Display panel and display device

Abstract

The application discloses a display panel and a display device, and relates to the field of noise elimination. The display panel comprises a color film substrate, an electric field generating module and an electrokinetic unit. A black matrix area is formed on the color film substrate, and the black matrix area is provided with a sound absorption cavity. The electric field generating module is arranged in the sound absorption cavity and is used for generating a driving electric field. The electrokinetic unit is arranged in the sound absorption cavity and generates displacement or deformation in response to the driving electric field, so as to form at least one Helmholtz resonator with a neck portion and a cavity portion, thereby changing the acoustic impedance of the display panel through the Helmholtz resonator. The driving electric field generated by the electric field generating module makes the electrokinetic unit generate displacement or deformation, so as to dynamically form a Helmholtz resonator in the sound absorption cavity. In this way, the environmental noise can be absorbed and converted into heat energy for consumption, so that the noise reduction effect can be achieved, the adverse effects of the environmental noise on the audio information emitted by the display device can be reduced, and the purification operation of the screen sound can be realized.

Description

Technical Field

[0001] This application relates to the field of noise reduction technology, and in particular to a display panel and display device. Background Technology

[0002] Currently, various display devices have become the main carriers for people to obtain audiovisual information. However, the user experience of display devices in complex environments faces a prominent challenge: environmental noise can seriously interfere with the sound playback of the screen itself.

[0003] Specifically, when users use display devices in noisy outdoor or public places, various noises in the environment will mix with the original sound waves emitted by the screen after propagating to the screen surface due to the physical properties of sound wave reflection, interference and diffraction. This mixing is not a simple superposition; it will cause the sound transmitted to the human ear to become muddy and unclear. The clarity and recognizability of the main audio information will be greatly reduced, making it difficult for users to clearly hear the sound information output by the display device, thereby reducing the audio-visual immersion and the overall user experience. Summary of the Invention

[0004] The main purpose of this application is to propose a display panel that addresses the technical problem that the sound emitted by current display devices is easily affected by environmental noise, resulting in a significant reduction in the clarity and intelligibility of the main audio information, making it difficult for users to clearly hear the sound information output by the display device.

[0005] To achieve the above objectives, the display panel proposed in this application includes:

[0006] A color filter substrate, wherein a black matrix region is formed on the color filter substrate, and a sound-absorbing cavity is provided in the black matrix region;

[0007] An electric field generating module is disposed within the sound-absorbing cavity; the electric field generating module is used to generate a driving electric field within the sound-absorbing cavity.

[0008] An electro-movable unit is disposed within the sound-absorbing cavity; the electro-movable unit generates displacement or deformation in response to the driving electric field to form at least one Helmholtz resonator having a neck and a cavity, thereby changing the acoustic impedance of the display panel through the Helmholtz resonator; wherein the equivalent hydrodynamic diameter of the neck is smaller than the equivalent hydrodynamic diameter of the cavity.

[0009] In one embodiment, the electro-movable unit includes a plurality of electro-movable particles, and the dielectric constants of the plurality of electro-movable particles have a difference.

[0010] When no driving electric field is generated in the sound-absorbing cavity, a plurality of electro-movable particles are stacked at the bottom of the sound-absorbing cavity; when the driving electric field is generated in the sound-absorbing cavity, a plurality of electro-movable particles are dispersed in the sound-absorbing cavity in response to the driving electric field.

[0011] In one embodiment, the electrokinetic particles are ferrous metal particles.

[0012] In one embodiment, the electro-magnetic movable unit includes a plurality of first magnetic elements and a plurality of second magnetic elements, wherein the plurality of first magnetic elements are stacked, and a second magnetic element is disposed between any two adjacent first magnetic elements;

[0013] When no driving electric field is generated in the sound-absorbing cavity, the magnetism of the first magnetic element is opposite to that of the second magnetic element, and the plurality of first magnetic elements and the plurality of second magnetic elements remain in a stacked state under the magnetic attraction. When the driving electric field is generated in the sound-absorbing cavity, the first magnetic element or the second magnetic element responds to the driving electric field and undergoes magnetic reversal. The plurality of first magnetic elements and the plurality of second magnetic elements move upward under the magnetic repulsion, and a current-passing gap is formed between adjacent first magnetic elements and second magnetic elements.

[0014] In one embodiment, the electro-movable unit includes at least two groups of magnetic components arranged at intervals along a horizontal direction, each group of magnetic components including a plurality of first magnetic components and a plurality of second magnetic components stacked together; the width of each group of magnetic components gradually increases from bottom to top.

[0015] In one embodiment, when the driving electric field is generated in the sound-absorbing cavity, a plurality of the first magnetic elements and a plurality of the second magnetic elements in any of the magnetic element groups are aligned one-to-one with a plurality of the current-passing gaps in the adjacent magnetic element groups.

[0016] In one embodiment, the first magnetic component has an arched structure that is high in the middle and low on both sides, and the second magnetic component has an arched structure that is high in the middle and low on both sides.

[0017] In one embodiment, the electro-actuable unit includes an elastic element and two electromagnetic plates, one end of the elastic element is fixedly disposed, and the other end of the elastic element is connected to at least one of the electromagnetic plates;

[0018] When no driving electric field is generated in the sound-absorbing cavity, the two electromagnetic plates are attached to each other under the elastic force of the elastic member; when the driving electric field is generated in the sound-absorbing cavity, the two electromagnetic plates generate magnetism in response to the driving electric field, and the two electromagnetic plates overcome the elastic force of the elastic member and move away from each other under the action of magnetism, thereby forming a flow channel between the two electromagnetic plates.

[0019] In one embodiment, the electro-actuable unit includes at least two spaced-apart electromagnetic components, each of which includes the elastic element and two electromagnetic plates.

[0020] There is a difference in the magnetoelectric coupling coefficient of the electromagnetic plates in at least two of the electromagnetic components; and / or, there is a difference in the elastic coefficient of the elastic element in at least two of the electromagnetic components.

[0021] In one embodiment, the electric field generating module includes a first electrode and a second electrode disposed opposite to each other.

[0022] This application also proposes a display device, which includes a display panel as described above.

