CN101013564A - Driving method of liquid crystal display - Google Patents
Driving method of liquid crystal display Download PDFInfo
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- CN101013564A CN101013564A CN 200710005515 CN200710005515A CN101013564A CN 101013564 A CN101013564 A CN 101013564A CN 200710005515 CN200710005515 CN 200710005515 CN 200710005515 A CN200710005515 A CN 200710005515A CN 101013564 A CN101013564 A CN 101013564A
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Abstract
The invention provides a method to driver LCD. The driver method is used to drive the pixel unit with the first and second pixels. The method includes the following steps: write a gray signal into a first pixel to form the first pixel electrode voltage, and write a gray signal into a second pixel to form the second pixel electrode voltage; when the scanning signal finishes scanning the scan lines in a specific area, it generates a second signal to the second common electrode to change the second pixel electrode voltage. The pixel unit in the invention includes two pixels, and each pixel has their own transistor, liquid crystal and storage capacitance capacitors, and makes two pixels with different pixel voltages. The two different pixel voltages can form different optical properties and compensate and average each other. It could ease the color pixel phenomenon in the single pixel unit.
Description
Technical field
The present invention is relevant with a kind of driving method, and is particularly relevant with the driving method of a LCD.
Background technology
LCD is used in various electronic products widely, for example in idea wrist-watch or the counter.For wide viewing angle is provided, company of Fujitsu (Fujitsu) proposed a kind of in 1997, pixel segmentation vertical orientation (Multi-Domain Vertical Alignment, MVA) technology.The MVA technology can obtain the visual angle of 160 degree, and, also can provide high to the outstanding performance of response fast when.Yet the MVA technology has a great shortcoming, promptly is skin color, especially the Asian's skin color to the people when when stravismus, can produce colour cast (color shift).
Fig. 1 represents that one uses the grayscale voltage and the graph of a relation of penetrance of the liquid crystal molecule of MVA technology, and wherein transverse axis is represented gray scale (gray) voltage of liquid crystal molecule, and unit is volt (V), and the longitudinal axis is represented penetrance.When human eye was faced this LCD, the relation curve of its transmissivity and voltage was that when the grayscale voltage that is applied increased, its transmissivity changed thereupon with solid line 101 expressions.Look side ways this LCD and work as human eye with an angle of inclination, the relation curve of its transmissivity and voltage is with dotted line 102 expressions, increase the also change thereupon of its transmissivity though apply voltage, but in zone 100, the variation of its transmissivity does not increase along with the increase that applies voltage, descend on the contrary, this is the main cause that causes colour cast.
Solution to the problems described above traditionally is the transmissivity when forming two groups of inferior pixels that can produce different transmissivities and grayscale voltage relation curve compensate stravismus in a pixel and the relation curve of grayscale voltage.Consult shown in Figure 2ly, dotted line wherein is the transmissivity and the relation curve of grayscale voltage originally, and thin solid line then is the transmissivity that produced of another time pixel in the same pixel and the relation curve of grayscale voltage.By mixing of dotted line 201 and fine line 202 optical characteristics between the two, can obtain to a more level and smooth transmissivity and the relation curve of grayscale voltage, shown in the heavy line among Fig. 2 203.
Therefore, how in a pixel, to produce pixel two times, and under same drive waveforms, can form different voltages, and become the target of pursuit.
Summary of the invention
Therefore, fundamental purpose of the present invention is to provide a kind of driving method, has the pixel cell of two independences time pixel with driving.
Twice pixel in the pixel cell another object of the present invention is to provide a kind of driving method, so that can form different pixel voltages respectively.
A further object of the present invention is to provide a kind of driving method, and with formation different optical characteristic in a pixel cell, and compensation is average mutually, and the colour cast in the pixel cell that eases up now looks like.
In view of above-mentioned purpose, the present invention proposes a kind of liquid crystal display driving method, in order to drive a pixel cell with twice pixel, each pixel cell comprises the first transistor and couples first storage capacitors of first common electrode, and transistor seconds and second storage capacitors that couples second common electrode, the method comprises: provide the one scan signal to sweep trace in regular turn, with conducting the first transistor and transistor seconds; Provide a grey scale signal to data line in regular turn, to see through the first transistor grey scale signal is write first storage capacitors and forms one first pixel electrode voltage, and grey scale signal is write this second storage capacitors and forms one second pixel electrode voltage through transistor seconds; And after having scanned the sweep trace that is positioned at a given zone when sweep signal, provide one first signal to first common electrode that is positioned at this given zone and provide a secondary signal to second common electrode that is positioned at this given zone, wherein first signal can change first pixel electrode voltage through first storage capacitors, and secondary signal can see through second storage capacitors change second pixel electrode voltage.
According to an embodiment, sweep signal of the present invention is a pulse signal.
According to an embodiment, first signal of the present invention and secondary signal are a second order signal, and wherein first signal is made up of one first voltage and one second voltage, secondary signal is made up of a tertiary voltage and one the 4th voltage, wherein first voltage is greater than second voltage, and the 4th voltage equals first voltage, and tertiary voltage equals second voltage.
According to an embodiment, first signal of the present invention and this secondary signal are one or three rank signals, and wherein first signal is made up of one first voltage, one second voltage and a tertiary voltage, secondary signal is made up of one the 4th voltage, one the 5th voltage and one the 6th voltage, wherein this second voltage is greater than first voltage, and first voltage is greater than tertiary voltage, and the 4th voltage equals first voltage, the 5th voltage equals tertiary voltage, and the 6th voltage equals second voltage.
According to an embodiment, first signal of the present invention is one or three rank signals, and this secondary signal is the certain voltage signal, and wherein this first signal is made up of one first voltage, one second voltage and a tertiary voltage, wherein second voltage is greater than first voltage, and first voltage is greater than tertiary voltage.
According to an embodiment, first signal of the present invention is selected from certain voltage signal, a square-wave signal, a second order signal and one or three rank signals and forms in the group one of them.
Pixel cell of the present invention comprises pixel twice, and all has separately transistor, liquid crystal capacitance and storage capacitors in pixel each time.Utilize a voltage modulated waveform can change the pixel electrode voltage that presents the contained voltage data of data line originally, so that twice pixel has different pixel voltages.These two kinds of different pixel voltages can form the different optical characteristic, and compensation is average mutually, the color offset phenomenon in the pixel cell that therefore can ease up.
Description of drawings
Fig. 1 and Fig. 2 represent the driving voltage of liquid crystal molecule and the graph of a relation of penetrance.
Fig. 3 A is depicted as the summary icon of a liquid crystal panel.
Fig. 3 B is depicted as the top view according to the LCD framework of the embodiment of the invention.
Fig. 3 C is depicted as the amplification icon of a pixel cell.
Fig. 4 A is depicted as according to first embodiment of the invention in order to drive the drive waveforms of a liquid crystal panel common electrode.
Fig. 4 B is depicted as the drive waveforms that is positioned at zone 1 each pixel cell according to first embodiment of the invention in order to driving.
Fig. 5 A is depicted as according to second embodiment of the invention in order to drive the drive waveforms of a liquid crystal panel common electrode.
Then the drive waveforms that is positioned at zone 1 each pixel cell according to second embodiment of the invention in order to driving shown in Fig. 5 B.
Fig. 6 A is depicted as according to third embodiment of the invention in order to drive the drive waveforms of a liquid crystal panel common electrode.
Fig. 6 B is depicted as the drive waveforms that is positioned at zone 1 each pixel cell according to third embodiment of the invention in order to driving.
Fig. 7 A is depicted as according to fourth embodiment of the invention in order to drive the drive waveforms of a liquid crystal panel common electrode.
Fig. 7 B is depicted as the drive waveforms that is positioned at zone 1 each pixel cell according to fourth embodiment of the invention in order to driving.
Figure 8 shows that one uses the summary icon of dual-drive technology liquid crystal panel.
Fig. 9 A to Fig. 9 E is depicted as driving voltage waveform of the present invention.
