CN118112877A

CN118112877A - Projection screen and projection display equipment

Info

Publication number: CN118112877A
Application number: CN202310196407.5A
Authority: CN
Inventors: 戴洁; 杨飞; 邢哲; 王瑶瑶
Original assignee: Qingdao Hisense Laser Display Co Ltd
Current assignee: Qingdao Hisense Laser Display Co Ltd
Priority date: 2022-11-30
Filing date: 2023-03-02
Publication date: 2024-05-31
Also published as: CN118112876A; CN118112874A; CN118112879A; CN118112878A; CN118112873A; CN118112875A

Abstract

The application provides a projection screen and projection display equipment, the said projection screen includes the sound-producing screen with sound-producing diaphragm, the sound-producing screen is used for displaying the image projected by projector; the frame is connected with the periphery of the sound emitting screen; the piezoelectric ceramic plates are arranged on the sound emitting screen, are arranged in a plurality of sound emitting cavities formed by enclosing at least the sound emitting vibrating diaphragm, are identical in structure, are identical in specification and form a sound emitting unit in cooperation with the sound emitting cavities, and generate a plurality of sound emitting areas on the sound emitting vibrating diaphragm. Because the sounding frequency bands corresponding to the same piezoelectric ceramic plates are the same, but the distribution of the freedom degree of the screen is different, the amplitudes of different areas of the screen are also different, so that the sounding frequency bands of sounding units at different positions are different, and the loudness of the corresponding frequency bands is improved through the cavity.

Description

Projection screen and projection display equipment

The present application claims priority from the chinese patent application of application number 202211525290.2 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 technologies, and in particular, to a projection screen and a projection display device.

Background

The projection display 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 display 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 display equipment with the screen sounding function mainly comprises a plate-type projection screen and an electromagnetic exciter arranged on the plate-type projection screen, and the plate-type screen is driven to vibrate through 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 electromagnetic exciter, and the electromagnetic exciter is characterized in that the vibration amplitude is large, so that when the electromagnetic exciter is applied to the plate-type projection screen, vibration limiting and fixing are needed to be carried out on the plate-type projection screen and the electromagnetic exciter respectively, wherein the limiting of the plate-type projection 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.

However, with the continual pursuit of users for product miniaturization, portability, diversity, and flexibility, flexible projection screens are becoming increasingly popular. The electromagnetic exciter has large amplitude and self weight, and compared with the plate-type projection screen, the flexible projection screen has higher degree of freedom, so that good limit and fixation of the electromagnetic exciter cannot be realized, and the flatness of the flexible projection screen cannot be ensured. In addition, the amplitude of the electromagnetic exciter is larger, so that the flexible projection screen is driven to generate larger fluctuation, and the display effect of the flexible projection screen cannot be ensured.

In view of this, how to provide a sound generating scheme adapted to a flexible projection screen is a problem to be solved.

Disclosure of Invention

The embodiment of the application provides a projection screen and projection display equipment, which can enable the projection screen to have better sound effect, realize sound production of the projection screen, avoid the situation that the projection screen is damaged due to the heavy weight of an electromagnetic exciter and reduce the dead weight of the projection screen.

In a first aspect, an embodiment of the present application provides a projection screen, including: the sound generating screen is used for displaying images projected by the projector and is provided with a sound generating vibrating diaphragm;

The frame is connected with the periphery of the sound generating screen;

The piezoelectric ceramic plates are arranged on the sound generating screen, the piezoelectric ceramic plates are arranged in the sound generating cavities, the structures of the sound generating cavities are identical, the specifications of the piezoelectric ceramic plates are identical, the piezoelectric ceramic plates and the sound generating cavities are matched to form a sound generating unit, and the sound generating unit is arranged on the sound generating diaphragm to generate a plurality of sound generating areas.

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

In some embodiments of the present application, the plurality of sound generating cavities are all disposed at edge positions of the sound generating screen, or the plurality of sound generating cavities are all disposed at edge positions of the sound generating area.

In some embodiments of the present application, the sound generating chambers are respectively disposed at a middle position and an edge position of the sound generating screen; or a plurality of sounding cavities are respectively arranged at the middle position and the edge position of the sounding area.

Because the distribution of the freedom degree of the screen is different, the amplitudes of different areas are also different, and therefore, under the condition that the piezoelectric ceramic plates generate the same amplitude, the piezoelectric ceramic plates are placed around the screen, the amplitude generated by the corresponding vibrating diaphragm is smaller, and the loudness of a high frequency range can be improved; the vibration amplitude generated by the corresponding vibrating diaphragm is larger when the vibration amplitude is placed in the center of the screen, and the low-frequency loudness can be improved. The device is placed at the middle position and the edge position of the screen, and can improve the low-frequency loudness and the high-frequency loudness, thereby realizing the frequency band broadening.

And the screen can be partitioned, and the sounding cavity is arranged at the middle position or the edge position of different areas, so that the partition effect is improved.

In some embodiments of the present application, the piezoelectric ceramic sheet includes at least one structure of a single-layer piezoelectric ceramic sheet, a multi-layer piezoelectric ceramic sheet, an inorganic piezoelectric ceramic sheet, and an organic piezoelectric ceramic sheet. Based on the various different structural components of the piezoelectric ceramic plates, the sound emitted by the sound emitting area corresponding to the sound emitting unit can have different frequency bands, so that the sound emitting screen has a wider frequency band selection range, and the projection screen formed by the piezoelectric ceramic plates with different structures can be selectively set to be of different structures, thereby meeting the personalized requirements of users.

In some embodiments of the present application, one of the sound emitting cavities is provided with one of the piezoelectric ceramic plates, or one of the sound emitting cavities is provided with a plurality of the piezoelectric ceramic plates. When each piezoelectric ceramic piece corresponds to a plurality of sound generating cavities, the frequency range of sound of the sound generating screen can be expanded, and the sound loudness of each frequency range can be improved; when each piezoelectric ceramic piece corresponds to one sound generating cavity, the structure of the product can be simplified while the full-frequency-band sound generation and the sound loudness of the sound generating screen are ensured, and the production and assembly difficulty of the product is reduced.

In some embodiments of the present application, the spacing between any two adjacent piezoelectric ceramic plates is equal. The mode that this kind of piezoceramics piece equipartition set up can make the sound production screen have more even sound production effect, makes the user can follow each position perception sound.

