Patent ID: 7446739

Claim:
An electro-optical device, comprising: an electro-optical element with a current-based data signal defining a tonal gradation level of pixels, and supplied to data lines, and with a luminance set in response to a driving current flowing from a power source voltage to a voltage lower in level than the power source voltage; the data lines arranged for respective pixels; power source lines to supply the pixels with the power source voltage; signal transfer lines; a first switching element to control electrical conduction between the data line and the signal transfer line; and a second switching element to control electrical conduction between the power source voltage and the signal transfer line, during a first mode in which the data signal is supplied to the data line not through the first switching element, the first switching element is set to be in a non-conductive state while the second switching element is set to be in a conductive state, and during a second mode in which a signal different from the data signal is supplied to the data line through the first switching element, the first switching element is set to be in a conductive state while the second switching element is set to be in a non-conductive state.