CN101840675B - Driving method of dynamic driving field-sequential color liquid crystal display - Google Patents
Driving method of dynamic driving field-sequential color liquid crystal display Download PDFInfo
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Abstract
The invention relates to a driving method of a dynamic driving field-sequential color liquid crystal display. In a passive array dynamic driving field-sequential color liquid crystal display of which the backlight source at least comprises two or more than two colors, each field comprises the scanning time and the non-scanning time of a COM (Component Object Model), during the scanning time, all liquid crystal pixels are driven by each COM according to a canning process in a certain sequence. The non-scanning time means the time when the liquid crystal pixels are not driven and the backlight source is lightened continuously, and the non-scanning time is between 1 microsecond and 10 microseconds. The invention has the advantage that all the liquid crystal pixels have almost identical display color and uniform color purity and brightness in the same field.
Description
Technical field
The present invention relates to a kind of driving method of passive battle array square dynamic driving field-sequential color liquid crystal display.
Background technology
The field-sequential color liquid crystal demonstration normally is divided into three pictures (field) to a colour picture (frame) to red (R), green (G), blue (B) by the time in turn, then switches in turn at a high speed those pictures (field) and consists of a colour picture (frame).If adopt R, G, B three primary colours, then the time of each place demonstration is 1/3 of the shown time of frame, and namely three fields consist of frame periods.If 2 looks or 4 looks, the time that each place shows just is 1/2 or 1/4 of the shown time in frame period, and namely 2 fields or 4 fields consist of a frame period, and all the other situations are analogized.The driving method of liquid crystal display mainly divides driven with active matrix and passive matrix (or simple matrix) to drive two large modes on the other hand.The latter is also referred to as dynamic driving, form matrix by a plurality of COM and a plurality of SEG intersection, when certain COM of scanning, on by the selected liquid crystal picture of SEG voltage number, can add selection voltage (ON voltage), non-selected liquid crystal picture number can add non-selection voltage (OFF voltage).
Existing dynamic driving field-sequential color liquid crystal display, its general structure comprises LCDs, backlight, backlight driver and LCDs driver, described backlight is arranged at the bottom side of LCDs, and described backlight driver and LCDs driver drive respectively backlight and LCDs.The driving method of this dynamic driving field-sequential color liquid crystal display, Figure 10 is the example that positive display mode (liquid crystal display is transmissive state during OFF voltage) 1/2 dutycycle drives, obviously, other dutycycle drives and also has same following problems, as shown in the figure, when we input respectively identical red drive waveforms from COM1 and COM2, liquid crystal pixel is opened in the red light zone, in the green lamp zone, close.In order to eliminate flip-flop, the polarity of same interior drive waveforms is reversed once at least.Because liquid crystal material has a time-delay response time to driving voltage, when adding ON voltage or OFF voltage for the liquid crystal pixel, corresponding to ON response time or OFF response time, its penetrating light intensity has one to descend and elevated areas, the factor that affects the color homogeneous mainly is elevated areas (i.e. dotted portion among the figure, also steelyard slepsydra light quantity), because COM1 is different with the residing time period of COM2, the elevated areas of COM1 is in the cyan zone, the elevated areas of COM2 is in red area, although the redness of COM1 is with the composition of cyan, its red intensity that sees through is greater than COM2, and the light leak amount of cyan is less than COM2.The redness that has so just caused COM1 in the same picture is red different from COM2's.When certainly showing other colors too same situation can appear.If we use negative display mode (liquid crystal display is the projection state during ON voltage), as shown in figure 11, when we input respectively identical color drive waveforms from COM1 and COM2, for example during red drive waveforms, the redness of the COM2 zone that descends is in follow-up cyan zone.And COM1 does not have the cyan light leak.Cause the accumulation of every kind of color of COM1 and COM2 to see through light intensity different, cause final show red different, like this with regard to so that the purity of color, the homogeneity of color all can change, and the homogeneity of display brightness also can change thereupon.If with this class display of other dutycycle, as with 1/3,1/4,1/8 ... also there is same problem in 1/N.
Summary of the invention
The present invention seeks to overcome defects, if provide a kind of drive waveforms identical, the Show Color of the liquid crystal pixel of all COM in same is basically identical, improves the driving method of the passive battle array square dynamic driving field-sequential color liquid crystal display of colour purity.
Another object of the present invention is to improve the homogeneity of the color of passive battle array square dynamic driving field-sequential color liquid crystal display.
A further object of the present invention is to improve the homogeneity of the brightness of passive battle array square dynamic driving field-sequential color liquid crystal display.
