[Paper] Evaluation of Capability to Maintain Thickness of LC layer of Flexible LCDs with Bonding Polymer Spacers

Ishinabe, Takahiro; Takahashi, Shogo; Shibata, Yosei; Fujikake, Hideo

doi:10.3169/mta.7.183

Cited by 4 publications

(3 citation statements)

References 12 publications

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“…Here, it has been reported that localized bending and stretching during LCD deformation causes display defects due to liquid crystal flow [4]. We formed the lattice-shaped polymer wall using photopolymerizable monomer as post spacer in the LCD cell.…”

Section: Introductionmentioning

confidence: 99%

29‐3: Invited Paper: Ultra‐thin Stretchable LCD Using Deformable Polarizer

Kawamura

Umemoto

Takae

et al. 2022

Symp Digest of Tech Papers

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Section: Introductionmentioning

confidence: 99%

29‐3: Invited Paper: Ultra‐thin Stretchable LCD Using Deformable Polarizer

Kawamura

Umemoto

Takae

et al. 2022

Symp Digest of Tech Papers

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“…We previously reported that polymer spacers formed in LCs via ultraviolet (UV) light patterning suppressed substrate deformation during curvature by bonding the top and bottom substrates [20][21][22]. This bonding technique can be used to develop flexible PNLCs [23,24].…”

Section: Introductionmentioning

confidence: 99%

Flexible polymer network liquid crystals using imprinted spacers bonded by UV-curable reactive mesogen for smart window applications

Ishinabe

Isa

Shibata

et al. 2021

Journal of Information Display

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We propose junction-type, vertically aligned polymer network liquid crystals using plastic substrates for flexible smart windows, in which the spacers are formed with the imprinting method and are bonded to the substrate surface by UV-curable reactive mesogen (RM). We clarified that the optical property can be improved by suppressing the aggregation of RMs around the spacers through thinning of the coating of the RM and the simultaneous improvement of the wettability of the parallel alignment film. We achieved excellent haze properties of 3.0% with voltage off and 92.7% with voltage on, and high curvature performance with a small curvature radius of 9.0 mm.

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“…Portable and flexible liquid crystal displays (LCDs) have attracted a lot of attention because of their superiorities in weight, flexibility, the resistance to breakage, and high display quality, − and recently, significant focus has been poured on developing flexible LCDs by various thin and durable plastic substrates. − After many efforts, several difficult but essential problems have been clearly realized, including the most important one of how to stabilize the alignment of liquid crystals (LCs) in bending. Patterned substrates showing significant advantages in maintaining the alignment of LCs have been regarded as one of the most efficient methods in fabricating flexible LCDs .…”

Section: Introductionmentioning

confidence: 99%

Vanadium Dioxide Nanoparticle Doped Polyimide Hybrid Alignment Layers for Flexible Liquid Crystal Displays

Liu

Yang

Shi

et al. 2021

ACS Appl. Electron. Mater.

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In this paper, a flexible liquid crystal display (LCD) is developed by applying hybrid alignment layers made of vanadium dioxide (VO 2 ) nanoparticles and homeotropic-polyimide (h-PI) onto colorless plastic substrates, and the proposed hybrid thin layers with randomly embedded agglomerated VO 2 nanoparticles exhibit a transparency over 85% at 550 nm including the substrate and a strong surface irregularity. After rubbing, liquid crystals (LCs) are vertically aligned between the hybrid thin layers with a tilt angle of ∼90°, and due to the significant surface plasmon polariton (SPP) of VO 2 nanoparticles, the switch of LCs under the external electrical field has been remarkably accelerated. The operating voltage to switch LCs in a 5 μm cell assembled using a pair of 0.5% VO 2 nanoparticle doped h-PI hybrid alignment layers has been reduced to 3.536 V, and simultaneously, the decaying time is also shortened more than 18%. Notably, the vertical alignment of LCs was also stabilized under bending thanks to the use of undulating hybrid alignment layers. The fabricated flexible LC cell using 0.5% VO 2 nanoparticle doped h-PI alignment layers yielded good flexibility at a bending radius of 1500 mm without aggravated light leakages and deduced electro-optical performance, and the VO 2 agglomerates hindering the slide of LCs by providing adequate obstructions are believed as the main contributors in firmly stabilizing the vertical alignment of LCs during bending. Compared to micropatterned substrates, ultrathin VO 2 nanoparticle doped h-PI alignment layers employed in flexible LC cells demonstrating their priorities in easy investigation and displaying quality improvement are emerging, highly appreciated, and of great interest for the potential applications in flexible LCDs.

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[Paper] Evaluation of Capability to Maintain Thickness of LC layer of Flexible LCDs with Bonding Polymer Spacers

Cited by 4 publications

References 12 publications

29‐3: Invited Paper: Ultra‐thin Stretchable LCD Using Deformable Polarizer

29‐3: Invited Paper: Ultra‐thin Stretchable LCD Using Deformable Polarizer

Flexible polymer network liquid crystals using imprinted spacers bonded by UV-curable reactive mesogen for smart window applications

Vanadium Dioxide Nanoparticle Doped Polyimide Hybrid Alignment Layers for Flexible Liquid Crystal Displays

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