CN102831865A - Dynamic scan driving method for smectic phase LCD (liquid crystal display) - Google Patents
Dynamic scan driving method for smectic phase LCD (liquid crystal display) Download PDFInfo
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Abstract
The invention discloses a dynamic scan driving method for a smectic phase LCD (liquid crystal display). The method comprises the following steps of: scanning and driving all lines of a display screen; applying a corresponding line pulse to the scanned and driven line when each line is scanned and driven, wherein the line pulse is a high-frequency high-voltage positive and negative pulse with a duty ratio of 50%; applying zero-volt voltages to other lines free from scanning and driving; and meanwhile, applying a corresponding column pulse to each column, wherein voltage amplitudes of the line pulse applied on each line and the column pulse applied on each column can be controlled according to amount of required voltage energy caused by each display state on pixels, different distances of leading-out terminals of line distance column electrode and the different distances of the leading-out terminals of column distance line electrode. According to the dynamic scan driving method disclosed by the invention, the voltage amplitudes of the line pulse and the column pulse can be dynamically adjusted in the whole scanning and driving period, therefore, a phenomenon that the pixels with no need of being driven by high-voltage energy are driven by excessively high voltage energy can be avoided to a great degree, and power consumption is dramatically reduced.
Description
Technical field
The present invention relates to a kind of scanning drive method of display screen, refer to a kind of smectic liquid crystal display screen dynamic scanning drive method especially.
Background technology
At present; Smectic liquid crystal display screen (can be described as smectic liquid crystal display screen again) generally all uses the high-frequency and high-voltage positive negative pulse stuffing to be used as driving the voltage waveform of row, row electrode; As shown in Figure 1, this high-frequency and high-voltage positive negative pulse stuffing is the wave form of positive negative pulse stuffing to realizing that positive pulse and negative pulse constitute, and positive pulse and negative pulse in this high-frequency and high-voltage positive negative pulse stuffing are symmetrical; Voltage magnitude equates; Be Umx, and in whole turntable driving in the cycle, the voltage magnitude Umx of this high-frequency and high-voltage positive negative pulse stuffing is changeless.
, reality can find in implementing; Because there is threshold voltage in the smectic liquid crystal display screen; Therefore; Want to drive the smectic liquid crystal display screen; Successfully make each pixel on the smectic liquid crystal display screen between the bright state of full impregnated, vaporific lucifuge state, various gray state, change according to the image displaying contents; The voltage magnitude that is applied to the voltage waveform on display screen line, the row electrode must be greater than threshold voltage magnitude Uth, and the smectic liquid crystal molecule takes place that vaporific lucifuge state that out of order arrangement realizes takes place for the bright state of the full impregnated of regularly arranged realization, smectic liquid crystal molecule and be different between the bright state of full impregnated with the required voltage energy of various gray states between vaporific lucifuge state.And; After display screen initialization (all pixels are vaporific lucifuge state) is intact; Pixel presents the required voltage energy of various states and is followed successively by from small to large: keep vaporific lucifuge state, the bright state of full impregnated, gray state, and the required voltage energy of the low more gray state of gray is big more.
And; The electrode of smectic liquid crystal display screen is to divide ranks to draw from the both sides of display screen; Be that full frame all column electrodes are drawn from the column electrode exit on the display screen left side and are connected to the horizontal pulse driving circuit, full frame all row electrodes are drawn from the row electrode leads to client of display screen top and are connected to the row pulse driving circuit.See from horizontal direction; All horizontal pulses are all provided by the horizontal pulse driving circuit that column electrode is drawn; And pairing each pixel of column electrode is different apart from the distance of column electrode exit, and the difference of distance is representing the influence of column electrode resistance and row signal accumulative total different, for pairing each pixel of same column electrode; Pixel near the column electrode exit is driven to the bright state of full impregnated easily; Required voltage energy is little, is difficult for being driven to the bright state of full impregnated away from the pixel of column electrode exit, and required voltage energy is big.See that from vertical direction the column data of all row is all provided by the row pulse driving circuit that the row electrode is drawn, the distance of each row distance row electrode leads to client also is different; Apart from the pixel in the near more zone of row pulse driving circuit; It is driven to the bright state of full impregnated more easily, and required voltage energy is little, apart from the pixel in the row pulse driving circuit zone far away more; It is difficult for being driven to the bright state of full impregnated more, and required voltage energy is big.That is to say; For reality each pixel to be driven; They are different apart from the distance of row, row electrode leads to client; And the difference of distance is representing the influence of row-column electrode resistance and ranks signal accumulative total different, and required voltage energy possibly have nothing in common with each other when this had also just caused each pixel to be driven.
But; Because the value of the voltage waveform on the row-column electrode of smectic liquid crystal display screen is fixed at present, promptly all is that voltage magnitude is the high-frequency and high-voltage positive negative pulse stuffing of Umx, therefore; Can find out; The fixing high-frequency and high-voltage positive negative pulse stuffing of working voltage amplitude drives display screen, will certainly cause the serious waste of electric energy, and can cause brushing increasing the weight of of screen cumulative effect problem.
Therefore, design a kind of consume energy little, driving method is to need at present the problem that solves cheaply.
Summary of the invention
The object of the present invention is to provide a kind of smectic liquid crystal display screen dynamic scanning drive method; This method makes the voltage magnitude of the row pulse that applies on the horizontal pulse that applies on the column electrode and the row electrode according to respective pixel point need of display and in whole turntable driving dynamic adjustable in the cycle; Greatly reduce power consumption, prolonged the serviceable life of display screen.
