Provided are a display controller for improving display noise, a semiconductor integrated circuit (IC) device including the same, and a method of operating the display controller. The display controller may include image processing logic configured to sequentially read a plurality of input image data via a data bus and process the plurality of input image data. The display controller may also include a timing generator configured to output a timing control signal. Further, the display controller may include a compensation image generator configured to generate and output a compensation image according to the timing control signal. The display controller may also include a data interface unit configured to transmit one of the compensation image and the plurality of input image data to the display device based on the timing control signal.