CN111711260B - Voltage supply circuit, voltage supply method and display device - Google Patents
Voltage supply circuit, voltage supply method and display device Download PDFInfo
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- CN111711260B CN111711260B CN202010697082.5A CN202010697082A CN111711260B CN 111711260 B CN111711260 B CN 111711260B CN 202010697082 A CN202010697082 A CN 202010697082A CN 111711260 B CN111711260 B CN 111711260B
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J7/00—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
- H02J7/34—Parallel operation in networks using both storage and other dc sources, e.g. providing buffering
- H02J7/345—Parallel operation in networks using both storage and other dc sources, e.g. providing buffering using capacitors as storage or buffering devices
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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
- G09G3/00—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes
- G09G3/20—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters
- G09G3/22—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources
- G09G3/30—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources using electroluminescent panels
- G09G3/32—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources using electroluminescent panels semiconductive, e.g. using light-emitting diodes [LED]
- G09G3/3208—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources using electroluminescent panels semiconductive, e.g. using light-emitting diodes [LED] organic, e.g. using organic light-emitting diodes [OLED]
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- 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
- G09G3/34—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 by control of light from an independent source
- G09G3/36—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 by control of light from an independent source using liquid crystals
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- General Physics & Mathematics (AREA)
- Theoretical Computer Science (AREA)
- Power Engineering (AREA)
- Chemical & Material Sciences (AREA)
- Crystallography & Structural Chemistry (AREA)
- Control Of Indicators Other Than Cathode Ray Tubes (AREA)
Abstract
The invention provides a voltage supply circuit, a voltage supply method and a display device. The voltage supply circuit comprises a voltage supply end, a voltage supplement end and a control circuit; the control circuit is respectively electrically connected with the voltage supply end and the voltage supplement end, is used for controlling to disconnect the voltage supplement end from the voltage supply end when the potential of the voltage supply end is greater than or equal to a first preset potential, and is used for controlling to pull up the potential of the voltage supply end by supplementing voltage when the potential of the voltage supply end is less than the first preset potential and greater than or equal to a second preset potential; the voltage supplement end is used for providing supplement voltage, and the first preset potential is larger than the second preset potential. When the display device is turned off, the time that the potential provided by the voltage providing end to the grid driving circuit is continuously the effective potential can be controlled to be prolonged, so that the charges in the display panel included in the display device are fully released.
Description
Technical Field
The present invention relates to the field of voltage providing technologies, and in particular, to a voltage providing circuit, a voltage providing method, and a display device.
Background
In order to avoid the undesirable phenomena of picture flickers and horizontal stripes caused by residual charges in the display screen when the display device is turned on again in the conventional display device, the high voltage provided to the gate driving circuit needs to be controlled for a longer time to fully release the residual charges in the display screen. The conventional method for maintaining the high voltage supplied to the gate driving circuit when the display device is turned off is to add a capacitor to the voltage supplying circuit, for example, the following three methods are used:
(1) tens of MLCCs (Multi-layer Ceramic Capacitors) are added in the voltage supply circuit, the space occupied by the MLCCs is large, the layout is not facilitated, and the cost is increased under the condition that the MLCCs are out of stock;
(2) 1-2 tantalum capacitors are added in the voltage supply circuit, and the tantalum capacitors are large in size, large in occupied space and high in cost;
(3) 1 electrolytic capacitor is added in the voltage supply circuit, the occupied space is large, and the height of the electrolytic capacitor exceeds that of a conventional component.
Disclosure of Invention
The present invention is directed to a voltage providing circuit, a voltage providing method, and a display device, and aims to solve the problems of the prior art that when the display device is turned off, the time for controlling the voltage provided by the voltage providing terminal to the gate driving circuit to be continuously the effective voltage is prolonged, the occupied space is large, the layout is not favorable, and the cost is high.
In order to achieve the above object, the present invention provides a voltage supply circuit for supplying a voltage to a gate driving circuit through a voltage supply terminal, the voltage supply circuit comprising the voltage supply terminal, a voltage supplement terminal and a control circuit, wherein,
the control circuit is respectively electrically connected with the voltage supply end and the voltage supplement end, is used for controlling to disconnect the voltage supplement end from the voltage supply end when the potential of the voltage supply end is greater than or equal to a first preset potential, and is used for controlling to pull up the potential of the voltage supply end by supplementing voltage when the potential of the voltage supply end is less than the first preset potential and is greater than or equal to a second preset potential;
the voltage supplement end is used for providing the supplement voltage, and the first preset potential is larger than the second preset potential.
Optionally, the control circuit includes a first control sub-circuit and a second control sub-circuit;
the first control sub-circuit is respectively electrically connected with the voltage supply end, the first voltage end and the control end of the second control sub-circuit and is used for controlling the communication between the control end of the second control sub-circuit and the first voltage end when the potential of the voltage supply end is greater than or equal to a first preset potential; the first voltage end is used for providing a first voltage;
the second control sub-circuit is respectively electrically connected with the voltage supply end and the voltage supplement end, and is used for controlling to disconnect the voltage supplement end from the voltage supply end when the potential of the control end is a first voltage, and controlling to pull up the potential of the voltage supply end through the supplement voltage when the potential of the voltage supply end is smaller than a first preset potential and larger than or equal to a second preset potential.
