阅读说明：本技术 面板发声装置 (Panel sound production device ) 是由 郑岳世 刘驰中 于 2020-05-26 设计创作，主要内容包括：本发明公开一种面板发声装置,其中包括一基板、至少一第一薄膜发声组件及至少一第二薄膜发声组件。所述基板能够界定出一工作区域；至少一所述第一薄膜发声组件和至少一所述第二薄膜发声组件分别设置于所述基板的上侧面或下侧面,且共同地覆盖所述工作区域；其中,至少一所述第一薄膜发声组件和至少一所述第二薄膜发声组件分别具有一压电薄膜,以及设置于所述压电薄膜相对两个侧面的导电层；其中,至少一所述第一薄膜发声组件的所述压电薄膜的厚度和至少一所述第二薄膜发声组件的所述压电薄膜的厚度不相等。(The invention discloses a panel sound production device which comprises a substrate, at least one first film sound production assembly and at least one second film sound production assembly. The substrate can define a working area; the at least one first film sounding component and the at least one second film sounding component are respectively arranged on the upper side surface or the lower side surface of the substrate and jointly cover the working area; the at least one first film sounding component and the at least one second film sounding component are respectively provided with a piezoelectric film and conducting layers arranged on two opposite side surfaces of the piezoelectric film; the thickness of the piezoelectric film of at least one first film sounding component is not equal to that of the piezoelectric film of at least one second film sounding component.)

1. A panel sound generating apparatus, comprising:

the substrate is provided with an upper side face and a lower side face which are opposite, and can define a working area;

the at least one first film sounding component and the at least one second film sounding component are respectively arranged on the upper side surface or the lower side surface of the substrate and jointly cover the working area;

the at least one first film sounding component and the at least one second film sounding component are respectively provided with a piezoelectric film and a conducting layer arranged on two opposite side surfaces of the piezoelectric film.

2. The panel sound generating apparatus of claim 1, wherein at least one of the first film sound generating element and at least one of the second film sound generating element are commonly disposed on an upper side or a lower side of the base plate, and at least one of the first film sound generating element and at least one of the second film sound generating element are disposed in the active area of the base plate to overlap each other.

3. The panel sound generating apparatus of claim 1, wherein at least one of the first film sound generating elements and at least one of the second film sound generating elements are disposed opposite to each other on the upper and lower sides of the base plate, and at least one of the first film sound generating elements and at least one of the second film sound generating elements cover the working area from the upper and lower sides of the base plate, respectively.

4. The panel sound generator of claim 1, wherein the first membrane sound generator and the second membrane sound generator are connected in parallel to an audio signal.

5. The panel sound generator of claim 1, wherein the first and second membrane sound generating assemblies are connected to a sound splitting circuit.

6. The panel sound generator of claim 1, wherein the piezoelectric film is selected from one of polyvinylidene fluoride, nylon, polyvinyl chloride, polymethyl methacrylate, polypropylene; wherein the conductive layer is selected from one of a conductive nano material layer, a nano metal material layer, a metal oxide conductive layer, a conductive polymer material layer or a conductive adhesive material layer.

7. The panel sound generating apparatus of any one of claims 1 to 6, wherein at least one of the first film sound generating element and at least one of the second film sound generating element are attached to the upper side or the lower side of the substrate by an adhesive layer, respectively, or the at least one of the first film sound generating element and the at least one of the second film sound generating element are attached to each other by the adhesive layer.

8. The panel sound generating apparatus of claim 7, wherein the adhesive layer is a transparent optical glue.

9. The panel sound generating apparatus of any one of claims 1 to 6, wherein at least one of the first film sound generating element and at least one of the second film sound generating element are attached to the upper side or the lower side of the substrate via a spacer member, respectively, or the at least one of the first film sound generating element and the at least one of the second film sound generating element are attached to each other via the spacer member, and a plurality of gaps are formed between the at least one of the first film sound generating element and the at least one of the second film sound generating element and the substrate, respectively, or between the at least one of the first film sound generating element and the at least one of the second film sound generating element.

