Probably all three + economies of scale. Display panels are something like $15/unit, and initial fees for a panel with non-standard resolution can be in low mil

Probably all three + economies of scale. Display panels are something like $15/unit, and initial fees for a panel with non-standard resolution can be in low millions. I think you'll also be asked to purchase all productions of that panel unless there are other market demands for it. Most tablets don't even sell like Surfaces on rainy days, and it's hard to justify those fees and conditions.