Display panel, preparation method thereof and display device

Abstract

The invention discloses a display panel, a preparation method thereof and a display device. The display panel comprises a light-emitting element and a pixel driving circuit, and the pixel driving circuit is electrically connected with the light-emitting element. The display panel further comprises a driving substrate and a driving device, at least part of the driving device and the light-emitting element are located on the same side of the driving substrate, the driving device comprises at least part of the structure of the pixel driving circuit, and the driving substrate comprises at least part of the structure of the pixel driving circuit. At least part of structures in the pixel driving circuit are arranged in the driving device, so that the number of elements, wires and other structures in the driving substrate can be reduced, the related manufacturing process of part of film layers in the driving substrate can be omitted, the number of masks during preparation of the driving substrate can be reduced, the mask process is simplified, and the manufacturing efficiency of the driving substrate is improved. And the manufacturing cost and the manufacturing difficulty of the driving substrate are greatly reduced. In addition, a larger layout space can be provided for the pixel driving circuit structure in the driving substrate, and the wiring difficulty in the driving substrate is reduced.

Description

Technical Field

[0001] Embodiments of the present invention relate to the field of display technology, and in particular to a display panel and a manufacturing method thereof, and a display device. Background Art

[0002] At present, the driving substrate in the display panel includes a driving array, which is used to drive the light-emitting elements in the display panel to emit light. The driving array generally includes a large number of components and wiring and other parts. The manufacturing process of this driving substrate is complicated and requires about 11-19 mask exposures. The mask mold cost, the driving substrate manufacturing process cost and the process difficulty are all high. Summary of the invention

[0003] In view of this, the present invention provides a display panel and a manufacturing method thereof, and a display device, so as to reduce the process difficulty of a driving substrate in the display panel and reduce the overall manufacturing cost of the display panel.

[0004] In a first aspect, an embodiment of the present invention provides a display panel, comprising a light-emitting element and a pixel driving circuit, wherein the pixel driving circuit is electrically connected to the light-emitting element;

[0005] The display panel also includes a driving substrate and a driving device, at least part of the driving device and the light-emitting element are located on the same side of the driving substrate, the driving device includes at least part of the structure of the pixel driving circuit, and the driving substrate includes at least part of the structure of the pixel driving circuit.

[0006] In a second aspect, an embodiment of the present invention provides a method for preparing a display panel, which is used to prepare the display panel provided by any embodiment of the present invention. The method for preparing the display panel includes:

[0007] Providing a driving substrate, the driving substrate comprising at least a partial structure of a pixel driving circuit;

[0008] Providing a light-emitting element and a driving device, wherein the driving device includes at least a part of the structure of the pixel driving circuit;

[0009] At least part of the light emitting elements and / or at least part of the driving devices are transferred to the same side of the driving substrate, and the pixel driving circuit is electrically connected to the light emitting elements.

[0010] In a third aspect, an embodiment of the present invention provides a display device, including the display panel provided by any embodiment of the present invention.

[0011] The display panel provided by the embodiment of the present invention can reduce the number of components and wiring structures in the driving substrate by setting at least part of the structure in the pixel driving circuit in the driving device, thereby eliminating the related processes of some film layers in the driving substrate, which is conducive to reducing the number of masks in the preparation of the driving substrate, simplifying the mask process, and greatly reducing the manufacturing cost and difficulty of the driving substrate. In addition, it can also provide a larger layout space for the pixel driving circuit structure in the driving substrate, reducing the difficulty of wiring in the driving substrate. BRIEF DESCRIPTION OF THE DRAWINGS

[0012] Figure 1 A schematic diagram of the structure of a display panel in a related technology provided by an embodiment of the present invention;

[0013] Figure 2 A schematic diagram of the structure of a display panel provided by an embodiment of the present invention;

[0014] Figure 3 A schematic diagram of the structure of another display panel provided by an embodiment of the present invention;

[0015] Figure 4 for Figure 3 Schematic diagram of the cross-sectional structure along the A-A' direction;

[0016] Figure 5 A schematic diagram of the structure of another display panel provided by an embodiment of the present invention;

[0017] Figure 6 for Figure 5 Schematic diagram of the cross-sectional structure along the B-B' direction;

[0018] Figure 7 A schematic diagram of the structure of another display panel provided by an embodiment of the present invention;

[0019] Figure 8 A schematic diagram of the structure of another display panel provided by an embodiment of the present invention;

[0020] Fig. 9 A schematic structural diagram of a pixel driving circuit provided by an embodiment of the present invention;

[0021] Fig.10 A schematic diagram of the structure of another display panel provided by an embodiment of the present invention;

[0022] Fig.11 A schematic diagram of the structure of another display panel provided by an embodiment of the present invention;

[0023] Fig.12 A schematic diagram of the structure of another display panel provided by an embodiment of the present invention;

[0024] Fig.13A schematic diagram of the structure of another display panel provided by an embodiment of the present invention;

[0025] Fig.14 A schematic diagram of the structure of another display panel provided by an embodiment of the present invention;

[0026] Fig.15 A flow chart of a method for manufacturing a display panel provided by an embodiment of the present invention;

[0027] Fig.16 A flow chart of another method for preparing a display panel provided by an embodiment of the present invention;

[0028] Fig.17 for Fig.16 Flow chart of the preparation method shown;

[0029] Fig.18 A schematic structural diagram of a display device provided by an embodiment of the present invention. DETAILED DESCRIPTION

[0030] The present invention will be further described in detail below in conjunction with the accompanying drawings and embodiments. It is to be understood that the specific embodiments described herein are only used to explain the present invention, rather than to limit the present invention. It should also be noted that, for ease of description, only parts related to the present invention, rather than all structures, are shown in the accompanying drawings.

[0031] It should be noted that the terms “having”, “including”, “comprising”, etc. described in the present application are all open-ended meanings, that is, when describing a module as “having”, “including” or “comprising” a first element, a second element and / or a third element, it means that the module includes other elements in addition to the first element, the second element and / or the third element. In addition, ordinal numbers such as “first”, “second” and “third” in the present application are not intended to limit a specific order, but are only intended to distinguish between the various parts. In the present application, when describing that layer A and layer B are “set in the same layer”, it means that layer A and layer B are made of the same material and process.

[0032] The display panel includes a light emitting element and a pixel driving circuit. The pixel driving circuit is electrically connected to the light emitting element accordingly to drive the light emitting element to emit light. Figure 1 A schematic diagram of a display panel structure in a related technology provided by an embodiment of the present invention, referring to Figure 1In the related art, the light emitting elements 10 are arranged in an array on one side of the driving substrate 30, and the pixel driving circuit 20 is disposed inside the driving substrate 30. The pixel driving circuit 20 includes a plurality of components and a plurality of wiring structures. For example, taking a low temperature polysilicon (LTPS) panel as an example, low temperature polysilicon is generally used as the semiconductor medium of the transistor in the pixel driving circuit 20. At the same time, in conjunction with the circuit design, about 11-19 mask exposures are required in the LTPS panel technology. Due to the high cost of the mask, the mask cost is high when the solution in the related art is adopted, which greatly increases the manufacturing cost of the driving substrate.

[0033] Based on the defects of the above-mentioned related technologies, an embodiment of the present invention provides a display panel, including a light-emitting element and a pixel driving circuit, which is electrically connected to the light-emitting element; the display panel also includes a driving substrate and a driving device, at least part of the driving device and the light-emitting element are located on the same side of the driving substrate, the driving device includes at least part of the structure of the pixel driving circuit, and the driving substrate includes at least part of the structure of the pixel driving circuit.

[0034] Through the above technical solution, the number of components and wiring structures in the driving substrate can be reduced, so that the relevant processes of some film layers in the driving substrate can be eliminated, which is conducive to reducing the number of masks in the preparation of the driving substrate, simplifying the mask process, and greatly reducing the manufacturing cost and difficulty of the driving substrate. In addition, it can also provide a larger layout space for the pixel driving circuit structure in the driving substrate, reducing the difficulty of wiring in the driving substrate.

[0035] The above is the core idea of ​​the present invention. The technical scheme in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0036] Figure 2 A schematic diagram of the structure of a display panel provided by an embodiment of the present invention, Figure 3 A schematic diagram of the structure of another display panel provided by an embodiment of the present invention, Figure 4 for Figure 3 The cross-sectional structure diagram along the A-A' direction can be referred to Figure 2-Figure 4In an embodiment of the present invention, the display panel includes a light-emitting element 10 and a pixel driving circuit 20, and the pixel driving circuit 20 is electrically connected to the light-emitting element 10; the display panel also includes a driving substrate 30 and a driving device 40, at least part of the driving device 40 and the light-emitting element 10 are located on the same side of the driving substrate 30, the driving device 40 includes at least part of the structure of the pixel driving circuit 20, and the driving substrate 30 includes at least part of the structure of the pixel driving circuit 20.

[0037] like Figure 2-Figure 4 As shown, in this embodiment, the display panel includes a light emitting element 10, a driving device 40 and a driving substrate 30, wherein the driving device 40 is a component provided independently of the light emitting element 10. At least part of the driving device 40 can be arranged on the same side surface of the driving substrate 30 as the light emitting element 10. It can be defined that the light emitting element 10 and at least part of the driving device 40 are located on the first surface 30A of the driving substrate 30.

[0038] The driving substrate 30 may include a base substrate 300 and a metal layer 302 located on one side of the base substrate 300, and adjacent metal layers 302 are separated by an insulating layer 307. The base substrate 300 may be a rigid substrate such as glass or quartz, or a flexible substrate such as polyimide. The metal layer is used to lay out conductive structures, such as part of signal routing and connecting lines.

