What everyone said is wrong. Nokia mentioned by the landlord is just a non-touch screen, which can be seen clearly. That's because the screen is translucent and semi-reflective, that is to say, you can see clearly by relying on the backlight in the dark and the reflection of external light in the bright place, even if the backlight is turned off. The screen that can't be seen clearly in the sun is a transmissive design, which can only be seen by backlight, but in strong sunlight, the backlight is too weak to see clearly.