Optionally, the first control sub-circuit includes a first control diode, a first control resistor, and a first control transistor;
the anode of the first control diode is electrically connected with the voltage supply end, and the cathode of the first control diode is electrically connected with the first end of the first control resistor;
a second end of the first control resistor is electrically connected with a control electrode of the first control transistor;
the first electrode of the first control transistor is electrically connected with the control end of the second control sub-circuit, and the second electrode of the first control transistor is electrically connected with the first voltage end.
Optionally, the second control sub-circuit includes a second control resistor, a third control resistor, and a second control transistor; the control electrode of the second control transistor is electrically connected with the control end of the second control sub-circuit;
a first end of the second control resistor is electrically connected with the voltage supply end, and a second end of the second control resistor is electrically connected with the first electrode of the second control transistor;
a first end of the third control resistor is electrically connected to the voltage supply end, and a second end of the third control resistor is electrically connected to the control electrode of the second control transistor;
a second pole of the second control transistor is electrically connected to the voltage supply terminal.
Optionally, the voltage supply circuit of the present invention further includes an energy storage circuit;
the first end of the energy storage circuit is electrically connected with the voltage supply end, the second end of the energy storage circuit is electrically connected with the second voltage end, and the energy storage circuit is used for storing electric energy.
Optionally, the energy storage circuit includes at least one storage capacitor connected in parallel, a first end of the storage capacitor is electrically connected to the voltage supply terminal, and a second end of the storage capacitor is electrically connected to the second voltage terminal.
Optionally, the capacitance value of the tank circuit is smaller than a predetermined capacitance value.
The invention also provides a voltage providing method, which is applied to the voltage providing circuit and comprises the following steps:
when the potential of the voltage supply end is larger than or equal to a first preset potential, the control circuit controls to disconnect the connection between the voltage supplement end and the voltage supply end, and when the potential of the voltage supply end is smaller than the first preset potential and larger than or equal to a second preset potential, the control circuit controls to pull up the potential of the voltage supply end through the supplement voltage.
Optionally, the control circuit includes a first control sub-circuit and a second control sub-circuit; the voltage supply method comprises the following steps:
when the potential of the voltage supply end is greater than or equal to a first preset potential, the first control sub-circuit controls the communication between the control end of the second control sub-circuit and the first voltage end;
when the potential of the control end is a first voltage, the second control sub-circuit controls to disconnect the voltage supplement end and the voltage supply end, and when the potential of the voltage supply end is smaller than a first preset potential and larger than or equal to a second preset potential, the second control sub-circuit controls to pull up the potential of the voltage supply end through the supplement voltage.
The invention also provides a display device which comprises the voltage supply circuit.
Optionally, the display device according to the embodiment of the present invention further includes a power supply module;
the power supply module comprises a first power supply integrated circuit, a second power supply integrated circuit, a first resistance-capacitance circuit, a second resistance-capacitance circuit, a first diode, a second diode and a third diode;
the first power supply integrated circuit is used for providing power supply voltage through a power supply voltage output end;
the anode of the first diode is electrically connected with the power supply voltage output end, and the cathode of the first diode is electrically connected with the first end of the first resistance-capacitance circuit;
the anode of the second diode is electrically connected with the cathode of the first diode, and the cathode of the second diode is electrically connected with the first end of the second resistance-capacitance circuit; the first end of the second resistance-capacitance circuit is electrically connected with the voltage supplement end;
the anode of the third diode is electrically connected with the cathode of the second diode, and the cathode of the third diode is electrically connected with the voltage supply end;
the second power supply integrated circuit is used for providing charging voltage through a charging voltage output end, and the second end of the first resistance-capacitance circuit and the second end of the second resistance-capacitance circuit are both electrically connected with the charging voltage output end.
Optionally, the first resistance-capacitance circuit includes a first charging capacitor and a first charging resistor, and the second resistance-capacitance circuit includes a second charging capacitor and a second charging resistor; the power supply module further comprises a fourth diode;
the first end of the first charging capacitor is electrically connected with the first end of the first resistance-capacitance circuit, the second end of the first charging capacitor is electrically connected with the first end of the first charging resistor, and the second end of the first charging resistor is electrically connected with the second end of the first resistance-capacitance circuit;
the first end of the second charging capacitor is electrically connected with the first end of the second resistance-capacitance circuit, the second end of the second charging capacitor is electrically connected with the first end of the second charging resistor, and the second end of the second charging resistor is electrically connected with the second end of the second resistance-capacitance circuit;
the cathode of the second diode is electrically connected with the anode of the third diode through the fourth diode, the anode of the fourth diode is electrically connected with the cathode of the second diode, and the cathode of the fourth diode is electrically connected with the anode of the third diode.
