CN105448251B - A kind of frequency amplitude variation driving method for smectic liquid crystal screen - Google Patents
A kind of frequency amplitude variation driving method for smectic liquid crystal screen Download PDFInfo
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- CN105448251B CN105448251B CN201410746619.7A CN201410746619A CN105448251B CN 105448251 B CN105448251 B CN 105448251B CN 201410746619 A CN201410746619 A CN 201410746619A CN 105448251 B CN105448251 B CN 105448251B
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Abstract
The invention discloses a kind of frequency amplitude variation driving methods for smectic liquid crystal screen, this method passes through to loading the voltage magnitude of a pair of of row, column pulse signal on two conductive electrode layers of smectic liquid crystal screen and/or the design of frequency, to make smectic liquid crystal screen display show that piece image, display speed are fast and low in energy consumption.Wherein, the frequency of n pulse group of line-pulse signal is changed in a manner of incrementally increasing and reducing again, voltage magnitude by gradually reduce again it is increased in a manner of change, frequency is identical between row pulse signal and line-pulse signal, pulse is identical to number, opposite in phase, voltage magnitude are identical or different, and the voltage magnitude of n pulse group of row pulse signal be also by gradually reduce again it is increased in a manner of change.
Description
Technical field
The present invention relates to a kind of driving methods for smectic liquid crystal screen, espespecially a kind of to be applied to by smectic liquid crystal system
At display screen, quick, the low-power drive method realized by adjusting frequency and voltage.
Background technology
Currently, smectic liquid crystal screen all there has been prodigious application demand in fields such as building, automobile, electronics.Smectic phase
Liquid crystal display is mainly to be in by electric signal control liquid crystal molecule with the additives mixed of conductive characteristic using smectic liquid crystal
Reveal different ordered states and screen is made integrally to switch between misty shading and all-transparent state, or even in different shade of gray
Switch between a variety of progressive states, and state when this screen can remain powered-up under power-down state, i.e., multistable step response.
For above-mentioned smectic liquid crystal screen, conventional drive method is mainly the voltage letter for controlling and being applied on conductive electrode layer
Number voltage magnitude, frequency and pulse to number, under these three parameter collective effects, make the liquid crystal display all-transparent with it is misty
It is switched between shading status, generally, applies high frequency (>=1000Hz) high voltage driving pulses to carrying out null clear operation to present
All-transparent state applies low frequency (≤100Hz) high voltage driving pulses to carrying out sanding operation misty shading status is presented.But
It is that for the driving of null clear operation or sanding operation, conventional ADS driving mode is fixed and voltage frequency using voltage magnitude
Rate fixes the signal driving side of (being a certain frequency in high frequency when null clear operation, be a certain frequency in low frequency when sanding operation)
Formula, therefore in order to reach the display effect of desire phase, often result in the appearance for the problems such as driving time is long, driving power consumption is excessive.
It can be seen that designing a kind of driving side for reducing driving time, reducing driving power consumption to smectic liquid crystal screen
Method is current problem to be solved.
Invention content
The purpose of the present invention is to provide a kind of frequency amplitude variation driving method for smectic liquid crystal screen, this method passes through
The mode of variation voltage magnitude and/or frequency realizes the purpose accelerated picture display rate, reduce driving power consumption.
