Virtual and Augmented Reality Systems and Methods with Improved Diffractive Grating Structures

Abstract

Improved diffractive structures for 3D display systems are disclosed. The improved diffractive structure includes an intermediate layer between the waveguide substrate and the top grating surface. The top grating surface includes a first material corresponding to a first index of refraction value, the bottom layer includes a second material corresponding to a second index of refraction value, and the substrate includes a third material corresponding to a third index of refraction value.

Description

technical field [0001] The present disclosure relates to virtual reality and augmented reality imaging and visualization systems. Background technique [0002] Modern computing and display technologies have facilitated the development of systems for so-called "virtual reality" or "augmented reality" experiences, in which digitally reproduced images, or parts thereof, are presented to the user in such a way that they appear to be, or may be perceived to be, real. Virtual reality or "VR" scenarios typically involve the presentation of digital or virtual image information without transparency to actual real-world visual input. Augmented reality or "AR" scenarios generally involve the presentation of digital or virtual image information as an enhancement to the visualization of the actual world around the user. For example, refer to figure 1 , depicts an augmented reality scene (4), where a user of AR technology sees a realistic park-like scene (6) and a concrete platform (112...

AI Technical Summary

Problems solved by technology

If the accommodation response to a displayed point does not correspond to the virtual depth of that point, as determined by convergence and binocular depth cues for stereopsis, the human visual system may experience adaptation conflicts, resulting in unstable imaging, unwanted eye fatigue, Headaches, and almost complete lack of surface depth if no conditioning information

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