Hidden loudspeaker system for liquid crystal display television

Abstract

The invention relates to the technical field of liquid crystal display television acoustic systems, in particular to a hidden loudspeaker system for a liquid crystal display television, the core of the system is a frame integrated BMR force balance sound production unit, and opposite balance mode radiators in the system counteract force through reverse vibration and reduce vibration. A 3D printed honeycomb acoustic metamaterial waveguide network is arranged in a television frame to form a precise resonant cavity array, a frame is of a multi-layer composite material structure and comprises a rigid support, an acoustic metamaterial resonant cavity and a sound transmission aesthetic layer, a distributed micro-driving array is further arranged to provide precise driving, and a self-adaptive acoustic control system comprises a microphone array and a DSP (digital signal processor). And the tone quality is optimized in real time. The technologies jointly achieve efficient and low-vibration broadband sound output, sound quality experience is improved, the frequency response range wider than 38% is provided, the low frequency is enhanced by about 12 dB, and meanwhile the ultra-thin design is kept.

Description

Technical Field

[0001] The present invention relates to the technical field of liquid crystal television acoustic systems, and in particular to a hidden speaker system for liquid crystal televisions, in particular to a "cicada wing-like resonance cavity array" hidden speaker system based on bioacoustic principles. Background Art

[0002] As consumers pursue thinner and more aesthetically pleasing display devices, the thickness of modern LCD TV screens has been reduced to just a few millimeters, significantly limiting the installation space for traditional speaker systems. Currently, LCD TVs on the market primarily utilize bottom-mounted, rear-mounted, or side-mounted speaker layouts, which present significant technical drawbacks: 1. Conflict between aesthetics and functionality: Traditional speakers require a sufficient resonant cavity volume to produce ideal sound effects, especially in the low-frequency range. This directly conflicts with the design concept of ultra-thin TVs. For example, patent document CN1956603A discloses a "thin-film speaker using a piezoelectric film as a vibration component." While this achieves a thinner speaker, its limited vibration area and insufficient resonant cavity volume result in extremely limited low-frequency response, making it difficult to provide satisfactory sound quality.

[0003] 2. Inaccurate sound field positioning: As described in patent US5274709A, "Speaker Device for Television Receiver," traditional rear-mounted or bottom-mounted speakers prevent the sound from being directly associated with the image source, resulting in a fragmented audiovisual experience. While the patent proposes an improvement, it still fails to completely resolve the sound positioning issue.

[0004] 3. Insufficient structural integration: Existing technologies generally use independent speaker units installed within the TV frame, failing to fully utilize the TV structure and resulting in wasted space. As described in patent US7301586B2, "LCD TV and Projection Backlight System Thereof," the traditional separate component design increases assembly complexity and limits acoustic performance.

[0005] Among existing technologies, Sony's Acoustic Surface technology offers an innovative approach by directly vibrating the screen surface to produce sound, but its frequency response range is limited, with particularly poor low-frequency performance. Samsung's Object Tracking Sound technology enhances the sense of space by placing multiple independent speakers around the TV frame, but this requires a large number of independent units, increasing cost and assembly complexity. While digital processing technologies like LG's AISound Pro can provide virtual surround sound effects, they still cannot overcome the inherent limitations of physical sound units.

[0006] The above existing technologies still have significant shortcomings in addressing the sound quality issues of ultra-thin TVs, primarily due to: ① limited low-frequency performance; ② poor sound directionality; ③ inability to effectively integrate the acoustic system with the TV structure; and ④ failure to provide optimized sound field performance for different content types. Therefore, there is an urgent need for an innovative speaker system that maintains an ultra-thin aesthetic design while providing a high-quality audio experience. Summary of the Invention

[0007] The purpose of this invention is to provide a hidden speaker for LCD televisions, resolving the conflict between sound quality and space limitations in ultra-thin televisions. Specifically, the present invention aims to overcome the shortcomings of the existing technology and achieve the following technical objectives: 1. Provide a wide frequency response range without increasing the thickness of the TV, especially enhancing low-frequency performance; 2. Achieve precise sound positioning and controllable sound field effects; 3. Seamlessly integrate the acoustic system into the TV frame structure, balancing aesthetic design and acoustic performance; 4. Provide adaptive sound field optimization for different content types.

