Display substrate and display device

Abstract

The invention provides a display substrate and a display device. The display substrate comprises a display area and a frame area surrounding at least part of the display area, the display area comprises light-emitting units arranged in an array mode, and the display substrate further comprises a substrate body; a driving layer is arranged on the substrate, the driving layer comprises a driving circuit located in the display area, and the driving circuit is electrically connected to the corresponding light-emitting unit; the driving circuit comprises a first signal line extending in the first direction and a second signal line extending in the second direction, the material of the first signal line is different from that of the second signal line, and the first direction intersects with the second direction. Through the design, the thickness of the first signal line is reduced, the materials of the second signal line and the power signal line ELVDD are adjusted, and the production cost is reduced while the product specification and performance are met.

Description

Technical Field

[0001] This application relates to the field of display technologies, and particularly to a display substrate and a display device. Background Art

[0002] With the continuous development of display screen technologies, OLED (Organic Light Emitting Diode) display panels have gradually replaced traditional LCD display panels. Conventional OLED display technologies were first applied to small sizes, such as in straight mobile phones, foldable mobile phones, watches, bracelets, etc. The technology in this field has been relatively mature. However, in the application of medium sizes, it is still in its infancy. Many designs still refer to the design experience of small sizes. However, considering the size difference and PPI (Pixels Per Inch) difference (the PPI of small sizes is generally relatively high, about between 400 - 550 PPI, while the PPI of medium sizes is generally relatively low, about between 300 - 400), the wiring scheme suitable for small sizes may not be the optimal wiring design scheme for medium sizes.

[0003] Therefore, it is necessary to improve the existing display panels. Summary of the Invention

[0004] In view of this, the purpose of this application is to propose a display substrate and a display device, aiming to improve the process performance of the display panel.

[0005] To achieve the above purpose, this application adopts the following technical solutions.

[0006] A display substrate, which includes:

[0007] A display area and at least a part of a border area surrounding the display area. The display area includes light-emitting units arranged in an array, and further includes:

[0008] A substrate;

[0009] A driving layer is disposed on the substrate. The driving layer includes a driving circuit located in the display area, and the driving circuit is electrically connected to the corresponding light-emitting unit;

[0010] The driving circuit includes a first signal line extending in a first direction and a second signal line extending in a second direction. The material of the first signal line is different from that of the second signal line, wherein the first direction intersects with the second direction.

[0011] In a preferred embodiment, the first signal line is used for transmitting a scanning signal, and the thickness of the first signal line is between

[0012] Preferably, the material of the first signal line includes aluminum, and the thickness of the aluminum film formed thereby is between

[0013] Preferably, the thickness of the aluminum film is between

[0014] Preferably, the thickness of the aluminum film is between

[0015] Preferably, high melting point metal films are deposited on the bottom and top surfaces of the aluminum film respectively;

[0016] Preferably, the material of the metal film is titanium.

[0017] In a preferred embodiment, the second signal line is used to transmit a data voltage signal;

[0018] Preferably, the second signal line includes GATO metal;

[0019] Preferably, the material of the second signal line includes molybdenum and / or titanium;

[0020] Preferably, the second signal line includes a stacked molybdenum layer and a titanium layer.

[0021] In a preferred embodiment, the thickness of the second signal line is between

[0022] Preferably, the thickness of the second signal line is between

[0023] Preferably, the thickness of the second signal line is between

[0024] In a preferred embodiment, the display substrate further includes a power supply signal line, and the power supply signal line is disposed on the same layer as the second signal line;

[0025] Preferably, the material of the power supply signal line includes molybdenum and / or titanium;

[0026] Preferably, the power supply signal line includes GATO metal;

[0027] Preferably, the power supply signal line extends along the second direction.

