CN112269486A

CN112269486A - Display panel

Info

Publication number: CN112269486A
Application number: CN202010975964.3A
Authority: CN
Inventors: 张豪峰; 张萌; 陈建平; 单奇
Original assignee: Kunshan Govisionox Optoelectronics Co Ltd
Current assignee: Kunshan Govisionox Optoelectronics Co Ltd
Priority date: 2020-09-16
Filing date: 2020-09-16
Publication date: 2021-01-26
Anticipated expiration: 2040-09-16
Also published as: CN112269486B

Abstract

The application discloses display panel includes: a substrate, a first coil, a first drive circuit, a piezoelectric film, and a second coil; wherein, the first coil is arranged on one side of the substrate; the first driving circuit is electrically connected with the first coil and used for responding to touch operation of the display panel to supply power to the first coil so as to enable the first coil to generate a magnetic field; the piezoelectric film is arranged on one side of the substrate; the second coil is arranged on the piezoelectric film, two ends of the second coil are respectively electrically connected with two sides of the piezoelectric film, and the remaining part of the second coil is insulated from the piezoelectric film and used for inducing a magnetic field to generate a potential difference on two sides of the piezoelectric film so as to deform the piezoelectric film and enable the substrate to vibrate. Through the mode, the touch feedback with low energy consumption can be realized.

Description

Display panel

Technical Field

The present application relates to the field of display, and in particular, to a display panel.

Background

At present, digital devices having a touch screen, such as smart phones, portable game machines, or computers, have penetrated people's daily lives. The virtual keys on the touch screen gradually replace the physical keys of the digital device, so that the digital device is more convenient and efficient to operate. However, the user cannot obtain physical feedback when pressing a physical key while using a virtual key. In order to improve the operation experience when the virtual key is used, the touch feedback of the virtual key is usually realized by adopting modes such as vibration, sound effect and the like.

Additional components are often required to implement touch feedback of the virtual keys in the form of vibrations/sound effects, such as linear motors, linear resonators, deflection motors, or piezoelectric elements. In a long-term research and development process, the inventor of the application finds that the touch feedback mode of the virtual key can greatly increase the power consumption of the terminal equipment.

Disclosure of Invention

The technical problem that this application mainly solved provides a display panel, can realize the touch feedback of low energy consumption.

In order to solve the technical problem, the application adopts a technical scheme that: provided is a display panel including: a substrate, a first coil, a first drive circuit, a piezoelectric film, and a second coil; wherein, the first coil is arranged on one side of the substrate; the first driving circuit is electrically connected with the first coil and used for responding to touch operation of the display panel to supply power to the first coil so as to enable the first coil to generate a magnetic field; the piezoelectric film is arranged on one side of the substrate; the second coil is arranged on the piezoelectric film, two ends of the second coil are respectively electrically connected with two sides of the piezoelectric film, and the remaining part of the second coil is insulated from the piezoelectric film and used for inducing a magnetic field to generate a potential difference on two sides of the piezoelectric film so as to deform the piezoelectric film and enable the substrate to vibrate.

And the number of turns of the second coil is greater than that of the first coil.

Wherein, one side of base plate is provided with the cavity structure, and the cavity structure is used for holding the piezoelectric film.

Wherein, the second coil includes many circle sub-coils, and display panel includes: at least one switching transistor and a second drive circuit; at least one switching transistor is connected between two adjacent turn sub-coils and used for controlling the connection or disconnection of the two adjacent turn sub-coils so as to enable the second coil to be connected or disconnected; the second driving circuit is connected with the switch transistor and used for responding to touch operation on the display panel and controlling the switch transistor of the second coil in the area corresponding to the touch operation to be conducted so as to enable the second coil in the area to be communicated.

