Patent ID: 6864643

Claim:
A backlight inverter for a liquid crystal display (LCD) panel for driving a plurality of lamps in pairs, comprising: a main driving integrated circuit (IC) for generating first and second pulse width modulation (PWM) pulses in response to a dimming voltage based on a brightness control and an internally generated PWM oscillation signal, delaying the generated first and second PWM pulses by a predetermined period of time and outputting first and second PWM drive signals on a basis of the delayed first and second PWM pulses, respectively; at least one sub-driving IC for secondarily delaying said delayed first and second PWM pulses from said main driving IC by said predetermined period of time and outputting third and fourth PWM drive signals on a basis of the secondarily delayed first and second PWM pulses, respectively; and a plurality of lamp operating circuits for operating said pairs of lamps in response to said first and second PWM drive signals from said main driving IC and said third and fourth PWM drive signals from said sub-driving IC, respectively.