An 82‐in. ultra‐definition 120‐Hz LCD TV using new driving scheme and advanced Super PVA technology

Kim, Sang Soo; You, Bong Hyun; Cho, Jung Hwan; Kim, Dong Gyu; Berkeley, Brian H.; Kim, Nam Deog

doi:10.1889/jsid17.2.71

Cited by 20 publications

(6 citation statements)

References 10 publications

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“…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]. More recently, the charge-shared type (CS Type) was proposed, in which upper and lower adjacent pixels are charged simultaneously using one-gate two-data [22] or half-gate two-data [25], and also the resistivity-division type (RD Type) [26] was reported, in which a pixel is divided into high-pixel (high-tilt-angle zone) and low-pixel (low-tilt-angle zone), without extra sharing gate lines and additional data lines. However, all of the technologies mentioned above give rise to reduced aperture ratio, due to the additional data lines and transistors in the 8-domain mode.…”

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

“…Recently, various kinds of VA methods with excellent viewing angle characteristics have been suggested; for examples, multi-domain VA (MVA) using protrusion, 1,2 multi-domain VA using patterned electrodes (PVA), 3,4 and linear polarized photo-alignment (LPP) technology. 5 However, the relatively weaker surface anchoring of homeotropic alignment for both MVA and PVA modes needs to be enhanced to reduce the switching time between different gray levels.…”

Section: Introductionmentioning

confidence: 99%

Anchoring energy enhancement and pretilt angle control of liquid crystal alignment on polymerized surfaces

et al. 2015

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We demonstrate enhanced surface anchoring energy and control of pretilt angle in a nematic liquid crystal cell with vertical alignment and polymerized surfaces (PS-VA). The polymerized surfaces are formed by ultraviolet (UV) irradiation-induced phase separation of a minute amount of a reactive monomer in the vertical-aligned nematic liquid crystal. By introducing a bias voltage during UV curing, surface-localized polymer protrusions with a dimension of 100nm and a field-induced pretilt angle are observed. Experimental evidences and theoretical analyses validate that PS-VA has increased surface anchoring strength by two folds and pretilt angle has been changed from 89° to 86° compared to those of a VA cell. The enabling PS-VA cell technique with excel electro-optical properties such as very good dark state, high optical contrast, and fast rise and decay times may lead to development of a wide range of applications.

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“…[1][2][3][4][5][6] To reduce power consumption while increasing image quality in LCDs, various technologies have been studied such as backlight dimming, [7][8][9][10][11][12][13][14][15] inversion methods, [16][17][18] and charge sharing methods. [19][20][21][22][23][24] Based on a demand for slim designs and low power consumption, a side-lit light-emitting diode (LED) backlight unit (BLU) has been widely adopted not only in mobile LCD applications but also in large LCDs. [9][10][11][12][13][14] To further reduce power consumption in LCDs, a dimming technique was developed.…”

Section: Introductionmentioning

confidence: 99%

Adaptive one-dimensional dimming technique for liquid crystal displays with low power consumption and high image quality

Kim

2015

Opt. Eng

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Abstract. An adaptive one-dimensional (1-D) dimming technique for liquid crystal displays that compensates for nonuniform backlight distribution is proposed. Dimming techniques that do not consider luminance distribution may cause severe visual artifacts, such as a block artifact. However, an adaptive 1-D dimming technique that considers luminance distribution can reduce power consumption without causing any visual artifacts. Hardware implementation results verified that our method achieved lower power consumption compared to nondimming techniques and removed block artifacts from International Electrotechnical Commission 62087 standard images. The power consumption using the proposed method ranged from 85.5% to 94.7% compared to nondimming techniques. Furthermore, the contrast ratio increased by up to 231% and 165% on average compared to nondimming techniques. © The Authors. Published by SPIE under a Creative Commons Attribution 3.0 Unported License. Distribution or reproduction of this work in whole or in part requires full attribution of the original publication, including its DOI.

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An 82‐in. ultra‐definition 120‐Hz LCD TV using new driving scheme and advanced Super PVA technology

Cited by 20 publications

References 10 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

Anchoring energy enhancement and pretilt angle control of liquid crystal alignment on polymerized surfaces

Adaptive one-dimensional dimming technique for liquid crystal displays with low power consumption and high image quality

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