Holographically Formed Polymer Dispersed Liquid Crystal Display Devices: Fabrication and Characterization
Abstract
Operating video rate, low power reflective display devices samples were built and delivered. These devices were built in the holographically formed polymer dispersed liquid crystal (HPDLC) fabrication facility at dpiX LLC. The goal was to evaluate the potential of HPDLC material to enable creation of a reflective display technology. The performance goals for the delivered cells included peak reflectance of over 60% for monochrome displays, photopic white reflectance of 50% for stacked cells, switching field strengths of less than 20V/micrometers, and response times of less than 5ms. The devices delivered operated under test conditions with 1 KHz alternating current (ac) drive voltage amplitudes in the range 0-200 V. The measured photopic reflectances of individual red, green, and blue (RUB) sample cells fabricated with a transmissive diffuser in the laser beam were 2 to 9% with respect to a diffuse, white Lambertian, reflection standard and 76 to 95% with respect to a conventional, specular cell as the reflection standard. The measured photopic reflectance of stacked RUB (i.e., white) sample devices were 3.8% for conventional and 1.4% for diffuse HPDLC. Response times were less than 12 ms; switching field strengths, 29 V/micrometers. Operating voltages remain too high and reflection efficiencies, too low.
Document Details
- Document Type
- Technical Report
- Publication Date
- Aug 01, 2001
- Accession Number
- ADA396171
Entities
People
- Alan Lewis
- Hanh Tran
- Jennifer Colegrove
- Thomas F. Fiske