The primary clustering symbol description:
100: the zone
101: solid line
102,201: dotted line
202: fine line
203: heavy line
501,801,802: the data line drive integrated circult
502: the scanning line driving integrated circuit
301: pixel
3011,3012: inferior pixel
3013,3014,3015,3016,3017,3018: voltage
5013,5014,5015,5016,5017,5018: voltage
6013,6014,6015,6016,6017,6018: voltage
7013,7014,7015,7016,7017,7018,7019,7020: voltage
D
1, D
2, D
3D
n: data line
G
1, G
2, G
3G
n: sweep trace
V
Com(A), V
Com(B): common electrode
Embodiment
For above and other objects of the present invention, feature and advantage can be become apparent, conjunction with figs. is illustrated as follows:
The present invention by form twice pixel in a unit picture element, utilizes all common electrode driving voltages of each time pixel to modulate time pixel voltage for solving colour cast picture now simultaneously, makes to have two different inferior pixel voltages in the unit picture element.In addition, please refer to the summary icon that Fig. 3 A is depicted as a liquid crystal panel.The present invention modulates the pixel voltage of each time pixel except utilizing common electrode, and also each sweep trace with a liquid crystal panel carries out subregion, for example, is divided into n zone, and with to the common electrode in the different scanning line interval, timesharing provides driving voltage.In other words, each pixel that is positioned at same area utilizes common electrode voltage to drive at identical time point, and its common electrode driving voltage of each pixel that is positioned at zones of different has the mistiming to each other.
Consult Fig. 3 B and be depicted as top view according to the LCD framework of the embodiment of the invention, the framework of viewing area 1 only in this icon, the framework icon that all the other are regional can the rest may be inferred.LCD of the present invention is by data line D
1, D
2, D
3D
n, sweep trace G
1, G
2, G
3G
nAnd many common electrodes are formed jointly.Wherein data line and sweep trace square crossing in fact each other, sweep trace is arranged in parallel with electrode is then interlaced with each other jointly.In addition, a data line drive integrated circult 501 control data line D
1, D
2, D
3D
n, one scan line drive integrated circult 502 gated sweep line G
1, G
2, G
3G
mIf hypothesis m bar sweep trace becomes a zone, then zone 1 comprises G
1, G
2, G
3And G4 ... sweep trace.Though have only 4 Gate of expression among Fig. 3 B, do not represent and have only 4 Gate.According to the present invention, a unit picture element more is separated into pixel twice, carries out the pixel voltage modulation by separately common electrode respectively, to present different pixel voltages, solves the color offset phenomenon in the pixel.
See also shown in Fig. 3 C, be the amplification icon of pixel 301.Pixel 301 is by data line D
1And sweep trace G
1Define jointly, and be parallel to two common electrode V of sweep trace
Com(A) and V
Com(B) be arranged in sweep trace G
1Both sides.Pixel 301 is separated into pixel twice, and wherein time pixel 3011 is positioned at sweep trace G
1With common electrode V
Com(A) between, inferior pixel 3012 then is positioned at sweep trace G
1With common electrode V
Com(B) between.Inferior pixel 3011 comprises transistor Q
1, its grid is coupled to sweep trace G
1, and transistor Q
1First source/drain electrode be coupled to data line D
1, second source/drain electrode then is coupled to pixel electrode V
PaPixel electrode V wherein
PaWith common electrode V
Com(A) form storage capacitors C
Stl, pixel electrode V
PaForm liquid crystal capacitance C with the upper substrate conductive electrode
Lc1Also comprise a transistor Q in the inferior pixel 3012
2, its grid is coupled to sweep trace G
1, first source/drain electrode is coupled to data line D
1, and second source/drain electrode is connected in pixel electrode V
Pb, pixel electrode V
PbForm storage capacitors C with common electrode Vcom (B) structure
St2, pixel electrode V
PbForm liquid crystal capacitance C with the upper substrate conductive electrode
Lc2
Transistor Q wherein
1And Q
2Can be used as switch, control time pixel 3011 and 3012 respectively, when scan voltage puts on sweep trace G
1The time, transistor Q
1And Q
2Be opened, at this moment data line D
1Going up contained data voltage can be respectively via transistor Q
1And Q
2Be sent to pixel electrode V
PaWith pixel electrode V
Pb, and be applied to and pixel electrode V
PaWith pixel electrode V
PbThe storage capacitors C that joins
St1With storage capacitors C
St2, and liquid crystal capacitance C
Lc1With liquid crystal capacitance C
Lc2On.In other words, the pixel electrode V in time pixel 3011 this moment
Pa, and the pixel electrode V in the inferior pixel 3012
PbAll be to present data line D
1Go up contained data voltage.The present invention has different pixel voltages respectively in order to make twice pixel region, to reduce colour cast picture now, therefore, applies different driving voltages on common electrode Vcom (A) and Vcom (B), utilizes storage capacitors C
St1With storage capacitors C
St2Coupling effect, modulated pixels electrode V
PaWith pixel electrode V
PbMake pixel electrode V
PaWith pixel electrode V
PbHas different display voltage.Below will embodiments of the present invention be described in detail in detail with several embodiment.
Consulting Fig. 4 A is depicted as according to first embodiment of the invention in order to drive the driving voltage waveform of a liquid crystal panel common electrode.The scanning line driving voltage waveform of wherein being painted is meant from the 1st sweep trace and is urged to the last item sweep trace in regular turn.Hypothesis each sweep trace that will form a liquid crystal panel is divided into three districts in the present embodiment in addition, zone 1, zone 2 and regional 3, but the present invention is not limited in and is distinguished into three zones.Therefore at a picture frame in the time, the driving voltage waveform that puts on common electrode Vcom (A) and the Vcom (B) also is divided into three time zones, and timesharing exports, three zones that drive on the liquid crystal panel respectively to be separated out.Each picture frame time, also promptly scan the time cycle of each sweep trace of liquid crystal panel, be divided into three time section T 1, T2 and T3, wherein time section T 1 is arranged in the sweep trace time in zone 1, time section T 2 is arranged in zone 2 for scanning 3 sweep trace times that are arranged in zone 3 for scanning of sweep trace time, time section T for scanning.
For zone 1, in time section T 1, the sweep trace in zone 1 is driven by sweep signal respectively, and the driving voltage on common electrode Vcom (A) and the Vcom (B) is a reference voltage, so the pixel electrode V in each pixel cell
PaWith pixel electrode V
PbThe voltage that can present on the data line in regular turn to be transmitted makes pixel electrode V in each pixel cell
PaWith pixel electrode V
PbPresent identical display voltage.And in time section T 2, because the sweep trace in zone 1 is not driven by sweep signal, and the driving voltage waveform on common electrode Vcom (A) and the Vcom (B) can switch to modulation voltage, therefore pixel electrode V in each pixel cell in the zone 1
PaWith pixel electrode V
PbCan have different display voltage.And in time section T 3, because zone 1 sweep trace is not driven by sweep signal, and modulation voltage position standard (level) on common electrode Vcom (A) and the Vcom (B) remains unchanged, so pixel electrode V in each pixel cell in regional 1
PaWith pixel electrode V
PbVoltage shown in shown voltage and the time section T 2 is consistent.
For zone 2, in time section T 1, because zone 2 sweep trace is not driven by sweep signal, so the show state of each pixel cell when remaining on a picture frame, i.e. pixel electrode V
PaWith pixel electrode V
PbHas different display voltage.And in time section T 2, zone 2 sweep trace is driven by sweep signal, and the driving voltage waveform on common electrode Vcom (A) and the Vcom (B) remains on reference voltage, at this moment the pixel electrode V in each pixel cell
PaWith pixel electrode V
PbCan present the voltage that is transmitted on the data line D in regular turn, make pixel electrode V in each pixel cell
PaWith pixel electrode V
PbPresent identical display voltage.And in time section T 3, because the sweep trace in zone 2 is not driven by sweep signal, and the driving voltage waveform on common electrode Vcom (A) and the Vcom (B) can switch to modulation voltage, so pixel electrode V in each pixel cell
PaWith pixel electrode V
PbHas different display voltage.
