CN1898716A - Method and device for reducing line load effect - Google Patents

Abstract

The present invention relates to a method for processing data of a picture to be displayed on a display panel with persistent luminous elements in order to reduce load effect in said display means. The method comprises the following steps: computing, for each subfield, the amount of activated luminous elements in each line of luminous elements of the display panel, called line load, calculating, for each subfield, the maximal difference of line loads of two consecutive lines of the display panel, and selecting, for each subfield, a sustain frequency in accordance with its maximal load difference in order to reduce line load effect.

Description

Be used to reduce the method and apparatus of line load effect

Technical field

The present invention relates to such method, it is used to handle will be in the data with picture displayed on the display panel of lasting light-emitting component, so that reduce the load effect (load effect) in the described display module.

Background technology

High-contrast is the principal element that is used to estimate the image quality of each display technique.In this, always need white (peak white) brightness in peak, to realize good contrast ratio and to realize and the corresponding to good picture performance of environment light condition thus.On the other hand, the success of new display technique also needs balanced power consumption.For each active display, higher peak brightness is also corresponding to the higher power that flows in the electron device of display.Therefore, if do not carry out specific management, the enhancing of the peak brightness of then given electronics effect (electronic efficacy) will cause the increase of power consumption.So, use power management concepts usually, so that the power consumption of display is stable.Main thought after each power management concepts related with the white wild phase in peak is based on the variation of the peak brightness that depends on image content, so that make power consumption be stabilized to particular value as shown in Figure 1.In this figure, peak brightness reduces along with the increase of picture load.Make power consumption keep constant.

The notion of describing on Fig. 1 allows to avoid the overload of any power source and the maximum-contrast of given picture.Such notion is very suitable for the human visual system, and wherein, the human visual system can be dizzy under the situation of whole white picture (picture load=100%), and in fact to the dynamic sensitivity in the dark picture situation at (night that the moon for example, is arranged).Therefore, in order to increase the impression of the high-contrast on the dark picture, peak brightness is set as very high value, and it reduces under the situation of high energy picture (complete white).

Under the situation of the conformable display of for example cathode ray tube (CRT), power management is based on so-called ABM function (average electron beam restrictor), it is realized by simulated assembly, and it reduces the video gain as the function of the mean flow rate of measuring usually on the RC level.Under the situation of plasma display, the direct number of keeping pulse (light pulse) with every frame of brightness and power consumption interrelates.As shown in Figure 2, keep constant, be used for the white number of keeping pulse in peak along with reducing with the increase of the corresponding picture load of average power level (APL) of picture in order to make power consumption.

For example, by with minor function the average power level (APL) to picture P calculate:

$\mathrm{APL}\left(P\right)=\frac{1}{C\×L}\·\underset{X,Y}{\mathrm{\Σ}}1(x,y)$

Wherein, 1 (x is illustrated in has coordinate among the picture P y) that (C is the number of row for x, the brightness of pixel y), and L is the number of the line of picture P.

Subsequently, for each possible APL value,, fixedly keep the maximum number of pulse for the peak white pixel for the power consumption that makes PDP keeps constant.Owing to only can use integer to keep pulse, so only having limited number can be with the APL value.In theory, can be used for the peak white pixel and the number of keeping pulse that shows can be very high.In fact, if the picture load trends towards 0, then power consumption also trends towards 0, and the maximum number of keeping pulse that is used for constant power dissipation trends towards infinity.Yet the maximum number of keeping pulse of regulation maximum peak white (peak of the picture load for 0% is white) is subjected to the pot life of the frame that is used for keeping and the restriction of keeping the minimum duration of pulse.Fig. 3 illustrates the duration and the content of the frame that comprises with different weights 12 sons, wherein each son the keeping the cycle of arc chamber of comprising the addressing period of the arc chamber (cell) that is used to activate panel and being used to light the panel that (illuminate) activated.The duration of addressing period is all identical for each son, and the weight of the duration of keeping the cycle and son is proportional.When the picture load was higher, the number of catabiotic arc chamber was higher in preset time; So, keeping constant in order to make average power consumption, the duration of keeping the cycle should reduce.This is duration of keeping of frame to want high reason for low picture duty factor for high picture load.

In addition, white in order to realize high maximum peak, make the number of son field remain minimum, thereby guarantee that acceptable gray level describes (portrayal) (having some wrong contour effects), addressing speed is increased to maximum, thereby keep acceptable panel state (behavior) (response fidelity), and, to keep the duration of pulse remains minimum, but has acceptable effect.

But, in this stage, PDP manufacture view another problem that is called as load effect to illustrating below.As previously mentioned, the peak needs to shorten the duration of keeping pulse in vain.Yet this increase of keeping frequency has serious deficiency: it has increased load effect, when especially the xenon number percent in the gas of PDP arc chamber is higher.Fig. 4 illustrates this effect.It has represented the white of intersecting on black background.For the high maintenance frequency, the loss that causes owing to line capacity effect occurs, and has the strong influence of counter plate brightness.In high maintenance frequency mode (right part of Fig. 4), the white horizontal line of intersection is than low in the low brightness of keeping in the frequency mode (left part).This example shows line load effect.

Line load effect self is represented the dependence of sub-field brightness to its horizontal distribution.In this case, this is inessential, knows the load of son that is:, rather than knows the poor of load between two continuous lines that are used for same son.

When the group field distribution is " how much (geometrical) " (for example, being used to show artificial geometric scheme), compare with the video pictures that mainly is subjected to overall load effect infringement, line load effect is even more important.

Usually, load effect is not limited only to linear load, also relates to the overall load of the son field in the frame.In fact, if a son is used manyly than another by the overall situation, so,, will have less brightness on whole screen for it of whenever keeping the cycle owing to this load effect (in screen and electronic circuit, loss occurring).

Therefore, on the one hand, for the peak white mode, what need higher number keeps pulse and high maintenance frequency, and on the other hand, under the situation of peak white mode, panel will lose its homogeneity.This may have appreciable impact to natural scene as shown in Figure 5.

Load effect is described gray level as the form influence of a kind of over-exposed effect of gray level disappearance seeming.In this case, compare with the picture on the left side, the picture on the right seems with less position and is encoded.This is that the fact that has reduced brightness owing to a little comparing with the brightness that they should have sharp causes.In this case, if we consider to have two video levels of similar brightness, and, if among them is using such son field, so, to compare with another video level, its overall brightness will be low excessively, thereby introduce disturbing effect.

The purpose of method of the present invention is, the overall load effect that reduces directly line load effect that the capacity with line interrelates rather than can compensate by other method.Can use method of the present invention mutually independently with those methods when having selected the PC pattern, perhaps, because they are compatible, so, can except one among them, additionally use method of the present invention.

Generally, the present invention's distribution curve (profile) of being based on the linear load of each son is analyzed and to be determined that this son field is more important still more inessential for line load effect.If detect such son field, then reduce it and keep frequency, so that the load effect minimum.

Summary of the invention

The present invention relates to a kind of method and apparatus that is used for reducing at such load effect of display panel with lasting light-emitting component.

The present invention relates to such method, it is used for handling in the image duration that comprises a plurality of sons field will be in the data with picture displayed on the display panel of lasting light-emitting component, wherein each son field comprises: address phase (phase), during it, activate or do not activate the light-emitting component of panel according to picture data; And the maintenance stage, during it, light the light-emitting component of activation by keeping pulse.It may further comprise the steps:

-be the quantity of the light-emitting component of the activation in the every line of each son light-emitting component of calculating display panel, it is called as linear load,

-be that the maximum of linear load of each son two continuous lines calculating display panel is poor, and

-poor according to the maximum load of each son field, and be that frequency is kept in the selection of each son, so that reduce line load effect.

