Abstract
In illumination systems, it is often necessary to get a structure that
can have good performance on uniformity. Although light-emitting diodes (LEDs)
are replacing conventional light sources in illumination systems, they have
nonuniformity and a large view angle. In this paper, an LED illumination system
has been designed that can use color sequential to replace the color wheel
for projector and also can mix color to get the color you want. An optical
element tapered light pipe is also used in this structure, and we investigate
the mechanism of irradiance distribution. It assists in the design of light
pipe for different applications. The efficiency is above 80% and the uniformity
is better than 60%. The formation of irradiance distribution in the tapered
light pipe is discussed, both analytically and numerically. The result of
the simulation verifies that efficiency of this structure is well enough for
the illumination of both car headlights and interior lighting. This illumination
system also provides a good color-mixing effect that can replace arc lamps
or fluorescent lamps.
© 2009 IEEE
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