Patent ID: 7396049

Claim:
A book device comprising: at least one power source; a plurality of flexible sheets, at least one flexible sheet having: a) a substrate having at least one exteriorly oriented visually discernable surface, the exteriorly oriented, visually discernable surface having at least one light transmissive region located thereon; b) at least one electroluminescent lamp assembly positioned proximate to the substrate surface, the electroluminescent lamp assembly comprising at least one first electrode, electroluminescent material and at least one second electrode, wherein the electroluminescent material composes at least a portion of the at least one light transmissive region located on the substrate surface, wherein the at least one power source is in communication with the at least one electroluminescent lamp assembly; c) a protective layer isolating the electroluminescent lamp assembly and the at least one power source from deleterious interaction with environment external to the flexible sheet; and d) at least one sensor configured to automatically detect a change in at least one environmental condition and to cause the at least one electroluminescent lamp assembly to receive power from the at least one power source in response to the automatically detected change substrate opposed-to-the-light.