Zone 3, in time section T 1, because zone 3 sweep trace is not driven by sweep signal, so the show state of each pixel cell when remaining on a picture frame, i.e. pixel electrode V in each pixel cell
PaWith pixel electrode V
PbHas different display voltage.And in time section T 2, zone 3 sweep trace is not driven by sweep signal, and the modulation voltage position on common electrode Vcom (A) and the Vcom (B) certainly hold constant, so pixel electrode V in each pixel cell
PaWith pixel electrode V
PbRemain on voltage shown in the time section T 1.And in time section T 3, zone 3 sweep trace is driven by sweep signal, and the driving voltage waveform on common electrode Vcom (A) and the Vcom (B) remains on reference voltage, at this moment the pixel electrode V in each pixel cell
PaWith pixel electrode V
PbCan present the voltage that is transmitted on the data line D in regular turn, make pixel electrode V in each pixel cell
PaWith pixel electrode V
PbPresent identical display voltage.In other words, according to the present invention, each pixel cell in the time, has for 2/3 picture frame time at a picture frame at least, its pixel electrode V
PaWith pixel electrode V
PbHas different display voltage.
Consult shown in Fig. 4 B then for be positioned at the drive waveforms of zone 1 each pixel cell in order to driving according to first embodiment of the invention.Regional drive waveforms can the rest may be inferred for other.The drive waveforms of sweep trace is an impulse form, and drives each sweep trace with the way of output in proper order.In addition, the drive waveforms of common electrode Vcom (A) and Vcom (B) adopts two stepwise driving methods in the present embodiment, and it is 5V in order to the former benchmark voltage quasi position that drives time pixel 3011 common electrode Vcom (A), and the accurate position of modulation voltage is 4V.And being 4V in order to the accurate position of the primary voltage that drives time pixel 3012 common electrode Vcom (B), the accurate position of modulation voltage is 5V.
Please consult Fig. 3 C and Fig. 4 B simultaneously.When the period T 1 of picture frame K, zone each sweep trace in 1 is scanned by sweep signal in regular turn, this moment in pixel cell 301, sweep trace G
1Be the high levels state, so transistor Q
1And Q
2To be switched on.This moment data line D
1On the voltage signal that transmitted, can be respectively via transistor Q
1And Q
2To storage capacitors C
St1With storage capacitors C
St2And liquid crystal capacitance C
Lc1With liquid crystal capacitance C
Lc2Charge the pixel electrode V in the feasible time pixel 3011 and 3012
PaWith pixel electrode V
PbAll present data line D
1On the voltage 3013 that transmitted.
When period T 2, zone each sweep trace in 1 is finished by sweep signal scanning all, this moment in pixel cell 301, sweep trace G
1Present the low level state, so transistor Q
1And Q
2To be closed, so pixel electrode V
PaWith pixel electrode V
PbTo maintain data line D
1On the voltage 3013 that transmitted.But can become 4V by the 5V modulation in order to the voltage quasi position that drives time pixel 3011 common electrode Vcom (A) in the time of therefore, the change in voltage on this common electrode Vcom (A) can see through storage capacitors C
St1Coupling effect influence pixel electrode V
PaOn voltage, make pixel electrode V
PaOn voltage drop to voltage 3014 by voltage 3013.And also becoming 5V by the 4V modulation in order to the voltage quasi position that drives time pixel 3012 common electrode Vcom (B), the change in voltage on this common electrode Vcom (B) can see through storage capacitors C
St2Coupling effect influence pixel electrode V
PbOn voltage, make pixel electrode V
PbOn voltage rise to voltage 3015 by voltage 3013.And the pixel electrode V in feasible time pixel 3011 and time pixel 3012
PaAnd V
PbPresent different pixel voltages respectively.
When period T 3, zone each sweep trace in 1 is finished by sweep signal scanning all, this moment in pixel cell 301, sweep trace G
1Present the low level state, so transistor Q
1And Q
2To be closed, so pixel electrode V
PaWith pixel electrode V
PbVoltage status in the time of will maintaining period T 2.
Then carry out the scanning of adjacent frames K+1, this moment, sweep signal can scan from article one sweep trace again in regular turn, and when the period T 4 of picture frame K+1, zone each sweep trace in 1 is scanned by sweep signal in regular turn, this moment in pixel cell 301, sweep trace G
1Be the high levels state, and the voltage quasi position of common electrode Vcom (A) and common electrode Vcom (B) all maintains the accurate position of reference voltage.This moment transistor Q
1And Q
2To be switched on.Data line D
1On the voltage signal that transmitted, can be respectively via transistor Q
1And Q
2To storage capacitors C
St1With storage capacitors C
St2, and liquid crystal capacitance C
Lc1Liquid crystal capacitance C
Lc2Charge, because the voltage signal that is transmitted on the adjacent two drawing frame data lines can be anti-phase, the pixel electrode V in the therefore feasible time pixel 3011 and 3012
PaWith pixel electrode V
PbAll present data line D
1On the voltage 3016 that transmitted.
When period T 5, zone each sweep trace in 1 is finished by sweep signal scanning all, this moment in pixel cell 301, sweep trace G
1Present the low level state, so transistor Q
1And Q
2To be closed, so pixel electrode V
PaWith pixel electrode V
PbTo maintain data line D
1On the voltage 3016 that transmitted.But can become 4V by the 5V modulation in order to the voltage quasi position that drives time pixel 3011 common electrode Vcom (A) in the time of therefore, the change in voltage on this common electrode Vcom (A) can see through storage capacitors C
St1Coupling effect influence pixel electrode V
PaOn voltage, make pixel electrode V
PaOn voltage drop to voltage 3017 by voltage 3016.And also becoming 5V by the 4V modulation in order to the voltage quasi position that drives time pixel 3012 common electrode Vcom (B), the change in voltage on this common electrode Vcom (B) can see through storage capacitors C
St2Coupling effect influence pixel electrode V
PbOn voltage, make pixel electrode V
PbOn voltage rise to voltage 3018 by voltage 3016.And make the pixel electrode V in inferior pixel 3011 and time pixel 3012
PaAnd V
PbPresent different pixel voltages respectively.
When period T 6, zone each sweep trace in 1 is finished by sweep signal scanning all, this moment in pixel cell 301, sweep trace G
1Present the low level state, so transistor Q
1And Q
2To be closed, so pixel electrode V
PaWith pixel electrode V
PbVoltage status in the time of will maintaining period T 5.
Consulting Fig. 5 A is depicted as according to second embodiment of the invention in order to drive the drive waveforms of a liquid crystal panel common electrode.The scanning line driving waveform of wherein being painted is meant from the 1st sweep trace and is urged to the last item sweep trace in regular turn.In addition in the present embodiment also hypothesis each sweep trace that will form a liquid crystal panel be divided into three districts, be respectively zone 1, zone 2 and regional 3, but the present invention is not limited in and is distinguished into three zones.And each picture frame time, also be divided into three time section T 1, T2 and T3, wherein time section T 1 is arranged in the sweep trace time in zone 1, time section T 2 is arranged in zone 2 for scanning 3 sweep trace times that are arranged in zone 3 for scanning of sweep trace time, time section T for scanning.Present embodiment and the first embodiment maximum different be in, driving voltage waveform on common electrode Vcom (A) and the Vcom (B), for same driving time zone, the reference voltage that the modulation voltage that a last picture frame drives drives as next picture frame, and the modulation voltage that the reference voltage that a last picture frame drives drives as next picture frame, by two different voltage levels, make pixel electrode V among Fig. 3 C
PaWith pixel electrode V
PbHas different display voltage.
For zone 1, in time section T 1, because the sweep trace in zone 1 is driven by sweep signal, so pixel electrode V in each pixel cell
PaWith pixel electrode V
PbThe voltage that can present on the data line in regular turn to be transmitted makes pixel electrode V in each pixel cell
PaWith pixel electrode V
PbPresent identical display voltage.And in time section T 2, because the sweep trace in zone 1 is not driven by sweep signal, and the driving voltage waveform on common electrode Vcom (A) and the Vcom (B) can be switched, so pixel electrode V in each pixel cell
PaWith pixel electrode V
PbHas different display voltage.And in time section T 3 because zone 1 sweep trace is not driven by sweep signal, and the modulation voltage position on common electrode Vcom (A) and the Vcom (B) certainly hold constant, so pixel electrode V in each pixel cell
PaWith pixel electrode V
PbRemain on voltage shown in the time section T 2.
