CN106558289B - Liquid crystal display device and discharge control method - Google Patents
Liquid crystal display device and discharge control method Download PDFInfo
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- CN106558289B CN106558289B CN201510635849.0A CN201510635849A CN106558289B CN 106558289 B CN106558289 B CN 106558289B CN 201510635849 A CN201510635849 A CN 201510635849A CN 106558289 B CN106558289 B CN 106558289B
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Abstract
A kind of liquid crystal display device and discharge control method, when liquid crystal display device shutdown, charge/discharge control circuit outputs a control signal to source electrode driver and public voltage generating circuit, the source electrode driver stops output gray scale voltage, a plurality of public electrode wire is grounded through the public voltage generating circuit, so that the residual charge of multiple pixel electrode discharges.
Description
Technical field
The present invention relates to a kind of liquid crystal display device and discharge control methods.
Background technique
Metal oxide thin-film transistor uses channel layer material of the metal oxide as thin film transistor (TFT).Metal oxidation
Channel layer material of the object thin film transistor (TFT) compared to conventionally employed amorphous silicon as thin film transistor (TFT) has compared with high electron mobility
And it is widely used in liquid crystal display device.So, metal oxide thin-film transistor has small leakage current characteristic, works as liquid
Since the residual charge of thin film transistor (TFT) can not discharge when crystal device shuts down, cause also residual on liquid crystal display device after shutting down
Picture picture, i.e. power off afterimage phenomenon.Power off afterimage phenomenon affects the quality of liquid crystal display device.
Summary of the invention
In view of this, it is necessary to provide liquid crystal display device and electric discharge controls that one kind can be effectively improved power off afterimage phenomenon
Method processed.
A kind of liquid crystal display device, comprising:
Liquid crystal display panel comprising a plurality of scan line being parallel to each other, a plurality of data line being parallel to each other, it is multiple to be located at
The pixel electrode of the scan line and data line infall, each pixel electrode includes a metal oxide thin-film transistor, multiple
Public electrode and a plurality of public electrode wire being connect with multiple public electrode；
Sequence controller receives image data and generates timing control signal and data-signal；
Gate drivers receive the timing control signal and sequentially export a series of scanning pulses to scan line to open phase
The metal oxide thin-film transistor answered；
Source electrode driver receives the timing control signal and data-signal and in corresponding metal oxide thin-film transistor
Multiple gray scale voltages are exported when unlatching, and multiple pixel electrode is written by the multiple data lines；
Public voltage generating circuit is output to a plurality of public electrode wire for generating common voltage；
Power supply chip receives external voltage；
And charge/discharge control circuit, with the sequence controller, the gate drivers, the source electrode driver and the power supply chip
It is electrically connected；The charge/discharge control circuit receives the external voltage that the timing control signal and the power supply chip provide；This is put
Electric control circuit includes detecting unit and control unit；The detecting unit is for detecting whether the external voltage has pressure drop；This is detectd
Surveying unit includes a comparator and one or door, positive input one reference voltage of connection of the comparator, the comparator it is reversed
Input terminal is connected with the external voltage, the output end of the comparator with should or an input terminal of door be connected, this or door it is another defeated
Enter end and receive the timing control signal, is somebody's turn to do or the output end of door is connect with the control unit；The liquid crystal display device be switched on
And in shutdown process, one control signal of comparator output, is somebody's turn to do or door is logical according to the timing control signal and the control signal
Grid control signal of the control unit output in high level is crossed to the gate drivers, so that multiple pixel electrode is residual
It stays charge to discharge, and exports the source control signal in high level to the source electrode driver, so that the liquid crystal display device is aobvious
Show black picture.
Compared to the prior art, during shutdown, charge/discharge control circuit output controls signal to liquid crystal display device of the invention
To the source electrode driver and the public voltage generating circuit, which stops output gray scale voltage, which produces
Raw circuit output no-voltage makes a plurality of public electrode wire ground connection, so that the residual charge of multiple pixel electrode discharges, in turn
Solve the power off afterimage phenomenon of liquid crystal display device.
Detailed description of the invention
Fig. 1 is the structural schematic diagram of one embodiment of liquid crystal display device of the present invention.
Fig. 2 is the charge/discharge control circuit schematic diagram of liquid crystal display device shown in FIG. 1.
Signal timing diagram when Fig. 3 is the booting of liquid crystal display device shown in Fig. 1.
