The pattern of uniformly spaced horizontal scan lines that cover the display space of a device, such as a computer monitor or television monitor.Within each line are pixels (picture elements) that can be illuminated individually.
See raster in Computer
The horizontal lines (scan lines) displayed on a TV or computer monitor. This is the origin of the term "raster graphics," which is the major category that all bitmapped images and video frames fall into (GIF, JPEG, MPEG, etc.). See raster scan, raster display, analog video and bitmapped graphics.