CN101877217A - Color correction method for LED liquid crystal display device - Google Patents

Abstract

The invention discloses a color correction method for an LED liquid crystal display device, which comprises the following steps of: (1) measuring a conversion coefficient [1, Rg, Rb] for converting a red color value into PAL-system red, a conversion coefficient [Gr, 1, Gb] for converting a green color value into PAL-system green, and a conversion coefficient [Br, Bg, 1] for converting a blue color value into PAL-system blue of the display device to be corrected; (2) combining the three measured conversion coefficients to form a color conversion matrix; and (3) multiplying the red, green and blue color values of the original display device by the conversion matrix F to obtain the corrected PAL red, green and blue color values. The correction method for correcting the LED liquid display device avoids the effects of over-rich or over-light single color which does not conform to real colors due to the difference of adopted LED primary colors; and the corrected color effect is basically consistent with PAL-system colors of the conventional CRT.

Description

A kind of color correcting method that is used for the LED liquid crystal display

Technical field:

The invention belongs to the LED field of liquid crystal display, relate to a kind of color correcting method of the LED of being used for liquid crystal display.Can avoid because the difference of the LED primary colours that adopt causes solid color overrich or the light excessively effect that does not meet real color in the image by the data of this colour correction output.

Background technology:

Because the advantage of each side, LED-backlit LCD TV dominating the market progressively.But because the difference of the LED that each producer adopted, especially the difference of the centre wavelength of three-primary color LED, can cause display device show monochromatic during as red, green, blue etc. heterochromia very big, do not meet people's visual sense feeling for a long time, sometimes even the color that can seriously be divorced from reality.

Each producer all adopts white balance to handle the colour mixture situation of three primary colours always, but white balance can only be handled the colour mixture situation, can make white reach pure white colour.But white balance can not be handled monochrome, so when different manufacturers adopts different three-color LEDs, show the widely different of monochromatic effect, what have is dark especially, and the color that has is very shallow.

Given this, the present invention proofreaies and correct from basic three primary colours data, avoids the problem of above-mentioned appearance, and it is consistent with the PAL-system color of tradition (c) RT televisor to revise the back color.

Summary of the invention:

The objective of the invention is to overcome the shortcoming of above-mentioned prior art, provide a kind of color correcting method of LED liquid crystal display to avoid because the difference of the LED primary colours that adopt causes solid color overrich or the light excessively result who does not meet real color in the image.

The objective of the invention is to solve by the following technical programs:

A kind of color correcting method that is used for the LED liquid crystal display may further comprise the steps:

(1) the red color value of measuring display device to be corrected is converted to the conversion coefficient [1, Rg, Rb] of PAL-system redness, the conversion coefficient [Gr that the green tint value is converted to the PAL-system green, 1, Gb] and blue color-values be converted to the conversion coefficient [Br, Bg, 1] of PAL-system blueness;

(2) the synthetic following color conversion matrix of three conversion coefficients that record:

$F=\left(\begin{array}{ccc}1& \mathrm{Gr}& \mathrm{Br}\\ \mathrm{Rg}& 1& \mathrm{Bg}\\ \mathrm{Rb}& \mathrm{Gb}& 1\end{array}\right);$

(3) the red, green, blue color-values of former display device and transition matrix F multiply each other and can obtain proofreading and correct PAL red, green, blue color-values afterwards:

$\left(\begin{array}{c}{R}_{\mathrm{PAL}}\\ G_{\mathrm{PAL}}\\ B_{\mathrm{PAL}}\end{array}\right)=F\×\left(\begin{array}{c}R\\ G\\ B\end{array}\right).$

The measuring process of the red conversion coefficient of described step (1) may further comprise the steps:

(a) with colorimeter measure the redness of pal mode chromaticity coordinates (Yr0, Ur0, Vr0) and the chromaticity coordinates of the redness of the LED liquid crystal display that will proofread and correct (Yr, Ur, Vr);

(b) in the redness of LED liquid crystal display, add green composition Rg_add=(Rr1-Rr0) Gr0/Rr0 and blue composition Rb_add=(Rr1-Rr0) Br0/Rr0; Wherein,

