Display device

Abstract

The invention provides a display device. The display device comprises a back plate; the back shell covers the back plate; the circuit board is arranged on the back plate; the circuit board comprises a circuit board body and a plurality of components arranged on the circuit board body, and at least part of the components are located on the side, facing the rear shell, of the circuit board body; the silencing unit is configured to reduce at least part of noise generated by vibration of the components; the silencing unit is provided with a resonant cavity, an opening is formed in the end, facing the circuit board body, of the resonant cavity, the opening of the resonant cavity and a component of the circuit board are oppositely arranged, the resonant cavity has the variable volume, and the cross section area of the opening is smaller than that of the resonant cavity. The sound absorption frequency can be adjusted according to the change of the noise frequency, and the purpose of eliminating the noise is achieved.

Description

Technical Field

[0001] The present invention relates to the technical field of display devices, and in particular to a display device. Background Art

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

[0003] At present, in the display device of the related art, due to the deviation between the assembly of the capacitor, inductor, relay and other components in the circuit board near the rear shell and the circuit board body, when the display device plays sound and pictures, the components on the circuit board will vibrate under the resonance caused by the sound waves and generate noise. Accordingly, generally, a buffer material such as non-woven fabric or sponge is installed and pasted between the circuit board body and the components to reduce the noise caused by the resonance of the circuit board components.

[0004] However, in the vibration reduction and noise reduction method of the related technology, since the processing dimensions of the circuit board body and the components themselves have corresponding tolerances, 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 weakened vibration reduction and noise reduction effect. Summary of the invention

[0005] The main purpose of the present invention is to provide a display device that can reduce noise according to changes in noise frequency to achieve the purpose of eliminating noise.

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

[0007] Back panel;

[0008] A rear shell, which covers the back panel;

[0009] At least one circuit board, which 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 are located on a side of the circuit board body facing the rear shell;

[0010] The silencer unit is configured to reduce the noise generated by the vibration of at least part of the components; the silencer unit has a resonance cavity, the end of the resonance cavity facing the circuit board body has an opening, the opening of the resonance cavity and the components of the circuit board are arranged relative to each other, the resonance cavity has a variable volume, and the cross-sectional area of ​​the opening is smaller than the cross-sectional area of ​​the resonance cavity.

[0011] The beneficial effects of the present invention are as follows: through the above-mentioned arrangement, that is, utilizing the principle of Helmholtz resonance, by arranging a resonator with a Helmholtz cavity in the silencer unit, the sound waves passing through the Helmholtz cavity will be reflected and reversed to offset 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 the noise frequency, thereby achieving the purpose of eliminating the noise.

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

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

[0014] In some embodiments of the present application, the muffler unit includes a resonator; the resonator includes a resonant shell and a bottom plate; the first end of the resonant shell is open, and the bottom plate is covered on the first end of the resonant shell to form a Helmholtz cavity together with the resonant shell, and the second end of the resonant shell faces the circuit board and forms an opening of the Helmholtz cavity;

[0015] The bottom plate is movably arranged relative to the resonance shell to change the volume of the Helmholtz cavity.

[0016] It can be understood that the first end of the resonance shell is away from the circuit board, and the second end of the resonance shell faces the circuit board, wherein the bottom plate at the first end of the resonance shell moves away from or towards the circuit board to change the volume of the Helmholtz cavity.

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

[0018] It should be noted that such a moving direction design can better change the volume of the Helmholtz cavity while ensuring that other parameters will not be changed.

[0019] In some embodiments of the present application, the silencer unit further includes a threaded moving mechanism; the threaded moving mechanism includes a screw connected to the resonance 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 resonance shell.

[0020] It should be noted that such a design can achieve movement of the bottom plate relative to the resonance shell, thereby changing the volume of the Helmholtz cavity.

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

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

[0023] In some embodiments of the present application, the inner cavity of the resonance shell has at least two spaced-apart retaining walls, which separate the inner cavity of the resonance shell into at least two cavities, and the bottom plate surrounds the at least two cavities into Helmholtz cavities.

[0024] It should be noted that the setting of the baffle wall facilitates the partitioning of the inner cavity of the resonance shell into a plurality of Helmholtz cavities.

[0025] In some embodiments of the present application, at least one circuit board includes a power board and a movement board, and the power board and the movement board are respectively arranged opposite to the openings of each cavity of the silencer unit.

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

[0027] It is understandable that the Helmholtz cavity can be filled with sound-absorbing cotton to further improve the sound-absorbing effect.

[0028] In some embodiments of the present application, the width of the blocking wall is equal to the width of the resonance shell.

