CN100559440C - Reduce the driving method of plane display power consumption - Google Patents

Abstract

The present invention proposes a kind of method that reduces plane display power consumption, and this method comprises following step at least: at first judge the RGB gray-scale value of pixel, and convert thereof into X, Y, Z tristimulus values, then this X, Y, Z tristimulus values are converted into L ^*Value, a ^*Value and b ^*Value, and in can accepting the value of chromatism scope, decision L ^*' value, a ^*' value and b ^*' value, wherein this L ^*' value, a ^*' value and b ^*' value and this L ^*Value, this a ^*Value and this b ^*Aberration between value is to drop on this can accept to change this L at last in the value of chromatism scope ^*' value, a ^*' value and b ^*' value is X ', Y ', Z ' tristimulus values, and converts thereof into R ' G ' B ' gray-scale value.The present invention can be lowered the power that blue light consumes effectively, increases the life-span of blue light, and effectively reduces the consumed power of monoblock panel, promotes the whole life-span.

Description

Reduce the driving method of plane display power consumption

Technical field

The present invention is relevant for a kind of method of operating, particularly relevant for a kind of method of operating of Organic Light Emitting Diode.

Background technology

Organic Light Emitting Diode (organic light-emitting diode, OLED) basic structure is the indium tin oxide (ITO) that has characteristic of semiconductor by thin and transparent, link to each other with the positive pole of power supply, add another metallic cathode, be bundled into structure as sandwich.The total layer comprises: hole transmission layer (HTL), luminescent layer (EL) and electron transfer layer (ETL).When power supply was supplied to appropriate voltage, anodal hole will combine in luminescent layer with cathode electronics and produce light, formed the different red, green and blue three primary colors that produce according to it, constituted basic color.The characteristic of OLED is own luminous, so visibility and brightness are all high, supremacy clause such as add that reaction is fast, in light weight, thin thickness, simple structure and cost are low, and it has become follow-on flat-panel screens.

Yet the life problems of luminescent material has often limited the range of application of OLED, and especially the life-span of therefore how effectively to improve OLED promptly becomes the target of pursuit far below ruddiness and green light material its life-span on blue light material.

Summary of the invention

Therefore, purpose of the present invention promptly addresses the above problem.By adjusting the color gray-scale value in the aberration scope that does not go out in the human eye identification, save the power that red, green, blue consumes, and then promote the life-span of OLED.

For achieving the above object, the present invention proposes a kind of method that reduces power consumption, and this method comprises following step at least: at first judge the RGB gray-scale value of pixel, and convert thereof into X, Y, Z tristimulus values, then this X, Y, Z tristimulus values are converted into L ^*Value, a ^*Value and b ^*Value, and in the value of chromatism the accepted scope of setting, determine L ^*' value, a ^*' value and b ^*' value, wherein this L ^*' value, a ^*' value and b ^*' value and this L ^*Value, this a ^*Value and this b ^*Aberration between value is to drop on this can accept to change this L at last in the value of chromatism scope ^*' value, a ^*' value and b ^*' value is X ', Y ', Z ' tristimulus values, and converts thereof into R ' G ' B ' gray-scale value.

In an embodiment, said method also comprises calculating with respect to using this RGB gray-scale value when this pixel, use this R ' G ' B ' gray-scale value can save consumed power in this pixel, and in this can accept the value of chromatism scope, repeat above-mentioned steps and obtain the R ' G ' B ' gray-scale value that maximum can be saved consumed power, at last R ' G ' B ' the gray-scale value that can save consumed power with this maximum drives this pixel.

Aforesaid method wherein uses the CIE1976LAB system that this X, Y, Z tristimulus values are converted to L ^*Value, a ^*Value and b ^*Value.

Aforesaid method, wherein this L ^*Value and L ^*' value representation psychology lightness, this a ^*Value, this b ^*Value, this a ^*' value and b ^*' value is for psychometric chroma.

Aforesaid method, wherein this L ^*' value, a ^*' value and b ^*' value and this L ^*Value, this a ^*Value and this b ^*Aberration between value is [(Δ L ^*) ²+ (Δ a ^*) ²+ (Δ b ^*) ²] ^1/2, Δ L wherein ^*=L ^*'-L ^*, Δ a ^*=a ^*'-a ^*And Δ b ^*=b ^*'-b ^*

Aforesaid method, wherein this can to accept the value of chromatism scope be 3 to 6.

Aforesaid method wherein determines L ^*' value, a ^*' value and b ^*' step of value also comprises: reduce L ^*Value is to obtain L ^*' value; Rising b ^*Value is to obtain b ^*' value; And reduction a ^*Value is to obtain a ^*' value.

Aforesaid method, wherein X represents red primaries, and Y represents green primary color, and Z represents blue primary.In sum, use method of the present invention, can lower the power that blue light consumes effectively, increase the life-span of blue light, and effectively reduce the consumed power of monoblock panel, promote the whole life-span.

Description of drawings

Fig. 1 shows according to embodiments of the invention in order to adjust the process flow diagram of color gray-scale value.

