Waveguide lens and AR display device

Abstract

The present invention discloses a waveguide lens which comprises a waveguide substrate and a functional area arranged on the upper surface of the waveguide substrate or composed of gratings, and the functional area comprises a coupling-in area used for coupling image light into the waveguide substrate and a relay area used for changing the direction of the image light transmitted by the coupling-in area, and is used for projecting the image light rays transmitted from the relay area into an external space; and the relay area comprises a middle turning area and edge turning areas, wherein the middle turning area is used for transmitting image light to the two sides so as to increase the horizontal view, and the edge turning areas are distributed on the two sides of the middle turning area and used for transmitting the image light transmitted by the middle turning area to the coupling-out area. The invention further discloses an AR display device which comprises the waveguide lens. By means of the structure, symmetrical view field expansion is achieved, the defect that one-way view field expansion is insufficient is overcome, and multi-color diffraction efficiency balance in the exit pupil range is achieved.

Description

technical field [0001] The present invention relates to the field of AR display technology, in particular to a waveguide lens and an AR display device. Background technique [0002] AR (Augmented Reality, Augmented Reality) technology is a new technology that "seamlessly" integrates real-world information and virtual world information. It not only shows real-world information, but also displays virtual information at the same time. Two kinds of information Complement and superimpose each other. In visual augmented reality, users use the helmet display to recombine the real world with computer graphics, and then they can see the real world surrounding it. [0003] For AR technology, since most of the user's field of view presents real scenes, how to recognize and understand real scenes and objects has become the primary task of AR perception interaction. In addition, the resolution (clarity) and field of view (also known as the field of view) of AR technology will also beco...

AI Technical Summary

Problems solved by technology

However, in the process of conduction from the in-coupling area to the turning area and from the turning area to the out-coupling area, only the first-order diffraction is used. In the case of polychromatic diffraction, there is a phenomenon of unbalanced diffraction in the field of view, resulting in obvious chromatic aberration and affecting Visual experience

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