US 12,253,673 B2
Optical waveguide element and control method thereof, display device and display method thereof
Sen Ma, Beijing (CN)
Assigned to BOE TECHNOLOGY GROUP CO., LTD., Beijing (CN)
Appl. No. 17/263,586
Filed by BOE TECHNOLOGY GROUP CO., LTD., Beijing (CN)
PCT Filed May 18, 2020, PCT No. PCT/CN2020/090821
§ 371(c)(1), (2) Date Jan. 27, 2021,
PCT Pub. No. WO2020/233543, PCT Pub. Date Nov. 26, 2020.
Claims priority of application No. 201910424358.X (CN), filed on May 21, 2019.
Prior Publication US 2021/0311313 A1, Oct. 7, 2021
Int. Cl. G02B 27/01 (2006.01); G02B 27/00 (2006.01); G02B 27/42 (2006.01); G02B 27/44 (2006.01)
CPC G02B 27/0172 (2013.01) [G02B 27/0179 (2013.01); G02B 27/4205 (2013.01); G02B 27/44 (2013.01); G02B 27/0093 (2013.01); G02B 2027/0178 (2013.01); G02B 2027/0187 (2013.01)] 18 Claims
OG exemplary drawing
 
1. An optical waveguide element, comprising:
an optical waveguide layer;
a first grating, overlapping with the optical waveguide layer and comprising at least one first sub-grating unit;
wherein the at least one first sub-grating unit is configured to be switchable between a diffraction state and a non-diffraction state, and the at least one first sub-grating unit in a diffraction state guides incident light in the optical waveguide layer out of the optical waveguide layer for display,
a plurality of first sub-grating units are provided, each of the plurality of first sub-grating units comprises a first control electrode to control a state of the first sub-grating unit, and the first control electrodes of at least two of the plurality of first sub-grating units are independent of each other, wherein
a diffraction efficiency of the plurality of first sub-grating units are set to be gradually increased along a propagation direction of light in the optical waveguide layer.