CN1755467A - Pre-charging scanning method for thin film transistor LCD panel - Google Patents
Pre-charging scanning method for thin film transistor LCD panel Download PDFInfo
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- CN1755467A CN1755467A CN 200410080656 CN200410080656A CN1755467A CN 1755467 A CN1755467 A CN 1755467A CN 200410080656 CN200410080656 CN 200410080656 CN 200410080656 A CN200410080656 A CN 200410080656A CN 1755467 A CN1755467 A CN 1755467A
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Abstract
The invention relates to a film crystal pipe liquid crystal display plane which uses two scanning line to acquire the expected effect and uses the scanning method of the two scanning line to reduce the charging time of the crystal liquid by the thin film transistor.
Description
Technical field
The present invention relates to the scan method of a kind of thin film transistor (TFT) (Thin Film Transistor is called for short TFT) when liquid crystal is charged, particularly all can realize easily for the reversal of poles scan mode of commonly using.
Background technology
Recently common Thin Film Transistor-LCD (TFTLCD) be widely used in each side, the little in light weight and power saving of volume is its biggest advantage.As shown in Figure 1, LCD device has mainly comprised the signal drive circuit 30 of the array that a plural groups pixel is arranged, the TFT switch 40 that is arranged in each pixel, scan drive circuit or gate drive circuit l0, data drive circuit or source electrode drive circuit 20, gated sweep driving circuit 10 and source electrode drive circuit 20 etc.Scan drive circuit l0 is connected with the control utmost point of first row by article one sweep trace G (1), and second sweep trace G (2) is connected with the control utmost point of secondary series, and the rest may be inferred to the last one is listed as; Scan drive circuit 10 is after receiving control signal, each sweep trace can send sweep signal on same the sweep trace control utmost point of TFT in each pixel, source electrode drive circuit is then equally by the first row D (1) on the other hand, the second row D (2) ... to last column D (M), every row all is vertically connected at each pixel TFT source electrode electrically, the data-signal that source electrode drive circuit 20 provides charges to required voltage by data line to a pixel that lists and shows different color ranges, when this row duration of charging finishes the back and controls utmost point driving circuit 10 and just voltage is closed, move continuously each bar sweep trace in the scanning element matrix according to this.Liquid crystal LCD device is usually with the polar switching between 60Hz alternating voltage driving show electrode and ordinary electrode, this method can be changed the polarity of each pixel voltage of scanning between per two adjacent picture frame times (frame time), so can avoid the branch cracking of liquid crystal molecule, to prevent the reduction of image quality.As shown in Figure 2, the method of polar switching is commonly used picture frame reversal of poles method (frame inversion), this method alternately changes its polarity of show electrode with respect to ordinary electrode in two adjacent frames, but because the error of ordinary electrode voltage and the factors such as impurity in liquid crystal hole (liquid crystal cells), cause inter-electrode voltage can't the symmetry, so the positive voltage effective value is gone up in general use and the negative voltage effective value is different each other, so will cause the fluctuation in the lightness (luminance), this method is in the phenomenon that can see flicker under the sweep frequency of 60Hz in the frequency of 30Hz; As shown in Figure 3, develop outlet reversal of poles method (line inversion) in order to improve this phenomenon, this method is two adjacent frames between the time, pixel with row or several column is that unit carries out reversal of poles, and present opposite polarity between a column scan line and other several column sweep trace, utilize this method, even employed data generating positive and negative voltage effective value at last picture frame with at present different between the picture frame, its effective value difference also can be cancelled thereby can suppress to spatiality the flicker of 30Hz, so mode can reduce the fluctuation of lightness, promotes image quality.
As shown in Figure 4, the traditional wire scan mode once only scans a column scan line, that is to say once and can only the TFT on same the sweep trace be charged, in special time respectively by G (1), G (2) ..., G (n-1), G (n), wherein G (1) is article one sweep trace, G (n) is the last item sweep trace; Be scanned up to G (n) in the progressive mode that circulates by G (1), be scanned up to G (n), the circulation that so goes round and begins again by G (1) in regular turn again in the next picture frame time.
