TWI816048B - Display screen sound structure - Google Patents

Abstract

A display screen sound-generating structure includes a display screen and a piezoelectric sound-generating component. The display screen has a modular structure and has a display front and a back. The piezoelectric sound-generating component is in the shape of a disc and is provided on the back of the display screen through a plurality of arc-shaped support members. The support members are along the piezoelectric The sounding parts are arranged at circumferential intervals so that a sound cavity is formed between the piezoelectric sounding part and the back surface. The central angles corresponding to the support members are equal. When the piezoelectric sounding part is energized and vibrates, the sound cavity can be used to make the sounding part The display screen vibrates and makes a sound.

Description

Display screen sound structure

The present invention relates to a sound-generating structure of a display screen, and in particular, to a sound-generating structure of a display screen that uses a piezoelectric sound-generating element attached to a side of the display screen not used for display to produce sound.

In order to solve the problem of opening a sound hole at the top of the screen of mobile devices, some manufacturers have developed full-screen sound casting technology (Screen SoundCasting Technology). The so-called full-screen sound casting technology uses a display screen as a sound source to cause the display screen to vibrate. to make a sound. Today's full-screen sound technology is mainly divided into two types, one is screen actuator technology, and the other is cantilever piezoelectric ceramic technology. Taking the screen actuator technology as an example, the screen actuator technology drives a display screen through an electromagnetic actuator. Patented technologies such as WO2019/191953A1, WO2020/015472A1, WO2020/077844A1, CN110536219A, CN109889640A, CN110177322A, CN109040916A , CN108769880A , disclosed by CN108566592. However, although the screen exciter technology can make the entire display screen vibrate and achieve better directivity, the overall implementation structure is slightly complicated and there is still room for significant improvement.

Continuing with the cantilever piezoelectric ceramic technology, this cantilever piezoelectric ceramic technology fixes a huge cantilevered piezoelectric ceramic on the middle frame of a mobile phone, and generates sound through the vibration of the cantilevered piezoelectric ceramic. Patented technology such as CN111163397A revealed. Because the cantilever piezoelectric ceramic technology has unclear sound conduction direction in its implementation, that is, the sound directivity is insufficient, it is gradually being replaced by the screen exciter technology. But from a structural perspective, the structure required by the cantilever piezoelectric ceramic technology is still less than that required by the screen actuator technology. Therefore, if the criticized sound directivity problem of the cantilever piezoelectric ceramic technology can be greatly improved, it will be possible for the cantilever piezoelectric ceramic technology and its related technologies to be widely used again.

The main purpose of the present invention is to solve the problem of insufficient sound directivity in display screen sound-emitting structures conventionally implemented using cantilever piezoelectric ceramic technology.

To achieve the above object, the present invention provides a display screen sound-generating structure, which includes a display screen and a piezoelectric sound-generating component. The display screen has a modular structure and has a display front and a back. The piezoelectric sound-generating component is in the shape of a disc and is provided on the back of the display screen through a plurality of arc-shaped support members. The support members are along the piezoelectric The sounding parts are arranged at circumferential intervals so that a sound cavity is formed between the piezoelectric sounding part and the back surface. The central angles corresponding to the support members are equal. When the piezoelectric sounding part is energized and vibrates, the sound cavity can be used to make the sounding part The display screen vibrates and makes a sound.

In one embodiment, the central angles corresponding to the arc-shaped support members are greater than 30° and less than 90°, but the sum of the central angles corresponding to the arc-shaped support members is not equal to 360°.

In one embodiment, the number of the arc-shaped supporting members is at least four.

In one embodiment, there is a gap between any two adjacent arc-shaped support members, and the central angle corresponding to the gap is greater than or equal to 5° but less than or equal to 15°.

In one embodiment, there is a gap between any two adjacent ones of the arc-shaped support members, and the width of the gap is not fixed.

In one embodiment, each arc-shaped support member has a base material, a first adhesive layer provided on one side of the base material to adhere to the display screen, and a first adhesive layer provided on the other side of the base material to adhere to the display screen. The second adhesive layer of the piezoelectric sound-generating component.

