CN113763879A - Power supply circuit, display screen, electronic equipment and power supply control method - Google Patents

Power supply circuit, display screen, electronic equipment and power supply control method Download PDF

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Publication number
CN113763879A
CN113763879A CN202111079994.7A CN202111079994A CN113763879A CN 113763879 A CN113763879 A CN 113763879A CN 202111079994 A CN202111079994 A CN 202111079994A CN 113763879 A CN113763879 A CN 113763879A
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China
Prior art keywords
voltage
power supply
module
mode switching
output
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Granted
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CN202111079994.7A
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Chinese (zh)
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CN113763879B (en
Inventor
王勇
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Vivo Mobile Communication Co Ltd
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Vivo Mobile Communication Co Ltd
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    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G3/00—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes
    • G09G3/20—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters
    • G09G3/22—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources
    • G09G3/30—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources using electroluminescent panels
    • G09G3/32—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources using electroluminescent panels semiconductive, e.g. using light-emitting diodes [LED]
    • G09G3/3208—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources using electroluminescent panels semiconductive, e.g. using light-emitting diodes [LED] organic, e.g. using organic light-emitting diodes [OLED]
    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G3/00—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes
    • G09G3/20—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters
    • G09G3/34—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters by control of light from an independent source
    • G09G3/36—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters by control of light from an independent source using liquid crystals
    • G09G3/3611—Control of matrices with row and column drivers
    • G09G3/3696—Generation of voltages supplied to electrode drivers
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
    • H02M3/00—Conversion of dc power input into dc power output
    • H02M3/02—Conversion of dc power input into dc power output without intermediate conversion into ac
    • H02M3/04—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters
    • H02M3/10—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode
    • H02M3/145—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal
    • H02M3/155—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only
    • H02M3/156—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only with automatic control of output voltage or current, e.g. switching regulators
    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G2330/00—Aspects of power supply; Aspects of display protection and defect management
    • G09G2330/02—Details of power systems and of start or stop of display operation

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  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Computer Hardware Design (AREA)
  • General Physics & Mathematics (AREA)
  • Theoretical Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Crystallography & Structural Chemistry (AREA)
  • Power Engineering (AREA)
  • Dc-Dc Converters (AREA)
  • Control Of Indicators Other Than Cathode Ray Tubes (AREA)

Abstract

The application discloses a power supply circuit, a display screen, electronic equipment and a power supply control method, and belongs to the technical field of electricity. The power supply circuit includes: the device comprises a voltage conversion module, a mode switching module and a voltage detection module; the first power supply, the voltage conversion module, the mode switching module and the pixel circuit are connected in sequence; the voltage detection module is respectively connected with the voltage conversion module and the mode switching module and is used for detecting a first voltage at the input end of the voltage conversion module and a second voltage at the output end of the mode switching module. When the difference value of the first voltage and the second voltage is larger than a preset threshold value, the voltage conversion module outputs a target voltage, and the mode switching module outputs the target voltage in a direct-through mode; when the difference value of the first voltage and the second voltage is smaller than or equal to a preset threshold value, the voltage conversion module outputs a third voltage, and the mode switching module is in a voltage stabilization mode and outputs a target voltage; the third voltage is greater than the target voltage.

Description

Power supply circuit, display screen, electronic equipment and power supply control method
Technical Field
The application belongs to the technical field of electricity, and particularly relates to a power supply circuit, a display screen, electronic equipment and a power supply control method.
Background
The pixel circuit has a positive power supply terminal (ELVDD) and a negative power supply terminal (ELVSS), and the pixel circuit may be powered by a power supply circuit connecting the ELVDD and the ELVSS. For example: the power supply circuit for supplying power to the ELVDD can obtain electric energy when the electronic equipment is charged through the charging equipment, when the charging electric quantity is high, the voltage of the input end and the voltage of the output end of the power supply circuit are relatively close, and the voltage of the output end of the power supply circuit rises along with the voltage of the input end; when the voltage at the output of the power supply circuit reaches a threshold value, the voltage at the output of the ELVDD power supply circuit may drop, the voltage (Vgs) between the source and gate of the transistor in the pixel circuit may fluctuate, and the voltage fluctuation of the Vgs affects the current (Iled) of the light emitting diode, which may cause a problem of flicker.
Disclosure of Invention
An object of the embodiments of the present application is to provide a power supply circuit, a display screen, an electronic device, and a power supply control method, which can solve a problem that a current power supply circuit that supplies power to a pixel circuit may cause screen flicker when obtaining electric energy through a charging device.
In order to solve the technical problem, the present application is implemented as follows:
in a first aspect, an embodiment of the present application provides a power supply circuit, including:
the input end of the voltage conversion module is connected with a first power supply;
the input end of the mode switching module is connected with the output end of the voltage conversion module, and the output end of the mode switching module is connected with the positive power supply end of the pixel circuit;
the voltage detection module is respectively connected with the input end of the voltage conversion module and the output end of the mode switching module; the voltage detection module is used for detecting a first voltage input by the input end of the voltage conversion module and a second voltage output by the output end of the mode switching module;
when the difference value between the first voltage and the second voltage is greater than a preset threshold value, the voltage conversion module is used for outputting a target voltage to the mode switching module, and the mode switching module is in a through mode and outputs the target voltage; under the condition that the difference value between the first voltage and the second voltage is smaller than or equal to the preset threshold value, the voltage conversion module is used for outputting a third voltage to the mode switching module, and the mode switching module is in a voltage stabilization mode and outputs the target voltage; wherein the third voltage is greater than the target voltage.
In a second aspect, an embodiment of the present application provides a display screen, including the power supply circuit as described in the first aspect.
In a third aspect, an embodiment of the present application provides an electronic device, which includes the display screen as described above.
In a fourth aspect, an embodiment of the present application provides a power supply control method, which is applied to the electronic device according to the third aspect, where the method includes:
acquiring a first voltage input by an input end of the voltage conversion module and a second voltage output by an output end of the mode switching module;
under the condition that the difference value of the first voltage and the second voltage is larger than a preset threshold value, controlling the voltage conversion module to output a target voltage to the mode switching module, and controlling the mode switching module to be in a through mode so as to output the target voltage;
under the condition that the difference value of the first voltage and the second voltage is smaller than or equal to the preset threshold value, controlling the voltage conversion module to output a third voltage to the mode switching module, and controlling the mode switching module to be in a voltage stabilization mode so as to output the target voltage; wherein the third voltage is greater than the target voltage.
