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HD is the abbreviation of English High Definition, which refers to images or videos with a vertical resolution greater than or equal to 720, also known as high-definition images or high-definition videos. The sizes are generally 1280×720 and 1920×1080. The full name of "HD" is "High Definition".


HD technology

HD is the Chinese abbreviation of "High Definition" in English, which means "high resolution". There are four meanings: HD TV, HD equipment, HD format, and HD movies. DVD has given unparalleled audio-visual enjoyment in the VCD era, but with the advancement of technology and the continuous follow-up of human needs, people have put forward higher requirements for the various qualities of video. 

Usually, the format with a physical resolution of 720p or higher is called HD. The English term High Definition, referred to as HD, is the so-called Full HD, which refers to the progressive scan with a physical resolution of up to 1920×1080, that is, 1080p HD, which is the top HD specifications.

Popular size

The American ATSC (Advanced Television System Committee) defines two popular HD sizes: 1280×720p/60 and 1920×1080i/60. The front of the multiplication sign indicates the width (i.e. horizontal resolution), and the back of the multiplication sign indicates the height (i.e. vertical Resolution).

Europe tends to 1920×1090i/50.

Among them, 720p is the highest format, the line frequency support is 45kHz, while the line frequency support of 1080i/60Hz only needs 33.75kHz, and the line frequency requirement of 1080i/50Hz is lower, which is only 28.125kHz.

The HDTV resolutions that are often seen are 1280×720 and 1920×1080, which are indeed no small tests for today’s displays. If the resolution is further improved, it will be difficult to obtain better results on existing displays. Picture quality, because the bottleneck at this time is the display device. For screens below 32 inches, the 1920×1080 resolution has reached the human eye's resolution limit for dynamic video clarity, which means that higher resolutions can only show advantages on large-screen displays.

Display format

HD has three display formats, namely: 720P (1280×720, non-interlaced, field frequency of 24, 30 or 60); 1080i (1920×1080, interlaced, field frequency of 60); 1080p (1920×1080, non-interlaced Interleaved, field frequency is 24 or 30).

Common expression

In life, we often encounter abbreviations such as 720p, 1080p, and 1080i, where the number in front indicates the vertical resolution.


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