CN104658490B - Cholesteric liquid crystal display screen scanning drive method - Google Patents
Cholesteric liquid crystal display screen scanning drive method Download PDFInfo
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- CN104658490B CN104658490B CN201310602852.3A CN201310602852A CN104658490B CN 104658490 B CN104658490 B CN 104658490B CN 201310602852 A CN201310602852 A CN 201310602852A CN 104658490 B CN104658490 B CN 104658490B
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Abstract
The invention discloses a kind of cholesteric liquid crystal display screen scanning drive method, the scanning drive method comprises the following steps：The display image on cholesteric liquid crystal display screen is removed in the form of high voltage pulse signal, full frame cls is realized；All row electrodes to cholesteric liquid crystal display screen in the form of low voltage pulse signal are scanned driving, such as line by line sequentially, backward, segmentation turntable driving sequentially.The present invention can effectively drive cholesteric liquid crystal display screen to carry out image and show, image display effect is good, drive low cost, operating temperature range is wide, the various problems existing for existing FCR, DDS, bilevel waveform scanning drive method are solved, the image-driven of the cholesteric liquid crystal display screen of different resolution is applicable to.
Description
Technical field
The present invention relates to a kind of scanning drive method, espespecially a kind of turntable driving side for being applied to cholesteric liquid crystal display screen
Method.
Background technology
Cholesteric liquid crystal display screen is the one kind in current main flow LCDs, such as Fig. 1, cholesteric liquid crystal display screen one
As include first, second base layer 11,12, be provided with mixed layer 13 between the first base layer 11 and the second base layer 12, this mix
Close layer 13 to be made up of cholesteric liquid crystal and conducting objects (compound with conductive characteristic), the first base layer 11 is towards mixed layer 13
Side be provided with the first conductive electrode layer 14, the second base layer 12 is provided with the second conductive electrode layer towards the side of mixed layer 13
15.Usually, the first conductive electrode layer 14 is made up of multiple strip line electrodes 141 arranged in parallel, and a row electrode 141 is considered as
A line, the second conductive electrode layer 15 is made up of multiple strip row electrodes 151 arranged in parallel, and a row electrode 151 is considered as a row,
Row electrode 141 is mutually orthogonal with row electrode 151, forms pixel-matrix array structure, as shown in Fig. 2 a row electrode and a row electricity
Pole forms a pixel, such as pixel 20 shown in Fig. 2.
At present, the scanning drive method that cholesteric liquid crystal display screen is used substantially has following three kinds：FCR, DDS, two-value ripple
Shape scanning drive method.
FCR scanning drive methods are mainly first whole screen and are driven into dark-state, and driving is then progressively scanned again, make each pixel
Required dark-state (FC states) or on state of (P states) is presented respectively.But, it can be found that FCR scanning drive methods from actual implementation
The amplitude range of the voltage waveform for being used is smaller, this to carry out whole screen in low-voltage mode typically between 10V to 25V
The way of cls can not well eliminate the ghost on display screen.Current producer mostly by the replacement phase carry out plane replacement or
Bore the burnt mode for resetting to weaken ghost phenomena, but effect on driving birds is not good, it is impossible to thoroughly eliminate ghost.
DDS scanning drive methods mainly use dsp chip to realize a kind of method for driving, although the method can be realized
Image shows, but driving method is extremely complex, it is necessary to dsp chip exports at least 5 road voltage waveforms, therefore there is realization simultaneously
The shortcomings of difficult, control sequential complexity, high cost.
Bilevel waveform scanning drive method mainly uses a kind of method that waveform compensation drives.Can be with from actual implementation
It was found that, although the voltage waveform negligible amounts of bilevel waveform scanning drive method output, too big burden will not be carried out to chip belt, but
Just because of voltage waveform combination very little, the bilevel waveform scanning drive method is suitable only for being scanned at normal temperatures driving and shows
Show, be not suitable for being scanned driving to cholesteric liquid crystal display screen in wide temperature range, there is significant limitation.
