CN118112873A - Projection screen and projection display equipment - Google Patents

Abstract

The application provides a projection screen and a projection display device, wherein the projection screen comprises: the sound generating screen is used for displaying images projected by the projector and comprises a display function layer and a flexible auxiliary sound generating layer; the frame is connected with the periphery of the sound production screen; the piezoelectric ceramic piece is attached to the display functional layer, and one surface of the piezoelectric ceramic piece, which is far away from the display functional layer, is attached to the auxiliary sounding layer so as to clamp the piezoelectric ceramic piece between the display functional layer and the auxiliary sounding layer; under the action of periodic voltage, the piezoelectric ceramic piece generates deformation to excite the auxiliary sounding layer and the display functional layer to vibrate in the same direction so as to make sound. According to the application, the sound production of the flexible projection screen is realized through the piezoelectric ceramic plates arranged on the sound production screen, so that the projection screen has better sound effect, the whole structure is simpler, the projection screen is lighter and thinner, and the piezoelectric ceramic plates generate less mechanical vibration on the projection screen.

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 the sound production of a flexible projection screen and avoid the situation that the projection screen cannot be fixed due to the heavy weight of an electromagnetic exciter.

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 comprises a display function layer and a flexible auxiliary sound generating layer; the frame is connected with the periphery of the sound production screen; the piezoelectric ceramic piece is attached to the display functional layer, and one surface of the piezoelectric ceramic piece, which is far away from the display functional layer, is attached to the auxiliary sounding layer; the piezoelectric ceramic piece generates deformation under the action of periodic voltage to excite the auxiliary sounding layer and the display functional layer to vibrate in the same direction.

According to the embodiment of the application, the display function layer and the auxiliary sound-producing layer of the projection screen are bonded into a whole through the adhesive layer to form the sound-producing vibrating diaphragm, the piezoelectric ceramic piece is arranged on the display function layer and the auxiliary sound-producing layer directly to drive the sound-producing vibrating diaphragm to vibrate and produce sound, so that the projection screen can produce sound, the projection screen is simple in integral structure, light and thin in screen, and difficult to vibrate, in addition, the sound-producing vibrating diaphragm with different sound-producing effects is formed through the material selection of the display function layer, the adhesive layer and the auxiliary sound-producing layer, so that the whole projection screen has different frequency band broadening effects, and the sound-producing screen is flattened through the frame connection with the sound-producing screen, so that the projection picture and vibration sound can be displayed conveniently.

In some embodiments, the projection screen further includes a first adhesive layer, and the first adhesive layer covers the display functional layer and is adjacent to the auxiliary sounding layer, and the display functional layer is adhered to the auxiliary sounding layer through the first adhesive layer.

The display function layer is completely covered by the adhesive layer and is close to one side of the auxiliary sounding layer, so that the display function layer is completely attached to the auxiliary sounding layer, the consistency of the density of each position of the sounding diaphragm formed by the display function layer, the adhesive layer and the auxiliary sounding layer is guaranteed, and the consistency of the sounding effect of each position of the sounding diaphragm is guaranteed.

In some embodiments, the projection screen further comprises a second adhesive layer. The piezoelectric ceramic piece is adhered to the display functional layer through the second adhesive layer, and/or the piezoelectric ceramic piece is adhered to the auxiliary sounding layer through the second adhesive layer. The piezoelectric ceramic piece is singly or doubly connected with the display functional layer and the auxiliary sounding layer through the second adhesive layer, so that the display functional layer and the auxiliary sounding layer are driven to vibrate in the same direction, the display functional layer and the auxiliary sounding layer are used as a composite vibrating diaphragm, and the sounding effect of the projection screen is improved.

In some embodiments, the auxiliary sound-producing layer further comprises a mounting hole, wherein the mounting hole is a concave hole or a through hole, and an opening of the mounting hole faces the display functional layer; the piezoelectric ceramic piece is positioned in the mounting hole, and the size of the piezoelectric ceramic piece is consistent with that of the mounting hole.

In some embodiments, the projection screen further comprises a plurality of resilient connectors; the elastic connecting piece includes first end and second end, and the first end and the marginal connection of supplementary sound production layer of elastic connecting piece, and the second end and the frame coupling of elastic connecting piece are used for flattening fixed sound production screen.

