Display panel, preparation method thereof and display device

Abstract

The invention discloses a display panel and a preparation method thereof and a display device, a pixel circuit in the display panel comprises a switch module, the switch module comprises a first electrode, a second electrode and a dielectric elastic part located between the first electrode and the second electrode in the direction perpendicular to the plane where a substrate is located, the second electrode is located on the side, away from the substrate, of the first electrode, and the dielectric elastic part is located between the first electrode and the second electrode. The first electrode and the second electrode are insulated; the second electrode comprises a first branch part and a second branch part which are arranged on the same layer; the first electrode is electrically connected with a control signal line, and the control signal line is used for transmitting a control signal; when the control signal is in a non-enabling state, the dielectric elastic part is in an initial state, a first gap is formed between the first branch part and the second branch part, and the second branch part is in a suspended state; and when the control signal is in an enabling state, the dielectric elastic part is in a first state, the first branch part is in contact with the second branch part, and the first branch part and the second branch part are equipotential. The pixel circuit can solve the problems caused by current leakage of a switching device, and the display effect is improved.

Description

Technical Field

[0001] The present invention relates to the field of display technologies, and particularly to a display panel, a preparation method thereof, and a display device. Background Art

[0002] The pixel circuit in a display panel is used to drive a light-emitting element to emit light, so that the display panel displays a specific picture. As the requirement for the display quality of the display panel is getting higher and higher, the corresponding requirement for the performance of the pixel circuit is also getting higher and higher.

[0003] However, due to the leakage phenomenon of switching devices (such as thin film transistors, abbreviated as TFTs), existing pixel circuits have problems such as uneven display and flicker. Currently, the commonly used solution is to use double-gate TFTs or oxide semiconductor TFTs. However, this solution not only has complex processes and high costs, but also a high voltage will be coupled out at the intermediate node of the double-gate TFT when the TFT is turned off, and the voltage difference from the gate voltage of the driving transistor is very large, and the leakage reduction effect is limited. Summary of the Invention

[0004] The present invention provides a display panel, a preparation method thereof, and a display device to solve the problems caused by the leakage current of the switching device in the pixel circuit and improve the display effect.

[0005] According to an aspect of the present invention, a display panel is provided, including:

[0006] A substrate,

[0007] A driving circuit layer located on one side of the substrate; the driving circuit layer includes a pixel circuit, the pixel circuit includes a driving transistor and at least one switching module, and the switching module is coupled to the driving transistor;

[0008] Along a first direction, the switching module includes a first electrode, a second electrode, and a dielectric elastomer portion located between the first electrode and the second electrode. The second electrode is located on the side of the first electrode away from the substrate and is insulated from the first electrode; the first direction is perpendicular to the plane where the substrate is located;

[0009] The second electrode includes a first part and a second part arranged in the same layer; the first electrode, the dielectric elastomer portion, and the first part overlap in projection along the first direction, and the dielectric elastomer portion and the second part do not overlap in projection along the first direction; the projection range of the dielectric elastomer portion on the substrate along a second direction is larger than the projection range of the first electrode on the substrate along the second direction, and the projection range of the first part on the substrate along the second direction is larger than the projection range of the dielectric elastomer portion on the substrate along the second direction; the second direction is the direction from the first part to the second part and is parallel to the plane where the substrate is located;

[0010] The first electrode is electrically connected to a control signal line for transmitting a control signal. When the control signal is in a non-enabled state, the dielectric elastomer part is in an initial state, there is a first gap between the first part and the second part, and the second part is in a suspended state. When the control signal is in an enabled state, the dielectric elastomer part is in a first state, the first part contacts the second part, and the first part and the second part are at the same potential.

[0011] According to another aspect of the present invention, there is provided a method for manufacturing a display panel, including:

[0012] Providing a substrate;

[0013] Forming a driving circuit layer on one side of the substrate. The driving circuit layer includes a pixel circuit, and the pixel circuit includes a driving transistor and at least one switching module. The switching module is coupled to the driving transistor. Along a first direction, the switching module includes a first electrode, a second electrode, and a dielectric elastomer part located between the first electrode and the second electrode. The second electrode is located on a side of the first electrode away from the substrate and is insulated from the first electrode. The first direction is perpendicular to the plane of the substrate. The second electrode includes a first part and a second part arranged in the same layer. The first electrode, the dielectric elastomer part, and the first part overlap in projection along the first direction, and the dielectric elastomer part and the second part do not overlap in projection along the first direction. The projection range of the dielectric elastomer part on the substrate along a second direction is greater than the projection range of the first electrode on the substrate along the second direction, and the projection range of the first part on the substrate along the second direction is greater than the projection range of the dielectric elastomer part on the substrate along the second direction. The second direction is the direction from the first part to the second part and is parallel to the plane of the substrate;

[0014] Wherein, the first electrode is electrically connected to a control signal line for transmitting a control signal. When the control signal is in a non-enabled state, the dielectric elastomer part is in an initial state, there is a first gap between the first part and the second part, and the second part is in a suspended state. When the control signal is in an enabled state, the dielectric elastomer part is in a first state, the first part contacts the second part, and the first part and the second part are at the same potential.

[0015] According to still another aspect of the present invention, there is provided a display device including the display panel provided in any embodiment of the present invention.

[0016] The technical solution of the embodiment of the present invention designs the pixel circuit of the display panel to have the following switching module: along the first direction perpendicular to the plane where the substrate is located, the switching module includes a first electrode, a second electrode, and a dielectric elastomer portion located between the first electrode and the second electrode. The second electrode is located on the side of the first electrode away from the substrate and is insulated from the first electrode. The second electrode includes a first branch and a second branch arranged in the same layer. The first electrode, the dielectric elastomer portion, and the first branch overlap in projection along the first direction, and the dielectric elastomer portion does not overlap with the second branch in projection along the first direction. The projection range of the dielectric elastomer portion on the substrate along the second direction is greater than the projection range of the first electrode on the substrate along the second direction, and the projection range of the first branch on the substrate along the second direction is greater than the projection range of the dielectric elastomer portion on the substrate along the second direction. The first electrode is electrically connected to a control signal line for transmitting a control signal. In this way, by adjusting the voltage magnitude of the control signal, the state of the dielectric elastomer module can be adjusted, and further the on / off of the switching module can be controlled. Specifically, when the control signal is in a non-enabled state, the dielectric elastomer portion is in an initial state, there is a first gap between the first branch and the second branch, and the second branch is in a suspended state, so that the switching module is turned off. When the control signal is in an enabled state, the dielectric elastomer portion is in a first state, the first branch and the second branch are in contact, and the first branch and the second branch are at the same potential, realizing the on-control of the switching module. Since the inside of the second electrode is in an open-circuit state when the switching module is turned off, the possibility of leakage current can be eliminated, and the problem caused by the leakage current of the switching device can be completely solved.

[0017] It should be understood that the content described in this part is not intended to identify the key or important features of the embodiments of the present invention, nor is it used to limit the scope of the present invention. Other features of the present invention will become easily understood through the following description. Brief Description of the Drawings

[0018] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the following will briefly introduce the drawings required for the description of the embodiments. Obviously, the drawings in the following description are only some embodiments of the present invention. For those of ordinary skill in the art, other drawings can be obtained based on these drawings without creative efforts.

[0019] Figure 1 is a schematic structural diagram of a display panel provided by an embodiment of the present invention;

[0020] Figure 2 is Figure 1 a schematic structural diagram of a sub-pixel in the provided display panel;

[0021] Figure 3 is Figure 2 a top-view structural diagram of the switching module in the shown sub-pixel in an initial state;

[0022] Figure 4 is the schematic cross-sectional structure taken along Figure 3 BB' in the middle;

[0023] Figure 5 is Figure 2 the schematic top view structure of the switch module in the first state in the sub-pixel shown;

[0024] Figure 6 is Figure 1 another schematic structure of the sub-pixel in the display panel provided;

[0025] Figure 7 is Figure 6 the schematic film layer structure of the pixel circuit in the sub-pixel shown;

[0026] Figure 8 is Figure 7 the enlarged structure schematic of the Q1 area in the middle;

[0027] Figure 9 is taken along Figure 7 CC' in the middle;

[0028] Figure 10 is Figure 6 the working timing diagram of the pixel circuit in the middle;

[0029] Figure 11 is taken along Figure 7 CC' in the middle;

[0030] Figure 12 is taken along Figure 7 CC' in the middle;

[0031] Figure 13 is taken along Figure 7 CC' in the middle;

[0032] Figure 14 is the schematic film layer structure of another switch module in the initial state provided by the embodiment of the present invention;

[0033] Figure 15 is the schematic film layer structure of another switch module in the first state provided by the embodiment of the present invention;

[0034] Figure 16 is taken along Figure 14 LL' in the middle;

[0035] Figure 17 is taken along Figure 14 LL' in the middle;

[0036] Figure 18 is another schematic cross-sectional structure diagram taken along Figure 14 LL' in the middle;

[0037] Figure 19 is another schematic cross-sectional structure diagram taken along Figure 14 LL' in the middle;

[0038] Figure 20 is a schematic flowchart of a method for manufacturing a display panel provided by an embodiment of the present invention;

[0039] Figures 21 - 30 is a schematic flowchart of a manufacturing process of a display panel corresponding to Figure 11 ;

[0040] Figure 31 is a schematic structural diagram of a display device provided by an embodiment of the present invention. Detailed implementation manners

[0041] In order to enable those skilled in the art to better understand the solution of the present invention, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

[0042] Without departing from the spirit or scope of the present application, various modifications and changes can be made to the present application, which will be obvious to those skilled in the art. Therefore, the present application is intended to cover the modifications and changes of the present application that fall within the scope of the corresponding claims (the claimed technical solutions) and their equivalents. It should be noted that the embodiments provided in the embodiments of the present application can be combined with each other without conflict.

