Imaging module and augmented reality equipment

Abstract

The invention discloses an imaging module and augmented reality equipment. The imaging module comprises an optical machine, an optical waveguide and a diffraction imaging element; the optical waveguide comprises a light-transmitting substrate, an incident grating and an emergent grating, wherein the incident grating and the emergent grating are arranged on the light-transmitting substrate, and the incident grating is corresponding to the optical machine; and the diffraction imaging element is positioned on the light emitting path of the optical waveguide and is arranged opposite to the emergent grating. With the imaging module and augmented reality equipment of the invention adopted, the physical limitation of a product on the conditions of high refractive index and the like of the light-transmitting substrate material can be decreased, the field angle of the product can be increased, the lighting effect of the product can be improved, and the brightness uniformity of the product can be enhanced.

Description

technical field [0001] The invention relates to the technical field of optical equipment, in particular to an imaging module and augmented reality equipment. Background technique [0002] Augmented Reality (AR) technology is a technology that calculates the position and angle of camera images in real time and adds corresponding images, videos, and 3D models. The goal of this technology is to superimpose the virtual world on the screen. world and interact with it. [0003] Some augmented reality devices use an imaging module including an optical machine 20' and an optical waveguide 10'. refer to figure 1 A common optical waveguide 10' includes a light-transmitting substrate 11', and an incident grating 12' and an outgoing grating 13' arranged on the light-transmitting substrate 11'; a common optical machine 20' includes a microdisplay 21', and The imaging prism 22' or prism group on the front side of the micro-display screen 21', each pixel on the micro-display screen 21' ...

AI Technical Summary

Problems solved by technology

[0005] In addition, due to the sensitivity of the diffraction grating to the incident angle, the diffraction efficiency of light at different incident angles is also different, which causes the uneven distribution of display brightness within the FOV

In order to improve the brightness uniformity, the incident grating 12' is usually optimized to select design parameters with better angular uniformity, but in this way, the overall coupling efficiency will be sacrificed and the light efficiency of the product will be affected

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