«We are combining the great economic advantages of TES with the potential for low cost and high performance derived from TPV cells fabricated on reusable substrates, with high reflectivity back reflectors for photon recycling,» he said. (sciencedaily.com)
Also, if Carta isn't scalable, which had the main advantage of higher reflectivity for use with the front - light, you might be able to use other e-ink screens instead, like Mobius and still have a good, even light spill, enabling larger screens while still keeping the benefits of higher density, etc.. (blog.the-ebook-reader.com)
But owing to a combination of factors, including the inherent higher reflectivity of the sapphire cover, it's all but impossible to use in direct sunlight. (androidcentral.com)