1. A method for displaying a three-dimensional image, comprising: receiving a left-eye gray level image array and a right-eye gray level image array; converting the left-eye gray level image array and the right-eye gray level image array into a left-eye luminance image array and a right-eye luminance image array respectively; receiving a compensation array; adjusting the right-eye luminance image array according to the left-eye luminance image array and the compensation array; converting the adjusted right-eye luminance image array into an adjusted right-eye gray level image array; and displaying the adjusted right-eye gray level image array on a display platform.