CN107784990B - The charging method of liquid crystal display panel, electric discharge adjust circuit and display device - Google Patents
The charging method of liquid crystal display panel, electric discharge adjust circuit and display device Download PDFInfo
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- CN107784990B CN107784990B CN201711045578.9A CN201711045578A CN107784990B CN 107784990 B CN107784990 B CN 107784990B CN 201711045578 A CN201711045578 A CN 201711045578A CN 107784990 B CN107784990 B CN 107784990B
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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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Abstract
The present invention provides a kind of charging method of liquid crystal display panel, it include: to be sampled to the voltage of digital source voltage input end, to obtain sampled voltage, sampled voltage is not more than the voltage of digital source voltage input end, and is positively correlated with the voltage of digital source voltage input end input；When sampled voltage is lower than reference voltage, the first grid line cut-in voltage is exported to level shifting circuit, wherein reference voltage is higher than the voltage of electric discharge trigger signal, and the absolute value of reference voltage and the difference in voltage of the electric discharge trigger signal is within a predetermined range；When sampled voltage is higher than reference voltage, the second grid line cut-in voltage is exported to level shifting circuit, the absolute value of the first grid line cut-in voltage is greater than the absolute value of the second grid line cut-in voltage, and the first grid line cut-in voltage and the second grid line cut-in voltage polarity are identical.The present invention also provides a kind of voltage regulator circuits and a kind of display device.It can rapidly and thoroughly be discharged liquid crystal display panel during shutdown using the charging method.
Description
Technical field
The present invention relates to field of display devices, and in particular, to a kind of charging method of liquid crystal display panel, a kind of electric discharge
Adjust circuit and a kind of display device that circuit is adjusted including the electric discharge.
Background technique
Due to the presence of liquid crystal capacitance in liquid crystal display panel, need during closing liquid crystal display panel to liquid crystal
Display panel discharges.Currently used discharge mode is the power down shape for detecting digital source voltage input end DVDD during shutdown
State, when the voltage of digital power voltage input end drops to setting value, triggering level conversion circuit (Level Shift IC's) is put
Electric trigger signal XAO owns in liquid crystal display panel so that the output end GOUT of gate driving circuit exports the voltage of high level
Grid line all open, so as to carry out charging neutrality release.
But it is bad there are still there is splashette, image retention etc. when insufficient, the next opening liquid crystal display panel of electric discharge at present
Phenomenon.Therefore, how to carry out thoroughly electric discharge to liquid crystal display panel after shut down becomes the technical issues of this field reception solves.
Summary of the invention
The purpose of the present invention is to provide a kind of charging method of liquid crystal display panel, electric discharges to adjust circuit and display dress
It sets, can quickly thoroughly be discharged during shutdown liquid crystal display panel using the electric discharge side.
To achieve the goals above, as one aspect of the present invention, a kind of charging method of liquid crystal display panel is provided,
Wherein, the charging method includes:
The voltage of digital source voltage input end is sampled, to obtain sampled voltage, the sampled voltage is no more than number
The voltage of word source voltage input end, and the voltage with digital source voltage input end input is positively correlated；
When the sampled voltage is lower than reference voltage, the first grid line cut-in voltage is exported to level shifting circuit, wherein
The reference voltage is higher than the voltage of electric discharge trigger signal, and the difference in voltage of the reference voltage and the electric discharge trigger signal
Absolute value within a predetermined range；
When the sampled voltage is higher than the reference voltage, Xiang Suoshu level shifting circuit exports the second grid line and opens electricity
Pressure, the absolute value of the first grid line cut-in voltage are greater than the absolute value of the second grid line cut-in voltage, and the first grid
Line cut-in voltage is identical with the second grid line cut-in voltage polarity.
Preferably, the voltage of the electric discharge trigger signal is 1.2V, and the preset range is 0 < Δ V≤0.1V.
As the second aspect of the invention, a kind of electric discharge adjusting circuit is provided, wherein the electric discharge adjusts circuit and includes
Sample that comparison module, that cut-in voltage provides module, digital source voltage input end and reference voltage for providing reference voltage is defeated
Enter end,
The first input end of the sampling comparison module is connected with digital source voltage input end, the sampling comparison module
Second input terminal is connected with reference voltage input terminal, and the output end and the cut-in voltage of the sampling comparison module provide module
Control terminal be connected, the sampling comparison module be used for the voltage of the digital source voltage input end is sampled to be adopted
Sample voltage, and the sampling comparison module is also used to when the sampled voltage is lower than the reference voltage to the unlatching electricity
The control terminal that pressure provides module provides first control signal, and the sampling comparison module is also used in the sampled voltage height
Second control signal is provided to the control terminal that the cut-in voltage provides module when the reference voltage, wherein the sampling
Voltage is not more than the voltage of digital source voltage input end, and the voltage positive with digital source voltage input end input
It closes, the reference voltage is higher than the voltage of electric discharge trigger signal, and the voltage of the reference voltage and the electric discharge trigger signal
Absolute value of the difference within a predetermined range；
The cut-in voltage provides module and is used to receive the first control letter in the control terminal that the cut-in voltage provides module
Number when export the first grid line cut-in voltage, the cut-in voltage provides module and is also used to provide the control of module in the cut-in voltage
Termination exports the second grid line cut-in voltage when receiving second control signal, wherein the absolute value of the first grid line cut-in voltage
Greater than the absolute value of the second grid line cut-in voltage, and the first grid line cut-in voltage and the second grid line cut-in voltage
Polarity is identical.
Preferably, the sampling comparison module includes sampling unit, comparator, output unit,
The first input end of the sampling unit is formed as the first input end of the sampling comparison module, and the sampling is single
Second input terminal of member is connected with ground terminal, is depressured and is exported with the voltage inputted to the digital source voltage input end；
The electrode input end of the comparator is connected with the output end of the sampling unit, the cathode input of the comparator
End is connected with the reference voltage input terminal, and the comparator can be lower than in the voltage that the electrode input end of the comparator inputs
Low level signal is exported when the voltage of the negative input input of the comparator, and the comparator can be in the comparator
High level signal is exported when the voltage that the negative input that the voltage of electrode input end input is higher than the comparator inputs；
The ground terminal provides second control signal, the output end phase of the control terminal of the output unit and the comparator
Even, the first input end of the output unit is connected with ground terminal, and the second input terminal and DC voltage of the output unit are defeated
Enter end to be connected, the output end of the output unit is connected with the control terminal that the cut-in voltage provides module, the output unit
The voltage that the first input end of output unit inputs can be exported when the comparator exports high level signal defeated to this
The output end of unit out, the output unit can be when the comparator export low level signal by the of the output unit
The first control signal obtained after the voltage processing of one input terminal input is exported to the output end of the output unit.
