LIQUID CRYSTAL GUEST HOST SYSTEMS

摘要

1. Liquid-crystal guest-host system having colour properties which are independent of the mode of illumination and independent of the layer thickness and having at least two pleochroic dyestuffs, characterized in that at least one of the has an absorption maximun above 665 nm, the dyestuffs dyestuffs and their concentrations being selected such that an electro-optical display element containing the liquid-crystal guest-host system exhibits a colour separation DELTA E, measured by the CIE (1964) method, from the point of achromatism which is less than 5 units.