In a fifth aspect, an embodiment of the present application provides a power supply control apparatus, which is applied to the electronic device according to the third aspect, and the apparatus includes:
the acquisition module is used for acquiring a first voltage input by the input end of the voltage conversion module and a second voltage output by the output end of the mode switching module;
the first control module is used for controlling the voltage conversion module to output a target voltage to the mode switching module and controlling the mode switching module to be in a through mode to output the target voltage under the condition that the difference value between the first voltage and the second voltage is larger than a preset threshold value;
the second control module is used for controlling the voltage conversion module to output a third voltage to the mode switching module and controlling the mode switching module to be in a voltage stabilization mode to output the target voltage under the condition that the difference value between the first voltage and the second voltage is smaller than or equal to the preset threshold value; wherein the third voltage is greater than the target voltage.
In a sixth aspect, the present application provides an electronic device, which includes a processor, a memory, and a program or an instruction stored on the memory and executable on the processor, and when the program or the instruction is executed by the processor, the method of controlling power supply according to the fourth aspect is implemented.
In a seventh aspect, the present application provides a readable storage medium, on which a program or an instruction is stored, and when executed by a processor, the program or the instruction implements the steps of the power supply control method according to the fourth aspect.
In an eighth aspect, an embodiment of the present application provides a chip, where the chip includes a processor and a communication interface, where the communication interface is coupled to the processor, and the processor is configured to execute a program or instructions to implement the steps of the power supply control method according to the first aspect.
In this embodiment, when a difference between the first voltage and the second voltage is greater than a predetermined threshold, if the first voltage input by the input terminal of the voltage conversion module is low, the voltage conversion module may output a target voltage, and the mode switching module may output the target voltage to the pixel circuit in the pass-through mode; when the difference value between the first voltage and the second voltage is smaller than or equal to a preset threshold value, namely the voltage of the input end of the voltage conversion module is close to the voltage of the output end of the mode switching module, the voltage conversion module adjusts the input voltage to obtain a third voltage higher than the target voltage, and the mode switching module adjusts the input third voltage in a voltage stabilization mode and outputs the voltage to the pixel circuit to be maintained at the target voltage, so that the output voltage is maintained at a stable state, and the problem that the voltage between a source electrode and a grid electrode of a transistor in the pixel circuit possibly shakes due to unstable voltage input by the voltage conversion module at present, and therefore the screen flicker occurs is solved.
Drawings
FIG. 1 is one of the block diagrams of a power supply circuit of an embodiment of the present application;
FIG. 2 is a second block diagram of a power supply circuit according to an embodiment of the present application;
FIG. 3 is a circuit diagram of a voltage converting unit according to an embodiment of the present application;
FIG. 4 is one of the schematic diagrams of a power supply circuit of an embodiment of the present application;
FIG. 5 is a third block diagram of a power supply circuit according to an embodiment of the present application;
FIG. 6 is a second schematic diagram of a power supply circuit according to an embodiment of the present application;
FIG. 7 is a flow chart of a power supply control method according to an embodiment of the present application;
fig. 8 is a second flowchart of a power supply control method according to an embodiment of the present application;
fig. 9 is a third flowchart of a power supply control method according to an embodiment of the present application;
fig. 10 is a block diagram of a power supply control apparatus of an embodiment of the present application;
FIG. 11 is a block diagram of an electronic device of an embodiment of the application;
fig. 12 is a hardware configuration diagram of an electronic device according to an embodiment of the present application.
Detailed Description
The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application, and it is obvious that the described embodiments are some, but not all, embodiments of the present application. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present application.
The terms first, second and the like in the description and in the claims of the present application are used for distinguishing between similar elements and not necessarily for describing a particular sequential or chronological order. It will be appreciated that the data so used may be interchanged under appropriate circumstances such that embodiments of the application may be practiced in sequences other than those illustrated or described herein, and that the terms "first," "second," and the like are generally used herein in a generic sense and do not limit the number of terms, e.g., the first term can be one or more than one. In addition, "and/or" in the specification and claims means at least one of connected objects, a character "/" generally means that a preceding and succeeding related objects are in an "or" relationship.
As shown in fig. 1, an embodiment of the present application provides a power supply circuit, including: a voltage conversion module 11, a mode switching module 12 and a voltage detection module 13.
The input end of the voltage conversion module 11 is connected with a first power supply 14; the input end of the mode switching module 12 is connected with the output end of the voltage conversion module 11, and the output end of the mode switching module 12 is connected with the positive power supply end of the pixel circuit 15; the voltage detection module 13 is respectively connected with the input end of the voltage conversion module 11 and the output end of the mode switching module 12; the voltage detection module 13 is configured to detect a first voltage input by the input terminal of the voltage conversion module 11 and a second voltage output by the output terminal of the mode switching module 12.
When the difference between the first voltage and the second voltage is greater than a preset threshold, the voltage conversion module 11 is configured to output a target voltage to the mode switching module 12, and the mode switching module 12 is in a pass-through mode and outputs the target voltage; when the difference between the first voltage and the second voltage is less than or equal to the preset threshold, the voltage conversion module 11 is configured to output a third voltage to the mode switching module 12, and the mode switching module 12 is in a voltage stabilization mode and outputs the target voltage; wherein the third voltage is greater than the target voltage.
Optionally, the power supply circuit is applied to an electronic device, and the first power supply 14 may be a system power supply of the electronic device, that is, the first power supply 14 may be a power supply module in the electronic device for supplying power to the power supply circuit. For example: the power supply circuit can be connected with a power supply module in the electronic device, and the power supply module can obtain electric energy through a charger or can obtain electric energy through a storage battery in the electronic device.
Alternatively, the pixel circuit 15 may be an Active-matrix organic light-emitting diode (AMOLED) pixel circuit; of course, the embodiments of the present application are not limited thereto.
