Patent ID: 9377572
Filing Date: 2016-06-28
CPC Classification: G02B

Claim Text:
1. A backlight unit which provides light to a display panel, the backlight unit comprising: a light source which emits a first light; a light guide bar extending substantially in a first direction, wherein the light guide bar receives the first light through an incident surface thereof, and guides the first light to convert the first light to a second light; and a control pattern disposed on each of opposing side surfaces of the light guide bar, which extends in the first direction, wherein the control pattern converts the second light to a third light, and has a shape extending in the first direction to control an exit angle of the third light, wherein a shape of the control pattern disposed on one of the opposing side surfaces is substantially symmetrical to a shape of the control pattern disposed on the other of the opposing side surfaces with respect to an imaginary line crossing a center portion of the light guide bar along a thickness direction, and wherein the opposing side surfaces are not a surface parallel to the display panel.