CN113707068B - Display panel power supply circuit, power supply method and display device - Google Patents
Display panel power supply circuit, power supply method and display device Download PDFInfo
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- CN113707068B CN113707068B CN202110990957.5A CN202110990957A CN113707068B CN 113707068 B CN113707068 B CN 113707068B CN 202110990957 A CN202110990957 A CN 202110990957A CN 113707068 B CN113707068 B CN 113707068B
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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
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Abstract
Disclosed herein is a display panel power supply circuit including: the panel driving module, the power management module, the first switching device and the second switching device; the first switching device is configured to conduct a current path between a first power supply port of the panel driving module and a first power supply terminal of the display panel in a second display mode stage and a stage of switching the second display mode to the first display mode, and to disconnect the current path between the first power supply port and the first power supply terminal in the first display mode stage and the stage of switching the first display mode to the second display mode; the second switching device is configured to conduct a current path between the second power supply port of the power supply management module and the first power supply end in a first display mode stage and a stage of switching the first display mode to the second display mode; and opening a current path between the second power supply port and the first power supply port in the second display mode stage and the stage of switching the second display mode to the first display mode. The solution herein can improve screen flicker upon mode switching.
Description
Technical Field
The embodiment of the application relates to the technical field of display, in particular to a power supply circuit, a power supply method and a display device of a display panel.
Background
Low power consumption has been an important measure for product performance in the display industry (especially in mobile phones and wearable devices, etc.), and thus a technology for powering a display Panel (Panel) using different power supplies in different display modes has been introduced.
In the related art, a Driver IC (Driver chip) and a PMIC (power management chip) are used as dual power sources to supply power to a display panel, a negative power source end of the power management chip and a negative power source end of the Driver chip are connected together, and a positive power source end of the display panel, a positive power source end of the power management chip and a positive power source end of the Driver chip are connected together.
When the display mode is switched, crosstalk occurs between power signals of the power management chip and the driving chip, so that larger ripples appear on voltages of a positive power end and a negative power end of the panel, and screen flicker is caused.
Disclosure of Invention
The embodiment of the application provides a display panel power supply circuit, which comprises: the panel driving module, the power management module, the first switching device and the second switching device;
the panel driving module is configured to control the opening and closing of a first power port of the panel driving module and a second power port of the power management module according to a display mode: the method comprises the steps of controlling a first power port to be closed and a second power port to be opened in a first display mode stage, controlling the first power port to be opened and the second power port to be closed in a second display mode stage, and controlling the first power port and the second power port to be opened in a mode switching stage;
The first switching device is connected between a first power supply end of the display panel and a first power supply end of the panel driving module, and is configured to conduct a current path between the first power supply end and the first power supply end of the display panel in a second display mode stage and a stage of switching the second display mode to the first display mode; disconnecting a current path between the first power supply port and a first power supply end of the display panel in a first display mode stage and a stage of switching from a first display mode to a second display mode;
the second switching device is connected between a first power supply end of the display panel and a second power supply end of the power supply management module, and is configured to conduct a current path between the second power supply end and the first power supply end of the display panel in a first display mode stage and a stage of switching from the first display mode to the second display mode; and disconnecting a current path between the second power supply port and the first power supply port of the display panel in a second display mode stage and a stage of switching the second display mode to the first display mode.
The embodiment of the application provides a power supply method of a display panel, which comprises the following steps:
Determining a display mode of the display panel;
and controlling the opening and closing of the first power port of the panel driving module and the second power port of the power management module according to the display mode: the method comprises the steps of controlling a first power port to be closed and a second power port to be opened in a first display mode stage, controlling the first power port to be opened and the second power port to be closed in a second display mode stage, and controlling the first power port and the second power port to be opened in a mode switching stage; controlling a first switching device to conduct a current path between the first power supply port and the first power supply end of the display panel in a second display mode stage and a stage of switching the second display mode to the first display mode, and disconnecting the current path between the first power supply port and the first power supply end of the display panel in the first display mode stage and the stage of switching the first display mode to the second display mode; controlling a second switching device to conduct a current path between the second power supply port and the first power supply end of the display panel in a first display mode stage and a stage of switching the first display mode to a second display mode, and disconnecting the current path between the second power supply port and the first power supply end of the display panel in the second display mode stage and the stage of switching the second display mode to the first display mode; the first switching device is connected between a first power supply end of the display panel and a first power supply end of the panel driving module; the second switching device is connected between the first power supply end of the display panel and the second power supply end of the power supply management module.
An embodiment of the present application provides a display device including: the display panel power supply circuit.
According to the display panel power supply circuit provided by the embodiment of the application, the first switching device is connected between the first power end of the display panel and the first power port of the panel driving module, the second switching device is connected between the first power end of the display panel and the second power port of the power management module, and the first switching device is used for disconnecting the current path between the first power port and the first power end of the display panel in the stage of switching the first display mode to the second display mode, so that the signal of the first power end of the display panel can be prevented from being interfered in the process that the voltage value of the first power port is changed from the initial voltage value to the target voltage value. In the stage of switching the second display mode to the first display mode, the second switching device is used for switching off the current path between the second power supply port and the first power supply port of the display panel, so that interference on the signal of the first power supply port of the display panel in the process that the voltage value of the second power supply port is changed from the initial voltage value to the target voltage value can be avoided. The display panel power supply circuit provided by the embodiment of the application can avoid signal fluctuation of the power supply end of the display panel caused by switching the display mode, and improve screen flicker during switching the mode.
