An aircraft cockpit flight deck data display system for displaying, on a viewable display screen, typically anti-aliased graphical imaging data derived from aircraft sensors, generates or receives graphics processing language (GPL) commands that define the information intended for presentation on the display screen. The GPL commands are input to a video graphics processor that is operable to interpret the received GPL commands and to generate therefrom video imaging data transferable to the display screen to populate the screen with the intended information. The same GPL commands are also input to a comparator processor that is operable to interpret the received GPL commands and to generate therefrom selected “points of light”, comprising a limited subset of the video imaging data generated by the video graphics processor. The comparator processor-generated “points of light” are then compared to the respective corresponding video imaging data points generated by the video graphics processor to thereby validate the proper operation of the video graphics processor and the accuracy of the video imaging data generated by the video graphics processor.