Preferably, only carry out the calculating of maximum load difference greater than the line of minimum load for its load.For example, this minimum load equal the light-emitting component in the line of display panel quantity 10%.

In a particular embodiment, on a plurality of frames before present frame and the described present frame, the maximum load of calculating for each son between two continuous lines of display panel is poor, so that avoid the change of the picture brightness when some less modifications take place.So, the maximum load difference that is used to select to keep frequency is the mean value of the maximum load difference calculated for described a plurality of frames.

Preferably, so that show the number of light-emitting component of current picture and the selected frequency of keeping that is used for described son, and adjust number of keeping pulse of each son according to being activated.

According to the present invention, also can by adjust each the son number of keeping pulse and the compensating load effect.

In this case, this method is further comprising the steps of:

-picture data is encoded to sub-field data,

-calculate based on described sub-field data each the son load, and

-adjust the number of keeping pulse of son field based on sub load, so that between the weight of brightness that produces by the lasting light-emitting component that is used for the son field and son field, have identical proportionate relationship.

For the number of keeping pulse of adjusting the son field, this method may further comprise the steps:

-first number of keeping pulse of described son is provided,

-based on the load of described son with keep the number of pulse, and stipulate the corrected value that will be deducted for described first number of keeping pulse,

-from described first number of keeping pulse, deduct described corrected value, so that have second number of keeping pulse that is used for described son.

In a preferred embodiment, utilize as the load of the son of input signal and keep the number of pulse, advise the corrected value of stator field by look-up table.Can at least two kinds different modes realize being stored in corrected value in the look-up table.

In first embodiment, the calculated correction value by following steps:

-for 1 and the first number M that keeps pulse of the son of highest weighting between all first numbers of keeping pulse and a plurality of non-0 load that comprise, measure the brightness that a plurality of light-emitting components by display module produce,

-in each and the described load in described first number of keeping pulse each, determine with in the similar number of keeping pulse and the described load the highest one measure with reference to brightness brightness decay Comparatively speaking, and

-in each and the described load in described first number of keeping pulse each, by determined brightness decay and described first number of keeping pulse are multiplied each other, and calculated correction value.

In a second embodiment, owing to this decay not along with the number of keeping pulse changes a lot, so, also might be and calculated correction value for the given number of keeping pulse.In the case, realize being included in corrected value in the look-up table by following steps:

-for specific first number of keeping pulse and a plurality of non-0 load, measure brightness by a plurality of light-emitting components generations of display module,

-in the described load each, determine with in the described load the highest one measure with reference to brightness brightness decay Comparatively speaking, and

-for each and described specific first number of keeping pulse in the described load, by determined brightness decay and described specific first number of keeping pulse are multiplied each other, and calculated correction value.

For fear of error at measurment, preferably, specific first number of keeping pulse is greater than 20.

In improving embodiment, method of the present invention also comprises such step, it is used to readjust second number of keeping pulse of a plurality of sons, so as with second number of keeping pulse of each son pro rata, in each son, redistribute the quantity of keeping pulse that is deducted.

Improve among the embodiment at another, based on each the son load and adjust each the son number of keeping pulse before, readjust the described number of keeping pulse, be approximately equal to fixing desired value so that be used for the required average power level of the display module of display frame.

The invention still further relates to such device, it is used for handling in the image duration that comprises a plurality of sons field will be in the data with picture displayed on the display panel of lasting light-emitting component, wherein each son field comprises: address phase, during it, activate or do not activate the light-emitting component of panel according to picture data; And the maintenance stage, during it, light the light-emitting component of activation by keeping pulse.It comprises:

-be used to each son calculate the activation in the every line of light-emitting component of the display panel be called as linear load light-emitting component quantity and be used to each son to calculate the assembly of maximum difference of linear load of two continuous lines of display panel,

-be used for being each sub to select to keep frequency so that reduce the assembly of line load effect according to each maximum load difference of sub.

The invention still further relates to Plasmia indicating panel, it comprises a plurality of lasting light-emitting component and the described device of arranging in the mode of row and column that is used to reduce load effect.

Description of drawings

Example embodiment of the present invention is in the accompanying drawings by diagram, and illustrated in greater detail in the following description, in the accompanying drawing:

Fig. 1 is for representing according to the peak brightness of the picture load in traditional Plasmia indicating panel and the figure of power consumption;

Fig. 2 is the figure that be used for the peak white number of keeping pulse of expression according to the picture load in traditional Plasmia indicating panel;

Fig. 3 is the duration according to the frame of the picture load in traditional Plasmia indicating panel;

Fig. 4 is the load effect in keeping frequency when higher, traditional Plasmia indicating panel;

Fig. 5 is the over-exposed effect of the natural scene that causes owing to load effect;

Fig. 6 is the histogram of the load of video pictures and associated each son that this picture is shown;

Fig. 7 is the figure that each linear load of sub of the video pictures that is used for displayed map 6 is shown;

Fig. 8 is the histogram of the load of computer picture and associated each son that this picture is shown;

Fig. 9 is the figure that illustrates for each linear load of sub of the video pictures that is used for displayed map 8;

Figure 10 is the computer picture of Fig. 8, wherein, shows line load effect;

Figure 11 is that illustrating according to the maximum load difference between two continuous lines of the panel that is used for corresponding son field will be a son curve of selecting of keeping frequency;

Figure 12 illustrates to adapt to generation frequency, that be used for the number of keeping pulse of each son field of keeping of son field;

Figure 13 is the curve that illustrates according to the number of keeping pulse in the frame of picture load;

Two curves that are used for the white minimizing of keeping pulse in peak that Figure 14 causes owing to the modification of keeping frequency for diagram;

Figure 15 is the block diagram of realizing according to the circuit of plasma display system of the present invention;

Figure 16 is the figure that illustrates according to the brightness effect of load;

The block diagram that the circuit of the plasma display system of the adjustment of keeping pulse of the son that Figure 17 realizes for the load based on son is realized; And

Figure 18 is LUT, and it comprises that the number of keeping pulse for each son field will be deducted so that the corrected value of compensating load effect.

Embodiment

Method of the present invention is based on the analysis of the linear load of each son field, so that determine that this son field is more important still more inessential for so-called " line load effect ".If detect such son field, then reduce it and keep frequency, so that the load effect minimum.

In the present embodiment, frame comprises 11 son fields with following weight:

1-2-3-5-8-12-18-27-41-58-80(∑＝255)

In order to understand type better, two picture sequences of following surface analysis to the picture sequence of line load effect sensitivity.First is to the unessential video sequence of line load effect, and second is to the prior computing machine sequence that comprises geometric scheme of line load effect.

The analysis of video sequence

Video sequence shown in the left side of Fig. 6 is represented " European man's face ".By the histogram in figure left side and following table, and provide overall load for an every son of that sequence that on WVGA screen, shows with 852 * 480 * 3 arc chambers (or light-emitting component).The quantity (or number) of the activation arc chamber of the panel of the load of son field during described son field.In the table below, son loading liquifier is shown the number percent of total quantity of the arc chamber of panel.

The son field	Weight	Load
				1	1	63.24％
2	2	74.69％
			3	3	73.94％
4	5	79.73％
			5	8	88.45％
6	12	77.34％
			7	18	32.67％
8	27	81.26％
			9	41	12.12％
10	58	3.94％
			11	80	0.43％

In the overall load of son field, there is greatest differences: be adjacent son (SF1, SF2, SF3, SF4, SF5, SF6, a SF8) and compare, less add carrier field SF7.Because a son SF7 will be brighter than other son field pro rata, so this has introduced so-called over-exposed or quantization effect.

