CN100447853C - Gray tone driving method for steady-state - Google Patents
Gray tone driving method for steady-state Download PDFInfo
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- CN100447853C CN100447853C CNB2005101134945A CN200510113494A CN100447853C CN 100447853 C CN100447853 C CN 100447853C CN B2005101134945 A CNB2005101134945 A CN B2005101134945A CN 200510113494 A CN200510113494 A CN 200510113494A CN 100447853 C CN100447853 C CN 100447853C
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Abstract
The invention supplies a bistable nematic LCD gray scale driving method that separates the image to at least one first section image, a second section image and a third section image. The method includes following steps: driving the first section image to drive bistable nematic LCD to a preset state; driving the second section image to write the gray scale image data into pixel; driving the third section image to return the effect voltage to zero and returning the corresponding stable state of corresponding image data. The image data would be updated without electric power. Thus, the power consumption would be decreased.
Description
Technical field
The present invention relates to the GTG driving method of a kind of bistable state to palm property nematic LCD; Particularly relevant for the active GTG driving method of a kind of bistable state to palm property nematic LCD.
Background technology
General known bistable state uses the multitask type of drive of passive matrix pixel to come display frame to palm property nematic LCD more, for many years in order to reach the fast driving effect, and the distinctive character of palm property nematic crystal is developed several diverse ways at bistable state, for example United States Patent (USP) the 5th, 748, the 6th, 204, No. 835 tired driving methods etc. that increase of No. 277 dynamic drive method or United States Patent (USP).Yet, also based on passive matrix in the restriction that drives, make bistable state to resolution, dynamic menu, the display quality of palm property nematic LCD and drive difficult improvement such as cost.
Philip utilization dynamic drive method drives the active-matrix bistable state to palm property nematic LCD, make its pixel design become very complicated for the special waveform that reaches dynamic drive method, United States Patent (USP) the 6th according to the Philip, 703, No. 995 disclosed, its pixel design is the framework of 5T1C, in order to control the transistor of this framework, increase a lot of controlling signal, so design causes the cost of drive system to increase, the pixel design complexity, thereby may reduce yield, and a plurality of transistor and electric capacity makes pixel inner opening rate reduce, influence display quality.
In addition, the United States Patent (USP) the 6th of Toshiba, 052, No. 103 bistable state taked traditional design to the pixel structure of palm property nematic crystal, during an addressing drives, in pixel electrode, write the driving voltage waveform of different conditions, owing to drive the needed transition time of each state more than long to this pixel electrode charging required time, cause the driving time of said method long, especially after exploration on display resolution ratio increases, the time that make to drive is oversize and lose animate, or even the picture quality degradation of skipping.
Summary of the invention
Fundamental purpose of the present invention is to provide the active GTG driving method of a kind of bistable state to palm property nematic LCD, and it can shorten the active-matrix bistable state to the driving time of palm property nematic LCD and improve exploration on display resolution ratio.
Another object of the present invention is to provide the GTG driving method of a kind of bistable state to palm property nematic LCD, its pixel design is adopted the 1T1C framework, can increase the aperture opening ratio in the pixel, and then promotes display quality.
Another purpose of the present invention is to provide a kind of method of continuous frame update, can reach the purpose of upgrading animation.
For achieving the above object, bistable state provided by the invention is divided into one first section picture, one second section picture and one the 3rd section picture to the GTG driving method of palm property nematic LCD with a frame update, and this method comprises:
Drive this first section picture, drive bistable state the default original state of palm property nematic crystal to;
Drive this second section picture, write in the pixel with the grey menu data of desire being upgraded by the line sweep mode; And
Drive the 3rd section picture, the effect voltage of these pixels is made zero, so that this bistable state returns back to the stable state that writes this grey menu data correspondence to palm property nematic crystal.
Described bistable state is to the GTG driving method of palm property nematic LCD, wherein drive the blank time (a blank time) that continues after the step of this second section picture, as driving time buffering so that this bistable state to the abundant transition of palm property nematic crystal to the stable state that writes this grey menu data correspondence.
Described bistable state is to the GTG driving method of palm property nematic LCD, the step that wherein drives this first section picture this bistable state of resetting simultaneously becomes homeotropic alignment (Homeotropic) state to palm property nematic crystal, to eliminate the data memory in the pixel.
Described bistable state is to the GTG driving method of palm property nematic LCD, and the step that wherein drives this first section picture is that this bistable state is urged to a scattering states (focalconic state) to palm property nematic crystal, to be made for this default original state.
