CN108121094A - The shutdown charging method and circuit of a kind of liquid crystal display panel - Google Patents
The shutdown charging method and circuit of a kind of liquid crystal display panel Download PDFInfo
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- CN108121094A CN108121094A CN201711321009.2A CN201711321009A CN108121094A CN 108121094 A CN108121094 A CN 108121094A CN 201711321009 A CN201711321009 A CN 201711321009A CN 108121094 A CN108121094 A CN 108121094A
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- G—PHYSICS
- G02—OPTICS
- G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
- G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
- G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour
- G02F1/13—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour based on liquid crystals, e.g. single liquid crystal display cells
- G02F1/133—Constructional arrangements; Operation of liquid crystal cells; Circuit arrangements
- G02F1/13306—Circuit arrangements or driving methods for the control of single liquid crystal cells
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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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- Crystallography & Structural Chemistry (AREA)
- Engineering & Computer Science (AREA)
- General Physics & Mathematics (AREA)
- Nonlinear Science (AREA)
- Computer Hardware Design (AREA)
- Theoretical Computer Science (AREA)
- Mathematical Physics (AREA)
- Optics & Photonics (AREA)
- Control Of Indicators Other Than Cathode Ray Tubes (AREA)
Abstract
The present invention provides a kind of shutdown charging method of liquid crystal display panel and circuit, this method comprise the following steps：When liquid crystal display panel starts shutdown, the signal in scan line is maintained in set period of time, and maintains the current potential of the input terminal of the PCBA circuit boards of liquid crystal display panel processed；In set period of time, the data-signal on data cable is adjusted, by the potential difference brought between pixel electrode in liquid crystal display panel and color membrane substrates public electrode in the range of setting voltage difference so that liquid crystal display panel shows black picture；After set period of time, control liquid crystal display panel starts to discharge.The present invention will not allow user to observe that the shutdown of liquid crystal display panel is shown bad when liquid crystal display panel shuts down.
Description
Technical field
The present invention relates to display technology field more particularly to the shutdown charging methods and circuit of a kind of liquid crystal display panel.
Background technology
In current information-intensive society, and TFT-LCD (hin film transistor-liquid crystal display, it is thin
Film transistor liquid crystal display) panel has been widely used for the various aspects of our lives, mobile phone from small size, camera shooting
Machine, digital camera, laptop, the desktop computer of middle size, large-sized domestic TV to large-scale projector equipment etc., TFT-
LCD panel is on the basis of light, thin advantage, in addition perfect picture and quick response characteristic, it is ensured that it is in monitor market
On come out top.
In active matrix liquid crystal display device, each pixel has there are one thin film transistor (TFT) (TFT), grid
(gate) it is connected to the scan line of horizontal direction, drain electrode (drain) is connected to the data cable of vertical direction, and source electrode (source)
Pixel electrode is then connected to, each pixel further includes the color membrane substrates public electrode opposite with pixel electrode.
In same scan line in the horizontal direction, the grid of all thin film transistor (TFT)s all links together, so applying
Voltage be to interlock, if applying sufficiently large positive voltage in a certain scan line, all film is brilliant in this scan line
Body pipe can all be opened, at this time the pixel electrode in this scan line, can be connected with the data cable of vertical direction, and via data
Line is sent into corresponding vision signal, and pixel electrode is charged to appropriate voltage, then applies sufficiently large negative voltage, closes
Thin film transistor (TFT) re-writes signal again until next time, therebetween so that charge is stored on liquid crystal capacitance.Restart secondary one at this time
Horizontal scanning line, is sent into its corresponding vision signal.So sequentially the video data of entire picture is write, then again from the
One re-writes signal (general frequency that this is repeated is 60~70Hz), pel array such as Fig. 1 institutes in liquid crystal display panel
Show, CK (n) is nth bar clock signal in Fig. 1, and G (n-1), G (n), G (n+1) are respectively (n-1)th grade of signal, n-th grade of grid
Pole signal and (n+1)th grade of signal, the corresponding n-th grade of GOA of G (n) (Gate driver On Array, the driving of array substrate row
Technology) circuit unit output terminal, VSS is constant pressure low level signal, and LC1 and LC2 are low-frequency clock signal, thin film transistor (TFT)
The grade that T11 accesses (n-1)th grade of GOA circuit passes signal output part ST (n-1), and one end of thin film transistor (TFT) T22 is as n-th grade of GOA
The grade of circuit passes signal output part ST (n).
