Oriented film, image display device using the same, and method for cutting out oriented film sheet

A rectangular oriented film with controlled retardation and axis alignment addresses blackouts and rainbow spots in image display devices, enhancing productivity and versatility by converting linearly polarized light into elliptically polarized light.

JP2026001171APending Publication Date: 2026-01-06TOYOBO CO LTD
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Patent Information

Application Number
JP2025166490
Authority / Receiving Office
JP · JP
Patent Type
Applications
Current Assignee / Owner
Filing Date
2025-10-02
Publication Date
2026-01-06

AI Technical Summary

Technical Problem

Conventional image display devices using polarized sunglasses cause blackouts and rainbow spots due to the alignment of polarizer axes, leading to inefficiencies in film production and limited versatility, especially in outdoor digital signage with large screens.

Method used

A rectangular oriented film with specific in-plane retardation and angle between its long side and slow or fast axis, which converts linearly polarized light into elliptically polarized light, reducing waste and increasing productivity while preventing blackouts and rainbow spots.

Benefits of technology

The solution provides an economically efficient oriented film that can be retrofitted to general-purpose image display devices, minimizing waste and ensuring clear visibility without blackouts or rainbow spots, even when viewed through polarized sunglasses.

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Abstract

According to the present invention, it is possible to provide an economically excellent oriented film that can reduce waste and increase productivity when a sheet piece of depolarizing film is cut out from a long-length film, does not cause blackout or rainbow spots even in a case where an image is viewed with polarized sunglasses on, and can be attached later using a general-purpose image display device as digital signage, an image display device using the same, and a method for cutting out an oriented film. In addition, in a further preferred embodiment, there can be provided an oriented film, an image display device, and a method of cutting out an oriented film, each of which causes less trouble at the time of bonding or thereafter.SOLUTION: A rectangular oriented film that is disposed on a viewing side of an image display apparatus and converts linearly polarized light emitted from the image display apparatus into elliptically polarized light, wherein the oriented film has an in-plane retardation of 3000 to 30000nm, and an angle between a long side of the oriented film and a slow or fast axis of the oriented film is more than 5 degrees and less than 30 degrees.SELECTED DRAWING: None
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