For zone 2, in time section T 1, because the sweep trace in zone 2 is not driven by sweep signal, so pixel electrode V in each pixel cell
PaWith pixel electrode V
PbHas different display voltage.And in time section T 2, zone 2 sweep trace is driven by sweep signal, and the driving voltage waveform on common electrode Vcom (A) and the Vcom (B) remains on reference voltage, at this moment the pixel electrode V in each pixel cell
PaWith pixel electrode V
PbCan present the voltage that is transmitted on the data line D in regular turn, make pixel electrode V in each pixel cell
PaWith pixel electrode V
PbPresent identical display voltage.And in time section T 3, because the sweep trace in zone 2 is not driven by sweep signal, and the driving voltage waveform on common electrode Vcom (A) and the Vcom (B) can be switched, so pixel electrode V in each pixel cell
PaWith pixel electrode V
PbHas different display voltage.
Zone 3, in time section T 1, because the sweep trace in zone 3 is not driven by sweep signal, so pixel electrode V in each pixel cell
PaWith pixel electrode V
PbHas different display voltage.And in time section T 2, zone 3 sweep trace is not driven by sweep signal, and the driving voltage waveform on common electrode Vcom (A) and the Vcom (B) remains unchanged, so pixel electrode V in each pixel cell
PaWith pixel electrode V
PbRemain on voltage shown in the time section T 1.And in time section T 3, zone 3 sweep trace is driven by sweep signal, and the driving voltage waveform on common electrode Vcom (A) and the Vcom (B) remains on reference voltage, at this moment the pixel electrode V in each pixel cell
PaWith pixel electrode V
PbCan present the voltage that is transmitted on the data line D in regular turn, make pixel electrode V in each pixel cell
PaWith pixel electrode V
PbPresent identical display voltage.In other words, according to the present invention, each pixel cell in the time, has for 2/3 picture frame time at a picture frame at least, its pixel electrode V
PaWith pixel electrode V
PbHas different display voltage.
Consult shown in Fig. 5 B then for be positioned at the drive waveforms of zone 1 each pixel cell in order to driving according to second embodiment of the invention.Regional drive waveforms can the rest may be inferred for other.The drive waveforms of sweep trace is an impulse form, and drives each sweep trace with the way of output in proper order.In addition, the drive waveforms of common electrode Vcom (A) and Vcom (B) adopts two stepwise driving methods in the present embodiment, the conversion between 5V and 4V of the voltage quasi position of its driving voltage waveform.
Please consult Fig. 3 C and Fig. 5 B simultaneously.When the period T 1 of picture frame K, zone each sweep trace in 1 is scanned by sweep signal in regular turn, this moment in pixel cell 301, sweep trace G
1Be the high levels state, so transistor Q
1And Q
2To be switched on.This moment data line D
1On the voltage signal that transmitted, can be respectively via transistor Q
1And Q
2To storage capacitors C
St1With storage capacitors C
St2, and liquid crystal capacitance C
Lc1With liquid crystal capacitance C
Lc2Charge the pixel electrode V in the feasible time pixel 3011 and 3012
PaWith pixel electrode V
PbAll present data line D
1On the voltage 3013 that transmitted.
When period T 2, zone each sweep trace in 1 is finished by sweep signal scanning all, this moment in pixel cell 301, sweep trace G
1Present the low level state, so transistor Q
1And Q
2To be closed, so pixel electrode V
PaWith pixel electrode V
PbTo maintain data line D
1On the voltage 5013 that transmitted.But can become 4V by the 5V modulation in order to the voltage quasi position that drives time pixel 3011 common electrode Vcom (A) in the time of therefore, the change in voltage on this common electrode Vcom (A) can see through storage capacitors C
St1Coupling effect influence pixel electrode V
PaOn voltage, make pixel electrode V
PaOn voltage drop to voltage 5014 by voltage 5013.And also becoming 5V by the 4V modulation in order to the voltage quasi position that drives time pixel 3012 common electrode Vcom (B), the change in voltage on this common electrode Vcom (B) can see through storage capacitors C
St2Coupling effect influence pixel electrode V
PbOn voltage, make pixel electrode V
PbOn voltage rise to voltage 5015 by voltage 5013.And make the pixel electrode V in inferior pixel 3011 and time pixel 3012
PaAnd V
PbPresent different pixel voltages respectively.
When period T 3, zone each sweep trace in 1 is finished by sweep signal scanning all, this moment in pixel cell 301, sweep trace G
1Present the low level state, so transistor Q
1And Q
2To be closed, so pixel electrode V
PaWith pixel electrode V
PbVoltage status in the time of will maintaining period T 2.
Then carry out the scanning of adjacent frames K+1, this moment, sweep signal can scan from article one sweep trace again in regular turn, and when the period T 4 of picture frame K+1, zone each sweep trace in 1 is scanned by sweep signal in regular turn, this moment in pixel cell 301, sweep trace G
1Be the high levels state, and the voltage quasi position of common electrode Vcom (A) and common electrode Vcom (B) all maintains the accurate position of primary voltage.This moment transistor Q
1And Q
2To be switched on.Data line D
1On the voltage signal that transmitted, can be respectively via transistor Q
1And Q
2To storage capacitors C
St1With storage capacitors C
St2, and liquid crystal capacitance C
Lc1With liquid crystal capacitance C
Lc2Charge, because the voltage signal that is transmitted on the adjacent two drawing frame data lines can be anti-phase, the pixel electrode V in the therefore feasible time pixel 3011 and 3012
PaWith pixel electrode V
PbAll present data line D
1On the voltage 5016 that transmitted.
When period T 5, zone each sweep trace in 1 is finished by sweep signal scanning all, this moment in pixel cell 301, sweep trace G
1Present the low level state, so transistor Q
1And Q
2To be closed, so pixel electrode V
PaWith pixel electrode V
PbTo maintain data line D
1On the voltage 5016 that transmitted.But can become 5V by the 4V modulation in order to the voltage quasi position that drives time pixel 3011 common electrode Vcom (A) in the time of therefore, the change in voltage on this common electrode Vcom (A) can see through storage capacitors C
St1Coupling effect influence pixel electrode V
PaOn voltage, make pixel electrode V
PaOn voltage rise to voltage 5017 by voltage 5016.And also becoming 4V by the 5V modulation in order to the voltage quasi position that drives time pixel 3012 common electrode Vcom (B), the change in voltage on this common electrode Vcom (B) can see through storage capacitors C
St2Coupling effect influence pixel electrode V
PbOn voltage, make pixel electrode V
PbOn voltage drop to voltage 5018 by voltage 5016.And make the pixel electrode V in inferior pixel 3011 and time pixel 3012
PaAnd V
PbPresent different pixel voltages respectively.
When period T 6, zone each sweep trace in 1 is finished by sweep signal scanning all, this moment in pixel cell 301, sweep trace G
1Present the low level state, so transistor Q
1And Q
2To be closed, so pixel electrode V
PaWith pixel electrode V
PbVoltage status in the time of will maintaining period T 5.Therefore, each pixel cell of the present invention all has for 2/3 picture frame time at least at a picture frame in the time, its pixel electrode V
PaWith pixel electrode V
PbHas different display voltage.And same pixel electrode has identical variation situation between adjacent two picture frames.
Consulting Fig. 6 A is depicted as according to third embodiment of the invention in order to drive the drive waveforms of a liquid crystal panel common electrode.The scanning line driving waveform of wherein being painted means from the 1st sweep trace and is urged to the last item sweep trace in regular turn.In addition in the present embodiment also hypothesis each sweep trace that will form a liquid crystal panel be divided into three districts, be respectively zone 1, zone 2 and regional 3, but the present invention is not limited in and is distinguished into three zones.And each picture frame time, also be divided into three time section T 1, T2 and T3, wherein time section T 1 is arranged in the sweep trace time in zone 1, time section T 2 is arranged in zone 2 for scanning 3 sweep trace times that are arranged in zone 3 for scanning of sweep trace time, time section T for scanning.Present embodiment and the first and second embodiment maximums different be in, the drive waveforms of common electrode is the three-stage type drive waveforms, is respectively 4 volts, 5 volts and 7 volts.And the driving voltage waveform on common electrode Vcom (A) and the Vcom (B), reference voltage can be switched back in same time zone in advance before next picture frame time drives, and, be to use the not modulation voltage of coordination standard in adjacent two picture frames, so that the pixel electrode V among Fig. 3 C for for community electrode
PaWith pixel electrode V
PbHas different display voltage.