As can be seen here, go out that a kind of driving voltage waveform is simple, energy consumption is small, driving is difficult for cholesteric liquid crystal design of LED
Small, the inexpensive scanning drive method of degree is current urgent problem.
The content of the invention
It is an object of the invention to provide a kind of cholesteric liquid crystal display screen scanning drive method, the scanning drive method
Can effectively drive cholesteric liquid crystal display screen to carry out image to show, image display effect is good, drive low cost, operating temperature range
Width, is applicable to the image-driven of the cholesteric liquid crystal display screen of different resolution.
To achieve these goals, present invention employs following technical scheme：
A kind of cholesteric liquid crystal display screen scanning drive method, the scanning drive method shows for cholesteric liquid crystal
Screen, the cholesteric liquid crystal display screen includes first, second base layer, is provided with mixed between first base layer and second base layer
Layer is closed, the mixed layer is made up of cholesteric liquid crystal and conducting objects, first base layer is provided with the towards the side of the mixed layer
One conductive electrode layer, second base layer is provided with the second conductive electrode layer towards the side of the mixed layer, first conductive electrode
Layer is made up of multiple row electrodes arranged in parallel, and second conductive electrode layer is made up of multiple row electrodes arranged in parallel, the row
Electrode is mutually orthogonal with the row electrode and form pixel-matrix array structure, it is characterised in that the scanning drive method includes following step
Suddenly：
Step one：Remove the display image on the cholesteric liquid crystal display screen：It is the unidirectional height of V1 by a pair of voltage magnitudes
Pressure pulse signal is applied separately on all row electrodes, all row electrodes, this pair of one-way high-pressure pulse signal only opposite in phase, its
In, the voltage magnitude V1 of the one-way high-pressure pulse signal is more than on state of threshold voltage VC；
Step 2：All row electrodes to the cholesteric liquid crystal display screen are scanned driving, wherein, turntable driving is each
Individual row electrode comprises the following steps：
Apply row scanning pulse signal to the row electrode of turntable driving, to other row electrode applied voltages of not turntable driving
Amplitude is the d. c. voltage signal of V3, and to being needed on the row electrode of turntable driving, the corresponding row of the pixel for being driven to dark-state are electric
Pole applies dark-state column scan pulse signal, and the pixel on state of when needing to keep initial on the row electrode of turntable driving is corresponding
Row electrode applies on state of column scan pulse signal, wherein：The row scanning pulse signal is that voltage magnitude is the one-way low pressure arteries and veins of V2
Signal is rushed, the dark-state column scan pulse signal and the row scanning pulse signal only opposite in phase, the on state of column scan pulse signal
Identical with the row scanning pulse signal, the voltage magnitude V2 of the one-way low pressure pulse signal turns dark-state threshold V T H more than bright
And less than on state of threshold voltage VC, voltage magnitude V2 >=voltage magnitude V3, voltage magnitude V2-V3, voltage magnitude V3 are respectively less than
This is bright to turn dark-state threshold V T H.
In the step one, in units of row electrode, all row electrodes are divided into multiple regions, regional is distinguished
Emptied, wherein, empty each region and comprise the following steps：It is the one-way high-pressure pulse signal of V1 by voltage magnitude
It is applied on all row electrodes, applies on all row electrodes in this to be emptied region with the one-way high-pressure pulse signal only
The voltage signal of opposite in phase, and apply and the one-way high-pressure pulse signal identical on all row electrodes in remaining region
Voltage signal.Or, in the step one, in units of row electrode, all row electrodes are divided into multiple regions, to each area
Domain is emptied respectively, wherein, empty each region and comprise the following steps：It is the one-way high-pressure arteries and veins of V1 by voltage magnitude
Rush signal to be applied on all row electrodes, apply on all row electrodes in this to be emptied region and the one-way high-pressure pulse
The voltage signal of signal only opposite in phase, and apply and the one-way high-pressure pulse signal on all row electrodes in remaining region
Identical voltage signal.