The elastic connecting pieces are in a stretching state, and apply outward force to the edge of the auxiliary sounding layer, so that the sounding vibrating diaphragm formed by the display functional layer, the adhesive layer and the auxiliary sounding layer is flattened, and the screen sounding and the projection picture display are facilitated.

In some embodiments, the edge of the auxiliary sounding layer extends beyond the edge range of the display functional layer, and a through hole is arranged in the edge region of the auxiliary sounding layer extending outside the display functional layer; the first end of the elastic connecting piece is connected with the inner wall of the through hole.

The first end of the elastic connecting piece can penetrate through the through hole and be clamped with the through hole or bind the auxiliary sounding layer, so that the elastic connecting piece is convenient to be stably connected with the auxiliary sounding layer.

In some embodiments, the auxiliary sounding layer is further provided with a connecting piece, and the connecting piece is enclosed at the edge of the through hole; the first end of the elastic connecting piece is connected with the connecting piece.

The connecting piece can be the ring that has certain intensity, and the connecting piece parcel corresponds the edge of through-hole to avoid the through-hole edge to tear the damage, and then protect supplementary sound production layer.

In some embodiments, the frame comprises an inner frame having a flange remote from the sound emitting screen and an outer frame; the outer frame wraps the inner frame; the flange is attached to the hanging surface, so that the hanging surface and the auxiliary sounding layer are enclosed to form the sounding cavity; or the flange is attached to the hanging surface, so that the hanging surface and the display functional layer are enclosed to form the sounding cavity; the second end of the elastic connecting piece is connected with the inner frame.

The outer frame is matched with the inner frame, an annular groove with a certain width and depth can be formed between the outer frame and the inner frame, the width of the annular groove is larger than that of the elastic connecting piece, and the length of the annular groove is larger than that of the elastic connecting piece, so that the elastic connecting piece is hidden, and the attractiveness of the sounding screen of the embodiment of the application is improved.

In some embodiments, the inner frame is provided with a connecting ring; the second end of the elastic connecting piece is connected with the connecting ring. Thereby facilitating the second end of the elastic connecting piece to be fixed on the inner frame, and further facilitating the assembly of the sound production screen.

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

The display of the picture is realized by reflecting the light beam emitted by the laser projector through the projection screen, after the piezoelectric ceramic piece receives the electric signal transmitted by the laser projector, the display function layer, the sounding diaphragm formed by the auxiliary sounding layer and the adhesive layer can be stimulated to vibrate and sound based on the electric signal, so that the sounding effect is realized while the picture is displayed, and the perfect combination of the vision and the hearing of the projection equipment is improved.

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 front view of a projection screen provided by an embodiment of the present application;

FIG. 4 is a rear view of a projection screen provided by an embodiment of the present application;

FIG. 5 is a schematic diagram of a partition of a sound-producing diaphragm according to an embodiment of the present application;

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

FIG. 7 is an exploded view of a projection screen including a first adhesive layer according to an embodiment of the present application;

FIG. 8 is an exploded view of a projection screen including a second adhesive layer according to an embodiment of the present application;

FIG. 9 is a schematic view of a frame according to an embodiment of the present application;

FIG. 10 is a schematic structural view of an elastic connector according to an embodiment of the present application;

FIG. 11 is a schematic diagram of an auxiliary sounding layer of a projection screen according to an embodiment of the present application;

FIG. 12 is a schematic diagram illustrating the mounting of a cavity and a piezoelectric ceramic plate according to an embodiment of the present application;

fig. 13 is a schematic diagram illustrating the installation of the through hole and the piezoelectric ceramic chip according to the 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, VC D (Video Compact Disc: video high-density optical disk), DVD (DIGITAL VERSATILE DISC Recordable: digital video disk), 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 optics of 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, a frame, a cover plate, a suspension bracket, a damping 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 damping layer and the electromagnetic exciter are sequentially connected to form a sound-emitting screen, and the frame, the cover plate and the suspension bracket are of supporting structures and are used for fixing the sound-emitting screen. 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 being applied to the projection screen with piezoceramics piece, because piezoceramics piece's simple structure, consequently can realize piezoceramics piece's fixed through selecting suitable sticky material, and need not to cooperate structures such as frame, apron like electromagnetic exciter to realize fixing, consequently possess projection screen dead weight lighter, processing and maintenance process more portably of this kind of sound production structure, do benefit to the reduction of product cost.

