a liquid crystal composition comprising at least one of substituted bipheny - type and substituted terphenyl - type liquid crystal substances and at least one of substituted phenyl benzoate - type and substituted phenyl thiobenzoate - type liquid crystal substances , the composition further containing at least one substituted cyclohexyl benzene - type liquid crystal substance when desired . the composition has the characteristics of being wide in mesomorphic range , low in threshold voltage , satisfactory in orientation , quick - responsive , highly reliable and capable of exhibiting fully satisfactory performance when driven by a single compact power cell coupled directly thereto . the composition is useful for field effect mode liquid crystal display devices .