Deformed helix ferroelectric liquid crystal display: A new electrooptic mode in ferroelectric chiral smectic C liquid crystals

Beresnev, L. A.; Chigrinov, Vladimir G.; Dergachev, D.I.; Poshidaev, E. P.; Fünfschilling, J.; Schadt, M.

doi:10.1080/02678298908026421

Cited by 266 publications

(136 citation statements)

References 14 publications

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“…II as a tool of theoretical investigation into the electro-optical properties of DHFLC gratings with subwavelength pitch. It was previously demonstrated that a short helix pitch FLC (P = 0.4-0.8 μm) provides an effective phase shift change of a transmitted polarized light beam as a function of the applied electric field intensity [29]. The new mixtures with the helix pitch being in UV region [37] make it possible to get rid of complications related to the light scattering effects.…”

Section: Discussionmentioning

confidence: 99%

“…[27,28] for stratified anisotropic media and goes beyond the limitations of Jones calculus. We apply the method for systematic treatment of the technologically important case of the deformed helix ferroelectric liquid crystals (DHFLCs) [29,30], where the LC director rotates about a uniform twist axis parallel to the substrates forming the ferroelectric LC (FLC) helical structure (see Fig. 1).…”

Section: Introductionmentioning

confidence: 99%

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Polarization-gratings approach to deformed-helix ferroelectric liquid crystals with subwavelength pitch

et al. 2011

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Electro-optical properties of deformed helix ferroelectric liquid crystal (DHFLC) cells are studied by using a general theoretical approach to polarization gratings in which the transmission and reflection matrices of diffraction orders are explicitly related to the evolution operator of equations for the Floquet harmonics. In the short-pitch approximation, a DHFLC cell is shown to be optically equivalent to a uniformly anisotropic biaxial layer where one of the optical axes is normal to the bounding surfaces. For in-plane anisotropy, orientation of the optical axes and birefringence are both determined by the voltage applied across the cell and represent the parameters that govern the transmittance of normally incident light passing through crossed polarizers. We calculate the transmittance as a function of the electric field and compare the computed curves with the experimental data. The theoretical and experimental results are found to be in good agreement.

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Section: Discussionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Polarization-gratings approach to deformed-helix ferroelectric liquid crystals with subwavelength pitch

et al. 2011

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“…When an electric field is applied, the FLC director rotates around the z-axis with a cone angle of 2 o . When the rotation angle (z,t) is known, the light transmission level, I, can be derived accordingly [10]. The frequency dependence of the electrooptical response time can be calculated.…”

Section: Figure 2 Response Time Vs Frequency On Fixed Voltagementioning

confidence: 99%

“…However, no frequency-dependent solution is applicable to this model [10]. In this case, Fourier series are used to describe square driving signal.…”

Section: Figure 2 Response Time Vs Frequency On Fixed Voltagementioning

confidence: 99%

34.1: Deformed Helix Ferroelectric Display with Low Driving Voltage and Fast Response Time

Guo

Pozhidaev

Srivastava

et al. 2012

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In this paper, the electrooptical behavior of deformed helix ferroelectric(DHF) liquid crystals is described. Fast response with low driving voltage is obtained. One of remarkable properties of DHF mode is frequency dependence of the electrooptical response time, which is really exists in our case. Experimental and simulation results are provided with good accordance. Variable anchoring energy is realized in experiment with photosensitive alignment material SD1. For the purpose of evaluate the influence of anchoring energy on alignment quality in DHF mode, the measurement of anchoring coefficient of alignment layer for short helix pitch FLC is proposed. The contrast ratio of 13000 with switching time of 113 μs is obtained at room temperature.

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“…The deformed helix ferroelectric LCs ͑DHFLCs͒, which are special kind ferroelectric LCs ͑FLCs͒, have been found very useful as they have much applications in display devices because of their low driving voltage, gray scale generation capability, easily achievable alignment, fast response, etc. 24,25 Our group has demonstrated the nonvolatile memory effect based on GNPs doped DHFLC material ͑FLC 6304͒. 26 In the present studies, we characterized newly synthesized DHFLC material, namely LAHS19, using different experimental techniques and discussed the enhancement of luminescence intensity in GNPs doped DHFLC material on the basis of interaction of DHFLC molecules with GNPs.…”

mentioning

confidence: 99%

Enhanced photoluminescence in gold nanoparticles doped ferroelectric liquid crystals

Kumar

Prakash

Mehta

et al. 2009

Applied Physics Letters

131

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We report the characterization and photoluminescence ͑PL͒ of newly synthesized deformed helix ferroelectric liquid crystal ͑DHFLC͒ material having short pitch and high spontaneous polarization. We observed ninefold enhancement in PL intensity in gold nanoparticles doped DHFLC material. This enhancement in the PL intensity has been attributed to the coupling of localized surface plasmon resonance from metal nanoparticles with DHFLC molecules, resulting in the increase in excitation and emission rate of the liquid crystal molecules in the localized electromagnetic field. These studies would provide a cutting edge tool in the realization of enhanced photoluminescent liquid crystal display devices.

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Deformed helix ferroelectric liquid crystal display: A new electrooptic mode in ferroelectric chiral smectic C liquid crystals

Cited by 266 publications

References 14 publications

Polarization-gratings approach to deformed-helix ferroelectric liquid crystals with subwavelength pitch

Polarization-gratings approach to deformed-helix ferroelectric liquid crystals with subwavelength pitch

34.1: Deformed Helix Ferroelectric Display with Low Driving Voltage and Fast Response Time

Enhanced photoluminescence in gold nanoparticles doped ferroelectric liquid crystals

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