CN101425267B - Image regulation method - Google Patents

Abstract

The present invention relates to an image-adjusting method applicable to a liquid crystal display device. The image-adjusting method comprises the following steps: providing a lookup table preset with overdrive values of different gray-scale switching points; receiving an initial gray-scale value and a target gray-scale value of a pixel; determining an overdrive range in the lookup table for the pixel, and the overdrive range comprises a plurality of overdrive values of the lookup table; using a weight and linear interpolation method to calculate the overdrive value of the pixel according to the overdrive range, reducing the liquid crystal response time when the pixel is output and obtaining an updated frame, wherein, the diagonal interpolation method calculates the overdrive value of the pixel based on the overdrive values and a weight and linear interpolation relational expression related to the overdrive values and using the linear diagonal interpolation method repeatedly.

Description

Image regulating method

Technical field

The invention relates to a kind of image regulating method, and particularly about a kind of method of adjustment of liquid crystal display image.

Background technology

In recent years, and liquid crystal display (Liquid Crystal Display, LCD) device is flourish, (cathode-ray tube CRT) still belongs to slower by contrast yet the liquid crystal reaction velocity of liquid crystal indicator is with general cathode-ray tube (CRT).So when on liquid crystal indicator, fast during playing animation, just being easy to generate the phenomenon of image residue.

In order to improve the liquid crystal reaction that originally slowly changes, part manufacturer just develops liquid crystal and overdrive that (overdrive, OD) method are quickened the liquid crystal reaction time by the voltage adjustment, make liquid crystal reach desirable brightness in an image time.Ideally, known method need be set up the over-driving look-up table (OD table) of 256*256 size, and default tonal range 0 to 255 has corresponding optimum gradation value, over-drive value that Here it is (OD value) in order to any gray scale when switching gray scale.And in fact because of the factor of memory span, over-driving look-up table is the data of default small part only, and remaining information calculates by the interpolation method.

But the method for known calculations OD value, it is unusual that regular meeting makes liquid crystal gray scale intensities occur, also can make the dynamic image image quality phenomenon of fuzzy or bright rays smear occur.

Summary of the invention

The purpose of this invention is to provide a kind of image regulating method, it is applicable on the liquid crystal indicator, can make the variation of the over-drive value (overdrive value) of adjacent gray scale switching point is to present increasing or decreasing progressively, or presents fixed value ground increasing or decreasing.Therefore, can avoid image quality the phenomenon of fuzzy or bright rays smear to occur.

The present invention proposes a kind of image regulating method, and it is applicable to a liquid crystal indicator.Image regulating method comprises: provide a look-up table, wherein the over-drive value of the default different gray scale switching points of look-up table; An initial gray-scale value that receives a pixel is a purpose gray-scale value of pixel therewith; Determine one first gray scale point, one second gray scale point, one the 3rd gray scale point and one the 4th gray scale point according to pixel in look-up table, wherein first gray scale point, second gray scale point, the 3rd gray scale point form a quadrilateral with the 4th gray scale point and center on the gray scale switching point of pixel, and quadrilateral is in order to the codomain scope that determines initial gray-scale value and the codomain scope of purpose gray-scale value; The extension axis of purpose gray-scale value intersects in tetragonal both sides has one first to intersect gray scale point and one second crossing gray scale point; According to first gray scale point, second gray scale point, the 3rd gray scale point and the 4th gray scale point, use linear interpolation method to calculate the over-drive value that first over-drive value and second that intersects gray scale point intersects gray scale point; According to the over-drive value of the first crossing gray scale point and the over-drive value of the second crossing gray scale point, use linear interpolation method to calculate a vertical line over-drive value of pixel; In addition, determine a tetragonal wherein clinodiagonal, the extension axis of purpose gray-scale value intersects in clinodiagonal an oblique line gray scale point; According to clinodiagonal wherein 2 relational expressions, use linear interpolation method to calculate the over-drive value of oblique line gray scale point by first gray scale point, second gray scale point, the 3rd gray scale point or the 4th gray scale point; According to the over-drive value and the vertical line over-drive value of oblique line gray scale point, utilization weight and linear interpolation method calculate preferable over-drive value, can reduce the phenomenon of fuzzy pictures or bright rays smear during in order to output pixel.