[0043] First of all, it should be noted that unless otherwise defined, the technical terms or scientific terms used in this invention should have the ordinary meanings understood by those with ordinary skills in the field to which this invention belongs. The "first", "second" and similar terms used in this invention do not denote any order, quantity or importance, but are only used to distinguish different components. "Including" and its similar terms mean that the elements or objects appearing before this word cover the elements or objects listed after this word and their equivalents, without excluding other elements or objects. "Connection" or "connected" and similar terms are not limited to physical or mechanical connections, but may include electrical connections, whether direct or indirect. Similar terms such as "upper", "lower", "left" and "right" are only used to represent relative positional relationships. When the absolute position of the object being described changes, the relative positional relationship may also change accordingly. In addition, the shapes and sizes of the components in the drawings do not reflect the true proportions, and the purpose is only to schematically illustrate the content of this invention.

[0044] Figure 1 is a schematic structural diagram of a display panel provided by an embodiment of the present invention. Figure 2 is Figure 1 a schematic structural diagram of a sub-pixel in the provided display panel. Figure 3 is Figure 2 a top-view structural diagram of the switch module in the shown sub-pixel in the initial state. Figure 4 is along Figure 3 the cross-sectional structural diagram taken along BB' in Figure 5 is Figure 2 a top-view structural diagram of the switch module in the shown sub-pixel in the first state, combined with Figures 1 - 5, the display panel 100 provided by the embodiment of the present invention includes a substrate 10 and a driving circuit layer 20, and the driving circuit layer 20 is located on one side of the substrate 10; the driving circuit layer 20 includes a pixel circuit 210, and the pixel circuit 210 includes a driving transistor T0 and at least one switching module K, and the switching module K is coupled to the driving transistor T; along the first direction D1, the switching module K includes a first electrode 21, a second electrode 22, and a dielectric elastomer part 23 located between the first electrode 21 and the second electrode 22, and the second electrode 22 is located on the side of the first electrode 21 away from the substrate 10 and is insulated from the first electrode 21; the first direction D1 is perpendicular to the plane where the substrate 10 is located; the second electrode 22 includes a first part 221 and a second part 222 arranged in the same layer; the first electrode 21, the dielectric elastomer part 23, and the first part 221 overlap in projection along the first direction D1, and the dielectric elastomer part 23 and the second part 22 do not overlap in projection along the first direction D1; the projection range of the dielectric elastomer part 23 on the substrate 10 along the second direction D2 is greater than the projection range of the first electrode 21 on the substrate 10 along the second direction D2, and the projection range of the first part 221 on the substrate 10 along the second direction D2 is greater than the projection range of the dielectric elastomer part 23 on the substrate 10 along the second direction D2; the second direction D2 is the direction from the first part 221 to the second part 222 and is parallel to the plane where the substrate 10 is located; the first electrode 21 is electrically connected to a control signal line 4, and the control signal line 4 is used for transmitting a control signal; when the control signal is in a non-enabled state, the dielectric elastomer part 23 is in an initial state, and there is a first gap h between the first part 221 and the second part 222, and the second part 222 is in a suspended state (such as Figure 3 ); when the control signal is in an enabled state, the dielectric elastomer part 23 is in a first state, the first part 221 is in contact with the second part 222, and the first part 221 and the second part 222 are at the same potential (such as Figure 5 ).

[0045] Such as Figure 1 And Figure 2As shown, the display panel 100 includes a plurality of sub-pixels PX, and the sub-pixels PX are electrically connected by a light-emitting element 30 and a pixel circuit 210 for driving the light-emitting element 30 to emit light. Among them, the light-emitting element 30 can be a light-emitting diode, including but not limited to OLED, micro-LED, and mini-LED, etc. Currently, the commonly used pixel circuit is composed of several thin-film transistors and storage capacitors electrically connected, such as 2T1C pixel circuit, 7T1C pixel circuit, and 8T1C pixel circuit ("T" represents thin-film transistor, "C" represents capacitor), etc. The thin-film transistors in such pixel circuits can be divided into two categories. One is a switching transistor, which plays the role of signal transmission on and off, and the other is a driving transistor, which is used to generate a driving current for driving the light-emitting element to emit light. As described above, due to the leakage current problem of the switching transistor, the display effect of the display panel is affected. In response to this, the embodiment of the present invention designs a new type of switching device (i.e., the above-mentioned switching module K) to replace the switching transistor, solve the leakage current problem, and improve the display effect. In practical applications, the switching module in the embodiment of the present invention can be used to replace at least some of the switching transistors in the original pixel circuit, and the embodiment of the present invention does not limit this.

[0046] Specifically, in combination with Figures 2 - 5 , from bottom to top, the switching module K sequentially includes a first electrode 21, a dielectric elastomer part 23, and a second electrode 22. The first electrode 21 and the second electrode 22 are insulated from each other. The second electrode 22 has two parts, a first part 221 and a second part 222. The first electrode 21, the dielectric elastomer part 23, and the first part 221 of the second electrode 22 overlap in the projection along the first direction D1. The second part 22 does not overlap with the dielectric elastomer part 23 in the projection along the first direction D1. The projection range of the dielectric elastomer part 23 along the second direction D2 on the substrate 10 is larger than the projection range of the first electrode 21 along the second direction D2 on the substrate 10 to ensure the insulation between the first electrode 21 and the second electrode 22. In addition, the projection range of the first part 221 along the second direction D2 on the substrate 10 is larger than the projection range of the dielectric elastomer part 23 along the second direction D2 on the substrate 10.

[0047] Among them, the dielectric elastomer part 23 has the characteristic of electro-deformation. Based on the above structure, since the dielectric elastomer part 23 is located between the first electrode 21 and the first part 221 of the second electrode 22, therefore, based on the voltage control on the first electrode 21 and the first part 221 of the second electrode 22, the dielectric elastomer part 23 can have different states, specifically an initial state and a first state. When the dielectric elastomer part 23 has different states, the switching module K has different on-off states: when the dielectric elastomer part 23 is in the initial state, the switching module K is in the off state, and when the dielectric elastomer part 23 is in the first state, the switching module K is in the on state. The working principle will be described in detail below.

[0048] Referring toFigures 2 - 4 , both ends (i - end and j - end) of the second electrode 22 of the switch module K are connected in series between two nodes of the circuit. When the switch module K is in the conducting state, an electrical signal (such as a DATA signal) is transmitted from the i - end to the j - end. In other words, the i - end can be understood as the input end of the switch module K, and the j - end can be understood as the output end of the switch module K. Therefore, the first part 221 where the i - end is located is always at the same potential as the node it is connected to, while the potential of the second part 221 where the j - end is located depends on the on - off state of the switch module K.

[0049] Furthermore, the first electrode 21 is electrically connected to the control signal line 4. Therefore, the potential on the first electrode 21 is determined by the voltage of the control signal transmitted on the control signal line 4. Also, since the voltage of the first part 221 of the second electrode 22 can be determined according to the electrical signal it accesses, by adjusting the voltage magnitude of the control signal, the electric field between the first electrode 21 and the first part 221 of the second electrode 22 can be adjusted, thereby adjusting the state of the dielectric elastomer part 23 to achieve the on - off control of the switch module K.

[0050] Refer to Figure 3 , when the control signal on the control signal line 4 is in the non - enabling state, the dielectric elastomer part 23 is in the initial state, and there is a first gap h between the first part 221 and the second part 222 of the second electrode 22. The second part 222 is in a suspended state. At this time, the inside of the second electrode 22 is in an open - circuit state, and the switch module K is turned off, and the electrical signal cannot be transmitted from the i - end to the j - end. Refer to Figure 3 , when the switch module K is turned off, since there is a gap between the first part 221 and the second part 222, the second electrode 22 is physically disconnected, and the leakage current is completely zero, which can completely solve all problems caused by leakage current.

[0051] Specifically, the initial state refers to the state when the dielectric elastomer part 23 has not deformed. At this time, there is a gap between the first part 221 and the second part 222. The formation of the gap will be described later.

[0052] Exemplarily, it can be designed that the voltage of the control signal in the non - enabling state has a small difference (the difference can even be 0) from the voltage on the first part 221. In this way, the electric field between the first electrode 221 and the first part 221 of the second electrode 22 is close to 0, the dielectric elastomer part 23 is in the initial state and has not deformed. At this time, there is a gap between the first part 221 and the second part 222, and the inside of the second electrode 22 is in an open - circuit state, making the switch module K turned off.

[0053] Refer to Figure 5, when the control signal on the control signal line 4 is in the enabled state, the dielectric elastomer part 23 is in the first state, the first branch 221 and the second branch 222 are in contact. At this time, a conduction path exists between the i - end and the j - end of the second electrode 22, the second branch 222 and the first branch 221 are at the same potential, the switch module K is turned on, and the signal on the signal line is transmitted from the i - end to the j - end.

[0054] Specifically, compare Figure 5 and Figure 3 , along the first direction D1, the projection range of the dielectric elastomer part 23 in the first state ( Figure 5 ) is larger than the projection range of the dielectric elastomer part 23 in the initial state ( Figure 3 ). That is, compared with the initial state, the size of the dielectric elastomer part 23 in the first state expands in the direction parallel to the plane of the substrate. Exemplarily, referring to Figure 3 and Figure 5 , in the X - direction, the length of the dielectric elastomer part 23 in the first state is X1, the length of the dielectric elastomer part 23 in the initial state is X0, and X1 > X0. In the Y - direction, the length of the dielectric elastomer part 23 in the first state is Y1, the length of the dielectric elastomer part 23 in the initial state is Y0, and Y1 > Y0. It can be understood that the direction parallel to the plane of the substrate is not limited to the illustrated X - direction and Y - direction, and the size of the dielectric elastomer part 23 also expands in other directions parallel to the plane of the substrate.

