1. An image display device which comprises an image display panel, in which two or more groups of particles having different colors and different charge characteristics are sealed between two substrates, at least one of two substrates being transparent, and, in which the particles, to which an electrostatic field produced by a pair of electrodes provided on one or both substrates is applied, are made to fly and move so as to display an image, wherein an image including a plurality of display elements is formed by: applying an electric field pattern between the electrodes, the electric field pattern serving to fly particles A to the substrate at an image display side; and applying an inversion electric field pattern with respect to the electric field pattern, the inversion electric field pattern serving to fly particles B having different colors and different charge characteristics with respect to those of the particles A to the substrate at an image display side in order to eliminate the need for an image deleting process prior to forming the image, wherein, the image is provided in a matrix display, and the image is formed by sequentially applying the electric field pattern and the inversion electric field pattern to a portion of the matrix display where the display is rewritable, then applying the electric field pattern and the inversion electric field pattern to another portion of the matrix display; wherein, in the matrix display, the image is formed by first applying the electric field pattern to a group of electrodes in a portion where the display is rewritable, then applying the inversion electric field pattern to the other electrodes of the same portion which are opposite from the electrodes to which the electric field pattern is applied, and then sequentially applying the electric field pattern and the inversion electric field pattern to other portions of the matrix display.