Patent ID: 8243011

Claim:
A display device, comprising: a backlight unit that is divided into a plurality of blocks, is driven by the divided blocks, 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; and a BLU driver that controls the brightness of the blocks of the backlight unit using the local dimming values, wherein each of the plurality of optical assemblies includes: a substrate; a plurality of light sources that are positioned on the substrate and emit light; a light guide plate that comprises a light input unit including an incident surface into which light is inputted laterally from the light source 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, and wherein at least some portions of two adjacent optical assemblies among the plurality of optical assemblies overlap each other, 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, the BLU driver receives the local dimming values and outputs a plurality of driving signals, and the driving signals control the brightness of two or more blocks among the blocks of the backlight unit respectively.