Method for regulating color shift in white balance procedure of four-color display device
View Patent ↗Disclosed is a method for regulating color shift in white balance procedure of a four-color display device. The method includes steps of: obtaining brightness of a white color displayed by a combination according to stimulus values Y of a red sub pixel unit, a green sub pixel unit, a blue pixel unit, and a fourth sub pixel unit; and balancing a white color and one shifting color/two shifting colors/three shifting colors using a weighting factor in case of a two-color balance, a three-color balance, or a four-color balance.
1. A method for regulating color shift in a white balance procedure of a four-color display device, comprising steps of:
S 10 : obtaining brightness of a white color displayed by a combination according to stimulus values Y of a red sub pixel unit, a green sub pixel unit, a blue pixel unit, and a fourth sub pixel unit, which equals to brightness of a corresponding standard white gamma curve in gray-scale values from 0 to 255; and
S 20 : balancing a white color and one shifting color, or the white color and two shifting colors, or the white color and three shifting colors using a weighting factor in case of a two-color balance, a three-color balance, or a four-color balances;
wherein the two-color balance refers to matching the white color, and meanwhile balancing a color shift of violet, or meanwhile balancing a color shift of orange, or meanwhile balancing a color shift of yellow, or meanwhile balancing a color shift of cyan.
2. The method for regulating the color shift in the white balance procedure of the four-color display device according to claim 1 , wherein in step S 10 , a gray-scale value of each sub pixel unit is regulated according to a following expression:
L v ( W i )= Y ( R o )+ Y ( G o )+ Y ( B o )+ Y ( M o ),
wherein Lv (Wi) represents brightness of a white color with a gray-scale value being i; Ro, Go, Bo, and Mo represent output four color gray-scale values; and Y(R o ), Y(G o ), Y(B o ), and Y(M o ) respectively represent stimulus values of each sub pixel unit.
3. The method for regulating the color shift in the white balance procedure of the four-color display device according to claim 1 , wherein in step S 20 , in situation of the two-color balance, weighting factors are assigned according to following ways, so that the color shift in the white balance procedure of the four-color display device is regulated:
dividing gray-scale values from 0 to 255 into two sections: 0 to n and n+1 to 255, two weighting factors a and b corresponding to the section o to n, another two weighting factors c and d corresponding to the section n+1 to 255;
assuming target chromaticities of the white color as x 1 and y 1 , and target chromaticities of a shifting color as x 2 and y 2 ;
thus, a×x 1 +b×x 2 =(X(R o )+X(G o )+X(B o )+X(M o ))/S,
a×y 1 +b×y 2 =(Y(R o )+Y(G o )+Y(B o )+Y(M o ))/S, when 0≤input gray-scale value≤n; and
c×x 1 +d×x 2 =(X(R o )+X(G o )+X(B o )+X(M o ))/S,
c×y 1 +d×y 2 =(Y(R o )+Y(G o )+Y(B o )+Y(M o ))/S, when n+1≤input gray-scale value≤255,
wherein a+b=1, c+d=1, and R o , G o , B o , and M o represent output four color gray-scale values; and
{
M
o
=
f
(
R
o
,
G
o
,
B
o
)
L
v
(
W
i
)
/
L
v
(
W
255
)
=
(
i
/
255
)
2.2
S
=
X
(
R
o
)
+
Y
(
R
o
)
+
Z
(
R
o
)
+
X
(
G
o
)
+
Y
(
G
o
)
+
Z
(
G
o
)
+
X
(
B
o
)
+
Y
(
B
o
)
+
Z
(
B
o
)
+
X
(
M
o
)
+
Y
(
M
o
)
+
Z
(
M
o
)
wherein X(·),Y(·), and Z(·) respectively represent X, Y, and Z stimulus values of each sub pixel unit, and f represents a mapping relationship from the gray-scale values of the red sub pixel unit, the green sub pixel unit, and the blue sub pixel unit to the gray-scale value of the fourth sub pixel unit which is in accordance with the three-color to four-color calculation algorithm.