In some embodiments of the present application, the sound emitting screen includes: a first adhesive layer;

A second adhesive layer;

A third adhesive layer;

Displaying a functional layer;

The display function layer is attached to the auxiliary sound production layer through the first adhesive layer, the auxiliary sound production layer is provided with a through hole, the piezoelectric ceramic piece penetrates through the through hole and is attached to one side, close to the auxiliary sound production layer, of the display function layer through the first adhesive layer, and the display function layer forms the sound production vibrating diaphragm;

or the display functional layer is attached to the auxiliary sounding layer through the first adhesive layer, the piezoelectric ceramic piece is attached to one side, far away from the display functional layer, of the auxiliary sounding layer through the second adhesive layer, and the display functional layer is attached to the auxiliary sounding layer to form the sounding vibrating diaphragm;

Or the display functional layer is partially attached to the auxiliary sounding layer through the first adhesive layer, the piezoelectric ceramic piece is positioned between the display functional layer and the auxiliary sounding layer and attached to one side, close to the auxiliary sounding layer, of the display functional layer through the first adhesive layer, and the display functional layer forms the sounding diaphragm;

Or the piezoelectric ceramic piece is attached to the backlight surface of the display functional layer through the third adhesive layer, and the display functional layer forms the sounding vibrating diaphragm.

Through carrying out different designs to the structure of sound production screen, can make sound production vibrating diaphragm constitute by different parts in the sound production screen respectively, and because the difference of sound production vibrating diaphragm specific structure, the sound that sound production screen sent also can have the difference. The sounding diaphragm can be selectively arranged, so that the projection screen has good environment adaptability, and the projection screen can be adapted to different scenes by changing the constitution of the sounding diaphragm, so that better sound effects can be exerted in different scenes.

In some embodiments of the present application, the sound emitting screen further includes:

A fourth adhesive layer;

The cavity shell is attached to the display functional layer through the fourth adhesive layer, and the display functional layer and the cavity shell are enclosed to form the sounding cavity;

Or the cavity shell is attached to the auxiliary sounding layer through the fourth adhesive layer, and the auxiliary sounding layer and the cavity shell are enclosed to form the sounding cavity;

Or the cavity shell is attached to the auxiliary sounding layer through the fourth adhesive layer, and the cavity shell shields the through hole and encloses the display functional layer to form the sounding cavity.

Through the setting of cavity shell for cavity shell and sound production vibrating diaphragm are formed with the sound generation chamber that corresponds with piezoceramics piece, borrow the existence of borrow sound generation chamber, can make the piezoceramics piece that is arranged in sound generation chamber arouse the air vibration in sound production vibrating diaphragm and the sound generation chamber, thereby realize the aversion of sound frequency channel, make sound production screen have good high bass audio.

In some embodiments of the application, the frame comprises: an inner frame having a flange remote from the sound emitting screen; the outer frame is used for wrapping the inner frame; the flange is attached to the hanging surface, and the hanging surface and the auxiliary sounding layer form the sounding cavity; or the flange is attached to the hanging surface, and the hanging surface and the display functional layer are enclosed to form the sound generating cavity.

The frame that comprises inside casing and frame realizes the fixed of sound generating screen through the inside casing on the one hand, and on the other hand promotes projection screen overall structure's stability through the frame. In addition, the sound generating cavity is formed by surrounding the sound generating screen and the external wall body through the arrangement of the upper flange of the inner frame, so that the structure of the sound generating cavity can be simplified on the basis of ensuring the stable structure of the projection screen, and the improvement of the production assembly efficiency of products is facilitated.

In some embodiments of the application, the frame further comprises: the shock-absorbing layer is arranged at the joint of the flange and the hanging surface and is used for buffering the projection screen. The buffer space is formed between the projection screen and the hanging surface when the projection screen is interfered by external force, so that the damage to the projection screen is reduced to the greatest extent through the absorption of the buffer layer to vibration, and the improvement of the service life of the product is facilitated.

In a second aspect, embodiments of the present application also provide a projection display device comprising a laser projector and a projection screen as described above; the laser projector is in communication connection with the projection screen.

Due to the adoption of the technical scheme, the technical scheme provided by the application at least has the following beneficial effects:

According to the projection screen provided by the embodiment of the application, the sounding of the projection screen is realized by matching the plurality of piezoelectric ceramic plates and the plurality of sounding cavities which are arranged on the sounding screen, the whole structure is simple, the projection screen is lighter and thinner, and compared with an electromagnetic exciter, the piezoelectric ceramic plates have smaller mechanical vibration on the projection screen. In addition, through setting up piezoceramics piece in the sound generating cavity, borrow the influence of sound generating cavity to the sound frequency channel, can make the sound loudness of specific frequency channel that specific piezoceramics piece excitation sound generating vibrating diaphragm produced promoted. And the structural compositions of the piezoelectric ceramic piece and the sound generating cavity are the same, so that sound generated by the sound generating screen has various different frequency bands, and the sound can be shifted in the different frequency bands. The piezoelectric ceramic plates and the sounding cavities are matched to form sounding units to independently sound, the sounding units generate a plurality of sounding areas on the sounding vibrating diaphragm, so that different frequency bands can be presented by using the same piezoelectric ceramic plates and the same sounding cavities in the same screen, the full-frequency-band loudness of the sounding screen is improved, the sounding effect of the full frequency band is realized, the sound generated by the projection screen has wider frequency band and better high-low sound effect, and the audio-visual experience of a user is improved.

The embodiment of the application also provides projection display equipment, which enables a user to receive wider frequency band sound in the process of watching the video through the full frequency band sounding effect brought by the projection screen, thereby adding the feeling of being on the scene and greatly pleating the video watching experience of the user.

Drawings

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

fig. 2 is a schematic structural diagram of a display function layer according to an embodiment of the present application;

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

FIG. 4 is an exploded view of one of the projection screens provided by embodiments of the present application;

FIG. 5 is a second exploded view of a projection screen according to an embodiment of the present application;

FIG. 6 is a third exploded view of a projection screen according to an embodiment of the present application;

FIG. 7 is a schematic diagram of a projection screen according to an embodiment of the present application;

FIG. 8 is a schematic view of a frame according to an embodiment of the present application;

FIG. 9 is a schematic diagram of the distribution of sound generating cavities provided by an embodiment of the present application;

FIG. 10 is a schematic diagram of a piezoelectric ceramic piece according to an embodiment of the present application;

FIG. 11 is a schematic view of another piezoelectric ceramic wafer placement location according to an embodiment of the present application;

FIG. 12 is a schematic view of a piezoelectric ceramic wafer placement position according to another embodiment of the present application;

FIG. 13 is a schematic view of an elastic connector according to an embodiment of the present application;

fig. 14 is a schematic structural diagram of an auxiliary sounding layer of a projection screen according to an embodiment of the present application.

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 projection screen provided by the embodiment of the application can be applied to various types of projectors. The projector is a device capable of projecting images or videos on a screen, and can play corresponding video signals through different interfaces in connection 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, DV and the like. Projectors are widely used in homes, offices, schools, entertainment venues, etc., including laser projectors, CRT (Cathode Ray Tube) projectors, LCD (Liquid CRYSTAL DISPLAY) projectors, DLP (DIGITAL LIGHT Processing) projectors, etc.

