A kind of optical waveguide structure and optical system

Abstract

An optical waveguide (301), comprising at least one first base (11) and an expansion waveguide (20). The first base (11) is connected to the expansion waveguide (20); the expansion waveguide (20) comprises multiple semitransparent films (a, b, c, d, e) that are parallel to each other and obliquely embedded in a substrate (22); at least one of the left and right sides of the optical waveguide (301) is provided with a light absorbing material; incident light (L1, T1) enters the expansion waveguide (20) and then multiple light rays (L2, L3, L4, L5, L6, T2, T3, T4, T5, T6) parallel to each other exit; after the incident light (L1, T1) enters the expansion waveguide (20) and is reflected by at least one semitransparent film (a, b, c, d, e), the reflected light enters the first base (11) and then is totally reflected by the first base (11) and propagated to the side of the optical waveguide (301) that is provided with the light absorbing material; or after the incident light (L1, T1) enters the expansion waveguide (20) and is reflected by at least one semitransparent film (a, b, c, d, e), the reflected light is propagated by the first base (11) to the side of the optical waveguide (301) that is provided with the light absorbing material. An optical system comprising the optical waveguide (301) can reduce ghost images, thereby improving imaging quality.

Description

technical field [0001] The invention relates to the field of optical waveguides, in particular to an optical waveguide structure and an optical system. Background technique [0002] Head-Mounted Display (HMD) has been widely used in military, industrial, medical and other fields due to its immersion, interactivity and ability to improve situational awareness. With the increasing maturity of microdisplay technology, optical processing technology and optical design theory, HMD is developing towards miniaturization. [0003] In view of the special requirements for wearing on the head, the existing penetrating HMD usually adopts a combination of a foldback relay structure and an off-axis reflection combination mirror. Although the foldback relay structure enables the HMD to obtain a large exit pupil, the use of off-axis reflective combination mirrors greatly increases the difficulty of system off-axis aberration correction. It can be seen that the combination of the combined m...

AI Technical Summary

Problems solved by technology

Holographic waveguide uses holographic technology and optical waveguide concept to realize display, but the light energy utilization rate of the system is low, the preparation of holographic grating is difficult, and the stray light and dispersion introduced by diffraction seriously hinder its development.

The semi-permeable film array waveguide uses the principle of geometric optics catadioptric reflection to realize the display. The dispersion is small and it is easy to realize the color display. Therefore, the design and production requirements are far lower than the holographic waveguide display, but the traditional semi-permeable film array waveguide causes serious ghost images. Affect image quality

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