CN111899681B - Power supply circuit and method for display screen in terminal - Google Patents
Power supply circuit and method for display screen in terminal Download PDFInfo
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- CN111899681B CN111899681B CN202010755830.0A CN202010755830A CN111899681B CN 111899681 B CN111899681 B CN 111899681B CN 202010755830 A CN202010755830 A CN 202010755830A CN 111899681 B CN111899681 B CN 111899681B
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- 238000000034 method Methods 0.000 title claims abstract description 37
- 238000006243 chemical reaction Methods 0.000 claims abstract description 45
- 229920001621 AMOLED Polymers 0.000 description 31
- HEZMWWAKWCSUCB-PHDIDXHHSA-N (3R,4R)-3,4-dihydroxycyclohexa-1,5-diene-1-carboxylic acid Chemical compound O[C@@H]1C=CC(C(O)=O)=C[C@H]1O HEZMWWAKWCSUCB-PHDIDXHHSA-N 0.000 description 25
- 238000010586 diagram Methods 0.000 description 18
- 230000002159 abnormal effect Effects 0.000 description 11
- 238000004383 yellowing Methods 0.000 description 8
- 239000003990 capacitor Substances 0.000 description 3
- 238000011161 development Methods 0.000 description 3
- 230000000694 effects Effects 0.000 description 3
- 238000005516 engineering process Methods 0.000 description 3
- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical compound [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 description 2
- 230000005856 abnormality Effects 0.000 description 2
- 229910052710 silicon Inorganic materials 0.000 description 2
- 239000010703 silicon Substances 0.000 description 2
- 230000004913 activation Effects 0.000 description 1
- 238000004891 communication Methods 0.000 description 1
- 238000004146 energy storage Methods 0.000 description 1
- 229910052732 germanium Inorganic materials 0.000 description 1
- GNPVGFCGXDBREM-UHFFFAOYSA-N germanium atom Chemical compound [Ge] GNPVGFCGXDBREM-UHFFFAOYSA-N 0.000 description 1
- 230000010365 information processing Effects 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 238000011160 research Methods 0.000 description 1
- 238000012163 sequencing technique Methods 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
Classifications
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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
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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
- G09G2330/00—Aspects of power supply; Aspects of display protection and defect management
- G09G2330/02—Details of power systems and of start or stop of display operation
- G09G2330/026—Arrangements or methods related to booting a display
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- Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Computer Hardware Design (AREA)
- General Physics & Mathematics (AREA)
- Theoretical Computer Science (AREA)
- Control Of Indicators Other Than Cathode Ray Tubes (AREA)
- Power Sources (AREA)
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
Technical Field
The embodiment of the application relates to electronic technology, in particular to a power supply circuit and a method for a display screen in a terminal.
Background
Currently, with the rapid development of electronic communication technology, portable terminal products such as smart phones and tablet computers have been deep into aspects of daily life of people, and become indispensable products in work, study and life. The display screen of the terminal product is also transited from the traditional display screen which cannot be touched to the touch display screen, meanwhile, the size of the display screen is also larger along with the development of the terminal technology, and the importance degree of the display screen in the development process of the terminal is higher.
However, in the process of using the terminal product by the user, the situation that the display screen suddenly turns yellow sometimes occurs, so that the experience of the user is very unfriendly, the user feels that he or she purchases a product with problems, and therefore, how to solve the problem that the display screen suddenly turns yellow becomes a research hotspot for those skilled in the art.
Disclosure of Invention
In view of this, the embodiment of the application provides a power supply circuit and a method for a display screen in a terminal.
The technical scheme of the embodiment of the application is realized as follows:
in a first aspect, an embodiment of the present application provides a power supply circuit for a display screen in a terminal, where the circuit includes:
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.
In a second aspect, an embodiment of the present application further provides a power supply circuit for a display screen in a terminal, where the circuit includes:
the main power supply 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 electric energy output port of the main power supply management module;
the slave power management module is used for responding to the starting of a power key in the terminal and providing the input voltage for the display screen;
wherein the master power management module is connected in parallel with the slave power management module.