[0008] The present invention discloses a hidden speaker system for a liquid crystal television, comprising: A frame-integrated BMR force-balancing sound unit, comprising multiple balanced mode radiator sound units mounted opposite each other within the TV frame, with the units vibrating in opposite directions to achieve force cancellation; A honeycomb acoustic metamaterial waveguide network, formed by 3D printing inside the TV frame, features a network of precisely calculated acoustic channels of varying cross-section and specific lengths, forming an array of resonant cavities similar to an organ; A multi-layer composite frame structure comprising an inner rigid frame support layer, a middle acoustic metamaterial layer, and an outer acoustically transparent aesthetic layer, wherein the middle acoustic metamaterial layer includes a precisely designed resonant cavity and waveguide structure; A distributed micro-drive array system comprising a plurality of micro force-balancing actuators distributed along a television frame; and An adaptive acoustic control system includes a built-in micro-microphone array and an intelligent digital signal processor.

[0009] Preferably, the frame-integrated BMR force-balanced sound unit includes 16 to 24 dual-diaphragm force-balanced BMR driver units, and the dual-diaphragm force-balanced BMR driver units are connected to the frame through an elastic suspension system to reduce vibration transmission.

[0010] Preferably, the honeycomb acoustic metamaterial waveguide network is inspired by the cicada wing acoustic structure, and the acoustic channel network has channels of different lengths to form an acoustic multi-frequency resonator system, which particularly enhances low-frequency response.

[0011] Preferably, the inner rigid frame support layer of the multi-layer composite frame structure is made of carbon fiber reinforced material, the middle acoustic metamaterial layer contains a precisely designed acoustic channel and resonance cavity structure, and the outer sound-transmitting aesthetic layer adopts a micro-perforated acoustic transmission design, which maintains the design aesthetics while allowing sound waves to pass through.

[0012] Preferably, the micro force balance actuators in the distributed micro drive array system work together through precise phase control to form a controllable sound wave front, achieve precise sound positioning and a wider sound field, and adjust the sound field pattern according to the content type.

[0013] Preferably, the micro-microphone array of the adaptive acoustic control system continuously monitors the indoor acoustic environment and system performance, and the intelligent digital signal processor adjusts the output of each drive unit according to real-time data to optimize sound performance and prevent resonance problems.

[0014] Preferably, it further includes a thermal management system integrated in the frame structure, which uses the frame material as a heat dissipation path to ensure that the drive unit operates within an ideal temperature range.

[0015] Preferably, the diaphragm of the frame-integrated BMR force-balanced sound unit is made of phase change material to provide a wider frequency response range.

[0016] Preferably, the system further comprises a passive radiator unit placed at a strategic position within the frame, wherein the passive radiator unit works in conjunction with the active drive unit to enhance low-frequency response.

[0017] Preferably, it also includes an electronic frequency divider and a signal routing system and a phase correction waveguide unit. The electronic frequency divider and the signal routing system are optimized according to the input of the adaptive acoustic control system and then distributed to each drive unit. The phase correction waveguide unit is used to optimize the sound wave propagation path and phase relationship. The main beneficial effects of the present invention include: 1. In terms of technical effects, the present invention provides a 38% wider frequency response range and a low-frequency enhancement of approximately 12dB, while maintaining an ultra-thin design; 2. In terms of structural effect, the present invention fully integrates the acoustic system into the TV frame, without adding additional space requirements; 3. In terms of user experience, the present invention provides more precise sound positioning and a wider effective listening area through distributed sound field control; 4. In terms of manufacturing process, the present invention adopts modular design, which simplifies the production process and improves reliability. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 The figure is a schematic diagram of the overall structure of the hidden speaker for LCD TV according to the present invention.

[0019] Figure 2 This is a schematic cross-sectional structure diagram of the frame-integrated BMR force-balanced sound unit of the present invention.

[0020] Figure 3 Schematic diagram of the three-dimensional structure of the honeycomb acoustic metamaterial waveguide network of the present invention.

[0021] Figure 4 Schematic diagram of the hierarchical structure of the multi-layer composite material frame of the present invention.

[0022] Figure 5 Schematic diagram of the layout of the distributed micro-drive array system of the present invention.

[0023] Figure 6 This is a workflow diagram of the adaptive acoustic control system of the present invention.

[0024] Figure 7 Schematic diagram of the sound field distribution at different frequencies of the present invention.

[0025] Figure 8 2 is a frequency response comparison diagram of the present invention and the prior art. DETAILED DESCRIPTION

[0026] The present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments.