Because TFT design when not good or when speeding sweep frequency, because of duration of charging of each bar line is lowered, thing followed problem is a undercharge to its main shortcoming of tradition scanning for usually, and cause picture quality not good with contrast problem such as reduction.
Summary of the invention
Fundamental purpose of the present invention is the kenel according to reversal of poles, its multiple different preliminary filling mode is proposed, the problem of the undercharge that the one-line scanning mode of commonly using with improvement is brought, and reduce the duration of charging of TFT to liquid crystal, can operate in high picture frame turnover rate (Frame Rate) and then can make aperture opening ratio (aperture ratio) promote by the less TFT of design.
For the reversal of poles kenel that realizes purpose of the present invention, the present invention is directed to commonly using provides following preliminary filling scanning method:
The preliminary filling scan mode of single line reversal of poles (1Line Inversion): shown in Fig. 5 A, when sweep signal when each column scan line is charged, the thin film transistor (TFT) of opening simultaneously on the adjacent up or down secondary series sweep trace of these row carries out precharge.
The preliminary filling scan mode of two-wire reversal of poles (2Line Inversion): as shown in Figure 6A, when sweep signal when each column scan line is charged, the thin film transistor (TFT) of opening simultaneously on adjacent up or down the 4th column scan line of these row carries out precharge.
The preliminary filling scan mode of single two-wire reversal of poles (1+2Line Inversion): shown in Fig. 7 A, when sweep signal when each column scan line is charged, the thin film transistor (TFT) of opening simultaneously on adjacent up or down the 4th column scan line of these row carries out precharge.
Description of drawings
Fig. 1 is for commonly using the circuit structure diagram of LCD panel of thin-film transistor.
Fig. 2 is for commonly using the picture frame reversal of poles method (frame inversion) of panel of LCD.
Fig. 3 is a line reversal of poles method (line inversion) of commonly using panel of LCD.
Fig. 4 is for commonly using Thin Film Transistor-LCD scan mode synoptic diagram.
Fig. 5 A is the preliminary filling scan mode synoptic diagram that is used in single line reversal of poles (1Line Inversion) for the present invention.
Fig. 5 B lists intention for preliminary filling scanning impulse that the present invention is used in single line reversal of poles (1Line Inversion).
Fig. 6 A, the present invention are used in the preliminary filling scan mode synoptic diagram of two-wire reversal of poles (2Line Inversion).
The preliminary filling scanning impulse that Fig. 6 B, the present invention are used in two-wire reversal of poles (2Line Inversion) lists intention.
Fig. 7 A, the present invention are used in the preliminary filling scan mode synoptic diagram of single two-wire reversal of poles (1+2Line Inversion).
The preliminary filling scanning impulse that Fig. 7 B, the present invention are used in single two-wire reversal of poles (1+2Line Inversion) lists intention.
