CN100353413C - Liquid crystal driving system and method - Google Patents
Liquid crystal driving system and method Download PDFInfo
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- CN100353413C CN100353413C CNB2005101070322A CN200510107032A CN100353413C CN 100353413 C CN100353413 C CN 100353413C CN B2005101070322 A CNB2005101070322 A CN B2005101070322A CN 200510107032 A CN200510107032 A CN 200510107032A CN 100353413 C CN100353413 C CN 100353413C
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Abstract
The present invention relates to a liquid crystal driving method which comprises the following steps: a) receiving an image signal, and the value is selected from a first group of gray scale values; b) comparing the current frame with the previous frame of the image signal in order to judge the static state or the dynamic state is between the current frame and the previous frame; c) in the static state, converting the image signal into a driving signal, the value of the driving signal is selected from a second group of gray scale values, the second group of the gray scale values have grey scale with at least one decimal point, and the number of the second group of gray scale is the same as the first group of the grey scale; d) in the dynamic state, computing an over voltage driving signal, and the value of the over voltage driving signal is selected from the first group of the gray scale values.
Description
Technical field
The present invention is about a kind of liquid crystal drive system, particularly about a kind of drive system and method thereof of liquid crystal panel.
Background technology
The main advantage of LCD is to reach easily high display resolution and display slimming, therefore widely be used in the mobile computer, recent lasting exploitation along with large size panel, LCD also becomes the main flow of desktop PC display, and LCD TV also becomes the much-sought-after item in the television product.
Please refer to Fig. 1, Fig. 1 is the parent map of LCD 10.Wherein, liquid crystal panel 12 has a plurality of pixel cells (pixel) 121, by the liquid crystal molecule in each pixel cell 121 is bestowed specific voltage, then can change the anglec of rotation of liquid crystal molecule, thus, the light that the backlight 14 of liquid crystal panel 12 belows is provided has different transmissivities in the different pixel cell 121 of liquid crystal panel 12, the pixel cell 121 of array then and then interweave and form the frame (frame) that is available for users to watch.If trickleer differentiation, then each pixel cell 121 can be divided into three sub-pixels (sub-pixel) 121R, 121G and 121B, to wield redness, green and the blue composition in each pixel cell 121 respectively.
A lcd technology technical bottleneck wherein, it is relevant with the physical characteristics of liquid crystal molecule: because liquid crystal molecule receives after the above-mentioned specific voltage, need one period reaction time, to rotate to another angle (with the corresponding angle of this specific voltage) from an original angle.And when showing dynamic image, the reaction time of liquid crystal molecule is had enough time the renewal rate of frame, causes the delay or the distortion shortcoming of display quality.Therefore, how to shorten the reaction time of liquid crystal molecule, be the important topic in the lcd technology.
" liquid crystal superpotential Driving technique (LCD overdrive) " is for being used for shortening a kind of method in liquid crystal reaction time, its principle makes liquid crystal molecule rotate to required angle in the preset time interval by the voltage of painstakingly bestowing liquid crystal molecule one too high (or low excessively).Below will liquid crystal superpotential Driving technique be described by Fig. 2, the longitudinal axis is represented the angle of liquid crystal molecule rotation among Fig. 2, and transverse axis is a time shaft; As shown in Figure 2, when bestowing liquid crystal cells one control voltage V
CLThe time, liquid crystal molecule needs elapsed time t2 just to be able to by angle θ
0Rotate to and control voltage V
CLCorresponding angle θ
1, and liquid crystal superpotential Driving technique is bestowed the too high superpotential V of liquid crystal cells one in advance
OD(V
ODBe angle θ
2Control voltage), make liquid crystal molecule when time t1, rotate to angle θ ahead of time
1, then can shorten reaction time of liquid crystal thus.
