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In [[display device|display technology]] parlance, '''viewing angle''' is the [[angle]] at which a display can be viewed with an acceptable visual performance. In a technical context, the angular range is called [[viewing cone]] defined by a multitude of [[viewing cone|viewing directions]]. The viewing angle can be an angular range over which the display view is acceptable,<ref>{{cite web |url=https://support.elotouch.com/TechnicalSupport/Video/viewing_angle/ |title=EloTouch Solutions {{!}} Support |website=support.elotouch.com |access-date=2019-11-21}}</ref> or it can be the angle of generally acceptable viewing, such as a twelve o'clock viewing angle for a display optimized or viewing from the top.<ref>{{cite web |url=https://focuslcds.com/journals/lcd-viewing-angles-explained/ |title=LCD Viewing Angles Explained |website=Focus LCDs |date=10 December 2018 }}</ref>
The image may seem garbled, poorly saturated, of poor [[contrast ratio|contrast]], blurry, or too faint outside the stated viewing angle range, the exact mode of "failure" depends on the display type in question. For example, some [[projection screen]]s reflect more light perpendicular to the screen and less light to the sides, making the screen appear much darker (and sometimes colors distorted) if the viewer is not in front of the screen. Many manufacturers of projection screens thus define the viewing angle as the angle at which the [[luminance]] of the [[image]] is exactly half of the maximum. With LCD screens, some manufacturers have opted to measure the contrast ratio and report the viewing angle as the angle where the contrast ratio exceeds 5:1 or 10:1, giving minimally acceptable viewing conditions.
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