CN1828698B - Flat display and driving method thereof - Google Patents

Abstract

Wherein, the drive method comprises: comparing the difference of pixel gray value of Mth and the (M-1)th frame video data, accounting the opposite pixel number N(M), then computing to output the luminous duty cycle D and amplitude A of the back light source; when N(M) = 0, displaying static picture and setting D to 1 to avoid picture blinking; or else, displaying dynamic picture and setting D less than 1 to drive the back light with impulse light and show clear picture. This invention can obtain supper display performance.

Description

Flat-panel screens and driving method thereof

(1) technical field

The invention relates to a kind of display device and driving method thereof, particularly relevant for a kind of flat-panel screens and driving method thereof.

(2) background technology

Because the arrival of information society, also grow with each passing day as the demand of the display of information media, so industry drops into the development of related display with all strength.Wherein, (Cathode RayTube, CRT) therefore display monopolizes the monitor market all the year round because of having good display quality and technology maturation with cathode-ray tube (CRT) again.Yet, high-tech product tends to frivolous and miniaturization gradually in recent years, therefore have that high image quality, space utilization efficient are good, the flat-panel screens of low consumpting power, advantageous characteristic such as radiationless, example LCD (Liquid Crystal Display, LCD) replace cathode-ray tube display gradually, and become the main flow of present monitor market.

Above-mentioned two kinds of displays all have its strengths and weaknesses, with regard to display quality, cathode-ray tube display is to utilize electron beam and drive luminous with pulsed (impulse type), that is to say in a frame time (about 16.7ms), the pixel intensity amplitude of cathode-ray tube display is to change in time, so can have better display quality when showing dynamic menu.Yet, during with the luminous demonstration tableaux of pulsed, but being easy to generate the problem of film flicker, thereby making the beholder after watching this tableaux for a long time, it is tired uncomfortable that eyes are felt easily.

In LCD, be to come driven for emitting lights at present mostly with freeze mode (hold type).In other words, in each frame time of this LCD, the luminous amplitude of backlight is a definite value.Therefore, the problem of film flicker can't take place in LCD when showing tableaux, can make beholder's eyes when watching tableaux comparatively comfortable.Yet,, can produce the problem of fuzzy pictures (Blurring) because of the characteristic of human eye vision if show dynamic menu with this Backlight For Liquid Crystal Display Panels.

In order to make LCD can have better display quality when showing dynamic menu, prior art is with the pulsed backlight, so that LCD can have identical display quality with cathode-ray tube display when showing dynamic menu.Yet this kind practice but can make LCD have the shortcoming of cathode-ray tube display when showing tableaux simultaneously, thereby loses its advantage originally.

(3) summary of the invention

Purpose of the present invention is exactly in order to address the above problem, and a kind of flat display driving method is provided, and is suitable for making flat-panel screens according to picture character, and selects appropriate drive mode to drive backlight.

A further object of the present invention provides a kind of flat-panel screens, can all have better display quality when showing dynamic and tableaux.

The object of the present invention is achieved like this, and a kind of flat display driving method is suitable for driving the flat-panel screens with I * J pixel.Wherein, this flat-panel screens comprises a backlight, and has stored at least one frame image data in this flat-panel screens.This driving method is when input one a M frame image data during to flat-panel screens, and M frame image data of comparison and be stored in gray scale difference between the pixel of M-1 frame image data in the flat-panel screens exported the pixel image data of M frame again.Add up the number of pixels N (M) that has gray scale difference between M frame image data and M-1 the frame image data afterwards, the luminous work of calculating and exporting backlight then is than (Duty ratio) D and amplitude A, to drive backlight.Wherein, the brightness that backlight is exported is the product of its luminous work than D and amplitude A, and the brightness of backlight is a constant.

Described according to embodiments of the invention, the luminous work of backlight for example is the function D[N (M) of number of pixels N (M) than D], and the amplitude A of backlight for example is the function A[N (M) of number of pixels N (M)].

