P-76: Polarization-Controllable Light-Printer for Optically Rewritable (ORW) Liquid Crystal Displays

Zhang, Wanlong; Tseng, Man Chun; Lee, Chung Yung; Sun, Jiatong; Tang, Shu Tuen; Cheung, Yuk Lung; Srivastava, Abhishek Kumar; Chigrinov, Vladimir G.; Kwok, Hoi Sing

doi:10.1002/sdtp.10956

Cited by 6 publications

(4 citation statements)

References 5 publications

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“…Moreover, we emphasize the pressure-insensitive characteristic which has not been proposed by Wang et al [11]. The concept developed in this study can be potentially applied to optically rewritable displays [23] or displays with memorized grayscale levels [24].…”

Section: Discussionmentioning

confidence: 74%

Photo-switchable chiral liquid crystal with optical tristability enabled by a photoresponsive azo-chiral dopant

Hsiao¹,

Huang²,

Lee

2017

Opt. Express

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A light-driven tristable chiral-tilted homeotropic nematic (TCHN) cell is demonstrated. The liquid-crystal cell is photo-switchable among the three stable states: the tilted-homeotropic, fingerprint, and the tilted-twist states. The inclusion of a photosensitive chiral bis(azobenzene) compound into a typical nematic liquid crystal makes the resulting material possible to switch from one to another stable state directly and reversibly owing to the photoinduced trans-cis isomerization of the azo-chiral dopant and, hence, the configurational change of the liquid crystal via the guest-host effect. By further introducing dichroic dyes into the TCHN system, we devised a polarizer-free display and light modulators. The novel TCHN composite material opens up new possible applications in light-driven optical elements and devices.

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Section: Discussionmentioning

confidence: 74%

Photo-switchable chiral liquid crystal with optical tristability enabled by a photoresponsive azo-chiral dopant

Hsiao¹,

Huang²,

Lee

2017

Opt. Express

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“…The simplest structure for fabrication of ORW e-paper is the twisted nematic LC, which is confined between two flexible substrates. In practice, this gap on flexible film is controlled by micrometer-sized spacers [15]. Figure 3a shows schematic representation of the considered cell, where one substrate is covered by photoactive alignment layer, and another is covered by photopassive (photostable) alignment layer.…”

Section: Geometry Of Orw E-paper and Properties Of Materialsmentioning

confidence: 99%

“…The simplest structure for fabrication of ORW e-paper is the twisted nematic LC, which is confined between two flexible substrates. In practice, this gap on flexible film is controlled by micrometer-sized spacers [15]. Figure 3a Several interesting features are observed if LC is doped with a fluorescent dye [7].…”

Section: Geometry Of Orw E-paper and Properties Of Materialsmentioning

confidence: 99%

Optically Rewritable Liquid Crystal Displays: Characteristics and Performance

2021

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Recent achievements in the photoalignment technique for fabrication of optically rewritable electronic paper with high performance characteristics are surveyed with emphasis on temporal constraints on the exposure process. The possibility of creating electrode-free electronic paper has very important practical aspects. However, many existing studies do not include sufficient analysis on how to achieve acceptable reflective characteristics within short exposure time. In order to achieve this goal, we have applied the rotational diffusion model. We find that the parameters of the diffusion model can be adjusted to get acceptable light-reflecting characteristics within 10 s of exposure. In comparison with the long-time exposure, the reflectance coefficient reduces by 24%. The route to material improvements for optimized e-paper device is discussed.

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“…Currently, the liquid crystal display (LCD) is widely used in various applications such as smartphones, monitors, cameras, and other devices [ 1 , 2 , 3 ]. In order to drive the device, the liquid crystal (LC) molecules must be controlled by the applied voltage [ 4 , 5 ]. In addition, a vertically aligned LC device with good display performance can only be implemented when the initial orientation of the LCs is uniformly aligned.…”

Section: Introductionmentioning

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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P-76: Polarization-Controllable Light-Printer for Optically Rewritable (ORW) Liquid Crystal Displays

Cited by 6 publications

References 5 publications

Photo-switchable chiral liquid crystal with optical tristability enabled by a photoresponsive azo-chiral dopant

Photo-switchable chiral liquid crystal with optical tristability enabled by a photoresponsive azo-chiral dopant

Optically Rewritable Liquid Crystal Displays: Characteristics and Performance

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

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