Vehicle-mounted display device

Abstract

The embodiment of the invention provides a vehicle-mounted display device, and belongs to the technical field of display, the vehicle-mounted display device comprises a display module and a shell connected to the backlight side of the display module, and at least one cavity is formed between the display module and the shell; the multiple isolation units are arranged on the inner wall, facing the display module, of the shell, and the multiple isolation units are located in the at least one cavity; wherein the multiple isolation units are arranged at intervals in the first direction, and gaps are formed between the isolation units and the inner side wall of the shell; the size of the isolation unit in the second direction is smaller than the size of the cavity in the second direction; the first direction is perpendicular to the second direction, and the second direction is parallel to the light emitting direction of the display module. Through the vehicle-mounted display device provided by the embodiment of the invention, the noise generated by the vehicle-mounted display device in the tactile feedback process can be reduced, and the use experience of a user is improved.

Description

Technical Field

[0001] The embodiments of the present application relate to the field of display technology, and in particular, to a vehicle-mounted display device. Background Art

[0002] Display screens equipped with tactile feedback modules have been used in the automotive field. This type of structure uses a linear motor or piezoelectric plate to drive a mass block that is tightly connected to the display screen, so that the screen and the mass block vibrate in the same direction. The vibration frequency is usually set to the area where human fingers are most sensitive, that is, around 200Hz. The noise of tactile feedback devices mainly comes from two aspects: first, there are through holes on the back shell of the screen for data cables and power cables to lead out. The through holes and the shell itself form a resonance cavity, which amplifies the noise; second, when the screen is driven, it generates out-of-plane vibrations, causing the noise to propagate in a direction perpendicular to the screen surface. The above-mentioned noise frequency band is relatively narrow, which is the same as the vibration frequency of the drive module. Reducing noise while ensuring that the tactile feedback vibration is not weakened is an important optimization direction for tactile feedback displays. Summary of the invention

[0003] An embodiment of the present application provides a vehicle-mounted display device, aiming to reduce the noise generated by the vehicle-mounted display device during tactile feedback and improve the user experience.

[0004] The embodiment of the present application provides a vehicle-mounted display device, including: A display module and a housing connected to a backlight side of the display module, wherein at least one cavity is formed between the display module and the housing; A plurality of isolation units are arranged on the inner wall of the housing facing the display module, and the plurality of isolation units are located in the at least one cavity; Wherein, a plurality of the isolation units are arranged at intervals along the first direction, and there is a gap between the isolation units and the inner side wall of the shell; the size of the isolation unit in the second direction is smaller than the size of the cavity in the second direction; The first direction is perpendicular to the second direction, and the second direction is parallel to the light emitting direction of the display module.

[0005] Optionally, the display module includes a display screen, a driving structure and a connecting block, the driving structure is connected to the display screen via the connecting block, and the driving structure is used to drive the connecting block to drive the display screen to vibrate in the first direction; A first cavity is formed between the display screen and the housing, and a second cavity is formed between the connecting block and the housing; A plurality of isolation units are disposed in the first cavity and the second cavity.

[0006] Optionally, the distance between the isolation unit and the inner side wall of the shell is the same as the distance between two adjacent isolation units.

[0007] Optionally, the distance between two adjacent isolation units is one quarter of the wavelength of the noise to be absorbed.

[0008] Optionally, a size of the isolation unit in the second direction is 0.95 times to 0.99 times a size of the cavity in the second direction.

[0009] Optionally, a sound-permeable hole is provided on the shell between two adjacent isolation units, and the distance between the sound-permeable hole and the isolation units on both sides is equal.

[0010] Optionally, the diameter of the sound-permeable hole is greater than or equal to 1.0 mm and less than or equal to 2.0 mm.

[0011] Optionally, the sound-permeable hole is filled with sound-absorbing material.

[0012] Optionally, the housing comprises a first part and a plurality of second parts, and a material of the second parts is different from a material of the first parts; The position of the second portion corresponds to the position of some of the isolation units among the plurality of isolation units.