In one embodiment, the piezoelectric sound-generating component has a metal vibrating piece and a piezoelectric ceramic piece disposed on the metal vibrating piece and facing the display screen. The diameter of the metal vibrating piece is larger than that of the piezoelectric ceramic piece. The arc-shaped support member is arranged along the edge of the metal vibrating piece.

In one embodiment, the metal vibrating piece has a recessed direction away from the back surface and provides an accommodating space for the piezoelectric ceramic piece. Further, the diameter of the piezoelectric ceramic piece is consistent with the diameter of the accommodation space.

In one embodiment, the piezoelectric sound-generating element has another piezoelectric ceramic piece, and the piezoelectric ceramic piece is disposed on a side of the metal vibrating piece that does not face the display screen.

Through the foregoing implementation of the present invention, compared with the conventional ones, the present invention has the following characteristics: the present invention uses the arc-shaped support members to define the sound cavity between the back side of the display screen and the piezoelectric sound-generating component, and the sound cavity is more consistent with A plurality of the gaps between the arc-shaped supports are connected, and through this structure, the sound directivity of the sound-emitting structure of the display screen is greatly improved.

11:Display screen

111:Show front

112: Back

12: Piezoelectric sound-generating parts

121:Arc support piece

122:Central angle

123: Gap

124:Substrate

125: First adhesive layer

126:Second adhesive layer

127:Metal vibrating piece

128: Piezoelectric ceramic sheet

129: Accommodation space

130:Central angle

131: Sound transmission port

132: Piezoelectric ceramic sheet

14: Tone

15: Electrical wire

16: Electrical wire

Figure 1 is a schematic structural diagram (1) of the sound emitting structure of the display screen according to the first embodiment of the present invention.

Figure 2 is a partial schematic diagram of the cross-sectional structure of line segment A-A in Figure 1.

Figure 3 is a schematic structural diagram (2) of the sound emitting structure of the display screen according to the first embodiment of the present invention.

Figure 4 is a schematic structural diagram of the sound emitting structure of the display screen according to the second embodiment of the present invention.

Figure 5 is a schematic structural diagram of the sound emitting structure of the display screen according to the third embodiment of the present invention.

Figure 6 is a schematic structural diagram of the sound emitting structure of the display screen according to the fourth embodiment of the present invention.

Figure 7 is a schematic structural diagram of the sound emitting structure of the display screen according to the fifth embodiment of the present invention.

The detailed description and technical contents of the present invention are as follows with reference to the drawings: Please refer to Figures 1 to 3. The present invention provides a display screen sound-generating structure, which includes a display screen 11 and a piezoelectric sound-generating component 12. Among them, the display screen 11 has a modular structure. The aforementioned modular structure means that after the display screen 11 is completed, it is regarded as a single component, and each component used to constitute the display screen 11 belongs to a modular structure. part. The present invention does not limit the implementation structure of the display screen 11; The display screen 11 can be made using any current technology. Viewed from the display screen 11 as a whole, the display screen 11 has a display front 111 and a back 112 .

On the other hand, the piezoelectric sounding component 12 is in the shape of a disc, and is disposed on the back 112 of the display screen 11 through a plurality of arc-shaped supporting members 121 . It should be understood that the piezoelectric sound-generating element 12 of the present invention is not placed within the display screen 11, nor is it a part of the structure of the display screen 11. The arc-shaped support members 121 are spaced apart along the circumference of the piezoelectric sound-generating member 12 , and the corresponding central angles 122 of the arc-shaped support members 121 are more equal. In addition, the arc-shaped supports 121 prevent the piezoelectric sound-generating element 12 from directly touching the back 112 of the display screen 11 and form a gap between the piezoelectric sound-generating element 12 and the back 112 of the display screen 11 The sound cavity 14. When the piezoelectric sound-generating component 12 is energized and vibrates, the sound cavity 14 can be used to cause the display screen 11 to vibrate and emit sound. Furthermore, the present invention not only prevents the piezoelectric sound-generating component 12 from touching the display screen 11 to form the sound cavity 14, but also improves the sound-raising effect and increases the sound directivity through the gaps between the arc-shaped supports 121. . In addition, the vibration generated by the sound-generating structure of the display screen of the present invention during the sound-raising process can also be used as a vibration reminder in mobile devices, and can replace the micro motors used to generate vibrations in existing mobile devices. Furthermore, when the sound-generating structure of the display screen is used to vibrate reminders, the sound generated by the piezoelectric sound-generating component 12 can be a sound that exceeds the sound range of the human ear.