[0039] The display panel also includes a pixel driving circuit 20, which is electrically connected to the light emitting element 10 to drive the light emitting element 10 to emit light. Figure 2-Figure 4 As shown, unlike the related art in which the pixel driving circuit 20 is completely formed in the driving substrate 30, in the embodiment of the present invention, at least part of the circuit structure of the pixel driving circuit 20 can be set in the driving device 40, that is, at least part of the circuit structure of the pixel driving circuit 20 is moved to the driving device 40 on the first surface 30A of the driving substrate, and part of the circuit structure of the pixel driving circuit 20 is retained in the driving substrate 30.

[0040] For the same pixel driving circuit 20, there may be circuit structures located in the driving substrate 30 and the driving device 40 at the same time, and the circuit structure located in the driving substrate 30 is electrically connected to the circuit structure located in the driving device 40 to ensure normal transmission of signals in the pixel driving circuit 20. Among them, the side of the driving device 40 facing the driving substrate 30 may include a plurality of auxiliary conductive parts 400, and the side of the driving substrate 30 close to the driving device 40 may include a plurality of driving device connecting parts 301, and the auxiliary conductive parts 400 are electrically connected to the driving device connecting parts 301, so as to realize electrical connection between the circuit structure in the driving device 40 and the circuit structure in the driving substrate 30.

[0041] Under this configuration, it can be understood that part of the structure of the pixel driving circuit 20 originally set in the driving substrate 30 is moved to the driving device 40 outside the driving substrate 30, thereby reducing the number of components and wiring structures in the driving substrate 30. Canceling the relevant processes of some film layers in the driving substrate 30 is conducive to reducing the number of masks and simplifying the mask process when preparing the driving substrate 30, thereby greatly reducing the manufacturing cost and manufacturing difficulty of the driving substrate 30. In addition, it can also provide a larger layout space for the pixel driving circuit 20 structure in the driving substrate 30, reducing the difficulty of wiring in the driving substrate 30.

[0042] The light emitting element 10 includes a micro light emitting diode (Micro-LED). Micro-LED is a highly miniaturized LED technology that can achieve high pixel density and high resolution by arraying and miniaturizing traditional LEDs and transferring them to the driving substrate 30. Of course, the light emitting element 10 is not limited to micro light emitting diodes, but can also be Mini-LED or Nano-LED, etc., which will not be listed one by one in the embodiments of the present invention.

[0043] In addition, the embodiment of the present invention does not limit which structures in the pixel driving circuit 20 are located in the driving device 40 and which structures are located in the driving substrate 30 , and those skilled in the art may set them according to actual needs.

[0044] Optionally, the display panel may further include film layers such as a color resist layer (not shown in the drawings) and an encapsulation layer (not shown in the drawings), and the color resist layer may include a plurality of light shielding structures, and the light shielding structure is located between two adjacent light emitting elements 10, that is, the light shielding structure may fill the gap between two adjacent light emitting elements 10. The light shielding structure plays a light shielding role to prevent light from crosstalk. In addition, the light shielding structure may also fill the gap between the light emitting element 10 and the driving device 40.

[0045] The encapsulation layer is located on the side of the color resist layer away from the driving substrate 30, and the encapsulation layer can cover the color resist layer, the light emitting element 10 and the driving device 40. The encapsulation layer can effectively protect the light emitting element 10 and the driving device 40 from interference and damage from the external environment, and extend the service life of the two. By selecting suitable materials and structures for encapsulation, the light emitted by the light emitting element 10 can also be made more uniform, and the optical performance indicators such as brightness and color purity can be improved, thereby improving the display effect.

[0046] The display panel provided in the embodiment of the present invention may further include any film layer structure known to those skilled in the art, which is not limited in the embodiment of the present invention.

[0047] The display panel provided by the embodiment of the present invention includes a light-emitting element and a pixel driving circuit, wherein the pixel driving circuit is electrically connected to the light-emitting element; the display panel also includes a driving substrate and a driving device, wherein at least part of the driving device and the light-emitting element are located on the same side of the driving substrate, the driving device includes at least part of the structure of the pixel driving circuit, and the driving substrate includes at least part of the structure of the pixel driving circuit. By setting at least part of the structure in the pixel driving circuit in the driving device, the number of components and wiring structures in the driving substrate can be reduced, thereby eliminating the related processes of some film layers in the driving substrate, which is beneficial to reducing the number of masks when preparing the driving substrate, simplifying the mask process, and greatly reducing the manufacturing cost and difficulty of the driving substrate. In addition, it can also provide a larger layout space for the pixel driving circuit structure in the driving substrate, reducing the difficulty of wiring in the driving substrate.

[0048] Optionally, in a possible embodiment, the pixel driving circuit includes an active part and a passive part, at least part of the active part is located in the driving device, and at least part of the passive part is located in the driving substrate.

[0049] The active part refers to the part that requires external energy input to work normally. The active part can convert the energy form and play the role of providing energy and driving signals in the circuit; the passive part refers to the part that can work normally without external energy input. The passive part plays the role of transmitting signals, storing energy and adjusting circuit parameters in the circuit.

[0050] In this embodiment, the driving device may include at least part of the active part, and the driving substrate may include at least part of the passive part, so that the positions are divided according to the types of each structure of the pixel driving circuit, so that a larger number of active parts are concentrated in the driving device, and a larger number of passive parts are concentrated in the driving substrate.

[0051] Exemplarily, in some embodiments, the active part of the pixel driving circuit can be entirely disposed in the driving device, and the passive part can be entirely disposed in the driving substrate, thereby optimizing the structural layout in the pixel driving circuit and avoiding mutual interference between the active part and the passive part.

[0052] Further optionally, the active part includes a transistor or a semiconductor element, and the passive part includes a signal line or a capacitor.

[0053] The active part may also be referred to as an active component, including but not limited to semiconductor components such as transistors, diodes or triodes, and the passive part includes but not limited to passive components such as capacitors, resistors, and structures such as signal routing.

[0054] In several embodiments shown below, the passive part of the pixel driving circuit includes signal wiring and capacitors, and the signal wiring and capacitors are formed in the driving substrate.

[0055] For example, please refer to Figure 3 and Figure 4 The driving substrate 30 includes a base substrate 300 and a multi-layer metal layer 302 stacked on one side of the base substrate 300; the driving substrate 30 also includes a plurality of signal lines 303, the signal lines 303 include a plurality of first signal lines 3031 and a plurality of second signal lines 3032; the first signal lines 3031 include power supply voltage signal lines; at least part of the first signal lines 3031 are located in the metal layer 302 on the side of the metal layer 302 where the second signal lines 3032 are located away from the base substrate 300.

[0056] like Figure 3 and Figure 4 As shown, the first signal line 3031 and the second signal line 3032 are signal lines for transmitting different types of voltage signals. At least part of the first signal line 3031 may include a power supply voltage signal line for transmitting a fixed voltage signal, and at least part of the second signal line 3032 may include a scanning signal line for transmitting a jump voltage signal. The first signal line 3031 is electrically connected to the driving device 40 and / or the light emitting element 10, and the second signal line 3032 may be electrically connected to the driving device 40.

[0057] like Figure 4 As shown, the present embodiment defines that at least part of the first signal lines 3031 are located in the same metal layer 302, at least part of the second signal lines 3032 are located in the same metal layer 302, and at least part of the first signal lines 3031 and at least part of the second signal lines 3032 are located in different metal layers 302. In this way, the signal lines 303 for transmitting different types of signals can be located in different metal layers 302, thereby avoiding interference between signals.

[0058] Furthermore, the present embodiment also proposes that at least part of the metal layer 302 where the first signal line 3031 is located is located on the side of the metal layer 302 where the second signal line 3032 is located away from the base substrate 300. In other words, at least part of the metal layer 302 where the first signal line 3031 is located is located in the metal layer 302 close to the light emitting element 10, and at least part of the metal layer 302 where the second signal line 3032 is located is located on the side of the metal layer 302 where the first signal line 3031 is located away from the light emitting element 10. Along the thickness direction Z of the driving substrate, at least part of the metal layer 302 where the first signal line 3031 is located is located between at least part of the metal layer 302 where the second signal line 3032 is located and the light emitting element 10.

[0059] Under this setting, signal crosstalk between the first signal line 3031 and the second signal line 3032 can be avoided to ensure accurate signal transmission. In addition, since part of the first signal line 3031 is electrically connected to the light-emitting element 10, the first signal line 3031 is set in the metal layer 302 on the side close to the light-emitting element 10, which can also reduce the difficulty of connecting the first signal line 3031 and the light-emitting element 10.

[0060] For example, please refer to Figure 3 and Figure 4 In some embodiments, the first signal line 3031 includes a first power supply voltage signal line PVDD and a second power supply voltage signal line PVEE, and the second signal line 3032 includes a first scan signal line S1, a second scan signal line S2, and a light emitting control signal line EM. The light emitting element 10 includes a first electrode 101, a second electrode 102, and a light emitting body 103 connected between the first electrode 101 and the second electrode 102. The driving device 40 may include elements such as transistors, and the driving device 40 may be electrically connected to the first electrode 101 of the light emitting element 10 through the auxiliary conductive portion 400, the driving device connecting portion 301, and a portion of the signal wiring 303.

[0061] The first power supply voltage signal line PVDD can be electrically connected to the driving device 40, and is used to transmit the first power supply voltage signal to the transistor in the driving device 40. The second power supply voltage signal line PVEE is electrically connected to the second electrode 102 of the light-emitting element 10, and is used to transmit the second power supply voltage signal to the light-emitting element 10. The first scanning signal line S1, the second scanning signal line S2 and the light-emitting control signal line EM are respectively electrically connected to the transistor in the driving device 40 to transmit the required scanning control signal to the corresponding transistor. The above-mentioned second signal line 3032 can be electrically connected to the corresponding circuit structure through the auxiliary conductive part 400 of the driving device 40. The circuit structure such as the transistor in the driving device 40 generates a driving current under the driving control of various signals. When the driving current is transmitted to the first electrode 101 and the second power supply voltage signal is transmitted to the second electrode 102, the light-emitting element 10 emits light.

