Solar Radiation Control Using NCAP Liquid Crystal Technology

Peter vanKonynenburg; Stephen Marsland; James McCoy

doi:10.1117/12.941885

12 November 1987 Solar Radiation Control Using NCAP Liquid Crystal Technology

Peter vanKonynenburg, Stephen Marsland, James McCoy

Proceedings Volume 0823, Optical Materials Technology for Energy Efficiency and Solar Energy Conversion VI; (1987) https://doi.org/10.1117/12.941885
Event: 31st Annual Technical Symposium on Optical and Optoelectronic Applied Sciences and Engineering, 1987, San Diego, CA, United States

Abstract

A new, advanced liquid crystal technology has made economical, large area, electrically-controlled windows a commercial reality. The new technology, Nematic Curvilinear Aligned Phase (NCAP), is based on a polymeric material containing small droplets of nematic liquid crystal which is coated and laminated between transparent electrodes and fabricated into large area field effect devices. NCAP windows feature variable solar transmission and reflection through a voltage-controlled scattering mechanism. Laminated window constructions provide the excellent transmission and visibility of glass in the powered condition. In the unpowered condition, the windows are highly translucent, and provide 1) blocked vision for privacy, security, and obscuration of information, and 2) glare control and solar shading. The stability is excellent during accelerated aging tests. Degradation mechanisms which can limit performance and lifetime are discussed. Maximum long term stability is achieved by product designs that incorporate the appropriate window materials to provide environmental protection.

Citation Download Citation

Peter vanKonynenburg, Stephen Marsland, and James McCoy "Solar Radiation Control Using NCAP Liquid Crystal Technology", Proc. SPIE 0823, Optical Materials Technology for Energy Efficiency and Solar Energy Conversion VI, (12 November 1987); https://doi.org/10.1117/12.941885

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