Multicolor Polymer Disperse Microencapsulated Liquid Crystal Displays

Chen, Kuo Feng; Wang, Fang-Hsing; Chan, L.; Hsu, Shih Chieh; Chien, Yu Han; Liu, Shih Hsien; Cheng, Kung Lung

doi:10.1109/jdt.2009.2013485

Cited by 12 publications

(5 citation statements)

References 8 publications

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“…Microcapsules (4-10 mm) (Fig. 2) (Chen et al 2009) filled with an LC and a dichroic dye have been used to produce a paste applied as a varnish on a prepatterned indium tin oxide (ITO) coated polyethylene terephthalate (PET) substrate.…”

Section: Pdlc Preparation Techniquesmentioning

confidence: 99%

See 1 more Smart Citation

Liquid Crystal Polymer Composite Materials for LCDs

Bloisi¹,

Vicari²,

Nasti³

2014

Handbook of Visual Display Technology

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Digital displays nowadays play an essential and ubiquitous role in everyday life, and, in several applications, flexibility (i.e., the possibility to bend the device) or, at least, bending capability (i.e., the possibility to manufacture devices on a curved surface) is desirable or required. Polymer-dispersed liquid crystals (PDLCs) and other liquid crystal/polymer compounds are an interesting class of composite materials for the realization of flexible displays, since they couple the electrooptical properties of liquid crystals to the mechanical properties of polymers and can take full advantage from electronic properties of conducting copolymers. In this chapter, we will briefly discuss preparation techniques and then illustrate the working principle corresponding to different liquid crystal configurations (nematic, chiral, smectic, ferroelectric, holographic) with some examples

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Section: Pdlc Preparation Techniquesmentioning

confidence: 99%

“…An example of a display obtained using PDLC-LV is shown in Fig. 9 (Huitema et al 2001), and others can be found in literature (Chen et al 2009) or on the Web (www. santechdisplay.com/en/product/show.asp?id = 17).…”

Section: Applicationsmentioning

confidence: 99%

Liquid Crystal Polymer Composite Materials for LCDs

Bloisi¹,

Vicari²,

Nasti³

2014

Handbook of Visual Display Technology

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“…It is also difficult to apply on the flexible wearable display field due to its membrane structure. To overcome these drawbacks, use of an independent microcapsule material with a DDLC core has been proposed as one of the most effective methods. ,,− A DDLC-encapsulated polymer shell would not only form a three-dimensional independent structure but also protect the DDLC from the external environment and thus expands its application domain and prolongs the service life. Thus far, the microencapsulation technology has shown immense progress by employing various methods, such as microfluidic droplet generation, membrane emulsification, and layer-by-layer self-assembly methods. − However, although these intelligent materials enhance the environmental stability and increase the application efficiency to some extent, they have a limited solar radiation modulation range that is restricted in the visible-light region and lead to a high level of transmittance in the high-frequency electromagnetic wave and near-infrared radiation (NIR) region.…”

Section: Introductionmentioning

confidence: 99%

Bioinspired Electro-Responsive Multispectral Controllable Dye-Doped Liquid Crystal Yolk–Shell Microcapsules for Advanced Textiles

Sheng

Zhang

Jiang

et al. 2021

ACS Appl. Mater. Interfaces

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Liquid crystal microcapsules have attracted increasing attention due to their sophisticated structures and adjustable multifunctional features. However, the synthesis of a microscale substrate with wide electromagnetic waveband modulation characteristics and good photoelectric stabilization is still limited and challenging. Herein, a new breed of microcapsules containing dye-doped liquid crystals in a yolk−shell configuration with VTES (vinyl-trim-ethyl-silane)-modified Fe 3 O 4 @SiO 2 is created. It exhibits an unexpected color enhancement effect, reversible electrochromic performance, and excellent magnetically controllable characteristics. Additionally, a multispectral (visible light, near-infrared light, and high-frequency electromagnetic wave) electro-responsive fabric based on the proposed microcapsules was developed to explore its application in wearable sensors. The present work opens an avenue toward the fabrication of microscale microencapsulated soft materials with a continuous and stable yolk−shell structure. Moreover, it will expand the application regimes of liquid crystal materials in smart windows and advanced textiles.

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“…Previous study concerning fabricating CNLC microcapsules with a shell–core structure is mainly conducted by solute codiffusion method, emulsification polymerization, or phase separation method; − however, there are several disadvantages when applying the above methods: first, the encapsulation efficiency of CNLCs in bulk polymer is not large enough and is difficult to be improved due to the random phase separation of a polymer matrix from continuous liquid phase into separated solid shell; second, the heterogeneous mixture consisting of CNLCs and polymerizable precursors hardly can be evolved into shell–core structured microcapsules with uniform size in the process of phase separation or emulsification polymerization; last, the direct contact between CNLCs and polymerizable precursors leads to the physical extrusion and chemical adhesion of neighboring microcapsule shells, making the shell morphology exhibit an irregular sphere or ellipsoid.…”

Section: Introductionmentioning

confidence: 99%

Chiral Photonic Crystalline Microcapsules with Strict Monodispersity, Ultrahigh Thermal Stability, and Reversible Response

Lin

Yan

Zhan

et al. 2018

ACS Appl. Mater. Interfaces

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Tunable photonic crystals (TPCs) reflecting selected wavelengths of visible light and responding to external stimuli are widely applied to fabricate smart optical devices. Chiral nematic liquid crystals (CNLCs) possessing response to temperature, electric field, and magnetic field are considered as one-dimensional TPCs. The encapsulation of CNLCs provides responsive photonic devices with stand-alone macroscopic structure and excellent processability. However, when CNLCs as cores are wrapped by polymeric shells to form core-shell structured microcapsules, the polydispersity of microcapsule size, the irregular spatial geometry, and the low thermal stability inevitably result in a deterioration of the optical performance and limited application at high temperatures. Herein, a combination of microfluidic emulsification and interfacial polymerization is employed to fabricate polymer wrapped photonic crystalline microcapsules (PWPCMs). The sizes and reflected colors of PWPCMs can be simultaneously controlled by adjusting the flow rates in the microfluidic chips. PWPCMs possess strictly monodispersed sizes with coefficients of variation less than 1%. The free-standing PWPCMs have high thermal stability. The deformation temperature of PWPCMs is as high as 210 °C. The colored PWPCMs also exhibit a reversible thermochromic property between the chiral nematic phase and the isotropic phase. The highly stable and tunable PWPCMs provide new opportunities for a wide range of photonic applications, including smart optical window, tunable microlasers, responsive microsensors, and various photonic devices.

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Multicolor Polymer Disperse Microencapsulated Liquid Crystal Displays

Cited by 12 publications

References 8 publications

Liquid Crystal Polymer Composite Materials for LCDs

Liquid Crystal Polymer Composite Materials for LCDs

Bioinspired Electro-Responsive Multispectral Controllable Dye-Doped Liquid Crystal Yolk–Shell Microcapsules for Advanced Textiles

Chiral Photonic Crystalline Microcapsules with Strict Monodispersity, Ultrahigh Thermal Stability, and Reversible Response

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