CN115474135A

CN115474135A - Display device

Info

Publication number: CN115474135A
Application number: CN202110657399.0A
Authority: CN
Inventors: 王海盈
Original assignee: Hisense Visual Technology Co Ltd
Current assignee: Hisense Visual Technology Co Ltd
Priority date: 2021-06-11
Filing date: 2021-06-11
Publication date: 2022-12-13

Abstract

The invention provides a display device, which comprises a display screen, wherein the display screen comprises a display area and a non-display area, the display area is used for displaying images, and the non-display area is arranged outside the display area in a surrounding manner; the back plate is fixedly connected with the non-display area; the exciter comprises a vibrating piece, the vibrating piece is connected with the back plate, and the vibration of the vibrating piece can be transmitted to the back plate so as to drive the non-display area to vibrate and sound through the back plate. The display device provided by the invention can generate sound through vibration of the display screen.

Description

Display device

Technical Field

The invention relates to the technical field of display, in particular to a display device.

Background

With the development of science and technology and the improvement of the living standard of people, display devices such as liquid crystal televisions are increasingly applied to the work and the life of people.

The display device comprises a display screen, a diffusion film, a light guide plate and a reflecting plate, wherein the diffusion film, the light guide plate and the reflecting plate are stacked behind the display screen, and the backlight source can be arranged between the light guide plate and the reflecting plate so that light rays emitted by the backlight source are emitted out towards one side of the display screen. Wherein, in order to reduce the cost of manufacture, all adopt direct contact's mode to assemble between display screen, diffusion barrier, light guide plate and the reflecting plate, just also lead to display screen, diffusion barrier, light guide plate and the arbitrary adjacent air bed all to have between the two of reflecting plate.

The display device can not realize the vibration sounding of the display screen because the air layer can not transmit the vibration between the adjacent two.

Disclosure of Invention

In view of the above problems, embodiments of the present invention provide a display device that can generate sound by vibration of a display screen.

In order to achieve the above object, the embodiments of the present invention provide the following technical solutions:

the embodiment of the invention provides a display device, which comprises a display screen, wherein the display screen comprises a display area and a non-display area, the display area is used for displaying images, and the non-display area is arranged outside the display area in a surrounding manner; the back plate is fixedly connected with the non-display area; the exciter comprises a vibrating piece, the vibrating piece is connected with the back plate, and the vibration of the vibrating piece can be transmitted to the back plate so as to drive the non-display area to vibrate and sound through the back plate. Therefore, the exciter can drive the back plate to vibrate, and the vibration of the back plate is transmitted to the non-display area, so that the vibration sounding of the non-display area, namely the display screen is realized.

In some embodiments, the back plate comprises: the back plate body is fixedly connected with the non-display area; the vibration part is arranged at the position, corresponding to the non-display area, of the back plate and connected with the vibration piece, and the vibration part can deform under the vibration of the vibration piece and can move back and forth relative to the back plate body. Like this, the backplate comprises two parts, backplate body and non-display area fixed connection, and the connection stability between backplate and the display screen is higher, and vibration portion can take place to warp for the backplate body, and the exciter can be comparatively convenient drives vibration portion for backplate body reciprocating motion to drive the vibration of non-display area through vibration portion and take place.

In some embodiments, the back plate is provided with a strength reducing part which penetrates through the back plate along the vertical direction of the back plate; the parts of the back plate located at the two sides of the extending direction of the strength reducing part form a vibrating part. Wherein, the portion of reducing the strength portion runs through the backplate, and like this, the part intensity that is located the portion of reducing the strength portion extending direction both sides of backplate is lower, and has great deformability to help the exciter to drive the vibration of backplate body.

In some embodiments, the number of the strength reducing portions is two, the two strength reducing portions are arranged in parallel, and the parallel direction of the strength reducing portions is perpendicular to the extending direction of the strength reducing portions, wherein the portion of the back plate located between the two strength reducing portions constitutes the vibrating portion. Thus, by providing the reinforcement reducing portion, the strength of the back plate at the position where the exciter is provided can be reduced, i.e., the vibrating portion can be made to have a larger vibration amplitude.

In some embodiments, the width of the two ends of the vibration part is smaller than the width of the vibration part at other positions so as to increase the vibration amplitude of the vibration part and improve the sound pressure level of the sound emitted by the display screen.

In some embodiments, the backplate comprises a plurality of connecting portions arranged at intervals along the circumference of the vibrating portion, a first end of each connecting portion is connected with the vibrating portion, and a second end of each connecting portion is connected with the backplate body; the connecting part can be driven by the vibrating part to turn over by taking the second end as a fulcrum. Therefore, the vibration amplitude of the vibrating part relative to the back plate body can not be influenced by factors such as the thickness and the material of the back plate.

