Display panel and display device

Abstract

The invention discloses a display panel and a display device, and relates to the technical field of display devices. An active layer on the surface of the substrate; the active layer comprises a plurality of active branches which are sequentially arranged in the first direction, and the active branches extend in the second direction; the first direction and the second direction intersect and are parallel to the plane where the substrate is located. Each active branch comprises a source end, a drain end and a channel region located between the source end and the drain end; the source end is connected with the source electrode and the drain end is connected with the drain electrode; the grid electrode extends along a second direction; in the direction perpendicular to the plane where the substrate is located, the grid electrode and the channel region of the active branch are both provided with overlapped parts. Wherein the plurality of active branches at least comprise a first active branch and a second active branch, the direction from the source end to the drain end of the first active branch is a second direction, and the direction from the source end to the drain end of the second active branch is a direction opposite to the second direction. According to the technical scheme, the heat dissipation effect of the transistor can be improved.

Description

Technical Field

[0001] The present application relates to the technical field of display devices, and in particular to a display panel and a display device. Background Art

[0002] With the continuous development of science and technology, more and more display devices are widely used in people's daily life and work, bringing great convenience to people's daily life and work, and becoming an indispensable tool for people today. The main component of a display device to realize the display function is a display panel.

[0003] The pixels in the display panel need to be controlled by the pixel circuit for image display. The pixel circuit includes multiple interconnected transistors. In order to improve the driving capability of existing transistors, it is necessary to increase the output current of the transistor by increasing the channel size. The larger output current will cause a lot of heat to be generated during the operation of the transistor, which will affect the performance of the transistor. Summary of the invention

[0004] In view of the above problems, the present application provides a display panel and a display device, which can improve the heat dissipation effect of transistors. The specific solution is as follows:

[0005] A first aspect of the present application provides a display panel, comprising:

[0006] substrate;

[0007] An active layer is located on the surface of the substrate; the active layer includes a plurality of active branches arranged in sequence in a first direction, and the active branches extend along a second direction; the first direction and the second direction intersect and are both parallel to the plane where the substrate is located; the active branches include a source terminal, a drain terminal, and a channel region located between the source terminal and the drain terminal; the source terminal is connected to the source electrode, and the drain terminal is connected to the drain electrode;

[0008] A gate extending along a second direction; in a direction perpendicular to the plane where the substrate is located, the gate and the channel region of the active branch have overlapping portions;

[0009] Among them, the multiple active branches include at least a first active branch and a second active branch, the direction from the source end to the drain end of the first active branch is the second direction, and the direction from the source end to the drain end of the second active branch is the opposite direction of the second direction.

[0010] A second aspect of the present application provides a display device, comprising the above-mentioned display panel.

[0011] By means of the above technical scheme, in the display panel and the display device provided by the present application, an active layer is provided including a plurality of active branches arranged in sequence in a first direction, the active branches including a source terminal, a drain terminal and a channel region located between the source terminal and the drain terminal, so that each active branch can form a sub-transistor, and a transistor can be divided into a plurality of sub-transistors, which can reduce the self-heating of the transistor, reduce the heat generated when the transistor is working, avoid affecting the performance of the transistor due to excessive heat, avoid affecting the performance of the transistor due to excessive heat, and improve the image display quality.

[0012] In addition, the multiple active branches of the active layer include a first active branch and a second active branch. Since the directions from the source end to the drain end in the first active branch and the second active branch are opposite and both are parallel to the second direction, in the second direction, the drain ends of at least two sub-transistors can be located on different sides of the channel region, thereby avoiding the problem of heat concentration caused by the drain ends of all sub-transistors being concentrated on the same side, facilitating the heat dissipation of the transistor, avoiding the impact of excessive heat on the performance of the transistor, and improving the image display quality. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the related technologies, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on the provided drawings without paying any creative work.

[0014] The structures, proportions, sizes, etc. illustrated in the drawings of this specification are only used to match the contents disclosed in the specification so as to facilitate understanding and reading by persons familiar with this technology. They are not used to limit the conditions under which this application can be implemented, and therefore have no substantive technical significance. Any structural modification, change in proportion or adjustment of size, without affecting the effects and purposes that can be achieved by this application, should still fall within the scope of the technical contents disclosed in this application.

[0015] Figure 1 is a structural schematic diagram of a display panel;

[0016] Figure 2 A top view of a transistor in a display panel provided in an embodiment of the present application;

[0017] Figure 3 for Figure 2 The cross-sectional view of the display panel in the AA' direction is shown;

[0018] Figure 4 for Figure 2 The cross-sectional view of the display panel in the BB' direction is shown;

[0019] Figure 5 A top view of an active layer in an embodiment of the present application;

[0020] Figure 6 A top view of another active layer in an embodiment of the present application;

[0021] Figure 7 A top view of another active layer in an embodiment of the present application;

[0022] Figure 8 A cross-sectional view of a display panel provided in an embodiment of the present application along the extension direction of the first active branch;

[0023] Fig. 9 A cross-sectional view of a display panel provided in an embodiment of the present application along the extension direction of the second active branch;

[0024] Fig.10 A cross-sectional view of a display panel provided in an embodiment of the present application along the length direction of an active branch;

[0025] Fig.11 A top view of a transistor in another display panel provided in an embodiment of the present application;

[0026] Fig.12 for Fig.11 The cross-sectional view of the display panel in the C-C' direction is shown;

[0027] Fig.13 for Fig.11 The cross-sectional view of the display panel in the D-D' direction is shown;

[0028] Fig.14 A top view of a transistor in another display panel provided in an embodiment of the present application;

[0029] Fig.15 for Fig.14 The cross-sectional view of the display panel in the E-E' direction is shown;

[0030] Fig.16 for Fig.14 The cross-sectional view of the display panel in the F-F' direction is shown;

[0031] Fig.17 A top view of an active branch provided in an embodiment of the present application;

[0032] Fig.18 A top view of another active branch provided in an embodiment of the present application;

[0033] Fig.19 A partial cross-sectional view of a display panel in a drain region provided in an embodiment of the present application;

[0034] Fig. 20 A partial cross-sectional view of another display panel in the drain region provided by an embodiment of the present application;

[0035] Fig.21 A schematic diagram of the connection principle between an active branch and an active layer in a display panel provided in an embodiment of the present application;

[0036] Fig. 22 A schematic diagram of the connection principle between an active branch and an active layer in another display panel provided in an embodiment of the present application;

[0037] Fig.23 A top view of an active layer provided in an embodiment of the present application;

[0038] Fig.24 A schematic diagram of the structure of a display device provided in an embodiment of the present application.

