The device of this invention controls a cathode ray tube (CRT) in order to display desired images on a selected region of the screen. Locations on the screen are identified by horizontal and vertical addresses. The device comprises means for storing information to be displayed on the screen of the cathode...http://www.google.de/patents/US5150107?utm_source=gb-gplus-sharePatent US5150107 - System for controlling the display of images in a region of a screen