Optionally, the through mode refers to a mode in which the voltage input by the mode switching module 12 is the same as the voltage output by the mode switching module 12, that is, when the voltage conversion module 11 outputs the target voltage to the mode switching module 12, the mode switching module 12 may output the target voltage; the voltage stabilizing mode is a mode in which the mode switching module 12 regulates the input voltage and maintains the output voltage as the target voltage, for example, when the voltage converting module 11 outputs the third voltage to the mode switching module 12, the mode switching module 12 may perform voltage reduction regulation to maintain the output voltage as the target voltage; the output voltage is maintained at the target voltage, which can be understood as the output voltage is maintained within a preset range of fluctuation of the target voltage.
Optionally, the target voltage is a voltage required for a positive power supply terminal of the pixel circuit, for example: the required voltage of the positive power supply terminal of the AMOLED pixel circuit is 4.6V.
Optionally, the mode switching module 12 includes: the low-dropout linear voltage stabilizing unit and the straight-through unit;
the input end of the low dropout linear regulator unit is connected with the output end of the voltage conversion module 11, and the output end of the low dropout linear regulator unit is connected with the positive power supply end of the pixel circuit 15; the input end of the through unit is connected with the output end of the voltage conversion module 11, and the output end of the through unit is connected with the positive power supply end of the pixel circuit 15.
In the direct connection mode, the low-dropout linear voltage stabilizing unit is in a non-working state, and the direct connection unit is in a working state; in the voltage stabilization mode, the straight-through unit is in a non-working state, and the low-dropout linear voltage stabilization unit is in a working state.
Alternatively, the low dropout linear regulator unit being in a non-operating state may refer to a power-down state of the low dropout linear regulator unit, or a line of the low dropout linear regulator unit connected between the voltage conversion module 11 and the pixel circuit 15 being an open circuit (e.g., a switching element in the line is in an open state, so that the line is an open circuit), and the like; correspondingly, the operating state of the low dropout linear regulator unit may refer to a power-on state of the low dropout linear regulator unit, or a line of the low dropout linear regulator unit connected between the voltage conversion module 11 and the pixel circuit 15 is a path (for example, a switching element in the line is in a conducting state, so that the line is a path), and the like, and the embodiment of the present application is not limited thereto.
Alternatively, the non-operating state of the through unit may refer to that a line of the through unit connected between the voltage conversion module 11 and the pixel circuit 15 is an open circuit (for example, a switch element in the line is in an open state, so that the line is an open circuit), and the like; correspondingly, the fact that the through cell is in the working state may mean that a line of the through cell connected between the voltage conversion module 11 and the pixel circuit 15 is a via (for example, a switching element in the line is in a conducting state, so that the line is a via), and the like, which is not limited in this application.
For example: the low dropout linear regulator unit may include a low dropout linear regulator (LDO), and the voltage conversion module 11 is connected to the pixel circuit 15 through the LDO; when the LDO is in a power-on state (namely enabling the LDO), the low-dropout linear voltage regulation unit is in a working state, and when the LDO is in a power-off state (namely not enabling the LDO), the low-dropout linear voltage regulation unit is in a non-working state; or, a switching element is connected in series to a line between the LDO and the pixel circuit 15, and the on/off state of the switching element is controlled, so that the line between the LDO and the pixel circuit 15 is an open/close circuit, and the like, which is not limited in this embodiment of the application.
The pass-through unit may include a switching element, for example, the switching element is connected in parallel with the low dropout linear regulator unit, i.e., the voltage conversion module 11 may be connected to the pixel circuit 15 through the switching element; when the switch element is in an on state, the pass-through unit is in an operating state, and when the switch element is in an off state, the pass-through unit is in a non-operating state, and the like.
In the above solution, when the difference between the first voltage and the second voltage is greater than the preset threshold, for example, when the first voltage input by the input terminal of the voltage conversion module 11 is lower, the voltage conversion module 11 may output the target voltage, and the mode switching module 12 may output the target voltage to the pixel circuit 15 in the through mode; when the difference between the first voltage and the second voltage is less than or equal to a preset threshold, that is, the voltage of the input end of the voltage conversion module 11 is close to the voltage of the output end of the mode switching module 12, the voltage conversion module 11 adjusts the input voltage to obtain a third voltage higher than the target voltage, and the mode switching module 12 adjusts the input third voltage in a voltage stabilization mode and outputs the voltage to the pixel circuit 15 to maintain the target voltage, so that the output voltage is maintained in a stable state.
Optionally, in the case that the low dropout linear regulator unit adopts an LDO, the difference V between the third voltage output by the voltage conversion module 11 and the target voltage output by the mode switching module 12dropIt may be the difference between the input and output voltages of the LDO.
Alternatively, the voltage conversion module 11, the mode switching module 12 and the voltage detection module 13 may be connected to a processor in the electronic device, and the processor may output control signals to the voltage conversion module 11 and the mode switching module 12 according to the voltage detected by the voltage detection module 13 to control the output voltage of the voltage conversion module 11 and the mode switching module 12 to switch between the direct mode and the voltage stabilization mode.
Optionally, as shown in fig. 2 and 5, the power supply circuit further includes: a control module 16; the control module 16 is respectively connected with the voltage conversion module 11 and the mode switching module 12; the control module 16 is configured to control the output voltage of the voltage conversion module 11 and control the mode switching module 12 to switch between the pass-through mode and the voltage stabilization mode.
For example: in the case that the difference between the first voltage and the second voltage is greater than a preset threshold, the control module 16 may control the voltage conversion module 11 to output a target voltage to the mode switching module 12, and control the mode switching module 12 to be in a through mode; in a case that a difference between the first voltage and the second voltage is less than or equal to the preset threshold, the control module 12 may control the voltage conversion module 11 to output a third voltage to the mode switching module 12, and control the mode switching module 12 to be in a voltage stabilization mode.
Optionally, the voltage detection module 13 may be further connected to the output end of the voltage conversion module 11, and configured to detect a fourth voltage at the output end of the voltage conversion module 11; therefore, according to the first voltage input by the input end of the voltage conversion module 11 and the fourth voltage output by the output end of the voltage conversion module 11, the control module 16 can control the voltage conversion module 11 to output the target voltage or the third voltage, so as to ensure the accuracy of the output result of the voltage conversion module 11.
As shown in fig. 2, as one implementation: the voltage conversion module 11 includes: a voltage conversion unit 111; the input end of the voltage conversion unit 111 is connected to the first power supply 14, and the output end of the voltage conversion unit 111 is connected to the input end of the mode switching module 12.
