Planar waveguide optical display device with polarized light guiding

Abstract

The invention provides a planar waveguide optical display device with polarized light guiding, which includes an image display light source, a collimating lens group, a PBS polarization beam splitting prism group, a planar light guiding transmission substrate, a polarization conversion light guiding substrate and a small-angle coupling output noodle. Among them, the image display light source is used to emit display light waves to display the desired image, the collimator lens group collimates the light waves emitted by the light source, the PBS polarization beam splitter prism group is used to perform corresponding light splitting processing on the light waves, and the planar light guide transmission substrate The light wave coupled in will be reflected and propagated to form a total reflection light wave, the polarization conversion light guide substrate is used to realize the transformation of the polarization state of the light wave, and the small-angle coupling output surface is mainly used to couple the light wave out of the substrate and expand the field of view. The invention has the characteristics of compact structure, light and thin, large field of view, simple optical design and processing technology, and can be used not only for wearable display, but also for 3D naked-eye display, car navigation display, field map indication and other fields.

Description

technical field [0001] The invention relates to an optical display device, in particular to a planar waveguide optical display device which can be used for polarized light guiding of all-eye augmented reality. Background technique [0002] For head-mounted display optical systems, in order to reflect the effect of augmented reality, optical components are usually used to virtually display image information at a certain distance in front of the human eye, so that the wearer can observe the surrounding scenery while browsing the information. change so as not to affect normal behavior. For this reason, the wearable display optical system of augmented reality, in order to enable the wearer to obtain all the information from the display light source in time, usually requires the display system to have the characteristics of large field of view, light and thin structure, and uniform image brightness within the field of view. The traditional head-mounted display system is based on...

AI Technical Summary

Problems solved by technology

The disadvantage of this scheme is that due to the use of large-angle S light reflection and small-angle P light transmission, the projected area of ​​the reflection output surface on the bottom surface of the substrate is too small, which is not conducive to the expansion of the field of view, and at the same time increases the difficulty of design. The thickness of the device cannot be reduced

U.S. Patent US20100260455 uses a micro-sawtooth structure to expand the display field of view of the display device, but the overall thickness of the device is not reduced, and the overall appearance of the device is not good enough to bring comfort to the wearer.

In U.S. Patent No. 7,021,777, the expansion of the field of view of the display device and the thinning of the display device are achieved by using a light-conducting flat panel, but the technical solution is very difficult to implement in terms of the specific design and process of the device. The extended range of the display field of view is limited, these factors make the device unsuitable for mass production

[0004] Aiming at the above-mentioned technical defects, the present invention designs a polarized light-guiding planar waveguide optical display device to solve the problems caused by the weight and field of view of the traditional optical system

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