CN115242090A - Power supply circuit, display screen and electronic equipment - Google Patents
Power supply circuit, display screen and electronic equipment Download PDFInfo
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- CN115242090A CN115242090A CN202210922120.1A CN202210922120A CN115242090A CN 115242090 A CN115242090 A CN 115242090A CN 202210922120 A CN202210922120 A CN 202210922120A CN 115242090 A CN115242090 A CN 115242090A
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- power supply
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- 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
- H02M3/158—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 including plural semiconductor devices as final control devices for a single load
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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]
- G09G3/3225—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] using an active matrix
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J7/00—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
- H02J7/0063—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries with circuits adapted for supplying loads from the battery
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J2207/00—Indexing scheme relating to details of circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
- H02J2207/20—Charging or discharging characterised by the power electronics converter
Abstract
The application discloses supply circuit, display screen and electronic equipment, this supply circuit includes: the input end of the voltage control module is connected with a power supply voltage; the output end of the voltage control module outputs pixel driving voltage; wherein the voltage control module has a buck mode; when the voltage control module works in the voltage reduction mode, the voltage value of the pixel driving voltage is smaller than the voltage value of the power supply voltage accessed by the input end.
Description
Technical Field
The application belongs to the technical field of electricity, and in particular relates to a power supply circuit, a display screen and electronic equipment.
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. As shown in fig. 1, the power supply circuit for supplying power to ELVDD can obtain power when the electronic device is charged by the charging device, when the charging capacity 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, which affects the current (Iled) of the light emitting diode, thereby possibly causing the problem of screen flashing.
Disclosure of Invention
The embodiment of the application aims to provide a power supply circuit, a display screen and an electronic device, and the problem that the power supply circuit supplying power to a pixel circuit possibly causes screen flashing when the charging electric quantity is high at present can be solved.
In a first aspect, an embodiment of the present application provides a power supply circuit, including:
the input end of the voltage control module is connected with a power supply voltage; the output end of the voltage control module outputs pixel driving voltage;
wherein the voltage control module has a buck mode; when the voltage control module works in the voltage reduction mode, the voltage value of the pixel driving voltage is smaller than the voltage value of the power supply voltage accessed by the input end.
In a second aspect, the present application provides a display screen, including the power supply circuit as described above.
In a third aspect, an embodiment of the present application provides an electronic device, which includes the display screen as described above.
In this embodiment, the power supply circuit for outputting the pixel driving voltage includes a voltage control module, and the voltage control module has a voltage reduction mode, so that the voltage value of the pixel driving voltage is smaller than the voltage value of the power supply voltage accessed by the input terminal, thereby avoiding that when the charging capacity is higher (i.e. the power supply voltage is higher), the voltage at the output terminal of the power supply circuit affects the current of the light emitting diode along with the voltage rise at the input terminal, so as to solve the problem of the flash screen.
Drawings
FIG. 1 is a schematic diagram of a power supply circuit;
FIG. 2 is a schematic diagram of a pixel circuit;
FIG. 3 is a schematic diagram of a power supply circuit synchronization pattern for a pixel circuit;
FIG. 4 is a schematic diagram of an asynchronous mode of a power supply circuit for a pixel circuit;
FIG. 5 is one of the block diagrams of the power supply circuit of an embodiment of the present application;
FIG. 6 is a second block diagram of a power supply circuit according to an embodiment of the present application;
FIG. 7 is a third block diagram of a power supply circuit according to an embodiment of the present application;
FIG. 8 is a fourth block diagram of a power supply circuit of an embodiment of the present application;
FIG. 9 is a circuit schematic of a power supply circuit of an embodiment of the present application;
FIG. 10 is a circuit diagram of a power supply circuit in a buck mode according to an embodiment of the present application;
FIG. 11 is a circuit diagram of a power supply circuit in a boost mode according to an embodiment of the present application;
FIG. 12 is a circuit schematic of a power supply circuit of an embodiment of the present application in a pass-through mode;
fig. 13 is a control flowchart of the electronic device according to the embodiment of the present application.
Detailed Description
The technical solutions in the embodiments of the present application will be described clearly 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 that can be derived by one of ordinary skill in the art from the embodiments given herein are intended to be within the scope of the present disclosure.
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.
As shown in fig. 2, a schematic diagram of a pixel circuit, which is an Active-matrix organic light-emitting diode (AMOLED) pixel circuit, is shown. Wherein, ELV DD The source of the driving transistor T1 is connected, and the drain of the driving transistor T1 is connected to ELVss via the light emitting element. The gate of the driving transistor is connected to a scanning signal Gn. ELV DD The voltage jitter of (2) can affect the Vgs voltage of T1, and the MOSFET works in the constant current region, so the jitter of Vgs can affect I led Resulting in a flickering screen, ELVDD is therefore often sensitive to ripple and transient disturbances. Wherein, ELV DD Is the AMOLED driving positive power supply terminal with the input ofA fixed voltage, typically 4.6V; ELV SS Is the AMOLED driving negative power supply terminal.
