DEPTH PIXEL INCLUDED IN THREE-DIMENSIONAL IMAGE SENSOR AND THREE-DIMENSIONAL IMAGE SENSOR INCLUDING THE SAME

摘要

A depth pixel of a three-dimensional image sensor includes a light detection region, first and second photo gates, and first and second floating diffusion regions. The light detection region collects electric charges based on light reflected by an object. An internal electric field is formed for moving the collected charges in first and second directions. The first photo gate is formed on the upper part of the light detection region, and is activated in response to a first photo control signal. The first floating diffusion region accumulates first electric charges drifted in the first direction if the first photo gate is activated. The second photo gate is formed on the upper part of the photo detection region apart from the first photo gate, and is activated in response to the first photo control signal. The second floating diffusion region accumulates second electric charges drifted in the second direction if the second photo gate is activated.