With the development of LED technology, LED will potentially replace the traditional light source for its cost and size
advantages, especially in the micro-projection system. And since the illumination uniformity and efficiency on spatial
light modulators (SLM) are two important factors in evaluating the performance of micro-projection system, tapered
light pipe (TLP) and square compound parabolic concentrator (SCPC) are often used as beam shaper in LED-based
micro projection system to provide SLM with uniform and efficient illumination. In this paper, in order to overcome the
disadvantage of insufficient compactness induced by the working length of TLP or SCPC for the illumination system, a
total internal reflection (TIR) lens with rotated and faceted structure is designed with an optimization method to couple
and transfer most of the light emitted from LED into a rectangular target plane (RTP) representing SLM. The TIR lens
has six surfaces controlled by 17 dimensional parameters and is designed by optimization of dimensional parameters
with generic algorithms. In order to provide RTP in fixed position with satisfied illumination uniformity and efficiency,
the illumination uniformity and efficiency on RTP are taken into account in the merit function for the optimization
process. In Tracepro program, the simulation result of the LED illumination system with the optimized TIR lens shows
that the illumination efficiency and uniformity has respectively achieved to 61.9%, 76% with considering the limitation
angle of light (15°).
As an important component of a projection display system, its illumination system determines the brightness and uniformity of the whole system. This paper presents a simple design for an illumination system, which has a compound parabolic retroreflector to efficiently utilize the light from a lamp. The performances of this ultrahigh-performance system is described with respect to light efficiency, and uniformity.
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