CN102402033B - Column region correction scanning drive method for smectic liquid crystal display screen - Google Patents
Column region correction scanning drive method for smectic liquid crystal display screen Download PDFInfo
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Abstract
The invention discloses a column region correction scanning drive method for a smectic liquid crystal display. The method comprises the following steps of: carrying out initialization; dividing each line of a display screen into a plurality of regions in the horizontal direction; generating a region gray scale modulometer according to the divided regions; selecting a scanning mode and determining a scanning sequence series corresponding to the scanning mode; sequentially reading each line number from the scanning sequence series; in the process of reading the line number, determining a region of each pixel point corresponding to a line electrode represented by the line number, and a gray scale correction value through the region gray scale modulometer so that the line electrode outputs a line pulse voltage, modulating the corresponding gray scale correction value according to the pixel point corresponding to each column electrode through the column electrode to obtain a gray scale value, and outputting a corresponding column pulse voltage; after reading the scanning sequence series, stopping outputting voltage, and finishing displaying of an image. According to the method disclosed by the invention, the region inconsistency of the display screen in the horizontal direction is improved by modifying the gray scale values of the pixel points, and the display effect of the display screen is promoted.
Description
Technical field
The present invention relates to a kind of scanning drive method, specifically, relate to a kind of column region correct scan driving method that is applied to smectic liquid crystal display screen.
Background technology
Liquid crystal display is one of at present the most promising flat-panel display device, traditional liquid crystal display is all passive demonstration, and transmission-type shows, only under the condition of additional backlight, just can show, but the power consumption of backlight is more than the hundred times of the power consumption of liquid crystal own, very power consumption.Along with the development of liquid crystal technology, various liquid crystal materials emerge in an endless stream, and wherein do not need the reflective liquid crystal of backlight to rely on its low-power consumption characteristic to have absolute predominance.Smectic liquid crystal display screen in Chinese utility model patent " a kind of display control circuit " (patent No. is ZL200720190955.3) just one has adopted reflective liquid crystal---the reflection display device without backlight that smectic phase liquid crystal is made.Smectic liquid crystal display screen is with its distinctive film surface characteristic and reflection-type displaying principle, realized a kind of without backlight, simple in structure, visual angle is extensive, picture is steady, the display device of real safety and environmental protection, power saving, and it has the advantage such as long-term memory function and user's indefatigability, in the ranks of display, maintains the leading position.
At present, the scanning drive method that this smectic liquid crystal display screen is carried out to image refreshing is to adopt the full frame consistent type of drive of sequential scanning line by line, from apart from the nearest the first row of row pulse voltage driving circuit to applying horizontal pulse voltage apart from row pulse voltage driving circuit last column farthest successively order, in the time scanning certain a line, on column electrode corresponding to this row, apply the horizontal pulse voltage of setting, simultaneously, according to the half-tone information of this row image to be displayed, each is listed as and on corresponding row electrode, applies respectively corresponding row pulse voltage.Although this type of drive of sequential scanning is line by line simple, but, for this full frame consistent type of drive of sequential scanning line by line, in this turntable driving process, the horizontal pulse voltage waveform applying on full frame all column electrodes is in full accord, the i.e. pulse of the horizontal pulse voltage of all row is all identical to number, frequency, voltage magnitude, and the content that different each row electrodes that just this row is corresponding can show according to pixel applies the respective column pulse voltage of corresponding shade of gray information.Because the electrode of this 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 and are connected to horizontal pulse Voltag driving circuit from the column electrode exit on the display screen left side, full frame all row electrodes are drawn and are connected to row pulse voltage driving circuit from the row electrode leads to client of display screen top, from horizontal direction, the horizontal pulse Voltag driving circuit that all horizontal pulse voltage is all drawn by column electrode provides, and corresponding each pixel of column electrode is different apart from the distance of column electrode exit, and the difference of distance is representing the difference that affects of column electrode resistance and row signal accumulative total.From practice, can find, column electrode resistance and row signal accumulative total for the rule that shows the impact causing are: for corresponding each pixel of same column electrode, pixel near column electrode exit is easily driven to all-transparent state, is difficult for being driven to all-transparent state away from the pixel of column electrode exit.In practice, this phenomenon can cause left and right two pre-GTG effects that show that the identical pixel actual displayed of GTG value goes out on display screen there are differences.In the time that display screen entirety shows the picture material of a definite GTG value, full frame display effect in the horizontal direction can be turned white apart from the increase of column electrode exit gradually along with pixel, and display screen presents the inconsistent phenomenon in obvious region in the horizontal direction.
As can be seen here, existing scanning drive method is difficult to overcome this full frame region inconsistency being caused by column electrode resistance and the impact of row signal accumulative total, is badly in need of finding at present a solution.