In a third aspect, an embodiment of the present application provides a method for supplying power to a display screen in a terminal, where the method includes:
the power management module of the terminal responds to the enabling signal sent by the application processor in the terminal and provides input voltage for the display screen through the electric energy output port of the power management module of the terminal;
the power supply conversion module of the terminal converts the voltage of a power supply in the terminal into the input voltage of the display screen;
and the switch module of the terminal controls 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.
In a fourth aspect, an embodiment of the present application further provides a method for powering a display screen in a terminal, where the method includes:
the main power management module of the terminal responds to the enabling signal sent by the application processor in the terminal and provides input voltage for the display screen through the electric energy output port of the main power management module;
the slave power management module of the terminal responds to the starting of a power key in the terminal and provides the input voltage for the display screen;
wherein the master power management module is connected in parallel with the slave power management module.
The embodiment of the application provides a power supply circuit and a method for a display screen in a terminal, wherein the circuit comprises the following components: 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; the switch module is used for controlling the power 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, so that the phenomenon of instant yellowing of the display screen under the abnormal condition of system starting can be effectively prevented.
Drawings
FIG. 1 is a schematic diagram of a power supply circuit according to an embodiment of the present application;
FIG. 2 is a schematic diagram of a power supply circuit according to an embodiment of the present application;
FIG. 3 is a schematic diagram of a power supply method according to an embodiment of the present application;
FIG. 4 is a second schematic diagram of an implementation flow of a power supply method according to an embodiment of the present application;
FIG. 5A is a functional block diagram of a power supply system for a display screen according to the related art;
FIG. 5B is a schematic diagram of a power supply circuit according to an embodiment of the present application;
FIG. 5C is a third schematic diagram of an implementation flow of a power supply method according to an embodiment of the present application;
FIG. 6 is a schematic diagram of a power supply circuit according to an embodiment of the present application;
fig. 7 is a schematic diagram of a power supply circuit according to an embodiment of the present application.
Detailed Description
The technical scheme of the application is further elaborated below with reference to the drawings and examples. It will be apparent that the described embodiments are only some, but not all, embodiments of the application. All other embodiments, which can be made by those skilled in the art based on the embodiments of the application without making any inventive effort, are intended to fall within the scope of the application.
In the following description, reference is made to "some embodiments" which describe a subset of all possible embodiments, but it is to be understood that "some embodiments" can be the same subset or different subsets of all possible embodiments and can be combined with one another without conflict.
In the following description, suffixes such as "module", "component", or "unit" for representing elements are used only for facilitating the description of the present application, and have no specific meaning per se. Thus, "module," "component," or "unit" may be used in combination.
It should be noted that the term "first\second\third" related to the embodiments of the present application is merely to distinguish similar objects, and does not represent a specific order for the objects, it being understood that the "first\second\third" may interchange a specific order or sequencing, where allowed, so that the embodiments of the present application described herein can be implemented in an order other than illustrated or described herein.
An embodiment of the present application provides a power supply circuit of a display screen in a terminal, fig. 1 is a schematic structural diagram of the power supply circuit of the embodiment of the present application, as shown in fig. 1, the power supply circuit 100 includes:
the power management module 101 is configured to provide an input voltage to the display screen 103 through its own power output port in response to an enable signal sent by the application processor 102 in the terminal;
in an embodiment of the present application, the terminal further includes an application processor, where the application processor is configured to send an enable signal to the power management module, and the enable signal is configured to enable an electrical energy output port of the power management module.
Here, the terminal may be various types of devices having information processing capability, such as a smart phone, a PDA (Personal Digital Assistant ), a navigator, a digital phone, a video phone, a smart watch, a smart bracelet, a wearable device, a tablet computer, an all-in-one, and the like.
Here, the power management module may include a plurality of power output ports, where the plurality of power output ports may provide input voltages for different functional modules in the terminal, and the plurality of power output ports may also provide input voltages for different power supply voltages of the same functional module in the terminal.