Among the figure
10: scan drive circuit or gate drive circuit
20: data drive circuit or source electrode drive circuit
30: signal drive circuit
40: thin film transistor (TFT)
G (1)～G (N): the first column scan line～last column scan line
D (1)～D (N): the first line data line～last column data line
50: the scan period of potential pulse row
60: the horizon scan line cycle
Embodiment
With reference to Fig. 5 A, shown in Fig. 5 B, it is the example that the present invention is used in the preliminary filling method of single line reversal of poles (1Line Inversion), the order that once drives a column scan line that is connected in the control utmost point driving circuit of all sweep traces changed into once drive two row, this driving is in proper order: when previous time-frame frame (N-1), the polarity that each sweep trace presented is then different the putting in order of polarity of adjacent column sweep trace, promptly when first column scan line G (1) show electrode (Pixel Electrode) voltage is negative voltage with respect to the voltage of ordinary electrode (CommonElectrode), then secondary series sweep trace G (2) show electrode voltage is positive voltage with respect to the voltage of ordinary electrode, the 3rd column scan line G (3) show electrode voltage is again negative voltage with respect to the voltage of ordinary electrode ... with the different series arrangement of the sweep trace polarity of this adjacent column, and when being across to present time-frame frame N and carrying out polar switching, every column scan line is driven by the periodic voltage spike train, the scan period 50 of each potential pulse row is about half of horizon scan line cycle 60 or is lower than half, when potential pulse is delivered to TFT control utmost point open channel among the first column scan line G (1) and source electrode drive circuit is sent signal into electrode and charged, the 3rd column scan line G (3) also controls TFT the utmost point synchronously and opens the reception source signal at the same time, so carry out a pulse scan period, be this picture frame time (frame time)/column scan line sum this cycle length, for example under the scan period of 60Hz, each picture frame time is 1/60 second, under resolution with 1024 * 768XGA, this column scan line is 768 row, then its time scan period of each column scan line is 1/60/768 then, is about 21.7 microseconds; After the pulse scan period finishes, promptly close the control utmost point signal of first row and the 3rd column scan line, and secondary series sweep trace G (2) is scanned, and charge for the 4th column scan line G (4) simultaneously with same polarity; When next the 3rd column scan line G (3) being charged owing to when the charging process of the first column scan line G (1), carried out, therefore can in scan period, finish less than potential pulse, with this G (1)/G (3), G (2)/G (4), G (3)/G (6) ... G (N-2)/order of G (N) continues to carry out until last row.
With reference to Fig. 6 A, Fig. 6 B is depicted as the preliminary filling method of carrying out two-wire reversal of poles (2Line Inversion) with the present invention, the driving that is connected in the control utmost point driving circuit of all sweep traces is in proper order: when previous time-frame frame (N-1), the polarity that each sweep trace presented is then different the putting in order of polarity of adjacent two column scan lines, promptly when the first column scan line G (1) and secondary series sweep trace G (2) show electrode (Pixel Electrode) voltage are negative voltage with respect to the voltage of ordinary electrode (Common Electrode), then the 3rd column scan line G (3) and the 4th column scan line G (4) show electrode voltage are positive voltage with respect to the voltage of ordinary electrode, the 5th column scan line G (5) and the 6th column scan line G (6) show electrode voltage are again negative voltage with respect to the voltage of ordinary electrode ... with the different series arrangement of sweep trace polarity of these adjacent two row, and when being across to present time-frame frame N and carrying out polar switching, every column scan line is driven by the periodic voltage spike train, when potential pulse is delivered to TFT control utmost point open channel among the first column scan line G (1) and source electrode drive circuit is sent signal into electrode and charged, the 5th column scan line G (5) also controls TFT the utmost point synchronously and opens the reception source signal at the same time, so carry out a pulse scan period, that is that scan simultaneously when (1) as scanning article one sweep trace G is the 5th sweep trace G (5) but not the 3rd sweep trace G (3), the 6th sweep trace G of synchronous scanning (6) when scanning second sweep trace G (2), continue in proper order to carry out until last column scan line G (N) with this, because of the polar switching order is that even number bar sweep trace repeats correspondence but not odd number bar repetition correspondence, that is (+) (+) (-) (-) four column scan lines repeat corresponding but not (+) and (+) with next group (+) (+) (-) (-), (+) and (-), it is corresponding that (-) and the order of (-) repeat, and so could can not cause polarity opposite to carrying out synchronous preliminary filling.