To achieve these goals, the present invention has adopted following technical scheme:
A kind of smectic liquid crystal display screen dynamic scanning drive method; This smectic liquid crystal display screen comprises first base layer and second base layer; Between first base layer and second base layer, be provided with mixolimnion; Be provided with first conductive electrode layer at first base layer towards a side of mixolimnion, be provided with second conductive electrode layer at second base layer towards a side of mixolimnion, first conductive electrode layer is made up of M strip line electrode that is arranged in parallel; This M column electrode is drawn from this smectic liquid crystal display screen column electrode exit on one side and is connected to the horizontal pulse driving circuit; Second conductive electrode layer is made up of the strip row electrode that N is arranged in parallel, and this N row electrode drawn from the row electrode leads to client of this smectic liquid crystal display screen another side and be connected to the row pulse driving circuit, and N row electrode of the M of first conductive electrode layer column electrode and second conductive electrode layer be quadrature mutually; To form the pixel array of a M * N, it is characterized in that:
This dynamic scanning drive method comprises that all line scannings of advancing to this smectic liquid crystal display screen drive, wherein:
During each row of turntable driving: this row to turntable driving applies corresponding horizontal pulse; This horizontal pulse is that dutycycle is 50% high-frequency and high-voltage positive negative pulse stuffing; Other row to turntable driving not apply zero volt voltages; Apply corresponding row pulse to each row simultaneously, wherein: the horizontal pulse frequency that applies on the row pulse that corresponding the listing of pixel of vaporific shading state applies when keeping initial on this row of turntable driving and this row is identical, dutycycle is identical, phase place is identical; Present on this row of turntable driving that the horizontal pulse frequency that applies on row pulse that corresponding the listing of pixel of the bright state of full impregnated apply and this row is identical, dutycycle is identical, phase place is opposite; Be rendered as each pixel of the bright state of full impregnated on this row for turntable driving, the voltage magnitude that leaves the row pulse that applies on the near more pixel of column electrode exit is more little;
The corresponding voltage magnitude that lists the row pulse that applies of each pixel that is rendered as vaporific lucifuge state on this smectic liquid crystal display screen is the setting amplitude;
For all row of turntable driving, the voltage magnitude that leaves the horizontal pulse that applies on the near more row of row electrode leads to client is more little;
The voltage magnitude of each horizontal pulse is less than threshold voltage magnitude; The voltage magnitude of each row pulse is less than threshold voltage magnitude; For each pixel; The voltage magnitude addition of the row pulse that the voltage magnitude of the horizontal pulse that applies on the corresponding row of this pixel and corresponding the listing of this pixel apply is greater than threshold voltage magnitude, and the absolute value that the voltage magnitude of the row pulse that applies of the voltage magnitude of the horizontal pulse that applies on the row of this pixel correspondence and corresponding the listing of this pixel subtracts each other is less than threshold voltage magnitude.
Advantage of the present invention is:
According to the difference of each show state of pixel (bright, the vaporific lucifuge of full impregnated, gray state) required voltage energy size, the far and near different required voltage energy sizes that cause of each row distance row electrode leads to client and the difference of the far and near different required voltage energy sizes that cause of each column distance column electrode exit; The present invention can control the voltage magnitude size of the row pulse that applies on the horizontal pulse that applies on each column electrode, each row electrode flexibly; The voltage magnitude of the horizontal pulse of turntable driving and row pulse is in whole turntable driving dynamic adjustable in the cycle; But make the present invention on the basis of steady display image; Can avoid the use of the phenomenon generation that too high voltage energy drives the pixel that does not need the high voltage energy drives; Greatly reduce power consumption, prolonged the serviceable life of display screen, reduced brush screen cumulative effect; And guaranteed the DC balance (the positive and negative pulse that is the voltage waveform on each pixel can be cancelled out each other, and voltage integrating meter is 0) in the whole turntable driving cycle.
Description of drawings
Fig. 1 is a smectic liquid crystal display screen instance graph of the high-frequency and high-voltage positive negative pulse stuffing of use at present;
Fig. 2 is the composition synoptic diagram of smectic liquid crystal display screen;
Fig. 3 is arranged in the first and second conductive electrode layer synoptic diagram of lattice array shape anyhow;
Fig. 4 is realization flow figure of the present invention;
Fig. 5 is an instance graph of horizontal pulse among the present invention.
