CN112099299B

CN112099299B - Self-sounding projection display device

Info

Publication number: CN112099299B
Application number: CN201910524075.2A
Authority: CN
Inventors: 郭富新; 王海盈
Original assignee: Hisense Visual Technology Co Ltd
Current assignee: Hisense Visual Technology Co Ltd
Priority date: 2019-06-17
Filing date: 2019-06-17
Publication date: 2022-07-08
Anticipated expiration: 2039-06-17
Also published as: WO2020253143A1; CN112099299A; CN215769329U

Abstract

The invention provides a spontaneous acoustic projection display device, wherein the display device comprises a frame, a screen and a plurality of transducers, wherein the screen comprises a sounding substrate and an optical diaphragm which covers one side surface of the sounding substrate and is used for receiving and displaying images; the sounding substrate comprises a honeycomb core plate and a skin, wherein the honeycomb core plate comprises a plurality of honeycomb grids which are staggered along a first direction and a second direction; the covering covers openings at two ends of the honeycomb grids; the plurality of transducers are arranged on the other side surface of the sounding substrate, and the frame is used for bearing the screen and the plurality of transducers. The invention can obviously distinguish the left and right sound channels of the audio so as to improve the audio-visual experience of the user.

Description

Self-sounding projection display device

Technical Field

The invention relates to the technical field of projection screens, in particular to a spontaneous sound projection display device.

Background

With the development of projection technology, multimedia audiovisual systems that display by projection are more and more accepted. As shown in fig. 1, most of the multimedia audiovisual systems that perform display by projection are composed of a projector E1, a projection screen E2, a sound reinforcement speaker E3, and a control system E4. However, because the positions of the projection screen E2 and the loudspeaker box E3 are different, audio-visual feeling with asynchronous sound images is inevitably generated during projection playing, so that people cannot obtain a good audio-visual playing experience.

Therefore, in order to avoid the synchronization of sound images, it is a mainstream development direction to utilize the self-vibration sound production of the projection screen to replace the traditional sound amplification sound box. The existing realization scheme is that a sound production substrate is matched with a transducer, the transducer is attached to one side surface of the sound production substrate, and the other side surface of the sound production substrate is used as a display surface. The transducer converts the received audio signal into mechanical vibration and drives the sound production substrate to vibrate so as to produce sound waves for sound production. However, as shown in fig. 2 and 3, the transducer is disposed on a side surface of the sound substrate, the transducer can convert an audio signal into corresponding mechanical vibration to drive the sound substrate to perform resonance sound generation, in fig. 2, the darker the color represents that the amplitude intensity of the position is larger, so as shown in fig. 2, the transducer excites bending waves with substantially equal amplitude at each position on the surface of the sound substrate, which results in that the same size of sound is generated at each position on the surface of the sound substrate, and thus people cannot distinguish between left and right channels through the vibration position of the sound substrate when receiving the sound generated by the sound substrate, resulting in poor audio-visual effect.

Another available solution (as shown in fig. 3) is to provide a vibration absorbing area E5 in the middle of the sound substrate for isolation, but this solution is equivalent to correspondingly reducing the vibration area of the sound substrate, so that the lower limit of the vibration frequency of the sound substrate is raised, and the low-frequency response of the sound substrate is affected.

In summary, a new solution is needed to solve the problem that the sounding substrate cannot distinguish between the left and right channels and ensure the low frequency response of the sounding substrate.

Disclosure of Invention

The utility model aims to provide a spontaneous acoustic projection display device aims at solving the technical problem that the vocal substrate can not distinguish left and right sound channels and has poor low-frequency response in the prior art.

Accordingly, the present disclosure provides a spontaneous acoustic projection display device comprising:

the screen comprises a sounding substrate and an optical diaphragm covering one side surface of the sounding substrate and used for receiving and displaying images; the sounding substrate comprises a honeycomb core plate and skins, the honeycomb core plate comprises a plurality of honeycomb grids which are staggered along a first direction and a second direction, and the skins cover openings at two ends of the honeycomb grids;

the transducers are arranged on the other side surface of the sounding substrate and are used for converting audio signals into mechanical vibration so that the sounding substrate vibrates to send out sound waves;

a frame to carry the screen and the plurality of transducers.

