Improvement of asymmetric viewing angle properties in single-domain fringe-field-switching liquid crystal mode by using parallel-rubbed alignment surfaces

Oh, Sang Jin; Park, Minkyu; Lee, Ho Jun; Bae, Jung Min; Park, Kyoung Ho; Lee, Joun-Ho; Kim, Byeong Koo

doi:10.1080/02678292.2013.868050

Cited by 11 publications

(2 citation statements)

References 13 publications

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“…In addition to the operating voltage, the gamma shift is also an important index to evaluate the display quality, especially for the large-area LCD [29,30]. Liquid crystal is a kind of optical anisotropic material, and thus the electro-optical performances are also different under various viewing angles, which results in the deviation of gamma curves [31][32][33][34]. Generally, serious image distortion emerges at large oblique viewing angles, which leads to the inconsistent grayscale and color display under oblique viewing angles [35][36][37].…”

Section: Introductionmentioning

confidence: 99%

Reduced off-axis gamma shift of liquid crystal display by intercepting transmittance method

Guo

et al. 2020

J. Phys. D: Appl. Phys.

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Generally, the brightness and color of one image on a large-area flat panel display are different when people watch a display image under different viewing angles. The gamma shift is used to evaluate the difference of electro-optical performances under different viewing angles, namely the gray-scale display distortion. In order to reduce the gamma shift under the oblique viewing angle, the intercepting transmittance method is proposed and illustrated based on the single-domain in-plane switching blue-phase liquid crystal display (IPS-BPLCD). The results show that the off-axis image distortion index (the quantitative evaluation index of gamma shift) can be reduced by ~72% if the transmittance ratio reduces from 100% to 80% for the IPS-BPLCD with a straight electrode structure. Moreover, the zigzag electrode structure is used as the reference to illustrate the merits of the proposed method. As a result, the operating voltage of the IPS-BPLCD can be reduced by >20%, and the off-axis image distortion index is reduced by ~47% compared with the zigzag electrode structure. Besides this, the effects of the proposed method on contrast ratio, operating voltage and color difference of IPS-BPLCD are investigated as well. In fact, the proposed method is also useful for other LCD modes and electro-optical devices to achieve wide and uniform viewing angles.

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Section: Introductionmentioning

confidence: 99%

Reduced off-axis gamma shift of liquid crystal display by intercepting transmittance method

Guo

et al. 2020

J. Phys. D: Appl. Phys.

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“…In the FFS mode, because LC directors on the surface are affected by the vertical component of the fringe-field, the viewing angle dependence on the pretilt angle does not exactly match the previous result reported for the IPS mode [6]. For the FFS mode, we employed the parallel rubbing method to reduce the tilt distribution of the bulk LC layer [16]. Although the asymmetric luminance in the field-off state and in the low grayscale level could be effectively reduced, we could not achieve a perfect solution owing to the presence of a pretilt angle on the surface.…”

Section: Introductionmentioning

confidence: 99%

Póincare Sphere Analysis of the Pretilt Angle Effect on the Viewing Angle of a Single-Domain FFS Liquid-Crystal Mode

Lee

Oh²,

Shim

et al. 2016

Journal of the Optical Society of Korea

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We demonstrated the pretilt angle effect on the viewing angle properties of a single-domain fringe-field switching (FFS) liquid crystal (LC) mode. By performing the Póincare sphere analysis, we investigated, in detail, the origin of the viewing angle asymmetry that exists in the single-domain FFS LC mode both in the field-on and field-off states. Using this analysis, we confirmed that the pretilt angle reduces the viewing angle symmetry in the single-domain FFS LC mode. Finally, we examined the effect of a zero pretilt angle on the viewing angle symmetry by evaluating real single-domain FFS LC cells.

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Design and Applications of Liquid Crystal Biophotonic Sensors for Ion Detection

2022

Advanced Photonics Research

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Liquid crystals (LCs) are nanophotonic materials which can interact with light in the molecular scale. While the LCs are widely used in various displays, last decade has witnessed emerging applications of the LCs for nondisplays. Based on the unique stimuli–responsive property and optical property, the applications of the LCs in the field of sensors are widely explored. In addition, ions are widely distributed in nature and bionts, playing critical roles in many physiological activities and ecological cycles. Appropriate amount of ions is beneficial to the human body, while the excess ions can cause irreversible damages. As a result, a variety of LC sensors are proposed to detect the ion concentration in both body fluids and water samples. This article reviews the design principles, applications, and existing problems of the LC ion sensors. The geometries, alignments, and optical signals of the sensors, which can guide the design of the devices, are first discussed. Afterward, two types of LC ion sensors aiming at detecting metal ions and nonmetallic ions, respectively, are illustrated. Finally, the current challenges and potential development directions of the LC ion sensors are introduced briefly.

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Improvement of asymmetric viewing angle properties in single-domain fringe-field-switching liquid crystal mode by using parallel-rubbed alignment surfaces

Cited by 11 publications

References 13 publications

Reduced off-axis gamma shift of liquid crystal display by intercepting transmittance method

Reduced off-axis gamma shift of liquid crystal display by intercepting transmittance method

Póincare Sphere Analysis of the Pretilt Angle Effect on the Viewing Angle of a Single-Domain FFS Liquid-Crystal Mode

Design and Applications of Liquid Crystal Biophotonic Sensors for Ion Detection

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