[0039] Reference numerals:

[0040] 10-active layer; 101-active branch; 11-source; 111-first source wiring; 112-second source wiring; 12-drain; 121-first drain wiring; 122-second drain wiring; 131-source terminal; 132-drain terminal; 133-channel region; 14-gate; 15-substrate; 161-first conductive hole; 162-second conductive hole; 171-first active branch; 172-second active branch; 181-first active branch group; 182 -second active branch group; 19-insulating layer; 191-first insulating layer; 192-second insulating layer; 201-first routing; 202-second routing; 203-third routing; 211-first comb teeth; 212-second comb teeth; 22-thermal conductive metal part; 23-thermal conductive structure; 24-light-shielding metal layer; 25-display panel; Y-first direction; X-second direction; Z-third direction; M1-first metal layer; M2-second metal layer; M3-third metal layer. DETAILED DESCRIPTION

[0041] The following will be combined with the drawings in the embodiments of the present application to clearly and completely describe the embodiments of the present application. It is known to those skilled in the art that with the development of technology and the emergence of new scenarios, the technical solutions provided in the embodiments of the present application are also applicable to similar technical problems.

[0042] Transistors can increase their output current by increasing their size, thereby improving their driving capabilities. However, a larger driving current will cause the transistor to generate more heat during operation. If the higher heat cannot be dissipated in time, it will affect the switching speed, power consumption and efficiency of the transistor. In order to reduce the heat generated by the transistor, you can Figure 1As shown, the transistor is divided into multiple sub-transistors.

[0043] refer to Figure 1 , Figure 1 is a structural schematic diagram of a display panel. Figure 1 The top view structure of a transistor in a display panel is shown. The transistor shown includes:

[0044] An active layer 10, the active layer 10 comprises a plurality of active branches 101 sequentially arranged along a first direction Y; the active branches comprise a source terminal 131, a channel region 133 and a drain terminal 132 sequentially arranged along a second direction X;

[0045] A source electrode 11 located on the active layer 10 , the source electrode 11 being connected to a source end 131 of each active branch 101 ;

[0046] The drain electrode 12 is located on the active layer 10 , and is connected to the drain terminals 132 of the active branches 101 .

[0047] The gate 14 located on the active layer 10 has overlapping portions with the channel regions 133 of each active branch 101 .

[0048] exist Figure 1 In the manner shown, the active layer 10 of a transistor is divided into multiple active branches 101, and each active branch 101 can form a sub-transistor, so that one transistor can be divided into multiple sub-transistors, and the high-temperature area of ​​the transistor can be dispersed, thereby facilitating the dissipation of heat in the transistor and improving the heat dissipation effect.

[0049] Although dividing a transistor into multiple sub-transistors can improve the heat dissipation effect of the transistor to a certain extent, since the current in the transistor is transmitted from the source terminal 131 to the drain terminal 132, and the drain terminal 132 serves as the current output terminal, the heat in the transistor is concentrated at the drain terminal 132. Figure 1 In the illustrated embodiment, all drain terminals 132 are located on the same side of the channel region 133, which causes the heat of all sub-transistors to be concentrated on the same side, making it inconvenient for the heat dissipation of the transistors, affecting the performance of the transistors, and further affecting the image display quality.

[0050] In order to solve the above problems, an embodiment of the present application provides a display panel, including:

[0051] substrate;

[0052] An active layer is located on the surface of the substrate; the active layer includes a plurality of active branches arranged in sequence in a first direction, and the active branches extend along a second direction; the first direction and the second direction intersect and are both parallel to the plane where the substrate is located; the active branches include a source terminal, a drain terminal, and a channel region located between the source terminal and the drain terminal; the source terminal is connected to the source electrode, and the drain terminal is connected to the drain electrode;

[0053] A gate extending along a second direction; in a direction perpendicular to the plane where the substrate is located, the gate and the channel region of the active branch have overlapping portions;

[0054] Among them, the multiple active branches include at least a first active branch and a second active branch, the direction from the source end to the drain end of the first active branch is the second direction, and the direction from the source end to the drain end of the second active branch is the opposite direction of the second direction.

[0055] In an embodiment of the present application, the active layer is divided into multiple active branches, each active branch can form a sub-transistor, which can reduce the self-heating of the transistor, reduce the heat generated when the transistor is working, and avoid affecting the performance of the transistor due to excessive heat.

[0056] Moreover, the multiple active branches of the active layer include a first active branch and a second active branch. Since the directions from the source end to the drain end in the first active branch and the second active branch are opposite and both are parallel to the second direction, in the second direction, the drain ends of at least two sub-transistors can be located on different sides of the channel region, thereby avoiding the problem of heat concentration caused by the drain ends of all sub-transistors being concentrated on the same side, facilitating the heat dissipation of the transistor, avoiding the impact of excessive heat on the performance of the transistor, and improving the image display quality.

[0057] In order to make the above-mentioned purposes, features and advantages of the present application more obvious and easy to understand, the present application is further described in detail below with reference to the accompanying drawings and specific embodiments.

[0058] refer to Figure 2-Figure 4 , Figure 2 A top view of a transistor in a display panel provided in an embodiment of the present application, Figure 3 for Figure 2 The cross-sectional view of the display panel in the A-A' direction is shown. Figure 4 for Figure 2 The cross-sectional view of the display panel in the BB' direction. The display panel includes:

[0059] Base 15;

[0060] An active layer 10, the active layer 10 is located on the surface of the substrate 15; the active layer 10 includes a plurality of active branches 101 arranged in sequence in a first direction Y, and the active branches 101 extend along a second direction X; the first direction Y and the second direction X intersect and are both parallel to the plane where the substrate 15 is located; the active branch 101 includes a source terminal 131, a drain terminal 132, and a channel region 133 located between the source terminal 131 and the drain terminal 132; the source terminal 131 is connected to the source electrode 11, and the drain terminal 132 is connected to the drain electrode 12;

[0061] The gate 14 extends along the second direction X; in a direction perpendicular to the plane where the substrate 15 is located, the gate 14 and the channel region 133 of the active branch 101 have overlapping portions;

[0062] Among them, the multiple active branches 101 include at least a first active branch 171 and a second active branch 172, the direction from the source end 131 to the drain end 132 of the first active branch 171 is the second direction X, and the direction from the source end 131 to the drain end 132 of the second active branch 172 is the opposite direction of the second direction X.

[0063] Optionally, the first direction Y is perpendicular to the second direction X. A direction perpendicular to the plane where the substrate 15 is located is set as a third direction Z. The third direction Z is perpendicular to the first direction Y and the second direction X.

[0064] In the embodiment of the present application, the active layer 10 of a transistor is divided into a plurality of active branches 101. Based on the plurality of active branches 101, a large-sized transistor can be divided into a plurality of small-sized sub-transistors, and one active branch 101 forms a sub-transistor. Dividing a large-sized transistor into a plurality of small-sized sub-transistors can reduce the self-heating of the transistor, reduce the heat generated when the transistor is working, and avoid affecting the performance of the transistor due to excessive heat.

