WO2021097889A1 - Screen sound producing device and method - Google Patents

Abstract

A screen sound producing device (10) and method. The device comprises a screen (11), a rear cover (12), and a middle frame (13) provided between the screen (11) and the rear cover (12). The screen (11) and the rear cover (12) are respectively fixed at two sides of the middle frame (13) to form a cavity; an exciter (131) fixed on the screen is provided on the middle frame (13), a vibrator (132) and a signal processor (133) electrically connected to the vibrator (132) are further fixed on the middle frame (13), and the vibrator (132) is provided between the middle frame (13) and the rear cover (12). When the exciter (131) vibrates to cause the screen (11) to vibrate and produce sound, the signal processor (133) processes a driving signal in the vibrator (132), so that the vibrator (132) and the exciter (131) vibrate synchronously and reversely to counteract the vibration of the middle frame (13) and/or the rear cover (12). According to the technical solution, excessive vibration senses caused by vibration of the rear cover (12) can be reduced, and the comfort of holding a mobile terminal for a long time by a user is improved.

Description

Screen sounding equipment and method 【Technical Field】

The present invention relates to the technical field of acoustic equipment, in particular to a screen sounding equipment and method.

【Background technique】

Existing screen sound-producing devices use an exciter to drive the device structure to vibrate and sound. The structure can be the panel, back cover, etc. When the exciter is working, it drives the screen to vibrate and produce sound. While driving the screen to vibrate, it will also give a driving force to the middle frame of the mobile terminal, causing the middle frame of the mobile terminal to vibrate, and the vibration of the middle frame is transmitted to the back cover, because the back cover is thin and light. , It will also cause obvious vibration of the back cover. Therefore, the user can clearly perceive this vibration when holding the mobile terminal.

However, when the user holds the mobile terminal, the vibration sensation transferred from the back cover to the user's hand is not conducive to the user's holding the mobile terminal for a long time, and affects the user's comfort when using this type of mobile terminal.

[Summary of the invention]

The main purpose of the present invention is to provide a screen sounding device and method to solve the problem that the existing screen sounding device has excess vibration when driving the screen to vibrate and sound, which affects the user's long-term holding of the mobile terminal.

In order to achieve the foregoing objective, the first aspect of the embodiments of the present invention provides a screen sounding device, including a screen, a back cover, and a middle frame interposed between the screen and the back cover, and the screen and the back cover are respectively Fixed on both sides of the middle frame to form a cavity together with the middle frame; the middle frame is provided with an exciter fixed on the screen;

A vibrator is also fixed on the middle frame, and the vibrator is placed between the middle frame and the back cover;

The screen sound generating device further includes a signal processor electrically connected to the vibrator and the exciter;

When the signal processor sends a first driving signal to the exciter to cause the screen to vibrate and produce sound, the signal processor simultaneously processes the first driving signal to obtain a second driving signal and sends it to the vibrator, so that The vibrator and the exciter perform synchronous reverse vibration to offset the vibration of the middle frame and/or the back cover.

With reference to the first aspect of the present invention, in the first embodiment of the present invention, the signal processor includes a signal calculation module and a signal sending module;

The signal calculation module is configured to set the second drive signal input to the vibrator according to the first drive signal input to the exciter;

The signal sending module is configured to send the second driving signal to the vibrator, so that when the vibrator drives the middle frame to vibrate with the second driving signal, the middle frame and/or the The vibration response of the back cover and the vibration response of the middle frame and/or the back cover when the exciter drives the screen to vibrate with the first driving signal to produce sound.

With reference to the first embodiment of the first aspect of the present invention, in the second embodiment of the present invention, the signal calculation module includes a first calculation unit, a second calculation unit, a third calculation unit, and a transfer function calculation unit;

_{The first calculation unit is configured to calculate the vibration response Y 1} (s) of the middle frame when the exciter drives the screen to vibrate and produce sound with the first driving signal;

_{The second calculation unit is configured to calculate the vibration response Y 2} (s) at any position on the back cover when the exciter is not working and the vibrator drives the middle frame to vibrate with the second driving signal. );

The third calculation unit is configured to calculate the response Y(s) of any position on the middle frame of the exciter and the vibrator when the input signal is X(s);

The transfer function calculation unit is used to calculate the transfer function H(s) of the signal processor when the response Y(s) at any position of the middle frame is 0;

The signal processor with the transfer function H(s) makes the vibration response of the middle frame and/or the back cover when the vibrator drives the middle frame to vibrate with the second driving signal, and When the exciter drives the screen to vibrate and sound with the first driving signal, the vibration responses of the middle frame and/or the back cover cancel each other out.

