Patent ID: 7295180

Claim:
A backlight driving device for controlling driving of a backlight device for display, said backlight device generating predetermined white light by mixing light from a plurality of light emitting diodes of three or more colors, said backlight driving device comprising: storing means for storing an initial amount of current and a predetermined multiplication coefficient for each color; light quantity detecting means for detecting a light quantity for each color; and controlling means for adjusting an amount of current passed through said light emitting diodes of each color by feedback control on a basis of a detection output from said light quantity detecting means with an amount of current obtained by multiplying said initial amount of current by said predetermined multiplication coefficient as an initial value, whereby said predetermined white light is generated; wherein when a difference between the amount of current after the feedback control and said initial amount of current exceeds a predetermined threshold value, said controlling means updates said multiplication coefficient according to the amount of current after said feedback control.