[0055] Next, referring to Figure 4 , since the projection range of the first branch 221 on the substrate 10 along the second direction D2 is larger than the projection range of the dielectric elastomer part 23 on the substrate 10 along the second direction D2, the first branch 221 covers the side wall of the dielectric elastomer part 23 along the second direction D2, and the second direction D2 is parallel to the plane of the substrate 10. Therefore, when the dielectric elastomer part 23 expands in the direction parallel to the plane of the substrate, it can drive the first branch 221 to expand, making it contact with the second branch 222, closing the second electrode 22, and realizing the on - control of the switch module K.

[0056] Exemplarily, the voltage of the control signal in the enabled state can be designed to have a large difference and opposite polarity from the voltage on the first division 221. In this way, an electric field can be formed between the first electrode 21 and the first division 221. Under the action of the electric field, positive and negative charges will be generated on the upper and lower surfaces of the dielectric elastic portion 23 respectively. The charges of different shapes on the upper and lower surfaces attract each other, and the charges of the same charge on the same surface repel each other. Electrostatic force or Maxwell stress is generated in the dielectric elastic portion 23, so that the dielectric elastic portion 23 can be compressed in the first direction D1 and expanded in a direction parallel to the plane of the substrate 10, thereby driving the first division 221 to contact the second division 222, closing the second electrode 22, and realizing the conduction control of the switch module K.

[0057] It can be understood that after the display panel is prepared, the dielectric elastic part 23 is in an initial state, and there is a gap between the first division 221 and the second division 222. When the display panel is working, the dielectric elastic part 23 will switch between the initial state and the first state to realize the switching of the off state and the on state of the switch module K.

[0058] It should be noted that different pixel circuits have switch devices with different functions, which are used to control the on and off of the transmission paths of different signals. The signal line connected in series with the second electrode 22 of any switch module K is determined by the role played by the switch module K in the pixel circuit, and the embodiment of the present invention does not limit this. Furthermore, the control signal connected to the first electrode 21 can be adaptively designed according to the signal on the signal line connected in series with the second electrode 22 to control the on and off state of the switch module. This will be explained later in conjunction with a specific pixel circuit.

[0059] In summary, the pixel circuit of the display panel designed in the embodiment of the present invention has the following switching module: along a first direction perpendicular to the plane of the substrate, the switching module includes a first electrode, a second electrode, and a dielectric elastomer portion located between the first electrode and the second electrode. The second electrode is located on the side of the first electrode away from the substrate and is insulated from the first electrode. The second electrode includes a first branch portion and a second branch portion arranged in the same layer. The first electrode, the dielectric elastomer portion, and the first branch portion overlap in projection along the first direction, and the dielectric elastomer portion does not overlap with the second branch portion in projection along the first direction. The projection range of the dielectric elastomer portion on the substrate along a second direction is greater than the projection range of the first electrode on the substrate along the second direction, and the projection range of the first branch portion on the substrate along the second direction is greater than the projection range of the dielectric elastomer portion on the substrate along the second direction. The first electrode is electrically connected to a control signal line for transmitting a control signal. In this way, by adjusting the voltage magnitude of the control signal, the state of the dielectric elastomer module can be adjusted, and further the on / off of the switching module can be controlled. Specifically, when the control signal is in a non-enabled state, the dielectric elastomer portion is in an initial state, there is a first gap between the first branch portion and the second branch portion, and the second branch portion is in a suspended state, so that the switching module is turned off. When the control signal is in an enabled state, the dielectric elastomer portion is in a first state, the first branch portion contacts the second branch portion, and the first branch portion and the second branch portion are at the same potential, realizing the on-control of the switching module. Since the inside of the second electrode is in an open-circuit state when the switching module is turned off, the possibility of leakage current can be eliminated, and the problem caused by the leakage current of the switching device can be completely solved.

[0060] Based on the above embodiments, referring to Figure 3 , optionally, along the direction (D2) from the first branch portion 221 to the second branch portion 222, the width of the first gap h is less than the maximum deformation amount of the dielectric elastomer portion 23. In this way, it can be ensured that the deformation of the dielectric elastomer portion 23 is sufficient to drive the first branch portion 221 to contact the second branch portion 222, so that the second electrode 22 is closed, realizing the on-control of the switching module K.

[0061] Referring to Figure 4 , optionally, the material of the dielectric elastomer portion 23 includes at least one of polyacrylate elastomer, polyurethane elastomer, and silicone rubber. The above materials have the properties of fast response, high dielectric constant, and low elastic modulus, and can quickly respond to the electric field between the first electrode 21 and the first branch portion 221, drive the first branch portion 221 to contact the second branch portion 222, so that the second electrode 22 is closed, realizing the on-control of the switching module K.

[0062] In a specific embodiment, optionally, the dielectric elastomer portion 23 is a polystyrene-b-poly(n-butyl acrylate)-b-polystyrene triblock copolymer added with partially reduced graphene oxide.

[0063] Optionally, when the control signal is in the non-enabled state, |V1 - V2| ≤ Va; when the control signal is in the enabled state, |V1 - V2| ≥ Vb, and the polarities of V1 and V2 are opposite; where V1 represents the voltage on the first electrode, V2 represents the voltage on the first branch, Va represents the first voltage threshold, Vb represents the second voltage threshold, and Va < Vb.

[0064] Among them, the specific values of the first voltage threshold Va and the second voltage threshold Vb can be designed according to the specific material of the dielectric elastomer part 23.

[0065] Specifically, the value of the first voltage threshold Va is small. By designing |V1 - V2| ≤ Va, the electric field between the first electrode 21 and the first branch 221 can be very small or even zero, which is not sufficient to cause the dielectric elastomer part 23 to deform. Thus, it can be ensured that there is a gap between the first branch 221 and the second branch 222, making the inside of the second electrode 22 in an open circuit state and ensuring the complete turn-off of the switch module K.

[0066] Specifically, the value of the second voltage threshold Vb is large. Since the polarities of the voltage V1 on the first electrode 21 and the voltage V2 on the first branch 221 are opposite and the difference between them is large, a large electric field can be generated between the first electrode 21 and the first branch 221, causing the dielectric elastomer part 23 to deform, driving the first branch 221 to contact the second branch 222, and closing the second electrode 22 to realize the on-control of the switch module K.

[0067] In one embodiment, optionally, Va ≤ 3V and Vb ≥ 10V.

[0068] Figure 6 Yes Figure 1 Another schematic structural diagram of a sub-pixel in the provided display panel Figure 7 Yes Figure 6 A schematic diagram of the film layer structure of the pixel circuit in the shown sub-pixel, only schematically shown with all dielectric elastomer parts in the initial state Figure 8 Yes Figure 7 An enlarged structural diagram of the Q1 region in Figure 9 Yes Figure 7 A schematic cross-sectional structure diagram taken along CC' in Figures 6 - 9As shown, optionally, the driving circuit layer 20 includes a first metal layer M1, a dielectric material layer 230, and a second metal layer M2. The dielectric material layer 230 is located on the side of the first metal layer M1 away from the substrate 10, and the second metal layer M2 is located on the side of the dielectric material layer 230 away from the substrate 10. The first electrode 21 is located on the first metal layer M1, the dielectric elastomer 23 is located in the dielectric material layer 230, and the second electrode 22 is located on the second metal layer M2. The driving transistor T includes an active layer (poly), and the second metal layer M2 is located on the side of the active layer (poly) close to the substrate 10.

[0069] In the layout design of the display panel, the film layer structure on the side of the active layer away from the substrate is relatively complex, with various horizontally and vertically intersecting signal lines in the design, such as Figure 6 shown by the initialization signal line Vref, the first power supply signal line ELVDD, the data signal line Data, etc. The film layer structure on the side of the active layer close to the substrate is relatively simple. By arranging the first metal layer M1 where the first electrode 21 in the switch module K is located, the dielectric material layer 230 where the dielectric elastomer 23 is located, and the second metal layer M2 where the second electrode 22 is located on the side of the active layer (poly) close to the substrate 10, the design and fabrication difficulties can be reduced.

[0070] Based on the traditional 7T1C pixel circuit, the improvements of the embodiments of the present invention will be introduced below. The 7T1C pixel circuit includes a driving transistor T and six switching transistors, as Figure 6 shown, six switch modules can be used to replace the six switching transistors in the original 7T1C pixel circuit. By setting like this, the layout design difficulty and the panel fabrication difficulty can be reduced.

[0071] In one embodiment, referring to Figure 7, optionally, the first metal layer M1 includes a first control signal line 41, a second control signal line 42, a third control signal line 43, and a fourth control signal line 44 arranged side by side in sequence; the dielectric material layer 230 includes a first dielectric elastomeric portion 231, a second dielectric elastomeric portion 232, a third dielectric elastomeric portion 233, a fourth dielectric elastomeric portion 234, a fifth dielectric elastomeric portion 235, and a sixth dielectric elastomeric portion 236. The first dielectric elastomeric portion 231 and the first control signal line 41 form a first overlapping region A1 along the first direction D1, the second dielectric elastomeric portion 232 and the fourth control signal line 44 form a second overlapping region A2 along the first direction D1, the third dielectric elastomeric portion 233 and the second control signal line 42 form a third overlapping region A3 along the first direction D1, the fourth dielectric elastomeric portion 234 and the second control signal line 42 form a fourth overlapping region A4 along the first direction D1, the fifth dielectric elastomeric portion 235 and the third control signal line 43 form a fifth overlapping region A5 along the first direction D1, and the sixth dielectric elastomeric portion 236 and the third control signal line 43 form a sixth overlapping region A6 along the first direction D1; the second metal layer M2 includes a first metal trace 51 and a second metal trace 52. Along the first direction D1, the first metal trace 51 simultaneously projects and overlaps with the first overlapping region A1, the second overlapping region A2, the fourth overlapping region A4, and the sixth overlapping region A6, and the second metal trace 52 simultaneously projects and overlaps with the third overlapping region A3 and the fifth overlapping region A5; when the dielectric elastomeric portions 23 in the dielectric material layer 230 are in the initial state, the first metal trace 51 has a first break U1 and a fourth break U4 between the first overlapping region A1 and the fourth overlapping region A4, and a sixth break U6 and a second break U2 between the sixth overlapping region A6 and the second overlapping region A2, and the second metal trace 52 has a third break U3 and a fifth break U5 between the third overlapping region A3 and the fifth overlapping region A5.