4. The method for regulating the color shift in the white balance procedure of the four-color display device according to claim 3 , wherein the two-color balance refers to matching the white color, and meanwhile balancing a color shift of violet, or meanwhile balancing a color shift of orange, or meanwhile balancing a color shift of yellow, or meanwhile balancing a color shift of cyan.
5. The method for regulating color shift in white balance procedure of the four-color display device according to claim 3 , wherein n is less than a gray-scale value corresponding to an inflexion of a chromaticity curve after white balance in a four-color pixel system.
6. The method for regulating the color shift in the white balance procedure of the four-color display device according to claim 1 , wherein in step S 20 , in situation of the three-color balance, weighting factors are assigned according to following ways, so that color shift in white balance procedure of the four-color display device is regulated:
dividing gray-scale values from 0 to 255 into two sections: 0 to n and n+1 to 255, three weighting factors e, f, and g corresponding to the section o to n, another three weighting factors h, i, and j corresponding to the section n+1 to 255;
assuming target chromaticities of the white color as x 1 and y 1 , and target chromaticities of two shifting colors as x 2 , y 2 and x 3 , y 3 ;
thus, e×x 1 +f×x 2 +g×x 3 =(X(R o )+X(G o )+X(B o )+X(M o ))/S,
e×y 1 +f×y 2 +g×y 3 =(Y(R o )+Y(G o )+Y(B o )+Y(M o ))/S, when 0≤input gray-scale value≤n; and
h×x 1 +i×x 2 +j×x 3 =(X(R o )+X(G o )+X(B o )+X(M o ))/S,
h×y 1 +i×y 2 +j×y 3 =(Y(R o )+Y(G o )+Y(B o )+Y(M o ))/S, when n+1≤input gray-scale value≤255,
wherein e+f+g=1, h+i+j=1, and R o , G o , B o , and M o represent output four color gray-scale values;
and
{
M
o
=
f
(
R
o
,
G
o
,
B
o
)
L
v
(
W
i
)
/
L
v
(
W
255
)
=
(
i
/
255
)
2.2
S
=
X
(
R
o
)
+
Y
(
R
o
)
+
Z
(
R
o
)
+
X
(
G
o
)
+
Y
(
G
o
)
+
Z
(
G
o
)
+
X
(
B
o
)
+
Y
(
B
o
)
+
Z
(
B
o
)
+
X
(
M
o
)
+
Y
(
M
o
)
+
Z
(
M
o
)
wherein X(·),Y(·), and Z(·) respectively represent X, Y, and Z stimulus values of each sub pixel unit, and f represents a mapping relationship from the gray-scale values of the red sub pixel unit, the green sub pixel unit, and the blue sub pixel unit to the gray-scale value of the fourth sub pixel unit which is in accordance with the three-color to four-color calculation algorithm.
7. The method for regulating the color shift in the white balance procedure of the four-color display device according to claim 6 , wherein the three-color balance refers to matching the white color, and meanwhile balancing color shifts of violet and orange, or meanwhile balancing color shifts of violet and yellow, or meanwhile balancing color shifts of violet and cyan, or meanwhile balancing color shifts of orange and yellow, or meanwhile balancing color shifts of orange and cyan, or meanwhile balancing color shifts of yellow and cyan.
8. The method for regulating the color shift in the white balance procedure of the four-color display device according to claim 6 , wherein n is less than a gray-scale value corresponding to an inflexion of a chromaticity curve after white balance in a four-color pixel system.
9. The method for regulating the color shift in the white balance procedure of the four-color display device according to claim 1 , wherein the three-color balance refers to matching the white color, and meanwhile balancing color shifts of violet and orange, or meanwhile balancing color shifts of violet and yellow, or meanwhile balancing color shifts of violet and cyan, or meanwhile balancing color shifts of orange and yellow, or meanwhile balancing color shifts of orange and cyan, or meanwhile balancing color shifts of yellow and cyan.
