CN101581857B - Method for driving liquid crystal display - Google Patents
Method for driving liquid crystal display Download PDFInfo
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- CN101581857B CN101581857B CN2008100672681A CN200810067268A CN101581857B CN 101581857 B CN101581857 B CN 101581857B CN 2008100672681 A CN2008100672681 A CN 2008100672681A CN 200810067268 A CN200810067268 A CN 200810067268A CN 101581857 B CN101581857 B CN 101581857B
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Abstract
The invention relates to a method for driving a liquid crystal display. The liquid crystal display comprises a plurality of parallel scanning lines and a plurality of parallel data lines vertically crossed with the scanning lines. The method comprises the following steps: sequentially providing a plurality of scanning pulses to a plurality of scanning lines, wherein each scanning pulse comprises afirst scanning section and a second scanning section; providing a gray scale voltage corresponding to image data to the data lines at the first scanning section of each scanning pulse; and providing a gray scale voltage corresponding to a black image to the data lines at the second scanning section of each scanning pulse, wherein the gray scale voltage corresponding to the black image and the gray scale voltage corresponding to the image data comprise the same polarity.
Description
Technical field
The present invention relates to a kind of liquid crystal display driving method.
Background technology
Because advantages such as LCD has gently, approaches, power consumption is little are widely used on the state-of-the-art facilitys such as TV, notebook computer, mobile phone.
Seeing also Fig. 1, is a kind of electrical block diagram of prior art LCD.This LCD 10 comprise many sweep traces that are parallel to each other 13 (data line 14 that G1～Gn), many are parallel to each other and intersect vertically with these sweep trace 13 insulation (and D1～Dm), a plurality of word in the thin film transistor (TFT) of this sweep trace 13 and this data line 14 infalls (Thin Film Transistor, TFT) 15, a plurality of pixel electrode 16, scan driving circuit 11 and a data drive circuit 12.This scan drive circuit 11 is used to provide a plurality of scanning impulses to this sweep trace 13, and this data drive circuit 12 is used to provide a plurality of gray scale voltages to this data line 14.
The grid of this thin film transistor (TFT) 15 (not indicating) is connected to this sweep trace 13, and source electrode (not indicating) is connected to this data line 14, and drain electrode (not indicating) is connected to this pixel electrode 16.
This multi-strip scanning line 13 and these many data lines 14 infalls define a plurality of pixel regions (not indicating).These a plurality of pixel regions are arranged.Corresponding thin film transistor (TFT) 15 of each pixel region and the pixel electrode 16 that is connected.This multi-strip scanning line 13 is defined as a frame (frame) image by the image of whole interior demonstrations of pairing times of run-down successively.
Seeing also Fig. 2, is the sequential synoptic diagram of the scanning impulse of this LCD 10.The corresponding expression of VG1～VGn is applied to a plurality of scanning impulses of this multi-strip scanning line G 1～Gn.It is the high voltage pulse of T that these a plurality of scanning impulse VG1～VGn come down to a time length, when this high voltage pulse is applied to the grid of this thin film transistor (TFT) 15, and the source electrode of this thin film transistor (TFT) 15 and drain electrode conducting.The time span T of this pulse signal is defined as: a two field picture the sweep time/the scanning number of lines.Therefore, at any time, have only a sweep trace 13 to be scanned.
As shown in Figure 2, when scanning impulse VG1 is applied to this sweep trace G1, conducting between the source electrode of a plurality of thin film transistor (TFT)s 15 that this sweep trace G1 connects and the drain electrode.This data drive circuit 12 applies a plurality of pixel electrodes 16 of corresponding gray scale voltage to row via the thin film transistor (TFT) 15 of these a plurality of conductings.
When scanning impulse VG2 is applied to this sweep trace G2, conducting between the source electrode of a plurality of thin film transistor (TFT)s 15 that this sweep trace G2 connects and the drain electrode.This data drive circuit 12 applies a plurality of pixel electrodes 16 of corresponding gray scale voltage to row via the thin film transistor (TFT) 15 of these a plurality of conductings.
