Patent ID: 7848003

Claim:
A device comprising: a substrate that is at least partially optically transparent; a first layer over the substrate, wherein the first layer is partially optically absorptive, partially optically reflective, and partially optically transmissive; a second layer over the substrate and spaced from the first layer, the first layer located between the substrate and the second layer, wherein the second layer is partially optically absorptive, partially optically reflective, and partially optically transmissive, the second layer having a thickness in the range of 30 to 300 Angstroms; and a light source responsive to a signal and positioned relative to the substrate such that the first layer and the second layer are located between the substrate and the light source, wherein light emitted from the device in a first direction comprises a first portion of light incident on the substrate, transmitted through the substrate, transmitted through the first layer, reflected by the second layer, transmitted through the first layer, transmitted through the substrate, and emitted from the substrate in the first direction; a second portion of light incident on the substrate, transmitted through the substrate, reflected by the first layer, transmitted through the substrate, and emitted from the substrate in the first direction; and a third portion of light from the light source incident on the second layer, transmitted through the second layer, transmitted through the first layer, transmitted through the substrate, and emitted from the substrate in the first direction; and wherein the light emitted from the device in the first direction has a first color when the light source emits light and a second color when the light source does not emit light, the second color different from the first color.