[0065] Further, the multiple active branches 101 of the active layer 10 include at least one first active branch 171 and one second active branch 172. Since the directions from the source end 131 to the drain end 132 in the first active branch 171 and the second active branch 172 are opposite and are parallel to the second direction X, the drain ends 132 of at least two sub-transistors can be located on different sides of the channel region 133 in the second direction X, and the drain ends 132 of at least two active branches 101 can be dispersed on different sides of the channel region 133, thereby improving the dispersion of the drain ends 132 in the active layer 10 and avoiding the heat concentration problem caused by the drain ends 132 of all sub-transistors being concentrated on the same side of the channel region 133.

[0066] refer to Figure 5 , Figure 5 This is a top view of an active layer in an embodiment of the present application. On the basis of the above embodiment, in the first direction Y, the plurality of active branches 101 include: a first active branch group 181 and a second active branch group 182 arranged in sequence; wherein the first active branch group 181 includes at least one first active branch 171, and the second active branch group 182 includes at least one second active branch 172. In this manner, the number of active branches 101 in the first active branch group 181 and the second active branch group 182 may be the same or different.

[0067] exist Figure 5In the illustrated manner, along the first direction Y, the plurality of active branches 101 in the active layer 10 are divided into two groups, and the two groups are respectively used as a first active branch group 181 and a second active branch group 182. The active branches 101 in the first active branch group 181 are first active branches 171, and the active branches 101 in the second active branch group 182 are second active branches 172. This manner can make the drain ends of the active branches 101 in the first active branch group 181 all located on the side of the channel region 133 facing the second direction X, and make the drain ends of the active branches 101 in the second active branch group 182 all located on the side of the channel region 133 away from the second direction X, so as to avoid the drain ends 132 of the active branches 101 being concentrated on the same side of the channel region 133, and can improve the dispersion degree of the drain ends 132, thereby improving the heat dissipation effect.

[0068] refer to Figure 6 , Figure 6 FIG. 1 is a top view of another active layer in an embodiment of the present application. On the basis of the above embodiment, in the first direction Y, the plurality of active branches 101 include: first active branch groups 181 and second active branch groups 182 arranged alternately. In this manner, at least the plurality of active branches 101 in the active layer 10 are divided into three groups. Of any two adjacent groups, one is the first active branch group 181 and the other is the second active branch group 182. Figure 5 The manner shown can further improve the dispersion of the drain terminal 132 to further enhance the heat dissipation effect.

[0069] When the active layer 10 includes the first active branch group 181 and the second active branch group 182, the first active branch group 181 and the second active branch group 182 may each include one active branch, and the distribution of the first active branch 171 and the second active branch 172 in the active layer 10 may be as follows: Figure 7 Shown

[0070] refer to Figure 7 , Figure 7 FIG. 1 is a top view of another active layer in an embodiment of the present application. Based on the above embodiment, the first active branch group 181 and the second active branch group 182 each include an active branch. In this way, on the same side of the channel region 133, along the first direction Y, the source end 131 and the drain end 132 of each active branch 101 are arranged alternately. Figure 8 In the embodiment, on the left side of the channel region 133, along the first direction Y, the source end 131 and the drain end 132 of each active branch 101 are arranged alternately; on the right side of the channel region 133, along the first direction Y, the source end 131 and the drain end 132 of each active branch 101 are arranged alternately. This method can maximize the dispersion of the drain end 132 and can better improve the heat dissipation effect.

[0071] exist Figure 2-Figure 4In the manner shown, taking the first active branches 171 and the second active branches 172 arranged alternately along the first direction Y as an example, the distribution of the active branches 101 in the active layer 10 can be as follows: Figure 7 shown.

[0072] It should be noted that the number of active branches 101 in the active layer 10 can be set to any number greater than 1 according to needs, such as 2, 3 or more. The embodiment of the present application does not limit the number of active branches 101 in the active layer 10.

[0073] In one implementation of the present application, the Figure 2-Figure 4 As shown, the gate 14 is located in the first metal layer M1, the drain 12 is located in the second metal layer M2, the source 11 is located in the third metal layer M3, and the active layer 10 is located between the second metal layer M2 and the third metal layer M3; the drain 12 includes a first drain wiring 121 and a second drain wiring 122 sequentially distributed along the second direction X, and the source 11 includes a first source wiring 111 and a second source wiring 112 sequentially distributed along the second direction X; in a direction perpendicular to the plane where the substrate is located, the gate 14 is located between the first drain wiring 121 and the second drain wiring 122, and between the first source wiring 111 and the second source wiring 112; wherein, in the first active branch 171, the source terminal 131 is connected to the first source wiring 111, and the drain terminal 132 is connected to the second drain wiring 122; in the second active branch 172, the source terminal 131 is connected to the second source wiring 112, and the drain terminal 132 is connected to the first drain wiring 121.

[0074] exist Figure 2-Figure 4 In the manner shown, the source 11 and the drain 12 are respectively prepared by two layers of metal, and the source 11 and the drain 12 are respectively located on opposite sides of the active layer 10. The source 11 and the drain 12 respectively have two wirings, so that when the drain terminals 132 of at least two active branches 101 are located on different sides of the channel region 133, the source terminals 131 of each active branch 101 are connected to the source 11, and the drain terminals 132 of each active branch 101 are connected to the drain 12, while improving the dispersion of the drain terminals 132, and facilitating the corresponding connection between the source and drain terminals and the source and drain in each sub-transistor.

[0075] In the embodiment of the present application, along the third direction Z, insulating layers 19 are respectively provided between adjacent metal layers and between the active layer 10 and the adjacent metal layer to prevent short circuit problems.

[0076] In the embodiment of the present application, the first metal layer M1 may be disposed between the second metal layer M2 and the active layer 10. In this manner, since the first metal layer M1 and the insulating layer 19 covered on its surface will increase the vertical distance between the drain terminal 132 and the drain electrode 12, the heat transfer distance from the drain terminal 132 to the drain electrode 12 will be increased, which makes it difficult for the heat to be transferred from the drain terminal 132 to the drain electrode 12 in a timely manner.

[0077] In order to allow the heat in the drain terminal 132 to be quickly transferred to the drain electrode 12, in one implementation of the embodiment of the present application, Figure 3 and Figure 4 As shown, the first metal layer M1 is arranged between the third metal layer M3 and the active layer 10. In this way, the first metal layer M1 and the insulating layer 19 covered on the surface thereof can be prevented from increasing the heat transfer distance from the drain terminal 132 to the drain electrode 12, and the heat can be quickly transferred from the drain terminal 132 to the drain electrode 12, so as to quickly dissipate the heat to other areas through the drain electrode 12, thereby improving the heat dissipation efficiency.

[0078] In one implementation of the present application, Figure 3 and Figure 4 As shown, the second metal layer M2 is located between the substrate 15 and the active layer 10. Above the source, drain and transistor formed by the active layer, it is necessary to set the pixel and cover plate of the display panel, and these structures will affect the upward conduction of heat. In this way, the second metal layer M2 is set on the side of the active layer 10 facing the substrate 15, so that the drain 12 can be closer to the bottom of the substrate 15, and the heat conduction path toward the bottom of the substrate 15 can be shortened, so that the heat is more conducted toward one side of the drain 12, and the heat conducted from the drain terminal 132 to the drain 12 can be quickly dissipated to the outside of the display panel through the bottom of the substrate 15, thereby improving the heat dissipation efficiency.

