Patent ID: 7443562

Claim:
A display device comprising: a porous body impregnated with electroendosmosis liquid, a transparent plate which is opposed to the porous body with a space intervening therebetween and is provided on its side facing the porous body with a light diffusive reflection surface and on the other side opposite to the one side with a light transmission surface, and an electric field forming means which forms an electric field acting on the electroendosmosis liquid and controls whether the electroendosmosis liquid is brought into contact with the light diffusive reflection surface by changing the electric field to selectively move the electroendosmosis liquid toward the porous body or the space; and wherein the light diffuse reflection surface is a surface which is rough and has a mean surface roughness, and the light diffuse reflection surface is rough to the extent that light is diffused when the electroendosmosis liquid remains inside the porous body and light is transmitted therethrough when the space is filled with the electroendosmosis liquid.