IMAGE SENSOR

摘要

An image sensor is formed by a pixel array including a plurality of pixels. Certain ones of the pixels include, above their active areas, a first optical grating formed of periodically spaced apart parallel strips separated from the active area by a first insulator. Those pixels further include, in another metal level, a second optical grating formed of periodically spaced apart parallel strips separated from the first grating by a second insulator. The second optical grating is laterally shifted with respect to the first grating in a direction orthogonal to a longitudinal direction of the parallel strips.

主权项

1. An image sensor, comprising:
a pixel array including a plurality of pixels, wherein each pixel comprises an active area and a structure over the active area comprising: a first metal level including a first optical grating formed of periodically spaced apart parallel strips that are separated from the active area by a first insulator; a second metal level including a second optical grating formed of periodically spaced apart parallel strips separated from the first grating by a second insulator, and a third metal level positioned between the first and second metal levels; wherein the second optical grating is shifted with respect to the first grating in a direction orthogonal to a longitudinal direction of the strips.