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Waveguide element and waveguide stack for display applications

A technology of display components and waveguides, applied in optical components, computer monitor casings, light guides, etc., can solve problems such as use restrictions and achieve the effect of preventing cross-coupling

Active Publication Date: 2020-09-11
DISPELIX OY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Typically, surface relief gratings are not very sensitive to polarization over a large field of view (FOV), which can cause cross-coupling between plates and cause color variations on a uniform white image
[0003] Some conventional in-coupling solutions also require a relatively large area on the waveguide and / or place some undesired constraints on the waveguide form factor, limiting their usefulness in practical applications

Method used

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  • Waveguide element and waveguide stack for display applications
  • Waveguide element and waveguide stack for display applications
  • Waveguide element and waveguide stack for display applications

Examples

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Embodiment Construction

[0022] In one embodiment, the method includes exclusively in-coupling only wavelengths below a threshold using an in-coupler that splits the FOV in two by + / - 1st diffraction order and exhibits a small grating period such that Wavelengths above the threshold experience only zeroth order diffraction.

[0023] exist figure 1 This is exemplified in , which shows the wave vector analysis of an in-coupled grating with a grating vector parallel to the y-axis. Assume the light guide has a refractive index of 2.0, it lies in the xy plane, and the virtual image has a diagonal FOV of 52 degrees and an aspect ratio of 16:9. + / - level 1 moves the FOV box from the center into the torus. The inner radius of the ring is defined by the refractive index of air (=1.0) and the outer radius is defined by the refractive index of the waveguide (=2.0). The FOV points inside the ring propagate via total internal reflection inside the waveguide. The FOV points outside the torus are disabled modes ...

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Abstract

The invention relates to a waveguide display element comprising a waveguide body and an in-coupling grating arranged to the waveguide body. The in-coupling grating is configured to couple incoming light into the waveguide body into two separate directions using opposite diffraction orders for splitting the field of view of the incoming light. Further the in-coupling grating is configured, typically by setting its period suitably short, such that said coupling takes place only at wavelengths below a threshold wavelength residing in the visible wavelength range. The invention also relates to a waveguide stack.

Description

technical field [0001] The present invention relates to waveguide-based displays. In particular, the present invention relates to light coupling arrangements for such displays. The present invention can be used in modern personal displays, such as head mounted displays (HMDs) and heads-up displays (HUDs). Background technique [0002] To maximize the field of view of diffractive waveguide-based see-through augmented reality (AR) displays, a common approach is to use multiple waveguides stacked on top of each other. To make the optimization process manageable, it is desirable to in-couple only a single wavelength (eg, a laser) or narrow wavelength band (eg, the spectrum of a monochromatic LED) per light guide. Some polarization-based methods have been proposed previously, eg in US2014 / 0064655A1. Typically, surface relief gratings are not very sensitive to polarization over a large field of view (FOV), which can lead to cross-coupling between plates and color variations on ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G02B27/00G02B27/01G02B27/42G02B6/00G02B5/18G02B27/10
CPCG02B27/0172G02B27/4272G02B27/0081G02B2027/0174G02B27/1006G02B27/1086G02B6/0076G02B5/1823G02B5/1842G02B5/1861G02B27/4205G02B6/29323G06F1/1607
Inventor 卡西米尔·布卢姆斯泰特尤索·奥尔科宁
Owner DISPELIX OY
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