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

In some embodiments, referring to fig. 1, the present application provides a projection display device including a projection screen and a laser projector, wherein the projection screen is fixed at a first position, and the projector is placed at a second position so that a picture projected by the projector coincides with the projection screen. The laser projector 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 laser projector comprises a laser component and an optical lens component, and a light beam emitted by the laser component can penetrate through the optical lens component 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 laser projector 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 laser projector may also be implemented by an LED (LIGHT EMITTING Diode) light source.

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

In some embodiments, the laser projector 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), a ROM (Read-Only Memory), a first to nth interface for input/output, a communication Bus (Bus), and the like.

In some embodiments, the laser projector may be configured with a camera for cooperating with the laser projector to effect regulatory control of the projection process. For example, the laser projector configured camera 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 images and play contents presented by a screen corresponding to the laser projector, namely the projection surface, and the images or the play contents are projected by a light machine built in the projection equipment.

When the laser projector moves to a position, the projection angle and the projection plane distance of the laser projector are changed, so that the projection image is deformed, and the projection image is displayed as a trapezoid image or other malformed images; the laser projector 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.

In some embodiments, the projection screen is a screen capable of emitting sound, and is applied to a projection display device for displaying a projection picture projected by a laser projector. Referring to fig. 2, fig. 2 is a schematic structural diagram of a display function layer according to an embodiment of the application. In some embodiments, as shown in FIG. 2, the projection screen includes a display function layer, i.e., a visualization layer that carries an optical film. 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 coloured layer 2, a diffusing layer 3, a fresnel micro-lens layer 4, a reflecting layer 5 and a support structure 6. In the projection process, light emitted by the ultra-short focal projection equipment is refracted, enters the display functional layer, is reflected by the Fresnel micro lens layer 4 and then exits from the surface layer 1, finally enters human eyes, and is passively developed. Wherein the back side of the fresnel microlens layer 4 is coated with an aluminum reflective layer.

Currently, projection screens can be classified into a panel type projection screen and a flexible projection screen according to their own structures. The panel projection screen mainly comprises a display functional layer with a diaphragm, an adhesive layer, an auxiliary sounding layer, a frame, a cover plate, a suspension bracket, a shock absorption layer, an electromagnetic exciter and the like, wherein the display functional layer is used for displaying a projection picture, the display functional layer, the adhesive layer, the auxiliary sounding layer, the shock absorption layer and the electromagnetic exciter are sequentially connected to form a sounding screen, and the frame, the cover plate and the suspension bracket are of supporting structures and are used for fixing the sounding screen. Flexible projection screens typically include a display function layer having a membrane, an auxiliary sound-emitting layer, and a frame. If the electromagnetic exciter is directly applied to the flexible projection screen, the electromagnetic exciter is light and thin due to the heavy weight of the electromagnetic exciter, and the auxiliary sounding layer cannot support and fix the electromagnetic exciter, and cannot sound the flexible projection screen.

The piezoelectric ceramic plate has the characteristics of light weight, thin thickness, low power consumption, small amplitude and the like, and has excellent medium-high frequency tone. The sounding principle of the piezoelectric ceramic piece is as follows: the piezoelectric ceramic piece that laminates in sound production vibrating diaphragm can produce reverse piezoelectric effect after the circular telegram, converts the electric energy into mechanical deformation to self can warp along the direction of ceramic material layer in the piezoelectric ceramic piece, then drives sound production vibrating diaphragm syntropy vibration, and the sound wave in the sound production vibrating diaphragm radiates away in order to realize the sound production. The bonding mode between the piezoelectric ceramic piece and the sounding vibrating diaphragm can be complete bonding or incomplete bonding, and only a stable connection point is formed between the piezoelectric ceramic piece and the sounding vibrating diaphragm. It can be appreciated that the closer the piezoelectric ceramic piece is bonded to the sounding diaphragm, the less noise in the sound it emits.

When the piezoelectric ceramic plate is applied to the flexible projection screen, on one hand, the piezoelectric ceramic plate is simple in structure, so that the piezoelectric ceramic plate can be fixed by selecting a proper adhesive material, and the fixation is realized without the need of matching structures such as a frame, a cover plate and the like an electromagnetic exciter, so that the projection screen with the sounding structure is lighter in dead weight, simpler and more convenient in processing and overhaul processes, and the reduction of product cost is facilitated; on the other hand, when the ceramic material layers in the piezoelectric ceramic sheet are fewer, the sounding frequency band is narrower, and the sounding frequency band is biased to high frequency; when the ceramic material layers in the piezoelectric ceramic plates are more, the sounding frequency band is widened, and the sounding frequency band is biased to low frequency; therefore, expansion of the sounding frequency band can be achieved by selecting piezoelectric ceramic plates with different numbers of ceramic material layers. In order to ensure that sound has a wider frequency band and better loudness, the embodiment of the application further improves the sounding loudness of the piezoelectric ceramic plate through the arrangement of the sounding cavity, so that the frequency response curve corresponding to the sound finally emitted by the projection screen is in the target range.

The target range refers to a range in which the frequency band corresponding to sound is wide enough and the loudness is uniform enough in a frequency response curve with the frequency band on the abscissa and the loudness on the ordinate, for example, the frequency band is 60-18000Hz, and the difference of the loudness is 10-20 dB.

In view of this, the embodiment of the application uses the piezoelectric ceramic plate as an excitation source, and combines the sound-producing structure based on the piezoelectric ceramic plate with the flexible projection screen with different structures, thereby realizing sound production of the flexible projection screen, and further meeting the personalized demands of users to the greatest extent.

According to the projection screen provided by the embodiment of the application, the sound production of the flexible projection screen is realized through the piezoelectric ceramic plates arranged on the sound production screen, the whole structure is simple, and the projection screen is lighter and thinner. Compared with the mode of using an electromagnetic exciter as an excitation source, the embodiment of the application uses the piezoelectric ceramic plate as the excitation source, and the piezoelectric ceramic plate has smaller weight compared with the electromagnetic exciter, so that the sounding structure can be suitable for flexible projection screens with various structures. In addition, compared with an electromagnetic exciter, the piezoelectric ceramic plate has smaller mechanical vibration generated by the projection screen, so that when the piezoelectric ceramic plate is fixed in a bonding mode, the bonding between the piezoelectric ceramic plate and the auxiliary sounding layer or the display functional layer is tighter, the situation that the piezoelectric ceramic plate and the auxiliary sounding layer or the display functional layer are possibly subjected to glue spreading due to stress fatigue and the like is reduced, and the self structural stability of the projection screen is guaranteed.