To achieve the goals above, present invention employs following technical schemes：
A kind of frequency amplitude variation driving method for smectic liquid crystal screen, the smectic liquid crystal screen include two base layers,
Mixed layer is equipped among two base layers, which is formed by smectic liquid crystal and additives mixed, in each matrix
Layer is equipped with conductive electrode layer towards the mixed layer side, and two conductive electrode layers are connect with circuit drives control device, special
Sign is that the frequency amplitude variation driving method includes step：
The smectic liquid crystal screen display is set to show that a pair of of row, column pulse signal of piece image is loaded into two conductions respectively
On electrode layer, wherein：
The line-pulse signal is made of n pulse group, each pulse group by least one identical pulse to constituting, the n
The frequency and/or voltage magnitude of each pulse group in a pulse group are changed by following rules：Frequency is by keeping smectic liquid crystal fast
The acceleration frequency that fast activity is got up incrementally increases maintain the base frequency that normally deflects of smectic liquid crystal after gradually reduce again to
Frequency is terminated, so that smectic liquid crystal quickly deflects into required state；Voltage magnitude is by making smectic liquid crystal Fast Activities
Acceleration row amplitude be gradually decreased to be incrementally increased again to termination row after maintaining the basic row amplitude that normally deflects of smectic liquid crystal
Amplitude, so that smectic liquid crystal quickly deflects into required state；
The row pulse signal is made of n pulse group, each pulse group by least one identical pulse to constituting, the n
A pulse group is corresponded with n pulse group in the line-pulse signal, a pulse group in the row pulse signal and the row
Frequency is identical between a corresponding pulse group in pulse signal, pulse is identical to number, opposite in phase, voltage magnitude are identical
Or it is different, the voltage magnitude of each pulse group in the n pulse group of the row pulse signal is changed by following rules：Voltage amplitude
Value is by making the acceleration row amplitude that smectic liquid crystal Fast Activities are got up be gradually decreased to the base that maintenance smectic liquid crystal normally deflects
It is incrementally increased again to end column amplitude after plinth row amplitude, so that smectic liquid crystal quickly deflects into required state.
The row pulse signal, the line-pulse signal voltage magnitude be respectively less than threshold voltage magnitude, the row pulse
Signal, the line-pulse signal voltage magnitude superposition after obtained voltage magnitude be more than threshold voltage magnitude.
When making the smectic liquid crystal deflect into regularly arranged state, then the row pulse signal, the row pulse is believed
Number frequency be in the high-frequency range of 1KHz to 10KHz, for the acceleration frequency close to 1KHz, the base frequency is close
10KHz；
When making the smectic liquid crystal deflect into out of order ordered state, then the row pulse signal, the row pulse is believed
Number frequency be in the low-frequency range of 10Hz to 200Hz, for the acceleration frequency close to 10Hz, the base frequency is close
200Hz。
The number of the pulse pair of the row pulse signal, the line-pulse signal is between 5 and 800.
The voltage magnitude that the acceleration row amplitude obtains after being superimposed with the acceleration row amplitude is close but is less than 3 times of threshold value
Voltage magnitude, the voltage magnitude that the basis row amplitude obtains after being superimposed with the basic row amplitude are near but greater than threshold voltage
Amplitude.
The termination frequency is the acceleration frequency, and the termination row amplitude is the acceleration row amplitude, the end column
Amplitude is the acceleration row amplitude.
The termination frequency is less than the acceleration frequency, and the termination row amplitude is more than the acceleration row amplitude, the end
Only row amplitude is more than the acceleration row amplitude, the voltage magnitude that the termination row amplitude obtains after being superimposed with the end column amplitude
Threshold voltage magnitudes close but less than 3 times.
The row pulse signal, the line-pulse signal are two-way positive negative pulse stuffing or unidirectional pulse.
It is an advantage of the invention that：
The present invention makes full use of the drive characteristic of smectic liquid crystal, passes through tune during smectic liquid crystal deflects
The voltage magnitude and/or frequency of the whole row, column pulse signal being applied on conductive electrode layer, to make smectic liquid crystal accelerate to change
Itself deflection state, enables smectic liquid crystal quickly to tend towards stability, and accelerates the refresh rate for showing image, realizes with most
Small energy consumption achievees the purpose that desire phase image display effect, compared with the conventional drive method used by the smectic liquid crystal screen, has
The purpose that driving time can be reduced significantly, substantially reduce driving power consumption.
Description of the drawings
Fig. 1 is the structure composition schematic diagram of the application of the present invention.
Fig. 2 is the first embodiment oscillogram that the present invention is implemented.
Fig. 3 is the second embodiment oscillogram that the present invention is implemented.
Fig. 4 is the 3rd embodiment oscillogram that the present invention is implemented.
