CN111899681B - Power supply circuit and method for display screen in terminal - Google Patents

Abstract

The embodiment of the application discloses a power supply circuit and a method for a display screen in a terminal, wherein the power supply circuit comprises: the power management module is used for responding to the enabling signal sent by the application processor in the terminal and providing input voltage for the display screen through the power output port of the power management module; the power supply conversion module is used for converting the voltage of the power supply in the terminal into the input voltage of the display screen; and the switch module is used for controlling the power supply conversion module to provide the input voltage for the display screen under the condition that the output voltage of the electric energy output port is determined to not meet the condition based on the input voltage of the display screen.

Description

Power supply circuit and method for display screen in terminal

Technical field

The embodiments of the present application relate to electronic technology, and relate to but are not limited to a power supply circuit and method for a display screen in a terminal.

Background technique

Currently, with the rapid development of electronic communication technology, portable terminal products such as smartphones and tablet computers have penetrated into every aspect of people's daily lives and become indispensable products in work, study and life. Among them, the display screens of terminal products have also transitioned from traditional non-touch displays to touch displays. At the same time, the size of the display screens has also become larger and larger with the development of terminal technology. The importance of display screens in the development process of terminals The degree is getting higher and higher.

However, when users are using terminal products, sometimes the display screen suddenly turns yellow, which gives the user a very unfriendly experience. The user will feel that they have purchased a problematic product. Therefore, how to solve the problem of display screen The problem of sudden yellowing has become a research hotspot among those skilled in the art.

Contents of the invention

In view of this, embodiments of the present application provide a power supply circuit and method for a display screen in a terminal.

The technical solution of the embodiment of this application is implemented as follows:

In a first aspect, embodiments of the present application provide a power supply circuit for a display screen in a terminal. The circuit includes:

A power management module, configured to respond to the enable signal sent by the application processor in the terminal and provide input voltage to the display screen through its own power output port;

A power conversion module, used to convert the voltage of the power supply in the terminal into the input voltage of the display screen;

A switch module, configured to control the power conversion module to provide the input voltage to the display screen when it is determined based on the input voltage of the display screen that the output voltage of the power output port does not meet the condition.

In a second aspect, embodiments of the present application further provide a power supply circuit for a display screen in a terminal. The circuit includes:

The main power management module is used to respond to the enable signal sent by the application processor in the terminal and provide input voltage to the display screen through its own power output port;

A power management module configured to provide the input voltage to the display screen in response to the turning on of the power key in the terminal;

Wherein, the main power management module and the slave power management module are connected in parallel.

In a third aspect, embodiments of the present application provide a power supply method for a display screen in a terminal. The method includes:

The power management module of the terminal responds to the enable signal sent by the application processor in the terminal and provides input voltage to the display screen through its own power output port;

The power conversion module of the terminal converts the voltage of the power supply in the terminal into the input voltage of the display screen;

When the switch module of the terminal determines that the output voltage of the power output port does not meet the condition based on the input voltage of the display screen, it controls the power conversion module to provide the input voltage to the display screen.

In a fourth aspect, embodiments of the present application further provide a power supply method for a display screen in a terminal. The method includes:

The main power management module of the terminal responds to the enable signal sent by the application processor in the terminal and provides input voltage to the display screen through its own power output port;

The slave power management module of the terminal provides the input voltage to the display screen in response to the turning on of the power key in the terminal;

Wherein, the main power management module and the slave power management module are connected in parallel.

Embodiments of the present application provide a power supply circuit and method for a display screen in a terminal. The circuit includes: a power management module, configured to respond to an enable signal sent by an application processor in the terminal and provide power to all terminals through its own power output port. The display screen provides an input voltage; a power conversion module is used to convert the voltage of the power supply in the terminal to an input voltage of the display screen; a switch module is used to determine the power output port based on the input voltage of the display screen When the output voltage does not meet the conditions, the power conversion module is controlled to provide the input voltage to the display screen. This can effectively prevent the display screen from turning yellow instantly when the system starts abnormally.

