Liquid discharge head substrate, liquid discharge head, and printing apparatus

A liquid discharge head substrate comprising:

• a discharge unit including a discharge element configured to generate energy for discharging a liquid from an orifice and a discharge control circuit configured to control the discharge element;
• and
• a first voltage generation circuit configured to supply, to the discharge control circuit, a first driving voltage for driving the discharge control circuit,
• wherein the first voltage generation circuit controls the first driving voltage based on a comparison result of a voltage of one terminal of the discharge element and a first reference voltage supplied from outside of the liquid discharge head substrate, and
• wherein the one terminal of the discharge element has a voltage correlated with a voltage to be supplied to the discharge element.

A liquid discharge head comprising:

• a liquid discharge head substrate and a liquid supply unit, wherein
• the liquid discharge head substrate comprises:
• a discharge unit including a discharge element configured to generate energy for discharging a liquid from an orifice and a discharge control circuit configured to control the discharge element;
• and
• a first voltage generation circuit configured to supply, to the discharge control circuit, a first driving voltage for driving the discharge control circuit,
• the discharge unit includes a first node having a voltage correlated with a voltage to be supplied to the discharge element,
• the first voltage generation circuit controls the first driving voltage based on a comparison result of the voltage of the first node and a first reference voltage supplied from outside of the liquid discharge head substrate;
• and
• the liquid supply unit is configured to supply a liquid to the liquid discharge head substrate.

A printing apparatus comprising:

• a liquid discharge head which comprising a liquid discharge head substrate and a liquid supply unit, and a driving unit, wherein
• the liquid discharge head substrate comprises:
• a discharge unit including a discharge element configured to generate energy for discharging a liquid from an orifice and a discharge control circuit configured to control the discharge element;
• and
• a first voltage generation circuit configured to supply, to the discharge control circuit, a first driving voltage for driving the discharge control circuit,
• the discharge unit includes a first node having a voltage correlated with a voltage to be supplied to the discharge element,
• the first voltage generation circuit controls the first driving voltage based on a comparison result of the voltage of the first node and a first reference voltage supplied from outside of the liquid discharge head substrate;
• the liquid supply unit is configured to supply a liquid to the liquid discharge head substrate;
• and
• the driving unit is configured to drive the liquid discharge head.