Please refer to Fig. 3, Fig. 3 shows a known liquid crystal drive system (LCD driving system) with superpotential driving (over drive) function.Liquid crystal drive system 20 receives a picture signal (video signal) 21, and picture signal 21 may be from display card or other signal source of VCD player (DVD or VCD), computing machine.Picture signal 21 belongs to a kind of grey scale signal, and more common situation is that a sub-pixel (sub-pixel) can have the ability that shows 256 different gray scales.Each different gray scales utilizes integer (for example 0,1,2,3......254,255) with expression when the computing of data processing.Certainly, on carrying out, represent above-mentioned each integer with binary numeral.
Liquid crystal drive system 20 finally can produce control voltage V
CLWith superpotential V
OD, to drive liquid crystal panel (Fig. 1 label 12).Control voltage V
CLProduce according to a drive signal 21 '; And superpotential V
ODProduce according to a superpotential drive signal 23.Liquid crystal drive system 20 comprises a superpotential driver element 22, and it produces drive signal 21 ' according to view data 21; And, and produce superpotential drive signal 23 according to view data 21 and superpotential drive signal tables of data (for example shown in Figure 4).Be built in the voltage drive signals tables of data in the superpotential driver element 22.Drive signal 21 ' and superpotential drive signal 23 are all the grey scale signal of digital pattern.Liquid crystal drive system 20 also comprises a selector switch 24, receives a logic zero signal or a logical one signal from superpotential driver element 22, to select output drive signal 21 ' or superpotential drive signal 23.Afterwards, after 33 pairs of signal Processing of one or more aft-end assembly, produce control voltage V via driving circuit (driver IC) 35
CLWith superpotential V
ODWherein, aft-end assembly 33 comprises for example Frame-rate Control device or other electronic package.
Drive signal 21 ' directly is equal to the gray scale that picture signal 21 is put down in writing substantially in the gray scale of each time pixel representative of each frame.And superpotential drive signal 23 is in the gray scale of each time pixel representative of each frame, but current frame and former frame need be compared with computing after just computing learn.
The principle of operation brief introduction of superpotential drive signal 23 is as follows:
When image shows, each sub-pixel has " dynamically " and " static state " two kinds of different situation-what is called " dynamically " between frame and frame, refer to that a sub-pixel at former frame (previous frame) and current frame (current frame), shows gray scale inequality; " static state " is meant that then a sub-pixel at former frame and current frame, shows identical gray scale.
Therefore, in liquid crystal drive system 20, need belong to dynamic or static to judge each sub-pixel at frame and interframe according to picture signal 21 with superpotential driving function.When static state, because show same gray scale, therefore can not use superpotential to drive function, therefore, liquid crystal drive system 20 utilizes superpotential driver element 22, directly produces drive signal 21 ' according to picture signal 21.And when dynamic, 22 of superpotential driver elements are according to the grey scale change situation of sub-pixel between frame and frame, and the numerical value of decision superpotential drive signal 23.
For example, the numerical value of superpotential drive signal 23, normally in 256 gray scales that picture signal 21 is had, pick out one and be fit to the person, therefore, the numerical value of each gray scale in the superpotential drive signal 23, on behalf of the numerical value of each gray scale of superpotential drive signal 23, the category that can not break away from the numerical value of the gray scale that picture signal 21 had, meaning promptly-equally under the situation of totally 256 gray scales, also be selected from integer 0,1,2,3......254,255.
As for choosing picture signal 21 which gray scale wherein,, then cooperate following character introduction by Fig. 4 with numerical value as superpotential drive signal 23.
Fig. 4 shows the embodiment of a superpotential drive signal tables of data (overdrive signal look up table).In liquid crystal drive system 20, utilize the numerical value of this superpotential drive signal tables of data with decision superpotential drive signal 23.
As Fig. 4, can show altogether that with a sub-pixel situation of 256 different gray scales is an example, the 0th gray scale is represented white, the 255th gray scale is represented black (certainly also can be anti-).When the inquiry row (Initiallevel) of Fig. 4 are represented former frame (previous frame, for example first frame), the gray scale that a sub-pixel is had; When current frame (current frame, for example second frame) is represented on the inquiry hurdle of Fig. 4 (Final level), the gray scale that this sub-pixel had.Wherein second frame is next to after first frame.
