Cholesteric Reflective Displays

Coates, David

doi:10.1007/978-3-319-14346-0_93

Cited by 3 publications

(2 citation statements)

References 49 publications

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“…This spacer guarantees proper layer alignment and separation, which is crucial for preserving the LC's orientation and operation because, upon exerting shear stress on a cholesteric film, such as through substrate pressing, the system readily transitions back to the slightly more energetically stable planar texture. 72 The bottom ITO layer performs the same function as the top ITO layer, completing the pair of electrodes required to alter the state of the cholesteric LC layer. An absorption layer is often put directly beneath this, typically with black paint.…”

Section: Implementationsmentioning

confidence: 99%

Emulating paper: a review of reflective display technologies

Herle,

Martin,

Villanueva

et al. 2024

J. Optical Microsystems

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Reflective displays, which harness ambient light, offer energy-efficient alternatives to traditional emissive screens in mobile devices. This review provides an overview of various reflective display technologies and their comparative performance metrics. The review highlights the potential of micro-electromechanical system-based displays, with metrics including 90% reflectance, a contrast ratio of 30, a frequency of 120 Hz, and a resolution of about 350 pixels per inch. Their applicability to mainstream devices such as e-readers, smartphones, and smartwatches continues to be a topic of interest and exploration.

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Section: Implementationsmentioning

confidence: 99%

Emulating paper: a review of reflective display technologies

Herle,

Martin,

Villanueva

et al. 2024

J. Optical Microsystems

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“…Additionally, the optical properties of CLCs are tunable with control, which gives rise to a wide range of applications in the field of sensors, temperature, − pressure, − light, , or humidity − sensors; electrically tunable bandpass filters; , polarizer-free reflective displays; − and smart window prototypes. − …”

Section: Introductionmentioning

confidence: 99%

Bioinspired, Cholesteric Liquid-Crystal Reflectors with Time-Controlled Coexisting Chiral and Achiral Structures

Boyon

Soldan²,

Mitov

2021

ACS Appl. Mater. Interfaces

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The twisted structures of the chitin-based cuticle of beetles confer specific optical characteristics on them. Intrigued by the observation of Bragg gratings with a depth-dependent periodicity in the cuticle of Chrysina beetles, we determine the experimental conditions leading to their transcription into cholesteric liquid-crystal oligomers. We correlate the optical properties of reflectors thus produced with their internal morphology, as observed by transmission electron microscopy. With the use of a single parameter, thermal annealing time, the reflection color is made time-tunable. Different spectral bands and reflection colors from golden yellow to NIR are available, and the irreversibility of the final color is reached at the end. On the basis of the design concept and these properties, these hybrid chiral–achiral materials inspire the fabrication of smart reflective labels. When encapsulated in the package of a product to be kept under cold conditions, the label records the history of the product conservation. Two kinds of information based on color changes are recorded as follows: qualitative information reporting that the product was kept outside of the specified storage temperature and quantitative information giving an indication of the time elapsed since the temperature exceeded the storage temperature of the product.

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