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Optical laminate, image display device, and method for producing an optical laminate

A technology for an optical laminate and a manufacturing method, which is applied to chemical instruments and methods, optics, identification devices, etc., can solve problems such as reduced visual confirmation, and achieve the effect of improving visual confirmation.

Active Publication Date: 2021-09-17
NITTO DENKO CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0007] However, in the conventional image display device described above, there is a problem that when the display screen is viewed while wearing polarized sunglasses, changes in hue and transmittance according to the angle of the polarized sunglasses occur, resulting in a decrease in visibility.

Method used

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  • Optical laminate, image display device, and method for producing an optical laminate
  • Optical laminate, image display device, and method for producing an optical laminate
  • Optical laminate, image display device, and method for producing an optical laminate

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Embodiment 1

[0165] 1. Production of the retardation film A constituting the first retardation layer

[0166] An acrylic adhesive was interposed between both sides of a cycloolefin-based resin obtained by hydrogenating a ring-opening polymer of a norbornene-based monomer (manufactured by Zeon Corporation, trade name "ZEONOR ZF14", thickness: 40 μm) The layer (thickness: 15 μm) was bonded to a biaxially oriented polypropylene film (manufactured by Toray Co., Ltd., trade name “Torayfan high shrinkage type”, thickness: 60 μm). Then, the longitudinal direction of the film was maintained by a roll stretcher, and the film was stretched to 1.40 times in an air circulation drying oven at 148°C±1°C. The stretched film obtained in this way was used as retardation film A. The retardation film A has a thickness of 35 μm, an in-plane retardation Re(550) of 110 nm, Re(450) / Re(550) of 1.00, and Re(650) / Re(550) of 1.00. The refractive index ellipsoid satisfies In the relationship of nx=nz>ny, the angle ...

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Abstract

The present invention provides an optical laminate capable of improving visibility by suppressing a change in hue according to the angle of polarized sunglasses. In the optical layered body, a second retardation layer, a polarizer, and a third retardation layer are laminated in this order from the visual inspection side.

Description

technical field [0001] The present invention relates to an optical laminate, an image display device, and a method for producing the optical laminate. Background technique [0002] There is known an image display using a quarter-wave plate on a touch sensor substrate or a protective substrate for a polarizing plate on the side of the visual inspection in order to improve the visibility of the display screen of an image display device while wearing polarized sunglasses. device (Patent Document 1). The image display device of Patent Document 1 has a quarter plate on the visual confirmation side of the polarizing plate on the visual confirmation side, and the angle formed by the absorption axis of the polarizing plate on the visual confirmation side and the slow axis of the quarter wavelength plate is set is 45°. As a result, circularly polarized light is emitted from the display screen, and as a result, it is possible to eliminate the occurrence of darkening of the display s...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G02B5/30B32B7/023G02F1/1335G02F1/13363G09F9/00
CPCG02F1/13363G09F9/00G02B5/305G02B5/3083G02F2413/03G02F2413/04G02F2413/07G02F1/133528B32B7/023B32B7/03B32B27/06G02B5/30B32B2305/55B32B2307/42B32B2307/418B32B2457/20B32B7/02
Inventor 今野芳美柳沼宽教伊崎章典北村吉绍
Owner NITTO DENKO CORP
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