The Driving Software
We're now in a position to measure the response of one or more pixels. But to do that, we need to simulate the screen with a video sequence appropriate to the test and perfectly reproducible. The simulation software that we use can be adapted to all screen resolutions and all refresh frequencies that the monitor is capable of supporting. The software generates a flashing line in the middle of the screen, which flashes at the vertical blanking interval of the monitor. It is vital that all the pixels measured are on the same line because they are stimulated at the same instant (or at least very rapidly one after the other), so it's better if the delay between the illumination of two pixels is negligible compared to the measurement time. The vertical blanking interval of a CRT is of the order of 60 kHz or 15 microseconds of uncertainty compared with the 8 milliseconds of latency measured. This represents an uncertainty of around 0.1%, which is perfectly acceptable.
