Patent ID: 9311886
Filing Date: 2016-04-12
CPC Classification: G09G

Claim Text:
1. A display device comprising: an image display panel on which pixels each including a first sub-pixel for displaying a first color, a second sub-pixel for displaying a second color, a third sub-pixel for displaying a third color, and a fourth sub-pixel for displaying a fourth color are arranged in a two-dimensional matrix; and a signal processing unit that converts an input value of an input signal for an input HSV color space into an output signal for an extended HSV color space extended by the first color, the second color, the third color, and the fourth color to generate an output signal, and outputs the generated output signal to the image display panel, wherein the signal processing unit divides the extended HSV color space into a plurality of spaces based on at least one of a saturation, a brightness, and a hue, and sets limit proportion values different from each other with respect to at least two spaces of the divided spaces respectively, each of the limit proportion values being an upper limit of a proportion of a range exceeding a maximum value of the brightness to the maximum value in the extended HSV color space in a combination of values of the hue and the saturation, calculates an extension coefficient α with respect to the input signal within a range in which a first value does not exceed a second value, the first value being a value among values obtained by multiplying the brightness of a signal of each of the sub-pixels of the input signal by the extension coefficient α, the first value exceeding the maximum value of the brightness, the second value being a value obtained by multiplying the maximum value of the brightness by a limit proportion value set with respect to a space according to the input signal, calculates an output signal of the first sub-pixel based on at least the input signal of the first sub-pixel and the extension coefficient α, and outputs the calculated output signal to the first sub-pixel, calculates an output signal of the second sub-pixel based on at least the input signal of the second sub-pixel and the extension coefficient α, and outputs the calculated output signal to the second sub-pixel, calculates an output signal of the third sub-pixel based on at least the input signal of the third sub-pixel and the extension coefficient α, and outputs the calculated output signal to the third sub-pixel, and calculates an output signal of the fourth sub-pixel based on the input signal of the first sub-pixel, the input signal of the second sub-pixel, and the input signal of the third sub-pixel, and outputs the calculated output signal to the fourth sub-pixel.