US 9,812,085 B2  
Image display device  
Kazuhiro Matsumoto, Yokohama (JP)  
Assigned to Samsung Display Co., Ltd., Yongin, Gyeonggido (KR)  
Filed by SAMSUNG DISPLAY CO., LTD., Yongin, GyeonggiDo (KR)  
Filed on May 19, 2014, as Appl. No. 14/281,102.  
Claims priority of application No. 2013106554 (JP), filed on May 20, 2013.  
Prior Publication US 2014/0340418 A1, Nov. 20, 2014  
Int. Cl. G09G 5/04 (2006.01); G09G 5/02 (2006.01); H04N 9/67 (2006.01); H04N 1/60 (2006.01) 
CPC G09G 5/02 (2013.01) [H04N 1/6061 (2013.01); H04N 9/67 (2013.01); G09G 2340/06 (2013.01)]  20 Claims 
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, 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.