[0023] The display panel proposed in this application has a sound-absorbing cavity set within the black matrix area of ​​the color filter substrate, and an electric field generating module and an electro-actuable unit are set within the sound-absorbing cavity. The driving electric field generated by the electric field generating module can drive the electro-actuable unit to shift or deform within the sound-absorbing cavity, thereby dynamically forming a Helmholtz resonator with a specific dimensional relationship. Based on this solution, the following comprehensive technical effects can be achieved:

[0024] I. By employing an actively constructed Helmholtz resonator, effective absorption of environmental noise and purification of screen sound are achieved. Specifically, the Helmholtz resonator, composed of electro-dynamic units, features a narrow neck and a wide cavity. When the frequency of external environmental noise matches the natural frequency of this Helmholtz resonator, the air column in the neck resonates strongly, generating large-amplitude reciprocating vibrations. During this resonance process, based on the friction and viscosity between air molecules, and between air molecules and the walls of the neck and the inner walls of the cavity, the mechanical energy of the sound waves is efficiently converted into heat energy and dissipated. This physical process directly absorbs and eliminates environmental noise energy in specific frequency bands along the propagation path, thereby significantly reducing the intensity of environmental noise transmitted to the human ear. Based on this solution, interference from environmental noise on the audio information emitted by the screen itself can be reduced, effectively improving the clarity and purity of the audio signal transmitted from the screen to the human ear, ultimately fundamentally improving the user's audiovisual experience in noisy environments.

[0025] Second, it achieves active and reversible electronic control of the acoustic function. Specifically, since the reconstruction of the acoustic structure in this solution relies on the driving electric field to drive the electro-actuated movable unit, the noise reduction function can be controlled to start and stop in a very short time simply by applying or removing an electrical signal to the electric field generating module through an external circuit. Furthermore, the sound absorption frequency can be fine-tuned by adjusting the electrical signal parameters. This direct control method based on electrical signals makes it simple and quick for users to operate the noise reduction function, thus achieving one-button switching of the noise reduction function.

[0026] Third, a high degree of invisibility integration between the acoustic structure and the display panel is achieved. This solution places the sound-absorbing cavity within the black matrix area, which is an inherent non-display area on the display panel and is opaque. By utilizing the physical space and optical shielding characteristics of the black matrix area, the entire sound-absorbing system can be hidden within it. This achieves sound absorption and noise reduction while avoiding occupying the effective pixel light-emitting area on the display panel and preventing an excessive increase in the overall size of the display panel due to the addition of this sound-absorbing system.

[0027] Fourth, it enables high-fidelity and latency-free audio signal processing. Since the noise reduction mechanism of this solution is a purely energy-consuming process, independent of the audio electrical signal processing link of the display device, it avoids the signal processing delay and audio quality algorithm distortion problems caused by digital noise reduction technology, reduces additional power consumption, and ensures the integrity and real-time performance of the original audio signal. Attached Figure Description

[0028] To more clearly illustrate the technical solutions in the embodiments of this application or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on the structures shown in these drawings without creative effort.

[0029] Figure 1 This is a schematic diagram of the overall structure of an embodiment of the display panel provided in this application;

[0030] Figure 2 This is a schematic diagram of the closed state of the first specific implementation of the electro-mechanical movable unit in this application to achieve dynamic reconstruction of the acoustic structure;

[0031] Figure 3 This is a schematic diagram of the open state of the first specific implementation of the electro-mechanical movable unit for dynamic reconfiguration of acoustic structure in this application;

[0032] Figure 4 This is a schematic diagram of the closed state of the second specific implementation of the electro-mechanical movable unit for dynamic reconfiguration of acoustic structure in this application;

[0033] Figure 5 This is a schematic diagram of the open state of the second specific implementation of the electro-mechanical movable unit for dynamic reconfiguration of acoustic structure in this application;

[0034] Figure 6 This is a schematic diagram of the closed state of the third specific implementation of the electro-mechanical movable unit for dynamic reconfiguration of acoustic structure in this application;

[0035] Figure 7 This is a schematic diagram of the open state of the third specific implementation method of the electro-mechanical movable unit for dynamic reconstruction of acoustic structure in this application.

[0036] Explanation of icon numbers:

[0037] 1. Color film substrate;

[0038] 2. Black matrix area; 21. Sound-absorbing cavity;

[0039] 3. Electric field generating module; 31. First electrode; 32. Second electrode;

[0040] 4. Electro-movable unit; 41. Electro-movable particle; 42. Magnetic component assembly; 43. Electromagnetic component; 421. First magnetic component; 422. Second magnetic component; 423. Current-passing gap; 431. Elastic component; 432. Electromagnetic plate; 433. Current-passing channel.

[0041] The realization of the purpose, functional features and advantages of this application will be further explained in conjunction with the embodiments and with reference to the accompanying drawings. Detailed Implementation

[0042] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of this application, and not all of the embodiments. Based on the embodiments of this application, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of this application.

[0043] It should be noted that if the embodiments of this application involve directional indicators (such as up, down, left, right, front, back, etc.), the directional indicators are only used to explain the relative positional relationship and movement of the components in a specific posture. If the specific posture changes, the directional indicators will also change accordingly.

[0044] Furthermore, if the embodiments of this application involve descriptions such as "first" or "second," these descriptions are for descriptive purposes only and should not be construed as indicating or implying their relative importance or implicitly specifying the number of technical features indicated. Therefore, a feature defined with "first" or "second" may explicitly or implicitly include at least one of those features. Additionally, the use of "and / or" or "and / or" throughout the text includes three parallel solutions. For example, "A and / or B" includes solution A, solution B, or a solution that simultaneously satisfies A and B. Furthermore, the technical solutions of the various embodiments can be combined with each other, but this must be based on the ability of those skilled in the art to implement them. When the combination of technical solutions is contradictory or impossible to implement, it should be considered that such a combination of technical solutions does not exist and is not within the scope of protection claimed in this application.

[0045] Currently, various display devices have become the main carriers for people to obtain audiovisual information. However, the user experience of display devices in complex environments faces a prominent challenge: environmental noise can seriously interfere with the sound playback of the screen itself.

[0046] Specifically, when users use display devices in noisy outdoor or public places, various noises in the environment will mix with the original sound waves emitted by the screen after propagating to the screen surface due to the physical properties of sound wave reflection, interference and diffraction. This mixing is not a simple superposition; it will cause the sound transmitted to the human ear to become muddy and unclear. The clarity and recognizability of the main audio information will be greatly reduced, making it difficult for users to clearly hear the sound information output by the display device, thereby reducing the audio-visual immersion and the overall user experience.

