An image display device includes a smoothing unit that filters the image data
to be displayed. According to one aspect of the invention, only bright parts of
the image that are adjacent to dark parts are smoothed, thereby improving the sharpness
of dark dots and lines displayed on a bright background. According to another aspect,
different primary colors are smoothed with different characteristics, enabling
unwanted colored tinges to be removed from the edges of white areas. According
to still another aspect, smoothing moves the luminance centroids of all primary
colors in a direction in which the display screen is scanned, to reduce ringing
effects without needless loss of edge sharpness.
