CN118118837A - Sounding screen and projection television - Google Patents

Abstract

The application provides a sound producing screen and a projection television. The display function layer comprises a diaphragm, a plurality of sound emitting cavities are arranged on the auxiliary sound emitting layer, the sizes of the sound emitting cavities are the same, a plurality of piezoelectric excitation units are respectively arranged in the sound emitting cavities, and the specifications of the piezoelectric excitation units are the same. Through the cooperation of the sounding cavity on the auxiliary sounding layer and the piezoelectric excitation unit, the unit vibrating diaphragm is formed to independently sound, and because the distribution of the freedom degree of the screen is different, the amplitudes of different areas of the screen are also different, so that sounding frequency bands of the unit vibrating diaphragm on different positions are different, and the loudness of the corresponding frequency bands is improved through the cavity.

Description

Sounding screen and projection television

The present application claims priority from the chinese patent application of application number 202211525321.4 filed at month 11 and 30 of 2022, the entire contents of which are incorporated herein by reference.

Technical Field

The application relates to the field of audio and video equipment, in particular to a sounding screen and a projection television.

Background

The projection device is a device capable of projecting images or videos onto a curtain, corresponding video signals can be played through connection of different interfaces, and the projection curtain with the sound production function, which is configured with the projection device to realize the sound production effect, is more and more widely applied, so that the projection is convenient, and the advantages of good sound production effect and the like are favored by users.

The projection equipment with the screen sounding function mainly comprises an electromagnetic exciter and a plate type screen, and the plate type screen is driven to vibrate by the electromagnetic exciter to realize sounding. The vibration mode of the electromagnetic exciter is as follows: the vibration in the opposite direction is carried out with the vibrating diaphragm attached to the plate-type screen, and the electromagnetic exciter is characterized by large vibration amplitude, so that when the electromagnetic exciter is applied to the plate-type screen, the plate-type screen and the electromagnetic exciter are required to be respectively limited and fixed in vibration, wherein the limiting of the plate-type screen can be realized through a frame fixing component, and the limiting of the electromagnetic exciter is realized through adding a fixing piece on the back of the electromagnetic exciter.

Therefore, the sounding screen is complex in structure and heavy, the weight reduction effect can be achieved through the thin plate type screen, but the thin plate type screen can be damaged in the vibration process due to the large amplitude of the electromagnetic exciter, the vibration effect is poor, and the use experience of a user is reduced.

Disclosure of Invention

Some embodiments of the present application provide a sound-producing screen and a projection television, so as to solve the problems of poor bass effect and insufficient loudness when the screen is reduced in weight by a weight-reducing functional layer in the existing projection device.

A first aspect of the present application provides a sound-emitting screen comprising:

A display function layer including a membrane;

the auxiliary sounding layer is provided with a plurality of sounding cavities, and the sounding cavities are the same in size;

The piezoelectric excitation units are respectively arranged in the sounding cavities, the specifications of the piezoelectric excitation units are the same, the piezoelectric excitation units are matched with the sounding cavities to form unit diaphragms, and sounding frequency bands of the unit diaphragms at different positions are different.

In some embodiments of the present application, the plurality of sound generating cavities are all disposed at a middle position of the auxiliary sound generating layer.

In some embodiments of the present application, the plurality of sound emitting cavities are all disposed at edge positions of the auxiliary sound emitting layer.

In some embodiments of the present application, the auxiliary sounding layer includes a plurality of sounding partitions, and the plurality of sounding cavities are respectively disposed at middle positions of the plurality of sounding partitions, or the plurality of sounding cavities are respectively disposed at edge positions of the plurality of sounding partitions.

In some embodiments of the present application, the plurality of sound emitting cavities are disposed at a middle position and an edge position of the auxiliary sound emitting layer.

In some embodiments of the present application, the piezoelectric excitation units are respectively disposed at one side of the sound generating cavities close to the diaphragm, or the piezoelectric excitation units are respectively disposed at one side of the sound generating cavities far from the diaphragm.

In some embodiments of the present application, the auxiliary sound-emitting layer includes a first skin, a second skin, and an intermediate layer; the middle layer comprises a honeycomb core formed by a plurality of unit cells, and the first skin and the second skin are respectively attached to two ends of the middle layer.

In some embodiments of the present application, a groove is disposed on a surface of the auxiliary sound generating layer away from the display function layer; and a first sealing layer is arranged on a side cover, far away from the display functional layer, of the groove, and the first sealing layer and the groove form the sounding cavity.

In some embodiments of the application, the depth of the groove is 1/4-4/3 of the thickness of the auxiliary sound-producing layer.

In some embodiments of the present application, the sound emitting screen further includes a shock absorbing sheet disposed between the first sealing layer and the auxiliary sound emitting layer.

In some embodiments of the present application, the auxiliary sound-producing layer is provided with a through hole; the depth direction of the through hole is parallel to the thickness direction of the auxiliary sounding layer, a second sealing layer is covered on one side of the through hole, which is far away from the display functional layer, and the through hole and the second sealing layer form the sounding cavity.

In some embodiments of the present application, the sounding cavities are arranged on the auxiliary sounding layer in a uniform arrangement, or in a cross arrangement, or in layers.

In some embodiments of the application, the sound emitting screen further comprises an adhesive layer; the bonding layer is positioned between the auxiliary sounding layer and the display functional layer, so that the auxiliary sounding layer and the display functional layer are bonded to form a vibrating diaphragm structure.

A second aspect of the present application provides a projection television, including the sound-emitting screen provided in the first aspect, and further including a projection device, where the projection device is configured to throw a projection screen onto the sound-emitting screen, and the sound-emitting screen is configured to display the projection screen thrown by the projection device.

In some embodiments of the present application, a sound emitting screen and a projection television provided by the present application include a display function layer, an auxiliary sound emitting layer, and a plurality of piezoelectric excitation units. The display function layer comprises a diaphragm, a plurality of sound emitting cavities are arranged on the auxiliary sound emitting layer, the sizes of the sound emitting cavities are the same, a plurality of piezoelectric excitation units are respectively arranged in the sound emitting cavities, the specifications of the piezoelectric excitation units are the same, the piezoelectric excitation units are matched with the sound emitting cavities to form unit diaphragms to independently emit sound, and the sum of sound emitting frequencies of the unit diaphragms forms a preset frequency response. Through the cooperation of the sound production cavity on the supplementary sound production layer and the piezoelectricity excitation unit, form resonant cavity, inside air column vibration promotes the loudness of corresponding frequency channel, effectively improves the bass effect of this sound production screen. And because the distribution of the degree of freedom of the screen is different, the amplitude of different areas is also different, therefore, the sounding frequency ranges of the unit diaphragms at different positions are different, each piezoelectric excitation unit is matched with the sounding cavity to form the unit diaphragm, the whole diaphragm is formed by a plurality of unit diaphragms, the unit diaphragms independently sound, the sum of the unit diaphragms forms the required frequency response, and the sounding loudness of the sounding screen is effectively improved.

Drawings

In order to more clearly illustrate the technical solution of the present application, the drawings that are needed in the embodiments will be briefly described below, and it will be obvious to those skilled in the art that other drawings can be obtained from these drawings without inventive effort.

