Display panel, preparation method of display panel and display device

Abstract

The embodiment of the invention provides a display panel, a preparation method of the display panel and a display device. The display panel comprises a first driving substrate located on one side of a substrate. The first driving substrate comprises a first pixel circuit, and the first pixel circuit is used for providing first light-emitting driving current for the first light-emitting element. The display panel further comprises a second driving substrate which is located on the side, away from the first driving substrate, of the substrate. The second driving substrate comprises a second pixel circuit, and the second pixel circuit is used for providing a second light-emitting driving current for the second light-emitting element. According to the embodiment of the invention, the first pixel circuit and the second pixel circuit are prepared separately, the wiring coupling influence between the two pixel circuits is reduced, conditions are provided for different light-emitting elements to receive more accurate light-emitting driving current, the light-emitting accuracy of the light-emitting elements is improved, and the display uniformity of the display panel is improved.

Description

Technical Field

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

[0002] In a display panel, there are usually red, green, and blue light-emitting elements. However, under white balance conditions, there are differences in the driving currents among the three light-emitting elements. The red light-emitting element requires a relatively large light-emitting driving current, while the green and blue light-emitting elements require relatively small light-emitting driving currents. Looking at the entire surface of the display panel, the coupling degrees of power voltage traces and other traces in the global trace at different positions of the light-emitting elements are different, resulting in differences in the potentials of the power voltages between pixels, leading to obvious differences in the display brightness of different pixels and causing poor uniformity of the display panel. Summary of the Invention

[0003] In view of this, this application provides a display panel, a method for manufacturing the display panel, and a display device to facilitate solving the above problems.

[0004] In a first aspect, an embodiment of this application provides a display panel, which includes: A substrate; A first driving substrate located on one side of the substrate; the first driving substrate includes a first pixel circuit for providing a first light-emitting driving current to a first light-emitting element; A second driving substrate located on the side of the substrate away from the first driving substrate; the second driving substrate includes a second pixel circuit for providing a second light-emitting driving current to a second light-emitting element; When the display screen of the display panel is in a white balance state, the first light-emitting driving current is greater than the second light-emitting driving current.

[0005] In a second aspect, an embodiment of this application provides a display device, including the display panel proposed in the first aspect above.

[0006] In a third aspect, an embodiment of this application provides a method for manufacturing a display panel for manufacturing the display panel proposed in the first aspect; the manufacturing method includes: Providing a first substrate and a second substrate; Preparing a first pixel circuit on one side of the first substrate to obtain a first driving substrate; and preparing a second pixel circuit on one side of the second substrate to obtain a second driving substrate; Preparing a first light-emitting element on the side of the first pixel circuit away from the first substrate, and preparing a second light-emitting element on the side of the second pixel circuit away from the second substrate; Preparing a first encapsulation layer on the surface of the first light-emitting element, and preparing a second encapsulation layer on the surface of the second light-emitting element; Bond the side of the first substrate away from the first pixel circuit to the side of the second substrate away from the second pixel circuit to obtain a display panel.

[0007] In a fourth aspect, an embodiment of the present application provides another method for manufacturing a display panel for manufacturing the display panel proposed in the first aspect; the manufacturing method includes: Provide a first substrate; Manufacture a first pixel circuit on one side of the first substrate to obtain a first driving substrate; Manufacture a first light-emitting element on the side of the first pixel circuit away from the first substrate; Manufacture a first encapsulation layer on the surface of the first light-emitting element; Manufacture a second pixel circuit on the side of the first substrate away from the first light-emitting element to obtain a second driving substrate; Manufacture a second light-emitting element on the side of the second pixel circuit away from the first substrate; Manufacture a second encapsulation layer on the surface of the second light-emitting element away from the first substrate to obtain a display panel.

[0008] In the embodiment of the present application, it is provided that the display panel includes a first driving substrate and a second driving substrate. The first pixel circuit and the first light-emitting element are both manufactured on the first driving substrate, and the second pixel circuit and the second light-emitting element are both manufactured on the second driving substrate, which is beneficial to separately manufacturing the first pixel circuit and the second pixel circuit, increasing the safety distance between the first pixel circuit and the second pixel circuit, and reducing the influence of routing coupling between the two pixel circuits. Moreover, it is beneficial to provide conditions for separately manufacturing different driving substrates for power supply traces that are more affected by coupling, and providing conditions for different light-emitting elements to receive more accurate light-emitting driving currents, which is beneficial to improving the light-emitting accuracy of the light-emitting elements and the display uniformity of the display panel. BRIEF DESCRIPTION OF THE DRAWINGS

[0009] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings required for the embodiments will be briefly introduced below. Obviously, the drawings in the following description are only some embodiments of the present application. For those of ordinary skill in the art, other drawings can be obtained based on these drawings without creative efforts.

[0010] Figure 1 A schematic plan view of a display panel provided by an embodiment of the present application; Figure 2 A schematic cross-sectional view along the A-A' direction in an embodiment of the present application; Figure 1 in an embodiment of the present application; Figure 3 A schematic diagram of a first pixel circuit provided by an embodiment of the present application; Figure 4 Schematic diagram of a second pixel circuit provided by an embodiment of the present application; Figure 5 Planar schematic diagram of another display panel provided by an embodiment of the present application; Figure 6 Planar schematic diagram of another display panel provided by an embodiment of the present application; Figure 7 Another one provided by an embodiment of the present application Figure 1 Cross-sectional schematic diagram along the A-A' direction in; Figure 8 Planar schematic diagram of another display panel provided by an embodiment of the present application; Figure 9 Schematic diagram of a third pixel circuit provided by an embodiment of the present application; Figure 10 One provided by an embodiment of the present application Figure 8 Cross-sectional schematic diagram along the B-B' direction in; Figure 11 Planar schematic diagram of another display panel provided by an embodiment of the present application; Figure 12 One provided by an embodiment of the present application Figure 11 Cross-sectional view along the C-C' direction in; Figure 13 Planar schematic diagram of a display device provided by an embodiment of the present application; Figure 14 Flowchart of a method for manufacturing a display panel provided by an embodiment of the present application; Figure 15 Flowchart of another method for manufacturing a display panel provided by an embodiment of the present application; Figure 16 Flowchart of another method for manufacturing a display panel provided by an embodiment of the present application; Figure 17 Flowchart of another method for manufacturing a display panel provided by an embodiment of the present application. Detailed implementation manners

[0011] For a better understanding of the technical solutions of the present application, the embodiments of the present application will be described in detail below with reference to the accompanying drawings.

[0012] It should be clear that the described embodiments are only a part of the embodiments of the present application, rather than all the embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments in the present application without creative efforts shall fall within the protection scope of the present application.

[0013] The terms used in the embodiments of the present application are for the purpose of describing specific embodiments only and are not intended to limit the present application. The singular forms "a", "an", and "the" used in the embodiments of the present application and the appended claims are also intended to include the plural forms unless the context clearly indicates otherwise.

[0014] It should be understood that the term "and / or" used herein is merely a description of the association relationship of associated objects, indicating that there can be three relationships. For example, A and / or B can represent: A exists alone, A and B exist simultaneously, and B exists alone. In addition, the character " / " herein generally represents an "or" relationship between the associated objects before and after.

