Holographic waveguide display device and augmented reality display device

Abstract

The invention relates to a holographic waveguide display device and an augmented reality display device. The holographic waveguide display device comprises an image source, a relay optical system, a coupling-in grating, a waveguide group and a coupling-out grating. The image source is used for displaying an image. The relay optical system is used for collimating an image displayed by the image source into the coupling grating. The coupling grating is used for coupling emergent light of the relay optical system into the waveguide group. The waveguide group comprises a plurality of waveguide plates which are arranged in a stacked mode, a semi-transparent and semi-reflective film is arranged between the different waveguide plates, and the waveguide group is used for transmitting coupled-in light to the coupling-out grating. And the coupling-out grating is used for coupling out the light transmitted to the coupling-out grating. Through the technical scheme, the secondary diffraction phenomenon can be eliminated and the discontinuity of an observed image can be considered at the same time.

Description

technical field [0001] The present disclosure relates to the technical field of augmented reality display, in particular to a holographic waveguide display device and augmented reality display device. Background technique [0002] The holographic waveguide combines the total reflection characteristics of the waveguide and the diffraction characteristics of the holographic grating to achieve a large field of view and large exit pupil image output, which can be applied to a new generation of helmet display systems, and it has a more compact overall quality and volume advantage. The holographic waveguide is to couple the parallel light with different angle information after passing through the optical system into the waveguide in the form of diffraction. When the total reflection condition is satisfied, the coupled parallel light propagates forward periodically in the way of total reflection. When it exits the holographic grating, it is coupled out by diffraction, and then ent...

AI Technical Summary

Problems solved by technology

As a result, the image light in the corresponding field of view of the secondary diffraction is missing, resulting in the loss of part of the field of view of the final displayed image, resulting in incomplete information of the displayed image.

On the other hand, when the pupil size is smaller than the light transmission period, the output beams of adjacent periods will be discontinuous when coupled out, resulting in discontinuity when the human eye observes the image within the exit pupil range of the system, forming a pupil gap

[0003] Therefore, in the holographic waveguide, both the elimination of the secondary diffraction phenomenon and the discontinuity of the observed image are taken into account, and an irreconcilable contradiction inevitably forms between the two.

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