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Optics Express

Optics Express

  • Editor: Andrew M. Weiner
  • Vol. 21, Iss. 21 — Oct. 21, 2013
  • pp: 24636–24646

Transmission characteristics of a bidirectional transparent screen based on reflective microlenses

M. Kivanc Hedili, Mark O. Freeman, and Hakan Urey  »View Author Affiliations

Optics Express, Vol. 21, Issue 21, pp. 24636-24646 (2013)

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A microlens array (MLA) based see-through, front projection screen, which can be used in direct projection head-up displays (HUD), color teleprompters and bidirectional interactive smart windows, is evaluated for various performance metrics in transmission mode. The screen structure consists of a partially reflective coated MLA buried between refractive-index-matched layers of epoxy as reported in Ref [1]. The reflected light is expanded by the MLA to create an eyebox for the user. The brightness gain of the screen can be varied by changing the numerical aperture of the microlenses. Thus, using high gain designs, a low-power projector coupled with the screen can produce high-brightness and even 3D images as the polarization is maintained at the screen. The impact of the partially reflective coatings on the transmitted light in terms of resolution and modulation transfer function associated with the screen is studied. A condition similar to the Rayleigh criteria for diffraction-limited imaging is discussed for the microlens arrays and the associated coating layers. The optical path difference between the light transmitted from the center and the edges of each microlens caused by the reflective layer coatings should not exceed λ/4. Furthermore, the crosstalk between the front and rear projected images is found to be less than 1.3%.

© 2013 OSA

OCIS Codes
(220.0220) Optical design and fabrication : Optical design and fabrication
(230.1980) Optical devices : Diffusers
(230.3990) Optical devices : Micro-optical devices
(310.6860) Thin films : Thin films, optical properties

ToC Category:
Optical Design and Fabrication

Original Manuscript: April 17, 2013
Revised Manuscript: June 24, 2013
Manuscript Accepted: August 19, 2013
Published: October 8, 2013

M. Kivanc Hedili, Mark O. Freeman, and Hakan Urey, "Transmission characteristics of a bidirectional transparent screen based on reflective microlenses," Opt. Express 21, 24636-24646 (2013)

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