[0072] Combined Figure 7 and Figure 8, in region Q1, a part of the first control signal line 41 is multiplexed as the first electrode 21. This part of the first control signal line 41 overlaps with the first dielectric elastomer part 231 along the first direction D1 in projection, forming a first overlapping region A1. The first metal trace 51 has a first break U1 near the first overlapping region A1. Along the extension direction of the first metal trace 51, a part of the first metal trace 51 on one side of the first break U1 overlaps with the first overlapping region A1, and this part of the first metal trace 51 serves as the first sub - part 221 of the second electrode 22. A part of the first metal trace 51 on the other side of the first break U1 does not overlap with the first overlapping region A1, and this part of the first metal trace 51 serves as the second sub - part 222 of the second electrode 22. The first break U1 refers to the first gap h between the first sub - part 221 and the second sub - part 222. Based on the above explanation, it is easy to understand that the structure of the first metal layer M1, the second metal layer M2, and the dielectric material layer 230 in region Q1 forms a switching module, specifically Figure 6 the first switching module K1 in

[0073] Similarly, as shown in combination with Figure 6 and Figure 7 , the structure of the first metal layer M1, the second metal layer M2, and the dielectric material layer 230 in region Q2 forms Figure 6 the second switching module K2 in Figure 6 ; the structure of the first metal layer M1, the second metal layer M2, and the dielectric material layer 230 in region Q3 forms Figure 6 the third switching module K3 in Figure 6 ; the structure of the first metal layer M1, the second metal layer M2, and the dielectric material layer 230 in region Q4 forms Figure 6 the fourth switching module K4 in

[0074] Furthermore, as shown in combination with Figure 7 and Figure 9 , optionally, the positive projection of the active layer (poly) on the substrate 10 is located within the first region; the first region is the region enclosed by the positive projections of the second control signal line 42, the third control signal line 43, the first metal trace 51, and the second metal trace 52 on the substrate 10; the active layer (poly) includes a first end Z1 and a second end Z2, the first end Z1 is overlapped with the first metal trace 51, and the second end Z2 is overlapped with the second metal trace 52.

[0075] Specifically, one of the first end Z1 and the second end Z2 of the active layer (poly) corresponds to the source region, and the other corresponds to the drain region. By disposing the active layer within the region enclosed by the positive projections of the second control signal line 42, the third control signal line 43, the first metal trace 51, and the second metal trace 52 on the substrate 10, and making the active layer located on the side of the second metal layer M2 away from the substrate 10, overlapping the first end Z1 of the active layer with the first metal trace 51, and overlapping the second end Z2 of the active layer with the second metal layer 52, the electrical connection between the driving transistor T shown in Figure 6 and the third switching module K3, the fourth switching module K4, the fifth switching module K5, and the sixth switching module K5 can be achieved, and there is no need for drilling, and the process is simple.

[0076] In addition, in combination with Figure 7 and Figure 8 , the driving circuit layer 20 further includes a third metal layer M3, a fourth metal layer M4, and a fifth metal layer M5. Among them, the third metal layer M3 can be used to set the gate g of the driving transistor T. In this embodiment, the gate g of the driving transistor T is also multiplexed as the bottom electrode e1 of the storage capacitor Cst; the fourth metal layer M4 can be used to set the top electrode e2 of the storage capacitor Cst and the initialization signal line Vref, and the initialization signal line Vref is connected to the first metal trace 51 by drilling; the fifth metal layer M5 can be used to set the first power supply signal line ELVDD and the data signal line Data, and the first power supply signal line ELVDD and the data signal line Data are respectively connected to the second metal trace 52 by drilling. In addition, Figure 7 the via located between the sixth switching module K6 and the second switching module K2 in

[0077] Figure 10 is Figure 6 used to connect the anode of the light-emitting element 30. The cathode of the light-emitting element is electrically connected to the second power supply signal line ELVSS, and this signal line can be disposed in the non-display area, for example. It can be understood that the voltage on the first power supply signal line ELVDD is greater than the voltage on the second power supply signal line ELVSS. Figure 6 、 Figure 7 and Figure 10, optionally, the first control signal line 41 and the fourth control signal line 44 are used to receive the first scan signal Scan1, the second control signal line 42 is used to receive the second scan signal Scan2, and the third control signal line 43 is used to receive the emission control signal EM; the working process of the pixel circuit sequentially includes an initialization stage t1, a data writing stage t2, and an emission stage t3; the first scan signal Scan1 is in an enabled state during the initialization stage t1, and the voltage polarity is positive; the second scan signal Scan2 is in an enabled state during the data writing stage t2, and the voltage polarity is negative; the emission control signal EM is in an enabled state during the emission stage t3, and the voltage polarity is negative.

[0078] Specifically, based on the above principle explanation, refer to Figure 6 , Figure 7 and Figure 10 , during the initialization stage t1, since the first scan signal Scan1 is in an enabled state, therefore, the first control signal line 41 and the fourth control signal line 44 transmit the control signal in the enabled state, the first switch module K1 corresponding to the first control signal line 41 is turned on, and the second switch module K2 corresponding to the fourth control signal line 44 is turned on. Specifically, the first break U1 and the second break U2 in the first metal trace 51 are closed. In this way, on the one hand, the initialization signal on the initialization signal line Vref can be transmitted to the gate g of the driving transistor T through the first switch module K1 to initialize the gate potential of the driving transistor T. At the same time, the initialization signal on the initialization signal line Vref can be transmitted to the anode of the light-emitting element through the second switch module K2 to initialize the anode potential of the light-emitting element.

[0079] Exemplarily, the first part of the second electrode in the first switch module K1 and the first part of the second electrode in the second switch module K2 are both connected to the Vref signal line, and the voltage of the initialization signal on the Vref signal line can generally be -3.3V, that is, the voltage of the first part in the second electrode is -3.3V. Therefore, during the initialization stage when the first switch module K1 and the second switch module K2 need to be turned on, the first scan signal Scan1 needs to have a relatively high positive voltage, for example, it can be greater than or equal to +7V. During the stage when the first switch module K1 and the second switch module K2 need to be turned off, optionally, the voltage difference between the first scan signal Scan1 and the initialization signal voltage is small, for example, -3.3V can be selected.

[0080] In the data writing stage t2, since the second scan signal Scan2 is in the enabled state, the second control signal line 42 transmits the control signal in the enabled state, and the third switch module K3 and the fourth switch module K4 corresponding to the second control signal line 42 are turned on. Specifically, the third break U3 in the second metal trace 52 and the fourth break U4 in the first metal trace 51 are closed. In this way, the data signal on the data signal line Data can be written into the gate of the driving transistor T through the third switch module K3, the driving transistor T, and the fourth switch module K4, and at the same time, the threshold compensation of the driving transistor T is completed.

[0081] Exemplarily, the first part of the second electrode in the third switch module K3 is electrically connected to the data signal line data. The voltage of the data signal is generally between +1 V and +6 V, and the voltage of the first part of the second electrode in the fourth switch module K4 is lower than the voltage of the first part of the second electrode in the third switch module K3 by |Vth| (|Vth| is the threshold voltage of the driving transistor, generally between 1.5 V and 2 V). Therefore, in the data writing stage when the third switch module K3 and the fourth switch module K4 need to be turned on, the second scan signal Scan2 needs to have a lower negative voltage, for example, it can be less than or equal to -9 V. In the stage when the third switch module K3 and the fourth switch module K4 need to be turned off, the voltage difference between the optional second scan signal Scan2 and the data signal is small. For example, the middle value of the data voltage, such as +2.5 V, can be selected.

[0082] In the light emitting stage t3, since the light emitting control signal EM is in the enabled state, the third control signal line 43 transmits the control signal in the enabled state, and the fifth switch module K5 and the sixth switch module K6 corresponding to the third control signal line 43 are turned on. Specifically, the fifth break U5 in the second metal trace 52 and the sixth break U6 in the first metal trace 51 are closed. The driving transistor T generates a driving current and flows into the light emitting element to drive the light emitting element to emit light.

[0083] Exemplarily, the first part of the second electrode in the fifth switch module K5 is electrically connected to the first power supply signal line ELVDD. The voltage of the ELVDD signal is generally +3 V or +4.8 V. The voltage of the first part of the second electrode in the sixth switch module K6 is slightly lower than the voltage of the first part of the second electrode in the fifth switch module K5. Therefore, in the light emitting stage when the fifth switch module K5 and the sixth switch module K6 need to be turned on, the light emitting control signal EM needs to have a lower negative voltage, for example, it can be less than or equal to -7 V). In the stage when the fifth switch module K5 and the sixth switch module K6 need to be turned off, the light emitting control signal EM can be selected to have a voltage value slightly lower than ELVDD, such as +2 V or +2.5 V.

[0084] In summary, taking the specific pixel circuit as an example, the above embodiments have described in detail its working principle and layout design. Next, a further supplementary description of the structure of the display panel will be given.

[0085] Referring to Figure 9 , optionally, the display panel further includes a buffer layer 6. The first electrode 21 is located on the side of the buffer layer 6 away from the substrate 10. The driving transistor T includes an active layer (poly), and the active layer (poly) is in contact with the buffer layer 6. By providing the buffer layer 6 and making the active layer (poly) in contact with the buffer layer 6, it is beneficial to improve the quality of the buffer layer 6 and ensure the performance of the driving transistor.

