Patent ID: 6703856
Filing Date: 2004-03-09
Classification: G09G

Abstract:
A test method for testing an electro-optical device using a test circuit which operates in response to an action command signal periodically changing a level thereof, the electro-optical device including a pixel electrode which is arranged at an intersection of each of scanning lines and each of data lines and serves as one electrode of a capacitor, and a pixel switching element connected between the pixel electrode and the data line, the method comprising:supplying the pixel electrode with a data signal by turning on the pixel switching element; turning on a test switching element connected between the pixel electrode and the data line at a timing delayed from a timing of a level change of the action command signal in the course of outputting a voltage supplied to the pixel electrode to a reading signal-line by using the test circuit; and determining whether the voltage output to the reading signal-line corresponds to a voltage responsive to the data signal supplied to the pixel electrode.