A print head drive circuit drives a print head including an ejecting portion ejecting a liquid in response to a drive signal propagating through a drive signal line and a storage portion storing ejecting portion-related information changing in accordance with use of the ejecting portion, in which processing of reading the ejecting portion-related information changing in accordance with the use from the storage portion is performed before the drive signal for ejecting the liquid from the ejecting portion is supplied to the print head.

An integrated circuit to drive a plurality of fluid actuation devices includes an ID line, a fire line, a discharge path, a memory element, and a latch. The memory element is electrically coupled to the fire line and the discharge path. The latch disables the discharge path in response to a first logic level on the ID line and enables the discharge path in response to a second logic level on the ID line.

An example provides a fluid ejection apparatus including a fluid feed slot along a length of a print head die of the fluid ejection apparatus to supply a fluid to a plurality of drop ejectors, control circuitry adjacent to at least one side of the fluid feed slot to control ejection of drops of fluid from the plurality of drop ejectors, and a single power supply connector at an end of the print head die to supply power to the control circuitry.

A control method of a liquid discharging apparatus includes: a discharge inspection step of inspecting discharge abnormality of a nozzle by a discharge inspection mechanism; a remaining oscillation inspection step of inspecting oscillation of the ink inside a pressure chamber by a oscillation inspection circuit when the discharge abnormality is detected; a first correction step of performing correction which corresponds to the attachment of the resin inside the pressure chamber with respect to the driving pulse when abnormality is detected in oscillation; a re-discharge inspection step of inspecting the discharge abnormality of the nozzle after the first correction step; and a second correction step of performing the correction which corresponds to the attachment of the resin inside the nozzle with respect to the driving pulse when the abnormality is not detected in the oscillation in the oscillation inspection step or when the discharge abnormality is detected in the re-discharge inspection step.

In some examples, a controller of a printbar or a printhead copies firing instructions assigned, over a first network, to a plurality of shift registers, to a plurality of parallel registers and providing, over a second network, a primitive sequence including a respective firing order of each of a plurality of primitives included in the primitive sequence to the parallel registers.

A flow path structure which forms a flow path of liquid, includes: a light absorbing member (first substrate) having absorbing properties with respect to laser light; a light transmitting member (second substrate) which is joined to the light absorbing member and has transmitting properties with respect to the laser light; a first flow path (flow path) which is surrounded by a welding interface between the light absorbing member and the light transmitting member; and a second flow path which is formed in a flow path pipe (flow path pipe) which protrudes from a front surface opposite of the welding interface in the light transmitting member, and communicates with the first flow path, in which the flow path pipe is included in a region of the first flow path in a plan view from a direction orthogonal to the welding interface.

A memory cell includes an input coupled to a read line, an output coupled to a circuit ground, a bi-polar memristor, and at least one address switch coupled to an address line to select the memory cell. A memory includes the bi-polar memristor and a one-way current conducting device, wherein the one-way current conducting device is positioned between the memristor cell output and the circuit ground, or between the read line and the memristor cell input.

A piezoelectric device includes a diaphragm provided on a side of one surface of a substrate, and a piezoelectric actuator having a first electrode, a piezoelectric body layer, and a second electrode which are stacked in a first direction on a side of a surface opposite to the substrate of the diaphragm, in which when one area far from an end portion of the second electrode is a first area and one area near the end portion of the second electrode is a second area, of two areas of the second electrode in a second direction intersecting the first direction, the second electrode has a stiffness of 17,000 N/m or more in the second area in the first direction, which is higher than a stiffness in the first area in the first direction, and a length in the second area in the first direction is equal to or less than a length of the piezoelectric body layer in the second area in the first direction.

A liquid ejecting apparatus includes an ejecting unit and a drive circuit that generates the drive signal in accordance with a first voltage and a second voltage. The drive circuit includes a first pair of transistors, a second pair of transistors, and an integrated circuit that includes a first terminal to which the first voltage is applied, a second terminal to which the second voltage is applied, a first output terminal group which outputs a first control signal group for controlling the first pair of transistors, and a second output terminal group which outputs a second control signal group for controlling the second pair of transistors. The first terminal, the second terminal, the first output terminal group, and the second output terminal group are arranged along one side of the integrated circuit. The second output terminal group is disposed between the first terminal and the second terminal.

A liquid discharging apparatus includes a head unit which includes a discharge unit which discharges a liquid, a controller which controls discharging of the liquid, a plurality of first signal lines which connect the controller to the head unit, and at least one second signal line which connects the controller to the head unit, in which, the controller transmits the differential signal to the head unit via the first signal lines, and in which the head unit transmits the state signal in analog format to the controller via the second signal line.