Embodiment
Smectic liquid crystal display screen dynamic scanning drive method of the present invention is a kind of method that is used on the smectic liquid crystal display screen.As shown in Figures 2 and 3, this smectic liquid crystal display screen 10 comprises that the material of first base layer 11 and second base layer, 12, the first base layers 11 and second base layer 12 is chosen as transparent glass or plastics.Between first base layer 11 and second base layer 12, be provided with the mixolimnion 13 that forms by smectic liquid crystal and additives mixed.This smectic liquid crystal (be called the smectic phase liquid crystal again, show as the smectic liquid crystal molecule on the microcosmic, state as follows) in compound, four cyano four octyl group biphenyl or tetraacethyl ester in the last of the ten Heavenly stems four cyano biphenyl of band siloxy any or appoint several kinds potpourri.Additive is the compound of band conductive characteristic, contains the compound of conductive ion like cetyltriethylammonium bromide etc.Be coated with first conductive electrode layer 14 at first base layer 11 towards a side of mixolimnion 13; Be coated with second conductive electrode layer 15 at second base layer 12 towards a side of mixolimnion 13; As shown in Figure 3, first conductive electrode layer 14 is made up of M strip line electrode 141 that is arranged in parallel, and this M column electrode 141 is drawn from this smectic liquid crystal display screen 10 column electrode exit on one side and is connected to horizontal pulse driving circuit (not shown); In this application; A column electrode is regarded as delegation, and second conductive electrode layer 15 is made up of N strip row electrode 151 that is arranged in parallel, and this N row electrode drawn from the row electrode leads to client of these smectic liquid crystal display screen 10 another sides and be connected to row pulse driving circuit (not shown); In this application; A row electrode is regarded as row, and N row electrode 151 of the M of first conductive electrode layer 14 column electrode 141 and second conductive electrode layer 15 be quadrature mutually, and this first conductive electrode layer 14 and second conductive electrode layer 15 form the pixel-matrix array structure (M, N are positive integer) of a M * N; A column electrode and a row electrode form a pixel, pixel 20 for example shown in Figure 3.That is to say, display screen be M capable * N row standard, have that M is capable, N row, delegation is to there being N pixel.In the present invention, applying voltage waveform to row is to realize through applying voltage waveform to the corresponding column electrode of this row, and in like manner, applying voltage waveform to row is through realizing to the corresponding row electrode application voltage waveform of these row.These two conductive electrode layers 14 and 15 and middle mixolimnion 13 formed a capacitance structure that area is very big.First conductive electrode layer 14 and second conductive electrode layer 15 are transparent, and it can be ITO (tin indium oxide) etc., and can use auxiliary metal electrode as required, like aluminium, copper, silver etc.This display screen can be provided with the black backboard or backboard is not set.
Like Fig. 1, all line scannings of advancing that the present invention includes this smectic liquid crystal display screen 10 drive, wherein:
During each row of turntable driving: this row to turntable driving applies corresponding horizontal pulse; This horizontal pulse is that dutycycle is 50% high-frequency and high-voltage positive negative pulse stuffing; Other row to turntable driving not apply zero volt voltages; Apply corresponding row pulse to each row simultaneously, wherein: the pixel of vaporific shading state is corresponding when keeping initialization on this row of turntable driving lists that the horizontal pulse frequency that applies on the row pulse that applies and this row is identical, dutycycle is identical, phase place is identical; Present on this row of turntable driving that the horizontal pulse frequency that applies on row pulse that corresponding the listing of pixel of the bright state of full impregnated apply and this row is identical, dutycycle is identical, phase place is opposite; Be rendered as each pixel of the bright state of full impregnated on this row for turntable driving; The voltage magnitude that leaves the row pulse that applies on the near more pixel of column electrode exit is more little (promptly; From from the column electrode exit by as far as seeing recently, the voltage magnitude that is rendered as the row pulse that applies on each pixel of the bright state of full impregnated reduces gradually);
The corresponding voltage magnitude that lists the row pulse that applies of each pixel that is rendered as vaporific lucifuge state on this smectic liquid crystal display screen is the setting amplitude;
For all row of turntable driving, the voltage magnitude that leaves the horizontal pulse that applies on the near more row of row electrode leads to client more little (that is, from reducing gradually) from the voltage magnitude of row electrode leads to client by the horizontal pulse that on see recently, each is capable, applies;
The voltage magnitude of each horizontal pulse (being positive number) is less than threshold voltage magnitude; The voltage magnitude of each row pulse (being positive number) is less than threshold voltage magnitude; For each pixel; The voltage magnitude addition of the row pulse that the voltage magnitude of the horizontal pulse that applies on the corresponding row of this pixel and corresponding the listing of this pixel apply is greater than threshold voltage magnitude, and the absolute value that the voltage magnitude of the row pulse that applies of the voltage magnitude of the horizontal pulse that applies on the row of this pixel correspondence and corresponding the listing of this pixel subtracts each other is less than threshold voltage magnitude.
In sum, delegation finished turntable driving after, just next line is carried out turntable driving, intact until all row of display screen by turntable driving.After all line scannings drove completion, image refreshing was accomplished, and just can demonstrate required black white image.
Can set by actual demand all of display screen orders that line scannings drive of advancing; For example, can be that line scanning driving in order line by line, backward line scanning driving, segmentation line scanning drive, algorithm line scanning in two fens drives or out of order at random line scanning any in driving.
Like Fig. 5; Horizontal pulse in the inventive method is the high-frequency and high-voltage positive negative pulse stuffing; The frequency of this high-frequency and high-voltage positive negative pulse stuffing is fs (fs=1/Ts), and to constituting, a pulse is made up of a direct impulse A and a negative-going pulse B C this high-frequency and high-voltage positive negative pulse stuffing by a plurality of pulses of joining continuously; This direct impulse the same with the duration of this negative-going pulse (being dutycycle 50%), this direct impulse equates with the absolute value of the voltage magnitude of this negative-going pulse.That is to say that like Fig. 5, the voltage magnitude of this direct impulse and this negative-going pulse size is the same, but the voltage magnitude of direct impulse (Ur1) for the voltage magnitude of negative-going pulse just (Ur1) for bearing.
