Light-emitting substrate and display device

Abstract

Provided are a light-emitting substrate and a display device. The light-emitting substrate includes a substrate, a reflective layer, at least one pad, a light-emitting element, and a connection portion. The reflective layer includes an opening having a maximum dimension H1 in a first direction. The light-emitting element includes a first electrode and a second electrode spaced apart in a second direction, and the maximum dimension of the first electrode or the second electrode in the first direction is a first dimension K1. The connection portion includes an edge arc region having a maximum dimension M in the first direction. The at least one pad includes a first pad, and the first pad includes a first dimension portion. In the first direction, the minimum distance between the first dimension portion and the opening is a second dimension K2, and K2 ≦ 0.5H1 - 0.5(K1 + 2M), and 50 μm ≦ H1 - 2K2 - K1 ≦ 100 μm is satisfied. By optimizing the fitting dimension between the opening of the reflective layer of the light-emitting substrate and the pad, the risk of metal intrusion into the reflective layer can be reduced, and the inclination of the light-emitting element can be avoided, thereby improving the optical performance of the display product.

Description

Technical Field

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

Background Art

[0002] Currently, Micro LED Display technology is becoming increasingly mature and has features such as low energy consumption and high brightness, so it has high development potential.

Summary of the Invention

Means for Solving the Problems

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

[0004] An embodiment of the present disclosure provides a light-emitting substrate, including a substrate, a reflective layer installed on the substrate and including an opening with a maximum dimension H1 in the first direction, at least one pad whose orthographic projection on the substrate at least partially overlaps with the orthographic projection of the opening on the substrate, a light-emitting element installed on the substrate whose orthographic projection 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, and a connection part installed between the pad and the light-emitting element, configured to connect the pad and the light-emitting element and including an edge arc region with a maximum dimension M in the first direction. The first electrode and the second electrode are installed at intervals in a second direction intersecting the first direction, the maximum dimension of the first electrode or the second electrode in the first direction is a first dimension K1, the at least one pad includes a first pad, the first pad includes a first dimension part, and the minimum distance between the first dimension part and the opening in the first direction is a second dimension K2. The second dimension K2 satisfies K2≤0.5H1−0.5(K1 + 2M) and 50μm≤H1−2K2−K1≤100μm.

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

[0006] For example, according to an embodiment of the present disclosure, the at least one pad further includes a second pad, the first pad and the second pad are distributed at intervals, and are symmetric 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. The at least one pad is installed on a side of the substrate close to the first electrode and the second electrode. A minimum distance between the first electrode and the second electrode in the second direction is a fourth dimension Z, and a minimum distance between the first pad and the second pad in the second direction is a fifth dimension D, and 0.9Z ≤ D ≤ Z.

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

[0008] For example, according to an embodiment of the present disclosure, in the second direction, a maximum distance between a far edge of the first pad from the second pad and a far edge of the second pad from the first pad is the same as a maximum dimension of the opening. The first dimension portion and the second dimension portion each include a first end and a second end facing 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.

[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 dimensional part and the opening is a second dimension K2, and the maximum distance between the first end of the second dimensional part and the opening is a third dimension H2.

[0010] For example, according to an embodiment of the present disclosure, the orthographic projection of the first dimensional part on the substrate is a rectangle, the dimension of the first dimensional part in the first direction is larger than the dimension of the first dimensional part in the second direction, the orthographic projection of the second end of the first dimensional part on the substrate overlaps with the orthographic projection of the opening on the substrate, the orthographic projection of the second dimensional part on the substrate is a trapezoid, the second dimensional part includes an upper bottom and a lower bottom parallel to the first center line, and the distance in the first direction between the upper bottom and the opening is larger than the distance in the first direction between the lower bottom and the opening.

[0011] For example, according to an embodiment of the present disclosure, the orthographic projection of the first dimensional part on the substrate is a rectangle, the dimension of the first dimensional part in the first direction is larger than the dimension of the first dimensional part in the second direction, the orthographic projection of the second dimensional part on the substrate is a rectangle, the dimension of the second dimensional part in the first direction is larger than the dimension of the second dimensional part in the second direction, the first pad further includes a third dimensional part, the third dimensional part includes a first end and a second end facing each other, and in the second direction, the first end of the third dimensional part is connected to the second end of the first dimensional part, the orthographic projection of the second end of the third dimensional part on the substrate overlaps with the orthographic projection of the opening on the substrate, and the dimension of the third dimensional part in the second direction is less than the dimension of the first dimensional part in the second direction.

[0012] For example, according to an embodiment of the present disclosure, the dimension of the second dimensional part in the first direction gradually increases from the first end of the second dimensional part to the second end of the second dimensional part, and the dimension of the second end of the second dimensional part in the first direction is the same as the dimension of the first end of the first dimensional part 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 the orthographic projection of the opening on the substrate.

[0014] For example, according to an embodiment of the present disclosure, the orthographic projection of the first dimension portion on the substrate is rectangular, 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 orthographic projection of the second dimension portion on the substrate is rectangular, the dimension of the second dimension portion in the first direction is less than the dimension of the first dimension portion in the second direction, and 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 the present disclosure, the first pad further includes a third dimension portion, the third dimension portion includes opposite 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 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 the same as 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 the same as the dimension of the first end of the second dimension portion in the first direction.

[0016] For example, according to an embodiment of the present disclosure, the orthographic projection of the third dimension portion on the substrate is trapezoidal.

[0017] For example, according to an embodiment of the present disclosure, in the first direction, the dimension of the second end of the first dimension portion is the same as the dimension 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 toward the second end of the first dimension portion. The first pad further includes a third dimension portion. The third dimension portion includes a first end and a second end facing each other. In the second direction, the second end of the third dimension portion abuts against 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 of the third dimension portion toward the second end of the third dimension portion.

[0018] For example, according to an embodiment of the present disclosure, the orthographic projection of the first dimension portion on the substrate is trapezoidal, and the orthographic projection of the third dimension portion on the substrate is trapezoidal.

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

[0020] 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. 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. Both the third dimension portion and the fourth dimension portion include a first end and a second end facing each other. 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 of the third dimension portion. The dimension of the fourth dimension portion in the first direction gradually decreases from the first end to the second end of the fourth dimension portion. The dimension of the second end of the fourth dimension portion in the first direction is the same as the dimension of the first end of the first dimension portion in the first direction.

[0021] For example, according to an embodiment of the present disclosure, the orthographic projections of the first dimension portion, the second dimension portion, the third dimension portion, and the fourth dimension portion on the substrate are all trapezoids.

[0022] For example, according to an embodiment of the present disclosure, in the first direction, the maximum dimension of the first dimension portion is the same as the maximum dimension of the opening, the first dimension portion and the second dimension portion each include a first end and a second end that face each other, and the first end of the first dimension portion and the first end of the second dimension portion are disposed on the side closer to the first center line, and the minimum distance in the second direction between the second end of the first dimension portion and the opening is substantially the same as the dimension of the first dimension portion in the second direction.

[0023] For example, according to an embodiment of the present disclosure, 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, and the dimension 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 orthographic projection of the first dimension portion on the substrate is a rectangle, and the orthographic projection of the second dimension portion on the substrate is a trapezoid.

[0025] Embodiments of the present disclosure provide a light-emitting substrate, including a substrate, a reflective layer disposed on the substrate and including an opening, at least one pad, where a positive projection of the at least one pad on the substrate at least partially overlaps with a positive projection of the opening on the substrate, the at least one pad includes a first pad and a second pad, the first pad and the second pad are symmetrically distributed with respect to a first center line located between the first pad and the second pad, at least one pad, a light-emitting element disposed on the substrate, where a positive projection of the light-emitting element on the substrate at least partially overlaps with a positive projection of the opening on the substrate, the light-emitting element includes a first electrode and a second electrode, 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, a light-emitting element, and a connection portion disposed between the at least one pad and the light-emitting element and configured to connect the at least one pad and the light-emitting element, the first pad is disposed on a side of one of the first electrode and the second electrode close to the substrate, the second pad is disposed on a side of the other of the first electrode and the second electrode far from the substrate, a minimum distance in an arrangement direction between the first electrode and the second electrode is a fourth dimension Z, a minimum distance in an arrangement direction between the first pad and the second pad is a fifth dimension D, and 0.9Z≤D≤Z.

[0026] Embodiments of the present disclosure provide a light-emitting substrate, including a substrate, a reflective layer disposed on the substrate and including an opening, at least one pad, a positive projection of the at least one pad on the substrate at least partially overlapping a positive 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, a positive projection of the light-emitting element on the substrate at least partially overlapping a positive 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 connection portion disposed between the at least one pad and the light-emitting element and configured to connect the at least one pad and the light-emitting element. The first pad is disposed on a side of one of the first electrode and the second electrode close to the substrate, the second pad is disposed on a side of the other of the first electrode and the second electrode far from the substrate. The first pad includes a first dimension portion and a second dimension portion. A minimum distance between the first dimension portion and the first center line in an arrangement direction of the first pad and the second pad is a sixth dimension C1, a 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 dimension C2, a maximum distance between the first electrode and the second center line in an arrangement direction of the first electrode and the second electrode is an eighth dimension Y, and Y = MAX(C1, C2).

[0027] Embodiments of the present disclosure provide a light-emitting substrate, including a substrate, a reflective layer disposed on the substrate and including an opening having a maximum dimension H1 in the first direction, and at least one pad, a positive projection of the at least one pad on the substrate at least partially overlapping a positive 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 intersecting the first direction, the first pad including at least one pad including a first dimension portion and a second dimension portion, a minimum distance between the first dimension portion and the opening being K2, a maximum distance between the second dimension portion and the opening being H2, and satisfying H2 = H1 / 3 ± 0.2 μm, 50 μm ≤ H1 - 2K2 - (H1 - 2H2) / (1 ± 0.2) ≤ 100 μm.

[0028] Embodiments of the present disclosure provide a display device including the light-emitting substrate according to any one of the above items.

[0029] To more clearly illustrate the technical solutions of the embodiments of the present disclosure, the drawings of the embodiments will be briefly described below. Obviously, the drawings in the following description are only some embodiments of the present disclosure and do not limit the present disclosure.

Brief Description of the Drawings

[0030]

Figure 1

Figure 2A

Figure 2B

Figure 3

Figure 4

Figure 5A

Figure 5B

Figure 5C

Figure 5D

Figure 5E

Figure 5F

Figure 6A

Figure 6B

Figure 6C

Figure 6D

Figure 6E

Figure 6F

Figure 6G

Figure 6H

Figure 7

Figure 8

Embodiments for Carrying Out the Invention

[0031] To make the objectives, technical solutions, and advantages of the embodiments of the present disclosure clearer, hereinafter, with reference to the drawings of the embodiments of the present disclosure, the technical solutions of the embodiments of the present disclosure will be clearly and completely described. Of course, the described embodiments are only some embodiments of the present disclosure, not all embodiments. All other embodiments obtained by those skilled in the art based on the described embodiments of the present disclosure without creative efforts shall fall within the protection scope of the present disclosure.

[0032] Unless otherwise defined, the technical terms and scientific terms used in the present disclosure have the ordinary meanings that can be understood by those skilled in the art. The "first", "second", and similar terms used in the present disclosure do not indicate order, quantity, or importance, but are merely used to distinguish different components. Similar terms such as "comprising" or "including" mean that the elements or members described before "comprising" or "including" cover the elements or members listed after "comprising" or "including" and equivalents thereof, and do not exclude other elements or members.

