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Antiferroelectric liquid crystal displays

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

Opto-Electronics Review

2004

Vol. 12, No. 3

263-269

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.

Antiferroelectric and V-shape liquid crystal on silicon microdisplays

Otón J. M., Dąbrowski R., Quintana X., Urruchi V, Gayo J. L.

Opto-Electronics Review

2002

Vol. 10, No. 1

17-21

In this work, the use of antiferroelectric and V-shape liquid crystals for video projection using LCOS microdisplays has been explored. Antiferroelectric grey levels arise from a double symmetric hysteresis loop that can be stabilised by a constant holding voltage, thus an active matrix is not strictly required in this case. If used, then the voltage levels and the waveform must be adjusted to fulfil the voltage limitations dictated by the matrix. V-shape materials lack hysteresis ; therefore the active matrix is mandatory to stabilise the levels. Voltage limitations, however, are less restrictive int his case, since V-shape smectics require just a few volts for full switching.