CN113036900A - Display screen power supply circuit and electronic equipment - Google Patents
Display screen power supply circuit and electronic equipment Download PDFInfo
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- CN113036900A CN113036900A CN202110283158.4A CN202110283158A CN113036900A CN 113036900 A CN113036900 A CN 113036900A CN 202110283158 A CN202110283158 A CN 202110283158A CN 113036900 A CN113036900 A CN 113036900A
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- 238000004146 energy storage Methods 0.000 claims abstract description 50
- 238000001514 detection method Methods 0.000 claims description 38
- 239000003990 capacitor Substances 0.000 claims description 18
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 abstract description 7
- 230000005669 field effect Effects 0.000 description 18
- 238000010586 diagram Methods 0.000 description 14
- 238000000034 method Methods 0.000 description 11
- 230000008569 process Effects 0.000 description 6
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- 230000008859 change Effects 0.000 description 4
- 239000008186 active pharmaceutical agent Substances 0.000 description 3
- 238000004891 communication Methods 0.000 description 2
- 238000007599 discharging Methods 0.000 description 2
- 230000004044 response Effects 0.000 description 2
- 239000004065 semiconductor Substances 0.000 description 2
- 230000004913 activation Effects 0.000 description 1
- 238000004364 calculation method Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 230000005611 electricity Effects 0.000 description 1
- 239000004973 liquid crystal related substance Substances 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 229910044991 metal oxide Inorganic materials 0.000 description 1
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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
- H02J9/00—Circuit arrangements for emergency or stand-by power supply, e.g. for emergency lighting
- H02J9/04—Circuit arrangements for emergency or stand-by power supply, e.g. for emergency lighting in which the distribution system is disconnected from the normal source and connected to a standby source
- H02J9/06—Circuit arrangements for emergency or stand-by power supply, e.g. for emergency lighting in which the distribution system is disconnected from the normal source and connected to a standby source with automatic change-over, e.g. UPS systems
- H02J9/068—Electronic means for switching from one power supply to another power supply, e.g. to avoid parallel connection
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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]
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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
- H02J9/00—Circuit arrangements for emergency or stand-by power supply, e.g. for emergency lighting
- H02J9/04—Circuit arrangements for emergency or stand-by power supply, e.g. for emergency lighting in which the distribution system is disconnected from the normal source and connected to a standby source
- H02J9/06—Circuit arrangements for emergency or stand-by power supply, e.g. for emergency lighting in which the distribution system is disconnected from the normal source and connected to a standby source with automatic change-over, e.g. UPS systems
- H02J9/061—Circuit arrangements for emergency or stand-by power supply, e.g. for emergency lighting in which the distribution system is disconnected from the normal source and connected to a standby source with automatic change-over, e.g. UPS systems for DC powered loads
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- Business, Economics & Management (AREA)
- Emergency Management (AREA)
- Power Engineering (AREA)
- Physics & Mathematics (AREA)
- Computer Hardware Design (AREA)
- General Physics & Mathematics (AREA)
- Theoretical Computer Science (AREA)
- Electroluminescent Light Sources (AREA)
- Control Of Indicators Other Than Cathode Ray Tubes (AREA)
Abstract
The application discloses display screen power supply circuit and electronic equipment belongs to electron technical field. The circuit comprises a control module, a switching module, a power module and an energy storage module, wherein the control module controls the switching module to disconnect the power module from the display screen under the condition that the state of the power module accords with a preset state, and the energy storage module connected with the display screen in parallel supplies power to the display screen. The control module resets the disconnected power module, controls the switching module to connect the power module and the display screen after the power module is reset, supplies power to the display screen through the reset power module, and charges the energy storage module. When the state of the power supply module is determined to accord with the preset state and large ripple voltage possibly appears in the voltage output by the power supply module, the power supply module is reset, so that the large ripple voltage appearing in the output voltage of the power supply module can be avoided, and the phenomenon of screen flash or water ripple of an OLED display screen can be avoided.
Description
Technical Field
The application belongs to the technical field of electronics, concretely relates to display screen power supply circuit and electronic equipment.