Signal timing diagram when Fig. 4 is liquid crystal display device shown in FIG. 1 shutdown.
Signal timing diagram when Fig. 5 is liquid crystal display device shown in FIG. 1 power-off.
Main element symbol description
The present invention that the following detailed description will be further explained with reference to the above drawings.
Specific embodiment
Referring to Fig. 1, Fig. 1 is one embodiment structure schematic diagram of liquid crystal display device of the present invention.The liquid crystal display device
10 be a common-black type liquid crystal display comprising a liquid crystal display panel 110, one is used to drive the driving circuit of the liquid crystal display panel 110
130, one for being that the driving circuit 130 provides the power supply chip 150 and one of working power for being the liquid crystal display panel 110
The public voltage generating circuit 170 of common voltage is provided.The power supply chip 150 receives an external voltage VCC as supply voltage.
The liquid crystal display panel 110 include a plurality of scan line 102 being parallel to each other, it is a plurality of be parallel to each other and with the multi-strip scanning line
Data line 104, the multiple thin film transistor (TFT)s 108 positioned at the scan line 102 and 104 infall of data line of 102 insulation intersections
With multiple pixel electrodes 111, multiple public electrodes 112 and multiple storage capacitances 116.The pixel electrode 111, the public electrode
112 and therebetween liquid crystal molecule (not shown) constitute multiple liquid crystal capacitances 114.The liquid crystal capacitance 114 and the storage capacitance
116 are connected in parallel.The grid (not indicating) of the thin film transistor (TFT) 108 is connected to the scan line 102, and source electrode (not indicating) is connected to
The data line 104, drain electrode (not indicating) are connected to the pixel electrode 111.The public electrode 112 is connected by public electrode wire 118
It is connected to the public voltage generating circuit 170.The Minimum Area that the scan line 102 and the data line 104 are enclosed is defined as a pixel
106。
The driving circuit 130 includes time schedule controller 132, a gate drivers 134 and one source driver 136.It should
Sequence controller 132 is used to receive the image data of an external circuit 115 offer, and generates clock signal according to the image data
With data-signal (e.g., rgb signal), and by the clock signal be supplied to the source electrode driver 136 and the gate drivers 134 with
The working sequence of the source electrode driver 136 and the gate drivers 134 is controlled, and the data-signal is supplied to the source electrode and is driven
Dynamic device 136.The gate drivers 134 receive the clock signal and sequentially export a series of scanning pulses to the scan line 102.It should
Source electrode driver 136 receives the data-signal and clock signal, and converts the data-signal as multiple gray scale voltages.
Referring to Figure 2 together, Fig. 2 is the charge/discharge control circuit schematic diagram of liquid crystal display device shown in FIG. 1.Driving electricity
Road 130 further includes charge/discharge control circuit 138, the charge/discharge control circuit 138 and the sequence controller 132, the gate drivers 134
And the source electrode driver 136 connection.The charge/discharge control circuit 138 receives the timing control signal of the sequence controller 132 output
CT, and controlled by timing control signal CT.The charge/discharge control circuit 138 includes detecting unit 1381 for detecting the external electrical
Whether pressure VCC has pressure drop and control unit 1383 for outputing control signals to the gate drivers 134, the source electrode driver
136, the public voltage generating circuit 170 and the power supply chip 150.The detecting unit includes a comparator C1 and one or door O1.
The positive input of comparator C1 connects a reference voltage Ref, reverse input end and the external voltage VCC phase of comparator C1
Company, the output end of comparator C1 and an input terminal of this or door O1, are somebody's turn to do or another input terminal of door O1 receives the timing control
The timing control signal CT that device 132 exports, is somebody's turn to do or the output end of door O1 is connect with the control unit 1383.
Also referring to the signal timing diagram that Fig. 3, Fig. 3 are when liquid crystal display device 10 shown in FIG. 1 is switched on.
When the P1 period starts, i.e., when the power on/off button that user presses liquid crystal display 100 boots up,
The power supply chip 150 powers on, as shown in Power signal in Fig. 3.The received gate-on signal VGH of the gate drivers 134 is
Low level signal, grid pick-off signal VGL are high level signal.Gate-on signal VGH and the grid pick-off signal VGL by
The sequence controller 132 output.The source electrode driver 136 not outputting data signals Data, the public voltage generating circuit 170 is not
Outputting common voltage Vcom.The external voltage VCC of comparator C1 negative input end is sharply increased to be equal to and rapidly greater than the ginseng
Voltage Ref is examined, and then comparator C1 output first control signal is extremely somebody's turn to do or door O1, is somebody's turn to do or door O1 passes through the control unit 1383
The grid control signal Gate ON in high level is exported to the gate drivers 134.In the present embodiment, the P1 time
The duration of section is 100-200 milliseconds.
