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Viewing an HDTV from a position where the display occupies a 30-degree field of view is widely quoted as the SMPTE (or SMPTE 30) recommendation (equivalent to about 1.6264 times the screen size in a 16:9 TV).
At this distance, the individual pixels cannot be resolved while simultaneously maximizing the viewing area. For more TV resolutions, see "The optimal viewing distance". [3] [4] The TV image is composed of many lines of pixels. Ideally, the TV watcher sits far enough away from the screen that the individual lines merge into one solid image.
A good rule of thumb is that your viewing distance should be about 1.5 to 2.5 times the TV's diagonal measurement. For a 50-inch TV, this means sitting between 75 and 125 inches away.
The recommendation section should make it immediately clear that the relationship bewtween screen size, viewing angle, & distance only applies to 16:9 screens. While these are now ubiquitous, there are HD monitors that are 4:3, and 4:3 content will be viewed on 16:9 screens.
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The viewing cone refers to the effective viewing directions of an LCD display, as seen from the eye. This collection of angles resembles a cone. The concept has been introduced as an international standard ISO 13406-2, which defines it as the range of viewing directions that can safely be used for the intended task without "reduced visual performance".