What does HD mean?

HD is the abbreviation of English High Definition, which refers to an image or video 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 "high definition" is "high definition".

First, high-definition technology

HD HD is the Chinese abbreviation of English "High Definition", which means "high resolution". * * There are four meanings: high-definition TV, high-definition equipment, high-definition format and high-definition movie. DVD gives people unparalleled audio-visual enjoyment in the VCD era, but with the progress of technology and the continuous follow-up of people's needs, people put forward higher requirements for the quality of video. Generally, the format with physical resolution over 720p is called HD, and the English expression of HD is abbreviated as HD. Full HD refers to progressive scanning with a physical resolution of 1920× 1080, that is, 1080p HD, which is the top-level HD specification at present.

Second, common expressions

In our life, we often encounter shorthand representations such as 720p, 1080p, 1080i, where the previous numbers represent vertical resolution.

Third, popular size.

The Advanced Television Systems Committee of the United States has defined two popular HD sizes: 1280×720p/60 and1920x1080i/60, where the multiplication sign indicates the width (horizontal resolution) and the multiplication sign indicates the height (vertical resolution).

Frequently seen resolutions are 1280×720 and 1920× 1080, which is really a big test for the current display. If the resolution is further improved, it will be difficult to obtain better image quality on the existing display, because the bottleneck at this time lies in the display equipment. For screens below 32 inches, the resolution of 1920× 1080 has basically reached the resolution limit of human eyes for dynamic video clarity, which means that higher resolution can only show its advantages on large-screen displays. ?

(Source: HD-Baidu Encyclopedia)