I read that they use LEDs, but black isn’t really a color you can shine. It’s the lack thereof. When black is displayed on a monitor, the pixels are just left unlit. However, black seven-segment-displays turn noticeably blacker in activated regions.
In: Technology
Think about it like drawing on a mirror with a marker. The light is reflecting off the back and being blocked by the marker as it comes towards your eye. If it has an LED backlight it’s a flashlight behind glass.
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