CN112885301B - Switching circuit, switching method and display device - Google Patents

Switching circuit, switching method and display device Download PDF

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Publication number
CN112885301B
CN112885301B CN202110073920.6A CN202110073920A CN112885301B CN 112885301 B CN112885301 B CN 112885301B CN 202110073920 A CN202110073920 A CN 202110073920A CN 112885301 B CN112885301 B CN 112885301B
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Prior art keywords
switching module
switching
display device
module
voltage
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CN112885301A (en
Inventor
边越峰
郭彤
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Vivo Mobile Communication Co Ltd
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Vivo Mobile Communication Co Ltd
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    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G3/00—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes
    • G09G3/20—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters
    • G09G3/22—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources
    • G09G3/30—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources using electroluminescent panels
    • G09G3/32—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources using electroluminescent panels semiconductive, e.g. using light-emitting diodes [LED]
    • G09G3/3208—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources using electroluminescent panels semiconductive, e.g. using light-emitting diodes [LED] organic, e.g. using organic light-emitting diodes [OLED]
    • G09G3/3225—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources using electroluminescent panels semiconductive, e.g. using light-emitting diodes [LED] organic, e.g. using organic light-emitting diodes [OLED] using an active matrix
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J7/00—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
    • H02J7/007—Regulation of charging or discharging current or voltage
    • H02J7/00712—Regulation of charging or discharging current or voltage the cycle being controlled or terminated in response to electric parameters
    • H02J7/007182—Regulation of charging or discharging current or voltage the cycle being controlled or terminated in response to electric parameters in response to battery voltage
    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G2320/00—Control of display operating conditions
    • G09G2320/02—Improving the quality of display appearance
    • G09G2320/0247—Flicker reduction other than flicker reduction circuits used for single beam cathode-ray tubes
    • 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

Abstract

The application discloses a switching circuit, a switching method and display equipment, and belongs to the technical field of display. The switching circuit is applied to a display device, the display device comprises an AMOLED screen, and the switching circuit comprises: the device comprises an AMOLED driving chip, a display driving chip, a voltage stabilizing module, a switching module, a control unit and a PMID pin; the PMID pin is connected with the input end of the voltage stabilizing module; the control unit is connected to the control end of the switching module, the first end of the switching module is connected to the output end of the voltage stabilizing module, the second end of the switching module is connected to the driving voltage ELVDD power supply end of the AMOLED driving chip, and the third end of the switching module is connected to the ELVDD input end of the display driving chip; the control unit controls the first end or the second end of the switching module to be connected with the third end of the switching module based on the current state of the display device, wherein the current state comprises at least one of a charging state, a display state and a battery voltage state. The display effect of the AMOLED screen can be improved.

Description

Switching circuit, switching method and display device
Technical Field
The application belongs to the technical field of display, and particularly relates to a switching circuit, a switching method and display equipment.
Background
Active-Matrix Organic Light-Emitting diodes (AMOLEDs) are widely used in display devices. The control power supply of the AMOLED mainly comprises: the AMOLED display device comprises an analog power supply voltage (AVDD), a driving voltage (ELVDD) and a low-level power supply voltage (ELVSS), wherein the ELVSS can be adjusted in the process of driving the AMOLED display device to emit light, the ELVDD needs to be kept constant, and when the voltage of the ELVDD fluctuates greatly, an AMOLED screen flicker phenomenon (for example, a display picture has black stripes) can be caused.
In the related art, the Display device often supplies power to the AMOLED through a battery (VPH) to drive the AMOLED to supply ELVDD to a Display Driver IC (DDIC), and the VPH of the Display device fluctuates due to various factors, such as: when the display device with the audio playing function plays audio, VPH jitter will be caused, and at this time, the ELVDD power supplied by the AMOLED will be greatly changed, thereby causing screen flicker.
As can be seen from the above, the ELVDD power supply in the related art is unstable, so that the display performance of the AMOLED screen is poor.
Disclosure of Invention
An object of the embodiments of the present application is to provide a switching circuit, a switching method and a display device, which can solve the problem of poor display performance of an AMOLED screen due to unstable ELVDD power supply in the related art.
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 switching circuit, which is applied to a display device, where the display device includes an AMOLED screen, and the switching circuit includes: the device comprises an AMOLED driving chip, a display driving chip, a voltage stabilizing module, a switching module, a control unit and a PMID pin;
the PMID pin is connected with the input end of the voltage stabilizing module;
the control unit is connected to the control end of the switching module, the first end of the switching module is connected to the output end of the voltage stabilizing module, the second end of the switching module is connected to the ELVDD power supply end of the AMOLED driving chip, and the third end of the switching module is connected to the ELVDD input end of the display driving chip;
the control unit controls the third end of the switching module to be connected with the first end of the switching module or controls the third end of the switching module to be connected with the second end of the switching module based on the current state of the display device, wherein the current state comprises at least one of a charging state, a display state and a battery voltage state.
