A waveguide display system

Abstract

A waveguide display system and method are provided. The system includes: an image source, used to generate an imaging beam; a relay collimation system, used to collimate the imaging beam into a first parallel light at the same angle; a coupler, used to collimate the first parallel light Coupled into the following waveguide to form the second parallel light; the waveguide is used to propagate the second parallel light to the following coupler in the form of total reflection; the coupler is used to diffract the second parallel light into converging the light, leaving the waveguide, and entering the following first polarization grating; the first polarization grating is used to divide the converged light into two beams of circularly polarized light with opposite rotation directions emerging at different angles; and the second polarization Two beams of circularly polarized light with opposite rotation directions are diffracted by the second polarization grating to produce two beams of laterally misaligned imaging beams and enter the eye. The system has a simple structure, and while realizing the retinal display, the diameter of the exit pupil is enlarged, and the external real scene can be viewed.

Description

technical field [0001] The invention belongs to the technical field of retinal projection display, and in particular relates to a waveguide display system and method. Background technique [0002] The goal of augmented reality technology is to superimpose computer-generated virtual images, scenes or system prompt information on the display technology of real scenes. This technology can apply virtual information to the real world, and effectively improve the user's perception and interaction experience of the real world through the information provided by the computer system, so it has received great attention from researchers. However, for a common head-mounted display system, there is a problem that the distance between the virtual display image and the actual scene does not match, that is, there is a contradiction between convergence and focus. Retinal projection display technology does not need to go through the focal length adjustment of the eye lens, and directly proje...

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Problems solved by technology

[0003] However, in retinal projection display technology, the display light passing through the pupil of the human eye converges to one point, so this type of display technology has the problem of small exit pupil diameter.

In order to expand the exit pupil diameter of the retinal projection display system, the human eye tracking system can be used to detect the position of the pupil of the human eye, and then project the converging point of the projection light to the pupil position, but this will increase the complexity and cost of the system, and the response speed Slower; there are also related technologies that use multiple light engines to modulate multiple exit pupils, and the optical fusion device splices the generated multiple exit pupils to increase the exit pupil range, but this will also increase the cost and power of the system. consumption

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