Using GOA liquid crystal display panels to illustrate object, single-stage GOA circuit units such as Fig. 2 institutes in GOA liquid crystal display panels
Show.Herein, we pay close attention to emphatically circuit sequence when liquid crystal display panel shuts down, and the usual means used in industry are as follows：
Detection module (level shift) monitors the voltage swing of the input terminal (input) of PCBA circuit boards always, in LCD display
After plate performs shutdown action, the input terminal (input) of PCBA circuit boards can generate power down phenomenon (such as from 12V to 0V), work as inspection
When the voltage value measured is less than preset value, star t-up discharge function makes whole signals in liquid crystal display panel be pulled to height
Current potential is rapidly performed by discharging action in order to pixel.But when pixel star t-up discharge function, the institute in liquid crystal display panel
There is signal that should all be pulled to high potential, for GOA liquid crystal display panels so that the condition that signal is drawn high is institute
Some CK signals (clock signal) remain high potential, thus CK signals will carry the unlatching control of entire liquid crystal display panel
System, can cause CK signal loads excessive, and then cause signal that can not all be pulled to high potential, so as to can not effectively open
The pixel of entire liquid crystal display panel, thus the discharge process meeting last longer of liquid crystal display panel, observe user
Shutdown electric discharge display is bad.
The content of the invention
In order to solve the above technical problems, the present invention provides a kind of the shutdown charging method and circuit of liquid crystal display panel,
When liquid crystal display panel shuts down, user will not be allowed to observe that the shutdown of liquid crystal display panel is shown bad, improve liquid crystal display
The quality of panel.
A kind of shutdown charging method of liquid crystal display panel provided by the invention, comprises the following steps：
When liquid crystal display panel starts shutdown, the signal in scan line is maintained in set period of time, and is maintained
The current potential of the input terminal of the PCBA circuit boards of liquid crystal display panel processed；
In the set period of time, adjust data cable on data-signal, by pixel electrode in liquid crystal display panel with
Potential difference brought between color membrane substrates public electrode is in the range of setting voltage difference so that liquid crystal display panel shows black picture
Face；
After the set period of time, control liquid crystal display panel starts to discharge.
Preferably, in the set period of time, the data-signal on data cable is adjusted, by pixel in liquid crystal display panel
Potential difference brought between electrode and color membrane substrates public electrode is in the range of setting voltage difference, specially：
The data-signal on data cable is adjusted, control data cable exports black picture signal to the pixel electrode, and by institute
State color membrane substrates public electrode current potential maintain liquid crystal display panel shutdown before state so that the pixel electrode with it is described
Potential difference between color membrane substrates public electrode shows the corresponding maximum pixel of black rank picture no more than the liquid crystal display panel
Pressure difference.
Preferably, in the set period of time, the data-signal on data cable is adjusted, by pixel in liquid crystal display panel
Potential difference brought between electrode and color membrane substrates public electrode is in the range of setting voltage difference, specially：
The public voltage signal on the color membrane substrates public electrode is adjusted, drags down the electricity of the color membrane substrates public electrode
Position, and adjust the picture element signal on the pixel electrode so that between the pixel electrode and the color membrane substrates public electrode
Potential difference show the corresponding maximum pixel pressure difference of black rank picture no more than the liquid crystal display panel.
Preferably, the set period of time is no more than the duration that liquid crystal display panel scans two frame pictures.
