CN116156799A - Rear shell assembly, control method of rear shell assembly and mobile terminal - Google Patents

Abstract

The invention discloses a rear shell assembly, a control method of the rear shell assembly and a mobile terminal, wherein the rear shell assembly is used for the mobile terminal and comprises a rear shell body and a piezoelectric element, the rear shell body comprises an electrochromic part, and the electrochromic part is made of electrochromic materials; the piezoelectric element is arranged on the rear shell body, so that the piezoelectric element generates an electric signal when the rear shell body vibrates, and the piezoelectric element is electrically connected with the electrochromic part. The rear shell component provided by the embodiment of the invention has the effect of realizing passive electrochromic of the rear shell body.

Description

Rear shell assembly, control method of rear shell assembly and mobile terminal

Technical Field

The invention relates to the technical field of electronic equipment, in particular to a rear shell assembly, a control method of the rear shell assembly and a mobile terminal.

Background

At present, the mobile terminal introduces electrochromic materials on the rear cover, so that the function that the color of the rear cover gradually changes and even can jump and change along with the music rhythm is realized. For example, electrochromic materials are introduced into the rear cover of the mobile phone, so that the color of the rear cover of the mobile phone is changed. The principle of electrochromic back cover is that the back cover made of electrochromic material is loaded with driving electric signal by using power supply, when the electric signal reaches a certain voltage value, the color of the material is changed, i.e. the color is changed according to the size of the driving signal.

In the related art, the power supply of the electrochromic rear cover is the power supply of the mobile terminal, and under the condition that the mobile terminal is increasingly strict in power consumption, the use scene of the electrochromic rear cover is greatly limited, so that the user experience is affected.

Disclosure of Invention

The present invention aims to solve at least one of the technical problems in the related art to some extent.

To this end, embodiments of the present invention provide a backshell assembly to achieve passive electrochromic of the backshell.

The embodiment of the invention provides a control method of a rear shell component, which is used for realizing passive electrochromic of a rear shell.

The embodiment of the invention provides a mobile terminal to realize passive electrochromic of a rear shell of the mobile terminal.

The rear shell assembly is used for the mobile terminal and comprises a rear shell body and a piezoelectric piece, wherein the rear shell body comprises an electrochromic part, and the electrochromic part is made of electrochromic materials; the piezoelectric element is arranged on the rear shell body, so that the piezoelectric element generates an electric signal when the rear shell body vibrates, and the piezoelectric element is electrically connected with the electrochromic part.

According to the rear shell assembly, the piezoelectric piece generates a piezoelectric signal by utilizing the vibration of the rear shell body, the electrochromic part of the rear shell body is driven to change color by utilizing the electric signal generated by the piezoelectric piece, so that the passive electrochromic of the rear shell is realized, the battery power consumption of the mobile terminal with the rear shell assembly is saved, and the use scene of the electrochromic function of the mobile terminal is wider.

In some embodiments, the rear housing body includes an amplitude greater region and an amplitude lesser region, the amplitude greater region having an amplitude greater than an amplitude of the amplitude lesser region when the rear housing body vibrates, the piezoelectric member being disposed at the amplitude greater region.

In some embodiments, the rear case body has a battery area for corresponding to a battery of the mobile terminal, and the piezoelectric member is provided at the battery area.

In some embodiments, the piezoelectric element is disposed in the middle of the battery zone, or

The battery section has a proximal speaker portion for being disposed proximal to a speaker of the mobile terminal and a distal speaker portion for being disposed distal from the speaker of the mobile terminal, the piezoelectric element being disposed on the proximal speaker portion.

In some embodiments, the rear case body has a first inner surface and a first outer surface opposite in a thickness direction thereof, the piezoelectric member is a piezoelectric sheet having a second inner surface and a second outer surface opposite in the thickness direction of the rear case body, and the second outer surface is in contact with and connected to the first inner surface.

In some embodiments, the second outer surface is adhesively secured to the first inner surface.

In some embodiments, the rear housing body has a mounting slot within which at least a portion of the piezoelectric element is disposed.

In some embodiments, an amplifying circuit is further included, the amplifying circuit having an input and an output, the piezoelectric element being coupled to the input and the output being coupled to the electrochromic portion.

In some embodiments, the amplifying circuit is a voltage amplifying circuit.

In some embodiments, the rear housing body entirely forms the electrochromic portion.

In some embodiments, the piezoelectric element is made of piezoelectric ceramic or polyvinylidene fluoride.

