Optical polarizing films
First Claim
1. An optical film, comprising a plurality of layers that form a plurality of optical repeat units, at least some of the optical repeat units having optical thicknesses equal to half of a wavelength of visible light, and wherein the optical film has a clear appearance at normal incidence when illuminated with unpolarized light.
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Accused Products
Abstract
Multilayer films are provided that exhibit a colored appearance when viewed at an oblique angle as a result of one or more reflection bands in the visible region of the spectrum. The films however provide no substantial reflection bands in either the visible or near infrared regions for light normally incident on the film. The films can be made to shift from clear at normal incidence to an arbitrary designed color at an oblique angle without necessarily becoming cyan.
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Citations
20 Claims
- 1. An optical film, comprising a plurality of layers that form a plurality of optical repeat units, at least some of the optical repeat units having optical thicknesses equal to half of a wavelength of visible light, and wherein the optical film has a clear appearance at normal incidence when illuminated with unpolarized light.
- 10. An optical film whose transmitted appearance when illuminated with unpolarized light changes from clear at normal viewing to a first color over an angular range of observation angles, and where the optical film does not appear cyan over such angular range.
Specification