Patent ID: 8018424

Claim:
A backlight unit for use in a liquid crystal display, comprising: (a) a substrate defining an edge zone and a central zone surrounded by the edge zone; (b) a plurality of first light emitting elements positioned in the central zone of the substrate, each of the first light emitting element comprising a red light LED chip, a green light LED chip, and a blue light LED chip characterized by chip areas L RC , L GC , and L BC , respectively; and (c) a plurality of second light emitting elements positioned in the edge zone of the substrate, each of the second light emitting element comprising a red light LED chip, a green light LED chip, and a blue light LED chip characterized by chip areas L RE , L GE , and L BE , respectively, wherein at least one of the following relations is satisfied: the chip areas L RE of the red light LED chip in each of the second light emitting elements is less than the chip areas L RC of the red light chip in each of the first light emitting elements; the chip areas L GE of the green light LED chip in each of the second light emitting elements is less than the chip areas L GC of the green light chip in each of the first light emitting elements; and the chip areas L BE of the blue light chip in each of the second light emitting elements is less than the chip areas L BC of the blue light chip in each of the first light emitting elements.