Abstract

CdS in the form of a single crystal is a material exhibiting a steep band edge at the green argon wavelength of 0.515 μm. The thermal shift of this band edge is used to modulate the transmittance of a matrix addressed page-composer for binary data presentation. Short switching pulses in the range of 20 ÷ 50 V applied to evaporated transparent heating elements produce within 100 μsec a 70°C temperature shift in a thin CdS-crystal, being the key element of the page-composer. Contrast ratios of the transmittance of better than 800 and optical efficiencies of 50% are easily obtained in 10 ÷ 20-μm thick samples. Fast parallel switching of twenty-five elements using time multiplex heating has been demonstrated with a 5 × 5 CdS-page-composer. A 16 × 18 matrix is being fabricated, and the implementation of larger arrays accessible in 1 msec appears feasible.

© 1973 Optical Society of America

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