Light control film for use in e.g. passport, has safety feature formed in microstructures, and designed not visible when film is viewed in false view angle, and visible when film is viewed in correct view angle or range of view angles

摘要

The film (10) has light-controlling microstructures (12) i.e. linear structures, formed in the film and provided parallel to each other. A safety feature e.g. portrait image, is formed in the microstructures. The film is transparent in a primary view angle (14). The safety feature is designed not visible when the film is viewed in a false view angle, and visible when the film is viewed in a correct view angle (22) or a range of view angles. The correct view angle or the range of view angles is obtained, in which the film is rotated around an axis perpendicular to a surface of the film. Independent claims are also included for the following: (1) a document (2) a method for producing a safety feature in a light control film.