[0029] The display device provided by the present invention includes a back panel; a rear shell, which covers the back panel; at least one circuit board, which is arranged on the back panel; the circuit board includes a circuit board body and a plurality of components arranged on the circuit board body, at least some of the components are located on the side of the circuit board body facing the rear shell; a silencer unit, which is configured to reduce the noise generated by the vibration of at least some of the components; the silencer unit has a resonance cavity, the end of the resonance cavity facing the circuit board body has an opening, the opening of the resonance cavity and the components of the circuit board are arranged relative to each other, the resonance cavity has a variable volume, and the cross-sectional area of ​​the opening is smaller than the cross-sectional area of ​​the resonance cavity.

[0030] Through the above arrangement, that is, utilizing the principle of Helmholtz resonance, by arranging a resonator with a Helmholtz cavity in the silencer unit, the sound waves passing through the Helmholtz cavity will be reflected and reversed to offset 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 the noise frequency, thereby achieving the purpose of eliminating the noise. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] In order to more clearly illustrate the technical solutions in the embodiments of the present invention or related technologies, the following briefly introduces the drawings required for use in the embodiments or related technical descriptions. Obviously, the drawings described below are some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative labor.

[0032] Figure 1 A partial structural schematic diagram of a display device provided in an embodiment of the present application;

[0033] Figure 2 An assembly diagram of a circuit board and a muffler unit in a display device provided in an embodiment of the present application;

[0034] Figure 3 Another assembly diagram of a circuit board and a muffler unit in a display device provided in an embodiment of the present application;

[0035] Figure 4 A schematic diagram of the principle of a first viewing angle of a muffler unit in a display device provided in an embodiment of the present application;

[0036] Figure 5 A schematic diagram of the principle of a second viewing angle of a muffler unit in a display device provided in an embodiment of the present application;

[0037] Figure 6 A front view of a sound-absorbing unit in a display device provided by an embodiment of the present application;

[0038] Figure 7 A schematic cross-sectional view of a sound-absorbing unit in a display device provided in an embodiment of the present application;

[0039] Figure 8 A schematic structural diagram of a sound-absorbing unit in a display device provided in an embodiment of the present application when the bottom plate is in a first position;

[0040] Fig. 9 A schematic structural diagram of a muffler unit in a display device provided in an embodiment of the present application when the bottom plate is in the second position;

[0041] Fig.10 A schematic diagram of the structure of another noise reduction unit in a display device provided in an embodiment of the present application;

[0042] Fig.11 This is a schematic structural diagram of a third type of silencer unit in a display device provided in an embodiment of the present application.

[0043] Description of reference numerals:

[0044] 100-display device; 110-rear shell; 121-circuit board; 1201-circuit board body; 1202-components; 121a-power board; 121b-movement board; 130-silencer unit; 131-resonator; 1311-resonance shell; 1312-bottom plate; 132-threaded moving mechanism; 1321-screw sleeve; 1322-screw rod; 133-blocking wall; 140-connecting unit; 141-connecting piece; 150-back plate; 160-silencer cotton; 170-moving structure; 171-moving track; 172-slider. DETAILED DESCRIPTION

[0045] In order to make the purpose, technical solution and advantages of the embodiments of the present invention clearer, the technical solution in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention. All other embodiments obtained are within the scope of protection of the present invention. In the absence of conflict, the following embodiments and features in the embodiments can be combined with each other.

[0046] In the present invention, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements, unless otherwise clearly defined. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0047] In the present invention, unless otherwise clearly specified and limited, a first feature being "above" or "below" a second feature may mean that the first and second features are in direct contact, or the first and second features are in indirect contact through an intermediate medium. Moreover, a first feature being "above", "above" or "above" a second feature may mean that the first feature is directly above or obliquely above the second feature, or simply means that the first feature is higher in level than the second feature. A first feature being "below", "below" or "below" a second feature may mean that the first feature is directly below or obliquely below the second feature, or simply means that the first feature is lower in level than the second feature.

[0048] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "example", "specific example", or "some examples" etc. means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described may be combined in any one or more embodiments or examples in a suitable manner. In addition, those skilled in the art may combine and combine the different embodiments or examples described in this specification and the features of the different embodiments or examples, without contradiction.

[0049] Display devices such as flat panel displays and televisions can be used to display images. Taking a liquid crystal display (LCD) device as an example, a liquid crystal display device is mainly composed of a backlight module, a liquid crystal panel, and a drive circuit. As a display panel, the liquid crystal panel does not emit light by itself, and needs to rely on the light source provided by the optical elements in the backlight module to achieve brightness display. The display principle of the liquid crystal display is to place the liquid crystal between two pieces of conductive glass, and rely on the electric field between the two electrodes to drive the electric field effect of the liquid crystal molecules to twist the nematics, so as to control the transmission or shielding function of the backlight source, thereby displaying the image. If a color filter is added, a color image can be displayed.