In some embodiments, the connecting portion is bent along the length direction of the connecting portion. Like this, the elasticity of connecting portion is great, and the relative movement takes place for the backplate body easily for the vibration portion to drive the vibration sound production of non-display area.

In some embodiments, the back plate body is provided with an avoiding notch, and the vibrating part is accommodated in the avoiding notch. Therefore, the vibrating part does not protrude out of the side wall surface of the back plate body, and the bonding stability between the back plate body and the non-display area is high.

In some embodiments, the exciter further comprises an exciter body, the vibrating member being connected to the exciter body and reciprocally movable relative to the exciter body; the exciter body is fixedly connected with the back plate body.

In some embodiments, the display device further includes a buffer member disposed between the vibrating portion and the non-display area and capable of being elastically deformed under the driving of the vibrating portion to prevent the non-display area from being cracked.

In some embodiments, the actuator is any one of an electromagnetic actuator, a magnetostrictive actuator, and a piezoelectric actuator, and the applicability is high.

In some embodiments, the number of exciters is multiple, and the multiple exciters are spaced along the circumference of the display screen, so that the multiple exciters can form a stereo system, and the user experience is wasted.

In some embodiments, the display device further comprises speakers, the speakers and the exciter being spaced circumferentially of the display screen.

In some embodiments, the display device further comprises a controller; the input end of the first filter is connected with the controller; the two ends of the amplitude limiter are respectively connected with the output end of the first filter and the input end of the exciter; the input end of the second filter is connected with the controller, and the output end of the second filter is connected with the loudspeaker; and the input end of the third filter is connected with the controller, and when the input signal of the exciter is greater than a preset value, the output end of the third filter is connected with the input end of the second filter.

In this way, the first filter and the second filter can make the superposed sound from the loudspeaker and the non-display area still have a relatively flat frequency response curve. Meanwhile, the third filter is arranged, so that the display device has a large dynamic range, and can have a relatively flat frequency response curve when the volume of the display device is increased.

In addition to the technical problems solved by the embodiments of the present invention, the technical features constituting the technical solutions, and the advantages brought by the technical features of the technical solutions described above, other technical problems that can be solved by the display device provided by the embodiments of the present invention, other technical features included in the technical solutions, and advantages brought by the technical features will be further described in detail in the detailed description.

Drawings

In order to more clearly illustrate the embodiments of the present invention or technical solutions in related arts, the drawings used in the description of the embodiments or related arts will be briefly introduced below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to these drawings without creative efforts.

Fig. 1 is a schematic structural diagram of a display device according to an embodiment of the present invention;

FIG. 2 is a schematic structural diagram of a display device with a plurality of actuators according to an embodiment of the present invention;

fig. 3 is a schematic structural diagram of a display device when a speaker and an exciter are simultaneously disposed according to an embodiment of the present invention;

FIG. 4 is a first schematic view of the structure of the back plate of FIG. 1;

FIG. 5 is a second schematic view of the structure of the back plate shown in FIG. 1;

FIG. 6 is a third schematic structural view of the back plate of FIG. 1;

FIG. 7 is a schematic view of the display panel of FIG. 1;

FIG. 8 is a schematic structural view of portion A of FIG. 1;

FIG. 9 is a first schematic view of the backplate of FIG. 6 when connected to an actuator;

FIG. 10 is a second schematic structural view of the backplate of FIG. 6 when connected to an actuator;

FIG. 11 is a first schematic view of the vibrating portion shown in FIG. 6;

FIG. 12 is a second schematic structural view of the vibrating portion in FIG. 6;

FIG. 13 is a third schematic structural view of the vibrating portion in FIG. 6;

FIG. 14 is a fourth schematic structural view of the vibrating portion of FIG. 6;

FIG. 15 is a system architecture diagram of the display device of FIG. 3;

FIG. 16 is a first schematic diagram of the first frequency response curve of the loudspeaker, the exciter, and the loudspeaker and the exciter in FIG. 3 after superposition;

FIG. 17 is a second schematic diagram of the speaker, the exciter, and the frequency response curve of the speaker and the exciter shown in FIG. 3 after being superimposed;

fig. 18 is a third schematic diagram of the frequency response curves of the loudspeaker, the exciter and the superposed loudspeaker and exciter in fig. 3.

Reference numerals:

10: a display screen; 11: a display area; 12: a non-display area;

20: a back plate; 21: a back plate body; 22: a vibrating section; 23: a strength reducing portion; 24: a connecting portion; 25: avoiding the notch;

30: an exciter; 31: a vibrating member; 32: an exciter body;

40: a buffer member;

50: a first adhesive member;

60: a rear housing;

70: a speaker;

80: a circuit board;

90: a display module;

x: the parallel directions; y: a direction of extension; z: and (4) vertical.

