CN101227549A - Method for setting dithering matrix and corresponding frame rate control method - Google Patents
Method for setting dithering matrix and corresponding frame rate control method Download PDFInfo
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- CN101227549A CN101227549A CNA2008100333803A CN200810033380A CN101227549A CN 101227549 A CN101227549 A CN 101227549A CN A2008100333803 A CNA2008100333803 A CN A2008100333803A CN 200810033380 A CN200810033380 A CN 200810033380A CN 101227549 A CN101227549 A CN 101227549A
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Abstract
The invention discloses a shake matrix arrangement process and the relative frame rate control process, which not simply takes the shake between two adjacent gray scale voltages into the consideration in the process of arranging the shake matrix, but considers the condition that the brightness expression of two adjacent gray scale driving voltages with different polar are approximate, and conducts the shake among four voltages in view of the polar, thereby reducing the texture which is brought by the shake at a maximum limit. The arrangement process of the shake matrix comprises considering the shake results in advance, and reasonably distributing the positions of a first element and a second element in the arrangement process to make the line pattern which is formed by the connection of the first element which is relative to the driving voltage with positive polar and the second element which is relative to the driving voltage with negative polar in a frame be different from the line pattern in the adjacent frame, or to make the line pattern which is formed the connected of the second element which is relative to the driving voltage with the positive polar and the first element which is relative to the driving voltage with the negative polar in a frame be different from the line pattern in an adjacent frame.
Description
Technical field
The present invention relates to a kind of Advanced Color Enhancement technology, particularly relate to a kind of dither matrix method to set up and use the frame rate control method of corresponding dither matrix.
Background technology
Angle from color, no matter be cathode ray tube (CRT, Cathode Ray Tube) display still is LCD (LCD, Liquid Crystal Display) all there is true colour display screen to show such notion, its implication is meant red, and is green, blue (R, G, B) three color channels all have the ability that physically shows 256 grades of GTGs.CRT monitor can realize that true colour display screen shows, LCD display is then exactly so.
Usually, the color physics display capabilities of liquid crystal panel is can show that by liquid crystal panel on each color channel the figure place of GTG is described.What the low and middle-end LCD adopted now is the 6bit panel, can only show on each passage promptly can show 262144 kinds of colors altogether by 64 grades of GTGs that the color number that it can show physically is less than 2% of 8bit panel.In order to dwindle the gap of 6bit panel and 8bit panel, the LCD Advanced Color Enhancement technology is arisen at the historic moment, it has mainly utilized pixels dithers (PD, Pixel Dithering) algorithm, dynamic dither algorithm or frame rate control (FRC, Frame Rate Control) technology, promptly show, improve the GTG number of liquid crystal cells by the gray scale of control picture element on time or space.
Wherein the PD algorithm comes down to exchange gray scale for the space, does not change on time shaft.A frame is divided into a plurality of pixel square battle arrays of being made up of N pixel, each point in the square formation is changed display gray scale, on viewing distance, will obtain the colouring information of 4 grades of gray scales, utilize similar methods 6bit panel just to obtain more color range.In fact be exactly with around point adopt fixing computing, for the still image of monochrome,, see fixing texture pattern easily because each frame uses with a kind of pattern in shake; And dynamic dither algorithm control frame speed on time-domain, the characteristics that it utilizes the brightness sensation of human eye to disappear immediately along with the disappearance of object brightness, the gray scale of bordering compounding frame makes human eye perceives arrive some non-existent gray scales.The disadvantage of this method is when image is monochromatic rest image, may produce and slight flicker.Dynamically shake can reduce to greatest extent because the texture that shake brings.
The FRC technology is a kind of processing method of time domain+spatial domain, and it is divided into the pixel square battle array that N is ordered with a frame, and in the range of DO of a M frame suitable control frame speed and the pixel grey scale between the consecutive frame, thereby obtain more multistage GTG.
The 6bit panel can reach the display color of 16.2M after by Advanced Color Enhancement technology, almost can match in excellence or beauty with the 16.7M of 8bit panel, so quickened the research and development of people to Advanced Color Enhancement technology, various technological means occurred.Being 01803704.6 disclosure of the Invention as: application number is used for a kind of dither method and the device that image shows, application number a kind of method for processing space expansion FRC that has been 200610048989.9 disclosure of the Invention utilizes the shake in spatial domain and time domain+spatial domain to realize the enhancing of color respectively; And application number a kind of display unit that has been 200510008747.2 disclosure of the Invention, it utilizes the difference of data voltage or the striped or the flicker that cause owing to the polarity of data voltage so that it can not produce of the FRC pattern determined on display unit.Preceding two pieces of documents are not all considered the polarity of liquid crystal display screen driving voltage, one piece of situation of not considering the voltage brightness exhibit comparable of the adjacent gray scale opposed polarity that factor causes according to the voltage difference then, and this kind situation is as follows:
Because pixel is electrically driven (operated) by exchanging; so the driving voltage of same gray scale has both positive and negative; but voltage can not be controlled at fully accurate position in the practical application, and often has the situation of the voltage brightness exhibit comparable of the voltage brightness performance difference of same grayscale opposed polarity, adjacent gray scale opposed polarity.In detail as shown in Figure 1, wherein 0 and 1 represent two adjacent gray scales, signal height is represented the size of driving voltage among the figure, be reacted to visually is exactly brightness, promptly+0 ,-0 height represent respectively gray scale be 0 o'clock two kinds of polarity driving voltage size and drive brightness down, it is 1 o'clock size of driving voltage of two kinds of polarity and the brightness under the driving thereof that+1 ,-1 height is represented gray scale respectively.Ideally, promptly driving voltage is controlled at fully accurate position, and as shown in phantom in FIG., the brightness performance of the driving voltage of opposed polarity on same gray scale is identical, and promptly+0 ,-0 height is identical ,+1 ,-1 height is identical; And in actual applications, shown in solid line among the figure, tend to occur-1 and+0 the close situation of height, the situation of the driving voltage brightness exhibit comparable of promptly adjacent gray scale opposed polarity.
