Abstract: A switchable grating and an application thereof are provided. The switchable grating includes two electrically conductive substrates and a switchable liquid crystal grating layer, which is disposed between the two electrically conductive substrates. When an electric field is applied to a presumption area of the switchable liquid crystal grating layer by the two electrically conductive substrates, the electric field could shift an orientation of a cholesteric liquid crystal molecule of the presumption area. When the electric field is removed, the cholesteric liquid crystal molecule still maintains the aforementioned orientation, thus decreasing energy consumption. When a display device manufactured by the aforementioned switchable grating switches an image to a 2D image or a 3D image, the display device has lower energy consumption.