Background
The organic light-Emitting semiconductor (OLED) can emit light without a backlight, and compared with other types of display screens, the OLED display screen has the advantages of remarkable energy-saving effect, small thickness and simple manufacturing process.
Under general conditions, the OLED display screen among the electronic equipment adopts independent power module to supply power, and power module operation when some states, great ripple can appear in the supply voltage of output, makes the supply voltage who exports for the OLED display screen unstable, can lead to the OLED display screen to appear the screen and dodge or the ripple phenomenon, influences the normal use of OLED display screen.
Disclosure of Invention
The embodiment of the application aims to provide a display screen power supply circuit and electronic equipment, and the problem that the supply voltage of an OLED display screen is unstable can be solved.
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 display screen power supply circuit, including: the device comprises a control module, a switching module, a power supply module and an energy storage module;
the control module is respectively connected with the switching module and the power supply module and is used for sending a first switching signal to the switching module under the condition that the state of the power supply module is confirmed to be in accordance with a preset state;
one end of the switching module is connected with the power supply module, the other end of the switching module is connected with the energy storage module and the display screen, the energy storage module is connected with the display screen in parallel, and the switching module is used for disconnecting the power supply module from the display screen under the condition of receiving the first switching signal so as to supply power to the display screen through the energy storage module connected with the display screen in parallel;
the control module is also used for resetting the disconnected power supply module and sending a second switching signal to the switching module after the power supply module is reset;
the switching module is further used for connecting the power module and the display screen under the condition of receiving the second switching signal, so that the power module supplies power to the display screen after resetting, and the energy storage module connected with the display screen in parallel is charged.
In a second aspect, an embodiment of the present application provides an electronic device, including the display screen power supply circuit described in the first aspect.
In the embodiment of the application, the display screen power supply circuit comprises a control module, a switching module, a power module and an energy storage module, the control module sends a first switching signal to the switching module when the state of the power module meets the preset state, the switching module disconnects the power module from the display screen when receiving the first switching signal, and the energy storage module connected with the display screen in parallel supplies power to the display screen. The control module resets the disconnected power module, sends a second switching signal to the switching module after the power module resets, and the switching module connects the power module and the display screen under the condition of receiving the second switching signal, supplies power to the display screen through the reset power module, and charges the energy storage module connected with the display screen in parallel. When the state of the power supply module is determined to accord with the preset state and large ripple voltage possibly appears in the voltage output by the power supply module, the power supply module is reset, so that the large ripple voltage appearing in the output voltage of the power supply module can be avoided, and the phenomenon of screen flash or water ripple of an OLED display screen can be avoided.
Drawings
Fig. 1 is a schematic partial structure diagram of an OLED display panel provided in an embodiment of the present application;
fig. 2 is a voltage impedance graph of a field effect transistor according to an embodiment of the present disclosure;
fig. 3 is a schematic structural diagram of a display screen power supply circuit according to an embodiment of the present disclosure;
FIG. 4 is a schematic structural diagram of another display panel power supply circuit provided in an embodiment of the present application;
FIG. 5 is a schematic structural diagram of a power supply circuit for a display panel according to an embodiment of the present disclosure;
FIG. 6 is a schematic structural diagram of a power supply circuit for a display screen according to an embodiment of the present disclosure;
fig. 7 is a block diagram of an electronic device according to an embodiment of the present disclosure;
fig. 8 is a schematic diagram of a hardware structure 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.
