Display device and backlight driving method thereof

A display device comprising:

• a display panel comprising a plurality of pixel units and divided into a plurality of display areas;
• an image processing circuit receiving input image data and generating a plurality of control signals according to the input image data;
• a backlight controller receiving the plurality of control signals from the image processing circuit and generating a plurality of driving signals according to the plurality of received control signals respectively;
• and
• a light source module comprising a plurality of light source units corresponding to the plurality of display areas respectively, wherein the plurality of light source units are controlled respectively by the plurality of driving signals to emit light;
• wherein each pixel unit comprises a first color brightness gain and a second color brightness gain, and the input image data comprises the first color brightness gains and the second color brightness gains of the plurality of pixel units,
• wherein for each of the plurality of display areas, the image processing circuit obtains an estimated current according to a sum of the first color brightness gains and the second color brightness gains of the pixel units in the display area,
• wherein the image processing circuit decides an adjustment factor according to a sum of the estimated currents of all of the plurality of display areas, and
• wherein when the backlight controller operates in a high brightness mode, the image processing circuit changes the plurality of control signals according to the adjustment factor, such that the backlight controller adjusts the plurality of driving signals according to the plurality of changed control signals.