Patent ID: 7909444

Claim:
A liquid discharge cartridge integrally having a liquid discharge head discharging liquid, and a liquid container containing liquid supplied to the liquid discharge head, wherein the liquid container comprises a sensor for detecting residual liquid amount in the liquid container; and wherein the liquid discharge head comprises: an electrothermal conversion element and a switch element for controlling current supply to said electrothermal conversion element wherein said electrothermal conversion element and said switch element pie arranged over a semiconductor substrate, detection means of detecting the residual liquid amount in the liquid container using the sensor, judgment means of judging presence of the residual liquid amount in the liquid container on the basis of an output from the detection means, and outputting zero residual liquid amount information when judging that there is no residual liquid amount in the liquid container, and nonvolatile memory means of storing zero residual liquid amount information when the zero residual liquid amount information is outputted from the judgment means, wherein in the liquid discharge head, the detection means, the judgement means and the nonvolatile memory means are all arranged in a monolithic configuration over the semiconductor substrate.