Described bistable state is to the GTG driving method of palm property nematic LCD, the step that wherein drives this first section picture be drive simultaneously this bistable state to palm property nematic crystal to this scattering states (focal conic state).
Described bistable state is to the GTG driving method of palm property nematic LCD, the step that wherein drives this first section picture be with drive by the line sweep mode this bistable state to palm property nematic crystal to this scattering states (focal conic state).
Described bistable state is to the GTG driving method of palm property nematic LCD, and the step that wherein drives this first section picture is that this bistable state is urged to a reflection attitude (planarstate) to palm property nematic crystal, to be made for this default original state.
Described bistable state is to the GTG driving method of palm property nematic LCD, and the data that write that wherein drive this second section picture comprise at least one position, with the combination of correspondence reflection attitude and scattering states.
Described bistable state is to the GTG driving method of palm property nematic LCD, and the output voltage that wherein drives this second section picture is the combination of corresponding reflection attitude and scattering states.
Described bistable state is to the GTG driving method of palm property nematic LCD, and the step that wherein drives the 3rd section picture is simultaneously these pixel effect voltages to be made zero.
Described bistable state is to the GTG driving method of palm property nematic LCD, and the step that wherein drives the 3rd section picture is with scan mode these pixel effect voltages to be made zero.
Described bistable state is to the GTG driving method of palm property nematic LCD, and wherein this driving method comprises reverse function, and driving voltage is changed.
Described bistable state is to the GTG driving method of palm property nematic LCD, and wherein this driving method comprises reverse function, and the image sign indicating number is reversed.
The method of continuous frame update provided by the invention, wherein each this frame update is divided into one first section picture, one second section picture and one the 3rd section picture, this first section picture drives bistable state to the default original state of palm property nematic crystal to, this second section picture writes in the pixel with the grey menu data of desire being upgraded by the line sweep mode, and the 3rd section picture make zero the effect voltage of these pixels, so that this bistable state returns back to the stable state that writes this grey menu data correspondence to palm property nematic crystal; The method of this continuous frame update comprises:
Drive this first section picture, this second section picture and the 3rd section picture of each this frame update in regular turn, when driving last frame update, drive this first section picture, this second section picture and the 3rd section picture of aforementioned last frame update, so that these pixel effect voltages are made zero.
The method of continuous frame update provided by the invention, wherein each this frame update is divided into one first section picture, one second section picture and one the 3rd section picture, this first section picture drives bistable state to the default original state of palm property nematic crystal to, this second section picture writes in the pixel with the grey menu data of desire being upgraded by the line sweep mode, reach the 3rd section picture and do not change these pixel voltages, the data that this second picture is write return back to corresponding stable state and keep the display quality of image; The method of this continuous frame update comprises:
Drive this first section picture, this second section picture and the 3rd section picture of each this frame update in regular turn, when driving last frame update, drive this first section picture, this second section picture and the 3rd section picture of aforementioned last frame update, these pixel effect voltage can be made zero at last.
Preferably, during second section picture of this of aforementioned each frame update, it writes the magnitude of voltage of magnitude of voltage for reflection attitude and scattering states combination, is called gray scale voltage.
Description of drawings
Fig. 1 is the driving circuit synoptic diagram of bistable state of the present invention to palm property nematic LCD;
Fig. 2 A drives interval pixel effect voltage synoptic diagram for each picture in first specific embodiment of driving method of the present invention;
Fig. 2 B drives interval pixel effect voltage synoptic diagram for each picture in second specific embodiment of driving method of the present invention;
Fig. 3 is a kind of gamma curve figure of the cholesterol liquid crystal of the present invention's use;
Fig. 4 is the another kind of gamma curve figure of the cholesterol liquid crystal of the present invention's use;
Fig. 5 is the photoelectricity figure of the cholesterol liquid crystal of the present invention's use;
Fig. 6 A drives interval pixel effect voltage synoptic diagram for each picture in the 3rd specific embodiment of driving method of the present invention;
Fig. 6 B drives interval pixel effect voltage synoptic diagram for each picture in the 4th specific embodiment of driving method of the present invention;
Fig. 7 A drives interval pixel effect voltage synoptic diagram for each picture in the 5th specific embodiment of driving method of the present invention;
Fig. 7 B drives interval pixel effect voltage synoptic diagram for each picture in the 6th specific embodiment of driving method of the present invention;
Fig. 7 C drives interval pixel effect voltage synoptic diagram for each picture in the 7th specific embodiment of driving method of the present invention;
Fig. 8 A drives interval pixel effect voltage synoptic diagram for each picture in the 8th specific embodiment of driving method of the present invention;
Fig. 8 B drives interval pixel effect voltage synoptic diagram for each picture in the 9th specific embodiment of driving method of the present invention; And
Fig. 9 is the another kind of photoelectricity figure of the cholesterol liquid crystal of the present invention's use.
