Patent ID: 7681992
Filing Date: 2010-03-23
Classification: B41J

Abstract:
1. A printhead element substrate having a plurality of electrothermal transducers and a plurality of switching elements provided in correspondence with the plurality of electrothermal transducers to drive the electrothermal transducers, comprising: an electrothermal transducer selection circuit which receives a print data signal and a block enable signal to divide the plurality of electrothermal transducers into a plurality of blocks, and selectively and time-divisionally drive the blocks and outputs a driving signal; a level converter which is provided for a set of a plurality of switching elements corresponding to adjacent electrothermal transducers and steps up the input driving signal; and a selection circuit which selects, from the adjacent switching elements on the basis of an externally input selection signal, a supply destination of the driving signal output from the level converter.