For zone 1, in time section T 1, the sweep trace in zone 1 is driven by sweep signal, and the driving voltage on common electrode Vcom (A) and the Vcom (B) is a reference voltage, so pixel electrode V in each pixel cell
PaWith pixel electrode V
PbThe voltage that can present on the data line in regular turn to be transmitted makes pixel electrode V in each pixel cell
PaWith pixel electrode V
PbPresent identical display voltage.And in time section T 2, because the sweep trace in zone 1 is not driven by sweep signal, and the driving voltage waveform on common electrode Vcom (A) and the Vcom (B) can switch to modulation voltage, so pixel electrode V in each pixel cell
PaWith pixel electrode V
PbHas different display voltage.And in time section T 3, because zone 1 sweep trace is not driven by sweep signal, and the driving voltage waveform on common electrode Vcom (A) and the Vcom (B) remains unchanged, so pixel electrode V in each pixel cell
PaWith pixel electrode V
PbRemain on voltage shown in the time section T 2.
For zone 2, in time section T 1, because zone 2 sweep trace is not driven by sweep signal, so the show state of each pixel cell when remaining on a picture frame, i.e. pixel electrode V
PaWith pixel electrode V
PbHas different display voltage.And in time section T 2, zone 2 sweep trace is driven by sweep signal, and the driving voltage on common electrode Vcom (A) and the Vcom (B) reverts back to reference voltage, at this moment the pixel electrode V in each pixel cell
PaWith pixel electrode V
PbCan present the voltage that is transmitted on the data line D in regular turn, make pixel electrode V in each pixel cell
PaWith pixel electrode V
PbPresent identical display voltage.And in time section T 3, because the sweep trace in zone 2 is not driven by sweep signal, and the driving voltage waveform on common electrode Vcom (A) and the Vcom (B) can be switched, so pixel electrode V in each pixel cell
PaWith pixel electrode V
PbHas different display voltage.
Zone 3, in time section T 1, because zone 3 sweep trace is not driven by sweep signal, so the show state of each pixel cell when remaining on a picture frame, i.e. pixel electrode V in each pixel cell
PaWith pixel electrode V
PbHas different display voltage.And in time section T 2, zone 3 sweep trace is not driven by sweep signal, and the driving voltage waveform on common electrode Vcom (A) and the Vcom (B) remains unchanged, so pixel electrode V in each pixel cell
PaWith pixel electrode V
PbRemain on voltage shown in the time section T 1.And in time section T 3, zone 3 sweep trace is driven by sweep signal, and the driving voltage waveform on common electrode Vcom (A) and the Vcom (B) reverts back to reference voltage, at this moment the pixel electrode V in each pixel cell
PaWith pixel electrode V
PbCan present the voltage that is transmitted on the data line D in regular turn, make pixel electrode V in each pixel cell
PaWith pixel electrode V
PbPresent identical display voltage.In other words, according to the present invention, each pixel cell in the time, has for 2/3 picture frame time at a picture frame at least, its pixel electrode V
PaWith pixel electrode V
PbHas different display voltage.
Consult shown in Fig. 6 B, then for be positioned at the drive waveforms of zone 1 each pixel cell with driving according to third embodiment of the invention week.Regional drive waveforms can the rest may be inferred for other.The drive waveforms of sweep trace is an impulse form, and drives each sweep trace with the way of output in proper order.In addition, the drive waveforms of common electrode Vcom (A) and Vcom (B) system adopts three-stage type driving method, the conversion between 4V, 5V and 7V of the voltage quasi position of its driving voltage waveform in the present embodiment.
Please consult Fig. 3 C and Fig. 6 B simultaneously.When the period T 1 of picture frame K, zone each sweep trace in 1 is scanned by sweep signal in regular turn, this moment in pixel cell 301, sweep trace G
1Be the high levels state, so transistor Q
1And Q
2To be switched on.This moment data line D
1On the voltage signal that transmitted, can be respectively via transistor Q
1And Q
2To storage capacitors C
St1With storage capacitors C
St2, and liquid crystal capacitance C
Lc1With liquid crystal capacitance C
Lc2Charge the pixel electrode V in the feasible time pixel 3011 and 3012
PaWith pixel electrode V
PbAll present data line D
1On the voltage 3013 that transmitted.
When period T 2, zone each sweep trace in 1 is finished by sweep signal scanning all, this moment in pixel cell 301, sweep trace G
1Present the low level state, so transistor Q
1And Q
2To be closed, so pixel electrode V
PaWith pixel electrode V
PbTo maintain data line D
1On the voltage 6013 that transmitted.But can become 7V by the 5V modulation in order to the voltage quasi position that drives time pixel 3011 common electrode Vcom (A) in the time of therefore, the change in voltage on this common electrode Vcom (A) can see through storage capacitors C
St1Coupling effect influence pixel electrode V
PaOn voltage, make pixel electrode V
PaOn voltage rise to voltage 6014 by voltage 6013.And also becoming 4V by the 5V modulation in order to the voltage quasi position that drives time pixel 3012 common electrode Vcom (B), the change in voltage on this common electrode Vcom (B) can see through storage capacitors C
St2Coupling effect influence pixel electrode V
PbOn voltage, make pixel electrode V
PbOn voltage drop to voltage 6015 by voltage 6013.And make the pixel electrode V in inferior pixel 3011 and time pixel 3012
PaAnd V
PbPresent different pixel voltages respectively.
When period T 3, zone each sweep trace in 1 is finished by sweep signal scanning all, this moment in pixel cell 301, sweep trace G
1Present the low level state, so transistor Q
1And Q
2Be closed, so pixel electrode V
PaWith pixel electrode V
PbVoltage status in the time of will maintaining period T 2.
Then carry out the scanning of adjacent frames K+1, this moment, sweep signal can scan from article one sweep trace again in regular turn, and when the period T 4 of picture frame K+1, zone each sweep trace in 1 is scanned by sweep signal in regular turn, this moment in pixel cell 301, sweep trace G
1Be the high levels state, and the voltage quasi position of common electrode Vcom (A) and common electrode Vcom (B) all reverts to the accurate position of reference voltage 5V.This moment transistor Q
1And Q
2To be switched on.Data line D
1On the voltage signal that transmitted, can be respectively via transistor Q
1And Q
2To storage capacitors C
St1With storage capacitors C
St2, and liquid crystal capacitance C
Lc1With liquid crystal capacitance C
Lc2Charge, because the voltage signal that is transmitted on the adjacent two drawing frame data lines can be anti-phase, the pixel electrode V in the therefore feasible time pixel 3011 and 3012
PaWith pixel electrode V
PbAll present data line D
1On the voltage 6016 that transmitted.
When period T 5, zone each sweep trace in 1 is finished by sweep signal scanning all, this moment in pixel cell 301, sweep trace G
1Present the low level state, so transistor Q
1And Q
2To be closed, so pixel electrode V
PaWith pixel electrode V
PbTo maintain data line D
1On the voltage 6016 that transmitted.But can become 4V by the 5V modulation in order to the voltage quasi position that drives time pixel 3011 common electrode Vcom (A) in the time of therefore, the change in voltage on this common electrode Vcom (A) can see through storage capacitors C
St1Coupling effect influence pixel electrode V
PaOn voltage, make pixel electrode V
PaOn voltage drop to voltage 6017 by voltage 6016.And also becoming 7V by the 5V modulation in order to the voltage quasi position that drives time pixel 3012 common electrode Vcom (B), the change in voltage on this common electrode Vcom (B) can see through storage capacitors C
St2Coupling effect influence pixel electrode V
PbOn voltage, make pixel electrode V
PbOn voltage rise to voltage 6018 by voltage 6016.And make the pixel electrode V in inferior pixel 3011 and time pixel 3012
PaAnd V
PbPresent different pixel voltages respectively.
