Comparative study of the dielectric and optical response of PDLC films

Desmond L. Seekola; Jack R. Kelly

doi:10.1117/12.44678

1 June 1991 Comparative study of the dielectric and optical response of PDLC films

Desmond L. Seekola, Jack R. Kelly

Proceedings Volume 1455, Liquid-Crystal Devices and Materials; (1991) https://doi.org/10.1117/12.44678
Event: Electronic Imaging '91, 1991, San Jose, CA, United States

Abstract

The dielelectric response of three types of PDLC films were measured as a function of frequency (1 mHz to 10 kHz) at room temperature. PDLC films containing nematic liquid crystal droplets in different polymer binders -- epoxy (Epon 828), thermoplastic (PMMA), and a UV curable adhesive (Norland 65) -- were studied for a range of droplet sizes. Transmission at normal incidence as a function of the frequency (0.1 Hz to 200 Hz) of the applied field (0 to 120 Vrms) was also measured. The dielectric data show that charge is built up at both the electrode (epoxy films) and droplet/polymer interface (UV, PMMA films). This charge buildup causes a shielding of the field in the droplets, resulting in a much higher switching voltage as shown by the optical transmission. In the PMMA-based film the extent of the shielding is strongly dependent on droplet size.

Citation Download Citation

Desmond L. Seekola and Jack R. Kelly "Comparative study of the dielectric and optical response of PDLC films", Proc. SPIE 1455, Liquid-Crystal Devices and Materials, (1 June 1991); https://doi.org/10.1117/12.44678

ACCESS THE FULL ARTICLE

INSTITUTIONAL
Select your institution to access the SPIE Digital Library.

SELECT YOUR INSTITUTION

PERSONAL
Sign in with your SPIE account to access your personal subscriptions or to use specific features such as save to my library, sign up for alerts, save searches, etc.

PERSONAL SIGN IN

No SPIE Account? Create one

PURCHASE THIS CONTENT

SUBSCRIBE TO DIGITAL LIBRARY

50 downloads per 1-year subscription

Members: $195

Non-members: $335 ADD TO CART

25 downloads per 1 - year subscription

Members: $145

Non-members: $250 ADD TO CART

PURCHASE SINGLE ARTICLE

Includes PDF, HTML & Video, when available