Same mode realizes on the preliminary filling method of single two-wire reversal of poles (1+2Line Inversion), with reference to Fig. 7 A, shown in the 7B, and the driving that is connected in the control utmost point driving circuit of all sweep traces is in proper order: when previous time-frame frame (N-1), the polarity that each sweep trace presented is that the first column scan line presents independent polarity, sweep trace afterwards then is different the putting in order of adjacent two column scan line polarity, promptly when first column scan line G (1) show electrode (Pixel Electrode) voltage is negative voltage with respect to the voltage of ordinary electrode (Common Electrode), then secondary series sweep trace G (2) and the 3rd column scan line G (3) show electrode voltage are positive voltage with respect to the voltage of ordinary electrode, the 4th column scan line G (4) and the 5th column scan line G (5) show electrode voltage are again negative voltage with respect to the voltage of ordinary electrode, sweep trace afterwards is all with the different series arrangement of these adjacent two column scan line polarity, and be to repeat corresponding principle with even number bar sweep trace to carry out preliminary filling equally, that scan simultaneously when scanning article one sweep trace G (1) is the 5th sweep trace G (5), the 6th sweep trace G of synchronous scanning (6) when scanning second sweep trace G (2), continue in proper order to carry out until last column scan line G (N) with this, so (+) (-) (-) (+) could to organize (+) (-) (-) (+) corresponding and can polarity not opposite with next.
The above is preferred embodiment of the present invention only, is not in order to limit practical range of the present invention.Person skilled in the art scholar should understand various embodiment and change to such an extent that do not breaking away from following execution of summarizing spirit and scope of the present invention, scope of the present invention is limited by the claim that the claim of enclosing is applied for, equates that with claim meaning of the present invention the interior various modifications of making that reach in claim all are regarded as being contained in the claim of the present invention.
Claims (15)
1. the pre-charging scanning method of a LCD panel of thin-film transistor is characterized in that, this method be with the panel of LCD driving circuit to the different sweep trace of every adjacent column polarity, carry out the charging of two column scan lines simultaneously, the step of this method comprises:
At a picture frame in the time, when wherein each column scan line charged to this TFT thin film transistor monitor panel, the thin film transistor (TFT) of opening simultaneously on the adjacent secondary series sweep trace of these row carried out precharge; And
After this finishes in column scan line duration of charging, close the thin film transistor (TFT) on the adjacent secondary series sweep trace of these row and these row.
2. method according to claim 1 is characterized in that, the charging order of this sweep trace is to be downward circulation, and the adjacent secondary series sweep trace of this sweep trace, is to be downward adjacent secondary series sweep trace.
3. method according to claim 1 is characterized in that, the charging order of this sweep trace is for to cocycle, and the adjacent secondary series sweep trace of this sweep trace, is to be the adjacent secondary series sweep trace that makes progress.
4. method according to claim 1, it is characterized in that, after this finishes in column scan line duration of charging, close the step of the thin film transistor (TFT) on the adjacent secondary series sweep trace of these row and these row, further comprise charging and the precharge step of proceeding the next column sweep trace.
5. method according to claim 1, it is characterized in that, all sweep traces all are connected to scan line drive circuit, and this scan line drive circuit is designed to select wherein row of all sweep traces and the adjacent secondary series of these row, charges simultaneously and precharge action.
6. the pre-charging scanning method of a LCD panel of thin-film transistor, it is characterized in that, this method be with the panel of LCD driving circuit to every different sweep trace of adjacent two row polarity, carry out the charging of two sweep traces simultaneously, the step of this method comprises:
At a picture frame in the time, when wherein each column scan line charged to this TFT thin film transistor monitor panel, the thin film transistor (TFT) of opening simultaneously on adjacent the 4th column scan line of these row carried out precharge; And
After this finishes in column scan line duration of charging, close the thin film transistor (TFT) on adjacent the 4th column scan line of these row and these row.
7. method according to claim 6 is characterized in that, the charging order of this sweep trace is to be downward circulation, and adjacent the 4th column scan line of this sweep trace, is to be downward adjacent secondary series sweep trace.
8. method according to claim 6 is characterized in that, the charging order of this sweep trace is for to cocycle, and adjacent the 4th column scan line of this sweep trace, is to be the adjacent secondary series sweep trace that makes progress.
9. method according to claim 6, it is characterized in that, after this finishes in column scan line duration of charging, close the step of the thin film transistor (TFT) on adjacent the 4th column scan line of these row and these row, further comprise charging and the precharge step of proceeding the next column sweep trace.
