Patent ID: 7597624

Claim:
A method of determining the X-Y coordinates of a light gun on a television or video monitor coupled to a video game console, the method comprising the steps of: (a) upon a trigger event from the light gun, initiating a blanking signal to render the monitor black during a first vertical refresh cycle; (b) during a second vertical refresh cycle, non-sequentially increasing the voltage to each of the red, blue and green channels in three separate screen sections to create a display split vertically between the three colours; (c) polling the monitor during the second vertical refresh cycle with the light gunadapted to be capable of separately detecting a blue, red or green light pulse; (d) determining the X-Y coordinates on the basis of the colour detected by the light gun and the length of time which elapses between the start of the second vertical refresh cycle and the detection of the red, blue or green light pulse.