Augmented reality display device and head-mounted equipment

Abstract

The invention provides an augmented reality display device and head-mounted equipment. The augmented reality display device comprises an optical machine and an optical waveguide. The optical waveguide comprises an optical waveguide sheet and two metasurface gratings; each of the two metasurface gratings comprises two strip-shaped units with the same height and different widths, the two strip-shaped units are arranged in parallel at a first distance to form a basic unit, and the basic units are periodically arranged at a second distance; the strip-shaped units in the two metasurface gratings are symmetrically arranged; under the condition that the height of the strip-shaped unit is larger than or equal to one third of the minimum wavelength of a light beam emitted by an optical machine, the light beam enters the first metasurface grating to deflect and generate a phase difference in direct proportion to the height of the strip-shaped unit, enters the optical waveguide sheet to deflect again and generate total reflection, and is emitted out of the second metasurface grating to be imaged in human eyes. According to the invention, the two metasurface gratings adopt a symmetrical structure, so that the light efficiency of different wavelengths and incident angles can be complementary, and the brightness of an image after pupil expansion is uniform.

Description

technical field [0001] The invention relates to the technical field of metasurfaces, in particular to an augmented reality display device and a head-mounted device. Background technique [0002] Augmented Reality (AR for short) is a brand-new human-computer interaction technology. Using augmented reality technology, it can simulate the real scene scene. It is an advanced computer human-computer interface with interactivity and conception as its basic features. The development of 5th Generation Mobile Communication Technology (5G for short), 6th Generation Mobile Communication Technology (6G for short), artificial intelligence, big data and other technologies has further promoted the development of AR devices. develop. The display device of an AR device usually consists of a micro-display and optical components. The display devices of AR devices currently on the market are mainly composed of various micro-displays and optical components such as prisms, free-form surfaces, B...

AI Technical Summary

Problems solved by technology

[0004] The present invention provides an augmented reality display device and a head-mounted device, which are used to solve the problems in the prior art that the optical waveguide is prone to produce dispersion and ghosting, as well as the problems of image leakage caused by multi-level diffraction and dizziness caused by binocular parallax. It can realize color display through a single optical waveguide, improve diffraction efficiency, effectively suppress multi-level diffraction, and obtain better imaging effects, which can meet the needs of AR equipment

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