Compactness and light weight, large exit pupil diameter and distance, small distortion for virtual image, and see-through light paths are pivotal factors to achieve a better, wearable experience of optical see-through head-mounted displays (OST-HMDs). In addition, light efficiency of the virtual image light path is an important factor for heat dissipation in HMD devices. This paper presents a new type of OST-HMD optical system that includes three wedge-shaped freeform prisms and two symmetric lenses. Based on a 0.71 in. microdisplay, an OST-HMD prototype with a diagonal field of view (FOV) of 45.3°, an F -number ( F /#) of 1.8, an exit pupil size of 12 mm × 8 mm , and an eye relief of 18 mm is demonstrated. The maximum value of distortion of the final system is 0.6% and 0.4% for virtual image and see-through light path, respectively. The overall dimension of the optical system per eye is no larger than 30 mm ( width ) × 40 mm ( height ) × 14 mm (thickness), and the weight of the optical module including lenses, holder, and microdisplay is 12.8 g. The light efficiency of the virtual image light path is up to 50% higher than those of other OST-HMD optical solutions.

#	Concept	H-Index	Publications	Citations
1	Engineering	1	1	76
2	Medicine	1	1	76
3	Optical Sciences	1	1	76
4	Classical Optics	1	1	76
5	Fiber Optics	1	1	76

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