Optionally, the first direction and the second direction are perpendicular, and the length of the honeycomb lattice in the first direction is smaller than that in the second direction, so that the energy loss of the mechanical vibration when the mechanical vibration is transmitted in the first direction is larger than that when the mechanical vibration is transmitted in the second direction.

Optionally, two adjacent cells in the second direction form a cell, and a ratio of a length of the cell in the first direction to a maximum length of the cell in the same straight line in the second direction is between 0.4 and 0.7.

Optionally, the skin is made of interwoven fiber cloth, and the number of fibers of the skin extending along the second direction is greater than or equal to the number of fibers extending along the first direction.

Optionally, the skin is made of unidirectional fiber cloth, and the fiber extending direction of the skin is parallel to the second direction.

Optionally, the plurality of transducers are symmetrically disposed on two sides of a central axis of the sound substrate, and the central axis is parallel to the second direction.

Optionally, a separation strip extending along the second direction is disposed in a middle area of the honeycomb core plate, and a ratio of lengths of the cells on the separation strip in the first direction to the second direction is smaller than a ratio of lengths of the cells other than the separation strip in the first direction to the second direction.

Optionally, the honeycomb cell includes two sidewalls parallel to the second direction.

Optionally, the honeycomb lattice on the isolation belt is filled with a sound absorbing material.

Optionally, the display device further comprises a supporting plate, two ends of the supporting plate card are respectively clamped with the frame, and the supporting plate and the at least one transducer are far away from the surface of the sounding substrate in an abutting mode.

Optionally, the display device further includes a buffer unit, which is disposed on one side of the sound substrate having the transducer, the buffer unit includes a rear cover and a spacer bar, the spacer bar surrounds the transducer, and the rear cover covers the spacer bar.

Optionally, the display device further includes a stabilizing unit disposed on a side of the sound substrate having the transducer, where the stabilizing unit includes a base, a plurality of support legs, and a damping block for connecting the support legs and the sound substrate; the supporting feet are arranged along the circumferential direction of the base at intervals and extend outwards, and the base is provided with a containing groove used for containing the transducer.

The technical scheme provided by the embodiment of the disclosure can have the following beneficial effects:

through each embodiment of the disclosure, the sounding substrate comprises a honeycomb core plate and a skin, and the honeycomb core plate comprises a plurality of honeycomb grids which are staggered along a first direction and a second direction, so that the rigidity of the honeycomb core plate in the first direction is small, the compliance to mechanical vibration is high, and the rigidity in the second direction is large, and the compliance to mechanical vibration is low. Therefore, when the honeycomb core plate transmits mechanical vibration, the energy loss of the mechanical vibration in the second direction of the honeycomb core plate is lower than that of the mechanical vibration in the first direction, and the main distribution range of the mechanical vibration energy can be restricted on the excited side of the honeycomb core plate. Therefore, when the transducer is placed along the first direction of the sounding substrate, a user can obviously identify the excitation point position of the transducer on the sounding substrate so as to distinguish the left and right sound channels of sound, and the audio-visual experience of the user is improved. And the vibration area of the sounding substrate is not reduced, so that the lower frequency lower limit of the vibration of the sounding substrate is ensured, namely the low-frequency response of the sounding substrate is ensured.

It is to be understood that both the foregoing general description and the following detailed description are exemplary and explanatory only and are not restrictive of the disclosure.

Drawings

FIG. 1 is a schematic diagram of a prior art multimedia audiovisual system;

FIG. 2 is a diagram illustrating the amplitude of vibration at various locations of a sound emitting substrate in the prior art when transmitting mechanical vibrations;

fig. 3 is a schematic structural view of a sound-emitting substrate provided with a vibration-absorbing region in the prior art;

FIG. 4 is a schematic structural diagram of an alternative embodiment of the spontaneous acoustic projection display apparatus according to the embodiment of the present invention;

FIG. 5 is an assembly schematic diagram of an alternative embodiment of an autonomous acoustic projection display apparatus according to an embodiment of the present invention;

FIG. 6 is a schematic cross-sectional view of FIG. 4 along direction A-A;

FIG. 7 is an enlarged partial schematic view at A of FIG. 6;

FIG. 8a is a schematic structural diagram of a honeycomb core board of an alternative embodiment of the spontaneous acoustic projection display device according to the embodiment of the present invention;