[0013] Optionally, a size of the second portion in the first direction is the sum of a size of a corresponding isolation unit in the first direction and a spacing size between two adjacent isolation units.

[0014] Optionally, a damping layer is provided on the inner wall of the shell, and an orthographic projection of the damping layer on the shell does not overlap with an orthographic projection of the isolation unit on the shell.

[0015] Optionally, a Helmholtz cavity is provided on the inner wall of the housing at a position between two adjacent isolation units; The size of the Helmholtz cavity in the first direction is equal to the distance between two adjacent isolation units.

[0016] Optionally, a plurality of piezoelectric sheets are provided on the backlight side of the display module, and the piezoelectric sheets are used to apply vibrations in a direction opposite to the out-of-plane vibration direction to the display module; The out-of-plane vibration is the vibration of the display module in the second direction.

[0017] Optionally, the piezoelectric piece is located at a peak or a trough of a vibration mode generated by the out-of-plane vibration.

[0018] Optionally, the isolation unit is configured to be in a strip shape, and a length direction of the strip-shaped isolation unit is perpendicular to both the first direction and the second direction.

[0019] Beneficial effects: The present application provides a vehicle-mounted display device, which includes a display module and a shell, wherein at least one cavity is formed between the display module and the shell, and a plurality of isolation units are arranged on the inner wall of the shell facing the display module, wherein the isolation units are located in the at least one cavity, wherein the plurality of isolation units are arranged at intervals in a first direction, and there is a gap between the isolation units and the inner side wall of the shell, and the size of the isolation units in a second direction is smaller than the size of the cavity in the second direction; in this way, the cavity can be divided into a plurality of smaller sized chambers by using a plurality of isolation units, thereby reducing the noise generated by chamber resonance during the tactile feedback process of the vehicle-mounted display device, thereby improving the user experience. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings required for use in the description of the embodiments of the present application will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative labor.

[0021] Figure 1 It is a schematic diagram of an exploded structure of a vehicle-mounted display device proposed in one embodiment of the present application; Figure 2 is a schematic structural diagram of an XZ cross section of an in-vehicle display device proposed in one embodiment of the present application; Figure 3 It is a structural schematic diagram of a vehicle-mounted display device with a sound-transmitting hole proposed in one embodiment of the present application; Figure 4 1 is a schematic structural diagram of a vehicle-mounted display device including a first part and a second part of a housing proposed in an embodiment of the present application; Figure 5 is a structural schematic diagram of a vehicle-mounted display device with a damping layer proposed in one embodiment of the present application; Figure 6 is a structural schematic diagram of a vehicle-mounted display device with a Helmholtz cavity proposed in one embodiment of the present application; Figure 7 This is a schematic structural diagram of an XZ cross section of a Helmholtz cavity proposed in an embodiment of the present application; Figure 8 This is a schematic diagram of the structure of an XY cross section of a Helmholtz cavity proposed in an embodiment of the present application; Fig. 9It is a structural schematic diagram of a vehicle-mounted display device with a piezoelectric sheet proposed in one embodiment of the present application; Fig.10 is a schematic diagram of the sound pressure level of noise of a vehicle-mounted display device in the related art; Fig.11 is a schematic diagram of the amplitude of the out-of-plane vibration of the vehicle-mounted display device in the related art; Fig.12 is a schematic diagram of the sound pressure level of noise of a vehicle-mounted display device proposed in one embodiment of the present application; Fig.13 It is a schematic diagram of the amplitude of an out-of-plane vibration of a vehicle-mounted display device proposed in one embodiment of the present application.

[0022] Explanation of the accompanying drawings: 10, display module; 11, display screen; 12, driving structure; 13, connecting block; 20, housing; 21, first part; 22, second part; 30, cavity; 31, first cavity; 32, second cavity; 40, isolation unit; 50, sound-permeable hole; 60, damping layer; 70, Helmholtz cavity; 80, piezoelectric sheet; X, first direction; Y, third direction; Z, second direction;. DETAILED DESCRIPTION

[0023] The following will be combined with the drawings in the embodiments of the present application to clearly and completely describe the technical solutions in the embodiments of the present application. Obviously, the described embodiments are part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of this application.

