Drive circuits and electronic devices

Abstract

This disclosure relates to a driving circuit and an electronic device. The driving circuit includes: a voltage conversion circuit, the input terminal of which is electrically connected to an input power supply, and the voltage conversion circuit converts a first voltage of the input power supply into a second voltage; and a gating circuit, the first terminal of which is electrically connected to the output terminal of the voltage conversion circuit, the second terminal of which is electrically connected to the first input terminal of an electrochromic film, and the third terminal of which is electrically connected to the second input terminal of the electrochromic film. The gating circuit is used to select whether the output terminal of the voltage conversion circuit is connected to the first or second input terminal, thereby driving the electrochromic film with a positive or negative second voltage. Because the voltage conversion circuit and the gating circuit have simple structures, they are easy to install in electronic devices to drive the electrochromic film bipolarly, thereby reducing the size of the electronic device.

Description

Technical Field

[0001] This disclosure relates to the field of drive technology, and in particular to a drive circuit and electronic device. Background Technology

[0002] Electrochromic films are materials that exhibit electrochromic properties; their optical properties change when the driving voltage of the film changes. However, because electrochromic films require bipolar driving circuits, the structure of these circuits is complex, which affects the size of electronic devices when installed in them. Utility Model Content

[0003] To overcome the problems existing in the related technologies, this disclosure provides a driving circuit and an electronic device.

[0004] According to a first aspect of this disclosure, a driving circuit is provided, the driving circuit comprising:

[0005] A voltage conversion circuit, wherein the input terminal of the voltage conversion circuit is used to be electrically connected to an input power supply, and the voltage conversion circuit is used to convert a first voltage of the input power supply into a second voltage;

[0006] A gating circuit is provided, wherein a first terminal of the gating circuit is electrically connected to the output terminal of the voltage conversion circuit, a second terminal of the gating circuit is electrically connected to the first input terminal of the electrochromic film, and a third terminal of the gating circuit is electrically connected to the second input terminal of the electrochromic film. The gating circuit is used to select whether the output terminal of the voltage conversion circuit is connected to the first input terminal or the second input terminal, so as to drive the electrochromic film with a positive or negative second voltage.

[0007] In some embodiments of this disclosure, the fourth terminal of the gating circuit is used to be electrically connected to the ground terminal, and the gating circuit is also used to select whether the ground terminal is connected to the second input terminal or the first input terminal.

[0008] In some embodiments of this disclosure, the gating circuit includes:

[0009] A first switch, wherein a first selection terminal of the first switch is electrically connected to the output terminal of the voltage conversion circuit, a second selection terminal of the first switch is electrically connected to the ground terminal, and a fixed terminal of the first switch is electrically connected to the first input terminal;

[0010] A second switch, wherein a first selection terminal of the second switch is electrically connected to the ground terminal, a second selection terminal of the second switch is electrically connected to the output terminal of the voltage conversion circuit, and a fixed terminal of the second switch is electrically connected to the second input terminal; or,

[0011] The third switch has a fixed terminal that is electrically connected to the output terminal of the voltage conversion circuit, a first selection terminal that is electrically connected to the first input terminal, and a second selection terminal that is electrically connected to the second input terminal.

[0012] The fourth switch has a fixed terminal for electrical connection to the ground terminal, a first selection terminal for electrical connection to the first input terminal, and a second selection terminal for electrical connection to the second input terminal.

[0013] In some embodiments of this disclosure, the voltage conversion circuit includes a buck circuit, a boost circuit, or a buck-boost circuit.

[0014] In some embodiments of this disclosure, the voltage conversion circuit is located in the power management circuit of the electronic device.

[0015] In some embodiments of this disclosure, the driving circuit further includes:

[0016] A control circuit, wherein the first terminal of the control circuit is electrically connected to the control terminal of the voltage conversion circuit, and the control circuit is used to control the operation of the voltage conversion circuit.

[0017] In some embodiments of this disclosure, the second terminal of the control circuit is electrically connected to the fifth terminal of the gating circuit, and the control circuit is further configured to control the gating circuit to select whether the output terminal of the voltage conversion circuit is connected to the first input terminal or the second input terminal.

[0018] In some embodiments of this disclosure, the third terminal of the control circuit is electrically connected to the output terminal of the voltage conversion circuit, and the control circuit is also used to detect the voltage of the first input terminal or the second input terminal.

[0019] In some embodiments of this disclosure, the driving circuit further includes:

[0020] An analog-to-digital converter (ADC) circuit is provided, wherein a first input terminal of the ADC circuit is electrically connected to the first input terminal, a second input terminal of the ADC circuit is electrically connected to the second input terminal, and a third terminal of the ADC circuit is electrically connected to the first terminal of the control circuit. The ADC circuit is used to convert the voltages of the first input terminal and the second input terminal from analog signals to digital signals and then transmit them to the control circuit.

[0021] According to a second aspect of this disclosure, an electronic device is provided, the electronic device including the driving circuit described above.

[0022] In some embodiments of this disclosure, the electronic device further includes the electrochromic film and a flash lamp, the driving circuit is electrically connected to the electrochromic film, and the electrochromic film forms the lampshade of the flash lamp.

[0023] In some embodiments of this disclosure, the electronic device further includes the electrochromic film and a lens, the driving circuit is electrically connected to the electrochromic film, and the electrochromic film covers the lens.

