Head unit and liquid ejecting apparatus

A liquid ejecting apparatus comprising:

• a drive signal output circuit that outputs a drive signal corrected based on a temperature information signal;
• and
• a head unit that ejects a liquid by receiving the drive signal, wherein
• the head unit includes:
• a print head that ejects the liquid by receiving a logic signal and the drive signal;
• a temperature information output circuit that outputs the temperature information signal indicating a temperature of the print head;
• and
• a head substrate coupled to the print head,
• the print head includes:
• a piezoelectric element including a first electrode, a second electrode, and a piezoelectric body, having the piezoelectric body that is located between the first electrode and the second electrode in a stacking direction in which the first electrode, the second electrode, and the piezoelectric body are stacked, and driven by receiving the drive signal;
• a vibration plate located on one side of the piezoelectric element in the stacking direction and deformed due to drive of the piezoelectric element;
• a pressure chamber substrate located on one side of the vibration plate in the stacking direction and provided with a pressure chamber having a volume that changes due to deformation of the vibration plate;
• a nozzle for ejecting the liquid according to change in the volume of the pressure chamber;
• and
• a temperature detection section located on another side of the vibration plate in the stacking direction to detect head temperature information corresponding to a temperature of the pressure chamber and output the head temperature information as a head temperature signal,
• the logic signal is a signal for controlling ejection of the liquid from the print head,
• the temperature information output circuit outputs the temperature information signal based on the head temperature signal acquired during a period when a logic level of the logic signal does not change,
• the temperature information output circuit is provided on the head substrate,
• the head substrate includes wiring through which a residual vibration signal according to an ejection state of the liquid from the print head propagates, and
• in the head substrate,
• at least a part of wiring through which the logic signal propagates is located adjacent to at least a part of wiring through which the head temperature signal propagates, and
• wiring through which a ground signal propagates is located between the wiring through which the head temperature signal propagates and the wiring through which the residual vibration signal propagates.