Detailed Description

In order to make the aforementioned objects, features and advantages of the embodiments of the present invention more comprehensible, embodiments of the present invention are described in detail below with reference to the accompanying drawings. It is to be understood that the described embodiments are merely a few embodiments of the invention, and not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

In the related art, the Display device includes a Liquid Crystal Display (LCD) Display device, an Organic Light-Emitting Diode (OLED) Display device, and the like.

In order to reduce the manufacturing cost of the LCD display device, the display screen, the diffusion film, the light guide plate and the reflection plate in the display device are assembled in a direct contact manner, so that an air layer is formed between any adjacent two of the display screen, the diffusion film, the light guide plate and the reflection plate. Since the air layer cannot transmit the vibration between the adjacent two, the LCD display device cannot realize the vibration sound production of the display screen, and only can produce the sound through the speaker. And the sound of the loudspeaker is relatively generated by the surface vibration, and the sound pressure level is smaller.

In view of this, the display device provided in the embodiments of the present application is provided with an exciter, the exciter is connected to a back plate of the display device, and the back plate is connected to a non-display area of the display screen, so that the exciter can drive the non-display area to vibrate and generate sound, and the sound of the display device can have a larger sound pressure level.

Fig. 1 is a schematic structural diagram of a display device according to an embodiment of the present invention. Fig. 2 is a schematic structural diagram of a display device when a plurality of actuators are provided according to an embodiment of the present invention. Fig. 3 is a schematic structural diagram of a display device when a speaker and an exciter are simultaneously disposed according to an embodiment of the present invention. Fig. 4 is a first structural diagram of the back plate in fig. 1. Fig. 5 is a schematic structural diagram of the back plate in fig. 1. Fig. 6 is a third schematic structural diagram of the back plate in fig. 1. Fig. 7 is a schematic structural diagram of the display screen in fig. 1. Fig. 8 is a schematic structural view of a portion a in fig. 1. Fig. 9 is a first structural diagram of the back plate in fig. 6 when connected with the exciter. Fig. 10 is a second schematic structural view of the back plate of fig. 6 connected to an exciter.

Referring to fig. 1 to 10, an embodiment of the present application provides a display device, which includes a display screen 10, where the display screen 10 includes a display area 11 and a non-display area 12; the display device comprises a back plate 20 and an exciter 30, wherein the exciter 30 comprises a vibrating piece 31, the vibrating piece 31 is connected with the back plate 20, and the vibration of the vibrating piece 31 can be transmitted to the back plate 20 so as to drive the non-display area 12 to vibrate and generate sound through the back plate 20.

Specifically, the display device further includes a rear case 60 and a display module 90, and the display module 90 includes a reflective sheet (not shown), a light guide plate (not shown), an optical film (not shown), and a light source (not shown) on one side of the rear plate 20.

The display device includes a day side, a left side, a right side, and a ground side, wherein the day side is opposite to the ground side, the left side is opposite to the right side, the day side is connected to one end of the left side and one end of the right side, respectively, and the ground side is connected to the other end of the left side and the other end of the right side, respectively. The display device further comprises a front side located at the side where the display screen 10 is located and a rear side located at the side where the rear cover 60 is located.

The display area 11 is used for displaying images, the non-display area 12 is arranged around the display area 11, and the back plate 20 is fixedly connected with the non-display area 12. Illustratively, the non-display area 12 is fixedly connected to the edge of the back plate 20 by the first adhesive member 50. The first adhesive member 50 may be foam, double-sided tape, or the like.

The light source is used for generating light, and the light source is positioned on the ground side of the display device. The light source is provided in the form of a light bar, the display device further comprises a circuit board 80 and a plurality of LED lamps positioned on the circuit board 80, and light emitted by the light source enters from one side.

The reflector plate is used for reflecting light rays to the light emitting direction, and light rays emitted by the light source are uniformly distributed. The reflective sheet is fixed to the surface of the back plate 20. The reflector plate has a white reflecting surface, and is made of PET.

The light guide plate comprises a light inlet side and a light outlet side, the light source is positioned on the light inlet side of the light guide plate, and light entering from the light inlet side is emitted out from the light outlet side of the light guide plate by utilizing the refraction and total reflection effects of the light guide plate, so that the linear light source is converted into a surface light source.

The reflector plate is positioned on one side opposite to the light emergent side of the light guide plate.

The light guide plate is made of glass, PMMA or PC.

The optical film is positioned on the light-emitting side of the light guide plate and used for brightening the light.