[0047] To address the aforementioned issues, this application proposes a display panel with a sound-absorbing cavity within a black matrix area. An electric field generating module and an electro-actuated movable unit are configured within the sound-absorbing cavity. When ambient noise is present, the driving electric field generated by the electric field generating module causes the electro-actuated movable unit to shift or deform. This causes the shifted or deformed electro-actuated movable unit to dynamically form a Helmholtz resonator within the sound-absorbing cavity. This Helmholtz resonator absorbs ambient noise and converts it into heat energy, thereby achieving noise reduction. This reduces the adverse effects of ambient noise on the audio information emitted by the display device, purifying the screen sound and improving the user's audiovisual experience.

[0048] Please see Figure 1 and supplementary reference Figures 2 to 7 An embodiment of this application provides a display panel including:

[0049] A color filter substrate 1, a black matrix region 2 is formed on the color filter substrate 1, and a sound-absorbing cavity 21 is provided in the black matrix region 2;

[0050] Electric field generating module 3 is disposed inside the sound-absorbing cavity 21; electric field generating module 3 is used to generate a driving electric field inside the sound-absorbing cavity 21.

[0051] An electro-movable unit 4 is disposed within the sound-absorbing cavity 21; the electro-movable unit 4 generates displacement or deformation in response to a driving electric field to form at least one Helmholtz resonator having a neck and a cavity, thereby changing the acoustic impedance of the display panel through the Helmholtz resonator; wherein, the equivalent hydrodynamic diameter of the neck is smaller than the equivalent hydrodynamic diameter of the cavity.

[0052] In this embodiment, the color filter substrate 1 is the substrate in the display panel that carries the color filtering function. The color filter substrate 1 is typically provided with an array of red (R) filter units, green (G) filter units, and blue (B) filter units. The area between the above-mentioned filter units is filled with an opaque black matrix material layer. The entire area covered by the black matrix material layer constitutes the black matrix area 2. The black matrix area 2 is a non-display area in the display panel used to isolate light crosstalk and does not participate in active light emission.

[0053] The improvement of this embodiment is that a cavity structure is set at the position corresponding to the black matrix area 2 to form a sound-absorbing cavity 21. The top of the sound-absorbing cavity 21 is covered by a black matrix material layer, so that it is completely hidden optically. An electric field generating module 3 and an electro-actuated movable unit 4 are set inside the sound-absorbing cavity 21.

[0054] The electric field generating module 3 is used to generate a driving electric field within the sound-absorbing cavity 21. It can employ any electric field generation method known in the art and suitable for sealed microcavity structures. Specifically, the electric field generating module 3 can establish a controllable electrostatic field or low-frequency alternating electric field in the internal space of the sound-absorbing cavity 21 by receiving an electrical signal provided by an external control circuit. The existence and changes of this electric field are the energy source and control means for driving the electro-actuated movable unit 4 to undergo displacement or deformation, thereby achieving dynamic reconstruction of the acoustic structure. User control of the electric field generating module 3 is specifically manifested in changing parameters such as the voltage, waveform, frequency, and timing of the applied electrical signal through an external control circuit to precisely adjust the state of the generated driving electric field.

[0055] The electro-movable unit 4 is disposed within the range of action of the aforementioned driving electric field and is configured to undergo displacement or deformation in response to the driving electric field. In this way, the electro-movable unit 4 dynamically constitutes at least one Helmholtz resonator within the sound-absorbing cavity 21. The Helmholtz resonator has a neck and a cavity, and the equivalent hydrodynamic diameter of the neck is smaller than the equivalent hydrodynamic diameter of the cavity.

[0056] A Helmholtz resonator is an acoustic resonance structure whose working principle can be compared to a spring-damped-mass system. The air column at the neck can be considered a mass, and the air in the cavity can be considered a spring. When the frequency of an external sound wave matches the system's natural frequency, the air column at the neck resonates and vibrates violently. During this process, through friction and viscosity between air molecules and the inner walls of the structure, as well as friction and viscosity within the air molecules themselves, the energy of the sound wave is effectively converted into heat and dissipated, thus achieving the purpose of absorbing noise of a specific frequency.

[0057] In this embodiment, the Helmholtz resonator is not a pre-fixed structure, but is formed by actively controlling the position or shape reconstruction of the electro-movable unit 4 through a driving electric field. The physical basis for achieving this controllable reconstruction is diverse; for example, when the electro-movable unit 4 consists of a large number of solid particles, dielectric force can be used to cause the solid particles with different dielectric constants to move differentially in the driving electric field, thereby dispersing them in space and forming a microstructure with complex pores. These pores constitute the neck and cavity sections required to achieve the sound absorption function. Alternatively, when the electro-movable unit 4 contains magnetoelectric materials, the electric field can be used to change its magnetization state, causing each electro-movable unit 4 to shift due to mutual attraction or repulsion, thus forming a neck and cavity section with controllable width. Furthermore, based on other electric field response mechanisms such as electrostriction and electrorheological effects, the functional materials or fluids constituting the electro-movable unit 4 can also undergo morphological changes, thereby achieving a similar reconstruction of the acoustic boundary conditions. It can be seen that by designing the material properties and initial configuration of the electro-movable unit 4, and by adjusting the corresponding parameters of the electric field generating module 3 to control the electric field parameters of the driving electric field it generates, a neck and cavity with a specific configuration and size can be flexibly constructed in the sound-absorbing cavity 21, thereby forming a Helmholtz resonator with a preset shape to absorb environmental noise of different frequency bands in a targeted manner.

[0058] Therefore, in this embodiment, a sound-absorbing cavity 21 is provided within the black matrix region 2 of the color filter substrate 1, and an electric field generating module 3 and an electro-actuated movable unit 4 are provided within the sound-absorbing cavity 21. The driving electric field generated by the electric field generating module 3 can drive the electro-actuated movable unit 4 to move or deform within the sound-absorbing cavity 21, thereby dynamically forming a Helmholtz resonator with a specific dimensional relationship. Based on this solution, the following comprehensive technical effects can be achieved:

[0059] I. By employing an actively constructed Helmholtz resonator, effective absorption of environmental noise and purification of screen sound are achieved. Specifically, the Helmholtz resonator, composed of an electro-dynamic unit 4, has a narrow neck and a wide cavity. When the frequency of external environmental noise matches the natural frequency of the Helmholtz resonator, the air column in the neck resonates strongly, generating large-amplitude reciprocating vibrations. During this resonance process, based on the friction and viscosity between air molecules, and the friction and viscosity between air molecules and the walls of the neck and the inner walls of the cavity, the mechanical energy of the sound waves is efficiently converted into heat energy and dissipated. This physical process directly absorbs and eliminates environmental noise energy in specific frequency bands along the propagation path, thereby significantly reducing the intensity of environmental noise transmitted to the human ear. Based on the above solution, the interference caused by environmental noise on the audio information emitted by the screen itself can be weakened, effectively improving the clarity and purity of the audio signal transmitted from the screen to the human ear, ultimately fundamentally improving the user's audiovisual experience in noisy environments.

