5 results about "Rotational viscosity" patented technology

The present invention addresses the problem that a negative [delta][epsilon] value having a large absolute value, a small rotational viscosity ([gamma]1), a large elastic modulus (K33), a low (solid phase)-(nematic phase) transition temperature (Tcn), a high (nematic phase)-(isotropic liquid phase) transition temperature (Tni) and a large voltage holding ratio (VHR) are demanded. The present invention also addresses the problem of providing a rapid-response liquid crystal display element of a VA type, a PSVA type, a PSA type, a FFS type or the like, which is produced using the same, rarely undergoes or never undergoes display failures such as burning-in and display unevenness and has excellent display quality. Provided are: a liquid crystal composition which contains a compound representedby formula (I-1) as a first component and a compound represented by formula (I-2) as a second component and has a negative dielectric anisotropy ([delta][epsilon]) value; and a liquid crystal displayelement produced using the liquid crystal composition.

The invention discloses a liquid crystal compound containing 4-tetrahydropyran and a preparation method and application thereof. The structural general formula of the compound is shown in a formula I (shown in a drawing). The compound has better thermal stability and moderate [delta]n, and a lower threshold voltage can be realized when the compound is applied to an optical device; the compound has very low rotational viscosity and high response speed and has very important practical significance in mixing a liquid crystal mixture with lower rotational viscosity. Thus, the compound is very suitable for mixing the liquid crystal mixture. The liquid crystal mixture containing liquid crystal monomers can be applied to multiple displays, particularly TN-TFT and STN (Super Twisted Nematic) displays, and can also be applied to an IPS display.

The invention belongs to the technical field of liquid crystal compositions, and particularly relates to a liquid crystal composition containing a 2-methyl-3, 4, 5-trifluorobenzene structure. The composition comprises one or more compounds represented by a general formula I, a compound represented by a general formula II and a compound represented by a general formula III. According to the invention, the elastic constant of the liquid crystal composition is increased by adding the compound represented by the general formula I, the dielectric anisotropy of the liquid crystal composition is improved by adding the compound represented by the general formula II, and the rotary viscosity is reduced by adding the compound represented by the general formula III. According to the present invention, the compound represented by the general formula I has characteristics of large elastic constant and low rotary viscosity, such that the elastic constant of the liquid crystal composition can be improved while the rotary viscosity is maintained unchanged so as to meet the high contrast ratio and the rapid response required by the liquid crystal display device.