Diffraction optical waveguide display device

Abstract

The invention belongs to the field of AR optical waveguide display, and particularly relates to a diffraction optical waveguide display device which comprises a diffraction grating, a waveguide sheet is arranged on one side of the diffraction grating, an image source is arranged on the other side of the diffraction grating, and a light beam emitted by the image source penetrates through the diffraction grating and enters the waveguide sheet. The diffraction grating comprises liquid crystal microcapsules which are periodically distributed, the liquid crystal microcapsules are in a hollow sphere shape, the inner diameter of each liquid crystal microcapsule is 10-60 nm, the surface thickness of each liquid crystal microcapsule is 5-30 nm, and the liquid crystal microcapsules are used for improving the diffraction rate of s polarized light and p polarized light, so that the s polarized light and the p polarized light can be totally reflected in the waveguide sheet; and therefore, the definition of the output image of the waveguide sheet is improved. According to the technology provided by the invention, the image source definition can be intuitively, specifically and digitally improved, and the method has the advantages in the aspects of maximum brightness, resolution, ambient light contrast, energy consumption, service life, response speed, thermal stability and the like.

Description

technical field [0001] The invention belongs to the field of AR optical waveguide display, and in particular relates to a diffractive optical waveguide display device. Background technique [0002] Optical waveguide display technology is an important development direction in the field of AR. Holographic volume gratings are usually prepared by holographic exposure of photosensitive materials with coherent lasers. Due to their advantages of high diffraction efficiency, low cost, and easy large-scale production, they are expected to be applied to optical waveguide AR displays based on holographic volume gratings. Polymer-dispersed liquid crystal holographic volume grating is a holographic volume grating based on polymer / liquid crystal composite materials. It not only has excellent optical properties, but also has electro-optic responsiveness. It has attracted extensive attention in the industry and is very commercially applied in optical waveguide AR displays. potential. On t...

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Problems solved by technology

) This will lead to the fact that when PDLC-VHG is matched with an image source that emits unpolarized light such as a micron light-emitting diode, only p-polarized light is coupled into the optical waveguide and then coupled out into the human eye, while most of the s-polarized light is directly transmitted by the waste (such as image 3 ), resulting in a lower ACR

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