CN100375135C - Method for driving panel display - Google Patents
Method for driving panel display Download PDFInfo
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- CN100375135C CN100375135C CNB2005100889878A CN200510088987A CN100375135C CN 100375135 C CN100375135 C CN 100375135C CN B2005100889878 A CNB2005100889878 A CN B2005100889878A CN 200510088987 A CN200510088987 A CN 200510088987A CN 100375135 C CN100375135 C CN 100375135C
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Abstract
The present invention relates to a method for driving a panel display, wherein the panel display is provided with n scan lines, and the n is a positive integer which is larger than 1. In addition, each scan line is coupled with a plurality of pixels. The present invention comprises the following steps: when the pixel on the kth scan line is enabled, the pixels on the first scan line to the (k-1)th scan line are disabled, and the pixels on at least one part of the scan line in the (k+1)th scan line to the nth scan line are enabled in order to precharge the pixels, wherein the k is a positive integer. In addition, the present invention can reduce the current consumption of the display.
Description
Technical field
The present invention relates to a kind of flat display driving method, and particularly relate to a kind of utilization change sweep signal and reach and reduce the source electrode driver power consumption, and and then reduce the flat display driving method of the current sinking of system.
Background technology
In order to cooperate modern life pattern, it is frivolous that the volume of video or image device day by day is tending towards.Traditional cathode-ray tube display (CRT) though still have its advantage, because the structure in internal electron chamber, makes that display is bulky and takes up space, and still has radiant rays to hinder problems such as eye when showing.Therefore, the plane formula display (Flat Panel Display) that cooperates photoelectric technology and semiconductor fabrication to be developed, for example LCD (LCD), organic light emitting display (OLED) or plasma scope (PlasmaDisplay Panel, PDP), become the main flow of display product gradually.
Because the resolution and the renewal frequency of flat-panel screens improve constantly, and make that the renewal frequency of sweep trace is also more and more faster, and the requirement of this respect conflicts mutually with the design that system design engineer is saved system's electricity consumption.Therefore, come out with regard to the technical development that has had intelligent electric charge to share (Smart Charge Sharing).
Figure 1A is a synoptic diagram of sharing technology according to the existing charge that American National semiconductor center is provided by Craig Zajac with Figure 1B.Please, in flat-panel screens 100, source electrode driver 110 and pel array 130 have been comprised earlier with reference to Figure 1A.Wherein, pel array 130 has many data line DL0～DLm, and it is connected to source electrode driver 110 jointly.
In source electrode driver 110, comprised a plurality of output amplifier A1～Am, and the output terminal of each output amplifier is all distinguished the corresponding wherein data line that connects.In addition, also comprised a plurality of switch SW 1～SWm-1 in the source electrode driver 110, it is used for connecting two adjacent data lines.For example, switch SW 1 is to connect adjacent data line DL0 and DL1.In Figure 1A, each data line all can be considered resistance R, the capacitor C load summation of the output amplifier of correspondence.
Before source electrode driver 110 begins to drive pel array 130, the voltage on each adjacent data line, all be in respectively on the common voltage or under, at this moment, all switch SW 1～SWm-1 are the states of escape (Turn off).When source electrode driver 110 begins to drive moment of pel array 130, all switch SW 1～SWm-1 can be transformed into conducting (Turn on) state, just shown in Figure 1B.In this moment, all output amplifier A1～Am are forbidden energy (Disable) state, just so-called " high impedance (Hi-Z) " pattern, so output amplifier A1～Am can not consume any electric current.And because switch SW 1～SWm-1 is a conducting state, so electric current can flow to the also low data line of voltage ratio common voltage from the also high data line of voltage ratio common voltage, its path is just as arrow among Figure 1B is indicated.So, just can reach the purpose of charging neutrality.And when through after the high impedance mode, switch SW 1～SWm-1 is escape again again, and at this moment, source electrode driver 110 just can drive pel array 130 normally.
In sum, electric charge is shared the operation principles of technology, and the energy (electric charge) that will store exactly in each data line is redistributed, and need not power drain and just can drive each horizontal scanning line to half of its final numerical value.Therefore, electric charge is shared the small-sized plane display that technology is less for load and resolution is lower very enough.But in case slow down, its usefulness also can be along with reduction when the average revolution rate (Overall Slew Rate) of source electrode driver 110.This so just can not satisfy its requirement far away for requiring high resolving power, high capacity and large-sized flat-panel screens of new generation.
Summary of the invention
Purpose of the present invention is providing a kind of flat display driving method exactly, can reduce the power consumption of large scale flat-panel screens effectively.
