OPTICAL MULTILAYER FILM, PROCESS FOR PRODUCING CONTINUOUS OPTICAL MULTILAYER FILM, AND LIQUID-CRYSTAL DISPLAY

• Main Authors: YOSHIMI HIROYUKI, FUTAMURA KAZUNORI, HAYASHI MASAKI, NAGASE JUNICHI
• Format: Patent
• Language: English; Korean
• Published: 10.09.2009
• 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; LAYERED PRODUCTS; LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT ORNON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM; NON-LINEAR OPTICS; OPTICAL ANALOGUE/DIGITAL CONVERTERS; OPTICAL ELEMENTS, SYSTEMS, OR APPARATUS; OPTICAL LOGIC ELEMENTS; OPTICS; PERFORMING OPERATIONS; PHYSICS; TECHNIQUES OR PROCEDURES FOR THE OPERATION THEREOF; TRANSPORTING

An optical multilayer film which comprises a polarizer and a retardation film superposed on one side of the polarizer. The polarizer comprises a stretched film made of a hydrophilic polymer containing a dichroic substance, and has an in-plane birefringence at a wavelength of 1,000 nm (nxy[1000]) of 0.01-0.03. The retardation film is a film having an index ellipsoid satisfying the relationship nx>ny>=nz. The retardation film has been disposed so that the slow-axis direction for the film is substantially perpendicular to the absorption-axis direction for the polarizer. The optical multilayer film, when used in, e.g., a liquid-crystal display, can heighten the contrast ratio of the display.