Other aspects will become apparent upon reading and understanding the accompanying drawings and detailed description.
Drawings
The accompanying drawings are included to provide an understanding of the principles of the application, and are incorporated in and constitute a part of this specification, illustrate embodiments of the application and together with the description serve to explain, without limitation, the principles of the application.
Fig. 1 is a schematic structural diagram of a power supply circuit of a display panel according to an embodiment of the application;
fig. 2 is a schematic structural diagram of another power supply circuit for a display panel according to an embodiment of the present application (the first switching device and the second switching device are diodes);
fig. 3 is a schematic structural diagram of another power supply circuit for a display panel according to an embodiment of the present application (the first switching device and the second switching device are transistors);
fig. 4 is a schematic structural diagram of another power supply circuit for a display panel according to an embodiment of the present application (further including a third switching device and a fourth switching device);
fig. 5 is a schematic structural diagram of another power supply circuit for a display panel according to an embodiment of the present application (the third switching device and the fourth switching device are transistors);
fig. 6 is a schematic structural diagram of another power supply circuit for a display panel according to an embodiment of the present application (the first switching device and the second switching device are diodes, and the third switching device and the fourth switching device are transistors);
Fig. 7 is a schematic structural diagram of another power supply circuit for a display panel according to an embodiment of the present application (the first switching device, the second switching device, the third switching device, and the fourth switching device are transistors);
fig. 8 is a schematic diagram of voltage variation of a power supply circuit of a display panel according to an embodiment of the present application (the first switching device and the second switching device are diodes, and the first power supply terminal of the display panel is a negative power supply terminal);
fig. 9 is a schematic diagram of voltage variation of a power supply circuit of a display panel according to an embodiment of the present application (the first switching device and the second switching device are transistors, and the first power supply terminal of the display panel is a negative power supply terminal);
fig. 10 is a schematic diagram of voltage variation of a power supply circuit of a display panel according to an embodiment of the present application (the first switching device and the second switching device are transistors, and the first power supply terminal of the display panel is a positive power supply terminal);
fig. 11 is a flowchart of a power supply method for a display panel according to an embodiment of the application.
Detailed Description
The present application has been described in terms of several embodiments, but the description is illustrative and not restrictive, and it will be apparent to those of ordinary skill in the art that many more embodiments and implementations are possible within the scope of the described embodiments. Although many possible combinations of features are shown in the drawings and discussed in the detailed description, many other combinations of the disclosed features are possible. Any feature or element of any embodiment may be used in combination with or in place of any other feature or element of any other embodiment unless specifically limited.
The present application includes and contemplates combinations of features and elements known to those of ordinary skill in the art. The disclosed embodiments, features and elements of the present application may also be combined with any conventional features or elements to form a unique inventive arrangement as defined in the appended claims. Any feature or element of any embodiment may also be combined with features or elements from other inventive arrangements to form another unique inventive arrangement as defined in the appended claims. It is therefore to be understood that any of the features shown and/or discussed in the present application may be implemented alone or in any suitable combination. Accordingly, the embodiments are not to be restricted except in light of the attached claims and their equivalents. Further, various modifications and changes may be made within the scope of the appended claims.
The ordinal numbers of "first", "second", "third", etc. in the present specification are provided to avoid mixing of constituent elements, and are not intended to be limited in number.
In this specification, the terms "mounted," "connected," and "connected" are to be construed broadly, unless explicitly stated or limited otherwise. For example, it may be a fixed connection, a removable connection, or an integral connection; may be a mechanical connection, or an electrical connection; may be directly connected, or indirectly connected through intermediate members, or may be in communication with the interior of two elements. The specific meaning of the terms in this disclosure will be understood by those of ordinary skill in the art in the specific context.
As shown in fig. 1, an embodiment of the present application provides a power supply circuit for a display panel, including: a panel driving module 1, a power management module 2, a first switching device 31, and a second switching device 32;
the panel driving module is configured to control the on and off of the first power port P1 of the panel driving module and the second power port P2 of the power management module according to the display mode: the method comprises the steps of controlling a first power port to be closed and a second power port to be opened in a first display mode stage, controlling the first power port to be opened and the second power port to be closed in a second display mode stage, and controlling the first power port and the second power port to be opened in a mode switching stage;
the first switching device is connected between a first power supply terminal V1 of the display panel and a first power supply terminal of the panel driving module, and is configured to conduct a current path between the first power supply terminal and the first power supply terminal of the display panel in a second display mode stage and a stage of switching the second display mode to the first display mode; disconnecting a current path between the first power supply port and a first power supply end of the display panel in a first display mode stage and a stage of switching from a first display mode to a second display mode;
The second switching device is connected between a first power supply end of the display panel and a second power supply end of the power supply management module, and is configured to conduct a current path between the second power supply end and the first power supply end of the display panel in a first display mode stage and a stage of switching from the first display mode to the second display mode; and disconnecting a current path between the second power supply port and the first power supply port of the display panel in a second display mode stage and a stage of switching the second display mode to the first display mode.
