CN101661714A - Liquid crystal display device and driving method thereof - Google Patents
Liquid crystal display device and driving method thereof Download PDFInfo
- Publication number
- CN101661714A CN101661714A CN200810141761A CN200810141761A CN101661714A CN 101661714 A CN101661714 A CN 101661714A CN 200810141761 A CN200810141761 A CN 200810141761A CN 200810141761 A CN200810141761 A CN 200810141761A CN 101661714 A CN101661714 A CN 101661714A
- Authority
- CN
- China
- Prior art keywords
- liquid crystal
- data voltage
- image data
- subframe
- frame
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
Images
Abstract
The invention provides a liquid crystal display device, which comprises a liquid crystal panel and a data driver, wherein the data driver drives the liquid crystal panel to perform display. The liquidcrystal display device further comprises plug-in gray data generating circuit which outputs a plug-in gray data voltage to a data driving circuit. Each frame of the liquid crystal display device comprises a first subframe and a second subframe. The data driving circuit outputs an image data voltage at the first subframe, outputs the plug-in gray data voltage at the second subframe and drives theliquid crystal panel, and the plug-in gray data voltage of the current frame has the same polarity as that of the image data voltage of the next frame. The liquid crystal display device can eliminatethe phenomenon of blurred images during reverse driving. The invention simultaneously provides a driving method of the liquid crystal display device.
Description
Technical field
The present invention relates to a kind of liquid crystal indicator and driving method thereof.
Background technology
At present, liquid crystal indicator be widely used in desktop computer, personal digital assistant (Personal Digital Assistant, PDA), mobile phone, TV and multiple office automation and audio-visual equipment.The principle of liquid crystal indicator is to apply electric field in the both sides of liquid crystal layer, and liquid crystal molecule is deflected, thereby cooperates the intensity of polaroid control transmitted light to realize that picture shows again.Polarized under same direction effect of electric field for a long time for preventing liquid crystal molecule, influence the response speed and the deflection angle of liquid crystal molecule, the general employing applies the positive and negative alternately type of drive of electric field, i.e. inversion driving mode to liquid crystal layer.
See also Fig. 1, it is the circuit block diagram of a kind of liquid crystal indicator of prior art, and this liquid crystal indicator 10 comprises a liquid crystal panel 11, scan driving circuit 12 and a data drive circuit 14.This liquid crystal panel 11 comprises a plurality of pixels 13, and each pixel 13 comprises a storage capacitors (figure does not show).This scan drive circuit 12 is connected this liquid crystal panel 11 with this data drive circuit 14, and these scan drive circuit 12 output scanning signals scan these a plurality of pixels 13.This data drive circuit 14 according to the control signal of external circuit input to these liquid crystal panel 16 output image data voltages.When this sweep signal is opened these a plurality of pixels 13, this image data voltage is input in these a plurality of storage capacitors, when this sweep signal is closed these a plurality of pixels 13, this image data voltage is stored in these a plurality of storage capacitors, and is substituted by new image data voltage when these a plurality of pixels 13 are opened next time.
See also Fig. 2, it is the driving voltage waveform figure of liquid crystal indicator shown in Figure 1.This data drive circuit 14 is according to shows signal, output cathode image data voltage and negative polarity image data voltage successively, and the polarity that makes each frame image data voltage that these a plurality of pixels 13 receive all polarity with the image data voltage of former frame is opposite.That is, the image data voltage of former frame is a positive polarity, and then the image data voltage of back one frame is a negative polarity.
Yet, when this image data voltage is changed to negative polarity or when negative polarity was changed to positive polarity, because the change in voltage amplitude is bigger, the image data voltage of a back frame that causes easily was to this storage capacitors undercharge from positive polarity.Therefore, when this liquid crystal indicator 10 showed, last picture can influence back one picture,, the phenomenon of fuzzy pictures occurs that is.
Summary of the invention
In order to solve the problem that there is fuzzy pictures in the prior art liquid crystal indicator, be necessary to provide a kind of liquid crystal indicator that can eliminate fuzzy pictures.
Simultaneously, be necessary to provide a kind of driving method of above-mentioned liquid crystal indicator.
A kind of liquid crystal indicator, it comprises a liquid crystal panel and a data driver, this liquid crystal panel of this data driver drive shows.This liquid crystal indicator further comprises a Plug Grey data generating circuit, and it exports a Plug Grey data voltage to this data drive circuit.Each frame of this liquid crystal indicator comprises one first subframe and one second subframe.This data drive circuit is exported an image data voltage in this first subframe, exports this Plug Grey data voltage in this second subframe, drives this liquid crystal panel.And the Plug Grey data voltage of present frame is identical with the polarity of the image data voltage of next frame.
