Thermal infrared image sensor
First Claim
Patent Images
1. A thermal infrared image sensor comprising:
- (a) a plurality of pixels, each pixel comprising a thermosensing element for conducting current;
(b) a plurality of read lines each connected to a predetermined number of the thermosensing elements;
(c) each pixel further including a pixel switch connected to the respective thermosensing element and to a respective read line, the pixel switch allowing current to flow from the thermosensing element to the read line whenever the pixel switch is on, and the pixel switch preventing current from flowing from the thermosensing element to the read line whenever the pixel switch is off;
(d) a parallel read device connected to the read lines and operable to read current signals conducted by the thermosensing elements;
(e) a first accumulator operable to accumulate current signals read by the parallel read device; and
(f) a serial scan device operable to sequentially and serially read current signals accumulated by the first accumulator.
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Abstract
A thermal type infrared image sensor is provided, the sensor including rows and columns of pixels forming a matrix, each pixel having a thermosensing element connected to a switch, vertical read lines connected to columns of pixels, a vertical reading circuit for extracting, in parallel, signals from rows of pixels in the matrix via the vertical read lines, an accumulator for accumulating signals output from the vertical reading circuit, a horizontal switching device and a horizontal scan circuit for sequentially and serially reading the accumulated signals.
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Citations
58 Claims
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1. A thermal infrared image sensor comprising:
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(a) a plurality of pixels, each pixel comprising a thermosensing element for conducting current; (b) a plurality of read lines each connected to a predetermined number of the thermosensing elements; (c) each pixel further including a pixel switch connected to the respective thermosensing element and to a respective read line, the pixel switch allowing current to flow from the thermosensing element to the read line whenever the pixel switch is on, and the pixel switch preventing current from flowing from the thermosensing element to the read line whenever the pixel switch is off; (d) a parallel read device connected to the read lines and operable to read current signals conducted by the thermosensing elements; (e) a first accumulator operable to accumulate current signals read by the parallel read device; and (f) a serial scan device operable to sequentially and serially read current signals accumulated by the first accumulator. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15)
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16. A thermal infrared image sensor comprising:
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(a) a plurality of pixels arranged in columns and rows, each pixel comprising a thermosensing element for conducting current, wherein current levels that flow through the thermosensing element vary with changes in temperature of the pixel; (b) a plurality of vertical read lines each connected to a respective column of pixels; (c) each pixel further including a first switch connected to the thermosensing element and to a respective vertical read line, the first switch allowing current to flow from the thermosensing element to the vertical read line whenever the first switch is on, and the first switch preventing current from flowing from the thermosensing element to the vertical read line whenever the first switch is off; (d) a plurality of second switches each connected to a respective vertical read line; (e) a vertical reading circuit for sequentially controlling the first switches by rows of pixels; (f) a plurality of current-voltage conversion circuits, each current-voltage conversion circuit being connected to a respective vertical read line through the respective second switch, each current-voltage conversion circuit converting current signals of the respective row of pixels to corresponding voltage signals whenever the respective second switch is turned on; (g) a plurality of first accumulators, each first accumulator being connected to a respective current-voltage conversion circuit to accumulate voltage signals output from the current-voltage conversion circuit; (h) a plurality of transfer switches, each transfer switch being connected between a respective current-voltage conversion circuit and a respective first accumulator, wherein the transfer switch may be in an ON state to allow voltage signals to flow from the respective current-voltage conversion circuit to the respective first accumulator, and wherein the transfer switch may be in an OFF state to prevent voltage signals from flowing from the respective current-voltage conversion circuit to the respective first accumulator; (i) horizontal read switches to sequentially and serially output the voltage signals accumulated in the first accumulators; and (j) a horizontal scanning circuit to sequentially control the horizontal read switches. - View Dependent Claims (17, 18, 19, 20, 21, 22)
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23. A thermal infrared image sensor comprising:
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(a) a plurality of pixels, each pixel comprising a thermosensing element to output current signals that vary with changes in temperature of the pixel; (b) a plurality of read lines, each read line being connected to a predetermined number of respective pixels; (c) a plurality of buffer amplifiers, each buffer amplifier being connected to a respective read line to output current signals received from the respective pixels; (d) an offset compensator for compensating for offsets inherent in the buffer amplifiers; (e) a plurality of integration circuits to integrate current signals received from the buffer amplifiers and to output voltage signals corresponding to the current signals; and (f) a serial scanner to sequentially and serially read the voltage signals from the integration circuits. - View Dependent Claims (24, 25, 26, 27, 28, 29, 30, 31, 32, 33, 34, 35, 36, 37, 38)
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39. A thermal infrared image sensor comprising:
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(a) a plurality of pixels, each pixel comprising a thermosensing element to output current signals that vary with changes in temperature; (b) a plurality of read lines, each read line being connected to a predetermined number of respective pixels; (c) a plurality of buffer amplifiers each being connected to a respective read line to output current signals received from the respective pixels; (d) a plurality of current bias devices, each current bias device being operable to bias each pixel through the respective buffer amplifiers; (e) a background-light removing device for removing current components of the pixel current signal that correspond to background light received by the respective pixel; (f) a plurality of integration circuits for integrating currents output from the respective buffer amplifiers, after the respective current components corresponding to background light are removed, to output respective voltage signals; and (g) a serial scanner for sequentially and serially reading the current signals output from the integration circuit. - View Dependent Claims (40, 41, 42, 43, 44, 45, 46, 47, 48, 49, 50, 51, 52, 53, 54, 55, 56, 57, 58)
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Specification