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Patent Document 3 discloses an example of a liquid crystal composition containing a compound of the first component, but does not disclose a liquid crystal composition having a negative dielectric constant anisotropy
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[0101] When the sample is a composition, it is directly measured, and the obtained value is described. When the sample is a compound, the sample is prepared by mixing the compound (15 wt %) in mother liquid crystal (85 wt %). The characteristic values of the compounds were calculated from the values obtained by the measurement and by extrapolation. (Extrapolated value)={(measured value of sample)−0.85×(measured value of mother liquid crystal)} / 0.15. When the smectic phase (or crystal) precipitates at 25° C. under this ratio, the ratio of the compound to the mother liquid crystal is sequentially changed to 10wt%: 90wt%, 5wt%: 95wt%, 1wt%: 99wt%. Values of the upper limit temperature, optical anisotropy, viscosity, and dielectric constant anisotropy related to the compound were obtained by this extrapolation method.
[0102] The composition of the mother liquid crystal is as follows. The proportions of ingredients are in wt%.
[0103]
[0104] The measurement of the...
Embodiment 1
[0142] The composition of Example 1 is a liquid crystal composition in which the tetracyclic compound contained in the composition of Comparative Example 1 was replaced with the compound (1-1-3) as the first component.
[0154] Compared with the composition of Comparative Example 1, the composition of Example 1 has a lower minimum temperature of the nematic phase, a smaller viscosity, and a larger negative dielectric constant anisotropy.
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Abstract
Disclosed is a liquid crystal composition that satisfies at least one property of a high upper limit temperature of a nematic phase, a low lower limit temperature of a nematic phase, a low viscosity, a proper optical anisotropy, a negatively large permittivityanisotropy, a large specific resistance, a high stability against ultraviolet light, a high stability against heat and the like, or has a proper balance between at least two of the above properties. Also disclosed is an AM element possessing a short response time, a large voltage retention, a large contrast ratio, and a long service life and the like. The liquid crystal composition that comprises a specific fluorine substituted tetracyclic compound having a high upper limit temperature as a first component and a specific compound having a negatively large permittivityanisotropy as a second component and has a negative permittivityanisotropy. Further disclosed is a liquid crystal display element comprising the composition.
Description
technical field [0001] The present invention mainly relates to a liquid crystal composition suitable for active matrix (active matrix, AM) devices and the like, and AM devices containing the composition. In particular, the present invention relates to a liquid crystal composition with a negative dielectric anisotropy, and to an in-plane switching (IPS) mode, vertical alignment (vertical alignment, VA) mode or polymer sustained alignment (polymer sustained alignment, PSA) mode. Background technique [0002] In liquid crystal display elements, the operation modes based on liquid crystals are classified into phase change (phase change, PC), twisted nematic (twisted nematic, TN), super twisted nematic (super twisted nematic, STN), electrically controlled birefringence (electrically controlled controlled birefringence (ECB), optically compensated bend (OCB), in-plane switching (IPS), vertical alignment (vertical alignment, VA) and polymer sustained alignment (polymer sustained a...
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