Summary of the invention
The object of the present invention is to provide a kind of column region correction scanning drive method for smectic liquid crystal display screen, the method has effectively improved the homogeneity that image shows in the horizontal direction, has improved the display quality of smectic liquid crystal display screen.
In order to achieve the above object, the present invention has adopted following technical scheme:
A kind of column region correction scanning drive method for smectic liquid crystal display screen, this smectic liquid crystal display screen comprises the first base layer and the second base layer, between the first base layer and the second base layer, be provided with a mixolimnion being formed by smectic phase liquid crystal and additives mixed, be provided with the first conductive electrode layer at the first base layer towards a side of mixolimnion, be provided with the second conductive electrode layer at the second base layer towards a side of mixolimnion, the first conductive electrode layer is made up of M the strip line electrode being arranged in parallel, this M column electrode is drawn and is connected to horizontal pulse Voltag driving circuit from the column electrode exit on this smectic liquid crystal display screen left side, the second conductive electrode layer is made up of N the strip row electrode being arranged in parallel, this N row electrode drawn and is connected to row pulse voltage driving circuit from the row electrode leads to client of this smectic liquid crystal display screen top, this M column electrode is mutually orthogonal with N row electrode, form the pixel array of a M × N, it is characterized in that: the method comprises the following steps:
Steps A: initialization smectic liquid crystal display screen;
Step B: every a line of this smectic liquid crystal display screen is divided into multiple regions in the horizontal direction, and each region comprises multiple pixels; According to formation zone, the region GTG value modulometer of dividing;
Step C: select a scan pattern, determine the scanning sequence series corresponding with this scan pattern, this scanning sequence series is by integer 1 to M, and M line number forms altogether, this M line number is by arranging with the corresponding order of this scan pattern;
Step D: read successively each line number from this scanning sequence series; In reading a line number, determine the region under each pixel that the column electrode of this line number representative is corresponding and need the gray scale correction value of modulation by this region GTG value modulometer, thereby this column electrode output horizontal pulse voltage, each row electrode is modulated the GTG value output respective column pulse voltage obtaining after corresponding gray scale correction value according to the pixel corresponding with it:
Step e: in the time having read this scanning sequence series, this first conductive electrode layer and this second conductive electrode layer stop output voltage, and an entire image just shows.
Advantage of the present invention is:
The inventive method is not changing under the prerequisite of existing driving framework, realize by revising the GTG value that pixel shows the region inconsistency of improving between the pixel that smectic liquid crystal display screen shows same gray level value in the horizontal direction, effectively improve the homogeneity that image shows, promoted the display effect of smectic liquid crystal display screen.
Accompanying drawing explanation
Fig. 1 is the composition schematic diagram of smectic liquid crystal display screen;
Fig. 2 is arranged in the first and second conductive electrode layer schematic diagram of lattice array shape anyhow;
Fig. 3 is realization flow figure of the present invention;
Fig. 4 is an exemplary plot of smectic liquid crystal display screen being carried out to region division;
Fig. 5 is an example of region GTG value modulometer;
Fig. 6 adopts the column region that the inventive method realizes to proofread and correct instance graph.
Embodiment
Describe the present invention below in conjunction with accompanying drawing.
Column region correct scan driving method of the present invention designs for smectic liquid crystal display screen.As depicted in figs. 1 and 2, this smectic liquid crystal display screen 10 comprises that the material of the first base layer 11 and the second base layer 12, the first base layers 11 and the second base layer 12 is chosen as glass or plastics.Between the first base layer 11 and the second base layer 12, be provided with a mixolimnion 13 being formed by smectic phase liquid crystal and additives mixed.This smectic phase liquid crystal (show as smectic phase liquid crystal molecule on microcosmic, see following) in compound, four cyano four octyl group biphenyl or tetraacethyl ester in last of the ten Heavenly stems four cyano biphenyl with siloxy any or appoint several mixing.Additive is the compound with conductive characteristic, the compound that contains conductive ion as cetyltriethylammonium bromide etc.Be coated with the first conductive electrode layer 14 at the first base layer 11 towards a side of mixolimnion 13, be coated with the second conductive electrode layer 15 at the second base layer 12 towards a side of mixolimnion 13, as shown in Figure 2, the first conductive electrode layer 14 is made up of M the strip line electrode 141 being arranged in parallel, this M column electrode 141 is drawn and is connected to horizontal pulse Voltag driving circuit (as Fig. 4) from the column electrode exit on these smectic liquid crystal display screen 10 left sides, in this application, a column electrode is counted as a line, the second conductive electrode layer 15 is made up of N the strip row electrode 151 being arranged in parallel, this N row electrode drawn and is connected to row pulse voltage driving circuit (as Fig. 4) from the row electrode leads to client of these smectic liquid crystal display screen 10 tops, in this application, a row electrode is counted as row, the M of the first conductive electrode layer 14 column electrode 141 is mutually orthogonal with N row electrode 151 of the second conductive electrode layer 15, this first conductive electrode layer 14 and the second conductive electrode layer 15 form the pixel-matrix array structure (M of a M × N, N is positive integer), a column electrode and a row electrode form a pixel, example pixel 20 as shown in Figure 2.That is to say, display screen be M capable × N row standard, have that M is capable, N row, a line is to there being N pixel.These two conductive electrode layers 14 and 15 and middle mixolimnion 13 formed a capacitance structure that area is very large.The first conductive electrode layer 14 and the second conductive electrode layer 15 are transparent, and it can be ITO (tin indium oxide) etc., and can use as required auxiliary metal electrode, as aluminium, copper, silver etc.