As continued reference to fig. 1, during charging, VPH _ PWR is powered by the charger, so VPH _ PWR = V BATT +I*RQ BAT . Wherein BATT is a battery; VPH _ PWR is a system power supply; q BAT Is V BATT And the impedance of the MOS tube between the VPH _ PWR and the voltage regulator is RQ after the MOS tube is conducted BAT 。
When the battery power is high, VPH _ PWR is close to ELVDD voltage driven by the AMOLED, the ELVDD power supply circuit changes from the synchronous mode to the asynchronous mode (equivalent to the Q1 transistor being normally on), and the ELVDD voltage rises along with VPH _ PWR. A schematic diagram of a power supply circuit synchronous mode of a pixel circuit is given as shown in fig. 3, and a schematic diagram of a power supply circuit asynchronous mode of a pixel circuit is given as shown in fig. 4. When the ELVDD voltage reaches the threshold value, the power supply circuit stops the switching operation, and the ELVDD voltage drops to affect the Vgs voltage and Iled current inside the AMOLED screen, so that the AMOLED screen flickers.
The embodiment of the invention provides a power supply circuit, a display screen and electronic equipment, which can solve the problem that the current power supply circuit for supplying power to a pixel circuit possibly causes screen flashing when the charging electric quantity is higher.
As shown in fig. 5, an embodiment of the present invention provides a power supply circuit, which includes a voltage control module 1, where an input end of the voltage control module 1 is connected to a power supply voltage; the output end of the voltage control module 1 outputs a pixel driving voltage;
wherein the voltage control module 1 has a buck mode; when the voltage control module 1 works in the voltage reduction mode, the voltage value of the pixel driving voltage is smaller than the voltage value of the power voltage accessed by the input end.
For example: the power supply circuit can be applied to a pixel circuit of a display screen for supplying power, namely, an input end of the voltage control module 1 can be used for being connected with a first power supply 3, the first power supply 3 can output power voltage, and an output end of the voltage control module 1 can be used for being connected with a pixel circuit 2 and outputting pixel driving voltage to the pixel circuit 2.
Optionally, the power supply circuit is applied to an electronic device, and the first power source 3 may be a system power source of the electronic device, that is, the first power source 3 may be a power supply module in the electronic device for providing electric energy to the power supply circuit. For example: the power supply circuit may be connected to a power supply module in the electronic device, where the power supply module may obtain electric energy through a charger or other external power supply devices, or may obtain electric energy through a storage battery in the electronic device, and the like, and the embodiment of the present application is not limited thereto.
Optionally, the pixel circuit 2 may be an Active-matrix organic light-emitting diode (AMOLED) pixel circuit; of course, the embodiments of the present application are not limited thereto.
In the above scheme, the power supply circuit for outputting the pixel driving voltage includes a voltage control module, and the voltage control module has a voltage reduction mode, so that the voltage value of the pixel driving voltage is smaller than the voltage value of the power supply voltage accessed by the input terminal, thereby avoiding that the current of the light emitting diode is influenced by the voltage of the output terminal of the power supply circuit following the voltage rise of the input terminal when the charging capacity is higher (namely, the power supply voltage is higher), and solving the problem of the splash screen.
Optionally, the voltage control module 1 further comprises at least one of a pass-through mode and a boost mode;
when the voltage control module 1 works in the boost mode, the voltage value of the pixel driving voltage is greater than the voltage value of the power supply voltage accessed by the input end; when the voltage control module 1 works in the through mode, the voltage value of the pixel driving voltage is equal to the voltage value of the power voltage accessed by the input end.
In this embodiment, the voltage control module 1 may have a buck mode and a boost mode, and the voltage control module 1 may switch between the buck mode and the boost mode; alternatively, the voltage control module 1 may have a buck mode and a pass-through mode, and the voltage control module 1 may be directly switched between the buck mode and the pass-through mode; or, the voltage control module 1 may further have a buck mode, a boost mode, and a pass-through mode, and the voltage control module 1 may switch between any two of the buck mode, the boost mode, and the pass-through mode, which is not limited in this embodiment.
As an implementation manner, the voltage control module 1 has a step-down mode, and in case that the voltage value of the power supply voltage is greater than the voltage value of the pixel driving voltage, the voltage control module 1 is in the step-down mode. Such as: the voltage control module 1 can only work under the condition that the voltage value of the power supply voltage is larger than the voltage value of the pixel driving voltage; in the case where the voltage value of the power supply voltage is less than or equal to the voltage value of the pixel driving voltage, other power supply circuits (such as a power supply circuit having a boost mode and a through mode) may be employed to output the pixel driving signal to the pixel circuit 2, so that the pixel driving circuit can obtain a stable input voltage; or, when the voltage value of the power supply voltage is equal to the voltage value of the pixel driving voltage, a pass-through module (which may be implemented by a switch connected between the first power supply 3 and the pixel circuit 2) is used to operate, and when the voltage value of the power supply voltage is smaller than the voltage value of the pixel driving voltage, another power supply (such as a voltage boosting circuit) is used to output the pixel driving signal to the pixel circuit 2, so that the pixel driving circuit can obtain a stable input voltage, and the like.