For the present invention, as stated, pixel also can be shown as different gray states except being shown as black and white.Realize that the concrete grammar that different gray states show is:
During each row of turntable driving; Present on this row of turntable driving that pulse in the horizontal pulse that applies on a part of pulse pair and this row in the row pulse that corresponding the listing of pixel of the arbitrary gray state between the bright state of full impregnated and vaporific lucifuge state apply is identical to frequency, dutycycle is identical, phase place is opposite; And the pulse in the horizontal pulse that applies on another part pulse pair and this row is identical to frequency, dutycycle is identical, phase place is identical; Wherein: in corresponding the listing in the row pulse that applies of this pixel; Corresponding to number and this pixel gray state to display with the pulse in the horizontal pulse that applies on this row to the opposite pulse of phase place; In reality, can with this row in the horizontal pulse that applies pulse to the opposite pulse of phase place to be arranged in preceding and will be with pulse in the horizontal pulse that applies on this row to the identical pulse of phase place to after being arranged in; Present the corresponding voltage magnitude that lists the row pulse that applies of each pixel of arbitrary gray state less than threshold voltage magnitude; The voltage magnitude addition that presents the horizontal pulse that applies on the corresponding voltage magnitude that lists the row pulse that applies of the pixel of the arbitrary gray state row corresponding with this pixel is greater than threshold voltage magnitude, and the absolute value that the voltage magnitude of the horizontal pulse that applies on the voltage magnitude that lists the row pulse that applies of this pixel correspondence row corresponding with this pixel subtracts each other is less than threshold voltage magnitude;
Be rendered as each pixel of same gray state on this row for turntable driving; The voltage magnitude that leaves the row pulse that applies on the near more pixel of column electrode exit is more little (promptly; From from the column electrode exit by as far as seeing recently, the voltage magnitude that is rendered as the row pulse that applies on each pixel of same gray state reduces gradually);
Pixel for same position place on this row of turntable driving; The voltage magnitude of the row pulse that the voltage magnitude that presents the row pulse that applies on the pixel of arbitrary gray state applies when presenting the bright state of full impregnated greater than this pixel; And; Gray is low more, the voltage magnitude of the row pulse that applies bigger (driving according to pixel is that each gray state, the required voltage energy of the bright state of full impregnated are set).
For example; Set that display screen can show from 0 to Qs, Qs+1 displayed value (Qs＞15) altogether, the bright state of displayed value 0 corresponding full impregnated, the vaporific lucifuge state of displayed value Qs correspondence; Gray-scale value (being displayed value) 1 to Qs-1 corresponding different gray states; So, be 15 gray state if pixel is wanted display gray shade value, then pixel is corresponding list in the respective column pulse that applies with row on pulse in the horizontal pulse that applies opposite pulse is Qs-15 to number to phase place.
No matter be the display screen that shows black white image; Still the display screen that shows the black-white-gray image; In reality; Because present the vaporific lucifuge state after the pixel of vaporific lucifuge state just continues initialization, any change takes place in the arrangement form that this pixel does not need voltage energy (voltage magnitude by pulse embodies) to drive the smectic liquid crystal in its corresponding mixolimnion, but pixel will be rendered as the bright state of full impregnated; Must be from vaporific lucifuge state variation to the bright state of full impregnated; Be rendered as arrangement form that the pixel of the bright state of full impregnated needs the smectic liquid crystal in certain voltage energy mixolimnion that it is corresponding from the out of order rule of changing into, therefore, for the pixel at same position place on this row of turntable driving; Can set: the voltage magnitude of the row pulse that the voltage magnitude that presents the row pulse that applies on the pixel of vaporific lucifuge state applies when presenting the bright state of full impregnated less than this pixel, so just reduced the consumption of electric energy to a great extent.In addition; Also can set: for whole smectic liquid crystal display screen 10; The voltage magnitude that presents the row pulse that applies on the pixel of vaporific lucifuge state equals on the whole smectic liquid crystal display screen 10 relevant voltage amplitude required when being rendered as vaporific lucifuge state on all nearest pixel of column electrode exit and row electrode leads to client; This voltage magnitude is a voltage magnitude minimum in the row pulse that applies on all pixels, has so just greatly reduced power consumption.Certainly, the voltage magnitude that presents the row pulse that applies on the pixel of vaporific lucifuge state also can be arbitrary value, not necessarily is less than the voltage magnitude of the row pulse that applies when this pixel presents the bright state of full impregnated.
In the present invention, the span of the frequency of horizontal pulse is 1KHz≤fs≤25KHz, Ts=1/fs; The span of the voltage magnitude Ur of horizontal pulse is 10V≤Ur≤250V; Pulse in the horizontal pulse is 1≤Qs≤2000 to the span of number Qs; The span of the voltage magnitude Uc of row pulse is 10V≤Uc≤250V.It should be noted that limit by row, the used chip internal resource of row pulse driving circuit, frequency f s should be 1kHz～25kHz; Number Qs can not be above 2000; And, limit by row, row pulse driving circuit operating characteristic, the scope of amplitude Ur, Uc should be 10V～250V.For example, frequency f s can be 1kHz, 4kHz, 10kHz, 15kHz, 20kHz, 25kHz, and number Qs can be 1,500,1000,1500,2000, and amplitude Ur, Uc can be 10V, 50V, 100V, 150V, 250V.
