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.
Black digits like on an old calculator? Those are early liquid crystal displays. When unenergized light passes through the segment. When energized the crystals align to block the ambient light from passing through. They don’t emit black. They just block light from passing.
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