The present invention is to present increasing or decreasing progressively because of the variation of the over-drive value that adopts adjacent gray scale switching point.Therefore, the over-drive value that utilization weight and linear interpolation method are come calculating pixel, and the over-drive value of gradual change can meet the optimum value that gray scale is switched.So this technology has following advantage: the phenomenon that picture can the chromatic colour smear; Can make dynamic image quality more smooth, graceful; The calculation circuit of using this technology is easy to realize that hardware cost increases limited; And this technology can be widely used in each size liquid crystal panel.

Description of drawings

For above-mentioned purpose of the present invention, feature and advantage can be become apparent, below in conjunction with accompanying drawing the specific embodiment of the present invention is elaborated, wherein:

Fig. 1 is for analyzing the OD value of first kind of known interpolation method.

Fig. 2 is for analyzing the OD value of second kind of known method.

Fig. 3 is the process flow diagram of image regulating method according to an embodiment of the invention.

Fig. 4 is image regulating method according to another embodiment of the present invention.

Fig. 5 (a) is image regulating method according to another embodiment of the present invention, and utilization weight and linear interpolation method.

Fig. 5 (b) and Fig. 5 (c) are the embodiment of key diagram 5 (a) with weight and linear interpolation method.

Fig. 6 is image regulating method according to another embodiment of the present invention.

The main element symbol description:

A: the first oblique line gray scale point

A1: the first vertical line gray scale point

B: the second oblique line gray scale point

B1: the second vertical line gray scale point

B2: vertical line gray scale point

C: the position (gray scale switching point) of desiring to try to achieve over-drive value

C ': the position of ordering with C

I, P1, P2, P3, PA, Pn, Pw: initial gray-scale value

J, C1, C2, Cn: purpose gray-scale value

M, N1: second gray scale point

N, O1: the 3rd gray scale point

O, Q1: the 4th gray scale point

R, M1: first gray scale point

S301～S307, S501～S511: each step of image regulating method

W, W2: oblique line gray scale point

Embodiment

The present inventor checks several known calculations liquid crystal (overdrive that overdrives, OD) Zhi method, known interpolation method running is found when contiguous gray scale is switched in the back by analysis, and the gray scale numerical value that is calculated can have big difference or not meet actual liquid crystal response situation, so cause picture unusual.At first, below the description of each embodiment, the gray scale switching point of POS INT gray-scale value i and purpose gray-scale value j is expressed as P (i, j), wherein i, j is integer in look-up table.Please refer to Fig. 1, Fig. 1 is for analyzing the OD value of first kind of known interpolation method.The over-driving look-up table (OD table) of first kind of known interpolation method use has been preset the over-drive value (OD value) of P (0,0), P (16,0), P (0,16) and P gray scale switching points such as (16,16), and remaining information calculates corresponding OD value by the interpolation method.Yet the grey value part that this calculates does not also meet the human eye perception, for example for a certain pixel, if the gray scale switching point is P (11,11), represent initial gray-scale value 11 and purpose gray-scale value 11, gray scale does not have variation to belong to static ideally, and interpolation method result of calculation should be 11 gray scales, but result of calculation is 15 gray scales, and causes in the picture liquid crystal of corresponding this pixel can be bright excessively.Therefore, contiguous gray scale is when doing to switch, and the pixel in the picture uses the OD value that does not meet actual liquid crystal response situation, can cause the unusual phenomenon of liquid crystal brightness.

Analyze second kind of known method again and please refer to Fig. 2, Fig. 2 is that second kind of known method calculates the OD value.In certain scope, adopt contiguous gray scale to switch, have the part gray scale can not need, and directly the output gray level value is used as the OD value through the computing of interpolation method.The over-drive value of this known method predetermined fraction gray scale switching point in look-up table, for example default P (0,0), P (16,0), P (0,16), and not need through the computing of interpolation method with interior 8 gray scales to suppose when grey scale change with P over-drive value such as (16,16).Wherein, initial gray-scale value 8 does not carry out the computing of interpolation method and directly output with the gray scale switching point P (8,12) of purpose gray-scale value 12, and the OD value of P (8,12) is 12 gray scales; Initial gray-scale value 7 need carry out the computing of interpolation method with the gray scale switching point P (7,12) of purpose gray-scale value 12, and the OD value of P (7,12) is 20 gray scales.Therefore, can know the OD value of these two contiguous gray scales and incorrect, can not meet desirable liquid crystal response situation and make picture phenomenons such as the smear of bluring or bright rays smear occur.

