Optical film, polarizing plate, method for producing optical film, method for producing polarizing plate, image display device, and image display system
AssigneeFUJIFILM Corporation
InventorShigeaki Nimura
Life of this patent
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Abstract
An optical film formed of a cellulose acylate and having a first region and a second region that differ from each other in the birefringence, wherein the angle between the slow axis of the first region and the slow axis of the second region is at least 45 degrees can be produced at a low cost and used for 3D stereoscopic image display.
Claims28
An optical film formed of a cellulose acylate and having a first region and a second region that differ from each other in the birefringence, wherein the angle between the slow axis of the first region and the slow axis of the second region is at least 45 degrees.
A method for producing an optical film, comprising:
- stretching the entire film containing a cellulose acylate in a specific direction and
- heating a partial region of the stretched film in such a manner that the slow axis formed by the stretching in the partial region could rotate by at least 45 degrees.
An optical film produced by:
- stretching the entire film containing a cellulose acylate in a specific direction and
- heating a partial region of the stretched film in such a manner that the slow axis formed by the stretching in the partial region could rotate by at least 45 degrees.
A polarizer laminated with an optical film formed of a cellulose acylate and having a first region and a second region that differ from each other in the birefringence, wherein the angle between the slow axis of the first region and the slow axis of the second region is at least 45 degrees.
An image display panel including an optical film formed of a cellulose acylate and having a first region and a second region that differ from each other in the birefringence, wherein the angle between the slow axis of the first region and the slow axis of the second region is at least 45 degrees.
An image display system including an optical film formed of a cellulose acylate and having a first region and a second region that differ from each other in the birefringence, wherein the angle between the slow axis of the first region and the slow axis of the second region is at least 45 degrees.
A method for producing a polarizer, comprising:
- stretching the entire film containing a cellulose acylate in a direction oblique to the film traveling direction by about 45 degrees,
- heating the stretched film in such a manner that the slow axis formed by the stretching could rotate by at least 45 degrees relative to the stripe region of a part of the stretched film of which the long side is in the film conveying direction, thereby forming at least two regions of a first stripe region which has been heated such that the slow axis therein formed by stretching is rotated by at least 45 degrees and a second stripe region which has not been heated such that the slow axis therein formed by stretching is rotated by at least 45 degrees, and
- laminating the resulting optical film on a long polarizer of which the transmission axis is at the width direction thereof, in a mode of roll-to-roll lamination.
Dependencies are inferred from the claim text.