[0079] When the gate 14 is located in the first metal layer M1, the drain 12 is located in the second metal layer M2, the source 11 is located in the third metal layer M3, the drain 12 includes a first drain wiring 121 and a second drain wiring 122 distributed in sequence along the second direction X, and the source 11 includes a first source wiring 111 and a second source wiring 112 distributed in sequence along the second direction X, the source terminal 131 can be set to be connected to the source 11 through the first conductive hole 161, and the drain terminal 132 can be connected to the drain 12 through the second conductive hole 162.

[0080] refer to Figure 8 and Fig. 9 , Figure 8 A cross-sectional view of a display panel provided in an embodiment of the present application along the extension direction of the first active branch, Fig. 9A cross-sectional view of a display panel provided in an embodiment of the present application along the extension direction of the second active branch. The active branch 101 extends along the second direction X, and the second direction X is the length direction of the active branch 101. Therefore, the length directions of the first active branch 171 and the second active branch 172 are both in the second direction X.

[0081] Based on the above implementation method, Figure 8 and Fig. 9 In the display panel shown, the second metal layer M2 is located on the side of the active layer 10 away from the substrate 15. This method can make the drain 12 closer to the pixel arranged above, and can shorten the distance between the drain 12 and the pixel. In the display panel, the pixel needs to be connected to the drain of the corresponding transistor so that the data signal is provided to the pixel through the transistor. Since this method can make the distance between the pixel and the drain 12 of the connected transistor shorter, it is convenient to connect the circuit of the pixel and the transistor, and it is convenient for the layout and wiring design in the display panel.

[0082] In the embodiments of the present application, Figure 3 and Figure 4 As shown, or as Figure 8 and Fig. 9 As shown, in a direction perpendicular to the plane where the substrate 15 is located, the first source wiring 111 is perpendicularly opposite to the first drain wiring 121, and the second source wiring 112 is perpendicularly opposite to the second drain wiring 122. In this way, the drain wiring in the second metal layer M2 and the source wiring in the third metal layer M3 can be perpendicularly opposite to each other, which is convenient for the alignment design of the metal layer in the display panel, and the layout design of the metal layer in the display panel, which can reduce the process difficulty of manufacturing the display panel.

[0083] refer to Fig.10 , Fig.10 A cross-sectional view of a display panel along the length direction of an active branch provided in an embodiment of the present application, based on the above implementation, Fig.10 In the display panel shown, there is at least one first insulating layer 191 between the second metal layer M2 and the active layer 10 , and at least one second insulating layer 192 between the third metal layer M3 and the active layer 10 ; wherein the thermal conductivity of the first insulating layer 191 is greater than that of the second insulating layer 192 .

[0084] In the embodiment of the present application, the thermal conductivity of the first insulating layer 191 is set to be greater than the thermal conductivity of the second insulating layer 192, so that the heat in the drain terminal 132 can be transferred toward the second metal layer M2 through the first insulating layer 191 with a larger thermal conductivity, so as to quickly conduct the heat in the drain terminal 132 to other areas away from the drain terminal 132 based on the second metal layer M2, avoid heat accumulation at the drain terminal 132, and improve the heat dissipation effect of the drain terminal 132.

[0085] refer to Figure 11-13 , Fig.11 A top view of a transistor in another display panel provided in an embodiment of the present application, Fig.12 for Fig.11 The cross-sectional view of the display panel in the C-C' direction is shown. Fig.13 for Fig.11 The cross-sectional view of the display panel in the D-D' direction is shown. Based on the above implementation, Figure 11-13 In the display panel shown, the gate 14 is located in the first metal layer M1, and the source 11 and the drain 12 are both located in the second metal layer M2; one of the source 11 and the drain 12 includes a first wiring 201 and a second wiring 202 arranged in sequence in the second direction X, and the other is a third wiring 203 located between the first wiring 201 and the second wiring 202; in a direction perpendicular to the plane where the substrate 15 is located, the gate 14 is located between the first wiring 201 and the second wiring 202; each source terminal 131 can be set to be connected to the source 11 through a first conductive hole 161, and each drain terminal 132 can be connected to the drain 12 through a second conductive hole 162.

[0086] like Figure 11-13 As shown, if the source electrode 11 includes a first wiring 201 and a second wiring 202, the source end 131 of the first active branch 171 is connected to the first wiring 201, and the source end 131 of the second active branch 172 is connected to the second wiring 202. Each drain end 132 is connected to the third wiring 203. The source end 131 of the first active branch 171 is connected to the first wiring 201 through the corresponding first conductive via 161. The source 131 of the second active branch 172 is connected to the second wiring 202 through the corresponding first conductive via 161. Each drain end 132 is connected to the third wiring 203 through the corresponding second conductive via 162.

[0087] like Figure 11-13 The method shown can not only make at least two drain terminals 132 located on different sides of the channel region 133 to improve the dispersion of the drain terminals 132 and improve the heat dissipation effect, but also can simultaneously prepare the source 11 and the drain 12 through the same second metal layer M2, which can reduce the panel thickness, simplify the preparation process, and reduce the preparation cost.

[0088] When the source 11 and the drain 12 are simultaneously prepared through the second metal layer M2, the drain 12 can also be set to include the first wiring 201 and the second wiring 202, the drain end 132 of the first active branch 171 is connected to the second wiring 202, and the drain end 132 of the second active branch 172 is connected to the first wiring 201. In this way, each source end 131 is connected to the third wiring 203. This method can also make at least two drain ends 132 located on different sides of the channel region 133 to improve the dispersion of the drain end 132 and improve the heat dissipation effect. The source 11 and the drain 12 can also be simultaneously prepared through the same layer of the second metal layer M2, which can reduce the panel thickness, simplify the preparation process, and reduce the preparation cost.

[0089] If the drain electrode 12 includes the first wiring 201 and the second wiring 202, the structure of the display panel can also be as follows: Figure 14-16 shown.

[0090] refer to Figure 14-16 , Fig.14 A top view of a transistor in another display panel provided in an embodiment of the present application, Fig.15 for Fig.14 The cross-sectional view of the display panel in the E-E' direction is shown. Fig.16 for Fig.14 The cross-sectional view of the display panel in the F-F' direction is shown. Figure 11-13 The difference between the methods shown is that Figure 14-16 In the display panel shown, the drain 12 includes a first wiring 201 and a second wiring 202 , and the source 11 includes a third wiring 203 .

[0091] Figure 14-16 In the manner shown, each drain terminal 132 can be dispersedly arranged in the area corresponding to the first wiring 201 and the second wiring 202. Fig.11 The dispersion of the drain terminals 132 in the third wiring 203 can make the drain terminals 132 dispersed in a larger area, which can improve the dispersion degree of the drain terminals 132 and improve the heat dissipation effect.

