CN117579797A - Projection device and system, and projection method - Google Patents
Projection device and system, and projection method Download PDFInfo
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Abstract
The embodiment of the disclosure discloses a projection device and system and a projection method. In a specific embodiment of the present disclosure, a projection apparatus includes: the system comprises a controller, a lens assembly and at least one row of first ultrasonic transducer units, wherein the lens assembly projects image signals to a projection screen in response to a control command of the controller; when the lens assembly projects an image signal, the first ultrasonic transducer unit emits an acoustic wave signal toward the projection screen to be reflected to the projection area. This embodiment achieves sound-to-picture homology by providing at least one array of first ultrasound transducer elements on the projection device and using them to emit sound wave signals towards the projection screen for reflection to the projection area.
Description
Technical Field
The present disclosure relates to the field of projection display technology. And more particularly, to a projection apparatus and system, and a projection method.
Background
A projector is a device that can project images or videos onto a curtain or screen, and due to the specificity of its imaging principle, audio-visual different sources are a problem of projection in the past. The current improvement direction is: the projection screen is added, so that the projection screen has a sound production function, but the vibration sound production of the projection screen can reduce the display stability; the projector only projects pictures and is additionally provided with a home theater system, but the cost is high and the portability is not enough; the reverberation sense and the space sense of the projector loudspeaker are improved, but the problem that the sound image and the picture position are not uniform still cannot be solved, the picture of the front screen is seen to hear the sound source to be positioned on the projector, and the picture separation sense is strong.
Therefore, there is a need for a projection apparatus that can simultaneously achieve sound-image synchronization, does not affect image quality, and fully retains the original advantages of the projector.
Disclosure of Invention
An object of the present disclosure is to provide a display device and a sounding method thereof to solve at least one of the problems of the prior art.
In order to achieve the above purpose, the present disclosure adopts the following technical scheme:
a first aspect of the present disclosure provides a projection apparatus, comprising: a controller, a lens assembly and at least one first ultrasonic transducer unit,
the lens assembly projects an image signal to the projection screen in response to a control command of the controller;
when the lens assembly projects an image signal, the first ultrasonic transducer unit emits an acoustic wave signal toward the projection screen to be reflected to the projection area.
In some alternative embodiments, the angle between the plane perpendicular to the central axis of the lens assembly and the plane in which the first ultrasound transducer unit lies is acute when the lens assembly projects an image signal.
In some alternative embodiments, the first ultrasound transducer unit is arranged on the housing of the projection device,
the housing part provided with the first ultrasonic transducer unit is a movable component, so that when the lens component projects image signals, the included angle between the surface perpendicular to the central axis of the lens component and the plane in which the first ultrasonic transducer unit is arranged is an acute angle, or
The shell part provided with the first ultrasonic transducer unit is a fixed inclined plane, and an included angle between a plane perpendicular to the central axis of the lens assembly and the plane where the first ultrasonic transducer unit is located is an acute angle.
In some alternative embodiments, the first ultrasound transducer unit is located below the lens assembly.
In some of the alternative embodiments of the present invention,
the first ultrasonic transducer units are positioned at two sides of the lens assembly, and the first ultrasonic transducer units at two sides respectively output a left channel sound wave signal and a right channel sound wave signal.
In some alternative embodiments, the projection device further comprises: at least one column of second ultrasound transducer units disposed above the lens assembly to emit sound waves toward a top surface of the projection environment for reflection to a projection area within the projection environment.
In some alternative embodiments, the included angle is greater than 0 ° and less than or equal to 30 °.
In some alternative embodiments, the arrangement mode of the plurality of first ultrasonic transducer units in at least one column of first ultrasonic transducer units is vertical arrangement or zigzag arrangement, and the acoustic wave signals emitted by the same column of first ultrasonic transducer units are the same.
A second aspect of the present disclosure provides a projection system comprising:
a projection device according to the above;
the projection curtain is used for projecting light rays emitted by the projection equipment and reflecting sound wave signals emitted by the projection equipment.
A third aspect of the present disclosure provides a projection method, applied to the projection apparatus described above, comprising:
at least one array of first ultrasonic transducer units arranged on the projection device is controlled, and when the lens assembly projects image signals, sound wave signals are emitted towards the projection screen to be reflected to a projection area.