10. The panel sound generator of claim 9, wherein the spacer member is a double sided tape.

11. The panel sound generating apparatus of any one of claims 1 to 6, wherein the thickness of the piezoelectric film of at least one of the first film sound generating elements and the thickness of the piezoelectric film of at least one of the second film sound generating elements are not equal.

Technical Field

The present invention relates to a panel sound generating device, and more particularly, to a panel sound generating device integrated with a display panel of a mobile phone, a handheld computer, or a notebook computer.

Background

With the mature technology of touch display panels, touch panels are widely used as display panels in electronic products such as mobile phones, tablet computers, and notebook computers.

In addition, in order to achieve the purpose of reducing the size and increasing the visible area of the screen, the conventional electronic product usually adopts a narrow frame design to reduce the size of the frame of the electronic product as much as possible, so that the area of the screen display panel is enlarged as much as possible. However, in the conventional electronic product, more than one speaker is usually disposed to output audio signals, so that speaker holes must be disposed on a frame of the electronic product, even a gap or an opening is disposed on the display panel to accommodate the sound output holes of the speaker, which results in that the frame size of the electronic product cannot be reduced, and the display panel is disposed with the gap or the opening, thereby affecting the visible area of the display panel and affecting the integrity of the display screen.

Therefore, in order to reduce the size of the frame and improve the area and integrity of the display area of the display panel, the screen sounding technology is adopted in some existing electronic products, the existing screen sounding technology is roughly that a piezoelectric vibration component is arranged on one side edge of the display panel, the piezoelectric vibration component is attached to one side surface of the display panel and electrically connected with a sound source signal, and therefore the display panel can be driven to vibrate through the piezoelectric vibration component, so that the display panel becomes a sounding unit to output sound.

However, the piezoelectric vibration component adopted by the existing screen sounding technology is usually only arranged at the edge corner of the display panel, so that the screen sounding area is limited, and the output sound quality is not favorable.

For the above reasons, the sound-generating component of the conventional electronic product is disadvantageous, and how to solve the above problems through structural improvement has become one of the important issues to be solved by the product.

Disclosure of Invention

The invention mainly aims to solve the problem that the existing screen sounding device is poor in sounding efficiency.

In order to solve the above technical problems, an embodiment of the present invention provides a panel sound generating device, which includes a substrate, at least one first film sound generating element, and at least one second film sound generating element. The substrate is provided with an upper side face and a lower side face which are opposite, and a working area can be defined; the at least one first film sounding component and the at least one second film sounding component are respectively arranged on the upper side surface or the lower side surface of the substrate and jointly cover the working area; the at least one first film sounding component and the at least one second film sounding component are respectively provided with a piezoelectric film and a conducting layer arranged on two opposite side surfaces of the piezoelectric film. The thickness of the piezoelectric film of at least one first film sounding component is not equal to that of the piezoelectric film of at least one second film sounding component.

In a preferred embodiment of the present invention, at least one of the first film sound generating elements and at least one of the second film sound generating elements are commonly disposed on the upper side or the lower side of the substrate, and at least one of the first film sound generating elements and at least one of the second film sound generating elements are disposed in the working area of the substrate so as to overlap each other.

In a preferred embodiment of the present invention, at least one of the first film sound generating elements and at least one of the second film sound generating elements are disposed opposite to each other on the upper side and the lower side of the substrate, and the at least one of the first film sound generating elements and the at least one of the second film sound generating elements cover the working area from the upper side and the lower side of the substrate, respectively.

In a preferred embodiment of the present invention, the first film sound generating assembly and the second film sound generating assembly are connected in parallel to an audio source signal.

In a preferred embodiment of the present invention, the first film sound generating assembly and the second film sound generating assembly are connected to a sound dividing circuit.

In a preferred embodiment of the present invention, the piezoelectric film is selected from one of polyvinylidene fluoride, nylon, polyvinyl chloride, polymethyl methacrylate, and polypropylene; wherein the conductive layer is selected from one of a conductive nano material layer, a nano metal material layer, a metal oxide conductive layer, a conductive polymer material layer or a conductive adhesive material layer.

