raster

(noun)

A scanning pattern of parallel lines that form the display of an image projected on a cathode-ray tube of a television set or display screen.

Examples of raster in the following topics:

Cathode Ray Tube, TV and Computer Monitors, and the Oscilloscope
- In television sets and computer monitors, the entire front area of the tube is scanned repetitively and systematically in a fixed pattern called a raster .