Embodiment
Bistable state of the present invention comprises a plurality of pixel electrodes that constitute with the active-matrix form to palm property nematic LCD, one shared electrode towards these pixel electrodes, one display dielectric layer such as bistable state are sandwiched between these pixel electrodes and this shared electrode palm property nematic crystal layer, form a plurality of pixel capacitances by these pixel electrodes, this display dielectric layer and shared electrode, a plurality of switches are connected to these corresponding pixel electrodes, to drive these pixel electrodes.Among the present invention, each pixel can comprise a storage capacitors, to stablize the voltage of this pixel.When data writes these pixel electrodes, these pixel capacitances and this storage capacitors are discharged and recharged, make the current potential of the data of desiring to write be maintained at this pixel capacitance and this storage capacitors, be sandwiched in therebetween display medium with the electric field driven in these pixel capacitances, by driven this display medium light is carried out modulation, to reach the purpose that shows these data.
Clearer and more definite, bistable state of the present invention is that pixel design is become the 1T1C framework to palm property nematic LCD, and 1T is the minimum driving component that traditional active-matrix LCD should possess, as addressing and non-addressing switch.This 1C is the passive component that traditional active-matrix LCD often possesses, as storage capacitors, as capacitance stable and the adjustment pixel, to reduce the drift of pixel voltage.
Fig. 1 is the driving circuit synoptic diagram of bistable state of the present invention to palm property nematic LCD.Consult shown in Figure 1ly, bistable state of the present invention comprises that to palm property nematic LCD 1 one first substrate 10, one second substrate 20, a bistable state are to palm property nematic liquid crystalline material layer (not shown), several column electrode (not shown), plural column electrode (not shown), community electrode 202, a plurality of sweep traces Y
1, Y
2, Y
3...., Y
n, a plurality of signal line X
1, X
2, X
3, X
4...., X
m, a plurality of switch modules 300, a plurality of capacitance component 304, one scan line drive 40, a signal line driver 50, a selector switch 60, a picture controller 70 and a voltage source of supply 80.This first substrate 10 has one first first type surface 100, and these row electrodes and column electrode (not shown) are formed on this first first type surface of this first substrate 10 100 with matrix-style.This second substrate 20 has one second first type surface, 200 relative these first first type surfaces 100, and this common electrode 202 is formed at this second first type surface 200 of this second substrate 20, so that these common electrode 202 relative these row electrode and column electrodes.This bistable state is to palm property nematic liquid crystalline material layer, cholesteric liquid crystal material layer for example, between this first substrate 10 and this second substrate 20, wherein corresponding each this row electrode of this liquid crystal material layer and each this column electrode infall constitute a pixel 30, this pixel 30 forms a pixel capacitance 302, and an end of this pixel capacitance 302 is connected in this common electrode 202, and the other end constitutes a pixel electrode.These sweep traces Y
1, Y
2, Y
3...., Y
nAnd these signal line X
1, X
2, X
3, X
4...., X
mSystem is on this first first type surface 100 that the arranged mode is formed at this first substrate 10 jointly, and this sweep trace correspondence one of each bar is listed as this row electrode, and this column electrode of the corresponding delegation of this signal line of each bar.Each this switch module 300, for example transistor is formed at each this row electrode and each this column electrode infall, for the driving switch of doing this corresponding pixel 30.This switch module 300 comprises a conducting approach 300a and and controls end points 300b to control the conducting of this conducting approach 300a, this control end points 300b is connected to corresponding this sweep trace, this conducting approach 300a comprises one first end points 300c and one second end points 300d, and this first end points 300c is connected to this signal line and this second end points is connected to corresponding this pixel electrode.These capacitance components 304 are formed on this first first type surface 100 of this first substrate 10, each these capacitance component 304 corresponding these pixel 30, one end of this capacitance component 304 is connected to corresponding this pixel electrode, but and other end ground connection or be connected to one just or a negative voltage.The other end of this capacitance component 304 can cooperate common electrode voltage and be connected to negative voltage to reduce the ceiling voltage of system, reduces this switch module 300 as the transistorized voltage that bears in this pixel 30 simultaneously, to keep this characteristics of transistor degree of stability.This capacitance component 304 is as capacitance stable and this pixel 30 that adjustment is corresponding, to reduce the drift of pixel voltage.This scan line driver 40 is supplied at least, and the one scan signal gives this sweep trace of each bar.At least one data signals of these signal line driver 50 supplies is given this signal line of each bar.This selector switch 60 connects these signal line driver 50 output terminals and this power supply unit 80 as input voltage and be connected these signal line X
