Abstract: An aesthetically pleasing Lissajous figure is derived from a single signal source which feeds a common signal to both the horizontal and vertical deflection circuits of a cathode ray tube. Between the signal source and one or the other of said deflection circuits, a time delay is utilized to retard the transit of the signal to that deflection circuit. With a fixed frequency source, the Lissajous figure presented will be an ellipse whose eccentricity will be determined by the frequency of the signal output by said source. Where the signal source provides an output which randomly varies in frequency, the Lissajous figures presented will be reentrant in nature and of a character determined by the rate of change of frequency from said source and the magnitude of the time delay inserted in the selected deflection circuit. The invention lends itself to use with single or multiple gun CRT's and in either case may be used with monochromatic or polychromatic phosphorescent screens.

Abstract: A CRT system uses a time delay element in one deflection circuit to enable the production of reentrant Lissajous figures from signals derived from a single source. Its high voltage power supply operates at frequencies beyond the audio range and produces wave forms of low harmonic content at relatively low voltage levels thus providing quiet operation with little or no electromagnetic interference or x-ray emission problems. A secondary deflection yoke acting on the beam before the beam enters the effective region of the primary sweep deflection yoke enables control of the color tone of the image presented. Individual gain and timing controls produce variations in the display to satisfy the whim of the viewer. A gate-controlled blanking signal produces a stroboscopic effect at the display while a second form of intensity modulation produces scintillation of the displayed imagery.