Preferably, the output unit includes first resistor, second resistance and output triode,
The first end of the first resistor is connected with the DC voltage input end, the second end of the first resistor and institute
The collector for stating output triode is connected, and the second end of the first resistor is connected with the output end of the output unit；
The first end of the second resistance is connected with the output end of the comparator, the second end of the second resistance and institute
The base electrode for stating output triode is connected, and the emitter of the output triode is connected with the ground terminal, and described defeated
Out triode can when the base electrode of the output triode receives high level signal by the emitter of the output triode and
Collector conducting.
Preferably, the sampling unit includes 3rd resistor and the 4th resistance, the first end of the 3rd resistor with it is described
Digital source voltage input end is connected, and the second end of the 3rd resistor is connected with the output end of the sampling unit, and the described 4th
The first end of resistance is connected with the second end of the 3rd resistor, and the second end of the 4th resistance is connected with the ground terminal.
Preferably, it includes that control signal input unit, selecting unit and voltage adjust list that the cut-in voltage, which provides module,
Member,
The input terminal of the control signal input unit is connected with the control terminal that the cut-in voltage provides module, the control
First output end of signal input unit processed is connected with the first control terminal of the selecting unit, the control signal input unit
Second output terminal be connected with the second control terminal of the selecting unit, the control signal input unit can believe the control
The signal of the input terminal input of number input unit is exported to the first output end of the control signal input unit, and the control
Signal input unit can reversely export afterwards the signal that the input terminal of the control signal input unit inputs to the control signal
The second output terminal of input unit；
The first input end of the selecting unit is connected with the second grid line cut-in voltage input terminal, and the of the selecting unit
Two input terminals are connected with the output end of the voltage regulation unit, and the output end of the selecting unit and the electric discharge adjust circuit
Output end be connected, the selecting unit can be when the first control terminal receives first control signal by the selecting unit
Second input terminal is connected with the output end of the selecting unit, and the selecting unit can receive institute in second control terminal
The first input end of the selecting unit is connected with the output end of the selecting unit when stating first control signal；
The input terminal of the voltage regulation unit is connected with the second grid line cut-in voltage, the voltage regulation unit energy
It is enough that boosting processing the first grid line cut-in voltage of acquisition is carried out to the second grid line cut-in voltage.
Preferably, the control signal input unit includes phase inverter, and the input terminal of the phase inverter and the control are believed
The input terminal of number input unit is connected, the second output terminal electricity of the output end of the phase inverter and the control signal input unit
Connection.
Preferably, the selecting unit includes first choice transistor and the second selection transistor,
The grid of the first choice transistor is connected with the second output terminal of the control signal input unit, and described the
First pole of one selection transistor is connected with the second grid line cut-in voltage input terminal, and the second of the first choice transistor
Pole is connected with the output end that the electric discharge adjusts circuit, and the grid of the first choice transistor receives first control signal
When, the first pole of the first choice transistor and the conducting of the second pole, the grid of the first choice transistor receive the second control
When signal processed, the first pole of the first choice transistor and the second pole are disconnected；
The grid of second selection transistor is connected with the first output end of the control signal input unit, and described the
First pole of two selection transistors is connected with the output end of the voltage regulation unit, the second pole of second selection transistor
The output end for adjusting circuit with the electric discharge is connected, when the grid of second selection transistor receives first control signal,
First pole of second selection transistor and the conducting of the second pole, the grid of second selection transistor receive the second control letter
Number when, the first pole of second selection transistor and the second pole disconnect.
Preferably, the voltage regulation unit include analog voltage input subelement, first diode, the second diode,
First storage capacitance, the second storage capacitance and third storage capacitance,
The analog voltage input subelement is for providing analog voltage, the output end of the analog voltage input subelement
It is connected with the anode of the first diode, and is connected with the first end of the third storage capacitance；
The cathode of the first diode is connected with the anode of second diode, the cathode of second diode with
The output end of the voltage regulation unit is connected；
The second end of the third capacitor is connected with the output end of the voltage regulation unit；
The first end of the first capacitor is connected with the ground terminal, the second end of the first capacitor and the voltage tune
The output end for saving unit is connected；
The first end of second capacitor is connected with the second grid line cut-in voltage input terminal, and the of second capacitor
Two ends are connected with the anode of second diode.
Preferably, the analog voltage input subelement includes analog voltage input, the 5th resistance and the 6th resistance, institute
The first end for stating the 5th resistance is connected with ground terminal, and the second end of the 5th resistance and the analog voltage input subelement
Output end is connected, and the first end of the 6th resistance is connected with the analog voltage input, the second end of the 6th resistance
It is connected with the output end of analog voltage input subelement.
As the second aspect of the invention, a kind of display device is provided, the display device includes liquid crystal display panel
And level shifting circuit, wherein the display device further includes that above-mentioned electric discharge provided by the present invention adjusts circuit, the electric discharge
The output end for adjusting circuit is connected with the gate turn-on voltage input terminal of the level shifting circuit.
When the sampled voltage be higher than the reference voltage when, show digital source voltage input end input voltage also above
The reference voltage.Meanwhile reference voltage is higher than the voltage of electric discharge trigger signal, shows that digital source voltage input end does not have also at this time
There is beginning power down, that is, do not shut down at this time to liquid crystal display panel, therefore, export the second grid line to level shifting circuit
Cut-in voltage, so as to ensure that liquid crystal display panel is normally shown.
After shutting down to liquid crystal display panel, digital source voltage input end starts power down, and therefore, sampled voltage also exists
It reduces.Since reference voltage is higher than the voltage in electric discharge trigger signal XAO, it can be in electric discharge trigger signal signal action
Forward direction level shifting circuit export higher first grid line cut-in voltage, even if in the voltage input end power down of following digital source
When, the first grid line cut-in voltage can be dragged down, is also ensured that the gate turn-on voltage of level shifting circuit output is higher than second gate
Pole cut-in voltage, it is ensured that the thin film transistor (TFT) in discharge process in liquid crystal display panel can be opened sufficiently, so that
Residual charge complete neutralization realizes thoroughly electric discharge.