In actual applications, this situation tends to cause undesirable horizontal stripe, fixed mode such as vertical bar or oblique line and influence the display effect of liquid crystal panel.For this reason, how to overcome the caused problem of this kind situation, the display effect that improves liquid crystal panel is a major issue in fact.
Summary of the invention
The purpose of this invention is to provide a kind of method to set up of dither matrix and utilize the resulting dither matrix of the method, carry out shake on the time and space, can reduce and shake the texture that is brought in the prior art according to it.
Another object of the present invention provides a kind of frame rate control method and corresponding frame rate control system, during its shake on carrying out the time and space, can reduce and shake the texture that is brought in the prior art.
The invention provides a kind of method to set up of dither matrix for this reason, this dither matrix constitutes shake by a plurality of submatrixs on the time, each submatrix constitutes shake by a plurality of elements on the space, and these a plurality of elements comprise first element with first value and second element with second value, use this dither matrix and can overcome the fixed mode that causes by the driving voltage brightness exhibit comparable of adjacent gray scale opposed polarity, this method comprises: consider the shake result in advance, in setting up procedure, the position of distribution first element and second element appearance rationally, first element that makes corresponding positive polarity driving voltage and corresponding negative polarity driving voltage second element couple together the line patterns that forms in a certain frame different with its line patterns that forms in consecutive frame, and second element that perhaps makes corresponding positive polarity driving voltage and corresponding negative polarity driving voltage first element couple together the line patterns of formation in a certain frame different with its line patterns that forms in consecutive frame.
Further, the difference of above-mentioned line patterns comprises the difference of line patterns position or the difference of shape.
Further, the method to set up of above-mentioned dither matrix also comprises: the number that this dither matrix submatrix is set is 4; The number that the element of above-mentioned each submatrix is set is 4*4.
The present invention also provides a kind of dither matrix, comprise: a plurality of submatrixs, it constitutes temporal shake, wherein each submatrix comprises a plurality of elements and constitutes shake on the space, wherein these a plurality of elements comprise first element with first value and second element with second value, wherein, the line patterns that forms of coupling together in first element of corresponding positive polarity driving voltage and a certain frame of corresponding negative polarity driving voltage second element is different with its line patterns that forms in consecutive frame, and second element of perhaps corresponding positive polarity driving voltage and corresponding negative polarity driving voltage first element couple together the line patterns of formation in a certain frame different with its line patterns that forms in consecutive frame.
Further, the difference that is not all the line patterns position of above-mentioned line patterns or the difference of shape.
Further, above-mentioned dither matrix comprises 4 submatrixs, and each submatrix comprises 4*4 element.
The present invention provides a kind of frame rate control method in addition, be used to handle the high position input data of a low level display apparatus, it is the high-order grey scale pixel value of source images, high-order grey scale pixel value is converted to the time and the spatial distribution of pixel in low level grey scale pixel value and the low level display apparatus, thereby improve the display capabilities of low level display apparatus, comprise:, obtain high-order pixel grey scale mould value high-order grey scale pixel value modulo operation; Respectively at the high-order pixel grey scale mould of difference value, dither matrix is set, wherein this dither matrix constitutes shake by a plurality of submatrixs on the time, each submatrix constitutes shake by a plurality of elements on the space, and these a plurality of elements comprise first element with first value and second element with second value, use this dither matrix and can overcome the fixed mode that causes by the driving voltage brightness exhibit comparable of adjacent gray scale opposed polarity, comprise: consider the shake result in advance, the position of distribution first element and second element appearance rationally, first element that makes corresponding positive polarity driving voltage and corresponding negative polarity driving voltage second element couple together the line patterns that forms in a certain frame different with its line patterns that forms in consecutive frame, and second element that perhaps makes corresponding positive polarity driving voltage and corresponding negative polarity driving voltage first element couple together the line patterns of formation in a certain frame different with its line patterns that forms in consecutive frame; According to high-order pixel grey scale mould value, choose corresponding dither matrix; According to the dither matrix of choosing, calculate the low level grey scale pixel value of a current pixel point.
Further, the difference of above-mentioned line patterns comprises the difference of line patterns position or the difference of shape.
Further, in the above-mentioned process that dither matrix is set, also comprise: the number that this dither matrix submatrix is set is 4; The number that the element of above-mentioned each submatrix is set is 4*4, and the time and the spatial distribution of pixel form three grades of middle gray between adjacent two low level grey scale pixel values in low level display apparatus.