The rear shell assembly according to the embodiment of the present invention is the rear shell assembly according to any one of the above embodiments, and the control method of the rear shell assembly includes the following steps:

controlling the piezoelectric element to generate an electric signal by utilizing the vibration of the rear shell body;

and controlling the electrochromic part of the rear shell body to change color by utilizing an electric signal generated by the piezoelectric element.

In some embodiments, the control method further comprises controlling the piezoelectric element to generate different electrical signals using different vibration amplitudes of the rear housing body, and controlling the electrochromic portion of the rear housing body to generate different color changes.

In some embodiments, when the rear case assembly includes an amplifying circuit, the control method further includes amplifying the electric signal generated by the piezoelectric element by using the amplifying circuit to obtain an amplified electric signal, and controlling the electrochromic portion of the rear case body to change color by using the amplified electric signal.

The control method of the rear shell component can realize the passive electrochromic effect of the rear shell.

The mobile terminal provided by the embodiment of the invention comprises a middle frame, a rear shell component and a loudspeaker, wherein the rear shell component is the rear shell component in any embodiment, and a cavity is defined between the middle frame and the rear shell body; the loudspeaker is arranged in the cavity, and the loudspeaker is a loudspeaker with an open back sound cavity, so that sound waves are utilized to drive the back shell body to vibrate when the loudspeaker is externally placed.

In some embodiments, the mobile terminal further includes a main board, the rear case body has a main board area corresponding to the main board, and the speaker is disposed corresponding to the main board area.

In some embodiments, the mobile terminal further includes a battery, the rear case body has a battery area corresponding to the battery, the piezoelectric element is disposed corresponding to the battery area, and a cavity between the battery area and the main board area is communicated.

Drawings

Fig. 1 is a schematic structural view of a rear housing assembly according to an embodiment of the present invention.

Fig. 2 is a control flow diagram of the rear housing assembly of an embodiment of the present invention.

Fig. 3 is a schematic perspective view of a mobile terminal with a cover removed according to an embodiment of the present invention.

Fig. 4 is a schematic cross-sectional structure of a mobile terminal according to an embodiment of the present invention.

Reference numerals:

a mobile terminal 100;

a rear case body 1; a chamber 101; an electrochromic portion 102; a first inner surface 103; a first outer surface 104; a battery region 105; a main board region 106;

a piezoelectric element 2; a second inner surface 201; a second outer surface 202;

a speaker 3;

a middle frame 4;

and a battery 5.

Detailed Description

Reference will now be made in detail to embodiments of the present invention, examples of which are illustrated in the accompanying drawings. The embodiments described below by referring to the drawings are illustrative and intended to explain the present invention and should not be construed as limiting the invention.

The following describes a rear case assembly of an embodiment of the present invention with reference to the drawings.

As shown in fig. 1, the rear case assembly of the embodiment of the present invention includes a rear case body 1 and a piezoelectric member 2. The rear housing body 1 comprises an electrochromic part 102, and the electrochromic part 102 is made of electrochromic materials. The piezoelectric element 2 is provided on the rear case body 1, and the piezoelectric element 2 is electrically connected to the electrochromic portion 102.

The piezoelectric element 2 can be understood as an element made of piezoelectric material. When the piezoelectric material is deformed under the action of external force, the positive and negative charge centers are not overlapped any more due to the relative displacement of positive and negative ions in the unit cell, so that the crystal is macroscopically polarized, the surface charge surface density of the crystal is equal to the projection of the polarization intensity on the surface normal direction, and different charges appear on the two end surfaces when the piezoelectric material is deformed under the action of pressure. That is, the piezoelectric element 2 generates an electrical signal when deformed, and the larger the deformation of the piezoelectric element 2, the larger the generated electrical signal, and vice versa.

The electrochromic portion 102 is made of electrochromic material, that is, the electrochromic portion 102 is made of electrochromic material. Among them, electrochromic materials are phenomena in which optical properties (reflectivity, transmittance, absorptivity, etc.) of the materials undergo stable and reversible color changes under the action of an applied electric signal, and are represented as reversible changes in color and transparency in appearance. When an electric signal is applied to the electrochromic portion 102 on the rear case body 1, the color of the electrochromic portion 102 changes, and the color of the electrochromic portion 102 changes according to the magnitude of the electric signal, and when the electric signal is stopped from being supplied to the electrochromic portion 102, the electrochromic portion 102 returns to its original state.

The piezoelectric element 2 is disposed on the rear housing body 1, so that internal stress generated when the rear housing body 1 vibrates acts on the piezoelectric element 2, and deforms the piezoelectric element 2, and internal charges are generated after the piezoelectric element 2 is deformed and accumulated on two opposite sides of the piezoelectric element 2 to form an electrical signal. For example, when a speaker of a mobile terminal is put out, sound pressure (sound wave) is radiated into a chamber of the mobile terminal, and the sound pressure shock acts on the rear case body 1 to generate resonance, thereby vibrating the rear case body 1 and further generating an electric signal on the piezoelectric element 2 provided on the rear case body 1.

