Patent ID: 9613571
Date: 2017-04-04
CPC Classifications: G09G

Claim:
1. A display device comprising: an image display unit in an image display region, the image display unit including a plurality of main pixels each including sub-pixels, wherein the sub-pixels include a red pixel, a green pixel, and a blue pixel; a light source portion that irradiates the image display region with illumination light; a signal correction unit that calculates saturation and value of the main pixels based on first color information to be displayed on a predetermined pixel, the first color information being obtained based on an input video signal, and generates second color information by correcting the first color information based on the calculated saturation and value; a signal processing unit that calculates the saturation and the value of the main pixels based on the second color information, and generates a control signal for determining light source luminance of the light source based on the calculated saturation and value; and a light source control unit that controls luminance of the light source based on the control signal, wherein, in a case where each of the calculated saturation and value of the main pixels of the first color information is equal to or smaller than a predetermined threshold, the signal correction unit generates a light source luminance signal that reduces the light source luminance, and outputs the light source luminance signal to the signal generation unit, wherein the signal processing unit generates the control signal obtained by reducing power consumption of the light source portion based on the value obtained by the following expression (1) and the saturation obtained by the following expression (2): wherein the signal processing unit calculates an output signal, the light source luminance of which is reduced, based on the following expression (3) to (6): wherein in the expression (1) and the expression (2), Rin represents an input signal to the red pixel, Gin represents an input signal to the green pixel, Bin represents an input signal to the blue pixel, YR represents a value ratio of the red pixel, YG represents a value ratio of the green pixel, and YB represents a value ratio of the blue pixel.