[0024] The technical solutions provided by the embodiments of this disclosure may include the following beneficial effects:

[0025] The driving circuit includes a voltage conversion circuit and a gating circuit. The voltage conversion circuit is electrically connected between the input power supply and the gating circuit, while the gating circuit is electrically connected between the voltage conversion circuit and the electrochromic film. Due to the simple structure of the voltage conversion circuit and the gating circuit, they are easy to install in electronic devices to drive the electrochromic film bipolarly, thereby reducing the size of the electronic device. Furthermore, the small size of the driving circuit allows the electrochromic film to be used in smaller, more integrated electronic devices, thus expanding its application range. Moreover, because the voltage conversion circuit can convert the first voltage of the input power supply, it can selectively provide different second voltages to the electrochromic film, enabling the electrochromic film to achieve different optical properties and improving the user experience.

[0026] It should be understood that the above general description and the following detailed description are exemplary and explanatory only, and are not intended to limit this disclosure. Attached Figure Description

[0027] The accompanying drawings, which are incorporated in and form part of this specification, illustrate embodiments consistent with the present invention and, together with the description, serve to explain the principles of the present invention.

[0028] Figure 1 This is a schematic diagram of the structure of a driving circuit provided in an exemplary embodiment of the present disclosure;

[0029] Figure 2 This is a schematic diagram showing the relationship between voltage and transparency of an electrochromic film.

[0030] Figure 3 A schematic diagram of the structure of a driving circuit is provided in another exemplary embodiment of this disclosure;

[0031] Figure 4 A schematic diagram of the structure of a driving circuit is provided in another exemplary embodiment of this disclosure;

[0032] Figure 5 A schematic diagram of the structure of a driving circuit is provided in another exemplary embodiment of this disclosure;

[0033] Figure 6 A schematic diagram of the structure of a driving circuit is provided in another exemplary embodiment of this disclosure;

[0034] Figure 7 A schematic diagram of the structure of a driving circuit is provided in another exemplary embodiment of this disclosure;

[0035] Figure 8 A schematic diagram of the structure of a driving circuit is provided in another exemplary embodiment of this disclosure;

[0036] Figure 9 A schematic diagram of the structure of a driving circuit is provided in another exemplary embodiment of this disclosure;

[0037] Figure 10 A schematic diagram of the structure of a driving circuit is provided in another exemplary embodiment of this disclosure;

[0038] Figure 11 This is a system block diagram of an electronic device provided in an exemplary embodiment of the present disclosure.

[0039] In the picture:

[0040] 10-Voltage conversion circuit; 20-Gating circuit; 21-First switch; 22-Second switch; 23-Third switch; 24-Fourth switch; 30-Electrochromic film; 40-Control circuit; 50-Analog-to-digital conversion circuit; 400-Electronic equipment; 402-Processing component; 404-Memory; 406-Power supply component; 408-Multimedia component; 410-Audio component; 412-Input / output interface; 414-Sensor component; 416-Communication component; 420-Processor; GND-Ground terminal; Vin-Input power supply; PMIC-Power management circuit; AP-Application processor. Detailed Implementation

[0041] Exemplary embodiments will now be described in detail, examples of which are illustrated in the accompanying drawings. When the following description relates to the drawings, unless otherwise indicated, the same numbers in different drawings denote the same or similar elements. The embodiments described in the following exemplary embodiments do not represent all embodiments consistent with this invention. Rather, they are merely examples of apparatuses and methods consistent with some aspects of this invention as detailed in the appended claims. It should also be understood that the term “and / or” as used herein refers to and includes any or all possible combinations of one or more of the associated listed items.

[0042] Electrochromic films are materials with electrochromic properties; their optical properties change when the driving voltage changes. This characteristic makes electrochromic films widely used in various fields, such as aerospace, automotive, and smart buildings. Regarding the transparency of electrochromic films, applying a positive voltage increases their transparency, while applying a negative voltage decreases it. To fully utilize this property, bipolar driving circuits are typically used. These circuits can output either a positive or negative voltage to the electrochromic film. However, due to the complexity of the driving circuit structure, it is difficult to find sufficient space to accommodate the driving circuit when applying electrochromic films to highly integrated small electronic devices, thus limiting their application and affecting the size of the devices.

[0043] Based on this, this disclosure provides a driving circuit that, by requiring only a small space to accommodate the voltage conversion circuit and the gating circuit in the electronic device, can meet the driving requirements of the electrochromic film. This allows the electrochromic film to be used in highly integrated small electronic devices, expanding its application range and reducing the size of the electronic device. Furthermore, because the voltage conversion circuit can convert the first voltage of the input power supply, it can selectively provide different second voltages to the electrochromic film, enabling the electrochromic film to achieve different optical properties and improving the user experience.

[0044] An exemplary embodiment of this disclosure provides a driving circuit, such as Figure 1 As shown, the driving circuit includes a voltage conversion circuit 10 and a gating circuit 20. The input terminal of the voltage conversion circuit 10 is electrically connected to the input power supply Vin, and the voltage conversion circuit 10 converts a first voltage of the input power supply Vin into a second voltage. The first terminal of the gating circuit 20 is electrically connected to the output terminal of the voltage conversion circuit 10, the second terminal of the gating circuit 20 is electrically connected to the first input terminal of the electrochromic film 30, and the third terminal of the gating circuit 20 is electrically connected to the second input terminal of the electrochromic film 30. The gating circuit 20 is used to select whether the output terminal of the voltage conversion circuit 10 is connected to the first or second input terminal, thereby driving the electrochromic film 30 with a positive or negative second voltage.