The electrochromic portion 102 of the rear case body 1 is electrically connected to the piezoelectric member 2 such that the electric signal forms a current path with the electrochromic portion 102 of the rear case body 1, thereby causing the electrochromic portion 102 of the rear case body 1 to be discolored.

Thus, the rear case assembly of the embodiment of the present invention generates an electrical signal by driving the piezoelectric element 2 by the vibration of the rear case body 1, and drives the electrochromic portion 102 of the rear case body 1 to be discolored by the electrical signal, avoiding the use of a self-charging battery of the mobile terminal to drive the electrochromic portion, compared with the battery driving of the mobile terminal in the related art. Thus, the passive electrochromic of the rear housing body 1 can be realized, namely, the electrochromic function of the rear housing does not need to be driven by a self-charging battery of the mobile terminal, and the battery power consumption of the mobile terminal is saved. The electrochromic use scene of the backshell is wider, and the user experience is better.

Optionally, the piezoelectric element 2 is made of piezoelectric ceramic (pzt) or polyvinylidene fluoride (pvdf).

The performance of the piezoelectric ceramics (pzt) or the polyvinylidene fluoride (pvdf) is good, the electrochromic part 102 on the rear shell body 1 is driven more easily, and therefore the electrochromic use scene is wider and the user experience is better.

In some embodiments, the rear case body 1 includes an amplitude-larger region in which the piezoelectric element 2 is disposed and an amplitude-smaller region in which the amplitude of the amplitude-larger region is larger than the amplitude of the amplitude-smaller region when the rear case body 1 vibrates.

The piezoelectric element 2 is arranged in a region with larger amplitude, namely a region with larger sound pressure impact ratio, so that the piezoelectric element 2 can generate stronger electric signals when the rear housing body 1 vibrates, and the electrochromic part 102 can be better driven to change color by using the stronger electric signals.

For example, the region of the rear case body 1 where the amplitude is large may be determined by simulation or the like, and the piezoelectric element 2 may be provided in the region of the large amplitude.

Alternatively, the rear case body 1 has a battery area 105 for corresponding to a battery of the mobile terminal, and the piezoelectric member 2 is provided at the battery area 105.

By performing simulation on mobile terminals of different models, when the speaker of the mobile terminal is in play, the battery area 105 of most of the mobile terminals has larger amplitude, namely, the battery area 105 is the area with larger amplitude of the rear shell body 1. Therefore, the piezoelectric element 2 is provided in the battery region 105, so that the piezoelectric element 2 can generate a stronger electric signal when the rear case body 1 vibrates, and the electrochromic portion 102 can be driven better with the stronger electric signal to change color.

Alternatively, the piezoelectric element 2 is provided in the middle of the battery region 105. In other words, the piezoelectric element 2 is provided on the middle portion of the battery region 105.

In order to more clearly describe the technical solution of the present application, the following further describes the technical solution of the present application by taking the example that the thickness direction of the rear case body 1 coincides with the up-down direction, and the length direction of the rear case body 1 coincides with the left-right direction, wherein the up-down direction and the left-right direction are as shown in fig. 1.

For example, as shown in fig. 1, the piezoelectric element 2 is located below the rear case body 1, and the piezoelectric element 2 is located in the middle of the battery region 105 in the left-right direction.

In general, when the speaker of the mobile terminal is operated to be externally discharged, the amplitude generated in the middle of the battery area 105 is large. Thus, the piezoelectric element 2 is provided in the battery region 105, so that the piezoelectric element 2 can generate a stronger electric signal when the rear case body 1 vibrates, and the electrochromic portion 102 can be driven better to change color by the stronger electric signal.

In other embodiments, the battery compartment has a proximal speaker portion for placement adjacent to a speaker of the mobile terminal and a distal speaker portion for placement distal from the speaker of the mobile terminal, with the piezoelectric element being disposed on the proximal speaker portion.

For example, a left side portion of the battery area is adjacent to the speaker portion, a right side portion of the battery area is distant from the speaker portion, and the piezoelectric member is provided on the left side portion of the battery area.

The adjacent speaker portion of the battery compartment is closer to the speaker such that the adjacent speaker portion of the battery compartment produces a greater amplitude when the speaker is in play. Thus, the piezoelectric element is arranged on the part adjacent to the loudspeaker, so that the piezoelectric element can generate stronger electric signals when the rear shell body vibrates, and the electrochromic part can be better driven to change color by using the stronger electric signals.

