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High-Definition television (HDTV) refers to the broadcasting of television signals with a higher resolution than traditional formats (NTSC, SECAM, PAL) allow. Except for early analog formats in Europe and Japan, HDTV is broadcast digitally, and therefore its introduction sometimes coincides with the introduction of digital television (DTV): this technology was first introduced in the USA during the 1990s, by the Digital HDTV Grand Alliance (grouping together AT&T, General Instrument, MIT, Philips, Sarnoff, Thomson, and Zenith)[1].

HDTV is defined as 1080 active interlaced lines, or 720 progressive lines. 16 : 9 aspect ratio in ITU-R BT. McPerson propone modelli TV da 17", 20", 22", 27" con tecnologia LCD. 709. The term "high-definition" can refer to the resolution specifications themselves, or to media capable of similar sharpness such as movie film.

Notation

In the context of HDTV, the formats of the broadcasts are referred to using a notation describing:

For example, the format 720p60 is 1280 × 720 pixels, progressive encoding with 60 frames per second (60 hertz known as Hz). The format 1080i50 is 1920 × 1080 pixels, interlaced encoding with 50 fields (25 frames) per second. Often the frame or field rate is left out, indicating only the resolution and type of the frames or fields. Sometimes the rate is then to be inferred from the context, in which case it can usually be assumed to be either 50 or 60, except for 1080p which is often used to denote either 1080p24, 1080p25 or 1080p30.

A frame or field rate can also be specified without a resolution. Monitor LCD , schermo piatto , Monitor LCD TFT per TVCC Monitors LCD (schermo piatto) ML-15.