The invention provides a kind of flat display driving method, be suitable for driving flat-panel screens with a pel array; Wherein, pel array has n bar sweep trace at least, and n is a positive integer, and each sweep trace all can couple a plurality of pixels.Driving method provided by the present invention has comprised following step: at first, flat-panel screens can produce the one scan signal and come the pixel that coupled on activation (enable) the k bar sweep trace, and k is a positive integer.When k ≈ 1, the pixel that the 2nd of activation coupled to the sweep trace of small part to the n bar sweep trace.As k during greater than 1 but less than n, the pixel that coupled to the k-1 bar sweep trace of the 1st of forbidden energy (disable) then, and in activation k+1 bar to the n bar sweep trace to the pixel that sweep trace coupled of small part.And if k is when equaling n, the pixel that coupled to the n-1 bar sweep trace of the 1st of forbidden energy then.Then, flat-panel screens can produce data-signal to pel array.
When the pixel on the activation k bar sweep trace and k when equaling 1, then the 2nd to n bar sweep trace, activation have with the 1st sweep trace on all pixels of the described pixel identical polar that coupled.
The described pixel that described pixel on activation k bar sweep trace, and k equals at 1 o'clock, the 2nd of activation are coupled on the predetermined number sweep trace in all odd number bar sweep traces or all the odd number bar sweep traces to the n bar sweep trace.
The step of the pixel of the pixel identical polar that is coupled on activation and the 1st sweep trace comprises: produce a plurality of redundant sweep signals, wherein each redundant sweep signal provide to have with the 1st sweep trace in the sweep trace that pixel coupled of the described pixel identical polar that coupled with a corresponding sweep trace of this redundancy sweep signal on.
Described pixel on activation k bar sweep trace, and k is during greater than 1 but less than n, then in k+1 bar to the n bar sweep trace, activation have with k bar sweep trace on all pixels of the described pixel identical polar that coupled.
Described pixel on activation k bar sweep trace, and k is greater than 1 but less than n, and k is when being odd number, the then described pixel that is coupled on the predetermined number sweep trace in all odd number bar sweep traces or all the odd number bar sweep traces in activation k+1 bar to the n bar sweep trace.
Described pixel on activation k bar sweep trace, and k is greater than 1 but less than n, and k is when being even number, the then pixel that is coupled on the predetermined number sweep trace in all even number bar sweep traces or all the even number bar sweep traces in activation k+1 bar to the n bar sweep trace.
The step of the pixel of the pixel identical polar that is coupled on activation and the k bar sweep trace comprises: produce a plurality of redundant sweep signals, wherein each redundant sweep signal provide to have with k bar sweep trace in the sweep trace that pixel coupled of the described pixel identical polar that coupled with a corresponding sweep trace of this redundant signals on.
From another viewpoint, the invention provides a kind of flat display driving method, wherein flat-panel screens has a plurality of pixels, and arranges with array way.Driving method provided by the present invention is characterised in that: the pixel of arranging when these array way wherein a row pixel is enabled the time, then activation simultaneously is arranged in all pixels after the pixel that is enabled.
Flat display driving method of the present invention also comprise when described pixel of arranging with array way wherein a row pixel is enabled the time, then forbidden energy is arranged in all pixels before the described pixel that is enabled.
In sum, when the pixel on activation k bar sweep trace, the pixel on a part of sweep trace in all the other sweep traces also can be enabled.This makes the pixel while that is coupled when data-signal that also the pixel that other can be enabled is carried out precharge on driving k bar sweep trace.Therefore, take seriously when to be ready driving, just do not need to consume too big electric current through the pixel on the precharge sweep trace.
Description of drawings
Figure 1A is the synoptic diagram that a kind of existing charge is shared technology with Figure 1B;
Fig. 2 is the circuit block diagram of a kind of LCD of a preferred embodiment of the present invention;
Fig. 3 is the flow chart of steps of a kind of flat display driving method of a preferred embodiment of the present invention;
Fig. 4 A is the reversal of poles synoptic diagram of sub-pixel in the LCD to Fig. 4 D;
Fig. 5 is the sequential chart of a kind of sweep signal of a preferred embodiment of the present invention.