Referring to fig. 1, fig. 1 is a schematic partial structure diagram of an OLED display screen according to an embodiment of the present disclosure, the OLED display screen is composed of a plurality of OLED diodes 101 arranged according to a preset rule, the OLED diodes are controlled by a row address line 102 and a column address line 103 in the display screen, a first field effect transistor 104, a capacitor 105, and a second field effect transistor 106 are disposed between the row address line and the column address line to control on and off of the OLED diodes 101, and the first field effect transistor and the second field effect transistor may be P-type Metal oxide semiconductor field effect transistors (PMOS). The grid electrode of the first field effect tube is connected with the row address wire, the drain electrode of the first field effect tube is connected with the column address wire, and the source electrode of the first field effect tube is connected with the grid electrode of the second field effect tube. The drain electrode of the second field effect transistor is connected with the anode of the OLED diode, and the source electrode of the second field effect transistor is connected with the anode of the power supply voltage. One end of the capacitor is connected with the grid electrode of the second field effect transistor, and the other end of the capacitor is connected with the positive electrode of the power supply voltage. The cathode of the OLED diode is connected with the negative pole of the power supply voltage, when the second field effect tube is conducted under the control of the row address line and the column address line, the anode of the OLED diode is connected with the positive pole of the power supply voltage, and the OLED diode is conducted to emit light. As shown in fig. 1, when the OLED diode is turned on,voltage V across the OLED diodeLED＝ELVDD-ELVSS-VDS，ELVDDPositive voltage as supply voltage, ELVSSNegative pole voltage, V, as supply voltageDSThe voltage drop when the second field effect transistor is conducted is shown.
Referring to fig. 2, fig. 2 is a graph of voltage impedance of a field effect transistor according to an embodiment of the present application, wherein the abscissa represents voltage in volts, and represents the voltage V between the gate and the source of the PMOS transistorGSAnd the ordinate is the impedance of the PMOS tube when the PMOS tube is conducted, and the unit is milliohm. The first curve 201 is the voltage impedance curve of the PMOS transistor at 25 degrees c, and the second curve 202 is the voltage impedance curve of the PMOS transistor at 125 degrees c. As shown in FIG. 2, the impedance and voltage V of the PMOS transistorGSIn correlation, the impedance of the PMOS tube varies with the voltage V between 0V and 3VGSThe slope of the change is large, that is, between a voltage of 0V and a voltage of 3V, VGSThe slight fluctuation of the voltage will cause the impedance of the PMOS tube to change greatly. Combining the above formula, when the impedance of the PMOS tube changes greatly, the voltage drop V of the second field effect tubeDSThe voltage V across the corresponding OLED diode varies greatlyLEDAnd significantly changed. Voltage VLEDWhen the change is large, the current flowing through the OLED diode changes greatly, and at the moment, the screen flash or water ripple phenomenon can occur to the OLED display screen, so that the normal use of the OLED display screen is influenced.
In order to solve the above problem, the present embodiment provides a display screen power supply circuit and an electronic device. The following describes the display screen power supply circuit provided in the embodiments of the present application in detail through specific embodiments and application scenarios thereof with reference to the accompanying drawings.
Referring to fig. 3, fig. 3 is a schematic structural diagram of a display panel power supply circuit according to an embodiment of the present application, and as shown in fig. 3, the display panel power supply circuit may include: the device comprises a control module, a switching module, a power supply module and an energy storage module.
The control module is respectively connected with the switching module and the power module and used for sending a first switching signal to the switching module under the condition that the state of the power module is confirmed to accord with the preset state. One end of the switching module is connected with the power supply module, the other end of the switching module is connected with the energy storage module and the display screen, and the energy storage module and the display screen are connected in parallel; the switching module is used for disconnecting the power module from the display screen under the condition of receiving the first switching signal so as to supply power to the display screen through the energy storage module connected with the display screen in parallel.
In this embodiment, the control module is configured to monitor the state of the power module to determine whether the state of the power module conforms to a preset state, and send a first switching signal to the switching module when the state of the power module conforms to the preset state, so as to control the switching module to disconnect the connection between the power module and the display screen, and disconnect the connection between the power module and the energy storage module. When the state of the power supply module accords with the preset state, the power supply voltage output by the power supply module has larger ripple voltage, so that the phenomenon of screen flash or water ripple of the display screen can be caused. For example, the power module may adopt a direct-current to direct-current boost (boost) chopper circuit, and specifically may adopt a boost power chip as the power module, and when the working mode of the boost power chip is switched from a Pulse Width Modulation (PWM) mode to a diode mode, the boost power chip is in a preset state, and a large ripple voltage may occur in the supply voltage output by the boost power chip at this time, resulting in a screen flash or a water ripple phenomenon occurring on the display screen. The power supply module can also adopt power supply circuits of other types, when the power supply module adopts the power supply circuits of other types, the preset state can be specifically set according to the type of the power supply circuit, and the preset state corresponds to the state of large ripple voltage in the power supply voltage.
