Optical Pattern Processing Utilizing Nematic Liquid Crystals
- 1 October 1972
- journal article
- Published by Optica Publishing Group in Applied Optics
- Vol. 11 (10), 2223-2227
- https://doi.org/10.1364/ao.11.002223
Abstract
This paper describes a new type of optical processing based on the dynamic scattering effect in liquid crystals. It is possible to realize a binary spatial filter with nematic liquid crystals and to control the optical modes by voltage signals. A two-dimensional Walsh function is used for extracting properties of the input patterns. The realization of an 8 × 8 Walsh function filter with nematic liquid crystals is demonstrated. The contrast ratio is over 30 to 1. The variation in transparency is within ±3%. Experimental results show that it is possible to extract the properties of handwritten characters by detecting the intensity of light transmitted through both the input pattern and the liquid crystal filter.This publication has 5 references indexed in Scilit:
- Hadamard–Transform Image ScanningApplied Optics, 1970
- Electronically Scanned Analog Liquid Crystal DisplaysApplied Optics, 1970
- Hadamard transform image codingProceedings of the IEEE, 1969
- Dynamic scattering: A new electrooptic effect in certain classes of nematic liquid crystalsProceedings of the IEEE, 1968
- Reflective liquid crystal television displayProceedings of the IEEE, 1968