CN100507650C - Overdrive compensation method capable of reducing passiveness matrix type LCD reaction time - Google Patents
Overdrive compensation method capable of reducing passiveness matrix type LCD reaction time Download PDFInfo
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- CN100507650C CN100507650C CNB2006101286815A CN200610128681A CN100507650C CN 100507650 C CN100507650 C CN 100507650C CN B2006101286815 A CNB2006101286815 A CN B2006101286815A CN 200610128681 A CN200610128681 A CN 200610128681A CN 100507650 C CN100507650 C CN 100507650C
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Abstract
An overdriving compensation method by reducing the reaction time of the passive-matrix LCD is provided, which is to combine N picture frames into one super frame and to compare the new frame data with the former one. The difference existed between the two shows a dynamic picture. Then to give an overdriving voltage lower or higher than the original traditional high voltage or low voltage according to the i-th frame to the j-th frame in each super frame to make the liquid crystal achieve or approach the given target brightness in less time.
Description
Technical field
The present invention relates to a kind of driving method of passive matrix type LCD, particularly a kind of amplitude at passive matrix type LCD (LCD) selects to drive (APT), utilizes the method for the compensation of overdriving to make the dynamic menu broadcast more smooth.
Background technology
Because the compact characteristic of LCD, and lower than the power consumption of traditional C RT display, make that LCD replaces CRT monitor gradually in recent years.
If liquid crystal flat panel display can be divided into passive-matrix type (Passive Matrix-LCD according to driving display packing; PM-LCD) with active-matrix type (Active Matrix-LCD; AM-LCD) two kinds.The type of drive of PM-LCD is on upper and lower two face glasss, the transparent ITO of row (X) direction (Indium Tin Oxide) electrode is set on a panel respectively, row (Y) direction electrode is set on another panel, after two panels is fitted (middle filling liquid crystal), the clathrate position that upper and lower panel formation electrode is reported to the leadship after accomplishing a task is exactly the pixel (Pixel) of display panel, the electrode of two directions is that two electrode potentials that provide driving voltage to control pixel by the outside are poor, reaches the rotation that drives liquid crystal in the pixel.
The type of drive of AM-LCD is the auxiliary capacitor that on-off element and storage assembly are set on each the location of pixels point on the panel, each pixel drive is independently to be controlled by the element on the pixel, because AM-LCD places thin film transistor (TFT) (TFT) element on the panel, the just normal TFT-LCD that claims.
Please refer to shown in Figure 1ly, is the passive-matrix type LCD (configuration diagram of m * n).Common stable twisted nematic (TN) all belongs to the PM-LCD product with STN Super TN type (STN), itself there is not the operation of nonlinear element control liquid crystal pixel, so the formation of each pixel 1 is the overlapping region of (Common) electrode 2 cablings altogether with vertical data (Segment) electrode 3 cablings of level.
The basic principle of operation of PM-LCD is an electrooptical effect of utilizing liquid crystal material that the root-mean-square value (RMS) of applying voltage is produced, the reaction time of liquid crystal material must be much larger than the scan period that drives pulse wave, if picture frame sweep frequency (Frame rate) is 60Hz, the time interval that each bar horizontal scanning line (common electrode 2) is selected is 16.67ms, the then required liquid crystal material reaction time is generally 200ms, and this is the necessary condition of liquid crystal to root-mean-square value (RMS) reaction.
But, traditional amplitude selects to drive (APT) mode, if in the time of will showing dynamic menu, because the reaction time of liquid crystal material is slow excessively, can cause the phenomenon of moving image smear, if use the rapid-action liquid crystal material, can cause the serious flicker of picture (Flicker) phenomenon, picture contrast simultaneously can significantly reduce.
Summary of the invention
For solving the problems of the technologies described above, the object of the present invention is to provide a kind of overdrive compensation method capable that reduces the passive matrix type LCD reaction time, it selects to drive (APT) for the stable twisted nematic (TN) and the amplitude of STN Super TN type passive-matrix type LCD such as (STN), can shorten the reaction time of liquid crystal, do not need to use the rapid-action liquid crystal material, LCD just can be play dynamic menu very swimmingly.
