LED box body, LED screen and movie hall

Abstract

The utility model is applicable to the technical field of LEDs, and provides an LED box body, an LED screen and a movie hall, the LED box body comprises a box frame, and a plurality of LED modules which are arranged in sequence are fixed in the box frame; a resonance loudspeaker is fixed on the back surface of the box frame; the resonant loudspeaker is used for performing audio vibration according to a received audio signal, and the audio vibration is transmitted to the air on the front side of the LED module through the box frame and the LED module in sequence, so that the air on the front side of the LED module vibrates to generate sound. The LED screen is composed of an LED box body, the LED box body comprises a box frame and an LED module fixed in the box frame, a resonance loudspeaker is fixed to the back face of the box frame and can generate audio vibration according to audio signals, the audio vibration is transmitted to air on the front face of the LED module with the box frame and the LED module as transmission media, the air on the front face of the LED module is driven to vibrate, and sound is generated. And the generated sound is transmitted to the auditorium to be listened by audiences, so that the sound transmission problem of the LED screen is solved.

Description

Technical Field

[0001] The utility model belongs to the technical field of LEDs, and in particular relates to an LED box, an LED screen and a cinema. Background Art

[0002] Movies can present visual effects on the screen through optical technology. As a powerful form of entertainment and culture, movies have a wide audience and unlimited commercial prospects.

[0003] Movie screens include projection screens and self-luminous display screens, such as LED displays, OLED displays, etc. Figure 1 As shown, the projection screen has a sound-permeable hole 1. When a movie is playing, the central sound is emitted from the high-power speaker 2 installed behind the screen and spreads to the auditorium through the sound-permeable hole 1. In this way, the audience can feel that the voices of the characters in the movie are coming from the middle of the screen, which is consistent with the position of the character's image, achieving the most realistic viewing experience.

[0004] However, it is different for LED display screens, which are generally made up of LED cabinets with LED modules inside, forming a soundproof wall. Therefore, if used in a cinema and the speakers are installed behind the LED screen, the sound from the speakers cannot reach the audience seats at all.

[0005] This problem is particularly prominent in movie theaters equipped with large-size LED screens. The sound cannot be emitted from the center of the screen, and the audience will lose the real movie feeling of hearing the characters speaking from the center of the image.

[0006] Therefore, it is necessary to solve the sound transmission problem of LED display screens. Utility Model Content

[0007] The technical problem to be solved by the utility model is how to solve the sound transmission problem of an LED display screen.

[0008] To solve the above technical problems, in a first aspect, the utility model provides an LED box, comprising a box frame, in which a plurality of LED modules arranged in sequence are fixed; a resonance speaker is fixed on the back of the box frame; the resonance speaker is used to perform audio vibration according to a received audio signal, and the audio vibration is transmitted to the air in front of the LED module through the box frame and the LED module in turn, so that the air in front of the LED module vibrates and produces sound.

[0009] Furthermore, the box frame includes a frame beam and at least one spacing beam, the spacing beams partition the box frame into a plurality of accommodating compartments, each of which is fixed with one or more LED modules; the resonant speaker is fixed on the back of one of the spacing beams.

[0010] Furthermore, the spacing beam with the resonance speaker fixed on the back is located in the middle of the box frame; the resonance speaker is detachably fixed to the back of the box frame.

[0011] Furthermore, a video processing unit is fixed to the back of the box frame, and the video processing unit is connected to the LED module and is used to distribute the received video signal to each LED module and control the LED module to display an image.

[0012] Furthermore, an audio power amplifier module and a power supply circuit are fixed to the back of the box frame; the audio power amplifier module is connected to the resonance speaker and is used to amplify the audio signal and provide it to the resonance speaker; the power supply circuit is connected to the audio power amplifier module and is used to supply power to the audio power amplifier module.

