CN107784990A - Charging method, electric discharge regulation circuit and the display device of liquid crystal display panel - Google Patents
Charging method, electric discharge regulation circuit and the display device of liquid crystal display panel Download PDFInfo
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- CN107784990A CN107784990A CN201711045578.9A CN201711045578A CN107784990A CN 107784990 A CN107784990 A CN 107784990A CN 201711045578 A CN201711045578 A CN 201711045578A CN 107784990 A CN107784990 A CN 107784990A
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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, including：The voltage of digital source voltage input end is sampled, to obtain sampled voltage, sampled voltage is not more than the voltage of digital source voltage input end, and the voltage positive correlation inputted with digital source voltage input end；When sampled voltage is less 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 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 more 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 circuit and a kind of display device.Liquid crystal display panel can rapidly and thoroughly be discharged in shutdown using the charging method.
Description
Technical field
The present invention relates to field of display devices, in particular it relates to a kind of charging method of liquid crystal display panel, a kind of electric discharge
Adjust circuit and a kind of display device for including the electric discharge regulation circuit.
Background technology
Due to the presence of liquid crystal capacitance in liquid crystal display panel, needed during liquid crystal display panel is closed to liquid crystal
Display panel is discharged.Currently used discharge mode is the power down shape that digital source voltage input end DVDD is detected in shutdown
State, when the voltage of digital power voltage input end drops to setting value, triggering level change-over circuit (Level Shift IC's) puts
Electric trigger signal XAO so that the output end GOUT of gate driving circuit exports the voltage of high level, owns in liquid crystal display panel
Grid line all open, so as to carry out charging neutrality release.
But at present there are still discharge insufficient, next opening liquid crystal display panel when splashette, image retention etc. occur bad
Phenomenon.Therefore, how to carry out thoroughly electric discharge to liquid crystal display panel after shut down turns into the technical problem that this area reception solves.
The content of the invention
It is an object of the invention to provide a kind of charging method of liquid crystal display panel, electric discharge regulation circuit and display dress
Put, quickly thoroughly liquid crystal display panel can be discharged in shutdown using the electric discharge side.
To achieve these goals, as one aspect of the present invention, there is provided a kind of charging method of liquid crystal display panel,
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 positive correlation with digital source voltage input end input；
When the sampled voltage is less 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 reference voltage and the difference in voltage of the trigger signal is exhausted
To being worth within a predetermined range；
When the sampled voltage is higher than the reference voltage, exports the second grid line to the level shifting circuit and open electricity
Pressure, the absolute value of the first grid line cut-in voltage are more 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 ＜ Δs V≤0.1V.
As the second aspect of the invention, there is provided one kind electric discharge regulation circuit, wherein, the electric discharge regulation circuit includes
It is defeated to sample comparison module, cut-in voltage offer module, digital source voltage input end and the reference voltage for providing reference voltage
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 is connected with reference voltage input terminal, and the output end of the sampling comparison module provides module with the cut-in voltage
Control terminal be connected, the sampling comparison module is used to sample to be adopted the voltage of the digital source voltage input end
Sample voltage, and the sampling comparison module is additionally operable to open electricity to described when the sampled voltage is less than the reference voltage
The control terminal that pressure provides module provides the first control signal, and the sampling comparison module is additionally operable to be higher than institute in the sampling
The control terminal for providing module when stating reference voltage to the cut-in voltage provides the second control signal, wherein, the sampled voltage
No more than the voltage of digital source voltage input end, and the voltage positive correlation with digital source voltage input end input, institute
Voltage of the reference voltage higher than electric discharge trigger signal is stated, and the reference voltage and the difference in voltage of the trigger signal is absolute
Value is within a predetermined range；
The cut-in voltage provides the control terminal that module is used to provide module in the cut-in voltage and receives the first control letter
Number when export the first grid line cut-in voltage, the cut-in voltage provides the control that module is additionally operable to provide module in the cut-in voltage
Termination exports the second grid line cut-in voltage when receiving the second control signal, wherein, the absolute value of the first grid line cut-in voltage
More 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 of member is connected with earth 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 pole input of the comparator
End is connected with the reference voltage input terminal, and the voltage that the comparator can input in the electrode input end of the comparator is less than
Low level signal is exported during 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 of negative input input is higher than the voltage that the negative input of the comparator inputs；
The earth terminal provides the second control signal, the control terminal of the output unit and the output end phase of the comparator
Even, the first input end of the output unit is connected with earth terminal, and the second input 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 of the cut-in voltage selecting 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
Go out the output end of unit, the output unit can be when the comparator exports low level signal by the of the output unit
The first control signal obtained after the voltage processing of one input 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 colelctor electrode 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 stage of the output triode is connected with the earth terminal, and described defeated
Go out triode can when the base electrode of the output triode receives high level signal by the emitter stage of the output triode and
Colelctor electrode turns on.
