CN118118841A - Sounding screen and projection television - Google Patents

Abstract

The application provides a sound-producing screen and a projection television, wherein a sound-producing cavity shell is arranged on one side of a membrane far away from a display functional layer in an auxiliary sound-producing layer, and the sound-producing cavity shell and the auxiliary sound-producing layer can be encircled to form a sound-producing cavity for producing sound. The first piezoelectric excitation unit is arranged inside the sounding cavity, so that the first piezoelectric excitation unit, the auxiliary sounding layer and the sounding cavity shell can form a resonant cavity, the air column inside the sounding cavity is driven to vibrate when the first piezoelectric excitation unit vibrates, sound is amplified through resonance, the effect of increasing sound intensity is achieved, and the bass effect is improved. Meanwhile, the first piezoelectric excitation unit is lighter in weight, so that the dead weight of the sounding screen can be effectively reduced by arranging the piezoelectric excitation unit, and the effect of reducing the weight of the sounding screen is achieved.

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 present application relates to the field of projection devices, and in particular, to a sound emitting 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

The application provides a sound production screen and a projection television, which are used for solving the problem that the sound effect of the sound production screen is affected after a weight-reducing electromagnetic loudspeaker is used.

In a first aspect, some embodiments of the present application provide a sound-emitting screen, including a display function layer and an auxiliary sound-emitting layer, where the display function layer includes a membrane; at least one sounding cavity shell is arranged on one side, far away from the membrane, of the auxiliary sounding layer, and the sounding cavity shell and the auxiliary sounding layer are laminated to form a sounding cavity;

the first piezoelectric excitation unit is arranged in the sounding cavity, so that the resonance cavity is formed by the first piezoelectric excitation unit, the auxiliary sounding layer and the sounding cavity shell.

In some embodiments of the present application, the auxiliary sound-producing layer includes a first skin, a second skin, and an intermediate layer, the intermediate layer being disposed snugly between the first skin and the second skin; the intermediate layer includes a honeycomb core composed of a plurality of cell cells, a support structure of the honeycomb core being perpendicular to the first skin and the second skin.

In some embodiments of the application, further comprising a shock absorber layer and a suspension bracket; the damping layer is arranged on one side of the auxiliary sounding layer, which is far away from the diaphragm; one end of the suspension bracket is arranged on the hanging surface, and the other end of the suspension bracket is fixed with the damping layer.

In some embodiments of the present application, the sound-producing device further comprises a frame, wherein the frame is circumferentially arranged on the periphery of the diaphragm and the auxiliary sound-producing layer; the sounding cavity shell is formed by surrounding the frame, the second skin and the hanging surface.

In some embodiments of the present application, the connection mode between the sounding cavity housing and the auxiliary sounding layer is one of double faced adhesive tape lamination, screw connection or magnetic attraction lamination; the installation mode of the first piezoelectric excitation unit and the sounding cavity is double faced adhesive tape lamination or magnetic attraction lamination.

In some embodiments of the present application, the first piezoelectric excitation unit is disposed on a skin layer side of the auxiliary sound generation layer, or the first piezoelectric excitation unit is disposed on a side of the sound generation cavity housing away from the diaphragm, or the first piezoelectric excitation unit is disposed in the middle of the sound generation cavity housing.

In some embodiments of the present application, the device further comprises a first connection mechanism and a second connection mechanism, wherein one end of the first connection mechanism is connected with the first piezoelectric excitation unit, the other end of the first connection mechanism is connected with the top of the sounding cavity housing, one end of the second connection mechanism is connected with the first piezoelectric excitation unit, and the other end of the second connection mechanism is connected with the bottom of the sounding cavity housing.

In some embodiments of the present application, a second piezoelectric excitation unit is further included, the second piezoelectric excitation unit being located in an upper region of the auxiliary sound generation layer, and the first piezoelectric excitation unit being located in a lower region of the auxiliary sound generation layer.

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 membrane, so that the auxiliary sounding layer and the membrane are bonded to form a composite vibrating diaphragm structure.

In a second aspect, some embodiments of the present application provide a projection television, where the projection television includes a projection device and the sound-emitting screen provided in the first aspect, 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.

According to the sounding screen and the projection television provided by the scheme, the sounding cavity shell is arranged on one side, far away from the membrane of the display functional layer, of the auxiliary sounding layer, and the sounding cavity shell and the auxiliary sounding layer can surround to form a sounding cavity for sounding. The first piezoelectric excitation unit is arranged inside the sounding cavity, so that the first piezoelectric excitation unit, the auxiliary sounding layer and the sounding cavity shell can form a resonant cavity, the air column inside the sounding cavity is driven to vibrate when the first piezoelectric excitation unit vibrates, sound is amplified through resonance, the effect of increasing sound intensity is achieved, and the bass effect is improved. Meanwhile, the first piezoelectric excitation unit is light in self-texture, so that the dead weight of the sounding screen can be effectively reduced by arranging the first piezoelectric excitation unit, and the effect of reducing the weight of the sounding screen is achieved.

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;

FIG. 3 is a left side view of the mounting relationship of the auxiliary sound emitting layer, the functional display layer, and the sound emitting cavity housing;

FIG. 4 is an exploded view of the sound screen structure according to an embodiment of the present application;

FIG. 5 is a schematic diagram showing connection between a piezoelectric excitation unit and a power supply according to an embodiment of the present application;

FIG. 6 is a second schematic diagram of connection between the piezoelectric excitation unit and the power supply according to the embodiment of the present application;

FIG. 7 is a schematic diagram of a power connection in which the piezoelectric excitation units are connected in series in an embodiment of the present application;

FIG. 8 is a diagram showing a power connection mode in which the piezoelectric excitation units are connected in parallel in an embodiment of the present application;

FIG. 9 is a schematic diagram of one of the positive and negative electrodes of the piezoelectric excitation unit according to an embodiment of the present application;

FIG. 10 is a schematic diagram of the second positive and negative electrodes of the piezoelectric excitation unit according to the embodiment of the present application;

FIG. 11 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. 12 is a second 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. 13 is one of the left side views of the mounting relationship of the auxiliary sound generating layer and the plurality of sound generating cavities in an embodiment of the present application;

FIG. 14 is a second left side view of the installation relationship of the auxiliary sound generating layer and the plurality of sound generating cavities according to the embodiment of the present application;

FIG. 15 is a left side view of the mounting relationship of the auxiliary sound emitting layer and the plurality of piezoelectric excitation units in an embodiment of the present application;

Fig. 16 is a schematic view of a sound-emitting screen with two sound-emitting cavities surrounded by vertical beams according to an embodiment of the present application.

