Two-dimensional exit pupil expansion waveguide near-to-eye optical display device

Abstract

The invention discloses a two-dimensional exit pupil expansion waveguide near-to-eye optical display device. The device comprises a miniature display screen, an ocular lens group, a vertical expansionwaveguide device and a horizontal expansion waveguide device. The miniature display screen and the vertical expansion waveguide device are respectively disposed on the focal plane and the emergent light path of the ocular lens group, and the ocular lens group is used for collimating beams emitted by the miniature display screen into parallel beams. The horizontal waveguide device is disposed on the emergent light path of the vertical waveguide device, and a horizontally coupled incident surface is parallel to the upper and lower surfaces of the vertical waveguide device. The vertical expansion waveguide device is used for increasing the vertical equivalent size of the parallel beams emitted by the ocular lens group, and the horizontal waveguide device is used for increasing the horizontalequivalent size of a vertically expanded beam to obtain a two-dimensional expanded beam and emitting the two-dimensional expanded beam to the pupils of the human eyes. The device can reduce the sizewhile expanding the angle of view, and irons out the defects of vertical axis aberration, curvature of field and distortion.

Description

technical field [0001] The invention relates to the technical field of optical display, in particular to a two-dimensional exit pupil expansion waveguide near-eye optical display device. Background technique [0002] Head-mounted displays (HMD for short) refer to sending optical signals to the eyes through various head-mounted displays, which can realize virtual reality (Virtual Reality, VR), augmented reality (Augmented Reality, AR), mixed reality (Mixed Reality) reality, MR) and other different effects are widely used in virtual reality systems to enhance users' visual immersion. In the optical display device, the head-mounted display for augmented reality allows people to project virtual images to the human eyes while viewing the surrounding environment. The projected virtual images can be superimposed on the real world perceived by the user. In military, industrial , Entertainment, medical treatment, transportation and other fields have important significance. [0003]...

AI Technical Summary

Problems solved by technology

[0003] At present, if the transmissive head-mounted display used for augmented reality wants to expand the field of view, it will inevitably lead to an increase in the volume of the optical display device, and the existing head-mounted display usually uses an off-axis aspheric surface to form a catadioptric system, although It achieves viewing with a large field of view, but this kind of system generally produces large vertical axis aberration, field curvature and distortion, which deforms the virtual picture and affects the user experience

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