Patent ID: 8022638
Filing Date: 2011-09-20
Classification: H05B

Abstract:
1. A liquid crystal display (LCD) backlight inverter comprising: a lamp open detection unit outputting a first open detection voltage for a preset time period when it is determined that a predetermined lamp is open, based on a current voltage corresponding to a current of the predetermined lamp of a plurality of lamps, and outputting a normal voltage after the preset time period; a first open determination unit outputting an open detection signal when the first open detection voltage is input from the lamp open detection unit; a second open determination unit outputting a protection signal when it is determined that all of the plurality of lamps are open based on a second open detection voltage input via a common node connected in common to respective detection voltage terminals of the plurality of lamps; a temporary protection determination unit outputting a frequency change signal when both the open detection signal and the protection signal are input from the first open determination unit and the second open determination unit respectively; and an operating frequency control unit changing an operating frequency to a preset protective frequency according to the frequency change signal from the temporary protection determination unit.