[0062] For example, please refer to Figure 3 and Figure 4 In some embodiments, the multilayer metal layer 302 includes a first metal layer 3021, a second metal layer 3022, a third metal layer 3023 and a fourth metal layer 3024 stacked in sequence along the direction of the base substrate 300 pointing to the light-emitting element 10; the first scanning signal line S1, the second scanning signal line S2 and the light-emitting control signal line EM are located in the first metal layer 3021, the first power supply voltage signal line PVDD is located in the third metal layer 3023; the second power supply voltage signal line PVEE is located in the fourth metal layer 3024.

[0063] Figure 3 and Figure 4 In the illustrated embodiment, the driving substrate 30 includes four metal layers stacked in sequence, the first metal layer 3021 is close to the base substrate 300, and the fourth metal layer 3024 is close to the light emitting element 10. The first scanning signal line S1, the second scanning signal line S2, and the light emitting control signal line EM can be arranged in the first metal layer 3021, the first power supply voltage signal line PVDD can be arranged in the third metal layer 3023, and the second power supply voltage signal line PVEE can be arranged in the fourth metal layer 3024.

[0064] As described above, the second power supply voltage signal line PVEE is electrically connected to the light emitting element 10, and setting it in the fourth metal layer 3024 can reduce the difficulty of connecting the second power supply voltage signal line PVEE with the second electrode 102 of the light emitting element 10. Setting the first power supply voltage signal line PVDD and the second power supply voltage signal line PVEE in different film layers is conducive to reducing the number of wirings in the third metal layer 3023 and the fourth metal layer 3024, and reducing the difficulty of wiring.

[0065] You can continue to refer to Figure 4 The driving substrate 30 also includes a capacitor C, which includes a first electrode plate C1 and a second electrode plate C2 that are arranged opposite to each other. The first electrode plate C1 and the second electrode plate C2 can be arranged in any two metal layers among the four metal layers. Figure 4 As shown, the first electrode plate C1 is disposed on the first metal layer 3021 , and the second electrode plate C2 is disposed on the second metal layer 3022 , but the present invention is not limited thereto.

[0066] For example, Figure 5 A schematic diagram of the structure of another display panel provided by an embodiment of the present invention, Figure 6 for Figure 5 Schematic diagram of the cross-sectional structure along the B-B' direction, Figure 5 The following is a partial cross-sectional diagram of the display panel. Figure 5 and Figure 6 In other embodiments, the multilayer metal layer 302 includes a first metal layer 3021, a second metal layer 3022 and a third metal layer 3023 which are stacked in sequence along the direction of the base substrate 300 pointing to the light-emitting element 10; the first signal line 3031 includes a first power supply voltage signal line PVDD and a second power supply voltage signal line PVEE, and the second signal line 3032 includes a first scan signal line S1, a second scan signal line S2 and a light-emitting control signal line EM; the first scan signal line S1, the second scan signal line S2 and the light-emitting control signal line EM are located in the first metal layer 3021, and the first power supply voltage signal line PVDD is located in the second metal layer 3022; the second power supply voltage signal line PVEE is located in the third metal layer 3023.

[0067] Figure 5and Figure 6 In the illustrated embodiment, the driving substrate 30 includes three metal layers stacked in sequence, the first metal layer 3021 is close to the base substrate 300, and the third metal layer 3023 is close to the light emitting element 10. The first scanning signal line S1, the second scanning signal line S2, and the light emitting control signal line EM can be arranged in the first metal layer 3021, the first power supply voltage signal line PVDD can be arranged in the second metal layer 3022, and the second power supply voltage signal line PVEE can be arranged in the third metal layer 3023. In this embodiment, by reducing one metal layer 302, the thickness of the driving substrate 30 can be reduced to ensure that the display panel is light and thin.

[0068] Accordingly, Figure 5 and Figure 6 In the embodiment, the first plate C1 and the second plate C2 of the capacitor C can be arranged in any two metal layers of the three metal layers. Figure 5 As shown, the first electrode plate C1 is disposed on the first metal layer 3021 , and the second electrode plate C2 is disposed on the second metal layer 3022 , but the present invention is not limited thereto.

[0069] Figure 4 and Figure 5 In the illustrated embodiment, the driving substrate 30 only includes part of the signal lines 303 and the capacitor C in the pixel driving circuit 20 , and no transistor-related process is required, which can further reduce the manufacturing cost and process difficulty of the driving substrate 30 .

[0070] The film layers where the above-mentioned signal wirings 303 are located are only examples. In actual application, the positions of the film layers where the signal wirings 303 are located can be adjusted according to actual needs.

[0071] Optional, Figure 7 A schematic diagram of the structure of another display panel provided in an embodiment of the present invention can be referred to Figure 7 The driving substrate 30 also includes a plurality of side wirings 304, the side wirings 304 are close to the edge of the driving substrate 30, and the side wirings 304 are used to lead out the signal wirings 303 located in the display area, thereby binding the signal wirings 303 to a signal supply unit such as a driving chip (not shown in the figure). The side wirings 304 may be located in at least one metal layer 302 of the driving substrate 30, for example, in the first metal layer 3021 and / or the second metal layer 3022.

[0072] Further, in Figure 7In the illustrated embodiment, the driving substrate 30 also includes a binding pad 305, which is close to the edge of the driving substrate 30. Along the thickness direction Z of the driving substrate, the binding pad 305 is located on the side of the metal layer 302 where the side trace 304 is located away from the base substrate 300 and overlaps with the side trace 304. The binding pad 305 is electrically connected to the side trace 304, and the side trace 304 is electrically connected to the driving chip, etc. through the binding pad 305.

[0073] For example, the bonding pad 305 may be located at the fourth metal layer 3024 (corresponding to Figure 4 Alternatively, the bonding pad 305 may be located at the third metal layer 3023 (corresponding to Figure 5 Three-layer metal layer scheme shown).

[0074] Figure 8 A schematic diagram of the structure of another display panel provided by an embodiment of the present invention, Figure 8 In the illustrated embodiment, the driving substrate 30 includes a first surface 30A and a second surface 30B that are arranged opposite to each other, and a side surface connecting the first surface 30A and the second surface 30B. The first surface 30A is located between the second surface 30B and the light-emitting element 10, and the light-emitting element 10 and the driving device 40 are located on the first surface 30A. The side wiring 304 extends from the first surface 30A to the second surface 30B through the side surface, and is bound to a driving chip (not shown in the figure) on one side of the second surface 30B. In this way, a borderless display panel can be realized, and a large-size display device can be obtained by splicing multiple borderless display panels.

[0075] The side of the side wiring 304 facing away from the driving substrate 30 may further include a packaging structure, and the packaging structure covers the side wiring 304 to protect the side wiring 304 .

[0076] The embodiments of the present invention do not limit the specific process of driver chip binding, and those skilled in the art can design it according to actual needs. Any existing binding process is within the scope of the technical solution protected by the embodiments of the present invention.

[0077] Optional, you can continue to refer to Figure 3 and Figure 4 The driving substrate 30 also includes a light-emitting element connecting portion 306 and a driving device connecting portion 301; the light-emitting element connecting portion 306 is used to electrically connect the light-emitting element 10 and the pixel driving circuit 20; the driving device connecting portion 301 is used to electrically connect the driving device 40 and the light-emitting element 10, and / or electrically connect the driving device 40 and a partial structure of the pixel driving circuit 20 in the driving substrate 30; wherein the light-emitting element connecting portion 306 and the driving device connecting portion 301 are on the same layer.

[0078] The driver device connection portion 301 has been introduced in the above embodiment and will not be described again here. In this embodiment, the side of the driver substrate 30 close to the light emitting element 10 may also include a plurality of light emitting element connection portions 306, and the light emitting element connection portions 306 bind the light emitting element 10 to the driver substrate 30, thereby realizing the electrical connection between the light emitting element 10 and the circuit structure (such as the second power supply voltage signal line PVEE) in the driver substrate 30, and the electrical connection between the light emitting element 10 and the circuit structure (such as a transistor) in the driver device 40.

[0079] When the driving device 40 is electrically connected to the light-emitting element 10, the driving device 40 needs to be connected to the first electrode 101 of the light-emitting element 10 through its own auxiliary conductive part 400, the driving device connecting part 301, the internal signal line 303 of the driving substrate 30 (the signal line 303 connecting the driving device connecting part 301 and the light-emitting element connecting part 306) and the light-emitting element connecting part 306.

[0080] The light emitting element connection part 306 may include a first connection part 3061 and a second connection part 3062, which are independently arranged. The first connection part 3061 is electrically connected to the driving device connection part 301, and the second connection part 3062 is electrically connected to the second power supply voltage signal line PVEE. Figure 4 The connection manner shown between the light emitting element connection portion 306 and the driving device connection portion 301 and the signal wiring 303 in the driving substrate 30 is only an example and does not represent the actual connection situation.

[0081] Furthermore, if Figure 4 or Figure 6 As shown, the light emitting element connection portion 306 and the driving device connection portion 301 may be located in the same conductive layer of the driving substrate 30 , and may be located in the conductive layer of the driving substrate 30 that is closest to the light emitting element 10 .

[0082] For example, for Figure 4 For the embodiment shown, the light emitting element connection portion 306 and the driving device connection portion 301 may be located at the fourth metal layer 3024; Figure 6 For the embodiment shown, the light emitting element connection portion 306 and the driving device connection portion 301 may be located at the third metal layer 3023. In an embodiment not shown in the drawings of the present invention, the driving substrate 30 may further include a eutectic layer, which is located on the side of the multi-layer metal layer 302 away from the base substrate 300, for example Figure 4 In the four-metal layer solution shown in FIG. 1 , the eutectic layer may be located on the side of the fourth metal layer 3024 facing away from the substrate 300. Figure 6 In the three-metal layer solution shown, the eutectic layer may be located on the side of the third metal layer 3023 facing away from the substrate 300. The light emitting element connection portion 306 and the driving device connection portion 301 may be located in the eutectic layer.