[0015] In the description of this specification, it should be understood that the words "substantially", "approximately", "about", "around", "roughly", "generally" and the like described in the claims and embodiments of the present application refer to what can be generally recognized within a reasonable process operation range or tolerance range, rather than an exact value.

[0016] It should be understood that although the terms first, second, etc. may be used in the embodiments of the present application to describe the driving substrate, the light-emitting element, the substrate, etc., these should not be limited to these terms. These terms are only used to distinguish the driving substrate, the light-emitting element, the substrate, etc. from each other. For example, without departing from the scope of the embodiments of the present application, the first driving substrate may also be referred to as the second driving substrate, and similarly, the second driving substrate may also be referred to as the first driving substrate. Through careful and in-depth research, the applicant of this case provides a solution to the problems existing in the prior art.

[0017] Figure 1 It is a schematic plan view of a display panel provided for the embodiments of the present application. Figure 2 It is a kind provided for the embodiments of the present application. Figure 1 It is a schematic cross-sectional view along the A-A' direction in it. The embodiments of the present application provide a display panel A10. The display panel includes a substrate 10, and multiple film layers in the display panel A10 are prepared on the substrate 10.

[0018] In an embodiment of the present application, the display panel A10 is taken as an example of a Micro-LED display panel for illustration. In a display panel, there are usually various light-emitting elements with different light-emitting colors, such as red light-emitting elements, green light-emitting elements, and blue light-emitting elements. However, in terms of the light-emitting driving current required by the light-emitting elements, the maximum light-emitting driving current that different light-emitting elements can receive when emitting light is different. Through research, it is found that there are light-emitting elements that require a relatively large light-emitting driving current, such as red light-emitting elements, and there are also light-emitting elements that require a relatively small light-emitting driving current, such as green light-emitting elements and blue light-emitting elements. When the pixel circuit generates a light-emitting driving current and provides it to the light-emitting element, the pixel circuits driving light-emitting elements of different colors are electrically connected to the same power supply voltage line. However, due to the coupling between the power supply voltage trace and the trace for transmitting the light-emitting driving current. This results in a relatively large coupling degree at the light-emitting element that needs to receive a large light-emitting driving current, causing the potential of the power supply voltage trace to fluctuate, thereby resulting in poor uniformity of the power supply voltage signals received at other positions, reducing the accuracy of the light-emitting driving current at different pixels, and making the display uniformity in the display panel poor. To reduce the influence brought by the above-mentioned coupling differences of different light-emitting elements, the following technical solutions are proposed.

[0019] It is provided that the display panel A10 further includes a first driving substrate 20, and the first driving substrate 20 is located on one side of the substrate 10. The first driving substrate 20 includes a first pixel circuit 201, and the first pixel circuit 201 is used to provide a first light-emitting driving current to the first light-emitting element 202. It is provided that the display panel A10 further includes a second driving substrate 30, and the second driving substrate 30 is located on the side of the substrate 10 away from the first driving substrate 20. The second driving substrate 30 includes a second pixel circuit 301, and the second pixel circuit 301 is used to provide a second light-emitting driving current to the second light-emitting element 302. It should be noted that, as Figure 1 shown, the first pixel circuit 201 includes multiple transistors, and one transistor in the figure is only a schematic of the first pixel circuit 201; similarly, the second pixel circuit 301 also includes multiple transistors, and one transistor in the figure is only a schematic of the second pixel circuit 301.

[0020] Optionally, the light-emitting driving currents required by the first light-emitting element 202 and the second light-emitting element 302 are different. The coupling degree between different traces electrically connected to the first pixel circuit 201 is also different from the coupling degree between different traces electrically connected to the second pixel circuit 301.

[0021] When the display screen of the display panel A10 is in the white balance state, the first light-emitting driving current is greater than the second light-emitting driving current. In the embodiment of the present application, taking the case where the light-emitting driving current required by the first light-emitting element is relatively large as an example for illustration. It should be noted that not only when the display screen of the display panel A10 is in the white balance state, but also in terms of the maximum light-emitting driving currents required by the first light-emitting element and the second light-emitting element, the maximum light-emitting driving current required by the first light-emitting element is also greater than the maximum light-emitting driving current required by the second light-emitting element. That is to say, the first light-emitting element can be a light-emitting element that requires high-current driving, and the second light-emitting element can be a light-emitting element that requires low-current driving.

[0022] In the embodiment of the present application, it is set that the display panel A10 includes a first driving substrate 20 and a second driving substrate 30. The first pixel circuit 201 and the first light-emitting element 202 are both fabricated on the first driving substrate 20, and the second pixel circuit 301 and the second light-emitting element 302 are both fabricated on the second driving substrate 30. This is beneficial to separately fabricate the first pixel circuit 201 and the second pixel circuit 301, increase the safety distance between the first pixel circuit 201 and the second pixel circuit 301, and reduce the influence of trace coupling between the two pixel circuits. Moreover, it is beneficial to provide conditions for separately fabricating power traces that are more affected by coupling on different driving substrates, and provide conditions for different light-emitting elements to receive more accurate light-emitting driving currents, which is beneficial to improving the light-emitting accuracy of the light-emitting elements and the display uniformity of the display panel.

[0023] In an embodiment of the present application, the first light-emitting element 202 is a red light-emitting element. Due to the display characteristics of the red light-emitting element, the luminous efficiency of the red light-emitting element is relatively low. Therefore, to meet the light-emitting requirements of the red light-emitting element, the light-emitting driving current of the red light-emitting element is usually increased. Therefore, fabricating the red light-emitting element and light-emitting elements of other colors on different driving substrates is beneficial to fabricating the pixel circuit for driving the red light-emitting element, which can be the first pixel circuit 201 and the pixel circuits for driving light-emitting elements of other colors on different substrates, reducing the influence brought by the coupling difference between different traces, improving the light-emitting brightness accuracy of the light-emitting elements, and improving the display uniformity of the display panel.

[0024] Figure 3 Schematic diagram of a first pixel circuit provided by an embodiment of the present application Figure 4 Schematic diagram of a second pixel circuit provided by an embodiment of the present application.

[0025] In an embodiment of the present application, as Figure 3 、 Figure 4As shown in the figure, the display panel A10 includes a first power supply voltage line PVDD. The first power supply voltage line PVDD includes a first sub-power supply voltage line PVDD1 and a second sub-power supply voltage line PVDD2 that transmit signals of the same type. The first pixel circuit 201 is electrically connected to the first sub-power supply voltage line PVDD1, and the second pixel circuit 301 is electrically connected to the second sub-power supply voltage line PVDD2. Optionally, the first power supply voltage line PVDD is used to transmit a power supply voltage signal. The first power supply voltage line PVDD is used as a signal line for transmitting a positive voltage signal to the pixel circuit.

[0026] In the first pixel circuit 201, a first sub-power supply voltage writing module 201A is included. During the light-emitting stage of the first pixel circuit 201, the first sub-power supply voltage writing module 201A transmits the power supply voltage transmitted by the first sub-power supply voltage line PVDD1 to the driving transistor Md, so that the driving transistor Md generates a first light-emitting driving current I1. The first light-emitting driving current I1 is transmitted to the first light-emitting element 202, so that the first light-emitting element 202 emits light.

