Optimization of the Pretilt Angle of Liquid Crystal Alignment for Ips Mode Lcd

Tahata, S.; Yuuki, And

doi:10.1080/15421400490465780

Cited by 6 publications

(3 citation statements)

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“…41 There is a research direction to optimize the pretilt angle to improve the viewing angle further for the IPS panel. [42][43][44] Therefore, we have studied the effect of graphene on the pretilt angle of E7. It has been shown that one of the most accurate methods to measure h o is the transient current I(t) method, 40 which has been employed to measure c 1 in this paper.…”

Section: Experiments and Resultsmentioning

confidence: 99%

Faster in-plane switching and reduced rotational viscosity characteristics in a graphene-nematic suspension

Basu

Kinnamon

Skaggs

et al. 2016

Journal of Applied Physics

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The in-plane switching (IPS) for a nematic liquid crystal (LC) was found to be considerably faster when the LC was doped with dilute concentrations of monolayer graphene flakes. Additional studies revealed that the presence of graphene reduced the rotational viscosity of the LC, permitting the nematic director to respond quicker in IPS mode on turning the electric field on. The studies were carried out with several graphene concentrations in the LC, and the experimental results coherently suggest that there exists an optimal concentration of graphene, allowing a reduction in the IPS response time and rotational viscosity in the LC. Above this optimal graphene concentration, the rotational viscosity was found to increase, and consequently, the LC no longer switched faster in IPS mode. The presence of graphene suspension was also found to decrease the LC's pretilt angle significantly due to the π-π electron stacking between the LC molecules and graphene flakes. To understand the π-π stacking interaction, the anchoring mechanism of the LC on a CVD grown monolayer graphene film on copper substrate was studied by reflected crossed polarized microscopy. Optical microphotographs revealed that the LC alignment direction depended on monolayer graphene's hexagonal crystal structure and its orientation.

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Section: Experiments and Resultsmentioning

confidence: 99%

Faster in-plane switching and reduced rotational viscosity characteristics in a graphene-nematic suspension

Basu

Kinnamon

Skaggs

et al. 2016

Journal of Applied Physics

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show abstract

“…46 There exists a research direction to optimize the pretilt angle to improve the viewing angle further for the IPS panel. [47][48][49] Therefore, our results on the reduction of the LC pretilt angle by incorporating NDs is important and relevant for developing LCDs with wider viewing angles.…”

Section: Discussionmentioning

confidence: 99%

Evidence of nanodiamond-self-assembly in a liquid crystal, and the consequent impacts on the liquid crystal properties

et al. 2017

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A small quantity of nanodiamonds (NDs) was dispersed in a nematic liquid crystal (LC), and the NDs were found to exhibit an anisotropic self-assembly along the nematic director. The anisotropic assembly of the NDs in the LC matrix was probed by measuring the dielectric anisotropy, Δε, of the LC+ND system, which showed a significant increase in Δε. Additional studies revealed that the presence of NDs reduced the rotational viscosity and the pretilt angle of the LC. The studies were carried out with several ND concentrations in the LC and the experimental results coherently suggest that there exists an optimal concentration of ND. Above this optimal ND concentration, the anisotropic assembly of the NDs was found to be not effective anymore. The rotational viscosity and the pretilt angle of the LC were found to increase above the optimal concentration of ND.

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“…The LC cell prototypes are based on the in-plane switching (IPS) and fringe field switching (FFS) modes of TFT-LCDs. The IPS and FFS modes of TFT-LCDs have been highly favored in portable displays in recent years due to the superior features, such as wide view angle, low operating voltage, low color shift, high transmittance and excellent pressure resistance for touch panels, and so on [40][41][42]. In IPS and FFS LCDs, in order to reduce the light leakage in a black state at diagonal viewing angles, planar alignment layer with lower TPA values are usually required [43].…”

Section: Optical and Electro-optical Propertiesmentioning

confidence: 99%

Synthesis and characterization of soluble ester-containing polyimide alignment layers with high voltage holding ratio features and potential applications in TFT-LCDs

Zhi¹,

Bi²,

Liu³

et al. 2019

Express Polym. Lett.

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Polyimide (PI) represents a class of high performance heteroaromatic polymers characterized by excellent thermal and environmental stability, high mechanical and dielectric properties as well as flexible molecular structure designability [1-3]. Various functionalities have been achieved for PIs via elaborate combination of specific dianhydride and diamine monomers so as to meet the property demands of high-tech applications [4-6]. Among the various functional PIs, semi-alicyclic PIs derived from alicyclic dianhydrides and aromatic diamines proved to possess the best combined properties considering the polymerization reactivity and the acidity/basicity of the starting monomers [7]. Thus, such kinds of semi-alicyclic PIs usually exhibited superior thermal and mechanical properties, and higher molecular weights to their analogous PIs derived from aromatic dianhydrides and alicyclic diamines or from both of alicyclic dianhydride and diamines [8]. Good comprehensive properties of semi-alicyclic PIs derived from alicyclic dianhydrides and aromatic diamines make them much attractive in optoelectronic fields in recent years [9-11]. The successful 923

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Optimization of the Pretilt Angle of Liquid Crystal Alignment for Ips Mode Lcd

Cited by 6 publications

References 0 publications

Faster in-plane switching and reduced rotational viscosity characteristics in a graphene-nematic suspension

Faster in-plane switching and reduced rotational viscosity characteristics in a graphene-nematic suspension

Evidence of nanodiamond-self-assembly in a liquid crystal, and the consequent impacts on the liquid crystal properties

Synthesis and characterization of soluble ester-containing polyimide alignment layers with high voltage holding ratio features and potential applications in TFT-LCDs

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