Alignment film for LCD using photoreactive polymer and LCD...

Stock material or miscellaneous articles – Liquid crystal optical display having layer of specified... – Alignment layer of specified composition

Reexamination Certificate

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C428S001100, C428S001300, C252S299010, C252S299600, C430S020000

Reexamination Certificate

active

07541073

ABSTRACT:
The present invention provides a composition for forming a liquid crystal alignment film, which comprises a photoreactive polymer including a multicyclic compound having a photoreactive group on a main chain thereof. The present invention also provides a liquid crystal alignment film produced using the composition, and a liquid crystal display including the liquid crystal alignment film. The photoreactive polymer including the multicyclic compound on the main chain thereof has a high glass transition temperature, thus thermal stability is excellent. Since lattice vacancy is relatively large, the photoreactive group is capable of moving relatively freely in the main chain of the polymer, thus it is possible to improve a slow photoreaction rate, which is considered a disadvantage of a conventional polymer material.

REFERENCES:
patent: 5464669 (1995-11-01), Kang et al.
patent: 2006/0160970 (2006-07-01), Kim et al.
patent: 11-181127 (1999-07-01), None
patent: 2002-047318 (2002-02-01), None
patent: 10-2002-0023172 (2002-03-01), None
Dyaduysha, Andrey, et al.,Pecularity of an Oblique Liquid Crystal Alignment Induced by a Photosensitive Orientant, Jpn. J. Appl. Phys. vol. 34, 1995, pp. L1000-L1002.
Schadt, Martin, et al.,Surface-Induced Parallel Alighment of Liquid Crystals by Linearly Polymerized Photopolymers, Jpn. J. Appl. Phys. vol. 31, 1992, pp. 2155-2164.

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