Therefore, the embodiment of the application takes the piezoelectric ceramic plate as an excitation source, and combines the sounding structure based on the piezoelectric ceramic plate with the projection screen with different structures, thereby realizing sounding of the projection screen and further meeting the personalized requirements of users to the greatest extent.

According to the projection screen provided by the embodiment of the application, the sounding of the projection screen is realized through the piezoelectric ceramic plates arranged on the sounding 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 projection screens with various structures. In addition, compared with an electromagnetic exciter, the piezoelectric ceramic plate has smaller mechanical vibration generated for the projection screen, so that when the piezoelectric ceramic plate is fixed in a bonding mode, the bonding effect of the piezoelectric ceramic plate is better, the situation that the projection screen is possibly subjected to glue opening due to stress fatigue and the like can be reduced, and the self structural stability of the projection screen is guaranteed.

The projection screen provided in this embodiment includes a frame 100, a sound emitting screen 200, and a plurality of piezoelectric ceramic plates 500. The entire sound-emitting screen 200 is used as the sound-emitting diaphragm of the piezoelectric ceramic plate 500, and after the piezoelectric ceramic plate 500 is electrified and vibrated, the piezoelectric ceramic plate 500 can excite the sound-emitting diaphragm to vibrate to emit sound, and different sound effects are generated by the projection screen through the arrangement of different partitions in the sound-emitting diaphragm.

Fig. 3 is a front view of a projection screen according to an embodiment of the present application, fig. 4 is a rear view of a projection screen according to an embodiment of the present application, fig. 5 is a schematic view of a sound-producing diaphragm according to an embodiment of the present application, and fig. 6 is an exploded view of a projection screen according to an embodiment of the present application.

Specifically, referring to fig. 3 to 6, the projection screen provided by the embodiment of the present application includes a sound emitting screen 200, where the sound emitting screen 200 is used for displaying an image projected by a projector, and the sound emitting screen 200 includes a display function layer 210 and a flexible auxiliary sound emitting layer 220; a frame 100, the frame 100 being connected to a periphery of the sound emitting screen 200; the piezoelectric ceramic piece 500 is attached to the display functional layer, and one surface of the piezoelectric ceramic piece 500 away from the display functional layer 210 is attached to the auxiliary sounding layer 220; the piezoelectric ceramic plate 500 generates deformation under the action of the periodic voltage to excite the auxiliary sounding layer 220 and the display function layer 210 to vibrate in the same direction, i.e. drive the whole sound-emitting screen 200 to vibrate.

In some embodiments, the frame 100 is in a ring structure, the frame 100 may be a planar frame or a curved frame, and the frame 100 has a certain strength, and in some examples, a metal material may be selected but not limited to.

The sound emitting screen 200 has a display functional layer 210 and an auxiliary sound emitting layer 220 which are arranged opposite to each other, the light beam emitted by the projection host is reflected by the display functional layer 210 to realize the display of a picture, the auxiliary sound emitting layer 220 is used for connecting other components, the display functional layer 210 and the auxiliary sound emitting layer 220 are flexible structures, and the peripheral edge of the back surface of the auxiliary sound emitting layer 220 is connected to the frame 100 to flatten the display functional layer 200. That is, the auxiliary sound-emitting layer 220 is also a flexible structure, and the auxiliary sound-emitting layer 220 may be made of polyamide fiber, polyester fiber, or the like.

As shown in fig. 7, in some embodiments, the projection screen further includes a first adhesive layer 410, where the first adhesive layer 410 is adhered to a surface of the display function layer 200 near the auxiliary sound generating layer 220, and the display function layer 210 is adhered to the auxiliary sound generating layer 20 through the first adhesive layer 410. The first adhesive layer 410 may be an adhesive such as a double-sided adhesive, a glue film, or glue. The first adhesive layer 410 completely covers one surface of the display functional layer 210, which is close to the auxiliary sounding layer 220, so that the display functional layer 210 is completely attached to the auxiliary sounding layer 220, and accordingly, the consistency of the density of each position of the sounding diaphragm formed by the display functional layer 210 and the auxiliary sounding layer 220 is ensured, and the consistency of the sounding effect of each position of the sounding diaphragm can be ensured.

As shown in fig. 8, in some embodiments, the projection screen further includes a second adhesive layer 420, the piezoceramic sheet 500 is adhered to the display function layer 210 through the second adhesive layer 420, and/or the piezoceramic sheet 500 is adhered to the auxiliary sound emitting layer 220 through the second adhesive layer 420.

