Patent ID: 7459218

Claim:
A rewritable thin image display sheet comprising: a base layer; a transparent layer disposed apart from said base layer by a given distance; and a medium filled in the space between said base layer and said transparent layer and containing- a magnetic powder dispersed therein, said medium being adapted to be changeable between a first phase where said magnetic powder is allowed to be displaced and a second phase where said magnetic powder is prohibited from being displaced, wherein said base layer includes an electrode layer and a resistive layer, said electrode layer is an overall electrode covering over an inner surface of said resistive layer on the side of the said transparent layer, said resistive layer has an electrical resistivity in a range of 10-300 Ω·cm and has an outer surface which is entirely exposed, said medium is made of a wax which exhibits said first phase in a temperature range of 60 to 120° C. and said second phase at a lower temperature than the temperature at which said first phase is exhibited.