Here's a closer look at the assembly. The rightmost, thinner three panels are the color filter, polarizing filter, and diffuser. The leftmost, notched white panel is the reflecting back, the only one of the five elements that sits behind the row of LEDs (top).
Second from the left is the clear-looking, thicker "light guide," a proprietary Samsung development that uses a series of tiny lens-like refractors to send light from the LEDs along edges toward the middle of the screen. The company claims its edge-lit LED-based LCDs have the same uniformity characteristics as its standard backlit LCD displays. If true, that would be an improvement on the only other edge-lit display we've reviewed so far, the Sony KLV-40ZX1M.
Here's where we mention that, unlike so-called local dimming LED based displays we've reviewed in the past, these edge-lit models can't dim or turn off the LEDs selectively. That's why we expect that the black-level performance of edge-lit LED-based LCD displays won't match that of local dimming models, such as the Sony XBR8 or Samsung's own A950 series.