In a preferred embodiment of the present invention, at least one of the first film sound generating elements and at least one of the second film sound generating elements are respectively attached to the upper side or the lower side of the substrate through an adhesive layer, or at least one of the first film sound generating elements and at least one of the second film sound generating elements are attached to each other through the adhesive layer.

In a preferred embodiment of the present invention, the adhesive layer is a transparent optical adhesive.

In a preferred embodiment of the present invention, at least one of the first film sound generating elements and at least one of the second film sound generating elements are attached to the upper side or the lower side of the substrate through a spacer, or at least one of the first film sound generating elements and at least one of the second film sound generating elements are attached to each other through the spacer, and a plurality of gaps are formed between at least one of the first film sound generating elements and at least one of the second film sound generating elements and the substrate, or between at least one of the first film sound generating elements and at least one of the second film sound generating elements.

In a preferred embodiment of the present invention, the spacer member is a double-sided tape.

At least one beneficial effect of the invention lies in that, because the first film sounding component and the second film sounding component are combined on the substrate, when the first film sounding component and the second film sounding component vibrate to make a sound, the substrate can also vibrate therewith, so that the substrate also forms a part of the sounding vibrator, thereby solving the problem of poor sounding efficiency of the screen sounding device.

For a better understanding of the features and technical content of the present invention, reference should be made to the following detailed description of the invention and accompanying drawings, which are provided for purposes of illustration and description only and are not intended to limit the invention.

Drawings

Fig. 1 is a perspective exploded view of an electronic device equipped with a panel sound generating device according to the present invention.

Fig. 2 is a partially enlarged sectional view of the panel sound generating device according to the first embodiment of the present invention.

Fig. 3 is a partially enlarged sectional view of a panel sound generating device according to a second embodiment of the present invention.

Fig. 4 is a partially enlarged sectional view of a panel sound generating device according to a third embodiment of the present invention.

Fig. 5 is a partially enlarged sectional view of a fourth embodiment of the panel sound generating device of the present invention.

Fig. 6 is a schematic exploded perspective view of a fifth embodiment of a panel sound generator according to the present invention.

Fig. 7 is a schematic partial enlarged cross-sectional view of a fifth embodiment of a panel sound generating device according to the present invention.

Fig. 8 is a schematic partial enlarged cross-sectional view of a sixth embodiment of a panel sound generating device according to the present invention.

Fig. 9 is a partially enlarged sectional view of a seventh embodiment of the panel sound generating apparatus of the present invention.

Fig. 10 is a partially enlarged sectional view of an eighth embodiment of the panel sound generating apparatus according to the present invention.

Fig. 11 is a partially enlarged sectional view of a ninth embodiment of the panel sound generating apparatus according to the present invention.

Fig. 12 is a schematic diagram of an embodiment of the panel sound generating device of the present invention in which the thin film sound generating elements are connected in parallel to the sound source signal.

Fig. 13 is a schematic diagram of the connection between the film sound generating component and a sound dividing circuit of the panel sound generating device according to the embodiment of the present invention.

Detailed Description

The following is a description of the embodiments of the "panel sound generating device" disclosed in the present invention with reference to specific embodiments, and those skilled in the art will understand the advantages and effects of the present invention from the disclosure of the present specification. The invention is capable of other and different embodiments and its several details are capable of modifications and various changes in detail, all without departing from the spirit and scope of the present invention. The drawings of the present invention are for illustrative purposes only and are not intended to be drawn to scale. The following embodiments will further explain the related art of the present invention in detail, but the disclosure is not intended to limit the scope of the present invention. In addition, the term "or" as used herein should be taken to include any one or combination of more of the associated listed items as the case may be.

[ first embodiment ]

Referring to fig. 1 and 2, a first embodiment of the present invention provides a panel sound-generating device 1, where the panel sound-generating device 1 can be applied to mobile electronic devices such as mobile phones, tablet computers, handheld computers, and the like, and is used as an electronic component such as a speaker, an ultrasonic generator, or a vibration generator.

