Liquid crystal composition

Claim 2

A liquid crystal composition comprising at least one compound of each of formulas (1) and (2), and at least one of the compounds of formulas (3) and (6): ##STR11## where R 1 is a straight-chain alkyl group having 2 to 6 atoms; R 2 is a straight-chain alkyl group having 1 to 6 carbon atoms; R 3 is a straight-chain alkyl group having 3 to 6 carbon atoms; R 4 is a straight-chain alkyl group having 1 to 5 carbon atoms; R 5 is a straight-chain alkyl group having 2 to 8 carbon atoms, and R 9 is a straight-chain alkyl group having 2 to 8 carbon atoms, and including about 40 to 65 weight percent of compounds of formula (1), about 20 to 30 weight percent of compounds of formula (2), and when present about 7 to 20 weight percent of compounds of formula (3) and when present about 7 to 20 weight percent of compounds of formula (6).

Claim 3

A liquid crystal composition as described in claim 1, wherein said compounds of formula (1) comprise compounds wherein said groups R 1 and R 2 have a total of eight to ten carbon atoms.

Claim 4

A liquid crystal composition as described in claim 1, further comprising at least one of the compounds of formulas (4) and (5): ##STR12## where R 6 is a straight-chain alkyl group having 2 to 4 carbon atoms; R 7 is a straight-chain alkyl group having 3 to 5 carbon atoms; and R 8 is a straight chain alkyl group having 2 to 7 carbon atoms, and when present about 3 to 12 weight percent of compounds of formula (4) and when present about 5 to 15 weight percent of compounds of formula (5).

Claim 5

A liquid crystal composition as described in claim 3, wherein said compounds of formula (1) comprise compounds wherein said groups R 1 and R 2 have a total of eight to ten carbon atoms.

Claim 6

A liquid crystal composition as described in claim 2, wherein from about 34 to about 100 weight percent of compounds of formula (1) are those wherein said groups R 1 and R 2 have a total of eight to ten carbon atoms.

Claim 7

A liquid crystal composition as described in claim 2, wherein R 1 of the compound of formula (1) is selected from the group consisting of C 3 H 7 ; C 4 H 9 ; C 5 H 11 and C 6 H 13 .

Claim 8

A liquid crystal composition as described in claim 6, wherein R 2 of the compound of formula (1) is selected from the group consisting of C 5 H 11 ; C 6 H 13 and C 2 H 5 .

Claim 9

A liquid crystal composition as described in claim 2, wherein R 3 of the compound of formula (2) is C 5 H 11 .

Claim 10

A liquid crystal composition as described in claim 2, wherein R 4 of the compound of formula (2) is selected from the group consisting of C 3 H 7 and C 5 H 11 .

Claim 11

A liquid crystal composition as described in claim 6, wherein R 5 of the compound of formula (3) is selected from the group consisting of C 2 H 5 ; C 3 H 7 and C 4 H 9 .

Claim 12

A liquid crystal composition as described in claim 8, wherein R 9 of the compound of formula (6) is selected from the group consisting of C 2 H 5 and C 4 H 9 .

Claim 13

A liquid crystal composition as described in claim 3, comprising about 58 weight percent of compounds of formula (1), about 28 weight percent of compounds of formula (2), about 10.5 weight percent of compounds of formula (3), and about 3.5 weight percent of compounds of formula (4).

Claim 14

A liquid crystal composition as described in claim 3, comprising about 51.0 weight percent of compounds of formula (1), about 22.0 weight percent of compounds of formula (2), about 17.0 weight percent of compounds of formula (3), and about 10.0 weight percent of compounds of formula (4).

Claim 15

A liquid crystal composition as described in claim 3, comprising about 45.0 weight percent of compounds of formula (1), about 22.0 weight percent of compounds of formula (2), about 17.0 weight percent of compounds of formula (3), about 8.0 weight percent of compounds of formula (4), and about 8.0 weight percent of compounds of formula (5).

Claim 16

A liquid crystal display device adapted for time-sharing operation with a duty ratio of about 1/32 at a voltage of about 10 V or below at room temperature, including a liquid crystal composition as described in claim 1.

Claim 17

A liquid crystal display device adapted for time-sharing operation with a duty ratio in the range of about 1/32 to 1/48, including a liquid crystal composition as described in claim 1.