FIG. 8b is a schematic structural diagram of a honeycomb core board of another alternative embodiment of the spontaneous acoustic projection display device according to the embodiment of the present invention;

FIG. 9 is a schematic structural diagram of a skin of an alternative embodiment of a spontaneous acoustic projection display apparatus according to an embodiment of the present invention;

FIG. 10 is a schematic cross-sectional view taken along B-B of FIG. 2;

FIG. 11 is an assembly view of a stabilizing unit and a transducer of an alternative embodiment of the self-emissive projection display device according to an embodiment of the present invention;

FIG. 12 is a schematic diagram of another structure of a stabilizing unit of an alternative embodiment of the spontaneous acoustic projection display apparatus according to the embodiment of the present invention;

fig. 13-14 are schematic views of the arrangement positions of the transducers of alternative embodiments of the spontaneous acoustic projection display device according to the embodiment of the present invention.

Description of the drawings: the screen 10, the transducer 20, the frame 30, the support plate 40, the buffer unit 50, the stabilizing unit 60, the optical diaphragm 11, the sound substrate 12, the honeycomb core plate 121, the honeycomb cells 121-A, the side walls 121-A-1, the isolation strips 121-B, the first direction X, the second direction Y, the skin 122, the rear cover 51, the isolation bars 52, the base 61, the accommodating grooves 611, the legs 62 and the damping blocks 63.

Detailed Description

In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.

The invention scheme is described in detail below with reference to the accompanying drawings:

referring to fig. 4 and 5, in an alternative embodiment of the present invention, the spontaneous acoustic projection display apparatus includes a frame 30, a screen 10, and a plurality of transducers 20. The screen 10 is disposed on the frame 30, the frame 30 is used for carrying the screen 10 and the plurality of transducers 20, and the screen 10 can receive the image projected by the projector and display the received image. The plurality of transducers 20 are disposed on the back of the screen 10, and the transducers 20 can receive the audio signals corresponding to the images and convert the received audio signals into mechanical vibrations to drive the screen 10 to vibrate and generate sound. In the embodiment of the present invention, the transducer 20 may include, but is not limited to, an electromagnetic type, a piezoelectric type, a magnetostrictive type, and the like, which have a function of converting an audio signal into mechanical vibration.

Because the screen 10 can be vibrated to produce sound, the image and the audio can be produced at the same time and the same position, the audio-visual feeling that the audio image is not synchronous due to the fact that the positions of the sound reinforcement sound box and the screen 10 are different when a user watches the image is avoided, and the audio-visual experience of people is improved. In an exemplary embodiment of the present invention, the spontaneous acoustic projection display apparatus may be applied to a laser television, and in another exemplary embodiment of the present invention, the spontaneous acoustic projection display apparatus may also be applied to a conventional projection equipment system, which is not particularly limited in the present invention.

Specifically, fig. 6 is a sectional view taken along a-a direction of fig. 4, fig. 7 is a partially enlarged view of a portion a of fig. 6, and fig. 8a is a structural view of a honeycomb core plate 121 of a sound substrate 12 of a self-sounding projection display device according to the present invention. Referring to fig. 6, 7 and 8a, the screen 10 includes an optical film 11 and a sound substrate 12, the optical film 11 is attached to one side surface of the sound substrate 12, the other side of the optical film 11 away from the sound substrate 12 is a viewing side, and the optical film 11 can receive and display an image projected by the projection apparatus, so that a user can view the image on the viewing side.

In an alternative embodiment of the present invention, the optical film 11 may be an image display film or a touch control functional film according to actual production requirements, and those skilled in the art can select the optical film 11 according to actual needs of the market or users. The image display film includes, but is not limited to, an image display film having optical microstructures such as fresnel, bar grating, or microlens array.