Also purpose of the present invention is in order to reduce the low-limit frequency of not glimmering of passive battle array square dynamic driving field-sequential color liquid crystal display.
Also purpose of the present invention is in order to reduce the cross effect of passive battle array square dynamic driving field-sequential color liquid crystal display.
A kind of driving method of dynamic driving field-sequential color liquid crystal display is provided, its backlight comprises in the passive battle array square dynamic driving field-sequential color liquid crystal display of two or more different colours at least, a plurality of consist of a frame, each comprises sweep time and the non-sweep time of COM, the driving of all liquid crystal pixels is to be finished by the process that each COM is scanned in certain sequence within sweep time, refers to non-sweep time at the rear all liquid crystal pixels not driven (namely all liquid crystal pixels are not applied in ON voltage) of end sweep time but the time that backlight continues to light.Described non-sweep time is between 1 to 10 millisecond.Better non-sweep time is between 1 to 4 millisecond, if non-sweep time is less than 1 millisecond, DeGrain when the response speed of liquid crystal is not bery fast, non-sweep time is during greater than 4 milliseconds, in the situation that a plurality of colour fields can make the sweep time of COM too short, need to strengthen driving voltage.
Need to prove: passive battle array square is for the Active Phased Array square, and so-called Active Phased Array square has added on-off element for exactly each pixel, and described on-off element is normally used to be the TFT element.When using the TFT element, the liquid crystal pixel of all COM is continued to keep being scanned rear drive voltage.And passive battle array square does not have the TFT components and parts, and the liquid crystal pixel of every COM is no longer kept being scanned rear drive voltage, causes the liquid crystal pixel of different COM to be in the different time periods in the process that is returned to non-pressurised state from pressurized state.Can not equally with the liquid crystal pixel of other COM in same, finish the process that is returned to non-pressurised state from pressurized state so that be in the liquid crystal pixel of the terminal COM of scanning.So the length that we need to regulate non-sweep time according to the liquid crystal OFF response time in this liquid crystal display so that in each the accumulation of all liquid crystal pixels to see through light intensity basically identical.
In this method, within same sweep time, each described COM is scanned more than twice or twice, and the scanning sequency between the adjacent twice sweep is opposite.
Perhaps, in back to back two frames, in the sweep time of the field corresponding with the backlight of same color, the scanning sequency of each described COM is opposite.
Place after sweep time described non-sweep time.
Described passive battle array square dynamic driving field-sequential color liquid crystal display is no matter be in still negative display mode of positive display mode, and the voltage in non-sweep time between all COM and SEG is less than or equal to OFF voltage, is preferably no-voltage.OFF voltage is the voltage that liquid crystal pixel is added by seal when non-the selection.Although this voltage is not enough to drive liquid crystal pixel, when increase scanning COM counts, the cross effect of non-selection liquid crystal pixel is strengthened, affect display effect.So we preferably can reduce the voltage between COM and SEG in non-sweep time, are preferably the voltage that equals zero as far as possible.Here need to prove, although the COM within non-sweep time and the voltage between SEG can be no-voltage, in order to reduce the flip-flop on the liquid crystal pixel, the waveform separately of COM and SEG also can be that the waveform combination by positive-negative polarity forms.
Described passive battle array square dynamic driving field-sequential color liquid crystal display is that frame per second is the dynamic driving field-sequential color liquid crystal display between the 45Hz to 80Hz.
Described passive battle array square dynamic driving field-sequential color liquid crystal display is TN, STN, HTN, OCB, the non-bistable state dynamic driving field-sequential color liquid crystal display of VA class.
When the color of described backlight was two kinds of colors, two kinds of colors were complementary color, were white when namely lighting simultaneously.Perhaps the color of described backlight is red, green and blue.
Described passive battle array square dynamic driving field-sequential color liquid crystal display comprises LCDs, backlight, backlight driver and LCDs driver, described backlight is arranged at the bottom side of LCDs, and described backlight driver and LCDs driver drive respectively backlight and LCDs.
The lighting time of described backlight is the start time that lags behind described initial COM scanning, and its backlight postpones lighting time between the 0.5-2.0 millisecond.
The inverse of the dutycycle of the drive waveforms of described passive battle array square dynamic driving field-sequential color liquid crystal display equates with the actual COM number of display.
The inverse of the dutycycle of the drive waveforms of described passive battle array square dynamic driving field-sequential color liquid crystal display is greater than the actual COM number of display.