The one-way high-pressure pulse signal is positively or negatively high-voltage pulse signal；The frequency of the one-way high-pressure pulse signal
It more than or equal to 1Hz and less than or equal to 10KHz, voltage magnitude V1 is that, more than or equal to 25V and less than or equal to 50V, loading is described that rate is
The pulse of one-way high-pressure pulse signal is more than or equal to 1 and less than or equal to 200 to number.
The one-way low pressure pulse signal is positively or negatively low voltage pulse signal；The frequency of the one-way low pressure pulse signal
It more than or equal to 100Hz and less than or equal to 20KHz, voltage magnitude V2 is, more than or equal to 12V and less than 25V, to load the list that rate is
It is more than or equal to 1 and less than or equal to 200 to number to the pulse of low voltage pulse signal.
The voltage magnitude V3 of the d. c. voltage signal is more than or equal to 1V and less than or equal to 12V.
The voltage magnitude V2 of the one-way low pressure pulse signal is equal to the voltage magnitude of the d. c. voltage signal of twice
V3, to realize that DC is balanced.
It is an advantage of the invention that：
The present invention can effectively drive cholesteric liquid crystal display screen to carry out image and show, image display effect is good, drive cost
Low, operating temperature range is wide, is applicable to the image-driven of the cholesteric liquid crystal display screen of different resolution.
1st, the present invention solves the afterimage of image of FCR scanning drive methods not easy-clear by way of subregion empties
Problem, while high current when solving the problems, such as full frame emptying.
2nd, compared with DDS scanning drive methods, the present invention has voltage way few, and control sequential is simple, drives low cost
Advantage.
3rd, compared with bilevel waveform scanning drive method, the present invention has broader operating temperature range, is adapted to various
Cholesteric liquid crystal display screen is driven under temperature environment.
4th, by the setting to voltage magnitude V2 and V3, scanning drive method of the present invention can make cholesteric liquid crystal display screen exist
Realize that DC is balanced in image display process.
Brief description of the drawings
Fig. 1 is the composition schematic diagram (cholesteric liquid crystal molecule is in out of order form) of cholesteric liquid crystal display screen.
Fig. 2 is the first and second conductive electrode layer schematic diagrames for being arranged in dot matrix column-shaped anyhow.
Fig. 3 is that scanning drive method of the present invention realizes flow chart.
Fig. 4 is a pair of oscillograms of one-way high-pressure pulse signal of cls stage applying in first embodiment of the invention.
Fig. 5 is the voltage oscillogram applied to a line of turntable driving in first embodiment of the invention.
Fig. 6 is the voltage oscillogram applied to other rows of not turntable driving in first embodiment of the invention.
Fig. 7 is to needing the pixel for being driven to dark-state corresponding in a line of turntable driving in first embodiment of the invention
The applied voltage oscillogram of row.
Fig. 8 is the pixel correspondence on state of when needing to keep initial in a line of turntable driving in first embodiment of the invention
The voltage oscillogram that is applied of row.
Fig. 9 is the voltage oscillogram of formation after two voltage waveform superpositions shown in Fig. 4.
Figure 10 is the voltage oscillogram formed after voltage waveform shown in Fig. 5 is superimposed with voltage waveform shown in Fig. 7.
Figure 11 is the voltage oscillogram formed after voltage waveform shown in Fig. 5 is superimposed with voltage waveform shown in Fig. 8.
Figure 12 is the voltage oscillogram formed after voltage waveform shown in Fig. 6 is superimposed with voltage waveform shown in Fig. 7.
Figure 13 is the voltage oscillogram formed after voltage waveform shown in Fig. 6 is superimposed with voltage waveform shown in Fig. 8.
Figure 14 is schematic diagram of the cholesteric liquid crystal molecule in conformation of rules.