The display panel power supply circuit provided by the embodiment is characterized in that the first switching device is connected between the first power end of the display panel and the first power port of the panel driving module, the second switching device is connected between the first power end of the display panel and the second power port of the power management module, and the first switching device is used for disconnecting the current path between the first power port and the first power end of the display panel in the stage of switching the first display mode to the second display mode, so that the signal of the first power end of the display panel can be prevented from being interfered in the process that the voltage value of the first power port is changed from the initial voltage value to the target voltage value. In the stage of switching the second display mode to the first display mode, the second switching device is used for switching off the current path between the second power supply port and the first power supply port of the display panel, so that interference on the signal of the first power supply port of the display panel in the process that the voltage value of the second power supply port is changed from the initial voltage value to the target voltage value can be avoided. The display panel power supply circuit provided by the embodiment can avoid signal fluctuation of the power supply end of the display panel caused by switching of the display modes, and improve screen flicker during switching of the modes.
In an embodiment of the present disclosure, the panel driving module may include a plurality of ports (ports) capable of providing various driving signals (including power signals) to the display panel. The power management module may include a plurality of ports capable of providing various power signals to the panel driving module and the display panel. The panel driving module may be a Driver IC (Driver chip), and the power management module may be a PMIC (power management chip).
In some exemplary embodiments, the voltage value of the first power supply port of the panel driving module is changed from an initial voltage value to a first target voltage value at a stage of switching the first display mode to the second display mode;
in the stage of switching the second display mode to the first display mode, the voltage value of the second power supply port of the power supply management module is changed from the initial voltage value to the first target voltage value.
In some exemplary embodiments, when the first power supply terminal of the display panel is a negative power supply terminal, the first target voltage value is a negative voltage, and the initial voltage value is greater than the first target voltage value; when the first power supply end of the display panel is a positive power supply end, the first target voltage value is a positive voltage, and the initial voltage value is smaller than the first target voltage value.
In some exemplary embodiments, the display panel is powered by the power management module during a first display mode phase and a phase of switching the first display mode to the second display mode; and in the stage of the second display mode and the stage of switching the second display mode to the first display mode, the display panel is powered by the panel driving module.
In some exemplary embodiments, the second display mode has a lower power consumption than the first display mode.
In some exemplary embodiments, as shown in fig. 2, the first switching device includes: a first diode D1; the anode of the first diode is connected with a first power supply end V1 of the display panel, and the cathode of the first diode is connected with a first power supply end P1 of the panel driving module;
the second switching device includes: a second diode D2; the anode of the second diode is connected with the first power supply end V1 of the display panel, and the cathode of the second diode is connected with the second power supply port P2 of the power supply management module;
the first power supply end of the display panel is a negative power supply end.
In some exemplary embodiments, as shown in fig. 3, the first switching device includes: a first transistor M1; the control electrode of the first transistor is connected with a first control signal S1, the first electrode of the first transistor is connected with a first power supply end V1 of the display panel, and the second electrode of the first transistor is connected with a first power supply end P1 of the panel driving module;
The second switching device includes: a second transistor M2; the control electrode of the second transistor is connected with the second control signal S2, the first electrode of the second transistor is connected with the first power end V1 of the display panel, and the second electrode of the second transistor is connected with the second power end P2 of the power management module.
In some exemplary embodiments, the first and second control signals are output signals of the panel driving module.
In some exemplary embodiments, as shown in fig. 4, the display panel power supply circuit further includes: a third switching device 33 and a fourth switching device 34;
the panel driving module is further configured to control the opening and closing of the third power port P3 of the panel driving module and the fourth power port P4 of the power management module according to the display mode: the third power port and the fourth power port are controlled to be turned off and turned on in the first display mode stage, the third power port and the fourth power port are controlled to be turned on and turned off in the second display mode stage, and the third power port and the fourth power port are controlled to be turned on in the mode switching stage;
the third switching device is connected between a second power supply terminal V2 of the display panel and a third power supply terminal of the panel driving module, and is configured to conduct a current path between the third power supply terminal and the second power supply terminal of the display panel in a second display mode stage and a stage of switching the second display mode to the first display mode; disconnecting a current path between the third power supply port and a second power supply port of the display panel in a first display mode stage and a stage of switching the first display mode to a second display mode;
The fourth switching device is connected between the second power supply end of the display panel and the fourth power supply port of the power supply management module, and is configured to conduct a current path between the fourth power supply port and the second power supply end of the display panel in a first display mode stage and a stage of switching from the first display mode to the second display mode; and disconnecting a current path between the fourth power supply port and the second power supply end of the display panel in a second display mode stage and a stage of switching the second display mode to the first display mode.
In some exemplary embodiments, the first power supply terminal of the display panel is a negative power supply terminal and the second power supply terminal of the display panel is a positive power supply terminal.