And the like, in the time, this scan drive circuit 12 provides these a plurality of scanning impulse VG1～VGn to this multi-strip scanning line G1～Gn successively at a two field picture.This data drive circuit 12 applies the gray scale voltage of row successively to corresponding pixel electrode 16.
Then, when back one two field picture shows, repeat the turntable driving process of former frame.In addition, the gray scale voltage that is applied to each pixel electrode 16 all will remain unchanged in this two field picture, and this data drive circuit 12 applies new gray scale voltage again when one two field picture of back.
When this LCD 10 showed dynamic images, because the persistence of vision phenomenon of human eye, during a two field picture, the former frame image still can persist in the vision of human eye after demonstration.At human eye, exist between the two continuous two field pictures to overlap.Can cause smear to produce like this, make that the visual effect of this LCD 10 is relatively poor.
Summary of the invention
In order to solve the relatively poor problem of LCD visual effect, be necessary to provide a kind of visual effect liquid crystal display driving method preferably.
A kind of liquid crystal display driving method, this LCD comprises the multi-strip scanning line, many data lines, this LCD can show corresponding image according to the view data of outside, this method is included in selected part of scanning line in this multi-strip scanning line; Provide a plurality of scanning impulses to this multi-strip scanning line successively, each scanning impulse is set at one first Scanning Section and one second Scanning Section; First Scanning Section at selected sweep trace provides the pixel region of the gray scale voltage of correspondence image data to this selected part of scanning line correspondence; Second Scanning Section at selected sweep trace provides the pixel region of the gray scale voltage of corresponding black image to this selected part of scanning line correspondence, and each pixel region is identical with the polarity of the gray scale voltage of the corresponding black image of second Scanning Section reception in the gray scale voltage of the correspondence image data of first Scanning Section reception; First and second Scanning Sections at not selected sweep trace provide the pixel region of the gray scale voltage of correspondence image data to this part of scanning line correspondence of not selecting.
A kind of liquid crystal display driving method, this LCD comprises the multi-strip scanning line, many data lines, this LCD can show corresponding image according to the view data of outside, this method comprises provides the one scan pulse to this sweep trace, and this scanning impulse comprises one first Scanning Section and one second Scanning Section; To first Scanning Section that should scanning impulse, the gray scale voltage that the correspondence image data are provided is to by the pixel region of the sweep trace correspondence that this scanning impulse scanned; Second Scanning Section to should scanning impulse provides the pixel region of the gray scale voltage of corresponding black image to this sweep trace correspondence, and the gray scale voltage that the gray scale voltage of this black image correspondence is corresponding with this view data has identical polar.
A kind of liquid crystal display driving method, this LCD comprises many sweep traces that are parallel to each other, many the data lines that are parallel to each other and intersect vertically with the insulation of this sweep trace, this LCD can show corresponding image according to the view data of outside, this method comprises provides a plurality of scanning impulses to this multi-strip scanning line successively, and each scanning impulse comprises one first Scanning Section and one second Scanning Section; First Scanning Section at each scanning impulse provides the gray scale voltage of correspondence image data to these many data lines; The gray scale voltage that corresponding black image is provided at second Scanning Section of this scanning impulse is to these many data lines, and the gray scale voltage gray scale voltage corresponding with this view data that is applied to same data line that is applied to this black image correspondence of each data line has identical polar.
Compared to prior art, above-mentioned liquid crystal display driving method is selected all or part sweep trace and is scanned the gray scale voltage of end prerequisite for corresponding black image at this sweep trace, thereby be equivalent between two two field pictures of front and back, insert black image, effectively overcome the influence that persistence of vision brings, make that the LCD visual effect of the above-mentioned liquid crystal display driving method of employing is good.
Description of drawings
Fig. 1 is a kind of electrical block diagram of prior art LCD.
Fig. 2 is the sequential synoptic diagram of the scanning impulse of LCD shown in Figure 1.
Fig. 3 is the synoptic diagram of liquid crystal display driving method first embodiment of the present invention.
Fig. 4 is the T-V curve synoptic diagram of the LCD of liquid crystal display driving method employing shown in Figure 3.
