Method and apparatus for providing offset for light detector
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United States of America Patent
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Oct 4, 1994
Grant Date -
N/A
app pub date -
Apr 14, 1993
filing date -
Apr 14, 1993
priority date (Note) -
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status (Latency Note)
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Abstract
The invention provides a solid state light imager or x-ray detector including an array of rows and columns of elements, each element including a photo diode, which converts photons to an electrical signal, and a transistor. Each photo diode has a capacitance associated with it. The cathode of the photo diode in each element is connected to the source of the transistor in the element. The amount of charge removed from each photo diode, after exposure to light, is used to create an image. The imager is capable of accurate measurement of charge removed from the photo diodes after the array has been exposed to light, using unipolar measuring circuitry, in spite of charge retention by the transistors and a problem caused by the combination of changes in row voltage and parasitic row to column capacitance.
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