CN111918168B

CN111918168B - Sound production screen and display device

Info

Publication number: CN111918168B
Application number: CN202010596876.2A
Authority: CN
Inventors: 魏青云; 刘全宝
Original assignee: Hefei Visionox Technology Co Ltd
Current assignee: Hefei Visionox Technology Co Ltd
Priority date: 2020-06-28
Filing date: 2020-06-28
Publication date: 2022-06-17
Anticipated expiration: 2040-06-28
Also published as: CN111918168A

Abstract

The invention discloses a sound production screen and a display device, wherein the sound production screen comprises a screen body and an exciter arranged on one side of the screen body, a sound wave refraction layer and a sound wave reflection layer are sequentially stacked on the surface of one side, far away from the exciter, of the screen body, the sound wave refraction layer comprises a plurality of convex blocks with arc outer surfaces, the convex blocks are used for refracting sound waves generated by vibration to the sound wave reflection layer in the same direction, and an included angle between the reflection surface of the sound wave reflection layer and the screen body is an acute angle. According to the invention, the sound wave refraction layer and the sound wave reflection layer are arranged above the screen, the sound wave generated by screen vibration is refracted to the sound wave reflection layer in the same direction through the sound wave refraction layer, and then the sound wave is reflected to a specific position through the sound wave reflection layer, so that the propagation direction of the sound wave can be changed, the screen can sound at the specific position, directional sound production is realized, and the privacy of listening to voice or conversation of a user is greatly improved.

Description

Sound production screen and display device

Technical Field

The invention belongs to the technical field of screen sounding, and particularly relates to a sounding screen and a display device.

Background

Based on the design requirements of a full-screen mobile phone and appearance imperforate, the prior art provides a screen sounding technology for generating sound by using screen vibration so as to replace the traditional technology for generating sound by opening a receiver on the mobile phone. The screen sounding technology can omit the occupied space of a receiver on a display screen, and becomes a research hotspot for realizing full-screen display at present. As shown in fig. 1, the screen sound production principle is that a front display screen 2 and a structure are driven by an exciter 1, the display screen is used as a screen body, sound waves 3 are generated by vibration, and then the sound waves are transmitted to human ears. But the current screen sounding has the problem of poor privacy.

Disclosure of Invention

The invention aims to provide a sound production screen and a display device, which improve the privacy of screen sound production.

In a first aspect, an embodiment of the present invention provides a sound screen, including a screen body and an exciter disposed on one side of the screen body, where: the screen body is kept away from one side surface of exciter stacks gradually and is provided with sound wave refraction layer and sound wave reflection stratum, sound wave refraction layer is including a plurality of lugs that have the circular arc surface, the lug is used for refracting extremely with the equidirectional sound wave that the vibration produced sound wave reflection stratum, the plane of reflection of sound wave reflection stratum with contained angle between the screen body is the acute angle.

According to one aspect of the embodiments of the present invention, the bump is a hollow hemisphere.

According to an aspect of the embodiments of the present invention, the hollow hemisphere includes an inner surface and an outer surface, and a labyrinth acoustic structure is provided between the inner surface and the outer surface of the hollow hemisphere, the labyrinth acoustic structure includes an acoustic wave transmission channel and an acoustic wave blocking channel, and the acoustic waves are refracted to the acoustic wave reflection layer along the acoustic wave transmission channel in the same direction.

According to an aspect of the embodiment of the present invention, the acoustic transmission channel is bent a plurality of times in the labyrinth acoustic structure to form a passage, and the number of times of bending of the acoustic transmission channel is greater than 5 times and less than 10 times.

According to an aspect of the embodiment of the invention, the adjacent hollow hemispheres are tangent to each other.

According to an aspect of the embodiment of the present invention, a side of the acoustic wave reflection layer away from the screen body is provided with an acoustic wave absorption layer, and the acoustic wave absorption layer is configured to absorb an acoustic wave refracted from the acoustic wave reflection layer.