[0083] Optional, Fig. 9 A schematic diagram of a pixel driving circuit provided in an embodiment of the present invention can be used in conjunction with reference to Figure 3 , Figure 4 and Fig. 9 In a possible embodiment, the pixel driving circuit 20 may include a driving module 201, a light-emitting control module 202, a data writing module 203, a storage module 204 and a plurality of signal lines 303, the driving module 201 is electrically connected to the light-emitting control module 202, the data writing module 203 and the storage module 204 respectively; the signal line 303 includes a first power supply voltage signal line PVDD and a second power supply voltage signal line PVEE, the first power supply voltage signal line PVDD is electrically connected to the light-emitting control module 202, and the second power supply voltage signal line PVEE is electrically connected to the second electrode 102 of the light-emitting element 10; at least part of the structure of the driving module 201, at least part of the structure of the light-emitting control module 202, and at least part of the structure of the data writing module 203 are located in the driving device 40, and at least part of the structure of the storage module 204, the first power supply voltage signal line PVDD and the second power supply voltage signal line PVEE are located in the driving substrate 30.

[0084] like Figure 3 , Figure 4 and Fig. 9 As shown, the data writing module 203 is used to transmit a data signal to the driving module 201, so as to write or update the display data in the pixel driving circuit 20. The driving module 201 is used to output a driving current according to the data signal to drive the light-emitting element 10 to emit light. The light-emitting control module 202 is used to control the driving current generated by the driving module 201 to be transmitted to the light-emitting element 10, so as to achieve precise control of the brightness and duration of the pixel light emission. The storage module 204 is used to store the data signal written to the driving module 201 to maintain the stability of the pixel driving circuit 20 during the display process.

[0085] The driving module 201 , the light emitting control module 202 and the data writing module 203 may respectively include transistors, the storage module 204 may include a capacitor C, the driving module 201 , the light emitting control module 202 and the data writing module 203 may be formed in the driving device 40 , and the capacitor C may be formed in the driving substrate 30 .

[0086] The first power supply voltage signal line PVDD and the second power supply voltage signal line PVEE are the same as those in the above embodiment and will not be described in detail herein. Figure 3 , Figure 4 and Fig. 9As shown, the first plate C1, the second plate C2 and the first power supply voltage signal line PVDD of the capacitor C are all located in the driving substrate 30, the first plate C1 is electrically connected to the first power supply voltage signal line PVDD, and the second plate C2 is electrically connected to the data writing module 203 in the driving device 40.

[0087] Exemplarily, when the first electrode plate C1 and the first power supply voltage signal line PVDD are arranged in different layers, the two can be electrically connected through the punched holes between the metal layers 302; when the first electrode plate C1 and the first power supply voltage signal line PVDD are arranged in the same layer, the two can be directly electrically connected. The second electrode plate C2 is connected to the data writing module 203 in the driver device 40 through the punched holes of the upper metal layer 302, the driver device connection part 301, and the auxiliary conductive part 400.

[0088] Further, the structure of the pixel driving circuit 20 is described in detail below by taking a 7T1C pixel driving circuit 20 as an example, wherein "T" represents a transistor and "C" represents a capacitor C. The actual pixel driving circuit 20 is not limited to a 7T1C structure, and a 13T2C or 15T3C structure is also applicable to the embodiments of the present invention.

[0089] For example, continue to refer to Figure 3 , Figure 4 and Fig. 9, the light-emitting control module 202 includes a first transistor T1 and a second transistor T2, the driving module 201 includes a third transistor T3, the data writing module 203 includes a fourth transistor T4, and the storage module 204 includes a capacitor C; the pixel driving circuit 20 also includes a compensation module and a reset module, the compensation module includes a fifth transistor T5, and the reset module includes a sixth transistor T6 and a seventh transistor T7; the first transistor T1, the second transistor T2, the third transistor T3, the fourth transistor T4, the fifth transistor T5, the sixth transistor T6 and the seventh transistor T7 are all located in the driving device 40, and the capacitor C is located in the driving substrate 30; the signal wiring 303 also includes a data signal line Data, a reset signal line Vref, a first scanning signal line S1, a second scanning signal line S2 and a light-emitting control signal line EM located in the driving substrate 30; the gates of the first transistor T1 and the second transistor T2 are electrically connected to the light-emitting control signal line EM, the first electrode of the first transistor T1 is electrically connected to the first power supply voltage signal line PVDD, the second electrode of the first transistor T1 is electrically connected to the first electrode of the third transistor T3; the first electrode of the second transistor T2 is electrically connected to the first electrode of the third transistor T3 The gate of the fourth transistor T4 is electrically connected to the first scanning signal line S1, the first electrode of the fourth transistor T4 is electrically connected to the data signal line Data, and the second electrode of the fourth transistor T4 is electrically connected to the first electrode of the third transistor T3; the gate of the fifth transistor T5 is electrically connected to the first scanning signal line S1, the first electrode of the fifth transistor T5 is electrically connected to the gate of the third transistor T3, and the second electrode of the fifth transistor T5 is electrically connected to the second electrode of the third transistor T3; the sixth transistor T6 is electrically connected to the first scanning signal line S1, the first electrode of the fifth transistor T5 is electrically connected to the gate of the third transistor T3, and the second electrode of the fifth transistor T5 is electrically connected to the second electrode of the third transistor T3; The gate of the sixth transistor T6 is electrically connected to the second scanning signal line S2, the first electrode of the sixth transistor T6 is electrically connected to the reset signal line Vref, and the second electrode of the sixth transistor T6 is electrically connected to the gate of the third transistor T3; the gate of the seventh transistor T7 is electrically connected to the first scanning signal line S1, the first electrode of the seventh transistor T7 is electrically connected to the reset signal line Vref, and the second electrode of the seventh transistor T7 is electrically connected to the second electrode of the second transistor T2; the first plate C1 of the capacitor C is electrically connected to the first power supply voltage signal line PVDD, and the second plate C2 of the capacitor C is electrically connected to the gate of the third transistor T3.

[0090] like Figure 3 , Figure 4 and Fig. 9 As shown, the pixel driving circuit 20 includes 7 transistors (T1-T7) and 1 capacitor C, wherein the 7 transistors are all located in the driving device 40. The pixel driving circuit 20 also includes a data signal line Data and a reset signal line Vref, and the data signal line Data and the reset signal line Vref and the several signal wirings 303 mentioned above are all located in the driving substrate 30.

[0091] The gates of the first transistor T1 and the second transistor T2 receive the light-emitting control signal transmitted by the light-emitting control signal line EM, and are turned on or off under the control of the light-emitting control signal. The first electrode of the first transistor T1 is electrically connected to the first power supply voltage signal line PVDD, and the second electrode of the second transistor T2 is electrically connected to the first electrode 101 of the light-emitting element 10. In combination with the above, the first transistor T1 and the second transistor T2 are electrically connected to the corresponding structure in the driving substrate 30 through the auxiliary conductive part 400 of the driving device 40 and the driving device connecting part 301. The third transistor T3 is connected between the first transistor T1 and the second transistor T2, and the gate of the third transistor T3 is electrically connected to the second electrode plate C2 of the capacitor C. Among them, the gate of the third transistor T3 can be electrically connected to the second electrode plate C2 through the auxiliary conductive part 400 of the driving device 40 and the driving device connecting part 301.

[0092] The gate of the fourth transistor T4 receives the first scanning signal transmitted by the first scanning signal line S1, and is turned on or off under the control of the first scanning signal. The first electrode of the fourth transistor T4 receives the data signal transmitted by the data signal line Data, and the second electrode is electrically connected to the first electrode of the third transistor T3. The gate and the first electrode of the third transistor T3 can be electrically connected to the corresponding structure in the driving substrate 30 through the auxiliary conductive part 400 of the driving device 40 and the driving device connecting part 301.

[0093] The gate of the fifth transistor T5 receives the first scan signal transmitted by the first scan signal line S1, and is turned on or off under the control of the first scan signal. The first electrode of the fifth transistor T5 is connected to the gate of the third transistor T3, and the second electrode is connected to the second electrode of the third transistor T3. The fifth transistor T5 is used to compensate for the threshold voltage offset of the third transistor T3 and improve the driving current stability. Among them, the gate of the fifth transistor T5 can be electrically connected to the first scan signal line S1 through the auxiliary conductive part 400 of the driving device 40 and the driving device connecting part 301.

[0094] The gate of the sixth transistor T6 receives the second scanning signal transmitted by the second scanning signal line S2, and is turned on or off under the control of the second scanning signal. The first electrode of the sixth transistor T6 receives the reset signal transmitted by the reset signal line Vref, and the second electrode is connected to the gate of the third transistor T3. The sixth transistor T6 is used to reset the gate of the third transistor T3 in the reset stage. The gate and the first electrode of the sixth transistor T6 can be electrically connected to the corresponding structure in the driving substrate 30 through the auxiliary conductive part 400 of the driving device 40 and the driving device connecting part 301.

[0095] The gate of the seventh transistor T7 receives the first scanning signal transmitted by the first scanning signal line S1, and is turned on or off under the control of the first scanning signal. The first electrode of the seventh transistor T7 receives the reset signal transmitted by the reset signal line Vref, and the second electrode is connected to the second electrode of the second transistor T2. The seventh transistor T7 is used to reset the first electrode 101 of the light-emitting element 10 in the reset stage. The gate and the first electrode of the seventh transistor T7 can be electrically connected to the first scanning signal line S1 through the auxiliary conductive part 400 of the driving device 40 and the driving device connecting part 301.

[0096] Among the first transistor T1 to the seventh transistor T7 , the transistors electrically connected to the same signal trace 303 can be connected to the same driver device connection portion 301 through the same auxiliary conductive portion 400 , thereby reducing the number of auxiliary conductive portions 400 and driver device connection portions 301 .