[0060] Second, it achieves active and reversible electronic control of the acoustic function. Specifically, since the reconstruction of the acoustic structure in this scheme relies on the driving electric field to drive the electro-actuated movable unit 4, the noise reduction function can be controlled to start and stop in a very short time simply by applying or removing an electrical signal to the electric field generating module 3 through an external circuit. Furthermore, the sound absorption frequency can be finely adjusted by adjusting the electrical signal parameters. This direct control method based on electrical signals makes it simple and quick for users to operate the noise reduction function, thus achieving one-click switching of the noise reduction function.

[0061] Third, a high degree of invisibility integration between the acoustic structure and the display panel is achieved. In this solution, the sound-absorbing cavity 21 is placed within the black matrix area 2. The black matrix area 2 is an inherent non-display area on the display panel, which is opaque. In this way, the physical space and optical shielding characteristics of the black matrix area 2 can be used to hide the entire sound-absorbing system within the black matrix area 2. Thus, while achieving the sound absorption and noise reduction function, it can avoid occupying the effective pixel light-emitting area on the display panel, and it can also avoid excessively increasing the overall size of the display panel due to the addition of this sound-absorbing system.

[0062] Fourth, it enables high-fidelity and latency-free audio signal processing. Since the noise reduction mechanism of this solution is a purely energy-consuming process, independent of the audio electrical signal processing link of the display device, it avoids the signal processing delay and audio quality algorithm distortion problems caused by digital noise reduction technology, reduces additional power consumption, and ensures the integrity and real-time performance of the original audio signal.

[0063] In one embodiment, refer to Figure 2 and Figure 3The electric field generating module 3 includes a first electrode 31 and a second electrode 32 arranged opposite to each other.

[0064] Specifically, when a voltage is applied to the first electrode 31 and the second electrode 32, a driving electric field can be established in the cavity space between them. By controlling the voltage applied to the first electrode 31 and the second electrode 32 through an external circuit, the strength of the driving electric field and the switching state can be easily adjusted, thereby providing the required electric field force for the operation of the electro-actuated movable unit 4.

[0065] In one embodiment, refer to Figure 2 and Figure 3 The electro-movable unit 4 includes multiple electro-movable particles 41, and the dielectric constants of the multiple electro-movable particles 41 have a difference.

[0066] When no driving electric field is generated in the sound-absorbing cavity 21, multiple electro-movable particles 41 are stacked at the bottom of the sound-absorbing cavity 21; when a driving electric field is generated in the sound-absorbing cavity 21, multiple electro-movable particles 41 are dispersed in the sound-absorbing cavity 21 in response to the driving electric field.

[0067] This embodiment provides a first specific implementation of the dynamic reconstruction of the acoustic structure by the electrodynamically movable unit 4 in response to a driving electric field. Specifically, electrodynamically movable particles 41 are filled within the sound-absorbing cavity 21; the electrodynamically movable particles 41 can be black metal oxide particles, carbon black composite particles, or other dielectric material particles with an insulating surface treatment. To achieve differentiated movement of the electrodynamically movable particles 41 in the driving electric field, each electrodynamically movable particle 41 is designed to have a different dielectric constant; for example, this can be achieved by coating the surface of the core particle with insulating layers of different materials or thicknesses, or by directly mixing multiple material particles with different intrinsic dielectric constants, which is not limited here.

[0068] Based on the above settings, its working process is as follows:

[0069] like Figure 2 As shown, when no driving electric field is generated inside the sound-absorbing cavity 21, the electrodynamic particles 41 tend to settle and accumulate relatively tightly at the bottom of the sound-absorbing cavity 21 under the influence of gravity, van der Waals forces, etc. When the noise reduction function needs to be activated, the user controls the electric field generation module 3 to generate a driving electric field inside the sound-absorbing cavity 21. Since the dielectric constants of the various electrodynamic particles 41 are different, the magnitude and direction of the dielectric electrophoretic force experienced by different electrodynamic particles 41 in the driving electric field are also different. Driven by this differentiated force, the electrodynamic particles 41 that were originally stacked at the bottom of the sound-absorbing cavity 21 will undergo complex movements, thereby realizing the rearrangement of their positions.

[0070] Ultimately, as Figure 3As shown, electrodynamically movable particles 41 reach an equilibrium state under the influence of electric field forces and fluid resistance, and are dispersed within the sound-absorbing cavity 21. In this equilibrium state, numerous meandering microscopic gaps are formed between the electrodynamically movable particles 41 and between the electrodynamically movable particles 41 and the cavity walls of the sound-absorbing cavity 21. These gaps constitute two types of microstructures: the first type is narrow microchannels with a small equivalent hydrodynamic diameter, which can be equivalent to the neck of a Helmholtz resonator; the second type is irregular cavities formed by the particle swarm and connected to the aforementioned microchannels, which can be equivalent to the cavity portion of a Helmholtz resonator. The numerous distribution of these microstructures within the sound-absorbing cavity 21 makes the entire sound-absorbing cavity 21 macroscopically equivalent to an array composed of numerous miniature Helmholtz resonators of different sizes. This array can effectively absorb ambient noise over a wide frequency range.

[0071] In practical applications, by adjusting parameters such as the intensity and frequency of the driving electric field, the dielectric electrophoretic force experienced by the electrokinetic particles 41 can be further adjusted. This allows for adjustment of the density of the electrokinetic particles 41 and the resulting microstructure, thereby regulating the sound absorption characteristics. After the driving electric field generated by the electric field generation module 3 within the sound-absorbing cavity 21 is stopped, the electrokinetic particles 41 will re-settle and stack under the influence of gravity, etc., to form... Figure 2 The state shown causes the acoustic structure inside the sound-absorbing cavity 21 to disappear and the noise reduction function to be turned off.

[0072] This embodiment utilizes the motion of electrodynamic particles 41 under a driving electric field to reconstruct the acoustic structure. Its structure is relatively simple and does not require complex micromechanical moving parts. It can conveniently control the opening and closing of the noise reduction function and easily achieve a wideband sound absorption effect.

