Display device

Abstract

The application provides a display device, which comprises a back plate, a back shell covering the back plate, at least one circuit board arranged on the back plate, the circuit board comprising a circuit board body and a plurality of components arranged on the circuit board body, at least part of the components being located on a side of the circuit board body facing the back shell, and a sound-absorbing unit configured to reduce noise generated by vibration of at least part of the components. The sound-absorbing unit has a resonant cavity, one end of the resonant cavity facing the circuit board body has an opening, the opening of the resonant cavity and the components of the circuit board are oppositely arranged, the resonant cavity has a variable volume, and the cross-sectional area of the opening is smaller than that of the resonant cavity. The sound-absorbing frequency of the application can be adjusted according to the change of noise frequency, so as to achieve the purpose of eliminating noise.

Description

Technical Field

[0001] This invention relates to the field of display device technology, and more particularly to a display device. Background Technology

[0002] With the continuous development of science and technology, display devices are being used more and more widely. People frequently come into contact with displays in their lives, work, and entertainment, such as televisions and computers. Therefore, people's requirements for display devices are also getting higher and higher.

[0003] Currently, in display devices, due to assembly misalignments between the capacitors, inductors, relays, and other components on the circuit board near the back cover and the circuit board body, noise is generated when the display device plays sound and images. This is caused by the resonance of the components on the circuit board due to sound waves. Correspondingly, non-woven fabric or sponge cushioning materials are typically installed and adhered between the circuit board body and the components to reduce noise caused by the resonance of the circuit board components.

[0004] However, in the vibration reduction and noise reduction methods of related technologies, due to the corresponding tolerances in the processing dimensions of the circuit board body and the components, the distance between the circuit board body and the components changes, which in turn causes the buffer material to be unable to match the changed distance, ultimately resulting in a weakening of the vibration reduction and noise reduction effect. Summary of the Invention

[0005] The main objective of this invention is to provide a display device that can reduce noise according to changes in noise frequency, thereby eliminating noise.

[0006] To achieve the above objectives, the present invention provides a display device, comprising:

[0007] Back panel;

[0008] Rear shell, rear shell covers the back panel;

[0009] At least one circuit board is disposed on a back panel; the circuit board includes a circuit board body and a plurality of components disposed on the circuit board body, at least some of the components being located on the side of the circuit board body facing the rear housing;

[0010] A noise reduction unit is configured to reduce noise generated by vibration of at least some of the components; the noise reduction unit has a resonant cavity with an opening at one end facing the circuit board body, the opening of the resonant cavity being disposed opposite to the components of the circuit board, the resonant cavity having a variable volume, and the cross-sectional area of ​​the opening being smaller than the cross-sectional area of ​​the resonant cavity.

[0011] The beneficial effects of the present invention are as follows: through the above-mentioned arrangement, that is, by utilizing the principle of Helmholtz resonance, a resonator with a Helmholtz cavity is provided in the noise reduction unit. Since the sound waves passing through the Helmholtz cavity are reflected and out of phase, they cancel out the original sound waves, thereby achieving the effect of noise reduction; secondly, the volume of the Helmholtz cavity can be adjusted according to the change of noise frequency, thereby achieving the purpose of eliminating noise.

[0012] Based on the above technical solution, the present invention can be further improved as follows.

[0013] In some embodiments of this application, the resonant cavity is a Helmholtz cavity.

[0014] In some embodiments of this application, the noise reduction unit includes a resonator; the resonator includes a resonant shell and a base plate; the first end of the resonant shell is open, and the base plate covers the first end of the resonant shell to form a Helmholtz cavity together with the resonant shell; the second end of the resonant shell faces the circuit board and forms an opening of the Helmholtz cavity.

[0015] The base plate is moved relative to the resonant shell to change the volume of the Helmholtz cavity.

[0016] Understandably, the first end of the resonant shell is away from the circuit board, and the second end of the resonant shell faces the circuit board. The base plate at the first end of the resonant shell moves away from or towards the circuit board to change the volume of the Helmholtz cavity.

[0017] In some embodiments of this application, the direction of movement of the base plate relative to the resonant shell is along the line connecting the first end and the second end of the resonant shell.

[0018] It should be noted that this design of the movement direction allows for better modification of the Helmholtz chamber volume while ensuring that other parameters remain unchanged.

[0019] In some embodiments of this application, the noise reduction unit further includes a threaded moving mechanism; the threaded moving mechanism includes a screw connected to the resonant shell and a screw sleeve connected to the base plate, the screw sleeve and the screw engaging with each other to drive the base plate to move relative to the resonant shell.

[0020] It should be noted that this design allows the base plate to move relative to the resonant shell, thereby changing the volume of the Helmholtz cavity.

[0021] In some embodiments of this application, the resonator has at least two Helmholtz cavities, which are arranged side by side along a direction parallel to the surface of the circuit board, and the openings of each Helmholtz cavity are opposite to the circuit board.

[0022] It should be noted that the design of multiple Helmholtz cavities can better reduce noise caused by the resonance of components on the power board and the mainboard, resulting in good noise reduction effect.

[0023] In some embodiments of this application, the inner cavity of the resonant shell has at least two spaced baffles that divide the inner cavity of the resonant shell into at least two cavities, and the bottom plate surrounds the at least two cavities to form a Helmholtz cavity.

[0024] It should be noted that the baffle design facilitates the division of the resonant shell's inner cavity into multiple Helmholtz chambers.

[0025] In some embodiments of this application, at least one circuit board includes a power board and a mechanism board, which are respectively disposed opposite to the openings of each cavity of the silencing unit.

