Liquid crystal composition and liquid crystal display device

Details Liquid crystal composition and liquid crystal display device Liquid crystal composition and liquid crystal display device

2010-05-17

2011-12-06

Wu, Shean (Department: 1722)

Stock material or miscellaneous articles

Liquid crystal optical display having layer of specified...

C252S299630, C252S299660, C252S299670

Reexamination Certificate

active

08071182

ABSTRACT:
SubjectThe subject is to provide a liquid crystal composition that satisfies at least one of characteristics such as a high maximum temperature of the nematic phase, a low minimum temperature of the nematic phase, a small viscosity, a large optical anisotropy, a large dielectric anisotropy, a large specific resistance, a high stability to ultraviolet light, a high stability to heat and a short helical pitch, or that is suitably balanced regarding at least two of the characteristics. The subject is also to provide an AM device that has a short response time, a large voltage holding ratio, a large contrast ratio, a long service life, a little light-leak and so forth.Means for Solving the SubjectThe invention provides a liquid crystal composition that has the nematic phase, including a specific optically active compound as a first component and a specific four-ring compound having a high maximum temperature of the nematic phase as a second component, and optionally including a specific compound having a high maximum temperature or small viscosity as a third component and a specific compound having a positively large dielectric anisotropy as a fourth component, and provides a liquid crystal display device including this composition.

REFERENCES:
patent: 5439613 (1995-08-01), Takeshita et al.
patent: 7976912 (2011-07-01), Hiraoka et al.
patent: 7976913 (2011-07-01), Hiraoka et al.
patent: 02-067232 (1990-03-01), None
patent: 05-229979 (1993-09-01), None
patent: 06-200251 (1994-07-01), None

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