Surface light source device
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United States of America Patent
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Issued Date -
Sep 13, 2007
app pub date -
Mar 6, 2007
filing date -
Mar 9, 2006
priority date (Note) -
Abandoned
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Abstract
There is provided a surface light source device containing 50 ppm or less of water, 50 ppm or less of nitrogen, 30 ppm or less of oxygen, 20 ppm or less of carbon monoxide, and 20 ppm or less of carbon dioxide as impurities in its discharge space. Accordingly, the surface light source device with the impurity standards has improved brightness.
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