On the viewing screen of a display device, e.g., a computer monitor, horizontal shifting of the entire displayed image. Note: The panning direction is at a right angle with respect to the scrolling direction. 2. In video technology, the use of a camera to scan a subject horizontally. 3. In antenna systems, successively changing the azimuth of a beam of radio-frequency energy over the elements of a given horizontal region, or the corresponding process in reception.