Patent ID: 6971735

Claim:
An ink-jet printhead board comprising: an energy generation element for generating energy used to discharge ink; a driver circuit connected to the energy generation element to deliver a current for driving the energy generation element, the driver circuit comprising an enhancement NMOS transistor; a shift register for receiving recording data; a transmitting element for transmitting a signal to control the driver circuit to deliver the current to the energy generation element based on the recording data received by the shift register; and a logic circuit including at least the shift register and the transmitting element, configured to operate based on a logic signal voltage for operating the shift register, the logic circuit comprising an enhancement NMOS transistor, wherein a voltage threshold of the enhancement NMOS transistor of the logic circuit is lower than a voltage threshold of the enhancement NMOS transistor of the driver circuit, and wherein a drivability of the enhancement NMOS transistor of the logic circuit is higher than a drivability of the enhancement NMOS transistor of the driver circuit.