[0086] Figure 11 is another cross-sectional structure schematic diagram taken along CC’ in Figure 7 . As shown in Figure 11 , when the first electrode 21 is located on the side of the buffer layer 6 away from the substrate 10, optionally, the display panel further includes a photo-deformable structure 7. The buffer layer 6 has a first groove 61, and the photo-deformable structure 7 is located in the first groove 61; the buffer layer 6 includes a first surface (top surface) in contact with the active layer (poly), and the photo-deformable structure 7 includes an opposite second surface (top surface) and a third surface (bottom surface). The second surface is located on the side of the third surface away from the substrate 10, and the second surface is flush with the first surface; when the dielectric elastomer part 23 is in the initial state, along the first direction D1, the photo-deformable structure 7 overlaps with the region where the first gap h is located, and does not overlap with both the first part 221 and the second part 222.

[0087] Among them, the photo-deformable structure 7 has the property of deforming under illumination of a specific wavelength and returning to the initial state in the absence of illumination, and is used for the formation of the first gap h.

[0088] Specifically, referring to Figure 11 , the display panel further includes a planarization layer 8. The planarization layer 8 is in contact with the first part 221; when the dielectric elastomer part 23 is in the initial state, a micro-cavity R is formed between the planarization layer 8, the side walls of the first part 221, and the side walls and extension surfaces of the second part 222, so that there is a first gap h between the first part 221 and the second part 222.

[0089] The material for forming the planarization layer is usually an organic substance. By providing the photo-deformable structure 7, during the process of preparing the planarization layer 8, the photo-deformable structure 7 can be irradiated with light of a specific wavelength, causing it to bulge upward and expand the first groove 61. In this way, the raised photo-deformable structure 7 can support the material for forming the planarization layer 8 in the region where the microcavity is located, preventing the material for forming the planarization layer 8 from filling the gap between the first branch 221 and the second branch 222 and their extension lines. After the planarization layer 8 is prepared, the light irradiation can be turned off, causing the photo-deformable structure 7 to return to its original state, forming the microcavity R and creating a first gap between the first branch 221 and the second branch 222.

[0090] Exemplarily, the optional photo-deformable structure is an azobenzene-based polymer, and such materials are sensitive to ultraviolet light.

[0091] It should be noted that Figure 11 Only taking the example that the width of the photo-deformable structure 7 along the second direction D2 is equal to the width of the first gap h along the second direction D2 for illustration. In other embodiments, the width of the photo-deformable structure 7 along the second direction D2 can be slightly smaller than the width of the first gap h along the second direction D2, as long as it is ensured that the photo-deformable structure 7 is within the projection range of the first gap h and does not overlap with both the first branch 221 and the second branch 222.

[0092] It should also be noted that when the layer under the first electrode 21 is other layers rather than the buffer layer 6, grooves can be provided in the corresponding layer to accommodate the photo-deformable structure 7, and the embodiments of the present invention are not limited thereto.

[0093] Figure 12 is another schematic cross-sectional structure taken along Figure 7 CC' in the middle, as Figure 12 shown. Optionally, the display panel further includes a first auxiliary extension layer 91, and the first auxiliary extension layer 91 is located on the side of the first electrode 21 close to the substrate 10 and is in contact with at least the first electrode 21, the dielectric elastomer part 23, and the first branch 221 simultaneously.

[0094] Among them, the first auxiliary extension layer 91 plays a role of extension and buffering. By providing the first auxiliary extension layer 91 on the side of the first electrode 21 close to the substrate 10 and making the first electrode 21 in contact with the first auxiliary extension layer 91, it is possible to prevent the first electrode 21 from directly contacting the underlying layer and causing the phenomenon of layer separation (peeling). In addition, by providing the first auxiliary extension layer 91 in contact with the dielectric elastomer part 23 and the first branch 221, the extension and buffering effect of the first auxiliary extension layer 91 can be utilized to improve the ductility of the dielectric elastomer part 23 during the deformation process, ensure the contact between the first branch 221 and the second branch 222, and ensure the quality of the display panel and the reliability of the switching module.

[0095] Exemplarily, the material of the first auxiliary layer 91 may be an organic material, such as PI. In addition, the planarization layer 8 is also formed of an organic material. By arranging the planarization layer 8 in contact with the first branch 221, the planarization layer 8 can also play a role in extending the buffer, improving the ductility of the first branch 221, and facilitating the contact between the first branch 221 and the second branch 222.

[0096] Referring to Figure 12 , when the first electrode 21 is located on the side of the buffer layer 6 away from the substrate 10, optionally, the buffer layer 6 has a second groove 62, and the first auxiliary extension layer 91 is located in the second groove 62; the buffer layer 6 includes a first surface (top surface) in contact with the active layer (poly), and the first auxiliary extension layer 91 includes a fourth surface (top surface) in contact with the first electrode 21, and the first surface and the fourth surface are flush. Such an arrangement is beneficial to forming the switching module on a flat film layer, and is also beneficial to reducing the step difference between the first branch 221 and the second branch 222. While ensuring that there is a gap between the first branch 221 and the second branch 222 in the horizontal direction, the height of the microcavity R along the first direction D1 is reduced, thereby reducing the manufacturing difficulty.

[0097] It should be noted that when the film layer under the first electrode 21 is other film layers rather than the buffer layer 6, grooves can be provided in the corresponding film layers for accommodating the first auxiliary extension layer 91, and the embodiments of the present invention do not limit this.

[0098] It should also be noted that Figure 12 Only taking the example that the first groove 61 and the second groove 62 are not connected to each other for illustration, in other embodiments, the first groove 61 and the second groove 62 may also be connected, and the embodiments of the present invention do not limit this.

[0099] Figure 13 is another cross-sectional structure schematic diagram taken along CC' in Figure 7 , as Figure 13 shown, in other embodiments, the buffer layer 6 may only include the second groove 62, and the first auxiliary extension layer 91 is arranged in the second groove 62, and the first auxiliary extension layer 91 is in contact with the first electrode 21, the dielectric elastomer part 23, and the first branch 221 at the same time. Such an arrangement can increase the coverage area of the first auxiliary extension layer 91, and the first auxiliary extension layer 91 exists on the path where the dielectric elastomer part 23 deforms, which is beneficial to further improving the reliability of the switching module.

[0100] In this embodiment, since the gap between the first branch 221 and the second branch 222 overlaps with the projection of the first auxiliary extension layer 91, when the planarization layer 8 is prepared, the forming material of the planarization layer 8 will fill this gap. However, a tiny gap between the first branch 221 and the second branch 222 can ensure the turn-off of the switching module K. Therefore, the laser treatment method can be adopted to remove the redundant planarization layer between the sidewall of the first branch 221 and the sidewall of the second branch 222 and its extended surface, forming a microcavity to form a gap between the first branch 221 and the second branch 222.

[0101] Referring to Figure 7 、 Figure 8 and the above description, optionally, a part of the control signal line 4 is multiplexed as the first electrode 21.

[0102] Specifically, one control signal line 4 can correspond to at least one switching module K. When different switching modules K are electrically connected to the same control signal line 4, different parts of the control signal line 4 can be multiplexed as the first electrodes 21 of different switching modules K. Such a design can reduce the structural complexity of the pixel circuit, improve the compactness of the pixel circuit, and is beneficial to reducing the layout area of the pixel circuit.

[0103] Referring to Figure 7 、 Figure 8 and the above description, optionally, the display panel further includes connection traces (such as the first metal trace 51 and the second metal trace 52), and the second electrode 22 is disposed on the same layer as the connection traces and integrally formed.

[0104] Among them, the connection traces include the traces connected to the first branch 221 of the second electrode 22 and the traces connected to the second branch 222 of the second electrode 22. By setting the second electrode 22 and the connection traces connected thereto on the same layer and integrally formed, the structural complexity of the pixel circuit can also be reduced, the compactness of the pixel circuit can be improved, and it is beneficial to reducing the layout area of the pixel circuit.

[0105] Continuing to refer to Figure 8 , optionally, in the second electrode 22, the positive projections of the first branch 221 and the second branch 222 on the substrate are both linear; the first branch 221 overlaps with the control signal line 4 in the first direction D1 in projection, and the second branch 222 does not overlap with the control signal line 4 in the first direction D1 in projection. Specifically, the part of the control signal line 4 that overlaps with the projection of the dielectric elastomer part 23 is the first electrode 21. In this embodiment, both the first branch 221 and the second branch 222 are set to be linear, and the second direction D2 is parallel to the extension direction of the straight line. This design has a simple trace pattern and is beneficial to reducing the manufacturing difficulty.

[0106] The top-down shape of the first branch 221 and the second branch 222 is not limited to this. Exemplarily, Figure 14 is a schematic diagram of the film layer structure of another switch module provided by an embodiment of the present invention in an initial state. As Figure 14 shown, optionally, in the second electrode 22, the orthographic projection of the first branch 221 on the substrate 10 is linear, and the orthographic projection of the second branch 222 on the substrate 10 is n-shaped; the second branch 222 includes a first sub-branch 2221, a second sub-branch 2222, and a third sub-branch 2223 located between the first sub-branch 2221 and the second sub-branch 2222; along the extending direction of the control signal line 4, the first sub-branch 2221 and the second sub-branch 2222 are disposed on opposite sides of the first branch 221, and the first branch 221, the first sub-branch 2221, and the second sub-branch 2222 all overlap with the control signal line 4 in the projection along the first direction D1; the third sub-branch 2223 does not overlap with the control signal line 4 in the projection along the first direction D1.

[0107] Specifically, in this embodiment, the direction of the first branch 221 pointing to the second branch 222, that is, the second direction D2, generally refers to any direction parallel to the plane where the substrate 10 is located. For example Figure 14 the X direction and the Y direction shown. As Figure 14 shown, the projection range of the dielectric elastomer part 23 on the substrate 10 along the second direction D2 is larger than the projection range of the first electrode 21 on the substrate 10 along the second direction D2, and the projection range of the first branch 221 on the substrate 10 along the second direction D2 is larger than the projection range of the dielectric elastomer part 23 on the substrate 10 along the second direction D2.

