Walls and curtains could sport liquid-crystal digital displays.
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References
Penterman, R. et al. Single-substrate liquid-crystal displays by photo-enforced stratification. Nature 417, 55 - 58 (2002).
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University of Oxford, UK
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Single-substrate liquid-crystal displays by photo-enforced stratification. Nature (2002). https://doi.org/10.1038/news020429-7
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DOI: https://doi.org/10.1038/news020429-7
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