[0024] Reference Figure 1 and Figure 2 As shown, a vehicle-mounted display device disclosed in an embodiment of the present application includes a display module 10 and a housing 20 disposed on the backlight side of the display module 10 .

[0025] Specifically, refer to Figure 1 As shown, the display module 10 may include a display screen 11, a driving structure 12 and a connecting block 13. The display screen 11 is also a device used by the vehicle-mounted display device to display image content, and the display module 10 may also include a driving circuit used to drive the display screen 11 to perform luminous display. At the same time, the four sides of the display screen 11 are connected to the housing 20.

[0026] Reference Figure 1As shown, the driving structure 12 and the connecting block 13 are devices for driving the display screen 11 to generate tactile feedback. The driving structure 12 and the connecting block 13 are both arranged on the backlight side of the display screen 11, and the driving structure 12 is connected to the housing 20, and the connecting block 13 is connected to the display screen 11 and the driving structure 12 respectively. When the display screen 11 needs tactile feedback, the driving structure 12 will drive the connecting block 13 to vibrate in the horizontal direction, thereby driving the display screen 11 to vibrate. In actual products, the driving structure 12 can be a piezoelectric ceramic or a linear motor, etc.

[0027] However, in actual products, due to errors in the process and mechanical structure, the connecting block 13 will vibrate in both the horizontal and vertical directions under the action of the driving structure 12, causing the display screen 11 to vibrate out of the plane in the vertical direction and generate noise. At the same time, considering the need to leave movement space for movable parts such as the display screen 11, the connecting block 13 and the driving structure 12, at least one cavity 30 will be formed between the display module 10 and the housing 20; in addition, there are also threading holes on the housing 20 for leading out the power line and the data line, so that the display screen 11, the cavity 30 and the threading holes form a structure similar to a speaker, further amplifying the noise.

[0028] For this purpose, refer to Figure 2 As shown, in the embodiment of the present application, a plurality of isolation units 40 are disposed on the inner wall of the housing 20 facing the display module 10 , and the plurality of isolation units 40 are located in at least one cavity 30 .

[0029] Specifically, a plurality of isolation units 40 are arranged at intervals along the first direction X, and there is a gap between the isolation unit 40 and the inner side wall of the housing 20. The first direction X is parallel to the direction in which the driving structure 12 drives the connecting block 13 to vibrate. In the embodiment of the present application, the display module 10 is generally a rectangular body as a whole, and the first direction X is specifically the length direction of the display module 10. At the same time, the isolation unit 40 is generally a long strip as a whole, and the length direction (third direction Y) of the isolation unit 40 is perpendicular to the first direction X, that is, the isolation unit 40 extends along the width direction of the display module 10, and the two ends of the isolation unit 40 in the length direction may contact or not contact the inner side wall of the housing 20. Using a plurality of isolation units 40, a cavity 30 can be divided into a plurality of smaller chambers, and after the volume of the chamber is reduced, the noise generated by the resonance of the chamber will also be reduced. The size (X1 / X2) of the isolation unit 40 in the first direction X can be in the centimeter level. For example, the size of the isolation unit 40 in the first direction X can be 1cm, 2cm, 3cm, etc., and those skilled in the art can set it according to actual needs.

[0030] Moreover, the size (Z1 / Z2) of the isolation unit X in the second direction Z is smaller than the size of the cavity 30 in the second direction Z. In the embodiment of the present application, the second direction Z is parallel to the light emitting direction of the display module 10, and the second direction Z can also be understood as the thickness direction of the rectangular display module 10, so the second direction Z is perpendicular to the first direction X. When the driving structure 12 drives the connecting block 13 to drive the display screen 11 to vibrate, the connecting block 13 and the display screen 11 will also vibrate in the second direction Z. Therefore, by making the size of the isolation unit 40 in the second direction Z (i.e., the height of the isolation unit 40) smaller than the size of the cavity 30 in the second direction Z (i.e., the height of the cavity 40), the isolation unit 40 can be prevented from affecting the vibration of the connecting block 13 and the display screen 11 in the second direction Z.

