APA RASTER DISPLAY MEMORY.

Abstract

Raster displays create images by repeatedly scanning a CRT from left to right and top to bottom. The electron beam's intensity is appropriately modified at discrete points (or pixels) on the screen, thus presenting the image information as intensity samples at each pixel. The authors discuss display designs which store the image point by point in random access memory, so that independent update of every pixel is possible. Such displays are capable of producing arbitrarily complex, flicker-free images. We call such displays APA raster scan displays (APA stands for All-Points-Addressable).