Patent ID: 7864407

Claim:
A display element comprising opposed electrodes having therebetween: an electrolyte layer comprising an electrolyte solvent, and silver or a compound comprising silver in the chemical structure; and a porous-white scattering material provided on at least one of the opposed electrodes, the display element being driven by a driving operation so as to dissolve silver or to deposit silver by using the opposed electrodes, wherein the porous-white scattering material comprises white pigment particles fixed with each other with a water soluble polymer that is substantially insoluble in the electrolyte solvent; and the electrolyte layer comprises at least one compound represented by Formula (3) or Formula (4): R 7 â€”Sâ€”R 8 Formula (3) wherein R 7 and R 8 each represent a substituted or unsubstituted hydrocarbon group, provided that R 7 and R 8 may be combined to form a ring, and, when a ring containing S is formed, no aromatic group is contained, wherein M represents a hydrogen atom, a metal atom or a quarternary ammonium Z represents a nitrogen-containing heterocycle; n represents an integer of 0 to 5; R 9 represents a hydrogen atom, a halogen atom, an alkyl group, an aryl group, an alkylcarbonamide group, an arylcarbonamide group, an alkylsulfonamide group, an arylsulfonamide group, an alkoxy group, an aryloxy group, an alkylthio group, an arylthio group, an alkylcarbamoyl group, an arylcarbamoyl group, a carbamoyl group, an alkylsulfamoyl group, an arylsulfamoyl group, a sulfamoylgroup, a cyano group, an alkylsulfonyl group, an arylsulfonyl group, an alkoxycarbonyl group, the aryloxycarbonyl group, an alkylcarbonyl group, an arylcarbonyl group, an acyloxy group, a carboxyl group, a carbonyl group, a sulfonyl group, an amino group, a hydroxy group, or a heterocycle group; and when n is an integer of two or more, each R 9 may be the same or different, and each R 9 may be combined to form a condensed ring.