SURFACE LIGHT SOURCE DEVICE
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United States of America Patent
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Issued Date -
Mar 29, 2007
app pub date -
Sep 20, 2006
filing date -
Sep 26, 2005
priority date (Note) -
Abandoned
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Abstract
There is provided a surface light source device comprising upper and lower substrates adhered to each other in order to form a discharge space, a reflection layer and a lower fluorescent layer stacked on an upper surface of the lower substrate, and an upper fluorescent layer stacked on a lower surface of the upper substrate, wherein the reflection layer has a thickness of 40 to 120 .mu.m, the lower fluorescent layer has a thickness of 10 to 60 .mu.m, and the upper fluorescent layer has a thickness of 10 to 25 .mu.m, and the device further comprises a first ion shield layer interposed between the upper substrate and the upper fluorescent layer, for blocking Na.sup.+ ions from being eluted from the upper substrate.
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