Light-emitting substrate and display device

Abstract

A light-emitting substrate (100) and a display device. The light-emitting substrate (100) comprises a light-emitting area (110) and a frame area (160). The light-emitting substrate (100) comprises a substrate (10), a plurality of light-emitting units (102) located on the substrate (10), and a plurality of signal lines (30). The light-emitting unit (102) is located in the light-emitting area (110), and comprises a driving circuit (103) and at least one light-emitting element (104). The plurality of light-emitting units (102) are arranged in M ​​rows along a first direction (D1) and in N columns along a second direction (D2) intersecting the first direction (D1). The plurality of signal lines (30) comprise N target signal lines (31) extending along the first direction (D1); the frame area (160) comprises an area of ​​the light-emitting substrate (100) located outside the first column of light-emitting units (101), an area located outside the Nth column of light-emitting units (101), and an area located outside the first row of light-emitting units. The target signal line (31) of the first column of light-emitting units (101) and / or the Nth column of light-emitting units (101) comprises a first extension section (311), a connection section (312) and a second extension section (313) connected in sequence, the first extension section (311) being connected to the driving circuit (103) and being located in the border area (160), the first extension section (311), the connection section (312) and the second extension section (313) forming a receiving area enclosing at least two groups of light-emitting units (102).

Description

Technical Field

[0001] The present application relates to the field of optical technology, and in particular to a light-emitting substrate and a display device. Background Art

[0002] Mini-LED is a new type of LED display technology derived from small-pitch LEDs, also known as sub-millimeter light-emitting diodes. Its grain size is approximately between 50μm and 300μm, which is between traditional LEDs and Micro LEDs. Due to its good display effect and thin experience, as well as its high contrast and long life, it has a clear trend of use in the display field. Summary of the invention

[0003] In a first aspect of an embodiment of the present application, a light-emitting substrate is provided. The light-emitting substrate comprises a light-emitting area and a frame area;

[0004] The light-emitting substrate comprises a substrate, and a plurality of light-emitting units and a plurality of signal lines located on the substrate; the light-emitting unit is located in the light-emitting area, and comprises a driving circuit and at least one light-emitting element connected to the driving circuit; the plurality of light-emitting units are arranged into M rows along a first direction and arranged into N columns along a second direction intersecting the first direction, and M and N are both positive integers greater than or equal to 1; the plurality of signal lines comprise N target signal lines extending along the first direction; the border area comprises an area of ​​the light-emitting substrate located outside the light-emitting units in the first column, an area located outside the light-emitting units in the Nth column, and an area located outside the light-emitting units in the first row;

[0005] The target signal line of the first column of light-emitting units and / or the target signal line of the Nth column of light-emitting units includes a first extension segment, a connecting segment and a second extension segment connected in sequence, the first extension segment is connected to the driving circuit and is located in the border area, the first extension segment, the connecting segment and the second extension segment enclose a containing area, and the containing area surrounds at least two groups of light-emitting units.

[0006] In one embodiment, the border area includes a first border area, a second border area and a third border area, the first border area and the second border area extend along the first direction and are arranged opposite to each other, and the third border area extends along the second direction; the first border area is an area where the light-emitting substrate is located outside the first column of light-emitting units, the second border area is an area where the light-emitting substrate is located outside the Nth column of light-emitting units, and the third border area is an area where the light-emitting substrate is located outside the first row of light-emitting units;

[0007] The first extension segment is located in the second frame area or the first frame area, the connecting segment is located in the third frame area, the second extension segment is located in the light emitting area, and the length of the first extension segment is smaller than the length of the second extension segment.

[0008] In one embodiment, the border area also includes a fourth border area arranged opposite to the third border area, and the fourth border area is an area of ​​the light-emitting substrate located outside the Mth row of light-emitting units; the fourth border area includes a binding area, and the second extension segment is connected to the binding area.

[0009] In one embodiment, the light-emitting area includes multiple sub-light-emitting areas arranged along the second direction, each sub-light-emitting area is provided with multiple columns of light-emitting units; the binding area includes multiple sub-binding areas, and the signal line of a sub-light-emitting area is connected to a sub-binding area.

[0010] In one embodiment, the sub-binding area is provided with a binding terminal for connecting to the corresponding sub-light-emitting area, and the binding terminal connected to the second extension segment is located between the binding terminals corresponding to two sub-light-emitting areas adjacent to the sub-light-emitting area where the second extension segment is located.

[0011] In one embodiment, the light-emitting area includes a plurality of sub-light-emitting areas arranged along the second direction, each sub-light-emitting area is provided with a plurality of columns of light-emitting units; a driving circuit of a column of light-emitting units is connected to one of the target signal lines;

[0012] In the sub-light-emitting area where the first column of light-emitting units is located, at least two target signal lines enclose a containing area surrounding at least two groups of light-emitting units; and / or, in the sub-light-emitting area where the Nth column of light-emitting units is located, at least two target signal lines enclose a containing area surrounding at least two groups of light-emitting units.

[0013] In one embodiment, the light-emitting area includes a plurality of sub-light-emitting areas arranged along the second direction, each sub-light-emitting area is provided with X columns of light-emitting units, X is an even number; in the same sub-light-emitting area, the second extension section is located between the X / 2th column of light-emitting units and the X / 2+1th column of light-emitting units.

[0014] In one embodiment, the light-emitting area includes a plurality of sub-light-emitting areas arranged along the second direction, each sub-light-emitting area is provided with X columns of light-emitting units, and X is a positive integer greater than or equal to 1;

[0015] The target signal lines of the light-emitting units in the first column and / or the target signal lines of the light-emitting units in the Xth column of each sub-light-emitting area are enclosed to form an accommodating area surrounding at least two groups of light-emitting units.

[0016] In one embodiment, the border area includes a fan-out area; among the plurality of signal lines, at least one of the signal lines includes a bending portion extending along the first direction, and the bending portion is located in the fan-out area;

[0017] An orthographic projection of a portion of the second extending section located in the fan-out region in the second direction does not overlap with an orthographic projection of the bending portion in the second direction.

[0018] In one embodiment, the target signal line is connected to a driving circuit of the first row of light emitting units.

[0019] In one embodiment, the driving circuit includes an address terminal and a relay terminal, the address terminal is configured to receive an address signal, and the relay terminal is configured to output a relay signal; the driving circuits in each column of light-emitting units are cascaded in sequence, the address terminal of the i-th driving circuit is located on the side of the i-th driving circuit close to the i-1-th driving circuit, and the relay terminal of the i-th driving circuit is located on the side of the i-th driving circuit close to the i+1-th driving circuit, 1<i<M and i is a positive integer; the first extension section is connected to the relay terminal of the driving circuit.

[0020] In one embodiment, the plurality of signal lines are arranged in the same layer.

[0021] In one embodiment, the light-emitting substrate further comprises a shielding ring, which is located in the frame area and surrounds the periphery of the light-emitting area;

[0022] The distance between the connecting section and the shielding ring in the first direction is greater than or equal to 0.2 mm.

[0023] In one embodiment, the light emitting substrate further comprises N driving voltage signal lines extending along the first direction, and a column of light emitting units is connected to one driving voltage signal line;

[0024] The spacing between the driving voltage signal line and other adjacent signal lines is greater than or equal to 0.2 mm.

[0025] In one embodiment, the target signal line is a feedback signal line; the second extension section is adjacent to a feedback signal line, and a distance between the second extension section and the adjacent feedback signal line in the second direction is greater than or equal to 0.05 mm.

[0026] In one embodiment, the light-emitting substrate further includes N common voltage signal lines extending along the first direction, and a driving circuit of a column of light-emitting units is connected to one common voltage signal line; the frame area includes a first frame area and a second frame area that are arranged opposite to each other, the first frame area is an area of ​​the light-emitting substrate located outside the first column of light-emitting units, and the second frame area is an area of ​​the light-emitting substrate located outside the Nth column of light-emitting units;

[0027] The common voltage signal line of the first column of light-emitting units or the Nth column of light-emitting units includes a first connecting portion located in the first border area or the second border area; the driving circuit includes multiple terminals, and the geometric center of the multiple terminals of the driving circuit of the light-emitting unit column where the first connecting portion is located is greater than or equal to 1.35 mm from the first connecting portion in the second direction.

[0028] In one embodiment, the distance between the geometric centers of the plurality of terminals of the driving circuit of the light emitting unit column where the first connecting portion is located and the first connecting portion in the second direction is smaller than the size of the light emitting unit in the second direction.

[0029] In one embodiment, the light-emitting substrate further includes N common voltage signal lines extending along the first direction, and a driving circuit of a column of light-emitting units is connected to one common voltage signal line; the border area includes a first border area and a second border area that are oppositely arranged, the first border area is an area of ​​the light-emitting substrate located outside the first column of light-emitting units, and the second border area is an area of ​​the light-emitting substrate located outside the Nth column of light-emitting units;

[0030] The common voltage signal line of the first column of light-emitting units or the Nth column of light-emitting units includes a first connecting portion located in the first border area or the second border area; a groove is provided on a side of the first connecting portion facing the light-emitting area.