[0097] Optional, you can continue to refer to Figure 2-Figure 4 The display panel includes a display area AA and a non-display area NA surrounding at least a portion of the display area AA, and the light emitting element 10 is located in the display area AA; the driving device 40 includes a first driving device 401, and the first driving device 401 is located in the display area AA.

[0098] like Figure 2-Figure 4 As shown, in this embodiment, at least part of the driving device 40 is located in the display area AA, and the driving device 40 located in the display area AA is defined as the first driving device 401. The first driving device 401 is arranged in the display area AA, which is conducive to reducing the difficulty of connecting the first driving device 401 with its corresponding light-emitting element 10.

[0099] Optionally, in other embodiments, the driving device 40 may further include a second driving device (not shown in the figure), and the second driving device is located in the non-display area NA. Setting the second driving device in the non-display area NA can reduce the number of driving devices 40 in the display area AA, thereby reducing the space occupied by the driving device 40 in the display area AA, deploying more light-emitting elements 10, and achieving high PPI.

[0100] Optional, Fig.10 A structural schematic diagram of another display panel provided for an embodiment of the present invention can be referred to 10. In a possible embodiment, the display panel may include multiple first light-emitting units 501, and the first light-emitting unit 501 includes multiple light-emitting elements 10 with different light-emitting colors; in the same first light-emitting unit 501, a first driving device 401 is electrically connected to the multiple light-emitting elements 10.

[0101] like Fig.10As shown, in this embodiment, the display panel may include a plurality of first light-emitting units 501 arranged in an array, and the first light-emitting unit 501 includes light-emitting elements 10 with different light-emitting colors. For example, in some embodiments, the first light-emitting unit 501 may include a red light-emitting element 10R, a green light-emitting element 10G, and a blue light-emitting element 10B, and the red light-emitting element 10R emits red light, the green light-emitting element 10G emits green light, and the blue light-emitting element 10B emits blue light. The three colors of red, green, and blue are combined to emit light to achieve full-color display.

[0102] Among them, Fig.10 In the illustrated embodiment, a plurality of light emitting elements 10 in a first light emitting unit 501 are electrically connected to the same first driving device 401 and receive the driving current transmitted by the same first driving device 401. Fig.10 As shown, in the same first light-emitting unit 501, the red, green and blue light-emitting elements 10 correspond to the same first driving device 401. The same first driving device 401 can be integrated with a circuit structure of a pixel driving circuit corresponding to a plurality of light-emitting elements 10, so that the red, green and blue light-emitting elements 10 are driven by one first driving device 401. In this arrangement, the number of first driving devices 401 is small, and the flexibility of the layout position of the first driving device 401 is high.

[0103] For example, Fig. 9 Taking the example that the seven transistors in the pixel driving circuit shown are located in the driving device 40, the first driving device 401 may include multiple transistors in three pixel driving circuits. For example, the first driving device 401 may include a first driving circuit, a second driving circuit and a third driving circuit. The second transistor T2 in the first driving circuit is electrically connected to the first electrode of the red light emitting element 10R, the second transistor T2 in the second driving circuit is electrically connected to the first electrode of the green light emitting element 10G, and the second transistor T2 in the third driving circuit is electrically connected to the first electrode of the blue light emitting element 10B. The second transistor T2 in each pixel driving circuit is electrically connected to the corresponding light emitting element 10 through the corresponding auxiliary conductive portion and the driving device connecting portion.

[0104] Optional, Fig.11 A schematic diagram of the structure of another display panel provided in an embodiment of the present invention can be referred to Fig.11 In another possible embodiment, the display panel includes a plurality of second light-emitting units 502, and the second light-emitting unit 502 includes a plurality of light-emitting elements 10 with different light-emitting colors; in the same second light-emitting unit 502, the first driving device 401 is electrically connected to the light-emitting element 10 in a one-to-one correspondence.

[0105] like Fig.11As shown, in this embodiment, the display panel may include a plurality of second light-emitting units 502 arranged in an array, and the second light-emitting unit 502 includes light-emitting elements 10 with different light-emitting colors. For example, the second light-emitting unit 502 may include a red light-emitting element 10R, a green light-emitting element 10G and a blue light-emitting element 10B.

[0106] Among them, Fig.11 In the illustrated embodiment, a plurality of light-emitting elements 10 in a second light-emitting unit 502 are arranged in one-to-one correspondence with a plurality of first driving devices 401, and the plurality of light-emitting elements 10 are electrically connected to the first driving devices 401 to receive the driving current transmitted by the corresponding first driving devices 401. Fig.11 As shown, in the same first light-emitting unit 501, the red, green and blue light-emitting elements 10B correspond to three first driving devices 401. For the first driving device 401 corresponding to the second light-emitting unit 502, a pixel driving circuit structure corresponding to one light-emitting element 10 is provided in one first driving device 401, so that the red, green and blue light-emitting elements 10 are driven respectively by different first driving devices 401. Under this setting mode, the internal structure of the first driving device 401 is relatively simple, and one first driving device 401 only drives the light-emitting element 10 of the corresponding color, and the driving logic of the pixel driving circuit is relatively simple.

[0107] Exemplarily, the first driving device 401 corresponding to the same second light-emitting unit 502 includes a red driving device 40R, a green driving device 40G and a blue driving device 40B. The red driving device 40R, the green driving device 40G and the blue driving device 40B respectively include a plurality of transistors in a pixel driving circuit. The red driving device 40R is electrically connected to the red light-emitting element 10R to provide the required driving current to the red light-emitting element 10R; the green driving device 40G is electrically connected to the green light-emitting element 10G to provide the required driving current to the green light-emitting element 10G; the blue driving device 40B is electrically connected to the blue light-emitting element 10B to provide the required driving current to the blue light-emitting element 10B.

[0108] In an embodiment not shown in the present invention, the display panel may include a first light-emitting unit 501 and a second light-emitting unit 502 at the same time. The first driving device 401 includes a first sub-driving device and a second sub-driving device. The first sub-driving device includes a circuit structure of multiple pixel driving circuits, and one first sub-driving device 40 is electrically connected to multiple light-emitting elements 10 in the first light-emitting unit 501. The second sub-driving device includes a circuit structure of a pixel driving circuit, and multiple second sub-driving devices are electrically connected to multiple light-emitting elements 10 in the second light-emitting unit 502 in a one-to-one correspondence.

[0109] You can continue to refer to Fig.10 or Fig.11 The display panel includes a plurality of light emitting units 50, and the light emitting units 50 include a plurality of light emitting elements 10 arranged along a first direction X; the first driving device 401 is located on one side of the corresponding light emitting unit 50 along a second direction Y, wherein the first direction X intersects with the second direction Y.

[0110] The light emitting unit 50 may refer to the first light emitting unit 501 or the second light emitting unit 502. A plurality of light emitting units 50 may be arranged in an array along a first direction X and a second direction Y. Fig.10 and Fig.11 Only one light-emitting unit 50 is shown in the figure, and it should be known that the display panel includes a plurality of light-emitting units 50 arranged in an array. The first direction X may be the row direction of the light-emitting unit 50, and the second direction Y may be the column direction of the light-emitting unit 50, but is not limited thereto. A plurality of light-emitting elements 10 of different colors in the same light-emitting unit 50 may be arranged along the first direction X. The first driving device 401 connected to the plurality of light-emitting elements 10 in the light-emitting unit 50 is located on one side of the light-emitting unit 50 along the second direction Y.

[0111] In this way, the distances between the first driving device 401 and the multiple light-emitting elements 10 electrically connected to it are relatively close, and the lengths of the connecting wires between the first driving device 401 and each light-emitting element 10 are relatively consistent, which can reduce the wiring difficulty and ensure the uniformity of the length of the driving current transmission path, thereby improving the uniformity of the luminous brightness of different light-emitting elements 10 in the same light-emitting unit 50.

[0112] For reference Figure 3 In some embodiments, the light emitting unit 50 may include a plurality of light emitting elements 10 arranged along the second direction Y, and the first driving device 401 may be located on one side of the corresponding light emitting unit 50 along the second direction Y. In this way, the arrangement of the light emitting element 10 and the first driving device 401 is relatively regular, which can reduce the difficulty of the alignment transfer of the light emitting element 10 and the driving device 40.

[0113] Optional, you can continue to refer to Fig.10 In a possible embodiment, the pixel driving circuit 20 includes an active part and a passive part, at least part of the active part is located in the first driving device 401, and at least part of the passive part is located in the driving substrate 30; in the orthographic projection figure of the plane where the driving substrate 30 is located, the first driving device 401 is located between the partial structure of the passive part and the light-emitting element 10.

[0114] Referring to the above description of the active part and the passive part, the active part includes semiconductor elements such as transistors, and the passive part includes structures such as capacitor C and signal wiring 303. In this embodiment, the position of the first driving device 401 is described. Fig.10As shown, the orthographic projection of the first driving device 401 on the plane where the driving substrate 30 is located is between the orthographic projection of the passive part of the structure and the orthographic projection of the light-emitting element 10 on the plane where the driving substrate 30 is located. In other words, in the orthographic projection figure of the plane where the driving substrate 30 is located, part of the active part of the pixel driving circuit 20 is located between part of the passive part and the light-emitting element 10.

[0115] Based on the connection relationship between the pixel driving circuit 20 and the light emitting element 10, in general, the active part in the pixel driving circuit 20 needs to be electrically connected to the light emitting element 10 and the passive part in the driving substrate 30. The orthographic projection of the first driving device 401 is set between the orthographic projection of the light emitting element 10 and the orthographic projection of part of the passive part, so that the spacing between the first driving device 401 and the light emitting element 10, and the spacing between the first driving device 401 and part of the passive part are relatively small, thereby reducing the difficulty of connecting the active part in the first driving device 401 with the light emitting element 10 and the passive part.

[0116] For example, continue to refer to Fig.10 , the passive part includes a capacitor C; in the orthographic projection diagram of the plane where the driving substrate 30 is located, the first driving device 401 is located between the capacitor C and the light-emitting element 10.