Illustration of:

Wherein 1, -a surface layer, 2, -a coloring layer, 3, -a diffusing layer, 4, -a fresnel lens layer, 5, -a reflecting layer, 6, -a support structure; the display device comprises a display functional layer, a 2-auxiliary sounding layer, a 21-first skin, a 22-second skin, a 23-middle layer, a 3-sounding cavity shell, a 31-first sounding cavity shell, a 32-second sounding cavity shell, a 4-first piezoelectric excitation unit, a 5-sounding cavity, a 53-large-volume sounding cavity, a 54-small-volume sounding cavity, a 6-bonding layer, a 7-frame, an 8-shock absorption layer and a 9-vertical beam.

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 be implemented to 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 also comprises a sounding screen matched with the projection device. The main components of the projection screen are a display functional layer, an adhesive layer and a supporting structure, wherein the display functional layer is basically composed 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: surface layer 1 ^,, color layer 2 ^,, diffuser layer 3 ^,, fresnel microlens layer 4 ^,, reflective layer 5 ^,, and support structure 6 ^,. Light emitted by the ultra-short focal projection device is refracted by the surface of the screen, enters the screen, is reflected by the Fresnel micro-lens layer 4 ^, (the back surface of the screen is coated with an aluminum reflecting layer), and then exits from the screen, finally enters human eyes, and is passive display.

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 electromagnetic exciter has heavy weight and needs to form a vibration cavity with the auxiliary sounding layer, so that only the strength of the plate-type screen can be supported, the common frame-type screen synthetic cloth is lighter and thinner, and the electromagnetic exciter is difficult to support, therefore, the electromagnetic exciter has limited application scenes and is easy to damage the screen.

The method aims at solving the problems that noise can be generated when the projection television is sounding to influence the sound effect or influence the screen display effect after the panel-type screen is thinned and lightened. Some embodiments of the present application provide a sound generating screen, which includes a display function layer 1, an auxiliary sound generating layer 2 and a piezoelectric excitation unit 4, wherein at least one sound generating cavity 5 is disposed on the auxiliary sound generating layer 2 and is used for generating sound in cooperation with the piezoelectric excitation unit 4.

The display function layer 1 includes a film, where the film refers to a projection film of the display function layer 1, and is used to display a projection picture, and the projection device is used to put a video picture to be put on a sound-producing screen, so that a user can directly see the same video resource played by an electronic display screen (such as a television, a liquid crystal display, a mobile phone, etc.) 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 some embodiments, the film may be a spectrally selective spray coating, a solid film (e.g., a cloth), an optical film, a fresnel film, a black-grid film, a projection screen, etc., which may be implemented with only one material. The diaphragm can be of a single-layer structure or a multi-layer structure, for example, the Fresnel diaphragm is of a multi-layer structure, but the projection function can be realized without compounding with other materials, so that the auxiliary sounding layer 2 can be attached to the diaphragm formed by the multi-layer structure, and the auxiliary sounding layer 2 is driven to vibrate wholly when the piezoelectric excitation unit in the sounding cavity 3 sounds and vibrates, and then the diaphragm is driven to realize single-layer vibrating diaphragm sounding.

The sound production screen can also realize sound production through the compound vibrating diaphragm structure, in some embodiments, still is provided with adhesive layer 6 between supplementary sound production layer 2 and display function layer 1, adhesive layer 6 makes supplementary sound production layer 2 of adhesion and diaphragm form compound vibrating diaphragm structure through supplementary sound production layer 2 of adhesion and diaphragm.

The composite vibrating diaphragm structure is equivalent to the vibrating diaphragms with different materials, and the natural frequencies are different, so that the composite vibrating diaphragm structure is favorable for realizing frequency band broadening. In this embodiment, the adhesive layer 6 and the membrane adhered to the adhesive layer 6 correspond to the added diaphragm, and form a multi-layer composite diaphragm structure with different materials with the auxiliary sound generating layer 2. When the piezoelectric excitation unit in the sounding cavity 3 sounds and vibrates, the auxiliary sounding layer 2 is driven to vibrate integrally, so that the composite vibrating diaphragm is jointly sounded together with the bonding layer 6 and the diaphragm.

In some embodiments, projection paint can be sprayed on the diaphragm, so that the projection display effect of the diaphragm can be realized, a composite diaphragm structure of different materials can be formed by the paint layer and the diaphragm, and multi-band sounding can be realized by matching with the piezoelectric excitation unit 4. In order to ensure that the coating layer is not damaged, a protective layer can be covered on the coating layer, and then the auxiliary sounding layer 2 is adhered to the protective layer, so that the coating layer is protected, and a composite vibrating diaphragm structure is formed.

In the supplementary sound production layer 2, one side of keeping away from the diaphragm is provided with sound production cavity shell 3, and sound production cavity shell 3 is the groove type structure generally, and the notch is towards supplementary sound production layer 2, and one side of keeping away from the diaphragm with supplementary sound production layer 2 forms outside convex sound production cavity 5. Wherein, the connection mode of the sounding cavity shell 3 and the auxiliary sounding layer 2 can be one of double-sided adhesive bonding, screw connection or magnetic attraction bonding.