In a second aspect, an embodiment of the present application provides a switching method, which is applied to the switching circuit according to the first aspect, and the switching method includes:
acquiring the current state of a display device comprising the switching circuit, wherein the current state comprises at least one of a charging state, a display state and a battery voltage state;
and controlling the third end of the switching module to be connected with the first end of the switching module or controlling the third end of the switching module to be connected with the second end of the switching module according to the current state.
In a third aspect, an embodiment of the present application provides an electronic device, which includes a processor, a memory, and a program or instructions stored on the memory and executable on the processor, and when executed by the processor, the program or instructions implement the steps of the method according to the second aspect.
In a fourth aspect, the present application provides a readable storage medium, on which a program or instructions are stored, which when executed by a processor implement the steps of the method according to the second aspect.
In a fifth aspect, the present application provides a chip, where the chip includes a processor and a communication interface, where the communication interface is coupled to the processor, and the processor is configured to execute a program or instructions to implement the method according to the second aspect.
In this embodiment of the application, when the control unit determines that the AMOLED driving chip may have mode switching, or the battery voltage is increased, or the battery voltage has large fluctuation, based on the current state of the display device, the third terminal of the switching module and the first terminal of the switching module are controlled, so that before the AMOLED driving chip performs mode switching, the power supply of the ELVDD is switched to the voltage stabilizing module, and the PMID pin provides the stable ELVDD to the display driving chip through the voltage stabilizing module, so as to avoid the phenomenon that the AMOLED driving chip performs mode switching to cause screen flicker of the AMOLED screen, thereby improving the display performance of the AMOLED screen.
Drawings
FIG. 1 is a circuit diagram of an AMOLED screen;
FIG. 2 is a circuit diagram of a driving circuit of an AMOLED screen in the related art;
fig. 3 is a circuit diagram of a switching circuit according to an embodiment of the present application;
FIG. 4 is a circuit diagram of another switching circuit provided in an embodiment of the present application;
FIG. 5 is a flow chart of the operation of another switching circuit provided in the embodiments of the present application;
fig. 6 is a flowchart of a handover method according to an embodiment of the present application;
fig. 7 is a structural diagram of a display device according to an embodiment of the present application.
Detailed Description
The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application, and it is obvious that the described embodiments are some, but not all, embodiments of the present application. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present application.
The terms first, second and the like in the description and in the claims of the present application are used for distinguishing between similar elements and not necessarily for describing a particular sequential or chronological order. It will be appreciated that the data so used may be interchanged under appropriate circumstances such that embodiments of the application may be practiced in sequences other than those illustrated or described herein, and that the terms "first," "second," and the like are generally used herein in a generic sense and do not limit the number of terms, e.g., the first term can be one or more than one. In addition, "and/or" in the specification and claims means at least one of connected objects, a character "/" generally means that a preceding and succeeding related objects are in an "or" relationship.
As shown in fig. 1, the related art AMOLED screen includes an AMOLED pixel matrix 11, each of which has three self-light-emitting diodes, and controls light emission by three voltages, i.e., an analog power supply voltage (AVDD), a driving voltage (ELVDD), and a low-level power supply voltage (ELVSS), provided by a control circuit. The battery voltage is converted into ELVDD and ELVSS by the dc converter 12, and the ELVDD, and ELVDD are inputted to the display driving chip 13 to drive the light emitting diode to emit light. In which ELVDD is transmitted from the dc converter 12 to the anode of the oled unit, and ELVSS is transmitted from the dc converter 12 to the cathode of the oled unit.
In the normal working process, the value of the ELVSS can be adjusted, and the value of the ELVDD is fixed and unchanged. When an abnormality occurs, the value of ELVDD may fluctuate, and if the fluctuation of ELVDD is large, screen flicker (black stripes on the display screen) with different degrees of severity may be caused. It is necessary to maintain the stability of ELVDD.
In the related art, since the Display driving power supply of the AMOLED is provided by what we often say as bias driving, specifically, as shown in fig. 2, the AMOLED driving chip 21 provides the Display driving chip (DDIC) with ELVDD voltage (i.e. V as shown in fig. 2)ELVDD) ELVSS (i.e., V as shown in FIG. 2)ELVSS) And AVDD (i.e., V as shown in FIG. 2)AVDD) And the power supply of the AMOLED driving chip is provided by VPH (battery power supply) of the mobile phone. In practical use, the VPH of the mobile phone is also connected with other components or devices on the mobile phone to supply power to the mobile phone, for example: such as a speaker Power Amplifier 22, a Power Amplifier (PA) 23, and other devices 24 shown in fig. 2.
Thus, when the voltage of VPH rises to reach the Mode switching threshold of the AMOED driving chip ELVDD, the switching Mode of ELVDD is switched from the Continuous Conduction Mode (CCM) to the Discontinuous Conduction Mode (DCM), and during the switching of the Mode, a large overshoot voltage is generated on ELVDD. In other words, when VPH has large variation (for example, VPH jitter caused by playing music), the ELVDD operation mode of the AMOLED driving chip is frequently switched, and the screen flickers due to the fluctuation of ELVDD.
