CN101989409A - Drive method of dynamic drive field sequential color liquid crystal display - Google Patents
Drive method of dynamic drive field sequential color liquid crystal display Download PDFInfo
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Abstract
The invention relates to a drive method of a dynamic drive field sequential color liquid crystal display (LCD). In the passive matrix dynamic drive field sequential color LCD of which backlight at least contains two or more colors, a plurality of fields constitute a frame; each field contains the scanning time and non-scanning time of COM and the closing time of the backlight; all the liquid crystal pixels are driven through the sequential scanning process of each COM in the scanning time; the non-scanning time refers to the time that all the liquid crystal pixels are not driven while the backlight is still turned on, after the scanning time; the closing time of the backlight refers to the time that all the liquid crystal pixels are not driven and the backlight is turned off, after the non-scanning time; and the sum of the non-scanning time and the closing time of the backlight is not less than 1 millisecond and not more than 10 milliseconds. By using the method of the invention, the purity and contrast of color can be increased while the display colors of all the liquid crystal pixels in each field are consistent relatively. Therefore, the display effect of the passive matrix dynamic drive field sequential color LCD can be increased.
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, switches those pictures (field) then at a high speed in turn and constitutes 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 promptly three fields constitute 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 promptly 2 fields or 4 fields constitute a frame period, and all the other situations are analogized.The driving method of LCD mainly divides driven with active matrix and passive matrix (or simple matrix) to drive two big 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 backlight and LCDs respectively.The driving method of this dynamic driving field-sequential color liquid crystal display, Fig. 7 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 import identical red drive waveforms respectively 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 influences the color homogeneous mainly is an elevated areas (i.e. figure bend part, 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, though the redness of COM1 has 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 with COM2's.When showing other colors certainly 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 8, when we import identical color drive waveforms respectively from COM1 and COM2, during for example 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 light leak amount of every kind of color of COM1 and COM2 different, cause final show red different, so just make 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.
At the problems referred to above, the applicant has proposed a denomination of invention in first forward direction Patent Office of the People's Republic of China and has been " driving method of dynamic driving field-sequential color liquid crystal display ", number of patent application is " 200910138337.8 ", the applying date is " on April 26th, 2009 ", this application is used in dynamic driving field-sequential color liquid crystal display after sweep time, the method that increases non-sweep time is improved the quality of the Show Color of this display, promptly keep " Show Color basically identical and the raising colour purity of the liquid crystal pixel of all COM in same ", an embodiment of this method as shown in Figure 9, the dotted portion among Fig. 9 is the light leak amount.What adopt is the TN type LCD that is just showing 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.After sweep time, be provided with non-sweep time, the virtual voltage that liquid crystal pixel is applied in non-sweep time is zero volt voltage, and backlight continues to light, and test to 4 milliseconds with being 0 millisecond non-sweep time, as long as the liquid crystal pixel light leak amount that satisfies between two COM is equal substantially, just can reach the Show Color basically identical requirement in same.Particular content in Fig. 9 and other this application sees also my above-mentioned relevant patented claim formerly, repeats no more here.
Find after deliberation, though at dynamic driving field-sequential color liquid crystal display after sweep time, the method that increases non-sweep time can be improved the homogeneity of the Show Color of this display, but, also there is certain defective in dynamic driving field-sequential color liquid crystal display aspect the purity that shows contrast and color, remains further to be improved.Reason is when the OFF response time of liquid crystal pixel is long, need lengthening corresponding non-sweep time, because liquid crystal pixel is not driven and backlight continues to open in non-sweep time, making needs pent liquid crystal pixel effectively not close when just showing mode originally, and the light leak of long period is arranged, cause the color of whole picture too light, contrast is bad.Certainly negative apparent mode also has similar problem.
Summary of the invention
The present invention seeks to overcome above-mentioned defective, if provide a kind of drive waveforms identical, in the Show Color basically identical of the liquid crystal pixel that keeps all COM in same, can also further increase color contrast of display degree and the further driving method that improves the passive battle array square dynamic driving field-sequential color liquid crystal display of colour purity.
The key of method described in the present invention is after non-sweep time, increases a backlight again and closes the lamp time, is used for further increasing the color contrast of display degree of display and further improves colour purity.
