| 摘要 |
PROBLEM TO BE SOLVED: To provide a reversible image display medium which can reduce paper, ink, etc., which are used for the conventional image display, since it can perform repeatingly the image display and image erasure, is superior in contrast, and can display an image with high quality stably over the long-term with high resolution. SOLUTION: The display medium has two sheets having optical transmission, a developer accommodation cell formed between them and surrounded with a partition wall, and a dry developer included in each cell, and the developer includes dry developing particles, of which the electrification polarity differs mutually and the optical reflection density differs mutually and which have triboelectrification. Ratio Sn/So of the area Sn of the non-image part to the medium unit area So is in the ronge of 0.0001 to 0.5, or (1-Sa/Sb) is in the ronge of 0.0001 to 0.5.
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