Luminance control device, display device including the same, and method of driving the same

A luminance control device comprising:

• a coordinate generator configured to generate coordinate information for dividing a display panel of a display device into a plurality of blocks;
• a block image data generator configured to generate reference image data based on the coordinate information;
• a current sensor configured to sense a current flowing in each of the plurality of blocks;
• a block reference current calculator configured to calculate a block reference current based on a block current sensed in each of the plurality of blocks when a reference image is sequentially displayed on the plurality of blocks;
• a memory configured to store the block reference current;
• a block load calculator configured to calculate a block load of each of the plurality of blocks based on the coordinate information and input image data;
• a target current calculator configured to calculate a target current of each of the plurality of blocks based on the block reference current and the block load;
• and
• a scaling factor calculator configured to calculate a scaling factor based on the target current and a sensing current sensed in each of the plurality of blocks when an input image corresponding to the input image data is displayed on the display panel.

A method of driving a display device comprising:

• dividing a display panel into a plurality of blocks based on coordinate information;
• sequentially displaying reference images on each of the plurality of blocks;
• sensing a block current in each of the plurality of blocks;
• calculating a block reference current based on the block current;
• storing the block reference current;
• calculating a block load of each of the plurality of blocks based on the coordinate information and input image data;
• calculating a target current of each of the plurality of blocks based on the block reference current and the block load;
• displaying an input image corresponding to the input image data on the display panel;
• sensing a sensing current in each of the plurality of blocks;
• and
• calculating a scaling factor for controlling a voltage level of a data voltage corresponding to the input image data based on the sensing current and the target current.