[0108] Figure 15 is a schematic diagram of the film layer structure of another switch module provided by an embodiment of the present invention in a first state. Combining Figure 14 and Figure 15 it can be seen that since the first branch 221 is linear and the second branch 222 is n-shaped, the first gap between the first branch 221 and the second branch 222 is n-shaped. Thus, when the dielectric elastomer part 23 expands along the second direction D2 (such as the X direction and the Y direction) under the electric field action of the first electrode 21 and the first branch 221, the first branch 21 can extend along the second direction D2 (such as the X direction and the Y direction) accordingly. Therefore, when the first branch 221 and the second branch 222 come into contact, the contact area between the two can be significantly increased, which is beneficial to reducing the switching resistance of the switch module.

[0109] Furthermore, referring to Figure 14 and Figure 15, when a part of the control signal line 4 is multiplexed as the first electrode 21 and the second sub-portion 222 is of n-type, the first sub-portion 221 and the dielectric elastomer portion 23 have an extending path along the X direction. Since the projection range of the first sub-portion 221 in the X direction is larger than the extending range of the dielectric elastomer portion 23 in the X direction, there is a risk of short circuit between the first sub-portion 221 and the control signal line 4. To avoid this problem and ensure the normal operation of the switch module, the following two solutions can be adopted.

[0110] As a feasible implementation manner, Figure 16 is Figure 14 a schematic cross-sectional structure diagram taken along LL' in Figure 14 and Figure 16 shown, optionally, the control signal line 4 includes a first trace sub-portion 401, a second trace sub-portion 402, and a third trace sub-portion 403 located between the first trace sub-portion 401 and the second trace sub-portion 402; the third trace sub-portion 403 is adjacent to the first trace sub-portion 401 and the second trace sub-portion 402 respectively; when the dielectric elastomer portion 23 is in the initial state, the third trace sub-portion 403 is in contact with the dielectric elastomer portion 23, and the third trace sub-portion 403 is not in contact with the first sub-portion 221. At least part of the first trace sub-portion 401 and at least part of the second trace sub-portion 402 are not in contact with the dielectric elastomer portion 23. The overlapping region between the first sub-sub-portion 2221 and the control signal line 4 is located within the region where the first trace sub-portion 401 is located, and the overlapping region between the second sub-sub-portion 2222 and the control signal line 4 is located within the region where the second trace sub-portion 402 is located; the control signal line 4 includes a fifth surface F5 and a sixth surface F6, and the fifth surface F5 is located on the side of the sixth surface F6 away from the substrate 10; an oxide layer (schematically shown in bold) is formed on the fifth surface F5 at the regions where the first trace sub-portion 401 and the second trace sub-portion 402 are located.

[0111] Among them, for the above-mentioned at least part of the first trace sub-portion 401 and at least part of the second trace sub-portion 402 that are not in contact with the dielectric elastomer portion 23, for the first trace sub-portion 401, specifically, the entire first trace sub-portion 401 may be completely not in contact with the dielectric elastomer portion 23 (such as Figure 16 ), or a part of the first trace sub-portion 401 may be in contact with the dielectric elastomer portion 23 and another part of the first trace sub-portion 401 may not be in contact with the dielectric elastomer portion 23. Refer to Figure 17 the other schematic cross-sectional structure diagram taken along LL' in Figure 14 shown. Similarly, for the second trace sub-portion 402, specifically, the entire second trace sub-portion 402 may be completely not in contact with the dielectric elastomer portion 23 (such as Figure 16), or alternatively, a part of the second wiring section 402 may be in contact with the dielectric elastomer section 23, and another part of the second wiring section 402 may not be in contact with the dielectric elastomer section 23. The positional relationship between the first wiring section 401 and the second wiring section 402 with respect to the dielectric elastomer section 23 may be the same or different, and the embodiments of the present invention do not limit this.

[0112] Referring to Figure 16 and Figure 17 , in this embodiment, an oxide layer is formed on the upper surface of the control signal line 4 in the regions where the first wiring section 401 and the second wiring section 402 are located. Therefore, the upper surface of the control signal line 4 in this region is an insulating surface. Although the first section 221, the first sub-section 2221, and the second sub-section 2222 are in contact with the control signal line 4 in this region, it can still ensure insulation between the two and avoid short circuits. The third wiring section 403 of the control signal line 4 is in contact with the dielectric elastomer section 23 and not in contact with the first section 221. Therefore, at least part of the third wiring 403 can be reused as the first electrode 21 to ensure the normal operation of the switching module.

[0113] Exemplarily, the oxide layer on the upper surface of the control signal line 4 can be formed by means of surface treatment, which can ensure the flatness of the control signal line 4 and avoid affecting the deformation of the dielectric elastomer section 23.

[0114] Exemplarily, the formation of the gap between the first section 221 and the first sub-section 2221 and the second sub-section 2222 can be set with reference to the above description. For example, after forming the planarization layer, the sidewalls of the first section 221 and the sidewalls of the second section 222 and their extended surfaces can be removed by laser treatment to form a gap.

[0115] As another feasible implementation manner, Figure 18 is another cross-sectional structure schematic diagram taken along Figure 14 LL' in Figure 18As shown, optionally, the control signal line 4 includes a main body portion 404 and a protruding portion 405, and the protruding portion 404 is located on a side of the main body portion 405 away from the substrate 10; the display panel further includes a first insulating layer 901, and the first insulating layer 901 is located on a side of the main body portion 404 away from the substrate 10. The protruding portion 405 includes a seventh surface F7 and an eighth surface F8 (F8 is a virtual surface), the seventh surface F7 is located on a side of the eighth surface F8 away from the substrate 10, the first insulating layer 901 includes a ninth surface F9 and a tenth surface F10, the ninth surface F9 is located on a side of the tenth surface F10 away from the substrate 10, and the seventh surface F7 and the ninth surface F9 are flush; the dielectric elastomer portion 23 is located on a side of the protruding portion 405 away from the substrate 10 and is in contact with both the protruding portion 405 and the first insulating layer 901 at the same time; the first sub-portion 221, the first sub-sub-portion 2221, and the second sub-sub-portion 2222 are all in contact with the first insulating layer 901.

[0116] Specifically, in this embodiment, by improving the structure of the control signal line 4 to have a main body portion 404 and a protruding portion 405, and filling the step difference between the protruding portion 405 and the main body portion 404 with the first insulating layer 901 to make the upper surfaces of the protruding portion 405 and the first insulating layer 901 flush, and arranging the dielectric elastomer portion 23 to be in contact with both the protruding portion 405 and the first insulating layer 901 at the same time, and arranging the first sub-portion 221, the first sub-sub-portion 2221, and the second sub-sub-portion 2222 to be all in contact with the first insulating layer 901, it can not only ensure the insulation between the first sub-portion 221, the first sub-sub-portion 2221, and the second sub-sub-portion 2222 and the control signal line 4 to ensure the normal operation of the switching module, but also enable the deformation movement of the dielectric elastomer portion in the X direction to be carried out on a flat film layer without affecting the deformation movement of the dielectric elastomer portion 23.

[0117] Continue to refer to Figure 18 , optionally, the first insulating layer 901 includes a second auxiliary extension layer 92, and at least the first sub-portion 221 is in contact with the second auxiliary extension layer 92; the material of the second auxiliary extension layer 92 is an organic material.

[0118] Exemplarily, Figure 18 taking the case where the entire first insulating layer 901 is the second auxiliary extension layer 92, that is, all are formed of an organic material, as an example for illustration. In other embodiments, referring to Figure 19 the other cross-sectional structure schematic diagram taken along Figure 14 LL' in

[0119] In this embodiment, by providing that the first insulating layer 901 includes a second auxiliary extension layer 92 formed of an organic material, the extension buffering effect of the second auxiliary extension layer 92 can be utilized to improve the ductility of the dielectric elastomer part 23 during the deformation process, ensure that the first sub-part 221 is in contact with the first sub-sub-part 221 and the second sub-sub-part 222, and ensure the quality of the display panel and the reliability of the switching module.

[0120] Exemplarily, the formation of the gap between the first sub-part 221 and the first sub-sub-part 2221 and the second sub-sub-part 2222 can be set with reference to the above description. For example, after forming the planarization layer, the excess planarization layer between the sidewall of the first sub-part 221 and the sidewall of the second sub-part 222 and its extension surface can be removed by laser treatment to form a gap. Alternatively, a groove can be provided in the area of the first insulating layer 901 corresponding to the gap to accommodate the photo-induced deformation structure, and the photo-induced deformation structure can be used to assist in forming the gap between the first sub-part 221 and the first sub-sub-part 2221 and the second sub-sub-part 2222.

[0121] Based on the same inventive concept, an embodiment of the present invention further provides a method for manufacturing a display panel for manufacturing the display panel provided in any embodiment of the present invention. Figure 20 is a schematic flow chart of a method for manufacturing a display panel provided in an embodiment of the present invention, as Figure 20 shown, the manufacturing method includes:

[0122] S101. Provide a substrate.

[0123] S102. Form a driving circuit layer on one side of the substrate; the driving circuit layer includes a pixel circuit, the pixel circuit includes a driving transistor and at least one switching module, and the switching module is coupled to the driving transistor; along a first direction, the switching module includes a first electrode, a second electrode, and a dielectric elastomer part located between the first electrode and the second electrode, the second electrode is located on the side of the first electrode away from the substrate and is insulated from the first electrode; the first direction is perpendicular to the plane of the substrate; the second electrode includes a first sub-part and a second sub-part arranged in the same layer; the first electrode, the dielectric elastomer part, and the first sub-part overlap in projection along the first direction, and the dielectric elastomer part and the second sub-part do not overlap in projection along the first direction; the projection range of the dielectric elastomer part on the substrate along a second direction is greater than the projection range of the first electrode on the substrate along the second direction, and the projection range of the first sub-part on the substrate along the second direction is greater than the projection range of the dielectric elastomer part on the substrate along the second direction; the second direction is the direction from the first sub-part to the second sub-part and is parallel to the plane of the substrate; the first electrode is electrically connected to a control signal line.

