Image display medium, image display device, and image display method

A reflective image display medium comprising:

• a display substrate;
• a back substrate;
• a plurality of first particles, which are sealed between the display substrate and the back substrate, configured to reflect light and to move to a display substrate side due to an electric field;
• a plurality of second particles sealed between the display substrate and the back substrate, the second particles having substantially black color and configured to move to a back substrate side as the first particles move to the surface of the display substrate side;
• and
• a filter, which is disposed in the display substrate side, having a chromatic region and an achromatic region, the achromatic region being configured to transmit a reflected light reflected by the first particles to an outside of the reflective image display medium.