Patent ID: 8872743

Claim:
A liquid crystal display device that performs display by input thereto of image signals for three colors, red, green, and blue, from outside, the liquid crystal display device comprising: a liquid crystal display panel and a backlight, wherein: a plurality of pixels each including picture elements of four colors or more are arranged in a display region of the liquid crystal display panel; each pixel includes red, green, and blue picture elements, provided with red, green, and blue color filters having colors corresponding to the respective colors of the image signals, and a picture element of another color, provided with a color filter having another color other than the colors of the image signals; a light emission intensity of the backlight can be controlled in accordance with image signals input; the light emission intensity of the backlight when a monochromatic color or a color close to a monochromatic color is displayed in the display region is greater than the light emission intensity when white is displayed in the display region, provided that the term “color close to a monochromatic color” refers to a color when a picture element that transmits light of which components include the monochromatic color and that is included in the picture element of the another color is set to a gradation other than a highest gradation, and a picture element that transmits the monochromatic color is set to a highest gradation; the picture element of the another color is a yellow picture element provided with a yellow color filter; the light emission intensity of the backlight is set to a maximum value among the following five values determined for each pixel: R, G, B, (1+β)×G−β×(1+α)/α×R, and (1+α)×R−α×(1+β)/β×G; and wherein R, G, and B represent intensity of light radiated from the red, green, and blue picture elements, respectively, α represents a ratio of a transmittance amount of red light from the yellow color filter to a transmittance amount of red light from the red color filter, and β represents a ratio of a transmittance amount of green light from the yellow color filter to a transmittance amount of green light from the green color filter.