According to the embodiment of the application, the sound emitting cavity and the piezoelectric ceramic plates are arranged at different positions in the sound emitting screen, so that the projection screen can not only realize sound frequency band broadening, but also promote the loudness of sound in different frequency bands. For example, since the degrees of freedom of the projection screen are distributed differently, such as a film, the middle has the best elasticity and the largest vibration amplitude, so that the amplitudes of different areas of the projection screen are different, the sounding frequency bands of different areas are different, and the sounding cavities are arranged in different areas at this time, so that the loudness of the corresponding frequency band can be improved.

Referring to fig. 3 and 4, an embodiment of the present application provides a projection screen including a sound emitting screen 100, a frame 200, a plurality of piezoelectric ceramic plates 310, and a plurality of sound emitting cavities 300.

The sound emitting screen 100 has a sound emitting diaphragm for displaying an image projected by a projector. The frame 200 is connected to the periphery of the sound emitting screen 100, a plurality of piezoelectric ceramic plates 310 are disposed on the sound emitting screen 100, the piezoelectric ceramic plates 310 are disposed in the sound emitting chambers 300, the sound emitting chambers 300 have the same structure, and the piezoelectric ceramic plates 310 have the same specification. The piezoelectric ceramic piece 310 is used for exciting the vibration of the sounding vibrating diaphragm in the deformation process, and the air column in the sounding cavity 300 is driven to vibrate by the vibration of the sounding vibrating diaphragm, so that sounding units are formed by matching the piezoelectric ceramic piece 310 and the sounding cavity 300 to independently sound, and due to different distribution of the freedom degrees of the screen, sounding frequency bands of the sounding units in different positions are different, a plurality of sounding units can generate a plurality of sounding areas on the sounding vibrating diaphragm, so that the effect of sounding and frequency band displacement of multiple frequency bands is realized.

In the embodiment of the application, the plurality of piezoelectric ceramic plates 310 and the plurality of sound generating cavities 300 are arranged at different positions of the sound generating screen, so that different frequency bands can be displayed in the same screen by using the same piezoelectric ceramic and the same sound generating cavity, and vibration mode fitting is realized by different partition designs and matching of the cavities and the piezoelectric ceramic plates, so that full-frequency band sound is realized. Meanwhile, the combination of the piezoelectric ceramic piece and the screen realizes certain eigenfrequency, the setting of the cavity realizes the shift of the frequency band, and the full-frequency band sounding frequency is realized through the combination of the piezoelectric ceramic piece and the screen.

In some embodiments, the sound emitting diaphragm may be a single diaphragm, i.e., the sound emitting screen 100 acts as the sound emitting diaphragm. The sound emitting screen 100 may be an optical film, fresnel film, etc., or may be a solid film (e.g., cloth), or may be a spectrally selective paint, black-grid film, white plastic screen, etc. The sounding diaphragm can be used as a diaphragm for projection display or a diaphragm for sounding. The number of layers in a single diaphragm for optical films, fixed films, spectrally selective coatings, black-grating films, white plastic curtains, etc. is not limited, and only the same type of material or structure is required.

It should be noted that when the sounding diaphragm is formed by the fresnel diaphragm, although the fresnel diaphragm may be formed by a multilayer structure, projection can be achieved without compounding with other materials, and sounding can be achieved by attaching the piezoelectric ceramic sheet to the fresnel diaphragm.

In some embodiments, the sound-emitting diaphragm may also be a composite diaphragm, that is, a glue layer, an adhesive film, etc. is coated on the sound-emitting screen 100, so that the sound-emitting screen 100 is overlapped to form the composite diaphragm. That is, a glue layer, a glue film, may be coated on the display function layer 110. The sounding diaphragm can be set as a composite diaphragm because the vibration mode of one diaphragm is less and the sound effect is poor, so that the vibration mode is increased to improve the sound effect. At this time, if the sounding diaphragm is formed by compounding multiple layers, the natural frequency of the sounding diaphragm can be changed, so that the audio frequency band broadening is realized.

The number of layers of the coating layers such as the glue layer, the glue film and the like in the composite diaphragm is not limited. The composite coating layer is equivalent to adding a vibrating diaphragm which is made of materials different from the sound generating screen 100 on the sound generating screen 100, and the natural frequency of the original sound generating vibrating diaphragm (the sound generating screen 100) is changed by increasing the composite degree of the vibrating diaphragm, so that the frequency response range (the frequency band) is changed, and the frequency band widening of sound is realized.

Referring to fig. 4, the sound emitting screen 100 may include a display functional layer 110, a first adhesive layer 120, a second adhesive layer (not shown), a fourth adhesive layer (not shown), a flexible auxiliary sound emitting layer 130, and a cavity housing 140, where the auxiliary sound emitting layer 130 is attached to the display functional layer 110 through the first adhesive layer 120, that is, the display functional layer 110 is used as the front surface of the sound emitting screen 100, and the auxiliary sound emitting layer 130 is used as the back surface of the sound emitting screen 100. The display function layer 110 is used for reflecting the light beam emitted by the projection host to realize the display of the picture.

Regarding the specific structure of the sound emitting screen and the sound emitting diaphragm, the following will be schematically illustrated with several different examples:

referring to fig. 4, the piezoelectric ceramic piece 310 may be attached to a side of the auxiliary sounding layer 130 away from the display function layer 110 through a second adhesive layer, and the cavity housing 140 is attached to the auxiliary sounding layer 1.30 through a fourth adhesive layer. At this time, the auxiliary sounding layer 130 and the cavity housing 140 enclose to form the sounding cavity 300, and the display functional layer 110 and the auxiliary sounding layer 130 are attached to form the sounding diaphragm, so as to realize frequency band broadening and shifting of different frequency bands.

Referring to fig. 5, a through hole 131 may be disposed on the auxiliary sounding layer 130, the piezoelectric ceramic sheet 310 may pass through the through hole 131 and be attached to a side of the display functional layer 110, which is close to the auxiliary sounding layer 130, through a second adhesive layer, and the cavity housing 140 is attached to the auxiliary sounding layer 130 through a fourth adhesive layer. At this time, the cavity housing 140 may block the through hole 131 and enclose the display function layer 110 to form the sound emitting cavity 300. At this time, the display functional layer 110 forms a sounding diaphragm, the auxiliary sounding layer 130 is used as a load to realize different vibration modes and generate frequency band broadening with different effects, so that displacement of different frequency bands is realized under the action of the cavity.

