Display apparatus and method for adjusting brightness thereof

A method for adjusting brightness of a display apparatus comprising a panel unit which displays a video signal, and a light emitting unit which provides the panel unit with a ray of light and causes the video signal to be visualized, the method comprising:

• controlling the light emitting unit so that the ray of light is provided to each of local areas of the panel unit;
• and
• compensating pixels of the video signal in each of the local areas of the panel, to remove an artifact which is generated due to the ray of light provided to local areas of the panel unit, and
• adjusting the brightness values (LLD) of an entire screen for compensating a brightness variation using the compensated pixels of the video signal,
• wherein the controlling the light emitting unit comprises:
• controlling the light emitting unit to adjust brightness of each of the local areas of the panel by using the brightness values, and
• controlling the light emitting unit to adjust overall brightness of the panel at a same ratio by adjusting the brightness of each of the local areas of the panel at the same ratio using representative values of the local areas that are computed by the local brightness adjusting unit and the compensated pixels.