[0050] In the display device in the related art, the circuit board is arranged on the back plate, and the circuit board includes a circuit board body and components. The components are arranged on the circuit board body and face the rear shell. Since there is a deviation in the assembly between the components such as capacitors, inductors, relays in the circuit board near the rear shell and the circuit board body, when the display device plays sound and pictures, the components will vibrate under the action of resonance, thereby generating noise. In order to reduce and eliminate noise, the general practice in the related art is to install and paste buffer materials such as non-woven fabrics or sponges between the circuit board body and the components for silencing. However, in the shock-absorbing method of the related art, since the processing dimensions of the circuit board body and the components themselves have corresponding tolerances, the distance between the circuit board body and the components changes, and the buffer material cannot match the changed distance, which ultimately weakens the vibration reduction effect.

[0051] In order to overcome the defects in the related art, the display device provided by the present invention utilizes the principle of Helmholtz resonance. A resonator with a Helmholtz cavity is arranged in the sound-absorbing unit. Since the sound waves passing through the Helmholtz cavity will be reflected and reversed to offset the original sound waves, the noise reduction effect is achieved. Secondly, the volume of the Helmholtz cavity can be adjusted according to the change of the noise frequency, thereby achieving the purpose of eliminating the noise.

[0052] The content of the present invention will be described in detail below in conjunction with the accompanying drawings so that those skilled in the art can understand the content of the present invention more clearly and in detail.

[0053] Figure 1 A partial structural schematic diagram of a display device provided in an embodiment of the present application, Figure 2 An assembly diagram of a circuit board and a muffler unit in a display device provided in an embodiment of the present application is provided. Figure 3 Another assembly diagram of a circuit board and a muffler unit in a display device provided in an embodiment of the present application is shown in FIG. Figure 4 This is a schematic diagram of the principle of a first viewing angle of a muffler unit in a display device provided in an embodiment of the present application. Figure 5 This is a schematic diagram of the principle of the second viewing angle of the muffler unit in the display device provided in an embodiment of the present application, Figure 6 A front view of a sound-absorbing unit in a display device provided in an embodiment of the present application.

[0054] <Composition of Display Device 100>

[0055] like Figures 1 to 6 As shown, an embodiment of the present application provides a display device 100 , which may be a liquid crystal display device.

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

[0057] The housing includes a front housing and a rear housing 110 , and the rear housing 110 is located at the back side of the front housing.

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

[0059] In some embodiments, the display device 100 also includes a backlight module, which is arranged on a side of the display surface away from the display panel and is configured to provide backlight lamp beads to the display panel. The backlight module includes an optical film group and a light board. The optical film group is located between the display panel and the light board. The light board 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 , and the circuit boards 121 include 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 panel 150 disposed on the rear side of the light panel and supporting the backlight module and the circuit board 121 .

[0062] In some embodiments, the display device 100 further includes a muffler unit 130, which is disposed on the rear housing. The muffler unit 130 has a Helmholtz cavity with a variable volume, and the Helmholtz cavity has an opening, wherein the opening is arranged opposite to the components 1202 on the circuit board 121, and the circuit board 121 is mounted on the back plate 150. The circuit board 121 includes a circuit board body 1201 and components 1202, and the components 1202 are disposed on the circuit board body 1201 and face the rear housing 110. Since the components 1202 such as capacitors, inductors, and relays in the circuit board near the rear housing are in contact with the components 1202, There is a deviation in the assembly between the circuit board bodies 1201. When the display device 100 plays sound and pictures, the components 1202 on the circuit board 121 will vibrate under the resonance caused by the sound waves and generate noise. By setting a Helmholtz cavity with a variable volume in the muffler unit 130, the sound waves passing through the Helmholtz cavity will be reflected and thus offset the original sound waves, thereby achieving the effect of noise reduction; secondly, the Helmholtz cavity can adjust its volume according to the change of the noise frequency, so that the frequency of the waves reflected by the Helmholtz cavity matches the frequency of the noise, thereby achieving the purpose of eliminating the noise.

[0063] In addition, the noise reduction and silencing can be performed by installing the silencing unit 130, which makes the entire installation process relatively simple and the operation is efficient. At the same time, compared with the noise reduction method of the related art, the present application can solve the problem that the components 1202 on the circuit board 121 cannot be reduced in noise by adding a fixed structure or a vibration reduction material due to their own resonance.

[0064] In some embodiments, the display device 100 further includes a connection unit 140 , a first end of the connection unit 140 is disposed on the rear shell 110 , and a second end of the connection unit 140 is connected to the silencer unit 130 . The connection unit 140 can ensure stable installation of the silencer unit 130 .

[0065] The structures of various parts of the display device will be described in sequence below with reference to the accompanying drawings.

[0066] <Housing>

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

[0068] <Display Panel>

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

[0070] The display panel includes a touch glass and a liquid crystal screen, which are stacked in sequence along the thickness direction of the display device 100 .

