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This is the layer that ensures the even, planar spreading of the backlight around the LCD.

The backlight is emitted from the strip of LED's that all seem to have around 3volts voltage drop across each LED. In total the backlight LED strip requires around 16volts, supplied through a three-pin connector by a some sort of switching power source.

Apparently, there are two separate ground rails and a common Vcc, each operating half of the LED strip. These are possibly connected in parallel.

To see LOCA stains clearly, you need to be looking at the pieces from the correct angle (second picture).

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