Display device performing adaptive refresh

A display device comprising:

• a display panel including a plurality of pixels;
• a data driver configured to generate data voltages based on output image data, and to provide the data voltages to the plurality of pixels;
• and
• a controller configured to receive input image data and input frequency information from a host processor, and to provide the output image data to the data driver,
• wherein the controller is configured to:
• determine a target frequency by analyzing the input image data;
• determine a masking ratio based on an input frequency represented by the input frequency information and the target frequency;
• selectively output the input image data as the output image data by performing a masking operation on the input image data with the masking ratio;
• determine whether or not the input frequency of the input image data is changed, and whether or not an image represented by the input image data is changed;
• and
• in response to determining that the input frequency of the input image data is changed and also determining that the image represented by the input image data is changed based on a comparison of a representative value of previous frame data and a representative value of current frame data, not perform the masking operation on the input image data, and output the input image data as the output image data.