Diffractive optical device and terminal equipment

Abstract

The invention discloses a diffractive optical device and terminal equipment, and the diffractive optical device can be applied to the field of augmented reality (AR), such as AR equipment and head-up display (HUD) equipment. Or the method is applied to the field of virtual reality VR, such as VR equipment; or is applied to filters, optical splitters, spectrum detection equipment and the like. The diffractive optical device comprises a grating assembly periodically distributed in a first dimension, the grating assembly comprises N optical waveguides, the N optical waveguides comprise M optical waveguides periodically changing in a second dimension, and at least two optical waveguides in the M optical waveguides periodically changing in the second dimension are different in structure; the included angle between the second dimension and the first dimension is larger than 0 degree and smaller than 180 degrees, N is an integer larger than 1, and M is an integer larger than 1 and not larger than N. By means of the M optical waveguides which change periodically in the second dimension, light of a specific wave band at a specific angle can be selected, and narrow-band response and abnormal angle regulation and control can be achieved.

Description

technical field [0001] The present application relates to the technical field of diffractive optical devices, and in particular, to a diffractive optical device and terminal equipment. Background technique [0002] Augmented reality (AR) technology is a technology that integrates the real world and the virtual world, and can superimpose sensory experiences (such as vision, hearing, touch, etc.) that do not exist in the real world through computer-generated simulations. The real world scene is perceived by the user, so as to achieve a sensory experience beyond reality and realize the enhancement of the real world scene. AR technology has a wide range of application scenarios, and has been successfully used in military, industrial production, medical, education and other fields. In recent years, with the gradual popularization of 5G high-speed mobile communication technology, the application scenarios of AR technology for consumer terminals have been continuously developed, a...

AI Technical Summary

Problems solved by technology

At present, the optical stackers in existing AR systems are generally semi-reflective mirrors, polarizing beam splitters, waveguide lenses, etc. These types of optical stackers cannot achieve narrow-band response and control abnormal angle reflection at the same time, so AR systems are difficult to meet Under the condition of compact size, it has high transmittance to ambient light and high reflectivity to projected light.

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