Detailed description of the invention
The drawings are intended to provide a further understanding of the invention, and constitutes part of specification, with following tool
Body embodiment is used to explain the present invention together, but is not construed as limiting the invention.In the accompanying drawings:
Fig. 1 is the flow chart of the charging method of liquid crystal display panel provided by the present invention；
Fig. 2 is the module map that electric discharge provided by the present invention adjusts circuit；
Fig. 3 is a kind of circuit diagram for embodiment that electric discharge provided by the present invention adjusts circuit；
Fig. 4 is display device clock signal figure provided by the present invention.
Description of symbols
210: sampling comparison module 220: cut-in voltage provides module
211: sampling unit 212: comparator
213: output unit 221: control signal input unit
222: selecting unit 223: voltage regulation unit
2231: pressure input subelement 300: sub- level shifting circuit
400: power module
Specific embodiment
Below in conjunction with attached drawing, detailed description of the preferred embodiments.It should be understood that this place is retouched
The specific embodiment stated is merely to illustrate and explain the present invention, and is not intended to restrict the invention.
Through the inventors of the present invention discovered through researches that, due in shutdown process, voltage that digital source voltage input end provides
Power down and appearance delay slow (RC Delay), lead to being averaged for the high level voltage provided in shutdown process by level shifting circuit
Voltage about insufficient normal display when 1/3, cause the thin film transistor (TFT) in liquid crystal display panel to open insufficient, charging neutrality is slow
Slowly.
For these reasons, as one aspect of the present invention, a kind of charging method of liquid crystal display panel is provided,
In, as shown in Figure 1, the charging method includes:
In step s 110, the voltage of digital source voltage input end DVDD is sampled, it is described to obtain sampled voltage
Sampled voltage and the voltage of digital source voltage input end input are positively correlated；
When the sampled voltage is lower than reference voltage VREF, in the step s 120, to level shifting circuit output first
Grid line cut-in voltage VGH1, wherein the reference voltage be higher than electric discharge trigger signal XAO voltage, and the reference voltage with
The absolute value of the difference in voltage of the electric discharge trigger signal is within a predetermined range；
When the sampling is higher than the reference voltage, in step s 130, Xiang Suoshu level shifting circuit output second
Grid line cut-in voltage VGH, the absolute value of the first grid line cut-in voltage are greater than the absolute value of the second grid line cut-in voltage,
And the first grid line cut-in voltage is identical with the second grid line cut-in voltage polarity.
It should be pointed out that the second grid line cut-in voltage VGH described herein is liquid crystal display panel in display, liquid crystal
The gate turn-on voltage of thin film transistor (TFT) in display panel.Herein, " sampled voltage and the digital source voltage input end
The voltage of input is positively correlated " be meant that, the size of the voltage of size and digital source the voltage input end input of sampled voltage
Associated, and variation tendency is identical.That is, the voltage of digital source voltage input end is bigger, then sampled voltage is bigger, number
The voltage of word source voltage input end is smaller, then sampled voltage is smaller.Since sampled voltage is the electricity to digital source voltage input end
Pressure carries out sampling acquisition, and therefore, sampled voltage is not more than the voltage of digital source voltage input end.In the present invention, why
Be compared using sampled voltage with reference voltage, be because sampled voltage is lower than the voltage of digital source input terminal input, can be with
Simulation numeral source input terminal input voltage to electric discharge trigger signal output end pressure drop, so as to ensure digital source input
It holds and starts to discharge before excessive power down.
Sampled voltage is already clearly below the voltage of the digital source voltage input end input, therefore, when the sampled voltage is high
When the reference voltage, show the voltage of digital source voltage input end input also above the reference voltage.Meanwhile with reference to electricity
Pressure is higher than the voltage of electric discharge trigger signal XAO, shows that digital source voltage input end starts power down not yet at this time, that is, at this time simultaneously
It does not shut down to liquid crystal display panel, therefore, exports the second grid line cut-in voltage VGH to level shifting circuit, so as to
Ensure that liquid crystal display panel is normally shown.
After shutting down to liquid crystal display panel, digital source voltage input end DVDD starts power down, therefore, sampled voltage
Also it is reducing.Since reference voltage is higher than the voltage in electric discharge trigger signal XAO, it can be in electric discharge trigger signal XAO letter
The forward direction level shifting circuit of number action exports higher first grid line cut-in voltage VGH1, even if defeated in following digital source voltage
When entering to hold DVDD power down, the first grid line cut-in voltage VGH1 can be dragged down, is also ensured that the grid of level shifting circuit output is opened
Voltage is opened higher than second grid cut-in voltage, it is ensured that the thin film transistor (TFT) in discharge process in liquid crystal display panel can sufficiently be beaten
It opens, so that residual charge complete neutralization, realizes thoroughly electric discharge.
It will be readily appreciated by those skilled in the art that if long-time residual charge can make film brilliant in liquid crystal display panel
The characteristic of body pipe is deteriorated, and liquid crystal polarization occurs, and it is bad to will appear screen flash, image retention etc. for booting again.Using provided by the present invention
Charging method can thoroughly be discharged liquid crystal display panel after shut down, and can occur to avoid liquid crystal display panel
Screen flash, image retention etc. are bad.
In the present invention, special regulation is not done to the size of electric discharge trigger signal XAO, it is preferable that the electric discharge touching
The voltage of signalling is 1.2V, and correspondingly, the preset range is 0 < Δ V≤0.1V.
As the second aspect of the invention, a kind of electric discharge adjusting circuit is provided, wherein as shown in Fig. 2, the electric discharge is adjusted
Road economize on electricity including sampling comparison module 210, cut-in voltage offer module 220, digital source voltage input end DVDD and for providing
The reference voltage input terminal REF of reference voltage VREF.
The first input end of sampling comparison module 210 is connected with digital source voltage input end DVDD, samples comparison module 210
The second input terminal be connected with reference voltage input terminal REF, sample comparison module 210 output end and cut-in voltage provide module
220 control terminal is connected.Sampling comparison module 210 is for sampling the voltage of digital source voltage input end DVDD, to obtain
Sampled voltage is obtained, also, samples comparison module 210 and is also used to when the sampled voltage is lower than reference voltage VREF to unlatching electricity
The control terminal that pressure provides module 220 provides first control signal, and samples comparison module 210 and be also used in the sampled voltage
Second control signal is provided to the control terminal that cut-in voltage provides module 220 when higher than reference voltage VREF.Wherein, the sampling
Voltage is not more than the voltage of digital source voltage input end, and the voltage positive with digital source voltage input end input
It closes, the reference voltage is higher than the voltage of electric discharge trigger signal, and the voltage of the reference voltage and the electric discharge trigger signal
Absolute value of the difference within a predetermined range.
