Patent ID: 8780029
Filing Date: 2014-07-15
Classification: G02F,G09G

Abstract:
1. A signal conversion circuit for use in a multiprimary liquid crystal display device, the multiprimary liquid crystal display device having a pixel defined by a plurality of subpixels including a red subpixel, a green subpixel, a blue subpixel, and a yellow subpixel, and performing multicolor display by using four or more primary colors to be displayed by the plurality of subpixels, the signal conversion circuit converting an input video signal to a multiprimary signal corresponding to four or more primary colors, wherein, when any of a plurality of video signals for the pixel to display a gray color having a normalized luminance of no less than 0.2 and no more than 0.3 is input, the signal conversion circuit converts the plurality of video signals so that, among normalized luminances of the plurality of subpixels, the yellow subpixel has the lowest normalized luminance; and when at least one of the plurality of video signals for the pixel to display a gray color, which is an achromatic color of an intermediate gray scale and has an arbitrary normalized luminance of more than zero, is input, a normalized luminance of each of the plurality of subpixels is greater than zero, and the normalized luminance of the yellow subpixel is lower than a normalized luminance of any other one of the plurality of subpixels.