Abstract
This paper demonstrates an optical design of miniature of LCOS optical
engine and optics with white light-emitting diode (LED) and the most
importantly, proposes a new optimization method for non-image optics via
Genetic Algorithm (GA) written in Optical Software ASAP, in order to achieve
best performance for light efficiency and uniformity. Thanks to the
development of modern digital equipment, optimization work for non-image
optics plays a role in modern optical engineering. So far Least Damping
Square, Taguchi Fuzzy, and simulation annealing methods have been introduced
and some of them has been applied to many items of commercial simulation
software. However, GA is first introduced in this paper for non-image
optical design and optimization, although it has been for many years been
used as effective optimization method in image optics; In this paper, GAs
are written in the form of macro language from ASAP. During the design
process, we used one OPTEK Technology OVS3WBCR44 LED as the light source of
the general projection display. Because of the extensiveness of the LEDS,
the collection efficiency within the desired acceptance angle was not
expected to be high. Due to the particular acceptance angle (cone), we
needed a condenser lens system, which satisfied the light small angle
incident to 0.59-in liquid-crystal-on-silicon (LCOS) pixels. The optical
engine in this paper is designed for a compact LCOS projector with a white
LED light source and the employment of an LCOS panel has been reduced to one
piece in order to get the best volumetric size. Optical design specification
is mainly for an 11$^{\prime\prime}$ projected screen, whose objective distance is close to 420 mm
with fixed focal lens. GA methods are applied in this research in order to
achieve maximum brightness and uniformity. Compared to traditional
optimization methods, such as Least Damping Square, the GA used in this
research gives reasonably good results.
© 2009 IEEE
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