Patent ID: 7116309

Claim:
A photowriting display device comprising: a plurality of electrochromic display members, each including: a photoconductor in which only regions irradiated with writing light generate carriers to create conductivity; an electrochromic layer in which light absorption at said regions is reversibly changed owing to electrochemical oxidation and reduction reactions caused to occur due to the conductivity; an electrolyte on which said electrochromic layer is laminated or in which material of said electrochromic layer is dissolved; and a pair of electrodes laminating said photoconductor, said electrochromic layer, and said electrolyte, in between, wherein said electrochromic display members are developed into different colors, and further wherein said electrochromic display members in corresponding layers have different photosensitive wavelengths for writing from one another, and writing on said electrochromic display member in an arbitrary layer is performed by selectively irradiating writing lights each emitting one of said different wavelengths.