[0028] In a preferred embodiment, the thickness of the power supply signal line is between

[0029] Preferably, the thickness of the power supply signal line is between

[0030] Preferably, the thickness of the power supply signal line is between

[0031] In a preferred embodiment, the driving layer includes a first metal part, the driving circuit includes a transistor, and the gate of the transistor serves as the first metal part and is electrically connected to the first signal line;

[0032] Preferably, the driving layer includes a first metal layer, the first metal layer includes a first metal part, the driving circuit includes a transistor, the gate of the transistor is the first metal part, and the first metal part is electrically connected to the first signal line;

[0033] Preferably, the second signal line is disposed on the same layer as the first metal part;

[0034] Preferably, an insulating layer is disposed on the second signal line, a first signal line is disposed on a side of the insulating layer away from the second signal line, the insulating layer is provided with a through hole, and the first signal line is electrically connected to the first metal part through the through hole;

[0035] Preferably, the second signal line and the first metal part are located in the first metal layer, and the first metal layer includes GATO metal, and its material includes molybdenum and / or titanium;

[0036] Preferably, an insulating layer is disposed on the second signal line, a first signal line is disposed on a side of the insulating layer away from the second signal line, the insulating layer is provided with a through hole, and the first signal line is electrically connected to the first metal part through the through hole;

[0037] Preferably, an insulating layer is disposed on the first metal part, the second signal line is located in the second metal layer, the insulating layer is provided with the second signal line, an inorganic insulating layer is disposed on the second signal line, a first signal line is disposed on a side of the inorganic insulating layer away from the first metal part, the first signal line is located in the third metal layer, the inorganic insulating layer is provided with a through hole, and the first signal line is electrically connected to the first metal part through the through hole of the inorganic insulating layer;

[0038] Preferably, an insulating layer is disposed on the first metal part, the second signal line is disposed on the insulating layer, the second signal line is located in the second metal layer, an inorganic insulating layer is disposed on the second signal line, a first signal line is disposed on a side of the inorganic insulating layer away from the first metal part, the first signal line is located in the third metal layer, the inorganic insulating layer is provided with a through hole, and the first signal line is electrically connected to the first metal part through the through hole of the inorganic insulating layer;

[0039] Preferably, the first metal part is L-shaped;

[0040] Preferably, a positive projection of the first metal part on the substrate side is L-shaped;

[0041] Preferably, the [component] includes a driving transistor and a switching transistor. The driving transistor is a low-temperature polycrystalline oxide transistor, and the switching transistor is an oxide thin-film transistor.

[0042] In a preferred embodiment, the material of the second signal line includes molybdenum, and its thickness is between

[0043] Preferably, the thickness of the second signal line is between

[0044] It further includes a power supply signal line. The material of the power supply signal line includes molybdenum, and its thickness is between

[0045] Preferably, the thickness of the power supply signal line is between

[0046] In a preferred embodiment, the length of the display area extending along the first direction is greater than the length extending along the second direction.

[0047] Preferably, the ratio of the length of the display area extending along the first direction to the length extending along the second direction is selected from 4:3, 16:9, or 5:4.

[0048] Based on the same inventive concept, the present application provides a display device, which includes the above-mentioned display substrate and driving chips, and the number of the driving display chips is more than 2.

[0049] Preferably, the display frequency of the display device is lower than 120 Hz.

[0050] Preferably, the display frequency of the display device is 30 Hz, 60 Hz, 75 Hz, or 120 Hz.

[0051] Compared with the prior art, in the present application, by optimizing the first signal line and the second signal line, the first signal line uses a titanium-aluminum-titanium material and optimizes its thickness (the thickness is reduced to about half of the existing SD trace film thickness); the second signal line and the power supply signal line ELVDD respectively use GATO metal (also known as GATO trace) or molybdenum material traces. While meeting the product specifications and performance, it saves a manufacturing process corresponding to a mask for the SD trace, reducing the production cost. The display substrate can be used in occasions where the display frequency is lower than 120 Hz (such as 30 Hz, 60 Hz, 75 Hz during operation). The display substrate can be used for a display area where the length extending along the first direction is greater than the length extending along the second direction. Description of the Drawings

[0052] To more clearly illustrate the technical solutions in the present application or related technologies, the following will briefly introduce the drawings required for use in the embodiments or related technology descriptions. Obviously, the drawings in the following descriptions are only the embodiments of the present application. For those of ordinary skill in the art, without creative efforts, other drawings can also be obtained based on these drawings.

[0053] Figure 1 It is a wiring schematic diagram of a display module;

[0054] Figure 2 It is a wiring schematic diagram of a display substrate according to an embodiment of the present application;

[0055] Figure 2a It is a cross-sectional schematic diagram of the wiring of the first signal line and the second signal line according to an embodiment of the present application;

[0056] Figure 3 It is a wiring schematic diagram of a display substrate according to another embodiment of the present application;

[0057] Figure 4 For Figure 3 cross-sectional schematic diagram;

[0058] Figure 4a It is a cross-sectional schematic diagram of the wiring of the first signal line and the second signal line according to another embodiment of the present application;

[0059] Figure 5 It is a structural schematic diagram of a display device according to an embodiment of the present application. Detailed implementation manners

[0060] To make the objectives, technical solutions and advantages of the present application more clear and understandable, the following further elaborates on the present application in detail in conjunction with specific embodiments and with reference to the accompanying drawings.

