C - Chemistry – Metallurgy – 09 – K
Patent
C - Chemistry, Metallurgy
09
K
345/8
C09K 19/02 (2006.01) C09K 19/58 (2006.01) G02F 1/13 (2006.01) G02F 1/141 (2006.01)
Patent
CA 2019652
ABSTRACT OF THE DISCLOSURE HOE 89/F 197 Ferroelectric liquid crystal components having a high spontaneous polarization and a small helical pitch Liquid crystal materials are becoming increasingly important in electro-optical switching and display devices. During recent times, ferroelectric liquid crystal mixtures have also been investigated to a particularly great extent and used in displays. A physical quantity which is particularly important for the purpose of describing FLC mixtures is the spontaneous polarization (Ps). On the one hand, a high spontaneous polarization leads to short switching times, while on the other hand in the case of high Ps values an optical hysteresis occurs, which leads, inter alia, to so-called "ghost images". In spite of high spontaneous polarization, the problem of the optical hysteresis may be overcome by the use of FLC mixtures having a high spontaneous polarization (Ps 20 nC/cm2) and a natural helical pitch of less than one half of the layer thickness in an SSFLC display with a layer thickness of 1 to 10 µm. FLC mixtures with Ps > 40 nC/cm2 can also be switched under these conditions.
Escher Claus
Harada Takamasa
Hemmerling Wolfgang
Illian Gerhard
Murakami Mikio
Fetherstonhaugh & Co.
Hoechst Aktiengesellschaft
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