[0073] In one embodiment, refer to Figure 2 and Figure 3 Electro-movable particles 41 are made of ferrous metal particles.

[0074] In this embodiment, black metal particles can refer to tiny particles composed of metals such as iron, cobalt, and nickel or their alloys. These materials are dark or black due to their composition and microstructure. When placed in the sound-absorbing cavity 21 of the black matrix area 2, they can effectively absorb stray light and help maintain the light-shielding properties of the black matrix area 2 on the display panel.

[0075] In practical applications, in order for the aforementioned ferrous metal particles to function effectively as dielectrics in the driving electric field, their surfaces can be insulated. For example, a resistive material composed of a specific polymer can be wrapped around their surfaces to form an insulating shell. This insulating shell can not only prevent direct conductivity between the electrokinetic particles 41 and between the electrokinetic particles 41 and the electrodes, but also, by selecting coating materials with different dielectric constants or controlling the thickness of the coating layer, different electrokinetic particles 41 can be given different overall equivalent dielectric constants. This allows each electrokinetic particle 41 to be subjected to dielectric electrophoretic forces of different magnitudes or directions in the driving electric field, thereby achieving the required differentiated motion and acoustic structure reconstruction.

[0076] In one embodiment, refer to Figure 4 and Figure 5 The electro-magnetic movable unit 4 includes a plurality of first magnetic elements 421 and a plurality of second magnetic elements 422. The plurality of first magnetic elements 421 are stacked, and a second magnetic element 422 is disposed between any two adjacent first magnetic elements 421.

[0077] When no driving electric field is generated in the sound-absorbing cavity 21, the magnetism of the first magnetic element 421 is opposite to that of the second magnetic element 422, and the multiple first magnetic elements 421 and the multiple second magnetic elements 422 remain in a stacked state under the magnetic attraction. When a driving electric field is generated in the sound-absorbing cavity 21, the first magnetic element 421 or the second magnetic element 422 responds to the driving electric field and undergoes magnetic reversal. The multiple first magnetic elements 421 and the multiple second magnetic elements 422 move upward under the magnetic repulsion, and a current-passing gap 423 is formed between adjacent first magnetic elements 421 and second magnetic elements 422.

[0078] This embodiment provides a second specific implementation method for the electrodynamic movable unit 4 to achieve dynamic reconstruction of the acoustic structure in response to a driving electric field. Specifically, the first magnetic element 421 and the second magnetic element 422 can be configured as sheet-like structures, and arranged as follows: Figure 4 The alternating layering method shown is used to stack the magnetic elements in the sound-absorbing cavity 21. For example, when the bottom layer of the sound-absorbing cavity 21 is the first magnetic element 421, the second layer should be the second magnetic element 422, the third layer should be the first magnetic element 421, the fourth layer should be the second magnetic element 422, the fifth layer should be the first magnetic element 421, and so on. Similarly, when the bottom layer of the sound-absorbing cavity 21 is the second magnetic element 422, the second layer should be the first magnetic element 421, the third layer should be the second magnetic element 422, the fourth layer should be the first magnetic element 421, the fifth layer should be the second magnetic element 422, and so on.

[0079] To achieve stable stacking of the first magnetic component 421 and the second magnetic component 422 in the initial state, the first magnetic component 421 and the second magnetic component 422 are configured to have opposite magnetism in the initial state; for example, the first magnetic component 421 is set to N pole and the second magnetic component 422 is set to S pole. In this way, based on the property that opposite poles attract each other, the adjacent magnetic components can be tightly attached under the action of magnetic force, and the whole can maintain a stable stacked state.

[0080] Furthermore, the magnetization state of one type of magnetic component (e.g., the first magnetic component 421 or the second magnetic component 422) is configured to change directly or indirectly under the influence of a driving electric field. In practical applications, this type of magnetic component can be made of multiferroic materials, such as BiFeO3. There is a strong coupling between the polarization and magnetization within this type of multiferroic material; applying an external electric field can induce a deterministic reversal of its magnetization direction, i.e., magnetic reversal. Specifically, assuming the second magnetic component 422 is initially an S pole, when the second magnetic component 422 is made of the aforementioned multiferroic material, after placing the second magnetic component 422 in a driving electric field, the magnetism of the second magnetic component 422 will reverse to an N pole.

[0081] Based on the above settings, its working process is as follows:

[0082] Assuming the first magnetic element 421 is the N pole and the second magnetic element 422 is the S pole, and the second magnetic element 422 is configured to undergo magnetic reversal in response to a driving electric field; in the initial state, such as Figure 4 As shown, the first magnetic element 421 and the second magnetic element 422 are stacked alternately in the sound-absorbing cavity 21. Since the first magnetic element 421 and the second magnetic element 422 have opposite magnetic properties, based on the property of attraction between opposite poles, it can be ensured that multiple first magnetic elements 421 and multiple second magnetic elements 422 are stably attracted and the whole remains in a stable stacked state. When the noise reduction function needs to be activated, a driving electric field is generated in the sound-absorbing cavity 21 by the electric field generation module 3. At this time, the magnetism of the first magnetic element 421 remains unchanged, and the second magnetic element 422 will undergo magnetic reversal under the action of the driving electric field and become the N pole. In this way, the adjacent first magnetic elements 421 and second magnetic elements 422 can change from an opposite pole attraction state to an like pole repulsion state. Figure 5 As shown, under the action of mutually repulsive magnetic forces, each magnetic component moves upward along the direction away from the magnetic component below it, causing the first magnetic component 421 and the second magnetic component 422, which were originally closely attached, to separate from each other in the vertical direction. A certain gap will be formed between adjacent first magnetic components 421 and second magnetic components 422, thereby forming multiple intermittently arranged flow gaps 423 in the vertical direction.

[0083] In specific implementation, multiple alternating layers of first magnetic elements 421 and multiple second magnetic elements 422 constitute a magnetic element group 42. When only one magnetic element group 42 is provided in the sound-absorbing cavity 21, the multiple current-passing gaps 423 formed by the magnetic element group 42 under the driving electric field can collectively constitute the neck of the Helmholtz resonator, and the area enclosed by the cavity wall of the sound-absorbing cavity 21 and communicating with the current-passing gaps 423 can constitute the cavity of the Helmholtz resonator. When at least two magnetic element groups 42 are provided in the sound-absorbing cavity 21, if the height of the multiple current-passing gaps 423 formed by one magnetic element group 42 under the driving electric field is small, then this part of the current-passing gaps 423 can collectively constitute the neck of the Helmholtz resonator; while the height of the multiple current-passing gaps 423 formed by the other magnetic element group 42 under the driving electric field is large, then this part of the current-passing gaps 423 can collectively constitute the cavity of the Helmholtz resonator. In practical applications, it is only necessary to ensure that the first magnetic component 421 and the second magnetic component 422 undergo position reconstruction under the action of the driving electric field, thereby dividing the space inside the sound-absorbing cavity 21 into several sub-regions with different sizes. In this way, a Helmholtz resonator can be formed inside the sound-absorbing cavity 21, and the Helmholtz resonator can be used to resonate and absorb environmental noise, thereby achieving the sound absorption and noise reduction function.

