The light coming from LCD displays is different than single-color LEDs; that picture you linked isn’t a good representation of your phone&#x2F;laptop. LCD displays use a “white” LED backlight (= blue LED + broader-spectrum yellow phosphor), and the various subpixels have band-pass color filters for particular wavelengths.<p>Here’s a sketch of the basic idea:
<a href="https:&#x2F;&#x2F;dotcolordotcom.files.wordpress.com&#x2F;2011&#x2F;10&#x2F;filter-spectrum.jpg?w=1118&amp;h=640" rel="nofollow">https:&#x2F;&#x2F;dotcolordotcom.files.wordpress.com&#x2F;2011&#x2F;10&#x2F;filter-sp...</a><p>My quick google image search isn’t turning up any particularly good SPD graphs of real recent LCDs, but if you poke around you can surely find some.