CN108462917B - Electromagnetic excitation energy converter, laser projection optical sound screen and synchronous display method thereof - Google Patents

Abstract

The invention discloses an electromagnetic excitation energy converter, a laser projection optical sound screen and a synchronous display method thereof, and relates to the technical field of imaging display and acoustics. The invention uses the hard or flexible laser projection optical screen as the display sound production of the sound production component, uses the electromagnetic excitation energy converter to push the screen or the auxiliary sound production board to make the screen or the auxiliary sound production board vibrate to form acoustic output, and is also provided with bass, middle-pitch and high-pitch strengthening units, and the sound quality which can cover the whole frequency band is played through the processing of a power amplifier and a frequency divider; the sound-picture synchronization technique is also achieved by specific algorithms and software processing. The scheme can control the vibration amplitude of the screen to be invisible to human eyes while exciting the screen to sound, ensures that a display picture is not interfered, forms a laser projection optical sound screen system scheme which can show a high-quality picture and play audiological sound, solves the problems that a traditional box type sound set is large in size, inconvenient to use, and the display picture and the sound are separated, and meets the audiovisual experience requirements of users.

Description

Electromagnetic excitation energy converter, laser projection optical sound screen and synchronous display method thereof

Technical Field

The embodiment of the invention relates to the technical field of imaging display and acoustics, in particular to an electromagnetic excitation energy converter, a laser projection optical acoustic screen and a synchronous display method thereof.

Background

The traditional display device can only display images and can not emit sound, so that the loudspeaker is one of the most basic and important components in the modern audio-visual system, and the quality and the shape of the loudspeaker directly influence the user experience of the audio-visual system. Modern flat panel display devices pursue thinner shapes, larger sizes and truer sound fields, the trend makes traditional speakers have no appearance, the current audio-visual system solutions are mostly ultra-thin flat horn sets integrated with a display, or external SoundBar, or external multi-channel speaker systems, or the tone quality is poor, or the occupied space and the wiring are messy, and the pain point of users can not be solved.

Laser display is an innovative display technology which is started after the traditional flat panel display technology, and has the technical advantages of wide color gamut, long service life, high image quality, easy realization of large-screen display, environmental protection, energy conservation and the like. The product form is a screen made by matching an ultra-short-focus laser projector with a high-quality environment-light-resistant optical film such as a Fresnel film, a black grid film, a micro-lens array film and the like, and the shape of the screen can be a hard rigid back plate compounded behind the optical film and a hard screen made by assembling a shape frame and the like; the optical screen can be hung and tensioned on the frame supporting frame in a spring mode, a magic tape mode, an elastic strip mode and the like, and then the modeling frame is assembled to form the flexible screen.

The sound solution of present laser display system sets up speaker system outside the display screen, and occupation space and wiring are in disorder, and it is extremely inconvenient to use, and product standard size is 16: 9. 100' and the size of a display area in the horizontal direction is 2.21 meters, which is far larger than that of a traditional flat-panel television, and when the external multi-channel loudspeaker system is matched for use, the phenomena of separation and desynchronization of sound and a display picture are obvious, so that the audio-visual experience is seriously influenced. Therefore, a new display screen-sound integrated system needs to be researched, the problems that the traditional box-type sound set is large in size, inconvenient to use, and capable of separating display pictures from sound are solved, and powerful support is provided for promoting the development of the laser display industry.

Disclosure of Invention

The invention aims to research a display and sound production integrated system which utilizes a hard or flexible laser projection optical screen as a sound production component, uses a specific electromagnetic excitation energy converter to push the screen or an auxiliary sound production plate to make the screen or the auxiliary sound production plate vibrate to form acoustic output, is also provided with bass, middle-pitch and high-pitch strengthening units, and plays beautiful sound quality covering full frequency bands through the processing of a power amplifier and a frequency divider; the sound-picture synchronization technique is also achieved by specific algorithms and software processing. The scheme can control the vibration amplitude of the screen to be invisible to human eyes while exciting the screen to sound, ensures that a display picture is not interfered, forms a laser projection optical sound screen system scheme which can show a high-quality picture and play audiological sound, solves the problems that a traditional box type sound set is large in size, inconvenient to use, and the display picture and the sound are separated, and meets the audiovisual experience requirements of users.