[0026] In some embodiments of this application, the Helmholtz cavity is filled with sound-absorbing cotton.

[0027] Understandably, sound-absorbing cotton can be filled into the Helmholtz chamber to further improve the sound absorption effect.

[0028] In some embodiments of this application, the width of the baffle is equal to the width of the resonant shell.

[0029] The display device provided by the present invention includes a back panel; a rear shell covering the back panel; at least one circuit board disposed on the back panel; the circuit board includes a circuit board body and a plurality of components disposed on the circuit board body, at least some of the components being located on the side of the circuit board body facing the rear shell; a noise reduction unit configured to reduce noise generated by vibration of at least some of the components; the noise reduction unit having a resonant cavity, the end of the resonant cavity facing the circuit board body having an opening, the opening of the resonant cavity being disposed opposite to the components of the circuit board, the resonant cavity having a variable volume, and the cross-sectional area of ​​the opening being smaller than the cross-sectional area of ​​the resonant cavity.

[0030] With the above setup, that is, by using the principle of Helmholtz resonance, a resonator with a Helmholtz cavity is set in the noise reduction unit. Since the sound waves passing through the Helmholtz cavity are reflected and out of phase, they cancel out the original sound waves, thereby achieving the effect of noise reduction. Secondly, the volume of the Helmholtz cavity can be adjusted according to the change of noise frequency, thereby achieving the purpose of eliminating noise. Attached Figure Description

[0031] To more clearly illustrate the technical solutions in the embodiments of the present invention or related technologies, the drawings used in the description of the embodiments or related technologies will be briefly introduced below. Obviously, the drawings described below are some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0032] Figure 1 This is a partial structural schematic diagram of the display device provided in the embodiments of this application;

[0033] Figure 2 An assembly diagram of a circuit board and a noise reduction unit in a display device provided in an embodiment of this application;

[0034] Figure 3 Another assembly diagram of the circuit board and the noise reduction unit in the display device provided in the embodiments of this application;

[0035] Figure 4 A schematic diagram of the principle of the noise reduction unit in the display device provided in the embodiments of this application from a first-view perspective;

[0036] Figure 5 A schematic diagram of the second perspective of the noise reduction unit in the display device provided in the embodiments of this application;

[0037] Figure 6 A front view of the noise reduction unit in the display device provided in the embodiments of this application;

[0038] Figure 7 This is a schematic cross-sectional view of the noise reduction unit in the display device provided in the embodiments of this application;

[0039] Figure 8 A schematic diagram of the structure of a noise reduction unit in a display device provided in an embodiment of this application when the base plate is in the first position;

[0040] Figure 9 A schematic diagram of the structure of a noise reduction unit in a display device provided in an embodiment of this application when the base plate is in the second position;

[0041] Figure 10 This is a schematic diagram of another noise reduction unit in a display device provided in an embodiment of this application;

[0042] Figure 11 This is a schematic diagram of the structure of the third type of noise reduction unit in the display device provided in the embodiments of this application.

[0043] Explanation of reference numerals in the attached figures:

[0044] 100 - Display device; 110 - Back cover; 121 - Circuit board; 1201 - Circuit board body; 1202 - Components; 121a - Power board; 121b - Mechanism board; 130 - Noise reduction unit; 131 - Resonator; 1311 - Resonance shell; 1312 - Base plate; 132 - Threaded moving mechanism; 1321 - Screw sleeve; 1322 - Screw; 133 - Baffle; 140 - Connecting unit; 141 - Connector; 150 - Back plate; 160 - Noise reduction cotton; 170 - Moving structure; 171 - Moving track; 172 - Slider. Detailed Implementation

[0045] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of the present invention. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without creative effort are within the scope of protection of the present invention. In the absence of conflict, the following embodiments and features can be combined with each other.

[0046] In this invention, unless otherwise explicitly specified and limited, the terms "installation," "connection," "linking," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components, unless otherwise explicitly limited. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0047] In this invention, unless otherwise explicitly specified and limited, "above" or "below" the second feature can mean that the first feature is in direct contact with the second feature, or that the first feature is in indirect contact with the second feature through an intermediate medium. Furthermore, "above," "over," and "on top" of the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply that the first feature is at a lower horizontal level than the second feature.

[0048] In the description of this specification, the references to terms such as "one embodiment," "some embodiments," "example," "specific example," or "some examples," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of the present invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples. Moreover, without contradiction, those skilled in the art can combine and integrate the different embodiments or examples described in this specification, as well as the features of different embodiments or examples.

[0049] Flat panel displays, televisions, and other display devices can be used to display images. Taking a liquid crystal display (LCD) device as an example, an LCD device mainly consists of a backlight module, a liquid crystal panel, and a driving circuit. The liquid crystal panel, as the display panel, does not emit light itself; it relies on the light source provided by the optical elements in the backlight module to achieve brightness display. The display principle of an LCD is to place liquid crystal between two conductive glass plates. Driven by the electric field between two electrodes, the liquid crystal molecules undergo a twisting nematic electric field effect, which controls the transmission or blocking function of the backlight, thereby displaying the image. Adding a color filter allows for the display of color images.

