Image sensing device and method for operating the same

Patent metadata

Field	Value
Publication number	US-9019409-B2
Application number	US-201113294312-A
Country	US
Kind code	B2
Filing date	Nov 11, 2011
Priority date	Nov 17, 2010
Publication date	Apr 28, 2015
Grant date	Apr 28, 2015

Abstract

An image sensing device includes, inter alia, a ramp signal generation unit generating a ramp signal that decreases during first and second periods for finding data values corresponding to a pixel signal and an offset value, respectively. The image sensing device also includes a comparison unit compares the pixel signal with the ramp signal during the first period, and compares the ramp signal with an internally generated offset value during the second period. A first counting unit is configured to perform a counting operation during the first period, and a second counting unit configured to latch a count value of the first counting unit as a data value in response to the result of the first comparison operation during the first period, perform a down-count operation from the latched data value in response to the result of the second comparison operation during the second period, and latch a counting result.

First claim

What is claimed is:

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…

Assignees

• Kim Eun Jun
• Sk Hynix Inc

Inventors

• Kim Eun Jun

Classifications

• H04N25/616 Primary

  Electricity · mapped topic

• H04N25/78

  Electricity · mapped topic

• H04N5/3575

  Electricity · mapped topic

• H04N5/378 Primary

  Electricity · mapped topic