As shown in Figure 3, the present invention includes following steps:
Steps A: initialization smectic liquid crystal display screen.This object is the piclear that smectic liquid crystal display screen is shown, full frame All Ranges is carried out to consistent full frame initialization operation; Display screen after initialization is in full frame vaporific lucifuge (frosted) state, and full frame is white.Because initialization operation is to recover the low-lying level state that smectic phase liquid crystal molecule taxis more easily changes, therefore, the full frame otherness of initialization operation is also not obvious, does not need special subregion to carry out subregional initialization.Initialized detailed process is prior art, is not here described.
Step B: every a line of this smectic liquid crystal display screen is divided into multiple regions in the horizontal direction, and each region comprises multiple pixels; According to formation zone, the region GTG value modulometer (example as shown in Figure 5) of dividing.
Step C: select a scan pattern, determine the scanning sequence series corresponding with this scan pattern, in reality, the scanning sequence series corresponding with this scan pattern can read from ordered series of numbers storer.This scanning sequence series is by integer 1 to M, and M line number forms altogether, and this M line number is by arranging with the corresponding order of this scan pattern.
Step D: read successively each line number from this scanning sequence series; In reading a line number, determine the region under each pixel of column electrode 141 correspondences of this line number representative by this region GTG value modulometer and need the gray scale correction value of modulation, thereby this column electrode 141 is exported horizontal pulse voltage, each row electrode 151 is modulated GTG value (the actual GTG value that will show of pixel) the output respective column pulse voltage obtaining after corresponding gray scale correction value according to the pixel corresponding with it;
Step e: in the time having read this scanning sequence series, this first conductive electrode layer 14 and this second conductive electrode layer 15 stop output voltage, and an entire image just shows.
In step B, the region quantity that smectic liquid crystal display screen 10 each row are divided can be identical or different; The region quantity that every a line is divided is in the horizontal direction more than or equal to 1 and be less than or equal to
wherein: the subfield quantity that S has for horizontal pulse voltage.And the included pixel quantity of regional that a line on smectic liquid crystal display screen 10 is divided can be identical or different.Preferably, fewer the closer to the pixel of the district inclusion of column electrode exit, more more away from the pixel of the district inclusion of column electrode exit.
In actual applications, in step C, scan pattern can be any in sequential scanning pattern line by line, backward scan pattern, fractional scanning pattern, two points of algorithm scan patterns, random disorder scan pattern.The selection of scan pattern and the division in region are independent of each other, and scan pattern has been determined the order of turntable driving row, and the waveform of the row pulse voltage of each row electrode that while scanning a line, this row is corresponding has been determined in the division in region.The two width images that front and back show can adopt identical scan pattern or different scan patterns, to realize the flexible demonstration of image.
If scan pattern is sequential scanning pattern, the line number in scanning sequence series is to increase progressively arrangement from 1 to M order.If scan pattern is backward scan pattern, the line number in scanning sequence series is with the arrangement of successively decreasing from the order of M to 1.If scan pattern is fractional scanning pattern, line number 1 to M is divided into many groups, arranges for these many groups with setting order, and the line number in scanning sequence series is to set the corresponding arrangement of tactic this order of many groups.If scan pattern is two points of algorithm scan patterns, the order that line number in scanning sequence series obtains according to two points of algorithms in numerical algorithm is arranged.If scan pattern is random disorder scan pattern, the random sequence that line number in scanning sequence series obtains by random algorithm is arranged.
In the present invention, on smectic liquid crystal display screen 10 each pixel of every a line in the GTG value modulometer of region to having an affiliated area and a gray scale correction value (as Fig. 5).For the region nearer apart from column electrode exit, this region is shorter apart from the column electrode resistance length of horizontal pulse Voltag driving circuit, easily driven, and for the region far away apart from column electrode exit, this region is longer apart from the column electrode resistance length of horizontal pulse Voltag driving circuit, difficult quilt drives, therefore, in order to overcome inconsistence problems interregional in horizontal direction, GTG value apart from the pixel in the nearer region of column electrode exit should increase, be that gray scale correction value is positive integer, GTG value apart from the pixel in column electrode exit region far away should reduce, be that gray scale correction value is negative integer, the GTG value that is positioned at the pixel in display screen centre position can be constant, be that gray scale correction value is 0.For example, as shown in Figure 5, first pixel (pixel nearest apart from column electrode exit) that first column electrode is corresponding is positioned at region 1, its gray scale correction value be on the occasion of, and last pixel (apart from a column electrode exit pixel farthest) corresponding to first column electrode is positioned at region W, its gray scale correction value is negative value.
