Display device and driving method thereof

A display device comprising:

• a display panel which displays an image;
• a light source unit which provides light to the display panel;
• and
• a light source controller which transmit a control signal to the light source unit,
• wherein the light source unit includes a light source including a plurality of light emission blocks,
• wherein the light source controller includes:
• a first reference determining unit which determines first references for the plurality of the light emission blocks based on an input image signal,
• a reference difference calculator which calculates at least one reference difference for neighboring light emission blocks by using first references for corresponding neighboring light emission blocks,
• a parameter generator which generates at least one parameter by using the at least one reference difference, and
• a second reference determining unit which determines a second reference for a corresponding light emission block by using the first references for the plurality of light emission blocks and the at least one parameter, and
• wherein
• the at least one reference difference is determined as an absolute value of a difference between the first references of the neighboring light emission blocks, or an n square (n is a natural number larger than 1) of the difference between the first references of the neighboring light emission blocks.