The voltage providing circuit, the voltage providing method and the display device can control the voltage of the voltage providing end to be pulled up by the supplementary voltage when the potential of the voltage providing end is smaller than the first preset potential and larger than or equal to the second preset potential, so that when the display device is powered off, the time that the potential provided by the voltage providing end to the grid drive circuit is continuously the effective potential is controlled to be prolonged, and the charges in a display panel included in the display device are fully released.
Drawings
FIG. 1 is a block diagram of a voltage providing circuit according to an embodiment of the present invention;
FIG. 2 is a block diagram of a voltage providing circuit according to another embodiment of the present invention;
FIG. 3 is a circuit diagram of one embodiment of a voltage providing circuit according to the present invention;
FIG. 4 is a circuit diagram of another embodiment of a voltage providing circuit according to the present invention;
FIG. 5 is a circuit diagram of yet another embodiment of a voltage supply circuit according to the present invention;
fig. 6 is a circuit diagram of a display device according to an embodiment of the invention.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. 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 invention.
The transistors used in all embodiments of the present invention may be transistors, thin film transistors, or field effect transistors or other devices with the same characteristics. In the embodiment of the present invention, in order to distinguish two poles of the transistor except the control pole, one pole is called a first pole, and the other pole is called a second pole.
In practical operation, when the transistor is a triode, the control electrode may be a base electrode, the first electrode may be a collector electrode, and the second electrode may be an emitter electrode; alternatively, the control electrode may be a base electrode, the first electrode may be an emitter electrode, and the second electrode may be a collector electrode.
In practical operation, when the transistor is a thin film transistor or a field effect transistor, the control electrode may be a gate electrode, the first electrode may be a drain electrode, and the second electrode may be a source electrode; alternatively, the control electrode may be a gate electrode, the first electrode may be a source electrode, and the second electrode may be a drain electrode.
The voltage supply circuit according to the embodiment of the present invention is applied to a display device, and is configured to supply a voltage to a gate driving circuit through a voltage supply terminal, as shown in fig. 1, the voltage supply circuit includes the voltage supply terminal Vt, a voltage supplement terminal Vb, and a control circuit 11, wherein,
the control circuit 11 is electrically connected to the voltage supply terminal Vt and the voltage complement terminal Vb, respectively, and is configured to control disconnection between the voltage complement terminal Vb and the voltage supply terminal Vt when a potential of the voltage supply terminal Vt is greater than or equal to a first predetermined potential, and to control pull-up of a potential of the voltage supply terminal by a complementary voltage when the potential of the voltage supply terminal Vt is less than the first predetermined potential and greater than or equal to a second predetermined potential;
the voltage supplement terminal Vb is used for providing the supplement voltage, and the first preset potential is larger than the second preset potential.
The voltage supply circuit according to the embodiment of the present invention may control the voltage of the voltage supply terminal to be pulled up by the supplementary voltage when the potential of the voltage supply terminal is less than the first predetermined potential and greater than or equal to the second predetermined potential, so that when the display device is turned off, the time for which the potential supplied from the voltage supply terminal to the gate driving circuit is continuously the effective potential is controlled to be extended, and the charges in the display panel included in the display device are fully discharged.
When the display device is turned off, the power voltage from the power IC (Integrated Circuit) to the voltage supply terminal Vt is gradually decreased, and the voltage level of the voltage supply terminal Vt is gradually decreased.
In the embodiment of the present invention, the display device may be a TFT-LCD (thin film transistor-liquid crystal display), but is not limited thereto.
In the embodiment of the present invention, when the display device is turned off, the voltage provided by the voltage providing terminal to the gate driving circuit is continuously the effective voltage, which means that: the voltage providing terminal provides an effective voltage to the gate driving circuit, and when the display device is turned off, the gate driving circuit controls the potentials of the clock control signals output to the pixel circuit to be the effective voltage according to the effective voltage, so as to control the transistors of the gates in the pixel circuit connected to the clock control signals to be turned on, so as to release the residual charges, but not limited thereto.
In the embodiment of the present invention, the first predetermined potential and the second predetermined potential may be selected according to actual situations.
In the embodiment of the invention, when the display device normally operates, the voltage outputted from the voltage supply terminal Vt to the shift register unit is an operating voltage, and the operating voltage may be, for example, 30V, but not limited thereto.
In the embodiment of the present invention, when the potential to be supplied to the shift register unit through Vt is about 30V when the display device is turned off, the first predetermined potential may be set to be greater than or equal to 20V and less than or equal to 25V, and the second predetermined potential may be set to be less than or equal to 10V, but not limited thereto.
In practical implementation, the voltage value of the complementary voltage provided by the voltage complementary terminal Vb can be selected according to actual conditions.
In actual operation, the voltage polarity of the supplementary voltage may be the same as the voltage polarity of the operating voltage, for example, when the operating voltage is 30V, the supplementary voltage may be greater than or equal to 3V and less than or equal to 5V, but not limited thereto.
According to another embodiment, as shown in fig. 6, the voltage supplementary terminal Vb may also be electrically connected to the first terminal of the second charging capacitor C62, but not limited thereto.
As shown in fig. 1, the voltage supply terminal Vt is electrically connected to a shift register cell included in the gate driving circuit, and is used for supplying a voltage to the shift register cell.