In order to achieve the technical effects, the invention adopts the following technical scheme:

the electromagnetic excitation energy converter comprises a metal shell, a magnetic ring/sheet, an excitation coil, an elastic reed and a push arm support, wherein the metal shell is provided with a cavity, the magnetic ring/sheet is tightly attached in the metal shell, the excitation coil is fixed on the surface of the elastic reed and is contained in the cavity of the metal shell, then the elastic reed is connected and fixed with the metal shell, and the push arm support is connected with the geometric center of the surface of the elastic reed; the exciting coil is connected with an external input electric signal through an input terminal.

The further technical scheme is as follows: the metal shell is made of low/medium/high carbon steel, alloy or plastic-metal composite and is concave or linear.

The further technical scheme is as follows: the overall weight of the electromagnetic excitation energy converter is not lower than the equivalent weight of the laser projection display screen with the same contact area.

Meanwhile, the invention also provides a hard laser projection optical sound screen, which comprises the electromagnetic excitation energy converter, a laser display screen, a hard rigid back plate, an elastic suspension system and a screen suspension bracket; the push arm support end of the electromagnetic excitation energy converter is tightly adhered to the hard rigid back plate, and after an electric signal is input, the electromagnetic excitation energy converter pushes the hard rigid back plate to drive the hard rigid back plate to generate physical displacement and deformation so as to form sound output; the metal shell end of the electromagnetic excitation energy converter is tightly adhered to the screen suspension bracket; the laser display screen is connected with the screen suspension bracket through the elastic suspension system, and the laser display screen is supported and fixed to be capable of freely vibrating within a certain range.

The further technical scheme is that; the elastic suspension system is designed into a high-damping shock absorption structure and is made of high-elasticity rubber or elastic reed groups.

The further technical scheme is that; the electromagnetic excitation energy converter groups are symmetrically distributed on the laser display screen, and the distance between the electromagnetic excitation energy converter groups and the edge of the screen is 1/6-1/3 of the side length of the screen.

In addition, the invention also provides a flexible laser projection optical sound screen, which comprises the electromagnetic excitation energy converter, a laser display screen, an elastic suspension system, a screen suspension bracket and an auxiliary sound-emitting plate;

the laser display screen is connected with the screen suspension bracket through an elastic suspension system, and the laser display screen is supported and fixed to be capable of freely vibrating within a certain range;

the end of a push arm bracket of the electromagnetic excitation energy converter is tightly adhered with an auxiliary sound-emitting plate, the auxiliary sound-emitting plate is adhered with the back of a laser display screen, the end of a metal shell of the electromagnetic excitation energy converter is tightly adhered with a screen suspension bracket,

or the auxiliary sound-emitting board is tightly adhered to the screen hanging bracket; the metal shell end of the electromagnetic excitation energy converter is bonded with the back of the laser display screen;

the electromagnetic excitation energy converter is combined with the auxiliary sound-emitting board and then combined with the flexible laser display screen to input an electric signal, and the electromagnetic excitation energy converter pushes the auxiliary sound-emitting board to drive the auxiliary sound-emitting board to generate physical displacement and deformation so as to form sound output.

The further technical scheme is as follows: the elastic suspension system is designed into a high-damping shock absorption structure and is made of high-elasticity rubber or elastic reed groups.

The further technical scheme is as follows: the electromagnetic excitation energy converter groups are symmetrically distributed on the laser display screen, and the distance between the electromagnetic excitation energy converter groups and the edge of the screen is 1/6-1/3 of the side length of the screen.