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 earth terminal.
Preferably, the cut-in voltage, which provides module, includes control signal input block, selecting unit and voltage-regulation list
Member,
The control terminal that the input of the control signal input block provides module with the cut-in voltage is connected, 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 block
The second output end be connected with the second control terminal of the selecting unit, the control signal input block can believe the control
The signal output of the input input of number input block is to the first output end of the control signal input block, and the control
Exported after the signals reverse that signal input unit can input the input of the control signal input block to the control signal
Second output end of input block；
The first input end of the selecting unit is connected with the second grid line cut-in voltage input, the selecting unit
The second input be connected with the output end of the voltage regulation unit, the output end of the selecting unit with it is described electric discharge adjust
The output end of circuit is connected, and the selecting unit can be single by the selection when the first control terminal receives the first control signal
Second input of member turns on the output end of the selecting unit, and the selecting unit can receive in second control terminal
The first input end of the selecting unit is turned on the output end of the selecting unit to during first control signal；
The input 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 block includes phase inverter, and the input of the reverser is believed with the control
The input of number input block is connected, the output end of the reverser and the second output end electricity of the control signal input block
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 end of the control signal input block, and described
First pole of one selection transistor is connected with the second grid line cut-in voltage input, and the second of the first choice transistor
Pole is connected with the output end of the electric discharge regulation circuit, 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 the second control
During signal processed, the first pole of the first choice transistor and the second pole disconnect；
The grid of second selection transistor is connected with the first output end of the control signal input block, and described
First pole of two selection transistors is connected with the output end of the voltage regulation unit, the second pole of second selection transistor
It is connected with the output end of the electric discharge regulation circuit, when the grid of second selection transistor receives the 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 includes analog voltage input, the first diode, the second diode, first
Storage capacitance, the second storage capacitance and the 3rd storage capacitance,
The analog voltage input subelement is used to provide analog voltage, the output end of the analog voltage input subelement
It is connected with the anode of first diode, and is connected with the first end of the 3rd storage capacitance；
The negative electrode of first diode is connected with the anode of second diode, the negative electrode of second diode with
The output end of the voltage regulation unit is connected；
Second end of the 3rd electric capacity is connected with the output end of the voltage regulation unit；
The first end of first electric capacity is connected with the earth terminal, and the second end and the voltage of first electric capacity are adjusted
The output end of section unit is connected；
The first end of second electric capacity is connected with the second grid line cut-in voltage input, and the of second electric capacity
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 earth terminal, the second end and the analog voltage input subelement of the 5th resistance
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, there is provided a kind of display device, the display device include liquid crystal display panel
And level shifting circuit, wherein, the display device also includes above-mentioned electric discharge regulation circuit provided by the present invention, the electric discharge
The output end of regulation circuit is connected with the gate turn-on voltage input of the level shifting circuit.
When the sampled voltage is higher than the reference voltage, show digital source voltage input end input voltage also above
The reference voltage.Meanwhile reference voltage shows that now digital source voltage input end does not have also higher than the voltage of electric discharge trigger signal
There is beginning power down, i.e. now liquid crystal display panel is not shut down, therefore, the second grid line is exported to level shifting circuit
Cut-in voltage, so as to ensure that liquid crystal display panel is normally shown.
After being shut down to liquid crystal display panel, digital source voltage input end starts power down, and therefore, sampled voltage also exists
Reduce., therefore, can be in electric discharge trigger signal signal action because reference voltage is higher than the voltage in electric discharge trigger signal XAO
Forward direction level shifting circuit export higher the 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, also ensures 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 fully, so that
Residual charge neutralizes completely, realizes thoroughly electric discharge.