When period T 6, zone each sweep trace in 1 is finished by sweep signal scanning all, this moment in pixel cell 301, sweep trace G
1Present the low level state, so transistor Q
1And Q
2Be closed, so pixel electrode V
PaWith pixel electrode V
PbVoltage status in the time of will maintaining period T 5.Therefore, each pixel cell of the present invention all has for 2/3 picture frame time at least at a picture frame in the time, its pixel electrode V
PaWith pixel electrode V
PbHas different display voltage.And same pixel electrode has identical variation situation between adjacent two picture frames.
Consulting Fig. 7 A is depicted as according to fourth embodiment of the invention in order to drive the drive waveforms of a liquid crystal panel common electrode.The scanning line driving waveform of wherein being painted is meant from the 1st sweep trace and is urged to the last item sweep trace in regular turn.In addition in the present embodiment also hypothesis each sweep trace that will form a liquid crystal panel be divided into three districts, be respectively zone 1, zone 2 and regional 3, but the present invention is not limited in and is distinguished into three zones.And each picture frame time, also be divided into three time section T 1, T2 and T3, wherein time section T 1 is arranged in the sweep trace time in zone 1, time section T 2 is arranged in zone 2 for scanning 3 sweep trace times that are arranged in zone 3 for scanning of sweep trace time, time section T for scanning.Present embodiment and the 3rd embodiment maximum different be in, the drive waveforms on the common electrode Vcom (B) is for deciding 5 volts of drive waveforms of voltage.
For zone 1, in time section T 1, the sweep trace in zone 1 is driven by sweep signal, and the driving voltage on the common electrode Vcom (B) remains on 5 volts, and the driving voltage on the common electrode Vcom (A) is a reference voltage, so pixel electrode V in each pixel cell
PaWith pixel electrode V
PbThe voltage that can present on the data line in regular turn to be transmitted makes pixel electrode V in each pixel cell
PaWith pixel electrode V
PbPresent identical display voltage.And in time section T 2, because the sweep trace in zone 1 is not driven by sweep signal, and the driving voltage on the common electrode Vcom (B) remains on 5 volts, and the driving voltage on the common electrode Vcom (A) can switch, so pixel electrode V in each pixel cell
PaWith pixel electrode V
PbHas different display voltage.And in time section T 3, because zone 1 sweep trace is not driven by sweep signal, and the driving voltage waveform on common electrode Vcom (A) and the Vcom (B) remains unchanged, so pixel electrode V in each pixel cell
PaWith pixel electrode V
PbRemain on voltage shown in the time section T 2.
For zone 2, in time section T 1, because zone 2 sweep trace is not driven by sweep signal, so the show state of each pixel cell when remaining on a picture frame, i.e. pixel electrode V
PaWith pixel electrode V
PbHas different display voltage.And in time section T 2, the sweep trace in zone 2 is driven by sweep signal, and the driving voltage on common electrode Vcom (A) and the Vcom (B) remains on 5 volts, at this moment the pixel electrode V in each pixel cell
PaWith pixel electrode V
PbCan present the voltage that is transmitted on the data line D in regular turn, make pixel electrode V in each pixel cell
PaWith pixel electrode V
PbPresent identical display voltage.And in time section T 3, because the sweep trace in zone 2 is not driven by sweep signal, and the driving voltage waveform on the common electrode Vcom (A) can be switched, so pixel electrode V in each pixel cell
PaWith pixel electrode V
PbHas different display voltage.
Zone 3, in time section T 1, because zone 3 sweep trace is not driven by sweep signal, so the show state of each pixel cell when remaining on a picture frame, i.e. pixel electrode V in each pixel cell
PaWith pixel electrode V
PbHas different display voltage.And in time section T 2, zone 3 sweep trace is not driven by sweep signal, and the driving voltage waveform on common electrode Vcom (A) and the Vcom (B) remains unchanged, so pixel electrode V in each pixel cell
PaWith pixel electrode V
PbRemain on voltage shown in the time section T 1.And in time section T 3, zone 3 sweep trace is driven by sweep signal, and the driving voltage waveform on common electrode Vcom (A) and the Vcom (B) reverts to primary voltage, at this moment the pixel electrode V in each pixel cell
PaWith pixel electrode V
PbCan present the voltage that is transmitted on the data line D in regular turn, make pixel electrode V in each pixel cell
PaWith pixel electrode V
PbPresent identical display voltage.In other words, according to the present invention, each pixel cell in the time, has for 2/3 picture frame time at a picture frame at least, its pixel electrode V
PaWith pixel electrode V
PbHas different display voltage.
Consult shown in Fig. 7 B, then for be positioned at the drive waveforms of zone 1 each pixel cell in order to driving according to fourth embodiment of the invention.Regional drive waveforms can the rest may be inferred for other.The drive waveforms of sweep trace is an impulse form, and drives each sweep trace with the way of output in proper order.In addition, the drive waveforms of common electrode Vcom (A) system adopts the three-stage type driving method in the present embodiment, the conversion between 4V, 5V and 7V of the voltage quasi position of its driving voltage waveform, and the drive waveforms of common electrode Vcom (B) is for deciding voltage 5V.Because traditionally for the yawing moment of avoiding liquid crystal molecule is fixed in on one side, so the data voltage that is transmitted on data line conversion between generating positive and negative voltage.And because the drive waveforms of common electrode Vcom (A) changes, be example with picture frame K, all be to promote pixel electrode V
PaOn the pixel voltage that presented, therefore, if the data voltage that is transmitted on the data line, during generating positive and negative voltage week, all transmit equal sizes, after modulation through common electrode Vcom (A), to cause pixel electrode to have different voltages, though and make under same voltage data, but can cause the liquid crystal deflection angle difference and form demonstration difference, therefore can import different data line voltages in positive period respectively during with negative cycle, after seeing through the modulation of common electrode again, each pixel cell will present identical pixel electrode voltage in positive period with negative cycle.
Please consult Fig. 3 C and Fig. 7 B simultaneously.When the period T 1 of picture frame K, each sweep trace in the zone 1 is scanned by sweep signal in regular turn, and the driving voltage on common electrode Vcom (A) and the Vcom (B) all remains on 5 volts.This moment in pixel cell 301, sweep trace G
1Be the high levels state, so transistor Q
1And Q
2To be switched on.This moment data line D
1On the voltage signal that transmitted, can be respectively via transistor Q
1And Q
2To storage capacitors C
St1With storage capacitors C
St2, and liquid crystal capacitance C
Lc1With liquid crystal capacitance C
Lc2Charge the pixel electrode V in the feasible time pixel 3011 and 3012
PaWith pixel electrode V
PbAll present data line D
1On the voltage 3 that transmitted.And owing to voltage-type is decided in the drive waveforms employing of common electrode Vcom (B) in the present embodiment, for avoiding between positive voltage period and negative voltage period, because of driving, common electrode cause pixel electrode to have different voltages, therefore, import different data line voltages in positive voltage period respectively with negative voltage period, and, can make twice pixel in the pixel cell all to have identical pixel voltage in the positive voltage period negative voltage period after common electrode modulation.According to an embodiment, positive voltage period data line D
1If input+127 grayscale voltage 7013, then when negative voltage period, data line D
1The grayscale voltage 7014 of input-150.
When period T 2, zone each sweep trace in 1 is finished by sweep signal scanning all, this moment in pixel cell 301, sweep trace G
1Present the low level state, so transistor Q
1And Q
2To be closed, so pixel electrode V
PaWith pixel electrode V
PbTo maintain data line D
1On the voltage that transmitted, if at pixel cell 1, then be+127 grayscale voltage 7013, as if at pixel cell 2, then be-150 grayscale voltage 7014.But can become 7V by the 5V modulation in order to the voltage quasi position that drives time pixel 3011 common electrode Vcom (A) in the time of therefore, the change in voltage on this common electrode Vcom (A) can see through storage capacitors C
St1Coupling effect influence pixel electrode V
PaOn voltage, make pixel electrode V
PaOn voltage rise.If at pixel cell 1, be to rise to grayscale voltage 7015 by grayscale voltage 7013 for+127, if at pixel cell 2, then rise to grayscale voltage 7016 by-150 grayscale voltage 7014.And all remain on 5V in order to the voltage quasi position that drives time pixel 3012 common electrode Vcom (B), make pixel electrode V
PbOn voltage constant, also even at pixel cell 1, then remain on+127 grayscale voltage 7013, if at negative voltage pixel cell 2, then remain on-150 grayscale voltage 7014.And make the pixel electrode V in inferior pixel 3011 and time pixel 3012
PaAnd V
PbPresent different pixel voltages respectively.And because data line of the present invention is imported different grayscale voltages in positive voltage period and negative voltage period system, so when period T 2, two pixel electrodes in its pixel cell 302, the cramping size that it presented is all identical with negative voltage period in positive voltage period.
