Patent ID: 7595847
Filing Date: 2009-09-29
Classification: G06F,H04N

Abstract:
1. An audio/video playback control system of liquid crystal display television (LCD TV), used for selectively controlling an audio signal system, an image display system and a backlight source system of an LCD TV, so as to display one of fixed images, TV or play audio signals and said control system comprising: an audio/video transmitting unit, including an audio signal processing unit for driving said audio signal system and a video processing unit for driving said image display system; an electric power system, including a standby electric power unit electrically coupled to an external electric power through a switch circuit under normal conditions and capable of powering on said system, an output electric power for driving a first electric power unit of said audio/video transmitting unit and an output electric power for driving a second electric power unit of said backlight source system, said first and second electric power units connected to said external electric power through said switch circuit; said first electric power unit being connected to said audio signal processing unit through an audio switch circuit and being connected to said video signal processing unit through a video switch circuit; an audio/video control unit and a manually controlled external control interface, and said audio/video control unit being maintained at an activated status by the power supplied by said standby electric power unit, and said audio/video control unit receives a signal transmitted from said external control interface to determine whether or not to output an activate signal to activate said audio signal processing unit and deactivate said video processing unit and said backlight source system, or activate said video processing unit and said backlight source system and deactivate said audio signal processing unit, or jointly activate said audio signal processing unit, said video processing unit and said backlight source system so as to display one of fixed images, TV or play audio signals; a power on/off circuit installed between said audio/video control unit and said electric power system, and said power on/off circuit receives said activate signal and outputs a drive signal to selectively turn on or off the first electric power unit and the second electric power unit for outputting electric power; said audio switch and said video switch being directly controlled by said activate signal of said audio/video control unit to activate or deactivate said audio and video processing units.