[0071] It can be understood that the display panel has a sky side, a ground side, a left side, a right side, and a front side and a rear side. The left side and the right side of the display panel refer to the left side and the right side of the user when the user faces the touch glass and performs 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 upper side of the display panel is the sky side, and the lower side of the display panel is the ground side. In this way, the touch glass is arranged in front of the LCD screen to protect the LCD screen.

[0072] The display panel is a main component of the display device 100, which mainly includes a liquid crystal display panel, a color filter (CF) substrate of the liquid crystal display panel, a thin film transistor (TFT) substrate (also called an array substrate) and a liquid crystal (LC) layer, and the liquid crystal layer is located between the color filter substrate and the array substrate. Among them, the thin film transistor substrate is provided with data lines and scan lines, and the liquid crystal molecules are controlled to change direction by powering on or off the data lines and scan lines, so that the light of the light source is emitted through the color filter substrate and a picture of a preset color is generated.

[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, which includes a light board. The light board is arranged on a side of the display surface away from the display panel, and the light board is used to generate light. The light board is configured to provide backlight to the display panel.

[0075] It can be understood that the light board is to provide sufficient brightness and evenly distributed backlight for the display panel, and the display panel can modulate the backlight as needed to display different images.

[0076] In some embodiments, the light board may include a light board body and a light source. The light source may be a light-emitting diode (LED), a sub-millimeter light-emitting diode (Mini-Light Emitting Diode, Mini LED) or a micron-level light-emitting diode (Micro-Light Emitting Diode, Micro LED).

[0077] There may be multiple light sources, and the multiple light sources are arranged on a side of the light board body facing the display panel and are arranged at intervals, so that the light sources provide backlight for the display panel.

[0078] Among them, the light source can be a lamp bead or a light strip, etc., and multiple light sources can be fixed on the light board body by means of snap connection, threaded connection, etc.

[0079] <Circuit board 121>

[0080] The circuit board 121 is disposed on the back plate 150 .

[0081] It should be noted that any circuit board 121 includes a circuit board body 1201 and components 1202, and the components 1202 are arranged on the circuit board body 1201. It is understandable that the circuit board 121 will remain parallel or approximately parallel to the display panel of the display device 100, so one side of the circuit board 121 faces the display panel, and the other side faces the rear housing 110. Due to the internal space limitation 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 housing 110.

[0082] Among them, at least one circuit board 121 can be a type of circuit board, for example, it can include a power board 121a and a core board 121b, etc. Among them, the power board 121a is mainly used to power the display device 100, and the core 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, components such as capacitors, inductors, and relays in the circuit board 121 encounter sound waves generated by the speaker, which will cause structural resonance and generate noise. For this reason, the noise reduction unit 130 can be used to reduce the noise.

[0084] <Silencer Unit 130>

[0085] The muffler unit 130 includes a resonator 131 . The resonator 131 has a Helmholtz cavity with a variable volume. The opening of the Helmholtz cavity and the components 1202 on the circuit board 121 are arranged opposite to each other.

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

[0087] The following is an introduction to the principle of noise reduction using a Helmholtz cavity, with reference to the accompanying drawings:

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

[0089] In addition, it should be noted that a mass block connected to a spring, when 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 (without considering air resistance and friction). Here, imagine the air at the bottleneck as an air mass block, and the air in the cavity plays the role of a spring. Finally, the calculation formula for the resonant frequency can be derived as follows:

[0090]

[0091] Among them, 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 propagation in the air. It can be seen that the larger the volume, the smaller the cross-sectional area, and the lower the resonant frequency.

[0092] It should be noted that the original shape of the Helmholtz resonator is a container with a thin neck or a small opening. When affected by sound waves, the air in the neck vibrates, and the air in the container generates a restoring force. When the wavelength of the sound wave is much larger than the geometric scale of the resonator, it can be considered that the kinetic energy of the air vibration in the resonator is concentrated on the movement of the air in the neck, and the potential energy is only related to the elastic deformation of the air in the container. In this way, the Helmholtz resonator is a one-dimensional vibration system composed of the effective mass of the air in the neck and the elasticity of the air in the container. Therefore, it resonates with the acting sound waves, and the resonant frequency is where f0 is the resonant frequency of the Helmholtz resonator, с 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 sound waves of a certain intensity, at this resonant frequency, the vibration speed of the air in the neck is the largest.

[0093] Therefore, utilizing the principle of Helmholtz resonance, a resonator having a Helmholtz cavity can be provided in the muffler unit 130. Since the sound waves entering the Helmholtz cavity through the opening will be reflected, thereby canceling out the original sound waves, the Helmholtz cavity is provided opposite to the noise source, and the opening of the Helmholtz cavity faces the noise source. The Helmholtz cavity can be utilized to emit a canceling sound wave that is opposite to the sound wave of the noise source and has the same frequency as the sound wave of the noise source, so as to cancel out the noise of the noise source and achieve a noise reduction effect.