As shown in fig. 1, an embodiment of an electronic device 50 provided with the panel sound generating device 1 of the present invention is shown, wherein the electronic device 50 has a main body, and the main body of the electronic device 50 has a mounting portion 51 for mounting the panel sound generating device 1 of the present invention. In this embodiment, the panel sound generating apparatus 1 is provided with a connection flat cable 12, and a connector 54 is provided on the body portion of the electronic device 50 for connecting with the connection flat cable 12 of the panel sound generating apparatus 1. In addition, a speaker 52 is disposed inside the electronic device 50, and a sound outlet 53 is disposed on the housing of the electronic device 50, so that the sound emitted from the speaker 52 can pass through the sound outlet 53. Thus, the electronic apparatus 50 is enabled to output an audio signal collectively through the panel sound emission device 1 and the speaker 52. In addition, in the present embodiment, the panel sound emitting device 1 and the speaker 52 can be configured to output sound fields with different audio frequency ranges, so as to expand the audio frequency range of the sound field output by the electronic device 50.

As shown in fig. 2, the panel sound generating device 1 of the present invention has a substrate 10, and a first film sound generating unit 20a and a second film sound generating unit 20b disposed on the substrate 10. Wherein the substrate 10 may be a liquid crystal display panel (LCD), an organic light emitting diode display panel (OLED), a MICRO light emitting diode display panel (MICRO LED) or other types of display panels, the substrate 10 has an upper side and a lower side opposite to each other, and the substrate 10 is capable of defining a working area 11. The first and second film sounding components 20a and 20b are disposed within the range of the working area 11 of the substrate 10, and the first and second film sounding components 20a and 20b can be disposed on the upper or lower side of the substrate 10 in an overlapping manner.

In particular, in the embodiment, although the first film sound generating unit 20a and the second film sound generating unit 20b are disclosed as one, the number of the first film sound generating unit 20a and the second film sound generating unit 20b can be changed according to the requirement when the present invention is actually used, for example: the number of the first film sounding members 20a or the second film sounding members 20b may be two or more. Further, it is also possible to further provide a third, fourth or more different types of film sound emitting elements on the substrate 10 in addition to the first film sound emitting element 20a and the second film sound emitting element 20 b.

As shown in fig. 2, 12 and 13, the first thin film sound generating component 20a and the second thin film sound generating component 20b of the present invention are piezoelectric thin film sound generating components, wherein the first thin film sound generating component 20a and the second thin film sound generating component 20b respectively have a piezoelectric thin film 21a and a piezoelectric thin film 21b, and conductive layers 22a and b disposed on the side surfaces of the piezoelectric thin films 21a and b. Moreover, the thickness of the piezoelectric film 21a of the first film sounding component 20a and the thickness of the piezoelectric film 21b of the second film sounding component 20b are different from each other, so that the first film sounding component 20a and the second film sounding component 20b respectively have different frequency characteristics, and are suitable for emitting acoustic signals in different frequency ranges.

More specifically, the piezoelectric thin films 21a and b are made of a polymer material having piezoelectric properties, such as: polyvinylidene fluoride (PVDF), Nylon (Nylon), polyvinyl chloride (PVC), polymethyl methacrylate (PMMA), polypropylene (PP). The two conductive layers 22a and b are disposed on both sides of the piezoelectric films 21a and b by evaporation, sputtering, deposition, coating, printing, or the like. The two conductive layers 22a and b are made of conductive materials, and the materials that can be selected for the conductive layers 22a and b include conductive nano material layers, nano metal material layers, metal oxide conductive layers, conductive polymer material layers or conductive adhesive material layers.

