Patent ID: 7414776
Filing Date: 2008-08-19
Classification: G02F

Abstract:
1. A method of forming an image in an electrophoretic display device comprising an electrophoretic display layer located between two conductive film substrates, at least one of which is transparent, wherein the electrophoretic display layer includes therein a multiplicity of individual units that contain a display medium, wherein the display medium comprises a liquid system, at least one thermally reversible gelling agent, and at least one set of particles exhibiting a color, the method comprising heating the display device to a temperature of about or above a melting point of the at least one thermally reversible gelling agent, subsequently forming an image in the display device by selective application of an appropriate field to selected ones of the multiplicity of individual units to move the at least one set of particles within the heated display medium, and subsequently cooling the display device to a temperature of about or below a gel point of the at least one thermally reversible gelling agent to fix the image in a gel state.