Further, above-mentioned low level grey scale pixel value equals integer part and the gray scale increment amplitude sum of the high-order grey scale pixel value of correspondence divided by 4 gained merchants.
Further, calculate in the low level grey scale pixel value process at the dither matrix that above-mentioned basis is chosen, comprise: determine the value of above-mentioned gray scale increment amplitude, wherein the value of this gray scale increment amplitude is 0 or 1, respectively first element and second element in the corresponding dither matrix.
Further, the process of the value of above-mentioned definite above-mentioned gray scale increment amplitude comprises: in the dither matrix of choosing, choose the submatrix identical with the frame number of current pixel point; Determine the line number of current pixel point in selected submatrix, wherein this line number is by row-coordinate delivery 4 computings in the position coordinate value of current pixel point are obtained; Determine the columns of current pixel point in selected submatrix; In selected submatrix, find the corresponding element of current pixel point according to above-mentioned line number and columns.
Further, the process of the columns of above-mentioned definite current pixel point in selected submatrix comprises: determine current pixel point and its parity of pixel before; The number of the strange pixel before the statistics current pixel point; The number of the dual pixel before the statistics current pixel point; Above-mentioned strange, dual pixel number is carried out delivery 4 computings respectively, obtain a strange pixel mould value and an idol prime modulus value; When above-mentioned modulo operation result was 0, setting above-mentioned columns was 4; When above-mentioned modulo operation result is not 0 and current pixel point when being strange pixel, determine that above-mentioned columns is above-mentioned strange pixel mould value; When above-mentioned modulo operation result is not 0 and current pixel point when being dual pixel, determine that above-mentioned columns is above-mentioned idol prime modulus value.
Further, above-mentioned definite current pixel point and its process of the parity of pixel before comprise: to current pixel point and pairing high-order grey scale pixel value delivery 2 computings of pixel before, wherein, when the result is 0, pixel is a dual pixel, and when the result was 1, pixel was strange pixel.
Another frame rate control system of the present invention, be used to handle the high position input data of a low level display apparatus, it is the high-order grey scale pixel value of source images, high-order grey scale pixel value is converted to the time and the spatial distribution of pixel in low level grey scale pixel value and the low level display apparatus, thereby improve the display capabilities of low level display apparatus, this system comprises: a dither matrix module, its storage is corresponding to a plurality of dither matrixs of the high-order pixel grey scale mould of difference value, wherein this dither matrix comprises: a plurality of submatrixs, it constitutes temporal shake, wherein each submatrix comprises a plurality of elements and constitutes shake on the space, wherein these a plurality of elements comprise first element with first value and second element with second value, wherein, the line patterns that forms of coupling together in first element of corresponding positive polarity driving voltage and a certain frame of corresponding negative polarity driving voltage second element is different with its line patterns that forms in consecutive frame, and second element of perhaps corresponding positive polarity driving voltage and corresponding negative polarity driving voltage first element couple together the line patterns of formation in a certain frame different with its line patterns that forms in consecutive frame; One dither matrix is chosen module, is connected in above-mentioned dither matrix module, puts pairing high-order pixel grey scale mould value according to frame number and this current pixel of a current pixel point, chooses a frame submatrix of a dither matrix in the dither matrix module; One odd even pixel number statistical module determines that current pixel point reaches the parity of pixel before, and number strange before the statistics current pixel point, the idol vegetarian refreshments; One corresponding element determination module, connect above-mentioned dither matrix and choose module and odd even pixel number statistical module, the number of the position coordinate value of selecting according to preceding pixel, the parity of current pixel point and above-mentioned strange, idol vegetarian refreshments, determine current pixel point in selected submatrix corresponding element and determine gray scale increment amplitude according to this corresponding element; One low level grey scale pixel value computing module is connected in above-mentioned corresponding element determination module, according to gray scale increment amplitude, calculates the low level grey scale pixel value of current pixel point.
Further, the difference that is not all the line patterns position of above-mentioned line patterns or the difference of shape.
Further, above-mentioned dither matrix comprises 4 submatrixs, and each submatrix comprises 4*4 element, and the time and the spatial distribution of pixel form three grades of middle gray in this moment low level display apparatus between adjacent two low level grey scale pixel values.
Further, above-mentioned low level grey scale pixel value equals integer part and the gray scale increment amplitude sum of the high-order grey scale pixel value of correspondence divided by 4 gained merchants, and the value of this gray scale increment amplitude is 0 or 1, respectively first element and second element in the corresponding dither matrix.
Further, the line number of above-mentioned corresponding element in submatrix equals mould 4 values of the row-coordinate in the position coordinate value of current pixel point.
Further, when current pixel point is strange pixel, the columns of above-mentioned corresponding element in submatrix equals mould 4 values of the number of above-mentioned strange pixel, when current pixel point is dual pixel, the columns of above-mentioned corresponding element in submatrix equals mould 4 values of the number of above-mentioned idol vegetarian refreshments, when above-mentioned mould 4 values were 0, setting this columns was 4.
In sum, the present invention is not the shake between the simple consideration two adjacent gray-scale voltages in the process that dither matrix is set, but consider the situation of the driving voltage brightness exhibit comparable of adjacent gray levels opposed polarity, and polarity is taken into account, carry out four shakes between the voltage, thereby reduced the texture that shake brings to greatest extent.
