Influence of γ-Fe2O3 nanoparticles doping on the image sticking in VAN-LCD

Liu, Ningning; Wang, Mohan; Tang, Zongyuan; Gao, Lin; Jing, Shuai; Gao, Na; Xing, Hongyan; Meng, Xiangshen; He, Zhenghong; Li, Jian; Cai, Minglei; Wang, Xiaoyan; Ye, Wenjiang

doi:10.3788/col202018.033501

Cited by 4 publications

(3 citation statements)

References 15 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The evaluation method proposed in Ref. [21] was used to investigate the RDCV values of the doped LC system at different times. Since the dielectric anisotropy of pure LC used in experiment was negative, we mainly measured the RDCV value of the VAN cell.…”

Section: Evaluation Methods and Principlesmentioning

confidence: 99%

Stability of liquid crystal systems doped with γ-Fe₂O₃ nanoparticles*

Zhang¹,

Liu²,

Tang³

et al. 2021

Chinese Phys. B

View full text Add to dashboard Cite

In order to explore the stability of a liquid crystal (LC) system doped with γ-Fe2O3 nanoparticles, the physical properties (clearing point, dielectric properties), electro-optical properties and residual direct-current voltage (RDCV) of the doped LC system were measured and evaluated at different times. First, the temperature was controlled by precision hot stage, and the clearing point temperature of doped LC was observed and measured by a polarized optical microscope. Using a precision LCR meter, we measured the capacitance-voltage curves of the doped LC system at the temperature of 27 °C. The dielectric constant of doped LC was calculated by the dualcell capacitance method. Then, the electro-optical properties of the doped LC system were measured. Finally, the RDCV of the doped LC system was measured and calculated. After five months, the parameters of the doped LC system were re-measured and analyzed under the same conditions to evaluate its stability. The experimental results show that, within five months, the clearing point change rate of doped LC is in the range of 0.24%–1.37%, the change of dielectric anisotropy is in the range of 0.035–0.2, the curves of electro-optical properties are basically fitted, and the change rate of saturated RDCV is about 11.2%, which basically indicate that the LC system doped with γ-Fe2O3 nanoparticles has good stability.

show abstract

Section: Evaluation Methods and Principlesmentioning

confidence: 99%

Stability of liquid crystal systems doped with γ-Fe₂O₃ nanoparticles*

Zhang¹,

Liu²,

Tang³

et al. 2021

Chinese Phys. B

View full text Add to dashboard Cite

show abstract

“…To alleviate the potential issue of image sticking, the choice of negative Δε LC and alignment layer would need to be optimized to reduce the affinity for the ions to adsorb to the alignment layer [ 81 ]. Another potential solution that has been shown to reduce image sticking is through doping of either the LC phase or alignment layer with nanoparticles such as γ-Fe2O3 [ 82 ] and TiO2 [ 83 ]. The doping method would need to be further explored in PSCLC systems, as the proposed mechanism for reducing image sticking relies on ion impurities being absorbed by the nanoparticles, which could reduce tuning ability.…”

Section: Electro-optic Response In Psclcsmentioning

confidence: 99%

Recent Advances in Electro-Optic Response of Polymer-Stabilized Cholesteric Liquid Crystals

et al. 2023

View full text Add to dashboard Cite

Cholesteric liquid crystals (CLC) are molecules that can self-assemble into helicoidal superstructures exhibiting circularly polarized reflection. The facile self-assembly and resulting optical properties makes CLCs a promising technology for an array of industrial applications, including reflective displays, tunable mirror-less lasers, optical storage, tunable color filters, and smart windows. The helicoidal structure of CLC can be stabilized via in situ photopolymerization of liquid crystal monomers in a CLC mixture, resulting in polymer-stabilized CLCs (PSCLCs). PSCLCs exhibit a dynamic optical response that can be induced by external stimuli, including electric fields, heat, and light. In this review, we discuss the electro-optic response and potential mechanism of PSCLCs reported over the past decade. Multiple electro-optic responses in PSCLCs with negative or positive dielectric anisotropy have been identified, including bandwidth broadening, red and blue tuning, and switching the reflection notch when an electric field is applied. The reconfigurable optical response of PSCLCs with positive dielectric anisotropy is also discussed. That is, red tuning (or broadening) by applying a DC field and switching by applying an AC field were both observed for the first time in a PSCLC sample. Finally, we discuss the potential mechanism for the dynamic response in PSCLCs.

show abstract

“…As mentioned earlier, LC-based devices used in televisions and monitors must achieve the same performance even under long-term operation. A problem of existing LCDs is the phenomenon of an image sticking from long-term operation [ 23 , 24 , 25 , 26 , 27 ]. In addition to suppressing the screening effect and preventing the generation of a residual direct current (DC) voltage, the introduced TiO 2 NPs also maintained the vertical alignment ability of hybrid PI layer due to the effects of the long hydrophobic alkyl chains of stearic acid.…”

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

View full text Add to dashboard Cite

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.

show abstract

Influence of γ-Fe2O3 nanoparticles doping on the image sticking in VAN-LCD

Cited by 4 publications

References 15 publications

Stability of liquid crystal systems doped with γ-Fe₂O₃ nanoparticles*

Stability of liquid crystal systems doped with γ-Fe₂O₃ nanoparticles*

Recent Advances in Electro-Optic Response of Polymer-Stabilized Cholesteric Liquid Crystals

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

Contact Info

Product

Resources

About

Influence of γ-Fe2O3 nanoparticles doping on the image sticking in VAN-LCD

Cited by 4 publications

References 15 publications

Stability of liquid crystal systems doped with γ-Fe2O3 nanoparticles*

Stability of liquid crystal systems doped with γ-Fe2O3 nanoparticles*

Recent Advances in Electro-Optic Response of Polymer-Stabilized Cholesteric Liquid Crystals

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

Contact Info

Product

Resources

About

Stability of liquid crystal systems doped with γ-Fe₂O₃ nanoparticles*

Stability of liquid crystal systems doped with γ-Fe₂O₃ nanoparticles*