FIG. 1 is a schematic illustration showing a projection apparatus according to an embodiment of the present application;

FIG. 2 is a schematic diagram of a sound screen according to an embodiment of the present application;

FIG. 3 is a perspective view of a sound screen according to an embodiment of the present application;

FIG. 4 is a front view of the mounting relationship of the auxiliary sound emitting layer and the piezoelectric excitation unit in an embodiment of the present application;

FIG. 5 is one of the left side views of the mounting relationship of the auxiliary sound emitting layer and the piezoelectric excitation unit in an embodiment of the present application;

FIG. 6 is a second left side view of the mounting relationship of the auxiliary sound layer and the piezoelectric excitation unit in accordance with an embodiment of the present application;

FIG. 7 is a third left side view of the mounting relationship of the auxiliary sound emitting layer and the piezoelectric excitation unit in accordance with an embodiment of the present application;

FIG. 8 is a fourth left side view of the mounting relationship of the auxiliary sound emitting layer and the piezoelectric excitation unit in an embodiment of the present application;

FIG. 9 is a schematic diagram showing the distribution of sound generating cavities according to an embodiment of the present application;

FIG. 10 is a second schematic diagram of the distribution of the sound generating cavities according to the embodiment of the present application;

FIG. 11 is a third schematic diagram of the distribution of the sound generating cavities according to the embodiment of the present application;

FIG. 12 is a diagram showing a distribution of sound emitting cavities according to an embodiment of the present application;

FIG. 13 is a fifth schematic diagram of the distribution of sound generating cavities according to an embodiment of the present application;

FIG. 14 is a schematic diagram illustrating an arrangement of a plurality of piezoelectric excitation units according to an embodiment of the present application;

FIG. 15 is a schematic diagram illustrating an exemplary connection between a piezoelectric excitation unit and a power supply according to an embodiment of the present application;

FIG. 16 is a schematic diagram illustrating another exemplary connection of a piezoelectric excitation unit to a power supply according to an embodiment of the present application;

FIG. 17 is a schematic diagram illustrating an exemplary connection of a plurality of piezoelectric excitation units in an embodiment of the application;

FIG. 18 is a schematic diagram illustrating another exemplary connection of a plurality of piezoelectric excitation units according to an embodiment of the present application;

FIG. 19 is a schematic diagram showing the position of the positive and negative electrodes of the piezoelectric excitation unit according to an embodiment of the present application;

FIG. 20 is a diagram showing the second position of the positive and negative electrodes of the piezoelectric excitation unit according to the embodiment of the present application.

Illustration of:

The device comprises a1 '-surface layer, a 2' -coloring layer, a 3 '-diffusion layer, a 4' -Fresnel lens layer, a 5 '-reflecting layer, a 6' -supporting structure, a 1-display functional layer, a 2-auxiliary sounding layer, a 21-first skin, a 22-second skin, a 23-middle layer, a 31-first sealing layer, a 32-second sealing layer, a 4-piezoelectric excitation unit, a 5-sounding cavity, a 6-bonding layer, a 7-frame, an 8-damping layer and a 9-suspension bracket.

Detailed Description

Reference will now be made in detail to the embodiments, examples of which are illustrated in the accompanying drawings. When the following description refers to the accompanying drawings, the same numbers in different drawings refer to the same or similar elements, unless otherwise indicated. The embodiments described in the examples below do not represent all embodiments consistent with the application. Merely exemplary of systems and methods consistent with aspects of the application as set forth in the claims.

It should be noted that the brief description of the terminology in the present application is for the purpose of facilitating understanding of the embodiments described below only and is not intended to limit the embodiments of the present application. Unless otherwise indicated, these terms should be construed in their ordinary and customary meaning.

The terms first, second, third and the like in the description and in the claims and in the above-described figures are used for distinguishing between similar or similar objects or entities and not necessarily for describing a particular sequential or chronological order, unless otherwise indicated. It is to be understood that the terms so used are interchangeable under appropriate circumstances.

The terms "comprises," "comprising," and "having," and any variations thereof, are intended to cover a non-exclusive inclusion, such that a product or apparatus that comprises a list of elements is not necessarily limited to all elements explicitly listed, but may include other elements not expressly listed or inherent to such product or apparatus.

The term "module" refers to any known or later developed hardware, software, firmware, artificial intelligence, fuzzy logic, or combination of hardware or/and software code that is capable of performing the function associated with that element.

The embodiment of the application can be applied to various types of projection devices. Hereinafter, a sound-emitting screen and a projection television will be described by taking projection electricity as an example. The projection television is a device capable of projecting images or videos on a screen, and the projection device can play corresponding video signals by being connected with a computer, a broadcasting network, the internet, a VCD (Video Compact Disc: video high-density optical disc), a DVD (DIGITAL VERSATILE DISC Recordable: digital video disc), a game machine, a DV and the like through different interfaces. Projection televisions are widely used in homes, offices, schools, entertainment venues, and the like.

Fig. 1 is a schematic layout diagram of a projection device according to an embodiment of the application.

In some embodiments, referring to fig. 1, a projection television is provided that includes a sound emitting screen and a projection device. The sounding screen is fixed on the first position, and the projection device is placed on the second position, so that the picture projected by the sounding screen is matched with the projection screen. The projection device comprises a laser light source, a light machine, a lens and a projection medium. The laser light source provides illumination for the optical machine, the optical machine modulates light beams of the light source, outputs the light beams to the lens for imaging, and projects the light beams to the projection medium to form a projection picture.

In some embodiments, the laser light source of the projection device includes a laser assembly and an optical lens assembly, and a light beam emitted from the laser assembly can penetrate the optical lens assembly to provide illumination for the optical machine. Wherein, for example, the optical lens assembly requires a higher level of environmental cleanliness, hermetic level of sealing; and the chamber for mounting the laser assembly can be sealed by adopting a dustproof grade with a lower sealing grade so as to reduce the sealing cost.

In some embodiments, the light engine of the projection device may include a heat dissipation system, a circuit control system, and the like. It should be noted that, in some embodiments, the light emitting component of the projector may also be implemented by an LED (LIGHT EMITTING Diode) light source.

In some embodiments, the laser light source in the projection device may include a blue laser, a red laser and a green laser that are independently disposed, and the projection device may also be referred to as a three-color projection device, where the blue laser, the red laser and the green laser are all module light (Mirai Console Loader, MCL) packaged lasers, which are small in size and facilitate compact arrangement of the optical paths.

In some embodiments, the projection device includes a controller including at least one of a central processing unit (Central Processing Unit, CPU), a video processor, an audio processor, a graphics processor (Graphics Processing Unit, GPU), RAM Random Access Memory, RAM), ROM (Read-Only Memory), first to nth interfaces for input/output, a communication Bus (Bus), and the like.

In some embodiments, the projection device may be configured with a camera for cooperating with the projection device to effect regulatory control of the projection process. For example, the camera of the projection device configuration may be embodied as a 3D camera, or a binocular camera; when the camera is implemented as a binocular camera, the camera specifically includes a left camera and a right camera; the binocular camera can acquire the corresponding curtain of the projection device, namely the image and the playing content presented by the projection surface, and the image or the playing content is projected by the built-in optical machine of the projection device.

When the projection device moves to a position, the projection angle and the projection plane distance of the projection device are changed, so that the projection image is deformed, and the projection image is displayed as a trapezoid image or other malformed images; the projection equipment controller can realize automatic trapezoid correction based on the image shot by the camera through coupling the included angle between the projection surfaces of the optical machine and the correct display of the projected image.

The projection television is an ultra-short focus projection display device, and comprises a projection device and a sounding screen matched with the projection device. The main components of the sounding screen are a display functional layer, an adhesive layer and a supporting structure, wherein the display functional layer consists of a light-resistant layer, a coloring layer, a diffusion layer, a Fresnel lens layer and an aluminum reflecting layer.

