Patent ID: 7123335

Claim:
A display sheet comprising in order: a) an optional substrate for carrying layers of material; b) first transparent conductors; c) an imaging layer, made by coating an emulsion of domains of liquid crystal material, comprising a substantial monolayer of isolated domains of liquid-crystal material dispersed in a continuous polymer matrix, said liquid-crystal material having a first reflecting state, wherein the first reflecting state is capable of reflecting in either the visible spectral region or the infrared spectral region depending on the incident light, defining either a first or second operating spectrum and a second weakly scattering state in said corresponding first or second operating spectrum, wherein said states are capable of being interchanged by an electric field, which states are capable of being maintained as a stable state in an absence of an electric field, wherein said domains of liquid-crystal material comprises a mixture of at least two populations, a first population comprising a first liquid-crystal material having a first λ max within the infrared spectral region and a second population comprising a second liquid-crystal material having a second λ max within the visible spectral region; d) second conductors disposed on an opposite side of said imaging layer from said first conductors, wherein either there is an infrared-light blocking layer, between the second conductors and the imaging layer, that blocks substantially all of the infrared light transmitted through the imaging layer, or the second conductors is substantially unreflective of light in the infrared region of the spectrum.