[0124] Among them, the control signal line is used to transmit control signals; when the control signal is in a non-enabled state, the dielectric elastomer part is in an initial state, there is a first gap between the first part and the second part, and the second part is in a suspended state; when the control signal is in an enabled state, the dielectric elastomer part is in a first state, the first part is in contact with the second part, and the first part and the second part are at the same potential.

[0125] Based on the above explanation, in the display panel prepared by the above preparation method, the switching device in the pixel circuit can achieve physical turn-off when turned off, eliminating the possibility of leakage current, thereby solving various problems caused by the leakage current of the switching device and improving the quality of the display panel.

[0126] Next, taking Figure 11 the structure of the display panel shown as an example, the preparation process of the driving circuit layer will be described in detail. Exemplarily, Figures 21 - 30 is Figure 11 a schematic diagram of the preparation process of a display panel corresponding to, as Figures 21 - 30 shown, optionally, a driving circuit layer is formed on one side of the substrate, including the following steps:

[0127] (1) As Figure 21 shown, a buffer layer 6 is formed on one side of the substrate 10, and a first groove 61 is formed in the buffer layer 6.

[0128] Exemplarily, the buffer layer 6 can be a double-layer structure, the bottom layer material is SiN x , and the top layer material is SiO x . The depth of the first groove 61 is less than the thickness of the buffer layer 6.

[0129] (2) As Figure 22 shown, a photo-induced deformation structure 7 is formed in the first groove 61.

[0130] Optionally, photo-induced deformation particles and an elastic substrate can be mixed to disperse the photo-induced deformation particles in the elastic substrate to form a precursor solution, and then the precursor solution can be fabricated in the first groove by an inkjet printing process and then a thermal curing process is performed to form a photo-induced deformation structure.

[0131] In addition, referring to Figure 12 , in other embodiments, after the photo-induced deformation structure 7 is formed, a second groove 62 can be formed in the buffer layer 6, and a first auxiliary extension layer 91 can be formed in the second groove 62. The first auxiliary extension layer 91 can be fabricated in the second groove 62 by a coating process.

[0132] (3) As Figure 23 shown, a first metal layer M1 is formed on the side of the buffer layer 6 away from the substrate 10, and a first patterning process is performed on the first metal layer M1 to obtain a first electrode 21.

[0133] Exemplarily, the first patterning process may employ photolithography and dry / wet etching processes.

[0134] (4) As Figure 24 shown, a transition layer 3 is formed on a side of the buffer layer 6 away from the substrate 10, and a second patterning process is performed on the transition layer 3 to form a first opening 301; the first opening 301 exposes the first electrode 21; the height of the transition layer 3 is greater than the height of the first electrode 21.

[0135] Exemplarily, the material of the transition layer 3 may be SiN x , and the second patterning process may employ photolithography and dry / wet etching processes.

[0136] (5) As Figure 25 shown, a dielectric elastomer part 23 is formed in the first opening 301, and the transition layer 3 is removed.

[0137] Optionally, a fully mixed composite latex may be prepared from a partially reduced graphene oxide-polystyrene-b-poly(n-butyl acrylate)-b-polystyrene triblock copolymer. The composite latex is fabricated in the first opening 301 by an inkjet printing process, and the moisture is evaporated at 20 - 50 °C, and then dried and cooled at 60 °C - 100 °C and -0.1 MPa - -0.01 MPa to obtain the dielectric elastomer part 23.

[0138] Exemplarily, the transition layer may be removed by a dry etching process.

[0139] (6) As Figure 26 shown, a second metal layer M2 is formed on a side of the dielectric elastomer part 23 away from the substrate 10, and a third patterning process is performed on the second metal layer M2 to obtain a second electrode 22.

[0140] Exemplarily, the third patterning process may employ photolithography and dry / wet etching processes. Referring to Figure 7 , a first metal trace 51 and a second metal trace 52 are formed in the second metal layer M2 after the third patterning process, and a part of the first metal trace 51 and the second metal trace 52 serves as the second electrode in the switching module.

[0141] (7) As Figure 27 shown, device structures such as driving transistors and storage capacitors and signal line structures such as a first power signal line ELVDD are formed on the second metal layer M2, adjacent metal layers are separated by a dielectric layer, and metal layers of different layers are electrically connected by means of via holes.

[0142] (8) As Figure 28As shown, light is applied to the photo-deformable structure 7 so that the photo-deformable structure 7 extends in a direction away from the substrate 10.

[0143] The elastic substrate of the photo-deformable structure can be transparent and has elastic recovery performance. The photo-deformable particles in the photo-deformable structure are sensitive to light of a specific wavelength (such as ultraviolet light). When the photo-deformable structure is irradiated with light of a specific wavelength, the photo-deformable structure deforms, protrudes from the first groove 61, and expands in the gap between the first branch 221 and the second branch 222 and their extension planes. Exemplarily, the photo-deformable particles can be, for example, azobenzene-based polymers.

[0144] (9) As Figure 29 As shown, while maintaining the light irradiation, a planarization layer 8 is formed on the side of the second metal layer M2 away from the substrate 10; the planarization layer 8 is in contact with the first branch 221 of the second electrode 22.

[0145] By maintaining the light irradiation, the formation material of the planarization layer 8 can be supported by the photo-deformable structure 7 until the planarization layer 8 is formed.

[0146] (10) As Figure 30 As shown, the light irradiation is turned off so that the photo-deformable structure 7 retracts into the first groove 61, and a micro-cavity R is formed between the planarization layer 8, the side walls of the first branch 221, and the side walls of the second branch 222 and their extension planes.

[0147] After the light irradiation is turned off, the photo-deformable structure 7 returns to its original state, thereby forming a micro-cavity and creating a gap between the first branch 221 and the second branch 222.

[0148] The method for forming the micro-cavity in the above driving circuit layer is not unique. Instead of using a photo-deformable structure, after the planarization layer is formed, the excess planarization layer between the side walls of the first branch 221 and the side walls of the second branch 222 and their extension planes can be removed by laser treatment to form a micro-cavity.

[0149] Based on the same inventive concept, an embodiment of the present invention further provides a display device. Exemplarily, Figure 31 is a schematic structural diagram of a display device provided by an embodiment of the present invention. As Figure 31 shown, the display device 200 includes the display panel 100 provided in any of the above embodiments, and thus has the same beneficial effects as the above display panel. The same parts can be referred to the description of the above embodiments and will not be repeated here. The display device 200 can be an LED display device. In addition, the display device 200 provided by the embodiment of the present invention can be Figure 31The mobile phone shown can also be any electronic product with a display function, including but not limited to the following categories: televisions, laptop computers, desktop monitors, tablet computers, digital cameras, smart bracelets, smart glasses, in-vehicle displays, medical devices, industrial control devices, touch interaction terminals, etc. The embodiments of the present invention do not make special limitations on this.

[0150] The above specific implementation manners do not constitute a limitation on the protection scope of the present invention. Those skilled in the art should understand that various modifications, combinations, sub-combinations and substitutions can be made according to design requirements and other factors. Any modifications, equivalent substitutions and improvements made within the spirit and principle of the present invention shall be included within the protection scope of the present invention.

Claims

1. A display panel, characterized in that: include: Substrate, A driving circuit layer, located on one side of the substrate; the driving circuit layer includes a pixel circuit, the pixel circuit includes a driving transistor and at least one switch module, and the switch module is coupled to the driving transistor; Along a first direction, the switch module includes a first electrode, a second electrode, and a dielectric elastic portion located between the first electrode and the second electrode, the second electrode is located on a side of the first electrode away from the substrate and is insulated from the first electrode; the first direction is perpendicular to the plane where the substrate is located; The second electrode comprises a first subsection and a second subsection arranged in the same layer; the first electrode, the dielectric elastic portion and the first subsection overlap in projection along the first direction, and the dielectric elastic portion and the second subsection do not overlap in projection along the first direction; the projection range of the dielectric elastic portion on the substrate along the second direction is greater than the projection range of the first electrode on the substrate along the second direction, and the projection range of the first subsection on the substrate along the second direction is greater than the projection range of the dielectric elastic portion on the substrate along the second direction; the second direction is the direction from the first subsection to the second subsection, and is parallel to the plane where the substrate is located; The first electrode is electrically connected to a control signal line, and the control signal line is used to transmit a control signal; when the control signal is in a non-enabled state, the dielectric elastic portion is in an initial state, a first gap is provided between the first branch and the second branch, and the second branch is in a suspended state; when the control signal is in an enabled state, the dielectric elastic portion is in a first state, the first branch is in contact with the second branch, and the first branch and the second branch are at the same potential.

2. The display panel according to claim 1, characterized in that: Along the first direction, a projection range of the dielectric elastic portion in the first state is greater than a projection range of the dielectric elastic portion in the initial state.

3. The display panel according to claim 1, characterized in that: When the control signal is in a disabled state, |V1-V2|≤Va; When the control signal is in the enabled state, |V1-V2|≥Vb, and the polarities of V1 and V2 are opposite; Wherein, V1 represents the voltage on the first electrode, V2 represents the voltage on the first subsection, Va represents the first voltage threshold, Vb represents the second voltage threshold, and Va<Vb.

4. The display panel according to claim 3, characterized in that: Va≤3V, Vb≥10V.

5. The display panel according to claim 1, characterized in that: The driving transistor includes an active layer, the display panel further includes a buffer layer, the first electrode is located on a side of the buffer layer away from the substrate, and the active layer contacts the buffer layer.

6. The display panel according to claim 5, characterized in that: The display panel further includes a photo-induced deformation structure, the buffer layer has a first groove, and the photo-induced deformation structure is located in the first groove; The buffer layer includes a first surface in contact with the active layer, the photodeformable structure includes a second surface and a third surface opposite to each other, the second surface is located on a side of the third surface away from the substrate, and the second surface is flush with the first surface; When the dielectric elastic portion is in the initial state, along the first direction, the photodeformable structure overlaps with the region where the first gap is located, and does not overlap with the first sub-portion and the second sub-portion.