The pre-GTG value showing of pixel adds that gray scale correction value is the actual GTG value that will show of this pixel.In actual applications, the large I of gray scale correction value corresponding to each region is proofreaied and correct and is needed preset according to actual displayed.But need to guarantee, if row, column pulse voltage is provided with S subfield, to should have from 0 to S, common S+1 GTG value, so, the GTG value obtaining after correction will be between 0～S.If the GTG value obtaining after proofreading and correct is less than 0, needing to proofread and correct is 0; If the GTG value obtaining after proofreading and correct is greater than S, need to proofread and correct for S.
In the present invention, the row pulse voltage of the horizontal pulse voltage of each column electrode output and the output of each row electrode forms by S subfield, the application time length of each subfield in horizontal pulse voltage is corresponding one by one with the application time length of each subfield in row pulse voltage, and the voltage waveform of each subfield in horizontal pulse voltage respectively with the pulse of the voltage waveform of subfield corresponding thereto in row pulse voltage to number, frequency is identical and phase place is identical or contrary, in horizontal pulse voltage, the voltage magnitude of the voltage waveform of each subfield is less than threshold voltage magnitude, and in row pulse voltage, the voltage magnitude of the voltage waveform of each subfield is less than threshold voltage magnitude, in the time that the phase place of subfield in horizontal pulse voltage and a subfield corresponding thereto in row pulse voltage is identical, the voltage magnitude of the voltage waveform obtaining after the voltage waveform stack of this subfield in the voltage waveform of this subfield in this horizontal pulse voltage and this row pulse voltage is less than threshold voltage magnitude, in the time of the single spin-echo of a subfield corresponding thereto in subfield in horizontal pulse voltage and row pulse voltage, the voltage magnitude of the voltage waveform obtaining after the voltage waveform stack of this subfield in the voltage waveform of this subfield in this horizontal pulse voltage and this row pulse voltage is greater than threshold voltage magnitude.That is to say, in the voltage waveform of the each subfield in horizontal pulse voltage and row pulse voltage, the voltage magnitude of the voltage waveform of subfield corresponding thereto can be identical or different, and still, their voltage magnitude must meet above-mentioned requirements.
In the time of practical application, for easy, can make the voltage waveform of the each subfield in horizontal pulse voltage identical with the voltage magnitude of the voltage waveform of subfield corresponding thereto in row pulse voltage.Concrete example, in the present invention, the voltage waveform of each subfield in the S of a horizontal pulse voltage subfield can for high-frequency and high-voltage positive negative pulse stuffing, (a forward voltage pulse in high-frequency and high-voltage positive negative pulse stuffing adds a negative voltage pulse and is called as a pulse pair, can calculate relevant voltage duration length according to frequency and the pulse of the high-frequency and high-voltage positive negative pulse stuffing loading to number.), the high-frequency and high-voltage positive negative pulse stuffing of each subfield has the pulse of setting to number, frequency and voltage magnitude (twice that this voltage magnitude is less than threshold voltage magnitude and this voltage magnitude is greater than threshold voltage magnitude), and the high-frequency and high-voltage positive negative pulse stuffing between different subfields can be identical or different; The voltage waveform of each subfield in the S of a row pulse voltage subfield is that phase place is identical or contrary with the voltage waveform of a subfield corresponding thereto in horizontal pulse voltage, pulse is identical to number, frequency and three parameters of voltage magnitude, and the quantity of the subfield identical with phase place in horizontal pulse voltage and this row pulse voltage in row pulse voltage, pixel GTG value to display that horizontal pulse voltage is corresponding are relevant, that is to say, the GTG value of pixel equals the identical subfield quantity of row, column pulse voltage phase place for showing this pixel.Be described as follows: S subfield can show from 0 to S, S+1 GTG value altogether.For example, totally 31 subfields, so, if the GTG value of pixel actual displayed is 0, the voltage waveform single spin-echo of all subfields in voltage waveform and the horizontal pulse voltage of all subfields in row pulse voltage, if the GTG value of pixel actual displayed is 1, the voltage waveform single spin-echo of corresponding front 30 subfields in the voltage waveform of front 30 subfields in row pulse voltage and horizontal pulse voltage, in row pulse voltage, the voltage waveform of last 1 subfield is identical with the voltage waveform phase place of corresponding last 1 subfield in horizontal pulse voltage, if the GTG value of pixel actual displayed is 15, the voltage waveform single spin-echo of corresponding front 16 subfields in the voltage waveform of front 16 subfields in row pulse voltage and horizontal pulse voltage, the voltage waveform of all the other subfields in row pulse voltage is identical with the voltage waveform phase place of corresponding all the other subfields in horizontal pulse voltage, if the GTG value of pixel actual displayed is 30, the voltage waveform single spin-echo of corresponding front 1 subfield in the voltage waveform of front 1 subfield in row pulse voltage and horizontal pulse voltage, in row pulse voltage, the voltage waveform of all the other subfields is identical with the voltage waveform phase place of corresponding all the other subfields in horizontal pulse voltage.
