Compensation for phase dispersion in horizontal-switching liquid crystal cell for improved viewing angle

Lee, Joun‐Ho; Son, Jung-Hee; Choi, Sun Ha; Lee, Wa-Ryong; Kim, Kyungmi; Yang, Jianhua; Kim, Jae Chang; Choi, Hyun‐Chul; Lee, Gi‐Dong

doi:10.1088/0022-3727/39/24/008

Cited by 16 publications

(7 citation statements)

References 10 publications

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“…This asymmetry negatively affects the viewing angle properties such as the light leakage, color shift, and grayscale inversion in the specific viewing angle direction [5,6]. To enhance the viewing angle properties of the single-domain planar mode, many optical compensation techniques have been proposed [7][8][9][10][11][12][13][14][15]. These optical compensation methods can reduce the light leakage and remove the grayscale inversion.…”

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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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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“…Today, the performance of the displaying image quality of a liquid crystal displays (LCDs) has been developed by extensively studying a variety of LC modes such as twisted nematic (TN) [1], in-plane switching (IPS) [2], fringe-field switching (FFS) [3], patterned vertical alignment (PVA) [4] and multi-domain VA (MVA) [5]. In spite of their superior optical modes, current technologies of liquid crystal displays (LCDs) are required to realize better electro-optical characteristics such as a wide viewing angle, high resolution and fast response time in order to win the competition with an organic light emitting diode (OLED) display [6][7][8]. Recently, the photo-aligning system which is one of non-contact alignment methods has been intensively studied for improving the displaying performance of LCDs [9].…”

Section: Introductionmentioning

confidence: 99%

P‐113: Improvement of the Surface Anchoring Energy of the Photo‐Alignment Layer in a Liquid Crystal Display using the Two‐Band UV Exposure Method

Mun

Park

Lee³

et al. 2015

Symp Digest of Tech Papers

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In this paper, we proposed the photo-alignment method with the strong surface anchoring energy by applying the two band UV exposure method on the photosensitive PI layer embedded with reactive mesogens (RMs) for achieving the fast response time properties of the in-plane switching (IPS) LC mode. We first enhanced the interconnection between a RM polymer and a photo-alignment layer through high band ultra-violet (UV) exposure on the long pass UV filter over 340 nm and then established the alignment of LCs through low band linear polarized UV exposure at 254 nm after eliminating the UV filter. As results, we measured the surface anchoring energy and response time of the proposed photo-alignment method and also confirmed that the optical response time was reduced by approximately 22.3 % compared to that of the IPS-LC cell of pure photo-alignment layer. Author KeywordsPhoto-alignment layer; two-band ultra-violet exposure method; surface anchoring energy; optical response time; in-plane switching liquid crystal cell

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“…Liquid crystal display (LCD) technologies have been developed to provide better electrooptical characteristics such as a wide viewing angle, fast response time, and high contrast ratio [1][2][3][4][5][6][7][8][9]. In spite of superior optical performances, studies on advanced LCD technologies are still required to realize more convenient and interactive display performance.…”

Section: Introductionmentioning

confidence: 99%

A high transmittance color liquid crystal display mode with controllable color gamut and transparency

Mun

Kang

Lee³

et al. 2014

Opt. Express

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In this paper, we propose a color transparent liquid crystal (LC) mode that can control the properties of the color gamut and transparency in a single panel. To achieve high transmittance in the transparent LC mode, a reactive mesogen (RM) with embedded color dichroic dyes was applied instead of a color filter. Basically, the LC mode applied a 3-terminal electrode structure to switch between the transparent LC mode and the conventional color LC mode. Depending on the direction of the applied voltage, we can operate both the color mode and the transparent mode in a single panel, and modulate the transparency and color purity of the cell through appropriate voltage control. In the experiments, we confirmed that the transmittance and the color gamut of the cell were 39.4% and 2% in the transparent LC mode and 14.9% and 34% in the color LC mode, respectively. Modulation of the color gamut and transparency between each LC mode are also demonstrated in the paper.

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Compensation for phase dispersion in horizontal-switching liquid crystal cell for improved viewing angle

Cited by 16 publications

References 10 publications

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

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

P‐113: Improvement of the Surface Anchoring Energy of the Photo‐Alignment Layer in a Liquid Crystal Display using the Two‐Band UV Exposure Method

A high transmittance color liquid crystal display mode with controllable color gamut and transparency

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