[0084] After the driving electric field generated by the electric field generating module 3 in the sound-absorbing cavity 21 is stopped, the first magnetic component 421 and the second magnetic component 422 will restore their initial magnetization directions, thus recovering their original magnetization directions under the influence of mutual magnetic attraction and gravity. Figure 4 The tightly fitted, stacked state shown causes the acoustic structure inside the sound-absorbing cavity 21 to disappear and the noise reduction function to be turned off.

[0085] In practical applications, by designing the size of the magnetic components, the strength of the magnetism, and the intensity of the driving electric field, the repulsive force between the magnetic components and the size of the final overcurrent gap 423 can be precisely controlled, thereby achieving the absorption of noise at a specific resonant frequency.

[0086] In one embodiment, refer to Figure 4 and Figure 5 The electro-movable unit 4 includes at least two magnetic component groups 42 arranged at intervals along the horizontal direction. Each magnetic component group 42 includes a plurality of first magnetic components 421 and a plurality of second magnetic components 422 stacked together. The width of each magnetic component group 42 gradually increases from bottom to top.

[0087] In this embodiment, at least two groups of magnetic components 42 arranged horizontally at intervals are disposed within the sound-absorbing cavity 21. Each group of magnetic components 42 is composed of alternating layers of multiple first magnetic components 421 and multiple second magnetic components 422. For example... Figure 4As shown, each magnetic component group 42 is configured with a shape whose width gradually increases from bottom to top, so that each magnetic component group 42 presents an inverted pyramid shape that is wider at the top and narrower at the bottom when not subjected to a driving electric field. It can be understood that to make the magnetic component group 42 present the aforementioned inverted pyramid shape, the lateral width of the upper magnetic component can be set to be greater than that of the lower magnetic component. The specific setting can be flexibly adjusted according to the actual situation; for example, several adjacent magnetic components can maintain the same lateral width, while several magnetic components above them can use a larger lateral width, thus making the magnetic component group 42 present an inverted pyramid shape. Figure 4 The segmented, stepped structure shown; or ensuring that the lateral width of each magnetic component is greater than the lateral width of the magnetic component below it, so that the magnetic component group 42 as a whole presents a continuous stepped structure.

[0088] Based on the above configuration, when each magnetic component group 42 is subjected to a driving electric field, the corresponding magnetic components in each magnetic component group 42 will undergo magnetic reversal. This will cause the originally tightly fitted first magnetic component 421 and second magnetic component 422 to separate vertically under the mutual repulsive magnetic force. A certain gap will be formed between adjacent first magnetic components 421 and second magnetic components 422, thus forming multiple intermittently arranged current-passing gaps 423 in the vertical direction. At this time, if... Figure 5 As shown, a cavity structure with a narrow upper end and a wide lower end is also formed between two adjacent magnetic component groups 42. This cavity structure constitutes a complete Helmholtz resonator. The narrow area at the upper end is equivalent to the neck of the Helmholtz resonator, and the gradually widening space at the lower end is equivalent to the cavity of the Helmholtz resonator. This Helmholtz resonator can be used to further absorb environmental noise of a specific frequency and convert it into heat energy for dissipation, thereby improving the sound absorption and noise reduction effect of the display panel.

[0089] In addition, based on the overall shape of the magnetic component group 42, which is wider at the top and narrower at the bottom, when the stacked magnetic components move upward under the mutual repulsive magnetic force, the upper magnetic component with a larger lateral width will contact the side of the adjacent magnetic component group 42. This can limit the irregular lateral displacement of the magnetic components in each magnetic component group 42 in the future, so that each magnetic component group 42 can stably maintain the preset posture after being unfolded, thereby improving the structural stability of the sound absorption system.

[0090] In one embodiment, refer to Figure 4 and Figure 5 When a driving electric field is generated in the sound-absorbing cavity 21, multiple first magnetic elements 421 and multiple second magnetic elements 422 in any magnetic element group 42 are aligned with multiple overcurrent gaps 423 in the adjacent magnetic element group 42.

[0091] In this embodiment, as Figure 5 As shown, the magnetic components in adjacent magnetic component groups 42 are staggered in the vertical direction. In actual operation, the bottom magnetic components in two adjacent magnetic component groups 42 can have different thicknesses. This initial thickness difference causes the two magnetic component groups 42 to expand upward under the action of the driving electric field, so that the magnetic components in one magnetic component group 42 can naturally align with the current gap 423 in the other magnetic component group 42, thus avoiding the alignment of the magnetic components in one magnetic component group 42 with the magnetic components in the other magnetic component group 42.

[0092] Based on the aforementioned staggered arrangement of the magnetic components, when sound waves horizontally pass through the array composed of multiple magnetic component groups 42, the propagation path of the sound waves is forcibly shaped into a tortuous channel that repeatedly meanders. This allows the sound waves to rub and collide more frequently and intensely with the surface of the magnetic components, thereby improving the efficiency of converting environmental noise energy into heat energy. Furthermore, due to the formation of various acoustic paths, it helps to effectively absorb noise over a wider frequency range, thereby enhancing the overall sound absorption and noise reduction effect.

[0093] In one embodiment, refer to Figure 4 and Figure 5 The first magnetic component 421 has an arched structure with a high center and low sides, and the second magnetic component 422 has an arched structure with a high center and low sides.

[0094] Based on the arched structure design of the first magnetic component 421 and the second magnetic component 422, when the first magnetic component 421 and the second magnetic component 422 are initially stacked together, the protruding part of one magnetic component will form a more stable nesting fit with the corresponding recessed area of ​​the other magnetic component, thereby limiting possible lateral displacement between the magnetic components and enhancing the stability of the stacked structure. Furthermore, as the driving electric field is generated and disappears, during the separation and repositioning process of the first magnetic component 421 and the second magnetic component 422, the aforementioned arched structure can play a certain guiding role, helping to ensure that each magnetic component moves smoothly along a preset direction, thereby improving and maintaining the controllability of the sound absorption system.