Specific implementation mode
Frequency amplitude variation driving method of the present invention is designed for smectic liquid crystal screen.Such as Fig. 1, which includes two
A base layer 11,12 is set among two base layers 11,12 there are one mixed layer 30, and the mixed layer 30 is by smectic liquid crystal
It forms, i.e., is formed by smectic liquid crystal molecule and additive molecular mixing with additives mixed, it is mixed towards this in the base layer 11
The side for closing layer 30 is set there are one conductive electrode layer 21, sets that there are one conductive in the side of base layer 12 towards the mixed layer 30
Electrode layer 22, two conductive electrode layers 21,22 are connect with circuit drives control device (not shown).
Base layer 11,12 can all be glass either in plastics or base layer 11,12 one is glass and another is
Plastics, wherein plastics can be transparent plastic film, transparent hard plastic plate.
Generally, the thickness of mixed layer 30 can be controlled in 2 microns~30 microns, such as 2,5,10,20,30 microns.It is mixing
Layer 30 in, smectic liquid crystal account for mixing total weight 90%~99.999%, additive account for mixing total weight 0.001%~
10%.In general, when between room temperature ± 50 DEG C, the molecule cluster of smectic liquid crystal is layered arrangement structure, shows sticky slurry
Paste.In the present invention, smectic liquid crystal is A class smectic liquid crystal organic compounds, such as compound with silicon substrate, four cyano four
Octyl-biphenyl, tetraacethyl last of the ten Heavenly stems ester four cyano biphenyl etc., additive is the compound with conductive characteristic, such as cetyl triethyl group bromine
Change the compounds containing conductive ion such as ammonium.In addition, can also be mixed with a certain amount of dichroic dye in mixed layer 30.
The conductive electrode layer 21,22 is transparent, such as ITO (tin indium oxide), and can use the gold of auxiliary as needed
Belong to electrode, such as aluminium, copper, silver.According to display pattern or the needs of word, if conductive electrode layer 21,22 may be partitioned into accordingly
Dry unit.For example, two conductive electrode layers 21,22 can be arranged in vertical and horizontal array-like by strip segmentation, and specifically, two conductions
Electrode layer 21,22 is divided into P, Q strip shaped electric poles arranged in parallel, P, Q strip shaped electric poles of two conductive electrode layers respectively
Pixel-matrix array structure that is mutually orthogonal and forming a P × Q (P, Q are positive integer).
Frequency amplitude variation driving method of the present invention includes step：
To make the smectic liquid crystal screen display show a pair of of row, column pulse signal of piece image be loaded into respectively two this lead
On electric electrode layer 21,22, wherein：
The line-pulse signal is made of n (n is the positive integer more than 3) pulse groups, and each pulse group is by least one phase
With pulse to composition (when pulse group by two or more pulses to constituting when, each pulse is to identical), the n pulse group
The frequency and/or voltage magnitude of the after-applied each pulse group of middle elder generation are changed by following rules：Frequency is by keeping smectic liquid crystal fast
The acceleration frequency that fast activity is got up gradually reduces again after incrementally increasing the base frequency that smectic liquid crystal can be maintained normally to deflect
To frequency is terminated, so that smectic liquid crystal quickly deflects into required state；Voltage magnitude is by making smectic liquid crystal Fast Activities
The acceleration row amplitude come is incrementally increased again after being gradually decreased to the basic row amplitude that smectic liquid crystal can be maintained normally to deflect to end
Only row amplitude, so that smectic liquid crystal quickly deflects into required state；
The row pulse signal is made of n pulse group, and each pulse group (works as arteries and veins by least one identical pulse to constituting
Rush group by two or more pulses to constituting when, each pulse is to identical), the n in the n pulse group and the line-pulse signal
A pulse group corresponds, the pulse group pulse group corresponding with the line-pulse signal in the row pulse signal
Between frequency is identical, pulse is identical to number, opposite in phase, voltage magnitude are identical or different, the n arteries and veins of the row pulse signal
The voltage magnitude for rushing first after-applied each pulse group in group is changed by following rules：Voltage magnitude is by keeping smectic liquid crystal quick
The acceleration row amplitude that activity is got up gradually increases again after being gradually decreased to the basic row amplitude that smectic liquid crystal can be maintained normally to deflect
Greatly to end column amplitude, so that smectic liquid crystal quickly deflects into required state.