Cut-in voltage provides module 220 and is used to receive the first control in the control terminal of cut-in voltage offer module 220
The first grid line cut-in voltage VGH1 is exported when signal, cut-in voltage provides module 220 and is also used to provide module in the cut-in voltage
Control terminal export the second grid line cut-in voltage VGH when receiving second control signal.Wherein, the first grid line cut-in voltage
Absolute value be greater than the absolute value of the second grid line cut-in voltage, and the first grid line cut-in voltage and second grid line
Cut-in voltage polarity is identical.
Electric discharge provided by the present invention adjusts circuit for executing above-mentioned charging method provided by the present invention.Specifically,
The output end that cut-in voltage provides module is connected with the gate turn-on voltage input terminal of level shifting circuit.
Include the level shifting circuit liquid crystal display panel normally show when, cut-in voltage provide module 220 to
The gate turn-on voltage input terminal of level shifting circuit provides second grid cut-in voltage VGH.It include that the level turns when closing
When changing the liquid crystal display panel of circuit, cut-in voltage provides gate turn-on voltage input terminal of the module 220 to level shifting circuit
First grid cut-in voltage VGH1 is provided.Since the absolute value of first grid cut-in voltage VGH1 is greater than second grid cut-in voltage
The absolute value of VGH, therefore, even if during closing liquid crystal display panel, the electricity of digital source voltage input end DVDD input
When drops, even if dragging down the voltage of the gate turn-on voltage input terminal of incoming level converting unit, and the grid is opened
Voltage is begun to decline from the first grid cut-in voltage VGH1 greater than second grid cut-in voltage VGH.Due to the time ratio of electric discharge
It is ofer short duration, thereby it can be assured that during discharge, the grid line of liquid crystal display panel, which is received, opens electricity not less than second grid
The scanning signal of VGH is pressed, and ensures that the thin film transistor (TFT) in liquid crystal display panel is in the state opened, so as to ensure to close
It discharges during machine thorough.
In the present invention, special requirement is not done to the specific structure of sampling comparison module 210, as a kind of specific reality
Mode is applied, as shown in Figure 3, sampling comparison module 210 includes sampling unit 211, comparator 212 and output unit 213.
Specifically, as shown in Figure 3, the first input end of sampling unit 211 is formed as sampling the first defeated of comparison module
Enter to hold, (that is, the first input end of sampling unit 211 is connected with digital source voltage input end DVDD), the second of sampling unit 211
Input terminal is connected with ground terminal, is depressured and is exported with the voltage inputted to digital source voltage input end DVDD.
The electrode input end of comparator 212 is connected with the output end of sampling unit 211, the negative input of comparator 212
Be formed as sampling the second input terminal of comparison module (that is, the negative input of comparator 212 and reference voltage input terminal REF phase
Even).
The control terminal of output unit 213 is connected with the output end of comparator 212, the first input end of output unit 213 with
Ground terminal is connected, and the second input terminal of output unit 213 is connected with DC voltage input end VDD, the output end of output unit 213
The control terminal for providing module 220 with cut-in voltage is connected.Output unit 213 can be when comparator defeated 212 goes out high level signal
Second input terminal of output unit 213 is connected with the output end of the output unit 213, output unit 213 can be in comparator
The first input end of output unit 213 is connected with the output end of output unit 213 when 212 output low level signal.
In the present invention, sampled voltage and reference voltage VREF being compared using comparator 212, structure is simple, and
And result is accurate.
When sampled voltage is greater than reference voltage VREF, comparator 212 can export high level signal, and therefore, output is single
Member 213 can export the second control signal that 213 first input end of output unit provides.When sampled voltage is less than with reference to electricity
When pressing VREF, comparator 212 exports low level signal, and therefore, the output of output unit 213 can be to the of the output unit 213
The signal that two input terminals provide is handled and is obtained first control signal, and is exported.
In the present invention, particular determination is not done to the specific structure of output unit 213, specific reality shown in fig. 3
It applies in mode, output unit 213 includes first resistor R1, second resistance R2 and output triode Q1.
The first end of first resistor R1 is connected with DC voltage input end VDD, the second end and output three of first resistor R1
The collector of pole pipe Q1 is connected, and the second end of first resistor R1 is connected with the output end of output unit 213, output triode Q1
It can be when input terminal receives high level signal by the base electrode sum aggregate electrode conduction of output triode Q1.
The first end of second resistance R2 is connected with the output end of comparator 212, the second end and output three of second resistance R2
The base electrode of pole pipe Q1 is connected, and the emitter of output triode Q1 is connected with the ground terminal.
In output unit 213 provided by the present invention, the effect of second resistance R2 is to compare the output letter compared with device 212
It number is handled, the base stage of output triode Q1 is enabled to receive the base stage electricity in output triode Q1 working range
Pressure.The effect of first resistor R1 is that the voltage exported to DC voltage input end VDD carries out decompression processing, to obtain the first control
Signal processed.
When the output end of comparator 212 exports high level signal, which passes through the decompression of second resistance R2
After processing, it is transferred to the collector of output triode Q1, so that the collector and emitter of output triode Q1 is connected, it is defeated at this time
The first input end of unit 213 and the conducting of the second input terminal out, therefore, the output end voltage of output unit 213 are the first input
It is one of lower in end and the second input terminal, that is, the voltage of the first input end of output unit 213 is (that is, the second control letter
Number).
When the output end of comparator 212 exports low level signal, when the output end of comparator 212 exports low level signal
When, output triode Q1 is in an off state, and therefore, the output end P2 of output unit 213 is DC voltage input end VDD through the
The first control signal of the high level obtained after one resistance R1 pressure drop.
It should be pointed out that " high level signal " herein refers to the higher signal of level, it is equivalent in digital signal
1, rather than a fixed voltage signal." low level signal " refers to the lower hungry signal of level, 0 be equivalent in digital signal,
A not fixed voltage signal.
