Photosensitive imaging devices and associated methods
First Claim
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1. A monolithic sensor for detecting infrared and visible light, comprising:
- a semiconductor substrate;
a semiconductor layer coupled to the semiconductor substrate, the semiconductor layer having a device surface opposite the semiconductor substrate;
a visible light photodiode formed at the device surface;
an infrared photodiode formed at the device surface in proximity to the visible light photodiode;
a light diffusing region associated with the infrared photodiode and positioned to interact with electromagnetic radiation; and
a global shutter coupled to said infrared photodiode and configured to activate signal integration in substantial synchronization with emission of infrared pulses generated by an infrared radiation source and to discontinue signal integration between said infrared pulses generated by said infrared radiation source.
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Abstract
A monolithic sensor for detecting infrared and visible light according to an example includes a semiconductor substrate and a semiconductor layer coupled to the semiconductor substrate. The semiconductor layer includes a device surface opposite the semiconductor substrate. A visible light photodiode is formed at the device surface. An infrared photodiode is also formed at the device surface and in proximity to the visible light photodiode. A textured region is coupled to the infrared photodiode and positioned to interact with electromagnetic radiation.
685 Citations
24 Claims
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1. A monolithic sensor for detecting infrared and visible light, comprising:
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a semiconductor substrate; a semiconductor layer coupled to the semiconductor substrate, the semiconductor layer having a device surface opposite the semiconductor substrate; a visible light photodiode formed at the device surface; an infrared photodiode formed at the device surface in proximity to the visible light photodiode; a light diffusing region associated with the infrared photodiode and positioned to interact with electromagnetic radiation; and a global shutter coupled to said infrared photodiode and configured to activate signal integration in substantial synchronization with emission of infrared pulses generated by an infrared radiation source and to discontinue signal integration between said infrared pulses generated by said infrared radiation source. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11)
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12. A system for detecting infrared and visible light, comprising:
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an infrared radiation source for generating one or more pulses of infrared radiation; and a monolithic sensor, comprising; a semiconductor substrate; a semiconductor layer coupled to the semiconductor substrate, the semiconductor layer having a device surface opposite the semiconductor substrate; a visible light photodiode formed at the device surface; an infrared photodiode formed at the device surface in proximity to the visible light photodiode; a light diffusing region associated with the infrared photodiode and positioned to interact with electromagnetic radiation; and a global shutter coupled to said infrared photodiode and configured to activate signal integration in substantial synchronization with emission of infrared pulses generated by said infrared radiation source and to discontinue signal integration between said infrared pulses generated by said infrared radiation source. - View Dependent Claims (13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24)
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Specification