A video display system has a circuit for sequentially superimposing N (N.gtoreq.2) information signals upon a video signal for display on the picture screen of a television receiver, at predetermined positions in parallel relation, and a circuit for changing the display positions so as to display information...http://www.google.es/patents/US4821102?utm_source=gb-gplus-sharePatente US4821102 - Video display system with selective display of operating conditions
Video display system with selective display of operating conditions