In some exemplary embodiments, as shown in fig. 5, the third switching device includes: a third transistor M3; the control electrode of the third transistor is connected with a third control signal S3, the first electrode of the third transistor is connected with a second power supply end V2 of the display panel, and the second electrode of the third transistor is connected with a third power supply port P3 of the panel driving module;
the fourth switching device includes: a fourth transistor M4; the control electrode of the fourth transistor is connected with the fourth control signal S4, the first electrode of the fourth transistor is connected with the second power supply end V2 of the display panel, and the second electrode of the fourth transistor is connected with the fourth power supply port P4 of the power supply management module.
In some exemplary embodiments, the third and fourth control signals are output signals of the panel driving module.
In some exemplary embodiments, as shown in fig. 6, the first switching device includes: a first diode D1; the anode of the first diode is connected with a first power supply end V1 of the display panel, and the cathode of the first diode is connected with a first power supply end P1 of the panel driving module;
the second switching device includes: a second diode D2; the anode of the second diode is connected with the first power supply end V1 of the display panel, and the cathode of the second diode is connected with the second power supply port P2 of the power supply management module;
the third switching device includes: a third transistor M3; the control electrode of the third transistor is connected with a third control signal S3, the first electrode of the third transistor is connected with a second power supply end V2 of the display panel, and the second electrode of the third transistor is connected with a third power supply port P3 of the panel driving module;
the fourth switching device includes: a fourth transistor M4; the control electrode of the fourth transistor is connected with a fourth control signal S4, the first electrode of the fourth transistor is connected with a second power supply end V2 of the display panel, and the second electrode of the fourth transistor is connected with a fourth power supply port P4 of the power supply management module;
The first power supply terminal of the display panel is a negative power supply terminal.
In some exemplary embodiments, as shown in fig. 7, the first switching device includes: a first transistor M1; the control electrode of the first transistor is connected with a first control signal S1, the first electrode of the first transistor is connected with a first power supply end V1 of the display panel, and the second electrode of the first transistor is connected with a first power supply end P1 of the panel driving module;
the second switching device includes: a second transistor M2; the control electrode of the second transistor is connected with a second control signal S2, the first electrode of the second transistor is connected with a first power supply end V1 of the display panel, and the second electrode of the second transistor is connected with a second power supply port P2 of the power supply management module;
the third switching device includes: a third transistor M3; the control electrode of the third transistor is connected with a third control signal S3, the first electrode of the third transistor is connected with a second power supply end V2 of the display panel, and the second electrode of the third transistor is connected with a third power supply port P3 of the panel driving module;
the fourth switching device includes: a fourth transistor M4; the control electrode of the fourth transistor is connected with the fourth control signal S4, the first electrode of the fourth transistor is connected with the second power supply end V2 of the display panel, and the second electrode of the fourth transistor is connected with the fourth power supply port P4 of the power supply management module.
In the presently disclosed embodiments, one of the source and drain of the transistor is referred to as a first pole and the other is referred to as a second pole. When the source and drain of the transistor are symmetrical, the source and drain of the transistor may be interchanged.
The first, second, third, and fourth transistors may be metal-oxide semiconductor field effect transistors (MOSFETs).
The power supply circuit of the display panel adopts the structure shown in fig. 2, the first switching device and the second switching device are diodes, and the first power supply end of the display panel is a negative power supply end. The initial voltage value of the first power supply port and the second power supply port at the starting moment is b, the first target voltage value of the first power supply port and the second power supply port when the voltage reaches a stable state after the first power supply port and the second power supply port are started is a (a is smaller than 0), and b is larger than a. Fig. 8 shows voltage value changes of the first power supply terminal V1 of the display panel, the first power supply terminal P1 of the panel driving module, and the second power supply terminal P2 of the power management module in each of the display mode stage and the display mode switching stage.
(1) A phase (T1 phase) for switching the first display mode to the second display mode
At time t1, the display mode starts to switch from the first display mode to the second display mode, the first power supply port of the panel driving module is started, the voltage value of the first power supply port starts to decline from the initial voltage value, the second power supply port of the power supply management module continues to keep in an on state, and in the process that the voltage value of the first power supply port declines from the initial voltage value to the first target voltage value, the first diode is in an off state, and the second diode is in an on state, so that the voltage value of the first power supply port cannot influence the voltage value of the first power supply port of the display panel, the voltage value of the first power supply port keeps unchanged, and the voltage value of the second power supply port of the power supply management module keeps unchanged. And the first display mode is switched to the second display mode, and the power supply management module continues to supply power to the display panel.
(2) Second display mode phase (T2 phase)
At time t2, the second power port of the power management module is turned off. After time t2, the display mode is a second display mode, the first power port of the panel driving module is in an on state, the first diode is switched to an on state, the second diode is switched to an off state, the voltage value of the first power port is a first target voltage value, the voltage value of the first power port of the display panel is the first target voltage value (forward conduction voltage drop of the first diode is ignored), and the voltage value of the second power port of the power management module is increased from the first target voltage value to an initial voltage value and kept at the initial voltage value. And a second display mode stage, wherein the panel driving module supplies power to the display panel.