In the present invention, row pulse signal, line-pulse signal voltage magnitude be respectively less than threshold voltage magnitude, row pulse letter
Number, the voltage magnitude that obtains after the superposition of the voltage magnitude of line-pulse signal be more than threshold voltage magnitude.Preferably, row pulse is believed
Number, the voltage magnitude that obtains after the superposition of the voltage magnitude of line-pulse signal is between threshold voltage magnitude and 3 times of threshold voltage width
Between value.
In actual implementation, preferably, the voltage magnitude obtained after accelerating row amplitude to be superimposed with acceleration row amplitude is close to 3 times
Threshold voltage magnitude but less than 3 times of threshold voltage magnitude, originally load on smectic liquid crystal close to 3 times of threshold voltages
The voltage magnitude of amplitude can make smectic liquid crystal with prestissimo activity, and deflection takes place, and finally load in smectic
Voltage magnitude on phase liquid crystal is then that whole smectic liquid crystals is enable quickly to tend towards stability state.Preferably, basic row amplitude
The voltage magnitude obtained after being superimposed with basic row amplitude is close to threshold voltage magnitude but is more than threshold voltage magnitude, loads at this time
The voltage magnitude close to threshold voltage magnitude on smectic liquid crystal can keep smectic liquid crystal normal can to deflect.
In actual implementation, it is to accelerate row amplitude or termination row amplitude to be more than to accelerate row amplitude that can make termination row amplitude,
End column amplitude is to accelerate row amplitude or end column amplitude to be more than to accelerate row amplitude, just more accelerates smectic phase liquid in this way
Crystalline substance tends towards stability the speed of state.But preferably, the voltage magnitude that termination row amplitude obtains after being superimposed with end column amplitude is answered
The situation for being maintained close to but being less than 3 times of threshold voltage magnitude is preferred.
When smectic liquid crystal to be made deflects into regularly arranged state, even if all-transparent shape is finally presented in smectic liquid crystal screen
State, then row pulse signal, line-pulse signal frequency should be in the high-frequency range of 1KHz to 10KHz, and preferably, accelerate frequency
Rate is close to 1KHz, and base frequency is close to 10KHz.Originally the frequency close to 1KHz loaded on smectic liquid crystal can make smectic phase
Liquid crystal is got up with prestissimo activity, and deflection takes place, and it is then to make whole finally to load the frequency on smectic liquid crystal
Smectic liquid crystal can quickly tend towards stability state.And the frequency close to 10KHz loaded on smectic liquid crystal can keep close
Crystalline phase liquid crystal normal can deflect.
When smectic liquid crystal to be made deflects into out of order ordered state, even if misty shading is finally presented in smectic liquid crystal screen
State, then row pulse signal, line-pulse signal frequency be in the low-frequency range of 10Hz to 200Hz, and preferably, accelerate frequency
Rate is close to 10Hz, and base frequency is close to 200Hz.Originally the frequency close to 10Hz loaded on smectic liquid crystal can make smectic phase
Liquid crystal is got up with prestissimo activity, and deflection takes place, and it is then to make whole finally to load the frequency on smectic liquid crystal
Smectic liquid crystal can quickly tend towards stability state.And the frequency close to 200Hz loaded on smectic liquid crystal can keep close
Crystalline phase liquid crystal normal can deflect.
In actual implementation, it is to accelerate frequency, or terminate frequency and be less than acceleration frequency that can make termination frequency, so just more
Smectic liquid crystal is accelerated to tend towards stability the speed of state.
It in the present invention, can be with using the mode of multi-frequency combination driving during being driven to smectic liquid crystal screen
The activity of smectic liquid crystal molecule is set to reinforce.In multiple voltage combination driving, the high voltage applied first can provide smectic
The starting voltage of phase liquid crystal molecular movement, and the low-voltage applied later provides the holding for maintaining smectic liquid crystal molecular state
Voltage.
In the present invention, row pulse signal, line-pulse signal can be two-way positive negative pulse stuffing or unidirectional pulse, unidirectional arteries and veins
Punching includes direct impulse, negative-going pulse.