Alternatively, the rear case body 1 has a first inner surface 103 and a first outer surface 104 opposed in the thickness direction thereof. The piezoelectric element 2 is a piezoelectric sheet having a second inner surface 201 and a second outer surface 202 opposed to each other in the thickness direction of the rear case body 1. The second outer surface 202 is in contact with and connected to the first inner surface 103.

For example, as shown in fig. 1, the rear case body 1 has a first inner surface 103 (upper surface) and a first outer surface 104 (lower surface) opposed in the up-down direction, and the piezoelectric element 2 has a second inner surface 201 (upper surface) and a second outer surface 202 (lower surface) opposed in the up-down direction. The first inner surface 103 is located above the second outer surface 202, and the upper surface of the piezoelectric element 2 is in contact with and connected to the lower surface of the rear case body 1.

Through setting up piezoelectric element 2 into the piezoelectricity piece, and piezoelectricity piece and backshell body 1 contact for piezoelectric element 2 can not influence the installation of other components in the cavity when setting up in the mobile terminal cavity, make mobile terminal overall structure compact, rationally distributed. In addition, the piezoelectric element 2 is configured as a piezoelectric sheet, so that the thickness of the piezoelectric element 2 is smaller, and when the rear case body 1 vibrates, the piezoelectric element 2 is more easily deformed, thereby further facilitating the piezoelectric element 2 to generate an electrical signal to drive the electrochromic portion 102.

Alternatively, the second outer surface 202 of the piezoelectric element 2 is bonded to the first inner surface 103 of the rear case body 1.

Thereby, the piezoelectric element 2 is more easily caused to generate a piezoelectric effect when the rear case body 1 vibrates to generate internal stress, and the electrochromic portion 102 is more preferably driven to change color.

Optionally, the second outer surface 202 is adhesively secured to the first inner surface 103. In other words, the second outer surface 202 is fixed to the first inner surface 103 by adhesion.

The second outer surface 202 is fixed to the first inner surface 103 by double-sided adhesive bonding, for example.

Therefore, the piezoelectric element 2 is conveniently fixed on the rear shell body 1, so that the assembly of the rear shell assembly is convenient, and the cost of the mobile terminal with the rear shell assembly is reduced.

In other embodiments, the rear housing body has a mounting slot in which at least a portion of the piezoelectric element is disposed.

For example, a mounting groove with a notch on the first inner surface is arranged on the rear shell body, one part of the piezoelectric element is embedded in the mounting groove, and the other part of the piezoelectric element is positioned in the cavity of the mobile terminal; for another example, a mounting groove (through groove) penetrating the first inner surface and the first outer surface is provided in the rear case body, and a part of the piezoelectric element is fitted into the mounting groove and another part of the piezoelectric element is located in the cavity of the mobile terminal.

Therefore, the contact area between the piezoelectric element and the rear shell body is larger, the contact is tighter, the piezoelectric element is easier to generate a piezoelectric effect when the rear shell body vibrates to generate internal stress, and the piezoelectric element is better utilized to drive the electrochromic part to generate color change.

Alternatively, the rear case body 1 (electrochromic rear cover) entirely forms the electrochromic portion 102. In other words, the entire rear case body 1 is made of electrochromic material.

The rear case body 1 entirely forms the electrochromic portion 102, and on the one hand, processing of the rear case body 1 is facilitated. On the other hand, when the loudspeaker is put out to work, and the piezoelectric element 2 drives the electrochromic part 102 to change in color, the color of the whole rear shell body 1 is changed, so that the color-changing area of the rear shell body 1 is larger, better visual experience can be provided for a user, and further improvement of the user experience is facilitated.

In other implementations, a portion of the rear housing body 1 is an electrochromic portion 102 and another portion of the rear housing body 1 is a non-electrochromic portion.

The non-electrochromic part is made of common materials and cannot change color under the action of an electric signal.

For example, the rim portion of the rear case body 1 is set as an electrochromic portion 102, and the other portions of the rear case body 1 are set as non-electrochromic portions. At this time, when the piezoelectric element 2 drives the electrochromic portion 102 to change color, the rear case body 1 changes color only at the edge portion. Alternatively, the electrochromic portions 102 are arranged in a specific pattern, and at this time, when the piezoelectric member 2 drives the electrochromic portions 102 to change color, only the pattern portions are discolored, so that the specific pattern formed on the rear case body 1 is presented to the user. Better visual experience is provided for the user, and the user experience is further improved.

