63-1: High Transmittance and Fast Response Time Liquid Crystal Displays Using A Novel Electrode Pattern

Ling, Ankai; Chen, Jian-Qun; Wu, Lei; Xie, Huimin; Shen, Poping; Tseng, Chang‐Ho

doi:10.1002/sdtp.10814

Cited by 4 publications

(3 citation statements)

References 4 publications

(1 reference statement)

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“…Recently, many studies have been performed in research and development for virtual reality and augmented reality. Fast response has been obtained by the control of the fringe field direction by means of a combination of VA and a lateral electric field, a device of FFS electrode shape, and a specially‐designed aperture in an electrode, such as a slit or a hole 5Mixing of a third substance with LCs: The latest papers are shown in Table .…”

Section: Lc Configurations and Their Display Characteristicsmentioning

confidence: 99%

Alignment control technology of liquid crystal molecules

Ishihara

Mizusaki

2019

J Soc Info Display

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Liquid crystal displays are now indispensable in everyday life. The display characteristics considerably depend on the configuration of liquid crystal (LC) molecules and interactions between the LC molecules and an alignment film surface. In this paper, we introduce various methods to control parameters that dominate the LC alignment. These parameters include order parameters, the pretilt angle, the director direction, and surface anchoring strength. We also introduce their evaluation methods. In particular, recent alignment film‐free technology is explained in detail. In addition, details of how these parameters are related to the display characteristics, particularly wide viewing angles and fast response characteristics, are described primarily with reference to recent technologies.

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Section: Lc Configurations and Their Display Characteristicsmentioning

confidence: 99%

Alignment control technology of liquid crystal molecules

Ishihara

Mizusaki

2019

J Soc Info Display

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“…The decay time of each cell was measured to determine the response speed, as shown in Figure 4 c. The gray-to-gray method, which is most commonly used, was used to measure the response speed. Here, the gray range was designated as dark gray and light gray for a transmittance of 10 and 90%, respectively [ 32 , 33 , 34 ]. Therefore, the decay time is the time taken to drop from 90 to 10% of the transmittance.…”

Section: Resultsmentioning

confidence: 99%

Fabrication of TiO2-Embedded Polyimide Layer with High Transmittance and Improved Reliability for Liquid Crystal Displays

Son

Choi

et al. 2021

Polymers

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Construction of liquid crystal (LC) alignment by introducing polyimide (PI) to indium tin oxide (ITO) electrodes is one of the main methods to realize high-resolution images in liquid crystal displays (LCD). However, the loss of transmittance caused by the difference in refractive index between ITO and PI leads to direct degradation of LCD performance. Thus, we herein fabricated a functional hybrid PI alignment layer that reduces the difference in refractive index and greatly increases the transmittance of the device by introducing inorganic titanium dioxide (TiO2) nanoparticles (NP) to the organic PI. The highly refractive TiO2 NPs were surface-treated with stearic acid comprising long alkyl chains to improve their dispersibility and uniformly dispersed in the PI matrix by simply stirring the mixture. The hybrid PI mixture was spin-coated on the ITO substrate, and the resulting LC cell exhibited excellent electro-optical properties. In addition, the reliability of the LC cells was enhanced by the inclusion of the TiO2 NPs, which was confirmed through the evaluation of voltage holding ratio, residual direct current, and LC cell reliability. Overall, functional hybrid PI can be used in advanced display technology for next-generation LC devices that require high transmittance and reliability.

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“…The measurement of response speed was based on gray-to-gray method, which is currently the most commonly used measure of response time. This method measures, in terms of time, the display transitions from dark gray to light gray (rising time) or from light gray to dark gray (decay time), whereby 10% transmittance was set to dark gray and 90% to light gray [34][35][36]. It can be seen in Figure 6 that the rising time of the conventional PI/ITO substrate is 22 ms and the decay time is 15 ms.…”

Section: Resultsmentioning

confidence: 99%

Vertical Alignment of Nematic Liquid Crystals Based on Spontaneous Alignment Layer Formation between Silver Nanowire Networks and Nonionic Amphiphiles

Son

Lee

2020

Crystals

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The vertical arrangement of nematic liquid crystals (LCs) in displays can be generally achieved by introducing a polyimide material onto indium tin oxide electrodes. However, this method requires multiple coating and deposition processes as well as high curing temperature, restricting the potential applicability to flexible displays. Thus, we herein propose the facile approach for homeotropic alignment of nematic LCs based on spontaneous alignment layer formation between silver nanowire networks and nonionic amphiphiles. The silver nanowires as transparent electrode materials were spin-coated on glass substrate and 4-(4-heptylphenyl)benzoic acids as nonionic amphiphiles were doped into the LC medium. The nonionic amphiphiles were spontaneously bonded to the polyvinylpyrrolidone capping layer of silver nanowire networks through polar interactions, creating the self-assembled alignment layer of nonionic amphiphiles on silver nanowire electrodes. In addition, the alkyl chains of the amphiphiles interacted with the LC molecules, leading to stable directional LC alignment along vertical direction. The electro-optical characteristics of the manufactured LC cell were comparable to those of conventional device including polyimide layer and indium tin oxide electrode. Overall, the combination of silver nanowire electrode and nonionic amphiphiles presents a new way to achieve the vertical alignment of nematic LCs without polyimide layer.

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63-1: High Transmittance and Fast Response Time Liquid Crystal Displays Using A Novel Electrode Pattern

Cited by 4 publications

References 4 publications

Alignment control technology of liquid crystal molecules

Alignment control technology of liquid crystal molecules

Fabrication of TiO2-Embedded Polyimide Layer with High Transmittance and Improved Reliability for Liquid Crystal Displays

Vertical Alignment of Nematic Liquid Crystals Based on Spontaneous Alignment Layer Formation between Silver Nanowire Networks and Nonionic Amphiphiles

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