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Changes to Step #12

Edit by Andrew W.

Edit approved by Andrew W.

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[* black] Last to come off of the display is the [https://en.wikipedia.org/wiki/Backlight#LED_backlights|edge-lit LED backlight]—a common type of backlight found in smartphones.
[* icon_note] An edge-lit backlight, like the name suggests, only has LEDs on one edge of the backlight. Light from these diodes is spread evenly over the screen by the [https://en.wikipedia.org/wiki/Diffuser_(optics)|diffuser]—the multi-layer, semi-transparent plastic sheeting.
[* black] As mentioned earlier, the reflective mylar layer used to be one of the layers of the backlight.
[* black] In this iteration of the iPhone the mylar layer now serves two purposes; the new use, to obscure the 3D Touch sensors from view, and the traditional use, to reflect diffused light outward instead of [http://i.imgur.com/KyMbMPv.jpg|wasting lightlight|new_window=true] on the internals of the iPhone.
[* black] In this iteration of the iPhone the mylar layer now serves two purposes; the new use, to obscure the 3D Touch sensors from view, and the traditional use, to reflect diffused light outward instead of [http://i.imgur.com/KyMbMPv.jpg|wasting lightlight|new_window=true] on the internals of the iPhone.