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Dynamic beam shaping for LED lighting

Vladimir Presniakov, Armen Zohrabyan, Oleksandr Sova, Seydou Bassene, Mihai Cotovanu, Aram Bagramyan, Behzad Khodadad, Tom Killick, and Tigran Galstian

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Abstract

We describe an electrically tunable liquid crystal microlens array with a 65 mm clear aperture that allows the dynamic symmetric broadening of white light without mechanical movements. The fundamental mechanism of broadening is demonstrated to involve a spatial twist of molecular orientation. Continuous variations of the light divergence angle are obtained in a very large dynamic range (from 8° to 50°). Particular attention is paid to maintain the desired intensity and color temperature distributions over the angle. The developed lens may be used in various broadband illumination applications based on light-emitting diode-pumped phosphor sources.

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Data underlying the results presented in this paper are not publicly available at this time but may be obtained from the authors upon reasonable request.

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