(3) Second display mode to first display mode switching stage (T3 stage)
At time t3, the display mode starts to switch from the second display mode to the first display mode, the second power port of the power management module is started, the voltage value of the second power port starts to decline from the initial voltage value, the first power port of the panel driving module continues to keep in an on state, and in the process that the voltage value of the second power port declines from the initial voltage value to the first target voltage value, the first diode is in an on state because the second diode is in an off state, so that the voltage value of the second power port cannot influence the voltage value of the first power port of the display panel, the voltage value of the first power port keeps unchanged, and the voltage value of the first power port of the panel driving module keeps unchanged. And the second display mode is used for supplying power to the display panel by the panel driving module in the first display mode switching stage.
(4) First display mode phase (T4 phase)
At time t4, the first power port of the panel driving module is turned off. After time t4, the display mode is a first display mode, the second power port of the power management module is in an on state, the second diode is switched to an on state, the first diode is switched to an off state, the voltage value of the second power port is a first target voltage value, the voltage value of the first power port of the display panel is the first target voltage value (the forward conduction voltage drop of the second diode is ignored), and the voltage value of the first power port of the panel driving module is increased from the first target voltage value to an initial voltage value and kept at the initial voltage value. When the display mode is the first display mode, the display panel is powered by the power management module.
The power supply circuit of the display panel adopts the structure shown in fig. 3, the first switching device and the second switching device are transistors, the first switching device and the second switching device are assumed to be N-type transistors, the control electrode of the N-type transistors enables the transistors to be on under a high-level control signal, the control electrode of the N-type transistors enables the transistors to be off under a low-level control signal, and the first power supply end of the display panel is a negative power supply end. The initial voltage value of the first power supply port and the second power supply port at the starting moment is b, the first target voltage value of the first power supply port and the second power supply port when the voltage reaches a stable state after the first power supply port and the second power supply port are started is a (a is smaller than 0), and b is larger than a. Fig. 9 shows voltage value changes of the first power source terminal V1 of the display panel, the first power source terminal P1 of the panel driving module, the second power source terminal P2 of the power management module, the first control signal S1 and the second control signal S2 in each display mode stage and display mode switching stage.
(1) A phase (T1 phase) for switching the first display mode to the second display mode
At time t1, the display mode starts to switch from the first display mode to the second display mode, the first power supply port of the panel driving module is started, the voltage value of the first power supply port starts to decrease from the initial voltage value, the second power supply port of the power supply management module continues to keep in an on state, the first control signal is low level in the process that the voltage value of the first power supply port decreases from the initial voltage value to the first target voltage value, the second control signal is high level, and the second transistor is in an on state because the first transistor is in an off state, so that the voltage value of the first power supply port does not influence the voltage value of the first power supply port of the display panel, the voltage value of the first power supply port keeps unchanged, and the voltage value of the second power supply port of the power supply management module keeps unchanged. And the first display mode is switched to the second display mode, and the power supply management module continues to supply power to the display panel.
(2) Second display mode phase (T2 phase)
At time t2, the second power port of the power management module is turned off, the first control signal is switched to a high level, and the second control signal is switched to a low level. After time t2, the display mode is a second display mode, the first power supply port of the panel driving module is in an on state, the first transistor is switched to an on state, the second transistor is switched to an off state, the voltage value of the first power supply port is a first target voltage value, the voltage value of the first power supply port of the display panel is the first target voltage value, and the voltage value of the second power supply port of the power supply management module is increased from the first target voltage value to an initial voltage value and kept at the initial voltage value. And a second display mode stage, wherein the panel driving module supplies power to the display panel.
(3) Second display mode to first display mode switching stage (T3 stage)
At time t3, the display mode starts to switch from the second display mode to the first display mode, the second power port of the power management module is turned on, the first control signal is kept at a high level, the second control signal is kept at a low level, the first transistor is kept in an on state, the voltage value of the second power port starts to decrease from an initial voltage value, the first power port of the panel driving module continues to be kept in an on state, and in the process that the voltage value of the second power port decreases from the initial voltage value to a first target voltage value, the voltage value of the first power port of the panel driving module keeps unchanged because the second transistor is in an off state, the voltage value of the second power port does not influence the voltage value of the first power port of the display panel. And the second display mode is used for supplying power to the display panel by the panel driving module in the first display mode switching stage.
(4) First display mode phase (T4 phase)
At time t4, the first power port of the panel driving module is turned off, the first control signal is switched to a low level, and the second control signal is switched to a high level. After time t4, the display mode is a first display mode, the second power port of the power management module is in an on state, the second transistor is switched to an on state, the first transistor is switched to an off state, the voltage value of the second power port is a first target voltage value, the voltage value of the first power port of the display panel is the first target voltage value, and the voltage value of the first power port of the panel driving module is increased from the first target voltage value to an initial voltage value and kept at the initial voltage value. When the display mode is the first display mode, the display panel is powered by the power management module.
