CN101192383A - LCD device and its drive circuit and driving method - Google Patents
LCD device and its drive circuit and driving method Download PDFInfo
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- CN101192383A CN101192383A CNA200610157134XA CN200610157134A CN101192383A CN 101192383 A CN101192383 A CN 101192383A CN A200610157134X A CNA200610157134X A CN A200610157134XA CN 200610157134 A CN200610157134 A CN 200610157134A CN 101192383 A CN101192383 A CN 101192383A
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- drive circuit
- liquid crystal
- film transistor
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Abstract
The invention provides a liquid crystal display device, a driving circuit and a driving method thereof. The liquid crystal display device comprises a liquid crystal panel, a scanning driving circuit, a data driving circuit and a compensation circuit and the liquid crystal panel comprises a plurality of parallel scanning lines, a plurality of data lines intersected with and insulated from the scanning lines and a plurality of thin film transistors arranged at the positions where the scanning lines are intersected with the data lines. The scanning driving circuit is used for supplying a plurality of scanning signals to a plurality of scanning lines and the data driving circuit is used for providing the grayscale voltage for a plurality of data lines when the scanning line is scanned; the compensation circuit is electrically connected with one end of a plurality of scanning lines which are far from the scanning driving circuit and the compensation circuit applies an external DC voltage to the scanning line when each scanning line is scanned.
Description
Technical field
The invention relates to a kind of liquid crystal indicator and driving circuit thereof and driving method.
Background technology
Along with the liquid crystal indicator size increases and the resolution increase, adopt thin film transistor (TFT) (Thin Film Transistor, the obvious phenomenon that postpones of high potential signal of sweep trace appears in liquid crystal indicator TFT) owing to wiring is long, promptly the scanning signal delay phenomenon also becomes serious.
Seeing also Fig. 1, is a kind of electrical block diagram of prior art liquid crystal indicator.This liquid crystal indicator 100 comprises a liquid crystal panel 130, scan driving circuit 110 and a data drive circuit 120.This scan drive circuit 110 is used to scan this liquid crystal panel 130, and this data drive circuit 120 is used for providing gray scale voltage to it when this liquid crystal panel 130 is scanned.
Seeing also Fig. 2, is the equivalent circuit diagram of pixel cell 150 shown in Figure 1.This pixel cell 150 comprises a thin film transistor (TFT) 151, a storage capacitors 152, a pixel electrode 154 and a public electrode 153.The grid of this thin film transistor (TFT) 151 is connected with this sweep trace 111, and source electrode is connected with this data line 121, and drain electrode and an end of this storage capacitors 152 i.e. this pixel electrode 154 are connected.The other end of this storage capacitors 152 is connected to this public electrode 153.This thin film transistor (TFT) 151 is as the gauge tap of these storage capacitors 152 chargings, discharge.
Because this sweep trace 111 itself has certain resistance R, and can produce a stray capacitance C between the grid of this thin film transistor (TFT) 151 and the drain electrode
Gd, make this resistance R and this stray capacitance C
GdConstitute a RC delay circuit.This RC delay circuit makes the sweep signal be applied on this sweep trace 111 produce distortion, and degreeof tortuosity is by the resistance R and the stray capacitance C of this sweep trace 111 itself
GdDecision.
Seeing also Fig. 3, is the sweep signal oscillogram of one scan line 111.Wherein, " V
On" represent the cut-in voltage of the thin film transistor (TFT) 151 of each pixel cell 150, " V
Off" represent each pixel cell 150 thin film transistor (TFT) 151 close voltage; " Vg1 " represents the signal waveform figure at these sweep trace 111 contiguous these scan drive circuit 110 places, and " Vg2 " represents the signal waveform figure of this sweep trace 111 away from these scan drive circuit 110 places.As can be seen from the figure, Vg2 produces distortion, makes the opening time of its corresponding thin film transistor (TFT) 151 postpone t second.
Because this data driving circuit 120 provides the time of gray scale voltage consistent with the desirable opening time of this thin film transistor (TFT) 151, produce when postponing away from the ON time of the thin film transistor (TFT) 151 of this scan drive circuit 110, this data driving circuit 120 can correspondingly not postpone to provide gray scale voltage, cause gray scale voltage to shorten via the time that this thin film transistor (TFT) 151 writes this storage capacitors 152, be equivalent to reduce the renewal frequency (RefreshRate) of liquid crystal panel 130, thereby caused film flicker.