Figure 2 shows that according to the preferred embodiment of the present invention and adjust L ^*' value, a ^*' value, b ^*' value process flow diagram.

Wherein, description of reference numerals is as follows:

101～107 and 201～203: step

Embodiment

The present invention saves the power that red, green, blue consumes by adjusting the color gray-scale value in the aberration scope that does not go out in the human eye identification, and then promotes the life-span of OLED.

Consult and Figure 1 shows that according to the preferred embodiment of the present invention in order to adjust the process flow diagram of color gray-scale value.Can judge the gray-scale value of RGB in the step 101 earlier.Then with mathematical method the grayvalue transition of former red green blue (RGB) is become X, Y, Z tristimulus values in step 102, wherein X represents red primaries, and Y represents green primary color, and Z represents blue primary, these three primary colors are not true looks physically, but the imaginary look of fabricating.Become X, Y, the employed transition matrix of Z tristimulus values as follows the grayvalue transition of RGB:

$r=\left\{\begin{array}{cc}R/12.92& R\≤0.04045\\ {((R+0.055)/1.055)}^{2.4}& R>0.04045\end{array}\right.$

$g=\left\{\begin{array}{cc}G/12.92& G\≤0.04045\\ {((G+0.055)/1.055)}^{2.4}& G>0.04045\end{array}\right.$

$b=\left\{\begin{array}{cc}B/12.92& B\≤0.04045\\ {((B+0.055)/1.055)}^{2.4}& B>0.04045\end{array}\right.$

[XYZ]＝[rgb][M]

Then in step 103, in order further to improve and the method for unified color evaluation, by color space and the relevant colour difference formula thereof that CIE recommended in 1976, i.e. CIE1976LAB (or L ^*a ^*b ^*System), X, Y, Z tristimulus values are changed.Its conversion formula is:

$\left\{\begin{array}{c}{L}^{*}=116{(Y/Y_0)}^{1/3}-16\\ a^{*}=500[{(X/X_0)}^{1/3}-{(Y/Y_0)}^{1/3}]\\ b^{*}=200[{(Y/Y_0)}^{1/3}-{(Z/Z_0)}^{1/3}],Y/Y_0>0.01\end{array}\right.$

Wherein X, Y, Z are the tristimulus values of object; X ₀, Y ₀, Z ₀Tristimulus values for the CIE standard illuminants; L ^*Represent psychological lightness; a ^*, b ^*Be psychometric chroma, wherein a ^*Be red green axle, b ^*Be the champac axle.Wherein ,+a ^*The expression deflection is red ,-a ^*The expression deflection is green ,+ ^*B represents that deflection is yellow ,-b ^*The expression deflection is blue, and the lightness of color is by L ^*Percentage is represented.

Then in step 104 and 105, flow process of the present invention can be finely tuned former L ^*, a ^*, b ^*Become L ^*', a ^*', b ^*', and calculate L ^*', a ^*', b ^*' and former L ^*, a ^*, b ^*Aberration between the two is to find out the L of consumes least power in meeting the aberration scope that the human eye identification do not go out ^*', a ^*', b ^*' be worth, and be worth the former L of replacement with this ^*, a ^*, b ^*Wherein aberration is meant that two kinds of colors of method representation of using numerical value are to the difference on people's color perception.If two tinctorial pattern samples are all pressed L ^*, a ^*, b ^*Demarcate color, then total color difference Δ E between the two ^*Ab and every individual event aberration can calculate with following formula:

Luminosity equation: Δ L ^*=L ^*'-L ^*

Colour difference: Δ a ^*=a ^*'-a ^*, Δ b ^*=b ^*'-b ^*

Total color difference: Δ E ^*Ab=[(Δ L ^*) ²+ (Δ a ^*) ²+ (Δ b ^*) ²] ^1/2

Δ E ^*What person ab can standard goes out is patient scope in people's perception.Different Δ E ^*Color effect in the ab scope is different, wherein:

Δ E ^*Ab=1.6～3.2, human eye are can not differentiate difference in color basically.

Δ E ^*Ab=3.2～6.5, the printing master worker of professional training can distinguish its difference, majority feel that still color is identical.

Δ E ^*Ab=6.5～13, the color difference can be differentiated, but tone itself is still identical.

Δ E ^*Ab=13～25 can be confirmed to be different tone performances, can pick out the subordinate of color also.

Δ E ^*Ab surpasses more than 25, and then representative is another kind of different color.

Set acceptable setting range according to the present invention and need meet the aberration that the human eye identification does not go out to adjust front and back, so its L that searches ^*', a ^*', b ^*' and former L ^*, a ^*, b ^*Between aberration scope (Δ E ^*Ab) be to drop between 3 to 6.

Owing to adjust L separately ^*Value, a ^*Value, b ^*Value, or adjust wantonly two values, or all adjustment of three values, visually all have different aberration influences.Therefore method of adjustment according to the preferred embodiment of the invention and since human eye for light and shade feel stronger, therefore to lightness (L ^*) adjust, adopt ± 0.5, ± 1 the rest may be inferred.And to chroma (a ^*, b ^*) adjustment, adopt ± 1, ± 2 the rest may be inferred.With under the preceding topic that meets the aberration that the human eye identification do not go out, find out the L that saves peak power ^*' value, a ^*' value, b ^*' value.