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 constitute a frame, each comprises the sweep time of COM, non-sweep time and backlight close the lamp time, the driving of all liquid crystal pixels is to be finished by the process that each COM is scanned in certain sequence in sweep time, be meant that finishing all liquid crystal pixels in back in sweep time is not driven that (promptly all liquid crystal pixels are applied in voltage and are less than or equal to OFF voltage non-sweep time, or be zero volt voltage, down with) but time that backlight continues to light, described backlight closes the lamp time and is meant that finishing all liquid crystal pixels in back in non-sweep time is not driven that (promptly all liquid crystal pixels are applied in voltage and are less than or equal to OFF voltage, or be zero volt voltage, down with) but backlight closes the time of lamp, described non-sweep time and backlight close closing more than or equal to 1 millisecond to smaller or equal between 10 milliseconds of lamp time.
Described non-sweep time and backlight close closing more preferably greater than equaling 1 millisecond to smaller or equal between 5 milliseconds of lamp time.
Need to prove passive battle array square for the Active Phased Array square, 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.Make the liquid crystal pixel that is in the terminal COM of scanning equally with the liquid crystal pixel of other COM in same, not finish the process that is returned to non-pressurised state from pressurized state.So the length that we need regulate non-sweep time according to the liquid crystal OFF response time in this LCD, so that total light leak amount of all liquid crystal pixels (total being defined in the embodiment described later of light leak amount is illustrated in conjunction with Figure 10) basically identical in each.
But when the OFF response time of liquid crystal pixel is long, need lengthening corresponding non-sweep time, because liquid crystal pixel is not driven and backlight continues to open in non-sweep time, making needs pent liquid crystal pixel effectively not close when just showing mode originally, and the light leak of long period is arranged, cause the color of whole picture too light, contrast is bad.Certainly negative apparent mode also has similar problem.In order to improve the problems referred to above, we have increased a backlight again and have closed the lamp time after non-sweep time, described backlight closes the lamp time and is meant in non-sweep time and finishes that all liquid crystal pixels in back are not driven but backlight closes the time of lamp, too light by regulating the color that length that this backlight closes the lamp time improves picture, the shortcoming that contrast is bad.Experimental results show that this method is effective.
Backlight closes the lamp time and preferably is less than or equal to the length of non-sweep time.If the oversize length that might shorten non-sweep time too much causes the color of picture inhomogeneous.
But be to shorten non-sweep time slightly also might make originally the evenly slight color problem of non-uniform of picture displayed appearance, so in order to solve this slight color problem of non-uniform, we adopted in same sweep time, each described COM is scanned more than twice or twice, and the scanning sequency between the twice adjacent scanning is opposite, perhaps, in back to back two frames, with the backlight of same color in corresponding sweep time, the driving method that the scanning sequency of each described COM is opposite is improved.
Place after sweep time described non-sweep time, and described backlight closes the lamp time and places after non-sweep time.
Described passive battle array square dynamic driving field-sequential color liquid crystal display is no matter be in the still negative display mode of positive display mode, non-sweep time and backlight close lamp in the time voltage between all COM and SEG be less than or equal to OFF voltage, be preferably zero volt voltage.OFF voltage is the voltage that liquid crystal pixel is added by seal when non-the selection.Though 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, influence display effect.So we preferably can reduce non-sweep time and backlight and close the voltage between COM and SEG in the lamp time, are preferably the volt voltage that equals zero as far as possible.Here need to prove, though closing COM and the voltage between SEG of lamp in the time at non-sweep time and backlight can be zero volt voltage, but 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 promptly 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 backlight and LCDs respectively.
The lighting time of described backlight is the start time that lags behind described initial COM scanning, its backlight postpone lighting time more than or equal to 0.5 millisecond to smaller or equal between 2 milliseconds.
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 adopted each COM in same all to be scanned, in each except the sweep time and non-sweep time of COM, after non-sweep time, also increase backlight and closed the lamp time, like this, the Show Color that can make all liquid crystal pixels in each has increased the purity and the contrast of color in the case of relatively consistent.Improved the display effect of passive battle array square dynamic driving field-sequential color liquid crystal display.
Description of drawings
Fig. 1 is the drive waveforms principle schematic (double-colored backlight) that the present invention is just showing at the B waveform that uses 1/2 dutycycle to drive.
Fig. 2 is the drive waveforms principle schematic (three look backlights) that the present invention is just showing at the B waveform that uses 1/2 dutycycle to drive.
Fig. 3 waveform principle schematic of the field scan reversed in order of same color in tight adjacent two frames that to be the present invention just showing at the B waveform that uses 1/2 dutycycle to drive.
