Image sensor having an array of operative and dummy bipolar transistors and pairs of pixel selecting switches connected thereto
First Claim
Patent Images
1. An image sensor comprising:
- an array of operative bipolar transistors for effecting photo-electric conversion of incident light;
another array of dummy bipolar transistors optically shielded from incident light and disposed adjacently and correspondingly to the operative bipolar transistors to constitute pairs of the operative and dummy bipolar transistors;
pairs of reset switches connected to the corresponding pairs of the transistors at their base regions to concurrently reset each pair of the operative and dummy bipolar transistors; and
pairs of pixel selecting switches connected to the corresponding pairs of the transistors at their emitters.
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Abstract
The image sensor is comprised of an array of operative bipolar transistors. Another array of optically shielded dummy bipolar transistors are formed adjacently to the operative bipolar transistors. Reset switches are connected to base regions of the operative and dummy bipolar transistors so as to reduce variation in dark image output, to ensure linearity of output signal, and to eliminate image storage.
62 Citations
14 Claims
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1. An image sensor comprising:
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an array of operative bipolar transistors for effecting photo-electric conversion of incident light; another array of dummy bipolar transistors optically shielded from incident light and disposed adjacently and correspondingly to the operative bipolar transistors to constitute pairs of the operative and dummy bipolar transistors; pairs of reset switches connected to the corresponding pairs of the transistors at their base regions to concurrently reset each pair of the operative and dummy bipolar transistors; and pairs of pixel selecting switches connected to the corresponding pairs of the transistors at their emitters. - View Dependent Claims (2, 3)
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4. An image sensor comprising:
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an array of operative bipolar transistors for effecting phoyo-electric conversion of the incident light; another array of dummy bipolar transistors optically shielded from incident light and disposed adjacently and correspondingly to the operative bipolar transistors to constitute pairs of the operative and dummy bipolar transistors; pairs of reset switches connected to the corresponding pairs of the transistors at their base regions to concurrently reset each pair of the operative and dummy bipolar transistors; pairs of pixel selecting switches connected to the corresponding pair of operative and dummy bipolar transistors and concurrently turned on to enable the pair of transisitors to output electric charge to common signal lines, respectively; and pairs of pixel selecting switches successively turned on so that an image signal and an offset signal are fed to the common signal lines respectively on a time-sequential basis. - View Dependent Claims (5, 6)
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7. An image sensor comprising:
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an array of operative bipolar transistors for effecting photo-electric conversion of incident light; another array of dummy bipolar transistors optically shielded from incident light and disposed adjacently and correspondingly to the operative bipolar transistors to constitute pairs of the operative and the dummy bipolar transistors; pairs of reset switches connected to the corresponding pairs of the transistors at their base regions to concurrently reset each pair of the operative and dummy bipolar transistors; and pairs of pixel selecting switches connected to the corresponding pairs of the transistors at their emitters and wherein the collectors of the transistors are held at a constant potential. - View Dependent Claims (8, 9)
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10. An image sensor comprising:
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a first array of bipolar transistors for effecting photo-electric conversion when base regions thereof are receptive of incident light; a second array of bipolar transistors for effecting photo-electric conversion when base regions thereof are receptive of incident light, the first and second arrays being disposed adjacently to each other to define pairs of bipolar transisitors including one from the first and one from the second array; means exposing the regions of the first base array and shielding the base region of the second array from incident light; reset switches connected to bases of each pair of bipolar transistors to effect the concurrent reset of the bipolar transistors; and selecting switches connected to emitters of each pair of bipolar transistors to effect the output of electric charge of selected transistors. - View Dependent Claims (11, 12, 13, 14)
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Specification