In the present invention, to the specific structure of sampling unit 211 also not special regulation, for example, shown in fig. 3
In specific embodiment, sampling unit 211 includes 3rd resistor R3 and the 4th resistance R4, the first end and number of 3rd resistor R3
Source voltage input end DVDD is connected, and the second end of 3rd resistor R3 is connected with the output end P1 of sampling unit 211, the 4th resistance R4
First end be connected with the second end of 3rd resistor R3, the second end of the 4th resistance R4 is connected with the ground terminal.In the present invention
In, setting 3rd resistor R3 and the 4th resistance R4 divides the digital source voltage input end DVDD voltage inputted, and simulates
The pressure drop of the control terminal of digital source voltage input end DVDD to electric discharge trigger signal XAO.
As a kind of preferred embodiment of the invention, it includes control signal input unit that cut-in voltage, which provides module 220,
221, selecting unit 222 and voltage regulation unit 223.
The input terminal for controlling signal input unit 221 is connected with the control terminal that cut-in voltage provides module 220, controls signal
First output end of input unit 221 is connected with the first control terminal of selecting unit 222, and the of control signal input unit 221
Two output ends are connected with the second control terminal of selecting unit 222.
The signal that the input terminal of the control signal input unit 221 can be inputted by controlling signal input unit 221 exports
To the first output end of the control signal input unit 221, and controlling signal input unit 221 can will control signal input
The signal of the input terminal input of unit 221 is reversely exported afterwards to the second output terminal of the control signal input unit 221.
The first input end of selecting unit 222 is connected with the second grid line cut-in voltage input terminal, selecting unit 222
Second input terminal is connected with the output end of voltage regulation unit 223, and the output end of selecting unit 222 and the electric discharge adjust circuit
Output end OUT be connected.Selecting unit 222 can be when the first control terminal receives the first control signal by the selection
Second input terminal of unit is connected with the output end of the selecting unit 222, and selecting unit 222 can be in the second control termination
The first input end of the selecting unit 222 is connected with the output end of the selecting unit when receiving first control signal.
The input terminal of voltage regulation unit 223 is connected with the second grid line cut-in voltage, and voltage regulation unit 222 can
Boosting processing is carried out to the second grid line cut-in voltage and obtains the first grid line cut-in voltage.
When output unit 213 exports first control signal, illustrate that sampled voltage lower than the reference voltage, at this time should
In off-mode, at this point, the second input terminal of selecting unit 222 is connected with the output end of the selecting unit 222, so as to
Second grid line cut-in voltage is exported to the output end OUT of voltage regulator circuit.When output unit 213 exports second control signal
When, illustrate that sampled voltage is higher than the reference voltage, is now in display state.Therefore, the first of selecting unit 222 defeated at this time
Enter end to be connected with the output end of the selecting unit 222, so as to export the first grid line cut-in voltage to voltage regulator circuit.
As a kind of preferred embodiment of the invention, controlling signal input unit 221 may include phase inverter, phase inverter
Input terminal be connected with the input terminal of the control signal input unit 221, the output end of the phase inverter and control signal input are single
The second output terminal electrical connection of member 221.
It is easily understood that phase inverter can play the role of carrying out input signal reversed and export.
In preferred embodiment shown in fig. 3, selecting unit 222 includes the selection of first choice transistor M1 and second
Transistor M2.
The grid of the first choice transistor M1 is connected with the second output terminal of control signal input unit 221, and first
The first pole of selection transistor M1 is connected with the second grid line cut-in voltage input terminal, the second pole of first choice transistor M1
The output end for adjusting circuit with the electric discharge is connected.First choice grid tube M1 is N-type transistor, that is, first choice transistor
When the grid of M1 receives first control signal, the first pole of first choice transistor M1 and the conducting of the second pole, first choice
When the grid of transistor M1 receives second control signal, the first pole of first choice transistor M1 and the second pole are disconnected.
Correspondingly, the grid of the second selection transistor M2 is connected with the first output end of control signal input unit 221, the
The first pole of two selection transistor M2 is connected with the output end of voltage regulation unit 223, the second pole of the second selection transistor M2
The output end OUT for adjusting circuit with the electric discharge is connected.Second selection transistor M2 is also N-type transistor, that is, the second selection is brilliant
When the grid of body pipe M2 receives first control signal, the first pole of second selection transistor M2 and the conducting of the second pole, second
When the grid of selection transistor M2 receives second control signal, the first pole of second selection transistor M2 and second is extremely broken
It opens.
In the present invention, special regulation is not done yet to the specific structure of voltage regulation unit 223, shown in fig. 3
In specific embodiment, voltage regulation unit 223 includes that analog voltage inputs subelement 2231, first diode D1, the two or two
Pole pipe D1, the first storage capacitance C1, the second storage capacitance C2 and third storage capacitance C3.
Analog voltage input subelement 2231 inputs the output end of subelement 2231 for providing analog voltage, analog voltage
It is connected with the anode of first diode D1, and is connected with the first end of third storage capacitance C1.
The cathode of first diode D1 is connected with the anode of the second diode D2, the cathode and voltage tune of the second diode D2
The output end P3 for saving unit 223 is connected.
The second end of third capacitor C3 is connected with the output end P3 of voltage regulation unit 223.
The first end of first capacitor C1 is connected with the ground terminal, the second end and voltage regulation unit of first capacitor C1
223 output end P3 is connected.
The first end of second capacitor C2 is connected with the second grid line cut-in voltage input terminal, the second end of the second capacitor C2
It is connected with the anode of the second diode D2.
In specific embodiment provided by the present invention, voltage regulation unit 223 is a kind of positive charge pump electricity circuit.
In the present invention, first capacitor C1, the second capacitor C2, third capacitor C3, first diode D1, the second diode D2
Effect be carry out pressure stabilizing.It is easily understood that the analog voltage and second provided in analog voltage input subelement 2231
Under the collective effect for the second grid line cut-in voltage that grid line cut-in voltage input terminal provides, can voltage regulation unit be exported
Higher than the first grid line cut-in voltage of the second grid line cut-in voltage.Also, due to first capacitor C1, the second capacitor C2 and third electricity
Hold C3 can storage capacitance so that the first grid line cut-in voltage for obtaining is not easy to decay after being promoted.