The constituent materials of the first adhesive layer 410 and the second adhesive layer 420 may be the same or different, and are not limited herein. Of course, in order to consider repair of the piezoelectric ceramic sheet 500, the second adhesive layer 420 may be reworkable adhesive tape.

The sound emitting screen structure provided by the application is described below with reference to three specific embodiments.

Embodiment one:

The piezoelectric ceramic piece 500 is connected with one side of the display function layer 210; the second adhesive layer 420 is disposed on one side of the piezoelectric ceramic plate 500 near the display functional layer 210, the piezoelectric ceramic plate 500 can be adhered to the display functional layer 210 through the second adhesive layer 420, after the display functional layer 210 is adhered to the auxiliary sounding layer 220, the piezoelectric ceramic plate 500 is clamped between the display functional layer 210 and the auxiliary sounding layer 220, and one side of the piezoelectric ceramic plate 500, where the second adhesive layer 420 is not disposed, can be adhered to the auxiliary sounding layer 220. When the piezoelectric ceramic sheet 500 is energized to vibrate, the piezoelectric ceramic sheet 500 vibrates in the same direction with the display function layer 210 and the auxiliary sound generating layer 220 attached to the piezoelectric ceramic sheet 500. At this time, the display functional layer 210 and the auxiliary sounding layer 220 are generating diaphragms with composite structures, and have good sounding effects.

Embodiment two:

The piezoelectric ceramic piece 500 is connected with one side of the auxiliary sounding layer 220; the second adhesive layer 420 is disposed on one surface of the piezoelectric ceramic piece 500 near the auxiliary sounding layer 220, and the piezoelectric ceramic piece 500 can be adhered to the auxiliary sounding layer 220 through the second adhesive layer 420. After the auxiliary sounding layer 220 is attached to the display function layer 210, the piezoelectric ceramic sheet 500 is clamped between the auxiliary sounding layer 220 and the display function layer 210, and the surface of the piezoelectric ceramic sheet 500, on which the second adhesive layer 420 is not disposed, may also be attached to the display function layer 210. When the piezoelectric ceramic sheet 500 is energized to vibrate, the piezoelectric ceramic sheet 500 vibrates in the same direction with the auxiliary sounding layer 220 and the display function layer 210 attached to the piezoelectric ceramic sheet 500. At this time, the auxiliary sounding layer 220 and the display functional layer 210 are the generating vibrating diaphragm with a composite structure, and have good sounding effect.

Embodiment III:

The piezoelectric ceramic piece 500 is connected with the display function layer 210 and the auxiliary sounding layer 220 in double-sided manner; the second adhesive layer 420 is disposed on two opposite sides of the piezoelectric ceramic plate 500, and the piezoelectric ceramic plate 500 can be adhered to the display functional layer 210 and the auxiliary sounding layer 220 through the second adhesive layer 420, and clamped between the display functional layer 210 and the auxiliary sounding layer 220. Since the second adhesive layers 420 are disposed on both sides of the piezoelectric ceramic sheet 500, the piezoelectric ceramic sheet 420 is more tightly bonded to the display function layer 210 and the auxiliary sound-generating layer 220. When the piezoelectric ceramic sheet 500 is energized to vibrate, the piezoelectric ceramic sheet 500 vibrates in the same direction with the display function layer 210 and the auxiliary sound layer 220 closely attached to the piezoelectric ceramic sheet 500. At this time, the display functional layer 210 and the auxiliary sounding layer 220 are generating diaphragms with composite structures, and generate fewer noise, so that the display functional layer has good sounding effect.

According to the embodiment of the application, the flexible display functional layer 200 and the flexible auxiliary sounding layer 220 can be bonded together through the first adhesive layer 410 to serve as a sounding diaphragm, and the piezoelectric ceramic piece 500 can be tightly bonded with the display functional layer 210 and/or the auxiliary sounding layer 220 through the second adhesive layer 420. The degree of tightness of the fit is related to the resultant noise, with the tighter fit being the less noise. The sounding diaphragm has certain flexibility, and the piezoelectric ceramic sheet 500 excites the sounding diaphragm to vibrate to make sound, so that the sounding of the projection screen is realized, and the problem that the conventional electromagnetic excitation scheme cannot be applied to the flexible projection screen is solved.

