Wide Bandwidth, High Uniformity Cascaded Splitter Film Array Waveguide and Its Application

Abstract

The invention provides a wide bandwidth, high uniformity cascade splitting film array waveguide and its application. The cascaded light-splitting film array waveguide includes a multi-layer glass substrate and a light-splitting film array sandwiched between two adjacent substrates. The structure of each light-splitting film array is independently: α 1 Hβ 1 L / α 2 Hβ 2 L / ...α n‑1 Hβ n‑1 L / α n Hβ n L, where H is a film layer of high refractive index material, L is a film layer of low refractive index material, the number of layers of each light-splitting film array is 2n, and the thickness of each film layer in the light-splitting film array is α n , β n Select based on bandwidth and beam angle requirements. By adopting the solution of the present invention, the single-chip combiner of the traditional video transmission-type augmented reality optical system is split into multiple pieces, breaking through the shackles of the mutual restriction of the utilization rate of light energy of the virtual image and the transmittance of the external real scene. When the external transmittance reaches more than 75%, the light energy utilization rate of the miniature image source reaches 70%.

Description

technical field [0001] The invention relates to the field of optical display, in particular, the invention relates to a cascaded light-splitting film array waveguide with wide bandwidth and high uniformity and its application. Background technique [0002] In recent years, a large number of head-mounted visual devices have emerged, such as Lenovo glasses, Google glasses, virtual reality (VR) gaming glasses, etc., virtual reality (Virtual Reality, VR), augmented reality (Augmented Reality, AR) and mixed reality (Mixed Reality, MR) technology gradually enters our daily life. A head-mounted display (HMD, also known as a head-mounted visual device) reflects a two-dimensional image directly into the eyes of the viewer, specifically through a set of optical systems (mainly precision optical lenses) to enlarge the ultra-micro display The image on the screen projects the image on the retina, and then presents the large-screen image in the eyes of the viewer. In terms of imagery, it...

AI Technical Summary

Problems solved by technology

Single-layer coupler transmission optical schemes such as free-form surface prisms and eyepiece transmissions, on the one hand, have large volumes, and it is difficult to meet the large field of view and large exit pupil diameter at the same time

On the other hand, the sum of the light energy utilization rate n and the external transmission m of the single-layer coupler must be lower than 100%. When the light energy utilization rate is too high, the optical system has poor permeability, making it uncomfortable to use and affecting the indoor environment. Experience effect, when the external transmittance m is high, the utilization rate of light energy is low, the brightness of the virtual image is low, and it is difficult to meet the outdoor application occasions

Images