A multisegmented ball for an electrical twisting ball display device made up of spheroidal balls rotatably disposed in an elastomer substrate. The ball is composed of segments arrayed substantially parallel to one another, each segment being adjacent to at least one other segment and to no...http://www.google.fr/patents/US5717514?utm_source=gb-gplus-shareBrevet US5717514 - Polychromal segmented balls for a twisting ball display
Polychromal segmented balls for a twisting ball display