[0013] In the second aspect, the utility model also provides an LED screen, comprising a plurality of LED boxes, each of the outer side surfaces of the boxes having a detachable connection portion, and adjacent LED boxes are spliced ​​and fixed via the detachable connection portion; wherein the LED boxes comprise a plurality of resonant boxes, and the resonant boxes are the LED boxes described in the first aspect.

[0014] Furthermore, the resonance box is located in the central area of ​​the LED screen.

[0015] Furthermore, the LED screen includes: an audio processor for providing an analog audio signal; an audio power amplifier circuit, connected to the audio processor and the resonance speakers of each resonance box, for amplifying the power of the analog audio signal, and providing the power-amplified analog audio signal to all the resonance speakers at the same time, driving all the resonance speakers to perform audio vibration.

[0016] Furthermore, the LED screen also includes a digital audio processor for providing a digital audio signal; each of the resonance boxes also includes: a digital audio signal receiving module, connected to the digital audio processor, for receiving the digital audio signal; a digital-to-analog conversion module, connected to the digital audio signal receiving module, for performing digital-to-analog conversion on the digital audio signal to obtain an analog audio signal; an audio power amplifier module, connected to the digital-to-analog conversion module, for amplifying the power of the analog audio signal and providing it to the resonance speaker; and a power supply circuit, connected to the audio power amplifier module, for supplying power to the audio power amplifier module.

[0017] In the third aspect, the utility model also provides a theater, comprising: the LED screen as described in the second aspect, which receives the video drive signal through the video processing unit board of each box and distributes it to the connector of each LED module; an auditorium facing the front of the LED screen, and the front serves as the sound output surface of the LED screen.

[0018] The LED screen provided by the utility model is composed of an LED box body, which includes an LED module fixed in a box frame, wherein a resonance speaker is fixed on the back of the box frame. The resonance speaker can generate audio vibration according to an audio signal. The audio vibration is transmitted to the air in front of the LED module with the box frame and the LED module as transmission media, driving the air in front of the LED module to vibrate and generate sound. The generated sound is then transmitted to the auditorium to be listened to by the audience, thereby solving the sound transmission problem of the LED screen. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 It is a layout structure diagram of a movie theater using a projection screen provided by the prior art;

[0020] Figure 2 This is a front structural diagram of the LED box provided by the first embodiment of the utility model;

[0021] Figure 3A This is a side structural diagram of an LED box provided by the first embodiment of the utility model;

[0022] Figure 3B This is a side structural diagram of another LED box provided by the first embodiment of the utility model;

[0023] Figure 4 This is a back structural diagram of the LED box provided by the first embodiment of the utility model;

[0024] Figure 5 This is a front structural diagram of an LED screen provided by the second embodiment of the utility model;

[0025] Figure 6 This is a structural diagram of an LED screen provided by the second embodiment of the utility model adopting the first in-phase driving mode;

[0026] Fig. 7A This is a structural diagram of an LED screen provided by the second embodiment of the utility model adopting a second in-phase driving mode;

[0027] Figure 7B yes Fig. 7A The module structure diagram of the digital power amplifier;

[0028] Figure 8 It is a layout diagram of a theater provided in the third embodiment of the utility model. DETAILED DESCRIPTION

[0029] In order to make the purpose, technical solution and advantages of the utility model more clear, the utility model is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described here are only used to explain the utility model and are not used to limit the utility model.

[0030] Figure 2 , Figure 3A , respectively show the front structure, side structure and back structure of the LED box provided by the first embodiment of the utility model, refer to Figure 1 As shown in FIG3 , the LED box includes a box frame 21, in which a plurality of LED modules 22 are fixed and arranged in sequence, and each LED module 22 can fill the entire area of ​​the box frame 21 after being spliced, and the LED module 22 includes a PCB board and a plurality of LED packaged lamp beads 221 welded on the PCB board, and the LED packaged lamp beads 221 include an integrated packaged LED light emitting chip and a driver chip, and the driver chip is electrically connected to the LED light emitting chip. Among them, the arrangement of each LED module 22 is generally an array type.

