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The Difference Between 720p and 1080i

Similarities and differences between 720p and 1080i

720p and 1080i are HD video resolution formats, but the similarities end there. The differences between the two affect the TV you buy and your viewing experience.

This information applies to televisions from various manufacturers, including but not limited to televisions from LG, Samsung, Panasonic, Sony, and Vizio.

Video Resolution Table: 480i to 1080p.
Wizard via Wikimedia Commons – Public Domain

What is 720p?

720p is an image with 720 lines of 1280 pixels. 720 horizontal lines or rows of pixels appear gradually on a TV or other display device, or each row or row is sent after the other (hence the “p”). The entire image is updated every 60 seconds (or twice every 30 seconds). The total number of pixels displayed over the entire surface of a 720p display is 921,600 (slightly less than 1 megapixel in digital cameras).

what is 1080i

1080i is an image with 1,080 lines of 1,920 pixels. All odd rows or rows of pixels are sent to the TV first, followed by all even rows or rows of pixels. Because 1080i is interlaced, only 540 lines (or half the details) are sent every 60 seconds, and all details are sent every 30 seconds. 1080i produces more detail than 720p, but since most detail is only sent every 1/30th of a second instead of 1/60th of a second, fast-moving objects will experience slight interlacing artifacts that look like jagged edges or jagged edges edge.blur Light blur effect. The total number of pixels in a full 1080i signal, after interleaved lines or line binning, is 2,073,600. However, only about 1,036,800 pixels are sent every 60 seconds.

While the pixel count of a 720p or 1080i monitor remains the same relative to the screen size, the number of pixels per inch is determined by the screen size.

720p, 1080i and your TV

HDTV broadcasts from local TV stations, cable or satellite services are 1080i (eg CBS, NBC, WB) or 720p (eg FOX, ABC, ESPN). However, that doesn’t mean you’ll see these resolutions on an HDTV screen.

1080p (1920 x 1080 progressive lines or pixel lines) is not used for television broadcasts, but is used by some cable/satellite providers, Internet content streaming services, and is part of the Blu-ray Disc format standard.

Most TVs labeled 720p actually have a built-in pixel resolution of 1366×768, which is technically 768p. However, they are often advertised as 720p TVs. Not to be confused; all of these devices accept both 720p and 1080i signals. All the TV has to do is scale the incoming resolution to the built-in screen resolution of 1366 x 768 pixels.

Another important thing to note is that LCD (LED/LCD), OLED, Plasma and DLP TVs can only display progressive scan images; they cannot display a true 1080i signal.

Plasma and DLP TVs have been discontinued, but many are still in use.

If a 1080i signal is detected on any of the above types of TVs, you will need to upgrade the signal to 720p or 768p (if it is a 720p or 768p TV), 1080p (if it is a 1080p TV) or even 4K (if it is a 720p or 768p TV) . 4K Ultra HD TV).

1080p and 4K TVs upscale the screen display to 720p.

Because of scaling, the quality of the picture you see on the screen depends on how well your TV’s video processor is doing. When the TV’s processor is working properly, images from 720p and 1080i input sources will have soft edges and no visible artifacts.

A sign of poor processor performance is looking for jagged edges on objects in an image. This is most noticeable on incoming 1080i signals, as the TV’s processor only needs to upscale the resolution to 1080p or downscale it to 720p (or 768p), but it also has to perform a task called “de-interlacing”.

Deinterlacing requires the TV’s processor to combine the parity or pixel lines of an incoming interlaced 1080i image into a single progressive image that is displayed every 60 seconds. Some processors do it well, some don’t.

it boils down to

Don’t get bogged down in numbers and technical jargon. The important thing to remember is that there is no such thing as a 1080i LCD, OLED, plasma or DLP TV.

If these types of TVs are advertised as “1080i” TVs, this means that while you can input a 1080i signal, you will need to upscale the 1080i image to 720p or 1080p for on-screen display.

Whether you’re sending a 1080i signal to a 720p or 1080p TV, what you end up seeing on the screen is the result of many factors other than resolution, including screen refresh rate/motion processing, color processing, contrast, brightness, background video noise , and artifacts. , and video scaling and processing.

With few exceptions, 720p TVs have been relegated to 32-inch and smaller screens. You’ll also find more and more 1080p TVs at that screen size or smaller, but as 4K Ultra HD TVs become more affordable, so does the number of 1080p TVs on 40-inch and larger screens.