In some embodiments, as shown in fig. 2, the rear housing assembly of the embodiment of the present invention further includes an amplifying circuit having an input terminal to which the piezoelectric element 2 is connected and an output terminal to which the electrochromic portion 102 is connected.

Specifically, in the working process, the electric signal generated by the piezoelectric element 2 is input to the amplifying circuit through the input end, the electric signal is amplified by the amplifying circuit to obtain an amplified electric signal, the amplified electric signal is output to the electrochromic part 102, and the amplified electric signal is used for driving the electrochromic part 102 to change color.

Therefore, the electric signal generated by the piezoelectric element 2 is used for more easily driving the electrochromic part 102 to change color, so that more parts of the electrochromic part 102 and even all the electrochromic part 102 can be changed in color, the passive electrochromic of the rear shell is better realized, the electrochromic function of the rear shell is wider in use scene, and the user experience is better.

Optionally, the amplifying circuit is a voltage amplifying circuit.

By setting the amplifying circuit as a voltage amplifying circuit, the voltage of the electric signal generated by the piezoelectric element 2 is larger, which is more beneficial to driving the electrochromic part 102 to change color, so that the electrochromic function of the rear shell has wider use scene and better user experience.

As shown in fig. 3, the control method of the rear housing assembly according to the embodiment of the invention includes the following steps:

firstly, the vibration of the rear shell body 1 is utilized to control the piezoelectric element 2 to generate an electric signal;

thereafter, the electrochromic portion 102 of the rear case body 1 is controlled to change color by an electric signal generated by the piezoelectric element 2.

For example, the speaker of the mobile terminal is externally placed such that the speaker radiates sound pressure into the chamber of the mobile terminal, and the sound pressure impact acts on the rear case body 1 to form resonance, so that the rear case body 1 vibrates, thereby controlling the piezoelectric member 2 to generate an electrical signal by using the vibration of the rear case body 1, and controlling the electrochromic portion 102 of the rear case body 1 to change color by using the electrical signal.

In the above-mentioned control method, when the vibration amplitudes of the rear case body 1 are different, the control method further includes using the vibration amplitudes of the rear case body 1 to control the piezoelectric element 2 to generate different electrical signals, and controlling the electrochromic portion 102 of the rear case body 1 to generate different color changes.

For example, the different frequencies of the sound emitted from the speaker control the different vibration amplitudes of the rear case body 1, so that the different vibration amplitudes of the rear case body 1 can be used to control the piezoelectric element 2 to generate different electric signals.

In the above-mentioned control method, when the rear case assembly includes an amplifying circuit, the control method further includes amplifying the electric signal generated by the piezoelectric element 2 by using the amplifying circuit to obtain an amplified electric signal, and controlling the electrochromic portion 102 of the rear case body 1 to change color by using the amplified electric signal.

The mobile terminal according to the embodiment of the present invention is described below with reference to the accompanying drawings.

As shown in fig. 1 to 4, the mobile terminal 100 of the embodiment of the present invention includes a center 4, a rear case assembly, and a speaker 3.

The rear housing assembly is the rear housing assembly according to any of the above embodiments, a chamber 101 is defined between the middle frame 4 and the rear housing body 1, the speaker 3 is disposed in the chamber 101, and the speaker 3 is a speaker with an open rear sound cavity, so that when the speaker 3 is placed outside, the rear housing body 1 is driven to vibrate by sound waves, so that the piezoelectric element 2 generates an electrical signal.

The speaker 3 is an open rear sound chamber speaker can be understood as: the speaker 3 is a speaker without a separate rear sound chamber, i.e. the rear side of the speaker 3 is open, so that the chamber 101 constitutes the rear chamber of the speaker 3. When the speaker 3 is externally placed, the speaker 3 radiates sound pressure to the chamber 101, and the sound pressure shock acts on the rear case body 1 to resonate, that is, a case vibration phenomenon.

When the mobile terminal 100 of the embodiment of the invention is put out and operated by the loudspeaker 3, the loudspeaker 3 radiates sound pressure to the cavity 101 defined by the middle frame 4 and the rear housing body 1, and the sound pressure is coupled with the rear housing body 1 to form resonance, so that the rear housing body 1 vibrates, and the piezoelectric element 2 generates an electric signal for driving the electrochromic part 102 to change color. Compared with the electrochromic part driven by the battery of the mobile terminal to realize electrochromic in the related art, the use of the battery of the mobile terminal 100 to drive the electrochromic part is avoided, so that the passive electrochromic of the rear shell of the mobile terminal 100 can be realized, namely, the electrochromic function of the rear shell does not need to be driven by the self-charging battery of the mobile terminal, and the battery power consumption of the mobile terminal is saved. The electrochromic use scene of the backshell is wider, and the user experience is better.

