Patent ID: 6396218
Filing Date: 2002-05-28
Classification: H04N,H05B

Abstract:
An illumination apparatus for a scanning device, comprising:a plurality of electroluminescent elements, each said element comprising a transparent electrode with a top surface, a radiation generating stack under said transparent electrode, and a second electrode under said radiation generating stack, said second electrode having a bottom surface, wherein a first one of said plurality of electroluminescent elements has a first light emitting characteristic that is different from a light emitting characteristic of a second one of said plurality of electroluminescent elements; and a voltage source having a plurality of phase characteristics coupled across said electrodes of each of said electroluminescent elements for applying a voltage to each of said electroluminescent elements, wherein said voltage source applies a voltage having a first phase characteristic to a first one of said plurality of electroluminescent elements and a voltage having a second phase characteristic to a second one of said plurality of electroluminescent elements, such that the frequency of light pulses emitted from both said first and said second electroluminescent elements exceeds the frequency of light pulses emitted from only the first said electroluminescent element.