[0027] In the second pixel circuit 301, a second sub-power supply voltage writing module 301A is included. During the light-emitting stage of the second pixel circuit 301, the first power supply voltage writing module B1 transmits the power supply voltage transmitted by the second sub-power supply voltage line PVDD2 to the driving transistor Md, so that the driving transistor Md generates a second light-emitting driving current I2. The second light-emitting driving current I2 is transmitted to the second light-emitting element 302, so that the first light-emitting element 202 emits light.

[0028] In the embodiment of the present application, the first power supply voltage line PVDD, which is greatly affected by coupling differences, is prepared separately. The first sub-power supply voltage line PVDD1 is prepared on the first driving substrate 20 and is electrically connected to the first pixel circuit 201; and the second sub-power supply voltage line PVDD2 is prepared on the second driving substrate 30 and is electrically connected to the second pixel circuit 301. This helps to avoid the situation where, when the first pixel circuit 201 and the second pixel circuit 301 are electrically connected to the same first power supply voltage line PVDD, there are differences in the power supply voltages at different positions due to coupling differences, resulting in an impact on the magnitudes of the light-emitting driving currents generated by the light-emitting elements at different positions. It is beneficial to reduce the influence of the first pixel circuit 201 on the second sub-power supply voltage line PVDD2 and reduce the influence of the second pixel circuit 301 on the first sub-power supply voltage line PVDD1, making the second light-emitting driving current I2 generated by the second pixel circuit 301 more accurate, reducing the fluctuation of the second light-emitting driving current I2, improving the light-emitting accuracy of the second light-emitting element 202, and thus improving the display uniformity of the display panel A10.

[0029] In an embodiment of the present application, the potentials of the first sub-power supply voltage line PVDD1 and the second sub-power supply voltage line PVDD2 are the same, which is beneficial to unify the power supply voltages on the first driving substrate 20 and the second driving substrate 30, and is closer to the structure in which the first pixel circuit 201 and the second pixel circuit 301 are both fabricated on the same driving substrate and electrically connected to the same power supply voltage line, ensuring the working stability of the display panel A10. At the same time, it is also beneficial to ensure the accuracy of the light-emitting driving currents received by the first light-emitting element 202 and the second light-emitting element 302. Moreover, the magnitude of the light-emitting driving current is related to the power supply voltage and the data voltage. Unifying the power supply voltage is beneficial to uniformly determining the value of the data voltage, thereby reducing the operation difficulty of the display panel A10.

[0030] In an embodiment of the present application, the potentials of the first sub-power supply voltage line PVDD1 and the second sub-power supply voltage line PVDD2 are different. That is to say, the first sub-power supply voltage line PVDD1 and the second sub-power supply voltage line PVDD2 can respectively transmit different power supply voltage values to the first pixel circuit 201 and the second pixel circuit 301. The power supply voltage values received by the first pixel circuit 201 and the second pixel circuit 301 can be adjusted according to the light-emitting efficiencies of the first light-emitting element 202 and the second light-emitting element 302, which is beneficial to improving the flexibility of driving the first light-emitting element 202 and the second light-emitting element 302 and better adjusting the magnitudes of the first light-emitting driving current I1 and the second light-emitting driving current I2.

[0031] In an embodiment of the present application, continue to refer to Figure 3 、 Figure 4 As shown, the pixel circuit A20 includes a first transistor M1 and a second transistor M2. The first transistor M1 is electrically connected between the first power supply voltage line PVDD and the driving transistor Md, and the second transistor M2 is electrically connected between the driving transistor Md and the light-emitting element A30. The driving transistor Md is used to generate a light-emitting driving current to the light-emitting element A30.

[0032] It should be noted that the pixel circuit A20 proposed here may include the first pixel circuit 201 and the second pixel circuit 301, and the circuit modules in the pixel circuit A20 are the same as those in the first pixel circuit 201 and the second pixel circuit 301. However, the specifications and types of the first transistor M1 and the second transistor M2 in the first pixel circuit 201 and the first transistor M1 and the second transistor M2 in the second pixel circuit 301 may be different.

[0033] In the embodiment of the present application, the sizes of the first transistor M1 and the second transistor M2 in the first pixel circuit 201 are larger than those of the first transistor M1 and the second transistor M2 in the second pixel circuit 301. The size of the transistor mentioned here can be the overlapping area between the gate of the transistor and the active layer. From the above content, when the display screen of the display panel A10 is in the white balance state, the first light-emitting drive current I1 is greater than the second light-emitting drive current I2. Then, the driving transistor Md in the first pixel circuit 201 needs to have the ability to generate a large current, and the second transistor M2 needs to have the ability to transmit a large current. Therefore, setting the sizes of the first transistor M1 and the second transistor M2 in the first pixel circuit 201 to be relatively large is beneficial to ensuring the ability of the first pixel circuit 201 to generate a large current, and is also beneficial to improving the working efficiency when the first pixel circuit 201 generates the first drive current I1, and avoiding the low working efficiency when using small-sized transistors to generate a large current.

[0034] It should be added that in the embodiment of the present application, the pixel circuit A20 is taken as an example of a 7T1C circuit for illustration. Combining Figure 3 、 Figure 4 As shown, the pixel circuit A20 further includes a third transistor M3 - a sixth transistor M6. Among them, the third transistor M3 can be used to provide a data voltage Vdata for the driving transistor Md, and the magnitude of the data voltage Vdata can be used to adjust the magnitude of the light-emitting drive current generated by the driving transistor Md. The fourth transistor M4 can be used to be electrically connected to the gate of the driving transistor Md and transmit a reset voltage Vref to the gate of the driving transistor Md, so as to ensure the accuracy of the gate of the driving transistor Md when receiving the data voltage Vdata next time. The first pole of the driving transistor Md is electrically connected to the first transistor M1, the second pole is electrically connected to the fifth transistor M5, and the gate is also electrically connected to the fifth transistor M5. The fifth transistor M5 can compensate the threshold voltage of the driving transistor Md to the gate of the driving transistor Md. The sixth transistor M6 can be used to be electrically connected to the first pole of the light-emitting element A30 and provide a reset voltage Vref for the light-emitting element A30, so as to ensure the accuracy of the light-emitting drive current received by the light-emitting element A30. Among them, the light-emitting control signal Emit can be used to control the first transistor M1 and the second transistor M2. The first control signal S1 can be used to simultaneously control the third transistor M3, the fifth transistor M5, and the sixth transistor M6, and the second control signal S2 can be used to simultaneously control the fourth transistor M4.

[0035] Figure 5 It is a schematic plan view of another display panel provided by the embodiment of the present application.

[0036] In an embodiment of the present application, as Figure 5As shown, the display panel A10 further includes a plurality of cascaded shift register circuits 40, and the output terminals of at least some of the shift register circuits 40 are electrically connected to the pixel circuits A30. The shift register circuit 40 can be used to generate control signals and transmit the generated control signals to the pixel circuits A30 to drive the pixel circuits A30 into different working stages.

