CN109872698A - Public electrode discharge circuit, source electrode drive circuit and public electrode charging method - Google Patents
Public electrode discharge circuit, source electrode drive circuit and public electrode charging method Download PDFInfo
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- CN109872698A CN109872698A CN201910296142.XA CN201910296142A CN109872698A CN 109872698 A CN109872698 A CN 109872698A CN 201910296142 A CN201910296142 A CN 201910296142A CN 109872698 A CN109872698 A CN 109872698A
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- public electrode
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Abstract
The present invention relates to a kind of public electrode discharge circuit, source electrode drive circuit and public electrode charging methods.The public electrode discharge circuit includes: comparator and switching tube；The supply voltage (VDD) of the inverting input terminal connection source electrode drive circuit of the comparator, the non-inverting input terminal of the comparator connects the threshold voltage (V1) that pixel electrode after preset power supply is closed starts supply voltage (VDD) when electric discharge, the output end of the comparator connects the control terminal of the switching tube, the first end of the switching tube connects public electrode, and the second end of the switching tube connects data signal line.The present invention also provides corresponding source electrode drive circuit and public electrode charging methods.The present invention specially devises a public electrode discharge circuit, it can be integrated in inside source electrode drive circuit, for power supply close when, public electrode and pixel electrode discharge simultaneously, can improve pixel electrode and public electrode as the velocity of discharge it is inconsistent caused by screen flicker.
Description
Technical field
The present invention relates to field of display technology more particularly to a kind of public electrode discharge circuits, source electrode drive circuit and public affairs
Common electrode charging method.
Background technique
In recent years, liquid crystal display device (Liquid Crystal Display, LCD) suffers from widely in numerous areas
Using, and continue that quick growth trend is presented.With the improvement of actuation techniques, with low-power consumption, slim amount is light, low electricity
The advantages that pressure driving, it is widely applied to shot with video-corder, laptop, desktop display device and various throwings at present
In shadow equipment.
Usually there is gate driving circuit, source electrode drive circuit and pixel array in liquid crystal display device.In pixel array
With multiple pixel circuits, each pixel circuit is opened and closed according to the scanning signal that gate driving circuit provides, and according to
According to the data-signal that source electrode drive circuit provides, data display is shown.
The dot structure of liquid crystal display panel generally by pixel electrode, public electrode (public electrode voltages VCOM), be connected to number
It is constituted according to the thin film transistor (TFT) (TFT) and liquid crystal capacitance and storage capacitance of signal wire and gate line.Liquid crystal molecule is in grid
Under the control of pole signal, the electric field formed on liquid crystal capacitance is respectively applied to by pixel electrode and public electrode to control liquid crystal
The rotation angle of molecule, realizes the display of single liquid crystal pixel.Storage capacitance is mainly swept in gate drive signal line by line
The normal display in one frame time of lastrow image is kept when retouching.
General liquid crystal display can enter electric discharge (discharge) function, i.e. source after power supply closes (power off)
The output (output) of pole driving circuit (Driver IC) drags down, and all gate lines (gate line) can be pulled upward to height
Voltage VGH, thin film transistor (TFT) is opened, pixel electrode repid discharge.And public electrode is due to no special discharge circuit, institute
It is slower to discharge.Certain cramping is formd between pixel electrode and public electrode, liquid crystal is in certain time after causing power supply to be closed
It is interior to be in twisted state, it, can if backlight is in the open state or extraneous when having illumination to be mapped to the surface liquid crystal cell (cell)
See screen flicker.
Summary of the invention
Therefore, the purpose of the present invention is to provide a kind of public electrode discharge circuit, source electrode drive circuit and public electrodes
Charging method, public electrode discharges simultaneously with pixel electrode when power supply being enable to close.
To achieve the above object, the present invention provides a kind of public electrode discharge circuits, comprising: comparator and switching tube；
The supply voltage of the inverting input terminal connection source electrode drive circuit of the comparator, the non-inverting input terminal connection of the comparator are pre-
If power supply close after pixel electrode start electric discharge when supply voltage threshold voltage, the comparator output end connection described in
The control terminal of switching tube, the first end of the switching tube connect public electrode, and the second end of the switching tube connects data-signal
Line.
Wherein, the switching tube is triode.
Wherein, the triode is NPN type triode.
Wherein, the output end of the comparator connects the base stage of the NPN type triode, the collection of the NPN type triode
Electrode connects public electrode, and the emitter of the NPN type triode connects data signal line.
The present invention also provides a kind of source electrode drive circuits, including aforementioned described in any item public electrode discharge circuits.