Referring to fig. 6, the piezoelectric ceramic sheet 310 may be located between the display functional layer 110 and the auxiliary sounding layer 130, where the display functional layer 110 and the auxiliary sounding layer 130 are partially bonded through the first adhesive layer 120, the piezoelectric ceramic sheet 310 is bonded to one side of the display functional layer 110 near the auxiliary sounding layer 130 through the first adhesive layer, and the cavity housing 140 is bonded to the display functional layer 110 through the fourth adhesive layer. At this time, the display functional layer 110 and the cavity housing 140 enclose to form the sound emitting cavity 300, and the display functional layer forms the sound emitting diaphragm to realize different vibration modes.

In some embodiments, the cavity housing 140 may not be provided, but the sound emitting cavity 300 may be defined by the display function layer 110 and the auxiliary sound emitting layer 130. It will be appreciated that in order to enhance the sound effect, the material of the auxiliary sound emitting layer 130 is selected from a gas impermeable material such as a polyester film, a metal film, a polyimide film, etc.

Referring to fig. 7, the piezoelectric ceramic piece 310 may be directly attached to the backlight surface of the display function layer 110 through a third adhesive layer, that is, the auxiliary sounding layer 130 is omitted, and the cavity housing 140 is attached to the display function layer 110 through a fourth adhesive layer. At this time, the display functional layer 110 and the cavity housing 140 enclose to form the sound emitting cavity 300, and the display functional layer 110 forms the sound emitting diaphragm to realize different vibration modes.

In some embodiments, referring to fig. 8, the frame 200 may include an inner frame 210 and an outer frame 220, the inner frame 210 having a flange 211 remote from the sound emitting screen, the outer frame 220 being used to encase the inner frame 210. The flange 211 is connected with the hanging surface, that is, the inner frame of the sound generating screen 100 and the hanging surface form the sound generating cavity 300 during hanging, and a separate cavity shell is not required to be arranged on the piezoelectric ceramic piece. In the arrangement manner of the piezoelectric ceramic piece 310 in the foregoing embodiment, when the flange 211 is connected to the hanging surface, the hanging surface may enclose the auxiliary sound generating layer 130 to form the sound generating cavity 300, or the hanging surface may enclose the display function layer 110 to form the sound generating cavity 300.

In some embodiments, the inner frame and the hanging surface of the sound emitting screen 100 may be used as a secondary sound emitting cavity, i.e. a cavity is further disposed outside the sound emitting cavity, for example, the piezoelectric ceramic sheet 310 is located between the display function layer 110 and the auxiliary sound emitting layer 130, the display function layer 110 and the auxiliary sound emitting layer 130 are enclosed to form the sound emitting cavity 300, the flange 211 is further disposed to be connected with the hanging surface, and the hanging surface and the auxiliary sound emitting layer 130 are enclosed to form the secondary sound emitting cavity, so as to improve sound loudness.

It will be appreciated that although the plurality of sound generating chambers 300 in the embodiment of the present application have the same structure, the plurality of piezoelectric ceramic plates 310 have the same specification, so that the sound frequency bands generated by the projection screen are in the same range in the ideal state. However, due to the frame 200 and the flexible auxiliary sounding layer 130 in the projection screen, the auxiliary sounding layer 130 has high degree of freedom when vibrating relative to the middle position of the sounding screen, and the vibration amplitude generated by the vibration is large and corresponds to low-frequency sounding; the auxiliary sounding layer 130 has low degree of freedom when vibrating relative to the edge position of the sounding screen, and the vibration amplitude is small, which corresponds to the high-frequency sounding. Therefore, the loudness of the high frequency band can be raised when the sound generating cavity 300 is arranged near the edge position, and the loudness of the low frequency band can be raised when the sound generating cavity 300 is arranged near the middle region, so that the actual sound generating frequency band of the projection screen is shifted due to the difference of the positions of the sound generating cavity 300 on the sound generating screen.

The arrangement of the sound generating cavity 300 and the piezoelectric ceramic plate 310 will be described in several different embodiments:

Example 1

The plurality of sound generating cavities 300 are all arranged at the middle position of the sound generating screen 100, or the plurality of sound generating cavities 300 are all arranged at the middle position of the sound generating area, namely, all the sound generating cavities 300 are concentrated at the middle position of the sound generating screen 100, or the plurality of sound generating areas are arranged on the sound generating screen 100, and the plurality of sound generating cavities 300 are respectively arranged at the middle positions of the plurality of sound generating areas. Vibration sound waves with larger amplitude are generated in the middle area through the plurality of sound generating cavities 300, so that the loudness of the low frequency range is improved.

For example, the sound emitting screen 100 includes 3 sound emitting cavities 300 in total, and the 3 sound emitting cavities 300 are arranged in a linear array in a region corresponding to a center line of the sound emitting screen 100. A piezoelectric ceramic plate 310 is disposed in each sound generating cavity 300, that is, the sound generating screen includes 3 piezoelectric ceramic plates 310. The specifications of the 3 piezoelectric ceramic plates are the same, and the power is the same. Thus, the sound emitting screen 100 can vibrate through the 3 piezoelectric ceramic plates to emit sound, and the loudness is raised through the 3 sound emitting cavities 300. Since the sound generating cavity 300 is located in the middle region of the sound generating screen 100, a vibration sound wave with a larger amplitude can be generated, and the low-frequency range loudness can be improved.

Example two

The plurality of sound generating cavities 300 are all arranged at the edge position of the sound generating screen 100, or the plurality of sound generating cavities 300 are all arranged at the edge position of the sound generating area, namely, all the sound generating cavities 300 are concentrated at the edge position of the sound generating screen 100, or the plurality of sound generating areas are arranged on the sound generating screen 100, and the plurality of sound generating cavities 300 are respectively arranged at the edge positions of the plurality of sound generating areas. And vibration sound waves with smaller amplitude are generated in the edge area, so that the loudness of the high frequency band is improved.

For example, the sound emitting screen 100 includes 4 sound emitting cavities 300,4 and 300 located in edge regions of the sound emitting screen 100 (e.g., four corners of the sound emitting screen 100), respectively. The specifications of the piezoelectric ceramic plates 310,4 and 310 in each sound generating cavity 300 are the same, and the power is the same. At this time, after the piezoelectric ceramic sheet 310 is electrically deformed, a vibration sound wave can be generated in the sound generating cavity 300 at the edge area of the sound generating screen 100, and since the sound generating cavity 300 is located at the edge area of the sound generating screen 100, a vibration sound wave with smaller amplitude can be generated, thereby improving the loudness of the high-frequency band.

