Patent ID: 8144106

Claim:
A liquid crystal display, having a liquid crystal panel and backlights, comprising: a signal converter to convert selectively input analogue video signals into digital video signals in synchronization with a first predetermined sampling clock signal; a scaler to sample the digital video signals at a panel resolution in synchronization with a second predetermined sampling clock signal, and to extract a horizontal synchronization signal from the sampled digital video signals; a panel driver to display the digital video signals on the liquid crystal panel; a controller to detect the extracted horizontal synchronization signal from the digital video signals to determine a display mode, to output the first and second predetermined sampling clock signals to the signal converter and the scaler, respectively, according to the determined display mode, and to generate inverter on and off signals whenever the horizontal synchronization signal is transiently changed; and a backlight driver to drive the backlights in synchronization with the detected horizontal synchronization signal, the backlight driver including a pulse width modulator to generate pulse width modulation signals, which are synchronized with the horizontal synchronization signal, and to turn the pulse width modulation signals on or off according to the on and off signals generated by the controller, and a switching transformer to switch a power supply on or off according to the pulse width modulation signals, wherein enable signals for the pulse width modulator and the panel driver are synchronized with the horizontal synchronization signal extracted by the scaler, wherein the backlights comprise a radiator lamp which radiates light using the power supplied by the switching transformer, wherein when the pulse width modulation signals are turned off, the switching transformer switches a power on to the radiator lamp, whereby the radiator lamp is prevented from being disabled as a result of the display mode change.