[0033] The features such as "vertical", "parallel", and "same" used in the embodiments of the present disclosure all include the features such as "vertical", "parallel", "same" in the strict sense, and the state with certain errors such as "substantially vertical", "substantially parallel", "substantially same", and mean that within the allowable deviation range of a specific value determined by those skilled in the art considering the measured values and the errors related to the measured values of specific quantities (i.e., the limitations of the measurement system). The "center" in the embodiments of the present disclosure may include the location strictly located at the geometric center and the location substantially located at the approximate center within a small area around the geometric center. For example, "substantially" means within one or more standard deviations, or within 10% or 5% of the said value.

[0034] With the continuous development of micro light-emitting diode display technology, the optimization of the display effect has an inevitable tendency. In order to improve the performance of the display device, some display products optimize the fitting dimensions of the light-emitting elements on the light-emitting substrate and the structural form of the pads in the light-emitting substrate to optimize the circuit performance and optical effect.

[0035] With the continuous development of the new Micro LED Display technology, the light-emitting elements are usually fixed to the substrate of the display device by welding using welding materials in a reflow manner.

[0036] In the complete welding process, the welding material goes through steps such as preheating, heat preservation, reflow, and cooling in sequence. For example, the preheating stage can avoid damaging the elements due to rapid high-temperature heating and can enhance the activity of the welding material at this stage. The main purpose of the heat preservation stage is to stabilize the temperature of each element in the reflow furnace and minimize the temperature difference. This stage can provide sufficient time to make the temperature of the large elements on the light-emitting substrate consistent with that of the small elements and ensure the complete volatilization of the flux in the welding material. Furthermore, in the reflow process, the temperature rises rapidly, the welding material reaches the molten state, and the light-emitting elements are further adhered to the substrate. Finally, in the cooling stage, the temperature drops below the solidus temperature and the welding material solidifies.

[0037] For example, the above welding material may be a solder paste which is a paste mixed with solder powder, flux, and other additives. The solder paste has a certain viscosity at room temperature and can initially attach electronic components to predetermined positions. At the welding temperature, as the solvent and some additives volatilize, the solder paste can weld the components to be welded and the printed circuit pads together to form a permanent connection.

[0038] Figure 1 is a schematic cross-sectional view of the light-emitting substrate, Figure 2A is a schematic diagram of the pad installation on the light-emitting substrate, Figure 2B is another schematic diagram of the pad installation on the light-emitting substrate, and Figure 3 is a schematic diagram when the light-emitting elements on the light-emitting substrate are inclined or displaced.

[0039] As shown in Figure 1, the light-emitting substrate 10 includes pads 110, a welding material 105, and light-emitting elements 140, and the light-emitting elements 140 are installed on the side far from the pads 110 of the welding material 105.

[0040] As shown in FIGS. 2A to 2B, a reflective layer 100 is provided on one side of the substrate. The reflective layer 100 includes an opening 111, and there is no reflective layer 100 installed in the opening 111. The pad 110 is installed within the area of the opening 111 defined by the reflective layer 100, and the orthographic projection of the pad 110 on the substrate overlaps at least partially with the orthographic projection of the opening 111 on the substrate. The pad 110 includes a first pad 1101 and a second pad 1102 that are oppositely installed. For example, the first pad 1101 and the second pad 1102 respectively correspond to two connection electrodes in the light-emitting element, and by electrically connecting the two connection electrodes respectively, the light-emitting element can be made to emit light.

[0041] Normally, for the pad 110 installed in the opening 111, in order to enhance the connectivity between the pad 110 and the connection electrode, it is necessary to perform a predetermined process treatment such as copper plating.

[0042] For example, in the installation form of the pad 110 shown in FIG. 2A, the reflective layer 100 has a boundary 112. In the first direction X, the maximum dimension of the opening 111 of the reflective layer 100 is substantially the same as the maximum dimension of the pad 110 in the first direction X.

[0043] The inventor of the present disclosure found that when adopting the pad installation form as shown in FIG. 2(a), since the reflective layer 100 and the pad 110 are installed close to each other, when performing copper plating on the pad 110, there is a possibility that a part of the metal may penetrate from the opening 111 into the nearby reflective layer 100. If too much metal penetrates into the reflective layer 100, the first pad 1101 and the second pad 1102 may be electrically connected by the metal in the penetrated part within the reflective layer 100. As a result, faults such as short circuits may occur, which may affect the light-emitting effect of the light-emitting element.

[0044] Therefore, the installation form of the pad as shown in FIG. 2B can be adopted. That is, by making the maximum dimension of the opening 111 of the reflective layer 100 in the first direction X larger than the dimension of the pad 110 in the first direction X, the opening 111 of the reflective layer 100 has a certain separation distance from the pad 110 in the first direction X. In this way, during the process of performing process treatment (for example, copper plating treatment) on the pad 110, it is difficult for the metal to penetrate into the reflective layer 100 from the opening 111, and the risk of the "metal penetration phenomenon" can be reduced.

[0045] However, regarding the pad installation form as shown in FIG. 2B, the dimension of the opening 111 has a great influence on the performance of the entire light-emitting substrate 10. For example, if the dimension of the opening 111 is too large, the overall area of the reflective layer 100 will become smaller, and furthermore, the light reflection effect by the reflective layer 100 will become weaker, and the luminous efficiency of the light-emitting substrate 10 may decrease. If the dimension of the opening 111 is too small, the distance between the pad 22 and the surrounding reflective layer 100 will become smaller, and the risk of the "metal penetration phenomenon" may increase.

[0046] In addition, as shown in FIG. 1, the inventor of the present disclosure further forms a flat region 160 at the contact portion (e.g., the electrode region) where the welding material 105 is usually welded to the light-emitting element 140 after welding, and when the flat regions 160 are distributed symmetrically (or substantially symmetrically) with respect to the center line L, it is found that the light-emitting elements 140 are also distributed symmetrically (or substantially symmetrically) with respect to the center line L, and at this time, the light-emitting elements 140 do not shift. When the pads adopt the installation form shown in FIG. 2B, when the light-emitting element 140 is fixed to the pad 110 by reflow and the welding material 105 is melted into a liquid state, there is no opening 111 of the reflective layer 100 as a boundary restricting the flow state of the welding material 105 shown in FIG. 2A, so the liquid welding material 105 forms edge arc regions 150 located on both sides of the flat region 160 under the action of tension. And in this case, the light-emitting element 140 is likely to move irregularly to both sides of the center line L due to the influence of its own gravity and reflow air flow, etc., and after the light-emitting element 140 moves to the arc regions 150 on both sides of the welding material 105, the inclination degree of the light-emitting element 140 becomes even larger.

[0047] FIG. 3 shows the case where the light-emitting element 140 is inclined or shifted as described above. For example, the range of the inclination angle β of the light-emitting element 140 is about 7 to 12°. Thus, when a plurality of light-emitting elements 140 on the light-emitting substrate 10 are inclined at different angles simultaneously, the light-emitting angles of the light-emitting elements 140 are different, and thereby the light-emitting intensities in the third direction Z perpendicular to the substrate of the light-emitting elements 140 on the pad 110 are different, which may cause phenomena such as unevenness in the darkness or brightness of the light-emitting substrate 10 in the backlight state.

[0048] Based on this, an embodiment of the present disclosure provides a light-emitting substrate including a substrate, a reflective layer, at least one pad, a light-emitting element, and a connection portion. The reflective layer is disposed on the substrate. The reflective layer includes an opening, the maximum dimension of the opening in a first direction is H1, the orthographic projection of at least one pad on the substrate at least partially overlaps the orthographic projection of the opening on the substrate, the light-emitting element is disposed on the substrate, the orthographic projection of the light-emitting element on the substrate at least partially overlaps the orthographic projection of the opening on the substrate, and the light-emitting element includes a first electrode and a second electrode. The connection portion is disposed between the pad and the light-emitting element and is configured to connect the pad and the light-emitting element. The connection portion includes an edge arc region, the maximum dimension 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 intersecting the first direction, the maximum dimension of the first electrode or the second electrode in the first direction is a first dimension K1, at least one pad includes a first pad, the first pad includes a first dimension portion, and the minimum distance between the first dimension portion and the opening in the first direction is a second dimension K2, and the second dimension K2 satisfies K2≦H1 / 2−1 / 2(K1 + 2M) and 50μm≦H1−2K2−K1≦100μm.

[0049] The light-emitting substrate according to the embodiment of the present disclosure can have an appropriate separation distance between the pad of the light-emitting substrate and the edge of the opening of the reflective layer where the pad is located, so as to reduce the "metal intrusion phenomenon", reduce the tilt risk of the light-emitting element disposed on the pad, and further optimize the optical performance of the light-emitting substrate.

[0050] Hereinafter, the light-emitting substrate and the display device according to the embodiment of the present disclosure will be described with reference to the drawings.

[0051] FIG. 4 is a plan view of a light-emitting substrate according to an embodiment of the present disclosure, FIG. 5A is a schematic cross-sectional view of the light-emitting substrate along line A-B of FIG. 4, FIG. 5B is a schematic cross-sectional view of the light-emitting substrate along line C-D of FIG. 5A, FIG. 5C is a schematic structural view of a pad of the light-emitting substrate according to an embodiment of the present disclosure, FIG. 5D is a schematic view of a light-emitting element of the light-emitting substrate according to an embodiment of the present disclosure, FIG. 5E is a schematic view of a cooperative installation of the light-emitting element and the pad of the light-emitting substrate according to an embodiment of the present disclosure, and FIG. 5F is a schematic view when the light-emitting element of the light-emitting substrate according to an embodiment of the present disclosure is displaced.

[0052] As shown in FIGS. 4 to 5D, an embodiment of 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 connection portion 105.

[0053] As shown in FIGS. 4 to 5C, the reflective layer 100 is installed on the substrate 101 and is configured to reflect light irradiated thereon. The reflective layer 100 includes an opening 103, the maximum dimension of the opening 103 in the first direction X is H1, and the orthographic projection of at least one pad 201 on the substrate 101 at least partially overlaps the orthographic projection of the opening 103 on the substrate 101. However, in the light-emitting substrate according to the embodiment of the present disclosure, the reflective layer 100 is not installed in the region defined by the opening 103.

[0054] As shown in FIGS. 4 to 5D, the light-emitting element 102 is installed on the substrate 101, the orthographic projection of the light-emitting element 102 on the substrate 101 at least partially overlaps the orthographic projection of the opening 103 on the substrate 101, and includes a first electrode 202 and a second electrode 203. The connection portion 105 is installed 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 connection portion 105 includes an edge arc region 150, and the maximum dimension of the edge arc region 150 in the first direction X is M.

[0055] For example, as shown in FIGS. 4, 5D, and 5E, the first electrode 202 and the second electrode 203 are arranged at intervals in a second direction Y intersecting the first direction X, and the maximum dimension of the first electrode 202 or the second electrode 203 in the first direction X is a first dimension K1. At least one pad 201 includes a first pad 204, the first pad 204 includes a first dimension portion 205, and the minimum distance between the first dimension portion 205 and the opening 103 in the first direction X is a second dimension K2, and the second dimension K2 satisfies K2≦0.5H1 - 0.5(K1 + 2M), and 50μm≦H1 - 2K2 - K1≦100μm.

[0056] For example, in the embodiments of the present disclosure, the case where the second direction Y intersects the first direction X will be taken as an example for description. 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 direction of the main surface of the substrate 101, and the main surface of the substrate 101 is the surface where the pads are installed. For example, the second direction Y is the arrangement direction of two pads installed opposite to the substrate. The first direction X intersects the second direction Y. For example, the first direction X can form a certain angle with the second direction, and the embodiments of the present disclosure will be described taking the case where the first direction X is perpendicular to the second direction Y as an example.

