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Optical Engineering

Pixel image analysis of light valve projector considering apodization caused by illumination
Author(s): Shinsuke Shikama; Hiroshi Suzuki; Takao Endo; Akira Sekiguchi
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Paper Abstract

We discuss the effect of apodization on an entrance pupil of projection optics in a light valve (LV) projector. During a design process of projection optics, uniform illumination on its entrance pupil is generally assumed. However, actual illuminance distribution on the entrance pupil is not uniform due to an influence of a lamp and reflector construction. The numerically calculated angular intensity distribution from a light source is converted to an illuminance distribution on the entrance pupil. By considering the illuminance distribution as an apodization function, an image of projected pixels as well as the modulation transfer function (MTF) and encircled energy function (EEF) are calculated. By the pixel image simulation, apodization is found to improve the separation between pixels and the edge blur of a pixel. Considering the apodization, the MTF at the second harmonic of the fundamental frequency increases by 1.39 times and the radius of the EEF at 50% energy decreases by 0.66 times. As the pixel density of LV increases, this simulation method becomes more useful for improving the evaluation accuracy of design and manufacturing tolerance of high-resolution projection displays with stringent optical specifications.

Paper Details

Date Published: 1 June 2004
PDF: 6 pages
Opt. Eng. 43(6) doi: 10.1117/1.1737786
Published in: Optical Engineering Volume 43, Issue 6
Show Author Affiliations
Shinsuke Shikama, Mitsubishi Electric Co. (Japan)
Hiroshi Suzuki, Mitsubishi Electric Corp. (Japan)
Takao Endo, Mitsubishi Electric Corp. (Japan)
Akira Sekiguchi, Mitsubishi Electric Corp. (Japan)


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