Liquid crystal composition and liquid crystal display element using same

Abstract

A liquid crystal composition including one or two or more compounds selected from the group consisting of compounds represented by general formula (i) shown below, and one or two or more compounds selected from the group consisting of compounds represented by general formula (ii) shown below. (In formulae, R i1 and R ii1 independently represent an alkyl group having 1 to 8 carbon atoms, and one -CH 2 - group or two or more -CH 2 - groups which are not adjacent to each other in the alkyl group may be independently substituted by -CH=CH-, -C‰¡C-, -O-, -CO-, -COO- or -OCO, and one or two or more hydrogen atoms in the alkyl group independently may be substituted by a fluorine atom or a chlorine atom; m i1 represents 0, 1 or 2; A i1 represents 1,4-phenylene group in which a hydrogen atom may be substituted by a fluorine atom or a chlorine atom, and when m i1 represents 2, A i1 may be the same or different; X i1 independently represents a hydrogen atom, a fluorine atom or a chlorine atom; m ii1 represents 0 or 1; X ii1 , X ii2 , X ii3 and X ii4 independently represent a hydrogen atom, a fluorine atom or a chlorine atom; and X ii5 represents a hydrogen atom, a fluorine atom, a chlorine atom, a cyano group, -CF 3 or -OCF 3 .)

Description

technical field [0001] The present invention relates to a nematic liquid crystal composition having a positive dielectric constant anisotropy (Δε) useful as a liquid crystal display material, and a liquid crystal display element using the nematic liquid crystal composition. Background technique [0002] Liquid crystal display devices are used in various measurement equipment represented by clocks and desktop computers, automotive panels, word processors, electronic manuals, printing machines, computers, televisions, clocks, advertising display boards, etc. Typical liquid crystal display methods include TN (Twisted Nematic) type, STN (Super Twisted Nematic) type, vertical alignment type using TFT (Thin Film Transistor), and IPS (In-Plane Switching) type. The liquid crystal compositions used in these liquid crystal display elements are required to be stable against external stimuli such as moisture, air, heat, and light, to display a liquid crystal phase over as wide a tempera...

AI Technical Summary

Problems solved by technology

If the deviation of the dropping amount becomes larger than the optimum value, the pre-designed refractive index of the liquid crystal display element and the balance of the driving electric field will collapse, and display defects such as unevenness and poor contrast will occur.

In particular, for small liquid crystal display elements, which are often used in recent smartphones, it is inherently difficult to control the deviation from the optimum value within a certain range because the optimum amount of liquid crystal to be added is a small amount.

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