NEMATIC LIQUID CRYSTAL COMPOSITION AND LIQUID CRYSTAL DISPLAY CONTAINING THE SAME

• Main Authors: FUKUSHIMA YURIKO, TAKATSU HARUYOSHI, TAKEUCHI KIYOBUMI
• Format: Patent
• Language: English
• Published: 13.08.1996
• Edition: 6
• Subjects: ADHESIVES; CHEMISTRY; DEVICES OR ARRANGEMENTS, THE OPTICAL OPERATION OF WHICH ISMODIFIED BY CHANGING THE OPTICAL PROPERTIES OF THE MEDIUM OF THEDEVICES OR ARRANGEMENTS FOR THE CONTROL OF THE INTENSITY,COLOUR, PHASE, POLARISATION OR DIRECTION OF LIGHT, e.g.SWITCHING, GATING, MODULATING OR DEMODULATING; DYES; FREQUENCY-CHANGING; MATERIALS FOR MISCELLANEOUS APPLICATIONS, NOT PROVIDED FORELSEWHERE; METALLURGY; MISCELLANEOUS APPLICATIONS OF MATERIALS; MISCELLANEOUS COMPOSITIONS; NATURAL RESINS; NON-LINEAR OPTICS; OPTICAL ANALOGUE/DIGITAL CONVERTERS; OPTICAL LOGIC ELEMENTS; OPTICS; PAINTS; PHYSICS; POLISHES; TECHNIQUES OR PROCEDURES FOR THE OPERATION THEREOF

PURPOSE: To obtain a nematic liquid crystal composition having a high birefringent index, showing a nematic phase in a wide temperature range and having a high voltage retention and high chemical stability by using two specified compounds as the essential components. CONSTITUTION: This composition is prepared by using compounds of formulas I and II (wherein R and R are a 2-7C linear alkyl or alkenyl or a group of formula III; (p) and (q) are each 1-5; (k) is 0 or 1; X to X are each H or F, provided that at least one of X to X is F; and Y is a 2-7C linear alkyl, alkoxy, -OCF3 , -CF3 or F) (e.g. compounds of formulas IV and V) as the essential components. This composition can give a liquid display reduced in the flickering, cross-talking, etc., of the display screen. Owning to its high birefringence, the thickness of the liquid crystal layer can be reduced, which can give an improved response. It can provide good drive characteristics and display characteristics when used in especially a twisted nematic liquid crystal device of a high amount of information.