Method and apparatus for image sensor packaging
First Claim
Patent Images
1. A method of fabricating an image sensor package, the method comprising:
- providing a sensor substrate having a plurality of pixels disposed in a sensor region, the sensor substrate having one or more redistribution layers (RLDs) on a front side of the sensor substrate and a plurality of sensor bond pads in an uppermost RDL, each of the plurality of sensor bond pads disposed outside the sensor region;
providing a control circuit die having a plurality of control circuits and a plurality of control circuit bond pads; and
mounting the control circuit die on a first surface of the RDL, each of the plurality of control circuit bond pads in electrical contact with one of the plurality of sensor bond pads.
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Abstract
A backside illuminated image sensor having a photodiode and a first transistor in a sensor region and located in a first substrate, with the first transistor electrically coupled to the photodiode. The image sensor has logic circuits formed in a second substrate. The second substrate is stacked on the first substrate and the logic circuits are coupled to the first transistor through bonding pads, the bonding pads disposed outside of the sensor region.
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Citations
20 Claims
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1. A method of fabricating an image sensor package, the method comprising:
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providing a sensor substrate having a plurality of pixels disposed in a sensor region, the sensor substrate having one or more redistribution layers (RLDs) on a front side of the sensor substrate and a plurality of sensor bond pads in an uppermost RDL, each of the plurality of sensor bond pads disposed outside the sensor region; providing a control circuit die having a plurality of control circuits and a plurality of control circuit bond pads; and mounting the control circuit die on a first surface of the RDL, each of the plurality of control circuit bond pads in electrical contact with one of the plurality of sensor bond pads. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
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10. A method of fabricating an image sensor package, the method comprising:
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providing a sensor die having a plurality of backside illuminated pixels disposed within a sensor region, the sensor die having a plurality of sensor bond pads disposed outside the sensor region, each of the plurality of sensor bond pads electrically coupled to one of the backside illuminated pixels and being exposed at a front side of the sensor die; providing a control circuit die having an electrical circuit therein and a plurality of control circuit bond pads, each of the control circuit bond pads being exposed at a front side of the control circuit die; and bonding the front side of the sensor die to the front side of the control circuit die such that the sensor bond pads are in electrical contact with the control circuit bond pad. - View Dependent Claims (11, 12, 13, 14, 15, 16)
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17. A method of fabricating an image sensor package, the method comprising:
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providing a first die having a plurality of backside illuminated pixels disposed within a sensor region, the first die further having a plurality of first bond pads exposed at a front side of the first die, wherein the first bond pads are electrically connected to the plurality of backside illuminated pixels by row select lines and output lines, wherein the sensor region is substantially free of metal features exposed at the front side of the first die; bonding a second die having an electrical circuit disposed therein to the front side of the first die such that the first bond pads are in electrical contact with second bond pads that are exposed at a front side of the second die, wherein the second bond pads are electrically connected to the electrical circuit; and thinning a backside of the first die opposite the front side of the first die. - View Dependent Claims (18, 19, 20)
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Specification