9.1: A 57‐in. Wide UXGA TFT‐LCD for HDTV Application

Kim, Kyeong Hyeon; Kim, Nam Deog; Kim, Dong Gyu; Kim, Shi Yul; Park, Jheen Hyeok; Seomun, San‐Seong; Berkeley, Brian H.; Kim, Sang Soo

doi:10.1889/1.1821317

Cited by 17 publications

(4 citation statements)

References 5 publications

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“…However, retardation of the LC layer causes a color shift as the viewing angle changes from normal to oblique [17]. As a result, the viewing-angle property was further improved by dividing each pixel into two regions, to produce different voltages, which can give rise to different LC behavior in each region [18][19][20][21][22]. According to the driving method, the 8-domain mode can be classified according to many types:, including the capacitor-coupling type (C-C Type), which can generate different voltages for each domain by adding a capacitor [23], and the two-transistor type (T-T Type), which independently controls the voltages in desired regions [21,24].…”

Section: Introductionmentioning

confidence: 99%

Reduction of Gamma Distortion in Oblique Viewing Directions in Polymer-stabilized Vertical Alignment Liquid Crystal Mode

김효중¹,

Lim²,

Murali³

et al. 2017

Current Optics and Photonics

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In large liquid crystal displays, the image quality in an oblique viewing direction is a crucial issue. From this perspective, 8-domain polymer-stabilized vertical alignment (PS-VA) mode has been developed to suppress the color shift in oblique viewing directions, compared to that in 4-domain PS-VA mode. To realize the 8-domain PS-VA, the four domains in a pixel are each divided into two regions, such that applying different electric potentials result in different tilt angles in these two regions, while keeping four azimuthal directions in each domain. However, applying different voltages in a pixel causes drawbacks, such as requiring additional processes to construct a capacitor and a transistor, which will further reduce the aperture ratio. Here we propose a different approach to form the 8-domain, by controlling surface polar anchoring energy and the width of patterned electrodes in two regions of a pixel. As a result, the gamma-distortion index (GDI), measured at an azimuthal angle of 0°, is reduced by about 23% and 8%, compared to that of a conventional 4-domain at polar angles of 30° and 60° respectively.

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Section: Introductionmentioning

confidence: 99%

Reduction of Gamma Distortion in Oblique Viewing Directions in Polymer-stabilized Vertical Alignment Liquid Crystal Mode

김효중¹,

Lim²,

Murali³

et al. 2017

Current Optics and Photonics

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show abstract

“…The PVA structure was further modified as 4-domain. The viewing angle was improved by further dividing each pixel to produce voltage difference such that it brings the differences in liquid crystals behavior, this alignment is known as Super-Patterned Vertical Alignment (SPVA) [5]. According to the driving method the 8-damain mode can be classified as many types.…”

Section: Introductionmentioning

confidence: 99%

P-133: A Novel Approach to Suppress the Gamma Distortion in Oblique Viewing Angles for Polymer-stabilized Vertical Alignment Mode

Kim

Kwon

et al. 2016

SID Symposium Digest of Technical Papers

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The color shift of 4-domain polymer-stabilized (PS)-vertical alignment (VA) in oblique viewing directions is a severe problem so that a 8-domain PS-VA is required to suppress the color shift. We propose a novel approach to form the 8-domain by controlling surface polar anchoring energy and patterned electrode width in two regions of a pixel. The gamma distortion index (GDI) was reduced by about 23% and 8% compared to standard 4-domain at polar angles of 30º and 60º at an azimuthal angle of 0º, respectively.

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“…In recent years, due to their expanding requirement in the display market, wide-viewing-angle liquid-crystal displays (LCDs) have attracted considerable attention of researchers and technologists. Various driving modes, such as in-plain switching (IPS), 1,2 fringe-field switching (FFS), [3][4][5][6][7] patterned vertical alignment (PVA), [8][9][10] and multi-domain vertical alignment (MVA), [11][12][13] have been developed to meet the needs of consumers. Among all these driving modes, the vertical-alignment mode is especially more interesting due to its excellent contrast ratio in the normal direction.…”

Section: Introductionmentioning

confidence: 99%

Polymer‐stabilized pretilt angle on the surface of nanoparticle‐induced vertical‐alignment surface for multi‐domain vertical‐alignment liquid‐crystal display

et al. 2011

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Abstract— By introducing polyhedral oligomeric silsesquioxane (POSS) nanoparticles along with a controlled amount of UV‐curable reactive mesogen (RM) into a liquid‐crystalline (LC) medium, a multi‐domain vertical‐alignment LC device was successfully demonstrated. The device, possessing a vertically aligned LC director in four different azimuthal directions, exhibited a fast response time and wide‐viewing‐angle characteristics, in the absence of conventional polymer‐type vertical‐alignment layers. Electro‐optic characteristics of the fabricated device, before and after UV curing of the cell, were studied. The surface morphology of the substrate surfaces were analyzed by using field‐emission scanning electron microscopy (FESEM). The experimental results show that the technology will possibly be applicable to cost‐effective vertical‐alignment liquid‐crystal devices and is suitable for green‐technology liquid‐crystal displays.

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9.1: A 57‐in. Wide UXGA TFT‐LCD for HDTV Application

Cited by 17 publications

References 5 publications

Reduction of Gamma Distortion in Oblique Viewing Directions in Polymer-stabilized Vertical Alignment Liquid Crystal Mode

Reduction of Gamma Distortion in Oblique Viewing Directions in Polymer-stabilized Vertical Alignment Liquid Crystal Mode

P-133: A Novel Approach to Suppress the Gamma Distortion in Oblique Viewing Angles for Polymer-stabilized Vertical Alignment Mode

Polymer‐stabilized pretilt angle on the surface of nanoparticle‐induced vertical‐alignment surface for multi‐domain vertical‐alignment liquid‐crystal display

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