Patent ID: 7083105

Claim:
An IC card comprising: a piezoelectric transducer capable of generating electric power by an external stimulus; and a display driven by the electric power generated by the piezoelectric transducer so as to display information, wherein the external stimulus is applied by bending the IC card into a curved shape, wherein the piezoelectric transducer is disposed in a portion of the IC card where curvature occurs and the display is disposed in a portion where no curvature occurs, and wherein the piezoelectric transducer contains at least one inorganic material or at least one organic material, where the inorganic material is selected from PbLaZrTiO 3 , SrBi 2 Ta 2 O 9 , (Bi, La) 4 Ti 3 O 12 , and Bi 4 Ti 3 O 12 , and the organic material is selected from polyethylene trifluoride, polyethylene tetrafluoride, a copolymer of vinylidene fluoride and ethylene trifluoride, a copolymer of vinylidene fluoride and ethylene tetrafluoride, polyvinyl alcohol, polyethylene terephthalate, polyoxymethylene, polyethylene, polypropylene, polyphenyl sulfide, crystalline polystyrene, crystalline polymethyl methacrylate, and crystalline polycarbonate.