[0037] It should be noted that in the planar schematic diagram of the display panel provided in the embodiments of the present application, for example Figure 5 as shown in the figure, the illustrated part shaded by the substrate 10, that is, the part represented by the illustration covered by the layer where the substrate 10 is located, is the component prepared below the substrate 10 in the direction perpendicular to the plane where the display panel A10 is located and in the top view direction of the light-emitting surface of the display panel A10, such as the second light-emitting element 302 and the second pixel circuit 301. Then, the part represented by the illustration not covered by the layer where the substrate 10 is located in the schematic diagram is the component prepared above the substrate 10, such as the first light-emitting element 202 and the first pixel circuit 201.

[0038] It is set that the shift register circuit 40 in the display panel A10 includes a first sub-shift register circuit 401 and a second sub-shift register circuit 402. The first sub-shift register circuit 401 is electrically connected to the first pixel circuit 201, and the second sub-shift register circuit 402 is electrically connected to the second pixel circuit 301.

[0039] In the related art, the pixel circuits in the same row can include multiple pixel circuits for driving light-emitting elements of different colors, and the pixel circuits in the same row are electrically connected to the output terminals of the same shift register circuit 40. However, in the embodiments of the present application, it is set that the first pixel circuit 201 and the second pixel circuit 301 are respectively driven by different shift registers 40, which is beneficial to more flexibly control the working processes of the first pixel circuit 201 and the second pixel circuit 301.

[0040] In the embodiments of the present application, it is set that the first sub-shift register circuit 401 is located on the first driving substrate 20, and the second sub-shift register circuit 402 is located on the second driving substrate 30, which is beneficial to avoiding signal interference between the first sub-shift register circuit 401 and the second sub-shift register circuit 402, thereby ensuring the accuracy of the driving signals transmitted by the first sub-shift register circuit 401 and the second sub-shift register circuit 402 and improving the working stability of the display panel A10. Moreover, placing the first sub-shift register circuit 401 and the second sub-shift register circuit 402 on two driving substrates respectively is beneficial to avoiding the situation of placing more shift registers 40 on the same driving substrate, beneficial to reducing the circuit congestion degree on the same driving substrate, and improving the working yield of the display panel A10.

[0041] Figure 6A schematic plan view of another display panel provided by an embodiment of the present application.

[0042] In an embodiment of the present application, as Figure 6 shown, the display panel A10 further includes a plurality of cascaded shift register circuits 40, and the output ends of at least some of the shift register circuits 40 are electrically connected to the pixel circuits A20. The shift register circuit 40 can be used to generate driving signals and transmit the generated driving signals to the pixel circuits A20 to drive the pixel circuits A20 into different working stages. The shift register circuit 40 includes a first sub-shift register circuit 401 and a second sub-shift register circuit 402. The first sub-shift register circuit 401 is electrically connected to the first pixel circuit 201, and the second sub-shift register circuit 402 is electrically connected to the second pixel circuit 301.

[0043] In the embodiment of the present application, it is set that both the first sub-shift register circuit 401 and the second sub-shift register circuit 402 are located on the second driving substrate 30. The second light-emitting element 302 and the second pixel circuit 301 are fabricated on the second driving substrate 30. Since the sizes of the first transistor M1 and the second transistor M2 in the second pixel circuit 301 are small, the pixel circuits on the second driving substrate 30 can occupy less space. Therefore, setting both the first sub-shift register circuit 401 and the second shift register circuit 402 on the second driving substrate 30 is beneficial to better utilize the space area on the second driving substrate 30 and improve the space utilization rate of the second driving substrate 30. At the same time, it is also beneficial to reduce the circuit congestion on the first driving substrate 20, contribute to fabricating more functional circuits on the display panel A10, and improve the functional diversity of the display panel A10.

[0044] In an embodiment of the present application, the substrate 10 is a flexible substrate, which is convenient for the opening process. It can be set that the output end of the first sub-shift register circuit 401 is electrically connected to the first pixel circuit 301 through a punched hole.

[0045] In an embodiment of the present application, continue to refer to Figure 1 、 Figure 2 shown, the first light-emitting element 202 is located on the side of the first driving substrate 20 facing the light-emitting surface of the display panel A10, and the second light-emitting element 302 is located on the side of the second driving substrate 30 facing the backlight surface of the display panel A10. As Figure 2 shown, the first light-emitting element 202 and the second light-emitting element 302 are respectively located on two driving substrates, and in the direction perpendicular to the plane where the display panel A10 is located, the first driving substrate 20, the second driving substrate 30, and the substrate 10 are included between the first light-emitting element 202 and the second light-emitting element 302.

[0046] In the embodiments of the present application, the light-emitting elements A20 all include a light-emitting surface. The light-emitting surface of the first light-emitting element 202 is the surface of the first light-emitting element 202 away from the first driving substrate 20, and the light-emitting surface of the second light-emitting element 302 is the surface of the second light-emitting element 302 facing the second driving substrate 30. That is to say, the first driving substrate 20 is located on the side of the second driving substrate 30 facing the light-emitting surface of the display panel A10, and the first driving substrate 20 is closer to the light-emitting surface of the display panel A10. Optionally, the first light-emitting element 202 is a top-emitting element. One side of the first light-emitting element 202 close to the first driving substrate 20 includes an electrode electrically connected to the first pixel circuit 201, and the side of the first light-emitting element 202 away from the first driving substrate 20 is the top surface of the first light-emitting element 202, and this surface is the light-emitting surface of the first light-emitting element 202. The second driving substrate 30 is located on the side of the first driving substrate 20 facing the backlight surface of the display panel A10, and the second driving substrate 30 is closer to the backlight surface of the display panel A10. Optionally, the second light-emitting element 302 is a bottom-emitting element. One side of the second light-emitting element 302 close to the second driving substrate 30 includes an electrode electrically connected to the second pixel circuit 301, and the side of the second light-emitting element 302 close to the second driving substrate 30 is the bottom surface of the second light-emitting element 302, and this surface is the light-emitting surface of the second light-emitting element 302. In this way, by adjusting the device structures of the first light-emitting element 202 and the second light-emitting element 302, the light-emitting directions of the first light-emitting element 202 and the second light-emitting element 302 are the same. When the first light-emitting element 202 and the second light-emitting element 302 are opposite in the vertical position, the normal light emission requirement of the pixel can still be met.

[0047] In one embodiment of the present application, continue to refer to Figure 2 As shown, along the direction perpendicular to the plane where the display panel A10 is located, the first light-emitting element 202 and the second light-emitting element 302 do not overlap. Optionally, the display panel A10 includes a plurality of pixels, and at least one first light-emitting element 202 and one second light-emitting element 302 are included in one pixel. The first light-emitting element 202 and the second light-emitting element 302 in the same pixel cooperate to emit light to realize the display of the picture of the display panel A10. For example, when the display panel A10 is in the white balance state, both the first light-emitting element 202 and the second light-emitting element 302 need to emit light. Setting the first light-emitting element 202 and the second light-emitting element 302 not to overlap in the direction perpendicular to the plane where the display panel A10 is located is beneficial to avoiding the light emission of the second light-emitting element 302 being blocked by the first light-emitting element 202, and is beneficial to avoiding the influence on the accuracy of the light-emitting color when the light generated by the second light-emitting element 302 and the light generated by the first light-emitting element 202 have a high overlap degree, so as to ensure that the second light-emitting element 302 can emit light normally, and ensure the light-emitting quality of the first light-emitting element 202 and the second light-emitting element 302, and ensure the display effect of the display panel A10.