When period T 3, zone each sweep trace in 1 is finished by sweep signal scanning all, this moment in pixel cell 301, sweep trace G
1Present the low level state, so transistor Q
1And Q
2To be closed, so pixel electrode V
PaWith pixel electrode V
PbVoltage status in the time of will maintaining period T 2.
Then carry out the scanning of adjacent frames K+1, this moment, sweep signal can scan from article one sweep trace again in regular turn, and when the period T 4 of picture frame K+1, zone each sweep trace in 1 is scanned by sweep signal in regular turn, this moment in pixel cell 301, sweep trace G
1Be the high levels state, and the voltage quasi position of common electrode Vcom (A) and common electrode Vcom (B) all reverts to the accurate position of primary voltage, 5V.This moment transistor Q
1And Q
2To be switched on.Data line D
1On the voltage signal that transmitted, can be respectively via transistor Q
1And Q
2To storage capacitors C
St1With storage capacitors C
St2, and liquid crystal capacitance C
Lc1With liquid crystal capacitance C
Lc2Charge.Therefore the pixel electrode V in the feasible time pixel 3011 and 3012
PaWith pixel electrode V
PbThe data line D that all presents
1On the voltage that transmitted.According to an embodiment, if at pixel cell 1, then be-127 grayscale voltage 7017, if at pixel cell 2, then be+150 grayscale voltage 7018.
When period T 5, zone each sweep trace in 1 is finished by sweep signal scanning all, this moment in pixel cell 301, sweep trace G
1Present the low level state, so transistor Q
1And Q
2To be closed, so pixel electrode V
PaWith pixel electrode V
PbTo maintain data line D
1On the voltage that transmitted.But can become 4V by the 5V modulation in order to the voltage quasi position that drives time pixel 3011 common electrode Vcom (A) in the time of therefore, the change in voltage on this common electrode Vcom (A) can see through storage capacitors C
St1Coupling effect influence pixel electrode V
PaOn voltage, make pixel electrode V
PaOn voltage change.According to present embodiment, if at pixel cell 1, be to drop to grayscale voltage 7019 by grayscale voltage 7017 for-127, if at pixel cell 2, then be to drop to grayscale voltage 7020 by+150 grayscale voltage 7018.And all remain on 5V in order to the voltage quasi position that drives time pixel 3012 common electrode Vcom (B), make pixel electrode V
PbOn voltage constant, therefore if at pixel cell 1, then remain on-127 grayscale voltage 7017, if in negative voltage period, then remain on+150 grayscale voltage 7018.And make the pixel electrode V in inferior pixel 3011 and time pixel 3012
PaAnd V
PbPresent different pixel voltages respectively.
When period T 6, zone each sweep trace in 1 is finished by sweep signal scanning all, this moment in pixel cell 301, sweep trace G
1Present the low level state, so transistor Q
1And Q
2To be closed, so pixel electrode V
PaWith pixel electrode V
PbVoltage status in the time of will maintaining period T 5.Therefore, each pixel cell of the present invention all has for 2/3 picture frame time at least at a picture frame in the time, its pixel electrode V
PaWith pixel electrode V
PbHas different display voltage.And same pixel electrode has identical variation situation between adjacent two picture frames.
It should be noted that above-mentioned driving method also can be used in the liquid crystal panel that a pair of drives, be illustrated in figure 8 as the summary icon of a use dual-drive technology liquid crystal panel.Wherein, the driving voltage of sweep trace is separated to provide in regional A and the area B, and in other words, the driving voltage of sweep trace is independently of one another in regional A and the area B, separately drives.In addition, the display voltage of regional each pixel cell of A is controlled by data line drive integrated circult 801, and the display voltage of each pixel cell in the area B is then controlled by data line drive integrated circult 802.
According to the present invention, each sweep trace in regional and regional A and the area B is also carried out subregion respectively, and with to the common electrode in the different scanning line interval, timesharing provides driving voltage.In this embodiment, because the driving voltage of sweep trace is independently of one another in regional A and the area B, separately drive, therefore in individual areas, can significantly shorten in order to the driving time that carries out sweep trace, and then increase each pixel cell and be subjected to common electrode to carry out the time of voltage modulated state.
On the other hand, common electrode driving voltage of the present invention is not limited in the described waveform state of the foregoing description.In other embodiments, common electrode Vcom (A) and common electrode Vcom (B) also can use the driving voltage waveform shown in Fig. 9 A to Fig. 9 E.
According to the common electrode drive waveforms shown in Fig. 9 A, the drive waveforms of its common electrode Vcom (A) is switched between 5V and 6V, and the drive waveforms of common electrode Vcom (B) is switched between 5V and 4V, originally is pixel electrode V under the data line voltage state to promote and to reduce in the pixel cell
PaWith pixel electrode V
PbMake two pixel electrodes have different display voltage.
According to the common electrode drive waveforms shown in Fig. 9 B, the drive waveforms of its common electrode Vcom (A) is switched between 5V and 6V, and the drive waveforms of common electrode Vcom (B) then is maintained at 5V.
And according to the common electrode drive waveforms shown in Fig. 9 C, the drive waveforms of its common electrode Vcom (A) is a square wave, continues to switch between 5V and 6V, and the drive waveforms of common electrode Vcom (B) then is maintained at 5V.According to present embodiment, its optical appearance will depend on r.m.s. (rootmean square) voltage of square wave drive waveform.In other embodiments, the drive waveforms of common electrode Vcom (B) also can be switched between 5V and 4V shown in Fig. 9 D.
In addition according to the common electrode drive waveforms shown in Fig. 9 E, the drive waveforms of its common electrode Vcom (A) is switched between 4V and 6V, and the drive waveforms of common electrode Vcom (B) is switched between 4V and 5V, is changed by different common electrode voltage, makes two pixel electrode V
PaWith pixel electrode V
PbHas different display voltage.
Comprehensive above-mentioned institute says, the present invention is by being divided into a pixel unit area twice pixel, and all has separately transistor, liquid crystal capacitance and storage capacitors in pixel each time.Wherein the storage capacitors body of twice pixel is coupled to different common electrodes respectively, and at least one common electrode wherein has the voltage modulated waveform.This voltage modulated waveform can change the pixel electrode voltage that presents the contained voltage data of data line originally, so that twice pixel has different pixel voltages.These two kinds of different pixel voltages can form the different optical characteristic, and compensation is average mutually, and the colour cast in the pixel cell that therefore can ease up now looks like.
Though the present invention discloses as above with a preferred embodiment; right its is not in order to limiting the present invention, anyly has the knack of this skill person, without departing from the spirit and scope of the present invention; when can being used for a variety of modifications and variations, thus protection scope of the present invention when with claim the person of being defined be as the criterion.
Claims (20)
1. the driving method of a LCD, in order to drive a dot structure, this dot structure is divided into the N district, N is a positive integer, each district comprises a plurality of sweep traces, a plurality of data lines and a plurality of first and second common electrodes, it is characterized in that, described common electrode and described sweep trace are staggered, adjacent data line and sweep trace define a pixel cell, and each pixel cell comprises the pixel first time that is defined by the described sweep trace and adjacent first common electrode, and the pixel second time that defines by the described sweep trace and adjacent second common electrode, pixel has the first transistor and first storage capacitors that couples described first common electrode for the first time, pixel has transistor seconds and second storage capacitors that couples described second common electrode for the second time, and described method comprises following steps:
Provide the one scan signal to described sweep trace in regular turn, with the described the first transistor and the described transistor seconds of each pixel cell of conducting;
Provide a grey scale signal to described data line in regular turn, to see through described the first transistor described grey scale signal is write described first storage capacitors and forms one first pixel electrode voltage, and described grey scale signal is write described second storage capacitors and forms one second pixel electrode voltage through described transistor seconds; And
Provide one first voltage to described first common electrode that is positioned at described m district and provide one second voltage to described second common electrode that is positioned at described m district, m=1 wherein ... N, after the described sweep signal in m district has scanned the sweep trace that is positioned at the m district, provide one first signal to described first common electrode that is positioned at described m district and provide a secondary signal to described second common electrode that is positioned at described m district, wherein said first signal can see through described first storage capacitors and change described first pixel electrode voltage, and described secondary signal can see through described second storage capacitors and change described second pixel electrode voltage.
