Display panel and display device

Abstract

The application discloses a display panel and a display device, and relates to the technical field of display devices. The display panel comprises a substrate, an active layer located on the surface of the substrate, the active layer comprising a plurality of active branches arranged in sequence in a first direction, the active branches extending along a second direction, the first direction and the second direction being perpendicular and parallel to the plane where the substrate is located, the active branch comprising a source end, a drain end and a channel region between the source end and the drain end, the source end being connected to a source electrode and the drain end being connected to a drain electrode, a gate electrode extending along the second direction, the gate electrode and the channel region of the active branch both having an overlapping part in the direction perpendicular to the plane where the substrate is located, wherein the plurality of active branches comprises at least one first active branch and one second active branch, the direction from the source end to the drain end of the first active branch being the second direction, and the direction from the source end to the drain end of the second active branch being the opposite direction of the second direction. The technical scheme can improve the heat dissipation effect of the transistor.

Description

Technical Field

[0001] This application relates to the field of display device technology, and more particularly to a display panel and a display device. Background Technology

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

[0003] The pixels in a display panel require pixel circuitry for image display control. Pixel circuitry consists of multiple interconnected transistors. In existing transistors, to improve driving capability, the channel size needs to be increased to increase the transistor's output current. However, a larger output current leads to the generation of a significant amount of heat during transistor operation, which can negatively impact transistor performance. Summary of the Invention

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

[0005] The first aspect of this application provides a display panel, including:

[0006] Base;

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

[0008] The gate extends along a second direction; in a direction perpendicular to the plane of the substrate, the gate and the channel region of the active branch both overlap.

[0009] Among them, the multiple active branches include at least one first active branch and one 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 this application provides a display device including the aforementioned display panel.

[0011] By means of the above technical solution, the display panel and display device provided in this application are provided with an active layer including a plurality of active branches arranged sequentially in a first direction. Each active branch includes a source end, a drain end and a channel region located between the source end and the drain end. If each active branch can form a sub-transistor, a transistor can be divided into multiple sub-transistors, which can reduce the self-heating of the transistor, reduce the heat generated when the transistor is working, avoid the performance of the transistor due to excessive heat, and improve the image display quality.

[0012] In addition, the active layer includes multiple active branches, including a first active branch and a second active branch. Since the source-to-drain directions in the first and second active branches are opposite and parallel to the second direction, the drains of at least two sub-transistors can be located on different sides of the channel region in the second direction. This avoids the heat concentration problem caused by the drains of all sub-transistors being concentrated on the same side, facilitates heat dissipation of the transistors, prevents excessive heat from affecting the performance of the transistors, and improves the image display quality. Attached Figure Description

[0013] To more clearly illustrate the technical solutions in the embodiments of this application or related technologies, the drawings used in the description of the embodiments or prior art will be briefly introduced below. Obviously, the drawings described below are only embodiments of this application. For those skilled in the art, other drawings can be obtained based on the provided drawings without creative effort.

[0014] The structures, proportions, sizes, etc., shown in the accompanying drawings are only for the purpose of assisting those skilled in the art in understanding and reading the content disclosed in the specification, and are not intended to limit the implementation conditions of this application. Therefore, they have no substantial technical significance. Any modifications to the structure, changes in the proportions, or adjustments to the size, without affecting the effects and purposes that this application can produce, should still fall within the scope of the technical content disclosed in this application.

[0015] Figure 1 This is a schematic diagram of the structure of a display panel;

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

[0017] Figure 3 for Figure 2 The image shows a cross-sectional view of the display panel along the A-A' direction;

[0018] Figure 4 for Figure 2 The image shows a cross-sectional view of the display panel along the B-B' direction;

[0019] Figure 5 This is a top view of an active layer in an embodiment of this application;

[0020] Figure 6 This is a top view of another active layer in an embodiment of this application;

[0021] Figure 7 This is a top view of yet another active layer in the embodiments of this application;

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

[0023] Figure 9 A cross-sectional view of a display panel along the extension direction of a second active branch, provided for an embodiment of this application;

[0024] Figure 10 A cross-sectional view of a display panel along the length direction of an active branch, provided for an embodiment of this application;

[0025] Figure 11 A top view of a transistor in another display panel provided in an embodiment of this application;

[0026] Figure 12 for Figure 11 The image shows a cross-sectional view of the display panel along the C-C' direction;

[0027] Figure 13 for Figure 11 The image shows a cross-sectional view of the display panel along the D-D' direction;

[0028] Figure 14 A top view of a transistor in another display panel provided in an embodiment of this application;

[0029] Figure 15 for Figure 14 The image shows a cross-sectional view of the display panel along the E-E' direction;

[0030] Figure 16 for Figure 14 The image shows a cross-sectional view of the display panel along the F-F' direction;

[0031] Figure 17 A top view of an active branch provided in an embodiment of this application;

[0032] Figure 18 A top view of another active branch provided in an embodiment of this application;

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

[0034] Figure 20 A partial cross-sectional view of the drain region of another display panel provided in an embodiment of this application;

[0035] Figure 21 A schematic diagram illustrating the connection principle between an active branch and an active layer in a display panel, provided in an embodiment of this application;

[0036] Figure 22 A schematic diagram illustrating the connection principle between an active branch and an active layer in another display panel provided in this application embodiment;

[0037] Figure 23 A top view of an active layer provided in an embodiment of this application;

[0038] Figure 24 This is a schematic diagram of the structure of a display device provided in an embodiment of this application.