1, X
2, X
3, X
4..., X
mExport as voltage.This selector switch 60 selects input voltage to be provided by this power supply unit 80 or provided by this signal line driver 50 by control pin (not shown) input controlling signal, and conducts to these signal line X
1, X
2, X
3, X
4..., X
mThe controlling signal of this control pin of this selector switch 60 is provided by this picture controller 70.This power supply unit 80 is supplied individual voltages respectively and is given this scan line driver 40, this signal line driver 50, this selector switch 60 and this common electrode 202.This picture controller 70 is in order to store and to handle image information, with the output of this image information and control this signal driver 50 with the output voltage signal, simultaneously, the output controlling signal is controlled this scan line driver 40 with the output scanning signal, again simultaneously, the output controlling signal makes the required various voltages of these power supply unit 80 outputs to control the effect voltage swing of each this pixel to this power supply unit 80.
A kind of bistable state provided by the invention is to the active GTG driving method of palm property nematic LCD, be that a frame update is divided into one first section picture, one second section picture and one the 3rd section picture, this method comprises this first section picture of driving, drives bistable state to the default original state of palm property nematic crystal to; Drive this second section picture, write in the pixel with the grey menu data of desire being upgraded by the line sweep mode; And drive the 3rd section picture, the effect voltage of these pixels is made zero, so that this bistable state returns back to the stable state that writes this grey menu data correspondence to palm property nematic crystal.Drive during aforementioned first section picture, can simultaneously this bistable state be reset to homeotropic alignment attitude (horneotropic state) to palm property nematic crystal, to eliminate the data memory in the pixel.In addition, also this bistable state can be urged to reflection attitude (planar state) or scattering states (focal conicstate) to palm property nematic crystal, with as default original state.When with the reflection attitude during as default initial state, earlier this bistable state is urged to the homeotropic alignment attitude to palm property nematic crystal, be driven into the reflection attitude again, the blank time (a front blank time) before one that continues after afterwards can be during this first section picture is so that transition is the turnaround time (relaxation time) of reflection attitude as the homeotropic alignment attitude.Drive during this second section picture, its magnitude of voltage that writes is the combination voltage value of reflection attitude and scattering states, to show the GTG value, or the magnitude of voltage of homeotropic alignment attitude and scattering states combination, with default GTG value, but the back blank time (a rear blank time) that can continue after driving this second section picture is so that transition is the transition time (transition time) of reflection attitude as the homeotropic alignment attitude.During this second section picture, the grey menu data that the magnitude of voltage that writes upgrades according to desire are decided.During the 3rd section picture, the voltage that display pannel is required makes zero, being about to all pixels makes zero, so that the power consumption of display pannel reduces to zero, and after the 3rd section picture opened, because bistable state is to the characteristic of palm property nematic crystal itself, this bistable state can return back to the stable state of the luma data correspondence that writes, the i.e. stable state of second section picture correspondence to palm property nematic crystal.So, the pixel effect voltage of this first section picture and the 3rd section picture is to decide voltage individually, the pixel effect voltage of this second section picture is then decided according to the grey menu data that write, this first section picture and the 3rd section picture indivedual decide voltage to be provided by this power supply unit 80, and the pixel effect voltage of this second section picture is provided by this signal line driver 50.In other words, the data voltage of this first section picture, this second section picture and the 3rd section picture is by these selector switch 60 controls.Some driver can be exported simultaneously and decide voltage individually, therefore need not to use this selector switch 60 also can reach identical driving effect.