The first piezoelectric excitation unit 4 is disposed inside the sounding cavity 5, and the sounding cavity housing 3 is correspondingly covered on the first piezoelectric excitation unit 4, so as to provide a space for mounting the first piezoelectric excitation unit 4. Furthermore, the sounding cavity housing 3 may also play a protective role for the first piezoelectric excitation unit 4. In addition, when the first piezoelectric excitation unit 4 vibrates, the air column in the sounding cavity 5 vibrates, so that the sounding cavity housing 3 can also play a role in transmitting vibration. The installation mode of the first piezoelectric excitation unit and the sounding cavity is double faced adhesive tape lamination or magnetic attraction lamination.

In some embodiments, as shown in fig. 3, the auxiliary sound-emitting layer 2 includes a first skin 21, a second skin 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 21 and the second skin 22 are respectively fitted on both sides of the intermediate layer 23. When the first piezoelectric excitation unit 4 needs to vibrate in a sounding way, the auxiliary sounding layer 2 can be driven to vibrate, and at the moment, the skin layer of the auxiliary sounding layer 2 can vibrate synchronously with the first piezoelectric excitation unit 4 to achieve the effect of enhancing the sound effect.

The intermediate layer 23 is provided between the first skin 21 and the second skin 22 in a fitting manner. The middle layer 23 includes a honeycomb core composed of a plurality of cell spaces, and sound generated by the first piezoelectric excitation unit 4 can be enhanced in sound effect by the plurality of cell spaces provided inside the honeycomb core, and the plurality of cell spaces can maximize the residence time of sound waves, absorb noise generated by the first piezoelectric excitation unit 4 by the honeycomb core structure, filter the generated sound, and improve the sound quality effect.

The sounding cavity housing 3 is mounted on the second skin 22 of the auxiliary sounding layer 2 far from the diaphragm when mounted, and in some embodiments, in order to enable the first skin 21 and the second skin 22 in the auxiliary sounding layer 2 to achieve the same effect of transmitting vibration, the material of the sounding cavity housing 3 may be the same as that of the first skin 21 near one side of the diaphragm. In the present embodiment, the first skin 21, the second skin 22, and the sound emitting cavity 5 formed by bulging outward are all made of the same skin material, and have the same ability to transmit vibrations.

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 near one side of the membrane is adhered to the display function layer 1 through the adhesive layer 6. When the first 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 vibration of the auxiliary sound generating layer 2 is in multi-mode on the whole surface of the auxiliary sound generating layer 2, the auxiliary sound generating layer 2 can vibrate together at a plurality of positions with the surface as a whole, and therefore the front surface of the auxiliary sound generating layer 2 can generate sound.

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

In some embodiments, referring to fig. 4, an adhesive layer 6 is further provided between the auxiliary sound emitting layer 2 and the diaphragm for securing the auxiliary sound emitting layer 2 and the diaphragm together to form a composite diaphragm structure. The composite vibrating diaphragm structure composed of the auxiliary sounding layer 2, the bonding layer 6 and the display functional layer 1 can realize sounding through vibrating diaphragms made of different materials and matched with the piezoelectric excitation unit 4.

The first piezoelectric excitation unit 4 is disposed inside the sounding cavity housing 3, so that the first piezoelectric excitation unit 4 and the sounding cavity housing 3 form a resonant cavity. The natural frequency of the emitted sound is not changed by the existence of the resonant cavity, but the sound is amplified through resonance, so that the effect of increasing the sound intensity is achieved. When the sounding screen needs to sound, the first piezoelectric excitation unit 4 is attached to the cavity wall of the sounding cavity shell 3 to vibrate in the same direction, the sounding cavity shell 3 can synchronously drive the auxiliary sounding layer 2, and vibration is transmitted to the display functional layer 1 through the first skin 21 attached to the bonding layer 6, so that the diaphragm vibrates, and sounding is achieved.

The first piezoelectric excitation unit 4 can drive the whole sound generating cavity 5 to vibrate in vibration, the sound generating cavity shell 3 can vibrate synchronously along with the sound generating cavity 5, the vibration is transmitted to the auxiliary sound generating layer 2, and then the auxiliary sound generating layer 2 and the diaphragm vibrate synchronously, so that the first piezoelectric excitation unit 4, the auxiliary sound generating layer 2, the diaphragm and the bonding layer 6 can generate sound together as a composite diaphragm.

The first piezo-electric stimulation unit 4 needs to be connected to a power source in order to be able to produce vibration, and in some embodiments there are several ways in which the first piezo-electric stimulation unit 4 is connected to a power source. Referring to fig. 5-7, the embodiment shown in fig. 5 is to input a signal and a power supply into a power amplifier converter, and the power amplifier converter is connected with a single or multiple first piezoelectric excitation units 4 to supply power to the first piezoelectric excitation units 4.

The embodiment shown in fig. 6 is to input the signal and the power supply together to a voltage converter, which is connected to the single or a plurality of first piezo-electric excitation units 4, so that the power supply to the first piezo-electric excitation units 4 is realized.

It should be noted that the embodiments shown in fig. 5 and 6 are merely illustrative of two different power supply modes, and are not limited to the above-described input signal or power supply modes. In some embodiments of the present application, the power amplifier converter and the voltage converter may receive the input signal and the power supply respectively, or both the power supply of the input signal and the power supply of the input signal simultaneously.

As shown in fig. 7 and fig. 8, when the sounding screen has a plurality of first piezoelectric excitation units 4, the connection modes of the first piezoelectric excitation units 4 may be serial or parallel, and in some embodiments of the present application, the first piezoelectric excitation units 4 may also adopt a serial-parallel hybrid design, so long as all the first piezoelectric excitation units 4 can be powered.

In some embodiments, the first piezoelectric excitation unit 4 is composed of a multilayer ceramic and positive and negative electrode pins. Wherein, the thickness and the material of each layer of ceramic can be the same or different. As shown in fig. 9 and 10, the positions of the positive and negative electrodes may be the same or different. The areas of each piece of ceramic material covering the anode and the cathode can be the same or different, and the connection modes of the internal multilayer ceramic can be the same or different.