[0039] Figure label:

[0040] 10-Active layer; 101-Active branch; 11-Source; 111-First source trace; 112-Second source trace; 12-Drain; 121-First drain trace; 122-Second drain trace; 131-Source terminal; 132-Drain terminal; 133-Channel region; 14-Gate; 15-Substrate; 161-First conductive via; 162-Second conductive via; 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 trace; 202- Second trace; 203- Third trace; 211- First comb tooth; 212- Second comb tooth; 22- Thermally conductive metal part; 23- Thermally 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 Implementation

[0041] The embodiments of this application will now be clearly and completely described with reference to the accompanying drawings. Those skilled in the art will recognize that, with technological advancements and the emergence of new scenarios, the technical solutions provided in the embodiments of this application are equally applicable to similar technical problems.

[0042] Transistors can increase their output current and thus their driving capability by increasing their size. However, a larger driving current leads to greater heat generation during operation. If this heat is not dissipated effectively, it will affect the transistor's switching speed, power consumption, and efficiency. To reduce transistor heat generation, methods such as... Figure 1As shown, the transistor is divided into multiple sub-transistors.

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

[0044] The active layer 10 includes a plurality of active branches 101 arranged sequentially along the first direction Y; the active branches include source terminals 131, channel regions 133 and drain terminals 132 arranged sequentially along the second direction X.

[0045] The source 11 is located on the active layer 10 and is connected to the source end 131 of each active branch 101.

[0046] The drain 12 is located on the active layer 10 and is connected to the drain terminal 132 of each active branch 101.

[0047] The gate 14 located on the active layer 10 has an overlap with the channel region 133 of each active branch 101.

[0048] exist Figure 1 In the illustrated method, the active layer 10 of a transistor is divided into multiple active branches 101, and each active branch 101 can form a sub-transistor. This allows a transistor to be divided into multiple sub-transistors, which can disperse the high-temperature region of the transistor, thereby facilitating the dissipation of heat in the transistor and improving the heat dissipation effect.

[0049] While dividing a transistor into multiple sub-transistors can improve heat dissipation to some extent, the current in the transistor flows from the source terminal 131 to the drain terminal 132, which serves as the current output terminal. This causes heat to concentrate at the drain terminal 132. Figure 1 In the configuration shown, all drain terminals 132 are located on the same side of the channel region 133, which causes the heat of all sub-transistors to concentrate on the same side, making it difficult for the transistors to dissipate heat, affecting the transistors' performance, and consequently affecting the image display quality.

[0050] To address the aforementioned problems, this application provides a display panel, including:

[0051] Base;

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

[0053] The gate extends along a second direction; in a direction perpendicular to the plane of the substrate, the gate and the channel region of the active branch both overlap.

[0054] Among them, the multiple active branches include at least one first active branch and one 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 this embodiment, the active layer is divided into multiple active branches, and each active branch can form a sub-transistor. This can reduce the self-heating of the transistor, reduce the heat generated when the transistor is working, and avoid the transistor's performance being affected by excessive heat.

[0056] Furthermore, the active layer includes multiple active branches, including a first active branch and a second active branch. Since the source-to-drain directions in the first and second active branches are opposite and parallel to the second direction, the drains of at least two sub-transistors can be located on different sides of the channel region in the second direction. This avoids the heat concentration problem caused by the drains of all sub-transistors being concentrated on the same side, facilitates heat dissipation of the transistors, prevents excessive heat from affecting the performance of the transistors, and improves the image display quality.

[0057] To make the above-mentioned objectives, features and advantages of this application more apparent and understandable, the application will be further described in detail below with reference to the accompanying drawings and specific embodiments.

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

[0059] Base 15;

[0060] An active layer 10 is located on the surface of a substrate 15. The active layer 10 includes a plurality of active branches 101 arranged sequentially 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 of the substrate 15. The active branches 101 include a source end 131, a drain end 132, and a channel region 133 located between the source end 131 and the drain end 132. The source end 131 is connected to the source electrode 11, and the drain end 132 is connected to the drain electrode 12.

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

[0062] Among them, the multiple active branches 101 include at least one first active branch 171 and one 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 and the second direction X are perpendicular. The direction perpendicular to the plane containing the base 15 is defined as the third direction Z. The third direction Z is perpendicular to the first direction Y and the second direction X.

[0064] In this embodiment, the active layer 10 of a transistor is divided into multiple active branches 101. Based on the multiple active branches 101, a large-sized transistor can be divided into multiple small-sized sub-transistors, with each active branch 101 forming one sub-transistor. Dividing a large-sized transistor into multiple small-sized sub-transistors can reduce the self-heating of the transistor, reduce the heat generated during transistor operation, and avoid affecting the performance of the transistor due to excessive heat.

[0065] Furthermore, 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 both 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. This disperses the drain ends 132 of at least two active branches 101 on different sides of the channel region 133, 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 this application. Based on the above implementation, 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 sequentially; 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 configuration, 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 configuration, along the first direction Y, the multiple active branches 101 in the active layer 10 are divided into two groups, which are respectively designated 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 designated as first active branches 171, and the active branches 101 in the second active branch group 182 are designated as second active branches 172. This configuration ensures that the drain ends of the active branches 101 in the first active branch group 181 are all located on the side of the channel region 133 facing the second direction X, and that the drain ends of the active branches 101 in the second active branch group 182 are all located on the side of the channel region 133 away from the second direction X. This avoids the drain ends 132 of the active branches 101 concentrating on the same side of the channel region 133, improving the dispersion of the drain ends 132 and thus enhancing the heat dissipation effect.