Description of drawings
Fig. 1 is the schematic diagram of the driving voltage brightness exhibit comparable situation of adjacent gray levels opposed polarity;
Fig. 2 is the flow chart of FRC processing method according to an embodiment of the invention;
Fig. 3 is a kind of polarity of voltage schematic diagram of inversion driving pattern of two row, one row;
Fig. 4 is 2 o'clock set dither matrix schematic diagrames for high-order pixel grey scale mould value mod_V in one embodiment of the invention;
Fig. 5 by shake in one embodiment of the invention the schematic diagram of formation line patterns;
Fig. 6 is the schematic diagram of 1 o'clock set dither matrix for high-order pixel grey scale mould value mod_V among invention one embodiment;
Fig. 7 is the schematic diagram of 3 o'clock set dither matrixs for high-order pixel grey scale mould value mod_V among invention one embodiment;
Fig. 8 is a kind of FRC system schematic of one embodiment of the invention.
Embodiment
Below in conjunction with accompanying drawing the specific embodiment of the present invention is further described.
Low level display apparatus (for example 6 displays) has high-order input data (for example 8), i.e. the high-order grey scale pixel value of source images, and the grey scale pixel value scope of source images is 0 to 255, the low level grey scale pixel value but has only 0 to 64.One embodiment of the invention provides a frame rate control method for this reason, is converted to the time and the spatial distribution of pixel in low level grey scale pixel value and the low level display apparatus with just high-order grey scale pixel value, thereby improves the display capabilities of low level display apparatus.Below describe the implementation procedure of this frame rate control (FRC) method in detail.
Please refer to Fig. 1, it is the flow chart of FRC processing method according to an embodiment of the invention.This FRC handles and specifically may further comprise the steps:
S101: read in high-order input data, the i.e. high-order grey scale pixel value of source images;
S102: dither matrix is set;
S103: choose corresponding dither matrix;
S104:, calculate the low level grey scale pixel value of current pixel point according to the dither matrix of choosing;
S105: finally shaken the result.
Wherein, after reading in high-order grey scale pixel value, need it is carried out modulo operation.Then, different dither matrixs is set respectively at the high-order pixel grey scale mould of difference value.This sentences common 8 input data and is illustrated as the input data instance of 6 displays, needs to form between adjacent two low level grey scale pixel values three grades of middle gray, mould 4 computings of above-mentioned for this reason modulo operation position this moment.
Below step by step above-mentioned flow process is described in detail:
1. dither matrix is set: background technology is described, in the past when dither matrix is set, do not consider the driving voltage polarity of display or do not consider the situation of the driving voltage brightness exhibit comparable of adjacent gray scale opposed polarity, and in the present embodiment, these factors are considered into.
LCD exists several driving methods, as delegation's one row inversion driving, two row, one row inversion driving, two row, two row inversion driving etc.And drive the polarity distribution that type of relationship driving voltage, and when dither matrix is set, need at first consider the driving type of display unit for this reason, the inversion driving pattern that is listed as with a kind of two row one shown in Figure 2 is an example, and the principle that is provided with of dither matrix is described.
At first ask for high-order pixel grey scale mould value, formula is as follows:
mod_V＝mod(Value，4)；
Wherein, mod_V is high-order pixel grey scale mould value, and Value is high-order grey scale pixel value.
Then, dither matrix is set respectively at the high-order pixel grey scale mould of difference value mod_V.On time domain, dither matrix constitutes shake by a plurality of submatrixs, and on the spatial domain, each submatrix is made up of a plurality of elements, and these a plurality of elements comprise first element with first value and second element with second value, use this dither matrix and can overcome the fixed mode that is caused by the driving voltage brightness exhibit comparable of adjacent gray scale opposed polarity.Present embodiment is gone up in the time and is constituted a circulation by 4 submatrixs, and the submatrix of employing 4*4 carries out the shake on the space.But the present invention is not limited to this, experimental results show that 8 frames are a circulation, adopts the submatrix effect of 8*8 also relatively good.
Referring to Fig. 4, it is the schematic diagram of 2 o'clock set dither matrixs for high-order pixel grey scale mould value mod_V, wherein first element is " 0 ", second element is " 1 ", certainly the present invention is not as limit, also first element is " 1 " in addition, and second element is " 0 ", and its setting up procedure is as follows:
Consider the shake result in advance, the position of distribution first element and second element appearance rationally, first element that makes corresponding positive polarity driving voltage and corresponding negative polarity driving voltage second element couple together the line patterns that forms in a certain frame different with its line patterns that forms in consecutive frame, and second element that perhaps makes corresponding positive polarity driving voltage and corresponding negative polarity driving voltage first element couple together the line patterns of formation in a certain frame different with its line patterns that forms in consecutive frame.