A power conversion module 104, configured to convert a voltage of a power supply 105 in the terminal into an input voltage of the display screen;
for example, if the input voltage of the display screen is-4.6V (volts), the power conversion module is configured to convert the voltage of the power supply in the terminal into-4.6V for output, and provide the input voltage of-4.6V for the display screen.
Here, the power source refers to an energy storage tool for providing power to the terminal, and may be composed of three parts: the battery cell, protection circuit and shell. For example, if the terminal is a mobile phone, the power source is a mobile phone battery.
And 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 that the output voltage of the power output port does not meet the condition based on the input voltage of the display screen.
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, the output voltage of the power output port does not match the input voltage of the display screen, that is, it is determined that the output voltage of the power output port does not meet the condition based on the input voltage of the display screen. In this case, the power conversion module supplies 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 supplies the converted voltage to 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) converter.
Of course, in the embodiment of the present application, the specific implementation of the power management module and the power conversion module is not limited.
In the embodiment of the application, 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 self electric energy output port; 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; the switch module is used for controlling the power 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, so that the phenomenon of instant yellowing of the display screen under the abnormal condition of system starting can be effectively prevented.
Based on the foregoing embodiments, an embodiment of the present application further provides a power supply circuit for a display screen in a terminal, where the power supply circuit includes:
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;
a triode;
and the triode is in a conducting state when the output voltage of the electric energy output port is larger than a first preset voltage or smaller than a second preset voltage, so that the power supply conversion module provides the input voltage for the display screen.
In an embodiment of the present application, the terminal further includes an application processor, where the application processor is configured to send an enable signal to the power management module, and the enable signal is configured to enable an electrical energy output port of the power management module.
Here, if the voltage of the power supply in the terminal does not coincide with the input voltage of the display screen, the voltage of the power supply in the terminal is converted into the input voltage of the display screen using a power conversion module.
In the embodiment of the application, the triode is a switching triode (Switch Transistor) which works in a cut-off area and a saturation area and mainly aims at cutting off and conducting a circuit. Of course, the type and model of the triode are not particularly limited in the embodiment of the application.
In the embodiment of the application, the triode is in a cut-off state when the output voltage of the electric energy output port is smaller than the first preset voltage and larger than the second preset voltage, and the input voltage of the display screen is 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 a sum of an output voltage of the power conversion module and a turn-on voltage of the triode; the second preset voltage is configured as the difference between the output voltage of the power conversion module and the conducting voltage of the triode.
Here, the on voltage of the transistor is also referred to as an on voltage difference, and for example, the base of an NPN (NPN type transistor) in a silicon transistor is turned on when the base is larger than the emitter by about 0.5V. The emitter of PNP (PNP type triode) in the silicon tube is conducted when the emitter is larger than the base by about 0.7V. The base of NPN in the germanium tube is larger than the emitter by about 0.3V. Different materials, different types and different models can lead to different on-voltages of the triode. Here, what kind of transistor is used in the power supply circuit corresponds to the on voltage of the 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, an embodiment of the present application further provides a power supply circuit for a display screen in a terminal, where the power supply circuit includes:
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;
a triode;
the triode is in a conducting state when the output voltage of the electric energy output port is larger than a first preset voltage or smaller than a second preset voltage, so that the power supply conversion module provides the input voltage for the display screen;
and the compensating circuit of the triode is used for preventing the triode from generating overcharging voltage when being switched on or off.
In the embodiment of the application, the power supply circuit can also comprise a compensation circuit of the triode, which is formed by a capacitor and a resistor, and mainly has the function of preventing the triode from generating overcharging voltage when being connected or disconnected, thereby influencing the normal use or the service life of a terminal.
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, where the power supply circuit includes:
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;
a diode;
and the diode is in a conducting state under the condition that the output voltage of the electric energy output port is smaller than the output voltage of the power conversion module, so that the power conversion module provides the input voltage for the display screen.
And on the contrary, the diode is in a cut-off state under the condition that the output voltage of the electric energy output port is larger than the output voltage of the power supply conversion module, and the input voltage of the display screen is provided by the power supply management module.
