Backlight containing formed birefringence reflective polarizer
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United States of America Patent
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Nov 17, 2009
Grant Date -
Dec 11, 2008
app pub date -
Jun 11, 2007
filing date -
Jun 11, 2007
priority date (Note) -
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Abstract
A backlight unit comprises: (1) a light source; (2) a light guide plate (LGP) having an incident face toward the light source and having a refractive index n.sub.LGP; (3) a reflective polarizer having formed birefringence in optical contact with the LGP including a layer having parameters of the reflective polarizer selected to provide R0>0.8 for one polarization state and T90>0.8 for the orthogonal polarization state, for light of wavelength of 550 nm, for least one reflective polarizer angle of light incidence .theta..sub.a.
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