Specifically, referring to fig. 7, 8a and 9, in an alternative embodiment of the present invention, the sound-emitting substrate 12 includes a honeycomb core plate 121 and a skin 122, the honeycomb core plate 121 is a plate-shaped structure and is a honeycomb core sandwiched between two layers of the skin 122, and the honeycomb core plate 121 includes a plurality of honeycomb cells 121-a arranged in a staggered manner along a first direction X and a second direction Y, wherein the first direction X and the second direction Y are perpendicular to each other. Each honeycomb lattice 121-A is a hollow polygonal tubular structure with two open ends, and the honeycomb lattices 121-A can be rectangular, hexagonal square, rhombic and other tubular structures. In order to facilitate the fitting and arrangement of the honeycomb cells 121-a, the honeycomb cells 121-a are optionally a hexagonal cylindrical structure. The skin 122 is a sheet structure, and is used for closing each honeycomb cell 121-a, and covers openings at two ends of each honeycomb cell 121-a, so that each honeycomb cell 121-a is in a closed state, and the honeycomb core plate 121 and the skin 122 cooperate to enable the sound production substrate 12 to produce sound through vibration. The honeycomb core plate 121 may include, but is not limited to, a paper material, an aramid material, a metal material, or other composite material acoustic sound-emitting material.

In an embodiment of the present invention, the length of each cell 121-A in the first direction X is smaller than the length of the cell 121-A in the second direction Y, i.e., the length of the side of the cell 121-A in the second direction Y is larger than the length of the side of the cell 121-A in the first direction X. In the cells 121-a accommodated in the unit area, there are more cell 121-a sidewalls parallel to the second direction Y in the second direction Y, and there are no cell sidewalls parallel to the first direction X in the first direction X, resulting in a small rigidity of the honeycomb core panel 121 in the first direction X, which is easily deformed by an external force, and a large rigidity in the second direction Y, which is not easily deformed by an external force. When the sound substrate 12 transmits the mechanical vibration, the mechanical vibration transmitted along the first direction X is easily absorbed by the deformation of the honeycomb core 121, and the mechanical vibration transmitted along the second direction Y is better transmitted because the honeycomb core 121 is not easily deformed, so that the conductivity of the sound substrate 12 to the mechanical vibration in the second direction Y is greater than that to the mechanical vibration in the first direction X. And since the plurality of cells 121-a are arranged alternately along the first direction X and the second direction Y, the transmission loss of the mechanical vibration in the first direction X between the cells 121-a and the cells 121-a is further increased.

Therefore, with the above arrangement, the sound emission substrate 12 is made to have better conductivity for mechanical vibration in the second direction Y than the sound emission substrate 12 in the first direction X. When the transducer 20 generates mechanical vibration to drive the sound substrate 12 to vibrate, the transmission loss of the mechanical vibration in the first direction X of the sound substrate 12 is large, and the transmission loss in the second direction Y of the sound substrate 12 is small, so that the vibration energy is quickly attenuated when the mechanical vibration is transmitted along the first direction X of the sound substrate 12.

Thus, the sound substrate 12 ensures transmission of the mechanical vibration in the second direction Y of the sound substrate 12, and limits transmission of the mechanical vibration to a certain range of the sound substrate 12. When the received audio signal of the transducer 20 is a left/right channel signal, the transducer 20 is disposed on the corresponding side of the sound-emitting substrate 12, for example, when the received audio signal of the transducer 20 is a left channel audio signal, the transducer 20 is disposed on the left side of the sound-emitting substrate 12. The user can confirm that the audio signal is the audio signal of the left channel or the audio signal of the right channel according to the sound production position of the sound production substrate 12 when watching, and the watching experience of the user is improved.

With continued reference to FIG. 8a, in an alternative embodiment of the present invention, the cell 121-A includes two sidewalls 121-A-1 that are parallel to the second direction Y. It should be understood that the present invention refers to parallelism which is based on the existing industrial conditions, which allows for a certain angular error, such as ± 10 °, ± 15 °, etc., all falling within the scope of the present invention. Since the two side walls 121-a-1 of the cell 121-a are parallel to the second direction Y, the conductivity of each cell 121-a to the mechanical vibration force in the second direction Y is ensured, so that the loss of the vibration energy of the mechanical vibration is reduced when the mechanical vibration is transmitted on the cell 121-a in the second direction Y. Optionally, the two sidewalls 121-a-1 parallel to the second direction Y are oppositely disposed, so as to ensure the conduction of the mechanical vibration force in the second direction Y, and to ensure the structural stability of the honeycomb cells 121-a. Wherein, the distance between the two parallel side walls 121-A-1 of the honeycomb lattice 121-A is between 3mm and 10mm to ensure the structural strength of the honeycomb core plate 121, and optionally, the distance between the two parallel side walls 121-A-1 of the honeycomb lattice 121-A is 4 mm.