[0057] The light-emitting substrate 01 according to the embodiments of the present disclosure can have an appropriate separation distance between the pads of the light-emitting substrate 01 and the edge of the opening 103 of the reflection layer located there, can reduce the "metal intrusion phenomenon", and can reduce the inclination risk of the light-emitting element 102 installed on the pad 201, and further optimize the optical performance of the light-emitting substrate 01.

[0058] As shown in FIGS. 4 to 5D, the substrate 101 may be a printed circuit board (abbreviated as PCB) or a glass substrate. For example, the thickness range of the substrate 101 may be 0.4μm to 3μm, but is not limited thereto. For example, the thickness range of the substrate 101 may be 0.35μm to 2.5μm, but is not limited thereto. For example, the thickness of the substrate 101 may be 0.4μm, 1μm, 1.5μm, 2μm, or 3μm.

[0059] For example, the substrate 101 may include a driving circuit (not shown), the driving circuit may include thin film transistors and signal lines, and the driving circuit is configured to cause the light emitting element 102 to emit light.

[0060] As shown in FIGS. 4 to 5D, the reflective layer 100 is provided on the substrate 101, at least a part of the boundary of the reflective layer 100 overlaps with at least a part of the boundary of the substrate 101, and a plurality of openings 102 are provided in the reflective layer 100. For example, the reflective layer 100 can reflect the light rays emitted by the light emitting element 102, increase the amount of light emitted by the light emitting substrate 01 along the third direction Z perpendicular to the plane where the substrate 101 is located, and improve the light emitting efficiency of the light emitting substrate 01.

[0061] FIG. 4 shows a case where a part of the boundary of the reflective layer 100 overlaps with a part of the boundary of the substrate 101. In some embodiments, the substrate 101 may include some functional regions where the reflective layer 100 is not provided, such as the region 104 configured for circuit connection.

[0062] For example, the color of the reflective layer 100 can be selected as a color with excellent reflection characteristics, such as white.

[0063] For example, the material of the reflective layer 100 may include white oil, and the white oil may include resin (for example, epoxy resin, polytetrafluoroethylene resin), titanium dioxide (chemical formula TiO 2 ) and organic solvents (for example, dipropylene glycol methyl ether), etc., and the material of the reflective layer 100 may further include a silicone-based white adhesive. For example, when the material of the reflective layer 100 includes white oil or a silicone-based white adhesive, the white oil can be printed using a screen printing process to form the reflective layer 100. For example, the thickness range of the reflective layer 100 may be 10 μm to 300 μm, and 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 a plurality of screen printing processes.

[0064] For example, the reflective layer 100 can be formed by one or multiple screen printing processes. For example, when manufacturing the reflective layer 100 through multiple screen printing processes, by changing the size of the openings of the reflective layer 100, the manufacturing accuracy of the reflective layer 100 near the opening region can be improved. In this case, the reflective layer 100 at the edge of the opening region can exhibit a stepped shape. For example, the reflective layer 100 may further be provided with some compensation structures on the inner wall of its opening to compensate for the opening structure and improve the dimensional accuracy of the opening. For example, as the color of the compensation structure is substantially the same as that of the reflective layer 100, materials such as silicone-based white adhesives can be used, thereby having a certain ability to reflect light or being as close as possible to the reflectivity of the reflective layer 100 with respect to light rays. The present disclosure does not limit the form of the compensation structure.

[0065] For example, the reflective layer 100 may be a reflective sheet. For example, a white reflective sheet can be selected. For example, the reflective layer 100 may also be electroplating or the like. The embodiments of the present disclosure do not limit the form of the reflective layer 100.

[0066] For example, the orthographic projection of the opening 103 of the reflective layer 100 on the substrate 101 may be circular, triangular, rectangular, or the like. The embodiments of the present disclosure do not limit the shape of the opening 103.

[0067] The embodiments of the present disclosure can realize the welding of the light-emitting element 102 and the pad 201 in the reflow process, and the orthographic projection area of the opening 103 of the reflective layer 100 on the substrate 101 can be made larger than the orthographic projection area of the pad 201 on the substrate 101. For example, the orthographic projection region of the pad 201 on the substrate 101 is completely surrounded by the orthographic projection region of the opening 103 of the reflective layer 100 on the substrate 101. Thereby, the pad 201 can have a certain separation distance in the first direction X or the second direction Y of the opening 103, and the short-circuit risk caused by the "metal intrusion phenomenon" can be reduced.

[0068] For example, the pad 201 may be made of a metal material such as aluminum or copper.

[0069] As shown in FIGS. 4 to 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 larger than the maximum dimension H1 in the first direction X. The two pads 201 are arranged opposite to each other with a gap in the opening 103, and with the second direction Y as the extraction direction, the orthographic projection of the pad 201 on the substrate 101 overlaps with the orthographic projections of the two edges of the opening 103 in the second direction Y on the substrate 101. In this case, the pad 201 is separated from the opening 103 in the first direction X. In some embodiments of the present disclosure, the orthographic projection of the opening 103 on the substrate 101 may have other shapes, the two pads 201 may use the first direction X as the extraction direction, and the pad 201 is separated from the opening 103 in the second direction Y.

[0070] However, the extraction direction of the light-emitting substrate in the embodiments of the present disclosure represents the extending direction of the wiring of the signal line for communicating the light-emitting elements on the light-emitting substrate. For example, in some embodiments of the present disclosure, each pad may be used as a part of the signal line, for example, as one end of the signal line. For example, the two pads arranged opposite to each other may be used as the two ends of the two signal lines respectively, to conduct the two connection electrodes of the light-emitting element and cause the light-emitting element to emit light. For example, the extraction direction may be the first direction X shown in the embodiments of the present disclosure, or the second direction Y. For example, in some embodiments of the present disclosure, the extraction direction may be another direction intersecting the first direction X, and is not limited here.

[0071] Of course, in some embodiments of the present disclosure, the pads may be installed alone, that is, each pad is installed on the substrate as an independent conductive element and connected to the light-emitting element via a signal line to cause the light-emitting element to emit light. The embodiments of the present disclosure do not limit whether the pads and the signal lines are integrally formed.

[0072] As shown in FIGS. 4 to 5D, the light-emitting element 102 further includes a light-emitting portion 302. The light-emitting portion 302 is disposed on the side of the substrate 101 far from the first electrode 202 and the second electrode 203, and is configured to emit light in a corresponding wavelength range. A plurality of light-emitting elements 102 are arranged in an array on the substrate 101 to form a plurality of light-emitting element rows and light-emitting element columns. The plurality of light-emitting element columns are arranged in order in the first direction X, and the intervals between adjacent light-emitting element columns are substantially the same. By evenly installing the light-emitting elements, the light-emitting luminance of the light-emitting substrate becomes more uniform. Of course, the installation form of the plurality of light-emitting elements 102 is not limited to that shown in FIG. 4, and may be set as required. For example, the intervals between adjacent light-emitting element columns may not be the same, and may be set according to the specific light-emitting needs of the light-emitting substrate. The embodiments of the present disclosure are not limited thereto.

[0073] As shown in FIGS. 5A to 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, so as to be connected to the driving circuit on the substrate 101, and the driving circuit causes the light-emitting element 102 to emit light.

[0074] 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.

[0075] For example, both the first electrode 202 and the second electrode 203 of the light-emitting element 102 are made of a conductive material. For example, one of the first electrode 202 and the second electrode 203 of the light-emitting element 102 uses a metal material such as aluminum, and the material of the other of the first electrode 202 and the second electrode 203 of the light-emitting element 102 includes a conductive metal oxide such as indium tin oxide (ITO).

[0076] As shown in FIGS. 5A to 5E, for example, the connection part 105 is a welding material. For example, the connection part 105 may include solder paste and connect the light-emitting element 102 and the pad 202 in the reflow process. As is clear from the characteristics of the connection part 105, when heated and liquefied, the connection part 105 becomes paste-like, and the first electrode 202 and the second electrode 203 of the light-emitting element 102 are affected by gravity or the like, and the connection part 105 is pressed in the third direction Z. As a result, the connection part 105 after cooling forms a flat region 160 in the contact region with the first electrode 202 or the second electrode 203, and forms edge arc regions 150 on both sides of the flat region 160. The edge arc regions 150 are located on both sides of the flat region 160, and the maximum dimension M in the first direction X of the edge arc region 150 is M, and the dimension N in the second direction Y of the edge arc region 150 is substantially the same as the maximum dimension in the second direction Y of the flat region 160. For example, the size and shape of the edge arc region 150 may vary depending on the amount and different states of the connection part 105, whereby the maximum dimension M in the first direction X of the edge arc region 150 is different. For example, in some embodiments of the present disclosure, the edge arc regions 150 on both sides of the flat region 160 may have different dimensions, that is, as shown in FIG. 5B, the maximum dimensions M in the first direction of the two edge arc regions 150 located on both sides of the flat region 160 may not be equal to the maximum dimension Q.

[0077] For example, in some embodiments of the present disclosure, the dimension in the third direction Z of the connection part 105 may be different. For example, the dimension in the second direction Y of the connection part 105 may also be different. For example, the edge arc region 150 of the connection part 105 may have edges with different curvatures. For example, the shape of the edge arc region 150 of the connection part 105 may not be symmetric. Therefore, the dimension in the first direction X of the edge arc region 150 of the connection part 105 can show different degrees of difference according to the structure of the actual product or different environmental conditions, and the embodiments of the present disclosure do not limit the state of the connection part 105.

[0078] As shown in FIGS. 5C to 5F, when the light-emitting element 102 and the pad 201 are installed in cooperation, the first electrode 202 or the second electrode 203 of the light-emitting element 102 does not completely overlap with the 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 the corresponding pad 201 on the substrate 101. For example, there may be a certain non-overlapping region 206 (shown in FIG. 5E). The pad 201 includes a first pad 204, and the first pad 204 includes a first dimension portion 205.

[0079] For example, the minimum dimension of the first dimension portion 205 in the first direction X is larger 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 may be uneven such that 50 μm ≤ H1 - 2K2 - K1 ≤ 100 μm. Thereby, the first dimension portion 205 can provide a flat region with a larger dimension in the first direction X with respect to the first electrode 202 or the second electrode 203. Also, the minimum distance between the first dimension portion 205 and the opening 103 in the first direction X is the second dimension K2, and the second dimension K2 satisfies K2 ≤ 0.5H1 - 0.5(K1 + 2M). For example, K2 may be 1 / 3 to 3 / 4 of 0.5H1 - 0.5(K1 + 2M), for example, K2 may be 1 / 3 to 2 / 3 of 0.5H1 - 0.5(K1 + 2M), for example, K2 may be 1 / 2 to 2 / 3 of 0.5H1 - 0.5(K1 + 2M), for example, K2 may be 1 / 5 to 1 / 2 of 0.5H1 - 0.5(K1 + 2M).

[0080] For example, as shown in FIGS. 5A to 5E, the connection portion 105 installed between the pad 201 and the first electrode 202 or the second electrode 203 has an edge arc region 150. For example, the range of the value of the maximum dimension M of the edge arc region 150 in the first direction X may be 30 to 50 μm. Regarding the first dimension portion 205, since the dimension of the flat region 160 of the connection portion 105 in the first direction X is large and 50 μm ≤ H1 - 2K2 - K1 ≤ 100 μm, by installing the first dimension portion 205, the first electrode 202 or the second electrode 203 and the pad 202 can be sufficiently contacted, and the connection effect can be enhanced.