Rr1＝1.0069Yr-0.0022Ur+1.1436Vr，

Rr0＝1.0069Yr0-0.0022Ur0+1.1436Vr0，

Gr0＝0.9965Yr0-0.3762Ur0-0.5826Vr0，

Br0＝Yr0+2.024Ur0+0.0059Vr0，

Gr1＝0.9965Yr-0.3762Ur-0.5826Vr，

Br1＝Yr+2.024Ur+0.0059Vr；

(c) remeasure red chromaticity coordinates after the LED liquid crystal display that will proofread and correct adds green and blue composition (Yr, Ur, Vr);

(d), then note the green components in proportions Rg=Rg_add/Gr1 of interpolation this moment and the blue components in proportions Rb=Rb_add/Br1 of interpolation if the red chromaticity coordinates of LED liquid crystal display is consistent with the chromaticity coordinates of the redness of pal mode; If inconsistent, repeating step (b) and (c) then;

(e) red conversion that obtains the LED liquid crystal display is the conversion coefficient [1, Rg, Rb] of the redness of pal mode.

The measuring process of the green conversion coefficient of described step (1) may further comprise the steps:

(a) with colorimeter measure the green of pal mode chromaticity coordinates (Yg0, Ug0, Vg0) and the chromaticity coordinates of the green of the LED liquid crystal display that will proofread and correct (Yg, Ug, Vg);

(b) in the green of LED liquid crystal display, add red composition Gr_add=(Gg1-Gg0) Rg0/Gg0 and blue composition Gb_add=(Gg1-Gg0) Bg0/Gg0; Wherein,

Gg1＝0.9965Yg-0.3762Ug-0.5826Vg，

Gg0＝0.9965Yg0-0.3762Ug0-0.5826Vg0，

Rg1＝1.0069Yg-0.0022Ug+1.1436Vg，

Rg0＝1.0069Yg0-0.0022Ug0+1.1436Vg0，

Bg1＝Yg+2.024Ug+0.0059Vg，

Bg0＝Yg0+2.024Ug0+0.0059Vg0；

(c) remeasure green chromaticity coordinates after the LED liquid crystal display that will proofread and correct adds red and blue composition (Yg, Ug, Vg);

(d), then note red components in proportions Gr=Gr_add/Rg1 that adds this moment and the blue components in proportions Gb=Gb_add/Bg1 that adds if the green chromaticity coordinates of LED liquid crystal display is consistent with the chromaticity coordinates of the green of pal mode; If inconsistent, repeating step (b) and (c) then;

(e) green conversion that obtains the LED liquid crystal display is the conversion coefficient [Gr, 1, Gb] of the green of pal mode.

The measuring process of the blue conversion coefficient of described step (1) may further comprise the steps:

(a) with colorimeter measure the blueness of pal mode chromaticity coordinates (Yb0, Ub0, Vb0) and the chromaticity coordinates of the blueness of the LED liquid crystal display that will proofread and correct (Yb, Ub, Vb);

(b) in the blueness of LED liquid crystal display, add red composition Br_add=(Bb1-Bb0) Rb0/Bb0 and green composition composition Bg_add=(Bb1-Bb0) Gb0/Bb0; Wherein,

Bb1＝Yb+2.024Ub+0.0059Vb，

Bb0＝Yb0+2.024Ub0+0.0059Vb0，

Rb1＝1.0069Yb-0.0022Ub+1.1436Vb，

Rb0＝1.0069Yb0-0.0022Ub0+1.1436Vb0，

Gb1＝0.9965Yb-0.3762Ub-0.5826Vb，

Gb0＝0.9965Yb0-0.3762Ub0-0.5826Vb0；

(c) remeasure blue chromaticity coordinates Yb after the LED liquid crystal display that will proofread and correct adds red and green composition, Ub, Vb);

(d), then note red components in proportions Br=Br_add/Rb1 that adds this moment and the green components in proportions Bg=Bg_add/Gb1 that adds if the blue chromaticity coordinates of LED liquid crystal display is consistent with the chromaticity coordinates of the blueness of pal mode; If inconsistent, repeating step (b) and (c) then;

(e) blueness that obtains the LED liquid crystal display is converted to the conversion coefficient [Br, Bg, 1] of the blueness of pal mode.