During in view of the switching of vicinity gray scale do, known technology has fuzzy or bright rays smear phenomenon, and when one of principal character of the present invention was the switching of utilization vicinity gray scale do, its OD value was gradual variation.Below begin to illustrate image regulating method of the present invention.

Please refer to Fig. 3, Fig. 3 is the process flow diagram of image regulating method according to an embodiment of the invention.Each step of image regulating method is as follows.In step S301, provide a look-up table, the corresponding over-drive value of wherein default several different gray scale switching points of look-up table, and each gray scale switching point.In step S303, receive an initial gray-scale value and a purpose gray-scale value of a pixel.In step S305, the overdrive range of decision pixel in look-up table, overdrive range is made of most gradation conversion points, and corresponding these a little gradation conversion points can form a polygon, and polygonal sideline can be desired the gray scale switching point of computing pixel around this.

Next in step S307, because above-mentioned polygonal gray scale switching point can go out each default over-drive value according to the look-up table correspondence, therefore according to this polygonal overdrive range, the over-drive value of using an oblique line gray scale interpolation method to come calculating pixel can reduce the phenomenon of fuzzy pictures or bright rays smear when making output pixel.In this implementation step, oblique line gray scale interpolation method is an oblique line gray-scale relation formula relevant with these over-drive value according to above-mentioned a plurality of over-drive value, uses repeatedly linear interpolation method to calculate the over-drive value of this pixel.Wherein, oblique line gray-scale relation formula can be relevant with a polygonal wherein hypotenuse or a clinodiagonal, and the extension axis of this pixel purpose gray-scale value has an intersection point on hypotenuse or clinodiagonal, and calculate the OD value of this intersection point with the interpolation method.Again according to an analogy or a weight proportion, calculate the OD value (over-drive value) of pixel with the interpolation method, so can be so that can reduce the phenomenon of fuzzy pictures or bright rays smear during output pixel.The setting of above-mentioned weight proportion does not have fixing rule, and setting means can use Gaussian function to distribute and set weighted value, or distributes with random number in the codomain scope of [0,1], or all is made as 1.This technology has knows that usually the knowledgeable should be designed the interpolation method of above-mentioned analogy or weight proportion according to practical application.

Please refer to Fig. 4, Fig. 4 is image regulating method according to another embodiment of the present invention.This image regulating method is a technical foundation with the step of Fig. 3 equally, and the OD value that hypothesis desires to try to achieve pixel at present is C point position.The over-driving look-up table of this embodiment (overdrive lookup table) preset P (P1, C1), P (P2, C1), P (P3, C1), P (P1, C2), P (P2, C2), P (P3, C2) ... or the like the OD value of gray scale switching point, being calculated as follows of detailed image method of adjustment.

Determine a reference point according to the C point in look-up table, represent with the first gray scale point R.Suppose that each gray scale spacing is 16, known C point be P (Pn, Cn), and the position of the unknown first gray scale point R be P (Pr, Cr).Wherein determine the mode of the first gray scale point R, now calculate P (Pr, Cr) as shown in the formula 1 with formula 2:

(1)Pr＝floor(Pn/16)*16；

(2)Cr＝floor(Cn/16)*16，

Wherein, floor () is a mathematical function, obtains integer unconditionally to cast out mode, and numeral 16 is the gray scale spacing of over-driving look-up table.This technology has knows that usually the knowledgeable should understand the numeral of the gray scale spacing of formula 1 and formula 2, can adjust to numeral according to the default gray scale spacing situation of actual look-up table.Do not departing under spirit of the present invention and the scope, protection scope of the present invention should be not limited to embodiment and disclose.

