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 (A) 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 (A) scattered from outside of the liquid crystal grating into the frame region are emitted out from the frame region of the second substrate . <EOS>