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I think, although I'm not entirely sure, that LED backlights work in one of two ways. Either there's a white LED that is behind red, greed, and blue filters, or there are separate red, green, and blue LEDs. In the former case, the filters are likely to reduce short-wavelength light and, in the latter, case, the red and green LEDs would be inherently safe and the blue LED would most likely be selected to be longer-wavelength for efficiency reasons.

(IIRC blue and violet LEDs are close to 100% efficient, but our eyes are much more sensitive as the wavelength gets farther from violet. This means that the "efficacy" of less violet LEDs is much higher. The backlight power will be set to achieve some desired apparent brightness, so a longer-wavelength blue primary would save power.)

I wonder what OLED would be like

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