Preferably, after set period of time, control liquid crystal display panel starts to discharge, and is specially：
After the set period of time, the input terminal of the PCBA circuit boards is controlled to start power down, and described in monitoring
The voltage of the input terminal of PCBA circuit boards, will when the voltage value of the input terminal of the PCBA circuit boards is less than setting voltage value
Signal in scan line is pulled to high potential, and the pixel for opening liquid crystal display panel starts to discharge.
Preferably, the signal in scan line is pulled to high potential, is specially：
The clock signal that the GOA circuits of liquid crystal display panel are accessed is pulled to high potential, by GOA circuit outputs to right
The signal of scan line is answered to be pulled to high potential.
The present invention also provides a kind of shutdown discharge circuit of liquid crystal display panel, including：Detection module, off delay module
And signal control module；
The detection module, for monitoring the input terminal potential of PCBA circuit boards in liquid crystal display panel, and described
When the input terminal potential of PCBA circuit boards is less than setting voltage value, the liquid crystal display panel is controlled to discharge；
The off delay module, for monitoring whether the liquid crystal display panel shuts down, when the liquid crystal display panel
During shutdown, the input terminal potential of the signal and the PCBA circuit boards in scan line is maintained in set period of time；
Signal control module, in the postboost set period of time of the liquid crystal display panel, adjusting on data cable
Data-signal, the potential difference brought between the pixel electrode in liquid crystal display panel and color membrane substrates public electrode is being set
Within the scope of constant voltage difference so that liquid crystal display panel shows black picture.
Preferably, the detection module is pulled to high electricity by the clock signal for accessing GOA circuits in liquid crystal display panel
Position, is pulled to high potential, the pixel for opening liquid crystal display panel is discharged by the signal of GOA circuit outputs.
Preferably, the set period of time is no more than the duration that liquid crystal display panel scans two frame pictures.
Implement the present invention, have the advantages that：When liquid crystal display panel shuts down, liquid crystal display panel is first maintained
Circuit sequence maintains the current potential of the input terminal of PCBA circuit boards that is, in set period of time, prevents the pixel of liquid crystal display panel
Start to discharge, maintain the signal in scan line, ensure that the thin film transistor (TFT) in the pixel of liquid crystal display panel is opened, then lead to
Overregulate the data-signal on data cable so that liquid crystal display panel shows black picture, is liquid crystal after set period of time
The discharge process meeting last longer of display panel, user will not observe that shutdown electric discharge display is bad.
Description of the drawings
It in order to illustrate more clearly about the embodiment of the present invention or technical scheme of the prior art, below will be to embodiment or existing
There is attached drawing needed in technology description to be briefly described, it should be apparent that, the accompanying drawings in the following description is only this
Some embodiments of invention, for those of ordinary skill in the art, without creative efforts, can be with
Other attached drawings are obtained according to these attached drawings.
Fig. 1 is the schematic diagram of pel array in liquid crystal display panel provided by the invention.
Fig. 2 is the schematic diagram of single-stage GOA circuit units in liquid crystal display panel provided by the invention.
Fig. 3 is the functional block diagram of the shutdown discharge circuit of liquid crystal display panel provided by the invention.
Fig. 4 is the flow chart of the shutdown charging method of liquid crystal display panel provided by the invention.
Fig. 5 is the sequence diagram that shuts down in the first embodiment of the shutdown charging method of liquid crystal display panel provided by the invention.
Fig. 6 is the sequence diagram that shuts down in the second embodiment of the shutdown charging method of liquid crystal display panel provided by the invention.
Specific embodiment
The present invention provides a kind of shutdown discharge circuit 1 of liquid crystal display panel, which is arranged in liquid crystal display panel,
As shown in figure 3, the circuit includes：Detection module 11, off delay module 12 and signal control module 13.
