Abstract
ABSTRACT Liquid crystal microdroplets trapped into silica gel glasses by sol-gel processes maybe used for displayapplications. Gel-glass dispersed liquid crystals (GDLC) are switched between opaqueand transparentstates by applying external AC-voltage signals; no polarizers are required. Contrast ratio isenhanced inprojection mode as scattering from liquid crystal microdroplets is increased. Coloremissive projectiondisplays may be obtained by placing fluorescent RGB masks on the back plane; a UV lamp overthe frontplane excites the chromophors located under switched pixels, whereas unswitched pixels scatter theincoming UV light and the residual fluorescence. This setup takes advantage of the photostability of sol-gel glasses as compared to similar systems such as polymer-dispersed liquid crystals (PDLCs).Keywords: Gel-glass dispersed liquid crystals, doped sol-gel glasses, projectiondisplay. 1. INFRODUCTION Polymer-dispersed liquid crystals (PDLCs)1, developed some 10 years ago, are a new approach tothe
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