CN104658490A - Scanning driving method for cholesteric liquid crystal display screen - Google Patents
Scanning driving method for cholesteric liquid crystal display screen Download PDFInfo
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Abstract
The invention discloses a scanning driving method for a cholesteric liquid crystal display screen. The scanning driving method comprises the following steps: clearing a display image on the cholesteric liquid crystal display screen in the form of high-voltage pulse signals to clear the whole screen; performing scanning driving on all row electrodes of the cholesteric liquid crystal display screen in the form of low-voltage pulse signals in the scanning driving sequences, such as a proper sequence row by row, a reverse sequence, segmenting and the like. According to the scanning driving method for the cholesteric liquid crystal display screen, the cholesteric liquid crystal display screen can be effectively driven to display images; the image display effect is good; the driving cost is low; the working temperature range is wide; various problems in existing FCR, DDS and two-value waveform scanning driving methods are solved; the method can be applicable to the image driving of cholesteric liquid crystal display screens with different definitions.
Description
Technical field
The present invention relates to a kind of scanning drive method, espespecially a kind of scanning drive method being applied to cholesteric liquid crystal display screen.
Background technology
Cholesteric liquid crystal display screen is the one in current main flow LCDs, as Fig. 1, cholesteric liquid crystal display screen generally comprises first, second base layer 11,12, mixolimnion 13 is provided with between the first base layer 11 and the second base layer 12, this mixolimnion 13 is made up of cholesteric liquid crystal and conducting objects (compound of band conductive characteristic), first base layer 11 is provided with the first conductive electrode layer 14, second base layer 12 and is provided with the second conductive electrode layer 15 towards the side of mixolimnion 13 towards the side of mixolimnion 13.Usually, first conductive electrode layer 14 is made up of multiple strip line electrode 141 arranged in parallel, a column electrode 141 is considered as a line, second conductive electrode layer 15 is made up of multiple strip row electrode 151 arranged in parallel, and a row electrode 151 is considered as row, and column electrode 141 is mutually orthogonal with row electrode 151, form pixel-matrix array structure, as shown in Figure 2, a column electrode and a row electrode form a pixel, such as pixel 20 shown in Fig. 2.
At present, the scanning drive method that cholesteric liquid crystal display screen uses roughly has following three kinds: FCR, DDS, bilevel waveform scanning drive method.
FCR scanning drive method mainly first whole screen is driven into dark-state, and then driving of lining by line scan, and makes each pixel present required dark-state (FC state) or on state of (P state) respectively.But can find from reality is implemented, the amplitude range of the voltage waveform that FCR scanning drive method uses is less, generally between 10V to 25V, this way of carrying out whole screen cls in low-voltage mode can not eliminate the ghost on display screen well.Current producer weakens ghost phenomena by the mode of carrying out plane replacement or the burnt replacement of cone in the replacement phase mostly, but poor effect, ghost can not be eliminated up hill and dale.
DDS scanning drive method mainly utilizes dsp chip to realize a kind of method driven, although the method can realize image display, but driving method is very complicated, need dsp chip to export at least 5 road voltage waveforms, therefore existence realization is difficult, Control timing sequence is complicated, high in cost of production shortcoming simultaneously.
A kind of method that bilevel waveform scanning drive method mainly utilizes waveform compensation to drive.Can find from reality is implemented, although the voltage waveform negligible amounts that bilevel waveform scanning drive method exports, too large burden can not be brought to chip, but just because of voltage waveform combination very little, this bilevel waveform scanning drive method is only applicable to carrying out turntable driving display at normal temperatures, be not suitable for carrying out turntable 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 little for cholesteric liquid crystal design of LED, drive difficulty scanning drive method that is little, low cost to be current urgent problem.
