Patent ID: 6900789
Filing Date: 2005-05-31
Classification: G02F,G09G

Abstract:
1. A reversible image display medium comprising: two substrates opposed to each other with a gap therebetween; one or more developer accommodating cells formed between the two substrates, each having a periphery surrounded by a partition wall; and a dry developer contained in each of the cell(s), the dry developer containing at least two kinds of frictionally chargeable dry developing particles having different chargeable polarities and different optical reflection densities; wherein an image is displayed by forming an electrostatic latent image corresponding to the image to be formed one of the two substrates to drive the developing particles in an electrostatic field based on the electrostatic latent image; and wherein a surface, which faces the developing particles, of the substrate for carrying the electrostatic latent image has a surface resistivity of at least 1×10