4 TRANSISTOR IMAGE SENSOR

摘要

PURPOSE: A four-transistor image sensor is provided to implement a high definition image sensor by integrating a unit pixel of the image sensor in a minimum pixel region. CONSTITUTION: In a four-transistor image sensor, a first photo diode(PD1) and a second photo diode(PD2) convert incident light from the outside to an electrical signal. The transistor of a first transistor and a second transistor switch the first and second diodes. A floated diffusion area(FD) accumulates the electric signal of the first and second photo diodes. The floated diffusion area is connected to a reset transistor(RX) and a detection transistor(DX). The select transistor(SX) selectively transfers an amplified signal to an output terminal.