Fig. 4 is the waveform principle schematic same interscan reversed in order that the present invention is just showing at 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 showing 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 showing 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 existing dynamic driving field-sequential color liquid crystal display A waveform is just showing the drive waveforms synoptic diagram.
Fig. 8 is the negative drive waveforms synoptic diagram that shows of existing dynamic driving field-sequential color liquid crystal display A waveform.
Fig. 9 is the just apparent drive waveforms principle schematic of B waveform of using 1/2 dutycycle to drive in the previous application.
Figure 10 is the defined declaration synoptic diagram (double-colored backlight) of the total light leak amount of drive waveforms that just showing of B waveform that 1/2 dutycycle of Fig. 1 drives.
Embodiment
Among the embodiment among the present invention, the major part that is given 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, as the display of four kinds of different colours or five kinds of different colours or the like.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 the bottom or the sidepiece of LCDs, and described backlight driver and LCDs driver drive the structure of backlight and LCDs respectively.It also can be the LCD that to select suitable bias voltage.LCD among the present invention can be positive and negative respectively each driving of each COM in each LCD once.LCD 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 do example by most of B waveform that adopts in this explanation.Certainly the A waveform of not giving an example and other practical waveforms are suitable for too.
Described backlight postpones lighting time and is preferably in more than or equal to millisecond O.5 to smaller or equal to the selection between 2 milliseconds.
Before specifically describing following each embodiment, for the ease of the explanation of following each embodiment, we introduce a notion with Figure 10 earlier, i.e. the notion of total light leak amount.
See also Figure 10, Figure 10 and Fig. 1 are basic identical, differently be for the notion of total light leak amount is described, the OFF voltage light leak amount among the figure represents partly that with oblique line ON voltage light leak amount is partly represented with the inclined shaft font among the figure.Among the figure, the pairing OFF voltage of COM1 light leak amount and ON voltage light leak amount sum are the total light leak amount of COM1; The pairing OFF voltage of COM2 light leak amount and ON voltage light leak amount sum are the total light leak amount of COM2.
Present embodiment has adopted the TN type LCD that just shows mode, and bias voltage is 1/2, and the OFF response time of liquid crystal is 10 milliseconds.It adopts the LED-backlit source of 2 kinds of different colours (redness, cyan), drives with 1/2 dutycycle, and actual COM number is 2; Each COM in same is all scanned 2 times in order and positive-negative polarity reverses once.Frame frequency is 45Hz.It is zero volt voltage that non-sweep time and backlight close the virtual voltage that liquid crystal pixel is applied in the lamp time, and the waveform separately of COM and SEG also can be that waveform combination by positive-negative polarity forms certainly.Shown in the schematic diagram of Fig. 1 (for clear display, Fig. 1 is not by the real time ratio drawing):
In an embodiment, be 1.1 milliseconds sweep time, and be 7 milliseconds non-sweep time, and it is 3 milliseconds that backlight closes the lamp time.It is red that we allow the liquid crystal pixel of COM1 and COM2 show, at this moment we find, the lack of homogeneity of redness shown in Figure 1 is not provided with the red homogeneity that backlight closes the embodiment of lamp during the time under the same terms; But red contrast and purity are better than under the same terms, and contrast and purity that backlight closes the embodiment of lamp during the time are not set.This be because, embodiment illustrated in fig. 1 in owing to non-sweep time after, be provided with backlight and close the lamp time, reduced the total light leak amount of the liquid crystal pixel that need close, red contrast and the purity of just having improved like this; But, because closing the lamp time, backlight exists, among Fig. 1 COM2 backlight close the OFF voltage light leak amount decrease of lamp in the time less than Fig. 1 in the decrease of OFF voltage light leak amount of COM1 (black triangle among Fig. 1 part is the part that differs of both total light leak amounts, the dotted line grid is the light leak amount in the backlight shut-in time among the figure), therefore, formed the total light leak amount of total light leak amount of COM2, so the red homogeneity between its COM is variant slightly greater than COM1.But, if being closed the lamp time, backlight is controlled in the proper range, still can find an equilibrium point, and contrast and purity is color preferably all.As shown in Figure 1 among the embodiment,, backlight remains in the proper range if being closed the lamp time, the homogeneity that it is red, and contrast and purity are all better, or acceptable.
Similarly, adopt above-mentioned identical condition, we have also carried out following test.