Described according to embodiments of the invention, the method for statistical pixel number N (M) comprises order

$N\left(M\right)=\underset{i=1}{\overset{I}{\mathrm{\Σ}}}\underset{j=1}{\overset{J}{\mathrm{\Σ}}}\left\{Z\left(M\right)(i,j)\right\}$

Wherein, when M frame image data (i, j) of individual pixel and M-1 frame image data (i, when j) gray scale difference of individual pixel is greater than critical gray scale difference, Z (M) (i, j)=1.Otherwise, when M frame image data (i, j) of individual pixel and M-1 frame image data (i, when j) gray scale difference of individual pixel is less than critical gray scale difference, Z (M) (i, j)=0.Embodiments of the invention for example are to stipulate critical gray scale difference according to the size of noise, for instance, if noise is bigger, then can stipulate higher critical gray scale difference, to avoid noise result of calculation of the present invention are caused influence improperly.Drive among the embodiment of 8 bits (bits) image data one, critical gray scale difference for example is 8, and among the embodiment of driving 6 bits (bits) image data, critical gray scale difference for example is 2.

Described according to embodiments of the invention, the luminous work ratio of backlight is

$D\left[N\left(M\right)\right]=[1-\frac{N\left(M\right)}{N_{\max }}(1-D_{\mathrm{limit}})]$

Wherein, D _LimitFor the critical work of described backlight than (critical duty), N _MaxThen be the contiguous pixels number, wherein work as number of pixels N (M) greater than contiguous pixels number N _MaxThe time, even number of pixels N (M) equals described contiguous pixels number N _MaxIn one embodiment, D is compared in critical work _LimitMinimum value be 25%, and contiguous pixels number N _MaxMaximal value be 0.1 * I * J.

Described according to embodiments of the invention, above-mentioned flat-panel screens more stores the array S of a 1xR, and array S has element S [1], S[2], S[3] ..., S[R], and the initial value of these elements for example is zero.In other words, S[1]=S[2]=...=S[R]=0.At statistical pixel number N (M) afterwards, more comprise number of pixels N (M) is stored among the described array S, so that array S=[N (M), N (M-1), N (M-2) ..., N (M-(R-1))].In other words, it for example is the element S [1] that N (M) is stored in array S, and N (M-1) is stored in S[2] ..., N (M-(R-1)) is stored in S[R].

Described according to embodiments of the invention, before the luminous work of calculating and exporting backlight is than D and amplitude A, more comprise according to S[1] to S[R] and calculate a mean pixel number, and preferably calculate a weighted mean number of pixels N ' (M).In one example, weighted mean number of pixels N ' for example is order (M)

$N^{\′}\left(M\right)=\frac{{\mathrm{\Σ}}_{r=1}^R{a}_r\×S\left[r\right]}{{\mathrm{\Σ}}_{r=1}^R{a}_r}$

Wherein, S[r] be the element of array S, r is 1,2 ..., R, and a _rBe S[r] weighted index, and in one embodiment, weighted index a _r〉=a _R+1〉=0.In addition, the luminous work of backlight than D for example be weighted mean number of pixels N ' function D[N ' (M) (M)], and the amplitude A of backlight for example be weighted mean number of pixels N ' function A[N ' (M) (M)].

Described according to embodiments of the invention, the luminous work ratio of backlight in this way

$D\left[N^{\′}\left(M\right)\right]=[1-\frac{N^{\′}\left(M\right)}{N_{\max }}(1-D_{\mathrm{limit}})]$

In following formula, D _LimitFor the critical work of described backlight than (critical duty), N _MaxIt then is the contiguous pixels number.In one embodiment, D is compared in critical work _LimitMinimum value be 25%, and contiguous pixels number N _MaxMaximal value be 0.1 * I * J.

The present invention also proposes a kind of flat-panel screens, mainly is to be made of display panel, backlight and data control circuit.Wherein, backlight is to be disposed at the display panel below, and data control circuit then is to be connected to display panel and backlight, and data control circuit is made of comparing unit, frame image data storage unit and lamp source control module.

From the above, comparing unit is in order to acceptance and compares a M frame image data and M-1 frame image data that frame image data storage unit then is to be connected to comparing unit, exports comparing unit in order to M the frame image data that will be stored in wherein.In addition, lamp source control module then is to be connected to backlight, in order to the driving of control backlight.

Described according to embodiments of the invention, above-mentioned data control circuit more comprises frame image weight filter (frame image weight filter), it is to be connected to comparing unit, in order to receiving the comparative result that comparing unit is exported, and calculates the weight distribution of comparative result.In one embodiment, frame image weight filter more comprises an array, and this array is in order to the received comparative result of storage frame image weight filter.

