Spherical-prism-based optical system of head display

Abstract

The invention discloses a spherical-prism-based optical system of a head display, and the system at least comprises a spherical prism, a spherical lens and a micro display, wherein light emitted by the micro display sequentially passes through the spherical prism and the spherical lens and then enters pupils of eyes in a collimation manner; for the direction from the pupils of the eyes to the micro display, the light sequentially passes through a first surface, a second surface, the first surface and a third surface of the spherical prism, then enters a first surface and a second surface of the spherical lens, and finally enters the micro display, the first surface of the spherical prism is a concave transmitting surface, the second surface of the spherical prism is a concave reflection surface, and plays a role in amplifying an image, and a reflection layer is plated on the outer side of the spherical prism; the third surface of the spherical prism is a concave transmitting surface; the spherical lens is a single lens; and the spherical prism and all optical surfaces of the spherical lens are spherical surfaces. The spherical-prism-based optical system has the advantages of being easy to process and saving the processing time and cost because the spherical surfaces are used on the surfaces of all optical elements.

Description

technical field [0001] The invention relates to the field of optical technology, especially the field of optical system and device design, and is applicable to the fields of virtual reality and augmented reality. Background technique [0002] Head Mounted Display (HMD) is divided into half-projection type and full-projection type. It can enlarge the image generated by the small two-dimensional display through the optical system, and display the collimated image to infinity or a place far enough away. , into a screen effect tens of meters away. Since the head-mounted display device is mounted on the observer's head, it must be compact and lightweight to reduce the load on the observer. With the increase of the observation field of view, the observation range will also increase, and the observer can observe high-quality dynamic images more fully. For head-mounted display systems, a large field of view is also very important. The field of view, exit pupil diameter, and focal...

AI Technical Summary

Problems solved by technology

However, since the FFSM optical system only uses one kind of glass material, it cannot correct chromatic aberration and realize broadband display

[0005] Chinese patent CN 102012563A discloses a head-mounted display optical system based on a free-form surface prism, which introduces binary optical elements on the basis of FFSM, and solves the problem that a kind of glass cannot correct chromatic aberration

However, the processing of FFSM itself is very difficult. If the binary optical surface is introduced, it will be extremely difficult to process, or the cost will be doubled, or even impossible.

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