[0031] In this application, the side where the LED package lamp beads 221 are located is defined as the front side of the LED module 22, and the other side opposite to it is defined as the back side of the LED module 22. Accordingly, for the entire LED box, the side where the LED package lamp beads 221 are exposed is defined as the front side of the box frame 21, and the other side opposite to it is defined as the back side of the box frame 21.

[0032] A connector is provided on the back of each LED module 22, and the connector is electrically connected to each LED package lamp bead 221 through a power line and a data line arranged in the PCB board to form a cascade circuit. The specific cascade mode can be a serial connection, where the data lines of each LED package lamp bead 221 are connected in sequence, or a parallel connection, where the data lines of each LED package lamp bead 221 are connected together to the data line. A resonant speaker 23 is also fixed on the back of the box frame 21.

[0033] The resonance speaker 23 is used to perform audio vibration according to the received audio signal. The audio vibration is transmitted to the air in front of the LED module 22 through the box frame 21 and the LED module 22 in sequence, so that the air in front of the LED module 22 vibrates and generates sound.

[0034] Watching movies in a cinema hall gives the audience an immersive experience of big screen vision. When they can concentrate on watching the movie, in addition to the visual sense of involvement, the sound system designed in the theater can bring high volume shock and at the same time, the story dialogue can be heard clearly. One of the important factors is that the sound of the movie characters' dialogue is emitted from the speaker box placed behind the center of the projection screen, and is transmitted to the audience through the cloth projection screen (or the 3D metal screen with a plastic substrate with sound-permeable holes), so that the audience can clearly feel that the protagonist's dialogue sound is emitted from the middle of the screen. In the large range of the big screen, it can be felt that the sound source and the image position are consistent. However, when using LED display technology to improve image quality, the problem that LED cannot be sound-permeable makes the sound source problem of the dialogue prominent. Therefore, the present application adopts a resonant speaker 23 to amplify the sound in the form of audio vibration, and transmits the audio vibration through the box frame 21 and the LED module 22 as a medium, so as to transmit the sound of the movie character's dialogue. Physically, the sound is emitted from the center of the LED screen, which can reproduce the sound source position of the dialogue and completely overlap with the image position of the protagonist's speech, so as to achieve the best movie viewing experience.

[0035] The resonant speaker 23 is essentially similar to a special sound box without a horn or loudspeaker. It is an audio vibration unit. When installed on any large-area plane, it can transmit audio vibrations to the plane, allowing the large plane to vibrate the surrounding air to form sound, so as to achieve the effect of sounding like other speakers. The audio vibrations it produces have wavelength penetration, that is, the resonant speaker 23 can pass the audio vibrations carrying human voice audio energy from 100Hz to 10kHz through the medium surface, and finally make the sound heard on the other side of the medium, effectively solving the problem of sound penetration of the LED screen. In addition, the resonant speaker 23 uses the resonance principle to generate gain, so it has higher sensitivity and responsiveness at specific frequencies, which can enable the audience to feel the emotional expression in the sound more deeply.

[0036] Further reading Figure 3A A video processing unit 24 is also fixed on the back of the box frame 21. The video processing unit 24 is connected to the LED module 22 and is used to distribute the received video signal to the connectors of each LED module 22 to control the LED module 22 to display images. The video signal received by the video processing unit 24 and the audio signal received by the resonance speaker 23 need to be synchronized, so that the image viewed by the audience and the sound heard can also be synchronized.

[0037] Figure 3B Another side structure of an LED box is shown. Figure 3AOn the basis of the box frame 21, an audio power amplifier module 25 and a power circuit 26 are also fixed on the back of the box frame 21. The audio power amplifier module 25 is connected to the resonance speaker 23, and is used to amplify the audio signal and provide it to the resonance speaker 23. The power circuit 26 is connected to the audio power amplifier module 25, and is used to supply power to the audio power amplifier module 25.

