Viewing angle expansion film, polarizing plate, liquid crystal display device, and method for manufacturing viewing angle expansion film

• Main Author: NISHIOKA, HIROYA
• Format: Patent
• Language: Chinese; English
• Published: 01.02.2021
• 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

A viewing angle expansion film for expanding the viewing angle, wherein the viewing angle expansion film is equipped with a plurality of hole-containing parts, the hole-containing parts contain holes, and the depth of the hole-containing parts is from 0.5 [mu]m to 2.0 [mu]m; a polarizing plate equipped with the viewing angle expansion film and a polarizer; a liquid crystal display device equipped with the polarizing plate; and a method for producing a viewing angle expansion film that includes a step 1 for preparing a hole-containing material film having hole-containing parts and a step 2 for stretching the hole-containing material film and changing the shape of the holes in the hole-containing parts of the hole-containing material film.