Finally, the invention provides a method for the simultaneous display of sound pictures of a laser display optical acoustic screen, comprising a rigid laser projection optical acoustic screen according to claim 4 or a flexible laser projection optical acoustic screen according toclaim 7,

the leftmost lower corner of the laser display screen is set as an original point, the total width A of the display screen is set, when a certain position of the display screen emits sound or an object moves, the horizontal direction coordinate X of the display screen is determined through rapid calculation, and when the position is X/A which is 0-1/2 +/-X, the output control enables the sound emitting unit which is the left unit closest to the position to work and the other units not to work; when the position is X/A-1/2-2/2 +/-X, the output control enables the sound production unit closest to the position, namely the right unit, to work and the other units not to work; when X/A is 1/2 + -X, the output control makes the left and right units work simultaneously, wherein X is an adjusting value set according to the requirement.

Compared with the prior art, the invention has the following beneficial effects: the laser projection optical sound screen system mainly researches how to solve the problem of pain point use for users of the traditional sound raising device by a brand new way of converting electric energy into mechanical energy to push a projection screen or an auxiliary sound raising plate to vibrate and make the projection screen or the auxiliary sound raising plate to make the projection screen or the auxiliary sound raising plate produce sound, realizes sound excitation generation, high tone quality and sound-picture synchronization technology by the brand new way, shows high-quality pictures and can play dynamic sound, meets the user audio-visual experience requirements, and relates to the fusion use of knowledge in aspects of electroacoustics, mechanics, assembly technology, human engineering.

The invention uses the hard or flexible laser projection optical screen as the display and sound production integrated system of the sound production component, uses the specific electromagnetic excitation energy converter to push the screen or the auxiliary sound production board to make the screen or the auxiliary sound production board vibrate to form acoustic output, and processes and broadcasts the beautiful sound quality which can cover the full frequency band through the arranged bass, middle-pitch and high-pitch strengthening units, the power amplifier and the frequency divider; the sound-picture synchronization technique is also achieved by specific algorithms and software processing. The scheme can control the vibration amplitude of the screen to be invisible to human eyes while exciting the screen to sound by vibration, ensures that a displayed picture is not interfered, forms a laser projection optical sound screen system scheme which can show a high-quality picture and play a dynamic sound, and meets the audiovisual experience requirements of users.

Drawings

FIG. 1 is a schematic diagram of an electromagnetic excitation energy converter according to an embodiment of the present invention;

FIG. 2 is a schematic view of a hard laser projection optical acoustic screen according to an embodiment of the present invention;

fig. 3(a) and 3(b) are schematic diagrams of three flexible laser projection optical acoustic screens according to embodiments of the present invention;

FIG. 4 is a schematic diagram of a plurality of electromagnetic excitation energy converters interfering with each other when operated in combination.

FIG. 5 is a schematic diagram of a high-quality sound scheme of a four-laser display optical audio screen according to an embodiment of the present invention;

FIG. 6 is a schematic diagram of a high-quality sound scheme of a five-laser display optical audio screen according to an embodiment of the present invention;

FIG. 7 is a schematic diagram of a conventional laser projection display sound;

FIG. 8 is a schematic diagram of a method for synchronously displaying audio frames on an opto-acoustic screen by six laser beams according to an embodiment of the present invention.

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 with reference to the following 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.

Example one

As shown in fig. 1, the electromagnetic excitation energy converter is composed of a metal casing 1, a ferromagnetic ring/sheet 2, anexcitation coil 3, an elastic spring 4, and apush arm support 5, wherein the ferromagnetic ring/sheet 2 is tightly attached to the metal casing 1, theexcitation coil 3, the elastic spring 4, and thepush arm support 5 are bonded by gluing, riveting, screwing, and the like, and then are connected and fixed to the metal casing 1 through the elastic spring 4.

Specifically, the electromagnetic excitation energy converter is a device for specifically converting electric energy into mechanical energy, and the converter is used for pushing a screen or an auxiliary sound-emitting plate to vibrate, and each micro element of the screen or the auxiliary sound-emitting plate radiates micro-disordered uncorrelated signals with the same frequency and different amplitudes and phases to form acoustic output. The structure of the device consists of a metal shell, a ferromagnetic ring/sheet, an excitation coil, an elastic reed and a push arm support, wherein an electric signal with specific frequency is loaded through an input terminal of the excitation coil, and the combination of the excitation coil, the elastic reed and the push arm support can generate linear reciprocating motion under the combined action of a strong magnetic field and the electric signal.

