Patent ID: 9097858
Filing Date: 2015-08-04
Classification: B42D,G02B

Abstract:
1. A composite retarder film having a first and second, generally opposed sides, comprising: a first film providing a first light retardation, the first film also having a first absorption characteristic suitable to, upon exposure to a first light beam comprising a write wavelength, absorptively heat the first film by an amount sufficient to change the first light retardation to a third light retardation while maintaining a structural integrity of the first film without changing a second retardation of a second film; the second film providing the second light retardation, the second film also having a second absorption characteristic suitable to, upon exposure to a second light beam comprising the write wavelength, absorptively heat the second film by an amount sufficient to change the second light retardation to a fourth light retardation while maintaining a structural integrity of the second film without changing the first retardation of the first film; and a first blocking layer disposed between the first and second film, the first blocking layer being adapted to at least partially block light of the write wavelength, wherein the first and second light beams are incident on the same side of the composite.