, all line scannings of advancing to smectic liquid crystal display screen 10 also comprise initialization smectic liquid crystal display screen 10 before driving; Smectic phase LCDs images displayed is removed; Can be in full frame vaporific lucifuge (frosted) state to the full frame display screen that carries out behind the consistent initialization operation, specifically comprise step:
A1. a pair of frequency is identical, voltage magnitude is identical, phase place is opposite initially is loaded into respectively on each column electrode and each row electrode with the low-frequency high-voltage positive negative pulse stuffing, stopping behind first setting-up time loading should be to the initial low-frequency high-voltage positive negative pulse stuffing of using;
A2. a pair of frequency is identical, voltage magnitude is identical, phase place is opposite initially is loaded into respectively on each column electrode and each row electrode with the high-frequency and high-voltage positive negative pulse stuffing, stopping behind second setting-up time loading should be to the initial high-frequency and high-voltage positive negative pulse stuffing of using;
A3. repeating step a1 and a2 are at least once;
A4. repeating step a1 once;
Wherein:
Initial (basic identical with waveform shown in Figure 5 with the low-frequency high-voltage positive negative pulse stuffing; Just frequency difference and voltage magnitude maybe be different; Can understand with reference to figure 5) dutycycle be 50%; To constituting, an initial low frequency pulse is to being made up of a forward low-frequency pulse and a negative sense low-frequency pulse by a plurality of initial low frequency pulses of joining continuously, and this forward low-frequency pulse equates with the absolute value of the voltage magnitude of this negative sense low-frequency pulse;
Initial (basic identical with waveform shown in Figure 5 with the high-frequency and high-voltage positive negative pulse stuffing; Be that frequency, voltage magnitude possibility are different; Can understand with reference to figure 5) dutycycle be 50%; To constituting, an initial high frequency pulse is to being made up of a forward high-frequency impulse and a negative sense high-frequency impulse by a plurality of initial high frequency pulses of joining continuously, and this forward high-frequency impulse equates with the absolute value of the voltage magnitude of this negative sense high-frequency impulse;
Should be initial with the voltage magnitude of high-frequency and high-voltage positive negative pulse stuffing less than threshold voltage magnitude and twice should be initially with the voltage magnitude of high-frequency and high-voltage positive negative pulse stuffing greater than threshold voltage magnitude; Should be initial with the voltage magnitude of low-frequency high-voltage positive negative pulse stuffing less than threshold voltage magnitude and twice should be initially with the voltage magnitude of low-frequency high-voltage positive negative pulse stuffing greater than threshold voltage magnitude.
In reality is implemented; Loading initially with the low-frequency high-voltage positive negative pulse stuffing with before initially with the high-frequency and high-voltage positive negative pulse stuffing; Can make first conductive electrode layer 14 and second conductive electrode layer 15 in an interval time, be in off-position; Be greater than 0 and less than 100 milliseconds this interval time, and preferably, be greater than 0 and less than 5 milliseconds this interval time.
Initially use the span of the frequency of low-frequency high-voltage positive negative pulse stuffing to be 1Hz≤finit_d＜1000Hz; Initially use the span of the voltage magnitude of low-frequency high-voltage positive negative pulse stuffing to be 10V≤Uinit_d≤250V, initially using the initial low frequency pulse in the low-frequency high-voltage positive negative pulse stuffing is 1≤Qinit_d≤500 to the span of number; Initially use the span of the frequency of high-frequency and high-voltage positive negative pulse stuffing to be 1KHz≤finit_g＜25KHz; Initially use the span of the voltage magnitude of high-frequency and high-voltage positive negative pulse stuffing to be 10V≤Uinit_g≤250V, initially using the initial high frequency pulse in the high-frequency and high-voltage positive negative pulse stuffing is 1≤Qinit_g≤500 to the span of number.It should be noted that number Qinit_d, Qinit_g are controlled at 500 (comprising 500) and just can realize the cls effect with interior, limit by row, row pulse driving circuit operating characteristic, the scope of amplitude Uinit_d, Uinit_g should be 10V～250V.For example; Frequency f init_d, finit_g can be 1Hz, 50Hz, 500Hz, 800Hz, 990Hz; Number Qinit_d, Qinit_g can be 1,50,100,500, and amplitude Uinit_d, Uinit_g can be 10V, 50V, 100V, 150V, 250V.
Principle of work of the present invention is described below.
At first, display screen is carried out initialization, display screen is full frame to present vaporific shading state, as acute-matte.Then, display screen is carried out line by line line scanning driving (promptly scanning by walking to the capable order of M from the 1st) in order line by line,, at this moment, need images displayed just to show until all line scannings have been driven, specifically:
Size according to the far and near different required voltage energy that cause of the size of the far and near different required voltage energy that cause of the size of each show state (bright, the vaporific lucifuge of full impregnated, each gray state) required voltage energy, each row distance row electrode leads to client and each column distance column electrode exit; In line scanning that each is advanced drives; The voltage magnitude of the row pulse that applies on the voltage magnitude of the horizontal pulse that applies on each column electrode of corresponding control and each row electrode; Thereby spent voltage energy is an an amount of value and can not waste electric energy when making each pixel be rendered as required show state; Wherein, the value size of the voltage magnitude of row, row pulse is followed the voltage magnitude setting rule in the invention described above method.
For the pixel that will present the bright state of full impregnated; Corresponding line, the voltage waveform of row superimposed pulses on these pixels are that the two-way positive negative pulse stuffing of a high frequency and the voltage magnitude of the positive negative pulse stuffing in this two-way positive negative pulse stuffing (the voltage magnitude addition of the row pulse that list corresponding with pixel of voltage magnitude of the horizontal pulse that applies on the corresponding row of pixel applies gets) are all greater than threshold voltage magnitude Uth; Therefore; When voltage action time during less than 1 second, the arrangement form of the smectic liquid crystal molecule in pairing mixolimnion 13 parts of these pixels changes, and becomes regularly arranged form; At this moment; The long optical axis of smectic liquid crystal molecule is perpendicular to the plane of first, second conductive electrode layer 14,15, and the ray refraction of each smectic liquid crystal molecule of incident does not produce acute variation, and light can freely see through this mixolimnion part; On the macroscopic view, the mixolimnion that these pixels are corresponding partly presents the bright state of full impregnated.
