Image flickering-free polymer stabilized fringe field switching liquid crystal display

Jiang, Yingfei; Qin, Guangkui; Xu, Xiaoguang; Zhou, Li; Lee, Seung‐Hee; Yang, Deng‐Ke

doi:10.1364/oe.26.032640

Cited by 9 publications

(12 citation statements)

References 24 publications

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“…Therefore, the flexoelectric effect can also be reduced by decreasing the spatial variation of the liquid crystal. One efficient way to achieve the goal is to polymer stabilization where an anisotropic polymer network is dispersed in liquid crystals . In the polymer stabilization, a small amount of mesogenic monomer is mixed with the liquid crystal host.…”

Section: Reduction Of Image Flickering By Decreasing Spatial Variatiomentioning

confidence: 99%

“…The coordinate is chosen in such a way that the x‐axis is perpendicular to the stripe electrode, y‐axis is parallel to the stripe electrode, and the z‐axis is perpendicular to the display cell substrate. Theoretically, the aligning effect of the polymer network on the liquid crystal can be described by an effective aligning field given by the following:

E_{p} = {(πcK / 2 ε_{o} Δ ε)}^{1 / 2} / R,

where R is the radius of the fibril of the polymer network, c is the concentration of the polymer network, and K is the average elastic constant. For example, when R = 0.2 μm, K = 10 −11 N , and c = 1%, then E p = 0.2V/μ m .…”

Section: Reduction Of Image Flickering By Decreasing Spatial Variatiomentioning

confidence: 99%

“…One efficient way to achieve the goal is to polymer stabilization where an anisotropic polymer network is dispersed in liquid crystals. [25][26][27][28][29][30][31][32] In the polymer stabilization, a small amount of mesogenic monomer is mixed with the liquid crystal host. The monomer is polymerized in the liquid crystal state in the absence of an applied voltage, where the direction of the liquid crystal director is uniform in space.…”

Section: Reduction Of Image Flickering By Decreasing Spatial Variatmentioning

confidence: 99%

“…The coordinate is chosen in such a way that the x-axis is perpendicular to the stripe electrode, y-axis is parallel to the stripe electrode, and the z-axis is perpendicular to the display cell substrate. Theoretically, the aligning effect of the polymer network on the liquid crystal can be described by an effective aligning field given by the following 25,29 :…”

Section: Simulation Studymentioning

confidence: 99%

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Image flickering reduction by dimer and polymer stabilization in FFS liquid crystal display

et al. 2019

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Power consumption of a liquid crystal display, when it is used to display static images, can be reduced by using low frequency driving. However, when the driving frequency is decreased, the brightness of the display may change with time, a phenomenon known as image flickering. One factor responsible for the flickering issue is flexoelectric effect which is sensitive to the polarity of the applied voltage. We show that the flickering in fringe field switching (FFS) LCD can be significantly reduced by doping a liquid crystal dimer and using polymer stabilization. We demonstrated that 2 Hz driving frequency can be used to display static images.

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Section: Reduction Of Image Flickering By Decreasing Spatial Variatiomentioning

confidence: 99%

E_{p} = {(πcK / 2 ε_{o} Δ ε)}^{1 / 2} / R,

Section: Reduction Of Image Flickering By Decreasing Spatial Variatiomentioning

confidence: 99%

Section: Reduction Of Image Flickering By Decreasing Spatial Variatmentioning

confidence: 99%

Section: Simulation Studymentioning

confidence: 99%

See 2 more Smart Citations

Image flickering reduction by dimer and polymer stabilization in FFS liquid crystal display

et al. 2019

Self Cite

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“…The current mainstream display technologies include liquid crystal displays (LCDs), organic light-emitting diodes (OLEDs), and micro-sized light-emitting diodes (micro-LEDs) [1][2][3]. LCDs have advantages such as long life, low price, and mature technology [4][5][6]; however, the overall light output efficiencies of large-sized direct-lit backlight LCDs are still low and their structure is complex, which makes it difficult to reduce the overall thickness [7][8][9].…”

Section: Introductionmentioning

confidence: 99%

Highly Reflective Thin-Film Optimization for Full-Angle Micro-LEDs

Ho²,

Chen

2021

Nanoscale Res Lett

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Displays composed of micro-light-emitting diodes (micro-LEDs) are regarded as promising next-generation self-luminous screens and have advantages such as high contrast, high brightness, and high color purity. The luminescence of such a display is similar to that of a Lambertian light source. However, owing to reduction in the light source area, traditional secondary optical lenses are not suitable for adjusting the light field types of micro-LEDs and cause problems that limit the application areas. This study presents the primary optical designs of dielectric and metal films to form highly reflective thin-film coatings with low absorption on the light-emitting surfaces of micro-LEDs to optimize light distribution and achieve full-angle utilization. Based on experimental results with the prototype, that have kept low voltage variation rates, low optical losses characteristics, and obtain the full width at half maximum (FWHM) of the light distribution is enhanced to 165° and while the center intensity is reduced to 63% of the original value. Hence, a full-angle micro-LEDs with a highly reflective thin-film coating are realized in this work. Full-angle micro-LEDs offer advantages when applied to commercial advertising displays or plane light source modules that require wide viewing angles.

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Flicker‐Free Fringe‐Field Switching Liquid Crystal Display Operable at Extremely Low Frequencies for Power Saving

Choi

Lee

et al. 2021

Adv Eng Mater

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A fringe‐field switching (FFS) liquid crystal (LC) mode used with a negative dielectric LC (n‐LC) that is operable at an extremely low‐frequency signal voltage regime, without image flickering, is proposed. By doping charge‐trapping fullerenes (doping concentration: 0.2 wt%) into a low‐resistivity polyimide LC alignment layer of the FFS n‐LC mode, the mobile ionic‐charge density within the n‐LC layer can be drastically decreased. Thus, excellent voltage‐holding ratios of 98.24% and 87.91% are achievable in the proposed FFS n‐LC mode at low operation frequencies of 0.5 Hz and 0.2 Hz, respectively, corresponding to the improvement rates of 155.69% and 1127.05% at each operation frequency, compared with the FFS n‐LC mode without the fullerene doping case. The evaluation results by the modulation flicker level reveal that the operation frequency of the proposed device scheme can be decreased significantly (≈0.2 Hz) without inducing the perceptible image‐flickering problems.

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Image flickering-free polymer stabilized fringe field switching liquid crystal display

Cited by 9 publications

References 24 publications

Image flickering reduction by dimer and polymer stabilization in FFS liquid crystal display

Image flickering reduction by dimer and polymer stabilization in FFS liquid crystal display

Highly Reflective Thin-Film Optimization for Full-Angle Micro-LEDs

Flicker‐Free Fringe‐Field Switching Liquid Crystal Display Operable at Extremely Low Frequencies for Power Saving

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