Patent ID: 6628249
Filing Date: 2003-09-30
Classification: G09G,H01L,H05B

Abstract:
A light emitting apparatus comprising:a light emitting section for emitting light, a color of the light being blue shifted with a change in value of a driving current; and a driving section for driving the light emitting section so that the light emitting section emits light having a desired color and a desired intensity, by generating a pulse current based on a signal designating the desired color and a signal designating the desired intensity and by applying said pulse current to the light emitting section, wherein the driving section comprises: a converting section for converting the color-designating signal to a signal designating a peak current value in accordance with current versus emission wavelength characteristics of the light emitting section; a calculating section for calculating a signal designating a duty ratio based on the intensity-designating signal and the peak current value-designating signal, in such a manner that the product of a peak current value designated by the peak current value-designating signal and a duty ratio corresponds to the intensity designated by the intensity-designating signal; and a section for generating, as the driving current, said pulse current having the peak current value and the duty ratio in accordance with the respective current value-designating signal and ratio-designating signal.