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Difference between ordinary TV and HDTV

The main difference between ordinary TV and HDTV is that HD TV has a wider format picture on the TV screen. Also the picture in an HDTV is very sharp and much denser and clearer than in an ordinary TV picture.

HDTV 16:9 Vs 4:3 Standard aspect ratio
4:3 Vs. 16:9 Aspect Ratio

The picture on the right compares an Ordinary TV Vs HDTV picture. HDTV has a width to height ratio of 16:9 compared to a standard definition TV picture width to height ratio of 4:3. The width to height ratio of a TV is known as the aspect ratio. Thus in an HDTV of picture height of say 45 inches the width will be 80 inches. In a standard TV picture of the same height of 45 inches the width will only be 60 inches. So in our example here of a TV picture of same height of 45 inches, since the SDTV and HDTV aspect ratios are different, the SDTV produces a picture of only 60 inches wide compared to 80 inches width of the HDTV. Hence an HDTV picture is one third wider than a standard TV picture of same height.

The main benefit of HDTV over Ordinary TV picture is that the HDTV picture quality is very clear and much better than ordinary TV pictures. When HDTV picture is compared to ordinary TV picture, the HDTV picture quality is crisper and more detailed due to the higher resolution of HDTV. You do not see that grainy sort of picture like on the old ordinary standard definition TVs. HDTV has 1920x1080 pixel resolution compared to old CRT standard television pictures of 640x480 pixels. The wider picture of the HDTV is a pleasure to watch with less eye strain.

HD TV Screen Pixel size

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