As another implementation: the voltage control module 1 has a buck mode and a pass-through mode, and the voltage control module 1 is in the buck mode when the voltage value of the power supply voltage is greater than the voltage value of the pixel driving voltage; in case the voltage value of the supply voltage is equal to the voltage value of the pixel driving voltage, the voltage control module 1 is in the through-mode. Such as: the voltage control module 1 may operate only when the voltage value of the power supply voltage is greater than or equal to the voltage value of the pixel driving voltage, and may not operate when the voltage value of the power supply voltage is less than the voltage value of the pixel driving voltage, but may output the pixel driving signal to the pixel circuit 2 by using other power supply (e.g., a voltage boosting circuit), so that the pixel driving circuit may obtain a stable input voltage, etc.
As another implementation: the voltage control module 1 has a buck mode and a boost mode, and the voltage control module 1 is in the buck mode when the voltage value of the power supply voltage is greater than the voltage value of the pixel driving voltage; in the case where the voltage value of the power supply voltage is smaller than the voltage value of the pixel driving voltage, the voltage control module 1 is in the boosting mode. Such as: the voltage control module 1 may operate only when the voltage value of the power supply voltage is greater than or less than the voltage value of the pixel driving voltage, and may not operate when the voltage value of the power supply voltage is equal to the voltage value of the pixel driving voltage, but may operate using a pass-through module (e.g., may be implemented by a switch connected between the first power supply 3 and the pixel circuit 2) to enable the pixel driving circuit to obtain a stable input voltage, etc.
As yet another implementation: the voltage control module 1 has a buck mode, a boost mode and a pass-through mode, and the voltage control module 1 is in the buck mode when the voltage value of the power supply voltage is greater than the voltage value of the pixel driving voltage; in the case where the voltage value of the power supply voltage is smaller than the voltage value of the pixel driving voltage, the voltage control module 1 is in the boosting mode; in case the voltage value of the supply voltage is equal to the voltage value of the pixel driving voltage, the voltage control module 1 is in the through mode.
As shown in fig. 6, a schematic diagram of yet another power supply circuit is provided, the power supply circuit comprising: a voltage control module 1 and a voltage detection module 4.
As an implementation manner, the input end of the voltage control module 1 is connected to a power supply voltage; the output end of the voltage control module 1 outputs a pixel driving voltage; the voltage detection module 4 is connected to the input end and the output end of the voltage control module 1, and the voltage detection module 4 is used for detecting the power voltage input by the input end of the voltage control module 1 and the output pixel driving voltage.
For example: the power supply circuit is applied to the condition that the pixel circuit of the display screen supplies power, the power supply circuit can be controlled by a controller externally arranged on the display screen, the voltage detection module 4 can be connected with the controller, and the controller can control the working mode of the power supply circuit according to the power supply voltage and the pixel driving voltage detected by the voltage detection module. Such as: under the condition that the voltage value of the power supply voltage is greater than the voltage value of the pixel driving voltage, the controller controls the voltage control module 1 to be in the voltage reduction mode; in the case that the voltage control module 1 further includes a through mode, and the voltage value of the power supply voltage is equal to the voltage value of the pixel driving voltage, the controller controls the voltage control module 1 to be in the through mode; when the voltage control module 1 further includes a boost mode and the voltage value of the power supply voltage is smaller than the voltage value of the pixel driving voltage, the controller controls the voltage control module 1 to be in the boost mode.
As a further implementation manner, the input end of the voltage control module 1 is used for connecting a first power supply 3, i.e. an input power supply voltage; the output end of the voltage control module 1 is used for connecting the positive power supply end of the pixel circuit 2, namely outputting pixel driving voltage; the voltage detection module 4 is connected to the input end of the voltage control module 1, and the voltage detection module 4 is configured to detect a power supply voltage input by the input end of the voltage control module 1.
Wherein, when the power voltage is greater than a target voltage, the voltage control module 1 is in a buck mode, and the voltage control module 1 outputs the target voltage in the buck mode; when the power supply voltage is lower than the target voltage, the voltage control module 1 is in a boost mode, and the voltage control module 1 outputs the target voltage in the boost mode; in a case where the power supply voltage is equal to the target voltage, the voltage control module 1 is in a through mode, and the voltage control module 1 outputs the target voltage in the through mode.
Optionally, the voltage detection module 4 is further connected to the output end of the voltage control module 1, and the voltage detection module 4 is further configured to detect a pixel driving voltage output by the output end of the voltage control module 1; the logic control module 5 is further configured to adjust a duty ratio of the control signal according to the voltage value of the pixel driving voltage detected by the voltage detection module 4.
For example: in the step-down mode, by detecting the pixel driving voltage at the output end of the voltage control module 1, if the pixel driving voltage is not equal to the target voltage, the duty ratio of the control signal may be adjusted, that is, the charging and discharging time of the energy storage element 12 is adjusted, so that the output voltage of the voltage control module 1 is maintained at the target voltage. Correspondingly, in the boost mode, the pixel driving voltage at the output end of the voltage control module 1 may also be detected, and if the pixel driving voltage is not equal to the target voltage, the duty ratio of the control signal may be adjusted, that is, the charging and discharging time of the energy storage element 12 may be adjusted, so that the output voltage of the voltage control module 1 is maintained at the target voltage.