10. The method for regulating the color shift in the white balance procedure of the four-color display device according to claim 1 , wherein in step S 20 , in situation of the four-color balance, weighting factors are assigned according to following ways, so that color shift in white balance procedure of the four-color display device is regulated:
dividing gray-scale values from 0 to 255 into two sections: 0 to n and n+1 to 255, four weighting factors k, l, m, and n corresponding to the section o to n, another four weighting factors o, p, q, and r corresponding to the section n+1 to 255;
assuming target chromaticities of the white color as x 1 and y 1 , and target chromaticities of three shifting colors as (x 2 , y 2 ), (x 3 , y 3 ), and x 4 , y 4 ;
thus, k×x 1 +l×x 2 +m×x 3 +n×x 4 =(X(R o )+X(G o )+X(B o )+X(M o ))/S,
k×y+l×y 2 +m×y 3 +n×y 4 =(Y(R o )+Y(G o )+Y(B o )+Y(M o ))/S, when 0≤input gray-scale value≤n; and
o×x 1 +p×x 2 +q×x 3 +r×x 4 =(X(R o )+X(G o )+X(B o )+X(M o )/S,
o×y 1 +p×y 2 +q×y 3 +r×y 4 =(Y(R o )+Y(G o )+Y(B o )+Y(M o ))S, when n+1≤input gray-scale value≤255,
wherein k+l+m+n=1, o+p+q+r=1, and R o , G o , B o , and M o represent output four color gray-scale values;
and
{
M
o
=
f
(
R
o
,
G
o
,
B
o
)
L
v
(
W
i
)
/
L
v
(
W
255
)
=
(
i
/
255
)
2.2
S
=
X
(
R
o
)
+
Y
(
R
o
)
+
Z
(
R
o
)
+
X
(
G
o
)
+
Y
(
G
o
)
+
Z
(
G
o
)
+
X
(
B
o
)
+
Y
(
B
o
)
+
Z
(
B
o
)
+
X
(
M
o
)
+
Y
(
M
o
)
+
Z
(
M
o
)
wherein X(·),Y(·), and Z(·) respectively represent X, Y, and Z stimulus values of each sub pixel unit, and f represents a mapping relationship from the gray-scale values of the red sub pixel unit, the green sub pixel unit, and the blue sub pixel unit to the gray-scale value of the fourth sub pixel unit which is in accordance with the three-color to four-color calculation algorithm.
11. The method for regulating the color shift in the white balance procedure of the four-color display device according to claim 10 , wherein the four-color balance refers to matching the white color, and meanwhile balancing color shifts of violet, orange, and yellow, or meanwhile balancing color shifts of violet, orange, and cyan, or meanwhile balancing color shifts of violet, yellow and cyan, or meanwhile balancing color shifts of orange, yellow, and cyan.
12. The method for regulating color shift in white balance procedure of the four-color display device according to claim 10 , wherein n is less than a gray-scale value corresponding to an inflexion of a chromaticity curve after white balance in a four-color pixel system.
13. The method for regulating the color shift in the white balance procedure of the four-color display device according to claim 1 , wherein the four-color balance refers to matching the white color, and meanwhile balancing color shifts of violet, orange, and yellow, or meanwhile balancing color shifts of violet, orange, and cyan, or meanwhile balancing color shifts of violet, yellow and cyan, or meanwhile balancing color shifts of orange, yellow, and cyan.
14. A method for regulating color shift in a white balance procedure of a four-color display device, comprising steps of:
S 10 : obtaining brightness of a white color displayed by a combination according to stimulus values Y of a red sub pixel unit, a green sub pixel unit, a blue pixel unit, and a fourth sub pixel unit, which equals to brightness of a corresponding standard white gamma curve in gray-scale values from 0 to 255; and
S 20 : balancing a white color and one shifting color, or the white color and two shifting colors, or the white color and three shifting colors using a weighting factor in case of a two-color balance, a three-color balance, or a four-color balance;
wherein the three-color balance refers to matching the white color, and meanwhile balancing color shifts of violet and orange, or meanwhile balancing color shifts of violet and yellow, or meanwhile balancing color shifts of violet and cyan, or meanwhile balancing color shifts of orange and yellow, or meanwhile balancing color shifts of orange and cyan, or meanwhile balancing color shifts of yellow and cyan.