Summary of the invention
The object of the present invention is to provide a kind of cholesteric liquid crystal display screen scanning drive method, this scanning drive method can effectively drive cholesteric liquid crystal display screen to carry out image display, image display effect is good, driving cost is low, operating temperature range is wide, 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, this scanning drive method is used for cholesteric liquid crystal display screen, this cholesteric liquid crystal display screen comprises first, second base layer, mixolimnion is provided with between this first base layer and this second base layer, this mixolimnion is made up of cholesteric liquid crystal and conducting objects, this first base layer is provided with the first conductive electrode layer towards the side of this mixolimnion, this second base layer is provided with the second conductive electrode layer towards the side of this mixolimnion, this first conductive electrode layer is made up of multiple column electrode arranged in parallel, this second conductive electrode layer is made up of multiple row electrode arranged in parallel, this column electrode is mutually orthogonal with this row electrode and form pixel-matrix array structure, it is characterized in that, this scanning drive method comprises the steps:
Step one: remove the display image on this cholesteric liquid crystal display screen: be that the one-way high-pressure pulse signal of V1 is applied on all column electrodes, all row electrodes respectively by a pair voltage magnitude, to one-way high-pressure pulse signal, only phase place is contrary for this, wherein, the voltage magnitude V1 of this one-way high-pressure pulse signal is greater than on state of threshold voltage VC;
Step 2: carry out turntable driving to all column electrodes of this cholesteric liquid crystal display screen, wherein, each column electrode of turntable driving comprises the steps:
Column electrode to turntable driving applies line scanning pulse signal, it is the d. c. voltage signal of V3 that other column electrodes to not turntable driving apply voltage magnitude, the row electrode that the pixel needing to be driven to dark-state on this column electrode of turntable driving is corresponding applies dark-state column scan pulse signal, the row electrode that when needing to keep initial on this column electrode of turntable driving, the pixel of on state of is corresponding applies on state of column scan pulse signal, wherein: the one-way low pressure pulse signal of this line scanning pulse signal to be voltage magnitude be V2, only phase place is contrary for this dark-state column scan pulse signal and this line scanning pulse signal, this on state of column scan pulse signal is identical with this line scanning pulse signal, the voltage magnitude V2 of this one-way low pressure pulse signal is greater than and brightly turns dark-state threshold V T H and be less than this on state of threshold voltage VC, voltage magnitude V2 >=voltage magnitude V3, voltage magnitude V2-V3, voltage magnitude V3 is all less than this and brightly turns dark-state threshold V T H.
In described step one, in units of row electrode, all row electrodes are divided into multiple region, regional is emptied respectively, wherein, empty each region and comprise the steps: to be that the described one-way high-pressure pulse signal of V1 is applied on all column electrodes by voltage magnitude, all row electrodes in this region emptied apply and the described one-way high-pressure pulse signal voltage signal that only phase place is contrary, and the voltage signal that on all row electrodes in all the other regions, applying is identical with described one-way high-pressure pulse signal.Or, in described step one, in units of column electrode, all column electrodes are divided into multiple region, regional is emptied respectively, wherein, empty each region and comprise the steps: to be that the described one-way high-pressure pulse signal of V1 is applied on all row electrodes by voltage magnitude, all column electrodes in this region emptied apply and the described one-way high-pressure pulse signal voltage signal that only phase place is contrary, and the voltage signal that on all column electrodes in all the other regions, applying is identical with described one-way high-pressure pulse signal.
Described one-way high-pressure pulse signal is forward or negative sense high-voltage pulse signal; The frequency of described one-way high-pressure pulse signal for being more than or equal to 1Hz and being less than or equal to 10KHz, voltage magnitude V1 for being more than or equal to 25V and being less than or equal to 50V, the pulse loading described one-way high-pressure pulse signal to number for being more than or equal to 1 and being less than or equal to 200.
Described one-way low pressure pulse signal is forward or negative sense low voltage pulse signal; The frequency of described one-way low pressure pulse signal for being more than or equal to 100Hz and being less than or equal to 20KHz, voltage magnitude V2 for being more than or equal to 12V and being less than 25V, the pulse loading described one-way low pressure pulse signal to number for being more than or equal to 1 and being less than or equal to 200.
The voltage magnitude V3 of described d. c. voltage signal is for being more than or equal to 1V and being less than or equal to 12V.
The voltage magnitude V2 of described one-way low pressure pulse signal equals the voltage magnitude V3 of the described d. c. voltage signal of twice, to realize DC balance.
Advantage of the present invention is:
The present invention can effectively drive cholesteric liquid crystal display screen to carry out image display, and image display effect is good, and drive cost low, operating temperature range is wide, is applicable to the image-driven of the cholesteric liquid crystal display screen of different resolution.
