Liquid-crystal-based polarization volume grating applied for full-color waveguide displays

In this Letter, we demonstrate polarization volume grating (PVG)-based couplers for a double-layer waveguide display to realize a full-color near-eye display. The polarized interference exposure with photo-alignment methods was employed to generate a birefringent spiral configuration with two-dimens...

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Veröffentlicht in:Optics letters 2018-12, Vol.43 (23), p.5773-5776
Hauptverfasser: Weng, Yishi, Zhang, Yuning, Cui, Jingyi, Liu, Ao, Shen, Zhongwen, Li, Xiaohua, Wang, Baoping
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Sprache:eng
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Zusammenfassung:In this Letter, we demonstrate polarization volume grating (PVG)-based couplers for a double-layer waveguide display to realize a full-color near-eye display. The polarized interference exposure with photo-alignment methods was employed to generate a birefringent spiral configuration with two-dimensional periodicity in a chiral-dopant reactive mesogen material. Such a structure presents a unique highly efficient single-order Bragg diffraction with polarized selectivity. The prepared PVG couplers exhibited over 80% diffraction efficiency with large diffraction angles at spectra of blue (457 nm), green (532 nm), and red (630 nm). The demonstrated waveguide prototype showed a full-color display with a diagonal field of view of around 35°. The overall optical efficiency was measured as high as 118.3  cd/m per lumen with a transparency of 72% for ambient light.
ISSN:0146-9592
1539-4794
DOI:10.1364/ol.43.005773