The present invention is owing to having adopted each COM in same all to be scanned, in each except the sweep time of COM, also increased non-sweep time, and backlight continues to light, like this, can effectively prevent the elevated areas (just aobvious) that see through intensity of last drive waveforms after outage, the zone (negative aobvious) that perhaps descends reaches in the color region of adjacent other, so that the accumulation of all liquid crystal pixels is basically identical through light intensity in each, greatly improved the consistance of the Show Color of this class display, improved the purity of color and the homogeneity of brightness, and the low-limit frequency of not glimmering that has reduced passive battle array square dynamic driving field-sequential color liquid crystal display.
Description of drawings
Figure 1A is that the present invention is in the just aobvious drive waveforms principle schematic of the B waveform that uses 1/4 dutycycle to drive.
Fig. 1 is that the present invention is in the just aobvious drive waveforms principle schematic of the B waveform that uses 1/2 dutycycle to drive.
Fig. 2 is that the present invention is in the just aobvious drive waveforms principle schematic of the B waveform that uses 1/3 dutycycle to drive.
Fig. 3 is the present invention in the just aobvious waveform principle schematic of the field scan reversed in order of same color in tight adjacent two frames of the B waveform that uses 1/2 dutycycle to drive.
Fig. 4 is that the present invention is in the just aobvious waveform principle schematic same interscan reversed in order of the B waveform that uses 1/3 dutycycle to drive.
Fig. 5 be the present invention the B waveform that uses 1/2 dutycycle to drive just aobvious same interscan reversed in order, and in tight adjacent two frames the also opposite waveform principle schematic of field scan order of same color.
Fig. 6 be the present invention the B waveform that uses 1/3 dutycycle to drive just aobvious same interscan reversed in order, and in tight adjacent two frames the also opposite waveform principle schematic of field scan order of same color.
Fig. 7 is that the present invention is in the negative aobvious drive waveforms principle schematic of the A waveform that uses 1/2 dutycycle to drive.
Fig. 8 is the just aobvious drive waveforms principle schematic that drives the display with 1/3 dutycycle with the driving ripple of 1/4 dutycycle.
Fig. 9 is the negative aobvious drive waveforms principle schematic that drives the display with 1/3 dutycycle with the driving ripple of 1/4 dutycycle.
Figure 10 is the just aobvious drive waveforms schematic diagram of existing dynamic driving field-sequential color liquid crystal display A waveform.
Figure 11 is the negative aobvious drive waveforms schematic diagram of existing dynamic driving field-sequential color liquid crystal display A waveform.
Embodiment
Among the embodiment among the present invention, the major part that gives an actual example is that backlight is that example is illustrated by two or three different colours display, but, need to prove, the present invention is suitable for having the display of the different colours more than three kinds equally, such as the display of four kinds of different colours or five kinds of different colours etc.When the color of backlight was two kinds of colors, preferably two kinds of colors were complementary color.The color combination of the most frequently used backlight is the red, green and blue three primary colours among the present invention.
Passive battle array square dynamic driving field-sequential color liquid crystal display among the present invention, its basic structure generally comprises LCDs, backlight, backlight driver and LCDs driver, described backlight is arranged at bottom or the sidepiece of LCDs, and described backlight driver and LCDs driver drive respectively the structure of backlight and LCDs.It also can be the liquid crystal display that to select suitable bias voltage.Liquid crystal display among the present invention can be positive and negative each driving of each COM difference liquid crystal display once in each.Liquid crystal display among the present invention can be TN, STN, HTN, OCB, any in the non-bistable state dynamic driving field-sequential color liquid crystal display of VA class; Described dynamic driving field-sequential color liquid crystal display is the dynamic driving field-sequential color liquid crystal display that frame per second can be regulated between 45Hz to 80Hz.
Need to prove usually and when dynamic driving, need in same, carry out the waveform counter-rotating, at this moment have two kinds of waveforms (A waveform and B waveform) to adopt.The A waveform is COM1 (+) COM1 (-) COM2 (+) COM2 (-), and the B waveform is COM1 (+) COM2 (+) COM1 (-) COM2 (-).We in the present note most of B waveform that adopts do example.The A waveform of certainly not giving an example is applicable too.
Described backlight delay lighting time is preferably in the selection between the 0.5-2.0 millisecond.
