Abstract
Recent achievements in the photoalignment technique for fabrication of optically rewritable electronic paper with high performance characteristics are surveyed with emphasis on temporal constraints on the exposure process. The possibility of creating electrode-free electronic paper has very important practical aspects. However, many existing studies do not include sufficient analysis on how to achieve acceptable reflective characteristics within short exposure time. In order to achieve this goal, we have applied the rotational diffusion model. We find that the parameters of the diffusion model can be adjusted to get acceptable light-reflecting characteristics within 10 s of exposure. In comparison with the long-time exposure, the reflectance coefficient reduces by 24%. The route to material improvements for optimized e-paper device is discussed.
Highlights
Adaptive optical elements with changing refractive state are of great interest in many industrial and scientific applications [1,2]
The optically rewritable technique is highly desirable because other technologies suffer from the high level complexity of driving circuits to keep grayscale [1,3]
In this review we aim to show both experimental and theoretical advances in optically rewritable (ORW)
Summary
Adaptive optical elements with changing refractive state are of great interest in many industrial and scientific applications [1,2]. The idea behind photoaligned optically rewritable (ORW) technology is to write, store and rewrite computer information, on glass or flexible carrier. Displays which use this principle are called optically rewritable electronic paper (e-paper) displays. A possible solution of this problem can be consideration of the rotational diffusion theory [9] with the subsequent simulation of the contrast ratio and reflectance spectra of the device Analysis of both image writer operating modes with the limited exposure time and light reflecting characteristics of ORW e-paper are important to optimize the composite structure of e-paper. A brief review of e-paper geometry and properties of photoaligned materials.
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