| 摘要 |
Subject The 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 Subject The 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.
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