Summary of the invention
In order to solve the problem of liquid crystal indicator film flicker in the prior art, be necessary to provide a kind of liquid crystal indicator that improves film flicker.
Also be necessary to provide a kind of driving circuit that improves film flicker.
Also be necessary to provide a kind of driving method that improves film flicker.
A kind of liquid crystal indicator, it comprises a liquid crystal panel, scan driving circuit, a data drive circuit and a compensating circuit.This liquid crystal panel comprises many parallel scanning beams, many data line and a plurality of thin film transistor (TFT)s that are positioned at this sweep trace and this data line infall that intersect with this sweep trace insulation.This scan drive circuit is used to provide a plurality of sweep signals to this multi-strip scanning line; This data drive circuit is used for providing gray scale voltage for these many data lines when this sweep trace is scanned; This compensating circuit is electrically connected on the end of this multi-strip scanning line away from this scan drive circuit, and when each horizontal scanning line was scanned, this compensating circuit applied an external DC voltage to this sweep trace.
A kind of driving circuit, it comprises many parallel scanning beams, many data line, a plurality of thin film transistor (TFT), scan driving circuit, a data drive circuit and the compensating circuits that are positioned at this sweep trace and this data line infall that intersect with this sweep trace insulation.This scan drive circuit is used to provide a plurality of sweep signals to this multi-strip scanning line; This data drive circuit is used for providing gray scale voltage for these many data lines when this sweep trace is scanned; This compensating circuit is electrically connected on the end of this multi-strip scanning line away from this scan drive circuit, and when each horizontal scanning line was scanned, this compensating circuit applied an external DC voltage to this sweep trace.
A kind of driving method of liquid crystal indicator, it may further comprise the steps: scan driving circuit is provided, and its multi-strip scanning line to this liquid crystal indicator is lined by line scan; One compensating circuit is provided, and it puts on the end of this sweep trace away from this scan drive circuit with an external DC voltage, and the scanning voltage signal that this scan drive circuit is applied to this multi-strip scanning line compensates one by one.
Compared with prior art, because this liquid crystal indicator and driving circuit thereof comprise a compensating circuit, this compensating circuit can an external direct current voltage and this voltage is put on the end of this multi-strip scanning line, the scanning voltage that causes owing to delayed sweep postponing is compensated, thereby supply the ON time of the thin film transistor (TFT) that the sweep trace end connected, assurance data driving circuit has the sufficient time that gray scale voltage is write storage capacitors, has improved the film flicker that delayed sweep causes.When above-mentioned liquid crystal display apparatus driving circuit is used to drive this liquid crystal indicator, when each horizontal scanning line is scanned, this compensating circuit puts on the end of this horizontal scanning line away from this scan drive circuit with an external DC voltage, this liquid crystal display apparatus driving circuit this line scanning signal compensated, so can improve film flicker.
Description of drawings
Fig. 1 is a kind of electrical block diagram of prior art liquid crystal indicator.
Fig. 2 is the equivalent circuit diagram of pixel cell shown in Figure 1.
Fig. 3 is the sweep signal oscillogram of liquid crystal indicator one scan line shown in Figure 1.
Fig. 4 is the electrical block diagram of liquid crystal indicator one better embodiment of the present invention.
Embodiment
Seeing also Fig. 4, is the electrical block diagram of liquid crystal indicator one better embodiment of the present invention.This liquid crystal indicator 200 comprises a liquid crystal panel 230, scan driving circuit 210, a data drive circuit 220 and a compensating circuit 290.This scan drive circuit 210 and this data drive circuit 220 are that (Chip on Glass, COG) manufacture method is fitted on this liquid crystal panel 230 by glass flip chip.This scan drive circuit 210 is used to scan this liquid crystal panel 230, and this data drive circuit 220 is used for providing gray scale voltage to it when this liquid crystal panel 230 is scanned, and this compensating circuit 290 is used to afford redress sweep signal to this liquid crystal panel 230.