Described according to embodiments of the invention, lamp source control module is made of than controller (duty controller) and backlight amplitude controller (amplitude controller) backlight work, and the luminous work ratio of backlight is to be controlled than controller by backlight work, and the luminous amplitude of backlight then is to be controlled by the backlight amplitude controller.

Described according to embodiments of the invention, this flat-panel screens is a LCD.

Effect of the present invention:

Flat-panel screens of the present invention and driving method thereof can make flat-panel screens have the advantage of pulsed backlight and freeze mode backlight simultaneously, and the shortcoming of the pulsed of forgoing backlight and freeze mode backlight, and then make no matter flat-panel screens is to show dynamic menu or tableaux, all can have better display quality.

For further specifying above-mentioned purpose of the present invention, design feature and effect, below with reference to accompanying drawing the present invention is described in detail.

(4) description of drawings

Fig. 1 illustrates the flow chart of steps into driving method in the first embodiment of the present invention.

Fig. 2 A illustrate into the LCD of one embodiment of the invention when showing tableaux, the driving voltage curve synoptic diagram of backlight.

Fig. 2 B illustrate into the LCD of one embodiment of the invention when showing dynamic menu, the driving voltage curve synoptic diagram of backlight.

Fig. 3 illustrates the flow chart of steps into the driving method of the second embodiment of the present invention.

Fig. 4 illustrates the circuit box synoptic diagram into a kind of LCD of one embodiment of the invention.

The symbol description of critical piece and step in the accompanying drawing:

S100: import M frame image data to LCD

S102: the gray scale difference between the pixel of M frame image data of comparison and M-1 frame image data

S104: the pixel of exporting M frame image data

S106: add up the number of pixels N (M) that has gray scale difference between M frame image data and M-1 the frame image data

S108: the luminous work of calculating and exporting Backlight For Liquid Crystal Display Panels is than D[N (M)] and amplitude A [N (M)]

S300: number of pixels N (M) is stored among the array S, so that array S=[N (M), N (M-1), N (M-2) ..., N (M-(R-1))]

S302: calculate weighted mean number of pixels N ' (M)

S304: the luminous work of calculating and output Backlight For Liquid Crystal Display Panels is than D[N ' (M)] and amplitude A [N ' (M)]

400: LCD

410: display panel

420: backlight

430: data control circuit

432: comparing unit

434: frame image data storage unit

436: frame image weight filter

438: lamp source control module

438a: controller is compared in backlight work

438b: backlight amplitude controller

(5) embodiment

Below, the embodiment to flat-panel screens of the present invention and driving method thereof is elaborated with reference to the accompanying drawings.The present invention judges that earlier it is static state or dynamic menu that LCD is desired picture displayed, selects comparatively according to judged result that appropriate drive mode drives backlight again, to improve the display quality of LCD.Below will the present invention be described for embodiment.

The driving method of present embodiment is to be suitable for driving the flat-panel screens with I * J pixel, example: LCD.Wherein, this LCD is to comprise a backlight, and for example is to have stored at least one frame image data in this LCD, and Fig. 1 illustrates in the first embodiment of the present invention, the flow chart of steps of this driving method.

Please refer to shown in Figure 1.

At first carry out step S100, to import a M frame image data to LCD.

Then carry out step S102, with this frame image data relatively and be stored in gray scale difference between the pixel of M-1 frame image data in the LCD.

Then, as described in step S104, export the pixel image data of M frame image data, so that this frame image of this liquid crystal display displays.

Afterwards, as having the number of pixels N (M) of gray scale difference between M frame image data of statistics as described in the step S106 and M-1 the frame image data.Specifically, influence among the step S106 for fear of interference and to produce the statistics that is not inconsistent with actual state because of noise, present embodiment system defines a critical gray scale difference, and present embodiment is so that to drive 8 bits (bits) image data be example the minimum value of critical gray scale difference to be decided to be 8, but it is not in order to limit critical gray scale difference of the present invention, the technical staff author Ke Yi actual state of this area decides critical gray scale extent, and the computing formula of number of pixels N (M) for example is

$N\left(M\right)=\underset{i=1}{\overset{I}{\mathrm{\Σ}}}\underset{j=1}{\overset{J}{\mathrm{\Σ}}}\left\{Z\left(M\right)(i,j)\right\}......\left(1\right)$

Wherein, when M frame image data (i, j) of individual pixel and M-1 frame image data (i, when j) gray scale difference of individual pixel is greater than above-mentioned critical gray scale difference, Z (M) (i, j)=1.Otherwise, when M frame image data (i, j) of individual pixel and M-1 frame image data (i, when j) gray scale difference of individual pixel is less than above-mentioned critical gray scale difference, Z (M) (i, j)=0.