Claim 18

A liquid crystal display device adapted for time-sharing operation with a duty ratio down to about 1/32 at a voltage of about 10 V or below at room temperature, including a liquid crystal composition as described in claim 2.

Claim 19

A liquid crystal display device adapted for time-sharing operation with a duty ratio in the range of about 1/32 to 1/48, including a liquid crystal composition as described in claim 2.

Claim 20

A liquid crystal display device adapted for time-sharing operation with a duty ratio down to about 1/32 at a voltage of about 10 V or below at room temperature, including a liquid crystal composition as described in claim 3.

Claim 21

A liquid crystal display device adapted for time-sharing operation with a duty ratio in the range of about 1/32 to 1/48, including a liquid crystal composition as described in claim 3.

Claim 22

A liquid crystal display device comprising two opposed substantially parallel substrates with liquid crystal electrodes selectively disposed on the interior surface thereof, a liquid crystal composition in the space between the substrates, time-sharing circuit means for generating time-sharing signals to be selectively applied to the liquid crystal electrodes for operating a liquid crystal display in a time-sharing mode, the liquid crystal composition comprising at least one compound of each of formula (1) and (2), and at least one of the compounds of formulas (3) and (6): ##STR13## wherein R 1 is a straight-chain alkyl group having 2 to 6 carbon atoms; R 2 is a straight-chain alkyl group having 1 to 6 carbon atoms; R 3 is a straight-chain alkyl group having 3 to 6 carbon atoms; R 4 is a straight-chain alkyl group having 1 to 5 carbon atoms; R 5 is a straight-chain alkyl group having 2 to 8 carbon atoms, and R 9 is a straight-chain alkyl group having 2 to 8 carbon atoms, and including about 40 to 65 weight percent of compounds of formula (1), about 20 to 30 weight percent of compounds of formula (2), and when present about 7 to 20 weight percent of compounds of formula (3) and when present about 7 to 20 weight percent of compounds of formula (6).

Claim 23

A liquid crystal display device comprising two opposed substantially parallel substrates with liquid crystal electrodes selectively disposed on the interior surface thereof, a liquid crystal composition in the space between the substrates, time-sharing circuit means for generating time-sharing signals to be selectively applied to the liquid crystal electrodes for operating a liquid crystal display in a time-sharing mode, the liquid crystal composition comprising at least one compound of each of formula (1) and (2), and at least one of the compounds of formulas (3) and (6): ##STR13## wherein R 1 is a straight-chain alkyl group having 2 to 6 carbon atoms; R 2 is a straight-chain alkyl group having 1 to 6 carbon atoms; R 3 is a straight-chain alkyl group having 3 to 6 carbon atoms; R 4 is a straight-chain alkyl group having 1 to 5 carbon atoms; R 5 is a straight-chain alkyl group having 2 to 8 carbon atoms, and R 9 is a straight-chain alkyl group having 2 to 8 carbon atoms, and including about 40 to 65 weight percent of compounds of formula (1), about 20 to 30 weight percent of compounds of formula (2), and when present about 7 to 20 weight percent of compounds of formula (3) and when present about 7 to 20 weight percent of compounds of formula (6).

Claim 24

A liquid crystal display device as set forth in claim 21, wherein said formula (1) compounds are those in which said groups R 1 and R 2 have a total of eight to ten carbon atoms.

Claim 25

A liquid crystal display device as set forth in claim 21, further containing at least one of the compounds represented by formulas (4) and (5): ##STR14## wherein R 6 is a straight-chain alkyl group having 2 to 4 carbon atoms; R 7 is a straight-chain alkyl group having 3 to 5 carbon atoms; and R 8 is a straight-chain alkyl group having 2 to 7 carbon atoms, and when present about 3 to 12 weight percent of compounds of formula (4) and when present about 5 to 15 weight percent of compounds of formula (5).

Claim 26

A liquid crystal display device as set forth in claim 21, wherein said time-sharing circuit means operates with a duty ratio down to about 1/32 at a voltage of about 10 V or below at room temperature.

Claim 27

A liquid crystal display device as set forth in claim 21, wherein said time-sharing circuit means operates with a duty ratio in the range of about 1/32 to 1/48.