Patent ID: 7090321

Claim:
A liquid drop discharge apparatus comprising: an ink-jet head control circuit including: a data storage unit, which respectively stores a first data block and a second data block following the first data block, for liquid drop discharge; a data conversion unit, which calculates a state transition data block based on the stored first and second data blocks, the data conversion unit outputing the state transition data block as a first value when the first data block is the same as the second data block and as a second value when the first data block is different from the second data block; and a first shift register, which receives the state transition data block from the data conversion unit and which serially outputs the state transition data block; and an ink-jet head module for discharging liquid drops through a plurality of nozzles, the ink-jet head module being in communication with the ink-jet head control circuit and including: a second shift register, which serially receives the state transition data block from the first shift register; a data storage unit, which stores the first data block; and a data conversion unit, which converts the received state transition data block into the second data block by determining that the second data block is the same as the first data block when the state transition data block has the first value and that the second data block is different from the first data block when the state transition data block has the second value; wherein the ink-jet head module discharges the liquid drops through the plurality of nozzles according to the second data block.