Example III

The plurality of sound generating cavities 300 are respectively arranged at the middle position and the edge position of the sound generating screen 100, or the plurality of sound generating cavities 300 are respectively arranged at the middle position and the edge position of the sound generating area, namely the sound generating cavities 300 are respectively arranged at the middle area and the edge area of the sound generating screen 100, or the plurality of sound generating areas are arranged on the sound generating screen 100, and the sound generating cavities 300 are respectively arranged at the middle position and the edge position of the plurality of sound generating cavities 300. The sounding cavity 300 located in the middle region may boost the loudness of the low frequency band, while the sounding cavity 300 located in the edge region may boost 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. 9, the sound emitting screen 100 includes 5 sound emitting cavities 300 in total, wherein 4 sound emitting cavities 300 are respectively located at edge regions of the sound emitting screen 100 (e.g., four corners of the sound emitting screen 100), and one sound emitting cavity 300 is located at a center position of the sound emitting screen 100. The specifications of the piezoelectric ceramic plates 310,4 and 310 in each sound generating cavity 300 are the same, and the power is the same. At this time, after the piezoelectric ceramic piece 310 is electrically deformed, vibration sound waves can be generated in the sound generating cavity 300, and since the sound generating cavity 300 is located in the middle area and the edge area of the sound generating screen 100, the sound generating cavity 300 located in the middle area can raise the loudness of the low frequency band, and meanwhile, the sound generating cavity 300 located in the edge area can raise the loudness of the high frequency band, thereby raising the loudness of the low frequency band and the high frequency band.

According to the embodiment of the application, the projection screen in the laser projection display equipment is set to be in the structure under any one of the examples, the display function layer is used for reflecting the light beams emitted by the laser projector so as to realize the display of pictures, and the piezoelectric ceramic plates at different positions are used for exciting the sounding diaphragm to vibrate so as to enable the sounding screen to emit sounds of different frequency bands, so that the sound frequency band range of the sounding screen is expanded; and, through setting up corresponding to the sound generating cavity of piezoceramics piece, further promote the sound loudness of each frequency channel to make projection display equipment have better sound effect, realize the perfect combination of vision and hearing.

In addition, the "specification" of the piezoelectric ceramic plate and the "structure" of the sound generating cavity in the embodiments of the present application do not refer to the self-structure of the piezoelectric ceramic plate or the sound generating cavity, but may also include the material, the size, etc. of the piezoelectric ceramic plate or the sound generating cavity, and may even be other factors that affect the sound effect of the sound generating screen due to the change of some characteristics of the piezoelectric ceramic plate or the sound generating cavity, such as the temperature, the humidity, the type of the sound propagation medium in the sound generating cavity, etc.

For example, when the specifications of the piezoelectric ceramic sheet correspond to the self-construction and the material, the piezoelectric ceramic sheet may be a single-layer piezoelectric ceramic sheet, a multi-layer piezoelectric ceramic sheet, an inorganic piezoelectric ceramic sheet, an organic piezoelectric ceramic sheet, or the like; when the specifications of the piezoelectric ceramic plates correspond to the sizes, the piezoelectric ceramic plates with the length, width and height of 5-60mm,5-60mm and 0.1-1mm can be adopted as the sizes among the piezoelectric ceramic plates.

The structure of the sound generating chamber is not limited to the self-structure of the sound generating chamber, and may include a shape, a chamber material, a chamber size, a connection method with the sound generating screen, a setting method between a plurality of sound generating chambers, and the like. Illustratively, when the structure of the sound emitting cavity corresponds to a shape, it may be circular, square, triangular, or other shape; when the structure of the sound generating cavity corresponds to the cavity material, the cavity can be made of organic materials or inorganic materials; when the structure of the sound generating cavities corresponds to the size, the size among the cavities of each sound generating cavity can be a cavity with the length, width and height of 6-100mm,6-100mm and 0.2-10mm respectively; when the structure of the sound emitting cavity corresponds to the connection mode between the sound emitting cavity and the sound emitting screen, the sound emitting cavity can be bonded (such as glue, double-sided adhesive tape, adhesive film or reworkable adhesive tape, etc.), and can also be welded, etc.

In some embodiments, the piezoelectric ceramic plate 310 and the sound generating cavity 300 are multiple, one piezoelectric ceramic plate 310 is disposed in one sound generating cavity 300, or multiple piezoelectric ceramic plates 310 are disposed in one sound generating cavity 300.

When each piezoelectric ceramic piece corresponds to one sound generating cavity, the sound generated by the vibration of the excitation sound generating vibrating diaphragm of each piezoelectric ceramic piece can be improved through the arrangement of the sound generating cavities, so that the overall sound loudness is expanded. When a sounding cavity is provided with a plurality of piezoelectric ceramic plates, compared with the structure of a plurality of sounding cavities, the structure is simpler, so that the production and assembly difficulty of products is greatly reduced, and the improvement of the production efficiency of the products and the reduction of the cost are facilitated.

In some embodiments, the spacing between any adjacent two piezoceramic sheets 310 is equal. The mode that this kind of equipartition set up can make the sound production screen have more even sound production effect, makes the user can follow each position perception sound. And the piezoelectric ceramic plates 310 can be arranged in a matrix, and the matrix arrangement mode can further improve the uniform sounding effect of the sounding screen.

In addition, the structure of the sound emitting screen can be multiple, and the types of the sound emitting diaphragms also depend on the arrangement positions of the piezoelectric ceramic plates in the sound emitting screen, so that the sound emitting screen can emit different sounds due to the combination of the sound emitting screens with different structures and different types of sound emitting diaphragms.

In this embodiment, regarding the placement of the piezoelectric ceramic plate in the acoustic cavity, there may be the following several different examples:

example IV

Referring to fig. 10, the piezoelectric ceramic plates 310 are disposed between the auxiliary sounding layer 130 and the chamber housing 140, and the piezoelectric ceramic plates 310 are respectively connected with the chamber housing 140 by corresponding connection structures. When the piezoelectric ceramic piece 310 vibrates, the piezoelectric ceramic piece can drive the cavity shell 140 to vibrate through the connecting structure, and the vibration of the cavity shell 140 is transmitted to the auxiliary sounding layer 130, meanwhile, one side, away from the piezoelectric ceramic piece 310, of the auxiliary sounding layer 130 is connected with the display functional layer 110, so that when the auxiliary sounding layer 130 is driven by the piezoelectric ceramic piece 310 to vibrate, the auxiliary sounding layer 130 can transmit the vibration to the display functional layer 110, and the whole of the auxiliary sounding layer 130 and the display functional layer 110 can be used as a vibrating diaphragm to sound.

