Patent ID: 6839048

Claim:
A liquid crystal display (LCD) comprising: an LCD panel comprising a plurality of gate lines, a plurality of data lines, switches connected to the gate lines and data lines, and pixel electrodes connected to the switches and being responsive to operations of the switches; a scan driver to sequentially output scan signals to the gate lines; a data driver to output image signals to the data lines; an inverter to output a predetermined backlight driving voltage; a backlight unit arranged on a rear portion of the LCD panel to output predetermined rays when a backlight driving voltage is supplied; and a timing controller receiving image signals and timing signals, converting them into signals for outputs of the image signals and scan signals, respectively outputting them to the data driver and the scan driver, checking the image signals, and controlling the inverter such that luminance of the backlight unit is varied depending on the gray voltage levels of the image signals when the image signals represent moving pictures so as to increase or decrease luminance levels of the LCD panel and the luminance of the backlight unit is maintained when the image signals represent.