Into the P2 period, which exports the gate turn-on of high level according to control signal Gate ON
Signal VGH and low level grid pick-off signal VGL, multiple metal oxide thin-film transistor 108 is connected at this time, the pixel
Electrode 111 is discharged by multiple metal oxide thin-film transistor 108, while the public voltage generating circuit 170 does not export
Common voltage Vcom, that is, the public electrode wire 118 is grounded.At this point, the public electrode 112 passes through the public electrode wire
118 electric discharges.
Into the P3 period, it is somebody's turn to do or door O1 passes through source control signal of the control unit 1383 output in high level
For Source ON to the source electrode driver 136, which exports Vcom to the public electrode wire 118.It should
Sequence controller 132 controls the liquid crystal display device 10 and shows black picture.
Into the P4 period, which receives the data-signal of the external circuit 115 input, starts normal
Output timing signal and data-signal, the source electrode driver 136 input normal data signal Data to the metal-oxide film
Transistor 108.
Referring to Figure 4 together, signal timing diagram when Fig. 4 is liquid crystal display device 10 shown in FIG. 1 shutdown.
In the T1 period, which shows normal pictures.
When the T2 period starts, i.e., when the power on/off button that user presses liquid crystal display 100 shuts down,
The power supply chip 150, public voltage generating circuit 170 store certain energy including multiple energy-storage travelling wave tubes due to internal,
The power supply chip 150, the public voltage generating circuit 170 can't stop working immediately.It shuts down in the liquid crystal display device 10
Moment, reference voltage Ref are held essentially constant, and external voltage VCC sharply declines to be equal to and rapidly less than the reference
Voltage Ref, in turn, comparator C1 input second control signal is extremely somebody's turn to do or door O1, is somebody's turn to do or door O1 further passes through the control list
1383 grid control signal Gate ON of the output in high level of member is to the gate drivers 134, and output simultaneously is in height
The source control signal Source ON of level is to the source electrode driver 136.The source electrode driver 136 is controlled in the source electrode to be believed
The lower black picture data of output of number Source ON control, the liquid crystal display device 10 shows black picture at this time.The gate-on signal
VGH is high level signal, which is low level signal.The public voltage generating circuit 170 normally generates public
Common voltage Vcom.
Into the T3 period, grid pick-off signal VGL jump is high level signal, the public voltage generating circuit 170
Stop outputting common voltage Vcom.The source control signal Source ON jump of the charge/discharge control circuit 138 output is low electricity
Ordinary mail number, the source electrode driver 136 stop outputting data signals.The grid control signal of the charge/discharge control circuit 138 output
Gate ON jump is low level signal.At this point, the liquid crystal capacitance is substantially discharged through the public electrode wire 118.
Into the T4 period, the power supply signal Power of the power supply chip 150 is zeroed, which completes to close
Machine operation.
Please refer to fig. 5, signal timing diagram when Fig. 5 is liquid crystal display device shown in FIG. 1 power-off.
In the TP1 period, when which is forced power-off, the power supply chip 150 is due to inherent protection machine
It makes and declines power supply signal Power slowly with certain slope.Reference voltage Ref is held essentially constant, and the external electrical
Pressure VCC sharply declines to be equal to and be less than reference voltage Ref rapidly, and in turn, comparator C1 inputs second control signal extremely
This or door O1, this or door O1 further pass through the control unit 1383 and export grid control signal Gate ON to grid drive
Dynamic device 134, and source control signal Source ON is exported simultaneously to the source electrode driver 136.Gate-on signal VGH
For high level signal, which is low level signal.
In the TP2 period, power supply signal Power continues to decline, and grid pick-off signal VGL jump is that high level is believed
Number, and gate-on signal VGH and the grid pick-off signal VGL started slowly to decline within the TP2 period.The common electrical
Generation circuit 170 is pressed to stop outputting common voltage Vcom.At this point, the liquid crystal capacitance is substantially discharged through the public electrode wire 118.
