Holographic waveguide lens and augmented reality display device

Abstract

The invention discloses a high photosynthetic efficiency holographic waveguide lens and an augmented reality display device. The high photosynthetic efficiency holographic waveguide lens comprises atleast one holographic waveguide lens unit, and the waveguide lens unit is composed of a waveguide substrate and two grating areas arranged on the waveguide substrate. No secondary turning needs to beperformed at the middle via a relay grating to transmit an optical signal, so that the difficulty of accurately matching phase conditions is greatly reduced, the gratings in the grating areas can adopt surface relief gratings and can be copied in batches through the nanoimprinting process. A reflecting element is placed on an emission end face of the holographic waveguide lens, so that the light originally lost from the end face continues to act with the emission grating, thereby effectively overcoming the shortcomings of low photosynthetic efficiency of the holographic waveguide. Furthermore,by means of the sizes of the two grating areas, the mutual distance, the structure of the gratings and the thickness size cooperation of a waveguide substrate, a function of once coupling in and multiple coupling output that is absent in the prior art can be achieved, and a pupil expansion function is achieved very conveniently.

Description

technical field [0001] The invention relates to the technical field of display equipment, and more specifically, to a holographic waveguide lens and an augmented reality display device. Background technique [0002] Augmented reality (AR) technology is to use computer graphics technology and visualization technology to generate virtual objects that do not exist in the physical world, and accurately "place" them in the physical world, presenting users with a new environment with richer perception effects. In many fields, such as industrial manufacturing and maintenance, medical field, military field, entertainment game field, education field, etc., it has huge potential application value. In the AR industry chain, lenses with both transparency and imaging / light-guiding effects are the most critical components for the implementation of AR hardware. Domestic and foreign industries or scientific research circles have developed a series of AR devices. For example, Google Glass u...

AI Technical Summary

Problems solved by technology

Due to the efficiency problem of the embossed grating itself, firstly, the single coupling efficiency is low, and secondly, at the end of the output unit, there is still a large amount of energy light exiting from the end face of the lens. Therefore, the waveguide lens based on the embossed grating generally has low light efficiency and low brightness. question

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