OPTICAL HEAD-MOUNTED DISPLAY WITH MECHANICAL ONE-DIMENSIONAL SCANNER

摘要

An optical head-mounted display includes an eyeglass frame, a holographic optical element supported by the eyeglass frame to be confronted by an eye of a wearer, and a projector mounted on the eyeglass frame to project image information on the holographic optical element. The projector includes a LED light source, a beam-splitting polarizer, a spatial light modulator, a lens set and a mechanical one-dimensional scanner. The mechanical one-dimensional scanner reflects the transformed light beam from the lens set onto the holographic optical element in one dimension at a time. When the reflective sheet is rotated at a range of angle in a brief moment of time, the holographic optical element receives from the rotating reflective sheet an array of one-dimensional modulated light beams and reflects the latter to form a two-dimensional image in the eye because of persistence of vision.

主权项

1. An optical head-mounted display comprising an eyeglass frame, a holographic optical element (HOE) supported by the eyeglass frame to be confronted by an eye of a wearer, and a projector mounted on the eyeglass frame to project image information on the holographic optical element, wherein the projector includes:
a LED light source; a beam-splitting polarizer configured to split an incident beam from the LED light source into two light beams of differing linear polarization; a spatial light modulator for modulating an associated one of the two light beams from the beam-splitting polarizer; a lens set for transforming the modulated light beam from the spatial light modulator; a mechanical one-dimensional scanner comprising a pivotable reflective sheet for reflecting the transformed light beam from the lens set onto the holographic optical element in one dimension at a time, and a controller for controlling rotation of the reflective sheet about an axis step by step; and the holographic optical element having properties of wavelength selectivity and angle selectivity and allowing light to pass through; wherein when the reflective sheet is rotated about the axis at a range of angle in a brief moment of time, the holographic optical element gradually receives from the rotating reflective sheet an array of one-dimensional transformed light beams and reflects the latter to form a two-dimensional image in the eye of the wearer because of persistence of vision.