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The picture on a tv screen is made of lines of pixels. In a conventional tv there are 625 lines - which are refreshed 25 times per second. Hd has either 720 or 1080 lines - so it produces a clearer sharper picture.

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1. The picture on a tv screen is made of lines of pixels. In a conventional tv there are 625 lines - which are refreshed 25 times per second. Hd has either 720 or 1080 lines - so it produces a clearer sharper picture.





 
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