[0050] In related technologies, display devices have circuit boards mounted on a back panel. The circuit board includes a circuit board body and components. The components are mounted on the circuit board body and face the rear housing. Due to assembly misalignments between the capacitors, inductors, relays, and other components on the circuit board near the rear housing and the circuit board body, these components vibrate under resonance when the display device plays sound and images, generating noise. To reduce and eliminate noise, a common practice in related technologies is to install and adhere non-woven fabric or sponge as a cushioning material between the circuit board body and the components. However, in these vibration reduction methods, the dimensional tolerances of the circuit board body and components themselves cause variations in the distance between them. This results in the cushioning material being unable to match the changed distance, ultimately weakening the vibration reduction effect.

[0051] To overcome the shortcomings of related technologies, the display device provided by the present invention utilizes the principle of Helmholtz resonance. By setting a resonator with a Helmholtz cavity in the noise reduction unit, the sound waves passing through the Helmholtz cavity are reflected and out of phase, thus canceling out the original sound waves and achieving the effect of noise reduction. Secondly, the volume of the Helmholtz cavity can be adjusted according to the change of noise frequency, thereby achieving the purpose of eliminating noise.

[0052] The present invention will now be described in detail with reference to the accompanying drawings, so that those skilled in the art can have a clearer and more detailed understanding of the present invention.

[0053] Figure 1 This is a partial structural schematic diagram of the display device provided in an embodiment of this application. Figure 2 This is an assembly diagram of a circuit board and a noise reduction unit in a display device provided in an embodiment of this application. Figure 3 This is another assembly diagram of the circuit board and the noise reduction unit in the display device provided in the embodiments of this application. Figure 4 This is a schematic diagram of the first-view principle of the noise reduction unit in the display device provided in the embodiments of this application. Figure 5 This is a schematic diagram illustrating the principle of the noise reduction unit in the display device provided in the embodiments of this application from a second perspective. Figure 6 This is a front view of the noise reduction unit in the display device provided in the embodiment of this application.

[0054] <Composition of display device 100>

[0055] like Figures 1 to 6 As shown, this application embodiment provides a display device 100, which can be a liquid crystal display device.

[0056] In some embodiments, the display device 100 includes a housing covering the display device 100 to cover internal components and protect the display device 100.

[0057] The shell includes a front shell and a rear shell 110, with the rear shell 110 located on the back side of the front shell.

[0058] In some embodiments, the display device 100 further includes a display panel for displaying images, which is mounted on the front housing.

[0059] In some embodiments, the display device 100 further includes a backlight module disposed on the side away from the display surface of the display panel and configured to provide backlight beads to the display panel. The backlight module includes an optical film group and a lamp plate. The optical film group is located between the display panel and the lamp plate, and the lamp plate is located on the light-incident side of the display panel and can provide the display panel with the light required for display.

[0060] In some embodiments, the display device 100 further includes a plurality of circuit boards 121, each circuit board 121 including a circuit board body 1201 and a plurality of components 1202 disposed on the circuit board body 1201, such as capacitors, inductors, relays, etc.

[0061] In some embodiments, the display device 100 further includes a back plate 150 disposed on the rear side of the lamp plate and supporting the backlight module and circuit board 121, etc.

[0062] In some embodiments, the display device 100 further includes a noise reduction unit 130, which is disposed on the rear housing. The noise reduction unit 130 has a variable-volume Helmholtz cavity with an opening, wherein the opening is disposed opposite to the components 1202 on the circuit board 121. The circuit board 121 is mounted on the back plate 150 and includes a circuit board body 1201 and components 1202. The components 1202 are disposed on the circuit board body 1201 and face the rear housing 110. Because the components 1202 such as capacitors, inductors, and relays on the circuit board near the rear housing are connected to the electrical components 1202, the noise reduction unit 130 has a variable-volume Helmholtz cavity with an opening, which is disposed opposite to the components 1202 on the circuit board body 1201 and faces the rear housing 110. There are assembly deviations between the circuit board bodies 1201. When the display device 100 plays sound and images, the components 1202 on the circuit board 121 will vibrate under the resonance caused by the sound waves and generate noise. The noise reduction unit 130 is equipped with a Helmholtz cavity with variable volume. Since the sound waves passing through the Helmholtz cavity are reflected, they cancel out the original sound waves, thereby achieving the noise reduction effect. Secondly, the Helmholtz cavity can adjust its volume according to the change of noise frequency, so that the frequency of the reflected wave of the Helmholtz cavity matches the frequency of the noise, thereby achieving the purpose of eliminating noise.

[0063] Furthermore, noise reduction can be achieved simply by installing a silencing unit 130, making the entire installation process relatively simple and the operation highly efficient. At the same time, compared to noise reduction methods in related technologies, this application can solve the problem that the components 1202 on the circuit board 121 cannot reduce noise by adding a fixing structure or vibration damping materials due to their own resonance.

[0064] In some embodiments, the display device 100 further includes a connection unit 140, with a first end disposed on the rear housing 110 and a second end connected to the noise reduction unit 130. The connection unit 140 enables the stable installation of the noise reduction unit 130.

[0065] The structure of each part of the display device will be described in turn with reference to the accompanying drawings.

[0066] <Shell>

[0067] The housing includes a rear cover 110, which is located on the side of the backlight module away from the display panel, i.e., the rear cover 110 is positioned behind the backlight module. The controller, electrical connection cables, etc. of the display device 100 can be located between the backlight module and the rear cover 110 to simplify the appearance of the display device 100. The material of the rear cover 110 can be plastic, metal, etc.

[0068] <Display Panel>

[0069] The display device 100 is a liquid crystal display device 100, which includes a display panel for displaying text, images and other image information.

[0070] The display panel includes a touch glass and an LCD screen. The touch glass and the LCD screen are stacked sequentially along the thickness direction of the display device 100.