Brief description of the drawings
Accompanying drawing is for providing a further understanding of the present invention, and a part for constitution instruction, 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 of electric discharge regulation circuit provided by the present invention；
Fig. 3 is a kind of circuit diagram of embodiment of electric discharge regulation circuit provided by the present invention；
Fig. 4 is display device clock signal figure provided by the present invention.
Description of reference numerals
210：Sample comparison module 220：Cut-in voltage provides module
211：Sampling unit 212：Comparator
213：Output unit 221：Control signal input block
222：Selecting unit 223：Voltage regulation unit
2231：Pressure input subelement 300：Sub- level shifting circuit
400：Power module
Embodiment
The embodiment of the present invention is described in detail below in conjunction with accompanying drawing.It should be appreciated that this place is retouched
The embodiment stated is merely to illustrate and explain the present invention, and is not intended to limit the invention.
Study and find through the present inventor, due to the voltage that in shutdown process, digital source voltage input end provides
Power down and appearance delay slow (RC Delay), and the high level voltage for causing to be provided by level shifting circuit in shutdown process is averaged
1/3 during the normal display of voltage about deficiency, cause the thin film transistor (TFT) in liquid crystal display panel to open insufficient, charging neutrality is delayed
Slowly.
For these reasons, as one aspect of the present invention, there is provided a kind of charging method of liquid crystal display panel, its
In, as shown in figure 1, the charging method includes：
In step s 110, digital source voltage input end DVDD voltage is sampled, it is described to obtain sampled voltage
Sampled voltage and the voltage positive correlation of digital source voltage input end input；
When the sampled voltage is less than reference voltage VREF, in the step s 120, to level shifting circuit output first
Grid line cut-in voltage VGH1, wherein, voltage of the reference voltage higher than electric discharge trigger signal XAO, and the reference voltage with
The absolute value of the difference in voltage of the trigger signal is within a predetermined range；
When the sampling is higher than the reference voltage, in step s 130, to level shifting circuit output second
Grid line cut-in voltage VGH, the absolute value of the first grid line cut-in voltage are more 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 is 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 positive correlation of input " is meant that, the size and the size of the voltage of digital source 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.Because 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
It is because sampled voltage is less than the voltage of digital source input input, can be with using sampled voltage compared with reference voltage
The voltage of simulation numeral source input input to electric discharge trigger signal output end pressure drop, so as to ensure in digital source input
Hold and start 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 shows that now digital source voltage input end does not start to power down also, i.e. now simultaneously higher than electric discharge trigger signal XAO voltage
Liquid crystal display panel is not shut down, therefore, the second grid line cut-in voltage VGH is exported to level shifting circuit, so as to
Ensure that liquid crystal display panel is normally shown.
After being shut down to liquid crystal display panel, digital source voltage input end DVDD starts power down, therefore, sampled voltage
Also reducing., therefore, can be in electric discharge trigger signal XAO letters because reference voltage is higher than the voltage in electric discharge trigger signal XAO
The forward direction level shifting circuit of number action exports the first higher 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, also ensures that the grid of level shifting circuit output is opened
Open voltage and be 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 fully be beaten
Open, so that residual charge neutralizes completely, realize 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 start again occurs that screen flash, image retention etc. are bad.Using provided by the present invention
Charging method liquid crystal display panel thoroughly can be discharged after shut down, and liquid crystal display panel can be avoided to occur
Screen flash, image retention etc. are bad.
In the present invention, special regulation is not done to the size for the trigger signal XAO that discharges, it is preferable that the electric discharge is touched
The voltage of signalling is 1.2V, and correspondingly, the preset range is 0 ＜ Δs V≤0.1V.
As the second aspect of the invention, there is provided one kind electric discharge regulation circuit, 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
Reference voltage VREF reference voltage input terminal REF.
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 be connected with reference voltage input terminal REF, output end and the cut-in voltage for sampling comparison module 210 provide module
220 control terminal is connected.Sampling comparison module 210 is used to sample digital source voltage input end DVDD voltage, to obtain
Sampled voltage is obtained, also, samples comparison module 210 and is additionally operable to when the sampled voltage is less than reference voltage VREF to unlatching electricity
The control terminal that pressure provides module 220 provides the first control signal, and samples comparison module 210 and be additionally operable in the sampled voltage
The control terminal for providing module 220 during higher than reference voltage VREF to cut-in voltage provides the second control signal.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
Close, the reference voltage is higher than the voltage of electric discharge trigger signal, and the reference voltage and the difference in voltage of the trigger signal
Absolute value within a predetermined range.
