Patent ID: 8773416
Filing Date: 2014-07-08
Classification: H01L,H04N

Abstract:
1. A method for driving a semiconductor device comprising a pixel portion comprising a first transistor, a second transistor, a third transistor and a photoelectric transducer, wherein a gate of the first transistor is electrically connected to the photoelectric transducer, wherein one of a source and a drain of the second transistor is electrically connected to the gate of the first transistor, wherein one of a source and a drain of the third transistor is electrically connected to the first transistor, wherein one of a source and a drain of the first transistor is electrically connected to a first line, wherein a gate of the second transistor is electrically connected to a second line, and wherein a gate of the third transistor is electrically connected to a third line, the method comprising the steps of: outputting a first signal comprising a first pulse having a first pulse width to the third line in one frame period; outputting a second signal comprising a second pulse having a second pulse width longer than the first pulse width to the second line in the one frame period; and outputting a third signal and a fourth signal to the first line in the one frame period, wherein each of the third signal and the fourth signal is a signal depending on a potential of the gate of the first transistor.