Embodiment 1A
See also Figure 1A, Figure 1A is that the present invention is in the just aobvious drive waveforms principle schematic of the B waveform that uses 1/4 dutycycle to drive.The present embodiment has adopted the TN type liquid crystal display of just aobvious mode, and bias voltage is 1/3, and the OFF response time of liquid crystal is 10 milliseconds.It adopts the LED-backlit source of two kinds of different colours (redness, cyan), drives with 1/4 dutycycle, and actual COM number is 4; Each COM that (has same color in same, lower same) in same all is sequentially scanned 2 times and positive-negative polarity reverses once.Frame frequency is that 40Hz is variable to 60Hz.Be variable between 0 millisecond to 11 milliseconds non-sweep time, the virtual voltage that liquid crystal pixel applies in non-sweep time is that 0V is variable to OFF voltage (OFF voltage is 2V), and in non-sweep time the positive and negative counter-rotating of waveform separately of COM and SEG once, backlight continues to light.
We are decided to be 40Hz to frame frequency, and two kinds of color field take respectively 12.5 milliseconds, and it is red that we allow all liquid crystal pixels show, when we are decided to be 0 millisecond to non-sweep time, find in the same picture red widely different between the different COM.
When we lengthen non-sweep time gradually, find that the aberration between the different COM reduces gradually.Here we non-sweep time take degree of passing as 0.5 millisecond, when progressively being increased to 10 milliseconds since 0 millisecond (from 0 millisecond, 0.5 millisecond, 1 millisecond, 1.5 milliseconds, 2 milliseconds, 2.5 milliseconds, 3 milliseconds, 3.5 milliseconds, 4 milliseconds, 4.5 milliseconds, 5 milliseconds, 5.5 milliseconds, 6 milliseconds, 6.5 milliseconds, 7 milliseconds, 7.5 milliseconds, 8 milliseconds, 8.5 milliseconds, 9 milliseconds, 9.5 milliseconds, 10 milliseconds progressively tests), find since 1 millisecond to 10 milliseconds till aberration improve still effective.And non-sweep time is longer, and it is better that aberration improves.If but continue to increase non-sweep time, because sweep time is too short, need to improve driving voltage too large, be difficult to practicality.
When being changed the 0V, the above results is constant from OFF voltage for the virtual voltage that liquid crystal pixel is applied in non-sweep time in above-described embodiment, but we find that liquid crystal pixel presents small cross effect when applying OFF voltage.If we reduce the voltage that liquid crystal pixel in non-sweep time is applied in, cross effect reduces gradually, and when voltage was reduced to 0V, cross effect disappeared substantially, so the voltage that liquid crystal pixel is applied in non-sweep time is the smaller the better, is preferably no-voltage.
When frame frequency is decided to be 40Hz in above-described embodiment, sometimes have flickering, when we heightened frame frequency, flickering can disappear.Preferably frame frequency is decided to be 45Hz between the 60Hz.But after frame frequency improved, the time of each colour field can shorten, and the length of non-sweep time also can shorten, and at this moment we need the corresponding OFF response time that shortens liquid crystal pixel.
Embodiment 2 (not drawing)
The just aobvious drive waveforms of B waveform that the present invention uses 1/8 dutycycle to drive has adopted the TN type liquid crystal display that just shows mode, and bias voltage is 1/4, and the OFF response time of liquid crystal is 6 milliseconds.It adopts the LED-backlit source of three kinds of different colours (R, G, B), drives with 1/8 dutycycle, and actual COM number is 8; Each COM in same all is sequentially scanned 2 times and positive-negative polarity reverses once.Frame frequency is decided to be 50Hz.Be variable between 0 millisecond to 6 milliseconds non-sweep time, and the virtual voltage that liquid crystal pixel applies in non-sweep time is 0V, and backlight continues to light.
When frame frequency was decided to be 50Hz, three kinds of color field took respectively 6.67 milliseconds, and it is red that we allow all liquid crystal pixels show, when we are decided to be 0 millisecond to non-sweep time, found that the color distortion between the different COM is very large in the same picture.When we lengthen non-sweep time gradually, find that the aberration between the different COM reduces gradually.When we non-sweep time take degree of passing as 0.5 millisecond, when progressively being increased to close to 6 milliseconds since 1 millisecond, find that aberration improves still effective, but driving voltage needs to increase.If increase again non-sweep time, because sweep time is too short, need to improve driving voltage too large, be difficult to practicality.
See also Fig. 1, Fig. 1 is that the present invention is in the just aobvious drive waveforms principle schematic of the B waveform that uses 1/2 dutycycle to drive.Dotted portion among the figure is the light leak amount.Only draw the signal zone of light leak amount among the present invention in Fig. 1 T and Figure 10, also there is the light leak amount in the region of interest in other the accompanying drawing, can analogize.