Cut-in voltage provides the control terminal that module 220 is used to provide module 220 in the cut-in voltage and receives the first control
The first grid line cut-in voltage VGH1 is exported during signal, cut-in voltage provides module 220 and is additionally operable to provide module in the cut-in voltage
Control terminal export the second grid line cut-in voltage VGH when receiving the second control signal.Wherein, the first grid line cut-in voltage
Absolute value be more 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 regulation circuit provided by the present invention is used to perform 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 of level shifting circuit.
When the liquid crystal display panel including the level shifting circuit is normally shown, cut-in voltage provide module 220 to
The gate turn-on voltage input of level shifting circuit provides second grid cut-in voltage VGH.Include the level turn when closing
When changing the liquid crystal display panel of circuit, cut-in voltage provides gate turn-on voltage input of the module 220 to level shifting circuit
First grid cut-in voltage VGH1 is provided.Because first grid cut-in voltage VGH1 absolute value is more than second grid cut-in voltage
VGH absolute value, therefore, even if during liquid crystal display panel is closed, the electricity of digital source voltage input end DVDD inputs
During drops, even if dragging down the voltage of the gate turn-on voltage input of incoming level converting unit, and the grid is opened
Voltage is begun to decline from the first grid cut-in voltage VGH1 more than second grid cut-in voltage VGH.Due to the time ratio of electric discharge
Ofer short duration, thereby it can be assured that in discharge process, the grid line of liquid crystal display panel receives opens electricity not less than second grid
VGH scanning signal 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
Discharged during machine thorough.
In the present invention, special requirement is not done to the concrete structure for sampling comparison module 210, as a kind of specific real
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 is connected with earth 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 (that is, the negative input of comparator 212 and reference voltage input terminal REF phases of comparison module
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
Earth terminal is connected, and the second input of output unit 213 is connected with DC voltage input end VDD, the output end of output unit 213
It is connected with the control terminal of cut-in voltage selecting module 220.Output unit 213 can be when comparator defeated 212 goes out high level signal
Second input of output unit 213 is turned on the output end of the output unit 213, output unit 213 can be in comparator
The first input end of output unit 213 is turned on the output end of output unit 213 during 212 output low level signal.
In the present invention, sampled voltage and reference voltage VREF are compared using comparator 212, it is simple in construction, and
And result is accurate.
When sampled voltage is more 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 the first input end of output unit 213 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 inputs provide is handled and obtains the first control signal, and is exported.
In the present invention, particular determination is not done to the concrete structure of output unit 213, in figure 3 shown specific reality
Apply in mode, output unit 213 includes first resistor R1, second resistance R2 and output triode Q1.
First resistor R1 first end is connected with DC voltage input end VDD, first resistor R1 the second end and output three
Pole pipe Q1 colelctor electrode is connected, and first resistor R1 the second end is connected with the output end of output unit 213, output triode Q1
Output triode Q1 base electrode and colelctor electrode can be turned on when input receives high level signal.
Second resistance R2 first end is connected with the output end of comparator 212, second resistance R2 the second end and output three
Pole pipe Q1 base electrode is connected, and output triode Q1 emitter stage is connected with the earth terminal.
In output unit 213 provided by the present invention, the output that second resistance R2 effect is to contrast compared with device 212 is believed
Number handled so that output triode Q1 base stage can receive the base stage electricity in output triode Q1 working ranges
Pressure.First resistor R1 effect is to carry out decompression processing to the voltage of DC voltage input end VDD outputs, to obtain the first control
Signal processed.
When the output end of comparator 212 exports high level signal, the high level signal passes through second resistance R2 decompression
After processing, output triode Q1 colelctor electrode is transferred to so that output triode Q1 collector and emitter conducting, it is now defeated
Go out first input end and the conducting of the second input of unit 213, therefore, the output end voltage of output unit 213 is the first input
It is one of relatively low in end and the second input, i.e. 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 off, and therefore, the output end P2 of output unit 213 is DC voltage input end VDD through the
First control signal of the high level obtained after one resistance R1 pressure drops.