Description of the drawings

Figure 1 is a structural schematic diagram 1 of the power supply circuit according to the embodiment of the present application;

Figure 2 is the second structural principle diagram of the power supply circuit according to the embodiment of the present application;

Figure 3 is a schematic diagram 1 of the implementation flow of the power supply method according to the embodiment of the present application;

Figure 4 is a schematic diagram 2 of the implementation flow of the power supply method according to the embodiment of the present application;

Figure 5A is a functional block diagram of a power supply system for a display screen in related art;

Figure 5B is the third structural principle diagram of the power supply circuit according to the embodiment of the present application;

Figure 5C is a schematic flow chart 3 of the implementation of the power supply method according to the embodiment of the present application;

Figure 6 is the structural principle diagram 4 of the power supply circuit according to the embodiment of the present application;

Figure 7 is a schematic diagram 5 of the structure of the power supply circuit according to the embodiment of the present application.

Detailed ways

The technical solution of the present application will be further described in detail below with reference to the accompanying drawings and examples. Obviously, the described embodiments are only some of the embodiments of the present application, but not all of the embodiments. Based on the embodiments of this application, all other embodiments obtained by those of ordinary skill in the art without any creative work shall fall within the scope of protection of this application.

In the following description, reference is made to "some embodiments" which describe a subset of all possible embodiments, but it is understood that "some embodiments" may be the same subset or a different subset of all possible embodiments, and Can be combined with each other without conflict.

In the following description, suffixes such as "module", "component" or "unit" used to represent elements are only used to facilitate the description of the present application and have no specific meaning in themselves. Therefore, "module", "component" or "unit" may be used interchangeably.

It should be pointed out that the terms "first\second\third" involved in the embodiments of this application are only used to distinguish similar objects and do not represent a specific ordering of objects. It is understandable that "first\second\third" "The specific order or sequence may be interchanged where permitted so that the embodiments of the application described herein can be practiced in an order other than that illustrated or described herein.

An embodiment of the present application provides a power supply circuit for a display screen in a terminal. Figure 1 is a schematic structural diagram of the power supply circuit of an embodiment of the present application. As shown in Figure 1, the power supply circuit 100 includes:

The power management module 101 is configured to respond to the enable signal sent by the application processor 102 in the terminal and provide input voltage to the display screen 103 through its own power output port;

In this embodiment of the present application, the terminal further includes an application processor, the application processor is used to send an enable signal to the power management module, and the enable signal is used to enable the power output port of the power management module.

Here, the terminal can be various types of devices with information processing capabilities, such as smart phones, PDAs (Personal Digital Assistants, personal digital assistants), navigators, digital phones, video phones, smart watches, smart bracelets, etc. Wearable devices, tablets, all-in-one computers, etc.

Here, the power management module may include multiple power output ports. The multiple power output ports may provide input voltages for different functional modules in the terminal. The multiple power output ports may also be the same functional module in the terminal. The input voltages are available at different supply voltages.

The power conversion module 104 is used to convert the voltage of the power supply 105 in the terminal into the input voltage of the display screen;

For example, if the input voltage of the display screen is -4.6V (volt), the power conversion module is used to convert the voltage of the power supply in the terminal to -4.6V for output, providing the display screen with -4.6V input voltage.

Here, the power supply refers to an energy storage tool that provides power for the terminal, and can be composed of three parts: a battery core, a protection circuit, and a casing. For example, if the terminal is a mobile phone, the power source is a mobile phone battery.

The switch module 106 is configured to control the power conversion module 104 to provide the input voltage to the display screen 103 when it is determined based on the input voltage of the display screen that the output voltage of the power output port does not meet the conditions.

For example, if the input voltage of the display screen is -4.6V and the voltage output by the power output port of the power management module is -1V, then the output voltage of the power output port is equal to the input voltage of the display screen. Does not match, that is, it is determined based on the input voltage of the display screen that the output voltage of the power output port does not meet the conditions. In this case, the power conversion module provides the input voltage to the display screen (the power conversion module converts the voltage of the power supply into the input voltage of the display screen, and then provides the converted voltage to the the display screen).

In some embodiments, the power management module may be a PMIC (Power Management Integrated Circuits, power management chip), and the power conversion module may be a DCDC (Direct Current, DC converter).

Of course, in the embodiment of the present application, there is no limitation on the specific implementation of the power management module and the power conversion module.

