| 摘要 |
PROBLEM TO BE SOLVED: To provide a display medium which has a small decrease in contrast with time in spite of repetitive display when the display is performed by using electrophoretic colored particles and a member having optical characteristics different from those of the electrophoretic colored particles. SOLUTION: The invention provides the display medium including: a pair of substrates facing one another, at least one of the substrates being transparent; electrodes provided at opposing surfaces of the pair of substrates; and a light dimming layer disposed between the pair of substrates, the light dimming layer containing the electrophoretic colored particles, a dispersion medium for dispersing the electrophoretic colored particles, and the reflection member having light reflection characteristics different from those of the electrophoretic colored particles, and the surface of the electrophoretic colored particles and the surface of the reflection member satisfying the following formula (1): 180>¾θp-θr¾≥20, in formula (1),θp representing a contact angle (degrees) between the surface of the electrophoretic colored particles and water, andθr representing a contact angle (degrees) between the surface of the reflection member and water. COPYRIGHT: (C)2008,JPO&INPIT
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