Further, the amplitude of the rear case body 1 may be changed according to the sound emission frequency of the speaker 3. For example, when the speaker 3 is playing music, and the sound emission frequency of the speaker 3 is changed, the sound pressure of the speaker 3 radiated to the chamber 101 is changed with the change of the sound emission frequency, so that the amplitude of the rear case body 1 is changed with the change of the sound pressure. Therefore, the piezoelectric element 2 deforms differently along with the change of the amplitude of the rear housing body 1, the magnitude of the electrical signal generated by the different deformation of the piezoelectric element 2 is also different, and the electrochromic part 102 generates jump change according to the magnitude of the received electrical signal. Compared with the battery-driven mobile terminal with the electrochromic in the related art, which only presents a single effect of gradual color change, the electrochromic part 102 of the rear shell of the mobile terminal 100 of the embodiment of the invention presents a more cool effect, and the user experience is better.

Therefore, the mobile terminal provided by the embodiment of the invention can realize the passive electrochromic of the rear shell, so that the electrochromic function of the rear shell is not limited by the battery of the mobile terminal, and the use scene of the electrochromic function of the rear shell is wide and the user experience is good.

Optionally, the mobile terminal may be an electroacoustic terminal such as a mobile phone, a tablet computer, a notebook or a television.

Alternatively, the mobile terminal 100 includes a main board (not shown in the drawings) and a battery 5, the rear case body 1 has a main board region 106 corresponding to the main board, the speaker 3 is disposed corresponding to the main board region 106, the piezoelectric member 2 is disposed corresponding to the battery region 106, and a cavity between the main board region 106 and the battery region 105 communicates.

At this time, the speaker 3 is a speaker with an open rear sound chamber, which can be understood as: the rear cavity of the speaker 3 includes not only the cavity portion corresponding to the main board region 106, but also the cavity portion corresponding to the battery region 105, that is, the cavity portion corresponding to the battery region 105 and the cavity portion corresponding to the main board region 106 are both part of the chamber 101. Thereby, it is convenient to transmit the sound pressure generated by the speaker 3 at the main board region 106 to the piezoelectric element 2 at the battery region 105. In addition, the speaker 3 is disposed corresponding to the motherboard region 106, so that the speaker 3 is closer to the motherboard of the mobile terminal 100, so that the speaker 3 is connected with the motherboard, thereby facilitating the assembly and lightweight design of the mobile terminal 100.

Alternatively, the main board region 106 and the battery region 105 are spaced apart in the length direction of the mobile terminal 100. In other words, the speaker 3 is spaced apart from the battery 5 in the length direction of the mobile terminal 100.

The thickness direction of the mobile terminal 100 coincides with the thickness direction (up-down direction) of the rear case body 1, and the length direction of the mobile terminal 100 coincides with the length direction (left-right direction) of the rear case body 1, wherein the up-down direction and the left-right direction are as shown in fig. 3 and 4.

For example, as shown in fig. 3 and 4, the mobile terminal 100 is a mobile phone, and the main board area 106 is located on the left side of the battery area 105, in other words, the speaker 3 is located on the left side of the battery 5. And the speaker 3 is provided at the top (left end portion) of the mobile terminal 100, and the battery 5 is provided at the middle of the mobile terminal 100 so that the speaker 3 is powered by the power supply 5.

Thus, there is no overlapping portion of the speaker 3 and the battery 5 in the length direction of the mobile terminal 100, which is advantageous in reducing the thickness of the mobile terminal 100.

Alternatively, the piezoelectric element 2 is located between the rear case body 1 and the battery 5 in the up-down direction, and the lower surface of the piezoelectric element 2 is spaced apart from the upper surface of the battery 5 in the up-down direction.

This prevents the piezoelectric element 2 from interfering with the upper surface of the battery 5 when the rear case body 1 vibrates and deforms, and thus, the magnitude of the electrical signal generated by the piezoelectric element 2 is prevented from being affected.

When the rear case assembly includes an amplifying circuit, the amplifying circuit may be a passive amplifying circuit or an active amplifying circuit. When the amplifying circuit is a passive amplifying circuit, an amplifying circuit can be formed by a plurality of passive electrical components, an electric signal generated by the piezoelectric element is amplified and then output to the electrochromic part, and a direct-current high voltage generated by the piezoelectric element can be used for driving materials of the electrochromic part to light up, so that passive driving of electrochromic is formed. The amplitude of the shell vibration can be changed along with the sounding frequency of the loudspeaker, and the magnitude of the electric signal generated by the piezoelectric element is also changed continuously, so that the electrochromic rear cover can jump along with music. Therefore, the power consumption of the whole electrochromic speaker can be reduced, and shell vibration caused by sounding of the open back cavity speaker can be effectively utilized.