[0027] Figure 1 The overall system structure is shown, including the layout and relationship of the frame-integrated BMR force-balanced sound unit 10, the honeycomb acoustic metamaterial waveguide network 20, the multi-layer composite frame structure 30, the distributed micro-drive array system 40, the adaptive acoustic control system 50, and other components 60-90.

[0028] Figure 2 The cross-sectional structure of the frame-integrated BMR force-balanced sound unit is described in detail, showing the opposing installation method of the BMR driver unit 11 and the elastic suspension system 12, as well as the force balance principle.

[0029] Figure 3 The three-dimensional structure of the honeycomb acoustic metamaterial waveguide network 20 is presented, including the arrangement of honeycomb units, the layout of resonant cavities and variable cross-section channels.

[0030] Figure 4The hierarchical structure of the multi-layer composite frame structure 30 is displayed, and the positional relationship between the inner rigid frame support layer 31, the middle acoustic metamaterial layer 32 and the outer sound-transmitting aesthetic layer 33 is clearly distinguished.

[0031] Figure 5 The layout of the distributed micro-drive array system 40 is depicted, showing the distribution of micro force balance actuators 41 around the TV frame, and schematic diagrams of different sound field modes.

[0032] Figure 6 It is a workflow diagram of the adaptive acoustic control system 50, showing how the micro-microphone array 51 and the intelligent digital signal processor 52 work together, as well as the functions of each processing module.

[0033] Figure 7 The sound field distribution at different frequencies is displayed, including the coverage and directional characteristics of the low-frequency, mid-frequency and high-frequency sound fields.

[0034] Figure 8 It is a frequency response comparison chart with the prior art, showing the advantages of the present invention in frequency response compared with traditional down-firing speakers and AcousticSurface technology, especially low-frequency enhancement and frequency range extension.

[0035] like Figure 1 As shown, the present invention provides a hidden speaker for LCD TVs. Its overall design utilizes the "cicada wing-like resonant cavity array" principle. It primarily comprises a frame-integrated BMR force-balanced sound unit 10, a honeycomb acoustic metamaterial waveguide network 20, a multi-layer composite frame structure 30, a distributed micro-drive array system 40, and an adaptive acoustic control system 50. Furthermore, it includes a thermal management system 60, a passive radiator unit 70, an electronic crossover and signal routing system 80, and a phase-corrected waveguide unit 90.

[0036] like Figure 2 As shown, the frame-integrated BMR force-balanced sound unit 10 includes 16 to 24 dual-diaphragm force-balanced BMR (Balanced Mode Radiator) driver units 11. These units are installed in an opposing manner inside the TV frame, with the vibration directions of the units opposite to each other to achieve force cancellation. Each driver unit is connected to the frame through an elastic suspension system 12 to reduce vibration transmission.

[0037] In a preferred embodiment of the present invention, the BMR driver unit 11 utilizes balanced mode radiation technology, combined with a force-balanced dual-diaphragm design, to create an ultra-thin sound-producing unit. While traditional cone-shaped speaker units require a specific back cavity volume to produce good low-frequency response, BMR technology achieves a wider frequency response within a smaller volume by combining the diaphragm's bending and pistonic modes.

[0038] The force-balancing design is one of the core innovations of this invention. By pairing the drive units to vibrate in opposite directions, the resulting mechanical forces cancel each other out, effectively preventing vibration from being transmitted to the TV panel and eliminating potential display jitter. Furthermore, the elastic suspension system 12 utilizes a multi-point elastic support structure to further isolate vibration transmission.

[0039] Preferably, the diaphragm of the BMR driver unit 11 is made of a phase-change material to provide a wider frequency response range. The phase-change material is specifically a graphene-reinforced polymer composite material that exhibits different stiffness characteristics at different frequencies, enabling a single diaphragm to simultaneously and effectively reproduce high- and low-frequency sounds. The preparation method of the material is as follows: First, 0.5-2.5 weight percent of functionalized graphene nanosheets are dispersed in N-methylpyrrolidone (NMP) solvent and ultrasonically treated for 60-90 minutes to form a uniform dispersion. Then, 85-92 weight percent of thermoplastic polyurethane elastomer (TPU) powder is added and mechanically stirred at 65-75°C for 6-8 hours. Next, the mixture is poured into a mold and vacuum dried at 90-110°C for 24 hours to completely remove the solvent. Finally, hot pressing is performed at 100-120°C and a pressure of 5-7MPa for 10-15 minutes, and a diaphragm material with a thickness of 0.1-0.3mm is obtained after cooling.

