Elimination of light leakage over the entire viewing cone in a homogeneously-aligned liquid crystal cell

Oh, Seung-Won; Yoon, Tae–Hoon

doi:10.1364/oe.22.005808

Cited by 38 publications

(17 citation statements)

References 16 publications

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“…In all optical compensation configurations, a non-zero pretilt angle increases the light leakage [23]. However, the proposed method still shows an improvement over previous technologies, although the remaining light leakage is not negligible.…”

Section: Numerical Results and Discussionmentioning

confidence: 86%

“…We proposed the +A/+A/+C/+A/+A configuration using two sets of orthogonal positive A plates and a positive C plate, as shown in Fig. 9(a), for perfect elimination of the dark-state light leakage over the entire viewing cone in an in-planeswitching LC cell [23]. The use of two orthogonal positive A plates allows for symmetrical rotation of the polarization state on the Poincaré sphere.…”

Section: Achromatic Compensation Schemes Using Normal Dispersion Filmsmentioning

confidence: 99%

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Elimination of off-axis light leakage in a homogeneously aligned liquid crystal cell

Park

Yoon

2015

SPIE Proceedings

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Among various liquid crystal display modes, the in-plane switching mode exhibits the widest viewing angle because the liquid crystals are homogeneously-aligned initially and rotate within a plane parallel to the substrates when an in-plane field is applied. However, further improvement is still needed for viewing high-quality dark images from the bisector direction of the crossed polarizers. Several compensation schemes have been proposed to eliminate the off-axis light leakage in a homogeneously-aligned liquid crystal cell. Although a 100:1 iso-contrast contour at an wavelength of 550 nm can cover the entire viewing cone, light leakage at other wavelengths still remains very severe. In this paper we introduce achromatic optical compensation methods using uniaxial films to eliminate the off-axis light leakage at the dark state in homogeneously-aligned liquid crystal cell.Uniaxial films with different dispersion characteristics are used so that they can compensate one another to achieve achromatic optical compensation. The retardation values are optimized through numerical research with the aid of the Poincaré sphere.

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Section: Numerical Results and Discussionmentioning

confidence: 86%

Section: Achromatic Compensation Schemes Using Normal Dispersion Filmsmentioning

confidence: 99%

Elimination of off-axis light leakage in a homogeneously aligned liquid crystal cell

Park

Yoon

2015

SPIE Proceedings

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“…Moreover, the turn-off time is not dependent on the pretilt angle. Therefore, to enhance viewing angle characteristics, viewing angle compensation methods developed for a conventional FFS cell with α ≠ 0 can be directly applied to a zero-rubbing-angle cell with little modification1718192021.…”

Section: Resultsmentioning

confidence: 99%

Fast fringe-field switching of a liquid crystal cell by two-dimensional confinement with virtual walls

Choi

Park

et al. 2016

Sci Rep

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We report a simple method for reducing the response time of a fringe-field switching liquid crystal cell by using two-dimensional confinement of the liquid crystals. Through both numerical calculations and experiments, we show that the switching speed can be increased by several fold in a fringe-field switching cell by simply using a rubbing angle of zero, which causes virtual walls to be built when an electric field is applied between the interdigitated electrodes and the common electrode, without requiring additional fabrication steps or complicated drive schemes. Furthermore, the devices fabricated with this method exhibit a reduced color shift and excellent dynamic stability, even with a high applied voltage and under external pressure.

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“…A VA negative LC layer is sandwiched between the top substrate and bottom dielectric layer; the cell gap d is uniform throughout all the pixel area. In order to achieve a relatively better dark state in the R region, on each side of the TR‐LCD panel, a broadband half‐wave plate and quarter‐wave plate together with a linear polarizer and analyzer works as a circular polarizer . Additionally, a negative C‐plate is adopted to partially compensate the phase retardation from the VA negative LC layer .…”

Section: Device Structure and Principlementioning

confidence: 99%

Simulation study of single‐cell‐gap transflective liquid crystal display with nonuniform potential

et al. 2019

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A single‐cell‐gap transflective liquid crystal display with a nonuniform electric potential is demonstrated. The top substrate has a top planar common electrode, a transparent dielectric layer with a general dielectric constant is coated on the bottom substrate, and two planar pixel electrodes with the same size are coated on the dielectric layer and the bottom substrate, respectively. With the different gaps between the two planar pixel electrodes and top planar pixel electrode, the nonuniform electric potential from the transmissive region (T region) to the reflective region (R region) is generated, while a bumpy reflector is coated under the bottom substrate. In this device, with the dielectric layer, the pixel and common electrodes generate a strong electric potential in the T region and a relatively weak electric potential in the R region. Consequently, the T and R regions accumulate the same optical phase retardation. The simulation results show that the display exhibits reasonably low operating voltage, high optical efficiency, and well‐matched voltage‐dependent transmittance and reflectance curves. Besides, the fabrication process and the driving mode of the transflective liquid crystal display are relatively simple, and it is suitable for mobile applications.

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Elimination of light leakage over the entire viewing cone in a homogeneously-aligned liquid crystal cell

Cited by 38 publications

References 16 publications

Elimination of off-axis light leakage in a homogeneously aligned liquid crystal cell

Elimination of off-axis light leakage in a homogeneously aligned liquid crystal cell

Fast fringe-field switching of a liquid crystal cell by two-dimensional confinement with virtual walls

Simulation study of single‐cell‐gap transflective liquid crystal display with nonuniform potential

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