When the conductive layers 22a, b are made of nano conductive material or nano metal, the material types that can be selected include: carbon nanotubes, graphene, carbon nanospheres, nanogold, silver nanowires, metal nanowires, and the like. When the conductive layers 22a, b are transparent metal oxide conductive layers, they may be Indium Tin Oxide (ITO) layers. In addition, the conductive layers 22a and b can also be made of transparent conductive polymer material or transparent conductive adhesive, wherein the transparent conductive polymer material can be intrinsic conductive polymer (intrinsic conductive polymer), such as: polyacetylene, PEDOT. Or a polymer material film doped or mixed with conductive particles or transparent conductive adhesive.

As shown in fig. 12 and 13, the first and second thin film sound generating units 20a and 20b operate on the principle that the conductive layers 22 are disposed on both sides of the piezoelectric thin films 21a and b, so that when a voltage signal is transmitted to the conductive layers 22a and 22b, both sides of the piezoelectric thin films 21a and b are provided with an electric field, and the piezoelectric thin films 21a and b vibrate due to the inverse piezoelectric principle, so that the first and second thin film sound generating units 20a and 20b generate sound.

Since the first film sound-generating component 20a and the second film sound-generating component 20b have different frequency characteristics, the panel sound-generating device 1 of the present invention can generate sound audio signals in different frequency ranges through the first film sound-generating component 20a and the second film sound-generating component 20b, so that the range of the sound range that can be output by the panel sound-generating device 1 is increased, and the output sound quality is improved. For example, in the embodiment shown in fig. 12, the first film sound-generating component 20a and the second film sound-generating component 20b are connected to a sound source signal 60 in parallel, that is, the conductive layers 22a and b on the same side of the first film sound-generating component 20a and the second film sound-generating component 20b are commonly connected to the positive electrode or the negative electrode of the sound source signal 60 through conductive traces, so that the first film sound-generating component 20a and the second film sound-generating component 20b are commonly driven to generate sound through the same sound source signal 60.

In the embodiment shown in fig. 13, the first film sound-producing unit 20a and the second film sound-producing unit 20b are connected to a sound-dividing circuit 70, and the sound-dividing circuit 70 divides the sound source signal and outputs sound signals of different frequencies to the first film sound-producing unit 20a and the second film sound-producing unit 20b, so that the first film sound-producing unit 20a and the second film sound-producing unit 20b are respectively used for outputting sound signals of different frequency ranges.

As shown in fig. 2, in the present embodiment, the first film sounding member 20a and the second film sounding member 20b are commonly disposed on the upper side of the substrate 10 in a mutually overlapping manner. In the present embodiment, the bottom surface of the first film sound generating element 20a is attached to the upper side surface of the substrate 10 through an adhesive layer 30, and the bottom surface of the second film sound generating element 20b is also attached to the upper side surface of the first film sound generating element 20a through the adhesive layer 30.

In more detail, in the present embodiment, the substrate 10 can be a display panel of an electronic device, and the piezoelectric films 21a and 21b and the conductive layers 22a and 22b of the first and second film sounding components 20a and 20b are transparent, so that the first and second film sounding components 20a and 20b form a transparent structure, and light or images output by the substrate 10 can pass through the first and second film sounding components 20a and 20 b. In addition, in this embodiment, the adhesive layer is made of transparent optical adhesive, and the first film sound-generating component 20a and the second film sound-generating component 20b are disposed on the substrate 10 in a full-lamination manner, so that the light transmittance of the first film sound-generating component 20a and the second film sound-generating component 20b is improved, and the loss of light is reduced.

Because the first film sound generating assembly 20a and the second film sound generating assembly 20b are combined on the substrate 10, when the first film sound generating assembly 20a and the second film sound generating assembly 20b vibrate to generate sound, the substrate 10 can also vibrate therewith, and the substrate 10 also forms a part of the sound generating vibrator.

[ second embodiment ]

As shown in fig. 3, the basic structure and principle of the second embodiment of the present invention are similar to those of the first embodiment, and therefore, the description of the same technical features will not be repeated.