In addition, when the luminance of the AMOLED screen is low, the load on ELVDD is less than 1mA, and at this time, if VPH is jittered, the switching Mode of ELVDD switches from DCM to a Power Saving Mode (PSM), and an overshoot voltage greater than that during switching of CCM to DCM is generated, thereby aggravating the severity of screen flash.
Meanwhile, in the prior art, along with the increase of the quick charging technology, the battery capacity and the like, the battery voltage is also higher and higher, the current full-charge voltage is mostly 4.5V, and the higher battery voltage can more easily trigger the mode switching of the AMOLED driving chip, so that the screen flash problem is more easily caused.
In the switching circuit provided by the embodiment of the application, by adding the voltage stabilizing module and the switching module between the PMID pin and the ELVDD input end of the display driver chip, when it is determined that the mode switching of the AMOLED driver chip may occur based on the current state of the display device, the ELVDD input end of the display driver chip is connected with the PMID pin through the voltage stabilizing module and the switching module in time, so that the voltage on the PMID pin is converted into a stable and reliable voltage through the voltage stabilizing module, and the voltage is used as the ELVDD of the display driver chip, at this time, the ELVDD jitter of the display driver chip caused by the AMOLED driver chip in the mode switching process is avoided, and the screen flash problem of the AMOLED screen is reduced.
The switching circuit, the switching method, the display device and the readable storage medium provided by the embodiments of the present application are described in detail below with reference to the accompanying drawings by specific embodiments and application scenarios thereof.
Referring to fig. 3, a circuit diagram of a switching circuit according to an embodiment of the present application is provided, where the switching circuit is applied to a display device, and the display device includes an AMOLED screen, and as shown in fig. 3, the switching circuit includes: the driving circuit comprises an AMOLED driving chip 31, a display driving chip 32, a voltage stabilizing module 33, a switching module 34, a control unit 35 and a PMID pin 36.
The PMID pin 36 is connected to an input terminal of the voltage regulator module 33; the control unit 35 is connected to the control terminal of the switching module 34, a first terminal of the switching module 34 is connected to the output terminal of the voltage stabilizing module 33, a second terminal of the switching module 34 is connected to the driving voltage ELVDD supply terminal of the AMOLED driving chip 31, and a third terminal of the switching module 34 is connected to the ELVDD input terminal of the display driving chip 32.
In operation, the control unit 35 controls the third terminal of the switching module 34 to be connected to the first terminal of the switching module 34 or controls the third terminal of the switching module 34 to be connected to the second terminal of the switching module 34 based on the current state of the display device, wherein the current state includes at least one of a charging state, a display state and a battery voltage state.
Optionally, the AMOLED driving chip 31 and the display driving chip 32 are an AMOLED driving chip and a display driving chip in an AMOLED screen of the display device, and the control unit 35 and the PMID pin 36 may be existing components in the display device, for example: the control unit 35 is a general purpose input/output controller (GPIO) within the display device. In addition, the Display driving chip 32 may be a Display driving chip in a Liquid Crystal Display Module (LCM), for example: the LCM drives the DDIC.
In an embodiment, the switching module 34 may be a single-pole double-throw switch, in this case, the third end of the switching module 34 represents a fixed end of the single-pole double-throw switch, and the first end of the switching module 34 and the second end of the switching module 34 are two movable ends of the single-pole double-throw switch, respectively, so that the control unit 35 can control a knife gate in the single-pole double-throw switch, which is constantly connected to the fixed end, to be switched to any one of the movable ends, so as to implement: the third terminal of the switching module 34 is connected to the first terminal of the switching module 34, or the third terminal of the switching module 34 is connected to the second terminal of the switching module 34.
Of course, in a specific implementation, the switching module 34 may also be other devices or circuits capable of switching the connection relationship between the third terminal and the other two terminals, which is not specifically limited herein, and as shown in the embodiments of fig. 3 and fig. 4, the switching module 34 is only an example of a single-pole double-throw switch, which is only exemplified and not limited herein.
In implementation, the control unit 35 controls the third terminal of the switching module 34 to be connected to the first terminal of the switching module 34 based on the current state of the display device, which can be understood as: the control unit 35 controls the third terminal of the switching module 34 to be connected to the first terminal of the switching module 34 to convert the voltage on the PMID pin into a voltage available for the ELVDD of the display driving chip 32 through the voltage stabilizing module 33 under the condition that it is determined that the mode switching of the AMOLED driving chip 31 may occur or it is determined that a screen flicker problem may be caused by the fluctuation of the ELVDD according to at least one of the current states of the charging state, the display state, the battery voltage state, and the like of the display device, at this time, the voltage output by the voltage stabilizing module 33 matches the voltage value of the rated ELVDD of the voltage stabilizing module 33. When the mode switching of the AMOLED driving chip 31 does not occur, or the screen flicker problem due to the fluctuation of ELVDD does not occur, the third terminal of the switching module 34 is controlled to be connected to the second terminal of the switching module 34, that is, the battery voltage is still converted into the voltage for the ELVDD of the display driving chip 32 by the AMOLED driving chip 31, and the VPH input to the AMOLED driving chip 31 does not trigger the mode switching of the AMOLED driving chip 31.