Optionally, the display screen power supply circuit may further include a detection module, and the control module may detect the state of the power supply module through the detection module to determine the state of the power supply module.
The detection module is connected with the control module and connected with a voltage output line between the power supply module and the display screen. The control module is specifically used for receiving the ripple voltage sent by the detection module and determining that the state of the power supply module accords with a preset state under the condition that the ripple voltage is greater than or equal to a preset threshold value; the ripple voltage is the ripple voltage in the power supply voltage detected by the detection module in the voltage output circuit, and the power supply voltage is the voltage output by the power supply module to the display screen;
or the control module is specifically configured to receive the notification signal sent by the detection module, and determine that the state of the power supply module conforms to a preset state according to the notification signal; the notification signal is sent by the detection module when the ripple voltage is greater than or equal to a preset threshold.
For example, as shown in fig. 4, fig. 4 is a schematic structural diagram of another display panel power supply circuit provided in the embodiment of the present application, the control module may be a Central Processing Unit (CPU) in the electronic device, the switching module may be a switch, the detecting module may be an Analog-to-Digital Converter (ADC), and the energy storage module may be a capacitor connected in parallel with the display panel. The positive pole of the power supply voltage output by the power supply module is connected with one input end of the change-over switch, and the negative pole of the power supply voltage output by the power supply module is connected with the other input end of the change-over switch; one output end of the change-over switch corresponds to the input end connected with the positive pole of the power supply voltage and is connected with the positive pole of the display screen and the positive pole of the energy storage module, the other output end of the change-over switch corresponds to the input end connected with the negative pole of the power supply voltage and is connected with the negative pole of the display screen and the negative pole of the energy storage module, the positive pole of the display screen is the source electrode of the second field effect transistor shown in figure 1, and the negative pole of the display screen is the cathode of the OLED diode shown in figure 1.
As shown in fig. 4, when the switch is turned off, the output terminal of the power module, the switch and the voltage input terminal of the display screen form a voltage output line, and the voltage input terminal of the display screen includes the positive electrode and the negative electrode of the display screen. At the moment, the positive pole of the power supply voltage is connected with the positive pole of the display screen and the positive pole of the capacitor, the negative pole of the power supply voltage is connected with the negative pole of the display screen and the negative pole of the capacitor, and the power supply voltage output by the power supply module supplies power for the display screen and charges for the energy storage module. Conversely, when the change-over switch is turned off, the positive electrode of the power supply voltage is disconnected from the positive electrode of the display screen and from the positive electrode of the capacitor; the negative pole of the power supply voltage is disconnected with the negative pole of the display screen and the negative pole of the capacitor, the display screen and the capacitor form a current loop at the moment, and the capacitor can supply power for the display screen.
In one embodiment, the detection module is connected to a voltage input terminal of the display screen to detect a ripple voltage in the supply voltage at the voltage input terminal of the display screen. As shown in fig. 4, the analog-to-digital converter is disposed between the switch and the display screen, such that the positive input terminal of the analog-to-digital converter is connected to the positive electrode of the display screen, and the negative input terminal of the analog-to-digital converter is connected to the negative electrode of the display screen. The positive pole of the display screen is connected with the positive pole of the power supply voltage, and the negative pole is connected with the negative pole of the power supply voltage, so that the detection module can detect the power supply voltage of the voltage input end of the display screen to obtain the positive pole voltage and the negative pole voltage of the power supply voltage, and the ripple voltage in the power supply voltage is calculated according to the positive pole voltage and the negative pole voltage of the power supply voltage. The specific calculation method of the ripple voltage may be set according to the requirement, and this embodiment will not be described herein.
In this embodiment, the detection module is connected to the voltage input terminal of the display screen, and can directly detect the ripple voltage in the supply voltage at the voltage input terminal of the display screen. When the switching module disconnects the connection between the display screen and the power module, because the voltage of the capacitor cannot suddenly change, the voltage output by the energy storage module detected by the detection module is stable, large ripple voltage cannot appear, the repeated signal transmission to the control module can be avoided, the control module can be prevented from resetting the power module repeatedly, and the power consumption of the control module can be reduced. It should be noted that the detection module may also be disposed between the power supply module and the switch, and the ripple voltage in the power supply voltage is detected at the output end of the power supply module.
