Atomic beam alignment of liquid crystals

Details Atomic beam alignment of liquid crystals Atomic beam alignment of liquid crystals

1996-05-10

1998-06-23

Gorgos, Kathryn L.

Chemistry: electrical and wave energy

Processes and products

Processes of treating materials by wave energy

2041576, 20415763, 349124, 349126, C07C 100, C07F 100, G02F 11339

Patent

active

057708266

ABSTRACT:
We have found that liquid crystals can be aligned on a polyimide surface exposed to a low energy and neutral Argon ion beam. The energy of the incident ions were varied between 75 and 500 eV, the integrated current density from 100 .mu.A/cm.sup.2 to 500 mA/cm.sup.2, and the angle of incidence over which alignment was measured was between 10 and 20 degrees. The pretilt angle of the liquid crystals could be varied between 0 and 8 degrees, by controlling the processing conditions. Degradation of the polyimide, which leads to charge migration, can be avoided by operating at low accelerating voltages.

REFERENCES:
patent: 4030997 (1977-06-01), Miller et al.
patent: 4153529 (1979-05-01), Little et al.
patent: 5030322 (1991-07-01), Shimada et al.
patent: 5032009 (1991-07-01), Gibbons et al.
patent: 5395495 (1995-03-01), Nozaki
DT 2818-079--Siemens, Nov. 1979.
DT 2815-481--Braun AG., Oct. 1979.

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