A kind of liquid crystal indicator, it comprises a liquid crystal panel and a data driver, this data driver is exported one first frame image data voltage and one second this liquid crystal panel of frame image data driven.This liquid crystal indicator further comprises a Plug Grey data generating circuit, and this Plug Grey data generating circuit is by this data driver, and output one Plug Grey data voltage is to this liquid crystal panel between this first frame image data voltage and this second frame image data voltage.The polarity of this Plug Grey data voltage is identical with the polarity of this second frame image data voltage.
Compared with prior art, above-mentioned liquid crystal indicator comprises a Plug Grey data generating circuit, it exports a Plug Grey data voltage to this liquid crystal panel between two frame image data voltages, and the polarity of this Plug Grey data voltage is identical with the polarity of the image data voltage of next frame.Therefore, when this Plug Grey data voltage was changed to the next frame image data voltage, its change in voltage amplitude was less.Then the charging of the image data voltage of next frame is faster, reduces the influence of former frame picture to back one frame picture, eliminates the fuzzy pictures phenomenon of this liquid crystal indicator.
A kind of liquid crystal display apparatus driving circuit, it may further comprise the steps:
A) scan a liquid crystal panel in first subframe, and export an image data voltage and drive this liquid crystal panel;
B) scan this liquid crystal panel in second subframe, and export a Plug Grey data voltage and drive this liquid crystal panel, wherein, this Plug Grey data voltage is identical with the image data voltage polarity of next subframe.
Compared with prior art, above-mentioned liquid crystal display apparatus driving circuit is exported an image data voltage in first subframe, export a Plug Grey data voltage in second subframe, drive this liquid crystal panel, and this Plug Grey data voltage is identical with the image data voltage polarity of next frame.Therefore, be changed to this next frame image data voltage from this Plug Grey data voltage, its change in voltage amplitude is less.Then the charging of the image data voltage of next frame is faster, can reduce the influence of former frame picture to back one frame picture, eliminates the fuzzy pictures phenomenon of this liquid crystal indicator.
Description of drawings
Fig. 1 is the circuit block diagram of a kind of liquid crystal indicator of prior art.
Fig. 2 is the driving voltage waveform figure of liquid crystal indicator shown in Figure 1.
Fig. 3 is the circuit block diagram of liquid crystal indicator first embodiment of the present invention.
Fig. 4 is the driving voltage waveform figure of liquid crystal indicator 20 shown in Figure 3.
Fig. 5 is the local circuit block diagram of liquid crystal indicator second embodiment of the present invention.
Fig. 6 is the driving voltage waveform figure of the liquid crystal indicator of second embodiment shown in Figure 5.
Embodiment
See also Fig. 3, it is the circuit block diagram of liquid crystal indicator first embodiment of the present invention.This liquid crystal indicator 20 comprises a liquid crystal panel 21, scan driving circuit 22, a data drive circuit 23 and a Plug Grey data generating circuit 26.
This liquid crystal panel 21 comprises multi-strip scanning line 211 and many data lines 212, and this multi-strip scanning line 211 and many data lines 212 define a plurality of pixels 214.Each pixel comprises a thin film transistor (TFT) 213 and a pixel electrode 215, and the grid of this thin film transistor (TFT) 213 connects this sweep trace 211, and its source electrode connects this data line 212, and its drain electrode connects this pixel electrode 215.The liquid crystal layer (figure does not show) that this pixel electrode 215 and a public electrode (figure does not show), one are clipped between this two electrode constitutes liquid crystal capacitance.This public electrode connects a stable reference voltage, and when the voltage on this pixel electrode 215 changed, the voltage difference at these liquid crystal capacitance two ends also changed, thereby changes the optically-active effect of this liquid crystal layer, shows different pictures.
This scan drive circuit 22 connects this multi-strip scanning line 211, and it is used for this liquid crystal panel 21 output scanning signals are scanned these a plurality of pixels 214.
This Plug Grey data generating circuit 26 connects this data drive circuit 23, and it comprises a voltage generator 261 and a selector switch 262.This voltage generator 261 is used to produce the Plug Grey data voltage of two kinds of opposed polarities (positive polarity or negative polarity), and these two kinds of Plug Grey data voltages are outputed to this selector switch 262.