When we are decided to be 7: 3 to the ratio that non-sweep time and backlight close the lamp time, progressively reduce non-sweep time and backlight and close lamp time sum, adopting both sums respectively is 9 milliseconds, 8 milliseconds, 7 milliseconds, 6 milliseconds, 5 milliseconds, 4 milliseconds, 3 milliseconds, 2 milliseconds, 1 millisecond, test, found that when both sums shorten, the driving voltage step-down of liquid crystal pixel, the color of picture becomes bright-coloured, but the difference of the redness of the redness of COM1 and COM2 can increase.Need us suitably to adjust the time of both sums according to the situation of reality.
On the other hand, when we are fixed on appropriate location (from 1 to 10 millisecond) to the time of the two sum, adjust the ratio that non-sweep time and backlight close the lamp time, we find when ratio between two is 9: 1, the purity effect of color is better than 10: 0, when ratio between two continues to be changed to 8: 2,7: 3,6: 4,5: 5 o'clock, the purity of finding color progressively becomes better, but picture is deepening gradually, and the homogeneity of color is variation progressively, the words that continue to diminish when ratio between two, the discovery display effect is relatively poor, not too is fit to use.
In the present embodiment, we are except using the TN field-sequential color liquid crystal display, various experiments have been done, we also use STN, HTN, OCB, the field-sequential color liquid crystal display of the non-bistable state dynamic driving of VA class has been done experiment, STN in the above-mentioned experiment, HTN, the OCB field-sequential color liquid crystal display adopts positive display mode, the field-sequential color liquid crystal display of the non-bistable state dynamic driving of VA class adopts negative display mode, experimental results show that, no matter adopt which kind of field-sequential color liquid crystal display, and no matter be the field-sequential color liquid crystal display that adopts positive negative mode, the above-mentioned similar effects of the equal tool of field-sequential color liquid crystal display of still negative display mode.
Present embodiment has adopted the TN type LCD that just shows 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.Closing the lamp virtual voltage that liquid crystal pixel applied in the time at non-sweep time and backlight is zero volt voltage.Non-sweep time and backlight close the lamp time be combined into 1 millisecond to 5 milliseconds variable.(for clear display, Fig. 2 is not by the real time ratio drawing):
In an embodiment, be 2.6 milliseconds sweep time, and be 2 milliseconds non-sweep time, and it is 1 millisecond that backlight closes the lamp time.It is red that we allow the liquid crystal pixel of COM1 and COM2 show, at this moment we find, the homogeneity of redness embodiment illustrated in fig. 2 is worse than red homogeneity embodiment illustrated in fig. 9 slightly; But red contrast and purity are better than embodiment illustrated in fig. 9.Its reason embodiment as shown in Figure 1 is described the same.
Similarly, adopt above-mentioned identical condition, we have also carried out following test.
When we are decided to be 2: 1 to the ratio that non-sweep time and backlight close the lamp time, progressively reduce non-sweep time and backlight and close lamp time sum, adopting both sums respectively is 5 milliseconds, 4 milliseconds, and 3 milliseconds, 2 milliseconds, 1 millisecond, test, found that when both sums shorten, the color of liquid crystal pixel becomes bright-coloured, but the difference of the redness of the redness of COM1 and COM2 can increase.Need us suitably to adjust the time of both sums according to the situation of reality.
On the other hand, when we are fixed on appropriate location (from 1 to 5 millisecond) to the time of the two sum, adjust the ratio that non-sweep time and backlight close the lamp time, we find when ratio between two is 4: 1, the purity effect of color is better than 5: 0, when ratio between two continues to be changed to 3: 2, and 1: 1 o'clock, the purity of finding color progressively becomes better, but picture is deepening gradually, and the homogeneity of color is variation progressively, the words that continue to diminish when ratio between two, the discovery display effect is relatively poor, not too is fit to use.
