Analytical Treatment of Grey Levels in Antiferroelectric Liquid Crystal Displays

Pauwels, Herman; Meyere, Arnout De; Fornier, Johan

doi:10.1080/10587259508033606

Cited by 17 publications

(4 citation statements)

References 2 publications

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“…In our previous papers [4,5,6] it is explained that γ > 0 gives rise to the hysteresis loop shown in fig.3.…”

Section: Figure 2 Polarization Orientation In Adjacent Layersmentioning

confidence: 90%

“…The proof that also the sufficient conditions (2,3 and 4) are fulfilled can be found by adapting the calculations in [4] to negative γ's. The cosϕ versus E diagram is then shown in fig.6 and shows no hysteresis and no threshold.…”

Section: Thresholdless Antiferroelectric Liquid Crystalmentioning

confidence: 93%

“…If E decreases even further the liquid crystal jumps back to the antiferroelectric state from which it started. In [4,5,6] it is explained that the light transmission follows approximately the same pattern as cosϕ.…”

Section: Figure 2 Polarization Orientation In Adjacent Layersmentioning

confidence: 96%

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Analytical model for thresholdless antiferroelectric liquid crystal displays

Pauwels

Verweire

D’havé

et al. 1998

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A simple model for thresholdless antiferroelectric liquid crystal displays is presented, in which the typical thresholdless characteristic is caused by a negative interaction coefficient between the alignment layer and the liquid crystal. This negative interaction coefficient may be caused by the pairing of transverse dipole moments in adjacent layers. It causes a maximum tilt of the liquid crystal molecules in the zero-field antiferroelectric equilibrium state, which then evolves gradually to the ferroelectric state with increasing electric field. Antiferroelectric liquid crystalAntiferroelectric liquid crystals are of the smectic CA * type. This means that the molecules are

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“…In our previous papers [4,5,6] it is explained that γ > 0 gives rise to the hysteresis loop shown in fig.3.…”

Section: Figure 2 Polarization Orientation In Adjacent Layersmentioning

confidence: 90%

Section: Thresholdless Antiferroelectric Liquid Crystalmentioning

confidence: 93%

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Analytical model for thresholdless antiferroelectric liquid crystal displays

Pauwels

Verweire

D’havé

et al. 1998

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“…[5] It has been shown that the AFLC display with crossed polarizers orientated at the rubbing direction show analog gray levels. To explain the presence of gray levels in AFLCs, two possible mechanisms, homogenous [6] and heterogeneous [7] , are reported. The homogeneous mechanism assumes partial switching of the entire cell or pixel, producing a homogeneous gray along the pixel, whereas the heterogeneous mechanism assumes full switching of partial areas, the gray being obtained as a mixture of switched and unswitched areas.…”

Section: Introductionmentioning

confidence: 99%

P‐72: The Relation Between the Delay Time and the Gray Scale in Antiferroelectric Liquid Crystals

Park

Jhun

Kang

et al. 2002

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Experimentally, the propagating fingers are observed distinctly under triangular AC pulse, but not under waveforms for gray scale such as SWBR (selection voltage-well bias reset) and SBR-AC (selection bias reset signal AC). Therefore, many researchers don't accept yet that the gray scale in AFLCs is obtained as a mixture of switched and unswitched areas. So, we have investigated the switching of AFLC under waveforms for gray scale by means of CCD camera pictures and electro-optic measurements. From our experiments, we have proved that the propagating fingers appear as the form of a delayed reponse time under waveforms for gray scale and the delay time makes possible to perform the gray scale under passive matrix driving in the high resolution condition which the selection pulse width is shorter than it's response time.

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