Referring to fig. 8B, in an alternative embodiment of the present invention, a middle region of the honeycomb core 121 is provided with a separation strip 121-B extending along the second direction Y, and a length ratio of the cells 121-a on the separation strip 121-B in the first direction X and the second direction Y is smaller than a length ratio of the cells 121-a outside the separation strip 121-B in the first direction X and the second direction Y. Therefore, the cells 121-A on the isolation strip 121-B are denser in the first direction X than the cells 121-A outside the isolation strip 121-B, resulting in the stiffness of the isolation strip 121-B in the first direction X being smaller than the stiffness of the isolation strip 121-B outside the first direction X, which are different from the stiffness of the isolation strip 121-B in the first direction X, so that when mechanical vibration is transmitted on the sound-emitting substrate 12 in the first direction X, the loss rate of the vibration energy of the mechanical vibration on the isolation strip 121-B is greater than the loss rate of the vibration energy on the isolation strip 121-B, resulting in the vibration energy transmitted to the isolation strip 121-B being reduced more, and further reducing the mutual transmission of the vibration on both sides of the isolation strip 121-B, thereby distinguishing the vibration sides of the sound-emitting substrate 12, so that a user can distinguish left and right more clearly, The sound emitted by the right channel improves the audio-visual feeling of the user.

In an alternative embodiment of the present invention, an isolation strip 121-B may be disposed between any two transducers 20 on the sound substrate 12 to block the transmission of vibration between the two transducers 20, so that a user can clearly distinguish the excitation point position of sound when viewing the sound, and thus distinguish the sound emitting position to distinguish the sound channels. It should be understood that the length of the isolation strip 121-B may extend from one side of the sound substrate 12 to the other side, or may be set between two transducers 20 only, so as to reduce the vibration transmission between two transducers 20, and those skilled in the art can set the length according to actual market needs or design needs.

With continued reference to fig. 8a and 8b, two cells 121-a adjacent to each other in the second direction Y form a cell, and the ratio of the length of the cell 121-a in the first direction X to the maximum length of the cell in the same straight line in the second direction Y is between 0.4 and 0.7. The length of the honeycomb cells 121-A in the first direction X is defined as d, and the maximum length of the same straight line of the honeycomb cells in the second direction Y is defined as L, i.e., d/L is more than or equal to 0.4 and less than or equal to 0.7. As shown in fig. 8, the maximum length L of the cell unit in the second direction Y is a length of a straight line passing through a diagonal corner of one cell 121-a of the cell unit. In an alternative embodiment of the present invention, when the cell 121-A has two sidewalls 121-A-1 parallel to the second direction Y, the maximum length L of the cell in the same line in the second direction Y is the length of the opposite vertex angle of one of the two cells 121-A plus the length of the other sidewall 121-A-1 of the two cells 121-A parallel to the second direction Y.

When the ratio of the length d of the honeycomb cells 121-a in the first direction X to the maximum length L of the same straight line of each honeycomb unit in the second direction Y is between 0.4 and 0.7, the sound-emitting substrate 12 of the structure is ensured to have smaller rigidity in the first direction X to ensure that the energy loss of mechanical vibration in the first direction X is larger than that in the second direction Y, and simultaneously, the situation that the rigidity in the first direction X is too small to reduce the overall strength of the sound-emitting substrate 12 is avoided. That is, while the mechanical vibration is ensured to have as many diffusion distances as possible in the second direction Y of the sound emission substrate 12 of this structure to increase the vibration sound emission range, the diffusion distance of the mechanical vibration in the first direction X is also reduced to reduce the mutual interference of the left and right vibration sound emission areas.

Optionally, the ratio of the length of the cell 121-a in the first direction X to the maximum length of the cell in the same line in the second direction Y is between 0.4 and 0.6. For example, the ratio of the length of the cell 121-a in the first direction X to the maximum length of the cell in the same line in the second direction Y may be 0.4, 0.58, or 0.6, etc.

