13 October 1994 Gel-glass dispersed liquid crystal projection display
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Abstract
Liquid crystal microdroplets trapped into silica gel glasses by sol-gel processes may be used for display applications. Gel-glass dispersed liquid crystals (GDLC) are switched between opaque and transparent states by applying external ac-voltage signals; no polarizers are required. Contrast ratio is enhanced in the projection mode as scattering from liquid crystal microdroplets is increased. Color emissive projection displays may be obtained by placing fluorescent RGB masks on the back plane; a UV lamp over the front plane excites the chromophors located under switched pixels, whereas unswitched pixels scatter the incoming 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).
© (1994) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.
David Levy, Xabier Quintana, Covadonga Rodrigo, Jose Manuel Oton, "Gel-glass dispersed liquid crystal projection display", Proc. SPIE 2288, Sol-Gel Optics III, (13 October 1994); doi: 10.1117/12.188988; https://doi.org/10.1117/12.188988
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KEYWORDS
Liquid crystals

Ultraviolet radiation

LCDs

Glasses

Opacity

Light scattering

RGB color model

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