In actual implementation, row pulse signal, line-pulse signal the number of pulse pair can be between 5 and 800.
In actual implementation, for row, column pulse signal, there is no limit voltage magnitudes for the amplitude of variation of frequency
Amplitude of variation also there is no limit can be according to the display demand of practical smectic liquid crystal screen, to rationally design amplitude of variation, variation
Number such as can complete frequency from 10Hz to 200Hz again to the change procedure of 10Hz by 5 variations.
In the present invention, threshold voltage magnitude for make smectic liquid crystal molecule by driving occur ordered state change electricity
Pressure value is determined according to the composition of mixed layer 30 and thickness, generally 5V or more.
As shown in Fig. 2, in the embodiment of this invention, when by the driving of smectic phase liquid crystal display in all-transparent state, row, column is all adopted
The type of drive changed with frequency and voltage magnitude, line-pulse signal is referring to waveform above in Fig. 2, and row pulse signal is referring to figure
Waveform below in 2, that is, it is 1KHz, base frequency 9KHz to accelerate frequency, termination frequency, accelerates row amplitude, termination row amplitude
For 80V, basic row amplitude is 10V, and it is 80V to accelerate row amplitude, end column amplitude, and basic row amplitude is 10V.Then with conventional ADS driving
Method is compared, and after applying this row, column pulse signal, driving time reduces about 12%, and driving power consumption reduces about 15%.
As shown in figure 3, in the embodiment of this invention, when the driving of smectic phase liquid crystal display is protected from light state in mist, row uses
The type of drive of frequency and voltage magnitude variation, row are using the type of drive of only frequency variation, and line-pulse signal is referring in Fig. 3
The waveform in face, for row pulse signal referring to waveform following in Fig. 3, that is, it is 100Hz, base frequency 150Hz to accelerate frequency, is terminated
Frequency is 50Hz, and it is 80V to accelerate row amplitude, termination row amplitude, and basic row amplitude is 10V, and the voltage magnitude of row pulse signal begins
40V is remained eventually.Then compared with conventional drive method, after applying this row, column pulse signal, driving time reduces about 7%, driving
Lower power consumption about 17%.
As shown in figure 4, in the embodiment of this invention, when the driving of smectic phase liquid crystal display is protected from light state in mist, row, column is equal
Using voltage magnitude change type of drive, and row, column apply be direct impulse (Fig. 2 and it is illustrated in fig. 3 be two-way positive and negative
Pulse), line-pulse signal referring to the waveform above in Fig. 4, row pulse signal referring to the waveform below in Fig. 4, i.e. frequency always
For 50Hz, it is 80V to accelerate row amplitude, termination row amplitude, and basic row amplitude is 10V, and it is 80V to accelerate row amplitude, end column amplitude,
Basic row amplitude is 10V.Then compared with conventional drive method, after applying this row, column pulse signal, driving time is reduced about
12%, driving power consumption reduces about 32%.
When smectic liquid crystal screen needs to be rendered as all-transparent state, come according to aforementioned present invention method in high-frequency range
Apply row, column pulse signal, so that the smectic liquid crystal molecule in mixed layer 30 is deflected under the drive that conductive material moves, be in
The long optical axis of regularly arranged state, smectic liquid crystal molecule is basically perpendicular to conductive electrode layer plane, incident each smectic liquid crystal
The refraction of the light of molecule does not generate acute variation, and light freely penetrates mixed layer 30, to make smectic liquid crystal screen show
A kind of all-transparent state.
When smectic liquid crystal screen needs to be rendered as mist to be protected from light state, according to aforementioned present invention method in low-frequency range
Apply row, column pulse signal, so that the smectic liquid crystal molecule in mixed layer 30 is deflected under the drive that conductive material moves,
In out of order ordered state, there is very big difference in the refraction of the light of incident each smectic liquid crystal molecule, make in mixed layer 30
Optical index generates acute variation, and strong scattering occurs for light, and shape is protected from light to make smectic liquid crystal screen show a kind of mist
State.