" 1 " and " 0 " is represented respectively and is connected an adjacent gray scale in 64 grades of gray scales for instance, if want to shake the effect of high-order pixel grey scale 202, promptly will show 50.5 in low level display apparatus, needs the shake of 50 and 51 gray scales to produce visual 0.5." 1 " represents 51 gray scales at this moment, and " 0 " represents 50 gray scales.For 0.5 middle gray occurring, " 0 ", " 1 " appear in the submatrix with identical ratio.The gray scale of considering "+0 " and " 1 " may be very approaching, and produce line patterns as shown in Figure 5, and the brightness of these lines is approaching, if four frames all are horizontal stripes, the horizontal stripe pattern finally can occur; If four frames all are slanted bars, finally the slanted bar pattern can appear ... therefore make the lines of every frame all different in 4 frame one-periods, just can avoid this fixed mode generation.As figure, first frame is the odd-numbered line horizontal stripe, and second frame is a slanted bar, the 3rd frame is the even number line horizontal stripe, and the 4th frame is another kind of slanted bar mode, like this through shake, can not produce fixing pattern, because the shake of every bit all is different, flicker visually can not occur again yet.The form of this dither matrix is very effective to the very approaching liquid crystal display screen of the gray scale of this "+0 " and " 1 ", and can guarantee that the mean flow rate of picture is constant substantially.
As Fig. 6,7, it is respectively high-order pixel grey scale mould value mod_V in the foregoing description is 1 and the schematic diagram of 3 o'clock set dither matrixs.It is corresponding first order middle gray and third level middle gray respectively, and the appearance ratio of " 0 ", " 1 " was respectively 3: 1 and 1: 3 at this moment.
Certain above-mentioned dither matrix only is that content of the present invention better is described, is not in order to qualification the present invention, and those skilled in the art can obtain the dither matrix that other have same effect under this prompting.Promptly this dither matrix comprises a plurality of submatrixs, it constitutes temporal shake, wherein each submatrix comprises a plurality of elements and constitutes shake on the space, wherein these a plurality of elements comprise first element with first value and second element with second value, wherein, the line patterns that forms of coupling together in first element of corresponding positive polarity driving voltage and a certain frame of corresponding negative polarity driving voltage second element is different with its line patterns that forms in consecutive frame, and second element of perhaps corresponding positive polarity driving voltage and corresponding negative polarity driving voltage first element couple together the line patterns of formation in a certain frame different with its line patterns that forms in consecutive frame.
2. choose corresponding dither matrix: be provided with correspondingly, promptly the current high-order grey scale pixel value that reads in is carried out modulo operation, the high-order grey scale pixel value mod_V dither matrix identical with the current mould value of calculating of choosing correspondence when being provided with gets final product.Certainly also to consider R, G, B passage etc. in actual applications, known to those skilled in the art, repeat no more.
3. according to the dither matrix of choosing, calculate the low level grey scale pixel value of current pixel point: in this example, the low level grey scale pixel value equals corresponding high-order grey scale pixel value divided by 4 gained merchants' a integer part and the gray scale amplitude sum of rising in value, referring to following formula:
DestPix＝int(SrcPix(x，y)/4)+V(i，j)
Wherein, (x is the pixel value that obtains in R, G, each passage of B in the source images of input y) to SrcPix, and promptly high-order grey scale pixel value is between [0,255]; (x y) is the position coordinate value of current pixel point; Int means the round numbers part, does not round up; (x y) is meant in output image corresponding pixel value to SrcPix, i.e. low level grey scale pixel value is between [0,63]; And V (i is 0 or 1 j), is the gray scale increment amplitude that obtains according to dither matrix.
In the value 0 of gray scale increment amplitude or the corresponding dither matrix of 1 difference " 0 " or " 1 ", so have only according to current pixel point and find its corresponding element in dither matrix, just can determine the value of this gray scale increment amplitude, this moment need be according to the frame number and the position coordinate value of current pixel point, determine its corresponding element in dither matrix, be specially: at first in the dither matrix of choosing, choose the submatrix identical with the frame number of current pixel point; Determine the line number i of current pixel point in selected submatrix then, and line number i equals mould 4 values of the row-coordinate of current pixel point, i.e. i=mod (x, 4); Determine the columns j of current pixel point in selected submatrix again; So, just, can in selected submatrix, find the corresponding element of current pixel point according to line number i and columns j.
In order to obtain better visual effect, after having chosen dither matrix, when determining the corresponding element of current pixel point, adopt certain methods, make the spatial distribution of pixel further obtain to upset, and guarantee the mean flow rate of picture.The present invention in an embodiment just illustration a kind of method of upsetting, it is used for determining the process of columns j, and is specific as follows:
(1) notion of introducing pixel parity, and determine to determine current pixel point and its parity of pixel before, the determination methods of parity is to current pixel point and pairing high-order grey scale pixel value delivery 2 computings of pixel before, wherein, when the result was 0, pixel was a dual pixel, when the result is 1, pixel is strange pixel, and formula is as follows:
mod_Value＝mod(Value，2)；
(2) number of strange, the dual pixel of statistics before the current pixel point, formula is as follows:
num
1＝∑(if?mod_Value＝＝1)
num
2＝∑(if?mod_Value＝＝0)
Wherein, num
1, num
2Be respectively number strange, dual pixel
(3) strange, dual pixel number are carried out delivery 4 computings respectively, and obtain strange pixel mould value and idol prime modulus value; When above-mentioned modulo operation result was 0, setting above-mentioned columns was 4; When above-mentioned modulo operation result is not 0 and current pixel point when being strange pixel, determine that above-mentioned columns is above-mentioned strange pixel mould value; When above-mentioned modulo operation result is not 0 and current pixel point when being dual pixel, determine that above-mentioned columns is above-mentioned idol prime modulus value.Formula is as follows:
pick_num_odd＝mod(num
1，4)
if?pick_num_odd＝＝0
pick_num_odd＝4
end
pick_num_even＝mod(num
2，4)
if?pick_num_even＝＝0
pick_num_even＝4
end
if?mod_value＝＝2
V(i，j)＝F(i，pick_num_even)
else
V(i，j)＝F(i，pick_num_odd)
end
Wherein, (i j) is selected submatrix to F, and current pixel can calculate the row pick_num_odd that needs are got according to the plain number of odd image when being strange pixel in matrix; When if current pixel is strange pixel, can calculate the row pick_num_even that needs are got according to the plain number of icon in matrix, the method recomputates in setting at the beginning of each row, does not add up.
