Transmittance of liquid-crystal cells: A comparison
| ISSN: |
1089-7550
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| Source: |
AIP Digital Archive
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| Topics: |
Physics
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| Notes: |
A liquid-crystal window has been considered as an optical shutter to control solar energy. Transmittance of dynamic-scattering, twisted-nematic, and phase change guest-host (PCGH) cells having 6, 9, and 12 μm thicknesses has been measured and compared. A PCGH cell with black dye exhibits an anomalous transmission dip in the region of cholesteric to nematic or vice versa phase transformation for incident incoherent light of λ〈500 μm. We attribute this dip to voltage-induced inhomogeneities generated during the phase transition. Transmittance controllability as high as 50% has been achieved with a 6-μm-thick PCGH cell with one polarizer. A comparison of the transmittances of the three types shows that PCGH material is a suitable candidate for large size window fabrication.
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| Type of Medium: |
Electronic Resource
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| URL: |