In some alternative embodiments, the projection method further comprises:
obtaining a film watching mode, wherein the film watching mode is a single person mode or a multi-person mode;
when the film watching mode is a single person mode, the sound wave signals are controlled so that the phases of the sound wave signals received by the projection area are the same,
when the film watching mode is a multi-person mode, the projection area is set to be a plurality of listening areas, and the waveforms of the sound wave signals are controlled so that the phases of the sound wave signals received by the listening areas are the same.
In some alternative embodiments, the projection method further comprises:
simultaneously emitting a picture signal and an acoustic wave signal,
the exit delay time of the acoustic wave signal relative to the picture signal is adjusted according to a predetermined delay in response to a first operation by a user.
The beneficial effects of the present disclosure are as follows:
aiming at the existing problems at present, the projection equipment, the system and the projection method are formulated, at least one row of first ultrasonic transducer units are provided in the projection equipment, and when an image is transmitted by a lens assembly, sound wave signals are emitted towards a projection screen by the first ultrasonic transducer units and reflected to a projection area, so that a viewer feels sound emitted by the image from the projection screen, sound and picture synchronization is realized, and more natural immersive experience is brought; in addition, the characteristic that sound has directivity can be utilized, transmitted sound is limited to a required area, the privacy of the sound is improved, and the portable sound box is simple in structure, good in portability and wide in application prospect.
Drawings
The following describes in further detail the specific embodiments of the present disclosure with reference to the drawings.
FIG. 1 illustrates a schematic side view of a projection device emitting sound waves to a projection screen according to an embodiment of the present disclosure;
FIG. 2 shows a schematic perspective view of a projection device according to an embodiment of the present disclosure;
FIG. 3 shows a schematic side view of a projection device according to an embodiment of the present disclosure;
fig. 4-5 show schematic diagrams of a plurality of columns of first ultrasound transducer units in a projection device according to an embodiment of the present disclosure;
FIG. 6 shows a schematic front view of a projection device according to another embodiment of the present disclosure;
FIG. 7 shows a schematic side view of a projection device according to another embodiment of the present disclosure;
FIG. 8 illustrates a schematic side view of a projection device emitting sound waves toward a projection screen according to another embodiment of the present disclosure;
FIG. 9 shows a schematic front view of a projection device according to another embodiment of the present disclosure;
FIG. 10 shows a schematic side view of a projection device according to another embodiment of the present disclosure;
FIG. 11 shows a schematic block diagram of a projection method according to an embodiment of the disclosure;
fig. 12 shows a schematic diagram of a multi-person mode in a projection method according to an embodiment of the present disclosure.
Detailed Description
In order to more clearly illustrate the present disclosure, the present disclosure is further described below in connection with the preferred embodiments and the accompanying drawings. Like parts in the drawings are designated by the same or similar reference numerals. It is to be understood by persons of ordinary skill in the art that the following detailed description is illustrative and not restrictive, and should not be taken as limiting the scope of the present disclosure.
It should be noted that, in this disclosure, the terms "having," "including," "comprising," and the like are all open-ended, i.e., when a module is described as "having," "including," or "comprising" a first element, a second element, and/or a third element, it is intended that the module include other elements in addition to the first element, the second element, and/or the third element.
In the present specification, ordinal numbers such as "first", "second", "third", etc. are provided to avoid mixing of constituent elements, and are not limited in number.
To solve one of the above problems, an embodiment of the present disclosure provides a projection apparatus including: a controller, a lens assembly and at least one first ultrasonic transducer unit,
the lens assembly projects an image signal to the projection screen in response to a control command of the controller;
when the lens assembly projects an image signal, the first ultrasonic transducer unit emits an acoustic wave signal toward the projection screen to be reflected to the projection area.
In this embodiment, at least one column of the first ultrasonic transducer units is provided in the projection device, and when the lens assembly transmits an image, the first ultrasonic transducer units are utilized to emit sound wave signals towards the projection screen so as to reflect the sound wave signals to the projection area, so that a viewer can feel the sound of the image from the projection screen, sound-image synchronization is realized, and the device has a simple structure and good portability.