[0038] Figure 3A and Figure 3B The difference between these two structures is that Figure 3A Applicable to the case where the audio amplifier module is independent of the LED box. Figure 3A The audio signal received by the middle resonance speaker 23 has been power amplified. Figure 3B The applicable situation is that the audio signal is not amplified by power, and an audio amplifier needs to be set on the LED box.

[0039] The resonance speaker 23, the video processing unit 24, the audio amplifier module 25, and the power supply circuit 26 may be integrated on the same PCB board, or may be respectively arranged on different PCB boards.

[0040] Further reading Figure 4 The box frame 21 includes a frame beam 211 and at least one spacing beam 212. There are four frame beams, namely an upper frame beam, a lower frame beam, a left frame beam, and a right frame beam. The spacing beams 212 can be of two types, including horizontal and vertical types. The spacing beams 212 divide the box frame 21 into a plurality of accommodating grids. Adjacent accommodating grids 17 are spaced from each other by horizontal spacing beams or vertical spacing beams.

[0041] The number of the spacing beams 212 is unlimited, and the distribution rule of each spacing beam 212 can be uniform or uneven. Therefore, the size of the accommodating grid can have a variety of specifications and sizes. One or more LED modules 22 are fixed in each accommodating grid, such as Figure 4 As shown in , some of the storage compartments have four LED modules 22 fixed therein, and some of the storage compartments have two LED modules 22 fixed therein. Of course, it can also be designed into other sizes and specifications according to the actual application situation, and there is no specific limit, but it is generally required that at least one side of the LED module 22 is adjacent to the spacing beam 212 or the frame beam 211, so as to be fixed on the adjacent spacing beam 212 or the frame beam 211. The specific fixing method is also not limited, and it can be screw fixing, snap fixing, slide fixing, etc., and a detachable fixing method is preferred, which is convenient for replacement when a certain LED module 22 is damaged. A limiting portion can also be further provided on the spacing beam 212 or the frame beam 211, and the LED module 22 is limited after installation so that the LED module 22 can be firmly fixed in the storage compartment. Preferably, the limiting portion can be a rotary limiting mechanism.

[0042] As an implementation method, the resonance speaker 23 is fixed on the back of one of the spacing beams 212, and the spacing beam 212 with the resonance speaker 23 fixed on the back is located in the middle of the box frame 21. Figure 4 It should be noted that the "middle position" here does not necessarily require to be the absolute center position of the box frame 21, but is intended to emphasize that it is within a certain range around the center position as much as possible.

[0043] As another implementation, the resonance speaker 23 may also be fixed on the back side of the frame beam 211 .

[0044] The fixing method of the resonance horn 23 is preferably a detachable fixing method, so as to facilitate replacement of the resonance horn 23 when it is damaged.

[0045] Figure 5 The structure of the LED screen provided by the second embodiment of the utility model is shown, including multiple LED boxes, each of which has a detachable connecting part on the outer side, and adjacent LED boxes are spliced ​​and fixed through the detachable connecting part.

[0046] The detachable connection part can be in the form of a snap-fit ​​connection, or an alignment hole is set on the side wall of the LED box, and the alignment holes of the two boxes to be spliced ​​are connected and fixed by screws, wherein the above-mentioned "outer side surface" can be one or more of the upper side surface, lower side surface, left side surface, and right side surface of the LED box, which is convenient for splicing the LED box at the top, bottom, left or right.

[0047] in, Figure 5 The LED box shown includes a plurality of resonance boxes 50 , and the structure of the resonance boxes 50 is the same as the LED box provided in the first embodiment above.

[0048] As an example, the resonance box 50 may be located in the central area of ​​the LED screen, such as Figure 5 As shown, this design allows the audience to feel that the center audio comes from the middle of the screen, which meets the requirement that the movie dialogue should come out from the middle of the screen. When the audience watches the protagonist speaking in the movie, the dialogue sound comes from the middle of the entire image, and the source direction is consistent with the protagonist image, achieving an ideal viewing effect.

