This paper describes work on generating arrays of stable states using a liquid crystal light valve (LCLV) and optical spatial feedback. Among the topics to be discussed will be feedback containing one and two LCLV's, giving both oscillatory and exponential decay to equilibrium, the possibility of obtaining more than two stable states in a given image element.
S. A. Collins,
U. H. Gerlach,
Z. M. Zakman,
"Optical Feedback For Generating Arrays Of Bistable Elements", Proc. SPIE 0185, Optical Processing Systems, (10 August 1979); doi: 10.1117/12.957471; https://doi.org/10.1117/12.957471