Patent ID: 7095633
Filing Date: 2006-08-22
Classification: G09G,H02M,Y02B

Abstract:
1. A power supply system of a display apparatus comprising: a DC converter to convert an AC voltage into a DC voltage; a Pulse Width Modulator to generate a Pulse Width Modulation (PWM) signal; a transformer to receive the DC voltage of the DC converter, and to output an AC voltage according to the Pulse Width Modulation signal from the Pulse Width Modulator; an output circuit to smooth the AC voltage from the transformer and supply the smoothed AC voltage to various components; a sync signal supplier to generate a sync signal having a frequency equal to a frequency of a horizontal sync signal, the horizontal sync signal being externally input, to generate the Pulse Width Modulation signal synchronized to the horizontal sync signal and to supply the sync signal to the Pulse Width Modulator; and a controller to determine a power saving mode depending on whether the horizontal sync signal and/or a vertical sync signal is externally input, and to control the sync signal supplier by outputting a power saving mode signal and a clamp signal, generated according to the input horizontal sync signal, to the sync signal supplier to supply power according to the determined power saving mode.