Embodiment
See also Fig. 3, it is the synoptic diagram of liquid crystal display driving method first embodiment of the present invention.This liquid crystal display driving method should be used for a LCD 20.This LCD 20 comprises scan driving circuit (figure does not show), a data drive circuit (figure does not show) and a display panels 21.This scan drive circuit is used to provide a plurality of scanning impulses to this display panels 21, and this data drive circuit is used for providing when this display panels 21 is scanned a plurality of gray scale voltages to this display panels 21.This display panels 21 is according to the corresponding image that shows different GTGs of these a plurality of gray scale voltages.A plurality of gray scale voltages that this data driving circuit provides are to be converted to according to the view data that the outside provides.
This display panels 21 comprises that one first substrate (figure does not show), second substrate (figure do not show) and relative with this first substrate are arranged on the liquid crystal layer (figure does not show) between this two substrate.This liquid crystal layer comprises a plurality of liquid crystal molecules.
This first substrate comprises that many sweep trace G1～Gn that are parallel to each other, many are parallel to each other and data line D1～Dm of intersecting vertically with this sweep trace line insulation, a plurality of thin film transistor (TFT) 25 that is arranged on this multi-strip scanning line G1～Gn and these many data line D1～Dm infalls and a plurality of pixel electrodes 26 corresponding with this a plurality of thin film transistor (TFT) 25.The grid of this thin film transistor (TFT) 25 is connected to this sweep trace G1～Gn, and source electrode is connected to this data line D1～Dm, and drain electrode is connected to this pixel electrode 26.The corresponding pixel region of the infall of each sweep trace G1～Gn and data line D1～Dm (not indicating), these a plurality of pixel regions are arranged.A corresponding pixel electrode 26 of each pixel region and a thin film transistor (TFT) 25.
This second substrate comprises a plurality of public electrodes 27.This pixel electrode 26 is oppositely arranged with this public electrode 27.Between this pixel electrode 26 and this public electrode 27 a plurality of liquid crystal molecules are set.These a plurality of public electrodes 27 are applied a common electric voltage Vcom by external circuit.
This multi-strip scanning line G1～Gn is defined as a frame (frame) image by the image that shows in the corresponding time of all scanning successively, and the time that each sweep trace is scanned equates, and is defined as sweep time.
This scan drive circuit applies a plurality of scanning impulse VG1～VGn to this multi-strip scanning line G1～Gn, makes the source electrode and drain electrode conducting of the thin film transistor (TFT) 25 that is connected with the sweep trace G1～Gn that is scanned.A plurality of gray scale voltages that this data drive circuit provided export this a plurality of pixel electrodes 26 to via the thin film transistor (TFT) 25 of this data line 24 and conducting, and form an electric field between this pixel electrode 26 and this public electrode 27.The liquid crystal molecule that is arranged in this electric field is under the electric field force effect and twist.Because the electric field of the corresponding different sizes of the gray scale voltage of different sizes, so the windup-degree of the gray scale voltage of the corresponding different sizes of liquid crystal molecule is also inequality.
In addition, liquid crystal molecule has a specific character, and promptly can not to be fixed on some voltage constant always.Not so of long duration, even voltage is canceled, liquid crystal molecule also can can't respond the variation of electric field again because characteristic is destroyed and reverse.Therefore, this display panels 21 adopts reversal of poles driving method to protect the characteristic of liquid crystal molecule not to be destroyed.
For each pixel region, if the gray scale voltage of its reception defines this pixel region and has positive polarity greater than common electric voltage Vcom, the gray scale voltage of this moment is the positive polarity gray scale voltage.Otherwise for each pixel region, if the gray scale voltage of its reception then defines this pixel region and has negative polarity less than common electric voltage Vcom, the gray scale voltage of this moment is the gray scale voltage of negative polarity.In addition, for each pixel region, no matter the gray scale voltage that it received is positive polarity gray scale voltage or negative polarity gray scale voltage, as long as the gray scale voltage that is received equates with the absolute value of the difference of common electric voltage Vcom, promptly the absolute value of the pixel voltage of this pixel region equates, this pixel region shows the image of same gray level.