In combination with the second embodiment of the first aspect of the present invention, in the third embodiment of the present invention, the _{calculation formula of the vibration response Y 1} (s) of the middle frame is:

Y ₁ (s) = X ₁ (s)·H ₁ (s), where X ₁ (s) is the input signal of the exciter, and H ₁ (s) is the system including the exciter, the middle frame and the vibration propagation path Transfer Function;

_{The calculation formula of the vibration response Y 2} (s) at any position on the back cover is:

Y ₂ (s) = X ₂ (s)·H ₂ (s), where X ₂ (s) is the input signal of the vibrator, and H ₂ (s) is the system including the vibrator, the middle frame and the vibration propagation path Transfer Function;

The calculation formula of the response Y(s) at any position on the middle frame is:

Y(s)=X(s)·H ₁ (s)+X(s)·H(s)·H ₂ (s), where H(s) is the transfer function of the signal processor, X(s) Is the first drive signal of the input exciter, X(s)·H(s) is the second drive signal of the input signal processor;

Then when the response Y(s) at any position of the middle frame is 0, the calculation formula of the transfer function H(s) of the signal processor is:

With reference to the first aspect of the present invention, in the fourth embodiment of the present invention, the part of the middle frame where the exciter is not fixed includes a plurality of target positions;

The vibrator is provided at each of the target positions.

In combination with the first aspect of the present invention, in the fifth embodiment of the present invention, the vibrator is a z-direction vibration motor.

The second aspect of the present invention provides a screen sounding method, which is applied to the screen sounding device as described in the first aspect, and the method includes:

Acquiring the first driving signal input to the exciter;

Calculating a second driving signal input to the vibrator according to the first driving signal;

The vibrator is driven by the second driving signal, so that the vibrator and the exciter perform synchronous reverse vibration to cancel the vibration of the middle frame and/or the back cover.

The beneficial effect of the present invention is that the exciter is fixed between the middle frame and the screen to drive the screen to vibrate while driving the middle frame and the back cover to vibrate, and the vibrator is fixed between the middle frame and the back cover. When the vibration of the exciter causes the screen to vibrate, the vibrator vibrates at the same time and causes the middle frame to vibrate. Through the processing of the signal processor, the vibrator and the exciter perform synchronous reverse vibration to counteract the vibration effect of the middle frame caused by the exciter. At this time, the middle frame always receives pressure from the opposite direction, thus reducing the vibration of the middle frame, and at the same time reducing the transmission of the middle frame vibration to the back cover, and finally reducing the excess vibration caused by the back cover vibration and improving the user's long life. The comfort of holding the mobile terminal in time.

【Explanation of the drawings】

FIG. 1 is a schematic diagram of a three-dimensional structure of a screen sound emitting device according to Embodiment 1 of the present invention;

Figure 2 is a cross-sectional view in the direction of A-A in Figure 1;

FIG. 3 is a schematic diagram of internal signal transmission of the screen sound emitting device according to the first embodiment of the present invention;

4 is a schematic structural diagram of a screen sounding device provided in Embodiment 3 of the present invention;

FIG. 5 is a schematic diagram of the implementation process of the screen sounding method provided in the fourth embodiment of the present invention.

【Detailed ways】

The present invention will be further described below in conjunction with the drawings and embodiments.

In the following description, the serial numbers of the embodiments of the invention are for description only, and do not represent the advantages and disadvantages of the embodiments.

Example one

As shown in FIG. 1 and FIG. 2, an embodiment of the present invention provides a screen sound emitting device 10. FIG. 1 is a schematic diagram of a three-dimensional structure of the screen sound emitting device 10, and FIG. 2 is a schematic diagram of a three-dimensional structure of the screen sound emitting device.

In the embodiment of the present invention, the screen sounding device 10 includes a screen 11, a back cover 12, and a middle frame 13 placed between the screen 11 and the back cover 12. The screen 11 and the back cover 12 are respectively fixed on both sides of the middle frame 13 Two cavities are formed, one cavity is the space formed between the middle frame 13 and the back cover 12, and the other cavity is the space formed between the middle frame 13 and the screen 11.

The middle frame 13 is provided with an exciter 131 fixed on the screen 11. When the exciter 131 vibrates, the screen 11 that has a fixed connection relationship with the exciter 131 also vibrates, thereby completing the sound function of the screen sound device 10.