[0031] In one embodiment, the light-emitting substrate further includes N driving voltage signal lines extending along the first direction, and a driving circuit of a column of light-emitting units is connected to one driving voltage signal line; the border area includes a first border area and a second border area that are arranged opposite to each other, the first border area is an area of ​​the light-emitting substrate located outside the first column of light-emitting units, and the second border area is an area of ​​the light-emitting substrate located outside the Nth column of light-emitting units;

[0032] The driving voltage signal line of the first column of light-emitting units or the Nth column of light-emitting units includes a second connecting portion located in the first border area or the second border area; a groove is provided on a side of the second connecting portion facing the light-emitting area.

[0033] In one embodiment, the target signal line is a feedback signal line, the plurality of signal lines further include a driving voltage signal line, a power signal line and a common voltage signal line; the driving circuit includes an address terminal, a relay terminal, a power terminal and a common voltage terminal;

[0034] The driving circuits in each column of light-emitting units are cascaded in sequence, the address terminal of the i-th driving circuit is located on the side of the i-th driving circuit close to the i-1-th driving circuit, the relay terminal of the i-th driving circuit is located on the side of the i-th driving circuit close to the i+1-th driving circuit, 1<i<M and i is a positive integer; the first extension section of the feedback signal line is connected to the relay terminal of the last driving circuit;

[0035] In the first direction, among the light emitting unit and the signal line connected to the light emitting unit, the driving voltage signal line, the light emitting element, the driving circuit, the power signal line and the common voltage signal line are arranged in sequence.

[0036] In one embodiment, the target signal line is a feedback signal line; the light-emitting area includes a plurality of sub-light-emitting areas, and the sub-light-emitting areas are provided with four columns of light-emitting units; in each of the sub-light-emitting areas, the feedback signal line of the fourth column of light-emitting units includes the first extension segment, the connecting segment and the second extension segment connected in sequence; in the same sub-light-emitting area, the second extension segment is located on one side of the feedback signal line of the second column of light-emitting units.

[0037] In one embodiment, the border area includes a fourth border area extending along the second direction, and the fourth border area is an area of ​​the light-emitting substrate located outside the Mth row of light-emitting units; the fourth border area includes a plurality of sub-binding areas; the light-emitting area includes a plurality of sub-light-emitting areas, and the sub-light-emitting areas are provided with a plurality of columns of light-emitting units; a signal line of one of the sub-light-emitting areas is connected to a binding terminal of the same sub-binding area, and the binding terminal of the same sub-binding area is connected to a flexible circuit board.

[0038] A second aspect of the embodiments of the present application provides a display device, which includes the light-emitting substrate according to the above.

[0039] In the light-emitting substrate and the display device provided by the embodiments of the present application, the target signal line of the first column of light-emitting units and / or the target signal line of the Nth column of light-emitting units include a first extension segment, a connecting segment and a second extension segment connected in sequence. Since the first extension segment, the connecting segment and the second extension segment enclose a containing area that surrounds at least two groups of light-emitting units, the second extension segment is at least partially located in the light-emitting area. Compared with a solution in which the second extension segment is arranged in an area outside the first column of light-emitting units in the border area or in which the second extension segment is arranged in an area outside the first column of light-emitting units in the border area, the width of the border area can be reduced, which helps to increase the proportion of the light-emitting area of ​​the light-emitting substrate, thereby improving the user experience. BRIEF DESCRIPTION OF THE DRAWINGS

[0040] Figure 1 is a schematic diagram of the arrangement of a light-emitting substrate provided by an exemplary embodiment of the present application;

[0041] Figure 2 is a local wiring diagram of a light-emitting substrate provided by an exemplary embodiment of the present application;

[0042] Figure 3 is a local wiring diagram of a light-emitting substrate provided by an exemplary embodiment of the present application;

[0043] Figure 4 It is a schematic diagram of local wiring of a light-emitting substrate provided by an exemplary embodiment of the present application. DETAILED DESCRIPTION

[0044] Exemplary embodiments will be described in detail herein, examples of which are shown in the accompanying drawings. When the following description refers to the drawings, unless otherwise indicated, the same numbers in different drawings represent the same or similar elements. The embodiments described in the following exemplary embodiments do not represent all embodiments consistent with the present application. Instead, they are merely examples of devices and methods consistent with some aspects of the present application as detailed in the appended claims.

[0045] The terms used in this application are for the purpose of describing specific embodiments only and are not intended to limit this application. The singular forms of "a", "said" and "the" used in this application and the appended claims are also intended to include plural forms unless the context clearly indicates other meanings. It should also be understood that the term "and / or" used herein refers to and includes any or all possible combinations of one or more associated listed items.

[0046] It should be understood that although the terms first, second, third, etc. may be used in the present application to describe various information, these information should not be limited to these terms. These terms are only used to distinguish the same type of information from each other. For example, without departing from the scope of the present application, the first information may also be referred to as the second information, and similarly, the second information may also be referred to as the first information. Depending on the context, the word "if" as used herein may be interpreted as "at the time of" or "when" or "in response to determining".

[0047] The embodiments of the present application provide a light-emitting substrate and a display device. The light-emitting substrate and the display device in the embodiments of the present application are described in detail below in conjunction with the accompanying drawings. In the absence of conflict, the features in the following embodiments can complement or combine with each other.

[0048] The embodiment of the present application provides a light-emitting substrate, Figure 1 FIG. 1 shows a schematic diagram of the arrangement of the light emitting substrate 100. Figure 1 As shown, the light emitting substrate 100 includes a light emitting area 110 and a frame area 160 .

[0049] The light-emitting substrate 100 includes a substrate 10, and a plurality of light-emitting units 102 and a plurality of signal lines 30 located on the substrate 10. The light-emitting unit 102 is located in the light-emitting area 110, and includes a driving circuit 103 and at least one light-emitting element 104 connected to the driving circuit 103. The plurality of light-emitting units 102 are arranged in M ​​rows along a first direction D1 and in N columns along a second direction D2 intersecting the first direction D1, where M and N are both positive integers greater than or equal to 1. The first direction D1 may be a column direction in the figure, and the second direction D2 may be a row direction in the figure, and the first direction D1 and the second direction D2 may be perpendicular to each other. The plurality of signal lines include N target signal lines extending along the first direction D1. The border area includes an area of ​​the light-emitting substrate 100 located outside the first column of light-emitting units, an area located outside the Nth column of light-emitting units, and an area located outside the first row of light-emitting units.

[0050] The target signal line 31 of the first column of light-emitting units 101 and / or the target signal line 31 of the Nth column of light-emitting units 101 include a first extension section 311, a connection section 312, and a second extension section 313 connected in sequence, the first extension section 311 is connected to the driving circuit 103 and is located in the border area 160, the first extension section 311, the connection section 312, and the second extension section 313 enclose a containing area, and the containing area surrounds at least two groups of light-emitting units 102. The containing area surrounds at least two groups of light-emitting units 102, which may be at least two light-emitting units 102 arranged in the first direction D1 surrounded by the containing area, or at least two light-emitting units 102 arranged in the second direction D2 surrounded by the containing area, or the light-emitting units surrounded by the containing area are located in at least two columns, and at least two light-emitting units are located in the same column.

[0051] Figure 1 In the illustrated embodiment, the target signal lines 31 of the light emitting units 101 in the Nth column form an accommodation area, and the target signal lines 31 of the light emitting units 101 in the first column do not form an accommodation area. In other embodiments, the target signal lines 31 of the light emitting units 101 in the first column may form an accommodation area, and the target signal lines 31 of the light emitting units 101 in the Nth column may not form an accommodation area, or the target signal lines 31 of the light emitting units 101 in the first column and the target signal lines 31 of the light emitting units 101 in the Nth column may both form an accommodation area.

[0052] In the light-emitting substrate 100 provided in the embodiment of the present application, the target signal line 31 of the first column of light-emitting units 101 and / or the target signal line 31 of the Nth column of light-emitting units 101 include a first extension section 311, a connecting section 312 and a second extension section 313 connected in sequence. Since the first extension section 311, the connecting section 312 and the second extension section 313 enclose a accommodating area that surrounds at least two groups of light-emitting units, the second extension section is at least partially located in the light-emitting area. Compared with the solution of setting the second extension section 313 in the area where the border area is located outside the first column of light-emitting units 101 or setting the second extension section in the area where the border area is located outside the first column of light-emitting units 101, the width of the border area can be reduced, which helps to increase the proportion of the light-emitting area of ​​the light-emitting substrate, thereby improving the user experience.

[0053] In one embodiment, the driving circuit 103 of a column of light emitting units 101 is connected to one target signal line 31 . A column of light emitting units 101 corresponds to one target signal line 31 , and each driving circuit 103 of the column of light emitting units 101 is connected to the corresponding target signal line 31 .