[0068] refer to Figure 6 , Figure 6 This is a top view of another active layer in an embodiment of this application. Based on the above implementation, in the first direction Y, the plurality of active branches 101 include: alternating first active branch groups 181 and second active branch groups 182. In this method, the plurality of active branches 101 in the active layer 10 are divided into at least three groups. In any two adjacent groups, one is the first active branch group 181 and the other is the second active branch group 182, relative to... Figure 5 The method shown can further improve the dispersion of the drain end 132, thereby further improving the heat dissipation effect.

[0069] When the active layer 10 includes a first active branch group 181 and a second active branch group 182, both the first active branch group 181 and the second active branch group 182 can be configured to include an active branch. The distribution of the first active branch 171 and the second active branch 172 in the active layer 10 is as follows: Figure 7 As shown

[0070] refer to Figure 7 , Figure 7 This is a top view of another active layer in this application embodiment. Based on the above implementation, both the first active branch group 181 and the second active branch group 182 include an active branch. Thus, on the same side of the channel region 133, along the first direction Y, the source end 131 and drain end 132 of each active branch 101 are alternately arranged. Figure 8 In the channel region 133, on the left side along the first direction Y, the source ends 131 and drain ends 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 ends 131 and drain ends 132 of each active branch 101 are arranged alternately. This arrangement can maximize the dispersion of the drain ends 132, thus improving the heat dissipation effect.

[0071] exist Figures 2-4In the illustrated configuration, taking the alternating arrangement of the first active branch 171 and the second active branch 172 along the first direction Y as an example, the distribution of the active branch 101 in the active layer 10 can be as follows: Figure 7 As 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 the requirements, such as 2, 3 or more. This application embodiment does not limit the number of active branches 101 in the active layer 10.

[0073] In one embodiment of this application, it can be as follows: Figures 2-4 As shown, gate 14 is located in the first metal layer M1, drain 12 is located in the second metal layer M2, source 11 is located in the third metal layer M3, and active layer 10 is located between the second metal layer M2 and the third metal layer M3; drain 12 includes a first drain line 121 and a second drain line 122 sequentially distributed along the second direction X, and source 11 includes a first source line 111 and a second source line 112 sequentially distributed along the second direction X; in the direction perpendicular to the plane of the substrate, gate 14 is located between the first drain line 121 and the second drain line 122, and between the first source line 111 and the second source line 112; wherein, in the first active branch 171, source end 131 is connected to the first source line 111, and drain end 132 is connected to the second drain line 122; in the second active branch 172, source end 131 is connected to the second source line 112, and drain end 132 is connected to the first drain line 121.

[0074] exist Figures 2-4 As shown, source 11 and drain 12 are fabricated using two metal layers, with source 11 and drain 12 located on opposite sides of active layer 10. Source 11 and drain 12 each have two traces, ensuring that even when the drain ends 132 of at least two active branches 101 are located on different sides of channel region 133, the source ends 131 of each active branch 101 are connected to source 11, and the drain ends 132 of each active branch 101 are connected to drain 12. This improves the dispersion of drain ends 132 while facilitating the corresponding connection between the active drain ends and source / drain electrodes in each sub-transistor.

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

[0076] In this embodiment, the first metal layer M1 can be located between the second metal layer M2 and the active layer 10. In this configuration, the first metal layer M1 and the insulating layer 19 covering its surface will increase the vertical distance between the drain terminal 132 and the drain electrode 12, thereby increasing the heat transfer distance from the drain terminal 132 to the drain electrode 12, making it difficult for heat to be conducted from the drain terminal 132 to the drain electrode 12 in a timely manner.

[0077] In order to enable the heat in the drain terminal 132 to be quickly conducted to the drain electrode 12, in one embodiment of this application, such as Figure 3 and Figure 4 As shown, the first metal layer M1 is positioned between the third metal layer M3 and the active layer 10. This avoids increasing the heat transfer distance from the drain end 132 to the drain electrode 12 due to the first metal layer M1 and the insulating layer 19 covering its surface. It allows heat to be quickly conducted from the drain end 132 to the drain electrode 12, so that it can be quickly dissipated to other areas through the drain electrode 12, thereby improving heat dissipation efficiency.

[0078] In one embodiment of this application, such as 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 transistors formed by the source / drain electrodes and the active layer, structures such as pixels and cover plates for the display panel need to be disposed, which can affect the upward conduction of heat. In this method, positioning the second metal layer M2 on the side of the active layer 10 facing the substrate 15 allows the drain 12 to be closer to the bottom of the substrate 15, shortening the heat conduction path downwards from the substrate 15. This allows more heat to be conducted towards the drain 12, and also allows heat conducted from the drain terminal 132 to the drain 12 to be quickly dissipated through the bottom of the substrate 15 to the outside of the display panel, improving 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, and the source 11 is located in the third metal layer M3, and the drain 12 includes a first drain line 121 and a second drain line 122 distributed sequentially along the second direction X, and the source 11 includes a first source line 111 and a second source line 112 distributed sequentially along the second direction X, the source end 131 can be connected to the source 11 through the first conductive hole 161, and the drain end 132 can be connected to the drain 12 through the second conductive hole 162.

