A method for operating a display apparatus includes: determining a maximum clipping area based on a viewing distance of a viewer; generating a first clipping point based on at least the maximum clipping area; determining a final clipping point based on at least the first clipping point; generating output image data based on the final clipping point and input image data; displaying an image corresponding to the output image data; generating a backlight control signal based on the final clipping point; and emitting backlight based on the backlight control signal, wherein the maximum clipping area includes a maximum area of a deterioration area that cannot be perceivable by a viewer according to the viewing distance.