Counting number of pixels N (M) afterwards, then as described in the step S108, calculate and the luminous work of output Backlight For Liquid Crystal Display Panels than D and amplitude A, to drive backlight.In the present embodiment, the luminous work of backlight for example is the function D[N (M) of number of pixels N (M) than D], and the luminous amplitude A of backlight for example is the function A[N (M) of number of pixels N (M)].Wherein, the luminous work of backlight is than D[N (M)] computing formula for example be

$D\left[N\left(M\right)\right]=[1-\frac{N\left(M\right)}{N_{\max }}(1-D_{\mathrm{limit}})]......\left(2\right)$

Wherein

D _Limit: the luminescence threshold work ratio of backlight

N _Max: the contiguous pixels number

It should be noted that, because the light luminance Y that backlight of the present invention sent is a certain value, and light luminance Y is that the luminous work of backlight is than D[N (M)] with the product of the luminous amplitude A [N (M)] of backlight, therefore if the work of backlight than too little, then needs bigger amplitude A [N (M)] to keep certain light luminance.Considering to have the animation of approximate CRT monitor quality when watching dynamic menu, therefore stipulate the critical work of rational backlight and compare D _Limit, make amplitude A approximate infinitely great so that D1imit is unlikely near zero.In the present embodiment, D _LimitMinimum value for example be 25%.

Do not consider when being the difference N=IxJ of whole image data and last picture data just to be called dynamic menu, but in the picture its a part of ratio data not simultaneously, human eye thinks that promptly this is an animation, therefore orders rational gray scale difference heteromerism Nmax, wherein a N _MaxMaximal value for example be 0.1 * I * J, just 10% of the resolution of display.And, when number of pixels N greater than contiguous pixels number N _MaxThe time, present embodiment for example is to make number of pixels N equal contiguous pixels number N _Max

By formula (1) and formula (2) as can be known, when the liquid crystal display displays tableaux, M the frame image data that step S100 imported and being stored between M-1 the frame image data in the LCD, the gray scale difference that may have only are gray scale difference that noise caused.Therefore, the number of pixels N (M) that formula (1) is tried to achieve can equal zero, and the luminous work of the backlight that formula (2) is tried to achieve is than D[N (M)] then be 1, shown in Fig. 2 A.In other words, when the liquid crystal display displays tableaux, the present invention then drives backlight with freeze mode, so that picture does not glimmer, human eye is watched more comfortable.

On the other hand, when the liquid crystal display displays dynamic menu, then can obtain M the frame image data that step S100 imported and be stored in the number of pixels that has gray scale difference between M-1 the frame image data in the LCD, utilize formula (2) to obtain the luminous work of backlight again] than D[N (M) by formula (1).At this moment, D[N (M)] be less than 1, shown in Fig. 2 B.Hence one can see that, and when the liquid crystal display displays dynamic menu, the present invention is with the pulsed drive backlight, so that dynamic menu is comparatively clear.

It should be noted that the light luminance Y that backlight sends equals the luminous work of backlight than the luminous amplitude that multiply by backlight, and light luminance Y is a constant.That is to say, in Fig. 2 B, the luminous work of backlight than and the product of luminous amplitude, be equal Fig. 2 A backlight luminous work than with the product of luminous amplitude, therefore

Y＝D[N(M)]xA[N(M)]＝D[N(K)]xA[N(K)]

Wherein M and K are positive integer, and M is not equal to K.

For instance, the luminous work that Fig. 2 A is illustrated is than D[N (M)] be 1, luminous amplitude A [N (M)] equals A, therefore when the luminous work of Fig. 2 B than D[N (K)] when being 50%, its luminous amplitude A [N (K)] then equals 2A.At this, the brightness Y that the technical staff author of this area can decide backlight to export according to actual state voluntarily, the present invention is not limited it.