[0049] The multiple resonance boxes 50 can produce sound simultaneously, so that the total volume can reach a high power (such as 108db at a distance of 1 meter), meeting the sound effect requirements of a cinema hall.

[0050] When the sound is emitted from the resonant speakers in the multiple resonant LED boxes 50, we require that the sound waves emitted by each resonant speaker and transmitted to the front of the screen are synchronized (or in-phase) to achieve the effect of sound pressure superposition. Otherwise, if the sound waves emitted by each resonant speaker have different phases, or even have an "anti-phase" relationship, the sound waves will cancel each other out in the air, and the sound pressure will be greatly reduced.

[0051] To achieve the effect that the sound waves emitted by each resonant speaker are synchronized, this application provides two implementation methods:

[0052] Method 1: Figure 6 As shown, the LED screen includes: an audio processor 51 and an audio power amplifier circuit 52.

[0053] The audio processor 51 is used to provide an analog audio signal;

[0054] The audio power amplifier circuit 52 is connected to the audio processor 51 and the resonant speakers of each resonant box, and is used to power amplify the analog audio signal, and provide the power-amplified analog audio signal to all the resonant speakers at the same time, driving all the resonant speakers to perform audio vibration.

[0055] In the first method, the same audio power amplifier circuit 52 is used to output and drive all the resonant speakers, which requires the power amplifier device to be relatively large and have sufficient power to drive all the resonant speakers at the same time.

[0056] Method 2: If Fig. 7A , Figure 7B As shown, the LED screen also includes a digital audio processor 53 for providing digital audio signals, and all LED boxes share one digital audio processor 53. Since the digital audio signal has high synchronization and real-time performance during transmission, and the delay time of each audio channel can be adjusted or compensated, each resonant speaker can receive the digital audio signal at the same time and can vibrate synchronously in the same phase.

[0057] There is no limit to the type of digital audio signal. For example, you can choose DANTE digital audio signal. DANTE digital audio signal complies with industrial standards. It is different from traditional audio devices that transmit audio signals through analog cables, which requires a lot of physical connections and wiring. Dante technology uses a standard Ethernet network to convert audio signals into digital data and transmit them in the network. This digital transmission method eliminates the limitations of analog cables and enables the transmission and sharing of audio signals on a global scale. Dante technology provides an advanced solution for the audio industry. Dante has the following advantages:

[0058] 1. Flexibility: Ethernet connection allows easy connection and communication between audio devices without special physical wiring.

[0059] 2. Scalability: Dante networks can be easily expanded to hundreds of audio channels to meet the needs of audio systems of different sizes and complexities.

[0060] 3. High quality: Dante's audio transmission has excellent sound quality and fidelity, and can provide a high-quality audio experience.

[0061] 4. Low latency: Dante's transmission latency is very low, ensuring the real-time and synchronization of audio signals.

[0062] 5. Simplified management: Through Dante Controller software, users can easily manage and configure the entire Dante network for fast audio routing and control.

[0063] Each resonant box 50 also includes a programmable digital amplifier, which uses digital signal control to achieve the effect of in-phase sound waves emitted by each resonant speaker. Figure 7B As shown, the digital power amplifier at least includes: a digital audio signal receiving module 54 , a digital-to-analog conversion module 55 , and an audio power amplifier module 56 .

[0064] A digital audio signal receiving module 54, connected to the digital audio processor, for receiving the DANTE digital audio signal;

[0065] A digital-to-analog conversion module 55, connected to the digital audio signal receiving module, for performing digital-to-analog conversion on the DANTE digital audio signal to obtain an analog audio signal;

[0066] The audio power amplifier module 56 is connected to the digital-to-analog conversion module, and is used to amplify the analog audio signal and provide it to the resonance speaker 23 .