[0061] It should be noted that unless otherwise defined, the technical terms or scientific terms used in the embodiments of the present application should have the ordinary meanings understood by those of ordinary skill in the art to which the present application belongs. The "first", "second" and similar terms used in the embodiments of the present application do not indicate any order, quantity or importance, but are only used to distinguish different components. The terms such as "including" or "comprising" mean that the elements or objects appearing before this word cover the elements or objects listed after this word and their equivalents, without excluding other elements or objects. The terms such as "connected" or "coupled" are not limited to physical or mechanical connections, but may include electrical connections, whether direct or indirect. The terms such as "upper", "lower", "left", "right" are only used to represent relative positional relationships. When the absolute position of the object being described changes, the relative positional relationship may also change accordingly.

[0062] With the continuous development of display screen technology, OLED (Organic Light Emitting Diode) display panels are gradually replacing traditional LCD display panels. The display panels have developed from small sizes (usually with a display area width ≤ 140mm) to medium sizes. Currently, the small-size OLED display technology is relatively mature. However, the application scenarios of medium-size OLED display panels are different from those of small sizes. The specifications and wiring suitable for small-size occasions have problems of high power consumption and low yield when used in medium sizes.

[0063] Therefore, the applicant studies the structure of the current medium-size display panels (with a display area width ≥ 180mm, such as in-vehicle, laptop computers, etc.). The current medium-size display panels are referred to Figure 1 Mostly rectangular, with a display area 110 (also known as the AA area). Generally, a double-layer SD signal line wiring method is adopted. Signal lines 111 are arranged in the first direction (x direction) and used as (gate) signal lines. Generally, more than 2 driving chips (DDIC) 130 are required for driving in the horizontal direction; signal lines 112 are arranged in the second direction (y direction) and used as data signal lines (the power supply signal line ELVDD can also be set to extend along the second direction, etc.). In this way, the signal lines 111 arranged in the first direction need to jump wires and change lines to Mo / Mo traces at each pixel, so as to drive the transistors corresponding to the pixels. In this way, more processes are required in the manufacturing process. In addition, the current signal lines 111 are relatively thick, and the thickness exceeds In this way, the impedance of long-distance wiring is relatively large, the power consumption is high, and the time required for coating is long, increasing the manufacturing cost.

[0064] Based on this discovery, the applicant improves the existing display panel to reduce the manufacturing cost and its power consumption at the same time.

[0065] Next, the display substrate and display device proposed in this application will be described with reference to the accompanying drawings.

[0066] The display substrate includes a display area, and the display substrate further includes:

[0067] A substrate, which is a flexible substrate, and its material can be selected from polyimide (PI), polyethylene naphthalate (PEN), or polyethylene terephthalate (PET), etc. The material can also be a mixture of the above-mentioned multiple materials, or the substrate can be a rigid substrate, and its material can be selected from glass.

[0068] A driving layer is provided on the substrate, and the driving layer includes pixel driving circuits located in the display area. The pixel driving circuits can be formed in various forms such as 2T1C (i.e., 2 transistors (TFTs) and 1 capacitor (C)), 7T1C, 7T2C, or 8T2C, etc. The pixel driving circuit includes a driving transistor and a switching transistor. The driving transistor is a low-temperature polycrystalline oxide transistor (LTPS TFT), and the switching transistor is an oxide thin-film transistor (IGZO TFT). The pixel driving circuit is electrically connected to the corresponding light-emitting unit in the light-emitting functional layer to control the on / off state and the light-emitting brightness of the light-emitting unit. Preferably, the driving layer includes a semiconductor layer, a first metal layer, a second metal layer, a third metal layer (the first metal layer, the second metal layer, and the third metal layer are collectively referred to as the metal layer), and an insulating layer provided between adjacent two conductive film layers (metal layers). The insulating layer can be made of materials such as silicon oxide and / or silicon nitride. The semiconductor layer includes an active layer, and the active layer includes a channel region, a source region, and a drain region for forming a transistor (such as a P-type or N-type). The first metal layer includes the gate of the transistor. The gate in the first metal layer M1 overlaps with the active layer, and the part of the active layer located at the overlapping part is the channel region of the corresponding transistor. The part of each scanning line located at the overlapping part constitutes the gate of the transistor. The traces in the first metal layer and the second metal layer respectively include one electrode plate of the storage capacitor Cst (for example, the second metal layer includes the upper electrode plate of the storage capacitor, and the first metal layer includes the lower electrode plate of the storage capacitor). Their combination forms a storage capacitor. Multiple signal lines with different orientations are provided in both the second metal layer and the third metal layer (in some embodiments, a fourth metal layer is provided and signal lines are provided). The corresponding signal lines are respectively electrically connected to the transistor and the storage capacitor in a matching manner, thereby forming a pixel driving circuit.