In a specific embodiment, referring to fig. 1, in an exemplary projection environment, e.g., a living room, a projection device 10 is installed, the projection device 10 includes a controller (not shown), a lens assembly 101, and at least one array of first ultrasound transducer units 102. In front of the projection apparatus 10, a projection screen 20 for projecting an image signal from the lens assembly 101 to present a projection screen is installed, and in front of the projection screen, a projection area of a projection environment is formed.
It should be noted that, in the embodiment of the present disclosure, the projection screen 20 refers to an area capable of displaying a picture by receiving the picture light transmitted by the lens assembly 101, which may be in the form of a curtain independent of a wall surface as shown in fig. 1, or may be a white wall surface. In other words, the "projection screen" in the present disclosure is not limited to the "projection curtain", but is all display media or display devices capable of presenting a transmission screen, and will not be described in detail below.
In particular to the projection apparatus 10 of the present example, the lens assembly 101 projects an image signal to a projection screen in response to a control command of a controller.
In particular, when the lens assembly 101 projects an image signal, the first ultrasonic transducer unit 102 emits an acoustic wave signal toward the projection screen 20 so as to be reflected to a projection area.
The speaker in the ultrasonic transducer unit 102 may be, for example, a piezoelectric speaker, and includes an upper electrode, a lower electrode and a middle piezoelectric layer, where the upper electrode and the lower electrode are respectively covered on the upper and lower sides of the piezoelectric material, and after the electrodes are energized, an electric field is applied to the piezoelectric material, so that the piezoelectric material generates deformation and sounds under the action of the electric field. The piezoelectric layer material may be a film type piezoelectric ceramic PZT, a PVDF film, or the like. The ultrasonic transducer unit 102 has high directivity as a sound source.
In the embodiment of the disclosure, by utilizing the high directivity characteristic of the sound wave emitted from the ultrasonic transducer 102, when the lens assembly 101 projects an image signal, the first ultrasonic transducer unit 102 emits the sound wave signal toward the projection screen 20 to reflect the sound wave signal to the projection area, so that the effect that the sound comes from the projection screen 20 is formed, and the real sound-image homologous effect is realized only by a simple structure.
The light beam propagates along a straight line, and has a strong directivity, and in order to secure the effect of projecting a screen, the lens in the lens assembly 101 of the projection apparatus 10 tends to face the projection screen when projecting an image signal. In particular, in the embodiment of the present disclosure, in order to enable the acoustic wave signal emitted from the first ultrasonic transducer unit 102 to be emitted to the projection screen, referring to fig. 2 and 3, when the lens assembly 101 projects the image signal to the projection screen, an included angle between a plane perpendicular to the central axis of the lens assembly 101 and a plane in which the first ultrasonic transducer unit 102 is located is an acute angle.
In particular to the present example, referring to fig. 2 and 3, the first ultrasound transducer unit 102 is provided on the housing 103 of the projection device 10. Such an arrangement can avoid disturbing the directivity of the acoustic wave signal, as compared with the arrangement inside the housing. Also shown in fig. 3 is an acoustic port 113 to provide protection for the first ultrasonic transducer unit 102 while not affecting the acoustic path of the acoustic signal.
Meanwhile, referring to fig. 2 and 3, the housing portion provided with the first ultrasonic transducer unit 102 is a fixed inclined surface, and the inclination direction of the fixed inclined surface is set as: the included angle θ between the plane perpendicular to the central axis of the lens assembly 101 and the plane in which the first ultrasonic transducer unit 102 is located is an acute angle. More preferably, the angle θ is greater than 0 ° and equal to or less than 30 °.
By setting the housing portion provided with the first ultrasonic transducer unit 102 to satisfy the above-described inclination relationship, effective reflection of the acoustic wave signal to the viewing area is ensured.
Specifically, with continued reference to fig. 2, the first ultrasound transducer unit 101 is located below the lens assembly 101.
It should be noted that the present disclosure is not intended to place the first ultrasonic transducer unit 102 on a fixed incline. That is, the housing portion provided with the first ultrasonic transducer unit 102 is not necessarily fixed.
Optionally, the housing portion provided with the first ultrasound transducer unit 102 is a movable component, and the portion is adjustable such that an angle between a plane perpendicular to a central axis of the lens assembly 101 and a plane in which the first ultrasound transducer unit 102 is located is an acute angle when the lens assembly 101 projects an image signal.
