There is provided a printing apparatus including: a nozzle configured to discharge a liquid by an energy generating element; a selector configured to select, based on a print job, a driving waveform corresponding to a printing method indicated by the print job, from a plurality of driving waveforms different from each other; a signal generator configured to generate a time division multiplex signal, based on data indicating the driving waveform selected by the selector; and a separator configured to separate a driving waveform signal indicating the driving waveform selected by the selector from the time division multiplex signal generated by the signal generator. The energy generating element is configured to be driven by the driving waveform signal separated by the separator.

A head drive IC includes: a first waveform input part to which a first waveform signal being used for generation of drive signals is inputted; a second waveform input part to which a second waveform signal different from the first waveform signal and being used for generation of the drive signals is inputted; a switching signal input part to which a switching signal is inputted; and an input switching circuit which performs switching between a state in which both of the input of the first waveform signal and the input of the second waveform signal are allowed, and a state in which the input of the first waveform signal is allowed and the input of the second waveform signal is blocked.

A head drive IC includes: a first waveform input part to which a first waveform signal being used for generation of drive signals is inputted; a second waveform input part to which a second waveform signal different from the first waveform signal and being used for generation of the drive signals is inputted; a switching signal input part to which a switching signal is inputted; and an input switching circuit which performs switching between a state in which both of the input of the first waveform signal and the input of the second waveform signal are allowed, and a state in which the input of the first waveform signal is allowed and the input of the second waveform signal is blocked.

A liquid ejecting apparatus includes a control circuit substrate that outputs a head control signal for use in controlling an ejection head to a head circuit substrate. The control circuit substrate includes a first buffer circuit having a first buffer and a second buffer. The first buffer circuit can simultaneously write first image data contained in the base image data signal into the first buffer and read second image data contained in the base image data signal from the second buffer. The first buffer circuit writes the first image data into the first buffer at a first frequency and reads the first image data from the first buffer at a second frequency, which is higher than the first frequency. The first buffer circuit writes the second image data into the second buffer at the first frequency and reads the second image data from the second buffer at the second frequency.

A printing device comprises a nozzle configured to eject liquid by an energy generating element, a first selector configured to select, for each particular time period, data indicating a drive waveform based on a voltage value in the particular time period, a signal generator configured to generate a time-division multiplex signal, and a separator configured to separate a drive waveform signal indicating the drive waveform from the time-division multiplex signal generated by the signal generator. The energy generating element is configured to be driven by the drive waveform separated by the separator, and the signal generator is configured to increase an assigned time period, in the particular time period, assigned per the drive waveform selected by the first selector as a number of the drive waveforms selected by the first selector decreases.

A signal generation device includes a first signal generation portion and a second signal generation portion. The first signal generation portion, based on a reference signal that includes a plurality of rectangular single-wave signals, generates an original common signal in which the rise times of the two or more of the single-wave signals are extended so that they are different from each other, and the fall timing of one or more of the single-wave signals is shifted. The second signal generating portion generates a drive signal to be input to a piezoelectric element by extracting a rising edge of any one of the single-wave signals, the rise time of which is extended, from the original common signal amplified by the amplifying portion, maintaining a signal level changed by extracting the rising edge of the single-wave signal, and extracting a falling edge of a single-wave signal after the single-wave signal.

A printing device includes a nozzle, a multiplexing part configured to generate a time-division multiplexed signal based on first data indicating a first driving waveform and second data indicating a second driving waveform, different from the first driving waveform, and a separator configured to separate a first driving waveform signal indicating the first driving waveform or a second driving waveform signal indicating the second drive waveform from the time-division multiplexed signal. The energy generating element is driven based on the separated first driving waveform signal or the separated second driving waveform signal.

A printing device comprises a nozzle configured to eject liquid by an energy generating element, and a signal generator configured to generate a time-division multiplexed signal where first data indicating a first drive waveform and second data indicating a second drive waveform are multiplexed transmittable through a single signal line. The time-division multiplexed signal included a first part and a second part of the first drive waveform, and a third part and a fourth part of the second drive waveform. The third part is arranged between the first part and the second part, and the second part is arranged between the third part and the fourth part. The printing device further comprises a separator configured to separate one of a first drive waveform signal indicating the first drive waveform and a second drive waveform signal indicating the second drive waveform from the time-division multiplexed signal.

A liquid ejection head includes a flow passage forming portion including an ejection port through which liquid is ejected, a pressure chamber communicating with the ejection port, and an individual flow passage communicating with the pressure chamber; a first energy generating element provided at a position corresponding to the pressure chamber of the flow passage forming portion, the first energy generating element configured to generate energy for ejecting the liquid from the ejection port; a second energy generating element provided at a position corresponding to the individual flow passage of the flow passage forming portion, the second energy generating element configured to generate energy for causing the liquid to flow through the individual flow passage; and a selection driving circuit configured to determine whether to drive the second energy generating element depending on whether to drive the first energy generating element.