15. The method for regulating the color shift in the white balance procedure of the four-color display device according to claim 14 , wherein in step S 20 , in situation of the two-color balance, weighting factors are assigned according to following ways, so that the color shift in the white balance procedure of the four-color display device is regulated:
dividing gray-scale values from 0 to 255 into two sections: 0 to n and n+1 to 255, two weighting factors a and b corresponding to the section o to n, another two weighting factors c and d corresponding to the section n+1 to 255;
assuming target chromaticities of the white color as x i and y i , and target chromaticities of a shifting color as x 2 and y 2 ;
thus, a×x 1 +b×x 2 =(X(R o )+X(G o )+X(B o )+X(M o ))/S,
a×y 1 +b×y 2 =(Y(R o )+Y(G o )+Y(B o )+Y(M o ))/S, when 0≤input gray-scale value≤n; and
c×x 1 +d×x 2 (X(R o )+X(G o )+X(B o )+X(M o ))/S,
c×y 1 +d×y 2 =(Y(R o )+Y(G o )+Y(B o )+Y(M o ))/S, when n+1≤input gray-scale value≤255,
wherein a+b=1, c+d=1, and R o , G o , B o , and M o represent output four color gray-scale values; and
{
M
o
=
f
(
R
o
,
G
o
,
B
o
)
L
v
(
W
i
)
/
L
v
(
W
255
)
=
(
i
/
255
)
2.2
S
=
X
(
R
o
)
+
Y
(
R
o
)
+
Z
(
R
o
)
+
X
(
G
o
)
+
Y
(
G
o
)
+
Z
(
G
o
)
+
X
(
B
o
)
+
Y
(
B
o
)
+
Z
(
B
o
)
+
X
(
M
o
)
+
Y
(
M
o
)
+
Z
(
M
o
)
wherein X(·),Y(·), and Z(·) respectively represent X, Y, and Z stimulus values of each sub pixel unit, and f represents a mapping relationship from the gray-scale values of the red sub pixel unit, the green sub pixel unit, and the blue sub pixel unit to the gray-scale value of the fourth sub pixel unit which is in accordance with the three-color to four-color calculation algorithm.
16. The method for regulating the color shift in the white balance procedure of the four-color display device according to claim 14 , wherein in step S 20 , in situation of the three-color balance, weighting factors are assigned according to following ways, so that color shift in white balance procedure of the four-color display device is regulated:
dividing gray-scale values from 0 to 255 into two sections: 0 to n and n+1 to 255, three weighting factors e, f, and g corresponding to the section o to n, another three weighting factors h, i, and j corresponding to the section n+1 to 255;
assuming target chromaticities of the white color as x 1 and y 1 , and target chromaticities of two shifting colors as x 2 , y 2 and x 3 , y 3 ;
thus, e×x 1 +f×x 2 +g×x 3 =(X(R o )+X(G o )+X(B o )+X(M o ))/S,
e×y 1 +f×y 2 +g×y 3 =(Y(R o )+Y(G o )+Y(B o )+Y(M o ))/S, when 0≤input gray-scale value≤n; and
h×x 1 +i×x 2 +j×x 3 =(X(R o )+X(G o )+X(B o )+X(M o ))/S,
h×y 1 +i×y 2 +j×y 3 =(Y(R o )+Y(G o )+Y(B o )+Y(M o ))/S, when n+1l input gray-scale value≤255,
wherein e+f+g=1, h+i+j=1, and R o , G o , B o , and M o represent output four color gray-scale values;
and
{
M
o
=
f
(
R
o
,
G
o
,
B
o
)
L
v
(
W
i
)
/
L
v
(
W
255
)
=
(
i
/
255
)
2.2
S
=
X
(
R
o
)
+
Y
(
R
o
)
+
Z
(
R
o
)
+
X
(
G
o
)
+
Y
(
G
o
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+
Z
(
G
o
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+
X
(
B
o
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+
Y
(
B
o
)
+
Z
(
B
o
)
+
X
(
M
o
)
+
Y
(
M
o
)
+
Z
(
M
o
)
wherein X(·),Y(·), and Z(·) respectively represent X, Y, and Z stimulus values of each sub pixel unit, and f represents a mapping relationship from the gray-scale values of the red sub pixel unit, the green sub pixel unit, and the blue sub pixel unit to the gray-scale value of the fourth sub pixel unit which is in accordance with the three-color to four-color calculation algorithm.
