High-speed liquid-crystal modulators using transient nematic effect

Wu, Shin‐Tson; Wu, Chiung‐Sheng

doi:10.1063/1.343135

Cited by 108 publications

(31 citation statements)

References 20 publications

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“…For example, if the application is at room temperature, then from Fig. 3(a) the estimated response time would be slower than that at 50 C. To shorten response time, overdrive and undershoot voltage method can be applied [25], [26]. On the other hand, if the operation temperature exceeds 70 C, then the birefringence decreases noticeably as Fig.…”

Section: Simulation Results For Va Lcosmentioning

confidence: 95%

Submillisecond-Response Vertical-Aligned Liquid Crystal for Color Sequential Projection Displays

Chen

Peng

2013

J. Display Technol.

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We developed a fluorinated, UV-stable, high birefringence and low viscosity liquid crystal mixture for projection displays. With this mixture in a thin-cell-gap LCOS, we can achieve submillisecond gray-to-gray response time at an elevated temperature, which enables color sequential projection displays with negligible color breakup.Index Terms-Color breakup, liquid crystal on silicon (LCOS), projection.

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Section: Simulation Results For Va Lcosmentioning

confidence: 95%

Submillisecond-Response Vertical-Aligned Liquid Crystal for Color Sequential Projection Displays

Chen

Peng

2013

J. Display Technol.

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“…To further improve the PSDFLC VOA's response time, one could use the overdrive voltage method 15,16 or use a high-birefringence, low-viscosity DFLC mixture. The overdrive method is used to shorten the rise time by applying a short but high voltage to kick the LC molecules to the desired tilt angle, whereas the undershoot method is particularly useful for reducing the gray-scale response time.…”

Section: Discussionmentioning

confidence: 99%

Variable optical attenuator with a polymer-stabilized dual-frequency liquid crystal

Liang

et al. 2005

Appl. Opt.

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A transmission-type variable optical attenuator (VOA) based on a polymer-stabilized dual-frequency liquid crystal (PSDFLC) is demonstrated at ϭ 1.55 m. The VOA is highly transparent in the voltageoff state but scatters light in the voltage-on state. By using a birefringent beam displacer incorporated with half-wave plates, we can obtain a VOA that is polarization independent and that exhibits a 31 dB dynamic range. The polymer networks and dual-frequency effect together reduce the response time (rise ϩ decay) of a 16 m PSDFLC cell to 30 ms at room temperature and at a voltage of 24 V rms .

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“…Therefore, it is possible to dynamically control the thermal conductivity or thermal diffusivity by varying the orientational alignment of molecules just as in the case of the optical switch. Fast anisotropic variations in heat conduction can be expected because the orientational response time of a typical nematic liquid crystalline molecule is of the order of milliseconds [4,5]. Therefore, it can be assumed that liquid crystals are good candidates to confirm the potential for novel control devices of anisotropic heat conduction.…”

Section: Introductionmentioning

confidence: 99%

Real-Time Sensing of the Thermal Diffusivity for Dynamic Control of Anisotropic Heat Conduction of Liquid Crystals

Motosuke

Nagasaka

2008

Int J Thermophys

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Molecular orientational order can be used to characterize the anisotropic behavior in mechanical, optical, and thermophysical properties. The creation of appropriate molecular orientation has the potential for producing a novel material or thermal switching device, which can control anisotropic heat conduction. Liquid crystals, which are widely used in display elements, have anisotropy not only in their optical, but also in their thermophysical properties, under given molecular orientational alignment conditions; this material can be a variable device with anisotropic heat conduction by controlling the molecular alignment. In the present study, a real-time sensing system for thermal diffusivity using the forced Rayleigh scattering (FRS) method was developed to investigate the transient behavior in the thermal anisotropy of nematic liquid crystals. This technique can be used to measure the in-plane thermal diffusivity perpendicular to the transient thermal grating created by interfering pulsed laser beams, and the thermal anisotropy of the sample can be determined using this non-contact method. The present FRS system can provide continuous measurements of the thermal diffusivity with subsecond time resolution, allowing evaluation of the dynamic behavior of anisotropy in the thermal diffusivity even during a transient process. In this article, the anisotropy of the in-plane thermal diffusivity of 4-4 -pentyl-4-biphenylcarbonitrile (5CB) with molecular alignment induced by either a rubbed substrate or an electric field has been measured. Also, the time evolution of the anisotropic thermal diffusivity in real-time under a dynamically controlled external elec-M. Motosuke (B) tric field has been measured. The experimental results demonstrate the capability of dynamic anisotropic control of heat conduction by molecular alignment variations.

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High-speed liquid-crystal modulators using transient nematic effect

Cited by 108 publications

References 20 publications

Submillisecond-Response Vertical-Aligned Liquid Crystal for Color Sequential Projection Displays

Submillisecond-Response Vertical-Aligned Liquid Crystal for Color Sequential Projection Displays

Variable optical attenuator with a polymer-stabilized dual-frequency liquid crystal

Real-Time Sensing of the Thermal Diffusivity for Dynamic Control of Anisotropic Heat Conduction of Liquid Crystals

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