In the embodiment of the present application, the power management module is used to respond to the enable signal sent by the application processor in the terminal and provide input voltage to the display screen through its own power output port; the power conversion module is used to convert the The voltage of the power supply in the terminal is converted into the input voltage of the display screen; a switch module is used to control the power conversion when determining that the output voltage of the power output port does not meet the conditions based on the input voltage of the display screen. The module provides the input voltage to the display screen, thus effectively preventing the display screen from turning yellow instantly when the system starts abnormally.

Based on the foregoing embodiments, embodiments of the present application further provide a power supply circuit for a display screen in a terminal. The power supply circuit includes:

A power management module, configured to respond to the enable signal sent by the application processor in the terminal and provide input voltage to the display screen through its own power output port;

A power conversion module, used to convert the voltage of the power supply in the terminal into the input voltage of the display screen;

triode;

The transistor is used to be in a conducting state when the output voltage of the electric energy output port is greater than the first preset voltage, or when the output voltage of the electric energy output port is less than the second preset voltage, so that the The power conversion module provides the input voltage to the display screen.

In this embodiment of the present application, the terminal further includes an application processor, the application processor is used to send an enable signal to the power management module, and the enable signal is used to enable the power output port of the power management module.

Here, if the voltage of the power supply in the terminal does not match the input voltage of the display screen, a power conversion module is used to convert the voltage of the power supply in the terminal into the input voltage of the display screen.

In the embodiment of the present application, the transistor is a switch transistor, which works in the cut-off region and the saturation region, and its main function is to cut off and conduct the circuit. Of course, the embodiments of this application do not specifically limit the type and model of the triode.

In the embodiment of the present application, the transistor is in a cut-off state when the output voltage of the power output port is less than the first preset voltage and greater than the second preset voltage, and the input voltage of the display screen Provided by the power management module. Here, the first preset voltage is greater than the second preset voltage.

In the embodiment of the present application, the first preset voltage is configured as the sum of the output voltage of the power conversion module and the conduction voltage of the transistor; the second preset voltage is configured as the sum of the output voltage of the power conversion module and the conduction voltage of the triode. The difference between the output voltage and the conduction voltage of the triode.

Here, the conduction voltage of the triode is also called the conduction voltage difference. For example, an NPN (NPN type triode, NPN type triode) in a silicon tube conducts when its base is about 0.5V greater than the emitter. The PNP (PNP type triode, PNP type triode) in the silicon tube conducts when the emission maximum is about 0.7V greater than the base. The NPN in the germanium tube is turned on when its base is about 0.3V greater than the emitter. Different materials, types, and models will cause transistors to have different conduction voltages. Here, the type of transistor used in the power supply circuit corresponds to the conduction voltage of this transistor.

In some embodiments, the power management module may be a PMIC, and the power conversion module may be a DCDC.

Based on the foregoing embodiments, embodiments of the present application further provide a power supply circuit for a display screen in a terminal. The power supply circuit includes:

A power management module, configured to respond to the enable signal sent by the application processor in the terminal and provide input voltage to the display screen through its own power output port;

A power conversion module, used to convert the voltage of the power supply in the terminal into the input voltage of the display screen;

triode;

The transistor is used to be in a conducting state when the output voltage of the electric energy output port is greater than the first preset voltage, or when the output voltage of the electric energy output port is less than the second preset voltage, so that the The power conversion module provides the input voltage to the display screen;

The compensation circuit of the triode is used to prevent the triode from generating overcharge voltage when it is turned on or off.

In the embodiment of the present application, the power supply circuit may also include a compensation circuit for the transistor composed of a capacitor and a resistor. Its main function is to prevent the transistor from generating an overcharge voltage when it is turned on or off, which affects the terminal. normal use or life.

In some embodiments, the power management module may be a PMIC, and the power conversion module may be a DCDC.

Based on the foregoing embodiments, embodiments of the present application further provide a power supply circuit for a display screen in a terminal. The power supply circuit includes:

A power management module, configured to respond to the enable signal sent by the application processor in the terminal and provide input voltage to the display screen through its own power output port;

A power conversion module, used to convert the voltage of the power supply in the terminal into the input voltage of the display screen;

diode;

The diode is configured to be in a conducting state when the output voltage of the power output port is less than the output voltage of the power conversion module, so that the power conversion module provides the input voltage to the display screen. .

On the contrary, the diode is in a cut-off state when the output voltage of the power output port is greater than the output voltage of the power conversion module, and the input voltage of the display screen is provided by the power management module.

