- LIQUID CRYSTAL COMPOSITION AND LIQUID CRYSTAL DISPLAY INCLUDING THE SAME
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A liquid crystal composition includes at least one liquid crystal molecule having a positive dielectric anisotropy represented by Chemical Formula 1: In Chemical Formula 1, each of A and B is independently 1, 4-cyclohexylene or 1, 4-phenylene, C is cyclopentyl or cyclopentadienyl, each of Z1 and Z2 is independently a single bond, alkylene group, carbonyloxy, —CF2O—, —OCF2—, —CH2O—, or —OCH2—, each of L1 to L8 is independently —H, —F, —CF3, or may be difluoride (diF) when A or B is 1, 4-cyclohexylene, each of L9 to L12 is independently —H, —F, —CF3, or difluoride, each of m and n is 0 to 2, and R1 is an alkyl group or an alkoxy group, and the number of carbons of R1 is about 1 to about 10.
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- Highly birefringent nematic liquid crystals for reflective STN applications
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An important parameter of any LCD containing portable electronic device is a low power requirement. The reflective STN display mode offers a moderate to high information content display with low power consumption. One method to realise colour in this mode is to use a large retardation (dΔn) value in the cell. For a cell gap of 6 μm, and a retardation of ~1.5, a birefringence (Δn) of greater than +0.2 is necessary. To achieve such a value in an STN LC mixture, materials with broad nematic range, good solubility and a Δn value of +0.25 are required. A study of the trans-cyclohexyldifluorophenyltolane core structure was made and a large number of dialkyl, alkenyl-alkyl and alkoxy materials were synthesised and characterised. These materials possess low to moderate melting points, broad purely nematic mesophases, a high An and very good solubility in nematic LC hosts. They are suitable materials for inclusion in mixtures for colour reflective STN displays.
- Goulding, Mark,Reiffenrath, Volker,Hirschmann, Harald
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p. 899 - 910
(2007/10/03)
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- New nematics incorporating a 2,6-difluorophenyl acetylene group
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A large series of thin film transistor compatible nematic liquid crystals incorporating a 2,6-difluorophenyl acetylene group have been synthesised. Most of them exhibit high clearing points and an increased dielectric anisotropy.
- Buchecker,Marck,Schadt
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