It is pointed out that " high level signal " herein refers to the higher signal of level, equivalent in data signal
1, rather than a fixed voltage signal." low level signal " refers to the relatively low hungry signal of level, equivalent to 0 in data signal,
A not fixed voltage signal.
In the present invention, to the concrete structure of sampling unit 211 also without special regulation, for example, shown in figure 3
In embodiment, sampling unit 211 includes 3rd resistor R3 and the 4th resistance R4,3rd resistor R3 first end and numeral
Source voltage input end DVDD is connected, and 3rd resistor R3 the second end is connected with the output end P1 of sampling unit 211, the 4th resistance R4
First end be connected with 3rd resistor R3 the second end, the 4th resistance R4 the second end is connected with the earth terminal.In the present invention
In, the voltage for setting 3rd resistor R3 and the 4th resistance R4 to input digital source voltage input end DVDD carries out partial pressure, and simulates
Pressure drops of the digital source voltage input end DVDD to electric discharge trigger signal XAO control terminal.
As a kind of preferred embodiment of the present invention, cut-in voltage, which provides module 220, includes control signal input block
221st, selecting unit 222 and voltage regulation unit 223.
The control terminal that the input of control signal input block 221 provides module 220 with cut-in voltage is connected, control signal
First output end of input block 221 is connected with the first control terminal of selecting unit 222, and the of control signal input block 221
Two output ends are connected with the second control terminal of selecting unit 222.
The signal output that control signal input block 221 can input the input of the control signal input block 221
To the first output end of the control signal input block 221, and control signal input block 221 can input control signal
Exported after the signals reverse of the input input of unit 221 to the second output end of the control signal input block 221.
The first input end of selecting unit 222 is connected with the second grid line cut-in voltage input, selecting unit 222
Second input is connected with the output end of voltage regulation unit 223, and the output end of selecting unit 222 adjusts circuit with the electric discharge
Output end OUT be connected.Selecting unit 222 can be when the first control terminal receives first control signal by the selection
Second input of unit turns on the output end of the selecting unit 222, and selecting unit 222 can be in the described second control termination
The first input end of the selecting unit 222 is turned on the output end of the selecting unit when receiving the first control signal.
The input 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 the first control signal, illustrate that sampled voltage is less than the reference voltage, now should
In off-mode, now, the second input of selecting unit 222 turns on 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 the second control signal
When, illustrate that sampled voltage is higher than the reference voltage, be now in dispaly state.Therefore, it is now the first of selecting unit 222 defeated
Enter end to turn on the output end of the selecting unit 222, so as to which the first grid line cut-in voltage is exported to voltage regulator circuit.
As a kind of preferred embodiment of the present invention, control signal input block 221 can include phase inverter, reverser
Input be connected with the input of the control signal input block 221, the output end of the reverser and control signal input are single
The second output end electrical connection of member 221.
It is easily understood that phase inverter can play a part of carrying out input signal reversely and exporting.
In figure 3 in shown preferred embodiment, selecting unit 222 includes the selections of first choice transistor M1 and second
Transistor M2.
The grid of the first choice transistor M1 is connected with the second output end of control signal input block 221, and first
Selection transistor M1 the first pole is connected with the second grid line cut-in voltage input, first choice transistor M1 the second pole
It is connected with the output end of the electric discharge regulation circuit.First choice grid tube M1 is N-type transistor, i.e. first choice transistor
When M1 grid receives the first control signal, first choice transistor M1 the first pole and the conducting of the second pole, first choice
When transistor M1 grid receives the second control signal, first choice transistor M1 the first pole and the second pole disconnect.
Correspondingly, the second selection transistor M2 grid is connected with the first output end of control signal input block 221, the
Two selection transistor M2 the first pole is connected with the output end of voltage regulation unit 223, the second selection transistor M2 the second pole
It is connected with the output end OUT of the electric discharge regulation circuit.Second selection transistor M2 is also N-type transistor, i.e. the second selection is brilliant
When body pipe M2 grid receives the first control signal, second selection transistor M2 the first pole and the conducting of the second pole, second
When selection transistor M2 grid receives the second control signal, second selection transistor M2 the first pole and second is extremely broken
Open.
