Apparatus and method of driving liquid crystal display device

A driving apparatus of an LCD device, having an LCD panel, a data driver, a gate driver, and a backlight that provides a light to the LCD panel, comprising:

• a picture quality improving unit that is configurable to:
• generate a histogram representing brightness components of input first data by levels;
• generate second data comprising an extended contrast ratio related to a brightness of the histogram by levels using a backlight weight input from an external source, and the brightness of histogram by levels;
• and
• generate at least one brightness control signal according to a calculated value of the histogram;
• a timing controller that supplies the second data, and controls the data driver and the gate driver;
• and
• an inverter that drives the backlight based on the brightness control signal.

A driving method of an LCD device having an LCD panel that displays an image corresponding to a data signal, a data driver that supplies the data signal to the LCD panel, and a gate driver that supplies a scan signal to the LCD panel, comprising:

• generating a histogram by dividing brightness components of input first data into levels, and generating second data having an extended contrast ratio related to a brightness of the histogram by levels using a calculated value of the histogram;
• arranging the second data;
• and
• supplying the arranged second data to the data driver.

A driving method of an LCD device comprising an LCD panel that displays an image corresponding to a data signal, a data driver that supplies the data signal to the LCD panel, and a gate driver that supplies a scan signal to the LCD panel, comprising:

• generating a histogram by dividing brightness components of input first data into levels, and generating second data comprising an extended contrast ratio related to a brightness of the histogram by levels using a backlight weight input from the external source;
• arranging the second data;
• and
• supplying the arranged second data to the data driver.