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RLCD is old and poor. Often poor contrast and shiny screens.
Blue light is an overstated issue. Shiny / Reflective screens is the biggest issue. On a top Apple there is now a matte option for an insulting to intelligence approx $200 more.
Some LCD (and indeed eink front lights) use cheap white LEDs (there is no true white LED, they use Blue/Violet/UV with phosphors, especially yellow) and these often have a magenta or blue cast.
A big issue is that people often have the brightness too high indoors. It's the content rather than light colour that has the biggest influence on holding off sleep.
The only aftermarket matte I ever saw working was black mesh or spray on for relatively low resolution CRTs.
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