Liquid crystal composition and liquid crystal display device thereof

Abstract

The invention provides a liquid crystal composition, which comprises at least one compound represented by a general formula I and at least one compound represented by a general formula N. The invention also provides a liquid crystal display device containing the liquid crystal composition. The liquid crystal composition provided by the invention has high optical anisotropy, high clearing point, high transmittance, high epsilon perpendicular to director / delta epsilon, large Kave and good low-temperature stability, so that the liquid crystal display device containing the liquid crystal composition has high transmittance and less light scattering, and has good display effect.

Description

technical field [0001] The invention relates to the field of liquid crystal materials, in particular to a liquid crystal composition and a liquid crystal display device thereof. Background technique [0002] Liquid crystal material is a mixture of organic rod-shaped small molecular compounds that have both fluidity of liquid and anisotropy of crystal at a certain temperature. Liquid crystal display devices use the optical anisotropy and dielectric anisotropy of liquid crystal materials to work, and have been widely used at present. The classification of liquid crystal display elements based on the operation mode of liquid crystal molecules is: phase change (phase change, PC), twisted nematic (twisted nematic, TN), supertwisted nematic (supertwisted nematic, STN), dynamic scattering (dynamic scattering, DS ), ferroelectric liquid crystal (FLC), guest-host (guest-host, GH), electrically controlled birefringence (ECB), optically compensated bend (OCB), coplanar switching (in- ...

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Problems solved by technology

[0013] According to the transmittance formula of IPS mode Transmittance (transmittance, T)∝|Δε| / ε ⊥ ("∝" means "inversely proportional" relationship), if you want to increase the transmittance of the liquid crystal material, you can try to reduce the Δε of the liquid crystal material, but generally the adjustment range of the driving voltage of the same product is limited

In addition, the liquid crystal molecules will tilt to the Z-axis direction under the action of the vertical component of the fringe electric field, resulting in a change in their optical anisotropy Δn, according to the formula (wherein, χ is the angle between the optical axis of the liquid crystal layer and the optical axis of the polarizer, Δn is the optical anisotropy, d is the cell spacing, and λ is the wavelength) it can be seen that the effective Δn*d will affect T, if the positive The transmittance of liquid crystal materials can also be considered to increase Δn*d, but the retardation design of each product is fixed

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