Because the present invention is after non-sweep time, increase backlight and closed the lamp time, if right and wrong sweep times is more than or equal to the OFF response time of liquid crystal, then, close the lamp time followed by backlight again, can guarantee the homogeneity of liquid crystal display picture color like this, it is good that comparative and purity continue to open than backlight.But, in the practical application,, make and also will be forced to non-sweep time prolong if the OFF response time is longer, can cause total light leak amount too many like this, the purity variation of color, contrast diminishes.So we can make the OFF response time of non-sweep time less than liquid crystal, then, close the lamp time followed by backlight again, so can to increase the purity of color, certainly can cause also that the homogeneity of color has small difference between the COM, in order to address this problem, we can take following method, the one, each COM all is sequentially scanned 2 times in same, and positive-negative polarity also reverses once, and the interior COM scanning sequency in the field of 2 adjacent each self-corresponding same color of frame is opposite; The 2nd, each COM all is sequentially scanned 1 time in same, and positive-negative polarity also reverses once, and the interior COM scanning sequency in the field of every each self-corresponding same color of frame is opposite in same; The 3rd, each COM all is sequentially scanned 1 time in same, and positive-negative polarity also reverses once, and not only the COM scanning sequency in the field of every each self-corresponding same color of frame is opposite in same, and the COM scanning sequency in the field of 2 adjacent each self-corresponding same color of frame is opposite.In the time of can realizing non-scanning like this and backlight close closing of lamp time and be unlikely to very long, but homogeneity, contrast and the purity that can guarantee the display display color are all in a scope that can receive.Below in conjunction with accompanying drawing to the explanation respectively in addition of above-mentioned three kinds of situations.
Example 3 sees also Fig. 3, and Fig. 3 is the drive waveforms principle schematic that the present invention is just showing at the B waveform that uses 1/2 dutycycle to drive.Present embodiment has adopted the TN type LCD that just shows 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 40 to 80Hz.Be 1 to 5 millisecond non-sweep time, backlight close the lamp time be 0 millisecond variable to 5 milliseconds, non-sweep time and backlight close 1 millisecond to the 5 milliseconds variation that is combined into of lamp time, and closing the lamp virtual voltage that liquid crystal pixel applied in the time at non-sweep time and backlight is zero volt voltage.
Embodiment illustrated in fig. 3 is that each COM all is sequentially scanned 2 times in same, and positive-negative polarity also reverses once, the opposite situation of COM scanning sequency in the field of 2 adjacent each self-corresponding same color of frame, from figure as can be known, because the COM scanning sequency in the field of 2 adjacent each self-corresponding same color of frame is opposite, though like this because backlight closes the existence of lamp time, make that total light leak amount of COM1 and COM2 is unequal, but because the redness of COM1 and COM2 is compensated in second frame immediately, therefore, the homogeneity of display display color can not be subjected to too much influence.Can reach practical effect.
Example 4 sees also Fig. 4, and Fig. 4 is the drive waveforms principle schematic that the present invention is just showing at the B waveform that uses 1/3 dutycycle to drive.Present embodiment has adopted the TN type LCD that just shows 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, backlight close the lamp time be 0 millisecond variable to 3 milliseconds, non-sweep time and backlight close 2 milliseconds to the 3 milliseconds variations that are combined into of lamp time, and it is OFF voltage that non-sweep time and backlight close the virtual voltage that liquid crystal pixel is applied in the lamp time.
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, and it is 1 millisecond that backlight closes the lamp time, but since in same each COM make COM1 all by forward with oppositely respectively scan 1 time, COM2, COM3's is red basic identical.
Example 5 sees also Fig. 5, and Fig. 5 is the drive waveforms principle schematic that the present invention is just showing at the B waveform that uses 1/2 dutycycle to drive.Present embodiment has adopted the TN type LCD that just shows 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, and non-sweep time and backlight close 1 millisecond to the 5 milliseconds variation that is combined into of lamp time, and it is zero volt voltage that non-sweep time and backlight close the virtual voltage that liquid crystal pixel is applied in the lamp time.
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, it is 1 millisecond that backlight closes the lamp time, but because the COM scanning sequency in the field of adjacent 2 each self-corresponding same color of frame is opposite, makes that COM1 and COM2's is red basic identical.
Example 6 sees also Fig. 6, and Fig. 6 is the drive waveforms principle schematic that the present invention is just showing at the B waveform that uses 1/3 dutycycle to drive.Present embodiment has adopted the TN type LCD that just shows 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 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 60Hz, and be 3 milliseconds non-sweep time, backlight close the lamp time be 0 millisecond to 4 milliseconds variable, non-sweep time and backlight close 0 millisecond to the 4 milliseconds variation that is combined into of lamp time, the virtual voltage that liquid crystal pixel is applied in non-sweep time is zero volt voltage.
We find that the result is similar to result embodiment illustrated in fig. 5.
Example 7, the drive waveforms that the present invention is just showing at the B waveform that uses 1/16 dutycycle to drive (not drawing).Adopted the HTN type LCD that just shows mode, bias voltage is 1/5, 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 1/16 dutycycle, and actual COM number is 16; 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 60Hz, non-sweep time be 1 millisecond to 4 milliseconds variable, backlight close the lamp time be 0 millisecond to 4 milliseconds variable, it is zero volt voltage that non-sweep time and backlight close the virtual voltage that liquid crystal pixel is applied in the lamp time.