Known according to above-mentioned explanation, in step D, a column electrode 141 is exported horizontal pulse voltage, each row electrode 151 is modulated according to the pixel corresponding with it GTG value output respective column pulse voltage obtaining after corresponding gray scale correction value and is specially: in a Preset Time, load rows pulse voltage on this column electrode 141, on remaining row electrode 141, load 0V voltage, simultaneously, on each row electrode 151, load respective column pulse voltage: for a pixel of these column electrode 141 correspondences, according to the GTG value after this pixel modulation, in the horizontal pulse voltage that the voltage waveform of the corresponding subfield in the row pulse voltage loading on row electrode 151 corresponding to this pixel is exported with this column electrode 141, identical (pulse is to number for the voltage waveform phase place of corresponding subfield, frequency is also identical, voltage magnitude can be identical or different), in the horizontal pulse voltage that the voltage waveform of all the other subfields is exported with this column electrode 141, (pulse is to number for the voltage waveform single spin-echo of corresponding subfield, frequency is identical, voltage magnitude can be identical or different), wherein: the GTG value after this pixel modulation equals the row for showing this pixel, the subfield quantity that in row pulse voltage, phase place is identical, and, ranks pulse voltage should meet: in horizontal pulse voltage, the voltage magnitude of the voltage waveform of each subfield is less than threshold voltage magnitude, in row pulse voltage, the voltage magnitude of the voltage waveform of each subfield is less than threshold voltage magnitude, in the time that the phase place of subfield in horizontal pulse voltage and a subfield corresponding thereto in row pulse voltage is identical, the voltage magnitude of the voltage waveform obtaining after the voltage waveform stack of this subfield in the voltage waveform of this subfield in this horizontal pulse voltage and this row pulse voltage is less than threshold voltage magnitude, in the time of the single spin-echo of a subfield corresponding thereto in subfield in horizontal pulse voltage and row pulse voltage, the voltage magnitude of the voltage waveform obtaining after the voltage waveform stack of this subfield in the voltage waveform of this subfield in this horizontal pulse voltage and this row pulse voltage is greater than threshold voltage magnitude.
For example, when the voltage waveform of setting the each subfield in horizontal pulse voltage respectively with row pulse voltage in the pulse of voltage waveform of subfield corresponding thereto to number, frequency, when identical the and phase place of voltage magnitude is identical or contrary, on these column electrode 141 positions, need to be driven to the only single spin-echo of horizontal pulse voltage of loading on the row pulse voltage that loads on the row electrode 151 that the pixel (GTG value is S) of all-transparent state is corresponding and this column electrode 141, on these column electrode 141 positions, do not need driven pixel (vaporific lucifuge state while keeping initialization, GTG value is 0) the row pulse voltage that loads on corresponding row electrode 151 is identical with the horizontal pulse voltage of loading on this column electrode 141.
In step D, for a pixel corresponding to column electrode, in the row pulse voltage loading on row electrode corresponding to this pixel, front, the subfield identical with the voltage waveform phase place of the subfield in the horizontal pulse voltage of this column electrode output is rear with the subfield of the voltage waveform single spin-echo of the subfield in the horizontal pulse voltage of this column electrode output.
For example: as shown in Figure 4 and Figure 5, total M the column electrode of smectic liquid crystal display screen 10, each column electrode is divided into W region, and between each column electrode, the pixel quantity of corresponding district inclusion is identical, as Fig. 4.The region GTG value modulometer generating for the region according to dividing shown in Fig. 4 as shown in Figure 5.GTG value apart from the pixel in the nearer region of column electrode exit increases (gray scale correction value for just), GTG value apart from the pixel in column electrode exit region far away reduces (gray scale correction value is for negative), that is to say, along with the increase of column electrode exit distance, the gray scale correction value of the pixel in region diminishes gradually, by just to negative, as Fig. 5.Gray scale correction value in the GTG value modulometer of region is all according to the image that will show and pre-set.For example, in Fig. 5, GTG value (the actual GTG value that will show) after pixel in region 1 is proofreaied and correct is than the original pre-GTG value large 9 showing, GTG value after pixel in the W-2 of region is proofreaied and correct is identical with the original pre-GTG value showing, the GTG value after the pixel in the W of region is proofreaied and correct is less by 2 than the original pre-GTG value showing.