In an embodiment of the present invention, the display device may include a gate driving circuit and a display panel, the display panel including a plurality of rows of gate lines, a plurality of columns of data lines, and a plurality of rows and a plurality of columns of pixel circuits; the grid driving circuit comprises a plurality of stages of shift register units, and the shift register units are used for providing grid driving signals for the grid lines.
In the embodiment of the present invention, the display device may be a liquid crystal display, but is not limited thereto; in actual operation, the display device may also be an OLED (organic light emitting diode) display.
In the embodiment of the present invention, when the transistors included in the pixel circuits of the display panel are n-type transistors, when the display device is turned off, the voltage providing terminal needs to provide the shift register unit included in the gate driving circuit with the high voltage VGH to release the charges remaining in the display panel, so as to avoid the undesirable phenomena of image flicker/horizontal stripes caused by the remaining charges when the display device is turned on.
Alternatively, as shown in fig. 2, the control circuit may include a first control sub-circuit 111 and a second control sub-circuit 112;
the first control sub-circuit 111 is electrically connected to the voltage supply terminal Vt, the first voltage terminal V1 and the control terminal of the second control sub-circuit 112, respectively, for controlling the communication between the control terminal of the second control sub-circuit 112 and the first voltage terminal V1 when the potential of the voltage supply terminal Vt is greater than or equal to a first predetermined potential; the first voltage terminal V1 is used for providing a first voltage;
the second control sub-circuit 112 is electrically connected to the voltage supply terminal Vt and the voltage complement terminal Vb, respectively, and is configured to control to disconnect the voltage complement terminal Vb from the voltage supply terminal Vt when the potential of the control terminal is a first voltage, and to control to pull up the potential of the voltage supply terminal Vt by the complement voltage when the potential of the voltage supply terminal Vt is less than a first predetermined potential and greater than or equal to a second predetermined potential.
In the embodiment of the present invention, the first voltage terminal may be a low voltage terminal or a ground terminal, and the first voltage may be a low voltage or a ground voltage, but not limited thereto.
In a specific implementation, the control circuit may include a first control sub-circuit 111 and a second control sub-circuit 112, and when the potential of the voltage supply terminal Vt is greater than or equal to a first predetermined potential, the first control sub-circuit 111 makes the potential of the control terminal of the second control sub-circuit 112 be a first voltage, so that the second control sub-circuit 112 controls to disconnect the voltage supplement terminal Vb from the voltage supply terminal Vt; when the potential of the voltage supply terminal Vt is less than the first predetermined potential and greater than or equal to the second predetermined potential, the second control sub-circuit 112 controls the voltage of the voltage supply terminal Vt to be pulled up by the complementary voltage, so that when the display device is turned off, the time for controlling the potential supplied from the voltage supply terminal to the gate driving circuit to be the effective potential is prolonged, and the charges in the display panel included in the display device are fully discharged.
Optionally, the first control sub-circuit includes a first control diode, a first control resistor, and a first control transistor;
the anode of the first control diode is electrically connected with the voltage supply end, and the cathode of the first control diode is electrically connected with the first end of the first control resistor;
a second terminal of the first control resistor is electrically connected with a control electrode of the first control transistor;
the first electrode of the first control transistor is electrically connected with the control end of the second control sub-circuit, and the second electrode of the first control transistor is electrically connected with the first voltage end.
Optionally, the second control sub-circuit includes a second control resistor, a third control resistor, and a second control transistor; the control electrode of the second control transistor is electrically connected with the control end of the second control sub-circuit;
a first end of the second control resistor is electrically connected with the voltage supply end, and a second end of the second control resistor is electrically connected with a first electrode of the second control transistor;
a first end of the third control resistor is electrically connected to the voltage supply end, and a second end of the third control resistor is electrically connected to the control electrode of the second control transistor;
a second pole of the second control transistor is electrically connected to the voltage supply terminal.
As shown in fig. 3, on the basis of the embodiment of the voltage supply circuit shown in fig. 2, the first control sub-circuit 111 comprises a first control diode D1, a first control resistor R1 and a first control transistor M1; the second control sub-circuit 112 comprises a second control resistor R2, a third control resistor R3 and a second control transistor M2;
an anode of the first control diode D1 is electrically connected to the voltage supply terminal Vt, and a cathode of the first control diode D1 is electrically connected to a first terminal of the first control resistor R1;
a second end of the first control resistor R1 is electrically connected with the gate of the first control transistor M1;
the drain electrode of the first control transistor M1 is electrically connected with the gate electrode of the second control transistor M2, and the source electrode of the first control transistor M1 is electrically connected with the ground end GND;
the gate of the second control transistor M2 is electrically connected to the control terminal of the second control sub-circuit 112;
a first terminal of the second control resistor R2 is electrically connected to the voltage supply terminal Vt, and a second terminal of the second control resistor R2 is electrically connected to the drain of the second control transistor M2;
a first terminal of the third control resistor R3 is electrically connected to the voltage supply terminal Vt, and a second terminal of the third control resistor R3 is electrically connected to the gate of the second control transistor M2;
the source of the second control transistor M2 is electrically connected to the voltage complement terminal Vb.
