Patent ID: 8042897
Filing Date: 2011-10-25
Classification: B41J

Abstract:
1. A method for compensating a shift in an ON resistance of a transistor in a chip of a printhead of an inkjet printer, the method comprising: determining a value of a life indication parameter of the printhead, wherein the life indication parameter is a number of pages printed by the printhead; comparing the determined value of the life indication parameter of the printhead with at least one predetermined value of the life indication parameter of the printhead, wherein the at least one predetermined value of the life indication parameter of the printhead is stored in at least one of a memory of the inkjet printer and a memory of the chip of the printhead; and increasing a voltage level supplied as input to a gate of the transistor as a difference between the determined value of the life indication parameter and the at least one predetermined value of the life indication parameter of the printhead get closer to one another over the life of the printhead, thereby compensating for the shift in the ON resistance of the transistor.