Drive state displaing apparatus and method for backlight unit in liquid crystal display device

The present invention relates to a technology for indicating whether the external extent that normally is driven by checking the drive state of the lamp for a backlight of a liquid crystal display device, the normal driving is impossible. The present invention is converted into an AC voltage of a predetermined DC voltage level input to the inverter output to the backlight lamp and; And the drive current detection unit for detecting the driving voltage supplied to the backlight lamp from the inverter and detecting the driving voltage detector, the tube current of the lamp for the back light to output a detection signal according to output a detection signal corresponding thereto; On the basis of the two detected signals drive voltage to check by outputting a driving status signal for showing the box and, at the same time, the driving state to limit the drive voltage output from the inverter on the basis of the check result of the driving state for the backlight lamp control and drive status signal output unit; The Value for the backlight lamp is achieved by a lamp drive state notification unit notifying that are driven into a state in accordance with the driving status signal. Backlight, shutdown, and protective circuit