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If the camera's angle were always the same, an ideal viewing distance could be easily calculated. However, the camera's horizontal angle varies as the focal length of its lens changes. If the camera's sensor has fixed dimensions, a shorter focal length (wide angle) lens captures a wider angle of view, requiring the viewer to sit closer to the ...
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 ...
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".
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.
On 2D displays, such as computer monitors and TVs, display size or viewable image size (VIS) refers to the physical size of the area where pictures and videos are displayed. The size of a screen is usually described by the length of its diagonal , which is the distance between opposite corners, typically measured in inches.
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.
[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 ...
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]