Image display device
First Claim
1. A gamut adjusting method of a gamut adjusting circuit, the method, comprising:
- calculating, by a saturation calculating circuit of the gamut adjusting circuit, a saturation of an input image signal;
setting, by a matrix generating circuit of the gamut adjusting circuit, a translation matrix for translating the input image signal;
executing, a matrix calculating circuit of the gamut adjusting circuit, a matrix calculation for the input image signal based on the translation matrix; and
generating, by data translation circuit of the gamut adjusting circuit, an output image signal for output on a display based on the matrix calculation, wherein setting the translation matrix includes;
setting, by a matrix calculating circuit of the gamut adjusting circuit, a unit matrix as the translation matrix when a value of the saturation below a threshold value,rotating, by a matrix calculating circuit of the gamut adjusting circuit, the saturation in proportion to an increase in the saturation when the saturation value is greater than the threshold value and smaller than a maximum value of saturation, andswitching, by a matrix calculating circuit of the gamut adjusting circuit, the translation matrix to correspond to or approximate a maximum saturation expressed on a display gamut, wherein a tone on the display corresponds to or approximates a tone of the input image signal when a value of the saturation is smaller than the threshold value.
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Accused Products
Abstract
A gamut adjusting method fully expresses a dynamic range of a display gamut to display an image more naturally. With respect to a brightness signal of each primary color of an input image signal, a data translation unit executes a matrix calculation based on a translation matrix for conversion into an image signal for display control. A saturation calculating unit calculates saturation of the input image signal. When saturation is smaller than a threshold value, the data translation unit is set with a translation matrix such that a tone on the display corresponds to or approximates a tone of the input image signal. When saturation is greater than the threshold value and smaller than a maximum value, as the saturation increases, a translation matrix is switched such that a vector on a xy chromaticity diagram toward a tone on a display approximates a vector toward a tone for maximum saturation.
3 Citations
20 Claims
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1. A gamut adjusting method of a gamut adjusting circuit, the method, comprising:
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calculating, by a saturation calculating circuit of the gamut adjusting circuit, a saturation of an input image signal; setting, by a matrix generating circuit of the gamut adjusting circuit, a translation matrix for translating the input image signal; executing, a matrix calculating circuit of the gamut adjusting circuit, a matrix calculation for the input image signal based on the translation matrix; and generating, by data translation circuit of the gamut adjusting circuit, an output image signal for output on a display based on the matrix calculation, wherein setting the translation matrix includes; setting, by a matrix calculating circuit of the gamut adjusting circuit, a unit matrix as the translation matrix when a value of the saturation below a threshold value, rotating, by a matrix calculating circuit of the gamut adjusting circuit, the saturation in proportion to an increase in the saturation when the saturation value is greater than the threshold value and smaller than a maximum value of saturation, and switching, by a matrix calculating circuit of the gamut adjusting circuit, the translation matrix to correspond to or approximate a maximum saturation expressed on a display gamut, wherein a tone on the display corresponds to or approximates a tone of the input image signal when a value of the saturation is smaller than the threshold value. - View Dependent Claims (2, 3, 4, 5)
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6. An image display device, comprising:
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a saturation calculating circuit to calculate a saturation of an input image signal; a matrix generating circuit to set a translation matrix for translating the input image signal; and a matrix calculating circuit to execute a matrix calculation for the input image signal based on the translation matrix set by the matrix generating circuit and to output an output image signal based on the matrix calculation to a display panel, wherein the matrix generating circuit is to; set a unit matrix as the translation matrix when a value of the saturation is below a threshold value, rotate the saturation in proportion to an increase in the saturation when the saturation value is greater than the threshold value and smaller than a maximum value of saturation, and switch the translation matrix to correspond to or approximate a maximum saturation expressed on a display gamut for maximum saturation, wherein a tone on the display corresponds to or approximates a tone of the input image signal when a value of the saturation is smaller than the threshold value. - View Dependent Claims (7, 8, 9, 10, 11, 12)
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13. A gamut adjusting circuit, comprising:
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a saturation calculator to calculate a saturation of an input image signal; a matrix generator to set a translation matrix for translating the input image signal; and a data translator to execute a matrix calculation for the input image signal based on the translation matrix set by the matrix generator and to output an output image signal based on the matrix calculation to a display panel, wherein the matrix generator is to; set a unit matrix as the translation matrix when a value of the saturation is a maximum value, rotate the saturation in proportion to an increase in the saturation when the saturation value is greater than a threshold value and smaller than a maximum value of saturation, and switch the translation matrix to correspond to or approximate a maximum saturation expressed on a display gamut for maximum saturation, wherein a tone on the display corresponds to or approximates a tone of the input image signal when a value of the saturation is smaller than the threshold value.
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14. A gamut adjusting method of a gamut adjusting circuit, the method, comprising:
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calculating, by a saturation calculating circuit of the gamut adjusting circuit, saturation of an input image signal; executing, a matrix calculating circuit of the gamut adjusting circuit, a matrix calculation based on a translation matrix to convert an input image signal into an image signal for display; and generating, by data translation circuit of the gamut adjusting circuit, an output image signal for output on a display based on the matrix calculation, the matrix calculation including; setting, by a matrix calculating circuit of the gamut adjusting circuit, a translation matrix such that a tone on a display corresponds to or approximates a tone of the input image signal, when a value of the saturation is smaller than a threshold value, and switching, by a matrix calculating circuit of the gamut adjusting circuit, the translation matrix when a value of the saturation is greater than the threshold value and smaller than a maximum value of saturation, the translation matrix switched as the saturation increases such that a vector on a xy chromaticity diagram toward a tone on a display approximates to a vector toward a tone for maximum saturation. - View Dependent Claims (15, 16, 17, 18, 19, 20)
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Specification