Display control system

A display control system comprising:

• a display control unit including:
• (a) a display control circuit means for outputting a display position signal, a video signal, a vertical synchronzing signal and a horizontal synchronizing signal;
• and
• (b) a combining circuit means for receiving the video signal, the vertical synchronizing signal and the display position signal and for outputting a composite video signal, the composite video signal corresponding to the video signal when the vertical synchronizing signal is in a display period, the composite video signal corresponding to the display position signal when the vertical synchronizing signal is in a blanking period;
• and
• a display unit including a video control circuit means, a vertical deflection circuit means and a horizontal deflection circuit means, said display unit for conducting a display on a display means, said display unit further including:
• (a) separating means for receiving the composite video signal and for separating the composite video signal into a reproduced video signal during the display period of the vertical synchronizing signal and into a reproduced display position signal during the blanking period of the vertical synchronizing signal;
• (b) means for coupling the separating means to the display such that the reproduced display signal is sourced to the display means and displayed thereon to form the image;
• (c) a horizontal timing detection circuit means for receiving and detecting a difference in phase between said reproduced display position signal and said horizontal synchronizing signal, and for outputting a timing adjusting signal for said horizontal synchronizing signal to said horizontal deflection circuit means such that an image to be displayed is centered on the display means.

A display control method of adjusting the position of an image displayed on a display, comprising the steps of:

• (a) generating a composite video signal by combining a video signal obtained during a display period of a vertical synchronizing signal with a display position signal obtained during a blanking period of the vertical synchronizing signal;
• (b) separating the composite video signal into a reproduced video signal during the display period of the vertical synchronizing signal, and into a reproduced display position signal during the blanking period of the vertical synchronizing signal;
• (c) detecting a difference in phase between said reproduced display position signal and a horizontal synchronizing signal;
• (d) generating a timing adjusting signal for the horizontal synchronizing signal based upon the detected phase difference;
• (e) displaying the reproduced video signal on the display to form the image;
• and
• (f) adjusting the position of the image on the display in accordance with the timing adjusting signal.

A display control system for controlling the display of an image on a display, comprising:

• a display control circuit means for outputting a display position signal, a video signal, a vertical synchronizing signal and a horizontal synchronizing signal;
• a combining circuit means for receiving the video signal, the vertical synchronizing signal and the display position signal and for outputting a composite video signal, the composite video signal corresponding to the video signal when the vertical synchronizing signal is in a display period and corresponding to the display position signal when the vertical synchronizing signal is in a blanking period;
• and
• a display unit including
• separating means for receiving the composite video signal and for separating the composite video signal into a reproduced video signal during the display period of the vertical synchronizing signal and into a reproduced display position signal during the blanking period of the vertical synchronizing signal;
• a video control circuit means, coupled to the display, for receiving the reproduced video signal and for sourcing it to the display such that it is displayed to form the image;
• a vertical deflection circuit means, responsive to the vertical synchronization signal, for controlling vertical deflection of the display;
• a horizontal timing detection circuit means for receiving and detecting a difference in phase between the reproduced display position signal and the horizontal synchronizing signal, and for outputting a timing adjusting signal for said horizontal synchronizing signal based upon the detected phase difference;
• and
• a horizontal deflection circuit means, coupled to the display, for receiving the timing adjusting signal and for centering the image on the display based upon the timing adjusting signal.