Again for example, as Fig. 6, for being positioned at three pixels adjacent in display screen horizontal direction, the pre-GTG value showing of these three pixels is 7.Because these three pixels are apart from the distance difference of column electrode exit, thereby the factor such as column electrode resistance, the row signal accumulative total GTG effect difference that causes these three pixels of identical image display effect to demonstrate, as shown in the figure in left side in Fig. 6, the image effect that middle pixel shows is the GTG effect that will show in advance, but, the image effect that the pixel on the left side demonstrates is partially darker than the GTG effect that will show in advance, and the image effect that the pixel on the right demonstrates is partially more shallow than the GTG effect that will show in advance.Carry out column region correction by the inventive method, it is 9,6 that the GTG value of above-mentioned left and right pixel is proofreaied and correct respectively, namely the actual GTG value that will show of these three pixels becomes 9,7,6, thereby, the final GTG effect showing of these left and right two pixels has all become the effect that will show in advance, the interactive display original state of intermediary image vegetarian refreshments, as shown in the figure on right side in Fig. 6, three final demonstration GTG effects of pixel have met demonstration requirement.
In the present invention, for a pixel, the physics realization principle that pixel is rendered as all-transparent state (changing to all-transparent state by vaporific shading status) is: control the row that this pixel is corresponding, the pulse voltage waveform of row electrode output (for example, OK, the voltage magnitude of the pulse voltage waveform of row electrode is 100v, the voltage magnitude of the voltage waveform forming after stack is greater than threshold voltage magnitude, OK, the frequency of the pulse voltage waveform of row electrode is 1kHz), when action time is during less than 1 second, smectic phase liquid crystal molecule in corresponding mixolimnion 13 parts of this pixel just becomes regularly arranged form, now, the long optical axis of smectic phase liquid crystal molecule is perpendicular to first, the second conductive electrode layer 14, 15 plane, the refraction of the light of the each smectic phase liquid crystal molecule of incident does not produce acute variation, light can freely see through this mixolimnion part, in macroscopic view, this pixel presents all-transparent state, correspondence arranges the display screen of black backboard, this pixel display effect is black.Vaporific shading status is the state after display screen initialization, pixel keeps the physics realization principle of the vaporific shading status after initialization to be: control the row that this pixel is corresponding, the pulse voltage waveform of row electrode output (for example, OK, the voltage magnitude of the pulse voltage waveform of row electrode is 100v, the voltage magnitude of the voltage waveform forming after stack is less than threshold voltage magnitude, OK, the frequency of the pulse voltage waveform of row electrode is 50Hz), due to row, the voltage magnitude of the voltage waveform forming after the pulse voltage waveform stack of row electrode is less than threshold voltage magnitude, therefore, the arrangement form of the smectic phase liquid crystal molecule in corresponding mixolimnion 13 parts of this pixel can not be affected, can not change, this pixel continues to present vaporific shading status, as acute-matte, correspondence arranges the display screen of black backboard, this pixel display effect is white.
For example there is the pixel of arbitrary GTG value between S and 0, in a certain gray scale states (translucent) between all-transparent and vaporific lucifuge state, the physical arrangement state that this pixel has is to be rendered as the regularly arranged form that the pixel of all-transparent state has and to keep a certain transition arrangement form between out of order arrangement form that the pixel of vaporific shading status has, does not here describe in detail.The physics realization principle that pixel is rendered as all-transparent state, become vaporific shading status and be rendered as gray scale states by all-transparent state separately referenced patent application number is that the Chinese invention patent application " electric-controlled light-regulating medium " that 200710175959.9 Chinese invention patent application " a kind of electric-controlled light-regulating medium " and number of patent application are 200810102000.7 is understood.
Pixel is shown as after white, black or corresponding GTG value, just can remove row, column pulse voltage, pixel can continue to keep, the maintenance of this show state does not need voltage to maintain, remove after voltage, the luminous effect that pixel produces still can keep on-load voltage time, and the voltage signal of effect is just in order to change the arrangement form of smectic phase liquid crystal molecule.In the present invention, this state that does not need electric drive and maintain luminous effect is called to " multistable " or " quasistatic ".And this " multistable " is because additive has adopted the compound with conductive characteristic, in the time that electric signal applies, ion in compound with conductive characteristic changes and produces to-and-fro movement according to electric potential difference, this motion can change the arrangement form of smectic phase liquid crystal molecule, and change after smectic phase Liquid Crystal Molecules Alignment form do not need the persistent movement of ion to maintain, be stable.