[0054] In one embodiment, Figure 1As shown, the frame area 160 includes a first frame area 120, a second frame area 130, a third frame area 140 and a fourth frame area 150. The first frame area 120 and the second frame area 130 extend along the first direction D1 and are arranged opposite to each other; the third frame area 140 and the fourth frame area 150 extend along the second direction D2 and are arranged opposite to each other. The first frame area 120 is the area where the light-emitting substrate 100 is located outside the first column of light-emitting units 101, the second frame area 130 is the area where the light-emitting substrate 100 is located outside the Nth column of light-emitting units 101, the third frame area 140 is the area where the light-emitting substrate 100 is located outside the first row of light-emitting units, and the fourth frame area 150 is the area where the light-emitting substrate 100 is located outside the Mth row of light-emitting units. In some embodiments, the first frame area 120 is the left frame of the display substrate, the second frame area 130 is the right frame of the display substrate, the third frame area 140 is the upper frame of the display substrate, and the fourth frame area 150 is the lower frame of the display substrate. Among them, the upper side, lower side, left side and right side are determined by the orientation of the frame of the light-emitting substrate when the user uses the light-emitting substrate. For example, the side of the light-emitting substrate used for binding the circuit board is the lower side of the light-emitting substrate, and the upper side is the opposite side of the lower side.

[0055] In one embodiment, the first extension segment 311 is located in the second frame area 130 or the first frame area 120, the connecting segment 312 is located in the third frame area 140, the second extension segment 313 is located in the light-emitting area 110, and the length of the first extension segment 311 is less than the length of the second extension segment 313. In addition, the length of the first extension segment 311 is much less than the length of the second extension segment 313, for example, the length of the first extension segment 311 may be less than 1 / M of the length of the second extension segment 313. In some embodiments, M=30, then the length of the first extension segment 311 may be less than 1 / 30 of the length of the second extension segment 313. The connecting segment 312 may include a first portion extending along the second direction D2 and a second portion extending along the first direction D1, and the second portion of the connecting segment 312 connects the first extension segment 311 and the second extension segment 313 to the first portion of the connecting segment 312.

[0056] In one embodiment, Figure 2 As shown, the fourth frame area 150 includes a fan-out area 151 and a binding area 152. The fan-out area 151 may be located between the binding area 152 and the light-emitting area 110. The second extension section 313 is connected to the binding area 152. The second extension section 313 is connected to the binding area 152 through the fan-out area 151.

[0057] In one embodiment, the light-emitting area 110 includes a plurality of sub-light-emitting areas 109 arranged along the second direction D2, and each sub-light-emitting area 109 is provided with a plurality of columns of light-emitting units; the binding area 152 includes a plurality of sub-binding areas 1521, and the signal line 30 of a sub-light-emitting area 109 is connected to a sub-binding area 1521.

[0058] In one embodiment, the sub-binding area 1521 is provided with a binding terminal for connecting to the corresponding sub-light-emitting area 109, and the second extension section 313 is connected to the binding terminal of the binding area 152 through the fan-out area 151. The binding terminal of the binding area 152 can be bound with a circuit board, and the circuit board provides an electrical signal for the signal line 30 connected to the binding terminal.

[0059] In one embodiment, the signal line 30 of one of the sub-light-emitting areas 109 is connected to the binding terminal of the same sub-binding area 1521. The binding terminal of the same sub-binding area 1521 is connected to a flexible circuit board. The flexible circuit board provides corresponding electrical signals for the signal line.

[0060] In some embodiments, Figure 2 As shown, the width of the sub-light-emitting area 109 in the second direction D2 is greater than the width of the corresponding sub-binding area 1521 in the second direction D2. The distance between the end of the sub-light-emitting area 109 close to the first frame area and the end of the corresponding sub-binding area 1521 close to the first frame area is substantially the same as the distance between the end of the sub-light-emitting area 109 close to the second frame area and the end of the corresponding sub-binding area 1521 close to the second frame area.

[0061] When at least part of the signal lines of the sub-light-emitting area 109 are connected to the sub-binding area 1521 through the fan-out area 151, the signal lines will bend in the fan-out area because the distance between the part of the signal lines located in the light-emitting area and the corresponding sub-binding area in the second direction D2 is relatively large. In particular, the signal lines of a column of light-emitting units 101 close to the first border area 120 in the sub-light-emitting area 109 and the signal lines of a column of light-emitting units 101 close to the second border area 130 are relatively far from the corresponding binding terminals in the first direction D1, and these signal lines 30 are more likely to bend when passing through the fan-out area 151.

[0062] In one embodiment, Figure 2 As shown, among the plurality of signal lines 30 of the light emitting substrate 100, at least one signal line 30 includes a bending portion 32 extending along the first direction D1. The bending portion 32 extending along the first direction D1 means that the bending portion 32 extends along the first direction D1 as a whole.

[0063] When the projections of the multiple bending portions 32 in the fan-out area 151 in the second direction overlap, the width of the fan-out area 151 in the second direction D2 will be larger. When the width of the fourth frame area 150 is constant, the width of the bending portion 32 needs to be set smaller, so that the resistance of the bending portion 32 is larger, and the temperature rise of the fan-out area 151 is larger during the operation of the light-emitting substrate. The projection of the bending portion 32 in the second direction D2 refers to the projection of the bending portion 32 on the straight line extending along the second direction D2.

[0064] In the embodiment of the present application, by setting the target signal line 31 of the first column of light-emitting units 101 and / or the target signal line 31 of the Nth column of light-emitting units 101 to include a first extension section 311, a connection section 312 and a second extension section 313 connected in sequence, the distance between the portion of the second extension section 313 located in the light-emitting area and the corresponding sub-binding area in the first direction D1 can be reduced, and the second extension section 313 may not bend when passing through the fan-out area, or the bent portion may have a smaller size in the second direction D2, which helps to avoid the portion of the second extension section 313 located in the fan-out area from overlapping with the projections of the bent portions of other signal lines in the second direction; under the premise that the width of the fourth border area is constant, the width of the bent portions of other signal lines can be set to be larger to reduce the temperature rise of the fan-out area 151 during the operation of the light-emitting substrate; under the premise that the width of the bent portions of each signal line and the distance between adjacent bent portions are constant, it helps to reduce the width of the fourth border area.

[0065] In one embodiment, the binding terminal connected to the second extension section 313 is located between the binding terminals corresponding to two sub-light-emitting areas 109 adjacent to the sub-light-emitting area 109 where the second extension section 313 is located. The binding terminal corresponding to the sub-light-emitting area 109 refers to the binding terminal connected to the signal line of the sub-light-emitting area 109; the two sub-light-emitting areas adjacent to the sub-light-emitting area 109 refer to the two sub-light-emitting areas located on both sides of the sub-light-emitting area 109. In this way, the distance between the portion of the extension section 313 located in the light-emitting area and the corresponding binding terminal in the second direction D2 is small, which helps the portion of the side extension section 313 located in the fan-out area to bend. Under the premise that the width of the fourth frame area is constant, the temperature rise of the fan-out area during the operation of the light-emitting substrate can be further reduced; under the premise that the width of the bending portion of each signal line and the distance between adjacent bending portions are constant, the width of the fourth frame area can be further reduced.

[0066] In one embodiment, in the sub-light-emitting area 109 where the first column of light-emitting units 101 is located, at least two target signal lines 31 enclose a containing area surrounding at least two groups of light-emitting units 102. Such an arrangement, under the premise that the width of the fourth border area is constant, is more conducive to increasing the width of the bending portion of the signal line in the fan-out area, and further reducing the temperature rise of the fan-out area during the operation of the light-emitting substrate; under the premise that the width of the bending portion of each signal line and the distance between adjacent bending portions are constant, the width of the fourth border area can be more effectively reduced.

[0067] In one embodiment, in the sub-light-emitting area 109 where the Nth column of light-emitting units 101 is located, at least two target signal lines 31 enclose to form a containing area surrounding at least two groups of light-emitting units. Such a configuration is more helpful to reduce the width of the fourth border area 150. Such a configuration is more helpful to increase the width of the bending portion of the signal line in the fan-out area under the premise that the width of the fourth border area is constant, and further reduce the temperature rise of the fan-out area during the operation of the light-emitting substrate; under the premise that the width of the bending portion of each signal line and the distance between adjacent bending portions are constant, the width of the fourth border area can be more effectively reduced.

[0068] In one embodiment, see again Figure 2 , the light-emitting area 110 includes a plurality of sub-light-emitting areas 109 arranged along the second direction D2, each sub-light-emitting area 109 is provided with X columns of light-emitting units, X is an even number. In the same sub-light-emitting area 109, the second extension section 313 is located between the light-emitting units in the X / 2th column and the light-emitting units in the X / 2+1th column. In this arrangement, the second extension section 313 of each sub-light-emitting area 109 is closer to the center of the corresponding sub-binding area, so each second extension section 313 can be connected to the binding terminal of the corresponding sub-binding area without bending when passing through the fan-out area 151, or each second extension section 313 is bent in the fan-out area 151, but the size of the bent part in the first direction D1 is very small, which helps to avoid the overlap of the projection of the second extension section 313 in the second direction D2 with the projection of the bending portion 32 of other signal lines in the second direction D2, and helps to reduce the width of the fourth frame area 150 or reduce the temperature rise of the fan-out area during the operation of the light-emitting substrate.