When the difference between the first voltage and the second voltage is greater than a preset threshold, the voltage conversion unit 111 is configured to convert the input first voltage into the target voltage and output the target voltage to the mode switching module 12; when the difference between the first voltage and the second voltage is smaller than or equal to the preset threshold, the voltage conversion unit 111 is configured to convert the input first voltage into the third voltage and output the third voltage to the mode switching module 12.
Optionally, the voltage conversion unit 111 may include a Boost voltage Boost circuit, or the voltage conversion unit 111 may also adopt a voltage reduction circuit, which may be specifically selected according to an input voltage and a voltage required to be output in an actual application scenario of the power supply circuit.
As shown in fig. 3, a circuit schematic diagram of the voltage converting unit 111 is shown, wherein VPH _ PWR is an input terminal of the voltage converting unit 111 and can be connected to the first power supply 14; ELVDD _ MID is an output terminal of the voltage conversion unit 111, i.e., an input terminal of the mode switching module 12; ELVDD is an output terminal of the mode switching module 12 and may be connected to a positive power supply terminal of the pixel circuit 15.
Alternatively, the voltage converting unit 111 may include: the inductor L, the first capacitor C1, the second capacitor C2, the first switch tube Q1 and the second switch tube Q2. The inductor L and the first switching tube Q1 are sequentially connected in series between VPH _ PWR and ELVDD _ MID; a first terminal of the first capacitor C1 is connected to VPH _ PWR, and a second terminal of the first capacitor C1 is connected to a first voltage terminal (e.g., the first voltage terminal may be a ground terminal, or a stable voltage terminal with a non-zero voltage value, etc.); a first end of the second switch Q2 is connected to the connection end between the inductor L and the first switch Q1, and a second end of the second switch Q2 is connected to a second voltage end (for example, the second voltage end may be a ground end, or a stable voltage end with a non-zero voltage value, etc.); the first terminal of the second capacitor C2 is connected to VPH _ PWR, and the second terminal of the second capacitor C2 is connected to a third voltage terminal (e.g., the third voltage terminal may be a ground terminal, or a stable voltage terminal with a non-zero voltage value, etc.).
The control end of the first switch tube Q1 and the control end of the second switch tube Q2 may be connected to a processor in an electronic device, or connected to the control module 16, and by controlling the first switch tube Q1 and the second switch tube Q2 to be alternately turned on or off, the voltage conversion unit 111 may convert the input first voltage into the target voltage and output the target voltage to the mode switching module 12, or convert the input first voltage into the third voltage and output the third voltage to the mode switching module 12.
In at least one embodiment of the present application, the first switch Q1 and the second switch Q2 may be, but are not limited to, thin film transistors or metal-oxide-semiconductor field effect transistors. At this time, the control end of each switching tube may be a gate, the first end of each switching tube may be a source, and the second end of each switching tube may be a drain; alternatively, the control end of each switching tube may be a gate, the first end of each switching tube may be a drain, and the second end of each switching tube may be a source.
Alternatively, the first switch Q1 and the second switch Q2 may be triodes. At this time, the control end of each switching tube may be a base electrode, the first end of each switching tube may be a collector electrode, and the second end of each switching tube may be an emitter electrode; or, the control end of each switching tube may be a base, the first end of each switching tube may be an emitter, and the second end of each switching tube may be a collector.
It should be noted that the circuit structure of the voltage converting unit 111 in the above embodiments of the present application is merely an exemplary illustration, and the voltage converting unit 111 may further include other devices or adopt other circuit structures, and the like, and the embodiments of the present application are not limited thereto.
Optionally, the power supply circuit may further include a third capacitor C3, a first terminal of the third capacitor C3 is connected to ELVDD, and a second terminal of the third capacitor C3 is connected to a fourth voltage terminal (e.g., the fourth voltage terminal may be a ground terminal, or a stable voltage terminal with a non-zero voltage value, etc.).
The following describes the operation of the power supply circuit of the present application with reference to the above example of the voltage conversion module 11:
as shown in fig. 4, the voltage converting unit 111 may also be referred to as a voltage converting unitA DC-DC conversion unit which can perform voltage conversion; the mode switching module 12, which may also be referred to as LDO/BYPASS switching module, can switch between a BYPASS mode, i.e., a pass-through mode, and a LDO mode, i.e., a voltage stabilizing mode, with a voltage drop V at its input and outputdrop(ii) a The voltage detection module 13 may detect the voltages of VPH _ PWR, ELVDD _ MID, and ELVDD. The control module 16 can control the output voltage of the DC-DC conversion unit by controlling the alternate turning on and off of the Q1, Q2 in the DC-DC conversion unit, and control the LDO/BYPASS switching module to switch between the LDO mode and the BYPASS mode.
Specifically, the voltage detection module 13 can detect the voltage difference V between VPH _ PWR and ELVDDdI.e. Vd＝VELVDD-VVPH_PWR. Will VdWith a predetermined threshold value Vth(e.g., V)th0.1V) comparison; if VdLess than or equal to VthThen the control module 16 can control the Q1, Q2 to alternatively turn on and off to raise the voltage of ELVDD _ MID to VELVDD+VdropAnd controlling the LDO/BYPASS module to switch to the LDO mode; if VdGreater than VthThe control module 16 can raise the voltage of the ELVDD _ MID to V by controlling the alternate turning on and off of the Q1 and the Q2ELVDDAnd controlling the LDO/BYPASS module to be switched to the BYPASS mode. Wherein, VELVDDThe voltage value is ELVDD, namely the target voltage; vVPH_PWRThe voltage value is VPH _ PWR, i.e. the first voltage inputted from the input terminal of the voltage conversion module 11.
As shown in fig. 5, as another implementation: the voltage conversion module 11 includes: a voltage conversion unit 111 and a switching unit 112.
The input end of the voltage conversion unit 111 is connected to the first power supply 14, and the output end of the voltage conversion unit 111 is connected to the input end of the mode switching module 12; the input end of the mode switching module 12 is connected to the second power supply 17 through the switch unit 112; the second power supply 17 outputs a fourth voltage, and the fourth voltage is greater than the target voltage;
when the difference between the first voltage and the second voltage is greater than a preset threshold, the switch unit 112 is in an off state, and the voltage conversion unit 111 is configured to convert the input first voltage into the target voltage and output the target voltage to the mode switching module 12; when the difference between the first voltage and the second voltage is smaller than or equal to the preset threshold, the voltage conversion unit 111 is in a non-operating state, the switch unit 112 is in a conducting state, and the fourth voltage output by the second power supply 17 is output as the target voltage through the mode switching module 12.