Then, according to the first gray scale point R, the second gray scale point M, the 3rd gray scale point N and the 4th gray scale point O of the contiguous first gray scale point R of decision, wherein the first gray scale point R, the second gray scale point M, the 3rd gray scale point N and the 4th gray scale point O form a parallelogram, parallelogram is in order to the codomain scope of the decision C initial gray-scale value of order and the codomain scope of purpose gray-scale value, and parallelogram centers on the C point.Therefore, if the position P of the first gray scale point R (Pr, Cr)=P (P2, C1), the position of the then unknown second gray scale point M be P (P1, C1), the position of the 3rd gray scale point N be P (P2, C2) with the position of the 4th gray scale point O be P (P3, C2).Wherein, the mode of trying to achieve P1, P2, P3, C1 and C2 as shown in the formula 3 to formula 7:

(3)P1＝floor(Pn/16)*16-16；

(4)P2＝floor(Pn/16)*16；

(5)P3＝floor(Pn/16)*16+16；

(6)C1＝floor(Cn/16)*16；

(7)C2＝floor(Cn/16)*16+16，

Wherein, floor () is a mathematical function, obtains integer unconditionally to cast out mode, and numeral 16 is the gray scale spacing of over-driving look-up table.

Then, crossing with the extension axis of purpose gray-scale value Cn in wherein two parallel edges of parallelogram, and to the first oblique line gray scale point A and the second oblique line gray scale point B should be arranged.Then, position and over-drive value according to the first gray scale point R, the second gray scale point M, the 3rd gray scale point N and the 4th gray scale point O, use linear interpolation method to calculate the over-drive value of the first oblique line gray scale point A and the over-drive value of the second oblique line gray scale point B, as shown in the formula 8 to formula 9:

$\left(8\right)---A=M+\frac{\mathrm{Cn}-C1}{C2-C1}(N-M);$

$\left(9\right)---B=R+\frac{\mathrm{Cn}-C1}{C2-C1}(O-R).$

At last,, use linear interpolation method just can calculate the over-drive value that C is ordered according to position and its over-drive value of the first oblique line gray scale point A and the second oblique line gray scale point B, as shown in the formula 10:

$\left(10\right)---C=A+\frac{\mathrm{Pn}-\mathrm{PA}}{P2-P1}(B-A),$ Wherein $\mathrm{PA}=\mathrm{<figure-callout\; id="1"\; label="P"\; filenames="S2007101669183E00011.png,S2007101669183E00021.png"\; state="\{\{state\}\}">P</figure-callout>}1+\frac{\mathrm{Cn}-C1}{C2-C1}(P2-P1),$

Therefore, obtain the over-drive value of pixel, reduce the phenomenon of fuzzy pictures or bright rays smear in the time of can being used in output pixel by formula 10.And the second gray scale point M, the 3rd gray scale point N of the contiguous first gray scale point R of decision and the setting means of the 4th gray scale point O are not limited to above-mentioned setting example, this technology has knows that usually the knowledgeable should decide positions such as R, M, N, O according to practical application, calculated the over-drive value that C is ordered at R, M, the formed parallelogram of N, O again.Therefore do not departing under spirit of the present invention and the scope, protection scope of the present invention should be not limited to embodiment and disclose.

In addition, in above-mentioned steps, determine the second gray scale point M, the 3rd gray scale point N and the 4th gray scale point O, if wherein not in the scope of over-driving look-up table, for example the initial gray-scale value of above-mentioned gray scale point less than 0 or initial gray-scale value greater than 255 situation, this not the point of the gray scale in the look-up table scope can use a numerical value to be used as over-drive value.

Fig. 5 (a) is image regulating method according to another embodiment of the present invention, and utilization weight and linear interpolation method.Fig. 5 (a) please cooperate Fig. 5 (b) with Fig. 5 (c) reference for convenience of description, and Fig. 5 (b) and the embodiment of Fig. 5 (c) for utilization weight and linear interpolation method.Please refer to Fig. 5 (a),, receive an initial gray-scale value and a purpose gray-scale value of a pixel in step S501.Please refer to Fig. 5 (c), suppose that the OD value of desiring calculating pixel at present is C point position.Over-driving look-up table preset P (P1, C1), P (P2, C1), P (P1, C2), P (P2, C2) ... or the like the OD value of gray scale switching point.

