Patent ID: 8493514

Claim:
An apparatus for controlling color temperature comprising: a color region determiner determining whether values of luminance signal and chroma signals belong to a predetermined achromatic color region or a chromatic color region; and a color temperature corrector correcting a color temperature by controlling gains of the luminance signal and chroma signals as a result of the determination by the color region determiner, wherein the values of achromatic color region set up by the color region determiner are such that the value of the luminance signal (Y) satisfies the condition of 0≦Y≦Ya (where, Ya is a predetermined experimental value), the chroma signals (U, V) satisfy all the conditions of −Ua≦U≦Ua and −Va≦V≦Va (where, Ua and Va are predetermined experimental values) on a UV plane, where the achromatic color region on a quadrant of the UV plane is a region that satisfies the conditions of U≧V−Ua (where, −Ua≦U≦0 and, 0≦V≦Va).