The reasons and conditions resulting in color aliasing of display images by subpixel sampling technology are analyzed in detail from the subpixel arrangement(SPA) of color matrix displays.This paper points out the relationship between color aliasing and SPA,and concludes that the color aliasing,to any kind of SPA,just occurs at the regions of images which have parallel error directions of SPA and with the frequencies above the Nyquist one.According to human vision system,a novel estimating method to color aliasing based on color blending of regions is proposed.This method minimizes bending color errors in the regions covered by structure basis element based on the original image color,accumulates the errors,and takes some statistics of the accumulation results as the measure of color deviation between the original image and the display image.And the calculations which can reflect the effects of subpixel sampling on color blending problems agree with the results of simulation experiments.