[0045] In this embodiment, the driving circuit includes a voltage conversion circuit and a gating circuit. The voltage conversion circuit is electrically connected between the input power supply and the gating circuit, and the gating circuit is electrically connected between the voltage conversion circuit and the electrochromic film. Because the voltage conversion circuit and the gating circuit have simple structures, they are easy to install in electronic devices to bipolarly drive the electrochromic film, thereby reducing the size of the electronic device. Furthermore, the small size of the driving circuit allows the electrochromic film to be used in smaller, more integrated electronic devices, thus expanding the application range of the electrochromic film. Moreover, because the voltage conversion circuit can convert the first voltage of the input power supply, it can selectively provide different second voltages to the electrochromic film, enabling the electrochromic film to achieve different optical performances and improve the user experience.

[0046] For example, such as Figure 2 As shown, when the driving voltage of the electrochromic film 30 is less than 0, the transparency is less than 50%. When the driving voltage of the electrochromic film 30 is equal to 0, the transparency is 50%. When the driving voltage of the electrochromic film 30 is greater than 0, the transparency is greater than 50%. Therefore, the amplitude of the second voltage output by the voltage conversion circuit 10 and the polarity of the second voltage output to the electrochromic film 30 can be adjusted according to the required transparency of the electrochromic film 30.

[0047] For example, to achieve a transparency of 75% or higher for the electrochromic film 30, the second voltage output by the voltage conversion circuit 10 needs to be greater than 1V. After the voltage conversion circuit 10 stops outputting the second voltage, the voltage of the electrochromic film 30 will slowly decrease, maintaining a transparency of 75% or higher for a period of time. To achieve a transparency of less than 10% for the electrochromic film 30, the second voltage output by the voltage conversion circuit 10 needs to be greater than 0.8V. After the voltage conversion circuit 10 stops outputting the second voltage, the voltage of the electrochromic film 30 will slowly increase, maintaining a transparency of less than 10% for a period of time.

[0048] In one embodiment, such as Figure 3 As shown, the fourth terminal of the gating circuit 20 is electrically connected to the ground terminal GND. The gating circuit 20 is also used to select whether the ground terminal GND is connected to the second input terminal or the first input terminal.

[0049] In this embodiment, when the selector circuit connects the ground terminal to the second input terminal, the voltage conversion circuit, the first terminal of the selector circuit, the second terminal of the selector circuit, the electrochromic film, the fourth terminal of the selector circuit, and the ground terminal form a current loop, allowing the selector circuit to drive the electrochromic film with a positive second voltage. When the selector circuit connects the ground terminal to the first input terminal, the voltage conversion circuit, the first terminal of the selector circuit, the third terminal of the selector circuit, the electrochromic film, the fourth terminal of the selector circuit, and the ground terminal form a current loop, allowing the selector circuit to drive the electrochromic film with a negative second voltage. By selectively connecting the ground terminal to either the second or first input terminal through the selector circuit, the polarity of the second voltage can be adjusted, enabling the electrochromic film to achieve different optical properties and improve the user experience.

[0050] For example, the voltage conversion circuit 10 is used to be electrically connected to the ground terminal GND.

[0051] In one embodiment, such as Figure 4 As shown, the selection circuit 20 includes a first switch 21 and a second switch 22. The first selection terminal of the first switch 21 is electrically connected to the output terminal of the voltage conversion circuit 10, the second selection terminal of the first switch 21 is electrically connected to the ground terminal GND, and the fixed terminal of the first switch 21 is electrically connected to the first input terminal. The first selection terminal of the second switch 22 is electrically connected to the ground terminal GND, the second selection terminal of the second switch 22 is electrically connected to the output terminal of the voltage conversion circuit 10, and the fixed terminal of the second switch 22 is electrically connected to the second input terminal.

[0052] In this embodiment, due to the simple structure of the first and second switches, the complexity of the selection circuit structure is reduced by using the first and second switches to form the selection circuit. Furthermore, when the first selection terminal of the first switch is connected to its fixed terminal and the first selection terminal of the second switch is connected to its fixed terminal, the selection circuit can drive the electrochromic film with a positive second voltage. When the second selection terminal of the first switch is connected to its fixed terminal and the second selection terminal of the second switch is connected to its fixed terminal, the selection circuit can drive the electrochromic film with a negative second voltage. By switching the conduction modes of the first and second switches, the polarity of the second voltage can be adjusted, thereby reducing the complexity of driving the electrochromic film.

[0053] For example, the first switch 21 and the second switch 22 may be configured in a double single-pole double-throw switch.

[0054] In one embodiment, such as Figure 5As shown, the selection circuit 20 includes a third switch 23 and a fourth switch 24. The fixed terminal of the third switch 23 is electrically connected to the output terminal of the voltage conversion circuit 10. The first selection terminal of the third switch 23 is used to connect to the first input terminal, and the second selection terminal of the third switch 23 is used to connect to the second input terminal. The fixed terminal of the fourth switch 24 is used to connect to the ground terminal GND. The first selection terminal of the fourth switch 24 is used to connect to the first input terminal, and the second selection terminal of the fourth switch 24 is used to connect to the second input terminal.

