Patent ID: 7825892

Claim:
A backlight driving signal generator for receiving a control signal from a micro controller to control a backlight driving circuit of a liquid crystal display (LCD), the backlight driving signal generator comprising: a first pulse width modulation unit for generating a first pulse signal; and a second pulse width modulation unit for generating a second pulse signal; wherein the backlight driving signal generator transmits the first pulse signal and the second pulse signal to the backlight driving circuit, the backlight driving signal is capable of driving a cold cathode fluorescent lamp when receiving the control signal from said micro controller to alternate both the first pulse signal and the second pulse signal at a first high-voltage level and a first low-voltage level, the backlight driving signal generator is capable of driving a light emitting diode when receiving the control signal from said micro controller to alternate the first pulse signal at a second high-voltage level and a second low-voltage level, and to utilize the second pulse signal as a switching signal; and wherein the backlight driving circuit is coupled to a backlight unit, and the backlight unit provides a connection for only cold cathode fluorescent lamp operation or only light emitting diode operation as mutually exclusive light sources.