Fig. 2 is a schematic structural diagram of a sound emitting screen.

Referring to fig. 2, the display function layer sequentially includes, from the user viewing direction, i.e., from left to right in fig. 2: a surface layer 1', a coloring layer 2', a diffusing layer 3', a fresnel micro-lens layer 4', a reflecting layer 5 'and a support structure 6'. Light emitted by the projection device is refracted by the surface of the screen, enters the screen, is reflected by the Fresnel lens layer 4' (the back surface of the Fresnel lens layer is coated with an aluminum reflecting layer) and then exits from the screen, and finally enters human eyes to be passively developed.

In some embodiments, the sound production of the sound production screen is realized by combining an electromagnetic exciter with an auxiliary sound production layer. The sounding principle of the electromagnetic exciter is as follows: the electromagnetic exciter is attached to the auxiliary sounding layer, the electromagnetic exciter and the auxiliary sounding layer vibrate reversely under the action of the electromagnetic exciter, a vibrating cavity is formed in a space surrounded by the electromagnetic exciter and the auxiliary sounding layer, an air column in the vibrating cavity vibrates and transmits the vibration to the auxiliary sounding layer, vibration waves transmitted in the auxiliary sounding layer are transverse waves, and after the vibration waves are transmitted to the surface of the plate from an excitation source, the vibration waves are radiated out in longitudinal waves to form sound waves. Specifically, the auxiliary sounding layer may be a sounding substrate.

However, the structure of the electromagnetic exciter is complex, the volume is large, and the thickness of the sound screen is thick. If the reduction and weight reduction of the sound production screen are to be realized, a mode of reducing the thickness of the auxiliary sound production layer or the electromagnetic exciter is generally adopted, but the sound effect of the sound production screen is affected, for example, after the vibration reduction layer is removed, a machine vibration phenomenon occurs, noise is generated, and the sound effect is affected; after the auxiliary sounding layer is thinned, the strength is reduced, the flatness of the screen is reduced when the auxiliary sounding layer vibrates, image distortion is generated, and the display effect is affected; after the low-power electromagnetic exciter is adopted, the sound effect is affected due to insufficient power.

Accordingly, some embodiments of the present application provide a sound emitting screen, referring to fig. 3 and 4, which may include a display function layer 1, an auxiliary sound emitting layer 2, and a plurality of piezoelectric excitation units 4.

The display functional layer 1 comprises a diaphragm, and the diaphragm and the auxiliary sounding layer 2 are attached to form a composite diaphragm structure to serve as a diaphragm of the piezoelectric excitation unit 4. The piezoelectric excitation unit 4 drives the diaphragm and the vibrating diaphragm structure formed by the auxiliary sounding layer 2 to vibrate integrally so as to realize sounding of the sounding screen.

The film of the display functional layer 1 can be a spectrum selective spray coating, a solid film (such as a layer of cloth) or an optical film of the display functional layer 1. That is, in some embodiments, the film may be a structure of an optical film of the display function layer 1, and the display function layer 1 may be passively developed according to the principles of refraction and reflection. The display function layer 1 is used for displaying projection pictures, and the projection equipment is used for projecting the video pictures to be projected to the sounding screen, so that a user can directly see the same video resources played by the electronic display screen (such as a television, a liquid crystal display, a mobile phone and the like) from the display function layer 1. The auxiliary sounding layer 2 is used for sounding, and when a user performs visual appreciation through the display function layer 1, the auxiliary sounding layer 2 provides hearing experience for the user.

In the embodiment of the present application, the piezoelectric excitation unit 4 is a device including a piezoelectric material, and the piezoelectric material is a material capable of mutually converting mechanical energy and electric energy. The piezoelectric excitation unit 4 can be connected with a power supply through a voltage converter or a power amplifier converter, an electric field is applied to the piezoelectric excitation unit 4, and when the piezoelectric excitation unit 4 works, the piezoelectric excitation unit 4 drives the vibrating diaphragm structure formed by the display function layer 1 and the auxiliary sounding layer 2 to vibrate integrally so as to realize sounding of the sounding screen.

In some embodiments, the piezoelectric excitation unit 4 adopts a piezoelectric ceramic plate, and the piezoelectric ceramic plate is used as a structural member, so that the piezoelectric ceramic plate has the advantages of light weight, small amplitude and vibration in the same direction as the vibrating diaphragm, and therefore, the piezoelectric ceramic plate is applied to a plate type screen, and the amplitude and the arrangement structure are not required to be limited for fixing, so that the structural simplification and the weight reduction of the sounding screen can be realized.

The piezoelectric excitation unit 4 (e.g., piezoelectric ceramic sheet) is characterized in that when the number of piezoelectric ceramic layers is small and the overall thickness is small, the sounding frequency band is narrow and biased to high frequency, whereas when the number of piezoelectric ceramic layers is large, the sounding frequency band can be widened and biased to low frequency. Therefore, the frequency band can be widened by combining piezoelectric ceramics with different layers.

However, by combining piezoelectric ceramics with different layers, although the frequency band can be widened, the loudness of part of the frequency bands is lower, and at the moment, the cavity is arranged for the frequency bands so as to realize the improvement of the loudness, thereby obtaining the target frequency response curve. Therefore, the auxiliary sounding layer 2 is provided with a plurality of sounding cavities 5, the sizes of the sounding cavities 5 are the same, a plurality of piezoelectric excitation units 4 are respectively arranged in the sounding cavities 5, the specifications of the piezoelectric excitation units 4 are the same, the piezoelectric excitation units 4 are matched with the sounding cavities 5 to form unit diaphragms, and sounding frequency bands of the unit diaphragms at different positions are different.

The piezoelectric excitation unit 4 is located in the sounding cavity 5, and the piezoelectric excitation unit 4 drives the vibrating diaphragm attached to the piezoelectric excitation unit to vibrate, so that air in the cavity is pushed to vibrate. When a plurality of sound generating cavities 5 are arranged on the auxiliary sound generating layer 2, the plurality of sound generating cavities 5 are cavities with the same specifications and arranged in the auxiliary sound generating layer 2, and the same type of piezoelectric excitation units 4 are arranged in the plurality of sound generating cavities 5. The piezoelectric excitation units 4 are attached to the vibrating diaphragm at the sound generating cavity 5, and can generate vibration with the same amplitude to respectively push air columns in the cavities to vibrate. Because the distribution of the degree of freedom of the screen is different, such as a membrane, the elasticity in the middle is best, and the vibration amplitude is the largest, so that the vibration amplitudes of different areas of the screen are different, the sounding frequency bands of different areas are different, and the cavity is located in different sounding frequency bands at the moment, so that the loudness of the corresponding frequency bands can be improved.

In some embodiments, the plurality of piezoelectric excitation units 4 are respectively disposed on one side, close to the display functional layer 1, of the plurality of sound emission cavities 5, or the plurality of piezoelectric excitation units 4 are respectively disposed on one side, far away from the display functional layer 1, of the plurality of sound emission cavities 5, the piezoelectric excitation units 4 are matched with the sound emission cavities 5 to form unit diaphragms to independently emit sound, and the sum of sound emission frequencies of the plurality of unit diaphragms forms a preset frequency response.