The present embodiment has adopted the TN type liquid crystal display of just aobvious mode, and bias voltage is 1/2, and the OFF response time of liquid crystal is 3 milliseconds.It adopts the LED-backlit source of three kinds of different colours (R, G, B), drives with 1/2 dutycycle, and actual COM number is 2; Each COM in same all is sequentially scanned 2 times and positive-negative polarity reverses once.Frame frequency is 60Hz.Be between 0 millisecond to 4 milliseconds in non-sweep time, the virtual voltage that liquid crystal pixel applies in non-sweep time is 0 voltage, and backlight continues to light.
It is red that we allow all liquid crystal pixels show, when we were decided to be 0 millisecond to non-sweep time, the redness of COM1 and COM2's was red widely different in the discovery same picture.
When we are decided to be 1 millisecond to non-sweep time, because COM2 covers by non-scanning area the very most of of elevated areas of green and blue penetrating light intensity, the difference of the redness of the redness of COM1 in the same picture and COM2 is improved.
When we are decided to be 3 milliseconds to non-sweep time, discovery is after red drive waveforms of COM2 input, the elevated areas of the green penetrating light intensity of COM2 is in the green non-scanning area identical with COM1, can not enter the blue region of next frame, the elevated areas of the blue penetrating light intensity of this COM2 is in the blue non-scanning area identical with COM1, can not enter the red area of next frame, the light leak amount of 2 COM is basic identical, also to be that the accumulation of all liquid crystal pixels in each sees through light intensity basically identical, so just realized that the redness of COM1 in the same picture and COM2's is red basic identical.As shown in Figure 1.
When we are decided to be 4 milliseconds to non-sweep time, although the redness of discovery COM1 and COM2's is red basic identical, because non-sweep time is oversize, cause the pressing time of liquid crystal too short, if driving voltage does not raise, color can be thin out.
Embodiment 4
See also Fig. 2, Fig. 2 is that the present invention is in the just aobvious drive waveforms principle schematic of the B waveform that uses 1/3 dutycycle to drive.The present embodiment has adopted the HTN type liquid crystal display of just aobvious mode, and bias voltage is 1/3, and the OFF response time of liquid crystal is 3 milliseconds.It adopts the LED-backlit source of three kinds of different colours (R, G, B), drives with 1/3 dutycycle, and actual COM number is 3; Each COM all is sequentially scanned 2 times and positive-negative polarity reverses once in same.Frame frequency is 50Hz.The virtual voltage that liquid crystal pixel applies in non-sweep time is OFF voltage, and backlight continues to light.
It is red that we allow all liquid crystal pixels show, when we are transferred to non-sweep time 4 milliseconds process from 0 millisecond, and when finding that non-sweep time is between 1 millisecond to 4 milliseconds, COM1 in the same picture, the red difference of COM2 and COM3 is less.And if satisfy the sweep time of each COM greater than the ON response time of liquid crystal, we are conducive to the scanning times of same interior COM to improve greater than 2 times words the purity of display color.
Embodiment 5
See also Fig. 3, Fig. 3 is that the present invention is in the just aobvious drive waveforms principle schematic of the B waveform that uses 1/2 dutycycle to drive.The present embodiment has adopted the TN type liquid crystal display of just aobvious mode, and the OFF response time of liquid crystal is 3 milliseconds.It adopts the LED-backlit source of 2 kinds of different colours (redness and cyan), drives with 1/2 dutycycle, and actual COM number is 2; Each COM all is sequentially scanned 2 times in same, and positive-negative polarity also reverses once.COM scanning sequency in the field of each self-corresponding same color (cyan) of 2 adjacent frames is opposite.Frame frequency is 60 to 80Hz.Be 2 to 3 milliseconds non-sweep time, and the virtual voltage that liquid crystal pixel applies in non-sweep time is 0 voltage, and backlight continues to light.
It is red that we allow all liquid crystal pixels show, red complete and homogeneous when we find that be 3 milliseconds non-sweep time.Non-sweep time is when being 2 milliseconds, be shorter than 3 milliseconds of OFF response times of liquid crystal, but because the COM scanning sequency in the field of 2 adjacent each self-corresponding same color of frame is opposite, so that COM1 and COM2's is red basic identical, but when frame per second was lower than 70 Hz, picture can glimmer.When we bring up to 70 Hz to frame per second when above, glimmer controlled.
Embodiment 6
See also Fig. 4, Fig. 4 is that the present invention is in the just aobvious drive waveforms principle schematic of the B waveform that uses 1/3 dutycycle to drive.The present embodiment has adopted the TN type liquid crystal display of just aobvious mode, and the OFF response time of liquid crystal is 3 milliseconds.It adopts the backlight of three kinds of different colours (R, G, B), drives with 1/3 dutycycle, and actual COM number is 3; Each COM is all by forward with oppositely respectively scan 1 time in same, and positive-negative polarity also reverses once.Frame per second is 50 to 80Hz.Be 2 to 3 milliseconds non-sweep time, and the virtual voltage that liquid crystal pixel applies in non-sweep time is OFF voltage, and backlight continues to light.