① the requirement of the whole weight of the converter is not lower than the equivalent weight of the laser projection display screen with the same contact area, and can approach to infinity;

② the metal shell is made of low/medium/high carbon steel, alloy or plastic-metal composite, and has a concave or linear shape;

③ the strong magnetic ring/sheet is made of samarium cobalt magnet, ferrite magnet, neodymium iron boron magnet, and alnico magnet, and is tightly adhered in the metal shell;

④ the exciting coil is a closed enameled conductive coil of paper roll, resin plate roll, and metal roll, and is connected with external input electrical signal via input terminal;

⑤ the elastic reed is elastic metal, elastic resin sheet or their combination, has enough rigidity and flexibility, can respond quickly when receiving the push/pull force of the exciter, can respond quickly when the force and direction change;

⑥ excitation coil is fixed on the surface of the spring leaf and is put into the cavity of the metal shell, then the spring leaf is connected and fixed with the metal shell, finally the push arm support is connected with the geometric center of the surface of the spring leaf, the gravity center of each unit of the assembly needs to be kept on the same straight line as much as possible;

⑦ the thickness of the converter is designed to be less than or equal to 30mm according to the shape of the laser display screen product to realize ultra-thinning of the whole system.

Example two

As shown in fig. 2, the hard laser projection optical acoustic screen is composed of alaser display screen 6, a hardrigid back plate 7, an electromagneticexcitation energy converter 8, anelastic suspension system 9 and ascreen suspension bracket 10, wherein thelaser display screen 6 and the hardrigid back plate 7 are tightly compounded, one end of the electromagneticexcitation energy converter 8 is connected with the hardrigid back plate 7, and the other end is connected with thescreen suspension bracket 10.

Specifically, the hard laser projection optical sound screen which produces sound by using the electromagnetic excitation energy converter is used for firmly combining the electromagnetic excitation energy converter and the hard rigid back plate, and after an electric signal is input, the electromagnetic excitation energy converter pushes the hard rigid back plate to drive the hard rigid back plate to produce physical displacement and deformation so as to form sound output.

① the rigid back plate is a sandwich-shaped plate, which is a hollow aluminum honeycomb core aluminum plate or an aluminum plastic plate filled with plastic materials;

② the end of the push arm bracket of the electromagnetic excitation energy converter is tightly bonded with the hard rigid backboard by using low damping adhesive tape or glue, the end of the metal shell of the electromagnetic excitation energy converter is tightly bonded with the screen suspension bracket by using high damping adhesive tape, and the metal shell is fastened by screws/rivets when necessary;

③ the laser display screen is connected with the screen suspension bracket through an elastic suspension system, which supports and fixes the display screen to freely vibrate in a certain range, the elastic suspension system is designed as a high damping shock absorption structure made of high elastic rubber or elastic spring sheet set, and can isolate and attenuate the mechanical vibration transmitted to the outside of the screen, and eliminate the system resonance and noise;

④, determining the distribution position of the electromagnetic excitation energy converter on the screen surface by modal analysis and exhaustion method, wherein the electromagnetic excitation energy converter groups are symmetrically distributed on the screen surface, and the distance between the electromagnetic excitation energy converter groups and the edge of the screen is preferably 1/6-1/3 of the side length of the screen, so that the electromagnetic excitation energy converter groups do not interfere with each other during working, and the distance between the electromagnetic excitation energy converter groups and the edge of the screen is too long to cause the separation of sound and display images, and the position of the transducer is reasonably adjusted to ensure that each sound channel can be clearly identified and the sound-producing center is located on the central axis of the screen when multiple;

⑤ the proper power matching makes the displacement of the screen in the vertical axis left and right direction under the action of the electromagnetic exciting energy converter need to be controlled not less than 1/4 visible light wavelength, the recovery time of each sub-displacement stroke is not more than 0.1 second, and the subjective influence of vibration and sound production on the display picture is eliminated by utilizing afterglow effect.