In an embodiment, the analog-to-digital converter may directly send the ripple voltage to the CPU after the detected ripple voltage, and the CPU may receive the ripple voltage, and determine that the ripple voltage in the power supply voltage is larger when the ripple voltage is determined to be greater than or equal to the preset threshold, and further may confirm that the state of the power supply module conforms to the preset state. The preset threshold is, for example, 80 millivolts, and the specific size of the preset threshold may be set according to the requirement, which is not limited by the embodiment.
In another embodiment, the analog-to-digital converter may first determine whether the ripple voltage is greater than or equal to a preset threshold when detecting the ripple voltage, and in case of determining that the ripple voltage is greater than or equal to the preset threshold, the analog-to-digital converter may send a notification signal, such as an interrupt signal, to the CPU. Correspondingly, after receiving the interrupt signal sent by the analog-to-digital converter, the CPU can determine that the state of the power module conforms to the preset state according to the interrupt signal, and at this time, the CPU can send a disconnection signal, i.e., a first switching signal, to the switch. The specific form of the notification signal may be set according to the requirement, and this embodiment does not specifically limit this.
In this embodiment, the switch is disconnected after receiving the disconnection signal, so as to disconnect the power module from the display screen and disconnect the power module from the energy storage module. As shown in fig. 4, when the switch is closed, one end of the switch is connected to the power module, and the other end of the switch is connected to the energy storage module and the display screen which are connected in parallel. On the contrary, after the change-over switch is disconnected, the connection between the power module and the display screen is disconnected, the energy storage module and the display screen form a current loop, and the energy storage module is used as a zero-hour power supply to supply power for the display screen.
In practical application, whether there is great ripple voltage in the supply voltage of direct detection power module output, through the detection to ripple voltage, can accurately confirm ripple voltage whether can lead to the display screen to appear the screen flashing or the ripple phenomenon to can accurately confirm power module's state, further can avoid when unable accurate definite power module's state, power module is by frequent reset.
In one embodiment, the energy storage module may be an energy storage capacitor. Alternatively, the energy storage module may be an energy storage circuit composed of electronic components such as a capacitor, an inductor, and a resistor. When the energy storage module is an energy storage capacitor, the energy storage module is simple in structure, and the structure of the power supply circuit can be simplified. The specific form of the energy storage module can be set according to the requirement, and this embodiment does not limit this.
In practical application, the specific types of the control module, the switching module and the power module may be set according to requirements, and the specific type of the first switching signal may be set according to the type of the switching module, which is not limited in this embodiment.
The control module is further used for resetting the disconnected power supply module and sending a second switching signal to the switching module after the power supply module is reset. The switching module is also used for connecting the power supply module and the display screen under the condition of receiving the second switching signal, supplying power to the display screen through the reset power supply module and charging the energy storage module connected with the display screen in parallel.
In this embodiment, after the control module disconnects the power module from the display screen, the control module may reset the power module to restore the power module to the initial state. In combination with the above example, the CPU may be communicatively connected to the power supply module, and after the CPU sends the off signal to the switch, the CPU may send a reset signal to the power supply module. Accordingly, the power module can be restarted after receiving the reset signal, so that the power module is restored to the initial state. When the power supply module is in an initial state, ripple voltage in the power supply voltage output by the power supply module is smaller than a preset threshold value, and screen flashing and water ripple phenomena of the display screen cannot be caused. For example, when the power module is a boost power chip, restarting the boost power chip can restore the boost power chip from a diode mode to a PWM mode in an initial state, and when the boost power chip operates in the PWM mode, ripple voltage in output power supply voltage is small. Further, after the power module is restarted, the power module may send a reset completion signal to the CPU, and after the CPU receives the reset completion signal, the CPU determines that the power module is reset, and may send a second switching signal to the switch, where the second switching signal may be a close signal. Correspondingly, the change-over switch is closed after receiving the closing signal so as to reconnect the power supply module and the display screen, connect the power supply module and the energy storage module, supply power to the display screen through the reset power supply module and supply power to the energy storage module.