In the embodiment of the present application, a diode can also be used as a switch to turn on and off the circuit. Of course, the type and model of the diode are not specifically limited in the embodiments of this application.

In some embodiments, the power management module may be a PMIC, and the power conversion module may be a DCDC.

Based on the foregoing embodiments, an embodiment of the present application further provides a power supply circuit for a display screen in a terminal. Figure 2 is a second structural principle diagram of the power supply circuit of an embodiment of the present application. As shown in Figure 2, the power supply circuit 200 includes:

The main power management module 201 is used to respond to the enable signal sent by the application processor 202 in the terminal and provide input voltage to the display screen 203 through its own power output port;

In this embodiment of the present application, the terminal further includes an application processor, the application processor is used to send an enable signal to the main power management module, and the enable signal is used to enable the power of the main power management module. output port.

Here, the main power management module may include multiple power output ports. The multiple power output ports may provide input voltages for different functional modules in the terminal. The multiple power output ports may also be for the same function in the terminal. Different supply voltages of the module provide the input voltage.

The power management module 204 is configured to provide the input voltage to the display screen 203 in response to the turning on of the power key 205 in the terminal;

In the embodiment of the present application, the slave power management module is not controlled by the application processor. When the power button of the terminal is turned on, the slave power management module starts working.

Here, the slave power management module may include multiple power output ports. The multiple power output ports may provide input voltages for different functional modules in the terminal. The multiple power output ports may also be for the same function in the terminal. Different supply voltages of the module provide the input voltage.

Wherein, the main power management module 201 and the slave power management module 204 are connected in parallel.

In this embodiment of the present application, the main power management module and the slave power management module are connected in parallel to form a parallel power management module that provides input voltage for the display screen.

In some embodiments, the master power management module may be a PMIC, and the slave power management module may be a PMIC.

Of course, in the embodiment of the present application, there is no restriction on the specific implementation of the main power management module and the slave power conversion module.

In the embodiment of the present application, the main power management module is used to respond to the enable signal sent by the application processor in the terminal and provide input voltage to the display screen through its own power output port; the slave power management module is used to In response to the turning on of the power button in the terminal, the input voltage is provided to the display screen; wherein the main power management module and the slave power management module are connected in parallel. In this way, the display can be effectively prevented under abnormal system startup conditions. The screen turns yellow instantly.

Based on the foregoing embodiments, this embodiment of the present application provides a power supply method for a display screen in a terminal. Figure 3 is a schematic diagram 1 of the implementation flow of the power supply method of this embodiment of the present application. As shown in Figure 3, the method includes:

Step S301: The power management module of the terminal responds to the enable signal sent by the application processor in the terminal and provides input voltage to the display screen through its own power output port;

Step S302: The power conversion module of the terminal converts the voltage of the power supply in the terminal into the input voltage of the display screen;

Step S303: If the switch module of the terminal determines that the output voltage of the power output port does not meet the conditions based on the input voltage of the display screen, it controls the power conversion module to provide the input voltage to the display screen.

In the embodiment of the present application, the power management module of the terminal responds to the enable signal sent by the application processor in the terminal and provides input voltage to the display screen through its own power output port; the power conversion module of the terminal Convert the voltage of the power supply in the terminal to the input voltage of the display screen; when the switch module of the terminal determines that the output voltage of the power output port does not meet the conditions based on the input voltage of the display screen, it controls all The power conversion module provides the input voltage to the display screen, thereby effectively preventing the display screen from turning yellow instantly when the system starts abnormally.

Based on the foregoing embodiments, this embodiment of the present application provides a power supply method for a display screen in a terminal. Figure 4 is a schematic diagram 2 of the implementation flow of the power supply method of this embodiment of the present application. As shown in Figure 4, the method includes:

Step S401: The main power management module of the terminal responds to the enable signal sent by the application processor in the terminal and provides input voltage to the display screen through its own power output port;

Step S402: The slave power management module of the terminal responds to the turning on of the power key in the terminal and provides the input voltage to the display screen;

Wherein, the main power management module and the slave power management module are connected in parallel.

In the embodiment of the present application, the main power management module of the terminal responds to the enable signal sent by the application processor in the terminal and provides input voltage to the display screen through its own power output port; the slave power supply of the terminal The management module responds to the turning on of the power button in the terminal and provides the input voltage to the display screen; wherein the main power management module and the slave power management module are connected in parallel, thus effectively preventing abnormal system start-up situations. The lower display screen turns yellow instantly.

