An illumination engine for a projection display using light emitting diodes (LEDs)
that includes a reflector having a first and second focal points, a source of electro-luminescence
located proximate to the first focal point to emit rays of radiation in a first
range of wavelengths that reflect from the reflector and converge substantially
at the second focal point, and a light pipe having an first input end and a first
output end, the first input end being located proximate to the second focal point
to collect substantially all of the radiation and wherein the first output end
transmits substantially all of the radiation. The illumination system may further
include a substrate having a first side, a platform disposed proximate to the first
side of the substrate, and a plurality of reflectors each having a first and second
focal points disposed in the platform, each of the first and second focal points
disposed proximate to the first side of the substrate, a plurality of sources of
electro-luminescence disposed on the first side of the substrate, each of the sources
of electro-luminescence disposed substantially coincident with a corresponding
one of the first focal points to emit rays of electromagnetic radiation that reflect
from a corresponding one of the plurality of reflectors and converges substantially
at a corresponding one of the second focal points, a plurality of light pipes disposed
in the substrate, each of the light pipes having an input end and an output end,
each of the input ends disposed substantially coincident with a corresponding one
of the second focal points to collect substantially all of the radiation, wherein
each of the output ends transmits substantially all of the radiation emitted by
a corresponding one of the plurality of sources.