The line that pursues of representing the overall load of each son field by Fig. 7 distributes.Transverse axis is represented the line (480 lines among the WVGA) of picture, and vertical pivot is represented the number (reaching 852 among the WVGA) of the pixel of lighting of every line.Drawn curve for each son field.

From then among the figure, as can be seen, for son SF0, SF1, SF2, SF3, SF4, SF5 and SF7, the linear load quite stable, and for other son, exist more to change.In either case, the maximum difference between two continuous lines is 105.In this case, the load difference of the brightness of a son between two continuous lines is not very high, and is not very big problem.Therefore, under the situation of such picture, line load effect is not annoying.

Be used for the analysis of the computer picture (pattern PC) of monitor

Computer picture shown in the left side of Fig. 8 is the histogrammic picture with some texts, wherein, as can be seen: the title " analysis of line load effect " on the dark areas on the top of picture, and the note " result shows the serious problems of image quality " on the white portion of the bottom of picture.The histogram on the right side by Fig. 8 and following table, and provide the overall load of the every son that is used for this sequence:

The son field	Weight	Load
				1	1	54.66％
2	2	68.72％
			3	3	62.00％
4	5	59.02％
			5	8	72.33％
6	12	78.64％
			7	18	58.30％
8	27	42.17％
			9	41	74.87％
10	58	77.90％
			11	80	73.58％

Compare with the situation of video sequence, in this sequence, the load of each height field is more even.The line that pursues of representing the overall load of each son field by Fig. 9 distributes, to compare with Fig. 7.Exist serious discontinuously in linear load of each son, and the max line load difference between two continuous lines is much higher.For a son SF9 and SF10, max line load difference equals 590.For this a little, it has introduced the greatest differences from a line to the brightness of next bar line.

In this sequence, as shown in figure 10, the enhancing of the brightness of the background after the dark areas by title, and show load effect self.Bottom at picture is then opposite.Owing to load corresponding line more, so white portion has been introduced the reducing of brightness of background.

Keep the frequency adjustment

Main thought of the present invention is to adjust according to the load of each son field the frequency of keeping of each son field.More specifically, for each son and to analyze two linear loads between the continuous line poor, and, according to its max line load difference and the chooser field keep frequency.

Preferably, do not analyze line with the low load that is used for current son field.In fact, if sufficiently do not use a son field, the influence of then assessing the load of this son field is nonsensical.Therefore, in the analysis of the difference between two continuous lines, we are restricted to analysis on the line with arc chamber of lighting of at least 10%.This restriction is called as MinLoad.

Subsequently, for each son, following calculating be used for two continuous line L of son n and the linear load difference Diff between the L+1 (L, n):

Wherein, (L n) is the load that is used for the line L of a son n to Load.It is poor to calculate the max line load that is used for a son n that is called as MaxDiff (n) subsequently: MaxDiff (n)=MAX _{For all L}(Diff (L; N)).

The max line load of each son n that provides the computer picture that is used for Fig. 8 by following table is poor:

A son n	MaxDiff(n)
		0	391
1	465
		2	462
3	414
		4	489
5	567
		6	337
7	278
		8	575
9	590
		10	590

Subsequently, depend on as by the indicated value MaxDiff of the curve of Figure 11 (n), and adjust the frequency of keeping of each son n.This curve is stored in the look-up table (LUT).The frequency of keeping of a son n reduces along with the increase of MaxDiff (n).

Depend on these values, subsequently, select the frequency of keeping of shown picture according to reservation table.When the maximum load difference was low, line load effect was lower, and keep frequency can be higher (for example, 250kHz).On the contrary, when the maximum load difference was higher, line load effect was higher, and keep frequency should be lower (for example, 200kHz) so that its minimum.Must be noted that when the percentage of the xenon in the gas of arc chamber was important, line load effect was also higher.

In the present invention, by the wisdom of keeping frequency is selected, might reduce load effect with 2 the factor.

Should cautiously carry out such adjustment of keeping frequency, to avoid any violent change of the picture brightness when less change of picture taken place.Therefore, preferably for example reduce load effect lentamente by termporal filter.

Thus, preferably, on the previous frame of T to maximum load difference MaxDiff (n about a son n and frame t; T) carry out filtering, with the following value of providing MaxDiff (n; T):

$\mathrm{MaxDiff}(n;t)=\frac{1}{T}\·\underset{k=t-T+1}{\overset{k=t}{\mathrm{\Σ}}}\mathrm{MaxDiff}(n;t).$

For example, as the value MaxDiff (n that switches (cut) when detection components detects new scene, a T previous frame by scene; T) and MaxDiff (n; T) directly be considered to equal MaxDiff (n; T).

Can be by calculating average power level for each picture, realize method of the present invention mutually concurrently with foregoing power management method, and method of the present invention is used for revising the total quantity of keeping pulse of frame, and is used to revise the quantity of keeping pulse of each son field thus.

Optimizing the behavior of keeping frequency of each son field has revised with generating the pot life of keeping pulse.In fact, if the frequency of keeping of high weight son reduces, then with generate its all to keep time of pulse longer, and, generate them if having insufficient time to, then it can limit the peak and is worth in vain.For example, if the frequency of keeping of most important son (the son field with highest weighting) is reduced to 200kHz from 250kHz, so, this required time of pulse of keeping of sub increases by 20%.

Therefore, be necessary to keep number of keeping pulse that frequency is revised each son, carry out all and keep pulse so that have time enough according to selected.

To this, carry out graphic operation by Figure 12:

-use maximum load difference MaxDiff (n; T) or the MaxDiff (n under the filtering situation; T), so that select to be used to adjust the adjustment coefficient Adj (n of the number of keeping pulse of a son n; T); This coefficient with by frequency (for example, 250kHz) is reduced to institute's selected frequency and the number that reduces of keeping pulse that obtains is corresponding from maximum frequency; For example, if MaxDiff is (n; T)=640, so, the selected frequency of keeping is 200kHz (20%), and so, coefficient value was 0.8 (having lacked for 20% time).

-concurrently, by the video level summation to all pixels of picture t, and be and the corresponding picture of frame t calculates average power level APL (t),

-with coefficient Adj (n; T) multiply by the maximum number of keeping pulse (it is called as MaxSustainNb (n)) that is used for a son n, so that obtain the new maximum number MaxSustainNb ' that keeps pulse (n).The maximum number MaxSustainNb (n) that keeps pulse is corresponding with the number of keeping pulse that is used for 0 picture load (APL=0).

-to being used for the new maximum number summation of keeping pulse of all son fields, to provide the total quantity of keeping pulse after adjusting, it is called as Sum (t): $\mathrm{Sum}\left(t\right)=\underset{n=0}{\overset{n=11}{\mathrm{\Σ}}}\mathrm{MaxSustainN}{b}^{\′}(n,t).$

-will be worth Sum (t) by reverse APL table to be converted to average power level APL ' (t).This table is worth corresponding immediate APL for this that adjust each total quantity Sum (t) that keeps pulse afterwards and provide and keep pulse.The value that is stored in this table is followed the inversion of the curve of Figure 13.For example, if Sum (t) equals 800, then APL ' (t) equals 16%.

Two of-comparisons are worth APL (t) and APL ' is (t), and, select to be called as APL " maximal value (t); For example, if APL (t)=20% and APL ' are (t)=16%, then APL " (t)=20%.

-subsequently, " (t) be converted to the number of keeping pulse that is used for each son n, it is called as SustainNb (n) will to be worth APL by the APL table.The value that is stored in this table is followed the curve of Figure 13.According to this curve, the total quantity of keeping pulse in the frame reduces along with the increase of picture load APL.