Step S503 in Fig. 5 (a), determine the first gray scale point M1 according to the C point in look-up table, the second gray scale point N1, the 3rd gray scale point O1 and the 4th gray scale point Q1, if known C point is P (Pn, Cn), then the position of the Wei Zhi first gray scale point M1 is P (P1, C1), the position of the second unknown gray scale point N1 is P (P1, C2), the position of the 3rd unknown gray scale point O1 be P (P2, C2), the position of the 4th unknown gray scale point Q1 is P (P2, C1), these 4 can be around C point and form a quadrilateral, and this quadrilateral is in order to the codomain scope that determines the initial gray-scale value that C is ordered and the codomain scope of the purpose gray-scale value that C is ordered.Wherein, the mode of trying to achieve P1, P2, P3, C1 and C2 as shown in the formula 11 to formula 14:

(11)P1＝floor(Pn/16)*16；

(12)P2＝floor(Pn/16)*16+16；

(13)C1＝floor(Cn/16)*16；

(14)C2＝floor(Cn/16)*16+16，

Wherein, floor () is a mathematical function, obtains integer unconditionally to cast out mode, and numeral 16 is the gray scale spacing of over-driving look-up table.This technology has knows that usually the knowledgeable should understand the numeral of formula 11 to the gray scale spacing of formula 14, can adjust to numeral according to the default gray scale spacing situation of actual look-up table.Do not departing under spirit of the present invention and the scope, protection scope of the present invention should be not limited to embodiment and disclose.

Then, in the step S505 of Fig. 5 (a), find out the over-drive value (OD value) of positions such as the first gray scale point M1, the second gray scale point N1, the 3rd gray scale point O1 and the 4th gray scale point Q1.Intersecting in tetragonal wherein both sides with the extension axis of the purpose gray-scale value Cn of C point pixel has the first vertical line gray scale point A1 and the second vertical line gray scale point B1.Then,, use linear interpolation method to calculate the over-drive value of the first vertical line gray scale point A1 and the over-drive value of the second vertical line gray scale point B1 according to the first gray scale point M1, the second gray scale point N1, the 3rd gray scale point O1 and the 4th gray scale point Q1, as shown in the formula 15 with formula 16:

$\left(15\right)---\mathrm{<figure-callout\; id="1"\; label="A"\; filenames="S2007101669183E00011.png,S2007101669183E00021.png"\; state="\{\{state\}\}">A</figure-callout>}1=\mathrm{<figure-callout\; id="1"\; label="M"\; filenames="S2007101669183E00011.png,S2007101669183E00021.png"\; state="\{\{state\}\}">M</figure-callout>}1+\frac{\mathrm{Cn}-C1}{C2-C1}(N1-M1);$

$\left(16\right)---\mathrm{<figure-callout\; id="1"\; label="B"\; filenames="S2007101669183E00011.png,S2007101669183E00021.png"\; state="\{\{state\}\}">B</figure-callout>}1=\mathrm{<figure-callout\; id="1"\; label="Q"\; filenames="S2007101669183E00011.png,S2007101669183E00021.png"\; state="\{\{state\}\}">Q</figure-callout>}1+\frac{\mathrm{Cn}-C1}{C2-C1}(O1-Q1).$

Then,, use linear interpolation method to calculate a vertical line over-drive value of pixel and with C ' some expression according to the over-drive value of the first vertical line gray scale point A1 and the over-drive value of the second vertical line gray scale point B1, and the position (step S507) that C ' point is ordered with C.The over-drive value of C ' point is as shown in the formula 17:

$\left(17\right)---C^{\&prime;}=A1+\frac{\mathrm{Pn}-P1}{P2-P1}(B1-A1).$

Then in step S509, determine a tetragonal wherein clinodiagonal, this diagonal line is by the first gray scale point M1 and the 3rd gray scale point O1, and intersect in clinodiagonal with the extension axis of purpose gray-scale value Cn an oblique line gray scale point W is arranged, the position of oblique line gray scale point W is that (Pw Cn), wherein makes gray-scale value all the same with the gray scale spacing of purpose gray-scale value because of rising of look-up table to P, therefore | Pw-P1|=|Cn-C1| is an equal proportion, so Pw=P1+|Cn-C1|.And, use linear interpolation method to calculate the over-drive value of oblique line gray scale point W according to 2 relations of clinodiagonal by the first gray scale point M1 and the 3rd gray scale point O1, as shown in the formula 18:

