Video display apparatus having an on-screen display and method for controlling position thereof

An apparatus for displaying a representation of adjustment data on a video display of a multi-frequency video display apparatus, comprising:

• a microcomputer;
• an input unit for receiving adjustment data for said video display apparatus, said input unit connected to said microcomputer;
• an input terminal for receiving an input video signal having one of a plurality of different horizonal frequencies for display on said video display;
• a deflection synchronization circuit;
• a synchronization signal separating circuit connected to said input terminal for separating a synchronization signal from said input video signal, said synchronization signal fed to said microcomputer and to said deflection synchronization circuit;
• an on-screen display circuit for generating an on-screen display video signal representing said adjustment data;
• a video circuit for generating an added video signal by adding said input video signal to said on-screen display video signal and feeding said added video signal to said video display, thereby displaying said added video signal, wherein
• said deflection synchronization circuit is connected to said video display for synchronizing said added video signal so that said representation of said adjustment data is displayed at a substantially constant position on said video display;
• and
• a bus for connecting said microcomputer to said video circuit, said on-screen display, and said deflection synchronization circuit, wherein
• said microcomputer controls a position of said representation of said adjustment data by calculating and outputting compensation data to said bus based on at least said adjustment data and said synchronization signal.

A method for displaying a representation of adjustment data on a video display screen of a multi-frequency video display apparatus having as an input one of a plurality of video signals having respective synchronization signals of various frequencies, comprising the steps of:

• detecting a synchronization signal frequency of the input signal;
• detecting a position of a raster on said screen;
• obtaining position data for said representation on said video display screen from the detected position of said raster;
• and
• displaying said representation on said video display screen based on said position data.

A method for displaying a representation of adjustment data on a video display screen of a multi-frequency video display apparatus having as an input one of a plurality of video signals having respective synchronization signals of various frequencies, comprising the steps of:

• detecting a horizontal synchronization signal frequency of the input signal;
• detecting a position of a raster on said screen corresponding to the horizontal synchronization signal;
• obtaining position data for said representation on said video display screen from the detected position of said raster;
• calculating compensation data for said position data based on the detected position of said raster;
• and
• controlling the position of said representation on said video display screen based on said compensation data, thereby displaying said representation of adjustment data at a substantially constant position on said video display screen.