In the present invention, special regulation is not done yet to the concrete structure of voltage regulation unit 223, it is shown in figure 3
In embodiment, voltage regulation unit 223 includes analog voltage input subelement 2231, the first diode D1, the two or two
Pole pipe D1, the first storage capacitance C1, the second storage capacitance C2 and the 3rd storage capacitance C3.
Analog voltage input subelement 2231 is used to provide analog voltage, and analog voltage inputs the output end of subelement 2231
It is connected with the first diode D1 anode, and is connected with the 3rd storage capacitance C1 first end.
First diode D1 negative electrode is connected with the second diode D2 anode, and the second diode D2 negative electrode and voltage are adjusted
The output end P3 of section unit 223 is connected.
3rd electric capacity C3 the second end is connected with the output end P3 of voltage regulation unit 223.
First electric capacity C1 first end is connected with the earth terminal, the first electric capacity C1 the second end and voltage regulation unit
223 output end P3 is connected.
Second electric capacity C2 first end is connected with the second grid line cut-in voltage input, the second electric capacity C2 the second end
It is connected with the second diode D2 anode.
In embodiment provided by the present invention, voltage regulation unit 223 is a kind of positive charge pump electricity circuit.
In the present invention, the first electric capacity C1, the second electric capacity C2, the 3rd electric capacity C3, the first diode D1, the second diode D2
Effect be carry out voltage 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 provides, voltage regulation unit can be exported
Higher than the first grid line cut-in voltage of the second grid line cut-in voltage.Also, due to the first electric capacity C1, the second electric capacity C2 and the 3rd electricity
Holding C3 being capable of storage capacitance so that the first grid line cut-in voltage obtained after lifting is not easy to decay.
In the present invention, the concrete structure for subelement 2231 being inputted to analog voltage does not do special regulation.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 R6.5th resistance R5 first end is connected with earth terminal, the 5th resistance R5 the second end and analog voltage input
The output end P4 of unit 2231 is connected, and the 6th resistance R6 first end is connected with analog voltage input AVDD, the 6th resistance R6
The output end P4 of the second end and analog voltage input subelement 2231 be connected.
The first required grid line can be obtained by designing the 5th resistance R5 resistance and the 6th resistance R6 resistance
Cut-in voltage VGH1.
Different operating rank of the electric discharge regulation circuit provided by the present invention in display device is introduced with reference to Fig. 3 and Fig. 4
The operation principle of section.
For any one display device, the working stage of the display device includes start-up phase T1, display stage
The common three phases of T2 and shut-down-phase T3.
In start-up phase T1, reference voltage VREF, comparator are less than when the output end P1 of sampling unit 211 voltage starts
212 output high level signals, after electricity in digital source voltage input end DVDD completions (t1 moment), the second grid line cut-in voltage
Input just starts power up (t2 moment), thus comparator 212 export high level or output low level for drive circuit all
There is no any influence, so as to ensure that drive circuit does not influence on start.
In display stage T2, the output end P1 of sampling unit 211 voltage is higher than reference voltage VREF, and comparator 212 is defeated
Going out high level signal, the output end P2 voltages of output unit 213 are low level voltage, and the second selection transistor M2 ends, first
Selection transistor M1 is turned on, and the second grid line cut-in voltage VGH that the second grid line cut-in voltage input is provided provides sub- level
Change-over circuit 300.
In shut-down-phase T3, when the output end P1 of sampling unit 211 voltage is less than reference voltage VREF (that is, during t3
Carve), comparator 212 exports low level signal, and the output end P2 of output unit 213 voltage is high level voltage, therefore, second
Selection transistor M2 is turned on, first choice transistor M1 cut-offs, 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 inputs 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, add the output end P4 of analog voltage input subelement 2231 voltage, and analog voltage input
The output end P4 of unit 2231 in parallel 3rd electric capacity C3 (about 22 μ F) so that the magnitude of voltage that output end OUT voltages are elevated
Increase, duration also extend, thereby may be ensured that the thin film transistor (TFT) in liquid crystal display panel is fully opened, accelerate electric charge
It is comprehensive, rapidly eliminate start residual charge.
