Optical waveguide structure, optical module and head-mounted display device

Abstract

The embodiment of the invention provides an optical waveguide structure, an optical module and head-mounted display equipment. The optical waveguide structure comprises an optical waveguide, a coupling-out region and at least two coupling-in regions, wherein the coupling-out region and the coupling-in regions are arranged on the optical waveguide; the at least two coupling areas are used for coupling light rays with different colors; and the coupling-out region is used for coupling the light coupled by the at least two coupling-in regions out of the optical waveguide at different field angles. According to the scheme provided by the embodiment of the invention, the imaging view field range can be expanded while the light and thin optical waveguide is realized.

Description

technical field [0001] The embodiments of the present application relate to the technical field of near-eye display, and more particularly, the embodiments of the present application relate to an optical waveguide structure, an optical module, and a head-mounted display device. Background technique [0002] In AR (Augmented Reality, Augmented Reality) display, for example, an AR head-mounted display device usually uses an optical waveguide as a core component, and incident light can be transmitted in the optical waveguide according to the principle of total reflection. Wherein, a diffraction grating is arranged on the surface of the optical waveguide, and the diffraction grating is used for coupling light into the optical waveguide, or coupling light out of the optical waveguide for display imaging. [0003] In the existing related technologies, three-piece grating optical waveguides are usually used. In order to achieve color effects, there are currently two main solutions:...

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Problems solved by technology

[0003] In the existing related technologies, three-piece grating optical waveguides are usually used. In order to achieve color effects, there are currently two main solutions: one of which is to share a layer of optical waveguides for RGB, which is thin and light but the field of view will be limited. Only a small field of view can be achieved; another solution is to use a three-layer waveguide, which can achieve a medium and large field of view, but the thickness of the optical waveguide is relatively large

It can be seen that it is difficult to achieve both the light and thin optical waveguide and the large field of view, which largely limits the development and popularization of AR display technology.

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