The power supply circuit of the display panel adopts the structure shown in fig. 3, the first switching device and the second switching device are transistors, the first switching device and the second switching device are assumed to be N-type transistors, the control electrode of the N-type transistors enables the transistors to be on under a high-level control signal, the control electrode of the N-type transistors enables the transistors to be off under a low-level control signal, and the first power end of the display panel is a positive power end. The initial voltage value of the first power supply port and the second power supply port at the starting moment is b, the first target voltage value of the first power supply port and the second power supply port when the voltage reaches a stable state after the first power supply port and the second power supply port are started is a (a is larger than 0), and b is smaller than a. Fig. 10 shows voltage value changes of the first power source terminal V1 of the display panel, the first power source terminal P1 of the panel driving module, the second power source terminal P2 of the power management module, the first control signal S1 and the second control signal S2 in each display mode stage and display mode switching stage.
(1) A phase (T1 phase) for switching the first display mode to the second display mode
At time t1, the display mode starts to switch from the first display mode to the second display mode, the first power supply port of the panel driving module is started, the voltage value of the first power supply port starts to rise from the initial voltage value, the second power supply port of the power supply management module continues to keep in an on state, the first control signal is low level in the process that the voltage value of the first power supply port rises from the initial voltage value to the first target voltage value, the second control signal is high level, and the second transistor is in an on state because the first transistor is in an off state, so that the voltage value of the first power supply port does not influence the voltage value of the first power supply port of the display panel, the voltage value of the first power supply port keeps unchanged, and the voltage value of the second power supply port of the power supply management module keeps unchanged. And the first display mode is switched to the second display mode, and the power supply management module continues to supply power to the display panel.
(2) Second display mode phase (T2 phase)
At time t2, the second power port of the power management module is turned off, the first control signal is switched to a high level, and the second control signal is switched to a low level. After time t2, the display mode is a second display mode, the first power supply port of the panel driving module is in an on state, the first transistor is switched to an on state, the second transistor is switched to an off state, the voltage value of the first power supply port is a first target voltage value, the voltage value of the first power supply port of the display panel is the first target voltage value, and the voltage value of the second power supply port of the power supply management module is reduced from the first target voltage value to an initial voltage value and kept at the initial voltage value. And a second display mode stage, wherein the panel driving module supplies power to the display panel.
(3) Second display mode to first display mode switching stage (T3 stage)
At time t3, the display mode starts to switch from the second display mode to the first display mode, the second power port of the power management module is turned on, the first control signal is kept at a high level, the second control signal is kept at a low level, the first transistor is kept in an on state, the voltage value of the second power port starts to rise from an initial voltage value, the first power port of the panel driving module continues to be kept in an on state, and in the process that the voltage value of the second power port rises from the initial voltage value to a first target voltage value, the voltage value of the first power port of the panel driving module keeps unchanged because the second transistor is in an off state, the voltage value of the second power port does not influence the voltage value of the first power port of the display panel. And the second display mode is used for supplying power to the display panel by the panel driving module in the first display mode switching stage.
(4) First display mode phase (T4 phase)
At time t4, the first power port of the panel driving module is turned off, the first control signal is switched to a low level, and the second control signal is switched to a high level. After time t4, the display mode is a first display mode, the second power port of the power management module is in an on state, the second transistor is switched to an on state, the first transistor is switched to an off state, the voltage value of the second power port is a first target voltage value, the voltage value of the first power port of the display panel is the first target voltage value, and the voltage value of the first power port of the panel driving module is reduced from the first target voltage value to an initial voltage value and kept at the initial voltage value. When the display mode is the first display mode, the display panel is powered by the power management module.
As shown in fig. 11, an embodiment of the present application provides a power supply method for a display panel, including the following steps:
step S10, determining a display mode of a display panel;
step S20, controlling the opening and closing of the first power port of the panel driving module and the second power port of the power management module according to the display mode: the method comprises the steps of controlling a first power port to be closed and a second power port to be opened in a first display mode stage, controlling the first power port to be opened and the second power port to be closed in a second display mode stage, and controlling the first power port and the second power port to be opened in a mode switching stage; controlling a first switching device to conduct a current path between the first power supply port and the first power supply end of the display panel in a second display mode stage and a stage of switching the second display mode to the first display mode, and disconnecting the current path between the first power supply port and the first power supply end of the display panel in the first display mode stage and the stage of switching the first display mode to the second display mode; controlling a second switching device to conduct a current path between the second power supply port and the first power supply end of the display panel in a first display mode stage and a stage of switching the first display mode to a second display mode, and disconnecting the current path between the second power supply port and the first power supply end of the display panel in the second display mode stage and the stage of switching the second display mode to the first display mode; the first switching device is connected between a first power supply end of the display panel and a first power supply end of the panel driving module; the second switching device is connected between the first power supply end of the display panel and the second power supply end of the power supply management module.
According to the display panel power supply method, in the stage of switching from the first display mode to the second display mode, the first switching device is used for switching off the current path between the first power port and the first power port of the display panel, so that interference on signals of the first power port of the display panel in the process that the voltage value of the first power port is changed from the initial voltage value to the target voltage value can be avoided. In the stage of switching the second display mode to the first display mode, the second switching device is used for switching off the current path between the second power supply port and the first power supply port of the display panel, so that interference on the signal of the first power supply port of the display panel in the process that the voltage value of the second power supply port is changed from the initial voltage value to the target voltage value can be avoided. The power supply method of the display panel can avoid signal fluctuation of the power supply end of the display panel caused by switching of the display modes, and improve screen flicker during switching of the modes.
