Performance characterization of a single bi-axial scanning MEMS mirror-based head-worn display

Minhua Liang

doi:10.1117/12.469188

4 June 2002 Performance characterization of a single bi-axial scanning MEMS mirror-based head-worn display

Minhua Liang

Proceedings Volume 4773, Optical Scanning 2002; (2002) https://doi.org/10.1117/12.469188
Event: International Symposium on Optical Science and Technology, 2002, Seattle, WA, United States

Abstract

The Nomad^TM Personal Display System is a head-worn display (HWD) with a see-through, high-resolution, high-luminance display capability. It is based on a single bi-axial scanning MEMS mirror. In the Nomad HWD system, a red laser diode emits a beam of light that is scanned bi-axially by a single MEMS mirror. A diffractive beam diffuser and an ocular expand the beam to form a 12mm exit pupil for comfortable viewing. The Nomad display has an SVGA (800x600) resolution, 60Hz frame rate, 23-degree horizontal field of view (FOV) and 3:4 vertical to horizontal aspect ratio, a luminance of 800~900 foot-Lamberts, see-through capability, 30mm eye-relief distance, and 1-foot to infinity focusing adjustment. We have characterized the performance parameters, such as field of view, distortion, contrast ratio (4x4 black and white checker board), modulation depth, exit pupil size, eye relief distance, maximum luminance, dynamic range ratio (full-on-to-full-off ratio), dimming ratio, and luminance uniformity at image plane. The Class-1 eye-safety requirements per IEC 60825-1 Amendment 2 (CDRH Laser Notice No. 50) are analyzed and verified by experiments. The paper describes all of the testing methods and set-ups as well as the representative test results. The test results demonstrate that the Nomad display is an eye-safe display product with good image quality and good user ergonomics.

Citation Download Citation

Minhua Liang "Performance characterization of a single bi-axial scanning MEMS mirror-based head-worn display", Proc. SPIE 4773, Optical Scanning 2002, (4 June 2002); https://doi.org/10.1117/12.469188

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