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The image quality enhancement driving method compensates the output channel non-uniformity by diffusing output voltage errors throughout adjacent channels with sharing several adjacent output driving circuits which have their own offset errors, resulting in increase in PSNR and reduction in the standard deviation. This paper presents a performance verification of the driving method by analyzing it mathematically and systematically. This paper also shows the experimental results that the errors due to the channel-to-channel random offsets become hardly noticeable when the proposed driving method is applied to an AMOLED driver IC. To optimize the tradeoff among the performance, design complexity, and the number of sharing output channels, we derive that the optimized number of sharing channels is 3 at 60 Hz frame rate using the concept of critical flicker frequency.