A method of driving an electrochromic display device and the electrochromic display device therefor the latter including an electrochromic display cell having two opposed substrates at least one of which is transparent, a plurality of electrodes respectively applied to the opposed substrates and an electrochromic...http://www.google.com.au/patents/US4322133?utm_source=gb-gplus-sharePatent US4322133 - Method of driving electrochromic display device and electrochromic display device therefor