We find that the result is similar to embodiment 5.If we are being set at 2 milliseconds non-sweep time, it is 1.5 milliseconds that backlight closes the lamp time, and backlight postpones lighting time (lighting time of backlight lags behind the start time of described first COM scanning), and above-mentioned LCD can show the dot matrix coloured image of 16X128 picture number well when being 0.8 millisecond.And color is even, and purity might as well.
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 battle array square dynamic driving field-sequential color liquid crystal display of two or more different colours at least, a plurality of constitute a frame, each comprises the sweep time of COM, non-sweep time and backlight close the lamp time, the driving of all liquid crystal pixels is to be finished by the process that each COM is scanned in certain sequence in sweep time, be meant non-sweep time in sweep time and finish that all liquid crystal pixels in back are not driven but time that backlight continues to light, described backlight closes the lamp time and is meant in non-sweep time and finishes that all liquid crystal pixels in back are not driven but backlight closes the time of lamp, described non-sweep time and backlight close lamp time sum more than or equal to 1 millisecond between smaller or equal to 10 milliseconds.
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 and backlight close lamp time sum more than or equal to 1 millisecond between smaller or equal to 5 milliseconds.
3. the driving method of dynamic driving field-sequential color liquid crystal display according to claim 1 and 2 is characterized in that, described backlight closes the lamp time and is less than or equal to non-sweep time.
4. the driving method of dynamic driving field-sequential color liquid crystal display according to claim 1 and 2, it is characterized in that, in same sweep time, each described COM all is scanned more than twice or twice, and the scanning sequency between the twice adjacent scanning is opposite.
5. 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.
6. the driving method of dynamic driving field-sequential color liquid crystal display according to claim 5, it is characterized in that, in same sweep time, each described COM all is scanned more than twice or twice, and the scanning sequency between the twice adjacent scanning is opposite.
7. 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 LCD is in the still negative display mode of positive display mode, non-sweep time and backlight close lamp in the time voltage between all COM and SEG be equal to or less than OFF voltage; Volt voltage perhaps equals zero.
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 described initial COM scanning, its backlight postpone lighting time more than or equal to 0.5 millisecond between smaller or equal to 2 milliseconds.
9. 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 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.
10. the driving method of dynamic driving field-sequential color liquid crystal display according to claim 1 and 2, it is characterized in that, described LCD is TN, STN, HTN, OCB, any in the non-bistable state dynamic driving field-sequential color liquid crystal display of VA class.
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| Application Number | Priority Date | Filing Date | Title |
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| CN2009101090786A CN101989409A (en) | 2009-07-31 | 2009-07-31 | Drive method of dynamic drive 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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| CN2009101090786A CN101989409A (en) | 2009-07-31 | 2009-07-31 | Drive method of dynamic drive field sequential color liquid crystal display |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111326119A (en) * | 2020-04-03 | 2020-06-23 | 京东方科技集团股份有限公司 | Driving method of backlight module, field sequence display device and VR equipment |
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| US6154190A (en) * | 1995-02-17 | 2000-11-28 | Kent State University | Dynamic drive methods and apparatus for a bistable liquid crystal display |
| JP2003140114A (en) * | 2001-11-02 | 2003-05-14 | Zenic Inc | Driver for cholesteric liquid crystal display |
| CN201278068Y (en) * | 2008-09-18 | 2009-07-22 | 陈国平 | Field sequential color liquid crystal display |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| US6154190A (en) * | 1995-02-17 | 2000-11-28 | Kent State University | Dynamic drive methods and apparatus for a bistable liquid crystal display |
| JP2003140114A (en) * | 2001-11-02 | 2003-05-14 | Zenic Inc | Driver for cholesteric liquid crystal display |
| CN201278068Y (en) * | 2008-09-18 | 2009-07-22 | 陈国平 | Field sequential color liquid crystal display |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN111326119A (en) * | 2020-04-03 | 2020-06-23 | 京东方科技集团股份有限公司 | Driving method of backlight module, field sequence display device and VR equipment |
| CN111326119B (en) * | 2020-04-03 | 2021-08-27 | 京东方科技集团股份有限公司 | Driving method of backlight module in field sequential display device and field sequential display device |
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Application publication date: 20110323 |