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How to turn off the high definition displayed on the mobile phone?

To turn off the HD displayed on your phone, you need to turn off VoLTE HD calling. Take MIUI system as an example. First, enter the setting interface of mobile phone, then select dual card and mobile network and click enter, then click the SIM card of mobile phone to enter the setting page, and finally close the button to enable VoLTE HD calling.

HD HD 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.

Popular size

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

Europe tends to 1920× 1090i/50.

Among them, 720p is the highest format, and the line frequency supports 45kHz, while the line frequency of 1080i/60Hz supports only 33.75kHz, and the line frequency of 1080i/50Hz requires less, only 28. 125kHz.

Reference to the above content: Baidu Encyclopedia-HD