There is provided a liquid droplet discharging control device for a liquid droplet discharging apparatus which includes a liquid droplet discharging head in which a plurality of nozzles discharging liquid droplets are formed, discharges liquid droplets while relatively moving the head and a medium in a direction intersecting a direction in which the nozzles are arranged. The liquid droplet discharging control device includes a controller that causes a first nearby nozzle, which discharges a dot adjacent to a dot row corresponding to a predetermined nozzle which is not capable of discharging a liquid droplet, to discharge a liquid droplet for a dot of a large size and that causes a second nearby nozzle, which is separated from the predetermined nozzle and discharges a dot adjacent to a dot row corresponding to the first nearby nozzle, to discharge no liquid droplet for a dot.

A liquid ejecting apparatus includes an ejecting unit that includes a piezoelectric element which is displaced by a first drive signal or a second drive signal; a first unit circuit that generates the first drive signal by using a first pair of transistors; a second unit circuit that generates the second drive signal by using a second pair of transistors; and an adjustment unit that delays at least one of a first control signal and a second control signal to supply the delayed control signal to a corresponding unit circuit, in a case where timing when a level of the first control signal for controlling the first pair of transistors changes and timing when a level of the second control signal for controlling the second pair of transistors changes are within a threshold time, and in a case where a predetermined condition is satisfied.

A liquid ejecting apparatus includes an ejecting unit that includes a piezoelectric element which is displaced by a drive signal, a differential amplifier that outputs a control signal based on a source drive signal which is a source signal of the drive signal and a signal based on the drive signal, a pair of transistors that include a high-side transistor and a low-side transistor which are controlled based on the control signal and outputs the drive signal from an output terminal, a selector that selects one of the high-side transistor and the low-side transistor and supplies the control signal to the selected transistor, a first resistance element having one terminal that is electrically coupled to the output terminal, and a second resistance element having one terminal that is electrically coupled to the output terminal.

A liquid ejecting apparatus includes an ejecting unit that includes a piezoelectric element which is displaced by a drive signal; a differential amplifier that outputs a control signal based on a source drive signal which is a source signal of the drive signal and a signal based on the drive signal; a pair of transistors that include a high-side transistor and a low-side transistor which are controlled based on the control signal and outputs the drive signal from an output terminal; a selector that selects one of the high-side transistor and the low-side transistor and supplies the control signal to the selected transistor; a first resistance element for pulling up the output terminal; and a second resistance element for pulling down the output terminal. The first resistance element or the second resistance element has a variable resistance value.

A liquid ejecting apparatus includes an ejecting unit, a differential amplifier, a pair of transistors, and a selector. The ejecting unit includes a piezoelectric element which is configured to be displaced by a drive signal being applied to the piezoelectric element. The ejecting unit is configured to eject liquid in accordance with displacement of the piezoelectric element. The differential amplifier is configured to output a control signal based on a source drive signal which is a source signal of the drive signal and a signal based on the drive signal. The transistors includes a high-side transistor and a low-side transistor which are configured to be controlled based on the control signal and are configured to output the drive signal from an output terminal of the transistors. The selector is configured to select one of the high-side transistor and the low-side transistor and supply the control signal to a selected transistor.

A drive circuit includes a control signal generator configured to generate a control signal based on a drive signal and a source drive signal, and an amplifier including a high-side transistor and a low-side transistor controlled based on the control signal. The amplifier is configured to output the drive signal from an output terminal to drive a capacitive load during a first period in which a voltage of the drive signal changes to be higher than or equal to a first voltage per unit time and a second period in which the voltage changes to be lower than the first voltage or does not change per unit time. The first period includes a period in which one of the high-side and the low-side transistors performs a switching operation. The second period includes a period in which the one of the high-side and the low-side transistors performs a linear operation.

A liquid ejecting apparatus includes an ejecting unit that includes a piezoelectric element which is displaced by a drive signal; a differential amplifier that outputs a control signal based can a source; drive signal which is a source signal of the drive signal and a signal based on the drive signal; a pair of transistors that include a high-side transistor and a low-side transistor which are controlled based oh the control signal and outputs the drive signal from an output terminal; and a selector that selects one of the high-side transistor and the low-side transistor and supplies the control signal to the selected transistor. The selector selects a transistor to which the control signal is supplied, based oh a logic level of a predetermined select signal. The logic level of the select signal is inverted for a predetermined period.

A drive circuit that drives a piezoelectric device including a drive signal selection control circuit which controls supply of the drive signal to the piezoelectric element, the drive circuit including a drive signal output circuit that outputs the drive signal, a power supply voltage signal output circuit that outputs a power supply voltage signal, and a power supply voltage control circuit that controls supply of the power supply voltage signal to the drive signal selection control circuit, in which the drive signal output circuit includes a modulation circuit, an amplification circuit, a demodulation circuit, a feedback circuit, and a discharge circuit, a first wiring electrically couples the drive signal selection control circuit and the power supply voltage control circuit to each other, and the discharge circuit is electrically coupled to a second wiring through which the drive signal output from the demodulation circuit propagates, through the feedback circuit.

A liquid ejecting apparatus according to the invention includes: a modulation unit that generates a modulated signal which is obtained by pulse-modulating an original signal; a transistor that generates an amplified and modulated signal which is obtained by amplifying the modulated signal; a switching circuit; a low pass filter that generates a drive signal by demodulating the amplified and modulated signal; a feedback circuit that generates a feedback signal and feeds back the feedback signal to the modulation unit; a feedback terminal that electrically connects the modulation unit to the feedback circuit; a piezoelectric element that is displaced by the drive signal; a cavity; and a nozzle, in which a distance between the feedback terminal and a closest point to the feedback terminal in the modulation unit is shorter than a distance between the feedback terminal and a closest point to the feedback terminal in the switching circuit.

A liquid ejecting apparatus includes a print head, a digital signal output circuit, and a liquid accommodating container, and the print head includes a supply port to which the liquid is supplied from the liquid accommodating container, a nozzle plate having a plurality of nozzles, a substrate that has a first surface and a second surface different from the first surface, a connector to which the digital signal is input, and an integrated circuit to which the digital signal is input via the connector and that outputs an abnormality detection signal indicating presence or absence of an abnormality in the print head, the connector is provided on the first surface, the integrated circuit is provided on the second surface, and a through hole that penetrates the first surface and the second surface is provided in a mounting region on which the integrated circuit is provided in the substrate.