Liquid crystal display device and driving method thereof

A method of driving a liquid crystal display device including:

• a liquid crystal display panel configured to include a plurality of liquid crystal cell formed on regions which are defined by a plurality of gate lines and a plurality of data lines;
• and a backlight unit configured to irradiate light on the liquid crystal display panel using a plurality of light emission diode arrays each with a plurality of light emission diodes, the method comprising:
• dividing an external image data into a plurality of block image data and generating first dimming signals opposite to red, green, and blue data with each block image data;
• generating a second dimming signal opposite to a brightness data with each block image data;
• calculating a difference value between maximum and minimum grayscale values by analyzing histograms for the red, green, and blue data with each block data, deriving a gain value from the difference value, and generating a dimming mode control signal with one of different logic levels by comparing the gain value with a reference gain value;
• selecting one of the first and second dimming signals according to the dimming mode control signal;
• and
• generating driving voltages necessary to drive the plurality of light emission diodes with each of the plural light emission diode arrays, which are opposite a plural blocks, according to the selected dimming signal.

A method of driving a liquid crystal display device including:

• a liquid crystal display panel configured to include a plurality of liquid crystal cell formed on regions which are defined by a plurality of gate lines and a plurality of data lines;
• and a backlight unit configured to irradiate light on the liquid crystal display panel using a plurality of light emission diode arrays each with a plurality of light emission diodes, the method comprising:
• dividing an external image data into a plurality of block image data and generating first dimming signals opposite to red, green, and blue data with each block image data;
• generating a second dimming signal opposite to a brightness data with each block image data;
• calculating a difference value between maximum and minimum grayscale values by analyzing histograms for the red, green, and generating a dimming mode control signal with one of different logic levels by comparing the gain value with a reference difference value;
• selecting one of the first and second dimming signals according to the dimming mode control signal;
• and
• generating driving voltages necessary to drive the plurality of light emission diodes with each of the plural light emission diode arrays, which are opposite a plural blocks, according to the selected dimming signal.