Patent ID: 7170234

Claim:
A light emitting apparatus generating white light by mixing of light of a plurality of oscillation wavelengths, comprising: a first light emitting device; a second light emitting device having an oscillation wavelength different from that of said first light emitting device; a power supply node for applying a voltage to said first light emitting device and said second light emitting device; and a modulation circuit for adjusting a lighting time of each of said first light emitting device and said second light emitting device by controlling an ON/OFF state of a current flowing through each of said first light emitting device and said second light emitting device to obtain desired intensity of mixed light from said first light emitting device and said second light emitting device; wherein a value of a current flowing from said power supply node into each of said first light emitting device and said second light emitting device is gradually changed to adjust chromaticity of mixed light from said first light emitting device and said second light emitting device to obtain a desired white color.