[0092] like Fig.11 or Figure 4 As shown, the third line 203 has a plurality of first comb teeth 211 arranged in sequence along the first direction Y on the side facing the first line 201 , and has a plurality of second comb teeth 212 arranged in sequence along the first direction Y on the side facing the second line 202 .

[0093] like Fig.11 As shown, if the drain 12 includes the third wiring 203 , the drain end 132 of the first active branch 171 is connected to the third wiring 203 through the second comb teeth 212 , and the drain end 132 of the second active branch 172 is connected to the third wiring 203 through the first comb teeth 211 .

[0094] like Fig.14 As shown, if the source 11 includes the third wiring 203 , the source end 131 of the first active branch 171 is connected to the third wiring 203 through the first comb teeth 211 , and the source end 131 of the second active branch 172 is connected to the third wiring 203 through the second comb teeth 212 .

[0095] In an embodiment of the present application, a plurality of first comb teeth 211 arranged in sequence and a plurality of second comb teeth 212 arranged in sequence are respectively provided on opposite sides of the third routing 203. Based on the comb tooth structure of the third routing 203, the source terminal 131 and the drain terminal 132 can be connected to the source electrode 11 and the drain electrode 12 of the same layer in a corresponding manner, which can reduce the number of metal layers used in the source and drain electrodes, reduce the panel thickness, simplify the preparation process, and reduce the preparation cost.

[0096] like Fig.11 or Fig.14 As shown, the third trace 203 has a first width d1 in the second direction X; the first comb teeth 211 and the second comb teeth 212 both have a second width d2 in the first direction Y; the active branch 101 has a third width d3 in the first direction Y; optionally, in an implementation of the embodiment of the present application, d1>d3>d2 is set.

[0097] The small current in the first comb teeth 211 and the second comb teeth 212 converge into the third line 203 to form a large current. By setting d1>d3, the first comb teeth 211 and the second comb teeth 212 can have a smaller line width relative to the third line 203, thereby improving the current transmission capacity of the third line 203.

[0098] When the channel width parameter of the active branch 101 is constant, that is, the size of d3 is constant, setting d3>d2 can reduce the area directly facing the first comb teeth 211 and the second comb teeth 212 and the gate 14, so as to reduce the parasitic capacitance between the first comb teeth 211 and the second comb teeth 212 and the gate 14, and reduce the influence of the parasitic capacitance on the transistor performance.

[0099] In one implementation of the embodiment of the present application, the third wiring 203 is located on the side of the gate 14 away from the active layer 10; wherein, in a direction perpendicular to the plane where the substrate 15 is located, the third wiring 203 and the gate 14 have an overlapping portion. Based on the overlapping portion of the third wiring 203 and the gate 14, this method can reduce the layout area of ​​the two on the XY plane, can reduce the size of the transistor, and reduce its impact on the resolution of the display panel.

[0100] In the display panel, an insulating layer 19 is provided between the third wiring 203 and the gate 14. Optionally, the relative dielectric constant of the insulating layer 19 can be set to be less than 3.6, that is, the insulating layer 19 is a low dielectric constant dielectric layer. According to the calculation principle of capacitance, it can be known that the capacitance is positively correlated with the dielectric constant of the medium, so the use of a low dielectric constant dielectric layer as the insulating layer 19 between the third wiring 203 and the gate 14 can reduce the parasitic capacitance between the third wiring 203 and the gate 14, and reduce the influence of the parasitic capacitance on the transistor performance.

[0101] As described above, there is an insulating layer 19 between the third wiring 203 and the gate 14. In one implementation of the embodiment of the present application, the thickness of the insulating layer 19 can be set to be not less than 500nm. According to the calculation principle of capacitance, it can be known that the capacitance is negatively correlated with the distance between the two plates. Setting the thickness of the insulating layer 19 to be not less than 500nm can make the distance between the two plates of the parasitic capacitance larger, which can reduce the parasitic capacitance between the third wiring 203 and the gate 14, and reduce the influence of the parasitic capacitance on the transistor performance.

[0102] As described above, any active branch 101 includes: a source terminal 131, a drain terminal 132, and a channel region 133 located between the source terminal 131 and the drain terminal 132. In one implementation of the embodiment of the present application, the structure of the active branch 101 can be as follows: Fig.17 shown.

[0103] refer to Fig.17 , Fig.17 A top view of an active branch provided in an embodiment of the present application, based on the above implementation, Fig.17 In the illustrated embodiment, along the fourth direction F, the active branch 101 includes a source terminal 131, a channel region 133 and a drain terminal 132 which are sequentially distributed. The fourth direction F is the second direction X or the opposite direction of the second direction X. If the fourth direction F is the second direction X, then Fig.17 The active branch shown is the first active branch 171. If the fourth direction F is the opposite direction of the second direction X, then Fig.17 The active branch shown is the second active branch 172 .

[0104] In the embodiment of the present application, in the display panel, the width of at least one active branch 101 (i.e., the third width d3 mentioned above) is uniform along the fourth direction F, that is, the width of the active branch 101 at any position along the fourth direction F is equal to d3 or approximately equal to d3. In this way, the width of the active branch 101 is uniform, which facilitates the preparation of the active branch 101.

[0105] Optionally, based on the above implementation, in one implementation of the embodiment of the present application, the structures of all active branches 101 may be set as follows: Fig.17As shown, if the widths of all active branches 101 are equal or approximately equal, and the widths of all active branches 101 are uniform and unchanged along the fourth direction F, then all active branches 101 can be uniformly prepared based on the same width, which is convenient for the patterning preparation of the active layer 10, reduces the difficulty of the preparation process of the active layer 10, and further reduces the difficulty of the preparation process of the display panel. In other embodiments, the structures of some active branches 101 in the active layer 10 can also be set as Fig.17 shown.

[0106] refer to Fig.18 , Fig.18 A top view of another active branch provided in an embodiment of the present application, based on the above implementation, Fig.18 In the illustrated method, in the same active branch 101, the source terminal 131 has a first area, and the drain terminal 132 has a second area; wherein the second area is greater than the first area. In this method, along the fourth direction F, the active branch 101 includes the source terminal 131, the channel region 133 and the drain terminal 132 distributed in sequence. The fourth direction F is the second direction X or the opposite direction of the second direction X. If the fourth direction F is the second direction X, then Fig.17 The active branch shown is the first active branch 171. If the fourth direction F is the opposite direction of the second direction X, then Fig.17 The active branch shown is the second active branch 172. In this manner, since the area of ​​the drain terminal 132 is larger than the area of ​​the source terminal 131, the drain terminal 132 can have a larger area to conduct heat, so as to avoid the heat concentration in a small area caused by the small area of ​​the drain terminal 132. The larger area of ​​the drain terminal 132 can also allow the heat to be conducted to the drain electrode 12 faster, so as to avoid the accumulation of heat at the drain terminal 132, thereby improving the heat dissipation effect of the transistor.

