| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide a backlight containing a formed birefringence reflecting polarizer. <P>SOLUTION: 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<SB>LGP</SB>and (3) a reflective polarizer, having a formed birefringence in optical contact with the LGP and is provided with a reflective polarizer, including a layer having parameters of the reflecting polarizer selected to provide R0>0.8 for one polarization state and T90>0.8 for the orthogonal polarization state, for the light wavelength of 550 nm, for at least one reflecting polarizer angle of light incidence θ<SB>a</SB>. <P>COPYRIGHT: (C)2009,JPO&INPIT |
