Method for manufacturing optical film, optical compensation film for optical film, polarization plate, and liquid crystal display panel, and liquid crystal display apparatus

Abstract

The invention provides a optical film, which has a sufficiently large tilt structure, good facial shape and optical characteristics.The present invention also provides a manufacturing method of optical film, which is included in the first crushing surface of the compression device and between the second crushing surface to make the melt with a composition containing the thermoplastic resin passes through and continuously press the formation.The thin film -like process, where the movement speed of the first crushing surface is faster than the movement speed of the second crushing surface, andThe pressure is controlled above 20MPa, and the film is controlled by the clipstick of the film by the first compressive surface and the second crushing surface of the second crushing surface of the film.The second crushing surface is driven by the driver motor connected by the planetary reducer.

Description

technical field [0001] The invention relates to a method for manufacturing an optical film. In addition, it also relates to an optical film produced by the production method, a polarizing plate having the optical film, a compensation film for a liquid crystal display panel, and a liquid crystal display device. Background technique [0002] As the liquid crystal display market flourishes in recent years, various films have been developed. For example, Patent Documents 1 to 3 disclose a tilt type retardation film. [0003] For example, Patent Document 1 describes a method of producing a film with an inclined optical axis by passing a film between two rollers having different peripheral speeds and applying a shear force to the film, and its application to a TN-type liquid crystal display. However, the method described in this document has problems such as a large difference in the optical properties of the thin film and easy contact damage to the surface of the thin film. To ...

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Problems solved by technology

This situation is also the same when two rolls with different peripheral speeds are used to produce optical films (for example, refer to Patent Documents 2, 3, and 5). The actual situation is that there is no detailed description of the speed reducer used in the motor that drives the two rolls. Research

In particular, when producing a film using two rollers with different peripheral speeds, in addition to the above cases, a worm gear reducer is very compact in size, and it is very preferable to use it from the viewpoint of being able to handle high torque, but no attempt has been made to use a planetary reducer

That is, none of the patent documents disclose the use of a planetary speed reducer for the motors driving the two rolls for the touch rolls of the fusion film forming method.

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