Patent ID: 8106345

Claim:
A photo sensor, comprising: a first transistor having a first electrode coupled to a first node, a second electrode coupled to a second node, and a gate electrode coupled to a third node; a second transistor having a first electrode coupled to a fourth node, a second electrode coupled to the first node, and a gate electrode coupled to a first control signal line; a third transistor having a first electrode coupled to the second node, a second electrode coupled to the third node, and a gate electrode coupled to the first control signal line; a fourth transistor having a first electrode coupled to a reset power line, a second electrode coupled to the third node, and a gate electrode coupled to a reset signal line; a fifth transistor having a first electrode coupled to a first power source, a second electrode coupled to the first node, and a gate electrode coupled to a second control signal line; a sixth transistor having a first electrode coupled to the second node, a second electrode coupled to an output line, and a gate electrode coupled to the second control signal line; a seventh transistor having a first electrode coupled to a second power source, a second electrode coupled to the fourth node, and a gate electrode coupled to the reset signal line; a photo diode having a cathode electrode coupled to a third power source and an anode electrode coupled to the fourth node; a first capacitor having a first electrode coupled to the third node and a second electrode coupled to the first power source; and a second capacitor having a first electrode coupled to the third power source and a second electrode coupled to the fourth node.