Viewing Angle and its Effects
October 10, 2008
Seasons vary from time to time and so does the seasons related to sports like cricket, football or any different categories, such as entertainment or conflicts. Among these lot, during the occasions related to entertainment everybody gets thrilled to watch programmes (on televisions) with their near and dear ones. It increases the enthusiasm in oneself. To experience the joy at the maximum, you always try to occupy the first seat or more often the centre seat to watch programmes more clearly. Side seats are usually avoided as the quality of the pictures is relatively dull due to an insufficient viewing angle. Viewing angle is a major concept pertinent to television viewing and the manufacturers keenly deal with it while designing their prodigal models.
What is Viewing Angle?
Viewing angle is defined as the maximum angle from where the pictures can be viewed clearly. It is measured from one direction to the opposite direction. The highest viewing angle of display screens is 180 degrees.
Viewing angle in Plasma and LCD TV
Plasma TVs have wide viewing angle as the screen emit the light directly from the pixels. Whereas in the case of LCD screens, pixels pass on the light further just from a single point. Hence the contrast and colour is lost. Plasma TV offer high contrast from any viewing angle, whereas LCD TV offer very less contrast ratio when viewed from more than 45 degrees. Viewing angle depends upon the fluid type inside the LCD screen.
General
A TV is considered to be the best performing one depending upon many factors of which, a factor of great importance is its viewing angle. In earlier days, programmes were watched from closer view and hence did not require greater viewing angles. Later, when the number of viewers increased and when the viewers spread across the room on either side of the screen, pictures were not visibly clear. This is because less light is reflected towards the sides. Viewing angle is measured both horizontally and vertically. To eliminate the problems caused due to narrow viewing angle, Optically Compensated Bend (OCB) liquid crystals are used. Viewing angle can be increased more than 170 degrees with OCB.
Some manufacturers give the measurement of viewing angle based on the contrast ratio when it exceeds 5:1 or 10:1. To achieve greater viewing angle horizontally and smaller angle vertically, the screens are aligned when both horizontal level and vertical level are different in magnitude.
Conclusion
Manufacturers must consider contrast ratio also when dealing with the viewing angle. Every manufacturer who is striving to come up in the market is at his best while trying to increase the viewing angles of his products. Better contrast ratio and viewing angles, not only increases the popularity of the LCD or plasma TVs in the market, but also the number of customers longing for that product.
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