[0031] In the embodiment of the present application, the size of the isolation unit 40 in the second direction Z is 0.95 to 0.99 times the size of the cavity 30 in the second direction Z. For example, when the size of the cavity 30 in the second direction Z is 10 mm, the size of the isolation unit 40 in the second direction Z may be 9.5 mm to 9.9 mm; when the size of the cavity 30 in the second direction Z is 5 mm, the size of the isolation unit 40 in the second direction Z may be 4.75 mm to 4.95 mm.

[0032] Reference Figure 2 As shown, in one embodiment, since the connection block 13 is protruding relative to the display screen 11, if the shell 20 wants to wrap the connection block 13, the shell 20 will also form a protruding part. In this way, a first cavity 31 is formed between the shell 20 and the display screen 11, and a second cavity 32 is formed between the shell 20 and the connection block 13. The first cavity 31 and the second cavity 32 are interconnected. At the same time, in this embodiment, a plurality of isolation units 40 are arranged on the inner wall of the shell 20 in the first cavity 31 and the second cavity 32. The first cavity 31 and the second cavity 32 can be divided into a plurality of smaller chambers by using these isolation units 40, thereby reducing the noise generated by the resonance of the first cavity 31 and the second cavity 32.

[0033] Reference Figure 2As shown, in one embodiment, the spacing between the isolation unit 40 and the inner side wall of the housing 20 is the same as the spacing (d1 / d2) between two adjacent isolation units 40. Specifically, the spacing between the isolation unit 40 and the inner side wall of the housing 20 refers to the distance between the isolation unit 40 closest to the inner side wall of the housing 0 among the multiple isolation units 402 and the inner side wall of the housing 20, and the distance refers to the distance in the first direction X; the inner side wall of the housing 20 refers to the portion of the housing 20 extending along the second direction Z; setting the spacing between the isolation unit 40 and the inner side wall of the housing 20 to the same distance as the spacing between two adjacent isolation units 40 can make the arrangement of the isolation units 40 more uniform, so that the volumes of the chambers separated by the multiple isolation units 40 are roughly the same, so that the noise can be better reduced.

[0034] In one embodiment, the spacing between two adjacent isolation units 40 can be one quarter of the wavelength of the noise to be absorbed. Specifically, the noise to be absorbed refers to the noise generated by the resonance of the cavity 30 in the embodiment of the present application. Since the attenuation of the sound wave of the noise is the largest at a distance of one quarter of the wavelength of the noise to be absorbed, the noise can be better absorbed by setting the spacing between two adjacent isolation units 40 to one quarter of the wavelength of the noise to be absorbed. Exemplarily, when the frequency of the noise to be absorbed is 200 Hz, the wavelength of the noise to be absorbed is approximately 1700 mm, so the spacing between two adjacent isolation units 40 is 425 mm. At the same time, the spacing between the isolation unit 40 and the inner side wall of the housing 20 is also 425 mm.

[0035] In one embodiment, the isolation unit 40 may be made of sound-absorbing cotton. The isolation unit 40 made of sound-absorbing cotton has a good sound-absorbing effect on noise with a frequency below 1000 Hz.

[0036] With the vehicle-mounted display device provided by the embodiment of the present application, the volume of the cavity 30 is reduced by using a plurality of isolation units 40 distributed in the cavity 30, thereby reducing the noise generated by the resonance of the cavity 30. In addition, when the display screen 11 and the connecting block 13 vibrate along the second direction Z, they will contact the isolation unit 40, so the out-of-plane vibration (i.e., the vibration of the display screen 11 in the second direction Z) can also be suppressed to a certain extent.

[0037] It is understandable that for vehicle display devices of different sizes, the size of the isolation unit 40 in the first direction X, the spacing between two adjacent isolation units 40, and the size of the isolation unit 40 in the second direction Z can be reasonably adjusted according to their size to maximize the suppression of noise generated by the resonance of the cavity 30.