17. The method for regulating the color shift in the white balance procedure of the four-color display device according to claim 14 , wherein in step S 20 , in situation of the four-color balance, weighting factors are assigned according to following ways, so that color shift in white balance procedure of the four-color display device is regulated:
dividing gray-scale values from 0 to 255 into two sections: 0 to n and n+1 to 255, four weighting factors k, l, m, and n corresponding to the section o to n, another four weighting factors o, p, q, and r corresponding to the section n+1 to 255;
assuming target chromaticities of the white color as x 1 and y 1 , and target chromaticities of three shifting colors as (x 2 , y 2 ), (x 3 , y 3 ), and x 4 , y 4 ;
thus, k×+l×x 2 +m×x 3 +n×x 4 =(X(R o )+X(G o )+X(B o )+X(M o ))/S,
k×y 1 +l×y 2 +m×y 3 +n×y 4 =(Y(R o )+Y(G o )+Y(B o )+Y(M o )S, when 0≤input gray-scale value≤n; and
o×x 1 +p×x 2 +q×x 3 +r×x 4 =(X(R o )+X(G o )+X(B o )+X(M o )/S,
o×y+p×y 2 +q×y 3 +r×y 4 =(Y(R o )+Y(G o )+Y(B o )+Y(M o ))S, when n+1≤input gray-scale value≤255,
wherein k+l+m+n=1, o+p+q+r=1, and R o , G o , B o , and M o represent output four color gray-scale values;
and
{
M
o
=
f
(
R
o
,
G
o
,
B
o
)
L
v
(
W
i
)
/
L
v
(
W
255
)
=
(
i
/
255
)
2.2
S
=
X
(
R
o
)
+
Y
(
R
o
)
+
Z
(
R
o
)
+
X
(
G
o
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+
Y
(
G
o
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+
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+
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B
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+
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B
o
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+
Z
(
B
o
)
+
X
(
M
o
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+
Y
(
M
o
)
+
Z
(
M
o
)
wherein X(·),Y(·), and Z(·) respectively represent X, Y, and Z stimulus values of each sub pixel unit, and f represents a mapping relationship from the gray-scale values of the red sub pixel unit, the green sub pixel unit, and the blue sub pixel unit to the gray-scale value of the fourth sub pixel unit which is in accordance with the three-color to four-color calculation algorithm.
18. A method for regulating color shift in a white balance procedure of a four-color display device, comprising steps of:
S 10 : obtaining brightness of a white color displayed by a combination according to stimulus values Y of a red sub pixel unit, a green sub pixel unit, a blue pixel unit, and a fourth sub pixel unit, which equals to brightness of a corresponding standard white gamma curve in gray-scale values from 0 to 255; and
S 20 : balancing a white color and one shifting color, or the white color and two shifting colors, or the white color and three shifting colors using a weighting factor in case of a two-color balance, a three-color balance, or a four-color balance;
wherein the four-color balance refers to matching the white color, and meanwhile balancing color shifts of violet, orange, and yellow, or meanwhile balancing color shifts of violet, orange, and cyan, or meanwhile balancing color shifts of violet, yellow and cyan, or meanwhile balancing color shifts of orange, yellow, and cyan.