In the embodiment of the application, the on and off of the circuit can be realized by using the diode as a switch. Of course, the type and model of the diode are not particularly limited in the embodiment of the present 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, the embodiment of the present application further provides a power supply circuit for a display screen in a terminal, fig. 2 is a schematic structural diagram of the power supply circuit according to the embodiment of the present application, and as shown in fig. 2, the power supply circuit 200 includes:
a main power management module 201, configured to provide an input voltage to the display screen 203 through its own power output port in response to an enable signal sent by the application processor 202 in the terminal;
in an embodiment of the present application, the terminal further includes an application processor, where the application processor is configured to send an enable signal to the main power management module, and the enable signal is configured to enable an electrical energy output port of the main power management module.
Here, the main power management module may include a plurality of power output ports, where the plurality of power output ports may provide input voltages for different functional modules in the terminal, and the plurality of power output ports may also provide input voltages for different power supply voltages of the same functional module in the terminal.
A slave power management module 204 for providing the input voltage to the display 203 in response to the activation of a power key 205 in the terminal;
in the embodiment of the application, the slave power management module is not controlled by the application processor, and when the power key of the terminal is started, the slave power management module starts to work.
Here, the slave power management module may include a plurality of power output ports, where the plurality of power output ports may provide input voltages for different functional modules in the terminal, and the plurality of power output ports may also provide input voltages for different power supply voltages of the same functional module in the terminal.
Wherein the master power management module 201 is connected in parallel with the slave power management module 204.
In the embodiment of the application, the master power management module and the slave power management module are connected in parallel to form a parallel power management module for providing 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, the specific implementation of the master power management module and the slave power conversion module is not limited.
In the embodiment of the application, the main 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 electric energy output port of the main power management module; the slave power management module is used for responding to the starting of a power key in the terminal and providing the input voltage for the display screen; the main power management module is connected with the auxiliary power management module in parallel, so that the phenomenon of instant yellowing of the display screen under the abnormal condition of system starting can be effectively prevented.
Based on the foregoing embodiments, the embodiment of the present application provides a power supply method for a display screen in a terminal, and fig. 3 is a schematic implementation flow diagram of the power supply method according to the embodiment of the present application, as shown in fig. 3, where the method includes:
step S301, a power management module of the terminal responds to an enabling signal sent by an application processor in the terminal, and provides input voltage for the display screen through an electric energy output port of the power management module;
step S302, a power supply conversion module of the terminal converts the voltage of a power supply in the terminal into the input voltage of the display screen;
step S303, when the switch module of the terminal determines, based on the input voltage of the display screen, that the output voltage of the electric energy output port does not meet the condition, the power conversion module is controlled to provide the input voltage to the display screen.
In the embodiment of the application, the power management module of the terminal responds to the enabling signal sent by the application processor in the terminal and provides input voltage for the display screen through the electric energy output port of the terminal; the power supply conversion module of the terminal converts the voltage of a power supply in the terminal into the input voltage of the display screen; the switch module of the terminal controls the power 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, so that the phenomenon of instant yellowing of the display screen under the abnormal condition of system starting can be effectively prevented.
Based on the foregoing embodiments, the embodiment of the present application provides a power supply method for a display screen in a terminal, and fig. 4 is a schematic diagram of a implementation flow chart of the power supply method according to the embodiment of the present application, as shown in fig. 4, where the method includes:
step S401, a main power management module of the terminal responds to an enabling signal sent by an application processor in the terminal, and provides input voltage for the display screen through an electric energy output port of the main power management module;
step S402, a slave power management module of the terminal responds to the starting of a power key in the terminal to provide the input voltage for the display screen;
wherein the master power management module is connected in parallel with the slave power management module.
In the embodiment of the application, the main power management module of the terminal responds to the enabling signal sent by the application processor in the terminal, and provides input voltage for the display screen through the electric energy output port of the main power management module; the slave power management module of the terminal responds to the starting of a power key in the terminal and provides the input voltage for the display screen; the main power management module is connected with the auxiliary power management module in parallel, so that the phenomenon of instant yellowing of the display screen under the abnormal condition of system starting can be effectively prevented.