Detection module 11 is used to monitor the input terminal potential of PCBA circuit boards in liquid crystal display panel, and in PCBA circuit boards
Input terminal potential be less than setting voltage value when, control liquid crystal display panel discharge.Include power supply on PCBA circuit boards
Integrated circuit (Power Management IC, PMIC) is managed, detection module 11 can monitor power management integrated circuit input
The current potential at end, when power management integrated circuit input terminal potential is less than setting voltage value, control liquid crystal display panel is put
Electricity.Power management integrated circuit is used to manage the electric energy in liquid crystal display panel.PCBA circuit boards are the upper electronic component of welding
Wiring board.
Off delay module 12, when liquid crystal display panel shuts down, is setting for monitoring whether liquid crystal display panel shuts down
The input terminal potential of the signal and PCBA circuit boards in the scan line of liquid crystal display panel is maintained in section of fixing time so that
The input terminal potential of signal and PCBA circuit boards in scan line is consistent with before shutdown.
Signal control module 13 is used in the postboost set period of time of liquid crystal display panel, adjusts the number on data cable
It is believed that number, by the potential difference brought between the pixel electrode in liquid crystal display panel and color membrane substrates public electrode in setting electricity
In pressure differential range so that liquid crystal display panel shows black picture.
Liquid crystal display panel further includes the scan line of a plurality of parallel interval, the data cable of a plurality of parallel interval, multiple cascades
GOA circuit units, as shown in Figure 1, multi-strip scanning line Gate is mutually perpendicular to a plurality of data lines Data, be divided into multiple arrays
Pixel.The GOA circuit units of single-stage are as shown in Figure 2.
Further, detection module 11 is pulled to high electricity by the clock signal for accessing GOA circuits in liquid crystal display panel
Position, is pulled to high potential, the pixel for opening liquid crystal display panel is discharged by the signal of GOA circuit outputs.
More specifically, after set period of time, off delay module 12 is stopped, the signal in liquid crystal display panel
Low potential is all dropped to, when the current potential of the input terminal of PCBA circuit boards is less than setting voltage value, detection module 11 draws high GOA circuits
The current potential of the signal of unit output, so as to which pixel thin film transistor be opened, starts to discharge.
Further, set period of time is no more than the duration that liquid crystal display panel scans two frame pictures.
The present invention also provides a kind of shutdown charging method of liquid crystal display panel, as shown in figure 4, comprising the following steps：
When liquid crystal display panel starts shutdown, the signal in scan line is maintained in set period of time, makes grid
Signal is consistent with before liquid crystal display panel shutdown, and maintains the current potential of the input terminal of the PCBA circuit boards of liquid crystal display panel processed；
In set period of time, the data-signal on data cable is adjusted, by pixel electrode in liquid crystal display panel and color film
Potential difference brought between substrate public electrode is in the range of setting voltage difference so that liquid crystal display panel shows black picture, i.e.,
Liquid crystal between pixel electrode and color membrane substrates public electrode does not occur effectively to deflect；
After set period of time, control liquid crystal display panel starts to discharge.
Signal and data-signal are clock signal.
It can be by off delay module 12 in setting time in the shutdown charging method of the liquid crystal display panel of the present invention
The signal sequential in scan line is maintained in section, the pixel discharge of liquid crystal display panel can be controlled by detection module 11.
Further, in set period of time, the data-signal on data cable is adjusted, by pixel electricity in liquid crystal display panel
Potential difference brought between pole and color membrane substrates public electrode is in the range of setting voltage difference, specially：
The data-signal on data cable is adjusted, control data cable exports black picture signal to pixel electrode, and by color film base
The current potential of plate public electrode maintains the state before liquid crystal display panel shutdown so that pixel electrode and color membrane substrates public electrode
Between potential difference show the corresponding maximum pixel pressure difference of black rank picture no more than liquid crystal display panel, such as pixel electrode with it is color
Potential difference between ilm substrate public electrode is no more than 2V and not less than -2V.
Further, the corresponding voltage range of black picture signal is no more than 9V and not less than 5V, and color membrane substrates are public at this time
The current potential of common electrode maintains 7V.
