CN106558289A - Liquid crystal indicator and discharge control method - Google Patents
Liquid crystal indicator and discharge control method Download PDFInfo
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- CN106558289A CN106558289A CN201510635849.0A CN201510635849A CN106558289A CN 106558289 A CN106558289 A CN 106558289A CN 201510635849 A CN201510635849 A CN 201510635849A CN 106558289 A CN106558289 A CN 106558289A
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Abstract
A kind of liquid crystal indicator and discharge control method, when the liquid crystal indicator shuts down, charge/discharge control circuit outputs a control signal to source electrode driver and public voltage generator, the source electrode driver stops output gray scale voltage, the a plurality of public electrode wire Jing public voltage generators are grounded, so that the residual charge release of the plurality of pixel electrode.
Description
Technical field
The present invention relates to a kind of liquid crystal indicator and discharge control method.
Background technology
Metal oxide thin-film transistor adopts metal oxide as the channel layer material of thin film transistor (TFT).Channel layer material of the metal oxide thin-film transistor compared to conventionally employed non-crystalline silicon as thin film transistor (TFT) is widely used in liquid crystal indicator with compared with high electron mobility.So, metal oxide thin-film transistor has small leakage current characteristic, and the residual charge when liquid crystal indicator shuts down due to thin film transistor (TFT) cannot discharge, and goes back afterimage, i.e. power off afterimage phenomenon after causing shutdown on liquid crystal indicator.Power off afterimage phenomenon have impact on the quality of liquid crystal indicator.
The content of the invention
In view of this, it is necessary to which a kind of liquid crystal indicator and discharge control method that can be effectively improved power off afterimage phenomenon is provided.
A kind of liquid crystal indicator, including：
Display panels, which includes a plurality of scan line being parallel to each other, a plurality of data wire being parallel to each other, multiple pixel electrodes positioned at the scan line and data wire infall, each pixel electrode includes a metal oxide thin-film transistor, multiple public electrodes and a plurality of public electrode wire being connected with the plurality of public electrode；
Time schedule controller, receives view data and produces clock signal and data-signal；
Gate drivers, receive the clock signal and sequentially export a series of scanning impulses to scan line to open corresponding metal oxide thin-film transistor；
Source electrode driver, receives the clock signal and data-signal and multiple gray scale voltages is exported when corresponding metal oxide thin-film transistor is opened by the plurality of pixel electrode of a plurality of data lines write；
Public voltage generator, for producing common electric voltage output to a plurality of public electrode wire；
And charge/discharge control circuit, when the liquid crystal indicator shuts down, the charge/discharge control circuit outputs a control signal to the source electrode driver and the public voltage generator, the source electrode driver stops output gray scale voltage, the a plurality of public electrode wire Jing public voltage generators are grounded, so that the residual charge release of the plurality of pixel electrode.
Compared to prior art, the liquid crystal indicator of the present invention is in shutdown, charge/discharge control circuit outputs a control signal to the source electrode driver and the public voltage generator, the source electrode driver stops output gray scale voltage, the public voltage generator output no-voltage makes a plurality of public electrode wire ground connection, so that the residual charge release of the plurality of pixel electrode, and then solve the power off afterimage phenomenon of liquid crystal indicator.
Description of the drawings
Fig. 1 is the structural representation of one embodiment of liquid crystal indicator of the present invention.
Fig. 2 is the charge/discharge control circuit schematic diagram of the liquid crystal indicator shown in Fig. 1.
Fig. 3 is signal timing diagram when liquid crystal indicator shown in Fig. 1 is started shooting.
Fig. 4 is the signal timing diagram when liquid crystal indicator shown in Fig. 1 shuts down.
Signal timing diagram when Fig. 5 is the liquid crystal indicator power-off shown in Fig. 1.
Main element symbol description
| Liquid crystal indicator | 10 |
| Liquid crystal panel | 110 |
| Drive circuit | 130 |
| Power supply chip | 150 |
| Public voltage generating circuit | 170 |
| External voltage | VCC |
| Scan line | 102 |
| Data wire | 104 |
| Thin film transistor (TFT) | 108 |
| Pixel electrode | 111 |
| Public electrode | 112 |
| Storage capacitance | 116 |
| Public electrode wire | 118 |
| Public voltage generating circuit | 170 |
| Pixel | 106 |
| Time schedule controller | 132 |
| Gate drivers | 134 |
| Source electrode driver | 136 |
| External circuit | 115 |
| Charge/discharge control circuit | 138 |
| Detecting unit | 1381 |
| Control unit | 1383 |
| Comparator | C1 |
| OR gate | O1 |
Following specific embodiment will further illustrate the present invention with reference to above-mentioned accompanying drawing.
