Optical system with extra large view field for helmet mounted display (HMD)

Abstract

The invention discloses an optical system with an extra large view field for an HMD, relates to the optical system and device design field, and solves problems that distortion exists in structures of prior HMDs, large view fields are difficult to achieve, boundary parts among picture units are difficult to fuse, whole structures of systems are over complicated for a plurality of components are spliced, and systems have serious vignetting as exit pupils are small. The optical system comprises a first ellipsoidal surface, a second ellipsoidal surface, a relay optical system, a third lens assembly and an organic light emitting diode (OLED) screen, wherein the relay optical system is placed at a left focus of the first ellipsoidal surface, the left focus of the first ellipsoidal surface coincides with a right focus of the second ellipsoidal surface, and the third lens assembly is arranged at a left focus of the second ellipsoidal surface. Parallel light passing through an exit pupil is converged into the relay optical system after being reflected by the first ellipsoidal surface, light passing through the relay optical system is converged into the third lens assembly after being reflected by the second ellipsoidal surface, and light passing through the third lens assembly is imaged on the OLED screen. According to the optical system with the extra large view field for the HMD, human eye view fields are covered.

Description

technical field [0001] The invention relates to the field of optical system and device design, in particular to a large field of view head-mounted display optical system designed by using an ellipsoidal reflective surface, a diffractive surface and a free-form surface, which is suitable for virtual reality and entertainment fields. Background technique [0002] In recent years, virtual reality (Virtual Reality, referred to as VR) head-mounted image display devices have made great progress, but the development of panoramic large-field-of-view head-mounted display technology is facing technical challenges. The fields of view of the head-mounted displays that have been marketed are all in the range of 20° to 40°, which is far smaller than the visual range of the human eye. The human monocular field of view is basically 150°×120°. Since the two eyes of a person have overlapping fields of view, the total field of view of the two eyes of a person is 200°×120°. Although the most ...

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Problems solved by technology

[0003] The present invention solves the distortion in the structure of the existing head-mounted display system, it is difficult to realize a large field of view, it is difficult to fuse the boundary parts between image units, and the splicing of multiple components makes the overall structure of the system too complicated

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