Light Spectra for the iPad mini 4 - iPad Air 2 - iPad Pro    

The Backlights for LCD displays are white LEDs, which are made by using a Blue LED together with a yellow phosphor to transform some of the light for the Red and Green primaries. The spectrum of an LCD display is just the spectrum of its white LED Backlight filtered through the individual Red, Green and Blue sub-pixel filters within the LCD panel, resulting in broad rolling spectra for LCDs.

Light Spectra for each of the displays
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Article Links
iPad 2015 Display Technology Shoot-Out Article
Mobile Display Shoot-Out Article Series Overview and Home Page