In a plurality of pixel regions of this display panels 21, the polarity of the pixel region of each row is identical, and the pixel region polarity of adjacent column is opposite.Therefore, the pixel region of row along this data line D1～Dm be "+-+-+-... " rule arranges.This reversal of poles driving method is called row counter-rotating (line inversion) again and drives.
Seeing also Fig. 4, is the T-V curve synoptic diagram of this display panels 21.Wherein transverse axis is represented gray scale voltage, and unit is a volt (V), and the longitudinal axis is represented the penetrance of liquid crystal molecule, and unit is number percent (%), and Vcom represents common electric voltage.As shown in Figure 4, this display panels 21 is a normally white display panels, that is it is bigger to be applied to the difference of the gray scale voltage of this pixel electrode 26 and common electric voltage, and the penetrance of corresponding liquid crystal molecule is littler, and the shown image of corresponding pixel area is darker.Otherwise the gray scale voltage that is applied to this pixel electrode 26 is more near common electric voltage, and the penetrance of corresponding liquid crystal molecule is bigger, and the shown image of corresponding pixel area is brighter.When the absolute value of the difference of gray scale voltage that is applied to this pixel electrode 26 and common electric voltage during greater than a certain numerical value, the liquid crystal molecule of the pixel region of these pixel electrode 26 correspondences is light tight.When the liquid crystal molecule of the pixel region of these pixel electrode 26 correspondences is light tight (penetrance is zero), this pixel region shows black image, the gray scale voltage that definition is applied to this pixel electrode this moment is a black voltage, and other gray scale voltage of definition and view data correspondence is grey voltage.
As shown in Figure 3, VG1～VGn represents to be applied to the scanning impulse of this multi-strip scanning line G1～Gn respectively.VD is illustrated in the gray scale voltage that is applied to a data line in the two field picture.These a plurality of scanning impulse VG1～VGn are a plurality of high voltage pulses, and include one first Scanning Section and one second Scanning Section.This first Scanning Section and this second Scanning Section come down to this scanning impulse is divided into two and obtain.In the sweep time of each scanning impulse, in this first Scanning Section scanning corresponding scanning line, and in this this sweep trace of second Scanning Section continuation scanning.The time span of this first Scanning Section is more than or equal to the time span of this second Scanning Section.
In time, this data driving circuit applies a grey voltage and exports this grey voltage to this pixel electrode 26 at first Scanning Section of each scanning impulse.The pixel region of these pixel electrode 26 correspondences shows correspondence image.And at second Scanning Section of this scanning impulse in the time, this data driving circuit applies a black voltage and exports this black voltage to this pixel electrode 26, and this pixel region shows black image.This grey voltage that this pixel electrode 26 is received is identical with the polarity of black voltage.Usually, the process that black voltage is applied to the respective pixel zone is called black plug.
Specifically describe the course of work that this display panels 21 shows a two field picture below.This scanning impulse VG1 is applied to this sweep trace G1, and the grid of the thin film transistor (TFT) 25 of the row that this sweep trace G1 connects receives high-tension pulse, thus thin film transistor (TFT) 25 conductings of these row.In the time of first Scanning Section of this scanning impulse VG1, the grey voltage of correspondence image data is applied to corresponding pixel electrode 26 via the thin film transistor (TFT) 25 of this row conducting.In time, the black voltage of corresponding black image is applied to corresponding pixel electrode 26 via the thin film transistor (TFT) 25 of this row conducting at second Scanning Section of this scanning impulse VG1.The grey voltage of this black voltage and correspondence image is positive polarity.
When the high voltage pulse of this scanning impulse VG1 finishes, the high voltage pulse of this scanning impulse VG2 is applied to this sweep trace G2, the grid of the thin film transistor (TFT) 25 of the row that this sweep trace G2 connects receives high-tension pulse, thus thin film transistor (TFT) 25 conductings of these row.In time, the grey voltage of correspondence image data is applied to corresponding pixel electrode via the thin film transistor (TFT) of this row conducting at first Scanning Section of this scanning impulse VG2.In time, the black voltage of corresponding black image is applied to corresponding pixel electrode via the thin film transistor (TFT) 25 of this row conducting at second Scanning Section of this scanning impulse VG2.This black voltage and grey voltage are negative polarity.