[0069] In an exemplary embodiment, Figure 2 As shown, X=4, that is, the light-emitting area 110 includes a plurality of sub-light-emitting areas 109, and the sub-light-emitting areas 109 are provided with four columns of light-emitting units; in each of the sub-light-emitting areas 109, the second extension section 313 of the fourth column of light-emitting units is located between the second column of light-emitting units and the third column of light-emitting units. Figure 2 and Figure 3 As shown, two rows of light emitting units are disposed between the second extension section 313 and the first extension section 311 .

[0070] In another embodiment, X is an odd number. In the same sub-light-emitting area 109, the second extension section 313 is located between the light-emitting units in the (X+1) / 2th column and the light-emitting units in the (X+1) / 2+1th column. This arrangement also helps to reduce the width of the fourth border area 150 or the temperature rise of the fan-out area during the operation of the light-emitting substrate.

[0071] In one embodiment, each sub-light-emitting area is provided with X columns of light-emitting units, where X is a positive integer greater than or equal to 1; the target signal lines of the first column of light-emitting units and / or the target signal lines of the Xth column of light-emitting units in each of the sub-light-emitting areas are enclosed to form a containing area surrounding at least two groups of light-emitting units. In this way, in each sub-light-emitting area, the distance between the portion of the second extension section of the first column of light-emitting units located in the light-emitting area and the portion of the second extension section of the Xth column of light-emitting units located in the light-emitting area and the corresponding binding terminals in the second direction is relatively small, which is more helpful to reduce the width of the fourth border area 150 or reduce the temperature rise of the fan-out area during the operation of the light-emitting substrate.

[0072] Further, when X is an even number, in each of the sub-light-emitting areas 109, the target signal line 31 of the first column of light-emitting units 101 and the target signal line 31 of the Xth column of light-emitting units are both enclosed to form an accommodating area surrounding at least two groups of light-emitting units, and the second extension section of the first column of light-emitting units 101 and the second extension section of the target signal line 31 of the Xth column of light-emitting units are both located between the X / 2th column of light-emitting units and the X / 2+1th column of light-emitting units.

[0073] In one embodiment, Figure 2 As shown, the orthographic projection of the portion of the second extension section 313 located in the fan-out area 151 in the second direction D2 does not overlap with the orthographic projection of the bending portion 32 in the second direction D2. This arrangement can effectively reduce the width of the fourth border area 150 or effectively reduce the temperature rise of the fan-out area during the operation of the light-emitting substrate.

[0074] In one embodiment, the target signal line 31 is connected to the driving circuit of the first row of light emitting units. The distance between the driving circuit of the first row of light emitting units and the third border area 140 in the first direction D1 is small, so the length of the first extension section 311 is small.

[0075] In one embodiment, the driving circuit 103 may be an integrated circuit, and in particular, may be a packaged chip with multiple terminals. The driving circuit 103 may include one output terminal, or may include at least two output terminals, such as two output terminals, three output terminals, four output terminals, or more output terminals.

[0076] In one embodiment, Figure 4As shown, each driving circuit 103 includes a plurality of terminals arranged in an array along a first direction D1 and a second direction D2, and the plurality of terminals are arranged in at least two columns along the second direction D2. The plurality of terminals include at least one output terminal Out and at least one common voltage terminal GND, and the at least one output terminal Out and the at least one common voltage terminal GND are located in different columns of the plurality of terminals. In each column of light-emitting units 101, at least one output terminal Out of each driving circuit 103 is connected to a light-emitting element 104 connected to the driving circuit 103 in a one-to-one correspondence, so as to transmit a driving signal to at least one light-emitting element 104.

[0077] The driving circuit 103 further includes an address terminal Di, a relay terminal Out, and a power terminal Pwr. The driving circuits 103 in each column of the light-emitting units 101 are sequentially cascaded, the address terminal Di of the i-th driving circuit 103 is located on the side of the i-th driving circuit 103 close to the i-1-th driving circuit 103, the relay terminal Out of the i-th driving circuit 103 is located on the side of the i-th driving circuit 103 close to the i+1-th driving circuit 103, 1<i<M and i is a positive integer. In the same column of light-emitting units, two adjacent driving circuits 103 are sequentially cascaded through a cascade wiring 111 extending along the first direction D1.

[0078] In the embodiment provided in the present application, the driving circuits 103 in each column of the light-emitting units 101 are sequentially cascaded from bottom to top along the first direction D1, and the i-th level driving circuit 103 refers to the i-th driving circuit 103 counting upward from the driving circuit 103 in the M-th row in each column of the light-emitting units 101. For example, taking the first column of the light-emitting units 101 as an example, the driving circuit 103 located in the M-th row of the first column is the first-level driving circuit, and the driving circuit 103 located in the M-1th row of the first column is the second-level driving circuit, and so on, the driving circuit 103 located in the second row of the first column is the M-1th level driving circuit, and the driving circuit 103 located in the first row of the first column is the M-1th level driving circuit.

[0079] In such Figure 4 In the driving circuit 103 shown, the driving circuit 103 includes an output terminal Out, a common voltage terminal GND, an address terminal Di and a power terminal Pwr. In the driving circuit 103, the output terminal Out is reused as a relay terminal, that is, the output terminal Out and the relay terminal are the same terminal, and the output terminal Out outputs different signals in different time periods, for example, as a relay terminal to output a relay signal and as an output terminal to output a driving signal.

[0080] In one embodiment, Figure 4As shown, multiple terminals of the driving circuit 103 are arranged into a first column and a second column along the second direction D2. In each column of light-emitting units 101, the first column of terminals of the driving circuit 103 is located on the side of the driving circuit 103 close to the first border area 120 (i.e., located on the left side of the driving circuit 103), and the second column of terminals of the driving circuit 103 is located on the side of the driving circuit 103 away from the first border area 120 (i.e., located on the right side of the driving circuit 103). This arrangement of the terminals of the driving circuit 103 is conducive to promoting the regular arrangement of various signal lines, so that the various signal lines do not overlap with each other, thereby avoiding short circuit / open circuit or signal crosstalk caused by overlapping between various signal lines. Figure 4 In the embodiment shown, the output terminal Out and the address terminal Di are located in the first column, and the power terminal Pwr and the common voltage terminal GND of the driving circuit 103 are located in the second column. In other embodiments, the number and arrangement of the terminals of the driving circuit 103 may be different from this.

[0081] In one embodiment, Figure 2 and Figure 3 As shown, the light emitting substrate further includes a plurality of first pads 23, the driving circuit 103 is mounted on the first pads 23 and is electrically connected to the first pads 23, and the first pads correspond to the driving circuits one by one. Figure 2 and Figure 3 In the illustrated embodiment, the first pad is provided with four sub-pads at positions corresponding to the four terminals of the driving circuit 103, which are respectively a first sub-pad for mounting the address terminal Di, a second sub-pad for mounting the power terminal Pwr, a third sub-pad for mounting the common voltage terminal GND, and a fourth sub-pad for mounting the output terminal Out. The first sub-pad is connected to the address terminal Di of the driving circuit 103, the second sub-pad is connected to the power terminal Pwr of the driving circuit 103, the third sub-pad is connected to the common voltage terminal GND of the driving circuit 103, and the fourth sub-pad is connected to the output terminal Out of the driving circuit 103. One end of the fourth sub-pad is connected to the cascade trace 111 to output a relay signal in a period as an address signal of the next stage driving circuit 103 cascaded with the driving circuit 103; the other end of the fourth sub-pad is connected to the light-emitting element 104 to be transmitted to the light-emitting element 104 connected to the driving circuit 103 via the electrical signal in another period.

[0082] In one embodiment, Figure 2 and Figure 3As shown, the light-emitting substrate further includes a plurality of second pads 21, and the second pads correspond to the light-emitting elements 104 one by one. The light-emitting elements 104 are mounted on the corresponding second pads 21 and are electrically connected to the corresponding second pads. The second pads include two fifth sub-pads, and the light-emitting unit includes two terminals, one of which is electrically connected to one fifth sub-pad. When the light-emitting unit 102 includes a plurality of light-emitting elements 104, the second pads 21 of the plurality of light-emitting elements 104 are sequentially connected in series through the wires 22.

[0083] In one embodiment, Figures 1 to 4 As shown, the plurality of signal lines include N driving voltage signal lines VLEDL extending along the first direction D1, and a column of light-emitting units is connected to a driving voltage signal line VLEDL. Specifically, one end of each light-emitting element 104 in a column of light-emitting units is connected to the driving voltage signal line VLEDL. When the light-emitting unit includes a plurality of light-emitting elements, the plurality of elements are connected in series through a wire 22, and one end of the light-emitting element at one end of the plurality of light-emitting elements after the series connection is connected to the driving voltage signal line VLEDL through a second pad 21, and one end of the light-emitting element at the other end is connected to the output terminal Out of the driving circuit through the second pad 21. The driving voltage signal line VLEDL is configured to provide a driving voltage to the light-emitting element 104. In each column of light-emitting units 101, the output terminal Out of each driving circuit 103 is connected to the second end of at least one light-emitting element 104 connected to the driving circuit 103, so as to transmit the driving signal to the at least one light-emitting element 104.