Within the TP3 period, source control signal Source ON jump is low level signal, power supply signal Power
Continue to decline.
Within the TP4 period, power supply signal Power zero, the liquid crystal display device 10 completes power-off operation.
For liquid crystal display device of the invention under switch on condition, which controls public electrode wire ground connection,
To make liquid crystal display device be substantially discharged by public electrode wire, to solve the booting ghost phenomena of liquid crystal display device and close
Machine ghost phenomena.
Although the present invention has been disclosed by way of example above, it is not intended to limit the present invention., any technical field
Middle tool usually intellectual, without departing from the spirit and scope of the invention, when can make it is a little change and retouch, therefore it is of the invention
Protection scope after view subject to attached claim institute defender.
Claims (7)
1. a kind of liquid crystal display device, comprising:
Liquid crystal display panel comprising a plurality of scan line being parallel to each other, a plurality of data line being parallel to each other, it is multiple to be swept positioned at this
The pixel electrode of line Yu data line infall is retouched, each pixel electrode includes a metal oxide thin-film transistor, multiple public
Electrode and a plurality of public electrode wire being connect with multiple public electrode；
Sequence controller receives image data and generates timing control signal and data-signal；
Gate drivers receive the timing control signal and sequentially export a series of scanning pulses to scan line to open accordingly
Metal oxide thin-film transistor；
Source electrode driver receives the timing control signal and data-signal and opens in corresponding metal oxide thin-film transistor
When export multiple gray scale voltages multiple pixel electrode be written by the multiple data lines；
Public voltage generating circuit is output to a plurality of public electrode wire for generating common voltage；
Power supply chip receives external voltage；
And charge/discharge control circuit, it is electrical with the sequence controller, the gate drivers, the source electrode driver and the power supply chip
Connection；The charge/discharge control circuit receives the external voltage that the timing control signal and the power supply chip provide；The electric discharge control
Circuit processed includes detecting unit and control unit；The detecting unit is for detecting whether the external voltage has pressure drop；The detecting list
Member connects a reference voltage, the reversed input of the comparator including a comparator and one or door, the positive input of the comparator
End is connected with the external voltage, and the output end of the comparator is connected with an input terminal of this or door, another input terminal of this or door
The timing control signal is received, is somebody's turn to do or the output end of door is connect with the control unit；It is switched on and closes in the liquid crystal display device
During machine, one control signal of comparator output, should or door according to the timing control signal and the control signal by should
Grid control signal of the control unit output in high level is to the gate drivers, so that the residual electricity of multiple pixel electrode
Lotus release, the and export source control signal in high level to the source electrode driver so that the liquid crystal display device show it is black
Picture.
2. liquid crystal display device as described in claim 1, which is characterized in that when user presses opening for the liquid crystal display device
When machine/shutdown button boots up, the liquid crystal display device work include first time period, second time period, the third period with
And the 4th period, in the first time period, the received gate-on signal of the gate drivers is low level signal, and grid is cut
Stop signal is high level signal；The gate-on signal is exported with the grid pick-off signal by the sequence controller；The source electrode drives
Dynamic device not outputting data signals, the public voltage generating circuit not outputting common voltage, the input electricity of the comparator negative input end
It presses and sharply increases to be equal to and rapidly greater than the reference voltage, and then comparator output first control signal is extremely somebody's turn to do or door, it should
Or door passes through the grid control signal of control unit output in high level to the gate drivers.
3. liquid crystal display device as claimed in claim 2, which is characterized in that in the second time period, the gate drivers root
The gate-on signal and low level grid pick-off signal of high level are exported according to the grid control signal in high level, this
When the conducting of multiple metal oxide thin-film transistor, which is put by multiple metal oxide thin-film transistor
Electricity, while the public voltage generating circuit not outputting common voltage, that is, the public electrode wire is grounded；At this point, this is public
Electrode is discharged by the public electrode wire；In the third period, it is somebody's turn to do or door is according to the first control signal and the timing control
Signal exports the source control signal in high level to the source electrode driver, the liquid crystal display device by the control unit
Show black picture；In the 4th period, which receives the data-signal of external circuit input and via the source electrode
Driver inputs to the metal oxide thin-film transistor.
