Patent ID: 8330708

Claim:
A display device, comprising: a backlight unit that is divided into a plurality of blocks and is driven by the divided blocks, and includes at least one optical assembly; 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 the at least one optical assembly includes: a first layer; a plurality of light sources formed on the first layer to emit light, and each light source's light emitting surface being vertical to the first layer, wherein the light sources include at least one first light source and at least one second light source which are arranged in different rows, and a light emitting direction of the at least one first light source and a light emitting direction of the at least one second light source are in opposite directions based on the different rows; a second layer disposed above the first layer to cover the light sources; and a reflective layer that is disposed between the first and second layers, and wherein the BLU driver receives the local dimming values and outputs a plurality of driving signals, and the blocks of the backlight unit are divided into a plurality of scan groups and are driven by the divided scan groups.