More than describe a kind of FRC processing method in detail by object lesson and formula based on display characteristics, below provide the system that specific embodiment explanation the method is used.
Please referring to Fig. 8, it is a kind of FRC system of one embodiment of the invention, this system is used to handle the high position input data of a low level display apparatus, it is the high-order grey scale pixel value of source images, high-order grey scale pixel value is converted to the time and the spatial distribution of pixel in low level grey scale pixel value and the low level display apparatus, thereby improve the display capabilities of low level display apparatus, handling 8 potential source view data with 6 level display apparatus equally is that example is illustrated.
As shown in Figure 8, this system comprises dither matrix module 20, dither matrix is chosen module 21, odd even pixel number statistical module 22, corresponding element determination module 23, low level grey scale pixel value computing module 24, wherein dither matrix module 20 is stored a plurality of dither matrixs that set as stated above, and exports to dither matrix and choose module 21; And dither matrix is chosen the dither matrix that is input as of module 21, current frame number, and R, G, which passage of B, and high-order pixel grey scale mould value, and choose a submatrix according to input; Odd even pixel number statistical module 22 determines that promptly current pixel point reaches the parity of pixel before, and number strange before the statistics current pixel point, the idol vegetarian refreshments, and the parity of this number and current pixel point exported to corresponding element determination module 23, the parity of its position coordinate value of selecting according to preceding pixel, current pixel point and number strange, the idol vegetarian refreshments, determine current pixel point in selected submatrix corresponding element and determine gray scale increment amplitude according to this corresponding element; Low level grey scale pixel value computing module 24 receives gray scale increment amplitude, calculates the low level grey scale pixel value of current pixel point in view of the above, thereby exports current monochrome information.
, be not that protection scope of the present invention should be as the criterion with the scope that claims are contained in order to qualification the present invention below only for for example.
Claims (20)
1. the method to set up of a dither matrix, this dither matrix constitutes shake by a plurality of submatrixs on the time, each submatrix constitutes shake by a plurality of elements on the space, and these a plurality of elements comprise first element with first value and second element with second value, use this dither matrix and can overcome the fixed mode that causes by the driving voltage brightness exhibit comparable of adjacent gray scale opposed polarity, it is characterized in that this method comprises:
Consider the shake result in advance, the position of distribution first element and second element appearance rationally, first element that makes corresponding positive polarity driving voltage and corresponding negative polarity driving voltage second element couple together the line patterns that forms in a certain frame different with its line patterns that forms in consecutive frame, and second element that perhaps makes corresponding positive polarity driving voltage and corresponding negative polarity driving voltage first element couple together the line patterns of formation in a certain frame different with its line patterns that forms in consecutive frame.
2. the method to set up of dither matrix according to claim 1 is characterized in that, wherein the difference of above-mentioned line patterns comprises the difference of line patterns position or the difference of shape.
3. the method to set up of dither matrix according to claim 1 is characterized in that, also comprises:
The number that this dither matrix submatrix is set is 4;
The number that the element of above-mentioned each submatrix is set is 4*4.
4. a dither matrix is characterized in that, comprising:
A plurality of submatrixs, it constitutes temporal shake, and wherein each submatrix comprises a plurality of elements and constitutes shake on the space, and wherein these a plurality of elements comprise first element with first value and second element with second value,
Wherein, the line patterns that forms of coupling together in first element of corresponding positive polarity driving voltage and a certain frame of corresponding negative polarity driving voltage second element is different with its line patterns that forms in consecutive frame, and second element of perhaps corresponding positive polarity driving voltage and corresponding negative polarity driving voltage first element couple together the line patterns of formation in a certain frame different with its line patterns that forms in consecutive frame.
5. dither matrix according to claim 4 is characterized in that, wherein the difference that is not all the line patterns position of above-mentioned line patterns or the difference of shape.
6. the method to set up of dither matrix according to claim 4 is characterized in that, wherein above-mentioned dither matrix comprises 4 submatrixs, and each submatrix comprises 4*4 element.