In the embodiment shown in fig. 3, M1 and M2 are both NMOS transistors (NMOS transistors), but not limited thereto.
In the embodiment shown in fig. 3, the threshold voltage of M1 is 10V, and the threshold voltage of M2 is 5V, but not limited thereto.
The embodiment of the voltage supply circuit of the invention as shown in figure 3 is in operation,
at the moment when the display device is turned off, Vt provides 30V, after D1 and R1, the voltage drops by 10V, the gate potential of M1 is 20V, M1 is turned on, the gate voltage of M2 is 0V, and M2 is turned off;
over time, the voltage provided by Vt is gradually reduced, when the voltage provided by Vt is smaller than 20V, after D1 and R1, the voltage is reduced by 10V, the grid potential of M1 is smaller than 10V, M1 is closed, M2 is turned on, and the potential of Vt can be bootstrapped up by the supplementary voltage provided by Vb.
In an embodiment of the present invention, as shown in fig. 4, on the basis of the embodiment of the voltage providing circuit shown in fig. 2, the voltage providing circuit further includes a tank circuit 40;
a first terminal of the tank circuit 40 is electrically connected to the voltage supply terminal Vt, and a second terminal of the tank circuit 40 is electrically connected to the second voltage terminal V2, and the tank circuit is configured to store electrical energy.
In a specific implementation, the energy storage circuit may include at least one storage capacitor connected in parallel, a first end of the storage capacitor is electrically connected to the voltage supply terminal, and a second end of the storage capacitor is electrically connected to the second voltage terminal.
Optionally, the second voltage terminal may be a low voltage terminal or a ground terminal, but is not limited thereto.
In the embodiment of the invention, the capacitance value of the energy storage circuit can be smaller than the preset capacitance value, so that residual charges in the display panel can be released by bootstrapping the potential of the voltage supply end when the display device is shut down under the condition that the capacitance value of the energy storage circuit is smaller, the occupied space is small, the layout is facilitated, and the cost is reduced.
Specifically, the predetermined capacitance value may be selected according to actual conditions.
As shown in fig. 5, on the basis of the embodiment of the voltage supply circuit shown in fig. 3, the voltage supply circuit further comprises a tank circuit 40;
the tank circuit 40 comprises a first capacitor C1, a second capacitor C2 and a third capacitor C3, which are connected in parallel with each other,
the first terminal of C1, the first terminal of C2, and the first terminal of C3 are all electrically connected to the voltage supply terminal Vt, and the second terminal of C1, the second terminal of C2, and the second terminal of C3 are all electrically connected to the ground terminal GND.
The voltage supply method according to the embodiment of the present invention is applied to the above-described voltage supply circuit, and includes:
when the potential of the voltage supply end is larger than or equal to a first preset potential, the control circuit controls to disconnect the connection between the voltage supplement end and the voltage supply end, and when the potential of the voltage supply end is smaller than the first preset potential and larger than or equal to a second preset potential, the control circuit controls to pull up the potential of the voltage supply end through the supplement voltage.
In the voltage providing method according to the embodiment of the invention, when the potential of the voltage providing terminal is less than the first predetermined potential and greater than or equal to the second predetermined potential, the control unit is configured to pull up the potential of the voltage providing terminal by the supplemental voltage, so that when the display device is turned off, the time for which the potential provided by the voltage providing terminal to the gate driving circuit is continuously the effective potential is controlled to be prolonged, and charges in a display panel included in the display device are fully released.
In particular implementations, the control circuit may include a first control sub-circuit and a second control sub-circuit; the voltage supply method may include:
when the potential of the voltage supply end is greater than or equal to a first preset potential, the first control sub-circuit controls the communication between the control end of the second control sub-circuit and the first voltage end;
when the potential of the control end is a first voltage, the second control sub-circuit controls to disconnect the voltage supplement end and the voltage supply end, and when the potential of the voltage supply end is smaller than a first preset potential and larger than or equal to a second preset potential, the second control sub-circuit controls to pull up the potential of the voltage supply end through the supplement voltage.
In a specific implementation, the control circuit may include a first control sub-circuit and a second control sub-circuit, and when the potential of the voltage supply terminal is greater than or equal to a first predetermined potential, the first control sub-circuit makes the potential of the control terminal of the second control sub-circuit be a first voltage, so that the second control sub-circuit controls to disconnect the connection between the voltage supplement terminal and the voltage supply terminal; when the potential of the voltage supply end is smaller than the first preset potential and larger than or equal to the second preset potential, the second control sub-circuit controls the supplementary voltage to pull up the potential of the voltage supply end, so that when the display device is turned off, the time that the potential provided by the voltage supply end to the grid drive circuit is continuously the effective potential is controlled to be prolonged, and the charges in a display panel included by the display device are fully released.
The display device provided by the embodiment of the invention comprises the voltage supply circuit.
