A gray scale binary field corresponding to each of the pixels on a raster scan oscilloscope display. Each gray scale binary field has a portion of its bits assigned to correspond to the graphical information and a portion of its bits assigned to correspond to the sampled current and prior waveforms....http://www.google.co.uk/patents/US5283596?utm_source=gb-gplus-sharePatent US5283596 - Digitally synthesized gray scale for raster scan oscilloscope color display of overlapping multichannel waveforms