In an alternative embodiment of the present invention, the ratio of the length of the cell 121-a in the cell within the isolation zone 121-B in the first direction X to the maximum length of the same straight line in the second direction Y of the cell is smaller than the ratio of the length of the cell 121-a in the cell outside the isolation zone 121-B in the first direction X to the maximum length of the same straight line in the second direction Y of the cell. Through the arrangement, when the mechanical vibration is transmitted on the isolation belt 121-B along the first direction X, the vibration energy loss is more, the mutual transmission of the mechanical vibration on two sides of the isolation belt 121-B can be reduced, and the excitation point of the mechanical vibration can be accurately identified.

In other embodiments of the present invention, the honeycomb cells 121-a on the isolation strip 121-B are filled with sound-absorbing material, which is used to absorb the vibration propagation on the sound-emitting substrate 12, further reducing the mutual transmission of the vibration on both sides of the isolation strip 121-B, and preventing the sound emitted by the transducers 20 on both sides of the isolation strip 121-B from being mixed by the user. Optionally, the sound absorbing material is a foam damping sound absorbing material, and because the density of the foam damping sound absorbing material is low, the influence on the vibration of other parts of the sounding substrate 12 is low, mechanical vibration can be well absorbed, and the mutual transmission of the vibration on two sides of the sound absorbing material is reduced. It should be understood that those skilled in the art can fill the sound-absorbing material at the position on the sound-emitting substrate 12 where the sound vibration transmission needs to be blocked according to the actual sound-emitting requirement, such as between two transducers 20, the center position of the sound-emitting substrate 12, etc., all of which are within the protection scope of the present invention.

Referring to fig. 9, in an alternative embodiment of the present invention, the skin 122 is made of interwoven fiber cloth, and the number of fibers of the skin 122 extending along the second direction Y is greater than or equal to the number of fibers extending along the first direction X. By setting the number of fibers extending in the second direction Y and the number of fibers extending in the first direction X on the skin 122, the number of fibers extending in the second direction Y is greater than or equal to the number of fibers extending in the first direction X. Therefore, when the mechanical vibration is transmitted on the sound substrate 12, the skin 122 can improve the rigidity of the sound substrate 12 in the second direction Y, reduce the energy loss of the mechanical vibration in the second direction Y, and ensure the transmission of the mechanical vibration in the second direction Y.

In another alternative embodiment of the present invention, the skin 122 is made of unidirectional fiber cloth, and the fiber extending direction of the skin 122 is parallel to the second direction Y, so as to improve the rigidity of the sound emitting substrate 12 in the second direction Y, reduce the energy loss of the mechanical vibration in the second direction Y, and ensure the transmission of the mechanical vibration in the second direction Y.

Alternatively, the unidirectional fiber cloth or the interwoven fiber cloth can be made of glass fiber, carbon fiber, glass-carbon mixed fiber, plastic, light aluminum and the like. The thickness of the skin 122 is between 0.1mm and 0.5mm, which not only ensures the strength of the skin 122, but also prevents mechanical vibration from being transmitted easily due to the over-thickness of the skin 122, and ensures the response of the sound-emitting substrate 12 to the mechanical vibration. Optionally, the thickness of the skin 122 is between 0.18mm and 0.36mm, for example, the thickness of the skin 122 may be 0.18mm, 0.25mm, or 0.36mm, etc.

In other alternative embodiments of the present invention, the skins 122 may be made of all interwoven fiber cloth, or all unidirectional fiber cloth, or the skin 122 on one side of the honeycomb core plate 121 is made of interwoven fiber cloth, and the skin 122 on the other side is made of unidirectional fiber cloth, which is not limited in this respect. When the skin 122 is made of interwoven fiber cloth, the number of fibers extending in the second direction Y on the skin 122 is greater than the number of fibers extending in the first direction X, and specifically, the ratio of the number of fibers extending in the second direction Y to the number of fibers extending in the first direction X on the skin 122 is between 5: 1 and 1: 1. This ensures that the skin 122 has a certain stiffness in the first direction X and also ensures that the skin 122 has a higher stiffness in the second direction Y than in the first direction X for transmitting mechanical vibrations. Optionally, the ratio of the number of fibers extending in the second direction Y to the number of fibers extending in the first direction X on the skin 122 is between 2: 1 and 1: 1.

