Partially fluorinated liquid crystal material
AssigneeDisplaytech, Inc.
InventorsMichael Wand, Neil Gough, Xin Hua Chen
Life of this patent
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Abstract
The invention provides LC compositions that exhibit V-shaped switching when aligned in an analog device configuration and exhibit bistability when aligned in a bookshelf-type device configuration. The invention more specifically provides LC compositions of formula 1 and particularly chiral nonracemic compounds of formula 1 which exhibit bistable switching as well as V-shaped switching when aligned in appropriate device configurations. The invention also provides methods of using the compounds of the invention in making LC compositions and electooptical devices comprising an aligned layer of the compositions of this invention.
Claims52
A liquid crystal composition comprising a compound of the formula:
- wherein:
- x is 0 or 1;
- R is CnF2n+1CmH2m,
- where
- m is an integer greater than 3and less than or equal 10;
- and
- n is an integer from 1 to 10 and m+n is less than or equal to 20;
- d is 0 or 1;
- each of A1, A2, A3, A4, B1, B2, B3, B4, C1, C2, C3, and C4 is independently CH, N, or CF, provided no more than 2 of A1, A2, A3, and A4 is N, no more than 2 of B1, B2, B3, and B4 is N, and no more than 2 of C1, C2, C3, and C4 is N;
- D is —C(═O)O—, —OC(═O)—, —CH2—CH2—, —CH═CH— or —C≡C—;
- Y is an alkyl or fluorinated alkyl group having from one to six carbon atoms;
- and
- R1 is a straight chain C2-12 alkyl, C2-12 alkenyl or C2-12 alkynyl containing at least one Si atom, where one or more non-neighboring CH2 groups can be replaced with —O—, —S—, —Si(R′)2—, —Si(R′)2—(CH2)p—Si(R′)2—, where p is an integer ranging from 1 to 6, —Si(R′)2—O—, or —Si(R′)2—O—Si(R′)2—O—, wherein each R′ is independently alkyl or fluorinated alkyl.
A compound having the formula:
- wherein:
- x is 0 or 1;
- R is CnF2n+1CmH2m
- where
- m is an integer greater than 3 and less than or equal to 10;
- and
- n is an integer from 1 to 10;
- each of A1, A2, A3, A4, B1, B2, B3, B4, C1, C2, C3, and C4 is independently CH, N, or CF, provided no more than 2 of A1, A2, A3, and A4 is N, more than 2 of B1, B2, B3, and
- B4 is N, and no more than 2 of C1, C2, C3, and C4 is N;
- d is 0 or 1;
- D is —C(═O)O—, —OC(═O)—, —CH2—CH2—, —CH═CH—or —C≡C—;
- Y is an alkyl or fluorinated alkyl group having from one to six carbon atoms;
- and
- R1 is C2-12 alkyl, C2-12 alkenyl, or C2-12 alkynyl containing at least one Si atom, where one or more non-neighboring CH2 groups can be replaced with an —O—, —S—, —Si(R′)2—, —Si(R′)2—(CH2)p—Si(R′)2—, where p is an integer ranging from 1 to 6, or —Si(R′)2—O—, —Si(R′)2—O—Si(R′)2—O—, wherein each R′ is independently alkyl or fluorinated alkyl having from one to six carbon atoms.
Dependencies are inferred from the claim text.