The described technology relates generally to an organic light emitting display and a method for driving the same. According to an exemplary embodiment, an image is displayed by dividing one frame into a plurality of sub-fields, and a gamma curve is realized with a combination of a plurality of sub-fields respectively corresponding to a plurality of grays of image data so that image data can be compensated without adding a memory. In addition, the embodiment can extract the one combination by setting a combination of sub-fields that exceeds one frame time among the plurality of sub-fields to be an exception condition.