This is the only device in the E-book Reader Matrix
Larger Devices table with 8 grey scales. This is a strange choice for such an expensive device, so there must be a technical reason. The Marvell ARMADA 166E has "Up to 1600x1200 display resolution support", but perhaps performance is degraded with 16 grey scales. Or perhaps the flexible backplane was not up to controlling 16 grey scales.