For example, in picture signal 21, if when first frame, one sub-pixel is in the 48th gray scale, and when second frame, this sub-pixel is in the 80th gray scale, at this moment, then can in superpotential drive signal tables of data, table look-up and this moment superpotential drive signal 23 should be the 192nd gray scale.
Please refer to following table, following table is in the process by first frame to the, four frames, the situation of the gray scale that the superpotential drive signal 23 and the drive signal 21 ' of liquid crystal drive system 20 represented respectively:
| |
|
Drive signal 21 ' | |
| First frame | The 48th gray scale | ---- | The 48th gray scale |
| Second frame | The 80th gray scale | The 192nd gray scale | ---- |
| The 3rd frame | The 80th gray scale | ---- | The 80th gray scale |
| The 4th frame | The 224th gray scale | The 255th gray scale | ---- |
In the time of can clearly understanding the renewal of each sub-pixel between frame and frame by last table, not necessarily need to carry out the operation that superpotential drives, for example, when second frame update to the, three frames, because of this sub-pixel maintains the 80th gray scale, promptly static, therefore do not need superpotential drive signal 23 and superpotential V
OD, only need to provide the control voltage that meets the 80th gray scale V
CL, make the liquid crystal molecule of this sub-pixel maintain the identical anglec of rotation, produce identical brightness and get final product.
And when first frame update to the second frame and the 3rd frame update to the four frames, then all having carried out the operation that superpotential drives, this is dynamic situation.For example, during first frame update to the second frame, provide a superpotential V to this sub-pixel
OD(meeting the 192nd gray scale), make liquid crystal molecule can in the required time interval, promptly arrive the required anglec of rotation.
Yet known liquid crystal drive system 20 with superpotential driving function is located in the highest gray scale and minimum gray scale (white frame and black frame), but can't have the superpotential driving capability.
This is because the gray scale numerical value that superpotential drive signal 23 is comprised, be equal to the gray scale numerical value that picture signal 21 is had, therefore, when desire shows the highest gray scale (for example the 255th gray scale), then can't provide a higher grey scale signal to be used as the numerical value of superpotential drive signal 23.In like manner, when desire shows minimum gray scale (for example the 0th gray scale), also can't provide a lower grey scale signal, carry out the operation that superpotential drives.
For example, please cooperate Fig. 3 and Fig. 4, under dynamic situation, picture signal 21 requires a sub-pixel to show the 255th gray scale at current frame, then in liquid crystal drive system 20 the highest numerical value of getable superpotential drive signal 23 also be the 255th gray scale, and fail to be higher than the requirement of picture signal 21.Therefore, the ability that makes liquid crystal molecule quicken to rotate to required angle has then been lost in such superpotential driving.
Therefore how son improves the problem that known technology still has, and more becomes to perfectly having the liquid crystal drive system that superpotential drives function to provide one, is the primary target of the present invention.
Summary of the invention
A purpose of the present invention is to improve the shortcoming that known technology still has, to facilitate progressing greatly of industrial technology.
Another object of the present invention is to provide a kind of and have the liquid crystal drive system that superpotential drives function, and all have the superpotential driving capability in the highest gray scale and minimum gray scale.
The invention provides a kind of liquid crystal drive system and a kind of LCD drive method, wherein have the function that superpotential drives.
Liquid crystal drive system provided by the present invention, it receives a picture signal, the numerical value of picture signal is selected from one first group of gray scale numerical value, this first group of gray scale numerical value comprises a plurality of integer gray scales, and this liquid crystal drive system comprises: a superpotential driver element, a gray scale numerical value converting unit and question blank parts.