In the present invention, special regulation is not done to the specific structure of analog voltage input subelement 2231.For example, scheming
In embodiment shown in 3, analog voltage input subelement 2231 include analog voltage input AVDD, the 5th resistance R5 and
6th resistance R6.The first end of 5th resistance R5 is connected with ground terminal, second end and analog voltage input of the 5th resistance R5
The output end P4 of unit 2231 is connected, and the first end of the 6th resistance R6 is connected with analog voltage input AVDD, the 6th resistance R6
The output end P4 of second end and analog voltage input subelement 2231 be connected.
By available required first grid line of resistance value for designing the resistance value and the 6th resistance R6 of the 5th resistance R5
Cut-in voltage VGH1.
Electric discharge provided by the present invention, which is introduced, below with reference to Fig. 3 and Fig. 4 adjusts circuit in the different operating rank of display device
The working principle of section.
For any one display device, the working stage of the display device includes start-up phase T1, display stage
T2 and shut-down-phase T3 is total to three phases.
It is lower than reference voltage VREF, comparator when the voltage of start-up phase T1, the output end P1 of sampling unit 211 start
212 output high level signals, after being powered on due to digital source voltage input end DVDD completion (t1 moment), the second grid line cut-in voltage
Input terminal just starts power up (t2 moment), thus comparator 212 export high level or output low level for driving circuit all
There is no any influence, so as to ensure that driving circuit does not influence booting.
It is higher than reference voltage VREF in the voltage of display stage T2, the output end P1 of sampling unit 211, comparator 212 is defeated
High level signal out, the output end P2 voltage of output unit 213 are low level voltage, and the second selection transistor M2 ends, first
Selection transistor M1 conducting, the second grid line cut-in voltage VGH that the second grid line cut-in voltage input terminal is provided provide sub- level
Conversion circuit 300.
In shut-down-phase T3, when the voltage of the output end P1 of sampling unit 211 is lower than reference voltage VREF (that is, when t3
Carve), comparator 212 exports low level signal, and the voltage of the output end P2 of output unit 213 is high level voltage, therefore, second
Selection transistor M2 conducting, first choice transistor M1 cut-off, the first grid line cut-in voltage that voltage regulation unit 223 is provided
VGH1 is supplied to level shifting circuit 300.When the voltage of digital source voltage input end DVDD input drops to electric discharge trigger signal XAO
When (t4 moment), level shifting circuit makes low level signal VSS, clock signal clk and initial signal STV follow the second grid line
Cut-in voltage VGH1 increases the voltage of the output end P4 of analog voltage input subelement 2231, and analog voltage input
The output end P4 of unit 2231 in parallel third capacitor C3 (about 22 μ F), so that the voltage value that output end OUT voltage is elevated
Increase, the duration also extends, thereby may be ensured that the thin film transistor (TFT) in liquid crystal display panel is sufficiently opened, accelerate charge
It is comprehensive, rapidly eliminate booting residual charge.
As the third aspect of the invention, a kind of display device is provided, the display device includes liquid crystal display panel
And level shifting circuit, wherein the display device further includes that above-mentioned electric discharge provided by the present invention adjusts circuit, such as Fig. 3 institute
Show, the output end OUT that the electric discharge adjusts circuit is connected with the gate turn-on voltage input terminal of level shifting circuit 300.
As mentioned above it is possible, since the electric discharge adjusts circuit height can be provided to level shifting circuit 300 during shutdown
In the first grid line cut-in voltage of the second grid line cut-in voltage, so as to ensure in shutdown process in liquid crystal display panel
Thin film transistor (TFT) is opened, and so as to prevent charge residue, and extends the service life of liquid crystal display panel.
Preferably, the display device further includes providing the power module 400 of the second grid line cut-in voltage, the power module
400 output end is connected with the second grid line cut-in voltage input terminal.
It is understood that the principle that embodiment of above is intended to be merely illustrative of the present and the exemplary implementation that uses
Mode, however the present invention is not limited thereto.For those skilled in the art, essence of the invention is not being departed from
In the case where mind and essence, various changes and modifications can be made therein, these variations and modifications are also considered as protection scope of the present invention.
Claims (12)
1. a kind of charging method of liquid crystal display panel, which is characterized in that the charging method includes:
The voltage of digital source voltage input end is sampled, to obtain sampled voltage, the sampled voltage is not more than digital source
The voltage of voltage input end, and the sampled voltage and the voltage of digital source voltage input end input are positively correlated；
When the sampled voltage is lower than reference voltage, the first grid line cut-in voltage is exported to level shifting circuit, wherein described
Reference voltage be higher than electric discharge trigger signal voltage, and the reference voltage and it is described discharge trigger signal difference in voltage it is exhausted
Within a predetermined range to value；
When the sampled voltage is higher than the reference voltage, Xiang Suoshu level shifting circuit exports the second grid line cut-in voltage,
The second grid line cut-in voltage is thin film transistor (TFT) of the liquid crystal display panel in display, in the liquid crystal display panel
Gate turn-on voltage, the absolute value of the first grid line cut-in voltage is greater than the absolute value of the second grid line cut-in voltage,
And the first grid line cut-in voltage is identical with the second grid line cut-in voltage polarity.
2. charging method according to claim 1, which is characterized in that the voltage of the electric discharge trigger signal is 1.2V, institute
Stating preset range is 0 < Δ V≤0.1V.
3. a kind of electric discharge adjusts circuit, which is characterized in that the electric discharge adjusts circuit and mentions including sampling comparison module, cut-in voltage
For module, digital source voltage input end and for providing the reference voltage input terminal of reference voltage,
The first input end of the sampling comparison module is connected with digital source voltage input end, and the second of the sampling comparison module
Input terminal is connected with reference voltage input terminal, and the output end and the cut-in voltage of the sampling comparison module provide the control of module
End processed is connected, and the sampling comparison module is used to sample the voltage of the digital source voltage input end to obtain sampling electricity
Pressure, and the sampling comparison module is also used to mention when the sampled voltage is lower than the reference voltage to the cut-in voltage
First control signal is provided for the control terminal of module, and the sampling comparison module is also used to be higher than institute in the sampled voltage
Second control signal is provided to the control terminal that the cut-in voltage provides module when stating reference voltage, wherein the sampled voltage
No more than digital source voltage input end input voltage, and the sampled voltage and the digital source voltage input end input electricity
Positive pressure is related, and the reference voltage is higher than the voltage of electric discharge trigger signal, and the reference voltage and the electric discharge trigger signal
Difference in voltage absolute value within a predetermined range；
The cut-in voltage provides module and is used to receive the first control letter in the control terminal that the cut-in voltage provides module
Number when export the first grid line cut-in voltage, the cut-in voltage provides module and is also used to provide the control of module in the cut-in voltage
Termination exports the second grid line cut-in voltage when receiving the second control signal, wherein the second grid line cut-in voltage is liquid
LCD panel is in display, the gate turn-on voltage of the thin film transistor (TFT) in the liquid crystal display panel, first grid line
The absolute value of cut-in voltage is greater than the absolute value of the second grid line cut-in voltage, and the first grid line cut-in voltage and described
Second grid line cut-in voltage polarity is identical.