[0081] Therefore, when the light-emitting substrate 01 is installed in this way, an appropriate separation distance is provided between the pad 201 and the surrounding reflective layer 100, and the risk of the "metal intrusion phenomenon" can be reduced. At the same time, it promotes sufficient contact between the pad 201 and the first electrode 202 and the second electrode 203 in a large flat area, and the connection effect can be improved. The inclination probability of the light-emitting element 102 installed on the pad 201 is reduced, and the optical performance of the light-emitting substrate 01 is further optimized.

[0082] For example, as shown in FIG. 5C, the first pad 204 further includes a second dimension portion 207, and the maximum distance between the second dimension portion 207 and the opening 103 in the first direction X is the third dimension H2, and the third dimension H2 satisfies 0.5H1 - 0.6K1 ≤ H2 ≤ 0.5H1 - 0.4K1.

[0083] As shown in FIGS. 5C to 5E, with respect to the first pad 204, the second dimension portion 207 is installed on the side closer to the first center line R1 of the first dimension portion 205, and the average dimension of the second dimension portion 207 in the first direction X is less than the average dimension of the first dimension portion 205 in the first direction X. For example, the minimum dimension of the first dimension portion 205 in the first direction X may be the same as the dimension of the second dimension portion 207 in the first direction X. For example, when the orthographic projection of the substrate 101 of the light-emitting element 102 is an elongated rectangle and the orthographic projection of the substrate 101 of the light-emitting element 102 at least partially overlaps the orthographic projection of the substrate 101 of the opening 103, a non-overlapping region 206 may exist between the first electrode 202 and the second dimension portion 207 of the first pad 204, and the third dimension H2 satisfies 0.5H1 - 0.6K1 ≤ H2 ≤ 0.5H1 - 0.4K1.

[0084] For example, the possible range of H1 may be 0.3 μm to 0.4 μm, for example, the possible range of H1 may be 0.32 μm to 0.39 μm, for example, the possible range of H1 may be 0.35 μm to 0.38 μm. For example, the range of H2 may be 0.07 μm to 0.12 μm, for example, the range of H2 may be 0.08 μm to 0.10 μm, for example, the range of H2 may be 0.05 μm to 0.15 μm.

[0085] As a result, the second dimension portion 207 can further increase the distance in the first direction X between the first pad 204 and the opening 103, and can further reduce the risk of the "metal intrusion phenomenon".

[0086] Also, as shown in FIGS. 5A to 5F, when the light-emitting element 102 is displaced or tilted, the first electrode 202 or the second electrode 204 of the light-emitting element 102 may have a partially displaced region from the pad, that is, a non-overlapping region 206 (shown in FIG. 5E). In this case, as shown in FIG. 5C, by satisfying 0.5H1 - 0.6K1 ≦ H2 ≦ 0.5H1 - 0.4K1 for the third dimension H2, the first electrode 202 or the second electrode 204 contacts the edge arc region 150 of the connection portion 105 corresponding to the second dimension portion 207. Thereby, when the first electrode 202 or the second electrode 204 is displaced or tilted, it receives the tension action from the surface of the edge arc region 150 of the connection portion 105 corresponding to the second dimension portion 207, and counteracts the tendency of the first electrode 202 or the second electrode 204 to be displaced or tilted due to a reflow wind or gravity or the like.

[0087] 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 less than the dimension of the first dimension portion 205 in the first direction X (excluding the connection position of the first dimension portion 205 and the second dimension portion 207). Therefore, the second dimension portion 207 corresponds to more edge arc regions 150 that can contact the first electrode 202 or the second electrode 204 than the first dimension portion 205, and the first electrode 202 or the second electrode 204 can receive a greater surface tension generated by the edge arc region.

[0088] For example, as shown in FIG. 5F, during the welding process, if the light-emitting element 102 is inclined or tends to be inclined, due to the tension in the edge arc region 150 of the connection portion 105 corresponding to the second dimension portion 207, the position of the light-emitting element 102 can be corrected, and the portion located in the deviation region 213 of the light-emitting element 102 can be reduced until the balance of the tension of the connection portion 105 is reached. Thereby, the light-emitting element 102 can be restored or substantially restored from the deviation state shown in FIG. 5F to the normal state shown in FIG. 5E. That is, the edge arc region 150 of the connection portion 105 corresponding to the second dimension portion 207 can pull the light-emitting element 102 back to the central position or a position close to the center by the action of its tension.

[0089] However, the situation of the displacement of the light-emitting element shown in FIG. 5F is merely exemplary, and this state is an intermediate situation that may occur during the installation process of the light-emitting substrate according to the embodiments of the present disclosure, rather than the final state. In some embodiments of the present disclosure, for example, the possible displacement amount of the light-emitting element may not be the same as the displacement amount shown in FIG. 5F. For example, the possible displacement direction of the light-emitting element may be different from the displacement direction shown in FIG. 5F, and the embodiments of the present disclosure are not limited thereto.

[0090] Therefore, by installing the second dimension portion 207 in this way, the risk of the "metal intrusion phenomenon" can be further reduced, and at the same time, the probability of the first electrode 202 or the second electrode 204 being displaced or inclined can be reduced.

[0091] For example, as shown in FIGS. 5C to 5E, at least one pad 201 further includes a second pad 208, the first pad 204 and the second pad 208 are distributed at intervals, and are symmetric with respect to the first center line R1 located between the first pad 204 and the second pad 208 (shown in FIG. 5C).

[0092] For example, as shown in FIG. 5C, the first center line R1 extends in the first direction X. As shown in FIG. 5C, the first center line R1 does not overlap with the first pad 204, nor does it overlap with the second pad 208. As shown in FIG. 5C, the first pad 204, the first center line R1, and the second pad 208 are arranged in sequence in the second direction Y.

[0093] As shown in FIG. 5D, 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.

[0094] As shown in FIG. 5D, the second center line R2 extends in the first direction X. As shown in FIG. 5D, the second center line R2 does not overlap with the first electrode 202 nor with the second electrode 203. As shown in FIG. 5D, the first electrode 202, the second center line R2, and the second electrode 203 are arranged in order in the second direction Y.

[0095] For example, in the embodiments of the present disclosure, the first center line R1 and the second center line R2 are virtual lines and may not exist in the actual product. For example, in the embodiments of the present disclosure, the members installed on both sides of each center line (for example, the first pad 204 and the second pad 208 installed on both sides of the first center line R1, or the first electrode 202 and the second electrode 203 installed on both sides of the second center line R2) do not have to be installed exactly symmetrically, that is, they are approximately symmetric within a certain error range. For example, the symmetry error of each member installed on both sides of the center line may be 3% - 10%, and the embodiments of the present disclosure are not limited thereto. For example, as shown in FIGS. 5C and 5E, at least one pad 201 is installed on the side of the substrate 101 close to the first electrode 202 and the second electrode 203. The minimum distance in the second direction Y between the first electrode 202 and the second electrode 203 is the fourth dimension Z, and the minimum distance in the second direction Y between the first pad 204 and the second pad 208 is the fifth dimension D. By 0.9Z ≦ D ≦ Z, the light-emitting element 102 is less likely to tilt or shift due to the tension of the connection portion 105.

[0096] As shown in FIGS. 5C to 5E, the shapes of the orthographic projections of the first pad 204 and the second pad 208 on the substrate 101 are the same, the dimensions are also the same, and they are symmetrically distributed with respect to the first center line R1. In some embodiments of the present disclosure, the shapes and dimensions of the orthographic projections of the first pad 204 and the second pad 208 on the substrate 101 may be different and are not limited thereto. In the second direction, the first pad 204 and the second pad 208 are distributed at intervals to avoid the phenomenon of circuit short - circuit. For example, the value range of the fifth dimension D in the second direction Y of the first pad 204 and the second pad 208 may be 0.1 μm to 0.4 μm, for example, the value range of the fifth dimension D may be 0.12 μm to 0.25 μm, for example, the value range of the fifth dimension D may be 0.13 μm to 0.20 μm. Similarly, the first electrode 202 and the second electrode 203 are distributed at intervals. For example, the value range of the fourth dimension Z in the second direction Y of the first electrode 202 and the second electrode 203 may be 0.1 μm to 0.3 μm, for example, the value range of the dimension D may be 0.12 μm to 0.20 μm, for example, the value range of the fifth dimension D may be 0.13 μm to 0.15 μm.

[0097] As shown in FIGS. 5C to 5E, when the light - emitting element 102 is installed on the side far from the substrate 101 of the pad 201, the fourth dimension Z and the fifth dimension D satisfy 0.9Z ≦ D ≦ Z, that is, the fifth dimension D is less than or equal to the fourth dimension Z.

[0098] For example, as shown in FIGS. 5C to 5E, since the fifth dimension D is less than the fourth dimension Z, the orthographic projection on the substrate at the end of the first pad 204 close to the first center line R1 includes a portion not covered by the orthographic projection of the first electrode 202 on the substrate. As shown in FIG. 5E, in the second direction Y, the first electrode 202 is farther from the first center line R1 than the first pad 204. At the same time, the dimensions of the first electrode 202 and the first pad 204 in the first direction X close to the first center line R1 are not very different. As shown in FIG. 5E, the dimension of the first electrode 202 in the first direction X is slightly less than the dimension of the first pad 204 in the first direction X. Thereby, the light-emitting element 102 is less likely to tilt or shift due to the tension of the connection portion 105, and the light-emitting substrate 01 can have good optical performance.

[0099] For example, as shown in FIGS. 5A to 5E, the minimum distance in the second direction Y between the first dimension portion 205 and the first center line R1 is the sixth dimension C1, the minimum distance in the second direction Y between the second dimension portion 207 and the first center line R1 is the seventh dimension C2, and the maximum distance in the second direction Y between the first electrode 201 and the second center line R2 is the eighth dimension Y1. Since Y = MAX(C1, C2), it is advantageous to improve the installation effect of the light-emitting element 102 on the first pad 204 and reduce the probability that the light-emitting element 102 installed on the pad tilts or shifts.

[0100] As shown in FIGS. 5A to 5E, a sixth dimension C1 in the second direction Y between the first dimension portion 205 and the first center line R1, and a seventh dimension C2 in the second direction Y between the second dimension portion 207 and the first center line R1 satisfy Y = MAX(C1, C2), and the difference between the sixth dimension C1 and the seventh dimension C2 is substantially the same as the dimension of the first electrode 202 or the second electrode 203 in the second direction Y. For example, the boundary line 214 far from the second center line R2 of the first electrode 202 is substantially installed at the end close to the first center line R1 of the first dimension portion 205 of the first pad 204. In this way, the first dimension portion 205 can provide a large installation area for the first electrode 202, and the first electrode 202 can be installed in the flat area 160 of the connection portion 105 as far as possible in the direction away from the second center line R2 in the second direction Y, improving the installation effect of the light-emitting element 102 on the first pad 204, and being advantageous for reducing the probability that the light-emitting element 102 installed on the pad tilts or shifts.

[0101] Having an appropriate separation distance between the pad and the surrounding reflective layer, reducing the risk of the "metal intrusion phenomenon", effectively avoiding the phenomenon that the light-emitting element installed on the pad tilts or shifts, and optimizing the optical performance of the light-emitting substrate, the pads in the embodiments of the present disclosure may be installed in various forms according to actual design needs.

[0102] For example, as shown in FIGS. 5A to 5C, in the second direction Y, the maximum distance between the edge of the first pad 204 far from the second pad 208 and the edge of the second pad 208 far from the first pad 204 is the same as the maximum dimension of the opening 103. The first dimension portion 205 and the second dimension portion 207 each include opposite first ends 209 and second ends 210, and the first end 209 of the first dimension portion 205 is closer to the first center line R1 than the second end 210 of the first dimension portion 205, and the first end 211 of the second dimension portion 207 is closer to the first center line R1 than the second end 212 of the second dimension portion 207.

