Image display medium, image display device, and image display method
An image display medium comprises a display member, a back substrate, spacers having a cell structure held between the substrates, and first particles and second particles, whose colors and charging polarities are different from one another, enclosed between the display member and back substrate. The display member includes a transparent support base, a transparent electrode formed thereon, a transparent dielectric layer formed on the transparent electrode, filters formed on the opposite side from the transparent electrodes side of the support base, and a protective layer formed thereon.
1. 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.
2. The reflective image display medium according to claim 1 , wherein the particles are at least one of substantially white colored particles, metal surfaced particles, or retroreflective particles.
3. The reflective image display medium according to claim 1 , further comprising a plurality of electrodes corresponding to the achromatic regions, wherein the electrodes control the first particles to concentrate in the portion.
4. The reflective image display medium according to claim 1 , wherein the filter has a plurality of the chromatic regions, and the achromatic region is disposed between the chromatic regions.
5. The reflective image display medium according to claim 1 , wherein the filter has a plurality of sets of regions, each of the sets having a plurality of the chromatic regions and the achromatic region, each of the chromatic regions having one of colors in a combination capable of forming an achromatic color by an additive process.
6. The reflective image display medium according to claim 5 , wherein the combination includes colors of red, green, and blue.
7. The reflective image display medium according to claim 1 , further comprising an irradiating unit that emits light to the first particles through the filter.
8. The reflective image display medium according to claim 1 , wherein the display substrate and the filter are integrated.
9. The reflective image display medium according to claim 1 , wherein the achromatic region is colorless.