EXAMPLE III

As shown in fig. 3, the flexible laser projection optical acoustic screen is composed of alaser display screen 6, an electromagneticexcitation energy converter 8, anelastic suspension system 9, ascreen suspension bracket 10 and an auxiliarysound emitting plate 11, wherein after the electromagneticexcitation energy converter 8 and the auxiliarysound emitting plate 11 are combined into a whole, one end of the whole is connected with thelaser display screen 6, and the other end is connected with thescreen suspension bracket 10. Specifically, as shown in fig. 3(a), the end of the push arm bracket of the electromagnetic excitation energy converter is tightly bonded to the auxiliary sound generating plate, the auxiliary sound generating plate is bonded to the back of the laser display screen, and the end of the metal shell of the electromagnetic excitation energy converter is tightly bonded to the screen suspension bracket, or, as shown in fig. 3(b), the end of the push arm bracket of the electromagnetic excitation energy converter is tightly bonded to the auxiliary sound generating plate, and the auxiliary sound generating plate is tightly bonded to the screen suspension bracket; and the metal shell end of the electromagnetic excitation energy converter is bonded with the back of the laser display screen.

The electromagnetic excitation energy converter is firmly combined with the auxiliary sound-generating board and then combined with the flexible laser projection screen, and after an electric signal is input, the electromagnetic excitation energy converter pushes the auxiliary sound-generating board to drive the auxiliary sound-generating board to generate physical displacement and deformation so as to form sound output.

① the auxiliary sound-emitting board is a sandwich-shaped plate, which is a hollow aluminum honeycomb core aluminum plate or aluminum honeycomb core paperboard, or an aluminum plastic plate filled with plastic materials;

② the auxiliary sound board can be used to make sound, the low damping adhesive tape or glue is used to bond the support end of the push arm of the converter with the auxiliary sound board tightly, the edge of the auxiliary sound board is bonded with the screen hanging support through high elasticity flexible material such as rubber strip, the rubber strip is provided with a hole;

the optical diaphragm can also make a sound through the auxiliary sound-emitting plate, the end of the push arm bracket of the converter is tightly adhered to the auxiliary sound-emitting plate by using low-damping adhesive tape or glue, and the auxiliary sound-emitting plate is compounded with the back of the laser display screen through flexible foam adhesive tape and the like; tightly bonding the end of the metal shell of the converter with the screen suspension bracket by using a high-damping adhesive tape, and fastening by using screws/rivets when necessary;

③ the laser display screen is connected with the screen suspension bracket through an elastic suspension system, which supports and fixes the display screen to freely vibrate in a certain range, the elastic suspension system is designed as a high damping shock absorption structure made of high elastic rubber or elastic spring sheet set, and can isolate and attenuate the mechanical vibration transmitted to the outside of the screen, and eliminate the system resonance and noise;

④, determining the distribution position of the electromagnetic excitation energy converter on the screen surface by modal analysis and exhaustion method, wherein the electromagnetic excitation energy converter groups are symmetrically distributed on the screen surface, and the distance between the electromagnetic excitation energy converter groups and the edge of the screen is preferably 1/6-1/3 of the side length of the screen, so that the electromagnetic excitation energy converter groups do not interfere with each other during working, and the distance between the electromagnetic excitation energy converter groups and the edge of the screen is too long to cause the separation of sound and display images, and the position of the transducer is reasonably adjusted to ensure that each sound channel can be clearly identified and the sound-producing center is located on the central axis of the screen when multiple;

⑤ the proper power matching makes the displacement of the screen in the vertical axis left and right direction under the action of the electromagnetic exciting energy converter need to be controlled not less than 1/4 visible light wavelength, the recovery time of each sub-displacement stroke is not more than 0.1 second, and the subjective influence of vibration and sound production on the display picture is eliminated by utilizing afterglow effect.

