A liquid crystal grating, comprising: a first substrate and a second substrate arranged opposite to the first substrate; and liquid crystal molecules filled between the first substrate and the second substrate, wherein the first substrate, the second substrate and the liquid crystal molecules are provided to define at least one grating unit, wherein each grating unit comprises: a display region; a frame region surrounding the display region; a first frame electrode located on the first substrate and arranged corresponding to the frame region, the first frame electrode comprising a plate electrode extending in a region corresponding to the frame region; and a second frame electrode located on the second substrate and arranged corresponding to the frame region, the second frame electrode comprising a plurality of frame-shaped electrodes, sequentially arranged from large to small, from outside to inside of the frame region, in a surrounding manner depending on the size thereof and electrically insulated from each other; wherein the first frame electrode and the second frame electrode are configured for forming a voltage difference, when displaying in the display region to control deflection of the liquid crystal molecules in the frame region, such that light rays scattered from outside of the liquid crystal grating into the frame region are emitted out from the frame region of the second substrate. a first substrate and a second substrate arranged opposite to the first substrate; and liquid crystal molecules filled between the first substrate and the second substrate, wherein the first substrate, the second substrate and the liquid crystal molecules are provided to define at least one grating unit, wherein each grating unit comprises: a display region; a frame region surrounding the display region; a first frame electrode located on the first substrate and arranged corresponding to the frame region, the first frame electrode comprising a plate electrode extending in a region corresponding to the frame region; and a second frame electrode located on the second substrate and arranged corresponding to the frame region, the second frame electrode comprising a plurality of frame-shaped electrodes, sequentially arranged from large to small, from outside to inside of the frame region, in a surrounding manner depending on the size thereof and electrically insulated from each other; a display region; a frame region surrounding the display region; a first frame electrode located on the first substrate and arranged corresponding to the frame region, the first frame electrode comprising a plate electrode extending in a region corresponding to the frame region; and a second frame electrode located on the second substrate and arranged corresponding to the frame region, the second frame electrode comprising a plurality of frame-shaped electrodes, sequentially arranged from large to small, from outside to inside of the frame region, in a surrounding manner depending on the size thereof and electrically insulated from each other; wherein the first frame electrode and the second frame electrode are configured for forming a voltage difference, when displaying in the display region to control deflection of the liquid crystal molecules in the frame region, such that light rays scattered from outside of the liquid crystal grating into the frame region are emitted out from the frame region of the second substrate.