Viewing angle: Difference between revisions

Revision as of 07:35, 20 April 2018

Revision as of 19:29, 21 November 2019

Line 1:

{{About|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, thisthe 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|last=|first=|date=|website=Focus LCDs|url-status=live|archive-url=|archive-date=|access-date=}}</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.

The viewing angle is measured from one direction to the opposite, giving a maximum of 180° for a flat, one-sided screen. SomeA display devicesmay exhibit different behaviour in horizontal and vertical axisaxes, requiring users and manufacturers to specify maximum usable viewing angles in both directions. Usually the screens are aligned and useddesigned to facilitate greater viewing angle in horizontal level, and smaller angle in the vertical level, should the two of them be different in magnitude.

The viewing angle for some displays are specified in only a general direction such as six o'clock or twelve o'clock.

Early [[LCD]]s had strikingly narrow [[viewing cone]]s, a situation that has been improved with current technology.

Line 16 ⟶ 18:

== References ==

*{{cite web|url=https://support.elotouch.com/TechnicalSupport/Video/viewing_angle/|title=Elo Touch Solutions &mdash; Viewing angle|publisher=elotouch.com|accessdate=2018-04-20}}

*{{cite web|url=http://www.grandwell.com/viewing_angle_brightness.php|title=Indoor & Outdoor LED Signs - Digital Signage - LED Displays - Electronic Signs &#124; Grandwell|publisher=grandwell.com|accessdate=2014-01-25}}