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

[0081] Based on the above implementation methods, Figure 8 and Figure 9 In the display panel shown, the second metal layer M2 is located on the side of the active layer 10 facing away from the substrate 15. This arrangement allows the drain 12 to be closer to the pixel positioned above it, shortening the distance between the drain 12 and the pixel. In the display panel, pixels need to be connected to the drain of the corresponding transistor to provide data signals to the pixel. Because this arrangement allows for a shorter distance between the pixel and the drain 12 of the connected transistor, it facilitates the circuit connection between the pixel and the transistor, simplifying the layout and wiring design of the display panel.

[0082] In the embodiments of this application, such as Figure 3 and Figure 4 As shown, or as Figure 8 and Figure 9 As shown, in a direction perpendicular to the plane of the substrate 15, the first source trace 111 is perpendicularly opposite to the first drain trace 121, and the second source trace 112 is perpendicularly opposite to the second drain trace 122. This allows the drain trace in the second metal layer M2 and the source trace in the third metal layer M3 to be perpendicularly opposite, facilitating the alignment and layout design of the metal layers in the display panel and reducing the manufacturing difficulty of the display panel.

[0083] refer to Figure 10 , Figure 10 A cross-sectional view of a display panel along the length direction of an active branch, provided in an embodiment of this application, is based on the above-described implementation. Figure 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 this embodiment, the thermal conductivity of the first insulating layer 191 is set to be greater than that of the second insulating layer 192. This allows the heat in the drain terminal 132 to be transferred towards the second metal layer M2 through the first insulating layer 191, which has a higher thermal conductivity. This facilitates the rapid conduction of the heat in the drain terminal 132 to other areas away from the drain terminal 132 based on the second metal layer M2, thus avoiding the accumulation of heat in the drain terminal 132 and improving the heat dissipation effect of the drain terminal 132.

[0085] refer to Figures 11-13 , Figure 11 A top view of a transistor in another display panel provided in an embodiment of this application. Figure 12 for Figure 11 The image shows a cross-sectional view of the display panel along the C-C' direction. Figure 13 for Figure 11 The diagram shows a cross-sectional view of the display panel along the D-D' direction. Based on the above embodiment, Figures 11-13 In the display panel shown, the gate 14 is located in the first metal layer M1, and the source 11 and drain 12 are both located in the second metal layer M2. One of the source 11 and drain 12 includes a first trace 201 and a second trace 202 arranged sequentially in the second direction X, and the other is a third trace 203 located between the first trace 201 and the second trace 202. In the direction perpendicular to the plane of the substrate 15, the gate 14 is located between the first trace 201 and the second trace 202. Each source terminal 131 can 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 Figures 11-13 As shown, if the source 11 includes a first trace 201 and a second trace 202, the source end 131 of the first active branch 171 is connected to the first trace 201, and the source end 131 of the second active branch 172 is connected to the second trace 202. Each drain end 132 is connected to a third trace 203. The source end 131 of the first active branch 171 is connected to the first trace 201 through a corresponding first conductive via 161. The source end 131 of the second active branch 172 is connected to the second trace 202 through a corresponding first conductive via 161. Each drain end 132 is connected to the third trace 203 through a corresponding second conductive via 162.

[0087] like Figures 11-13 The method shown not only allows at least two drain terminals 132 to be located on different sides of the channel region 133, thereby improving the dispersion of the drain terminals 132 and enhancing the heat dissipation effect, but also allows the source electrode 11 and drain electrode 12 to be fabricated simultaneously through the same second metal layer M2, which can reduce the panel thickness, simplify the fabrication process, and reduce the fabrication cost.

[0088] When the source electrode 11 and drain electrode 12 are simultaneously fabricated through the second metal layer M2, the drain electrode 12 can also be configured to include a first trace 201 and a second trace 202. The drain end 132 of the first active branch 171 is connected to the second trace 202, and the drain end 132 of the second active branch 172 is connected to the first trace 201. In this method, each source end 131 is connected to the third trace 203. This method also allows at least two drain ends 132 to be located on different sides of the channel region 133, thereby improving the dispersion of the drain ends 132 and enhancing heat dissipation. Furthermore, the source electrode 11 and drain electrode 12 can be simultaneously fabricated through the same second metal layer M2, which can reduce panel thickness, simplify the fabrication process, and lower fabrication costs.

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

[0090] refer to Figures 14-16 , Figure 14 A top view of a transistor in another display panel provided in an embodiment of this application. Figure 15 for Figure 14 The image shows a cross-sectional view of the display panel along the E-E' direction. Figure 16 for Figure 14 The image shows a cross-sectional view of the display panel along the F-F' direction. (Compared to...) Figures 11-13 The difference is that, Figures 14-16 In the display panel shown, the drain 12 includes a first trace 201 and a second trace 202, and the source 11 includes a third trace 203.

[0091] Figures 14-16 In the illustrated configuration, each drain terminal 132 can be distributed within the area corresponding to the first trace 201 and the second trace 202, relative to... Figure 11 The way the drain terminals 132 are distributed in the third trace 203 allows the drain terminals 132 to be distributed in a larger area, which can improve the degree of dispersion of the drain terminals 132 and thus improve the heat dissipation effect.

