Optical stack and image display device using the optical stack

Abstract

[Problem] To provide an optical laminate that has low environmental impact, excellent adhesion to image display panels, excellent visibility through polarized sunglasses, and can suppress end-color fading. [Solution] The optical laminate of the present invention, from the viewing side, sequentially comprises: a first retardation layer, a polarizing plate including a polarizing element, a second retardation layer, and an adhesive layer. The Re(550) of the first retardation layer is 110nm~150nm, and the angle formed by the slow axis of the first retardation layer and the absorption axis of the polarizer is 40°~50° or 130°~140°; the second retardation layer, combined with the polarizer, has circular polarization or elliptical polarization functions, and satisfies the relationship Re(450) < Re(550); the humidity permeability of the first retardation layer measured at 40℃ and 90%RH is 50g / m2・24h~1200g / m2・24h; the distance from the viewing side surface of the polarizer to the viewing side surface of the optical laminate is 35μm or more. The adhesive layer is composed of an active energy line curing adhesive, and the residual monomer content in the adhesive layer is less than 3000ppm.

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