Referring to fig. 4, the piezoelectric excitation unit 4 is combined with the auxiliary sounding layer 2 in a sounding structure composed of the piezoelectric excitation unit 4 and the sounding cavity 5 on the auxiliary sounding layer 2. A plurality of sound generating cavities 5 are arranged on the auxiliary sound generating layer 2. The piezoelectric excitation unit 4 is arranged in the sounding cavity 5, the piezoelectric excitation unit 4 and the sounding cavity 5 form a resonant cavity, and the air column inside the sounding cavity vibrates to promote the loudness of the corresponding frequency band, so that the bass effect of the sounding screen is effectively improved. And when the piezoelectric excitation units 4 work, the display function layer 1 and the vibrating diaphragm structure formed by the auxiliary sounding layer 2 are driven to vibrate integrally. And because the piezoelectric excitation units 4 can produce different vibration effects in the sounding cavity 5 at different positions, each piezoelectric excitation unit 4 is matched with the sounding cavity 5 to form a unit vibrating diaphragm, the whole vibrating diaphragm is formed by a plurality of unit vibrating diaphragms, the whole vibrating diaphragm independently sounds through each unit vibrating diaphragm, the sum of the unit vibrating diaphragms forms a required frequency response, and sounding loudness of the sounding screen is effectively improved.

The piezoelectric excitation unit 4 has different vibration transmission effects at different positions in the sound generating cavity 5. That is, if the piezoelectric excitation unit 4 is disposed on the side of the sound generating cavity 5 near the display function layer 1, when the piezoelectric excitation unit 4 generates vibration, the vibration sound wave will be transmitted to the auxiliary sound generating layer 2 through the side of the sound generating cavity 5 near the display function layer 1, so that the auxiliary sound generating layer 2 and the piezoelectric excitation unit 4 vibrate in the same direction in time, and the sound response effect is improved. And the vibration propagation direction of the whole sounding screen faces to the radiation propagation of the viewer and is accepted by the viewer. The propagation direction of the vibration generated by the auxiliary sounding layer 2 and the display functional layer 1 as the vibrating diaphragm is also facing to the viewer. When the piezoelectric excitation unit 4 is arranged on one side of the sound generating cavity 5, which is close to the display function layer 2, the first propagation direction of vibration generated by the air column in the sound generating cavity 5 is far away from a viewer, and the propagation direction is changed after the vibration is reflected by the sealing layer or the shell of the piezoelectric excitation unit 4. The sealing layer or the shell of the piezoelectric excitation unit 4 can play a role in interference of sound waves, absorb noise and improve sound quality. By selecting and designing the material and structure of the sealing layer or the shell of the piezoelectric excitation unit 4, the noise with different wavelengths can be absorbed and eliminated.

And if the piezoelectric excitation unit 4 is arranged on one side of the sound generating cavity 5 far away from the display function layer 1, the auxiliary sound generating layer 2 is far away from the vibrating diaphragm on one side of the display function layer 1 through the sound generating cavity 5 or is conducted to the auxiliary sound generating layer 2 through an air column between the auxiliary sound generating layer 2 and the piezoelectric excitation unit 4, and in the conducting process, a resonance effect can be generated, and the tone quality is improved. And when the auxiliary sounding layer 2 and the display functional layer 1 are used as vibrating films to realize sounding, the air column in the sounding cavity 5 vibrates under the action of the piezoelectric excitation unit 4. The presence of the air column corresponds to adding a load to the diaphragm to increase the sound intensity.

In some embodiments, the piezoelectric excitation unit 4 may be installed at a middle position in the sounding cavity 5, and the connection manner between the piezoelectric excitation unit 4 and the sounding cavity 5 may be a bracket, an adhesive, or the like, and when the bracket is used for connection, a damping layer needs to be added, and this connection manner may form a dual-resonance cavity, so as to achieve an effect of improving loudness.

In some embodiments, the auxiliary sound emitting layer 2 includes a first skin layer 21, a second skin layer 22, and an intermediate layer 23; the intermediate layer 23 includes a honeycomb core composed of a plurality of unit cells, and the first skin layer 21 and the second skin layer 22 are respectively laminated on both ends of the intermediate layer 23.

By way of example, the auxiliary sound layer 2 in the sound screen may include: plate-shaped aluminum honeycomb core layer and glass fiber composite material skins positioned on two sides of the aluminum honeycomb core layer. The glass fiber composite material skin at the side close to the display function layer 1 is adhered to the display function layer 1 through the adhesive layer 6. When the piezoelectric excitation unit 4 positioned in the sound generating cavity 5 works, as the aluminum honeycomb core layer exists in the auxiliary sound generating layer 2, sound generated by driving the auxiliary sound generating layer 2 to vibrate by the piezoelectric excitation unit 4 is in a multi-mode on the whole surface of the auxiliary sound generating layer 2, so that the auxiliary sound generating layer 2 can vibrate together in a plurality of positions with the surface as a whole, and the front surface of the auxiliary sound generating layer 2 can generate sound.

In some embodiments, the first skin layer 21, the second skin layer 22 may also be an aluminum skin, a carbon fiber composite skin, a glass fiber/carbon fiber composite skin, or the like.

Referring to fig. 5 and 6, fig. 5 is one of left side views of the installation relationship between the auxiliary sound emitting layer and the piezoelectric excitation unit provided by the embodiment of the present application, and fig. 6 is the second left side view of the installation relationship between the auxiliary sound emitting layer and the piezoelectric excitation unit provided by the embodiment of the present application.

A groove is arranged on one surface of the auxiliary sounding layer 2, which is far away from the display functional layer; a first sealing layer 31 is arranged on the side cover of the groove far away from the display function layer 2, and the first sealing layer 31 and the groove form the sound emitting cavity 5.

The plurality of piezoelectric excitation units 4 are respectively disposed in the plurality of grooves, and the piezoelectric excitation units 4 may be disposed on a side of the grooves close to the display function layer 1, or the piezoelectric excitation units 4 may be disposed on a side of the grooves away from the display function layer 1. The first sealing layer 31 is covered on one side of the groove far away from the display functional layer 1, so that the piezoelectric excitation unit 4, the groove and the first sealing layer 31 form a resonant cavity, the loudness of a corresponding frequency band is improved by the vibration of an air column in the resonant cavity, the vibration on the piezoelectric excitation unit can be improved, the vibration efficiency of the auxiliary sounding layer is improved, and the bass effect of the sounding screen is effectively improved. The vibration mode is that the piezoelectric excitation unit 4 drives the auxiliary sounding layer 2 to vibrate firstly, and then the vibration is transmitted to the display functional layer 1, so that the integral vibration of the vibrating diaphragm structure is realized.

By way of example, the auxiliary sound-emitting layer 2 in the sound-emitting screen may include an intermediate layer 23, and a first skin layer 21 (near the display function layer 1) and a second skin layer 22 (far from the display function layer 1) on both sides of the intermediate layer. The auxiliary sounding layer 2 is embedded to be equipped with a plurality of recesses in the one side that keeps away from the demonstration function layer 1. The plurality of piezoelectric excitation units 4 are disposed in the plurality of grooves, the piezoelectric excitation units 4 may be disposed on a side of the grooves close to the display function layer 1, the bottom of the piezoelectric excitation units 4 is connected with the second skin layer 22 of the auxiliary sound generation layer 2, or the piezoelectric excitation units 4 may be disposed on a side of the grooves far from the display function layer 1, and the bottom of the piezoelectric excitation units 4 is connected with the first sealing layer 31.