Optionally, the target voltage is a voltage required by a positive power supply terminal of the pixel circuit 2, for example: the voltage required by the positive power supply terminal of the AMOLED pixel circuit is 4.6V.
Optionally, the voltage control module 1 has a buck mode, or the voltage control module 1 has at least one of a pass-through mode and a boost mode in addition to the buck mode. For example: taking the voltage control module 1 having the buck mode, the boost mode and the through mode as an example, when the power supply voltage at the input end of the voltage control module 1 is greater than the target voltage set by the pixel circuit 2, the voltage control module 1 operates in the buck mode (or called buck mode); when the power voltage at the input end of the voltage control module 1 is lower than the target voltage set by the pixel circuit 2, the voltage control module 1 works in a boost mode (or called boost mode); when the power voltage at the input terminal of the voltage control module 1 is equal to the target voltage set by the pixel circuit 2, the voltage control module 1 operates in a pass mode (or referred to as pass mode).
When the voltage control module 1 is in the buck mode or the boost mode, the voltage control module works in the synchronous mode, the output voltage can be stabilized at the target voltage, and the ripple is small. Optionally, the through mode refers to a mode in which the voltage input by the voltage control module 1 is the same as the voltage output by the voltage control module 1, that is, when the voltage input by the voltage control module 1 is a target voltage, the voltage control module can output the target voltage; the voltage reduction mode is a mode in which the voltage control module 1 reduces and regulates the input voltage and maintains the output voltage as a target voltage; the boost mode is a mode in which the voltage control module 1 boosts and regulates an input voltage and maintains an output voltage at a target voltage.
In the above scheme, the power supply circuit arranged at the positive power supply end of the pixel circuit 2 includes a voltage control module 1 and a voltage detection module 4, the voltage detection module 4 detects a power supply voltage at the input end of the voltage control module 1, and when the power supply voltage is greater than a target voltage, the voltage control module 1 is in a step-down mode and outputs the target voltage; when the power supply voltage is lower than the target voltage, the voltage control module 1 is in a boost mode and outputs the target voltage; under the condition that the power supply voltage is equal to the target voltage, the voltage control module 1 is in a through mode and outputs the target voltage, so that the voltage of the positive power supply end of the pixel circuit 2 can be maintained as the target voltage through the power supply circuit, that is, the voltage of the positive power supply end of the pixel circuit 2 is ensured to be 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 2 is possibly jittered and a flash screen is generated due to unstable voltage input by the power supply circuit of the pixel circuit 2 at present is solved.
As shown in fig. 7, as one implementation: the voltage control module 1 includes: a switching unit 11 and an energy storage element 12.
A first connection end of the switch unit 11 is used for inputting a power supply voltage (for example, the first connection end is used for connecting the first power supply 3), a second connection end of the switch unit 11 is used for connecting a positive power supply end of the pixel circuit 2, and a third connection end of the switch unit 11 is connected with the first voltage end; a first end of the energy storage element 12 is connected to the first power supply 3 and the first voltage end through the switch unit 11, and a second end of the energy storage element 12 is connected to the positive power supply end of the pixel circuit 2 and the first voltage end through the switch unit 11.
Wherein, when the switch unit 11 is switched between a first conducting state and a second conducting state, the voltage control module 1 is in the step-down mode; when the switch unit 11 is switched between the first conducting state and the third conducting state, the voltage control module 1 is in the boost mode; in case the switching unit 11 is only in the first conducting state, the voltage control module 1 is in the through mode.
In the first conduction state, the first connection end is conducted with the second connection end through the energy storage element 12; in the second conduction state, the third connection terminal is conducted with the second connection terminal through the energy storage element 12; in the third conduction state, the first connection terminal is conducted with the third connection terminal through the energy storage element 12.
Optionally, the energy storage element 12 may be an inductor or an inductor component or other elements or components for storing energy, and the embodiment of the invention is not limited thereto.
Optionally, the first voltage terminal may be a ground terminal, or a stable voltage terminal with a non-zero voltage value (e.g., a stable voltage terminal with a low level), and the like.
Specifically, when the switch unit 11 is in the first conduction state, the first connection end is conducted with the second connection end through the energy storage element 12, the energy storage element 12 is charged, the third connection end is conducted with the second connection end through the energy storage element 12, and the energy storage element 12 is discharged, so that when the switch unit 11 is alternately switched between the first conduction state and the second conduction state, the voltage reduction function is realized. Correspondingly, when the switch unit 11 is in the first conduction state, the first connection end is conducted with the second connection end through the energy storage element 12, the energy storage element 12 is charged, when the switch unit 11 is in the third conduction state, the first connection end is conducted with the third connection end through the energy storage element 12, and the energy storage element 12 discharges, so that when the switch unit 11 is alternately switched between the first conduction state and the third conduction state, the boosting function is realized. Under the condition that the switch unit 11 is always in the first conduction state, the first connection end is always conducted with the second connection end through the energy storage element 12, so that the circuit is directly connected.