The superpotential driver element in order to the current frame that contrasts this picture signal and former frame judging the two for dynamic or static, and in order to computing one superpotential drive signal in dynamic use, the numerical value of this superpotential drive signal is selected from this first group of gray scale numerical value.Gray scale numerical value converting unit is electrically connected to this superpotential driver element, in order to receive this picture signal, to be converted to a drive signal, the numerical value of this drive signal is selected from one second group of gray scale numerical value, this second group of gray scale numerical value has at least one radix point gray scale, and has the gray scale number that equates with this first group of gray scale numerical value.
The question blank parts, comprise a gamma (gamma) correction data table, wherein when static, this drive signal is tabled look-up to this gamma correction data table, to produce the grey scale correction values of a drive signal, and when dynamic, this superpotential drive signal is tabled look-up to this gamma correction data table, to produce the grey scale correction values of a superpotential drive signal.Second group of gray scale numerical value the highest gray scale wherein is less than first group of gray scale numerical value the highest gray scale wherein, or/and, second group of gray scale numerical value minimum gray scale wherein is greater than first group of gray scale numerical value minimum gray scale wherein.About the advantages and spirit of the present invention, and more detailed embodiment can be further understood by following embodiment and accompanying drawing.
Description of drawings
By following detailed description in conjunction with the accompanying drawings, can understand the plurality of advantages of foregoing and this invention easily, wherein:
Fig. 1 is the parent map of LCD;
Fig. 2 is the one reaction time-anglec of rotation graph of a relation of liquid crystal molecule;
Fig. 3 shows a known liquid crystal drive system with superpotential driving function;
Fig. 4 shows the embodiment of a superpotential drive signal tables of data;
Fig. 5 shows the liquid crystal drive system synoptic diagram of one embodiment of the invention;
Fig. 6 is the gray scale numerical value table of comparisons in another embodiment of the present invention;
Fig. 7 is the gray scale numerical value table of comparisons in another embodiment of the present invention; And
Fig. 8 is the production method embodiment of the pairing control voltage of radix point gray scale.
The primary clustering symbol description
Liquid crystal drive system 20,40 picture signals 21,41
Drive signal 21 ', 41 ' superpotential driver element 22,42
Aft- end assembly 33,53 driving circuits 35,55
Question blank parts 46 Frame-rate Control unit 48
The gray scale numerical value table of comparisons 511
Embodiment
Please refer to Fig. 5, Fig. 5 is the liquid crystal drive system synoptic diagram of one embodiment of the invention.Liquid crystal drive system 40 provided by the present invention has a superpotential driver element 42, a gray scale numerical value modular converter 51, question blank parts 46 and a Frame-rate Control unit 48, one or more aft-end assembly 53 and one drive circuit (driver IC) 55.
According to picture signal 41, superpotential driver element 42 can calculate a superpotential drive signal 43.Superpotential drive signal 43 is given dynamic situation use and (is used for producing superpotential V
OD).Superpotential drive signal 43 also is a grey scale signal, and the numerical value of the various gray scales that it comprised is selected from first group of gray scale numerical value G1 (among Fig. 5 embodiment be 0,1,2,3......254,255).
The generation of superpotential drive signal 43 can utilize the mode of tabling look-up, and for example, can utilize a superpotential drive signal tables of data and table look-up to draw.Be built in superpotential driver element 42 in the superpotential drive signal tables of data, embodiment can be with reference to shown in Figure 4.Be stored in the gray scale numerical value of the former frame of storer 421, point to the inquiry row (can with reference to figure 4) of superpotential drive signal tables of data.And the gray scale numerical value of this sub-pixel of the current frame of the view data 41 of input, the inquiry hurdle of sensing superpotential drive signal tables of data.By this, can in superpotential drive signal tables of data, check in the numerical value of required superpotential drive signal 43.