Fig. 5A is a functional block diagram of a power supply system of a display screen in the related art, as shown in fig. 5A, the driving circuits of the conventional AMOLED (Active Matrix Organic Light-Emitting Diode) display screen 51 are all driven by a single PMIC 52 to output driving voltages, and the PMIC 52 adjusts corresponding output voltages according to the power voltage values required by the AMOLED display screen 51 and the timing requirements of different power voltages. The power supplies required by the AMOLED display 51 are three power supply voltages AVDD (driving power supply of the AMOLED display), ELVDD (anode power supply of the light emitting layer of the AMOLED display) and ELVSS (cathode power supply of the light emitting layer of the AMOLED display), and specific values of the 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 to PMIC 52, respectively, and are output from AP 53. ASWIRE is used to control the enable and output voltage values of power AVDD of PMIC 52. ESWIRE is used to control the enabling of power ELVDD of PMIC 52 and also to control the enabling and output voltage value of power ELVSS of PMIC 52.
However, in the above power supply system, the following drawbacks are found: if the system is not started stably during the terminal power-on process, the ELVSS power supply voltage outputted from the PMIC 52 is 0V or the outputted ELVSS power supply voltage is large with respect to the normal voltage. Thus, the normal ELVSS supply voltage is-4.6V, and if the ELVSS supply voltage is equal to or greater than-3V, the amoled display screen 51 will turn yellow.
Therefore, based on the foregoing embodiment, the embodiment of the present application further provides a power supply circuit for a display screen in a terminal, where the power supply circuit adopts a power supply scheme of a two-way power supply circuit, fig. 5B is a schematic structural diagram of the power supply circuit according to the embodiment of the present application, and as shown in fig. 5B, the power supply circuit 500 includes: PMIC 501, AMOLED display 502, DCDC circuit 503, switch S1 504, resistor R1 505 and capacitor C1 506, wherein:
when the ELVSS power supply voltage output of the PMIC 501 is abnormal, the ELVSS power of the AMOLED display 502 may be automatically switched to the backup power DCDC circuit 503 in real time by the on-state synchronization of the switch S1 504, which is provided by the backup power DCDC circuit 503. ELVSS is a fixed voltage value required by AMOLED display 502, PMIC 501 is a power management chip that outputs multiple power supplies, where one power supply outputs ELVSS voltage to the ELVSS power supply port of AMOLED display 502, and switch S1 504 is a transistor.
The working principle of the power supply circuit 500 is as follows: under normal operation, ELVSS power for AMOLED display 502 is provided by PMIC 501, switch S1 504 is open, and DCDC circuit 503 is in a standby state. When an abnormality occurs in the output power supply of the PMIC 501, vpmic (output voltage at the PMIC 501 terminal) > vdc (output voltage at the DCDC circuit 503 terminal) +0.5V (turn-on voltage of the triode switch S1 504), or Vpmic (output voltage at the PMIC 501 terminal) < vdc (output voltage at the DCDC circuit 503 terminal) -0.5V (turn-on voltage of the triode switch S1 504), the switch S1 504 is turned on, and the DCDC circuit 503 supplies power to the AMOLED display screen 502. The resistor R1 505 and the capacitor C1 506 form a compensation circuit of the switch S1 504, so as to prevent the generation of an overcharge voltage when the switch is turned on or turned off instantaneously.
Correspondingly, the power supply circuit 500 corresponds to a power supply method, and fig. 5C is a schematic diagram of a third implementation flow of the power supply method according to the embodiment of the present application, as shown in fig. 5C, where the method includes:
step S501, determining whether the output voltage of the PMIC is normal;
here, if the output voltage of the PMIC is normal, step S502 is performed; if the output voltage of the PMIC is abnormal, step S503 is performed.
Step S502, utilizing the PMIC to supply power to an ELVSS power port of the AMOLED display screen;
step S503, determining whether the output voltage of the DCDC circuit is normal;
in the embodiment of the application, whether the output voltage of the DCDC circuit is normal or not refers to whether the output voltage of the DCDC circuit is consistent with the input voltage of an ELVSS power supply port of an AMOLED display screen or not.