[0069] As Figure 2 shown is a schematic diagram of the wiring of a display substrate according to an embodiment of the present application.

[0070] The display substrate 200 includes a display area 210 and at least a part of a border area 220 surrounding the display area 210. The display area includes light-emitting units 210a (also called pixels) arranged in an array. The display substrate further includes:

[0071] A substrate;

[0072] A driving layer is provided on the substrate, and the driving layer includes: a semiconductor layer and a first metal layer stacked in sequence;

[0073] A first signal line 251 extending in a first direction and a second signal line 252 extending in a second direction.

[0074] The first signal line 251 may be located in the second metal layer, and the second signal line 252 may be located in the first metal layer. An insulating layer 233 is provided on the second signal line. The insulating layer 233 has a via 232 that exposes a part of the first metal portion 231.

[0075] The first signal line 251 (also referred to as the SD trace) is used as a gate signal line to transmit the gate signal of the transistor (such as an IGZO (Indium Gallium Zinc Oxide) type TFT (Thin-Film Transistor)). At the IGZO TFT of the corresponding pixel (light-emitting unit 210a), the first signal line 251 is electrically connected to the first metal portion 231 through the via 232 of the insulating layer 233 below it. The first metal portion 231 serves as the gate of the IGZO type transistor (the gate of the IGZO TFT (using GATO metal)), such as Figure 2a shown. Preferably, the first metal portion is L-shaped. Preferably, the material of the first metal portion is molybdenum (Mo) and / or titanium (Ti) (such as a stacked molybdenum layer and titanium layer). The material of the first signal line includes aluminum, and the thickness of the formed aluminum film is between (angstroms). Preferably, the thickness of the aluminum film (angstroms). Preferably, the thickness of the aluminum film is between Preferably, the thickness of the aluminum film is between (such as ). Preferably, high melting point metal thin films (such as titanium / Ti, melting point 1660 °C) are deposited on the bottom and top surfaces of the aluminum film of the first signal line respectively. In this way, the compressive stress generated in the Al film is absorbed when it reaches the surfaces of the bottom and surface titanium thin films, releasing the thermal stress of the aluminum / Al. And when reaching a certain thickness, the compressive stress of the Al film is completely absorbed, suppressing hillock formation. Preferably, the material of the first signal line includes titanium-aluminum-titanium, and its thickness is between (angstroms); preferably, the thickness of the first signal line is between (angstroms); preferably, the thickness of the first signal line is between (angstroms). Through such a design, the film thickness of the aluminum film in the first signal line is reduced. Compared with the existing design where the film thickness of the aluminum film is While meeting the impedance requirements, the film thickness is reduced, saving coating time and coating materials, and reducing the production cost of the product. In this embodiment, the first signal line 251 is located in the second metal layer, and this layer includes the electrode plate of the storage capacitor (such as the upper electrode plate).

[0076] The second signal line 252 serves as a data signal line for transmitting the written data voltage signal. The second signal line 252 is provided on the same layer as the first metal part 231 and is not connected to the first metal part 231. During fabrication, it can be prepared by patterning the obtained first metal layer (also known as GATO metal). The GATO metal includes materials such as molybdenum (Mo) and / or titanium (Ti) (such as a stacked molybdenum layer and titanium layer). In other embodiments, the GATO metal can also be prepared using a multi-metal doped oxide, for example, indium gallium zinc oxide. The thickness of the second signal line 252 is between (angstroms). Preferably, the thickness of the second signal line is between (angstroms); preferably, the thickness of the second signal line is between (angstroms) (such as ). The second signal line 252 extending in the second direction serves as a data signal line and has no long pull lines in the first direction. The advantage of such a design is that it can avoid short circuits caused by routing interference and can also save a Mask process for SD routing.

