As far as I understand, you need to be able to mix red, green and blue light to get white light and replace lightbulbs. But the earliest example I can find of white LEDs used a blue LED and a yellow (apparently the result of mixing red and green light) phosphor coating to scatter the light across the visible spectrum. Why couldn’t something similar be done with a red LED and a cyan (mixing blue and green) coating/cover to produce white light instead?
In: Engineering
Our eyes specifically respond to 3 different colours. A particular blue, a particular green, and a particular red. If a colour comes in that isn’t exactly one of those colours, it’ll stimulate a combination of the rods in our eyes, and our brain will interpret it as that specific colour between A and B.
We can use that to trick our eyes. If we send the combination of red green and blue to your eyes, and they’re individually small enough points, our eyes can’t really distinguish between 3 specific lights of those colours, or one colour that is some proportion of all 3.
Once we got blue LED’s, we could use that to create panels of lights that use that trick to make the full colour spectrum available on a dynamic display.
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