A standard PAL television will refresh the picture at a frequency of 50Hz or 50 Frames Per Second (FPS). The Frames Per Second are the number of frames needed to create the illusion of movement. On a 50Hz Cathode Ray Television (CRT), because the picture was produced by an electron scan, there was a visible flicker that could be detected by the human eye.
Our eyes are often aware of this frequency of picture change depending on the level of brightness, the level of darkness, and the speed of the image movement, and therefore you will at times be aware of the picture flicker on a 50Hz Televisions. As the screeen size increases the more apparent the flicker is.
How 100 hertz used to work
A 100 FPS (100Hz) television operates at twice the Frequency by creating a copy of each frame and putting it after the one before. As a result of doubling the scan frequency to 100Hz and inserting a duplicate frame this effect is eliminated, as far as the eye is concerned. The consequence of this is to drastically lower the flicker.
Does 100hz improve the picture on 100hz Plasma and LCD televisions ?
LCD and Plasma televisions dont produce flickering because they don't produce the picture with an electron scan. However LCD TV's still benefit from 100Hz because advanced digital circuitry creates an extra frame or middle image. This is done by the TV inventing an extra frame using complex interpolation and motion compensation calculations to work out what the extra fields and frames look like rather than inserting a replica frame. (e.g. the second frame is not the same as the first frame).
However even at 100 FPS the picture still does not deliver a entirely smooth picture particularly with fast motion images. Some television manufactures attempt to reduce this further by employing digital picture processing. Typically there is still a little blurring on quick moving images but the benefits are clearer and better-defined surfaces, sharper pictures, and smoother movement than is possible from 50 Frames Per Second Plasma and LCD televisions.
For example if a football moves ten pixels from right to left between frames one, two and three, the 100Hz television will digitally generate two additional frames between one and two, and two and three, in which the ball will move five pixels. This results in five frames in which football moves a total of ten pixels i.e. the original frames one, two and three plus the digitally created frames inserted between one and two, and between two and three. The effect of this is that the eye sees an image that moves more smoothly than before.
100 hz is a benefit
100Hz televisions have the clear benefit of eliminating a lot of the ghosting effects occasionally seen in LCD TVs. Ghosting effects caused by the next image being shown before the earlier one has faded away. Even on Plasma tv the creation of the middle frame results in a more fluid picture
Manufacturers such as JVC, Panasonic, Samsung, Toshiba, LG, Sony, Philips, Hitachi and Pioneer have got 100 hertz Plasma and LCD televisions.
Sony lead the way into 200Hz
A new series of 200 hertz televisions have been launched by Sony which digitally inserts three additional frames between the original 50 hertz frames. Thus fast moving sequences are delivered with a smoother, more fluid and sharper picture than 50Hz or even 100 hertz TV's.
Additional benefit for photosensitive epilepsy sufferers
Research has proven that 100 hertz televisions can assist in preventing seizures in people who suffer with photosensitive epilepsies when viewing television or playing computer games.
Author Resource:-
Armadeus Cornelius is an Home Entertainment enthusiast and expert with nearly 2 decades experience in electronics. His website at www.digitaldirect.co.uk offers 100Hz and 200Hz TVs and a large selection of AV products at low prices. You may also find these links useful Televisions 100Hz and 37 LCD 100Hz TV
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