Methods for updating color electrophoretic displays

Abstract

An electrophoretic medium includes a fluid, a first, light scattering particle (typically white) and second, third and fourth particles having three subtractive primary colors (typically magenta, cyan and yellow); at least two of these colored particles being non-light scattering. The first and second particles bear polymer coatings such that the electric field required to separate an aggregate formed by the third and the fourth particles is greater than that required to separate an aggregate formed from any other two types of particles. Methods for driving the medium to produce white, black, magenta, cyan, yellow, red, green and blue colors are also described.

1 . A color electrophoretic display comprising a layer of electrophoretic media, a controller, and a bezel surrounding the layer of electrophoretic media, the bezel including one or more light elements, wherein the controller is configured to synchronize operation of the one or more light elements with a transition between images displayed by the display. 
     
     
         2 . The color electrophoretic display of  claim 1 , wherein the controller is configured to illuminate the one or more light elements during the transition between images displayed by the display. 
     
     
         3 . The color electrophoretic display of  claim 1 , wherein the controller is configured to switch off the one or more light elements during the transition between images displayed by the display. 
     
     
         4 . The color electrophoretic display of  claim 1 , wherein the controller is configured to intermittently illuminate the one or more light elements during transition between images displayed by the display.