A segmented ball for an electrical twisting ball color display device, the device being composed of different sets of spheroidal balls rotatably disposed in an elastomer substrate, each set being associated with a different display color. The segmented ball includes a colored interior segment surrounded...http://www.google.de/patents/US5892497?utm_source=gb-gplus-sharePatent US5892497 - Additive color transmissive twisting ball display