Optionally, the switch unit 11 further includes a control terminal, and the control terminal is used for inputting a control signal; wherein the control signal is used for controlling the conducting state of the switch unit 11.
Specifically, the control signal may be used to control the switching unit 11 to alternately switch between the first conducting state and the second conducting state, that is, to implement the buck mode; or controlling the switching unit 11 to switch between the first conduction state and the third conduction state alternately, namely, implementing the boost mode; or controlling the switching unit 11 to be always in the first conducting state, i.e. implementing the through mode.
Optionally, as shown in fig. 8, the power supply circuit further includes: the logic control module 5 is connected with the voltage control module 1;
the logic control module 5 outputs a control signal, the voltage control module 1 is in a step-down mode under the action of the control signal, or the voltage control module 1 is switched between the step-down mode and other modes under the action of the control signal; wherein the other mode is at least one of a boost mode and a buck mode.
Alternatively, the logic control module 5 may be a digital logic control circuit, as shown in fig. 7, and the digital logic control circuit may be connected to the control terminal of the switch unit 11, and the logic control module 5 outputs a control signal to the switch unit.
Optionally, the power supply circuit further includes: the voltage detection module 4 is connected with the input end of the voltage control module 1, the output end of the voltage control module 1 and the logic control module 5 respectively;
the voltage detection module 4 detects a voltage value of the power supply voltage and a voltage value of the pixel driving voltage, and feeds the voltage values of the power supply voltage and the pixel driving voltage back to the logic control module 5;
the logic control module 5 outputs a control signal to control the voltage control module 1 to be in the step-down mode when the voltage value of the power supply voltage is greater than the voltage value of the pixel driving voltage; in the case that the voltage control module 1 further includes a through mode, the logic control module 5 controls the voltage control module 1 to be in the through mode by a control signal output in the case that the voltage value of the power supply voltage is equal to the voltage value of the pixel driving voltage; in a case where the voltage control module 1 further includes a boost mode, the logic control module 5 controls the voltage control module 1 to be in the boost mode according to a control signal output when the voltage value of the power supply voltage is equal to the voltage value of the pixel driving voltage.
Optionally, the logic control module 5 is a digital logic control circuit, and the digital logic control circuit may adopt ACM adaptive coding modulation, and is configured to output a control signal to the voltage control module 1 according to the power supply voltage and the pixel driving voltage detected by the voltage detection module 4, so as to control the voltage control module 1 to be in the buck mode, or control the voltage control module 1 to switch between the buck mode and another mode. As still referring to fig. 7, the control signal may control the switching unit 11 to alternately switch between the first conducting state and the second conducting state, i.e. to implement the step-down mode; or controlling the switching unit 11 to alternately switch between the first conduction state and the third conduction state, that is, implementing the boost mode; or controlling the switching unit 11 to be always in the first conducting state, i.e. implementing the through mode.
Optionally, as an implementation manner, the logic control module 5 and the voltage detection module 4 may be integrally disposed, for example, the integrally disposed logic control module 5 and the voltage detection module 4 may be packaged in the power supply circuit. Or as another implementation manner, the logic control module 5 and the voltage detection module 4 may also be disposed outside the power supply circuit (for example, integrated on a motherboard of an electronic device), and the like.
Further, the logic control module 5 processes a voltage value that can compare a power supply voltage and a pixel driving voltage, and controls the voltage control module 1 to be in a step-down mode, or controls the voltage control module 1 to switch between the step-down mode and another mode, and the logic control module 5 is configured to adjust a duty ratio of the control signal according to a difference between the voltage value of the pixel driving voltage and a target value, so that the voltage value of the pixel driving voltage is always maintained at a stable value, where the target value may be a voltage value of a voltage required by a positive power supply terminal of the pixel circuit 2, for example: the voltage value of the voltage required by the positive power supply end of the AMOLED pixel circuit is 4.6V.
Alternatively, as shown in fig. 9, the voltage control module 1 includes: a first control switch 111, a second control switch 112, a third control switch 113, a fourth control switch 114 and the energy storage element 12; wherein the content of the first and second substances,
a first end of the first control switch 111 is connected to the power supply voltage, a second end of the first control switch 111 is connected to a first end of the second control switch 112 through the energy storage element 12, a second end of the second control switch 112 outputs the pixel driving voltage, a first end of the third control switch 113 is connected to a second end of the first control switch 111, a first end of the fourth control switch 114 is connected to a first end of the second control switch 112, and a second end of the third control switch 113 and a second end of the fourth control switch 114 are respectively connected to a first voltage end;
a control terminal of the first control switch 111 is connected to a first control signal, a control terminal of the second control switch 112 is connected to a second control signal, a control terminal of the third control switch 113 is connected to a third control signal, and a control terminal of the fourth control switch 114 is connected to a fourth control signal.
