Depth sensing pixel, composite pixel image sensor and method of making the composite pixel image sensor

A composite pixel image sensor comprising:

• an image sensing array configured to receive a first spectrum of an incident electromagnetic radiation;
• a depth sensing pixel, wherein the depth sensing pixel comprises:
• a depth sensing photodiode;
• a first photo storage device;
• a first transistor configured to selectively couple the depth sensing photodiode to the first photo storage device;
• a second photo storage diode different from the first photo storage device;
• a second transistor configured to selectively couple the depth sensing photodiode to the second photo storage device;
• a first transfer gate configured to selectively couple the first photo storage diode to a first output node;
• and
• a second transfer gate configured to selectively couple the second photo storage diode to a second output node;
• and
• a bonding interface coupling the image sensing array to the depth sensing pixel.

A composite pixel image sensor comprising:

• an image sensing array configured to receive a first spectrum of an incident electromagnetic radiation;
• a depth sensing pixel bonded to the image sensing array, wherein the depth sensing pixel is configured to receive a second spectrum of the incident electromagnetic radiation, and the depth sensing pixel comprises:
• a depth sensing photodiode;
• a first photo storage device;
• a first transistor configured to selectively couple the depth sensing photodiode to the first photo storage device;
• a second photo storage diode different from the first photo storage device;
• a second transistor configured to selectively couple the depth sensing photodiode to the second photo storage device;
• a first transfer gate configured to selectively couple the first photo storage diode to a first output node;
• and
• a second transfer gate configured to selectively couple the second photo storage diode to a second output node;
• and
• a readout circuit configured to receive an output signal from the image sensing array and an output signal from the depth sensing pixel.