[0094] However, due to certain assembly and manufacturing tolerances between the components such as capacitors, inductors, relays 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 muffler unit 130 may have adjustable parameters to adapt to different actual conditions of the circuit board 121. The Helmholtz cavity may have an adjustable volume to match the reverse sound waves generated by the Helmholtz with the noise sound waves generated by the circuit board 121.

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

[0096] The bottom plate 1312 is movably disposed relative to the resonance shell 1311 to change the volume of the Helmholtz cavity.

[0097] It can be understood that the first end of the resonance shell 1311 is away from the circuit board 121, and the second end of the resonance shell 1311 faces the circuit board 121, wherein the bottom plate 1312 at the first end of the resonance shell 1311 moves in a direction away from or close to the circuit board 121 to change the volume of the Helmholtz cavity.

[0098] According to the above content, the larger the volume of the Helmholtz cavity, the smaller the cross-sectional area, and the lower the resonance frequency. It can be understood that when the noise frequency to be adjusted is low, the bottom plate 1312 can be moved so that the bottom plate 1312 moves in a direction away from the opening to increase the volume of the Helmholtz cavity.

[0099] Accordingly, when the frequency of the noise to be adjusted is relatively large, the bottom plate 1312 may be moved so as to move toward the direction close to the opening to reduce the volume of the Helmholtz cavity.

[0100] In summary, by adjusting the position of the bottom plate 1312 relative to the resonance shell 1311 , the volume of the Helmholtz cavity is adjusted to further match a more appropriate noise to be eliminated.

[0101] In order to facilitate the movement of the bottom plate 1312, in some embodiments, the shape of the cross section of the resonance shell 1311 from the direction toward the opening to the direction away from the opening remains consistent, and the cross-sectional area remains unchanged, so that the bottom plate 1312 can be moved more conveniently in the direction close to the opening and away from the opening, and the structure of the bottom plate 1312 itself and the connection structure of the bottom plate 1312 relative to the resonance shell 1311 will not change when the bottom plate 1312 moves.

[0102] Figure 7 This is a schematic cross-sectional view of a sound-absorbing unit in a display device provided in an embodiment of the present application. Figure 2 as well as Figure 7 As shown, in some examples, the resonance shell 1311 and the bottom plate 1312 can be movably connected via the movable structure 170. The movable structure 170 has different parts that can move relatively to each other, and the different parts are respectively connected to the resonance shell 1311 or the rear shell 110, so that the resonance shell 1311 is driven to move relative to the rear shell 110 through 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 , and an extending direction of the moving structure 170 is consistent with a moving direction of the bottom plate 1312 .

[0104] Exemplarily, there are two movable structures 170, which are respectively connected to the outer walls on opposite sides of the resonance shell 1311, wherein the opposite ends of the bottom plate 1312 are slidably connected to the ends of the two movable structures 170, and the bottom plate 1312 can reciprocate on the movable structure 170 in a direction close to the opening or away from the opening to change the volume of the Helmholtz cavity.

[0105] In some examples, the movable structure 170 and the side wall of the resonance shell 1311 may be connected in a detachable manner, such as by bolts, buckles, or hanging, to facilitate subsequent maintenance and replacement.

[0106] Alternatively, the moving structure 170 and the side wall of the resonance shell 1311 may also be connected by other connection methods. Here, the connection method of the moving structure 170 and the side wall of the resonance shell 1311 is not limited.

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

[0108] In order to allow the bottom plate 1312 to always form a closed resonance cavity with the resonance shell 1311 during the movement, the shape of the bottom plate 1312 can be adapted to the shape and size of the end portions where the resonance shell 1311 and the bottom plate 1312 are in contact. In this way, the end of the resonance cavity away from the outlet is always kept in a closed state, and the bottom plate 1312 will not affect the normal vibration reduction and noise reduction of the resonance cavity when it moves.

[0109] In some embodiments of the present application, the movement direction of the bottom plate 1312 relative to the resonance shell 1311 is along the line connecting the first end and the second end of the resonance shell 1311. Such a movement direction design can more conveniently change the volume of the Helmholtz cavity.

[0110] In some examples, the cross-sectional shape of the resonance shell 1311 in a direction perpendicular to the movement direction of the base plate 1312 can be set to a rectangle, and accordingly, the base plate 1312 can be a rectangular plate-like structure. The embodiment of the present application is described by taking the shape contours of the resonance shell 1311 and the base plate 1312 as being set to a rectangle as an example.

[0111] Figure 8 This is a schematic structural diagram of a sound-absorbing unit in a display device provided in an embodiment of the present application when the bottom plate is in the first position. Fig. 9 A schematic structural diagram of a sound-absorbing unit in a display device provided in an embodiment of the present application when the bottom plate is in the second position.