The embodiment of the application utilizes the characteristics of thin appearance, light weight, low power consumption and excellent medium-high frequency tone of the piezoelectric ceramic plate 500, and the flexible projection screen formed by the frame 100, the sounding diaphragm and the piezoelectric ceramic plate 500 has the advantages of simple structure, light weight and difficult machine vibration, and solves the problems of thicker, complex excitation structure and easy machine vibration of the traditional sounding screen.

The sound-emitting diaphragm of the embodiment of the application can be composed of the display function layer 200, the auxiliary sound-emitting layer 220 and the first adhesive layer 410, and sound-emitting diaphragms with different sound-emitting effects can be formed by changing the material selection of the display function layer 200, the auxiliary sound-emitting layer 220 and the first adhesive layer 410, so that different frequency band broadening effects are realized.

To make the piezoelectric ceramic sheet 500 more tightly fit with the display function layer 210 and the auxiliary sound generation layer 220, in some embodiments, the auxiliary sound generation layer 220 includes mounting holes, which are concave holes or through holes, and the openings of the mounting holes face the display function layer 210. The piezoelectric ceramic piece 500 is located in the mounting hole, and the size of the piezoelectric ceramic piece 500 is consistent with that of the mounting hole. That is, the piezoelectric ceramic pieces 500 are disposed in the corresponding mounting holes, and the size of the piezoelectric ceramic pieces 500 is consistent with the size of the corresponding recess holes.

For example, referring to fig. 12, fig. 12 is a schematic view illustrating the installation of the concave hole 700 and the piezoelectric ceramic plate 500 according to the embodiment of the present application. As shown in fig. 12, the auxiliary sounding layer 220 is provided with a concave hole 700, the piezoelectric ceramic plate 500 is located in the concave hole 700, and the size of the concave hole 700 is consistent with that of the piezoelectric ceramic plate 500. That is, the cavity formed by enclosing the concave hole 700 can just place one piezoelectric ceramic plate 500, so that the piezoelectric ceramic plate 500 can be closely attached to the auxiliary sounding layer 220 and also closely attached to the display functional layer 210 at the same time, thereby improving the sound effect.

Referring to fig. 13, fig. 13 is a schematic view illustrating the installation of the through hole 800 and the piezoelectric ceramic chip 500 according to the embodiment of the application. As shown in fig. 13, the auxiliary sound generating layer 220 is provided with a through hole 800, and the piezoelectric ceramic piece 500 is located in the through hole 800, and the size of the through hole 800 is consistent with that of the piezoelectric ceramic piece 500. That is, the through hole 800 may just place one piezoelectric ceramic piece 500, so that the piezoelectric ceramic piece 500 may be closely attached to the auxiliary sounding layer 220 in the through hole 800, and directly attached to the display functional layer 210 through the auxiliary sounding layer 220 by passing through the through hole 800, thereby improving the sound effect.

The dimple structure provided by the present application will be described below with reference to three specific embodiments.

Embodiment four:

One piezoelectric ceramic piece 500 corresponds to one concave hole 700, the concave hole 700 is arranged in the auxiliary sounding layer 220, the piezoelectric ceramic piece 500 is of a cuboid structure, and the length, width and height of the outer surface of the piezoelectric ceramic piece 500 are x, y and z respectively; the cavity that shrinkage pool 700 constitutes is cuboid structure too, and its length width height is x, y, z too, and then can make piezoceramics piece 500 bond behind shrinkage pool 700, and one side fully laminates with the adhesive linkage, and other three sides fully laminates with supplementary sound production layer 220.

Fifth embodiment:

One piezoelectric ceramic piece corresponds to two concave holes 700, the two concave holes 700 are respectively arranged in the auxiliary sounding layer 2 and the bonding layer, the piezoelectric ceramic piece 500 is of a cuboid structure, and the length, width and height of the outer surface of the piezoelectric ceramic piece are respectively x, y and z; the inner cavities formed by the two concave holes 700 are also in a cuboid structure, and the length, width and height of the inner cavities of the two concave holes 700 are x, y/2 and z. Then, the cavity formed by the two concave holes 700 can just accommodate one corresponding piezoelectric ceramic piece 500, so that the piezoelectric ceramic piece 500 is fully attached to the two concave holes 700 after being adhered to the two concave holes 700.