Example five

Referring to fig. 11, the piezoelectric ceramic sheet 310 is disposed on the auxiliary sound emitting layer 130, that is, the piezoelectric ceramic sheet 310 is directly attached to the auxiliary sound emitting layer 130. When the piezoelectric ceramic piece 310 is attached to the auxiliary sounding layer 130, the piezoelectric ceramic piece 310 is electrified to vibrate and drive the auxiliary sounding layer 130 attached to the piezoelectric ceramic piece to vibrate, and meanwhile, one side, away from the piezoelectric ceramic piece 310, of the auxiliary sounding layer 130 is connected with the display functional layer 110, so that when the auxiliary sounding layer 130 is driven by the piezoelectric ceramic piece 310 to vibrate together, the auxiliary sounding layer 130 can transmit vibration to the display functional layer 110, and the whole of the auxiliary sounding layer 130 and the display functional layer 110 can be used as a vibrating diaphragm to sound. On this basis, the direction of vibration that piezoelectric ceramic piece 310 and sound generation intracavity air column sent out for the first time is deviating from the user, then reflects and changes the direction through cavity shell 140, and cavity shell 140 can also interfere the sound wave simultaneously, absorbs the noise, improves tone quality. The cavity housing 140 of different shapes and materials can absorb noise of different wavelengths to improve sound quality.

Example six

Referring to fig. 12, the piezoelectric ceramic sheet 310 is disposed on the cavity case 140, that is, the piezoelectric ceramic sheet 310 is directly attached to the sidewall of the cavity case 140 opposite to the auxiliary sound emitting layer 130. When the piezoelectric ceramic piece 310 is attached to the cavity shell 140, the piezoelectric ceramic piece 310 is powered on to vibrate and drive the cavity shell 140 attached to the piezoelectric ceramic piece to vibrate, meanwhile, since the cavity shell 140 is mounted on the auxiliary sounding layer 130, when the piezoelectric ceramic piece 310 transfers vibration to the cavity shell 140, the cavity shell 140 transfers vibration to the auxiliary sounding layer 130 again and then to the display function layer 110 connected with the auxiliary sounding layer 130, so that the whole of the display function layer 110, the auxiliary sounding layer 130 and the cavity shell 140 is sounding as a vibrating diaphragm. On this basis, the auxiliary sounding layer 130 and the display function layer 110 are used as diaphragms to realize sounding, and air columns in the sounding cavity vibrate under the action of the piezoelectric ceramic plates 310. The presence of the air column is equivalent to adding load to the diaphragm of the auxiliary sounding layer 130, and can play a role in improving sound intensity.

It should be noted that, the setting position of the piezoelectric ceramic piece 310 can be adaptively adjusted according to the material of the cavity housing 140, the parameters of the sound emitting screen, and the sound emitting requirement.

In some possible embodiments, the cavity housing 140 and the auxiliary sounding layer 130 may be connected by a double-sided adhesive tape, a screw connection, a magnetic attachment, or the like. The connection mode between the cavity shell 140 and the auxiliary sounding layer 130 can be adaptively adjusted according to the material, parameters and the material of the cavity shell 140 of the actual auxiliary sounding layer 130, so long as the sounding requirement is satisfied under the premise of ensuring the connection strength. In some embodiments, the thickness of the cavity housing 140 is less than 1mm in order to enable the cavity housing 140 to produce resonance sound.

In some possible embodiments, the material of the chamber housing 140 may be selected from thin layers of metal, plastic, kraft paper, and the like. When the thin metal is used as the cavity shell 140, the metal shell is favorable for prolonging the service life of the cavity shell 140, and meanwhile, the metal selectivity is wider, and corresponding metal materials can be selected according to different sounding requirements, for example, metals with relatively higher stability, such as copper, can be selected. When the thin metal is selected as the cavity housing 140, the thin metal can be correspondingly connected with the auxiliary sounding layer 130 by adopting a screw connection or magnetic attraction bonding mode.

When the plastic is adopted as the cavity shell 140, the plastic shell is favorable for ensuring the shape of the shell, and plastic materials with higher transparency, such as a sub-power material, can be adopted, and when the plastic with higher transparency is adopted as the cavity shell 140, quality inspection and after-sales maintenance are facilitated, and staff can observe and maintain the piezoelectric ceramic plate 310 arranged in the sound generating cavity through the plastic shell intuitively. When the plastic material is the cavity shell 140, the auxiliary sound layer 130 can be correspondingly connected with the cavity shell by adopting a double-sided adhesive tape bonding or screw connection mode.

When kraft paper is used as the cavity shell 140, the kraft paper is light due to dead weight, so that 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 used as the cavity housing 140, the kraft paper can be correspondingly connected with the auxiliary sounding layer 130 by adopting a double-sided bonding connection mode.

In some embodiments, referring to fig. 3, the frame 200 may be a planar frame 200 or a curved frame 200; the frame 200 may have a ring-shaped structure or a parallel structure without side edges; or the frame 200 may be of a unitary structure or of a split structure; the material of the frame 200 may be metal or plastic, and the specific structure and material of the frame 200 are not limited in the embodiments of the present application.

In some embodiments, referring to fig. 4 and 8, the frame 200 further includes a plurality of vertical beams 213, the plurality of vertical beams 213 may be disposed on the inner frame 210, the plurality of vertical beams 213 are all disposed on the back surface of the display function layer 110, and the plurality of vertical beams 213 may be disposed vertically at equal intervals, thereby supporting the inner frame 210, preventing the inner frame 210 from being deformed, and further improving the strength of the frame 200.

In some embodiments, for frames having flanges 211, frame 200 may further include a shock absorbing layer (not shown) disposed at the connection of the flanges to the external wall for cushioning the projection screen. The damping layer can be any one of foam, elastic rubber, silica gel and latex, and the specific structure and the material of the damping layer are not limited.

In the projection screen provided by the embodiment of the present application, when the auxiliary sounding layer is included in the sound emitting screen, because the auxiliary sounding layer is made of a flexible material, in order to ensure the flatness of the auxiliary sounding layer, the periphery of the sound emitting screen may be connected by a fixing structure, and referring to fig. 13, the sound emitting screen 100 may further include a plurality of elastic connectors 400, where the elastic connectors 400 may include, but are not limited to, elastic belts or springs. Each elastic connection 400 has opposite first and second ends (see a in fig. 13) and b in fig. 13), the first end of each elastic connection 400 is connected to the edge of the auxiliary sound emitting layer 130, and the second end of each elastic connection 400 is connected to the inner frame 210.

Wherein, a plurality of elastic connection pieces 400 all are in tensile state, apply outside power to the edge of supplementary sound production layer 130 to make the sound production vibrating diaphragm that contains supplementary sound production layer 130 flatten, the vibration amplitude of sound production vibrating diaphragm under the effect of piezoceramics piece under the flattening state is more controllable, thereby has improved projection screen's sound production effect, and the display screen that the sound production vibrating diaphragm of flattening can be better.