Then utilize mathematical method with L in step 106 ^*' value, a ^*' value, b ^*' value converts X ', Y ', Z ' tristimulus values to.And convert X ', Y ', Z ' tristimulus values to R ' G ' B ' gray-scale value with mathematical method, and replace former RGB gray-scale value with this R ' G ' B ' gray-scale value in step 107.Calculate the power that this R ' G ' B ' gray-scale value is consumed in step 108 at last, and compare the power number percent of being saved with the power that former RGB gray-scale value is consumed.According to this, compare, save the maximum R ' G ' B ' gray-scale value of power number percent to hunt out.

Be to adjust not influencing under the preceding topic of vision to heterochromia according to the present invention, the therefore shown image that goes out does not sensuously not only have any difference human eye, more can effectively reduce the consumed power of monoblock panel, promotes the whole life-span.

In a preferred embodiment because in the OLED luminescent material, with single pixel, when same bright 255 gray scales, with the wasted work rate (0.00816mW) of blue light, ruddiness take second place (0.00456mW), green glow minimum (0.00276mW), therefore when adjusting Lab, meeting is to reduce the blue light gray scale for preferentially considering.

Consult and Figure 2 shows that and adjust process flow diagram according to the preferred embodiment of the invention.At first, set Δ E in step 201 ^*Ab is less than 4, that is L ^*Value, a ^*Value, b ^*Being worth acceptable setting range is aberration variation (the Δ E of front and back ^*Ab) less than 4.Then reduce L in step 202 ^*Value is because L ^*Value is represented light and shade, the easiest sensation of discovering of human eye just, and have only L ^*Value reduces could reduce whole consumed power.In step 203, adjust b at last ^*Value, purpose therefore will be with b for reducing the consumption of blue light ^*Value raises.Adjust a at last ^*Value is similarly under the considering of overall power, with a ^*Value reduces can effectively reduce whole consumed power.

In sum, the life-span of OLED blue light material is minimum at present, ruddiness takes second place, green glow is the highest, adopting said method, not only can effectively reduce the power that blue light consumes, increasing the life-span of blue light, and effectively reduce the consumed power of monoblock panel, promote the whole life-span.

Though the present invention with preferred embodiment openly as above; right its is not in order to limit the present invention; those skilled in the art without departing from the spirit and scope of the present invention, when can doing a little change and modification, so protection scope of the present invention is as the criterion when looking the scope that appending claims defines.

Claims (8)

1. method that reduces power consumption, this method comprises following step at least:

Judge the RGB gray-scale value of pixel;

Change this RGB gray-scale value and become X, Y, Z tristimulus values;

Change this X, Y, the Z tristimulus values is L ^*Value, a ^*Value and b ^*Value;

Setting can be accepted value of chromatism;

Determine L ^*' value, a ^*' value and b ^*' value, wherein this L ^*' value, a ^*' value, b ^*' value and this L ^*Value, this a ^*Value, this b ^*Aberration between value is to drop on this can accept in the value of chromatism scope;

Change this L ^*' value, a ^*' value and b ^*' value is X ', Y ', Z ' tristimulus values; And

Change this X ', Y ', Z ' tristimulus values is a R ' G ' B ' gray-scale value.

2. the method for claim 1 also comprises:

Calculating uses this R ' G ' B ' gray-scale value can save consumed power in this pixel with respect to using this RGB gray-scale value when this pixel;

In this can accept the value of chromatism scope, repeat the step of claim 1, can save the R ' G ' B ' gray-scale value of consumed power to obtain maximum; And

R ' G ' B ' the gray-scale value that can save consumed power with this maximum drives this pixel.

3. the method for claim 1 wherein uses the CIE1976LAB system that this X, Y, Z tristimulus values are converted to L ^*Value, a ^*Value and b ^*Value.

4. the method for claim 1, wherein this L ^*Value and L ^*' value representation psychology lightness, this a ^*Value, this b ^*Value, this a ^*' value and b ^*' value is for psychometric chroma.

5. the method for claim 1, wherein this L ^*' value, a ^*' value and b ^*' value and this L ^*Value, this a ^*Value and this b ^*Aberration between value is [(Δ L ^*) ²+ (Δ a ^*) ²+ (Δ b ^*) ²] ^1/2, Δ L wherein ^*=L ^*'-L ^*, Δ a ^*=a ^*'-a ^*And Δ b ^*=b ^*'-b ^*

6. the method for claim 1, wherein this can to accept the value of chromatism scope be 3 to 6.

7. the method for claim 1 wherein determines L ^*' value, a ^*' value and b ^*' step of value also comprises:

Reduce L ^*Value is to obtain L ^*' value;

Rising b ^*Value is to obtain b ^*' value; And

Reduce a ^*Value is to obtain a ^*' value.

8. the method for claim 1, wherein X represents red primaries, and Y represents green primary color, and Z represents blue primary.

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