Electro-optic performance

In addition to the sensitivity to ring structure, slight alterations of the hydrocarbon chain may lead to dramatic differences in electro-optic performance in chiral compounds [43]. For example, in some electroclinic Sm-A materials it has been reported that if the chain is shortened or if a double bond is localised at the end of the hydrocarbon chain, the tilt angle, electroclinic coefficient, and switching time are significantly suppressed [43]. 

This study examines the effects of the polymerization conditions on the electro-optic performance of PSFLCs, and the influence of the LC ordering on the polymerization behavior of various monomers is discussed. Basic electro-optic proper-... 

Lee M, Hur S-T, Higuchi H, Song K, Choi S-W, Kikuchi H (2010) Liquid crystalline blue phase I observed for a bent-core molecule and its electro-optical performance. J Mater Chem... 

Temperature Dependence of Electro-optical Performance of STN-LCDs... 

Table 5.2 Configuration and typical electro-optical performance of an early bilayer OLED using the low-molar-mass diamine (2) as HTL and Alqj (3) as the ETL and emission layer ...

Table 6.18 Configuration and electro-optical performance of a prototype OLED for backlighting using a soluble PPV derivative as the emission layer ...

At the present time, as shown by the pocket calculator, materials are available with adequate electro-optic performance where the duty cycle is 1 in 2, 3 or 4. Where temperature compensation is used, 1 in 7 duty cycle is possible O with mixtures of cyanobiphenyls and benzoate esters. For a duty cycle of 1 in 10, temperature compensation is a must and the electro-optic performance is determined principally by the threshold sharpness. By way of example. Fig. 36 shows a viewing cone plot for ZLl 1253 (dotted line curves) compared with a sharper threshold material (1.65) (solid line curves) in an 8y, low tilt cell. By single frequency addressing, a 1 in 10 duty cycle is approaching the maximum for an acceptable performance in a twisted nematic display. 

The reorientation of liquid crystals in an external electric field is the basis of their technical application in liquid-crystal displays (LCDs) and has been treated in numerous books and reviews [1-3, 12, 38, 46 50]. This section is intended to demonstrate the application of time-resolved FTIR spectroscopy for a better understanding of the electro-optical performance of liquid-crystalline systems. Due to the reversible character of the orientational and relaxational motions of liquid crystals under the perturbation of an electric field, the time-resolution of the FTIR measurements can be extended down to the microsecond range by the implementation of the step-scan technique (see Section 2.2). Thus, an insight on a molecular level... 

I. Dierking, L.L. Kosbar, A.C. Lowe, and G.A. Held, Polymer network structure and electro-optic performance of polymer stabilized cholesteric textures I. The influence of curing temperature, Liq. Cryst. 24, 387 395 (1998). 

Electro-optical Performance of Supertwisted Nematic Displays.213... 

A. Ashford, J. Constant, J. Kirton, and E. P. Raynes. Electro-Optic Performance of a New Room-Temperature Nematic Liquid Crystal, Electron. Lett., Vol. 9, p. 118 (1973). 

Lomheim et al. (1998) Experimental Characterization, Evaluation, and Diagnosis of Advanced Hybrid Infrared Focal Plane Array Electro-Optical Performance by T. S. Lomheim, L. W. Schumann, and S. E. Kohn, SPIE 2279-2258, Orlando FL, April 1998. Stierwalt and Eisenman (1978) Problems in Using Cold Spectral Filters with LWIR Detectors by D. L. Stierwalt and W. L. Eisenman, Proc. SPIE 132, 134. 

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