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Digital Display

Digital Displays: A little more about High Definition

Last week, I made a simple point in this space, ie that just because a display device such as a plasma or LCD panel, is flat, does not mean that it is capable of displaying high definition content as part of digital signage messaging.

As a review of column last week, a panel of the screen can be standard definition or SD, ED or enhanced definition or high definition, high definition. Displays are composed of individual picture elements, called pixels. Basically, the idea is the more pixels, the higher the resolution of an image. Therefore, an SD screen with a pixel count of 704 (horizontal) x 480 (vertical) has less resolution than a screen with 852 x 480 pixels ED. high definition displays, which have more pixels and are at the top of the food chain for resolution displays, come in three flavors: 720p, 1080i and 1080p. (More on the "i" and "p" in a moment.)

A 720p high-definition screen has 1280 pixels (horizontal) by 720 (vertical) shows 1080i and 1080p is 1920 pixels by 1080 pixels, or more than 2 million individual picture elements. The letters "i" and "p" represent the progressive and interlaced, respectively. Interlaced displays, such as regular TV sets and HDTV 1080i, painting individual lines of pixels up and return and down the screen in the odd lines (in high definition televisions are the 1, 3, 5 … 1079) first and then The Evens (2, 4, 6 … 1080) before starting the process again and again. Overall, the odd number line "field" and the field of online peer to create a "frame", or full of still images. There are 30 frames per second as shown.

Progressive displays like computer monitors and HDTVs 1080p display lines in sequence (1, 2, 3 … 1080) before starting the process again. These displays 1080p HD paint 60 new images on the screen every second. With twice the frame rate (60 versus 30), 1080p requires twice the amount of data as 1080i.

This difference in frame rates means different things to different stakeholders HD. For sellers with a high definition display technology in a digital signage network, 1080p is the highest image quality-the-line they can expect to achieve in the foreseeable future. If the message you are communicating required the highest resolution, 1080p may be the right choice. However, 1080p screens are more expensive and not have to pay a price in terms of storage of content needed to drive the messaging.

For agencies broadcasters who must work within the law administered by the FCC for transmitting high-definition 1080p too. Just give what he has to work with, 1080p is beyond their ability to execute. Therefore, 1080i and 720p are HD transmission formats.

For movie studios that wish to make their movies in the highest display format available in the home, 1080p is the answer. Much of the buzz over Blu-ray and HD-DVD optical discs, in part, on capacity of the formats that compete to offer excellent image quality. The formats and use a blue laser with a shorter wavelength frequency that can write more data for storage area designed to be able to write all the 1080p data on the disk that is needed for the reproduction of a full length film, more extra material.

But here's the most important part of the equation of 1080p HD resolution: the public. If you are a seller of signaling Digital, a broadcaster or a movie studio, is facing the same question: What should I make available the same quality level that satisfies my audience my goal desired communication? In other words, how much is enough for the resolution of the communications task at hand?

Only you can answer to that question. To illustrate how the response is subjective, consider this: ABC, ESPN, Fox and My Network TV are based on 720, 720 or progressive lines, for the HD service, while NBC, CBS and PBS are based on 1080i. Perhaps before deciding what level of HD resolution is most appropriate for your network HD Digital Signage should switch between "ESPN Sportscenter HD (720p)," The Tonight Show with Jay Leno "(1080i) and" March of the Penguins "(1080p) playback from an HD-DVD player or "Mr. & Mrs. Smith" (1080p) from a Blu-ray in 1080p display. You may be surprised by what you see.

About the Author

David Little is a digital signage authority with 20 years of experience helping professionals use technology to expand their marketing messages with alternative media. Visit http://www.keywesttechnology.com and find how you can expand your marketing horizons. For further insight, download my free white paper Why Digital Signage Works. It gives a quick overview from an industry perspective on the fundamentals of digital signage. Included are some recently published findings by Neilsen Media Research on the measured impact of strategically placed digital signs. And while you are browsing our web site, sign up and take advantage of our free weekly Webinars that give you hands-on experience with our digital signage software.

“Digital Display” by Ready for the World

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