In some exemplary embodiments, the voltage value of the first power supply port of the panel driving module is changed from an initial voltage value to a first target voltage value at a stage of switching the first display mode to the second display mode;
In the stage of switching the second display mode to the first display mode, the voltage value of the second power supply port of the power supply management module is changed from the initial voltage value to the first target voltage value.
In some exemplary embodiments, when the first power supply terminal of the display panel is a negative power supply terminal, the first target voltage value is a negative voltage, and the initial voltage value is greater than the first target voltage value; when the first power supply end of the display panel is a positive power supply end, the first target voltage value is a positive voltage, and the initial voltage value is smaller than the first target voltage value.
In some exemplary embodiments, the second display mode has a lower power consumption than the first display mode.
In some exemplary embodiments, the method further comprises:
and controlling the opening and closing of the third power port of the panel driving module and the fourth power port of the power management module according to the display mode: the third power port and the fourth power port are controlled to be turned off and turned on in the first display mode stage, the third power port and the fourth power port are controlled to be turned on and turned off in the second display mode stage, and the third power port and the fourth power port are controlled to be turned on in the mode switching stage; controlling a third switching device to conduct a current path between the third power supply port and the second power supply end of the display panel in a second display mode stage and a stage of switching the second display mode to a first display mode, and disconnecting the current path between the third power supply port and the second power supply end of the display panel in the first display mode stage and the stage of switching the first display mode to the second display mode; controlling a fourth switching device to conduct a current path between the fourth power supply port and a second power supply end of the display panel in a first display mode stage and a stage of switching a first display mode to a second display mode, and disconnecting the current path between the fourth power supply port and the second power supply end of the display panel in the second display mode stage and the stage of switching the second display mode to the first display mode; the third switching device is connected between the second power supply end of the display panel and the third power supply end of the panel driving module; the fourth switching device is connected between the second power end of the display panel and the fourth power port of the power management module.
The embodiment of the application also provides a display device which comprises the display panel power supply circuit.
The display device may be: any product or component with display function such as a mobile phone, a tablet computer, a wearable device, a television, a display, a notebook computer, a digital photo frame, a navigator and the like. Other essential components of the display device will be understood by those skilled in the art, and are not described herein in detail, nor should they be considered as limiting the application.
While the embodiments disclosed in the present disclosure are described above, the embodiments are only employed for facilitating understanding of the present disclosure, and are not intended to limit the present disclosure. Any person skilled in the art to which this disclosure pertains will appreciate that numerous modifications and changes in form and details can be made without departing from the spirit and scope of the disclosure, but the scope of the disclosure is to be determined by the appended claims.
Claims (15)
1. A display panel power supply circuit, comprising: the panel driving module, the power management module, the first switching device and the second switching device;
the panel driving module is configured to control the opening and closing of a first power port of the panel driving module and a second power port of the power management module according to a display mode: the method comprises the steps of controlling a first power port to be closed and a second power port to be opened in a first display mode stage, controlling the first power port to be opened and the second power port to be closed in a second display mode stage, and controlling the first power port and the second power port to be opened in a mode switching stage;
The first switching device is connected between a first power supply end of the display panel and a first power supply end of the panel driving module, and is configured to conduct a current path between the first power supply end and the first power supply end of the display panel in a second display mode stage and a stage of switching the second display mode to the first display mode; disconnecting a current path between the first power supply port and a first power supply end of the display panel in a first display mode stage and a stage of switching from a first display mode to a second display mode;
the second switching device is connected between a first power supply end of the display panel and a second power supply end of the power supply management module, and is configured to conduct a current path between the second power supply end and the first power supply end of the display panel in a first display mode stage and a stage of switching from the first display mode to the second display mode; and disconnecting a current path between the second power supply port and the first power supply port of the display panel in a second display mode stage and a stage of switching the second display mode to the first display mode.
2. The display panel power supply circuit of claim 1, wherein:
In a stage of switching the first display mode to the second display mode, changing a voltage value of a first power supply port of the panel driving module from an initial voltage value to a first target voltage value;
in the stage of switching the second display mode to the first display mode, the voltage value of the second power supply port of the power supply management module is changed from the initial voltage value to the first target voltage value.
3. The display panel power supply circuit of claim 2, wherein:
when the first power supply end of the display panel is a negative power supply end, the first target voltage value is a negative voltage, and the initial voltage value is larger than the first target voltage value; when the first power supply end of the display panel is a positive power supply end, the first target voltage value is a positive voltage, and the initial voltage value is smaller than the first target voltage value.
4. The display panel power supply circuit of claim 1, wherein:
the second display mode has a lower power consumption than the first display mode.
5. The display panel power supply circuit of claim 1, wherein:
the first switching device includes: a first diode; the anode of the first diode is connected with a first power supply end of the display panel, and the cathode of the first diode is connected with a first power supply end of the panel driving module;
The second switching device includes: a second diode; the anode of the second diode is connected with the first power end of the display panel, and the cathode of the second diode is connected with the second power end of the power management module;
the first power supply end of the display panel is a negative power supply end.