Figure 5A is a functional block diagram of the power supply system of a display screen in related art. As shown in Figure 5A, the driving circuit of the existing AMOLED (Active Matrix Organic Light-Emitting Diode, active matrix organic light-emitting diode panel) display screen 51 is A separate PMIC 52 outputs the driving voltage, and the PMIC 52 adjusts the corresponding output voltage according to the power supply voltage value required by the AMOLED display 51, as well as the timing requirements of different power supply voltages. The power supplies required by the AMOLED display screen 51 are three power supply voltages: AVDD (the driving power supply of the AMOLED display screen), ELVDD (the anode power supply of the luminescent layer of the AMOLED display screen), and ELVSS (the cathode power supply of the luminescent layer of the AMOLED display screen), and The specific values of these three power supply voltages are determined by the AMOLED display 51 . The AP 53 (Application Processor) of the terminal controls the input driving power of the AMOLED display 51 by controlling the output of the PMIC 52 . ASWIRE and ESWIRE are input control signals of PMIC 52 respectively, which are output by AP 53. ASWIRE is used to control the enable and output voltage value of the power supply AVDD of PMIC 52. ESWIRE is used to control the enablement of the power supply ELVDD of the PMIC 52, and is also used to control the enablement and output voltage value of the power supply ELVSS of the PMIC 52.

However, in the above-mentioned power supply system, the following shortcomings are found: if the system startup is unstable during the terminal startup process, the ELVSS power supply voltage value output by the PMIC 52 will be 0V or the output ELVSS power supply voltage will be larger than the normal voltage. In this way, the normal ELVSS power supply voltage value is -4.6V. If the ELVSS power supply voltage is greater than or equal to -3V, the AMOLED display 51 will turn yellow.

Therefore, based on the foregoing embodiments, the embodiment of the present application further provides a power supply circuit for the display screen in the terminal. The power supply circuit adopts a dual-channel power supply circuit power supply scheme. Figure 5B is the structural principle diagram 3 of the power supply circuit of the embodiment of the present application. , as shown in Figure 5B, the power supply circuit 500 includes: PMIC 501, AMOLED display 502, DCDC circuit 503, switch S1504, resistor R1 505 and capacitor C1 506, where:

When the ELVSS power voltage output of the PMIC 501 is abnormal, it can be automatically switched to the backup power supply DCDC circuit 503 in real time by turning on the switch S1 504. The ELVSS power supply of the AMOLED display 502 is provided by the backup power supply DCDC circuit 503. ELVSS is a fixed voltage value required by the AMOLED display 502. The PMIC 501 is a power management chip that can output multiple power supplies. One of the power supplies can output the ELVSS voltage to supply power to the ELVSS power port of the AMOLED display 502. Switch S1 504 For a triode.

The working principle of the above power supply circuit 500 is: under normal operating conditions, the ELVSS power supply of the AMOLED display 502 is provided by the PMIC 501, the switch S1 504 is turned off, and the DCDC circuit 503 is in a waiting state. When the output power supply of PMIC 501 is abnormal, Vpmic (the output voltage of PMIC 501)>Vdcdc (the output voltage of DCDC circuit 503) + 0.5V (the conduction voltage of transistor switch S1 504), or Vpmic (the output voltage of PMIC 501) When <Vdcdc (the output voltage of the DCDC circuit 503 terminal)-0.5V (the conduction voltage of the transistor switch S1 504), the switch S1 504 is turned on. At this time, the DCDC circuit 503 provides power to the AMOLED display 502. The resistor R1 505 and the capacitor C1 506 form a compensation circuit of the switch S1 504 to prevent overcharge voltage from being generated when the switch is turned on and off instantaneously.

Correspondingly, the above-mentioned power supply circuit 500 corresponds to a power supply method. Figure 5C is a schematic diagram 3 of the implementation flow of the power supply method according to the embodiment of the present application. As shown in Figure 5C, the method includes:

Step S501: Determine whether the output voltage of the power management chip PMIC is normal;

Here, if the output voltage of the PMIC is normal, step S502 is executed; if the output voltage of the PMIC is abnormal, step S503 is executed.