[0112] like Figure 8 , Fig. 9 As shown, in other embodiments of the present application, in order to allow the bottom plate 1312 in the muffler unit 130 to be more accurately adjusted relative to the resonance shell 1311, the muffler unit 130 may further include a threaded moving mechanism 132, the threaded moving mechanism 132 including a screw 1322 connected to the resonance shell 1311 and a screw sleeve 1321 connected to the bottom plate 1312, the screw sleeve 1321 and the screw 1322 are screwed together to drive the bottom plate 1312 to move relative to the resonance shell 1311. In this way, the screw sleeve 1321 and the screw 1322 are loosened or tightened with each other, thereby driving the bottom plate 1312 to move relative to the resonance shell 1311, and finally changing the volume of the Helmholtz cavity.

[0113] Similar to the structure using the moving track 171, this design can realize the movement of the bottom plate 1312 relative to the resonance shell 1311, thereby changing the volume of the Helmholtz cavity. Compared with the method of using the relative sliding of the moving track 171 and other structures to complete the movement of the bottom plate 1312, the method of using the threaded moving mechanism 132 can ensure the stability of the adjustment and the position accuracy, and ensure that the bottom plate 1312 is in the correct position.

[0114] It should be noted that the specific location and manner of the screw sleeve 1321 and the screw rod 1322 are not limited in the embodiments of the present application as long as the above-mentioned purpose can be met.

[0115] It can be seen from the foregoing that in some embodiments of the present application, reference Figure 1 and Figure 2 The circuit board 121 includes a power board 121a and a movement board 121b, and the noise comes from the noise caused by the resonance of the components 1202 of the power board 121a and the movement board 121b. Therefore, the opening of the Helmholtz cavity in the muffler unit 130 needs to face the power board 121a and the movement board 121b. When the power board 121a and the movement board 121b are not in the same position, or the power board 121a and the movement board 121b are large in area, a single Helmholtz cavity may not be able to ensure vibration reduction and noise reduction for all components 1202.

[0116] Therefore, in order to adapt to the situation where the circuit board 121 has a large area or there are multiple circuit boards, in some embodiments of the present application, the resonator 131 has at least two Helmholtz cavities, and the at least two Helmholtz cavities are arranged side by side in a direction parallel to the board surface of the circuit board 121, and the openings of each Helmholtz cavity are opposite to the circuit board 121, such as Figures 1 to 9 shown.

[0117] At this time, the length of the resonator 131 formed by the multiple Helmholtz cavities arranged side by side 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 opening facing a different position of the circuit board 121, or facing different circuit boards, 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. Specifically, the embodiments of the present application do not impose too many restrictions on this.

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

[0120] Specifically, Figure 8 and Fig. 9As shown, in some embodiments of the present application, the inner cavity of the resonance shell 1311 has at least two baffles 133, and the baffles 133 divide the inner cavity of the resonance shell 1311 into at least two cavities, and the bottom plate 1312 surrounds the at least two cavities into Helmholtz cavities. When there are multiple baffles 133, the multiple baffles 133 can be arranged at intervals, for example, arranged at intervals along the length direction of the resonator 131.

[0121] In some embodiments, the barrier wall 133 is disposed between two adjacent Helmholtz cavity openings and is located inside the resonance shell 1311 to separate the inner cavity of the resonance shell 1311 into at least two cavities.

[0122] It should be noted that, since the bottom plate 1312 is movable relative to the resonance shell 1311 , the length direction of the retaining wall 133 matches the moving direction of the bottom plate 1312 , so that the retaining wall 133 extends along the moving direction of the bottom plate 1312 to avoid affecting the movement of the bottom plate 1312 .

[0123] In some embodiments, one end of the baffle wall 133 is fixed to the end wall of the resonance shell 1311, and the other end is fixed to the rear shell 110. A plurality of openings are provided on the bottom plate 1312, and each opening corresponds to a baffle wall 133, which means that a plurality of openings are arranged at intervals on the bottom plate 1312 along the extension direction of the bottom plate 1312, and a plurality of openings correspond to a plurality of baffle walls 133. The baffle wall 133 passes through the openings. When the bottom plate 1312 moves relative to the resonance shell 1311, the bottom plate 1312 moves relative to the baffle wall 133, and the openings can be located at different positions of the baffle wall 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 resonance shell 1311 and the baffle wall 133 can be configured to be integrally formed. This can not only improve the connection strength between the resonance shell 1311 and the baffle wall 133, but also achieve seamless connection between the resonance shell 1311 and the baffle wall 133, improve the installation efficiency of the vibration connection part, and reduce the risk of cracking at the connection position between the resonance shell 1311 and the baffle wall 133.

[0125] Fig.10 This is a schematic diagram of the structure of another noise reduction unit in the display device provided in an embodiment of the present application, such as Fig.10 As shown, as an optional implementation, considering the sealing performance of the Helmholtz cavity, in other embodiments, one end of the baffle 133 is fixed to the end wall of the resonance shell 1311, and the other end is fixed to the bottom plate 1312, which means that the baffle 133 can move with the bottom plate 1312, thereby changing the volume of the Helmholtz cavity. When the bottom plate 1312 moves relative to the resonance shell 1311, the baffle 133 will also move relative to the resonance shell 1311 with the bottom plate 1312.

