Current sensing device and organic light emitting display device including the same

A current sensing device, comprising:

• a plurality of sensing units each of which is connected to different sensing channels, wherein each of the plurality of sensing units comprises:
• a reference current generator configured to generate a reference current;
• a current comparator configured to output a comparator output signal based on a pixel current input through any one of the sensing channels and the reference current, and to remove an offset deviation component included in the pixel current and the reference current by using a reset current externally applied;
• and
• an edge triggered data flip-flop configured to output a digital sensing value corresponding to the pixel current based on the comparator output signal, wherein the current comparator comprises:
• a first current-voltage converter configured to convert the pixel current into a pixel voltage and to convert the reset current into a reset voltage;
• a second current-voltage converter configured to convert the reference current into a reference voltage and to convert the reset current into a reset voltage;
• a first sampling capacitor configured to store a first correlated double sampling value free from the offset deviation component by double sampling the pixel voltage and the reset voltage;
• a second sampling capacitor configured to store a second correlated double sampling value free from the offset deviation component by double sampling the reference voltage and the reset voltage;
• and
• a comparing unit configured to generate the comparator output signal by comparing the first correlated double sampling value with the second correlated double sampling value.