Display device

Abstract

The invention discloses a display device which comprises a projection light machine and a diffraction optical waveguide. The diffraction optical waveguide comprises a substrate, and an entrance pupil element, a pupil expanding element and an exit pupil element which are arranged on the substrate. The projection light machine is arranged opposite to the entrance pupil element and is used for emitting a plurality of projection light beams into the entrance pupil element; the entrance pupil element comprises entrance pupil gratings corresponding to the projection light beams, and the entrance pupil gratings are used for inputting the projection light beams to the corresponding pupil expanding gratings; the pupil expanding element comprises a plurality of pupil expanding gratings corresponding to the entrance pupil gratings, and the pupil expanding gratings are located on output light paths of the entrance pupil gratings and used for inputting the projection light beams to the corresponding exit pupil elements; and each exit pupil element comprises a plurality of exit pupil gratings, and the exit pupil elements are located in an overlapping region of output light paths of the plurality of pupil expanding gratings and are used for coupling the projection light beams to form output light beams and outputting the output light beams. According to the invention, the display of colorful patterns can be realized through the single diffraction optical waveguide, and the characteristics of light weight, clear color and the like are realized.

Description

technical field [0001] The invention relates to the field of optical waveguide technology, in particular to a display device. Background technique [0002] With the advancement of virtual imaging technology, users' demand for immersive experience is getting higher and higher. In recent years, the development of VR (Virtual Reality, virtual reality) / AR (Augmented Reality, augmented reality) technology has further improved the viewing experience of users. Moreover, VR / AR glasses based on head-mounted devices can liberate people's hands, reduce dependence on screens, have more flexibility and interactivity, and create better visual effects. For head-mounted devices, near-eye display is the key to its technology, and the imaging quality and thinness of the lens are the main considerations in production and design. The near-eye display system is generally composed of an image far and near optical transmission system, and the image frame emitted by the image source is transmitte...

AI Technical Summary

Problems solved by technology

Although this solution can ensure the uniformity and brightness of the final image, it relies on multi-layer diffractive waveguides, which increases the wearing weight, and the user needs to carry a large load when wearing it, and also increases the production cost.

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