This liquid crystal panel 230 comprises many parallel scanning beams 231, many parallel and data line 233 and a plurality of pixel cell 250 that intersect with these sweep trace 231 insulation.One end of this multi-strip scanning line 231 is connected with this scan drive circuit 210, and the other end is connected with this compensating circuit 290.These many data lines 233 are connected with this data drive circuit 220.Each pixel cell 250 is positioned at the minimum rectangular area that this multi-strip scanning line 231 and these many data lines 233 are defined.
Each pixel cell 250 comprises a thin film transistor (TFT) 251, a storage capacitors 252, a pixel electrode 254 and a public electrode 253.The grid of this thin film transistor (TFT) 251 is connected with this sweep trace 231, and source electrode is connected with this data line 233, and drain electrode and an end of this storage capacitors 252 i.e. this pixel electrode 254 are connected.The other end of this storage capacitors 252 is connected to this public electrode 253.This thin film transistor (TFT) 251 is as the gauge tap of these storage capacitors 252 charge and discharge.
This compensating circuit 290 comprises a plurality of compensating units 280, and it is connected with this multi-strip scanning line 231 respectively.Each compensating unit 280 comprises one first switching thin-film transistor 281, a second switch thin film transistor (TFT) 282 and an input end 283.This input end 283 is source electrodes of this first switching thin-film transistor 281, and it is connected with a 15v d. c. voltage signal line (not indicating) of this data drive circuit 220.The drain electrode short circuit of the grid of this first switching thin-film transistor 281 and this second switch thin film transistor (TFT) 282 also is connected to this sweep trace 231, and the source electrode of the drain electrode of this first switching thin-film transistor 281 and this second switch thin film transistor (TFT) 282, grid be short circuit all.
During these liquid crystal indicator 200 operate as normal, this scan drive circuit 210 is exported a 15v direct current scanning voltage, and this multi-strip scanning line 231 is lined by line scan.In the scanning process, the thin film transistor (TFT) 251 that each horizontal scanning line 231 is partly connected near these scan drive circuits 210 is normally all, and this data drive circuit 220 writes its pairing storage capacitors 252 via corresponding data line 233 and the thin film transistor (TFT) 251 that is in conducting state with gray scale voltage successively.Because this sweep trace 231 itself has resistance R, and there is stray capacitance C between the grid of this thin film transistor (TFT) 151 and the drain electrode
Gd(indicate), the RC loop of the two formation has late effect, thereby this scanning voltage is transferred to each horizontal scanning line 231 and all postpones when terminal.
First switching thin-film transistor 281 that the scanning voltage that each horizontal scanning line 231 end has postponed triggers the compensating unit 280 that is connected with this horizontal scanning line 231 makes its conducting.The 15v DC voltage of being drawn by this data drive circuit 220 enters this compensating unit 280 via this input end 283, again via the source electrode of this first switching thin-film transistor 281, drain electrode grid to this second switch thin film transistor (TFT) 282, thus this second switch thin film transistor (TFT) 282 of conducting.This 15v DC voltage is via the source electrode of this second switch thin film transistor (TFT) 282, the end that drain electrode puts on this sweep trace 231, supply ON time, make this data driving circuit 220 have adequate time that gray scale voltage is write this thin film transistor (TFT) 251 pairing storage capacitors 252 away from the thin film transistor (TFT) 251 of this scan drive circuit 210.
210 pairs of these multi-strip scanning lines 231 of this scan drive circuit are lined by line scan, accordingly, the scanning voltage that transfers to these multi-strip scanning line 231 ends also triggers these a plurality of compensating units 280 one by one, and these a plurality of compensating units 280 respond one by one and the 15v DC voltage is applied to its sweep trace that connects 231 ends.In the cycle that shows a frame picture, this scan drive circuit 210 to each horizontal scanning line 231 been scanned after, all no longer apply the scanning voltage signal to it, also corresponding the ending of compensating unit 280 that is connected with this horizontal scanning line 231, the DC voltage of being drawn by this data drive circuit 220 also no longer is applied to the end of this horizontal scanning line 231 via this compensating unit 280.