[0103] As shown in FIGS. 5A to 5C, the maximum distance between the edge of the first pad 204 far from the second pad 208 and the edge of the second pad 208 far from the first pad 204 is the same as the maximum dimension of the opening, both being C3. The pad 201 installed in this way has the second direction Y as the drawing direction, and in the first direction X, the pad 201 is away from the opening 103. For example, the first ends of the first dimension part 205 or the second dimension part 207 are respectively boundary lines close to the first center line R1 of the first dimension part 205 or the second dimension part 207, and the second ends of the first dimension part 205 or the second dimension part 207 are respectively boundary lines far from the first center line R1 of the first dimension part 205 or the second dimension part 207, so that the first ends of the first dimension part 205 or the second dimension part 207 are closer to the first center line R1 than the second ends. For example, in some embodiments of the present disclosure, the boundary line of the orthographic projection of the first dimension part 205 or the second dimension part 207 on the substrate 101 may not be a straight line, and may include, for example, an arc line, etc., and is not limited thereto.

[0104] For example, as shown in FIGS. 5A to 5C, in the first direction X, the minimum distance between the first dimension part 205 and the opening 103 is the second dimension K2, and the maximum distance between the first end 211 of the second dimension part 207 and the opening is the third dimension H2.

[0105] As shown in FIGS. 5A to 5C, the first pad 204 includes a first dimension part 205 and a second dimension part 207 to be connected, and the first dimension part 205 is installed at one end far from the first center line R1 of the second dimension part 207. In some embodiments of the present disclosure, according to the actual pad design needs, if the first dimension part 205 and the second dimension part 207 are electrically connected, there may be a certain gap between the first dimension part 205 and the second dimension part 207, and the embodiments of the present disclosure do not limit the size and shape of the gap.

[0106] For example, as shown in FIG. 5C, in addition to the first dimension portion 205 and the second dimension portion 207, the first pad 204 may include other portions such as a third connection portion 2171 in order to electrically connect the first pad 204 and a circuit structure other than the opening 103. For example, the dimension of the third connection portion 2171 in the second direction may be less than the dimension of the first dimension portion 207 in the second direction. For example, the dimension of the third connection portion 2171 in the first direction may be greater than the dimension of the first dimension portion 207 in the first direction, further widening the range of the flat region 160 of the connection portion 105 and enhancing the stability of the light-emitting element 102 installed on the side of the first pad 204 far from the substrate 101.

[0107] As shown in FIGS. 5A to 5C, in the second direction Y, when the first dimension portion 205 extends from the first end 209 to the second end 210, the dimension of the first dimension portion 205 in the first direction X gradually increases, and the distance between the first dimension portion 205 and the opening 103 in the first direction X gradually decreases. In this case, compared with other portions of the first dimension portion 205, 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. Since the orthographic projections of the second dimension portion 207 and the first dimension portion 205 on the substrate 101 have similar shape characteristics, compared with other portions of the second dimension portion 207, 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. In the first pad 204, the dimension of the first end 211 of the second dimension portion 207 in the first direction X is the smallest. Thereby, the first pad 204 of the structure can maintain a certain separation distance from the opening 103, and the occurrence of the "metal intrusion phenomenon" can be reduced. The first dimension portion 205 can be installed on the side far from the first center line R1 of the second dimension portion 207, and since the flat region 160 of the connection portion 105 installed thereon can be widened, the risk of the light-emitting element 102 shifting can be reduced.

[0108] For example, as shown in FIG. 5C, the orthographic projections of the first dimension portion 205 and the first dimension portion 207 on the substrate 101 may both be trapezoidal.

[0109] FIG. 6A is a schematic structural diagram of pads of another light-emitting substrate according to an embodiment of the present disclosure, FIG. 6B is a schematic structural diagram of pads of yet another light-emitting substrate according to an embodiment of the present disclosure, FIG. 6C is a schematic structural diagram of pads of still yet another light-emitting substrate according to an embodiment of the present disclosure, FIG. 6D is a schematic structural diagram of pads of still yet another light-emitting substrate according to an embodiment of the present disclosure, FIG. 6E is a schematic structural diagram of pads of still yet another light-emitting substrate according to an embodiment of the present disclosure, FIG. 6F is a schematic structural diagram of pads of still yet another light-emitting substrate according to an embodiment of the present disclosure, FIG. 6G is a schematic structural diagram of pads of still yet another light-emitting substrate according to an embodiment of the present disclosure, FIG. 6H is a schematic structural diagram of pads of still yet another light-emitting substrate according to an embodiment of the present disclosure, and FIG. 7 is a schematic structural diagram of pads of still yet another light-emitting substrate according to an embodiment of the present disclosure.

[0110] For example, as shown in FIGS. 5A and 6A, the orthographic projection of the first dimension portion 205 on the substrate 101 may further be rectangular, and the dimension of the first dimension portion 205 in the first direction X is larger 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 may be trapezoidal, and the second dimension portion 207 includes an upper bottom portion 215 and a lower bottom portion 216 parallel to the first center line R1. The distance between the upper bottom portion 215 and the opening 103 in the first direction X is larger than the distance between the lower bottom portion 216 and the opening 103 in the first direction X. As shown in FIG. 6A, the length of the upper bottom portion 215 is less than the length of the lower bottom portion 216.

[0111] As shown in FIGS. 5A and 6A, in the first direction X, both the first dimension portion 205 and the second dimension portion 207 have a certain distance from the opening 103, and the distance between the first dimension portion 205 and the opening 103 in the first direction X is generally less than the distance between the second dimension portion 207 and the opening 103 in the first direction X. Therefore, the first pad 204 can reduce the risk of "metal intrusion phenomenon".

[0112] As shown in FIGS. 5A, 5B and 6A, the upper bottom 215 of the second dimension part 207 whose orthographic projection on the substrate 101 is trapezoidal is the first end 211, the lower bottom 216 of the second dimension part 207 is the second end 212, and the distance in the first direction X between the upper bottom 215 and the opening 103 is greater than the distance in the first direction X between the lower bottom 216 and the opening 103. Therefore, the upper bottom 215 corresponds to more edge arc regions 150 that can contact the first electrode 202 or the second electrode 204. Thereby, the first electrode 202 or the second electrode 204 can receive a greater tensile force generated by the edge arc region 150, limit the displacement of the light-emitting element 102, and improve the optical performance of the light-emitting substrate 01.

[0113] Here, regarding the principle of avoiding the "metal intrusion phenomenon" and improving the optical performance of the light-emitting substrate by reasonably installing the first pad 204, reference can be made to the related descriptions in the above embodiments, and details will not be elaborated here.

[0114] For example, as shown in FIGS. 5A and 6B, the orthographic projections of the first dimension part 205 and the second dimension part 207 on the substrate 101 are both rectangular, the dimension of the first dimension part 205 in the first direction X is greater than the dimension of the first dimension part 205 in the second direction Y, and the dimension of the second dimension part 207 in the first direction X is greater than the dimension of the second dimension part 207 in the second direction Y.

[0115] For example, as shown in FIGS. 5A and 6B, the first pad 204 further includes a third dimension part 217. The third dimension part 217 includes opposite first end 218 and second end 219. And in the second direction Y, the first end 218 of the third dimension part 217 is connected to the second end 210 of the first dimension part 205. The orthographic projection of the second end 219 of the third dimension part 217 on the substrate 101 overlaps with the orthographic projection of the opening 103 on the substrate 101, and the dimension of the third dimension part 217 in the second direction Y is less than the dimension of the first dimension part 205 in the second direction Y.

[0116] For example, as shown in FIGS. 5A and 6B, compared with the pad shown in FIG. 6A, a third dimension portion 217 is added to the pad shown in FIG. 6B. The orthographic projection of the second dimension portion 207 on the substrate 101 is rectangular, and the dimension of the second end 212 of the second dimension portion 207 in the first direction X is less than the dimension of the first end 209 of the first dimension portion 205 in the first direction X. The dimension of the first dimension portion 205 in the second direction Y is larger than the dimensions of the second dimension portion 207 and the third dimension portion 217 in the second direction Y. Thereby, the flat region 160 of the connection portion 105 installed on the side of the first dimension portion 205 away from the substrate 101 can be widened, promoting sufficient contact between the pad 201 and the large flat region 160 of the first electrode 202 and the second electrode 203 (see FIG. 5B), forming an effective connection, reducing the inclination probability of the light-emitting element 102 (see FIG. 5B) installed on the pad 201, and further optimizing the optical performance of the light-emitting substrate 01.

[0117] The dimension of the third dimension portion 217 in the first direction X is small. For example, the dimension of the third dimension portion 217 in the first direction X may be less than the dimensions of the first dimension portion 205 and the third dimension portion 217 in the first direction, and the dimension of the third dimension portion 217 in the first direction X being less than the dimension of the first dimension portion 205 in the first direction X can further reduce the risk of the "metal intrusion phenomenon". The embodiments of the present 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 may be a regular polygon, or for example, the orthographic projection of the third dimension portion 217 on the substrate 101 may include an arc-shaped structure.

[0118] For example, as shown in FIGS. 5A and 6C, the dimension of the second dimension portion 207 in the first direction X can gradually increase from the first end 211 to the second end 212 of the second dimension portion 207, and the dimension of the second end 212 of the second dimension portion 207 in the first direction X is the same as the dimension of the first end 209 of the first dimension portion 205 in the first direction X.

[0119] Compared with the pad shown in FIG. 6B, the pad shown in FIG. 6C has an irregular arc-shaped structure in the orthographic projection of the second dimension portion 207 on the substrate 101, and all other structures are the same.

[0120] As shown in FIGS. 5A and 6C, the dimension of the second dimension portion 207 in the first direction X gradually increases from the first end 211 to the second end 212 until it becomes the same as the dimension of the first end 209 of the first dimension portion 205 in the first direction X. For example, in some embodiments of the present disclosure, by designing the dimension of the second dimension portion 207 in the first direction X to change gradually, the connection portion 105 portion installed on the side far from the substrate 101 of the second dimension portion 207 and the connection portion 105 portion on the side far from the substrate 101 of the first dimension portion 205 can be well connected. By making the flat region 150 of the connection portion 105 wider, the installation effect of the light-emitting element 102 can be optimized, and the probability of the light-emitting element 102 being displaced or tilted can be reduced.

[0121] Of course, the embodiments of the present disclosure are not limited thereto. For example, as long as 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 needs and is not limited thereto.

[0122] For example, as shown in FIGS. 5A and 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 the orthographic projection of the opening 103 on the substrate 103.

[0123] As shown in FIGS. 5A and 6D, the first dimension part 205 is installed on the side closer to the first center line R1 of the second dimension part 207. Therefore, in the first direction X, the dimension tends to decrease from the end closer to the first center line R1 to the end farther from the first center line R1 of the first pad 204. When the light-emitting element 102 is installed on the side farther from the substrate 101 of the first pad 204, the second dimension part 207 restricts the deviation or inclination of the part farther from the first center line R1 of the light-emitting element 102, and the first dimension part 205 acts on the part closer to the first center line R1 of the light-emitting element 102. And it is advantageous for the connecting part 105 to provide a large flat area 150 for the light-emitting element 102. Also, by installing the pad structure in this way, it can similarly play a role in reducing the "metal intrusion phenomenon".

[0124] For example, as shown in FIG. 6D, the orthographic projection of the first dimension part 205 on the substrate 101 may be a rectangle. The dimension of the first dimension part 205 in the first direction X is larger than the dimension of the first dimension part 205 in the second direction Y. The orthographic projection of the second dimension part 207 on the substrate 101 may also be a rectangle. The dimension of the second dimension part 207 in the first direction X is less than the dimension of the second dimension part X in the second direction Y. The first dimension part X is connected to the second dimension part 207.