According to an aspect of the embodiment of the present invention, a side of the acoustic wave absorption layer away from the screen body is provided with a flat layer.

According to one aspect of the embodiment of the invention, the material of the acoustic wave refraction layer is a super surface material.

According to an aspect of the embodiment of the present invention, an included angle between the reflection surface of the acoustic wave reflection layer and the screen body is greater than 0 degree and less than or equal to 0.01 degree.

In a second aspect, embodiments of the present invention provide a display device, including a sound screen as described in any one of the first aspect.

According to the invention, the sound wave refraction layer and the sound wave reflection layer are arranged above the screen, the sound wave generated by screen vibration is refracted to the sound wave reflection layer in the same direction through the sound wave refraction layer, and then the sound wave is reflected to a specific position through the sound wave reflection layer, so that the propagation direction of the sound wave can be changed, the screen can sound at the specific position, directional sound production is realized, and the privacy of listening to voice or conversation of a user is greatly improved.

Drawings

Other features, objects and advantages of the invention will become apparent from the following detailed description of non-limiting embodiments thereof, when read in conjunction with the accompanying drawings, in which like reference characters designate the same or similar parts throughout the figures thereof, and which are not to scale.

FIG. 1 is a schematic diagram of a prior art screen shot;

FIG. 2 is a cross-sectional view of a sound screen of an embodiment of the present invention;

FIG. 3 is a top view of a sound screen of an embodiment of the present invention;

FIG. 4 is a schematic structural diagram of a sound wave labyrinth structure according to an embodiment of the present invention;

fig. 5 is a cross-sectional view of a bump according to an embodiment of the invention.

Detailed Description

Features and exemplary embodiments of various aspects of the present invention will be described in detail below, and in order to make objects, technical solutions and advantages of the present invention more apparent, the present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not to be construed as limiting the invention. It will be apparent to one skilled in the art that the present invention may be practiced without some of these specific details. The following description of the embodiments is merely intended to provide a better understanding of the present invention by illustrating examples of the present invention.

It is noted that, herein, relational terms such as first and second, and the like may be used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Also, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising … …" does not exclude the presence of other identical elements in a process, method, article, or apparatus that comprises the element.

It will be understood that when a layer, region or layer is referred to as being "on" or "over" another layer, region or layer in describing the structure of the component, it can be directly on the other layer, region or layer or intervening layers or regions may also be present. Also, if the component is turned over, one layer or region may be "under" or "beneath" another layer or region.

Fig. 1 shows the prior art in the technical field of the present invention, the sound screen includes an exciter 1 and a vibration plate 2, wherein the vibration plate 2 may be a display screen, and a vibration sound wave 3 of the exciter 1 can be transmitted to the vibration plate 2 through direct contact between the exciter 1 and the vibration plate or indirect contact through other transmission components, so as to drive the vibration plate 2 to vibrate, so that the sound wave 3 is transmitted from the vibration plate 2 to a side of the vibration plate 2 away from the exciter 1. But because sound wave 3 distributes on monoblock vibrating plate 2 this moment for monoblock face can be to each direction conduction sound, leads to partial sound wave 3 can be conducted to the people outside the user, makes screen sound production lack privacy and security.

The sound production screen comprises a screen body and an exciter arranged on one side of the screen body, wherein a sound wave refraction layer and a sound wave reflection layer are sequentially stacked on the surface, far away from the exciter, of one side of the screen body, the sound wave refraction layer comprises a plurality of convex blocks with arc outer surfaces, the convex blocks are used for refracting sound waves generated by vibration to the sound wave reflection layer in the same direction, and an included angle between the reflection surface of the sound wave reflection layer and the screen body is an acute angle. According to the invention, the sound wave refraction layer and the sound wave reflection layer are arranged above the screen, the sound wave generated by screen vibration is refracted to the sound wave reflection layer in the same direction through the sound wave refraction layer, and then the sound wave is reflected to a specific position through the sound wave reflection layer, so that the propagation direction of the sound wave can be changed, the screen can sound at the specific position, directional sound production is realized, and the privacy of listening to voice or conversation of a user is greatly improved.

