An image display device includes a rear cover to receive a display panel. The ring binder is assembled by the insertion of the binder connector tabs into slots of the binder cover and then into the indents of the ring assembly support. An operating unit for performing the control operation of the display content of the screen is provided at a portion of the lower half portion that is exposed even when the upper half portion overlays the lower half portion. The second stopper bolt is movable with respect to the first stopper bolt. The invention may be most advantageously used with queries in structured query language and in relational databases. RF signals may be applied to the main electrodes and to the compensation electrode.