In another embodiment, the control port of the control module may be connected to the control terminal of the power module, and after the control module sends the first switching signal to the switching module, the control module may send the control signal to the power module through the control port to directly control the power module to restart. The specific process of resetting the power module by the control module can be set according to requirements, and this embodiment does not limit this.
It should be noted that the discharge time of the energy storage module is longer than the reset time of the power supply module, so as to avoid that the energy storage module finishes discharging and cannot supply power to the display screen under the condition that the reset of the power supply module is not completed. By combining the above example, the capacity of the capacitor can be set according to the reset time of the power supply module and the electricity consumption of the display screen, and when the capacitor is fully charged and supplies power to the display screen, the capacitor can continuously supply power to the display screen until the power supply module is reset.
Optionally, the control module is specifically configured to send a second switching signal to the switching module at an interval of a first preset duration after the power module is reset.
In one embodiment, the control module may wait for a first preset time period to send a second switching signal to the switching module after the power module is reset, so that the switching module may connect the power module and the display screen to supply power to the display screen after waiting for the first preset time period after the power module is reset. At the moment, the power supply voltage output by the power supply module is stable, and the stable power supply voltage can be provided for the display screen. The specific value of the first preset duration may be set according to a requirement, which is not limited in this embodiment.
In practical application, after the power module is reset, the power module waits for a first preset time period and supplies power to the display screen, so that the power module can be prevented from supplying power to the display screen under the condition that the voltage state is unstable after the power module is reset. The first preset time is less than the discharge time of the energy storage module.
Optionally, the switching module is specifically configured to connect the power module and the display screen at a second preset time interval when the second switching signal is received.
In an embodiment, after receiving the second switching signal, the switching module may connect the power module and the display screen after waiting for a second preset time period, so that the power module supplies power to the display screen after outputting the stable power supply voltage. The specific value of the second preset time period may be set according to the requirement, which is not limited in this embodiment. In practical application, after the power module is reset, the power module waits for a second preset time period and supplies power to the display screen, so that the power module can be prevented from supplying power to the display screen under the condition that the voltage state is unstable after the power module is reset. And the second preset time is less than the discharge time of the energy storage module.
In summary, in this embodiment, the display screen power supply circuit includes the control module, the switching module, the power module and the energy storage module, the control module sends the first switching signal to the switching module when the state of the power module conforms to the preset state, and the switching module disconnects the power module from the display screen when receiving the first switching signal, so as to supply power to the display screen through the energy storage module connected in parallel with the display screen. The control module resets the disconnected power module, sends a second switching signal to the switching module after the power module resets, and the switching module connects the power module and the display screen under the condition of receiving the second switching signal, supplies power to the display screen through the reset power module, and charges the energy storage module connected with the display screen in parallel. When the state of the power supply module is determined to accord with the preset state and large ripple voltage possibly appears in the voltage output by the power supply module, the power supply module is reset, so that the large ripple voltage appearing in the output voltage of the power supply module can be avoided, and the phenomenon of screen flash or water ripple of an OLED display screen can be avoided.
Optionally, the control module is specifically configured to obtain operation mode information of the power module, and send the first switching signal to the switching module when it is determined that the state of the power module meets the preset state according to the operation mode information.
In an embodiment, the control module may obtain operation mode information of the power module, determine an operation mode of the power module according to the operation mode information, and further determine a state of the power module according to the operation mode. As shown in fig. 5, fig. 5 is a schematic structural diagram of another display power supply Circuit provided in this embodiment of the application, and the CPU may be connected to the power supply module through a communication bus, for example, an I2C (Integrated Circuit) bus. In combination with the above example, when the operation mode of the boost power chip is the diode mode during the operation of the boost power chip, a large ripple voltage may occur in the supply voltage output by the boost power chip. The CPU may send an acquisition request to the boost power chip through the I2C bus, and the boost power chip may send operation mode information of the boost power chip to the CPU in response to the acquisition request after receiving the acquisition request. After receiving the operation mode information sent by the boost power supply chip, if the operation mode of the boost power supply chip is determined to be the diode mode according to the operation mode information, the CPU can directly determine that the state of the boost power supply chip accords with the preset state. At this time, the CPU may first send an off signal to the switch, and then send a reset signal to the boost power chip through the I2C bus, and after receiving the reset signal, the boost power chip may restart the start in response to the reset signal, thereby completing the reset of the boost power chip. The specific process of the control module for acquiring the operation mode information may be set according to the requirement, and this embodiment does not limit this.