Figure 14 illustrates APL ' (t) greater than the situation of APL (t).In this case, it is white to reduce maximum peak, can be not longer so that be used to generate the described number of sustain duration of keeping pulse that reduces.

Circuit is realized

Figure 15 illustrates the possible circuit of method of the present invention and realizes.The input picture data D that will be used for three look RGB _InBe forwarded to gamma (degamma) piece 10, wherein, data applied following operation: $D_{\mathrm{out}}=65535\×{\left(\frac{D_{\mathrm{in}}}{1023}\right)}^{\mathrm{\γ}},$ Wherein, γ=2.2.In our example, the input data comprise 10, and output data comprises 16.Subsequently, handle this data by piece 12, so that be provided for the average power level APL (t) of each frame t as previously mentioned, wherein, $\mathrm{APL}\left(t\right)=\frac{1}{C\×L}\·\underset{x,y}{\mathrm{\Σ}}1(x,y).$

Concurrently, handle by the data of going 10 outputs of gamma piece, so that obtain 8 bit data (is 24 for 3 looks) by jitter block 11.Subsequently, handle the data that provided by jitter block 13 by encoding block 13, wherein, encoding block 13 is changed them by LUT field data (being 11 bit data) under this situation.Subsequently, sub-field data is stored in the frame memory 14, and, before showing, be converted into serial data by display panel.

In order to realize method of the present invention, this circuit comprises computing block 15, and it handles the data by jitter block 11 outputs.Computing block 15 calculates the maximum load difference MaxDiff (n between two continuous lines of panel for each frame t and each n; T).Subsequently, by 16 pairs of values of wave filter MaxDiff (n; T) carry out time filtering, so that obtain MaxDiff ' (n; T).Do not switch if detect scene, then do not have filtering.

The one LUT 17 uses MaxDiff ' (n; T), with according to described MaxDiff (n; T) value and be provided for each son n as shown in figure 11 keep frequency SustainFreq (n).To be worth SustainFreq (n) and be sent to the control module of display panel.

Also by LUT 18 use value MaxDiff ' (n; T), so that be identified for the adjustment coefficient Adj (n) of each son n as previously mentioned.This coefficient subsequently, uses multiplier 19, so that be multiply by the maximum number MaxSustainNb (n that keeps pulse in the frame; And the result is value MaxSustainNb ' (n t); T).

In piece 20, to the maximum number MaxSustainNb ' (n that keeps pulse of all son fields; T) summation is as follows: $\mathrm{Sum}\left(t\right)=\underset{n=0}{\overset{n=11}{\mathrm{\Σ}}}\mathrm{MaxSustainN}{b}^{\′}(n,t).$

As previously mentioned, based on this new total quantity Sum that keeps pulse (t), reverse APL table 21 provides average power level APL ' (t).Subsequently, select APL (t) and the APL ' maximal value between (t) by piece 22.Subsequently, use this value APL by APL table 23 " (t), in case for each son n provides should be by the total quantity SustainNb that keeps (n) that panel adopted, with display frame t.

According to the present invention, also can by adjust each the son number of keeping pulse and the compensating load effect.Be each son calculated correction value.Depend on the load of son and keep the number of pulse, this value is reduced to the number of keeping pulse of son field.Can be poor according to the maximum load of each son field, and the adjustment of keeping frequency of these methods and each son field is combined.Also can use the method independently.

Preferably, the pulse of keeping that will deduct pro rata with their the new quantity of keeping pulse is re-assigned to son, so that avoid the loss (peak brightness that reduces) of brightness.

Preferably, for example, after the calculating of the picture load by calculating average power level (APL) and readjusting after number of keeping pulse of (rescale) each son, realize set-up procedure, so that make the power consumption of display panel keep constant.

In the preliminary step of allowing (facultative preliminary step), for example, readjust the number of keeping pulse of son field, so that make power consumption keep constant by APL as shown in Figure 3.In the end of this step, 200 of maximum peak Bai Kecong keep pulse to nearly 1080 keep pulse and do not wait.

The method comprises three key steps:

-son load calculation step;

-step of the number of keeping pulse of each son field is adjusted in a load according to son; And

-preferably, the step of redistributing of keeping pulse that is deducted.

A son load calculation

This step comprises: at each sub-field period that is used for wanting picture displayed, the light-emitting component that be lighted is counted.

Can be by using counter for each son field to counting with the corresponding sub-field data of light-emitting component of " connection (ON) ", and easily realize this step.

Keep the set-up procedure of pulse

This step causes the regulation of the number of keeping pulse of each son that is used to make the load effect minimum.

For having 1080 white values in peak of keeping pulse, the number of keeping pulse of the son field of highest weighting is 80/225*1080=339.So, because decay of all son fields that load effect causes, be necessary to keep the maximal value of pulse and measure the panel luminance state up to 340 from 1 minimum value of keeping pulse in order to determine.Obviously, not to measure all values, but measure the subclass of described value.Because load effect is greater than or less than proportional effect, so, other value calculated by interpolation.

For example, the square region of screen is measured.For example, the picture load is developed from 8.5% up to 100%.Only keep the son of pulse number, and the gray level in this zone is encoded by all with continuous described subclass.In the table below, only presented the example (keep pulse to 130 from 1 and keep pulse, wherein load changes to 100% from 8.5%) of measurement result for some measuring points.With every square metre of candela (cd/m ²) mode represent the luminance state result.In the left column of table, vertically provide load, and in the top line of table, laterally provided the number of keeping pulse.This table comprises the quantity that reduces of value, so that simplicity of explanation of the present invention.

