Chiral smectic liquid crystal device having fluorine-containing

Details Chiral smectic liquid crystal device having fluorine-containing Chiral smectic liquid crystal device having fluorine-containing

1995-04-26

1996-11-19

Sikes, Willim L.

Optical: systems and elements

Holographic system or element

Using a hologram as an optical element

359 78, 359100, G02F 11337, G02F 1141

Patent

active

055768644

ABSTRACT:
A liquid crystal device is constituted by a pair of substrates, and a liquid crystal disposed between the substrates. At least one of the substrates has thereon an alignment film. The alignment film is characterized in that (1) it has a surface energy of at most 35 dyne/cm before rubbing and has been rubbed to have a refractive index anisotropy of at least 0.02, or (2) it has been rubbed to have a surface energy difference .DELTA.E of at least 9 dyne/cm and a difference .DELTA..delta. in dispersion term of the surface energy of at least 6 dyne/cm between before and after the rubbing. The alignment film is effective in providing a high contrast and decreasing a delay in optical response causing after-image.

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William et al. "Alignment of Chiral Smectic Liquid Crystals", J. Phys. D: Applied Phys. 19 (1986) pp. L37-L41.

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