Optionally, when the second control switch 112 is in a conducting state, the fourth control switch 114 is in a closing state, and the first control switch 111 and the third control switch 113 are alternately in a conducting state, the voltage control module 1 is in the step-down mode; for example: the second control signal is a continuous high level signal or a low level signal, so as to enable the second control switch 112 to be continuously in a conducting state, that is, to be normally open (specifically, a high level signal or a low level signal is adopted depending on a type of a transistor adopted by the second control switch 112, and this embodiment of the present application is not specifically limited); the fourth control signal is a continuous low level or high level signal to realize that the fourth control switch 114 is continuously in a closed state, i.e. normally closed (specifically, a low level signal or a high level signal depends on the type of the transistor used by the fourth control switch 114, and the embodiment of the present application is not particularly limited); the first control signal and the third control signal are pulse signals, and the third control signal is at a low level when the first control signal is at a high level, so that the first control switch 111 and the third control switch 113 are alternately in a conducting state.
The second control switch is in a conducting state, the third control switch is in a closing state, and the voltage control module 1 is in a boosting mode under the condition that the first control switch and the fourth control switch are alternately in the conducting state; for example: the second control signal is a continuous high level or low level signal to realize that the second control switch 112 is continuously in a conducting state, i.e. normally open; the third control signal is a continuous low level or high level signal to realize that the third control switch 113 is continuously in a closed state, i.e. normally closed; the first control signal and the fourth control signal are pulse signals, and when the first control signal is at a high level, the fourth control signal is at a low level, so that the first control switch 111 and the fourth control switch 114 are alternately in a conducting state.
The voltage control module 1 is in a through mode under the condition that the first control switch and the second control switch are both in a conducting state and the third control switch and the fourth control switch are both in a closing state; for example: the first control signal and the second control signal are continuous high level or low level signals to realize that the first control switch 111 and the second control switch 112 are continuously in a conducting state, namely normally open; the third control signal and the fourth control signal are continuously low level or high level signals to realize that the third control switch 113 and the fourth control switch 114 are continuously in the closed state, i.e. normally closed.
Optionally, the first control signal, the second control signal, the third control signal, and the fourth control signal may be output by the logic control module 5, that is, the control signal output by the logic control module 5 may include the first control signal, the second control signal, the third control signal, and the fourth control signal.
Further, in the step-down mode, the logic control module 5 may further adjust duty ratios of the first control signal and the third control signal according to the voltage value of the pixel driving voltage and the target value, so that the voltage value of the pixel driving voltage is maintained at the target value. In the boost mode, the logic control module 5 may further adjust the duty ratios of the first control signal and the fourth control signal according to the voltage value of the pixel driving voltage and the target value, so that the voltage value of the pixel driving voltage is maintained at the target value.
As one implementation manner, the first control switch 111 and the second control switch 112 are both P-type transistors; the third control switch 113 and the fourth control switch 114 are both N-type transistors; the transistor may be a MOS transistor, a TFT transistor, or the like. Of course, the switch unit in the embodiment of the present invention may also be implemented by using other transistors, and the embodiment of the present invention is not limited thereto.
The first end of the first control switch 111 and the first end of the second control switch 112 are both sources of the P-type transistor; a second end of the first control switch 111 and a second end of the second control switch 112 are both drains of the P-type transistors; the control terminals of the first control switch 111 and the second control switch 112 are both gates of the P-type transistor.
Wherein, the first terminal of the third control switch 113 and the first terminal of the fourth control switch 114 are both drains of the N-type transistor; a second terminal of the third control switch 113 and a second terminal of the fourth control switch 114 are both sources of the N-type transistor; the control terminals of the third control switch 113 and the fourth control switch 114 are both the gates of the N-type transistors.
The operation of the switching unit 11 according to the embodiment of the present invention will be described below with reference to the accompanying drawings:
as shown in fig. 10, in the step-down mode, the fourth control switch 114 is normally closed, the second control switch 112 is normally open, and the step-down function is realized by controlling the first control switch 111 and the third control switch 113 to be periodically and alternately turned on and off. If the first control switch 111 is turned on and the third control switch 113 is turned off, the energy storage element 12 (i.e., the inductor L) is charged; the first control switch 111 is turned off and the third control switch 113 is turned on, at which time the energy storage element 12 (i.e., the inductor L) is discharged.
As shown in fig. 11, in the boost mode, the third control switch 113 is normally closed, the second control switch 112 is normally open, and the boost function is realized by controlling the first control switch 111 and the fourth control switch 114 to be periodically and alternately turned on and off. If the first control switch 111 is turned on and the fourth control switch 114 is turned off, the energy storage element 12 (i.e., the inductor L) is charged; the first control switch 111 is turned off, and the fourth control switch 114 (i.e., Q4) is turned on, at which time the energy storage element 12 (i.e., the inductor L) is discharged.
As shown in fig. 12, in the through mode, the third control switch 113 and the fourth control switch 114 are both normally closed, the first control switch 111 and the second control switch 112 are both normally open, the circuit is through, and the output voltage is approximately equal to the input voltage.
It should be noted that the logic control module 5 may be provided independently from the voltage detection module 4, or may be provided integrally with the voltage detection module 4. Alternatively, the logic control module 5 may adopt ACM adaptive coding modulation, and the voltage detection module 4 may be an analog-to-digital conversion (DAC) module.
