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The size of a screen is usually described by the length of its diagonal, which is the distance between opposite corners, typically measured in inches. It is also sometimes called the physical image size to distinguish it from the "logical image size," which describes a screen's display resolution and is measured in pixels. [1] [2]
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). Find the right video resolution. Example: a 53 cm high screen (43 inches diagonal), located at a distance of 300 cm, does not need to show video with a resolution higher than HD 720.
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The 2.1-inch (5.3 cm) Epson ET-10 [39] (Epson Elf) was the first color LCD pocket TV, released in 1984. [40] In 1988, a Sharp research team led by engineer T. Nagayasu demonstrated a 14-inch (36 cm) full-color LCD display, [ 34 ] [ 41 ] which convinced the electronics industry that LCD would eventually replace the CRT as the standard television ...
A common size for LCDs manufactured for small consumer electronics, basic mobile phones and feature phones, typically in a 1.7" to 1.9" diagonal size. This LCD is often used in portrait (128×160) orientation. The unusual 5:4 aspect ratio makes the display slightly different from QQVGA dimensions. 160×128 (20k) 160 128 20,480 5:4 UNNAMED UNNAMED
Under this revised system, television programming would continue to fall into one of the six ratings categories (TV-Y, TV-Y7, TV-G, TV-PG, TV-14 or TV-MA), but content descriptors would be added to the ratings where appropriate, based on the type(s) of objectionable content included in the individual program or episode: D (suggestive dialogue ...
The diagonal screen size of a CRT television is limited to about 100 cm (40 in) because of size requirements of the cathode-ray tube, which fires three beams of electrons onto the screen to create a viewable image. A large-screen TV requires a longer tube, making a large-screen CRT TV of about 130 to 200 cm (50 to 80 in) unrealistic.
In 1981, United Video Satellite Group launched the first EPG service in North America, a cable channel known simply as The Electronic Program Guide.It allowed cable systems in the United States and Canada to provide on-screen listings to their subscribers 24 hours a day (displaying programming information up to 90 minutes in advance) on a dedicated cable channel.
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