Referring to fig. 14, when the auxiliary sounding layer 130 is disposed, the edge of the auxiliary sounding layer 130 may extend beyond the edge of the display function layer 110, and a plurality of connection holes 131 are disposed in the edge region of the auxiliary sounding layer 130 extending outside the display function layer 110. Each of the connection holes 131 may be a circular hole, the plurality of connection holes 131 surround the auxiliary sounding layer 130, the plurality of connection holes 131 are in one-to-one correspondence with the plurality of elastic connection pieces 400, and the first end of each elastic connection piece 400 is connected with the peripheral wall of the corresponding connection hole 131.

In some examples, the first end of the elastic connection member 400 may be penetrated into the connection hole 131 and connected with the inner wall of the connection hole 131, thereby being stably connected with the auxiliary sound emitting layer 130.

In other examples, the auxiliary sounding layer 130 is further provided with a plurality of connecting pieces 132, the connecting pieces 132 may be circular rings or eyelet buttons (eyelet buttons are also known as eyelets and shoes, and are shaped into circles, and large-area holes are formed in the middle of the eyelet buttons to play a role of ventilation or rope threading), the plurality of connecting pieces 132 are in one-to-one correspondence with the plurality of connecting holes 131, the outer ring of each connecting piece 132 is connected with the edge of the corresponding connecting hole 131, or a part of each connecting piece 132 wraps the edge of the corresponding connecting hole 131, the first end of each elastic connecting piece 400 is connected with the corresponding connecting piece 132, for example, referring to fig. 13, the first end (a end) of each elastic connecting piece 400 is an annular buckle or an integral connecting ring 410, and the annular buckle is buckled with the connecting piece 132, so that the elastic connecting piece 400 is connected with the auxiliary sounding layer 130, and thus the tensile force of the elastic connecting piece 400 is prevented from directly acting on the connecting hole 131, the edge of the connecting hole 131 is prevented from tearing and damaging the edge of the auxiliary sounding layer 130, the sounding effect of the auxiliary sounding layer 130 is ensured, and the service life of the auxiliary sounding layer 130 is prolonged.

Of course, in other examples, the first end of the elastic connection member 400 may be fixed on the surface of the edge area of the auxiliary sound generating layer 130 by bonding or the like, so as to simplify the connection structure, improve the assembly efficiency of the projection screen, and reduce the weight of the projection screen.

In addition, the second end of each elastic connection member 400 may be connected to the inner frame 210, the outer frame 220 and the inner frame 210 may be square frames 200, and the cross sections of the outer frame 220 and the inner frame 210 may be two opposite L-shapes, so that the outer frame 220 and the inner frame 210 may be surrounded by an annular groove having a certain width and depth, the width of the annular groove should be greater than that of the elastic connection member 400, and the length of the annular groove should be greater than that of the elastic connection member 400, thereby hiding the elastic connection member 400 and improving the aesthetic property of the projection screen according to the embodiment of the present application.

In the specific connection, as shown in fig. 13, a plurality of connection rings 410 may be disposed on the inner frame 210, the plurality of connection rings 410 are in one-to-one correspondence with the plurality of elastic connection members 400, and the second end of each elastic connection member 400 is connected with the corresponding connection ring 410, so that the second end of the elastic connection member 400 is conveniently fixed on the inner frame 210, and further, the assembly of the projection screen according to the embodiment of the present application is convenient.

The connecting ring 410 should have a certain rigidity, not be easily deformed, and may be a metal ring, but is not limited to a metal ring.

Of course, in other examples, the second end of each elastic connection member 400 may be fixed to the surface of the inner frame 210 by bonding or the like, so as to simplify the connection structure, improve the assembly efficiency of the projection screen, and reduce the weight of the projection screen.

It should be further noted that, the numerical values and the numerical ranges related to the embodiments of the present application are approximate values, and may have a certain range of errors under the influence of the manufacturing process, and those errors may be considered to be negligible by those skilled in the art.

Based on the projection screen provided by the foregoing embodiments, the embodiments of the present application further provide a projection display device, where the projection display device includes the sound emitting screen provided by any of the foregoing embodiments, so that the projection display device has the beneficial technical effects described in any of the foregoing embodiments, which are not described herein.

It is to be understood that, based on the several embodiments provided in the present application, those skilled in the art may combine, split, reorganize, etc. the embodiments of the present application to obtain other embodiments, which all do not exceed the protection scope of the present application.

The foregoing detailed description of the embodiments of the present application further illustrates the purposes, technical solutions and advantageous effects of the embodiments of the present application, and it should be understood that the foregoing is merely a specific implementation of the embodiments of the present application, and is not intended to limit the scope of the embodiments of the present application, and any modifications, equivalent substitutions, improvements, etc. made on the basis of the technical solutions of the embodiments of the present application should be included in the scope of the embodiments of the present application.

Claims

1. A projection screen, comprising:

The sound generating screen is used for displaying images projected by the projector and is provided with a sound generating vibrating diaphragm;

The frame is connected with the periphery of the sound generating screen;

2. The projection screen of claim 1 wherein a plurality of sound generating cavities are each disposed at a central location of the sound generating screen or a plurality of sound generating cavities are each disposed at a central location of the sound generating area.

3. The projection screen of claim 1 wherein a plurality of sound generating cavities are each disposed at an edge location of the sound generating screen or a plurality of sound generating cavities are each disposed at an edge location of the sound generating area.

4. The projection screen of claim 1, wherein a plurality of sound generating cavities are provided at a central position and an edge position of the sound generating screen, respectively, or a plurality of sound generating cavities are provided at a central position and an edge position of the sound generating area, respectively.

5. The projection screen of claim 1 wherein one of the sound emitting cavities has one of the piezoelectric ceramic plates disposed therein or a plurality of the piezoelectric ceramic plates disposed therein.

6. The projection screen of claim 1 wherein the sound emitting screen comprises:

A first adhesive layer;

A second adhesive layer;

A third adhesive layer;

Displaying a functional layer;

7. The projection screen of claim 6 wherein the sound emitting screen further comprises:

A fourth adhesive layer;

8. The projection screen of claim 6 wherein the frame comprises:

an inner frame having a flange remote from the sound emitting screen;

The outer frame is used for wrapping the inner frame;

The flange is attached to the hanging surface, and the hanging surface and the auxiliary sounding layer are enclosed to form the sounding cavity; or alternatively

The flange is attached to the hanging surface, and the hanging surface and the display functional layer are enclosed to form the sound generating cavity.

9. The projection screen of claim 8 wherein the frame further comprises:

The elastic connecting pieces are respectively provided with a first end and a second end which are opposite, the first ends of the elastic connecting pieces are respectively connected with the edges of the auxiliary sounding layers, the second ends of the elastic connecting pieces are respectively connected with the inner frame, and the auxiliary sounding layers are stretched to be in a flat state by the pulling force of the elastic connecting pieces.

10. A projection display device comprising a laser projector and a projection screen as claimed in any one of claims 1 to 9;

The laser projector is in communication connection with the projection screen.