For example: assume that the current state of the display device includes: a state of charge and a battery voltage state, and the state of charge is: is charging and is about to reach a full charge state, the battery voltage state is: the full charge voltage is greater than the mode switching threshold of the AMOLED driving chip 31, and at this time, the control unit 35 may determine that, if the user lights up the screen, the AMOLED driving chip 31 may switch the mode due to VPH exceeding the mode switching threshold, thereby causing ELVDD fluctuation, which may cause a screen flickering problem, and thus control the third terminal of the switching module 34 to be connected to the first terminal of the switching module 34.
For another example: assume that the current state of the display device includes: when the AMOLED screen is in the rest state, the control unit 35 may determine that there is no screen flicker problem caused by ELVDD fluctuation on the AMOLED screen in the rest state, so as to control the third terminal of the switching module 34 to be connected to the second terminal of the switching module 34.
For another example: the current state of the display device includes only: the state of charge, and as long as the state of charge is: when charging, the control unit 35 controls the third terminal of the switching module 34 to be connected to the first terminal of the switching module 34, so that the AMOLED screen directly draws power from VBUS, thereby reducing the consumption of the battery voltage.
It should be noted that, in addition to the above charging state, display state and battery voltage state, in practical applications, the current state of the display device may include other state information or include a combination of other state information according to the actual situation of the device, and this is not exhaustive, and it is only ensured that the determination based on the current state of the display device is: whether the mode switching of the AMOLED driving chip 31 is possible or whether there is a problem of screen flickering due to fluctuations of ELVDD.
Optionally, the voltage stabilizing module 33 is a Low DropOut linear regulator (LDO).
In this embodiment, the LDO with a good voltage stabilizing effect is adopted, and when the third end of the switch module 34 is connected to the first end of the switch module 34, the ELVDD for stabilizing the voltage can be provided to the display driver chip 32 by the LDO, so as to improve the driving reliability of the display driver chip 32.
As an optional implementation manner, in a case that the display device is not connected to the charger and the battery voltage of the display device is less than a preset voltage, the control unit 35 controls the third terminal of the switching module 34 to be connected to the second terminal of the switching module 34, where the preset voltage is matched with the mode switching threshold of the AMOLED screen;
in case that the display device is connected to the charger, the control unit 35 controls the third terminal of the switching module 34 to be connected to the first terminal of the switching module 34.
In an implementation, the mode switching threshold value is similar to the VPH threshold voltage triggering the AMOLED driving chip to switch from CCM to DCM and the VPH threshold voltage triggering the AMOLED driving chip to switch from DCM to PSM in the prior art, and the preset voltage may be a voltage value slightly smaller than the mode switching threshold value, for example: assuming that the mode switching threshold of the AMOLED driving chip is equal to 4.6V (volts), the preset voltage may be equal to 4.58V or 4.59V.
In a first case, when the display device is not connected to the charger and the battery voltage of the display device is less than the preset voltage, the control unit 35 controls the third terminal of the switching module 34 to be connected to the second terminal of the switching module 34, which is also implicitly represented as: when the display device is not connected to the charger and the battery voltage of the display device is greater than or equal to the preset voltage, the control unit 35 controls the third terminal of the switching module 34 to be connected to the first terminal of the switching module 34.
In other words, when the VPH fluctuation is large, the control unit 35 will switch the ELVDD input terminal of the display driver chip 32 to be connected to the voltage regulator module 33 before the AMOLED driver chip 31 performs the mode switching.
Thus, ELVDD jitter of the display driver chip 32 caused by mode switching of the AMOLED driver chip 31 can be avoided, and the problem of screen flashing of the AMOLED screen can be reduced.
In case two, in the above case where the display device is connected to the charger, the control unit 35 controls the third terminal of the switching module 34 to be connected to the first terminal of the switching module 34, and it can be understood that: in the case where the display device is in the charging process, the control unit 35 controls the switching module 34 to switch the ELVDD input terminal of the display driving chip 32 to be connected to the voltage stabilization module 33, so that the stabilized ELVDD stabilization is provided to the display driving chip 32 by the voltage stabilization module 33.
In this way, the depletion of the battery in the display device can be reduced; in addition, the probability that the battery voltage may change during the charging process is higher, and in the embodiment, the battery voltage is converted by the voltage stabilizing module 33 so as to stabilize the ELVDD supplied to the display driving chip 32.
In practical applications, the above two situations can be combined, that is, after the charging is started, the control unit 35 controls the third terminal of the switching module 34 to be connected to the first terminal of the switching module 34 according to the charging state. After that, if the display device is separated from the charger, i.e. the charging is stopped, at this time, the control unit 35 acquires the magnitude of the battery voltage, and when the battery voltage is smaller than the preset voltage, the control unit 35 connects the third terminal of the switching module 34 with the second terminal of the switching module 34; and when the battery voltage is greater than or equal to the preset voltage, the control unit 35 controls the third terminal of the switching module 34 to be connected with the first terminal of the switching module 34.
