A graphic display unit makes it possible for a stereo display or blink operation to be implemented on a window system with each window having an arbitrary contour, and on a window by window basis. The graphic display unit of this invention comprises a frame buffer for a right eye, a frame buffer...http://www.google.com.au/patents/US5801705?utm_source=gb-gplus-sharePatent US5801705 - Graphic display unit for implementing multiple frame buffer stereoscopic or blinking display, with independent multiple windows or blinking regions 
