Patent ID: 7341189
Filing Date: 2008-03-11
Classification: G06K

Abstract:
1. A spectrally-encoded label comprising: an emitting layer arranged so as to emit output light in response to input light incident thereon; and a spectrally-selective transmissive optical film, coating, or grating applied to the emitting layer and arranged so that light incident on the emitting layer is first transmitted through the transmissive film, coating, or grating, wherein: the transmissive film, coating, or grating exhibits a transmissive label spectral signature that is arranged according to a spectral-encoding scheme so as to represent predetermined label information within the spectral encoding scheme; the emitting layer of the label is arranged so as to emit output light in response to input light transmitted by the spectrally-selective transmissive optical film, coating, or grating according to the label spectral signature; and the spectrally-selective transmissive optical film, coating, or grating includes at least two distinct areal segments each having a corresponding distinct areal spectral signature substantially spatially uniform over the corresponding areal segment, and the label spectral signature comprises a combination of the distinct areal spectral signatures that is independent of any spatial arrangement of the areal segments.