Similarly, when the high voltage pulse of this scanning impulse VG2 finishes, the high voltage pulse of this scanning impulse VG3 is applied to this sweep trace G3, and the grid of the thin film transistor (TFT) 25 of the delegation that this sweep trace G3 connects receives high-tension pulse, thus 25 conductings of the thin film transistor (TFT) of this delegation.In the time of first Scanning Section of this scanning impulse VG3, the gray scale voltage of correspondence image data is applied to corresponding pixel electrode 26 via the thin film transistor (TFT) 25 of this row conducting.In time, the black voltage of corresponding black image is applied to corresponding pixel electrode 26 via the thin film transistor (TFT) 25 of this row conducting at second Scanning Section of this scanning impulse VG3.The grey voltage of this black voltage and correspondence image is positive polarity.
Thereafter, when the high voltage pulse of last scanning impulse finished, the high voltage pulse of back one scan pulse just was applied on the one scan line of back.When these a plurality of scanning impulse VG1～VGn were applied to this multi-strip scanning line G1～Gn successively, this display panels 21 was finished the turntable driving of a two field picture and is shown this two field picture.This display panels 21 repeats above-mentioned turntable driving process at each frame, thereby can show dynamic image.
In fact, this display panels 21 also can be taked other reversal of poles driving method, as frame inversion driving (frame inversion), some inversion driving (dot inversion), two-wire inversion driving (2-line inversion) or the like.Above-mentioned black voltage also is not limited to a certain fixed voltage value, makes the respective pixel zone show that the gray scale voltage of black image all is called black voltage in every case.
Liquid crystal display driving method second embodiment of the present invention is described below: this scan drive circuit provides a plurality of scanning impulse VG1～VGn to this multi-strip scanning line G1～Gn.Sweep trace (G1 when odd number, G3, G5, when G7...) being scanned, the course of work of this data driving circuit is identical in the liquid crystal display driving method of the course of work of this data driving circuit and first embodiment, first Scanning Section at high voltage pulse provides grey voltage, provides black voltage at second Scanning Section of high voltage pulse.Wherein, when the sweep trace of even number (G2, G4, G6, when G8...) being scanned, this data drive circuit provides the grey voltage of correspondence image data at first and second Scanning Sections of the high voltage pulse of the scanning impulse of correspondence.
Liquid crystal display driving method the 3rd embodiment of the present invention is described below: this scan drive circuit provides a plurality of scanning impulse VG1～VGn to this multi-strip scanning line G1～Gn.When the sweep trace of odd number (G1, G3, G5, when G7...) being scanned, this data drive circuit provides the grey voltage of correspondence image data at first and second Scanning Sections of the high voltage pulse of the scanning impulse of correspondence.Wherein, (G6 when G8...) being scanned, provides grey voltage at first Scanning Section of the high voltage pulse of the scanning impulse of correspondence for G2, G4, provides black voltage at second Scanning Section of high voltage pulse when the sweep trace of even number.This black voltage is identical with corresponding grey polarity of voltage.
Compared to prior art, liquid crystal display driving method first embodiment of the present invention is in scanning process, and each pixel region all is applied in the gray scale voltage of corresponding black image before the end of scan.Therefore the procedure for displaying that transforms to back one two field picture from last two field picture, be equivalent to insert many black images between two two field pictures of front and back, so at human eye, the overlapping between two two field pictures of front and back can be ignored for the influence that image shows.And black image also can improve image contrast of display degree to a certain extent.Liquid crystal display driving method second of the present invention and the 3rd embodiment all are part of scanning line of selected this multi-strip scanning line G1～Gn, when the sweep trace of this selected part is scanned, provide grey voltage and black voltage respectively at first and second Scanning Sections; And when not selected sweep trace is scanned, all provide grey voltage in this first and second Scanning Section.Therefore, also be equivalent to insert the part black image between two two field pictures of front and back, overcome the influence of persistence of vision to a certain extent, improved visual effect.