6. The display panel power supply circuit of claim 1, wherein:
the first switching device includes: a first transistor; the control electrode of the first transistor is connected with a first control signal, the first electrode of the first transistor is connected with a first power supply end of the display panel, and the second electrode of the first transistor is connected with a first power supply end of the panel driving module;
the second switching device includes: a second transistor; the control electrode of the second transistor is connected with a second control signal, the first electrode of the second transistor is connected with the first power end of the display panel, and the second electrode of the second transistor is connected with the second power end of the power management module.
7. The display panel power supply circuit of claim 6, wherein:
the first and second control signals are output signals of the panel driving module.
8. The display panel power supply circuit of claim 1, wherein:
The display panel power supply circuit further includes: a third switching device and a fourth switching device;
the panel driving module is further configured to control on and off of a third power port of the panel driving module and a fourth power port of the power management module according to a display mode: the third power port and the fourth power port are controlled to be turned off and turned on in the first display mode stage, the third power port and the fourth power port are controlled to be turned on and turned off in the second display mode stage, and the third power port and the fourth power port are controlled to be turned on in the mode switching stage;
the third switching device is connected between the second power supply end of the display panel and the third power supply end of the panel driving module, and is configured to conduct a current path between the third power supply end and the second power supply end of the display panel in a second display mode stage and a stage of switching the second display mode to the first display mode; disconnecting a current path between the third power supply port and a second power supply port of the display panel in a first display mode stage and a stage of switching the first display mode to a second display mode;
the fourth switching device is connected between the second power supply end of the display panel and the fourth power supply port of the power supply management module, and is configured to conduct a current path between the fourth power supply port and the second power supply end of the display panel in a first display mode stage and a stage of switching from the first display mode to the second display mode; and disconnecting a current path between the fourth power supply port and the second power supply end of the display panel in a second display mode stage and a stage of switching the second display mode to the first display mode.
9. The display panel power supply circuit of claim 8, wherein:
the third switching device includes: a third transistor; the control electrode of the third transistor is connected with a third control signal, the first electrode of the third transistor is connected with the second power supply end of the display panel, and the second electrode of the third transistor is connected with the third power supply end of the panel driving module;
the fourth switching device includes: a fourth transistor; the control electrode of the fourth transistor is connected with a fourth control signal, the first electrode of the fourth transistor is connected with the second power end of the display panel, and the second electrode of the fourth transistor is connected with the fourth power end of the power management module.
10. The display panel power supply circuit of claim 9, wherein:
the third control signal and the fourth control signal are output signals of the panel driving module.
11. The display panel power supply circuit of claim 8, wherein:
the first power supply end of the display panel is a negative power supply end, and the second power supply end of the display panel is a positive power supply end.
12. A display panel power supply method, comprising:
determining a display mode of the display panel;
And controlling the opening and closing of the first power port of the panel driving module and the second power port of the power management module according to the display mode: the method comprises the steps of controlling a first power port to be closed and a second power port to be opened in a first display mode stage, controlling the first power port to be opened and the second power port to be closed in a second display mode stage, and controlling the first power port and the second power port to be opened in a mode switching stage; controlling a first switching device to conduct a current path between the first power supply port and the first power supply end of the display panel in a second display mode stage and a stage of switching the second display mode to the first display mode, and disconnecting the current path between the first power supply port and the first power supply end of the display panel in the first display mode stage and the stage of switching the first display mode to the second display mode; controlling a second switching device to conduct a current path between the second power supply port and the first power supply end of the display panel in a first display mode stage and a stage of switching the first display mode to a second display mode, and disconnecting the current path between the second power supply port and the first power supply end of the display panel in the second display mode stage and the stage of switching the second display mode to the first display mode; the first switching device is connected between a first power supply end of the display panel and a first power supply end of the panel driving module; the second switching device is connected between the first power supply end of the display panel and the second power supply end of the power supply management module.
13. The display panel power supply method of claim 12, wherein the method further comprises:
and controlling the opening and closing of the third power port of the panel driving module and the fourth power port of the power management module according to the display mode: the third power port and the fourth power port are controlled to be turned off and turned on in the first display mode stage, the third power port and the fourth power port are controlled to be turned on and turned off in the second display mode stage, and the third power port and the fourth power port are controlled to be turned on in the mode switching stage; controlling a third switching device to conduct a current path between the third power supply port and the second power supply end of the display panel in a second display mode stage and a stage of switching the second display mode to a first display mode, and disconnecting the current path between the third power supply port and the second power supply end of the display panel in the first display mode stage and the stage of switching the first display mode to the second display mode; controlling a fourth switching device to conduct a current path between the fourth power supply port and a second power supply end of the display panel in a first display mode stage and a stage of switching a first display mode to a second display mode, and disconnecting the current path between the fourth power supply port and the second power supply end of the display panel in the second display mode stage and the stage of switching the second display mode to the first display mode; the third switching device is connected between the second power supply end of the display panel and the third power supply end of the panel driving module; the fourth switching device is connected between the second power end of the display panel and the fourth power port of the power management module.
14. The display panel power supply method of claim 12, wherein:
the second display mode has a lower power consumption than the first display mode.
15. A display device comprising the display panel power supply circuit of any one of claims 1-11.
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