Liquid crystal display panel

A liquid crystal display panel, comprising a pixel area comprising a plurality of sub-pixels of different colors, wherein the liquid crystal display panel comprises:

• a glass substrate;
• a grating structure disposed on the glass substrate, comprising a plurality of sub-gratings corresponding one-to-one to the plurality of the sub-pixels of different colors, and each of the sub-gratings comprising a plurality of layers with a same thickness;
• a planarization layer disposed on the grating structure and covering the grating structure;
• a thin-film transistor layer disposed on the planarization layer;
• and
• a liquid crystal layer disposed on the thin-film transistor layer;
• wherein thicknesses and refractive indexes of ones of the plurality of the sub-gratings corresponding to ones of the plurality of the sub-pixels of different colors are different.