Here you can see a side view of the Super AMOLED display and front glass panel.

The Super AMOLED is attached to the front glass. The digitizer is a PET layer between the glass and the display.

You can definitely see that only the front glass panel is curved. The rest of the components are flat as a board, just as any other phone on the market.

Google describes it as a "...curved glass screen...", however that may be misconstrued to mean a curved Super AMOLED display, which is a bit misleading.

There's also a small PCB on the back of the display with an Atmel MXT224 touchscreen controller on it.