In the embodiment of the invention, the display device further comprises a power supply module;
the power supply module comprises a first power supply integrated circuit, a second power supply integrated circuit, a first resistance-capacitance circuit, a second resistance-capacitance circuit, a first diode, a second diode and a third diode;
the first power supply integrated circuit is used for providing power supply voltage through a power supply voltage output end;
the anode of the first diode is electrically connected with the power supply voltage output end, and the cathode of the first diode is electrically connected with the first end of the first resistance-capacitance circuit;
the anode of the second diode is electrically connected with the cathode of the first diode, and the cathode of the second diode is electrically connected with the first end of the second resistance-capacitance circuit; the first end of the second resistance-capacitance circuit is electrically connected with the voltage supplement end;
the anode of the third diode is electrically connected with the cathode of the second diode, and the cathode of the third diode is electrically connected with the voltage supply end;
the second power supply integrated circuit is used for providing charging voltage through a charging voltage output end, and the second end of the first resistance-capacitance circuit and the second end of the second resistance-capacitance circuit are both electrically connected with the charging voltage output end.
When the display device normally operates, the power supply voltage is a direct current voltage, for example, the power supply voltage may be a direct current voltage of 30V, but not limited thereto; when the display device is turned off, the power supply voltage is gradually reduced to 0V;
when the display device works normally, the charging voltage may be a square wave voltage signal, and the voltage value of the charging voltage may be switched from tens of volts to 0V, but not limited thereto; when the display device is turned off, the voltage value of the charging voltage becomes 0V.
Optionally, the first resistance-capacitance circuit includes a first charging capacitor and a first charging resistor, and the second resistance-capacitance circuit includes a second charging capacitor and a second charging resistor; the power supply module further comprises a fourth diode;
the first end of the first charging capacitor is electrically connected with the first end of the first resistance-capacitance circuit, the second end of the first charging capacitor is electrically connected with the first end of the first charging resistor, and the second end of the first charging resistor is electrically connected with the second end of the first resistance-capacitance circuit;
the first end of the second charging capacitor is electrically connected with the first end of the second resistance-capacitance circuit, the second end of the second charging capacitor is electrically connected with the first end of the second charging resistor, and the second end of the second charging resistor is electrically connected with the second end of the second resistance-capacitance circuit;
the cathode of the second diode is electrically connected with the anode of the third diode through the fourth diode, the anode of the fourth diode is electrically connected with the cathode of the second diode, and the cathode of the fourth diode is electrically connected with the anode of the third diode.
In a specific implementation, the first resistance-capacitance circuit may include a first charging capacitor and a first charging resistor connected in series with each other, the second resistance-capacitance circuit may include a second charging capacitor and a second charging resistor connected in series with each other, and the power supply module may further include a fourth diode disposed between the second diode and the third diode; in actual operation, the number of the diodes adopted by the power supply module, the number of the resistors adopted by the power supply module, and the number of the capacitors adopted by the power supply module can be selected according to actual conditions.
As shown in fig. 6, the display device according to the embodiment of the invention includes a power supply module, a tank circuit 40, a control circuit, and a gate driving circuit 60;
the power supply module comprises a first power supply integrated circuit 61, a second power supply integrated circuit 62, a first diode D61, a second diode D62, a third diode D63, a fourth diode D64, a first charging capacitor C61, a second charging capacitor C62, a first charging resistor R61 and a second charging resistor R62;
the tank circuit 40 comprises a first capacitor C1, a second capacitor C2 and a third capacitor C3, which are connected in parallel with each other,
a first terminal of C1, a first terminal of C2, and a first terminal of C3 are all electrically connected to the voltage supply terminal Vt, and a second terminal of C1, a second terminal of C2, and a second terminal of C3 are all electrically connected to a ground terminal GND;
the control circuit comprises a first control sub-circuit 111 and a second control sub-circuit 112;
the first control sub-circuit 111 comprises a first control diode D1, a first control resistor R1 and a first control transistor M1; the second control sub-circuit 112 comprises a second control resistor R2, a third control resistor R3 and a second control transistor M2;
an anode of the first control diode D1 is electrically connected to the voltage supply terminal Vt, and a cathode of the first control diode D1 is electrically connected to a first terminal of the first control resistor R1;
a second end of the first control resistor R1 is electrically connected with the gate of the first control transistor M1;
the drain electrode of the first control transistor M1 is electrically connected with the gate electrode of the second control transistor M2, and the source electrode of the first control transistor M1 is electrically connected with a ground end GND;
the gate of the second control transistor M2 is electrically connected to the control terminal of the second control sub-circuit 112;
a first terminal of the second control resistor R2 is electrically connected to the voltage supply terminal Vt, and a second terminal of the second control resistor R2 is electrically connected to the drain of the second control transistor M2;
a first terminal of the third control resistor R3 is electrically connected to the voltage supply terminal Vt, and a second terminal of the third control resistor R3 is electrically connected to the gate of the second control transistor M2;
the source of the second control transistor M2 is electrically connected with the voltage supplement terminal Vb;
the voltage supply terminal Vt is electrically connected to the gate driving circuit 60;
the first power supply integrated circuit 61 is configured to provide a power supply voltage AVDD through a power supply voltage output terminal;
the anode of the first diode D61 is electrically connected with the power supply voltage output end, and the cathode of the first diode D61 is electrically connected with the first end of the first charging capacitor C61; a second terminal of the first charging capacitor C61 is electrically connected to a first terminal of the first charging resistor R61, and a second terminal of the first charging resistor R61 is connected to a charging voltage output terminal of the second power integrated circuit 62; the power supply integrated circuit 62 provides a charging voltage SW through the charging voltage output terminal;
a cathode of the first diode D61 is electrically connected to an anode of the second diode D62, a cathode of the second diode D62 is electrically connected to an anode of the fourth diode D64, a cathode of the fourth diode D64 is electrically connected to an anode of the third diode D63, and a cathode of the third diode D63 is electrically connected to a voltage supply terminal Vt;
a first end of the second charging capacitor C62 is electrically connected to an anode of the third diode D63, a second end of the second charging capacitor C62 is electrically connected to a first end of the second charging resistor R62, and a second end of the second charging resistor R62 is electrically connected to a charging voltage output end of the power supply integrated circuit 62;
the voltage supplementary terminal Vb is electrically connected to a first terminal of the second charging capacitor C62.