[0038] Reference Figure 3As shown, in an optional implementation, the embodiment of the present application further provides a vehicle-mounted display device, in which a sound-permeable hole 50 is opened on the housing 20 between two adjacent isolation units 40 .

[0039] Specifically, only one sound-permeable hole 50 is provided between each two adjacent isolation units 40, the sound-permeable hole 50 penetrates the housing 20, and the position of the sound-permeable hole 50 is equal to the spacing between the isolation units 40 on both sides, that is, the sound-permeable hole 50 is located exactly in the middle position between the two adjacent isolation units 40. It can be understood that the middle position is not only limited to the middle position in the first direction X, but also limited to the middle position in the third direction Y perpendicular to the first direction X. Exemplarily, when the spacing between two adjacent isolation units 40 (in the first direction X) is 425 mm, the distance between the center of the sound-permeable hole 50 and the two isolation units 40 is 212.5 mm respectively.

[0040] Each cavity can be changed into a porous structure through the sound-permeable hole 50. The porous structure has a higher resonance frequency than the non-porous structure. Therefore, the resonance frequency of each cavity will avoid the vibration frequency of the driving structure 12, thereby suppressing the amplification of noise caused by the resonance of the cavity 30.

[0041] In one embodiment, the diameter (l1 / l2) of the sound-transmitting hole 50 is greater than or equal to 1.0 mm and less than or equal to 2.0 mm. For example, the diameter of the sound-transmitting hole 50 may be 1.0 mm, 1.2 mm, 1.4 mm, 1.6 mm, 1.8 mm, 2.0 mm, etc., and those skilled in the art may set it according to actual needs.

[0042] In one embodiment, the sound-permeable hole 50 may be filled with a sound-absorbing material, such as sound-absorbing cotton or a porous material, so as to further suppress the transmission of noise from the sound-permeable hole.

[0043] Reference Figure 4 As shown, in an optional implementation, the embodiment of the present application further provides a vehicle-mounted display device, in which the housing 20 includes a first part 21 and a plurality of second parts 22 , and the material of the second part 22 is different from that of the first part 21 .

[0044] Specifically, the first part 21 of the shell is a part made of the same material as in the related art, and the second part 22 is a part made of a material different from the first part 21, and the position of the second part 22 corresponds to the position of some of the isolation units 40 in the plurality of isolation units 40. That is to say, in this embodiment, the material of the shell 20 at the position where the some isolation units 40 are located is replaced. Exemplarily, the material of the first part 21 can be stainless steel, and the material of the second part 22 can be high-strength plastic, so that the density and Young's modulus of the second part 22 are different from those of the first part 21, so that for the chamber where the isolation unit 40 after the material is replaced is located, its resonance frequency is different from that of the chamber where the material is not replaced, thereby changing the structure of the cavity 30 and suppressing the amplification of noise by the resonance of the cavity 30.

[0045] In the implementation of the present application, the material of the housing 20 is replaced every two isolation units 40. For example, the material of the housing 20 at the positions of the second isolation unit 40, the fifth isolation unit 40 and the eighth isolation unit 40 from left to right in the first direction X is replaced in the embodiment of the present application. The size of the second portion 22 in the first direction X is the sum of the size of the corresponding isolation unit 40 in the first direction X and the spacing between two adjacent isolation units 40, that is, X1+d1 or X2+d2.

[0046] Reference Figure 5 As shown, in an optional implementation, the embodiment of the present application further provides a vehicle-mounted display device, in which a damping layer 60 is provided on the inner wall of the housing 20 .

[0047] Specifically, the orthographic projection of the damping layer 60 on the housing 20 does not overlap with the orthographic projection of the isolation unit 40 on the housing 20, that is, the damping layer 60 is located between two adjacent isolation units 40, and between the isolation unit 40 and the inner side wall of the housing 20, and the size of the damping layer 60 in the first direction X is the same as the spacing between two adjacent isolation units 40, and the size of the damping layer 60 in the second direction Z is smaller than the size of the isolation unit 40 in the second direction Z. The size of the damping layer 62 in the second direction Z is one quarter to one half of the size of the isolation unit 40 in the second direction Z, so as to ensure that the damping layer has a certain thickness and does not affect the sound insulation effect of the isolation unit 40. The material of the damping layer 60 can be plastic material or carbon fiber material, etc.

