Abstract
The rapid progress in laser light source development,
particularly in the gallium-nitride material system, means that a
wide range of wavelengths are now available for pico-projection
applications intended to deliver 20 lm or less. In principle, this
affords designers of pico-projection systems great flexibility in
choosing laser wavelengths to optimize specific performance metrics.
With the proliferation of laser-based pico-projectors, however, it
has become clear that current laser safety regulations and their
wavelength-dependent classification criteria play a fundamental role
in determining the brightness roadmaps of scanned-beam and liquid
crystal on silicon (LCoS) pico-projection systems. In this paper, it
is shown that it is possible to choose laser wavelengths to
simultaneously maximize eye-safe luminous flux and color gamut, but
that the resultant values are significantly different for Class 2
and Class 1 eye-safe projection systems.
© 2011 IEEE
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