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Changes to Step #12

Edit by Andrew W.

Edit approved by Andrew W.

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[* black] Backlight comingLast to come off of the LCD paneldisplay 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. It actually has an additional purpose in the display in this iteration of the iPhone:
[* black] 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 light] on the internals of the iPhone.
[* black] Backlight comingLast to come off of the LCD paneldisplay 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. It actually has an additional purpose in the display in this iteration of the iPhone:
[* black] 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 light] on the internals of the iPhone.