A waveguide-based display module and its image generation module and application

Abstract

The invention discloses a waveguide-based display module and its corresponding image generation module. Based on the principle of wavelength division multiplexing, the image generation unit modulates a mixed light beam containing at least two groups of sub-images with different wavelengths; The mixed light beam modulated by the image generating unit is coupled into the waveguide module. The waveguide module has a multi-layer in-coupling unit and a multi-layer out-coupling unit, and each layer of in-coupling unit is configured to couple in different wavelength ranges of light. The image The image to be displayed generated by the generation unit is spliced ​​into the image to be displayed after the mixed light beams are coupled out by the waveguide module coupling unit. The invention solves the problem of both large field of view and miniaturization of the near-eye display module with a brand-new idea.

Description

technical field [0001] The invention relates to the field of display technology, in particular to an optical fiber scanning module, a flat display screen, a MEMS scanning module, a waveguide-based display module and a display device. Background technique [0002] Most of the existing near-eye display modules used in the augmented reality (Augmented Reality, AR) field have a small field of view. Take the waveguide-based display module in the prior art as an example: the existing waveguide-based display The modules generally include an image source 1, an eyepiece system 2, an in-coupling grating 3, a waveguide 4 and an 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 grating 5 set in the waveguide corresponding to the exit pupil position transmits the ...

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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

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