Referring to fig. 4, 5 and 6, in an alternative embodiment of the present invention, the spontaneous acoustic projection display device further includes a supporting plate 40, and two ends of the supporting plate 40 are respectively connected to the frame 30 to fix the supporting plate 40 and the frame 30. The supporting plate 40 abuts against the surface of the at least one transducer 20 away from the sound-emitting substrate 12, so that the transducer 20 can be tightly attached to the sound-emitting substrate 12, the separation or displacement from the sound-emitting substrate 12 due to the vibration of the transducer 20 is prevented, and the service life of the display device is prolonged.

In other alternative embodiments of the present invention, the supporting plate 40 may be sized to cover the entire sound substrate 12, or only one of the transducers 20 or a plurality of the transducers 20, and may be configured by those skilled in the art according to actual production requirements.

Referring to fig. 4, 5 and 10, in an alternative embodiment of the present invention, the self-sounding projection display device further includes a buffer unit 50, wherein the buffer unit 50 is disposed on the sounding substrate 12 and is disposed on a side of the sounding substrate 12 having the transducer 20. The buffer unit 50 is wrapped around at least one transducer 20, and is used for buffering axial vibration generated by the transducer 20 when the transducer 20 is in operation, so as to prevent the transducer 20 from separating or displacing from the sound-emitting substrate 12 due to excessive axial vibration, and ensure the connection between the transducer 20 and the sound-emitting substrate 12.

Specifically, the buffer unit 50 includes a back cover 51 and a spacer 52, the spacer 52 surrounds at least one transducer 20, the back cover 51 covers the spacer 52, and a surface of the back cover 51 abuts against a surface of the transducer 20 away from the sound substrate 12. In order to better prevent the transducer 20 from separating from the sound-emitting substrate 12, the buffer unit 50 may be filled with a sealing buffer material, wherein the sealing buffer material may be a sound-absorbing material to prevent the buffer unit 50 from emitting noise due to the vibration generated by the transducer 20, which affects the audiovisual experience of the user. In the present embodiment, the isolation bars 52 are made of sound damping material, such as EVA foam, etc., which ensures the absorption capability of mechanical vibration.

Referring to fig. 6, 7, 10, 11 and 12, in an alternative embodiment of the present invention, the spontaneous acoustic projection display device further includes a stabilizing unit 60, and the stabilizing unit 60 is disposed on a side of the sound substrate 12 having the transducer 20. Specifically, the stabilizing unit 60 includes a base 61, a plurality of legs 62, and a damping block 63 for connecting the legs 62 and the sound-emitting substrate 12, wherein a receiving groove 611 for receiving the transducer 20 is formed on a surface of the base 61 close to the sound-emitting substrate 12, and the receiving groove 611 is adapted to the shape of the transducer 20 in order to fix the relative position of the transducer 20 and the sound-emitting substrate 12. The plurality of legs 62 are spaced apart and extend outwardly along the circumference of the base 61, and in an alternative embodiment of the present invention, the legs 62 may extend spirally outwardly or radially along the base 61, and those skilled in the art can arrange them according to actual requirements. The number of legs 62 may also be three, four, five, etc. to meet the stability requirements of the base 61.

The end of each leg 62 away from the base 61 is provided with a damping block 63, and the damping block 63 is used to connect the leg 62 and the sound-emitting substrate 12, so as to prevent the stabilizing unit 60 from falling off or shifting due to the mechanical vibration of the transducer 20. When the transducer 20 is an electromagnetic transducer, the electromagnetic transducer is disposed in the accommodating groove 611, so that the driving coil of the electromagnetic transducer 20 is located at the center of the magnetic field and the relative position of the driving coil is kept stable, and the driving coil is prevented from deviating from the center of the magnetic field due to torsional oscillation in the axial direction generated by the electromagnetic transducer, thereby affecting the normal operation of the electromagnetic transducer.

Particularly, the supporting legs 62 are made of a material with a low elastic coefficient, and the supporting legs 62 are of a sheet structure, so that when different supporting legs 62 are respectively subjected to the action of mechanical vibration on the sound-emitting substrate 12, the supporting legs 62 can absorb the mechanical vibration acting on the supporting legs 62, so as to maintain the stable state of the base 61, prevent the base 61 and the electromagnetic transducer arranged in the accommodating groove 611 from deviating from the relative position of the sound-emitting substrate 12, and ensure the normal working state of the electromagnetic transducer.