The signal generation device of one outside (figure do not show) produces the image data voltage of two kinds of opposed polarities (positive polarity or negative polarity), and one of them outputs to this selector switch 262 with the image data voltage of these two kinds of opposed polarities.This selector switch 262 receives these two kinds of Plug Grey data voltages and these image data voltages, selects one of them and the opposite polarity Plug Grey data voltage of this image data voltage, and this image data voltage and this Plug Grey data voltage are outputed to this data drive circuit 23.
This data drive circuit 23 connects this many data lines 212, and it exports this image data voltage and this Plug Grey data voltage in these a plurality of pixels 214, drives this liquid crystal panel 21 respectively and realizes pictures demonstrations.
See also Fig. 4, it is the driving voltage waveform figure of liquid crystal indicator 20 shown in Figure 3.G1 represents that to Gn sweep signal on the multi-strip scanning line 211, Vd represent the image data voltage and the Plug Grey data voltage of these data drive circuit 23 outputs.The time of each frame is divided into one first equal subframe t1 and one second subframe t2.This data drive circuit 23 is exported this image data voltage at this first subframe t1, and t2 exports this Plug Grey data voltage in this second subframe.
In this first subframe t1, this scan drive circuit 20 produces a plurality of sweep signals continuously, and apply these a plurality of sweep signals successively to each sweep trace 211, and in this sweep signal scan period, delegation's thin film transistor (TFT) 213 conductings that are connected with the sweep trace 211 that is scanned.This data drive circuit 23 is applied to this image data voltage by this data line 212 source electrode of the thin film transistor (TFT) 213 of each conducting simultaneously, this image data voltage is sent to this pixel electrode 215 by the drain electrode of this thin film transistor (TFT) 213, makes the liquid crystal capacitance of this row be in charged state.When this sweep signal disappeared, each liquid crystal capacitance charging finished, and this liquid crystal capacitance keeps this image data voltage.
After this sweep signal is applied to the last item sweep trace 211, enter the second subframe t2.In this second subframe t2, this scan drive circuit 22 produces a plurality of sweep signals continuously, and should a plurality of sweep signals be applied to each sweep trace 211 successively.In this sweep signal scan period, delegation's thin film transistor (TFT) 213 conductings that are connected with the sweep trace 211 that is scanned.This data drive circuit 23 is applied to this Plug Grey data voltage by this data line 212 source electrode of corresponding thin film transistor (TFT) 213 simultaneously, and be sent in this pixel electrode 215 by this thin film transistor (TFT) 213, make the liquid crystal capacitance of this row be in charged state, and the charging finish after this liquid crystal capacitance keep this Plug Grey data voltage.After this sweep signal was applied to the last item sweep trace 211, this liquid crystal indicator 20 was finished the demonstration of a frame picture.
Wherein, in same frame, the GTG sum of the GTG of this image data voltage and this Plug Grey data voltage equals the twice of a target gray scale, and this target gray scale is the GTG that these liquid crystal indicator 20 actual needs show.And the GTG of this image data voltage is greater than this target gray scale, and the GTG of this Plug Grey data voltage is less than this target gray scale.For example: when the target gray scale of N frame picture demonstration was 150 GTGs, the GTG of this image data voltage was 200 GTGs, and the GTG of this Plug Grey data voltage is 100 GTGs.
The polarity of this image data voltage is all reversed at each frame, and promptly the image data voltage of next frame is opposite with the polarity of the image data voltage of former frame.This Plug Grey data voltage is opposite with the image data voltage polarity of present frame, and is identical with the image data voltage polarity of next frame.
Compared with prior art, this liquid crystal indicator 20 is divided into the first subframe t1 and the second subframe t2 with a frame, and export this image data voltage at the first subframe t1, t2 exports this Plug Grey data voltage in this second subframe, drive this liquid crystal panel 21, and the polarity of the Plug Grey data voltage of present frame is identical with the image data voltage polarity of next frame.Then, be changed to the next frame image data voltage from this Plug Grey data voltage, its change in voltage amplitude is less.Therefore, can make the image data voltage charging of next frame faster, reduce of the influence of former frame picture, eliminate the fuzzy pictures phenomenon back one frame picture.
See also Fig. 5, it is the local circuit block diagram of liquid crystal indicator second embodiment of the present invention.The structure of the liquid crystal indicator of the liquid crystal indicator of this second embodiment and this first embodiment is basic identical, its key distinction is: the selector switch 362 in the Plug Grey data generating circuit 36 further comprises a register 363, and this register 363 is used to store the image data voltage of adjacent two frames.This selector switch 362 selects a Plug Grey data voltage to output to this data drive circuit 33, and wherein, the image data voltage polarity of back one frame is identical in adjacent two frames with this of the polarity of this Plug Grey data voltage.