When the housing portion provided with the first ultrasonic transducer unit 102 is a movable component, the portion may also be provided as a telescopically controlled movable component. With this arrangement, when the projection apparatus is placed at a lower position such as a desk top, the housing portion can be extended beyond the lens assembly 101 so that the lens assembly 101 is not located on the propagation path of the acoustic signal when the acoustic signal is emitted obliquely upward. For convenience of illustration, the drawings take fixed inclined planes as examples, and are not repeated herein.
In the embodiment of the present disclosure, the arrangement manner and the arrangement shape of the first ultrasonic transducer unit 102 may be flexibly set according to the overall space of the projection apparatus.
Specifically, as shown in fig. 2 and 4, the plurality of first ultrasonic transducer units in at least one column of first ultrasonic transducer units are arranged in a vertical manner on the fixed substrate 112. At this time, a column of the first ultrasonic transducer units is a straight line column along the vertical direction, specifically, see the straight line in fig. 4. The overall shape of the device can be rectangular as shown in fig. 2, or circular as shown in fig. 4.
Alternatively, referring to fig. 5, the plurality of speakers in at least one column of the first ultrasonic transducer units are arranged in a meander line manner on the fixed substrate 112, where a column of the first ultrasonic transducer units is a meander line column, specifically, see the meander line in fig. 5. The overall shape may be arranged as a rectangle as shown in fig. 5.
In order to facilitate control of the output signals of the first ultrasonic transducer units 102, the acoustic wave signals emitted by the same column of first ultrasonic transducer units are identical.
The projection device may further comprise a second ultrasound transducer unit, considering that a more stereoscopic auditory sensation is desired to be heard in the projection region, more particularly a "sky sound" from above.
In another alternative embodiment, referring to fig. 6, 7 and 8, the projection device further comprises: at least one column of second ultrasound transducer units 104, the second ultrasound transducer units 104 being arranged above the lens assembly 101 to emit sound waves towards the top surface of the projection environment for reflection to a projection area within the projection environment.
Optionally, the housing portion provided with the second ultrasound transducer unit 104 is a fixed inclined surface, which is inclined upward. Referring to the broken line of fig. 7, for convenience of design, the plane of the fixed inclined surface is perpendicular to the plane of the housing portion in which the first ultrasonic transducer unit is disposed, so as to ensure effective reflection of the acoustic wave signal to the viewing area. Of course, the relation of the angle between the housing portion provided with the second ultrasonic transducer unit and the housing portion provided with the first ultrasonic transducer unit is not limited thereto, as long as the inclination angle for the purpose of effective reflection can be achieved.
The arrangement manner and the arrangement shape of the second ultrasonic transducer unit 104 can be flexibly set according to the whole space of the projection device.
The arrangement manner of the plurality of first ultrasonic transducer units in the at least one row of second ultrasonic transducer units is a vertical arrangement or a zigzag arrangement, and the specific arrangement direction is similar to that shown in fig. 4 and 5, and is not described herein.
In another alternative embodiment, in order to be able to feel a stereo effect, referring to fig. 9 and 10, the first ultrasonic transducer units are located at both sides of the lens assembly, and the first ultrasonic transducer units 102-1 and 102-2 at both sides output left and right channel sound wave signals, respectively.
Through this setting, when watching the projection picture, the user can experience the stereophonic effect, has further improved the sight shadow experience.
Optionally, in order to ensure that the acoustic wave signal can be reflected to the projection area, the housing portion of the first ultrasonic transducer unit is provided with a movable component, so that when the lens component projects the image signal, an included angle between a plane perpendicular to the central axis of the lens component and a plane in which the first ultrasonic transducer unit is located is an acute angle, or the housing portion of the first ultrasonic transducer unit is provided with a fixed inclined plane, and an included angle between a plane perpendicular to the central axis of the lens component and a plane in which the first ultrasonic transducer unit is located is an acute angle.
The arrangement mode and the arrangement shape of the first ultrasonic transducer units arranged at the two sides of the lens assembly 101 can be flexibly set according to the whole space of the projection device. The arrangement manner of the plurality of first ultrasonic transducer units in at least one column of first ultrasonic transducer units is vertical arrangement or zigzag arrangement, and the specific arrangement direction is similar to that shown in fig. 4 and 5, and is not repeated here. In order to facilitate control of the output signals of the first ultrasonic transducer units 102, the acoustic wave signals received by the same column of first ultrasonic transducer units have the same phase.
