Beam-indexing picture display system

Claim 1

A BEAM-INDEXING COLOR TELEVISION DISPLAY SYSTEM COMPRISING A CATHODE RAY TUBE HAVING AN ELECTRON GUN FOR PRODUCING AN ELECTRON BEAM, SAID GUN HAVING A BEAM INTENSITY CONTROL ELECTRODE, AND A SCREEN DISPOSED IN THE PATH OF SAID BEAM, SAID SCREEN HAVING AN ITERATIVE PATTERN OF GROUPS OF AT LEAST TWO STRIPES OF MATERIAL LUMINESCENT AT DIFFERENT COLORS, MEANS FOR DEFLECTING SAID BEAM WHEREBY SAID BEAM SCANS SAID STRIPES IN A CONTINUOUS SEQUENCE, A SOURCE OF A SUBSTANTIALLY SINUSOIDAL COLOR SIGNAL HAVING AMPLITUDE AND PHASE-DEPENDENT UPON THE HUE AND SATURATION OF AN IMAGE TO BE DISPLAYED, SAID SINUSOIDAL SIGNAL HAVING A PERIOD EQUAL TO THE TIME SAID BEAM SCANS ONE GROUP OF SAID STRIPES, MEANS FOR GENERATING AT LEAST TWO SUBSTANTIALLY SINUSOIDAL PARTIAL INDEXING SIGNALS DURING THE TIME SAID BEAM SCANS EACH OF SAID GROUPS, MEANS FOR SHIFTING THE PHASE OF AT LEAST ONE OF SAID PARTIAL INDEXING SIGNALS WHEREBY SAID PARTIAL INDEXING SIGNALS ARE BROUGHT TO SUBSTANTIALLY THE SAME PHASE IN THE ABSENCE OF MODULATION OF SAID BEAM, MEANS FOR ADDING SAID IN-PHASE INDEXING SIGNALS TO PROVIDE A FINAL SUBSTANTIALLY SINUSOIDAL INDEXING SIGNAL, AND MEANS FOR CONTROLLING THE RELATIVE PHASE OF SAID FINAL INDEXING SIGNAL AND SAID COLOR SIGNAL.