What is the difference between 1080p and 1080i HDTV?

High -resolution TV (HDTV) is a welcome change compared to old standard analog TVs, but there is no confusion when it comes to choosing a unit. One of the most asked questions is what is the difference between 1080i and 1080p HDTV? The question itself mixes apples and oranges, but marketing led to most of the confusion.

There are two types of HD broadcasts: 720p and 1080i. The 720p broadcast uses a resolution of 1280 x 720 or a picture composed of 1280 pixels across and 720 pixels high. "P" in 720p means progressive scan, which means that the picture is painted from top to bottom in one pass, renewed (converted) 60 times per second.

broadcasting in 1080i uses a higher resolution of 1920 x 1080, which theoretically leads to a better image. However, "I" means interview . The interlaced images are painted in a two -band process. The first pass paints every other line, the second pass paints the skipped rows. Painting all lines takes 1/30 second or twice as long as progResive scanning signal. So while the resolution is higher, interlaced can create flashing and can also cause fast moving objects to look slightly blurred. For this reason, networks that broadcast high -resolution sports usually use 720p, while natural channels will tend to 1080i for richer resolution.

Any HDTV can display 720p and 1080i broadcasts, but converts signals to the native resolution of the set. For example, the HDTV 720p will take the 1080i signal and use the internal processing chip to reduce the 720p image. This is called scaling . Also, deinterlation signal 1080i and displays it in progressive scan mode. Manufacturers sometimes sell HDTV 720p as 1080i HDTV, simply because it supports 1080i, albeit by expanding the resolution.

and 1080p HDTV does not reduce the 1080i signal resolution. It only has to determine. Figure 1080i should thereforeLook a little better at 1080p HDTV, especially when comparing large screens. When watching 720p to 1080p HDTV, the signal is exceeded to a higher resolution of 1080p. Although this UP-conversion is likely to make a negligible difference in modest sizes, it reduces the pixels related artifacts that can be appreciated on larger displays.

There are no broadcasts in 1080p (1920 x 1080 in progressive scanning mode) and none of them was expected at any time. However, there are digital formats that can produce a real 1080p signal, including Blu-ray ™. Only 1080p HDTV can display Blu-ray ™ in its native full resolution format. Among the 1080p HDTV are also different models with different support modes. Newer models support 1080p/60, 1080p/30 and 1080p/24, with the second number is images per second. 1080p is also more convenient for gaming and using PC.

Therefore, 1080i video or broadcast mode. Technically there is nothing like "1080i HDTV" because allHDTVs are progressive scanning, not interlaced. This includes LCD and plasma flat screens and LCD, LCOS and DLP rear projection TVs. Only the Cathode rays (CRT) TVs are interleaved, and although the HDTV rear screening of the CRT has been discarded.

Some might ask why some manufacturers promote HDTV 720p as 1080i? The answer is marketing. When 1080p HDTVS came, renaming HDTV 720p to "1080i HDTV" was a smart move. 1080i was the price much lower than the comparable model 1080p, with many, not if most consumers, did not realize the difference. Some industrial pages now refer to "720p/1080i HDTV" to make them clearer.

Finally, if the consumer is satisfied with the HDTV 720p, he would not be asleep as "1080i" for the model. But if it is a 1080p HDTV that wants to, it will have to cough extra cash or buy an smallest display for the same price tag.