Patent ID: 11862651
Assignee: OMNIVISION TECHNOLOGIES, INC.
Field: Semiconductors (Electrical engineering)
Classification: CPC H  G | IPC G  H

Claim 0:
1. A light-trapping image sensor, comprising:
a pixel array formed in and on a semiconductor substrate and including photosensitive pixels each including a reflective material forming a cavity around a portion of semiconductor material to at least partly trap light that has entered the cavity, the cavity having a ceiling at a light-receiving surface of the semiconductor substrate, the ceiling forming an aperture for receiving the light into the cavity;
a lens array disposed on the pixel array, each lens of the lens array being a microsphere aligned to the aperture of a respective cavity to focus the light into the cavity through the aperture; and
each microsphere being formed from a color-filtering material to spectrally filter the light while focusing the light, the lens array being an array of identical microsphere groups each including a plurality of microspheres configured to selectively transmit light in a respective plurality of spectral ranges.