When the bottom of the piezoelectric excitation unit 4 is connected with the second skin layer 22 of the auxiliary sounding layer 2, the piezoelectric excitation unit 4 drives the cavity wall of the sounding cavity 5 attached to the piezoelectric excitation unit to vibrate in the same direction, then drives the second skin layer 22 to vibrate, and the second skin layer 22 vibrates to push the auxiliary sounding layer 2 to vibrate integrally, and then the vibration is transmitted to the display functional layer 1 to realize the vibration of the vibrating diaphragm structure integrally. When the bottom of the piezoelectric excitation unit 4 is connected with the first sealing layer 31, the piezoelectric excitation unit 4 drives the cavity wall of the sound producing cavity 5 attached to the piezoelectric excitation unit to vibrate in the same direction, then drives the first sealing layer 31 to vibrate, and the first sealing layer 31 vibrates to drive the second skin layer 22 to vibrate, so that the auxiliary sound producing layer 2 is pushed to vibrate integrally, and then the vibration is transmitted to the display functional layer 1, so that the vibration of the whole vibrating diaphragm structure is realized.

In this embodiment, a plurality of resonance cavities are formed by matching a plurality of piezoelectric excitation units 4 with a plurality of grooves, and sound is emitted by air column vibration inside the cavities, so that bass effect and sounding loudness are improved. The sound amplifying function of the cavity is similar to that of the resonance cavity, the frequency of sound is not changed, but the sound can be amplified through the resonance function, and therefore the effect of increasing the low-frequency sound intensity is achieved. The sound effect brought by different depths of the grooves is different, and the diversity of the sound effect can be realized by arranging the grooves with different depths to be matched with the piezoelectric excitation unit.

In some embodiments, the depth of the grooves is 1/4-4/3 of the thickness of the auxiliary sound emitting layer 2.

The shape of the recess may be set according to the shape of the piezoelectric excitation unit 4, or may be designed according to acoustic design requirements. By way of example, the grooves may be square grooves, circular grooves, hexagonal grooves, or the like, as embodiments of the application are not limited in this regard.

In some embodiments, the sound emitting screen further comprises an adhesive layer 6, the adhesive layer 6 being located between the auxiliary sound emitting layer 2 and the display function layer 1. The adhesive layer 6 may adhere the auxiliary sounding layer 2 and the display function layer 1 so that the auxiliary sounding layer 2 and the display function layer 1 form a diaphragm structure. The auxiliary sounding layer 2 and the display functional layer 1 are tightly connected in a face bonding mode to form a vibrating diaphragm structure, when the piezoelectric excitation unit 4 positioned in the sounding cavity 5 works, the piezoelectric excitation unit 4 drives the vibrating diaphragm structure to vibrate integrally, the auxiliary sounding layer 2 cannot collide with the display functional layer 1 to generate noise, and the sounding effect of the sounding screen is improved.

Referring to fig. 7 and 8, fig. 7 is a third left view of the installation relationship between the auxiliary sounding layer and the piezoelectric excitation unit provided by the embodiment of the present application, and fig. 8 is a fourth left view of the installation relationship between the auxiliary sounding layer and the piezoelectric excitation unit provided by the embodiment of the present application, where the sounding screen is adjusted based on the auxiliary sounding layer shown in fig. 5 and 6.

The auxiliary sounding layer 2 is provided with a through hole; the depth direction of the through hole is parallel to the thickness direction of the auxiliary sounding layer 2, a second sealing layer 32 is covered on one side of the through hole far away from the display function layer 1, and the through hole and the second sealing layer 32 form the sounding cavity 5.

The plurality of piezoelectric excitation units 4 are respectively provided in the plurality of through holes, and the piezoelectric excitation units 4 may be provided on a side of the through holes close to the display function layer 1, or the piezoelectric excitation units 4 may be provided on a side of the through holes away from the display function layer 1. The second sealing layer 32 is arranged on one side of the through hole far away from the display functional layer 1, so that the piezoelectric excitation unit 4, the through hole and the second sealing layer 32 form a resonant cavity, the air column inside the resonant cavity vibrates to promote the loudness of the corresponding frequency band, the resonant cavity can improve the vibration on the piezoelectric excitation unit 4, the vibration efficiency of the auxiliary sounding layer 2 is promoted, and the bass effect of the sounding screen is effectively improved. The piezoelectric excitation unit 4 drives the display function layer 1 to vibrate, and then the vibration is transmitted to the auxiliary sounding layer 2, so that the integral vibration of the vibrating diaphragm structure is realized.

By way of example, the auxiliary sound-emitting layer 2 in the sound-emitting screen may include an intermediate layer 23, and a first skin layer 21 (near the display function layer 1) and a second skin layer 22 (far from the display function layer 1) on both sides of the intermediate layer. The auxiliary sounding layer 2 is provided with a plurality of through holes parallel to the thickness direction of the auxiliary sounding layer 2. The plurality of piezoelectric excitation units 4 are provided in the plurality of through holes, the piezoelectric excitation units 4 may be provided at a side of the through holes close to the display function layer 1, the bottom of the piezoelectric excitation units 4 is connected with the adhesive layer 6 at a side of the display function layer 1, or the piezoelectric excitation units 4 may be provided at a side of the through holes away from the display function layer 1, and the bottom of the piezoelectric excitation units 4 is connected with the second sealing layer 32.

When the bottom of the piezoelectric excitation unit 4 is connected with the bonding layer 6 on one side of the display functional layer 1, the piezoelectric excitation unit 4 drives the cavity wall of the sounding cavity 5 attached to the piezoelectric excitation unit to vibrate in the same direction, then drives the bonding layer 6 on one side of the display functional layer 1 to vibrate, the bonding layer 6 pushes the display functional layer 1 to vibrate integrally, and then the vibration is transmitted to the auxiliary sounding layer 2, so that the vibration film structure vibrates integrally. The bottom of the piezoelectric excitation unit 4 is connected to the second sealing layer 32. When the piezoelectric excitation unit 4 works, the cavity wall of the sounding cavity 5 attached to the piezoelectric excitation unit is driven to vibrate in the same direction, then the second sealing layer 32 is driven to vibrate, the second sealing layer 32 vibrates to drive the second skin layer 22 to vibrate, so that the auxiliary sounding layer 2 is pushed to vibrate integrally, and then vibration is transmitted to the display functional layer 1, and the vibration of the vibrating diaphragm structure is realized integrally.

The shape of the through hole may be set according to the shape of the piezoelectric excitation unit 4, or may be designed according to acoustic design requirements. By way of example, the via may be a square via, a circular via, a hexagonal via, or the like, as embodiments of the application are not limited in this regard.

In summary, the two exemplary auxiliary sounding layers are sounding structures formed by the piezoelectric excitation unit 4 and the sounding cavity 5 embedded in the auxiliary sounding layer 2, and the sounding cavity 5 is a groove (partially penetrating) or a through hole (fully penetrating) in the auxiliary sounding layer 2. The piezoelectric excitation unit 4, the sounding cavity 5 and the sealing layer (the first sealing layer 31 or the second sealing layer 32) form a resonant cavity, and the loudness of the corresponding frequency band is improved through air column vibration in the cavity, so that the bass effect and sounding loudness of the sounding screen are improved. In addition, the sounding cavity 5 combines the piezoelectric excitation unit 4 with the auxiliary sounding layer 2, and the piezoelectric excitation unit 4 is arranged in the auxiliary sounding layer 2 through the sounding cavity 5 instead of independently placing the piezoelectric excitation unit 4 outside the auxiliary sounding layer 2, so that the thickness of the sounding screen can be further reduced. Because the thickness of the sounding screen is reduced by the mode of thinning the auxiliary sounding layer 2, and the area of the embedded sounding cavity 5 is smaller than that of the whole sounding screen, the strength of the whole backboard of the sounding screen can be ensured, the flatness of the screen is ensured during vibration, and the problem of image distortion is avoided.