[0055] In this embodiment, due to the simple structure of the third and fourth switches, the complexity of the selection circuit structure is reduced by using the third and fourth switches to form the selection circuit. When the first selection terminal of the third switch is connected to the fixed terminal of the third switch and the second selection terminal of the fourth switch is connected to the fixed terminal of the fourth switch, the selection circuit can drive the electrochromic film with a positive second voltage. When the second selection terminal of the third switch is connected to the fixed terminal of the third switch and the first selection terminal of the fourth switch is connected to the fixed terminal of the fourth switch, the selection circuit can drive the electrochromic film with a negative second voltage. By switching the conduction mode of the third and fourth switches, the polarity of the second voltage can be adjusted, thereby reducing the complexity of driving the electrochromic film.

[0056] For example, the voltage conversion circuit 10 can be a DC-DC conversion circuit.

[0057] In one embodiment, the voltage conversion circuit 10 includes a buck circuit.

[0058] In this embodiment, when the amplitude of the driving voltage required by the electrochromic film is lower than the amplitude of the first voltage, the step-down circuit can reduce the first voltage to the second voltage, thereby driving the electrochromic film with a suitable driving voltage to improve the reliability of the driving circuit.

[0059] For example, the buck circuit includes a Buck circuit.

[0060] In one embodiment, the voltage conversion circuit 10 includes a boost circuit.

[0061] In this embodiment, when the amplitude of the driving voltage required by the electrochromic film is higher than the amplitude of the first voltage, the boost circuit can increase the first voltage to the second voltage, thereby driving the electrochromic film with a suitable driving voltage to improve the reliability of the driving circuit.

[0062] For example, the boost circuit includes a boost circuit.

[0063] In one embodiment, the voltage conversion circuit 10 includes a buck-boost circuit.

[0064] In this embodiment, when the amplitude of the driving voltage required by the electrochromic film is higher than the amplitude of the first voltage, the buck-boost circuit can increase the first voltage to a second voltage and drive the electrochromic film through the gating circuit. When the amplitude of the driving voltage required by the electrochromic film is lower than the amplitude of the first voltage, the buck-boost circuit can decrease the first voltage to the second voltage and drive the electrochromic film through the gating circuit. Regardless of whether the amplitude of the first voltage is greater than the amplitude of the driving voltage required by the electrochromic film, the buck-boost circuit can convert the first voltage into a suitable second voltage to drive the electrochromic film, thereby improving the reliability of the driving circuit.

[0065] For example, the buck-boost circuit includes a Buck-Boost circuit.

[0066] In one embodiment, the voltage conversion circuit 10 is located in the power management integrated circuit (PMIC) of the electronic device.

[0067] In this embodiment, since the power management circuit in the electronic device has functions such as voltage conversion, current control, and battery management, the voltage conversion function of the power management circuit can be reused when the voltage conversion circuit is located in the power management circuit of the electronic device. Because the drive circuit does not require an additional voltage conversion circuit, the complexity of the drive circuit structure is reduced, thereby reducing the size of the electronic device.

[0068] For example, a low-dropout regulator (LDO) in the power management circuit can be used as the voltage conversion circuit 10. When the LDO is turned on, it can convert the first voltage into a second voltage and output it to the gating circuit 20. When the LDO is turned off, it stops outputting the second voltage to the gating circuit 20.

[0069] In one embodiment, such as Figure 6 As shown, the drive circuit also includes a control circuit 40. The first terminal of the control circuit 40 is electrically connected to the control terminal of the voltage conversion circuit 10, and the control circuit 40 is used to control the operation of the voltage conversion circuit 10.

[0070] In this embodiment, the voltage of the electrochromic film gradually decreases after it is driven. Under the control of the control circuit, the voltage conversion circuit can intermittently output a second voltage to the electrochromic film, thus reducing the power consumption of the driving circuit by eliminating the need for continuous supply of the second voltage. Furthermore, because the control circuit can adjust the amplitude of the second voltage output by the voltage conversion circuit, it allows the voltage conversion circuit to drive the electrochromic film with different second voltages, thereby improving the reliability of the driving circuit.

[0071] For example, the control circuit 40 includes an application processor. The application processor can be a processor in an electronic device or an additional processor.

[0072] For example, the first terminal of the control circuit 40 may include a first signal terminal and a second signal terminal. The control terminal of the voltage conversion circuit 10 may include a first signal terminal and a second signal terminal. The first signal terminal of the control circuit 40 is electrically connected to the first signal terminal of the voltage conversion circuit 10 via a clock signal line, and the second signal terminal of the control circuit 40 is electrically connected to the second signal terminal of the voltage conversion circuit 10 via a data signal line. When the voltage conversion circuit 10 is located in a power management circuit, the control circuit 40 is electrically connected to the first and second signal terminals of the voltage conversion circuit 10 via a two-wire serial interface.

[0073] In one embodiment, the second terminal of the control circuit 40 is electrically connected to the fifth terminal of the gating circuit 20, and the control circuit 40 is also used to control the gating circuit 20 to select the output terminal of the voltage conversion circuit 10 to be connected to the first input terminal or the second input terminal.

[0074] In this embodiment, when the control circuit controls the gating circuit to connect the output terminal of the voltage conversion circuit to the first input terminal, the driving circuit drives the electrochromic film with a positive second voltage. When the control circuit controls the gating circuit to connect the output terminal of the voltage conversion circuit to the second input terminal, the driving circuit drives the electrochromic film with a negative second voltage. Since the control circuit can control the gating circuit to drive the electrochromic film with either a positive or negative second voltage, the complexity of driving circuit control is reduced.