It is red that we allow all liquid crystal pixels show, red complete and homogeneous when we find that be 3 milliseconds non-sweep time.Non-sweep time, the OFF response time that is shorter than liquid crystal was 3 milliseconds when being 2 milliseconds, but since in same each COM all by forward with oppositely respectively scan 1 time so that COM1, COM2, COM3's is red basic identical, only has fine difference.
Embodiment 7
See also Fig. 5, Fig. 5 is that the present invention is in the just aobvious drive waveforms principle schematic of the B waveform that uses 1/2 dutycycle to drive.The present embodiment has adopted the HTN type liquid crystal display of just aobvious mode, and bias voltage is 1/2, and the OFF response time of liquid crystal is 3.5 milliseconds.It adopts the LED-backlit source of three kinds of different colours (R, G, B), drives with 1/2 dutycycle, and actual COM number is 2; Each COM is all by forward with oppositely respectively scan 1 time in same, and positive-negative polarity also reverses once.COM scanning sequency in the field of 2 adjacent each self-corresponding same color of frame is opposite.Frame frequency is 60 to 80Hz, the schematic diagram when being 60 Hz state shown in the figure.Be 2.5 to 3.5 milliseconds non-sweep time, and the virtual voltage that liquid crystal pixel applies in non-sweep time is 0 voltage, and backlight continues to light.
It is red that we allow all liquid crystal pixels show, red complete and homogeneous when we find that be 3.5 milliseconds non-sweep time.Non-sweep time is when being 2.5 milliseconds, the OFF response time that is shorter than liquid crystal is 3.5 milliseconds, but because the COM scanning sequency in the field of 2 adjacent each self-corresponding same color of frame is opposite, so that COM1 and COM2's is red basic identical, and because each COM is all by forward with oppositely respectively scan 1 time in same, the minimum frequency that does not glimmer that makes drops to 56 Hz.So the condition that the present embodiment adopts is best among the present invention.
Embodiment 8
See also Fig. 6, Fig. 6 is that the present invention is in the just aobvious drive waveforms principle schematic of the B waveform that uses 1/3 dutycycle to drive.The present embodiment has adopted the STN type liquid crystal display of just aobvious mode, and bias voltage is 1/3, and the OFF response time of liquid crystal is 4 milliseconds.It adopts the LED-backlit source of three kinds of different colours (R, G, B), drives with 1/3 dutycycle, and actual COM number is 3; Each COM is all by forward with oppositely respectively scan 1 time in same, and positive-negative polarity also reverses once.COM scanning sequency in the field of 2 adjacent each self-corresponding same color of frame is opposite.Frame frequency is 60 to 80Hz, the schematic diagram when being 60 Hz state shown in the figure.Be 3 milliseconds in non-sweep time, the virtual voltage that liquid crystal pixel applies in non-sweep time is 0 voltage, and backlight continues to light.
We find that the result is similar to embodiment 7.
Embodiment 9
See also Fig. 7, Fig. 7 is that the present invention is in the negative aobvious drive waveforms principle schematic of the A waveform that uses 1/2 dutycycle to drive.The present embodiment has adopted the VA type liquid crystal display of negative aobvious mode, and bias voltage is 1/2, and the OFF response time of liquid crystal is 4 milliseconds.It adopts the LED-backlit source of 2 kinds of different colours (red and blue or green), drives with 1/2 dutycycle, and actual COM number is 2; Each COM all is sequentially scanned 2 times and positive-negative polarity reverses once in same.Frame frequency is 60Hz.Be between 0 millisecond to 4 milliseconds in non-sweep time, the virtual voltage that liquid crystal pixel applies in non-sweep time is 0 voltage, and backlight continues to light.
This embodiment result is similar to embodiment 3, also can to a certain degree improve the aberration of COM1 and COM2.
