Optical system of light and small-sized big angular field free curved surface prism helmet display

Abstract

The invention relates to a small and light wide-field free-form surface prism HMD optical system, which belongs to the field of optical system and device design and is applied to the virtual reality and augmented reality field. The invention comprises a free-form surface prism with three optical surfaces, and a micro-image display; the free-form surface prism is made of plastic glass materials with the refractive index greater than 1; the three free-form optical surfaces are concave surfaces, which meet one of the three surface-type equations, and the location relationship of each surface meets three condition equations; the incident angle formed between the widest-field upper edge rays emitted by an LCD and the second free-form surface meets the total reflection conditions; and an image source element is an LCD of 0.61 or 0.59 inches. The small and light wide-field free-form surface prism HMD optical system is light and compact and has the advantages of good aberration correction and high light energy utilization rate; the optical system enables the observer to see clear images in a wide field of view, and the displayed images do not have apparent brightness attenuation and can not easily cause visual fatigue to the observer.

Description

technical field [0001] The invention relates to a free-form surface prism type head-mounted display optical system, belongs to the field of optical system and device design, and is suitable for the fields of virtual reality and augmented reality. Background technique [0002] In recent years, virtual reality (Virtual Reality, referred to as VR) and augmented reality (Augmented Reality, referred to as, AR) head-mounted image display devices have made great progress. Since these head-mounted display devices are installed on the observer's head, it must be compact and lightweight to lighten 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. A large field of view is also very important for a head-mounted display system. The field of view, exit pupil diameter, and focal length of the HMD optical system are mutually restrictive. It is very di...

AI Technical Summary

Problems solved by technology

[0013] In order to overcome the deficiencies of the above-mentioned optical system patents of the existing helmet-mounted display, the present invention proposes a free-form surface prism type helmet-mounted display optical system with a large exit pupil diameter, a large field of view, and a short focal length. With the advantages of high utilization rate, it aims to solve the problem that the F number of the optical system of the head-mounted display is too large. At the same time, the size is very small and the weight is very light. The helmet image display device can ensure that the observer can see clear images in a large field of view, and The displayed image has no obvious brightness attenuation, which is not easy to cause visual fatigue of the observer

Images