 TV was introduced into the UK in 1964 with colour transmission starting in 1967. The system known as PAL (phase alternating line) was developed by Telefunken in Germany. In the US a committee known as the National Television System Committee produced a standard in 1941 (the NTSC standard) that came to be used across most of Latin America and Canada with colour being introduced in 1953. This survived until the introduction of digital TV in 2009 standardised by the Advanced Television Systems Committee (ATSC). Standard definition digital TV still retains the 525 line/60 Hz resolution used by the NTSC system. 2 http://www.bbc.co.uk/historyofthebbc/collections/buildings/alexandra_palace.shtml Cable, Copper, Wireless and Fibre and the World of the Big TV Actually, to be pedantic, the visible scan lines for standard definition ATSC are 480, either interlaced or progressively scanned. ATSC high definition increases this to either 720 or 1080 with a 16 : 9 aspect ratio, closer to the natural field of view than a standard TV four by three aspect ratio. DVBT and DVB C and DVB S high definition is similar with a choice of 720, 1035, 1080 or 1152 scan lines. Given that the human eye only has a certain amount of resolution there would be little point in having an HDTV picture on a small screen. Resolution, however, becomes progressively more useful as screen sizes increase. Present large-screen displays are either plasma or LCD. Plasma screen use fluorescent phosphors with each pixel having a red, green or blue light source that can be varied in intensity to produce a full colour range. Fluorescent phosphors go dim over time though the degradation is usually sufficiently slow not to be noticeable and they are brighter and have a wider colour range than LCD but use more energy. 6.2 3DTV An example 3DTV product is the 'smart TV'3 introduced by Samsung in early 2011 with a viewable screen size of 59 inches. Similar LCD screen formats are available. All are remarkable thin, the LCD model having a depth of 0.3 inches. The product