7. frame rate control method, be used to handle the high position input data of a low level display apparatus, it is the high-order grey scale pixel value of source images, high-order grey scale pixel value is converted to the time and the spatial distribution of pixel in low level grey scale pixel value and the low level display apparatus, thereby improve the display capabilities of low level display apparatus, it is characterized in that, comprising:
To high-order grey scale pixel value modulo operation, obtain high-order pixel grey scale mould value;
Respectively at the high-order pixel grey scale mould of difference value, dither matrix is set, wherein this dither matrix constitutes shake by a plurality of submatrixs on the time, each submatrix constitutes shake by a plurality of elements on the space, and these a plurality of elements comprise first element with first value and second element with second value, use this dither matrix and can overcome the fixed mode that causes by the driving voltage brightness exhibit comparable of adjacent gray scale opposed polarity, comprising:
Consider the shake result in advance, in setting up procedure, the position of distribution first element and second element appearance rationally, first element that makes corresponding positive polarity driving voltage and corresponding negative polarity driving voltage second element couple together the line patterns that forms in a certain frame different with its line patterns that forms in consecutive frame, and second element that perhaps makes corresponding positive polarity driving voltage and corresponding negative polarity driving voltage first element couple together the line patterns of formation in a certain frame different with its line patterns that forms in consecutive frame;
According to high-order pixel grey scale mould value, choose corresponding dither matrix;
According to the dither matrix of choosing, calculate the low level grey scale pixel value of a current pixel point.
8. frame rate control method according to claim 7 is characterized in that, wherein the difference of above-mentioned line patterns comprises the difference of line patterns position or the difference of shape.
9. frame rate control method according to claim 7 is characterized in that, in the above-mentioned process that dither matrix is set, also comprises:
The number that this dither matrix submatrix is set is 4;
The number that the element of above-mentioned each submatrix is set is 4*4,
And the time and the spatial distribution of pixel form three grades of middle gray between adjacent two low level grey scale pixel values in low level display apparatus.
10. frame rate control method according to claim 9 is characterized in that, wherein above-mentioned low level grey scale pixel value equals integer part and the gray scale increment amplitude sum of the high-order grey scale pixel value of correspondence divided by 4 gained merchants.
11. frame rate control method according to claim 10 is characterized in that, wherein calculates in the low level grey scale pixel value process at the dither matrix that above-mentioned basis is chosen, and comprising:
Determine the value of above-mentioned gray scale increment amplitude, wherein the value of this gray scale increment amplitude is 0 or 1, respectively first element and second element in the corresponding dither matrix.
12. frame rate control method according to claim 11 is characterized in that, the process of the value of above-mentioned definite above-mentioned gray scale increment amplitude comprises:
In the dither matrix of choosing, choose the submatrix identical with the frame number of current pixel point;
Determine the line number of current pixel point in selected submatrix, wherein this line number is by row-coordinate delivery 4 computings in the position coordinate value of current pixel point are obtained;
Determine the columns of current pixel point in selected submatrix;
In selected submatrix, find the corresponding element of current pixel point according to above-mentioned line number and columns.
13. frame rate control method according to claim 12 is characterized in that, the process of the columns of wherein above-mentioned definite current pixel point in selected submatrix comprises:
Determine current pixel point and its parity of pixel before;
The number of the strange pixel before the statistics current pixel point;
The number of the dual pixel before the statistics current pixel point;
Above-mentioned strange, dual pixel number is carried out delivery 4 computings respectively, obtain a strange pixel mould value and an idol prime modulus value;
When above-mentioned modulo operation result was 0, setting above-mentioned columns was 4;
When above-mentioned modulo operation result is not 0 and current pixel point when being strange pixel, determine that above-mentioned columns is above-mentioned strange pixel mould value;
When above-mentioned modulo operation result is not 0 and current pixel point when being dual pixel, determine that above-mentioned columns is above-mentioned idol prime modulus value.
14. frame rate control method according to claim 13 is characterized in that, wherein above-mentioned definite current pixel point and its process of the parity of pixel before comprise:
To current pixel point and pairing high-order grey scale pixel value delivery 2 computings of pixel before, wherein, when the result was 0, pixel was a dual pixel, and when the result was 1, pixel was strange pixel.
15. frame rate control system, be used to handle the high position input data of a low level display apparatus, it is the high-order grey scale pixel value of source images, high-order grey scale pixel value is converted to the time and the spatial distribution of pixel in low level grey scale pixel value and the low level display apparatus, thereby improve the display capabilities of low level display apparatus, it is characterized in that this system comprises:
One dither matrix module, its storage is corresponding to a plurality of dither matrixs of the high-order pixel grey scale mould of difference value, and wherein this dither matrix comprises:
A plurality of submatrixs, it constitutes temporal shake, and wherein each submatrix comprises a plurality of elements and constitutes shake on the space, and wherein these a plurality of elements comprise first element with first value and second element with second value,
Wherein, the line patterns that forms of coupling together in first element of corresponding positive polarity driving voltage and a certain frame of corresponding negative polarity driving voltage second element is different with its line patterns that forms in consecutive frame, and second element of perhaps corresponding positive polarity driving voltage and corresponding negative polarity driving voltage first element couple together the line patterns of formation in a certain frame different with its line patterns that forms in consecutive frame;
One dither matrix is chosen module, is connected in above-mentioned dither matrix module, puts pairing high-order pixel grey scale mould value according to frame number and this current pixel of a current pixel point, chooses a frame submatrix of a dither matrix in the dither matrix module;
One odd even pixel number statistical module determines that current pixel point reaches the parity of pixel before, and number strange before the statistics current pixel point, the idol vegetarian refreshments;
One corresponding element determination module, connect above-mentioned dither matrix and choose module and odd even pixel number statistical module, the number of the position coordinate value of selecting according to preceding pixel, the parity of current pixel point and above-mentioned strange, idol vegetarian refreshments, determine current pixel point in selected submatrix corresponding element and determine gray scale increment amplitude according to this corresponding element;
One low level grey scale pixel value computing module is connected in above-mentioned corresponding element determination module, according to gray scale increment amplitude, calculates the low level grey scale pixel value of current pixel point.