[0048] In one embodiment of the present application, with continued reference to Figure 1 and Figure 2 as shown, along the direction perpendicular to the plane where the display panel A10 is located, the first pixel circuit 201 and the second pixel circuit 301 at least partially overlap and do not overlap with the second light-emitting element 302.

[0049] In the embodiment of the present application, the first pixel circuit 201 and the second pixel circuit 301 are respectively located on the first driving substrate 20 and the second driving substrate 30. Setting the first pixel circuit 201 and the second pixel circuit 301 to at least partially overlap is conducive to making full use of the overlapping structure of the two driving substrates provided in the embodiment of the present application, so that the plane spaces occupied by the first pixel circuit 201 and the second pixel circuit 301 overlap in the vertical direction. When viewed in the direction parallel to the plane where the display panel A10 is located, the plane areas occupied by the first pixel circuit 201 and the second pixel circuit 301 are reduced, which is conducive to providing feasible conditions for increasing the number of light-emitting elements A20 and pixel circuits A30 in the display panel A10 and improving the resolution of the display panel A10, and improving the display effect of the display panel A10. Moreover, it is also conducive to increasing the available space of the display panel A10 for preparing various functional circuits.

[0050] In addition, along the direction perpendicular to the plane where the display panel A10 is located, both the first pixel circuit 201 and the second pixel circuit 301 are located on the side of the second light-emitting element 302 facing the light-emitting surface of the display panel A10. That is to say, both the first pixel circuit 201 and the second pixel circuit 301 have the risk of blocking the light emitted by the second light-emitting element 302. In the embodiment of the present application, it is set that both the first pixel circuit 201 and the second pixel circuit 301 do not overlap with the second light-emitting element 302, which is conducive to avoiding the pixel circuit from blocking the second light-emitting element 302, and is conducive to ensuring that the light-emitting area of the second light-emitting element 302 is not reduced and ensuring the light-emitting effect of the second light-emitting element 302.

[0051] In another implementation manner of the embodiment of the present application, it is set that the traces in the first pixel circuit 201 and the second pixel circuit 301 include at least partially transparent traces, so that in the direction perpendicular to the plane where the display panel A10 is located, the transparent trace parts of the first pixel circuit 201 and the second pixel circuit 301 can overlap with the second light-emitting element 302.

[0052] In one embodiment of the present application, with reference to Figure 1 and Figure 2 as shown, along the direction perpendicular to the plane where the display panel A10 is located, the first pixel circuit 201 and the first light-emitting element 202 at least partially overlap.

[0053] In the embodiment of the present application, the light-emitting surface of the first light-emitting element 202 is the surface of the first light-emitting element 202 away from the first driving substrate 20, and the first pixel circuit 201 is located on the side of the first light-emitting element 202 away from the light-emitting surface of the display panel A10. Then, the first pixel circuit 201 does not block the light emitted by the first light-emitting element 202. Setting at least partial overlap between the first pixel circuit 201 and the first light-emitting element 202 is beneficial to reducing the planar space occupied by the first pixel circuit 201 and the first light-emitting element 202, and reducing the risk of the first pixel circuit 201 and the first light-emitting element 202 blocking the second light-emitting element 302, and increasing the area where the second light-emitting element 302 can smoothly emit light on the side facing the light-emitting surface of the display panel A10.

[0054] Figure 7 Another provided by the embodiment of the present application Figure 1 The cross-sectional schematic diagram along the A-A' direction in

[0055] In an embodiment of the present application, in combination with Figure 1 、 Figure 7 As shown, the light-emitting element A30 includes a first electrode A301, and the first electrode A301 of the light-emitting element A30 is electrically connected to the pixel circuit A20. The light-emitting element A30 further includes a second electrode A302. Optionally, the first electrode A301 of the light-emitting element A30 is an anode and the second electrode A302 is a cathode.

[0056] The first electrode A201 of the second light-emitting element 302 is located on the side of the second light-emitting element 302 facing the second driving substrate 30. Optionally, the second electrode A202 of the second light-emitting element 302 proposed in the embodiment of the present application is also located on the side of the second light-emitting element 302 facing the second driving substrate 30. The second light-emitting element 302 includes a light-emitting region Q1 and an electrode region Q2 arranged along the first direction X1, and the first direction X1 is parallel to the plane where the second light-emitting element 302 is located.

[0057] The electrode region Q2 can be used to prepare the first electrode A201 of the second light-emitting element 302, and the light-emitting region Q1 is used to emit at least part of the light emitted by the second light-emitting element 302. It should be added that the electrode region Q2 can also be used to prepare the second electrode A202 of the second light-emitting element 302. Here, the electrode region Q2 can be distributed on the opposite sides of the light-emitting region Q1 in the first direction X1. In the first direction X1, one of the electrode regions Q2 on the left and right sides of the light-emitting region Q1 is used to prepare the first electrode A201, and the other electrode region Q2 is used to prepare the second electrode A202.

[0058] The first driving substrate 20 and the second driving substrate 30 both include a plurality of film layers. Generally, the transparency of the plurality of film layers on the driving substrate 30 is relatively low, which is not conducive to the transmission of light. However, in the embodiments of the present application, since the first driving substrate 20 and the second driving substrate 30 are both located on the side of the second light-emitting element 302 facing the light-emitting surface of the display panel A10, the plurality of film layers on the first driving substrate 20 and the second driving substrate 30 also pose an obstacle to the light emission of the second light-emitting element 302. Therefore, in the embodiments of the present application, it is provided that the first driving substrate 20 and the second driving substrate 30 both include a transparent region Q3 overlapping in a direction perpendicular to the plane of the display panel A10. The film layer in the transparent region Q3 has a relatively high light transmittance, preparing for the light of the second light-emitting element 302 to pass through the plurality of film layers of the first driving substrate 20 and the second driving substrate 30 to complete light emission.

[0059] In addition, optionally, the used substrate 10 may be a transparent glass or the like including a film layer of a transparent material. Or, optionally, the used substrate 10 also includes a transparent region Q3 overlapping with the transparent region Q3 on the first driving substrate 20 and the second driving substrate 30.

[0060] In the embodiments of the present application, it is provided that the first driving substrate 20 and the third driving substrate 30 both include a transparent region Q3, and in a direction perpendicular to the plane of the display panel A10, the light-emitting region Q1 and the transparent region Q3 at least partially overlap, which is conducive to enabling the light in the light-emitting region Q1 to be emitted toward the light-emitting surface of the display panel A10 through the transparent region Q3.

[0061] In an embodiment of the present application, the film layer material in the transparent region Q3 includes a transparent material. During the process of manufacturing the first driving substrate 20 and the second driving substrate 30, at least at the position overlapping with the light-emitting region Q1 of the second light-emitting element 302, the material for preparing each film layer is replaced with a transparent material to complete the preparation of the transparent region Q3, so that the light in the light-emitting region Q1 can emit light through the transparent region Q3.

[0062] Figure 8 It is a schematic plan view of another display panel provided by the embodiments of the present application. Figure 9 It is a schematic diagram of a third pixel circuit provided by the embodiments of the present application.