Specific embodiment
Scanning drive method of the present invention is applied to cholesteric liquid crystal display screen, and such as Fig. 1 and Fig. 2, the cholesteric liquid crystal shows
Screen includes first, second base layer 11,12, and mixed layer 13 is provided between first base layer 11 and second base layer 12,
(not shown in figure, band is conductive by cholesteric liquid crystal (microcosmic lower for cholesteric liquid crystal molecule 131) and conducting objects for the mixed layer 13
The compound of characteristic) composition, first base layer 11 is provided with the first conductive electrode layer 14 towards the side of the mixed layer 13, and this
Two base layers 12 are provided with the second conductive electrode layer 15 towards the side of the mixed layer 13, usually, first conductive electrode layer 14
Be made up of multiple strip line electrodes 141 arranged in parallel, a row electrode 141 is considered as a line, second conductive electrode layer 15 by
Multiple strip row electrodes 151 arranged in parallel are constituted, and a row electrode 151 is considered as a row, the row electrode 141 and the row electrode
151 is mutually orthogonal, forms pixel-matrix array structure, as shown in Fig. 2 a row electrode and a row electrode form a pixel,
Pixel 20 for example shown in Fig. 2.Herein it should be noted that cholesteric liquid crystal display screen is electronical display known in the art
Equipment, therefore its specific composition is not described in detail herein.
Such as Fig. 3, scanning drive method of the present invention comprises the following steps：
Step one：The cls stage, that is, the display image on the cholesteric liquid crystal display screen is removed, specially：By a pair of electricity
Pressure amplitude value is applied separately to all row electrodes 141, all row electrodes 151 for the one-way high-pressure pulse signal (as shown in Figure 4) of V1
On, this pair of one-way high-pressure pulse signal only opposite in phase (frequency 1/T1, voltage magnitude V1, pulse are to number all same), wherein,
The voltage magnitude V1 of the one-way high-pressure pulse signal is more than on state of threshold voltage VC；
Step 2：Turntable driving stage, i.e. all row electrodes 141 to the cholesteric liquid crystal display screen are scanned drive
It is dynamic, wherein, turntable driving each row electrode 141 comprises the following steps：
Apply row scanning pulse signal to the row electrode 141 of turntable driving, applied to other row electrodes 141 of not turntable driving
Making alive amplitude is the d. c. voltage signal (as shown in Figure 6) of V3, to needing to be driven on the row electrode 141 of turntable driving secretly
The corresponding row electrode 151 of the pixel of state applies dark-state column scan pulse signal, to needing to protect on the row electrode 141 of turntable driving
The corresponding row electrode 151 of the pixel of on state of applies on state of column scan pulse signal when holding initial, wherein：The row scanning impulse is believed
Number for voltage magnitude be the one-way low pressure pulse signal (as shown in Figure 5) of V2, the scanning of the dark-state column scan pulse signal and the row
Pulse signal only opposite in phase (frequency 1/T2, voltage magnitude V2, pulse are as shown in Figure 7 to number all same), on state of row are swept
Retouch pulse signal it is identical with the row scanning pulse signal (i.e. frequency 1/T2, voltage magnitude V2, phase, pulse to number all same,
As shown in Figure 8), the voltage magnitude V2 of the one-way low pressure pulse signal turns dark-state threshold V T H and less than the on state of more than bright
Threshold voltage VC, voltage magnitude V2 >=voltage magnitude V3, voltage magnitude V2-V3, voltage magnitude V3 are respectively less than this and bright turn dark-state threshold
Threshold voltage VTH.
In sum, after cls, after having carried out turntable driving to a line, driving is just scanned to next line, until
All rows of display screen are scanned have been driven.After the completion of all row turntable drivings, image refreshing is completed, and image just shows
Come.
The order that all row electrodes of display screen are scanned with driving can be set by actual demand, for example, can be for line by line
Sequential scanning driving, backward turntable driving, fractional scanning driving, Bisection Algorithms turntable driving or random disorder turntable driving etc..
On state of threshold voltage VC is to be driven cholesteric liquid crystal molecule 131 in high pressure range, turns its arrangement form
It is changed into the magnitude of voltage of conformation of rules (being changed on state of), it is composition and thickness according to mixed layer 13 determines, generally
More than 25V.The bright dark-state threshold V T H that turns is in low pressure range, to be driven cholesteric liquid crystal molecule 131, arranges it
Form is changed into the magnitude of voltage of out of order form (being changed into dark-state from state of) from conformation of rules, and it is also the group according to mixed layer 13
Into determining with thickness, generally more than 12V.
