Patent ID: 8228291

Claim:
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, wherein each of the first particles has a size smaller than a size of the achromatic region and concentrates in a portion, which corresponds to the achromatic region, of the display substrate side due to the electric field so as to increase the reflected light.