The main element symbol description:
100: flat-panel screens
110,221: source electrode driver
130,210: pel array
212,214,216,218: pixel
223: gate drivers
225: sequential control circuit
A1～Am: output amplifier
DL0～DLm: data line
SL1～SLn: sweep trace
SW1～SWm-1: switch
S301: generation one scan signal comes the pixel on the activation k bar sweep trace
S303：k＝？
S305: the 2nd to n bar sweep trace, the pixel on the activation part of scanning line
S307: the 1st of the forbidden energy pixel to the k-1 bar sweep trace, and in k+1 bar to the n bar sweep trace, the pixel on the activation part of scanning line
S309: the 1st of the forbidden energy pixel to the n-1 bar sweep trace
S311: produce data-signal to pel array
Embodiment
For purpose of the present invention, feature and advantage can be become apparent, especially exemplified by preferred embodiment, and cooperate appended graphicly, be described in detail below:
Fig. 2 is the circuit block diagram of a kind of flat-panel screens 200 of a preferred embodiment of the present invention.Please refer to Fig. 2, in flat-panel screens 200, comprised pel array 210, it is coupled to gate drivers 223 by multi-strip scanning line SL0～SLn respectively, and is coupled to source electrode driver 221 by many data line DL0～DLm.Wherein, n and m are all the positive integer greater than 1.In addition, in LCD 200, also have sequential control circuit 225, it can be used for control example such as source electrode driver 221 and gate drivers 223.
In pel array 210, data line DL0～DLm is arranged in parallel each other along first direction, and sweep trace SL1～SLn is arranged in parallel each other along second direction.Wherein, first direction and second direction each other can be for orthogonal.In addition, data line DL0～DLm and sweep trace SL1～SLn arrangement interlaced with each other, but also contactless each other.
In the zone that each data line and sweep trace enclosed, all dispose a pixel.For example, at data line DL1 and DL2, and in sweep trace SL1 and the SL2 zone of being enclosed, dispose pixel 212.Each pixel all has gate terminal and source terminal, connects corresponding scanning line and data line respectively.For example, the gate terminal of pixel 212 couples corresponding scanning line SL1, and source terminal then couples corresponding data line DL1.Owing in the patent that is exposed in many pieces of writing that the structure of pixel and principle of work are detailed, and, therefore will pixel not given a detailed account in the present invention for avoiding those skilled in the art that to obscure spirit of the present invention.
Fig. 3 is the flow chart of steps of a kind of flat display driving method of a preferred embodiment of the present invention.Please merge with reference to Fig. 2 and Fig. 3,, shown in step S301, when producing sweep signal and coming pixel on the activation k bar sweep trace, then, why judge the k value as described in the step S303 when sequential control circuit 225 control gate drivers 223.Suppose that k is 1 (being exactly the k=1 that is indicated on the step S303), that is to say, gate drivers 223 is wanted the pixel that coupled on activation article one sweep trace (SL0), for example pixel 214 and 216 o'clock, then gate drivers 223 is as described in the step S305, at the 2nd sweep trace (SL1) to n bar sweep trace (SLn), the pixel that activation is coupled on the part of scanning line at least.And the detailed step of the pixel on the activation sweep trace has a complete narration following.
If above-mentioned k is for greater than (being exactly 1＜k of being indicated on the step S303＜n) 1 during less than the positive integer of n, then gate drivers 223 can be as described in the step S307, the 1st of the forbidden energy pixel to the k-1 bar sweep trace, and in k+1 bar sweep trace to the n bar sweep trace, the pixel that is coupled on the activation part of scanning line.For example, when k equals 3, when that is to say the pixel (as pixel 218) that on the 3rd sweep trace of activation (SL2), is coupled when gate drivers 223, then gate drivers 223 will forbidden energy the 1st and the 2nd sweep trace on the pixel that coupled, then in the 4th sweep trace to the n bar of the activation sweep trace, the pixel that is coupled on the part of scanning line.
When k equals n (being exactly the k=n that is indicated on the step S303), that is to say the pixel of gate drivers 223 on activation the last item sweep trace, the then pixel that will the 1st sweep trace of forbidden energy be coupled to the n-1 bar sweep trace of gate drivers 223.And when gate drivers 223 according to the situation of reality finish step S305, step S307 and step S309 three one of them the time, then sequential control circuit 225 will be controlled source electrode drive circuit 221 and produce data-signal, and send in the pel array 210 from data line DL0～DLm in regular turn, just as described in the step S311.
Owing to during the pixel that the present invention is coupled on activation k bar sweep trace, also have the pixel on the part of scanning line to be enabled.Thus, when source electrode driver 221 produced data-signals and drives pixel on the k bar sweep trace, other pixel that is enabled also can be carried out precharge simultaneously.Therefore, the pixel on each bar sweep trace all can be by precharge before by real the driving, and by the time really will be driven the time, only need lower electric current just can reach the display effect of wanting.Thus, just can reach the purpose that reduces current drain, and and then reduce the power attenuation of total system.
