11.1: Invited Paper: Ferroelectric Liquid Crystals as a Material for Volumetric Displays

Abstract

Three types of electrically controlled light scattering distinguished on the physical mechanism were studied in monomeric FLC compositions at different boundary conditions and electrical pulse regimes. The total time of scattering switching on and switching off was less than 150, 250 and 500 us for different scattering types. They are rather fast to be used in a volumetric screen based on a stack of 30-100 light-scattering shutters.

Speckle‐noise suppression due to a single ferroelectric liquid‐crystal cell

“…A helix FLC with electrically controlled birefringence and light scattering [11][12][13] developed at the Lebedev Institute was used. The scheme of a cell with this FLC is shown in Fig.…”

P‐232: Ferroelectric Liquid Crystal Cell for Speckle‐Noise Suppression

“…Unusual electrooptical effects in transparent mode: bistability in thick FLC layers [1,2] and optical state multistability [2,3], as well as strong light-scattering [3] were discovered and studied. Electrically controlled (deformed) spatially inhomogeneous structures with spatial resolution of hundreds mm -1 modulating a light phase as high as a few π were found out in FLC layers [4]. Besides, developed FLC materials have a wide temperature interval and provide fast electrooptical response -from 10 to 100 μs usually, and the record is 0.5 μs for high frequency Deformed Helix Ferroelectric (DHF) mode [5].…”

Dynamic parameters of electrically controlled light scattering in helix FLC cells

“…We continue studying the electrically controlled light scattering in monomeric FLC cells which can be used as lowvoltage and fast light shutters in a volumetric screen of a 3-D display. [1][2][3] Three appropriate light-scattering effects have been observed and experimentally studied 3 ; namely, the light scattering on transient domains in the helix and helix-free FLC and the light scattering on ferroelectric domains in the helix-free FLC. All these effects arise from the spatial inhomogeneities of the optical anisotropy of the FLC layer, and no light depolarization was observed in the transparent state.…”

“…Light-scattering characteristics So, the transient scattering appears 3,4 during the reorientation of the FLC director just after changing the sign of the electric field, and scattering disappears when the formation of the homogeneous layer structure is completed at some high level of the electric field. [1][2][3] Transient domains in helix FLCs are the boundaries of spontaneous ordered regions generated in the process of nonlinear helix deformation via the electric field. They result in the appearance of refraction-index gradients along the helix axis, and this process is accompanied with light scattering of a FLC cell.…”