[0117] Since the capacitor C does not need to be directly electrically connected to the light emitting element 10, the orthographic projection of the capacitor C on the plane where the driving substrate 30 is located can be set to be located on the side of the orthographic projection of the first driving device 401 away from the orthographic projection of the light emitting element 10, ensuring that the distance between the first driving device 401 and the light emitting element 10 and the capacitor C is small.

[0118] You can continue to refer to Fig.10 In some embodiments, the passive portion may include a signal line 303 , and in an orthographic projection diagram on the plane where the driving substrate 30 is located, the first driving device 401 is located between a portion of the signal line 303 and the light emitting element 10 .

[0119] For example, Fig.10 As shown, the signal line 303 includes a first power supply voltage signal line PVDD. As described in the above embodiment, the first power supply voltage signal line PVDD is electrically connected to the first transistor in the first driving device 401 and the capacitor C in the driving substrate 30. It can be arranged in an orthographic projection pattern on the plane where the driving substrate 30 is located, the first driving device 401 is located between the first power supply voltage signal line PVDD and the light-emitting element 10, and the capacitor C is located between the first driving device 401 and the first power supply voltage signal line PVDD. Reduce the connection difficulty of each structure in the pixel driving circuit 20.

[0120] You can continue to refer to Fig.10 or Fig.11The display panel includes a plurality of light-emitting units 50, the light-emitting units 50 include a plurality of light-emitting elements 10 arranged along a first direction X; the display panel also includes a plurality of second signal line groups, the second signal line groups include a plurality of second signal lines 3032 extending along the first direction X and arranged along a second direction Y, wherein the first direction X intersects with the second direction Y; the orthographic projection of the first driving device 401 on the plane where the driving substrate 30 is located overlaps with the orthographic projection of the second signal line group on the plane where the driving substrate 30 is located.

[0121] The second signal line group may include a first scan signal line S1, a second scan signal line S2, and a light emitting control signal line EM for transmitting a jump voltage signal. As described above, the first scan signal line S1, the second scan signal line S2, and the light emitting control signal line EM may be located in the first metal layer 3021. The second signal line group may also include a signal routing line 303, such as a reset signal line Vref, which is also located in the first metal layer 3021, but is not limited thereto.

[0122] The second signal lines 3032 extend along the first direction X and are arranged along the second direction Y. The plurality of first driving devices 401 arranged along the first direction X can be electrically connected to the same first scan signal line S1, the same second scan signal line S2, the same light emitting control signal line EM and the same reset signal line Vref, respectively.

[0123] In combination with the connection relationship of the pixel driving circuit described above, the second signal lines 3032 are electrically connected to the plurality of transistors in the first driving device 401. Fig.10 or Fig.11 As shown, the orthographic projection of the first driving device 401 on the plane where the driving substrate 30 is located overlaps with the orthographic projection of at least part of the second signal lines 3032 in the second signal line group on the plane where the driving substrate 30 is located. In this way, the second signal lines 3032 in the driving substrate 30 can be directly punched upward to connect to the driving device connection portion 301, thereby being electrically connected to the first driving device 401, thereby simplifying the circuit structure.

[0124] Optional, you can continue to refer to Fig.10 or Fig.11 The driving substrate 30 also includes a power supply voltage signal line, and the orthographic projection of the power supply voltage signal line on the plane where the driving substrate 30 is located is outside the orthographic projection of the light emitting element 10 and the first driving device 401 on the plane where the driving substrate 30 is located.

[0125] The power supply voltage signal line includes a first power supply voltage signal line PVDD and a second power supply voltage signal line PVEE. The electrical connection relationship between the first power supply voltage signal line PVDD and the second power supply voltage signal line PVEE can refer to the above embodiment, and will not be described in detail here. In this embodiment, in the projection figure of the plane where the driving substrate 30 is located, the power supply voltage signal line is located outside the light-emitting element 10 and the first driving device 401, or in other words, the positive projection of the power supply voltage signal line is located on at least one side of the positive projection of the light-emitting element 10 and the first driving device 401.

[0126] For example, three adjacent light emitting elements 10 with different colors constitute a light emitting unit 50, and the light emitting unit 50 and the first driving device 401 electrically connected thereto constitute a pixel group. The positive projection of the power supply voltage signal line may be located between adjacent pixel groups.

[0127] The power supply voltage signal line transmits a fixed voltage signal. Compared with the jump signal voltage signal line, the power supply voltage signal line is arranged between two adjacent pixel groups, which is beneficial to avoid signal crosstalk between adjacent pixel groups.

[0128] Among them, Fig.10 or Fig.11 As shown, the first power supply voltage signal line PVDD and the second power supply voltage signal line PVEE both extend along the first direction X and are arranged in the second direction Y. In the orthographic projection of the plane where the driving substrate 30 is located, the first power supply voltage signal line PVDD and the second power supply voltage signal line PVEE are respectively located on both sides of the pixel group along the second direction Y. Specifically, the first power supply voltage signal line PVDD is located on the side of the first driving device 401 away from the light emitting element 10, and the second power supply voltage signal line PVEE is located on the side of the light emitting element 10 away from the first driving device 401. It is convenient to connect the first power supply voltage signal line PVDD with the first driving device 401, and the second power supply voltage signal line PVEE with the light emitting element 10.

[0129] Fig.12 A schematic diagram of the structure of another display panel provided by an embodiment of the present invention, Fig.12 In the illustrated embodiment, the first power supply voltage signal line PVDD extends along the second direction Y and is arranged in the first direction X, and the second power supply voltage signal line PVEE extends along the first direction X and is arranged in the second direction Y. In this arrangement, in the orthographic projection graph of the plane where the driving substrate 30 is located, the first power supply voltage signal line PVDD is located on one side of the pixel group along the first direction X, and the second power supply voltage signal line PVEE is located on one side of the pixel group along the second direction Y.

[0130] Continue to refer Fig.10 or Fig.11, the light emitting element 10 and the data signal line Data in the pixel driving circuit 20 may be in a one-to-one correspondence. As shown in the figure, when the light emitting unit 50 includes three light emitting elements 10 of different colors, the data signal line Data may include a first data signal line DataR, a second data signal line DataG and a third data signal line DataB.

[0131] like Fig.10 As shown, when one first driving device 401 is electrically connected to three light-emitting elements 10 in the same light-emitting unit 50, one first driving device 401 includes a circuit structure of three pixel driving circuits. The first data signal line DataR, the second data signal line DataG, and the third data signal line DataB are electrically connected to the same first driving device 401. Specifically, the first data signal line DataR is electrically connected to the first driving circuit (not shown in the figure), and transmits the driving current required by the red light-emitting element 10R to the first driving circuit; the second data signal line DataR is electrically connected to the second driving circuit (not shown in the figure), and transmits the driving current required by the green light-emitting element 10G to the second driving circuit; the third data signal line DataB is electrically connected to the third driving circuit (not shown in the figure), and transmits the driving current required by the blue light-emitting element 10B to the third driving circuit.

[0132] like Fig.11 As shown, when three first driving devices 401 are electrically connected to three light-emitting elements 10 in the same light-emitting unit 50 in a one-to-one correspondence, a first driving device 401 includes a circuit structure of a pixel driving circuit. The first data signal line DataR, the second data signal line DataG, and the third data signal line DataB are electrically connected to the three first driving devices 401 in a one-to-one correspondence. Specifically, the first data signal line DataR is electrically connected to the pixel driving circuit in the red driving device 40R, and transmits the driving current required by the red light-emitting element 10R to the pixel driving circuit in the red driving device 40R; the second data signal line DataG is electrically connected to the pixel driving circuit in the green driving device 40G, and transmits the driving current required by the green light-emitting element 10G to the pixel driving circuit in the green driving device 40G; the third data signal line DataB is electrically connected to the pixel driving circuit 20 in the blue driving device 40B, and transmits the driving current required by the blue light-emitting element 10B to the pixel driving circuit 20 in the blue driving device 40B.

[0133] like Figure 10-12 As shown, the data signal line Data can extend along the second direction Y and be arranged in the first direction X. One data signal line Data can be electrically connected to the pixel driving circuit (first driving device 401) corresponding to the plurality of light emitting elements 10 arranged along the second direction Y. When the first power supply voltage signal line PVDD is arranged according to Fig.12As shown, when arranged along the second direction Y and extending in the first direction X, the first power voltage signal line PVDD and the data signal line Data are located in the same metal layer.

[0134] Optionally, in a possible embodiment, the driving substrate includes a passive driving substrate.

[0135] The passive driving substrate is usually composed of insulating materials and conductive materials, and a matrix structure is formed by a cathode and anode matrix. The manufacturing process of the passive driving substrate is relatively simple and the cost is low. In this embodiment, the driving substrate can be prepared by using a passive driving substrate, and the required pixel driving circuit structure is formed in the passive driving substrate by designing the signal routing layout in the passive driving substrate.

[0136] Optionally, in a possible embodiment, the driving device includes a bare chip.

[0137] A bare chip, also known as a die chip, refers to a single, unpackaged semiconductor chip that has been cut from a wafer. It contains a complete circuit but has not yet been packaged. Part of the structure of the pixel drive circuit in the driver device can be formed in the bare chip. The internal structure of the bare chip can be designed according to the specific setting method of the pixel drive circuit.

[0138] For example, as described in the above embodiment, the bare chip may include a plurality of transistors in the pixel driving circuit, and the transistors required to drive the light-emitting element to emit light are integrated into the bare chip.

[0139] Optional, Fig.13 A schematic diagram of the structure of another display panel provided in an embodiment of the present invention can be referred to Fig.13 In another possible embodiment, the driving device 40 may include a first type of driving device 402 and a second type of driving device 403 , the first type of driving device 402 includes a bare chip, and the second type of driving device 403 includes a silicon-based capacitor.