1, the mode that emptied by subregion of the present invention, the problem of the afterimage of image solving FCR scanning drive method not easy-clear, solves big current problem during full frame emptying simultaneously.
2, compared with DDS scanning drive method, it is few that the present invention has voltage way, and Control timing sequence is simple, drives the advantage that cost is low.
3, compared with bilevel waveform scanning drive method, the present invention has wider operating temperature range, drives under being adapted at various temperature environment to cholesteric liquid crystal display screen.
4, by the setting to voltage magnitude V2 and V3, scanning drive method of the present invention can make cholesteric liquid crystal display screen in image display process, realize DC balance.
Accompanying drawing explanation
Fig. 1 is the composition schematic diagram (cholesteric liquid crystal molecule is out of order form) of cholesteric liquid crystal display screen.
Fig. 2 is the first and second conductive electrode layer schematic diagram being arranged in dot matrix column-shaped anyhow.
Fig. 3 is the realization flow figure of scanning drive method of the present invention.
Fig. 4 is the oscillogram of a pair one-way high-pressure pulse signal of cls stage applying in first embodiment of the invention.
Fig. 5 is to the voltage oscillogram that a line of turntable driving applies in first embodiment of the invention.
Fig. 6 is to the voltage oscillogram that other row of not turntable driving apply in first embodiment of the invention.
Fig. 7 is the voltage oscillogram that row that the pixel that needs in first embodiment of the invention to be driven to dark-state in a line of turntable driving is corresponding apply.
Fig. 8 is the voltage oscillogram that the pixel of on state of is corresponding when needing to keep initial in first embodiment of the invention in a line of turntable driving row apply.
Fig. 9 is the voltage oscillogram formed after two voltage waveform superpositions shown in Fig. 4.
Figure 10 is the voltage oscillogram formed after voltage waveform shown in voltage waveform with Fig. 7 shown in Fig. 5 superposes.
Figure 11 is the voltage oscillogram formed after voltage waveform shown in voltage waveform with Fig. 8 shown in Fig. 5 superposes.
Figure 12 is the voltage oscillogram formed after voltage waveform shown in voltage waveform with Fig. 7 shown in Fig. 6 superposes.
Figure 13 is the voltage oscillogram formed after voltage waveform shown in voltage waveform with Fig. 8 shown in Fig. 6 superposes.
The schematic diagram of Figure 14 to be cholesteric liquid crystal molecule be conformation of rules.
Embodiment
Scanning drive method of the present invention is applicable to cholesteric liquid crystal display screen, as Fig. 1 and Fig. 2, this cholesteric liquid crystal display screen comprises first, second base layer 11, 12, mixolimnion 13 is provided with between this first base layer 11 and this second base layer 12, this mixolimnion 13 by cholesteric liquid crystal (being cholesteric liquid crystal molecule 1 31 under microcosmic) and conducting objects (not shown, compound with conductive characteristic) composition, this first base layer 11 is provided with the first conductive electrode layer 14 towards the side of this mixolimnion 13, this second base layer 12 is provided with the second conductive electrode layer 15 towards the side of this mixolimnion 13, usually, this first conductive electrode layer 14 is made up of multiple strip line electrode 141 arranged in parallel, a column electrode 141 is considered as a line, this second conductive electrode layer 15 is made up of multiple strip row electrode 151 arranged in parallel, a row electrode 151 is considered as row, this column electrode 141 is mutually orthogonal with this row electrode 151, form pixel-matrix array structure, as shown in Figure 2, a column electrode and a row electrode form a pixel, such as pixel 20 shown in Fig. 2.Here it should be noted that, cholesteric liquid crystal display screen be this area know electronic display unit, therefore it specifically forms and does not here describe in detail.
