A diffractive optical waveguide display device

Abstract

The invention belongs to the field of AR optical waveguide display, and specifically relates to a diffractive optical waveguide display device, which includes a diffraction grating, a waveguide plate is arranged on one side of the diffraction grating, an image source is arranged on the other side of the diffraction grating, and the image source is The emitted light beam passes through the diffraction grating and enters into the waveguide plate. The diffraction grating includes periodically distributed liquid crystal microcapsules. The liquid crystal microcapsules are hollow spherical with an inner diameter of 10-60 nm and a surface thickness of 5-5 nm 30 nm, the liquid crystal microcapsules are used to increase the diffraction rate of s-polarized light and p-polarized light, so that both s-polarized light and p-polarized light can be totally reflected in the waveguide plate, so as to improve the output image of the waveguide plate The role of clarity. The technology provided by the invention can intuitively, concretely and numerically improve the definition of the image source, and also has advantages in terms of maximum brightness, resolution, ambient light contrast, energy consumption, service life, response speed and thermal stability. .

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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