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The maximum viewing distance will provide a viewing angle of approximately 16 degrees with Best Buy's recommendation and approximately 20 degrees with Crutchfield's. The maximum viewing distance (minimum viewing angle) provided by Best Buy aligns with vision theory on the highest spatial frequencies perceivable by the human visual system. [41]
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.
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".
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.
Obviously the viewed angle of the display depends on the size of the display and the distance of the viewer from the display. For SDTV, the horizontal viewing angle at the optimal distance is about 11 degrees. For 1080i the horizontal viewing angle is tripled to 33 degrees. Algr - Your example reinforces my point; it doesn't contradict it.
Size Up to 43 in (1.1 m) [41] Up to 120 in (3.0 m) [42] Up to 150 in (3.8 m) [43] (152 in experimental) [44] Up to 97 in (2.5 m) [45] Maintenance Hazardous to repair or service due to high-voltage, requires skilled convergence calibration and adjustments for geographic location changes. [46]
Wider viewing angles (+178°) than those of an LCD; the image does not degrade (dim and distort) when viewed from a high angle, as occurs with an LCD [16] [17] No motion blur; eliminated with higher refresh rates and faster response times (up to 1.0 microsecond), which make plasma TV technology ideal for viewing the fast-moving film and sport ...
[8] [9] Hitachi also improved the viewing angle dependence further by optimizing the shape of the electrodes (Super IPS). NEC and Hitachi became early manufacturers of active-matrix addressed LCDs based on the IPS technology. This is a milestone for implementing large-screen LCDs having acceptable visual performance for flat-panel computer ...