Patent ID: 9019409
Filing Date: 2015-04-28
Classification: H04N

Abstract:
1. An image sensing device comprising: a ramp signal generation unit configured to generate a ramp signal decreasing during a first period for finding a data value corresponding to a pixel signal provided from a pixel and decreasing during a second period for finding an offset value, and generate a control signal; a plurality of comparison units, each configured to perform a first comparison operation of comparing the pixel signal with the ramp signal during the first period, and a second comparison operation of comparing the ramp signal with an internally generated offset value during the second period; a first single counting unit configured to receive the control signal from the ramp signal generation unit, and perform an up-count operation during the first period in response to the control signal; and a plurality of second counting units, each configured to latch a count value of the single first counting unit as a data value in response to a comparison result of the first comparison operation during the first period, and perform a down-count operation from a latched data value in response to a comparison result of the second comparison operation during the second period, wherein the single first count unit provides the count value to each of the plurality of second counting units, and wherein a counting operation of the pixel signal is performed by only the single first counting unit, and a counting operation of the offset value is performed by each of the plurality of second counting units.