Alternatively, the second power supply 17 may be a power supply in the pixel circuit. For example: in the case that the pixel circuit is an AMOLED pixel circuit, the second power supply 17 may be a power supply for supplying power to a high voltage module inside the AMOLED pixel circuit, and the output voltage may be 7.6V; alternatively, the second power supply 17 may be another power supply in the pixel circuit, or the second power supply 17 may be another power supply outside the pixel circuit in the electronic device, or the second power supply 17 may also be a power supply included in the power supply circuit, and the like, which is not limited in this embodiment of the present application.
Optionally, the voltage conversion unit 111 may adopt a Boost circuit, or may also adopt a buck circuit, and specifically, the voltage conversion unit may be selected according to an input voltage, a voltage required to be output, and the like in an actual application scenario of the power supply circuit. If the voltage conversion unit 111 adopts a Boost voltage Boost circuit, the Boost voltage Boost circuit may adopt a circuit structure as shown in fig. 3, so that the voltage conversion unit 111 may output the target voltage to the mode switching module 12 by controlling the first switching tube Q1 and the second switching tube Q2 to be alternately turned on and off, that is, the voltage conversion unit 111 is in a working state; alternatively, the voltage converting unit 111 may be in a non-operating state by controlling both the first switching tube Q1 and the second switching tube Q2 to be turned off.
The following describes the operation of the power supply circuit of the present application with reference to the above example of the voltage conversion module 11:
as shown in FIG. 6, the voltage conversion unit 111 may also be providedSo as to be called a DC-DC conversion unit, voltage conversion can be performed; the mode switching module 12, which may also be referred to as LDO/BYPASS switching module, can switch between a BYPASS mode, i.e., a pass-through mode, and a LDO mode, i.e., a voltage stabilizing mode, with a voltage drop V at its input and outputdrop(ii) a The switching unit 112 may include a third switching tube Q3; the voltage detection module 13 may detect the voltages of VPH _ PWR, ELVDD _ MID, and ELVDD. The control module 16 may control the output voltage of the DC-DC conversion unit by controlling the alternate on and off of Q1, Q2 in the DC-DC conversion unit, or control the DC-DC conversion unit to be in a non-operating state by controlling both Q1, Q2 in the DC-DC conversion unit to be off, and control the on or off of Q3; the control module 16 may also control the LDO/BYPASS switch module to switch between the LDO mode and the BYPASS mode.
Specifically, the voltage detection module 13 can detect the voltage difference V between VPH _ PWR and ELVDDdI.e. Vd＝VELVDD-VVPH_PWR. Will VdWith a predetermined threshold value Vth(e.g., V)th0.1V) comparison; if VdLess than or equal to VthThen the control module 16 can turn off by controlling Q1, Q2, and Q3 to turn on, and control the LDO/BYPASS module to switch to LDO mode; if VdGreater than VthThe control module 16 can raise the voltage at the ELVDD _ MID terminal to V by controlling the alternate turning on and off of Q1, Q2, and Q3 to be offELVDDAnd controlling the LDO/BYPASS module to be switched to the BYPASS mode. Wherein, VELVDDThe voltage value is ELVDD, namely the target voltage; vVPH_PWRThe voltage value is VPH _ PWR, i.e. the first voltage inputted from the input terminal of the voltage conversion module 11.
In the above-mentioned solution of the present application, the mode switching module 12 (i.e. the LDO/BYPASS module) is disposed in the power supply circuit, when the voltage inputted by the power supply circuit (i.e. the voltage inputted by the VPH _ PWR terminal) is close to the voltage outputted by the power supply circuit (i.e. the voltage of ELVDD) (e.g. V:)ELVDD-VVPH_PWRVth) or less), the voltage conversion module 11 is controlled to increase the output voltage to VELVDD+VdropIn the guaranteed voltage conversion module 11The DC-DC converting unit is always in a synchronous mode (i.e. the switch tube in the DC-DC converting unit can be turned on or off under the control signal), and the mode switching module 12 (i.e. the LDO/BYPASS switching module) is controlled to be in the LDO mode to switch the voltage from VELVDD+VdropDown to VELVDDThereby ensuring that the output voltage maintains a stable state; when the voltage input by VPH _ PWR is lower, the control voltage conversion module 11 outputs a voltage VELVDDAnd controlling the LDO/BYPASS module to be in the BYPASS mode. In this way, by controlling the mode switching module 12 (i.e. LDO/BYPASS switching module) and the voltage conversion module 11, it is ensured that the DC-DC conversion unit in the voltage conversion module 11 is always in the synchronous mode, so that the output voltage is stable, and the problem of screen flashing caused by large input voltage float of VPH _ PWR is avoided.
The embodiment of the application further provides a display screen, which includes the power supply circuit, and can achieve the same technical effect of the power supply circuit, and for avoiding repetition, the details are not repeated here.
The embodiment of the present application further provides an electronic device, which includes the display screen as described above, that is, includes the power supply circuit as described above, and can achieve the same technical effects as those of the power supply circuit, and for avoiding repetition, details are not repeated here.
The power supply control method provided by the embodiment of the present application is described in detail below with reference to the accompanying drawings through specific embodiments and application scenarios thereof.
As shown in fig. 7, an embodiment of the present application provides a power supply control method, which is applied to the electronic device described above, and the method includes:
step 71: and acquiring a first voltage input by the input end of the voltage conversion module and a second voltage output by the output end of the mode switching module.
Optionally, a voltage detection module may detect a first voltage input by the input terminal of the voltage conversion module and a second voltage output by the output terminal of the mode switching module.
Step 72: and under the condition that the difference value of the first voltage and the second voltage is greater than a preset threshold value, controlling the voltage conversion module to output a target voltage to the mode switching module, and controlling the mode switching module to be in a through mode so as to output the target voltage.
Optionally, a manner of controlling the voltage conversion module to output the target voltage to the mode switching module and controlling the mode switching module to be in the through mode may refer to the above embodiment of the power supply circuit, and details are not repeated here to avoid repetition.