The part of the middle frame 13 that is not provided with the exciter 131 is also fixed with a vibrator 132 and a signal processor 133 electrically connected to the vibrator 132. The signal processor 133 controls the input signal in the vibrator 132, thereby controlling the vibrator 132 The vibration frequency, vibration phase and so on.

In specific applications, the vibrator 132 is placed between the middle frame 13 and the back cover 12.

In specific applications, the vibrator 132 may be a z-direction vibration motor.

In the embodiment of the present invention, when the exciter 131 vibrates to cause the screen 11 to vibrate, that is, the exciter 131 vibrates. When the middle frame 12 and the screen 11 vibrate, the vibrator 132 also vibrates, because the vibrator 132 is fixed to the middle frame 12. Therefore, the middle frame 13 also vibrates, and through the processing of the signal processor 133, the drive signal in the exciter 131 and the drive signal in the vibrator 132 have an antiphase vibration relationship, that is, the signal processor 133 responds to the input vibrator The driving signal in 132 is processed, so that the exciter 131 vibrates and the vibration of the middle frame 13 and the vibrator 132 are combined with the vibration of the middle frame 13, and the vibrator 132 and the exciter 131 perform synchronous and reverse vibrations.

In this embodiment of the present invention, the signal processor 133 is used to obtain the driving signal of the input vibrator 132 according to the driving signal of the input exciter 131. These two signals enable the middle frame 13 to obtain the force in the opposite direction, thereby reducing The effect of the vibration of the middle frame 13 also reduces the transmission of the vibration of the middle frame 13 to the back cover 12, thereby reducing the vibration of the back cover 12, that is, to offset the vibration of the middle frame 13, the vibration of the back cover 12, or both the middle frame 13 and the back cover 12. The effect of the vibration of the back cover 12.

As shown in FIG. 3, the embodiment of the present invention also shows a schematic diagram of the signal transmission of the internal circuit in the screen sound generating device 10. The driving signals input to the exciter 131 and the vibrator 132 are originally the same, but the signal input to the exciter 131 and the vibration Before the device 132, it is processed by the signal processor 133, so that the drive signals in the exciter 131 and the vibrator 132 are different, and the effect of anti-phase vibration is achieved. The effect of the anti-phase vibration is that the vibrator and the vibrator 132 are different from each other. The effect achieved by the exciter for synchronous reverse vibration.

The screen sounding device provided by the embodiment of the present invention includes a screen, a back cover, and a middle frame placed between the screen and the back cover. The screen and the back cover are respectively fixed on two opposite surfaces of the middle frame, and the exciter is fixed on the middle frame. Drive the screen to vibrate between the screen and the screen, and drive the middle frame and back cover to vibrate at the same time. The vibrator is fixed between the middle frame and the back cover. When the vibration of the exciter causes the screen to vibrate, the vibrator vibrates at the same time and causes the middle frame to vibrate. Through the processing of the signal processor, the vibrator and the exciter perform synchronous reverse vibration, thereby canceling the vibration effect of the middle frame caused by the exciter. At this time, the middle frame always gets the pressure from the opposite direction, thus reducing the middle frame. The vibration effect also reduces the transmission of the vibration of the middle frame to the rear cover, and finally reduces the excess vibration caused by the vibration of the rear cover, and improves the user's comfort in holding the mobile terminal for a long time.

Example two

The embodiment of the present invention shows each module unit related to the calculation of the second driving signal and the function of each module in the signal processor of the first embodiment.

In the embodiment of the present invention, the signal processor may include a signal calculation module and a signal sending module. In the embodiment of the present invention, the drive signal input to the exciter is used as the first drive signal, and the drive signal input to the vibrator is used as the second drive signal. Drive signal, the functions of the signal calculation module and the signal sending module are as follows:

A signal calculation module for setting the second driving signal of the input vibrator according to the first driving signal of the input exciter;

The signal sending module is used to send the second driving signal to the vibrator,

In specific applications, the relationship between the first driving signal and the second driving signal is obtained by setting the parameters in the signal processor, so that the vibration response of the middle frame when the vibrator drives the middle frame to vibrate with the second driving signal, and the excitation The vibration response of the middle frame and/or the back cover cancels each other when the screen is driven by the first driving signal to vibrate and sound.