Based on the same inventive concept, another embodiment of the present disclosure further provides a projection method applied to the projection apparatus described above, including:
at least one array of first ultrasonic transducer units arranged on the projection device is controlled, and when the lens assembly projects image signals, sound wave signals are emitted towards the projection screen to be reflected to a projection area.
In this embodiment, through controlling first ultrasonic transducer unit and consequently reflecting to the projection region towards projection screen outgoing sound wave signal for the viewer feels the sound that comes out from the image of projection screen, has realized that sound and picture are synchronous, brings more natural immersive experience, and simple structure, and portability is good, has extensive application prospect.
A specific projection method thereof will be described below with reference to fig. 11 by taking the projection apparatus shown in fig. 1 and 2 as an example.
Referring to fig. 11, the controller controls the lens assembly 101 to emit an image signal and controls the first ultrasonic transducer unit 102 to emit an acoustic wave signal. The controller can be a DSP, a singlechip, an FPGA and other processors.
Specifically, the controller acquires a video signal from the storage unit, sends the video signal to the projection image processing module to perform image processing, such as noise reduction, filtering and the like, sends the processed signal to the lens assembly 101, and sends out an image signal to the projection screen via each optical device of the lens assembly to form an image on the projection screen.
On the other hand, the controller acquires an audio signal from the storage unit, sends the audio signal to an analog-to-digital converter (ADC), a modulation circuit, a power amplifier circuit and the like for signal modulation and amplification, sends the audio signal to the filtering unit for filtering processing, sends the processed sound wave signal to the first ultrasonic transducer unit 102, and controls the first ultrasonic transducer unit 102 to emit the sound wave signal towards the projection screen, so that the sound wave signal is reflected to the projection area. The high directivity of the sound wave signal is improved by adding the modulation circuit and the power amplifier circuit, so that directional sound production is realized.
Considering that the propagation speed of sound is smaller than that of light, but the propagation paths of the two are almost identical, if an image signal and an outgoing sound wave signal corresponding to the image signal are simultaneously outgoing from the lens assembly 101 and the ultrasonic transducer unit 102 towards the projection screen, the time when the image signal arrives at the projection area will have a time difference, and the dislocation of the sound and the picture occurs, so that the user viewing experience is affected.
Optionally, the projection method further comprises: and simultaneously emitting the picture signal and the sound wave signal, and adjusting the emission delay time of the sound wave signal relative to the picture signal according to a preset time delay in response to a first operation of a user.
Specifically, referring to fig. 11, based on a key of a user on a remote controller, a picture signal and an acoustic wave signal are emitted simultaneously, and based on a first operation of the user on the remote controller, the first operation may be pressing a "delay" key to emit an adjustment instruction to an infrared receiver, so that the controller adjusts an emission delay time of the acoustic wave signal with respect to the picture signal according to a predetermined delay until the user feels that there is no misalignment of the two. Each key may represent a time delay of one unit, and the number of keys determines the delay adjustment length.
Through the setting, consistency of image signals and sound wave signals can be ensured, and film watching experience of a user is ensured.
Further optionally, the embodiment of the disclosure makes it possible to intelligently adjust the coverage range of sound by using the high directivity characteristic of sound emission of the ultrasonic transducer unit, realize switching between a single-person mode and a multi-person mode, improve privacy of viewing, and ensure that projected sound does not disturb people irrelevant around a projection area.
The method comprises the following steps: the method comprises the steps of obtaining a film watching mode, wherein the film watching mode is a single-person mode or a multi-person mode, and the obtaining mode can comprise the steps of operating a remote controller by a user to select; when the film watching mode is a single person mode, the sound wave signals are controlled to enable the phases of the sound wave signals received by the projection area to be the same, and when the film watching mode is a multi-person mode, the projection area is set to be a plurality of listening areas, and the waveforms of the sound wave signals are controlled to enable the phases of the sound wave signals received by the listening areas to be the same.
The adjustment methods of the single person mode and the multiple person mode are described in detail below.
