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What are the benefits of 100hz or 200hz on a Plasma or LCD Tv?
An Introduction to 50hz tv pictures
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.
The Human eye is at occasionally sensitive to this frequency depending on the intensity of darkness, the speed of the image, and the degree of brightness thus you will occasionally notice the picture flicker on a 50Hz TV. The flicker becomes more apparent on larger screen.
How 100 hertz technology originally worked
Originally 100hz (100 FPS) televisions operated at double the Frames Per Second by creating a duplicate of each frame and inserting it after the original one. By doubling the frequency of the scan to 100Hz and inserting a replica frame this effect was eliminated as far the human eye perceives it. The effect of this is to significantly reduce the flicker.
Does 100hz improve the picture on 100hz Plasma and LCD televisions ?
Plasma and LCD televisions dont produce flicker since they dont generate the picture with a scan. LCD TVs still benefit from 100FPS because sophisticated digital circuitry creates an additional frame or middle image. This is done by the TV creating an extra frame by means of complex motion compensation as well as interpolation calculations to calculate what the extra fields and frames look like rather than inserting a duplicate frame. (i.e. the first and second frames are different).
A 100Hz picture still does not produce a completely smooth picture especially with fast motion images. Some television manufactures further reduce this by using digital picture processing. In reality there is still some blurring on fast moving images but the benefits are clearer and better-defined surfaces, sharper pictures, and smoother movement than you get from 50Hz LCD screens.
e.g. For a football that travels ten pixels from left to right between frames one, two and three, the 100 hertz TV will digitally create two further frames between one and two, and two and three, between which the ball will move five pixels. This will result in five frames where the 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 in between two and three. The result of this is that the eye sees an image that moves smoother than before.
The benefits of 100 Hz
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
Most leading manufactures have now got 100Hz LCD and Plasma televisions including Panasonic, JVC, Samsung, Toshiba, Sony, Philips, LG, Pioneer, and Hitachi.
Sony lead the way into 200Hz
A range of 200hz TVs have been produced by Sony which digitally inserts three further frames between the original 50Hz frames. Hence speedy moving sequences are delivered with a more fluid, sharper and smoother picture than 50 hertz or even 100 hertz TVs.
Reduced seizures for people who have photosensitive epilepsies
Scientific studies have proven that for patients with photosensitive epilepsies 100Hz televisions can help prevent seizures when playing video games or watching Tv.
About the Author Armadeus Cornelius is an Home Entertainment enthusiast and expert with nearly 20 years experience in consumer electronics. His website at www.digitaldirect.co.uk offers 100Hz and 200Hz TVs and a large selection of AV products at rock bottom prices. Also look at these links Full HD LCD 100Hz and 100Hz Panasonic LCD
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