[0125] As shown in FIG. 6D, since the orthographic projections of the first dimension part 205 and the second dimension part 207 on the substrate 101 are both rectangles, the dimension of the first pad 204 in the first direction X decreases step by step from the end closer to the first center line R1 to the end farther from the first center line R1. For example, the dimension of the second dimension part 207 in the first direction X may be different from the state shown in FIG. 6D. For example, as shown in FIGS. 5A and 6D, when the probability of the light-emitting element 102 tilting or shifting is high, by relatively increasing the dimension of the second dimension part 207 in the second direction Y and relatively decreasing the dimension of the first dimension part 205 in the second direction Y, the limiting effect on the possible tilting and shifting of the light-emitting element 102 can be enhanced.

[0126] As shown in FIG. 6D, in the second direction Y, the first dimension part 205 is installed directly adjacent to the second dimension part 207 and is directly connected to the first end 211 of the second dimension part 207 via the second end 210 of the first dimension part 205. For example, in some embodiments of the present disclosure, the first dimension part 205 may be indirectly connected to the second dimension part 207. For example, other structures of the first pad 204 may be installed between the first dimension part 205 and the second dimension part 207, and the embodiments of the present disclosure are not limited thereto.

[0127] For example, as shown in FIGS. 5A and 6E, the first pad 204 further includes a third dimension part 217. The third dimension part 217 includes opposite first end 218 and second end 219. In the second direction Y, the first end 218 of the third dimension part 217 is connected to the second end 210 of the first dimension part 205, the second end 219 of the third dimension part 217 is connected to the first end 211 of the second dimension part 207. The dimension of the third dimension part 217 in the first direction X gradually decreases from the first end 218 of the third dimension part 217 to the second end 219 of the third dimension part 217. The dimension of the first end 218 of the third dimension part 217 in the first direction X is the same as the dimension of the second end 210 of the first dimension part 205 in the first direction X, and the dimension of the second end 219 of the third dimension part 217 in the first direction X is the same as the dimension of the first end 211 of the second dimension part 207 in the first direction X.

[0128] As shown in FIGS. 5A, 5B, and 6E, in the second direction Y, the 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. By the dimension of the third dimension portion 217 in the first direction X gradually decreasing from the first end 218 of the third dimension portion 217 to the second end 219 of the third dimension portion 217, it can function as a transition region for the dimension change between the first dimension portion 205 and the second dimension portion 207 in the first direction X. Compared with the pad structure in FIG. 6D, the pad structure in FIG. 6E can widen the flat region 160 of the connection portion 105 disposed on the side far from the substrate 101 of the first dimension portion 205 and the third dimension portion 217, optimize the installation state of the light-emitting element 102, reduce the inclination probability of the light-emitting element 102, and further optimize the optical performance of the light-emitting substrate 01.

[0129] For example, as shown in FIGS. 5A and 6E, the orthographic projection of the third dimension portion 217 on the substrate 101 may be trapezoidal.

[0130] For example, as shown in FIGS. 5A and 6E, the orthographic projection of the third dimension portion 217 on the substrate 101 may be other shapes. For example, the orthographic projection of the third dimension portion 217 on 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 on the substrate 101 may be straight lines, may be curves or arcs, whereby the third dimension portion 217 may have various structural forms, and the embodiments of the present disclosure are not limited thereto.

[0131] For example, as shown in FIG. 6F, in the first direction X, the maximum dimension of the second end 210 of the first dimension portion 205 is the same as the maximum dimension of the first end 211 of the second dimension portion 207, and the second end 210 of the first dimension portion 205 is connected to the first end 211 of the second dimension portion 207, and the maximum dimension of the first dimension portion 205 in the first direction X gradually decreases from the first end 209 of the first dimension portion 205 to the second end 210 of the first dimension portion 205.

[0132] For example, as shown in FIG. 6F, the first pad 204 further includes a third dimension portion 217. The third dimension portion 217 includes opposite first end 218 and second end 219. And in the second direction Y, the second end 219 of the third dimension portion 217 abuts against 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 toward the second end 219 of the third dimension portion 217.

[0133] For example, as shown in FIGS. 5A and 6F, the first pad 204 includes a first dimension portion 205, a second dimension portion 207, and a third dimension portion 217. In the second direction Y, the third dimension portion 217, the first dimension portion 205, and the second dimension portion 207 are arranged in sequence. The third dimension portion 217 is installed on the side closer to the first center line R1 of the first dimension portion 205, and the second dimension portion 207 is installed on the side farther from the first center line R1 of the first dimension portion 205. The orthographic projection of the second end 212 of the second dimension portion 207 on the substrate overlaps with the orthographic projection of the opening 103 on the substrate. For example, the dimension of the second dimension portion 207 in the first direction X may be uniform or non-uniform, and the embodiments of the present disclosure are not limited thereto. For example, if the two are electrically connected, the dimension of the first end 211 of the second dimension portion 207 in the first direction X may be the same as or different from that of the second end 210 of the first dimension portion 205, and the embodiments of the present disclosure are not limited thereto. The dimension of the first dimension portion 205 in the first direction X may be non-uniform, and in the second direction Y, the dimension of the first dimension portion 205 gradually decreases from the first end 209 toward the second end 210.

[0134] For example, as shown in FIGS. 5A and 6F, the orthographic projection of the first dimension portion 205 on the substrate 101 may be a regular polygon or may include an irregular shape, and the present disclosure is not limited thereto. For example, the orthographic projections of the third dimension portion 217 and the first dimension portion 205 on the substrate 101 have similar shape characteristics.

[0135] For example, as shown in FIGS. 5A and 6F, the orthographic projection of the first dimension portion 205 on the substrate 101 may be a trapezoid, and the orthographic projection of the third dimension portion 217 on the substrate 101 may also be a trapezoid.

[0136] As shown in FIG. 6F, the dimension of the second end 219 of the third dimension portion 217 in the first direction X is the same as the dimension of the first end 209 of the first dimension portion 205 in the first direction X, and the included angles between the first end 209 of the first dimension portion 205 and the hypotenuses on both sides thereof are the same. The included angles between the first end 218 of the third dimension portion 217 and the hypotenuses on both sides thereof are also the same and are equal to the included angles between the first end 209 of the first dimension portion 205 and the hypotenuses on both sides thereof. For example, in some embodiments of the present disclosure, the included angles between the first end 209 of the first dimension portion 205 and the hypotenuses on both sides thereof may not be the same. For example, the slopes of the hypotenuses on both sides of the first end 218 of the third dimension portion 217 and the slopes of the hypotenuses on both sides of the first end 209 of the first dimension portion 205... may be... For example, the dimension of the second end 219 of the third dimension portion 217 in the first direction X may not be the same as the dimension of the first end 209 of the first dimension portion 205 in the first direction X, and the embodiments of the present disclosure are not limited thereto.

[0137] When installed in this way, the third dimension portion 217 can further widen the range of the flat region 160 of the connection portion 105, reduce the occurrence probability of the "metal intrusion phenomenon", and at the same time optimize the installation state of the light emitting element 102, reduce the inclination probability of the light emitting element 102, and further optimize the optical performance of the light emitting substrate 01.

[0138] For example, as shown in FIGS. 5A and 6G, compared with the pad structure shown in FIG. 6F, the connection side portion 291 between the orthographic projection of the second end 210 of the first dimension portion 205 of the pad shown in FIG. 6G 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.

[0139] For example, as shown in FIGS. 5A and 6G, the connection side portion 291 between the orthographic projection of the second end 210 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 portion 2911 and a second side portion 2912, and the orthographic projections of the first side portion 2911 and the second side portion 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 the same as 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. By properly abutting the second end 219 of the third dimension portion 217 and the first end 209 of the first dimension portion 205, it can help to widen the range of the flat region 160 of the connection portion 105, optimize the installation state of the light-emitting element 102, and reduce the inclination probability of the light-emitting element 102.

[0140] For example, in some embodiments of the present disclosure, the curvatures of the first side portion 2911 and the second side portion 2912 may not be the same, and the first side portion 2911 and the second side portion 2912 may not be symmetric. For example, according to actual design needs, the dimension of the third dimension portion 217 in the second direction Y may not be the same as 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.

[0141] Of course, the embodiments of the present disclosure are not limited thereto, and the orthographic projections of the first dimension portion 205 or the third dimension portion 217 on the substrate 101 may have other shapes and are not limited here.

[0142] For example, as shown in FIG. 6H, 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.

[0143] For example, as shown in FIGS. 5A and 6H, the first pad 204 further 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 opposite 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 of the third dimension portion 217. 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 of the fourth dimension portion 222. The dimension of the second end 224 of the fourth dimension portion 222 in the first direction X is the same as the dimension of the first end 209 of the first dimension portion 205 in the first direction X.

[0144] As shown in FIGS. 5A and 6H, the first pad 204 includes a first dimension portion 205, a second dimension portion 207, a third dimension portion 217, and a fourth dimension portion 222. In the second direction Y, the fourth dimension portion 222, the first dimension portion 205, the second dimension portion 207, and the third dimension portion 217 are arranged in sequence, and the distance between the fourth dimension portion 222 and the first central symmetry line R1 is the smallest. The dimensions of the first dimension portion 205 and the opening 103 in the first direction X increase sequentially from the first end 209 to the second end 210. The fourth dimension portion 222 is connected to the first end 209 of the first dimension portion 205 at the second end 224. Thereby, the range of the flat region 160 of the connection portion 105 can be made wider, the stability of the light-emitting element 102 installed on the far side of the substrate 105 by the first pad 204 can be improved, and the probability of tilting or displacement can be reduced.

[0145] For example, as shown in FIGS. 5A, 5D, and 6H, 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 of the third dimension portion 217, and is connected to the second end 212 of the second dimension portion 207 via the first end 218. The average dimension of the third dimension portion 217 in the first direction X is less than the average dimension of the second dimension portion 207 in the first direction X. Thus, when the first electrode 202 of the light-emitting element 102 is installed on the side far from the substrate 101 of the first pad 204, the boundary line 214 of the first electrode 202 extending in the first direction X, far from the second center line R2, is located near the first end 218 of the third dimension portion 217. Therefore, in the first pad 204 installed in this way, the third dimension portion 217 can enhance the ability to limit the displacement of the light-emitting element 102, and the optical performance of the light-emitting element 102 can be optimized.

[0146] For example, as shown in FIG. 6H, 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.

[0147] For example, as shown in FIGS. 5A, 5D, and 6H, in some embodiments of the present 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 on the substrate 101 may be other shapes. For example, the connecting side portions connecting the respective first ends and second ends of the first dimension portion 205, the second dimension portion 207, the third dimension portion 217, and the fourth dimension portion 222 may be straight lines or curves. For example, the connecting side portions connecting the respective first ends and second ends of the first dimension portion 205, the second dimension portion 207, the third dimension portion 217, and the fourth dimension portion 222 may include broken lines or arc lines, etc., and the embodiments of the present disclosure are not limited thereto.

[0148] For example, as shown in FIGS. 5A and 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 needs. For example, by increasing the dimension of the first dimension portion 205 in the second direction Y, the range of the flat region 160 of the connection portion 105 installed on the side far from the substrate 101 can be widened. Thereby, the structure of the first pad 204 can be set in various and flexible ways, and the optical performance of the light-emitting element 102 can be optimally improved.