16. frame rate control system according to claim 15 is characterized in that, wherein the difference that is not all the line patterns position of above-mentioned line patterns or the difference of shape.
17. frame rate control system according to claim 15, it is characterized in that, wherein above-mentioned dither matrix comprises 4 submatrixs, and each submatrix comprises 4*4 element, and time and the spatial distribution that hang down pixel in the level display apparatus this moment form three grades of middle gray between adjacent two low level grey scale pixel values.
18. frame rate control system according to claim 17, it is characterized in that, wherein above-mentioned low level grey scale pixel value equals integer part and the gray scale increment amplitude sum of the high-order grey scale pixel value of correspondence divided by 4 gained merchants, and the value of this gray scale increment amplitude is 0 or 1, respectively first element and second element in the corresponding dither matrix.
19., it is characterized in that the line number of wherein above-mentioned corresponding element in submatrix equals mould 4 values of the row-coordinate in the position coordinate value of current pixel point according to the described frame rate control system of claim 17.
20. according to the described frame rate control system of claim 17, it is characterized in that, when wherein current pixel point is strange pixel, the columns of above-mentioned corresponding element in submatrix equals mould 4 values of the number of above-mentioned strange pixel, when current pixel point is dual pixel, the columns of above-mentioned corresponding element in submatrix equals mould 4 values of the number of above-mentioned idol vegetarian refreshments, and when above-mentioned mould 4 values were 0, setting this columns was 4.
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN102760420A (en) * | 2011-04-29 | 2012-10-31 | 晨星软件研发(深圳)有限公司 | Method for dithering display panel and relevant device |
| CN103065600A (en) * | 2013-01-08 | 2013-04-24 | 深圳市华星光电技术有限公司 | Method for selecting frame rate control (FRC) pattern |
| CN101996594B (en) * | 2009-08-14 | 2013-06-05 | 联咏科技股份有限公司 | Liquid crystal display and image dither compensation method |
| CN104240672A (en) * | 2014-09-12 | 2014-12-24 | 京东方科技集团股份有限公司 | Video processing device and method |
| CN111554245A (en) * | 2020-05-22 | 2020-08-18 | Tcl华星光电技术有限公司 | Display device driving method and display device |
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| JP3137367B2 (en) * | 1990-08-09 | 2001-02-19 | 株式会社東芝 | Color panel display control system and computer system |
| JP4390483B2 (en) * | 2003-06-19 | 2009-12-24 | シャープ株式会社 | Liquid crystal halftone display method and liquid crystal display device using the method |
| KR100997978B1 (en) * | 2004-02-25 | 2010-12-02 | 삼성전자주식회사 | Liquid crystal display |
| KR100769194B1 (en) * | 2006-02-06 | 2007-10-23 | 엘지.필립스 엘시디 주식회사 | Flat Display Apparatus, Fabricating Method, Picture Quality Controling Method And Apparatus Thereof |
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| CN101996594B (en) * | 2009-08-14 | 2013-06-05 | 联咏科技股份有限公司 | Liquid crystal display and image dither compensation method |
| CN102760420A (en) * | 2011-04-29 | 2012-10-31 | 晨星软件研发(深圳)有限公司 | Method for dithering display panel and relevant device |
| CN102760420B (en) * | 2011-04-29 | 2015-06-03 | 晨星软件研发(深圳)有限公司 | Method for dithering display panel and relevant device |
| CN103065600A (en) * | 2013-01-08 | 2013-04-24 | 深圳市华星光电技术有限公司 | Method for selecting frame rate control (FRC) pattern |
| CN103065600B (en) * | 2013-01-08 | 2015-10-07 | 深圳市华星光电技术有限公司 | Select the method for FRC pattern |
| CN104240672A (en) * | 2014-09-12 | 2014-12-24 | 京东方科技集团股份有限公司 | Video processing device and method |
| US9697795B2 (en) | 2014-09-12 | 2017-07-04 | Boe Technology Group Co., Ltd. | Video processing device and method |
| CN111554245A (en) * | 2020-05-22 | 2020-08-18 | Tcl华星光电技术有限公司 | Display device driving method and display device |
| CN111554245B (en) * | 2020-05-22 | 2021-10-08 | Tcl华星光电技术有限公司 | Display device driving method and display device |
| WO2023284530A1 (en) * | 2021-07-13 | 2023-01-19 | 深圳市洲明科技股份有限公司 | Gray-scale adaptive extension method, fpga system, device, and medium |
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| CN100568912C (en) | 2009-12-09 |
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