Ambient Light Control Using Guest Host Liquid-Crystal Dye Systems
Abstract
This program developed a technology for varying the transmittance of flight-helmet visors from 15-60% under electronic control. It is based on controlling the orientation of dichroic dye molecules, using liquid crystal. No polarizers are used, scattering is low, the color is neutral, the power requirement is low, and the failure mode is clear, i.e., the visor reverts to its maximally transmitting state when power is removed. Demonstration devices were produced on flat PET plastic substrates and toroidal polycarbonate visors of the type used with the HGU-55/P flight helmet. Technical details of the program, remaining problems, and plans for commercialization are discussed.
Document Details
- Document Type
- Technical Report
- Publication Date
- Apr 01, 2003
- Accession Number
- ADA418046
Entities
People
- Bahman Taheri