[0084] In one embodiment, Figures 1 to 4 As shown, the plurality of signal lines further include N common voltage signal lines GNDL extending along the first direction D1, and a column of light-emitting units is connected to a common voltage signal line GNDL. Specifically, each driving circuit 103 in a column of light-emitting units is connected to the common voltage signal line GNDL. The third sub-pad is connected to the common voltage signal line GNDL to transmit the common voltage signal on the common voltage signal line GNDL to the common voltage terminal GND. The common voltage signal line GNDL is configured to provide a common voltage (e.g., a ground voltage) to the driving circuit 103. For example, when it is necessary to make the light-emitting element 104 in a certain light-emitting unit 102 emit light, by making the driving voltage a high voltage and the common voltage a low voltage, a voltage difference is generated on both sides of the light-emitting element 104, thereby driving the light-emitting element 104 to emit light.

[0085] When the light-emitting unit 102 includes a plurality of light-emitting elements 104 connected in series, the fifth sub-pad corresponding to one of the light-emitting elements 104 is connected to the output terminal Out of the driving circuit 103. The common voltage terminal GND of each driving circuit 103 is connected to the common voltage signal line GNDL to receive the common voltage (e.g., ground voltage) transmitted by the common voltage signal line GNDL.

[0086] In one embodiment, Figures 1 to 4 As shown, the plurality of signal lines further include N addressing signal lines ADDRL extending along the first direction D1, and one column of light-emitting units is connected to one addressing signal line ADDRL. The addressing signal line ADDRL is connected to the address terminal Di of the first-stage driving circuit 103 through the first sub-pad, and the relay terminal Out of the previous-stage driving circuit is connected to the address terminal Di of the next-stage driving circuit 103 via the cascade wiring. The addressing signal line ADDRL is configured to transmit an address signal to the address terminal Di of the first-stage driving circuit 103 in each column of light-emitting units. After receiving the address signal, the first-stage driving circuit 103 can parse and obtain and store the address information in the address signal as the address information of the first-stage driving circuit 103, and can also increment the address information by 1 or another fixed amount and modulate the incremented address information (new address information) into a relay signal. The relay terminal Out of the first-stage driving circuit 103 transmits the relay signal to the address terminal Di of the second-stage driving circuit 103 via the cascade wiring as the address information of the second-stage driving circuit 103. Of course, the first-level driving circuit 103 can also use any other appropriate function to transform its address information to generate a relay signal. The second-level driving circuit 103 transmits the relay signal to the third-level driving circuit 103 in a similar manner as the address information of the third-level driving circuit 103, and so on. In this way, corresponding address information can be configured for each of the multiple cascaded driving circuits 103 in each column of light-emitting units. In this way, for a column of light-emitting units, only one address signal needs to be provided through an address selection signal line ADDRL, so that all driving circuits 103 in the column of light-emitting units can obtain their respective address information. This greatly reduces the number of signal lines, saves wiring space, and simplifies the control method.

[0087] In one embodiment, Figures 1 to 4 As shown in FIG. 1 , the plurality of signal lines further include N power signal lines PwrL extending along the first direction D1, and one column of light-emitting units is connected to one power signal line PwrL. Specifically, one power signal line PwrL is connected to the power terminals Pwr of all driving circuits 103 in the corresponding column of light-emitting units. The second sub-pad is connected to the power signal line PwrL to transmit the power voltage signal on the power signal line PwrL to the power terminal Pwr. Figure 4 As shown, each power signal line PwrL includes a main portion and a third connection portion 118 . The main portion of the power signal line PwrL extends along the first direction D1 . The power signal line PwrL is electrically connected to the driving circuit 103 through the third connection portion 118 .

[0088] The power signal line PwrL is configured to transmit a power voltage signal to the power terminal Pwr of each drive circuit 103, thereby providing a power voltage signal for each drive circuit 103. In an exemplary embodiment, the power voltage signal is a power line carrier communication signal. In this case, the power signal line PwrL can not only provide a power voltage signal to each drive circuit 103, but also provide communication data to each drive circuit 103, and the communication data can be used to control the light-emitting duration of at least one light-emitting element 104 connected to the drive circuit 103, thereby controlling its visual light-emitting brightness. The power line carrier communication signal contains information corresponding to the communication data. For example, the communication data is data reflecting the light-emitting duration, thereby representing the required light-emitting brightness. Compared to the conventional serial peripheral interface (Serial Peripheral Interface, SPI) protocol, the embodiment of the present application uses a power line carrier communication (Power Line Carrier Communication, PLC) protocol to superimpose the communication data on the power signal line PwrL, thereby effectively reducing the number of signal lines.

[0089] In one embodiment, Figures 1 to 4 As shown, the plurality of signal lines further include N feedback signal lines FBL extending along the first direction D1, and one column of light emitting units is connected to one feedback signal line FBL. Specifically, one feedback signal line FBL is connected to the relay terminals Out of all the driving circuits 103 in the corresponding column of light emitting units. In each column of light emitting units 101, the feedback signal line FBL is connected to the relay terminal Out of the last stage of the driving circuit 103.

[0090] It should be noted that, in the embodiments of the present application, the signal line generally includes a main body portion and a connecting portion, the main body portion defines the main extension direction of the signal line, and the connecting portion is used to connect the signal line to the light-emitting unit. In the embodiments of the present application, a description such as "X signal line extending along the first direction D1" only defines that the main body portion of the X signal line extends along the first direction D1, but does not define that the connecting portion of the X signal line extends along the first direction D1. For example, the main body portion of each power signal line PwrL extends along the first direction D1, and its third connecting portion 118 does not extend along the first direction D1, but extends along a direction intersecting the first direction D1 (for example, the second direction D2).

[0091] In one embodiment, Figures 1 to 3As shown, the light-emitting substrate 100 further includes a shielding ring Guard, wherein the shielding ring Guard is located in the frame area 160 and surrounds the periphery of the light-emitting area 110. The electrical signal received by the shielding ring Guard may be the same as the electrical signal received by the common voltage signal line GNDL. For example, the shielding ring Guard and the common voltage signal line GNDL are both connected to the binding electrode of the binding area, and the binding terminal connected to the shielding ring Guard and the binding terminal connected to the common voltage signal line GNDL have the same electrical signal, so that the electrical signal received by the shielding ring Guard is the same as the electrical signal received by the common voltage signal line GNDL.

[0092] In one embodiment, the distance between the connecting segment 312 and the shielding ring Guard in the first direction D1 is greater than or equal to 0.2 mm. The distance between the connecting segment 312 and the shielding ring Guard in the first direction D1 refers to the distance between the portion of the connecting segment 312 extending along the second direction and the shielding ring Guard in the first direction D1. This arrangement helps to avoid signal interference between the target signal line 31 and the shielding ring Guard.

[0093] In one embodiment, the target signal line 31 is a feedback signal line FBL; the first extension section 311 of the feedback signal line FBL is connected to the relay terminal Out of the last stage driving circuit 103 .

[0094] Furthermore, if Figure 1 and Figure 2 As shown, in the first direction D1, among the light emitting units 102 and the signal lines connected to the light emitting units 102, the driving voltage signal line VLEDL, the light emitting element 104, the driving circuit 103, the power signal line PwrL and the common voltage signal line GNDL are arranged in sequence. The first extension section 311 of the feedback signal line FBL is located between the driving voltage signal line VLEDL and the power signal line PwrL of the light emitting unit in the column where it is located.

[0095] Furthermore, the second extension section 313 of the feedback signal line FBL is adjacent to a feedback signal line FBL, and the distance between the second extension section 313 and the adjacent feedback signal line FBL in the second direction D2 is greater than or equal to 0.05 mm. The second extension section 313 may be located between the feedback signal line FBL of one column of light-emitting units and the driving voltage signal line VLEDL of the next column of light-emitting units. Figure 4 As shown, the feedback signal line FBL of the Nth column of light emitting units N The second extension section 313 is located at the feedback signal line FBL of the light emitting unit in the N-2th column. N-2 The driving voltage signal line VLEDL of the N-1th column of light emitting units N-1By setting the distance between the second extension section 313 and the adjacent feedback signal line FBL in the second direction D2 to be greater than or equal to 0.05 mm, signal crosstalk between the second extension section 313 and the adjacent feedback signal line FBL can be avoided.

[0096] In one embodiment, the spacing between the driving voltage signal line and other adjacent signal lines is greater than or equal to 0.2 mm. This is because the voltage on the driving voltage signal line VLEDL is relatively high (e.g., about 10 to 50 V), while the voltages of other signal lines adjacent to the driving voltage signal line VLEDL are generally relatively low. If the spacing is too small, it is easy to cause line breakdown and other undesirable phenomena.

