Patent ID: 8199086

Claim:
A stacked photodisplay comprising: at least first and second liquid crystal layers of cholesteric liquid crystal material stacked in a fixed relation to each other including a first and a second photosensitive chiral additive, respectively; wherein said first liquid crystal layer comprises exposed regions that have been exposed to electromagnetic radiation including said first photosensitive chiral additive of a twisting power, and unexposed regions that have not been exposed to said electromagnetic radiation, said unexposed regions including said first photosensitive chiral additive of a different twisting power than in said exposed regions; wherein said second liquid crystal layer comprises exposed regions that have been exposed to electromagnetic radiation including said second photosensitive chiral additive of a twisting power, and unexposed regions that have not been exposed to said electromagnetic radiation, said unexposed regions including said second photosensitive chiral additive of a different twisting power than in said exposed regions; electrically conductive layers disposed on both sides of each of said first and second liquid crystal layers; a light absorbing layer positioned to absorb light passing through said first and second liquid crystal layers; wherein said first liquid crystal layer includes a first fixed image portion and said second liquid crystal layer includes a second fixed image portion that is different than said first fixed image portion, wherein each of said first fixed image portion and said second fixed image portion comprises one of said exposed regions and said unexposed regions in a planar texture and the other one of said exposed regions and said unexposed regions in a focal conic texture so as to resist degradation over time, wherein said first and second fixed image portions combine to form an image on said photodisplay.