It should be noted that the logic control module 5 and the voltage detection module 4 in the embodiment of the present invention may also be separately and independently disposed outside the power supply circuit, or may also be integrally disposed outside the power supply circuit, such as being separately or integrally disposed on a main board or a sub-board of the electronic device.
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.
An embodiment of the present application further provides an electronic device, including the display screen as described above, that is, including the power supply circuit as described above, and capable of achieving the same technical effects as those of the power supply circuit, and in order to avoid repetition, details are not repeated here.
As shown in fig. 13, a control flow chart of an electronic device using the power supply circuit is provided, which specifically includes the following steps:
step 101: in a standby or power-off state, the AMOLED screen is not bright, the process does not start, and the next step is carried out only when a screen-bright event is triggered by a key and the like.
Step 102: the DAC (i.e., the voltage detection module 4) collects the input and output voltages, converts the input and output voltages into digital signals, and sends the digital signals to the ACM digital logic unit (i.e., the logic control module 5), and the digital logic unit monitors the input and output voltages and compares the input and output voltages.
Step 103: judging the relation between VPH _ PWR and ELVDD, if VPH _ PWR is larger than ELVDD, entering step 105 if VPH _ PWR is larger than ELVDD; otherwise step 104 is entered.
Step 104: if VPH _ PWR is less than ELVDD, then step 106 is entered, otherwise step 107 is entered.
Step 105: the circuit switches to BUCK mode (i.e., BUCK mode) and flow returns to 102 to continue monitoring the input and output voltages.
Step 106: the circuit switches to BOOST mode (i.e., BOOST mode) and flow returns to 102 to continue monitoring the input and output voltages.
Step 107: the circuit switches to PASS mode operation (i.e., PASS-through mode) and flow returns to 102 to continue monitoring the input and output voltages.
The working states of the circuits in steps 105, 106, and 107 may refer to the above embodiments, and are not described herein again to avoid repetition.
The embodiments in the present specification are described in a progressive manner, each embodiment focuses on differences from other embodiments, and the same and similar parts among the embodiments are referred to each other.
While preferred embodiments of the present application have been described, additional variations and modifications of these embodiments may occur to those skilled in the art once they learn of the basic inventive concepts. Therefore, it is intended that the appended claims be interpreted as including the preferred embodiment and all such alterations and modifications as fall within the true scope of the embodiments of the application.
Finally, it should be further noted that the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or terminal 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 terminal. Without further limitation, an element defined by the phrase "comprising a … …" does not exclude the presence of another identical element in a process, method, article, or terminal apparatus that comprises the element.
While the foregoing is directed to the preferred embodiment of the present application, it will be understood by those skilled in the art that various changes and modifications may be made without departing from the principles of the disclosure and, therefore, the scope of the disclosure is to be defined by the appended claims.
Claims (10)
1. A power supply circuit, comprising:
the input end of the voltage control module is connected with a power supply voltage; the output end of the voltage control module outputs pixel driving voltage;
wherein the voltage control module has a buck mode; when the voltage control module works in the voltage reduction mode, the voltage value of the pixel driving voltage is smaller than the voltage value of the power supply voltage accessed by the input end.
2. The power supply circuit of claim 1 wherein said voltage control module further comprises at least one of a pass-through mode and a boost mode;
when the voltage control module works in the boost mode, the voltage value of the pixel driving voltage is greater than the voltage value of the power supply voltage accessed by the input end;
when the voltage control module works in the direct-through mode, the voltage value of the pixel driving voltage is equal to the voltage value of the power supply voltage accessed by the input end.
3. The power supply circuit of claim 1,
the voltage control module is in the step-down mode under the condition that the voltage value of the power supply voltage is larger than the voltage value of the pixel driving voltage;
in the case where the voltage control module further includes a through mode and the voltage value of the power supply voltage is equal to the voltage value of the pixel driving voltage, the voltage control module is in the through mode;
and under the condition that the voltage control module further comprises a boosting mode and the voltage value of the power supply voltage is smaller than the voltage value of the pixel driving voltage, the voltage control module is in the boosting mode.
4. The power supply circuit of claim 1, further comprising:
the logic control module is connected with the voltage control module;
the logic control module outputs a control signal, the voltage control module is in a voltage reduction mode under the action of the control signal, or the voltage control module is switched between the voltage reduction mode and other modes under the action of the control signal;
wherein the other mode is at least one of a boost mode and a buck mode.
5. The power supply circuit of claim 4, further comprising:
the voltage detection module is respectively connected with the input end of the voltage control module, the output end of the voltage control module and the logic control module;
the voltage detection module detects a voltage value of the power supply voltage and a voltage value of the pixel driving voltage, and feeds the voltage value of the power supply voltage and the voltage value of the pixel driving voltage back to the logic control module;
the logic control module outputs a control signal when the voltage value of the power supply voltage is greater than the voltage value of the pixel driving voltage, and controls the voltage control module to be in the voltage reduction mode;
in the case that the voltage control module further includes a through mode, the logic control module controls the voltage control module to be in the through mode by a control signal output by the logic control module in the case that the voltage value of the power supply voltage is equal to the voltage value of the pixel driving voltage;
and under the condition that the voltage control module further comprises a boosting mode, the logic control module controls the voltage control module to be in the boosting mode according to the control signal output by the logic control module under the condition that the voltage value of the power supply voltage is equal to the voltage value of the pixel driving voltage.