See also Fig. 6, it is the driving voltage waveform figure of the liquid crystal indicator of second embodiment shown in Figure 5.Wherein, once by the per two frames counter-rotating of the polarity of these data drive circuit 33 these image data voltages of control.That is, at the first subframe t1 of N frame, the reversal of poles of the image data voltage of a certain pixel is negative polarity; Then at the first subframe t1 of N+1 frame, the polarity of the image data voltage of this pixel keeps negative polarity; At the first subframe t1 of N+2 frame, the reversal of poles of the image data voltage of this pixel is positive polarity.And at the second subframe t2 of each frame, this pixel all receives the Plug Grey data voltage.Wherein, the polarity of this Plug Grey data voltage is identical with next frame image data voltage polarity.In like manner, the every n frame counter-rotating of this data drive circuit 33 polarity that can control this image data voltage once.N is an integer, and n is more than or equal to 1.Simultaneously, in order to ensure the effect of inversion driving, the value of n be 4 with interior better.
Compare with the liquid crystal indicator of this first embodiment, in the liquid crystal indicator of this second embodiment, the every n frame of the polarity of this image data voltage reverses once, wherein, and 1≤n≤4.Promptly reduce the frequency of image data voltage counter-rotating, can reduce the scintillation that the image data voltage counter-rotating causes.
Claims (10)
1. liquid crystal indicator, it comprises a liquid crystal panel and a data drive circuit, this data drive circuit drives this liquid crystal panel and shows, it is characterized in that: this liquid crystal indicator further comprises a Plug Grey data generating circuit, it exports a Plug Grey data voltage to this data drive circuit, each frame of this liquid crystal indicator all comprises one first subframe and one second subframe, this data drive circuit is exported an image data voltage in this first subframe, export this Plug Grey data voltage to this liquid crystal panel in this second subframe, the Plug Grey data voltage of present frame is identical with the polarity of the image data voltage of next frame.
2. liquid crystal indicator as claimed in claim 1 is characterized in that: this Plug Grey data generating circuit comprises a voltage generator, and this voltage generator produces this Plug Grey data voltage.
3. liquid crystal indicator as claimed in claim 2, it is characterized in that: this Plug Grey data generating circuit further comprises a selector switch, it is used to select the Plug Grey data voltage identical with this next frame image data voltage polarity, and this Plug Grey data voltage is outputed to this data drive circuit.
4. liquid crystal indicator as claimed in claim 3 is characterized in that: selector switch further comprises a register, and this register is used to store the image data voltage of this present frame and the image data voltage of this next frame.
5. liquid crystal indicator as claimed in claim 4 is characterized in that: the every n frame of polarity that this data drive circuit is controlled this image data voltage reverses once, wherein, and 1≤n≤4.
6. liquid crystal indicator as claimed in claim 1 is characterized in that: the time of the time of this first subframe with this second subframe equates.
7. liquid crystal indicator as claimed in claim 1 is characterized in that: this liquid crystal indicator further comprises scan driving circuit, and it connects this liquid crystal panel, and at equal this liquid crystal panel of output scanning signal scanning of each subframe.
8. liquid crystal indicator, it comprises a liquid crystal panel and a data drive circuit, this data drive circuit exports one first frame image data voltage and one second frame image data voltage arrives this liquid crystal panel, it is characterized in that: this liquid crystal indicator further comprises a Plug Grey data generating circuit, this Plug Grey data generating circuit is exported a Plug Grey data voltage to this liquid crystal panel between this first frame image data voltage and this second frame image data voltage, the polarity of this Plug Grey data voltage is identical with the polarity of this second frame image data voltage.
9. liquid crystal display apparatus driving circuit, it may further comprise the steps:
A) scan a liquid crystal panel in first subframe, and export an image data voltage to this liquid crystal panel;
B) scan this liquid crystal panel in second subframe, and export a Plug Grey data voltage to this liquid crystal panel, wherein, this Plug Grey data voltage is identical with the image data voltage polarity of next subframe.
