www.google.dehttp://www.google.de/patents/US3710175?utm_source=gb-gplus-sharePatent US3710175 - TWINKLE EFFECT DISPLAY SYSTEM IN WHICH INFORMATION IS MODULATED AT A RATE WITHIN THE FLICKER FREQUENCY OF THE HUMAN EYE
TWINKLE EFFECT DISPLAY SYSTEM IN WHICH INFORMATION IS MODULATED AT A RATE ...