Compared with prior art, because this liquid crystal panel 230 comprises this compensating circuit 290, during these liquid crystal indicator 200 work, this compensating circuit 290 can connect a direct current high voltage and this voltage be put on the end of this multi-strip scanning line 231, thereby supply the ON time of the thin film transistor (TFT) 251 that sweep trace 231 ends are connected, guarantee that this data driving circuit 220 has the sufficient time that gray scale voltage is write storage capacitors 252, has improved the film flicker that delayed sweep causes.
The input end 283 of these a plurality of compensating units 280 is not limited to be connected with the 15v d. c. voltage signal line of this data driving circuit 220, and it also can be connected with other 15v d. c. voltage signal of this liquid crystal indicator 200 or be connected with the 15v d. c. voltage signal of these liquid crystal indicator 200 outsides.
The scanning voltage and the external dc voltage value of compensating circuit of scan drive circuit of the present invention output are not limited to 15v, according to its also other magnitude of voltage of the difference of liquid crystal indicator, only need the external magnitude of voltage of compensating circuit identical with the scanning voltage value.
Claims (10)
1. liquid crystal indicator, it comprises a liquid crystal panel, scan driving circuit, one data drive circuit, this liquid crystal panel comprises many parallel scanning beams, many data line and a plurality of thin film transistor (TFT)s that are positioned at this sweep trace and this data line infall that intersect with this sweep trace insulation, this scan drive circuit is used to provide a plurality of sweep signals to this multi-strip scanning line, this data drive circuit is used for providing gray scale voltage for these many data lines when this sweep trace is scanned, it is characterized in that: this liquid crystal indicator further comprises a compensating circuit, it is electrically connected on the end of this multi-strip scanning line away from this scan drive circuit, when each horizontal scanning line was scanned, this compensating circuit applied an external DC voltage to this sweep trace.
2. liquid crystal indicator as claimed in claim 1 is characterized in that: the scanning voltage value of this scan drive circuit output is consistent with the external voltage value that this compensating circuit is applied to this sweep trace.
3. liquid crystal indicator as claimed in claim 1, it is characterized in that: this compensating circuit comprises a plurality of compensating units, it is connected with this multi-strip scanning line respectively and the scanning voltage signal of this scan drive circuit output is compensated, each compensating unit comprises one first switching thin-film transistor, an one second switch thin film transistor (TFT) and an input port, this input port is the source electrode of this first switching thin-film transistor, the drain electrode short circuit of the grid of this first switching thin-film transistor and this second switch thin film transistor (TFT) also is connected to this sweep trace, the source electrode of its drain electrode and this second switch thin film transistor (TFT), grid is short circuit all.
4. liquid crystal indicator as claimed in claim 1 is characterized in that: the input port of these a plurality of compensating units all is connected with a direct current voltage signal line of this data drive circuit.
5. LCD drive circuits, it comprises many parallel scanning beams, many the data lines that intersect with this sweep trace insulation, a plurality of thin film transistor (TFT)s that are positioned at this sweep trace and this data line infall, scan driving circuit, one data drive circuit, this scan drive circuit is used to provide a plurality of sweep signals to this multi-strip scanning line, this data drive circuit is used for providing gray scale voltage for these many data lines when this sweep trace is scanned, it is characterized in that: this driving circuit further comprises a compensating circuit, it is electrically connected on the end of this multi-strip scanning line away from this scan drive circuit, when each horizontal scanning line was scanned, this compensating circuit applied an external DC voltage to this sweep trace.
6. liquid crystal indicator driving circuit as claimed in claim 5, it is characterized in that: this compensating circuit comprises a plurality of compensating units, it is connected with this multi-strip scanning line respectively and the scanning voltage signal of this scan drive circuit output is compensated, each compensating unit comprises one first switching thin-film transistor, an one second switch thin film transistor (TFT) and an input port, this input port is the source electrode of this first switching thin-film transistor, the drain electrode short circuit of the grid of this first switching thin-film transistor and this second switch thin film transistor (TFT) also is connected to this sweep trace, the source electrode of its drain electrode and this second switch thin film transistor (TFT), grid is short circuit all.
7. liquid crystal indicator driving circuit as claimed in claim 5 is characterized in that: the scanning voltage value of this scan drive circuit output is consistent with the external voltage value that this compensating circuit is applied to this sweep trace.
