Nematic liquid crystals for display devices

Claim 1

In a multiplexed twisted nematic liquid crystal display device, the improvement comprising as said nematic liquid crystalline composition a mixture of A. at least one nematic liquid crystalline compound of the formula ##STR86## wherein R 1 represents n-C m H 2m+1 , R 2 represents n-C q H 2q+1 -O, and m and q each represent an integer of 1 to 10; and at least one of the following components B, C and D: B. at least one colorless, chemically stable nematic liquid crystalline compound having negative dielectric anisotropy of the general formula ##STR87## m and q each represent an integer of from 1 to 10, or a homolog thereof, C. at least one colorless, chemically stable nematic liquid crystalline compound having large positive dielectric anisotropy selected from the group consisting of compounds of the general formulas ##STR88## wherein R represents n-C m H 2m+1 or n-C m H 2m+1 -O, and m represents an integer of 1 to 10; compounds of the general formula ##STR89## wherein R represents n-C m H 2m+1 , and m represents an integer of from 1 to 10, and compounds of the general formula ##STR90## wherein R represents n-C m H 2m+1 , and m represents an integer of from 1 to 10, or homologs of said compounds; and D. at least one colorless, chemically stable nematic liquid crystalline compound having small positive dielectric anisotropy selected from the group consisting of compounds of the general formulas ##STR91## wherein R represents n-C m H 2m+1 , n-C m H 2m+1 -O, or ##STR92## and m represents an integer of from 1 to 10, compounds of the general formula ##STR93## wherein R represents n-C m H 2m+1 , and m represents an integer of from 1 to 10, compounds of the general formula ##STR94## wherein R represents n-C m H 2m+1 , and m represents an integer of from 1 to 10, compounds of the general formula ##STR95## wherein R represents n-C m H 2m+1 , and m represents an integer from 1 to 8, compounds of the general formula ##STR96## wherein R represents n-C m H 2m+1 , and m represents an integer of from 1 to 10, and compounds of the general formula ##STR97## wherein R represents n-C m H 2m+1 , and m represents an integer of from 1 to 10, or homologs of said compounds; said mixtures comprising (1) about 43.3% to about 60% by weight of A, about 21.7% to about 30% by weight of B, and about 10% to about 35% by weight of C, (2) about 40% to about 90% by weight of A, 0% to about 30% by weight of B, and about 10% to about 40% by weight of D, or (3) about 23.3% to about 49% by weight of A, 0% to about 19.5% by weight of B, about 10% to about 30% by weight of C and about 10% to about 60% by weight of D.