[0063] In an embodiment of the present application, as Figure 8 shown, the second driving substrate 30 further includes a third pixel circuit 303, and the third pixel circuit 303 is configured to provide a third light-emitting driving current I3 to the third light-emitting element 304. In the embodiments of the present application, an example is given in which the light-emitting color of the third light-emitting element 304 is different from that of the first light-emitting element 202 and the second light-emitting element 302.

[0064] When the display screen of the display panel A10 is in the white balance state, the first light-emitting driving current I1 is greater than the third light-emitting driving current I3. Additionally, in terms of the maximum light-emitting driving current required by the first light-emitting element 202 and the maximum light-emitting driving current required by the third light-emitting element 304, the maximum value of the maximum light-emitting driving current required by the first light-emitting element 202 is also greater than the maximum light-emitting driving current required by the third light-emitting element 304. Combining the above, the first light-emitting element 202 is a light-emitting element driven by a large current, and the third light-emitting element 304 can be a light-emitting element driven by a small current similar to the second light-emitting element 302.

[0065] Then, the coupling degree between the first power supply voltage trace PVDD electrically connected to the third pixel circuit 303 and other traces is similar to the coupling degree between the partial first power supply voltage trace PVDD electrically connected to the second pixel circuit 301 and other traces, and both are less than the coupling degree between the partial first power supply voltage trace PVDD electrically connected to the first pixel circuit 201 and other traces. Therefore, due to this difference in coupling degree, it also causes potential fluctuations in the first power supply voltage trace PVDD at the position of the third pixel circuit 303, which is not conducive to the third pixel circuit 303 generating an accurate third light-emitting driving current I3. Thus, in the embodiment of the present application, it is set that the third pixel circuit 303 is also fabricated on the second driving substrate 30, separated from the first pixel circuit 201 on the first driving substrate 20, which is beneficial to reducing the influence of the line coupling in the first pixel circuit 201 on the third pixel circuit 303, thereby improving the working stability of the third pixel circuit 303.

[0066] Optionally, as shown in Figure 9 The first transistor M1 of the third pixel circuit 303 fabricated on the second driving substrate 30 is also electrically connected to the second sub-power supply voltage line PVDD2, which is beneficial to saving the number of first power supply voltage lines PVDD fabricated on the second driving substrate 30.

[0067] Figure 10 A kind provided by the embodiment of the present application Figure 8 The cross-sectional schematic diagram along the B-B' direction.

[0068] In an embodiment of the present application, as shown in Figure 8 、 Figure 10 Along the direction perpendicular to the plane where the display panel A10 is located, the third pixel circuit 303 at least partially overlaps with the first pixel circuit 201 and does not overlap with the third light-emitting element 304 and the second light-emitting element 302.

[0069] The third pixel circuit 303 is located in the second driving substrate 30. Optionally, the third light-emitting element 304 is located on the side of the second driving substrate 30 facing the backlight surface of the display panel A10. The third pixel circuit 303 is located on the side of the third light-emitting element 304 facing the light-emitting surface of the display panel A10. In the embodiment of the present application, taking the third light-emitting element 304 and the second light-emitting element 302 as bottom-emitting light sources for example, the side of the third light-emitting element 304 facing the light-emitting surface of the display panel A10 includes an electrode, and this electrode is electrically connected to the third pixel circuit 303. Moreover, the side of the third light-emitting element 304 facing the light-emitting surface of the display panel A10 is the light-emitting surface of the display panel A10, so that the light-emitting direction of the third light-emitting element 304 is the same as that of the first light-emitting element 202 and the second light-emitting element 302.

[0070] In the embodiment of the present application, setting the third pixel circuit 303 to at least partially overlap with the first pixel circuit 201 is beneficial to reducing the planar space of the display panel A10 occupied by the third pixel circuit 303 and the first pixel circuit 201, and improving the space utilization rate of the display panel A10. Moreover, both the third pixel circuit 303 and the first pixel circuit 201 pose a risk of blocking the third light-emitting element 304. Preparing the third pixel circuit 303 and the first pixel circuit 201 to at least partially overlap is beneficial to reducing the projected area of the third pixel circuit 303 and the first pixel circuit 201 on the second driving substrate 20, thereby reducing the risk of the third light-emitting element 304 being blocked, and also providing conditions for the third light-emitting element 304 to emit light normally.

[0071] In addition, exemplarily, as Figure 8 、 Figure 10 shown, the pixels in the display panel A10 may include at least one first light-emitting element 202, at least one second light-emitting element 302, and at least one third light-emitting element 304. Along the direction perpendicular to the plane where the display panel A10 is located, the first light-emitting element 202, the second light-emitting element 302, and the third light-emitting element 304 do not overlap, and the three light-emitting elements can be arranged in sequence along the first direction X1 in the plane parallel to the plane where the display panel A10 is located. Among them, the area occupied by the first pixel circuit 201 is larger than that of the second pixel circuit 301 and the third pixel circuit 303, and the first pixel circuit 201 can at least partially overlap with at least one of the second pixel circuits 301.

[0072] In an embodiment of the present application, one of the second light-emitting element 302 and the third light-emitting element 304 is a blue light-emitting element, and the other is a green light-emitting element. In the embodiment of the present application, the second light-emitting element 302 and the third light-emitting element 304 can be blue light-emitting elements and green light-emitting elements with relatively high luminous efficiency.

[0073] In the embodiment of the present application, the first light-emitting element 201 is taken as an example of a red light-emitting element for illustration.

[0074] Optionally, as Figure 10 shown, in the direction perpendicular to the plane of the display panel A10, the first driving substrate 20 is located on the side of the second driving substrate 30 facing the light-emitting surface of the display panel A10; the blue light-emitting element and the green light-emitting element are both located on the side of the second driving substrate 30 away from the light-emitting surface of the display panel A10. The red light-emitting element with lower luminous efficiency is arranged on the side of the first driving substrate 20 facing the light-emitting surface of the display panel A10, which is beneficial to ensuring that the light-emitting efficiency of the red light-emitting element will not be further reduced due to the shielding of the first driving substrate 20 and the second driving substrate 30, and is beneficial to ensuring the stable display of the display panel A10.

[0075] Figure 11 It is a schematic plan view of another display panel provided by the embodiment of the present application. Figure 12 It is a kind of provided by the embodiment of the present application Figure 11 The cross-sectional view along the C-C' direction.

[0076] Alternatively, optionally, in combination with Figure 11 、 Figure 12 shown, the first driving substrate 20 is located on the side of the second driving substrate 30 facing the light-emitting surface of the display panel A10. The blue light-emitting element and the green light-emitting element, that is, the second light-emitting element 302 and the third light-emitting element 304, are both fabricated on the first driving substrate 20. At this time, the second light-emitting element 202 and the third light-emitting element 304 here can be top-emitting elements. The red light-emitting element, that is, the first light-emitting element 201, can be located on the side of the second driving substrate 30 away from the light-emitting surface of the display panel A10. The red light-emitting element here can be a bottom-emitting element, so that the red light-emitting element can emit light normally through the first driving substrate 20 and the second driving substrate 30.

[0077] Figure 13 It is a schematic plan view of a display device provided by the embodiment of the present application.

[0078] The embodiment of the present application provides a display device B10. As Figure 13 shown, the display device B10 includes the display panel A10 proposed in any one of the above embodiments. Optionally, the display device B10 can be a device for display such as a computer, a television, a mobile phone, etc.