Though in the above-described embodiments, M frame image data being imported of comparison step S100 and be stored in M-1 frame image data in the LCD only, it is not in order to qualification the present invention.Below will driving method of the present invention be described for another embodiment.

Fig. 3 illustrates the flow chart of steps into the driving method of the second embodiment of the present invention.In the present embodiment, LCD for example is the array S that stores a 1 * R, that is to say, array S has element S [1], S[2], S[3] ..., S[R].Wherein, these element initial values for example are zero.In other words, when not driving LCD as yet, S[1]=S[2]=...=S[R]=0.

Please refer to shown in Figure 3.

Carrying out step S100 to step S106 according to the described method of first embodiment, then promptly is to carry out step S300, is stored among the array S with the number of pixels N (M) that will finish statistics, and then make S=[N (M), N (M-1), N (M-2), ..., N (M-(R-1))].In other words, N (M) is stored in the element S [1], and N (M-1) is stored in the element S [2] ..., N (M-(R-1)) is stored in the element S [R].

Afterwards, carry out step S302, calculate a mean pixel number to be stored in the number of pixels among the array S according to these.In an embodiment of the present invention, the method for calculating the mean pixel number for example is that these number of pixels are done weighted average calculation, and in the hope of a weighted mean number of pixels N ' (M), its computing formula for example is

$N^{\′}\left(M\right)=\frac{{\mathrm{\Σ}}_{r=1}^R{a}_r\×S\left[r\right]}{{\mathrm{\Σ}}_{r=1}^R{a}_r}......\left(3\right)$

In formula (3), a _rFor there being the weighted index of the number of pixels in the element S [r].And, weighted index a _rFor example be more than or equal to a _R+1In other words, with M the frame close person of healing, its shared flexible strategy are bigger on sequential.What deserves to be mentioned is that the present invention does not limit weighted index a _rValue, have the knack of this skill person and decide in its sole discretion according to actual state.

Calculating weighted mean number of pixels N ' (M) afterwards, then carrying out step S304, the luminous work of just calculating and exporting Backlight For Liquid Crystal Display Panels is than D and amplitude A, to drive backlight.Wherein, the work of backlight than D for example be weighted mean number of pixels N ' function D[N ' (M) (M)], and its computing formula for example is

$D\left[N^{\′}\left(M\right)\right]=[1-\frac{N^{\′}\left(M\right)}{N_{\max }}(1-D_{\mathrm{limit}})]......\left(4\right)$

And amplitude A also be weighted mean number of pixels N ' function A[N ' (M) (M)], and it for example is to equal light luminance Y that backlight sends divided by the work of backlight than D[N ' (M)].

By formula (4) as can be known, in the present embodiment, the luminous work of backlight is than D[N ' (M)] computing formula for example be similar to the formula (2) of preceding embodiment, the number of pixels N ' that its different part only is present embodiment (M) by a plurality of number of pixels after weighted mean and get.

Similarly, by formula (3) and formula (4) as can be known, present embodiment also can be according to dynamic menu or tableaux and is selected suitable backlight driver mode, to reach the effect identical with preceding embodiment.

For carrying out the described driving method of above-mentioned two embodiment, below flat-panel screens of the present invention is described, but it is not in order to limit the present invention especially exemplified by embodiment.

Fig. 4 illustrates the circuit box synoptic diagram into a kind of flat-panel screens of one embodiment of the invention.Please refer to Fig. 4, flat-panel screens for example is a LCD 400, and it is made of display panel 410, backlight 420 and data control circuit 430.Wherein, backlight 420 is to be disposed at display panel 410 belows, in order to provide display panel 410 backlights.430 of data control circuits are to be connected to display panel 410 and backlight 420, and specifically, data control circuit 430 is made of comparing unit 432, frame image data storage unit 434 and lamp source control module 438.

From the above, comparing unit 432 is in order to receive M the frame image data frame (m) that M-1 frame image data frame (m-1) and previous embodiment are imported in step S100, and the pixel grey scale that compares between M frame image data frame (m) and M-1 the frame image data frame (m-1) is poor, exports M frame image frame (m) afterwards again to display panel 410.Wherein, M-1 frame image data frame (m-1) is stored in the frame image data storage unit 434 that is connected to comparing unit 432.And M frame image data frame (m) also can import simultaneously and be stored in the frame image data storage unit 434 when inputing to comparing unit 432, so that compare with the next frame image data in the time at next frame.

