Abstract
A preliminary investigation of transmission characteristics of a large number of test cells using dynamic scattering, twisted nematic and guest-host LC mixtures shows that phase change guest-host (PCGH) mixtures are suitable materials for fabricating large size windows to control solar energy. PCGH cells with black dye exhibit a transmission dip near the threshold voltage. The dip is attributed to forward scattering of light during the cholesteric to nematic (or reverse) phase transformation. The nature of the scattering centers created during the transition is not clear at this time. A 6 μm thick 12.5 cm×12.5 cm PCGH LC window has been fabricated. Thickness variation in the liquid cyrstal has been observed to be a major problem in achieving an uniform transmittance throughout the window. However, local transmittance of the window over a small area could be controlled to an accuracy better than 1% using an IBM-personal computer.
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