Bearing calibration of the present invention is to the correction of LED liquid crystal display, avoid because the difference of the LED primary colours that adopt causes solid color overrich or the light excessively effect that does not meet real color in the image, and the color effect after proofreading and correct is consistent with the PAL-system color of tradition (c) RT substantially.

Description of drawings:

Fig. 1 is a color conversion process flow diagram of the present invention.

Embodiment:

Below in conjunction with accompanying drawing the present invention is done and to describe in further detail:

Referring to Fig. 1, algorithm flow chart of the present invention is finished the conversion of LED liquid crystal display to the PAL-system color as shown in Figure 1.Whole implementing procedure of the present invention is as follows:

(1) with colorimeter measure the redness of pal mode chromaticity coordinates (Yr0, Ur0, Vr0) and the chromaticity coordinates of the redness of the LED liquid crystal display that will proofread and correct (Yr, Ur, Vr);

(2) in the redness of LED liquid crystal display, add green composition Rg_add=(Rr1-Rr0) Gr0/Rr0 and blue composition Rb_add=(Rr1-Rr0) Br0/Rr0; Wherein,

Rr1＝1.0069Yr-0.0022Ur+1.1436Vr，

Rr0＝1.0069Yr0-0.0022Ur0+1.1436Vr0，

Gr0＝0.9965Yr0-0.3762Ur0-0.5826Vr0，

Br0＝Yr0+2.024Ur0+0.0059Vr0，

Gr1＝0.9965Yr-0.3762Ur-0.5826Vr，

Br1＝Yr+2.024Ur+0.0059Vr；

(3) remeasure red chromaticity coordinates after the LED liquid crystal display that will proofread and correct adds green and blue composition (Yr, Ur, Vr);

(4), then note green components in proportions Rg=Rg_add/Gr1 that adds this moment and the blue components in proportions Rb=Rb_add/Br1 that adds if the red chromaticity coordinates of LED liquid crystal display is consistent with the chromaticity coordinates of the redness of pal mode; If inconsistent, then repeating step (2) and (3);

(5) red conversion that obtains the LED liquid crystal display is the conversion coefficient [1, Rg, Rb] of the redness of pal mode;

(6) with colorimeter measure the green of pal mode chromaticity coordinates (Yg0, Ug0, Vg0) and the chromaticity coordinates of the green of the LED liquid crystal display that will proofread and correct (Yg, Ug, Vg);

(7) in the green of LED liquid crystal display, add red composition Gr_add=(Gg1-Gg0) Rg0/Gg0 and blue composition Gb_add=(Gg1-Gg0) Bg0/Gg0; Wherein,

Gg1＝0.9965Yg-0.3762Ug-0.5826Vg，

Gg0＝0.9965Yg0-0.3762Ug0-0.5826Vg0，

Rg1＝1.0069Yg-0.0022Ug+1.1436Vg，

Rg0＝1.0069Yg0-0.0022Ug0+1.1436Vg0，

Bg1＝Yg+2.024Ug+0.0059Vg，

Bg0＝Yg0+2.024Ug0+0.0059Vg0；

(8) remeasure green chromaticity coordinates after the LED liquid crystal display that will proofread and correct adds red and blue composition (Yg, Ug, Vg);

(9), then note red components in proportions Gr=Gr_add/Rg1 that adds this moment and the blue components in proportions Gb=Gb_add/Bg1 that adds if the green chromaticity coordinates of LED liquid crystal display is consistent with the chromaticity coordinates of the green of pal mode; If inconsistent, then repeating step (7) and (8);

(10) green conversion that obtains the LED liquid crystal display is the conversion coefficient [Gr, 1, Gb] of the green of pal mode;

(11) with colorimeter measure the blueness of pal mode chromaticity coordinates (Yb0, Ub0, Vb0) and the chromaticity coordinates of the blueness of the LED liquid crystal display that will proofread and correct (Yb, Ub, Vb);

(12) in the blueness of LED liquid crystal display, add red composition Br_add=(Bb1-Bb0) Rb0/Bb0 and green composition composition Bg_add=(Bb1-Bb0) Gb0/Bb0; Wherein,

