Polarised LM of a liquid crystal display

Polarised LM of a liquid crystal display

A608/0043 Rights Managed

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Credit: MICHAEL W. DAVIDSON/SCIENCE PHOTO LIBRARY

Caption: Polarised light micrograph of a liquid crystal display (LCD) of the type used to represent numerical figures. Although liquid crystal (LC) flows like a fluid its molecular arrangement exhibits some order. An LCD has a film of LC sandwiched between crossed polarizers & set on top of a mirror. In the 'off' state (as here) light is able to traverse both polarizers, penetrate the LC and reflect back off the mirror. In the 'on' state (see: A608/042) an electric field applied across the LC alters its molecular alignment and hence its polarizing properties; light cannot traverse both polarizers to reach the mirror and the display appears dark.

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Keywords: chemical, chemistry, compound, compounds, crystal, crystal display, crystals, light micrograph, liquid, liquid crystal display

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