Importance of Ion Transport in Industrial LCD Applications

Vleeschouwer, Herbert De; Bougrioua, F.; Pauwels, Herman

doi:10.1080/10587250108025696

Cited by 24 publications

(12 citation statements)

References 5 publications

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“…Once electrostatic charges are formed on the polyimide layers, they last for some time during the manufacturing process, creating their own electric field between the two alignment layers. Then, liquid crystal director responds to the electric field from the electrostatic charges on the polyimide films, and this leads to unwanted light-transmission modulation of the liquid crystal that can be recognized as ghost images on the LCD panel [6,7].…”

Section: Introductionmentioning

confidence: 99%

Electrical conduction of polyimide films prepared from polyamic acid (PAA) and pre-imidized polyimide (PI) solution

Kim

Lee

et al. 2008

E-Polymers

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Electrical conduction characteristics in two different polyimide films prepared by the imidization of polyamic acid (PAA) and pre-imidized polyimide (PI) solution were investigated. It is found that the current density of the polyimide film from PAA was higher than that of the polyimide film from PI at the same electric field, even though the conduction mechanism in both polyimide films follows the ionic hopping model. The hopping distance was calculated to be 2.8 nm for PAA type and 3.2 nm for PI type polyimide film. It is also found that the decay rate of the residual electrostatic charges on the polyimide films becomes faster in the PAA type than in the PI type polyimide film.

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Section: Introductionmentioning

confidence: 99%

Electrical conduction of polyimide films prepared from polyamic acid (PAA) and pre-imidized polyimide (PI) solution

Kim

Lee

et al. 2008

E-Polymers

View full text Add to dashboard Cite

show abstract

Section: Introductionmentioning

confidence: 99%

Electrical conduction of polyimide films prepared from polyamic acid (PAA) and pre-imidized polyimide (PI) solution

Kim¹,

Kim²,

Lee³

et al. 2007

Express Polym. Lett.

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Abstract. Electrical conduction characteristics in two different polyimide films prepared by the imidization of polyamic acid (PAA) and pre-imidized polyimide (PI) solution were investigated. It is found that the current density of the polyimide film from PAA was higher than that of the polyimide film from PI at the same electric field, even though the conduction mechanism in both polyimide films follows the ionic hopping model. The hopping distance was calculated to be 2.8 nm for PAA type and 3.2 nm for PI type polyimide film. It is also found that the decay rate of the residual electrostatic charges on the polyimide films becomes faster in the PAA type than in the PI type polyimide film.

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“…However, ions are always present in liquid crystals [2,8]. Their negative impact on the overall performance of liquid crystal devices was reported in many publications [9][10][11][12][13][14][15][16][17][18]. For example, ions in liquid crystals can cause slow response, image sticking, image flickering, the reduction of the voltage holding ratio, and color staining and non-uniformity of the image, to name a few.…”

Section: Introductionmentioning

confidence: 99%

“…In the considered example, the screening electric field compensates for the applied electric field in less than 2 s, resulting in the substantial alteration of the liquid crystal performance. An extensive discussion of the ion-related phenomena in liquid crystals are beyond the scope of this paper, and readers are referred to the original publications [9][10][11][12][13][14][15][16][17][18][19][20][21][22] and references therein] for more details. …”

Section: Ions In Liquid Crystalsmentioning

confidence: 99%

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Nano-Objects and Ions in Liquid Crystals: Ion Trapping Effect and Related Phenomena

2015

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Abstract:The presence of ions in liquid crystals is one of the grand challenges that hinder the application of liquid crystals in various devices, which include advanced 3-D and flexible displays, tunable lenses, etc. Not only do they compromise the overall performance of liquid crystal devices, ions are also responsible for slow response, image sticking, and image flickering, as well as many other negative effects. Even highly purified liquid crystal materials can get contaminated during the manufacturing process. Moreover, liquid crystals can degrade over time and generate ions. All of these factors raise the bar for their quality control, and increase the manufacturing cost of liquid crystal products. A decade of dedicated research has paved the way to the solution of the issues mentioned above through merging liquid crystals and nanotechnology. Nano-objects (guests) that are embedded in the liquid crystals (hosts) can trap ions, which decreases the ion concentration and electrical conductivity, and improves the electro-optical response of the host. In this paper, we (i) review recently published works reporting the effects of nanoscale dopants on the electrical properties of liquid crystals; and (ii) identify the most promising inorganic and organic nanomaterials suitable to capture ions in liquid crystals.

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Importance of Ion Transport in Industrial LCD Applications

Cited by 24 publications

References 5 publications

Electrical conduction of polyimide films prepared from polyamic acid (PAA) and pre-imidized polyimide (PI) solution

Electrical conduction of polyimide films prepared from polyamic acid (PAA) and pre-imidized polyimide (PI) solution

Electrical conduction of polyimide films prepared from polyamic acid (PAA) and pre-imidized polyimide (PI) solution

Nano-Objects and Ions in Liquid Crystals: Ion Trapping Effect and Related Phenomena

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