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By: Neil Ball, Tue Nov 4th, 2008
A standard PAL television will refresh the picture at a frequency of 50Hz.The Frames Per Second (FPS) are the number of frames required to create the illusion of movement. Our eyes are often aware of this frequency depending on the speed of the moving image, the intensity of darkness, and the level of brightness hence you will sometimes notice the picture flicker on a 50Hz Television. Additionally the bigger the screen is the more noticeable the flicker is. At 100 Frame Per Second (100Hz) a TV operates at twice the Frames Per Second by creating a duplicateof each frame and putting it after the one before. On a 50 FPS (50Hz) Cathode Ray Television (CRT) because the picture was created with an charged particle scan there was a visible flicker that is seen by the human eye. By doubling the scan frequency to 100 Frames Per Second and inserting a copy frame this effect was eliminated as far as the human eye is concerned. The outcome of this is to appreciably reduce the flicker. LCD and Plasma TVs dont have flickering since they dont generate the picture with an electron scan. However LCD TVs still benefit from 100FPS since complex digital circuitry creates an extra frame or middle image. The TV does this by inventing an additional frame using complex interpolation as well as motion compensation calculations to calculate what the extra fields and frames look like instead than inserting a replica frame. (e.g. the first and second frames differ). Yet even at 100Hz the picture produced is still not a entirely smooth picture especially with fast motion images. A number of TV manufactures attempt to reduce this further by using digital picture processing. In reality there is still some blurring on rapidly moving images but the advantages are smoother movement, sharper pictures, and clearer and better defined surfaces than is possible from 50 FPS Plasma and LCDtelevisions. i.e. if a football travels ten pixels from right to left between frames one, two and three, the 100 FPS television will digitally create two further frames between one and two, and two and three, in which the ball will travel five pixels. This results in a total of five frames in which the football travels a total of ten pixels i.e. the initial frames one, two and three plus the digitally created frames inserted in between one and two, and between two and three. The result of this is that the human eye sees an picture that moves more fluidly than before. 100Hz TVs have a clear benefit of ending the majority ghosting artifacts occasionally seen in LCD TVs. The ghosting artifact caused by the next image being displayed before the preceding one has faded away. Click the following link for the finest discounts on 100 hertz televisions http://www.digitaldirect.co.uk A range of 200 hertz TV'shave been produced by Sony which digitally inserts three additional frames between the original 50 hertz frames. So high-speed moving sequences are seen with a more fluid, smoother and sharper picture than 50Hz or even 100 hertz televisions. For the finest advice and lowest prices look at http://www.digitaldirect.co.uk The majority of manufacturers have now got 100 hertz Plasma and LCD televisions including JVC, Panasonic, Toshiba, Samsung, LG, Philips, Sony,Pioneer and Hitachi . Studies has show that 100Hz televisions can help avert seizures in people who suffer with photosensitive epilepsies when watching television or playing computer games.