The liquid crystal grating includes a first substrate and a second substrate arranged opposite to each other, and a liquid crystal layer arranged therebetween. The liquid crystal grating further includes: a plurality of first electrodes having a first extension direction and arranged parallel to each other and on the first substrate; and a plurality of second electrodes having a second extension direction and arranged parallel to each other and on the second substrate. The first electrodes and the second electrodes cross each other and are configured to enable, under control of a first driving signal, the liquid crystal layer to form a first grating for the 3D display together with the display panel in a first direction, and to enable, under control of a second driving signal, the liquid crystal layer to form a second grating for the 3D display together with the display panel in a second direction.