[0077] The display substrate further includes a power signal line ELVDD (not shown in the figure) extending in the second direction. The power signal line can be provided on the same layer as the second signal line, and its thickness is the same as that of the second signal line. For example, the thickness of the power signal line is between (angstroms); preferably, the thickness of the power signal line is between (angstroms). By selecting GATO metal for both the data signal line and the power signal line, the film layer thickness can be reduced while reducing the number of masks and manufacturing processes, thereby reducing the production cost of the product. The display substrate further includes an initialization signal line (not shown in the figure), which can be provided in the second metal layer and / or the third metal layer and extends in the second direction. The display substrate 200 adopts a single-layer SD routing method, that is, the first signal line extending in the first direction uses SD routing and reduces the film thickness (compared to the film thickness of the existing SD routing), and the routing of the second signal line (data signal line) and the power signal line ELVDD extending in the second direction uses GATO metal. While meeting the product specifications and performance, it saves a mask for SD routing and the SD manufacturing process, reduces the film thickness of the horizontal SD, and thus reduces the production cost of the product. The display substrate can be used in applications where the display frequency is lower than 120 Hz (such as a display frequency of 30 Hz, 60 Hz, or 75 Hz during operation). The display area of the display substrate is designed such that the length extending in the first direction is greater than the length extending in the second direction (also known as a landscape screen). Preferably, the ratio of the length extending in the first direction to the length extending in the second direction of the display device is selected from 4:3, 16:9, or 5:4.

[0078] As a variation of the above embodiment, such asFigure 3 The figure shows a schematic diagram of the wiring of a display substrate according to another embodiment of the present application. Figure 4 is Figure 3 a schematic diagram of a cross-section of

[0079] The display substrate 300 includes a display area 310 and a border area 320 that at least partially surrounds the display area 310. The display area includes light-emitting units arranged in an array. The display substrate further includes:

[0080] a substrate 340;

[0081] A driving layer 350 is provided on the substrate 340. The driving layer includes: a semiconductor layer, a first metal layer, a second metal layer, and a third metal layer stacked in sequence. The material of the first metal layer includes molybdenum / Mo, and its thickness is between (angstroms).

[0082] A first signal line 351 extending in a first direction and a second signal line 352 extending in a second direction. In other embodiments, the first signal line 351 may be located in the third metal layer, and the second signal line 352 may be located in the second metal layer.

[0083] The first signal line 351 serves as a gate signal line for transmitting the gate signal of a transistor (such as an IGZO (indium gallium zinc oxide) type TFT (Thin-Film Transistor)). At the IGZO TFT of the corresponding pixel, a small section of the first metal portion 331 (the second metal portion 331 is made of molybdenum / Mo) is electrically connected to the transistor (IGZO TFT) through a perforation 332 of an insulating film layer (the insulating film layer includes an insulating layer 334 (which may be formed by stacking SiNx and SiOx layers) and an inorganic insulating layer 333 (which includes SiNx)) below it. The first metal portion 331 serves as the gate of the transistor (IGZO TFT), as Figure 4a shown. The material of the first signal line includes aluminum, and the thickness of the formed aluminum film is between (angstroms). Preferably, the thickness of the aluminum film is between Preferably, high melting point metal films (such as titanium / Ti, melting point 1660 °C) are deposited on the bottom and surface of the aluminum film respectively. With such a design, the compressive stress generated in the aluminum film is absorbed when it reaches the surfaces of the titanium films at its bottom and surface, so as to inhibit the formation of hillocks. Preferably, the material of the first signal line includes titanium-aluminum-titanium, and its thickness is between (angstroms); preferably, the thickness of the first signal line is between (angstroms); preferably, the thickness of the first signal line is between (angstroms). Through such a design, the film thickness of the aluminum film in the first signal line is reduced. Compared with the existing design where the film thickness of the aluminum film is While meeting the impedance requirements, the film thickness is reduced, saving coating time and coating materials, and reducing the production cost of the product.