For achieving the above object, overdrive compensation method capable according to the minimizing passive matrix type LCD reaction time of the present invention, at the used driving method of traditional passive-matrix type LCD (stable twisted nematic and STN Super TN type) is that amplitude selects to drive (APT), and N picture frame of data electrode view data formed a hypergraph frame (Super-frame); And do the judgement of dynamic menu at bus (Bus) rear of input data, the drawing frame data of the drawing frame data of newly coming in and last pen is compared mutually, as long as find that the data of coming in are different with last data, just expression is a dynamic menu, then, driving high voltage or the higher or lower overdrive voltage of low-voltage at i the given original traditional data electrode of ratio of picture frame to a j picture frame in each hypergraph frame, 2≤N wherein, 1≤i, j≤N, this overdrive voltage is more than or equal to 0 volt, and smaller or equal to the ceiling voltage of liquid crystal drive.Thus, make the liquid crystal between common electrode and data electrode can in the shorter time, reach or approaching given high-tension object brightness.
In addition, the present invention can be at the given different overdrive voltage values of different pictures, after the mode of tabling look-up by the utilization of the computing of tabling look-up (LUT) circuit goes to table look-up, send corresponding output voltage values of overdriving, the output voltage values that is sent can correspondence go out the correct output overdrive voltage of data electrode, so can effectively shorten the used driving method of traditional passive-matrix type LCD (stable twisted nematic and STN Super TN type) is that amplitude selects to drive the reaction time of (APT), significantly reduces the serious smear phenomenon of playing dynamic menu.
In sum.The overdrive compensation method capable in minimizing passive matrix type LCD reaction time of the present invention makes the liquid crystal between common electrode and data electrode to reach in the shorter time or approaching given high-tension object brightness, and can effectively shorten traditional used driving method of passive-matrix type LCD is the reaction time that amplitude is selected driving, significantly reduces the serious smear phenomenon of playing dynamic menu.
Description of drawings
Fig. 1 is the passive-matrix type LCD (configuration diagram of m * n).
Fig. 2 is the drive waveforms synoptic diagram of traditional passive-matrix type LCD the 1st row n row pixel.
Fig. 3 is the drive waveforms synoptic diagram of passive-matrix type LCD the 1st row n row pixel of the present invention.
Fig. 4 is the computing block schematic diagram of tabling look-up of overdrive circuit of the present invention.
Fig. 5 is the computing block schematic diagram of tabling look-up of overdrive circuit of the present invention.
Embodiment
Relevant detailed content of the present invention and technical descriptioon now are described further with embodiment, but will be appreciated that this embodiment only is used to illustrate, and should not be interpreted as restriction of the invention process.
Please refer to shown in Figure 2ly, is the drive waveforms synoptic diagram of traditional passive-matrix type LCD the 1st row n row pixel.The used driving method of traditional passive-matrix type LCD (stable twisted nematic and STN Super TN type) is that amplitude select to drive (APT) and comprises synchronizing frequency information Vs, common electrode signal COM1 and data-signal SEGn (illustrating with the 1st row n row pixel), and traditional driving method is that data electrode to all picture frames (frame) is according to reference voltage V 4 given identical high voltage V2 or identical low-voltage V6.
Please refer to shown in Figure 3ly, is the drive waveforms synoptic diagram of passive-matrix type LCD the 1st row n row pixel of the present invention.The embodiment of patented technology of the present invention is described as follows, and supposes that a hypergraph frame (Super-frame) formed N=4 by four picture frames (frame); Do the judgement (as shown in Figure 4) of dynamic menu through picture decision circuitry 11 at bus (Bus) rear of input data, this circuit can compare the drawing frame data of the drawing frame data of newly coming in and last pen mutually, as long as find that the data of coming in are different with last data, just expression is a dynamic menu, then picture decision circuitry 11 is flexibly at the overdrive voltage V ' of i picture frame to a j picture frame original traditional high voltage V2 of a given ratio (or low-voltage V6) higher (or lower as earthing potential GND) in each hypergraph frame, 1≤i wherein, j≤4, and the ceiling voltage of 0≤V '≤liquid crystal drive.Shown in Figure 3 is I=2, the example of j=3; Each picture frame is all decided the overdrive voltage V ' of an original traditional high voltage V2 of ratio (or low-voltage V6) higher (or lower as earthing potential GND) in can certainly each hypergraph frame, or the i in each hypergraph frame and j picture frame be overdrive voltage V ' (I=1 for example, j=4).Thus, make the liquid crystal of 3 of common electrode 2 and data electrodes in the shorter time, to reach or near the object brightness of given high voltage V2.