8. the driving method of a liquid crystal indicator, it may further comprise the steps:
Scan driving circuit is provided, and its multi-strip scanning line to this liquid crystal indicator is lined by line scan;
One compensating circuit is provided, and it puts on the end of this sweep trace away from this scan drive circuit with an external DC voltage, and the scanning voltage signal that this scan drive circuit is applied to this multi-strip scanning line compensates one by one.
9. liquid crystal display apparatus driving circuit as claimed in claim 8, it is characterized in that: this compensating circuit comprises a plurality of compensating units, when this scan drive circuit is lined by line scan to this multi-strip scanning line, corresponding conducting one by one of these a plurality of compensating units and the scanning voltage signal that this scan drive circuit is exported compensate, the external dc voltage value of this compensating unit is to be drawn by a data drive circuit of this liquid crystal indicator, and its scanning voltage value with this scan drive circuit output is consistent.
10. liquid crystal display apparatus driving circuit as claimed in claim 8 is characterized in that: showing in the cycle of a frame picture, this scan drive circuit to each horizontal scanning line been scanned after, this compensating circuit is by the compensation to this horizontal scanning line.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNA200610157134XA CN101192383A (en) | 2006-11-29 | 2006-11-29 | LCD device and its drive circuit and driving method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNA200610157134XA CN101192383A (en) | 2006-11-29 | 2006-11-29 | LCD device and its drive circuit and driving method |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN101192383A true CN101192383A (en) | 2008-06-04 |
Family
ID=39487337
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNA200610157134XA Pending CN101192383A (en) | 2006-11-29 | 2006-11-29 | LCD device and its drive circuit and driving method |
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| Country | Link |
|---|---|
| CN (1) | CN101192383A (en) |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102402084A (en) * | 2011-09-09 | 2012-04-04 | 友达光电股份有限公司 | Display panel and alignment method thereof |
| CN101963724B (en) * | 2009-07-22 | 2012-07-18 | 北京京东方光电科技有限公司 | Liquid crystal display driving device |
| CN104361855A (en) * | 2014-12-10 | 2015-02-18 | 上海天马微电子有限公司 | Display panel and electronic equipment |
| CN105047154A (en) * | 2015-08-11 | 2015-11-11 | 武汉华星光电技术有限公司 | Driving compensating circuit, liquid crystal display device with driving compensating circuit and driving method |
| CN110310598A (en) * | 2019-06-28 | 2019-10-08 | 上海天马有机发光显示技术有限公司 | A kind of display panel and its application method |
-
2006
- 2006-11-29 CN CNA200610157134XA patent/CN101192383A/en active Pending
Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101963724B (en) * | 2009-07-22 | 2012-07-18 | 北京京东方光电科技有限公司 | Liquid crystal display driving device |
| US8531366B2 (en) | 2009-07-22 | 2013-09-10 | Beijing Boe Optoelectronics Technology Co., Ltd. | LCD driving device and method for driving the same |
| US8957839B2 (en) | 2009-07-22 | 2015-02-17 | Beijing Boe Optoelectronics Technology Co., Ltd. | Liquid crystal display driving device and driving method of liquid crystal display driving device |
| CN102402084A (en) * | 2011-09-09 | 2012-04-04 | 友达光电股份有限公司 | Display panel and alignment method thereof |
| TWI465821B (en) * | 2011-09-09 | 2014-12-21 | Au Optronics Corp | Display panel and alignment method thereof |
| CN104361855A (en) * | 2014-12-10 | 2015-02-18 | 上海天马微电子有限公司 | Display panel and electronic equipment |
| US9898950B2 (en) | 2014-12-10 | 2018-02-20 | Shanghai Tianma Micro-electronics Co., Ltd. | Display panel device |
| CN105047154A (en) * | 2015-08-11 | 2015-11-11 | 武汉华星光电技术有限公司 | Driving compensating circuit, liquid crystal display device with driving compensating circuit and driving method |
| CN110310598A (en) * | 2019-06-28 | 2019-10-08 | 上海天马有机发光显示技术有限公司 | A kind of display panel and its application method |
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Open date: 20080604 |