The center of the ultrasonic transducer unit, the center of the projection area and the center of the projection screen surface are in the same vertical plane. Referring to fig. 1, the shortest path taken by an acoustic wave from projection device 10 to the projection area is:
wherein L is 1 Light emitting surface and projection of lens assembly 101 are shownHorizontal distance between the shadow screens 20, L 2 Representing the horizontal distance between the projection area and the projection screen 20, and H represents the height difference between the projection device 10 and the projection area, which may be, for example, the position of the head of the user as a viewer.
Assuming that the distance between adjacent columns is a, the ultrasonic transducer units located on the central axes of the ultrasonic transducer units with multiple columns are used as the origin, and the distance between the ultrasonic transducer unit in any column and the projection area is expressed as:
in the single person mode, the corresponding time for the sound wave emitted by each array of ultrasonic transducers to reach the projection area is as follows:
T i ＝A i /c (3)
where c represents the propagation velocity of the acoustic wave signal in air and i represents the number of columns from the central axis of the multi-column ultrasound transducer unit.
Then, the acoustic wave signal emitted by the ith column of ultrasonic transducer units is x i T is the position i The waveform at the time is expressed as:
wherein m is i The amplitude of the acoustic wave signal is represented, k represents the wave number, and the angular frequency of the acoustic wave signal is represented.
In order to focus the sound wave in the projection area, the phase and amplitude need to be changed, i.e. according to different A i To adjust the phase phi i The method ensures that sound waves emitted by different arrays of transducer arrays reach a projection area to generate interference enhanced sound wave signals, and the charge conditions for generating the interference enhanced sound wave signals are as follows: the acoustic wave signals are in the same phase in this region.
That is, by controlling the acoustic wave signals emitted from each column of the ultrasonic transducer units, projection is achievedThe phase of the acoustic wave signals in the area is the same, the acoustic wave signals are enhanced and interfered in the area, and the acoustic wave signals finally heard in the projection area are the sum of the acoustic wave signals sent by all the emission sources, namely Sigma f i (A i T). So that a better sound effect can be heard in this area. Other areas, because the directivity of the ultrasound transducer unit is about 30 ° (-3 dB) and the amplitude is smaller closer to the edge, in embodiments of the present disclosure, the size of the projection area that forms the effective listening effect is approximately equal to the width of the array itself of the multi-column ultrasound transducer unit when in single person mode.
In the multi-person mode, in order to be able to cover a larger area with acoustic signals. The target projection area is divided into a plurality of listening areas, each listening area is equivalent to a single-person mode projection point, the distance b between adjacent projection points is not excessively large, and b is smaller than or equal to 40cm. Referring to fig. 12, each listening area corresponds to a plurality of columns of ultrasonic transducer units, and the waveform of the acoustic wave signal emitted from each ultrasonic transducer unit is still as shown in expression (4). Because of the high directivity of the ultrasonic transducer unit, in order to enable the acoustic wave signals to be heard in a wider area, the waveforms of the acoustic wave signals are controlled so that the phases of the acoustic wave signals received by the hearing areas are the same, and therefore the acoustic wave signals in the corresponding areas have interference reinforcing effects in the corresponding areas. Taking four proxels as an example in fig. 12, the acoustic signal can cover a projection area of 3.5×b.
Through the arrangement, the interference strengthening principle between the high directivity characteristic of the ultrasonic transducer unit and the sound wave signal is utilized, and the single-person mode and the multi-person mode are realized for adjusting and controlling, so that the advantages of high privacy and no disturbance to others can be achieved in the single-person mode, the multi-person image watching experience can be met, and the application flexibility of projection is improved.
Corresponding to the projection device, based on the same inventive concept, embodiments of the present disclosure further improve a projection system, comprising:
a projection device according to the above;
the projection curtain is used for projecting light rays emitted by the projection equipment and reflecting sound wave signals emitted by the projection equipment.
The structure and function of the above embodiments have been described in detail in describing the structure and function of the projection apparatus, and will not be described in detail here. By providing a projection system with the above projection device, sound and picture synchronization can be achieved, and a multi-mode projection experience with high privacy and sharing can be achieved.
Aiming at the existing problems at present, the projection equipment, the system and the projection method are formulated, at least one row of first ultrasonic transducer units are provided in the projection equipment, and when an image is transmitted by a lens assembly, sound wave signals are emitted towards a projection screen by the first ultrasonic transducer units and reflected to a projection area, so that a viewer feels sound emitted by the image from the projection screen, sound and picture synchronization is realized, and more natural immersive experience is brought; in addition, the characteristic that sound has directivity can be utilized, transmitted sound is limited to a required area, the privacy of the sound is improved, and the portable sound box is simple in structure, good in portability and wide in application prospect.
