Liquid crystal display element

Claim 2

A liquid crystal display element utilizing dynamic scattering effect comprising: a pair of electrode base plates defining a space therebetween, at least one of which is transparent; and a liquid crystal material filled in said space having a birefringence of 0.14 to 0.21 and consisting of a mixture of a first component comprising at least one liquid crystal having relatively small birefringence and a second component comprising at least one liquid crystal having relatively great birefringence.

Claim 3

An element according to claim 1, wherein an agent for increasing electrical conductivity is added to the liquid crystal material.

Claim 4

An element according to claim 2, wherein the agent for increasing electrical conductivity is a charge-transfer complex having, as an acceptor, tetracyanoquinodimethane, tetracyanoethylene, 2,3-dichloro-5,6-dicyanoquinone, or a mixture thereof; and having, as a donor, di-n-butylferrocene.

Claim 5

An element according to claim 3, wherein the complex is present in an amount of 0.1 to 5% by weight based on the liquid crystal.

Claim 6

An element according to claim 1, wherein the first component is selected from the group consisting of cyclohexanecarboxylic acid ester type liquid crystals, phenylcyclohexane type liquid crystals, phenyl benzoate type liquid crystals, biphenylcyclohexane type liquid crystals, and cyclohexylcyclohexane type liquid crystals.

Claim 7

An element according to claim 1 or 5, wherein the second component is selected from the group consisting of azoxy type liquid crystals and Schiff base type liquid crystals.

Claim 8

An element according to claim 1, wherein t.e liquid crystal material is a mixture of p-methoxybenzylidene-p-n-butylaniline and 4-trans-butylcyclohexanecarboxylic acid-4'-hexyloxyphenyl ester; a mixture of 4-trans-propylcyclohexanecarboxylic acid-4'-ethoxyphenyl ester, 4-trans-pentylcyclohexane- carboxylic acid-4'-pentoxyphenyl ester, 4-trans-butylcyclohexanecarboxylic acid-4'-hexylphenyl ester and 4-methoxybenzylidene-4'-butylaniline; a mixture of trans-4-propyl-(4-butoxyphenyl)-cyclohexane, trans-4-pentyl-(4'-ethylbiphenyl)-cyclohexane, 4-pentylphenyl-4-methoxybenzoate, 2-cyano-4-heptylphenyl-4'-pentyl-4-biphenylcarboxylate and 4-methoxybenzylidene-4'-butylaniline; a mixture of 4-trans-alkylcyclohexane- carboxylic acid-4'-alkoxyphenyl esters, 4-hexanoyloxy-(4'-propylpheriyl)benzoate, 4-hexanoyloxy-(4'-pentylphenyl)benzoate, 4-methoxybenzylidene-4'-butylaniline and 4-ethoxybenzylidene-4'-butylaniline; a mixture of 4-trans-propylcyclohexanecarboxylic acid-4'-ethoxyphenyl ester, 4-trans-pentylcyclohexane- carboxylic acid-4'-pentyloxyphenyl ester, 4-trans-butylcyclohexanecarboxylic acid-4'-hexylphenyl ester, 4-methoxy-4'-ethylazoxybenzene and 4-methoxy-4'-butylazoxybenzene; or a mixture of butyric acid-4- trans-(4-propyl)cyclohexyl-phenyl ester, 4-trans-(4-ethyl)cyclohexyl-benzoic acid-trans-4-propylcyclohexyl ester, 4-trans-(4-butyl)cyclohexyl-benzoic acid- trans-4-propylcyclohexyl ester and 4-methoxy-4'-butylazoxybenzene.