[0107] In the embodiment of the present application, in the display panel, at least one active branch 101 is as follows Fig.18 As shown, the area of ​​the drain terminal 132 is larger than the area of ​​the source terminal 131 to improve the heat dissipation effect of the corresponding sub-transistor.

[0108] Optionally, based on the above implementation, in one implementation of the embodiment of the present application, the structures of all active branches 101 may be set as follows: Fig.18 As shown, if the area of ​​the drain terminal 132 of all active branches 101 is larger than the area of ​​the source terminal 131, the sub-transistors corresponding to all active branches 101 have a good heat dissipation effect. In other embodiments, the structures of some active branches 101 in the active layer 10 can also be set as Fig.18 shown.

[0109] In one implementation of the embodiment of the present application, the areas of the source electrode 11 and the drain electrode 12 may be set to be the same or approximately the same. The source electrode 11 and the drain electrode 12 may have the same area ratio, which facilitates the patterning of the metal layer where the source electrode 11 and the drain electrode 12 are located, reduces the difficulty of the patterning process of the metal layer, and reduces the difficulty of the manufacturing process of the display panel.

[0110] When the areas of the source 11 and the drain 12 are the same or approximately the same, if the drain 12 includes a first drain wiring 121 and a second drain wiring 122 sequentially distributed along the second direction X, and the source 11 includes a first source wiring 111 and a second source wiring 112 sequentially distributed along the second direction X, then the sum of the areas of the first drain wiring 121 and the second drain wiring 122 is equal to or approximately equal to the sum of the areas of the first source wiring 111 and the second source wiring 112, and the first drain wiring 121 and the second drain wiring 122 can be set to have the same line width, and have the same or similar line width as the first source wiring 111 and the second source wiring 112. In this way, it is convenient to prepare the metal graphic structure where the source 11 and the drain 12 are located, and the difficulty of the preparation process of the source 11 and the drain 12 can be reduced, and the difficulty of the preparation process of the display panel can be reduced. If

[0111] When the areas of the source 11 and the drain 12 are the same or approximately the same, if one of the source 11 and the drain 12 includes a first routing line 201 and a second routing line 202 arranged in sequence in the second direction X, and the other is a third routing line 203 located between the first routing line 201 and the second routing line 202, then the sum of the areas of the first routing line 201 and the second routing line 202 is equal to or approximately equal to the area of ​​the third routing line 203.

[0112] On the basis of the above-mentioned implementation, in one implementation of the embodiment of the present application, the area of ​​the drain 12 can be set to be larger than the area of ​​the source 11. Since the heat in the transistor is concentrated at the drain terminal 132, at least part of the heat of the drain terminal 132 will be conducted to the drain 12. The metal drain 12 can use the drain 12 as a heat-averaging layer to disperse the heat, avoid heat concentration, and improve the heat dissipation performance of the transistor. In this way, the area of ​​the drain 12 is set to be larger than the area of ​​the source 11, and the larger area of ​​the drain 12 can improve the heat-averaging effect of the drain 12 on the heat, and can disperse the heat in a larger area to avoid heat concentration, which can improve the heat dissipation effect.

[0113] refer to Fig.19 , Fig.19 A partial cross-sectional view of a display panel in the drain region provided in an embodiment of the present application, based on the above implementation, Fig.19In the display panel shown, multiple metal layers are sequentially stacked on the same side surface of the substrate 15, and at least one of the multiple metal layers has a heat-conducting metal portion 22, which is in thermal contact with the drain 12. In this manner, the heat in the drain 12 can be conducted to other areas in the display panel through the heat-conducting metal portion 22, which can prevent heat from accumulating in the drain 12, increase the heat dissipation area, and improve the heat dissipation effect.

[0114] like Fig.19 As shown, the heat conductive metal portion 22 and the drain electrode 12 may be located in different metal layers, with an insulating layer between them. In this case, the heat conductive metal portion 22 may be located on the side of the drain electrode 12 away from the substrate 15, or on the side of the drain electrode 12 facing the substrate 15. The heat conductive metal portion 22 and the drain electrode 12 may be two adjacent metal layers on the substrate 15, or may be two non-adjacent metal layers, which is not limited in the present embodiment of the application. Fig.19 It is a cross-sectional view of a local area of ​​the display panel, which only shows that the drain electrode 12 and the heat-conducting metal portion 22 are arranged on the substrate 15, and the active layer 10 and other metal layers are not shown.

[0115] When the heat-conducting metal part 22 and the drain electrode 12 are located in different metal layers, the two can be in thermal contact with each other through the heat-conducting structure 23. Optionally, the heat-conducting structure 23 can be a through-hole structure filled with a heat-conducting material, wherein the heat-conducting material can be any material such as metal, heat-conducting silicone and graphene.

[0116] In other embodiments, the thermally conductive metal part 22 can also be located in the same metal layer as the drain 12. The thermally conductive metal part 22 and the drain 12 are an integrally formed structure, and the heat in the drain 12 can be conducted to other areas on the same plane through the thermally conductive metal part 22 of the same layer, which can increase the heat dissipation area and improve the heat dissipation efficiency.

[0117] refer to Fig. 20 , Fig. 20 A partial cross-sectional view of another display panel in the drain region provided in an embodiment of the present application, based on the above implementation, Fig. 20 In the display panel shown, the gate 14 is located on the side of the active branch 101 away from the substrate 15, and a light-shielding metal layer 24 is further included between the active layer 10 and the substrate 15, and the light-shielding metal layer 24 is in thermal contact with the drain 12. In this mode, the gate 14 is located on the side of the active branch 101 away from the substrate 15, and the transistor is a top gate structure. In order to prevent the channel region from generating leakage current due to the light incident from the side of the substrate 15, a light-shielding metal layer 24 is provided between the substrate 15 and the active layer 10, and in the third direction Z, the light-shielding metal layer 24 overlaps at least part of the channel region 133, thereby shielding the channel region 133 to reduce the irradiation of the channel region 133 by the light incident from the bottom of the substrate 15.

[0118] like Fig. 20 As shown, a light-shielding metal layer 24 is also provided in the display panel to be in thermal contact with the drain electrode 12. The light-shielding metal layer 24 can be reused as a heat-averaging metal layer to conduct the heat in the drain electrode 12 to other areas of the display panel through the light-shielding metal layer 24 to avoid heat accumulation in the drain electrode 12. At the same time, the heat dissipation area can be increased, and the heat dissipation effect can be improved. Since the light-shielding metal layer 24 and the drain electrode 12 are located in different metal layers, thermal contact can be achieved between the two through the heat-conducting structure 23. As mentioned above, the heat-conducting structure 23 can be a through-hole structure filled with a heat-conducting material.