The difference between the present embodiment and the first embodiment is that the first film sound generating element 20a is disposed on the upper side of the substrate 10 through a spacer 40, and the second film sound generating element 20b is also disposed on the upper side of the first film sound generating element 20a through the spacer 40. The spacing member 40 is partially attached between the first film sounding element 20a and the substrate 10, and between the second film sounding element 20b and the first film sounding element 20a, so that a gap 41 is formed between the first film sounding element 20a and the substrate 10, and between the second film sounding element 20b and the first film sounding element 20a, respectively.

In more detail, in the present embodiment, the spacing member 40 may be a double-sided tape, and the spacing member 40 is disposed at the edge of the first film sound generating assembly 20a and the edge of the second film sound generating assembly 20b, so that the edges of the first film sound generating assembly 20a and the second film sound generating assembly 20b can be bonded to the spacing member 40 and are elevated by the spacing member 40 to form the gap 41 below the first film sound generating assembly 20a and the second film sound generating assembly 20 b.

In this embodiment, the gap 41 below the first and second film sounding components 20a and 20b can form a resonant cavity, so that when the first and second film sounding components 20a and 20b vibrate, the medium in the gap 41 can resonate, and the sound output by the first and second film sounding components 20a and 20b is amplified.

[ third embodiment ]

Fig. 4 shows a third embodiment of the present invention. The panel sound generating device 1 disclosed in this embodiment has a substrate 10, the substrate 10 has an upper side and a lower side opposite to each other, and the first thin film sound generating component 20a and the second thin film sound generating component 20b are disposed on the upper side and the lower side of the substrate 10 opposite to each other, and the first thin film sound generating component 20a and the second thin film sound generating component 20b cover the working area 11 from the upper side and the lower side of the substrate 10, respectively. The first film sound generating element 20a and the second film sound generating element 20b of the present embodiment are respectively bonded to the upper side and the lower side of the substrate 10 through the adhesive layer 30.

[ fourth embodiment ]

Fig. 5 shows a fourth embodiment of the present invention. The panel sound generating device 1 disclosed in this embodiment is the same as the third embodiment, and has a substrate 10, the substrate 10 has an upper side and a lower side opposite to each other, and the first thin film sound generating element 20a and the second thin film sound generating element 20b are disposed on the upper side and the lower side of the substrate 10 opposite to each other, and the first thin film sound generating element 20a and the second thin film sound generating element 20b cover the working area 11 from the upper side and the lower side of the substrate 10, respectively.

The present embodiment is different from the third embodiment in that the first and second film sounding components 20a and 20b are attached to the upper and lower sides of the substrate 10 through the spacer member 40, and the spacer member 40 is partially attached between the upper and lower sides of the first and second film sounding components 20a and 20b and the substrate 10, so that two gaps 41 are respectively formed between the upper and lower sides of the first and second film sounding components 20a and 20b and the substrate 10. And the gap 41 forms a resonance chamber of the first and second membrane sound emitting modules 20a and 20 b.

[ fifth embodiment ]

As shown in fig. 6 and 7, a fifth embodiment of the present invention is characterized in that the panel sound generating apparatus 1 of the present invention is designed to be used as an off-screen ultrasonic component of a display panel. In this embodiment, the working area 11 of the substrate 10 is planned on the lower side of the substrate 10, and the first and second film sounding members 20a and 20b are commonly disposed in the working area 11 on the lower side of the substrate 10. The first and second film sounding members 20a and 20b are respectively attached to the lower side of the substrate 10 through adhesive layers 30.

[ sixth to ninth embodiments ]

As shown in fig. 8 to 11, sixth to ninth embodiments of the present invention are provided. The sixth to ninth embodiments of the present invention are different from the above-described embodiments in that the piezoelectric films 21a and 21b used for the first and second film sounding members 20a and 20b have the same thickness. Wherein. In particular, in the sixth to ninth embodiments of the present invention, the first and second film sounding members 20a and 20b are arranged in a manner similar to that of the first to fourth embodiments, respectively, and therefore, description thereof will not be repeated.

The disclosure is only a preferred embodiment of the invention and should not be taken as limiting the scope of the invention, which is defined by the appended claims.