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Optics Express

Optics Express

  • Editor: Andrew M. Weiner
  • Vol. 22, Iss. 17 — Aug. 25, 2014
  • pp: 20705–20719

Design of an ultra-thin near-eye display with geometrical waveguide and freeform optics

Dewen Cheng, Yongtian Wang, Chen Xu, Weitao Song, and Guofan Jin  »View Author Affiliations


Optics Express, Vol. 22, Issue 17, pp. 20705-20719 (2014)
http://dx.doi.org/10.1364/OE.22.020705


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Abstract

Small thickness and light weight are two important requirements for a see-through near-eye display which are achieved in this paper by using two advanced technologies: geometrical waveguide and freeform optics. A major problem associated with the geometrical waveguide is the stray light which can severely degrade the display quality. The causes and solutions to this problem are thoroughly studied. A mathematical model of the waveguide is established and a non-sequential ray tracing algorithm is developed, which enable us to carefully examine the stray light of the planar waveguide and explore a global searching method to find an optimum design with the least amount of stray light. A projection optics using freeform surfaces on a wedge shaped prism is also designed. The near-eye display integrating the projection optics and the waveguide has a field of view of 28°, an exit pupil diameter of 9.6mm and an exit pupil distance of 20mm. In our final design, the proportion of the stray light energy over the image output energy of the waveguide is reduced to 2%, the modulation transfer function values across the entire field of the eyepiece are above 0.5 at 30 line pairs/mm (lps/mm). A proof-of-concept prototype of the proposed geometrical waveguide near-eye display is developed and demonstrated.

© 2014 Optical Society of America

OCIS Codes
(080.2740) Geometric optics : Geometric optical design
(120.2040) Instrumentation, measurement, and metrology : Displays
(220.4610) Optical design and fabrication : Optical fabrication
(350.4600) Other areas of optics : Optical engineering
(330.7321) Vision, color, and visual optics : Vision coupled optical systems

ToC Category:
Geometric Optics

History
Original Manuscript: May 22, 2014
Revised Manuscript: July 24, 2014
Manuscript Accepted: July 29, 2014
Published: August 19, 2014

Citation
Dewen Cheng, Yongtian Wang, Chen Xu, Weitao Song, and Guofan Jin, "Design of an ultra-thin near-eye display with geometrical waveguide and freeform optics," Opt. Express 22, 20705-20719 (2014)
http://www.opticsinfobase.org/oe/abstract.cfm?URI=oe-22-17-20705


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