Disclosed is a module for correcting and applying an input value applied to a plurality of pixels in a display including a plurality of pixels. The module includes a processor configured to determine a plurality of unit blocks by dividing the plurality of pixels in a preset unit, receive the first input value for a current pixel included in a current block of the plurality of unit blocks, determine a middle input value of a real number, by correcting the first input value by applying a gain value and offset value assigned to the current block, compare the product of a decimal value indicative of the decimal part of the middle input value and the size of the current block with a root value corresponding to the current pixel, determine the final input value by performing rounding-up or rounding-off on the middle input value based on a result of the comparison, and apply the final input value to the current pixel and memory configured to store the gain value, the offset value and the root value.