The present invention also can have other change embodiment.As, the time span of second Scanning Section of these a plurality of scanning impulses has nothing in common with each other, and the time span that only need satisfy second Scanning Section of each scanning impulse is not more than the time span of this first Scanning Section.
The former frame scanning process also can be identical with the selected sweep trace of back one frame scan process.As, can the former frame scanning process in to the sweep trace of odd number (G5 G7...) carries out black plug for G1, G3, then in the frame scan process sweep trace of dual numbers (G6 G8...) carries out black plug for G2, G4.
Claims (7)
1. liquid crystal display driving method, this LCD comprises the multi-strip scanning line, many data lines, this method comprises: selected part of scanning line in this multi-strip scanning line; Provide a plurality of scanning impulses to this multi-strip scanning line, each scanning impulse is set one first Scanning Section and one second Scanning Section; First Scanning Section in selected part of scanning line provides the pixel region of the gray scale voltage of correspondence image data to this selected part of scanning line correspondence; Second Scanning Section in the part of scanning line of selecting provides the pixel region of the gray scale voltage of corresponding black image to the part of scanning line correspondence that should select, and each pixel region is identical with the polarity of the gray scale voltage of the corresponding black image of second Scanning Section reception in the gray scale voltage of the correspondence image data of first Scanning Section reception; First and second Scanning Sections in not selected sweep trace provide the pixel region of the gray scale voltage of correspondence image data to this sweep trace correspondence of not selecting.
2. liquid crystal display driving method as claimed in claim 1 is characterized in that: the time span of first Scanning Section of this scanning impulse is greater than or equal to the time span of second Scanning Section of this scanning impulse.
3. liquid crystal display driving method as claimed in claim 1, it is characterized in that: scanning impulse is applied to the grid of a plurality of thin film transistor (TFT)s of the sweep trace correspondence that is scanned, make the source electrode and the drain electrode conducting of these a plurality of thin film transistor (TFT)s, these a plurality of gray scale voltages are applied to the pixel electrode of these a plurality of thin film transistor (TFT) correspondences respectively.
4. liquid crystal display driving method as claimed in claim 1 is characterized in that: selected part of scanning line is specially the odd-numbered scan lines of selected this multi-strip scanning line in this multi-strip scanning line.
5. liquid crystal display driving method as claimed in claim 1 is characterized in that: selected part of scanning line is specially the even-line interlace line of selected this multi-strip scanning line in this multi-strip scanning line.
6. liquid crystal display driving method, this LCD comprises the multi-strip scanning line, many data lines, this method comprises: provide the one scan pulse to this sweep trace, this scanning impulse comprises one first Scanning Section and one second Scanning Section; To first Scanning Section that should scanning impulse, the gray scale voltage that the correspondence image data are provided is to by the pixel region of the sweep trace correspondence that this scanning impulse scanned; Second Scanning Section to should scanning impulse provides the pixel region of the gray scale voltage of corresponding black image to this sweep trace correspondence, and the gray scale voltage that the gray scale voltage of this black image correspondence is corresponding with this view data has identical polar.
7. liquid crystal display driving method, this LCD comprises many sweep traces that are parallel to each other, many the data lines that are parallel to each other and intersect vertically with the insulation of this sweep trace, this method comprises: provide a plurality of scanning impulses to this multi-strip scanning line successively, each scanning impulse comprises one first Scanning Section and one second Scanning Section; First Scanning Section at each scanning impulse provides the gray scale voltage of correspondence image data to these many data lines; Second Scanning Section at this scanning impulse provides the gray scale voltage of corresponding black image to arrive these many data lines, and the gray scale voltage gray scale voltage corresponding with this view data that is applied to same data line that is applied to this black image correspondence of each data line has identical polar.
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| CN2008100672681A CN101581857B (en) | 2008-05-16 | 2008-05-16 | Method for driving liquid crystal display |
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