[0092] like Figure 11 or Figure 4 As shown, the third routing 203 has multiple first comb teeth 211 arranged sequentially along the first direction Y on the side facing the first routing 201, and multiple second comb teeth 212 arranged sequentially along the first direction Y on the side facing the second routing 202.

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

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

[0095] In this embodiment, multiple first comb teeth 211 and multiple second comb teeth 212 arranged in sequence are respectively provided on the opposite sides of the third trace 203. Based on the comb tooth structure, the third trace 203 can realize the corresponding connection between the source end 131 and the drain end 132 and the source electrode 11 and drain electrode 12 in the same layer, which can reduce the number of metal layers used for the source and drain electrodes, reduce the panel thickness, simplify the manufacturing process, and reduce the manufacturing cost.

[0096] like Figure 11 or Figure 14 As shown, the third trace 203 has a first width d1 in the second direction X; the first comb tooth 211 and the second comb tooth 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 one embodiment of the present application, d1 > d3 > d2 is set.

[0097] The small currents in the first comb teeth 211 and the second comb teeth 212 converge into the third trace 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 trace 203, which can improve the current transmission capability of the third trace 203.

[0098] With the channel width parameter of the active branch 101 fixed, i.e. the size of d3 is fixed, setting d3 > d2 can reduce the area of ​​the first comb tooth 211 and the second comb tooth 212 facing the gate 14, thereby reducing the parasitic capacitance between the first comb tooth 211 and the second comb tooth 212 and the gate 14, and reducing the impact of parasitic capacitance on transistor performance.

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

[0100] In the display panel, an insulating layer 19 is provided between the third trace 203 and the gate 14. Optionally, the relative permittivity 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 principle of capacitance calculation, capacitance is positively correlated with the dielectric constant of the dielectric. Therefore, using a low-dielectric-constant dielectric layer as the insulating layer 19 between the third trace 203 and the gate 14 can reduce the parasitic capacitance between the third trace 203 and the gate 14, thereby reducing the impact of parasitic capacitance on transistor performance.

[0101] As described above, an insulating layer 19 exists between the third trace 203 and the gate 14. In one embodiment of this application, the thickness of the insulating layer 19 can be set to be not less than 500 nm. According to the principle of capacitance calculation, 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 500 nm can make the distance between the two plates of the parasitic capacitance larger, which can reduce the parasitic capacitance between the third trace 203 and the gate 14, and reduce the impact of parasitic capacitance on transistor performance.

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

[0103] refer to Figure 17 , Figure 17 This application provides a top view of an active branch in an embodiment of the present application, based on the above-described implementation. Figure 17 In the illustrated configuration, along the fourth direction F, the active branch 101 includes a source end 131, a channel region 133, and a drain end 132, which are sequentially distributed. The fourth direction F is either the second direction X or the opposite direction of the second direction X. If the fourth direction F is the second direction X, then... Figure 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... Figure 17 The active branch shown is the second active branch 172.

[0104] In this embodiment of the application, in the display panel, the width of at least one active branch 101 (i.e., the third width d3 mentioned above) remains uniformly constant along the fourth direction F. That is, the width of the active branch 101 at any position in the fourth direction F is equal to or approximately equal to d3. As such, the width of the active branch 101 remains uniformly constant, which facilitates the fabrication of the active branch 101.

[0105] Optionally, based on the above embodiments, in one embodiment of this application, the structure of all active branches 101 can be set as follows: Figure 17As shown, if the widths of all active branches 101 are equal or approximately equal, and the widths of all active branches 101 are uniformly constant along the fourth direction F, then all active branches 101 can be fabricated uniformly based on the same width. This facilitates the patterned fabrication of the active layer 10, reduces the fabrication process difficulty of the active layer 10, and consequently reduces the fabrication process difficulty of the display panel. In other embodiments, the structure of some active branches 101 in the active layer 10 can also be set as follows. Figure 17 As shown.

[0106] refer to Figure 18 , Figure 18 This is a top view of another active branch provided in an embodiment of this application, based on the above-described implementation. Figure 18 In the illustrated configuration, within the same active branch 101, the source end 131 has a first area, and the drain end 132 has a second area; wherein the second area is larger than the first area. In this configuration, along the fourth direction F, the active branch 101 includes a source end 131, a channel region 133, and a drain end 132 distributed sequentially. The fourth direction F is either the second direction X or the opposite direction of the second direction X. If the fourth direction F is the second direction X, then... Figure 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... Figure 17 The active branch shown is the second active branch 172. In this method, since the area of ​​the drain 132 is larger than the area of ​​the source 131, the drain 132 can have a larger area to conduct heat, thus avoiding the heat concentration in a small area caused by the small area of ​​the drain 132. The larger area of ​​the drain 132 also allows heat to be conducted to the drain electrode 12 more quickly, avoiding heat accumulation at the drain 132, thereby improving the heat dissipation effect of the transistor.

[0107] In this embodiment of the application, at least one active branch 101 in the display panel is as follows: Figure 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 of the corresponding sub-transistor.