As the third aspect of the invention, there is provided a kind of display device, the display device include liquid crystal display panel
And level shifting circuit, wherein, the display device also includes above-mentioned electric discharge regulation circuit provided by the present invention, such as Fig. 3 institutes
Show, the output end OUT of the electric discharge regulation circuit is connected with the gate turn-on voltage input of level shifting circuit 300.
As mentioned above it is possible, because the electric discharge regulation circuit can provide height in shutdown to level shifting circuit 300
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 also includes the power module 400 for providing the second grid line cut-in voltage, the power module
400 output end is connected with the second grid line cut-in voltage input.
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, but the invention is not limited in this.For those skilled in the art, the essence of the present invention is not being departed from
In the case of refreshing and essence, various changes and modifications can be made therein, and 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, it is characterised 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 voltage positive correlation with digital source voltage input end input；
When the sampled voltage is less than reference voltage, the first grid line cut-in voltage is exported to level shifting circuit, wherein, it is described
Reference voltage is higher than the voltage of electric discharge trigger signal, and the absolute value of the reference voltage and the difference in voltage of the trigger signal
Within a predetermined range；
When the sampled voltage is higher than the reference voltage, the second grid line cut-in voltage is exported to the level shifting circuit,
The absolute value of the first grid line cut-in voltage is more than the absolute value of the second grid line cut-in voltage, and first grid line is opened
It is identical with the second grid line cut-in voltage polarity to open voltage.
2. charging method according to claim 1, it is characterised in that the voltage of the electric discharge trigger signal is 1.2V, institute
It is 0 ＜ Δs V≤0.1V to state preset range.
3. one kind electric discharge regulation circuit, it is characterised in that the electric discharge regulation circuit includes sampling comparison module, cut-in voltage carries
For module, digital source voltage input end and reference voltage input terminal for providing 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 is connected with reference voltage input terminal, and the output end of the sampling comparison module provides the control of module with the cut-in voltage
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 additionally operable to carry to the cut-in voltage when the sampled voltage is less than the reference voltage
The first control signal is provided for the control terminal of module, and the sampling comparison module is additionally operable to be higher than the ginseng in the sampling
The control terminal for providing module when examining voltage to the cut-in voltage provides the second control signal, wherein, the sampled voltage is little
In the voltage of digital source voltage input end, and the voltage positive correlation with digital source voltage input end input, the ginseng
Voltage of the voltage higher than electric discharge trigger signal is examined, and the absolute value of the reference voltage and the difference in voltage of the trigger signal exists
In preset range；
The cut-in voltage provides module and is used for when the control terminal that the cut-in voltage provides module receives the first control signal
The first grid line cut-in voltage is exported, the cut-in voltage provides the control termination that module is additionally operable to provide module in the cut-in voltage
The second grid line cut-in voltage is exported when receiving the second control signal, wherein, the absolute value of the first grid line cut-in voltage is more 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
It is identical.
4. electric discharge regulation circuit according to claim 3, it is characterised in that it is single that the sampling comparison module includes sampling
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 is connected with earth 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 input in the electrode input end of the comparator is less than the ratio
Low level signal is exported during the voltage inputted compared with the negative input of device, and the comparator can be in the negative pole of the comparator
High level signal is exported when the voltage of input input is higher than the voltage that the negative input of the comparator inputs；
The earth terminal provides the second control signal, and the control terminal of the output unit is connected with the output end of the comparator,
The first input end of the output unit is connected with earth terminal, the second input and DC voltage input end of the output unit
It is connected, the output end of the output unit is connected with the control terminal of the cut-in voltage selecting module, and the output unit can
The voltage that the first input end of output unit inputs is exported to the output list when the comparator exports high level signal
The output end of member, the output unit can be defeated by the first of the output unit when the comparator exports low level signal
Enter the first control signal obtained after the voltage processing of end input to export to the output end of the output unit.
5. electric discharge regulation circuit according to claim 4, it is characterised 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 colelctor electrode for going out 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 with it is described defeated
The base electrode for going out triode is connected, and the emitter stage of the output triode is connected with the earth terminal, and the output three
Pole pipe can be when the base electrode of the output triode receives high level signal by the emitter stage and current collection of the output triode
Pole turns on.
