Automated coherent clock synthesis for matrix display

A method for generating a clock signal for a matrix type display, from signals provided by a graphics source, comprising the steps of:

• providing a video output in the form of a plurality of video output signals associated with a raster type display, in which the video output signals define original images that are referenced to an input clock having a predetermined frequency and a predetermined phase;
• encoding at least one of the video output signals with clock information which define the frequency and the phase of the input clock to provide a clock-encoded video output signal;
• transmitting the clock-encoded video output signal to a display which includes a clock decoding circuit;
• supplying the clock-encoded video output signal to the clock decoding circuit and producing a replicated clock signal having said predetermined frequency and said predetermined phase;
• and
• supplying said replicated clock signal and said plurality of video output signals to said matrix type display and reproducing therewith said original images;
• providing an extraction and decoding circuit and producing therewith a reconstituted version of at least one of said video signals free of said clock information;
• and
• using a phase locked loop which is coupled to the reconstituted horizontal sync signal and which responds to another signal to produce the replicated clock signal;
• wherein the plurality of video output signals include RGB video signals, a vertical sync signal and a horizontal sync signal;
• and wherein the clock information is encoded within one signal period of the horizontal sync signal.