Since the sound emitting cavity housing 3 is located outside the auxiliary sound emitting layer 2, in some embodiments of the present application, the thickness of the sound emitting cavity housing 3 should not exceed the thickness of the auxiliary sound emitting layer 2 in order not to increase the volume of the projection television. In this embodiment, the thickness of the sounding cavity housing 3 may be 1/4 to 3/4 of the thickness of the auxiliary sounding layer 2. The larger the thickness of the sound emitting cavity housing 3, the larger the volume enclosed by the sound emitting cavity 5. When the volumes of the corresponding sound emitting cavities 5 are different, the volumes of the air columns inside the sound emitting cavities 5 are also different. For air columns with different volumes, when the first piezoelectric excitation unit 4 vibrates, the sound effect generated by the sounding cavity 5 is different.

In some embodiments, the overall shape of the first piezoelectric excitation unit 4 may be circular, rectangular, square, profiled, etc., and the shape of each layer of piezoelectric ceramic material may be circular, rectangular, square, profiled, etc. For example, referring to fig. 9 and 10, the first 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. 9 and 10. The natural vibration frequency of the first piezoelectric excitation unit is related to materials, areas, layers and internal connection modes, when the characteristics of the vibrating membranes are the same, but the frequencies of the first piezoelectric excitation unit 4 are different, the formed integral shows that the vibration frequencies are different, and different sound effects are realized.

An external sounding cavity 3 is arranged on one side, far away from the diaphragm, of the auxiliary sounding layer 2, the piezoelectric excitation unit 4 is located in the sounding cavity 3, the piezoelectric excitation unit 4 drives the vibrating diaphragm attached to the piezoelectric excitation unit to vibrate, and then air vibration in the cavity is pushed to vibrate, so that the loudness can be improved.

Specifically, the first piezoelectric excitation unit may be disposed on one side of the skin layer of the auxiliary sounding layer 2, or the first piezoelectric excitation unit may be disposed on one side of the sounding cavity housing away from the diaphragm, or the first piezoelectric excitation unit may be disposed in the middle of the sounding cavity housing. The first piezoelectric excitation unit 4 has different vibration transmission effects at different positions in the sound generating cavity 5. The sounding screen proposed by the present application is specifically described below by several embodiments:

example 1:

In embodiment 1, the first piezoelectric excitation unit 4 is disposed on one side of the sound generating cavity 5 near the diaphragm, and when the first piezoelectric excitation unit 4 generates vibration, the vibration direction of the whole sound generating screen is that of a face-to-face viewer, and the sound propagates through radiation and is accepted by the viewer. The vibration sound wave can be transmitted to the auxiliary sounding layer 2 through one side of the sounding cavity 5, which is close to the diaphragm, so that the auxiliary sounding layer 2 timely vibrates in the same direction with the first piezoelectric excitation unit 4, and the vibration propagation direction generated by the diaphragm faces the viewer, so that the effect of receiving sound by the viewer is improved.

When the first piezoelectric excitation unit 4 is disposed on the side of the sound-emitting cavity 5 close to the diaphragm, as shown in fig. 11, the first piezoelectric excitation unit 4 may be directly mounted on the second skin 22 of the auxiliary sound-emitting layer 2 remote from the diaphragm. When the first piezoelectric excitation unit 4 is electrified to vibrate, the second skin 22 is driven to vibrate first, then, the second skin 22 can transmit the vibration effect to the whole auxiliary sounding layer 2 through the middle layer 23, and then the diaphragm can vibrate synchronously through the bonding layer 6 between the auxiliary sounding layer 2 and the diaphragm, and the effect of enhancing the sound effect is achieved through the resonance effect of the whole diaphragm. In the above embodiment, the sound emitting cavity 5 does not participate in actively emitting vibration, and the effect of enhancing the sound effect is achieved only by the cavity structure.

In the above process, after the piezoelectric excitation unit 4 generates the vibration, the first propagation direction of the vibration generated by the internal air column of the sound generating cavity 5 is far away from the viewer, and after the vibration is transferred to the sealing layer or the sound generating cavity housing 3, the propagation direction is changed by reflection. The sealing layer or the sounding cavity shell 3 can play a role in interference of sound waves, absorb noise and improve tone quality.

In some embodiments, absorption of noise with different wavelengths can also be achieved by selective design of the material, structure of the sealing layer or the sound producing cavity housing 3.

Example 2:

In embodiment 2, the first piezoelectric excitation unit 4 is disposed on one side of the sound generating cavity 5 away from the diaphragm, so that the vibration sound wave can be transmitted to the auxiliary sound generating layer 2 through the air column in the auxiliary sound generating cavity 5, and simultaneously, the vibration is transmitted to the auxiliary sound generating layer 2 through the sound generating cavity shell 3, and the sound wave can generate a resonance effect in the transmission process, so that the sound quality is improved. Simultaneously, supplementary sound production layer 2 and diaphragm are realized the sound production as the vibrating diaphragm, and the inside air column of sound production cavity 5 vibrates under the effect of first piezoelectricity excitation unit 4, and the existence of air column is equivalent to increasing the load for supplementary sound production layer 2, improves sound intensity.

In embodiment 2, when the first piezoelectric excitation unit 4 is disposed on one side of the sound generating cavity 5 away from the diaphragm, the first piezoelectric excitation unit 4 is mounted inside the sound generating cavity housing 3, and when the first piezoelectric excitation unit 4 is energized to vibrate, the sound generating cavity housing 3 is driven to vibrate first, so that the sound generating cavity 5 is integrally vibrated, and then the second skin 22 of the auxiliary sound generating layer 2 is driven to vibrate synchronously, the second skin 22 transmits the vibration to the first skin 21 through the honeycomb core structure in the middle layer 23, and the first skin 21 transmits the vibration to the diaphragm through the bonding layer 6, so that the diaphragm vibrates integrally, and a sound generating effect is achieved.