In the present invention, V1 ＞ 0, V2 ＞ 0, V3 ＞ 0, VC ＞ 0, VTH ＞ 0.
In the present invention, high pressure refers to voltage of the voltage magnitude between 25V to 50V, and low pressure refers to voltage magnitude in 1V
Voltage between 25V (not including 25V).In the present invention, high frequency refers to frequency of the frequency between 1KHz to 20KHz, low
Frequency refers to frequency of the frequency between 1Hz to 1000Hz, and all voltage signals applied in the present invention do not have low-and high-frequency to limit.
In actual design, to reduce the Transient Currents of cls stage generation, in step one, can be by full frame by row point
Into some regions, the turntable driving stage is entered back into after being emptied respectively to each region, specially：In step one, to arrange
Electrode is unit, and all row electrodes 151 are divided into multiple regions, and regional is emptied respectively, wherein, empty each
Region comprises the following steps：
By voltage magnitude for the one-way high-pressure pulse signal of V1 is applied on all row electrodes 141, this to be emptied region
(frequency, voltage magnitude, pulse are to individual with the one-way high-pressure pulse signal only opposite in phase for applying on interior all row electrodes 151
Number all sames) voltage signal, and apply on all row electrodes 151 in remaining region identical with the one-way high-pressure pulse signal
The voltage signal of (i.e. frequency, voltage magnitude, phase, pulse are to number all same).
Or, to reduce the Transient Currents of cls stage generation, in step one, can also be divided into some by row by full frame
Region, enters back into the turntable driving stage, specially after being emptied respectively to each region：In step one, it is with row electrode
All row electrodes 141 are divided into multiple regions by unit, and regional is emptied respectively, wherein, empty each region bag
Include following steps：
By voltage magnitude for the one-way high-pressure pulse signal of V1 is applied on all row electrodes 151, this to be emptied region
(frequency, voltage magnitude, pulse are to individual with the one-way high-pressure pulse signal only opposite in phase for applying on interior all row electrodes 141
Number all sames) voltage signal, and apply on all row electrodes 141 in remaining region identical with the one-way high-pressure pulse signal
The voltage signal of (i.e. frequency, voltage magnitude, phase, pulse are to number all same).
It can be found that above two cls mode not only solves the big electricity of transient state of cls stage generation from actual implementation
Flow problem, also solves the problem of afterimage of image not easy-clear.
In actual design, the one-way high-pressure pulse signal can be positively or negatively high-voltage pulse signal, and Fig. 4 is illustrated that
Positive high-voltage pulse signal.The frequency of the one-way high-pressure pulse signal can be high frequency or low frequency, and the span of frequency 1/T1 is
More than or equal to 1Hz and less than or equal to 10KHz, and the span of the voltage magnitude V1 of the one-way high-pressure pulse signal be more than etc.
In 25V and less than or equal to 50V, the pulse for loading the one-way high-pressure pulse signal is more than or equal to 1 to the span of number
And less than or equal to 200.For example, frequency 1/T1 can be 1Hz, 1kHz, 10kHz, 100Hz, voltage magnitude V1 can for 25V, 28V,
32V, 50V, pulse can be 1,100,200 to number.
In actual design, the one-way low pressure pulse signal can be positively or negatively low voltage pulse signal, and Fig. 5 is illustrated that
Positive low voltage pulse signal.The frequency of the one-way low pressure pulse signal can be high frequency or low frequency, and the span of frequency 1/T2 is
More than or equal to 100Hz and less than or equal to 20KHz, and the span of the voltage magnitude V2 of the one-way low pressure pulse signal be more than
Equal to 12V and less than 25V, the pulse for loading the one-way low pressure pulse signal be to the span of number more than or equal to 1 and
Less than or equal to 200.For example, frequency 1/T2 can be 100Hz, 4kHz, 18kHz, 20kHz, voltage magnitude V2 can for 12V, 16V,
22V, 24.5V, pulse can be 1,150,200 to number.