Each switch transistor comprises two sub switch transistors, each of which comprises a first sub switch transistor and a second sub switch transistor and is used for controlling the sub coil to be connected with other sub coils at least separated by one adjacent sub coil so as to change the number of turns of the sub coil communicated with the second coil and change the potential difference at two sides of the piezoelectric film; two interfaces of the first sub-switch transistor are respectively a first interface and a second interface, and two interfaces of the second sub-switch transistor are respectively a third interface and a fourth interface; the second coil comprises a first sub-coil, a second sub-coil and a third sub-coil, and each sub-coil is provided with two ends; a first switch transistor is arranged between the first sub-coil and the second sub-coil, and a second switch transistor is arranged between the second sub-coil and the third sub-coil; the first interface and the third interface of the first switching transistor are connected with the first end of the first sub-coil, the second interface is connected with the first end of the second sub-coil, and the fourth interface is connected with the second end of the second sub-coil; the first interface and the third interface of the second switching transistor are both connected with the first end of the second sub-coil, the second interface is connected with the first end of the third sub-coil, and the fourth interface is connected with the second end of the third sub-coil.

The switch transistor is a CMOS (complementary metal oxide semiconductor) transistor and comprises a grid electrode, a PMOS (P-channel metal oxide semiconductor) transistor and an NMOS (N-channel metal oxide semiconductor) transistor; the two sub-switch transistors are respectively a PMOS transistor and an NMOS transistor; the second driving circuit is specifically used for independently controlling each grid voltage so as to enable the PMOS tube to be communicated or the NMOS tube to be communicated, and the number of turns of the sub-coils communicated in the second coil is controlled.

Wherein, the display panel comprises a support leg structure; the support leg structure is used for fixedly connecting the piezoelectric film and the substrate, the connecting part of the piezoelectric film and the support leg structure is rigid, and the switch transistor is arranged on the connecting part.

The piezoelectric film is provided with a first coil and a second coil, wherein the first coil is arranged on the piezoelectric film; the area of the first electrode and the area of the second electrode are not smaller than the area of the piezoelectric film.

The first coil is arranged along the circumferential direction of the substrate; or a plurality of first coils are arranged in the orthographic projection area of the piezoelectric film on the substrate.

The substrate is a stretchable substrate, and the display panel comprises a plurality of pixel units; the pixel units are arranged at one side of the stretchable substrate at intervals; the piezoelectric film is arranged between the adjacent pixel units; the piezoelectric film deforms such that the stretchable substrate contracts or expands.

The beneficial effect of this application is: in contrast to the prior art, the present application provides a display panel including a substrate, a first coil, a first driving circuit, a piezoelectric film, and a second coil. The first driving circuit is electrically connected with the first coil and used for responding to touch operation of the display panel to supply power to the first coil so as to enable the first coil to generate a magnetic field; and the second coil is arranged on the piezoelectric film, two ends of the second coil are respectively electrically connected with two sides of the piezoelectric film, and the rest part of the second coil is insulated from the piezoelectric film and is used for inducing a magnetic field to generate a potential difference on two sides of the piezoelectric film so as to deform the piezoelectric film and enable the substrate to vibrate. The display panel is provided with the piezoelectric film, and when the display panel is touched, the piezoelectric film deforms to cause the display panel to vibrate, so that touch feedback is formed. The electric energy consumed by the deformation of the piezoelectric film is very small, the power consumption of the display panel is not greatly improved when the touch operation feedback is carried out, and the loss of the display panel can be reduced.

In addition, the piezoelectric film realizes wireless power supply through the second coil arranged on the piezoelectric film and the first coil arranged on the substrate, and is not required to be connected with the substrate through an additional lead, so that the factors influencing the self deformation of the piezoelectric film are reduced. The piezoelectric film can be sufficiently deformed so that the display panel can have a good vibration effect.

Drawings

FIG. 1 is a schematic diagram illustrating a top view structure of a display panel according to an embodiment of the present application;

FIG. 2 is a schematic top view of a display panel according to another embodiment of the present application;

FIG. 3 is a schematic diagram of a partial structure of a second coil according to an embodiment of the present application;

FIG. 4 is a schematic diagram of a second coil partial structure according to another embodiment of the present application;

fig. 5 is a partial structure diagram of a second coil according to yet another embodiment of the present application.

Detailed Description

In order to make the purpose, technical solution and effect of the present application clearer and clearer, the present application is further described in detail below with reference to the accompanying drawings and examples.

