Patent ID: 8337066

Claim:
A backlight module comprising: a light guide plate comprising a plurality of first troughs on a first side and a plurality of second troughs on a second side opposite to the first side; a first light module comprising a first substrate and a plurality of first light emitting diodes disposed on the first substrate, wherein an opaque element disposed on each first gap between the two adjacent first light emitting diodes, each first light emitting diode is correspondingly embedded in one of the plurality of first troughs; a second light module comprising a second substrate and a plurality of second light emitting diodes disposed on the second substrate, wherein an opaque element disposed on each second gap between the two adjacent second light emitting diodes, each second light emitting diode is correspondingly embedded in one of the plurality of second troughs; wherein each first light emitting diode is disposed in an alignment to one of the second gaps, each second light emitting diode is disposed in an alignment to one of the first gaps, and the first light emitting diodes and the second light emitting diodes are arranged asymmetrically.