[0040] The diaphragm material has the following properties: a frequency-dependent Young's modulus of 1.8-2.2 GPa at 100 Hz and 4.0-4.5 GPa at 10 kHz; a loss factor maintained between 0.01-0.03 from 100-10,000 Hz; and an areal density of 0.15-0.25 kg / m². These parameters ensure that the diaphragm is flexible enough at low frequencies to provide sufficient displacement, yet rigid enough at high frequencies to prevent splitting modes.

[0041] like Figure 3 As shown, the honeycomb acoustic metamaterial waveguide network 20, inspired by the acoustic structure of cicada wings, is 3D-printed to form a precisely calculated network of acoustic channels within the TV frame. These channels have variable cross-sections and specific lengths, forming an organ-like resonant cavity array that selectively enhances specific frequencies, particularly low frequencies.

[0042] The honeycomb acoustic metamaterial waveguide network 20 in this invention is an innovative acoustic structure based on bioacoustic biomimetic design principles. Research has found that the microstructure of cicada wings possesses excellent acoustic wave conduction properties, enabling efficient propagation of low-frequency sound waves within confined spaces. This invention mimics this natural structure by designing a three-dimensional network composed of interconnected microchannels.

[0043] Preferably, the waveguide network is prepared by 3D printing technology, and the materials used are composed of 70-75% photosensitive resin matrix, 15-20% hollow ceramic microspheres, and 5-10% multi-walled carbon nanotubes by mass percentage. The preparation process is as follows: first, the multi-walled carbon nanotubes are ultrasonically dispersed in isopropyl alcohol for 30 minutes, then mixed with the photosensitive resin and hollow ceramic microspheres are added, and stirred at 45-55°C for 3-4 hours to form a uniform mixture. Subsequently, DLP (Digital Light Processing) 3D printing technology is used, with the layer thickness set to 25-35μm, the UV light intensity of 18-22mW / cm², and the exposure time for each layer of 2.5-3.5 seconds. After printing is completed, it is cured in a UV post-treatment box for 10-15 minutes, and the temperature is controlled at 60-70°C.

[0044] The network structure was designed using a parametric algorithm. Key structural parameters include: the main channel diameter gradually varies from 0.8-1.2mm at the inlet to 2.5-3.5mm at the outlet; the branch channel diameter is 0.3-0.6mm; the resonant cavity volume ranges from 0.02cm³ to 0.15cm³; and the overall network porosity is 65-75%. These parameters were optimized through acoustic calculations and simulations to ensure multiple resonant gain points in the low-frequency range of 50-300Hz.

[0045] This structure showed significant acoustic enhancement effects in the test, especially in the 80-200Hz range, with a gain of 8-12dB, which is far superior to traditional designs.

[0046] like Figure 4 As shown, the multi-layer composite frame structure 30 comprises three layers: an inner rigid frame support layer 31, a middle acoustic metamaterial layer 32, and an outer acoustically transparent aesthetic layer 33. Inner layer 31 is made of carbon fiber reinforced material, providing structural support; middle layer 32 contains a precisely designed resonant cavity and waveguide structure; and outer layer 33 utilizes a micro-perforated acoustically transparent design, maintaining aesthetic appeal while allowing sound waves to pass through.

[0047] In one embodiment of the present invention, the inner rigid frame support layer 31 is constructed from a composite of T700-grade carbon fiber and epoxy resin, with a fiber volume fraction of 58-63%. The laminated structure adopts a symmetrical [0° / ±45° / 90°] arrangement and a thickness of 1.2-1.8 mm. This structure provides high strength and rigidity, with a flexural modulus of 120-140 GPa, while remaining lightweight, with a density of only 1.5-1.6 g / cm³.

[0048] The middle layer of acoustic metamaterial 32 is another core innovation of the present invention. It not only serves as a sound wave conduction channel, but also can achieve sound wave modulation through a special structure. This layer is manufactured using a 3D printing process. The material is an acoustically optimized thermoplastic polyurethane (TPU)-based composite material, to which 15-20% hollow glass microspheres and 3-5% multi-walled carbon nanotubes are added to provide specific acoustic impedance characteristics. The microstructure of the middle layer is designed by a computer-aided acoustic optimization algorithm and includes a variable-section waveguide channel and a Helmholtz resonator array to optimize the frequency response characteristics.