[0140] Different from the above embodiment, Fig.13 In the illustrated embodiment, the capacitor in the pixel driving circuit 20 can also be designed as the structure of the driving device 40 and bound to the first surface 30A of the driving substrate 30. In this way, no capacitor needs to be arranged in the driving substrate 30, which can further simplify the manufacturing process of the driving substrate 30.

[0141] In this configuration, the driving device 40 includes a bare chip and a silicon-based capacitor, and the bare chip may include a transistor. The silicon-based capacitor is electrically connected to the transistor in the bare chip and a portion of the signal traces 303 in the driving substrate 30. The connection relationship and function of the silicon-based capacitor in the pixel driving circuit 20 are the same as those of the capacitor in the above embodiment, and will not be repeated here.

[0142] Furthermore, the bare chip and the silicon-based capacitor are electrically connected to the internal signal wiring 303 of the driving substrate 30 through different driving device connecting parts 301, and the silicon-based capacitor is electrically connected to the bare chip through the driving device connecting part 301 and the internal signal wiring 303 of the driving substrate 30. Since each pixel driving circuit includes a capacitor, the number of pixel driving circuits 20 is the number of silicon-based capacitors.

[0143] Optional, you can continue to refer to Figure 4 In a possible embodiment, in a direction perpendicular to the plane where the driving substrate 30 is located, the height of the light emitting element 10 is the same as the height of the driving device 40 .

[0144] Here, the light emitting element 10 and the driver device 40 having the same height refer to the same height within the allowable range of process error. By setting the light emitting element 10 and the driver device 40 to have the same height, the light emitting element 10 and the driver device 40 can be transferred to the first surface 30A of the drive substrate 30 together in the same transfer process, thereby simplifying the transfer process.

[0145] Optional, Fig.14 A schematic diagram of the structure of another display panel provided in an embodiment of the present invention can be referred to Fig.14 The display panel may also include a first driving component 60 and a second driving component 70 located in the non-display area NA; the first driving component 60 is electrically connected to the first scanning signal line S1, the second scanning signal line S2 and the light-emitting control signal line EM, respectively, and the second driving component 70 is electrically connected to the data signal line Data, the first power supply voltage signal line (not shown in the figure) and the second power supply voltage signal line (not shown in the figure), respectively.

[0146] The first driving component 60 may include a gate driving chip, which is used to transmit corresponding gate control signals to transistors in the pixel driving circuit 20 through the first scanning signal line S1, the second scanning signal line S2 and the light emitting control signal line EM. The second driving component 70 may include a data driving chip 701, a data unit 702 and a power supply unit 703; the input end of the data driving chip 701 is electrically connected to the data unit 702, the output end of the data driving chip 701 is electrically connected to the data signal line Data, and the data unit 702 provides a data signal to the pixel driving circuit 20 through the data driving chip 701. The power supply unit 703 is directly electrically connected to the first power supply voltage signal line and the second power supply voltage signal line, respectively, to provide the first power supply voltage signal and the second power supply voltage signal to the pixel driving circuit 20. In addition, the power supply unit 703 may also provide other power supply signals to the display panel, which is not repeated or limited in the embodiment of the present invention.

[0147] Among them, optional, continue to refer to Fig.14The power supply unit 703 includes a first sub-power supply unit 7031 and a second sub-power supply unit 7032, and the first sub-power supply unit 7031 and the second sub-power supply unit 7032 are respectively located on both sides of the data unit 702 along the first direction X. Thus, the connection line between the first sub-power supply unit 7031 and the first power supply voltage signal line (and the second power supply voltage signal line) and the connection line between the second sub-power supply unit 7032 and the first power supply voltage signal line (and the second power supply voltage signal line) are close to both sides of the display area AA along the first direction X, thereby reducing the interference of the connection line to the signal line (such as the data signal line Data) in the middle display area AA, and not interfering with the layout of other signal lines.

[0148] Based on the same inventive concept, an embodiment of the invention further provides a method for preparing a display panel. Fig.15 A flowchart of a method for manufacturing a display panel provided by an embodiment of the present invention, referring to Fig.15 , the method for preparing the display panel comprises the following steps:

[0149] S110 , providing a driving substrate, wherein the driving substrate includes at least a partial structure of a pixel driving circuit.

[0150] The driving substrate may include a base substrate and a metal layer located on one side of the base substrate, and adjacent metal layers are separated by an insulating layer. In an embodiment of the present invention, at least a part of the circuit structure of the pixel driving circuit may be formed in the driving substrate.

[0151] S120, providing a light-emitting element and a driving device, wherein the driving device includes at least a partial structure of a pixel driving circuit.

[0152] The light-emitting element and the driving device can be independent elements, and at least part of the circuit structure of the pixel driving circuit can be set in the driving device, that is, at least part of the circuit structure of the pixel driving circuit is moved to the driving device on the first surface of the driving substrate, thereby reducing the number of components and wiring structures in the driving substrate. Eliminating the relevant processes of some film layers in the driving substrate is conducive to reducing the number of masks when preparing the driving substrate and simplifying the mask process, thereby greatly reducing the manufacturing cost and difficulty of the driving substrate.

[0153] S130, transferring at least part of the light emitting elements and / or at least part of the driving devices to the same side of the driving substrate, and electrically connecting the pixel driving circuit to the light emitting elements.

[0154] The light-emitting element and the driving device may be transferred to the driving substrate separately or simultaneously, and bonded to the driving substrate. The pixel driving circuit is electrically connected to the light-emitting element, and the light-emitting element emits light under the drive of the pixel driving circuit. For the same pixel driving circuit, there may be circuit structures located in the driving substrate and the driving device at the same time, and the circuit structure located in the driving substrate is electrically connected to the circuit structure located in the driving device to ensure the normal transmission of signals in the pixel driving circuit.

[0155] Through the scheme in the embodiment of the present invention, the number of components and wiring structures in the driving substrate can be reduced, so that the relevant processes of some film layers in the driving substrate can be eliminated, which is conducive to reducing the number of masks in the preparation of the driving substrate, simplifying the mask process, and greatly reducing the manufacturing cost and difficulty of the driving substrate. In addition, it can also provide a larger layout space for the pixel driving circuit structure in the driving substrate, reducing the difficulty of wiring in the driving substrate.

[0156] Fig.16 A flowchart of another method for manufacturing a display panel provided by an embodiment of the present invention, Fig.17 for Fig.16 Flow chart of the preparation method shown, Fig.16 The embodiment shown is further refined on the basis of the above embodiment. Specifically, (S130) in the above embodiment can be refined as follows: S230, transferring at least part of the light emitting elements and at least part of the driving devices to the same side of the driving substrate in the same transfer process. Fig.16 and Fig.17 , a method for preparing a display panel includes:

[0157] S210 , providing a driving substrate, wherein the driving substrate includes at least a partial structure of a pixel driving circuit.

[0158] like Fig.17 As shown in Figure (a), the driving substrate 30 may include circuit structures such as capacitor C and signal wiring 303 in the pixel driving circuit. One side of the driving substrate 30 includes a light-emitting element connection portion 306 and a driver device connection portion 301. The light-emitting element connection portion 306 is used for subsequent bonding with the light-emitting element 10, and the driver device connection portion 301 is used for subsequent bonding with the driver device 40.

[0159] S220, providing a light-emitting element and a driving device, wherein the driving device includes at least a partial structure of a pixel driving circuit.

[0160] like Fig.17As shown in Figure (b), the light-emitting element 10 includes but is not limited to a micro light-emitting diode. The driver device 40 includes but is not limited to a bare chip. The driver device 40 may include structures such as transistors in the pixel driving circuit 20. Among them, the light-emitting element 10 and the driver device 40 can be first transferred to the same transfer substrate 80. The side of the light-emitting element 10 away from the transfer substrate 80 includes electrodes (a first electrode 101 and a second electrode 102), and the side of the driver device connection portion 301 away from the transfer substrate 80 includes an auxiliary conductive portion 400.

[0161] The specific implementation of S210 and S220 is the same as that of the above embodiment and will not be repeated here.

[0162] S230, transferring at least part of the light emitting elements and at least part of the driving devices to the same side of the driving substrate in the same transfer process.

[0163] like Fig.17 As shown in Figure (c), the transfer substrate 80 can be aligned with the driving substrate 30, and after the electrode of the light-emitting element 10 is bonded to the light-emitting element connecting portion 306 and the auxiliary conductive portion 400 of the driving device 40 is bonded to the driving device connecting portion 301, the transfer substrate 80 is peeled off to complete the transfer of the light-emitting element 10 and the driving device 40.

[0164] Transferring the light emitting element 10 and the driving device 40 in the same transfer process can simplify the transfer process and reduce the display panel process.

[0165] In a possible embodiment, in a direction perpendicular to the plane where the driving substrate 30 is located, the height of the light emitting element 10 is the same as the height of the driving device 40. By setting the light emitting element 10 and the driving device 40 to be the same height, it is ensured that the light emitting element 10 and the driving device 40 are transferred to the driving substrate 30 together, thereby improving the bonding effect between the light emitting element 10 and the driving device 40 and the driving substrate 30.

[0166] After the above (S230), the process may further include: preparing a color resist layer and / or an encapsulation layer on the side of the light emitting element and the driving device away from the driving substrate. The specific preparation process of the color resist layer and the encapsulation layer may refer to any prior art, and the present invention will not elaborate on or limit this.

[0167] The method for preparing a display panel provided in an embodiment of the present invention includes all technical features and corresponding beneficial effects of the display panel provided in any embodiment of the present invention. Embodiments not fully described in the preparation method may refer to the corresponding embodiments of the display panel and will not be repeated here.

[0168] An embodiment of the present invention further provides a display device. Fig.18 FIG. 1 is a schematic diagram of a display device provided by an embodiment of the present invention. Fig.18As shown, the display device includes the display panel 100 provided by any embodiment of the present invention. Therefore, the display device provided by the embodiment of the present invention has the corresponding beneficial effects of the display panel provided by the embodiment of the present invention, which will not be repeated here. Exemplarily, the display device can be an electronic device such as a mobile phone, a computer, a smart wearable device (for example, a smart watch), and a car display device, which is not limited by the embodiment of the present invention.

