Shigenobu Hirano

5.3: Novel Design for Color Electrochromic Display

developed a technology for a new full-color reflective electrochromic display (ECD) based on the subtractive color mixing model. This improves display brightness and color reproducibility. Additional advantage is simple production process. An active matrix driving of the full-color reflective ECD has been demonstrated successfully.

A photon-mode full-color rewritable image using photochromic compounds

A photon-mode full-color rewritable image has been demonstrated. Three types of photochromic fulgides having yellow, magenta, and cyan color were used as rewritable dyes. Photochromic fulgides were mixed and coated on a white polyethylene terephthalate film. Upon irradiation with three (red, green, and blue) visible light beams, a wide hue extent, a high white reflectance of over 80%, and a high contrast ratio of over 45:1 were attained. A full-color image retains its colors for over 1 hour under standard-office-brightness conditions (700 Ix). The photochemical coloration-decoloration cycles could be repeated over 100 times without substantial losses.

20.4: Photon-Mode Full-Color Rewritable Image Using Photochromic Compounds

Photon-mode full-color rewritable image has been demonstrated. Three kinds of photochromic fulgides were used as rewritable dyes. Photochromic fulgides and polystyrene were mixed and coated on a white polyethylene terephthalate film. On irradiation with three (red, green, and blue) visible light beams, wide hue extent, high white reflectance over 80 %, and high contrast ratio over 45 were attained. A full-color image keeps their colors over an hour under the standard office brightness (700 lx) without substantial fatigues. The photochemical coloration-decoloration cycles could be repeated over 100 times.