As Fig. 3, scanning drive method of the present invention comprises the steps:
Step one: cls stage, namely the display image on this cholesteric liquid crystal display screen is removed, be specially: be that the one-way high-pressure pulse signal (as shown in Figure 4) of V1 is applied on all column electrodes 141, all row electrodes 151 respectively by a pair voltage magnitude, this is to one-way high-pressure pulse signal only phase place contrary (frequency 1/T1, voltage magnitude V1, pulse all identical to number), wherein, the voltage magnitude V1 of this one-way high-pressure pulse signal is greater than on state of threshold voltage VC;
Step 2: turntable driving stage, namely carries out turntable driving to all column electrodes 141 of this cholesteric liquid crystal display screen, and wherein, each column electrode 141 of turntable driving comprises the steps:
Column electrode 141 to turntable driving applies line scanning pulse signal, other column electrodes 141 to not turntable driving apply the d. c. voltage signal (as shown in Figure 6) that voltage magnitude is V3, the row electrode 151 that the pixel needing to be driven to dark-state on this column electrode 141 of turntable driving is corresponding applies dark-state column scan pulse signal, the row electrode 151 that when needing to keep initial on this column electrode 141 of turntable driving, the pixel of on state of is corresponding applies on state of column scan pulse signal, wherein: the one-way low pressure pulse signal (as shown in Figure 5) of this line scanning pulse signal to be voltage magnitude be V2, this dark-state column scan pulse signal and this line scanning pulse signal only contrary (frequency 1/T2 of phase place, voltage magnitude V2, pulse is all identical to number, as shown in Figure 7), this on state of column scan pulse signal (i.e. frequency 1/T2 identical with this line scanning pulse signal, voltage magnitude V2, phase place, pulse is all identical to number, as shown in Figure 8), the voltage magnitude V2 of this one-way low pressure pulse signal is greater than and brightly turns dark-state threshold V T H and be less than this on state of threshold voltage VC, voltage magnitude V2 >=voltage magnitude V3, voltage magnitude V2-V3, voltage magnitude V3 is all less than this and brightly turns dark-state threshold V T H.
In sum, after cls, after turntable driving has been carried out to a line, just turntable driving is carried out to next line, until all row of display screen are complete by turntable driving.After all line scannings have driven, image refreshing has completed, and image just shows.
The order of all column electrodes of display screen being carried out to turntable driving can set by actual demand, such as, can be sequential scanning driving line by line, backward turntable driving, fractional scanning driving, Bisection Algorithms turntable driving or random disorder turntable driving etc.
On state of threshold voltage VC for make cholesteric liquid crystal molecule 1 31 be driven in high pressure range, its arrangement form is made to change the magnitude of voltage of conformation of rules (changing on state of into) into, it is determined according to the composition of mixolimnion 13 and thickness, is generally more than 25V.The bright dark-state threshold V T H that turns is in low pressure range, cholesteric liquid crystal molecule 1 31 is driven, its arrangement form is made to change the magnitude of voltage of out of order form (changing dark-state into from state of) into from conformation of rules, it is also determine according to the composition of mixolimnion 13 and thickness, is 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 the voltage of voltage magnitude between 25V to 50V, and low pressure refers to the voltage of voltage magnitude between 1V to 25V (not comprising 25V).In the present invention, high frequency refers to the frequency of frequency between 1KHz to 20KHz, and low frequency refers to the frequency of 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, for reducing the Transient Currents of cls stage generation, in step one, some regions can be divided into full frame by row, after each region is emptied respectively, enter the turntable driving stage again, be specially: in step one, in units of row electrode, all row electrodes 151 are divided into multiple region, regional is emptied respectively, wherein, empty each region to comprise the steps:
Be that the one-way high-pressure pulse signal of V1 is applied on all column electrodes 141 by voltage magnitude, all row electrodes 151 in this region emptied apply the voltage signal with this one-way high-pressure pulse signal only phase place contrary (frequency, voltage magnitude, pulse all identical to number), and the voltage signal of applying identical with this one-way high-pressure pulse signal (i.e. frequency, voltage magnitude, phase place, pulse all identical to number) on all row electrodes 151 in all the other regions.
Or, for reducing the Transient Currents of cls stage generation, in step one, also can be divided into some regions by row by full frame, after each region is emptied respectively, enter the turntable driving stage again, be specially: in step one, in units of column electrode, all column electrodes 141 are divided into multiple region, regional is emptied respectively, wherein, empty each region to comprise the steps:
Be that the one-way high-pressure pulse signal of V1 is applied on all row electrodes 151 by voltage magnitude, all column electrodes 141 in this region emptied apply the voltage signal with this one-way high-pressure pulse signal only phase place contrary (frequency, voltage magnitude, pulse all identical to number), and the voltage signal of applying identical with this one-way high-pressure pulse signal (i.e. frequency, voltage magnitude, phase place, pulse all identical to number) on all column electrodes 141 in all the other regions.
