How bright a screen can be seen in the sun?

At present, the brightness of LCD screen produced by large factories is about 400nits, while it is 2000nits when the sun is strong. Therefore, the general LCD screen, mobile phone, monitor and TV set are basically invisible in the sun, especially when the sun is direct. If you want the LCD to display in the sun, you need to have a brightness of about 2000 nits.