Further, as shown in fig. 4, the switching circuit further includes: a first switch 37 and a second switch 38;
the PMID pin 36 is connected with a VBUS pin of the display device through a first switch 37, and the PMID pin 36 is connected with a VBAT pin of the display device through a second switch 38;
wherein, in case the display device is connected to a charger, the first switch 37 is closed and the second switch 38 is open;
in case the display device is not connected to a charger, the first switch 37 is open and the second switch 38 is closed.
In implementation, the VBUS pin and the VBAT pin are pins in the display device, and the VBUS pin is used for being connected with a charger to take power from an external power source through the charger. And the VBAT pin is connected with a battery in the display equipment, and the VBAT pin directly takes electricity from the battery in the display equipment.
In the case of the display device being connected to the charger, the first switch 37 is closed and the second switch 38 is opened, so that the PMID pin 36 is connected to the VBUS pin and the PMID pin 36 is disconnected from the VBAT pin. At this point, the PMID pin 36 will be drawing power directly from the external power source through the charger, and no longer drawing voltage from the battery of the display device.
In this way, the output power of the battery of the display device during charging can be reduced, thereby reducing battery heating, battery wear, and the like, and delaying the service life of the battery in the display device.
In a second case, the above-mentioned case where the display device is not connected to the charger may include: and the display device is not connected with the charger, and the battery voltage of the display device is greater than or equal to the preset voltage. At this time, the PMID pin 36 will be connected to the ELVDD input terminal of the display driver chip 32 through the voltage regulator module 33 and the switching module 34 in sequence.
Of course, the above case where the display device is not connected to the charger may further include: and the display equipment is not connected with the charger, and the battery voltage of the display equipment is less than the preset voltage. However, at this time, the switching module 34 disconnects the output terminal of the voltage regulator module 33 from the ELVDD input terminal of the display driver chip 32, and therefore, the PMID pin 36 is disconnected from the ELVDD input terminal of the display driver chip 32.
In addition, when the display device is not connected to the charger, the first switch 37 is opened and the second switch 38 is closed, so that the PMID pin 36 is connected to the VBAT pin and the PMID pin 36 is disconnected from the VBUS pin. At this time, the PMID pin 36 takes a voltage from the battery of the display device through the VBAT pin. The PMID pin 36 obtains a voltage from a battery of The display device through The VBAT pin, which is The same as a process of providing power from The electronic device to The external device in The portable (On The Go, OTG) function in The prior art, and is not described herein again.
Thus, it can be ensured that when the display device is not charged, the PMID pin 36 can still get power from the battery through the second switch 38, compared with the scheme in the prior art that the AMOLED driving chip gets power from the battery to provide ELVDD to the display driving chip 32, in this embodiment, the battery voltage obtained by the PMID pin 36 is the ELVDD provided for the display driving chip 32 through the conversion of the voltage stabilizing module 33, and when the battery voltage fluctuates, there is substantially no influence on the output voltage of the voltage stabilizing module 33, thereby avoiding the screen flash problem caused in the mode switching process triggered by the fluctuation of the battery voltage of the AMOLED driving chip.
Optionally, as shown in fig. 4, at least one of the first switch 37 and the second switch 38 is a Metal Oxide Semiconductor (MOS) transistor.
In the embodiment shown in fig. 4, the first switch 37 and the second switch 38 are both MOS transistors, and their control terminals may be connected to a controller in the display device. The controller and the control unit 35 in the embodiment of the present application may be the same control unit, and of course, it may also be two different control units, which are not limited in detail herein.
The working principle and the working flow of the switching circuit provided in the embodiment of the present application are exemplified below by taking the switching circuit shown in fig. 4 as an example, and as shown in fig. 5, the working flow of the switching circuit includes the following steps:
step 501, judging whether a charger is inserted.
The method comprises the following specific steps: whether the display device with the switching circuit provided by the embodiment of the application is in a charging state is detected.
If the determination result of step 501 is yes, step 502 is executed; in the case where the determination result of step 501 is "no", step 503 is executed.
And 502, connecting the third end of the switching module with the first end of the switching module.
In this step, the third terminal of the switching module is disconnected from the second terminal of the switching module, so that the ELVDD of the display driver chip is provided by the voltage regulator module.
Step 503, determining whether the battery voltage reaches a preset voltage.
If the determination result of step 503 is yes, step 502 is executed; if the determination result of step 503 is "no", step 504 is executed.
In the case where the determination result of step 503 is yes, and in the case where the determination result of step 501 is yes, the third terminal of the control switching block is connected to the first terminal of the switching block, but in the case where the actual switching circuit includes the first switch 37 and the second switch 38, the states of the first switch 37 and the second switch 38 are not the same.
Specifically, if the determination result in step 503 is yes, the third terminal of the switching module is controlled to be connected to the first terminal of the switching module, and the second switch 38 is also controlled to be closed, and the first switch 37 is controlled to be opened. At this time, the power supply path of the ELVDD of the display driver chip 32 at this time is: VBAT pin- > second switch 38- > PMID pin 36- > voltage stabilization module 33, and is converted into a voltage that can be used by ELVDD of the display driving chip 32 by the voltage stabilization module 33.
