Grating waveguide device for near-to-eye display

Abstract

The invention discloses a grating waveguide device for near-to-eye display. The grating waveguide device is composed of an optical substrate and a grating arranged on the surface of the optical substrate; the grating is divided into two incident grating regions, two turned grating regions and one outgoing grating region; two turned grating regions are arranged at one side of the outgoing grating region in parallel and at intervals; staggered gaps are arranged between adjacent sides of two returned grating regions, and two incident grating regions are arranged in the staggered gaps at intervals; two incident grating regions are mutually staggered, and diffraction light produced by two incident grating regions can form a beam without gap in the middle to conduct to the outgoing grating afterbeing diffracted by two turned grating regions. The grating waveguide device disclosed by the invention not only improves the lighting effect of the grating waveguide, obviously increases an angle field of view of the grating waveguide, avoids the center region of the outgoing grating of the grating waveguide device from dark band; and the light conduction is more uniform, and the excellent performance of the grating waveguide is guaranteed.

Description

technical field [0001] The invention relates to the field of near-eye display, in particular to a grating waveguide device for near-eye display. Background technique [0002] As virtual reality and augmented reality technologies are gradually recognized and accepted by people, near-eye display devices have developed rapidly. In the near-eye display device, the grating waveguide display technology uses the diffraction grating to realize the incidence, turning and exit of light, and uses the principle of total reflection to realize light transmission, and transmits the image of the microdisplay to the human eye, and then sees the virtual image. However, the current grating waveguide still has the problem of increasing the field of view to improve the efficiency of light energy transmission. [0003] The structure of the current grating waveguide device is as follows figure 1 shown. The whole device is composed of an optical substrate 106 and a grating on the surface of the ...

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Problems solved by technology

[0004] Based on the problems existing in the prior art, the object of the present invention is to provide a grating waveguide device for near-eye display, which can solve the problem of the existing grating waveguide device due to the large gap between the two turning gratings. The central area of ​​the exit grating produces a dark band, which seriously affects the working performance of the grating waveguide device

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