viewing angle; angle of view
Technical term used in optics, displays, and photography to describe the angular range from which a screen or scene can be viewed acceptably.
This LCD display has a wide viewing angle.
If the viewing angle is narrow, colors appear different when viewed from an angle.
Compound of 視野 (field of view) and 角 (angle). The exact historical derivation is uncertain, but the term is a straightforward technical coinage.