Reflection volume holographic grating waveguiding structure

Abstract

The invention discloses a reflection volume holographic grating waveguiding structure.The reflection volume holographic grating waveguiding structure comprises a plane light source (1), a flat panel wave guide(4), an incidence end grating and an emergence end grating, and the incidence end grating and the emergence end grating are arranged on the flat panel wave guide(4) and are in a mirror-image relation; the incidence end grating comprises a first reflection volume holographic grating (2) and a second first reflection volume holographic grating (3), while the emergence end grating comprises a third reflection volume holographic grating (5) and a fourth reflection volume holographic grating (6), incident light beams are subjected to bragg diffraction through the first reflection volume holographic grating (2) and the second first reflection volume holographic grating (3), emergent light beams are subjected to bragg diffraction through the third reflection volume holographic grating (5) and the fourth reflection volume holographic grating (6), and the light beams are emitted into human eyes (7).By means of the reflection volume holographic grating waveguiding structure, the range of an incidence angle can be enlarged, meanwhile, dispersion can be reduced, the view field can be enlarged, continuity of exit pupils is guaranteed, and thereby display quality is improved.

Description

technical field [0001] The invention relates to a volume grating waveguide structure in eye-wearing holographic display technology, in particular to a reflective volume holographic grating satisfying Bragg diffraction conditions. Background technique [0002] With the development of the micro-display industry, display devices are becoming miniaturized and personalized. In recent years, head-mounted display technology has received a lot of attention from the market. Head-mounted display devices represented by augmented reality (AR) and virtual reality (VR) have been extensively researched and developed and used in military and consumer markets. [0003] Due to the limitations of optical principles, traditional near-eye display devices are difficult to produce a larger exit pupil range while maintaining a large field of view (FOV). The waveguide display device uses the light in the waveguide medium to satisfy the principle of total reflection propagation. With the help of th...

AI Technical Summary

Problems solved by technology

The advantage of this structure is that it maintains the advantages of high transmittance, good monochromaticity, and wide color gamut of the holographic grating waveguide structure, but the complex design of this structure will also increase the thickness of the optical system.

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