$\left(18\right)---W=\mathrm{<figure-callout\; id="1"\; label="M"\; filenames="S2007101669183E00011.png,S2007101669183E00021.png"\; state="\{\{state\}\}">M</figure-callout>}1+\frac{\mathrm{Cn}-C1}{C2-C1}(O1-M1).$

In step S511, according to the over-drive value of oblique line gray scale point W and the vertical line over-drive value of C ' point, utilization weight and linear interpolation method calculate the over-drive value of C point pixel at last.The over-drive value that C is ordered can be calculated and obtain to weight and linear interpolation method therefore as shown in the formula 19 or formula 20.

(19)C＝α*W+β*C′，

Wherein, α and β are in the formula 19 | Pn-Pw | scale-up factor, can use a mathematical expression to try to achieve, or try to achieve in a weight look-up table mode.This | Pn-Pw | variation such as being from 0 to 16,0 to 16 do not exceed certainly with this.And | the ratio of Pn-Pw|: α: β can be as follows,

α and β present an equal difference progression; Perhaps | the ratio of Pn-Pw|: α: β can be as follows,

α and β present a geometric ratio progression.

In addition, when threshold values (threshold) during less than the gray scale spacing, the over-drive value of then trying to achieve C point pixel can be decided by following formula,

$\left(20\right)C=\frac{T-|\mathrm{Pn}-\mathrm{Pw}|}{T}*W+\frac{|\mathrm{Pn}-\mathrm{Pw}|}{T}*C^{\&prime;},$

Wherein, the T of formula 20 is a threshold parameter, and for example the gray scale spacing of look-up table is 16, and T is 16, and the size of threshold parameter T is not as limit.About

The compute mode of formula 20 is carried out with weight and linear interpolation method, and please refer to Fig. 5 (b) and Fig. 5 (c), in this formula 20, can see the α that makes in the formula 19

With β with

With

Replace, determine the first gray scale point M1, the second gray scale point N1, the 3rd gray scale point O1 and the 4th gray scale point Q1 according to the C point in over-driving look-up table, wherein calculate C ' with the formula of being same as 15 to the linear interpolation method of formula 17, and calculate W with the linear interpolation method of the formula of being same as 18, again with the numerical value of C ' and W with

Do the weight computing, can obtain C.

This technology has knows that usually the knowledgeable should understand weight and linear interpolation method has many kind combinations.For example in formula 19, the ratio form of α and β can have many kind combinations, its purpose is when making calculating C point, more the weight near oblique line gray scale point W is big for healing, therefore the weight of ratio can adjust to numeral according to practical situation, and can use a weight look-up table to implement, and the codomain variation pattern of weight look-up table can be to present increasing or decreasing progressively.In addition, determine the setting means of the first gray scale point M1, the second gray scale point N1, the 3rd gray scale point O1 and the 4th gray scale point Q1 to be not limited to above-mentioned setting example according to the C point in over-driving look-up table, this technology has knows that usually the knowledgeable should decide positions such as M1, N1, O1, Q1 according to practical application, calculated the over-drive value that C is ordered at M1, N1, the formed quadrilateral of O1, Q1 again.Therefore do not departing under spirit of the present invention and the scope, protection scope of the present invention should be not limited to embodiment and disclose.

Please refer to Fig. 6, Fig. 6 is image regulating method according to another embodiment of the present invention.This image regulating method is a technical foundation with the step of Fig. 3 equally, and the present OD value of desiring calculating pixel of hypothesis is C point position.The over-driving look-up table of this embodiment preset P (P1, C1), P (P2, C1), P (P1, C2), P (P2, C2) ... or the like the OD value of gray scale switching point, each gray scale spacing is 16, being calculated as follows of detailed image method of adjustment.