The optical film may include one or more films including at least one of a prism film, a brightness enhancement film.

The exciter 30 is used for driving the sounding part to vibrate and sound, and in some embodiments, the exciter 30 is any one of an electromagnetic exciter, a magnetostrictive exciter, and a piezoelectric exciter, which is highly applicable. The exciter 30 includes a vibrating member 31, wherein the vibrating member 31 may be a voice coil when the exciter 30 is an electromagnetic exciter, and the vibrating member 31 may be a magnetostrictive rod when the exciter 30 is a magnetostrictive exciter.

In some embodiments, the sound emitting member is a display screen 10. Wherein the non-display area 12 is connected to an edge of the rear plate 20. Thus, the vibrating member 31 and the back plate 20 can drive the back plate 20 to vibrate when the vibrating member 31 vibrates, and the vibration of the back plate 20 is transmitted to the non-display area 12, so that the non-display area 12 can be driven to vibrate and sound.

In some embodiments, the vibration member 31 is connected to an edge of the back plate 20, so that the vibration of the back plate 20 can be directly transmitted to the non-display region 12, and the transmission path of the vibration of the back plate 20 is small and the vibration energy loss is small.

In some embodiments, the material of the back plate 20 may be aluminum alloy, steel, etc. When the display screen 10 is small in size, the back plate 20 may be made of an aluminum alloy or steel with a small thickness. When the display screen 10 is large in size, the back plate 20 may be made of steel, and the thickness of the back plate 20 is large.

In some embodiments, the vibrating member 31 may also be indirectly connected to the back plate 20. Considering that the damping of the back plate 20 is small, the vibration member 31 and the back plate 20 can be provided with a damping member to increase the damping at the position where the vibration member 31 of the back plate 20 is connected, that is, to improve the damping of the non-display area 12, to expand the frequency range of the sound emitted from the non-display area 12, and to avoid the sound emitted from the non-display area 12 from generating obvious peaks and valleys and distortion to affect the listening feeling.

In some embodiments, the damping member may be a honeycomb sandwich panel, a foam sandwich panel, a wood sandwich panel, or an acrylic panel, which is low in cost and readily available. The damper may be a foamed material made of polyurethane or the like.

It will be appreciated that different materials of the backplate 20 and different thicknesses of the backplate 20 each have different Young's moduli, i.e., different materials of the backplate 20 and different thicknesses of the backplate 20 have different resistances to deformation. Then, the young's modulus of the back plate 20 can be reduced by reducing the thickness of the back plate 20 or using a material that is easily deformable, such as an aluminum alloy, to improve the deformability of the edge of the back plate 20.

In order to easily bring the edge of the back plate 20 to deform, in some embodiments, the back plate 20 includes a back plate body 21, and the back plate body 21 is fixedly connected to the non-display area 12; a vibration part 22, the vibration part 22 is arranged at the position corresponding to the non-display area 12 of the backboard 20, the vibration part 22 is connected with the vibration member 31, the vibration part 22 can be deformed under the vibration of the vibration member 31 and can move back and forth relative to the backboard body 21.

That is, the back plate 20 is composed of two parts, namely, a back plate body 21 and a vibrating part 22, the back plate body 21 is fixed to the non-display area 12 by the first adhesive 50, and the relative displacement between the back plate body 21 and the non-display area 12 is small. The vibrating portion 22 is not fixed to the non-display region 12, the young's modulus of the vibrating portion 22 is small, and the vibrating portion 22 has a large relative displacement amount to the non-display region 12. When the exciter 30 works, the vibrating portion 22 can reciprocate relative to the back plate body 21 along with the vibrating member 31, and the back plate body 21 does not deform, so that the back plate body 21 can still be stably connected with the non-display area 12.

In some embodiments, the relative movement between the vibrating portion 22 and the backplate body 21 may be achieved by the vibrating portion 22 itself being deformed. The back plate 20 is provided with a strength reducing part 23, and the strength reducing part 23 penetrates through the back plate 20 along the vertical direction of the back plate 20; the portions of the back plate 20 located on both sides in the extending direction of the strength reducing portion 23 constitute vibrating portions 22.

The number of the strength reducing portions 23 may be one, and the strength reducing portions 23 extend in different directions. Referring to fig. 4, when the strength reducing portion 23 extends along the edge of the back plate 20, the vibration portion 22 refers to a region surrounded by a dotted line in fig. 4. Referring to fig. 5, when the reinforcing portion 23 is disposed perpendicular to the edge of the back plate 20 along the extending direction, the portions of the back plate 20 located at two sides of the extending portion are defined by the dotted line in fig. 5, and the width of the area may be 2 times to 3 times the width of the reinforcing portion 23.

