Electrochromic Display Device

An electrochromic display device comprising:

• a first substrate;
• a first electrode provided in an upper surface of the first substrate;
• a second substrate formed by a transparent material, the second substrate being provided above the first substrate to be opposed to the first substrate;
• a second electrode provided in a lower surface of the second substrate, at least a part of the second electrode being formed with a transparent electrode material;
• and
• an electrochromic composition layer provided in between the first substrate and the second substrate, wherein
• the electrochromic display device is driven by a passive matrix drive in which the electrochromic display device performs a display by an energization between the first electrode and the second electrode, and performs a erasion of the display by an energization in a direction reverse to a direction of the energization between the first electrode and the second electrode for the display, wherein
• the first electrode comprises a plurality of electrodes which extend parallely, wherein
• the second electrode comprises a plurality of transparent display electrodes which extend parallely in a direction perpendicular to an extending direction of the first electrode, wherein
• a pixel is formed in a region where the first electrode and the second electrode are in a grade separated crossing, wherein
• at least a surface of the first electrode and of the second electrode is respectively oxidized, wherein
• the electrochromic composition layer comprises (i) a plurality of insulative partition walls which extend parallely in the direction perpendicular to the extending direction of the first electrode in a state of being arranged between the second electrode adjoining each other, and (ii) an electrochromic composition introduced between the insulative partition walls adjoining each other, the electrochromic composition including a supporting electrolyte, a polar solvent, and a leuco dye, and wherein
• the electrochromic display device displays a selected pixel by applying a voltage of a first potential difference between the first electrode used as a negative electrode and the second electrode used as a positive electrode, the first electrode and the second electrode respectively forming the selected pixel, and applies the voltage of a second potential difference smaller than the first potential difference so as not to cause any energization between the first electrode used as the positive electrode other than the first electrode forming the selected pixel, and the second electrode used as the negative electrode other than the second electrode forming the selected pixel.