2. the driving method of LCD as claimed in claim 1 is characterized in that, described sweep signal is a pulse signal.
3. the driving method of LCD as claimed in claim 1 is characterized in that, described first signal and described secondary signal are a second order signal.
4. the driving method of LCD as claimed in claim 3 is characterized in that, described first signal is made up of one first voltage and one second voltage, and described secondary signal is made up of a tertiary voltage and one the 4th voltage.
5. the driving method of LCD as claimed in claim 4, it is characterized in that, after described sweep signal has scanned the sweep trace that is positioned at the m district, described first signal can switch to described second voltage by described first voltage, and described secondary signal can switch to described the 4th voltage by described tertiary voltage.
6. the driving method of LCD as claimed in claim 4, it is characterized in that, after described sweep signal has scanned the sweep trace that is positioned at the m district, described first signal can switch to described first voltage by described second voltage, and described secondary signal can switch to described tertiary voltage by described the 4th voltage.
7. the driving method of LCD as claimed in claim 1 is characterized in that, described first signal and described secondary signal are one or three rank signals.
8. the driving method of LCD as claimed in claim 7 is characterized in that, described first signal is made up of one first voltage, one second voltage and a tertiary voltage, and described secondary signal is made up of one the 4th voltage, one the 5th voltage and one the 6th voltage.
9. the driving method of LCD as claimed in claim 8, it is characterized in that, at a picture frame in the time, after described sweep signal has scanned the sweep trace that is positioned at the m district, described first signal can switch to described second voltage by described first voltage, and described secondary signal can switch to described the 5th voltage by described the 4th voltage, and at next picture frame in the time, after described sweep signal has scanned the sweep trace that is positioned at the m district, described first signal can switch to described tertiary voltage by described first voltage, and described secondary signal can switch to described the 6th voltage by described the 4th voltage.
10. the driving method of LCD as claimed in claim 1 is characterized in that, described first signal is one or three rank signals, and described secondary signal is the certain voltage signal.
11. the driving method of LCD as claimed in claim 10 is characterized in that, described first signal is made up of one first voltage, one second voltage and a tertiary voltage.
12. the driving method of LCD as claimed in claim 11, it is characterized in that, at a picture frame in the time, after described sweep signal has scanned the sweep trace that is positioned at the m district, described first signal can switch to described second voltage by described first voltage, and at next picture frame in the time, after described sweep signal had scanned the sweep trace that is positioned at the m district, described first signal can switch to described tertiary voltage by described first voltage.
13. the driving method of LCD as claimed in claim 1, it is characterized in that, in an image time, providing a grey scale signal also to comprise in regular turn to the step of described data line, in a positive polarity pixel, corresponding one first grey scale signal is set, and in a negative polarity pixel, corresponding one second grey scale signal is set.
14. the driving method of LCD as claimed in claim 1 is characterized in that, the dot structure in described N district more is divided into two districts, drives respectively.
15. the driving method of LCD as claimed in claim 14 is characterized in that, the described dot structure that is divided into two districts is connected driving with the unlike signal data line respectively.
16. the driving method of LCD as claimed in claim 1 is characterized in that, described first signal is a second order signal, and described secondary signal is the certain voltage signal.
17. the driving method of LCD as claimed in claim 1 is characterized in that, described first signal is a second order signal, and described secondary signal is a square-wave signal.
18. the driving method of LCD as claimed in claim 1 is characterized in that, described first signal is a square-wave signal, and described secondary signal is the certain voltage signal.
19. the driving method of LCD as claimed in claim 1 is characterized in that, described first signal is selected from certain voltage signal, a square-wave signal, a second order signal and one or three rank signals and forms in the group one of them.
20. the driving method of LCD as claimed in claim 1 is characterized in that, described secondary signal is selected from certain voltage signal, a square-wave signal, a second order signal and one or three rank signals and forms in the group one of them.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN200710005515A CN100580760C (en) | 2007-02-09 | 2007-02-09 | Driving method of liquid crystal display |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN200710005515A CN100580760C (en) | 2007-02-09 | 2007-02-09 | Driving method of liquid crystal display |
Publications (2)
| Publication Number | Publication Date |
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| CN101013564A true CN101013564A (en) | 2007-08-08 |
| CN100580760C CN100580760C (en) | 2010-01-13 |
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| CN200710005515A Expired - Fee Related CN100580760C (en) | 2007-02-09 | 2007-02-09 | Driving method of liquid crystal display |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101625824B (en) * | 2008-07-10 | 2012-11-07 | 立景光电股份有限公司 | Pixel unit and driving method thereof |
| CN103531162A (en) * | 2013-07-29 | 2014-01-22 | 矽创电子股份有限公司 | Driving circuit for display |
| CN104240662A (en) * | 2014-09-10 | 2014-12-24 | 京东方科技集团股份有限公司 | Method and device for improving image crosstalk |
| WO2016095317A1 (en) * | 2014-12-16 | 2016-06-23 | 深圳市华星光电技术有限公司 | Liquid crystal display panel and driving method therefor |
| WO2016141605A1 (en) * | 2015-03-09 | 2016-09-15 | 深圳市华星光电技术有限公司 | Driving method and driver device for liquid crystal display |
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- 2007-02-09 CN CN200710005515A patent/CN100580760C/en not_active Expired - Fee Related
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| CN101625824B (en) * | 2008-07-10 | 2012-11-07 | 立景光电股份有限公司 | Pixel unit and driving method thereof |
| CN103531162B (en) * | 2013-07-29 | 2016-09-28 | 矽创电子股份有限公司 | Driving circuit for display |
| CN103531162A (en) * | 2013-07-29 | 2014-01-22 | 矽创电子股份有限公司 | Driving circuit for display |
| CN104240662A (en) * | 2014-09-10 | 2014-12-24 | 京东方科技集团股份有限公司 | Method and device for improving image crosstalk |
| CN104240662B (en) * | 2014-09-10 | 2016-06-29 | 京东方科技集团股份有限公司 | A kind of method and apparatus improving picture crosstalk |
| WO2016095317A1 (en) * | 2014-12-16 | 2016-06-23 | 深圳市华星光电技术有限公司 | Liquid crystal display panel and driving method therefor |
| WO2016141605A1 (en) * | 2015-03-09 | 2016-09-15 | 深圳市华星光电技术有限公司 | Driving method and driver device for liquid crystal display |
| US9858843B2 (en) | 2015-03-09 | 2018-01-02 | Shenzhen China Star Optoelectronics Technology Co., Ltd | Drive method and drive device of liquid crystal display employing color washout compensation of image pixels based on skin color weights of primary color components |
| CN113393789A (en) * | 2021-05-20 | 2021-09-14 | 北海惠科光电技术有限公司 | Display panel driving method and device and display device |
| CN113393788A (en) * | 2021-05-20 | 2021-09-14 | 北海惠科光电技术有限公司 | Display panel driving method and device and display device |
| CN113391490A (en) * | 2021-05-20 | 2021-09-14 | 北海惠科光电技术有限公司 | Display panel driving method, display panel and display device |
| CN113393787A (en) * | 2021-05-20 | 2021-09-14 | 北海惠科光电技术有限公司 | Display panel driving method, display panel driving device and display device |
| CN113380207A (en) * | 2021-05-31 | 2021-09-10 | 北海惠科光电技术有限公司 | Display panel driving method and display device |
| CN113380206A (en) * | 2021-05-31 | 2021-09-10 | 北海惠科光电技术有限公司 | Display panel driving method and display device |
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