As can be seen from the foregoing, the arc-shaped support members 121 of the present invention are arranged at intervals. Specifically, there is a gap 123 between any two adjacent arc-shaped support members 121. The width of the gap 123 can be determined according to the implementation. Fixed or not fixed, that is to say, the arc-shaped support members 121 can be arranged in an equidistant or unequal manner, as shown in FIGS. 3 and 4 . In one embodiment, the largest of the plurality of gaps 123 formed by the arc-shaped supports 121 can be selected, and the corresponding position of the selected gap 123 can be used as a sound transmission link to connect a sound guide member (not shown in the figure). mouth (shown as 131 in Figure 4). In one embodiment, the central angle 122 corresponding to the arc-shaped support members 121 is greater than 30° and less than 90°, but the sum of the central angles 122 corresponding to the arc-shaped support members 121 is not equal to 360°. In one embodiment, a central angle 130 corresponding to the gap 123 is greater than or equal to 5°. But less than or equal to 15°. In another embodiment, the number of the arc-shaped support members 121 is at least four. In this embodiment, the number of the arc-shaped support members 121 is related to the central angle 122 corresponding to the arc-shaped support members 121. For example, and please refer to FIG. 5 , when the number of the arc-shaped support members 121 is 10, the corresponding central angle 122 of the arc-shaped support members 121 may be 30°. Please refer to FIG. 4 again for another example. When the number of the arc-shaped supports 121 is 6, the central angle 122 corresponding to the arc-shaped supports 121 cannot be 60°. This is because the arcs The sum of the central angles 122 corresponding to the arc-shaped support members 121 is always equal to 360°, and the basic requirement of the invention that the arc-shaped support members 121 are arranged at intervals cannot be met. Therefore, in this example, the central angle 122 corresponding to the arc-shaped supports 121 needs to be less than 59°.

Please refer to FIG. 6 . In one embodiment, each support member 121 has a base material 124 , a first adhesive layer 125 provided on one side of the base material 124 for adhering to the display screen 11 , and a first adhesive layer 125 provided on one side of the base material 124 . The second adhesive layer 126 of the piezoelectric sound-generating component 12 is adhered to the other side of the base material 124 .

Please refer to FIG. 2 again. In one embodiment, the piezoelectric sound-generating component 12 has a metal vibrating piece 127 and a piezoelectric ceramic piece 128 disposed on the metal vibrating piece 127 and facing the display screen 11. The metal vibrating piece 128 The diameter of the piece 127 is larger than that of the piezoelectric ceramic piece 128 , and the arc-shaped supports 121 are provided along the edge of the metal vibrating piece 127 . During implementation, the metal vibrating piece 127 and the piezoelectric ceramic piece 128 are welded to an electrical wire 15 and 16 respectively. The electric power transmitted through the electrical wires 15 and 16 causes the piezoelectric ceramic piece 128 to drive the metal vibrating piece 127 Produces vibrations to produce sound.

Please refer to FIG. 6 again. The display screen sound-generating structure of the present invention is configured in a mobile device (not shown) in order to prevent the overall height of the metal vibrator 127 from exceeding the configuration limit of the internal structure of the mobile device. In one embodiment, the metal vibrating piece 127 has an accommodating space 129 that is recessed in a direction away from the back surface 112 and provides the piezoelectric ceramic piece 128. The depth of the accommodating space 129 may be consistent with the thickness of the piezoelectric ceramic sheet 128 . Furthermore, the diameter of the piezoelectric ceramic piece 128 can be consistent with the diameter of the accommodating space 129 . Please refer to Figure 7. In addition to the aforementioned embodiments, in one embodiment, the piezoelectric sound-generating element 12 There is also another piezoelectric ceramic piece 132 . The piezoelectric ceramic piece 132 is disposed on the side of the metal vibrating piece 127 that does not face the display screen 11 . Through the implementation of the two piezoelectric ceramic sheets 128 and 132, the sound-raising effect of the sound-emitting structure of the display screen can be improved.

