A printhead includes an address line, data lines, a fire pulse line, and a plurality of primitives, each primitive corresponding to a different data line and including a plurality of activation devices, each activation device corresponding to a different address of a set of addresses. A buffer receives data packets, each data packet including address data representative of an address of the set of addresses and print data for each primitive corresponding to the address. For each data packet, the buffer directs the address data to address logic and places the print data on the respective data line, and the address logic encodes the address represented by the address data onto the address line. For each primitive, the activation device corresponding to the address on the address bus activates a corresponding primitive function based on the corresponding print data when a fire pulse is present on the fire pulse line.

A recording apparatus includes a recording head including a plurality of ink discharge ports arranged in a predetermined direction, and a complementing unit configured to, according to discharge defect information identifying a defective discharge port at which a discharge defect has occurred among the plurality of ink discharge ports, determine to cause provision of complementary ink to be conducted from a different discharge port configured to discharge the ink at a different position from the identified defective discharge port, wherein the complementing unit determines to use a discharge port configured to provide the ink at a position on one side that is one of positions adjacent in the predetermined direction to a position at which the at least one discharge port provides the ink as the different discharge port for the discharge port identified as the defective discharge port.

A method for delivering a predetermined amount of fluid from a fluid ejection head. The method includes measuring one or more parameters selected from fluid flow parameters and electrical parameters for the fluid ejection head to provide one or more measured parameters; calculating a fluid ejection offset value from the one or more measured parameters; storing the fluid ejection offset value in a memory location on the fluid ejection head; accessing the fluid ejection offset value by an ejection head controller; and adjusting an amount of fluid ejected from the fluid ejection head during a fluid ejection step using the fluid ejection offset value to provide the predetermined amount of fluid from the fluid ejection head.

A printhead including an address line for communicating a set of addresses and a number of primitives, each primitive including a plurality of controllable activation devices coupled to the address line, each switch corresponding to at least one address of the set of addresses, each address corresponding to one of a number of primitive functions. A buffer receives a series of data packets, each data packet including address bits representative of one address of the set of addresses. Address logic receives the address bits PULSE POWER GROUND from the buffer, wherein for each data packet the address logic encodes the address represented by the address bits onto the address line, and wherein the at least one switch corresponding to the address activates the primitive function corresponding to address.

A method of determining calibration values for a media advance system of a page wide array printing device is described. A test pattern is printed on a calibration medium which advances along a media axis through the printing device. The test pattern comprises a plurality of test marks. The test pattern is scanned along a scan axis using a sensor and the calibration medium is advanced along the media axis through the printing device. The dimensions of the scanned test marks are analyzed, and calibration values are determined from the analyzed dimensions of the test marks. The scan axis is orthogonal to the media axis.

In one example in accordance with the present disclosure a flexible printhead is described. The printhead includes a number of printhead die, a printhead die including a number of nozzles to deposit an amount of fluid onto a print medium. The printhead also includes a fluid delivery system to deliver the amount of fluid from a fluid supply to the number of nozzles. The printhead also includes a number of electrical circuits to electronically couple the number of printhead die with a printing device. The printhead also includes a flexible substrate on which the number of printhead die and the number of electrical circuits are mounted.

An example provides a fluid ejection apparatus including a fluid feed slot to supply a fluid to a plurality of drop ejectors, a first rib at a first side of the fluid feed slot and supporting drop ejection circuitry to control ejection of drops of the fluid from the plurality of drop ejectors, and a second rib at a second side, opposite the first side, of the fluid feed slot supporting a thermal sensor to facilitate determination of a temperature of the first rib and the second rib.

In the method for controlling actuators, corresponding actuators are controlled so that they eject the ink droplets for the print image. Corresponding actuators are additionally controlled in order to eject refresh droplets in the image background according to a random distribution. In the event that no image droplet is printed between two successive refresh droplets, the ink meniscus is set into vibration as a refresh measure between the refresh droplets.

A printhead includes an address line, data lines, a fire pulse line, and a plurality of primitives, each primitive corresponding to a different data line and including a plurality of activation devices, each activation device corresponding to a different address of a set of addresses. A buffer receives data packets, each data packet including address data representative of an address of the set of addresses and print data for each primitive corresponding to the address. For each data packet, the buffer directs the address data to address logic and places the print data on the respective data line, and the address logic encodes the address represented by the address data onto the address line. For each primitive, the activation device corresponding to the address on the address bus activates a corresponding primitive function based on the corresponding print data when a fire pulse is present on the fire pulse line.

A method for printing on sheets in an inkjet process using nozzles includes transporting the sheets on a drum. When the nozzles are actuated by a computer, banding defects are compensated for and the computer factors in or takes into consideration thermal properties of the drum as it actuates the nozzles.