10. method according to claim 6, it is characterized in that, all sweep traces all are connected to scan line drive circuit, and this scan line drive circuit is designed to select wherein row of all sweep traces and adjacent the 4th row of these row, charges simultaneously and precharge action.
11. the pre-charging scanning method of a LCD panel of thin-film transistor, it is characterized in that, this method is with the panel of LCD driving circuit first row to be presented independent polarity and every different sweep trace of adjacent two row polarity, carry out the charging of two sweep traces simultaneously, the step of this method comprises:
At a picture frame in the time, when wherein each column scan line charged to this TFT thin film transistor monitor panel, the thin film transistor (TFT) of opening simultaneously on adjacent the 4th column scan line of these row carried out precharge; And
After this finishes in column scan line duration of charging, close the thin film transistor (TFT) on adjacent the 4th column scan line of these row and these row.
12. method according to claim 11 is characterized in that, the charging order of this sweep trace is to be downward circulation, and adjacent the 4th column scan line of this sweep trace, is to be downward adjacent secondary series sweep trace.
13. method according to claim 11 is characterized in that, the charging order of this sweep trace is for to cocycle, and adjacent the 4th column scan line of this sweep trace, is to be the adjacent secondary series sweep trace that makes progress.
14. method according to claim 11, it is characterized in that, after this finishes in column scan line duration of charging, close the step of the thin film transistor (TFT) on adjacent the 4th column scan line of these row and these row, further comprise charging and the precharge step of proceeding the next column sweep trace.
15. method according to claim 11, it is characterized in that, all sweep traces all are connected to scan line drive circuit, and this scan line drive circuit is designed to select wherein row of all sweep traces and adjacent the 4th row of these row, charges simultaneously and precharge action.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN200410080656A CN100582898C (en) | 2004-09-29 | 2004-09-29 | Pre-charging scanning method for thin film transistor LCD panel |
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| Application Number | Priority Date | Filing Date | Title |
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| CN200410080656A CN100582898C (en) | 2004-09-29 | 2004-09-29 | Pre-charging scanning method for thin film transistor LCD panel |
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| CN1755467A true CN1755467A (en) | 2006-04-05 |
| CN100582898C CN100582898C (en) | 2010-01-20 |
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| CN200410080656A Expired - Fee Related CN100582898C (en) | 2004-09-29 | 2004-09-29 | Pre-charging scanning method for thin film transistor LCD panel |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102592537A (en) * | 2011-12-16 | 2012-07-18 | 友达光电股份有限公司 | Driving method of pixel circuit |
| CN103413532A (en) * | 2013-07-26 | 2013-11-27 | 京东方科技集团股份有限公司 | Pixel drive circuit, pixel drive method, array substrate and liquid display device |
| CN106409252A (en) * | 2016-09-22 | 2017-02-15 | 京东方科技集团股份有限公司 | Array substrate and driving method thereof, display panel and display device |
-
2004
- 2004-09-29 CN CN200410080656A patent/CN100582898C/en not_active Expired - Fee Related
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102592537A (en) * | 2011-12-16 | 2012-07-18 | 友达光电股份有限公司 | Driving method of pixel circuit |
| CN103413532A (en) * | 2013-07-26 | 2013-11-27 | 京东方科技集团股份有限公司 | Pixel drive circuit, pixel drive method, array substrate and liquid display device |
| CN103413532B (en) * | 2013-07-26 | 2015-07-01 | 京东方科技集团股份有限公司 | Pixel drive circuit, pixel drive method, array substrate and liquid display device |
| US9378698B2 (en) | 2013-07-26 | 2016-06-28 | Boe Technology Group Co., Ltd. | Pixel driving circuit and method, array substrate and liquid crystal display apparatus |
| CN106409252A (en) * | 2016-09-22 | 2017-02-15 | 京东方科技集团股份有限公司 | Array substrate and driving method thereof, display panel and display device |
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| Publication number | Publication date |
|---|---|
| CN100582898C (en) | 2010-01-20 |
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