19. The method for regulating the color shift in the white balance procedure of the four-color display device according to claim 18 , wherein in step S 20 , in situation of the two-color balance, weighting factors are assigned according to following ways, so that the color shift in the white balance procedure of the four-color display device is regulated:
dividing gray-scale values from 0 to 255 into two sections: 0 to n and n+1 to 255, two weighting factors a and b corresponding to the section o to n, another two weighting factors c and d corresponding to the section n+1 to 255;
assuming target chromaticities of the white color as x 1 and y 1 , and target chromaticities of a shifting color as x 2 and y 2 ;
thus, a x 1 +b×x 2 =(X(R o )+X(G o )+X(B o )+X(M o ))/S,
a×y 1 +b×y 2 =(Y(R o )+Y(G o )+Y(B o )+Y(M o ))/S, when 0≤input gray-scale value≤n; and
c×x 1 +d×x 2 =(X(R o )+X(G o )++X(M o ))/S,
c×y 1 +d×y 2 =(Y(R o )+Y(G o )+Y(B o )+Y(M o ))/S, when n+1≤input gray-scale value≤255,
wherein a+b=1, c+d=1, and R o , G o , B o , and M o represent output four color gray-scale values; and
{
M
o
=
f
(
R
o
,
G
o
,
B
o
)
L
v
(
W
i
)
/
L
v
(
W
255
)
=
(
i
/
255
)
2.2
S
=
X
(
R
o
)
+
Y
(
R
o
)
+
Z
(
R
o
)
+
X
(
G
o
)
+
Y
(
G
o
)
+
Z
(
G
o
)
+
X
(
B
o
)
+
Y
(
B
o
)
+
Z
(
B
o
)
+
X
(
M
o
)
+
Y
(
M
o
)
+
Z
(
M
o
)
wherein X(·),Y(·), and Z(·) respectively represent X, Y, and Z stimulus values of each sub pixel unit, and f represents a mapping relationship from the gray-scale values of the red sub pixel unit, the green sub pixel unit, and the blue sub pixel unit to the gray-scale value of the fourth sub pixel unit which is in accordance with the three-color to four-color calculation algorithm.
20. The method for regulating the color shift in the white balance procedure of the four-color display device according to claim 18 , wherein in step S 20 , in situation of the three-color balance, weighting factors are assigned according to following ways, so that color shift in white balance procedure of the four-color display device is regulated:
dividing gray-scale values from 0 to 255 into two sections: 0 to n and n+1 to 255, three weighting factors e, f, and g corresponding to the section o to n, another three weighting factors h, i, and j corresponding to the section n+1 to 255;
assuming target chromaticities of the white color as x 1 and y 1 , and target chromaticities of two shifting colors as x 2 , y 2 and x 3 , y 3 ;
thus, e×x 1 +f×x 2 +g×x 3 =(X(R o )+X(G o )+X(B o )+X(M o ))/S,
e×y 1 +f×y 2 +g×y 3 =(Y(R o )+Y(G o )+Y(B o )+Y(M o ))/S, when 0≤input gray-scale value≤n; and
h×x 1 +i×x 2 +j×x 3 =(X(R o )+X(G o )+X(B o )+X(M o ))/S,
h×y 1 +i×y 2 +j×y 3 =(Y(R o )+Y(G o )+Y(B o )+Y(M o ))/S, when n+1l input gray-scale value≤255,
wherein e+f+g=1, h+i+j=1, and R o , G o , B o , and M o represent output four color gray-scale values;
and
{
M
o
=
f
(
R
o
,
G
o
,
B
o
)
L
v
(
W
i
)
/
L
v
(
W
255
)
=
(
i
/
255
)
2.2
S
=
X
(
R
o
)
+
Y
(
R
o
)
+
Z
(
R
o
)
+
X
(
G
o
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+
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+
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+
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+
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+
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o
)
wherein X(·),Y(·), and Z(·) respectively represent X, Y, and Z stimulus values of each sub pixel unit, and f represents a mapping relationship from the gray-scale values of the red sub pixel unit, the green sub pixel unit, and the blue sub pixel unit to the gray-scale value of the fourth sub pixel unit which is in accordance with the three-color to four-color calculation algorithm.