Electrically controllable device having variable optical...

Details Electrically controllable device having variable optical... Electrically controllable device having variable optical...

2002-07-10

2009-02-03

Nelms, David (Department: 2871)

Liquid crystal cells, elements and systems

Liquid crystal system

Liquid crystal window

C349S086000, C359S453000, C359S460000

Reexamination Certificate

active

07486342

ABSTRACT:
The subject of the invention is an element having variable optical properties, comprising:(a) a system having electrically controlled variable light scattering, of the optical-valve or liquid-crystal system type, a suspended-particle system or a holographic or thermotropic system (a′) which is associated with(b) at least one absorbent element, absorbing at least in the visible range.It applies especially to the manufacture of backprojection screens.

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