The number of the reinforcing portions 23 may be two, and the parallel direction X of the two reinforcing portions 23 is perpendicular to the extending direction Y of the reinforcing portions 23, wherein the portion of the back plate 20 between the two reinforcing portions 23 constitutes the vibrating portion 22. Thus, the whole vibrating portion 22 can have a large deformation amount, and when the vibrating member 31 vibrates, the vibrating portion 22 is deformed and protrudes from the sidewall of the back plate 20 under the driving of the vibrating member 31 to drive the non-display area 12 to vibrate and generate sound.

The parallel direction X and the extending direction Y may extend along two adjacent sides of the back plate 20, and the parallel direction X and the extending direction Y are perpendicular to the vertical direction Z. Exemplarily, fig. 11 is a first schematic structural diagram of the vibrating portion in fig. 6. Referring to fig. 6 and 11, the extending direction Y is the extending direction of the edge of the back plate 20.

It is understood that when the vibrating portion 22 is located between the two reinforcing portions 23, the vibrating portion 22 relatively moves with respect to the backplate body 21 by virtue of its deformation, and the amount of deformation of the vibrating portion 22 is smaller as it is closer to the end of the reinforcing portion 23. Therefore, the vibrating member 31 may be disposed at the middle of the vibrating portion 22 in the extending direction Y. In some embodiments, the distance between the vibration member 31 and one end of the strength reducing part 23 may be 0.2 to 0.8 times the extension length of the strength reducing part 23.

Here, the vibrating portion 22 may be a plate-shaped structure having an equal width. In order to facilitate the deformation of the vibrating portion 22 under the driving of the vibrating member 31, in some embodiments, when the vibrating portion 22 is located between the two strength-reducing portions 23, referring to fig. 6 and 11, the width of the two ends of the vibrating portion 22 along the parallel direction X is smaller than the width of the other positions of the vibrating portion 22 along the parallel direction X, that is, the size of the middle portion of the vibrating portion 22 is larger and the size of the two ends of the vibrating portion 22 is smaller.

In some embodiments, referring to fig. 9, the size of the vibration part 22 along the arrangement direction may be gradually changed, so that the strength of the vibration part 22 is high to prevent the vibration part 22 from being broken during the vibration process.

In some embodiments, referring to fig. 6, for the strength reducing portion 23, along the extending direction Y of the strength reducing portion 23, the strength reducing portion 23 may be a strip-shaped hole with a uniform width. Of course, referring to fig. 11, the width of the two ends of the strength reducing portion 23 may be greater than the width of the middle portion of the strength reducing portion 23, and the shape of the strength reducing portion 23 and the shape of the vibration portion 22 are not limited in this embodiment.

Fig. 12 is a second schematic structural diagram of the vibrating portion in fig. 6. Fig. 13 is a third schematic structural view of the vibrating portion in fig. 6. Fig. 14 is a fourth schematic structural view of the vibrating portion in fig. 6.

Referring to fig. 12 to 14, in some embodiments, an elastic connection structure may be disposed between the vibrating portion 22 and the back plate body 21, and the vibrating portion 22 and the back plate body 21 move relative to each other by the expansion and contraction of the elastic connection structure. Specifically, the back plate 20 includes a plurality of connecting portions 24, the connecting portions 24 are arranged at intervals along the circumferential direction of the vibrating portion 22, a first end of each connecting portion 24 is connected to the vibrating portion 22, and a second end of each connecting portion 24 is connected to the back plate body 21; the connecting portion 24 can be turned over with the second end as a pivot under the driving of the vibrating portion 22.

Wherein the connecting portion 24 may have a different structure. In some embodiments, the connection 24 may be a spring or the like. In this way, the vibration member 31 can move the vibration part 22 back and forth toward or away from the display screen 10 by the back and forth expansion deformation of the connection part 24.

In some embodiments, the connecting portion 24 may be a strip-shaped structural member to achieve the relative movement between the vibrating portion 22 and the backplate body 21 through bending deformation of the connecting portion. At this time, referring to fig. 6, the extending direction of the connecting portion 24 may be parallel to the extending direction of the vibrating portion 22.

Referring to fig. 12-14, in some embodiments, the connecting portion 24 is bent along its length. Thus, the connecting portion 24 is easily deformed, and the vibration amplitude of the vibrating member 31 can be effectively transmitted to the vibrating portion 22, thereby avoiding the loss of the vibration energy of the vibrating member 31.

