MANUFACTURE OF OPTICAL FILM, OPTICAL FILM AND LIQUID CRYSTAL DISPLAY

• Main Authors: OTSU OSAMU, MAZAKI HITOSHI, KUMAGAI YOSHIHIRO
• Format: Patent
• Language: English
• Published: 11.07.2000
• Edition: 7
• Subjects: AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING; 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; PERFORMING OPERATIONS; PHYSICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDEDFOR; SHAPING OR JOINING OF PLASTICS; TECHNIQUES OR PROCEDURES FOR THE OPERATION THEREOF; TRANSPORTING; WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE, IN GENERAL

PROBLEM TO BE SOLVED: To manufacture a biaxial optical film in which control of a refractive index distribution is easy and the uniformity in high by setting a solution of a film forming material on the base plate, forming an optically negative uniaxial film being dried and oriented in its face, and stretching this film into biaxial film. SOLUTION: An optically negative uniaxial film is formed by disposing a solution of film making material on a base plate to subsequently be dried and oriented in its face. At this time, for such a base plate, there is employed an oriented film such as a plastic film having an appropriate thickness. Also, a film thickness of the negative uniaxial film is made relatively small with respect to a thickness of the base plate. The negative uniaxial film is stretched so as to form a biaxal film. This operation is conducted such that the negative uniaxial film is heated with an stretched film as a base plate. By this process, an optical film can be manufactured which has a high uniformity, an easy control of a refractive index distribution and the high quality, and demonstrates an excellent function.