The invention discloses a method for driving
liquid crystal slit gratings, which is applied to three-dimensional display devices. A
liquid crystal slit
grating of a three-dimensional
display device comprises a first substrate and a second substrate, wherein the first and second substrates are superimposed together, each substrate is provided with a plurality of mutually parallel strip electrodes, and the plurality of strip electrodes of the first substrate and the plurality of strip electrodes of the second substrate are perpendicular to each other and constitute an array-type grid
electrode array. The driving method comprises the following step that: when the driving
voltage difference between two substrates which are perpendicular to each other and arranged on the first and second substrates exceeds a
threshold voltage of a
liquid crystal panel, sub pixels corresponding to the positions on the liquid
crystal panel and perpendicular to the two electrodes are driven. The method disclosed by the invention has the advantages that the co-fusion of 2D (two dimension) and 3D (three dimension) is realized, and a 3D visual window can be arbitrarily dragged to change the
grating distance and the angle, so that the 3D visual window is matched with an image to be displayed, thereby achieving a good display effect and realizing the
horizontal and vertical scanning of liquid
crystal gratings; and through cooperating with the
fast switching of signals of the liquid
crystal panel, the full high-definition display in the
horizontal and vertical directions is realized.