| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide a planar lighting device which attains both reduced thickness and power saving, and has excellent luminance uniformity in a partial drive system such as local dimming. <P>SOLUTION: The planar lighting device includes: a plurality of light sources, and at least two or more light guide layers disposed on the emitting side of the light sources, each of the light guide layers having a refractive index which is not one. <P>COPYRIGHT: (C)2011,JPO&INPIT |