Step S502: Use the PMIC to power the ELVSS power port of the AMOLED display;

Step S503: Determine whether the output voltage of the DCDC circuit is normal;

In the embodiment of the present application, whether the output voltage of the DCDC circuit is normal refers to whether the output voltage of the DCDC circuit is consistent with the input voltage of the ELVSS power port of the AMOLED display screen.

Here, if the output voltage of the DCDC circuit is normal, step S504 is performed.

Step S504: Determine whether the output voltage of the PMIC is greater than the first preset value, or whether the output voltage of the PMIC is less than the second preset value;

Here, the first preset value = the output voltage of the DCDC circuit + the conduction voltage of the triode; the second preset value = the output voltage of the DCDC circuit - the conduction voltage of the triode.

Here, if the output voltage of the PMIC is greater than the first preset value, or the output voltage of the PMIC is less than the second preset value, step S505 is performed.

Step S505: Use the DCDC circuit to supply power to the ELVSS power port of the AMOLED display screen.

In the embodiment of the present application, if the output voltage of the PMIC is greater than the first preset value, or the output voltage of the PMIC is less than the second preset value, the DCDC circuit outputs ELVSS to power the ELVSS power port of the AMOLED display.

In the embodiment of the present application, adding a backup power supply circuit effectively prevents the display screen from turning yellow instantly when the system starts abnormally, and improves the user's physical examination effect.

Based on the foregoing embodiments, an embodiment of the present application further provides a power supply circuit for a display screen in a terminal. Figure 6 is a structural principle diagram 4 of the power supply circuit of an embodiment of the present application. As shown in Figure 6, the power supply circuit 600 includes: PMIC 601, AMOLED display 602, DCDC circuit 603 and diode D1 604, including:

When the ELVSS power voltage output of the PMIC 601 is abnormal, it can be automatically switched to the backup power supply DCDC circuit 603 in real time through the conduction of the diode D1 604. The ELVSS power supply of the AMOLED display 602 is provided by the backup power DCDC circuit 603. ELVSS is a fixed voltage value required by the AMOLED display 602. The PMIC 601 is a power management chip that can output multiple power supplies, one of which can output the ELVSS voltage to supply power to the ELVSS power port of the AMOLED display 602.

The working principle of the above power supply circuit 600 is: under normal operating conditions, the ELVSS power supply of the AMOLED display 602 is provided by the PMIC 601, the diode D1 604 is disconnected, and the DCDC circuit 603 is in a waiting state. When the output power supply of PMIC 601 is abnormal and Vpmic (the output voltage at the PMIC 601 terminal) < Vdcdc (the output voltage at the DCDC circuit 603 terminal), the diode D1 604 is conductive. At this time, the DCDC circuit 603 provides power to the AMOLED display 602.

In the embodiment of the present application, adding a backup power supply circuit effectively prevents the display screen from turning yellow instantly when the system starts abnormally, and improves the user's physical examination effect.

Based on the foregoing embodiments, this embodiment of the present application further provides a power supply circuit for a display screen in a terminal. Figure 7 is a structural schematic diagram 5 of the power supply circuit of an embodiment of this application. As shown in Figure 7, the power supply circuit 700 includes: The first PMIC 701, the second PMIC 702, the AMOLED display 703 and the application processor AP 704, including:

The first PMIC 701 and the second PMIC 702 are connected in parallel, that is, the AMOLED display 703 is powered by two PMICs in parallel. The first PMIC 701 is set as the master PMIC, and the second PMIC 702 is set as the slave PMIC. The first PMIC 701 is a power management chip dedicated to the AMOLED display 703 and is controlled by the system AP 704. The second PMIC 702 is a conventional multi-channel adjustable power management chip, and is designed to output voltage upon startup to provide power to the AMOLED display 703 at any time.

In this way, in the embodiment of the present application, adding a backup power supply circuit effectively prevents the display screen from turning yellow instantly when the system starts abnormally, and at the same time, all three power supplies of the AMOLED display are backed up.

The description of the above method embodiment is similar to the description of the above circuit embodiment, and has similar beneficial effects as the circuit embodiment. For technical details not disclosed in the method embodiments of this application, please refer to the description of the circuit embodiments of this application for understanding.