In practical application, the control module directly determines the state of the power supply module according to the operation mode information of the power supply module, so that a detection module is not arranged in the power supply circuit, and the structure of the power supply circuit is simplified. Meanwhile, under the condition that the power supply module is determined to enter some working modes according to the operation mode information, the power supply module is directly switched and restarted, and the power supply module can be reset in advance before large ripple voltage appears, so that the large ripple voltage is avoided.
Optionally, the control module is further configured to prohibit disconnection of the power module from the display screen when the number of times of resetting of the power module is greater than or equal to a preset number of times, so as to continuously supply power to the display screen through the power module.
In one embodiment, the control module may record the number of resets that the power module is reset after each activation of the display screen. In combination with the above example, when a large ripple voltage occurs in the power supply voltage output by the power supply module, the power supply module is reset and restarted, the power supply module is reset once, and the reset frequency recorded by the control module is increased once. When the reset times are larger than or equal to the preset times, if the control module determines that the state of the power supply module accords with the preset state, the control module does not send a first switching signal to the switching module, forbids to disconnect the power supply module from the display screen, forbids to reset the power supply module, and continuously supplies power to the display screen through the power supply module. The reset times of the power module can be automatically cleared after the display screen is turned off every time, the specific numerical value of the preset times can be set according to requirements, and the embodiment does not limit the reset times.
In practical application, the control module records the times of resetting the power supply module, and after the power supply module is reset for multiple times, the power supply module can be prohibited from resetting so as to avoid frequently restarting the power supply module.
Optionally, the display screen power supply circuit may further include a detection switch, and the detection module is connected to the control module through the detection switch; the control module is also used for controlling the detection switch to be switched off under the condition that the state of the power supply module is confirmed to accord with the preset state, and controlling the detection switch to be switched on after the power supply module is reset.
Exemplarily, as shown in fig. 6, fig. 6 is a schematic structural diagram of a power supply circuit for a display screen according to another embodiment of the present application, where a detection switch is disposed between an analog-to-digital converter and a CPU, and one end of the detection switch is connected to the CPU and the other end is connected to the analog-to-digital converter. When the detection switch is turned off, the connection between the CPU and the analog-to-digital converter is disconnected, and when the detection switch is turned on, the connection between the CPU and the analog-to-digital converter is disconnected. The control module controls the detection switch to be switched off under the condition that the state of the power supply module accords with the preset state, and can prevent the analog-to-digital converter from sending ripple voltage or notification signals to the control module under the condition that the state of the power supply module accords with the preset state, so that the control module can be prevented from repeatedly sending signals to the control module, the control module can be prevented from repeatedly resetting the power supply module, and the power consumption of the control module can be reduced. Conversely, after the power module is reset, the detection switch is controlled to be turned on, so that the analog-to-digital converter can continuously send the ripple voltage or the notification signal to the control module.
Fig. 7 is a block diagram of an electronic device provided in an embodiment of the present application, where the electronic device includes a processor 701, a memory 702, and a program or instructions stored in the memory 702 and executable on the processor 701, and the electronic device includes the display screen power supply circuit as described above.
Fig. 8 is a schematic diagram of a hardware structure of an electronic device according to an embodiment of the present application.
The electronic device 800 includes, but is not limited to: a radio frequency unit 801, a network module 802, an audio output unit 803, an input unit 804, a sensor 805, a display unit 806, a user input unit 807, an interface unit 808, a memory 809, and a processor 810. The electronic device further comprises a display screen power supply circuit as described above for supplying power to the display unit 806.
Those skilled in the art will appreciate that the electronic device 800 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 810 via a power management system, so as to manage charging, discharging, and power consumption management functions via the power management system. The electronic device structure shown in fig. 8 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 omitted here.
