Anisotropic retardation layers for display devices

Details Anisotropic retardation layers for display devices Anisotropic retardation layers for display devices

1997-09-05

1999-09-07

Kelly, C. H.

Stock material or miscellaneous articles

Liquid crystal optical display having layer of specified...

With charge transferring layer of specified composition

428426, 349 75, 349117, 25229901, 564 95, C09K 1900, C09K 1952, G02F 1133, C07C32100

Patent

active

059484870

ABSTRACT:
A composition that includes the following compounds: ##STR1## wherein R.sup.1, which may be the same or different, is a hydrophilic group; R.sup.2, which may the same or different, is selected from the group consisting of electron donating groups, electron withdrawing groups, and electron neutral groups; R.sup.3 is a positively charged heteroaromatic ring linked to the triazine backbone through a nitrogen atom in the R.sup.3 ring; and X.sup.- is a counterion. If R.sup.3 is an unsubstituted pyridine, the counterion X.sup.- may be selected from any counterion other than Cl.sup.- and OH.sup.-. Otherwise, the counterion X.sup.- may be selected from any counterion. The compound may be applied to a substrate to form a birefringent optical retardation device. The retardation device may be used in display devices such as computers and the like to correct the phase and polarization states of the display's emitted light and improve image quality at viewing angles away from the normal.

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Goldmann, Daniela et al., "New disc-shaped triarylamino-1,3,5-triazines with heteroaromatic central cores", Liquid Crystals, vol. 21, No. 5, pp. 619-623 (1996).

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