It should be apparent that the foregoing examples of the present disclosure are merely illustrative of the present disclosure and not limiting of the embodiments of the present disclosure, and that various other changes and modifications may be made by one of ordinary skill in the art based on the foregoing description, and it is not intended to be exhaustive of all embodiments, and all obvious changes and modifications that come within the scope of the present disclosure are intended to be embraced by the technical solution of the present disclosure.
Claims (12)
1. A projection device, comprising: a controller, a lens assembly and at least one first ultrasonic transducer unit,
the lens assembly projects an image signal to a projection screen in response to a control command of the controller;
when the lens assembly projects an image signal, the first ultrasonic transducer unit emits an acoustic wave signal toward the projection screen to be reflected to a projection area.
2. The projection apparatus according to claim 1, wherein an angle between a plane perpendicular to a central axis of the lens assembly and a plane in which the first ultrasonic transducer unit is located is an acute angle when the lens assembly projects an image signal.
3. The projection device of claim 2, wherein the first ultrasound transducer unit is disposed on a housing of the projection device,
the shell part provided with the first ultrasonic transducer unit is a fixed inclined plane, the included angle between the plane perpendicular to the central axis of the lens component and the plane in which the first ultrasonic transducer unit is arranged is an acute angle, or
The housing part provided with the first ultrasonic transducer unit is a movable component, so that when the lens component projects an image signal, an included angle between a plane perpendicular to the central axis of the lens component and a plane in which the first ultrasonic transducer unit is positioned is an acute angle.
4. A projection device as claimed in claim 3, wherein the first ultrasound transducer unit is located below the lens assembly.
5. A projection device as claimed in claim 3, characterized in that,
the first ultrasonic transducer units are positioned at two sides of the lens assembly, and the first ultrasonic transducer units at two sides respectively output a left sound wave signal and a right sound wave signal.
6. The projection device of claim 1, further comprising: at least one column of second ultrasound transducer units disposed above the lens assembly to emit sound waves toward a top surface of a projection environment for reflection to the projection area within the projection environment.
7. The projection apparatus of claim 2 wherein the included angle is greater than 0 ° and less than or equal to 30 °.
8. The projection device of claim 1, wherein the plurality of first ultrasonic transducer units in the at least one column of first ultrasonic transducer units are arranged in a vertical arrangement or a zigzag arrangement, and the acoustic signals emitted by the same column of first ultrasonic transducer units are identical.
9. A projection system, comprising:
the projection device of any one of claims 1-8;
the projection curtain is used for projecting light rays emitted by the projection equipment and reflecting sound wave signals emitted by the projection equipment.
10. A projection method applied to the projection device of any one of claims 1 to 7, comprising:
and controlling at least one first ultrasonic transducer unit arranged on the projection device, and emitting sound wave signals towards the projection screen to reflect to a projection area when the lens assembly projects image signals.
11. The projection method of claim 10, further comprising:
obtaining a film watching mode, wherein the film watching mode is a single person mode or a multi-person mode;
when the film watching mode is a single person mode, the sound wave signals are controlled to enable the phases of the sound wave signals received by the projection area to be the same,
when the film watching mode is a multi-person mode, the projection area is set to be a plurality of listening areas, and the waveforms of the sound wave signals are controlled so that the phases of the sound wave signals received by the listening areas are the same.
12. The projection method of claim 1, further comprising:
simultaneously emitting a picture signal and an acoustic wave signal,
and adjusting the emergent delay time of the sound wave signal relative to the picture signal according to a preset time delay in response to a first operation of a user.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202311567127.7A CN117579797A (en) | 2023-11-22 | 2023-11-22 | Projection device and system, and projection method |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202311567127.7A CN117579797A (en) | 2023-11-22 | 2023-11-22 | Projection device and system, and projection method |
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| CN117579797A true CN117579797A (en) | 2024-02-20 |
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| CN202311567127.7A Pending CN117579797A (en) | 2023-11-22 | 2023-11-22 | Projection device and system, and projection method |
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| CN (1) | CN117579797A (en) |
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