US Patent No. 9,047,825

DISPLAY DEVICE AND DISPLAY METHOD


Patent No. 9,047,825
Issue Date June 02, 2015
Title Display Device And Display Method
Inventorship Katsuyuki Matsui, Tokyo (JP)
Assignee NEC Display Solutions, Ltd., Tokyo (JP)

Claim of US Patent No. 9,047,825

1. A display device in which a plurality of backlights for different primary colors are provided and a liquid crystal panel
is irradiated from a display back surface by the backlights to display a color image, the display device comprising:
a display unit which displays two images of a first video signal and a second video signal on one screen;
a luminance and color temperature setting unit which sets a luminance and a color temperature of white points of the first
video signal and the second video signal;

a calculation unit which calculates, for each of the colors of the backlights, a required luminance according to the set luminance
for each of the first video signal and the second video signal, and obtains the higher one of the required luminance corresponding
to the first video signal and the required luminance corresponding to the second video signal as an objective luminance for
each color based on a calculation result;

a backlight driving unit which drives the backlight for each color according to the objective luminance for each color obtained
by the calculation unit;

a detection unit which compares the required luminance with the objective luminance and detects, for each color, the required
luminance corresponding to the video signal lower than the objective luminance among the required luminance corresponding
to the first video signal and the required luminance corresponding to the second video signal; and

a brightness adjustment unit which performs adjustment for each color so that an image corresponding to the video signal lower
than the objective luminance among the required luminance corresponding to the first video signal and the required luminance
corresponding to the second video signal is darkened according to a detection result of the detection unit.