10. liquid crystal display apparatus driving circuit as claimed in claim 9 is characterized in that: the every n frame of the polarity of this image data voltage reverses once, wherein, and 1≤n≤4.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2008101417613A CN101661714B (en) | 2008-08-29 | 2008-08-29 | Liquid crystal display device and driving method thereof |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2008101417613A CN101661714B (en) | 2008-08-29 | 2008-08-29 | Liquid crystal display device and driving method thereof |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN101661714A true CN101661714A (en) | 2010-03-03 |
| CN101661714B CN101661714B (en) | 2012-02-08 |
Family
ID=41789695
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2008101417613A Expired - Fee Related CN101661714B (en) | 2008-08-29 | 2008-08-29 | Liquid crystal display device and driving method thereof |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN101661714B (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102196290A (en) * | 2011-03-23 | 2011-09-21 | 深圳创维－Rgb电子有限公司 | Three-dimensional (3D) image display control method and system |
| CN102402935A (en) * | 2011-11-17 | 2012-04-04 | 华映视讯（吴江）有限公司 | Display and method capable of improving picture quality |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| TWI450244B (en) | 2011-11-07 | 2014-08-21 | Chunghwa Picture Tubes Ltd | Display capable of improving frame quality and method thereof |
Family Cites Families (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP4124092B2 (en) * | 2003-10-16 | 2008-07-23 | 沖電気工業株式会社 | Driving circuit for liquid crystal display device |
| WO2007015347A1 (en) * | 2005-08-01 | 2007-02-08 | Sharp Kabushiki Kaisha | Display device, its drive circuit, and drive method |
| JP5132566B2 (en) * | 2006-09-28 | 2013-01-30 | シャープ株式会社 | Liquid crystal display device and television receiver |
-
2008
- 2008-08-29 CN CN2008101417613A patent/CN101661714B/en not_active Expired - Fee Related
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102196290A (en) * | 2011-03-23 | 2011-09-21 | 深圳创维－Rgb电子有限公司 | Three-dimensional (3D) image display control method and system |
| CN102402935A (en) * | 2011-11-17 | 2012-04-04 | 华映视讯（吴江）有限公司 | Display and method capable of improving picture quality |
Also Published As
| Publication number | Publication date |
|---|---|
| CN101661714B (en) | 2012-02-08 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN101312026B (en) | Liquid crystal display device and its drive method | |
| US7102610B2 (en) | Display system with frame buffer and power saving sequence | |
| US8581823B2 (en) | Liquid crystal display device and driving method thereof | |
| JP5649858B2 (en) | Liquid crystal display device, liquid crystal display panel drive device, and liquid crystal display panel | |
| JP4271414B2 (en) | Image display device and display driving method | |
| US7570241B2 (en) | Liquid crystal display device and method of driving the same | |
| KR100549983B1 (en) | Liquid crystal display device and driving method of the same | |
| CN1983379B (en) | Display device | |
| JP2004294733A (en) | Image display device, and signal line driving circuit and method used for image display device | |
| CN100388330C (en) | Display device | |
| CN105448256A (en) | Liquid crystal display device and driving method thereof | |
| US10134350B2 (en) | Shift register unit, method for driving same, gate driving circuit and display apparatus | |
| US7893910B2 (en) | Method for driving liquid crystal display via circularly reversing polarities of pixels thereof | |
| CN101661714B (en) | Liquid crystal display device and driving method thereof | |
| CN1987977A (en) | Driving method for liquid crystal display panel | |
| KR100880942B1 (en) | Method and apparatus for driving liquid crystal display | |
| CN100570457C (en) | Gate drivers, electrooptical device, electronic equipment and driving method | |
| JP2008216893A (en) | Flat panel display device and display method thereof | |
| CN116168656A (en) | Array substrate and display panel | |
| JP2006072211A (en) | Liquid crystal display and driving method of liquid crystal display | |
| KR20080050313A (en) | Liquid crystal display device and driving method thereby | |
| TWI417848B (en) | Liquid crystal display device and driving method thereof | |
| KR100994229B1 (en) | Liquid crystal display apparatus and method for driving the same | |
| KR100604272B1 (en) | Liquid crystal display apparatus and method for driving the same | |
| KR100317321B1 (en) | Liquid crystal display device |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| ASS | Succession or assignment of patent right |
Owner name: QIMEI ELECTRONIC CO LTD Free format text: FORMER OWNER: INNOLUX DISPLAY CO., LTD. Effective date: 20111214 |
|
| C41 | Transfer of patent application or patent right or utility model | ||
| TA01 | Transfer of patent application right |
Effective date of registration: 20111214 Address after: 518109 Longhua, Shenzhen, town, Foxconn science and Technology Industrial Park E District, building 1, floor 4, Applicant after: Qunkang Technology (Shenzhen) Co., Ltd. Co-applicant after: Chimei Optoelectronics Co., Ltd. Address before: 518109 Longhua, Shenzhen, town, Foxconn science and Technology Industrial Park E District, building 1, floor 4, Applicant before: Qunkang Technology (Shenzhen) Co., Ltd. Co-applicant before: Innolux Display Group |
|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20120208 Termination date: 20180829 |