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

[0109] In one embodiment of this application, the source electrode 11 and the drain electrode 12 can be set to have the same or approximately the same area. This allows the source electrode 11 and the drain electrode 12 to have the same area ratio, which facilitates the patterning fabrication of the metal layer containing the source electrode 11 and the drain electrode 12, reduces the difficulty of the patterning process of the metal layer, and reduces the difficulty of the fabrication process of the display panel.

[0110] When the areas of the source 11 and drain 12 are the same or approximately the same, if the drain 12 includes a first drain line 121 and a second drain line 122 sequentially distributed along the second direction X, and the source 11 includes a first source line 111 and a second source line 112 sequentially distributed along the second direction X, then the sum of the areas of the first drain line 121 and the second drain line 122 is equal to or approximately equal to the sum of the areas of the first source line 111 and the second source line 112. Therefore, the first drain line 121 and the second drain line 122 can be configured to have the same linewidth, and the same or similar linewidth to the first source line 111 and the second source line 112. This facilitates the fabrication of the metal pattern structure containing the source 11 and the drain 12, reduces the fabrication process difficulty of the source 11 and the drain 12, and reduces the fabrication process difficulty of the display panel.

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

[0112] Based on the above embodiments, in one embodiment of this application, the area of ​​the drain 12 can be set to be larger than the area of ​​the source 11. Since heat in the transistor is concentrated at the drain 132, at least part of the heat from the drain 132 will be conducted to the drain 12. The metal drain 12 can dissipate heat using the drain 12 as a heat spreader, preventing heat concentration and improving the transistor's heat dissipation performance. In this method, setting the area of ​​the drain 12 to be larger than the area of ​​the source 11 improves the heat spreader effect of the drain 12, dissipating heat over a larger area and preventing heat concentration, thus improving the heat dissipation effect.

[0113] refer to Figure 19 , Figure 19 This application provides a partial cross-sectional view of a display panel in the drain region, based on the above-described embodiments. Figure 19In the display panel shown, multiple metal layers are sequentially stacked on the same side surface of the substrate 15. At least one of the multiple metal layers has a thermally conductive metal portion 22, which is in thermal contact with the drain electrode 12. In this manner, the thermally conductive metal portion 22 can conduct heat from the drain electrode 12 to other areas of the display panel, preventing heat accumulation in the drain electrode 12, increasing the heat dissipation area, and improving the heat dissipation effect.

[0114] like Figure 19 As shown, the thermally conductive metal portion 22 may be located on a different metal layer from the drain electrode 12, with an insulating layer between them. In this case, the thermally 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 thermally conductive metal portion 22 and the drain electrode 12 may be two adjacent metal layers on the substrate 15, or they may be two non-adjacent metal layers. This embodiment does not limit this. Figure 19 This is a partial cross-sectional view of the display panel, showing only the drain electrode 12 and the heat-conducting metal part 22 disposed on the substrate 15, and not the active layer 10 and other metal layers.

[0115] When the thermally conductive metal part 22 and the drain electrode 12 are located on different metal layers, they can achieve thermal contact through an isomorphic thermally conductive structure 23. Optionally, the thermally conductive structure 23 can be a through-hole structure filled with thermally conductive material. The thermally conductive material can be any material such as metal, thermally conductive silicone, or graphene.

[0116] In other embodiments, the heat-conducting metal part 22 may also be located on the same metal layer as the drain electrode 12. The heat-conducting metal part 22 and the drain electrode 12 are integrally formed, which can conduct the heat in the drain electrode 12 to other areas on the same plane through the heat-conducting metal part 22 on the same layer, thereby increasing the heat dissipation area and improving the heat dissipation efficiency.

[0117] refer to Figure 20 , Figure 20 This is a partial cross-sectional view of the drain region of another display panel provided in an embodiment of this application, based on the above-described implementation. Figure 20 In the display panel shown, the gate 14 is located on the side of the active branch 101 away from the substrate 15. A light-shielding metal layer 24 is also 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 configuration, the gate 14 is located on the side of the active branch 101 away from the substrate 15, and the transistor has a top-gate structure. To prevent leakage current in the channel region due to light incident from the substrate 15 side, a light-shielding metal layer 24 is provided between the substrate 15 and the active layer 10. In the third direction Z, the light-shielding metal layer 24 at least partially overlaps with the channel region 133, thereby blocking the channel region 133 and reducing the illumination of the channel region 133 by light incident from below the substrate 15.

[0118] like Figure 20 As shown, a light-shielding metal layer 24 is also provided in the display panel to make thermal contact with the drain 12. The light-shielding metal layer 24 can be reused as a heat-spreading metal layer to conduct heat from the drain 12 to other areas of the display panel, thus preventing heat accumulation in the drain 12 and increasing the heat dissipation area, thereby improving heat dissipation efficiency. Since the light-shielding metal layer 24 and the drain 12 are located in different metal layers, thermal contact between them can be achieved through a thermally conductive structure 23. As mentioned above, the thermally conductive structure 23 can be a through-hole structure filled with thermally conductive material.

[0119] When the light-shielding metal layer 24 is made in thermal contact with the drain 12 to reuse the light-shielding metal layer 24 for heat dissipation, the source 11 and drain 12 can be as follows: Figure 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. Alternatively, as described in the previous embodiment, the source electrode 11 and the drain electrode 12 can be prepared simultaneously based on the same metal layer.