[0097] In one embodiment, Figure 1 As shown, the common voltage signal line GNDL of the first column of light-emitting units or the Nth column of light-emitting units includes a first connection portion 34 located in the first frame area 120 or the second frame area 130; the spacing between the geometric center of the multiple terminals of the driving circuit of the light-emitting unit column where the first connection portion 34 is located and the first connection portion 34 in the second direction D2 is greater than or equal to 1.35 mm. The geometric center of the multiple terminals of the driving circuit refers to the center of a figure formed by connecting multiple terminals in sequence. Figure 1 In the illustrated embodiment, the first connection portion 34 is located in the second border region 130. In other embodiments, the first connection portion 34 may also be located in the first border region 120.

[0098] The light-emitting substrate also includes a protective glue covering the driving circuit. If the protective glue covers the common voltage signal line GNDL, the protective glue expands and contracts during the reliability test of the light-emitting substrate, which easily causes the common voltage signal line GNDL to peel off from the adjacent film layer, thereby affecting the reliability of the light-emitting substrate. By setting the spacing between the geometric centers of the first connecting portion 34 and the corresponding multiple terminals of the driving circuit in the second direction D2 to be greater than or equal to 1.35 mm, it is helpful to avoid the first connecting portion 34 from peeling off from the adjacent film layer due to the protective glue covering the first connecting portion 34, thereby improving the reliability of the light-emitting substrate; and by setting the spacing between the geometric centers of the first connecting portion 34 and the corresponding multiple terminals of the driving circuit in the second direction D2 to be greater than or equal to 1.35 mm, there is no need to set a groove facing the light-emitting area 110 on the first connecting portion 34, thereby effectively avoiding the protective glue from covering the first connecting portion 34, thereby the width of the first connecting portion 34 can be set to be smaller, thereby further reducing the width of the frame where the first connecting portion 34 is located.

[0099] Furthermore, the distance between the geometric center of the multiple terminals of the driving circuit of the light-emitting unit column where the first connecting portion 34 is located and the first connecting portion 34 in the second direction is smaller than the size of the light-emitting unit in the second direction D2. This arrangement can avoid the distance between the first connecting portion 34 and the geometric center of the multiple terminals of the driving circuit being too large, so that the density of the light-emitting units in the light-emitting substrate is relatively small.

[0100] In one embodiment, a groove is provided on one side of the first connection portion 34 facing the light emitting area 110. This configuration helps to prevent the protective glue from covering the first connection portion 34, thereby preventing the first connection portion 34 from peeling off from the adjacent film layer, thereby improving the reliability of the light emitting substrate.

[0101] In one embodiment, Figure 1 As shown, the driving voltage signal line VLEDL of the first column of light-emitting units or the Nth column of light-emitting units includes a second connection portion 35 located in the first frame area 120 or the second frame area 130. A groove is provided on the side of the second connection portion 35 facing the light-emitting area 110. Such a configuration helps to prevent the second connection portion 35 from being peeled off from the adjacent film layer due to the protective glue covering the second connection portion 35, thereby improving the reliability of the light-emitting substrate. Figure 1 In the illustrated embodiment, the second connection portion 35 is located in the first border region 120. In other embodiments, the second connection portion 35 may also be located in the second border region 130.

[0102] In one embodiment, Figure 2 As shown, the light-emitting area 110 includes a plurality of sub-light-emitting areas 109, and the sub-light-emitting areas 109 are provided with four columns of light-emitting units 101; in each of the sub-light-emitting areas 109, the feedback signal line of the fourth column of light-emitting units includes the first extension section 311, the connection section 312 and the second extension section 313 connected in sequence; in the same sub-light-emitting area 109, the second extension section 313 is located on one side of the feedback signal line FBL of the second column of light-emitting units. In this way, the positive projection of the second extension section 313 and the feedback signal line FBL of the second column of light-emitting units located in the fan-out area 151 in the second direction D2 and the positive projection of the bending portion 32 of other signal lines in the second direction D2 do not overlap, thereby reducing the width of the fourth frame area 150 or reducing the temperature rise of the fan-out area during the operation of the light-emitting substrate. Figure 2 In the illustrated embodiment, within the same sub-light-emitting area 109, the feedback signal line FBL of the first column of light-emitting units, the feedback signal line FBL of the second column of light-emitting units, and the feedback signal line FBL of the third column of light-emitting units are all routed to the side of the common voltage signal line GNDL of the light-emitting unit column in which they are located away from the first border area 120.

[0103] Figure 2In the illustrated embodiment, among the signal lines of the same sub-light-emitting area, the orthographic projections of the second extension section 313 and the part of the feedback signal line FBL of the second column of light-emitting units located in the fan-out area 151 in the second direction D2, the orthographic projections of the bending portion VLE1 of the driving voltage signal line VLEDL in the second direction D2, the orthographic projections of the bending portion GND1 of the common voltage signal line GNDL in the second direction D2, the orthographic projections of the bending portion Pwr1 of the power line PwrL in the second direction D2, the orthographic projections of the bending portion ADD1 of the addressing signal line ADDRL in the second direction D2, and the orthographic projections of the bending portion FB1 of other feedback signal lines FBL in the second direction do not overlap.

[0104] In an exemplary embodiment, if the feedback signal line FBL is wound around to the side of the common voltage signal line GNDL of the light-emitting unit column in which it is located away from the first border area 120, and the feedback signal line FBL includes a bending portion located in the fan-out area, in order to prevent signal crosstalk, the distance between the bending portion FB1 of the feedback signal line FBL and the bending portion GND1 of the adjacent common voltage signal line GNDL in the first direction needs to be greater than or equal to 0.1 mm, the distance between the bending portion FB1 of the feedback signal line FBL and the bending portion of the adjacent shielding ring in the fan-out area in the first direction needs to be greater than or equal to 0.2 mm, and the size of the bending portion FB1 of the feedback signal line in the first direction is greater than or equal to 0.11 mm.

[0105] By setting the feedback signal line FBL of the fourth column of light-emitting units in each sub-light-emitting area to go around to the side of the common voltage signal line GNDL of the light-emitting unit column to which it is located away from the first border area 120, the part of the feedback signal line FBL of the fourth column of light-emitting units located in the fan-out area 151 can be made to have no overlap with the projection of the bent portion of other signal lines in the second direction, and the total width saved in the fourth border area is the sum of the distance between the bent portion of the feedback signal line FBL of the fourth column of light-emitting units and the bent portion GND1 of the adjacent common voltage signal line GNDL in the first direction, the distance between the bent portion of the feedback signal line FBL of the fourth column of light-emitting units and the bent portion of the adjacent shielding ring Guard in the fan-out area in the first direction, and the size of the bent portion FB1 of the feedback signal line in the first direction, which is greater than or equal to 0.41 mm in total.

[0106] The width saved in the fourth border area can be used to increase the width of the large current signal line, for example, the width of the driving voltage signal line VLEDL and the common voltage signal line GND can be increased. In an exemplary embodiment, the width of the bending portion of the driving voltage signal line VLEDL can be increased by 0.15mm, and the width of the bending portion of the common voltage signal line GND can be increased by 0.25mm. After the width of the bending portion of the driving voltage signal line VLEDL and the width of the bending portion of the common voltage signal line GND are increased, their resistance is reduced, and then the heat generated during the operation of the light-emitting substrate is reduced, which can reduce the temperature rise of the fan-out area. After simulation tests, when the width of the driving voltage signal line VLEDL increases from 0.54mm to 0.69mm, and the width of the common voltage signal line GND increases from 0.54mm to 0.78mm, the temperature rise of the fan-out area can be reduced from 20°C to 15°C.

[0107] In one embodiment, the width of the bent portion GND1 of at least one of the common voltage signal lines GNDL located in the fan-out region is in the range of 0.7 mm to 1.0 mm. In this way, the resistance of the bent portion GND1 of the common voltage signal line GNDL is small, and the heat generated by the bent portion GND1 of the common voltage signal line GNDL during operation of the light-emitting substrate is small, which helps to reduce the temperature rise of the fan-out region.

[0108] In one embodiment, the width of the bent portion VLE1 of at least one driving voltage signal line VLEDL located in the fan-out region is in the range of 0.7 mm to 1.0 mm. In this way, the resistance of the bent portion VLE1 of the driving voltage signal line VLEDL is small, and the heat generated by the bent portion VLE1 of the driving voltage signal line VLEDL during operation of the light-emitting substrate is small, which helps to reduce the temperature rise of the fan-out region.