Example four

As shown in fig. 5, one example of the high sound quality solution of the laser display optical acoustic screen is that the viewing angle is the back of the screen, and thelaser display screen 6, the electromagneticexcitation energy converter 8, thescreen suspension bracket 10, and the auxiliarysound emitting plate 11 constitute, wherein the electromagneticexcitation energy converter 8 may be a single or a combination of multiple ones, and together constitute the technical solution capable of covering the excellent sound quality of low, medium, and high full frequency bands under the action of the frequency divider.

As shown in fig. 4, the plurality of electromagnetic excitation energy converters are shown to interfere with each other when operating in combination, and the interference is serious, slight and no in sequence from top to bottom.

EXAMPLE five

As shown in fig. 6, another example of the high sound quality solution of the laser display optical acoustic screen is that the viewing angle is the back of the screen, and the screen is composed of alaser display screen 6, anenergy converter 8, ascreen suspension bracket 10, an auxiliarysound emitting plate 11 and a second auxiliarysound emitting plate 12, wherein theenergy converter 8 may be a single or a combination of a plurality of energy converters, the auxiliarysound emitting plate 11 and the second auxiliarysound emitting plate 12 may be an integral or separable, and together form a technical solution capable of covering the excellent sound quality of low, medium and high full frequency bands under the action of a frequency divider.

In the fourth and fifth embodiments, independent bass, middle-pitch, treble enhancing units and their combinations are provided, the energy converter excites the screen or the auxiliary sound-generating board to generate sound respectively, and the fine sound quality covering the full frequency band is realized by frequency division processing and electronic frequency division comprehensive frequency response compensation according to the characteristics of the screen.

① in the hard laser projection optical sound screen system, the combination of energy converter and hard rigid backboard is used as the medium-low frequency band sound unit, the combination of energy converter and auxiliary sound board is used as the low-frequency and high-frequency band sound unit, to realize the sound domain full frequency band coverage;

the installation mode of the energy converter and the auxiliary sound-emitting board is the same as that of the flexible laser projection optical sound screen;

in a flexible laser projection optical sound screen system, the combination of an energy converter and an auxiliary sound-generating board is used as a low-frequency, medium-frequency and high-frequency band sound-generating unit to realize sound-range full-frequency-band coverage;

the auxiliary sound-emitting board with different physical characteristics such as length-width ratio, density, area, thickness, rigidity, deflection and the like is set as an independent low-frequency, medium-frequency and high-frequency band sound-emitting unit, and is characterized in that the length-width ratio is larger than 1.0 and smaller than 3.0, under the condition of using the same energy converter, an aluminum honeycomb core aluminum board with higher density is used for facilitating sound emission of medium and low frequency bands, an aluminum honeycomb core paperboard honeycomb with low density is used for facilitating sound emission of low and high frequency bands, and the thickness increase of the aluminum honeycomb core paperboard honeycomb is used for facilitating sound emission of high frequency bands;

②, determining the distribution position of the electromagnetic excitation energy converter on the screen surface by modal analysis and exhaustion method, wherein the electromagnetic excitation energy converter groups are symmetrically distributed on the screen surface, and the distance between the electromagnetic excitation energy converter groups and the edge of the screen is preferably 1/6-1/3 of the side length of the screen, so that the electromagnetic excitation energy converter groups do not interfere with each other during working, and the distance between the electromagnetic excitation energy converter groups and the edge of the screen is too long to cause the separation of sound and display images, and the position of the transducer is reasonably adjusted to ensure that each sound channel can be clearly identified and the sound-producing center is located on the central axis of the screen when multiple;

when independent bass, alto and treble strengthening units are arranged, the alto and treble units are placed in the middle of a screen, the bass and treble units are placed on two sides of the screen or at the lower end of the screen, and the height of a sounding center is 1.0-1.3 meters away from the ground and is equal to the ear height of a Chinese seated person;

③ the frequency divider is designed to be 100-500 Hz and 6000-10000 Hz according to the frequency response curve, subjective auditory sensation and other acoustoelectric characteristics.

