Shuji Yoneda

67.1: Active Matrix Electronic Paper with Silver Electrodeposition

In recent years, many technologies relating to electronic paper and related products have been developed or proposed. But the gulf between the quality of electronic paper so far achieved and the merits of standard paper still exists. Many technological problems are yet to be solved, and we chose to focus on improving the display quality of electronic paper documents, which is very important to document readability. We developed a 3.5 inch sheet of electronic paper, driven by an active-matrix using silver electrodeposition, and, for an electronic paper, exhibiting the highest level of whiteness in the world. The electronic paper has a white reflectivity of over 60%, approaching that of copy paper, and a contrast ratio of at least 20:1, which together realize visibility equivalent to copy paper.