It should be noted that, for the pixel of frame image data before a plurality of is listed in reference to (as the described account form of second embodiment), data control circuit of the present invention can also comprise frame image weight filter 436, it is to be coupled to comparing unit 432, in order to receive a plurality of comparative results that comparing unit 432 exported (for example be among second embodiment number of pixels N (M), N (M-1) ..., N (M-(R-1)) etc.).And frame image weight filter 436 more includes the array S of a 1xR, and array S system is by element S [1], S[2], S[3] ..., S[R] institute constitutes, and the initial value of these elements for example is zero.In other words, under original state, S[1]=S[2]=...=S[R]=0.Wherein, R desires the frame number of reference for the user.Frame image weight filter 436 promptly is to be stored among the array S from comparing unit 432 received number of pixels, so that array S=[N (M), N (M-1), N (M-2) ..., N (M-(R-1))].In other words, it for example is the element S [1] that N (M) is stored in array S, and N (M-1) is stored in element S [2] ..., N (M-(R-1)) is stored in element S [R].And calculate the weight distribution of comparative result, export result of calculation (for example be among second embodiment weighted mean number of pixels N ' (M)) to lamp source control module 438 again.Wherein, lamp source control module 438 is made of than controller 438a and backlight amplitude controller 438b backlight work.

From the above, after lamp source control module 438 receives the result of calculation that frame image weight filter 436 exported, lamp source control module 438 is promptly exported suitable driving voltage to backlight 420 according to this result of calculation, with driving backlight 420, and then make LCD 400 display frame according to the frame image data that inputs to display panel 410.Wherein, the luminous work of backlight when amplitude promptly is to control than controller 438a and backlight amplitude controller 438b by backlight work respectively, so that the luminous work of backlight all equates in each frame time than with the product of amplitude, and then make the brightness of backlight can keep the same.

The present invention imports a frame image data to LCD, add up the number of pixels that has gray scale difference between this frame image data and the former frame image data, so that produce N (M), to judge that the shown picture of LCD is dynamic menu or tableaux, decide the luminous work ratio of backlight afterwards again according to statistics.For instance, when statistical result showed has the number of pixels of gray scale difference when non-vanishing, the shown picture of expression LCD is a dynamic menu, and promptly drive backlight (shown in Fig. 2 B) with pulsed voltage this moment, so that this dynamic menu is comparatively clear.

Otherwise, when the number of pixels that has a gray scale difference when statistical result showed is zero, the shown picture of expression LCD is a tableaux, and promptly drive backlight (shown in Fig. 2 A) with freeze mode voltage this moment, produces the problem of film flicker to avoid this tableaux.

In sum, the present invention comes the strobe pulse formula to drive or the freeze mode driving according to the character of display frame in flat-panel screens.In other words, the present invention can make flat-panel screens have the advantage of pulsed drive and freeze mode driving simultaneously, and the shortcoming that the pulsed drive of forgoing and freeze mode drive, and then make no matter flat-panel screens is to show dynamic menu or tableaux, all can have better display quality.

Those of ordinary skill in the art will be appreciated that, above embodiment is used for illustrating the present invention, and be not to be used as limitation of the invention, as long as in connotation scope of the present invention, all will drop in the scope of claims of the present invention variation, the modification of the above embodiment.

Claims (19)

1. flat display driving method, be suitable for driving a flat-panel screens with I * J pixel, wherein said flat-panel screens comprises a backlight, and has stored at least one frame image data in the described flat-panel screens, it is characterized in that described driving method comprises:

Import a M frame image data;

Gray-scale value between the pixel of the pixel of more described M frame image data and a M-1 frame image data, thus gray scale difference obtained;

Export the pixel image data of described M frame image data;

Add up the number of pixels N (M) that has gray scale difference between described M frame image data and described M-1 the frame image data; And

The luminous work of calculating and exporting described backlight according to this number of pixels N (M) is than D and amplitude A, and to drive described backlight, the light luminance that wherein said backlight sent is a constant.

