A photoelectric conversion apparatus having (i) a photoelectric conversion device for converting an incident light into an electric charge and (ii) a reading circuit including at least one thin film transistor for amplifying a signal from the photoelectric conversion device. At least a part of the photoelectric conversion device is formed on a part of the reading circuit. The photoelectric conversion device has a dynamic image reading mode for deriving a plurality of images within a second.
This is a divisional application of application Ser. No. 10/247,331, filed Sep. 20, 2002 now U.S. Pat. No. 6,787,778, which is a divisional application of application Ser. No. 09/252,073, filed Feb. 18, 1999, now U.S. Pat. No. 6,600,160.
Priority Data
Feb 20, 1998 [JP] 10-038872 Feb 12, 1999 [JP] 11-034470
A display device capable of applying reverse driving voltage for a light emitting element to a light emitting element every certain period for prolonging light emitting element's life and burning out a shorted portion. Besides a path for supplying forward current to the light emitting element, a path for supplying reverse current is provided. A driving transistor is provided in the former path while a transistor (AC transistor) is provided in the latter path, thereby a switching between the two paths is controlled. The AC transistor has a rate L/W of a channel length L to a channel width W smaller than that of the driving transistor. Accordingly, current flowing into the light emitting element can flow into the AC transistor in the case of reverse driving voltage being applied to the light emitting element.
