Jnc Corporation

Jnc Petrochemical Corporation

Keisuke Izawa

Yuko Katano

Youichiro Ooki

Tomoyuki Matsuda

Rika Hisada

Fumitaka Kondo

Yukio Hirano

A photo-aligning liquid crystal aligning agent for forming a liquid crystal alignment layer capable of materializing a liquid crystal display device, which has a high transmittance while maintaining a liquid crystal aligning property, a voltage holding ratio and the like, and in which flickering is inhibited from being caused after operating for a long time. The photo-aligning liquid crystal aligning agent contains [A] polyamic acid or a derivative thereof which is synthesized by reacting tetracarboxylic acid dianhydride and diamine, and [B] polyamic acid or a derivative thereof obtained by reacting tetracarboxylic acid dianhydride having no photoreactive structure and diamine having no photoreactive structure.

Liquid crystal aligning agents for forming photo-aligning liquid crystal alignment layers, liquid crystal alignment layers and liquid crystal display devices using the same

A photo-aligning liquid crystal alignment layer formed by using a photo-aligning liquid crystal aligning agent containing polyamic acid or a derivative thereof which is synthesized by using tetracarboxylic acid dianhydride having no photoreactive structure having a specific structure and diamine having no photoreactive structure having a specific structure together with at least one of tetracarboxylic acid dianhydride having a photoreactive structure and diamine having a photoreactive structure can reduce storage of residual DC in a liquid crystal display device. Further, the above alignment layer can shorten the relaxation time and can prevent afterimages from being generated.

The present invention relates to a liquid crystal display device including a pair of a substrate arranged opposite to each other, an electrode group disposed on one side or both sides of the pair of substrates facing each other, a plurality of active devices connected to the electrode group, a liquid crystal alignment film disposed on each facing side of the pair of substrates, and a liquid crystal layer interposed between the pair of substrates, wherein the liquid crystal alignment film is manufactured by irradiating linearly polarized light to a film obtained from polyamic acid or a derivative thereof having a photoisomerization structure in the main chain or a film being subject to heat-baking so as to provide alignment-controlling capability, and the liquid crystal layer is a liquid crystal composition having negative (&#x2212;) dielectric anisotropy. By the present invention, a liquid crystal display device having improved image sticking characteristics and good alignment stability is provided.

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Chiba, Japan

Keisuke Izawa