[0095] In one embodiment, refer to Figure 6 and Figure 7 The electro-actuable unit 4 includes an elastic element 431 and two electromagnetic plates 432. One end of the elastic element 431 is fixedly disposed, and the other end of the elastic element 431 is connected to at least one electromagnetic plate 432.

[0096] When no driving electric field is generated in the sound-absorbing cavity 21, the two electromagnetic plates 432 are in contact with each other under the elastic force of the elastic member 431; when a driving electric field is generated in the sound-absorbing cavity 21, the two electromagnetic plates 432 generate magnetism in response to the driving electric field, and the two electromagnetic plates 432 overcome the elastic force of the elastic member 431 and move away from each other under the action of magnetism, thereby forming a flow channel 433 between the two electromagnetic plates 432.

[0097] This embodiment provides a third specific implementation of the dynamic reconstruction of the acoustic structure by the electrodynamic movable unit 4 in response to the driving electric field. The electromagnetic plate 432 can change its own magnetic state in response to the external electric field; specifically, the electromagnetic plate 432 can be made of magnetoelectric materials or multiferroic materials (such as BiFeO3); there is a strong coupling between the polarization and magnetization inside such materials, and the external electric field can directly induce it to generate or change the magnetization intensity, magnetization direction, etc. based on the magnetoelectric effect.

[0098] The elastic element 431 can be a spring, elastic colloid, etc.; one end of the elastic element 431 is fixedly disposed in a preset position inside the sound-absorbing cavity 21, for example, it can be fixed to the bottom or side wall of the sound-absorbing cavity 21; the other end of the elastic element 431 is connected to at least one electromagnetic plate 432, thereby providing elastic constraint and elastic recovery force for the electromagnetic plate 432.

[0099] Based on the above settings, Figure 6 and Figure 7 As shown in the example, the elastic element 431 on the left is connected to the electromagnetic plate 432 on the left, and the elastic element 431 on the right is connected to the electromagnetic plate 432 on the right. The specific working process is as follows:

[0100] like Figure 6 As shown, when no driving electric field is generated in the sound-absorbing cavity 21, the electromagnetic plates 432 are not effectively excited. At this time, there is no significant magnetic interaction force between the two electromagnetic plates 432. Therefore, under the elastic restoring force provided by the elastic element 431, the two electromagnetic plates 432 will be pushed and kept in a state of mutual contact. When a driving electric field is generated by the electric field generating module 3, the driving electric field acts on the electromagnetic plates 432, and the electromagnetic plates 432 will be excited and exhibit obvious magnetism; specifically, as shown... Figure 7As shown, the two electromagnetic plates 432 are configured to be magnetized to the same polarity (e.g., both are N poles) under the action of the driving electric field. Thus, the two electromagnetic plates 432 will generate a repulsive magnetic force. This magnetic force can drive the left electromagnetic plate 432 to move to the left against the elastic force of the left elastic member 431, and drive the right electromagnetic plate 432 to move to the right against the elastic force of the right elastic member 431, so that the two electromagnetic plates 432 move away from each other, thereby forming a current channel 433 between the two electromagnetic plates 432.

[0101] In specific implementation, the elastic element 431 and the corresponding two electromagnetic plates 432 are used as one electromagnetic component 43. When only one electromagnetic component 43 is provided in the sound-absorbing cavity 21, the flow channel 433 formed by the electromagnetic component 43 under the driving electric field can constitute the neck of the Helmholtz resonator, and the area enclosed by the cavity wall of the sound-absorbing cavity 21 and connected to the flow channel 433 can constitute the cavity of the Helmholtz resonator. When at least two electromagnetic components 43 are provided in the sound-absorbing cavity 21, if the width of the flow channel 433 formed by one electromagnetic component 43 under the driving electric field is small, then the flow channel 433 can constitute the neck of the Helmholtz resonator; while the width of the flow channel 433 formed by the other electromagnetic component 43 under the driving electric field is large, then the flow channel 433 can constitute the cavity of the Helmholtz resonator. In this way, the Helmholtz resonator can be used to absorb environmental noise through resonance, thereby achieving the function of sound absorption and noise reduction.

[0102] After the driving electric field generated by the electric field generating module 3 in the sound-absorbing cavity 21 is stopped, as Figure 6 As shown, the two electromagnetic plates 432 will return to their initial fit under the elastic restoring force of the elastic member 431, causing the acoustic structure inside the sound-absorbing cavity 21 to disappear and the noise reduction function to be turned off.

[0103] In one embodiment, refer to Figure 6 and Figure 7 The electro-actuable unit 4 includes at least two electromagnetic components 43 arranged at intervals, each electromagnetic component 43 including an elastic element 431 and two electromagnetic plates 432.

[0104] There is a difference in the magnetoelectric coupling coefficient of the electromagnetic plates 432 in at least two electromagnetic components 43; and / or, there is a difference in the elastic coefficient of the elastic elements 431 in at least two electromagnetic components 43.

[0105] In the case where the sound-absorbing cavity 21 contains at least two spaced electromagnetic components 43, in order to enable different electromagnetic components 43 to produce different responses under the same driving electric field, i.e. to form Helmholtz resonators with different neck sizes and different cavity sizes, this embodiment has made differentiated parameter settings for each electromagnetic component 43.

[0106] Specifically, the aforementioned differentiated parameter settings are mainly reflected in the following two aspects, which can be adjusted independently or jointly:

[0107] Firstly, this is reflected in the material properties of the electromagnetic plate 432 itself. As described in the previous embodiment, the magnetization capability of the electromagnetic plate 432 originates from its magnetoelectric properties, and the magnetoelectric coupling coefficient is a key parameter for measuring the efficiency of a material in converting an electric field into a magnetization change. By selecting materials with different magnetoelectric coupling coefficients to manufacture the electromagnetic plate 432 for different electromagnetic components 43, the electromagnetic plates 432 of different electromagnetic components 43 can generate magnetization of different intensities under the same driving electric field, thereby generating magnetic forces of different magnitudes.

[0108] Secondly, this is reflected in the mechanical characteristics of the elastic element 431. The elastic coefficient of the elastic element 431 determines the ease with which it deforms under stress; under the same magnetic force, the elastic element 431 with a smaller elastic coefficient will produce a larger deformation displacement, while the elastic element 431 with a larger elastic coefficient will produce a smaller deformation displacement. Therefore, by setting the elastic elements 431 in different electromagnetic components 43 to have different elastic coefficients, even if the electromagnetic plates 432 in different electromagnetic components 43 generate the same magnetic force under the driving electric field, the electromagnetic plates 432 can move to different positions after overcoming different elastic forces.

