A scanning apparatus for an electrophoretic matrix display panel, has a horizontal (X-line) electrode driving circuit to provide a selecting pulse, a vertical (Y-line) electrode driving circuit to provide a data pulse, and an information signal supply means. An electric field is imposed across cells...http://www.google.com/patents/US4041481?utm_source=gb-gplus-sharePatent US4041481 - Scanning apparatus for an electrophoretic matrix display panel