④ use digital signal processor to compensate frequency response of electronic frequency division synthesis to meet the requirement of flat and straight frequency response curve.

EXAMPLE six

Sound-picture synchronization technology for laser display optical sound screen

Some music contains left and right channel information when recording, and the sound of the left channel can be output through the left speaker during playing, and the sound of the right channel can be output through the right speaker during playing, so that a stereo effect is formed. The common television programs and films have no corresponding arrangement, namely when a certain position of a display picture is sounded or an object moves, the sounding center of the system is always positioned on the central axis of the display picture, and the sound-picture separation phenomenon is particularly prominent when a laser display large-screen video is watched.

Therefore, a sound-picture synchronization technology is researched, an input display signal source can be analyzed, the lower left corner of a display picture is taken as an original point, the total width A of the display picture is displayed, when sound is emitted or object motion is judged at a certain position of the display picture, the horizontal direction coordinate X of the display picture is determined through fast calculation, and when the position is X/A which is 0-1/2 +/-X (X is set according to needs), the output control enables a sound production unit which is the nearest sound production unit to work and other units do not work; when the position of X/A is 1/2-2/2 +/-X (X is set according to needs), the output control enables the sound production unit closest to the X/A, namely the right unit, to work and the other units not to work; when the X/A is 1/2 +/-X (X is set according to requirements), the output control enables the left and right side units to work simultaneously; when the object of the display picture is judged to move along a certain track, the method is similarly used for controlling the sequence switch output of the sounding unit so as to realize the sound synchronous control technology of the moving picture.

Fig. 7 shows a conventional laser projection display-sound solution, and fig. 8 shows an embodiment of a laser display optical acoustic screen after applying the sound-picture synchronization technique.

The technical scheme is adopted to manufacture a display and sound production integrated system which utilizes a hard or flexible laser projection optical screen as a sound production component, a specific electromagnetic excitation energy converter is used for pushing the screen or an auxiliary sound production plate to make the screen or the auxiliary sound production plate vibrate to form acoustic output, and the acoustic output is processed and played through a low-pitch, middle-pitch and high-pitch strengthening unit, a power amplifier and a frequency divider which are arranged to give out beautiful sound quality capable of covering a full frequency band; the sound-picture synchronization technique is also achieved by specific algorithms and software processing. The scheme can control the vibration amplitude of the screen to be invisible to human eyes while exciting the screen to sound by vibration, ensures that a displayed picture is not interfered, forms a laser projection optical sound screen system scheme which can show a high-quality picture and play a dynamic sound, and meets the audiovisual experience requirements of users.

According to GB/T9396-1996 'method for testing main performance of loudspeaker', GB 7313-87 'minimum performance requirement and measurement method for high fidelity loudspeaker system', SJ/T11348-, DTS and THX are standard sound listening, and a sound-picture synchronization technology can be obviously subjectively perceived. Meanwhile, the system is thin and small in occupied size, the problems that a traditional box type sound box is large in size, inconvenient to use, and capable of displaying pictures and separating sound are solved, and the functions of the screen panel, namely image display and sound source are achieved.

Although the invention has been described herein with reference to illustrative embodiments thereof, it should be understood that numerous other modifications and embodiments can be devised by those skilled in the art that will fall within the spirit and scope of the principles of this disclosure. More specifically, various variations and modifications may be made to the component parts and/or arrangements of the subject combination arrangement within the scope of the disclosure herein. In addition to variations and modifications in the component parts and/or arrangements, other uses will also be apparent to those skilled in the art.