[0109] By combining one or two of the above design methods, multiple current channels 433 with varying widths can be formed by different electromagnetic components 43 under the same driving electric field. Figure 6 and Figure 7 As shown in the example, the electro-movable unit 4 includes three electromagnetic components 43 arranged vertically at intervals. Under the action of the driving electric field, the width of the current channel 433 formed by the uppermost electromagnetic component 43 is smaller, while the width of the current channel 433 formed by the two lower electromagnetic components 43 is larger. At this time, the uppermost current channel 433 can form the neck of the Helmholtz resonator, and the two lower current channels 433 can form the cavity of the Helmholtz resonator. Thus, the Helmholtz resonator can be used to resonate and absorb environmental noise, thereby achieving the function of sound absorption and noise reduction.

[0110] Based on the solution of this embodiment, Helmholtz resonators with different neck sizes and different cavity sizes can be easily constructed according to actual needs, so as to absorb sound waves of different frequencies, thereby improving application flexibility; and there is no need to configure complex control circuits for each electromagnetic component 43, thereby simplifying the circuit structure of the display panel while realizing the sound absorption and noise reduction function.

[0111] It should be noted that the three specific implementation methods proposed in the above embodiments for the electro-movable unit 4 to realize dynamic reconstruction of the acoustic structure in response to the driving electric field can be applied simultaneously to different sound-absorbing cavities 21 of the same display panel in actual operation.

[0112] This application also provides a display device; please refer to [link / reference]. Figures 1 to 7 The display device includes the display panel in any of the above embodiments.

[0113] In this embodiment, the display device may include any terminal device with display function, such as a mobile phone or a tablet computer.

[0114] For the specific structure of the display panel, please refer to the description of the above embodiments. Since the display device in this embodiment adopts all the technical solutions of all the above embodiments, it has at least all the beneficial effects brought about by the technical solutions of the above embodiments, and will not be repeated here.

[0115] The above description is merely an exemplary embodiment of this application and does not limit the patent scope of this application. Any equivalent structural transformations made based on the technical concept of this application and the contents of the specification and drawings of this application, or direct / indirect applications in other related technical fields, are included within the patent protection scope of this application.

Claims

1. A display panel, characterized in that, The display panel includes: A color filter substrate, wherein a black matrix region is formed on the color filter substrate, and a sound-absorbing cavity is provided in the black matrix region; An electric field generating module is disposed within the sound-absorbing cavity; the electric field generating module is used to generate a driving electric field within the sound-absorbing cavity. An electro-movable unit is disposed within the sound-absorbing cavity; the electro-movable unit generates displacement or deformation in response to the driving electric field to form at least one Helmholtz resonator having a neck and a cavity, thereby changing the acoustic impedance of the display panel through the Helmholtz resonator; wherein the equivalent hydrodynamic diameter of the neck is smaller than the equivalent hydrodynamic diameter of the cavity.

2. The display panel according to claim 1, characterized in that, The electro-movable unit includes multiple electro-movable particles, and the dielectric constants of the multiple electro-movable particles have a difference. When no driving electric field is generated in the sound-absorbing cavity, a plurality of electro-movable particles are stacked at the bottom of the sound-absorbing cavity; when the driving electric field is generated in the sound-absorbing cavity, a plurality of electro-movable particles are dispersed in the sound-absorbing cavity in response to the driving electric field.

3. The display panel according to claim 2, characterized in that, The electrodynamic particles are made of ferrous metal.

4. The display panel according to claim 1, characterized in that, The electro-magnetic movable unit includes a plurality of first magnetic elements and a plurality of second magnetic elements. The plurality of first magnetic elements are stacked, and a second magnetic element is disposed between any two adjacent first magnetic elements. When no driving electric field is generated in the sound-absorbing cavity, the magnetism of the first magnetic element is opposite to that of the second magnetic element, and the plurality of first magnetic elements and the plurality of second magnetic elements remain in a stacked state under the magnetic attraction. When the driving electric field is generated in the sound-absorbing cavity, the first magnetic element or the second magnetic element responds to the driving electric field and undergoes magnetic reversal. The plurality of first magnetic elements and the plurality of second magnetic elements move upward under the magnetic repulsion, and a current-passing gap is formed between adjacent first magnetic elements and second magnetic elements.

5. The display panel according to claim 4, characterized in that, The electro-movable unit includes at least two groups of magnetic components arranged at intervals along the horizontal direction. Each group of magnetic components includes a plurality of first magnetic components and a plurality of second magnetic components stacked together. The width of each group of magnetic components gradually increases from bottom to top.

6. The display panel according to claim 5, characterized in that, When the driving electric field is generated in the sound-absorbing cavity, the plurality of first magnetic elements and the plurality of second magnetic elements in any magnetic element group are aligned with the plurality of current-passing gaps in the adjacent magnetic element group. And / or, the first magnetic component has an arched structure with a high center and low sides, and the second magnetic component has an arched structure with a high center and low sides.

7. The display panel according to claim 1, characterized in that, The electro-actuable unit includes an elastic element and two electromagnetic plates. One end of the elastic element is fixedly disposed, and the other end of the elastic element is connected to at least one of the electromagnetic plates. When no driving electric field is generated in the sound-absorbing cavity, the two electromagnetic plates are attached to each other under the elastic force of the elastic member; when the driving electric field is generated in the sound-absorbing cavity, the two electromagnetic plates generate magnetism in response to the driving electric field, and the two electromagnetic plates overcome the elastic force of the elastic member and move away from each other under the action of magnetism, thereby forming a flow channel between the two electromagnetic plates.

8. The display panel according to claim 7, characterized in that, The electro-actuated movable unit includes at least two electromagnetic components arranged at intervals, and each electromagnetic component includes the elastic element and two electromagnetic plates. There is a difference in the magnetoelectric coupling coefficient of the electromagnetic plates in at least two of the electromagnetic components; and / or, there is a difference in the elastic coefficient of the elastic element in at least two of the electromagnetic components.

9. The display panel according to any one of claims 1 to 8, characterized in that, The electric field generating module includes a first electrode and a second electrode arranged opposite to each other.

10. A display device, characterized in that, The display device includes a display panel as claimed in any one of claims 1 to 9.

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