It can be appreciated that the concave holes described in the fourth and fifth embodiments are also applicable to the through hole, and the piezoelectric ceramic sheet can directly attach to the display functional layer through the through hole, so that a better attaching effect is achieved.

In addition, the arrangement mode of the piezoelectric ceramic plates 500 on the sounding diaphragm can be reasonably set, so that different sound effects can be generated by the sounding screen. In particular, reference may be made to the following several different embodiments:

Example six:

Referring to fig. 4, a plurality of piezoelectric ceramic (e.g., 4) sheets may be equally divided into two groups, and the sounding diaphragm may be divided into left and right regions; one group of the piezoelectric ceramic plates (containing 2 piezoelectric ceramic plates) is arranged in the left side area of the sounding diaphragm, the other group of the piezoelectric ceramic plates (containing 2 piezoelectric ceramic plates) is arranged in the right side area of the sounding diaphragm, and the sounding diaphragm is driven to vibrate through the vibration of the piezoelectric ceramic plates in the left area and the right area, so that the sound emitted by the sounding screen has a left-right double-channel effect.

Embodiment seven:

Because the sound effect of the two channels is thinner, in order to make the projection screen have better sound effect, the partition can be designed for each frequency band separately (when signals are input, the signal frequency band of each partition is distinguished, for example, only high-frequency signals are input in a high-frequency area, only low-frequency signals are input in a low-frequency area, namely, the sound-producing vibrating diaphragm is divided into a plurality of partitions), so that sound production of the whole frequency band of the projection screen is realized, and the sound effect is better. The more partitions, the more distinct the full band signals are differentiated, the better the sound effect. Furthermore, for each frequency band (e.g., high frequency, intermediate frequency, low frequency, etc.), the corresponding partition of each frequency band may be further subdivided. For example, the low frequency 200-400Hz corresponding partition can be divided into two small partitions of 200-300Hz and 300-400Hz respectively. It should be noted that, in the embodiment of the present application, the specific frequency range of each frequency band is not limited, for example, the frequency range of the low frequency is not limited to 200-400Hz, and a technician can reasonably set according to the natural frequencies of different materials.

Illustratively, the sound emitting diaphragm may be divided into 3 partitions, 5 partitions, 7 partitions, 9 partitions, etc.; wherein, when dividing into 3 subregions with sound production vibrating diaphragm, can set up the top of sound production vibrating diaphragm into high frequency region, the middle part sets up to the low frequency region, the bottom sets up to the intermediate frequency region, a plurality of piezoceramics piece (like 9) even setting respectively in every subregion for sound production screen can send the sound of high frequency, intermediate frequency and low frequency respectively, thereby promotes projection screen's sound production effect. Referring to fig. 5, when the sounding diaphragm is divided into 5 partitions, the upper half of the sounding diaphragm includes 3 partitions having the same area, and the lower half includes 2 partitions having the same area; the upper half of the 3 partitions are sequentially provided with a high-frequency region, a medium-frequency region and a high-frequency region from left to right, and the lower half of the 3 partitions are provided with a low-frequency region, so that the sounding screen can generate better surrounding sound effect in a partition mode. When the sounding diaphragm is divided into 7 partitions and 9 partitions, the sounding screen generates stereo sound effect, sky sound effect and the like respectively.

It should be understood that the number of partitions and the division manner in the sounding diaphragm are not limited in the embodiment of the present application, and those skilled in the art may use a different manner from the above two embodiments to perform the setting.

Referring to fig. 9, in some examples, the frame 100 may include an inner frame 110 and an outer frame 120, the outer frame 120 being wrapped around the outer circumference of the inner frame 110. The outer frame 120 and the inner frame 110 may be square frames, and the cross sections of the outer frame 120 and the inner frame 110 may be two opposite L-shapes, so that the outer frame 120 and the inner frame 110 may surround to form an annular groove with a certain width and depth.

In the embodiment of the application, the projection screen in the laser projection display device is set to be in the structure under any one of the examples, the display function layer 200 reflects the light beam emitted by the laser projector to display the picture, and the piezoelectric ceramic sheet 500 excites the sound-producing vibrating diaphragm formed by the gluing layer 400, the display function layer 200 and the auxiliary sound-producing layer 220 to vibrate to produce sound, so that the perfect combination of the vision and the hearing of the projection device is improved.