6. electric discharge regulation circuit according to claim 4, it is characterised 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
Second end of the 4th resistance is connected with the earth terminal.
7. the electric discharge regulation circuit according to any one in claim 4 to 6, it is characterised in that the cut-in voltage carries
Include control signal input block, selecting unit and voltage regulation unit for module,
The control terminal that the input of the control signal input block provides module with the cut-in voltage is connected, the control letter
Number the first output end of input block is connected with the first control terminal of the selecting unit, and the of the control signal input block
Two output ends are connected with the second control terminal of the selecting unit, and the control signal input block can be defeated by the control signal
Enter the signal output of the input input of unit to the first output end of the control signal input block, and the control signal
Output to the control signal inputs after the signals reverse that input block can input the input of the control signal input block
Second output end of unit；
The first input end of the selecting unit is connected with the second grid line cut-in voltage input, and the of the selecting unit
Two inputs are connected with the output end of the voltage regulation unit, and the output end of the selecting unit adjusts circuit with the electric discharge
Output end be connected, the selecting unit can be when the first control terminal receives the first control signal by the selecting unit
Second input turns on 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 turned on the output end of the selecting unit when stating the first control signal；
The input 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 regulation circuit according to claim 7, it is characterised in that the control signal input block includes anti-phase
Device, the input of the reverser are connected with the input of the control signal input block, the output end of the reverser with
The second output end electrical connection of the control signal input block.
9. electric discharge regulation circuit according to claim 7, it is characterised 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 end of the control signal input block, first choosing
The first pole for selecting transistor is connected with the second grid line cut-in voltage input, the second pole of the first choice transistor with
The output end of the electric discharge regulation circuit is connected, should when the grid of the first choice transistor receives the first control signal
First pole of first choice transistor and the conducting of the second pole, the grid of the first choice transistor receive the second control signal
When, the first pole of the first choice transistor and the second pole disconnect；
The grid of second selection transistor is connected with the first output end of the control signal input block, 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
The output end for stating electric discharge regulation circuit is connected, and when the grid of second selection transistor receives the first control signal, this
First pole of two selection transistors and the conducting of the second pole, the grid of second selection transistor receive the second control signal
When, the first pole of second selection transistor and the second pole disconnect.
10. electric discharge regulation circuit according to claim 7, it is characterised in that the voltage regulation unit includes simulation electricity
Input, the first diode, the second diode, the first storage capacitance, the second storage capacitance and the 3rd storage capacitance are pressed,
The analog voltage input subelement is used to provide analog voltage, the output end of the analog voltage input subelement and institute
The anode for stating the first diode is connected, and is connected with the first end of the 3rd storage capacitance；
The negative electrode of first diode is connected with the anode of second diode, the negative electrode of second diode with it is described
The output end of voltage regulation unit is connected；
Second end of the 3rd electric capacity is connected with the output end of the voltage regulation unit；
The first end of first electric capacity is connected with the earth terminal, the second end of first electric capacity and the voltage-regulation list
The output end of member is connected；
The first end of second electric capacity is connected with the second grid line cut-in voltage input, the second end of second electric capacity
It is connected with the anode of second diode.
11. electric discharge regulation circuit according to claim 10, it is characterised in that the analog voltage input subelement includes
Analog voltage input, the 5th resistance and the 6th resistance, the first end of the 5th resistance are connected with earth terminal, the 5th electricity
Second end of resistance is connected with the output end of analog voltage input subelement, 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, it is characterised in that institute
The electric discharge that stating display device is also included in claim 3 to 11 described in any one adjusts circuit, the electric discharge regulation circuit
Output end is connected with the gate turn-on voltage input 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 |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN107784990A true CN107784990A (en) | 2018-03-09 |
| CN107784990B 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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| CN (1) | CN107784990B (en) |
| WO (1) | WO2019085725A1 (en) |
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| CN114694612A (en) * | 2022-03-23 | 2022-07-01 | Tcl华星光电技术有限公司 | Shutdown discharge circuit and shutdown discharge method |
| 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 |
Also Published As
| Publication number | Publication date |
|---|---|
| CN107784990B (en) | 2019-10-01 |
| WO2019085725A1 (en) | 2019-05-09 |
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