Further, in set period of time, the data-signal on data cable is adjusted, by pixel electricity in liquid crystal display panel
Potential difference brought between pole and color membrane substrates public electrode is in the range of setting voltage difference, specially：
The public voltage signal on color membrane substrates public electrode is adjusted, the current potential of color membrane substrates public electrode is dragged down, and adjusts
Save the picture element signal on pixel electrode so that the potential difference between pixel electrode and color membrane substrates public electrode is no more than liquid crystal
Show the corresponding maximum pixel pressure difference of the black rank picture of Display panel, such as the current potential between pixel electrode and color membrane substrates public electrode
Difference is no more than 2V and not less than -2V.
Further, set period of time is no more than the duration that liquid crystal display panel scans two frame pictures.
Further, after set period of time, control liquid crystal display panel starts to discharge, and is specially：
After set period of time, the input terminal of the PCBA circuit boards of liquid crystal display panel is controlled to start power down, and is monitored
The voltage of the input terminal of the PCBA circuit boards of liquid crystal display panel, when the voltage value of the input terminal of PCBA circuit boards is less than setting electricity
During pressure value, the signal in scan line is pulled to high potential, the pixel for opening liquid crystal display panel starts to discharge.
Further, the signal in scan line is pulled to high potential, is specially：
The clock signal that the GOA circuits of liquid crystal display panel are accessed is pulled to high potential, by GOA circuit outputs to right
The signal of scan line is answered to be pulled to high potential.
As shown in figure 5, in the first embodiment of the shutdown charging method of liquid crystal display panel, liquid crystal is performed at the t1 moment
The shutdown action of display panel, at the same time, off delay module 12 is started to work, and maintains GOA circuits in liquid crystal display panel
Sequential and current potential and shutdown before it is consistent, power down phenomenon will not occur for the input terminal of PCBA circuit boards.
The moment from t1 to t2, liquid crystal display panel off delay module 12 times keep GOA circuit sequences it is constant (such as
For t1 to the t2 moment, the signal sequential of scan line Gate is consistent with before shutdown), wherein, the corresponding time at t1 moment is works as
The start-up time of the current horizontal scanning line of previous frame (i.e. N-1 frames, N >=2), corresponding time at t2 moment are next frame (i.e. nth frame)
The close moment of last column scan line, herein, t1 are to ensure LCD display to this period between the t2 moment
The corresponding pixel of all horizontal scanning lines can effectively be charged to black picture signal in plate.
In t1 into this period between the t2 moment, scan line Gate is normally opened and closed, data cable Data outputs
(voltage value of black picture signal is the corresponding voltage values of gamma7 and gamma8, gamma7 and gamma8 pairs for black picture signal
The voltage answered is ties up voltage), keep on color membrane substrates public voltage signal CFcom initial potential constant (i.e. and liquid crystal display
Current potential before panel shutdown is identical), herein for example, the corresponding voltage of gamma7, gamma8 is usually 6V, 8V, CFcom
Corresponding voltage is usually 7V, and the definition of pixel pressure difference is the difference of the two, i.e. ± 1V, pixel pressure difference for ± 1V when, pixel
Liquid crystal molecule between electrode and color membrane substrates public electrode can not realize effective deflection, thus dark-state display effect is presented in picture
Fruit, that is, black picture.
After next frame last column scan line is closed, i.e., after the t2 moment, the current potential of CFcom will be pulled low to a certain moment
Low potential is denoted as CFcoml, herein, since there are capacitive coupling works between color membrane substrates public electrode and pixel electrode
With when the current potential of CFcom is pulled low, the current potential of pixel electrode can be also pulled low, but pixel pressure difference can't occur substantially to become
Change, that is, maintain ± 1V or so, thus entire picture is still black picture.