If the determination result in step 501 is yes, the third terminal of the switching module is controlled to be connected to the first terminal of the switching module, and the first switch 37 is also controlled to be closed, and the second switch 38 is controlled to be opened. At this time, the power supply path of the ELVDD of the display driver chip 32 at this time is: VBUS pin- > first switch 37- > PMID pin 36- > voltage stabilization module 33, and is converted into a voltage that can be used by ELVDD of display driving chip 32 by voltage stabilization module 33.
And step 504, controlling the third end of the switching module to be connected with the second end of the switching module.
In this step, the third end of the switching module is disconnected from the first end of the switching module, so that the ELVDD acquired by the display driver chip 32 is the voltage obtained by converting the battery voltage by the AMOLED driver chip 31.
In addition, after step 503, there may be a case where the display device terminates charging, at this time, as the switching circuit in the embodiment of the method shown in fig. 4, the following steps are further performed:
step 505, determine whether to terminate charging.
In this embodiment, the step may be specifically performed to determine whether the charger is pulled out from the charging interface of the display device.
If the determination result of step 505 is yes, step 504 is executed; if the determination result of step 503 is "no", step 502 is executed.
Specifically, when the determination result in the step 503 is "no", the step 502 is executed, and the specific meaning of the step 502 is the same as that when the determination result in the step 503 is "yes", that is, the first switch 37 is further controlled to be opened and the second switch 38 is controlled to be closed in the step 502, which is not described herein again.
In this embodiment of the application, when the control unit determines that the AMOLED driving chip may have mode switching, or the battery voltage is increased, or the battery voltage has large fluctuation, based on the current state of the display device, the third terminal of the switching module and the first terminal of the switching module are controlled, so that before the AMOLED driving chip performs mode switching, the power supply of the ELVDD is switched to the voltage stabilizing module, and the PMID pin provides the stable ELVDD to the display driving chip through the voltage stabilizing module, so as to avoid the phenomenon that the AMOLED driving chip performs mode switching to cause screen flicker of the AMOLED screen, thereby improving the display performance of the AMOLED screen.
Referring to fig. 6, a flowchart of a switching method according to an embodiment of the present application is shown, where the switching method can be applied to the switching circuit shown in fig. 3 or fig. 4, and the switching method can include the following steps:
step 601, obtaining a current state of a display device including the switching circuit, where the current state includes at least one of a charging state, a display state, and a battery voltage state.
Step 602, controlling the third end of the switching module to be connected with the first end of the switching module or controlling the third end of the switching module to be connected with the second end of the switching module according to the current state.
In a specific implementation, the current state may be used as a basis for determining whether a battery of the display device sends a jitter to trigger a mode switching of the AMOLED driving chip, so as to cause a screen flashing phenomenon on the AMOLED screen. For example: in the charging process, the voltage of the battery is increased, so that the mode switching of the AMOLED driving chip is triggered, and if the AMOLED screen is in a lighting state at the moment, the phenomenon of screen flashing of the AMOLED screen is caused; or, under the condition that the AMOLED screen is in the screen-resting state, the phenomenon of screen flashing of the AMOLED screen is determined not to be caused.
At this time, the above controlling the third end of the switching module to be connected to the first end of the switching module or controlling the third end of the switching module to be connected to the second end of the switching module according to the current state may be understood as: controlling the third end of the switching module to be connected with the first end of the switching module only under the condition that the AMOLED screen is judged to be possibly caused to have the screen flickering phenomenon according to the current state; and controlling the third end of the switching module to be connected with the second end of the switching module under the condition that the AMOLED screen is judged not to have the phenomenon of screen flashing according to the current state.
Of course, in a specific implementation, it may also be controlled whether the third terminal of the switching module is connected to the first terminal of the switching module or the second terminal of the switching module according to only whether the AMOLED screen is in the lighting state or the mute state, for example: the third end of the switching module is controlled to be connected with the first end of the switching module as long as the AMOLED screen is in a lighting state.
In addition, the current state may also include other states of the display device, such as: if the audio playing state is turned on, the battery voltage may be jittered, so that the third terminal of the switching module is controlled to be connected with the first terminal of the switching module, and the content of the state included in the current state is not specifically limited.
In implementation, the above specific implementation manner and process for controlling the connection between the third terminal of the switching module and the first terminal of the switching module according to the current state may specifically refer to the circuit implementation shown in fig. 3 or fig. 4: the control unit controls the third end of the switching module to be connected with the first end of the switching module or controls the implementation mode and the process of connecting the third end of the switching module with the second end of the switching module based on the current state of the display device, which are not described herein again.
As an optional implementation manner, the controlling, according to the current state, the third terminal of the switching module to be connected to the first terminal of the switching module, or controlling the third terminal of the switching module to be connected to the second terminal of the switching module includes:
and under the condition that the current state meets at least one of the following conditions, controlling the third end of the switching module to be connected with the first end of the switching module:
the AMOLED screen is in a lighting state, and the display device comprises the AMOLED screen;
the display device is connected with the charger;
the display device is not connected with a charger, and the battery voltage is greater than a preset voltage, and the preset voltage is matched with a mode switching threshold of the AMOLED screen.