In the above embodiment, as shown in fig. 12, the first piezoelectric excitation unit 4 is installed on the plane where the bottom of the groove of the sound generating cavity housing 3 is located when it is disposed on the side of the sound generating cavity 5 away from the diaphragm. Thus, in some embodiments, the material from which the sound generating cavity housing 3 is made needs to have a certain adsorptivity, so that the first piezoelectric excitation unit 4 can be more firmly mounted on the sound generating cavity housing 3. Simultaneously, can also be convenient for sound production cavity shell 3 firm install on supplementary sound production layer 2, can not lead to sound production cavity shell 3 not hard up and drop because of sound production cavity 5 drives supplementary sound production layer 2 vibration when the frequency of vibration is too big to can also guarantee that first piezoelectricity excitation unit 4 is when the circular telegram vibration, the acoustic wave that forms can not run off in the gap of becoming flexible, improves the tone quality effect of audio frequency sound production.

When the first piezoelectric excitation unit 4 vibrates, the sounding cavity housing 5 is driven to vibrate synchronously, and the sounding cavity 5 can vibrate synchronously due to the vibration of the first piezoelectric excitation unit 4 and the sounding cavity housing 5 and drive the second skin 22 of the auxiliary sounding layer 2 to vibrate in the same direction.

When the first piezoelectric excitation unit 4 is mounted on the side of the cavity away from the diaphragm, the first piezoelectric excitation unit 4 is still within the thickness range of the auxiliary sound generating layer 2. The sum of the thicknesses of the auxiliary sounding layer 2 and the sealing layer is smaller than the whole thickness of the sounding screen, so that the thickness of the sounding screen can not be additionally increased by the structural design, and the sounding screen is concise and attractive.

The arrangement of the first piezoelectric excitation unit 4 can be adaptively adjusted according to the environment of the projection television provided with the sound-producing screen.

In the above embodiments 1 and 2, the first piezoelectric excitation unit 4 is disposed inside the sounding cavity 5, and the first piezoelectric excitation unit 4, the auxiliary sounding layer 2, and the sounding cavity housing 3 form a resonant cavity. When the sounding screen needs to sound, the first piezoelectric excitation unit 4 can make the air column in the resonant cavity vibrate to make sound. The natural frequency of the emitted sound is not changed by the existence of the resonant cavity, but the sound is amplified through resonance, so that the effect of increasing the sound intensity is achieved.

In some embodiments of the present application, if the number of sound emitting cavities 5 provided on the auxiliary sound emitting layer 2 is one, the single cavity is mainly used for enhancing the loudness of sound, and the sound emitting cavities 5 and the auxiliary sound emitting layer 2 and the membrane form resonance between the vibrating diaphragm and the air column to amplify the sound.

If the number of the sounding cavities 5 provided on the auxiliary sounding layer 2 is plural, a multi-cavity sounding mode is set. There may also be a plurality of first piezoelectric excitation units 4 installed inside the sound emitting cavities 5 corresponding to the plurality of sound emitting cavities 5. Due to the fact that physical properties such as materials and dimensions of the first piezoelectric excitation units 4 are different, cavity structures of the sound-emitting cavities 5 are different, and therefore the whole vibrating diaphragm can form a combined set of vibrating diaphragm units with multiple vibration modes. When the material properties of the first piezoelectric excitation unit 4 are changed or the structure of the sound generating cavity 5 is different, the natural frequency of the diaphragm is changed. The plurality of diaphragm units are integrated together, so that a larger sound frequency response range can be realized. Different combinations of cavities, such as different combinations of materials of the piezoelectric excitation unit 4, the size of the cavities and the sealing covers of the cavities, are equivalent to different vibration mode combinations, and can improve the sound effect emitted by the sound emitting screen.

Example 3:

The first piezoelectric excitation unit 4 may be mounted in a central position of the sound generating cavity 5, i.e. the first piezoelectric excitation unit 4 is connected to a central region of the sound generating cavity housing 3. The connection mode of the first piezoelectric excitation unit 4 and the sounding cavity housing 3 can be a bracket mode, a sticking mode and the like. When the support is used for connection, the damping layer is required to be additionally arranged to form the double-resonance cavity, so that the effect of improving the loudness is achieved.

In some embodiments, the first piezoelectric excitation unit 4 may be connected to the sound emitting cavity housing 3 by a first connection mechanism and a second connection mechanism. One end of the first connecting mechanism is connected with the first piezoelectric excitation unit 4, the other end of the first connecting mechanism is connected with the top of the sounding cavity shell 3, one end of the second connecting mechanism is connected with the first piezoelectric excitation unit 4, and the other end of the first connecting mechanism is connected with the bottom of the sounding cavity shell 3. The first connecting mechanism and the second connecting mechanism suspend the first piezoelectric excitation unit 4 and the inside of the sounding cavity 5, so that the first piezoelectric excitation unit drives an air column in the sounding cavity 5 to vibrate when vibrating, and sounding of the sounding cavity 5 is realized.

Example 4:

In embodiment 4, a plurality of sound emitting cavities 5 may also be provided on the auxiliary sound emitting layer 2. In this embodiment, the plurality of sound emitting cavities 5 may be the same or different in size. Referring to fig. 13, fig. 13 shows two sound emitting cavities 5 provided on the auxiliary sound emitting layer 2, which are a large-volume sound emitting cavity 53 and a small-volume sound emitting cavity 54, respectively, wherein the thickness of the large-volume sound emitting cavity 53 is greater than that of the small-volume sound emitting cavity 54. When the sound emitting cavities 5 are different in size, the volumes of the corresponding air columns in each sound emitting cavity 5 are also different, and the generated sound effects are also different. Therefore, the audio effect with a larger range of sound can be emitted through the cooperation between the sounding cavities 5 with different volume sizes.

