MICROLENS FOR A PHASE DETECTION AUTO FOCUS (PHAF) PIXEL OF A COMPOSITE GRID STRUCTURE

摘要

An image sensor for high angular response discrimination is provided. A plurality of pixels comprises a phase detection autofocus (PDAF) pixel and an image capture pixel. Pixel sensors of the pixels are arranged in a semiconductor substrate. A grid structure is arranged over the semiconductor substrate, laterally surrounding color filters of the pixels. Microlenses of the pixels are arranged over the grid structure, and comprise a PDAF microlens of the PDAF pixel and an image capture microlens of the image capture pixel. The PDAF microlens comprises a larger optical power than the image capture microlens, or comprises a location or shape so a PDAF receiving surface of the PDAF pixel has an asymmetric profile. A method for manufacturing the image sensor is also provided.

主权项

1. An image sensor comprising:
a plurality of pixels comprising a phase detection autofocus (PDAF) pixel and an image capture pixel; pixel sensors of the pixels arranged in a semiconductor substrate, wherein the pixel sensors comprise a PDAF pixel sensor corresponding to the PDAF pixel; a grid structure arranged over the semiconductor substrate, laterally surrounding color filters of the pixels, wherein the grid structure comprises a metal grid structure and a dielectric grid structure overlying the metal grid structure, and wherein the metal and dielectric grid structures collectively define openings filled by the color filters; and microlenses of the pixels arranged over the grid structure, and comprising a PDAF microlens of the PDAF pixel and an image capture microlens of the image capture pixel; wherein the PDAF microlens comprises a larger optical power than the image capture microlens, or comprises a location or shape so a PDAF receiving surface of the PDAF pixel has an asymmetric profile.