In actual design, the voltage magnitude V3 of d. c. voltage signal is more than or equal to 1V and less than or equal to 12V.For example,
Voltage magnitude V3 can be 1V, 6V, 10V, 12V.
As schemed, operation principle of the invention and process are：
First, cls is carried out to cholesteric liquid crystal display screen.Apply frequency to all row electrodes 141, all row electrodes 151
The positive high-voltage pulse signal (such as Fig. 4) that 1/T1 is 50Hz, voltage magnitude is 30V, applies on the row electrode 151 and row electrode 141
Plus pulse signal only opposite in phase.The voltage signal of formation is after being superimposed between the two due to row electrode 141, row electrode 151
Bidirectional pulse and per flashy voltage magnitude be 30V (such as Fig. 9), more than on state of threshold voltage VC (for example on state of threshold value electricity
Pressure VC is chosen to be 25V), therefore, after voltage is acted on, the cholesteric liquid crystal molecule in mixed layer 13 corresponding to all pixels point
131 is in the conformation of rules perpendicular with the plane of first, second conductive electrode layer 14,15, as shown in figure 14, the conformation of rules pair
The visible ray of specific waveforms can produce Bragg reflection, thus on state of (P states) is externally presented.Need exist for explanation, cls
The voltage signal in stage is high voltage, and high voltage signal can well be wiped the ghost on piece image.
Then, sequential scanning line by line is carried out line by line to cholesteric liquid crystal display screen to drive, until all rows are swept
Retouch and driven, at this time, it may be necessary to the image of display is just showed.
Illustrated by taking turntable driving a line as an example below.
Apply the positive action of low-voltage pulse that frequency 1/T2 is 1KHz, voltage magnitude is 20V to the row electrode 141 of turntable driving to believe
Number (such as Fig. 5), is the d. c. voltage signal (such as Fig. 6) of 10V to other applied voltage amplitudes of row electrode 141 of not turntable driving,
Apply to be driven with to scanning to the corresponding row electrode 151 of the pixel for being driven to dark-state is needed on the row electrode 141 of turntable driving
The voltage signal (such as Fig. 7) of the voltage signal only opposite in phase applied on dynamic row electrode 141, to the row electrode of turntable driving
The corresponding row electrode 151 of the pixel of on state of applies to apply with the row electrode 141 to turntable driving when needing to keep initial on 141
Voltage signal identical voltage signal (such as Fig. 8).
Therefore, for needing to be driven to the pixel of dark-state on the row electrode 141 of turntable driving, these pixels are superimposed upon
Voltage waveform on point for bidirectional pulse and is being 20V (such as Figure 10) per flashy voltage magnitude, and dark-state threshold value is turned more than bright
Voltage VTH and less than on state of threshold voltage VC (such as the bright dark-state threshold V T H that turns is chosen to be 14V), therefore, when voltage effect
Afterwards, the cholesteric liquid crystal molecule 131 in the part of mixed layer 13 corresponding to these pixels is changed into disordered chain state, i.e., out of order
Form, as shown in figure 1, the out of order form can not produce Bragg reflection to the visible ray of specific waveforms, thus is externally presented dark
State (FC states).
For needing to be retained as the pixel of on state of on the row electrode 141 of turntable driving, it is superimposed upon on these pixels
Voltage waveform be 0, turn dark-state threshold V T H less than bright, as shown in figure 11, therefore, the mixing corresponding to these pixels
The arrangement form of the cholesteric liquid crystal molecule 131 in 13 part of layer keeps constant, still can carry out Bragg reflection, thus right
It is outer that on state of (P states) is still presented.
Other row electrodes 141 and the row electrode 151 for applying dark-state column scan pulse signal for not turntable driving are constituted
Pixel, although the voltage waveform being superimposed upon on these pixels be bidirectional pulse, the voltage magnitude of the voltage waveform |
V2-V3 | it is 10V, | V3 | is 10V, it is respectively less than bright to turn dark-state threshold V T H, as shown in figure 12, therefore, these pixel institutes
The arrangement form of the cholesteric liquid crystal molecule 131 in the part of corresponding mixed layer 13 keeps constant, and these pixels continue to keep
State originally.
