Patent ID: 11899203
Assignee: JIAXING UPHOTON OPTOELECTRONICS TECHNOLOGY CO., LTD.
Field: Optics (Instruments)
Classification: CPC G | IPC F  G

Claim 2:
3. A design method of an augmented reality AR optical waveguide, the AR optical waveguide comprising a coupling-in grating, an optical waveguide body, and a coupling-out grating, and the design method characterized by comprising: optimizing grating parameters of the coupling-in grating according to an angle at which a light bean is incident to the coupling-in grating and a wavelength of the light beam, the grating parameters comprising a grating period, a grating depth and a grating duty ratio; determining a grating period and a grating depth of the coupling-out grating according to the grating period and the grating depth of the coupling-in grating: partitioning the coupling-out grating by employing a design method of the coupling-out grating; and obtaining grating duty ratios of respective partitions of the coupling-out grating by taking a total coupling-out optical power and non-uniformity of the coupling-out grating as optimization objectives, wherein the design method of the coupling-out grating comprises: calculating a diffraction coupling-in angle, at which a light beam is diffracted and coupled into the optical waveguide body through the coupling-in grating, according to an angle at which the light beam is incident to the coupling-in grating, a wavelength of the light beam and a grating period of the coupling-in grating; calculating a distance between two adjacent coupling-out positions of the light beam on the coupling-out grating according to the diffraction coupling-in angle and a thickness of the optical waveguide body; calculating a brightness difference rate of the light beam after being coupled out multiple times through the coupling-out grating according to a maximum diffraction efficiency of the coupling-out grating; and calculating a number of partitions of the coupling-out grating according to a length of the coupling-out grating, a sensitivity of a human eye to the light beam, the brightness difference rate, and the distance between the two adjacent coupling-out positions.