Embodiment 10
See also Fig. 8, Fig. 8 is the just aobvious drive waveforms principle schematic that drives the display with 1/3 dutycycle with the driving ripple of 1/4 dutycycle.The present embodiment is that the just aobvious passive battle array square dynamic driving field-sequential color liquid crystal display of TN type describes.Bias voltage is 1/3, and the OFF response time of liquid crystal is 2 milliseconds.Frame per second is 60Hz, so the time of each is 5.6 milliseconds, be 1.4 milliseconds the sweep time of each COM.As shown in FIG., described passive battle array square dynamic driving field-sequential color liquid crystal display is a display that only has three COM, be COM1, COM2 and COM3, it namely is the display of 1/3 dutycycle,, among the present invention it is driven it with the driver of 1/4 dutycycle, like this, COM1, COM2 and COM3 all are applied in voltage, and the drive waveforms that should drive the COM4 (not shown) in the driver of 1/4 dutycycle is not used, like this, be exactly that last display time interval of 1/4 dutycycle is just by idle, the COM4 display time interval that has been left unused has just consisted of 1.4 milliseconds non-scanning area, therefore, just have sufficiently the time be used for guaranteeing that COM3 is scanned after, the elevated areas of its cyan penetrating light intensity is in the identical cyan zone, like this, just can guarantee the redness of COM1 in the same picture, the redness of COM2, and COM3's is red basic identical.
This kind driving method is the most economical, can directly select the display that drives 2 COM in the driving chip of 1/3 dutycycle; Or drive the display of 3 COM with the driving chip of 1/4 dutycycle; Or drive display of 4 COM etc. with the driving chip of 1/5 dutycycle, by that analogy.In this case, can have also that each COM is set up situation repeatedly non-sweep time by Multiple-Scan in same.Certainly in above-mentioned non-scanning area, we are made as OFF voltage to the voltage between all COM and the SEG.Certainly be preferably 0V.
In the actual production, speed according to the OFF of display liquid crystal response, also can drive with the driving chip of the several rank dutycycles of height the display of more low-level dutycycle, display such as 1/2 dutycycle, can be with 1/4,1/5 dutycycle, even the driving chip of higher level dutycycle drives; For another example, the display of 1/3 dutycycle can be with 1/5,1/6 dutycycle, even the driving chip of higher level dutycycle drives etc.
Embodiment 11
What Fig. 9 disclosed is the negative aobvious field-sequential color liquid crystal display that 3 COM are arranged, and in fact the example with the driver with 1/4 dutycycle drives, has the display of 2 COM, drives with the driver with 1/3 dutycycle; The display that 4 COM are arranged drives with the driver with 1/5 dutycycle, and other type all can reach similar effect by that analogy.
Embodiment 12 (not drawing)
We the basis of embodiment 8 be increased in same in each COM all by forward with oppositely respectively scan 1 time, the interior opposite condition of COM scanning sequency in field of 2 adjacent each self-corresponding same color of frame, the discovery effect is better than embodiment 9.
The arrangement mode of the polarity of wave among the present invention is not limited to cited arrangement mode among above-mentioned each embodiment, the arrangement mode of its polarity of wave can have the various arrangement mode, polarity of wave can reverse by positive-negative polarity in a field, also can reverse between opposite field or consecutive frame.
Above-described embodiment is to be illustrated with the just aobvious related example of B waveform mostly, and in fact, the B waveform is mutually general with the A waveform, and just aobvious and negative showing also is general.
Above-described embodiment greatly mainly with showing that the red liquid crystal pixel is that example describes, shows that the liquid crystal pixel of other colors is applicable too.
Among the upper embodiment, the color of its backlight is that three kinds of primary colours (R, G, B) are illustrated mostly, and in fact, the color among the present invention can be two or more color, and putting in order of its colour can be selected arbitrarily, and the arrangement of color is not limited to the present embodiment.
The initial of COM scanning in above-described embodiment can be initial at any COM, also can finish at any one COM.
Be summed up, the length of the non-sweep time among the present invention is returned to from pressurized state by the liquid crystal in this liquid crystal display that the required time of original state decides, and generally speaking, be for good non-sweep time between the 1-4 millisecond.
Voltage within non-sweep time between all COM and SEG is less than or equal to OFF voltage, is preferably no-voltage.
Among the present invention, the lighting time of described backlight can lag behind the start time of described first COM scanning, the lighting time of this backlight is referred to as backlight and postpones lighting time, and described backlight delay lighting time is preferably in the selection between the 0.5-2.0 millisecond.
Claims (10)
1. the driving method of a dynamic driving field-sequential color liquid crystal display, it is characterized in that: its backlight comprises in the passive matrix dynamic driving field-sequential color liquid crystal display of two kinds of different colours at least, a plurality of consist of a frame, each comprises sweep time and the non-sweep time of COM, the driving of all liquid crystal pixels is to be finished by the process that each COM is scanned in certain sequence within sweep time, refer to that liquid crystal pixels all after finishing sweep time is not driven non-sweep time but time that backlight continues to light, described non-sweep time is between 1 to 10 millisecond.