Specific embodiment
Fig. 1 is referred to, Fig. 1 is one embodiment structural representation of liquid crystal indicator of the present invention.The liquid crystal display 10 is a common-black type liquid crystal display, and which includes that a liquid crystal panel 110, is used to driving drive circuit 130, of the liquid crystal panel 110 to be used for and provides the power supply chip 150 of working power, and one is used to the public voltage generating circuit 170 of common electric voltage to be provided for the liquid crystal panel 110 for the drive circuit 130.The power supply chip 150 receives an external voltage VCC as supply voltage.
The liquid crystal panel 110 includes a plurality of scan line 102 being parallel to each other, a plurality of data wire 104 for being parallel to each other and intersect with the multi-strip scanning line 102 insulation, multiple positioned at the scan line 102 and the thin film transistor (TFT) 108 and multiple pixel electrodes 111, multiple public electrodes 112 and multiple storage capacitances 116 of 104 infall of data wire.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 is connected in parallel with the storage capacitance 116.The grid (sign) of the thin film transistor (TFT) 108 is connected to the scan line 102, and source electrode (sign) is connected to the data wire 104, and drain electrode (sign) is connected to the pixel electrode 111.The public electrode 112 is connected to the public voltage generating circuit 170 by public electrode wire 118.The Minimum Area enclosed by scan line 102 and the data wire 104 is defined as a pixel 106.
The drive circuit 130 includes time schedule controller 132, a gate drivers 134 and one source driver 136.The time schedule controller 132 is used to receive the view data that an external circuit 115 is provided, and clock signal and data-signal are produced (such as according to the view data, rgb signal), and be supplied to the source electrode driver 136 and the gate drivers 134 to control the work schedule of the source electrode driver 136 and the gate drivers 134 by the clock signal, and the data-signal is supplied to into the source electrode driver 136.The gate drivers 134 receive the clock signal and sequentially export a series of scanning impulses to the scan line 102.The source electrode driver 136 receives the data-signal and clock signal, and changes the data-signal into multiple gray scale voltages.
Fig. 2 is seen also, Fig. 2 is the charge/discharge control circuit schematic diagram of the liquid crystal indicator shown in Fig. 1.The drive circuit 130 also includes charge/discharge control circuit 138, and the charge/discharge control circuit 138 is connected with the time schedule controller 132, the gate drivers 134 and the source electrode driver 136.The charge/discharge control circuit 138 receives the clock signal of the output of time schedule controller 132, and is controlled by the clock signal.The charge/discharge control circuit 138 includes detecting unit 1381 for detecting whether external voltage VCC has pressure drop, and control unit 1383 is used to output control signals to the gate drivers 134, the source electrode driver 136, the public voltage generator 170 and the power supply chip 150.The detecting unit includes an a comparator C1 and OR gate O1.The positive input of comparator C1 connects a reference voltage Ref, the reverse input end of comparator C1 is connected with external voltage VCC, the output end of comparator C1 and an input of OR gate O1, another input of OR gate O1 receives control signal CT of the output of time schedule controller 132, and the output end of OR gate O1 is connected with the control unit 1383.
Fig. 3 is seen also, Fig. 3 is the signal timing diagram when liquid crystal indicator 10 shown in Fig. 1 is started shooting.
When starting the P1 time periods, i.e., when the on/off button that user presses liquid crystal display 100 is booted up, electricity on the power supply chip 150, as shown in Power signals in Fig. 3.The gate-on signal VGH that the gate drivers 134 are received is low level signal, and grid pick-off signal VGL is high level signal.Gate-on signal VGH is exported by the time schedule controller 132 with the grid pick-off signal VGL.The source electrode driver 136 not outputting data signals Data, the public voltage generator 170 not outputting common voltage Vcom.The input voltage VCC of comparator A1 negative input ends drastically raises to be equal to and be more than rapidly reference voltage Ref, and then comparator A1 exports the first control signal to OR gate O1, OR gate O1 output control signals Gate ON is to the gate drivers 134, and while output control signal Source ON is to the source electrode driver 136.In the present embodiment, the duration of the P1 time periods is 100-200 milliseconds.
Into the P2 time periods, the gate drivers 134 export the gate-on signal VGH and low level grid pick-off signal VGL of high level according to control signal Gate ON, now the plurality of metal oxide thin-film transistor 108 is turned on, the pixel electrode 111 is discharged by the plurality of metal oxide thin-film transistor 108, simultaneously the public voltage generator 170 not outputting common voltage Vcom, i.e., be grounded equivalent to the public electrode wire 118.Now, the public electrode 112 is discharged by the public electrode wire 118.
Into the P3 time periods, the public voltage generator 170 exports Vcom to the public electrode wire 118.The time schedule controller 132 controls the liquid crystal indicator 10 and shows black picture.
Into the P4 time periods, the time schedule controller 132 receives the data-signal of the input of external circuit 115, starts normal output timing signal and data-signal, and the source electrode driver 134 is input into normal data signal Data to the metal oxide thin-film transistor 108.