The embodiment of the present invention also shows the process of setting the parameters in the signal processor. The process of setting the parameters in the signal processor is implemented in the signal calculation module. In the embodiment of the present invention, the signal calculation module may It includes a first calculation unit, a second calculation unit, a third calculation unit, and a transfer function calculation unit. The functions of the above-mentioned units are as follows;

_{The first calculation unit is used to calculate the vibration response Y 1} (s) of the middle frame when the exciter drives the screen to vibrate and sound with the first driving signal;

_{The second calculation unit is used to calculate the vibration response Y 2} (s) of any position on the back cover when the exciter is not working and the vibrator drives the middle frame to vibrate with the second driving signal;

The third calculation unit is used to calculate the response Y(s) of any position on the middle frame of the exciter and the vibrator when the input signal is X(s);

The transfer function calculation unit is used to calculate the transfer function H(s) of the signal processor when the response Y(s) at any position of the middle frame is 0;

Among them, the signal processor with a transfer function of H(s) can make the vibrator respond to the vibration of the middle frame when the middle frame vibrates with the second driving signal, and the middle frame and the middle frame when the exciter drives the screen to vibrate and produce sound with the first driving signal. / Or the vibration response of the back cover cancels each other out.

In one embodiment, _{the calculation formula of the vibration response Y 1} (s) of the middle frame is:

Y ₁ (s) = X ₁ (s)·H ₁ (s), where X ₁ (s) is the input signal of the exciter, and H ₁ (s) is the system including the exciter, the middle frame and the vibration propagation path Transfer Function;

_{The calculation formula of the vibration response Y 2} (s) at any position on the back cover is:

Y ₂ (s) = X ₂ (s)·H ₂ (s), where X ₂ (s) is the input signal of the vibrator, and H ₂ (s) is the system including the vibrator, the middle frame and the vibration propagation path Transfer Function;

The calculation formula of the response Y(s) at any position on the middle frame is:

Y(s)=X(s)·H ₁ (s)+X(s)·H(s)·H ₂ (s), where H(s) is the transfer function of the signal processor, X(s) Is the first drive signal of the input exciter, X(s)·H(s) is the second drive signal of the input signal processor;

When the response Y(s) at any position of the middle frame is 0, the calculation formula of the transfer function H(s) of the signal processor is:

Example three

The embodiment of the present invention proposes the structure of another screen sounding device 20 based on the first embodiment above, including a screen 21, a back cover 22, a middle frame 23 placed between the screen 21 and the back cover 22, and an exciter 231 and vibrator 232.

In the embodiment of the present invention, the positional relationship among the screen 21, the back cover 22, the middle frame 23, and the exciter 231 is the same as that in the first embodiment, and will not be repeated here. However, the middle frame 23 is not fixed with the actuator The part includes multiple target positions 233. The vibrator 232 is placed on the target position 233, and the signal generator 234 is connected to each vibrator 232. Each vibrator 232 is responsible for the modeling and control of a target position 233. Each vibration The application method of the device 232 is the same as that of the first embodiment.

As shown in FIG. 4, the embodiment of the present invention exemplarily shows that the middle frame 23 is divided into four target positions 233, and each target position 233 is provided with a vibrator 232 to control the vibration at the target position 233. Therefore, when the vibration of the exciter 231 causes the screen 21 to vibrate and produce sound, the vibration cancellation area of the middle frame 23 can more effectively reduce the excess vibration caused by the vibration of the back cover 22.

Example four

As shown in FIG. 5, an embodiment of the present invention also provides a screen sounding method, which is applied to the screen sounding device in Embodiment 1 to Embodiment 3. The method includes but is not limited to the following steps:

S501: Obtain a first driving signal input to the exciter;

S502: Calculate a second driving signal input to the vibrator according to the first driving signal;

S503. Drive the vibrator by the second driving signal, so that the vibrator and the exciter perform synchronous reverse vibration to offset the vibration of the middle frame and/or the back cover.

In the above steps S501 to S503, by processing the drive signal input to the vibrator, the vibration of the exciter and the vibration of the middle frame and the vibration of the vibrator and the vibration of the middle frame are in an antiphase relationship, which can be achieved The effect of reducing the vibration of the middle frame also reduces the transmission of the vibration of the middle frame to the back cover, thereby achieving the purpose of reducing the excess vibration caused by the vibration of the back cover and improving the comfort of the user holding the mobile terminal for a long time.

