Acryl-base polymer film, optical compensation film, and liquid-crystal display device having the same

• Main Authors: KAIHOKO HIROYUKI, TAKEGAMI RYUTA, NOMURA TATSUHO
• Format: Patent
• Language: English
• Published: 18.02.2014
• 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

The invention relates to an optical compensation film for IPS or FFS-mode liquid crystal display devices, having the tilt angle beta[°] not equal to zero, beta[°] being defined as phi giving the minimum value of retardation R[phi] which is retardation measured for incident light coming in a direction tilted by phi° from a normal line relative to the film-plane, the direction being in a plane including the direction perpendicular to the in-plane slow axis thereof and the normal line; and having retardation along the thickness direction at a wavelength of 550 nm, Rth(550), not equal to zero.