		Keep pulse number
																			1	2	4	8	10	20	30	40	50	60	70	80	90	100	110	120	130
		Load (%)	8.50％	1.20	2.37	4.66	9.19	11.31	22.29	32.92	43.20	53.15	62.75	72.01	80.93	89.50	97.73	105.62																		113.17	120.37
12.00％	1.19																		2.33	4.58	9.02	11.10	21.81	32.25	42.34	52.06	61.64	70.49	79.36	87.65	95.68	103.72	110.81	118.37
			14.50％	1.18	2.31	4.52	8.88	10.92	21.49	31.71	41.65	51.24	60.49	69.49	77.90	86.18	94.40	101.86																	108.25	116.03
17.00％	1.18																		2.28	4.47	8.76	10.79	21.16	31.28	41.11	50.53	59.48	68.38	76.89	85.00	92.78	100.27	107.46	114.11
			19.50％	1.17	2.26	4.41	8.64	10.62	20.84	30.78	40.49	49.76	58.68	67.30	75.63	83.65	91.33	98.97																	105.84	112.59
21.00％	1.16																		2.25	4.38	8.56	10.52	20.66	30.55	40.10	49.35	58.09	66.78	75.01	82.89	90.55	97.90	104.98	111.40
			23.00％	1.15	2.23	4.34	8.49	10.42	20.41	30.16	39.74	48.77	57.48	65.98	74.10	82.01	89.47	96.94																	103.71	110.28
24.50％	1.14																		2.22	4.31	8.41	10.33	20.26	29.89	39.34	48.40	56.92	65.47	73.55	81.25	88.79	95.97	102.76	109.19
			26.00％	1.13	2.20	4.28	8.33	10.24	20.05	29.65	38.99	47.95	56.49	64.80	72.77	80.30	87.89	95.08																	101.94	107.49
27.00％	1.12																		2.19	4.25	8.29	10.18	19.93	29.45	38.79	47.69	56.11	64.43	72.32	80.13	87.46	94.59	101.28	107.59
			29.00％	1.11	2.15	4.20	8.21	10.08	19.75	29.12	38.36	47.12	55.47	63.79	71.63	79.24	86.46	93.51																	100.31	106.34
30.00％	1.10																		2.13	4.17	8.15	10.01	19.59	28.96	38.15	46.79	55.15	63.32	71.07	78.66	85.89	92.98	99.53	105.77
			31.00％	1.09	2.11	4.13	8.10	9.95	19.47	28.77	37.90	46.51	54.80	62.91	70.69	78.18	85.39	92.37																	98.93	105.07
32.50％	1.09																		2.09	4.09	8.02	9.87	19.32	28.56	37.58	46.00	54.39	62.40	70.06	77.64	84.63	91.56	98.18	104.38
			33.50％	1.09	2.08	4.05	7.92	9.79	19.19	28.35	37.29	45.68	53.98	61.91	69.61	76.70	84.17	91.05																	97.48	103.52
34.50％	1.08																		2.07	4.04	7.91	9.74	19.09	28.22	37.05	45.49	53.64	61.60	69.27	76.58	83.65	90.51	97.00	102.88
			39.00％	1.07	2.04	3.95	7.73	9.47	18.58	27.50	36.13	44.28	52.33	59.92	67.55	74.56	81.49	88.14																	94.54	100.49
42.50％	1.05																		2.02	3.89	7.56	9.28	18.18	26.89	35.33	43.38	51.14	58.83	66.05	73.15	80.00	86.52	92.49	98.15
			46.00％	1.03	2.00	3.83	7.42	9.12	17.81	26.42	34.62	42.51	50.20	57.54	64.66	71.60	78.25	84.62																	90.61	96.14
49.00％	1.01																		1.98	3.78	7.31	8.96	17.55	25.92	34.08	41.96	49.30	56.58	63.56	70.38	76.87	83.37	89.09	94.65
			52.00％	0.99	1.95	3.74	7.20	8.84	17.20	25.50	33.47	41.25	48.50	55.69	62.72	69.10	75.63	81.93																	87.81	93.03
55.00％	0.98																		1.91	3.68	7.11	8.70	16.99	25.09	33.09	40.62	47.86	54.81	61.64	68.31	74.41	80.56	86.38	91.76
			58.00％	0.97	1.87	3.62	7.01	8.57	16.72	24.75	32.61	40.03	47.05	54.10	60.67	67.18	73.41	79.30																	85.01	90.22
60.50％	0.96																		1.84	3.57	6.93	8.49	16.52	24.44	32.26	39.60	46.56	53.42	59.95	66.36	72.44	78.35	83.97	89.12
			63.00％	0.96	1.82	3.52	6.86	8.41	16.37	24.12	31.91	39.12	45.89	52.74	59.41	65.64	71.75	77.63																	83.21	88.15
65.50％	0.95																		1.81	3.48	6.80	8.33	16.21	23.95	31.64	38.73	45.55	52.35	58.79	65.01	71.01	76.85	82.39	87.38
			67.50％	0.95	1.80	3.46	6.74	8.27	16.10	23.79	31.40	38.39	45.26	52.00	58.38	64.62	70.50	76.31																	81.78	86.78
70.00％	0.94																		1.80	3.43	6.68	8.20	15.98	23.64	31.12	38.10	44.90	51.55	57.95	64.11	70.07	75.74	81.15	86.09
			78.50％	0.93	1.77	3.36	6.50	8.01	15.67	23.13	30.44	37.17	43.95	50.26	56.59	62.61	68.44	74.21																	79.29	84.08
86.00％	0.93																		1.75	3.32	6.37	7.82	15.29	22.61	29.70	36.44	42.89	49.18	55.52	61.23	67.21	72.56	77.81	82.26
			92.50％	0.92	1.74	3.28	6.29	7.69	14.97	22.17	29.22	35.85	42.07	48.46	54.45	60.27	65.77	71.18																	76.28	80.97
100％	0.91																		1.73	3.24	6.19	7.58	14.75	21.79	28.76	35.28	41.48	47.64	53.52	59.21	64.61	69.95	74.98	79.59

Based on this determination step, can calculate the brightness effect for each number of keeping pulse and load, to provide and to be used for effect (being 8.5%) of each son that minimum non-0 load compares under present case.Provided the efficacy outcomes that is directed to the load in the previous table and keeps the value of pulse number in the table below.In this table, 100% effect is distributed to the value that obtains for 8.5% load.

		Keep pulse number
																				1	2	4	8	10	20	30	40	50	60	70	80	90	100	110	120	130	Mean
		Load (%)	8.50％	100	100	100	100	100	100	100	100	100	100	100	100	100	100	100	100																			100	100％
12.00％	99.24																			98.58	98.24	98.15	98.11	97.88	97.98	98.00	97.96	98.24	97.89	98.07	97.94	97.90	98.20	97.92	98.34	98.01％
			14.50％	98.67	97.45	96.93	96.65	96.54	96.43	96.34	96.41	96.40	96.40	96.50	96.26	96.29	96.59	96.44	95.66																		96.40	96.36％
17.00％	98.10																			96.46	95.79	95.30	95.35	94.95	95.04	95.16	95.07	94.80	94.96	95.01	94.98	94.93	94.94	94.96	94.81	95.01％
			19.50％	97.33	95.61	94.56	94.05	93.86	93.50	93.52	93.71	93.62	93.52	93.47	93.45	93.46	93.45	93.70	93.53																		93.54	93.57％
21.00％	96.95																			95.04	93.94	93.20	93.00	92.69	92.82	92.83	92.85	92.57	92.73	92.69	92.62	92.66	92.69	92.76	92.55	92.74％
			23.00％	96.19	94.19	92.98	92.35	92.05	91.58	91.63	91.97	91.77	91.60	91.62	91.57	91.63	91.55	91.78	91.64																		91.62	91.70％
24.50％	95.24																			93.77	92.36	91.50	91.27	90.89	90.80	91.05	91.07	90.71	90.92	90.88	90.78	90.85	90.86	90.80	90.71	90.91％
			26.00％	94.10	93.06	91.75	90.70	90.53	89.97	90.08	90.24	90.21	90.02	89.99	89.92	89.73	89.93	90.02	90.08																		89.30	90.06％
27.00％	93.33																			92.63	91.22	90.25	89.99	89.44	89.48	89.79	89.73	89.41	89.48	89.37	89.53	89.49	89.56	89.50	89.38	89.56％
			29.00％	92.19	91.08	90.08	89.30	89.13	88.61	88.46	88.79	88.66	88.40	88.58	88.51	88.54	88.46	88.53	88.64																		88.34	88.61％
30.00％	91.62																			90.23	89.46	88.70	88.51	87.91	87.97	88.31	88.03	87.89	87.93	87.83	87.89	87.88	88.03	87.95	87.87	88.01％
			31.00％	91.24	89.38	88.67	88.20	87.97	87.36	87.40	87.72	87.51	87.33	87.36	87.36	87.35	87.38	87.45	87.42																		87.29	87.47％
32.50％	90.86																			88.53	87.80	87.30	87.19	86.67	86.76	86.98	86.55	86.68	86.66	86.58	86.75	86.60	86.69	86.76	86.72	86.74％
			33.50％	90.48	88.10	86.92	86.20	86.53	86.09	86.12	86.32	85.95	86.03	85.98	86.02	85.69	86.13	86.20	86.14																		86.01	86.10％
34.50％	90.29																			87.68	86.57	86.10	86.04	85.65	85.74	85.76	85.58	85.48	85.55	85.60	85.56	85.59	85.69	85.71	85.47	85.66％
			39.00％	89.14	86.26	84.64	84.10	83.69	83.36	83.56	83.62	83.32	83.40	83.22	83.47	83.30	83.38	83.45	83.54																		83.49	83.44％
42.50％	87.81																			85.41	83.41	82.25	82.00	81.59	81.70	81.77	81.62	81.49	81.70	81.62	81.73	81.85	81.92	81.73	81.54	81.73％
			46.00％	85.71	84.42	82.09	80.70	80.60	79.91	80.26	80.14	79.99	80.00	79.91	79.90	80.00	80.06	80.11	80.06																		79.87	80.08％
49.00％	83.81																			83.57	81.04	79.50	79.16	78.76	78.74	78.88	78.95	78.56	78.58	78.55	78.64	78.65	78.93	78.72	78.64	78.76％
			52.00％	82.48	82.29	80.16	78.35	78.13	77.19	77.45	77.48	77.61	77.28	77.33	77.51	77.21	77.38	77.57	77.60																		77.29	77.48％
55.00％	81.52																			80.59	79.02	77.35	76.89	76.24	76.21	76.59	76.43	76.27	76.11	76.17	76.33	76.13	76.27	76.33	76.23	76.33％
			58.00％	80.57	79.18	77.70	76.25	75.78	75.03	75.20	75.48	75.32	74.97	75.14	74.97	75.06	75.11	75.08	75.12																		74.95	75.19％
60.50％	80.00																			77.90	76.56	75.45	75.00	74.14	74.25	74.67	74.50	74.21	74.19	74.08	74.15	74.12	74.18	74.20	74.04	74.31％
			63.00％	79.62	77.05	75.42	74.70	74.34	73.47	73.28	73.85	73.61	73.13	73.24	73.41	73.34	73.42	73.50	73.53																		73.23	73.51％
65.50％	79.24																			76.63	74.63	74.00	73.60	72.72	72.76	73.22	72.87	72.59	72.70	72.65	72.64	72.66	72.76	72.80	72.60	72.83％
			67.50％	78.86	76.20	74.10	73.35	73.11	72.22	72.28	72.67	72.24	72.12	72.21	72.14	72.20	72.14	72.25	72.26																		72.09	72.32％
70.00％	78.67																			75.92	73.49	72.65	72.49	71.69	71.82	72.04	71.68	71.55	71.58	71.61	71.63	71.70	71.71	71.71	71.53	71.77％
			78.50％	77.90	74.79	72.08	70.75	70.76	70.30	70.27	70.45	69.94	70.03	69.79	69.93	69.96	70.02	70.26	70.06																		69.85	70.15％
86.00％	77.14																			74.08	71.20	69.35	69.15	68.60	68.68	68.75	68.57	68.35	68.30	68.60	68.41	68.77	68.70	68.76	68.34	68.64％
			92.50％	76.57	73.51	70.32	68.40	68.00	67.17	67.36	67.64	67.46	67.04	67.30	67.28	67.34	67.29	67.39	67.40																		67.27	67.39％
100％	76.00																			72.95	69.53	67.40	66.97	66.18	66.20	66.57	66.38	66.11	66.16	66.13	66.15	66.11	66.22	66.25	66.12	66.29％

