BACKLIGHT UNIT USING PARTICULAR DIRECT BACKLIGHT ASSEMBLY
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United States of America Patent
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Issued Date -
Apr 17, 2008
app pub date -
Oct 17, 2006
filing date -
Oct 17, 2006
priority date (Note) -
Abandoned
status (Latency Note)
Importance
Abstract
An illumination device comprising in order from bottom to top (a) a solid transparent light transmission plate having a bottom and top surface, and (b) a light extraction unit having a light entry and a light extraction surface separated from the transmission plate by one or more optical interfaces, said light transmission plate comprising at least one cavity/light source unit comprising a cavity containing a light source and air or other material of refractive index less than the light transmission plate, wherein the light plate includes a surface for restricting the angle at which at least some of the light from the light source leaves the cavity, wherein the light extraction unit includes (1) a light polarizer (2) a light-scatterer, or (3) a light redirector.
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