The present invention also provides a kind of public electrode charging methods, comprising:
Step 10, when electrical power is off, gate line current potential is raised, and data signal line current potential is pulled low, pixel electricity
It is discharged by data signal line pole；Meanwhile the supply voltage of source electrode drive circuit is begun to decline；
Step 20, the inverting input terminal of comparator connect the supply voltage of the source electrode drive circuit, the same phase of comparator
Input terminal connects the threshold voltage that pixel electrode after preset power supply is closed starts supply voltage when electric discharge, the output end of comparator
The control terminal of connection switch pipe；When comparator judges that the supply voltage of source electrode drive circuit drops to threshold voltage, output control
Signal processed controls the switching tube and opens；
Step 30, the first end of the switching tube connect public electrode, and the second end of the switching tube connects data-signal
Line, when the switching tube is opened, the public electrode is discharged by data signal line.
Wherein, the switching tube is triode.
Wherein, the triode is NPN type triode.
Wherein, the output end of the comparator connects the base stage of the NPN type triode, the collection of the NPN type triode
Electrode connects public electrode, and the emitter of the NPN type triode connects data signal line.
To sum up, public electrode discharge circuit of the invention, source electrode drive circuit and public electrode charging method specially design
One public electrode discharge circuit, can be integrated in inside source electrode drive circuit, when being closed for power supply, public electrode and picture
Plain electrode discharges simultaneously, can improve pixel electrode and public electrode as the velocity of discharge it is inconsistent caused by screen flicker.
Detailed description of the invention
With reference to the accompanying drawing, by the way that detailed description of specific embodiments of the present invention, technical solution of the present invention will be made
And other beneficial effects are apparent.
In attached drawing,
Fig. 1 is the circuit diagram of one preferred embodiment of public electrode discharge circuit of the present invention；
Fig. 2 is the application schematic diagram of one preferred embodiment of source electrode drive circuit of the present invention.
Specific embodiment
It is the circuit diagram of one preferred embodiment of public electrode discharge circuit of the present invention referring to Fig. 1.The public electrode
Discharge circuit specifically includes that comparator and NPN type triode T6；The inverting input terminal of the comparator connects source electrode drive circuit
Supply voltage VDD, the non-inverting input terminal of the comparator connects pixel electrode after preset power supply is closed and starts electricity when electric discharge
The threshold voltage V1 of source voltage VDD, the base stage B of the output end connecting triode T6 of the comparator, the collector C of triode T6
Public electrode is connected, the emitter E of triode T6 connects data signal line.It will be understood by those skilled in the art that in other realities
It applies in example, triode T6 can also be replaced using other kinds of switching tube.
Based on circuit shown in Fig. 1, public electrode charging method of the invention may be implemented, this method specifically includes that
Step 10, when electrical power is off, gate line current potential is raised, and data signal line current potential is pulled low, pixel electricity
It is discharged by data signal line pole；Meanwhile the supply voltage VDD of source electrode drive circuit is begun to decline；This step is existing picture
Plain electrode discharge process.
Step 20, the inverting input terminal of comparator connect the supply voltage VDD of the source electrode drive circuit, comparator it is same
Phase input terminal connects the threshold voltage V1 that pixel electrode after preset power supply is closed starts supply voltage VDD when electric discharge, comparator
Output end connection switch pipe control terminal；When comparator judges that the supply voltage VDD of source electrode drive circuit drops to threshold value electricity
When pressing V1, output control signal controls the switching tube and opens；In this step, switching tube specifically uses triode T6.
Step 30, the first end of switching tube connect public electrode, and the second end of the switching tube connects data signal line, when
When the switching tube is opened, the public electrode is discharged by data signal line.When switching tube specifically uses triode T6, by
For circuit shown in Fig. 1 it is found that as VDD > V1, the base stage B of triode T6 is low level, triode T6 cut-off；As VDD < V1,
The base stage B of triode T6 is high level, and triode T6 is connected, at this time since data signal line current potential is pulled low, public electrode meeting
Discharged by data signal line, so as to improve pixel electrode and public electrode as the velocity of discharge it is inconsistent caused by screen flash
Phenomenon.
Referring to fig. 2, it is the application schematic diagram of one preferred embodiment of source electrode drive circuit of the present invention, illustrates of the invention
Application of the source electrode drive circuit in available liquid crystal panel, the source electrode drive circuit may include public electrode electric discharge electricity above-mentioned
Public electrode discharge circuit above-mentioned is integrated in inside source electrode drive circuit by road.As shown in Fig. 2, the pixel knot of liquid crystal display panel
Structure generally by pixel electrode 1, public electrode (not shown), the thin film transistor (TFT) 2 for being connected to data signal line and gate line,
And liquid crystal capacitance (not shown) and storage capacitance (not shown) are constituted, source electrode drive circuit connects data signal line, is showing
When, source electrode drive circuit carries out data-signal output to liquid crystal display panel by data signal line.It, will be public in this preferred embodiment
Common electrode discharge circuit (specific structure can be as shown in Figure 1) is integrated in existing source electrode drive circuit.