Can be each son and release the brightness decay of representing load effect from these effect values:

Decay=100%-effect

Previous having expressed: in fact, load effect is considerably irrelevant with the number of keeping pulse.In fact, if we get rid of for low-down keep pulse number (wherein because brightness is low excessively, so, may make a lot of mensuration failures) and the value that obtains, then as can be seen, generally, for the decay quite stable of given picture load.Effect all can be near the mean value (not considering initial value) of each.The left column of table has provided this mean value that is used for each load.Figure 16 shows the curve of diagram effect to the mean value of load.As seeing on this curve, effect is quite dull and level and smooth to the differentiation of load.This is the reason that might calculate pad value (representative load effect) by the interpolation of measuring point for some load values.This curve is used for calculating the corrected value that is used for each son field.

Load for 100% and obtain minimum effect (66.29%).It is corresponding to 33.71% brightness decay.

In order irrespectively to have the uniform luminance state of son, the present invention proposes: adjusts the number of keeping pulse of every son, to obtain 66.29% effect for each son field with load.For example, for should have 107 keep pulse the son, after readjusting by APL:

If the ■ load is 100%, attonity then, and, keep 107 of current son time to keep pulse.

In this case, keep pulse to keep the brightness of son of pulse identical with having 107 * 0.6629=71 for 107, wherein do not have brightness decay.

If the ■ load only is 70%, then effect is 71.77%.For realizing the brightness identical, be necessary x the correction of keeping pulse of the following equation of application verification with 100% load: (107-x) * 0.7177=71.In this case, x=8.Correction comprises: for the theoretical number of keeping pulse of son field, keep pulse with 8 and deduct.

If the ■ load is 30%, then effect is 88.01%.For realizing the brightness identical, be necessary x the correction of keeping pulse of the following equation of application verification with 100% load: (107-x) * 0.8801=71.In this case, x=26.Correction comprises: for the theoretical number of keeping pulse of son field, keep pulse with 26 and deduct.

If the ■ load is 17%, then effect is 95.01%.For realizing the brightness identical, be necessary x the correction of keeping pulse of the following equation of application verification with 100% load: (107-x) * 0.9501=71.In this case, x=32.Correction comprises: for the theoretical number of keeping pulse of son field, keep pulse with 32.

This set-up procedure that can be used for a son SFn by following equation explanation:

NB ₂[SFn]＝NB ₁(SFn)-Corr[SFn，Load(SFn)]

Wherein,

■ NB ₁(SFn) be the number of keeping pulse of the son SFn before adjusting,

■ NB ₂(SFn) be the number of keeping pulse of the son SFn after adjusting, and

■ Corr[SFn, Load (SFn)] for for its load (charge) being the corrected value that the son SFn of Load (SFn) calculates.

In distortion (variant), owing to brightness decay not along with the number of keeping pulse changes a lot, so, might be in order to realize corrected value can be only quote the load of (precite) in advance and measure the brightness that a plurality of light-emitting components by display panel produce for keep pulse and all of given number.Subsequently, in the described load each and determine and value for the brightness decay of comparing with reference to brightness of the highest mensuration in the described load.Subsequently, can be by determined brightness decay and described specific first number of keeping pulse be multiplied each other, and be each and the described specific first number calculated correction value of keeping pulse in the described load.

What deducted keeps redistributing of pulse

Formerly in the step, the syndrome field is to provide the maximal value of 66.29% brightness.Thus, reduced the peak-peak brightness of display.

According to the present invention, proposed: redistribute the quantity of keeping pulse that removes during the step formerly pro rata by the number of keeping pulse new in each son, and readjust number of keeping pulse of each son with it.

To this, the corrected value of all son fields is sued for peace by counter.This and be called as CorrSum:

$\mathrm{CorrSum}=\underset{n=0}{\overset{n=10}{\mathrm{\Σ}}}\mathrm{Corr}[\mathrm{SFn};\mathrm{Load}\left(\mathrm{SFn}\right)]$

Can by following equation illustrate deducted keep redistributing of pulse:

$N{B}_3\left(\mathrm{SFn}\right)={\mathrm{NB}}_2\left(\mathrm{SFn}\right)+{\mathrm{NB}}_2\left(\mathrm{SFn}\right)\×\frac{\mathrm{CorrSum}}{\underset{n=0}{\overset{n=10}{\mathrm{\Σ}}}{\mathrm{NB}}_2\left(\mathrm{SFn}\right)}$

Wherein, NB ₃(SFn) number of keeping pulse of keeping the son field SFn after the redistributing of pulse for being deducted.

