Superposed multi-junction color APS
First Claim
Patent Images
1. A photosensor comprising:
- a first charge collection region having a first absorption length; and
a second charge collection region having a second absorption length, wherein the first charge collection region and the second charge collection region are superposed;
wherein each of the first and second charge collection regions is connected to an individually controlled, dedicated reset transistor and an individually controlled, dedicated output transistor.
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Abstract
A CMOS image sensor obtains color through the use of two or three superposed layers. Each pixel in the image sensor includes a plurality of superposed photosensitive p-n junctions with individual charge integration regions. The combination of each of the superposed layers provides increased sensitivity and resolution of a single chip color imager.
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Citations
8 Claims
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1. A photosensor comprising:
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a first charge collection region having a first absorption length; and
a second charge collection region having a second absorption length, wherein the first charge collection region and the second charge collection region are superposed;
wherein each of the first and second charge collection regions is connected to an individually controlled, dedicated reset transistor and an individually controlled, dedicated output transistor. - View Dependent Claims (2, 3, 4, 5, 6)
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7. A method of generating color in an active pixel sensor comprising:
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generating light of a first color in a first charge collection region;
generating light of a second color in a second charge collection region;
outputting the light with an individually controlled, dedicated reset transistor and an individually controlled, dedicated output transistor for each of the first and second charge collection regions; and
superposing the light of the first color with the light of the second color. - View Dependent Claims (8)
generating light of a third color in a third charge collection region;
outputting the light with an individually controlled, dedicated reset transistor and an individually controlled, dedicated output transistor for the third charge collection region; and
superposing the light of the third color with the light of the first and second color.
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Specification