[0109] In one embodiment, the signal lines, the first pad and the second pad of the light-emitting substrate are arranged in the same layer. Each signal line may include a wire, a cascade line, a drive voltage signal line VLEDL, an addressing signal line ADDRL, a power signal line PwrL, a common voltage signal line GNDL, a feedback signal line FBL and a shielding ring Guard as described above. It should be noted that the term "A and B are arranged in the same layer" means that A and B are located on the surface of the same film layer and are in direct contact with the surface. In some embodiments, A and B are formed by the same film layer in a single patterning process. In some embodiments, A and B are located on the surface of the same film layer and are in direct contact with the surface, and A and B have substantially the same height or thickness. In another embodiment, the signal lines, the first pad and the second pad of the light-emitting substrate may be located in different layers, for example, they may be distributed in two metal film layers.

[0110] The present application also provides a method for preparing a light-emitting substrate. The preparation method may include the following steps:

[0111] First, a substrate is provided.

[0112] The substrate may be any appropriate substrate such as a plastic substrate, a silicon substrate, a ceramic substrate, a glass substrate, a quartz substrate, etc. The embodiment of the present application does not limit the material of the substrate.

[0113] Subsequently, a conductive film layer is formed on the substrate, and a conductive layer is formed by patterning the conductive film layer. The conductive layer includes signal lines, a first pad, and a second pad.

[0114] Subsequently, a plurality of driving circuits and a plurality of light-emitting elements are mounted on the conductive layer to form a plurality of light-emitting units arranged in an array, each light-emitting unit including a driving circuit and at least one light-emitting element connected to the driving circuit. The signal line is configured to transmit an electrical signal to the driving circuit and the light-emitting element in each light-emitting unit.

[0115] In one embodiment, a conductive film layer can be formed on the substrate by a magnetron sputtering method or an electroplating method, and the conductive film layer is patterned to simultaneously form each signal line, a first pad, and a second pad. Since the thickness of a single magnetron sputtering generally does not exceed 1 μm, when making a conductive layer exceeding 1 μm, multiple sputterings are usually required to form it. Each signal line may include the wires, cascade lines, drive voltage signal lines VLEDL, addressing signal lines ADDRL, power signal lines PwrL, common voltage signal lines GNDL, feedback signal lines FBL, and shielding rings Guard as described above.

[0116] In an exemplary embodiment, the formation process of the conductive film layer can be as follows: first, a Cu layer with a thickness of, for example, 2 um is formed on the substrate to transmit various electrical signals; then, a CuNi layer with a thickness of, for example, 0.6 um is formed on the Cu layer, and the CuNi layer can be used to protect the Cu layer and prevent the surface of the Cu layer with low resistivity from being exposed and oxidized. In another example, the formation process of the conductive layer can be as follows: first, a Cu layer with a thickness of approximately 2 um is formed on the substrate; A MoNb layer is formed on the MoNb layer to improve the adhesion between the film layer and the substrate; a Cu layer is then formed on the MoNb layer to transmit various electrical signals; and finally a Cu layer with a thickness of about 1000 nm is formed on the Cu layer. The MoNb or MoNiTi or CuNi layer is formed to protect the middle Cu layer and prevent the surface of the middle Cu layer with low resistivity from being exposed and oxidized.

[0117] In another embodiment, a conductive film layer may be formed on the substrate by electroplating, and the formation process may be as follows: first, a seed layer is formed using MoNiTi to increase the nucleation density of metal grains in the subsequent electroplating process, and then a Cu layer with low resistivity is formed by electroplating, and then an anti-oxidation layer is formed, and the material may be MoNiTi. The conductive layer may be cleaned, coated, baked, photolithographic, developed, hard baked, etched, stripped, etc., to form each signal line, the first pad, and the second pad.

[0118] In one embodiment, the method for preparing the light-emitting substrate further comprises: forming a first insulating layer by magnetron sputtering on the side of the layer where the conductive layer is located away from the substrate. The first insulating layer can be used to protect the conductive layer to prevent it from being oxidized and corroded by water, oxygen, etc. in the environment. The material of the first insulating layer can be an organic material, an inorganic material, or a combination of an organic material and an inorganic material, and the first insulating layer can be a single film layer or include multiple film layers.

[0119] In one embodiment, the method for preparing the light-emitting substrate further includes: coating a second insulating film layer on a side of the first insulating layer away from the substrate, and performing several processes such as curing, exposing, developing, and etching on the second insulating film layer to form the second insulating layer. The material of the second insulating layer can be an organic material, an inorganic material, or a combination of an organic material and an inorganic material. The second insulating layer can be a single film layer or can include multiple film layers. When the second insulating layer is formed on the light-emitting substrate, the second insulating layer and the first insulating layer are etched to form multiple vias.

[0120] In one embodiment, after the step of installing a plurality of driving circuits and a plurality of light-emitting elements on the conductive layer to form a plurality of light-emitting units arranged in an array, the method for preparing the light-emitting substrate may further include: cutting the light-emitting substrate into a specified shape, electrically connecting the driving circuit and the light-emitting unit to the first pad and the second pad through the plurality of vias, respectively, so as to install the driving circuit and the light-emitting element on the corresponding pads. Each signal line is connected to the flexible circuit board at the binding area, thereby realizing the electrical connection between the driving circuit and the flexible circuit board, and finally obtaining the desired light-emitting substrate.

[0121] In one embodiment, the light-emitting substrate is a backlight source, which can be used as a backlight source in a display device to provide a display light source for a display panel in the display device. Of course, the backlight source can also be used in any other device that requires a light source, and this application does not specifically limit the use of the backlight source.

[0122] In one embodiment, the light-emitting substrate may be a mini LED light-emitting substrate, that is, the light-emitting element is a mini LED. In another embodiment, the light-emitting substrate may be a micro LED light-emitting substrate, that is, the light-emitting element is a micro LED.

[0123] An embodiment of the present application further provides a display device, comprising any of the above-mentioned light-emitting substrates.

[0124] In some embodiments, the display device may be a liquid crystal display device, which includes a liquid crystal panel and a backlight source disposed on the non-display side of the liquid crystal panel, the backlight source including the light-emitting substrate described in any of the previous embodiments, for example, which may be used to implement HDR dimming for display operation. The liquid crystal display device may have more uniform backlight brightness and better display contrast.

[0125] In another embodiment, the light-emitting substrate in the display device is used as a display substrate. When the light-emitting substrate is used as a display substrate, each light-emitting element serves as a sub-pixel.

[0126] The display device may be any appropriate display device, including but not limited to any product or component with a display function, such as a mobile phone, a tablet computer, a television, a monitor, a laptop computer, a digital photo frame, a navigator, an e-book, etc.

[0127] It is understood that the appendix to this application Figures 1 to 4 The diagrams are only used to schematically illustrate the connection relationship between the driving circuit, the light-emitting unit, and each signal line and pad. The sizes of the driving circuit, the light-emitting unit, each signal line and pad are not drawn to scale, and their relative positions do not necessarily correspond exactly to the actual positions. In the drawings, the proportions of certain regions and layers may be exaggerated for clarity.

[0128] It should be noted that in the accompanying drawings, the sizes of layers and regions may be exaggerated for clarity of illustration. It is also understood that when an element or layer is referred to as being "on" another element or layer, it may be directly on the other element, or there may be an intermediate layer. In addition, it is understood that when an element or layer is referred to as being "under" another element or layer, it may be directly under the other element, or there may be more than one intermediate layer or element. In addition, it is also understood that when a layer or element is referred to as being "between" two layers or two elements, it may be the only layer between the two layers or two elements, or there may also be more than one intermediate layer or element. Similar reference numerals throughout the text indicate similar elements.

[0129] Those skilled in the art will readily appreciate other embodiments of the present application after considering the description and practicing the contents disclosed herein. The present application is intended to cover any variations, uses or adaptations of the present application, which follow the general principles of the present application and include common knowledge or customary techniques in the art that are not disclosed in the present application. The description and examples are intended to be exemplary only, and the true scope and spirit of the present application are indicated by the following claims.

[0130] It should be understood that the present application is not limited to the precise structures that have been described above and shown in the drawings, and that various modifications and changes may be made without departing from the scope thereof. The scope of the present application is limited only by the appended claims.

Claims

1. A light-emitting substrate, characterized in that: The light-emitting substrate comprises a light-emitting area and a frame area; The light-emitting substrate comprises a substrate, and a plurality of light-emitting units and a plurality of signal lines located on the substrate; the light-emitting unit is located in the light-emitting area, and comprises a driving circuit and at least one light-emitting element connected to the driving circuit; the plurality of light-emitting units are arranged into M rows along a first direction and arranged into N columns along a second direction intersecting the first direction, and M and N are both positive integers greater than or equal to 1; the plurality of signal lines comprise N target signal lines extending along the first direction; the border area comprises an area of ​​the light-emitting substrate located outside the light-emitting units in the first column, an area located outside the light-emitting units in the Nth column, and an area located outside the light-emitting units in the first row; The target signal line of the first column of light-emitting units and / or the target signal line of the Nth column of light-emitting units comprises a first extension section, a connecting section and a second extension section connected in sequence, the first extension section is connected to the driving circuit and is located in the border area, the first extension section, the connecting section and the second extension section are enclosed to form a containing area, the containing area surrounds at least two groups of light-emitting units, and the length of the first extension section is less than the length of the second extension section; The light-emitting substrate further includes N common voltage signal lines extending along the first direction, and a driving circuit of a column of light-emitting units is connected to one common voltage signal line; the frame area includes a first frame area and a second frame area that are arranged opposite to each other, the first frame area is an area of ​​the light-emitting substrate located outside the first column of light-emitting units, and the second frame area is an area of ​​the light-emitting substrate located outside the Nth column of light-emitting units; The target signal line is a feedback signal line; the light-emitting area includes a plurality of sub-light-emitting areas, and the sub-light-emitting areas are provided with four columns of light-emitting units; in each of the sub-light-emitting areas, the feedback signal line of the fourth column of light-emitting units includes the first extension section, the connection section and the second extension section connected in sequence; in the same sub-light-emitting area, the second extension section is located on one side of the feedback signal line of the second column of light-emitting units; The feedback signal lines of the first column of light emitting units, the second column of light emitting units and the third column of light emitting units are all routed to a side of the common voltage signal line of the light emitting unit column away from the first frame area.

