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{{otheruses4|a display technology concept|the similarly named concept in photography|angle of view}}
In [[display device|display technology]] parlance, '''viewing angle''' is the maximum [[angle]] at which a display can be viewed with acceptable visual performance. In a technical context, this angular range is called [['''''viewing cone''''']] defined by a multitude of [[viewing direction]]s.
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" being dependent on the display type in question. For example, some [[projection screen|projection screens]] 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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