Abstract
A design for a head-mounted display using holographic optical elements (HOEs) and pancake optics is presented. The pancake optics assembly consists of a circular polarization, quarter-wave film, and a coated 50/50 (semi-transmissive and semi-reflective) aspherical lens. The HOE and pancake optics combination was employed to reduce the volume of the system. For this design, the effective focal length was 10.901 mm, the field of view was 30 deg, and the f-number was 3.633. In terms of image quality, the modulation transfer function (MTF) values for all fields exceeded 0.3 at 65 lp/mm. The MTF values for all fields under the tolerance error also exceeded 0.3 lp/mm. The maximum optical distortion was less than 2%. The impact of the efficiency of diffracted and non-diffracted light on the visibility was analyzed to select the appropriate reflectance for the coating of the 50/50 aspherical lens and the highest hologram diffraction efficiency to achieve the best visibility.
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