Temperature dependence of residual DC voltage and its evaluation parameter related to liquid‐crystal and alignment‐layer materials

Mizusaki, Masanobu; Miyashita, Tetsuya; Uchida, Tatsuo; Yamada, Y.; Ishii, Yoko; Mizushima, Shigeaki

doi:10.1889/1.2905045

Cited by 5 publications

(2 citation statements)

References 7 publications

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“…Cell-E Test enables collecting key parameters of LC models, showing that design models can be verified with actual parameters of cell panels by using Cell-E Test. Parameters of LCD models vary with respect to temperature [15][16][17]. Cell-E Test can be also used for evaluating temperature dependency of LC by measuring under multiple temperature conditions.…”

Section: Resultsmentioning

confidence: 99%

Cell panel electrical test for evaluating the electrical characteristics of liquid crystal displays

Miyake¹,

Ota²,

Nishimura

2014

Journal of Information Display

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Electrical models of liquid crystal display (LCD) have been studied and used in design simulation. Using the right LCD models is indispensable to accomplish high-quality and highly reliable LCDs. This paper presents a cell panel electrical test (Cell-E Test) for evaluating the electrical characteristics of LCDs. The Cell-E Test was derived from in-process electrical testing for thin film transistor arrays, and utilizes charge measurement for measuring the capacitance value of a pixel. The capacitance-voltage (C-V) and capacitance-time (C-t) characteristics can be measured using a sweeping-applied voltage and based on the period of applying voltage in the Cell-E Test. In this study, actual C-V and C-t characteristics were measured by applying the Cell-E Test to a twisted-nematic active-matrix LCD (TN AM-LCD). The parameters of liquid crystal models were extracted from the data measured using the least-squares method, to show that design models can be verified with the actual parameters of cell panels through the Cell-E Test.

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Section: Resultsmentioning

confidence: 99%

Cell panel electrical test for evaluating the electrical characteristics of liquid crystal displays

Miyake¹,

Ota²,

Nishimura

2014

Journal of Information Display

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“…Two necessary factors for image sticking of LCDs is direct current bias (DCB) [8,9] and the presence of ionic impurity in LC [10][11][12]. When the two conditions exist simultaneously, ions will accumulate toward the electrode and thus form the residual direct current voltage (RDCV) [13].…”

Section: Introductionmentioning

confidence: 99%

Evaluation and improvement of image sticking in in-plane switching liquid crystal display

Liu

Wang

Gao

et al. 2020

J. Phys. D: Appl. Phys.

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Image sticking in liquid crystal display (LCD) can affect the display quality. The saturated residual direct current voltage (SRDCV) can be obtained by analyzing the change in the capacitance of LC cell under the direct current bias, through which image sticking can be evaluated. On this basis, the image sticking was evaluated in the in-plane switching (IPS) cell filled in the LC with negative dielectric anisotropy for different electrode structures, cell gaps (i.e. 3.8, 5.8, and 7.5 µm), and doping concentrations of γ-Fe2O3 nanoparticles (i.e. 0.068, 0.136, 0.204, and 0.272 wt%). The SRDCV decreases under the same conditions by adjusting the ratio of electrode width and electrode gap and it decreases with the cell gap increases. For the thickness of 3.8 µm, the SRDCV initially decreases and then increases as the doping concentration of γ-Fe2O3 nanoparticles increases; while for the thicknesses of 5.8 µm and 7.5 µm, the SRDCV decreases as the doping concentration of γ-Fe2O3 nanoparticles increases. The results show that the structure design of the IPS-LCD and the doping of nanoparticles can effectively improve image sticking and provide useful guidance for enhancing the display quality of LCD.

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P‐144: A Systematic Research of Image Sticking in Fringe Field Switching Liquid Crystal Displays

Chung

Liao

et al. 2018

Symp Digest of Tech Papers

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A systematic research of image sticking (IS) in a fringe field switching liquid crystal displays is demonstrated. After the IS test of mosaic pattern and switching to the mid-grey level image, the root mean square voltage (Vrms) difference between the black and white block should be controlled under the 1 mV to avoid the phenomenon of image sticking detected by the human eye. A detailed analysis of voltage calculation and how to decrease the difference ofVrms are presented. Author Keywords image sticking; fringe field switching; flexoelectric effect; residual DC voltage; P-144 / J.-C. Ke SID 2018 DIGEST • 1707 ISSN 0097-996X/18/4703-1707-$1.00

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Temperature dependence of residual DC voltage and its evaluation parameter related to liquid‐crystal and alignment‐layer materials

Cited by 5 publications

References 7 publications

Cell panel electrical test for evaluating the electrical characteristics of liquid crystal displays

Cell panel electrical test for evaluating the electrical characteristics of liquid crystal displays

Evaluation and improvement of image sticking in in-plane switching liquid crystal display

P‐144: A Systematic Research of Image Sticking in Fringe Field Switching Liquid Crystal Displays

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