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Dynamic Thresholding with the Three-Terminal Optically Addressed Spatial Light Modulator

Published online by Cambridge University Press:  21 February 2011

Robert A. Rice ,
Peter J. Close  and
Garret Moddel
Robert A. Rice
Affiliation:
Department of Electrical and Computer Engineering and Optoelectronic Computing Systems Center, University of Colorado, Boulder, CO 80309–0425
Peter J. Close
Affiliation:
Department of Electrical and Computer Engineering and Optoelectronic Computing Systems Center, University of Colorado, Boulder, CO 80309–0425
Garret Moddel
Affiliation:
Department of Electrical and Computer Engineering and Optoelectronic Computing Systems Center, University of Colorado, Boulder, CO 80309–0425
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Abstract

Standard, non-patterned optically addressed spatial light modulators (OASLMs), comprising an a-Si:H photodiode and a ferroelectric liquid crystal (FLC), have a fixed write-light intensity threshold when driven at a particular frequency. We present a patterned OASLM in which the threshold may be varied. The structure and operation of this device is significantly different from the standard OASL.M. While the square-wave drive for the non-patterned OASLM provides a time-varying voltage for the device, the thresholding OASLM uses a dc drive, with spatially separated bias voltages. By varying the voltage applied to a patterned metal layer between the a-Si:H and FLC, we achieved dynamic thresholding over one decade of write-light intensity. Fabricated devices have response times as low as 200 μsec, and contrast ratios as high as 50:1.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 258: Symposium A – Amorphous Silicon Technology – 1992 , 1992 , 1087
Copyright
Copyright © Materials Research Society 1992

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References

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