[0119] When the light shielding metal layer 24 is arranged in thermal contact with the drain electrode 12 to reuse the light shielding metal layer 24 for heat dissipation, the source electrode 11 and the drain electrode 12 may be as follows: Fig. 20 As shown, the source electrode 11 and the drain electrode 12 are respectively prepared by metal layers located on opposite sides of the active layer 10. As in the above-mentioned embodiment, the source electrode 11 and the drain electrode 12 can also be simultaneously prepared based on the same metal layer.

[0120] When other metal layers in the display panel are arranged to be in thermal contact with the drain 12 to reuse other metal layers for heat dissipation, the relative positions of the metal layer where the drain 12 is located and other metal layers in thermal contact with the drain 12 in the display panel can be determined according to the requirements, and the implementation method is not limited to Fig.19 and Fig. 20 The scheme shown can adjust the pattern structure in the metal layer according to the wiring requirements, and realize the thermal contact between the drain 12 and other metal layers under the premise of realizing the connection between the source 11 and the drain 12 in the transistor and the active branch 101.

[0121] refer to Fig.21 , Fig.21 A schematic diagram of the connection principle between an active branch and an active layer in a display panel provided in an embodiment of the present application, Fig.21 FIG. 1 is a top view of an active branch 101 in a display panel. Fig.21 As shown, based on the above embodiment, in the same active branch 101, the source terminal 131 can be connected to the source electrode 11 through the first conductive hole 161, and the drain terminal 132 can be connected to the drain electrode 12 through the second conductive hole 162; wherein the area of ​​the second conductive hole 162 is larger than the area of ​​the first conductive hole 161. In this way, the source terminal 131 can be connected to the source electrode 11 through a first conductive hole 161, and the drain terminal 132 can be connected to the drain electrode 12 through a second conductive hole 162, and the area of ​​the first conductive hole 161 is smaller than the area of ​​the second conductive hole 162.

[0122] exist Fig.21In the manner shown, the area of ​​the second conductive hole 162 is set to be larger than the area of ​​the first conductive hole 161, so that there is a larger thermal contact area between the drain terminal 132 and the drain electrode 12, and the heat in the drain terminal 132 can be quickly conducted to the drain electrode 12. The drain electrode 12 is made of metal material and has a large thermal conductivity coefficient, so that the heat can be conducted to other areas of the display panel more quickly through the drain electrode 12 to improve the heat dissipation performance.

[0123] In other implementations of the embodiments of the present application, the first conductive hole 161 and the second conductive hole 162 may also be set to have the same area, so that the conductive holes in the display panel can be prepared based on the same size parameters to reduce the difficulty of the display panel preparation process.

[0124] refer to Fig. 22 , Fig. 22 A schematic diagram of the connection principle between an active branch and an active layer in another display panel provided in an embodiment of the present application, Fig. 22 FIG. 1 is a top view of an active branch 101 in a display panel. Fig. 22 As shown, on the basis of the above-mentioned embodiment, in the same active branch 101, the source terminal 131 is connected to the source electrode 11 through a first number of first conductive holes 161, and the drain terminal 132 is connected to the drain electrode 12 through a second number of second conductive holes 162; wherein the second number is greater than the first number. The first number is at least one, the second number is at least one, and the second number is greater than the first number. In this manner, the apertures of the first conductive holes 161 and the second conductive holes 162 can be the same, and by setting the second number to be greater than the first number, a larger thermal contact area can be provided between the drain terminal 132 and the drain electrode 12, so that the heat of the drain terminal 132 can be quickly transferred to the drain electrode 12 to prevent the accumulation of heat at the drain terminal 132.

[0125] As described above, in the embodiment of the present application, the width of the active branch 101 in the first direction Y can be uniform and constant, that is, the width of the active branch 101 is uniform and constant along the second direction X, and the widths of the active branch 101 at different positions are the same or approximately the same from the source end 131 to the drain end 132. At this time, at least part or all of the active branches 101 can be set to have uniform widths in the first direction Y, so as to facilitate the process preparation of the active branch 101 and reduce the difficulty of the display panel preparation process.

[0126] refer to Fig.23 , Fig.23 This is a top view of an active layer provided in an embodiment of the present application. Based on the above implementation, the width of the active branch 101 in the first direction Y gradually increases along the direction from the source end 131 to the drain end 132. In this way, it can be as follows Fig.23As shown, in all active branches, the width of the active branch 101 in the first direction Y gradually increases along the direction from the source end 131 to the drain end 132; it can also be arranged that in at least part of the active branches of the active layer 10, the width of the active branch 101 in the first direction Y gradually increases.

[0127] exist Fig.23 In the embodiment, the width of the active branch 101 in the first direction Y is gradually increased along the direction from the source end 131 to the drain end 132, so that the drain end of the active branch 101 has a larger area, so as to achieve a heat distribution effect through a larger area to prevent heat from accumulating in a small area. Moreover, the larger area of ​​the drain end 132 can also make the drain end 132 have a larger heat conduction area, which is convenient for faster heat conduction from the drain end 132 along the third direction Z and the opposite direction of the third direction, so that the heat can be transferred to other film layers of the display panel faster, thereby improving the heat dissipation effect.

[0128] Based on the display panel provided in the above embodiment, another embodiment of the present application further provides a display device, the structure of the display device is as follows: Fig.24 shown.

[0129] refer to Fig.24 , Fig.24 This is a schematic diagram of the structure of a display device provided in an embodiment of the present application. The display device shown includes a display panel 25. The display panel 25 can be a display panel provided in any implementation manner of the above embodiments.

[0130] In the embodiment of the present application, the display device adopts the display panel 25 provided in the above embodiment, which can improve the heat dissipation effect of the transistors in the display panel, and further improve the image display effect.

[0131] Optionally, the display device includes but is not limited to electronic devices with display function such as mobile phones, tablet computers, laptop computers, and smart wearable devices.

[0132] In the specification of this application, each embodiment is described in a progressive, parallel, or progressive and parallel manner, and each embodiment focuses on the differences from other embodiments, and the same or similar parts between the embodiments can be referred to each other. The embodiments provided in the embodiments of this application can be combined with each other if there is no contradiction.

[0133] It should be noted that in the description of the present application, it should be understood that the description of the drawings and embodiments is illustrative rather than restrictive. The same reference numerals throughout the embodiments of the specification identify the same structure. In addition, for the sake of understanding and ease of description, the drawings may exaggerate the thickness of some layers, films, panels, regions, etc. It is also understood that when an element such as a layer, film, region, or substrate is referred to as "on" another element, the element may be directly on the other element or there may be an intermediate element. In addition, "on" refers to positioning an element on or below another element, but does not essentially refer to positioning on the upper side of another element according to the direction of gravity.

[0134] The terms "upper", "lower", "top", "bottom", "inner", "outer", etc. indicate positions or positional relationships based on the positions or positional relationships shown in the drawings, and are only for the convenience of describing the present application and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the present application. When a component is considered to be "connected" to another component, it may be directly connected to the other component or there may be a centrally arranged component at the same time.