[0075] For example, the control circuit 40 can control the first selection terminal of the first switch 21 to be connected to the fixed terminal of the first switch 21 and the first selection terminal of the second switch 22 to be connected to the fixed terminal of the second switch 22 via the fifth terminal, so that the driving circuit drives the electrochromic film 30 with a positive second voltage. The control circuit 40 can also control the second selection terminal of the first switch 21 to be connected to the fixed terminal of the first switch 21 and the second selection terminal of the second switch 22 to be connected to the fixed terminal of the second switch 22 via the fifth terminal, so that the driving circuit drives the electrochromic film 30 with a negative second voltage.

[0076] For example, the control circuit 40 can control the first selection terminal of the third switch 23 to be connected to the fixed terminal of the third switch 23 and the second selection terminal of the fourth switch 24 to be connected to the fixed terminal of the fourth switch 24 via the fifth terminal, so that the driving circuit drives the electrochromic film 30 with a positive second voltage. The control circuit 40 can also control the second selection terminal of the third switch 23 to be connected to the fixed terminal of the third switch 23 and the first selection terminal of the fourth switch 24 to be connected to the fixed terminal of the fourth switch 24 via the fifth terminal, so that the driving circuit drives the electrochromic film 30 with a negative second voltage.

[0077] In one embodiment, the third terminal of the control circuit 40 is electrically connected to the output terminal of the voltage conversion circuit 10, and the control circuit 40 is also used to detect the voltage of the first input terminal or the second input terminal.

[0078] In this embodiment, the control circuit can detect the voltage of the electrochromic film by detecting the voltage at the first or second input terminal. When the control circuit detects that the voltage of the electrochromic film is insufficient to meet the transparency requirements, it can output a suitable second voltage to the electrochromic film by controlling the voltage conversion circuit and the gating circuit to improve the reliability of the driving circuit. Furthermore, since the control circuit can detect the voltage at either the first or second input terminal, there is no need to include an additional bipolar analog-to-digital converter circuit in the driving circuit, thereby reducing the complexity of the driving circuit structure.

[0079] For example, the control circuit 40 may include a unipolar analog-to-digital converter circuit. Since the control circuit 40 always detects a positive voltage, the state of the gating circuit 20 needs to be recorded after the voltage conversion circuit 10 stops outputting voltage. If the current state of the gating circuit 20 is to provide a positive voltage to the electrochromic film 30, it is recorded as "1". If the current state of the gating circuit 20 is to provide a negative voltage to the electrochromic film 30, it is recorded as "-1". The voltage values ​​of the first and second input terminals can be determined by multiplying the voltage value detected by the control circuit 40 by 1 or -1. When the voltage of the electrochromic film 30 is a positive voltage value, if the detected voltage value is less than the voltage value corresponding to the desired transparency, the voltage conversion circuit 10 is activated to charge the electrochromic film 30. When the voltage of the electrochromic film 30 is a negative voltage value, if the detected voltage value is greater than the voltage value corresponding to the desired transparency, the voltage conversion circuit 10 is activated to charge the electrochromic film 30.

[0080] In one embodiment, such as Figure 7 As shown, the driving circuit also includes an analog-to-digital converter circuit 50. The first input terminal of the analog-to-digital converter circuit 50 is electrically connected to the first input terminal, the second input terminal of the analog-to-digital converter circuit 50 is electrically connected to the second input terminal, and the third terminal of the analog-to-digital converter circuit 50 is electrically connected to the first terminal of the control circuit 40. The analog-to-digital converter circuit 50 is used to convert the voltages of the first and second input terminals from analog signals into digital signals and then transmit them to the control circuit 40.

[0081] In this embodiment, since the analog-to-digital converter (ADC) circuit can determine not only the voltage amplitudes of the first and second input terminals, but also their voltage polarities, the control circuit can determine the voltage of the electrochromic film through the ADC circuit. Therefore, when the control circuit detects that the voltage of the electrochromic film cannot meet the transparency requirements, it can output a suitable second voltage to the electrochromic film by controlling the voltage conversion circuit and the gating circuit to improve the reliability of the driving circuit. Furthermore, since the ADC circuit can detect bipolar voltages, the control circuit does not need to determine the polarity, thus reducing the complexity of the driving circuit control.

[0082] For example, the first signal terminal and the second signal terminal of the control circuit 40 are electrically connected to the first signal terminal and the second signal terminal of the voltage conversion circuit 10 and the first signal terminal and the second signal terminal of the control circuit 40, respectively, via clock signal line and data signal line.

[0083] An exemplary embodiment of this disclosure provides a driving circuit, such as Figure 8 As shown, the driving circuit includes a power management circuit (PMIC), a gating circuit 20, and an application processor (AP). The PMIC contains a low-dropout linear regulator. The gating circuit 20 includes a first switch 21 and a second switch 22. The input terminal of the PMIC is electrically connected to the input power supply Vin. The output terminal of the low-dropout linear regulator is electrically connected to the first terminal of the application processor AP, the first selection terminal of the first switch 21, and the second selection terminal of the second switch 22. The two control terminals of the PMIC are electrically connected to the second and third terminals of the application processor AP via signal lines, respectively. The fixed terminal of the first switch 21 is electrically connected to the first input terminal of the electrochromic film 30. The fixed terminal of the second switch 22 is connected to the second input terminal of the electrochromic film 30. The fourth terminal of the application processor AP is electrically connected to the fifth terminal of the gating circuit 20. The PMIC, the application processor AP, the second selection terminal of the first switch 21, and the first selection terminal of the second switch 22 are all electrically connected to the ground terminal GND.

