CMOS image sensors including backside illumination structure
First Claim
Patent Images
1. An image sensor having a backside illumination structure, comprising:
- a photo diode unit in a first wafer, the photo diode unit comprising photo diodes and transfer gate transistors coupled to respective ones of the photo diodes, and the photo diode unit configured to be positioned in an incident light path;
a wiring line unit on a second wafer, a side of the second wafer that faces upstream in the incident light path bonded to a downstream-facing side of the photo diode unit, the wiring line unit comprising wiring lines and transistors configured to process signals provided by the photo diode unit and configured to control the photo diode unit, and the second wafer positioned between the transistors in the wiring line unit and the photo diodes;
a supporting substrate bonded to a downstream-facing side of the wiring line unit; and
a filter unit upstream in the incident light path from the first wafer such that the photo diode unit is between the filter unit and the wiring line unit.
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Abstract
An image sensor having a backside illumination structure can include a photo diode unit in a first wafer, where the photo diode unit includes photo diodes and transfer gate transistors coupled to respective ones of the photo diodes. A wiring line unit can be included on a second wafer that is bonded to the photo diode unit, where the wiring line unit includes wiring lines and transistors configured to process signals provided by the photo diode unit and configured to control the photo diode unit. A supporting substrate is bonded to the wiring line unit and a filter unit is located under the first wafer.
51 Citations
16 Claims
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1. An image sensor having a backside illumination structure, comprising:
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a photo diode unit in a first wafer, the photo diode unit comprising photo diodes and transfer gate transistors coupled to respective ones of the photo diodes, and the photo diode unit configured to be positioned in an incident light path; a wiring line unit on a second wafer, a side of the second wafer that faces upstream in the incident light path bonded to a downstream-facing side of the photo diode unit, the wiring line unit comprising wiring lines and transistors configured to process signals provided by the photo diode unit and configured to control the photo diode unit, and the second wafer positioned between the transistors in the wiring line unit and the photo diodes; a supporting substrate bonded to a downstream-facing side of the wiring line unit; and a filter unit upstream in the incident light path from the first wafer such that the photo diode unit is between the filter unit and the wiring line unit. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 16)
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11. A CMOS image sensor circuit comprising:
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a photo diode unit comprising photo diodes and transfer gate transistors coupled to respective ones of the photo diodes, the photo diode unit configured to be positioned in an incident light path; a micro-lens and filter unit upstream in the incident light path from the photo diode unit; a wiring line unit positioned downstream in the incident light path from the photo diode unit, the wiring line unit comprising wiring lines and transistors configured to process signals provided by the photo diode unit; and a wafer between the transistors in the wiring line unit and the photo diodes. - View Dependent Claims (12, 13, 14, 15)
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Specification