Patent ID: 8004545

Claim:
A display apparatus comprising a panel including pixels, each of which has RGBW (Red, Green, Blue and White) wavelength distribution characteristics, ranged two-dimensionally and a backlight, comprising: a brightness sensor for detecting brightness of an external environment; a W generation circuit for outputting an RGWB signal using an inputted RGB signal; a correcting circuit for outputting an adjusted RGBW signal in which a W signal is adjusted in the RGBW signal in accordance with an output signal of said brightness sensor; a backlight modulating circuit for outputting a signal for driving said panel and for driving said backlight in accordance with said adjusted RGBW signal; wherein a maximum value of luminance of said adjusted RGBW signal is detected when the quantity of light of said backlight is fixed as a maximum, and wherein quantity of light of said backlight is decreased using the maximum value of quantity of light of said backlight as a reference, in accordance with a maximum value of luminance of said adjusted RGBW signal, and transmittance of said panel is increased using transmittance of said panel when quantity of light of said backlight is fixed to a maximum as a reference.