In the several embodiments provided in this application, it should be understood that the disclosed circuits and methods can be implemented in other ways. The circuit embodiments described above are only illustrative. For example, the division of the units is only a logical function division. In actual implementation, there may be other division methods, such as: multiple units or components may be combined, or can be integrated into another system, or some features can be ignored, or not implemented. In addition, the coupling, direct coupling, or communication connection between the components shown or discussed may be through some interfaces, and the indirect coupling or communication connection of the devices or units may be electrical, mechanical, or other forms. of.

The units described above as separate components may or may not be physically separated. The components shown as units may or may not be physical units, that is, they may be located in one place or distributed to multiple network units; Some or all of the units can be selected according to actual needs to achieve the purpose of the solution of this embodiment.

The methods disclosed in several method embodiments provided in this application can be combined arbitrarily to obtain new method embodiments without conflict.

The features disclosed in several product embodiments provided in this application can be combined arbitrarily without conflict to obtain new product embodiments.

The features disclosed in several method or device embodiments provided in this application can be combined arbitrarily without conflict to obtain new method embodiments or device embodiments.

The above are only specific embodiments of the present application, but the protection scope of the present application is not limited thereto. Any person familiar with the technical field can easily think of changes or substitutions within the technical scope disclosed in the present application. should be covered by the protection scope of this application. Therefore, the protection scope of this application should be subject to the protection scope of the claims.

Claims (7)

1. A power supply circuit for a display screen in a terminal, characterized in that the circuit includes: A power management module, configured to respond to the enable signal sent by the application processor in the terminal and provide input voltage to the display screen through its own power output port; A power conversion module, used to convert the voltage of the power supply in the terminal into the input voltage of the display screen; Switch module, the switch module includes: a triode; the triode is used for the output voltage at the power output port to be greater than the first preset voltage, or the output voltage of the power output port to be less than the second preset voltage. In this case, it is in a conductive state, so that the power conversion module provides the input voltage to the display screen; The first preset voltage is configured as the sum of the output voltage of the power conversion module and the conduction voltage of the triode; the second preset voltage is configured as the output voltage of the power conversion module and the sum of the conduction voltage of the transistor. The difference between the conduction voltages of the transistors. 2. The circuit of claim 1, wherein the switch module further includes: The compensation circuit of the triode is used to prevent the triode from generating an overcharge voltage when it is turned on or off. 3. The circuit according to claim 1 or 2, characterized in that the power management module is a power management chip, and the power conversion module is a DC converter. 4. A power supply circuit for a display screen in a terminal, characterized in that the circuit includes: The main power management module is used to respond to the enable signal sent by the application processor in the terminal and provide input voltage to the display screen through its own power output port; A power management module configured to provide the input voltage to the display screen in response to the turning on of the power key in the terminal; Wherein, the main power management module and the slave power management module are connected in parallel; Wherein, the slave power management module includes a plurality of power output ports, and the plurality of power output ports provide input voltages for different power supply voltages of the same functional module in the terminal; the functional module includes the display screen. 5. The circuit according to claim 4, characterized in that both the master power management module and the slave power management module are power management chips. 6. A method for powering a display screen in a terminal, characterized in that the method includes: The power management module of the terminal responds to the enable signal sent by the application processor in the terminal and provides input voltage to the display screen through its own power output port; The power conversion module of the terminal converts the voltage of the power supply in the terminal into the input voltage of the display screen; The switch module of the terminal includes a triode, and the triode is in conductive state when the output voltage of the power output port is greater than the first preset voltage, or when the output voltage of the power output port is less than the second preset voltage. On state, so that the power conversion module provides the input voltage to the display screen; The first preset voltage is configured as the sum of the output voltage of the power conversion module and the conduction voltage of the triode; the second preset voltage is configured as the output voltage of the power conversion module and the sum of the conduction voltage of the transistor. The difference between the conduction voltages of the transistors. 7. A power supply method for a display screen in a terminal, characterized in that the method includes: The main power management module of the terminal responds to the enable signal sent by the application processor in the terminal and provides input voltage to the display screen through its own power output port; The slave power management module of the terminal provides the input voltage to the display screen in response to the turning on of the power key in the terminal; Wherein, the main power management module and the slave power management module are connected in parallel; Wherein, the slave power management module includes a plurality of power output ports, and the plurality of power output ports provide input voltages for different power supply voltages of the same functional module in the terminal; the functional module includes the display screen.