Step 73: under the condition that the difference value of the first voltage and the second voltage is smaller than or equal to the preset threshold value, controlling the voltage conversion module to output a third voltage to the mode switching module, and controlling the mode switching module to be in a voltage stabilization mode so as to output the target voltage; wherein the third voltage is greater than the target voltage.
Optionally, a manner of controlling the voltage conversion module to output the third voltage to the mode switching module and controlling the mode switching module to be in the voltage stabilization mode may refer to the above embodiment of the power supply circuit, and details are not repeated here to avoid repetition.
In the foregoing solution, when a difference between the first voltage and the second voltage is greater than a preset threshold, if the first voltage input by the input terminal of the voltage conversion module is low, the voltage conversion module may be controlled to output a target voltage, and the mode switching module may be controlled to output the target voltage to the pixel circuit in the through mode; when the difference value between the first voltage and the second voltage is smaller than or equal to a preset threshold value, namely the voltage of the input end of the voltage conversion module is close to the voltage of the output end of the mode switching module, the voltage conversion module is controlled to adjust the input voltage to obtain a third voltage higher than the target voltage, and the mode switching module is controlled to adjust the input third voltage in a voltage stabilization mode and output the voltage to the pixel circuit to be maintained at the target voltage, so that the output voltage is maintained in a stable state, and the problem that the voltage between a source electrode and a grid electrode of a transistor in the pixel circuit possibly shakes due to unstable voltage input by the voltage conversion module, and therefore the screen flicker is caused is solved.
Optionally, the obtaining a first voltage input by the input end of the voltage conversion module and a second voltage output by the output end of the mode switching module includes:
receiving a first input for triggering the display screen to be switched to a bright screen state under the condition that the display screen of the electronic equipment is in a screen-off state;
and responding to the first input, and detecting a first voltage input by the input end of the voltage conversion module and a second voltage output by the output end of the mode switching module.
The above power supply control method of the present application is described below with reference to specific examples:
the first embodiment is as follows: see the power supply circuit shown in fig. 4; as shown in fig. 8, the power supply control method according to the embodiment of the present application specifically includes:
step 810: in a standby or power-off state, when the AMOLED screen is not bright, a screen bright event is triggered to be generated after key operation and the like are received.
Step 811: the voltage detection module 13 detects the voltage difference V between VPH _ PWR and ELVDDd＝VELVDD-VVPH_PWR。
Step 812: will VdWith a predetermined threshold value Vth(e.g., 0.1V) comparison, if VdLess than or equal to VthThen go to step 813; otherwise, step 822 is performed.
Step 813: the control module 16 controls Q1 and Q2 to be alternately turned on and off to raise the voltage of ELVDD _ MID to VELVDD+Vdrop。
Step 814: the control module 16 controls the mode switching module 12 (i.e., the LDO/BYPASS switching module) to switch to the LDO mode.
Step 815: the ELVDD voltage is output and returns to step 811.
Step 822: the control module 16 controls the Q1, Q2 to be alternately turned on and off to raise the voltage of the ELVDD _ MID to the ELVDD voltage.
Step 823: the control module 16 controls the mode switching module 12 (i.e., the LDO/BYPASS switching module) to switch to the BYPASS mode.
Example two: see the power supply circuit shown in fig. 6; as shown in fig. 9, the power supply control method according to the embodiment of the present application includes:
step 910: in a standby or power-off state, when the AMOLED screen is not bright, a screen bright event is triggered to be generated after key operation and the like are received.
Step 911: the voltage detection module 13 detects the voltage difference V between VPH _ PWR and ELVDDd＝VELVDD-VVPH_PWR。
Step 912: will VdWith a predetermined threshold value Vth(e.g., 0.1V) comparison, if VdLess than or equal to VthOtherwise, go to step 913; otherwise, go to step 922.
Step 913: the control module 16 controls Q1, Q2 to be closed and Q3 to be opened.
Step 914: the control module 16 controls the mode switching module 12 (i.e., the LDO/BYPASS switching module) to switch to the LDO mode.
Step 915: the ELVDD voltage is output and returns to step 911.
Step 922: the control module 16 controls the Q3 to be turned off, and controls the Q1, the Q2 to be alternately turned on and off to raise the voltage of the ELVDD _ MID to the ELVDD voltage.
Step 923: the control module 16 controls the mode switching module 12 (i.e., the LDO/BYPASS switching module) to switch to the BYPASS mode.
It should be noted that, in the power supply control method provided in the embodiment of the present application, the execution main body may be a power supply control device, or a control module in the power supply control device for executing the power supply control method. In the embodiment of the present application, a method for a power supply control device to execute power supply control is taken as an example, and the power supply control device provided in the embodiment of the present application is described.
As shown in fig. 10, an embodiment of the present application further provides a power supply control apparatus 1000, which is applied to the electronic device described above, where the method includes:
an obtaining module 1010, configured to obtain a first voltage input by an input end of the voltage conversion module and a second voltage output by an output end of the mode switching module;
a first control module 1020, configured to control the voltage conversion module to output a target voltage to the mode switching module and control the mode switching module to be in a pass-through mode to output the target voltage when a difference between the first voltage and the second voltage is greater than a preset threshold;
a second control module 1030, configured to control the voltage conversion module to output a third voltage to the mode switching module and control the mode switching module to be in a voltage stabilizing mode to output the target voltage when a difference between the first voltage and the second voltage is smaller than or equal to the preset threshold; wherein the third voltage is greater than the target voltage.
Optionally, the obtaining module 1010 includes:
the receiving unit is used for receiving a first input for triggering the display screen of the electronic equipment to be switched to a bright screen state under the condition that the display screen of the electronic equipment is in a screen-off state;
and the response unit is used for responding to the first input, detecting a first voltage input by the input end of the voltage conversion module and a second voltage output by the output end of the mode switching module.
The power supply control device in the embodiment of the present application may be a device, or may be a component, an integrated circuit, or a chip in a terminal. The device can be mobile electronic equipment or non-mobile electronic equipment. By way of example, the mobile electronic device may be a mobile phone, a tablet computer, a notebook computer, a palm top computer, a vehicle-mounted electronic device, a wearable device, an ultra-mobile personal computer (UMPC), a netbook or a Personal Digital Assistant (PDA), and the like, and the non-mobile electronic device may be a server, a Network Attached Storage (NAS), a Personal Computer (PC), a Television (TV), a teller machine or a self-service machine, and the like, and the embodiments of the present application are not particularly limited.
