Ferroelectric liquid crystal (FLC) material and chiral compound
AssigneeSanma Eletron (Hong Kong) Appliance Company Limited
InventorsVALERII VLADIMIROVICH VASHCHENKO, OLENA V. VASHCHENKO, ABHISHEK KUMAR SRIVASTAVA
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Abstract
A ferroelectric liquid crystal (FLC) material in a vertically aligned liquid crystal cell, comprising at least one chiral compound and at least one non-chiral liquid crystal compound, with a sub-micron scale helix pitch less than 300 nm, spontaneous polarization greater than 100 nC/cm2, and a tilt angle greater than 38 degrees. The ferroelectric liquid crystal (FLC) material provides an extremely large Kerr constant in a vertically aligned liquid crystal cell at the communication band of the light and therefore reduces the driving voltage and response time.
Claims20
A chiral compound for ferroelectric liquid crystal (FLC) material, is of a formula:
- wherein
- n is 0 or 1;
- R1, R2, R3, and R4 each independently are 1,4-phenylene, optionally substituted with halogen or methyl at 2 or 3 positions, or pyrimidine-2,5-diyl, or pyridine-2,5-diyl, provided that at least one of rings R1 and R4 are different from unsubstituted 1,4-phenylene;
- A1 and A2 are independently a single C—C bond, O, S, or an ester functional group;
- W1 and W2 are chiral groups of shown absolute configuration selected either from a first table below:
- first table
- W1
- W2
- Or W1 and W2 are chiral groups with mirror configuration of each chiral centre shown in a second table below:
- second table
- W1
- W2
- Wherein, CpH2p+1 is alkyl group, p=2-14, and optionally where one or more CH2 are independently replaced with CF2, O, or —CO— groups provided that two O atoms are not linked together.
A chiral mixture for ferroelectric liquid crystal (FLC) material, comprising at least two chiral compounds of following formulae:
- wherein
- n is 0 or 1;
- R1, R2, R3, and R4 each independently are 1,4-phenylene, optionally substituted with halogen or methyl at 2 or 3 positions, or pyrimidine-2,5-diyl, or pyridine-2,5-diyl, provided that at least one of rings R1 and R4 are different from unsubstituted 1,4-phenylene;
- A1 and A2 are independently a single C—C bond, O, S, or an ester functional group;
- W1 and W2 are chiral groups of shown absolute configuration selected either from a first table below:
- first table:
- W1
- W2
- Or chiral groups with mirror configuration of each chiral centre shown in a second table below:
- second table:
- W1
- W2
- where CpH2p+1 is alkyl group, p=2-14, and optionally where one or more CH2 are independently replaced with CF2, O, or —CO— groups provided that two O atoms are not linked together.
A ferroelectric liquid crystal (FLC) material in a vertically aligned liquid crystal cell, comprising at least one chiral compound and at least one non-chiral liquid crystal compound, with a helix pitch less than 300 nm, a spontaneous polarization greater than 100 nC/cm2, ad a tilt angle greater than 38°.
Dependencies are inferred from the claim text.