[0071] It is understandable that the display panel has a top side, a bottom side, a left side, a right side, a front side, and a rear side. The left and right sides of the display panel refer to the user's left and right sides when the user is facing the touch glass and performing a touch operation. Correspondingly, the side of the display panel facing the user is the front side, the side of the display panel away from the user is the rear side, the top side of the display panel is the top side, and the bottom side of the display panel is the bottom side. In this way, the touch glass is placed on the front side of the LCD screen to protect the LCD screen.

[0072] The display panel is the main component of the display device 100, and it mainly includes a liquid crystal display panel, a color filter (CF) substrate, a thin film transistor (TFT) substrate (also called an array substrate), and a liquid crystal (LC) layer, which is located between the color filter substrate and the array substrate. The TFT substrate has data lines and scan lines. By controlling the energization of the data lines and scan lines, the orientation of the liquid crystal molecules is changed, so that light from the light source is emitted through the color filter substrate to generate a preset color image.

[0073] Backlight Module

[0074] Since the liquid crystal display panel itself cannot emit light, in order for the display device 100 to display normally, the display device 100 also includes a backlight module. The backlight module includes a lamp board, which is disposed on the side away from the display surface of the display panel. The lamp board is used to generate light and is configured to provide backlight to the display panel.

[0075] Understandably, the purpose of the backlight panel is to provide sufficient brightness and evenly distributed backlight to the display panel, which can modulate the backlight as needed to display different images.

[0076] In some embodiments, the light panel may include a light panel body and a light source. The light source may be a light-emitting diode (LED), a mini-light-emitting diode (Mini LED), or a micro-light-emitting diode (Micro LED).

[0077] There can be multiple light sources, and these multiple light sources are arranged on the side of the lamp panel body facing the display panel and spaced apart, so that the light sources provide backlight for the display panel.

[0078] The light source can be a light bead or a light strip, and multiple light sources can be fixed to the light panel body by means of snap-fit, threaded connection, etc.

[0079] <Circuit Board 121>

[0080] Circuit board 121 is mounted on back plate 150.

[0081] It should be noted that any circuit board 121 includes a circuit board body 1201 and components 1202, with the components 1202 disposed on the circuit board body 1201. It is understood that the circuit board 121 will be parallel or nearly parallel to the display panel of the display device 100; therefore, one side of the circuit board 121 faces the display panel, while the other side faces the rear cover 110. Due to the internal space limitations of the display device 100, some or all of the components 1202 on the circuit board body 1201 will be located on the side of the circuit board body 1201 facing the rear cover 110.

[0082] At least one circuit board 121 can be of various types, such as a power board 121a and a mechanism board 121b. The power board 121a is mainly used to supply power to the display device 100, while the mechanism board 121b is mainly responsible for the overall control of the display device 100, the conversion of audio and video signals, and the driving of the display panel, etc.

[0083] When the display device 100 plays sound and images, the capacitors, inductors, relays and other components in the circuit board 121 will resonate with the sound waves generated by the speaker, thus generating noise. Therefore, the noise can be reduced by the noise reduction unit 130.

[0084] <Silencer Unit 130>

[0085] The noise reduction unit 130 includes a resonator 131 having a variable volume Helmholtz cavity, the opening of which is disposed opposite to components 1202 on a circuit board 121.

[0086] Specifically, since the noise mainly originates from the resonance of component 1202, the opening of the Helmholtz cavity in the noise reduction unit 130 faces the circuit board 121. For example, the opening can face the power board 121a and the mechanism board 121b.

[0087] The following, with reference to the accompanying diagram, explains the principle of noise reduction using a Helmholtz cavity:

[0088] like Figures 1 to 6As shown, the Helmholtz cavity is formed by the Helmholtz resonator, which is mainly composed of two parts: the bottleneck and the main cavity. Several important dimensional parameters determine its resonant frequency: bottleneck length (L), bottleneck radius (r), and cavity volume (V). Therefore, the Helmholtz resonator can be modeled using a simple spring-proton model.

[0089] Furthermore, it should be noted that a mass block connected to a spring, driven by an external force, will move up and down at a certain frequency under the action of the spring force and its own gravity (ignoring air resistance and friction). Here, we can imagine the air at the bottleneck as an air mass block, while the air inside the cavity acts as a spring. Ultimately, the formula for calculating the resonant frequency can be derived as follows:

[0090]

[0091] Where A is the cross-sectional area of ​​the bottleneck, V is the volume of the cavity, L is the length of the bottleneck, and c is the speed of sound in air. It can be seen that the larger the volume and the smaller the cross-sectional area, the lower the resonant frequency.

[0092] It should be noted that the original shape of a Helmholtz resonator is a container with a narrow neck or small opening. When subjected to sound waves, the air inside the neck vibrates, and the air inside the container exerts a restoring force on it. When the wavelength of the sound wave is much larger than the geometric dimensions of the resonator, the kinetic energy of the air vibration inside the resonator can be considered to be concentrated in the motion of the air inside the neck, and the potential energy is only related to the elastic deformation of the air inside the container. Thus, the Helmholtz resonator is a one-dimensional vibrating system composed of the effective mass of the air inside the neck and the elasticity of the air inside the container, and therefore exhibits resonance with the applied sound waves. The resonant frequency is given by the formula: f0 = f0 / (V * V * V), where f0 is the resonant frequency of the Helmholtz resonator, s is the speed of sound, A is the cross-sectional area of ​​the neck or opening, L is the length of the neck, and V is the volume of the container. Under the action of a sound wave of a certain intensity, the vibration velocity of the air inside the neck is the maximum at this resonant frequency.

