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Overscan
The practice in which areas without useful video information are scanned outside the visible
screen area in order to make maximum use of the screen for display of active video information.
This practice is occasionally necessary because some video cards generate a video pattern that
is smaller than the visible screen area, resulting in an image that is smaller (and less legible) than
it needs to be.
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P
Parallelogram Distortion
See Geometric distortion.
Phosphor
Generic name for the class of substances that exhibit luminescence. To produce a picture on
screen, phosphors are deposited on the inner surface of the picture-tube screen and excited into
luminescence by the electron beam. Typical examples of phosphors are P22 medium short-
persistence phosphor and EBU high-color-saturation phosphor.
Pin-cushion Distortion
See Geometric distortion.
Pixel
Abbreviation for picture element, the smallest element of the picture that can be displayed on the
screen. The smaller the pixel size, the better the resolution of the monitor. Pixel size is
determined by the size of the electron spot on the screen and not necessarily by the phosphor
dot pitch (the size of the triad). Thus, a monitor with a large electron spot covering several triads
can exhibit poor resolution even though its dot pitch is small.
Pixel frequency
The number of pixels that can be written in a video line per second.
Pixel rate
See pixel frequency