The following describes the details of the sound screen in this embodiment, and the following is only provided for easy understanding and is not necessary to implement this embodiment.

As shown in fig. 2 and 3, the sound screen includes a screen body 10 and an exciter 20 disposed on one side of the screen body 10, a sound wave refracting layer 31 and a sound wave reflecting layer 32 are sequentially stacked on a surface of the screen body 10 on a side away from the exciter 20, the sound wave refracting layer 31 includes a plurality of protrusions 311 having an arc outer surface, sound waves generated by vibration are refracted to the sound wave reflecting layer 32 in the same direction through the protrusions 311, a reflection surface of the sound wave reflecting layer 32, i.e., a surface of the sound wave reflecting layer on a side close to the screen body 10, and an included angle with the screen body 10 is an acute angle, wherein a sound wave propagation direction is as shown in fig. 2, and an arrow indicates a propagation direction of the sound waves.

According to the sound production screen that this embodiment provided, the sound wave that exciter 20 produced passes through the screen body 10 and conducts to sound wave refraction layer 31, the lug 311 that has the circular arc surface on sound wave refraction layer 31 can refract the sound wave that screen vibration produced to sound wave reflection layer 32 with the equidirectional refraction, because the contained angle between sound wave reflection layer 32 and the screen body 10 is the acute angle, and then sound wave reflection layer 32 can reflect the sound wave to specific position when sound wave reachs sound wave reflection layer 32, for example, reflect to the position that the people's ear corresponds, thereby the propagation direction of sound wave has been changed, make the sound production screen can sound at specific position, thereby realize directional sound production, the privacy that the user listened pronunciation or conversation has been improved greatly.

Fig. 5 is a schematic structural diagram of a bump of an acoustic wave refraction layer according to an embodiment of the invention. As shown in fig. 5, as an achievable manner, the bump 311 on the circular arc outer surface of the acoustic wave refraction layer 31 is a hollow hemisphere, that is, the inside of the bump 311 is a hollow structure, and since air is a poor conductor of acoustic waves, acoustic waves are conducted and attenuated faster in air than in a solid, so that the energy of acoustic waves can be weakened by the internal hollow structure of the bump 311, thereby avoiding that the sound generated after being converged at a specific position is too loud due to too loud acoustic wave energy, and affecting the user experience.

Further, the bump 311 includes an inner surface 312 and an outer surface 313, a solid portion 315 of the bump is located between the inner surface 312 and the outer surface 313, a side of the inner surface 312 close to the screen body is a hollow portion of the bump 311, the solid portion 315 of the bump has a labyrinth acoustic structure, as shown in fig. 4, an arrow indicates a sound wave transmission direction, the labyrinth acoustic structure includes a sound wave transmission channel 316 and a sound wave blocking channel 317, the sound wave blocking channel 317 surrounds the sound wave transmission channel 316, and the sound wave transmission channel 316 forms a multiple-bending path in the labyrinth acoustic structure. The material in the acoustic transmission channel 316 can allow the sound wave to pass through, and is free space, the path of the acoustic transmission channel 316 is the channel for the sound wave to transmit in the acoustic labyrinth unit, the material of the acoustic blocking channel 317 does not allow the sound wave to pass through, and the sound wave can propagate out in a specific direction at a specific position along the acoustic transmission channel 316 in the acoustic labyrinth structure. In one bump 311, a plurality of labyrinth acoustic structures may be disposed, so that the sound waves propagating in different directions can adjust the propagation direction in the labyrinth acoustic structures, and finally refract to the sound wave reflection layer 32 in the same direction.

