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Proceedings Paper

Double side lenslet array for illumination optics of laser projector
Author(s): Po-Chou Chen; Chien-Chuan Chen; Po-Hung Yao; Cheng-Huan Chen
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Paper Abstract

Laser is an ideal illumination light source for liquid crystal projection displays in terms of source Etendue and polarization. In order to make a conversion from a circular Gaussian laser beam profile to a rectangular uniform distribution on the microdisplay, a double side microlens array has been proposed as a homogenizer, and a cylindrical lens is exploited for shaping the aspect ratio of illumination pattern. The design and simulation based on scalar diffraction theory have shown that two identical lenslet arrays on each side of a thin plastic substrate with a lateral shift of half diagonal pitch can convert laser beam into a uniform square illumination at a specified near field. The pitch and curvature of the lenslet are major parameters for modifying the illumination distance, area and uniformity. The proposed lenslet array will provide an economical solution for the illumination optics of laser based light valve projector due to its regular and circular lenslet profile.

Paper Details

Date Published: 3 February 2009
PDF: 9 pages
Proc. SPIE 7232, Emerging Liquid Crystal Technologies IV, 72320X (3 February 2009); doi: 10.1117/12.808231
Show Author Affiliations
Po-Chou Chen, National Tsing Hua Univ. (Taiwan)
Chien-Chuan Chen, National Tsing Hua Univ. (Taiwan)
Po-Hung Yao, National Tsing Hua Univ. (Taiwan)
Cheng-Huan Chen, National Tsing Hua Univ. (Taiwan)


Published in SPIE Proceedings Vol. 7232:
Emerging Liquid Crystal Technologies IV
Liang-Chy Chien; Ming Hsien Wu, Editor(s)

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