1080p vs 720p
So you are here for that big question: What is the difference between 1080p or 720 HDTV? And obviously then which is the better set for you? Well, if you already decided to get a 1080p or i HDTV, you can check out our sister site http://www.1080pvs1080i.com for that answer. But for 1080p vs 720p, let us begin:
What does the P stand for?
‘P’ stands for progressive scan or non-interlaced. Progressive scan will convey all of the lines of resolution sequentially in a single pass, which makes for a smoother, cleaner image, especially with sports and other motion-intensive content. Interlaced on the other hand will convey every other row in a single pass.
What is 720P
The number 720 stands for 720 lines of vertical display resolution, therefore 720P provide 1280×720 pixels of resolution.
What is 1080P
The number 1080 stands for 1080 lines of vertical display resolution, therefore 1080P provide 1,920×1,080 pixels of resolution. This format will display every pixel of the highest-resolution HD broadcasts. Also every pixel of the new Blu-Ray and HD-DVD formats.
So what is the difference?
Biggest difference is the resolution. You have more pixels in the 1080P vs the 720P format. This will provide more clarity allow you to get the most out of the next generation video games and Blu-Ray or HD DVD movies.
What does my local cable or satellite company provide?
Today’s high-def broadcasts are done in either 1080i or 720p, and because of bandwidth issues, we do not expect them to upgrade to 1080p in the near future. All HD sports broadcasts from Fox, ESPN, and ABC are in native 720p. Therefore for the majority of HDTV, 1080P will provide nothing in image quality that the 720p projectors don’t already give you.
How do Blu-Ray and HD-DVD fit in the picture?
Both players have titles release in the native 1080p source. Blu-Ray can output this as is, however the first generation of HD DVD players can only output the content at 1080i resolution. We expect future generations of HD DVD players to be able to output 1080P and catch up to the current Blu-Ray players. Also the new Playstation 3 game console will provide 1080P output.
Now to get another POV on this topic:
1080p vs 720p
1. What’s so great about 1080p?
1080p resolution–which equates to 1,920×1,080 pixels–is the current Holy Grail of HDTV resolution. That’s because most 1080p HDTVs are capable of displaying every pixel of the highest-resolution HD broadcasts. They offer more than twice the resolution of step-down models, which are typically 1,366×768, 1,280×720, or 1,024×768. These days, HDTVs with any of those three of lower resolutions are typically called “720p.” Nobody wants to remember all those numbers, and “768p” doesn’t really roll off the tongue.
2. How much extra does a 1080p TV cost?
When I wrote my original article two years ago, you had to pay a premium of about $1,000 to get a 1080p model at the same screen size as a “720p” set. In two years, the gap has closed somewhat, but in many cases, particularly when it comes to plasma, you have to pay significantly more for 1080p–usually anywhere from $500 to $800. Panasonic’s two 50-inch plasmas with antiglare screens are a good example. At Circuit City, the 1,366×768 (er, 720p) TH50PX77U costs $1,700 while the 1080p version, the TH50PZ77U, costs $2,500 (the two sets are otherwise nearly identical). The gap between same-size 720p and 1080p LCD TVs is typically narrower: at Amazon, the 1,366×768 Samsung LN-T4042H costs $400 less than its most affordable 1080p counterpart model, the LN-T4061F.
3. Why is 1080p theoretically better than 1080i?
1080i, the former king of the HDTV hill, actually boasts an identical 1,920×1,080 resolution but conveys the images in an interlaced format (the i in 1080i). In a tube-based television, otherwise known as a CRT, 1080i sources get “painted” on the screen sequentially: the odd-numbered lines of resolution appear on your screen first, followed by the even-numbered lines–all within 1/30 of a second. Progressive-scan formats such as 480p, 720p, and 1080p convey all of the lines of resolution sequentially in a single pass, which makes for a smoother, cleaner image, especially with sports and other motion-intensive content. .
4. What content is available in 1080p?
Today’s high-def broadcasts are done in either 1080i or 720p, and there’s little or no chance they’ll jump to 1080p any time soon because of bandwidth issues. Even the much-vaunted high-def games on the Xbox 360 and the PlayStation 3 are usually 720p native (if not less), though they can be upscaled to 1080i or 1080p in the user settings of those consoles. Really, the only commercially available way to get true 1080p output–aside from hooking your PC to your HDTV–is to get a Blu-ray or HD DVD player. All Blu-ray players and some high-end HD DVD models support 1080p output, and–more importantly–the vast majority of discs are natively encoded at 1080p. .