When the amplifying circuit is an active amplifying circuit, the amplifying circuit is connected to the battery 5, and the battery 5 is used to supply power to the amplifying circuit, and the above-mentioned "passive electrochromic" can be understood that the electrical signal for driving the electrochromic portion 102 to change color is not directly supplied by the battery 5, but is supplied by the piezoelectric effect of the piezoelectric element 2. But does not represent the addition of a battery-free circuit between the piezoelectric element 2 and the electrochromic portion 102, i.e., the circuit between the piezoelectric element 2 and the electrochromic portion 102 may or may not be connected to the battery 5, and only the electrical signal for driving the color change of the electrochromic portion 102 need be derived from the casing of the piezoelectric element 2. Although the above-described amplifying circuit uses the battery 5 of the mobile terminal 100, the addition of the battery 5 of the mobile terminal 100 only plays a role of amplifying the electric signal generated by the piezoelectric element 2, and is not directly used for driving the electrochromic portion 102 to change color, i.e., the battery 5 of the mobile terminal 100 is not used as a driving power source for the electrochromic portion 102. In addition, the amplifying circuit consumes little electric energy in the working process, and even if the battery 5 is used for providing electric energy for the amplifying circuit, the electric energy consumed by the electrochromic rear cover in the related art directly driven by the battery is far smaller than that consumed by the electrochromic rear cover.

The control method of the mobile terminal 100 according to the embodiment of the present invention includes driving the rear case body 1 to vibrate by sound pressure radiated to the chamber 101 when the speaker 3 is externally placed; the vibration of the rear shell body 1 is used for controlling the piezoelectric element 2 to generate an electric signal; thereafter, the electrochromic portion 102 of the rear case body 1 is controlled to change color by an electric signal generated by the piezoelectric element 2.

According to the mobile terminal 100 provided by the embodiment of the invention, the rear shell body 1 is vibrated by utilizing the sound pressure of the radiation emitted by the loudspeaker 3, the piezoelectric element 2 is enabled to generate a piezoelectric signal by utilizing the vibration of the rear shell body 1, and the electrochromic part 102 of the rear shell body 1 is driven to change in color by utilizing the electric signal generated by the piezoelectric element 2, so that the passive driving of the electrochromic part 102 is realized. The electrochromic part 102 on the rear shell is lightened by passive driving, so that shell vibration brought to the mobile terminal 100 when a loudspeaker of an open rear sound cavity sounds is effectively utilized, and the overall power consumption of electrochromic application is reduced. In addition, since the amplitude of the shell vibration will change with the sounding frequency of the speaker 3, the magnitude of the electrical signal generated by the piezoelectric element 2 also changes continuously, so that the electrochromic portion 102 of the rear shell body 1 will jump along with the music, and a novel use experience is provided for the user.

In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc. indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings are merely for convenience in describing the present invention and simplifying the description, and do not indicate or imply that the device or element being referred to must have a specific orientation, be configured and operated in a specific orientation, and therefore should not be construed as limiting the present invention.

Furthermore, the terms "first," "second," and the like, are used for descriptive purposes only and are not to be construed as indicating or implying a relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defining "a first" or "a second" may explicitly or implicitly include at least one such feature. In the description of the present invention, the meaning of "plurality" means at least two, for example, two, three, etc., unless specifically defined otherwise.

In the present invention, unless explicitly specified and limited otherwise, the terms "mounted," "connected," "secured," and the like are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally formed; may be mechanically connected, may be electrically connected or may be in communication with each other; either directly or indirectly, through intermediaries, or both, may be in communication with each other or in interaction with each other, unless expressly defined otherwise. The specific meaning of the above terms in the present invention can be understood by those of ordinary skill in the art according to the specific circumstances.

In the present invention, unless expressly stated or limited otherwise, a first feature "up" or "down" a second feature may be the first and second features in direct contact, or the first and second features in indirect contact via an intervening medium. Moreover, a first feature being "above," "over" and "on" a second feature may be a first feature being directly above or obliquely above the second feature, or simply indicating that the first feature is level higher than the second feature. The first feature being "under", "below" and "beneath" the second feature may be the first feature being directly under or obliquely below the second feature, or simply indicating that the first feature is less level than the second feature.