[0067] In addition, the digital power amplifier may further include a power supply 57 for supplying power to the audio power amplifier module 56. The power supply 57 may reuse the power supply circuit 24 in FIG. 3 , or may be independent of the power supply circuit 24.

[0068] The third embodiment of the utility model provides a theater, such as Figure 8 As shown, it includes: an LED screen 81 and an auditorium 82.

[0069] The structure of the LED screen 81 is as described in the second embodiment above, and the video driving signal is received by the video processing unit of each box and distributed to the connectors of each LED module.

[0070] The auditorium 82 may be a one-layer or multi-layer stepped structure, facing the front of the LED screen 81 , which is the sound emitting surface of the LED screen 81 .

[0071] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. An LED box, characterized in that: It comprises a box frame, in which a plurality of LED modules arranged in sequence are fixed; a resonance speaker is fixed on the back of the box frame; The resonant speaker is used to perform audio vibration according to the received audio signal, and the audio vibration is transmitted to the air in front of the LED module through the box frame and the LED module in sequence, so that the air in front of the LED module vibrates and generates sound.

2. The LED box according to claim 1, characterized in that: The box frame includes a frame beam and at least one spacing beam, wherein the spacing beam partitions the box frame into a plurality of accommodating cells, and one or more LED modules are fixed in each accommodating cell; The resonant horn is fixed on the back side of one of the spacer beams.

3. The LED box according to claim 2, characterized in that: The spacing beam with the resonance speaker fixed on the back is located in the middle of the box frame; The resonance horn is detachably fixed to the back side of the box frame.

4. The LED box according to claim 1, characterized in that: A video processing unit is also fixed on the back of the box frame. The video processing unit is connected to the LED module and is used to distribute the received video signal to each LED module and control the LED module to display an image.

5. The LED box according to claim 1, characterized in that: An audio power amplifier module and a power supply circuit are also fixed on the back of the box frame; The audio power amplifier module is connected to the resonance speaker and is used to amplify the power of the audio signal and then provide it to the resonance speaker; The power supply circuit is connected to the audio power amplifier module and is used to supply power to the audio power amplifier module.

6. An LED screen, characterized in that: It comprises a plurality of LED boxes, each of which has a detachable connecting portion on the outer side, and adjacent LED boxes are spliced ​​and fixed through the detachable connecting portion; Wherein, the LED box includes a plurality of resonance boxes, and the resonance box is the LED box according to any one of claims 1 to 4.

7. The LED screen according to claim 6, characterized in that: The resonance box is located in the central area of ​​the LED screen.

8. The LED screen according to claim 6 or 7, characterized in that: The LED screen includes: An audio processor for providing an analog audio signal; The audio power amplifier circuit is connected to the audio processor and the resonant speakers of each resonant box, and is used to power amplify the analog audio signal and provide the power-amplified analog audio signal to all the resonant speakers at the same time, so as to drive all the resonant speakers to perform audio vibration.

9. The LED screen according to claim 6 or 7, characterized in that: The LED screen also includes a digital audio processor for providing a digital audio signal; Each of the resonant boxes also includes: A digital audio signal receiving module, connected to the digital audio processor, and configured to receive the digital audio signal; A digital-to-analog conversion module, connected to the digital audio signal receiving module, for performing digital-to-analog conversion on the digital audio signal to obtain an analog audio signal; An audio power amplifier module, connected to the digital-to-analog conversion module, for amplifying the power of the analog audio signal and providing it to the resonance speaker; A power supply circuit is connected to the audio power amplifier module and is used to supply power to the audio power amplifier module.

10. A cinema hall, characterized in that: include: The LED screen as claimed in any one of claims 6 to 9 receives the video drive signal through the video processing unit of each box and distributes it to the connectors of each LED module; The auditorium faces the front of the LED screen, and the front serves as the sound emitting surface of the LED screen.

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