[0048] By providing the damping layer 60 , when the display screen 11 vibrates out of the plane, a portion of the noise generated can be transmitted to the inside of the housing 20 and then absorbed by the damping layer 60 , thereby effectively reducing the noise generated by the resonance of the cavity 30 .

[0049] Reference Figure 6As shown, in an optional implementation, the embodiment of the present application further provides a vehicle-mounted display device, in which a Helmholtz cavity 70 is provided on the inner wall of the housing 20 between two adjacent isolation units 40 .

[0050] Specifically, refer to Figure 7 and Figure 8 As shown, in the embodiment of the present application, the Helmholtz cavity 70 includes a structure 71, a first through hole 72 is opened in the central area of ​​the structure along the second direction, and the structure 71 includes four cavities 73, and the four cavities 73 are respectively connected to the first through hole 72 through the second through hole 74, wherein the diameter of the first through hole 72 is greater than the diameter of the second through hole 74. At the same time, the size of the entire Helmholtz cavity 70 in the first direction X is equal to the spacing between two adjacent isolation units 40.

[0051] When the noise generated by the vibration outside the display screen 11 is transmitted to the position of the housing 20, the noise will first enter the first through hole 72, and then enter each cavity 73 through each second through hole 74, and drive the air in each cavity 73 to vibrate. By reasonably adjusting the size of the Helmholtz cavity 70 so that the resonance frequency of the Helmholtz cavity 70 is the same as the frequency of the noise, the noise can be absorbed.

[0052] Specifically, the Helmholtz cavity 70 can absorb noise at the resonant frequency. The relationship between the resonant frequency and the size of the Helmholtz cavity 70 is: f=(1 / (2*π))*sqrt(c2*S / VL) Wherein, c is the speed of sound, which is generally 340 m / s at room temperature and pressure, S is the cross-sectional area of ​​the bottleneck of the Helmholtz cavity 70, and in this embodiment, the bottleneck is a circle with a diameter of r3, and the cross-sectional area S=1 / 4πr32; V is the volume of the resonant cavity, and in this embodiment, V=x6*y6*z6; L is the length of the bottleneck of the Helmholtz cavity 70, and in this embodiment, L=d-2* x6- r2; z5 is the total thickness of the Helmholtz cavity 70, and its value is half of the thickness z1 of the isolation unit 40. This value is to avoid the Helmholtz cavity 70 being too thick, affecting the sound absorption effect of the isolation unit 40, and at the same time avoid the Helmholtz cavity 70 being too small, resulting in an unclear sound absorption effect; the thickness of the Helmholtz cavity 70 is 0.5 mm, so the thickness z6 of the cavity 73 inside the Helmholtz cavity 70 is z5-0.5mm*2, this value is to ensure that the shell of the Helmholtz cavity 70 has sufficient hardness; the total width of the Helmholtz cavity 70, that is, d=d1=d2, is 1 / 4 of the wavelength of the noise to be absorbed, that is, 425mm. According to the above values, the resonant cavity volume V and the bottleneck length L of the Helmholtz cavity 70 can be reasonably set so that the Helmholtz cavity 70 can absorb noise with a frequency of 200Hz.

[0053] Reference Fig. 9 As shown, in an optional embodiment, the embodiment of the present application also provides a vehicle-mounted display device, in which a plurality of piezoelectric sheets 80 are arranged on the backlight side of the display module 10, and the piezoelectric sheets 80 are used to apply vibration to the display module 10 in a direction opposite to the out-of-plane vibration.

[0054] Specifically, the out-of-plane vibration is the vibration of the display module 10 in the second direction Z. On the one hand, the piezoelectric sheet 80 can detect the out-of-plane vibration of the display screen 11 and convert it into an electrical signal. In this process, the piezoelectric sheet 80 vibrates along with the display screen 11 and converts the vibration into an electrical signal, and the electrical signal waveform is stored in the memory; on the other hand, the piezoelectric sheet 80 can perform inversion processing on the stored electrical signal as an excitation signal of the piezoelectric sheet 80, so that the piezoelectric sheet 80 generates a vibration in the opposite direction to the out-of-plane vibration, thereby offsetting the out-of-plane vibration of the display screen 11 and reducing the noise generated by the out-of-plane vibration of the display screen 11.