Bistable state of the present invention is distinguished corresponding pixel effect voltage shown in Fig. 2 A to first section picture, second section picture and the 3rd section picture in first specific embodiment of the GTG driving method of palm property nematic LCD.During this first section picture, this bistable state of resetting simultaneously becomes the homeotropic alignment attitude to palm property nematic crystal, to eliminate the data memory in the pixel, promptly smears and writes the original picture data.During this second section picture, write in the pixel with the grey menu data of desire being upgraded by the line sweep mode, just this bistable state is urged to a kind of composite state that reflects attitude and scattering states that should the grey menu data palm property nematic crystal.During this second section picture, utilize the hysteresis characteristic of this bistable state to palm property nematic crystal, this bistable state is urged to a specific reflection attitude and the composite state of scattering states to palm property nematic crystal, to show predetermined GTG value { Gi}.For example can utilize Fig. 5 photoelectricity figure bend L
1Shown cholesterol liquid crystal hysteresis characteristic drives a kind of composite state that reflect attitude and scattering states of this cholesterol liquid crystal to corresponding one predetermined GTG value.Fig. 3 is corresponding diagram 5 oblique line L
1Gamma curve figure, wherein Fig. 3 left side demonstrate various GTG values (G1, G2 ...., G8) with the corresponding relation of pixel drive voltage, and Fig. 3 right side shows the corresponding relation of these pixel drive voltage and image sign indicating number (code).In other words, the writing data and can comprise plural character (plural image sign indicating number) of this second section picture is with the composite state of aforementioned reflection attitude of correspondence and scattering states.In addition, for example can utilize the photoelectricity figure bend L of Fig. 5
2The cholesterol liquid crystal hysteresis characteristic that shows drives a kind of composite state that reflect attitude and scattering states of this cholesterol liquid crystal to corresponding one predetermined GTG value.Fig. 4 is corresponding diagram 5 oblique line L
2Gamma curve figure, wherein Fig. 4 left side demonstrate various GTG values (G1, G2 ...., G8) with the corresponding relation of pixel drive voltage, and Fig. 4 right side shows the corresponding relation of these pixel drive voltage and image sign indicating number (code).During this three-picture, the effect voltage of these pixels is made zero in system, this moment since this bistable state to the characteristic of palm property nematic crystal itself, this bistable state can return back to the reflection attitude of these grey menu data that correspondence writes and the composite state of scattering states to palm property nematic crystal.During the 3rd section picture, can simultaneously all pixel effect voltages be made zero or all pixel effect voltages be made zero to pursue the line sweep mode.And, make this display pannel keep voltage and make zero, and then make this display pannel behind frame updating, reach not power consumption fully by all pixel effect voltages are made zero.
Fig. 2 B shows that bistable state of the present invention drives the pixel effect voltage of period to each picture in second specific embodiment of the GTG driving method of palm property nematic LCD.This second specific embodiment and this first specific embodiment do not exist together and only be to continue a back blank time t behind second section pictures
2b, with as this bistable state to the transition of palm property nematic crystal to corresponding GTG value { the transition time of the reflection attitude of Gi} and the composite state of scattering states that writes.
Bistable state of the present invention also comprises the reversal of poles function to the GTG driving method of palm property nematic LCD, to keep this bistable state stablizing palm property nematic crystal characteristic.Each picture drives the pixel effect voltage of period in the 3rd specific embodiment of Fig. 6 A demonstration the inventive method.During first section picture, the effect voltage Vcom (-) of this common electrode is the H volt, and the effect voltage of bestowing at these pixel electrodes is zero volt, so that the effect voltage of bestowing in these pixels is-the H volt, that is to say, during this first section picture, will this bistable state be urged to the homeotropic alignment attitude simultaneously to palm property nematic crystal.During second section picture, be still and utilize this oblique line of Fig. 5 L
1Shown liquid crystal hysteresis characteristic drives this bistable state, and { a kind of composite state that reflects attitude and scattering states of Gi} is joined the gamma curve of Fig. 3, again according to this gamma curve figure to a corresponding GTG value to palm property nematic crystal, GTG value G1, G2, G3, ..., G8 is respective pixel effect voltage V1 respectively, V2, V3 ... Vi ..., V8, and these pixel effect voltages are linear, i.e. Vi=V1+ (i-1) Δ V, and its corresponding reversal voltage { Vi
*If }=V0-{Vi} establishes V0=V1+V8, then V1
*=V8, V2
*=V7, V3
*=V6 ...., V8
*=V1.Thus, when carrying out this reversal of poles function, can use one group of pixel effect voltage { V1, V2, V3, V4, V5, V6, V7, V8} being same as Fig. 2 A.If if V0=V8, then V1
*=V8-V1 ...., V8
*=V8-V8=0 when then carrying out this reversal of poles function, needs to use a different set of pixel effect voltage in addition, but minimum zero volt of reducing to of its pixel effect voltage.In addition, also can utilize this oblique line of Fig. 5 L
2Shown liquid crystal hysteresis characteristic drives this bistable state, and { a kind of composite state that reflects attitude and scattering states of Gi} is joined the gamma curve of Fig. 3, again according to this gamma curve figure to a corresponding GTG value to palm property nematic crystal, GTG value G1, G2, G3, ..., Gi ..., G8 is respective pixel effect voltage V1 respectively, V2, V3, ... Vi ..., V8, and these pixel effect voltages are linear, i.e. Vi=V1+ (i-1) Δ V, and its corresponding reversal voltage { Vi
*If }=V0-{Vi} establishes V0=V1+V8, then V1
*=V8, V2
*=V7, V3
*=V6 ...., V8
*=V1.Thus, when carrying out this reversal of poles function, can use one group of pixel effect voltage { V1, V2, V3, V4, V5, V6, V7, V8} being same as Fig. 2 A.If if V0=V8, then V1
*=V8-V1 ...., V8
*=V8-V8=0 when then carrying out this reverse function, needs to use a different set of pixel effect voltage in addition, but minimum zero volt of reducing to of its pixel effect voltage.