Determine a reference point according to the C point in look-up table, represent with the first gray scale point R2, suppose known C point for P (Pn, Cn), and the position of the first unknown gray scale point R2 be P (P1, C1).Wherein determine P (P1, formula that is calculated as follows 21 C1) and formula 22:

(21)P1＝floor(Pn/16)*16；

(22)C1＝floor(Cn/16)*16，

Wherein, floor () is a mathematical function, obtains integer unconditionally to cast out mode, and numeral 16 is the gray scale spacing of over-driving look-up table.This technology has knows that usually the numeral that the knowledgeable should understand formula 21 and the gray scale spacing of formula 22 can adjust to numeral according to the default gray scale spacing situation of actual look-up table.

Then, according to the first gray scale point R2, the second gray scale point M2 and the 3rd gray scale point N2 of the contiguous first gray scale point R2 of decision.Wherein the first gray scale point R2, the second gray scale point M2 and the 3rd gray scale point N2 are in order to the codomain scope that determines initial gray-scale value and the codomain scope of purpose gray-scale value.One oblique line extends through the first gray scale point R2 and the 3rd gray scale point N2, and a vertical line extends through the second gray scale point M2 and the 3rd gray scale point N2, and the position of the second gray scale point M2 be P (P2, C1), the position of the 3rd gray scale point N2 be P (P2, C2).Wherein, the relation of P1, P2, C1 and C2 as shown in the formula 23 to formula 26:

(23)P1＝floor(Pn/16)*16；

(24)P2＝floor(Pn/16)*16+16；

(25)C1＝floor(Cn/16)*16；

(26)C2＝floor(Cn/16)*16+16，

Wherein, floor () is a mathematical function, obtains integer unconditionally to cast out mode, and numeral 16 is the gray scale spacing of over-driving look-up table.

Then, be that the extension axis of Cn intersects in oblique line an oblique line gray scale point W2 is arranged with the purpose gray-scale value of C point pixel, the extension axis of Cn also has a vertical line gray scale point B2 in vertical line is crossing.Then,, use linear interpolation method to calculate the over-drive value of oblique line gray scale point W2 according to the over-drive value of the first gray scale point R2 and the over-drive value of the 3rd gray scale point N2, as shown in the formula 27:

$\left(27\right)---\mathrm{<figure-callout\; id="2"\; label="W"\; filenames="S2007101669183E00011.png,S2007101669183E00021.png"\; state="\{\{state\}\}">W</figure-callout>}2=\mathrm{<figure-callout\; id="2"\; label="R"\; filenames="S2007101669183E00011.png,S2007101669183E00021.png"\; state="\{\{state\}\}">R</figure-callout>}2+\frac{\mathrm{Cn}-C1}{C2-C1}(N2-R2);$

According to the over-drive value of the second gray scale point M2 and the 3rd gray scale point N2 and its position, use linear interpolation method to calculate the over-drive value of vertical line gray scale point B2, as shown in the formula 28:

$\left(28\right)---\mathrm{<figure-callout\; id="2"\; label="B"\; filenames="S2007101669183E00011.png,S2007101669183E00021.png"\; state="\{\{state\}\}">B</figure-callout>}2=\mathrm{<figure-callout\; id="2"\; label="M"\; filenames="S2007101669183E00011.png,S2007101669183E00021.png"\; state="\{\{state\}\}">M</figure-callout>}2+\frac{\mathrm{Cn}-C1}{C2-C1}(N2-M2).$

At last,, use linear interpolation method just can calculate the over-drive value that C is ordered according to the over-drive value of oblique line gray scale point W2 and the over-drive value of vertical line gray scale point B2, as shown in the formula 29:

$\left(29\right)---C=\mathrm{<figure-callout\; id="2"\; label="W"\; filenames="S2007101669183E00011.png,S2007101669183E00021.png"\; state="\{\{state\}\}">W</figure-callout>}2+\frac{\mathrm{Pn}-\mathrm{Pw}}{P2-\mathrm{Pw}}(B2-W2),$ Wherein $\mathrm{Pw}=\mathrm{<figure-callout\; id="1"\; label="P"\; filenames="S2007101669183E00011.png,S2007101669183E00021.png"\; state="\{\{state\}\}">P</figure-callout>}1+\frac{\mathrm{Cn}-C1}{C2-C1}(P2-P1),$

