Abstract: A fluid ejection device having an internal power supply path and a power regulator providing an offset voltage from the internal power supply path voltage. A self-calibration circuit in the inkjet printhead determines a regulation band of the power regulator defined by a lower set point offset voltage and an upper set point offset voltage. The inkjet printhead includes a group of nozzles, a corresponding group of firing resistors, and a corresponding group of switches controllable to couple a elected firing resistor of the group of firing resistors between the internal power supply path and the offset voltage to thereby permit electrical current to pass through the selected firing resistor to cause a corresponding selected nozzle to fire.

Abstract: A pixel cell is instructed to relay activation instructions to another pixel cell. The first pixel cell is instructed to activate. The activation instruction is relayed to the second pixel cell. The pixel cells are both activated.

Abstract: An embodiment of the invention is a display device including a plurality of pixels. The pixels in the display include an optical part. There is a digital-to-analog converter for driving the optical part. The digital to analog converter is physically co-located the optical part.