As shown in fig. 14, in some embodiments of the present application, the large volume sound emitting cavity 53 and the small volume sound emitting cavity 54 may also be disposed at the same level on the auxiliary sound emitting layer 2 at the same time, so as to achieve a sound emitting effect on the same level, so that the sound emitting effect is smoother.

In some embodiments of the present application, as shown in fig. 15, the first piezoelectric excitation units 4 may be installed on two non-adjacent inner walls inside the sounding cavity 5, and two vibration sources exist inside the sounding cavity 5, so that the sound emitted by the sounding cavity 5 has a reverberation effect.

It should be noted that the number of the first piezoelectric excitation units 4 is not fixed, and the purpose of setting a plurality of first piezoelectric excitation units 4 to make up sound is to realize more mode density and mode number, and realize the effect of frequency band broadening. The arrangement of the plurality of excitation units 4 is equivalent to the sounding partition realized by the whole sounding screen, and the modal density and the modal quantity of the region corresponding to each piezoelectric excitation unit 4 are related to the vibrating diaphragm material and the vibrating diaphragm structure, and the excitation unit material, the power and the structure.

In some embodiments of the application, the first piezoelectric excitation unit 4 may also be disposed on the upper side or the lower side of the sound emitting cavity 5. When the projection television with the sound emitting screen is installed in a living room, an office or the like, the main sound emitting position may be the front or the upper side of the projection television, and at this time, the first piezoelectric excitation unit 4 may be disposed on the side (the front of the projection television) of the sound emitting cavity 5 close to the diaphragm or above the sound emitting cavity 5 according to the sound emitting position of the projection television, so that the user can better hear the sound source.

Correspondingly, when the projection television with the sound-producing screen is applied to a higher position, for example, a large screen projection device for propaganda, a projection device of a conference room, and the like. In order to be used by multiple persons, the projection television needs to be installed at a high position, and a user will usually be located below the projection television to listen to the projection television, so the main sound-producing position of the projection television may be in front of or below the projection television. At this time, the first piezoelectric excitation unit 4 may be disposed at a side of the sound emission chamber 5 near the diaphragm (in front of the projection television) or below the sound emission chamber 5 according to the sound emission position of the projection television, so that the user can better hear the sound source.

The user will typically be located on the front of the sound screen to view what the sound screen displays. When the first piezoelectric excitation unit 4 is disposed on the side of the sound generation cavity 5 close to the diaphragm, the position of vibration is close to the position of the user, and the enhancement effect of the generated sound is large. When the volume of the played original sound of the video source is large, the first piezoelectric excitation unit 4 is arranged on one side of the sound generating cavity 5 away from the membrane, the vibration position is away from the position of the user, and the enhancement effect of the generated sound is small.

In some embodiments, the first piezoelectric excitation unit 4 may be a sheet-like piezoelectric ceramic material. The laminar piezoelectric ceramic material may also be referred to as a piezoelectric ceramic sheet. The sounding principle of the first piezoelectric excitation unit 4 is as follows: the piezoelectric ceramic piece is attached to the sounding substrate of the sounding screen, and after being electrified, the piezoelectric ceramic piece deforms along the direction perpendicular to the piezoelectric ceramic plane, and then drives the sounding substrate to vibrate in the same direction so as to realize sounding.

It is noted that, because the conventional piezoelectric ceramic plate is limited by the process technology, the sounding frequency band is narrower, and most of the piezoelectric ceramic plates are used as buzzers. Therefore, in some embodiments, the sheet-shaped piezoelectric ceramic material is not a traditional 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 of the sheet-shaped piezoelectric ceramic material is expanded, the piezoelectric ceramic and 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. And combining the piezoelectric ceramic sounding with the laser projection screen to realize the polymorphic laser projection sounding screen.

It should be noted that the size and shape of the sounding cavity housing 3 are not fixed, and may be selected according to the practical application scenario, in some embodiments, the sounding screen further includes a piezoelectric excitation unit directly mounted on the auxiliary sounding layer 2, and in this embodiment, the piezoelectric excitation unit directly mounted on the auxiliary sounding layer 2 is referred to as a second piezoelectric excitation unit, for distinguishing from the first piezoelectric excitation unit 4. The second piezoelectric excitation unit is not provided with a sounding cavity shell 3 for covering the second piezoelectric excitation unit, but is directly arranged on the auxiliary sounding layer 2 and is arranged in the same direction as the first piezoelectric excitation unit 4.

The second piezoelectric excitation unit may also be installed in a region with the first piezoelectric excitation unit 4 and generate sound in cooperation with each other, for example, the second piezoelectric excitation unit is installed in an upper region of the auxiliary sound generation layer 2, and the first piezoelectric excitation unit 4 is installed in a lower region of the auxiliary sound generation layer. The sounding loudness of the sounding cavity 5 is larger than the loudness of the second piezoelectric excitation unit independently sounding, so that the sounding cavity 5 and the second piezoelectric excitation unit can be alternately matched to realize more frequency sounding effects.

Because the piezoelectric excitation unit is adopted in the sounding screen provided by the embodiment, but not the electromagnetic exciter in the related art, and meanwhile, the piezoelectric excitation unit is made of the sheet piezoelectric ceramic material, compared with the electromagnetic exciter, the piezoelectric excitation unit made of the sheet piezoelectric ceramic material can effectively reduce the self weight, thereby realizing the weight reduction of the whole sounding screen and effectively reducing the dead weight of the sounding screen on the premise of ensuring good sounding effect.