In the embodiment shown in fig. 6, M1 and M2 are NMOS transistors (NMOS transistors), the threshold voltage of M1 may be 10V, and the threshold voltage of M2 may be 3V, but not limited thereto.
In the embodiment of the display device shown in fig. 6, when the display device is turned off, the power supply voltage AVDD is gradually decreased from 30V to 0V, and the voltage value of the charging voltage SW is immediately changed to 0V;
in the embodiment of the display device shown in fig. 6, when the display device is turned off, the voltage level of Vt is maintained by C1, C2 and C3 to be discharged slowly, and the voltage level of Vt is gradually reduced;
when the potential of Vt is between 20V and 30V, after the potential of Vt passes D1 and R1, the voltage drops by 10V, so that the potential of the grid of M1 is between 10V and 20V, M1 is opened, the grid voltage of M2 is 0V, and M2 is closed;
when the potential of Vt drops below 20V, for example, the potential of Vt is 18V, after the potential of Vt passes D1 and R1, the voltage drops by 10V, so that the potential of the gate of M1 is 8V, M1 is closed, at this time, since SW is 0V, the potential of Vb is low, M2 is opened, Vb is communicated with Vt through opened M2 and R2, bootstrapping of the potential of Vt is completed, and the speed of the potential drop of Vt can be delayed when the display device is turned off.
The display device provided by the embodiment of the invention can be any product or component with a display function, such as a mobile phone, a tablet personal computer, a television, a display, a notebook computer, a digital photo frame, a navigator and the like.
While the foregoing is directed to the preferred embodiment of the present invention, it will be appreciated by those skilled in the art that various changes and modifications may be made therein without departing from the principles of the invention as set forth in the appended claims.
Claims (10)
1. A voltage supply circuit applied to a display device is used for supplying voltage to a gate drive circuit through a voltage supply terminal, and is characterized by comprising the voltage supply terminal, a voltage supplement terminal and a control circuit,
the control circuit is respectively electrically connected with the voltage supply end and the voltage supplement end, and is used for controlling to disconnect the voltage supplement end from the voltage supply end when the potential of the voltage supply end is greater than or equal to a first preset potential, and controlling to pull up the potential of the voltage supply end through supplement voltage when the potential of the voltage supply end is less than the first preset potential and greater than or equal to a second preset potential, so that the time that the potential provided by the voltage supply end to the grid drive circuit is continuously an effective potential is prolonged when the display device is shut down;
the voltage supplement end is used for providing the supplement voltage, and the first preset potential is greater than the second preset potential;
the control circuit comprises a first control sub-circuit and a second control sub-circuit;
the first control sub-circuit is respectively and electrically connected with the voltage supply end, the first voltage end and the control end of the second control sub-circuit, and is used for controlling the communication between the control end of the second control sub-circuit and the first voltage end when the potential of the voltage supply end is greater than or equal to a first preset potential; the first voltage end is used for providing a first voltage;
the second control sub-circuit is respectively electrically connected with the voltage supply end and the voltage supplement end, and is used for controlling to disconnect the voltage supplement end from the voltage supply end when the potential of the control end is a first voltage, and controlling to pull up the potential of the voltage supply end through the supplement voltage when the potential of the voltage supply end is smaller than a first preset potential and larger than or equal to a second preset potential.
2. The voltage supply circuit of claim 1 wherein the first control sub-circuit comprises a first control diode, a first control resistance, and a first control transistor;
the anode of the first control diode is electrically connected with the voltage supply end, and the cathode of the first control diode is electrically connected with the first end of the first control resistor;
a second end of the first control resistor is electrically connected with a control electrode of the first control transistor;
the first electrode of the first control transistor is electrically connected with the control end of the second control sub-circuit, and the second electrode of the first control transistor is electrically connected with the first voltage end.