During the 3rd section picture, similarly be simultaneously or these pixel effect voltages being made zero, so that this bistable state returns back to the stable state of the GTG value correspondence that this second section picture write to palm property nematic crystal by the line sweep mode.
Each picture drives the pixel effect voltage of period in the 4th specific embodiment of Fig. 6 B demonstration the inventive method.The 4th specific embodiment is different with the 3rd specific embodiment to be in a blank time (a blank time) t that continues behind this second section picture
2b, with as this bistable state to the transition time of palm property nematic crystal transition to the composite state of the reflection attitude of the corresponding GTG value that writes and scattering states.
Each picture drives the pixel effect voltage of period in the 5th specific embodiment of Fig. 7 A demonstration the inventive method.During first section picture, with this bistable state to palm property nematic crystal simultaneously or being urged to scattering states (focal conic state), with as default original state by the line sweep mode.During second section picture, utilize the photoelectricity figure bend L of Fig. 9
3Shown bistable state drives this liquid crystal to a kind of specific vertical attitude and the composite state of scattering states to the photoelectric characteristic of palm property nematic crystal, to show corresponding GTG value.In other words, during this second section picture, utilize this oblique line L
3The liquid crystal photoelectric characteristic that shows is to drive this bistable state to palm property nematic crystal by the line sweep mode.During the 3rd section picture, simultaneously or to make zero by the effect voltage of line sweep mode with these pixels.Each picture drives the pixel effect voltage of period in the 6th specific embodiment of Fig. 7 B demonstration the inventive method.The 6th specific embodiment is different with the 5th specific embodiment to be in the blank time t that continues behind second section picture
2b, with as this bistable state to the transition of palm property nematic crystal to corresponding GTG value { the transition time of the vertical attitude of Gi} and the composite state of scattering states that writes.
Each picture drives the pixel effect voltage of period in the 7th specific embodiment of Fig. 7 C demonstration the inventive method.During first section picture, simultaneously this bistable state is urged to this scattering states to palm property nematic crystal, and preceding blank time (a front blank time) t that continues
1b, with as this bistable state to the transition time of palm property nematic crystal transition to this scattering states.During second section picture, utilize this oblique line L among the photoelectricity figure of Fig. 9
3Shown bistable state drives this liquid crystal to a kind of specific vertical attitude and the composite state of scattering states to the photoelectric characteristic of palm property nematic crystal, to show corresponding GTG value.In other words, during this second section picture, be to utilize this oblique line L
3The liquid crystal photoelectric characteristic that shows is to drive this bistable state to palm property nematic crystal by the line sweep mode.And the back blank time (a rear blank time) that behind this second section picture, continues, with as this bistable state to the transition time of palm property nematic crystal transition to the composite state of aforementioned vertical attitude and scattering states.During the 3rd section picture, then simultaneously or to pursue the line sweep mode these pixel effect voltages are made zero.