[0126] It should be noted that the retaining wall 133 and the bottom plate 1312 can be assembled as a single component, thereby improving the convenience of assembling the silencer unit 130 and reducing the space required for installing the silencer unit 130 .

[0127] In some examples, the baffle 133 may be a plate-shaped member, and the width of the baffle 133 is consistent with the width of the resonance shell 1311, so that the inner cavity of the resonance shell 1311 can be divided into at least two cavities by the baffle 133, wherein the volumes of at least two cavities can be the same, so that when the bottom plate 1312 moves relative to the resonance shell 1311, the volume change of each cavity remains consistent, thereby achieving a better sound-absorbing effect.

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

[0129] First, it is necessary to identify the component resonance noise frequency of the circuit board 121 when the display device 100 is in working state, 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 propagation 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 considered that the kinetic energy of the air vibration in the cavity is concentrated on the movement of the air in the pipe length L, and the potential energy is only related to the elastic deformation of the air in the container. In this way, the cavity is composed of the effective mass of the air in the pipe and the elasticity of the air in the container to form a one-dimensional vibration system.

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

[0133] Next, adjustment and adaptation can be performed according to the resonance and noise frequency of the display device 100. When the noise frequency f to be eliminated increases, the bottom 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 bottom 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] Fig.11 This is a schematic diagram of the structure of a third type of muffler unit in a display device provided in an embodiment of the present application. Figures 1 to 11 As shown, in some embodiments of the present application, the Helmholtz cavity is filled with sound-absorbing cotton 160.

[0135] It is understandable that the Helmholtz cavity may be filled with sound-absorbing cotton 160 to further improve the sound-absorbing effect.

[0136] It should be noted that the noise generated by the components 1202 such as capacitors, inductors, and relays in the circuit board during work first enters the Helmholtz cavity through the opening. Since the sound waves passing through the Helmholtz cavity will be reflected and reversed to offset the original sound waves, most of the noise can be eliminated. 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 in the Helmholtz cavity by filling.

[0138] In other examples, the sound-absorbing cotton 160 can be attached to the side wall of the resonance shell 1311 by gluing, which can ensure the stability of the sound-absorbing cotton 160. Such a setting allows the sound-absorbing cotton 160 to be always in the Helmholtz cavity when the bottom plate 1312 moves relative to the resonance shell 1311, thereby achieving a better sound absorption effect and having a higher stability.

[0139] Exemplarily, when the sound-absorbing cotton 160 is attached to the side wall of the resonance shell 1311 , the sound-absorbing cotton 160 may be a planar structure with a relatively thin thickness, and the length direction of the planar structure formed by the sound-absorbing cotton 160 is consistent with the moving direction of the bottom 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] Exemplarily, the sound-absorbing cotton 160 can be synthesized from a single fiber, such as polyester fiber, glass fiber, etc.; the sound-absorbing cotton 160 can also be formed by processing multiple fibers; the embodiment of the present invention does not limit the specific material of the sound-absorbing cotton 160.

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

[0143] Through the above-mentioned setting, that is, through the setting of the silencer unit 130, since the sound waves passing through the Helmholtz cavity will be reflected and reversed to offset the original sound waves, it is used to reduce noise. Therefore, the resonator 131 in the silencer unit 130 has a Helmholtz cavity, which uses the principle of Helmholtz resonance to reduce noise, and the volume of the Helmholtz cavity can be adjusted according to the change of the noise frequency, thereby achieving the purpose of eliminating noise, and the effect is better.

[0144] <Connection Unit 140>

[0145] like Figures 1 to 11As shown, in some optional examples of the present invention, the connecting unit 140 includes a connecting member 141 , and the connecting member 141 is clamped on the rear shell 110 .

[0146] Exemplarily, the first end of the connector 141 is detachably disposed on the rear shell 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 resonance shell 1311, wherein, in order to increase the installation stability of the resonance shell 1311, the connector 141 is integrally designed with the resonance shell 1311, and connection holes are provided on the rear shell 110 and the connector 141, and the threaded fasteners pass through the two connection holes in sequence and are tightened, thereby connecting the rear shell 110 and the connector 141 to each other.

[0147] It is understandable that the design of the connecting member 141 facilitates the connection of the resonance shell 1311 to the rear shell 110 .

[0148] It should be noted that, considering that the rear shell is generally thin, the muffler unit 130 can be disposed 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 disposed opposite to each other.