[0093] Therefore, by utilizing the principle of Helmholtz resonance, a resonator with a Helmholtz cavity can be set in the noise reduction unit 130. Since the sound waves entering the Helmholtz cavity through the opening are reflected and thus cancel out the original sound waves, a Helmholtz cavity can be set opposite the noise source, and the opening of the Helmholtz cavity faces the noise source. This allows the Helmholtz cavity to emit canceling sound waves that are opposite in direction and at the same frequency as the sound waves of the noise source, thereby canceling out the noise from the noise source and achieving a noise reduction effect.

[0094] Because there are certain assembly and manufacturing tolerances between the capacitors, inductors, relays, and other components in the circuit board 121 and the circuit board body 1201, the distance between the circuit board body 1201 and the components 1202 does not match the original design distance. Therefore, the Helmholtz cavity in the silencing unit 130 can have adjustable parameters to adapt to different actual conditions of the circuit board 121. Specifically, the Helmholtz cavity can have an adjustable volume to match the reverse sound waves generated by the Helmholtz system with the noise sound waves generated by the circuit board 121.

[0095] like Figure 3 and Figure 4 As shown, in some embodiments of this application, the resonator 131 includes a resonant shell 1311 and a base plate 1312. The first end of the resonant shell 1311 is open, and the base plate 1312 covers the first end of the resonant shell 1311 to form a Helmholtz cavity together with the resonant shell 1311. The second end of the resonant shell 1311 faces the circuit board 121 and forms an opening of the Helmholtz cavity.

[0096] The base plate 1312 is movable relative to the resonant shell 1311 to change the volume of the Helmholtz cavity.

[0097] Understandably, the first end of the resonant shell 1311 is away from the circuit board 121, and the second end of the resonant shell 1311 faces the circuit board 121. The base plate 1312 at the first end of the resonant shell 1311 moves in a direction away from or towards the circuit board 121 to change the volume of the Helmholtz cavity.

[0098] As can be seen from the above, the larger the volume of the Helmholtz cavity, the smaller the cross-sectional area and the lower the resonant frequency. This can be understood as follows: when the noise frequency that needs to be adjusted is low, the base plate 1312 can be moved so that the base plate 1312 moves away from the opening to increase the volume of the Helmholtz cavity.

[0099] Accordingly, when the noise frequency that needs to be adjusted is large, the base plate 1312 can be moved so that the base plate 1312 moves toward the direction closer to the opening, so as to reduce the volume of the Helmholtz cavity.

[0100] In summary, by adjusting the position of the base plate 1312 relative to the resonant shell 1311, the volume of the Helmholtz cavity can be adjusted, thereby further matching a more suitable noise that needs to be eliminated.

[0101] To facilitate the movement of the base plate 1312, in some embodiments, the shape of the cross-section of the resonant shell 1311 remains consistent along the direction towards the opening and away from the opening, and the cross-sectional area remains unchanged. In this way, the base plate 1312 can be moved relatively easily in the direction close to and away from the opening, and the structure of the base plate 1312 itself and the connection structure of the base plate 1312 relative to the resonant shell 1311 will not change when the base plate 1312 is moved.

[0102] Figure 7 This is a schematic cross-sectional view of the noise reduction unit in the display device provided in an embodiment of this application. Figure 2 as well as Figure 7 As shown, in some examples, the resonant shell 1311 and the base plate 1312 can be movably connected via a movable structure 170. The movable structure 170 has different parts that can move relative to each other, and these different parts are connected to the resonant shell 1311 or the rear shell 110 respectively, so that the resonant shell 1311 can move relative to the rear shell 110 by the relative movement of the parts inside the movable structure 170.

[0103] In some embodiments, the moving structure 170 may include a moving track 171, wherein the extending direction of the moving structure 170 is consistent with the moving direction of the base plate 1312.

[0104] For example, there are two movable structures 170, which are respectively connected to the outer walls of opposite sides of the resonant shell 1311. The opposite ends of the base plate 1312 are slidably connected to the ends of the two movable structures 170. The base plate 1312 can reciprocate on the movable structure 170 along the direction close to or away from the opening to change the volume of the Helmholtz cavity.

[0105] In some examples, the sidewalls of the movable structure 170 and the resonant shell 1311 can be connected by a detachable connection method, such as by bolts, clips or hanging, to facilitate subsequent maintenance and replacement.

[0106] Alternatively, the sidewalls of the movable structure 170 and the resonant shell 1311 can be connected using other methods. Here, no restrictions are placed on the connection method between the sidewalls of the movable structure 170 and the resonant shell 1311.

[0107] It should be noted that a slider 172 can be installed on the base plate 1312, and the slider 172 matches the moving track 171 to improve the smoothness of the movement of the base plate 1312.

[0108] To ensure that the base plate 1312 maintains a sealed resonant cavity with the resonant shell 1311 during movement, the shape of the base plate 1312 can be adapted to the shape and size of the joint between the resonant shell 1311 and the base plate 1312. This ensures that the end of the resonant cavity facing away from the opening remains sealed, and the movement of the base plate 1312 will not affect the normal vibration reduction and noise reduction of the resonant cavity.

[0109] In some embodiments of this application, the movement direction of the base plate 1312 relative to the resonant shell 1311 is along the line connecting the first end and the second end of the resonant shell 1311. This movement direction design allows for more convenient changes to the volume of the Helmholtz cavity.

