Optical Sensor With Special Discrimination

摘要

In one embodiment, an ambient light sensor with first and second photo-detectors is disclosed. The first and second photo-detectors may have different depths and respond differently to light having a specific wavelength. The ambient lights sensor may further comprise a circuit configured to detect light of a specific wavelength. In another embodiment, the first and second photo-detectors may be configured such that each of the first and second photo-detectors detects coupling current from each other. In yet another embodiment, in addition to the first and second photo-detectors, a third photo-detector may be formed proximate to at least one of the first and second photo-detectors such that coupling photo-current is detected therein by the at least one of the first and second photo-detectors.

主权项

1. An ambient light sensor for sensing incident light, comprising:
a first photo-detector configured to be exposed to the incident light; a second photo-detector configured to be exposed to the incident light and formed proximate to the first photo-detector such that the first and second photo-detectors receive substantially similar portions of the incident light; and a circuit coupled to the first and second photo-detectors configured to determine an indication of spectral content of the incident light; wherein the first and second photo-detectors have first and second depths respectively; and wherein the first depth is relatively deeper than the second depth such that the first and second photo-detectors respond differently to a specific predetermined wavelength of the incident light.