Hi Lautaro, about 3 hours ago I sent you a comment that I don't know if I wrote it in the corresponding box. Regarding the same I tell you that the first lamina that goes over the LEDs, the thick white one acts as a diffuser of all the LEDs and must go with the rough part towards the LEDs, but does not fulfill this function.
You will not have misplaced the sheets? First goes the thick white sheet, with the rough side towards the LEDs, then the thick polarized sheet with the side that looks double towards the LEDs (if you place your hand behind it looks double, if you turn it it looks simple), then Go the thinner polarized sheet with the side that looks double towards the LEDs, then go the thin semi-transparent sheet with the rough side towards the screen and finally the screen.