For the liquid crystal display panel for applying source electrode drive circuit of the present invention, when electrical power is off when, gate line
Current potential is raised, and data signal line current potential is pulled low, and pixel electrode is discharged by data signal line；Meanwhile source electrode drive circuit
Supply voltage VDD drop to pixel electrode start electric discharge threshold voltage V1 hereinafter, by source electrode drive circuit embed public affairs
Common electrode discharge circuit, public electrode can discharge through data signal line, so as to improve pixel electrode and public electrode due to putting
Screen flicker caused by electric speed is inconsistent.
To sum up, public electrode discharge circuit of the invention, source electrode drive circuit and public electrode charging method specially design
One public electrode discharge circuit, can be integrated in inside source electrode drive circuit, when being closed for power supply, public electrode and picture
Plain electrode discharges simultaneously, can improve pixel electrode and public electrode as the velocity of discharge it is inconsistent caused by screen flicker.
The above for those of ordinary skill in the art can according to the technique and scheme of the present invention and technology
Other various corresponding changes and modifications are made in design, and all these change and modification all should belong to the appended right of the present invention
It is required that protection scope.
Claims (9)
1. a kind of public electrode discharge circuit characterized by comprising comparator and switching tube；The reverse phase of the comparator is defeated
Enter the supply voltage (VDD) of end connection source electrode drive circuit, the non-inverting input terminal of the comparator connects preset power supply and closes
Pixel electrode starts the threshold voltage (V1) of supply voltage (VDD) when electric discharge afterwards, opens described in the output end connection of the comparator
The control terminal of pipe is closed, the first end of the switching tube connects public electrode, and the second end of the switching tube connects data signal line.
2. public electrode discharge circuit as described in claim 1, which is characterized in that the switching tube is triode.
3. public electrode discharge circuit as claimed in claim 2, which is characterized in that the triode is NPN type triode.
4. public electrode discharge circuit as claimed in claim 3, which is characterized in that described in the output end connection of the comparator
The collector of the base stage of NPN type triode, the NPN type triode connects public electrode, the emitter of the NPN type triode
Connect data signal line.
5. a kind of source electrode drive circuit, which is characterized in that including the described in any item public electrode electric discharges of such as Claims 1 to 4
Circuit.
6. a kind of public electrode charging method characterized by comprising
Step 10, when electrical power is off, gate line current potential is raised, and data signal line current potential is pulled low, and pixel electrode is logical
Cross data signal line electric discharge；Meanwhile the supply voltage (VDD) of source electrode drive circuit is begun to decline；
Step 20, the inverting input terminal of comparator connect the supply voltage (VDD) of the source electrode drive circuit, the same phase of comparator
Input terminal connects the threshold voltage (V1) that pixel electrode after preset power supply is closed starts supply voltage (VDD) when electric discharge, compares
The control terminal of the output end connection switch pipe of device；When comparator judges that the supply voltage (VDD) of source electrode drive circuit drops to threshold
When threshold voltage (V1), output control signal controls the switching tube and opens；
Step 30, the first end of the switching tube connect public electrode, and the second end of the switching tube connects data signal line, when
When the switching tube is opened, the public electrode is discharged by data signal line.
7. public electrode charging method as claimed in claim 6, which is characterized in that the switching tube is triode.
8. public electrode charging method as claimed in claim 7, which is characterized in that the triode is NPN type triode.
9. public electrode charging method as claimed in claim 8, which is characterized in that described in the output end connection of the comparator
The collector of the base stage of NPN type triode, the NPN type triode connects public electrode, the emitter of the NPN type triode
Connect data signal line.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201910296142.XA CN109872698B (en) | 2019-04-12 | 2019-04-12 | Common electrode discharge circuit, source electrode drive circuit and common electrode discharge method |
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| CN201910296142.XA CN109872698B (en) | 2019-04-12 | 2019-04-12 | Common electrode discharge circuit, source electrode drive circuit and common electrode discharge method |
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| CN109872698A true CN109872698A (en) | 2019-06-11 |
| CN109872698B CN109872698B (en) | 2021-07-23 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US11749209B1 (en) | 2022-06-30 | 2023-09-05 | HKC Corporation Limited | Drive circuit, display assembly, and display device |
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| CN1924647A (en) * | 2005-08-30 | 2007-03-07 | 三星电子株式会社 | Liquid crystal display device, module for driving the same and method of driving the same |
| CN101140744A (en) * | 2006-09-07 | 2008-03-12 | 恩益禧电子股份有限公司 | Liquid crystal display device and drive circuit |
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| CN109872698B (en) | 2021-07-23 |
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Address after: 9-2 Tangming Avenue, Guangming New District, Shenzhen City, Guangdong Province Applicant after: TCL Huaxing Photoelectric Technology Co.,Ltd. Address before: 9-2 Tangming Avenue, Guangming New District, Shenzhen City, Guangdong Province Applicant before: Shenzhen China Star Optoelectronics Technology Co.,Ltd. |
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