[0120] When other metal layers in the display panel are configured to make thermal contact with the drain 12 to reuse other metal layers for heat dissipation, the relative positions of the metal layer containing the drain 12 and the other metal layers in thermal contact with the drain 12 in the display panel can be determined according to requirements, and the implementation method is not limited to this. Figure 19 and Figure 20 The scheme shown can be adjusted according to wiring requirements to achieve thermal contact between the drain 12 and other metal layers, while ensuring that the source 11 and drain 12 in the transistor are connected to the active branch 101.

[0121] refer to Figure 21 , Figure 21 This application provides a schematic diagram illustrating the connection principle between an active branch and an active layer in a display panel, as shown in the embodiment of the present application. Figure 21 This is a top view of an active branch 101 in the display panel. (Referring to the accompanying drawings of the above embodiment.) Figure 21 As shown, based on the above embodiment, in the same active branch 101, the source end 131 can be connected to the source electrode 11 through a first conductive hole 161, and the drain end 132 can be connected to the drain electrode 12 through a 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 method, the source end 131 can be connected to the source electrode 11 through a first conductive hole 161, and the drain end 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 Figure 21In the illustrated configuration, the area of ​​the second conductive hole 162 is larger than the area of ​​the first conductive hole 161, which allows for a larger thermal contact area between the drain end 132 and the drain electrode 12. This enables heat to be quickly conducted from the drain end 132 to the drain electrode 12. The drain electrode 12 is made of metal and has a high thermal conductivity, allowing heat to be conducted more quickly to other areas of the display panel through the drain electrode 12, thereby improving heat dissipation performance.

[0123] In other embodiments of this application, the first conductive hole 161 and the second conductive hole 162 may be configured to have the same area so that the conductive holes in the display panel are fabricated based on the same size parameters, thereby reducing the difficulty of the manufacturing process of the display panel.

[0124] refer to Figure 22 , Figure 22 This is a schematic diagram illustrating the connection principle between an active branch and an active layer in another display panel provided in an embodiment of this application. Figure 22 This is a top view of an active branch 101 in the display panel. (Referring to the accompanying drawings of the above embodiment.) Figure 22 As shown, based on the above embodiment, in the same active branch 101, the source end 131 is connected to the source electrode 11 through a first number of first conductive holes 161, and the drain end 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 method, the apertures of the first conductive holes 161 and the second conductive holes 162 can be the same. By setting the second number to be greater than the first number, a larger thermal contact area can be provided between the drain end 132 and the drain electrode 12, thereby enabling the heat from the drain end 132 to be quickly conducted to the drain electrode 12, preventing the accumulation of heat at the drain end 132.

[0125] As described above, in this embodiment, the width of the active branch 101 in the first direction Y can remain uniformly constant. That is, the width of the active branch 101 remains uniformly constant along the second direction X. From the source end 131 to the drain end 132, the width of the active branch 101 at different positions is the same or approximately the same. In this case, at least some or all of the active branches 101 can be set to have a uniformly constant width in the first direction Y, so as to facilitate the fabrication process of the active branch 101 and reduce the difficulty of the display panel fabrication process.

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

[0127] exist Figure 23 In the configuration, the width of the active branch 101 gradually increases along the direction from the source end 131 to the drain end 132 in the first direction Y. This allows the drain end of the active branch 101 to have a larger area, which facilitates heat dissipation and prevents heat accumulation in a small area. Furthermore, the larger area of ​​the drain end 132 also allows it to have a larger heat conduction area, which facilitates faster heat conduction from the drain end 132 along the third direction Z and the opposite direction of the third direction. This allows heat to be transferred to other film layers of the display panel more quickly, improving the heat dissipation effect.

[0128] Based on the display panel provided in the above embodiments, another embodiment of this application also provides a display device, the structure of which is as follows: Figure 24 As shown.

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

[0130] In this embodiment, the display device uses the display panel 25 provided in the above embodiment, which can improve the heat dissipation effect of the transistors in the display panel, thereby improving the image display effect.

[0131] Optionally, the display device includes, but is not limited to, electronic devices with display functions such as mobile phones, tablets, laptops, and smart wearable devices.

[0132] The various embodiments in this application are described in a progressive, parallel, or combined manner. Each embodiment focuses on its differences from other embodiments, and similar or identical parts between embodiments can be referred to interchangeably. The embodiments provided in this application can be combined with each other without contradiction.

[0133] It should be noted that, in the description of this application, the accompanying drawings and embodiments are illustrative rather than restrictive. The same reference numerals throughout the embodiments identify the same structures. Additionally, for ease of understanding and description, the thicknesses of some layers, films, panels, regions, etc., may be exaggerated in the drawings. It is also understood that when an element such as a layer, film, region, or substrate is referred to as being "on" another element, the element may be directly on the other element or there may be intermediate elements. Furthermore, "on" means positioning an element on or below another element, but does not inherently mean positioning it above another element according to the direction of gravity.

[0134] The terms "upper," "lower," "top," "bottom," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing this application and for simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this application. When a component is considered to be "connected" to another component, it can be directly connected to the other component or there may be a component positioned centrally in the middle.

[0135] It should also be noted that, in this document, relational terms such as "first" and "second" are used merely to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that an article or apparatus comprising a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such an article or apparatus. Without further limitations, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the article or apparatus that includes the aforementioned element.