Fig. 4 is seen also, Fig. 4 is the signal timing diagram when liquid crystal indicator 10 shown in Fig. 1 shuts down.
At the T1 time periods, the liquid crystal indicator 10 shows normal pictures.
When starting the T2 time periods, i.e. when the on/off button that user presses liquid crystal display 100 is shut down, the power supply chip 150, public voltage generating circuit 170 store certain energy including multiple energy-storage travelling wave tubes due to inside, therefore the power supply chip 150, the public voltage generating circuit 170 can't be quit work immediately.Shut down moment in the liquid crystal indicator 10; reference voltage Ref protects constant substantially; and external voltage VCC drastically declines to be equal to and be less than rapidly reference voltage Ref; further; comparator C1 is input into the second control signal to OR gate O1; OR gate O1 further outputs control signals to the control circuit 1383, and 1383 output control signal Gate ON is to the gate drivers 134 for the control circuit, and while output control signal Source ON is to the source electrode driver 136.The source electrode driver 136 exports black picture data under control signal Source ON controls, and now the liquid crystal indicator 10 shows black picture.Gate-on signal VGH is high level signal, and grid pick-off signal VGL is low level signal.170 normal generation common electric voltage Vcom of the public voltage generator.
Into the T3 time periods, grid pick-off signal VGL saltus steps are high level signal, the public voltage generating circuit 170 stopping outputting common voltage Vcom.The control signal Source ON saltus steps of the output of charge/discharge control circuit 138 are low level signal, the stopping outputting data signals of source electrode driver 136.Control signal Gate of the output of charge/discharge control circuit 138
ON saltus steps are low level signal.Now, the liquid crystal capacitance Jing public electrode wires 118 are substantially discharged.
Into the T4 time periods, the power supply signal Power of the power supply chip 150 is zeroed, and the liquid crystal indicator 10 completes power-off operation.
See also Fig. 5, signal timing diagram when Fig. 5 is the liquid crystal indicator power-off shown in Fig. 1.
In the TP1 time periods, when the liquid crystal indicator 10 is forced power-off, the power supply chip 150 makes power supply signal Power slowly decline with certain slope due to inherent protection mechanism.Reference voltage Ref protects constant substantially; and external voltage VCC drastically declines to be equal to and be less than rapidly reference voltage Ref; further; comparator C1 is input into the second control signal to OR gate O1; OR gate O1 further outputs control signals to the control circuit 1383; 1383 output control signal Gate ON is to the gate drivers 134 for the control circuit, and while output control signal Source ON is to the source electrode driver 136.Gate-on signal VGH is high level signal, and grid pick-off signal VGL is low level signal.
In the TP2 time periods, power supply signal Power continues to decline, and grid pick-off signal VGL saltus steps are high level signal, and the gate-on signal VGH and grid pick-off signal VGL starts slow decline within the TP2 time periods.The public voltage generating circuit 170 stops outputting common voltage Vcom.Now, the liquid crystal capacitance Jing public electrode wires 118 are substantially discharged.
Within the TP3 time periods, control signal Source ON saltus steps be low level signal, power supply signal Power continue decline.
Within the TP4 time periods, power supply signal Power zeros, the liquid crystal indicator 10 complete power-off operation.
Under switch on condition, the charge/discharge control circuit controls the public electrode wire and is grounded the liquid crystal indicator of the present invention, so that liquid crystal indicator is substantially discharged by public electrode wire, to solve the start ghost phenomena and power off afterimage phenomenon of liquid crystal indicator.
Although the present invention is disclosed above with embodiment; so which is not limited to the present invention; any those of ordinary skill in the art; without departing from the spirit and scope of the invention; when can make a little change and retouching, thus the protection domain of the present invention when depending on after attached the defined person of claim be defined.
Claims (9)
1. a kind of liquid crystal indicator, including：
Display panels, which includes a plurality of scan line being parallel to each other, a plurality of data wire being parallel to each other, multiple pixel electrodes positioned at the scan line and data wire infall, each pixel electrode includes a metal oxide thin-film transistor, multiple public electrodes and a plurality of public electrode wire being connected with the plurality of public electrode；
Time schedule controller, receives view data and produces clock signal and data-signal；
Gate drivers, receive the clock signal and sequentially export a series of scanning impulses to scan line to open corresponding metal oxide thin-film transistor；
Source electrode driver, receives the clock signal and data-signal and multiple gray scale voltages is exported when corresponding metal oxide thin-film transistor is opened by the plurality of pixel electrode of a plurality of data lines write；
Public voltage generator, for producing common electric voltage output to a plurality of public electrode wire；
And charge/discharge control circuit, when the liquid crystal indicator shuts down, the charge/discharge control circuit outputs a control signal to the source electrode driver and the public voltage generator, the source electrode driver stops output gray scale voltage, the a plurality of public electrode wire Jing public voltage generators are grounded, so that the residual charge release of the plurality of pixel electrode.
