Video input level control circuit in a video appliance

摘要: A video input level control circuit in a display device which can improve picture quality of the appliance by selectively controlling levels signals inputted different manners from different-typed cards PC so that may be minimal. The includes signal output section for signal-processing an RGB computer, processing detecting whether vertical and horizontal synchronous frequency are generating signal, on-screen (OSD) connected to outputting receiving constrast according section, contrast operable voltage adjust brightness screen outputted amplifier OSD amplifying section.