Patent ID: 7974000

Claim:
An optical shutter comprising: a first transparent electrode and a second transparent electrode disposed to face each other; a reflection wall that surrounds an inner space disposed between the first and the second transparent electrodes so that the inner space is closed, and reflects light; a transparent insulation layer formed over an inner surface of the first transparent electrode, an inner surface of the second transparent electrode, and inner surfaces of the reflection wall; at least one charged particle disposed in the closed inner space, wherein the at least one charged particle is a one charged particle disposed in the closed inner space; a first concave groove is formed in the transparent insulation layer on the first transparent electrode so that the one charged particle is operable to land at the first concave groove; and a second concave groove is formed on the transparent insulation layer on the second transparent electrode so that the one charged particle is operable to land at the second concave groove.