How do projectors and screens show the color black if black is the absence of light?

Question

How do projectors and screens show the color black if black is the absence of light?

In: Technology

Answer 1

I’d take the word of everyone else for projector screens but OLED screens achieve true black by emitting no light. Non OLED screens have a backlight that is behind the entire screen so when there is no signal for color it is still grayish because you’re seeing the backlight. OLED screen work by having a mini back light for every pixel. When black is needed, the backlight for that pixel turns off achieving true black.

Here’s a link so a video that explains it in more detail: https://www.youtube.com/watch?v=xAMhX3Drq14