Patent ID: 8587214

Claim:
A backlight device for a screen comprising a plurality of LED modules, wherein each LED module comprises: at least one red LED, at least one green LED and at least one blue LED; a sensor device configured to detect at least one physical quantity; and a drive device for driving the at least one red LED, the at least one green LED and the at least one blue LED based on a signal from the sensor device, wherein each of the at least one red LED, the at least one green LED and the at least one blue LED are configured to be driven independently of one another by the drive device; wherein each of the at least one red LED, the at least one green LED and the at least one blue LED have a respective shunt transistor connected in parallel thereto, each shunt transistor configured to be controlled by the drive device to reduce the current flowing through the respective LED connected in parallel thereto based on the physical quantity detected by the sensor device, wherein corresponding ones of the at least one red LED of each of the plurality of LED modules are connected in series across each module, corresponding ones of the at least one green LED of each of the plurality of LED modules are connected in series across each module, and corresponding ones of the at least one blue LED of each of the plurality of LED modules are connected in series across each module, and wherein the at least one red LED, the at least one green LED and the at least one blue LED are not connected in series with each other in each individual LED module.