Optionally, the number of bends in the labyrinth acoustic structure, that is, the number of bends of the acoustic transmission channel 316, is defined as a channel number n, and the channel number of the labyrinth acoustic structure is 5 < n < 10, so that the directions of acoustic waves entering the labyrinth acoustic structure are deflected for multiple times, and the directions of the refracted acoustic waves are consistent; preferably, the number of the channels of the labyrinth acoustic structure is 7, so that the phenomenon that the sound waves are refracted to the sound wave reflecting layer 32 for too long time due to too much bending, and the sound emission of the screen has hysteresis can be avoided under the condition that the directions of the sound waves refracted out can be consistent. Further, when the path length of the labyrinth acoustic structure, that is, the path length of the acoustic wave transmission channel 316 is equal to an integral multiple of the half wavelength of the acoustic wave, the transmission amplitude of the acoustic wave is maximum.

Optionally, the height of the bump 311, that is, the distance from the outer surface 313 of the bump 311 to the screen body 10 is 0.3mm, and the thickness of the solid portion 315 of the bump 311 is greater than 0 and less than or equal to 0.2mm, so that on one hand, the display effect of the screen body 10 is not affected, and on the other hand, the bump 311 is not broken due to vibration of the screen body 10, and the sound production effect of the sound production screen is not affected.

Furthermore, the adjacent hollow hemispherical convex blocks 311 are tangent to each other, that is, there is no gap between the adjacent convex blocks 311, and the acoustic wave refraction layer 31 formed by all the convex blocks 311 covers the whole screen body 10, so as to avoid that the acoustic wave propagates to the acoustic wave reflection layer 32 without being refracted by the convex blocks 311, thereby preventing part of the acoustic wave with inconsistent direction from propagating to a specific position.

A second embodiment of the present invention relates to a sound screen, and a schematic configuration of the sound screen in this embodiment is as shown in fig. 2, and the second embodiment is substantially the same as the first embodiment except that a sound wave absorbing layer 33 is provided on a side of a sound wave reflecting layer 32 away from a screen body, and the sound wave absorbing layer 33 can absorb a sound wave refracted from the sound wave reflecting layer 32, thereby preventing the sound screen from being sounded in a region other than a specific position, and further improving privacy of a user listening to a voice or a call. In one of the realizable manners, the thickness of the acoustic wave absorption layer 33 is 0.1 mm.

Further, in an implementable embodiment, a flat layer 34 is disposed on a side of the acoustic wave absorbing layer 32 away from the screen body 10, an included angle exists between a surface of the flat layer 34 close to the side of the screen body 10 and the screen body 10, because an included angle exists between a reflection surface of the acoustic wave reflecting layer 32 and the screen body 10, a surface of the acoustic wave absorbing layer 33 away from the side of the screen body 10 is not parallel to the screen body, an inclined surface is formed on a side of the acoustic wave absorbing layer 33 away from the screen body, at this time, the flat layer 34 can be perfectly attached to the inclined surface of the acoustic wave absorbing layer 33 away from the side of the screen body 10, a surface of the flat layer 34 away from the side of the screen body 10 is parallel to the screen body 10, and a surface of a most formed display panel can be a flat surface.

Optionally, the material of the flat layer 34 may be a heat conducting material, such as organic heat conducting silicone, which can absorb heat generated by the acoustic wave absorbing layer 33 due to absorbing acoustic waves, so as to prevent the acoustic wave reflecting layer 32, the acoustic wave refracting layer 31 and the screen body 10 from being damaged due to overheating of the acoustic wave absorbing layer 33, and avoid affecting the transmission path of the acoustic waves and the display effect of the screen body 10. Further, the maximum thickness of the flat layer 34 is 0.05mm, which not only can prevent the acoustic wave absorption layer 33 from being damaged due to being exposed in the external environment, but also the display effect is not affected by the thinner thickness.

A third embodiment of the present invention relates to a sound screen, and a schematic structural view of the sound screen in this embodiment is shown in fig. 2, and the third embodiment is substantially the same as the first embodiment and the second embodiment, except that the sound wave reflecting layer 32 has a sound wave reflecting surface on which sound waves are reflected, and an angle is formed between the sound wave reflecting surface and the screen body 10, and the angle is less than or equal to 0.01 degrees, so that sound waves can be better reflected to a specific position.

