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Video-rate multiplexed driving scheme for passive antiferroelectric liquid crystal displays

Quintana X., Castillo P. L., Otón J. M., Bennis N., Lara A., Urruchi V., Dąbrowski R.

Opto-Electronics Review

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2004

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Vol. 12, No. 3

291-297

EN

Antiferroelectric liquid crystals have been applied to high-end multiplexed displays. The interest on these materials chiefly comes up from their capability of being multiplex addressed with no need of active matrices. Antiferroelectric grey levels arise from a double symmetric hysteresis loop that can be stabilized by a constant holding voltage. Driving schemes are compatible with passive multiplexing, but limitations appear when the multiplexing rate increases. To avoid these limitations, new driving schemes for high multiplexing level at video rate have been designed. The problem of accumulated voltage on bias level arising from data voltages is tackled as well.

2

Antiferroelectric liquid crystal displays

Otón J. M., Quintana X., Castillo P. L., Lara A., Urruchi V., Bennis N.

Opto-Electronics Review

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2004

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Vol. 12, No. 3

263-269

EN

In the last few years, the unique features of antiferroelectric liquid crystals (AFLCs) have been explored to develop high-end displays. A number of passive- and active-matrix prototypes have been presented. However, although their use in a number of application areas has been suggested, no commercial products have been announced yet. This work reviews the state of the art of AFLC displays, the reasons for their present low incidence in display markets, and the latest developments aiming to overcome the main shortcomings that hinder their development. V-shape smectic displays are also included in this study. Although not considered strictly antiferroelectrics nowadays, V-shape materials behaviour and scope are similar to traditional AFLCs.

3

Modelowanie układów elektromechanicznych za pomocą Verilog-A

Lara A., Lemaitre L.

Elektronika : konstrukcje, technologie, zastosowania

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2004

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Vol. 45, nr 2

19-22

PL

Artykuł prezentuje przykład użycia Verilog - AMS do modelowania systemu elektromechanicznego. Pierwsze rozdziały przedstawiają system elektromechaniczny w kontekście właściwości fizycznych i obliczeniowych. Następne prezentują przegląd metod modelowania systemu elektromechanicznego. Jako przykład został zaprezentowany prosty model silnika prądu stałego w języku Verilog - AMS.

EN

This paper presents an example of use of Verilog - AMS for modelling of electro - mechanical system. First section describe electro - mechanical system in term of main physical and computational charcteristics. Next sections provide an overview of various modelling techniques employed for modelling of electro - mechanical systems. As an example a dc-motor model written in Verilog - AMS is shown