[0149] Therefore, in some other optional examples of the present invention, the first end of the connecting member 141 is detachably arranged on the back plate 150, and the second end of the connecting member 141 is connected to the muffler unit 130. The second end of the connecting member 141 can be connected to the side wall of the resonance shell 1311, wherein, in order to increase the installation stability of the resonance shell 1311, the connecting member 141 is designed as an integral whole with the resonance shell 1311, and connecting holes are provided on the back plate 150 and the connecting member 141, and the threaded fasteners pass through the two connecting holes in sequence and are tightened, thereby connecting the back plate 150 and the connecting member 141 to each other.

[0150] In some other embodiments, a notch is provided on the rear shell 110, and the connecting member 141 is snapped into the notch, wherein the shapes of the connecting member 141 and the notch match each other.

[0151] In some embodiments, there are multiple movable structures 170 and multiple connecting members 141 , and the multiple movable structures 170 correspond to the multiple connecting members 141 and are respectively located at opposite ends of the sound-absorbing shell.

[0152] The display device provided in the embodiment of the present application includes a back panel; a rear shell, which covers the back panel; at least one circuit board, which is arranged on the back panel; the circuit board includes a circuit board body and a plurality of components arranged on the circuit board body, at least some of the components are located on the side of the circuit board body facing the rear shell; a silencer unit, which is configured to reduce the noise generated by the vibration of at least some of the components; the silencer unit has a resonance cavity, the end of the resonance cavity facing the circuit board body has an opening, the opening of the resonance cavity and the components of the circuit board are arranged relative to each other, the resonance cavity has a variable volume, and the cross-sectional area of ​​the opening is smaller than the cross-sectional area of ​​the resonance cavity.

[0153] Through the above arrangement, that is, utilizing the principle of Helmholtz resonance, by arranging a resonator with a Helmholtz cavity in the silencer unit, the sound waves passing through the Helmholtz cavity will be reflected and reversed to offset 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 the noise frequency, thereby achieving the purpose of eliminating the noise.

[0154] In the description of the present invention, it is to be understood that the terms “center”, “longitudinal”, “lateral”, “length”, “width”, “thickness”, “up”, “down”, “front”, “back”, “left”, “right”, “vertical”, “horizontal”, “top”, “bottom”, “inside”, “outside”, “clockwise”, “counterclockwise”, “axial”, “radial”, “circumferential”, etc., indicating orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as limiting the present invention.

[0155] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include at least one of the features. In the description of the present invention, the meaning of "plurality" is at least two, such as two, three, etc., unless otherwise clearly and specifically defined.

[0156] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or replace some or all of the technical features therein with equivalents. However, these modifications or replacements 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; A rear shell, the rear shell covers the back plate; At least one circuit board, the circuit board is arranged on the back plate; the circuit board comprises a circuit board body and a plurality of components arranged on the circuit board body, at least some of the components are located on a side of the circuit board body facing the rear shell; A silencer unit is configured to reduce the noise generated by the vibration of at least part of the components; the silencer unit has a resonance cavity, the end of the resonance cavity facing the circuit board body has an opening, the opening of the resonance cavity and the components of the circuit board are arranged relative to each other, the resonance cavity has a variable volume, and the cross-sectional area of ​​the opening is smaller than the cross-sectional area of ​​the resonance cavity.

2. The display device according to claim 1, characterized in that The resonance cavity is a Helmholtz cavity.

3. The display device according to claim 2, characterized in that: The muffler unit includes a resonator; The resonator comprises a resonance shell and a bottom plate; the first end of the resonance shell is open, and the bottom plate is covered on the first end of the resonance shell to enclose the Helmholtz cavity together with the resonance shell, and the second end of the resonance shell faces the circuit board and forms an opening of the Helmholtz cavity; The bottom plate is movably arranged relative to the resonance shell to change the volume of the Helmholtz cavity.

4. The display device according to claim 3, characterized in that: The moving direction of the bottom plate relative to the resonance shell is along the connecting line between the first end and the second end of the resonance shell.

5. The display device according to claim 3, characterized in that: The muffler unit also includes a threaded moving mechanism; The threaded moving mechanism comprises a screw connected to the resonance shell and a screw sleeve connected to the bottom plate. The screw sleeve and the screw are screwed together to drive the bottom plate to move relative to the resonance shell.

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

7. The display device according to claim 2, characterized in that: At least one of the circuit boards includes a power supply board and a core board, and the power supply board and the core board are respectively arranged opposite to the openings of each of the Helmholtz cavities of the muffler unit.

8. The display device according to claim 3, characterized in that: The inner cavity of the resonance shell is provided with at least two spaced-apart retaining walls, the retaining walls divide the inner cavity of the resonance shell into at least two cavities, and the bottom plate surrounds the at least two cavities to form the Helmholtz cavities respectively.

9. The display device according to claim 2, characterized in that: The Helmholtz cavity is provided with sound-absorbing cotton.

10. The display device according to claim 8, characterized in that: The width of the blocking wall is equal to the width of the resonance shell.

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