[0084] For example, if the electrochromic film 30 needs to exhibit a first transparency (the voltage corresponding to the first transparency is U1, U1 > 0V), the application processor AP controls the first selection terminal of the first switch 21 to be connected to the fixed terminal of the first switch 21, and the first selection terminal of the second switch 22 to be connected to the fixed terminal of the second switch 22. Simultaneously, the application processor AP controls the low-dropout linear regulator to output a second voltage, driving the electrochromic film 30 with a positive second voltage. When the voltage at the output terminal of the low-dropout linear regulator is detected to be the second voltage U2 (U2 > U1), the application processor AP controls the low-dropout linear regulator to stop operating (or stops operating after maintaining this voltage for a period of time), and records the state of the gating circuit 20 as "1". When the voltage at the output terminal of the low-dropout linear regulator is lower than U1 (1*detection value) and the electrochromic film 30 still needs to exhibit the first transparency, the application processor AP controls the low-dropout linear regulator to operate, and controls the first switch 21 and the second switch 22 to continue driving the electrochromic film 30 with the positive second voltage until the voltage at the output terminal of the low-dropout linear regulator is detected to be the second voltage U2.

[0085] For example, if the electrochromic film 30 needs to exhibit a second transparency (the voltage corresponding to the second transparency is U3, U3 < 0V), the application processor AP controls the second selection terminal of the first switch 21 to be electrically connected to the fixed terminal of the first switch 21, and the second selection terminal of the second switch 22 to be electrically connected to the fixed terminal of the second switch 22. Simultaneously, the application processor AP controls the low-dropout linear regulator to output a second voltage, driving the electrochromic film 30 with a negative second voltage. When the voltage at the output terminal of the low-dropout linear regulator is detected to be the second voltage U4 (U4 < U3), the application processor AP controls the low-dropout linear regulator to stop operating (or stops operating after maintaining this voltage for a period of time), and records the state of the gating circuit 20 as "-1".

[0086] When the voltage at the output of the low-dropout linear regulator is higher than U3 (-1 * detection value) and the electrochromic film 30 still needs to exhibit the second transparency, the application processor AP controls the low-dropout linear regulator to operate, and controls the first switch 21 and the second switch 22 to continue driving the electrochromic film 30 with the negative second voltage until the voltage at the output of the low-dropout linear regulator is detected to be the second voltage U4.

[0087] An exemplary embodiment of this disclosure provides a driving circuit, such as Figure 9As shown, the driving circuit includes a voltage conversion circuit 10, a gating circuit 20, and an application processor (AP). The gating circuit 20 includes a first switch 21 and a second switch 22. The input terminal of the voltage conversion circuit 10 is electrically connected to the input power supply Vin. The output terminal of the voltage conversion circuit 10 is electrically connected to the first terminal of the application processor AP, the first selection terminal of the first switch 21, and the second selection terminal of the second switch 22. The two control terminals of the voltage conversion circuit 10 are electrically connected to the second and third terminals of the application processor AP via signal lines, respectively. The fixed terminal of the first switch 21 is electrically connected to the first input terminal of the electrochromic film 30. The fixed terminal of the second switch 22 is electrically connected to the second input terminal of the electrochromic film 30. The fourth terminal of the application processor AP is electrically connected to the fifth terminal of the gating circuit 20. The voltage conversion circuit 10, the application processor AP, the second selection terminal of the first switch 21, and the first selection terminal of the second switch 22 are all electrically connected to the ground terminal GND.

[0088] The working principle of this embodiment is the same as that of the above embodiments, and will not be repeated here.

[0089] An exemplary embodiment of this disclosure provides a driving circuit, such as Figure 10 As shown, the driving circuit includes a voltage conversion circuit 10, a gating circuit 20, an application processor (AP), and an analog-to-digital converter (ADC) 50. The gating circuit 20 includes a first switch 21 and a second switch 22. The input terminal of the voltage conversion circuit 10 is electrically connected to the input power supply Vin. The output terminal of the voltage conversion circuit 10 is electrically connected to the first selection terminal of the first switch 21 and the second selection terminal of the second switch 22. The two control terminals of the voltage conversion circuit 10 are electrically connected to the second and third terminals of the application processor (AP) and the two third terminals of the ADC 50, respectively, via signal lines. The fixed terminal of the first switch 21 is electrically connected to the first input terminal of the ADC 50 and the first input terminal of the electrochromic film 30. The fixed terminal of the second switch 22 is electrically connected to the second input terminal of the ADC 50 and the second input terminal of the electrochromic film 30. The fourth terminal of the application processor (AP) is electrically connected to the fifth terminal of the gating circuit 20. The voltage conversion circuit 10, the application processor (AP), the second selection terminal of the first switch 21, and the first selection terminal of the second switch 22 are all electrically connected to the ground terminal GND.

[0090] The working principle of this embodiment is basically the same as that of the above embodiments. The only difference is that the voltage of the first input terminal and the second input terminal can be obtained directly without recording the state of the gating circuit 20. This will not be elaborated here.

[0091] An exemplary embodiment of this disclosure provides an electronic device including the driving circuit described above.

[0092] In one embodiment, the electronic device further includes an electrochromic film 30 and a flash lamp. A driving circuit is electrically connected to the electrochromic film 30, which forms the lampshade of the flash lamp.