Gray scale numerical value modular converter 51 is electrically connected to superpotential driver element 42, in order to receive picture signal 41, to be converted to a drive signal 41 '.Drive signal 41 ' also is a grey scale signal, and the numerical value of the various gray scales that it comprised is selected from one second group of gray scale numerical value G2.Wherein be all the integer gray scale compared to first group of gray scale numerical value, have at least one radix point gray scale (for example 0.5) among second group of gray scale numerical value G2.And second group of gray scale numerical value G2 has the gray scale number that equates with first group of gray scale numerical value G1.For example in Fig. 5 embodiment, the gray scale number of the two is all 256 gray scales.And wherein, wherein the highest gray scale of second group of gray scale numerical value G2 (for example 254) is less than wherein the highest gray scale of first group of gray scale numerical value G1 (for example 255).
At the gray scale numerical value conversion operations that gray scale numerical value modular converter 51 is carried out, can utilize and build a gray scale numerical value table of comparisons (SOD look up table) 511 that places gray scale numerical value modular converter 51, carry out in the mode of tabling look-up.As shown in the figure, the gray scale numerical value table of comparisons 511 is arranged first group of gray scale numerical value G1 and second group of wherein each gray scale numerical value of gray scale numerical value G2 respectively in regular turn, and pairing in regular turn.
By this, for example, when picture signal 41 when a current frame requires a sub-pixel display gray scale numerical value 244, via gray scale numerical value modular converter 51, then numerical value 244 (in fact with binary representation) can be converted to numerical value 243 (in like manner, with binary representation).In the present invention, the picture signal 41 after the conversion is defined as " drive signal 41 ' ".
Drive signal 41 ' is used for producing control voltage V
CL, therefore,, then control voltage V by the gray scale numerical value conversion operations of gray scale numerical value modular converter 51
CLBe limited in this embodiment in the gray scale numerical value 254.
Question blank parts 46 comprise a gamma correction data table 461.Wherein when static, drive signal 41 ' is tabled look-up to gamma correction data table 461, to produce the grey scale correction values of drive signal 41 '.And when dynamic, 43 pairs of Gamma correction tables of data 461 of superpotential drive signal are tabled look-up, to produce the grey scale correction values of superpotential drive signal 43.
Mention among the various embodiment of the invention described above that radix point gray scale (for example among second group of grey scale signal G2 of Fig. 5 embodiment, the gray scale of numerical value 0.5) can be used to make second group of gray scale numerical value G2 to have the gray scale number that equates with first group of gray scale numerical value G1.If do not insert above-mentioned radix point gray scale, then the gray scale number that had of second group of gray scale numerical value G2 can be less than first group of gray scale numerical value G1.Promptly-drive signal 41 ' the available gray scale number is less than picture signal 41, has the shortcoming of loss gray scale (lose gray level) thus.
Therefore, the present invention inserts a newly-increased gray scale between two adjacent integer gray scales, and is defined as " radix point gray scale ".In fact, the numerical value of integer gray scale utilizes binary mode to represent, with the embodiment of totally 256 gray scales, then needs eight to represent 256 gray scales.
About the radix point gray scale, then need at least one extra bits to represent, meaning promptly-the radix point gray scale utilizes this extra bits, to be inserted between two adjacent integer gray scales.Therefore, after the gray scale numerical value conversion operations through gray scale numerical value modular converter 51, eight picture signal 41 is converted at least nine drive signal 41 '.Yet in the practice of general increase position, can once increase by two usually.Therefore, among the embodiment of icon of the present invention, eight picture signal 41 is converted into ten drive signal 41 '.
Effect about radix point gray scale reality then is described below: in fact, the embodiment of Fig. 5 for example, radix point gray scale (numerical value 0.5) is inserted between adjacent two integer gray scales (numerical value 0 and 1), the extra bits in the radix point gray scale can be discerned in Frame-rate Control unit 48, and carries out the control (framerate control) of frame rate, in order in a frame time, switch ground and produce grey value 0 and gray scale numerical value 1, for example shown in Figure 8, thus, then can produce a gray scale of inserting.