[0110] In some examples, the cross-sectional shape of the resonant shell 1311 in the direction perpendicular to the movement of the base plate 1312 can be set to a rectangle. Correspondingly, the base plate 1312 can be a rectangular plate structure. In this embodiment, the shape and outline of both the resonant shell 1311 and the base plate 1312 are set to rectangles as an example.

[0111] Figure 8 This is a schematic diagram of the structure of a noise reduction unit in a display device provided in an embodiment of this application when the base plate is in the first position. Figure 9 This is a schematic diagram of the structure of a noise reduction unit in a display device provided in an embodiment of this application when the base plate is in the second position.

[0112] like Figure 8 , Figure 9 As shown, in some other embodiments of this application, in order to make more precise positional adjustments of the base plate 1312 in the silencing unit 130 relative to the resonant shell 1311, the silencing unit 130 may also include a threaded moving mechanism 132. The threaded moving mechanism 132 includes a screw 1322 connected to the resonant shell 1311 and a threaded sleeve 1321 connected to the base plate 1312. The threaded sleeve 1321 and the screw 1322 are screwed together to drive the base plate 1312 to move relative to the resonant shell 1311. In this way, by loosening or tightening the threaded sleeve 1321 and the screw 1322, the base plate 1312 is driven to move relative to the resonant shell 1311, ultimately changing the volume of the Helmholtz cavity.

[0113] Similar to the aforementioned structure utilizing the moving track 171, this design allows the base plate 1312 to move relative to the resonant shell 1311, thereby changing the volume of the Helmholtz cavity. Compared to the method of moving the base plate 1312 by relative sliding using structures such as the moving track 171, the method of using the threaded moving mechanism 132 can ensure the stability and positional accuracy of the adjustment, guaranteeing that the base plate 1312 is in the correct position.

[0114] It should be noted that the specific locations and methods of setting the screw sleeve 1321 and screw 1322 are not limited in this embodiment of the application, as long as the above objectives are met.

[0115] As can be seen from the foregoing, in some embodiments of this application, reference is made to... Figure 1 and Figure 2 The circuit board 121 includes a power board 121a and a mechanism board 121b, and the noise originates from the resonance of components 1202 in the power board 121a and mechanism board 121b. Therefore, the opening of the Helmholtz cavity in the noise reduction unit 130 needs to face the power board 121a and mechanism board 121b. When the power board 121a and mechanism board 121b are not in the same position, or when the areas of the power board 121a and mechanism board 121b are large, a single Helmholtz cavity may not be able to guarantee vibration damping and noise reduction for all components 1202.

[0116] Therefore, to accommodate situations where the circuit board 121 has a large area or where there are multiple circuit boards, in some embodiments of this application, the resonator 131 has at least two Helmholtz cavities. These at least two Helmholtz cavities are arranged side-by-side along a direction parallel to the surface of the circuit board 121, and the opening of each Helmholtz cavity is opposite to the circuit board 121. Figures 1 to 9 As shown.

[0117] At this point, the resonator 131, formed by multiple Helmholtz cavities arranged side by side, has a length that matches the length of the circuit board 121, and the openings of the multiple Helmholtz cavities all face the circuit board 121. In this way, the resonator 131 will also have multiple openings, each facing a different position on the circuit board 121, or facing a different circuit board, thereby expanding the noise reduction range of the resonator 131.

[0118] In addition, it should be noted that the number of Helmholtz cavities can be adjusted according to actual conditions, and the specific embodiments of this application will not be limited in detail here.

[0119] When the resonator 131 has multiple Helmholtz cavities, the multiple Helmholtz cavities can be arranged in different ways. In some embodiments, at least two Helmholtz cavities are arranged side by side and share the same base plate 1312, so that when the base plate 1312 moves, the volume of all Helmholtz cavities can be changed simultaneously.

[0120] Specifically, such as Figure 8 and Figure 9As shown in some embodiments of this application, the inner cavity of the resonant shell 1311 has at least two baffles 133, which divide the inner cavity of the resonant shell 1311 into at least two chambers, and the bottom plate 1312 surrounds the at least two chambers to form a Helmholtz chamber. When there are multiple baffles 133, the multiple baffles 133 can be spaced apart, for example, they can be arranged at intervals along the length direction of the resonator 131.

[0121] In some embodiments, the baffle 133 is disposed between two adjacent Helmholtz cavity openings and is located within the resonant shell 1311 to divide the inner cavity of the resonant shell 1311 into at least two cavities.

[0122] It should be noted that since the base plate 1312 is movable relative to the resonant shell 1311, the length direction of the baffle 133 matches the moving direction of the base plate 1312. In this way, the baffle 133 extends along the moving direction of the base plate 1312 to avoid affecting the movement of the base plate 1312.

[0123] In some embodiments, one end of the baffle 133 is fixed to the end wall of the resonant shell 1311, and the other end is fixed to the rear shell 110. A plurality of openings are formed on the bottom plate 1312, each opening corresponding to a baffle 133. This means that the plurality of openings are spaced apart on the bottom plate 1312 along the extending direction of the bottom plate 1312, and the plurality of openings correspond to the plurality of baffles 133. The baffles 133 pass through the openings. When the bottom plate 1312 moves relative to the resonant shell 1311, the bottom plate 1312 moves relative to the baffles 133. The openings can be located at different positions of the baffles 133 as the bottom plate 1312 moves.

[0124] It should be noted that, in order to improve the overall strength of the resonator 131, the resonator shell 1311 and the baffle wall 133 can be integrally formed. This not only improves the connection strength between the resonator shell 1311 and the baffle wall 133, but also achieves a seamless connection between them, which can improve the installation efficiency of the vibration connection and reduce the risk of cracking at the connection point between the resonator shell 1311 and the baffle wall 133.