The problems that a large amount of electric quantity needs to be consumed, the power consumption of terminal equipment is increased and the like in a touch feedback mode of a touch screen virtual key in the prior art are solved. The application provides a display panel, which comprises a substrate, a first coil, a first driving circuit, a piezoelectric film and a second coil, wherein the first driving circuit is electrically connected with the first coil and used for responding to touch operation of the display panel to supply power to the first coil so as to enable the first coil to generate a magnetic field; the second coil is arranged on the piezoelectric film, two ends of the second coil are respectively electrically connected with two sides of the piezoelectric film, and the remaining part of the second coil is insulated from the piezoelectric film and used for inducing a magnetic field to generate a potential difference on two sides of the piezoelectric film so as to deform the piezoelectric film and enable the substrate to vibrate. The piezoelectric film is deformed to drive the substrate to vibrate, and touch feedback is formed when the display panel is touched. The electric quantity consumed by the deformation of the piezoelectric film is extremely small, and the power consumption of the terminal equipment cannot be greatly increased. The flexible display panel disclosed by the application can be used for various display modes, such as OLED display, quantum dot display, Micro-LED display and the like. Here, the OLED display is taken as an example for explanation, but is not limited to this display mode. As described in detail below.

Referring to fig. 1, fig. 1 is a schematic top view of a display panel according to an embodiment of the present application. The display panel 100 includes a substrate 110, a first coil 120, a first driving circuit 130, a piezoelectric film 140, and a second coil 150.

The substrate 110 may be a rigid substrate or a stretchable substrate. The first coil 120 is disposed on one side of the substrate 110. The first coil 120 may be disposed on any side of the substrate 110, which is not limited herein. The first driving circuit 130 is electrically connected to the first coil 120. The first driving circuit 130 is used to supply power to the first coil 120 in response to a touch operation on the display panel to cause the first coil 120 to generate a magnetic field. That is, the first driving circuit 130 may supply power to the first coil 120 when the display panel is touched.

The piezoelectric film 140 is disposed on one side of the substrate 110. The piezoelectric film 140 may be disposed on any side of the substrate 110, which is not limited herein. The piezoelectric film 140 may be disposed on the same side of the substrate 110 as the first coil 120, or may be disposed on a different side of the substrate 110.

The piezoelectric film 140 may refer to a thin film that can be deformed when a voltage is applied thereto. The piezoelectric film 140 may be made of a material having piezoelectricity, or may be made of a thin film material coated with a coating having piezoelectricity. The power consumption of the piezoelectric film 140 is very small, and the power consumption of the display panel is not greatly increased. The piezoelectric film 140 can drive the substrate 110 to vibrate when deformed.

The second coil 150 is disposed on the piezoelectric film 140. The second coil 150 may be disposed on either side of the piezoelectric film 140, or at any position, which is not limited herein. In an embodiment, the second coil 150 may be disposed along a circumferential direction of the piezoelectric film 140. Both ends of the second coil 150 are electrically connected to both sides of the piezoelectric film 140, respectively, and the remaining portion is insulated from the piezoelectric film 140. The second coil 150 is used to induce a magnetic field to generate a potential difference across the piezoelectric film 140, so that the piezoelectric film 140 is deformed to vibrate the substrate 110.

Electrodes are generally disposed on both sides of the piezoelectric film 140 for generating a potential difference to deform the piezoelectric film 140. Both ends of the second coil 150 may be connected to electrodes on both sides of the piezoelectric film 140, respectively, and convert the received electric energy into a potential difference, so that the piezoelectric film 140 is deformed. The remaining portion of the second coil 150 beyond the two ends needs to be insulated from the piezoelectric film 140 to prevent affecting the ability of the second coil 150 to induce a magnetic field. For example, the portion of the second coil 150 other than the two ends may be insulated from the piezoelectric film 140 by providing an insulating layer between the second coil 150 and the piezoelectric film 140. It should be noted that the first coil 120 and the second coil 150 may be made of metal wires, or may be formed by patterning a metal film.

In a specific use, when the display panel is touched, the first driving circuit 130 supplies power to the first coil 120, so that the first coil 120 generates a continuously changing magnetic field, an induced current occurs when the second coil 150 inductively senses the change of the magnetic field, and the induced current in the second coil 150 can cause the electrodes on the two sides of the piezoelectric film 140 to form a potential difference, so that the piezoelectric film 140 deforms. The deformation of the piezoelectric film 140 may cause the substrate 110 to vibrate, thereby achieving that the display panel may vibrate when touched to form touch feedback.