In some embodiments, the first piezoelectric excitation unit 4 and the second piezoelectric excitation unit may be mounted in close proximity and non-close proximity, the degree of closeness of the attachment being related to noise generated when the first piezoelectric excitation unit 4 or the second piezoelectric excitation unit sounds. Taking the first piezoelectric excitation unit 4 as an example for explanation, the closer the bonding is, the smaller the gap between the first piezoelectric excitation unit 4 and the auxiliary sounding layer 2 is, when the first piezoelectric excitation unit 4 drives the auxiliary sounding layer 2 to vibrate, noise can be generated due to collision between the first piezoelectric excitation unit 4 and the auxiliary sounding layer 2, the closer the first piezoelectric excitation unit 4 drives the auxiliary sounding layer 2 to be bonded, the smaller the generated noise is, and the sound quality effect when the projection television emits audio is improved.

In order to ensure that the shape of the shell of the sound generating cavity 5 is stable, the material for manufacturing the shell 3 of the sound generating cavity also needs to have certain hardness, so that the sound generating cavity 5 is prevented from being damaged due to extrusion of devices in the installation process of the sound generating screen. In some embodiments, the material of the sound emitting cavity housing is one of a thin layer of metal, plastic, or kraft paper.

When adopting thin layer metal as sound production cavity shell 3, the casing of metal material is favorable to improving sound production cavity shell 3's life, and the selectivity of metal is wider simultaneously, can select corresponding metal material according to different sound production demands, for example can select the higher metal of stability relatively, like copper. When the thin metal is selected as the sounding cavity shell 3, the thin metal can be correspondingly connected with the auxiliary sounding layer 2 by adopting a screw connection or magnetic attraction bonding mode.

When adopting plastics as sounding cavity shell 3, plastic material's casing is favorable to guaranteeing the casing shape, can adopt the higher plastics material of transparency, for example inferior gram material, when adopting higher plastics of transparency as sounding cavity shell 3, the quality control of being convenient for and after-sales maintenance, staff's accessible plastics casing audio-visual observes and overhauls the first piezoelectricity excitation unit 4 that sets up in sounding cavity 5. When the plastic material is adopted as the sounding cavity shell 3, the sounding cavity shell can be correspondingly connected with the auxiliary sounding layer 2 by adopting a double faced adhesive tape attaching or screw connecting mode.

When kraft paper is adopted as the sounding cavity shell 3, the kraft paper is light due to dead weight, a resonance effect is easy to form, the whole weight of the sounding screen can be well reduced, and the market competitiveness of the product is improved. Meanwhile, kraft paper has the advantages of stable heat transfer performance, no fluctuation and moderate heat transfer rate. When kraft paper is adopted as the sounding cavity shell 3, the kraft paper can be correspondingly connected with the auxiliary sounding layer 2 in a double-sided bonding connection mode.

In some possible embodiments, the connection mode of the sounding cavity housing 3 and the auxiliary sounding layer 2 may adopt a mode of double faced adhesive tape lamination, screw connection, magnetic attraction lamination, etc. The connection mode of the specific sounding cavity shell 3 and the auxiliary sounding layer 2 can be adaptively adjusted according to the material, parameters and the material of the sounding cavity shell 3 of the actual auxiliary sounding layer 2, so long as the sounding requirement is met under the premise of ensuring the connection strength.

In some embodiments, the shape of the first piezoelectric excitation unit 4 is the same as the cross-sectional shape of the sound emitting cavity housing 3. As shown in fig. 4, the cross-sectional shapes of the first piezoelectric excitation unit 4 and the sounding cavity casing 3 are square. It can be understood that the cross-sectional shapes of the first piezoelectric excitation unit 4 and the sounding cavity housing 3 with the same shape are set, taking square as an example, the edge positions of the four sides of the first piezoelectric excitation unit 4 are the same as the distance between the sounding cavity housing 3, so that when the first piezoelectric excitation unit 4 is electrified and vibrated, air vibration between the sounding cavity housing 3 and the edge of the first piezoelectric excitation unit 4 is better driven, and interference phenomenon caused by different distances in vibration is avoided.

Of course, the shape of the piezoelectric excitation unit 4 may be a circle or other shapes, and when the piezoelectric excitation unit 4 is arranged in a circle, the sounding cavity casing 3 with a cylindrical structure is correspondingly arranged. The shapes of the piezoelectric excitation unit 4 and the sounding cavity housing 3 can be adaptively adjusted according to the sounding requirements of the sounding screen.

In some embodiments, the sounding cavity housing 3 may also be a closed structure, such as a closed hollow cuboid, and one side of the sounding cavity housing 3 is mounted on the second skin 22 far from the membrane. In order to enable the first piezoelectric excitation unit 4 to transmit vibrations better when vibrating, the material of the sound generating cavity housing 3 may also be the same as the material of the second skin 22.

In some embodiments, the sound-producing screen further includes a bezel 7, as shown in fig. 4, where the bezel 7 is disposed around the membrane and the outer periphery of the auxiliary sound-producing layer 2. For example, the frame 7 may be an annular frame body matching with the shape of the composite diaphragm structure formed by the diaphragm and the auxiliary sounding layer 2, and may surround the outer peripheral portions of the diaphragm and the auxiliary sounding layer 2, where the thickness of the frame 7 is greater than or equal to the sum of the thicknesses of the display function layer 1, the auxiliary sounding layer 2, the adhesive layer 6 and the sealing layer. The frame 7 can protect the diaphragm and the auxiliary sounding layer 2 from damage of the external environment on the outer periphery of the diaphragm and the auxiliary sounding layer 2. And the integral structure of the sounding screen can be enhanced, and the firm effect is improved. Wherein, the material of the frame 7 comprises at least one of plastics, carbon fiber, metal and the like.

In some embodiments of the present application, as shown in fig. 4, the sound emitting screen further includes a shock absorbing layer 8. After the membrane and the auxiliary sounding layer 2 are bonded into a whole through the bonding layer 6, the shock absorption layer 8 is arranged around the bonded whole, so that the shock absorption layer 8 plays a role in shock absorption. The material of the shock absorbing layer 8 may be at least one of various damping materials such as butyl rubber, polyurethane foam, polyvinyl chloride, and epoxy resin.

