Waveguide module, waveguide-based display module and near-to-eye display device

Abstract

The invention discloses a waveguide module, a waveguide-based display module and a near-to-eye display device. Based on the principles of wavelength division multiplexing and polarization beam splitting, an optical fiber scanning module modulates a mixed light beam containing at least two groups of sub-view-field images with different wavelengths, the light with specific wavelength is polarized toa coupling state through a polarization state generator, and the light is coupled to the corresponding waveguide through a coupling-in unit. The waveguide module comprises multiple layers of waveguides, light in different wavelength ranges is coupled to each layer of waveguides, and emergent images formed after a to-be-displayed image mixed light beam generated by the optical fiber scanning module is coupled out through a waveguide module coupling-out unit are spliced into a to-be-displayed image. According to the invention, a brand-new idea is used to solve the problem of considering both large field of view and miniaturization of the near-to-eye display module.

Description

Technical field [0001] The invention relates to the field of display, in particular to a waveguide module, a waveguide-based display module and a near-eye display device. Background technique [0002] Most of the existing near-eye display modules applied in the field of Augmented Reality (AR) have the problem that the field of view is not large. Take the waveguide-based display module in the prior art as an example: the existing waveguide-based display Modules generally include image source 1, eyepiece system 2, in-coupling grating 3, waveguide 4 and out-coupling grating 5, such as figure 1 Shown. After the light beam emitted by the image source 1 is collimated by the eyepiece system 2, it is coupled into the waveguide 4 at a certain angle through the coupling grating 3 for total reflection transmission, and the coupling-out grating 5 set in the waveguide corresponding to the exit pupil position transmits it in the waveguide The beam of light is coupled out to the human eye. Si...

AI Technical Summary

Problems solved by technology

[0003] In the Chinese patent CN107024769, we can see that the existing technology has thought of using the splicing method to expand the field of view. This splicing method needs to add a set of corresponding input light source modules for each additional splicing of a group of field of view angles. It is a hardware-stacked splicing scheme, which prevents the size of the near-eye display module from being miniaturized

Images