The display panel is provided with the piezoelectric film, and when the display panel is touched, the piezoelectric film deforms to cause the display panel to vibrate, so that touch feedback is formed. The electric energy consumed by the deformation of the piezoelectric film is very small, the power consumption of the display panel is not greatly improved when the touch operation feedback is carried out, and the loss of the display panel can be reduced. Moreover, the piezoelectric film realizes wireless power supply through the second coil arranged on the piezoelectric film and the first coil arranged on the substrate without being connected with the substrate through an additional lead, so that the factors influencing the self deformation of the piezoelectric film are reduced. The piezoelectric film can be sufficiently deformed so that the display panel can have a good vibration effect.

The first coil 120 is used to generate a magnetic field, so that the first coil 120 may be disposed at any position of the display panel, may be disposed on the substrate 110, or may not be disposed on the substrate 110, as long as the first coil 120 is not disposed at the same layer as the second coil 150, and the magnetic field generated by the first coil 120 can be sensed by the second coil 150. The first coil 120 may be one or more. In one embodiment, the first coil 120 is one and is disposed along the circumferential direction of the substrate 110. So that the plurality of second coils 150 can be supplied with power through only one first coil 120. In one embodiment, the first coils 120 are disposed on the orthographic projection area of the piezoelectric film 140 on the substrate 110. That is, one piezoelectric film 140 corresponds to one first coil 120 corresponding to the position thereof. A first coil 120 may power a piezoelectric film 140. Thus, the power supply performance of each piezoelectric film 140 can be independently controlled.

A first electrode and a second electrode are respectively disposed at two sides of the piezoelectric film 140, the first electrode and the second electrode are respectively connected to two ends of the second coil 150, and the first electrode and the second electrode are used for generating a potential difference to deform the piezoelectric film 140. The area of the first electrode and the area of the second electrode are equal. The area of the two electrodes may be equal to or different from the area of the piezoelectric film 140, and the area of the two electrodes may be smaller than the area of the piezoelectric film 140. In one embodiment, neither the area of the first electrode nor the area of the second electrode is smaller than the area of the piezoelectric film 140. Thus, the entire area of the piezoelectric film 140 may receive a voltage, thereby deforming the entire piezoelectric film 140.

The deformation degree of the piezoelectric film 140 is proportional to the received voltage, and the piezoelectric film 140 needs to receive a high voltage to generate a large deformation to vibrate the display panel. In one embodiment, the number of turns of the second coil 150 is greater than the number of turns of the first coil 120. When the number of turns of the second coil 150 is greater than that of the first coil 120, the voltage in the second coil 150 can be higher than that in the first coil 120, so that a larger potential difference can be formed across the piezoelectric film 140, and the deformation of the piezoelectric film 140 can be larger. The voltage is increased by setting the number of turns of the second coil 150 to be higher than that of the first coil 120, and thus, a driving chip having a higher output voltage may not be additionally provided.

Since the piezoelectric film 140 receives a voltage in the wireless power supply mode, it is not necessary to fix the piezoelectric film 140 to the substrate 110, and the deformation capability of the piezoelectric film 140 is not limited by the expansion and contraction performance of the piezoelectric film 140 itself. In one embodiment, one side of the substrate 110 is provided with a cavity structure for accommodating the piezoelectric film 140. Specifically, the cavity structure may be a structure having a cavity formed on the substrate 110 with any suitable material. For example, a cavity structure may be formed on one side of the substrate 110 using PDL. The cavity structure may be a plurality of cavities arrayed on one side of the substrate 110. Generally, one side of the substrate 110 is provided with light emitting elements for display, and the cavity structure may be disposed between the light emitting elements.

Referring to fig. 2, fig. 2 is a schematic top view of a display panel according to another embodiment of the present application. The display panel 200 includes a substrate 210, a first coil 220, a first driving circuit 230, a piezoelectric film 240, and a second coil 250.

In one embodiment, the first coil 220 is one and is disposed along the circumferential direction of the substrate 210. The first coil 220 may simultaneously supply power to the plurality of piezoelectric films 240. In order to be able to control the deformation of the piezoelectric film 240 at different positions, at least one switching transistor may be provided in the second coil 250 for controlling the connection or disconnection of the second coil 250. Specifically, the second coil 250 includes a plurality of turns of sub-coils, and a switching transistor is connected between two adjacent turns of sub-coils for controlling the connection or disconnection of the two adjacent turns of sub-coils to connect or disconnect the second coil 250.