[0093] In this embodiment, by using the electrochromic film as the lampshade of the flash, the transparency of the electrochromic film is adjusted to the same color as the back cover of the electronic device when the flash is not in use, which improves the aesthetics of the electronic device. When the flash is needed, the transparency of the electrochromic film is adjusted to near transparency, which improves the reliability of the flash.

[0094] For example, electronic devices include mobile phones, laptops, tablets, and wearable devices.

[0095] For example, if the back cover of the electronic device is black, the transparency of the electrochromic film 30 can be adjusted to greater than 75% when using a flash. When not using a flash, the transparency of the electrochromic film 30 can be adjusted to less than 10%.

[0096] In one embodiment, the electronic device further includes an electrochromic film 30 and a lens. A driving circuit is electrically connected to the electrochromic film 30, which covers the lens.

[0097] In this embodiment, by adjusting the output voltage of the driving circuit, the color of the lens can be changed, thereby improving the user experience.

[0098] For example, electronic devices may be smart glasses, etc.

[0099] refer to Figure 11 As shown, the electronic device 400 may include one or more of the following components: a processing component 402, a memory 404, a power supply component 406, a multimedia component 408, an audio component 410, an input / output (I / O) interface 412, a sensor component 414, and a communication component 416.

[0100] Processing component 402 typically controls the overall operation of electronic device 400, such as operations associated with display, telephone calls, data communication, camera operation, and recording. Processing component 402 may include one or more processors 420 to execute instructions to perform all or part of the steps of the methods described above. Furthermore, processing component 402 may include one or more modules to facilitate interaction between processing component 402 and other components. For example, processing component 402 may include a multimedia module to facilitate interaction between multimedia component 408 and processing component 402.

[0101] Memory 404 is configured to store various types of data to support the operation of electronic device 400. Examples of this data include instructions for any application or method operating on electronic device 400, contact data, phonebook data, messages, pictures, videos, etc. Memory 404 can be implemented by any type of volatile or non-volatile storage terminal or a combination thereof, such as static random access memory (SRAM), electrically erasable programmable read-only memory (EEPROM), erasable programmable read-only memory (EPROM), programmable read-only memory (PROM), read-only memory (ROM), magnetic storage, flash memory, magnetic disk, or optical disk.

[0102] Power supply component 406 provides power to various components of electronic device 400. Power supply component 406 may include a power management system, one or more power supplies, and other components associated with generating, managing, and distributing power to electronic device 400.

[0103] Multimedia component 408 includes a screen that provides an output interface between electronic device 400 and user. In some embodiments, the screen may include a liquid crystal display (LCD) and a touch panel (TP). If the screen includes a touch panel, the screen may be implemented as a touchscreen to receive input signals from the user. The touch panel includes one or more touch sensors to sense touches, swipes, and gestures on the touch panel. The touch sensors may sense not only the boundaries of touch or swipe actions but also the duration and pressure associated with the touch or swipe operation. In some embodiments, multimedia component 408 includes a front-facing camera module and / or a rear-facing camera module. When electronic device 400 is in an operating mode, such as shooting mode or video mode, the front-facing camera module and / or rear-facing camera module may receive external multimedia data. Each front-facing camera module and rear-facing camera module may be a fixed optical lens system or have focal length and optical zoom capabilities.

[0104] Audio component 410 is configured to output and / or input audio signals. For example, audio component 410 includes a microphone (MIC) configured to receive external audio signals when electronic device 400 is in an operating mode, such as call mode, recording mode, and voice recognition mode. The received audio signals may be further stored in memory 404 or transmitted via communication component 416. In some embodiments, audio component 410 also includes a speaker for outputting audio signals.

[0105] I / O interface 412 provides an interface between processing component 402 and peripheral interface modules, such as keyboards, click wheels, buttons, etc. These buttons may include, but are not limited to, home buttons, volume buttons, power buttons, and lock buttons.

[0106] Sensor assembly 414 includes one or more sensors for providing state assessments of various aspects of electronic device 400. For example, sensor assembly 414 may detect the on / off state of electronic device 400, the relative positioning of components such as the display and keypad of electronic device 400, changes in position of electronic device 400 or a component of electronic device 400, the presence or absence of user contact with electronic device 400, orientation or acceleration / deceleration of electronic device 400, and temperature changes of electronic device 400. Sensor assembly 414 may include a proximity sensor configured to detect the presence of nearby objects without any physical contact. Sensor assembly 414 may also include a light sensor, such as a CMOS or CCD image sensor, for use in imaging applications. In some embodiments, sensor assembly 414 may also include an accelerometer, gyroscope, magnetometer, pressure sensor, or temperature sensor.

[0107] Communication component 416 is configured to facilitate wired or wireless communication between electronic device 400 and other terminals. Electronic device 400 can access wireless networks based on communication standards, such as WiFi, 2G, 3G, 4G, 5G, or combinations thereof. In one exemplary embodiment, communication component 416 receives broadcast signals or broadcast-related information from an external broadcast management system via a broadcast channel. In one exemplary embodiment, communication component 416 also includes a near-field communication (NFC) module to facilitate short-range communication. For example, the NFC module may be implemented based on radio frequency identification (RFID) technology, Infrared Data Association (IrDA) technology, ultra-wideband (UWB) technology, Bluetooth (BT) technology, and other technologies.

