Ambient light sensor with reduced sensitivity to noise from infrared sources

摘要

Systems and methods are provided for detecting ambient light with reduced sensitivity to infrared sources. An electronic device may include an infrared sensor, an ambient light sensor, a decoder, and a processor. The infrared sensor may detect an intensity of infrared light. The ambient light sensor may be configured to detect incident light and to generate an electronic signal indicative of an intensity of visible light. The decoder may be configured to receive the intensity of infrared light and to generate an intensity of decoded infrared light. The processor, which may be coupled to the decoder and the ambient light sensor, may be configured to substitute an alternate electronic signal for the electronic signal if the intensity of infrared light exceeds a threshold amount.

主权项

1. A method for controlling an electronic device comprising:
detecting a first intensity of all light at substantially any wavelength at a first time; detecting a first intensity of infrared light over near-infrared wavelengths at the first time; determining a first intensity of visible light based on a difference between the detected first intensity of all light and the detected first intensity of infrared light; detecting a second intensity of all light at substantially any wavelength at a second time that is after the first time; detecting a second intensity of infrared light over near-infrared wavelengths at the second time; determining a second intensity of visible light based on a difference between the detected second intensity of all light and the detected second intensity of infrared light; when the detected second intensity of infrared light is above a threshold intensity, generating a first control signal for controlling the electronic device based on the determined first intensity of visible light; and when the detected second intensity of infrared light is below the threshold intensity, generating a second control signal for controlling the electronic device based on the determined second intensity of visible light.