3. The voltage supply circuit of claim 1, wherein the second control sub-circuit comprises a second control resistance, a third control resistance, and a second control transistor; the control electrode of the second control transistor is electrically connected with the control end of the second control sub-circuit;
a first end of the second control resistor is electrically connected with the voltage supply end, and a second end of the second control resistor is electrically connected with a first electrode of the second control transistor;
a first end of the third control resistor is electrically connected to the voltage supply end, and a second end of the third control resistor is electrically connected to the control electrode of the second control transistor;
a second pole of the second control transistor is electrically connected to the voltage supply terminal.
4. A voltage supply circuit according to any of claims 1 to 3 further comprising a tank circuit;
the first end of the energy storage circuit is electrically connected with the voltage supply end, the second end of the energy storage circuit is electrically connected with the second voltage end, and the energy storage circuit is used for storing electric energy.
5. The voltage supply circuit of claim 4 wherein the tank circuit comprises at least one reservoir capacitor connected in parallel with each other, a first terminal of the reservoir capacitor being electrically connected to the voltage supply terminal and a second terminal of the reservoir capacitor being electrically connected to the second voltage terminal.
6. The voltage supply circuit of claim 5 wherein the capacitance value of the tank circuit is less than a predetermined capacitance value.
7. A voltage supply method applied to the voltage supply circuit according to any one of claims 1 to 6, the voltage supply method comprising:
when the potential of the voltage providing end is greater than or equal to a first preset potential, the control circuit controls to disconnect the connection between the voltage supplementing end and the voltage providing end, and when the potential of the voltage providing end is smaller than the first preset potential and is greater than or equal to a second preset potential, the control circuit controls to pull up the potential of the voltage providing end through supplementing voltage so as to promote the time that the potential provided by the voltage providing end to the grid drive circuit is continuously an effective potential when the display device is shut down;
the control circuit comprises a first control sub-circuit and a second control sub-circuit; the voltage supply method comprises the following steps:
when the potential of the voltage supply end is greater than or equal to a first preset potential, the first control sub-circuit controls the connection between the control end of the second control sub-circuit and the first voltage end;
when the potential of the control end is a first voltage, the second control sub-circuit controls to disconnect the voltage supplement end and the voltage supply end, and when the potential of the voltage supply end is smaller than a first preset potential and larger than or equal to a second preset potential, the second control sub-circuit controls to pull up the potential of the voltage supply end through the supplement voltage.
8. A display device comprising the voltage supply circuit according to any one of claims 1 to 6.
9. The display device of claim 8, further comprising a power supply module;
the power supply module comprises a first power supply integrated circuit, a second power supply integrated circuit, a first resistance-capacitance circuit, a second resistance-capacitance circuit, a first diode, a second diode and a third diode;
the first power supply integrated circuit is used for providing power supply voltage through a power supply voltage output end;
the anode of the first diode is electrically connected with the power supply voltage output end, and the cathode of the first diode is electrically connected with the first end of the first resistance-capacitance circuit;
the anode of the second diode is electrically connected with the cathode of the first diode, and the cathode of the second diode is electrically connected with the first end of the second resistance-capacitance circuit; the first end of the second resistance-capacitance circuit is electrically connected with the voltage supplement end;
the anode of the third diode is electrically connected with the cathode of the second diode, and the cathode of the third diode is electrically connected with the voltage supply end;
the second power supply integrated circuit is used for providing charging voltage through a charging voltage output end, and the second end of the first resistance-capacitance circuit and the second end of the second resistance-capacitance circuit are both electrically connected with the charging voltage output end.
10. The display device according to claim 9, wherein the first resistance-capacitance circuit includes a first charging capacitor and a first charging resistor, and the second resistance-capacitance circuit includes a second charging capacitor and a second charging resistor; the power supply module further comprises a fourth diode;
the first end of the first charging capacitor is electrically connected with the first end of the first resistance-capacitance circuit, the second end of the first charging capacitor is electrically connected with the first end of the first charging resistor, and the second end of the first charging resistor is electrically connected with the second end of the first resistance-capacitance circuit;
the first end of the second charging capacitor is electrically connected with the first end of the second resistance-capacitance circuit, the second end of the second charging capacitor is electrically connected with the first end of the second charging resistor, and the second end of the second charging resistor is electrically connected with the second end of the second resistance-capacitance circuit;
the cathode of the second diode is electrically connected with the anode of the third diode through the fourth diode, the anode of the fourth diode is electrically connected with the cathode of the second diode, and the cathode of the fourth diode is electrically connected with the anode of the third diode.
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| CN107240373B (en) * | 2017-08-02 | 2020-12-04 | 京东方科技集团股份有限公司 | Drive signal generation circuit and display device |
| CN108877710B (en) * | 2018-07-03 | 2020-12-08 | 京东方科技集团股份有限公司 | Grid on-state voltage providing unit and method, display driving module and display device |
| CN109215601B (en) * | 2018-10-24 | 2021-04-27 | 合肥鑫晟光电科技有限公司 | Voltage supply unit, method, display driving circuit and display device |
| CN110010053B (en) * | 2019-04-17 | 2022-07-12 | 京东方科技集团股份有限公司 | Grid voltage control circuit, grid driving circuit and display device |
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