Optical sensor module

A wearable device, comprising a first optical sensor module, the first optical sensor module comprising:

• an image sensor configured to receive light from biological tissue;
• a light source comprising a laser and being configured to illuminate, through the tissue, the image sensor;
• and
• at least one processing circuit configured to process first data corresponding to a first light signal received by the image sensor from the light source to generate a speckleplethysmography (SPG) measurement, and to process second data corresponding to a second light signal received by the image sensor from the light source to generate a photoplethysmography (PPG) measurement,
• wherein the image sensor is configured to perform in-pixel DC light subtraction.

A wearable device, comprising a first optical sensor module, the first optical sensor module comprising:

• an image sensor configured to receive light from biological tissue;
• a light source comprising a laser, the light source being configured to selectively generate coherent and incoherent light and to illuminate, through the tissue, the image sensor;
• and
• at least one processing circuit configured to process first data corresponding to a first light signal received by the image sensor from the light source to generate a speckleplethysmography (SPG) measurement, and to process second data corresponding to a second light signal received by the image sensor from the light source to generate a photoplethysmography (PPG) measurement.