Patent ID: 8264434

Claim:
An active matrix substrate comprising: data signal lines each for one of data signals; scanning signal lines crossing with the data signal lines; and a matrix of pixel circuits each corresponding to one of intersections made by the data signal lines and the scanning signal lines; wherein each pixel circuit includes a field-effect transistor having a source electrode connected with one of the data signal lines that passes through a corresponding one of the intersections, directly or via a switching element and/or a capacity element; and a gate electrode connected with one of the scanning signal lines that passes through the corresponding intersection; the field-effect transistor assuming a conductive state upon application of an ON voltage while assuming a nonconductive state upon application of an OFF voltage, to the gate electrode based on the source electrode as a baseline; and a voltage holding electrode connected with a drain electrode of the field-effect transistor, providing a voltage holding capacitor; and wherein each pixel circuit is formed so that a value given by an equation below will be substantially equal among the pixel circuits ( Vgpp·Cgd+ΔQd )/ Cpix where Vgpp represents an amount of potential change at the gate electrode from a time when a gate signal, which is given to the gate electrode of the field-effect transistor via the scanning signal line, starts its transition from the ON voltage to the OFF voltage to a time when the transition is complete; Cgd represents an electrostatic capacity between the gate electrode and the drain electrode in the field-effect transistor; ΔQd represents an amount of charge which moves through the field-effect transistor to the voltage holding electrode from the time when the gate signal starts its transition from the ON voltage to the OFF voltage to the time when the transition is complete; and Cpix represents a sum of electrostatic capacities formed between the drain electrode of the field-effect transistor or the voltage holding electrode and other electrodes in each pixel circuit.