[0169] Note that the above are only preferred embodiments of the present invention and the technical principles used. Those skilled in the art will understand that the present invention is not limited to the specific embodiments herein, and that various obvious changes, readjustments, combinations and substitutions can be made by those skilled in the art without departing from the scope of protection of the present invention. Therefore, although the present invention has been described in more detail through the above embodiments, the present invention is not limited to the above embodiments, and may include more other equivalent embodiments without departing from the concept of the present invention, and the scope of the present invention is determined by the scope of the appended claims.

Claims

1. A display panel, characterized in that: It includes a light emitting element and a pixel driving circuit, wherein the pixel driving circuit is electrically connected to the light emitting element; The display panel also includes a driving substrate and a driving device, at least part of the driving device and the light-emitting element are located on the same side of the driving substrate, the driving device includes at least part of the structure of the pixel driving circuit, and the driving substrate includes at least part of the structure of the pixel driving circuit.

2. The display panel according to claim 1, characterized in that: The pixel driving circuit includes an active part and a passive part, at least part of the active part is located in the driving device, and at least part of the passive part is located in the driving substrate.

3. The display panel according to claim 2, characterized in that: The active part includes a transistor or a semiconductor element, and the passive part includes a signal line or a capacitor.

4. The display panel according to claim 1, characterized in that: The driving substrate comprises a base substrate and a plurality of metal layers stacked on one side of the base substrate; The driving substrate further includes a plurality of signal lines, the signal lines include a plurality of first signal lines and a plurality of second signal lines; the first signal lines include power supply voltage signal lines; At least a portion of the first signal line is located in a metal layer on a side of the metal layer where the second signal line is located away from the substrate.

5. The display panel according to claim 4, characterized in that: The multiple metal layers include a first metal layer, a second metal layer, a third metal layer and a fourth metal layer stacked in sequence along a direction from the base substrate to the light emitting element; The first signal line includes a first power supply voltage signal line and a second power supply voltage signal line, and the second signal line includes a first scan signal line, a second scan signal line and a light emitting control signal line; the first scan signal line, the second scan signal line and the light emitting control signal line are located in the first metal layer, and the first power supply voltage signal line is located in the third metal layer; The second power supply voltage signal line is located in the fourth metal layer.

6. The display panel according to claim 4, characterized in that: The multiple metal layers include a first metal layer, a second metal layer and a third metal layer stacked in sequence along a direction from the base substrate to the light emitting element; The first signal line includes a first power supply voltage signal line and a second power supply voltage signal line, and the second signal line includes a first scan signal line, a second scan signal line and a light emitting control signal line; the first scan signal line, the second scan signal line and the light emitting control signal line are located in the first metal layer, and the first power supply voltage signal line is located in the second metal layer; The second power supply voltage signal line is located in the third metal layer.

7. The display panel according to claim 1, characterized in that: The pixel driving circuit includes a driving module, a light emitting control module, a data writing module, a storage module and a plurality of signal lines, wherein the driving module is electrically connected to the light emitting control module, the data writing module and the storage module respectively; the signal lines include a first power supply voltage signal line and a second power supply voltage signal line, wherein the first power supply voltage signal line is electrically connected to the light emitting control module, and the second power supply voltage signal line is electrically connected to the second electrode of the light emitting element; At least part of the structure of the driving module, at least part of the structure of the light-emitting control module, and at least part of the structure of the data writing module are located in the driving device, and at least part of the structure of the storage module, the first power supply voltage signal line, and the second power supply voltage signal line are located in the driving substrate.

8. The display panel according to claim 7, characterized in that: The light emitting control module includes a first transistor and a second transistor, the driving module includes a third transistor, the data writing module includes a fourth transistor, and the storage module includes a capacitor; the pixel driving circuit also includes a compensation module and a reset module, the compensation module includes a fifth transistor, and the reset module includes a sixth transistor and a seventh transistor; the first transistor, the second transistor, the third transistor, the fourth transistor, the fifth transistor, the sixth transistor, and the seventh transistor are all located in the driving device, and the capacitor is located in the driving substrate; The signal wiring also includes a data signal line, a reset signal line, a first scanning signal line, a second scanning signal line and a light emitting control signal line located in the driving substrate; The gates of the first transistor and the second transistor are electrically connected to the light-emitting control signal line, the first electrode of the first transistor is electrically connected to the first power supply voltage signal line, and the second electrode of the first transistor is electrically connected to the first electrode of the third transistor; the first electrode of the second transistor is electrically connected to the second electrode of the third transistor, and the second electrode of the second transistor is electrically connected to the first electrode of the light-emitting element; the gate of the fourth transistor is electrically connected to the first scanning signal line, the first electrode of the fourth transistor is electrically connected to the data signal line, and the second electrode of the fourth transistor is electrically connected to the first electrode of the third transistor; the gate of the fifth transistor is electrically connected to the first scanning signal line, and the fifth transistor is electrically connected to the first scanning signal line. The first electrode of the transistor is electrically connected to the gate of the third transistor, and the second electrode of the fifth transistor is electrically connected to the second electrode of the third transistor; the gate of the sixth transistor is electrically connected to the second scanning signal line, the first electrode of the sixth transistor is electrically connected to the reset signal line, and the second electrode of the sixth transistor is electrically connected to the gate of the third transistor; the gate of the seventh transistor is electrically connected to the first scanning signal line, the first electrode of the seventh transistor is electrically connected to the reset signal line, and the second electrode of the seventh transistor is electrically connected to the second electrode of the second transistor; the first plate of the capacitor is electrically connected to the first power supply voltage signal line, and the second plate of the capacitor is electrically connected to the gate of the third transistor.

9. The display panel according to claim 1, characterized in that: The driving substrate further includes a light emitting element connecting portion and a driving device connecting portion; the light emitting element connecting portion is used to electrically connect the light emitting element with the pixel driving circuit; the driving device connecting portion is used to electrically connect the driving device with the light emitting element, and / or electrically connect the driving device with a partial structure of the pixel driving circuit in the driving substrate; Wherein, the light emitting element connection portion and the driving device connection portion are in the same layer.

10. The display panel according to claim 1, characterized in that: The display panel comprises a display area and a non-display area surrounding at least a portion of the display area, and the light emitting element is located in the display area; The driving device includes a first driving device, and the first driving device is located in the display area.

11. The display panel according to claim 10, characterized in that: The display panel includes a plurality of first light emitting units, wherein the first light emitting units include a plurality of light emitting elements having different light emitting colors; In the same first light-emitting unit, one first driving device is electrically connected to a plurality of the light-emitting elements.

12. The display panel according to claim 10, characterized in that: The display panel includes a plurality of second light emitting units, and the second light emitting units include a plurality of light emitting elements with different light emitting colors; In the same second light-emitting unit, the first driving device is electrically connected to the light-emitting element in a one-to-one correspondence.

13. The display panel according to claim 10, characterized in that: The pixel driving circuit comprises an active part and a passive part, at least part of the active part is located in the first driving device, and at least part of the passive part is located in the driving substrate; In the orthographic projection diagram of the plane where the driving substrate is located, the first driving device is located between a partial structure of the passive part and the light-emitting element.

14. The display panel according to claim 13, characterized in that: The passive part includes a capacitor; In the orthographic projection diagram of the plane where the driving substrate is located, the first driving device is located between the capacitor and the light-emitting element.

15. The display panel according to claim 10, characterized in that: The display panel includes a plurality of light emitting units, and the light emitting units include a plurality of light emitting elements arranged along a first direction; The first driving device is located at one side of the corresponding light emitting unit along a second direction, wherein the first direction intersects with the second direction.

16. The display panel according to claim 10, characterized in that: The display panel includes a plurality of light emitting units, and the light emitting units include a plurality of light emitting elements arranged along a first direction; The display panel further includes a plurality of second signal line groups, wherein the second signal line groups include a plurality of second signal lines extending along a first direction and arranged along a second direction, wherein the first direction intersects with the second direction; The orthographic projection of the first driving device on the plane where the driving substrate is located overlaps with the orthographic projection of the second signal line group on the plane where the driving substrate is located.

17. The display panel according to claim 10, characterized in that: The driving substrate further includes a power supply voltage signal line, and the orthographic projection of the power supply voltage signal line on the plane where the driving substrate is located is outside the orthographic projection of the light emitting element and the first driving device on the plane where the driving substrate is located.

18. The display panel according to claim 1, characterized in that: The light emitting element comprises a micro light emitting diode.

19. The display panel according to claim 1, characterized in that: The driving substrate includes a passive driving substrate.

20. The display panel according to claim 1, characterized in that: The driving device includes a bare chip.

21. The display panel according to claim 1, characterized in that: The driving devices include a first type of driving devices and a second type of driving devices. The first type of driving devices include bare chips, and the second type of driving devices include silicon-based capacitors.

22. The display panel according to claim 1, characterized in that: In a direction perpendicular to the plane where the driving substrate is located, the height of the light emitting element is the same as the height of the driving device.

23. A method for preparing a display panel, characterized in that: Used to prepare the display panel according to any one of claims 1 to 22, the method for preparing the display panel comprising: Providing a driving substrate, the driving substrate comprising at least a partial structure of a pixel driving circuit; Providing a light-emitting element and a driving device, wherein the driving device includes at least a part of the structure of the pixel driving circuit; At least part of the light emitting elements and / or at least part of the driving devices are transferred to the same side of the driving substrate, and the pixel driving circuit is electrically connected to the light emitting elements.

24. The method for preparing a display panel according to claim 23, characterized in that: Transferring at least part of the light emitting elements and / or at least part of the driving devices to the same side of the driving substrate comprises: At least part of the light emitting element and at least part of the driving device are transferred to the same side of the driving substrate in the same transfer process.

25. A display device, characterized in that: A display panel comprising any one of claims 1-22.

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