In the present invention, threshold voltage is, for smectic phase liquid crystal molecule is driven, the magnitude of voltage that arrangement form changes occurs, and it is to determine according to the composition of mixolimnion and thickness, more than being generally 5V.The frequency of the row, column pulse voltage in step D of the present invention can be made as and be more than or equal to 1kHz and be less than or equal to 10kHz, and voltage magnitude can be made as and be more than or equal to 5v and be less than or equal to 250v, and pulse can be made as and be more than or equal to 1 and be less than or equal to 1000 number.
In reality, according to showing needs, also can be mixed with a certain amount of dichroic dye in mixolimnion 13, like this, smectic liquid crystal display screen just can switch between all-transparent and coloured shading.For having mixed the smectic liquid crystal display screen of dichroic dye, its scanning drive method identical with the smectic liquid crystal display screen of above-mentioned unmixed dichroic dye (its pixel shows that the physics realization principle of image is similar to the smectic liquid crystal display screen of above-mentioned unmixed dichroic dye), here repeats no more.
The advantage that the present invention has is: the inventive method does not need to change existing driving framework, do not need to increase any hardware cost yet, only need set up a region GTG value modulometer, according to pixel region to be shown and this region GTG value modulometer, GTG value to pixel to be shown is proofreaied and correct (changing GTG value size), thereby the region inconsistency in compensation display screen horizontal direction, smectic liquid crystal display screen is shown between the pixel of same gray level value in the horizontal direction consistent, overcome because of column electrode resistance, the defect of the obvious regional difference that the unevenness of row signal accumulative total and display screen itself causes in the horizontal direction to demonstration image, improve the display quality of smectic liquid crystal display screen, avoid image fault phenomenon, effectively improve the homogeneity that image shows.In the present invention, the row pulse voltage of all row outputs is corresponding with row, has guaranteed the correctness that whole screen image shows.
The above is preferred embodiment of the present invention and the know-why used thereof; for a person skilled in the art; in the situation that not deviating from the spirit and scope of the present invention; any apparent change such as equivalent transformation, simple replacement based on technical solution of the present invention basis, within all belonging to protection domain of the present invention.
Claims (10)
1. a column region correction scanning drive method for smectic liquid crystal display screen, this smectic liquid crystal display screen comprises the first base layer and the second base layer, between the first base layer and the second base layer, be provided with a mixolimnion being formed by smectic phase liquid crystal and additives mixed, be provided with the first conductive electrode layer at the first base layer towards a side of mixolimnion, be provided with the second conductive electrode layer at the second base layer towards a side of mixolimnion, the first conductive electrode layer is made up of M the strip line electrode being arranged in parallel, this M column electrode is drawn and is connected to horizontal pulse Voltag driving circuit from the column electrode exit on this smectic liquid crystal display screen left side, the second conductive electrode layer is made up of N the strip row electrode being arranged in parallel, this N row electrode drawn and is connected to row pulse voltage driving circuit from the row electrode leads to client of this smectic liquid crystal display screen top, this M column electrode is mutually orthogonal with N row electrode, form the pixel array of a M × N, it is characterized in that: the method comprises the following steps:
Steps A: initialization smectic liquid crystal display screen;
Step B: every a line of this smectic liquid crystal display screen is divided into multiple regions in the row direction, and each region comprises multiple pixels; According to formation zone, the region GTG value modulometer of dividing;
Step C: select a scan pattern, determine the scanning sequence series corresponding with this scan pattern, this scanning sequence series is by integer 1 to M, and M line number forms altogether, this M line number is by arranging with the corresponding order of this scan pattern;
Step D: read successively each line number from this scanning sequence series; In reading a line number, determine the region under each pixel that the column electrode of this line number representative is corresponding and need the gray scale correction value of modulation by this region GTG value modulometer, thereby this column electrode output horizontal pulse voltage, each row electrode is modulated the GTG value output respective column pulse voltage obtaining after corresponding gray scale correction value according to the pixel corresponding with it;
Step e: in the time having read this scanning sequence series, this first conductive electrode layer and this second conductive electrode layer stop output voltage, and an entire image just shows.
2. column region correct scan driving method as claimed in claim 1, is characterized in that:
The region quantity that each row of described smectic liquid crystal display screen is divided is identical or different;
The every a line in the row direction upper region quantity of dividing is more than or equal to 1 and be less than or equal to
wherein: the subfield quantity that S has for horizontal pulse voltage.
3. column region correct scan driving method as claimed in claim 1 or 2, is characterized in that:
The included pixel quantity of regional that a line on described smectic liquid crystal display screen is divided is identical or different.
4. column region correct scan driving method as claimed in claim 1, is characterized in that:
In described step C, described scan pattern is any in sequential scanning pattern, backward scan pattern, fractional scanning pattern, two points of algorithm scan patterns, random disorder scan pattern line by line.
