The domain mixing effect on the electro-optical properties of liquid crystals using polyimide doped with reactive mesogen

Functional films made of reactive mesogens (RMs) are widely used in display devices such as liquid crystal displays (LCDs) and organic light-emitting diode displays (OLEDs). While functional RM films have been intensively developed for commercial application in the industrial sector, the fundamental studies on it in the academic sector are relatively limited. Here, functional RM films are reviewed in terms of their materials and fabrication processes as well as their applications in display devices. Also briefly reviewed is the recent research on them that may potentially be used in future display devices. This review was intended to provide an overall summary of RM applications in display devices and of the recent trends of the relevant studies to non-experts as well as experts in display applications.

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Generation of intensity-tunable structural color from helical photonic crystals for full color reflective-type display

Kim

Lee

et al. 2018

Opt. Express

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A new concept of intensity-tunable structural coloration is proposed on the basis of a helical photonic crystal (HPC). The HPCs are constructed from a mixture of chiral reactive mesogens by spin-coating, followed by the photo-polymerization. A liquid crystal (LC) layer, being homogeneously aligned, is prepared on the HPCs to serve as a tunable waveplate. The electrical modulation of the phase retardation through the LC layer directly leads to the intensity-tunable Bragg reflection from the HPCs upon the incidence of the polarized light. The bandwidths of the structural colors are found to be well preserved regardless of the applied voltage. A prototype of a full color reflective-type display, incorporated with three primary color units, is demonstrated. Our concept of decoupling two mutually independent functions, the intensity modulation by the tunable waveplate and the color reflection by the HPCs provides a simple and powerful way of producing a full color reflective-type display which possesses high color purity, high optical efficiency, the cycling durability, and the design flexibility.

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The domain mixing effect on the electro-optical properties of liquid crystals using polyimide doped with reactive mesogen

Cited by 3 publications

References 28 publications

Ferroelectric liquid crystal devices on strengthened photoalignment films

Ferroelectric liquid crystal devices on strengthened photoalignment films

Functional films using reactive mesogens for display applications

Generation of intensity-tunable structural color from helical photonic crystals for full color reflective-type display

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