Other row electrodes 141 and the row electrode 151 for applying on state of column scan pulse signal for not turntable driving are constituted
Pixel, although the voltage waveform being superimposed upon on these pixels be bidirectional pulse, the voltage magnitude of the voltage waveform |
V2-V3 | it is 10V, | V3 | is 10V, it is also respectively less than bright to turn dark-state threshold V T H, as shown in figure 13, therefore, these pixels
The arrangement form of the cholesteric liquid crystal molecule 131 in the corresponding part of mixed layer 13 also keeps constant, and these pixels continue
Keep original state.
When actually implementing, the voltage magnitude V2 of one-way low pressure pulse signal and the voltage magnitude of d. c. voltage signal can be made
V3 follows following relational expression：The voltage magnitude V2 of one-way low pressure pulse signal is equal to the voltage magnitude of the d. c. voltage signal of twice
V3, i.e. V2=2V3, so that in the turntable driving stage, the voltage integrating meter on each pixel is 0, it is achieved thereby that DC is flat
Weighing apparatus.And in the present invention, in the cls stage, the voltage integrating meter on each pixel is 0 naturally, therefore, it is clear in the present invention
The screen stage itself just maintains DC balances.
It is an advantage of the invention that：
The present invention can effectively drive cholesteric liquid crystal display screen to carry out image and show, image display effect is good, drive cost
Low, operating temperature range is wide, is applicable to the image-driven of the cholesteric liquid crystal display screen of different resolution.
The above is presently preferred embodiments of the present invention and its know-why used, for those skilled in the art
For, without departing from the spirit and scope of the present invention, it is any based on technical solution of the present invention on the basis of equivalent change
Change, simply replacement etc. obviously changes, belong within the scope of the present invention.
Claims (5)
1. a kind of cholesteric liquid crystal display screen scanning drive method, the scanning drive method is used for cholesteric liquid crystal display screen,
The cholesteric liquid crystal display screen includes first, second base layer, is provided between first base layer and second base layer and mixed
Layer, the mixed layer is made up of cholesteric liquid crystal and conducting objects, and first base layer is provided with first towards the side of the mixed layer
Conductive electrode layer, second base layer is provided with the second conductive electrode layer towards the side of the mixed layer, first conductive electrode layer
It is made up of multiple row electrodes arranged in parallel, second conductive electrode layer is made up of multiple row electrodes arranged in parallel, row electricity
Pole is mutually orthogonal with the row electrode and forms pixel-matrix array structure, it is characterised in that the scanning drive method comprises the following steps：
Step one：Remove the display image on the cholesteric liquid crystal display screen：It is the one-way high-pressure arteries and veins of V1 by a pair of voltage magnitudes
Rush signal to be applied separately on all row electrodes, all row electrodes, this pair of one-way high-pressure pulse signal only opposite in phase, wherein,
The voltage magnitude V1 of the one-way high-pressure pulse signal is more than on state of threshold voltage VC；
Step 2：All row electrodes to the cholesteric liquid crystal display screen are scanned driving, wherein, turntable driving each row
Electrode comprises the following steps：
Apply row scanning pulse signal to the row electrode of turntable driving, to other row electrode applied voltage amplitudes of not turntable driving
It is the d. c. voltage signal of V3, is applied to the corresponding row electrode of the pixel for being driven to dark-state is needed on the row electrode of turntable driving
Plus dark-state column scan pulse signal, to the corresponding row electricity of the pixel of on state of when needing to keep initial on the row electrode of turntable driving
Pole applies on state of column scan pulse signal, wherein：The row scanning pulse signal is voltage magnitude for the one-way low pressure pulse of V2 is believed
Number, the dark-state column scan pulse signal and the row scanning pulse signal only opposite in phase, the on state of column scan pulse signal with should
Row scanning pulse signal is identical, and the voltage magnitude V2 of the one-way low pressure pulse signal is more than the bright dark-state threshold V T H and small of turning
In on state of threshold voltage VC, voltage magnitude V2 >=voltage magnitude V3, voltage magnitude V2-V3, that voltage magnitude V3 is respectively less than this is bright
Turn dark-state threshold V T H, the voltage magnitude V2 of the one-way low pressure pulse signal is equal to the electricity of the d. c. voltage signal of twice
Pressure amplitude value V3；
Wherein：
The frequency of the one-way high-pressure pulse signal be more than or equal to 1Hz and less than or equal to 10KHz, voltage magnitude V1 be more than or equal to
25V and less than or equal to 50V, the pulse for loading the one-way high-pressure pulse signal is more than or equal to 1 and less than or equal to 200 to number
It is individual；
The frequency of the one-way low pressure pulse signal be more than or equal to 100Hz and less than or equal to 20KHz, voltage magnitude V2 be more than etc.