For purposes of this disclosure, the terms "one embodiment," "some embodiments," "example," "a particular example," or "some examples," etc., mean that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the invention. In this specification, schematic representations of the above terms are not necessarily directed to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples. Furthermore, the different embodiments or examples described in this specification and the features of the different embodiments or examples may be combined and combined by those skilled in the art without contradiction.

While embodiments of the present invention have been shown and described above, it will be understood that the above embodiments are illustrative and not to be construed as limiting the invention, and that variations, modifications, alternatives and variations may be made to the above embodiments by one of ordinary skill in the art within the scope of the invention.

Claims (17)

1. A rear housing assembly for a mobile terminal, comprising:

the rear shell comprises a rear shell body, wherein the rear shell body comprises an electrochromic part, and the electrochromic part is made of electrochromic materials; and

the piezoelectric piece is arranged on the rear shell body, so that the piezoelectric piece generates an electric signal when the rear shell body vibrates, and the piezoelectric piece is electrically connected with the electrochromic part.

2. The backshell assembly of claim 1, wherein the backshell body includes a region of greater amplitude and a region of lesser amplitude, the region of greater amplitude having a greater amplitude when the backshell body vibrates than the region of lesser amplitude, the piezoelectric member disposed in the region of greater amplitude.

3. The rear case assembly according to claim 1, wherein the rear case body has a battery area for corresponding to a battery of the mobile terminal, and the piezoelectric member is provided at the battery area.

4. A rear housing assembly according to claim 3, wherein the piezoelectric element is provided in the middle of the battery region, or

The battery section has a proximal speaker portion for being disposed proximal to a speaker of the mobile terminal and a distal speaker portion for being disposed distal from the speaker of the mobile terminal, the piezoelectric element being disposed on the proximal speaker portion.

5. The backshell assembly according to any one of claims 1 to 4, wherein the backshell body has first and second inner surfaces opposite in a thickness direction thereof, the piezoelectric element being a piezoelectric sheet having second and second outer surfaces opposite in a thickness direction of the backshell body, the second outer surface being in contact with and contiguous with the first inner surface.

6. The backshell assembly according to claim 5, wherein the second outer surface is adhesively secured to the first inner surface.

7. The backshell assembly according to any one of claims 1 to 4, wherein the backshell body has a mounting slot within which at least a portion of the piezoelectric member is disposed.

8. The backshell assembly according to any one of claims 1 to 4, further comprising:

the amplifying circuit is provided with an input end and an output end, the piezoelectric element is connected with the input end, and the output end is connected with the electrochromic part.

9. The backshell assembly according to claim 8, wherein the amplifying circuit is a voltage amplifying circuit.

10. The backshell assembly according to any one of claims 1 to 4, wherein the backshell body entirely forms the electrochromic portion.

11. The backshell assembly according to any one of claims 1 to 4, wherein the piezoelectric member is a piezoelectric ceramic or polyvinylidene fluoride.

12. A control method of a rear housing assembly, characterized in that the rear housing assembly is a rear housing assembly according to any one of claims 1 to 11, the control method comprising the steps of:

controlling the piezoelectric element to generate an electric signal by utilizing the vibration of the rear shell body;

and controlling the electrochromic part of the rear shell body to change color by utilizing an electric signal generated by the piezoelectric element.

13. The control method of a rear housing assembly according to claim 12, further comprising:

the piezoelectric element is controlled to generate different electric signals by utilizing different vibration amplitudes of the rear shell body, and the electrochromic part of the rear shell body is controlled to generate different color changes.

14. The control method of a rear case assembly according to claim 12 or 13, wherein when the rear case assembly includes an amplifying circuit, the control method further includes:

and amplifying the electric signal generated by the piezoelectric element by using the amplifying circuit to obtain an amplified electric signal, and controlling the electrochromic part of the rear shell body to change color by using the amplified electric signal.

15. A mobile terminal, comprising:

a middle frame;

a rear housing assembly as claimed in any one of claims 1 to 11, the centre frame and the rear housing body defining a chamber therebetween; and

and the loudspeaker is arranged in the cavity and is a loudspeaker with an open back sound cavity, so that the back shell body is driven to vibrate by sound waves when the loudspeaker is externally placed.

16. The mobile terminal of claim 15, wherein the mobile terminal further comprises:

the main board is arranged on the rear shell body, the rear shell body is provided with a main board area corresponding to the main board, and the loudspeaker is arranged corresponding to the main board area.

17. The mobile terminal of claim 16, wherein the mobile terminal further comprises:

the battery, the backshell body have with the battery district that the battery corresponds, the piezoelectricity piece corresponds the battery district sets up, the battery district with cavity intercommunication between the mainboard district.

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