Each picture drives the pixel effect voltage of period in the 8th specific embodiment of Fig. 8 A demonstration the inventive method, in the 8th specific embodiment, driving method of the present invention is to carry out the reversal of poles function, during first section picture, the voltage Vcom (-) that bestows at this common electrode is the Fc volt, and the effect voltage of bestowing at these pixel electrodes is zero volt, so that these pixel effect voltages are-the Fc volt.In other words, during first section picture, simultaneously or to pursue the line sweep mode this bistable state is urged to scattering states to palm property nematic crystal.During second section picture, then this bistable state is urged to a specific reflection attitude and the composite state of scattering states to palm property nematic crystal, to show the GTG value { Gi} of correspondence by the line sweep mode.During the 3rd section picture, simultaneously or to pursue the line sweep mode these pixel effect voltages are made zero.Each picture drives the pixel effect voltage of period in the 9th specific embodiment of Fig. 8 B demonstration the inventive method, in the 9th specific embodiment, driving method of the present invention is to carry out reverse function, the 9th specific embodiment is different with the 8th specific embodiment to be in the blank time (a blank time) that continues behind this second section picture, with as this bistable state to the transition of palm property nematic crystal to aforementioned GTG value { the transition time of the reflection attitude of Gi} correspondence and the composite state of scattering states.
The present invention provides a kind of method of continuous frame update in addition, wherein each this frame update is divided into one first section picture, one second section picture and one the 3rd section picture, this first section picture drives bistable state to the default original state of palm property nematic crystal to, this second section picture writes in the pixel with the grey menu data of desire being upgraded by the line sweep mode, and the corresponding a kind of composite state that reflects attitude and scattering states of the magnitude of voltage that these two sections pictures write, and the 3rd section picture makes zero the effect voltage of these pixels, so that this bistable state returns back to the stable state that writes this grey menu data correspondence to palm property nematic crystal, or not changing these pixel voltages, the data that this second section picture write return back to corresponding stable state and keep the display quality of image; The method of this continuous frame update comprises: this first section picture, this second section picture and the 3rd section picture of driving each this frame update in regular turn make zero these pixel effect voltages at last until driving last frame update.Method by continuous frame update of the present invention can reach the purpose of upgrading animation.
The above is specific embodiments of the invention only, is not in order to limit claim of the present invention; All other do not break away from the equivalence of being finished under the disclosed spirit and changes or modification, all should be included in the claim.
Claims (15)
1. a bistable state is divided into one first section picture, one second section picture and one the 3rd section picture to the GTG driving method of palm property nematic LCD with a frame update, and this method comprises:
Drive this first section picture, drive bistable state the default original state of palm property nematic crystal to;
Drive this second section picture, write in the pixel with the grey menu data of desire being upgraded by the line sweep mode; And
Drive the 3rd section picture, the effect voltage of these pixels is made zero, so that this bistable state returns back to the stable state that writes this grey menu data correspondence to palm property nematic crystal.
2. bistable state as claimed in claim 1 is to the GTG driving method of palm property nematic LCD, it is characterized in that, wherein drive the blank time that continues after the step of this second section picture, as driving time buffering so that this bistable state to the abundant transition of palm property nematic crystal to the stable state that writes this grey menu data correspondence.
3. bistable state as claimed in claim 1 is to the GTG driving method of palm property nematic LCD, it is characterized in that, the step that wherein drives this first section picture this bistable state of resetting simultaneously becomes the homeotropic alignment state to palm property nematic crystal, to eliminate the data memory in the pixel.
4. bistable state as claimed in claim 1 is to the GTG driving method of palm property nematic LCD, it is characterized in that, the step that wherein drives this first section picture is that this bistable state is urged to a scattering states to palm property nematic crystal, to be made for this default original state.
5. bistable state as claimed in claim 4 is characterized in that the GTG driving method of palm property nematic LCD, the step that wherein drives this first section picture be drive simultaneously this bistable state to palm property nematic crystal to this scattering states.
6. bistable state as claimed in claim 4 is characterized in that the GTG driving method of palm property nematic LCD, the step that wherein drives this first section picture be with drive by the line sweep mode this bistable state to palm property nematic crystal to this scattering states.
7. bistable state as claimed in claim 1 is to the GTG driving method of palm property nematic LCD, it is characterized in that, the step that wherein drives this first section picture is that this bistable state is urged to a reflection attitude to palm property nematic crystal, to be made for this default original state.
8. bistable state as claimed in claim 1 is characterized in that to the GTG driving method of the palm property nematic LCD data that write that wherein drive this second section picture comprise at least one position, with the combination of correspondence reflection attitude and scattering states.
9. bistable state as claimed in claim 1 is characterized in that to the GTG driving method of the palm property nematic LCD output voltage that wherein drives this second section picture is the combination of corresponding reflection attitude and scattering states.