Subsequent 12 power cut-off of off delay module, the input terminal of PCBA circuit boards can generate power down phenomenon (i.e. PCBA electricity
The voltage of the input terminal of road plate drops to 0V from 12V), when the input terminal voltage value for the PCBA circuit boards that detection module 11 detects
Less than setting voltage value when star t-up discharge function, make whole signals in liquid crystal display panel be pulled to high potential in order to
Pixel is rapidly performed by discharging action, herein, discharges in black picture, even if the inconsistency that there is electric discharge will not be by
User observes that display is bad.Here, setting voltage value can be 7V or so, such as 7V~7.5V.
As shown in fig. 6, in a second embodiment, in first embodiment difference lies in：
At present frame (i.e. N-1 frames), after liquid crystal display panel performs shutdown action, off delay module 12 can be
Maintain in certain period of time in liquid crystal display panel circuit sequence and current potential (such as in t1 to t2 moment, scan line Gate's
Signal sequential is consistent with before shutdown), but the current potential of color membrane substrates public voltage signal CFcom will be pulled low to certain moment
One low potential is denoted as CFcom l.
Correspondingly, in order to maintain pixel pressure difference, for ± 1V or so, the black picture signal of data cable output no longer uses
The corresponding voltage value of gamma7, gamma8, but the voltage value labeled as B1, B2 is used, meet B1-CFcom=1V, B2-
CFcom=-1V.
In addition, the duration of 2 frames is up to for the off delay time in first embodiment and second embodiment, such as
Sequential of shutting down faster in order to obtain is needed, it can be by the pass of the current horizontal scanning line of the time advance of t2 to next frame (i.e. nth frame)
The moment is closed, at this point, the off delay time is the duration of 1 frame.
In conclusion it is of the invention by when liquid crystal display panel shuts down, first maintaining the circuit sequence of liquid crystal display panel,
The current potential of the input terminal of PCBA circuit boards is maintained i.e. in set period of time, prevents the pixel of liquid crystal display panel from starting to discharge,
The signal in scan line is maintained, ensures that the thin film transistor (TFT) in the pixel of liquid crystal display panel is opened, then by adjusting number
According to the data-signal on line so that liquid crystal display panel shows black picture, is liquid crystal display panel after set period of time
Discharge process can last longer, user will not observe shutdown electric discharge display it is bad.
The above content is a further detailed description of the present invention in conjunction with specific preferred embodiments, it is impossible to assert
The specific implementation of the present invention is confined to these explanations.For those of ordinary skill in the art to which the present invention belongs, exist
On the premise of not departing from present inventive concept, several simple deduction or replace can also be made, should all be considered as belonging to the present invention's
Protection domain.
Claims (9)
1. the shutdown charging method of a kind of liquid crystal display panel, which is characterized in that comprise the following steps：
When liquid crystal display panel starts shutdown, the signal in scan line is maintained in set period of time, and maintains liquid processed
The current potential of the input terminal of the PCBA circuit boards of LCD panel；
In the set period of time, the data-signal on data cable is adjusted, by pixel electrode in liquid crystal display panel and color film
Potential difference brought between substrate public electrode is in the range of setting voltage difference so that liquid crystal display panel shows black picture；
After the set period of time, control liquid crystal display panel starts to discharge.
2. the shutdown charging method of liquid crystal display panel according to claim 1, which is characterized in that in the setting time
In section, the data-signal on data cable is adjusted, it will be between pixel electrode in liquid crystal display panel and color membrane substrates public electrode
Potential difference brought is in the range of setting voltage difference, specially：
The data-signal on data cable is adjusted, control data cable exports black picture signal to the pixel electrode, and by the coloured silk
The current potential of ilm substrate public electrode maintains the state before liquid crystal display panel shutdown so that the pixel electrode and the color film
Potential difference between substrate public electrode shows the corresponding maximum pixel pressure difference of black rank picture no more than the liquid crystal display panel.
