摘要:
Einer Flüssigkristallmischung wird ein Komplexbildner für Metallionen, insbesondere für Natriumionen zugesetzt. Dieser Komplexbildner sorgt dafür, daß Natriumionen, die bei Anwendung der Flüssigkristallmischung in einer Flüssigkristallzelle aus dem Glas der Zellenplatten in die Flüssigkristallschicht eindiffundieren, komplexiert werden, so daß sie nicht zu einem Erhöhen der Leitfähigkeit der Flüssigkristallmischung führen können. Dadurch ist es nicht mehr erforderlich, Zellenplatten mit Diffusionsschutzschichten oder gar Zellenplatten aus Spezialglas zu verwenden, sondern es kann beliebiges Glas eingesetzt werden.
摘要:
Le dispositif d'affichage à cristaux liquides décrit, qui contient un milieu cristallin liquide comprenant un matériau hôte et au moins un colorant fluorescent, se caractérise en ce que le matériau hôte est constitué par au moins deux composés cristallins liquides, dont l'un présente une anisotropie diélectrique négative ou positive et l'autre une anisotropie diélectrique neutre, en ce que le mélange hôte a un coefficient d'extinction inférieur à 2 x 102 entre 300 et 400 nm et en ce que le milieu cristallin liquide comprend en outre une quantité efficace d'un agent de transfert d'énergie ayant un coefficient d'extinction d'au moins 104 entre 300 et 400 nm, une solubilité dans le milieu cristallin liquide d'au moins 0,1 % et un rendement quantique de fluorescence d'au moins 0,2.
摘要:
A squarilium compound represented by the following formula (I) and a liquid crystal composition containing the same are disclosed: wherein X and Y each represents
wherein R 1 represents a hydrogen atom, an alkyl group, a substituted or unsibstituted aryl group or a substituted or unsubstituted aralkyl group; R 2 , R 3 and R 4 each represents a hydrogen atom, an alkyl group or a substituted or unsubstituted alkoxy group; R 5 represents a hydrogen atom, an alkyl group, an aralkyl group or an aryl group; ring A represents a cyclic alkylene; ring B represents a substituted or unsubstituted aromatic ring; and ring C represents a heterocyclic ring containing one or two of a nitrogen atom, an oxygen atom and a sulfur atom; with proviso that X and Y are not the same when either one of them represents
or and a liquid crystal composition containing the squarilium compound of the formula (I). The squarilium compound (I) are soluble in a wide variety of solvents and resistant to light, and their maximum absorption wavelengths in these solvents are in the ranges of from 700 to 900 nm.
摘要:
A process for producing a liquid-crystal cell by using a ferroelectric liquid crystal (FLC) composition containing at least one substance that exhibits liquid crystallinity and at least one additive having lower boiling point than said substance, characterized in that said FLC composition is charged into the cell under high-temperature and high-vacuum conditions, provided that the two conditions will not overlap, or will overlap for a sufficiently short time to effectively prevent the evaporation of said additive is disclosed.
摘要:
A ferroelectric liquid crystal mixture containing two or more components, at least one of which is a complex ligand for ions, in particular for cations, is particularly suitable for use in ferroelectric liquid crystal displays.
摘要:
A liquid crystal composition for a liquid crystal display device of supertwisted nematic mode characterized in that it comprises at least one compound selected from the group consisting of condensed heterocyclic compounds, aromatic amine compounds, aliphatic amine compounds and aromatic hydroxy compounds. Liquid crystal display devices having high quality that no irregular display caused by dust and fusion phenomena are observed can be provided by using the liquid crystal compositions by controlling to scarcely lower the specific resistance value and to lower the voltage-holding ratio.
摘要:
Le procédé décrit, qui sert à produire une cellule à cristaux liquides en utilisant une compostion de cristaux liquides ferroélectiques (FLC) contenant au moins une substance présentant un caractère cristallin liquide et au moins un additif ayant un point d'ébullition inférieur à celui de ladite substance, se caractérise en ce que la compostion de FLC est chargée dans la cellule dans des conditions de température élevée et de vide poussé, étant entendu que les deux conditions ne se chevauchent pas ou alors se chevauchent pendant une période suffisamment courte pour empêcher efficacement l'évaporation de l'additif.
摘要:
Novel semi-conducting liquid crystalline materials comprise the radical salt of a mesogen. Preferred mesogens are those which form a discotic liquid crystalline phase. The materials may be produced by heating the mesogen in the isotropic phase with a dopant which is an oxidising agent or a reducing agent. The preferred materials exhibit anisotropic conduction properties in the liquid crystalline and the solid phases. The materials are useful in a variety of electronic and opto-electronic devices.
摘要:
A liquid crystal composition comprising a liquid crystal compound and at least one cyclic ether compound such as crown ether, azacrown, silacrown, cryptand, etc., and a liquid crystal element comprising said composition sandwiched in between two base plates at least one of which is provided with a transparent electrode. The invention is directed to providing a liquid crystal element undergoing less electrostatic hazards and a stable liquid crystal composition having a low resistivity for substantiating such an element.