[0149] For example, as shown in FIG. 7, in the first direction X, the maximum dimension of the first dimension portion 205 is the same as the maximum dimension of the opening 103. The first dimension portion 205 and the second dimension portion 207 each include a first end and a second end facing each other. The first end 209 of the first dimension portion 205 and the first end 211 of the second dimension portion 207 are installed on the side closer to the first center line R1, and the minimum distance in the second direction Y between the second end 210 of the first dimension portion 205 and the opening 103 is substantially the same as the dimension of the first dimension portion 205 in the second direction Y.

[0150] As shown in FIG. 7, the maximum dimension of the first dimension portion 205 in the first direction X is the same as the maximum dimension of the opening 103 in the first direction X. The second dimension portion 207 is installed on the side far from the first center line R1 in the second direction Y of the first dimension portion 205. Thereby, the lead-out direction of the first pad 204 shown in FIG. 7 is the first direction X. Therefore, the first pad 204 designed in this lead-out method keeps a certain distance from the opening 103 in the second direction Y to prevent the occurrence of the "metal intrusion phenomenon".

[0151] As shown in FIGS. 5A to 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), and the difference between the sixth dimension C1 and the seventh dimension C2 is substantially the same as the dimension of the first electrode 202 or the second electrode 203 in the second direction Y. Therefore, when the design conditions are met, the dimension of the first dimension portion 205 in the second direction Y can be set according to the actual design situation, and the embodiments of the present disclosure are not limited thereto.

[0152] For example, as shown in FIG. 7, the minimum distance in the second direction Y between the second end 210 of the first dimension portion 205 and the opening 103 may be substantially the same as the dimension of the first dimension portion 205 in the second direction. Thereby, the connection portion 105 on the side of the first dimension portion 205 far from the substrate can have a large flat region, and at the same time, the overall laying area of the first pad 204 can be reduced, and the manufacturing cost can be further reduced.

[0153] Of course, the embodiment of the present disclosure is not limited to the structural form when the drawing-out direction of the first pad 204 is the first direction X, and a third dimension portion and / or a fourth dimension portion, etc. may be added to the first pad 204 according to actual design needs. In addition, since the structural form of each dimension portion can be set according to the actual situation, the design of the first pad 204 becomes more flexible, and the optical performance of the light-emitting element can be optimized better.

[0154] For example, as shown in FIG. 7, the dimension of the first dimension portion 205 in the first direction X is larger than the dimension of the first dimension portion 205 in the second direction Y, and the dimension of the second dimension portion 207 in the second direction Y gradually increases from the first end 211 to the second end 212 of the second dimension portion 207.

[0155] For example, the orthographic projection of the first dimension portion 205 on the substrate 101 may be a rectangle, and the orthographic projection of the second dimension portion 207 on the substrate 101 may be a trapezoid.

[0156] For example, as shown in FIGS. 5D to 7, the distance in the first direction X between the first end 211 of the second dimension portion 207 and the opening 103 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 close to the first center line R1 of the second dimension portion 207 in the first direction X. Therefore, the first pad 204 having this structure can limit the displacement or inclination of the light-emitting element 102.

[0157] As shown in FIG. 7, the dimension of the second dimension portion 207 in the second direction Y gradually increases from the first end 211 to the second end 212 of the second dimension portion 207, and the second end 212 of the second dimension portion 207 is connected to the first end 209 of the first dimension portion 205, so that the flat region of the connection portion installed between the first pad 204 and the light emitting element can be widened, and the installation effect of the light emitting element can be optimized.

[0158] For example, the second dimension portion 207 may have other structures, and the embodiments of the present disclosure are not limited thereto.

[0159] However, in each of the above embodiments, for the same first pad, since each dimension portion included can be integrally formed with the dimension portion adjacent to the dimension portion, the process is simplified and the manufacturing cost is reduced. For example, in the same first pad, all dimension portions are integrally formed.

[0160] As shown in FIGS. 5C to 5E, an embodiment of 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 connection portion 105. The reflective layer 100 is installed on the substrate 101, the reflective layer 100 includes an opening 103, and the orthographic projection of at least one pad 201 on the substrate 101 at least partially overlaps the orthographic projection of the opening 103 on the substrate 101. At least one pad 201 includes a first pad 204 and a second pad 208, and the first pad 204 and the second pad 208 are symmetrically distributed with respect to a first center line R2 located between the first pad 204 and the second pad 208.

[0161] As shown in FIGS. 5C to 5E, the light emitting element 102 is installed on the substrate 101, the orthographic projection of the light emitting element 102 on the substrate 101 at least partially overlaps 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, and 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.

[0162] As shown in FIG. 5B, the connection portion 105 is disposed between at least one pad 201 and the light-emitting element 102, and is configured to connect the at least one pad 201 and the light-emitting element 102.

[0163] For example, the first pad 204 is disposed on the side closer to one substrate 101 of the first electrode 202 and the second electrode 203, the second pad 208 is disposed on the side farther from the other substrate 101 of the first electrode 202 and the second electrode 203, the minimum distance in the arrangement direction between the first electrode 202 and the second electrode 203 is the fourth dimension Z, the minimum distance in the arrangement direction between the first pad 204 and the second pad 208 is the fifth dimension D, and 0.9Z ≤ D ≤ Z.

[0164] As shown in FIGS. 5C to 5E, the first pad 204 and the second pad 208 are distributed at intervals in the second direction Y, the first electrode 202 and the second electrode 203 are also distributed at intervals in the second direction Y, and the light-emitting element 102 is disposed on the side farther from the substrate 101 of the pad 201.

[0165] As shown in FIGS. 5C to 5E, when the light-emitting element 102 is disposed on the side farther from the substrate 101 of the pad 201, the fourth dimension Z and the fifth dimension D satisfy 0.9Z ≤ D ≤ Z, that is, the fifth dimension D is less than or equal to the fourth dimension Z. Thereby, the light-emitting element 102 is less likely to tilt or shift due to the tension of the connection portion 105, and the light-emitting substrate 01 can have good optical performance.

[0166] Here, for the structural features of the light-emitting substrate 01, reference can be made to the related descriptions of the above embodiments, and details are not described herein.

[0167] For example, as shown in FIGS. 5A to 5E, an embodiment of 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 connection portion 105. The reflective layer 100 is disposed on the substrate 101, and the reflective layer 100 includes an opening 103.

[0168] For example, as shown in FIGS. 5A to 5E, the orthographic projection of at least one pad 201 on the substrate 101 overlaps at least partially 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, and the first pad 204 and the second pad 208 are symmetrically distributed with respect to a first center line R2 located between the first pad 204 and the second pad 208.

[0169] For example, as shown in FIGS. 5A to 5E, the light-emitting element 102 is installed on the substrate 101, and the orthographic projection of the light-emitting element 102 on the substrate 101 overlaps at least partially 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, and 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.

[0170] For example, as shown in FIG. 5B, the connection portion 105 is installed between at least one pad 201 and the light-emitting element 102 and is configured to connect the at least one pad 201 and the light-emitting element 102.

[0171] For example, as shown in FIGS. 5A to 5E, the first pad 204 is installed on the side closer to one of the first electrode 202 and the second electrode 203 on the substrate 101, and the second pad 208 is installed on the side farther from the other of the first electrode 202 and the second electrode 203 on the substrate 101. The first pad 204 includes a first dimension portion 205 and a second dimension portion 207. The minimum distance in the second direction Y between the first dimension portion 205 and the first center line R1 is the sixth dimension C1, and the minimum distance in the second direction Y between the second dimension portion 207 and the first center line R1 is the seventh dimension C2. The maximum distance in the second direction Y between the first electrode 201 and the second center line R2 is the eighth dimension Y1, and Y1 = MAX(C1, C2).

[0172] As shown in FIGS. 5A to 5E, a sixth dimension C1 in the second direction Y between the first dimension portion 205 and the first center line R1, and a seventh dimension C2 in the second direction Y between the second dimension portion 207 and the first center line R1 satisfy Y = MAX(C1, C2), and the difference between the sixth dimension C1 and the seventh dimension C2 is substantially the same as the dimension of the first electrode 202 or the second electrode 203 in the second direction Y. For example, the boundary line 214 far from the second center line R2 of the first electrode 202 is substantially installed at an end close to the first center line R1 of the first dimension portion 205 of the first pad 204. Thereby, the first dimension portion 205 can provide a large installation area for the first electrode 202, and the first electrode 202 can be installed in the flat region 160 of the connection portion 105 as far as possible in a direction away from the second center line R2 in the second direction Y.

[0173] Therefore, the light-emitting substrate 01 according to the embodiment of the present disclosure is advantageous in preventing the light-emitting element 102 from tilting or shifting, and thereby the light-emitting substrate 01 can have good optical performance. Further, by having an appropriate separation distance between the pad and the surrounding reflective layer in the embodiment of the present disclosure, the risk of the "metal intrusion phenomenon" can be reduced.

[0174] Here, for the structural features of the light-emitting substrate 01, reference can be made to the relevant descriptions of the above embodiments, and details will not be described here.

[0175] As shown in FIGS. 5A to 5E, an embodiment of the present 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 installed on the substrate 101, and the reflective layer 100 includes an opening 103, and the maximum dimension of the opening 103 in the first direction X is H1.

[0176] As shown in FIGS. 5A to 5E, the orthographic projection of at least one pad 201 on the substrate 101 overlaps at least partially 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 intersecting the first direction X. The first pad 204 includes a first dimension portion 205 and a second dimension portion 207. The minimum distance between the first dimension portion 205 and the opening 103 is K2, and the maximum distance between the second dimension portion 207 and the opening 103 is H2, and H2 = H1 / 3 ± 0.2 μm, 50 μm ≦ H1 - 2K2 - (H1 - 2H2) / (1 ± 0.2) ≦ 100 μm is satisfied.

[0177] As shown in FIGS. 5A to 5E, for example, the orthographic projection of the light-emitting element 102 installed on the side far from the substrate 101 of the pad 201 on the substrate 101 may be an elongated shape. For example, the orthographic projection of the light-emitting element 102 on the substrate 101 is rectangular. For example, as shown in FIG. 5D, the light-emitting element 102 includes a first electrode 202 and a second electrode 203, and the maximum dimension of the first electrode 202 in the first direction X is K1. For example, regarding 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 deviation of the light-emitting element 102. Since the dimension of the first dimension portion 205 in the first direction X is larger than that of the second dimension portion 207, a large flat region 160 of the connection portion 105 installed between the pad 201 and the light-emitting element 102 can be widened, thereby reducing the risk of the inclination phenomenon of the light-emitting element 201.

[0178] For example, in the reflow process, welding between the light-emitting element 102 and the pad can be realized, and the orthographic projection area of the opening 103 of the reflective layer 100 on the substrate 101 can be made larger than the orthographic projection area of the pad 201 on the substrate 101. For example, the orthographic projection area of the pad 201 on the substrate 101 is completely surrounded by the orthographic projection area of the opening 103 of the reflective layer 100 on the substrate 101. The pad 201 can have a certain separation distance from the opening 103. For example, the pad 201 may have a certain distance from the opening 103 in its non-drawing direction. By setting H2 = H1 / 3 ± 0.2 μm and 50 μm ≦ H1 - 2K2 - (H1 - 2H2) / (1 ± 0.2) ≦ 100 μm, the pad 201 in the opening can be separated from the reflective layer 100, and within this distance range, the risk of the "metal intrusion phenomenon" can be reduced. At the same time, it can be prevented that the range of the opening of the opening 103 becomes too large, and the reflective layer 100 can have a sufficient covering area, so that the reflectivity of the light-emitting substrate 01 is improved, and thereby the light-emitting substrate 01 has good optical performance.

[0179] The embodiments of the present disclosure further provide a display device including any one of the above light-emitting modules.

[0180] FIG. 8 is a schematic diagram of a display device according to an embodiment of the present disclosure.