The vibrating portion 22 and the back plate body 21 may be two independent components, and the vibrating portion 22 is disposed on a side of the back plate body 21 facing the display screen 10. In some embodiments, referring to fig. 12 to 14, an avoiding gap 25 is formed on the back plate body 21, and the vibrating portion 22 and the connecting portions 24 are accommodated in the avoiding gap 25.

Thus, when the back plate body 21 and the non-display area 12 are bonded and fixed by the first bonding member 50, the situation that the back plate body 21 and the non-display area 12 are separated from each other and are not firmly bonded due to the fact that the vibration part 22 or the connecting part 24 protrudes out of the back plate body 21 is avoided.

In some embodiments, the vibrating portion 22 and the connecting portion 24 may be integrally formed with the backplate body 21. For example, referring to fig. 12 to 14, the vibrating portion 22 and the connecting portion 24 may be formed by punching holes on the backplate 20, and the side wall surfaces of the vibrating portion 22 and the connecting portion 24 are located on the same plane as the side wall surface of the backplate body 21.

The exciter 30 further includes an exciter body 32, and the vibration member 31 is connected to the exciter body 32 and reciprocally movable with respect to the exciter body 32; the exciter body 32 may be connected to the vibration part 22, and the vibration part 22 is driven to vibrate by the weight of the exciter body 32. In this way, the equivalent weight and the equivalent density of the vibration portion 22 are increased, which helps the vibration portion 22 to excite low-frequency sound, and meets the design requirement of the display device for low-frequency sound.

In some embodiments, the exciter body 32 is fixedly connected to the backplate body 21, for example, the exciter body 32 may be fixedly connected to the backplate body 21 by screwing, riveting, bonding, or the like. Thus, the actuator body 32 is fixed relative to the backplate body 21. When the exciter 30 works, the vibration member 31 can extend and contract relative to the exciter body 32, and drives the vibration part 22 to reciprocate.

In some embodiments, the display device further includes a buffer 40 having elasticity, and the buffer 40 is disposed between the vibration part 22 and the non-display area 12.

The buffer member 40 may be fixedly connected to at least one of the vibration part 22 and the non-display region 12. In some embodiments, the buffer member 40 may be fixedly connected to the vibration portion 22 and the non-display region 12, so as to avoid collision noise among the vibration portion 22, the buffer member 40, and the non-display region 12 during the vibration of the vibration portion 22.

The buffer member 40 may be made of rubber, silicon, or other materials, and is fixedly connected to the vibrating portion 22 and the non-display area 12 through a second adhesive member. Of course, the buffer member 40 itself may be a member having viscosity such as foam or double-sided tape to absorb the impact applied to the non-display area 12.

In some embodiments, the buffer member 40 may have a greater rigidity, and for example, the rigidity of the buffer member 40 is greater than that of the first adhesive member 50, so that the vibration amplitude of the vibration portion 22 can be effectively transmitted to the non-display area 12, and the loss amount of the vibration energy of the vibration member 22 at the buffer member 40 is reduced, so that the sound emitted from the non-display area 12 has a predetermined sound pressure level. Meanwhile, the first adhesive 50 has a relatively low rigidity, and in the vibration process of the non-display area 12, the non-display area 12 and the back plate body 21 can be allowed to move relatively, so that the shearing deformation between the two parts of the non-display area 12 corresponding to the buffer 40 and the first adhesive 50 is avoided.

In some embodiments, the number of actuators 30 is multiple, and the multiple actuators 30 are spaced apart along the circumference of the display screen 10. In this way, multiple exciters 30 may form a stereo system, optimizing the user experience.

It will be appreciated that the human body is less sensitive to the perception of the sound image of the sound produced by the face vibration. Therefore, the plurality of actuators 30 may be disposed at any position in the circumferential direction of the display screen 10, and the center of the sound image perceived by the user is approximately at the center position of the display screen 10.

In some embodiments, when the width of the non-display area 12 is large, for example, 20mm to 30mm, the non-display area 12 may have a large vibration amplitude, and the sound quality of the sound emitted from the non-display area 12 is good.

When the width of the non-display area 12 is small, for example, 3mm to 5mm, the non-display area 12 vibrates with a small amplitude, the sound pressure level of the sound emitted from the non-display area 12 is small, and the bass effect is poor. In some embodiments, the display device further comprises speakers 70, the speakers 70 and the exciter 30 being spaced circumferentially about the display screen 10. Thus, by using the speaker 70 in cooperation with the exciter 30, the sound emitted from the speaker 70 and the sound emitted from the non-display area 12 can be superimposed, and the superimposed sound has a large sound pressure level in a low frequency band.