For the LCD in the flat-panel screens,, can not be fixed under the some voltage exactly because liquid crystal molecule itself has a specific character always.Otherwise of long duration, even voltage is got rid of, the liquid crystal molecule meeting can't be again along with the variation of electric field is rotated because its characteristic is destroyed.So for LCD, at set intervals,, still must change the voltage that is applied on the liquid crystal, be destroyed with the characteristic of avoiding liquid crystal molecule even shown picture does not change.And in the type of drive of display panels, the method for reversal of poles is very important.
LCD with 1024 * 768 is an example, and it has 1024 row (data line), and the pixel of 768 row (sweep trace), 3 sub-pixels (sub-pixel) that have three kinds of colors of red, green, blue in each pixel.And for each sub-pixel in each pixel, the method for its reversal of poles is to carry out in following mode basically.Exactly the voltage difference that puts on the liquid crystal molecule two ends is divided into two kinds of positive electricity pressure reduction and negative electricity pressure reduction.Therefore can have positive polarity or negative polarity after liquid crystal molecule is applied in voltage.
Fig. 4 A is the reversal of poles synoptic diagram of sub-pixel in the LCD to Fig. 4 D.Generally speaking, the method of reversal of poles, comprise the row counter-rotating (RowInversion) of the picture counter-rotating (Frame Inversion) shown in Fig. 4 A, Fig. 4 B, the row counter-rotatings (Column Inversion) of Fig. 4 C, and the point of Fig. 4 D counter-rotating (DotInversion).If the present invention is applied on the LCD with reversal of poles operation, as mentioned above, when the pixel on the k bar sweep trace is enabled, then in k+1 bar sweep trace to the n bar sweep trace, can select activation have with k bar sweep trace on pixel the pixel of identical polar is arranged.LCD with 1024 * 768 is an example, suppose that this LCD is the row reverse turn operation, if and the pixel on the 1st sweep trace is when being enabled, then in 768 sweep traces of the 2nd sweep trace to the, the present invention can select the pixel that coupled on the odd number of the activation simultaneously bar sweep trace.That is to say, if a LCD is the row reverse turn operation, then the pixel on k bar sweep trace is enabled, and k is when being odd number, then the present invention understands activation k+1 pixel on the odd number bar sweep trace to the last item sweep trace, if and k is an even number, then the present invention will activation k+1 to the last item sweep trace the pixel on the even number bar sweep trace.
Fig. 5 is the sequential chart of a kind of sweep signal of a preferred embodiment of the present invention.Sweep signal sequential chart as shown in Figure 5 goes for having the LCD of row conversion operations.When the sweep signal S1 of the pixel on the 1st sweep trace of activation is enabled, then on the 2nd the sweep trace odd number bar sweep trace afterwards redundant sweep signal, for example S3 and S5 can appear.Wherein, redundant sweep signal is to be used for pixel on the activation corresponding scanning line, so that it is carried out precharge action.In the same manner, when the sweep signal S2 of the pixel on the 2nd sweep trace of activation is enabled, then on the 3rd the sweep trace even number bar sweep trace afterwards redundant sweep signal can appear also, for example S4 and S6.And when the sweep signal S3 of the pixel on the 3rd sweep trace of activation is enabled, then being used for the sweep signal S1 and the S2 of the pixel on 2 sweep traces of the 1st sweep trace to the of activation will be by forbidden energy, and redundant sweep signal equally also can appear in the 4th sweep trace odd number bar sweep trace afterwards, so that the pixel on it is carried out precharge.
In other embodiment, when the pixel on the k bar sweep trace is enabled, k+1 bar sweep trace is in a last sweep trace, do not need the pixel on all odd numbers of activation simultaneously or the even number bar sweep trace, but only need the pixel on the predetermined number sweep trace in activation odd number or the even number bar sweep trace to get final product.By this, the present invention just goes for the flat-panel screens of virtually any size, does not drive hypodynamic situation generation and do not have.
Though the above embodiments all are applied in the LCD with row reverse turn operation, those skilled in the art should be pushed into the LCD or the flat-panel screens of other type voluntarily.
Though the present invention discloses as above with preferred embodiment; but it is not in order to limit the present invention; any those skilled in the art; in not breaking away from spirit of the present invention and technical scope; a little change and the retouching done; all should contain within the scope of the invention, so protection scope of the present invention should be as the criterion with the scope that claim is asked for protection.