In some embodiments, referring to fig. 10, the frame 100 may include an inner frame 110 and an outer frame 120, the inner frame 110 having a flange 111 remote from the sound emitting screen, and a vertical beam 130, the outer frame 120 being used to wrap the inner frame 110. Wherein, be connected between flange 111 and the outside wall body, vertical beam 130 can be a plurality of, and a plurality of vertical beams 130 set up on inside casing 110, and a plurality of vertical beams 130 all are located the back that shows functional layer 200, and a plurality of vertical beams 130 can the equidistance vertical setting to support inside casing 110, prevent inside casing 110 deformation, and then improve the intensity and the stability of frame 100.

In some embodiments, the inner frame 110 has a flange remote from the sound emitting screen 200; wherein, the flange is jointed with the hanging surface, so that the hanging surface and the auxiliary sounding layer 200 are enclosed to form a sounding cavity; or the flange is attached to the hanging surface, so that the hanging surface and the display functional layer 210 enclose to form an acoustic cavity. The hanging surface can be a plane such as a wall.

For example: the frame 100 may include an inner frame 110 and an outer frame 120, the outer frame 120 being wrapped around the outer circumference of the inner frame 110. The outer frame 120 and the inner frame 110 may be square frames, and the cross sections of the outer frame 120 and the inner frame 110 may be two opposite L-shapes, so that the outer frame 120-2 and the inner frame 110-2 may surround to form an annular groove with a certain width and depth.

In some embodiments, the spacing between any two adjacent piezoelectric ceramic plates is equal, and the piezoelectric ceramic plates are arranged in a matrix. 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 even sound production effect of sound production screen has further been promoted to the mode that the matrix was arranged.

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.

When the auxiliary sounding layer is included in the projection screen provided by the embodiment of the present application, the auxiliary sounding layer is made of a flexible material, so as to ensure the flatness of the auxiliary sounding layer, in some embodiments, the projection screen includes a plurality of elastic connectors 600; the elastic connection member 600 includes a first end and a second end, the first end of the elastic connection member 600 is connected with the edge of the auxiliary sound generation layer 220, the second end of the elastic connection member 600 is connected with the frame 100, and the plurality of elastic connection members 600 are used for flattening and fixing the sound generation screen 200.

For example: referring to fig. 11, the elastic connection 600 may include, but is not limited to, an elastic band or a spring. Each elastic connection 600 has opposite first and second ends (see a in fig. 10) and b in fig. 10), the first end of each elastic connection 600 being connected to the edge of the auxiliary sound layer 220, and the second end of each elastic connection 600 being connected to the inner frame 110.

Wherein, a plurality of elastic connection pieces 600 all are in tensile state, apply outside power to the edge of supplementary sound production layer 220 to make the sound production vibrating diaphragm that contains supplementary sound production layer 220 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. 10 and 11, in some embodiments, when the auxiliary sound emitting layer 220 is disposed, the edge of the auxiliary sound emitting layer 220 extends beyond the edge of the display function layer, and a plurality of connection holes 310 are disposed in the edge region of the auxiliary sound emitting layer 220 extending outside the display function layer. Each of the connection holes 310 may be a circular hole, the plurality of connection holes 310 surround the auxiliary sound layer 220, the plurality of connection holes 310 are in one-to-one correspondence with the plurality of elastic connection pieces 600, and the first end of each of the elastic connection pieces 600 is connected with the peripheral wall of the corresponding connection hole 310.

In some examples, the first end of the elastic connection member 600 may be penetrated into the connection hole 310 and connected with the inner wall of the connection hole 310, thereby being stably connected with the auxiliary sound layer 220.

In other examples, the auxiliary sounding layer 220 is further provided with a plurality of connecting pieces 320, the connecting pieces 320 may be circular rings or eyelet buttons (eyelet buttons are also called 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 320 are in one-to-one correspondence with the plurality of connecting holes 310, the outer ring of each connecting piece 320 is connected with the edge of the corresponding connecting hole 310, or a part of the connecting piece 320 is enclosed at the edge of the connecting hole 310, the first end of each elastic connecting piece 600 is connected with the corresponding connecting piece 320, for example, referring to fig. 10, the first end (a end) of each elastic connecting piece 600 is an annular buckle or an integral connecting ring 610, and the annular buckle is buckled with the connecting piece 320, so that the connection between the elastic connecting piece 600 and the auxiliary sounding layer 220 is realized, thereby the tensile force of the elastic connecting piece 600 is prevented from directly acting on the connecting hole 310, the edge of the connecting hole 310 is prevented from tearing and damaging, the auxiliary sounding layer 220 is further protected, the sounding effect of the vibrating diaphragm is ensured, and the service life of the auxiliary sounding layer 220 is prolonged.