2. liquid crystal indicator as claimed in claim 1, it is characterised in that the charge/discharge control circuit is connected with the time schedule controller, the gate drivers and the source electrode driver, the charge/discharge control circuit receive the clock signal of time schedule controller output；The charge/discharge control circuit includes detecting unit for detecting whether external voltage has pressure drop, and control unit is used to output control signals to the gate drivers, the source electrode driver.
3. liquid crystal indicator as claimed in claim 2, it is characterized in that, the detecting unit includes a comparator and an OR gate, the positive input of the comparator connects a reference voltage, the reverse input end of the comparator is connected with external voltage, the output end of the comparator and an input of the OR gate, another input of the OR gate receive the control signal of the time schedule controller output, and the output end of the OR gate is connected with the control unit.
4. liquid crystal indicator as claimed in claim 3, characterized in that, when the on/off button that user presses liquid crystal display is booted up, electricity on the power supply chip, the gate-on signal that the gate drivers are received is low level signal, and grid pick-off signal is high level signal；The gate-on signal is exported by the time schedule controller with the grid pick-off signal；The source electrode is with driver not outputting data signals, the public voltage generator not outputting common voltage, the input voltage of the comparator negative input end drastically raises to be equal to and be more than rapidly the reference voltage, and then the comparator exports the first control signal to the OR gate, the OR gate outputs control signals to the gate drivers, and while outputs control signals to the source electrode driver.
5. liquid crystal indicator as claimed in claim 4, it is characterized in that, gate-on signal and low level grid pick-off signal of the gate drivers according to the control signal output high level, now the plurality of metal oxide thin-film transistor conducting, the pixel electrode is discharged by the plurality of metal oxide thin-film transistor, simultaneously the public voltage generator not outputting common voltage, i.e., be grounded equivalent to the public electrode wire；Now, the public electrode is discharged by the public electrode wire.
6. liquid crystal indicator as claimed in claim 3; it is characterized in that; when the on/off button that user presses liquid crystal display is shut down; shut down moment in the liquid crystal indicator; the reference voltage is protected constant substantially; and the external voltage drastically declines to be equal to and be less than rapidly the reference voltage; further; the comparator is input into the second control signal to the OR gate; the OR gate further outputs control signals to the control circuit; the control circuit output control signal is to the gate drivers, and while outputs control signals to the source electrode driver；The source electrode driver exports black picture data under the control signal control, now the liquid crystal indicator shows black picture, the gate-on signal is high level signal, and the grid pick-off signal is low level signal, and the public voltage generator normally produces common electric voltage.
7. liquid crystal indicator as claimed in claim 6, it is characterized in that, the grid pick-off signal saltus step is high level signal, the public voltage generating circuit stops outputting common voltage, the control signal saltus step of the charge/discharge control circuit output is low level signal, source electrode driver stopping outputting data signals, and the control signal saltus step of charge/discharge control circuit output is low level signal, now, the liquid crystal capacitance Jing public electrode wires are substantially discharged.
8. liquid crystal indicator as claimed in claim 3, it is characterized in that, when the liquid crystal indicator is forced power-off, the power supply signal of the power supply chip is slowly declined with certain slope, the reference voltage is protected constant substantially, and the external voltage drastically declines to be equal to and be less than rapidly the reference voltage, further, the comparator is input into the second control signal to the OR gate, the OR gate further outputs control signals to the control circuit, the control circuit output control signal is to the gate drivers, and while outputing control signals to the source electrode driver, the gate-on signal is high level signal, the grid pick-off signal is low level signal.
9. liquid crystal indicator as claimed in claim 8, it is characterised in that the power supply signal continues to decline, the grid pick-off signal saltus step are high level signal, and the gate-on signal starts slow decline with the grid pick-off signal；The public voltage generating circuit stops outputting common voltage, and now the liquid crystal capacitance Jing public electrode wires are substantially discharged.
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| 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 |
| CN109272967A (en) * | 2018-11-12 | 2019-01-25 | 惠科股份有限公司 | The control method of control circuit, display device and control circuit |
| CN109461422A (en) * | 2018-12-28 | 2019-03-12 | 惠科股份有限公司 | Charge/discharge control circuit and display device |
| CN109658902A (en) * | 2019-03-12 | 2019-04-19 | 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 |
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| 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 |
| CN111025697A (en) * | 2019-12-16 | 2020-04-17 | 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 |
| CN114078454A (en) * | 2020-08-21 | 2022-02-22 | 夏普株式会社 | Display device |
| CN112992097A (en) * | 2021-03-31 | 2021-06-18 | 昆山龙腾光电股份有限公司 | Driving method, driving circuit and 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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