The display panel is further provided with a second driving circuit (not shown) connected to the switching transistors for controlling the switching transistors of the second coils 250 of the touch operation corresponding regions to be turned on in response to a touch operation to the display panel, so that the second coils 250 of the regions are turned on. Specifically, when the display panel is touched, the second driving circuit may provide a predetermined voltage to the switching transistor on the piezoelectric film 240 in the touch operation corresponding region, so that the switching transistor is turned on and the corresponding second coil 250 is turned on, and thus, a magnetic field may be induced to generate electric energy. That is, it is possible to realize that the piezoelectric film 240 of the touch operation corresponding region is deformed so that the substrate 210 of the region is vibrated, forming touch feedback.

Specific structure of the switching transistor referring to fig. 3, fig. 3 is a partial structure diagram of a second coil according to an embodiment of the present application. The second coil 250 includes a plurality of turns of sub-coils, wherein both ends of the second coil 250 are respectively provided with a first electrode contact point 251 and a second electrode contact point 252 for contacting the first electrode and the second electrode on both sides of the piezoelectric film 240. Since there may be one electrode on a different side of the piezoelectric film 240 than the second coil 250, the piezoelectric film 240 may be provided with a through hole at a position corresponding to the first electrode contact 251 or the second electrode contact 252 for connecting the electrode on the other side of the piezoelectric film 240 with the second coil 250.

At least one switching transistor 300 may be disposed between any adjacent two of the sub-coils. The switching transistor includes a gate 310 and a semiconductor source-drain heavily doped region 320. The semiconductor source-drain heavily doped regions 320 may be connected to the head and tail ends of two adjacent sub-coils, respectively. The gate 310 is at the same level as the second coil 250 and the gate 310 crosses the second coil 250 through a metal bridge. The voltage at the gate 250 satisfying the predetermined condition is that the switching transistor 300 is turned on.

The other sub-coils of the second coil 250 may be directly connected to each other, or may be connected to each other by providing a conductive structure 253. The sub-coil and the switching transistor 300 may be connected by a conductive structure 253.

Further, a switching transistor may be provided between a plurality of groups of adjacent sub-coils, and the switching transistor may be provided as a bidirectional switch. Please refer to fig. 4 and 5 for the specific structure.

Each switching transistor 400 includes two sub-switching transistors, including a first sub-switching transistor 410 and a second sub-switching transistor 420, respectively. The switching transistor 400 is used to control the sub-coil to be connected to other sub-coils separated by at least one adjacent sub-coil, so that the number of turns of the sub-coil communicated in the second coil 250 is changed, and the potential difference at both sides of the piezoelectric film 240 is changed. The sub-coil and the switching transistor 400, and different switching transistors 400 may be connected by a conductive structure 253. The conductive structure 253 is connected to the sub-coil or switching transistor 400 via a connection point 254.

The two interfaces of the first sub-switching transistor 410 are respectively a first interface and a second interface, and the two interfaces of the second sub-switching transistor 420 are respectively a third interface and a fourth interface.

The second coil 250 includes a first sub-coil, a second sub-coil and a third sub-coil, each of which is provided with two ends; a first switch transistor is arranged between the first sub-coil and the second sub-coil, and a second switch transistor is arranged between the second sub-coil and the third sub-coil.

And the first interface and the third interface of the first switching transistor are both connected with the first end of the first sub-coil. The second interface is connected with the first end of the second sub-coil, and the fourth interface is connected with the second end of the second sub-coil.

The first interface and the third interface of the second switching transistor are both connected with the first end of the second sub-coil, the second interface is connected with the first end of the third sub-coil, and the fourth interface is connected with the second end of the third sub-coil.

Specifically, a current may flow from the first terminal of the first sub-coil, and when the first sub-switching transistor 410 of the first switching transistor is turned on, the current may directly flow to the first terminal of the second sub-coil and flow to the third sub-coil, so that the second sub-coil is short-circuited. When the second sub-switching transistor 420 of the first switching transistor is turned on, a current flows from the first terminal of the first sub-coil to the second terminal of the second sub-coil, and a current flows from the second terminal to the first terminal of the second sub-coil in the second sub-coil and then flows to the third sub-coil.