For the pixel that will keep vaporific lucifuge state; Though corresponding line, the voltage waveform of row superimposed pulses on these pixels also are the two-way positive negative pulse stuffing of high frequency; But the voltage magnitude of the positive and negative pulse in this two-way positive negative pulse stuffing (voltage magnitude of the row pulse that list corresponding with pixel of voltage magnitude of the horizontal pulse that applies on the corresponding row of pixel applies subtract each other and get) is all less than threshold voltage magnitude Uth; Therefore; The arrangement form of the smectic liquid crystal molecule in pairing mixolimnion 13 parts of these pixels does not change, and the mixolimnion part is not affected, and these pixels keep original vaporific lucifuge state.
For the pixel that will present a certain gray state; Corresponding line, the voltage waveform of row superimposed pulses on these pixels are the two-way positive negative pulse stuffing of a high frequency; The voltage magnitude of a part of positive negative pulse stuffing in this two-way positive negative pulse stuffing (the voltage magnitude addition of the row pulse that list corresponding with pixel of voltage magnitude of the horizontal pulse that applies on the corresponding row of pixel applies and get) voltage magnitude of another part positive negative pulse stuffing greater than threshold voltage magnitude Uth (voltage magnitude of the row pulse that the voltage magnitude of the horizontal pulse that applies on the corresponding row of pixel and corresponding the listing of pixel apply subtract each other and get) is less than threshold voltage magnitude Uth; Therefore; When voltage action time during less than 1 second; The arrangement form of the smectic liquid crystal molecule in pairing mixolimnion 13 parts of these pixels changes; Become the arrangement form of part distortion; This mixolimnion partly produces the astigmatic effect of respective degrees, and on the macroscopic view, the mixolimnion that these pixels are corresponding partly presents the progressive state of corresponding gray.
When turntable driving delegation; For the pixel that other row that apply 0V voltage and each row constitute; The voltage magnitude of corresponding line, the voltage waveform of row superimposed pulses on these pixels is the voltage magnitude of respective column pulse, less than threshold voltage magnitude Uth, therefore; The arrangement form of the smectic liquid crystal molecule in pairing mixolimnion 13 parts of these pixels does not change, and these pixels continue the original state of maintenance.
Do not use as outdoor display screen if display screen is not provided with backboard, the pixel of then vaporific lucifuge state is shown as black, and the pixel of the bright state of full impregnated is shown as white, and the pixel of certain gray state is shown as corresponding grey.If display screen is provided with the black backboard, the pixel of then vaporific lucifuge state is shown as white, and the pixel of the bright state of full impregnated is shown as black, and the pixel of certain gray state is shown as corresponding grey.
After pixel is shown as white, black or certain grey; Just the voltage signal that can remove row, lists; Pixel can continue to keep, and the maintenance of this show state does not need voltage signal to keep, promptly remove voltage signal after; The luminous effect that pixel produces in the time of still can keeping the on-load voltage signal, and the voltage signal of effect is just in order to change the arrangement form of smectic liquid crystal molecule.In the present invention, this state that does not need electricity to drive and keep luminous effect is called " multistable " or " quasistatic ".And this " multistable " is because additive has adopted the compound of band conductive characteristic; When voltage signal applies; Ion in the compound of band conductive characteristic changes the generation to-and-fro movement according to electric potential difference; This motion can change the arrangement form of smectic liquid crystal molecule, and the smectic liquid crystal molecules align form after changing does not need the persistent movement of ion to keep, and is stable.
In reality, according to the demonstration needs, also can be mixed with a certain amount of dichroic dye in the mixolimnion 13, like this, the mixolimnion of smectic liquid crystal display screen just can switch between the bright and coloured shading of full impregnated.For the smectic liquid crystal display screen that has mixed dichroic dye; The smectic liquid crystal display screen identical (the physics realization principle of its pixel display image is similar with the smectic liquid crystal display screen of above-mentioned unmixed dichroic dye) of its dynamic scanning drive method and above-mentioned unmixed dichroic dye here repeats no more.
In the present invention, be to realize to the judgement of the pixel of the bright state of full impregnated, vaporific shading state and arbitrary gray state through the record in the reading images storer, each pixel state to be shown with the behavior unit record in this video memory.Threshold voltage magnitude Uth is for making the smectic liquid crystal molecule by driving the magnitude of voltage that arrangement form changes taken place, and it is to confirm according to the composition of mixolimnion and thickness, and generally Uth is more than the 5V.
Advantage of the present invention is:
According to the difference of each show state of pixel (bright, the vaporific lucifuge of full impregnated, gray state) required voltage energy size, the far and near different required voltage energy sizes that cause of each row distance row electrode leads to client and the difference of the far and near different required voltage energy sizes that cause of each column distance column electrode exit; The present invention can control the voltage magnitude size of the row pulse that applies on the horizontal pulse that applies on each column electrode, each row electrode flexibly; The voltage magnitude of the horizontal pulse of turntable driving and row pulse is in whole turntable driving dynamic adjustable in the cycle; But make the present invention on the basis of steady display image; Can avoid the use of the phenomenon generation that too high voltage energy drives the pixel that does not need the high voltage energy drives; Greatly reduce power consumption, prolonged the serviceable life of display screen, reduced brush screen cumulative effect; And guaranteed the DC balance (the positive and negative pulse that is the voltage waveform on each pixel can be cancelled out each other, and voltage integrating meter is 0) in the whole turntable driving cycle.
