Patent ID: 8350800

Claim:
A display device comprising: a backlight unit that is divided into a plurality of blocks and is driven with each of the divided blocks as a unit, and includes a plurality of optical assemblies; a display panel positioned over the backlight unit; a controller that outputs local dimming values corresponding to brightness of the blocks of the backlight unit, in accordance with an image displayed in the display panel; a BLU driver that controls the brightness of the blocks of the backlight unit using the local dimming values, wherein each of the optical assemblies includes: a substrate; a plurality of light sources that are positioned on the substrate and that emit light; a light guide plate that comprises a light input unit including an incident surface into which light is inputted laterally from at least one of the light sources and a light emitting unit emitting the inputted light upward; a reflection member disposed below the light guide plate; and a side cover to which the substrate, the light guide plate and the reflection member are fixed, the side cover including a first side cover and a second side cover that are combined with each other, the first side cover being disposed above the second side cover to cover the light sources, and a part of the second side cover being inclined on the bottom of the light guide plate, wherein the light guide plate includes: a first part having the incident surface, the first part projecting from a lower portion of a side of the light guide plate; and at least one projection disposed between the light sources and projecting from a top of the first part by a predetermined height for being caught by the first side cover, wherein the backlight unit includes a plurality of substrates which are separated to correspond to the plurality of optical assemblies, wherein the plurality of optical assemblies are respectively fixed to a bottom cover of a display module by using the side cover included in each of the optical assemblies, wherein the BLU driver receives the local dimming values and outputs a plurality of driving signals, and wherein the blocks of the backlight unit are divided into a plurality of scan groups and are driven with each of the divided scan groups as a unit.