OPTICAL COMPENSATION ELEMENT

• Main Author: TOYOOKA TAKEHIRO
• Format: Patent
• Language: English
• Published: 16.02.2001
• Edition: 7
• Subjects: 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; FREQUENCY-CHANGING; NON-LINEAR OPTICS; OPTICAL ANALOGUE/DIGITAL CONVERTERS; OPTICAL ELEMENTS, SYSTEMS, OR APPARATUS; OPTICAL LOGIC ELEMENTS; OPTICS; PHYSICS; TECHNIQUES OR PROCEDURES FOR THE OPERATION THEREOF

PROBLEM TO BE SOLVED: To decrease asymmetric properties when a medium tone is displayed to realize high-quality image display by constituting a photosetting type low mol.wt. liquid crystal showing optically positive uniaxial properties of a low mol.wt. liquid crystal film produced by fixing the twisted nematic alignment formed in the liquid crystal state by a photosetting reaction and a film showing optically negative anisotropy. SOLUTION: The element consists of the combination of a low mol.wt. liquid crystal film in which the twisted nematic alignment is stably maintained and a film showing optically negative anisotropy. The low mol.wt. liquid crystal film is prepared from a liquid crystal material essentially consisting of a low mol.wt. liquid crystal showing optically positive uniaxial properties. As for the photosetting type low mol.wt. liquid crystal showing optically positive uniaxial properties, a liquid crystal having biphenyl derivatives, phenylbenzoate derivatives, stilbene derivatives or the like as the basic structure can be used. As for the low mol.wt. liquid crystal, a liquid crystal showing thermotropic properties is preferable from the viewpoint of the film forming process.