Patent ID: 7379108

Claim:
An image sensor comprising; a shift register, formed by a dynamic logic circuit, for sequentially selecting a row or a column of a two-dimensional imaging unit, said shift register comprising: a plurality of stages of unit registers, each holding a signal, a plurality of first reset circuits corresponding to the unit registers, and each of the first reset circuits being operable to reset an input signal of a back unit register when the unit register corresponding to the first reset circuit outputs a high level signal, said back unit register being arranged in back of the corresponding unit register in a shifting direction, and a plurality of second reset circuits corresponding to the unit registers, and each of the second reset circuits being operable to reset an input signal of a front unit register when the unit register corresponding to the second reset circuit outputs a high level signal, said front unit register being arranged in front of the corresponding unit register in the shifting direction; wherein each first reset circuit has a first transistor which is on when the output signal of the corresponding unit register is at high level, and drives an input signal line of the back unit register to a low level via the first transistor; and wherein each second reset circuit includes a second transistor which is on when an output signal of the corresponding unit register is at high level, and drives an input signal line of the front unit register to the low level via the second transistor.