[0135] It should also be noted that, in this article, relational terms such as first and second, etc. are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "comprises", "comprising" or any other variants thereof are intended to cover non-exclusive inclusion, so that an article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such article or device. In the absence of further restrictions, the elements defined by the sentence "comprising a ..." do not exclude the existence of other identical elements in the article or device including the above elements.

[0136] The above description of the disclosed embodiments enables those skilled in the art to implement or use the present application. Various modifications to these embodiments will be apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the present application. Therefore, the present application will not be limited to the embodiments shown herein, but will conform to the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A display panel, characterized in that: include: substrate; An active layer located on the surface of the substrate; The active layer includes a plurality of active branches arranged in sequence in a first direction, and the active branches extend along a second direction; the first direction and the second direction intersect and are both parallel to the plane where the substrate is located; the active branches include a source terminal, a drain terminal, and a channel region located between the source terminal and the drain terminal; the source terminal is connected to a source electrode, and the drain terminal is connected to a drain electrode; A gate extending along the second direction; in a direction perpendicular to the plane where the substrate is located, the gate and the channel region of the active branch have overlapping portions; Among them, the multiple active branches include at least a first active branch and a second active branch, the direction from the source end to the drain end of the first active branch is the second direction, and the direction from the source end to the drain end of the second active branch is the opposite direction of the second direction.

2. The display panel according to claim 1, characterized in that: In the first direction, the plurality of active branches include: A first active branch group and a second active branch group arranged in sequence; Or, a first active branch group and a second active branch group are arranged alternately; The first active branch group includes at least one of the first active branches, and the second active branch group includes at least one of the second active branches.

3. The display panel according to claim 2, characterized in that: The first active branch group includes one first active branch, and the second active branch group includes one second active branch.

4. The display panel according to claim 1, characterized in that: The gate is located at a first metal layer, the drain is located at a second metal layer, the source is located at a third metal layer, and the active layer is located between the second metal layer and the third metal layer; The drain electrode includes a first drain wiring and a second drain wiring sequentially distributed along the second direction, and the source electrode includes a first source wiring and a second source wiring sequentially distributed along the second direction; In a direction perpendicular to the plane where the substrate is located, the gate is located between the first drain wiring and the second drain wiring, and between the first source wiring and the second source wiring; Among them, in the first active branch, the source end is connected to the first source wiring, and the drain end is connected to the second drain wiring; in the second active branch, the source end is connected to the second source wiring, and the drain end is connected to the first drain wiring.

5. The display panel according to claim 4, characterized in that: The first metal layer is located between the third metal layer and the active layer.

6. The display panel according to claim 4, characterized in that: The second metal layer is located between the substrate and the active layer.

7. The display panel according to claim 4, characterized in that: The second metal layer is located on a side of the active layer facing away from the substrate.

8. The display panel according to claim 4, characterized in that: In a direction perpendicular to the plane where the substrate is located, the first source wiring is perpendicular to the first drain wiring, and the second source wiring is perpendicular to the second drain wiring.

9. The display panel according to claim 4, characterized in that: There is at least one first insulating layer between the second metal layer and the active layer, and there is at least one second insulating layer between the third metal layer and the active layer; Wherein, the thermal conductivity of the first insulating layer is greater than the thermal conductivity of the second insulating layer.

10. The display panel according to claim 1, characterized in that: The gate is located in the first metal layer, and the source and the drain are both located in the second metal layer; One of the source and the drain includes a first routing line and a second routing line arranged in sequence in the second direction, and the other is a third routing line located between the first routing line and the second routing line; In a direction perpendicular to the plane where the substrate is located, the gate is located between the first wiring and the second wiring; If the source electrode includes the first wiring and the second wiring, the source end of the first active branch is connected to the first wiring, and the source end of the second active branch is connected to the second wiring; If the drain includes the first routing line and the second routing line, the drain end of the first active branch is connected to the second routing line, and the drain end of the second active branch is connected to the first routing line.

11. The display panel according to claim 10, characterized in that: The drain includes the first wiring and the second wiring, and the source includes the third wiring.

12. The display panel according to claim 10, characterized in that: The third line has a plurality of first comb teeth arranged in sequence along the first direction on one side facing the first line, and has a plurality of second comb teeth arranged in sequence along the first direction on one side facing the second line; If the drain electrode includes the third wiring, the drain end of the first active branch is connected to the third wiring through the second comb teeth, and the drain end of the second active branch is connected to the third wiring through the first comb teeth; If the source electrode includes the third wiring, the source end of the first active branch is connected to the third wiring through the first comb teeth, and the source end of the second active branch is connected to the third wiring through the second comb teeth.

13. The display panel according to claim 12, characterized in that: The third trace has a first width d1 in the second direction; The first comb teeth and the second comb teeth both have a second width d2 in the first direction; The active branch has a third width d3 in the first direction; Among them, d1>d3>d2.

14. The display panel according to claim 10, characterized in that: The third wiring is located at a side of the gate away from the active layer; Wherein, in a direction perpendicular to the plane where the substrate is located, the third wiring and the gate have an overlapping portion.

15. The display panel according to claim 13, characterized in that: An insulating layer is provided between the third wiring and the gate, and the relative dielectric constant of the insulating layer is less than 3.

6.

16. The display panel according to claim 13, characterized in that: An insulating layer is provided between the third wiring and the gate, and the thickness of the insulating layer is not less than 500 nm.

17. The display panel according to claim 1, characterized in that: In the same active branch, the source end has a first area, and the drain end has a second area; Wherein, the second area is larger than the first area.

18. The display panel according to claim 1, characterized in that: An area of ​​the drain electrode is larger than an area of ​​the source electrode.

19. The display panel according to claim 1, characterized in that: A plurality of metal layers are sequentially stacked on the same side surface of the substrate, at least one of the plurality of metal layers has a heat conductive metal portion, and the heat conductive metal portion is in thermal contact with the drain electrode.

20. The display panel according to claim 1, characterized in that: The gate is located at a side of the active branch away from the substrate, and a light-shielding metal layer is further provided between the active layer and the substrate, and the light-shielding metal layer is in thermal contact with the drain.

21. The display panel according to claim 1, characterized in that: In the same active branch, the source end is connected to the source electrode through a first conductive hole, and the drain end is connected to the drain electrode through a second conductive hole; The area of ​​the second conductive hole is greater than the area of ​​the first conductive hole.

22. The display panel according to claim 1, characterized in that: In the same active branch, the source end is connected to the source electrode through a first number of first conductive vias, and the drain end is connected to the drain electrode through a second number of second conductive vias; Wherein, the second number is greater than the first number.

23. The display panel according to claim 1, characterized in that: Along the second direction, the width of the active branch in the first direction is uniform and unchanged; Alternatively, along the direction from the source end to the drain end, the width of the active branch in the first direction gradually increases.

24. A display device, characterized in that: include: A display panel as claimed in any one of claims 1 to 23.

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