Be not difficult in the embodiment that the present invention introduced to find that the radix point gray scale is inserted in low gray scale place, this is because the gamma curve at low gray scale place has better linearity, therefore the radix point gray scale is inserted in low gray scale place and has effect preferably.Via result of experiment repeatedly, be example with totally 256 gray scales, the radix point gray scale is inserted between two adjacent integer gray scales between the 0th gray scale to the 32 gray scales, can make liquid crystal drive system 40 that preferable performance is arranged.
Fundamental purpose of the present invention is to improve known technology at the highest gray scale and minimum gray scale place, does not have the problem of superpotential driving capability.Please continue with reference to figure 5, in this embodiment of the invention, drive signal 41 ' is via the gray scale numerical value conversion operations of gray scale numerical value modular converter 51, so its highest gray scale numerical value becomes 254.Yet the numerical value of crossing moving drive signal 43 is still by selecting among first group of gray scale numerical value G1, and therefore, its highest gray scale numerical value can reach 255.Thus, even be in the highest gray scale place, still can utilize the grey scale signal of numerical value 255 to come as required superpotential driving operation this moment at liquid crystal drive system 40.
Be not difficult to find that embodiment shown in Figure 5 one solves known " the highest gray scale " and do not have an embodiment of problem of superpotential driving force by above-mentioned explanation." minimum gray scale " do not had a problem of superpotential driving force as yet among the embodiment of Fig. 5 and propose solution.
Do not have a problem of superpotential driving force about known " minimum gray scale ", then can be with reference to shown in Figure 6, it is the gray scale numerical value table of comparisons 512 in another embodiment of the present invention.In this embodiment, second group of gray scale numerical value G2 minimum gray scale (numerical value 1) wherein is greater than first group of gray scale numerical value G1 minimum gray scale (numerical value 0) wherein.Thus, " minimum gray scale " do not have the superpotential driving force problem according to this mode improve.Wherein, between gray scale numerical value 1 and numerical value 2, insert a radix point gray scale (1.5), so that second group of gray scale numerical value G2 has the gray scale number (totally 256 gray scales) that equates with first group of gray scale numerical value G1.
Please refer to shown in Figure 7ly, it is the gray scale numerical value table of comparisons 513 in another embodiment of the present invention.In this embodiment, second group of gray scale numerical value G2 minimum gray scale (numerical value 1) wherein is greater than first group of gray scale numerical value G1 minimum gray scale (numerical value 0) wherein; And second group of gray scale numerical value G2 the highest gray scale (254) wherein is less than first group of gray scale numerical value G1 the highest gray scale (255) wherein.The embodiment of Fig. 7 then can make liquid crystal drive system 40 under a dynamic situation, and picture signal 41 all can have the superpotential driving capability when requiring to show the highest gray scales or minimum gray scale.
In Fig. 7 embodiment, between gray scale numerical value 1 and numerical value 2, insert a radix point gray scale (numerical value 1.5), and between gray scale numerical value 2 and numerical value 3, insert a radix point gray scale (numerical value 2.5), so that second group of gray scale numerical value G2 has the gray scale number (totally 256 gray scales) that equates with first group of gray scale numerical value G1.
, can put out LCD drive method provided by the present invention in order and comprise the following steps: introduction of the present invention according to above-mentioned
A) receive a picture signal 41, its numerical value is selected from one first group of gray scale numerical value G1.
B) former frame of contrast images signal 41 and a current frame are to judge that the two is for dynamic or static.
C) when static state:
Changing this picture signal is a drive signal, and the numerical value of this drive signal is selected from one second group of gray scale numerical value, and this second group of gray scale numerical value has at least one radix point gray scale, and has the gray scale number that equates with this first group of gray scale numerical value;
By a selector switch, transmit this drive signal to one question blank parts; And
According to this drive signal to produce the grey scale correction values of a drive signal.
