| 摘要 |
PROBLEM TO BE SOLVED: To provide a calling card using a reversible information display panel with a capability of effectively inhibiting the consumption of natural resources due to the discarding of the calling card through with its original use purpose. SOLUTION: This calling card is structured of the reversible dry information display panel 1 which displays required information on the transparent substrate side by moving two different kinds of display media using an electric field formed on the surface of a substrate. These display media have differing colors and electric charge characteristics and are sealed in a closed space between two mutually opposed substrates, at least, one of which is transparent. (1) The two different kinds of the display media with differing colors and electric charge characteristics, are used, (2) the average particle diameter of the particle for the display medium used for the information display panel, falls within the range of 3 to 10μm, and (3) the gross thickness of the information display panel is 10μm to less than 1 mm. COPYRIGHT: (C)2006,JPO&NCIPI
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