6. The power supply circuit of claim 5, wherein the logic control module is configured to adjust the duty cycle of the control signal according to a difference between the voltage value of the pixel driving voltage and a target value.
7. The power supply circuit according to any one of claims 1 to 6, wherein the voltage control module comprises: the energy storage device comprises a first control switch, a second control switch, a third control switch, a fourth control switch and an energy storage element; wherein the content of the first and second substances,
a first end of the first control switch is connected to the power supply voltage, a second end of the first control switch is connected to a first end of the second control switch through the energy storage element, a second end of the second control switch outputs the pixel driving voltage, a first end of the third control switch is connected to a second end of the first control switch, a first end of the fourth control switch is connected to a first end of the second control switch, and a second end of the third control switch and a second end of the fourth control switch are respectively connected to a first voltage end;
the control end of the first control switch is connected with a first control signal, the control end of the second control switch is connected with a second control signal, the control end of the third control switch is connected with a third control signal, and the control end of the fourth control switch is connected with a fourth control signal.
8. The power supply circuit of claim 7,
the second control switch is in a conducting state, the fourth control switch is in a closing state, and the voltage control module is in the voltage reduction mode under the condition that the first control switch and the third control switch are alternately in the conducting state;
the second control switch is in a conducting state, the third control switch is in a closing state, and the voltage control module is in a boosting mode under the condition that the first control switch and the fourth control switch are alternately in the conducting state;
and under the condition that the first control switch and the second control switch are both in a conducting state and the third control switch and the fourth control switch are both in a closing state, the voltage control module is in a through mode.
9. A display screen comprising a power supply circuit as claimed in any one of claims 1 to 8.
10. An electronic device characterized by comprising a display screen as claimed in claim 9.
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210922120.1A CN115242090A (en) | 2022-08-02 | 2022-08-02 | Power supply circuit, display screen and electronic equipment |
| PCT/CN2023/109585 WO2024027555A1 (en) | 2022-08-02 | 2023-07-27 | Power supply circuit, display screen, and electronic device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210922120.1A CN115242090A (en) | 2022-08-02 | 2022-08-02 | Power supply circuit, display screen and electronic equipment |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN115242090A true CN115242090A (en) | 2022-10-25 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202210922120.1A Pending CN115242090A (en) | 2022-08-02 | 2022-08-02 | Power supply circuit, display screen and electronic equipment |
Country Status (2)
| Country | Link |
|---|---|
| CN (1) | CN115242090A (en) |
| WO (1) | WO2024027555A1 (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115314033A (en) * | 2022-10-09 | 2022-11-08 | 深圳英集芯科技股份有限公司 | Quick charging driving circuit and related product |
| WO2024027555A1 (en) * | 2022-08-02 | 2024-02-08 | 维沃移动通信有限公司 | Power supply circuit, display screen, and electronic device |
| CN117691863A (en) * | 2024-02-01 | 2024-03-12 | 荣耀终端有限公司 | Power management system and electronic equipment |
Family Cites Families (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US7952900B2 (en) * | 2008-04-16 | 2011-05-31 | Analog Devices, Inc. | H-bridge buck-boost converter |
| KR20120056456A (en) * | 2010-11-25 | 2012-06-04 | 삼성모바일디스플레이주식회사 | DC-DC Converter |
| US9389628B2 (en) * | 2012-04-20 | 2016-07-12 | Intel Deutschland Gmbh | Digitally controlled buck-boost regulator having a custom mapping controller |
| US9000690B2 (en) * | 2012-06-13 | 2015-04-07 | Texas Instruments Incorporated | Driver for capacitive loads |
| CN111262435B (en) * | 2020-03-11 | 2023-06-23 | 昌芯(西安)集成电路科技有限责任公司 | Control circuit and control method of four-switch buck-boost converter |
| CN115242090A (en) * | 2022-08-02 | 2022-10-25 | 维沃移动通信有限公司 | Power supply circuit, display screen and electronic equipment |
-
2022
- 2022-08-02 CN CN202210922120.1A patent/CN115242090A/en active Pending
-
2023
- 2023-07-27 WO PCT/CN2023/109585 patent/WO2024027555A1/en unknown
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2024027555A1 (en) * | 2022-08-02 | 2024-02-08 | 维沃移动通信有限公司 | Power supply circuit, display screen, and electronic device |
| CN115314033A (en) * | 2022-10-09 | 2022-11-08 | 深圳英集芯科技股份有限公司 | Quick charging driving circuit and related product |
| CN115314033B (en) * | 2022-10-09 | 2023-03-07 | 深圳英集芯科技股份有限公司 | Quick charging driving circuit and related product |
| CN117691863A (en) * | 2024-02-01 | 2024-03-12 | 荣耀终端有限公司 | Power management system and electronic equipment |
Also Published As
| Publication number | Publication date |
|---|---|
| WO2024027555A1 (en) | 2024-02-08 |
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