Bb1＝Yb+2.024Ub+0.0059Vb，

Bb0＝Yb0+2.024Ub0+0.0059Vb0，

Rb1＝1.0069Yb-0.0022Ub+1.1436Vb，

Rb0＝1.0069Yb0-0.0022Ub0+1.1436Vb0，

Gb1＝0.9965Yb-0.3762Ub-0.5826Vb，

Gb0＝0.9965Yb0-0.3762Ub0-0.5826Vb0；

(13) remeasure blue chromaticity coordinates after the LED liquid crystal display that will proofread and correct adds red and green composition (Yb, Ub, Vb);

(14), then note red components in proportions Br=Br_add/Rb1 that adds this moment and the green components in proportions Bg=Bg_add/Gb1 that adds if the blue chromaticity coordinates of LED liquid crystal display is consistent with the chromaticity coordinates of the blueness of pal mode; If inconsistent, then repeating step (12) and (13);

(15) blueness that obtains the LED liquid crystal display is converted to the conversion coefficient [Br, Bg, 1] of the blueness of pal mode;

(16) the synthetic following color conversion matrix F of three conversion coefficients that record:

$F=\left(\begin{array}{ccc}1& \mathrm{Gr}& \mathrm{Br}\\ \mathrm{Rg}& 1& \mathrm{Bg}\\ \mathrm{Rb}& \mathrm{Gb}& 1\end{array}\right)$

(17) the red, green, blue color-values of former display device and transition matrix F multiply each other and can obtain proofreading and correct PAL red, green, blue color-values afterwards:

$\left(\begin{array}{c}{R}_{\mathrm{PAL}}\\ G_{\mathrm{PAL}}\\ B_{\mathrm{PAL}}\end{array}\right)=F\×\left(\begin{array}{c}R\\ G\\ B\end{array}\right).$

Above content is to further describing that the present invention did in conjunction with concrete preferred implementation; can not assert that the specific embodiment of the present invention only limits to this; for the general technical staff of the technical field of the invention; without departing from the inventive concept of the premise; can also make some simple deduction or replace, all should be considered as belonging to the present invention and determine scope of patent protection by claims of being submitted to.

Claims (4)

1. a color correcting method that is used for the LED liquid crystal display is characterized in that, may further comprise the steps:

(1) the red color value of measuring display device to be corrected is converted to the conversion coefficient [1, Rg, Rb] of PAL-system redness, the conversion coefficient [Gr that the green tint value is converted to the PAL-system green, 1, Gb] and blue color-values be converted to the conversion coefficient [Br, Bg, 1] of PAL-system blueness;

(2) the synthetic following color conversion matrix of three conversion coefficients that record:

$F=\left(\begin{array}{ccc}1& \mathrm{Gr}& \mathrm{Br}\\ \mathrm{Rg}& 1& \mathrm{Bg}\\ \mathrm{Rb}& \mathrm{Gb}& 1\end{array}\right);$

(3) the red, green, blue color-values of former display device and transition matrix F multiply each other and can obtain proofreading and correct PAL red, green, blue color-values afterwards:

$\left(\begin{array}{c}{R}_{\mathrm{PAL}}\\ G_{\mathrm{PAL}}\\ B_{\mathrm{PAL}}\end{array}\right)=F\×\left(\begin{array}{c}R\\ G\\ B\end{array}\right).$

2. a kind of according to claim 1 color correcting method that is used for the LED liquid crystal display is characterized in that, the measuring process of the red conversion coefficient of described step (1) may further comprise the steps:

(a) with colorimeter measure the redness of pal mode chromaticity coordinates (Yr0, Ur0, Vr0) and the chromaticity coordinates of the redness of the LED liquid crystal display that will proofread and correct (Yr, Ur, Vr);

(b) in the redness of LED liquid crystal display, add green composition Rg_add=(Rr1-Rr0) Gr0/Rr0 and blue composition Rb_add=(Rr1-Rr0) Br0/Rr0; Wherein,