10. bistable state as claimed in claim 1 is characterized in that to the GTG driving method of the palm property nematic LCD step that wherein drives the 3rd section picture is simultaneously these pixel effect voltages to be made zero.
11. bistable state as claimed in claim 1 is characterized in that to the GTG driving method of the palm property nematic LCD step that wherein drives the 3rd section picture is by the line sweep mode these pixel effect voltages are made zero.
12. bistable state as claimed in claim 1 is characterized in that to the GTG driving method of palm property nematic LCD wherein this driving method comprises reverse function, and driving voltage is changed.
13. bistable state as claimed in claim 1 is characterized in that to the GTG driving method of palm property nematic LCD wherein this driving method comprises reverse function, and the image sign indicating number is reversed.
14. the method for a continuous frame update, wherein each this frame update is divided into one first section picture, one second section picture and one the 3rd section picture, this first section picture drives bistable state to the default original state of palm property nematic crystal to, this second section picture writes in the pixel with the grey menu data of desire being upgraded by the line sweep mode, and the 3rd section picture make zero the effect voltage of these pixels, so that this bistable state returns back to the stable state that writes this grey menu data correspondence to palm property nematic crystal; The method of this continuous frame update comprises:
Drive this first section picture, this second section picture and the 3rd section picture of each this frame update in regular turn, when driving last frame update, drive this first section picture, this second section picture and the 3rd section picture of aforementioned last frame update, so that these pixel effect voltages are made zero.
15. the method for a continuous frame update, wherein each this frame update is divided into one first section picture, one second section picture and one the 3rd section picture, this first section picture drives bistable state to the default original state of palm property nematic crystal to, this second section picture writes in the pixel with the grey menu data of desire being upgraded by the line sweep mode, reach the 3rd section picture and do not change these pixel voltages, the data that this second section picture write return back to corresponding stable state and keep the display quality of image; The method of this continuous frame update comprises:
Drive this first section picture, this second section picture and the 3rd section picture of each this frame update in regular turn, when driving last frame update, drive this first section picture, this second section picture and the 3rd section picture of aforementioned last frame update, these pixel effect voltage can be made zero at last.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB2005101134945A CN100447853C (en) | 2005-10-14 | 2005-10-14 | Gray tone driving method for steady-state |
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| Application Number | Priority Date | Filing Date | Title |
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| CNB2005101134945A CN100447853C (en) | 2005-10-14 | 2005-10-14 | Gray tone driving method for steady-state |
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| CN1949348A CN1949348A (en) | 2007-04-18 |
| CN100447853C true CN100447853C (en) | 2008-12-31 |
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| CN102402032A (en) * | 2010-09-16 | 2012-04-04 | 财团法人工业技术研究院 | Drive method of active matrix bistable liquid crystal display |
| TW201234332A (en) * | 2011-02-01 | 2012-08-16 | Ind Tech Res Inst | Bi-stable active matrix display apparatus and method for driving display panel thereof |
Citations (4)
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|---|---|---|---|---|
| CN1437181A (en) * | 2002-02-06 | 2003-08-20 | 内莫普蒂公司 | Double-steady state liquid crystal display screen apparatus and its addressing method |
| US20040145548A1 (en) * | 2003-01-28 | 2004-07-29 | Kent Displays Incorporated | Waveform sequencing method and apparatus for a bistable cholesteric liquid crystal display |
| CN1589463A (en) * | 2001-11-22 | 2005-03-02 | 皇家飞利浦电子股份有限公司 | Bistable liquid crystal device having two drive modes |
| US20050174317A1 (en) * | 2004-02-10 | 2005-08-11 | Konica Minolta Holdings, Inc. | Liquid crystal display apparatus |
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Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1589463A (en) * | 2001-11-22 | 2005-03-02 | 皇家飞利浦电子股份有限公司 | Bistable liquid crystal device having two drive modes |
| CN1437181A (en) * | 2002-02-06 | 2003-08-20 | 内莫普蒂公司 | Double-steady state liquid crystal display screen apparatus and its addressing method |
| US20040145548A1 (en) * | 2003-01-28 | 2004-07-29 | Kent Displays Incorporated | Waveform sequencing method and apparatus for a bistable cholesteric liquid crystal display |
| US20050174317A1 (en) * | 2004-02-10 | 2005-08-11 | Konica Minolta Holdings, Inc. | Liquid crystal display apparatus |
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