[0125] Figure 10 This is a schematic diagram of another noise reduction unit in the display device provided in the embodiments of this application, as shown below. Figure 10 As shown, as an optional implementation, considering the sealing performance of the Helmholtz cavity, in some other embodiments, one end of the baffle 133 is fixed to the end wall of the resonant shell 1311, and the other end is fixed to the base plate 1312. This means that the baffle 133 can move together with the base plate 1312, thereby changing the volume of the Helmholtz cavity. When the base plate 1312 moves relative to the resonant shell 1311, the baffle 133 also moves relative to the resonant shell 1311 along with the base plate 1312.

[0126] It should be noted that the baffle 133 and the base plate 1312 can be assembled as a single component, thereby improving the ease of assembly of the muffler unit 130 and reducing the space required for the installation of the muffler unit 130.

[0127] In some examples, the baffle 133 can be a plate-shaped piece, and the width of the baffle 133 is consistent with the width of the resonant shell 1311, so that the inner cavity of the resonant shell 1311 can be divided into at least two cavities by the baffle 133. The volume of the at least two cavities can be the same, so that the volume change of each cavity is consistent when the base plate 1312 moves relative to the resonant shell 1311, thereby achieving a better sound absorption effect.

[0128] In addition, it should be noted that the noise elimination process is as follows:

[0129] First, it is necessary to identify the component resonance noise frequencies of the circuit board 121 when the display device 100 is in operation, and determine the noise frequency f that needs to be eliminated.

[0130] according to A is the cross-sectional area of ​​the opening, V is the volume of the cavity, L is the length of the pipe, and c is the speed of sound in the air, where A = d * w.

[0131] When the wavelength of the sound wave is much larger than the geometric dimensions of the cavity, it can be assumed that the kinetic energy of the air vibration within the cavity is concentrated in the motion of the air along the pipe length L, while the potential energy is only related to the elastic deformation of the air inside the container. Thus, the cavity is a one-dimensional vibration system composed of the effective mass of the air in the pipe and the elasticity of the air inside the container.

[0132] When the noise frequency generated by the circuit board 121 (mainly the power board 121a and the mechanism board 121b) is the same as the resonant frequency of the structure, the sound can be reversed through the pipe, thereby canceling out the original sound wave and achieving the purpose of reducing noise and eliminating noise.

[0133] Next, adjustments and adaptations can be made according to the resonance and noise frequencies of the display device 100. When the noise frequency f to be eliminated increases, the base plate 1312 can be moved to the left to reduce the cavity volume V, that is, to reduce the volume of the Helmholtz cavity. When the noise frequency f to be eliminated decreases, the base plate 1312 can be moved to the right to increase the cavity volume V, that is, to increase the volume of the Helmholtz cavity.

[0134] Figure 11 This is a schematic diagram of the structure of the third type of noise reduction unit in the display device provided in the embodiments of this application, as shown below. Figures 1 to 11 As shown in some embodiments of this application, the Helmholtz cavity is filled with sound-absorbing cotton 160.

[0135] Understandably, filling the Helmholtz cavity with 160g of sound-absorbing cotton can further improve the sound absorption effect.

[0136] It should be noted that the noise generated by the capacitors, inductors, relays and other components 1202 in the circuit board during operation first enters the Helmholtz cavity through the opening. Since the sound waves passing through the Helmholtz cavity are reflected and reversed, they cancel out the original sound waves, which can eliminate most of the noise. In addition, a small part of the noise can be eliminated by the sound-absorbing cotton 160.

[0137] In some examples, the sound-absorbing cotton 160 can be placed inside the Helmholtz cavity by filling.

[0138] In other examples, the sound-absorbing cotton 160 can be adhesively attached to the side wall of the resonant shell 1311, ensuring its stability. This arrangement allows the sound-absorbing cotton 160 to remain within the Helmholtz cavity as the base plate 1312 moves relative to the resonant shell 1311, achieving good sound absorption while maintaining high stability.

[0139] For example, when the sound-absorbing cotton 160 is attached to the side wall of the resonant shell 1311, the sound-absorbing cotton 160 can be a thin planar structure, and the length direction of the planar structure formed by the sound-absorbing cotton 160 is consistent with the movement direction of the base plate 1312.

[0140] In some optional examples of the present invention, at least two types of sound-absorbing cotton 160 with different densities are filled to further enhance the noise reduction effect.

[0141] For example, the sound-absorbing cotton 160 can be synthesized from a single type of fiber, such as polyester fiber, glass fiber, etc.; the sound-absorbing cotton 160 can also be formed by processing multiple fibers; the specific material of the sound-absorbing cotton 160 is not limited in the embodiments of the present invention.

[0142] For example, the sound-absorbing cotton 160 can be glass fiber sound-absorbing cotton to better absorb noise entering the Helmholtz cavity.

[0143] With the above-mentioned configuration, namely the configuration of the noise reduction unit 130, the sound waves passing through the Helmholtz cavity are reflected and out of phase, thus canceling out the original sound waves and reducing noise. Therefore, the resonator 131 in the noise reduction unit 130 has a Helmholtz cavity, which uses the principle of Helmholtz resonance to reduce noise. Furthermore, the volume of the Helmholtz cavity can be adjusted according to the change of noise frequency, thereby achieving the purpose of eliminating noise, with good effect.