All-transparent state, mist about smectic liquid crystal screen are protected from light the displaying principle of state referring also to Patent No.
200710175959.9 Chinese invention patent " a kind of electric-controlled light-regulating medium ", Patent No. 200810102000.7 middle promulgated by the State Council
Corresponding description in bright patent " electric-controlled light-regulating medium " etc. understands that this will not be detailed here.
The present invention makes full use of the drive characteristic of smectic liquid crystal, passes through tune during smectic liquid crystal deflects
The voltage magnitude and/or frequency of the whole row, column pulse signal being applied on conductive electrode layer, to make smectic liquid crystal accelerate to change
Itself deflection state, enables smectic liquid crystal quickly to tend towards stability, and accelerates the refresh rate for showing image, realizes with most
Small energy consumption achievees the purpose that desire phase image display effect, compared with the conventional drive method used by the smectic liquid crystal screen, has
The purpose that driving time can be reduced significantly, substantially reduce driving power consumption.
The above is presently preferred embodiments of the present invention and its technical principle used, for those skilled in the art
For, without departing from the spirit and scope of the present invention, any equivalent change based on the basis of technical solution of the present invention
Change, simple replacement etc. is obvious changes, all fall within the protection scope of the present invention.
Claims (4)
1. a kind of frequency amplitude variation driving method for smectic liquid crystal screen, which includes two base layers, two
Mixed layer is equipped among a base layer, which is formed by smectic liquid crystal and additives mixed, in each base layer
It is equipped with conductive electrode layer towards the mixed layer side, two conductive electrode layers are connect with circuit drives control device, feature
It is, which includes step：
The smectic liquid crystal screen display is set to show that a pair of of row, column pulse signal of piece image is loaded into two conductive electrodes respectively
On layer, wherein：
The line-pulse signal is made of n pulse group, each pulse group by least one identical pulse to constituting, the n arteries and veins
The frequency and/or voltage magnitude for each pulse group rushed in group are changed by following rules：Frequency is by making smectic liquid crystal quickly live
The acceleration frequency moved up is gradually reduced again after incrementally increasing the base frequency for maintaining smectic liquid crystal normally to deflect to termination
Frequency, so that smectic liquid crystal quickly deflects into required state；Voltage magnitude by making that smectic liquid crystal Fast Activities get up plus
Fast row amplitude is incrementally increased again after being gradually decreased to the basic row amplitude for maintaining smectic liquid crystal normally to deflect to termination row amplitude,
So that smectic liquid crystal quickly deflects into required state；
The row pulse signal is made of n pulse group, each pulse group by least one identical pulse to constituting, the n arteries and veins
Punching group is corresponded with n pulse group in the line-pulse signal, a pulse group in the row pulse signal and the row pulse
Frequency is identical between a corresponding pulse group in signal, pulse is identical to number, opposite in phase, voltage magnitude are identical or not
Together, the voltage magnitude of each pulse group in the n pulse group of the row pulse signal is changed by following rules：Voltage magnitude by
The basis row for making the acceleration row amplitude that smectic liquid crystal Fast Activities are got up be gradually decreased to that smectic liquid crystal is maintained normally to deflect
It is incrementally increased again to end column amplitude after amplitude, so that smectic liquid crystal quickly deflects into required state；
It terminates frequency and is less than acceleration frequency, termination row amplitude, which is more than, accelerates row amplitude, and end column amplitude, which is more than, accelerates row amplitude.
2. frequency amplitude variation driving method as described in claim 1, it is characterised in that：
The row pulse signal, the line-pulse signal voltage magnitude be respectively less than threshold voltage magnitude, the row pulse signal,
The voltage magnitude obtained after the voltage magnitude superposition of the line-pulse signal is more than threshold voltage magnitude.
3. frequency amplitude variation driving method as described in claim 1, it is characterised in that：
The number of the pulse pair of the row pulse signal, the line-pulse signal is between 5 and 800.
4. frequency amplitude variation driving method as claimed any one in claims 1 to 3, it is characterised in that：
The row pulse signal, the line-pulse signal are two-way positive negative pulse stuffing or unidirectional pulse.
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