4. electric discharge according to claim 3 adjusts circuit, which is characterized in that the sampling comparison module includes that sampling is single
Member, comparator, output unit,
The first input end of the sampling unit is formed as the first input end of the sampling comparison module, the sampling unit
Second input terminal is connected with ground terminal, is depressured and is exported with the voltage inputted to the digital source voltage input end；
The electrode input end of the comparator is connected with the output end of the sampling unit, the negative input of the comparator with
The reference voltage input terminal is connected, and the voltage that the comparator can be inputted in the electrode input end of the comparator is lower than the ratio
Low level signal is exported when the voltage inputted compared with the negative input of device, and the comparator can be in the anode of the comparator
High level signal is exported when the voltage that the negative input that the voltage of input terminal input is higher than the comparator inputs；
The ground terminal provides the second control signal, the output end phase of the control terminal of the output unit and the comparator
Even, the first input end of the output unit is connected with ground terminal, and the second input terminal and DC voltage of the output unit are defeated
Enter end to be connected, the output end of the output unit is connected with the control terminal that the cut-in voltage provides module, the output unit
The voltage output that can be inputted the first input end of the output unit when the comparator exports high level signal extremely should
The output end of output unit, the output unit can be when the comparator export low level signal by the output unit
The first control signal obtained after the voltage processing of first input end input is exported to the output end of the output unit.
5. electric discharge according to claim 4 adjusts circuit, which is characterized in that the output unit includes first resistor, the
Two resistance and output triode,
The first end of the first resistor is connected with the DC voltage input end, the second end of the first resistor with it is described defeated
The collector of triode is connected out, and the second end of the first resistor is connected with the output end of the output unit；
The first end of the second resistance is connected with the output end of the comparator, the second end of the second resistance with it is described defeated
The base electrode of triode is connected out, and the emitter of the output triode is connected with the ground terminal, and three poles of the output
Pipe can be when the base electrode of the output triode receives high level signal by the emitter and collector of the output triode
Conducting.
6. electric discharge according to claim 4 adjusts circuit, which is characterized in that the sampling unit includes 3rd resistor and the
Four resistance, the first end of the 3rd resistor are connected with the digital source voltage input end, the second end of the 3rd resistor with
The output end of the sampling unit is connected, and the first end of the 4th resistance is connected with the second end of the 3rd resistor, described
The second end of 4th resistance is connected with the ground terminal.
7. the electric discharge according to any one of claim 4 to 6 adjusts circuit, which is characterized in that the cut-in voltage mentions
It include controlling signal input unit, selecting unit and voltage regulation unit for module,
The input terminal of the control signal input unit is connected with the control terminal that the cut-in voltage provides module, the control letter
Number the first output end of input unit is connected with the first control terminal of the selecting unit, and the of the control signal input unit
Two output ends are connected with the second control terminal of the selecting unit, and the control signal input unit can be defeated by the control signal
The signal for entering the input terminal input of unit is exported to the first output end of the control signal input unit, and the control signal
The signal that the input terminal of the control signal input unit inputs can reversely be exported afterwards to the control signal and be inputted by input unit
The second output terminal of unit；
The first input end of the selecting unit is connected with the second grid line cut-in voltage input terminal, and the second of the selecting unit is defeated
Enter end to be connected with the output end of the voltage regulation unit, the output end of the selecting unit adjusts the defeated of circuit with the electric discharge
Outlet is connected, and the selecting unit can be single by the selection when first control terminal receives the first control signal
Second input terminal of member is connected with the output end of the selecting unit, and the selecting unit can be received in second control terminal
The first input end of the selecting unit is connected with the output end of the selecting unit when to the first control signal；
The input terminal of the voltage regulation unit is connected with the second grid line cut-in voltage, and the voltage regulation unit can be right
The second grid line cut-in voltage carries out boosting processing and obtains the first grid line cut-in voltage.
8. electric discharge according to claim 7 adjusts circuit, which is characterized in that the control signal input unit includes reverse phase
Device, the input terminal of the phase inverter with it is described control signal input unit input terminal be connected, the output end of the phase inverter and
The second output terminal electrical connection of the control signal input unit.
9. electric discharge according to claim 7 adjusts circuit, which is characterized in that the selecting unit includes first choice crystal
Pipe and the second selection transistor,
The grid of the first choice transistor is connected with the second output terminal of the control signal input unit, first choosing
The first pole for selecting transistor is connected with the second grid line cut-in voltage input terminal, the second pole of the first choice transistor with
The output end that the electric discharge adjusts circuit is connected, and the grid of the first choice transistor receives the first control signal
When, the first pole of the first choice transistor and the conducting of the second pole, the grid of the first choice transistor receive described the
When two control signals, the first pole of the first choice transistor and the second pole are disconnected；
The grid of second selection transistor is connected with the first output end of the control signal input unit, second choosing
The first pole for selecting transistor is connected with the output end of the voltage regulation unit, the second pole of second selection transistor and institute
It states electric discharge and adjusts the output end of circuit and be connected, when the grid of second selection transistor receives first control signal, this
First pole of two selection transistors and the conducting of the second pole, the grid of second selection transistor receive second control signal
When, the first pole of second selection transistor and the second pole disconnect.
10. electric discharge according to claim 7 adjusts circuit, which is characterized in that the voltage regulation unit includes simulation electricity
Pressure input subelement, first diode, the second diode, the first storage capacitance, the second storage capacitance and third storage capacitance,
The analog voltage input subelement is for providing analog voltage, the output end of the analog voltage input subelement and institute
The anode for stating first diode is connected, and is connected with the first end of the third storage capacitance；
The cathode of the first diode is connected with the anode of second diode, the cathode of second diode with it is described
The output end of voltage regulation unit is connected；
The second end of the third storage capacitance is connected with the output end of the voltage regulation unit；
The first end of first storage capacitance is connected with the ground terminal, the second end of first storage capacitance and the electricity
The output end that pressure adjusts unit is connected；
The first end of second storage capacitance is connected with the second grid line cut-in voltage input terminal, second storage capacitance
Second end be connected with the anode of second diode.