Therefore, the over-drive value of pixel can be obtained, the phenomenon of fuzzy pictures or bright rays smear can be reduced when being used in output pixel by formula 29.Yet, determine a reference point to obtain the first gray scale point R2 according to the C point in look-up table, decide the second gray scale point M2 of the contiguous first gray scale point R2 and the setting means of the 3rd gray scale point N2 to be not limited to above-mentioned setting example according to the first gray scale point R2 again, this technology has knows that usually the knowledgeable should decide positions such as R2, M2, N2 according to practical application, calculated the over-drive value that C is ordered at positions such as R2, M2, N2 again.Therefore do not departing under spirit of the present invention and the scope, protection scope of the present invention should be not limited to embodiment and disclose.

Comprehensively above-mentioned, it is to present increasing or decreasing progressively that the present invention adopts the variation of the over-drive value of adjacent gray scale switching point.Therefore, the over-drive value of using an oblique line gray scale interpolation method to come calculating pixel, and the over-drive value of gradual change can meet the optimum value that gray scale is switched, so this technology has following advantage:

1. the phenomenon that picture can the chromatic colour smear;

2. can make dynamic image quality more smooth, graceful;

3. the calculation circuit of using this technology is easy to realize that hardware cost increases limited;

4. this technology can be widely used in each size liquid crystal panel.

Though the present invention discloses as above with preferred embodiment; right its is not in order to qualification the present invention, any those skilled in the art, without departing from the spirit and scope of the present invention; when can doing a little modification and perfect, so protection scope of the present invention is when with being as the criterion that claims were defined.

Claims (3)

1. an image regulating method is applicable to a liquid crystal indicator, it is characterized in that, this image regulating method comprises:

A. provide a look-up table, wherein the over-drive value of the default different gray scale switching points of this look-up table;

B. receive an initial gray-scale value of a pixel and a purpose gray-scale value of this pixel;

C. determine one first gray scale point, one second gray scale point, one the 3rd gray scale point and one the 4th gray scale point according to this pixel in this look-up table, wherein this first gray scale point, this second gray scale point, the 3rd gray scale point form a quadrilateral with the 4th gray scale point and center on the gray scale switching point of this pixel, and this quadrilateral is in order to the codomain scope that determines this initial gray-scale value and the codomain scope of this purpose gray-scale value;

D1. the extension axis of this purpose gray-scale value intersects in these tetragonal both sides has one first to intersect gray scale point and one second crossing gray scale point;

D2. according to this first gray scale point, this second gray scale point, the 3rd gray scale point and the 4th gray scale point, use linear interpolation method to calculate the over-drive value of this first crossing gray scale point and the over-drive value of this second crossing gray scale point;

D3. according to the over-drive value of this first crossing gray scale point and the over-drive value of this second crossing gray scale point, use linear interpolation method to calculate a vertical line over-drive value of this pixel;

D4. determine this tetragonal wherein clinodiagonal, the extension axis of this purpose gray-scale value intersects in this clinodiagonal an oblique line gray scale point;

D5. according to this clinodiagonal wherein 2 relational expressions, use linear interpolation method to calculate the over-drive value of this oblique line gray scale point by this first gray scale point, this second gray scale point, the 3rd gray scale point or the 4th gray scale point; And

D6. according to over-drive value and this vertical line over-drive value of this oblique line gray scale point, utilization weight and linear interpolation method calculate the over-drive value of this pixel.

2. image regulating method as claimed in claim 1 is characterized in that, if the gray scale difference of this initial gray-scale value and this purpose gray-scale value distance is during less than a threshold values, steps d 6 is also carried out weight calculation according to this threshold values, to calculate the over-drive value of this pixel.

3. image regulating method as claimed in claim 1 is characterized in that, the weight of steps d 6 and linear interpolation method use a weight look-up table to carry out, and the codomain variation pattern of this weight look-up table is to present increasing or decreasing progressively.

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