2. the driving method of dynamic driving field-sequential color liquid crystal display according to claim 1 is characterized in that, described non-sweep time is between 1 to 4 millisecond.
3. the driving method of dynamic driving field-sequential color liquid crystal display according to claim 1 and 2, it is characterized in that, within same sweep time, each described COM all is scanned more than twice or twice, and the scanning sequency between the adjacent twice sweep is opposite.
4. the driving method of dynamic driving field-sequential color liquid crystal display according to claim 1 and 2 is characterized in that, the scanning sequency of the COM in each self-corresponding same color field of two adjacent frames is opposite.
5. the driving method of dynamic driving field-sequential color liquid crystal display according to claim 4, it is characterized in that, within same sweep time, each described COM all is scanned more than twice or twice, and the scanning sequency between the adjacent twice sweep is opposite.
6. the driving method of dynamic driving field-sequential color liquid crystal display according to claim 1 and 2, it is characterized in that, no matter described liquid crystal display is in still negative display mode of positive display mode, the voltage in non-sweep time between all COM and SEG is equal to or less than OFF voltage; Perhaps be the voltage that equals zero.
7. the driving method of dynamic driving field-sequential color liquid crystal display according to claim 1 and 2, it is characterized in that, described passive matrix dynamic driving field-sequential color liquid crystal display is that frame per second is the dynamic driving field-sequential color liquid crystal display between the 45Hz to 80Hz.
8. the driving method of dynamic driving field-sequential color liquid crystal display according to claim 1 and 2, it is characterized in that, the lighting time of described backlight is the start time that lags behind initial COM scanning, and its backlight postpones lighting time between the 0.5-2.0 millisecond.
9. the driving method of dynamic driving field-sequential color liquid crystal display according to claim 1 and 2 is characterized in that, the inverse of the dutycycle of the drive waveforms of described passive matrix dynamic driving field-sequential color liquid crystal display equates with the actual COM number of display.
10. the driving method of dynamic driving field-sequential color liquid crystal display according to claim 1 and 2 is characterized in that, the inverse of the dutycycle of the drive waveforms of described passive matrix dynamic driving field-sequential color liquid crystal display is greater than the actual COM number of display.
Priority Applications (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200910138337 CN101840675B (en) | 2009-03-17 | 2009-04-26 | Driving method of dynamic driving field-sequential color liquid crystal display |
| PCT/CN2010/070389 WO2010097018A1 (en) | 2009-02-27 | 2010-01-27 | Drive method for dynamically driving field sequential color lcd |
| US13/145,793 US8743035B2 (en) | 2009-02-27 | 2010-01-27 | Driving method for dynamically driving a field sequential color liquid crystal display |
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| CN200910106131 | 2009-03-17 | ||
| CN200910106131.7 | 2009-03-17 | ||
| CN 200910138337 CN101840675B (en) | 2009-03-17 | 2009-04-26 | Driving method of dynamic driving field-sequential color liquid crystal display |
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| CN101840675A CN101840675A (en) | 2010-09-22 |
| CN101840675B true CN101840675B (en) | 2013-02-13 |
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Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1094833A (en) * | 1994-02-19 | 1994-11-09 | 旭硝子株式会社 | Display device and a kind of data-signal formation method that is used for this display device |
| US6501454B1 (en) * | 1997-10-22 | 2002-12-31 | Seiko Epson Corporation | Liquid crystal device, driving method therefor, and electronic apparatus using the same |
| CN1690798A (en) * | 2004-04-30 | 2005-11-02 | 鸿扬光电股份有限公司 | Image display structure and method for driving same |
| CN101154355A (en) * | 2006-09-30 | 2008-04-02 | 中华映管股份有限公司 | Display device driving method |
-
2009
- 2009-04-26 CN CN 200910138337 patent/CN101840675B/en not_active Expired - Fee Related
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1094833A (en) * | 1994-02-19 | 1994-11-09 | 旭硝子株式会社 | Display device and a kind of data-signal formation method that is used for this display device |
| US6501454B1 (en) * | 1997-10-22 | 2002-12-31 | Seiko Epson Corporation | Liquid crystal device, driving method therefor, and electronic apparatus using the same |
| CN1690798A (en) * | 2004-04-30 | 2005-11-02 | 鸿扬光电股份有限公司 | Image display structure and method for driving same |
| CN101154355A (en) * | 2006-09-30 | 2008-04-02 | 中华映管股份有限公司 | Display device driving method |
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