[0055] The position of the piezoelectric sheet 80 is related to the vibration mode generated by the out-of-plane vibration. Specifically, when the driving structure 12 drives the display screen 11 to vibrate longitudinally at a driving frequency of 200 Hz, the display screen 11 has a certain vibration mode. At this time, the piezoelectric sheet 80 is located at the peak or trough of the vibration mode, so that the piezoelectric sheet 80 can play a role in offsetting the out-of-plane vibration.

[0056] Furthermore, since the lateral dimension of the piezoelectric sheet 80 is much larger than its thickness, the lateral vibration of the display screen 11 will not be affected when the piezoelectric sheet 80 vibrates.

[0057] In one embodiment, taking the display screen 11 with a length of 260 mm as an example: the display screen 11 has a thickness of 2 mm, and the cavity 30 has a height of 14 mm. An isolation unit 40 with a height of 14 mm and a width of 5 mm and made of melamine sponge is set in the cavity 30. The top of the isolation unit 40 is made of soft material, and the display screen 11 does not contact the isolation unit 40 when it is stationary.

[0058] The sound absorption rate of melamine sponge at a frequency of 200Hz is 0.4. Two piezoelectric sheets with a thickness of 0.5mm and a length of 10mm are attached to the back of the display screen 11. The piezoelectric sheet 80 is located at the peak and trough of the external vibration of the optimized front face, that is, at 80mm and 180mm. The driving structure 12 provides the display screen 11 with a lateral vibration with a frequency of 200Hz and an amplitude of 10μm.

[0059] contrast Fig.10 and Fig.12 , Fig.11 and Fig.13It can be seen that the noise sound pressure level is also large at the location where the out-of-plane vibration of the display screen 11 is large. The maximum out-of-plane amplitude is about 4μm before optimization, and about 2.5μm after optimization, which is reduced by about 1.5μm, resulting in a noise reduction of about 10-20dB.

[0060] It should be noted that in the above-mentioned vehicle-mounted display device provided in the embodiment of the present application, different schemes can be combined with each other. For example, while setting a sound-transmitting hole 50 between two adjacent isolation units 40, a piezoelectric sheet 80 is set on the back of the display screen 11; or, while replacing the material of the shell 20, a sound-transmitting hole 50 is set between two adjacent isolation units 40. In this way, through different combinations, the noise generated by the vehicle-mounted display device during the tactile feedback process can be better reduced, thereby improving the user experience.

[0061] It should be noted that the various embodiments in this specification are described in a progressive manner, and each embodiment focuses on the differences from other embodiments. The same or similar parts between the various embodiments can be referenced to each other.

[0062] It should also be noted that, in this article, the orientation or position relationship indicated by the terms "center", "up", "down", "left", "right", "vertical", "horizontal", "inside", "outside", etc. is based on the orientation or position relationship shown in the drawings, which is only for the convenience of describing the present application and simplifying the description, and does 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 cannot be understood as a limitation on the present application. In addition, relational terms such as "first" and "second" are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply that there is any such actual relationship or order between these entities or operations, nor can they be understood as indicating or implying relative importance. Moreover, the terms "include", "comprise" or any other variant thereof are intended to cover non-exclusive inclusion, so that a process, method, article or terminal device including a series of elements includes not only those elements, but also includes other elements not explicitly listed, or also includes elements inherent to such process, method, article or terminal device. Without more restrictions, an element defined by the phrase "comprising a ..." does not exclude the existence of other identical elements in the process, method, article or terminal device comprising the element.