2. The light-emitting substrate according to claim 1, characterized in that: The border area includes a first border area, a second border area and a third border area, the first border area and the second border area extend along the first direction and are arranged opposite to each other, and the third border area extends along the second direction; the first border area is an area where the light-emitting substrate is located outside the first column of light-emitting units, the second border area is an area where the light-emitting substrate is located outside the Nth column of light-emitting units, and the third border area is an area where the light-emitting substrate is located outside the first row of light-emitting units; The first extending section is located in the second frame area or the first frame area, the connecting section is located in the third frame area, and the second extending section is located in the light emitting area.

3. The light-emitting substrate according to claim 2, characterized in that: The border area also includes a fourth border area arranged opposite to the third border area, and the fourth border area is an area of ​​the light-emitting substrate located outside the Mth row of light-emitting units; the fourth border area includes a binding area, and the second extension section is connected to the binding area.

4. The light-emitting substrate according to claim 3, characterized in that: The light-emitting area includes a plurality of sub-light-emitting areas arranged along the second direction, each sub-light-emitting area is provided with a plurality of columns of light-emitting units; the binding area includes a plurality of sub-binding areas, and a signal line of a sub-light-emitting area is connected to a sub-binding area.

5. The light-emitting substrate according to claim 4, characterized in that: The sub-binding area is provided with a binding terminal for connecting to the corresponding sub-light-emitting area, and the binding terminal connected to the second extension section is located between the binding terminals corresponding to two sub-light-emitting areas adjacent to the sub-light-emitting area where the second extension section is located.

6. The light-emitting substrate according to claim 1, characterized in that: The light-emitting area includes a plurality of sub-light-emitting areas arranged along the second direction, each sub-light-emitting area is provided with a plurality of columns of light-emitting units; a driving circuit of a column of light-emitting units is connected to one of the target signal lines; In the sub-light-emitting area where the first column of light-emitting units is located, at least two target signal lines enclose a containing area surrounding at least two groups of light-emitting units; and / or, in the sub-light-emitting area where the Nth column of light-emitting units is located, at least two target signal lines enclose a containing area surrounding at least two groups of light-emitting units.

7. The light-emitting substrate according to claim 1, characterized in that: The light-emitting area includes a plurality of sub-light-emitting areas arranged along the second direction, each sub-light-emitting area is provided with X columns of light-emitting units, X is an even number; in the same sub-light-emitting area, the second extension section is located between the light-emitting units in the X / 2th column and the light-emitting units in the X / 2+1th column.

8. The light emitting substrate according to claim 1, characterized in that: The light-emitting area includes a plurality of sub-light-emitting areas arranged along the second direction, each sub-light-emitting area is provided with X columns of light-emitting units, where X is a positive integer greater than or equal to 1; The target signal lines of the light-emitting units in the first column and / or the target signal lines of the light-emitting units in the Xth column of each sub-light-emitting area are enclosed to form an accommodating area surrounding at least two groups of light-emitting units.

9. The light-emitting substrate according to claim 8, characterized in that: The border area includes a fan-out area; among the plurality of signal lines, at least one of the signal lines includes a bending portion extending along the first direction, and the bending portion is located in the fan-out area; An orthographic projection of a portion of the second extending section located in the fan-out region in the second direction does not overlap with an orthographic projection of the bending portion in the second direction.

10. The light emitting substrate according to claim 1, characterized in that: The target signal line is connected to the driving circuit of the light emitting unit in the first row.

11. The light emitting substrate according to claim 1, characterized in that: The driving circuit includes an address terminal and a relay terminal, the address terminal is configured to receive an address signal, and the relay terminal is configured to output a relay signal; the driving circuits in each column of light-emitting units are cascaded in sequence, the address terminal of the i-th driving circuit is located on the side of the i-th driving circuit close to the i-1-th driving circuit, and the relay terminal of the i-th driving circuit is located on the side of the i-th driving circuit close to the i+1-th driving circuit, 1<i<M and i is a positive integer; the first extension section is connected to the relay terminal of the driving circuit.

12. The light emitting substrate according to claim 1, characterized in that: The plurality of signal lines are arranged on the same layer.

13. The light emitting substrate according to claim 1, characterized in that: The light-emitting substrate further comprises a shielding ring, which is located in the frame area and surrounds the periphery of the light-emitting area; The distance between the connecting section and the shielding ring in the first direction is greater than or equal to 0.2 mm.

14. The light emitting substrate according to claim 1, characterized in that: The light-emitting substrate further includes N driving voltage signal lines extending along the first direction, and one column of light-emitting units is connected to one driving voltage signal line; The spacing between the driving voltage signal line and other adjacent signal lines is greater than or equal to 0.2 mm.

15. The light emitting substrate according to claim 1, characterized in that: The target signal line is a feedback signal line; the second extension section is adjacent to a feedback signal line, and a distance between the second extension section and the adjacent feedback signal line in the second direction is greater than or equal to 0.05 mm.

16. The light emitting substrate according to claim 1, characterized in that: The common voltage signal line of the first column of light-emitting units or the Nth column of light-emitting units includes a first connecting portion located in the first border area or the second border area; the driving circuit includes multiple terminals, and the geometric center of the multiple terminals of the driving circuit of the light-emitting unit column where the first connecting portion is located is greater than or equal to 1.35 mm from the first connecting portion in the second direction.

17. The light emitting substrate according to claim 16, characterized in that: The distance between the geometric centers of the plurality of terminals of the driving circuit of the light emitting unit column where the first connecting portion is located and the first connecting portion in the second direction is smaller than the size of the light emitting unit in the second direction.

18. The light emitting substrate according to claim 1, characterized in that: The common voltage signal line of the first column of light-emitting units or the Nth column of light-emitting units includes a first connecting portion located in the first border area or the second border area; a groove is provided on a side of the first connecting portion facing the light-emitting area.

19. The light emitting substrate according to claim 1, characterized in that: The light-emitting substrate further includes N driving voltage signal lines extending along the first direction, and a driving circuit of a column of light-emitting units is connected to a driving voltage signal line; the frame area includes a first frame area and a second frame area that are arranged opposite to each other, the first frame area is an area of ​​the light-emitting substrate located outside the first column of light-emitting units, and the second frame area is an area of ​​the light-emitting substrate located outside the Nth column of light-emitting units; The driving voltage signal line of the first column of light-emitting units or the Nth column of light-emitting units includes a second connecting portion located in the first border area or the second border area; a groove is provided on a side of the second connecting portion facing the light-emitting area.

20. The light emitting substrate according to claim 1, characterized in that: The target signal line is a feedback signal line, the plurality of signal lines further include a driving voltage signal line, a power signal line and a common voltage signal line; the driving circuit includes an address terminal, a relay terminal, a power terminal and a common voltage terminal; The driving circuits in each column of light-emitting units are cascaded in sequence, the address terminal of the i-th driving circuit is located on the side of the i-th driving circuit close to the i-1-th driving circuit, the relay terminal of the i-th driving circuit is located on the side of the i-th driving circuit close to the i+1-th driving circuit, 1<i<M and i is a positive integer; the first extension section of the feedback signal line is connected to the relay terminal of the last driving circuit; In the first direction, among the light emitting unit and the signal line connected to the light emitting unit, the driving voltage signal line, the light emitting element, the driving circuit, the power signal line and the common voltage signal line are arranged in sequence.

21. The light emitting substrate according to claim 1, characterized in that: The border area includes a fourth border area extending along the second direction, and the fourth border area is an area of ​​the light-emitting substrate located outside the Mth row of light-emitting units; the fourth border area includes a plurality of sub-binding areas; the light-emitting area includes a plurality of sub-light-emitting areas, and the sub-light-emitting areas are provided with a plurality of columns of light-emitting units; a signal line of one of the sub-light-emitting areas is connected to a binding terminal of the same sub-binding area, and the binding terminal of the same sub-binding area is connected to a flexible circuit board.

22. A display device, characterized in that: The display device includes the light emitting substrate according to any one of claims 1 to 21.

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