[0079] In the display device B10, the display panel A10 is provided with a first driving substrate 20 and a second driving substrate 30. The first pixel circuit 201 and the first light-emitting element 202 are both fabricated on the first driving substrate 20, and the second pixel circuit 301 and the second light-emitting element 302 are both fabricated on the second driving substrate 30. This is beneficial for separately fabricating the first pixel circuit 201 and the second pixel circuit 301, increasing the safety distance between the first pixel circuit 201 and the second pixel circuit 301, and reducing the influence of routing coupling between the two pixel circuits. Moreover, it is beneficial to provide conditions for separately fabricating the power supply lines that are more affected by coupling on different driving substrates, and for different light-emitting elements to receive more accurate light-emitting driving currents, which is beneficial to improving the light-emitting accuracy of the light-emitting elements and the display uniformity of the display panel.

[0080] Figure 14 It is a flowchart of a method for manufacturing a display panel provided by an embodiment of the present application.

[0081] An embodiment of the present application provides a method for manufacturing a display panel A10, as Figure 14 shown, for manufacturing the display panel A10 proposed in the above embodiment.

[0082] The manufacturing method includes: S1: Provide a first substrate 10A and a second substrate 10B.

[0083] S2: Fabricate a first pixel circuit 201 on one side of the first substrate 10A to obtain a first driving substrate 20; and fabricate a second pixel circuit 301 on one side of the second substrate 10B to obtain a second driving substrate 30.

[0084] S3: Fabricate a first light-emitting element 202 on the side of the first pixel circuit 201 away from the first substrate 10A, and fabricate a second light-emitting element 302 on the side of the second pixel circuit 301 away from the second substrate 10B.

[0085] S4: Fabricate a first encapsulation layer 40 on the surface of the first light-emitting element 202, and fabricate a second encapsulation layer 50 on the surface of the second light-emitting element 302. The first encapsulation layer 40 can be used to protect the first light-emitting element 202, and the second encapsulation layer 50 can be used to protect the second light-emitting element 302.

[0086] S5: Bond the side of the first substrate 10A away from the first pixel circuit 201 to the side of the second substrate 10B away from the second pixel circuit 301 to obtain the display panel A10.

[0087] In the embodiment of the present application, the first driving substrate 20 and the second driving substrate 30 are respectively prepared, and then the prepared second driving substrate 20 and the second driving substrate 30 are bonded to obtain a display panel A10 in which the first light-emitting element 202 and the second light-emitting element 302 are relatively positioned in the vertical direction.

[0088] Figure 15 It is a flowchart of another method for manufacturing a display panel provided by an embodiment of the present application.

[0089] In an embodiment of the present application, in combination with Figure 14 、 Figure 15 As shown, a second pixel circuit 302 is fabricated on one side of the second substrate 10B to obtain a second driving substrate 30, including: S21: Fabricate a second pixel circuit 301 and a third pixel circuit 304 on one side of the second substrate 10B to obtain a second driving substrate 30.

[0090] A second light-emitting element 302 is fabricated on the side of the second pixel circuit 301 away from the second substrate 10B, including: S31: Fabricate a second light-emitting element 302 on the side of the second pixel circuit 302 away from the second substrate 10B, and fabricate a third light-emitting element 302 on the side of the third pixel circuit 304 away from the second substrate 10B.

[0091] The display panel A10 further includes a third light-emitting element 304 and a third pixel circuit 303 for driving the third light-emitting element 304. The third light-emitting element 304 is a small-current-driven light-emitting element compared with the first light-emitting element 202. Therefore, the third light-emitting element 304 and the second light-emitting element 302 are simultaneously fabricated on the side of the second driving substrate 30 away from the second substrate 10B, and both the second pixel circuit 301 and the third pixel circuit 303 are located on the second driving substrate 30, which is beneficial to reducing the influence of the circuit coupling degree in the first pixel circuit 201 on the second pixel circuit 301 and the third pixel circuit 303.

[0092] Figure 16 It is a flowchart of another method for manufacturing a display panel provided by an embodiment of the present application.

[0093] Another manufacturing method for manufacturing the display panel A10 in the above embodiment is provided in an embodiment of the present application. As Figure 16 shown, the manufacturing method includes: S6: Provide a first substrate 10A.

[0094] S7: Fabricate a first pixel circuit 201 on one side of the first substrate 10A to obtain a first driving substrate 20.

[0095] S8: Prepare a first light-emitting element 202 on the side of the first pixel circuit 201 away from the first substrate 10A.

[0096] S9: Prepare a first encapsulation layer 40 on the surface of the first light-emitting element 202.

[0097] S10: Prepare a second pixel circuit 302 on the side of the first substrate 10A away from the first light-emitting element 202 to obtain a second driving substrate 30. When preparing the second driving substrate 30, there is no need to add an additional process for substrate preparation. Directly preparing the second pixel circuit 302 on the side of the first substrate 10A away from the first pixel circuit 201 is beneficial to saving the process of preparing the substrate 10 and reducing the film layer complexity of the display panel A10.

[0098] S11: Prepare a second light-emitting element 202 on the side of the second pixel circuit 302 away from the first substrate 10A.

[0099] S12: Prepare a second encapsulation layer 50 on the surface of the second light-emitting element 202 away from the first substrate 10A to obtain the display panel A10.

[0100] Figure 17 It is a flowchart of another method for preparing a display panel provided by an embodiment of the present application.

[0101] In an embodiment of the present application, as shown in Figure 16 、 Figure 17 S10: Prepare a second pixel circuit 302 on the side of the first substrate 10A away from the first light-emitting element 202 to obtain a second driving substrate 30, including: S13: Prepare a second pixel circuit 201 and a third pixel circuit 302 on the side of the first substrate 10A away from the first light-emitting element 202 to obtain a second driving substrate 30.

[0102] S11: Prepare a second light-emitting element 302 on the side of the second pixel circuit 302 away from the second substrate 10B, including: S14: Prepare a second light-emitting element 302 on the side of the second pixel circuit 302 away from the second substrate 10B, and prepare a third light-emitting element 304 on the side of the third pixel circuit 304 away from the second substrate 10B.

[0103] Finally, prepare a second encapsulation layer 50 for protecting the second light-emitting element 302 and the third light-emitting element 304 to obtain the display panel A10.

[0104] The above are only the preferred embodiments of the present application and are not intended to limit the present application. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present application shall be included within the scope of protection of the present application.

Claims

1. A display panel, characterized in that: include: substrate; A first driving substrate, located at one side of the substrate; the first driving substrate comprises a first pixel circuit, and the first pixel circuit is used to provide a first light-emitting driving current to the first light-emitting element; A second driving substrate is located at a side of the substrate away from the first driving substrate; the second driving substrate comprises a second pixel circuit, and the second pixel circuit is used to provide a second light-emitting driving current to the second light-emitting element; When the display image of the display panel is in a white balance state, the first light-emitting driving current is greater than the second light-emitting driving current.

2. The display panel according to claim 1, characterized in that: The first light emitting element is a red light emitting element.