4. liquid crystal display device as described in claim 1, which is characterized in that when user presses opening for liquid crystal display device
When machine/shutdown button is shut down, the liquid crystal display device work include first time period, second time period, the third period with
And the 4th period；In the first time period, which shows normal pictures；In the second time period, the reference
Voltage is held essentially constant, and the external voltage sharply declines to be equal to and rapidly less than the reference voltage, in turn, the comparator
Input second control signal is extremely somebody's turn to do or door, is somebody's turn to do or door further passes through the grid control that control unit output is in high level
Signal to the gate drivers, and simultaneously the source control signal of output in high level to the source electrode driver；The source electrode
Driver exports black picture data under the source control signal control in high level, and the liquid crystal display device is shown at this time
Black picture, the gate drivers according in high level the grid control signal output high level gate-on signal with it is low
The grid pick-off signal of level, the public voltage generating circuit normally generate common voltage.
5. liquid crystal display device as claimed in claim 4, which is characterized in that in the third period, the grid pick-off signal
Jump is high level signal, which stops outputting common voltage, the source of charge/discharge control circuit output
It is low level signal that pole, which controls signal jump, which stops outputting data signals, charge/discharge control circuit output
Grid control signal jump is low level signal, at this point, the pixel electrode is substantially discharged through the public electrode wire；The 4th
Period, the liquid crystal display device complete power-off operation.
6. liquid crystal display device as described in claim 1, which is characterized in that, should when the liquid crystal display device is forced power-off
The power supply signal of power supply chip is slowly declined with certain slope, which is held essentially constant, and the external voltage is sharply
Decline be equal to and rapidly be less than the reference voltage, in turn, the comparator input second control signal to should or door, be somebody's turn to do or door into
By the grid control signal of control unit output in high level to the gate drivers, and simultaneously, output is in one step
The source control signal of high level to the source electrode driver, gate drivers control letter according to the grid in high level
Number output high level gate-on signal and low level grid pick-off signal.
7. liquid crystal display device as claimed in claim 6, which is characterized in that the power supply signal continues to decline, grid cut-off
Signal jump is high level signal, and the gate-on signal starts slowly to decline with the grid pick-off signal；The common voltage
Generation circuit stops outputting common voltage, and the pixel electrode is substantially discharged through the public electrode wire at this time.
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| CN201510635849.0A CN106558289B (en) | 2015-09-30 | 2015-09-30 | Liquid crystal display device and discharge control method |
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| CN201510635849.0A CN106558289B (en) | 2015-09-30 | 2015-09-30 | Liquid crystal display device and discharge control method |
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| CN107369419A (en) * | 2017-08-08 | 2017-11-21 | 昆山龙腾光电有限公司 | Liquid crystal display device and its driving method |
| CN107886922A (en) * | 2017-12-08 | 2018-04-06 | 南京中电熊猫平板显示科技有限公司 | Liquid crystal display device and the method for improving liquid crystal display device power down splashette |
| CN108172184A (en) * | 2018-01-02 | 2018-06-15 | 京东方科技集团股份有限公司 | Shutdown discharge circuit and display module |
| CN108717333A (en) * | 2018-03-05 | 2018-10-30 | 广东欧珀移动通信有限公司 | Display control unit, control method, the terminal device of display screen |
| 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 |
| CN109272967B (en) | 2018-11-12 | 2020-07-07 | 惠科股份有限公司 | Control circuit, display device, and control method of control circuit |
| CN109461422B (en) * | 2018-12-28 | 2020-12-29 | 惠科股份有限公司 | Discharge control circuit and display device |
| CN109658902B (en) * | 2019-03-12 | 2019-05-28 | 南京中电熊猫平板显示科技有限公司 | Liquid crystal display device and the method and electronic equipment for improving panel flash |
| CN109872698B (en) * | 2019-04-12 | 2021-07-23 | Tcl华星光电技术有限公司 | Common electrode discharge circuit, source electrode drive circuit and common electrode discharge method |
| CN111025697B (en) * | 2019-12-16 | 2021-06-01 | 武汉华星光电技术有限公司 | Liquid crystal display panel and display device |
| CN111161661A (en) * | 2020-01-02 | 2020-05-15 | 京东方科技集团股份有限公司 | Display device and starting control circuit, method and system of display panel of display device |
| US20220059046A1 (en) * | 2020-08-21 | 2022-02-24 | Sharp Kabushiki Kaisha | Display device |
| CN112992097B (en) * | 2021-03-31 | 2022-09-20 | 昆山龙腾光电股份有限公司 | Driving method, driving circuit and display device |
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