11. electric discharge according to claim 10 adjusts circuit, which is characterized in that the analog voltage inputs subelement and includes
The first end of analog voltage input, the 5th resistance and the 6th resistance, the 5th resistance is connected with ground terminal, the 5th electricity
The second end of resistance is connected with the output end of analog voltage input subelement, the first end and the simulation of the 6th resistance
Voltage input end is connected, and the second end of the 6th resistance is connected with the output end of analog voltage input subelement.
12. a kind of display device, the display device includes liquid crystal display panel and level shifting circuit, which is characterized in that institute
Stating display device further includes that electric discharge described in any one of claim 3 to 11 adjusts circuit, and the electric discharge adjusts circuit
Output end is connected with the gate turn-on voltage input terminal of the level shifting circuit.
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201711045578.9A CN107784990B (en) | 2017-10-31 | 2017-10-31 | The charging method of liquid crystal display panel, electric discharge adjust circuit and display device |
| PCT/CN2018/110018 WO2019085725A1 (en) | 2017-10-31 | 2018-10-12 | Discharging method and discharging adjustment circuit for liquid crystal display panel, and display apparatus |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201711045578.9A CN107784990B (en) | 2017-10-31 | 2017-10-31 | The charging method of liquid crystal display panel, electric discharge adjust circuit and display device |
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| Publication Number | Publication Date |
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| CN107784990A CN107784990A (en) | 2018-03-09 |
| CN107784990B true CN107784990B (en) | 2019-10-01 |
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| CN201711045578.9A Expired - Fee Related CN107784990B (en) | 2017-10-31 | 2017-10-31 | The charging method of liquid crystal display panel, electric discharge adjust circuit and display device |
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| Country | Link |
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| CN (1) | CN107784990B (en) |
| WO (1) | WO2019085725A1 (en) |
Families Citing this family (13)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107784990B (en) * | 2017-10-31 | 2019-10-01 | 京东方科技集团股份有限公司 | The charging method of liquid crystal display panel, electric discharge adjust circuit and display device |
| CN108510930B (en) * | 2018-03-19 | 2021-06-15 | Oppo广东移动通信有限公司 | Electronic device |
| CN109523968B (en) * | 2018-12-24 | 2021-02-19 | 惠科股份有限公司 | Control circuit and display device |
| CN110085188B (en) * | 2019-05-05 | 2021-10-08 | 京东方科技集团股份有限公司 | Level conversion device of display panel, control method thereof and display panel |
| CN110379384A (en) * | 2019-06-06 | 2019-10-25 | 惠科股份有限公司 | Driving method and driving circuit of display panel and display device |
| CN110335571A (en) * | 2019-06-27 | 2019-10-15 | 惠科股份有限公司 | Driving device, driving method and display panel |
| CN112700743B (en) | 2019-10-22 | 2022-09-09 | 合肥鑫晟光电科技有限公司 | Voltage control circuit, control method thereof and display device |
| CN111312185B (en) * | 2020-02-26 | 2022-01-25 | 福州京东方光电科技有限公司 | Display control circuit, control method thereof and display device |
| CN111354321B (en) * | 2020-03-19 | 2022-03-25 | 福州京东方光电科技有限公司 | Level processing circuit, gate drive circuit and display device |
| CN111524485B (en) * | 2020-05-29 | 2021-12-31 | 京东方科技集团股份有限公司 | External drive circuit and drive method of OLED module and display device |
| CN112735346B (en) * | 2020-12-30 | 2022-03-25 | 昆山龙腾光电股份有限公司 | Shutdown control circuit, shutdown control method and display device |
| CN114694612B (en) * | 2022-03-23 | 2023-10-17 | Tcl华星光电技术有限公司 | Shutdown discharge circuit and shutdown discharge method |
| CN116798368A (en) * | 2023-05-27 | 2023-09-22 | 滁州惠科光电科技有限公司 | Display driving circuit, display module and display device |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN101299322B (en) * | 2007-04-30 | 2011-12-07 | 联詠科技股份有限公司 | Display device and drive device for eliminating power-off residual image |
| CN101377906B (en) * | 2007-08-31 | 2012-07-18 | 北京京东方光电科技有限公司 | Apparatus for quickening power supply discharge rate |
| CN101540149A (en) * | 2008-03-20 | 2009-09-23 | 中华映管股份有限公司 | Device and method for eliminating shutdown ghost |
| CN101739967B (en) * | 2008-11-12 | 2012-11-07 | 瀚宇彩晶股份有限公司 | Method for eliminating residual image after shutdown of display, control panel and display thereof |
| CN101777320B (en) * | 2010-01-27 | 2012-02-01 | 友达光电（苏州）有限公司 | Afterimage elimination circuit, display and electronic device |
| KR101961116B1 (en) * | 2012-11-19 | 2019-03-25 | 삼성디스플레이 주식회사 | Power control device and display devince comprising the same |
| CN104795040B (en) * | 2015-04-30 | 2017-05-10 | 京东方科技集团股份有限公司 | Array substrate, display device and shutdown ghost improving circuit for display device |
| CN105513549B (en) * | 2015-12-29 | 2018-06-29 | 深圳市华星光电技术有限公司 | For eliminating the circuit of liquid crystal display power-off ghost shadow and liquid crystal display |
| CN106125425B (en) * | 2016-06-27 | 2019-08-23 | 南京中电熊猫液晶显示科技有限公司 | Liquid crystal display panel, its driving method and display device |
| CN107784990B (en) * | 2017-10-31 | 2019-10-01 | 京东方科技集团股份有限公司 | The charging method of liquid crystal display panel, electric discharge adjust circuit and display device |
-
2017
- 2017-10-31 CN CN201711045578.9A patent/CN107784990B/en not_active Expired - Fee Related
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2018
- 2018-10-12 WO PCT/CN2018/110018 patent/WO2019085725A1/en active Application Filing
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| WO2019085725A1 (en) | 2019-05-09 |
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