To select the basic principle of operation of driving (APT) be the electrooptical effect of utilizing liquid crystal material that the root-mean-square value (RMS) of applying voltage is produced because traditional used driving method of passive-matrix type LCD (stable twisted nematic and STN Super TN type) is an amplitude, do not have serious flicker (Flicker) phenomenon behind the overdrive voltage penalty method process root-mean-square value therefore of the present invention (RMS), and improve the picture contrast.
In addition, the present invention can be at the value of the given different overdrive voltage V ' of different pictures, the existing drawing frame data that this picture decision circuitry 11 can will newly be come in compares mutually with the last drawing frame data that before was stored in the storage device 111 that is arranged at drive IC inside (or outside), if expression inequality is a dynamic menu, after utilizing the mode of tabling look-up to go to table look-up by the computing of tabling look-up (LUT) circuit 112 again, send corresponding output voltage values of overdriving.The computing of tabling look-up is to use the array of an index to be used as new overdrive voltage V ' value table, the calculation that some are non-linear and complicated is integrated into constant summarizes, make and omitted complicated calculating in the whole calculating process, improved the image processing efficient of the shadow matter of essence.And the output voltage values that is sent can correspondence goes out data electrode 3 and correctly exports overdrive voltage V ', so can effectively shorten the used driving method of traditional passive-matrix type LCD (stable twisted nematic and STN Super TN type) is that amplitude selects to drive the reaction time of (APT), significantly reduces the serious smear phenomenon of playing dynamic menu.
The main spirit of the present invention be with large scale initiatively matrix form (Active Matrix) Thin Film Transistor-LCD (TFT LCD) concept of improving (Over driving) penalty method of overdriving in dynamic menu reaction time be applied in and reverse line style liquid crystal and super reversing on line style (TN/STN) the passive matrix type liquid crystal display (LCD); Add that it is the electrooptic effect of utilizing liquid crystal material that the alive root-mean-square value of execute (RMS) is produced that amplitude is selected the basic principle of operation of driving (APT), does not have serious flicker (Flicker) phenomenon behind the overdrive voltage penalty method process root-mean-square value therefore of the present invention (RMS).
The above is the preferred embodiments of the present invention only, is not limited to the present invention.In the above-described embodiments, the present invention can have various changes and variation.Within the spirit and principles in the present invention all, any modification of being done, be equal to replacement, improvement etc., all should be included within protection scope of the present invention.
Claims (1)
1. an overdrive compensation method capable that reduces the passive matrix type LCD reaction time is selected to drive at the used amplitude of traditional passive-matrix type LCD, it is characterized in that comprising following driving method:
N in the data electrode view data picture frame formed a hypergraph frame, and compare mutually in input the data drawing frame data that will newly come in and the drawing frame data that is stored in the last pen in the storage device in advance, when the data of newly coming in different with last data, after importing a meter-checking computing circuit respectively and going to table look-up, at the high voltage or the higher or lower overdrive voltage of low-voltage of i the given original conventional ADS driving of ratio of picture frame to a j picture frame in each hypergraph frame in the mode of tabling look-up;
2≤N wherein, 1≤i, j≤N; Described overdrive voltage is more than or equal to 0 volt, and smaller or equal to the ceiling voltage of liquid crystal drive.
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| Application Number | Priority Date | Filing Date | Title |
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| CNB2006101286815A CN100507650C (en) | 2006-09-08 | 2006-09-08 | Overdrive compensation method capable of reducing passiveness matrix type LCD reaction time |
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| CNB2006101286815A CN100507650C (en) | 2006-09-08 | 2006-09-08 | Overdrive compensation method capable of reducing passiveness matrix type LCD reaction time |
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| CN100507650C true CN100507650C (en) | 2009-07-01 |
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| US20090179849A1 (en) * | 2008-01-15 | 2009-07-16 | Hua Wu | Image displaying method, device, and related liquid crystal display panel |
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