The switching transistor 400 further comprises a gate 430 for controlling the first sub-switch to be conductive or the second sub-switch to be conductive.

In an embodiment, the switching transistor 400 may be a CMOS transistor, which includes a PMOS transistor and an NMOS transistor; the two sub-switch transistors are respectively a PMOS transistor and an NMOS transistor. The PMOS transistor and the NMOS transistor can be separated from each other and arranged in parallel, as shown in FIG. 4. The PMOS transistor and the NMOS transistor may also be disposed to cross each other, as shown in fig. 5. Wherein, an isolation layer can be arranged between the PMOS tube and the NMOS tube, and the PMOS tube and the NMOS tube are not conducted with each other.

The second driving circuit is specifically configured to independently control the voltage of each gate 430, such that the PMOS transistor is connected or the NMOS transistor is connected, to control the number of turns of the sub-coil connected in the second coil 250.

Referring to fig. 2, in an embodiment, the display panel further includes a leg structure 260 disposed on one side of the substrate 210 for fixedly connecting the piezoelectric film 240 and the substrate 210. The connection portion between the piezoelectric film 240 and the leg structure 260 is rigid, and the switching transistor is disposed at the connection portion. The switching transistor is generally made of an inorganic material, and is rigid in structure and cannot be deformed. By providing the switching transistor at the connection portion, the switching transistor can be protected from damage when the piezoelectric film 240 is deformed. Meanwhile, the second driving circuit may be connected to the switching transistor through the leg structure 260, thereby controlling the conduction of the switching transistor.

In one embodiment, the substrate 210 may be a stretchable substrate 210.

The display panel includes a plurality of pixel units 270 disposed at a side of the stretchable substrate 210 with an interval therebetween. The piezoelectric film 240 is disposed between the adjacent pixel units 270; the piezoelectric film 240 deforms such that the stretchable substrate 210 contracts or expands. When the stretchable substrate 210 is contracted, the pitch between the pixel units 270 becomes smaller, and the density of the pixel units 270 increases.

A connecting wire 280 is further disposed between the adjacent pixel units 270, and the connecting wire 280 is used for electrically connecting the pixel units 270 and conducting the second driving circuit. The connecting wires 280 are disposed on the substrate 210 in a curved shape, and can relieve tensile stress applied thereto by deformation when the stretchable substrate 210 is deformed.

In one embodiment, the stretchable substrate 210 may be provided with a plurality of functional layers, and the piezoelectric film 240 may be disposed between different functional layers. For example, the piezoelectric film 240 may be disposed between the pixel cell 270 and the stretchable substrate 210. For another example, the piezoelectric film 240 is disposed between the connection wire 280 and the substrate 210. Therefore, when the piezoelectric film 240 deforms, the stretchable substrate 210 can be directly driven to deform, which causes vibration.

In summary, when the display panel is touched, the touch signal is sent to the driving chip (or the touch signal is directly sent to the first driving circuit and the second driving circuit), and the driving chip sends the driving signal to the first driving circuit and the second driving circuit. The first drive circuit powers the first coil so that the first coil can generate a magnetic field. The second driving circuit provides a preset grid voltage for the switch transistor on the piezoelectric film of the touch corresponding area, so that the switch transistor is conducted, the second coil on the piezoelectric film of the area is conducted, and the piezoelectric film can be deformed by the potential difference, so that the substrate vibrates. Therefore, when the display panel is touched, the substrate in the touch corresponding area vibrates to form touch feedback.

Further, when the switching transistor is a bidirectional switch, i.e. comprises two sub-switching transistors. The second drive circuit can control the communication mode of each switch transistor on each piezoelectric film, so that the number of turn-on turns of the second coil in different piezoelectric films can be different, different piezoelectric films can receive different voltages, different deformation can occur, and correspondingly, different regions of the substrate have different vibration amplitudes.

Furthermore, the substrate may be a stretchable substrate, the piezoelectric film may be disposed between the pixel units, and when the piezoelectric film deforms, the substrate may be pulled to contract, so that the distance between the pixel units decreases, and the display brightness of the display panel increases. So that the display panel can visually generate touch feedback at the same time.

