31.4: Properties of Nano‐Phase‐Separated Liquid Crystals (NPS LCs) with Fast Response

Fujisawa, Toru; Keumhee, Jang; Kodera, Fumiaki; Gushiken, Marina; Sudou, Gou; Hasebe, Hiroshi; Takatsu, Haruyoshi

doi:10.1002/sdtp.10421

Cited by 6 publications

(4 citation statements)

References 1 publication

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“…In addition, different chemical structure of RM has different anchoring force on the oriented layer. Therefore, the RM that can provide strong anchoring, the same degree of pre-tilt angle can be obtained with a smaller addition [7,8] . The polymerization reaction of RM that plays a key role is generally divided into two steps for UV1 and UV2 process.…”

Section: Introductionmentioning

confidence: 99%

P‐12.13: Novel Phase Separation Reactive Mesogen for Speeding Polymer‐stabilized Vertical Alignment Process

Zhan¹,

Liu²,

Li³

et al. 2023

Symp Digest of Tech Papers

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Well known the polymer‐stabilized vertically aligned (PS‐VA) liquid crystal display (LCD) has been extensively using for TV application. However, for the purpose of energy saving during the UV exposure process, there is still no available reactive mesogen solution at PS‐VA mode. In this paper, through the Gaussian program calculation, we have investigated the novel reactive mesogen with high reactivity at the wavelength of 313 nm compared to the current commercial reactive mesogen. By using this novel reactive mesogen at PS‐VA process, there is a positive performance to shorten 74% both UV1 and UV2 curing time. The polymer bump size of novel reactive mesogen is quite smaller after UV curing process. After UV curing process by using both novel reactive mesogen and current commercial reactive mesogen under the same host mixture separately, the optical and reliability performance are also comparable in between.

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Section: Introductionmentioning

confidence: 99%

P‐12.13: Novel Phase Separation Reactive Mesogen for Speeding Polymer‐stabilized Vertical Alignment Process

Zhan¹,

Liu²,

Li³

et al. 2023

Symp Digest of Tech Papers

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“…The direction of the strain is also closely related to the pretilt angle [6]. The pretilt angles were also controlled by using a method in which the monomers are polymerized by UV irradiation under an applied voltage (such as polymer sustained alignment [7][8][9] or nanophase-separated [10,11]), regulating the baking temperature [12][13][14], adjusting the rubbing strength [14,15], using a mixture of vertical and horizontal alignment materials [16,17], or stacking a vertical (horizontal) alignment material on a horizontal (vertical) alignment material [15,18,19].…”

Section: Introductionmentioning

confidence: 99%

Angular Dependence of Guest–Host Liquid Crystal Devices with High Pretilt Angle Using Mixture of Vertical and Horizontal Alignment Materials

et al. 2023

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To date, devices exhibiting incidence-angle-dependent transmittance have been fabricated by imparting an angle to a bulk liquid crystal (LC) by aligning the LC in the vicinity of one substrate horizontally (with respect to the substrate) while aligning the LC in the vicinity of another substrate vertically. Another approach has been to control LC angles near substrates by blending or layering horizontal and vertical alignment films. In this study, we control LC angles near substrates by controlling the pretilt angles of blended alignment films; for specific angles, we use dichroic dyes to characterize the incidence angle dependence of these LC devices. Using a guest/host LC device with a pretilt angle near 45°, we successfully construct an LC element with a transmittance peak near a polar angle of 45°.

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“…The usage of UV-curable RMs and nonpolarized UV light irradiation with/without a voltage for stabilizing the LC molecular arrangement has been explored. A polymer matrix is formed in the vicinity of the PI alignment layer or inside the LC layer to stabilize the LC structure [7][8][9][10] or decrease the response time (as in polymer sustained alignment LCs 11) and nano-phase separated LCs 12,13) ). For example, a PI alignment layer mixed with UV-curable RMs yielded a surfacecontrolled vertical alignment mode with the first response time.…”

Section: Introductionmentioning

confidence: 99%

Electro-optical property of polymerized liquid crystal devices using linearly polarized UV irradiation

Ito¹,

Kajiwara²,

Takatoh³

2022

Jpn. J. Appl. Phys.

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Display characteristics have a fairly strong dependence on the configuration of the liquid crystal (LC) molecules and interactions between the LC molecules and the alignment layer surface. To obtain LC devices with a fast response, the usage of reactive mesogens (RMs) have been studied. RMs polymerize in the vicinity of the alignment layer. We assessed the effectiveness of linearly polarized UV light for polymer formation. Three kinds of UV light, namely (i)non-polarized (ii)parallel to, and (iii)perpendicular to the rubbing direction, were used to irradiate LC cells with RM concentrations of 5wt% and 10wt%. For both RM concentrations, LC devices using LPUV parallel to the rubbing direction yielded the shortest decay times. SEM observation revealed that the fibrils polymerized linearly in the same direction on using LPUV parallel to the rubbing direction. The decay time was presumably shortened by the strong anchoring force and high alignment ability of the linear fibrils.

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31.4: Properties of Nano‐Phase‐Separated Liquid Crystals (NPS LCs) with Fast Response

Abstract: Abstract

Cited by 6 publications

References 1 publication

P‐12.13: Novel Phase Separation Reactive Mesogen for Speeding Polymer‐stabilized Vertical Alignment Process

P‐12.13: Novel Phase Separation Reactive Mesogen for Speeding Polymer‐stabilized Vertical Alignment Process

Angular Dependence of Guest–Host Liquid Crystal Devices with High Pretilt Angle Using Mixture of Vertical and Horizontal Alignment Materials

Electro-optical property of polymerized liquid crystal devices using linearly polarized UV irradiation

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