Ferroelectric liquid crystal mixtures containing lipohilizing, l

Details Ferroelectric liquid crystal mixtures containing lipohilizing, l Ferroelectric liquid crystal mixtures containing lipohilizing, l

1993-04-15

1994-07-26

Sikes, William L.

Optical: systems and elements

Optical computing without diffraction

359104, 25229901, G02F 113

Patent

active

053330757

ABSTRACT:
Electro-optical display devices having a cell thickness of 1 to 10 .mu.m, and containing ferroelectric liquid crystalline mixture, electrodes, alignment layer(s), in which the ferroelectric liquid crystalline mixture has a spontaneous polarization of Ps>20nC.cm.sup.-2 and a natural helical pitch of less than a half of the cell thickness, and contains lipophilizing, lipophilic or amphiphilic compounds for eliminating ionic impurities, Ferroelectric liquid crystal compositions according to the invention show a significantly reduced surface memory effect and an improved display contrast.

REFERENCES:
patent: 5019451 (1991-05-01), Lando
patent: 5135678 (1992-08-01), Murata et al.
HOE 90/F 115 specification (which relates to EP 0,451,822).
HOE 90/F 117 specification (which relates to EP 0,451,820).
HOE 89/F 377K specification (which relates to EP 0,040,081).
HOE 89/F 197k specification (which also relates to EP 0,040,081).

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