Active pixel sensor with a diagonal active area
First Claim
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1. An imager structure, comprising:
- a pixel array having pixels arranged in rows and columns;
said pixel array comprising a first pixel and a second pixel formed in respectively adjacent columns and in conjunction with an active area spanning a first associated photodetector of the first pixel and a second associated photodetector of the second pixel but no other photodetectors of other pixels, said active area having the first associated photodetector and the second associated photodetector at opposite ends of said active area and having a two-dimensional shape as the pixel array is viewed from above; and
a common output for charges generated from the first photodetector and the second photodetector at a portion of said active area between said first and second photodetectors, the common output being coupled to a signal output line shared by the first pixel and the second pixel, wherein the two-dimensional shape of said active area between the first and second associated photodetectors comprises an active area component that extends diagonally with respect to an extending direction of said signal output line within the pixel array.
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Abstract
An imaging device formed as a CMOS semiconductor integrated circuit having two adjacent pixels in a row connected to a common column line. By having adjacent pixels of a row share column lines, the CMOS imager circuit eliminates half the column lines of a traditional imager allowing the fabrication of a smaller imager. The imaging device also may be fabricated to have a diagonal active area to facilitate contact of two adjacent pixels with the single column line and allow linear row select lines, reset lines and column lines.
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Citations
11 Claims
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1. An imager structure, comprising:
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a pixel array having pixels arranged in rows and columns; said pixel array comprising a first pixel and a second pixel formed in respectively adjacent columns and in conjunction with an active area spanning a first associated photodetector of the first pixel and a second associated photodetector of the second pixel but no other photodetectors of other pixels, said active area having the first associated photodetector and the second associated photodetector at opposite ends of said active area and having a two-dimensional shape as the pixel array is viewed from above; and a common output for charges generated from the first photodetector and the second photodetector at a portion of said active area between said first and second photodetectors, the common output being coupled to a signal output line shared by the first pixel and the second pixel, wherein the two-dimensional shape of said active area between the first and second associated photodetectors comprises an active area component that extends diagonally with respect to an extending direction of said signal output line within the pixel array. - View Dependent Claims (2, 6, 7)
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3. A pixel array, comprising:
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a first pixel and a second pixel, the first pixel having a first photodetector and the second pixel having a second photodetector, wherein an active area is shared by only the first photodetector and the second photodetector, said shared active area providing an output for said first and second photodetectors and having a two-dimensional shape as the pixel array is viewed from above; and a common readout line for receiving a signal from said first and second photodetectors coupled to the active area shared by the first pixel and the second pixel, wherein the two-dimensional shape of the shared active area between the first and second photodetectors comprises an active area component that extends diagonally relative to an extending direction of the common readout line across the pixel array. - View Dependent Claims (4, 8, 9)
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5. A pixel array, comprising:
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a first pixel and a second pixel, said first pixel having a first photodetector and said second pixel having a second photodetector, wherein an active area is shared by only said first photodetector and said second photodetector, and at least one of said first pixel and said second pixel further comprises a reset transistor, said reset transistor comprising a gate, a first source-drain region, and a second source-drain region in a linear arrangement as viewed from above the pixel array, wherein said shared active area between the first and second photodetectors has a two-dimensional shape as the pixel array is viewed from above, the two-dimensional shape comprising an active area component that extends diagonally relative to the linear arrangement of the reset transistor as the pixel array is viewed from above; and a common readout line for receiving charge from said shared active area. - View Dependent Claims (10, 11)
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Specification