[0144] <Connecting Unit 140>

[0145] like Figures 1 to 11As shown, in some optional examples of the present invention, the connecting unit 140 includes a connector 141, which is snapped onto the rear cover 110.

[0146] For example, the first end of the connector 141 is detachably disposed on the rear housing 110, and the second end of the connector 141 is connected to the muffler unit 130. The second end of the connector 141 can be connected to the side wall of the resonant housing 1311. In order to increase the installation stability of the resonant housing 1311, the connector 141 is integrally designed with the resonant housing 1311. Both the rear housing 110 and the connector 141 have connection holes. Threaded fasteners pass through the two connection holes in sequence and are tightened, thereby connecting the rear housing 110 and the connector 141 to each other.

[0147] Understandably, the design of connector 141 facilitates the connection of resonant shell 1311 to rear shell 110.

[0148] It should be noted that, considering that the back cover is generally thin, the muffler unit 130 can be set on the back plate 150, wherein the opening of the Helmholtz cavity of the muffler unit 130 and the components 1202 on the circuit board 121 are positioned opposite each other.

[0149] Therefore, in some alternative examples of the present invention, the first end of the connector 141 is detachably disposed on the back plate 150, and the second end of the connector 141 is connected to the muffler unit 130. The second end of the connector 141 can be connected to the side wall of the resonant shell 1311. In order to increase the installation stability of the resonant shell 1311, the connector 141 is integrally designed with the resonant shell 1311. Both the back plate 150 and the connector 141 have connection holes. Threaded fasteners pass through the two connection holes in sequence and are tightened, thereby connecting the back plate 150 and the connector 141 to each other.

[0150] In some other embodiments, the rear cover 110 is provided with a notch, and the connector 141 is snapped into the notch, wherein the shape of the connector 141 and the notch are matched.

[0151] In some embodiments, there are multiple movable structures 170 and multiple connectors 141, with the multiple movable structures 170 and multiple connectors 141 corresponding to each other and located at opposite ends of the silencing shell.

[0152] The display device provided in this application embodiment includes a back panel; a rear shell covering the back panel; at least one circuit board disposed on the back panel; the circuit board includes a circuit board body and a plurality of components disposed on the circuit board body, at least some of the components being located on the side of the circuit board body facing the rear shell; a noise reduction unit configured to reduce noise generated by vibration of at least some of the components; the noise reduction unit has a resonant cavity, the end of the resonant cavity facing the circuit board body having an opening, the opening of the resonant cavity and the components of the circuit board being disposed opposite to each other, the resonant cavity having a variable volume, and the cross-sectional area of ​​the opening being smaller than the cross-sectional area of ​​the resonant cavity.

[0153] With the above setup, that is, by using the principle of Helmholtz resonance, a resonator with a Helmholtz cavity is set in the noise reduction unit. Since the sound waves passing through the Helmholtz cavity are reflected and out of phase, they cancel out the original sound waves, thereby achieving the effect of noise reduction. Secondly, the volume of the Helmholtz cavity can be adjusted according to the change of noise frequency, thereby achieving the purpose of eliminating noise.

[0154] In the description of this invention, it should be understood that the terms "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," and "circumferential" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this invention.

[0155] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this invention, "a plurality of" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0156] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, and not to limit them; although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features; and these modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present invention.

Claims

1. A display device, characterized in that, include: Back panel; Rear housing, the rear housing covering the back plate; At least one circuit board is disposed on the back plate; the circuit board includes a circuit board body and a plurality of components disposed on the circuit board body, at least some of the components being located on the side of the circuit board body facing the rear shell; A noise reduction unit is disposed on the back plate and is configured to reduce noise generated by vibration of at least a portion of the components. The noise reduction unit includes a resonator, which includes a resonant shell and a base plate. The first end of the resonant shell is open, and the base plate covers the first end of the resonant shell to form a Helmholtz cavity together with the resonant shell. The end of the Helmholtz cavity facing the circuit board body has an opening, and the second end of the resonant shell faces the circuit board and forms the opening of the Helmholtz cavity. The opening is arranged opposite to the components of the circuit board, and the cross-sectional area of ​​the opening is smaller than the cross-sectional area of ​​the Helmholtz cavity. The Helmholtz cavity has a variable volume, and the base plate is movable relative to the resonant shell to change the volume of the Helmholtz cavity; The noise reduction unit also includes a threaded moving mechanism, which includes a screw connected to the resonant shell and a screw sleeve connected to the base plate. The screw sleeve and the screw are screwed together to drive the base plate to move relative to the resonant shell.

2. The display device according to claim 1, characterized in that, The direction of movement of the base plate relative to the resonant shell is along the line connecting the first end and the second end of the resonant shell.

3. The display device according to claim 1, characterized in that, The resonator has at least two Helmholtz cavities, which are arranged side by side along a direction parallel to the surface of the circuit board, and the opening of each Helmholtz cavity is opposite to the circuit board.

4. The display device according to claim 1, characterized in that, At least one of the circuit boards includes a power board and a mechanism board, the power board and the mechanism board being respectively disposed opposite to the openings of each of the Helmholtz cavities of the silencing unit.

5. The display device according to claim 1, characterized in that, The resonant shell has at least two spaced baffles in its inner cavity, which divide the inner cavity of the resonant shell into at least two cavities, and the bottom plate surrounds the at least two cavities to form the Helmholtz cavity.

6. The display device according to claim 1, characterized in that, The Helmholtz cavity is equipped with sound-absorbing cotton.

7. The display device according to claim 5, characterized in that, The width of the baffle is equal to the width of the resonant shell.

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