[0136] The above description of the disclosed embodiments enables those skilled in the art to make or use this application. Various modifications to these embodiments will be readily 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 this application. Therefore, this application is not to be limited to the embodiments shown herein, but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A display panel, characterized in that, include: Base; An active layer is located on the surface of the substrate; The active layer includes a plurality of active branches arranged sequentially in a first direction, the active branches extending along a second direction; the first direction and the second direction intersect and are both parallel to the plane of the substrate; each active branch includes a source end, a drain end, and a channel region located between the source end and the drain end; the source end is connected to the source electrode, and the drain end is connected to the drain electrode; A gate extending along the second direction; in a direction perpendicular to the plane of the substrate, the gate and the channel region of the active branch both overlap. The plurality of active branches include at least one first active branch and one second active branch, wherein 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. The gate is located in a first metal layer, the drain is located in a second metal layer, the source is located in a third metal layer, and the active layer is located between the second metal layer and the third metal layer; the drain includes a first drain line and a second drain line distributed sequentially along the second direction, and the source includes a first source line and a second source line distributed sequentially along the second direction; in a direction perpendicular to the plane of the substrate, the gate is located between the first drain line and the second drain line, and between the first source line and the second source line; wherein, in the first active branch, the source end is connected to the first source line, and the drain end is connected to the second drain line; in the second active branch, the source end is connected to the second source line, and the drain end is connected to the first drain line; Alternatively, the gate is located in a first metal layer, and the source and drain are both located in a second metal layer; one of the source and drain includes a first trace and a second trace arranged sequentially in the second direction, and the other is a third trace located between the first trace and the second trace; in a direction perpendicular to the plane of the substrate, the gate is located between the first trace and the second trace; if the source includes the first trace and the second trace, the source end of the first active branch is connected to the first trace, and the source end of the second active branch is connected to the second trace; if the drain includes the first trace and the second trace, the drain end of the first active branch is connected to the second trace, and the drain end of the second active branch is connected to the first trace.

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 sequentially; Alternatively, the first and second active branch groups are arranged alternately; The first active branch group includes at least one first active branch, and the second active branch group includes at least one second active branch.

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

4. The display panel according to claim 1, characterized in that, When the gate is located in the first metal layer, the drain is located in the second metal layer, the source is located in the third metal layer, and the active layer is located between the second metal layer and the third metal layer, the first metal layer is located between the third metal layer and the active layer.

5. The display panel according to claim 1, characterized in that, When the gate is located in the first metal layer, the drain is located in the second metal layer, the source is located in the third metal layer, and the active layer is located between the second metal layer and the third metal layer, the second metal layer is located between the substrate and the active layer.

6. The display panel according to claim 1, characterized in that, When the gate is located in the first metal layer, the drain is located in the second metal layer, the source is located in the third metal layer, and the active layer is located between the second metal layer and the third metal layer, the second metal layer is located on the side of the active layer away from the substrate.

7. The display panel according to claim 1, characterized in that, In a direction perpendicular to the plane of the substrate, the first source trace is perpendicular to the first drain trace, and the second source trace is perpendicular to the second drain trace.

8. The display panel according to claim 1, characterized in that, When the gate is located in the first metal layer, the drain is located in the second metal layer, the source is located in the third metal layer, and the active layer is located between the second metal layer and the third metal layer, 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. The thermal conductivity of the first insulating layer is greater than that of the second insulating layer.

9. The display panel according to claim 1, characterized in that, The drain includes the first trace and the second trace, and the source includes the third trace.

10. The display panel according to claim 1, characterized in that, The third routing line has a plurality of first comb teeth arranged sequentially along the first direction on the side facing the first routing line, and a plurality of second comb teeth arranged sequentially along the first direction on the side facing the second routing line. If the drain includes the third trace, the drain end of the first active branch is connected to the third trace through the second comb teeth, and the drain end of the second active branch is connected to the third trace through the first comb teeth. If the source includes the third trace, the source end of the first active branch is connected to the third trace through the first comb teeth, and the source end of the second active branch is connected to the third trace through the second comb teeth.

11. The display panel according to claim 10, characterized in that, The third trace has a first width d1 in the second direction; Both the first comb tooth and the second comb tooth 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.

12. The display panel according to claim 1, characterized in that, The third trace is located on the side of the gate that is away from the active layer; Wherein, in a direction perpendicular to the plane of the substrate, the third trace overlaps with the gate.

13. The display panel according to claim 11, characterized in that, An insulating layer is provided between the third trace and the gate, and the relative permittivity of the insulating layer is less than 3.

6.

14. The display panel according to claim 11, characterized in that, An insulating layer is provided between the third trace and the gate, and the thickness of the insulating layer is not less than 500 nm.

15. 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; The second area is larger than the first area.

16. The display panel according to claim 1, characterized in that, The area of ​​the drain is larger than the area of ​​the source.

17. The display panel according to claim 1, characterized in that, Multiple metal layers are sequentially stacked on the same side surface of the substrate, at least one of the multiple metal layers having a thermally conductive metal portion that is in thermal contact with the drain electrode.

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

19. 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 larger than the area of ​​the first conductive hole.

20. 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 holes, and the drain end is connected to the drain electrode through a second number of second conductive holes; The second quantity is greater than the first quantity.

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

22. A display device, characterized in that, include: The display panel as described in any one of claims 1-21.

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