3. The display panel according to claim 1, characterized in that: The display panel includes a first power supply voltage line; the first power supply voltage line includes a first sub-power supply voltage line and a second sub-power supply voltage line that transmit the same type of signal, the first pixel circuit is electrically connected to the first sub-power supply voltage line, and the second pixel circuit is electrically connected to the second sub-power supply voltage line; The first sub-power supply voltage line is located on the first driving substrate, and the second sub-power supply voltage line is located on the second driving substrate.

4. The display panel according to claim 3, characterized in that: The first sub power supply voltage line and the second sub power supply voltage line have the same potential.

5. The display panel according to claim 3, characterized in that: The first sub power supply voltage line and the second sub power supply voltage line have different potentials.

6. The display panel according to claim 1, characterized in that: The pixel circuit includes a first transistor and a second transistor, wherein the first transistor is electrically connected between the first power supply voltage line and a driving transistor, the second transistor is electrically connected between the driving transistor and a light-emitting element, and the driving transistor is used to generate a light-emitting driving current to the light-emitting element; Among them, the sizes of the first transistor and the second transistor in the first pixel circuit are larger than the sizes of the first transistor and the second transistor in the second pixel circuit.

7. The display panel according to claim 6, characterized in that: The display panel further includes a plurality of cascaded shift register circuits, and output ends of at least some of the shift register circuits are electrically connected to the pixel circuit; the shift register circuit includes a first sub-shift register circuit and a second sub-shift register circuit, the first sub-shift register circuit is electrically connected to the first pixel circuit, and the second sub-shift register circuit is electrically connected to the second pixel circuit; The first sub-shift register circuit is located on the first driving substrate, and the second sub-shift register circuit is located on the second driving substrate.

8. The display panel according to claim 6, characterized in that: The display panel further includes a plurality of cascaded shift register circuits, and output ends of at least some of the shift register circuits are electrically connected to the pixel circuit; the shift register circuit includes a first sub-shift register circuit and a second sub-shift register circuit, the first sub-shift register circuit is electrically connected to the first pixel circuit, and the second sub-shift register circuit is electrically connected to the second pixel circuit; Wherein, the first sub-shift register circuit and the second sub-shift register circuit are both located on the second driving substrate.

9. The display panel according to claim 8, characterized in that: The substrate is a flexible substrate, and an output end of the first sub-shift register circuit is electrically connected to the first pixel circuit through a punch hole.

10. The display panel according to claim 1, characterized in that: The first light emitting element is located on a side of the first driving substrate facing the light emitting surface of the display panel, and the second light emitting element is located on a side of the second driving substrate facing the backlight surface of the display panel; Wherein, each light emitting element includes a light emitting surface, the light emitting surface of the first light emitting element is a surface of the first light emitting element away from the first driving substrate, and the light emitting surface of the second light emitting element is a surface of the second light emitting element facing the second driving substrate.

11. The display panel according to claim 10, characterized in that: Along a direction perpendicular to the plane where the display panel is located, the first light emitting element and the second light emitting element do not overlap.

12. The display panel according to claim 11, characterized in that: Along a direction perpendicular to the plane where the display panel is located, the first pixel circuit at least partially overlaps with the second pixel circuit and does not overlap with the second light-emitting element.

13. The display panel according to claim 11, characterized in that: Along a direction perpendicular to a plane where the display panel is located, the first pixel circuit at least partially overlaps with the first light-emitting element.

14. The display panel according to claim 10, characterized in that: The light-emitting element includes a first electrode, and the first electrode of the light-emitting element is electrically connected to the pixel circuit; the first electrode of the second light-emitting element is located on the side of the second light-emitting element facing the second driving substrate; the second light-emitting element includes a light-emitting area and an electrode area arranged along a first direction, and the first direction is parallel to the plane where the second light-emitting element is located; the electrode area can be used to prepare the first electrode of the second light-emitting element, and the light-emitting area is used to emit at least part of the light emitted by the second light-emitting element; The first driving substrate and the second driving substrate both include transparent areas overlapping along a direction perpendicular to the plane where the display panel is located, and the light-emitting area at least partially overlaps with the transparent area along a direction perpendicular to the plane where the display panel is located.

15. The display panel according to claim 14, characterized in that: The film layer material in the transparent area includes transparent material.

16. The display panel according to claim 1, characterized in that: The second driving substrate further includes a third pixel circuit, and the third pixel circuit is used to provide a third light-emitting driving current to the third light-emitting element; When the display image of the display panel is in a white balance state, the first light-emitting driving current is greater than the third light-emitting driving current.

17. The display panel according to claim 16, characterized in that: Along a direction perpendicular to the plane where the display panel is located, the third pixel circuit at least partially overlaps with the first pixel circuit and does not overlap with the third light-emitting element and the second light-emitting element.

18. The display panel according to claim 16, characterized in that: One of the second light emitting element and the third light emitting element is a blue light emitting element, and the other is a green light emitting element.

19. A display device, characterized in that: Comprising a display panel as described in any one of claims 1-18.

20. A method for preparing a display panel, characterized in that: Used for preparing a display panel according to any one of claims 1 to 18; the preparation method comprises: providing a first substrate and providing a second substrate; A first pixel circuit is prepared on one side of the first substrate to obtain a first driving substrate; and a second pixel circuit is prepared on one side of the second substrate to obtain a second driving substrate; A first light-emitting element is prepared on a side of the first pixel circuit away from the first substrate, and a second light-emitting element is prepared on a side of the second pixel circuit away from the second substrate; Preparing a first encapsulation layer on the surface of the first light-emitting element, and preparing a second encapsulation layer on the surface of the second light-emitting element; The display panel is obtained by bonding a side of the first substrate away from the first pixel circuit to a side of the second substrate away from the second pixel circuit.

21. The preparation method according to claim 20, characterized in that: The second pixel circuit is prepared on one side of the second substrate to obtain the second driving substrate, comprising: The second pixel circuit and the third pixel circuit are prepared on one side of the second substrate to obtain the second driving substrate; The step of preparing a second light-emitting element on a side of the second pixel circuit away from the second substrate comprises: A second light-emitting element is prepared on a side of the second pixel circuit away from the second substrate, and a third light-emitting element is prepared on a side of the third pixel circuit away from the second substrate.

22. A method for preparing a display panel, characterized in that: Used for preparing a display panel according to any one of claims 1 to 18; the preparation method comprises: providing a first substrate; Preparing a first pixel circuit on one side of the first substrate to obtain a first driving substrate; Preparing a first light-emitting element on a side of the first pixel circuit away from the first substrate; Prepare a first encapsulation layer on the surface of the first light-emitting element; Preparing a second pixel circuit on a side of the first substrate away from the first light-emitting element to obtain the second driving substrate; Preparing a second light-emitting element on a side of the second pixel circuit away from the first substrate; A second encapsulation layer is prepared on a surface of the second light-emitting element away from the first substrate to obtain the display panel.

23. The preparation method according to claim 22, characterized in that: The second pixel circuit is prepared on a side of the first substrate away from the first light-emitting element to obtain the second driving substrate, comprising: The second pixel circuit and the third pixel circuit are prepared on a side of the first substrate away from the first light-emitting element to obtain the second driving substrate; The step of preparing a second light-emitting element on a side of the second pixel circuit away from the second substrate comprises: A second light-emitting element is prepared on a side of the second pixel circuit away from the second substrate, and a third light-emitting element is prepared on a side of the third pixel circuit away from the second substrate.

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