OPTICAL ORIENTATION FILM PROVIDING HIGH ORIENTATION AND HIGH PRETILT ANGLE, AND LIQUID CRYSTAL DISPLAY ELEMENT USING THE SAME

• Main Authors: SAKAMOTO KENJI, USAMI KIYOAKI, TAMURA NORIHISA
• Format: Patent
• Language: English
• Published: 03.10.2013
• 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 LOGIC ELEMENTS; OPTICS; PHYSICS; TECHNIQUES OR PROCEDURES FOR THE OPERATION THEREOF

PROBLEM TO BE SOLVED: To provide a liquid crystal orientation film which has high liquid crystal orientation and stably provides a large pretilt angle near 45°, a method of manufacturing the orientation film, and a liquid crystal element comprising the orientation film.SOLUTION: A coated film obtained by applying amine processing to a polyamic acid having optical orientation capability is exposed to light, and then cured at or above the imidization temperature of the polyamic acid thereby to obtain a polyimide optical orientation film, which provides a pretilt angle of 3-70° to liquid crystal and an orientation index ( ) represented by a formula in Figure of 0.27 or greater.