Claims (9)

1. Electromagnetic excitation energy converter group, its characterized in that: each electromagnetic energy converter comprises a metal shell, a magnetic ring/sheet, an excitation coil, an elastic reed and a push arm support, wherein the metal shell is provided with a cavity, the magnetic ring/sheet is tightly attached in the metal shell, the excitation coil is fixed on the surface of the elastic reed and is contained in the cavity of the metal shell, then the elastic reed is connected and fixed with the metal shell, and the push arm support is connected with the geometric center of the surface of the elastic reed; the electromagnetic excitation energy converter group is arranged on a laser display screen, the excitation coil is connected with an external input electric signal through an input terminal, the leftmost lower corner of the laser display screen is set as an original point, the total width A of a display picture is set, when a certain position of the display picture is sounded or an object moves, the horizontal direction coordinate X of the display picture is determined through rapid calculation, and when the position is in the X/A range of 0-1/2 +/-X, the output control enables an electromagnetic excitation energy converter which is close to the position to work, namely a left unit, and the other units do not work; when the X/A is 1/2-2/2 +/-X, the output control enables the electromagnetic excitation energy converter which is close to the X/A, namely the right unit, to work and the other units not to work; when the power is at X/A-1/2 + -X, the output control makes the electromagnetic excitation energy converters on the left and right sides work simultaneously, wherein X is an adjusting value set according to needs.

2. The group of electromagnetically excited energy converters of claim 1, wherein: the metal shell is made of alloy or plastic-metal composite and is concave or straight.

3. The group of electromagnetically excited energy converters of claim 1, wherein: the overall weight of the electromagnetic excitation energy converter is not lower than the equivalent weight of the laser projection display screen with the same contact area.

4. Stereoplasm laser projection optics stereo set screen, its characterized in that: it comprises the group of electromagnetic excitation energy converters according to any one of claims 1 to 3, and a laser display screen, a rigid back plate, an elastic suspension system and a screen suspension bracket; the push arm support end of the electromagnetic excitation energy converter is tightly adhered to the hard rigid back plate, and after an electric signal is input, the electromagnetic excitation energy converter pushes the hard rigid back plate to drive the hard rigid back plate to generate physical displacement and deformation so as to form sound output; the metal shell end of the electromagnetic excitation energy converter is tightly adhered to the screen suspension bracket; the laser display screen is connected with the screen suspension bracket through the elastic suspension system, and the laser display screen is supported and fixed to be capable of freely vibrating within a certain range.

5. The rigid laser projection optical acoustic screen of claim 4, wherein: the elastic suspension system is designed into a high-damping shock absorption structure and is made of high-elasticity rubber or elastic reed groups.

6. The rigid laser projection optical acoustic screen of claim 4, wherein: the electromagnetic excitation energy converters are symmetrically distributed on the laser display screen, and the distance between the electromagnetic excitation energy converters and the edge of the screen is 1/6-1/3 of the side length of the screen.

7. Flexible laser projection optics stereo set screen, its characterized in that: comprising a group of electro-magnetically excited energy converters as claimed in any one of claims 1 to 3, and a laser display screen, an elastic suspension system, a screen suspension support and an auxiliary sound board;

the laser display screen is connected with the screen suspension bracket through an elastic suspension system, and the laser display screen is supported and fixed to be capable of freely vibrating within a certain range;

the end of a push arm bracket of the electromagnetic excitation energy converter is tightly adhered with an auxiliary sound-emitting plate, the auxiliary sound-emitting plate is adhered with the back of a laser display screen, the end of a metal shell of the electromagnetic excitation energy converter is tightly adhered with a screen suspension bracket,

or the auxiliary sound-emitting board is tightly adhered to the screen hanging bracket; the metal shell end of the electromagnetic excitation energy converter is bonded with the back of the laser display screen;

the electromagnetic excitation energy converter is combined with the auxiliary sound-emitting board and then combined with the flexible laser display screen to input an electric signal, and the electromagnetic excitation energy converter pushes the auxiliary sound-emitting board to drive the auxiliary sound-emitting board to generate physical displacement and deformation so as to form sound output.

8. The flexible laser projection optical acoustic screen of claim 7, wherein: the elastic suspension system is designed into a high-damping shock absorption structure and is made of high-elasticity rubber or elastic reed groups.

9. The flexible laser projection optical acoustic screen of claim 7, wherein: the electromagnetic excitation energy converters are symmetrically distributed on the laser display screen, and the distance between the electromagnetic excitation energy converters and the edge of the screen is 1/6-1/3 of the side length of the screen.

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