US Patent 9967479 Dynamic, single photodiode pixel circuit and operating method thereof

The invention relates to pixel circuit and an operating method thereof, comprisinga front-end circuit comprising a single photodiode and having an output, said front-end circuit being configured for delivering on said output a photoreceptor signal derived from a light exposure of said single photodiode;a transient detector circuit configured for detecting a change in said photoreceptor signal delivered on said output;an exposure measurement circuit configured for measuring said photoreceptor signal delivered on said output upon detection by the transient detector circuit of a change in the photoreceptor signal.