Here, if the output voltage of the DCDC circuit is normal, step S504 is performed.
Step S504, determining whether the output voltage of the PMIC is greater than a first preset value or whether the output voltage of the PMIC is less than a second preset value;
here, the first preset value=the output voltage of the DCDC circuit+the on voltage of the transistor; the second preset value=the output voltage of the DCDC circuit-the on voltage of the transistor.
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.
And step S505, supplying power to an ELVSS power supply port of the AMOLED display screen by using the DCDC circuit.
In the embodiment of the 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 for supplying power to the ELVSS power supply port of the AMOLED display screen.
In the embodiment of the application, the phenomenon of instant yellowing of the display screen under the abnormal condition of system starting is effectively prevented by adding the backup power supply circuit, and the physical examination effect of a user is improved.
Based on the foregoing embodiments, the embodiment of the present application further provides a power supply circuit for a display screen in a terminal, fig. 6 is a schematic structural diagram of the power supply circuit according to the embodiment of the present application, and as shown in fig. 6, the power supply circuit 600 includes: PMIC 601, AMOLED display 602, DCDC circuit 603 and diode D1 604, wherein:
when the ELVSS power supply voltage output of the PMIC 601 is abnormal, the ELVSS power of the AMOLED display 602 may be automatically switched to the backup power DCDC circuit 603 in real time by the on-state synchronization of the diode D1 604, which is provided by the backup power DCDC circuit 603. ELVSS is a fixed voltage value required for AMOLED display 602, and PMIC 601 is a power management chip that outputs multiple power supplies, where one power supply may output ELVSS voltage to the ELVSS power supply port of AMOLED display 602.
The working principle of the power supply circuit 600 is as follows: under normal operation, ELVSS power for AMOLED display 602 is provided by PMIC 601, diode D1 604 is off, and DCDC circuit 603 is in a standby state. When an abnormality occurs in the output power supply of the PMIC 601, vpmic (output voltage at the PMIC 601 terminal) < vdc (output voltage at the DCDC circuit 603 terminal), the diode D1 604 is turned on, and the DCDC circuit 603 supplies power to the AMOLED display 602.
In the embodiment of the application, the phenomenon of instant yellowing of the display screen under the abnormal condition of system starting is effectively prevented by adding the backup power supply circuit, and the physical examination effect of a user is improved.
Based on the foregoing embodiments, the embodiment of the present application further provides a power supply circuit for a display screen in a terminal, fig. 7 is a schematic diagram of a structure of the power supply circuit according to the embodiment of the present application, as shown in fig. 7, the power supply circuit 700 includes: a first PMIC 701, a second PMIC 702, an AMOLED display 703 and an application processor AP 704, wherein:
the first PMIC 701 and the second PMIC 702 are connected in parallel, that is, the power is supplied to the AMOLED display 703 by using the parallel of the two PMICs. The first PMIC 701 is set as a master PMIC and the second PMIC 702 is set as a 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 be turned on, i.e. output voltage, to supply power to the AMOLED display 703 at any time.
Therefore, in the embodiment of the application, the phenomenon of instant yellowing of the display screen under the abnormal condition of system starting is effectively prevented by adding the backup power supply circuit, and all three paths of power supplies of the AMOLED display screen are backed up.
The description of the method embodiments above is similar to that of the circuit embodiments above, with similar advantageous effects as the circuit embodiments. For technical details not disclosed in the method embodiments of the present application, please refer to the description of the circuit embodiments of the present application for understanding.
In the several embodiments provided in the present application, it should be understood that the disclosed circuits and methods may be implemented in other ways. The above described circuit embodiments are only illustrative, e.g. the division of the units is only a logical functional division, and there may be other divisions in practice, such as: multiple units or components may be combined or may be integrated into another system, or some features may be omitted, or not performed. In addition, the various components shown or discussed may be coupled or directly coupled or communicatively coupled to each other via some interface, whether indirectly coupled or communicatively coupled to devices or units, whether electrically, mechanically, or otherwise.