Claims (10)
1. flat display driving method, be suitable for driving flat-panel screens, it is characterized in that described pel array has n bar sweep trace at least, and n be a positive integer with a pel array, and each sweep trace all couples a plurality of pixels, and described driving method comprises the following steps:
Produce the one scan signal and come the described pixel that coupled on the activation k bar sweep trace, and k is a positive integer;
When k=1, the described pixel that the 2nd of activation coupled on the part of scanning line to the n bar sweep trace at least;
As k during greater than 1 but less than n, the then described pixel that coupled to the k-1 bar sweep trace of the 1st of forbidden energy, and the described pixel that part of scanning line coupled at least in activation k+1 bar to the n bar sweep trace;
When k equals n, the described pixel that the 1st of forbidden energy coupled to the n-1 bar sweep trace; And
Produce a data-signal to described pel array.
2. flat display driving method according to claim 1, it is characterized in that: when the pixel on the activation k bar sweep trace and k when equaling 1, then the 2nd to n bar sweep trace, activation have with the 1st sweep trace on all pixels of the described pixel identical polar that coupled.
3. flat display driving method according to claim 2, it is characterized in that: the pixel on activation k bar sweep trace, and k equals at 1 o'clock, the described pixel that the 2nd of activation coupled on the predetermined number sweep trace in all odd number bar sweep traces or all the odd number bar sweep traces to the n bar sweep trace.
4. flat display driving method according to claim 2, it is characterized in that: the step of the pixel of the pixel identical polar that is coupled on activation and the 1st sweep trace comprises: produce a plurality of redundant sweep signals, wherein each redundant sweep signal provide to have with the 1st sweep trace in the sweep trace that pixel coupled of the described pixel identical polar that coupled with a corresponding sweep trace of this redundancy sweep signal on.
5. flat display driving method according to claim 1, it is characterized in that: the described pixel on activation k bar sweep trace, and k is during greater than 1 but less than n, then in k+1 bar to the n bar sweep trace, activation have with k bar sweep trace on all pixels of the described pixel identical polar that coupled.
6. flat display driving method according to claim 5, it is characterized in that: the described pixel on activation k bar sweep trace, and k is greater than 1 but less than n, and when k is odd number, the described pixel that is coupled on the predetermined number sweep trace in all odd number bar sweep traces or all the odd number bar sweep traces in activation k+1 bar to the n bar sweep trace then.
7. flat display driving method according to claim 5, it is characterized in that: the described pixel on activation k bar sweep trace, and k is greater than 1 but less than n, and when k is even number, the described pixel that is coupled on the predetermined number sweep trace in all even number bar sweep traces or all the even number bar sweep traces in activation k+1 bar to the n bar sweep trace then.
8. flat display driving method according to claim 5, it is characterized in that: the step of the pixel of the pixel identical polar that is coupled on activation and the k bar sweep trace comprises: produce a plurality of redundant sweep signals, wherein each redundant sweep signal provide to have with k bar sweep trace in the sweep trace that pixel coupled of the described pixel identical polar that coupled with a corresponding sweep trace of this redundancy sweep signal on.
9. flat display driving method, described flat-panel screens has a plurality of pixels, arranges with array way, it is characterized in that, when described pixel of arranging with array way wherein a row pixel is enabled the time, then activation simultaneously is arranged in all pixels after the described pixel that is enabled.
10. flat display driving method according to claim 9 is characterized in that: also comprise when described pixel of arranging with array way wherein a row pixel is enabled the time, then forbidden energy is arranged in all pixels before the described pixel that is enabled.
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| CNB2005100889878A CN100375135C (en) | 2005-08-04 | 2005-08-04 | Method for driving panel display |
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| CNB2005100889878A CN100375135C (en) | 2005-08-04 | 2005-08-04 | Method for driving panel display |
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| CN100375135C true CN100375135C (en) | 2008-03-12 |
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Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20030030615A1 (en) * | 2001-08-07 | 2003-02-13 | Kazuhiro Maeda | Matrix image display device |
| CN1513164A (en) * | 2001-06-08 | 2004-07-14 | 皇家菲利浦电子有限公司 | Addressing an array of display elements |
| CN1513163A (en) * | 2001-06-08 | 2004-07-14 | 皇家菲利浦电子有限公司 | Device and method for addressing LCD pixels |
| CN1530903A (en) * | 2003-03-17 | 2004-09-22 | 株式会社日立制作所 | Displaying device and driving method thereof |
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Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1513164A (en) * | 2001-06-08 | 2004-07-14 | 皇家菲利浦电子有限公司 | Addressing an array of display elements |
| CN1513163A (en) * | 2001-06-08 | 2004-07-14 | 皇家菲利浦电子有限公司 | Device and method for addressing LCD pixels |
| US20030030615A1 (en) * | 2001-08-07 | 2003-02-13 | Kazuhiro Maeda | Matrix image display device |
| CN1530903A (en) * | 2003-03-17 | 2004-09-22 | 株式会社日立制作所 | Displaying device and driving method thereof |
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