Optical: systems and elements – Holographic system or element – Using a hologram as an optical element
Patent
1990-07-25
1995-05-23
Gross, Anita Pellman
Optical: systems and elements
Holographic system or element
Using a hologram as an optical element
345 97, G02F 11343
Patent
active
054186340
ABSTRACT:
A driving method for an optical modulation device is applicable to driving of an optical modulation device, e.g., a liquid crystal device having a matrix electrode arrangement comprising a group of scanning electrodes, a group of signal electrodes oppositely paced from the group of scanning electrodes, and an optical modulation materials showing bistability with respect to an electric field applied thereto disposed between the groups of scanning electrodes and signal electrodes. The driving method is featured by applying a voltage allowing the liquid crystal having bistability to be oriented to a first stable state between a selected scanning electrode of the group of scanning electrodes and a selected signal electrode of the group of signal electrodes, and by applying a voltage allowing the liquid crystal having bistability to be oriented to a second stable state between the selected scanning electrodes and non-selected signal electrodes; or by applying a voltage allowing the optical modulation material having bistability to be oriented to a first stable state between a selected scanning electrode and the group of signal electrodes, applying a voltage allowing the liquid crystal oriented to the first stable state to be oriented to a second stable state between the selected scanning electrode and a selected signal electrode, and applying a voltage set to a value between a threshold voltage -V.sub.th2 (for the second stable state) and a threshold voltage V.sub.th1 (for the first stable state) between non-selected scanning electrodes and the group of signal electrodes.
REFERENCES:
patent: 4850676 (1989-07-01), Yazaki et al.
Kanbe Junichiro
Kaneko Syuzo
Katagiri Kazuharu
Canon Kabushiki Kaisha
Gross Anita Pellman
Mai Huy
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