The power supply control device in the embodiment of the present application may be a device having an operating system. The operating system may be an Android (Android) operating system, an IOS operating system, or other possible operating systems, which is not specifically limited in the embodiments of the present application.
The power supply control device provided in the embodiment of the present application can implement each process implemented by the method embodiments of fig. 7 to 9, and is not described here again to avoid repetition.
In the foregoing solution, when a difference between the first voltage and the second voltage is greater than a preset threshold, if the first voltage input by the input terminal of the voltage conversion module is low, the voltage conversion module may be controlled to output a target voltage, and the mode switching module may be controlled to output the target voltage to the pixel circuit in the through mode; when the difference value between the first voltage and the second voltage is smaller than or equal to a preset threshold value, namely the voltage of the input end of the voltage conversion module is close to the voltage of the output end of the mode switching module, the voltage conversion module is controlled to adjust the input voltage to obtain a third voltage higher than the target voltage, and the mode switching module is controlled to adjust the input third voltage in a voltage stabilization mode and output the voltage to the pixel circuit to be maintained at the target voltage, so that the output voltage is maintained in a stable state, and the problem that the voltage between a source electrode and a grid electrode of a transistor in the pixel circuit possibly shakes due to unstable voltage input by the voltage conversion module, and therefore the screen flicker is caused is solved.
Optionally, as shown in fig. 11, an electronic device 1100 is further provided in this embodiment of the present application, and includes a processor 1101, a memory 1102, and a program or an instruction that is stored in the memory 1102 and is executable on the processor 1101, and when the program or the instruction is executed by the processor 1101, the processes of the foregoing power supply control method embodiment are implemented, and the same technical effects can be achieved, and are not described again here to avoid repetition.
It should be noted that the electronic devices in the embodiments of the present application include the mobile electronic devices and the non-mobile electronic devices described above.
Fig. 12 is a schematic hardware structure diagram of an electronic device implementing an embodiment of the present application.
The electronic device 1200 includes, but is not limited to: radio frequency unit 1201, network module 1202, audio output unit 1203, input unit 1204, sensors 1205, display unit 1206, user input unit 1207, interface unit 1208, memory 1209, and processor 1210.
Those skilled in the art will appreciate that the electronic device 1200 may further comprise a power source (e.g., a battery) for supplying power to the various components, and the power source may be logically connected to the processor 1210 via a power management system, so as to implement functions of managing charging, discharging, and power consumption via the power management system. The electronic device structure shown in fig. 12 does not constitute a limitation of the electronic device, and the electronic device may include more or less components than those shown, or combine some components, or arrange different components, and thus, the description is not repeated here.
Optionally, the display unit 1206 may further include a power supply circuit as described above.
Wherein the processor 1210 is configured to: acquiring a first voltage input by an input end of the voltage conversion module and a second voltage output by an output end of the mode switching module; under the condition that the difference value of the first voltage and the second voltage is larger than a preset threshold value, controlling the voltage conversion module to output a target voltage to the mode switching module, and controlling the mode switching module to be in a through mode so as to output the target voltage; under the condition that the difference value of the first voltage and the second voltage is smaller than or equal to the preset threshold value, controlling the voltage conversion module to output a third voltage to the mode switching module, and controlling the mode switching module to be in a voltage stabilization mode so as to output the target voltage; wherein the third voltage is greater than the target voltage.
Optionally, the processor 1210 is further configured to: receiving a first input for triggering the display screen to be switched to a bright screen state under the condition that the display screen of the electronic equipment is in a screen-off state; and responding to the first input, and detecting a first voltage input by the input end of the voltage conversion module and a second voltage output by the output end of the mode switching module.
In the foregoing solution, when a difference between the first voltage and the second voltage is greater than a preset threshold, if the first voltage input by the input terminal of the voltage conversion module is low, the voltage conversion module may be controlled to output a target voltage, and the mode switching module may be controlled to output the target voltage to the pixel circuit in the through mode; when the difference value between the first voltage and the second voltage is smaller than or equal to a preset threshold value, namely the voltage of the input end of the voltage conversion module is close to the voltage of the output end of the mode switching module, the voltage conversion module is controlled to adjust the input voltage to obtain a third voltage higher than the target voltage, and the mode switching module is controlled to adjust the input third voltage in a voltage stabilization mode and output the voltage to the pixel circuit to be maintained at the target voltage, so that the output voltage is maintained in a stable state, and the problem that the voltage between a source electrode and a grid electrode of a transistor in the pixel circuit possibly shakes due to unstable voltage input by the voltage conversion module, and therefore the screen flicker is caused is solved.
It should be understood that, in the embodiment of the present application, the input Unit 1204 may include a Graphics Processing Unit (GPU) 12041 and a microphone 12042, and the Graphics Processing Unit 12041 processes image data of still pictures or videos obtained by an image capturing device (such as a camera) in a video capturing mode or an image capturing mode. The display unit 1206 may include a display panel 12061, and the display panel 12061 may be configured in the form of a liquid crystal display, an organic light emitting diode, or the like. The user input unit 1207 includes a touch panel 12071 and other input devices 12072. A touch panel 12071, also referred to as a touch screen. The touch panel 12071 may include two parts of a touch detection device and a touch controller. Other input devices 12072 may include, but are not limited to, a physical keyboard, function keys (e.g., volume control keys, switch keys, etc.), a trackball, a mouse, and a joystick, which are not described in detail herein. The memory 1209 may be used to store software programs as well as various data, including but not limited to application programs and an operating system. Processor 1210 may integrate an application processor, which handles primarily the operating system, user interface, applications, etc., and a modem processor, which handles primarily wireless communications. It is to be appreciated that the modem processor described above may not be integrated into processor 1210.
The embodiment of the present application further provides a readable storage medium, where a program or an instruction is stored on the readable storage medium, and when the program or the instruction is executed by a processor, the program or the instruction implements each process of the above power supply control method embodiment, and can achieve the same technical effect, and in order to avoid repetition, details are not repeated here.