Rr1＝1.0069Yr-0.0022Ur+1.1436Vr，

Rr0＝1.0069Yr0-0.0022Ur0+1.1436Vr0，

Gr0＝0.9965Yr0-0.3762Ur0-0.5826Vr0，

Br0＝Yr0+2.024Ur0+0.0059Vr0，

Gr1＝0.9965Yr-0.3762Ur-0.5826Vr，

Br1＝Yr+2.024Ur+0.0059Vr；

(c) remeasure red chromaticity coordinates after the LED liquid crystal display that will proofread and correct adds green and blue composition (Yr, Ur, Vr);

(d), then note the green components in proportions Rg=Rg_add/Gr1 of interpolation this moment and the blue components in proportions Rb=Rb_add/Br1 of interpolation if the red chromaticity coordinates of LED liquid crystal display is consistent with the chromaticity coordinates of the redness of pal mode; If inconsistent, repeating step (b) and (c) then;

(e) red conversion that obtains the LED liquid crystal display is the conversion coefficient [1, Rg, Rb] of the redness of pal mode.

3. a kind of according to claim 1 color correcting method that is used for the LED liquid crystal display is characterized in that, the measuring process of the green conversion coefficient of described step (1) may further comprise the steps:

(a) with colorimeter measure the green of pal mode chromaticity coordinates (Yg0, Ug0, Vg0) and the chromaticity coordinates of the green of the LED liquid crystal display that will proofread and correct (Yg, Ug, Vg);

(b) in the green of LED liquid crystal display, add red composition Gr_add=(Gg1-Gg0) Rg0/Gg0 and blue composition Gb_add=(Gg1-Gg0) Bg0/Gg0; Wherein,

Gg1＝0.9965Yg-0.3762Ug-0.5826Vg，

Gg0＝0.9965Yg0-0.3762Ug0-0.5826Vg0，

Rg1＝1.0069Yg-0.0022Ug+1.1436Vg，

Rg0＝1.0069Yg0-0.0022Ug0+1.1436Vg0，

Bg1＝Yg+2.024Ug+0.0059Vg，

Bg0＝Yg0+2.024Ug0+0.0059Vg0；

(c) remeasure green chromaticity coordinates after the LED liquid crystal display that will proofread and correct adds red and blue composition (Yg, Ug, Vg);

(d), then note red components in proportions Gr=Gr_add/Rg1 that adds this moment and the blue components in proportions Gb=Gb_add/Bg1 that adds if the green chromaticity coordinates of LED liquid crystal display is consistent with the chromaticity coordinates of the green of pal mode; If inconsistent, repeating step (b) and (c) then;

(e) green conversion that obtains the LED liquid crystal display is the conversion coefficient [Gr, 1, Gb] of the green of pal mode.

4. a kind of according to claim 1 color correcting method that is used for the LED liquid crystal display is characterized in that, the measuring process of the blue conversion coefficient of described step (1) may further comprise the steps:

(a) with colorimeter measure the blueness of pal mode chromaticity coordinates (Yb0, Ub0, Vb0) and the chromaticity coordinates of the blueness of the LED liquid crystal display that will proofread and correct (Yb, Ub, Vb);

(b) in the blueness of LED liquid crystal display, add red composition Br_add=(Bb1-Bb0) Rb0/Bb0 and green composition composition Bg_add=(Bb1-Bb0) Gb0/Bb0; Wherein,

Bb1＝Yb+2.024Ub+0.0059Vb，

Bb0＝Yb0+2.024Ub0+0.0059Vb0，

Rb1＝1.0069Yb-0.0022Ub+1.1436Vb，

Rb0＝1.0069Yb0-0.0022Ub0+1.1436Vb0，

Gb1＝0.9965Yb-0.3762Ub-0.5826Vb，

Gb0＝0.9965Yb0-0.3762Ub0-0.5826Vb0；

(c) remeasure blue chromaticity coordinates after the LED liquid crystal display that will proofread and correct adds red and green composition (Yb, Ub, Vb);

(d), then note red components in proportions Br=Br_add/Rb1 that adds this moment and the green components in proportions Bg=Bg_add/Gb1 that adds if the blue chromaticity coordinates of LED liquid crystal display is consistent with the chromaticity coordinates of the blueness of pal mode; If inconsistent, repeating step (b) and (c) then;

(e) blueness that obtains the LED liquid crystal display is converted to the conversion coefficient [Br, Bg, 1] of the blueness of pal mode.

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