7. The display panel according to claim 5, characterized in that: The display panel further includes a first auxiliary extension layer, which is located on a side of the first electrode close to the substrate and is in contact with at least the first electrode, the dielectric elastic portion and the first sub-portion at the same time.

8. The display panel according to claim 7, characterized in that: The buffer layer has a second groove, and the first auxiliary extension layer is located in the second groove; The buffer layer includes a first surface contacting the active layer, the first auxiliary extension layer includes a fourth surface contacting the first electrode, and the first surface is flush with the fourth surface.

9. The display panel according to claim 1, characterized in that: The display panel further includes a planarization layer, wherein the planarization layer is in contact with the first sub-portion; When the dielectric elastic portion is in the initial state, micro cavities are formed between the planarization layer, the sidewall of the first section, and the sidewall of the second section and an extended surface thereof.

10. The display panel according to claim 1, characterized in that: A portion of the control signal line is multiplexed as the first electrode.

11. The display panel according to claim 10, characterized in that: In the second electrode, the orthographic projections of the first sub-portion and the second sub-portion on the substrate are both straight lines; The first section overlaps with the control signal line when projected along the first direction, and the second section does not overlap with the control signal line when projected along the first direction.

12. The display panel according to claim 10, characterized in that: In the second electrode, the orthographic projection of the first sub-portion on the substrate is a straight line, and the orthographic projection of the second sub-portion on the substrate is an n-shaped; The second division includes a first sub-division, a second sub-division and a third sub-division located between the first sub-division and the second sub-division; along the extension direction of the control signal line, the first sub-division and the second sub-division are arranged on opposite sides of the first division, and the first division, the first sub-division and the second sub-division all overlap with the projection of the control signal line along the first direction; the third sub-division does not overlap with the projection of the control signal line along the first direction.

13. The display panel according to claim 12, characterized in that: The control signal line includes a first routing section, a second routing section, and a third routing section located between the first routing section and the second routing section; the third routing section is adjacent to the first routing section and the second routing section respectively; When the dielectric elastic portion is in the initial state, the third routing section is in contact with the dielectric elastic portion, and the third routing section is not in contact with the first section, and at least part of the first routing section and at least part of the second routing section are not in contact with the dielectric elastic portion; the overlapping area of ​​the first sub-section and the control signal line is located in the area where the first routing section is located, and the overlapping area of ​​the second sub-section and the control signal line is located in the area where the second routing section is located; The control signal line includes a fifth surface and a sixth surface, wherein the fifth surface is located on a side of the sixth surface away from the substrate; an oxide layer is formed on the fifth surface in the area where the first wiring section and the second wiring section are located.

14. The display panel according to claim 12, characterized in that: The control signal line comprises a main body and a protruding portion, wherein the protruding portion is located at a side of the main body away from the substrate; The display panel further includes a first insulating layer, the first insulating layer is located on a side of the main body away from the substrate, the protruding portion includes a seventh surface and an eighth surface, the seventh surface is located on a side of the eighth surface away from the substrate, the first insulating layer includes a ninth surface and a tenth surface, the ninth surface is located on a side of the tenth surface away from the substrate, and the seventh surface is flush with the ninth surface; The dielectric elastic portion is located at a side of the protruding portion away from the substrate, and is in contact with the protruding portion and the first insulating layer at the same time; The first section, the first sub-section, and the second sub-section are all in contact with the first insulating layer.

15. The display panel according to claim 14, characterized in that: The first insulating layer includes a second auxiliary extension layer, and at least the first sub-portion is in contact with the second auxiliary extension layer; The material of the second auxiliary extension layer is an organic material.

16. The display panel according to claim 1, characterized in that: The display panel further includes a connecting wire, and the second electrode and the connecting wire are arranged in the same layer and are integrally formed.

17. The display panel according to claim 1, characterized in that: The driving circuit layer comprises a first metal layer, a dielectric material layer and a second metal layer, wherein the dielectric material layer is located on a side of the first metal layer away from the substrate, and the second metal layer is located on a side of the dielectric material layer away from the substrate; the first electrode is located on the first metal layer, the dielectric elastic part is located on the dielectric material layer, and the second electrode is located on the second metal layer; The driving transistor includes an active layer, and the second metal layer is located on a side of the active layer close to the substrate.

18. The display panel according to claim 17, characterized in that: The first metal layer includes a first control signal line, a second control signal line, a third control signal line and a fourth control signal line which are arranged in sequence side by side; The dielectric material layer includes a first dielectric elastic portion, a second dielectric elastic portion, a third dielectric elastic portion, a fourth dielectric elastic portion, a fifth dielectric elastic portion and a sixth dielectric elastic portion, the first dielectric elastic portion and the first control signal line form a first overlapping region along the first direction, the second dielectric elastic portion and the fourth control signal line form a second overlapping region along the first direction, the third dielectric elastic portion and the second control signal line form a third overlapping region along the first direction, the fourth dielectric elastic portion and the second control signal line form a fourth overlapping region along the first direction, the fifth dielectric elastic portion and the third control signal line form a fifth overlapping region along the first direction, and the sixth dielectric elastic portion and the third control signal line form a sixth overlapping region along the first direction; The second metal layer includes a first metal trace and a second metal trace. Along the first direction, the first metal trace overlaps with the first overlapping region, the second overlapping region, the fourth overlapping region and the sixth overlapping region at the same time, and the second metal trace overlaps with the third overlapping region and the fifth overlapping region at the same time; When the dielectric elastic portion in the dielectric material layer is in the initial state, the first metal routing has a first break and a fourth break located between the first overlapping area and the fourth overlapping area, and a sixth break and a second break located between the sixth overlapping area and the second overlapping area, and the second metal routing has a third break and a fifth break located between the third overlapping area and the fifth overlapping area.

19. The display panel according to claim 18, characterized in that: The first control signal line and the fourth control signal line are used to receive a first scan signal, the second control signal line is used to receive a second scan signal, and the third control signal line is used to receive a light emitting control signal; The working process of the pixel circuit includes an initialization stage, a data writing stage and a light-emitting stage in sequence; the first scanning signal is in an enabled state in the initialization stage, and the voltage polarity is positive; the second scanning signal is in an enabled state in the data writing stage, and the voltage polarity is negative; the light-emitting control signal is in an enabled state in the light-emitting stage, and the voltage polarity is negative.

20. The display panel according to claim 18, characterized in that: The orthographic projection of the active layer on the substrate is located in a first region; the first region is a region enclosed by the orthographic projections of the second control signal line, the third control signal line, the first metal wiring and the second metal wiring on the substrate; The active layer includes a first end and a second end, the first end is overlapped with the first metal wiring, and the second end is overlapped with the second metal wiring.

21. The display panel according to claim 1, characterized in that: Along a direction from the first section to the second section, a width of the first gap is smaller than a maximum deformation amount of the dielectric elastic portion.

22. The display panel according to claim 1, characterized in that: The material of the dielectric elastic part includes at least one of polyacrylate elastomer, polyurethane elastomer and silicone rubber.

23. A method for preparing a display panel, characterized in that: include: providing a substrate; forming a driving circuit layer on one side of the substrate; The driving circuit layer includes a pixel circuit, and the pixel circuit includes a driving transistor and at least one switch module, and the switch module is coupled to the driving transistor; along a first direction, the switch module includes a first electrode, a second electrode, and a dielectric elastic portion located between the first electrode and the second electrode, and the second electrode is located on a side of the first electrode away from the substrate and is insulated from the first electrode; the first direction is perpendicular to the plane where the substrate is located; the second electrode includes a first subsection and a second subsection arranged in the same layer; the first electrode, the dielectric elastic portion, and the first subsection overlap in projection along the first direction, and the dielectric elastic portion and the second subsection do not overlap in projection along the first direction; the projection range of the dielectric elastic portion on the substrate along the second direction is greater than the projection range of the first electrode on the substrate along the second direction, and the projection range of the first subsection on the substrate along the second direction is greater than the projection range of the dielectric elastic portion on the substrate along the second direction; the second direction is the direction from the first subsection to the second subsection, and is parallel to the plane where the substrate is located; Wherein, the first electrode is electrically connected to a control signal line, and the control signal line is used to transmit a control signal; when the control signal is in a non-enabled state, the dielectric elastic portion is in an initial state, a first gap is provided between the first branch and the second branch, and the second branch is in a suspended state; when the control signal is in an enabled state, the dielectric elastic portion is in a first state, the first branch is in contact with the second branch, and the first branch and the second branch are at the same potential.

24. The preparation method according to claim 23, characterized in that: A driving circuit layer is formed on one side of the substrate, comprising: forming a buffer layer on one side of the substrate; forming a first groove in the buffer layer, and forming a photodeformation structure in the first groove; forming a first metal layer on a side of the buffer layer away from the substrate, and performing a first patterning process on the first metal layer to obtain the first electrode; A transition layer is formed on a side of the buffer layer away from the substrate, and the transition layer is subjected to a second patterning process to form a first opening; the first opening exposes the first electrode; and the height of the transition layer is greater than the height of the first electrode; forming the dielectric elastic portion in the first opening and removing the transition layer; forming a second metal layer on a side of the dielectric elastic portion away from the substrate, and performing a third patterning process on the second metal layer to obtain the second electrode; irradiating the photodeformable structure with light so that the photodeformable structure extends in a direction away from the substrate; Maintaining the light irradiation, forming a planarization layer on a side of the second metal layer away from the substrate; the planarization layer is in contact with the first sub-portion of the second electrode; The light is turned off to shrink the photodeformable structure into the first groove, so that a micro cavity is formed between the planarization layer, the sidewall of the first section, and the sidewall of the second section and an extended surface thereof.

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

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