In some embodiments, the sound emitting cavity 5 may also be a cell in a honeycomb core structure in the intermediate layer 23, in which case the sealing layer may be the first skin 21 or the second skin 22.

When the piezoelectric excitation unit 4 is disposed between the first skin 21 and the honeycomb core structure, the piezoelectric excitation unit 4, the second skin 22, and the cell form the sound emitting cavity 5. When the piezoelectric excitation unit 4 vibrates, the air column in the cell is driven to vibrate, and the vibration is transmitted to the second skin 22 to realize the vibration of the whole sound generating cavity 5, so that sound generation is realized.

When the piezoelectric excitation unit 4 is disposed between the second skin 22 and the honeycomb core structure, the piezoelectric excitation unit 4, the first skin 21, and the honeycomb core structure in the intermediate layer form the sound emitting cavity 5. When the piezoelectric excitation unit 4 vibrates, the air column in the cell is driven to vibrate, and the vibration is transmitted to the first skin 21 to realize vibration of the whole sound generating cavity 5, so that sound generation is realized.

Because the auxiliary sounding layer 2 has high degree of freedom when vibrating relative to the middle position of the sounding screen, the vibration amplitude generated by the vibration is large, and the sounding layer corresponds to low-frequency sounding; the auxiliary sounding layer 2 has low degree of freedom when vibrating relative to the edge position of the sounding screen, and the vibration amplitude is small and corresponds to high-frequency sounding. Therefore, the loudness of the high frequency band can be raised when the sound emitting cavity 5 is disposed near the edge position, and the loudness of the low frequency band can be raised when the sound emitting cavity 5 is disposed near the middle region. Accordingly, in the embodiment of the present application, the sounding cavities 5 disposed on the auxiliary sounding layer 2 may include various situations, and are respectively illustrated below.

Example 1

The plurality of sound generating cavities 5 are all arranged at the middle position of the auxiliary sound generating layer 2, namely, all the sound generating cavities 5 are concentrated at the middle position of the auxiliary sound generating layer 2, and vibration sound waves with larger amplitude are generated in the middle area through the plurality of sound generating cavities 5, so that the loudness of a low frequency range is improved.

For example, as shown in fig. 9, the sounding screen includes 3 sounding cavities 5 in total, and the 3 sounding cavities 5 are arranged in a linear array in a region corresponding to the centerline of the auxiliary sounding layer 2. Each sound generating cavity 5 is provided with a piezoelectric ceramic piece, namely the sound generating cavity 5 comprises 3 piezoelectric ceramic pieces, the specifications of the 3 piezoelectric ceramic pieces are the same, the 3 piezoelectric ceramic pieces are adhered to the second skin 22 of the auxiliary sound generating layer 2, and the powers of the 3 piezoelectric ceramic pieces are the same. Therefore, the sounding screen can vibrate and sound through the 3 piezoelectric ceramic plates, and the loudness is improved through the 3 sounding cavities 5. Because the sound emitting cavity 5 is located in the middle area of the auxiliary sound emitting layer 2, vibration sound waves with larger amplitude can be generated, and the loudness of the low frequency range is improved.

It should be noted that, the middle area of the auxiliary sounding layer 2 may be the middle of the whole sounding screen, or may partition the sounding screen, where each partition is middle, that is, a plurality of sounding areas are set on the auxiliary sounding layer 2, and a plurality of sounding cavities 5 are respectively set at the middle positions of the sounding partitions, for example, as shown in fig. 10, the sounding screen includes 2 sounding cavities 5 altogether, and the 2 sounding partitions are divided by taking the central line of the auxiliary sounding layer 2 as a boundary line, and the 2 sounding cavities 5 are respectively located at the middle positions of the 2 sounding partitions.

Example two

The plurality of sound generating cavities 5 are all arranged at the edge position of the auxiliary sound generating layer 2, namely, all the sound generating cavities 5 are concentrated at the edge position of the auxiliary sound generating layer 2, and vibration sound waves with smaller amplitude are generated in the edge region, so that the loudness of a high-frequency range is improved.

For example, as shown in fig. 11, the sounding screen includes 6 sounding cavities 5 in total, and 6 grooves are correspondingly formed in the auxiliary sounding layer 2, and the 6 grooves are respectively located at positions, close to four corners, of the auxiliary sounding layer 2, i.e. the sounding cavities 5 are located in edge regions of the auxiliary sounding layer 2. 4 piezoelectric ceramic plates are arranged in each sound generating cavity 5, the specifications of the 4 piezoelectric ceramic plates are the same, the 4 piezoelectric ceramic plates are adhered to the bottom of the groove of the auxiliary sound generating layer 2, and the power of the piezoelectric ceramic plates is the same. At this time, after the piezoelectric ceramic piece is electrified and deformed, vibration sound waves can be generated in the sound generating cavity 5 of the edge area of the auxiliary sound generating layer 2, and the vibration sound waves with smaller amplitude can be generated because the sound generating cavity 5 is positioned in the edge area of the auxiliary sound generating layer 2, so that the loudness of a high-frequency range is improved.

It should be noted that, the edge area of the auxiliary sounding layer 2 may be an edge of the whole sounding screen, or may be a partition of the sounding screen, and the edge of each partition, that is, a plurality of sounding areas are set on the auxiliary sounding layer 2, and a plurality of sounding cavities 5 are respectively set at edge positions of the sounding partitions, for example, as shown in fig. 12, the sounding screen includes 4 sounding cavities 5 altogether, so that 2 sounding partitions are divided by taking a central line of the auxiliary sounding layer 2 as a boundary line, and the 4 sounding cavities 5 are respectively located at edge positions of the 2 sounding partitions.

Example III

The sounding cavities 5 are all arranged at the middle position and the edge position of the auxiliary sounding layer 2, namely, the sounding cavities 5 are arranged at the middle region and the edge region of the auxiliary sounding layer 2, the sounding cavities 5 in the middle region can promote the loudness of the low frequency band, and meanwhile, the sounding cavities 5 in the edge region can promote the loudness of the high frequency band. Therefore, the loudness can be improved by both low frequency and high frequency, so that the frequency range is widened.

For example, as shown in fig. 13, the sounding screen includes 9 sounding cavities 5 in total, and correspondingly, 9 through holes are formed in the auxiliary sounding layer 2, and the 9 through holes are uniformly distributed on the auxiliary sounding layer 2, i.e. the 9 sounding cavities 5 are located in the middle area and the edge area of the auxiliary sounding layer 2.4 piezoelectric ceramic plates are arranged in each sound generating cavity 5, the specifications of the 4 piezoelectric ceramic plates are the same, the 4 piezoelectric ceramic plates are adhered to the second sealing layer 32 which is covered on the through hole of the auxiliary sound generating layer 2, and the powers of the piezoelectric ceramic plates are the same. Because the sounding cavity 5 is located in the middle area and the edge area of the auxiliary sounding layer 2, the sounding cavity 5 located in the middle area can promote the loudness of the low frequency band, and meanwhile the sounding cavity 5 located in the edge area can promote the loudness of the high frequency band, so that the loudness of the low frequency band and the high frequency end are promoted.