5. column region correct scan driving method as claimed in claim 1, is characterized in that:
On described smectic liquid crystal display screen each pixel of every a line in the GTG value modulometer of described region to having an affiliated area and a gray scale correction value.
6. column region correct scan driving method as claimed in claim 1, is characterized in that:
In described step D, the pre-GTG value showing of pixel adds that gray scale correction value is the actual GTG value that will show of this pixel; The gray scale correction value of the pixel in the near region of the described column electrode exit of distance is positive integer, and the gray scale correction value of the pixel in the described column electrode exit of distance region far away is negative integer.
7. the column region correct scan driving method as described in claim 1 or 6, is characterized in that:
The row pulse voltage of the horizontal pulse voltage of each described column electrode output and each described row electrode output forms by S subfield, the application time length of each subfield in horizontal pulse voltage is corresponding one by one with the application time length of each subfield in row pulse voltage, and the voltage waveform of each subfield in horizontal pulse voltage respectively with the pulse of the voltage waveform of subfield corresponding thereto in row pulse voltage to number, frequency is identical and phase place is identical or contrary, in horizontal pulse voltage, the voltage magnitude of the voltage waveform of each subfield is less than threshold voltage magnitude, and in row pulse voltage, the voltage magnitude of the voltage waveform of each subfield is less than threshold voltage magnitude, in the time that the phase place of subfield in horizontal pulse voltage and a subfield corresponding thereto in row pulse voltage is identical, the voltage magnitude of the voltage waveform obtaining after the voltage waveform stack of this subfield in the voltage waveform of this subfield in this horizontal pulse voltage and this row pulse voltage is less than threshold voltage magnitude, in the time of the single spin-echo of a subfield corresponding thereto in subfield in horizontal pulse voltage and row pulse voltage, the voltage magnitude of the voltage waveform obtaining after the voltage waveform stack of this subfield in the voltage waveform of this subfield in this horizontal pulse voltage and this row pulse voltage is greater than threshold voltage magnitude.
8. column region correct scan driving method as claimed in claim 7, is characterized in that:
In described step D, a column electrode output horizontal pulse voltage, each row electrode is modulated according to the pixel corresponding with it GTG value output respective column pulse voltage obtaining after corresponding gray scale correction value and is specially:
In a Preset Time, load rows pulse voltage on this column electrode, on remaining row electrode, load 0V voltage, simultaneously, on each row electrode, load respective column pulse voltage: for a pixel corresponding to this column electrode, according to the GTG value after this pixel modulation, in the horizontal pulse voltage of the voltage waveform of the corresponding subfield in the row pulse voltage loading on row electrode corresponding to this pixel and the output of this column electrode, the voltage waveform phase place of corresponding subfield is identical, the voltage waveform single spin-echo of corresponding subfield in the horizontal pulse voltage that the voltage waveform of all the other subfields is exported with this column electrode, wherein: the GTG value after this pixel modulation equals the row for showing this pixel, the subfield quantity that in row pulse voltage, phase place is identical.
9. column region correct scan driving method as claimed in claim 8, is characterized in that:
In described step D, for a pixel corresponding to column electrode, in the row pulse voltage loading on row electrode corresponding to this pixel, front, the subfield identical with the voltage waveform phase place of the subfield in the horizontal pulse voltage of this column electrode output is rear with the subfield of the voltage waveform single spin-echo of the subfield in the horizontal pulse voltage of this column electrode output.
10. column region correct scan driving method as claimed in claim 7, is characterized in that:
The voltage waveform of the each subfield in horizontal pulse voltage respectively with row pulse voltage in the voltage magnitude of voltage waveform of subfield corresponding thereto identical or different.
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| GB201115868D0 (en) | 2011-09-14 | 2011-10-26 | Cambridge Entpr Ltd | Driver circuit |
| CN104658490B (en) * | 2013-11-25 | 2017-06-13 | 苏州汉朗光电有限公司 | Cholesteric liquid crystal display screen scanning drive method |
| CN105913818B (en) * | 2016-06-07 | 2018-06-29 | 深圳市华星光电技术有限公司 | The scan compensation method of gate drivers and scan compensation circuit |
| CN108766370A (en) * | 2018-06-11 | 2018-11-06 | 深圳市国华光电科技有限公司 | A kind of electrowetting drive system and its control method |
| CN111724738B (en) | 2019-03-19 | 2022-02-11 | 矽创电子股份有限公司 | Driving circuit of display panel |
| CN111223440B (en) * | 2020-03-12 | 2023-04-14 | 京东方科技集团股份有限公司 | Gray scale compensation method and device of display panel, controller and display device |
| CN111798804A (en) * | 2020-07-07 | 2020-10-20 | Tcl华星光电技术有限公司 | Active matrix backlight module and driving method thereof |
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