The above is only a preferred embodiment of the present invention, and should not be used to limit the scope of the present invention. That is, all equivalent changes and modifications made based on the patent scope of the present invention should still fall within the scope of the patent of the present invention.

11:Display screen

112: Back

12: Piezoelectric sound-generating parts

121:Arc support piece

122:Central angle

123: Gap

127:Metal vibrating piece

128: Piezoelectric ceramic sheet

130:Central angle

Claims (11)

A display screen sound-generating structure, including: a display screen, which is a modular structure and has a display front and a back; and a piezoelectric sound-generating component, which is in the shape of a disc and is installed on the display screen through a plurality of arc-shaped supports. On the back side, the arc-shaped support members are arranged at intervals along the circumference of the piezoelectric sound-generating member so that a sound cavity is formed between the piezoelectric sound-generating member and the back surface. The central angles corresponding to the arc-shaped support members are equal, When the piezoelectric sound-generating component is energized and vibrates, the sound cavity can be used to cause the display screen to vibrate and emit sound. The central angle corresponding to the arc-shaped support members is greater than 30° and less than 90°, but the corresponding arc-shaped support members The sum of the central angles is not equal to 360°, and there is a gap between any two adjacent arc-shaped supports. The central angle corresponding to the gap is greater than or equal to 5° but less than or equal to 15°. The display screen sound emitting structure according to claim 1, wherein the number of the arc-shaped supporting members is at least four. The screen sound emitting structure is displayed as described in any one of claims 1 to 2, wherein the gap width is not fixed. The display screen sound-generating structure of claim 3, wherein each arc-shaped support member has a base material, a first adhesive layer provided on one side of the base material to adhere to the display screen, and a first adhesive layer provided on the The second adhesive layer of the piezoelectric sound-generating component is adhered to the other side of the base material. The display screen sound-generating structure according to any one of claims 1 to 2, wherein each arc-shaped support member has a base material and a first adhesive layer provided on one side of the base material to adhere to the display screen, and a second adhesive layer provided on the other side of the base material to adhere the piezoelectric sound-generating component. The display screen sound-generating structure according to any one of claims 1 to 2, wherein the piezoelectric sound-generating element has a metal vibrating piece and a piezoelectric ceramic piece disposed on the metal vibrating piece and facing the display screen, and the metal vibrating piece The diameter of the vibrating piece is larger than that of the piezoelectric ceramic piece, and the arc-shaped supporting members are arranged along the edge of the metal vibrating piece. The display screen sound emitting structure as described in claim 6, wherein the metal vibrating piece has a recessed direction away from the back surface and provides an accommodation space for the piezoelectric ceramic piece. The display screen sound emitting structure as described in claim 7, wherein the diameter of the piezoelectric ceramic sheet is consistent with the diameter of the accommodating space. The display screen sound-generating structure of claim 8, wherein each arc-shaped support member has a base material, a first adhesive layer provided on one side of the base material to adhere to the display screen, and a first adhesive layer provided on the The second adhesive layer of the piezoelectric sound-generating component is adhered to the other side of the base material. The display screen sound-generating structure of claim 9, wherein the piezoelectric sound-generating element has another piezoelectric ceramic piece, and the piezoelectric ceramic piece is disposed on the side of the metal vibrating piece that does not face the display screen. The display screen sound-generating structure of claim 6, wherein the piezoelectric sound-generating element has another piezoelectric ceramic piece, and the piezoelectric ceramic piece is disposed on the side of the metal vibrating piece that does not face the display screen.

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