Content

The Difference Between 720p and 1080i

How 720p and 1080i are the same and different

720p and 1080i are both high-definition video resolution formats, but that is where the similarity ends. Differences between the two may affect the TV you buy and your viewing experience.

This information applies to televisions from a variety of manufacturers including, but not limited to, those made by LG, Samsung, Panasonic, Sony, and Vizio.
Video Resolution Chart – 480i to 1080p.
mage via Wikimedia Commons – Public Domain What 720p Is

720p is a picture containing 720 rows of 1,280 pixels. 720 horizontal lines or pixel rows appear on a TV or other display device progressively, or each line or row sent following another (that is where the “p” comes from). The entire image refreshes every 60th of a second (or twice every 30th of a second). The total number of pixels displayed on the entire 720p screen surface is 921,600 (slightly less than 1 megapixel in digital camera terms).

What 1080i Is

1080i is a picture containing 1,080 rows of 1,920 pixels. All the odd lines or pixel rows are sent to the TV first, followed by all the even lines or pixel rows. Since a 1080i is interlaced, only 540 lines (or half the detail) are sent every 60th of a second, with all the detail sent every 30th of a second. 1080i produces more detail than 720p, but since the increased detail is only sent every 1/30th of a second, rather than 1/60th of a second, fast-moving objects will exhibit slight interlacing artifacts, which can appear to look like jagged edges or a slightly blurred effect. The total number of pixels in a complete 1080i signal, once both interlaced lines or rows are combined, totals 2,073,600. However, only about 1,036,800 pixels are sent every 60th of a second.

Although the number of pixels for 720p or 1080i screen display remains constant regards of screen size, the size of the screen determines the number of pixels per inch.
720p, 1080i, and Your TV

HDTV broadcasts from your local TV station, cable, or satellite service are either 1080i (such as CBS, NBC, WB) or 720p (such as FOX, ABC, ESPN). However, that does not mean you are seeing those resolutions on your HDTV screen.

1080p (1920 x 1080 lines or pixel rows progressively scanned) is not used in TV broadcasting, but is used by some cable/satellite providers, internet content streaming services, and is a part of the Blu-ray Disc format standard.

Most TVs that are labeled as 720p TVs actually have a built-in pixel resolution of 1366×768, which is technically 768p. However, they are usually advertised as 720p TVs. Don’t get confused; these sets will all accept 720p and 1080i signals. What the TV has to do is scale the incoming resolution to its built-in 1366×768 pixel display resolution.

Another important thing to point out is that LCD (LED/LCD), OLED, Plasma, and DLP TVs can only display progressively scanned images — they cannot display a real 1080i signal.

Plasma and DLP TVs have been discontinued, but many are still in use.

If a 1080i signal is detected on one of the above TV types, it has to scale that signal to either 720p or 768p (if it is a 720p or 768p TV), 1080p (if it is a 1080p TV), or even 4K (if it is a 4K Ultra HD TV).

1080p and 4K TVs upscale 720p for screen display.

As a result of scaling, the quality of the image you see on the screen depends on how well the TV’s video processor works. If the TV’s processor does a good job, the image will display smooth edges and have no noticeable artifacts for both 720p and 1080i input sources.

A sign that a processor is not doing a good job is to look for any jagged edges on objects in the image. This will be more noticeable on incoming 1080i signals as the TVs processor only has to scale the resolution up to 1080p or down to 720p (or 768p), but also has to perform a task called “deinterlacing”.

Deinterlacing requires that the TV’s processor combine the odd and even lines or pixel rows of the incoming interlaced 1080i image into a single progressive image to be displayed every 60th of a second. Some processors do this very well, and some don’t.

The Bottom Line

Don’t get bogged down with all the numbers and tech terms. The main thing to remember is that there is no such thing as a 1080i LCD, OLED, Plasma, or DLP TV.

If these types of TVs are advertised as a “1080i” TV it means that while it can input a 1080i signal, it has to scale the 1080i image to 720p or 1080p for screen display.

Whether inputting a 1080i signal on either a 720p or 1080p TV, what you end up seeing on the screen is the result of many factors in addition to resolution, including screen refresh rate/motion processing, color processing, contrast, brightness, background video noise and artifacts, and video scaling and processing.

With just a few exceptions, 720p TVs have been relegated to 32-inches and smaller screen sizes. You will also find a growing number of 1080p TVs in that screen size or smaller as well but with 4K Ultra HD TVs getting less expensive, the number of 1080p TVs in 40-inch and larger screen sizes are also becoming less numerous.

#Difference #720p #1080i

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