US Patent No. 9,565,730

BACKLIGHT DEVICE AND BACKLIGHT CONTROL METHOD


Patent No. 9,565,730
Issue Date February 07, 2017
Title Backlight Device And Backlight Control Method
Inventorship Katsuyuki Matsui, Tokyo (JP)
Assignee NEC DISPLAY SOLUTIONS, LTD., Tokyo (JP)

Claim of US Patent No. 9,565,730

1. A backlight device, comprising:
a light emitting unit that includes a first light source that emits light of a first light emission color, a second light
source that emits light of a second light emission color, and a third light source that emits light of a third light emission
color, the first, second, and third light emission colors being different from each other;

a detection unit that includes first, second, and third color sensors, the first color sensor having a spectral sensitivity
characteristic corresponding to the first light emission color, the second color sensor having a spectral sensitivity characteristic
corresponding to the second light emission color, the third color sensor having a spectral sensitivity characteristic corresponding
to the third light emission color, the detection unit detecting light to obtain first, second, and third detection values,
respectively, the detected light being a mixture of a first component of the first light emission color emitted from the first
light source, a second component of the second light emission color emitted from the second light source and a third component
of the third light emission color emitted from the third light source;

a temperature sensor that measures a temperature in a proximity of the first, second, and third light sources;
a brightness conversion unit that separates each of the first, second and third detection values to obtain a detection value
of the component of the first light emission color, a detection value of the component of the second light emission color,
and a detection value of the component of the third light emission color, based on a correspondence relationship between the
first, second, and third detection values and the detection value of the component of each of the first, second, and third
light emission colors; and

a calculation unit that corrects the detection values of the components of the first, second, and third light emission colors
for each of the first, second, and third light emission colors by using information indicating a relationship between the
measured temperature and a correction value, the calculation unit determining drive values for the first, second, and third
light sources based on the corrected detection values,

wherein each of the first, second, and third color sensors receives a mixed-color light including the mixture of the component
of each of the first, second, and third light emission colors, and

wherein the brightness conversion unit separates the mixed-color light.