The processor is the processor in the electronic device described in the above embodiment. The readable storage medium includes a computer readable storage medium, such as a Read-Only Memory (ROM), a Random Access Memory (RAM), a magnetic disk or an optical disk, and so on.
The embodiment of the present application further provides a chip, where the chip includes a processor and a communication interface, the communication interface is coupled to the processor, and the processor is configured to execute a program or an instruction to implement each process of the above power supply control method embodiment, and can achieve the same technical effect, and is not described herein again to avoid repetition.
It should be understood that the chips mentioned in the embodiments of the present application may also be referred to as system-on-chip, system-on-chip or system-on-chip, etc.
It should be noted that, in this document, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising an … …" does not exclude the presence of other like elements in a process, method, article, or apparatus that comprises the element. Further, it should be noted that the scope of the methods and apparatus of the embodiments of the present application is not limited to performing the functions in the order illustrated or discussed, but may include performing the functions in a substantially simultaneous manner or in a reverse order based on the functions involved, e.g., the methods described may be performed in an order different than that described, and various steps may be added, omitted, or combined. In addition, features described with reference to certain examples may be combined in other examples.
Through the above description of the embodiments, those skilled in the art will clearly understand that the method of the above embodiments can be implemented by software plus a necessary general hardware platform, and certainly can also be implemented by hardware, but in many cases, the former is a better implementation manner. Based on such understanding, the technical solutions of the present application may be embodied in the form of a computer software product, which is stored in a storage medium (such as ROM/RAM, magnetic disk, optical disk) and includes instructions for enabling a terminal (such as a mobile phone, a computer, a server, or a network device) to execute the method according to the embodiments of the present application.
While the present embodiments have been described with reference to the accompanying drawings, it is to be understood that the invention is not limited to the precise embodiments described above, which are meant to be illustrative and not restrictive, and that various changes may be made therein by those skilled in the art without departing from the spirit and scope of the invention as defined by the appended claims.

Claims (11)

1. A power supply circuit, comprising:
the input end of the voltage conversion module is connected with a first power supply;
the input end of the mode switching module is connected with the output end of the voltage conversion module, and the output end of the mode switching module is connected with the positive power supply end of the pixel circuit;
the voltage detection module is respectively connected with the input end of the voltage conversion module and the output end of the mode switching module; the voltage detection module is used for detecting a first voltage input by the input end of the voltage conversion module and a second voltage output by the output end of the mode switching module;
when the difference value between the first voltage and the second voltage is greater than a preset threshold value, the voltage conversion module is used for outputting a target voltage to the mode switching module, and the mode switching module is in a through mode and outputs the target voltage; under the condition that the difference value between the first voltage and the second voltage is smaller than or equal to the preset threshold value, the voltage conversion module is used for outputting a third voltage to the mode switching module, and the mode switching module is in a voltage stabilization mode and outputs the target voltage; wherein the third voltage is greater than the target voltage.
2. The power supply circuit of claim 1, wherein the voltage conversion module comprises:
the input end of the voltage conversion unit is connected with the first power supply, and the output end of the voltage conversion unit is connected with the input end of the mode switching module;
the input end of the mode switching module is connected with a second power supply through the switch unit; the second power supply outputs a fourth voltage, and the fourth voltage is greater than the target voltage;
the switching unit is in a disconnected state under the condition that the difference value between the first voltage and the second voltage is greater than a preset threshold value, and the voltage conversion unit is used for converting the input first voltage into the target voltage and outputting the target voltage to the mode switching module; and under the condition that the difference value between the first voltage and the second voltage is less than or equal to the preset threshold, the voltage conversion unit is in a non-working state, the switch unit is in a conducting state, and the fourth voltage output by the second power supply is output as the target voltage through the mode switching module.
3. The power supply circuit according to claim 2, wherein the second power supply is a power supply in the pixel circuit.
4. The power supply circuit of claim 1, wherein the mode switching module comprises:
the input end of the low-dropout linear voltage stabilizing unit is connected with the output end of the voltage conversion module, and the output end of the low-dropout linear voltage stabilizing unit is connected with the positive power supply end of the pixel circuit;
the input end of the through unit is connected with the output end of the voltage conversion module, and the output end of the through unit is connected with the positive power supply end of the pixel circuit;
in the direct connection mode, the low-dropout linear voltage stabilizing unit is in a non-working state, and the direct connection unit is in a working state; in the voltage stabilization mode, the straight-through unit is in a non-working state, and the low-dropout linear voltage stabilization unit is in a working state.
5. The power supply circuit according to any one of claims 1 to 4, further comprising:
the control module is respectively connected with the voltage conversion module and the mode switching module; the control module is used for controlling the output voltage of the voltage conversion module and controlling the mode switching module to switch between the direct-connection mode and the voltage stabilization mode.
6. A display screen, characterized in that it comprises a supply circuit as claimed in any one of claims 1 to 5.
7. An electronic device characterized by comprising a display screen according to claim 6.
8. A power supply control method applied to the electronic device according to claim 7, the method comprising:
acquiring a first voltage input by an input end of the voltage conversion module and a second voltage output by an output end of the mode switching module;
under the condition that the difference value of the first voltage and the second voltage is larger than a preset threshold value, controlling the voltage conversion module to output a target voltage to the mode switching module, and controlling the mode switching module to be in a through mode so as to output the target voltage;
under the condition that the difference value of the first voltage and the second voltage is smaller than or equal to the preset threshold value, controlling the voltage conversion module to output a third voltage to the mode switching module, and controlling the mode switching module to be in a voltage stabilization mode so as to output the target voltage; wherein the third voltage is greater than the target voltage.
9. The power supply control method according to claim 8, wherein the obtaining a first voltage input by an input terminal of the voltage conversion module and a second voltage output by an output terminal of the mode switching module comprises:
receiving a first input for triggering the display screen to be switched to a bright screen state under the condition that the display screen of the electronic equipment is in a screen-off state;
and responding to the first input, and detecting a first voltage input by the input end of the voltage conversion module and a second voltage output by the output end of the mode switching module.
10. An electronic device comprising a processor, a memory, and a program or instructions stored on the memory and executable on the processor, the program or instructions when executed by the processor implementing the steps of the power supply control method according to claim 8 or 9.
11. A readable storage medium, characterized in that it stores thereon a program or instructions which, when executed by a processor, implement the steps of the power supply control method according to claim 8 or 9.
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