[0108] In an exemplary embodiment, the electronic device 400 may be implemented by one or more application-specific integrated circuits (ASICs), digital signal processors (DSPs), digital signal processing terminals (DSPDs), programmable logic devices (PLDs), field-programmable gate arrays (FPGAs), controllers, microcontrollers, microprocessors, or other electronic components.

[0109] In the description of this specification, the references to terms such as "one embodiment," "some embodiments," "example," "specific example," or "some examples," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of this disclosure. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples. Moreover, without contradiction, those skilled in the art can combine and integrate the different embodiments or examples described in this specification, as well as the features of different embodiments or examples.

[0110] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this disclosure, "a plurality of" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0111] Other embodiments of this disclosure will readily occur to those skilled in the art upon consideration of the specification and practice of the utility models disclosed herein. This disclosure is intended to cover any variations, uses, or adaptations of this disclosure that follow the general principles of this disclosure and include common knowledge or customary techniques in the art not disclosed herein. The specification and examples are to be considered exemplary only, and the true scope and spirit of this disclosure are indicated by the following claims.

[0112] It should be understood that this disclosure is not limited to the precise structures described above and shown in the accompanying drawings, and various modifications and changes can be made without departing from its scope. The scope of this disclosure is limited only by the appended claims.

Claims

1. A drive circuit characterized by comprising: The driving circuit includes: A voltage conversion circuit, wherein the input terminal of the voltage conversion circuit is used to be electrically connected to an input power supply, and the voltage conversion circuit is used to convert a first voltage of the input power supply into a second voltage; A gating circuit is provided, wherein a first terminal of the gating circuit is electrically connected to the output terminal of the voltage conversion circuit, a second terminal of the gating circuit is electrically connected to the first input terminal of the electrochromic film, and a third terminal of the gating circuit is electrically connected to the second input terminal of the electrochromic film. The gating circuit is used to select whether the output terminal of the voltage conversion circuit is connected to the first input terminal or the second input terminal, so as to drive the electrochromic film with a positive or negative second voltage. A control circuit, wherein the first terminal of the control circuit is electrically connected to the control terminal of the voltage conversion circuit, and the control circuit is used to control the operation of the voltage conversion circuit; The control circuit includes a unipolar analog-to-digital converter circuit. The voltage of the electrochromic film is determined by combining the state of the unipolar analog-to-digital converter circuit with the state of the gating circuit. The state of the gating circuit indicates the voltage polarity of the first input terminal and the second input terminal. The voltage conversion circuit is electrically connected between the input power supply and the gating circuit, and the gating circuit is electrically connected between the voltage conversion circuit and the electrochromic film.

2. The drive circuit according to claim 1, characterized in that, The fourth terminal of the gating circuit is used to be electrically connected to the ground terminal, and the gating circuit is also used to select whether the ground terminal is connected to the second input terminal or the first input terminal.

3. The drive circuit according to claim 2, characterized in that, The gating circuit includes: A first switch, wherein a first selection terminal of the first switch is electrically connected to the output terminal of the voltage conversion circuit, a second selection terminal of the first switch is electrically connected to the ground terminal, and a fixed terminal of the first switch is electrically connected to the first input terminal; A second switch, wherein a first selection terminal of the second switch is electrically connected to the ground terminal, a second selection terminal of the second switch is electrically connected to the output terminal of the voltage conversion circuit, and a fixed terminal of the second switch is electrically connected to the second input terminal; or, The third switch has a fixed terminal that is electrically connected to the output terminal of the voltage conversion circuit, a first selection terminal that is electrically connected to the first input terminal, and a second selection terminal that is electrically connected to the second input terminal. The fourth switch has a fixed terminal for electrical connection to the ground terminal, a first selection terminal for electrical connection to the first input terminal, and a second selection terminal for electrical connection to the second input terminal.

4. The drive circuit of claim 1, wherein The voltage conversion circuit includes a buck circuit, a boost circuit, or a buck-boost circuit.

5. The drive circuit according to claim 1, characterized by The voltage conversion circuit is located in the power management circuit of the electronic device.

6. The drive circuit of claim 1, wherein The second terminal of the control circuit is electrically connected to the fifth terminal of the gating circuit. The control circuit is also used to control the gating circuit to select whether the output terminal of the voltage conversion circuit is connected to the first input terminal or the second input terminal.

7. The drive circuit according to claim 1, characterized by The third terminal of the control circuit is electrically connected to the output terminal of the voltage conversion circuit, and the control circuit is also used to detect the voltage of the first input terminal or the second input terminal.

8. The drive circuit of claim 1, wherein, The driving circuit also includes: An analog-to-digital converter (ADC) circuit is provided, wherein a first input terminal of the ADC circuit is electrically connected to the first input terminal, a second input terminal of the ADC circuit is electrically connected to the second input terminal, and a third terminal of the ADC circuit is electrically connected to the first terminal of the control circuit. The ADC circuit is used to convert the voltages of the first input terminal and the second input terminal from analog signals to digital signals and then transmit them to the control circuit.

9. An electronic device, comprising: The electronic device includes the driving circuit as described in any one of claims 1 to 8.

10. The electronic device according to claim 9, characterized in that, The electronic device also includes the electrochromic film and a flash lamp, the driving circuit is electrically connected to the electrochromic film, and the electrochromic film forms the lampshade of the flash lamp.

11. The electronic device according to claim 9, characterized in that, The electronic device further includes the electrochromic film and a lens, the driving circuit is electrically connected to the electrochromic film, and the electrochromic film covers the lens.

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