Accession Number:

AD0751667

Title:

Properties and Limitations of Liquid Crystals for Aircraft Displays.

Descriptive Note:

Final technical rept. 1 Feb 71-30 May 72,

Corporate Author:

HONEYWELL INC BLOOMINGTON MINN CORPORATE RESEARCH CENTER

Personal Author(s):

Report Date:

1972-10-01

Pagination or Media Count:

181.0

Abstract:

The objectives of the study were to determine the feasibility of using nematic liquid crystals as media for aircraft displays from the viewpoint of their temperature range, response time, grey scale and color control. These parameters were determined experimentally for various liquid crystal systems pure compounds as well as mixtures, at various temperatures and under various operating conditions AC and DC drive voltage, cell thickness, reflective and transmissive modes. Mathematical modeling of the temperature range achievable through formation of multiple eutectic mixtures, of response times delay rise, and fall times, of the voltage dependent brightness of reflective and transmissive displays, and of the properties of LC color displays via the forced alignment technique matched the experimental data and was used to define the conditions material, cell construction, and operating parameters under which a temperature range of -54 to 71C, a 1 microsecond response time, a 10-step grey scale in steps of 2 in conjunction with a display brightness and a viewing angle range close to those accepted for paper-and-ink displays and a full color display can be achieved. Author

Subject Categories:

  • Flight Control and Instrumentation
  • Physical Chemistry
  • Electrooptical and Optoelectronic Devices

Distribution Statement:

APPROVED FOR PUBLIC RELEASE