Photowriting display device and photowriting display unit incorporating the same

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 which are developed into different colors are shifted in a direction of the surface of lamination to expose each of said electrodes of said electrochromic display members respectively at an end of said writing display plate,
• a writing head which incorporates at least one light emitting portion so as to emit writing light, and
• a sliding contact, which is arranged to make electrical contact with each of said exposed electrodes respectively, is provided for said writing head.

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
• wherein writing on said electrochromic display members in an arbitrary layer is performed in such a way that said electrochromic display member in each layer is selectively applied with voltage or an electric current and simultaneously projected with a writing light which emits light at a predetermined unique wavelength specific to each layer.

A photowriting display apparatus comprising:

• a photowriting display device including an electrochromic display member containing:
• 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,
• a writing display plate provided with said photowriting display device;
• and
• a writing head which incorporates a plurality of light emitting portions disposed in a line opposite to said writing display plate so as to emit writing lights, said plural light emitting portions being moved in parallel with said writing display plate in a direction perpendicular to a direction of the disposition of said plural light emitting portions.