Patent ID: 8237238

Claim:
An image sensor, comprising: a substrate, having a first surface; a deep well layer, located in the substrate; a plurality of first sensing units, located between the first surface and the deep well layer; a plurality of second sensing units, located between the first surface and the deep well layer; and a plurality of third sensing units, located between the first surface and the deep well layer, wherein a ratio between an area of a part of the deep well layer under each first sensing unit and an area of each first sensing unit is a first area ratio, a ratio between an area of a part of the deep well layer under each second sensing unit and an area of each second sensing unit is a second area ratio, and a ratio between an area of a part of the deep well layer under each third sensing unit and an area of each third sensing unit is a third area ratio, and the first area ratio is greater than the second area ratio and the third area ratio.