Patent ID: 8581942
Filing Date: 2013-11-12
Classification: G02B,G02F

Abstract:
1. A backlight unit for a liquid crystal display device, comprising: a reflection plate; a light guide plate over the reflection plate, the light guide plate having n grooves at a lower surface of the light guide plate and including (n+1) areas divided by the grooves, wherein n is a natural number; a first LED assembly disposed at a first side surface of the light guide plate, the first LED assembly including (n+1) LED packages, each of which has at least one LED, wherein the LED packages of the first LED assembly correspond to the (n+1) areas, respectively, and are separately driven; and a plurality of optical sheets over the light guide plate, wherein the light guide plate includes patterns at the lower surface, and wherein the patterns have high density according as it approaches a central portion of the light guide plate or according as it approaches a central portion in each of the areas of the light guide plate.