3. the shutdown charging method of liquid crystal display panel according to claim 1, which is characterized in that in the setting time
In section, the data-signal on data cable is adjusted, it will be between pixel electrode in liquid crystal display panel and color membrane substrates public electrode
Potential difference brought is in the range of setting voltage difference, specially：
The public voltage signal on the color membrane substrates public electrode is adjusted, drags down the current potential of the color membrane substrates public electrode,
And adjust the picture element signal on the pixel electrode so that the electricity between the pixel electrode and the color membrane substrates public electrode
Potential difference shows the corresponding maximum pixel pressure difference of black rank picture no more than the liquid crystal display panel.
4. the shutdown charging method of liquid crystal display panel according to claim 1, which is characterized in that the set period of time
No more than the duration that liquid crystal display panel scans two frame pictures.
5. the shutdown charging method of liquid crystal display panel according to claim 1, which is characterized in that by set period of time
Afterwards, control liquid crystal display panel starts to discharge, and is specially：
After the set period of time, the input terminal of the PCBA circuit boards is controlled to start power down, and monitor the PCBA electricity
The voltage of the input terminal of road plate, when the voltage value of the input terminal of the PCBA circuit boards is less than setting voltage value, by scan line
On signal be pulled to high potential, the pixel for opening liquid crystal display panel starts to discharge.
6. the shutdown charging method of liquid crystal display panel according to claim 5, which is characterized in that by the grid in scan line
Pole signal is pulled to high potential, is specially：
The clock signal that the GOA circuits of liquid crystal display panel are accessed is pulled to high potential, GOA circuit outputs to correspondence are swept
The signal for retouching line is pulled to high potential.
7. a kind of shutdown discharge circuit of liquid crystal display panel, which is characterized in that including：Detection module, off delay module with
And signal control module；
The detection module, for monitoring the input terminal potential of PCBA circuit boards in liquid crystal display panel, and in PCBA electricity
When the input terminal potential of road plate is less than setting voltage value, the liquid crystal display panel is controlled to discharge；
The off delay module, for monitoring whether the liquid crystal display panel shuts down, when the liquid crystal display panel shuts down
When, the input terminal potential of signal and the PCBA circuit boards in set period of time in maintenance scan line；
Signal control module, in the postboost set period of time of the liquid crystal display panel, adjusting the number on data cable
It is believed that number, by the potential difference brought between the pixel electrode in liquid crystal display panel and color membrane substrates public electrode in setting electricity
In pressure differential range so that liquid crystal display panel shows black picture.
8. the shutdown discharge circuit of liquid crystal display panel according to claim 7, which is characterized in that the detection module leads to
It crosses and the clock signal that GOA circuits in liquid crystal display panel access is pulled to high potential, the signal of GOA circuit outputs is drawn
To high potential, the pixel for opening liquid crystal display panel is discharged.
9. the shutdown discharge circuit of liquid crystal display panel according to claim 7, which is characterized in that the set period of time
No more than the duration that liquid crystal display panel scans two frame pictures.
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| CN109192164A (en) * | 2018-10-10 | 2019-01-11 | 惠科股份有限公司 | Display device and its method for eliminating shutdown ghosting image |
| CN109509445A (en) * | 2018-12-19 | 2019-03-22 | 惠科股份有限公司 | Eliminate the method and device of power-off ghost shadow on panel |
| CN109509448A (en) * | 2018-12-19 | 2019-03-22 | 惠科股份有限公司 | Eliminate the method and device of power-off ghost shadow on panel |
| CN111613173A (en) * | 2019-02-23 | 2020-09-01 | 华为技术有限公司 | Display driving system, display module, driving method of display screen and electronic equipment |
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| CN111613173A (en) * | 2019-02-23 | 2020-09-01 | 华为技术有限公司 | Display driving system, display module, driving method of display screen and electronic equipment |
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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 |
| CN114863856A (en) * | 2022-04-25 | 2022-08-05 | 武汉天马微电子有限公司 | Display panel driving method and display device |
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