In the embodiment of the application, a plurality of sounding cavities 5 with the same size and the same depth are arranged on the auxiliary sounding layer 2, a plurality of piezoelectric excitation units 4 are respectively arranged in the same positions of the sounding cavities 5, and the materials and the sizes of the piezoelectric excitation units 4 are equal. Each piezoelectric excitation unit 4 is matched with the sounding cavity 5 to form a plurality of unit vibrating diaphragms during operation, each unit vibrating diaphragm independently sounds (the sound effect of sounding of each unit vibrating diaphragm is the same), the vibrating diaphragm structure consisting of the auxiliary sounding layer 2 and the display functional layer 1 is driven to vibrate, the sounding frequency sum of the plurality of unit vibrating diaphragms forms a required frequency response, and sounding loudness is increased through superposition of the plurality of sounding cavities 5.

It should be noted that, the number of the sounding cavities 5 can be set according to the size of the sounding screen, and the sounding cavities 5 are distributed on the whole auxiliary sounding layer 2 to realize full-screen sounding. The embodiment of the present application is not limited thereto.

In some embodiments, the number of piezoelectric excitation units 4 may be 4, 6, 8, etc. The plurality of sound emitting cavities 5 corresponding to the first sound emitting cavities can be uniformly arranged, alternately arranged, arranged according to layers and the like on the auxiliary sound emitting layer 2. By changing the arrangement mode of the plurality of sounding cavities 5 on the auxiliary sounding layer 2, the sounding loudness of the sounding screen can be changed.

For example, referring to fig. 14, the number of the piezoelectric excitation units 4 is 6, the arrangement mode of the 6 sound-emitting cavities corresponding to the piezoelectric excitation units on the auxiliary sound-emitting layer 2 is that the piezoelectric excitation units are arranged in layers, the top to the bottom on the auxiliary sound-emitting layer 2 is divided into three layers, 2 sound-emitting cavities 5 are symmetrically arranged on each layer, and the 6 piezoelectric excitation units 4 are respectively arranged in the 6 sound-emitting cavities 5.

Compared with the single sound-emitting cavity 5, the single sound-emitting cavity 5 mainly plays a role in enhancing loudness, and the structure of the plurality of sound-emitting cavities 5 in the embodiment of the application can enable the whole vibrating diaphragm to form a combined set of unit vibrating diaphragms with various vibration modes through the cooperation of the piezoelectric excitation unit 4 and the sound-emitting cavities 5.

In some embodiments, when the piezoelectric excitation unit 4 is operated, the piezoelectric excitation unit 4 tends to drive the sealing layer (the first sealing layer 31 or the second sealing layer 32) to vibrate, and the sealing layer in the vibration state often collides with the auxiliary sound generating layer 2 to generate noise, and the noise directly affects the sound generating effect of the sound generating screen. Therefore, the sound emitting screen further includes a damper sheet disposed between the sealing layer and the auxiliary sound emitting layer 2. The rigid contact between the sealing layer and the auxiliary sounding layer 2 is avoided, so that the problem of noise generated by collision between the sealing layer and the auxiliary sounding layer 2 is avoided, or the volume of the generated noise is reduced, and the sounding effect of the sounding screen is improved.

In some embodiments, the material of the shock absorbing sheet may be shock absorbing foam or shock absorbing rubber, etc.

In some embodiments, the piezoelectric excitation unit 4 and the second skin layer 22 and the sealing layer (the first sealing layer 31 or the second sealing layer 32) may be tightly bonded or non-tightly bonded, and only the connection point between the piezoelectric excitation unit 4 and the second skin layer 22 and the sealing layer is required to be formed, so that the higher the degree of tightness of the bonding is, the less noise is generated during vibration, the piezoelectric excitation unit can be tightly bonded on the skin layer or the sealing layer, and the sound effect is improved.

Alternatively, the material of the sealing layer may be consistent with the material of the second skin layer 22, or may be inconsistent with the material of the second skin layer 22, and when inconsistent with the material of the second skin layer 22, the material of the sealing layer may be a metal sheet, a plastic sheet, a kraft paper sheet, or the like. The connection mode of the sealing layer and the auxiliary sounding layer 2 can be screw connection, double faced adhesive tape connection, magnetic lamination and the like.

In some embodiments, referring to fig. 3, the sound emitting screen further includes a bezel 7, and the bezel 7 is circumferentially disposed at the outer peripheral portions of the display function layer 1 and the auxiliary sound emitting layer 2. For example, the frame 7 may be a generally annular frame body matching the shape of the diaphragm structure formed by the display functional layer 1 and the auxiliary sound generating layer 2, and the thickness of the frame 7 is greater than or equal to the sum of the thicknesses of the display functional layer 1, the auxiliary sound generating layer 2, the adhesive layer 6 and the sealing layer. May surround the outer peripheral portions of the display function layer 1 and the auxiliary sound generation layer 2. The frame 7 can protect the display function layer 1 and the auxiliary sounding layer 2 from damage of the external environment on the outer peripheral portions of the display function layer 1 and the auxiliary sounding layer 2. And the integral structure of the sounding screen can be enhanced, and the firm effect is improved.

Optionally, the material of the frame 7 includes at least one of plastic, metal, and the like.

In some embodiments, referring to fig. 3, the sound emitting screen further includes a shock absorbing layer 8, and the shock absorbing layer 8 is located between the bezel 7 and the outer peripheral portions of the display function layer 1 and the auxiliary sound emitting layer 2. When the piezoelectric excitation unit 4 works, the piezoelectric excitation unit 4 drives the auxiliary sounding layer 2 to vibrate, and then the vibration is transmitted to the display functional layer 1, so that the vibration of the whole vibrating diaphragm is realized. At this time, the outer peripheral parts of the display function layer 1 and the auxiliary sounding layer 2 may collide and rub with the frame 7, and thus the contact parts of the display function layer 1 and the auxiliary sounding layer 2 with the frame 7 may be damaged, so that the shock-absorbing layer 8 may be arranged between the outer peripheral parts of the display function layer 1 and the auxiliary sounding layer 2 and the frame 7, so as to protect the outer peripheral parts of the display function layer 1 and the auxiliary sounding layer 2, and improve the service life of the sounding screen.

Optionally, the shock absorbing layer 8 includes at least one of various damping materials such as butyl rubber, polyurethane foam, polyvinyl chloride, and epoxy resin.

In some embodiments, referring to fig. 3, the sound emitting screen further includes a hanging bracket 9 connected to a side of the bezel 7 remote from the display function layer 1 and the outer peripheral portion of the auxiliary sound emitting layer 2. Wherein, a damping structure is arranged between the suspension bracket 9 and the frame 7. The suspension bracket is provided with a screw, and the suspension bracket can be fixed on a wall through the screw, so that the display function layer 1, the auxiliary sounding layer 2 and the piezoelectric excitation units 4 in the sounding cavities 5 on the auxiliary sounding layer 2 can be fixed on the wall, that is, the sounding screen is fixed on the wall.

In some embodiments, the plurality of piezoelectric excitation units 4 are connected in series, parallel, series-parallel, or the like. An electric field is applied to the piezoelectric material, and electric energy is converted into mechanical deformation through an inverse voltage effect, so that vibration sounding is realized. Referring to fig. 15, 16, 17 and 18, fig. 15 and 16 are two exemplary connection manners of the piezoelectric excitation unit 4 and the power source, and fig. 17 and 18 are two exemplary connection manners of the plurality of piezoelectric excitation units, and voltage and signals are input to the voltage converter or the power amplifier converter to apply an electric field to the plurality of piezoelectric excitation units 4.

