Polymer-stabilized blue phase liquid crystal with a negative Kerr constant

Li, Yan; Chen, Yuan; Yan, Jin; Liu, Yifan; Cui, Jian‐Peng; Wang, Qiong‐Hua; Wu, Shin‐Tson

doi:10.1364/ome.2.001135

Cited by 17 publications

(14 citation statements)

References 29 publications

(34 reference statements)

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“…This is undoubtedly a major breakthrough for the applications of PSBP on thin film transistor (TFT)-LCD. In addition, the PSBP with negative Kerr effect (-0.16 nm/V 2 ) was also reported by this group [14] . Although it is smaller compared with typical positive PSBP, such negative PSBP can be driven with conventional planar electrode and is useful for controlling the viewing angle of LCD as the C-plate.…”

supporting

confidence: 77%

Brief review of recent research on blue phase liquid crystal materials and devices

Zheng¹,

Zhu²,

Sun³

et al. 2013

中国光学快报

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Both polymer stabilization and bent-shaped molecule doping strategies are utilized to widen the blue phase range of liquid crystals. The molecular structures of compositions are optimized for high thermooptical and electro-optical performances. A low temperature applicable blue phase liquid crystal with suppressed hysteresis is achieved. The bistability of one blue phase liquid crystal is investigated. Based on these materials, fast tunable devices such as gratings with polarization insensitivity are designed and fabricated. The materials and device designs demonstrated here are suitable in wide applications requiring fast response time.OCIS codes: 160.3710, 050.1950, 160.4670. doi: 10.3788/COL201311.011601. It is well known that the nematic, smectic, and cholesteric are three typical phases of the conventional liquid crystals (LCs). The blue phase (BP) is also a special LC phase which normally exists in the materials with large twisted power. When such material is cooled down, many colorful platelet textures can be found in a very narrow temperature range (1-2 K) between the isotropy and chiral nematic phases, that is the BP [1] . Many theoretical analysis and experimental phenomenon have revealed that LC alignment in BP is complex and exotic. Not like the single twisted assembling in cholesteric phase, LC molecules are double twisted assembled in BP. The two twisted axes are crossed with each other and form the double twisted cylinders (DTCs). These DTCs can either exist in disordered distribution, exhibiting a fog-like texture (BP III), or self-assemble into three-dimensional (3D) crystals, showing colorful platelet textures (BP I and BP II) due to the selective Bragg reflections [2,3] . The unique structure of BP LC endows it with some interesting characteristics, such as optical isotropy at voltage off state, fast response time down to submillisecond, which are much benefit for the next generation of display and photonic devices [4−10] . Although BP LC was found a century ago, it was failed to be applied realistically for quite a long time due to its instinct problems, especially its narrow temperature range. Many efforts have been made to overcome this shortage. Some great improvements have been achieved during the last decade. The first promising wide temperature range BP was demonstrated by Kikuchi et al. [11] . They uniformly mixed acrylate based monomers into chiral nematic LCs, and then exposed the mixture under UV at BP state to polymerize the monomers. Finally, the BP was stabilized by polymer network, and the BP range was extended to over 60 • C. This is the so called polymer stabilized BP (PSBP). The mechanism of PSBP is that the polymer forms a stable 3D framework and stabilizes the defects in the frustration BP system. After this strategy was established, especially after Samsung exhibited the first BP LC display (LCD) at SID Display Week in Los Angeles, in 2008, more and more attentions had been attracted by the promising materials. Wu's group [12] has made great contributions to the impro...

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supporting

confidence: 77%

Brief review of recent research on blue phase liquid crystal materials and devices

Zheng¹,

Zhu²,

Sun³

et al. 2013

中国光学快报

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“…Therefore, increasing this threshold value V t beyond the maximum voltage V m is a reasonable strategy to reduce Δ V . Successes in reducing Δ V were also reported for particular compositions—including nanoparticle composites—appropriate choice of the curing temperature, or preparation of large BP monodomains …”

Section: Kerr Effect In Polymer‐stabilized Blue Phases: Recent Develomentioning

confidence: 96%

“…However, VFS combines the advantages of both providing a uniform field and enhancing the optical path length. For analytical purposes, the electro‐optic contrast of field‐induced birefringence in VFS cells can be enhanced by embedding the LC cell in an immersion fluid . Concepts for practical VFS applications assume either oblique observation of the planar cell (and eventually even viewing angle switching) or fabricating cells with corrugated electrodes, where the field direction is tilted with respect to the substrate normal (Fig.…”

Section: Kerr Effect In Polymer‐stabilized Blue Phases: Recent Develomentioning

confidence: 99%

Polymer‐stabilized blue phases: promising mesophases for a new generation of liquid crystal displays

Nordendorf

Hoischen

Schmidtke

et al. 2014

Polymers for Advanced Techs

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Blue phases—special chiral liquid crystalline mesophases—are promising candidates for electro‐optic devices with improved performance and simplified fabrication. A necessary precondition for possible applications is a significantly enhanced temperature range of their existence, which can be achieved by a cross‐linked polymer network formed by in situ polymerization. Unlike many other mesophases, blue phases are optically isotropic if no voltage is applied. Regarding the transmission of a blue phase cell placed between crossed polarizers, the optical isotropy enables—at least in principle—a perfect dark state, independent of the viewing angle, without the necessity of any alignment layer. The application of an in‐plane electric field induces a strong birefringence (Kerr effect). The effective Kerr constants are much larger than those of isotropic liquids, and the switching times between the dark and the induced bright state are in the submillisecond range. Some basic properties of blue phases, state‐of‐the‐art performance, and remaining challenges of the development of polymer‐stabilized blue phases are reviewed in this article. Copyright © 2014 John Wiley & Sons, Ltd.

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“…However, some exceptions exist; for example, without any alignment layer polymer-stabilized blue phase with a negative Δε LC host has been demonstrated recently to possess a negative Kerr constant and submillisecond response time [12]. A negative Δε LC can be used in homogeneous alignment or vertical alignment (VA), depending on the electric field direction.…”

Section: Introductionmentioning

confidence: 99%

High Performance Negative Dielectric Anisotropy Liquid Crystals for Display Applications

Chen

Peng

Yamaguchi³

et al. 2013

Crystals

Self Cite

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Abstract:We review recent progress in the development of high birefringence (Δn ≥ 0.12) negative dielectric anisotropy (Δε < 0) liquid crystals (LCs) for direct-view and projection displays. For mobile displays, our UCF-N2 (low viscosity, negative Δε, high Δn) based homogeneous alignment fringe-field switching (called n-FFS) mode exhibits superior performance to p-FFS in transmittance, single gamma curve, cell gap insensitivity, and negligible flexoelectric effect. For projection displays using a vertical alignment liquid-crystal-on-silicon (VA LCOS), our high birefringence UCF-N3 mixture enables a submillisecond gray-to-gray response time, which is essential for color sequential displays without noticeable color breakup. Our low viscosity UCF-N2 also enables multi-domain VA displays to use a thinner cell gap for achieving faster response time.

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Polymer-stabilized blue phase liquid crystal with a negative Kerr constant

Cited by 17 publications

References 29 publications

Brief review of recent research on blue phase liquid crystal materials and devices

Brief review of recent research on blue phase liquid crystal materials and devices

Polymer‐stabilized blue phases: promising mesophases for a new generation of liquid crystal displays

High Performance Negative Dielectric Anisotropy Liquid Crystals for Display Applications

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