[0049] The outer acoustically transparent aesthetic layer 33 utilizes a unique micro-perforated panel design with a pore size of 0.5-0.8mm, an open porosity of 8-12%, and a thickness of 0.6-0.9mm. Made of modified polycarbonate, this design allows for efficient sound wave transmission while visually presenting a continuous, smooth surface, meeting the aesthetic requirements of television design. The optimized distribution pattern of the micro-perforations achieves acoustic transparency while avoiding a visible, regular pattern, resulting in a more refined appearance.

[0050] The three layers are held together by special elastic connectors, preventing acoustic short-circuits and vibration transmission that could occur with rigid connections. The connectors utilize a silicone rubber-based elastomer with a Shore hardness of 35-45A, effectively isolating vibrations between the layers and improving acoustic performance.

[0051] like Figure 5 As shown, the distributed micro-actuator array system 40 comprises multiple miniature force-balanced actuators 41 distributed along the TV's bezel. These actuators work together through precise phase control to form a controllable sound wavefront, enabling precise sound positioning and a wider soundstage. The system can adjust the soundstage mode based on the content type, for example, using dialogue mode to emphasize the center channel and movie mode to expand the width of the soundstage.

[0052] In a preferred embodiment of the present invention, the distributed micro-drive array system 40 utilizes 16 to 24 micro-force-balanced actuator units, evenly distributed within the television's bezel in groups of 3 to 5. Each actuator unit has an effective diaphragm diameter of 15 to 25 mm, a rated power of 2 to 3 W, and a frequency response range of 100 Hz to 20 kHz (±3 dB).

[0053] The coordinated control of the drivers is based on acoustic beamforming technology. By precisely controlling the amplitude and phase of each driver unit, directional sound waves are formed and concentrated in a specific area, improving the sense of sound positioning and clarity. The core algorithm of this technology can be expressed as: , in: is the direction angle The sound pressure at For the The amplitude of each drive unit; is the angular frequency; For time; is the wave number; For the The distance from the drive unit to the target point; To be applied to Phase compensation of each drive unit; is the total number of drive units.

[0054] By optimizing each drive unit and For example, in dialogue playback mode, the system optimizes the phase relationships of the center drivers, creating enhanced interference of sound waves in the center of the screen and improving vocal clarity. In movie mode, more side and top drivers are activated, creating a wider sound field through complex phase relationships and enhancing the sense of surround sound.

[0055] Furthermore, the system dynamically adjusts the beam focus to suit different listening positions, ensuring an optimal listening experience in every room. Experimental data shows that the system provides a uniform frequency response within a ±40° horizontal angle, with a sound pressure level variation of no more than ±3dB, far superior to traditional single-point sound source designs.

[0056] like Figure 6 As shown, the adaptive acoustic control system 50 includes a built-in miniature microphone array 51 and an intelligent digital signal processor 52. The microphone array 51 continuously monitors the indoor acoustic environment and system performance, and the intelligent DSP 52 adjusts the output of each drive unit based on real-time data to optimize sound performance and prevent resonance problems.

[0057] In one embodiment of the present invention, the micro-microphone array 51 consists of 6-8 MEMS microphones distributed along the TV frame, with a sensitivity of -42±3dB (V / Pa), a signal-to-noise ratio greater than 65dB, and a frequency response range of 20Hz-20kHz. These microphones collect ambient sound data in real time and perform acoustic environment analysis at 150ms intervals.

[0058] The intelligent digital signal processor 52 is based on a 32-bit floating-point architecture, has a sampling rate of 48kHz, and a processing latency of less than 10ms. Its core functions include real-time room acoustic analysis, adaptive equalization, phase correction, and dynamic range control. The adaptive algorithm implemented by this processor can be expressed as follows: , in: is the frequency response function of the equalizer; is the frequency response function of the room; is the frequency response function of the loudspeaker system; is the target frequency response function. Room frequency response The acoustic data collected by the microphone array is determined by the transfer function after least squares fitting. The target response is obtained through calibration before leaving the factory and stored in the system. Choose from preset templates based on different content types (such as voice, music, movies), or customize based on user preferences.

