
The info comes from LED Inside citing sources in the Apple supply chain. As you might guess from a site with that name, it seems like Apple is targeting the LED backlight components as a potential point to shrink the iPhone 6. The idea is that Apple will start using a new 0.4mm side-view type LED panel, which is 0.2mm thinner than the LED panel used in the iPhone 5s. Similarly, Apple may be switching the next iPad to a 0.6mm side-view type LED, which again is 0.2mm thinner than the panel used in the iPad Air.
0.2mm may not sound like much, but it can add up over a larger surface like the 9.7-inch iPad display, or the supposed 4.7-inch iPhone 6 display. And, that is the other part of the news. LED Inside is also saying that the next iPhone will feature a 4.7-inch display, which matches various other reports we've heard. The details get a bit scarce here, but supposedly Apple has also found a way to offer a "much lighter frame" for the device in order to offset the larger screen size.
source: LED Inside via BGR