LIQUID CRYSTAL COMPOUND WITH DIBENZOCYCLOHEPTENE RING AND LIQUID CRYSTALLINE COMPOSITION COMPRISING THE SAME

• Main Authors: CHO, HYUNG SOO, CHUN, BYUNG SOON, KIM, JONG SEOB
• Format: Patent
• Language: English
• Published: 12.04.2005
• Edition: 7
• Subjects: ADHESIVES; CHEMISTRY; DYES; MATERIALS FOR MISCELLANEOUS APPLICATIONS, NOT PROVIDED FORELSEWHERE; METALLURGY; MISCELLANEOUS APPLICATIONS OF MATERIALS; MISCELLANEOUS COMPOSITIONS; NATURAL RESINS; PAINTS; POLISHES

A liquid crystal compound having a dibenzocycloheptene ring is provided to increase negative dielectric anisotropy, Tni and a response rate owing to its low viscosity, wherein the rapid response rate makes its application to a moving image or a big-sized display panel in advantageous way, accordingly to give further improved properties such as threshold voltage, voltage retention rate or stability to various electric modes of LCD, specifically vertical alignment(VA) or optically controlled. The liquid crystal compound is represented by formula 1, wherein W is a cycloheptane or cycloheptene ring; B to B8 are independently -N-, -CF-, -CH-, -CCF3-, -COCF3-, -CNCS-, -CSF5-, -CCF2H-, -CCFH2- or -CE, in which at least one of B1 to B8 is -CE, wherein E is -[Z-A]m-R, in which R is alkyl having C1-15, alkenyl or alkoxy, -H, -OCF3, -CF3, -CF2H, -CFH2-, -OCF2CF2H, -OCF2CFHCF3, -CF2CH2CF2CH3 or -CH2CF2CH2CF2CH3, A is 1,4-cyclohexylene, 1,4-phenylene, cyclohexene-1,4-diyl, 1,3-dioxane-2,5-diyl, pyridine-1,4-diyl or pyrimidine-2,5-diyl, wherein one or more hydrogen atoms in the functional groups may be substituted with halogen atoms, Z is a single bond, -O-, -OOC-, -OCF2-, -CF2O-, -COO-, -OCO-, -CH2CH2- or -CH2O-, m is an integer of 0 or 1; X is -F, -Cl, -Br, -NCS, -CN, -OCF3 or -SCF3; each of Y1 to Y5 is independently -H, -F, -Cl, -Br, -NCS-CN, -OCF3 or -SCF3.