D) when dynamic:
Calculate a superpotential drive signal, the numerical value of this superpotential drive signal is selected from this first group of gray scale numerical value;
By a selector switch, transmit this superpotential drive signal to question blank parts; And according to this superpotential drive signal to produce the grey scale correction values of a superpotential drive signal.
Wherein, second group of gray scale numerical value G2 the highest gray scale wherein is less than first group of gray scale numerical value G1 the highest gray scale wherein, or/and, second group of gray scale numerical value G2 minimum gray scale wherein is greater than first group of gray scale numerical value G1 minimum gray scale wherein.
The thin embodiment of portion of other of LCD drive method of the present invention has been illustrated in the explanation of above-mentioned liquid crystal drive system.
Comprehensive the above, the invention provides a kind of liquid crystal drive system and method that superpotential drives function that have, wherein, provide perfect solution for known technology in the problem that the highest gray scale and minimum gray scale do not have the superpotential driving force.Though the present invention has carried out the operation of gray scale numerical value conversion to picture signal, yet does not therefore limit operation and the loss gray scale.Therefore, the present invention advances existing liquid crystal superpotential to drive (TFT overdrive) technology significantly.
Though the present invention with preferred embodiment openly as above; right its is not only to terminate in the foregoing description in order to limit the present invention's spirit with invention; any those skilled in the art; under the situation that does not break away from the spirit and scope of the present invention; can change and modification, so protection scope of the present invention is as the criterion with the claim institute restricted portion that is proposed.
Claims (20)
1. a liquid crystal drive system receives a picture signal, and its numerical value is selected from one first group of gray scale numerical value, and this first group of gray scale numerical value comprises a plurality of integer gray scales, and this liquid crystal drive system comprises:
One superpotential driver element, in order to the current frame that contrasts this picture signal and former frame judging the two for dynamic or static, and in order to computing one superpotential drive signal in dynamic use, the numerical value of this superpotential drive signal is selected from this first group of gray scale numerical value;
One gray scale numerical value converting unit, be electrically connected to this superpotential driver element, in order to receive this picture signal, to be converted to a drive signal, the numerical value of this drive signal is selected from one second group of gray scale numerical value, this second group of gray scale numerical value has at least one radix point gray scale, and has the gray scale number that equates with this first group of gray scale numerical value; And
One question blank parts, comprise a gamma correction data table, wherein when static, this drive signal is tabled look-up to this gamma correction data table, to produce the grey scale correction values of a drive signal, and when dynamic, this superpotential drive signal is tabled look-up to this gamma correction data table, to produce the grey scale correction values of a superpotential drive signal.
2. liquid crystal drive system as claimed in claim 1, wherein the highest gray scale of this second group of gray scale numerical value is less than the highest gray scale of this first group of gray scale numerical value.
3. liquid crystal drive system as claimed in claim 2, wherein the minimum gray scale of this second group of gray scale numerical value is greater than the minimum gray scale of this first group of gray scale numerical value.
4. liquid crystal drive system as claimed in claim 1, wherein the minimum gray scale of this second group of gray scale numerical value is greater than the minimum gray scale of this first group of gray scale numerical value.
5. liquid crystal drive system as claimed in claim 1 also comprises a selector switch, couples this superpotential driver element, this gray scale numerical value converting unit and this question blank parts.
6. liquid crystal drive system as claimed in claim 5, wherein this selector switch receives the logic zero signal that this superpotential driver element is exported, and makes this drive signal transfer to this question blank parts.
7. liquid crystal drive system as claimed in claim 5, wherein this selector switch receives the logical one signal that this superpotential driver element is exported, and makes this superpotential drive signal transfer to this question blank parts.
8. liquid crystal drive system as claimed in claim 1 also comprises a Frame-rate Control unit, is electrically connected to this question blank parts.
9. liquid crystal drive system as claimed in claim 8, wherein this radix point gray scale makes two adjacent integer gray scales of this radix point gray scale switch ground and produces by this Frame-rate Control unit.
