ACTIVE MATRIX DISPLAY HAVING HIGH CONTRAST VALUE

• Main Authors: DUBAL HANS-ROLF DR, WINGEN RAINER, NONAKA TOSHIAKI
• Format: Patent
• Language: English
• Published: 27.03.2001
• Edition: 7
• 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; HETEROCYCLIC COMPOUNDS; 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; ORGANIC CHEMISTRY; PAINTS; PHYSICS; POLISHES; TECHNIQUES OR PROCEDURES FOR THE OPERATION THEREOF

PROBLEM TO BE SOLVED: To obtain an active matrix display containing a liquid crystal mixture that can attain a high maximum transmittance, a high contrast, and a threshold voltage constant in a wide temperature range, has an I-N*-SmC* phase sequence, a specified spontaneous polarization value in the drive temperature range, and a specified pitch at least one temperature in a nematic or cholesteric phase, and contains a plurality of specified compounds. SOLUTION: An active matrix display containing a chiral smectic liquid crystal mixture, wherein the liquid crystal mixture has an I-N*-SmC* phase sequence, a spontaneous polarization value <40n C/cm2 at the drive temperature range, and a pitch >10 μm at least one temperature in a nematic or cholesteric phase and contains at least one compound selected from each of at least two of groups I, II, and III of substances and 0.1-50 wt.%, based on the liquid crystal mixture, at least one compound selected from group IV of substances.