For example, it is the high-frequency and high-voltage positive negative pulse stuffing of Umx that voltage magnitude is all adopted in capable in the prior art, row pulse, according to the inventive method; List the pixel that will present vaporific lucifuge state for the 1st row the 1st; Make the corresponding row of this pixel, list and apply the horizontal pulse that voltage magnitude is U1, the row pulse that voltage magnitude is U2 respectively, can make this pixel realize vaporific lucifuge state, and U1, U2 all are far smaller than Umx; That is to say; According to the inventive method, drive the spent electric energy of this pixel and just be far smaller than the spent electric energy of use prior art this pixel of driving, reached the purpose of very big saving electric energy.
Above-mentioned is preferred embodiment of the present invention and the know-why used thereof; For a person skilled in the art; Under the situation that does not deviate from the spirit and scope of the present invention; Any based on conspicuous changes such as the equivalent transformation on the technical scheme of the present invention basis, simple replacements, all belong within the protection domain of the present invention.
Claims (10)
1. smectic liquid crystal display screen dynamic scanning drive method; This smectic liquid crystal display screen comprises first base layer and second base layer; Between first base layer and second base layer, be provided with mixolimnion; Be provided with first conductive electrode layer at first base layer towards a side of mixolimnion, be provided with second conductive electrode layer at second base layer towards a side of mixolimnion, first conductive electrode layer is made up of M strip line electrode that is arranged in parallel; This M column electrode is drawn from this smectic liquid crystal display screen column electrode exit on one side and is connected to the horizontal pulse driving circuit; Second conductive electrode layer is made up of the strip row electrode that N is arranged in parallel, and this N row electrode drawn from the row electrode leads to client of this smectic liquid crystal display screen another side and be connected to the row pulse driving circuit, and N row electrode of the M of first conductive electrode layer column electrode and second conductive electrode layer be quadrature mutually; To form the pixel array of a M * N, it is characterized in that:
This dynamic scanning drive method comprises that all line scannings of advancing to this smectic liquid crystal display screen drive, wherein:
During each row of turntable driving: this row to turntable driving applies corresponding horizontal pulse; This horizontal pulse is that dutycycle is 50% high-frequency and high-voltage positive negative pulse stuffing; Other row to turntable driving not apply zero volt voltages; Apply corresponding row pulse to each row simultaneously, wherein: the horizontal pulse frequency that keeps on this row of turntable driving applying on row pulse that corresponding the listing of pixel of vaporific shading state apply and this row is identical, dutycycle is identical, phase place is identical; Present on this row of turntable driving that the horizontal pulse frequency that applies on row pulse that corresponding the listing of pixel of the bright state of full impregnated apply and this row is identical, dutycycle is identical, phase place is opposite; Be rendered as each pixel of the bright state of full impregnated on this row for turntable driving, the voltage magnitude that leaves the row pulse that applies on the near more pixel of column electrode exit is more little;
The corresponding voltage magnitude that lists the row pulse that applies of each pixel that is rendered as vaporific lucifuge state on this smectic liquid crystal display screen is the setting amplitude;
For all row of turntable driving, the voltage magnitude that leaves the horizontal pulse that applies on the near more row of row electrode leads to client is more little;
The voltage magnitude of each horizontal pulse is less than threshold voltage magnitude; The voltage magnitude of each row pulse is less than threshold voltage magnitude; For each pixel; The voltage magnitude addition of the row pulse that the voltage magnitude of the horizontal pulse that applies on the corresponding row of this pixel and corresponding the listing of this pixel apply is greater than threshold voltage magnitude, and the absolute value that the voltage magnitude of the row pulse that applies of the voltage magnitude of the horizontal pulse that applies on the row of this pixel correspondence and corresponding the listing of this pixel subtracts each other is less than threshold voltage magnitude.
2. dynamic scanning drive method as claimed in claim 1 is characterized in that:
To constituting, a pulse is to being made up of a direct impulse and a negative-going pulse by a plurality of pulses of joining continuously for said high-frequency and high-voltage positive negative pulse stuffing, and this direct impulse equates with the absolute value of the voltage magnitude of this negative-going pulse.
3. dynamic scanning drive method as claimed in claim 2 is characterized in that:
For the pixel at same position place on this row of turntable driving, the voltage magnitude of the row pulse that the voltage magnitude that presents the row pulse that applies on the pixel of vaporific lucifuge state applies when presenting the bright state of full impregnated less than this pixel.