Fig. 15 is a system architecture diagram of the display device of fig. 3. Fig. 16 is a first schematic diagram of the frequency response curves of the loudspeaker, the exciter and the superposed loudspeaker and exciter in fig. 3. Fig. 17 is a second schematic diagram of the frequency response curves of the loudspeaker, the exciter and the superposed loudspeaker and exciter in fig. 3. Fig. 18 is a third schematic diagram of the frequency response curves of the loudspeaker, the exciter and the superposed loudspeaker and exciter in fig. 3.

Referring to fig. 15 to 18, the display device further includes a controller; the input end of the first filter is connected with the controller; the two ends of the amplitude limiter are respectively connected with the output end of the first filter and the input end of the exciter 30; a second filter, an input terminal of which is connected to the controller, and an output terminal of which is connected to the speaker 70; and the input end of the third filter is connected with the controller, and when the input signal of the exciter 30 is greater than the preset value, the output end of the third filter is connected with the input end of the second filter.

Wherein, curve B ₁ A frequency response curve of the sound emitted from the non-display area 12, curve C ₁ Giving the speaker 70 a frequency response curve of the sound. Considering that the speaker 70 can emit sound in the full frequency band, the sound volume of the high frequency band emitted from the non-display area 12 is larger, for example, the sound volume of the frequency band larger than 1000Hz shown in fig. 17, and the sound volume of the low frequency band smaller than 1000Hz is smaller. In some embodiments, in order to make the superimposed sound have a relatively flat frequency response curve, the frequency band of the sound emitted from the speaker 70 greater than 1000Hz may be attenuated by the second filter, and the frequency band of the sound emitted from the non-display area 12 less than 1000Hz may be attenuated by the first filter, so that the superimposed sound of the sound emitted from the speaker 70 and the sound emitted from the non-display area 12 may have a relatively flat curve D ₁ A flat frequency response curve is shown.

Considering that the exciter 30 vibrates the non-display area 12 to generate sound through the vibration part 22, when the vibration amplitude of the vibration part 22 is large, the non-display area 12 may be broken. The output of the first filter is therefore connected to a limiter to limit the maximum output voltage of the control signal of the exciter 30.

In some embodiments, the driver 30 control signal output from the limiter may also be output to the driver 30 after passing through the first amplifier. The control signal output from the second filter may also be output to the speaker 70 after passing through the second amplifier.

Thus, in the frequency band of the superimposed sound greater than 1000Hz, the sound emitted from the non-display area 12 has a larger proportion than the sound emitted from the speaker 70. In the frequency band of the superimposed sound smaller than 1000Hz, the sound emitted from the speaker 70 has a large proportion with respect to the sound emitted from the non-display area 12.

In some embodiments, the dynamic range of the speaker 70 is different from that of the exciter 30. Illustratively, referring to fig. 17 and 18, curve B occurs when the input signal increases ₂ And B ₃ For 12 hairs in the non-display areaSchematic change diagram of frequency response curve of sound, curve C ₂ And C ₃ A schematic diagram of the variation of the frequency response curve of the sound emitted by the speaker 70. That is, when the input signal increases, the amount of change in the volume of the sound emitted from the speaker 70 is approximately twice the amount of change in the volume of the sound emitted from the non-display area 12.

Whereas the sound emitted from the speaker 70 is greater in proportion to the sound emitted from the non-display area 12 at a low frequency band lower than 1000Hz, and the sound emitted from the non-display area 12 is greater in proportion to the sound emitted from the speaker 70 at a high frequency band higher than 1000 Hz. This results in a small change in the sound of the high frequency band and a large change in the sound of the low frequency band after the volume has been increased, as shown by curve D ₂ As shown, the volume of the superimposed high-frequency band sound is lower than that of the low-frequency band sound, and the clarity of the superimposed sound is poor.

Therefore, when the display device has a large volume, the high frequency band of the sound emitted from the speaker 70 can be compensated by the third filter so that the superimposed sound can still have the curve D as it is ₃ A flatter frequency response curve is shown.

In some embodiments, a detector may be provided at an input or an output of the third filter, and the detector is configured to detect the strength of the input signal of the exciter 30, and when the strength of the input signal of the exciter 30 is greater than a preset value, the detector may communicate the output of the third filter and the input of the second filter to compensate the loudspeaker 70. When the intensity of the input signal detected by the detecting element is smaller than the preset value, the detecting element can disconnect the output end of the third filter and the input end of the second filter.

In some embodiments, it is considered that the sound pressure level of the sound emitted from the non-display area 12 has an upper limit value, and is smaller than the sound pressure level of the sound emitted from the speaker 70. The preset value may be a plurality of preset values, for example, a first preset value and a second preset value, wherein when the intensity of the input signal of the exciter 30 is the first preset value, the sound pressure level of the sound emitted from the non-display area 12 is an upper limit value. Then, when the intensity of the input signal of the exciter 30 is a first preset value, the speaker 70 has a first compensation amount, and when the intensity of the input signal of the exciter 30 is a second preset value, the speaker 70 has a second compensation amount, and the first compensation amount is smaller than the second compensation amount.