Circuit is realized

Figure 17 illustrates the possible circuit of previously described method and realizes.To import picture data RGB and be forwarded to gamma piece 10, wherein, apply following operation:

$D_{\mathrm{out}}=65535\×{\left(\frac{D_{\mathrm{in}}}{1023}\right)}^{\mathrm{\γ}}$

Wherein, D _INBe the input data,

D _OUTBe output data, and,

γ＝2.2。

In our example, the input data comprise 10, and output data has 16.As previously mentioned, by average power determination block 12 output data is sued for peace, so that average power level APL to be provided.

By the power management LUT 20 that receives the APL value is the first number N B that each son SFn determines to keep pulse ₁(SFn), be approximately equal to predetermined target value so that be used in the required average power of the PDP of display frame.

Handle concurrently from the output data of removing gamma piece 10 by jitter block 11, to turn back to 8 bit resolutions.By encoding block 13 will be sub-field data by the digital coding of jitter block 11 outputs.Subsequently, sub-field data is stored in the frame memory 14.Calculate the quantity of the active pixel load (SFn) that is used for each son SFn by a load piece 21.

Based on Load (SFn) and NB ₁(SFn), proofread and correct LUT 22 for the number N B that keeps pulse ₁(SFn) the regulation corrected value Corr (SFn, Load (SFn)) that will be deducted.Use another piece 23 to realize following operation: NB ₁(SFn)-Corr (SFn, Load (SFn)).The new number of keeping pulse of a son SFn is called as NB ₂(SFn).

Subsequently, use piece 24, so as with the number N B that keeps pulse of all sons ₂(SFn) pro rata, redistribute in all sons deducted keep pulse, and realize following operation:

${\mathrm{NB}}_3\left(\mathrm{SFn}\right)=({\mathrm{NB}}_2\left(\mathrm{SFn}\right)\·[1+\frac{\mathrm{CorrSum}}{\mathrm{\Σ}{\mathrm{NB}}_2\left(\mathrm{SFn}\right)}\left]\right)$

The number of pulse is kept in calculating, and uses it to control PDP to show and to be stored in the frame memory 14 and by the sub-field data of serial conversion.

Load effect of the present invention compensation notion is based on the LUT 22 with two inputs, described two inputs promptly: keep the number and a son load of pulse.It provides and should be reduced to certain number of keeping pulse to obtain the quantity of keeping pulse of the brightness identical with full load field.Illustrate such LUT by Figure 18.

Formerly in the example of Miao Shuing, the number of keeping pulse proceeds to 339 from 1.This table comprises 339 laterally inputs.In order to realize being used for 6 precision of load effect, should represent a son load by 6.This table comprises 64 vertical inputs.The maximum correction that should be applied in and the value 339 that should be adjusted to 33.71% decay interrelate (should deduct in the case, 114 and keep pulse).This means: proofreading and correct needs 7 precision.In this case, overall storage demand will be about 339 * 64 * 7=148 kilobits.

Each number of keeping pulse (1 to 339) that comprises for current son field and for each load (step-length by 1.5% is measured) of this son, LUT 22 provides the definite quantity of keeping pulse that should deduct from the initial number of keeping pulse.

The utilization of this table need be calculating its overall load (number of the light-emitting component of activation is divided by the total quantity of light-emitting component) of each son.To this, a load son piece 21 comprises 11 counters (preferably, design 16 counters and cover 16 sub-field modes of as many as), and counter is used for every of sub-field data, and, each based on the V synchronizing pulse and in every frame is reset described counter.Subsequently, for each pixel, suitable subfield counter is increased progressively the corresponding position of sub-field data.Each counter is increased progressively the value (if should not be activated for the current video value child field, then being 0, if should be activated the child field, then is 1) of the position of sub-field data.If handle three kinds of colors (handling a kind of color simultaneously by same scrambler) serially, then 11 counters are enough.Otherwise, if with three LUT mutually concurrently to three kinds of color codings, then we will have 33 counters.The size of counter depends on the maximum quantity of the light-emitting component of being analyzed: the WXGA panel comprises 1365 * 768 * 3=3144960 light-emitting component, this means 22 digit counters (2 ²²=4194304).Because it is enough being used for 7 precision of son load calculation, so, the output of counter is limited to 7.

In order to improve the work of circuit, can on the output valve of a load piece 21, add hysteresis function (hysteresis function), so that avoid any and beat (jitter) or vibrate.This kind with the filtering of the value of a son load is corresponding.

Because this solution is based on LUT and irrelevant fully with employed sub-field structure, so, the hardware realization simplified to a great extent.

Claims (30)

1, a kind of method, it is used for handling in the image duration that comprises a plurality of sons field will be in the data with picture displayed on the display panel of lasting light-emitting component, wherein each son field comprises: address phase, during it, activate or do not activate the light-emitting component of panel according to picture data; And the maintenance stage, during it, light the light-emitting component of activation by keeping pulse, it is characterized in that this method may further comprise the steps:

-be the quantity of the light-emitting component of the activation in the every line of each son light-emitting component of calculating display panel, it is called as linear load,

-be that the maximum of linear load of each son two continuous lines calculating display panel is poor, and

-poor according to the maximum load of each son field, and be that frequency is kept in the selection of each son, so that reduce line load effect.

2, the method for claim 1 is characterized in that, only carries out the calculating of maximum load difference greater than the line of minimum load for its load.

3, method as claimed in claim 2 is characterized in that, the minimum load of line equal the light-emitting component in the line of display panel quantity 10%.

4, as a described method in the claim 1 to 3, it is characterized in that, on a plurality of frames (T-1) before present frame and the described present frame, the maximum load of calculating for each son between two continuous lines of display panel is poor, and the maximum load difference that is used to select to keep frequency is the mean value of the maximum load difference calculated for described a plurality of frames.

5, as a described method in the claim 1 to 4, it is characterized in that, so that show the number of light-emitting component of current picture and the selected frequency of keeping that is used for described son, and adjust number of keeping pulse of each son according to being activated.

6, method as claimed in claim 5, it is characterized in that, for according to being activated in case show current picture light-emitting component number and be used for described son selectedly keep number of keeping pulse that frequency is adjusted each son, this method may further comprise the steps:

-measure representative will be activated so that show first average power level (APL (t)) of number of the light-emitting component of current picture,

-for each son calculates and selected frequency and the standard kept kept the corresponding adjustment coefficient of ratio (Adj (n)) between the frequency,

The total quantity of keeping pulse (Sum (t)) in-calculating frame, described total quantity and the quantum of keeping pulse with corresponding, relevant and the amassing of each quantum of keeping pulse and son for the adjustment coefficient of the maximum quantity of keeping pulse that is used for described son and described son field

-calculate described in the representative frame to keep second average power level of the total quantity (Sum (t)) of pulse (APL ' (t)), and

-according to the maximal value of described first and second average power level (APL (t), APL ' are (t)), and be number that each son selects to keep pulse.

7, as a described method in the claim 1 to 6, it is characterized in that this method is further comprising the steps of:

-picture data is encoded to sub-field data,

-calculate based on described sub-field data each the son load, and

-adjust the number of keeping pulse of son field based on sub load, so that between the weight of brightness that produces by the lasting light-emitting component that is used for the son field and son field, have identical proportional relation.

8, method as claimed in claim 7 is characterized in that, in order to adjust the number of keeping pulse of son field, this method may further comprise the steps:

-be provided for the first number (NB that keeps pulse of described son ₁),

-based on the load of described son with keep first number of pulse, and stipulate the corrected value that will be deducted for described first number of keeping pulse;

-from described first number of keeping pulse, deduct described corrected value, so that have the second number (NB that keeps pulse that is used for described son ₂).

