| 摘要 |
A printhead has a piezoelectric actuator and a driver circuit 100, the actuator having a first electrode 40 for receiving a common drive signal, and a second electrode 50 for use by a return path; the driver circuit includes a n-channel switching transistor 32 in an open drain configuration; the drain of the transistor 32 is connected to the second electrode 50 and the source is connected to the return path for the drive signal; when the transistor 32 is not conducting a voltage between the first 40 and second 50 electrodes is not affected by changes in the drive signal; a body diode or similar functionality diode 42 provides a conduction path to the substrate of the transistor 32 when a voltage between the electrodes exceeds a threshold. The transistor 32 is preferably an LDMOS transistor and the driver circuit may include a timing control circuit; a greyscale circuit or a logic lift circuit. |
