Method of dimming backlight assembly
First Claim
1. A method of dimming a backlight assembly of a display panel comprising a plurality of light sources divided into at least one dimming area, the method comprising:
- providing image signals to the display panel;
extracting a plurality of gray-scale values from image signals corresponding to the dimming area to calculate a location parameter value of the gray-scale values;
calculating a kurtosis and a skewness using the location parameter value to output the kurtosis and the skewness as a first calculated value;
calculating at least one of a variance, a standard deviation, a central moment, and an image moment using the location parameter value to output at least one of the variance, the standard deviation, the central moment, and the image moment as a second calculated value;
calculating a maximum value of the gray-scale values;
determining a representative gray-scale value corresponding to the dimming area using the first and the second calculated values;
determining a dimming function for the light sources included in the dimming area based on the representative gray-scale value; and
driving the light sources included in the dimming area based on the dimming function,wherein the representative gray-scale value GRE is represented by the following formula;
γ
2≧
0,GRE=α
×
m+(1−
α
)×
P,
γ
2<
0,GRE=α
×
m+(1−
α
)×
P−
β
γ
1,whereinm denotes the location parameter value, P denotes the maximum value,γ
1 denotes the kurtosis, γ
2 denotes the skewness,
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Abstract
A plurality of gray-scale values is extracted from image signals corresponding to a dimming area to calculate a mean value of the gray-scale values, and at least one of a variance, a standard deviation, a kurtosis, a skewness, a central moment, and an image moment is calculated using the mean value. Then, a representative gray-scale value corresponding to the dimming area is determined using the calculated values, and a dimming function for the light sources included in the dimming area is determined based on the representative gray-scale value. Then, the light sources included in the dimming area are driven based on the dimming function.
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Citations
17 Claims
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1. A method of dimming a backlight assembly of a display panel comprising a plurality of light sources divided into at least one dimming area, the method comprising:
-
providing image signals to the display panel; extracting a plurality of gray-scale values from image signals corresponding to the dimming area to calculate a location parameter value of the gray-scale values; calculating a kurtosis and a skewness using the location parameter value to output the kurtosis and the skewness as a first calculated value; calculating at least one of a variance, a standard deviation, a central moment, and an image moment using the location parameter value to output at least one of the variance, the standard deviation, the central moment, and the image moment as a second calculated value; calculating a maximum value of the gray-scale values; determining a representative gray-scale value corresponding to the dimming area using the first and the second calculated values; determining a dimming function for the light sources included in the dimming area based on the representative gray-scale value; and driving the light sources included in the dimming area based on the dimming function, wherein the representative gray-scale value GRE is represented by the following formula;
γ
2≧
0,GRE=α
×
m+(1−
α
)×
P,
γ
2<
0,GRE=α
×
m+(1−
α
)×
P−
β
γ
1,wherein m denotes the location parameter value, P denotes the maximum value, γ
1 denotes the kurtosis, γ
2 denotes the skewness, - View Dependent Claims (2, 3, 4)
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5. A method of dimming a backlight assembly of a display panel comprising a plurality of light sources divided into at least one dimming area, the method comprising:
-
providing image signals to the display panel; extracting a plurality of gray-scale values from image signals corresponding to the dimming area to calculate a location parameter value of the gray-scale values; calculating a kurtosis and a skewness using the location parameter value to output the kurtosis and the skewness as a first calculated value; calculating at least one of a variance, a standard deviation, a central moment, and an image moment using the location parameter value to output at least one of the variance, the standard deviation, the central moment, and the image moment as a second calculated value; determining a representative gray-scale value corresponding to the dimming area using the first and the second calculated values; determining a dimming function for the light sources included in the dimming area based on the representative gray-scale value; and driving the light sources included in the dimming area based on the dimming function, wherein the representative gray-scale value GRE is represented by the following formula; - View Dependent Claims (6, 7, 8, 9)
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10. A method of dimming a backlight assembly of a display panel comprising a plurality of light sources divided into at least one dimming area, the method comprising:
-
providing image signals to the display panel; extracting a plurality of gray-scale values from image signals corresponding to the dimming area to calculate a location parameter value of the gray-scale values; calculating a kurtosis and a skewness using the location parameter value to output the kurtosis and the skewness as a first calculated value; calculating at least one of a variance, a standard deviation, a central moment, and an image moment using the location parameter value to output at least one of the variance, the standard deviation, the central moment, and the image moment as a second calculated value; calculating a maximum value of the gray-scale values; determining a representative gray-scale value corresponding to the dimming area using the first and the second calculated values; determining a dimming function for the light sources included in the dimming area based on the representative gray-scale value; and driving the light sources included in the dimming area based on the dimming function, wherein the representative gray-scale value GRE is represented by the following formula; - View Dependent Claims (11, 12, 13)
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14. A method of dimming a backlight assembly of a display panel comprising a plurality of light sources divided into at least one dimming area, the method comprising:
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providing image signals to the display panel; extracting a plurality of gray-scale values from image signals corresponding to the dimming area to calculate a location parameter value of the gray-scale values; calculating a kurtosis and a skewness using the location parameter value to output the kurtosis and the skewness as a first calculated value; calculating at least one of a variance, a standard deviation, a central moment, and an image moment using the location parameter value to output at least one of the variance, the standard deviation, the central moment, and the image moment as a second calculated value; calculating a maximum value of the gray-scale values; determining a representative gray-scale value corresponding to the dimming area using the first and the second calculated values; determining a dimming function for the light sources included in the dimming area based on the representative gray-scale value; and driving the light sources included in the dimming area based on the dimming function, wherein the representative gray-scale value GRE is represented by the following formula;
A≦
T1,GRE=m,
A≧
T2,GRE=P,wherein when A is greater than T1 and less than T2 (T1<
A<
T2),the representative gray-scale value satisfies GRE=α
×
m+(1−
α
)×
P when the kurtosis γ
1 is greater than zero (γ
1>
0),the representative gray-scale value satisfies GRE=(1−
β
)×
m+β
×
P when the kurtosis γ
1 is equal to or smaller than zero (γ
1≦
0),wherein
A=|x |+|y |+√
{square root over (|μ
ij|)},x denotes an x-axis average raw image moment of the gray-scale values,y denotes a y-axis average raw image moment of the gray-scale values,μ
ij denotes a central image moment of an i-th degree along the x-axis and of a j-th degree along the y-axis,m denotes the location parameter value, P denotes the maximum value, γ
1 denotes the kurtosis, γ
2 denotes the skewness,T1 and T2 are predetermined threshold values, α
=Kγ
1γ
2, β
=−
Kγ
1γ
2, andK denotes a predetermined constant. - View Dependent Claims (15, 16, 17)
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Specification