The above embodiments are merely examples and are not intended to limit the scope of the present disclosure, and all modifications, equivalents, and flow charts using the contents of the specification and drawings of the present disclosure or those directly or indirectly applied to other related technical fields are intended to be included in the scope of the present disclosure.

Claims

1. A display panel, comprising:

a substrate;

a first coil disposed at one side of the substrate;

a first driving circuit electrically connected to the first coil for supplying power to the first coil in response to a touch operation to the display panel to cause the first coil to generate a magnetic field;

a piezoelectric film disposed on one side of the substrate;

and the second coil is arranged on the piezoelectric film, two ends of the second coil are respectively electrically connected with two sides of the piezoelectric film, and the rest part of the second coil is insulated from the piezoelectric film and is used for inducing the magnetic field to generate a potential difference on two sides of the piezoelectric film so as to deform the piezoelectric film and enable the substrate to vibrate.

2. The display panel according to claim 1, wherein the second coil has a larger number of turns than the first coil.

3. The display panel according to claim 1,

and a cavity structure is arranged on one side of the substrate and used for accommodating the piezoelectric film.

4. The display panel of claim 1, wherein the second coil comprises a multi-turn sub-coil, the display panel comprising:

at least one switching transistor connected between the sub-coils of two adjacent turns and used for controlling the connection or disconnection of the sub-coils of two adjacent turns so as to enable the second coil to be connected or disconnected;

and the second driving circuit is connected with the switch transistor and used for responding to the touch operation of the display panel and controlling the switch transistor of the second coil in the area corresponding to the touch operation to be conducted so as to enable the second coil in the area to be communicated.

5. The display panel according to claim 4,

each switch transistor comprises two sub switch transistors, each of which comprises a first sub switch transistor and a second sub switch transistor and is used for controlling the sub coil to be connected with other sub coils at least separated by one adjacent sub coil so as to change the number of turns of the sub coil communicated with the second coil and change the potential difference at two sides of the piezoelectric film;

two interfaces of the first sub-switch transistor are respectively a first interface and a second interface, and two interfaces of the second sub-switch transistor are respectively a third interface and a fourth interface;

the second coil comprises a first sub-coil, a second sub-coil and a third sub-coil, and each sub-coil is provided with two ends; a first switching transistor is arranged between the first sub-coil and the second sub-coil, and a second switching transistor is arranged between the second sub-coil and the third sub-coil;

the first interface and the third interface of the first switching transistor are both connected with the first end of the first sub-coil, the second interface is connected with the first end of the second sub-coil, and the fourth interface is connected with the second end of the second sub-coil;

6. The display panel according to claim 5,

the switch transistor is a CMOS (complementary metal oxide semiconductor) tube and comprises a grid electrode, a PMOS (P-channel metal oxide semiconductor) tube and an NMOS (N-channel metal oxide semiconductor) tube; the two sub-switch transistors are the PMOS transistor and the NMOS transistor respectively;

the second driving circuit is specifically configured to independently control each gate voltage, so that the PMOS transistor is connected or the NMOS transistor is connected, so as to control the number of turns of the sub-coil connected in the second coil.

7. The display panel according to claim 4, characterized in that the display panel comprises:

a leg structure for fixedly connecting the piezoelectric film and the substrate,

the connection portion of the piezoelectric film and the leg structure is rigid, and the switching transistor is disposed at the connection portion.

8. The display panel according to claim 1, wherein a first electrode and a second electrode are provided on both sides of the piezoelectric film, respectively, and the first electrode and the second electrode are connected to both ends of the second coil, respectively;

neither the area of the first electrode nor the area of the second electrode is smaller than the area of the piezoelectric film.

9. The display panel according to claim 1,

the number of the first coils is one, and the first coils are arranged along the circumferential direction of the substrate; or

The piezoelectric film is arranged on the substrate, and the first coils are multiple and are arranged in the orthographic projection area of the piezoelectric film on the substrate.

10. The display panel of claim 1, wherein the substrate is a stretchable substrate, the display panel comprising:

a plurality of pixel units arranged at one side of the stretchable substrate at intervals;

wherein the piezoelectric film is arranged between adjacent pixel units; the piezoelectric film deforms such that the stretchable substrate contracts or expands.