3D TVs-Viewing Position along with Optimum Lighting.

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by: lyndon-johngalloway
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Word Count: 494
Date: Sun, 6 Mar 2011 Time: 11:26 PM
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Viewing angle is the angle at which the tv display is viewed, with respect to the axis of the tv screen. At tilted angles, the contrast is affected, as colors disappear gradually, thereby changing the screen brightness. Consequently, pictures would seem washed out. However, plasma HDTVs present decent viewing angles, when compared with LCDs (Liquid Crystal Displays), which are still in the process of improvement. The underlying reason is because of the pixel alignment in the plasma flat panel displays, compared to LCDs.
In LCDs, a directional backlight lights up every pixel, and the best intensity is obtained while viewing from a zero degree angle, i.e., a perpendicular position. Moving away from the axis diminishes the backlight that reaches the eye, dropping the contrast level at tilted angles. Diffuse-scattering on the screen contributes with a reduction of directional backlight. In Plasma flat screens, the phosphors on the display, that are excited by Ultra Violet light, spread out colors uniformly in every direction. This providessuperior viewing angles. Surrounding lighting as well impacts viewing, as a dark environment causes the iris to open more widely to permit additional light. Light from the edges leads to scattering, causing less image correctness on the retina, but a bright screen offers superior contrast. A normal lighting must be such that the eye is able to adjust without difficulty when looking away from the screen towards some other object. For that reason, illumination differences should not be large, in order to eliminate stress on the eye.
Before the advent of flat screen TVs, a great idea was to put a light behind the Television set. At present, fluorescent bulbs and LEDs are used around the image's edge to throw a smooth light to the wall behind the set, thereby reducing the brightness difference between the surroundings and the picture. A light on the viewer's side would reflectin the screen, causing harm. Therefore, light should not fall on the viewers or on the screen. A small lamp can be used to illuminate either the floor or the ceiling, such that nothing is reflected back to the viewer.
Viewing distances and tv dimensions are not dealt with rightly in many living rooms. The screen size determines the amount of work for the eye, and while the eye can manage its focus on the screen, it can't control the brightness adjustment. Bearing in mind the field of vision, while the picture occupies the central area, the eye is not distracted by surrounding objects, and effortlessly adjusts to the picture's brightness.
A perfect viewing distance would be two times the image width, as it would guarantee that the picture occupies the central field of the eye's vision, enabling superior concentration. Therefore, if the tv is sufficiently large, it is recommended to view TV in the dark, but for smaller TVs, surrounding lighting is adviced. Optimum lighting, coupled with a perfect viewing angle, would absolutely render a positive watching experience.

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