Printhead module having a dropped row

1. A printhead module including a plurality of rows of printhead nozzles, at least some of the rows including at least one displaced row portion, the displacement of the row portion including a component in a direction normal to that of a pagewidth to be printed,

wherein the displaced row portions of at least some of the rows are different in length than the displaced row portions of at least some of the other rows.

2. A printhead module according to claim 1 , wherein the displaced row portion is disposed adjacent one end of the monolithic printhead module.

3. A printhead comprising a plurality of printhead modules, including at least one the printhead modules according to claim 2 , wherein the displaced row portion of at least one of the printhead modules is disposed adjacent another of the printhead modules.

4. A printhead according to claim 3 , wherein the printhead modules are the same shape and configuration as each other, and are arranged end to end across the intended print width.

5. A printhead according to claim 4 , the printead being a pagewidth printhead.

6. A printhead module according to claim 1 , wherein each of the rows has a displaced row portion, and the sizes of the respective displaced row portions increase from row to row in the direction normal to that of the pagewidth to be printed.

7. A printhead module according to claim 6 , wherein the dropped rows together comprise a generally trapezoidal shape, in plan.

8. A printhead module according to claim 6 , wherein the dropped rows together comprise a generally triangular shape, in plan.

9. A printhead comprising a plurality of printhead modules, including at least one of the printead modules according to claim 1 .

10. A printhead according to claim 9 , the printhead being a pagewidth printhead.

11. A printhead module according to claim 1 , including:

at least one row of print nozzles;

at least two shift registers for shifting in dot data supplied from a data source to each of the at least one rows, wherein each print nozzle obtains dot data to be fired from an element of one of the shift registers.

12. A printhead module according to claim 1 , in communication with a printer controller for supplying dot data to a printhead module having a plurality of nozzles for expelling ink, the printhead module including a plurality of thermal sensors, each of the thermal sensors being configured to respond to a temperature at or adjacent at least one of the nozzles, the printer controller being configured to modify operation of at least some of the nozzles in response to the temperature rising above a first threshold.

13. A printhead module according to claim 1 , in communication with a printer controller for outputting to a printhead module:

dot data to be printed with at least two different inks; and

control data for controlling printing of the dot data;

the printer controller including at least one communication output, each or the communication output being configured to output at least some of the control data and at least some of the dot data for the at least two inks.

14. A printhead module according to claim 1 , in communication with a printer controller for supplying print data to at least one printhead module capable of printing a maximum of n of channels of print data, the at least one printhead module being configurable into:

a first mode, in which the printhead module is configured to receive data for a first number of the channels; and

a second mode, in which the printhead module is configured to receive print data for a second number of the channels, wherein the first number is greater than the second number;

wherein the printer controller is selectively configurable to supply dot data for the first and second modes.

15. A printhead module according to claim 1 , in communication with a printer controller for receiving first data and manipulating the first data to produce dot data to be printed, the print controller including at least two serial outputs for supplying the dot data to at least one printhead.

16. A printhead module according to claim 1 , including:

at least one row of print nozzles;

at least first and second shift registers for shifting in dot data supplied from a data source, wherein each shift register feeds dot data to a group of nozzles, and wherein each of the groups of the nozzles is interleaved with at least one of the other groups of the nozzles.

17. A printhead module according to claim 1 being capable of printing a maximum of n of channels of print data, the printhead being configurable into:

a first mode, in which the printhead is configured to receive print data for a first number of the channels; and

a second mode, in which the printhead is configured to receive print data for a second number of the channels, wherein the first number is greater than the second number.

18. A printhead comprising a plurality of printhead modules according to claim 1 , the printhead being wider than a reticle step used in forming the modules, the printhead comprising at least two types of the modules, wherein each type is determined by its geometric shape in plan.

19. A printhead module according to claim 1 , for receiving dot data to be printed using at least two different inks and control data for controlling printing of the dot data, the printhead module including a communication input for receiving the dot data for the at least two colors and the control data.

20. A printhead module according to claim 1 , in communication with a printer controller for providing data to a printhead module that includes:

at least one row of print nozzles;

at least first and second shift registers for shifting in dot data supplied from a data source, wherein each shift register feeds dot data to a group of nozzles, and wherein each of the groups of the nozzles is interleaved with at least one of the other groups of the nozzles.

21. A printhead module according to claim 1 , having a plurality of nozzles for expelling ink, the printhead module including a plurality of thermal sensors, each of the thermal sensors being configured to respond to a temperature at or adjacent at least one of the nozzles, the printhead module being configured to modify operation of the nozzles in response to the temperature rising above a first threshold.