Patent ID: 6091459
Filing Date: 2000-07-18
Classification: H04N

Abstract:
An OSD (On-Screen-Display) circuit having a command processor for decoding control commands into display control data, and a character generator, the character generator circuit operating synchronously with a vertical synchronous signal and a horizontal synchronous signal of a video picture and generating three color signals for displaying OSD information on the video picture and a blanking signal for suppressing signals of parts of the video picture where the OSD information is displayed, said OSD circuit further comprising:a background color control circuit whichoutputs, when a background control signal supplied from the command processor is inactive, the three color signals and the blanking signal generated by the character generator, wherein said background control signal is made active when the video picture is to be replaced with a background color, andoutputs the three color signals generated by the character generator, when the blanking signal is active, and a background color signal for displaying said background color when the blanking signal is inactive, andoutputs, when said background control signal is active, instead of the blanking signal a background blanking signal produced in response to the vertical synchronous signal and the horizontal synchronous signal and the background control signal for suppressing signals of all of the video picture.