In some embodiments, the single piezoelectric excitation unit 4 is composed of multiple layers of ceramics and positive and negative electrode pins, the thickness and the material of each layer of ceramics can be the same or different, the positions of the positive and negative electrodes can be the same or different, the coverage area of the positive and negative electrodes of each piece of ceramic material can be the same or different, and the connection mode of the internal multiple layers of ceramics can be the same or different. The overall shape of the piezoelectric excitation unit 4 may be circular, rectangular, square, irregular, etc., and the shape of each layer of the piezoelectric ceramic material may be circular, rectangular, square, irregular, etc. For example, referring to fig. 19 and 20, the piezoelectric excitation unit 4 has a rectangular overall shape, and the positions of the positive and negative electrodes, the coverage area, and the like thereof may be set as shown in fig. 19 and 20. The natural frequency of the piezoelectric excitation unit 4 is related to the material, the area, the layer number and the internal connection mode. When the characteristics of the diaphragms are the same, but the natural frequencies of the piezoelectric excitation units 4 are different, the formed integral vibration frequencies are also different, and different sound effects are further realized.

Because the electromagnetic exciter has large weight and a vibration cavity is formed between the electromagnetic exciter and the auxiliary sounding layer, only the strength of the plate type screen can be supported, and the common frame type screen is light and thin to synthesize, so that the weight of the electromagnetic exciter is difficult to support. The auxiliary sound-emitting layer 2 is a rigid material with a honeycomb structure inside, the support structure of the inner honeycomb core being perpendicular to the skin surface. When internal transverse waves are transmitted, if larger amplitude is needed, fatigue of a glued part of the honeycomb structure and the skin can be caused, so that the panel screen is easily damaged, and therefore, the application scene of the electromagnetic exciter is limited and the screen is easily damaged.

Compared with the structure of the electromagnetic exciter, the piezoelectric ceramic has the characteristics of light weight and thin thickness, and the sounding principle is that the piezoelectric ceramic is attached to the auxiliary sounding layer, and the piezoelectric ceramic deforms along the direction vertical to the plane of the ceramic plane after being electrified, so that the auxiliary sounding layer 2 is driven to vibrate in the same direction. The bonding mode of the piezoelectric ceramic and the auxiliary sounding layer 2 can be close bonding or non-close bonding, only the connection point is formed between the piezoelectric ceramic and the auxiliary sounding layer 2, the bonding degree is related to the formed noise, and the more close the bonding is, the less noise is. Through combining piezoceramics ware and sound production screen, realize the multimode sound production screen, effectively reduce the thickness of sound production screen, improve the bass effect of sound production screen.

It is noted that, since the piezoelectric ceramic plate is limited by the process technology, the sounding frequency band is narrower, and most piezoelectric ceramic plates are used as buzzers. Therefore, in some embodiments, the sheet-shaped piezoelectric ceramic material is not a piezoelectric ceramic sheet, but is made of a multilayer ceramic structure, a piezoelectric ceramic low-temperature sintering technology and other technologies, the sounding frequency band is expanded, the piezoelectric ceramic and the metal can be welded or integrally formed, the preparation technology is simple, the technological conditions and requirements are correspondingly reduced, and the production cost can be saved while the sounding effect is improved. The piezoelectric ceramic sounding screen is combined with the sounding screen, so that the multi-form sounding screen is realized.

In summary, the sound generating screen provided in the embodiment of the present application includes the display function layer 1, the auxiliary sound generating layer 2, and the plurality of piezoelectric excitation units 4, where the display function layer 1 includes a membrane, the auxiliary sound generating layer 2 is provided with the plurality of sound generating cavities 5, the plurality of sound generating cavities have the same size, the piezoelectric excitation units 4 may be respectively and correspondingly disposed in the sound generating cavities 5, and the specifications of the plurality of piezoelectric excitation units are the same. Through the cooperation of the sound production cavity 5 on the supplementary sound production layer 2 and the piezoelectric excitation unit 4, form resonant cavity, inside air column vibration promotes the loudness of corresponding frequency channel, effectively improves the bass effect of this sound production screen. And because the distribution of screen own degree of freedom is different, the amplitude of its different regions is also different, therefore the sound production frequency channel of unit vibrating diaphragm on the different positions is different, every piezoelectricity excitation unit 4 and sound production cavity 5 cooperation form the unit vibrating diaphragm, whole vibrating diaphragm is constituteed to a plurality of unit vibrating diaphragms, independently sound production through each unit vibrating diaphragm, its sum forms required frequency response, effectively improve the sound production loudness of this sound production screen, solve the sound production screen bass effect poor, the problem of loudness inadequately.

Some embodiments of the present application further provide a projection television, where the projection television includes a projection device and any sound-emitting screen provided in the foregoing embodiments, and the projection device is configured to put a projection picture onto the sound-emitting screen, and the sound-emitting screen is configured to display the projection picture put by the projection device. The projection television includes the sound emitting screen provided by any of the above embodiments, so that the projection television has the beneficial technical effects described in any of the above embodiments, and will not be described herein.

The foregoing description of the preferred embodiments of the present application is not intended to limit the application, but is intended to cover all modifications, equivalents, alternatives, and improvements falling within the spirit and principles of the application.

The above-provided detailed description is merely a few examples under the general inventive concept and does not limit the scope of the present application. Any other embodiments which are extended according to the solution of the application without inventive effort fall within the scope of protection of the application for a person skilled in the art.

Claims (10)

1. A sound emitting screen comprising:

A display function layer including a membrane;

the auxiliary sounding layer is provided with a plurality of sounding cavities, and the sounding cavities are the same in size;

The piezoelectric excitation units are respectively arranged in the sounding cavities, and the specifications of the piezoelectric excitation units are the same.

2. The sound generating screen of claim 1, wherein a plurality of the sound generating cavities are each disposed at a central position of the auxiliary sound generating layer.

3. The sound generating screen of claim 1, wherein a plurality of the sound generating cavities are disposed at edge positions of the auxiliary sound generating layer.

4. The sound generating screen according to claim 1, wherein the auxiliary sound generating layer comprises a plurality of sound generating partitions, and a plurality of sound generating cavities are respectively arranged at middle positions of the sound generating partitions or at edge positions of the sound generating partitions.

5. The sound generating screen of claim 1, wherein a plurality of the sound generating cavities are disposed at a central position and an edge position of the auxiliary sound generating layer.

6. The sound-emitting screen of claim 1, wherein the sound-emitting cavities are arranged on the auxiliary sound-emitting layer in a uniform arrangement, a cross arrangement or a layer arrangement.

7. The sound-emitting screen according to claim 1, wherein the plurality of piezoelectric excitation units are respectively disposed on a side of the plurality of sound-emitting cavities close to the diaphragm, or the plurality of piezoelectric excitation units are respectively disposed on a side of the plurality of sound-emitting cavities away from the diaphragm.

8. The sound-producing screen of claim 1, wherein a groove is provided on a side of the auxiliary sound-producing layer away from the display function layer; and a first sealing layer is arranged on a side cover, far away from the display functional layer, of the groove, and the first sealing layer and the groove form the sounding cavity.

9. The sound-emitting screen of claim 1, wherein the auxiliary sound-emitting layer is provided with a through hole; the depth direction of the through hole is parallel to the thickness direction of the auxiliary sounding layer, a second sealing layer is covered on one side of the through hole, which is far away from the display functional layer, and the through hole and the second sealing layer form the sounding cavity.

10. A projection television comprising a projection device for projecting a projection screen onto the sound-emitting screen and the sound-emitting screen of any one of claims 1-9 for displaying the projection screen projected by the projection device.