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Common screen dimensions are listed in the table below (the most common diagonal dimensions in inches as of 2020 are bolded). If the display is not listed, then the following equations can be used. Note that D is the diagonal (in centimeters or inches), W is the width (in pixels), and H is the height (in pixels).
Find the optimal distance for a given screen. Example: for a 4K UHD screen 140 cm high (112 inches diagonal), the optimal distance is 140 × 1.6 = 224 cm. Find the right screen size. Example: for a 1080 HDTV used at a distance of 250 cm, you need to find a screen whose height is close to 250 / 3.2 = 78 cm (63 inches diagonally).
It was estimated that as of April 2007, 28% of American households had an HDTV set, a total of 35 million sets, and that 86% of owners were highly satisfied with the HDTV programming [6] All TV stations at that time were broadcasting in both digital and analog and major networks broadcast in HD in most markets.
In 1950 a more efficient 2 + 1 ⁄ 2-inch (6.4 cm) tube with vastly improved technology and more efficient white phosphor, along with smaller and less demanding screen sizes, was able to provide an acceptable image, though the life of the tubes was still shorter than contemporary direct view tubes. [69]
As of 2016, most computer monitors use widescreen displays with an aspect ratio of 16:9, [5] although some portable PCs use narrower aspect ratios like 3:2 and 16:10 [6] while some high-end desktop monitors have adopted ultrawide displays. [7] The following table summarises the different aspect ratios that have been used in computer displays:
These may also use other aspect ratios by cropping otherwise black bars at the top and bottom which result from cinema aspect ratios greater than 16∶9, such as 1.85 or 2.35 through 2.40 (dubbed "Cinemascope", "21∶9" etc.), while the standard horizontal resolution, e.g. 1920 pixels, is usually kept.
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Digital Multimedia Broadcasting (DMB) is a digital radio transmission technology developed in South Korea [4] [5] [6] as part of the national information technology project for sending multimedia such as TV, radio and datacasting to mobile devices such as mobile phones, laptops and GPS navigation systems.
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