Patent ID: 8934160
Filing Date: 2015-01-13
Classification: G02B

Abstract:
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.