Patent ID: 7176640

Claim:
A control device for controlling a backlight unit having a group of light emitting elements including light emitting elements of red color, light emitting elements of green color and light emitting elements of blue color, the light emitting elements of different colors being electrically connected separately, the control device comprising: electric current supply means for supplying a predetermined drive current to the group of light emitting elements; quantity of emitted light detecting means for detecting the quantity of light emitted from the group of light emitting elements as a function of the electric current supplied from the electric current supply means; temperature detecting means for detecting the temperature of the backlight unit; reference quantity of light outputting means for outputting a reference quantity of light for the light emitting elements of each color; and control means for controlling the electric current supply means so as to make it supply a constant drive current to the light emitting elements of blue color according to the quantity of emitted light detected by the quantity of emitted light detecting means, the temperature detected by the temperature detecting means, and the reference quantity of light output from the reference quantity of light outputting means and supply a predetermined drive current to the light emitting elements of red color and those of green color according to the constant drive current supplied to the light emitting elements of blue color.