4. dynamic scanning drive method as claimed in claim 2 is characterized in that:
During each row of turntable driving; Present on this row of turntable driving that pulse in the horizontal pulse that applies on a part of pulse pair and this row in the row pulse that corresponding the listing of pixel of the arbitrary gray state between the bright state of full impregnated and vaporific lucifuge state apply is identical to frequency, dutycycle is identical, phase place is opposite; And the pulse in the horizontal pulse that applies on another part pulse pair and this row is identical to frequency, dutycycle is identical, phase place is identical; Wherein:, corresponding to the opposite pulse of phase place to number and this pixel gray state to display with the pulse in the horizontal pulse that applies on this row in corresponding the listing in the row pulse that applies of this pixel; Present the corresponding voltage magnitude that lists the row pulse that applies of each pixel of arbitrary gray state less than threshold voltage magnitude; The voltage magnitude addition that presents the horizontal pulse that applies on the corresponding voltage magnitude that lists the row pulse that applies of the pixel of the arbitrary gray state row corresponding with this pixel is greater than threshold voltage magnitude, and the absolute value that the voltage magnitude of the horizontal pulse that applies on the voltage magnitude that lists the row pulse that applies of this pixel correspondence row corresponding with this pixel subtracts each other is less than threshold voltage magnitude;
Be rendered as each pixel of same gray state on this row for turntable driving, the voltage magnitude that leaves the row pulse that applies on the near more pixel of column electrode exit is more little;
Pixel for same position place on this row of turntable driving; The voltage magnitude of the row pulse that the voltage magnitude that presents the row pulse that applies on the pixel of arbitrary gray state applies when presenting the bright state of full impregnated greater than this pixel; And; Gray is low more, and the voltage magnitude of the row pulse that applies is big more.
5. dynamic scanning drive method as claimed in claim 4 is characterized in that:
For the pixel at same position place on this row of turntable driving, the voltage magnitude of the row pulse that the voltage magnitude that presents the row pulse that applies on the pixel of vaporific lucifuge state applies when presenting the bright state of full impregnated less than this pixel.
6. like claim 3 or 5 described dynamic scanning drive methods, it is characterized in that:
For whole said smectic liquid crystal display screen, the voltage magnitude that presents the row pulse that applies on the pixel of vaporific lucifuge state equals on the whole smectic liquid crystal display screen relevant voltage amplitude required when being rendered as vaporific lucifuge state on all nearest pixel of column electrode exit and row electrode leads to client.
7. like claim 2 or 4 described dynamic scanning drive methods, it is characterized in that:
The span of the frequency of said horizontal pulse is 1KHz≤fs≤25KHz; The span of the voltage magnitude of said horizontal pulse is 10V≤Ur≤250V; Pulse in the said horizontal pulse is 1≤Qs≤2000 to the span of number; The span of the voltage magnitude of said row pulse is 10V≤Uc≤250V.
8. dynamic scanning drive method as claimed in claim 1 is characterized in that:
To all row turntable driving of carrying out be that line scanning driving in order line by line, backward line scanning driving, segmentation line scanning drive, algorithm line scanning in two fens drives or out of order at random line scanning driving in any.
9. like claim 1 or 4 described dynamic scanning drive methods, it is characterized in that:
Also comprise the said smectic liquid crystal display screen of initialization before all line scannings drivings of advancing to said smectic liquid crystal display screen, smectic phase LCDs images displayed removed, specifically comprise step:
A1. a pair of frequency is identical, voltage magnitude is identical, phase place is opposite initially is loaded into respectively on each column electrode and each row electrode with the low-frequency high-voltage positive negative pulse stuffing, stopping behind first setting-up time loading should be to the initial low-frequency high-voltage positive negative pulse stuffing of using;
A2. a pair of frequency is identical, voltage magnitude is identical, phase place is opposite initially is loaded into respectively on each column electrode and each row electrode with the high-frequency and high-voltage positive negative pulse stuffing, stopping behind second setting-up time loading should be to the initial high-frequency and high-voltage positive negative pulse stuffing of using;
A3. repeating step a1 and a2 are at least once;
A4. repeating step a1 once;
Wherein:
The dutycycle of initial use low-frequency high-voltage positive negative pulse stuffing is 50%; By a plurality of initial low frequency pulses of joining continuously to constituting; An initial low frequency pulse is to being made up of a forward low-frequency pulse and a negative sense low-frequency pulse, and this forward low-frequency pulse equates with the absolute value of the voltage magnitude of this negative sense low-frequency pulse;
The dutycycle of initial use high-frequency and high-voltage positive negative pulse stuffing is 50%; By a plurality of initial high frequency pulses of joining continuously to constituting; An initial high frequency pulse is to being made up of a forward high-frequency impulse and a negative sense high-frequency impulse, and this forward high-frequency impulse equates with the absolute value of the voltage magnitude of this negative sense high-frequency impulse;
Should be initial with the voltage magnitude of high-frequency and high-voltage positive negative pulse stuffing less than threshold voltage magnitude and twice should be initially with the voltage magnitude of high-frequency and high-voltage positive negative pulse stuffing greater than threshold voltage magnitude; Should be initial with the voltage magnitude of low-frequency high-voltage positive negative pulse stuffing less than threshold voltage magnitude and twice should be initially with the voltage magnitude of low-frequency high-voltage positive negative pulse stuffing greater than threshold voltage magnitude.
10. dynamic scanning drive method as claimed in claim 9 is characterized in that:
The said initial span of the frequency of low-frequency high-voltage positive negative pulse stuffing of using is 1Hz≤finit_d＜1000Hz; The said initial span of the voltage magnitude of low-frequency high-voltage positive negative pulse stuffing of using is 10V≤Uinit_d≤250V, and the initial low frequency pulse in the said initial use low-frequency high-voltage positive negative pulse stuffing is 1≤Qinit_d≤500 to the span of number;
The said initial span of the frequency of high-frequency and high-voltage positive negative pulse stuffing of using is 1KHz≤finit_g＜25KHz; The said initial span of the voltage magnitude of high-frequency and high-voltage positive negative pulse stuffing of using is 10V≤Uinit_g≤250V, and the initial high frequency pulse in the said initial use high-frequency and high-voltage positive negative pulse stuffing is 1≤Qinit_g≤500 to the span of number.
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