The units described as separate units may or may not be physically separate, and units displayed as units may or may not be physical units, may be located in one place, or may be distributed on a plurality of network units; some or all of the units may be selected according to actual needs to achieve the purpose of the solution of this embodiment.
The methods disclosed in the method embodiments provided by the application can be arbitrarily combined under the condition of no conflict to obtain a new method embodiment.
The features disclosed in the several product embodiments provided by the application can be combined arbitrarily under the condition of no conflict to obtain new product embodiments.
The features disclosed in the embodiments of the method or the apparatus provided by the application can be arbitrarily combined without conflict to obtain new embodiments of the method or the apparatus.
The foregoing is merely illustrative of the present application, and the present application is not limited thereto, and any person skilled in the art will readily recognize that variations or substitutions are within the scope of the present application. Therefore, the protection scope of the present application shall be subject to the protection scope of the claims.
Claims (7)
1. A power supply circuit for a display screen in a terminal, the circuit comprising:
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;
a switch module, the switch module comprising: a triode; the triode is in a conducting state when the output voltage of the electric energy output port is larger than a first preset voltage or smaller than a second preset voltage, so that the power supply conversion module provides the input voltage for the display screen;
the first preset voltage is configured as the sum of the output voltage of the power conversion module and the conducting voltage of the triode; the second preset voltage is configured as the difference between the output voltage of the power conversion module and the conducting voltage of the triode.
2. The circuit of claim 1, wherein the switch module further comprises:
and the compensation circuit of the triode is used for preventing the triode from generating overcharging voltage when being switched on or switched off.
3. The circuit of claim 1 or 2, wherein 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, the circuit comprising:
the main power supply 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 electric energy output port of the main power supply management module;
the slave power management module is used for responding to the starting of a power key in the terminal and providing the input voltage for the display screen;
wherein the master power management module is connected with the slave power management module in parallel;
the slave power management module comprises a plurality of electric energy output ports, and the electric energy output ports provide input voltages for different power supply voltages of the same functional module in the terminal; the functional module comprises the display screen.
5. The circuit of claim 4, wherein the master power management module and the slave power management module are both power management chips.
6. A method for powering a display screen in a terminal, the method comprising:
the power management module of the terminal responds to the enabling signal sent by the application processor in the terminal and provides input voltage for the display screen through the electric energy output port of the power management module of the terminal;
the power supply conversion module of the terminal converts the voltage of a power supply in the terminal into the input voltage of the display screen;
the switch module of the terminal comprises a triode, and the triode is in a conducting state under the condition that the output voltage of the electric energy output port is larger than a first preset voltage or smaller than a second preset voltage, so that the power supply conversion module provides the input voltage for the display screen;
the first preset voltage is configured as the sum of the output voltage of the power conversion module and the conducting voltage of the triode; the second preset voltage is configured as the difference between the output voltage of the power conversion module and the conducting voltage of the triode.
7. A method for powering a display screen in a terminal, the method comprising:
the main power management module of the terminal responds to the enabling signal sent by the application processor in the terminal and provides input voltage for the display screen through the electric energy output port of the main power management module;
the slave power management module of the terminal responds to the starting of a power key in the terminal and provides the input voltage for the display screen;
wherein the master power management module is connected with the slave power management module in parallel;
the slave power management module comprises a plurality of electric energy output ports, and the electric energy output ports provide input voltages for different power supply voltages of the same functional module in the terminal; the functional module comprises the display screen.
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| CN202010755830.0A CN111899681B (en) | 2020-07-31 | 2020-07-31 | Power supply circuit and method for display screen in terminal |
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| CN202010755830.0A CN111899681B (en) | 2020-07-31 | 2020-07-31 | Power supply circuit and method for display screen in terminal |
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| CN112885301B (en) * | 2021-01-20 | 2022-04-01 | 维沃移动通信有限公司 | Switching circuit, switching method and display device |
| CN114968853B (en) * | 2021-02-22 | 2023-05-26 | 荣耀终端有限公司 | Power chip management method, system and electronic equipment |
| CN114094799A (en) * | 2021-11-23 | 2022-02-25 | 无锡睿勤科技有限公司 | Power supply circuit and system for display screen |
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