[0059] To prevent artifacts that may be introduced by over-equalization, the system also uses constraints: , in It is the maximum gain limit, usually set to 12dB; and These are the minimum and maximum frequencies at which the system can operate effectively, which are 60 Hz and 18 kHz in this embodiment.

[0060] The system also implements an adaptive sound field control algorithm that dynamically adjusts the sound field pattern based on the content type and listening environment. For example, when voice content is detected, the system automatically optimizes the clarity of the mid-frequency band (800Hz-3kHz); when movie content is detected, it enhances low frequencies and spatial perception. This intelligent adaptive feature significantly improves the user experience, allowing users to obtain audio performance optimized for different content without manual adjustments.

[0061] like Figure 1 As shown, the present invention further includes a thermal management system 60 integrated into the frame structure. The system utilizes the frame material as a heat dissipation path to ensure that the drive unit operates within an ideal temperature range.

[0062] In one embodiment of the present invention, the thermal management system 60 utilizes a microchannel heat dissipation design combined with heat-conducting materials. Specifically, the frame incorporates three to five micro heat pipes with diameters of 2.5 to 3.5 mm. The working fluid is the environmentally friendly refrigerant R134a, and the capillary structure utilizes sintered copper powder. These heat pipes efficiently conduct heat generated by the driver unit to the outer surface of the frame and dissipate it to the surrounding environment.

[0063] Furthermore, the contact area between the driver and the frame is coated with thermal grease with a thermal conductivity of 8-10W / (m·K), with a thickness of 0.1-0.2mm, to ensure efficient heat transfer. Test results show that even after six hours of operation at full power, the driver temperature rise does not exceed 25°C, far below the maximum operating temperature limit of key components (85°C), effectively ensuring the long-term reliability of the system.

[0064] like Figure 1 As shown, the present invention also includes passive radiator elements 70 placed at strategic locations within the frame. These elements work in conjunction with the active drive elements to enhance the low frequency response.

[0065] In a preferred embodiment of the present invention, the passive radiator unit 70 is elliptical in design, with a major axis of 30-40 mm, a minor axis of 15-20 mm, a mass of 1.8-2.2 g, and an effective operating frequency range of 40-200 Hz. One or two passive radiators are positioned near each active drive unit to enhance low-frequency output through acoustic coupling.

[0066] The passive radiator's resonant frequency is precisely tuned using a mass block, set within the 70-90Hz range, slightly below the active driver's low-cut frequency, thereby extending the system's low-frequency response. Test data shows that the addition of the passive radiator increases the system's sound pressure level by 4-6dB in the 60-120Hz frequency range, effectively improving the inherent low-frequency deficiency of small speaker systems.

[0067] like Figure 1 As shown, the present invention further includes an electronic crossover and signal routing system 80 and a phase correction waveguide unit 90. The electronic crossover and signal routing system 80 optimizes the input of the adaptive acoustic control system 50 and distributes it to each drive unit. The phase correction waveguide unit 90 is used to optimize the sound wave propagation path and phase relationship.

[0068] In one embodiment of the present invention, the electronic crossover is implemented using a digital FIR filter with crossover points set at 250Hz and 2.5kHz, and a filter order of 512, providing a steep crossover characteristic of -24dB / octave and precise phase control. The signal routing system utilizes a matrix distribution architecture, dynamically adjusting the signal distribution ratio between the drive units based on content type and environmental conditions.

[0069] The phase-corrected waveguide unit 90 is an innovative acoustic structure that, through a carefully designed acoustic pathway, adjusts the propagation time of sound waves at different frequencies, achieving time alignment at the listening position and improving sound coherence and clarity. Manufactured using 3D printing, the unit is made from the same materials as the honeycomb acoustic metamaterial waveguide network 20. Its structural features range from 0.5 to 5 mm, optimized for the wavelength and propagation characteristics of sound waves at different frequencies.

[0070] Through the synergy of the electronic crossover and the phase-corrected waveguide unit, the system achieves optimal performance in both time and frequency domains, providing a more natural and clearer sound reproduction effect.

[0071] The present invention achieves the goal of providing high-quality audio within the ultra-thin TV frame through the synergistic effect of the above functional units. Figure 8 As shown, compared to traditional down-firing or rear speakers, this system offers a 38% wider frequency response range (from the traditional 90Hz-18kHz to 60Hz-20kHz, ±3dB) and more precise sound positioning. Compared to the most advanced Sony Acoustic Surface technology, this system maintains the same ultra-thin design while providing stronger low-frequency performance (approximately 12dB improvement in the 60-120Hz range) and a wider effective listening area.

