Ambient infrared detection in solid state sensors

摘要

A solid state imaging device includes an array of active pixels and an infrared cut filter formed over the sensor. Optionally, a slot in the infrared cut filter allows infrared illumination to reach the sensor to be detected by pixels covered by a visually opaque filter and surrounded by pixels of special types that limit charge leakage and enable high dynamic range sensing of infrared illumination. A ratio of average infrared signal to average brightness indicates an amount of infrared illumination reaching the imaging device.

主权项

1. An image sensor device, comprising:
an array of pixels; an infrared cutoff filter over a first area of the array of pixels; and a filter over a second area of the array of pixels that is configured to block visible illumination and that is transparent to infrared illumination.