Apparatus for producing an optical effect or for simulating fires and simulated fireplaces including such apparatus
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United States of America Patent
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Jan 26, 2010
Grant Date -
Feb 14, 2008
app pub date -
Oct 13, 2005
filing date -
Oct 13, 2004
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
Apparatus for producing an optical effect includes a screen comprising at least one electroluminescent material and associated electrodes for exciting the electroluminescent material to emit light. The electrodes are locally excitable so that the regions of the electroluminescent material generally in the shape of flames may be excited. In an alternative form, or additionally, the screen comprises a material of variable opacity such as a liquid crystal polymer or a suspended particle device gain, electrodes are locally excitable to locally change the opacity of the screen. The screen is locally illuminated to provide the impression of flames.
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