[0084] The second signal line 352 serves as a data signal line for transmitting the written data voltage signal. The material of the second signal line 352 includes molybdenum / Mo, and its thickness is between (angstroms); preferably, the thickness of the second signal line is between (angstroms) (such as ). The second signal line 352 extending along the second direction serves as a data signal line, and it has no long pull wires in the first direction and only serves as a capacitor plate (such as the upper plate) at the capacitor (storage capacitor) of the corresponding pixel. The advantage of such a design is that it can avoid short circuits caused by wiring interference and can also save a Mask process for SD wiring.

[0085] The display substrate further includes a power supply signal line ELVDD and an initialization signal line (not shown in the figure) extending along the second direction. The power supply signal line ELVDD and the initialization signal line are disposed in the second metal layer. The second metal layer also includes a plate of the storage capacitor Cst. The materials of the power supply signal line ELVDD and the initialization signal line both include molybdenum / Mo, and their thickness is the same as that of the second signal line 352.

[0086] Through such a design, the thickness of the first signal line extending along the first direction (the thickness of the aluminum film in the first signal line) can be reduced; the materials of the data signal line and the power supply signal line ELVDD extending along the second direction are adjusted (changed from the traditional SD wiring (titanium-aluminum-titanium material) to Mo or other materials) and the thickness of the film layer is reduced (the thickness is between Preferably, the thickness is ), and there are no long pull wires in the second direction and only serve as capacitor plates (such as the upper plate) at the capacitor of each pixel (pixel), and there is no problem of wiring interference short circuit. In this way, a Mask process for SD wiring can be saved, achieving the purpose of reducing the number of masks and the number of manufacturing processes, shortening the production time required, reducing costs, and meeting the specification requirements.

[0087] It should be noted that the display panel can also be set to include other functional structures. For example, the display panel can also include an identification structure to have a fingerprint identification function. For example, the identification structure can be a touch panel or a touch layer. The touch panel can be disposed in the display panel by a bonding method. For example, the touch layer can be directly prepared on the encapsulation layer of the display panel to facilitate the thin and light design of the display panel.

[0088] Another preferred embodiment of the present disclosure discloses a display device, which includes the substrate in the above embodiment. Furthermore, the display device includes a vehicle-mounted display device (such as a vehicle-mounted fish tape screen), an industrial control screen or an advertising screen, etc. The display frequency of the display device is lower than 120Hz when in operation (such as the display frequency is 30Hz, 60Hz, 75Hz, 90Hz or 120Hz when in operation). The ratio of the length extending in the first direction (x) of the display device to the length extending in the second direction (y) can be selected from 4:3, 16:9 or 5:4. By optimizing the first signal line and the second signal line on the substrate, the thickness of the first signal line is adjusted (the thickness is reduced to about half of the existing SD routing film thickness); the second signal line and the power signal line ELVDD use GATO metal (also called GATO routing) or routing including molybdenum material, while meeting product specifications and performance, while saving process technology and reducing production costs.

[0089] In one embodiment, see Figure 5 The display device 400 includes the above-mentioned display substrate, and three driver chips (DDIC) 422 are arranged in the border area 420. In other embodiments, the number of driver chips DDIC may be 2 or more. Furthermore, the display area of ​​the display device is designed to have a length extending along the first direction greater than the length extending along the second direction (also called a horizontal screen). Preferably, the ratio of the length extending in the first direction to the length extending in the second direction of the display device can be selected from 4:3, 16:9 or 5:4. The appearance of the display device can be rectangular or irregular (such as having arc corners).

[0090] Although the present application has been described in conjunction with specific embodiments thereof, many alternatives, modifications and variations of these embodiments will be apparent to those skilled in the art in light of the foregoing description.

[0091] It should be noted that the above describes some embodiments of the present application. Other embodiments are within the scope of the appended claims. In some cases, the actions or steps recorded in the claims can be performed in an order different from that in the above embodiments and still achieve the desired results. In addition, the processes depicted in the accompanying drawings do not necessarily require the specific order or continuous order shown to achieve the desired results. In some embodiments, multitasking and parallel processing are also possible or may be advantageous.

[0092] The embodiments of the present application are intended to cover all such substitutions, modifications and variations that fall within the broad scope of the appended claims. Therefore, any omissions, modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the embodiments of the present application should be included in the scope of protection of the present application.