5. What kinds of TV technologies offer 1080p resolution?
These days, everything but CRT (tube) TVs comes in 1080p versions. That means you can find 1080p-capable versions utilizing all fixed-pixel technologies, including microdisplays (DLP, LCoS, and LCD rear-projection/front-projection) and flat-panels (plasma and LCD). Of course, as specified above, more affordable entry-level models are still limited to 720p resolution. But whatever the resolution, all fixed-pixel (non-CRT) TVs are essentially progressive-scan technologies, so when the incoming source is interlaced (1080i, or even good old-fashioned 480i standard-definition), they convert it to progressive-scan for display. . At this point, I could just expand on that last point and specify that all fixed-pixel display TVs–all microdisplay rear-projection and all flat-panels–always display everything at their native resolution, which is all they can display. On a 720p TV, that means that all incoming video is displayed at 720p (or 768p, as the case may be); on a 1080p TV, all incoming video is displayed at 1080p. The process of converting resolution is called scaling–sometimes called upconverting or downconverting. A related factor is deinterlacing (see point no. 8, below). How well a TV does or does not handle both of these processes is a big factor in how desirable it is–and something that casual shoppers often overlook, since, compared to the screen size or resolution, it’s not as easy to show as a spec sheet bullet point.
I should probably put that whole previous paragraph in bold, though, because the message never seems to get through. So, at the risk of overkill, let’s restate it with specific resolutions:
6. What happens when you feed a 1080i signal to a 720p TV?
The 1080i signal is scaled, or downconverted, to 720p. Nearly all recent HDTVs are able to do this.
7. What happens when you feed a 1080p signal to 720p TV?
Assuming the TV can accept a 1080p signal, it will be scaled to 720p. But that caveat is important: many older 720p HDTVs–and yes, even some older 1080p models–cannot even accept 1080p signals at all, in which case you’ll get a blank screen. Thankfully, most newer HDTVs can accept 1080p signals.
8. What happens when you feed a 1080i signal to a 1080p TV?
It’s converted to 1080p with no resolution conversion. Instead, the 1080i signal is “de-interlaced” for display in 1080p. Some HDTVs do a better job of this de-interlacing process than others, but usually the artifacts caused by improper de-interlacing are difficult for most viewers to spot.
9. Side by side, how do 720p and 1080p TVs match up in head-to-head tests?
We spend a lot of time looking at a variety of source material on a variety of TVs in our video lab here at CNET’s offices in New York. When I wrote my original article two years ago, many 1080p TVs weren’t as sharp as they claimed to be on paper. By that, I mean a lot of older 1080p sets couldn’t necessarily display all 2 million-plus pixels in the real world–technically, speaking, they couldn’t “resolve” every line of a 1080i or 1080p test pattern.
That’s changed in the last couple of years. Most 1080p sets are now capable of fully resolving 1080i and 1080p material. But that hasn’t altered our views about 1080p TVs. We still believe that when you’re dealing with TVs 50 inches and smaller, the added resolution has only a very minor impact on picture quality. On a regular basis in our HDTV reviews, we put 720p (or 768p) sets next to 1080p sets, then feed them both the same source material, whether it’s 1080i or 1080p, from the highest-quality Blu-ray and HD DVD players. We typically watch both sets for a while, with eyes darting back and forth between the two, looking for differences in the most-detailed sections, such as hair, textures of fabric, and grassy plains. Bottom line: It’s almost always very difficult to see any difference–especially from farther than 8 feet away on a 50-inch TV.
I said so much in a 2006 column I wrote called The case against 1080p, but some readers knocked us for not looking at high-end TVs in our tests. But the fact is, resolution is resolution, and whether you’re looking at a Sony or a Westinghouse, 1080p resolution–which relates to picture sharpness–is the same and is a separate issue from black levels and color accuracy.
Our resident video guru, Senior Editor David Katzmaier, stands by what he said two years ago: The extra sharpness afforded by the 1080p televisions he’s seen is noticeable only when watching 1080i or 1080p sources on a larger screens, say 55 inches and bigger, or with projectors that display a wall-size picture. Katzmaier also says that the main real-world advantage of 1080p is not the extra sharpness you’ll be seeing, but instead, the smaller, more densely packed pixels. In other words, you can sit closer to a 1080p television and not notice any pixel structure, such as stair-stepping along diagonal lines, or the screen door effect (where you can actually see the space between the pixels). This advantage applies regardless of the quality of the source.
10. OK, so what’s the bottom line: Should I go 1080p or 720p?
First and foremost, some people just want what’s considered the best spec on a TV. If you’re one of those people, spend the extra dough, you’ll feel better in the long run. Secondly, if you’re thinking of going big, really big (a 55-inch or larger screen), or you like to sit really close (closer than 1.5 times the diagonal measurement), the extra resolution may make it worth the difference–as long as you have a pristine, 1080i or 1080p HD source to feed into the set. And finally, it’s a good idea to go with 1080p if you plan to use your TV a lot as a big computer monitor. That said, if you set your computer to output at 1,920×1,080, you may find that the icons and text on the screen are too small to view from far away (as a result, you may end up zooming the desktop or even changing to a lower resolution). But a 1080p set does give you some added flexibility (and sharpness) when it comes to computer connectivity.
If none of those factors jump out at you as true priorities–and you are working on a tight budget and want to save some dough–a 720p set is going to do you just fine. HD will still look great on your set, I swear. In fact, our current highest-scoring HDTV, the Pioneer Kuro PDP-5080HD, is a 720p, er–768p, model.
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Here is an great Youtube video that I found that has some good explantations on 1080p, 1080i, 720p, and LCD and Plasma technologies (which is a whole other ballgame). View and enjoy.
