Pixel for depth sensor and image sensor including the pixel

A unit pixel for a depth sensor, the unit pixel comprising:

• a light-intensity output circuit configured to output a pixel signal corresponding to a first electric charge and a second electric charge according to control signals;
• a first light-intensity extraction circuit configured to,
• generate the first electric charge,
• transmit the first electric charge to the light-intensity output circuit, and
• discharge the first electric charge via a first node electrically connected to the first light-intensity extraction circuit, the first electric charge varying according to an amount of light reflected from a target object;
• and
• a second light-intensity extraction circuit configured to,
• generate the second electric charge,
• transmit the second electric charge to the light-intensity output circuit, and
• discharge the second electric charge via a second node electrically connected to the second light-intensity extraction circuit, the second electric charge varying according to the amount of light reflected, wherein
• a first photoelectric conversion device is shared by a third light-intensity extraction circuit, and the second photoelectric conversion device is shared by a fourth light-intensity extraction circuit, and
• the second node is electrically disconnected from the first node.

A unit pixel array comprising,

• a depth pixel configured to sense an amount of a light reflected from a target object, the depth pixel including,
• a first light-intensity extraction circuit including a first photoelectric conversion device configured to generate a first electric charge corresponding to the amount of light reflected, the first light-intensity extraction unit configured to selectively provide the first electric charge to a floating diffusion node and discharge the first electric charge via a first node, the first node electrically connected to the first light-intensity extraction circuit,
• a second light-intensity extraction circuit including a second photoelectric conversion device configured to generate a second electric charge corresponding to the amount of light reflected, the second light-intensity extraction unit configured to selectively provide the second electric charge to the floating diffusion node and discharge the second electric charge via a second node, the second node electrically connected to the second light-intensity extraction circuit, and
• a light-intensity output circuit including the floating diffusion node, the light intensity output circuit configured to output a pixel signal that corresponds to the first electric charge and the second electric charge, if the light-intensity output circuit receives a select signal, wherein
• the second node is electrically disconnected from the first node.