In implementation, the state that the AMOLED screen is in a lighting state corresponds to a display state in a current state of the display device, the state that the display device and a charger are in a connection state corresponds to a charging state in the current state of the display device, and the state that the battery voltage is greater than a preset voltage corresponds to a battery voltage state in the current state of the display device.
In practice, when the current state of the display device satisfies any 1 or any 2 of the above-mentioned 3 cases, the steps may be performed: and the third end of the control switching module is connected with the first end of the switching module.
This embodiment can be implemented in a switching circuit as shown in fig. 3 or fig. 4: the control unit controls the connection process of the third end of the switching module and the first end of the switching module to be the same based on the current state of the display device, and the same beneficial effects can be obtained, and the process is not repeated here for avoiding repetition.
As an optional implementation manner, the controlling, according to the current state, the third terminal of the switching module to be connected to the first terminal of the switching module, or controlling the third terminal of the switching module to be connected to the second terminal of the switching module includes:
under the condition that the AMOLED screen is in a lighting state and the display device is connected with the charger, connecting an ELVDD input end of a display driving chip with a VBUS pin of the display device through a voltage stabilizing module and the PMID pin in sequence;
and when the AMOLED screen is in a lighting state, the display device is not connected with a charger, and the battery voltage is greater than or equal to the preset voltage, connecting an ELVDD input end of the display driving chip with a VBAT pin of the display device through the voltage stabilizing module and the PMID pin in sequence.
In this embodiment, as in the switching circuit shown in fig. 4, the process of controlling the on-off states of the first switch and the second switch by the control unit according to the connection condition of the display device and the charger is the same, and the same beneficial effects can be obtained, which is not described herein again.
As an optional implementation manner, the controlling, according to the current state, the third terminal of the switching module to be connected to the first terminal of the switching module, or controlling the third terminal of the switching module to be connected to the second terminal of the switching module includes:
and under the condition that the current state meets at least one of the following conditions, controlling the third end of the switching module to be connected with the second end of the switching module:
the AMOLED screen is in a screen resting state, and the display device comprises the AMOLED screen;
the AMOLED screen is in a lighting state, the display device is not connected with a charger, the battery voltage is smaller than a preset voltage, and the preset voltage is matched with a mode switching threshold of the AMOLED screen.
This embodiment can be implemented in a switching circuit as shown in fig. 3 or fig. 4: the control unit controls the connection process of the third end of the switching module and the second end of the switching module to be the same based on the current state of the display device, and the same beneficial effects can be obtained, and the process is not repeated here for avoiding repetition.
The switching method provided in the embodiment of the present application is applied to the switching circuit provided in the embodiment shown in fig. 3 or fig. 4, and can implement each process in the switching circuit shown in fig. 3 or fig. 4, and has the same beneficial effects as the switching circuit provided in the embodiment shown in fig. 3 or fig. 4, and is not described herein again to avoid repetition.
Optionally, as shown in fig. 7, an embodiment of the present application further provides a display device 700, which includes a processor 701, a memory 702, and a program or an instruction stored in the memory 702 and executable on the processor 701, where the program or the instruction is executed by the processor 701 to implement each process of the embodiment of the switching method shown in fig. 6, and can achieve the same technical effect, and in order to avoid repetition, details are not repeated here.
It should be noted that the electronic devices in the embodiments of the present application include the mobile electronic devices and the non-mobile electronic devices described above.
The embodiment of the present application further provides a readable storage medium, where a program or an instruction is stored on the readable storage medium, and when the program or the instruction is executed by a processor, the process of the embodiment of the handover method shown in fig. 6 is implemented, and the same technical effect can be achieved, and in order to avoid repetition, details are not repeated here.
The processor is the processor in the electronic device described in the above embodiment. The readable storage medium includes a computer readable storage medium, such as a Read-Only Memory (ROM), a Random Access Memory (RAM), a magnetic disk or an optical disk, and so on.
The embodiment of the present application further provides a chip, where the chip includes a processor and a communication interface, the communication interface is coupled to the processor, and the processor is configured to execute a program or an instruction to implement each process of the switching method embodiment shown in fig. 6, and can achieve the same technical effect, and details are not repeated here to avoid repetition.
It should be understood that the chips mentioned in the embodiments of the present application may also be referred to as system-on-chip, system-on-chip or system-on-chip, etc.
It should be noted that, in this document, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising an … …" does not exclude the presence of other like elements in a process, method, article, or apparatus that comprises the element. Further, it should be noted that the scope of the methods and apparatus of the embodiments of the present application is not limited to performing the functions in the order illustrated or discussed, but may include performing the functions in a substantially simultaneous manner or in a reverse order based on the functions involved, e.g., the methods described may be performed in an order different than that described, and various steps may be added, omitted, or combined. In addition, features described with reference to certain examples may be combined in other examples.
