Patent ID: 8659537

Claim:
A backlight unit comprising: a light emitting module including a plurality of light emitting devices; a controller for controlling an operation of the light emitting module; a light guide plate disposed at one side of the light emitting module; and an optical member disposed on or under the light guide plate, wherein the light emitting module includes a first light emitting device and a second light emitting device, wherein light linearity of the first light emitting device is superior to light linearity of the second light emitting device, and a light orientation angle of the first light emitting device is smaller than a light orientation angle of the second light emitting device, and the controller selectively drives the first and second light emitting devices, wherein the plurality of light emitting modules comprises: a first and a third light emitting modules disposed in opposition to each other in a longitudinal direction, and wherein the first and the third light emitting modules include the first and the second light emitting devices, and a second and a fourth light emitting modules disposed perpendicular to the first and the third light emitting modules, wherein the second and the fourth light emitting modules include at least one of the first light emitting device and the second light emitting device, wherein an arrangement of the light emitting devices in the first and the third light emitting module is different from an arrangement of the light emitting devices in the second and fourth light emitting modules.