[0063] The technical solution provided by the present application is described in detail above. The principle and implementation method of the present application are described in this article using specific examples. The description of the above embodiments is only used to help understand the present application, and the content of this specification should not be understood as limiting the present application. At the same time, for those of ordinary skill in the art, according to the present application, there will be different forms of changes in the specific implementation methods and application scopes. It is not necessary and impossible to list all the implementation methods here, and the obvious changes or modifications derived therefrom are still within the scope of protection of the present application.

Claims

1. A vehicle-mounted display device, characterized in that: include: A display module and a housing connected to a backlight side of the display module, wherein at least one cavity is formed between the display module and the housing; A plurality of isolation units are arranged on the inner wall of the housing facing the display module, and the plurality of isolation units are located in the at least one cavity; Wherein, a plurality of the isolation units are arranged at intervals along the first direction, and there is a gap between the isolation units and the inner side wall of the shell; the size of the isolation unit in the second direction is smaller than the size of the cavity in the second direction; The first direction is perpendicular to the second direction, and the second direction is parallel to the light emitting direction of the display module.

2. The vehicle-mounted display device according to claim 1, characterized in that: The display module includes a display screen, a driving structure and a connecting block, wherein the driving structure is connected to the display screen through the connecting block, and the driving structure is used to drive the connecting block to drive the display screen to vibrate in the first direction; A first cavity is formed between the display screen and the housing, and a second cavity is formed between the connecting block and the housing; A plurality of isolation units are disposed in the first cavity and the second cavity.

3. The vehicle-mounted display device according to claim 1, characterized in that: The distance between the isolation unit and the inner side wall of the shell is the same as the distance between two adjacent isolation units.

4. The vehicle-mounted display device according to claim 3, characterized in that: The distance between two adjacent isolation units is one quarter of the wavelength of the noise to be absorbed.

5. The vehicle-mounted display device according to claim 1, characterized in that: The size of the isolation unit in the second direction is 0.95 times to 0.99 times the size of the cavity in the second direction.

6. The vehicle-mounted display device according to any one of claims 1 to 5, characterized in that: A sound-permeable hole is provided on the shell at a position between two adjacent isolation units, and the distance between the sound-permeable hole and the isolation units on both sides is equal.

7. The vehicle-mounted display device according to claim 6, characterized in that: The diameter of the sound-permeable hole is greater than or equal to 1.0 mm and less than or equal to 2.0 mm.

8. The vehicle-mounted display device according to claim 6, characterized in that: The sound-permeable hole is filled with sound-absorbing material.

9. The vehicle-mounted display device according to any one of claims 1 to 5, characterized in that: The housing comprises a first portion and a plurality of second portions, wherein the material of the second portions is different from that of the first portions; The position of the second portion corresponds to the position of some of the isolation units among the plurality of isolation units.

10. The vehicle-mounted display device according to claim 9, characterized in that: The size of the second portion in the first direction is the sum of the size of the corresponding isolation unit in the first direction and the spacing between two adjacent isolation units.

11. The vehicle-mounted display device according to any one of claims 1 to 5, characterized in that: A damping layer is arranged on the inner wall of the shell, and the orthographic projection of the damping layer on the shell does not overlap with the orthographic projection of the isolation unit on the shell.

12. The vehicle-mounted display device according to any one of claims 1 to 5, characterized in that: A Helmholtz cavity is provided on the inner wall of the shell at a position between two adjacent isolation units; The size of the Helmholtz cavity in the first direction is equal to the distance between two adjacent isolation units.

13. The vehicle-mounted display device according to any one of claims 1 to 5, characterized in that: A plurality of piezoelectric sheets are arranged on the backlight side of the display module, and the piezoelectric sheets are used to apply vibrations in a direction opposite to the out-of-plane vibration direction to the display module; The out-of-plane vibration is the vibration of the display module in the second direction.

14. The vehicle-mounted display device according to claim 13, characterized in that: The piezoelectric piece is located at a peak or a trough of a vibration mode generated by the out-of-plane vibration.

15. The vehicle-mounted display device according to any one of claims 1 to 5, characterized in that: The isolation unit is configured to be in a strip shape, and a length direction of the strip-shaped isolation unit is perpendicular to both the first direction and the second direction.

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