In some embodiments, the preset value is dynamically changed, and is related to the strength of the input signal of the exciter 30, and the like, and the present embodiment is not limited thereto.

As can be seen from the above embodiment, in the low frequency band of the superimposed sound lower than 1000Hz, the sound emitted from the speaker 70 is large in proportion to the sound emitted from the non-display area 12. And the human body is less sensitive to the sound image perception of sounds in frequency bands smaller than 1000 Hz. Therefore, the speaker 70 may be disposed at any position in the circumferential direction of the display screen 10. In some embodiments, the number of the speakers 70 may be plural, and is disposed on the ground side of the display screen 10.

Since the human body is less sensitive to the perception of sound images by the sound produced by the face vibration, in some embodiments, the exciter 30 may be disposed at any position along the circumference of the display screen 10.

In some embodiments, referring to fig. 3, a driver 30 may be disposed in the middle of the display screen 10 on the day side, and may act as a center speaker 70, which is decoded by a decoder to emit a spoken voice. The left and right sides of the display screen 10 may be provided with an exciter 30, respectively, to widen the sound field range of the superimposed sound and increase the stereoscopic impression of the sound.

In the present specification, each embodiment or implementation mode is described in a progressive manner, and the emphasis of each embodiment is on the difference from other embodiments, and the same and similar parts between the embodiments may be referred to each other.

In the description of the present specification, reference to the description of the terms "one embodiment", "some embodiments", "an illustrative embodiment", "an example", "a specific example", or "some examples", etc., means that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the present invention. In this specification, schematic representations of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.

Finally, it should be noted that: the above embodiments are only used to illustrate the technical solution of the present invention, and not to limit the same; while the invention has been described in detail and with reference to the foregoing embodiments, it will be understood by those skilled in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some or all of the technical features may be equivalently replaced; and the modifications or the substitutions do not make the essence of the corresponding technical solutions depart from the scope of the technical solutions of the embodiments of the present invention.

Claims

1. A display device, comprising:

the display screen comprises a display area and a non-display area, wherein the display area is used for displaying images, and the non-display area is arranged outside the display area in an enclosing manner;

the back plate is fixedly connected with the non-display area;

the exciter comprises a vibrating piece, the vibrating piece is connected with the back plate, and the vibration of the vibrating piece can be transmitted to the back plate so as to drive the non-display area to vibrate and sound through the back plate.

2. The display device according to claim 1, wherein the back plate comprises:

the back plate body is fixedly connected with the non-display area;

the vibration part is arranged at the position, corresponding to the non-display area, of the back plate, the vibration part is connected with the vibration piece, and the vibration part can deform under the vibration of the vibration piece and move back and forth relative to the back plate body.

3. The display device according to claim 2, wherein the back plate is provided with a strength-reduced portion, and the strength-reduced portion penetrates through the back plate along a vertical direction of the back plate;

the portions of the back plate located on both sides in the extending direction of the strength reducing portion constitute the vibrating portion.

4. The display device according to claim 3,

the number of the strength reducing parts is two, two the strength reducing parts are arranged in parallel, the parallel direction of the strength reducing parts is perpendicular to the extending direction of the strength reducing parts, wherein the back plate is located in two parts between the strength reducing parts to form the vibration part.

5. The display device according to claim 2, wherein the back plate includes a plurality of connecting portions, the plurality of connecting portions are arranged at intervals along a circumferential direction of the vibrating portion, a first end of each connecting portion is connected to the vibrating portion, and a second end of each connecting portion is connected to the back plate body;

the connecting part can be driven by the vibrating part to turn over by taking the second end as a fulcrum.

6. The display device according to claim 5, wherein the connecting portion is bent along a length direction thereof.

7. The display device according to claim 5, wherein an avoidance notch is formed in the back plate body, and the vibration portion and the plurality of connecting portions are accommodated in the avoidance notch.

8. The display device according to any one of claims 2 to 7, wherein the actuator further comprises an actuator body, and the vibrating member is connected to the actuator body and reciprocally movable with respect to the actuator body;

the exciter body is fixedly connected with the back plate body.

9. The display device according to any one of claims 2 to 7, further comprising a buffer member disposed between the vibrating portion and the non-display region and elastically deformable by the vibrating portion.

10. The display device according to any one of claims 1 to 7, wherein the number of the actuators is plural, and the plural actuators are provided at intervals in a circumferential direction of the display screen.