Patent ID: 7663797

Claim:
A multicolor display element, comprising: a display electrode, a counter electrode, an electrolyte, and a display layer, wherein the counter electrode is disposed oppositely to the display electrode, the electrolyte is filled into a space provided between the display electrode and the counter electrode, the display layer is disposed on the surface, which faces the counter electrode, of the display electrode, the display layer contains plural electrochromic compositions in a condition that the plural electrochromic compositions are separated into plural layers within the display layer or are mixed together within the display layer, wherein the plural electrochromic compositions are each capable of coloring differently, and represent the following relations: | Vc ( E 1)|>| Vc ( E 2)|> . . . >| Vc ( Ei )|> . . . >| Vc ( En )|, and | Qc ( E 1)|<| Qc ( E 2)|< . . . <| Qc ( Ei )|< . . . <| Qc ( En )| Ei: “i” th electrochromic composition, n: total number of electrochromic compositions, Vc(Ei): threshold voltage for coloring condition in terms of “i” th electrochromic composition, Qc(Ei): charge amount required for coloring into sufficient color density in terms of “i” th electrochromic composition; and at least one of threshold voltage for coloring condition, threshold voltage for decoloring condition, charge amount required for coloring into a sufficient color density, and charge amount required for sufficiently decoloring, are substantially different each other between the plural electrochromic compositions.