Active-passive imager pixel array with small groups of pixels having short common bus lines
First Claim
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1. An imager array comprising:
- a plurality of pixel groups, each pixel group comprising;
a plurality of pixels located in close proximity to each other and connected to a common bus line, the common bus line having a relatively low bus capacitance; and
an amplifier connected to the common bus line, wherein the amplifier is located in close proximity to the plurality of pixels;
wherein the plurality of pixels comprises four pixels, such that one pixel is a dark pixel used to subtract off an amplifier offset associated with the amplifier.
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Abstract
A shared output visible imager pixel array combines a high optical fill factor with low read noise. A relatively small group of pixels are connected to a relatively short common bus line. An amplifier located in close proximity with the pixels is connected to the common bus line and shared among the pixels. By reducing the amount of amplifier circuitry associated with each pixel, the optical fill factor is increased. Also, since the bus line is relatively short, the bus capacitance is much lower relative to the traditional passive-pixel designs. On average, the transistor count per pixel can be less than two, for large arrays.
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Citations
20 Claims
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1. An imager array comprising:
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a plurality of pixel groups, each pixel group comprising;
a plurality of pixels located in close proximity to each other and connected to a common bus line, the common bus line having a relatively low bus capacitance; and
an amplifier connected to the common bus line, wherein the amplifier is located in close proximity to the plurality of pixels;
wherein the plurality of pixels comprises four pixels, such that one pixel is a dark pixel used to subtract off an amplifier offset associated with the amplifier. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10)
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11. An imager array comprising:
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a plurality of pixel groups, each pixel group comprising;
a common bus line, the common bus line being shorter than a bus line in a standard passive pixel imager and having a relatively low bus capacitance;
a plurality of passive pixels located in close proximity to each other and connected to the common bus line;
an amplifier FET connected to the common bus line, wherein the amplifier FET is located in close proximity to the plurality of passive pixels;
a reset FET connected to the common bus line; and
an output access FET connected to the amplifier FET and an output bus;
wherein the plurality of passive pixels comprises four pixels, such that one pixel is a dark pixel used to subtract off an amplifier offset associated with the amplifier FET. - View Dependent Claims (12, 13, 14, 15, 16, 17, 18, 19)
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20. An imager array having a relatively high optical fill factor and low bus capacitance, the imager array comprising:
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a plurality of pixel groups, each pixel group comprising;
a plurality of passive pixels located in close proximity to each other and connected to a common bus line, the common bus line being relatively short; and
an amplifier connected to the common bus line, wherein the amplifier is located in close proximity to the plurality of passive pixels;
wherein the average number of transistors per pixel in the array is less than two, wherein the plurality of passive pixels comprise four pixels, such that one pixel is a dark pixel used to subtract off an amplifier offset associated with the amplifier.
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Specification