Improved Materials for DC Dynamic Scattering at Elevated Temperatures.
Abstract
Liquid crystal (LC) mixtures and a sealant suitable for dc-activated dynamic scattering (DS) matrix displays are developed for wide range storage temperature (-60 to 80 deg C) and for elevated temperature operation. Three improved eutectic nematic mixtures are formulated with nematic ranges (undoped) of 0 to 74, -4 to 82, and -13 to 78 deg C, with flow viscosities of 31, 32, and 36 cP, respectively. Several types of sealants are tested in contact with LC and are evaluated according to the level of contamination they introduce at elevated temperature. One UV-curved sealant shows no apparent degradation effects after more than 18000 hours of 100 deg C heating with an undoped ester LC in a vacuum-filled test cell made with this sealant. The viscosity, dielectric anistropy, conductivity anisotropy, and dc-activated DS effects are studied as a function of temperature for one of the mixtures. Response times of DS as a function of temperature (25 deg C to 65 deg C) and cell thickness are also studied.
Document Details
- Document Type
- Technical Report
- Publication Date
- Jun 01, 1984
- Accession Number
- ADA143076
Entities
People
- A. M. Lackner
- J. D. Margerum
Organizations
- HRL Laboratories