In 12V and less than 25V, the pulse for loading the one-way low pressure pulse signal is more than or equal to 1 and less than or equal to 200 to number
It is individual；
The voltage magnitude V3 of the d. c. voltage signal is more than or equal to 1V and less than or equal to 12V.
2. scanning drive method as claimed in claim 1, it is characterised in that：
In the step one, in units of row electrode, all row electrodes are divided into multiple regions, regional is carried out respectively
Empty, wherein, empty each region and comprise the following steps：By voltage magnitude for the one-way high-pressure pulse signal of V1 applies
Onto all row electrodes, apply on all row electrodes in this to be emptied region and the one-way high-pressure pulse signal only phase
Opposite voltage signal, and apply and the one-way high-pressure pulse signal identical voltage on all row electrodes in remaining region
Signal.
3. scanning drive method as claimed in claim 1, it is characterised in that：
In the step one, in units of row electrode, all row electrodes are divided into multiple regions, regional is carried out respectively
Empty, wherein, empty each region and comprise the following steps：By voltage magnitude for the one-way high-pressure pulse signal of V1 applies
Onto all row electrodes, apply on all row electrodes in this to be emptied region and the one-way high-pressure pulse signal only phase
Opposite voltage signal, and apply and the one-way high-pressure pulse signal identical voltage on all row electrodes in remaining region
Signal.
4. the scanning drive method as described in claim 1 or 2 or 3, it is characterised in that：
The one-way high-pressure pulse signal is positively or negatively high-voltage pulse signal.
5. the scanning drive method as described in claim 1 or 2 or 3, it is characterised in that：
The one-way low pressure pulse signal is positively or negatively low voltage pulse signal.
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| CN201310602852.3A CN104658490B (en) | 2013-11-25 | 2013-11-25 | Cholesteric liquid crystal display screen scanning drive method |
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| CN101840086A (en) * | 2009-07-21 | 2010-09-22 | 苏州汉朗光电有限公司 | Method for getting rid of smectic state LCD image traces |
| CN102402033A (en) * | 2010-09-16 | 2012-04-04 | 苏州汉朗光电有限公司 | Column region correction scanning drive method for smectic liquid crystal display screen |
| CN102890916A (en) * | 2011-07-18 | 2013-01-23 | 财团法人工业技术研究院 | Driving method for multiple steady state display |
| JP2013205673A (en) * | 2012-03-29 | 2013-10-07 | Fujitsu Ltd | Cholesteric liquid crystal display device and display method thereof |
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| CN101840086A (en) * | 2009-07-21 | 2010-09-22 | 苏州汉朗光电有限公司 | Method for getting rid of smectic state LCD image traces |
| CN102402033A (en) * | 2010-09-16 | 2012-04-04 | 苏州汉朗光电有限公司 | Column region correction scanning drive method for smectic liquid crystal display screen |
| CN102890916A (en) * | 2011-07-18 | 2013-01-23 | 财团法人工业技术研究院 | Driving method for multiple steady state display |
| JP2013205673A (en) * | 2012-03-29 | 2013-10-07 | Fujitsu Ltd | Cholesteric liquid crystal display device and display method thereof |
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