We report the observation of an electro-optical switching effect from an opaque to a transparent state occurring at a threshold value of the applied field in a Polymer Dispersed Liquid Crystal (PDLC). Optical responses of the composite film under the conditions of an externally applied ac electric field (2-5 Vp-p /Ý) and a film thickness (50Ým), were determined using an Argon laser (wavelength 514 nm). The experimental results showed promising switching times with a rise time of 190 Ýsec and a decay time of 2 msec and an exceptionally high contrast ratio up to 410. These results demonstrate the validity of employing this new PDLC in electro-optical devices.
Fast Electro-Optical Switching and High Contrast Ratio in epoxy-based Polymer Dispersed Liquid Crystals
L Petti;P Mormile;
2003
Abstract
We report the observation of an electro-optical switching effect from an opaque to a transparent state occurring at a threshold value of the applied field in a Polymer Dispersed Liquid Crystal (PDLC). Optical responses of the composite film under the conditions of an externally applied ac electric field (2-5 Vp-p /Ý) and a film thickness (50Ým), were determined using an Argon laser (wavelength 514 nm). The experimental results showed promising switching times with a rise time of 190 Ýsec and a decay time of 2 msec and an exceptionally high contrast ratio up to 410. These results demonstrate the validity of employing this new PDLC in electro-optical devices.I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.