[0072] Furthermore, the modular design concept employed by this invention allows the system to be flexibly configured to suit different TV sizes and models, significantly improving product adaptability and production efficiency. Test data shows that the system achieves an installation compatibility rate of over 95% on 45-65-inch LCD TVs without increasing the overall thickness of the TV.

[0073] In general, the present invention successfully resolves the contradiction between sound quality and space limitations in ultra-thin TVs, and provides an innovative solution for improving home entertainment experience.

[0074] The above description is only a preferred embodiment of the present invention and does not limit the scope of patent protection of the present invention. Any equivalent structure or equivalent process transformation made by using the contents of the description and drawings of the present invention, or directly or indirectly applied in other related technical fields, is also included in the scope of patent protection of the present invention.

Claims

1. A hidden speaker system for a liquid crystal television, characterized in that: include: A frame-integrated BMR force-balancing sound unit, comprising multiple balanced mode radiator sound units mounted opposite each other within the TV frame, with the units vibrating in opposite directions to achieve force cancellation; A honeycomb acoustic metamaterial waveguide network, formed by 3D printing inside the TV frame, features a network of precisely calculated acoustic channels of varying cross-section and specific lengths, forming an array of resonant cavities similar to an organ; A multi-layer composite frame structure comprising an inner rigid frame support layer, a middle acoustic metamaterial layer, and an outer acoustically transparent aesthetic layer, wherein the middle acoustic metamaterial layer includes a precisely designed resonant cavity and waveguide structure; A distributed micro-drive array system comprising a plurality of micro force-balancing actuators distributed along the frame of a television; as well as An adaptive acoustic control system includes a built-in micro-microphone array and an intelligent digital signal processor.

2. A hidden speaker system for LCD TV according to claim 1, characterized in that: The frame-integrated BMR force-balanced sound unit includes 16 to 24 double-diaphragm force-balanced BMR driver units, which are connected to the frame through an elastic suspension system to reduce vibration transmission.

3. The hidden speaker system for LCD TV according to claim 1, characterized in that: The honeycomb acoustic metamaterial waveguide network is inspired by the acoustic structure of cicada wings. The acoustic channel network has channels of different lengths, forming an acoustic multi-frequency resonator system, which particularly enhances low-frequency response.

4. The hidden speaker system for LCD TV according to claim 1, characterized in that: The inner rigid frame support layer of the multi-layer composite frame structure is made of carbon fiber reinforced material, the middle acoustic metamaterial layer contains a precisely designed acoustic channel and resonance cavity structure, and the outer sound-transmitting aesthetic layer adopts a micro-perforated acoustic transmission design, which not only maintains the design aesthetics but also allows sound waves to pass through.

5. The hidden speaker system for LCD TV according to claim 1, characterized in that: The micro force-balancing actuators in the distributed micro-drive array system work together through precise phase control to form a controllable sound wavefront, achieve precise sound positioning and a wider sound field, and adjust the sound field pattern according to the content type.

6. The hidden speaker system for LCD TV according to claim 1, characterized in that: The adaptive acoustic control system's micro-microphone array continuously monitors the indoor acoustic environment and system performance, and the intelligent digital signal processor adjusts the output of each drive unit based on real-time data to optimize sound performance and prevent resonance problems.

7. The hidden speaker system for LCD TV according to claim 1, characterized in that: It also includes a thermal management system integrated into the frame structure, which uses the frame material as a heat dissipation path to ensure that the drive unit operates within an ideal temperature range.

8. The hidden speaker system for LCD TV according to claim 1, characterized in that: The diaphragm of the frame-integrated BMR force-balanced sound unit is made of phase change material, providing a wider frequency response range.

9. The hidden speaker system for LCD TV according to claim 1, characterized in that: It also includes passive radiators strategically placed within the frame that work in conjunction with the active drivers to enhance low-frequency response.

10. The hidden speaker system for LCD TV according to claim 1, characterized in that: It also includes an electronic crossover and signal routing system and a phase correction waveguide unit. The electronic crossover and signal routing system are optimized according to the input of the adaptive acoustic control system and then distributed to each drive unit. The phase correction waveguide unit is used to optimize the sound wave propagation path and phase relationship.

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