Dynamic Thresholding with the Three-Terminal Optically Addressed Spatial Light Modulator Journal Article uri icon



  • ABSTRACTStandard, 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 ╬╝sec, and contrast ratios as high as 50:1.

publication date

  • January 1, 1992

has restriction

  • closed

Date in CU Experts

  • April 11, 2014 11:35 AM

Full Author List

  • Rice RA; Close PJ; Moddel G

author count

  • 3

Other Profiles

International Standard Serial Number (ISSN)

  • 0272-9172

Electronic International Standard Serial Number (EISSN)

  • 1946-4274

Additional Document Info


  • 258


  • 1087