US Patent 10043485 Ambient light sensing through the human body

A portable electronic device including one or more sensors for detecting ambient light through the user's skin is disclosed. The sensors can be optical sensors such as ambient light sensors (ALS) and/or cameras. Examples of the present disclosure include a device that can determine the intensity of ambient light and can change the operating state of the portable electronic device based on the ambient light environment. The device can also determine the type of ambient light and generate notifications to the user based on the determined type.