[0181] As shown in FIG. 8, the display device 1000 includes a light-emitting substrate 01, an optical layer 02, and a display panel 03, and the optical layer 02 is installed on the side far from the substrate 101 of the light-emitting element 102, and the display panel 03 is installed on the side far from the light-emitting substrate 01 of the optical layer 02.

[0182] For example, the optical layer 02 includes a diffusion layer 0202, a quantum dot film layer 0203, a diffusion layer 0204, and a composite film layer 0205 that are sequentially installed along the vertical direction far from the substrate 101. For example, the diffusion layer 0202 and the diffusion layer 0204 can improve the lamp image by the light-emitting substrate 01 and improve the display image quality of the display device 1000. The quantum dot film layer 0203 can convert blue light into white light by the excitation of the blue light emitted by the light-emitting substrate 01, and can improve the utilization rate of light energy for the light-emitting substrate 01. The composite film layer 0205 can improve the luminance of the light beam propagating through the composite film layer 0205. For example, the optical layer 02 may further include other film layers to improve the optical performance of the display device 1000.

[0183] For example, the light-emitting substrate 01 and the optical layer 02 can constitute at least a part of the light-emitting module 012 of the display device 1000. The display panel 03 is installed on one side of the light-emitting module 012 and is configured to protect each device in the display device 1000. For example, the display panel 03 can include a plurality of functional layers to better realize the display effect.

[0184] In the display device 1000 according to the above embodiment, the light-emitting elements in the light-emitting substrate 01 are less likely to cause circuit failures due to the "metal intrusion phenomenon" and can well protect the circuit. In addition, the probability of light path deviation of the light-emitting elements in the light-emitting substrate 01 is small, and the light-emitting substrate 01 has good optical performance. Therefore, the display performance of the display device 1000 can be improved.

[0185] For example, the above display device 1000 may include a liquid crystal display (abbreviated as LCD). For example, the display device 1000 can be implemented in various electronic devices or associated with various electronic devices. The various electronic devices include, but are not limited to, mobile phones, wireless devices, personal digital assistants (PDAs), handheld or portable computers, GPS receivers / navigators, cameras, MP4 video players, camcorders, game machines, wristwatches, table clocks, calculators, television monitors, flat panel displays, computer monitors, automotive displays (such as odometer displays), cockpit controls and / or displays, camera view displays (such as rear camera displays in vehicles), electrophotography, electronic billboards or signs, projectors, architectural structures, packaging, and aesthetic structures (such as displays of jewelry images), etc.

[0186] The following points need to be explained. (1) The drawings of the embodiments of the present disclosure only include the structures related to the embodiments of the present disclosure, and other structures can refer to the common design. (2) The features of the same and different embodiments of the present disclosure can be combined with each other without contradiction.

[0187] The above description is only an exemplary embodiment of the present disclosure and is not used to limit the protection scope of the present disclosure. The protection scope of the present disclosure is determined by the appended claims.

Explanation of Reference Numerals

[0188] 10 Light-emitting substrate 100 Reflective layer 101 Substrate 102, 140 Light-emitting elements 103 Opening 105 Connection part 110 Pad 202 First electrode 203 Second electrode

Claims

1. A light-emitting substrate, comprising: a substrate; a reflective layer disposed on the substrate and including an opening having a maximum dimension H1 in the first direction; at least one pad whose orthographic projection on the substrate at least partially overlaps with the orthographic projection of the opening on the substrate; a light-emitting element disposed on the substrate, whose orthographic projection on the substrate at least partially overlaps with the orthographic projection of the opening on the substrate, and including a first electrode and a second electrode; a connection portion disposed between the at least one pad and the light-emitting element, configured to connect the at least one pad and the light-emitting element, and including an edge arc region having a maximum dimension M in the first direction; the first electrode and the second electrode are spaced apart in a second direction intersecting the first direction, and the maximum dimension of the first electrode or the second electrode in the first direction is a first dimension K1; the at least one pad includes a first pad, the first pad includes a first dimension portion, the minimum distance between the first dimension portion and the opening in the first direction is a second dimension K2, and the second dimension K2 satisfies K2 ≤ 0.5H1 - 0.5(K1 + 2M) and 50 μm ≤ H1 - 2K2 - K1 ≤ 100 μm. A light-emitting substrate.

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

3. The at least one pad further includes a second pad, the first pad and the second pad are distributed at intervals, and are symmetric 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; the at least one pad is disposed on the side of the first electrode and the second electrode close 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, and 0.9Z ≤ D ≤ Z. The light-emitting substrate according to Claim 2.

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

5. In the second direction, the maximum distance between the edge of the first pad that is far from the second pad and the edge of the second pad that is far from the first pad is the same as the maximum dimension of the opening. The first dimension portion and the second dimension portion each include a first end and a second end that face 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. The light-emitting substrate according to any one of claims 3 to 4.

6. 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. The light-emitting substrate according to claim 5.

7. The orthographic projection of the first dimension portion on the substrate is a rectangle, 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, and the orthographic projection of the second end of the first dimension portion on the substrate overlaps the orthographic projection of the opening on the substrate. The orthographic projection of the second dimension portion on the substrate is a trapezoid, the second dimension portion includes an upper bottom portion and a lower bottom portion parallel to the first center line, and the distance in the first direction between the upper bottom portion and the opening is larger than the distance in the first direction between the lower bottom portion and the opening. The light-emitting substrate according to claim 6.

8. The orthographic projection of the first dimension portion on the substrate is 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 orthographic projection of the second dimension portion on the substrate is 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, the third dimension portion includes opposite 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, a positive projection of the second end of the third dimension portion on the substrate overlaps a positive projection of the opening on the substrate, and a dimension of the third dimension portion in the second direction is less than a dimension of the first dimension portion in the second direction. The light-emitting substrate according to any one of claims 6 to 7.

9. A dimension of the second dimension portion in the first direction gradually increases from a first end of the second dimension portion toward a second end of the second dimension portion, and a dimension of the second end of the second dimension portion in the first direction is the same as a dimension of the first end of the first dimension portion in the first direction. The light-emitting substrate according to claim 8.

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

11. A positive projection of the first dimension portion on the substrate is rectangular, a dimension of the first dimension portion in the first direction is larger than a dimension of the first dimension portion in the second direction, a positive projection of the second dimension portion on the substrate is rectangular, a dimension of the second dimension portion in the first direction is less than a dimension of the first dimension portion in the second direction, and the first dimension portion is connected to the second dimension portion. The light-emitting substrate according to claim 10.

12. The first pad further includes a third dimension portion, the third dimension portion includes opposite 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, and the second end of the third dimension portion is connected to the first end of the second dimension portion, a dimension of the third dimension portion in the first direction gradually decreases from the first end of the third dimension portion toward the second end of the third dimension portion, a dimension of the first end of the third dimension portion in the first direction is the same as a dimension of the second end of the first dimension portion in the first direction, and a dimension of the second end of the third dimension portion in the first direction is the same as a dimension of the first end of the second dimension portion in the first direction. The light-emitting substrate according to claim 11.

13. A positive projection of the third dimension portion on the substrate is trapezoidal. The light-emitting substrate according to claim 12.

14. In the first direction, the dimension of the second end of the first dimension portion is the same as the dimension 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 toward the second end of the second dimension portion. The first pad further includes a third dimension portion, the third dimension portion includes opposite first and second ends, and in the second direction, the second end of the third dimension portion abuts against 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 of the third dimension portion toward the second end of the third dimension portion. The light-emitting substrate according to claim 10.

15. The orthographic projection of the first dimension portion on the substrate is a trapezoid, and the orthographic projection of the third dimension portion on the substrate is a trapezoid. The light-emitting substrate according to claim 14.

16. The connecting side portion between the second 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. The light-emitting substrate according to claim 14.

17. 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 dimension portion and a fourth dimension portion. Both the third dimension portion and the fourth dimension portion include opposite first and second ends. 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, and 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 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 toward 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 the same as the dimension of the first end of the first dimension portion in the first direction. The light-emitting substrate according to claim 5.

18. The orthographic projections of the first dimension portion, the second dimension portion, the third dimension portion, and the fourth dimension portion on the substrate are all trapezoids. The light-emitting substrate according to claim 17.

19. In the first direction, the maximum dimension of the first dimension portion is the same as the maximum dimension of the opening. The first dimension portion and the second dimension portion each include a first end and a second end that face each other, and the first end of the first dimension portion and the first end of the second dimension portion are installed on the side closer to the first center line. The light-emitting substrate according to any one of claims 3 to 4, wherein the minimum distance in the second direction between the second end of the first dimension portion and the opening is substantially the same as the dimension of the first dimension portion in the second direction.

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

21. The light-emitting substrate according to any one of claims 19 to 20, wherein the orthographic projection of the first dimension portion on the substrate is rectangular, and the orthographic projection of the second dimension portion on the substrate is trapezoidal.

22. A light-emitting substrate, including a substrate, a reflective layer installed on the substrate and including an opening, 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, the at least one pad includes a first pad and a second pad, and the first pad and the second pad are symmetrically distributed with respect to a first center line located between the first pad and the second pad. a light-emitting element installed on the substrate, wherein the orthographic projection of the light-emitting element on the substrate at least partially overlaps the orthographic projection of the opening on the substrate, the light-emitting element includes a first electrode and a second electrode, and 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. including a connection portion installed between the at least one pad and the light-emitting element and configured to connect the pad and the light-emitting element. The first pad is installed on the side closer to the substrate of one of the first electrode and the second electrode, and the second pad is installed on the side farther from the substrate of the other of the first electrode and the second electrode. The minimum distance in the arrangement direction between the first electrode and the second electrode is the fourth dimension Z, the minimum distance in the arrangement direction between the first pad and the second pad is the fifth dimension D, and 0.9Z ≤ D ≤ Z, a light-emitting substrate.

23. A light-emitting substrate, comprising: a substrate; a reflective layer provided on the substrate and including an opening; at least one pad, a positive projection of the at least one pad on the substrate at least partially overlapping a positive 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 provided on the substrate, a positive projection of the light-emitting element on the substrate at least partially overlapping a positive 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; a connection portion provided between the at least one pad and the light-emitting element and configured to connect the pad and the light-emitting element; the first pad is provided on a side closer to the substrate of one of the first electrode and the second electrode, and the second pad is provided on a side farther from the substrate of the other of the first electrode and the second electrode; the first pad includes a first dimension portion and a second dimension portion, a minimum distance in the arrangement direction of the first pad and the second pad between the first dimension portion and the first center line is the sixth dimension C1, and a minimum distance in the arrangement direction of the first pad and the second pad between the second pad and the first center line is the seventh dimension C2; a maximum distance in the arrangement direction of the first electrode and the second electrode between the first electrode and the second center line is the eighth dimension Y, and Y = MAX(C1, C2), a light-emitting substrate.

24. A light-emitting substrate, comprising: a substrate; a reflective layer provided on the substrate and including an opening having a maximum dimension in the first direction of H1; At least one pad, wherein a front projection of the at least one pad on the substrate at least partially overlaps a front projection of the opening on the substrate, the at least one pad includes a first pad and a second pad, the first pad and the second pad are spaced apart in a second direction intersecting the first direction, and the first pad includes at least one pad including a first dimension portion and a second dimension portion, A minimum distance between the first dimension portion and the opening is K2, a maximum distance between the second dimension portion and the opening is H2, and H2 = H1 / 3 ± 0.2 μm, 50 μm ≦ H1 - 2K2 - (H1 - 2H2) / (1 ± 0.2) ≦ 100 μm is satisfied, a light-emitting substrate.

25. A display device including the light-emitting substrate according to any one of Claims 1 to 24.

Images