Logarithmic response digital pixel sensor and method of processing digital signal thereof
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United States of America Patent
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Issued Date -
Jul 31, 2008
app pub date -
Jan 29, 2007
filing date -
Jan 29, 2007
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Abandoned
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Abstract
A logarithmic response digital pixel sensor comprises a linear light detecting unit, an exponential producer, a counting unit, a comparator and a memory unit. The logarithmic response digital pixel sensor is used for detecting light via the linear light detecting unit for producing a linear analogy detecting signal. The exponential producer is used for providing an exponential reference signal. The comparator is used for comparing the linear analogy detecting signal with the exponential reference signal and outputting a comparison result to the memory unit. The memory unit is used for producing a logarithmic response digital signal by processing the comparison result and a count reference signal provided from the counting unit. Thereby, the present invention improves upon the drawbacks of the traditional logarithmic response analogy image sensor, and simplifies the design of the back image sensor processing circuit.
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