Further, the reflecting surface of the acoustic wave reflecting layer 32 can be disposed inside the acoustic wave reflecting layer 32, so that there is no included angle between the surface of one side of the acoustic wave reflecting layer 32 close to the screen body 10 and the screen body 10, and the acoustic wave reflecting layer 32 can be better attached above the screen body 10. In one of the realizable manners, the thickness of the acoustic wave reflective layer 32 is 0.1 mm.

A fourth embodiment of the present invention relates to a sound screen, and a schematic structural diagram of the sound screen in this embodiment is shown in fig. 2, and the fourth embodiment is substantially the same as the first embodiment, the second embodiment, and the third embodiment, except that the sound wave refracting layer 31 and the sound wave reflecting layer 32 are made of acoustic super surfaces, and the acoustic super surfaces have a sub-wavelength thickness, so that sound waves can be arbitrarily controlled, sound waves incident on the acoustic super surfaces are refracted or reflected in a specific direction, and sound waves generated by vibration of the screen body 10 can be transmitted to a specific position by cooperation between the acoustic super surfaces on the sound wave refracting layer 31 and the sound wave reflecting layer 32.

It should be noted that the second embodiment, the third embodiment, and the fourth embodiment of the present invention are all modifications of the first embodiment, and the details of the related art mentioned in the first embodiment can be still valid as in the second embodiment, the third embodiment, and the fourth embodiment. Accordingly, the related-art details mentioned in the second embodiment, the third embodiment, and the fourth embodiment can also be applied to the first embodiment.

Based on the same inventive concept, an embodiment of the present invention further provides a display device, as shown in fig. 5, which may include: the sound production screen provided by the embodiment of the invention.

Specifically, the display device may be any product or component with a display function, such as a mobile phone, a tablet computer, a television, a display, a notebook computer, a digital photo frame, and a navigator. Other essential components of the display device are understood by those skilled in the art, and are not described herein or should not be construed as limiting the invention.

The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents and the like that are within the spirit and principle of the present invention are included in the present invention.

Claims

1. A sound screen comprising a screen body and an actuator disposed on one side of said screen body, wherein:

the surface of one side, far away from the exciter, of the screen body is sequentially provided with an acoustic wave refraction layer and an acoustic wave reflection layer in a stacking mode, the acoustic wave refraction layer comprises a plurality of convex blocks with arc outer surfaces, the convex blocks are used for refracting acoustic waves generated by vibration to the acoustic wave reflection layer in the same direction, and an included angle between a reflection surface of the acoustic wave reflection layer and the screen body is an acute angle;

the convex block is a hollow hemisphere;

the hollow hemisphere comprises an inner surface and an outer surface, a labyrinth acoustic structure is arranged between the inner surface and the outer surface, the labyrinth acoustic structure comprises an acoustic transmission channel and an acoustic blocking channel, and the acoustic waves are refracted to the acoustic reflection layer along the acoustic transmission channel in the same direction.

2. The sound screen of claim 1, wherein the sound transmission channel is bent a plurality of times in the labyrinth acoustic structure, the sound transmission channel being bent a number of times greater than 5 times and less than 10 times.

3. A sound screen according to any of claims 1-2, wherein adjacent hollow hemispheres are tangent to each other.

4. A sound screen according to claim 1, wherein the sound reflecting layer is provided with a sound absorbing layer on a side thereof remote from the screen body, the sound absorbing layer being adapted to absorb sound waves refracted from the sound reflecting layer.

5. A sound screen according to claim 4, characterised in that the sound absorbing layer is provided with a flat layer on the side remote from the screen body.

6. The sound screen of claim 1, wherein the material of the acoustic wave refracting layer is an acoustic super surface.

7. A sound screen according to claim 1, wherein the angle between the reflecting surface of the sound reflecting layer and the screen body is greater than 0 degrees and less than or equal to 0.01 degrees.

8. A display device comprising the sound screen according to any one of claims 1 to 7.