Can find from reality is implemented, above-mentioned two kinds of cls modes not only solve the Transient Currents problem that the cls stage produces, and also solve the problem of afterimage of image not easy-clear.
In actual design, this one-way high-pressure pulse signal can be forward or negative sense high-voltage pulse signal, and shown in Fig. 4 is forward high-voltage pulse signal.The frequency of this one-way high-pressure pulse signal can be high frequency or low frequency, the span of frequency 1/T1 is for being more than or equal to 1Hz and being less than or equal to 10KHz, and the span of the voltage magnitude V1 of this one-way high-pressure pulse signal is for being more than or equal to 25V and being less than or equal to 50V, the pulse loading this one-way high-pressure pulse signal to the span of number for being more than or equal to 1 and being less than or equal to 200.Such as, frequency 1/T1 can be 1Hz, 1kHz, 10kHz, 100Hz, and voltage magnitude V1 can be 25V, 28V, 32V, 50V, and pulse can be 1,100,200 to number.
In actual design, this one-way low pressure pulse signal can be forward or negative sense low voltage pulse signal, and shown in Fig. 5 is forward low voltage pulse signal.The frequency of this one-way low pressure pulse signal can be high frequency or low frequency, the span of frequency 1/T2 is for being more than or equal to 100Hz and being less than or equal to 20KHz, and the span of the voltage magnitude V2 of this one-way low pressure pulse signal is for being more than or equal to 12V and being less than 25V, the pulse loading this one-way low pressure pulse signal to the span of number for being more than or equal to 1 and being less than or equal to 200.Such as, frequency 1/T2 can be 100Hz, 4kHz, 18kHz, 20kHz, and voltage magnitude V2 can be 12V, 16V, 22V, 24.5V, and pulse can be 1,150,200 to number.
In actual design, the voltage magnitude V3 of d. c. voltage signal is for being more than or equal to 1V and being less than or equal to 12V.Such as, voltage magnitude V3 can be 1V, 6V, 10V, 12V.
As figure, principle of work of the present invention and process are:
First, cls is carried out to cholesteric liquid crystal display screen.Apply to all column electrodes 141, all row electrodes 151 the forward high-voltage pulse signal (as Fig. 4) that frequency 1/T1 is 50Hz, voltage magnitude is 30V, only phase place is contrary for this row electrode 151 and the pulse signal that column electrode 141 applies.Due to column electrode 141, the voltage signal formed after row electrode 151 superposes between the two is bidirectional pulse and is 30V (as Fig. 9) at every flashy voltage magnitude, be greater than on state of threshold voltage VC (such as on state of threshold voltage VC is chosen to be 25V), therefore, when after voltage effect, cholesteric liquid crystal molecule 1 31 in mixolimnion 13 corresponding to all pixels is with first, second conductive electrode layer 14, the conformation of rules of the plane being perpendicular of 15, as shown in figure 14, this conformation of rules can produce Bragg reflection to the visible ray of specific waveforms, thus on state of (P state) is externally presented.Here it should be noted that, the voltage signal in cls stage is high voltage, and the ghost on piece image can be wiped by high voltage signal well.
Then, sequential scanning is line by line carried out line by line to cholesteric liquid crystal display screen and drives, until all line scannings driven, now, need the image of display just to present.
Be described with turntable driving one behavior example below.
It is 1KHz that column electrode 141 to turntable driving applies frequency 1/T2, voltage magnitude is the forward low voltage pulse signal (as Fig. 5) of 20V, other column electrodes 141 to not turntable driving apply the d. c. voltage signal (as Fig. 6) that voltage magnitude is 10V, the row electrode 151 that the pixel needing to be driven to dark-state on this column electrode 141 of turntable driving is corresponding applies and the voltage signal voltage signal (as Fig. 7) that only phase place is contrary applied on the column electrode 141 of turntable driving, the row electrode 151 that when needing to keep initial on this column electrode 141 of turntable driving, the pixel of on state of is corresponding applies the voltage signal (as Fig. 8) identical with the voltage signal applied on the column electrode 141 of turntable driving.