Through the above description of the embodiments, those skilled in the art will clearly understand that the method of the above embodiments can be implemented by software plus a necessary general hardware platform, and certainly can also be implemented by hardware, but in many cases, the former is a better implementation manner. Based on such understanding, the technical solutions of the present application may be embodied in the form of a software product, which is stored in a storage medium (such as ROM/RAM, magnetic disk, optical disk) and includes instructions for enabling a terminal (such as a mobile phone, a computer, a server, an air conditioner, or a network device) to execute the method according to the embodiments of the present application.
While the present embodiments have been described with reference to the accompanying drawings, it is to be understood that the invention is not limited to the precise embodiments described above, which are meant to be illustrative and not restrictive, and that various changes may be made therein by those skilled in the art without departing from the spirit and scope of the invention as defined by the appended claims.

Claims (10)

1. A switching circuit for a display device comprising an active matrix organic light emitting diode AMOLED screen, the switching circuit comprising: the device comprises an AMOLED driving chip, a display driving chip, a voltage stabilizing module, a switching module, a control unit and a PMID pin;
the PMID pin is connected with the input end of the voltage stabilizing module;
the control unit is connected to the control end of the switching module, the first end of the switching module is connected to the output end of the voltage stabilizing module, the second end of the switching module is connected to the driving voltage ELVDD power supply end of the AMOLED driving chip, and the third end of the switching module is connected to the ELVDD input end of the display driving chip;
the control unit controls a third end of the switching module to be connected with a first end of the switching module or controls the third end of the switching module to be connected with a second end of the switching module based on a current state of the display device, wherein the current state comprises at least one of a charging state and a battery voltage state;
according to the current state, controlling the third end of the switching module to be connected with the first end of the switching module, or controlling the third end of the switching module to be connected with the second end of the switching module, including:
controlling a third end of the switching module to be connected with a first end of the switching module under the condition that the current state meets at least one of the following conditions;
the AMOLED screen is in a lighting state, and the display device and the charger are in a connection state;
the AMOLED screen is in a lighting state, the display device is not connected with a charger, the voltage of a battery is larger than a preset voltage, and the preset voltage is matched with a mode switching threshold value of the AMOLED screen.
2. The switching circuit of claim 1, further comprising: a first switch and a second switch;
the PMID pin is connected with a VBUS pin of the display equipment through the first switch, and the PMID pin is connected with a VBAT pin of the display equipment through the second switch;
wherein, in case the display device is connected to a charger, the first switch is closed and the second switch is open;
in the case where the display apparatus is not connected to a charger, the first switch is open and the second switch is closed.
3. The switching circuit of claim 2, wherein at least one of the first switch and the second switch is a metal oxide semiconductor field effect transistor (MOS).
4. The switching circuit of claim 1, wherein the voltage regulator module is a low dropout regulator (LDO).
5. The switching circuit according to claim 1, wherein in a case that the display device is not connected to a charger and a battery voltage of the display device is less than a preset voltage, the control unit controls a third terminal of the switching module to be connected to a second terminal of the switching module, and the preset voltage is matched with a mode switching threshold of the AMOLED screen;
and under the condition that the display equipment is connected with the charger, the control unit controls the third end of the switching module to be connected with the first end of the switching module.
6. A switching method applied to the switching circuit according to any one of claims 1 to 5, the switching method comprising:
acquiring a current state of a display device including the switching circuit, the current state including at least one of a charging state and a battery voltage state;
and controlling the third end of the switching module to be connected with the first end of the switching module or controlling the third end of the switching module to be connected with the second end of the switching module according to the current state.
7. The method of claim 6, wherein controlling the third terminal of the switching module to be connected to the first terminal of the switching module or controlling the third terminal of the switching module to be connected to the second terminal of the switching module according to the current state comprises:
under the condition that the AMOLED screen is in a lighting state and the display device is connected with the charger, connecting an ELVDD input end of a display driving chip with a VBUS pin of the display device through a voltage stabilizing module and the PMID pin in sequence;
and when the AMOLED screen is in a lighting state, the display device is not connected with a charger, and the battery voltage is greater than or equal to the preset voltage, connecting an ELVDD input end of the display driving chip with a VBAT pin of the display device through the voltage stabilizing module and the PMID pin in sequence.
8. The method of claim 6, wherein controlling the third terminal of the switching module to be connected to the first terminal of the switching module or controlling the third terminal of the switching module to be connected to the second terminal of the switching module according to the current state comprises:
and under the condition that the current state meets at least one of the following conditions, controlling the third end of the switching module to be connected with the second end of the switching module:
the AMOLED screen is in a screen resting state, and the display device comprises the AMOLED screen;
the AMOLED screen is in a lighting state, the display device is not connected with a charger, the battery voltage is smaller than a preset voltage, and the preset voltage is matched with a mode switching threshold of the AMOLED screen.
9. A display device comprising a processor, a memory and a program or instructions stored on the memory and executable on the processor, the program or instructions when executed by the processor implementing the steps of the switching method according to any one of claims 6 to 8.
10. A readable storage medium, characterized in that it stores thereon a program or instructions which, when executed by a processor, implement the steps of the handover method according to any one of claims 6 to 8.
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