Patent ID: 7638956

Claim:
A method of calibrating a plurality of monochromatic light beams outputted by a plurality of light emitting diodes comprising steps of: providing a plurality of reference values of the plurality of monochromatic light beams; providing a brightness reference value of a light formed of the plurality of monochromatic light beams; sensing a plurality of first light signals of the plurality of monochromatic light beams outputted by the plurality of light emitting diodes; sensing a second light signal of the light formed of the plurality of monochromatic light beams; comparing the plurality of the first light signals of the plurality of monochromatic light beams with the plurality of the reference values of the plurality of monochromatic light beams; comparing the second light signal of the light formed of the plurality of monochromatic light beams with the brightness reference value of the light formed of the plurality of monochromatic light beams; and calibrating the plurality of monochromatic light beams outputted by the plurality of light emitting diodes according to a result of comparing the plurality of first light signals with the plurality of reference values and a result of comparing the second light signal with the brightness reference value.