Of course, in other examples, the first end of the elastic connection member 600 may be fixed on the surface of the edge area of the auxiliary sound generating layer 220 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 600 may be connected to the inner frame 110, the outer frame 120 and the inner frame 110 may be square frames 100, and the cross sections of the outer frame 120 and the inner frame 110 may be two opposite L-shapes, so that the outer frame 120 and the inner frame 110 may surround to form an annular groove with a certain width and depth, the width of the annular groove should be greater than the width of the elastic connection member 600, and the length of the annular groove should be greater than the length of the elastic connection member 600, thereby hiding the elastic connection member 600 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. 10, a plurality of connection rings 610 may be provided on the inner frame 110, where the plurality of connection rings 610 correspond to the plurality of elastic connection members 600 one by one, and the second end of each elastic connection member 600 is connected to the corresponding connection ring 610, so that the second end of the elastic connection member 600 is conveniently fixed on the inner frame 110, and further, the assembly of the projection screen according to the embodiment of the present application is convenient.

The connection ring 610 should have a certain rigidity, not be easy to deform, 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 600 may be fixed to the surface of the inner frame 110 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 some embodiments, for frames with flanges, the frame may further include a shock absorbing layer (not shown) provided at the connection of the flange 111 with the external wall for buffering 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.

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 projection 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 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.

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 (10)

1. A projection screen, comprising:

The sound generating screen is used for displaying images projected by the projector and comprises a display function layer and a flexible auxiliary sound generating layer;

the frame is connected with the periphery of the sound production screen;

The piezoelectric ceramic piece is attached to the display functional layer, and one surface of the piezoelectric ceramic piece, which is far away from the display functional layer, is attached to the auxiliary sounding layer; the piezoelectric ceramic piece generates deformation under the action of periodic voltage to excite the auxiliary sounding layer and the display functional layer to vibrate in the same direction.

2. The projection screen of claim 1, further comprising a first adhesive layer covering a side of the display functional layer adjacent to the auxiliary sound layer, the display functional layer being adhered to the auxiliary sound layer by the first adhesive layer.

3. The projection screen of claim 1, further comprising a second adhesive layer, wherein the piezoelectric ceramic sheet is adhered to the display function layer through the second adhesive layer, and/or wherein the piezoelectric ceramic sheet is adhered to the auxiliary sound generation layer through the second adhesive layer.

4. The projection screen of claim 1, wherein the auxiliary sound-emitting layer includes a mounting hole, the mounting hole being a recess hole or a through hole, the mounting hole opening toward the display function layer; the piezoelectric ceramic piece is positioned in the mounting hole, and the size of the piezoelectric ceramic piece is consistent with that of the mounting hole.

5. The projection screen of claim 1 further comprising a plurality of resilient connectors; the elastic connecting piece comprises a first end and a second end, the first end of the elastic connecting piece is connected with the edge of the auxiliary sounding layer, the second end of the elastic connecting piece is connected with the frame, and the elastic connecting pieces are used for flattening and fixing the sounding screen.

6. The projection screen of claim 5 wherein the edge of the auxiliary sound layer extends beyond the edge of the display function layer and the edge of the auxiliary sound layer extending beyond the display function layer is provided with a through hole; the first end of the elastic connecting piece is connected with the inner wall of the through hole.

7. The projection screen of claim 6, wherein the auxiliary sound layer is further provided with a connecting piece, and the connecting piece is enclosed on the edge of the through hole; the first ends of the elastic connecting pieces are connected with the connecting pieces.

8. The projection screen of claim 5 wherein the frame comprises an inner frame and an outer frame, the inner frame having a flange remote from the sound emitting screen; the outer frame wraps the inner frame; the flange is attached to the hanging surface, so that the hanging surface and the auxiliary sounding layer are enclosed to form a sounding cavity;

Or the flange is attached to the hanging surface, so that the hanging surface and the display functional layer are enclosed to form the sounding cavity;

The second end of the elastic connecting piece is connected with the inner frame.

9. The projection screen of claim 8 wherein the inner frame is provided with a connecting ring; the second end of the elastic connecting piece is connected with the connecting ring.

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.