9, method as claimed in claim 8 is characterized in that, utilizes as the load of the described son of input signal and keeps the number of pulse, advises the corrected value of stator field by look-up table.

10, method as claimed in claim 9 is characterized in that, realizes being stored in corrected value in the look-up table by following steps:

-for 1 and the first number M that keeps pulse of the son of highest weighting between all first numbers of keeping pulse and a plurality of non-0 load that comprise, measure the brightness that a plurality of light-emitting components by display module produce,

-in each and the described load in described first number of keeping pulse each, determine with in the similar number of keeping pulse and the described load the highest one and measure with reference to brightness brightness decay Comparatively speaking, and

-in each and the described load in described first number of keeping pulse each, by determined brightness decay and described first number of keeping pulse are multiplied each other, and calculated correction value.

11, method as claimed in claim 9 is characterized in that, realizes being stored in corrected value in the look-up table by following steps:

-for specific first number of keeping pulse and a plurality of non-0 load, measure brightness by a plurality of light-emitting components generations of display module,

-in the described load each, determine with in the described load the highest one and measure with reference to brightness brightness decay Comparatively speaking, and

-for each and described specific first number of keeping pulse in the described load, by determined brightness decay and described specific first number of keeping pulse are multiplied each other, and calculated correction value.

12, method as claimed in claim 11 is characterized in that, specific first number of keeping pulse is greater than 20.

13, as a described method in the claim 8 to 12, it is characterized in that, readjust second number of keeping pulse of a plurality of son, so as with second number of keeping pulse of each son pro rata, in each son, redistribute the quantity of keeping pulse that is deducted.

14, as a described method in the claim 7 to 13, it is characterized in that, based on each the son load and adjust each the son number of keeping pulse before, readjust the described number of keeping pulse, be approximately equal to fixing desired value so that be used for the required average power level of the display module of display frame.

As a described method in the claim 7 to 14, it is characterized in that 15, the calculating of the load of son field comprises: to counting at the light-emitting component that described sub-field period is lighted.

16, a kind of device, it is used for handling in the image duration that comprises a plurality of sons field will be in the data with picture displayed on the display panel of lasting light-emitting component, wherein each son field comprises: address phase, during it, activate or do not activate the light-emitting component of panel according to picture data; And the maintenance stage, during it, light the light-emitting component of activation by keeping pulse, it is characterized in that this device comprises:

-be used to each son calculate the activation in the every line of light-emitting component of the display panel be called as linear load light-emitting component quantity and be used to each son to calculate the assembly (15) of maximum difference of linear load of two continuous lines of display panel, and

-be used for being each sub to select to keep frequency so that reduce the assembly (17) of line load effect according to each maximum load difference of sub.

17, device as claimed in claim 16 is characterized in that, only carries out the calculating of maximum load difference greater than the line of minimum load for its load.

18, device as claimed in claim 17 is characterized in that, the minimum load of line equal the light-emitting component in the line of display panel quantity 10%.

19, as a described device in the claim 16 to 18, it is characterized in that, this device also comprises termporal filter (16), it is used for a plurality of frames (T-1) before present frame and described present frame, mean value for the maximum load difference between each son two continuous lines of calculating, and, by selecting assembly (17) to use described mean value, so that select to keep frequency.

20, as a described device in the claim 16 to 19, it is characterized in that, so that show the number of light-emitting component of current picture and the selected frequency of keeping that is used for described son, and adjust number of keeping pulse of each son according to being activated.

21, device as claimed in claim 20 is characterized in that, this device comprises:

-computation module (12) is used to calculate representative and is used for according to reference to keeping first average power level (APL (t)) that frequency shows the power that the display panel of current picture is required,

-the first look-up table (18), it is poor to be used for according to the maximum of the linear load of correspondence, and adjust coefficient (Adj (n)) for each son field provides, described adjustment coefficient (Adj (n)) with selected be used for described son field to keep the ratio that frequency and standard keep between the frequency corresponding

-multiplier (19) is used to each son and described adjustment coefficient and the maximum quantity of keeping pulse is multiplied each other, and for each son field provides the adjusted maximum quantity of keeping pulse,

-totalizer (20) is used for the adjusted maximum quantity summation of keeping pulse to all son fields of frame,

-second look-up table (21), be used for the described adjusted maximum quantity of keeping pulse and be converted to second average power level (APL ' (t))

-be used between first and second average power level (APL (t), APL ' are (t)), selecting maximum level (APL " (t)) assembly (22), and

-Di three look-up tables (23) are used for described maximum level (APL " (t)) is converted to the quantity of keeping pulse that is used for each son.

22, device as claimed in claim 16 is characterized in that, this device also comprises:

-be used for picture data is encoded to the assembly (13) of sub-field data,

-be used for calculating the assembly (21) of the load of each son based on described sub-field data, and

-be used for adjusting the number of keeping pulse of son so that the assembly (22,23) that between the weight of the brightness that produces by the lasting light-emitting component that is used for son and son, has identical proportional relation based on the load of son.

23, device as claimed in claim 22 is characterized in that, the assembly that is used to adjust the number of keeping pulse of son comprises:

-be used to be provided for the first number (NB that keeps pulse of described son ₁) assembly (12,13),

-proofread and correct assembly (22), be used for based on the load of described son and keep first number of pulse and the corrected value stipulating for described first number of keeping pulse to be deducted; And

-be used for deducting described corrected value so that have the second number (NB that keeps pulse that is used for described son field from described first number of keeping pulse ₂) assembly (23).

24, device as claimed in claim 23 is characterized in that, proofreaies and correct assembly for utilizing as the load of the described son of input signal and keeping the look-up table (22) of the number of pulse.

25, device as claimed in claim 24 is characterized in that, realizes being stored in corrected value in the look-up table (22) by following steps:

-for 1 and the first number M that keeps pulse of the son of highest weighting between all first numbers of keeping pulse and a plurality of non-0 load that comprise, measure the brightness that a plurality of light-emitting components by display module produce,

-in each and the described load in described first number of keeping pulse each, determine with in the similar number of keeping pulse and the described load the highest one and measure with reference to brightness brightness decay Comparatively speaking, and

-in each and the described load in described first number of keeping pulse each, by determined brightness decay and described first number of keeping pulse are multiplied each other, and calculated correction value.

26, device as claimed in claim 24 is characterized in that, realizes being stored in corrected value in the look-up table (22) by following steps:

-for specific first number of keeping pulse and a plurality of non-0 load, measure brightness by a plurality of light-emitting components generations of display module,

-in the described load each, determine with in the described load the highest one measure with reference to brightness brightness decay Comparatively speaking, and

-for each and described specific first number of keeping pulse in the described load, by determined brightness decay and described specific first number of keeping pulse are multiplied each other, and calculated correction value.

27, device as claimed in claim 26 is characterized in that, specific first number of keeping pulse is greater than 20.

28, as a described device in the claim 23 to 27, it is characterized in that this device comprises: be used for readjusting second number of keeping pulse of a plurality of sons so that redistribute the assembly (24) of the quantity of keeping pulse that is deducted pro rata in each son field with second number of keeping pulse of each son.

29, as a described device in the claim 22 to 28, it is characterized in that this device comprises: be used for adjust number of keeping pulse of each son based on load of each son before, readjusting and describedly keep the number of pulse so that be used for the assembly (12,13) that the required average power level of the display module of display frame is approximately equal to fixing desired value.

30, a kind of Plasmia indicating panel, it comprises a plurality of lasting light-emitting component of arranging in the mode of row and column, it is characterized in that, this plasma display panel comprises: according to one in the claim 16 to the 29 described device that is used for the compensating load effect.

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