Waveguide structure, display device and electronic equipment

Abstract

This application is applicable to the technical field of optical devices, and provides a waveguide structure, a display device, and electronic equipment. The waveguide structure includes a coupling-in area, an out-coupling area, and a transfer area; the transfer area includes N waveguide layers; the N is A positive integer greater than 1; the coupling area couples the incident beam to the transfer area, and the light coupled into the transfer area is divided into N parts according to the diffraction angle, and the beam with a relatively small diffraction angle propagates in the waveguide layer with a relatively large thickness. The invention improves the output energy and output range of the light beam.

Description

technical field [0001] The present application belongs to the technical field of optical devices, and in particular relates to a waveguide structure, a display device and electronic equipment. Background technique [0002] In the prior art, head-mounted display devices use planar optical waveguides as display devices, including grating optical waveguides or array optical waveguides. In order to realize the color imaging effect of the grating-type head-mounted display device, the existing technology adopts the multi-layer optical waveguide spectroscopic technology to transmit the light of RGB three colors respectively, and uses the critical condition of total reflection to filter the light of different wavelengths, so that the specific wavelength The light propagates in the designated waveguide layer. [0003] For the optical waveguide coupled by the grating, in addition to the change of the diffraction angle of the grating with the wavelength, it is also necessary to consid...

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Problems solved by technology

[0003] For the optical waveguide coupled by the grating, in addition to considering the change of the diffraction angle of the grating with the wavelength, it is also necessary to consider that the diffraction angle is affected by the field of view of the system. For beams of different fields of view, due to the difference in diffraction angle , the field of view of the exit pupil is also different, which will lead to the deterioration of the display effect of the waveguide, and the entrance pupil image cannot be clearly and completely output to the human eye, and because the in-coupling grating has a certain size, when part of the beam propagates in the waveguide, it will The phenomenon of re-coupling into the grating occurs, causing energy loss, and will also affect the display effect of the corresponding FOV

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