Liquid crystal compounds, mixtures and devices
AssigneeThe Secretary of State for in Defence in Her Brittanic Majesty's Government of the United Kingdom of Great Britain and Northern Ireland
InventorsAndrew John Slaney, Damien Gerard McDonnell, Amarjit Kaur Samra, Maurice Stanley, Victoria Minter, John William Goodby, Michael Hird, Simon John Cross, Chu Chuan Dong
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Abstract
An electroclinic device having two spaced cell walls each bearing electrode structures and treated on at least one facing surface with an alignment layer, a layer of a smectic liquid crystal material enclosed between the cell walls, where the liquid crystal material contains one or more of the compounds described by formula I as defined in the specification.
Claims2
A compound of the formula:
- wherein
- X is CF3, CF2H, CFH2, hydrogen, alkyl or alkoxy;
- X2 is CF3, CF2H, CFH2, hydrogen, alkyl or alkoxy;
- X3 is CF3, CF2H, CFH2, hydrogen, alkyl or alkoxy;
- X4 is CF3, CF2H, CFH2, hydrogen, alkyl or alkoxy;
- A and B are independently phenyl, mono-fluorinated phenyl, di-fluorinated phenyl or cyclohexyl;
- Y groups are independently selected from a single bond and C≡C;
- provided that at least one of the Y groups is a single bond;
- q is 0 or 1;
- R1 is an end group of the following Formula II:
- wherein Z is (CH2)nO where n is 0, 1 or 2;
- J and M are independently selected from H, C1-4 alkyl;
- W is C1-C12 straight or branched alkyl chain;
- provided J, M, W are different;
- that R2 contains 1-14 carbon atoms wherein one or more non-adjacent CH2 groups may be replaced by O;
- and further provided that at least one of X or X2 is CF3, CF2H or CFH2.
Dependencies are inferred from the claim text.