Therefore, the pixel being driven to dark-state is needed on this column electrode 141 of turntable driving, the voltage waveform be superimposed upon on these pixels is bidirectional pulse and is 20V (as Figure 10) at every flashy voltage magnitude, be greater than and brightly turn dark-state threshold V T H and be 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 after voltage effect, cholesteric liquid crystal molecule 1 31 in mixolimnion 13 part corresponding to these pixels becomes disordered chain state, i.e. out of order form, as shown in Figure 1, this out of order form can not produce Bragg reflection to the visible ray of specific waveforms, thus dark-state (FC state) is externally presented.
The pixel being retained as on state of is needed on this column electrode 141 of turntable driving, the voltage waveform be superimposed upon on these pixels is 0, be less than and brightly turn dark-state threshold V T H, as shown in figure 11, therefore, the arrangement form of the cholesteric liquid crystal molecule 1 31 in mixolimnion 13 part corresponding to these pixels remains unchanged, and still can carry out Bragg reflection, thus externally still presents on state of (P state).
For the pixel that other column electrodes 141 of not turntable driving are formed with the row electrode 151 applying dark-state column scan pulse signal, although the voltage waveform be superimposed upon on these pixels is bidirectional pulse, but the voltage magnitude of this voltage waveform | V2-V3| is 10V, | V3| is 10V, all be less than and brightly turn dark-state threshold V T H, as shown in figure 12, therefore, the arrangement form of the cholesteric liquid crystal molecule 1 31 in mixolimnion 13 part corresponding to these pixels remains unchanged, and these pixels continue to keep original state.
For the pixel that other column electrodes 141 of not turntable driving are formed with the row electrode 151 applying on state of column scan pulse signal, although the voltage waveform be superimposed upon on these pixels is bidirectional pulse, but the voltage magnitude of this voltage waveform | V2-V3| is 10V, | V3| is 10V, also be all less than and brightly turn dark-state threshold V T H, as shown in figure 13, therefore, the arrangement form of the cholesteric liquid crystal molecule 1 31 in mixolimnion 13 part corresponding to these pixels also remains unchanged, and these pixels continue to keep original state.
When reality is implemented, the voltage magnitude V2 of one-way low pressure pulse signal and the voltage magnitude V3 of d. c. voltage signal can be made to follow following relational expression: the voltage magnitude V2 of one-way low pressure pulse signal equals the voltage magnitude V3 of the d. c. voltage signal of twice, i.e. V2=2V3, to make in the turntable driving stage, voltage integrating meter on each pixel is 0, thus achieves DC balance.And in the present invention, in the cls stage, the voltage integrating meter on each pixel is 0 naturally, therefore, the cls stage in the present invention self just maintains DC balance.
Advantage of the present invention is:
The present invention can effectively drive cholesteric liquid crystal display screen to carry out image display, and image display effect is good, and 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 know-why being preferred embodiment of the present invention and using; for a person skilled in the art; when not deviating from the spirit and scope of the present invention; any based on apparent changes such as the equivalent transformation on technical solution of the present invention basis, simple replacements, all belong within scope.