Claims

1. A display substrate, characterized in that: include: A display area and a frame area surrounding at least part of the display area, wherein the display area includes light-emitting units arranged in an array, and further includes: substrate; A driving layer is disposed on the substrate, the driving layer includes a driving circuit located in the display area, and the driving circuit is electrically connected to the corresponding light-emitting unit; The driving circuit includes a first signal line extending along a first direction and a second signal line extending along a second direction. The material of the first signal line is different from that of the second signal line. The first direction intersects with the second direction.

2. The display substrate according to claim 1, wherein: The first signal line is used to transmit a scanning signal, and the thickness of the first signal line is between Preferably, the material of the first signal line includes aluminum, and the thickness of the aluminum film formed by the aluminum film is between Preferably, the thickness of the aluminum film is between Preferably, the thickness of the aluminum film is between Preferably, high melting point metal films are deposited on the bottom and top surfaces of the aluminum film respectively; Preferably, the metal film is made of titanium.

3. The display substrate according to claim 1, wherein: The second signal line is used to transmit a data voltage signal; Preferably, the second signal line comprises GATO metal; Preferably, the material of the second signal line includes molybdenum and / or titanium; Preferably, the second signal line includes a stacked molybdenum layer and a titanium layer.

4. The display substrate according to claim 3, wherein: The thickness of the second signal line is between Preferably, the thickness of the second signal line is between Preferably, the thickness of the second signal line is between 5. The display substrate according to claim 3 or 4, characterized in that: It also includes a power signal line, and the power signal line is arranged on the same layer as the second signal line; Preferably, the material of the power signal line includes molybdenum and / or titanium; Preferably, the power signal line comprises GATO metal; Preferably, the power signal line extends along the second direction.

6. The display substrate according to claim 5, wherein: The thickness of the power signal line is between Preferably, the thickness of the power signal line is between Preferably, the thickness of the power signal line is between 7. The display substrate according to claim 1, wherein: The driving layer includes a first metal portion, the driving circuit includes a transistor, a gate of the transistor serves as the first metal portion and is electrically connected to the first signal line; Preferably, the driving layer includes a first metal layer, the first metal layer includes a first metal portion, the driving circuit includes a transistor, a gate of the transistor is the first metal portion, and the first metal portion is electrically connected to the first signal line; Preferably, the second signal line is arranged in the same layer as the first metal portion; Preferably, an insulating layer is disposed on the second signal line, a first signal line is disposed on the side of the insulating layer away from the second signal line, the insulating layer is provided with a through hole, and the first signal line is electrically connected to the first metal part through the through hole; Preferably, the second signal line and the first metal portion are located in a first metal layer, and the first metal layer includes GATO metal, and its material includes molybdenum and / or titanium; Preferably, an insulating layer is provided on the second signal line, the second signal line is located in the second metal layer, the first signal line is provided on the side of the insulating layer away from the second signal line, the first signal line is located in the third metal layer, the insulating layer is provided with a through hole, and the first signal line is electrically connected to the first metal part through the through hole; Preferably, an insulating layer is provided on the first metal part, the second signal line is provided on the insulating layer, the second signal line is located in the second metal layer, an inorganic insulating layer is provided on the second signal line, the first signal line is provided on the side of the inorganic insulating layer away from the first metal part, the first signal line is located in the third metal layer, the inorganic insulating layer is provided with a through hole, and the first signal line is electrically connected to the first metal part through the through hole of the inorganic insulating layer; Preferably, the first metal portion is L-shaped; Preferably, the transistor comprises a driving transistor and a switching transistor, the driving transistor is a low temperature polycrystalline oxide type transistor, and the switching transistor is an oxide thin film transistor.

8. The display substrate according to claim 1, wherein: The material of the second signal line includes molybdenum, and the thickness thereof is between Preferably, the thickness of the second signal line is between Preferably, it also includes a power signal line, the material of the power signal line includes molybdenum, and the thickness is between Preferably, the thickness of the power signal line is between 9. The display substrate according to claim 1, wherein: The display area is configured to extend along the first direction to a greater length than along the second direction; Preferably, a ratio of a length of the display area extending along the first direction to a length of the display area extending along the second direction is selected from 4:3, 16:9 or 5:

4.

10. A display device, comprising a display substrate and a driving chip according to any one of claims 1 to 9, wherein the number of the driving display chips is more than 2; Preferably, the display frequency of the display device is lower than 120 Hz; Preferably, the display frequency of the display device is 30 Hz, 60 Hz, 75 Hz or 120 Hz.

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