening is the second dimension K2, the maximum distance between the first end of the second dimension portion and the opening is the third dimension H2, and the second end of the first dimension portion is connected to the first end of the second dimension portion; The first pad further includes a third-size portion and a fourth-size portion, each of which includes a first end and a second end opposite to each other. In the second direction, the first end of the third-size portion is connected to the second end of the second-size portion, and the orthographic projection of the second end of the third-size portion on the substrate overlaps with the orthographic projection of the opening on the substrate. The second end of the fourth-size portion is connected to the first end of the first-size portion. The dimension of the third dimension portion in the first direction gradually decreases from the first end to the second end of the third dimension portion; The dimension of the fourth dimension portion in the first direction gradually decreases from the first end of the fourth dimension portion to the second end of the fourth dimension portion, and the dimension of the second end of the fourth dimension portion in the first direction is equal to the dimension of the first end of the first dimension portion in the first direction.

18. The light-emitting substrate according to claim 17, wherein, The first dimension portion, the second dimension portion, the third dimension portion, and the fourth dimension portion are all trapezoidal when projected onto the substrate.

19. The light-emitting substrate according to any one of claims 3-4, wherein, In the first direction, the maximum size of the first sized portion is equal to the maximum size of the opening; The first dimension portion and the second dimension portion each include a first end and a second end opposite to each other, and the first end of the first dimension portion and the first end of the second dimension portion are disposed on one side close to the first center line; The minimum distance between the second end of the first dimension portion and the opening in the second direction is substantially equal to the dimension of the first dimension portion in the second direction.

20. The light-emitting substrate according to claim 19, wherein, The dimension of the first dimension portion in the first direction is greater than the dimension of the first dimension portion in the second direction; The dimension of the second dimension portion gradually increases from the first end to the second end in the second direction.

21. The light-emitting substrate according to claim 19, wherein, The first dimension portion is projected onto the substrate in the form of a rectangle, and the second dimension portion is projected onto the substrate in the form of a trapezoid.

22. A light-emitting substrate, comprising: substrate, A reflective layer is disposed on the substrate, the reflective layer including an opening, the maximum dimension of the opening in a first direction being H1; At least one pad, wherein the orthographic projection of the at least one pad on the substrate at least partially overlaps with the orthographic projection of the opening on the substrate, the at least one pad including a first pad and a second pad, the first pad and the second pad being spaced apart in a second direction, the second direction intersecting the first direction, the first pad including a first size portion and a second size portion, the first size portion and the second size portion being arranged in the second direction. Wherein, the first sized portion has a minimum distance K2 with respect to the opening, and the second sized portion has a maximum distance H2 with respect to the opening, and satisfies: H2=H1 / 3±0.2μm, 50μm ≤H1-2K2-(H1-2H2) / (1±0.2) ≤100μm.

23. A display device comprising a light-emitting substrate according to any one of claims 1-22.

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