Patent ID: 8465168
Filing Date: 2013-06-18
Classification: G02B

Abstract:
1. A lighting unit comprising: a light guide plate having a first groove and a second groove formed therein; a first light source group accommodated in the first groove; and a second light source group accommodated in the second groove; wherein the light guide plate has a first light mixing area, a first light emitting area and a second light mixing area in that order from the first groove toward the second groove; wherein, in the first light mixing area, the thickness of the light guide plate progressively increases away from the first light source group; wherein, in the second light mixing area, the thickness of the light guide plate progressively increases away from the second light source group; wherein, in the first light emitting area, the light guide plate is flat-plate-like; and wherein the first light mixing area satisfies a relation L01<L02 where L01 is a quantity of light per block area of a front surface of the light guide plate, the light leaving the front side after being emitted from the first light source group and L02 is a quantity of light per block area of the front surface of the light guide plate, the light leaving the front side after being emitted from the second light source group.