Pixels and Screens: Why You Should Have a HDTV

When it comes to seeing videos in the comfort of one’s home the next best thing to having a full entertainment theater set-up is having a High Definition TV. Aesthetically, the slim screen does not require a lot of space, which is ideal for those living in small spaces like apartments and condo units. Moreover, if you would like to view videos that you have on your tablet, laptop or PC, you can use an HDMI cable and connect them with this TV and see everything on a bigger screen.


So, how do HD TVs show such crisp and clear pictures? It’s all about pixels. Computer monitors have actually caught up to digicams, with most of them displaying 1280 x 1024 pixels, equivalent to pictures produced by a one megapixel digicam. This is where high definition TV comes in. Most HDTV models display either 1920 x 1080 pixels or 1280 x 720 pixels, which are already similar to computer monitor levels. When compared to the SDTV, this equates to an HDTV showing close to six times more pixels, which equates to more detailed, smoother picture displays.
With more pixels, HDTV clearly edges out SDTV in quality viewing, which is why HDTV is the best choice. The increased number of pixels also results to HDTV pictures being shown on larger screen without them looking stretched. With SDTV, once the screen is bigger, the pixels that compose the picture have to be stretched out to occupy the extra screen area, which makes the pictures fuzzier or distorted altogether.


HDTV sets are also wider than their SDTV counterparts. Since SDTVs are host 704 x 480 pictures by default, the screen would need to fit the picture snugly as well. As mentioned above, an SDTV picture would look pixelated or stretched in a larger screen. If one is to force an SDTV to an HDTV screen and at the same time maintain the integrity of the 704 x 480 dimensions, then its edges would have to show blank spaces, just like when old movies are shown on TV. The ratio of the TV picture’s width and height is called the aspect ratio, which means HDTVs have higher aspect ratios, which in turn, translates to quality viewing, which is why HDTV is the best choice.


Lastly, HDTV also produces less or no flickering of images at all compared to SDTV sets. This is because SDTVs produces successive pictures to show on the screen through a process called interlacing, wherein odd-numbered lines of a picture are scanned, and after 1/60 of a second the even-numbered lines follow suit. So, a picture is completed after 1/30 of a second, which translates to 30 frames (1 frame = 1 complete picture scan) per second. These changing of frames, which can be slower than 30 frames/second at times, can be noticed by the corner of the eyes, which contain cones that are especially sensitive to light changes. This HDTV, which uses a process called progressive scanning to show one picture after another, changes a pictures at 60 frames for every seconds, which is twice quicker than SDTV units.



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