It should be understood that in the embodiment of the present application, the input Unit 804 may include a Graphics Processing Unit (GPU) 8041 and a microphone 8042, and the Graphics Processing Unit 8041 processes image data of a still picture or a video obtained by an image capturing device (such as a camera) in a video capturing mode or an image capturing mode. The display unit 806 may include a display panel 8061, and the display panel 8061 may be configured in the form of a liquid crystal display, an organic light emitting diode, or the like. The user input unit 807 includes a touch panel 8071 and other input devices 8072. A touch panel 8071, also referred to as a touch screen. The touch panel 8071 may include two portions of a touch detection device and a touch controller. Other input devices 8072 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 809 may be used to store software programs as well as various data including, but not limited to, application programs and operating systems. The processor 810 may integrate an application processor, which mainly handles operating systems, user interfaces, application programs, etc., and a modem processor, which mainly handles wireless communications. It will be appreciated that the modem processor described above may not be integrated into processor 810.
Wherein, the processor is the processor in the audio output unit 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.
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.
Claims (10)
1. A display screen power supply circuit, comprising: the device comprises a control module, a switching module, a power supply module and an energy storage module;
the control module is respectively connected with the switching module and the power supply module and is used for sending a first switching signal to the switching module under the condition that the state of the power supply module is confirmed to be in accordance with a preset state;
one end of the switching module is connected with the power supply module, the other end of the switching module is connected with the energy storage module and the display screen, and the energy storage module and the display screen are connected in parallel; the switching module is used for disconnecting the power supply module from the display screen under the condition of receiving the first switching signal so as to supply power to the display screen through the energy storage module connected with the display screen in parallel;
the control module is also used for resetting the disconnected power supply module and sending a second switching signal to the switching module after the power supply module is reset;
the switching module is further used for connecting the power module and the display screen under the condition of receiving the second switching signal, so that the power module supplies power to the display screen after resetting, and the energy storage module connected with the display screen in parallel is charged.
2. The display screen power supply circuit of claim 1, further comprising a detection module connected to the control module and to a voltage output line between the power module and the display screen;
the control module is specifically configured to receive the ripple voltage sent by the detection module, and determine that the state of the power supply module conforms to a preset state when the ripple voltage is greater than or equal to a preset threshold; the ripple voltage is a ripple voltage in a power supply voltage detected by the detection module in the voltage output line, and the power supply voltage is a voltage output by the power supply module to the display screen;
or, the control module is specifically configured to receive a notification signal sent by the detection module, and determine that the state of the power module conforms to the preset state according to the notification signal; the notification signal is sent by the detection module when the ripple voltage is greater than or equal to a preset threshold.
3. The display screen power supply circuit of claim 2, wherein the detection module is connected to a voltage input of the display screen to detect a ripple voltage in the supply voltage at the voltage input of the display screen.
4. The display screen power supply circuit according to claim 2, further comprising a detection switch, wherein the detection module is connected with the control module through the detection switch;
the control module is further used for controlling the detection switch to be switched off under the condition that the state of the power supply module is confirmed to be in accordance with the preset state, and controlling the detection switch to be switched on after the power supply module is reset.
5. The display screen power supply circuit of claim 1,
the control module is specifically configured to acquire operation mode information of the power supply module, and send the first switching signal to the switching module when it is determined that the state of the power supply module conforms to a preset state according to the operation mode information.
6. The display screen power supply circuit of claim 1,
the control module is further used for forbidding to disconnect the power module from the display screen under the condition that the reset times of the power module are larger than or equal to the preset times, so that the power module can continuously supply power to the display screen.
7. The display screen power supply circuit according to claim 1, wherein the control module is specifically configured to send the second switching signal to the switching module at an interval of a first preset duration after the power supply module is reset.
8. The display screen power supply circuit according to claim 1, wherein the switching module is specifically configured to connect the power supply module and the display screen at an interval of a second preset duration when the second switching signal is received.
9. The display screen power supply circuit of any one of claims 1-8, wherein the energy storage module comprises an energy storage capacitor.
10. An electronic device, characterized in that it comprises a display screen power supply circuit according to any one of claims 1-9.
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| CN113036900B (en) | 2024-09-13 |
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