Waveguide diffraction device and display glasses

Abstract

The invention relates to a waveguide diffraction device and display glasses. The waveguide diffraction device comprises: a diffraction waveguide which comprises a pupil entrance region, a first pupil expansion region, a second pupil expansion region and a pupil exit region, wherein the first pupil expansion region is located at the horizontal side of the pupil entrance region, the second pupil expansion region is located at the lower side of the pupil entrance region, and the pupil exit region is located at the light path overlapping part of the first pupil expansion region and the second pupil expansion region, the pupil entrance region is provided with two pupil entrance gratings, the first pupil expansion region and the second pupil expansion region are both provided with pupil expansion gratings, and the pupil exit region is provided with two pupil exit gratings; and a projection light machine which is used for emitting first incident light and second incident light which are different in wavelength, wherein the first incident light enters the first entrance pupil grating, is diffracted by the first pupil expanding grating and is emitted out of the first pupil exit grating, the second incident light enters the second entrance pupil grating, is diffracted by the second pupil expansion grating, and is emitted by the second pupil exit grating, and two pieces of pupil exit light emitted by the two pupil exit gratings are combined in the exit pupil region to form a color image. According to the application, the single waveguide can realize color display, and the color uniformity and the light emitting brightness can be ensured.

Description

technical field [0001] The present application belongs to the field of display technology, in particular to a waveguide diffraction device and display glasses. Background technique [0002] With the advancement of imaging technology, people's demand for immersive experience is getting higher and higher. In recent years, the development of VR / AR technology has gradually satisfied people's pursuit of visual experience. Head-mounted devices can free people's hands, reduce dependence on screens, and create better visual effects. For head-mounted devices, near-eye display is the key to its technology, and imaging quality and thinness are the main considerations. 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 transmitted to the human eye through the optical transmission system. Here, unlike VR’s blocking of the external environment, AR needs to have a certain transmittance...

AI Technical Summary

Problems solved by technology

[0005] This application provides a waveguide diffraction device and display glasses to solve the problems of large volume and weight of the waveguide and low display transmittance during color display

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