HMD projection display optical system

Abstract

The invention provides an HMD projection display optical system. From an object side to an eye side, the HMD projection display optical system comprises an Lcos, a PBS prism, a first prism and a second prism, wherein the second prism is a convex surface prism, one face is a convex spherical surface, and an inclined surface opposite to the convex spherical surface is coated with a semi-reflecting semi-transmitting film; the second prism is gummed with an inclined surface of the first prism through the semi-reflecting semi-transmitting film; light generated by a light source at one surface penetrates through the PBS prism and then irradiates the Lcos to generate an image, and the light of the image sequentially realizes reflection through the PBS prism, transmission of the first prism, reflection of the convex spherical surface and reflection of the semi-reflecting semi-transmitting film and then enters the eye; the outside scene above the first prism transmits through the first prism and the second prism and enters the eye. The HMD projection display optical system has advantages of simple and compact structure, small prism thickness, small volume, light weight and high optical imaging quality.

Description

technical field [0001] The present invention relates to optical projection display technology, in particular to an HMD projection display optical system. Background technique [0002] Head-mounted display device (HeadMountDisplayHMD) light weight, better carrying comfort and high performance are the essential requirements of the current optical design, these factors make the design of its optical system is a very challenging task. HMD projection equipment first appeared in the military field. It can display tactical information in real time, assist target identification, and can also be used in night vision systems. With the continuous improvement of design concept, manufacturing level and micro-display technology, HMD projection equipment has become more and more miniaturized, and has gradually entered people's daily life. It has been widely used in entertainment, simulation training, surgery and other virtual reality technologies. each field. The optical system of HMD pr...

AI Technical Summary

Problems solved by technology

In the current literature on the optical system of HMD projection display equipment, the analysis of the optical system design basically adopts the traditional lens type or free-form surface / refraction-diffraction hybrid structure. The first mechanism is mostly a rotationally symmetrical eyepiece structure. Although the optical performance It can be close to the diffraction limit and correct distortion better, but the structure of multiple groups of lenses is complicated, the assembly and processing require high precision, and the volume and weight are also large. Wearing it for a long time will cause neck fatigue. / Hybrid mechanism design is difficult, takes a long time, and there are fewer manufacturers of components, and the price is expensive

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