Display device and display method thereof

Abstract

A display device and a display method thereof are provided. The display device includes: a first base substrate and a second base substrate which are arranged oppositely and a liquid crystal layer between the first base substrate and the second base substrate, the display device further includes: a waveguide grating between the liquid crystal layer and the first base substrate, the waveguide grating including a waveguide layer and a grating layer on one side of the waveguide layer facing the liquid crystal layer, and the grating layer being in contact with the liquid crystal layer; and a collimation light source on a lateral surface of the waveguide layer, light emitted by the collimation light source being coupled into the waveguide layer and output from the grating layer.

1 . A display device, comprising: a first base substrate and a second base substrate which are arranged oppositely, and a liquid crystal layer between the first base substrate and the second base substrate, wherein the display device further comprises:
 a waveguide grating between the liquid crystal layer and the first base substrate, wherein the waveguide grating comprises a waveguide layer and a grating layer on a side of the waveguide layer which faces the liquid crystal layer, and the grating layer is in contact with the liquid crystal layer; and   a collimation light source on a lateral surface of the waveguide layer, wherein a light emitted by the collimation light source is coupled into the waveguide layer and output from the grating layer.   
     
     
         2 . The display device according to  claim 1 , wherein a refractive index of the liquid crystal layer is changed between a maximum refractive index and a minimum refractive index under a driving signal of the display device; and a refractive index of the grating layer is greater than or equal to the minimum refractive index of the liquid crystal layer, and smaller than or equal to the maximum refractive index of the liquid crystal layer. 
     
     
         3 . The display device according to  claim 2 , wherein the refractive index of the grating layer is equal to the minimum refractive index of the liquid crystal layer. 
     
     
         4 . The display device according to  claim 2 , wherein the refractive index of the grating layer is equal to the maximum refractive index of the liquid crystal layer. 
     
     
         5 . The display device according to  claim 1 , wherein the grating layer comprises: a grating unit arranged in an array, wherein the grating unit comprises a first grating sub-unit, a second grating sub-unit and a third grating sub-unit, the first grating sub-unit being configured for outputting a first primary color light in a direction facing human eyes, the second grating sub-unit being configured for outputting a second primary color light in a direction facing the human eyes, and the third grating sub-unit being configured for outputting a third primary color light in a direction facing the human eyes. 
     
     
         6 . The display device according to  claim 1 , wherein the grating layer comprises a plurality of grids, part of the grids are connected with each other to form a pixel electrode, part of the grids are connected with each other to form a common electrode, the part of the grids for forming the pixel electrode and the part of the grids for form the common electrode are alternately arranged. 
     
     
         7 . The display device according to  claim 1 , wherein the grating layer comprises a plurality of grids, the display device further comprises a common electrode, part or all of the grids of the grating layer are connected with each other to form a pixel electrode, and the common electrode is between the waveguide grating and the first base substrate. 
     
     
         8 . The display device according to  claim 1 , wherein the grating layer comprises a plurality of grids, the display device further comprises a pixel electrode, part or all of the grids of the grating layer are connected with each other to form a common electrode, and the pixel electrode is between the waveguide grating and the first base substrate. 
     
     
         9 . The display device according to  claim 1 , wherein liquid crystal molecules in the liquid crystal layer are nematic phase liquid crystal molecules. 
     
     
         10 . The display device according to  claim 9 , wherein the liquid crystal molecules in the liquid crystal layer are the nematic phase liquid crystal molecules, the display device further comprises a polarizer, and the polarizer is on one side of the liquid crystal layer distal to the waveguide layer. 
     
     
         11 . The display device according to  claim 9 , wherein the liquid crystal molecules in the liquid crystal layer are the nematic phase liquid crystal molecules, the display device further comprises alignment layers, and the alignment layers are on two opposite sides of the liquid crystal layer and is in contact with the liquid crystal layer. 
     
     
         12 . The display device according to  claim 1 , wherein the display device further comprises a pixel electrode and a common electrode, and the pixel electrode and the common electrode are on two opposite sides of the liquid crystal layer. 
     
     
         13 . The display device according to  claim 1 , wherein the display device further comprises a pixel electrode and a common electrode, and both the pixel electrode and the common electrode are on same side of the liquid crystal layer. 
     
     
         14 . A display method applied to the display device according to  claim 1 , comprising:
 scanning pixels in the display device row by row; and   while scanning one row of pixels, applying an electric field to the liquid crystal layer of the scanned pixels according to a gray scale value of each pixel, so that the refractive index of the liquid crystal layer of the pixels is between a minimum refractive index of the liquid crystal layer and a maximum refractive index of the liquid crystal layer.   
     
     
         15 . The display device according to  claim 1 , wherein liquid crystal molecules in the liquid crystal layer are blue phase liquid crystal molecules.