Printhead having printhead modules vertically offset at join region

1. A printhead comprising:

a first and second elongate printhead modules, the printhead modules being disposed end to end on either side of a join region, wherein the first printhead module and the second printhead module are vertically offset at the join region; and,

at least first and second printer controllers configured to receive print data and process the print data to output dot data for the printhead,

wherein the first printer controller outputs dot data to both the first printhead module and the second controller; and the second printer controller outputs dot data to the second printhead module, wherein the dot data output by the second printer controller includes dot data generated by the second printer controller and at least some of the dot data received from the first printer controller.

2. The printhead as claimed in claim 1 , wherein the vertical offset is a growing vertical offset which increases with each join.

3. The printhead as claimed in claim 1 , wherein at least one of the printhead modules is angled.

4. The printhead as claimed in claim 3 , wherein the at least one printhead module is on a mild slope.

5. The printhead as claimed in claim 4 , wherein the angle of the mild slope is dependent on the width of the printhead.

6. The printhead as claimed in claim 1 , wherein one or more printhead modules have redundant nozzle rows.

7. The printhead as claimed in claim 6 , wherein redundancy is present on a per-color basis.

8. The printhead as claimed in claim 7 , wherein there is more than one additional row for redundancy per color.

9. The printhead as claimed in claim 6 , wherein the nozzles in the redundant rows print dots for positions where a nozzle in a main row is defective.

10. The printhead as claimed in claim 6 , wherein the redundant nozzle rows are provided for only some nozzle rows of the one or more printhead modules.