In some embodiments, because the sounding cavity 5 protrudes outwards, in order not to increase the overall thickness of the projection television and affect the appearance, two sounding cavity mounting grooves may be disposed at the corresponding positions of the sounding cavity 5 on the shock-absorbing layer 8, and a frame is mounted on the peripheral wall surface of the shock-absorbing layer 8, so that each functional layer inside is protected by the frame 7. The sounding screen also comprises a suspension bracket, one side of the suspension bracket is fixed on the wall through a screw, and the top end of the suspension bracket is fixed with the screen frame through a damping layer. The sound screen is mounted on the wall by a suspension bracket.

In some embodiments, the sounding cavity housing 3 may be further formed by enclosing the frame 7, the second skin 22 and the hanging surface, in the sounding cavity housing 5, the first piezoelectric excitation unit 4 may be mounted on the second skin 22 of the auxiliary sounding layer 2 in a fitting manner, and the first piezoelectric excitation unit 4 realizes sounding by driving the frame 7 and the air column in the sounding cavity housing 5.

As shown in fig. 16, in order to improve the stability when installing the frame 7, the sound-producing screen may further include a vertical beam, where two ends of the vertical beam are installed at the upper and lower ends of the frame 7, and the vertical beam may divide the frame 7 into left and right parts at this time, so that left and right sound-producing cavities 3 are formed with the second skin 22 and the hanging surface, and the sound intensities of the corresponding parts of the left and right channels may be respectively enhanced.

According to the sounding screen and the projection television provided by the application, the sounding cavity shell 3 is arranged on one side, far away from the membrane of the display function layer 1, of the auxiliary sounding layer 2, and the sounding cavity shell 3 and the auxiliary sounding layer 2 can be encircled to form the sounding cavity 5 so as to be used for sounding. The first piezoelectric excitation unit 4 is arranged inside the sound generating cavity 5, so that the first piezoelectric excitation unit 4, the auxiliary sound generating layer 2 and the sound generating cavity shell 3 can form a resonant cavity, the air column inside the sound generating cavity 5 is driven to vibrate when the first piezoelectric excitation unit 4 vibrates, sound is amplified through resonance, the effect of increasing sound intensity is achieved, and the bass effect is improved. Meanwhile, the first piezoelectric excitation unit 4 is light in self-weight, so that the dead weight of the sounding screen can be effectively reduced by arranging the first piezoelectric excitation unit 4, and the effect of reducing the weight of the sounding screen is achieved.

The embodiment of the present application also provides a projection television, which includes the sound emitting screen provided by any of the above embodiments, so that the projection television has the beneficial technical effects of any of the above embodiments, which are not described herein.

In some embodiments, the projection television further comprises a projection device, wherein the projection device is configured to project a projection screen to the sound-emitting screen, and wherein the sound-emitting screen is configured to display the projection screen of the projection device.

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:

displaying a functional layer; the display function layer comprises a membrane;

The auxiliary sounding layer is provided with at least one sounding cavity shell at one side far away from the membrane, and the sounding cavity shell and the auxiliary sounding layer are laminated to form a sounding cavity;

the first piezoelectric excitation unit is arranged in the sounding cavity, so that the resonance cavity is formed by the first piezoelectric excitation unit, the auxiliary sounding layer and the sounding cavity shell.

2. The sound-emitting screen of claim 1, wherein the auxiliary sound-emitting layer comprises a first skin, a second skin, and an intermediate layer, the intermediate layer being disposed snugly between the first skin and the second skin; the intermediate layer includes a honeycomb core composed of a plurality of cell cells, a support structure of the honeycomb core being perpendicular to the first skin and the second skin.

3. The sound emitting screen of claim 1, further comprising a shock absorber layer and a suspension bracket; the damping layer is arranged on one side of the auxiliary sounding layer, which is far away from the diaphragm; one end of the suspension bracket is arranged on the hanging surface, and the other end of the suspension bracket is fixed with the damping layer.

4. The sound-emitting screen of claim 3, further comprising a bezel circumferentially disposed about the diaphragm and an outer periphery of the auxiliary sound-emitting layer; the sounding cavity shell is formed by surrounding the frame, the second skin and the hanging surface.

5. The sound production screen of claim 1, wherein the sound production cavity shell and the auxiliary sound production layer are connected in one of a double faced adhesive tape bonding mode, a screw connection mode or a magnetic attraction bonding mode; the installation mode of the first piezoelectric excitation unit and the sounding cavity is double faced adhesive tape lamination or magnetic attraction lamination.

6. The sound-emitting screen of claim 1, wherein the first piezoelectric excitation unit is disposed on a skin layer side of the auxiliary sound-emitting layer, or the first piezoelectric excitation unit is disposed on a side of the sound-emitting cavity housing away from the diaphragm, or the first piezoelectric excitation unit is disposed in the middle of the sound-emitting cavity housing.

7. The sound generating screen of claim 6, further comprising a first connection mechanism and a second connection mechanism, wherein one end of the first connection mechanism is connected to the first piezoelectric excitation unit, the other end of the first connection mechanism is connected to the top of the sound generating cavity housing, one end of the second connection mechanism is connected to the first piezoelectric excitation unit, and the other end of the second connection mechanism is connected to the bottom of the sound generating cavity housing.

8. The sound emitting screen of claim 1, further comprising a second piezoelectric excitation unit located in an upper region of the auxiliary sound emitting layer and a first piezoelectric excitation unit located in a lower region of the auxiliary sound emitting layer.

9. The sound emitting screen of claim 1, further comprising an adhesive layer; the bonding layer is positioned between the auxiliary sounding layer and the membrane, so that the auxiliary sounding layer and the membrane are bonded to form a composite vibrating diaphragm structure.

10. A projection television, characterized in that the projection television comprises a projection device and the sound-emitting screen according to any one of claims 1 to 9, the projection device is used for projecting a projection picture onto the sound-emitting screen, and the sound-emitting screen is used for displaying the projection picture projected by the projection device.