2. flat display driving method as claimed in claim 1 is characterized in that the method for described number of pixels N (M) comprises order

(i when described M frame image data, j) (the i of individual pixel and described M-1 frame image data, when j) gray scale difference of individual pixel is greater than a critical gray scale difference, (i j)=1, and works as (the i of described M frame image data to Z (M), j) (the i of individual pixel and described M-1 frame image data, when j) gray scale difference of individual pixel is less than this critical gray scale difference, and Z (M) (i, j)=0.

3. flat display driving method as claimed in claim 2, the minimum value that it is characterized in that described critical gray scale difference is 2.

4. flat display driving method as claimed in claim 1, the luminous work that it is characterized in that described backlight is the function D[N (M) of described number of pixels N (M) than D], and the luminous amplitude A of described backlight is the function A[N (M) of described number of pixels N (M)].

5. flat display driving method as claimed in claim 4 is characterized in that the luminous work ratio of described backlight

And D _LimitBe a critical work ratio of described backlight, N _MaxIt then is a contiguous pixels number.

6. flat display driving method as claimed in claim 5 is characterized in that described number of pixels N (M) is greater than described contiguous pixels number N _MaxThe time, make this number of pixels N (M) equal this contiguous pixels number N _Max

7. flat display driving method as claimed in claim 5 is characterized in that described critical work compares D _LimitMinimum value be 25%.

8. flat display driving method as claimed in claim 5 is characterized in that described contiguous pixels number N _MaxMaximal value be 0.1 * I * J.

9. flat display driving method as claimed in claim 1, it is characterized in that described flat-panel screens more stores the array S of one 1 * R, and at the described number of pixels N of statistics (M) afterwards, more comprise described number of pixels N (M) is stored among the described array S, so that described array S=[N (M), N (M-1), N (M-2), ..., N (M-(R-1))], wherein R desires the frame number of reference for the user.

10. flat display driving method as claimed in claim 9, the luminous work that it is characterized in that described calculating and export described backlight are than before D and the amplitude A, and the element S [1] that more comprises the described array S of foundation is to S[R] calculating one mean pixel number.

11. flat display driving method as claimed in claim 10 is characterized in that the method for described calculating mean pixel number comprises calculating one weighted mean number of pixels

S[r wherein] be the element of described array S, r is 1,2 ..., R, and a _rBe S[r] a weighted index, and the luminous work of described backlight than D be described weighted mean number of pixels N ' function D[N ' (M) (M)], and the amplitude A of described backlight be described weighted mean number of pixels N ' function A[N ' (M) (M)].

12. flat display driving method as claimed in claim 11 is characterized in that described weighted index a _r〉=a _R+1

13. flat display driving method as claimed in claim 11 is characterized in that the luminous work ratio of described backlight

And D _LimitBe a critical work ratio of described backlight, N _MaxIt then is a contiguous pixels number.

14. flat display driving method as claimed in claim 13 is characterized in that described contiguous pixels number N _MaxMaximal value be 0.1 * I * J.

15. flat display driving method as claimed in claim 13 is characterized in that described critical work compares D _LimitMinimum value be 25%.

16. a flat-panel screens is characterized in that comprising:

One display panel;

One backlight is disposed at described display panel below;

One data control circuit be connected to described display panel and described backlight, and described data control circuit comprises:

One comparing unit is in order to receive and comparison one a M frame image data and a M-1 frame image data;

One frame image data storage unit is connected to described comparing unit, exports described comparing unit in order to described M～1 frame image data that will be stored in wherein; And

One lamp source control module is connected to described backlight, in order to control the driving of described backlight; Wherein said lamp source control module comprises that a job is than a controller and an amplitude controller, and the luminous work ratio of described backlight is to be controlled than controller by described work, and the luminous amplitude of described backlight then is to be controlled by described amplitude controller.

17. flat-panel screens as claimed in claim 16, it is characterized in that described data control circuit more comprises a frame image weight filter, be coupled to described comparing unit, in order to receiving the comparative result that described comparing unit is exported, and calculate the weight distribution of described comparative result.

18. flat-panel screens as claimed in claim 17 is characterized in that described frame image weight filter more comprises an array, is suitable for storing the described comparative result that described comparing unit is exported.

19., it is characterized in that described flat-panel screens is a LCD as claim 16 or 17 or 18 described flat-panel screens.

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