The above-mentioned embodiments are only used to illustrate the technical solutions of the present invention, but not to limit them; although the foregoing embodiments have described the present invention in detail, those of ordinary skill in the art should understand that they can still compare the foregoing embodiments. The recorded technical solutions are modified, or some of the technical features are equivalently replaced; and these modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of the present invention, and should be included in this Within the scope of protection of the invention.

Claims (7)

1. A screen sound-producing device, comprising a screen, a back cover, a middle frame placed between the screen and the back cover, the screen and the back cover are respectively fixed on both sides of the middle frame to communicate with the The middle frame forms a cavity together; the middle frame is provided with an exciter fixed on the screen, and is characterized in that:

   A vibrator is also fixed on the middle frame, and the vibrator is placed between the middle frame and the back cover;

   The screen sound generating device further includes a signal processor electrically connected to the vibrator and the exciter;

   When the signal processor sends a first driving signal to the exciter to cause the screen to vibrate and produce sound, the signal processor simultaneously processes the first driving signal to obtain a second driving signal and sends it to the vibrator, so that The vibrator and the exciter perform synchronous reverse vibration to offset the vibration of the middle frame and/or the back cover.
2. The screen sounding device according to claim 1, wherein the signal processor comprises a signal calculation module and a signal transmission module;

   The signal calculation module is configured to set the second drive signal input to the vibrator according to the first drive signal input to the exciter;

   The signal sending module is configured to send the second driving signal to the vibrator, so that when the vibrator drives the middle frame to vibrate with the second driving signal, the middle frame and/or the The vibration response of the back cover and the vibration response of the middle frame and/or the back cover when the exciter drives the screen to vibrate with the first driving signal to produce sound.
3. 3. The screen sounding device according to claim 2, wherein the signal calculation module comprises a first calculation unit, a second calculation unit, a third calculation unit, and a transfer function calculation unit;

   _{The first calculation unit is configured to calculate the vibration response Y 1} (s) of the middle frame when the exciter drives the screen to vibrate and produce sound with the first driving signal;

   _{The second calculation unit is configured to calculate the vibration response Y 2} (s) at any position on the back cover when the exciter is not working and the vibrator drives the middle frame to vibrate with the second driving signal. );

   The third calculation unit is configured to calculate the response Y(s) of any position on the middle frame of the exciter and the vibrator when the input signal is X(s);

   The transfer function calculation unit is used to calculate the transfer function H(s) of the signal processor when the response Y(s) at any position of the middle frame is 0;

   The signal processor with the transfer function H(s) makes the vibration response of the middle frame and/or the back cover when the vibrator drives the middle frame to vibrate with the second driving signal, and When the exciter drives the screen to vibrate and sound with the first driving signal, the vibration responses of the middle frame and/or the back cover cancel each other out.
4. The screen sounding device according to claim 3, wherein the calculation formula of _{the vibration response Y 1 (s) of the middle frame is:}

   Y ₁ (s) = X ₁ (s)·H ₁ (s), where X ₁ (s) is the input signal of the exciter, and H ₁ (s) is the system including the exciter, the middle frame and the vibration propagation path Transfer Function;

   _{The calculation formula of the vibration response Y 2} (s) at any position on the back cover is:

   Y ₂ (s) = X ₂ (s)·H ₂ (s), where X ₂ (s) is the input signal of the vibrator, and H ₂ (s) is the system including the vibrator, the middle frame and the vibration propagation path Transfer Function;

   The calculation formula of the response Y(s) at any position on the middle frame is:

   Y(s)=X(s)·H ₁ (s)+X(s)·H(s)·H ₂ (s), where H(s) is the transfer function of the signal processor, X(s) Is the first drive signal of the input exciter, X(s)·H(s) is the second drive signal of the input signal processor;

   Then when the response Y(s) at any position of the middle frame is 0, the calculation formula of the transfer function H(s) of the signal processor is:

   
5. The screen sounding device according to claim 1, wherein the part of the middle frame where the exciter is not fixed includes a plurality of target positions;

   The vibrator is provided at each of the target positions.
6. 8. The screen sounding device of claim 1, wherein the vibrator is a z-direction vibration motor.
7. A screen sounding method, characterized by being applied to the screen sounding device according to any one of claims 1 to 6, comprising:

   Acquiring the first driving signal input to the exciter;

   Calculating a second driving signal input to the vibrator according to the first driving signal;

   The vibrator is driven by the second driving signal, so that the vibrator and the exciter perform synchronous reverse vibration to cancel the vibration of the middle frame and/or the back cover.

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