Liquid crystal composition and liquid crystal shutter
AssigneeSharp Kabushiki Kaisha
InventorsJohn Clifford Jones, Andrew John Slaney
Life of this patent
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Abstract
A liquid crystal composition comprising (1) an achiral host mixture comprising (a) at least 20% by weight, based on the total weight of the host mixture, of a mixture of fluorinated phenylpyrimidine compounds capable of exhibiting an SmC phase, and (b) at least 10% by weight, based on the total weight of the host mixture, of at least one fluorinated terphenyl compound which enhances the phase sequence of said mixture, wherein the total amount of (a) and (b) is at least 50% by weight based on the total weight of the host mixture; and (2) at least one chiral dopant in an amount of not more than 10% by weight of the total weight of the composition.
Claims23
A liquid crystal composition comprising:
- (1) an achiral host mixture comprising:
- (a) at least 20% by weight, based on the total weight of the host mixture, of at least two difluorinated phenylpyrimidine (diFPYP) compounds capable of exhibiting an SmC phase, wherein the at least two difluorinated phenylpyrimidine compounds are of the general formula shown below:
- wherein X1 and X2 are independently selected from the group consisting of (C1-C12)alkyl and (C1-C12)alkoxy, and m is equal to 2, and
- (b) at least 10% by weight, based on the total weight of the host mixture, of at least one fluorinated terphenyl compound which is selected from the group consisting of difluorinated terphenyl compounds and trifluorinated terphenyl compounds and which enhances the phase of said mixture, wherein the total amount of (a) and (b) is at least 50% by weight based on the total weight of the host mixture, wherein component (b) is selected from difluorinated terphenyl compounds and trifluorinated terphenyl compounds represented by the general formula shown below:
- where X1 and X2 are independently selected from the group consisting of (C1-C12)alkyl and (C1-C12)alkoxy, and x is equal to 0, 1, 2, or 3, y is equal to 0, 1, 2, or 3, and z is equal to 0, 1, 2, or 3 with the proviso that the total of (x+y+z) is equal to 2 or 3;
- and
- (2) at least one chiral dopant in an amount of not more than 10% by weight of the total weight of the composition.
A liquid crystal composition comprising:
- (1) an achiral host mixture comprising:
- (a) at least 20% by weight, based on the total weight of the host mixture, of at least two difluorinated phenylpyrimidine (diFPYP) compounds capable of exhibiting an SmC phase, wherein the at least two compounds are of the general formula [I]:
- wherein X1 and X2 are independently selected from the group consisting of (C1-C12)alkyl and (C1-C12)alkoxy, and
- (b) at least 10% by weight, based on the total weight of the host mixture, of at least one fluorinated terphenyl compound which is selected from the group consisting of difluorinated terphenyl compounds and trifluorinated terphenyl compounds and which enhances the phase of said mixture, wherein the total amount of (a) and (b) is at least 50% by weight based on the total weight of the host mixture, and wherein the at least one fluorinated terphenyl compound is selected from the group consisting of fluorinated terphenyl compounds having the general formula [II], fluorinated terphenyl compounds having the general formula [III], fluorinated terphenyl compounds having the general formula [IV] and fluorinated terphenyl compounds having the general formula [V]:
- wherein X1 and X2 are independently selected from the group consisting of (C1-C12)alkyl and (C1-C12)alkoxy;
- and
- (2) at least one chiral dopant in an amount of not more than 10% by weight of the total weight of the composition.
A liquid crystal shutter comprising a pair of mutually spaced substrate upon which are provided respective opposed alignment surfaces which are spaced apart, a layer of liquid crystal composition filling the space between the alignment surfaces, and electrodes to enable a switching voltage to be applied to the liquid crystal layer, wherein said liquid crystal composition comprises:
- (1) an achiral host mixture comprising:
- (a) at least 20% by weight, based on the total weight of the host mixture, of at least two difluorinated phenylpyrimidine (diFPYP) compounds capable of exhibiting an SmC phase, wherein the at least two difluorinated phenylpyrimidine compounds are of the general formula shown below:
- wherein X1 and X2 are independently selected from the group consisting of (C1-C12)alkyl and (C1-C12)alkoxy, and m is equal to 2, and
- (b) at least 10% by weight, based on the total weight of the host mixture, of at least one fluorinated terphenyl compound which is selected from the group consisting of difluorinated terphenyl compounds and trifluorinated terphenyl compounds and which enhances the phase of said mixture, wherein the total amount of (a) and (b) is at least 50% by weight based on the total weight of the host mixture, wherein component (b) is selected from difluorinated terphenyl compounds and trifluorinated terphenyl compounds represented by the general formula shown below:
- where X1 and X2 are independently selected from the group consisting of (C1-C12)alkyl and (C1-C12)alkoxy, and x is equal to 0, 1, 2, or 3, y is equal to 0, 1, 2, or 3, and z is equal to 0, 1, 2, or 3 with the proviso that the total of (x+y+z) is equal to 2 or 3;
- and
- (2) at least one chiral dopant in an amount of not more than 10% by weight of the total weight of the composition.
Dependencies are inferred from the claim text.