10. liquid crystal drive system as claimed in claim 1, wherein this superpotential driver element comprises a storer, with the data of the former frame of depositing this picture signal.
11. liquid crystal drive system as claimed in claim 1, wherein this superpotential driver element comprises a superpotential drive signal tables of data.
12. liquid crystal drive system as claimed in claim 1, each gray scale numerical value of this second group of gray scale numerical value wherein, each gray scale numerical value compared to this first group of gray scale numerical value, has at least one extra bits, this at least one radix point gray scale is utilized this extra bits, to be inserted between two adjacent integer gray scales.
13. a LCD drive method comprises the following steps:
Receive a picture signal, its numerical value is selected from one first group of gray scale numerical value;
Contrasting the current frame and the former frame of this picture signal, serves as static or dynamic to judge the two;
When static state:
Changing this picture signal is a drive signal, and the numerical value of this drive signal is selected from one second group of gray scale numerical value, and this second group of gray scale numerical value has at least one radix point gray scale, and has the gray scale number that equates with this first group of gray scale numerical value;
By a selector switch, transmit this drive signal to one question blank parts; And
According to this drive signal to produce the grey scale correction values of a drive signal; Or
When dynamic:
Calculate a superpotential drive signal, the numerical value of this superpotential drive signal is selected from this first group of gray scale numerical value;
By a selector switch, transmit this superpotential drive signal to question blank parts; And
According to this superpotential drive signal to produce the grey scale correction values of a superpotential drive signal.
14. LCD drive method as claimed in claim 13, wherein the highest gray scale of this second group of gray scale numerical value is less than the highest gray scale of this first group of gray scale numerical value.
15. liquid crystal drive system as claimed in claim 14, wherein the minimum gray scale of this second group of gray scale numerical value is greater than the minimum gray scale of this first group of gray scale numerical value.
16. LCD drive method as claimed in claim 13, wherein the minimum gray scale of this second group of gray scale numerical value is greater than the minimum gray scale of this first group of gray scale numerical value.
17. LCD drive method as claimed in claim 13 also comprises by a Frame-rate Control unit, switches ground and produces two adjacent integer gray scales of this radix point gray scale, with must this radix point gray scale.
18. LCD drive method as claimed in claim 13, wherein this superpotential drive signal produces via the method for tabling look-up.
19. LCD drive method as claimed in claim 13, wherein the grey scale correction values of this superpotential drive signal is by this superpotential drive signal, tables look-up and gets through a gamma correction data table.
20. LCD drive method as claimed in claim 13, wherein the grey scale correction values of this drive signal is by this drive signal, tables look-up and gets through a gamma correction data table.
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| CN101216623B (en) * | 2007-01-05 | 2010-08-25 | 群康科技(深圳)有限公司 | Crystal display device and driving method thereof |
| CN101226289B (en) * | 2007-01-15 | 2010-05-19 | 钰瀚科技股份有限公司 | Multiple gamma drive method for liquid crystal display panel |
| CN101727848B (en) * | 2008-10-10 | 2012-02-15 | 华映视讯（吴江）有限公司 | Data alignment device and data alignment method of liquid crystal display |
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| US20030210217A1 (en) * | 2002-05-08 | 2003-11-13 | Lee Baek-Woon | Liquid crystal display and method of modifying gray signals for the same |
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| WO2005020204A1 (en) * | 2003-08-22 | 2005-03-03 | Philips Intellectual Property & Standards Gmbh | System for driving inertia-prone picture-reproducing devices |
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| US20050052387A1 (en) * | 2000-10-27 | 2005-03-10 | Mitsubishi Denki Kabushiki Kaisha | Driving circuit and driving method for LCD |
| US20030210217A1 (en) * | 2002-05-08 | 2003-11-13 | Lee Baek-Woon | Liquid crystal display and method of modifying gray signals for the same |
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| CN1744191A (en) | 2006-03-08 |
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