To uniformalize light emission with luminance variations being suppressed and to improve an efficiency of use of light.
Light p1 having an angle smaller than a critical angle with respect to a notch surface 2c of a collimator 2, of incident light incident upon the collimator 2 from a light source block 4, passes through a first boundary layer 11 to be incident upon a light guide plate 3. Light p2 having an angle equal to or greater than the critical angle with respect to the notch surface 2c, of the light incident upon the collimator 2 from the light source 4, is totally reflected by the first boundary layer 11. Third light p3 having an angle smaller than a predetermined angle with respect to the first boundary layer 11, of the totally reflected second light p2, is directly reflected on a reflection surface 2a of the collimator 2. Fourth light p4 having an angle equal to or greater than the predetermined angle, of the second light p2, is incident at a critical angle or greater angle with respect to a second boundary layer 12, reflected on the second boundary layer 12, and then reflected on the reflection surface 2a of the collimator 2. Because the shapes of respective parts influencing light guiding are designed in such a manner, light incident upon a light guide plate 10 is collimated as much as possible.
KIMURA AKIRA
NAGUMO TSUTOMU
| JP2004192937A | 2004-07-08 | |||
| JP2002169034A | 2002-06-14 | |||
| JP2004165124A | 2004-06-10 | |||
| JP2002250820A | 2002-09-06 | |||
| JP2006147581A | 2006-06-08 |
Ori Akira
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