Optical compensation film, viewing angle compensation integral type polarizing plate, and liquid crystal display device

• Main Authors: UMEDA, HIROKI, YAJIMA, TAKATOSHI, TASAKA, KOJI, KUZUHARA, NORIYASU
• Format: Patent
• Language: Chinese; English
• Published: 01.11.2004
• Subjects: ADHESIVES; CHEMISTRY; 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; DYES; FREQUENCY-CHANGING; MATERIALS FOR MISCELLANEOUS APPLICATIONS, NOT PROVIDED FORELSEWHERE; METALLURGY; MISCELLANEOUS APPLICATIONS OF MATERIALS; MISCELLANEOUS COMPOSITIONS; NATURAL RESINS; NON-LINEAR OPTICS; OPTICAL ANALOGUE/DIGITAL CONVERTERS; OPTICAL ELEMENTS, SYSTEMS, OR APPARATUS; OPTICAL LOGIC ELEMENTS; OPTICS; PAINTS; PHYSICS; POLISHES; TECHNIQUES OR PROCEDURES FOR THE OPERATION THEREOF

This invention is to provide a substrate for an optical compensation film capable of improving the durability of a viewing angle compensation function, and to provide an optical compensation film, a viewing angle compensation integrated type polarizer and a liquid crystal display device. In this substrate for an optical compensation film, photoelastic coefficients C(md), C(td) in the longitudinal and lateral directions of a cellulose film are 1x10-9 to 1x10-13Pa-1, and C(md)<C(td); a dimensional variation ratios S(md), S(td) before and after 50 hour-treatment at 80 DEG C, 90% RH in each direction are -1 to 1% and |S(md)| > |S(td)| , and R0 of following equation (I) is 20 to 70 nm and Rt of following equation (II) is 70 to 400 nm: (I) R0=(nx-ny)*d, (II) Rt=((nx+ny)/2-nz)*d.