What does the nit of screen brightness mean What are HBM brightness and typ brightness?

Nit is a common screen brightness unit, known as nits, also known as "candela per square meter (cd/m²)", which represents the luminous intensity that a surface light source can provide.
Generally speaking, the screen with the highest brightness above 400nit can be used in the sun, and the screen with the highest brightness above 500nit can easily see the content in the sun.
Dued to mobile phones are generally carried and used in various occasions, most smart phones are equipped with light sensors that can automatically adjust the brightness of the phone according to the ambient brightness.
HBM brightness refers to the maximum brightness that the screen can provide in a strong light environment. Generally, it is the brightness that the mobile phone automatically triggers the sunlight screen mode under outdoor sunlight.
Usually using high brightness is not only more dazzling, but also consumes high power. The brightness of the screen that can be manually adjusted in a normal environment is called standard brightness, or typ brightness.
Some models also support the enhancement of the screen brightness in the highlights of the screen when playing certain HDR videos with the video content to show better visual effects. For example, the figure below shows the screen parameters of Mi 10.