Referring to fig. 13 and 14, in an alternative embodiment of the present invention, a plurality of transducers 20 are symmetrically disposed on both sides of the sound substrate 12 to realize stereo playback of left and right channels. Specifically, the plurality of transducers 20 may be divided into a plurality of groups, each group having a number between 1 and 4, for example, each group of transducers 20 may have 1, 3, or 4, etc. The transducers 20 are symmetrically arranged on two sides of the sound production substrate 12 about the central axis of the sound production substrate 12, so that when the transducers 20 on the left side and the right side of the sound production substrate 12 generate mechanical vibration, the mutual interference of a left sound channel and a right sound channel when the sound production substrate 12 vibrates can be reduced, and the normal sound production of the transducers 20 on each side is ensured. Alternatively, the transducers 20 may be arranged on the sound emitting substrate 12 in an overall configuration with the ends farther apart and the middle closer together.

In an alternative embodiment of the present invention, the transducers 20 on the same side of the sound generating substrate 12 may be selected from transducers 20 with different properties, and different ranges of vibration frequencies may be excited by the transducers 20 with different properties to extend the frequency response of the sound generating substrate 12.

Other embodiments of the disclosure will be apparent to those skilled in the art from consideration of the specification and practice of the disclosure disclosed herein. This application is intended to cover any variations, uses, or adaptations of the disclosure following, in general, the principles of the disclosure and including such departures from the present disclosure as come within known or customary practice within the art to which the disclosure pertains. It is intended that the specification and examples be considered as exemplary only, with a true scope and spirit of the disclosure being indicated by the following claims.

Claims

1. A self-emissive projection display device, comprising:

the screen comprises a sounding substrate and an optical diaphragm covering one side surface of the sounding substrate and used for receiving and displaying images;

the sounding substrate comprises a honeycomb core plate and a skin, the honeycomb core plate comprises a plurality of honeycomb grids which are staggered along a first direction and a second direction, the first direction is vertical to the second direction, the length of each honeycomb grid in the first direction is smaller than that of each honeycomb grid in the second direction, each honeycomb grid comprises two side walls which are parallel to the second direction, and no side wall which is parallel to the first direction exists, so that the energy loss of mechanical vibration in the first direction is larger than that in the second direction;

the skins cover openings at two ends of the honeycomb grids, the skins are made of interwoven fiber cloth, and the number of fibers extending along the second direction of the skins is larger than or equal to the number of fibers extending along the first direction; or the skin is made of unidirectional fiber cloth, and the fiber extending direction of the skin is parallel to the second direction;

a frame to carry the screen and the plurality of transducers.

2. The display device according to claim 1, wherein two of the cells adjacent in the second direction form a cell, and a ratio of a length of the cell in the first direction to a maximum length of the cell in the same line in the second direction is between 0.4 and 0.7.

3. The display device according to claim 1, wherein the plurality of transducers are symmetrically disposed on both sides of a central axis of the sound emission substrate, the central axis being parallel to the second direction.

4. The display device according to claim 1, wherein a middle region of the honeycomb core panel is provided with a separator extending in the second direction, and a ratio of lengths of cells on the separator in the first direction to the second direction is smaller than a ratio of lengths of cells other than the separator in the first direction to the second direction.

5. The display device according to claim 4, wherein the cells on the barrier tape are filled with a sound absorbing material.

6. The display device according to claim 1, further comprising a support plate, wherein two ends of the support plate are respectively engaged with the frame, and the support plate abuts against a surface of the at least one transducer away from the sound substrate.

7. The display device according to claim 1, further comprising a buffer unit disposed on a side of the sound substrate where the transducer is disposed, wherein the buffer unit comprises a back cover and a spacer, the spacer is disposed around the transducer, and the back cover covers the spacer.

8. The display device according to claim 1, further comprising a stabilizing unit disposed on a side of the sound substrate having the transducer, the stabilizing unit including a base, a plurality of legs, and a damping block for connecting the legs and the sound substrate; the supporting feet are arranged along the circumferential direction of the base at intervals and extend outwards, and the base is provided with a containing groove used for containing the transducer.