Patent ID: 8451299
Filing Date: 2013-05-28
Classification: G09G

Abstract:
1. A controller for adjusting a signal outputted to a hold-type image display panel, comprising: a video signal converting part having a double-speed drive conversion function which divides one frame of a video signal to a plurality of sub-frames, and a color conversion function which converts a video signal of three primary colors to a video signal of four or more colors including the three primary colors and a compound color; and a sub-frame converting part which converts, the video signal converted by the video signal converting part, to a signal having a plurality of different gradations whose average luminance value becomes equivalent to luminance of the video signal converted by the color converting part, and takes each of the plurality of gradations as each of gradations of the plurality of sub-frames, wherein the video signal converting part includes: a double-speed drive converting part which executes the double-speed drive conversion function for the inputted video signal; and a color converting part which executes the color conversion function for the video signal that is divided into the plurality of sub-frames by the double-speed drive converting part, in such a manner that a maximum gradation of the video signal of the four or more colors becomes smaller than a maximum gradation of the video signal of the three primary colors and a luminance ratio with respect to RGB matrix of the four or more colors has only a small change in comparison to a luminance ratio with respect to RGB matrix of the three or more colors wherein the color converting part comprises: a scaling factor calculating part which calculates a scaling factor from a maximum gradation of the video signal of the three primary colors and a gradation of the video signal of the four or more colors; and a scaling luminance setting part which calculates scaling relative luminance from relative luminance of the video signal of the four or more colors and the scaling factor, wherein the color converting part includes an efficiency setting part which adjusts the scaling factor based on a luminance efficiency that is set arbitrarily; and the scaling luminance setting part calculates the scaling relative luminance by using adjusted scaling factor that is being adjusted by the efficiency setting part, and wherein the scaling factor calculating part calculates the scaling factor S as “S=Max(L the efficiency setting part calculates the adjusted scaling factor S the scaling luminance setting part calculates the scaling relative luminance (L