Backlight driving device, backlight driving method, and liquid crystal display device

摘要

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