Reflective-type liquid crystal displays using mixed-mode twist n

Details Reflective-type liquid crystal displays using mixed-mode twist n Reflective-type liquid crystal displays using mixed-mode twist n

1995-10-23

1999-08-03

Dang, Hung Xuan

Liquid crystal cells, elements and systems

Particular structure

Having significant detail of cell structure only

349117, 349181, G02F 11335

Patent

active

059332077

ABSTRACT:
An optical display employs a liquid crystal cell with a d.DELTA.n/.lambda. of approximately 0.2-0.8, allowing the cell's optical transmissivity to be modulated by an applied electric field through a dominant non-polarization rotation effect. For visible wavelengths, d.DELTA.n is approximately 0.1-0.4 microns, with a preferred value of about 0.25 microns. Applications include a reflective projection display in which input light is polarized at a greater than 0.degree. and less than 90.degree. angle, preferably about 20.degree., to the input LC directors of a twisted nematic cell; a reflective direct view system in which a quarter-wave plate is substituted for a polarization analyzer; and both a reflective and a transmissive guest-host system in which optical absorption by dye molecules is the dominant modulation mechanism.

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Cole and Kashnow, "A new reflective dichronic liquid-crystal display device", Applied Physics Letters, vol. 30, No. 12, Jun. 15, 1977, pp. 619-621.

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