Claims (7)
1. a cholesteric liquid crystal display screen scanning drive method, this scanning drive method is used for cholesteric liquid crystal display screen, this cholesteric liquid crystal display screen comprises first, second base layer, mixolimnion is provided with between this first base layer and this second base layer, this mixolimnion is made up of cholesteric liquid crystal and conducting objects, this first base layer is provided with the first conductive electrode layer towards the side of this mixolimnion, this second base layer is provided with the second conductive electrode layer towards the side of this mixolimnion, this first conductive electrode layer is made up of multiple column electrode arranged in parallel, this second conductive electrode layer is made up of multiple row electrode arranged in parallel, this column electrode is mutually orthogonal with this row electrode and form pixel-matrix array structure, it is characterized in that, this scanning drive method comprises the steps:
Step one: remove the display image on this cholesteric liquid crystal display screen: be that the one-way high-pressure pulse signal of V1 is applied on all column electrodes, all row electrodes respectively by a pair voltage magnitude, to one-way high-pressure pulse signal, only phase place is contrary for this, wherein, the voltage magnitude V1 of this one-way high-pressure pulse signal is greater than on state of threshold voltage VC;
Step 2: carry out turntable driving to all column electrodes of this cholesteric liquid crystal display screen, wherein, each column electrode of turntable driving comprises the steps:
Column electrode to turntable driving applies line scanning pulse signal, it is the d. c. voltage signal of V3 that other column electrodes to not turntable driving apply voltage magnitude, the row electrode that the pixel needing to be driven to dark-state on this column electrode of turntable driving is corresponding applies dark-state column scan pulse signal, the row electrode that when needing to keep initial on this column electrode of turntable driving, the pixel of on state of is corresponding applies on state of column scan pulse signal, wherein: the one-way low pressure pulse signal of this line scanning pulse signal to be voltage magnitude be V2, only phase place is contrary for this dark-state column scan pulse signal and this line scanning pulse signal, this on state of column scan pulse signal is identical with this line scanning pulse signal, the voltage magnitude V2 of this one-way low pressure pulse signal is greater than and brightly turns dark-state threshold V T H and be less than this on state of threshold voltage VC, voltage magnitude V2 >=voltage magnitude V3, voltage magnitude V2-V3, voltage magnitude V3 is all less than this and brightly turns dark-state threshold V T H.
2. scanning drive method as claimed in claim 1, is characterized in that:
In described step one, in units of row electrode, all row electrodes are divided into multiple region, regional is emptied respectively, wherein, empty each region and comprise the steps: to be that the described one-way high-pressure pulse signal of V1 is applied on all column electrodes by voltage magnitude, all row electrodes in this region emptied apply and the described one-way high-pressure pulse signal voltage signal that only phase place is contrary, and the voltage signal that on all row electrodes in all the other regions, applying is identical with described one-way high-pressure pulse signal.
3. scanning drive method as claimed in claim 1, is characterized in that:
In described step one, in units of column electrode, all column electrodes are divided into multiple region, regional is emptied respectively, wherein, empty each region and comprise the steps: to be that the described one-way high-pressure pulse signal of V1 is applied on all row electrodes by voltage magnitude, all column electrodes in this region emptied apply and the described one-way high-pressure pulse signal voltage signal that only phase place is contrary, and the voltage signal that on all column electrodes in all the other regions, applying is identical with described one-way high-pressure pulse signal.
4. the scanning drive method as described in claim 1 or 2 or 3, is characterized in that:
Described one-way high-pressure pulse signal is forward or negative sense high-voltage pulse signal;
The frequency of described one-way high-pressure pulse signal for being more than or equal to 1Hz and being less than or equal to 10KHz, voltage magnitude V1 for being more than or equal to 25V and being less than or equal to 50V, the pulse loading described one-way high-pressure pulse signal to number for being more than or equal to 1 and being less than or equal to 200.
5. the scanning drive method as described in claim 1 or 2 or 3, is characterized in that:
Described one-way low pressure pulse signal is forward or negative sense low voltage pulse signal;
The frequency of described one-way low pressure pulse signal for being more than or equal to 100Hz and being less than or equal to 20KHz, voltage magnitude V2 for being more than or equal to 12V and being less than 25V, the pulse loading described one-way low pressure pulse signal to number for being more than or equal to 1 and being less than or equal to 200.
6. the scanning drive method as described in claim 1 or 2 or 3, is characterized in that:
The voltage magnitude V3 of described d. c. voltage signal is for being more than or equal to 1V and being less than or equal to 12V.
7. the scanning drive method as described in claim 1 or 2 or 3, is characterized in that:
The voltage magnitude V2 of described one-way low pressure pulse signal equals the voltage magnitude V3 of the described d. c. voltage signal of twice.
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| Publication number | Priority date | Publication date | Assignee | Title |
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| WO2024093592A1 (en) * | 2022-10-31 | 2024-05-10 | 京东方科技集团股份有限公司 | Display panel and manufacturing method therefor, display driving method, and storage medium |
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| WO2024093592A1 (en) * | 2022-10-31 | 2024-05-10 | 京东方科技集团股份有限公司 | Display panel and manufacturing method therefor, display driving method, and storage medium |
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| CN104658490B (en) | 2017-06-13 |
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