Photo-aligned ferroelectric liquid crystal displays based on azo-dye layers

Liquid‐crystal photoaligning by azo dyes (Invited Paper)

“…The photoaligned FLC cell appeared to be better than being prepared by buffing, if the UV irradiation time of the azo-dye layer is high enough. 7,[18][19][20] The FLC row-addressing response time of τ ≈ 100 µsec at a voltage pulse amplitude of U = ±15 V was demonstrated. 19 Large FLC cell gaps of 5 and 7 µm was used.…”

“…7). 19 Recently, a photoaligned bistable FLC with dichromatic (two color) 21 and almost achromatic (black/white) 18,22 switching were realized ( Fig. 7).…”

Electrically controlled birefringence colours in deformed helix ferroelectric liquid crystals

“…The light intensity irradiated on the surface of the film was 3 mW cm 22 for polarised light. The best FLC alignment quality was obtained under asymmetric boundary conditions (24)(25)(26), when only one ITO surface of FLC cells was prepared with the SD-1 layer, whereas another ITO surface was simply washed with DMF and covered with 5 mm diameter calibrated spacers. Thus, after assembling the FLC cells, the asymmetric boundary conditions of the FLC layer were obtained (see Figure 5).…”

27.1: Invited Paper: New Developments in Liquid Crystal Photo-Aligning by Azo-Dyes

“…The photo-aligned FLC cell appeared to be better than prepared by buffing, if the UV-irradiation time of the azo-dye layer is high enough [27]. The FLC row addressing response time of τ ≈ 100 μs at the voltage pulse amplitude of U= ±15V was demonstrated [27,28]. Large FLC cell gaps of 5 μm and 7 μm were used, which is easy in manufacturing.…”